[ExecuTorch][WebGPU] et_vk.sdpa channel-attention tests

[JCNTH]

Stack from ghstack (oldest at bottom):

• [ExecuTorch][WebGPU] split_with_sizes_copy op tests #20996
• [ExecuTorch][WebGPU] Add split_with_sizes_copy op #20995
• [ExecuTorch][WebGPU] batch_norm op tests #20994
• [ExecuTorch][WebGPU] Add batch_norm op #20993
• [ExecuTorch][WebGPU] upsample_bilinear2d op tests #20992
• [ExecuTorch][WebGPU] Add upsample_bilinear2d op #20991
• [ExecuTorch][WebGPU] leaky_relu op tests #20990
• [ExecuTorch][WebGPU] Add leaky_relu op #20989
• [ExecuTorch][WebGPU] Tests for aten._to_copy.default int<->float convert #20988
• [ExecuTorch][WebGPU] Add aten._to_copy.default with int<->float numeric convert #20987
• [ExecuTorch][WebGPU] Tests for aten.sub.Tensor broadcast #20986
• [ExecuTorch][WebGPU] Add aten.sub.Tensor with TensorMeta broadcast #20985
• [ExecuTorch][WebGPU] apply_rotary_emb_hf op tests #20876
• [ExecuTorch][WebGPU] et_vk.apply_rotary_emb_hf: HuggingFace rotate-half RoPE runtime op (unblocks Qwen3) #20875
• [ExecuTorch][WebGPU] et_vk conv2d im2col-GEMM tests #20874
• [ExecuTorch][WebGPU] et_vk conv2d: route standard (groups==1) conv through an im2col tiled GEMM (1.1-2.4x) #20873
• -> [ExecuTorch][WebGPU] et_vk.sdpa channel-attention tests #20872
• [ExecuTorch][WebGPU] et_vk.sdpa: shape-route QK to a per-entry kernel for channel attention (15-30x faster) #20871
• [ExecuTorch][WebGPU] Migrate quantized_linear to make_compute_pipeline #20870
• [ExecuTorch][WebGPU] Migrate multi-dispatch ops to make_compute_pipeline #20869
• [ExecuTorch][WebGPU] Migrate 9 ops to make_compute_pipeline (layout:"auto") #20868
• [ExecuTorch][WebGPU] Adopt WebGPU layout:"auto" in make_compute_pipeline #20867
• [ExecuTorch][WebGPU] slice_copy native golden test #20866
• [ExecuTorch][WebGPU] slice_copy Double-arg scalar handling + view_copy/alias glue #20865
• [ExecuTorch][WebGPU] relu op tests #20864
• [ExecuTorch][WebGPU] Add relu op (shared unary handler; sigmoid adopts make_compute_pipeline) #20863
• [ExecuTorch][WebGPU] max_pool2d op tests #20862
• [ExecuTorch][WebGPU] Add max_pool2d op #20861
• [ExecuTorch][WebGPU] upsample_nearest2d op tests #20860
• [ExecuTorch][WebGPU] Add upsample_nearest2d op #20859
• [ExecuTorch][WebGPU] constant_pad_nd op tests #20858
• [ExecuTorch][WebGPU] Add constant_pad_nd op #20857
• [ExecuTorch][WebGPU] addmm op tests #20856
• [ExecuTorch][WebGPU] Add optimized addmm op #20855
• [ExecuTorch][WebGPU] embedding op tests #20854
• [ExecuTorch][WebGPU] Add embedding op #20853
• [ExecuTorch][WebGPU] SDPA op tests #20852
• [ExecuTorch][WebGPU] Add optimized SDPA op #20851
• [ExecuTorch][WebGPU] conv2d op tests #20850
• [ExecuTorch][WebGPU] Add optimized conv2d op #20849
• [ExecuTorch][WebGPU] linear_fp32 op tests #20848
• [ExecuTorch][WebGPU] Add optimized linear_fp32 op #20847
• [ExecuTorch][WebGPU] layer_norm op tests #20846
• [ExecuTorch][WebGPU] Add optimized layer_norm op #20845
• [ExecuTorch][WebGPU] gelu op tests #20844
• [ExecuTorch][WebGPU] Add optimized gelu op #20843
• [ExecuTorch][WebGPU] Shared pipeline + dispatch-grid + vec4-align helpers (op-suite foundation) #20842

Splits the channel-attention routing case out of the et_vk.sdpa per-entry-QK op diff into its own test diff, stacked directly above it (op below, tests above). Adds the chattn_davit case to the et_vk_sdpa suite in test/op_tests/cases.py, exercising the per-entry QK kernel path (num_rows below the per-row floor).

