fixes

ugh
simpler
2026-09-06 09:26:14 -07:00 · 2026-09-06 09:01:47 -07:00 · 2026-09-06 08:30:32 -07:00 · 2026-09-06 08:19:50 -07:00 · 2026-09-06 08:07:47 -07:00 · 2026-09-06 08:07:47 -07:00
318 changed files with 17268 additions and 8691 deletions
@@ -4,7 +4,7 @@ inputs:
  python-version:
    description: 'Python version to use'
    required: false
-    default: '' # if you don't set a version, the native python version will be used
+    default: '3.14'
  key:
    description: 'Key for the python cache'
    required: false
@@ -42,7 +42,11 @@ inputs:
    required: false
    default: 'false'
  qemu:
-    description: "Install qemu"
+    description: "Install qemu?"
+    required: false
+    default: 'false'
+  ninja:
+    description: "Install ninja?"
    required: false
    default: 'false'
 runs:
@@ -55,18 +59,18 @@ runs:
        echo "OMP_NUM_THREADS=1" >> "$GITHUB_ENV"
        # no buffers should be over 300MB in CI
        echo "MAX_BUFFER_SIZE=300000000" >> "$GITHUB_ENV"
+        if [[ "$RUNNER_OS" == "Linux" ]]; then
+          echo "VIRTUAL_ENV=/opt/venv/${{ inputs.python-version }}" >> "$GITHUB_ENV"
+          echo "UV_PYTHON_INSTALL_DIR=/opt/python" >> "$GITHUB_ENV"
+        else
+          echo "VIRTUAL_ENV=${{ github.workspace }}/.venv" >> "$GITHUB_ENV"
+        fi

    - name: Set up uv
      uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b
      with:
        enable-cache: 'false' # see below for manual caching

-    - name: Set up Python ${{ inputs.python-version }}
-      uses: actions/setup-python@v6
-      if: inputs.python-version != ''
-      with:
-        python-version: ${{ inputs.python-version }}
-
    # **** Caching packages ****

    - name: Cache Python packages (PR)
@@ -105,15 +109,15 @@ runs:
      if: inputs.deps != ''
      shell: bash
      run: |
-        uv venv .venv
+        uv venv --allow-existing --python ${{ inputs.python-version }} "$VIRTUAL_ENV"
        DEPS="${{ inputs.deps }}"
-        uv pip install --python .venv -e ".[${DEPS// /,}]" ${{ inputs.pydeps }} --torch-backend cpu --extra-index-url https://aiinfra.pkgs.visualstudio.com/PublicPackages/_packaging/Triton-Nightly/pypi/simple/
+        uv pip install --python "$VIRTUAL_ENV" -e ".[${DEPS// /,}]" ${{ inputs.pydeps }} --torch-backend cpu --extra-index-url https://aiinfra.pkgs.visualstudio.com/PublicPackages/_packaging/Triton-Nightly/pypi/simple/
    - name: Install dependencies in venv (without extra)
      if: inputs.deps == ''
      shell: bash
      run: |
-        uv venv .venv
-        uv pip install --python .venv -e . ${{ inputs.pydeps }}
+        uv venv --allow-existing --python ${{ inputs.python-version }} "$VIRTUAL_ENV"
+        uv pip install --python "$VIRTUAL_ENV" -e . ${{ inputs.pydeps }}
    - name: Prune uv cache
      if: github.event_name != 'pull_request'
      shell: bash
@@ -121,16 +125,15 @@ runs:
    - name: Configure venv
      shell: bash
      run: |
-        echo "VIRTUAL_ENV=${{ github.workspace }}/.venv" >> "$GITHUB_ENV"
        if [[ "$RUNNER_OS" == "Windows" ]]; then
-          echo "${{ github.workspace }}/.venv/Scripts" >> "$GITHUB_PATH"
+          echo "$VIRTUAL_ENV/Scripts" >> "$GITHUB_PATH"
        else
-          echo "${{ github.workspace }}/.venv/bin" >> "$GITHUB_PATH"
+          echo "$VIRTUAL_ENV/bin" >> "$GITHUB_PATH"
        fi

    # ******************* apt *******************
    - name: Setup apt
-      if: runner.os == 'Linux' && (inputs.opencl == 'true' || inputs.amd == 'true' || inputs.webgpu == 'true' || inputs.llvm == 'true' || inputs.qemu == 'true')
+      if: runner.os == 'Linux' && (inputs.opencl == 'true' || inputs.amd == 'true' || inputs.webgpu == 'true' || inputs.llvm == 'true' || inputs.qemu == 'true' || inputs.ninja == 'true')
      shell: bash
      run: |
        sudo mkdir -p /var/cache/apt/archives
@@ -158,7 +161,7 @@ runs:
        echo "deb http://apt.llvm.org/$(lsb_release -cs)/ llvm-toolchain-$(lsb_release -cs)-20 main" | sudo tee /etc/apt/sources.list.d/llvm.list

    - name: Compute Package List + Hash
-      if: runner.os == 'Linux' && (inputs.opencl == 'true' || inputs.amd == 'true' || inputs.webgpu == 'true' || inputs.llvm == 'true' || inputs.qemu == 'true')
+      if: runner.os == 'Linux' && (inputs.opencl == 'true' || inputs.amd == 'true' || inputs.webgpu == 'true' || inputs.llvm == 'true' || inputs.qemu == 'true' || inputs.ninja == 'true')
      id: apt-pkgs
      shell: bash
      run: |
@@ -183,25 +186,37 @@ runs:
        if [[ "${{ inputs.qemu }}" == "true" ]]; then
          pkgs+=" qemu-user-static"
        fi
+        # **** ninja ****
+        if [[ "${{ inputs.ninja }}" == "true" ]]; then
+          pkgs+=" ninja-build"
+        fi

        echo "pkgs=$pkgs" >> "$GITHUB_OUTPUT"
        echo "hash=$(echo -n "$pkgs" | sha256sum | cut -d' ' -f1)" >> "$GITHUB_OUTPUT"

+        installed=true
+        for pkg in $pkgs; do
+          info=$(dpkg-query -W -f='${db:Status-Abbrev} ${Version}' "$pkg" 2> /dev/null || true)
+          echo "${pkg}: ${info:-not in dpkg database}"
+          [[ "$info" == ii* ]] || installed=false
+        done
+        echo "installed=$installed" >> "$GITHUB_OUTPUT"
+
    - name: Cache apt (PR)
-      if: runner.os == 'Linux' && (inputs.opencl == 'true' || inputs.amd == 'true' || inputs.webgpu == 'true' || inputs.llvm == 'true' || inputs.qemu == 'true') && github.event_name == 'pull_request'
+      if: runner.os == 'Linux' && (inputs.opencl == 'true' || inputs.amd == 'true' || inputs.webgpu == 'true' || inputs.llvm == 'true' || inputs.qemu == 'true' || inputs.ninja == 'true') && github.event_name == 'pull_request' && steps.apt-pkgs.outputs.installed == 'false'
      uses: actions/cache/restore@v5
      with:
        path: /var/cache/apt/archives/
        key: ${{ runner.os }}-${{ runner.arch }}-apt-${{ steps.apt-pkgs.outputs.hash }}-${{ env.CACHE_VERSION }}
    - name: Cache apt
-      if: runner.os == 'Linux' && (inputs.opencl == 'true' || inputs.amd == 'true' || inputs.webgpu == 'true' || inputs.llvm == 'true' || inputs.qemu == 'true') && github.event_name != 'pull_request'
+      if: runner.os == 'Linux' && (inputs.opencl == 'true' || inputs.amd == 'true' || inputs.webgpu == 'true' || inputs.llvm == 'true' || inputs.qemu == 'true' || inputs.ninja == 'true') && github.event_name != 'pull_request' && steps.apt-pkgs.outputs.installed == 'false'
      uses: actions/cache@v5
      with:
        path: /var/cache/apt/archives/
        key: ${{ runner.os }}-${{ runner.arch }}-apt-${{ steps.apt-pkgs.outputs.hash }}-${{ env.CACHE_VERSION }}

    - name: Run apt Update + Install
-      if: runner.os == 'Linux' && (inputs.opencl == 'true' || inputs.amd == 'true' || inputs.webgpu == 'true' || inputs.llvm == 'true' || inputs.qemu == 'true')
+      if: runner.os == 'Linux' && (inputs.opencl == 'true' || inputs.amd == 'true' || inputs.webgpu == 'true' || inputs.llvm == 'true' || inputs.qemu == 'true' || inputs.ninja == 'true') && steps.apt-pkgs.outputs.installed == 'false'
      shell: bash
      run: |
        sudo apt -qq update || true
@@ -35,15 +35,15 @@ jobs:
        key: 'autogen'
        amd: 'true'
        llvm: 'true'
-        pydeps: 'pyyaml mako'
+        deps: 'autogen'
    - name: Install autogen support packages
      run: sudo apt-get install -y --no-install-recommends libclang-20-dev llvm-20-dev hip-dev libusb-1.0-0-dev libdrm-dev liburing-dev
    - name: Regenerate autogen files
      run: |
-        find tinygrad/runtime/autogen -type f -name "*.py" -not -path "*/amd/*" -not -name "__init__.py" -not -name "comgr.py" -not -name "metal.py" -not -name "iokit.py" -not -name "corefoundation.py" -not -name "libclang.py" -delete
+        find tinygrad/runtime/autogen -type f -name "*.py" -not -path "*/amd/*" -not -name "__init__.py" -not -name "metal.py" -not -name "iokit.py" -not -name "corefoundation.py" -not -name "libclang.py" -delete
        python3 -c "from tinygrad.runtime.autogen import opencl"
        python3 -c "from tinygrad.runtime.autogen import cuda, nvrtc, nvjitlink, nv_570, nv_580, nv_610, nv"
-        python3 -c "from tinygrad.runtime.autogen import comgr_3, hsa, hip, amd_gpu, sqtt, rocprof, amdgpu_kd, amdgpu_drm"
+        python3 -c "from tinygrad.runtime.autogen import comgr, comgr_3, hsa, hip, amd_gpu, sqtt, rocprof, amdgpu_kd, amdgpu_drm"
        python3 -c "from tinygrad.runtime.autogen.am import *"
        python3 -c "from tinygrad.runtime.autogen.nv_regs import *"
        python3 -c "from tinygrad.runtime.autogen import libc, kfd, io_uring, pci, vfio"
@@ -54,7 +54,7 @@ jobs:
        python3 -c "from tinygrad.runtime.autogen import mesa"
        python3 -c "from tinygrad.runtime.autogen import avcodec"
        python3 -c "from tinygrad.runtime.autogen import llvm_qcom"
-        python3 -c "from tinygrad.runtime.autogen import mlx5"
+        python3 -c "from tinygrad.runtime.autogen import mlx5, bnxt"
        python3 -c "from tinygrad.runtime.autogen import ggml_common"
        REGEN=1 python3 -c "from tinygrad.runtime.autogen import libclang"
    - name: Check for differences
@@ -102,42 +102,3 @@ jobs:
      with:
        name: autogen-macos-patch
        path: autogen-macos.patch
-
-  autogen-comgr-2:
-    name: In-tree Autogen (comgr 2)
-    runs-on: ubuntu-24.04
-    timeout-minutes: 15
-    steps:
-    - name: Checkout Code
-      uses: actions/checkout@v6
-    - name: Setup Environment
-      uses: ./.github/actions/setup-tinygrad
-      with:
-        key: 'autogen-comgr'
-    - name: Install autogen support packages
-      run: |
-        wget https://repo.radeon.com/rocm/rocm.gpg.key -O - | gpg --dearmor | sudo tee /etc/apt/keyrings/rocm.gpg > /dev/null
-        sudo tee /etc/apt/sources.list.d/rocm.list <<EOF
-        deb [arch=amd64 signed-by=/etc/apt/keyrings/rocm.gpg] https://repo.radeon.com/rocm/apt/6.2 $(lsb_release -cs) main
-        EOF
-        echo -e 'Package: *\nPin: release o=repo.radeon.com\nPin-Priority: 600' | sudo tee /etc/apt/preferences.d/rocm-pin-600
-        sudo apt -qq update || true
-        sudo apt-get install -y --no-install-recommends libclang-20-dev comgr
-    - name: Regenerate autogen files
-      run: |
-        rm tinygrad/runtime/autogen/comgr.py
-        python3 -c "from tinygrad.runtime.autogen import comgr"
-    - name: Check for differences
-      run: |
-        if ! git diff --quiet; then
-          git diff
-          git diff > autogen-comgr2.patch
-          echo "Autogen mismatch detected. Patch available at: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}#artifacts"
-          exit 1
-        fi
-    - name: Upload patch artifact
-      if: failure()
-      uses: actions/upload-artifact@v7
-      with:
-        name: autogen-comgr2-patch
-        path: autogen-comgr2.patch
@@ -82,19 +82,22 @@ jobs:
  #      pytest -nauto --durations=20

  llmbenchmark:
-    name: LLM (DEV=${{ matrix.dev }})
+    name: Benchmark ${{ matrix.model }} (DEV=${{ matrix.dev }})
    runs-on: [self-hosted, "${{ matrix.dev == 'METAL' && 'macOS' || matrix.dev == 'AMD' && 'tinybox' || 'tinyboxgreen' }}"]
    strategy:
      fail-fast: false
      matrix:
        dev: ['METAL', 'AMD', 'NV']
-    timeout-minutes: 60
+        model: ['llama3.2:3b-f16', 'qwen3.8:27b', 'olmoe']
+        # qwen3.8:27b doesn't fit on mac
+        exclude: [{ dev: 'METAL', model: 'qwen3.8:27b' }, { dev: 'AMD', model: 'olmoe' }, { dev: 'NV', model: 'olmoe' }]
+    timeout-minutes: 15
    defaults:
      run:
        shell: bash -e -o pipefail {0}
    env:
      DEV: ${{ matrix.dev }}
-      HCQ2: ${{ matrix.dev == 'AMD' && '1' || '0' }}
+      HCQ2: '0'
    if: github.repository_owner == 'tinygrad'
    steps:
    - name: Checkout Code
@@ -102,16 +105,11 @@ jobs:
    - name: Setup (AMD)
      if: ${{ matrix.dev == 'AMD' }}
      run: |
-        ./extra/amdpci/setup_python_cap.sh
-        ./extra/hcq/hcq_smi.py amd rmmod
-        ./extra/hcq/hcq_smi.py amd kill_pids
+        ./extra/hcq/hcq_smi.py amd rmmod --expect
+        ./extra/hcq/hcq_smi.py amd kill_pids --sudoless
    - name: Setup (NV)
      if: ${{ matrix.dev == 'NV' }}
-      run: sudo lsof -tQ /dev/nvidia* | { xargs -r sudo kill -9 || true; }
-    - name: Symlink models and datasets
-      run: |
-        mkdir -p weights
-        ln -s /raid/weights/LLaMA-3 weights/LLaMA-3
+      run: lsof -tQ /dev/nvidia* | { xargs -r kill -9 || true; }
    - name: setup staging db
      if: github.ref == 'refs/heads/update_benchmark_staging'
      run: |
@@ -119,20 +117,10 @@ jobs:
        rm -f /tmp/staging.db /tmp/staging.db-shm /tmp/staging.db-wal
    - name: reset process replay
      run: python3 test/external/process_replay/reset.py
-    - name: Run llama3.2
-      run: BENCHMARK_LOG=llama32_3b-f16 JITBEAM=2 IGNORE_BEAM_CACHE=1 python3 -m tinygrad.llm -m llama3.2:3b-f16 --benchmark --warmup
-    - name: Run qwen3.6
-      # qwen3.6:35b-a3b doesn't fit on mac
-      if: ${{ matrix.dev != 'METAL' }}
-      run: BENCHMARK_LOG=qwen36_35b-a3b JITBEAM=2 IGNORE_BEAM_CACHE=1 python3 -m tinygrad.llm -m qwen3.6:35b-a3b --benchmark --warmup
-    - name: Run olmoe
-      # just metal for now
-      if: ${{ matrix.dev == 'METAL' }}
-      run: BENCHMARK_LOG=olmoe JITBEAM=2 IGNORE_BEAM_CACHE=1 python3 -m tinygrad.llm -m olmoe --benchmark --warmup
-    - name: Run LLaMA-3 8B on 4 GPUs with BEAM
-      # only run on machines with multiple gpus
-      if: ${{ matrix.dev != 'METAL' }}
-      run: BENCHMARK_LOG=llama3_beam_4gpu JITBEAM=2 IGNORE_BEAM_CACHE=1 CAPTURE_PROCESS_REPLAY=0 python3 examples/llama3.py --size 8B --shard 4 --model weights/LLaMA-3/8B-SF-DPO/ --benchmark --temperature 0
+    - name: Run ${{ matrix.model }}
+      run: |
+        MODEL=${{ matrix.model }}
+        BENCHMARK_LOG=${MODEL//./} JITBEAM=2 IGNORE_BEAM_CACHE=1 python3 -m tinygrad.llm -m $MODEL --benchmark --warmup
    - name: Run process replay tests
      uses: ./.github/actions/process-replay

@@ -143,13 +131,13 @@ jobs:
      fail-fast: false
      matrix:
        dev: ['METAL', 'AMD', 'NV']
-    timeout-minutes: 60
+    timeout-minutes: 10
    defaults:
      run:
        shell: bash -e -o pipefail {0}
    env:
      DEV: ${{ matrix.dev }}
-      HCQ2: ${{ matrix.dev == 'AMD' && '1' || '0' }}
+      HCQ2: '0'
    if: github.repository_owner == 'tinygrad'
    steps:
    - name: Checkout Code
@@ -157,12 +145,11 @@ jobs:
    - name: Setup (AMD)
      if: ${{ matrix.dev == 'AMD' }}
      run: |
-        ./extra/amdpci/setup_python_cap.sh
-        ./extra/hcq/hcq_smi.py amd rmmod
-        ./extra/hcq/hcq_smi.py amd kill_pids
+        ./extra/hcq/hcq_smi.py amd rmmod --expect
+        ./extra/hcq/hcq_smi.py amd kill_pids --sudoless
    - name: Setup (NV)
      if: ${{ matrix.dev == 'NV' }}
-      run: sudo lsof -tQ /dev/nvidia* | { xargs -r sudo kill -9 || true; }
+      run: lsof -tQ /dev/nvidia* | { xargs -r kill -9 || true; }
    - name: setup staging db
      if: github.ref == 'refs/heads/update_benchmark_staging'
      run: |
@@ -182,10 +169,6 @@ jobs:
      # slow on metal
      if: ${{ matrix.dev != 'METAL' }}
      run: time BENCHMARK_LOG=cifar DEFAULT_FLOAT=HALF STEPS=1000 TARGET_EVAL_ACC_PCT=93.0 python3 examples/hlb_cifar10.py
-    - name: Run full CIFAR training steps w 6 GPUS
-      # only run on machines with multiple gpus
-      if: ${{ matrix.dev != 'METAL' }}
-      run: time BENCHMARK_LOG=cifar_6gpu CAPTURE_PROCESS_REPLAY=0 DEFAULT_FLOAT=HALF STEPS=350 BS=1536 GPUS=6 TARGET_EVAL_ACC_PCT=93.0 python3 examples/hlb_cifar10.py
    - name: Run process replay tests
      uses: ./.github/actions/process-replay

@@ -196,13 +179,13 @@ jobs:
      fail-fast: false
      matrix:
        dev: ['AMD', 'NV']
-    timeout-minutes: 60
+    timeout-minutes: 5
    defaults:
      run:
        shell: bash -e -o pipefail {0}
    env:
      DEV: ${{ matrix.dev }}
-      HCQ2: ${{ matrix.dev == 'AMD' && '1' || '0' }}
+      HCQ2: '0'
    if: github.repository_owner == 'tinygrad'
    steps:
    - name: Checkout Code
@@ -210,12 +193,11 @@ jobs:
    - name: Setup (AMD)
      if: ${{ matrix.dev == 'AMD' }}
      run: |
-        ./extra/amdpci/setup_python_cap.sh
-        ./extra/hcq/hcq_smi.py amd rmmod
-        ./extra/hcq/hcq_smi.py amd kill_pids
+        ./extra/hcq/hcq_smi.py amd rmmod --expect
+        ./extra/hcq/hcq_smi.py amd kill_pids --sudoless
    - name: Setup (NV)
      if: ${{ matrix.dev == 'NV' }}
-      run: sudo lsof -tQ /dev/nvidia* | { xargs -r sudo kill -9 || true; }
+      run: lsof -tQ /dev/nvidia* | { xargs -r kill -9 || true; }
    - name: Symlink models and datasets
      run: |
        mkdir -p extra/datasets
@@ -227,15 +209,8 @@ jobs:
        rm -f /tmp/staging.db /tmp/staging.db-shm /tmp/staging.db-wal
    - name: reset process replay
      run: test/external/process_replay/reset.py
-    - name: Run MLPerf resnet eval on training data
-      run: time BENCHMARK_LOG=resnet_eval MODEL=resnet python3 examples/mlperf/model_eval.py
    - name: Run 10 MLPerf ResNet50 training steps (1 gpu)
      run: BENCHMARK_LOG=resnet_10steps DEFAULT_FLOAT=HALF BENCHMARK=10 BS=256 GPUS=1 MODEL=resnet python3 examples/mlperf/model_train.py
-    - name: Run 10 MLPerf ResNet50 training steps (6 gpu)
-      run: BENCHMARK_LOG=resnet_10steps_6gpu CAPTURE_PROCESS_REPLAY=0 DEFAULT_FLOAT=HALF BENCHMARK=10 BS=1536 GPUS=6 MODEL=resnet python3 examples/mlperf/model_train.py
-    - name: Run 10 MLPerf Bert training steps (6 gpu)
-      # TODO: remove BERT_LAYERS once scheduler is fast
-      run: BENCHMARK_LOG=bert_10steps_6gpu CAPTURE_PROCESS_REPLAY=0 DEFAULT_FLOAT=HALF BENCHMARK=10 BS=72 GPUS=6 BERT_LAYERS=2 MODEL=bert python3 examples/mlperf/model_train.py
    - name: Run process replay tests
      uses: ./.github/actions/process-replay

@@ -246,13 +221,13 @@ jobs:
      fail-fast: false
      matrix:
        dev: ['METAL', 'AMD', 'NV']
-    timeout-minutes: 60
+    timeout-minutes: 15
    defaults:
      run:
        shell: bash -e -o pipefail {0}
    env:
      DEV: ${{ matrix.dev }}
-      HCQ2: ${{ matrix.dev == 'AMD' && '1' || '0' }}
+      HCQ2: '0'
    if: github.repository_owner == 'tinygrad'
    steps:
    - name: Checkout Code
@@ -260,12 +235,11 @@ jobs:
    - name: Setup (AMD)
      if: ${{ matrix.dev == 'AMD' }}
      run: |
-        ./extra/amdpci/setup_python_cap.sh
-        ./extra/hcq/hcq_smi.py amd rmmod
-        ./extra/hcq/hcq_smi.py amd kill_pids
+        ./extra/hcq/hcq_smi.py amd rmmod --expect
+        ./extra/hcq/hcq_smi.py amd kill_pids --sudoless
    - name: Setup (NV)
      if: ${{ matrix.dev == 'NV' }}
-      run: sudo lsof -tQ /dev/nvidia* | { xargs -r sudo kill -9 || true; }
+      run: lsof -tQ /dev/nvidia* | { xargs -r kill -9 || true; }
    - name: setup staging db
      if: github.ref == 'refs/heads/update_benchmark_staging'
      run: |
@@ -285,6 +259,59 @@ jobs:
    - name: Run process replay tests
      uses: ./.github/actions/process-replay

+  multigpubenchmark:
+    name: Multi-GPU Benchmarks (DEV=${{ matrix.dev }})
+    runs-on: [self-hosted, "${{ matrix.dev == 'AMD' && 'tinybox' || 'tinyboxgreen' }}"]
+    strategy:
+      fail-fast: false
+      matrix:
+        dev: ['AMD', 'NV']
+    timeout-minutes: 20
+    defaults:
+      run:
+        shell: bash -e -o pipefail {0}
+    env:
+      DEV: ${{ matrix.dev }}
+      HCQ2: '0'
+    if: github.repository_owner == 'tinygrad'
+    steps:
+    - name: Checkout Code
+      uses: actions/checkout@v6
+    - name: Setup (AMD)
+      if: ${{ matrix.dev == 'AMD' }}
+      run: |
+        ./extra/hcq/hcq_smi.py amd rmmod --expect
+        ./extra/hcq/hcq_smi.py amd kill_pids --sudoless
+    - name: Setup (NV)
+      if: ${{ matrix.dev == 'NV' }}
+      run: lsof -tQ /dev/nvidia* | { xargs -r kill -9 || true; }
+    - name: Symlink models and datasets
+      run: |
+        mkdir -p weights
+        mkdir -p extra/datasets
+        ln -s /raid/weights/LLaMA-3 weights/LLaMA-3
+        ln -s /raid/datasets/imagenet extra/datasets/imagenet
+    - name: setup staging db
+      if: github.ref == 'refs/heads/update_benchmark_staging'
+      run: |
+        echo "CACHEDB=/tmp/staging.db" >> $GITHUB_ENV
+        rm -f /tmp/staging.db /tmp/staging.db-shm /tmp/staging.db-wal
+    - name: reset process replay
+      run: python3 test/external/process_replay/reset.py
+    - name: Run LLaMA-3 8B on 4 GPUs with BEAM
+      run: BENCHMARK_LOG=llama3_beam_4gpu JITBEAM=2 IGNORE_BEAM_CACHE=1 CAPTURE_PROCESS_REPLAY=0 python3 examples/llama3.py --size 8B --shard 4 --model weights/LLaMA-3/8B-SF-DPO/ --benchmark --temperature 0
+    - name: Run full CIFAR training steps w 6 GPUS
+      run: time BENCHMARK_LOG=cifar_6gpu CAPTURE_PROCESS_REPLAY=0 DEFAULT_FLOAT=HALF STEPS=350 BS=1536 GPUS=6 TARGET_EVAL_ACC_PCT=93.0 python3 examples/hlb_cifar10.py
+    - name: Run MLPerf resnet eval on training data
+      run: time BENCHMARK_LOG=resnet_eval MODEL=resnet python3 examples/mlperf/model_eval.py
+    - name: Run 10 MLPerf ResNet50 training steps (6 gpu)
+      run: BENCHMARK_LOG=resnet_10steps_6gpu CAPTURE_PROCESS_REPLAY=0 DEFAULT_FLOAT=HALF BENCHMARK=10 BS=1536 GPUS=6 MODEL=resnet python3 examples/mlperf/model_train.py
+    - name: Run 10 MLPerf Bert training steps (6 gpu)
+      # TODO: remove BERT_LAYERS once scheduler is fast
+      run: BENCHMARK_LOG=bert_10steps_6gpu CAPTURE_PROCESS_REPLAY=0 DEFAULT_FLOAT=HALF BENCHMARK=10 BS=72 GPUS=6 BERT_LAYERS=2 MODEL=bert python3 examples/mlperf/model_train.py
+    - name: Run process replay tests
+      uses: ./.github/actions/process-replay
+
  tests:
    name: Tests (DEV=${{ matrix.dev }})
    runs-on: [self-hosted, "${{ matrix.dev == 'METAL' && 'macOS' || matrix.dev == 'AMD' && 'tinybox' || 'tinyboxgreen' }}"]
@@ -292,7 +319,7 @@ jobs:
      fail-fast: false
      matrix:
        dev: ['METAL', 'AMD', 'NV']
-    timeout-minutes: 60
+    timeout-minutes: 11
    defaults:
      run:
        shell: bash -e -o pipefail {0}
@@ -305,12 +332,11 @@ jobs:
    - name: Setup (AMD)
      if: ${{ matrix.dev == 'AMD' }}
      run: |
-        ./extra/amdpci/setup_python_cap.sh
-        ./extra/hcq/hcq_smi.py amd rmmod
-        ./extra/hcq/hcq_smi.py amd kill_pids
+        ./extra/hcq/hcq_smi.py amd rmmod --expect
+        ./extra/hcq/hcq_smi.py amd kill_pids --sudoless
    - name: Setup (NV)
      if: ${{ matrix.dev == 'NV' }}
-      run: sudo lsof -tQ /dev/nvidia* | { xargs -r sudo kill -9 || true; }
+      run: lsof -tQ /dev/nvidia* | { xargs -r kill -9 || true; }
    - name: setup staging db
      if: github.ref == 'refs/heads/update_benchmark_staging'
      run: |
@@ -372,9 +398,10 @@ jobs:
    - name: Test benchmark allreduce
      if: ${{ matrix.dev == 'NV' }}
      run: python test/external/external_benchmark_multitensor_allreduce.py
-    - name: HEVC Decode Benchmark
-      if: ${{ matrix.dev == 'NV' }}
-      run: VALIDATE=1 MAX_FRAMES=100 ASSERT_FPS=1400 JITBEAM=1 PYTHONPATH=. python3 extra/hevc/decode.py
+    # TODO: HEVC decode timing test
+    # - name: HEVC Decode Benchmark
+    #   if: ${{ matrix.dev == 'NV' }}
+    #   run: IGNORE_BEAM_CACHE=1 VALIDATE=1 MAX_FRAMES=100 ASSERT_FPS=1400 JITBEAM=1 PYTHONPATH=. python3 extra/hevc/decode.py
    - uses: actions/upload-artifact@v7
      if: ${{ matrix.dev != 'AMD' }}
      with:
@@ -387,7 +414,7 @@ jobs:
  testusbgpu:
    name: UsbGPU Benchmark
    runs-on: [self-hosted, macOS]
-    timeout-minutes: 10
+    timeout-minutes: 3
    defaults:
      run:
        shell: bash -e -o pipefail {0}
@@ -402,32 +429,64 @@ jobs:
        rm -f /tmp/staging.db /tmp/staging.db-shm /tmp/staging.db-wal
    - name: Kill stale pids
      run: |
-        PYTHONPATH=. ./extra/hcq/hcq_smi.py amd kill_pids
-        PYTHONPATH=. ./extra/hcq/hcq_smi.py nv kill_pids
-    # since sudo is required for usbgpu on macos, do not write bytecode, as some of the files are owned by root
+        ./extra/hcq/hcq_smi.py amd kill_pids --sudoless
+        ./extra/hcq/hcq_smi.py nv kill_pids --sudoless
    - name: UsbGPU boot time
-      run: sudo -E PYTHONDONTWRITEBYTECODE=1 PYTHONPATH=. GMMU=0 DEBUG=2 AM_RESET=1 DEV=USB+AMD time python3.11 test/test_tiny.py TestTiny.test_plus
+      run: GMMU=0 DEBUG=2 AM_RESET=1 DEV=USB+AMD time python3.11 test/test_tiny.py TestTiny.test_plus
    - name: UsbGPU tiny tests
-      run: sudo -E PYTHONDONTWRITEBYTECODE=1 PYTHONPATH=. GMMU=0 DEV=USB+AMD python3.11 test/test_tiny.py
+      run: GMMU=0 DEV=USB+AMD python3.11 test/test_tiny.py
    - name: UsbGPU copy speeds
-      run: sudo -E PYTHONDONTWRITEBYTECODE=1 PYTHONPATH=. GMMU=0 DEV=USB+AMD python3.11 test/external/external_test_usb_asm24.py TestDevCopySpeeds
-    #- name: UsbGPU openpilot test
-    #  run: sudo -E PYTHONPATH=. GMMU=0 DEV=USB+AMD GRAPH_ONE_KERNEL=1 python3.11 examples/openpilot/compile3.py https://github.com/commaai/openpilot/raw/9118973ed03c1ae1d40cf69a29507ec2cc78efd7/selfdrive/modeld/models/supercombo.onnx
-    - name: UsbGPU (USB4/TB) install script
-      run: PYTHONPATH=. sh extra/setup_tinygpu_osx.sh
-    - name: UsbGPU (USB4/TB) boot time
-      run: PYTHONPATH=. DEBUG=3 DEV=PCI+NV:NAK time python3.11 test/test_tiny.py TestTiny.test_plus
-    - name: UsbGPU (USB4/TB) tiny tests
-      run: PYTHONPATH=. DEV=PCI+NV:NAK python3.11 test/test_tiny.py
+      run: SIZE=64000000 PYTHONPATH=. GMMU=0 DEV=USB+AMD python3.11 test/external/external_test_usb_asm24.py

-  testcommalatest:
-    name: comma Benchmark (0.11.2)
-    runs-on: [self-hosted, Linux, comma]
-    timeout-minutes: 12
+  testcomma:
+    strategy:
+      matrix:
+        dev: ['QCOM', 'QCOM:IR3']
+        version: ['0.11.0', '0.11.2']
+        model: ['vision', 'policy', 'supercombo', 'dmonitoring']
+        # exclude non-existent models
+        exclude: [{ version: '0.11.0', model: supercombo }, { version: '0.11.2', model: vision }, { version: '0.11.2', model: policy }]
+        include:
+          - version: '0.11.0'
+            model: vision
+            url: https://github.com/commaai/openpilot/raw/v0.11.0/selfdrive/modeld/models/driving_vision.onnx
+            timing: 18
+          - version: '0.11.0'
+            model: policy
+            url: https://github.com/commaai/openpilot/raw/v0.11.0/selfdrive/modeld/models/driving_policy.onnx
+            timing: 3.4
+          - version: '0.11.0'
+            model: dmonitoring
+            url: https://github.com/commaai/openpilot/raw/v0.11.0/selfdrive/modeld/models/dmonitoring_model.onnx
+            timing: 13
+          - version: '0.11.2'
+            model: supercombo
+            url: https://gitlab.com/commaai/openpilot-lfs.git/gitlab-lfs/objects/433f85f956837606ad1f1cbee4aa7e2158ad23c768dea914b20436c97232741b
+            timing: 28
+          - dev: QCOM:IR3
+            version: '0.11.2'
+            model: supercombo
+            timing: 29
+          - version: '0.11.2'
+            model: dmonitoring
+            url: https://gitlab.com/commaai/openpilot-lfs.git/gitlab-lfs/objects/3e7b31dfbc0a5234f1baf196513b77fc6af12204b8a8ffe8ee0417e48352f316
+            timing: 12.5
+          # IR3 dmonitoring is slightly slower
+          - dev: QCOM:IR3
+            model: dmonitoring
+            timing: 13.0
+      fail-fast: false
+    name: openpilot ${{ matrix.version }} compile3 ${{ matrix.model }} (DEV=${{ matrix.dev }})
+    runs-on: [self-hosted, Linux, comma4]
+    timeout-minutes: 5
    defaults:
      run:
        shell: bash -e -o pipefail {0}
    if: github.repository_owner == 'tinygrad'
+    env:
+      DEV: ${{ matrix.dev }}
+      ASSERT_MIN_STEP_TIME: ${{ matrix.timing }}
+      BENCHMARK_LOG: ${{ matrix.dev == 'QCOM:IR3' && 'ir3_' || '' }}openpilot_${{ matrix.version }}_${{ matrix.model }}
    steps:
    - name: Checkout Code
      uses: actions/checkout@v6
@@ -438,45 +497,10 @@ jobs:
        rm -f /tmp/staging.db /tmp/staging.db-shm /tmp/staging.db-wal
    - name: reset process replay
      run: test/external/process_replay/reset.py
-    - name: openpilot compile3 0.11.2 supercombo
-      run: BENCHMARK_LOG=openpilot_0_11_2_supercombo PYTHONPATH="." ASSERT_MIN_STEP_TIME=26 DEV=QCOM FLOAT16=1 IMAGE=1 NOLOCALS=1 taskset -c 4-7 python3 examples/openpilot/compile3.py https://gitlab.com/commaai/openpilot-lfs.git/gitlab-lfs/objects/433f85f956837606ad1f1cbee4aa7e2158ad23c768dea914b20436c97232741b
-    - name: openpilot compile3 0.11.2 supercombo (from pickle)
-      run: BENCHMARK_LOG=openpilot_0_11_2_supercombo_run_pickle RUN_PICKLE=1 PYTHONPATH="." ASSERT_MIN_STEP_TIME=26 DEV=QCOM taskset -c 4-7 python3 examples/openpilot/compile3.py
-    - name: IR3 openpilot compile3 0.11.2 supercombo
-      run: BENCHMARK_LOG=ir3_openpilot_0_11_2_supercombo PYTHONPATH="." ASSERT_MIN_STEP_TIME=41 DEV=QCOM:IR3 FLOAT16=1 IMAGE=1 NOLOCALS=1 taskset -c 4-7 python3 examples/openpilot/compile3.py https://gitlab.com/commaai/openpilot-lfs.git/gitlab-lfs/objects/433f85f956837606ad1f1cbee4aa7e2158ad23c768dea914b20436c97232741b
-    - name: openpilot compile3 0.11.2 dmonitoring
-      run: BENCHMARK_LOG=openpilot_0_11_2_dmonitoring PYTHONPATH="." ASSERT_MIN_STEP_TIME=11 DEV=QCOM FLOAT16=1 IMAGE=1 NOLOCALS=1 taskset -c 4-7 python3 examples/openpilot/compile3.py https://gitlab.com/commaai/openpilot-lfs.git/gitlab-lfs/objects/3e7b31dfbc0a5234f1baf196513b77fc6af12204b8a8ffe8ee0417e48352f316
-    - name: Run process replay tests
-      uses: ./.github/actions/process-replay
-
-  testcommaold:
-    name: comma Benchmark (0.11.0)
-    runs-on: [self-hosted, Linux, comma]
-    timeout-minutes: 12
-    defaults:
-      run:
-        shell: bash -e -o pipefail {0}
-    if: github.repository_owner == 'tinygrad'
-    steps:
-    - name: Checkout Code
-      uses: actions/checkout@v6
-    - name: setup staging db
-      if: github.ref == 'refs/heads/update_benchmark_staging'
-      run: |
-        echo "CACHEDB=/tmp/staging.db" >> $GITHUB_ENV
-        rm -f /tmp/staging.db /tmp/staging.db-shm /tmp/staging.db-wal
-    - name: reset process replay
-      run: test/external/process_replay/reset.py
-    - name: openpilot compile3 0.11.0 driving_vision
-      run: BENCHMARK_LOG=openpilot_0_11_0_vision PYTHONPATH="." ASSERT_MIN_STEP_TIME=17 DEV=QCOM FLOAT16=1 IMAGE=1 NOLOCALS=1 taskset -c 4-7 python3 examples/openpilot/compile3.py https://github.com/commaai/openpilot/raw/v0.11.0/selfdrive/modeld/models/driving_vision.onnx
-    - name: openpilot compile3 0.11.0 driving_vision (from pickle)
-      run: BENCHMARK_LOG=openpilot_0_11_0_vision_run_pickle RUN_PICKLE=1 PYTHONPATH="." ASSERT_MIN_STEP_TIME=17 DEV=QCOM taskset -c 4-7 python3 examples/openpilot/compile3.py
-    - name: IR3 openpilot compile3 0.11.0 driving_vision
-      run: BENCHMARK_LOG=ir3_openpilot_0_11_0_vision PYTHONPATH="." ASSERT_MIN_STEP_TIME=18 DEV=QCOM:IR3 FLOAT16=1 IMAGE=1 NOLOCALS=1 taskset -c 4-7 python3 examples/openpilot/compile3.py https://github.com/commaai/openpilot/raw/v0.11.0/selfdrive/modeld/models/driving_vision.onnx
-    - name: openpilot compile3 0.11.0 driving_policy
-      run: BENCHMARK_LOG=openpilot_0_11_0_policy PYTHONPATH="." ASSERT_MIN_STEP_TIME=3.2 DEV=QCOM FLOAT16=1 IMAGE=1 NOLOCALS=1 taskset -c 4-7 python3 examples/openpilot/compile3.py https://github.com/commaai/openpilot/raw/v0.11.0/selfdrive/modeld/models/driving_policy.onnx
-    - name: openpilot compile3 0.11.0 dmonitoring
-      run: BENCHMARK_LOG=openpilot_0_11_0_dmonitoring PYTHONPATH="." ASSERT_MIN_STEP_TIME=11 DEV=QCOM FLOAT16=1 IMAGE=1 NOLOCALS=1 taskset -c 4-7 python3 examples/openpilot/compile3.py https://github.com/commaai/openpilot/raw/v0.11.0/selfdrive/modeld/models/dmonitoring_model.onnx
+    - name: compile
+      run: FLOAT16=1 IMAGE=1 taskset -c 4-7 python3 examples/openpilot/compile3.py ${{ matrix.url }} openpilot.pkl
+    - name: run pickle
+      run: BENCHMARK_LOG="${BENCHMARK_LOG}_run_pickle" RUN_PICKLE=1 taskset -c 4-7 python3 examples/openpilot/compile3.py - openpilot.pkl
    - name: Run process replay tests
      uses: ./.github/actions/process-replay

@@ -489,15 +513,6 @@ jobs:
        shell: bash -e -o pipefail {0}
    if: github.repository_owner == 'tinygrad'
    steps:
-    - name: Checkout Code
-      uses: actions/checkout@v6
-    - name: setup staging db
-      if: github.ref == 'refs/heads/update_benchmark_staging'
-      run: |
-        echo "CACHEDB=/tmp/staging.db" >> $GITHUB_ENV
-        rm -f /tmp/staging.db /tmp/staging.db-shm /tmp/staging.db-wal
-    - name: reset process replay
-      run: test/external/process_replay/reset.py
    - name: Checkout Code
      uses: actions/checkout@v6
    - name: setup staging db
@@ -510,8 +525,8 @@ jobs:
    - name: benchmark MobileNetV2 on DSP
      run: |
        # generate quantized weights
-        ln -s /data/home/tiny/tinygrad/extra/datasets/imagenet extra/datasets/imagenet
-        ln -s /data/home/tiny/tinygrad/testsig-*.so .
+        ln -s ~/tinygrad/extra/datasets/imagenet extra/datasets/imagenet
+        ln -s ~/tinygrad/testsig-*.so .
        PYTHONPATH=. DEV=CPU QUANT=1 CNT=0 python3 examples/test_onnx_imagenet.py https://github.com/xamcat/mobcat-samples/raw/refs/heads/master/onnx_runtime/InferencingSample/InferencingSample/mobilenetv2-7.onnx /tmp/model.quant.onnx
        # benchmark on DSP with NOOPT=1, the devectorizer has issues
        PYTHONPATH=. DEV=DSP NOOPT=1 CNT=2 DEBUG=2 python3 examples/test_onnx_imagenet.py /tmp/model.quant.onnx
@@ -521,7 +536,7 @@ jobs:
  testcommausbgpubenchmark:
    name: UsbGPU Benchmark (comma)
    runs-on: [self-hosted, Linux, comma4]
-    timeout-minutes: 20
+    timeout-minutes: 10
    defaults:
      run:
        shell: bash -e -o pipefail {0}
@@ -541,7 +556,7 @@ jobs:
    - name: openpilot run_pickle big_driving_supercombo
      run: BENCHMARK_LOG=usbgpu_openpilot_big_driving_supercombo_run_pickle RUN_PICKLE=1 PICKLE_OOB=1 PYTHONPATH="." GMMU=0 DEV=USB+AMD ASSERT_MIN_STEP_TIME=50 python3 examples/openpilot/compile3.py - openpilot.pkl
    - name: Test copy speeds
-      run: SIZE=64e6 PYTHONPATH=. GMMU=0 DEV=USB+AMD python3 test/external/external_test_usb_asm24.py TestDevCopySpeeds
+      run: SIZE=64000000 PYTHONPATH=. GMMU=0 DEV=USB+AMD python3 test/external/external_test_usb_asm24.py

  driverbenchmarks:
    name: PCI Driver Benchmark (DEV=${{ matrix.dev }})
@@ -550,7 +565,7 @@ jobs:
      fail-fast: false
      matrix:
        dev: ['AMD', 'NV']
-    timeout-minutes: 20
+    timeout-minutes: 5
    defaults:
      run:
        shell: bash -e -o pipefail {0}
@@ -562,9 +577,8 @@ jobs:
      uses: actions/checkout@v6
    - name: Setup
      run: |
-        ./extra/amdpci/setup_python_cap.sh
-        ./extra/hcq/hcq_smi.py ${{ matrix.dev == 'AMD' && 'amd' || 'nv' }} rmmod
-        ./extra/hcq/hcq_smi.py ${{ matrix.dev == 'AMD' && 'amd' || 'nv' }} kill_pids
+        ./extra/hcq/hcq_smi.py ${{ matrix.dev }} rmmod --expect
+        ./extra/hcq/hcq_smi.py ${{ matrix.dev }} kill_pids --sudoless
        mkdir -p extra/datasets
        ln -s /raid/datasets/imagenet extra/datasets/imagenet
    - name: setup staging db
@@ -599,34 +613,28 @@ jobs:
      run: |
        GRAPH_ONE_KERNEL=1 NSZ=8192 python3 test/speed/external_test_copy_speed.py TestCopySpeed.testCopyDefaulttoCPUJit
        GRAPH_ONE_KERNEL=1 NSZ=8192 python3 test/speed/external_test_copy_speed.py TestCopySpeed.testCopyCPUtoDefaultJit
+    # TODO: HEVC decode timing test
+    # - name: HEVC Decode Benchmark
+    #   if: ${{ matrix.dev == 'NV' }}
+    #   run: IGNORE_BEAM_CACHE=1 VALIDATE=1 MAX_FRAMES=100 ASSERT_FPS=1400 JITBEAM=1 PYTHONPATH=. python3 extra/hevc/decode.py
    - name: Run 10 MLPerf ResNet50 training steps (1 gpu)
      if: ${{ matrix.dev == 'NV' }}
      run: BENCHMARK_LOG=resnet_10steps MNISTMOCK=1 DEFAULT_FLOAT=HALF BENCHMARK=10 BS=256 GPUS=1 MODEL=resnet python3 examples/mlperf/model_train.py
    - name: Run 10 MLPerf Bert training steps (1 gpu)
      # TODO: remove BERT_LAYERS once scheduler is fast
      run: BENCHMARK_LOG=bert_10steps CAPTURE_PROCESS_REPLAY=0 DEFAULT_FLOAT=HALF BENCHMARK=10 BS=66 GPUS=1 BERT_LAYERS=2 MODEL=bert python3 examples/mlperf/model_train.py
-    - name: Remote
-      run: |
-        pkill -f 'extra/remote/serve.py' || true
-        PYTHONPATH=. python3 extra/remote/serve.py 6482 &
-        sleep 1
-        DEBUG=2 PYTHONPATH=. REMOTE=127.0.0.1:6482 AM_RESET=1 python3 test/test_tiny.py
-        if [[ "${{ matrix.dev }}" == "AMD" ]]; then
-          DEBUG=2 PYTHONPATH=. REMOTE=127.0.0.1:6482 AM_RESET=1 AMD_AQL=1 python3 test/test_tiny.py
-        fi
-        pkill -f 'extra/remote/serve.py' || true
    - name: Run process replay tests
      uses: ./.github/actions/process-replay

  llvmspeed:
    name: LLVM Speed
    runs-on: [self-hosted, Linux, tinyboxrandom]
-    timeout-minutes: 20
+    timeout-minutes: 10
    if: github.repository_owner == 'tinygrad'
    steps:
    - name: Checkout Code
      uses: actions/checkout@v6
    - name: Speed Test
-      run: DEV=CPU:LLVM THREADS=0 python3 test/speed/external_test_speed_v_torch.py
+      run: DEV=CPU:LLVM python3 test/speed/external_test_speed_v_torch.py
    - name: Speed Test (BEAM=2)
-      run: BEAM=2 DEV=CPU:LLVM THREADS=0 python3 test/speed/external_test_speed_v_torch.py
+      run: IGNORE_BEAM_CACHE=1 BEAM=2 DEV=CPU:LLVM python3 test/speed/external_test_speed_v_torch.py
@@ -8,7 +8,7 @@ permissions:
  contents: write
 jobs:
  deploy:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
    steps:
      - uses: actions/checkout@v6
      - name: Configure Git Credentials
@@ -36,6 +36,8 @@ jobs:
        deps: testing_unit
    - name: Run unit tests
      run: DEV=METAL python -m pytest -n=auto test/unit/ --durations=20
+    - name: Run opt tests
+      run: DEV=METAL python -m pytest -n=auto test/opt --durations=20
    - name: Test tensor core ops (fake)
      run: DEV=METAL DEBUG=3 TC=2 python test/backend/test_ops.py TestOps.test_gemm
    - name: Test tensor core ops (real)
@@ -74,11 +76,12 @@ jobs:
    - name: Run pytest (ptx)
      env:
        DEV: "MOCK+NV:PTX"
+        HCQ_RUNTIME_DEV: PYTHON
        FORWARD_ONLY: 1
        # TODO: failing due to library loading error
        CAPTURE_PROCESS_REPLAY: 0
      run: |
-        python3 -m pytest -n=auto test/device/test_hcq.py test/test_tiny.py \
+        python3 -m pytest -n=auto test/device/test_hcq2.py test/test_tiny.py \
          test/testextra/test_hevc.py::TestHevc::test_hevc_decode_compile --durations=20
    - name: Run process replay tests
      uses: ./.github/actions/process-replay
@@ -166,7 +169,7 @@ jobs:
        uses: ./.github/actions/setup-tinygrad
        with:
          key: windows-${{ matrix.dev }}-minimal
-          deps: testing_unit
+          deps: testing_minimal
          pydeps: ${{ matrix.dev == 'WEBGPU' && 'dawn-python' || '' }}
      - name: Set env
        shell: bash
@@ -10,7 +10,7 @@ on:

 jobs:
  deploy:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
    steps:
    - uses: actions/checkout@v6
    - name: Set up Python
@@ -10,7 +10,7 @@ concurrency:
 jobs:
  checkbranch:
    name: Check PR Branch status
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
    outputs:
      branchstat: ${{ steps.brstat.outputs.stat}}
    steps:
@@ -44,7 +44,7 @@ jobs:
    permissions:
      contents: read
      pull-requests: write
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
    needs: checkbranch
    if: needs.checkbranch.outputs.branchstat == 'false'
    steps:
@@ -87,7 +87,7 @@ jobs:
    name: Core Library Line Difference
    permissions:
      pull-requests: write
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
    needs: checkbranch
    if: needs.checkbranch.outputs.branchstat == 'true'
    steps:
@@ -31,8 +31,7 @@ jobs:
    - name: Setup Environment
      uses: ./.github/actions/setup-tinygrad
      with:
-        deps: docs
-        pydeps: "capstone torch"
+        deps: "docs testing_minimal"
    - name: Build wheel and show size
      run: |
        uv build --wheel
@@ -73,10 +72,7 @@ jobs:
        deps: testing_unit
        pydeps: "pillow torchvision expecttest"
        llvm: 'true'
-    - name: Install ninja
-      run: |
-        sudo apt update || true
-        sudo apt install -y --no-install-recommends ninja-build
+        ninja: 'true'
    - name: Test ResNet-18
      run: DEBUG=2 python3 extra/torch_backend/example.py
    - name: Test one op in torch tests
@@ -86,6 +82,23 @@ jobs:
    - name: Custom tests
      run: DEV=CPU:LLVM GPUS=4 TINY_BACKEND=1 python3 -m pytest -nauto extra/torch_backend/test.py extra/torch_backend/test_inplace.py extra/torch_backend/test_multigpu.py extra/torch_backend/test_kernel_fusion.py --durations=20

