This series implements preemption for A7XX targets, which allows the GPU to switch to an higher priority ring when work is pushed to it, reducing latency for high priority submissions. This series enables L1 preemption with skip_save_restore which requires the following userspace patches to function: https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30544 A flag is added to `msm_submitqueue_create` to only allow submissions from compatible userspace to be preempted, therefore maintaining compatibility. Some commits from this series are based on a previous series to enable preemption on A6XX targets: https://lkml.kernel.org/1520489185-21828-1-git-send-email-smasetty@xxxxxxxxxxxxxx Signed-off-by: Antonino Maniscalco <antomani103@xxxxxxxxx> --- Changes in v2: - Added preept_record_size for X185 in PATCH 3/7 - Added patches to reset perf counters - Dropped unused defines - Dropped unused variable (fixes warning) - Only enable preemption on a750 - Reject MSM_SUBMITQUEUE_ALLOW_PREEMPT for unsupported targets - Added Akhil's Reviewed-By tags to patches 1/9,2/9,3/9 - Added Neil's Tested-By tags - Added explanation for UAPI changes in commit message - Link to v1: https://lore.kernel.org/r/20240815-preemption-a750-t-v1-0-7bda26c34037@xxxxxxxxx --- Antonino Maniscalco (9): drm/msm: Fix bv_fence being used as bv_rptr drm/msm: Add submitqueue setup and close drm/msm: Add a `preempt_record_size` field drm/msm/A6xx: Implement preemption for A7XX targets drm/msm/A6xx: Sync relevant adreno_pm4.xml changes drm/msm/A6xx: Use posamble to reset counters on preemption drm/msm/A6xx: Add traces for preemption drm/msm/A6XX: Add a flag to allow preemption to submitqueue_create drm/msm/A6xx: Enable preemption for A750 drivers/gpu/drm/msm/Makefile | 1 + drivers/gpu/drm/msm/adreno/a6xx_catalog.c | 4 + drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 353 +++++++++++++++- drivers/gpu/drm/msm/adreno/a6xx_gpu.h | 174 ++++++++ drivers/gpu/drm/msm/adreno/a6xx_preempt.c | 462 +++++++++++++++++++++ drivers/gpu/drm/msm/adreno/adreno_gpu.h | 8 +- drivers/gpu/drm/msm/msm_gpu.h | 7 + drivers/gpu/drm/msm/msm_gpu_trace.h | 28 ++ drivers/gpu/drm/msm/msm_ringbuffer.h | 8 + drivers/gpu/drm/msm/msm_submitqueue.c | 13 + .../gpu/drm/msm/registers/adreno/adreno_pm4.xml | 39 +- include/uapi/drm/msm_drm.h | 5 +- 12 files changed, 1062 insertions(+), 40 deletions(-) --- base-commit: 7c626ce4bae1ac14f60076d00eafe71af30450ba change-id: 20240815-preemption-a750-t-fcee9a844b39 Best regards, -- Antonino Maniscalco <antomani103@xxxxxxxxx>