Co-authored-with: Claude Code.
@exported-using-ghexport

Differential Revision: D111072706

Differential Revision: D111072706

[pytorch-bot]

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• pull / test-models-linux-basic (vit, xnnpack-quantization-delegation, cmake, linux.arm64.2xlarge, execut... / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-moshi-linux / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-multimodal-linux (gemma3-4b) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-openvino-linux / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-parakeet-xnnpack-linux / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-phi-3-mini-runner-linux / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-qnn-buck-build-linux / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-qnn-delegate-linux / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-qnn-direct-build-linux / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-qnn-models-linux (dl3) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-qnn-models-linux (mv2) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-qnn-models-linux (mv3) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-qnn-passes-linux / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-qnn-python-imports-linux / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-qnn-testsuite-linux / test-backend-linux (qnn, operators) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-qnn-wheel-packages-linux (3.10) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-qnn-wheel-packages-linux (3.11) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-qnn-wheel-packages-linux (3.12) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-qnn-wheel-packages-linux (3.13) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-quantized-aot-lib-linux / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-samsung-models-linux / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-samsung-quantmodels-linux / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-selective-build-linux / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-setup-linux-gcc / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-sqnr-static-llm-qnn-linux (smollm2_135m) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-static-llama-qnn-linux (stories_110m) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-static-llama-qnn-linux (stories_260k_bc) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-voxtral-realtime-xnnpack-linux / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-vulkan-models-linux / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-vulkan-operators-linux / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / unittest / linux / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / unittest-buck / linux / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / unittest-editable / linux / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / unittest-nxp-neutron / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / unittest-wasm-bindings (--enable-etdump) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / unittest-wasm-bindings / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• Test ARM Backend / test-arm / test-backend-linux (arm_tosa_fp, models) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• Test ARM Backend / test-arm / test-backend-linux (arm_tosa_fp, operators) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• Test ARM Backend / test-arm / test-backend-linux (arm_vgf_fp, models) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• Test ARM Backend / test-arm / test-backend-linux (arm_vgf_fp, operators) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• Test QNN Backend / test-qnn / test-backend-linux (qnn, models) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• Test QNN Backend / test-qnn / test-backend-linux (qnn, operators) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• Test QNN Windows MSVC build / build-qnn-windows-msvc / windows-job (gh)
• Test Vulkan Backend / test-vulkan / test-backend-linux (vulkan, models) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• Test Vulkan Backend / test-vulkan / test-backend-linux (vulkan, operators) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• Test WebGPU Backend / test-webgpu / test-backend-linux (webgpu, models) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• Test WebGPU Backend / test-webgpu / test-backend-linux (webgpu, operators) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• Test XNNPACK Backend / test-xnnpack / test-backend-linux (xnnpack, models) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• Test XNNPACK Backend / test-xnnpack / test-backend-linux (xnnpack, operators) / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory

UNCLASSIFIED FAILURES - DrCI could not classify the following jobs because the workflow did not run on the merge base. The failures may be pre-existing on trunk or introduced by this PR:

• Build documentation / build (buck2) / Build doc (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
• periodic / test-models-linux (buck2, mv3, portable, linux.2xlarge, 90) / linux-job (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• periodic / test-models-linux (buck2, mv3, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• periodic / test-models-linux (cmake, mv3, portable, linux.2xlarge, 90) / linux-job (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• periodic / test-models-linux (cmake, mv3, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• periodic / test-models-linux (cmake, vit, portable, linux.2xlarge, 90) / linux-job (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• periodic / test-models-linux (cmake, vit, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• pull / unittest / windows / windows-job (gh) (matched win rule in flaky-rules.json)
  Can't find 'action.yml', 'action.yaml' or 'Dockerfile' under 'C:\actions-runner\_work\executorch\executorch\test-infra\.github\actions\teardown-windows'. Did you forget to run actions/checkout before running your local action?
• pull / unittest-editable / windows / windows-job (gh) (matched win rule in flaky-rules.json)
  Can't find 'action.yml', 'action.yaml' or 'Dockerfile' under 'C:\actions-runner\_work\executorch\executorch\test-infra\.github\actions\teardown-windows'. Did you forget to run actions/checkout before running your local action?

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-qnn-testsuite-linux / test-backend-linux (qnn, models) / linux-job (gh) (trunk failure)

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