+  torchbackendtrain:
+    name: Torch Backend Training
+    runs-on: ${{ github.repository == 'tinygrad/tinygrad' && github.event_name == 'pull_request' && github.event.pull_request.author_association == 'COLLABORATOR' && 'namespace-profile-tinygrad' || 'ubuntu-24.04' }}
+    timeout-minutes: 15
+    steps:
+    - name: Checkout Code
+      uses: actions/checkout@v6
+    - name: Setup Environment
+      uses: ./.github/actions/setup-tinygrad
+      with:
+        key: torch-backend-pillow-torchvision-et-pt
+        deps: testing_unit
+        llvm: 'true'
+        ninja: 'true'
+    - name: Test beautiful_mnist in torch with TINY_BACKEND
+      run: STEPS=20 DEV=CPU TARGET_EVAL_ACC_PCT=90.0 MAX_BUFFER_SIZE=0 TINY_BACKEND=1 python3 examples/other_mnist/beautiful_mnist_torch.py
+
  bepython:
    name: Python Backend
    runs-on: ${{ github.repository == 'tinygrad/tinygrad' && github.event_name == 'pull_request' && github.event.pull_request.author_association == 'COLLABORATOR' && 'namespace-profile-tinygrad' || 'ubuntu-24.04' }}
@@ -220,7 +233,7 @@ jobs:
    - name: Run process replay tests
      uses: ./.github/actions/process-replay
    - name: Repo line count <= 26000 lines
-      run: MAX_LINE_COUNT=26000 python sz.py
+      run: MAX_LINE_COUNT=26500 python sz.py

  spec:
    strategy:
@@ -377,10 +390,10 @@ jobs:
        run: |
          parallel --link --tagstring '[{1}]' '{2}' \
            ::: llama 'llama q4' qwen3.5 qwen \
-            ::: $'echo "What\'s a male chicken called? Answer with only one word." | python3 -m tinygrad.llm --model llama3.2:1b | tee /dev/stderr | grep -i rooster' \
-                $'echo "What\'s a male chicken called? Answer with only one word." | python3 -m tinygrad.llm --model llama3.2:1b-q4 | tee /dev/stderr | grep -i rooster' \
-                $'echo "What\'s a male chicken called? Answer with only one word." | python3 -m tinygrad.llm --model qwen3.5:0.8b | tee /dev/stderr | grep -i rooster' \
-                $'echo "What\'s a female chicken called? Answer with only one word." | python3 -m tinygrad.llm --model qwen3:0.6b | tee /dev/stderr | grep -i hen'
+            ::: $'echo "What\'s a male chicken called? Answer with only one word." | python3 -m tinygrad.llm --no_chat_template --model llama3.2:1b | tee /dev/stderr | grep -i rooster' \
+                $'echo "What\'s a male chicken called? Answer with only one word." | python3 -m tinygrad.llm --no_chat_template --model llama3.2:1b-q4 | tee /dev/stderr | grep -i rooster' \
+                $'echo "What\'s a male chicken called? Answer with only one word." | python3 -m tinygrad.llm --no_chat_template --model qwen3.5:0.8b | tee /dev/stderr | grep -i rooster' \
+                $'echo "What\'s a female chicken called? Answer with only one word." | python3 -m tinygrad.llm --no_chat_template --model qwen3:0.6b | tee /dev/stderr | grep -i hen'
                # NOTE: qwen is dumb and only knows about female chickens

 # ****** Models Tests ******
@@ -491,7 +504,7 @@ jobs:
      - name: Run AMD renderer tests (AMD:LLVM)
        run: DEV=MOCKKFD+AMD:LLVM python -m pytest -n=auto test/amd/ --durations 20
      - name: Run SQTT profiling tests
-        run: PROFILE=1 SQTT=1 python3 -m pytest -n=auto test/amd/test_sqtt_profiler.py
+        run: VIZ=-2 python3 -m pytest -n=auto test/amd/test_sqtt_profiler.py
      - name: Run AMD emulated tests on NULL backend
        env:
          AMD: 0
@@ -505,34 +518,15 @@ jobs:
      - name: Run LLVM test
        run: DEV=MOCKKFD+AMD:LLVM python test/device/test_amd_llvm.py

-  hcq2:
-    name: hcq2
-    runs-on: ${{ github.repository == 'tinygrad/tinygrad' && github.event_name == 'pull_request' && github.event.pull_request.author_association == 'COLLABORATOR' && 'namespace-profile-tinygrad' || 'ubuntu-24.04' }}
-    timeout-minutes: 5
-    steps:
-      - name: Checkout Code
-        uses: actions/checkout@v6
-      - name: Setup Environment
-        uses: ./.github/actions/setup-tinygrad
-        with:
-          key: hcq2
-          deps: testing_unit
-          amd: 'true'
-      - name: Run HCQ2 tests
-        run: HCQ_RUNTIME_DEV=PYTHON HCQ2=1 DEV=MOCKKFD+AMD FORWARD_ONLY=1 PYTHONPATH=. python test/test_tiny.py
-      - name: Run HCQ2 multi-device tests
-        run: HCQ_RUNTIME_DEV=PYTHON HCQ2=1 DEV=MOCKKFD+AMD FORWARD_ONLY=1 PYTHONPATH=. python -m pytest -n=auto test/backend/test_multitensor.py
-      - name: Run HCQ2 JIT tests
-        run: HCQ_RUNTIME_DEV=PYTHON HCQ2=1 DEV=MOCKKFD+AMD FORWARD_ONLY=1 PYTHONPATH=. python test/unit/test_jit.py
-      - name: Run HCQ2 unit tests
-        run: HCQ_RUNTIME_DEV=PYTHON HCQ2=1 DEV=MOCKKFD+AMD FORWARD_ONLY=1 PYTHONPATH=. python -m pytest test/device/test_hcq2.py
-
  testmockam:
    name: Linux (am)
    runs-on: ${{ github.repository == 'tinygrad/tinygrad' && github.event_name == 'pull_request' && github.event.pull_request.author_association == 'COLLABORATOR' && 'namespace-profile-tinygrad' || 'ubuntu-24.04' }}
    timeout-minutes: 15
    env:
      DEV: MOCKPCI+AMD
+      HCQ2: 1
+      HCQ_RUNTIME_DEV: PYTHON
+      PYTHONPATH: .
    steps:
      - name: Checkout Code
        uses: actions/checkout@v6
@@ -542,20 +536,14 @@ jobs:
          key: mockam
          deps: testing_unit
          amd: 'true'
-      - name: Run test_tiny on MOCKAM
-        run: python test/test_tiny.py
+      - name: Run tests on MOCKAM
+        run: python -m pytest test/test_tiny.py test/unit/test_jit.py
      - name: Run test_tiny on MOCKUSB
-        run: GMMU=0 DEV=MOCKUSB+AMD python test/test_tiny.py
-      - name: Run test_hcq on MOCKPCI
-        run: python -m pytest test/device/test_hcq.py
+        run: HCQ2=0 GMMU=0 DEV=MOCKUSB+AMD python test/test_tiny.py
+      - name: Run test_hcq2 on MOCKPCI
+        run: python -m pytest test/device/test_hcq2.py
      - name: Run disk copy tests on MOCKPCI
        run: python -m pytest test/unit/test_disk_tensor.py -k test_copy_from_disk
-      - name: Run test_tiny on MOCKPCI Remote
-        run: |
-          python extra/remote/serve.py 6667 &
-          sleep 2
-          REMOTE=127.0.0.1:6667 python test/test_tiny.py
-          REMOTE=127.0.0.1:6667 python -m pytest test/unit/test_disk_tensor.py -k test_copy_from_disk; kill %1

