From: Rob Clark robdclark@chromium.org
This picks up an earlier series[1] from Jordan, and adds additional support needed to generate GPU devcore dumps on iova faults. Original description:
This is a stack to add an Adreno GPU specific handler for pagefaults. The first patch starts by wiring up report_iommu_fault for arm-smmu. The next patch adds a adreno-smmu-priv function hook to capture a handful of important debugging registers such as TTBR0, CONTEXTIDR, FSYNR0 and others. This is used by the third patch to print more detailed information on page fault such as the TTBR0 for the pagetable that caused the fault and the source of the fault as determined by a combination of the FSYNR1 register and an internal GPU register.
This code provides a solid base that we can expand on later for even more extensive GPU side page fault debugging capabilities.
v5: [Rob] Use RBBM_STATUS3.SMMU_STALLED_ON_FAULT to detect case where GPU snapshotting needs to avoid crashdumper, and check the RBBM_STATUS3.SMMU_STALLED_ON_FAULT in GPU hang irq paths v4: [Rob] Add support to stall SMMU on fault, and let the GPU driver resume translation after it has had a chance to snapshot the GPUs state v3: Always clear FSR even if the target driver is going to handle resume v2: Fix comment wording and function pointer check per Rob Clark
[1] https://lore.kernel.org/dri-devel/20210225175135.91922-1-jcrouse@codeaurora....
Jordan Crouse (3): iommu/arm-smmu: Add support for driver IOMMU fault handlers iommu/arm-smmu-qcom: Add an adreno-smmu-priv callback to get pagefault info drm/msm: Improve the a6xx page fault handler
Rob Clark (2): iommu/arm-smmu-qcom: Add stall support drm/msm: devcoredump iommu fault support
drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 23 +++- drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 110 +++++++++++++++++++- drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c | 42 ++++++-- drivers/gpu/drm/msm/adreno/adreno_gpu.c | 15 +++ drivers/gpu/drm/msm/msm_gem.h | 1 + drivers/gpu/drm/msm/msm_gem_submit.c | 1 + drivers/gpu/drm/msm/msm_gpu.c | 48 +++++++++ drivers/gpu/drm/msm/msm_gpu.h | 17 +++ drivers/gpu/drm/msm/msm_gpummu.c | 5 + drivers/gpu/drm/msm/msm_iommu.c | 22 +++- drivers/gpu/drm/msm/msm_mmu.h | 5 +- drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 50 +++++++++ drivers/iommu/arm/arm-smmu/arm-smmu.c | 9 +- drivers/iommu/arm/arm-smmu/arm-smmu.h | 2 + include/linux/adreno-smmu-priv.h | 38 ++++++- 15 files changed, 367 insertions(+), 21 deletions(-)