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From: Rob Clark <robdclark@gmail.com>
To: dri-devel@lists.freedesktop.org
Cc: linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org,
	"Daniel Vetter" <daniel@ffwll.ch>,
	"Christian König" <ckoenig.leichtzumerken@gmail.com>,
	"Rob Clark" <robdclark@chromium.org>,
	"Alex Deucher" <alexander.deucher@amd.com>,
	"Andrey Grodzovsky" <andrey.grodzovsky@amd.com>,
	"Christian König" <christian.koenig@amd.com>,
	"Gustavo Padovan" <gustavo@padovan.org>,
	"Jack Zhang" <Jack.Zhang1@amd.com>,
	"Lee Jones" <lee.jones@linaro.org>,
	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" <luben.tuikov@amd.com>,
	"Steven Price" <steven.price@arm.com>,
	"Tian Tao" <tiantao6@hisilicon.com>
Subject: [PATCH v2 0/5] dma-fence: Deadline awareness
Date: Sat,  7 Aug 2021 11:37:54 -0700	[thread overview]
Message-ID: <20210807183804.459850-1-robdclark@gmail.com> (raw)

From: Rob Clark <robdclark@chromium.org>

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(+)

-- 
2.31.1


             reply	other threads:[~2021-08-07 18:33 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-07 18:37 Rob Clark [this message]
2021-08-07 18:37 ` [PATCH v2 1/5] dma-fence: Add deadline awareness Rob Clark
2021-08-16 10:15   ` Christian König
2021-08-07 18:37 ` [PATCH v2 2/5] drm/vblank: Add helper to get next vblank time Rob Clark
2021-08-07 18:37 ` [PATCH v2 3/5] drm/atomic-helper: Set fence deadline for vblank Rob Clark
2021-08-16 15:35   ` Daniel Vetter
2021-08-07 18:37 ` [PATCH v2 4/5] drm/scheduler: Add fence deadline support Rob Clark
2021-08-16 10:14   ` Christian König
2021-08-16 15:38     ` Daniel Vetter
2021-08-16 22:25       ` Rob Clark
2021-08-17  9:04         ` Daniel Vetter
2021-08-07 18:37 ` [PATCH v2 5/5] drm/msm: Add deadline based boost support Rob Clark
2021-08-16 10:16 ` [PATCH v2 0/5] dma-fence: Deadline awareness Christian König
2021-08-16 22:29   ` Rob Clark
2021-08-17  9:00     ` Christian König

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