  testamd:
    strategy:
@@ -570,6 +558,9 @@ jobs:
    env:
      DEV: MOCKKFD+AMD:${{ matrix.backend == 'amdllvm' && 'LLVM' || '' }}:${{ matrix.arch }}
      SKIP_SLOW_TEST: 1
+      HCQ2: 1
+      HCQ_RUNTIME_DEV: PYTHON
+      PYTHONPATH: .
    steps:
      - name: Checkout Code
        uses: actions/checkout@v6
@@ -586,9 +577,11 @@ jobs:
          DEBUG=5 FORWARD_ONLY=1 python3 test/test_tiny.py TestTiny.test_plus
      - name: Run MXFP4 Llama training on NULL backend
        if: ${{ matrix.backend == 'amd' && matrix.arch == 'gfx950' }}
-        run: PYTHONPATH=. DEV=NULL:HIP:gfx950 MXFP4=1 LLAMA_LAYERS=2 BENCHMARK=3 NULL_ALLOW_COPYOUT=1 NO_HIPCC=1 ROCM_PATH=/opt/rocm JITBEAM=0 examples/mlperf/training_submission_v6.0/tinycorp/benchmarks/llama31_8b/implementations/tinybox_8xMI350X/profile.sh
+        run: HCQ2=0 PYTHONPATH=. DEV=NULL:HIP:gfx950 MXFP4=1 LLAMA_LAYERS=2 BENCHMARK=3 NULL_ALLOW_COPYOUT=1 NO_HIPCC=1 ROCM_PATH=/opt/rocm JITBEAM=0 examples/mlperf/training_submission_v6.0/tinycorp/benchmarks/llama31_8b/implementations/tinybox_8xMI350X/profile.sh
      - name: Run pytest (amd)
-        run: python -m pytest -n=auto test/backend/test_ops.py test/backend/test_dtype.py test/backend/test_dtype_alu.py test/backend/test_linearizer.py test/backend/test_randomness.py test/backend/test_jit.py test/backend/test_graph.py test/backend/test_multitensor.py test/device/test_hcq.py test/external/external_test_am.py test/backend/test_asm_gemm.py::TestAsmGEMM --durations=20
+        run: python -m pytest -n=auto test/backend/test_ops.py test/backend/test_dtype.py test/backend/test_dtype_alu.py test/backend/test_linearizer.py test/backend/test_randomness.py test/backend/test_jit.py test/backend/test_graph.py test/backend/test_multitensor.py test/device/test_hcq2.py test/external/external_test_am.py test/backend/test_asm_gemm.py::TestAsmGEMM --durations=20
+      - name: Run opt tests
+        run: python -m pytest -n=auto test/opt --durations=20
      - name: Run disk copy tests
        run: python -m pytest test/unit/test_disk_tensor.py -k test_copy_from_disk
      - name: Run TRANSCENDENTAL math
@@ -618,7 +611,7 @@ jobs:
          cuda: 'true'
          ocelot: 'true'
      - name: Set env
-        run: printf "${{ matrix.backend == 'ptx' && 'DEV=MOCK+CUDA:PTX' || matrix.backend == 'nv' && 'DEV=MOCK+NV\nSKIP_SLOW_TEST=1' }}" >> $GITHUB_ENV
+        run: printf "${{ matrix.backend == 'ptx' && 'DEV=MOCK+CUDA:PTX' || matrix.backend == 'nv' && 'DEV=MOCK+NV\nSKIP_SLOW_TEST=1\nHCQ_RUNTIME_DEV=PYTHON' }}" >> $GITHUB_ENV
      - name: Check Device.DEFAULT and print some source
        run: |
          python3 -c "from tinygrad import Device; assert Device.DEFAULT in ['CUDA','NV'], Device.DEFAULT"
@@ -666,4 +659,5 @@ jobs:
        run: |
          python -c "from tinygrad import Device; assert Device.DEFAULT == 'NULL'"
          DEBUG=4 python3 test/backend/test_ops.py TestOps.test_add
-          python -m pytest -n=auto test/backend/test_ops.py --durations=20
+          # QCOMCL compiles in qemu, too slow for parallel workers
+          ${{ contains(matrix.dev, 'QCOMCL') && 'PARALLEL=0' || '' }} python -m pytest -n=auto test/backend/test_ops.py --durations=20
@@ -69,3 +69,4 @@ mutants
 dagre/
 graphlib/
 uv.lock
+pi_session_window0.jsonl
@@ -28,7 +28,7 @@ repos:
        pass_filenames: false
      - id: tests
        name: comprehensive test suite
-        entry: env OMP_NUM_THREADS=1 SKIP_SLOW_TEST=1 PYTHONPATH="." python3 -m pytest -n=6 test/backend/test_ops.py test/backend/test_schedule.py test/unit/test_assign.py test/backend/test_tensor.py test/backend/test_jit.py test/unit/test_schedule_cache.py test/null/test_pattern_matcher.py test/null/test_uop_symbolic.py test/unit/test_helpers.py
+        entry: env OMP_NUM_THREADS=1 SKIP_SLOW_TEST=1 PYTHONPATH="." python3 -m pytest -n=6 test/backend/test_ops.py test/backend/test_schedule.py test/backend/test_assign.py test/backend/test_tensor.py test/backend/test_jit.py test/unit/test_schedule_cache.py test/null/test_pattern_matcher.py test/null/test_uop_symbolic.py test/unit/test_helpers.py
        language: system
        always_run: true
        pass_filenames: false
@@ -4,3 +4,5 @@
 - Run `python -m mypy tinygrad/` to typecheck
 - Run `python -m ruff check .` to lint
 - Read `./tinygrad/viz/README.md` for profiling and debugging rewrite rules
+- Do not do amend commits. Always do a new commit if a force push to origin would be required.
+- tinygrad has user space PCI drivers for AMD and NVIDIA GPUs. Do not insert the unneeded kernel modules.
@@ -140,7 +140,7 @@ Documentation along with a quick start guide can be found on the [docs website](
 ```python
 from tinygrad import Tensor

-x = Tensor.eye(3)
+x = Tensor.eye(3).clone()  # clone to make it a buffer
 y = Tensor([[2.0,0,-2.0]])
 z = y.matmul(x).sum()
 z.backward()
@@ -2,7 +2,7 @@ import os, pytest, signal, threading

@pytest.hookimpl(wrapper=True)
 def pytest_runtest_call(item):
-  t = threading.Timer(int(os.getenv("TEST_TIMEOUT", 300)), os.kill, args=(os.getpid(), signal.SIGABRT))
+  t = threading.Timer(int(os.getenv("TEST_TIMEOUT", 90)), os.kill, args=(os.getpid(), signal.SIGABRT))
  t.start()
  try: yield
  finally:
@@ -122,7 +122,7 @@ def example_5_custom_assembly(a:Tensor, correct):
        offset_dwords = (self.labels[inst._target] - inst._pos - inst.size()) // 4
        if not -32768 <= offset_dwords <= 32767: raise ValueError(f"branch to '{inst._target}' offset {offset_dwords} exceeds simm16 range")
        inst.simm16 = offset_dwords
-      return UOp(Ops.PROGRAM, src=(sink, UOp(Ops.LINEAR, src=tuple([UOp(Ops.INS, arg=x) for x in self.instructions]))))
+      return UOp(Ops.PROGRAM, src=(sink, UOp(Ops.LINEAR, src=tuple([UOp(Ops.INS, arg=(x, dtypes.void)) for x in self.instructions]))))

  CU_COUNT = 32
  LANES = 64
@@ -52,7 +52,7 @@ In `kernel.py` we have a set of `OptOps`, these control the parameters of the sp

 The main bottleneck in most kernels is accessing memory. In a freshman algorithms class, you'll learn about cache aware matrix multiplication, and this is all forms of that. While the same math is run, the order in which you run it can have large impacts on the speed depending on if the data you are loading. OptOps will change this order.

-Memory, even cache, is often much slower than accessing the register file. The amount of times data is used in math is called the "arithmetic intensity". For operations like BS=1 GEMV, the arithmetic intensity is 1, but for GEMMs and convs it can be much higher. OptOps like UPCAST and UNROLL can increase this, but be careful of making them too large, as if there's too much register pressure on the GPU the warp scheduler may not be able to fit many warps, or even worse, it could be spilling to local memory.
+Memory, even cache, is often much slower than accessing the register file. The amount of times data is used in math is called the "arithmetic intensity". For operations like BS=1 GEMV, the arithmetic intensity is 1, but for GEMMs and convs it can be much higher. Splitting an axis into UPCAST can increase this, but be careful of making them too large, as if there's too much register pressure on the GPU the warp scheduler may not be able to fit many warps, or even worse, it could be spilling to local memory.

 4090s have 1 TB/s of ram bandwidth and ~160 TFLOPS of compute, so you need to use each loaded value ~100 times. The L1 cache has around 40 TB/s of bandwidth, so in order to get full compute utilization you need to use each value ~4 times.

@@ -57,7 +57,7 @@ class TransformerBlock:

  def __call__(self, x:Tensor, start_pos:Variable, mask:Optional[Tensor]):
    h = x + self.attn(self.ln_1(x), start_pos, mask).float()
-    return (h + self.mlp(self.ln_2(h))).contiguous()
+    return (h + self.mlp(self.ln_2(h))).clone()

 class Transformer:
  def __init__(self, dim, n_heads, n_layers, norm_eps, vocab_size, max_seq_len=1024):
@@ -5,7 +5,7 @@ from multiprocessing import Queue, Process, shared_memory, connection, Lock

 import numpy as np
 from tinygrad import dtypes, Tensor
-from tinygrad.helpers import getenv, prod, Context, round_up, tqdm, OSX, NUM_CPU_THREADS
+from tinygrad.helpers import getenv, prod, Context, round_up, tqdm, OSX, CPU_COUNT
 from tinygrad.nn.state import TensorIO

 ### ResNet
@@ -131,7 +131,7 @@ def batch_load_resnet(batch_size=64, val=False, shuffle=True, seed=None, pad_fir
    else: X = Tensor.empty(*sz, dtype=dtypes.uint8, device=f"disk:/dev/shm/{shm_name}")
    Y = [None] * (batch_size*BATCH_COUNT)

-    for _ in range(NUM_CPU_THREADS.value):
+    for _ in range(CPU_COUNT):
      p = Process(target=loader_process, args=(q_in, q_out, X, seed))
      p.daemon = True
      p.start()
@@ -212,7 +212,7 @@ def batch_load_train_bert(BS:int, seed:int|None=None):
    rng.shuffle(fs)
    train_files.append(fs.pop(0))

-  cycle_length = min(NUM_CPU_THREADS.value, len(train_files))
+  cycle_length = min(CPU_COUNT, len(train_files))
  assert cycle_length > 0, "cycle_length must be greater than 0"

  dataset = InterleavedDataset(train_files, cycle_length)
@@ -301,7 +301,7 @@ def batch_load_unet3d(preprocessed_dataset_dir:Path, batch_size:int=6, val:bool=
    X = Tensor.empty(*sz, dtype=dtypes.float32, device=f"disk:/dev/shm/{shm_name_x}")
    Y = Tensor.empty(*sz, dtype=dtypes.uint8, device=f"disk:/dev/shm/{shm_name_y}")

-    for _ in range(NUM_CPU_THREADS.value):
+    for _ in range(CPU_COUNT):
      proc = Process(target=load_unet3d_data, args=(preprocessed_dataset_dir, seed, queue_in, queue_out, X, Y))
      proc.daemon = True
      proc.start()
@@ -437,7 +437,7 @@ def batch_load_retinanet(dataset, val:bool, base_dir:Path, batch_size:int=32, sh
  dataset_iter = iter(image_ids)

  try:
-    for _ in range(NUM_CPU_THREADS.value):
+    for _ in range(CPU_COUNT):
      proc = Process(
        target=load_retinanet_data,
        args=(base_dir, val, queue_in, queue_out, imgs, boxes, labels),
@@ -1667,15 +1667,14 @@ def train_llama3():
 def train_gptoss():
  from examples.mlperf.models.gpt_oss import GPTOSS, GPT_OSS_20B, apply_grad, FP8_DTYPE
  from examples.mlperf.lr_schedulers import CosineAnnealingLRWithWarmup
-  from examples.mlperf.optim import GradAccClipAdamW, GradAccClipAdamWGroup, clip_grads
+  from examples.mlperf.optim import GradAccClipAdamW, GradAccClipAdamWGroup, fclip_grads

  BENCHMARK = getenv("BENCHMARK")

  config = {}
  BASEDIR            = config["BASEDIR"]                = Path(getenv("BASEDIR", "/raid/datasets/c4-8b/"))
  BS                 = config["BS"]                     = getenv("BS", 16)
-  grad_acc           = config["GRADIENT_ACC_STEPS"]     = getenv("GRADIENT_ACC_STEPS", 1)
-  GBS                = config["GLOBAL_BATCH_SIZE"]      = BS * grad_acc
+  GBS                = config["GLOBAL_BATCH_SIZE"]      = BS
  SEED               = config["SEED"]                   = getenv("SEED", 5760)
  DATA_SEED          = config["DATA_SEED"]              = getenv("DATA_SEED", SEED)
  SEQLEN             = config["SEQLEN"]                 = getenv("SEQLEN", 8192)
@@ -1737,13 +1736,13 @@ def train_gptoss():
  params_wd = [p for p in params if p.ndim >= 3]
  params_no_wd = [p for p in params if p.ndim < 3]
  optim = GradAccClipAdamWGroup(
-    GradAccClipAdamW(params_wd, lr=0.0, b1=opt_adamw_beta_1, b2=opt_adamw_beta_2, eps=opt_adamw_epsilon, weight_decay=opt_adamw_weight_decay, grad_acc=grad_acc, device=optim_device),
-    GradAccClipAdamW(params_no_wd, lr=0.0, b1=opt_adamw_beta_1, b2=opt_adamw_beta_2, eps=opt_adamw_epsilon, weight_decay=0.0, grad_acc=grad_acc, device=optim_device),
+    GradAccClipAdamW(params_wd, lr=0.0, b1=opt_adamw_beta_1, b2=opt_adamw_beta_2, eps=opt_adamw_epsilon, weight_decay=opt_adamw_weight_decay, grad_acc=1, device=optim_device),
+    GradAccClipAdamW(params_no_wd, lr=0.0, b1=opt_adamw_beta_1, b2=opt_adamw_beta_2, eps=opt_adamw_epsilon, weight_decay=0.0, grad_acc=1, device=optim_device),
  )

  for p in optim.params:
-    grad_dtype = dtypes.bfloat16 if p.dtype == FP8_DTYPE else p.dtype
-    p.grad = p.zeros_like(dtype=grad_dtype).contiguous()
+    p.grad = p.zeros_like(dtype=dtypes.bfloat16 if p.dtype == FP8_DTYPE else p.dtype).contiguous()
+    if getattr(p, "_zero2", False): p.grad = optim.optimizers[0]._zero_shard(p.grad)
  grads = [p.grad for p in optim.params]

  from extra.gemm.cdna_asm_gemm import _mx_block_scale
@@ -1770,31 +1769,32 @@ def train_gptoss():

  @TinyJit
  @Context(TRAINING=1)
-  def minibatch(tokens:Tensor):
+  def step(tokens:Tensor):
    if is_dp: tokens = tokens.to(None).shard(device, 0)
    if not is_sharding: tokens = tokens.to(None)
+
    logits:Tensor = model(tokens[:, :-1], save=True)
-    loss = logits.sparse_categorical_crossentropy(tokens[:, 1:])
+    if getenv("FUSED_CE", 0):
+      from extra.llama_kernels.fused_ce import fused_ce_loss
+      loss = fused_ce_loss(logits.cast(dtypes.bfloat16), tokens[:, 1:], label_smoothing=0.0)
+    else:
+      loss = logits.sparse_categorical_crossentropy(tokens[:, 1:])

    for g, new_g in zip(grads, loss.gradient(*optim.params)):
      apply_grad(g, new_g.uop)

-    loss_cpu = loss.flatten().float().to("CPU")
-    return loss_cpu.realize(*grads)
+    Tensor.realize(loss, *grads)

-  @TinyJit
-  def optim_step():
-    grad_norm = clip_grads(grads, grad_acc, 1.0)
-    optim.fstep(grads, grad_norm)
+    clipped_grads, grad_norm = fclip_grads(grads, 1.0)
+    optim.fstep(clipped_grads, grad_norm)
    scheduler.step()

-    for g in grads: g.assign(0)
-
+    loss_cpu = loss.flatten().float().to("CPU")
    lr_cpu = optim.lr.float().to("CPU")
    grad_norm_cpu = grad_norm.float().to("CPU")
-    Tensor.realize(lr_cpu, grad_norm_cpu, *grads, *fp8_inv_scales)
+    Tensor.realize(loss_cpu, lr_cpu, grad_norm_cpu, *grads, *fp8_inv_scales)

-    return lr_cpu, grad_norm_cpu
+    return loss_cpu, lr_cpu, grad_norm_cpu

  @TinyJit
  @Context(TRAINING=0)
@@ -1843,30 +1843,20 @@ def train_gptoss():
      profile_marker(f"train @ {i}")
      st = time.perf_counter()

-      stopped = False
-      losses, data_time, dev_time = [], 0, 0
-      for _ in range(grad_acc if i >= 2 else 1):
-        ist = time.perf_counter()
-        try: tokens = next(train_iter)
-        except StopIteration:
-          stopped = True
-          break
-        mst = time.perf_counter()
-        data_time += mst - ist
-        losses.append(minibatch(tokens).item())
-        dev_time += time.perf_counter() - mst
-      if stopped: break
+      ist = time.perf_counter()

-      gt = time.perf_counter()
-      ret = optim_step()
-      lr, grad_norm = ret[0].item(), ret[1].item()
+      try: tokens = next(train_iter)
+      except StopIteration: break
+      mst = time.perf_counter()
+      data_time = mst - ist
+
+      ret = step(tokens)
+      dev_time = time.perf_counter() - mst
+
+      loss, lr, grad_norm = ret[0].item(), ret[1].item(), ret[2].item()
      et = time.perf_counter()

-      loss = sum(losses) / len(losses)
-      optim_time = et - gt
-      dev_time += optim_time
      step_time = et - st
-      gbs_time = gt - st
      if BENCHMARK: step_times.append(step_time)

      i += 1
@@ -1876,7 +1866,7 @@ def train_gptoss():
      gflops = GlobalCounters.global_ops / 1e9 / dev_time
      mfu = ((6 * num_params * SEQLEN * GBS) / (dev_time * device_count * 4.6e15)) * 100
      tqdm.write(
-          f"{i:5} {step_time:.3f} s step, {gbs_time:.3f} s gbs, {optim_time:.3f} s optim, {data_time:.3f} s data, {loss:.4f} loss, " \
+          f"{i:5} {step_time:.3f} s step, {dev_time:.3f} s dev, {data_time:.3f} s data, {loss:.4f} loss, " \
          f"{lr:.12f} LR, {grad_norm:.6f} grad_norm, {mem_gb:.2f} GB used, {gflops:9.2f} GFLOPS, {mfu:5.2f}% MFU")
      if DEBUG >= 1: tqdm.write("  mem per device: " + ', '.join(f"{dev}: {mem/1e9:.2f} GB" for dev, mem in sorted(GlobalCounters.mem_used_per_device.items())))

@@ -1886,8 +1876,6 @@ def train_gptoss():
          "train/lr": lr,
          "train/grad_norm": grad_norm,
          "train/step_time": step_time,
-          "train/gbs_time": gbs_time,
-          "train/optim_time": optim_time,
          "train/dev_time": dev_time,
          "train/data_time": data_time,
          "train/mem": mem_gb,
@@ -12,9 +12,9 @@ from tinygrad.helpers import Timing, colored, GlobalCounters, profile_marker
 from tinygrad.uop.ops import Ops, UOp
 from extra.models.llama import apply_rotary_emb
 from extra.llama_kernels.rmsnorm import rmsnorm
-from extra.gemm.cdna_asm_gemm import _mx_block_scale, _mx_block_scale_3d, quantize_mxfp8, asm_gemm, can_use_asm_gemm
+from extra.gemm.cdna_asm_gemm import _mx_block_scale, _mx_block_scale_3d, quantize_mxfp8, asm_gemm, can_use_asm_gemm, mx_pack
 from extra.gemm.moe_gemm import grouped_mx_gemm
-from extra.gemm.moe_routing import route, dispatch, combine
+from extra.gemm.moe_routing import route, dispatch, combine, router_mfma

 FP8_DTYPE = dtypes.fp8e4m3
 FP8_MAX = 448.0
@@ -41,7 +41,7 @@ def _quant_dequant_bwd(grad:UOp, call:UOp) -> tuple:

 def quant_dequant_mx(x:Tensor) -> Tensor:
  fxn = _quant_dequant_fwd_fxn(x.as_param(0).uop, x.device)
-  return Tensor(UOp.maketuple(fxn.uop).call(x.uop, grad_fxn=_quant_dequant_bwd).gettuple(0))
+  return Tensor(fxn.uop.call_with_output(x.uop, grad_fxn=_quant_dequant_bwd))

 def _mx_scale(e8:Tensor) -> Tensor:
  return _mx_block_scale(e8) if e8.ndim == 2 else _mx_block_scale_3d(e8)
@@ -58,10 +58,27 @@ def _dequant_bwd(grad:UOp, call:UOp) -> tuple:

 def dequant_weight(w_q:Tensor, w_scale:Tensor) -> Tensor:
  fxn = _dequant_fwd_fxn(w_q.as_param(0).uop, w_scale.as_param(1).uop, w_q.device)
-  call = UOp.maketuple(fxn.uop).call(w_q.uop, w_scale.uop, grad_fxn=_dequant_bwd)
-  return Tensor(call.gettuple(0))
+  return Tensor(fxn.uop.call_with_output(w_q.uop, w_scale.uop, grad_fxn=_dequant_bwd))

-def matmul_mx(x:Tensor, w_q:Tensor, w_scale:Tensor) -> Tensor:
+def matmul_mx(x:Tensor|tuple[Tensor, Tensor], w_q:Tensor, w_scale:Tensor) -> Tensor:
+  if isinstance(x, tuple):
+    assert ASM_GEMM, "pre-quantized MXFP8 input requires ASM_GEMM"
+    from extra.gemm.cdna_asm_gemm import asm_gemm, can_use_asm_gemm, mx_pack
+    x_q, x_e8 = x
+    l_shape, padded = x_q.shape[:-1], x_q.shape[-1]
+    x_q, x_e8 = x_q.reshape(-1, padded), x_e8.reshape(-1, padded // 32)
+    K, N = w_q.shape[1], w_q.shape[0]
+    assert padded >= K and (padded - K) % 32 == 0 and x_e8.shape[-1] == padded // 32
+    wq, ws = w_q, w_scale
+    if (pad := padded - K):
+      wq = wq.pad(((0, 0), (0, pad)))
+      ws = ws.pad(((0, 0), (0, pad // 32)), value=127).cast(dtypes.uint8)
+    if (npad := (-N) % 256):
+      wq = wq.pad(((0, npad), (0, 0)))
+      ws = ws.pad(((0, npad), (0, 0)), value=127).cast(dtypes.uint8)
+    assert can_use_asm_gemm(x_q, wq.T)
+    out = asm_gemm(x_q, wq.T, mx=True, mx_scales=(mx_pack(x_e8), x_e8, mx_pack(ws), ws), mx_w_stored=True)
+    return (out[:, :N] if npad else out).reshape(*l_shape, N).cast(dtypes.bfloat16)
  l_shape = x.shape[:-1]
  if ASM_GEMM:
    from extra.gemm.cdna_asm_gemm import asm_gemm, can_use_asm_gemm, mx_pack
@@ -146,6 +163,7 @@ class GPTOSS:
      return w_q, w_e8.is_param_(False)
    if moe:
      qs = [_one(*shape[1:]) for _ in range(shape[0])]
+      for q in qs: q[0]._zero2 = True  # grad arrives sharded on the expert axis under ZeRO-2 (moe_gemm)
      return [q[0] for q in qs], [q[1] for q in qs]
    return _one(*shape)

@@ -174,18 +192,34 @@ class GPTOSS:
  def attention(self, x:Tensor, freqs_cis:Tensor, mask:Tensor, sliding:bool, *, attention_norm:Tensor, wqkv:Tensor,
                wqkv_scale:Tensor, wqkv_bias:Tensor, wo:Tensor, wo_scale:Tensor, wo_bias:Tensor, sinks:Tensor):
    bsz, seqlen, _ = x.shape
-    x_normed, rrms = rmsnorm(x, self.norm_eps)
-    qkv = matmul_mx(x_normed * attention_norm, wqkv, wqkv_scale) + wqkv_bias
+
+    if getenv("FUSED_RMSNORM_MX", 0):
+      from extra.gptoss_kernels.rmsnorm import rmsnorm_mul_quantize_mxfp8
+      x_q, x_e8, rrms = rmsnorm_mul_quantize_mxfp8(x, attention_norm, self.norm_eps)
+      qkv = matmul_mx((x_q, x_e8), wqkv, wqkv_scale) + wqkv_bias
+      norm_saves = [x_q, x_e8, rrms]
+    if getenv("FUSED_RMSNORM_MUL", 0):
+      from extra.gptoss_kernels.rmsnorm import rmsnorm_mul
+      x_normed, rrms = rmsnorm_mul(x, attention_norm, self.norm_eps)
+      qkv = matmul_mx(x_normed, wqkv, wqkv_scale) + wqkv_bias
+      norm_saves = [x_normed, rrms]
+    else:
+      x_normed, rrms = rmsnorm(x, self.norm_eps)
+      qkv = matmul_mx(x_normed * attention_norm, wqkv, wqkv_scale) + wqkv_bias
+      norm_saves = [x_normed, rrms]
+
    qkv = qkv.reshape(bsz, seqlen, self.n_kv_heads, self.n_rep + 2, self.head_dim)
    xq = qkv[:, :, :, :self.n_rep].reshape(bsz, seqlen, self.n_heads, self.head_dim)
    xk, xv = qkv[:, :, :, self.n_rep], qkv[:, :, :, self.n_rep + 1]
    xq, xk = apply_rotary_emb(xq, xk, freqs_cis)
    xq, xk, xv = xq.cast(dtypes.bfloat16), xk.cast(dtypes.bfloat16), xv.cast(dtypes.bfloat16)  # (B,N,H,D)/(B,N,KV,D)

+    fa_saves = []
    if getenv("HK_FLASH_ATTENTION"):
      from extra.thunder.amd.fa import flash_attention
-      attn, *_ = flash_attention(xq, xk, xv, is_causal=True, write_flat=True, sinks=sinks, window=self.sliding_window if sliding else 0)
+      attn, _, l_vec = flash_attention(xq, xk, xv, is_causal=True, write_flat=True, sinks=sinks, window=self.sliding_window if sliding else 0)
      attn = attn.reshape(bsz, seqlen, self.n_heads * self.head_dim)
+      fa_saves = [xq, xk, xv, l_vec]
    elif sliding:
      attn = self._sliding_attention(xq, xk, xv, sinks)
    else:
@@ -199,14 +233,20 @@ class GPTOSS:
      attn = (w @ xvm).permute(0, 3, 1, 2, 4).reshape(bsz, seqlen, self.n_heads * self.head_dim)

    out = matmul_mx(attn, wo, wo_scale) + wo_bias
-    return out, [x_normed, rrms, attn]
+    return out, [attn] + norm_saves + fa_saves

  def feed_forward(self, x:Tensor, *, ffn_norm:Tensor, gate:Tensor, gate_bias:Tensor,
                   w_gate_up:Tensor, w_gate_up_scale:Tensor, w_gate_up_bias:Tensor,
                   w_down:Tensor, w_down_scale:Tensor, w_down_bias:Tensor):
-    x_normed, rrms = rmsnorm(x, self.norm_eps)
-    inp = x_normed * ffn_norm
-    logits = inp.float() @ gate.float().T + gate_bias.float()
+    if getenv("FUSED_RMSNORM_MUL", 0):
+      from extra.gptoss_kernels.rmsnorm import rmsnorm_mul
+      x_normed, rrms = rmsnorm_mul(x, ffn_norm, self.norm_eps)
+      inp = x_normed
+    else:
+      x_normed, rrms = rmsnorm(x, self.norm_eps)
+      inp = x_normed * ffn_norm
+
+    logits = router_mfma(inp, gate, gate_bias) if getenv("ROUTER_MFMA", 0) else inp.float() @ gate.float().T + gate_bias.float()
    dim, inter = self.dim, self.intermediate_size

    if getenv("GROUPED_MOE", 0):
@@ -220,6 +260,7 @@ class GPTOSS:
      z = grouped_mx_gemm(_pad_cols(y.cast(dtypes.bfloat16)), (w_down, w_down_scale), r.off)[:, :dim] \
          + (onehot @ w_down_bias.float()).cast(dtypes.bfloat16)
      out = combine(z, r, inp.shape[0], self.experts_per_tok).reshape(bsz, seqlen, dim)
+      return out, [x_normed, rrms, xg, h, y, z, r.weights, r.dest_row, r.off]
    else:
      thresh = logits.topk(self.experts_per_tok)[0][..., -1:]
      weights = (logits >= thresh).where(logits, -float("inf")).softmax(-1)
@@ -264,10 +305,25 @@ class GPTOSS:
      h, *_ = self.run_layer(h, freqs_cis, mask_full, i % 2 == 0, attn_kwargs, ffn_kwargs, save=save)

    h_normed = self.norm(h)
-    pad = (-self.dim) % 256
-    h_padded, w_padded = h_normed.pad((None, None, (0, pad))), self.output.pad(((0, 0), (0, pad)))
-    if ASM_GEMM and can_use_asm_gemm(h_padded, w_padded.T): logits = asm_gemm(h_padded, w_padded.T)
-    else: logits = h_normed @ self.output.T
+
+    if getenv("FP8_LMHEAD", 0) and ASM_GEMM:
+      pad = (-self.dim) % 256
+      h2 = h_normed.reshape(-1, self.dim).pad(((0, 0), (0, pad)))
+      w2 = self.output.pad(((0, 0), (0, pad)))
+      hq, he8, hsi = quantize_mxfp8(h2)
+      oq, oe8, _ = quantize_mxfp8(w2)
+      if hsi is not None and can_use_asm_gemm(hq, oq.T):
+        logits = asm_gemm(hq, oq.T, mx=True, mx_scales=(hsi, he8, mx_pack(oe8), oe8), mx_w_stored=False)
+        logits = logits.reshape(bsz, seqlen, self.vocab_size).cast(dtypes.bfloat16)
+      else:
+        logits = h_normed @ self.output.T
+    elif ASM_GEMM:
+      pad = (-self.dim) % 256
+      h_padded, w_padded = h_normed.pad((None, None, (0, pad))), self.output.pad(((0, 0), (0, pad)))
+      logits = asm_gemm(h_padded, w_padded.T) if can_use_asm_gemm(h_padded, w_padded.T) and getenv("VOCAB_ASM", 1) else h_normed @ self.output.T
+    else:
+      logits = h_normed @ self.output.T
+
    return logits

 def _get_pads(uop:UOp) -> list[UOp]:
@@ -278,14 +334,14 @@ def apply_grad(grad_buf:Tensor, new_grad:UOp):
  pads = _get_pads(new_grad)
  if len(pads) <= 1:
    new_grad = new_grad.cast(grad_buf.dtype)
-    grad_buf.uop = grad_buf.uop.after(grad_buf.uop.store(grad_buf.uop + new_grad))
+    grad_buf.uop = grad_buf.uop.after(grad_buf.uop.store(new_grad))
    return
  cur = grad_buf.uop
  for pad in sorted(pads, key=lambda p: p.marg[0][0] if p.op == Ops.PAD else 0, reverse=True):
    if pad.op == Ops.PAD:
-      grad_shrink = tuple([(p[0], s+p[0]) for s,p in zip(pad.src[0].shape, pad.marg)])
+      grad_shrink = tuple((p[0], s+p[0]) for s,p in zip(pad.src[0].shape, pad.marg))
      buf_slice = cur.shrink(grad_shrink)
-      cur = cur.after(buf_slice.store(buf_slice + pad.src[0].cast(cur.dtype)))
+      cur = cur.after(buf_slice.store(pad.src[0].cast(cur.dtype)))
    else:
      cur = cur.after(cur.store(cur + pad.cast(cur.dtype)))
  grad_buf.uop = cur
@@ -15,7 +15,7 @@ def stochastic_round_bf16(x:Tensor) -> Tensor:
  bits = x.bitcast(dtypes.uint32)
  if isinstance(x.device, tuple):
    shape = x.uop.shard_shape if x.uop.axis is not None else x.shape
-    noise = Tensor(UOp(Ops.MSTACK, dtypes.default_float, tuple(Tensor.rand(*shape, device=d).uop for d in x.device)))
+    noise = Tensor(UOp(Ops.MSTACK, src=tuple(Tensor.rand(*shape, device=d).uop for d in x.device)))
  else:
    noise = x.rand_like()
  noise = (noise * 0xFFFF).cast(dtypes.uint32)
@@ -27,6 +27,11 @@ def clip_grads(grads:list[Tensor], grad_acc, clip_norm) -> Tensor:
  for g in grads: g.assign((g * (clip_norm / (total_norm + 1e-6)).clamp(max_=1.0)).cast(g.dtype))
  return total_norm

+def fclip_grads(grads:list[Tensor], clip_norm) -> Tensor:
+  total_norm = Tensor.stack(*[g.float().square().sum() for g in grads]).sum().sqrt().contiguous()
+  scale = (clip_norm / (total_norm + 1e-6)).clamp(max_=1.0)
+  return [(g * scale).cast(g.dtype) for g in grads], total_norm
+
 class GradAccClipAdamW(Optimizer):
  def __init__(self, params:list[Tensor], lr=0.001, b1=0.9, b2=0.999, eps=1e-6, weight_decay=0.0, grad_acc=1, clip_norm=1.0, device=None, fused=FUSE_OPTIM):
    super().__init__(params, lr, device, fused)
@@ -0,0 +1,13 @@
+from pathlib import Path
+
+from examples.mlperf.dataloader import get_llama3_dataset
+from tinygrad.helpers import getenv
+
+BASEDIR = Path(getenv("BASEDIR", "/raid/datasets/c4-8b/"))
+SAMPLES = getenv("SAMPLES", 1_200_000 * 32)
+EVAL_SAMPLES = getenv("EVAL_SAMPLES", 1024)
+SEQLEN = getenv("SEQLEN", 8192)
+DATA_SEED = getenv("DATA_SEED", 5760)
+
+get_llama3_dataset(SAMPLES, SEQLEN, BASEDIR, seed=DATA_SEED, val=False, small=True)
+get_llama3_dataset(EVAL_SAMPLES, SEQLEN, BASEDIR, seed=0, val=True, small=True)
@@ -35,7 +35,7 @@ export BASEDIR="/raid/datasets/c4-8b/"
 export SMALL=1
 export LLAMA3_SIZE=${LLAMA3_SIZE:-"8B"}
 export EVAL_TARGET=3.3 EVAL_FREQ=12288
-export LR="1e-3" END_LR="1e-4" WARMUP_SAMPLES=4096 MAX_STEPS=1200000
+export LR="1e-3" END_LR="1e-4" WARMUP_SAMPLES=2048 MAX_STEPS=1200000
 export WARMUP_STEPS=$((WARMUP_SAMPLES / GBS))
 export SAMPLES=$((MAX_STEPS * GBS))
 export SEQLEN=${SEQLEN:-8192}
@@ -44,9 +44,9 @@ export SEED=${SEED:-5760}
 export DATA_SEED=${DATA_SEED:-5760}

 export JITBEAM=${JITBEAM:-3}
-export BEAM_UOPS_MAX=6000 BEAM_UPCAST_MAX=256 BEAM_LOCAL_MAX=1024 BEAM_MIN_PROGRESS=5 BEAM_PADTO=1
+export BEAM_UOPS_MAX=6000 BEAM_UPCAST_MAX=256 BEAM_LOCAL_MAX=1024 BEAM_MIN_PROGRESS=5 BEAM_PADTO=0

-export FAKEDATA=${FAKEDATA:-$([[ "$DEV" == NULL:* ]] && echo 1 || echo 0)} BENCHMARK=${BENCHMARK:-10}
+export FAKEDATA=${FAKEDATA:-1} BENCHMARK=${BENCHMARK:-10}
 if [ -z "$FULL_LAYERS" ]; then
  export LLAMA_LAYERS=${LLAMA_LAYERS:-2}
 fi
@@ -35,7 +35,7 @@ export BASEDIR="/raid/datasets/c4-8b/"
 export SMALL=1
 export LLAMA3_SIZE=${LLAMA3_SIZE:-"8B"}
 export EVAL_TARGET=3.3 EVAL_FREQ=12288
-export LR="1e-3" END_LR="1e-4" WARMUP_SAMPLES=4096 MAX_STEPS=1200000
+export LR="1e-3" END_LR="1e-4" WARMUP_SAMPLES=2048 MAX_STEPS=1200000
 export WARMUP_STEPS=$((WARMUP_SAMPLES / GBS))
 export SAMPLES=$((MAX_STEPS * GBS))
 export SEQLEN=${SEQLEN:-8192}
@@ -44,6 +44,6 @@ export SEED=${SEED:-$RANDOM}
 export DATA_SEED=${DATA_SEED:-5760}

 export JITBEAM=${JITBEAM:-3}
-export BEAM_UOPS_MAX=6000 BEAM_UPCAST_MAX=256 BEAM_LOCAL_MAX=1024 BEAM_MIN_PROGRESS=5 BEAM_PADTO=1
+export BEAM_UOPS_MAX=6000 BEAM_UPCAST_MAX=256 BEAM_LOCAL_MAX=1024 BEAM_MIN_PROGRESS=5 BEAM_PADTO=0

 python3 examples/mlperf/model_train.py
@@ -17,7 +17,7 @@ export USE_ATOMICS=1
 export ASM_GEMM=1
 export WQKV=1
 export MASTER_WEIGHTS=1
-export FP8=1
+export MXFP4=1
 export ALLREDUCE_CAST=1
 export FAST_CE=1
 export FUSED_INPUT_QUANTIZE=1
@@ -26,7 +26,7 @@ export FUSED_ADD_NORM_MUL_QUANTIZE=1
 export FUSED_SILU_W13=1
 export SPLIT_W13=0

-export DEFAULT_FLOAT="bfloat16" OPTIM_DTYPE="bfloat16"
+export DEFAULT_FLOAT="bfloat16" OPTIM_DTYPE="float32"
 export DP=8 MP=1 BS=16 EVAL_BS=8 GRADIENT_ACC_STEPS=2
 export GBS=$((BS * GRADIENT_ACC_STEPS))

@@ -44,7 +44,7 @@ export SEED=$RANDOM
 export DATA_SEED=$SEED

 export JITBEAM=3
-export BEAM_UOPS_MAX=6000 BEAM_UPCAST_MAX=256 BEAM_LOCAL_MAX=1024 BEAM_MIN_PROGRESS=5 BEAM_PADTO=1
+export BEAM_UOPS_MAX=6000 BEAM_UPCAST_MAX=256 BEAM_LOCAL_MAX=1024 BEAM_MIN_PROGRESS=5 BEAM_PADTO=0

 export LOGMLPERF=1

@@ -107,14 +107,21 @@ def compile(onnx_file):
  return inputs, test_val

 def test_vs_compile(run, inputs, test_val=None):
+  if (log:=bool(getenv("BENCHMARK_LOG", ""))): from extra.bench_log import WallTimeEvent, BenchEvent

  # run 20 times
  step_times = []
  for _ in range(20):
    st = time.perf_counter()
-    out = run(**inputs)
-    mt = time.perf_counter()
-    val = out.numpy()
+    if log:
+      with WallTimeEvent(BenchEvent.STEP):
+        out = run(**inputs)
+        mt = time.perf_counter()
+        val = out.numpy()
+    else:
+      out = run(**inputs)
+      mt = time.perf_counter()
+      val = out.numpy()
    et = time.perf_counter()
    step_times.append((et-st)*1e3)
    print(f"enqueue {(mt-st)*1e3:6.2f} ms -- total run {step_times[-1]:6.2f} ms")
@@ -160,12 +167,6 @@ def test_vs_onnx(new_inputs, test_val, onnx_file, tol):
  print("test vs onnx passed")
  return timings

-def bench(run, inputs):
-  from extra.bench_log import WallTimeEvent, BenchEvent
-  for _ in range(10):
-    with WallTimeEvent(BenchEvent.STEP):
-      run(**inputs).numpy()
-
 if __name__ == "__main__":
  if getenv("RUN_PICKLE"):
    with open(OUTPUT, "rb") as f: pickle_loaded = load_pickle(f)
@@ -181,6 +182,3 @@ if __name__ == "__main__":
    test_vs_compile(pickle_loaded, inputs, outputs)
    if getenv("SELFTEST"):
      test_vs_onnx(inputs, outputs, onnx_file, 1e-4)
-
-  if getenv("BENCHMARK_LOG", ""):
-    bench(pickle_loaded, inputs)
@@ -0,0 +1,116 @@
+# Navi31 flash tools
+
+Utilities for reading and recovering the 2 MiB SPI flash on Navi31 boards.
+Run them from the tinygrad repository root. No image is bundled; keep a verified
+full-ROM backup before performing any write.
+
+`fw_live.py` accesses BAR5 through tinygrad's `PCIDevice.map_bar()` abstraction
+and supports either the custom ASM24 USB-PCIe bridge or native PCIe. Select the
+transport before the subcommand:
+
+```sh
+python3 extra/amdflash/fw_live.py --transport usb probe
+python3 extra/amdflash/fw_live.py --transport pci probe
+```
+
+The default, `--transport auto`, considers USB devices first and then native
+PCI devices. Native PCI access requires the usual tinygrad PCI permissions and
+an unbound kernel driver.
+
+## Access paths and hardware state
+
+The paths are state-dependent and are not interchangeable:
+
+* **`romless.py`** drives SMUIO `ROM_SW_*` directly through the ASM24 bridge.
+  Use it only when an empty or corrupt flash has stalled the PSP PBL. Healthy
+  autonomous boot gates this engine; the usual gated status is
+  `ROM_SW_STATUS=0x04000800`.
+* **`fw_live.py probe`** queries the early PSP boot-firmware mailbox.
+* Firmware-mediated write commands are retained for protocol documentation but
+  are disabled because an exact stock reflash did not validate safely.
+* **`fw_live.py dump`** reads an exact 2 MiB raw image through
+  `ROM_INDEX/ROM_DATA`. It refuses devices where the raw SMUIO controller is
+  unavailable; the NBIO SOC15 function-ROM aperture is not a physical SPI
+  mapping and is deliberately not used as a fallback.
+
+The tools do not reset or power-cycle the board.
+
+## Raw ROM_SW recovery
+
+Identification and read-only operations:
+
+```sh
+python3 extra/amdflash/romless.py info
+python3 extra/amdflash/romless.py read 0 0x40
+python3 extra/amdflash/romless.py dump spi.bin
+python3 extra/amdflash/romless.py verify known-good.bin
+```
+
+Restore an exact 2 MiB image:
+
+```sh
+python3 extra/amdflash/romless.py flash known-good.bin --yes
+```
+
+If GD25 status-register bit `SR2.CMP` protects the complete array, clearing it
+requires separate authorization:
+
+```sh
+python3 extra/amdflash/romless.py flash known-good.bin --clear-cmp --yes
+```
+
+Programming is sector-granular. Every written 4 KiB sector is immediately read
+back and compared with the input. A range can be resumed independently:
+
+```sh
+python3 extra/amdflash/romless.py flash known-good.bin \
+  --start-sector 128 --sector-count 64 --yes
+```
+
+Navi31 ROM_SW details used by the implementation:
+
+* `ROM_SW_COMMAND = (address << 8) | opcode`
+* TX data uses big-endian stream dwords
+* `RETURN_DATA_EN` (bit 19) is clear for TX and set for RX
+* the RX window exposes the preceding transaction, so reads are primed once
+
+## Firmware-mediated access
+
+The read-only commands are:
+
+```sh
+python3 extra/amdflash/fw_live.py probe
+python3 extra/amdflash/fw_live.py dump current-spi.bin
+```
+
+`dump` produces exactly `0x200000` bytes, requires the raw IFWI magic at offset
+zero, rejects mirrored 1 MiB apertures, and restores the ROM controller/index
+state before writing output.
+
+The validated early-firmware sequence is available as:
+
+```sh
+python3 extra/amdflash/fw_live.py --transport usb ifwi-all full-ifwi.bin --yes
+```
+
+It resolves at most Navi31's configured 19 items, streams the item associated
+with terminal phase `0x2xx`, and then stops. PSP selects the destination
+partition; item `0x08` always comes from the payload referenced by the first
+ISH descriptor, matching AMDVBFlash. A hard power cycle is required afterward.
+
+A successful PSP update is not a byte-identical raw rewrite. On the validated
+stock test, both A/B payloads matched the source exactly, PSP selected and
+booted the updated B partition, and firmware changed only its update cookie,
+B descriptor counter/checksum, and generated metadata near `0x1ef000`.
+
+The `stream`, `ifwi-step`, and `live-flash` commands remain disabled. Testing
+showed that the PSP live path parses a raw stock IFWI but fails with status
+`0xC` (`PSP Write To SPI Error`) after writing an `$AMDVBFL` cookie. Use the
+verified ROM_SW path for recovery.
+
+## Safety
+
+ROM_SW erase/program and `ifwi-all` commands require `--yes`; other
+firmware-streaming commands are disabled. Read-only commands still touch controller and mailbox registers but
+do not issue SPI program/erase or PSP transfer-start commands. Preserve a
+known-good full dump outside the repository.
@@ -0,0 +1,53 @@
+from __future__ import annotations
+import struct, sys, time
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[2]
+if str(ROOT) not in sys.path: sys.path.insert(0, str(ROOT))
+from tinygrad.runtime.support.usb import USB3
+from tinygrad.runtime.support.system import PCIDevice, System, USBPCIDevice
+
+USB_IDS = ((0x3801, 0x0001), (0xADD1, 0x0001))
+NAVI31_DEVICES = ((0xffff, (0x744c,)),)
+
+
+def open_gpu(index: int = 0, transport: str = 'auto') -> PCIDevice:
+  """Open an AMD GPU through tinygrad's transport-independent PCI interface."""
+  if transport not in ('auto', 'usb', 'pci'): raise ValueError(f"unsupported transport {transport!r}")
+  candidates = []
+  if transport in ('auto', 'usb'):
+    for vendor, product in USB_IDS:
+      candidates += [(USBPCIDevice, dev) for dev in USB3.list_devices(vendor, product)]
+  if transport in ('auto', 'pci'):
+    candidates += System.list_devices(0x1002, NAVI31_DEVICES)
+  if not candidates: raise RuntimeError(f"no supported {transport} AMD GPU found")
+  if not 0 <= index < len(candidates): raise RuntimeError(f"device index {index} out of range (found {len(candidates)})")
+  cls, descriptor = candidates[index]
+  return cls("AM", *descriptor) if cls is USBPCIDevice else cls("AM", descriptor)
+
+
+class MMIO:
+  """Transport-independent byte view of BAR5."""
+  def __init__(self, pci_dev: PCIDevice): self.bar = pci_dev.map_bar(5, fmt='B')
+
+  def read32(self, offset: int) -> int:
+    return struct.unpack('<I', bytes(self.bar[offset:offset+4]))[0]
+
+  def write32(self, offset: int, value: int):
+    self.write(offset, struct.pack('<I', value & 0xffffffff))
+
+  def read(self, offset: int, size: int) -> bytes:
+    return bytes(self.bar[offset:offset+size])
+
+  def write(self, offset: int, data: bytes):
+    self.bar[offset:offset+len(data)] = data
+
+
+def wait_until(fn, timeout: float, message: str, interval: float = 0.001):
+  if timeout <= 0 or timeout > 60: raise ValueError("timeout must be in (0, 60] seconds")
+  end = time.monotonic() + timeout
+  while True:
+    value = fn()
+    if value: return value
+    if time.monotonic() >= end: raise TimeoutError(message)
+    time.sleep(interval)
@@ -0,0 +1,292 @@
+#!/usr/bin/env python3
+"""Navi31 firmware-mediated flash access and ROM aperture dumping.
+
+Early item streaming must run after autonomous PSP boot but before a host
+driver or AMDev loads SOS. A fully initialized SOS rejects those commands.
+"""
+from __future__ import annotations
+import argparse, struct, sys, time
+from pathlib import Path
+from common import MMIO, open_gpu, wait_until
+
+ROM_CNTL, ROM_INDEX, ROM_DATA = 0x5A380, 0x5A390, 0x5A394
+FLASH_SIZE, INDEX_PAGE = 0x200000, 0x10000
+
+def bswap32(value: int) -> int: return int.from_bytes(value.to_bytes(4, 'little'), 'big')
+
+COMMAND_DATA, COMMAND, DOORBELL = 0x582D0, 0x582CC, 0x58224
+GET_BOOT_PARTITION, GET_FB_STATE, GET_TRANSFER_TYPE = 0x01, 0x06, 0x07
+START_TRANSFER, DATA_TRANSFER, END_TRANSFER = 0x08, 0x09, 0x0A
+SPI_GET_MODEL_ID = 0x0B
+LIVE_ADDR_LO, LIVE_ADDR_HI, LIVE_UPDATE = 0x02, 0x03, 0x04
+PSP_ERRORS = {
+  0x01: "generic error", 0x02: "out of bounds", 0x03: "invalid parameter",
+  0x04: "off-chip boot error", 0x05: "address not set", 0x06: "parse off-chip error",
+  0x07: "address map error", 0x08: "parse on-chip error", 0x09: "full update error",
+  0x0A: "partition update error", 0x0B: "map on-chip error", 0x0C: "write to SPI error",
+  0x0D: "signature validation error", 0x0E: "invalid command", 0x0F: "signature not found",
+  0x10: "state machine not initialized", 0x11: "state machine transfer error",
+  0x12: "initialization error",
+}
+
+
+class PSPFlashMailbox:
+  def __init__(self, pci_dev): self.mmio = MMIO(pci_dev)
+
+  def command(self, command: int, data: int | None = None, *, timeout: float = 10.0) -> tuple[int, int]:
+    status = self.mmio.read32(COMMAND)
+    if not status & 0x80000000:
+      raise RuntimeError(f"PSP mailbox is not ready before command {command:#x}: status={status:#010x}")
+    if data is not None: self.mmio.write32(COMMAND_DATA, data)
+    self.mmio.write32(COMMAND, command << 16)
+    self.mmio.write32(DOORBELL, 1)
+    wait_until(lambda: self.mmio.read32(COMMAND) & 0x80000000, timeout,
+               f"PSP mailbox command {command:#x} timed out")
+    value = self.mmio.read32(COMMAND)
+    return value & 0xffff, self.mmio.read32(COMMAND_DATA)
+
+  def require(self, command: int, data: int | None = None, *, timeout: float = 10.0, name: str = '') -> int:
+    error, response = self.command(command, data, timeout=timeout)
+    if error:
+      detail = PSP_ERRORS.get(error, "unknown error")
+      raise RuntimeError(f"PSP {name or hex(command)} failed: error={error:#x} ({detail})")
+    return response
+
+  def probe(self) -> dict[str, tuple[int, int]]:
+    result = {}
+    for name, command in (("boot_partition", GET_BOOT_PARTITION), ("fb_state", GET_FB_STATE),
+                          ("model_id", SPI_GET_MODEL_ID), ("transfer_type", GET_TRANSFER_TYPE)):
+      result[name] = self.command(command)
+    return result
+
+  def stream(self, payload: bytes, item_type: int, transfer_type: int | None = None):
+    if not payload: raise ValueError("payload is empty")
+    if len(payload) > 0xFFFFFF: raise ValueError("payload exceeds the mailbox's 24-bit size field")
+    if len(payload) & 3: raise ValueError("payload size must be divisible by four")
+    if not 0 <= item_type <= 0xff: raise ValueError("item type must fit in eight bits")
+    if transfer_type is None: transfer_type = self.require(GET_TRANSFER_TYPE, name="GET_TRANSFER_TYPE")
+    requested = transfer_type & 0xff
+    print(f"firmware transfer_type={transfer_type:#x}", flush=True)
+    if requested != item_type:
+      raise RuntimeError(f"firmware requests item {requested:#x}, not {item_type:#x}")
+    self.require(START_TRANSFER, (len(payload) << 8) | item_type, name="START_TRANSFER")
+    sent, started = 0, time.monotonic()
+    try:
+      for offset in range(0, len(payload), 4):
+        word = struct.unpack_from('<I', payload, offset)[0]
+        self.require(DATA_TRANSFER, word, name=f"DATA_TRANSFER@{offset:#x}")
+        sent = offset + 4
+        if sent % 0x1000 == 0:
+          print(f"{sent:#x}/{len(payload):#x} ({sent/(time.monotonic()-started)/1024:.1f} KiB/s)", flush=True)
+      self.require(END_TRANSFER, (sent << 8) | item_type, timeout=60.0, name="END_TRANSFER")
+    except BaseException:
+      # Give firmware a chance to terminate an interrupted partial session. Do
+      # not submit END_TRANSFER twice if firmware rejected the original END.
+      if sent != len(payload):
+        try: self.command(END_TRANSFER, (sent << 8) | item_type, timeout=10.0)
+        except Exception: pass
+      raise
+    print(f"stream complete: type={item_type:#x} size={sent:#x} elapsed={time.monotonic()-started:.1f}s")
+
+
+def resolve_ifwi_item(image: bytes, item_type: int) -> tuple[int, bytes]:
+  """Resolve AMDVBFlash recovery-layout item types to exact IFWI bytes."""
+  if item_type == 0x01: offset, size = 0, 0x54
+  elif item_type in (0x02, 0x03):
+    offset = 0x2000 if item_type == 0x02 else 0x3000
+    if image[offset:offset+4] != b'$PSP': raise ValueError(f"invalid PSP directory at {offset:#x}")
+    size = (struct.unpack_from('<I', image, offset + 8)[0] + 1) * 0x10
+  elif item_type == 0x04: offset, size = 0x10000, 0x1000
+  elif item_type == 0x05: offset, size = 0x11000, 0x1000
+  elif item_type == 0x06: offset, size = 0x12000, 0x20
+  elif item_type == 0x07: offset, size = 0x13000, 0x20
+  elif item_type == 0x80: offset, size = 0x1000, 4
+  elif item_type == 0x81:
+    offset = struct.unpack_from('<I', image, 0x1000)[0]
+    if image[offset:offset+4] != b'$SGN': raise ValueError("invalid $SGN table pointer")
+    size = (struct.unpack_from('<I', image, offset + 8)[0] + 1) * 0x10
+  elif 0x82 <= item_type <= 0x88:
+    table = struct.unpack_from('<I', image, 0x1000)[0]
+    if image[table:table+4] != b'$SGN': raise ValueError("invalid $SGN table pointer")
+    wanted = item_type - 0x81  # 82h..88h map to SIGN_TYPE 1..7
+    count = struct.unpack_from('<I', image, table + 8)[0]
+    entries = [struct.unpack_from('<IIII', image, table + 0x10 + i*0x10) for i in range(count)]
+    match = [entry for entry in entries if entry[0] == wanted]
+    if len(match) != 1: raise ValueError(f"missing $SGN type {wanted}")
+    _, _, size, offset = match[0]
+  elif item_type == 0x89: offset, size = 0x1f0000, 0x100
+  elif item_type == 0x08:
+    # AMDVBFlash's GetPartitionDetails follows the first ISH entry (firmware ID
+    # 0x13c) and streams its payload. PSP, not the host resolver, selects the
+    # destination partition.
+    offset = struct.unpack_from('<I', image, 0x12000 + 0x10)[0]
+    size = struct.unpack_from('<I', image, 0x12000 + 0x18)[0]
+  else:
+    raise ValueError(f"IFWI resolver does not yet support requested item {item_type:#x}")
+  payload = image[offset:offset+size]
+  if len(payload) != size: raise ValueError(f"item {item_type:#x} extends beyond IFWI")
+  print(f"resolved requested item {item_type:#x}: offset={offset:#x} size={size:#x}")
+  return offset, payload
+
+
+class LivePSPFlash:
+  """Linux psp_v13_0_update_spirom protocol, used with SOS and trained VRAM."""
+  def __init__(self, pci_dev): self.mailbox = PSPFlashMailbox(pci_dev)
+
+  def command(self, command: int, data: int | None = None, timeout: float = 10.0):
+    # Same C2PMSG registers, but the live PSP command set uses IDs 2/3/4.
+    return self.mailbox.require(command, data, timeout=timeout, name=f"LIVE_SPI_{command:#x}")
+
+  def update(self, mc_address: int):
+    status = self.mailbox.mmio.read32(COMMAND)
+    if not status & 0x80000000: raise RuntimeError(f"live PSP mailbox is not ready: {status:#x}")
+    self.command(LIVE_ADDR_LO, mc_address & 0xffffffff)
+    self.command(LIVE_ADDR_HI, mc_address >> 32)
+    self.command(LIVE_UPDATE, timeout=60.0)
+
+
+def open_mailbox(args): return PSPFlashMailbox(open_gpu(args.device, args.transport))
+
+
+def reject_unvalidated_firmware_write():
+  raise RuntimeError("firmware writes are disabled: stock reflash validation failed; use romless.py for recovery")
+
+
+def cmd_probe(args):
+  result = open_mailbox(args).probe()
+  for name, (error, response) in result.items(): print(f"{name}: error={error:#x} response={response:#x}")
+  if result['transfer_type'][0] == 0xA: print("update commands gated: reset card and do not initialize AMDev/SOS", file=sys.stderr)
+
+
+def cmd_stream(args):
+  if not args.yes: raise RuntimeError("refusing to stream without --yes")
+  reject_unvalidated_firmware_write()
+  payload = Path(args.image).read_bytes()
+  open_mailbox(args).stream(payload, args.item_type)
+
+
+def cmd_ifwi_step(args):
+  if not args.yes: raise RuntimeError("refusing to stream without --yes")
+  reject_unvalidated_firmware_write()
+  image = Path(args.ifwi).read_bytes()
+  if len(image) != 0x200000: raise ValueError("Navi31 IFWI image must be exactly 2 MiB")
+  mailbox = open_mailbox(args)
+  state = mailbox.require(GET_TRANSFER_TYPE, name="GET_TRANSFER_TYPE")
+  request = state & 0xff
+  _, payload = resolve_ifwi_item(image, request)
+  mailbox.stream(payload, request, transfer_type=state)
+  next_request = mailbox.require(GET_TRANSFER_TYPE, name="GET_TRANSFER_TYPE")
+  print(f"next firmware transfer_type={next_request:#x}")
+
+
+def cmd_ifwi_all(args):
+  if not args.yes: raise RuntimeError("refusing to stream without --yes")
+  image = Path(args.ifwi).read_bytes()
+  if len(image) != 0x200000: raise ValueError("Navi31 IFWI image must be exactly 2 MiB")
+  mailbox = open_mailbox(args)
+  current = mailbox.require(GET_TRANSFER_TYPE, name="GET_TRANSFER_TYPE")
+  for step in range(19):  # Navi31 ROMItemCount from AMDVBFlash ASICDetails.xml
+    request, phase = current & 0xff, current >> 8
+    print(f"IFWI step {step}: state={current:#x} item={request:#x} phase={phase}", flush=True)
+    _, payload = resolve_ifwi_item(image, request)
+    mailbox.stream(payload, request, transfer_type=current)
+    # AMDVBFlash tests the high byte belonging to the item just streamed. Phase
+    # 2 terminates the loop only after that item has completed successfully.
+    if phase == 2:
+      print(f"IFWI stream complete after terminal state {current:#x}; hard power cycle required")
+      return
+    current = mailbox.require(GET_TRANSFER_TYPE, name="GET_TRANSFER_TYPE")
+  raise RuntimeError(f"IFWI stream did not reach terminal phase after 19 items (state={current:#x})")
+
+
+def cmd_live_flash(args):
+  if not args.yes: raise RuntimeError("refusing to flash without --yes")
+  reject_unvalidated_firmware_write()
+  image = Path(args.ifwi).read_bytes()
+  if not image or len(image) > 16 * 1024 * 1024 or len(image) & 3:
+    raise ValueError("live PSP image must be non-empty, 4-byte aligned, and at most 16 MiB")
+  pci_dev = open_gpu(args.device, args.transport)
+  from tinygrad.runtime.support.am.amdev import AMDev
+  started = time.monotonic()
+  adev = AMDev(pci_dev)
+  print(f"AMDev booted, SOS alive={adev.psp.is_sos_alive()}", flush=True)
+  paddr = adev.mm.palloc(len(image), align=0x1000, zero=False)
+  try:
+    adev.vram.view(paddr, len(image), 'B')[:] = image
+    adev.gmc.flush_hdp()
+    mc_address = adev.paddr2mc(paddr)
+    print(f"staged IFWI at VRAM paddr={paddr:#x} mc={mc_address:#x}", flush=True)
+    LivePSPFlash(pci_dev).update(mc_address)
+    print(f"live PSP flash update complete in {time.monotonic()-started:.1f}s")
+  finally:
+    adev.mm.pfree(paddr)
+
+
+def cmd_dump(args):
+  import hashlib
+  pci_dev = open_gpu(args.device, args.transport)
+  mmio, output, started = MMIO(pci_dev), bytearray(), time.monotonic()
+  original_cntl, original_index = mmio.read32(ROM_CNTL), mmio.read32(ROM_INDEX)
+  if original_cntl == 0xFFFFFFFF:
+    raise RuntimeError("raw SMUIO ROM controller is unavailable; the SOC15 function-ROM aperture is not a raw SPI dump")
+  try:
+    # ROM_DATA must be read one dword at a time; a block read increments MMIO
+    # addresses rather than repeatedly reading the flash aperture register.
+    mmio.write32(ROM_CNTL, bswap32(original_cntl | (1 << 29)))
+    for page in range(0, FLASH_SIZE, INDEX_PAGE):
+      mmio.write32(ROM_INDEX, bswap32(page >> 8))
+      for _ in range(INDEX_PAGE // 4): output += struct.pack('<I', mmio.read32(ROM_DATA))
+      print(f"{page+INDEX_PAGE:#08x}/{FLASH_SIZE:#08x}", flush=True)
+  finally:
+    mmio.write32(ROM_INDEX, bswap32(original_index))
+    mmio.write32(ROM_CNTL, bswap32(original_cntl))
+  if len(output) != FLASH_SIZE or output[:4] != b'\xaa\x55\xaa\x55':
+    raise RuntimeError(f"invalid raw flash dump: size={len(output):#x} magic={output[:4].hex()}")
+  if output[:FLASH_SIZE//2] == output[FLASH_SIZE//2:]:
+    raise RuntimeError("ROM aperture contains mirrored 1 MiB halves; refusing to write a non-raw 2 MiB dump")
+  Path(args.output).write_bytes(output)
+  print(f"dumped {len(output):#x} bytes in {time.monotonic()-started:.1f}s sha256={hashlib.sha256(output).hexdigest()}")
+
+
+def parser():
+  p = argparse.ArgumentParser(description=__doc__)
+  p.add_argument('--device', type=int, default=0, help='device index for the selected transport')
+  p.add_argument('--transport', choices=('auto', 'usb', 'pci'), default='auto', help='PCIe transport (default: USB first, then native PCI)')
+  sub = p.add_subparsers(dest='command', required=True)
+  sub.add_parser('probe', help='query firmware mailbox state without writing').set_defaults(func=cmd_probe)
+
+  s = sub.add_parser('stream', help='stream one exact PSP ROM-item payload')
+  s.add_argument('item_type', type=lambda x:int(x, 0))
+  s.add_argument('image')
+  s.add_argument('--yes', action='store_true')
+  s.set_defaults(func=cmd_stream)
+
+  v = sub.add_parser('ifwi-step', help='resolve and stream the next early-firmware-requested item from a 2 MiB IFWI')
+  v.add_argument('ifwi')
+  v.add_argument('--yes', action='store_true')
+  v.set_defaults(func=cmd_ifwi_step)
+
+  a = sub.add_parser('ifwi-all', help='stream requested IFWI items until firmware reports completion')
+  a.add_argument('ifwi')
+  a.add_argument('--yes', action='store_true')
+  a.set_defaults(func=cmd_ifwi_all)
+
+  l = sub.add_parser('live-flash', help='stage an image in VRAM and invoke the PSP v13 live-update command')
+  l.add_argument('ifwi')
+  l.add_argument('--yes', action='store_true')
+  l.set_defaults(func=cmd_live_flash)
+
+  d = sub.add_parser('dump', help='dump the exact 2 MiB flash through ROM_INDEX/ROM_DATA')
+  d.add_argument('output')
+  d.set_defaults(func=cmd_dump)
+  return p
+
+
+def main():
+  args = parser().parse_args()
+  try: args.func(args)
+  except (RuntimeError, TimeoutError, ValueError, OSError) as error:
+    print(f"error: {error}", file=sys.stderr)
+    raise SystemExit(1)
+
+if __name__ == '__main__': main()
@@ -0,0 +1,249 @@
+#!/usr/bin/env python3
+"""Direct Navi31 ROM_SW access for GD25LQ16E-class 2 MiB SPI flash."""
+from __future__ import annotations
+import argparse, hashlib, sys, time
+from pathlib import Path
+from common import MMIO, open_gpu, wait_until
+
+FLASH_SIZE, SECTOR_SIZE, PAGE_SIZE, MAX_DATA = 0x200000, 0x1000, 0x100, 0x100
+ROM_CNTL, PAGE_MIRROR_CNTL = 0x5A380, 0x5A384
+ROM_SW_CNTL, ROM_SW_STATUS, ROM_SW_COMMAND, ROM_SW_DATA = 0x5A3A0, 0x5A3A4, 0x5A3A8, 0x5A3B0
+GPIO_PAD_MASK, GPIO_PAD_A, GPIO_PAD_EN = 0x5A504, 0x5A508, 0x5A510
+SPI_GPIO_BITS, RETURN_DATA_EN = 0x780, 0x80000
+EXPECTED_JEDEC = b'\xc8\x60\x15'
+
+
+class Navi31SPI:
+  def __init__(self, pci_dev, prescale: int = 8):
+    if not 0 <= prescale <= 15: raise ValueError("prescale must be 0..15")
+    self.mmio = MMIO(pci_dev)
+    rc = self.mmio.read32(ROM_CNTL)
+    # Select the prescaler instead of inheriting a potentially unusable BL value.
+    self.mmio.write32(ROM_CNTL, (rc & 0xE0FFFFFF) | (1 << 28) | (prescale << 24) | 1)
+
+  def transfer(self, opcode: int, *, address: int = 0, address_len: int = 0,
+               data_out: bytes = b'', data_in: int = 0, timeout: float = 2.0) -> bytes:
+    if data_out and data_in: raise ValueError("simultaneous TX and RX is unsupported")
+    if not 0 <= address_len <= 3: raise ValueError("address_len must be 0..3")
+    count = len(data_out) if data_out else data_in
+    if not 0 <= count <= MAX_DATA: raise ValueError(f"transfer data must be <= {MAX_DATA} bytes")
+    ncmd = 1 + address_len
+    m = self.mmio
+    gpio_mask, gpio_a, gpio_en = m.read32(GPIO_PAD_MASK), m.read32(GPIO_PAD_A), m.read32(GPIO_PAD_EN)
+    page_mirror, rom_cntl = m.read32(PAGE_MIRROR_CNTL), m.read32(ROM_CNTL)
+    try:
+      m.write32(GPIO_PAD_MASK, gpio_mask & ~SPI_GPIO_BITS)
+      m.write32(GPIO_PAD_A, gpio_a & ~SPI_GPIO_BITS)
+      m.write32(GPIO_PAD_EN, gpio_en & ~SPI_GPIO_BITS)
+      m.write32(PAGE_MIRROR_CNTL, (page_mirror & 0xF1FFFFFF) | 0x06000000)
+      m.write32(ROM_CNTL, (rom_cntl & ~0xF) | 8)
+      m.write32(ROM_SW_CNTL, 0)
+      m.write32(ROM_SW_STATUS, 0)
+      if m.read32(ROM_SW_STATUS) != 0: raise RuntimeError("ROM_SW_STATUS did not clear")
+
+      # Navi31 serializes the low instruction byte first, followed by ADDRESS[23:0].
+      m.write32(ROM_SW_COMMAND, ((address & 0xFFFFFF) << 8) | (opcode & 0xFF))
+      for offset in range(0, len(data_out), 4):
+        word = data_out[offset:offset+4].ljust(4, b'\0')
+        m.write32(ROM_SW_DATA + offset, int.from_bytes(word, 'big'))
+
+      control = ((ncmd - 1) << 16) | (RETURN_DATA_EN if data_in else 0) | count
+      m.write32(ROM_SW_CNTL, control)
+      m.read32(ROM_SW_CNTL)  # posted-write flush
+      wait_until(lambda: m.read32(ROM_SW_STATUS) & 1, timeout,
+                 f"ROM_SW transaction timeout (status={m.read32(ROM_SW_STATUS):#x}); engine may be gated after SOS boot")
+      return m.read(ROM_SW_DATA, (data_in + 3) & ~3)[:data_in] if data_in else b''
+    finally:
+      m.write32(ROM_SW_CNTL, 0)
+      m.write32(ROM_SW_STATUS, 0)
+      m.write32(ROM_CNTL, rom_cntl)
+      m.write32(PAGE_MIRROR_CNTL, page_mirror)
+      m.write32(GPIO_PAD_A, gpio_a)
+      m.write32(GPIO_PAD_EN, gpio_en)
+      m.write32(GPIO_PAD_MASK, gpio_mask)
+
+
+class GD25LQ16E:
+  def __init__(self, spi: Navi31SPI): self.spi = spi
+
+  def read_register(self, opcode: int, count: int = 1) -> bytes:
+    # Navi31 exposes the preceding transaction's RX capture. Prime identically.
+    self.spi.transfer(opcode, data_in=max(2, count))
+    return self.spi.transfer(opcode, data_in=count)
+
+  def status(self, opcode: int = 0x05) -> int: return self.read_register(opcode)[0]
+  def rdid(self) -> bytes: return self.read_register(0x9F, 4)
+
+  def sfdp(self, count: int = 20) -> bytes:
+    # 5Ah has one dummy byte after its 24-bit address; retain it for diagnostics.
+    self.spi.transfer(0x5A, address_len=3, data_in=count)
+    return self.spi.transfer(0x5A, address_len=3, data_in=count)
+
+  def wait_idle(self, timeout: float = 2.0) -> int:
+    end = time.monotonic() + timeout
+    while time.monotonic() < end:
+      sr1 = self.status()
+      if not sr1 & 1: return sr1
+      time.sleep(0.002)
+    raise TimeoutError(f"flash remained busy for {timeout}s")
+
+  def write_enable(self):
+    self.spi.transfer(0x06)
+    sr1 = self.status()
+    if not sr1 & 2: raise RuntimeError(f"WREN failed (SR1={sr1:#04x})")
+
+  def clear_cmp(self):
+    sr1, sr2 = self.status(), self.status(0x35)
+    if not sr2 & 0x40: return False
+    self.write_enable()
+    # BUSY/WEL are not writable; preserve all protection/QE fields except CMP.
+    self.spi.transfer(0x01, data_out=bytes((sr1 & 0xFC, sr2 & ~0x40)))
+    self.wait_idle(1.0)
+    new_sr2 = self.status(0x35)
+    if new_sr2 & 0x40: raise RuntimeError(f"failed to clear CMP (SR2={new_sr2:#04x})")
+    return True
+
+  def erase_sector(self, address: int):
+    if address & (SECTOR_SIZE - 1): raise ValueError("sector address is not 4 KiB aligned")
+    self.write_enable()
+    self.spi.transfer(0x20, address=address, address_len=3)
+    self.wait_idle(2.0)
+
+  def program_page(self, address: int, data: bytes):
+    if not data or len(data) > PAGE_SIZE or (address & 0xFF) + len(data) > PAGE_SIZE:
+      raise ValueError("page program crosses a 256-byte boundary")
+    self.write_enable()
+    self.spi.transfer(0x02, address=address, address_len=3, data_out=data)
+    self.wait_idle(1.0)
+
+  def read(self, address: int, count: int) -> bytes:
+    if address < 0 or count < 0 or address + count > FLASH_SIZE: raise ValueError("read outside 2 MiB flash")
+    output = bytearray()
+    while count:
+      size = min(count, MAX_DATA)
+      self.spi.transfer(0x03, address=address, address_len=3, data_in=size)
+      output += self.spi.transfer(0x03, address=address, address_len=3, data_in=size)
+      address, count = address + size, count - size
+    return bytes(output)
+
+
+def has_jedec(raw: bytes) -> bool:
+  return EXPECTED_JEDEC in raw + raw[:2]
+
+
+def open_flash(args) -> GD25LQ16E:
+  flash = GD25LQ16E(Navi31SPI(open_gpu(args.device, 'usb'), args.prescale))
+  raw = flash.rdid()
+  if not has_jedec(raw): raise RuntimeError(f"unexpected GD25LQ16E JEDEC capture: {raw.hex()}")
+  return flash
+
+
+def cmd_info(args):
+  f = open_flash(args)
+  sr1, sr2, sr3 = f.status(), f.status(0x35), f.status(0x15)
+  sfdp = f.sfdp(24)
+  pos = sfdp.find(b'SFDP')
+  print(f"JEDEC capture: {f.rdid().hex()} (C8 60 15 detected)")
+  print(f"SR1/SR2/SR3: {sr1:02x}/{sr2:02x}/{sr3:02x}  CMP={'set' if sr2 & 0x40 else 'clear'}")
+  print(f"SFDP capture: {sfdp.hex()}  signature_offset={pos}")
+
+
+def cmd_read(args):
+  data = open_flash(args).read(args.address, args.size)
+  if args.output: Path(args.output).write_bytes(data)
+  else: print(data.hex())
+
+
+def cmd_dump(args):
+  f = open_flash(args)
+  out = Path(args.output)
+  digest = hashlib.sha256()
+  with out.open('wb') as file:
+    for address in range(0, FLASH_SIZE, SECTOR_SIZE):
+      data = f.read(address, SECTOR_SIZE)
+      file.write(data)
+      digest.update(data)
+      if not (address & 0xFFFF): print(f"{address + SECTOR_SIZE:#08x}/{FLASH_SIZE:#08x}", flush=True)
+  print(f"wrote {out} sha256={digest.hexdigest()}")
+
+
+def cmd_verify(args):
+  expected = Path(args.image).read_bytes()
+  if len(expected) != FLASH_SIZE: raise ValueError(f"image must be exactly {FLASH_SIZE:#x} bytes")
+  f = open_flash(args)
+  digest = hashlib.sha256()
+  for address in range(0, FLASH_SIZE, SECTOR_SIZE):
+    got, wanted = f.read(address, SECTOR_SIZE), expected[address:address+SECTOR_SIZE]
+    digest.update(got)
+    if got != wanted:
+      index = next(i for i, (a, b) in enumerate(zip(got, wanted)) if a != b)
+      raise RuntimeError(f"verify mismatch at {address+index:#x}: flash={got[index]:02x} image={wanted[index]:02x}")
+  print(f"verified {FLASH_SIZE:#x} bytes sha256={digest.hexdigest()}")
+
+
+def cmd_flash(args):
+  if not args.yes: raise RuntimeError("refusing to write without --yes")
+  image = Path(args.image).read_bytes()
+  if len(image) != FLASH_SIZE: raise ValueError(f"image must be exactly {FLASH_SIZE:#x} bytes")
+  total_sectors = FLASH_SIZE // SECTOR_SIZE
+  start, count = args.start_sector, args.sector_count if args.sector_count is not None else total_sectors - args.start_sector
+  if not 0 <= start < total_sectors or not 1 <= count <= total_sectors - start: raise ValueError("invalid sector range")
+  f = open_flash(args)
+  if f.status(0x35) & 0x40:
+    if not args.clear_cmp: raise RuntimeError("CMP protects the full array; rerun with --clear-cmp")
+    f.clear_cmp()
+    print("cleared SR2.CMP", flush=True)
+  begin = time.monotonic()
+  for sector in range(start, start + count):
+    address = sector * SECTOR_SIZE
+    wanted = image[address:address+SECTOR_SIZE]
+    f.erase_sector(address)
+    for offset in range(0, SECTOR_SIZE, PAGE_SIZE):
+      page = wanted[offset:offset+PAGE_SIZE]
+      if page != b'\xff' * PAGE_SIZE: f.program_page(address + offset, page)
+    got = f.read(address, SECTOR_SIZE)
+    if got != wanted:
+      index = next(i for i, (a, b) in enumerate(zip(got, wanted)) if a != b)
+      raise RuntimeError(f"verify mismatch at {address+index:#x}: flash={got[index]:02x} image={wanted[index]:02x}")
+    print(f"OK sector {sector:03d}/{total_sectors-1} @{address:#07x} elapsed={time.monotonic()-begin:.1f}s", flush=True)
+
+
+def parser():
+  p = argparse.ArgumentParser(description=__doc__)
+  p.add_argument('--device', type=int, default=0, help='USB bridge device index')
+  p.add_argument('--prescale', type=int, default=8, help='SCK prescaler 0..15 (default: 8)')
+  sub = p.add_subparsers(dest='command', required=True)
+  sub.add_parser('info', help='read JEDEC, status and SFDP').set_defaults(func=cmd_info)
+
+  r = sub.add_parser('read', help='read a flash range')
+  r.add_argument('address', type=lambda x:int(x, 0))
+  r.add_argument('size', type=lambda x:int(x, 0))
+  r.add_argument('-o', '--output')
+  r.set_defaults(func=cmd_read)
+
+  d = sub.add_parser('dump', help='dump the complete 2 MiB flash')
+  d.add_argument('output')
+  d.set_defaults(func=cmd_dump)
+
+  v = sub.add_parser('verify', help='compare the complete flash with an image')
+  v.add_argument('image')
+  v.set_defaults(func=cmd_verify)
+
+  w = sub.add_parser('flash', help='erase, program, and verify one or more sectors')
+  w.add_argument('image')
+  w.add_argument('--start-sector', type=lambda x:int(x, 0), default=0)
+  w.add_argument('--sector-count', type=lambda x:int(x, 0))
+  w.add_argument('--clear-cmp', action='store_true')
+  w.add_argument('--yes', action='store_true')
+  w.set_defaults(func=cmd_flash)
+  return p
+
+
+def main():
+  args = parser().parse_args()
+  try: args.func(args)
+  except (RuntimeError, TimeoutError, ValueError, OSError) as error:
+    print(f"error: {error}", file=sys.stderr)
+    raise SystemExit(1)
+
+if __name__ == '__main__': main()
@@ -66,6 +66,8 @@ class AMSMI(AMDev):
  def __init__(self, pcibus, vram_bar:MMIOInterface, doorbell_bar:MMIOInterface, mmio_bar:MMIOInterface):
    self.pcibus, self.devfmt = pcibus, pcibus
    self.vram, self.doorbell64, self.mmio = vram_bar, doorbell_bar, mmio_bar
+    self.is_vf = bool(self.mmio[am.mmRCC_IOV_FUNC_IDENTIFIER] & 1)
+    self.vf_rlc_gated:list[tuple[int, int]] = []
    self.pci_state = self.read_pci_state()
    if self.pci_state == "D0": self._init_from_d0()

@@ -84,7 +86,8 @@ class AMSMI(AMDev):
    with open(f"/sys/bus/pci/devices/{self.pcibus}/power_state", "r") as f: return f.read().strip().rstrip()

 class SMICtx:
-  def __init__(self):
+  def __init__(self, dev_filter=None):
+    self.dev_filter = dev_filter
    self.devs = []
    self.opened_pcidevs = []
    self.opened_pci_resources = {}
@@ -135,6 +138,7 @@ class SMICtx:
    pattern = os.path.join('/tmp', 'am_*.lock')
    for d in [f[8:-5] for f in glob.glob(pattern)]:
      if d.startswith("usb"): continue
+      if self.dev_filter is not None and d != self.dev_filter: continue
      if d not in self.opened_pcidevs:
        self._open_am_device(d)

@@ -406,7 +410,7 @@ if __name__ == "__main__":

  try:
    if not args.list: os.system('clear')
-    smi_ctx = SMICtx()
+    smi_ctx = SMICtx(args.dev)
    while True:
      smi_ctx.rescan_devs()
      smi_ctx.draw(args.list)
@@ -35,7 +35,7 @@ class WallTimeEvent:
    return self
  def __exit__(self, *_):
    self.time = time.monotonic() - self.start
-    _events[self.event]["wall"].append(self.time)
+    _events[self.event]["wall"].append((self.time, BENCHMARK_LOG.value))
    return False

 class KernelTimeEvent:
@@ -47,19 +47,19 @@ class KernelTimeEvent:
    self.start = GlobalCounters.time_sum_s
    return self
  def __exit__(self, *_):
-    _events[self.event]["kernel"].append(GlobalCounters.time_sum_s - self.start)
+    _events[self.event]["kernel"].append((GlobalCounters.time_sum_s - self.start, BENCHMARK_LOG.value))
    return False

 def log_event_instant(event:InstantBenchEvent, value:float):
-  _events[event].append(value)
+  _events[event].append((value, BENCHMARK_LOG.value))

 if BENCHMARK_LOG:
  INFLUXDB_HOST = getenv("INFLUXDB_HOST", "")
  INFLUXDB_ORG = getenv("INFLUXDB_ORG", "tiny")
  INFLUXDB_TOKEN = getenv("INFLUXDB_TOKEN", "")

-  def _create_point(run_id, i, attempt, ref, commit, name, value, run):
-    point = Point(BENCHMARK_LOG.value).tag("id", run_id).tag("index", i)
+  def _create_point(run_id, i, attempt, ref, commit, name, value, log_name, run):
+    point = Point(log_name.replace(':', '_').replace('.', '_')).tag("id", run_id).tag("index", i)
    point = point.tag("device", Device.DEFAULT)
    point = point.tag("attempt", attempt).tag("ref", ref).tag("commit", commit)
    point = point.field(name, value).field("x", run)
@@ -91,12 +91,12 @@ if BENCHMARK_LOG:
      run_id = str(uuid.uuid4())
      if isinstance(event, BenchEvent):
        for event_type, values in _events[event].items():
-          for i, value in enumerate(values):
-            point = _create_point(run_id, i, attempt, ref, commit, f"{event.value}_{event_type}", value, run)
+          for i, (value, log_name) in enumerate(values):
+            point = _create_point(run_id, i, attempt, ref, commit, f"{event.value}_{event_type}", value, log_name, run)
            points.append(point)
      else:
-        for i, value in enumerate(_events[event]):
-          point = _create_point(run_id, i, attempt, ref, commit, event.value, value, run)
+        for i, (value, log_name) in enumerate(_events[event]):
+          point = _create_point(run_id, i, attempt, ref, commit, event.value, value, log_name, run)
          points.append(point)

    write_options = WriteOptions(write_type=WriteType.synchronous, retry_interval=5000, max_retries=5, max_retry_delay=30000, exponential_base=2)
@@ -0,0 +1,238 @@
+import ctypes, struct
+from tinygrad.helpers import ceildiv, getenv, wait_cond, DEBUG
+from tinygrad.runtime.autogen import bnxt, pci
+from tinygrad.runtime.support.system import PCIDevice, System, ipv4_to_gid
+
+BNXT_DEBUG = getenv("BNXT_DEBUG", 0)
+BNXT_ACCESS, BNXT_INIT_MASK, BNXT_RTR_MASK, BNXT_RTS_MASK = 3, 0xd, 0x41515ad, 0xae005
+BNXT_CHIMP_COMM, BNXT_CHIMP_COMM_TRIGGER = 0x0, 0x100
+BNXT_BACKING_STORE = ((0, 2), (1, 0), (2, 2), (3, 0), (4, 2), (5, 0), (6, 0), (14, 2), (15, 0))
+
+def db_value(xid, typ, index, epoch):
+  return (xid & bnxt.DBC_DBC_XID_MASK | bnxt.DBC_DBC_PATH_ROCE | typ | bnxt.BNXT_QPLIB_DBR_VALID) << 32 | \
+         index & bnxt.DBC_DBC_INDEX_MASK | epoch << bnxt.BNXT_QPLIB_DBR_EPOCH_SHIFT
+
+def _pbl(dev, paddrs, queue=False):
+  if len(paddrs) == 1: return 0, paddrs[0]
+  values = [p | bnxt.PTU_PTE_VALID for p in paddrs]
+  if queue:
+    values[-1] |= bnxt.PTU_PTE_LAST
+    if len(values) > 1: values[-2] |= bnxt.PTU_PTE_NEXT_TO_LAST
+  table, table_paddrs = dev.pci_dev.alloc_sysmem(ceildiv(len(values), 512) * 0x1000)
+  table[:len(values) * 8] = struct.pack(f"<{len(values)}Q", *values)
+  if len(table_paddrs) == 1: return 1, table_paddrs[0]
+  top, top_paddrs = dev.pci_dev.alloc_sysmem(0x1000)
+  top[:len(table_paddrs) * 8] = struct.pack(f"<{len(table_paddrs)}Q", *(p | bnxt.PTU_PTE_VALID for p in table_paddrs))
+  return 2, top_paddrs[0]
+
+def _queue(dev, stride:int=16, aux=False):
+  mem, paddrs = dev.pci_dev.alloc_sysmem(0x1000 + aux * 0x400)
+  level, base = _pbl(dev, paddrs, queue=True)
+  return {"mem":mem, "paddrs":paddrs, "stride":stride, "prod":0, "cons":0, "level":level, "base":base}
+
+def _qread(q, i):
+  off = (i & 15) * q["stride"]
+  return q["mem"][off:off + q["stride"]]
+
+def _qwrite(q, i, data, aux=False):
+  off = 0x1000 + i % 128 * 8 if aux else (i & 15) * q["stride"]
+  q["mem"][off:off + len(data)] = data
+
+class BNXTDev:
+  def __init__(self, pci_dev:PCIDevice, ip:str=getenv("BNXT_IP", "10.0.0.1")):
+    self.pci_dev, self.devfmt = pci_dev, pci_dev.pcibus
+    self.bar0, self.db = pci_dev.map_bar(0, fmt='I'), pci_dev.map_bar(2, fmt='Q')
+    pci_dev.write_config(pci.PCI_COMMAND, pci_dev.read_config(pci.PCI_COMMAND, 2) | pci.PCI_COMMAND_MASTER, 2)
+    self.resp, self.resp_pa = pci_dev.alloc_sysmem(0x1000)
+    self.seq = 0
+
+    ver = self.hwrm("ver_get")
+    if DEBUG >= 2: print(f"bnxt {self.devfmt}: firmware {ver.hwrm_fw_maj_8b}.{ver.hwrm_fw_min_8b}.{ver.hwrm_fw_bld_8b}")
+    self.hwrm("func_reset", timeout_ms=40000)
+    caps = self.hwrm("func_qcaps", fid=0xffff)
+    self.mac, self.port_id = int.from_bytes(bytes(caps.mac_address), 'big'), caps.port_id
+    self.hwrm("func_drv_rgtr")
+    self.db_off = self.hwrm("func_qcfg", fid=0xffff).legacy_l2_db_size_kb * 1024
+
+    self.setup_backing_store()
+    self._open_rcfw()
+    self._open_l2()
+    self.local_gid = ipv4_to_gid(ip)
+    gids, mac = (ctypes.c_uint32 * 4)(*(int.from_bytes(self.local_gid[i:i + 4], 'big') for i in (12, 8, 4, 0))), self.mac.to_bytes(6, 'big')
+    smac = (ctypes.c_uint16 * 3)(*(int.from_bytes(mac[i:i + 2], 'big') for i in (0, 2, 4)))
+    self.gid_id = self.rcfw("add_gid", gid=gids, src_mac=smac).xid
+
+    if DEBUG >= 2: print(f"bnxt {self.devfmt}: booted mac={self.mac.to_bytes(6, 'big').hex(':')} gid={self.local_gid.hex()}")
+
+  def hwrm(self, name, timeout_ms=10000, **fields):
+    inp, out = getattr(bnxt, f"struct_hwrm_{name}_input"), getattr(bnxt, f"struct_hwrm_{name}_output")
+    opcode = getattr(bnxt, f"HWRM_{name.upper()}")
+    self.seq = (self.seq + 1) & 0xffff
+    data = bytes(inp(req_type=opcode, cmpl_ring=bnxt.BNXT_HWRM_NO_CMPL_RING, seq_id=self.seq, target_id=bnxt.BNXT_HWRM_TARGET,
+                     resp_addr=self.resp_pa[0], **fields))
+    self.resp[:] = bytes(len(self.resp))
+    System.memory_barrier()
+    for i, w in enumerate(memoryview(bytearray(data.ljust(bnxt.HWRM_MAX_REQ_LEN, b'\0'))).cast('I')):
+      self.bar0[BNXT_CHIMP_COMM // 4 + i] = w
+    self.bar0[BNXT_CHIMP_COMM_TRIGGER // 4] = 1
+    def hdr(): return bnxt.struct_hwrm_resp_hdr.from_buffer_copy(bytes(self.resp[:8]))
+    wait_cond(lambda: (n := hdr().resp_len) and hdr().seq_id == self.seq and self.resp[n - 1], timeout_ms=timeout_ms, msg=f"HWRM {name}")
+    ret = out.from_buffer_copy(bytes(self.resp[:ctypes.sizeof(out)]))
+    assert ret.error_code == 0, f"HWRM {name}: {ret.error_code}"
+    return ret
+
+  def setup_backing_store(self):
+    counts: dict[int, int] = {}
+    for typ, extra in BNXT_BACKING_STORE:
+      caps = self.hwrm("func_backing_store_qcaps_v2", type=typ)
+      size, splits = caps.entry_size, tuple(getattr(caps, f"split_entry_{j}") for j in range(caps.subtype_valid_cnt))
+      counts[typ] = n = counts[0] if typ == 15 else max(caps.min_num_entries, sum(splits) + extra)
+      # a zero bitmap means the type has a single instance 0
+      for instance in [i for i in range(8) if caps.instance_bit_map >> i & 1] or [0]:
+        mem, paddrs = self.pci_dev.alloc_sysmem(ceildiv(n * size, 0x1000) * 0x1000)
+        if caps.ctx_init_value:
+          for off in range(caps.ctx_init_offset, len(mem), size): mem[off] = caps.ctx_init_value
+        lvl, base = _pbl(self, paddrs)
+        self.hwrm("func_backing_store_cfg_v2", type=typ, instance=instance, entry_size=size, num_entries=n, page_dir=base,
+          page_size_pbl_level=lvl, subtype_valid_cnt=len(splits),
+          flags=bnxt.FUNC_BACKING_STORE_CFG_V2_REQ_FLAGS_BS_CFG_ALL_DONE if typ == 15 else 0,
+          **{f"split_entry_{j}": v for j, v in enumerate(splits)})
+
+  def _open_rcfw(self):
+    self.rcfw_first = True
+
+    self.creq = _queue(self)
+    self.creq_id = self.hwrm("ring_alloc", ring_type=bnxt.RING_ALLOC_REQ_RING_TYPE_NQ, page_tbl_addr=self.creq["base"],
+      page_size=12, page_tbl_depth=self.creq["level"], length=16, int_mode=bnxt.RING_ALLOC_REQ_INT_MODE_MSIX).ring_id
+
+    self.cmdq = _queue(self)
+    self.doorbell(self.creq_id, bnxt.DBC_DBC_TYPE_NQ_ARM, 0, 0)
+    init = bnxt.struct_cmdq_init(cmdq_pbl=self.cmdq["base"], creq_ring_id=self.creq_id,
+                                 cmdq_size_cmdq_lvl=16 << bnxt.CMDQ_INIT_CMDQ_SIZE_SFT)
+
+    System.memory_barrier()
+    for i, w in enumerate(memoryview(bytearray(bytes(init))).cast('I')): self.bar0[bnxt.RCFW_COMM_BASE_OFFSET // 4 + i] = w
+
+    _, p = self.pci_dev.alloc_sysmem(0x1000)
+    self.rcfw("initialize_fw", stat_ctx_id=self.hwrm("stat_ctx_alloc", stats_dma_addr=p[0], stats_dma_length=176).stat_ctx_id,
+      flags=bnxt.CMDQ_INITIALIZE_FW_FLAGS_HW_REQUESTER_RETX_SUPPORTED)
+
+    # RoCE notification ring: never armed or serviced, but CQ and L2 ring allocation require one
+    nq = _queue(self)
+    self.nq_id = self.hwrm("ring_alloc", ring_type=bnxt.RING_ALLOC_REQ_RING_TYPE_NQ, page_tbl_addr=nq["base"],
+      page_size=12, page_tbl_depth=nq["level"], length=16, logical_id=1, int_mode=bnxt.RING_ALLOC_REQ_INT_MODE_MSIX).ring_id
+
+  def rcfw(self, name, timeout_ms=20000, **fields):
+    req_t, resp_t = getattr(bnxt, f"struct_cmdq_{name}"), getattr(bnxt, f"struct_creq_{name}_resp")
+    op = getattr(bnxt, f"CMDQ_BASE_OPCODE_{name.upper()}")
+    data = bytes(req_t(opcode=op, cmd_size=(slots := ceildiv(ctypes.sizeof(req_t), 16)), **fields)).ljust(slots * 16, b'\0')
+    for i in range(slots): _qwrite(self.cmdq, self.cmdq["prod"] + i, data[i * 16:(i + 1) * 16])
+
+    self.cmdq["prod"] += slots
+    prod = self.cmdq["prod"] & 0xffff
+    if self.rcfw_first: prod, self.rcfw_first = prod | 1 << bnxt.FIRMWARE_FIRST_FLAG, False
+
+    System.memory_barrier()
+
+    self.bar0[(bnxt.RCFW_COMM_BASE_OFFSET + bnxt.RCFW_PF_VF_COMM_PROD_OFFSET) // 4] = prod
+    self.bar0[(bnxt.RCFW_COMM_BASE_OFFSET + bnxt.RCFW_COMM_TRIG_OFFSET) // 4] = bnxt.RCFW_CMDQ_TRIG_VAL
+
+    def poll():
+      h = bnxt.struct_creq_base.from_buffer_copy(bytes(_qread(self.creq, self.creq["cons"])))
+      return bool(h.v & bnxt.CREQ_BASE_V) != bool((self.creq["cons"] // 16) & 1)
+    wait_cond(poll, timeout_ms=timeout_ms, msg=f"RCFW {name}")
+
+    ret = resp_t.from_buffer_copy(bytes(_qread(self.creq, self.creq["cons"])))
+    self.creq["cons"] += 1
+
+    # NQ_ARM also publishes the CREQ consumer index, which is what frees ring space for the next command
+    self.doorbell(self.creq_id, bnxt.DBC_DBC_TYPE_NQ_ARM, self.creq["cons"] & 15, (self.creq["cons"] // 16) & 1)
+    assert ret.status == 0, f"RCFW {name}: {ret.status}"
+
+    if BNXT_DEBUG >= 1: print(f"bnxt {self.devfmt}: rcfw {name} xid={getattr(ret, 'xid', 0):#x}")
+    return ret
+
+  def doorbell(self, xid, typ, index, epoch):
+    System.memory_barrier()
+    self.db[self.db_off // 8] = db_value(xid, typ, index, epoch)
+
+  # L2 receive path, required for RoCE ingress even though no ethernet receive buffers are posted
+  def _open_l2(self):
+    cq = _queue(self)
+    ci = self.hwrm("ring_alloc", enables=bnxt.RING_ALLOC_REQ_ENABLES_NQ_RING_ID_VALID, ring_type=bnxt.RING_ALLOC_REQ_RING_TYPE_L2_CMPL,
+      page_tbl_addr=cq["base"], page_size=12, page_tbl_depth=cq["level"], length=16, nq_ring_id=self.nq_id).ring_id
+    rx = _queue(self)
+    ri = self.hwrm("ring_alloc", enables=bnxt.RING_ALLOC_REQ_ENABLES_NQ_RING_ID_VALID |
+      bnxt.RING_ALLOC_REQ_ENABLES_RX_BUF_SIZE_VALID, ring_type=bnxt.RING_ALLOC_REQ_RING_TYPE_RX, page_tbl_addr=rx["base"],
+      page_size=12, page_tbl_depth=rx["level"], length=16, rx_buf_size=640, nq_ring_id=self.nq_id).ring_id
+    vi = self.hwrm("vnic_alloc").vnic_id
+    self.hwrm("vnic_cfg", enables=bnxt.VNIC_CFG_REQ_ENABLES_MRU | bnxt.VNIC_CFG_REQ_ENABLES_DEFAULT_RX_RING_ID |
+      bnxt.VNIC_CFG_REQ_ENABLES_DEFAULT_CMPL_RING_ID, vnic_id=vi, mru=9018,
+      default_rx_ring_id=ri, default_cmpl_ring_id=ci)
+    self.hwrm("cfa_l2_filter_alloc", flags=bnxt.CFA_L2_FILTER_ALLOC_REQ_FLAGS_PATH_RX,
+      enables=bnxt.CFA_L2_FILTER_ALLOC_REQ_ENABLES_L2_ADDR | bnxt.CFA_L2_FILTER_ALLOC_REQ_ENABLES_L2_ADDR_MASK |
+      bnxt.CFA_L2_FILTER_ALLOC_REQ_ENABLES_DST_ID, l2_addr=tuple(self.mac.to_bytes(6, 'big')), l2_addr_mask=(0xff,) * 6, dst_id=vi)
+
+  def register_mem(self, paddrs:list[int], size:int, log_page_size:int=12) -> int:
+    level, base = _pbl(self, paddrs[:ceildiv(size, 1 << log_page_size)])
+    return self.rcfw("register_mr", flags=bnxt.CMDQ_REGISTER_MR_FLAGS_ALLOC_MR,
+      log2_pg_size_lvl=level << bnxt.CMDQ_REGISTER_MR_LVL_SFT | log_page_size << bnxt.CMDQ_REGISTER_MR_LOG2_PG_SIZE_SFT,
+      access=bnxt.CMDQ_REGISTER_MR_ACCESS_LOCAL_WRITE | bnxt.CMDQ_REGISTER_MR_ACCESS_REMOTE_WRITE,
+      log2_pbl_pg_size=12, pbl=base, va=paddrs[0], mr_size=size).xid
+
+class BNXTQP:
+  def __init__(self, dev:BNXTDev):
+    self.dev, self.sq_psn, self.msn = dev, 0, 0
+
+    self.cqq = _queue(dev, ctypes.sizeof(bnxt.struct_cq_base))
+    self.cq_id = dev.rcfw("create_cq", cq_size=16, pbl=self.cqq["base"],
+                          pg_size_lvl=self.cqq["level"], cq_fco_cnq_id=dev.nq_id).xid
+
+    self.sq = _queue(dev, aux=True)
+    self.qpn = dev.rcfw("create_qp", type=bnxt.CMDQ_CREATE_QP_TYPE_RC,
+      sq_size=16, sq_fwo_sq_sge=1, scq_cid=self.cq_id, rcq_cid=self.cq_id,
+      sq_pbl=self.sq["base"], sq_pg_size_sq_lvl=self.sq["level"]).xid
+    self.qp_op(1, BNXT_INIT_MASK, access=BNXT_ACCESS, pkey=0xffff)
+
+  def qp_op(self, state, mask, network_type=0, **fields):
+    self.dev.rcfw("modify_qp", qp_cid=self.qpn, modify_mask=mask,
+      network_type_en_sqd_async_notify_new_state=state | network_type, **fields)
+
+  def connect(self, qpn:int, gid:bytes, mac:int):
+    network_type = bnxt.CMDQ_MODIFY_QP_NETWORK_TYPE_ROCEV2_IPV4
+    dgid = (ctypes.c_uint32 * 4)(*(int.from_bytes(gid[i:i + 4], 'little') for i in (0, 4, 8, 12)))
+    dmac = (ctypes.c_uint16 * 3)(*(int.from_bytes(mac.to_bytes(6, 'big')[i:i + 2], 'little') for i in (0, 2, 4)))
+
+    self.qp_op(2, BNXT_RTR_MASK, network_type=network_type, qp_type=bnxt.CMDQ_MODIFY_QP_QP_TYPE_RC, access=BNXT_ACCESS,
+      pkey=0xffff, dgid=dgid, sgid_index=self.dev.gid_id, hop_limit=64, dest_mac=dmac,
+      path_mtu_pingpong_push_enable=bnxt.CMDQ_MODIFY_QP_PATH_MTU_MTU_1024, max_dest_rd_atomic=4,
+      dest_qp_id=qpn)
+    self.qp_op(3, BNXT_RTS_MASK, network_type=network_type, qp_type=bnxt.CMDQ_MODIFY_QP_QP_TYPE_RC, access=BNXT_ACCESS,
+      max_rd_atomic=1)
+
+    if BNXT_DEBUG >= 1: print(f"bnxt: QP {self.qpn:#x} connected (remote={qpn:#x})")
+
+  def _poll(self, timeout):
+    def poll():
+      base = bnxt.struct_cq_base.from_buffer_copy(bytes(_qread(self.cqq, self.cqq["cons"])))
+      return bool(base.cqe_type_toggle & bnxt.CQ_BASE_TOGGLE) == (not bool((self.cqq["cons"] // 16) & 1))
+    wait_cond(poll, timeout_ms=timeout, msg="BNXT CQ")
+    raw = bytes(_qread(self.cqq, self.cqq["cons"]))
+    self.cqq["cons"] += 1
+    self.dev.doorbell(self.cq_id, bnxt.DBC_DBC_TYPE_CQ, self.cqq["cons"] & 15, (self.cqq["cons"] // 16) & 1)
+    return raw
+
+  def rdma_write(self, rva, rkey, lva, lkey, size, timeout_ms=20000):
+    start = self.sq["prod"] & 15
+    hdr = bytes(bnxt.struct_sq_rdma_hdr(wqe_type=bnxt.SQ_RDMA_HDR_WQE_TYPE_WRITE_WQE,
+                flags=bnxt.SQ_SEND_FLAGS_SIGNAL_COMP, wqe_size=3, length=size, remote_va=rva, remote_key=rkey))
+    for i, data in enumerate((hdr[:16], hdr[16:32], bytes(bnxt.struct_sq_sge(va_or_pa=lva, l_key=lkey, size=size)))):
+      _qwrite(self.sq, start + i, data)
+    nxt = (self.sq_psn + max(1, ceildiv(size, 1024))) & 0xffffff
+    value = start << bnxt.SQ_MSN_SEARCH_START_IDX_SFT | nxt << bnxt.SQ_MSN_SEARCH_NEXT_PSN_SFT | self.sq_psn
+    _qwrite(self.sq, self.msn, struct.pack("<Q", value), aux=True)
+
+    self.msn, self.sq_psn, self.sq["prod"] = (self.msn + 1) % 128, nxt, self.sq["prod"] + 3
+    self.dev.doorbell(self.qpn, bnxt.DBC_DBC_TYPE_SQ, self.sq["prod"] & 15, (self.sq["prod"] // 16) & 1)
+    cqe = bnxt.struct_cq_req.from_buffer_copy(self._poll(timeout_ms))
+    assert cqe.status == 0
@@ -0,0 +1,118 @@
+#!/usr/bin/env python3
+"""Send and validate one RDMA WRITE between two Broadcom BNXT hosts.
+
+This follows ``extra/mlx_driver/connect.py``: sync the driver, start the remote
+endpoint over SSH, exchange QP/GID/MAC/MR metadata, move both RC QPs to RTS,
+write bytes into the remote MR, and verify the bytes on the remote host.
+
+Both PCI functions must be unbound from bnxt_en/bnxt_re first.
+"""
+import json
+import os
+import subprocess
+import sys
+from typing import Any, IO
+
+TINYGRAD = os.path.normpath(os.path.join(os.path.dirname(os.path.abspath(__file__)), "../.."))
+sys.path.insert(0, TINYGRAD)
+
+from extra.bnxt_driver.bnxtdev import BNXTDev, BNXTQP
+from tinygrad.runtime.support.system import PCIDevice
+
+REMOTE_HOST = os.getenv("REMOTE_HOST", "192.168.52.213")
+REMOTE_USER = os.getenv("REMOTE_USER", "nimlgen")
+LOCAL_PCI = os.getenv("BNXT_PCI", "0000:41:00.0")
+REMOTE_PCI = os.getenv("REMOTE_PCI", "0000:41:00.0")
+LOCAL_IP = os.getenv("LOCAL_IP", "10.0.200.5")
+REMOTE_IP = os.getenv("REMOTE_IP", "10.0.200.6")
+MESSAGE = os.getenv("RDMA_MESSAGE", "Test message, rdma works!").encode()
+REMOTE = f"{REMOTE_USER}@{REMOTE_HOST}"
+SSH = ["ssh", "-o", "BatchMode=yes", "-o", "ConnectTimeout=10", "-o", "StrictHostKeyChecking=accept-new", REMOTE]
+SYNC_FILES = ("tinygrad/runtime/autogen/bnxt.py", "tinygrad/runtime/support/system.py",
+              "extra/bnxt_driver/bnxtdev.py", "extra/bnxt_driver/connect.py")
+
+def read_json(stream:IO[str], what:str) -> dict[str, Any]:
+  for line in iter(stream.readline, ""):
+    print(f"  [remote] {line}", end="")
+    try: value = json.loads(line)
+    except json.JSONDecodeError: continue
+    if isinstance(value, dict): return value
+  raise RuntimeError(f"remote exited before publishing {what}")
+
+def wait_line(stream:IO[str], text:str) -> str:
+  for line in iter(stream.readline, ""):
+    print(f"  [remote] {line}", end="")
+    if text in line: return line
+  raise RuntimeError(f"remote exited before reporting {text!r}")
+
+def send_line(stream:IO[str], value:str|dict[str, Any]):
+  stream.write((json.dumps(value) if isinstance(value, dict) else value) + "\n")
+  stream.flush()
+
+def qp_info(dev:BNXTDev, qp:BNXTQP) -> dict[str, Any]:
+  return {"qpn":qp.qpn, "mac":dev.mac.to_bytes(6, "big").hex(), "gid":dev.local_gid.hex()}
+
+def server():
+  dev = BNXTDev(PCIDevice("bnxt", os.getenv("BNXT_PCI", "0000:41:00.0")), ip=os.getenv("BNXT_IP", REMOTE_IP))
+  qp = BNXTQP(dev)
+  print(json.dumps(qp_info(dev, qp)), flush=True)
+
+  peer = json.loads(sys.stdin.readline())
+  qp.connect(peer["qpn"], bytes.fromhex(peer["gid"]), int(peer["mac"], 16))
+  print("connected", flush=True)
+
+  target, target_paddrs = dev.pci_dev.alloc_sysmem(0x1000)
+  target[:0x1000] = bytes(0x1000)
+  rkey = dev.register_mem(target_paddrs, 0x1000)
+  print(json.dumps({"target_addr":target_paddrs[0], "rkey":rkey}), flush=True)
+
+  assert sys.stdin.readline().strip() == "done"
+  received = bytes(target).rstrip(b"\0")
+  print(f"AS TEXT: {received.decode(errors='replace')!r}", flush=True)
+  print(json.dumps({"data":received.hex()}), flush=True)
+
+def sync_remote():
+  if os.getenv("SYNC", "1") == "0": return
+  print("syncing BNXT driver to remote")
+  subprocess.run(["rsync", "-azR", *SYNC_FILES, f"{REMOTE}:~/tinygrad/"], cwd=TINYGRAD, check=True)
+
+def start_remote() -> subprocess.Popen[str]:
+  print("booting remote")
+  command = (f"cd ~/tinygrad && sudo env PYTHONPATH=. PYTHONUNBUFFERED=1 BNXT_DEBUG={os.getenv('BNXT_DEBUG', '0')} "
+             f"BNXT_PCI={REMOTE_PCI} BNXT_IP={REMOTE_IP} python3 extra/bnxt_driver/connect.py --server")
+  return subprocess.Popen(SSH + [command], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=sys.stderr, text=True)
+
+def client():
+  assert 0 < len(MESSAGE) <= 0x1000
+  sync_remote()
+  remote = start_remote()
+  assert remote.stdin is not None and remote.stdout is not None
+  remote_info = read_json(remote.stdout, "QP information")
+  print("booting local")
+  dev = BNXTDev(PCIDevice("bnxt", LOCAL_PCI), ip=LOCAL_IP)
+  qp = BNXTQP(dev)
+
+  send_line(remote.stdin, qp_info(dev, qp))
+  wait_line(remote.stdout, "connected")
+  qp.connect(remote_info["qpn"], bytes.fromhex(remote_info["gid"]), int(remote_info["mac"], 16))
+  print("both QPs in RTS")
+
+  remote_target = read_json(remote.stdout, "MR information")
+  source, source_paddrs = dev.pci_dev.alloc_sysmem(0x1000)
+  source[:len(MESSAGE)] = MESSAGE
+  lkey = dev.register_mem(source_paddrs, 0x1000)
+  print(f"RDMA WRITE {len(MESSAGE)}B to remote phys 0x{remote_target['target_addr']:x}")
+  qp.rdma_write(remote_target["target_addr"], remote_target["rkey"], source_paddrs[0], lkey, len(MESSAGE))
+
+  send_line(remote.stdin, "done")
+  wait_line(remote.stdout, "AS TEXT")
+  result = read_json(remote.stdout, "RDMA result")
+  assert bytes.fromhex(result["data"]) == MESSAGE
+  print("RDMA WRITE data verified")
+
+  remote.stdin.close()
+  assert remote.wait() == 0
+  print("RDMA WRITE test complete")
+
+if __name__ == "__main__":
+  server() if "--server" in sys.argv else client()
@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+"""Local BNXT RoCEv2 RDMA WRITE loopback using the firmware's PHY loopback mode.
+
+The kernel bnxt_en/bnxt_re modules must be unloaded first.
+
+  sudo PYTHONPATH=. BNXT_PCI=0000:41:00.0 BNXT_IP=10.0.200.5 python3 extra/bnxt_driver/loopback.py
+"""
+import os
+import sys
+import time
+
+sys.path.insert(0, os.path.join(os.path.dirname(os.path.abspath(__file__)), "../.."))
+
+from extra.bnxt_driver.bnxtdev import BNXTDev, BNXTQP
+from tinygrad.runtime.autogen import bnxt
+from tinygrad.runtime.support.system import PCIDevice
+
+BUF_SIZE = 0x1000
+BNXT_PCI = os.getenv("BNXT_PCI", "0000:41:00.0")
+BNXT_IP = os.getenv("BNXT_IP", "10.0.200.5")
+
+if __name__ == "__main__":
+  print(f"[init] BNXT at {BNXT_PCI}")
+  dev = BNXTDev(PCIDevice("bnxt", BNXT_PCI), ip=BNXT_IP)
+  tx_qp, rx_qp = BNXTQP(dev), BNXTQP(dev)
+  print(f"[init] loopback-connect TX QP 0x{tx_qp.qpn:x} <-> RX QP 0x{rx_qp.qpn:x}")
+  tx_qp.connect(rx_qp.qpn, dev.local_gid, dev.mac)
+  rx_qp.connect(tx_qp.qpn, dev.local_gid, dev.mac)
+
+  src, src_paddrs = dev.pci_dev.alloc_sysmem(BUF_SIZE)
+  dst, dst_paddrs = dev.pci_dev.alloc_sysmem(BUF_SIZE)
+  message = b"Hello from BNXT RoCE PHY loopback!"
+  src[:BUF_SIZE], dst[:BUF_SIZE] = bytes(BUF_SIZE), bytes(BUF_SIZE)
+  src[:len(message)] = message
+  lkey = dev.register_mem(src_paddrs, BUF_SIZE)
+  rkey = dev.register_mem(dst_paddrs, BUF_SIZE)
+
+  print("[loopback] enabling local PHY loopback")
+  dev.hwrm("port_phy_cfg", port_id=dev.port_id, enables=bnxt.PORT_PHY_CFG_REQ_ENABLES_LPBK, lpbk=bnxt.PORT_PHY_CFG_REQ_LPBK_LOCAL)
+  time.sleep(1)
+  tx_qp.rdma_write(dst_paddrs[0], rkey, src_paddrs[0], lkey, len(message))
+  got = bytes(dst[:len(message)])
+  print(f"[result] {got!r}")
+  assert got == message
+  print("BNXT RoCE PHY loopback RDMA WRITE passed")
+  dev.hwrm("port_phy_cfg", port_id=dev.port_id, enables=bnxt.PORT_PHY_CFG_REQ_ENABLES_LPBK, lpbk=bnxt.PORT_PHY_CFG_REQ_LPBK_NONE)
@@ -241,8 +241,7 @@ export default {model_name};
 def export_model(model, target:str, *inputs, model_name: Optional[str] = "model", stream_weights=False):
  assert Device.DEFAULT in EXPORT_SUPPORTED_DEVICE, f"only {', '.join(EXPORT_SUPPORTED_DEVICE)} are supported"

