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[79.12.161.203]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a99103b314asm102382366b.103.2024.10.03.09.12.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 03 Oct 2024 09:12:56 -0700 (PDT) From: Antonino Maniscalco Subject: [PATCH v8 00/12] Preemption support for A7XX Date: Thu, 03 Oct 2024 18:12:49 +0200 Message-Id: <20241003-preemption-a750-t-v8-0-5c6cb9f256e0@gmail.com> Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-B4-Tracking: v=1; b=H4sIAILC/mYC/33QTW7DIBAF4KtErEs1wPDXVe9RdYFhSJDqOLItq 1Xku5d4U+RYXT40fDN6dzbRWGhib6c7G2kpUxmuNbiXE4uXcD0TL6lmJkEiOKH5bSTqb3Md48F q4DPPkcgHh9gpz+q/OpHL92Z+fNZ8KdM8jD/bikU8Xv/TFsGB2y4FaaJCUPb93Ify9RqHnj20R TaCgiNBVsGZQBSSjMnBXlB/gofDG1QVcvJojffZdnEvYCMIeyRgFbxO6EBIgvAk6EaQeCToKkB HsstOROGeejCtYI4EszVpSFBWBl3eC7YRjpu0VUDrQEUbdDDYCuu6/gJPwLNMPgIAAA== X-Change-ID: 20240815-preemption-a750-t-fcee9a844b39 To: Rob Clark , Sean Paul , Konrad Dybcio , Abhinav Kumar , Dmitry Baryshkov , Marijn Suijten , David Airlie , Daniel Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Jonathan Corbet Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Antonino Maniscalco , Akhil P Oommen , Neil Armstrong , Sharat Masetty X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1727971975; l=6265; i=antomani103@gmail.com; s=20240815; h=from:subject:message-id; bh=rkp7RZ94GbN8pEuZecJnFPn4wVK/JYzqYxT1p88HKmw=; b=aFlFHevyD+QE1so4ObJaxnEoxJsHXL440+3PXsAztqmYAwRp22wnI+HJyQ+dsw6nAMorSoMZX BEOV8lKUSarBLaF+9afDm74tQakeQDUqJYM92ZaqhE9PX3p+yiJTJ6v X-Developer-Key: i=antomani103@gmail.com; a=ed25519; pk=0zicFb38tVla+iHRo4kWpOMsmtUrpGBEa7LkFF81lyY= 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. Preemption is currently only enabled by default on A750, it can be enabled on other targets through the `enable_preemption` module parameter. This is because more testing is required on other targets. For testing on other HW it is sufficient to set that parameter to a value of 1, then using the branch of mesa linked above, `TU_DEBUG=hiprio` allows to run any application as high priority therefore preempting submissions from other applications. The `msm_gpu_preemption_trigger` and `msm_gpu_preemption_irq` traces added in this series can be used to observe preemption's behavior as well as measuring preemption latency. 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@codeaurora.org Signed-off-by: Antonino Maniscalco --- Changes in v8: - Updated commit message on 11/12 to reflect the fact that we are enabling on more targets - Fixed typo in documentation - Link to v7: https://lore.kernel.org/r/20240930-preemption-a750-t-v7-0-47803c7a5a64@gmail.com Changes in v7: - Enable preemption on more targets - Move pwrup reglist to a6xx_catalog and get rid of ifpc list - Split out smmu_info from preemption record in separate GPU_RO allocation - Make postmable buffer GPU_RO - Link to v6: https://lore.kernel.org/r/20240926-preemption-a750-t-v6-0-7b6e1ef3648f@gmail.com Changes in v6: - Fixed commit message prefix (A6XX->a6xx) - Allow preemption to be disabled at run time - Link to v5: https://lore.kernel.org/r/20240924-preemption-a750-t-v5-0-0be2bf81c187@gmail.com Changes in v5: - Made preemption documentation more detailed - Added ring ID to preempt_record BO name - Added Neil's Tested-By tags - Added Akhil's Reviewed-By tags - Added Rob's Tested-By tags - Moved preemption module params to adreno_device.c - Link to v4: https://lore.kernel.org/r/20240917-preemption-a750-t-v4-0-95d48012e0ac@gmail.com Changes in v4: - Added missing register in pwrup list - Removed and rearrange barriers - Renamed `skip_inline_wptr` to `restore_wptr` - Track ctx seqno per ring - Removed secure preempt context - NOP out postamble to disable it instantly - Only emit pwrup reglist once - Document bv_rptr_addr - Removed unused A6XX_PREEMPT_USER_RECORD_SIZE - Set name on preempt record buffer - Link to v3: https://lore.kernel.org/r/20240905-preemption-a750-t-v3-0-fd947699f7bc@gmail.com Changes in v3: - Added documentation about preemption - Use quirks to determine which target supports preemption - Add a module parameter to force disabling or enabling preemption - Clear postamble when profiling - Define A6XX_CP_CONTEXT_SWITCH_CNTL_LEVEL fields in a6xx.xml - Make preemption records MAP_PRIV - Removed user ctx record (NON_PRIV) and patch 2/9 as it's not needed anymore - Link to v2: https://lore.kernel.org/r/20240830-preemption-a750-t-v2-0-86aeead2cd80@gmail.com 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@gmail.com --- Antonino Maniscalco (12): drm/msm: Fix bv_fence being used as bv_rptr drm/msm/a6xx: Track current_ctx_seqno per ring drm/msm: Add a `preempt_record_size` field drm/msm: Add CONTEXT_SWITCH_CNTL bitfields drm/msm/a6xx: Add a pwrup_list field to a6xx_info 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 tested a7xx targets Documentation: document adreno preemption Documentation/gpu/msm-preemption.rst | 99 +++++ drivers/gpu/drm/msm/Makefile | 1 + drivers/gpu/drm/msm/adreno/a2xx_gpu.c | 2 +- drivers/gpu/drm/msm/adreno/a3xx_gpu.c | 2 +- drivers/gpu/drm/msm/adreno/a4xx_gpu.c | 2 +- drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 6 +- drivers/gpu/drm/msm/adreno/a6xx_catalog.c | 42 +- drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 235 ++++++++++- drivers/gpu/drm/msm/adreno/a6xx_gpu.h | 170 ++++++++ drivers/gpu/drm/msm/adreno/a6xx_preempt.c | 457 +++++++++++++++++++++ drivers/gpu/drm/msm/adreno/adreno_device.c | 4 + drivers/gpu/drm/msm/adreno/adreno_gpu.h | 22 +- drivers/gpu/drm/msm/msm_gpu.c | 2 +- drivers/gpu/drm/msm/msm_gpu.h | 11 - drivers/gpu/drm/msm/msm_gpu_trace.h | 28 ++ drivers/gpu/drm/msm/msm_ringbuffer.h | 18 + drivers/gpu/drm/msm/msm_submitqueue.c | 7 + drivers/gpu/drm/msm/registers/adreno/a6xx.xml | 7 +- .../gpu/drm/msm/registers/adreno/adreno_pm4.xml | 39 +- include/uapi/drm/msm_drm.h | 5 +- 20 files changed, 1090 insertions(+), 69 deletions(-) --- base-commit: 7c626ce4bae1ac14f60076d00eafe71af30450ba change-id: 20240815-preemption-a750-t-fcee9a844b39 Best regards,