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[73.25.156.94]) by smtp.gmail.com with ESMTPSA id n33sm16516858pgm.55.2021.08.07.11.33.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 07 Aug 2021 11:33:52 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, Daniel Vetter , =?utf-8?q?Christian_K=C3=B6nig?= , Rob Clark , Alex Deucher , Andrey Grodzovsky , =?utf-8?q?Christian_K=C3=B6n?= =?utf-8?q?ig?= , Gustavo Padovan , Jack Zhang , Lee Jones , linaro-mm-sig@lists.linaro.org (moderated list:DMA BUFFER SHARING FRAMEWORK), linux-kernel@vger.kernel.org (open list), linux-media@vger.kernel.org (open list:DMA BUFFER SHARING FRAMEWORK), Luben Tuikov , Steven Price , Tian Tao Subject: [PATCH v2 0/5] dma-fence: Deadline awareness Date: Sat, 7 Aug 2021 11:37:54 -0700 Message-Id: <20210807183804.459850-1-robdclark@gmail.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-LSpam-Score: -3.2 (---) X-LSpam-Report: No, score=-3.2 required=5.0 tests=BAYES_00=-1.9,DKIM_SIGNED=0.1,DKIM_VALID=-0.1,DKIM_VALID_AU=-0.1,FREEMAIL_FORGED_FROMDOMAIN=0.001,FREEMAIL_FROM=0.001,HEADER_FROM_DIFFERENT_DOMAINS=0.5,MAILING_LIST_MULTI=-1,RCVD_IN_DNSWL_LOW=-0.7 autolearn=ham autolearn_force=no From: Rob Clark Based on discussion from a previous series[1] to add a "boost" mechanism when, for example, vblank deadlines are missed. Instead of a boost callback, this approach adds a way to set a deadline on the fence, by which the waiter would like to see the fence signalled. I've not yet had a chance to re-work the drm/msm part of this, but wanted to send this out as an RFC in case I don't have a chance to finish the drm/msm part this week. Original description: In some cases, like double-buffered rendering, missing vblanks can trick the GPU into running at a lower frequence, when really we want to be running at a higher frequency to not miss the vblanks in the first place. This is partially inspired by a trick i915 does, but implemented via dma-fence for a couple of reasons: 1) To continue to be able to use the atomic helpers 2) To support cases where display and gpu are different drivers [1] https://patchwork.freedesktop.org/series/90331/ v1: https://patchwork.freedesktop.org/series/93035/ v2: Move filtering out of later deadlines to fence implementation to avoid increasing the size of dma_fence Rob Clark (5): dma-fence: Add deadline awareness drm/vblank: Add helper to get next vblank time drm/atomic-helper: Set fence deadline for vblank drm/scheduler: Add fence deadline support drm/msm: Add deadline based boost support drivers/dma-buf/dma-fence.c | 20 +++++++ drivers/gpu/drm/drm_atomic_helper.c | 36 ++++++++++++ drivers/gpu/drm/drm_vblank.c | 31 ++++++++++ drivers/gpu/drm/msm/msm_fence.c | 76 +++++++++++++++++++++++++ drivers/gpu/drm/msm/msm_fence.h | 20 +++++++ drivers/gpu/drm/msm/msm_gpu.h | 1 + drivers/gpu/drm/msm/msm_gpu_devfreq.c | 20 +++++++ drivers/gpu/drm/scheduler/sched_fence.c | 25 ++++++++ drivers/gpu/drm/scheduler/sched_main.c | 3 + include/drm/drm_vblank.h | 1 + include/drm/gpu_scheduler.h | 6 ++ include/linux/dma-fence.h | 16 ++++++ 12 files changed, 255 insertions(+)