-  # NOTE: NUM_CPU_THREADS=1, since export does not support threading
-  with Context(JIT=2, NUM_CPU_THREADS=1): linear, output_bufs = jit_model(model, *inputs)
+  with Context(JIT=2): linear, output_bufs = jit_model(model, *inputs)
  functions, statements, bufs, bufs_to_save = compile_net(linear, output_bufs)
  state = get_state_dict(model)
  weight_names = {(id(b), b.offset, b.size, b.dtype): name for name, x in state.items() if (b:=x.uop.base.realized) is not None}
@@ -462,7 +462,7 @@ def test_matmul():
    lds = UOp.placeholder((lds_size,), dtypes.uint8, 0, AddrSpace.LOCAL)
    sink = UOp.sink(A.base, B.base, C.base, lds, *gidxs, *lidxs, arg=KernelInfo(name=colored("kernel", "cyan"),
                                                                                  estimates=Estimates(ops=N*N*N*2, mem=N*N*4*3)))
-    return UOp(Ops.PROGRAM, src=(sink, UOp(Ops.LINEAR, src=tuple([UOp(Ops.INS, arg=x) for x in insts]))))
+    return UOp(Ops.PROGRAM, src=(sink, UOp(Ops.LINEAR, src=tuple([UOp(Ops.INS, arg=(x, dtypes.void)) for x in insts]))))
  c = Tensor.custom_kernel(a, b, c, fxn=asm_kernel)[2]
  linear = c.schedule_linear()

@@ -125,7 +125,7 @@ def custom_mxfp4_gemm(C:UOp, A:UOp, B:UOp, scale_a:UOp, scale_b:UOp, *extra:UOp,
                  arg=KernelInfo(f"mxfp4_gemm_{M}_{N}_{K}",
                                 estimates=Estimates(ops=2*M*N*K, mem=(M*half_k+N*half_k)*A.dtype.itemsize+M*N*C.dtype.itemsize)))
  insts = build_kernel(M, N, K, tile_m, tile_n)
-  return UOp(Ops.PROGRAM, src=(sink, UOp(Ops.LINEAR, src=tuple(UOp(Ops.INS, arg=x) for x in insts))))
+  return UOp(Ops.PROGRAM, src=(sink, UOp(Ops.LINEAR, src=tuple(UOp(Ops.INS, arg=(x, dtypes.void)) for x in insts))))

 def _mxfp4_gemm_quantized(a_q:Tensor, b_q:Tensor, scale_a:Tensor, scale_b:Tensor) -> Tensor:
  M, half_k = a_q.shape
@@ -215,7 +215,7 @@ def custom_uop_gemm(C:UOp, A:UOp, B:UOp) -> UOp:
  k = UOp.range(K, 0, AxisType.REDUCE)
  mul = (A.flatten().index((m*UOp.const(K)+k))*
         B.flatten().index((k*UOp.const(N)+n))).cast(dtypes.float32)
-  red = mul.reduce(k, arg=Ops.ADD, dtype=dtypes.float32).cast(C.dtype)
+  red = mul.reduce(k, arg=Ops.ADD).cast(C.dtype)
  store = C.flatten().index((m*UOp.const(N)+n)).store(red).end(m, n)
  return store.sink(arg=KernelInfo(name=f'uop_gemm_{M}_{N}_{K}'))

@@ -113,7 +113,6 @@ if __name__ == "__main__":
      }
    elif GEMM_VARIATION == "hcopt" and M == N == K == 4096 and DTYPE_IN == dtypes.half and DTYPE_OUT == dtypes.half and DTYPE_ACC == dtypes.float:
      print("Using CUDA and generated hcopt")
-      # [Opt(op=OptOps.TC, axis=0, amt=0), Opt(op=OptOps.UPCAST, axis=0, amt=4), Opt(op=OptOps.UPCAST, axis=1, amt=4), Opt(op=OptOps.LOCAL, axis=1, amt=4)]
      prog = CUDAProgram(device, "wmma_example", compiler.compile(open(os.path.join(script_dir, 'max_kernels/nv.fp16_fp32_fp16.hcopt.cu')).read()))
      args = (c, a, b)
      kwargs = {
@@ -1,10 +1,32 @@
 import functools, pathlib
 from tinygrad import Tensor, dtypes
-from tinygrad.uop.ops import UOp, Ops, KernelInfo
+from tinygrad.uop.ops import UOp, Ops, KernelInfo, AxisType
+from tinygrad.helpers import getenv
 from tinygrad.renderer import Estimates
 from tinygrad.runtime.support.compiler_amd import HIPCCCompiler
 from extra.gemm.cdna_asm_gemm import quantize_mxfp8, _mx_block_scale, _mx_block_scale_3d

+ZERO_OPTIM = getenv("ZERO_OPTIM", 0)
+
+def reduce_scatter_devaxis(out:Tensor, shard_axis:int=0) -> Tensor:
+  # out: sharded on the device axis, shape (ndev, *rest); return the device-axis sum left sharded on shard_axis.
+  u = out.uop
+  devs, rest = u.device, u.shape[1:]
+  assert rest[shard_axis] % len(devs) == 0, f"reduce_scatter needs even shards: {rest[shard_axis]} % {len(devs)}"
+  # reach the raw per-device buffer below the UNSHARD, keeping the AFTERs so reads stay ordered after the kernel writes
+  node, barriers = u, []
+  while node.op is not Ops.UNSHARD:
+    if node.op is Ops.AFTER: barriers += node.src[1:]
+    node = node.src[0]
+  mbuf = node.src[0].after(*barriers) if barriers else node.src[0]
+  sz = rest[shard_axis] // len(devs)
+  shards = []
+  for i in range(len(devs)):
+    bounds = tuple((0,s) if a != shard_axis else (i*sz,(i+1)*sz) for a,s in enumerate(rest))
+    contribs = [mbuf.mselect(j).reshape(rest).shrink(bounds).copy_to_device(devs[i]) for j in range(len(devs))]
+    shards.append(functools.reduce(lambda a,b: a.alu(Ops.ADD, b), contribs))
+  return Tensor(UOp.mstack(*shards).unshard(shard_axis, UOp.range(len(devs), -1, AxisType.DEVICE)), device=devs)
+
@functools.cache
 def custom_hk_grouped_mxfp8_gemm(C:UOp, A:UOp, B:UOp, scale_A:UOp, scale_B:UOp, *extra:UOp, dname:str, n_experts:int) -> UOp:
  M, K = A.shape
@@ -58,7 +80,8 @@ def grouped_mx_wgrad(g:Tensor, xg:Tensor, expert_off:Tensor, n_experts:int) -> T
  out = Tensor(inv.uop.unshard(0), device=g.device) if is_multi else inv
  out = Tensor.custom_kernel(out, gT, xT, g_si, x_si, expert_off,
                             fxn=functools.partial(custom_hk_grouped_mxfp8_wgrad, dname=dname, n_experts=n_experts))[0]
-  out = out.sum(0) if is_multi else out.squeeze(0)
+  if is_multi and ZERO_OPTIM: out = reduce_scatter_devaxis(out, 0)
+  else: out = out.sum(0) if is_multi else out.squeeze(0)
  return out.reshape(n_experts, N, K)

 def mx_pack_3d(e8:Tensor) -> Tensor:
@@ -1,8 +1,53 @@
+import functools, math, pathlib
 from tinygrad import Tensor, dtypes
+from tinygrad.helpers import getenv
 from tinygrad.uop.ops import UOp, Ops, KernelInfo, AxisType
+from tinygrad.renderer import Estimates
+from tinygrad.runtime.support.compiler_amd import HIPCCCompiler

 BLOCK_ROW = 256

+@functools.cache
+def _router_mfma_fwd(out:UOp, x:UOp, weight:UOp, bias:UOp, *, dname:str) -> UOp:
+  *lead, K = x.shape
+  M = math.prod(lead)
+  E = weight.shape[0]
+  threads = UOp.special(256, "lidx0")
+  workgroups = UOp.special((M + 63) // 64, "gidx0")
+  sink = UOp.sink(out.base, x.base, weight.base, bias.base, threads, workgroups,
+                  arg=KernelInfo(f"moe_router_mfma_{M}_{K}_{E}", estimates=Estimates(ops=2*M*E*K, mem=(M*K+E*K+E)*2+M*E*4)))
+  amd = pathlib.Path(__file__).parent.parent/"thunder"/"amd"
+  src = (amd/"moe_router_mfma.cpp").read_text()
+  lib = HIPCCCompiler("gfx950", [f"-I{(amd/'include').as_posix()}", "-std=c++20", "-DKITTENS_CDNA4", "-DHIP_ENABLE_WARP_SYNC_BUILTINS",
+                                 f"-DROUTER_M={M}", f"-DROUTER_K={K}", f"-DROUTER_E={E}"]).compile_cached(src)
+  return UOp(Ops.PROGRAM, src=(sink, UOp(Ops.LINEAR, src=(*sink.src, sink)), UOp(Ops.SOURCE, arg=src), UOp(Ops.BINARY, arg=lib)))
+
+def _router_mfma_bwd(gradient:UOp, kernel:UOp) -> tuple:
+  _, x_u, weight_u, bias_u = kernel.src[1:5]
+  x, weight, bias = (Tensor(u, device=u.device) for u in (x_u, weight_u, bias_u))
+  reference = x.float() @ weight.float().T + bias.float()
+  grad_x, grad_weight, grad_bias = reference.gradient(x, weight, bias, gradient=Tensor(gradient, device=x_u.device))
+  return None, grad_x.uop, grad_weight.uop, grad_bias.uop
+
+def router_mfma(x:Tensor, weight:Tensor, bias:Tensor) -> Tensor:
+  assert x.ndim >= 2 and weight.ndim == 2 and bias.ndim == 1
+  K = x.shape[-1]
+  E = weight.shape[0]
+  assert weight.shape == (E, K) and bias.shape == (E,)
+  assert x.dtype == weight.dtype == bias.dtype == dtypes.bfloat16
+  assert E == 32 and K % 64 == 0
+  if isinstance(x.device, tuple):
+    assert x.uop.axis == 0, f"router MFMA requires axis-0 sharding, got axis={x.uop.axis}"
+    local_shape = x.uop.shard_shape
+    assert local_shape[-1] == K and math.prod(local_shape[:-1]) % 64 == 0, f"unsupported local router shape {local_shape}"
+  else:
+    assert math.prod(x.shape[:-1]) % 64 == 0
+  x, weight, bias = x.contiguous(), weight.contiguous(), bias.contiguous()
+  out = _sharded_invalids((*x.shape[:-1], E), dtypes.float32, x.device)
+  out, *_ = Tensor.custom_kernel(out, x, weight, bias,
+    fxn=functools.partial(_router_mfma_fwd, dname=str(x.device)), grad_fxn=_router_mfma_bwd)
+  return out
+
 def _sharded_invalids(shape:tuple[int, ...], dtype, device) -> Tensor:
  if isinstance(device, tuple):
    per = Tensor.invalids(shape[0]//len(device), *shape[1:], dtype=dtype, device=device)
@@ -53,7 +98,7 @@ def _ggather_bwd(gradient:UOp, kernel:UOp) -> tuple:
    g, m, j, jo, ji = _kv_ranges(Gk, M, Dk, _blk_for(Dk))
    row = idx.index(g, m).cast(dtypes.weakint)
    val = gout.index(g, m, j).load().cast(dtypes.float32)
-    atomic = UOp(Ops.CUSTOM, dtypes.void, (gtab.index(g, row, j), val), arg=atomic_str)
+    atomic = UOp(Ops.CUSTOM, src=(gtab.index(g, row, j), val), arg=(atomic_str, dtypes.void))
    return atomic.end(g, m, jo, ji).sink(arg=KernelInfo(name=f"ggather_bwd_{M}_{Dk}", opts_to_apply=()))
  grad_table = Tensor.custom_kernel(gt, go, Tensor(idx_u, device=dev), fxn=_bwd_kernel)[0]
  return (None, grad_table.cast(table_u.dtype).uop, None)
@@ -223,7 +223,7 @@ def test_matmul():
    lds = UOp.placeholder((lds_size,), dtypes.uint8, 0, AddrSpace.LOCAL)
    sink = UOp.sink(A.base, B.base, C.base, lds, *gidxs, *lidxs,
                    arg=KernelInfo(name=colored("kernel","cyan"), estimates=Estimates(ops=N*N*N*2, mem=N*N*2*3)))
-    return UOp(Ops.PROGRAM, src=(sink, UOp(Ops.LINEAR, src=tuple([UOp(Ops.INS, arg=x) for x in insts]))))
+    return UOp(Ops.PROGRAM, src=(sink, UOp(Ops.LINEAR, src=tuple([UOp(Ops.INS, arg=(x, dtypes.void)) for x in insts]))))

  c = Tensor.custom_kernel(a, b, c, fxn=asm_kernel)[2]
  linear = c.schedule_linear()
@@ -2,7 +2,7 @@ import numpy as np
 from tinygrad import dtypes, Tensor
 from tinygrad.helpers import getenv, get_single_element
 from tinygrad.dtype import _to_np_dtype
-from tinygrad.engine.realize import compile_linear
+from tinygrad.engine.realize import lower_and_compile
 from tinygrad.codegen.opt import OptOps

 dtype_in = (dtypes.half if getenv("HALF") else dtypes.bfloat16 if getenv("BFLOAT16") else
@@ -39,7 +39,7 @@ if __name__ == "__main__":
    c = a.matmul(b, dtype=acc_dtype).realize()

  if getenv("SHOULD_USE_TC"):
-    linear = compile_linear(a.matmul(b, dtype=acc_dtype).schedule_linear())
+    linear = lower_and_compile(a.matmul(b, dtype=acc_dtype).schedule_linear())
    call = get_single_element(list(linear.src))
    applied_opts = call.src[0].src[0].arg.applied_opts
    assert any(opt.op is OptOps.TC for opt in applied_opts), f"TC not triggered, {applied_opts}"
@@ -1,6 +1,7 @@
 from tinygrad import Tensor, dtypes, Context
 from tinygrad.helpers import getenv
 from tinygrad.codegen.opt import Opt, OptOps
+from tinygrad.uop.ops import AxisType
 from tinygrad.engine.realize import run_linear
 from dataclasses import replace

@@ -13,17 +14,17 @@ if __name__ == "__main__":
  C = A.matmul(B)
  if getenv("GEMV"):
    opts = [
-      Opt(op=OptOps.UNROLL, axis=0, amt=8),
-      Opt(op=OptOps.GROUP, axis=0, amt=32),
+      Opt(op=OptOps.SPLIT, axis=1, arg=(8, AxisType.UNROLL)),
+      Opt(op=OptOps.SPLIT, axis=1, arg=(32, AxisType.GROUP_REDUCE)),
    ]
  else:
    opts = [
      Opt(op=OptOps.TC, axis=0, amt=0),
-      Opt(op=OptOps.UPCAST, axis=0, amt=4),
-      Opt(op=OptOps.UPCAST, axis=1, amt=8),
-      Opt(op=OptOps.LOCAL, axis=0, amt=2),
-      Opt(op=OptOps.LOCAL, axis=1, amt=2),
-      Opt(op=OptOps.LOCAL, axis=0, amt=2),
+      Opt(op=OptOps.SPLIT, axis=0, arg=(4, AxisType.UPCAST)),
+      Opt(op=OptOps.SPLIT, axis=1, arg=(8, AxisType.UPCAST)),
+      Opt(op=OptOps.SPLIT, axis=0, arg=(2, AxisType.LOCAL)),
+      Opt(op=OptOps.SPLIT, axis=1, arg=(2, AxisType.LOCAL)),
+      Opt(op=OptOps.SPLIT, axis=0, arg=(2, AxisType.LOCAL)),
    ]
  linear = C.schedule_linear()
  call = linear.src[-1]
@@ -0,0 +1,94 @@
+from __future__ import annotations
+import functools, math, pathlib
+from tinygrad import Tensor, dtypes
+from tinygrad.uop.ops import UOp, Ops, KernelInfo
+from tinygrad.renderer import Estimates
+from extra.gemm.cdna_asm_gemm import FP8_DTYPE
+from extra.llama_kernels import NUM_WG, THREADS_PER_WG, alloc_like, alloc_local, compile_hip, dname_of
+
+def rmsnorm_mul_fwd(x_in:Tensor, weight:Tensor, eps:float) -> tuple[Tensor, Tensor]:
+  x = x_in.float()
+  rrms = (x.square().mean(-1, keepdim=True) + eps).rsqrt()
+  return ((x * rrms) * weight.float()).cast(x_in.dtype), rrms
+
+@functools.cache
+def _rmsnorm_mul_fwd_fxn(x_in_p, w_p, eps, device):
+  return rmsnorm_mul_fwd(Tensor(x_in_p, device=device), Tensor(w_p, device=device), eps)
+
+def _rmsnorm_mul_bwd(grad:UOp, call:UOp) -> tuple:
+  x = Tensor(call.src[1]).float(); weight = Tensor(call.src[2]).float()
+  rrms = Tensor(call.unbound_outputs[1])
+  x_normed = x * rrms                                  # recompute unweighted normed (x is call.src[1])
+  d_y = Tensor(grad).float()
+  dxn = d_y * weight                                   # d/d(x_normed)
+  d_x = rrms * (dxn - x_normed * (dxn * x_normed).mean(-1, keepdim=True))
+  dw = d_y * x_normed
+  d_weight = dw.sum(axis=tuple(range(dw.ndim - 1)))    # reduce batch/seq -> [dim]
+  return (d_x.cast(call.src[1].dtype).uop, d_weight.cast(call.src[2].dtype).uop)
+
+def rmsnorm_mul(x_in:Tensor, weight:Tensor, eps:float) -> tuple[Tensor, Tensor]:
+  fxn = _rmsnorm_mul_fwd_fxn(x_in.as_param(0).uop, weight.as_param(1).uop, eps, x_in.device)
+  outs = UOp.call_with_outputs((fxn[0].uop, fxn[1].uop), x_in.uop, weight.uop, grad_fxn=_rmsnorm_mul_bwd)
+  return Tensor(outs[0]), Tensor(outs[1])
+
+@functools.cache
+def _custom_rmsnorm_mul_quantize_mxfp8_fwd(q:UOp, e8:UOp, rrms:UOp, x:UOp, weight:UOp, *, dname:str, eps:float) -> UOp:
+  *lead, hidden = x.shape
+  rows, padded = math.prod(lead), q.shape[-1]
+  num_wg = min(NUM_WG, rows)
+  threads, workgroups = UOp.special(THREADS_PER_WG, "lidx0"), UOp.special(num_wg, "gidx0")
+  sink = UOp.sink(q.base, e8.base, rrms.base, x.base, weight.base, threads, workgroups,
+                  arg=KernelInfo(f"rmsnorm_mul_quantize_mxfp8_{rows}_{hidden}_{padded}",
+                                 estimates=Estimates(ops=8*rows*hidden, mem=rows*(hidden*2+padded+padded//32+4)+hidden*2)))
+  src = (pathlib.Path(__file__).parent/"rmsnorm_mul_quantize_mxfp8.cpp").read_text()
+  defines = [f"-DN_ELEMS={rows*hidden}", f"-DHIDDEN={hidden}", f"-DPADDED={padded}",
+             f"-DNUM_WG={num_wg}", f"-DTHREADS_PER_WG={THREADS_PER_WG}", f"-DEPS_LITERAL={eps}f"]
+  return UOp(Ops.PROGRAM, src=(sink, UOp(Ops.LINEAR, src=(*sink.src, sink)), UOp(Ops.SOURCE, arg=src),
+                               UOp(Ops.BINARY, arg=compile_hip(src, defines))))
+
+@functools.cache
+def _custom_rmsnorm_mul_quantize_mxfp8_bwd(grad_x:UOp, grad_weight_partial:UOp, grad_q:UOp, x:UOp, weight:UOp, e8:UOp, rrms:UOp,
+                *, dname:str) -> UOp:
+  *lead, hidden = x.shape
+  rows, padded = math.prod(lead), grad_q.shape[-1]
+  num_wg = min(NUM_WG, rows)
+  threads, workgroups = UOp.special(THREADS_PER_WG, "lidx0"), UOp.special(num_wg, "gidx0")
+  sink = UOp.sink(grad_x.base, grad_weight_partial.base, grad_q.base, x.base, weight.base, e8.base, rrms.base,
+                  threads, workgroups,
+                  arg=KernelInfo(f"rmsnorm_mul_quantize_mxfp8_bwd_{rows}_{hidden}_{padded}",
+                                 estimates=Estimates(ops=10*rows*hidden, mem=rows*(hidden*6+padded*2+padded//32+4)+num_wg*hidden*4)))
+  src = (pathlib.Path(__file__).parent/"rmsnorm_mul_quantize_mxfp8_bwd.cpp").read_text()
+  defines = [f"-DN_ELEMS={rows*hidden}", f"-DHIDDEN={hidden}", f"-DPADDED={padded}", f"-DNUM_WG={num_wg}", f"-DTHREADS_PER_WG={THREADS_PER_WG}"]
+  return UOp(Ops.PROGRAM, src=(sink, UOp(Ops.LINEAR, src=(*sink.src, sink)), UOp(Ops.SOURCE, arg=src),
+                               UOp(Ops.BINARY, arg=compile_hip(src, defines))))
+
+def _rmsnorm_mul_quantize_mxfp8_backward(gradient:UOp, kernel:UOp) -> tuple:
+  _, e8_u, rrms_u, x_u, weight_u = kernel.src[1:]
+  device = x_u.device
+  axis = x_u.axis if isinstance(device, tuple) else None
+  *lead, hidden = x_u.shape
+  num_wg = min(NUM_WG, math.prod(lead))
+  grad_x = alloc_like(x_u.shape, x_u.dtype, device, axis)
+  grad_weight_partial = alloc_local((num_wg, hidden), dtypes.float32, device, axis)
+  grad_q = Tensor(gradient, device=device).cast(dtypes.bfloat16).contiguous()
+  grad_x, grad_weight_partial, *_ = Tensor.custom_kernel(
+    grad_x, grad_weight_partial, grad_q, Tensor(x_u, device=device), Tensor(weight_u, device=device),
+    Tensor(e8_u.after(kernel), device=device), Tensor(rrms_u.after(kernel), device=device),
+    fxn=functools.partial(_custom_rmsnorm_mul_quantize_mxfp8_bwd, dname=dname_of(device)))
+  grad_weight = grad_weight_partial.sum(0).cast(weight_u.dtype)
+  return None, None, None, grad_x.uop, grad_weight.uop
+
+def rmsnorm_mul_quantize_mxfp8(x:Tensor, weight:Tensor, eps:float, padded:int|None=None) -> tuple[Tensor, Tensor, Tensor]:
+  """RMSNorm(x)*weight directly to rowwise MXFP8. Returns (q, e8, rrms), without a BF16 normalized round-trip."""
+  assert x.dtype == weight.dtype == dtypes.bfloat16 and x.shape[-1] == weight.shape[0], f"{x.shape=} {weight.shape=}"
+  hidden = x.shape[-1]
+  padded = math.ceil(hidden / 256) * 256 if padded is None else padded
+  assert padded >= hidden and padded % 256 == 0 and hidden % 32 == 0
+  axis = x.uop.axis if isinstance(x.device, tuple) else None
+  q = alloc_like((*x.shape[:-1], padded), FP8_DTYPE, x.device, axis)
+  e8 = alloc_like((*x.shape[:-1], padded // 32), dtypes.uint8, x.device, axis)
+  rrms = alloc_like((*x.shape[:-1], 1), dtypes.float32, x.device, axis)
+  q, e8, rrms, *_ = Tensor.custom_kernel(q, e8, rrms, x, weight,
+                                         fxn=functools.partial(_custom_rmsnorm_mul_quantize_mxfp8_fwd, dname=dname_of(x.device), eps=eps),
+                                         grad_fxn=_rmsnorm_mul_quantize_mxfp8_backward)
+  return q, e8, rrms
@@ -0,0 +1,95 @@
+#include <hip/hip_runtime.h>
+#include <hip/hip_bf16.h>
+#include <hip/hip_fp8.h>
+
+#ifndef N_ELEMS
+#define N_ELEMS 47185920
+#endif
+#ifndef HIDDEN
+#define HIDDEN 2880
+#endif
+#ifndef PADDED
+#define PADDED 3072
+#endif
+#ifndef NUM_WG
+#define NUM_WG 1024
+#endif
+#ifndef THREADS_PER_WG
+#define THREADS_PER_WG 256
+#endif
+#ifndef EPS_LITERAL
+#define EPS_LITERAL 1e-5f
+#endif
+
+constexpr int ROWS = N_ELEMS / HIDDEN;
+constexpr int BLOCK = 32;
+constexpr int SCALE_BLOCKS = PADDED / BLOCK;
+constexpr float FP8_MAX = 448.0f;
+
+static_assert(N_ELEMS % HIDDEN == 0, "N_ELEMS must be divisible by HIDDEN");
+static_assert(HIDDEN % BLOCK == 0 && PADDED % BLOCK == 0 && PADDED >= HIDDEN,
+              "HIDDEN and PADDED must be block aligned");
+static_assert(SCALE_BLOCKS <= THREADS_PER_WG, "one thread handles each MXFP8 block");
+
+extern "C" __global__ __launch_bounds__(THREADS_PER_WG) void rmsnorm_mul_quantize_mxfp8(
+    __hip_fp8_storage_t *__restrict__ q_out,
+    uint8_t *__restrict__ e8_out,
+    float *__restrict__ rrms_out,
+    const __hip_bfloat16 *__restrict__ x,
+    const __hip_bfloat16 *__restrict__ weight) {
+  __shared__ float reduce[THREADS_PER_WG];
+  __shared__ __hip_bfloat16 x_row[HIDDEN];
+
+  const int tid = threadIdx.x;
+  for (int row = blockIdx.x; row < ROWS; row += NUM_WG) {
+    const long long xbase = (long long)row * HIDDEN;
+    float sum_sq = 0.0f;
+    for (int col = tid; col < HIDDEN; col += THREADS_PER_WG) {
+      __hip_bfloat16 xb = x[xbase + col];
+      x_row[col] = xb;
+      float xf = (float)xb;
+      sum_sq = fmaf(xf, xf, sum_sq);
+    }
+
+    reduce[tid] = sum_sq;
+    __syncthreads();
+    for (int s = THREADS_PER_WG / 2; s > 0; s >>= 1) {
+      if (tid < s) reduce[tid] += reduce[tid + s];
+      __syncthreads();
+    }
+    const float rrms = rsqrtf(reduce[0] * (1.0f / (float)HIDDEN) + EPS_LITERAL);
+    if (tid == 0) rrms_out[row] = rrms;
+
+    if (tid < SCALE_BLOCKS) {
+      const int col_base = tid * BLOCK;
+      float vals[BLOCK];
+      float amax = 0.0f;
+      #pragma unroll
+      for (int i = 0; i < BLOCK; i++) {
+        const int col = col_base + i;
+        float v = 0.0f;
+        if (col < HIDDEN) {
+          float xn = (float)x_row[col] * rrms;
+          __hip_bfloat16 yb = (__hip_bfloat16)(xn * (float)weight[col]);
+          v = (float)yb;
+        }
+        vals[i] = v;
+        amax = fmaxf(amax, fabsf(v));
+      }
+      int e8 = (int)floorf(log2f(fmaxf(amax, 1e-38f))) + 127;
+      e8 = max(0, min(254, e8));
+      const float qscale = exp2f((float)(127 - e8));
+      __hip_fp8_storage_t packed[BLOCK];
+      #pragma unroll
+      for (int i = 0; i < BLOCK; i++) {
+        float v = fmaxf(-FP8_MAX, fminf(FP8_MAX, vals[i] * qscale));
+        packed[i] = __hip_cvt_float_to_fp8(v, __HIP_SATFINITE, __HIP_E4M3);
+      }
+      const long long qbase = (long long)row * PADDED + col_base;
+      *reinterpret_cast<uint4 *>(&q_out[qbase]) = *reinterpret_cast<uint4 *>(&packed[0]);
+      *reinterpret_cast<uint4 *>(&q_out[qbase + 16]) = *reinterpret_cast<uint4 *>(&packed[16]);
+      e8_out[(long long)row * SCALE_BLOCKS + tid] = (uint8_t)e8;
+    }
+    __syncthreads();
+  }
+}
@@ -0,0 +1,99 @@
+#include <hip/hip_runtime.h>
+#include <hip/hip_bf16.h>
+
+#ifndef N_ELEMS
+#define N_ELEMS 47185920
+#endif
+#ifndef HIDDEN
+#define HIDDEN 2880
+#endif
+#ifndef PADDED
+#define PADDED 3072
+#endif
+#ifndef NUM_WG
+#define NUM_WG 1024
+#endif
+#ifndef THREADS_PER_WG
+#define THREADS_PER_WG 256
+#endif
+
+constexpr int ROWS = N_ELEMS / HIDDEN;
+constexpr int BLOCK = 32;
+constexpr int SCALE_BLOCKS = PADDED / BLOCK;
+constexpr int ELEMS_PER_THREAD = (HIDDEN + THREADS_PER_WG - 1) / THREADS_PER_WG;
+
+static_assert(N_ELEMS % HIDDEN == 0, "N_ELEMS must be divisible by HIDDEN");
+static_assert(HIDDEN % BLOCK == 0 && PADDED % BLOCK == 0 && PADDED >= HIDDEN,
+              "HIDDEN and PADDED must be block aligned");
+
+extern "C" __global__ __launch_bounds__(THREADS_PER_WG) void rmsnorm_mul_quantize_mxfp8_bwd(
+    __hip_bfloat16 *__restrict__ grad_x,
+    float *__restrict__ grad_weight_partial,
+    const __hip_bfloat16 *__restrict__ grad_q,
+    const __hip_bfloat16 *__restrict__ x,
+    const __hip_bfloat16 *__restrict__ weight,
+    const uint8_t *__restrict__ e8,
+    const float *__restrict__ rrms) {
+  __shared__ float reduce[THREADS_PER_WG];
+  const int tid = threadIdx.x;
+  const int wg = blockIdx.x;
+
+  float w[ELEMS_PER_THREAD];
+  float gw[ELEMS_PER_THREAD];
+  #pragma unroll
+  for (int i = 0; i < ELEMS_PER_THREAD; i++) {
+    int col = tid + i * THREADS_PER_WG;
+    w[i] = col < HIDDEN ? (float)weight[col] : 0.0f;
+    gw[i] = 0.0f;
+  }
+
+  for (int row = wg; row < ROWS; row += NUM_WG) {
+    const long long xbase = (long long)row * HIDDEN;
+    const long long qbase = (long long)row * PADDED;
+    const long long ebase = (long long)row * SCALE_BLOCKS;
+    const float r = rrms[row];
+    float xn[ELEMS_PER_THREAD];
+    float gxn[ELEMS_PER_THREAD];
+    float local_dot = 0.0f;
+
+    #pragma unroll
+    for (int i = 0; i < ELEMS_PER_THREAD; i++) {
+      const int col = tid + i * THREADS_PER_WG;
+      if (col < HIDDEN) {
+        const float xnf = (float)x[xbase + col] * r;
+        const unsigned se = (unsigned)(254 - (int)e8[ebase + col / BLOCK]) << 23;
+        const float qscale = __builtin_bit_cast(float, se);
+        const float gy = (float)grad_q[qbase + col] * qscale;
+        const float gxnf = gy * w[i];
+        xn[i] = xnf;
+        gxn[i] = gxnf;
+        gw[i] += gy * xnf;
+        local_dot = fmaf(gxnf, xnf, local_dot);
+      } else {
+        xn[i] = gxn[i] = 0.0f;
+      }
+    }
+
+    reduce[tid] = local_dot;
+    __syncthreads();
+    for (int s = THREADS_PER_WG / 2; s > 0; s >>= 1) {
+      if (tid < s) reduce[tid] += reduce[tid + s];
+      __syncthreads();
+    }
+    const float mean_term = reduce[0] * (1.0f / (float)HIDDEN);
+
+    #pragma unroll
+    for (int i = 0; i < ELEMS_PER_THREAD; i++) {
+      const int col = tid + i * THREADS_PER_WG;
+      if (col < HIDDEN) grad_x[xbase + col] = (__hip_bfloat16)(r * (gxn[i] - xn[i] * mean_term));
+    }
+    __syncthreads();
+  }
+
+  const long long gwbase = (long long)wg * HIDDEN;
+  #pragma unroll
+  for (int i = 0; i < ELEMS_PER_THREAD; i++) {
+    const int col = tid + i * THREADS_PER_WG;
+    if (col < HIDDEN) grad_weight_partial[gwbase + col] = gw[i];
+  }
+}
@@ -16,9 +16,12 @@ def _do_reset_device(pci_bus): os.system(f"sudo sh -c 'echo 1 > /sys/bus/pci/dev
 def _is_module_loaded(name: str) -> bool: return os.path.isdir(f"/sys/module/{name}")

 def cmd_remove_module(args):
-  modules = ["nvidia_drm", "nvidia_modeset", "nvidia_uvm", "nvidia", "ast"] if args.backend == "nv" else ["amdgpu"]
+  modules = ["nvidia_drm", "nvidia_modeset", "nvidia_uvm", "nvidia"] if args.backend == "nv" else ["amdgpu"]
  to_unload = [m for m in modules if _is_module_loaded(m)]
  if not to_unload: print("Kernel modules are not loaded")
+  elif getattr(args, "expect", False):
+    print(f"Kernel modules are loaded: {to_unload}")
+    sys.exit(1)
  else:
    print("Removing kernel modules:", ", ".join(to_unload))
    try: subprocess.run(["sudo", "modprobe", "-r", *to_unload], check=True)
@@ -60,17 +63,19 @@ def cmd_show_pids(args):

 def cmd_kill_pids(args):
  devs = scan_devs_based_on_lock(prefix:={"amd":"am", "nv":"nv"}[args.backend], args)
+  use_sudo = not getattr(args, "sudoless", False)

  for dev in devs:
    for i in range(128):
      if i > 0: time.sleep(0.2)

      try:
-        try: pid = subprocess.check_output(['sudo', 'lsof', temp(f'{prefix}_{dev}.lock')]).decode('utf-8').strip().split('\n')[1].split()[1]
+        try: pid = subprocess.check_output((['sudo'] if use_sudo else []) +
+                                           ['lsof', temp(f'{prefix}_{dev}.lock')]).decode('utf-8').strip().split('\n')[1].split()[1]
        except subprocess.CalledProcessError: break

        print(f"Killing process {pid} (which uses {dev})")
-        subprocess.run(['sudo', 'kill', '-9', pid], check=True)
+        subprocess.run((['sudo'] if use_sudo else []) + ['kill', '-9', pid], check=True)
      except subprocess.CalledProcessError as e:
        print(f"Failed to kill process for device {dev}: {e}", file=sys.stderr)

@@ -79,6 +84,7 @@ def add_common_commands(parent_subparsers):
  p_insmod.set_defaults(func=cmd_insert_module)

  p_rmmod = parent_subparsers.add_parser("rmmod", help="Remove a kernel module")
+  p_rmmod.add_argument("--expect", action="store_true", help="Just assert that module is already unloaded")
  p_rmmod.set_defaults(func=cmd_remove_module)

  p_reset = parent_subparsers.add_parser("reset", help="Reset a device")
@@ -91,17 +97,20 @@ def add_common_commands(parent_subparsers):

  p_reset = parent_subparsers.add_parser("kill_pids", help="Kill pids of processes using the device")
  p_reset.add_argument("--pci_bus", default="", help="PCI bus ID of the device")
+  p_reset.add_argument("--sudoless", action="store_true", help="Do not use sudo when detecting or killing pids")
  p_reset.set_defaults(func=cmd_kill_pids)

 if __name__ == "__main__":
  parser = argparse.ArgumentParser()
  backend_subparsers = parser.add_subparsers(dest="backend", required=True, metavar="{nv,amd}", help="Hardware backend to target")

-  nv_parser = backend_subparsers.add_parser("nv", help="NVIDIA GPUs")
+  nv_parser = backend_subparsers.add_parser("nv", aliases=["NV"], help="NVIDIA GPUs")
+  nv_parser.set_defaults(backend="nv")
  nv_commands = nv_parser.add_subparsers(dest="command", required=True)
  add_common_commands(nv_commands)

-  amd_parser = backend_subparsers.add_parser("amd", help="AMD GPUs")
+  amd_parser = backend_subparsers.add_parser("amd", aliases=["AMD"], help="AMD GPUs")
+  amd_parser.set_defaults(backend="amd")
  amd_commands = amd_parser.add_subparsers(dest="command", required=True)
  add_common_commands(amd_commands)

@@ -1,260 +1,226 @@
 from __future__ import annotations
-from typing import cast, Any, Callable
-import os, ctypes, struct, hashlib, functools, importlib, mmap, errno, array, contextlib, sys, weakref, itertools, collections, atexit
+from typing import cast
+import os, ctypes, struct, functools, importlib, mmap, errno, contextlib, sys, itertools, atexit
 assert sys.platform != 'win32'
 from dataclasses import dataclass
-from tinygrad.runtime.support.hcq2 import HCQ2Compiled, HCQAllocator, encode_kernargs_clike, make_cmdbuf
-from tinygrad.runtime.support.hcq2 import make_binary_patch
+from tinygrad.runtime.support.hcq2 import HCQ2Compiled, HCQAllocator, HWQueue, encode_submit, to_name
 from tinygrad.uop.ops import sint, UOp
-from tinygrad.device import Compiled, BufferSpec, Buffer, Device
+from tinygrad.device import BufferSpec, Buffer
 from tinygrad.dtype import dtypes
-from tinygrad.helpers import getenv, round_up, data64_le, DEBUG, PROFILE, ProfileEvent, lo32, hi32, colored, prod, ContextVar, TracingKey
-from tinygrad.helpers import VIZ, ceildiv, unwrap, pluralize, to_tuple
+from tinygrad.helpers import getenv, round_up, data64_le, DEBUG, PROFILE, lo32, hi32
+from tinygrad.helpers import ceildiv, unwrap, pluralize
 from tinygrad.renderer.cstyle import HIPRenderer, HIPCCRenderer
 from tinygrad.renderer.llvmir import AMDLLVMRenderer
-from tinygrad.runtime.autogen import kfd, hsa, sqtt, amdgpu_kd, amdgpu_drm
+from tinygrad.runtime.autogen import kfd, hsa, amdgpu_kd, amdgpu_drm
 from tinygrad.runtime.autogen.am import am
 from tinygrad.runtime.support.elf import elf_loader
 from tinygrad.runtime.support.hcq import FileIOInterface, HCQBuffer, MMIOInterface, hcq_filter_visible_devices
 from tinygrad.runtime.support.am.amdev import AMDev, AMMemoryManager
 from tinygrad.runtime.support.amd import AMDReg, AMDIP, import_module, import_soc, import_pmc
 from tinygrad.runtime.support.system import PCIIfaceBase, PCIAllocationMeta, USBPCIDevice, MAP_FIXED, MAP_NORESERVE
-from tinygrad.runtime.support.usb import USB3
+from tinygrad.runtime.support.usb import USB3, pm_usb_bufferize
 from tinygrad.runtime.support.memory import AddrSpace, BumpAllocator
-from tinygrad.runtime.ops_amd import SQTT, SQTT_ITRACE_SE_MASK, SQTT_LIMIT_SE, SQTT_SIMD_SEL, SQTT_TOKEN_EXCLUDE, PMC
-from tinygrad.runtime.ops_amd import EVENT_INDEX_PARTIAL_FLUSH, WAIT_REG_MEM_FUNCTION_EQ, WAIT_REG_MEM_FUNCTION_NEQ, WAIT_REG_MEM_FUNCTION_GEQ
+from tinygrad.runtime.ops_amd import SQTT, PMC
+from tinygrad.runtime.ops_amd import EVENT_INDEX_PARTIAL_FLUSH, WAIT_REG_MEM_FUNCTION_GEQ
 if getenv("IOCTL"): import extra.hip_gpu_driver.hip_ioctl  # noqa: F401 # pylint: disable=unused-import

-from tinygrad.engine.realize import get_runtime, pm_flatten_linear
-from tinygrad.uop import FastEnum, auto
-from tinygrad.uop.ops import Ops, UPat, PatternMatcher, graph_rewrite
+from tinygrad.engine.realize import get_call_arg_uops, get_call_var_uops
+from tinygrad.uop.ops import Ops, UPat, PatternMatcher

 # *****************
 # PM4

-class PM4Ops(FastEnum):
-  SET_SH_REG = auto(); SET_UCONFIG_REG = auto(); WAIT_REG_MEM = auto(); ACQUIRE_MEM = auto()  # noqa: E702
-  RELEASE_MEM = auto(); DISPATCH_DIRECT = auto(); EVENT_WRITE = auto()  # noqa: E702
+def _queue_args(hq:HWQueue, q) -> list[UOp]: # the ring and its pointers, tagged {name}_{queue} like the device's bufferize rules
+  shapes = [("ring", (q.ring.size,), q.ring.dtype)] + [(n, (1,), dtypes.uint64) for n in ("write_ptr", "doorbell", "put_value")]
+  return [UOp.placeholder(s, d, 0, device=hq.devs, volatile=True, tag=to_name(n, hq.queue)) for n, s, d in shapes]

-def pkt3(ctx, op:PM4Ops, *vals):
-  return UOp(Ops.INS, arg=op, src=tuple(UOp.const(x, dtypes.uint32)
-    for x in (ctx.pm4.PACKET3(getattr(ctx.pm4, f"PACKET3_{op.name}"), len(vals) - 1), *vals)))
+def _dw(vals) -> int: return sum(2 if isinstance(x, UOp) and x.dtype.itemsize == 8 else 1 for x in vals)

-def wreg(ctx, reg:AMDReg, *args:sint, **kwargs:int):
-  if bool(args) == bool(kwargs): raise RuntimeError('One (and only one) of *args or **kwargs must be specified')
-  if ctx.pm4.PACKET3_SET_SH_REG_START <= reg.addr[0] < ctx.pm4.PACKET3_SET_SH_REG_END:
-    op, set_packet_start = PM4Ops.SET_SH_REG, ctx.pm4.PACKET3_SET_SH_REG_START
-  elif ctx.pm4.PACKET3_SET_UCONFIG_REG_START <= reg.addr[0] < ctx.pm4.PACKET3_SET_UCONFIG_REG_START + 2**16-1:
-    op, set_packet_start = PM4Ops.SET_UCONFIG_REG, ctx.pm4.PACKET3_SET_UCONFIG_REG_START
-  else: raise RuntimeError(f'Cannot set {reg.name} ({reg.addr[0]}) via pm4 packet')
-  return pkt3(ctx, op, reg.addr[0] - set_packet_start, *(args or (reg.encode(**kwargs),)))
+class AMDComputeQueue(HWQueue):
+  q_rewrite = PatternMatcher([
+    (UPat(Ops.CALL, src=(UPat(Ops.PROGRAM, name="prg"),), name="call", allow_any_len=True), lambda ctx, call, prg: ctx.exec(call, prg)),
+    (UPat(Ops.INS, arg=("barrier", dtypes.void)), lambda ctx: ctx.memory_barrier()),
+    (UPat(Ops.INS, arg=("wait", dtypes.void), src=(UPat(name="dst"), UPat(name="val"))), lambda ctx, dst, val: ctx.wait(dst, val)),
+    (UPat(Ops.INS, arg=("timestamp", dtypes.void), src=(UPat(name="dst"),)), lambda ctx, dst: ctx.timestamp(dst)),
+    (UPat(Ops.INS, arg=("store", dtypes.void), src=(UPat(name="dst"), UPat(name="val"))),
+     lambda ctx, dst, val: ctx.signal(dst, val)),
+  ])

-def wait_reg_mem(ctx, value, mask=0xffffffff, mem=None, reg=None, reg_done=0, op=WAIT_REG_MEM_FUNCTION_GEQ):
-  wrm_info_dw = ctx.pm4.WAIT_REG_MEM_MEM_SPACE(int(mem is not None)) | ctx.pm4.WAIT_REG_MEM_OPERATION(int(mem is None and reg_done > 0)) \
-              | ctx.pm4.WAIT_REG_MEM_FUNCTION(op) | ctx.pm4.WAIT_REG_MEM_ENGINE(0)
-  return pkt3(ctx, PM4Ops.WAIT_REG_MEM, wrm_info_dw, *(data64_le(mem) if mem is not None else (reg, reg_done)), value, mask, 4)
+  def __init__(self, ctx, submit):
+    super().__init__(ctx, submit)
+    self.pm4, self.gc, self.soc, self.nbio, self.target = self.dev.pm4, self.dev.gc, self.dev.soc, self.dev.nbio, self.dev.target

-def acquire_mem(ctx, addr=0x0, sz=(1 << 64)-1, gli=1, glm=1, glk=1, glv=1, gl1=1, gl2=1):
-  if ctx.target[0] != 9:
-    cache_flags_dw = ctx.pm4.PACKET3_ACQUIRE_MEM_GCR_CNTL_GLI_INV(gli) \
-                   | ctx.pm4.PACKET3_ACQUIRE_MEM_GCR_CNTL_GLM_INV(glm) | ctx.pm4.PACKET3_ACQUIRE_MEM_GCR_CNTL_GLM_WB(glm) \
-                   | ctx.pm4.PACKET3_ACQUIRE_MEM_GCR_CNTL_GLK_INV(glk) | ctx.pm4.PACKET3_ACQUIRE_MEM_GCR_CNTL_GLK_WB(glk) \
-                   | ctx.pm4.PACKET3_ACQUIRE_MEM_GCR_CNTL_GLV_INV(glv) | ctx.pm4.PACKET3_ACQUIRE_MEM_GCR_CNTL_GL1_INV(gl1) \
-                   | ctx.pm4.PACKET3_ACQUIRE_MEM_GCR_CNTL_GL2_INV(gl2) | ctx.pm4.PACKET3_ACQUIRE_MEM_GCR_CNTL_GL2_WB(gl2)
-    return pkt3(ctx, PM4Ops.ACQUIRE_MEM, 0, *data64_le(sz), *data64_le(addr), 0, cache_flags_dw)
-  cp_coher_cntl = ctx.pm4.PACKET3_ACQUIRE_MEM_CP_COHER_CNTL_SH_ICACHE_ACTION_ENA(gli) | \
-                  ctx.pm4.PACKET3_ACQUIRE_MEM_CP_COHER_CNTL_SH_KCACHE_ACTION_ENA(glk) | \
-                  ctx.pm4.PACKET3_ACQUIRE_MEM_CP_COHER_CNTL_TC_ACTION_ENA(gl2) | \
-                  ctx.pm4.PACKET3_ACQUIRE_MEM_CP_COHER_CNTL_TCL1_ACTION_ENA(gl1) | \
-                  ctx.pm4.PACKET3_ACQUIRE_MEM_CP_COHER_CNTL_TC_WB_ACTION_ENA(gl2)
-  return pkt3(ctx, PM4Ops.ACQUIRE_MEM, cp_coher_cntl, *data64_le(sz), *data64_le(addr), 0x0000000A)
+  def pkt3(self, cmd, *vals): self.q(self.pm4.PACKET3(cmd, _dw(vals) - 1), *vals)

-def release_mem(ctx, address=0x0, value=0, data_sel=0, int_sel=2, ctxid=0, cache_flush=False):
-  if ctx.target[0] != 9:
-    cache_flags_dw = 0 if not cache_flush else (ctx.pm4.PACKET3_RELEASE_MEM_GCR_GLV_INV | ctx.pm4.PACKET3_RELEASE_MEM_GCR_GL1_INV \
-                   | ctx.pm4.PACKET3_RELEASE_MEM_GCR_GL2_INV | ctx.pm4.PACKET3_RELEASE_MEM_GCR_GLM_WB \
-                   | ctx.pm4.PACKET3_RELEASE_MEM_GCR_GLM_INV | ctx.pm4.PACKET3_RELEASE_MEM_GCR_GL2_WB | ctx.pm4.PACKET3_RELEASE_MEM_GCR_SEQ)
-    event_dw = ctx.pm4.PACKET3_RELEASE_MEM_EVENT_TYPE(ctx.pm4.CACHE_FLUSH_AND_INV_TS_EVENT) \
-             | ctx.pm4.PACKET3_RELEASE_MEM_EVENT_INDEX(ctx.pm4.event_index__mec_release_mem__end_of_pipe)
-    memsel_dw = ctx.pm4.PACKET3_RELEASE_MEM_DATA_SEL(data_sel) | ctx.pm4.PACKET3_RELEASE_MEM_INT_SEL(int_sel) \
-              | ctx.pm4.PACKET3_RELEASE_MEM_DST_SEL(0)
-  else:
-    cache_flags_dw = 0 if not cache_flush else (ctx.pm4.EOP_TC_WB_ACTION_EN | ctx.pm4.EOP_TC_NC_ACTION_EN)
-    event_dw = ctx.pm4.EVENT_TYPE(ctx.pm4.CACHE_FLUSH_AND_INV_TS_EVENT) | ctx.pm4.EVENT_INDEX(ctx.pm4.event_index__mec_release_mem__end_of_pipe)
-    memsel_dw = ctx.pm4.DATA_SEL(data_sel) | ctx.pm4.INT_SEL(int_sel)
-    ctxid = 0
-  return pkt3(ctx, PM4Ops.RELEASE_MEM, event_dw | cache_flags_dw, memsel_dw, *data64_le(address), *data64_le(value), ctxid)
+  def wreg(self, reg:AMDReg, *args:sint, **kwargs:int):
+    if bool(args) == bool(kwargs): raise RuntimeError('One (and only one) of *args or **kwargs must be specified')
+    if self.pm4.PACKET3_SET_SH_REG_START <= reg.addr[0] < self.pm4.PACKET3_SET_SH_REG_END:
+      set_packet, set_packet_start = self.pm4.PACKET3_SET_SH_REG, self.pm4.PACKET3_SET_SH_REG_START
+    elif self.pm4.PACKET3_SET_UCONFIG_REG_START <= reg.addr[0] < self.pm4.PACKET3_SET_UCONFIG_REG_START + 2**16-1:
+      set_packet, set_packet_start = self.pm4.PACKET3_SET_UCONFIG_REG, self.pm4.PACKET3_SET_UCONFIG_REG_START
+    else: raise RuntimeError(f'Cannot set {reg.name} ({reg.addr[0]}) via pm4 packet')
+    self.pkt3(set_packet, reg.addr[0] - set_packet_start, *(args or (reg.encode(**kwargs),)))

-def memory_barrier(ctx):
-  pf = '' if ctx.nbio.version[0] == 2 else '0' if ctx.nbio.version[:2] != (7, 11) else '1'
-  return UOp(Ops.LINEAR, dtypes.void, (
-    wait_reg_mem(ctx, reg=getattr(ctx.nbio, f'regBIF_BX_PF{pf}_GPU_HDP_FLUSH_REQ').addr[0],
-                 reg_done=getattr(ctx.nbio, f'regBIF_BX_PF{pf}_GPU_HDP_FLUSH_DONE').addr[0], value=0xffffffff),
-    acquire_mem(ctx)))
+  def wait_reg_mem(self, value, mask=0xffffffff, mem=None, reg=None, reg_done=0, op=WAIT_REG_MEM_FUNCTION_GEQ):
+    wrm_info_dw = self.pm4.WAIT_REG_MEM_MEM_SPACE(int(mem is not None)) | self.pm4.WAIT_REG_MEM_OPERATION(int(mem is None and reg_done > 0)) \
+                | self.pm4.WAIT_REG_MEM_FUNCTION(op) | self.pm4.WAIT_REG_MEM_ENGINE(0)
+    self.pkt3(self.pm4.PACKET3_WAIT_REG_MEM, wrm_info_dw, *((mem,) if mem is not None else (reg, reg_done)), value, mask, 4)

-def pm4_wait(ctx, dst, val): return wait_reg_mem(ctx, val, mem=dst.getaddr(ctx.devs))
+  def acquire_mem(self, addr=0x0, sz=(1 << 64)-1, gli=1, glm=1, glk=1, glv=1, gl1=1, gl2=1):
+    if self.target[0] != 9:
+      cache_flags_dw = self.pm4.PACKET3_ACQUIRE_MEM_GCR_CNTL_GLI_INV(gli) \
+                     | self.pm4.PACKET3_ACQUIRE_MEM_GCR_CNTL_GLM_INV(glm) | self.pm4.PACKET3_ACQUIRE_MEM_GCR_CNTL_GLM_WB(glm) \
+                     | self.pm4.PACKET3_ACQUIRE_MEM_GCR_CNTL_GLK_INV(glk) | self.pm4.PACKET3_ACQUIRE_MEM_GCR_CNTL_GLK_WB(glk) \
+                     | self.pm4.PACKET3_ACQUIRE_MEM_GCR_CNTL_GLV_INV(glv) | self.pm4.PACKET3_ACQUIRE_MEM_GCR_CNTL_GL1_INV(gl1) \
+                     | self.pm4.PACKET3_ACQUIRE_MEM_GCR_CNTL_GL2_INV(gl2) | self.pm4.PACKET3_ACQUIRE_MEM_GCR_CNTL_GL2_WB(gl2)
+      return self.pkt3(self.pm4.PACKET3_ACQUIRE_MEM, 0, *data64_le(sz), *data64_le(addr), 0, cache_flags_dw)
+    cp_coher_cntl = self.pm4.PACKET3_ACQUIRE_MEM_CP_COHER_CNTL_SH_ICACHE_ACTION_ENA(gli) | \
+                    self.pm4.PACKET3_ACQUIRE_MEM_CP_COHER_CNTL_SH_KCACHE_ACTION_ENA(glk) | \
+                    self.pm4.PACKET3_ACQUIRE_MEM_CP_COHER_CNTL_TC_ACTION_ENA(gl2) | \
+                    self.pm4.PACKET3_ACQUIRE_MEM_CP_COHER_CNTL_TCL1_ACTION_ENA(gl1) | \
+                    self.pm4.PACKET3_ACQUIRE_MEM_CP_COHER_CNTL_TC_WB_ACTION_ENA(gl2)
+    return self.pkt3(self.pm4.PACKET3_ACQUIRE_MEM, cp_coher_cntl, *data64_le(sz), *data64_le(addr), 0x0000000A)

-def pm4_barrier(ctx): return memory_barrier(ctx)
+  def release_mem(self, address=0x0, value=0, data_sel=0, int_sel=2, ctxid=0, cache_flush=False):
+    if self.target[0] != 9:
+      cache_flags_dw = 0 if not cache_flush else (self.pm4.PACKET3_RELEASE_MEM_GCR_GLV_INV | self.pm4.PACKET3_RELEASE_MEM_GCR_GL1_INV \
+                     | self.pm4.PACKET3_RELEASE_MEM_GCR_GL2_INV | self.pm4.PACKET3_RELEASE_MEM_GCR_GLM_WB \
+                     | self.pm4.PACKET3_RELEASE_MEM_GCR_GLM_INV | self.pm4.PACKET3_RELEASE_MEM_GCR_GL2_WB | self.pm4.PACKET3_RELEASE_MEM_GCR_SEQ)
+      event_dw = self.pm4.PACKET3_RELEASE_MEM_EVENT_TYPE(self.pm4.CACHE_FLUSH_AND_INV_TS_EVENT) \
+               | self.pm4.PACKET3_RELEASE_MEM_EVENT_INDEX(self.pm4.event_index__mec_release_mem__end_of_pipe)
+      memsel_dw = self.pm4.PACKET3_RELEASE_MEM_DATA_SEL(data_sel) | self.pm4.PACKET3_RELEASE_MEM_INT_SEL(int_sel) \
+                | self.pm4.PACKET3_RELEASE_MEM_DST_SEL(0)
+    else:
+      cache_flags_dw = 0 if not cache_flush else (self.pm4.EOP_TC_WB_ACTION_EN | self.pm4.EOP_TC_NC_ACTION_EN)
+      event_dw = self.pm4.EVENT_TYPE(self.pm4.CACHE_FLUSH_AND_INV_TS_EVENT) | \
+                 self.pm4.EVENT_INDEX(self.pm4.event_index__mec_release_mem__end_of_pipe)
+      memsel_dw = self.pm4.DATA_SEL(data_sel) | self.pm4.INT_SEL(int_sel)
+      ctxid = 0
+    addr_w = address if isinstance(address, UOp) else UOp.const(address, dtypes.uint64)
+    val_w = value.cast(dtypes.uint64) if isinstance(value, UOp) else UOp.const(value, dtypes.uint64)
+    self.pkt3(self.pm4.PACKET3_RELEASE_MEM, event_dw | cache_flags_dw, memsel_dw, addr_w, val_w, ctxid)

-def pm4_store(ctx, dst, val):
-  if val.op is Ops.BINARY: return None
-  return release_mem(ctx, dst.getaddr(ctx.devs), val, ctx.pm4.data_sel__mec_release_mem__send_32_bit_low,
-                     ctx.pm4.int_sel__mec_release_mem__send_interrupt_after_write_confirm, cache_flush=True)
+  def memory_barrier(self):
+    pf = '' if self.nbio.version[0] == 2 else '0' if self.nbio.version[:2] != (7, 11) else '1'
+    self.wait_reg_mem(reg=getattr(self.nbio, f'regBIF_BX_PF{pf}_GPU_HDP_FLUSH_REQ').addr[0],
+                      reg_done=getattr(self.nbio, f'regBIF_BX_PF{pf}_GPU_HDP_FLUSH_DONE').addr[0], value=0xffffffff)
+    self.acquire_mem()

-def pm4_timestamp(ctx, dst):
-  return release_mem(ctx, dst.getaddr(ctx.devs), 0, ctx.pm4.data_sel__mec_release_mem__send_gpu_clock_counter,
-                     ctx.pm4.int_sel__mec_release_mem__none)
+  def exec(self, call:UOp, prg:UOp):
+    data, lib = amd_build_program(self.dev, prg, self.devs)
+    info = prg.arg

-def pm4_program(ctx, call, prg):
-  data, info = prg.arg
-  lib_gpu = prg.src[0]
-  args = encode_kernargs_clike(call, prg, ctx.devs)
-  prog_addr = lib_gpu.getaddr(ctx.devs) + data.entry_point_offset
-  scratch_addr = UOp.placeholder((data.private_segment_size,), dtypes.uint8, 0, device=ctx.devs).rtag("scratch").getaddr(ctx.devs)
-  args_addr = args.getaddr(ctx.devs)
+    # kernargs: a nested blob linear inside a getaddr, packed into the tail of the cmdbuf
+    ka_words = [get_call_arg_uops(call)[gi].getaddr(self.devs) for gi in info.globals] + \
+               [b.ccast(v.dtype) for v, b in zip(info.vars, get_call_var_uops(call, prg))] # a bound value is a bare const, the var has the width
+    pad = data.kernargs_alloc_size - sum(w.dtype.itemsize for w in ka_words)
+    assert pad >= 0 and pad % 4 == 0, f"bad kernargs padding {pad}"
+    ka = UOp(Ops.LINEAR, src=tuple(ka_words) + (UOp.const(0, dtypes.uint32),) * (pad // 4))

-  user_regs = []
-  if data.enable_private_segment_sgpr:
-    scratch_hilo = data64_le(scratch_addr)
-    user_regs = [scratch_hilo[0], scratch_hilo[1] | 1 << 31, 0xffffffff, 0x20c14000]
-  if data.enable_dispatch_ptr: user_regs += [*data64_le(args_addr + data.kernargs_segment_size)]
-  user_regs += [*data64_le(args_addr)]
+    prog_addr = lib.getaddr(self.devs) + data.entry_point_offset
+    scratch_addr = UOp.placeholder((data.private_segment_size,), dtypes.uint8, 0, device=self.devs).rtag("scratch").getaddr(self.devs)
+    args_addr = ka.getaddr(self.devs)

-  dispatch_init = ctx.gc.regCOMPUTE_DISPATCH_INITIATOR.encode(
-    **({'cs_w32_en': int(data.wave32)} if ctx.target[0] != 9 else {}), force_start_at_000=1, compute_shader_en=1)
-  ins = [acquire_mem(ctx, gli=0, gl2=0),
-    wreg(ctx, ctx.gc.regCOMPUTE_PGM_LO, *data64_le(prog_addr >> 8)),
-    wreg(ctx, ctx.gc.regCOMPUTE_PGM_RSRC1, data.rsrc1, data.rsrc2),
-    wreg(ctx, ctx.gc.regCOMPUTE_PGM_RSRC3, data.rsrc3),
-    wreg(ctx, ctx.gc.regCOMPUTE_TMPRING_SIZE, ctx.tmpring_size(data.private_segment_size))]
-  ins += [wreg(ctx, ctx.gc.regCOMPUTE_DISPATCH_SCRATCH_BASE_LO, *data64_le((scratch_addr + data.private_segment_size // ctx.xccs * xcc_id) >> 8))
-          for xcc_id in range(ctx.xccs)]
-  ins += [wreg(ctx, ctx.gc.regCOMPUTE_RESTART_X, 0, 0, 0),
-    wreg(ctx, ctx.gc.regCOMPUTE_USER_DATA_0, *user_regs),
-    wreg(ctx, ctx.gc.regCOMPUTE_RESOURCE_LIMITS, ctx.gc.regCOMPUTE_RESOURCE_LIMITS.encode(waves_per_sh=getenv("WAVES_PER_SH"))),
-    wreg(ctx, ctx.gc.regCOMPUTE_START_X, 0, 0, 0, *(info.local_size or (1, 1, 1)), 0, 0),
-    pkt3(ctx, PM4Ops.DISPATCH_DIRECT, *info.global_size, dispatch_init),
-    pkt3(ctx, PM4Ops.EVENT_WRITE, ctx.pm4.EVENT_TYPE(ctx.soc.CS_PARTIAL_FLUSH) | ctx.pm4.EVENT_INDEX(EVENT_INDEX_PARTIAL_FLUSH))]
-  return UOp(Ops.LINEAR, dtypes.void, tuple(ins))
+    user_regs:list = []
+    if data.enable_private_segment_sgpr: user_regs = [scratch_addr | (1 << 63), 0xffffffff, 0x20c14000]
+    if data.enable_dispatch_ptr: user_regs += [args_addr + data.kernargs_segment_size]
+    user_regs += [args_addr]

-pm_pm4_opsel = PatternMatcher([
-  (UPat(Ops.CALL, src=(UPat(Ops.PROGRAM, name="prg"),), name="call", allow_any_len=True), pm4_program),
+    dispatch_init = self.gc.regCOMPUTE_DISPATCH_INITIATOR.encode(
+      **({'cs_w32_en': int(data.wave32)} if self.target[0] != 9 else {}), force_start_at_000=1, compute_shader_en=1)
+    self.acquire_mem(gli=0, gl2=0)
+    self.wreg(self.gc.regCOMPUTE_PGM_LO, prog_addr >> 8)
+    self.wreg(self.gc.regCOMPUTE_PGM_RSRC1, data.rsrc1, data.rsrc2)
+    self.wreg(self.gc.regCOMPUTE_PGM_RSRC3, data.rsrc3)
+    self.wreg(self.gc.regCOMPUTE_TMPRING_SIZE, self.dev.tmpring_size(data.private_segment_size))
+    for xcc_id in range(self.dev.xccs):
+      self.wreg(self.gc.regCOMPUTE_DISPATCH_SCRATCH_BASE_LO, (scratch_addr + data.private_segment_size // self.dev.xccs * xcc_id) >> 8)
+    self.wreg(self.gc.regCOMPUTE_RESTART_X, 0, 0, 0)
+    self.wreg(self.gc.regCOMPUTE_USER_DATA_0, *user_regs)
+    self.wreg(self.gc.regCOMPUTE_RESOURCE_LIMITS, self.gc.regCOMPUTE_RESOURCE_LIMITS.encode(waves_per_sh=getenv("WAVES_PER_SH")))
+    self.wreg(self.gc.regCOMPUTE_START_X, 0, 0, 0, *info.local_size, 0, 0)
+    self.pkt3(self.pm4.PACKET3_DISPATCH_DIRECT, *info.global_size, dispatch_init)
+    self.pkt3(self.pm4.PACKET3_EVENT_WRITE, self.pm4.EVENT_TYPE(self.soc.CS_PARTIAL_FLUSH) | self.pm4.EVENT_INDEX(EVENT_INDEX_PARTIAL_FLUSH))

-  (UPat(Ops.INS, arg="wait", src=(UPat(name="dst"), UPat(name="val"))), pm4_wait),
-  (UPat(Ops.INS, arg="barrier"), pm4_barrier),
-  (UPat(Ops.INS, arg="timestamp", src=(UPat(name="dst"),)), pm4_timestamp),
-  (UPat(Ops.INS, arg="store", src=(UPat((Ops.BUFFER, Ops.PARAM), name="dst"), UPat(name="val"))), pm4_store),
-])
+  def wait(self, signal:UOp, value:UOp): self.wait_reg_mem(value.cast(dtypes.uint32), mem=signal.getaddr(self.devs))

-def pm4_submit(ctx, lin):
-  # ensure compute queues are allocated
-  for d in (devs:=ctx.devs): q = Device[d].compute_queue
-  ring, wptr, doorbell, put_ptr = (UOp.placeholder((b.size,), b.dtype, 0, device=devs).rtag(f"COMPUTE:0_{name}")
-    for name, b in (("ring", q.ring), ("write_ptr", q.write_ptr), ("doorbell", q.doorbell), ("put_value", q.put_value)))
+  def timestamp(self, signal:UOp):
+    self.release_mem(signal.getaddr(self.devs) + UOp.const(8, dtypes.uint64), 0, self.pm4.data_sel__mec_release_mem__send_gpu_clock_counter,
+                     self.pm4.int_sel__mec_release_mem__none)

-  # the host fence at the start of the batch guarantees the ib is free to reuse
-  size_dw = sum(len(ins.src) for ins in lin.src)
-  assert size_dw < (1 << 20), f"indirect buffer of {size_dw} dwords doesn't fit one packet"
+  def signal(self, signal:UOp, value:UOp):
+    self.release_mem(signal.getaddr(self.devs), value, self.pm4.data_sel__mec_release_mem__send_32_bit_low,
+                     self.pm4.int_sel__mec_release_mem__send_interrupt_after_write_confirm, cache_flush=True)

-  ib = UOp.placeholder((size_dw,), dtypes.uint32, next(UOp.unique_num), device=devs, volatile=True).rtag("cmdbuf")
-  cmdbuf = make_cmdbuf(lin, devs, buf=ib)
+  def submit(self, cmdbuf:UOp) -> UOp:
+    q = self.dev.compute_queue

-  # the ring itself only carries a packet pointing at the ib, wrapping the ring
-  put = put_ptr.index(zero:=UOp.const(0, dtypes.int))
-  pkt = (ctx.pm4.PACKET3(ctx.pm4.PACKET3_INDIRECT_BUFFER, 2), *data64_le(cmdbuf.getaddr(devs)), size_dw | ctx.pm4.INDIRECT_BUFFER_VALID)
-  write_pkt = UOp.barrier(*[ring.index(((put + off) % q.ring.size).cast(dtypes.int)).store(UOp.const(x, dtypes.uint32)) for off,x in enumerate(pkt)])
+    ring, wptr, doorbell, put = _queue_args(self, q)

-  # advance the put/write pointers past the packet
-  bump_put_ptr = put_ptr.index(zero).store(put + len(pkt))
-  bump_wptr = wptr.index(zero).store(put + len(pkt))
-  flush = UOp.barrier(write_pkt, bump_put_ptr, bump_wptr)
-  return doorbell.after(flush).index(zero).store(put + len(pkt))
-
-pm_pm4_submit = PatternMatcher([(UPat(Ops.LINEAR, name="lin"), pm4_submit)])
+    size_dw = cmdbuf.max_numel() // 4
+    p = put.index(0).load()
+    i = UOp.range(size_dw, 10, dtype=dtypes.int, src=(cmdbuf,))
+    copy = ring.index(((p + i.cast(p.dtype)) % q.ring.size).cast(dtypes.int)).store(cmdbuf.bitcast(dtypes.uint32).index(i).load()).end(i)
+    next_put = p + size_dw
+    flush = UOp.barrier(copy, put.index(0).store(next_put), wptr.index(0).store(next_put))
+    return doorbell.after(flush).index(0).store(next_put)

 # *****************
 # SDMA

-class SDMAOps(FastEnum): COPY = auto(); POLL_REGMEM = auto(); FENCE = auto(); TRAP = auto(); TIMESTAMP = auto()  # noqa: E702
+class AMDSDMAQueue(HWQueue):
+  q_rewrite = PatternMatcher([
+    (UPat(Ops.CALL, src=(UPat(Ops.COPY),), name="call", allow_any_len=True), lambda ctx, call: ctx.copy(call)),
+    (UPat(Ops.INS, arg=("barrier", dtypes.void)), lambda ctx: ()),
+    (UPat(Ops.INS, arg=("wait", dtypes.void), src=(UPat(name="dst"), UPat(name="val"))), lambda ctx, dst, val: ctx.wait(dst, val)),
+    (UPat(Ops.INS, arg=("timestamp", dtypes.void), src=(UPat(name="dst"),)), lambda ctx, dst: ctx.timestamp(dst)),
+    (UPat(Ops.INS, arg=("store", dtypes.void), src=(UPat(name="dst"), UPat(name="val"))),
+     lambda ctx, dst, val: ctx.signal(dst, val)),
+  ])

-def sdma_copy(ctx, call):
-  sz = call.src[2].max_numel() * call.src[2].dtype.itemsize
-  src_addr, dst_addr = call.src[2].getaddr(ctx.devs), call.src[1].getaddr(ctx.devs)
-  return call.ins(SDMAOps.COPY, src=tuple(UOp.const(x, dtypes.uint32) for off in range(0, sz, ctx.max_copy_size) for x in (
-    ctx.sdma.SDMA_OP_COPY | ctx.sdma.SDMA_PKT_COPY_LINEAR_HEADER_SUB_OP(ctx.sdma.SDMA_SUBOP_COPY_LINEAR),
-    ctx.sdma.SDMA_PKT_COPY_LINEAR_COUNT_COUNT(min(sz-off, ctx.max_copy_size)-1), 0,
-    *data64_le(src_addr+UOp.const(off, dtypes.uint64)), *data64_le(dst_addr+UOp.const(off, dtypes.uint64)))))
+  def __init__(self, ctx, submit):
+    super().__init__(ctx, submit)
+    self.sdma, self.target, self.max_copy_size = self.dev.sdma, self.dev.target, self.dev.max_copy_size

-def sdma_wait(ctx, ins, dst, val):
-  op = ctx.sdma.SDMA_OP_POLL_REGMEM | ctx.sdma.SDMA_PKT_POLL_REGMEM_HEADER_FUNC(WAIT_REG_MEM_FUNCTION_GEQ) \
-     | ctx.sdma.SDMA_PKT_POLL_REGMEM_HEADER_MEM_POLL(1)
-  return ins.ins(SDMAOps.POLL_REGMEM, src=tuple(UOp.const(x, dtypes.uint32) for x in (
-    op, *data64_le(dst.getaddr(ctx.devs)), val, 0xffffffff,
-    ctx.sdma.SDMA_PKT_POLL_REGMEM_DW5_INTERVAL(0x04) | ctx.sdma.SDMA_PKT_POLL_REGMEM_DW5_RETRY_COUNT(0xfff))))
+  def copy(self, call:UOp):
+    sz = call.src[2].max_numel() * call.src[2].dtype.itemsize
+    hdr = self.sdma.SDMA_OP_COPY | self.sdma.SDMA_PKT_COPY_LINEAR_HEADER_SUB_OP(self.sdma.SDMA_SUBOP_COPY_LINEAR)
+    for off in range(0, sz, self.max_copy_size):
+      self.q(hdr, self.sdma.SDMA_PKT_COPY_LINEAR_COUNT_COUNT(min(sz-off, self.max_copy_size)-1), 0,
+             *(a + UOp.const(off, dtypes.uint64) if off else a for a in (call.src[2].getaddr(self.devs), call.src[1].getaddr(self.devs))))

-def sdma_store(ctx, ins, dst, val):
-  op = ctx.sdma.SDMA_OP_FENCE | (ctx.sdma.SDMA_PKT_FENCE_HEADER_MTYPE(3) if ctx.target[0] != 9 else 0)
-  return UOp(Ops.LINEAR, src=(
-    ins.ins(SDMAOps.FENCE, src=tuple(UOp.const(x, dtypes.uint32) for x in (op, *data64_le(dst.getaddr(ctx.devs)), val))),
-    ins.ins(SDMAOps.TRAP, src=tuple(UOp.const(x, dtypes.uint32) for x in (ctx.sdma.SDMA_OP_TRAP, 0)))))
+  def wait(self, signal:UOp, value:UOp):
+    op = self.sdma.SDMA_OP_POLL_REGMEM | self.sdma.SDMA_PKT_POLL_REGMEM_HEADER_FUNC(WAIT_REG_MEM_FUNCTION_GEQ) \
+       | self.sdma.SDMA_PKT_POLL_REGMEM_HEADER_MEM_POLL(1)
+    self.q(op, signal.getaddr(self.devs), value.cast(dtypes.uint32), 0xffffffff,
+           self.sdma.SDMA_PKT_POLL_REGMEM_DW5_INTERVAL(0x04) | self.sdma.SDMA_PKT_POLL_REGMEM_DW5_RETRY_COUNT(0xfff))

-def sdma_timestamp(ctx, ins, dst):
-  op = ctx.sdma.SDMA_OP_TIMESTAMP | ctx.sdma.SDMA_PKT_TIMESTAMP_GET_HEADER_SUB_OP(ctx.sdma.SDMA_SUBOP_TIMESTAMP_GET_GLOBAL)
-  return ins.ins(SDMAOps.TIMESTAMP, src=tuple(UOp.const(x, dtypes.uint32) for x in (op, *data64_le(dst.getaddr(ctx.devs)))))
+  def timestamp(self, signal:UOp):
+    self.q(self.sdma.SDMA_OP_TIMESTAMP | self.sdma.SDMA_PKT_TIMESTAMP_GET_HEADER_SUB_OP(self.sdma.SDMA_SUBOP_TIMESTAMP_GET_GLOBAL),
+           signal.getaddr(self.devs) + UOp.const(8, dtypes.uint64))

-pm_sdma_opsel = PatternMatcher([
-  (UPat(Ops.CALL, src=(UPat(Ops.COPY),), name="call", allow_any_len=True), sdma_copy),
+  def signal(self, signal:UOp, value:UOp): # a fence packet then a trap
+    op = self.sdma.SDMA_OP_FENCE | (self.sdma.SDMA_PKT_FENCE_HEADER_MTYPE(3) if self.target[0] != 9 else 0)
+    self.q(op, signal.getaddr(self.devs), value.cast(dtypes.uint32), self.sdma.SDMA_OP_TRAP, 0)

-  (UPat(Ops.INS, arg="barrier"), lambda: UOp(Ops.NOOP, dtypes.void, ())),
-  (UPat(Ops.INS, arg="wait", src=(UPat(name="dst"), UPat(name="val")), name="ins"), sdma_wait),
-  (UPat(Ops.INS, arg="timestamp", src=(UPat(name="dst"),), name="ins"), sdma_timestamp),
-  (UPat(Ops.INS, arg="store", src=(UPat((Ops.BUFFER, Ops.PARAM), name="dst"), UPat(name="val")), name="ins"), sdma_store),
-])
+  def submit(self, cmdbuf:UOp) -> UOp:
+    # sdma needs the cmdbuf contiguous in the ring: if it won't fit before the ring end, restart at 0 and zero the tail
+    q = unwrap(self.dev.sdma_queue(int(self.queue.split(":")[1])))

-def sdma_submit(cmdbuf, devs):
-  # the cmdbuf to submit + the patch writes that fill it
-  size_dw, zero = cmdbuf.nbytes() // dtypes.uint32.itemsize, UOp.const(0, dtypes.int)
+    ring, wptr, doorbell, put = _queue_args(self, q)

-  # the sdma queue's ring and its host-side ring/write/put pointers
-  for d in devs: q = Device[d].sdma_queue(0)
-  ring, wptr, doorbell, put_ptr = (UOp.placeholder((b.size,), b.dtype, 0, device=devs).rtag(f"COPY:0_{name}")
-    for name, b in (("ring", q.ring), ("write_ptr", q.write_ptr), ("doorbell", q.doorbell), ("put_value", q.put_value)))
-
-  # sdma needs the cmdbuf contiguous: if it won't fit before the ring end, restart at 0 and zero the tail
-  put_b = put_ptr.index(zero)
-  tail_off_dw = ((put_b % (q.ring.size * 4)) // 4).cast(dtypes.int)
-  fits = (size_dw <= q.ring.size - tail_off_dw).cast(dtypes.int)
-  start_dw = fits * tail_off_dw
-  zero_amt_dw = (1 - fits) * (q.ring.size - tail_off_dw)
-
-  # zero the wrapped tail, then copy the cmdbuf into the ring
-  zi = UOp.range(zero_amt_dw, 0, dtype=dtypes.int, src=(cmdbuf,))
-  zero_tail = ring.index(tail_off_dw + zi).store(UOp.const(0, dtypes.uint32)).end(zi)
-  i = UOp.range(UOp.const(size_dw, dtypes.int), 0, dtype=dtypes.int, src=(cmdbuf,))
-  copy_to_ring = ring.index(start_dw + i).store(cmdbuf.index(i).load()).end(i)
-
-  # advance the put/write pointers past the zeroed tail and the cmdbuf
-  next_put_b = put_b + ((zero_amt_dw + size_dw) * 4).cast(put_b.dtype)
-  bump_put_ptr = put_ptr.index(zero).store(next_put_b)
-  bump_wptr = wptr.index(zero).store(next_put_b)
-
-  # ring the doorbell once the writes have landed
-  flush = UOp.barrier(zero_tail, copy_to_ring, bump_put_ptr, bump_wptr)
-  return doorbell.after(flush).index(zero).store(next_put_b)
-
-pm_sdma_submit = PatternMatcher([(UPat(Ops.LINEAR, name="lin"),
-  lambda ctx, lin: sdma_submit(make_cmdbuf(lin, ctx.devs), ctx.devs))])
-
-@dataclass(frozen=True)
-class AMDEncodeCtx:  # encode-time constants for one queue: devs (every cmdbuf address resolves into these) + gfx version + packet/ip modules
-  devs: tuple[str, ...]; target: tuple[int, ...]; pm4: Any; sdma: Any; soc: Any  # noqa: E702
-  gc: AMDIP; nbio: AMDIP; xccs: int; max_copy_size: int; tmpring_size: Callable  # noqa: E702
-
-def encode_queue(q:UOp) -> UOp|None:
-  d = Device[(devs:=to_tuple(q.arg[0]))[0]]
-  ctx = AMDEncodeCtx(devs, d.target, d.pm4, d.sdma, d.soc, d.gc, d.nbio, d.xccs, d.max_copy_size, d.tmpring_size)
-  opsel, submit = (pm_pm4_opsel, pm_pm4_submit) if q.arg[1].startswith("COMPUTE") else (pm_sdma_opsel, pm_sdma_submit)
-  return submit.rewrite(graph_rewrite(q, opsel + pm_flatten_linear, walk=True, ctx=ctx, name=f"{q.arg[1]} opsel"), ctx)
+    rs, size_dw = q.ring.size, cmdbuf.max_numel() // 4
+    put_b = put.index(0).load()
+    tail = ((put_b % (rs * 4)) // 4).cast(dtypes.int)
+    fits = (size_dw <= rs - tail).cast(dtypes.int)
+    start_dw, zero_amt = fits * tail, (1 - fits) * (rs - tail)
+    zi = UOp.range(zero_amt, 10, dtype=dtypes.int, src=(cmdbuf,))
+    zero_tail = ring.index(tail + zi).store(UOp.const(0, dtypes.uint32)).end(zi)
+    i = UOp.range(size_dw, 11, dtype=dtypes.int, src=(cmdbuf,))
+    copy = ring.index(start_dw + i).store(cmdbuf.bitcast(dtypes.uint32).index(i).load()).end(i)
+    next_put = put_b + ((zero_amt + size_dw) * 4).cast(put_b.dtype)
+    flush = UOp.barrier(zero_tail, copy, put.index(0).store(next_put), wptr.index(0).store(next_put))
+    return doorbell.after(flush).index(0).store(next_put)

@dataclass(frozen=True)
 class AMDProgramData:
@@ -262,33 +228,38 @@ class AMDProgramData:
  private_segment_size:int; kernargs_segment_size:int; kernargs_alloc_size:int
  enable_dispatch_ptr:int; enable_private_segment_sgpr:int

-_amd_program_cache:dict[tuple[bytes,str], tuple[AMDProgramData,bytes]] = {}
-def amd_build_program(prg:UOp) -> UOp:
-  dev = Device[to_tuple(prg.device)[0]] # TODO: rm this
-  if (cached:=_amd_program_cache.get(key:=(lib:=prg.src[3].arg, dev.device))) is None:
-    image, sections, relocs = elf_loader(lib)
-    rodata = next(sh.header.sh_addr for sh in sections if sh.name == ".rodata")
-    for off, sym, typ, addent in relocs:
-      assert typ == 5, f"unknown AMD reloc {typ}"  # R_AMDGPU_REL64
-      image[off:off+8] = struct.pack('<q', sym - off + addent)
-    desc = amdgpu_kd.llvm_amdhsa_kernel_descriptor_t.from_buffer_copy(bytes(image[rodata:rodata+ctypes.sizeof(amdgpu_kd.llvm_amdhsa_kernel_descriptor_t)]))
-    if (lds:=((desc.group_segment_fixed_size+511)//512)&0x1FF) > (dev.iface.props['lds_size_in_kb']*1024)//512:
-      raise RuntimeError("Too many resources requested: group_segment_size")
-    edp = desc.kernel_code_properties & hsa.AMD_KERNEL_CODE_PROPERTIES_ENABLE_SGPR_DISPATCH_PTR
-
-    data = AMDProgramData(entry_point_offset=rodata + desc.kernel_code_entry_byte_offset,
-      rsrc1=desc.compute_pgm_rsrc1 | ((1<<20) if dev.target[0]==11 else 0),  # priv=1 on gfx11 for cwsr
-      rsrc2=desc.compute_pgm_rsrc2 | (lds<<15), rsrc3=desc.compute_pgm_rsrc3,
-      wave32=bool(desc.kernel_code_properties & 0x400), private_segment_size=desc.private_segment_fixed_size, kernargs_segment_size=desc.kernarg_size,
-      kernargs_alloc_size=desc.kernarg_size + (ctypes.sizeof(hsa.hsa_kernel_dispatch_packet_t) if edp else 0), enable_dispatch_ptr=edp,
-      enable_private_segment_sgpr=desc.kernel_code_properties & hsa.AMD_KERNEL_CODE_PROPERTIES_ENABLE_SGPR_PRIVATE_SEGMENT_BUFFER)
-    buf = UOp.placeholder((len(image),), dtypes.uint8, next(UOp.unique_num), device=prg.device).rtag("program")
-    cached = _amd_program_cache[key] = prg.replace(src=(buf.after(make_binary_patch(buf, bytes(image))),), arg=(data, prg.arg))
+_amd_program_cache:dict[tuple[bytes, tuple[str, ...]], tuple[AMDProgramData, UOp]] = {}
+def amd_build_program(dev, prg:UOp, devs:tuple[str, ...]) -> tuple[AMDProgramData, UOp]:
+  # the image parses once per lib, each device set gets its own program buffer of it
+  if (cached:=_amd_program_cache.get(key:=(lib:=prg.src[3].arg, devs))) is None:
+    data, image = _amd_program_image(dev, lib)
+    buf = UOp.placeholder((len(image),), dtypes.uint8, next(UOp.unique_num), device=devs).rtag("program")
+    cached = _amd_program_cache[key] = (data, buf.after(buf.store(UOp(Ops.BINARY, src=(), arg=image).bitcast(buf.dtype))))
  return cached

+@functools.cache
+def _amd_program_image(dev, lib:bytes) -> tuple[AMDProgramData, bytes]:
+  image, sections, relocs = elf_loader(lib)
+  rodata = next(sh.header.sh_addr for sh in sections if sh.name == ".rodata")
+  for off, sym, typ, addent in relocs:
+    assert typ == 5, f"unknown AMD reloc {typ}"  # R_AMDGPU_REL64
+    image[off:off+8] = struct.pack('<q', sym - off + addent)
+  desc = amdgpu_kd.llvm_amdhsa_kernel_descriptor_t.from_buffer_copy(bytes(image[rodata:rodata+ctypes.sizeof(amdgpu_kd.llvm_amdhsa_kernel_descriptor_t)]))
+  if (lds:=((desc.group_segment_fixed_size+511)//512)&0x1FF) > (dev.iface.props['lds_size_in_kb']*1024)//512:
+    raise RuntimeError("Too many resources requested: group_segment_size")
+  edp = desc.kernel_code_properties & hsa.AMD_KERNEL_CODE_PROPERTIES_ENABLE_SGPR_DISPATCH_PTR
+
+  data = AMDProgramData(entry_point_offset=rodata + desc.kernel_code_entry_byte_offset,
+    rsrc1=desc.compute_pgm_rsrc1 | ((1<<20) if dev.target[0]==11 else 0),  # priv=1 on gfx11 for cwsr
+    rsrc2=desc.compute_pgm_rsrc2 | (lds<<15), rsrc3=desc.compute_pgm_rsrc3,
+    wave32=bool(desc.kernel_code_properties & 0x400), private_segment_size=desc.private_segment_fixed_size, kernargs_segment_size=desc.kernarg_size,
+    kernargs_alloc_size=desc.kernarg_size + (ctypes.sizeof(hsa.hsa_kernel_dispatch_packet_t) if edp else 0), enable_dispatch_ptr=edp,
+    enable_private_segment_sgpr=desc.kernel_code_properties & hsa.AMD_KERNEL_CODE_PROPERTIES_ENABLE_SGPR_PRIVATE_SEGMENT_BUFFER)
+  return data, bytes(image).ljust(round_up(len(image), 4), b"\x00") # the program is uploaded as whole dwords
+
 class AMDAllocator(HCQAllocator['AMDDevice']):
  def __init__(self, dev:AMDDevice):
-    super().__init__(dev, supports_copy_from_disk=dev.has_copy_queue, supports_transfer=dev.has_copy_queue and not dev.is_usb())
+    super().__init__(dev, supports_copy_from_disk=dev.has_copy_queue, supports_transfer=dev.has_copy_queue and not dev.is_usb)

  def _alloc(self, size:int, options:BufferSpec) -> HCQBuffer:
    return self.dev.iface.alloc(size, host=options.host, uncached=options.uncached, cpu_access=options.cpu_access or not self.dev.has_copy_queue)
@@ -524,8 +495,7 @@ class PCIIface(PCIIfaceBase):
      cq = d.compute_queue
      for b in (cq.put_value, cq.read_ptr, cq.write_ptr): b._buf.view.view(fmt='Q')[0] = 0
      d.iface.dev_impl.gfx.setup_ring(*cq.params)
-      d.signal('timeline')._buf.cpu_view().mv.cast('Q')[0] = \
-        d.signal('value', 1).as_memoryview(force_zero_copy=True, no_sync=True).cast('Q')[0] - 1
+      (tl:=d.timeline._buf.cpu_view().view(fmt='Q'))[0] = tl[1]

  def sleep(self, timeout):
    if hasattr(self.pci_dev, 'irq_poller') and self.pci_dev.irq_poller is not None and (events_cnt:=len(self.pci_dev.irq_poller.poll(timeout))):
@@ -539,31 +509,52 @@ class PCIIface(PCIIfaceBase):

  def device_fini(self): self.dev_impl.fini()

+class USBIface(PCIIface):
+  def __init__(self, dev, dev_id): # pylint: disable=super-init-not-called
+    if dev_id >= len(visible:=hcq_filter_visible_devices(USB3.list_devices(0xADD1, 0x0001) + USB3.list_devices(0x3801, 0x0001), "AMD")):
+      raise RuntimeError(f"AMD:{dev_id} does not exist ({pluralize('device', len(visible))} available)")
+    self.dev, self.pci_dev, self.vram_bar, self.count = dev, USBPCIDevice("AM", *visible[dev_id]), 0, len(visible)
+    self.dev_impl = AMDev(self.pci_dev)
+    self._compute_props()
+    self.sram = self._dma_region(ctrl_addr=0xf000, sys_addr=0x200000, size=0x80000)
+    self.cq_buf = self._dma_region(ctrl_addr=0xb800, sys_addr=0x822000, size=0x1000) # +12 is the dword that releases an armed read
+    self.usb_handle = unwrap(ctypes.cast(self.pci_dev.usb.usb.handle, ctypes.c_void_p).value)
+
+  def _dma_region(self, ctrl_addr, sys_addr, size):
+    region = self.dev_impl.mm.map_range(vaddr:=self.dev_impl.mm.alloc_vaddr(size=size), size, [(sys_addr, size)], aspace=AddrSpace.SYS, uncached=True)
+    return HCQBuffer(vaddr, size, meta=PCIAllocationMeta(region, has_cpu_mapping=False), view=self.pci_dev.dma_view(ctrl_addr, size), owner=self.dev)
+
+  def alloc(self, size:int, host=False, uncached=False, cpu_access=False, contiguous=False, force_devmem=False, **kwargs) -> HCQBuffer:
+    # everything, even host-style signals, lives in vram: gpu writes into the bridge's own memory collide with an armed 0xF2 read stream
+    return super().alloc(size, host=False, uncached=uncached, cpu_access=cpu_access or host, contiguous=contiguous, force_devmem=True, **kwargs)
+
+  def sleep(self, timeout): pass
+
+  # we don't own the sram region, so the buffer never frees it
+  @functools.cached_property
+  def usb_sram(self) -> Buffer:
+    return Buffer(self.dev.device, (b:=self.sram).size, dtypes.uint8, options=BufferSpec(external_ptr=b.va_addr, nolru=True)).allocate(opaque=b)
+
 def _mock(iface, name=None): return type(name or f"MOCK{iface.__name__}", (iface,), {})

 class AMDDevice(HCQ2Compiled):
-  pm_lower = PatternMatcher([
-    # prep program
-    (UPat(Ops.PROGRAM, src=(UPat(), UPat(), UPat(), UPat(Ops.BINARY)), name="prg"), amd_build_program),
-
-    # encoding of cmdbuf
-    (UPat(Ops.CUSTOM_FUNCTION, arg="submit_cmdbuf", src=(UPat(Ops.LINEAR, name="q"),)), encode_queue),
-  ])
-
  timestamp_divider = 100.0  # AMD GPU clock: ticks/us
  max_scratch_psize = 0
+  pm_encode = PatternMatcher([
+    (UPat(Ops.CUSTOM_FUNCTION, arg="submit_amd_compute", name="submit"), lambda ctx, submit: encode_submit(AMDComputeQueue(ctx, submit))),
+    (UPat(Ops.CUSTOM_FUNCTION, arg="submit_amd_copy", name="submit"), lambda ctx, submit: encode_submit(AMDSDMAQueue(ctx, submit))),
+  ])

-  ifaces = [KFDIface, PCIIface, _mock(KFDIface, "MOCKIface"), _mock(KFDIface), _mock(PCIIface)]
+  ifaces = [KFDIface, PCIIface, USBIface, _mock(KFDIface, "MOCKIface"), _mock(KFDIface), _mock(PCIIface), _mock(USBIface)]

  def device_props(self): return self.iface.props

  def is_am(self) -> bool: return isinstance(self.iface, (PCIIface,))
-  def is_usb(self) -> bool: return False

  def __init__(self, device:str=""):
-    self.device_id = int(device.split(":")[1]) if ":" in device else 0
-
-    self.iface = self._select_iface()
+    self.iface = self._select_iface(device)
+    self.is_usb = isinstance(self.iface, USBIface)
+    if self.is_usb: self.rt_nbytes = 4 << 20

    self.target:tuple[int, ...] = ((trgt:=self.iface.props['gfx_target_version']) // 10000, (trgt // 100) % 100, trgt % 100)
    self.arch = "gfx%d%x%x" % self.target
@@ -588,7 +579,7 @@ class AMDDevice(HCQ2Compiled):

    self.is_aql = getenv("AMD_AQL", int(self.xccs > 1))
    if self.is_aql:
-      self.pm4_ibs = self.iface.alloc(0x2000 if self.is_usb() else (16 << 20), uncached=True, cpu_access=True)
+      self.pm4_ibs = self.iface.alloc(0x2000 if self.is_usb else (16 << 20), uncached=True, cpu_access=True)
      self.pm4_ib_alloc = BumpAllocator(self.pm4_ibs.size, wrap=True)

    self.max_copy_size = 0x40000000 if self.iface.ip_versions[am.SDMA0_HWIP][0] >= 5 else 0x400000
@@ -599,7 +590,11 @@ class AMDDevice(HCQ2Compiled):

    # Scratch setup
    self.max_private_segment_size = 0
-    self.pm_bufferize = PatternMatcher([(UPat(Ops.PARAM, tag="scratch", name="b"), lambda ctx, b: ctx[0].scratch_buffer(b.max_numel()))]) + self.pm_bufferize
+    self.pm_bufferize = PatternMatcher([(UPat(Ops.PARAM, tag="scratch", name="b"), lambda ctx, b: ctx.scratch_buffer(b.max_numel()))]) + self.pm_bufferize
+
+    if self.is_usb:
+      self.pm_bufferize = pm_usb_bufferize + self.pm_bufferize
+      raise NotImplementedError("usb amd is not migrated to sealed submits yet") # a usb pm_lower can override the whole submit graph

    self.pmc_enabled:bool = PROFILE > 0 and PMC > 0
    if self.pmc_enabled:
@@ -647,7 +642,7 @@ class AMDDevice(HCQ2Compiled):

    qname = f"{'COPY' if queue_type == kfd.KFD_IOC_QUEUE_TYPE_SDMA else 'COMPUTE'}:{idx}"
    self.pm_bufferize = PatternMatcher([
-      (UPat(Ops.PARAM, tag=f"{qname}_{name}"), lambda ctx, b=getattr(queue, name): b) for name in ["ring", "write_ptr", "doorbell", "put_value"]
+      (UPat(Ops.PARAM, tag=to_name(name, qname)), lambda ctx, b=getattr(queue, name): b) for name in ["ring", "write_ptr", "doorbell", "put_value"]
    ]) + self.pm_bufferize

    return queue
@@ -661,7 +656,7 @@ class AMDDevice(HCQ2Compiled):
    wg_data_size = round_up((vgpr_size_per_cu + sgrp_size_per_cu + lds_size_per_cu + hwreg_size_per_cu) * self.cu_cnt, mmap.PAGESIZE)
    ctl_stack_size = round_up((12 if self.target[0] != 9 else 8) * self.wave_cnt + 8 + 40, mmap.PAGESIZE)
    return self.create_queue(kfd.KFD_IOC_QUEUE_TYPE_COMPUTE_AQL if self.is_aql else kfd.KFD_IOC_QUEUE_TYPE_COMPUTE,
-      0x2000 if self.is_usb() else (16 << 20), eop_buffer_size=0x1000,
+      0x2000 if self.is_usb else (16 << 20), eop_buffer_size=0x1000,
      ctx_save_restore_size=0 if self.is_am() else wg_data_size + ctl_stack_size, ctl_stack_size=ctl_stack_size,
      debug_memory_size=round_up(self.wave_cnt * 32, 64))

@@ -669,7 +664,7 @@ class AMDDevice(HCQ2Compiled):
    if getenv("AMD_DISABLE_SDMA"): return None
    if idx in self.sdma_queues: return self.sdma_queues[idx]
    with contextlib.suppress(OSError):
-      self.sdma_queues[idx] = self.create_queue(kfd.KFD_IOC_QUEUE_TYPE_SDMA, 0x200 if self.is_usb() else (16 << 20), idx=idx)
+      self.sdma_queues[idx] = self.create_queue(kfd.KFD_IOC_QUEUE_TYPE_SDMA, 0x2000 if self.is_usb else (16 << 20), idx=idx)
    return self.sdma_queues.get(idx, None)

  def tmpring_size(self, private_segment_size):
@@ -1,8 +1,6 @@
 from __future__ import annotations
 import functools, pathlib
-from dataclasses import replace
-from tinygrad import Tensor, dtypes
-from tinygrad.uop.ops import shape_to_shape_arg
+from tinygrad import Tensor
 from tinygrad.runtime.support.compiler_amd import HIPCCCompiler

 FP8_MAX = 448.0
@@ -12,13 +10,13 @@ NUM_WG, THREADS_PER_WG = 1024, 256
@functools.cache
 def _local_abs_max_fxn(x_p, device):
  x = Tensor(x_p, device=device)
-  inner = Tensor(x.uop.replace(src=(shape_to_shape_arg(x.uop.shard_shape),), arg=replace(x.uop.arg, axis=None))) if x.uop.axis is not None else x
+  inner = Tensor(x.uop.src[0]) if x.uop.axis is not None else x  # the per-shard view of the flat param
  return (inner.abs().max(),)

 def local_abs_max(x:Tensor) -> Tensor:
  param = x.as_param(0)
  fxn = _local_abs_max_fxn(param.uop, x.device)
-  return Tensor(fxn[0].uop.call(x.uop).gettuple(0))
+  return Tensor(fxn[0].uop.call_with_output(x.uop))

 def shard_shape(shape:tuple, axis:int, ndev:int) -> list:
  s = list(shape)
@@ -50,7 +50,7 @@ def _custom_quantize_fp8_with_amax(fp8_out:UOp, amax_out:UOp, x:UOp, amax_state:
  else: raise NotImplementedError(f"no atomic max for device {device}")
  amax_idx = amax_out.reshape((1,)).index(UOp.const(0))
  max_val = lds[0].load()
-  atomic = UOp(Ops.CUSTOM, dtypes.void, (amax_idx, max_val.bitcast(dtypes.int32), max_val, amax_idx.load()), arg=atomic_arg)
+  atomic = UOp(Ops.CUSTOM, src=(amax_idx, max_val.bitcast(dtypes.int32), max_val, amax_idx.load()), arg=(atomic_arg, dtypes.void))
  return atomic.end(tid, wg).sink(arg=KernelInfo(f"quantize_fp8_with_amax_{n_elems}", opts_to_apply=()))

@functools.cache
@@ -12,7 +12,7 @@ def _custom_quantize_mxfp4(row_fp4:UOp, row_scale:UOp, col_fp4:UOp, col_scale:UO
  mem = M*N*2 + M*N + M*N//16  # read bf16, write row+col fp4 + e8m0
  outputs = (row_fp4, row_scale, col_fp4, col_scale)
  sink = UOp.sink(*(o.base for o in outputs), x.base,
-                  *(UOp(Ops.CUSTOM, dtypes.void, (o.base.index(0),), arg="") for o in outputs),
+                  *(UOp(Ops.CUSTOM, src=(o.base.index(0),), arg=("", dtypes.void)) for o in outputs),
                  UOp.special(256, "lidx0"), UOp.special(M//128, "gidx0"), UOp.special(N//64, "gidx1"),
                  arg=KernelInfo(name, estimates=Estimates(ops=12*M*N, mem=mem)))
  src = (pathlib.Path(__file__).parent/"quantize_mxfp4.cpp").read_text()
@@ -13,12 +13,13 @@ def _rmsnorm_fwd_fxn(x_in_p, eps, device):
  return rmsnorm_fwd(Tensor(x_in_p, device=device), eps)

 def _rmsnorm_bwd(grad:UOp, call:UOp) -> tuple:
-  x_normed = Tensor(call.gettuple(0)).float()
+  outs = call.unbound_outputs
+  x_normed = Tensor(outs[0]).float()
  do_float = Tensor(grad).float()
-  d_x = Tensor(call.gettuple(1)) * (do_float - x_normed * (do_float * x_normed).mean(-1, keepdim=True))
+  d_x = Tensor(outs[1]) * (do_float - x_normed * (do_float * x_normed).mean(-1, keepdim=True))
  return (d_x.cast(call.src[1].dtype).uop,)

 def rmsnorm(x_in:Tensor, eps:float) -> tuple[Tensor, Tensor]:
  fxn = _rmsnorm_fwd_fxn(x_in.as_param(0).uop, eps, x_in.device)
-  call = UOp.maketuple(fxn[0].uop, fxn[1].uop).call(x_in.uop, grad_fxn=_rmsnorm_bwd)
-  return Tensor(call.gettuple(0)), Tensor(call.gettuple(1))
+  outs = UOp.call_with_outputs((fxn[0].uop, fxn[1].uop), x_in.uop, grad_fxn=_rmsnorm_bwd)
+  return Tensor(outs[0]), Tensor(outs[1])
@@ -3,7 +3,7 @@ import os
 # TODO: there is a timing bug without this
 os.environ["AMD_AQL"] = "1"

-from tinygrad import Tensor, Device, GlobalCounters, Context
+from tinygrad import Tensor, Device, GlobalCounters, Context, dtypes
 from tinygrad.helpers import getenv, DEV
 from tinygrad.uop.ops import UOp, Ops, KernelInfo
 from tinygrad.renderer import Estimates
@@ -37,7 +37,7 @@ def launchBenchmark(instruction, vgprIndices, dense=True, accum=False, **kwargs)
    gidx = UOp.special(NUM_WORKGROUPS, "gidx0")
    FLOPs = FLOPS_PER_MATMUL * NUM_WAVES * NUM_WORKGROUPS * INTERNAL_LOOP * INSTRUCTIONS_PER_LOOP
    sink = UOp.sink(A.base, threads, gidx, arg=KernelInfo(inst.op.name.lower(), estimates=Estimates(ops=FLOPs, mem=0)))
-    return UOp(Ops.PROGRAM, src=(sink, UOp(Ops.LINEAR, src=tuple([UOp(Ops.INS, arg=x) for x in insts]))))
+    return UOp(Ops.PROGRAM, src=(sink, UOp(Ops.LINEAR, src=tuple([UOp(Ops.INS, arg=(x, dtypes.void)) for x in insts]))))
  dummy = Tensor.zeros(1).contiguous().realize()
  out = Tensor.custom_kernel(dummy, fxn=fxn)[0]
  linear = out.schedule_linear()
@@ -5,9 +5,9 @@ from tinygrad.helpers import getenv, DEBUG

 # https://github.com/facebookresearch/llama/blob/1076b9c51c77ad06e9d7ba8a4c6df775741732bd/llama/model.py#L47
 def precompute_freqs_cis(dim: int, end: int, theta: float = 10000.0) -> Tensor:
-  freqs = 1.0 / (theta ** (Tensor.arange(0, dim, 2)[:(dim // 2)] / dim))
-  freqs = Tensor.arange(end).unsqueeze(dim=1) * freqs.unsqueeze(dim=0)
-  return Tensor.stack(freqs.cos(), freqs.sin(), dim=-1).reshape(1, end, 1, dim//2, 2)
+  freqs = 1.0 / (theta ** (Tensor.arange(0, dim, 2, dtype=dtypes.float32)[:(dim // 2)] / dim))
+  freqs = Tensor.arange(end, dtype=dtypes.float32).unsqueeze(dim=1) * freqs.unsqueeze(dim=0)
+  return Tensor.stack(freqs.cos(), freqs.sin(), dim=-1).cast(dtypes.default_float).reshape(1, end, 1, dim//2, 2)

 # matches meta, non hugging face weights
 # (a+i*b) * (c+i*d) = (ac-bd) + i*(ad+bc)
@@ -139,7 +139,7 @@ class TransformerBlock:

  def __call__(self, x:Tensor, start_pos:Union[Variable,int], freqs_cis:Tensor, mask:Optional[Tensor]):
    h = x + self.attention(self.attention_norm(x), start_pos, freqs_cis, mask)
-    return (h + self.feed_forward(self.ffn_norm(h))).contiguous().contiguous_backward()
+    return (h + self.feed_forward(self.ffn_norm(h))).clone().contiguous_backward()

 # standard openai sampling
 def sample(logits: Tensor, temp: float, k: int, p: float, af: float, ap: float):
@@ -201,7 +201,7 @@ class Transformer:
    self.tok_embeddings = embedding(vocab_size, dim)
    self.output = nn.Linear(dim, vocab_size, bias=False) if embedding == nn.Embedding else linear(dim, vocab_size, bias=False)
    self.max_context = max_context
-    self.freqs_cis = precompute_freqs_cis(dim // n_heads, self.max_context * 2, rope_theta).contiguous().is_param_(False)
+    self.freqs_cis = precompute_freqs_cis(dim // n_heads, self.max_context * 2, rope_theta).clone().is_param_(False)
    self.forward_jit = TinyJit(self.forward) if jit else None

  def forward(self, tokens:Tensor, start_pos:Union[Variable,int], temperature:float, top_k:int, top_p:float, alpha_f:float, alpha_p:float):
@@ -1,10 +1,12 @@
 from tinygrad import Tensor
+import os
 from tinygrad.tensor import _to_np_dtype
 from tinygrad.nn.onnx import OnnxRunner, OnnxValue
 import numpy as np
 import onnxruntime as ort
 ort_options = ort.SessionOptions()
 ort_options.log_severity_level = 3
+ort_options.intra_op_num_threads = os.cpu_count() or 1

 def get_example_inputs(graph_inputs:dict[str, OnnxValue], config={}):
  """
@@ -89,7 +89,8 @@ class TestBeamSearch(unittest.TestCase):
    s.apply_opt(Opt(OptOps.TC, 0, (-1, 0, 1)))
    up = prod([x for x, t in zip(s.full_shape, s.axis_types) if t in (AxisType.UPCAST, AxisType.UNROLL)])
    actions = get_kernel_actions(s, include_0=False, max_up=int(up))
-    upcasted = [s for s in actions.values() if any(opt.op in (OptOps.UPCAST, OptOps.UNROLL) for opt in s.applied_opts)]
+    upcasted = [s for s in actions.values() if any(o.op is OptOps.SPLIT and o.arg[1] in (AxisType.UPCAST, AxisType.UNROLL)
+                                                  for o in s.applied_opts)]
    assert len(upcasted) > 0, f"expected upcast/unroll actions after TC with max_up={up}, but got none"

  def test_max_up(self):
@@ -98,8 +99,8 @@ class TestBeamSearch(unittest.TestCase):
    s = Scheduler(ast, Device[Device.DEFAULT].renderer)
    for max_up in (2, 4):
      actions = get_kernel_actions(s, include_0=False, max_up=max_up)
-      for up_opts in [s.applied_opts for s in actions.values() if any(opt.op in (OptOps.UPCAST, OptOps.UNROLL) for opt in s.applied_opts)]:
-        assert len([opt for opt in up_opts if opt.arg > max_up]) == 0 and len([op for op in up_opts if op.arg <= max_up]) > 0
+      up_opts = [o for s in actions.values() for o in s.applied_opts if o.op is OptOps.SPLIT and o.arg[1] in (AxisType.UPCAST, AxisType.UNROLL)]
+      assert len([opt for opt in up_opts if opt.arg[0] > max_up]) == 0 and len([op for op in up_opts if op.arg[0] <= max_up]) > 0

 if __name__ == '__main__':
  unittest.main()
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 import os, sys, time
-from tinygrad.runtime.support.system import RemotePCIDevice
+from extra.remote.hcq1_remote import RemotePCIDevice

 LAT_N_RUNS = 500
 THROUGHPUT_N_RUNS = 8
@@ -18,7 +18,7 @@ if __name__ == "__main__":
  print(f"connected to {os.environ['REMOTE']}, device: {name}\n")

  # ping (minimal server round-trip, no device I/O)
-  from tinygrad.runtime.support.system import RemoteCmd
+  from extra.remote.hcq1_remote import RemoteCmd
  sock = pci.sock
  for _ in range(10): RemotePCIDevice._rpc(sock, 0, RemoteCmd.PING)
  st = time.perf_counter()
@@ -0,0 +1,143 @@
+from __future__ import annotations
+import os, mmap, array, functools, contextlib, itertools, struct, socket, subprocess, time, enum, atexit
+from tinygrad.helpers import getenv, temp, ceildiv, unwrap, fetch, system, _ensure_downloads_dir, DEBUG, flatten
+from tinygrad.runtime.support.hcq import FileIOInterface, MMIOInterface
+from tinygrad.runtime.support.system import PCIDevice, System
+
+class RemoteCmd(enum.IntEnum):
+  PROBE,MAP_BAR,MAP_SYSMEM_FD,CFG_READ,CFG_WRITE,RESET,MMIO_READ,MMIO_WRITE,MAP_SYSMEM,SYSMEM_READ,SYSMEM_WRITE,RESIZE_BAR,PING = range(13)
+
+class RemoteMMIOInterface(MMIOInterface):
+  def __init__(self, dev:RemotePCIDevice, residx:int, nbytes:int, fmt='B', off=0, rd_cmd=RemoteCmd.MMIO_READ, wr_cmd=RemoteCmd.MMIO_WRITE):
+    self.dev, self.residx, self.nbytes, self.fmt, self.off, self.el_sz = dev, residx, nbytes, fmt, off, struct.calcsize(fmt)
+    self.rd_cmd, self.wr_cmd = rd_cmd, wr_cmd
+
+  def __getitem__(self, index):
+    sl = index if isinstance(index, slice) else slice(index, index + 1)
+    start, stop = (sl.start or 0) * self.el_sz, (sl.stop or len(self)) * self.el_sz
+    data = self.dev._bulk_read(self.rd_cmd, self.residx, self.off + start, stop - start)
+    result = data if self.fmt == 'B' else list(struct.unpack(f'<{(stop - start) // self.el_sz}{self.fmt}', data))
+    return result if isinstance(index, slice) else result[0]
+
+  def __setitem__(self, index, val):
+    start = (index.start or 0) * self.el_sz if isinstance(index, slice) else index * self.el_sz
+    data = (val if self.fmt == 'B' else struct.pack(f'<{len(val)}{self.fmt}', *val)) if isinstance(index, slice) else struct.pack(f'<{self.fmt}', val)
+    self.dev._bulk_write(self.wr_cmd, self.residx, self.off + start, data)
+
+  def view(self, offset:int=0, size:int|None=None, fmt=None):
+    return RemoteMMIOInterface(self.dev, self.residx, size or (self.nbytes - offset), fmt or self.fmt, self.off + offset, self.rd_cmd, self.wr_cmd)
+
+class RemotePCIDevice(PCIDevice):
+  _bulk_sent:int = 0
+  _bulk_recv:int = 0
+  _rpc_count:int = 0
+  _start_time:float = 0.0
+
+  @staticmethod
+  @functools.cache
+  def remote_sock(host:str, port:int) -> socket.socket:
+    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
+    sock.settimeout(getenv("REMOTE_TIMEOUT", 3))
+    sock.connect((host, port))
+    sock.settimeout(None)
+    if DEBUG >= 1 and RemotePCIDevice._start_time == 0.0:
+      RemotePCIDevice._start_time = time.perf_counter()
+      def _print_stats():
+        dt = time.perf_counter() - RemotePCIDevice._start_time
+        sent_mb, recv_mb = RemotePCIDevice._bulk_sent / 1e6, RemotePCIDevice._bulk_recv / 1e6
+        print(f"remote: sent {sent_mb:,.2f} MB ({sent_mb/dt:,.2f} MB/s), recv {recv_mb:,.2f} MB ({recv_mb/dt:,.2f} MB/s), "
+              f"{RemotePCIDevice._rpc_count:,} roundtrips in {dt:.2f}s")
+      atexit.register(_print_stats)
+    return sock
+
+  @staticmethod
+  @functools.cache
+  def remote_list(vendor:int, devices:tuple[tuple[int, tuple[int, ...]], ...], base_class:int|None) -> list[tuple[socket.socket, str]]:
+    payload = array.array('I', itertools.chain.from_iterable((m, d) for m, ds in devices for d in ds)).tobytes()
+    def q(r:str) -> list[tuple[socket.socket, str]]:
+      sock = RemotePCIDevice.remote_sock((host:=r.strip().split(":")[0]), (port:=int(r.strip().split(":")[1]) if ":" in r else 6667))
+      data_len, _, _, _ = RemotePCIDevice._rpc(sock, 0, RemoteCmd.PROBE, base_class or 0, len(payload), vendor, payload=payload)
+      return [(sock, f"remote:{host}:{port}:{d}") for d in RemotePCIDevice._recvall(sock, data_len).decode().split('\n')]
+    return flatten([q(r) for r in getenv("REMOTE", "").split(",") if r.strip()])
+
+  @staticmethod
+  def _recvall(sock:socket.socket, n:int) -> bytes:
+    data = b''
+    while len(data) < n and (chunk:=sock.recv(n - len(data))): data += chunk
+    if len(data) < n: raise RuntimeError("Connection closed")
+    return data
+
+  @staticmethod
+  def _rpc(sock:socket.socket, dev_id:int, cmd:int, *args:int, bar:int=0, readout_size:int=0, payload:bytes=b'', has_fd=False):
+    sock.sendall(struct.pack('<BIIQQQ', cmd, dev_id, bar, *(*args, 0, 0, 0)[:3]) + payload)
+    if has_fd:
+      msg, anc, _, _ = sock.recvmsg(17, socket.CMSG_LEN(4))
+      fd = struct.unpack('<i', anc[0][2][:4])[0]
+    else: msg, fd = RemotePCIDevice._recvall(sock, 17), None
+    if (resp:=struct.unpack('<BQQ', msg))[0] != 0:
+      raise RuntimeError(f"RPC failed: {RemotePCIDevice._recvall(sock, resp[1]).decode('utf-8') if resp[1] > 0 else 'unknown error'}")
+    RemotePCIDevice._rpc_count += 1
+    return (resp[1], resp[2]) + ((RemotePCIDevice._recvall(sock, readout_size) if readout_size > 0 else None),) + (fd,)
+
+  def __init__(self, devpref:str, pcibus:str, sock:socket.socket):
+    self.sock, self.pcibus, self.dev_id = sock, pcibus, int(pcibus.split(':')[-1]) if ':' in pcibus else 0
+    self.peer_group = sock.getpeername()[0]
+    for buft in [socket.SO_SNDBUF, socket.SO_RCVBUF]: self.sock.setsockopt(socket.SOL_SOCKET, buft, 64 << 20)
+
+    self.lock_fd = System.flock_acquire(f"{devpref.lower()}_{pcibus.lower()}.lock")
+
+  def _bulk_read(self, cmd:int, idx:int, offset:int, size:int) -> bytes:
+    RemotePCIDevice._bulk_recv += size
+    return unwrap(self._rpc(self.sock, self.dev_id, cmd, offset, size, bar=idx, readout_size=size)[2])
+  def _bulk_write(self, cmd:int, idx:int, offset:int, data:bytes):
+    RemotePCIDevice._bulk_sent += len(data)
+    self.sock.sendall(struct.pack('<BIIQQQ', cmd, self.dev_id, idx, offset, len(data), 0) + data)
+
+  def alloc_sysmem(self, size:int, vaddr:int=0, contiguous:bool=False) -> tuple[MMIOInterface, list[int]]:
+    paddrs_len, handle, _, _ = self._rpc(self.sock, self.dev_id, RemoteCmd.MAP_SYSMEM, size, int(contiguous))
+    paddrs = list(struct.unpack(f'<{paddrs_len // 8}Q', self._recvall(self.sock, paddrs_len)))
+    return RemoteMMIOInterface(self, handle, size, fmt='B', rd_cmd=RemoteCmd.SYSMEM_READ, wr_cmd=RemoteCmd.SYSMEM_WRITE), paddrs
+
+  def reset(self): self._rpc(self.sock, self.dev_id, RemoteCmd.RESET)
+  def read_config(self, offset:int, size:int): return self._rpc(self.sock, self.dev_id, RemoteCmd.CFG_READ, offset, size)[0]
+  def write_config(self, offset:int, value:int, size:int): self._rpc(self.sock, self.dev_id, RemoteCmd.CFG_WRITE, offset, size, value)
+
+  @functools.cache
+  def bar_info(self, bar_idx:int) -> tuple[int, int]: return self._rpc(self.sock, self.dev_id, RemoteCmd.MAP_BAR, bar=bar_idx)[:2]
+  def map_bar(self, bar:int, off:int=0, addr:int=0, size:int|None=None, fmt='B') -> MMIOInterface:
+    return RemoteMMIOInterface(self, bar, size or self.bar_info(bar)[1], fmt).view(off, size, fmt)
+  def resize_bar(self, bar_idx:int): self._rpc(self.sock, self.dev_id, RemoteCmd.RESIZE_BAR, bar=bar_idx)
+
+class APLRemotePCIDevice(RemotePCIDevice):
+  APP_PATH = "/Applications/TinyGPU.app/Contents/MacOS/TinyGPU"
+
+  @classmethod
+  def ensure_app(cls):
+    commit = "c0d024f9ff0e1dc8fdf217f255da7101d91e8323"
+    app_name = f"TinyGPU_{commit}.zip"
+    if (_ensure_downloads_dir() / app_name).is_file() and os.path.exists(cls.APP_PATH): return
+    print("Downloading TinyGPU.app...")
+    with contextlib.suppress(RuntimeError): system("pkill -f TinyGPU")
+    system(f"ditto -xk {fetch(f'https://github.com/tinygrad/tinygpu_releases/raw/{commit}/TinyGPU.zip', name=app_name)} /Applications")
+    print(system(f"{cls.APP_PATH} install"))
+
+  def __init__(self, devpref:str, pcibus:str):
+    self.ensure_app()
+    sock_path, sock = getenv("APL_REMOTE_SOCK", temp("tinygpu.sock")), socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+    for i in range(100):
+      with contextlib.suppress(ConnectionRefusedError, FileNotFoundError):
+        sock.connect(sock_path)
+        break
+      if i == 0: subprocess.Popen([self.APP_PATH, "server", sock_path], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+      time.sleep(0.05)
+    else: raise RuntimeError(f"Failed to connect to TinyGPU server at {sock_path}.")
+    super().__init__(devpref, "usb4", sock=sock)
+
+  def alloc_sysmem(self, size:int, vaddr:int=0, contiguous:bool=False) -> tuple[MMIOInterface, list[int]]:
+    mapped_size, _, _, fd = self._rpc(self.sock, self.dev_id, RemoteCmd.MAP_SYSMEM_FD, size, int(contiguous), has_fd=True)
+    memview = MMIOInterface(FileIOInterface(fd=fd).mmap(0, mapped_size, mmap.PROT_READ | mmap.PROT_WRITE, mmap.MAP_SHARED, 0), mapped_size, fmt='B')
+
+    # paddrs are returned as (paddr, size) pairs until a (paddr=0, size=0) terminator in the beginning of the mapping.
+    paddrs_raw = list(itertools.takewhile(lambda p: p[1] != 0, zip(memview.view(fmt='Q')[0::2], memview.view(fmt='Q')[1::2])))
+    return memview, [p + i for p, sz in paddrs_raw for i in range(0, sz, 0x1000)][:ceildiv(size, 0x1000)]
@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 import socket, struct, sys
-from tinygrad.runtime.support.system import PCIDevice, RemoteCmd, System
+from tinygrad.runtime.support.system import PCIDevice, System
+from extra.remote.hcq1_remote import RemoteCmd
 from tinygrad.helpers import DEBUG, OSX

 def resp(resp0=0, resp1=0, status=0): return struct.pack('<BQQ', status, resp0, resp1)
@@ -49,13 +49,13 @@ ldconfig
 curl -sL https://raw.githubusercontent.com/geohot/configuration/master/.tmux.conf -o ~/.tmux.conf
 ```

-### 1.6 Reload amdgpu driver
-tinygrad's HCQ backend needs `/dev/kfd` which is created by the amdgpu kernel driver.
-If the driver was unloaded, reload it:
+### 1.6 Verify GPU PCI access
+The AM userspace driver accesses the GPUs directly over PCI. Do not load `amdgpu`. `/dev/kfd` is not required.
 ```bash
-modprobe amdgpu
-ls /dev/kfd  # should exist
+rmmod amdgpu
+lspci -nnk -d 1002:
 ```
+The MI350X devices should not show a `Kernel driver in use: amdgpu`.

 ## Phase 2: Clone tinygrad
 ```bash
@@ -76,8 +76,23 @@ rclone config create mlc-training s3 provider=Cloudflare \
  endpoint=c2686074cb2caf5cbaf6d134bdba8b47.r2.cloudflarestorage.com

 mkdir -p /raid/datasets/c4-8b
-rclone copy mlc-training:mlcommons-training-wg-public/llama3_1/datasets/c4/llama3_1_8b/ /raid/datasets/c4-8b/ -P
+(rclone copy mlc-training:mlcommons-training-wg-public/llama3_1/datasets/c4/llama3_1_8b/ /raid/datasets/c4-8b/ -P && \
+  PYTHONPATH=. python3 examples/mlperf/training_submission_v6.0/tinycorp/benchmarks/llama31_8b/implementations/tinybox_8xMI350X/buid_dataset_cache.py) \
+  > /root/dataset_cache.log 2>&1 &
 ```
+Leave this running and proceed to the beam step while the dataset downloads and its cache builds.
+
+### 3.1 Smoke test (beam search, 2 layers, fake data)
+Always run beam first to validate the pipeline:
+```bash
+tmux new-session -d -s beam 'cd /root/tinygrad && COMGR_PATH=/opt/rocm/lib/libamd_comgr.so COMGR_3_PATH=/opt/rocm/lib/libamd_comgr.so CC=/opt/rocm/core-7.14/lib/llvm/bin/clang DEV=PCI+AMD:HIP ROCM_PATH=/opt/rocm bash examples/mlperf/training_submission_v6.0/tinycorp/benchmarks/llama31_8b/implementations/tinybox_8xMI350X/dev_beam.sh 2>&1 | tee /root/beam.log'
+```
+
+The beam test runs 10 training steps with 2 layers. Expected results:
+- ~0.29s per step after warmup
+- ~700K GFLOPS, ~7% MFU (low because only 2 layers)
+- ~380 GB VRAM used
+- Loss stable at ~12.55 with random init

 Files downloaded (~85GB total, ~6 minutes):
 - `c4-train.en_6_text_document.bin` (79 GB)
@@ -106,25 +121,13 @@ wandb login <API_KEY>

 Run training in tmux so it survives SSH disconnects:
 ```bash
-tmux new-session -d -s train 'cd /root/tinygrad && COMGR_PATH=/opt/rocm/lib/libamd_comgr.so COMGR_3_PATH=/opt/rocm/lib/libamd_comgr.so CC=/opt/rocm/core-7.14/lib/llvm/bin/clang DEV=AMD:HIP ROCM_PATH=/opt/rocm WANDB=1 bash examples/mlperf/training_submission_v6.0/tinycorp/benchmarks/llama31_8b/implementations/tinybox_8xMI350X/dev_run.sh 2>&1 | tee /root/train.log'
+tmux new-session -d -s train 'cd /root/tinygrad && COMGR_PATH=/opt/rocm/lib/libamd_comgr.so COMGR_3_PATH=/opt/rocm/lib/libamd_comgr.so CC=/opt/rocm/core-7.14/lib/llvm/bin/clang DEV=PCI+AMD:HIP ROCM_PATH=/opt/rocm WANDB=1 bash examples/mlperf/training_submission_v6.0/tinycorp/benchmarks/llama31_8b/implementations/tinybox_8xMI350X/dev_run.sh 2>&1 | tee /root/train.log'
 ```
 Attach with `tmux attach -t train`.

-### 5.1 Smoke test (beam search, 2 layers, real data)
-Always run beam first to validate the pipeline:
+### 5.1 Full training run
 ```bash
-tmux new-session -d -s beam 'cd /root/tinygrad && COMGR_PATH=/opt/rocm/lib/libamd_comgr.so COMGR_3_PATH=/opt/rocm/lib/libamd_comgr.so CC=/opt/rocm/core-7.14/lib/llvm/bin/clang DEV=AMD:HIP ROCM_PATH=/opt/rocm bash examples/mlperf/training_submission_v6.0/tinycorp/benchmarks/llama31_8b/implementations/tinybox_8xMI350X/dev_beam.sh 2>&1 | tee /root/beam.log'
-```
-
-The beam test runs 10 training steps with 2 layers. Expected results:
- ~0.29s per step after warmup
- ~700K GFLOPS, ~7% MFU (low because only 2 layers)
- ~380 GB VRAM used
- Loss stable at ~12.55 with random init
-
-### 5.2 Full training run
-```bash
-tmux new-session -d -s train 'cd /root/tinygrad && COMGR_PATH=/opt/rocm/lib/libamd_comgr.so COMGR_3_PATH=/opt/rocm/lib/libamd_comgr.so CC=/opt/rocm/core-7.14/lib/llvm/bin/clang DEV=AMD:HIP ROCM_PATH=/opt/rocm WANDB=1 bash examples/mlperf/training_submission_v6.0/tinycorp/benchmarks/llama31_8b/implementations/tinybox_8xMI350X/dev_run.sh 2>&1 | tee /root/train.log'
+tmux new-session -d -s train 'cd /root/tinygrad && COMGR_PATH=/opt/rocm/lib/libamd_comgr.so COMGR_3_PATH=/opt/rocm/lib/libamd_comgr.so CC=/opt/rocm/core-7.14/lib/llvm/bin/clang DEV=PCI+AMD:HIP ROCM_PATH=/opt/rocm WANDB=1 bash examples/mlperf/training_submission_v6.0/tinycorp/benchmarks/llama31_8b/implementations/tinybox_8xMI350X/dev_run.sh 2>&1 | tee /root/train.log'
 ```

 ## Environment Variable Reference
@@ -134,7 +137,7 @@ tmux new-session -d -s train 'cd /root/tinygrad && COMGR_PATH=/opt/rocm/lib/liba
 | `COMGR_PATH` | `/opt/rocm/lib/libamd_comgr.so` | tinygrad's DLL loader needs explicit path to find comgr 3.3 |
 | `COMGR_3_PATH` | `/opt/rocm/lib/libamd_comgr.so` | comgr 3.x uses a separate `comgr_3` module with its own path var |
 | `CC` | `/opt/rocm/core-7.14/lib/llvm/bin/clang` | System clang doesn't know gfx950; must use ROCm's bundled clang |
-| `DEV` | `AMD:HIP` | Force HIPRenderer (comgr-based) over HIPCCRenderer (hipcc subprocess) |
+| `DEV` | `PCI+AMD:HIP` | Force HIPRenderer (comgr-based) over HIPCCRenderer (hipcc subprocess) |
 | `ROCM_PATH` | `/opt/rocm` | Script defaults to `/opt/rocm-7.1.1` which doesn't exist |
 | `WANDB` | `1` | Enable wandb logging (off by default) |

@@ -150,7 +153,7 @@ tmux new-session -d -s train 'cd /root/tinygrad && COMGR_PATH=/opt/rocm/lib/liba
 | ASM GEMM | `extra/gemm/cdna_asm_gemm.py` — gfx950 MFMA assembly, MXFP4 |
 | Flash attention | `extra/thunder/amd/fa.py` |
 | Fused kernels | `extra/llama_kernels/` — rmsnorm, silu, quantize, fused_ce |
-| GPU driver | `tinygrad/runtime/ops_amd.py` — HCQ, direct KFD ioctl |
+| GPU driver | `tinygrad/runtime/ops_amd.py` — HCQ, using the AM userspace PCI interface |
 | Renderer | `tinygrad/renderer/cstyle.py` — HIPRenderer for gfx950 |
 | comgr compiler | `tinygrad/runtime/support/compiler_amd.py` — HIPCompiler using comgr 3.3 |

@@ -190,28 +193,5 @@ $ lspci -nn | grep AMD
 ```
 CPU flags include `hypervisor`. `dmesg` shows `Hypervisor detected: KVM`.

-### Working path: amdgpu driver (KFDIface)
-The amdgpu driver loads on boot and binds to all 8 GPUs, creating `/dev/kfd` and 64 renderD nodes (`/dev/dri/renderD128` through `/dev/dri/renderD191`). tinygrad's `KFDIface` enumerates GPUs through `/sys/devices/virtual/kfd/kfd/topology/nodes` and uses `/dev/kfd` for ioctl. No PCI device ID patching is needed — the KFD path does not use `PCIIface` or `AMDev._run_discovery()`.
-
-This is the working configuration. No code changes to tinygrad are required.
-
-### PCIIface path (does not work on this VM)
-For reference, the `PCIIface` path was also explored but does not work in this KVM guest:
-
- `PCIIface` in `ops_amd.py` does not list device ID `0x75b0`. Adding it allows PCI detection but `AMDev._run_discovery()` fails because the VRAM BAR reads all `0xFF`.
- This was observed with the GPU unbound from any driver, after PCI reset, and with VFIO bound.
- VFIO binding (`vfio-pci` with `enable_unsafe_noiommu_mode=1`) succeeded but VRAM BAR still reads all `0xFF`.
- No IOMMU in guest — `dmesg` has no `AMD-Vi` entries, PCI devices have no `iommu_group` symlink.
-
-### amdgpu driver behavior
-On first boot, amdgpu loaded and bound to all 8 GPUs. On one boot it failed to initialize:
-```
-[  799.780369] amdgpu 0000:83:00.0: Failed to alloc msi vectors
-[  799.781476] amdgpu 0000:83:00.0: sw_init of IP block <vega20_ih> failed -22
-[  799.782724] amdgpu 0000:83:00.0: amdgpu_device_ip_init failed
-[  799.793885] amdgpu 0000:83:00.0: Fatal error during GPU init
-```
-On a subsequent boot, amdgpu initialized successfully (SMU initialized, VRAM ready). After unbinding all 8 GPUs from amdgpu, `rmmod amdgpu` wedged the module (stuck in "Unloading" state in `/proc/modules`), requiring a full VM reboot.
-
 ### No fan control
 No `fan*` or `pwm*` hwmon entries exist. Only `temp*`, `power*`, `freq*` are exposed. GPU temps read 56-63°C, power ~265W per GPU.
@@ -1,4 +1,4 @@
-import os, subprocess, sys, shlex
+import os, subprocess, sys, shlex, pickle
 from pathlib import Path
 from tinygrad.helpers import temp, getenv

@@ -23,5 +23,8 @@ if __name__ == "__main__":
      # AM_RESET=1 gets a clear trace, does not work on mi300 machines
      subprocess.run([sys.executable, *shlex.split(test)], cwd=EXAMPLES_DIR.parent.parent.parent,
                     env={**os.environ, "DEV":"AMD", "AM_RESET":"1" if not arch.startswith("gfx9") else "0", "VIZ":"-2", "PYTHONPATH":"."})
+      with open(PROFILE_PATH, "rb") as f: events = pickle.load(f)
+      with open(PROFILE_PATH, "wb") as f:
+        pickle.dump([e for e in events if type(e).__name__ in {"ProfilePMCEvent", "ProfileSQTTEvent", "ProfileProgramEvent"}], f)
      PROFILE_PATH.rename(dest:=EXAMPLES_DIR/arch/f"profile_{name}_run_{i}.pkl")
      print(f"saved SQTT trace to {dest}")
@@ -1,13 +1,11 @@
 #!/usr/bin/env python3
 import ctypes, pathlib, argparse, pickle, dataclasses, threading, itertools
-from decimal import Decimal
 from typing import Generator
 from tinygrad.helpers import temp, unwrap, DEBUG
 from tinygrad.runtime.ops_amd import ProfileSQTTEvent
 from tinygrad.runtime.autogen import rocprof
 from tinygrad.renderer.amd.dsl import Inst
-from tinygrad.helpers import ProfileEvent, ProfileRangeEvent, ProfilePointEvent
-from tinygrad.device import ProfileProgramEvent
+from tinygrad.device import ProfileDeviceEvent, ProfileProgramEvent
 from test.amd.disasm import disasm

@dataclasses.dataclass(frozen=True)
@@ -39,17 +37,18 @@ class WaveExec(WaveSlot):
    insts_array = (struct*(len(self.insts)//sz)).from_buffer(self.insts)
    for inst in insts_array:
      inst_typ = rocprof.enum_rocprofiler_thread_trace_decoder_inst_category_t.get(inst.category)
-      yield InstExec(inst_typ, inst.pc.address, inst.stall, inst.duration, inst.time)
+      yield InstExec(inst_typ.replace("ROCPROFILER_THREAD_TRACE_DECODER_", "") if inst_typ else "UNKNOWN",
+                     inst.pc.address, inst.stall, inst.duration, inst.time)

@dataclasses.dataclass(frozen=True)
 class OccEvent(WaveSlot):
  time:int
  start:int

-RunKey = tuple[str, int]
+RunKey = tuple[int, int]

 class _ROCParseCtx:
-  def __init__(self, sqtt_evs:list[ProfileSQTTEvent], disasms:dict[str, dict[int, Inst]]):
+  def __init__(self, sqtt_evs:list[ProfileSQTTEvent], disasms:dict[int, dict[int, Inst]]):
    self.sqtt_evs, self.disasms = iter(sqtt_evs), {k:{k2:(disasm(v2), v2.size()) for k2,v2 in v.items()} for k,v in disasms.items()}
    self.inst_execs:dict[RunKey, list[WaveExec]] = {}
    self.occ_events:dict[RunKey, list[OccEvent]] = {}
@@ -76,7 +75,7 @@ class _ROCParseCtx:
    self.inst_execs.setdefault(unwrap(self.active_run), []).append(WaveExec(ev.wave_id, ev.cu, ev.simd, unwrap(self.active_se), ev.begin_time,
                                                                             ev.end_time, insts_blob))

-def decode(sqtt_evs:list[ProfileSQTTEvent], disasms:dict[str, dict[int, Inst]]) -> _ROCParseCtx:
+def decode(sqtt_evs:list[ProfileSQTTEvent], disasms:dict[int, dict[int, Inst]]) -> _ROCParseCtx:
  ROCParseCtx = _ROCParseCtx(sqtt_evs, disasms)

  @rocprof.rocprof_trace_decoder_se_data_callback_t
@@ -129,83 +128,9 @@ def decode(sqtt_evs:list[ProfileSQTTEvent], disasms:dict[str, dict[int, Inst]])
    raise exc
  return ROCParseCtx

-def unpack_occ(viz_data, i:int, j:int, key:tuple[str, int], data:list, p:ProfileProgramEvent, target:str) -> dict:
-  from tinygrad.viz.serve import amd_decode, create_step, row_tuple
-  steps = viz_data.ctxs[i]["steps"]
-  if len(steps[j+1:]) > 0: return {"steps":[{k:v for k,v in s.items() if k != "data"} for s in steps[j+1:]]}
-  base = unwrap(p.base)
-  disasm:dict[int, Inst] = {addr+base:inst for addr,inst in amd_decode(unwrap(p.lib), target).items()}
-  rctx = decode(data, {p.tag:disasm})
-  cu_events:dict[str, list[ProfileEvent]] = {}
-  # ** inst traces
-  wave_insts:dict[str, dict[str, dict]] = {}
-  inst_units:dict[str, itertools.count] = {}
-  for w in rctx.inst_execs.get(key, []):
-    if (u:=w.wave_loc) not in inst_units: inst_units[u] = itertools.count(0)
-    n = next(inst_units[u])
-    if (events:=cu_events.get(w.cu_loc)) is None: cu_events[w.cu_loc] = events = []
-    events.append(ProfileRangeEvent(f"SIMD:{w.simd}", loc:=f"INST WAVE:{w.wave_id} N:{n}", Decimal(w.begin_time), Decimal(w.end_time)))
-    wave_insts.setdefault(w.cu_loc, {})[f"{u} N:{n}"] = {"wave":w, "disasm":disasm, "prg":p, "run_number":n, "loc":loc}
-  # ** occ traces (only WAVESTART/WAVEEND)
-  units:dict[str, itertools.count] = {}
-  wave_start:dict[str, int] = {}
-  for occ in rctx.occ_events.get(key, []):
-    if (u:=occ.wave_loc) not in units: units[u] = itertools.count(0)
-    if u in inst_units: continue
-    if occ.start: wave_start[u] = occ.time
-    else:
-      if (events:=cu_events.get(occ.cu_loc)) is None: cu_events[occ.cu_loc] = events = []
-      events.append(ProfileRangeEvent(f"SIMD:{occ.simd}", f"OCC WAVE:{occ.wave_id} N:{next(units[u])}", Decimal(wave_start.pop(u)),Decimal(occ.time)))
-  # ** split graph by CU
-  for cu in sorted(cu_events, key=row_tuple):
-    steps.append(create_step(f"{cu} {len(cu_events[cu])}", ("/cu-sqtt", i, len(steps)), depth=1,
-                             data=[ProfilePointEvent(unit, "start", unit, ts=Decimal(0)) for unit in units]+cu_events[cu]))
-    for k in sorted(wave_insts.get(cu, []), key=row_tuple):
-      wd = wave_insts[cu][k]
-      steps.append(create_step(k.replace(cu, ""), ("/amd-sqtt-insts", i, len(steps)), loc=wd["loc"], depth=2,
-                               data={"fxn":unpack_insts, "args":(wd,)}))
-  return {"steps":[{k:v for k,v in s.items() if k != "data"} for s in steps[j+1:]]}
-
-def unpack_insts(viz_data, i:int, j:int, data:dict) -> dict:
-  columns = ["PC", "Instruction", "Hits", "Cycles", "Stall", "Type"]
-  inst_columns = ["N", "Clk", "Idle", "Dur", "Stall"]
-  # Idle:     The total time gap between the completion of previous instruction and the beginning of the current instruction.
-  #           The idle time can be caused by:
-  #             * Arbiter loss
-  #             * Source or destination register dependency
-  #             * Instruction cache miss
-  # Stall:    The total number of cycles the hardware pipe couldn't issue an instruction.
-  # Duration: Total latency in cycles, defined as "Stall time + Issue time" for gfx9 or "Stall time + Execute time" for gfx10+.
-  prev_instr = (w:=data["wave"]).begin_time
-  pc_to_inst = data["disasm"]
-  start_pc = None
-  rows:dict[int, dict] = {}
-  for pc, inst in pc_to_inst.items():
-    if start_pc is None: start_pc = pc
-    rows[pc] = {"pc":pc-start_pc, "inst":str(inst), "hit_count":0, "dur":0, "stall":0, "type":"", "hits":{"cols":inst_columns, "rows":[]}}
-  for e in w.unpack_insts():
-    if not (inst:=rows[e.pc]).get("type"): inst["type"] = str(e.typ).split("_")[-1]
-    inst["hit_count"] += 1
-    inst["dur"] += e.dur
-    inst["stall"] += e.stall
-    inst["hits"]["rows"].append((inst["hit_count"]-1, e.time, max(0, e.time-prev_instr), e.dur, e.stall))
-    prev_instr = max(prev_instr, e.time + e.dur)
-  summary = [{"label":"Total Cycles", "value":w.end_time-w.begin_time}, {"label":"SE", "value":w.se}, {"label":"CU", "value":w.cu},
-             {"label":"SIMD", "value":w.simd}, {"label":"Wave ID", "value":w.wave_id}, {"label":"Run number", "value":data["run_number"]}]
-  return {"rows":[tuple(v.values()) for v in rows.values()], "cols":columns, "metadata":[summary], "ref":viz_data.ref_map.get(data["prg"].name)}
-
-def print_data(data:dict) -> None:
-  from tabulate import tabulate
-  # plaintext
-  if "src" in data: print(data["src"])
-  # table format
-  elif "cols" in data:
-    print(tabulate([r[:len(data["cols"])] for r in data["rows"]], headers=data["cols"], tablefmt="github"))
-
 def main() -> None:
-  import tinygrad.viz.serve as viz
-  from tinygrad.uop.ops import RewriteTrace
-  data = viz.VizData()
+  from tabulate import tabulate
+  from tinygrad.viz.serve import amd_decode

  parser = argparse.ArgumentParser()
  parser.add_argument('--profile', type=pathlib.Path, metavar="PATH", help='Path to profile (optional file, default: latest profile)',
@@ -216,26 +141,28 @@ def main() -> None:

  with args.profile.open("rb") as f: profile = pickle.load(f)

-  viz.get_profile(profile, data=data)
-
  # List all kernels
  if args.kernel is None:
-    for c in data.ctxs:
-      print(c["name"])
-      for s in c["steps"]: print("  "+s["name"])
+    for p in profile:
+      if isinstance(p, ProfileProgramEvent) and p.device.startswith("AMD"): print(p.name)
    return None

-  # Find kernel trace
-  trace = next((c for c in data.ctxs if c["name"] == f"SQTT {args.kernel}"), None)
-  if not trace: raise RuntimeError(f"no matching trace for {args.kernel}")
-  n = 0
-  for s in trace["steps"]:
-    if "PKTS" in s["name"]: continue
-    print(s["name"])
-    ret = viz.get_render(data, s["query"])
-    print_data(ret)
-    n += 1
-    if n > args.n: break
+  prg = next((p for p in profile if isinstance(p, ProfileProgramEvent) and p.name == args.kernel), None)
+  dev = next((p for p in profile if isinstance(p, ProfileDeviceEvent) and p.device == prg.device), None)
+  assert prg is not None and dev is not None, "must have program binary and device props"
+  target = f"gfx{dev.props['gfx_target_version']//1000}"
+  sqtt = [p for p in profile if isinstance(p, ProfileSQTTEvent) and p.kern == prg.tag]
+
+  pc_to_inst = {addr+prg.base:inst for addr,inst in amd_decode(prg.lib, target).items()}
+  rctx = decode(sqtt, {prg.tag:pc_to_inst})
+  waves = sorted(itertools.chain.from_iterable(rctx.inst_execs.values()), key=lambda w:(w.se, w.cu, w.simd, w.wave_id, w.begin_time))
+  if not waves: raise RuntimeError(f"no instruction traces for {args.kernel}")
+  run_numbers:dict[str, itertools.count] = {}
+  for w in itertools.islice(waves, args.n):
+    if w.wave_loc not in run_numbers: run_numbers[w.wave_loc] = itertools.count()
+    print(f"{w.wave_loc} N:{next(run_numbers[w.wave_loc])} Total Cycles:{w.end_time-w.begin_time}")
+    rows = [(e.time, f"0x{e.pc:x}", pc_to_inst[e.pc], e.typ, e.dur, e.stall) for e in w.unpack_insts()]
+    print(tabulate(rows, headers=("Timestamp", "PC", "Instruction", "Type", "Duration", "Stall"), tablefmt="github"))

 if __name__ == "__main__":
  main()
@@ -19,16 +19,33 @@ def _sharded_empty(shape:Tensor, ref:Tensor, axis:int|None, dtype:DTypeLike|None
@functools.cache
 def custom_fused_qkv_rope_forward(q:UOp, k:UOp, v:UOp, xqkv:UOp, freqs_cis:UOp,
                                  device:str, arch:str, B:int, N:int, H:int, H_KV:int, D:int):
-  code = (pathlib.Path(__file__).parent / "fused_qkv_rope.cpp").read_text()
-  threads = 256
-  thread_idx = UOp.special(threads, "lidx0")
-  block_idx_x, block_idx_y = UOp.special(B, "gidx0"), UOp.special(N, "gidx1")
-  sink = UOp.sink(q.base, k.base, v.base, xqkv.base, freqs_cis.base, thread_idx, block_idx_x, block_idx_y,
-                  arg=KernelInfo(name="fused_qkv_rope_forward"))
-  compile_args = ["-std=c++20", "-ffast-math", f"-DATTN_B={B}", f"-DATTN_N={N}", f"-DATTN_H={H}",
-                  f"-DATTN_H_KV={H_KV}", f"-DATTN_D={D}", f"-DTHREADS_PER_BLOCK={threads}"]
-  lib = HIPCCCompiler(arch, compile_args).compile_cached(code)
-  return UOp(Ops.PROGRAM, src=(sink, UOp(Ops.LINEAR, src=(*sink.src, sink)), UOp(Ops.SOURCE, arg=code), UOp(Ops.BINARY, arg=lib)))
+  group_size = H // H_KV
+  q, k, v = q.reshape(B, N, H, D), k.reshape(B, N, H_KV, D), v.reshape(B, N, H_KV, D)
+  xqkv = xqkv.reshape(B, N, H_KV, group_size + 2, D)
+  b, n = UOp.range(B, 0), UOp.range(N, 1)
+  pair = UOp.range(D // 2, 2)
+  even = pair * 2
+  c = freqs_cis[0, n, 0, pair, 0].cast(dtypes.float)
+  s = freqs_cis[0, n, 0, pair, 1].cast(dtypes.float)
+  ordered:UOp|None = None
+  for kvh in range(H_KV):
+    q_out, k_out, v_out = (x.after(ordered) if ordered is not None else x for x in (q, k, v))
+    x_in = xqkv.after(ordered) if ordered is not None else xqkv
+    stores:list[UOp] = []
+    for rep in range(group_size):
+      a = x_in[b, n, kvh, rep, even].cast(dtypes.float)
+      bb = x_in[b, n, kvh, rep, even + 1].cast(dtypes.float)
+      h = kvh * group_size + rep
+      stores += [q_out[b, n, h, even].store((a * c - bb * s).cast(q.dtype)), q_out[b, n, h, even + 1].store((a * s + bb * c).cast(q.dtype))]
+    a = x_in[b, n, kvh, group_size, even].cast(dtypes.float)
+    bb = x_in[b, n, kvh, group_size, even + 1].cast(dtypes.float)
+    stores += [k_out[b, n, kvh, even].store((a * c - bb * s).cast(k.dtype)),
+               k_out[b, n, kvh, even + 1].store((a * s + bb * c).cast(k.dtype)),
+               v_out[b, n, kvh, even].store(x_in[b, n, kvh, group_size + 1, even]),
+               v_out[b, n, kvh, even + 1].store(x_in[b, n, kvh, group_size + 1, even + 1])]
+    ordered = UOp.group(*stores)
+  assert ordered is not None
+  return ordered.end(pair, n, b).sink(arg=KernelInfo(name="fused_qkv_rope_forward"))

@functools.cache
 def custom_fused_qkv_rope_backward(dxqkv:UOp, dq:UOp, dk:UOp, dv:UOp, freqs_cis:UOp,
@@ -109,49 +126,6 @@ def fused_qkv_rope(xqkv:Tensor, freqs_cis:Tensor, n_heads:int, n_kv_heads:int, h
 def _sharded_empty_like(ref:Tensor, axis:int|None=None) -> Tensor:
  return _sharded_empty(ref.shape, ref, axis)

-@functools.cache
-def _windowed_lse(xq:Tensor, xk:Tensor, sinks, W:int) -> Tensor:
-  B, N, H, hd = xq.shape
-  H_KV = xk.shape[2]; R = H // H_KV; nb = N // W; sm = hd ** -0.5
-  q = xq.reshape(B, N, H_KV, R, hd).permute(0, 2, 3, 1, 4).reshape(B, H_KV, R, nb, W, hd).float()
-  k = xk.permute(0, 2, 1, 3).reshape(B, H_KV, 1, nb, W, hd).float()
-  k_prev = k.pad((None, None, None, (1, 0), None, None))[:, :, :, :nb]
-  sc_d = (q @ k.transpose(-1, -2)) * sm
-  sc_p = (q @ k_prev.transpose(-1, -2)) * sm
-  li, lj = Tensor.arange(W).reshape(W, 1), Tensor.arange(W).reshape(1, W)
-  pv = (Tensor.arange(nb).reshape(nb, 1, 1) >= 1)
-  sc_d = (lj <= li).where(sc_d, -float("inf"))
-  sc_p = ((li < lj) & pv).where(sc_p, -float("inf"))
-  m = sc_d.max(-1, keepdim=True).maximum(sc_p.max(-1, keepdim=True))
-  if sinks is not None: m = m.maximum(sinks.reshape(1, H_KV, R, 1, 1, 1).float())
-  denom = (sc_d - m).exp().sum(-1, keepdim=True) + (sc_p - m).exp().sum(-1, keepdim=True)
-  if sinks is not None: denom = denom + (sinks.reshape(1, H_KV, R, 1, 1, 1).float() - m).exp()
-  return (m + denom.log()).reshape(B, H, N).unsqueeze(2)  # (B, H, 1, N), matches saved l_vec
-
-def _windowed_delta(xq:Tensor, xk:Tensor, xv:Tensor, do:Tensor, sinks, W:int) -> Tensor:
-  B, N, H, hd = xq.shape
-  H_KV = xk.shape[2]; R = H // H_KV; nb = N // W; sm = hd ** -0.5
-  q = xq.reshape(B, N, H_KV, R, hd).permute(0, 2, 3, 1, 4).reshape(B, H_KV, R, nb, W, hd).float()
-  k = xk.permute(0, 2, 1, 3).reshape(B, H_KV, 1, nb, W, hd).float()
-  v = xv.permute(0, 2, 1, 3).reshape(B, H_KV, 1, nb, W, hd).float()
-  dob = do.reshape(B, N, H_KV, R, hd).permute(0, 2, 3, 1, 4).reshape(B, H_KV, R, nb, W, hd).float()
-  k_prev = k.pad((None, None, None, (1, 0), None, None))[:, :, :, :nb]
-  v_prev = v.pad((None, None, None, (1, 0), None, None))[:, :, :, :nb]
-  sc_d = (q @ k.transpose(-1, -2)) * sm
-  sc_p = (q @ k_prev.transpose(-1, -2)) * sm
-  li, lj = Tensor.arange(W).reshape(W, 1), Tensor.arange(W).reshape(1, W)
-  pv = (Tensor.arange(nb).reshape(nb, 1, 1) >= 1)
-  sc_d = (lj <= li).where(sc_d, -float("inf"))
-  sc_p = ((li < lj) & pv).where(sc_p, -float("inf"))
-  m = sc_d.max(-1, keepdim=True).maximum(sc_p.max(-1, keepdim=True))
-  if sinks is not None: m = m.maximum(sinks.reshape(1, H_KV, R, 1, 1, 1).float())
-  e_d, e_p = (sc_d - m).exp(), (sc_p - m).exp()
-  denom = e_d.sum(-1, keepdim=True) + e_p.sum(-1, keepdim=True)
-  if sinks is not None: denom = denom + (sinks.reshape(1, H_KV, R, 1, 1, 1).float() - m).exp()
-  o = ((e_d / denom) @ v) + ((e_p / denom) @ v_prev)
-  delta = (dob * o).sum(-1)
-  return delta.reshape(B, H, N).unsqueeze(2)
-
 def _fa_grad_fxn(B, H, N, D, H_local, H_KV_local, H_KV, B_local, shard_axis, shard_axis_t, single_device, arch, has_sink, window=0):
  def grad(dou:UOp, ker:UOp) -> tuple:
    do = Tensor(dou, device=dou.device)
@@ -160,8 +134,6 @@ def _fa_grad_fxn(B, H, N, D, H_local, H_KV_local, H_KV, B_local, shard_axis, sha
    xq = Tensor(ker.src[3], device=ker.src[3].device)
    xk = Tensor(ker.src[4], device=ker.src[4].device)
    xv = Tensor(ker.src[5], device=ker.src[5].device)
-    if window:
-      l_vec = _windowed_lse(xq, xk, Tensor(ker.src[6], device=ker.src[6].device) if has_sink else None, window)

    dq = _sharded_empty((B, H, N, D), xq, axis=shard_axis_t)
    GROUP_SIZE = H_local // H_KV_local
@@ -172,8 +144,6 @@ def _fa_grad_fxn(B, H, N, D, H_local, H_KV_local, H_KV, B_local, shard_axis, sha
    # delta_vec = (do * attn).sum(-1, dtype=dtypes.float32).transpose(1, 2).unsqueeze(-2).detach()
    delta_vec = _sharded_empty((B, H, 1, N), xq, dtype=dtypes.float32, axis=shard_axis_t)
    delta_vec, dq = Tensor.custom_kernel(delta_vec, dq, attn, do, fxn=functools.partial(custom_fa_backward_pre, device=single_device, arch=arch, B=B_local, N=N, H=H_local, H_KV=H_KV_local, D=D))[:2]
-    if window:
-      delta_vec = _windowed_delta(xq, xk, xv, do, Tensor(ker.src[6], device=ker.src[6].device) if has_sink else None, window)

    dq, dk_partial, dv_partial = Tensor.custom_kernel(dq, dk_partial, dv_partial, do, xq, xk, xv, l_vec, delta_vec, fxn=functools.partial(custom_fa_backward, device=single_device, arch=arch, B=B_local, N=N, H=H_local, H_KV=H_KV_local, D=D, window=window))[:3]

@@ -269,7 +269,9 @@ __global__ void attend_ker(bf16 *O_ptr, float *L_vec_ptr, bf16 *Q_ptr, bf16 *K_p

    qo_tile<D, float> q_reg_fl;
    load<1, qo_tile<D, float>, _gl_QKVO>(q_reg_fl, g.Qg, {batch_idx, tile_idx, head_idx, 0});
+    #if !WINDOW
    mul(q_reg_fl, q_reg_fl, TEMPERATURE_SCALE);  // Use sqrtf for clarity
+    #endif
    copy(q_reg, q_reg_fl);
    transpose(q_reg_transposed, q_reg);

@@ -288,6 +290,9 @@ __global__ void attend_ker(bf16 *O_ptr, float *L_vec_ptr, bf16 *Q_ptr, bf16 *K_p
    zero(att_block[0]);
    transpose(k_reg_transposed, k_reg);
    mma_AtB(att_block[0], k_reg_transposed, q_reg_transposed, att_block[0]);
+    #if WINDOW
+    mul(att_block[0], att_block[0], TEMPERATURE_SCALE);
+    #endif
    __builtin_amdgcn_sched_barrier(0);
    if constexpr (causal) {
        const int kv_end_pos = (min_tile + 1) * KV_BLOCK_SIZE;
@@ -337,6 +342,9 @@ __global__ void attend_ker(bf16 *O_ptr, float *L_vec_ptr, bf16 *Q_ptr, bf16 *K_p
        zero(att_block[1]);
        transpose(k_reg_transposed, k_reg);
        mma_AtB(att_block[1], k_reg_transposed, q_reg_transposed, att_block[1]);
+        #if WINDOW
+        mul(att_block[1], att_block[1], TEMPERATURE_SCALE);
+        #endif
 #if WINDOW
        // window masks interior tiles that causal skips
        mask_kv_tile(att_block[1], tile_idx, j - 2, neg_inf_v, lane);
@@ -401,6 +409,9 @@ __global__ void attend_ker(bf16 *O_ptr, float *L_vec_ptr, bf16 *Q_ptr, bf16 *K_p
        zero(att_block[0]);
        transpose(k_reg_transposed, k_reg);
        mma_AtB(att_block[0], k_reg_transposed, q_reg_transposed, att_block[0]);
+        #if WINDOW
+        mul(att_block[0], att_block[0], TEMPERATURE_SCALE);
+        #endif
        //      Finish softmax for QK1
        exp2(att_block[1].tiles[1][0], att_block[1].tiles[1][0]);
        mul(norm_vec, norm_vec, scale_vec);
@@ -469,6 +480,9 @@ __global__ void attend_ker(bf16 *O_ptr, float *L_vec_ptr, bf16 *Q_ptr, bf16 *K_p
    zero(att_block[1]);
    transpose(k_reg_transposed, k_reg);
    mma_AtB(att_block[1], k_reg_transposed, q_reg_transposed, att_block[1]);
+    #if WINDOW
+    mul(att_block[1], att_block[1], TEMPERATURE_SCALE);
+    #endif
    //      Finish softmax for QK2
    exp2(att_block[0].tiles[1][0], att_block[0].tiles[1][0]);
    mul(norm_vec, norm_vec, scale_vec);
@@ -535,6 +549,9 @@ __global__ void attend_ker(bf16 *O_ptr, float *L_vec_ptr, bf16 *Q_ptr, bf16 *K_p
    zero(att_block[0]);
    transpose(k_reg_transposed, k_reg);
    mma_AtB(att_block[0], k_reg_transposed, q_reg_transposed, att_block[0]);
+    #if WINDOW
+    mul(att_block[0], att_block[0], TEMPERATURE_SCALE);
+    #endif
    //      Finish softmax for QK3
    exp2(att_block[1].tiles[1][0], att_block[1].tiles[1][0]);
    mul(norm_vec, norm_vec, scale_vec);
@@ -597,6 +614,9 @@ __global__ void attend_ker(bf16 *O_ptr, float *L_vec_ptr, bf16 *Q_ptr, bf16 *K_p
    zero(att_block[1]);
    transpose(k_reg_transposed, k_reg);
    mma_AtB(att_block[1], k_reg_transposed, q_reg_transposed, att_block[1]);
+    #if WINDOW
+    mul(att_block[1], att_block[1], TEMPERATURE_SCALE);
+    #endif
    //      Finish softmax for QK4
    exp2(att_block[0].tiles[1][0], att_block[0].tiles[1][0]);
    mul(norm_vec, norm_vec, scale_vec);
@@ -1,69 +0,0 @@
-#include <hip/hip_runtime.h>
-#include <hip/hip_bf16.h>
-
-#ifndef ATTN_B
-#define ATTN_B 2
-#endif
-#ifndef ATTN_N
-#define ATTN_N 8192
-#endif
-#ifndef ATTN_H
-#define ATTN_H 32
-#endif
-#ifndef ATTN_H_KV
-#define ATTN_H_KV 8
-#endif
-#ifndef ATTN_D
-#define ATTN_D 128
-#endif
-#ifndef THREADS_PER_BLOCK
-#define THREADS_PER_BLOCK 256
-#endif
-
-constexpr int GROUP_SIZE = ATTN_H / ATTN_H_KV;
-constexpr int HALF_D = ATTN_D / 2;
-constexpr int PACKED_D = (GROUP_SIZE + 2) * ATTN_D;
-
-extern "C" __global__ __launch_bounds__(THREADS_PER_BLOCK) void
-fused_qkv_rope_forward(
-    __hip_bfloat16*       __restrict__ q,
-    __hip_bfloat16*       __restrict__ k,
-    __hip_bfloat16*       __restrict__ v,
-    const __hip_bfloat16* __restrict__ xqkv,
-    const __hip_bfloat16* __restrict__ freqs_cis) {
-  const int b = blockIdx.x;
-  const int n = blockIdx.y;
-  const int bn = b * ATTN_N + n;
-  const int packed_bn = bn * ATTN_H_KV * PACKED_D;
-  const int q_bn = bn * ATTN_H * ATTN_D;
-  const int kv_bn = bn * ATTN_H_KV * ATTN_D;
-
-  if (threadIdx.x < HALF_D) {
-    const int pair = threadIdx.x;
-    const int even = pair << 1;
-    const float c = static_cast<float>(freqs_cis[((n * HALF_D + pair) * 2) + 0]);
-    const float s = static_cast<float>(freqs_cis[((n * HALF_D + pair) * 2) + 1]);
-
-    for (int kvh = 0; kvh < ATTN_H_KV; kvh++) {
-      const int base = packed_bn + kvh * PACKED_D;
-
-      for (int rep = 0; rep < GROUP_SIZE; rep++) {
-        const int qbase = base + rep * ATTN_D;
-        const int h = kvh * GROUP_SIZE + rep;
-        const float a = static_cast<float>(xqkv[qbase + even]);
-        const float bb = static_cast<float>(xqkv[qbase + even + 1]);
-        const int out = q_bn + h * ATTN_D + even;
-        q[out] = static_cast<__hip_bfloat16>(a * c - bb * s);
-        q[out + 1] = static_cast<__hip_bfloat16>(a * s + bb * c);
-      }
-
-      const float a = static_cast<float>(xqkv[base + GROUP_SIZE * ATTN_D + even]);
-      const float bb = static_cast<float>(xqkv[base + GROUP_SIZE * ATTN_D + even + 1]);
-      const int out = kv_bn + kvh * ATTN_D + even;
-      k[out] = static_cast<__hip_bfloat16>(a * c - bb * s);
-      k[out + 1] = static_cast<__hip_bfloat16>(a * s + bb * c);
-      v[out] = xqkv[base + (GROUP_SIZE + 1) * ATTN_D + even];
-      v[out + 1] = xqkv[base + (GROUP_SIZE + 1) * ATTN_D + even + 1];
-    }
-  }
-}
@@ -0,0 +1,80 @@
+#include "kittens.cuh"
+
+using namespace kittens;
+
+#ifndef ROUTER_M
+#define ROUTER_M 16384
+#endif
+#ifndef ROUTER_K
+#define ROUTER_K 2880
+#endif
+#ifndef ROUTER_E
+#define ROUTER_E 32
+#endif
+
+constexpr int BLOCK_M = 64;
+constexpr int BLOCK_K = 64;
+constexpr int NUM_WARPS = 4;
+constexpr int THREADS = NUM_WARPS * WARP_THREADS;
+
+using G = kittens::group<NUM_WARPS>;
+using XST = st_bf<BLOCK_M, BLOCK_K, st_16x32_s>;
+using WST = st_bf<ROUTER_E, BLOCK_K, st_16x32_s>;
+using XRT = rt_bf<16, BLOCK_K, row_l, rt_16x32_s>;
+using WRT = rt_bf<ROUTER_E, BLOCK_K, row_l, rt_16x32_s>;
+using CRT = rt_fl<16, ROUTER_E, col_l, rt_16x16_s>;
+
+static_assert(ROUTER_M % BLOCK_M == 0, "ROUTER_M must be divisible by 64");
+static_assert(ROUTER_K % BLOCK_K == 0, "ROUTER_K must be divisible by 64");
+static_assert(ROUTER_E == 32, "the small-N tile is specialized for 32 experts");
+
+extern "C" __global__ __launch_bounds__(THREADS, 4) void moe_router_mfma(
+    float *__restrict__ out, bf16 *__restrict__ x_ptr, bf16 *__restrict__ weight_ptr,
+    bf16 *__restrict__ bias) {
+  gl<bf16, 1, 1, ROUTER_M, ROUTER_K> X{x_ptr, nullptr, nullptr, nullptr, nullptr};
+  gl<bf16, 1, 1, ROUTER_E, ROUTER_K> W{weight_ptr, nullptr, nullptr, nullptr, nullptr};
+
+  __shared__ XST Xs;
+  __shared__ WST Ws;
+
+  XRT xr;
+  WRT wr;
+  CRT accum;
+  zero(accum);
+
+  const int block_m = __builtin_amdgcn_workgroup_id_x();
+  const int warp_m = warpid();
+
+  #pragma unroll
+  for (int kk = 0; kk < ROUTER_K / BLOCK_K; kk++) {
+    G::load(Xs, X, {0, 0, block_m, kk});
+    G::load(Ws, W, {0, 0, 0, kk});
+    asm volatile("s_waitcnt vmcnt(0)");
+    asm volatile("s_waitcnt lgkmcnt(0)");
+    __builtin_amdgcn_s_barrier();
+
+    load(xr, subtile_inplace<16, BLOCK_K>(Xs, {warp_m, 0}));
+    load(wr, subtile_inplace<ROUTER_E, BLOCK_K>(Ws, {0, 0}));
+    asm volatile("s_waitcnt lgkmcnt(0)");
+    __builtin_amdgcn_s_setprio(1);
+    mma_ABt(accum, xr, wr, accum);
+    __builtin_amdgcn_s_setprio(0);
+    __builtin_amdgcn_sched_barrier(0);
+    __builtin_amdgcn_s_barrier();
+  }
+
+  // A 16x16 MFMA accumulator is column-layout: each lane owns four consecutive rows
+  // at one column. Store all 64x32 FP32 results directly; no padded or undersized output ABI.
+  const int lane = laneid();
+  const int row0 = block_m * BLOCK_M + warp_m * 16 + 4 * (lane / 16);
+  const int lane_col = lane % 16;
+  #pragma unroll
+  for (int j = 0; j < ROUTER_E / 16; j++) {
+    const int col = j * 16 + lane_col;
+    const float b = (float)bias[col];
+    const float vals[4] = {accum.tiles[0][j].data[0].x, accum.tiles[0][j].data[0].y,
+                           accum.tiles[0][j].data[1].x, accum.tiles[0][j].data[1].y};
+    #pragma unroll
+    for (int r = 0; r < 4; r++) out[(long long)(row0 + r) * ROUTER_E + col] = vals[r] + b;
+  }
+}
@@ -209,7 +209,7 @@ class ST:
    return cls(uop, rows, cols, layout, base_shape, ker)

  def swizzle(self, row, col):
-    swizzled_offset = self.base_shape.swizzle(row, col, self._uop.dtype.scalar())
+    swizzled_offset = self.base_shape.swizzle(row, col, self._uop.dtype)

    row = swizzled_offset // self.base_shape.cols
    col = swizzled_offset % self.base_shape.cols
@@ -1,38 +0,0 @@
-from tinygrad.tensor import Tensor
-from tinygrad.helpers import CHUNK_SIZE
-from tinygrad.nn.state import fs_load
-import argparse, math, hashlib
-
-def _python_hash_1mb(data:bytes|bytearray):
-  chunks = [data[i:i+4096] for i in range(0, len(data), 4096)]
-  chunk_hashes = [hashlib.shake_128(chunk).digest(16) for chunk in chunks]
-  return hashlib.shake_128(b''.join(chunk_hashes)).digest(16)
-
-def hash_file(data: bytes|bytearray):
-  if len(data) % CHUNK_SIZE != 0: data += bytes(CHUNK_SIZE - len(data) % CHUNK_SIZE)
-  base_chunks = math.ceil(len(data) / CHUNK_SIZE)
-  tree_depth = math.ceil(math.log(base_chunks, CHUNK_SIZE // 16))
-
-  for _ in range(tree_depth + 1):
-    data_chunks = [data[i:i+CHUNK_SIZE] for i in range(0, len(data), CHUNK_SIZE)]
-    data_chunk_hashes = [_python_hash_1mb(chunk) for chunk in data_chunks]
-    data = b''.join(data_chunk_hashes)
-    if len(data) % CHUNK_SIZE != 0: data += bytes(CHUNK_SIZE - len(data) % CHUNK_SIZE)
-
-  return data[:16]
-
-if __name__ == "__main__":
-  parser = argparse.ArgumentParser()
-  parser.add_argument("--hash", type=str, required=True, help="file hash to fetch")
-  parser.add_argument("--len", type=int, required=True, help="file length to fetch")
-  parser.add_argument("--dest", type=str, required=True, help="destination path to save the file")
-  parser.add_argument("--check", action="store_true", help="verify the file hash after fetching")
-  args = parser.parse_args()
-
-  fs_load(Tensor(bytes.fromhex(args.hash), device="CPU"), args.len).to(f"disk:{args.dest}").realize()
-
-  if args.check:
-    with open(args.dest, "rb") as f:
-      data = f.read()
-      assert hash_file(data) == bytes.fromhex(args.hash), "Hash mismatch after fetching file"
-    print("File hash verified successfully!")
@@ -1,42 +0,0 @@
-import json, multiprocessing, functools
-from pathlib import Path
-
-from tinygrad.tensor import Tensor
-from tinygrad.helpers import tqdm, getenv
-from tinygrad.nn.state import fs_load
-
-raid_root = Path(getenv("RAID_ROOT", "/raid"))
-
-def fetch_file(item):
-  path, info = item
-  h, size = info["hash"], info["size"]
-
-  path = raid_root / Path(path)
-  path.parent.mkdir(parents=True, exist_ok=True)
-
-  try:
-    pt = fs_load(Tensor(bytes.fromhex(h), device="CPU"), size).to(f"disk:{path.as_posix()}").realize()
-  except Exception as e:
-    print(f"error fetching {path}, {h}, {size}: {e}")
-    raise
-
-  pt.uop.buffer.deallocate()
-
-def fetch_mapping(h, l):
-  mapping_tensor = fs_load(Tensor(bytes.fromhex(h)), l).realize()
-  mapping = mapping_tensor.data().tobytes().decode()
-  mapping = json.loads(mapping)
-  mapped_files = mapping.items()
-  return list(mapped_files)
-
-if __name__ == "__main__":
-  h, l = getenv("HASH", "d734f5e3be9f1e9d863bfaa4fc6c1ef2"), getenv("LENGTH", 175866113)
-
-  with multiprocessing.Pool(processes=1) as pool:
-    mapped_files = pool.apply(functools.partial(fetch_mapping, h, l))
-
-  print(f"fetched mapping for {len(mapped_files)} files")
-
-  with multiprocessing.Pool(processes=multiprocessing.cpu_count()) as pool:
-    for _ in tqdm(pool.imap_unordered(fetch_file, mapped_files), total=len(mapped_files)):
-      pass
@@ -1,32 +0,0 @@
-from pathlib import Path
-import multiprocessing, json
-
-from tinygrad.tensor import Tensor
-from tinygrad.helpers import tqdm
-from tinygrad.nn.state import fs_store
-
-raid_root = Path("/raid")
-
-def upload_file(path: Path):
-  pt = Tensor(path).realize()
-  h = fs_store(pt).realize()
-  pt.uop.realized.deallocate()
-  return h.data().hex(), path, pt.nbytes()
-
-if __name__ == "__main__":
-  raid_files = sorted([p for p in raid_root.rglob("*") if p.is_file()])
-  print(f"found {len(raid_files)} files in /raid")
-
-  mapping = {}
-  with multiprocessing.Pool(processes=multiprocessing.cpu_count()) as pool:
-    for h, p, s in tqdm(pool.imap_unordered(upload_file, raid_files), total=len(raid_files)):
-      mapping[p.relative_to(raid_root).as_posix()] = {"hash": h, "size": s}
-
-  # sort the mapping by key
-  mapping = dict(sorted(mapping.items()))
-
-  mapping = json.dumps(mapping).encode()
-  mapping_tensor = Tensor(mapping, device="CPU")
-  h = fs_store(mapping_tensor).realize()
-
-  print(f"final hash: {h.data().hex()}, size: {len(mapping)}")
@@ -4,7 +4,7 @@
 # A006 Lambda argument `input` is shadowing a Python builtin
 from tinygrad import Tensor, dtypes, Device
 from tinygrad.uop.ops import Ops, GroupOp
-from tinygrad.helpers import getenv, prod, strides_for_shape, argfix
+from tinygrad.helpers import getenv, prod, strides_for_shape
 import torch.lib
 TORCH_DEBUG = getenv("TORCH_DEBUG")
 import torch, pathlib, operator, functools, weakref
@@ -73,6 +73,12 @@ def wrap_view_op(fn):
    return wrap(ret)
  return _wrap

+# NOTE: list assignment raises IndexError on an out of range dim, and the index must be a tuple: a list of all ints is one advanced index
+def _index_dim(self, dim, idx):
+  idxs = [slice(None)] * self.ndim
+  idxs[dim] = idx
+  return self[tuple(idxs)]
+
 view_ops = {
  "aten.view": Tensor.reshape,
  "aten._unsafe_view": Tensor.reshape,  # when are views unsafe, and do we care?
@@ -82,15 +88,13 @@ view_ops = {
  "aten.transpose.int": Tensor.transpose,
  "aten.squeeze.dim": Tensor.squeeze,
  "aten.unsqueeze": Tensor.unsqueeze,
-  "aten.select.int": lambda self, dim, idx: self[(slice(None),) * (dim%self.ndim) + (idx,)],
+  "aten.select.int": _index_dim,
  "aten.permute": Tensor.permute,
  "aten.alias": lambda self: self,
  "aten.diagonal": Tensor.diagonal,
+  "aten.slice.Tensor": lambda self, dim=0, start=None, end=None, step=1: _index_dim(self, dim, slice(start, end, step)),
  }

-# torch 2.10 handles this natively
-if tuple(map(int, torch.__version__.split('.')[:2])) < (2, 10): view_ops.update({"aten.detach": Tensor.detach})
-
 for k,v in view_ops.items(): torch.library.impl(k.replace("aten.", "aten::"), "privateuseone")(wrap_view_op(v))

 def _get_view_ops(view): return getattr(view, "_view_ops", [])
@@ -99,46 +103,21 @@ def _apply_view_ops(target, ops):
  for fn, args, kwargs in ops: target = fn(target, *args, **kwargs)
  return target

-# similar to https://github.com/pytorch/pytorch/blob/main/aten/src/ATen/InferSize.h
-def _reshape_target_shape(shape:tuple[int, ...], args) -> tuple[int, ...]|None:
-  if not (req := argfix(*args)): return None
-  new_shape, infer_idx = [], -1
-  for i, s in enumerate(req):
-    if s is None: s = shape[i] if i < len(shape) else None
-    if not isinstance(s, int): return None
-    if s == -1:
-      if infer_idx != -1: return None
-      infer_idx = len(new_shape)
-    new_shape.append(s)
-  total = prod(shape)
-  if infer_idx != -1:
-    known = prod(x for x in new_shape if x != -1)
-    if known == 0:
-      if total != 0: return None
-      new_shape[infer_idx] = 0
-    else: new_shape[infer_idx] = total // known
-  return tuple(new_shape) if prod(new_shape) == total else None
-
-# TODO: can we get rid of this? only for test_flatten_reshape_add
+# a chain of reshapes is undone by reshaping the value back to the base
 def _try_simple_reshape_view_write(base: Tensor, view: Tensor, val: Tensor) -> bool:
  if not (ops := _get_view_ops(view)): return False
-  shapes = [base.shape]
-  for fn, args, _ in ops:
-    if fn is Tensor.reshape:
-      if not (next_shape := _reshape_target_shape(shapes[-1], args)): return False
-      shapes.append(next_shape)
-  if shapes[-1] != view.shape: return False
-  for s in reversed(shapes[:-1]): val = val.reshape(s)
-  base.assign(val)
+  if any(fn is not Tensor.reshape for fn, _, _ in ops): return False
+  base.assign(val.reshape(base.shape))
  return True

 def _view_write(base: Tensor, view: Tensor, value: Tensor) -> None:
  val = value if value.dtype == base.dtype else value.cast(base.dtype)
-  if view.shape == base.shape: return base.assign(val)
  if _try_simple_reshape_view_write(base, view, val): return
  idx_base = Tensor.arange(base.numel(), dtype=dtypes.int32).reshape(base.shape)
  idx_view = _apply_view_ops(idx_base, _get_view_ops(view)).reshape(-1)
-  flat_base = base.reshape(base.numel()).contiguous()
+  # clone, not contiguous: contiguous() on a base that already owns its buffer returns the base itself, and scattering
+  # into that is an in-place write to a buffer other tensors still hold, which setitem refuses
+  flat_base = base.reshape(base.numel()).clone()
  flat_base[idx_view] = val.reshape(-1)
  base.assign(flat_base.reshape(base.shape))

@@ -166,11 +145,6 @@ def _index_put_impl_(self, indices, values, accumulate=False, unsafe=False):
 def index_put(self, indices, values, accumulate=False):
  return aten.index_put(self.cpu(), [z.cpu() if isinstance(z, torch.Tensor) else None for z in indices], values.clone().cpu(), accumulate).tiny()

-@torch.library.impl("aten::isin.Tensor_Tensor_out", "privateuseone")
-def isin_tensor_tensor_out(x, y, *, assume_unique=False, invert=False, out=None):
-  result = (unwrap(x).unsqueeze(-1) == unwrap(y).flatten()).any(-1)
-  return out.copy_(wrap(~result if invert else result))
-
@torch.library.impl("aten::randperm.generator_out", "privateuseone")
 def randperm_generator(n, generator=None, out=None):
  if generator is not None: raise NotImplementedError("tinygrad torch backend does not support torch.Generator for randperm")
@@ -231,49 +205,6 @@ def as_strided(tensor:torch.Tensor, size, stride, storage_offset=None):
 def _reshape_alias(tensor:torch.Tensor, size, stride):
  return _as_strided(tensor, size, stride)

-@torch.library.impl("aten::empty_strided", "privateuseone")
-def empty_strided(size, stride, dtype=None, layout=None, device=None, pin_memory=False):
-  if TORCH_DEBUG: print(f"empty_strided {size=} {stride=} {dtype=} {layout=} {device=} {pin_memory=}")
-  ret = Tensor.empty(*size, dtype=_from_torch_dtype(dtype or torch.get_default_dtype()), device=_from_torch_device(device))
-  # TODO: should return with requested strides
-  return wrap(ret)
-
-@torch.library.impl("aten::empty.memory_format", "privateuseone")
-def empty_memory_format(size, dtype=None, layout=None, device=None, pin_memory=False, memory_format=None):
-  if TORCH_DEBUG: print(f"empty.memory_format {size=} {dtype=} {layout=} {device=} {pin_memory=} {memory_format=}")
-  ret = Tensor.empty(*size, dtype=_from_torch_dtype(dtype or torch.get_default_dtype()), device=_from_torch_device(device))
-  return wrap(ret)
-
-@torch.library.impl("aten::max_pool2d_with_indices", "privateuseone")
-def max_pool2d_with_indices(self:torch.Tensor, kernel_size:tuple[int, ...], stride=None, padding=0, dilation=1, ceil_mode=False):
-  # TODO: supprt stride [] in tinygrad?
-  if stride is not None and len(stride) == 0: stride = None
-  ret, idx = unwrap(self).max_pool2d(kernel_size, stride, dilation, padding, ceil_mode, return_indices=True)
-  return (wrap(ret), wrap(idx.cast(dtypes.int64)))
-
-@torch.library.impl("aten::max_pool2d_with_indices_backward", "privateuseone")
-def max_pool2d_with_indices_backward(grad_out:torch.Tensor, self:torch.Tensor, kernel_size:tuple[int, ...], stride=None, padding=0, dilation=1, ceil_mode=False, indices=None):
-  return wrap(Tensor.max_unpool2d(unwrap(grad_out), unwrap(indices), output_size=unwrap(self).shape))
-
-@torch.library.impl("aten::max_unpool2d", "privateuseone")
-def max_unpool2d(self:torch.Tensor, indices:torch.Tensor, output_size):
-  return wrap(unwrap(self).max_unpool2d(unwrap(indices), output_size=output_size))
-
-@torch.library.impl("aten::arange", "privateuseone")
-def arange(end, dtype=None, device=None, pin_memory=None):
-  has_float = isinstance(end, float)
-  return wrap(Tensor.arange(0, end, dtype=_from_torch_dtype(dtype or (torch.get_default_dtype() if has_float else torch.int64))))
-
-@torch.library.impl("aten::arange.start", "privateuseone")
-def arange_start(start, end, dtype=None, device=None, pin_memory=None):
-  has_float = any(isinstance(x, float) for x in (start, end))
-  return wrap(Tensor.arange(start, end, dtype=_from_torch_dtype(dtype or (torch.get_default_dtype() if has_float else torch.int64))))
-
-@torch.library.impl("aten::arange.start_step", "privateuseone")
-def arange_start_step(start, end, step, dtype=None, device=None, pin_memory=None):
-  has_float = any(isinstance(x, float) for x in (start, end, step))
-  return wrap(Tensor.arange(start, end, step, dtype=_from_torch_dtype(dtype or (torch.get_default_dtype() if has_float else torch.int64))))
-
@torch.library.impl("aten::convolution_overrideable", "privateuseone")
 def convolution_overrideable(input, weight, bias, stride, padding, dilation, transposed, output_padding, groups):
  if TORCH_DEBUG >= 1:
@@ -294,12 +225,27 @@ def convolution_backward_overrideable(grad_out, input, weight, stride, padding,
  grads = out.gradient(*[t for t,m in zip([input, weight, bias], output_mask) if m], gradient=grad_out)
  return tuple([wrap(grads.pop(0)) if m else None for m in output_mask])

-@torch.library.impl("aten::slice.Tensor", "privateuseone")
-@wrap_view_op
-def slice_tensor(self, dim=0, start=None, end=None, step=1):
-  slices = [slice(None)] * self.ndim
-  slices[dim] = slice(start, end, step)
-  return self[slices]
+# the functional scatters. without an impl aten falls back to a path that assumes a real storage: "self.has_storage() INTERNAL ASSERT FAILED"
+def _scatter_into(self, src, dim, index):
+  out = unwrap(self).clone()
+  slices = [slice(None)] * out.ndim
+  slices[dim] = index
+  out[slices] = unwrap(src).cast(out.dtype)  # torch casts src to self's dtype, tinygrad setitem demands they already match
+  return wrap(out)
+
+@torch.library.impl("aten::slice_scatter", "privateuseone")
+def slice_scatter(self, src, dim=0, start=None, end=None, step=1): return _scatter_into(self, src, dim, slice(start, end, step))
+
+@torch.library.impl("aten::select_scatter", "privateuseone")
+def select_scatter(self, src, dim, index): return _scatter_into(self, src, dim, index)
+
+@torch.library.impl("aten::diagonal_scatter", "privateuseone")
+def diagonal_scatter(self, src, offset=0, dim1=0, dim2=1):
+  # a diagonal is not one axis, so scatter through the flat indices it picks out
+  base, out = unwrap(self), unwrap(self).clone().reshape(-1)
+  idx = Tensor.arange(base.numel(), dtype=dtypes.int32).reshape(base.shape).diagonal(offset, dim1, dim2).reshape(-1)
+  out[idx] = unwrap(src).cast(base.dtype).reshape(-1)
+  return wrap(out.reshape(base.shape))

@torch.library.impl("aten::slice_backward", "privateuseone")
 def slice_backward(grad_out, input_sizes, dim, start, end, step):
@@ -341,19 +287,14 @@ for dim in [1, 2, 3]:
    torch.library.impl(f"aten::{pad_type}_pad{dim}d", "privateuseone")(functools.partial(pad_forward, mode=mode))
    torch.library.impl(f"aten::{pad_type}_pad{dim}d_backward", "privateuseone")(functools.partial(pad_backward, mode=mode))

-def upsample(self, size, align_corners=False, mode=None): return wrap(Tensor.interpolate(unwrap(self), size, mode=mode, align_corners=align_corners))
+# the schemas are all positional: (self, output_size, align_corners, *scales) for linear, (self, output_size, *scales) for nearest.
+def upsample(self, size, *args, mode=None):
+  return wrap(Tensor.interpolate(unwrap(self), size, mode=mode, align_corners=args[0] if mode == "linear" else False))
 for i,pre in enumerate(["", "bi", "tri"]):
  torch.library.impl(f"aten::upsample_{pre}linear{i+1}d", "privateuseone")(functools.partial(upsample, mode="linear"))
  torch.library.impl(f"aten::upsample_nearest{i+1}d", "privateuseone")(functools.partial(upsample, mode="nearest"))
  torch.library.impl(f"aten::_upsample_nearest_exact{i+1}d", "privateuseone")(functools.partial(upsample, mode="nearest-exact"))

-@torch.library.impl("aten::scatter_add.out", "privateuseone")
-def scatter_add(self, dim, index, src, out):
-  self, index, src, out_unwrapped = unwrap(self), unwrap(index), unwrap(src), unwrap(out)
-  if self.shape == (): _apply_inplace(out_unwrapped, src)
-  else: _apply_inplace(out_unwrapped, Tensor.scatter_reduce(self, dim, index, src, reduce='sum'))
-  return out
-
 def _copy_between_devices(src, dest, cast_dtype, to_device, non_blocking=False):
  if src.is_tiny and dest.is_tiny:
    src_t, dest_t = unwrap(src), unwrap(dest)
@@ -404,15 +345,11 @@ def sort_values(input, dim=-1, descending=False, stable=True, values=None, indic
  _apply_inplace(unwrap(indices), out_indices.cast(dtypes.int64))
  return values, indices

-@torch.library.impl("aten::_linalg_svd", "privateuseone")
-def _linalg_svd(self, full_matrices=False):
-  U, S, Vh = unwrap(self).svd(full_matrices)
-  return wrap(U), wrap(S), wrap(Vh)
-
 # register some decompositions
 from torch._decomp import get_decompositions
 decomps = [
  aten.native_layer_norm_backward,
+  aten.native_group_norm_backward,
  aten.linalg_cross,
  aten.addmm,
  aten.addcmul,
@@ -447,12 +384,20 @@ decomps = [
  aten._softmax_backward_data, aten.embedding_dense_backward,
  aten.linalg_vector_norm,
  aten.binary_cross_entropy, aten.binary_cross_entropy_backward,
+  # the C++ mse/smooth_l1 kernels resize their out tensor, and a tiny tensor has no storage to resize
+  aten.mse_loss, aten.mse_loss_backward,
+  aten.smooth_l1_loss, aten.smooth_l1_loss_backward,
  aten.upsample_nearest2d.out,
+  # NOTE: only the "out" overload, the "vec" one is CompositeImplicitAutograd and overriding it loses the autograd kernel
+  aten.upsample_bicubic2d.out,
+  aten._adaptive_avg_pool2d,
  # activations
  aten.hardswish, aten.hardswish_backward,
  aten.hardtanh, aten.hardtanh_backward,
  aten.gelu, aten.gelu_backward,
-  aten.logical_and,
+  # NOTE: no aten.logical_or here, its decomposition reaches aten.bitwise_or through a path that checks aliasing by
+  # reading storage, which a tiny tensor has none of. it gets a direct impl below instead
+  aten.logical_and, aten.logical_xor,
  aten.randint,
  aten.eye,
  aten.hardsigmoid_backward,
@@ -495,7 +440,7 @@ simple_tensor_methods = [
  # reduce
  "all", "any", "argmax", "argmin", "cumsum", "cumprod",
  # complex
-  "avg_pool2d", "linspace"]
+  "linspace"]

 tiny_backend_out = {**{f"aten.{x}.out":getattr(Tensor,x) for x in simple_tensor_methods}, **{
  "aten.add.out": lambda input,other,alpha=1: input+alpha*other,
@@ -540,6 +485,8 @@ tiny_backend_out = {**{f"aten.{x}.out":getattr(Tensor,x) for x in simple_tensor_
  "aten.where.self_out": Tensor.where,
  "aten.prod.int_out": Tensor.prod,
  "aten.scatter.src_out": Tensor.scatter,
+  "aten.scatter_add.out": lambda self,dim,index,src: src if self.shape == () else Tensor.scatter_reduce(self, dim, index, src, reduce="sum"),
+  "aten.isin.Tensor_Tensor_out": lambda x,y,assume_unique=False,invert=False: (x.unsqueeze(-1)==y.flatten()).any(-1) != invert,
  # NOTE: axis=[] in torch means all, change tinygrad?
  "aten.sum.IntList_out": lambda self,axis,keepdim=False,dtype=None:
    self.sum(axis if axis is None or len(axis) else None, keepdim,
@@ -555,10 +502,9 @@ def wrap_out(f):
    assert out.shape == assigned.shape, f"shape mismatch: {assigned.shape} -> {out.shape}"
    assert out.device == assigned.device or out.device is None or assigned.device is None, f"device mismatch: {assigned.device} -> {out.device}"
    assert out.dtype == assigned.dtype, f"dtype mismatch: {assigned.dtype} -> {out.dtype}"
-    # an out= that is a view has to be written through its base, and _apply_inplace gives a deviceless base its buffer first
-    if canonical_base(out) is not out: return _apply_inplace(out, assigned) or out
-    if out.device is None and assigned.device is not None: out.replace(out.empty_like(device=assigned.device))
-    return out.assign(assigned)
+    # writing out= is an in-place write like any other: through the base if it is a view, refreshing any derived views
+    _apply_inplace(out, assigned)
+    return out
  return _wrap_out

 def _inplace_op(t, new_value):
@@ -566,7 +512,14 @@ def _inplace_op(t, new_value):
  else: _apply_inplace(t, new_value)
  return t

-tiny_backend = {**{k:wrap_out(v) for k,v in tiny_backend_out.items()}, **{
+# the three arange overloads are one function at different arity, and dtype/layout/device/pin_memory are keyword only in all of them
+def _arange(*args, dtype=None, **_):
+  return Tensor.arange(*args, dtype=_from_torch_dtype(dtype or (torch.get_default_dtype() if any(isinstance(x, float) for x in args) else torch.int64)))
+
+def _empty(size, dtype=None, device=None, **_):
+  return Tensor.empty(*size, dtype=_from_torch_dtype(dtype or torch.get_default_dtype()), device=_from_torch_device(device))
+
+tiny_backend = {**tiny_backend_out, **{
  "aten.remainder.Scalar_Tensor": lambda x,y: x%y,
  "aten.floor_divide": lambda x,y: x//y,
  "aten.floor_divide_.Tensor": lambda x,y: x//y,
@@ -579,8 +532,8 @@ tiny_backend = {**{k:wrap_out(v) for k,v in tiny_backend_out.items()}, **{
  # inplace ops using replace for fusion
  "aten.zero_": lambda x: x.const_like(0),
  "aten.fill_.Scalar": lambda x, y: x.const_like(y),
-  "aten.add_.Tensor": lambda self, other, alpha=1.0: self + other * alpha,
-  "aten.add_.Scalar": lambda self, other, alpha=1.0: self + other * alpha,
+  "aten.add_.Tensor": lambda self, other, alpha=1: self + other * alpha,
+  "aten.add_.Scalar": lambda self, other, alpha=1: self + other * alpha,
  "aten.mul_.Tensor": lambda self, other: self * other,
  "aten.mul_.Scalar": lambda self, other: self * other,
  # relu doesn't have an out form?
@@ -613,7 +566,9 @@ tiny_backend = {**{k:wrap_out(v) for k,v in tiny_backend_out.items()}, **{
  # these don't work in out form, they have size 0
  "aten.abs": Tensor.abs,
  "aten.logical_not": Tensor.logical_not,
-  "aten.logical_or_": lambda x, y: x | y,
+  # compare against zero first: logical_* is bool-valued for any input dtype, while | is bitwise
+  "aten.logical_or": lambda x, y: (x != 0) | (y != 0),
+  "aten.logical_or_": lambda x, y: (x != 0) | (y != 0),
  "aten.multinomial": Tensor.multinomial,
  "aten.masked_fill_.Scalar": lambda self, mask, value: self.masked_fill(mask, value),
  "aten.masked_fill_.Tensor": lambda self, mask, value: self.masked_fill(mask, value),
@@ -622,14 +577,7 @@ tiny_backend = {**{k:wrap_out(v) for k,v in tiny_backend_out.items()}, **{
  "aten.masked_select": Tensor.masked_select,
  "aten.all": Tensor.all,
  "aten.sgn": Tensor.sign,
-  "aten.acos": Tensor.acos,
  "aten.any": Tensor.any,
-  "aten.bitwise_not": Tensor.bitwise_not,
-  "aten.argmax": Tensor.argmax,
-  "aten.argmin": Tensor.argmin,
-  "aten.asinh": Tensor.asinh,
-  "aten.mul": Tensor.mul,
-  "aten.atanh": Tensor.atanh,
  "aten.fill_.Tensor": lambda self, value: self.const_like(value.reshape(()).item()),
  "aten.flip": Tensor.flip,
  "aten.scatter_reduce.two": Tensor.scatter_reduce,
@@ -640,10 +588,22 @@ tiny_backend = {**{k:wrap_out(v) for k,v in tiny_backend_out.items()}, **{
  "aten.add.Tensor": lambda input,other,alpha=1: input+alpha*other,
  "aten.linspace": lambda start, stop, steps, dtype=None, **kwargs:
    Tensor.linspace(start, stop, steps, **({"dtype": _from_torch_dtype(dtype)} if dtype is not None else {})),
+  # the functional copy_. without an impl the fallback segfaults on a tensor with no storage
+  "aten.copy": lambda self,src,non_blocking=False: src.cast(self.dtype).to(self.device).expand(self.shape),
+  "aten.arange": lambda end, **kwargs: _arange(0, end, **kwargs),
+  "aten.arange.start": _arange,
+  "aten.arange.start_step": _arange,
+  # empty_strided takes the strides and drops them: we always allocate contiguous
+  "aten.empty_strided": lambda size, stride, **kwargs: _empty(size, **kwargs),
+  "aten.empty.memory_format": _empty,
+  # TODO: supprt stride [] in tinygrad?
+  "aten.max_pool2d_with_indices": lambda self,kernel_size,stride=None,padding=0,dilation=1,ceil_mode=False: ((r:=Tensor.max_pool2d(self, kernel_size, stride or None, dilation, padding, ceil_mode, return_indices=True))[0], r[1].cast(dtypes.int64)),
+  "aten.max_pool2d_with_indices_backward": lambda grad_out,self,kernel_size,stride=None,padding=0,dilation=1,ceil_mode=False,indices=None: Tensor.max_unpool2d(grad_out, indices, output_size=self.shape),
+  "aten.max_unpool2d": lambda self,indices,output_size: Tensor.max_unpool2d(self, indices, output_size=output_size),
+  "aten._linalg_svd": lambda self,full_matrices=False: Tensor.svd(self, full_matrices),
  "aten.topk": Tensor.topk,
  "aten.constant_pad_nd": lambda self, padding, value=0.0: self.pad(padding, mode="constant", value=value).contiguous(),
-  # TODO: input contiguous is needed to prevent CFGContext circular dependency assertion for shapes >512 (see test_cumsum_arange_large)
-  "aten.cumsum": lambda self, dim: self.contiguous().cumsum(dim),
+  "aten.cumsum": lambda self, dim: self.cumsum(dim),
  "aten.logsumexp": lambda self, axis, keepdim=False: self.logsumexp(axis[0], keepdim=keepdim),
  "aten.roll": Tensor.roll,
  "aten.logcumsumexp": Tensor.logcumsumexp,
@@ -652,6 +612,7 @@ tiny_backend = {**{k:wrap_out(v) for k,v in tiny_backend_out.items()}, **{
    self.ones_like(**{k: v for k, v in {"dtype": _from_torch_dtype(dtype) if dtype else None,
                                        "device": _from_torch_device(device) if device else None}.items() if v is not None}),
  "aten.max.dim": lambda self, dim, keepdim=False: (self.max(dim, keepdim), self.argmax(dim, keepdim).cast(dtype=dtypes.int64)),
+  "aten.min.dim": lambda self, dim, keepdim=False: (self.min(dim, keepdim), self.argmin(dim, keepdim).cast(dtype=dtypes.int64)),
  "aten.cummax": lambda self, dim: ((r := self.cummax(dim))[0], r[1].cast(dtypes.int64)),
  "aten.cummin": lambda self, dim: ((r := self.cummin(dim))[0], r[1].cast(dtypes.int64)),
  "aten.nonzero": Tensor.nonzero,
@@ -713,15 +674,16 @@ def wrap_inplace_view_op(f):
  return nf

 # the aten schema says how an op is called: an inplace view retargets the view, a writable first arg is inplace,
-# and a writable out arg must have come from tiny_backend_out so that wrap_out was applied
+# and a writable out arg gets wrap_out's dtype cast, shape assert, and view write-through
 for k,v in tiny_backend.items():
  name, _, overload = k.removeprefix("aten.").partition(".")
  op = getattr(getattr(aten, name), overload or "default")
  writes = [a.name for a in op._schema.arguments if a.alias_info is not None and a.alias_info.is_write]
  if torch.Tag.inplace_view in op.tags: fxn = wrap_inplace_view_op(v)
  elif writes == [op._schema.arguments[0].name] and op._schema.returns: fxn = wrap_inplace(v)
-  elif not writes or (writes == ["out"] and k in tiny_backend_out): fxn = wrap_fxn(k, v)
-  else: raise RuntimeError(f"{k} writes {writes}: expected an inplace first arg, or an out arg with {k} in tiny_backend_out")
+  elif not writes: fxn = wrap_fxn(k, v)
+  elif writes == ["out"]: fxn = wrap_fxn(k, wrap_out(v))
+  else: raise RuntimeError(f"{k} writes {writes}: unhandled writable arg in schema")
  torch.library.impl(k.replace("aten.", "aten::"), "privateuseone")(fxn)

@torch.library.impl("aten::equal", "privateuseone")
@@ -83,6 +83,12 @@ class TestTorchBackend(unittest.TestCase):
    torch.add(torch.ones(5, device=device), torch.ones(5, device=device), out=a)
    self.assertEqual(a.detach().storage_offset(), 3)

+  def test_out_refreshes_views_of_base(self):
+    a = torch.zeros(4, device=device)
+    v = a[2:]
+    torch.add(torch.ones(4, device=device), torch.ones(4, device=device), out=a)
+    np.testing.assert_equal(v.cpu().numpy(), [2., 2.])
+
  @unittest.expectedFailure  # TODO: storage offset assumes a contiguous source, use UOp.contiguous_view_offset
  def test_storage_offset_non_contiguous_source(self):
    a = torch.arange(12., device=device).reshape(3,4)
@@ -166,6 +172,15 @@ class TestTorchBackend(unittest.TestCase):
    expected = np.array([[1.5, 5.2, 9.0], [13.2, 17.1, 18.4]], dtype=np.float32)
    np.testing.assert_equal(y3.cpu().numpy(), expected)

+  def test_argmax_argmin(self):
+    a = torch.arange(12, dtype=torch.float32, device=device).reshape(3, 4)
+    c = a.cpu()
+    for got, want in [(a.argmax(), c.argmax()), (a.argmin(0), c.argmin(0)), (a.argmax(1, keepdim=True), c.argmax(1, keepdim=True)),
+                      (torch.min(a, 1).indices, torch.min(c, 1).indices), (torch.max(a, 1).indices, torch.max(c, 1).indices),
+                      (torch.min(a, 1).values, torch.min(c, 1).values), (torch.min(a, 1, keepdim=True).indices, torch.min(c, 1, keepdim=True).indices)]:
+      self.assertEqual(got.dtype, want.dtype)  # torch's arg reduces are int64, tinygrad's are int32
+      np.testing.assert_equal(got.cpu().numpy(), want.numpy())
+
  def test_isfinite(self):
    a = torch.ones(4, device=device)
    np.testing.assert_equal(torch.isfinite(a).cpu().numpy(), [True, True, True, True])
@@ -373,6 +388,22 @@ class TestTorchBackend(unittest.TestCase):
    for bwd_eps in [1e-5, 0.3]:
      for got, want in zip(run(device, bwd_eps), run("cpu", bwd_eps)): np.testing.assert_allclose(got, want, atol=1e-4, rtol=1e-3)

+  def test_groupnorm_backward(self):
+    def run(dev):
+      x = torch.arange(24., device=dev).reshape(2, 4, 3).requires_grad_()
+      w = torch.linspace(0.5, 2.0, 4).to(dev).requires_grad_()
+      torch.nn.functional.group_norm(x, 2, w, torch.zeros(4, device=dev)).square().sum().backward()
+      return x.grad.cpu().numpy(), w.grad.cpu().numpy()
+    for got, want in zip(run(device), run("cpu")): np.testing.assert_allclose(got, want, atol=1e-4, rtol=1e-3)
+
+  def test_mse_smooth_l1_loss_backward(self):
+    def run(dev, loss):
+      x = torch.arange(4., device=dev).requires_grad_()
+      loss(x, torch.ones(4, device=dev)).backward()
+      return x.grad.cpu().numpy()
+    for loss in [torch.nn.functional.mse_loss, torch.nn.functional.smooth_l1_loss]:
+      np.testing.assert_allclose(run(device, loss), run("cpu", loss), atol=1e-6)
+
  def test_batchnorm_unsqueeze(self):
    bn = torch.nn.BatchNorm2d(4).to(device)
    x = torch.randn(8, 4, 3, 3, device=device)
@@ -516,6 +547,15 @@ class TestTorchBackend(unittest.TestCase):
    cpu_res = torch.arange(20, dtype=torch.float32)[::2][1:4].numpy()
    np.testing.assert_equal(torch_res, cpu_res)

+  def test_select_out_of_range_dim(self):
+    a = torch.arange(12, dtype=torch.int32, device=device).reshape(3, 4)
+    with self.assertRaises(IndexError): a.select(5, 0)
+
+  def test_select_collapses_the_only_dim(self):
+    a = torch.arange(3, dtype=torch.int32, device=device)
+    self.assertEqual(a.select(0, 1).shape, ())
+    np.testing.assert_equal(a.select(0, 1).cpu().numpy(), 1)
+
  def test_slice_negative_dim(self):
    a = torch.arange(13, dtype=torch.int32, device=device).repeat(8, 1)
    torch_chunks = a.chunk(3, -1)
@@ -796,6 +836,86 @@ class TestTorchBackend(unittest.TestCase):
    np.testing.assert_allclose(w_tiny.grad.cpu().numpy(), w_cpu.grad.numpy(), atol=1e-4, rtol=1e-3)
    np.testing.assert_allclose(b_tiny.grad.cpu().numpy(), b_cpu.grad.numpy(), atol=1e-4, rtol=1e-3)

+  def test_write_through_detach_of_unrealized(self):
+    a = torch.empty(4, device=device)
+    a.detach().fill_(3)
+    np.testing.assert_equal(a.cpu().numpy(), [3, 3, 3, 3])
+
+  def test_square_transpose_inplace(self):
+    # a same-shape transpose is not a reshape: writing the transposed values straight back would scramble the base
+    a = torch.tensor([[0., 1., 2.], [3., 4., 5.], [6., 7., 8.]], device=device)
+    a.transpose(0, 1).add_(100)
+    np.testing.assert_equal(a.cpu().numpy(), [[100., 101., 102.], [103., 104., 105.], [106., 107., 108.]])
+
+  def test_interpolate(self):
+    a = torch.arange(4, dtype=torch.float32, device=device).reshape(1, 1, 2, 2)
+    nearest = torch.nn.functional.interpolate(a, scale_factor=2.0)
+    np.testing.assert_equal(nearest.cpu().numpy()[0, 0], [[0, 0, 1, 1], [0, 0, 1, 1], [2, 2, 3, 3], [2, 2, 3, 3]])
+    linear = torch.nn.functional.interpolate(a, size=(4, 4), mode="bilinear", align_corners=False)
+    ref = torch.nn.functional.interpolate(a.cpu(), size=(4, 4), mode="bilinear", align_corners=False)
+    np.testing.assert_allclose(linear.cpu().numpy(), ref.numpy(), rtol=1e-5)
+
+  def test_interpolate_bicubic_area(self):
+    a = torch.arange(32, dtype=torch.float32, device=device).reshape(1, 2, 4, 4)
+    for mode, scale in [("bicubic", 2.0), ("area", 0.5)]:
+      ref = torch.nn.functional.interpolate(a.cpu(), scale_factor=scale, mode=mode)
+      np.testing.assert_allclose(torch.nn.functional.interpolate(a, scale_factor=scale, mode=mode).cpu().numpy(), ref.numpy(), atol=1e-4)
+
+  @unittest.expectedFailure
+  def test_interpolate_bicubic_backward(self):
+    # the forward comes from a decomposition, but aten::upsample_bicubic2d_backward has none (nor does
+    # aten::_adaptive_avg_pool2d_backward, for area), so training through these modes needs a real kernel
+    x = torch.arange(32., dtype=torch.float32, device=device).reshape(1, 2, 4, 4).requires_grad_()
+    torch.nn.functional.interpolate(x, scale_factor=2.0, mode="bicubic").sum().backward()
+
+  @unittest.expectedFailure
+  def test_interpolate_inexact_scale(self):
+    # torch forwards the raw scale_factor, Tensor.interpolate recomputes it from output_size, and they disagree here
+    a = torch.arange(6, dtype=torch.float32, device=device).reshape(1, 1, 2, 3)
+    tiny = torch.nn.functional.interpolate(a, scale_factor=2.5, mode="bilinear")
+    ref = torch.nn.functional.interpolate(a.cpu(), scale_factor=2.5, mode="bilinear")
+    np.testing.assert_allclose(tiny.cpu().numpy(), ref.numpy(), rtol=1e-5)
+
+  def test_logical_or_xor(self):
+    a = torch.tensor([True, True, False, False], device=device)
+    b = torch.tensor([True, False, True, False], device=device)
+    np.testing.assert_equal(torch.logical_or(a, b).cpu().numpy(), [True, True, True, False])
+    np.testing.assert_equal(torch.logical_xor(a, b).cpu().numpy(), [False, True, True, False])
+    # bool-valued whatever the input dtype, so this is not | and ^
+    i, j = torch.tensor([2, 0, 5, 0], device=device), torch.tensor([0, 0, 1, 1], device=device)
+    np.testing.assert_equal(torch.logical_or(i, j).cpu().numpy(), [True, False, True, True])
+    np.testing.assert_equal(torch.logical_xor(i, j).cpu().numpy(), [True, False, False, True])
+
+  def test_slice_scatter(self):
+    # the scatters are functional: they return a new tensor and must leave the one they were given alone
+    a = torch.arange(12, dtype=torch.float32, device=device).reshape(3, 4)
+    out = torch.slice_scatter(a, torch.ones(1, 4, device=device), 0, 0, 1)
+    np.testing.assert_equal(out.cpu().numpy(), [[1, 1, 1, 1], [4, 5, 6, 7], [8, 9, 10, 11]])
+    np.testing.assert_equal(a.cpu().numpy(), np.arange(12, dtype=np.float32).reshape(3, 4))
+
+  def test_slice_scatter_casts_src(self):
+    a = torch.zeros(3, 4, device=device)
+    out = torch.slice_scatter(a, torch.ones(1, 4, dtype=torch.int32, device=device), 0, 0, 1)
+    self.assertEqual(out.dtype, torch.float32)
+    np.testing.assert_equal(out.cpu().numpy()[0], np.ones(4, dtype=np.float32))
+
+  def test_select_scatter(self):
+    a = torch.arange(12, dtype=torch.float32, device=device).reshape(3, 4)
+    out = torch.select_scatter(a, torch.ones(4, device=device), 0, 1)
+    np.testing.assert_equal(out.cpu().numpy(), [[0, 1, 2, 3], [1, 1, 1, 1], [8, 9, 10, 11]])
+
+  def test_diagonal_scatter(self):
+    a = torch.zeros(3, 3, device=device)
+    out = torch.diagonal_scatter(a, torch.arange(3, dtype=torch.float32, device=device))
+    np.testing.assert_equal(out.cpu().numpy(), np.diag([0., 1., 2.]))
+    np.testing.assert_equal(a.cpu().numpy(), np.zeros((3, 3), dtype=np.float32))
+
+  def test_copy_functional(self):
+    # without an impl this segfaults rather than fails: a regression here takes the whole run down
+    a = torch.arange(4, dtype=torch.float32, device=device)
+    out = torch.ops.aten.copy(a, torch.zeros(4, device=device))
+    np.testing.assert_equal(out.cpu().numpy(), [0., 0., 0., 0.])
+    np.testing.assert_equal(a.cpu().numpy(), [0., 1., 2., 3.])

 from tinygrad import Tensor
 class TestBackendHelpers(unittest.TestCase):
@@ -1,6 +1,6 @@
 [project]
 name = "tinygrad"
-version = "0.13.0"
+version = "0.14.0"
 description = "You like pytorch? You like micrograd? You love tinygrad! <3"
 authors = [{ name = "George Hotz" }]

@@ -84,7 +84,7 @@ testing = [
  "pillow",
  "onnx==1.19.0",
  "onnx2torch",
-  "onnxruntime",
+  "onnxruntime==1.24.1",
  "opencv-python",
  "transformers",
  "sentencepiece",
@@ -111,6 +111,10 @@ docs = [
  "numpy",
 ]
 mesa = ["tinymesa==25.2.7.2"]
+autogen = [
+  "pyyaml",
+  "mako",
+]


 [tool.mutmut]
@@ -23,7 +23,6 @@
 \definecolor{axblue}{HTML}{1565C0}       % GLOBAL
 \definecolor{axcyan}{HTML}{00838F}       % LOCAL
 \definecolor{axbrcyan}{HTML}{00ACC1}     % WARP
-\definecolor{axbrblue}{HTML}{42A5F5}     % THREAD
 \definecolor{axwhite}{HTML}{616161}      % LOOP (gray on white paper)
 \definecolor{axred}{HTML}{C62828}        % REDUCE
 \definecolor{axbrred}{HTML}{E53935}      % GROUP_REDUCE
@@ -50,10 +49,10 @@ All nodes in the tinygrad graph are \textbf{UOps}. A UOp is a tuple $(\mathrm{op
 \toprule
 \textbf{Op} & \textbf{src} & \textbf{arg} & \textbf{Semantics} \\
 \midrule
-\op{Param} & $(\mathbf{s})$ & slot, dtype, device?, addrspace? &
-  Placeholder with shape $\mathbf{s}$. Substituted in \op{Function}. \\[4pt]
-\op{Buffer} & $(\mathbf{s})$ & slot, dtype, device, addrspace &
-  Concrete buffer slot with shape $\mathbf{s}$. If device is a tuple, it creates the fully sized buffer across multiple devices. \\
+\op{Param} & () & \texttt{ParamArg} &
+  Placeholder with flat storage of $\mathrm{size}$ elements. Substituted in \op{Call}. \\[4pt]
+\op{Buffer} & () & \texttt{ParamArg} &
+  Flat storage of $\mathrm{size}$ elements. \textbf{Unbound} if not allocated yet. \\
 \op{Const} & () & value, dtype &
  A scalar constant with shape $(\ )$. \\
  & & & Form vector consts with \op{Stack} \\
@@ -62,7 +61,21 @@ All nodes in the tinygrad graph are \textbf{UOps}. A UOp is a tuple $(\mathrm{op
 \end{tabular}

 \smallskip
-\textbf{addrspace} is \texttt{GLOBAL}, \texttt{LOCAL}, or \texttt{REG}.
+\texttt{ParamArg} contains slot, dtype, concrete size (or \textsc{null} for a scalar), value bounds, alignment, name, addrspace, device, volatility, optional image shape, and an optional bound device buffer (absent for unbound \op{Buffer}s). \textbf{addrspace} is \texttt{GLOBAL}, \texttt{LOCAL}, or \texttt{REG}.
+
+%% ============================================================
+\subsection*{{\color{callblue}Call Ops} \normalfont\small--- function abstraction, like the lambda calculus}
+
+\begin{tabular}{@{}l l l l@{}}
+\toprule
+\textbf{Op} & \textbf{src} & \textbf{arg} & \textbf{Semantics} \\
+\midrule
+\op{Call} & (body, $a_0$, $a_1$, \ldots) & --- & Substitute each \op{Param} $k$ in body with $a_k$. \\
+\bottomrule
+\end{tabular}
+
+\smallskip
+A value \op{Call} is void: its \op{Sink} body stores to output \op{Param}s bound positionally to the call's unbound \op{Buffer} arguments; output $a_k$ is \op{After}$(a_k, \op{Call})$. Unbound \op{Buffer}s are scoped to their \op{Call}: they are never implicit inputs of the enclosing graph.

 %% ============================================================
 \subsection*{{\color{movgreen}Movement Ops} \normalfont\small--- no arithmetic; view, indexing, and reinterpretation only}
@@ -95,20 +108,6 @@ All nodes in the tinygrad graph are \textbf{UOps}. A UOp is a tuple $(\mathrm{op
 \bottomrule
 \end{tabular}

-%% ============================================================
-\subsection*{{\color{callblue}Call Ops} \normalfont\small--- function abstraction, like the lambda calculus}
-
-\begin{tabular}{@{}l l l l@{}}
-\toprule
-\textbf{Op} & \textbf{src} & \textbf{arg} & \textbf{Semantics} \\
-\midrule
-\op{Function} & (body, $a_0$, $a_1$, \ldots) & --- & Substitute each \op{Param} $k$ in \op{Tuple} body with $a_k$. Gradient-able. \\
-\op{Call} & (body, $a_0$, $a_1$, \ldots) & --- & Opaque invocation of a compiled kernel or custom function. \\
-\op{Tuple} & $(v_0, v_1, \ldots)$ & --- & Pack values; required as \op{Function} body to return a value. \\
-\op{GetTuple} & $(T,)$ & idx & Extract element at idx from a \op{Tuple}. \\
-\bottomrule
-\end{tabular}
-
 %% ============================================================
 \subsection*{{\color{loadred}Load Ops} \normalfont\small--- can change device or addrspace}

@@ -256,9 +255,9 @@ Every UOp has a \textbf{dtype}, \textbf{shape}, \textbf{device}, \textbf{addrspa
 \toprule
 \textbf{Op} & \textbf{dtype} & \textbf{shape} & \textbf{device} & \textbf{min\_max} \\
 \midrule
-\op{Buffer} & from arg & from $\mathrm{src}[0]$ & from arg & dtype range \\
+\op{Buffer} & from arg & from arg ($\mathrm{size}$) & from arg & dtype range \\
 \op{Const} & from arg & $()$ & \textsc{null} & $[v, v]$ \\
-\op{Param} & from arg & from $\mathrm{src}[0]$ & from arg & from src or dtype range \\[3pt]
+\op{Param} & from arg & from arg ($\mathrm{size}$) & from arg & from src or dtype range \\[3pt]
 Movement ops & $\mathrm{src}[0].\mathrm{dtype}$ & (see op) & $\mathrm{src}[0].\mathrm{device}$ & $\mathrm{src}[0]$ \\
 \op{Unshard} & $\mathrm{src}[0].\mathrm{dtype}$ & $\mathrm{src}[0]$, each $a_k \times n_k$ & $\mathrm{src}[0].\mathrm{device}$ & $\mathrm{src}[0]$ \\
 \op{Reduce} & $\mathrm{src}[0].\mathrm{dtype}$ & remove first $n$ axes & $\mathrm{src}[0].\mathrm{device}$ & dtype range \\[3pt]
@@ -272,7 +271,7 @@ ALU unary & $\mathrm{src}[0].\mathrm{dtype}$ & $\mathrm{src}[0].\mathrm{shape}$
 Other binary & $\mathrm{src}[0].\mathrm{dtype}$ & broadcast & $\mathrm{src}[0].\mathrm{device}$ & dtype range \\
 \op{CmpLt}, \op{CmpNe} & bool & broadcast & $\mathrm{src}[0].\mathrm{device}$ & from intervals \\
 \op{Where} & $\mathrm{src}[1].\mathrm{dtype}$ & broadcast & $\mathrm{src}[0].\mathrm{device}$ & $[\min(b,c),\, \max(B,C)]$ \\[3pt]
-\op{Function}, \op{Call} & $\mathrm{src}[0].\mathrm{dtype}$ & substitute \op{Param} shapes & $\mathrm{src}[1].\mathrm{device}$ & dtype range \\
+\op{Call} & void & --- & first non-null src device & --- \\
 \op{Range} & index & $()$ & \textsc{null} & $[0,\, n{-}1]$ \\
 \op{Index} & $\mathrm{src}[0].\mathrm{dtype}$ & remaining dims & $\mathrm{src}[0].\mathrm{device}$ & $\mathrm{src}[0]$ \\
 \op{Store} & void & $()$ & $\mathrm{src}[0].\mathrm{device}$ & --- \\
@@ -304,7 +303,6 @@ Each kernel's iteration space is a set of \op{Range} axes. Every range has an \t
 {\color{axblue}\texttt{GLOBAL}} & \texttt{g} & --- & --- & GPU global workgroup dimension. \\
 {\color{axcyan}\texttt{LOCAL}} & \texttt{l} & g, L & inner & Workgroup local dimension (shared memory). \\
 {\color{axbrcyan}\texttt{WARP}} & \texttt{w} & \multicolumn{2}{l}{(created by \op{TC})} & Warp-level lanes for tensor cores. \\
-{\color{axbrblue}\texttt{THREAD}} & \texttt{t} & g & outer & CPU thread parallelism. \\
 {\color{axwhite}\texttt{LOOP}} & \texttt{L} & --- & --- & Generic sequential loop (initial state). \\
 {\color{axred}\texttt{REDUCE}} & \texttt{R} & --- & --- & Reduction axis. \\
 {\color{axbrred}\texttt{GROUP\_REDUCE}} & \texttt{G} & R & inner/outer & Shared-memory group reduction. \\
@@ -327,8 +325,6 @@ An optimization is a triple $(\mathrm{op},\;\mathrm{axis},\;\mathrm{arg})$:
  Pad axis to next multiple of $m$ with validity masks. \\[4pt]
 \op{Swap} & axis$_i$ & axis$_j$ &
  Swap two axes $i \leftrightarrow j$. \\
-\op{Nolocals} & --- & --- &
-  Disable local memory; no workgroup dims emitted. \\
 \op{TC} & reduce idx & (tc, opt, mode) &
  Apply tensor core \op{Wmma}: split reduce/output axes into \texttt{WARP}, \texttt{UPCAST}, and \texttt{UNROLL} dims. \\
 \bottomrule
@@ -421,7 +417,7 @@ def allreduce(T):
 %% ============================================================
 \subsection*{{\color{callblue}The \texttt{@function} Decorator} \normalfont\small--- graph capture via tracing}

-The \texttt{@function} decorator transforms a Python function on Tensors into a single \op{Function} node.
+The \texttt{@function} decorator transforms a Python function on Tensors into a single \op{Call} node.

 \begin{lstlisting}
@function
@@ -433,14 +429,15 @@ When \texttt{f(x, y)} is called, the decorator:

 \begin{enumerate}[leftmargin=1.5em, itemsep=2pt]
  \item \textbf{Extracts inputs}: walks all arguments to find every Tensor, deduplicates by identity.
-  \item \textbf{Runs the function} lazily (no device execution), building a UOp graph from the result.
-  \item \textbf{Parameterizes}: replaces each input UOp with a \op{Param}$(k)$ placeholder.
-  \item \textbf{Wraps the body} in a \op{Tuple} (even for single returns) and creates\\
-        \op{Function}(\op{Tuple}(body), $x$, $y$).
-  \item \textbf{Returns} the result via \op{GetTuple}$(0)$, or one \op{GetTuple} per element for tuple returns.
+  \item \textbf{Runs the function} lazily (no device execution), building a UOp graph from each returned value.
+  \item \textbf{Parameterizes inputs}: replaces each input UOp with a positional \op{Param}$(k)$ placeholder.
+  \item \textbf{Parameterizes outputs}: for each returned value $v_i$, creates an output \op{Param}$(m+i)$ and a matching unbound \op{Buffer} $b_i$ (unique identity), where $m$ is the number of inputs.
+  \item \textbf{Builds the call}: stores every $v_i$ into its output parameter and creates\\
+        \op{Call}(\op{Sink}(\op{Store}(\op{Param}$(m)$, $v_0$), \ldots), $x$, $y$, $b_0$, \ldots).
+  \item \textbf{Returns values}: exposes each result as \op{After}($b_i$, \op{Call}).
 \end{enumerate}

-The result is a reusable graph fragment: the body contains only \op{Param} references, not concrete buffers. At schedule time, the \op{Function} is resolved by substituting each \op{Param}$(k)$ back with its corresponding argument $a_k$, or lowered into an opaque \op{Call} if it is to be compiled as a reusable kernel.
+The result is a reusable graph fragment: the body contains only \op{Param} references, not concrete buffers, and a single call can return any number of values. At schedule time, an ordinary value-producing \op{Call} is inlined by positional \op{Param} substitution and each output \op{After} resolves to the value stored in the body. A precompiled call instead materializes real output buffers in place of the unbound \op{Buffer}s and lowers the body to an opaque call that writes them.

 %% ============================================================
 \subsection*{Lowering Pipeline \normalfont\small--- from Tensor graph to machine code}
--- a/Show More
+++ b/Show More