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Date: Thu, 16 Mar 2023 14:22:47 -0700
From: Rob Clark <robdclark@...il.com>
To: dri-devel@...ts.freedesktop.org
Cc: freedreno@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
Luben Tuikov <luben.tuikov@....com>,
Christian König <ckoenig.leichtzumerken@...il.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Matt Turner <mattst88@...il.com>,
Bas Nieuwenhuizen <bas@...nieuwenhuizen.nl>,
Rob Clark <robdclark@...omium.org>,
Abhinav Kumar <quic_abhinavk@...cinc.com>,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Douglas Anderson <dianders@...omium.org>,
Gustavo Padovan <gustavo@...ovan.org>,
Konrad Dybcio <konrad.dybcio@...aro.org>,
"moderated list:DMA BUFFER SHARING FRAMEWORK"
<linaro-mm-sig@...ts.linaro.org>,
"open list:DRM DRIVER FOR MSM ADRENO GPU"
<linux-arm-msm@...r.kernel.org>,
"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>,
"open list:DMA BUFFER SHARING FRAMEWORK"
<linux-media@...r.kernel.org>, Liu Shixin <liushixin2@...wei.com>,
Sean Paul <sean@...rly.run>,
Stephen Boyd <swboyd@...omium.org>,
Vinod Polimera <quic_vpolimer@...cinc.com>
Subject: Re: [PATCH v10 00/15] dma-fence: Deadline awareness
On Wed, Mar 8, 2023 at 7:53 AM Rob Clark <robdclark@...il.com> wrote:
>
> From: Rob Clark <robdclark@...omium.org>
>
> This series adds a deadline hint to fences, so realtime deadlines
> such as vblank can be communicated to the fence signaller for power/
> frequency management decisions.
>
> 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
>
> This iteration adds a dma-fence ioctl to set a deadline (both to
> support igt-tests, and compositors which delay decisions about which
> client buffer to display), and a sw_sync ioctl to read back the
> deadline. IGT tests utilizing these can be found at:
>
> https://gitlab.freedesktop.org/robclark/igt-gpu-tools/-/commits/fence-deadline
>
jfwiw, mesa side of this:
https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21973
BR,
-R
>
> 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
> v3: Add support in fence-array and fence-chain; Add some uabi to
> support igt tests and userspace compositors.
> v4: Rebase, address various comments, and add syncobj deadline
> support, and sync_file EPOLLPRI based on experience with perf/
> freq issues with clvk compute workloads on i915 (anv)
> v5: Clarify that this is a hint as opposed to a more hard deadline
> guarantee, switch to using u64 ns values in UABI (still absolute
> CLOCK_MONOTONIC values), drop syncobj related cap and driver
> feature flag in favor of allowing count_handles==0 for probing
> kernel support.
> v6: Re-work vblank helper to calculate time of _start_ of vblank,
> and work correctly if the last vblank event was more than a
> frame ago. Add (mostly unrelated) drm/msm patch which also
> uses the vblank helper. Use dma_fence_chain_contained(). More
> verbose syncobj UABI comments. Drop DMA_FENCE_FLAG_HAS_DEADLINE_BIT.
> v7: Fix kbuild complaints about vblank helper. Add more docs.
> v8: Add patch to surface sync_file UAPI, and more docs updates.
> v9: Drop (E)POLLPRI support.. I still like it, but not essential and
> it can always be revived later. Fix doc build warning.
> v10: Update 11/15 to handle multiple CRTCs
>
> Rob Clark (15):
> dma-buf/dma-fence: Add deadline awareness
> dma-buf/fence-array: Add fence deadline support
> dma-buf/fence-chain: Add fence deadline support
> dma-buf/dma-resv: Add a way to set fence deadline
> dma-buf/sync_file: Surface sync-file uABI
> dma-buf/sync_file: Add SET_DEADLINE ioctl
> dma-buf/sw_sync: Add fence deadline support
> drm/scheduler: Add fence deadline support
> drm/syncobj: Add deadline support for syncobj waits
> drm/vblank: Add helper to get next vblank time
> drm/atomic-helper: Set fence deadline for vblank
> drm/msm: Add deadline based boost support
> drm/msm: Add wait-boost support
> drm/msm/atomic: Switch to vblank_start helper
> drm/i915: Add deadline based boost support
>
> Rob Clark (15):
> dma-buf/dma-fence: Add deadline awareness
> dma-buf/fence-array: Add fence deadline support
> dma-buf/fence-chain: Add fence deadline support
> dma-buf/dma-resv: Add a way to set fence deadline
> dma-buf/sync_file: Surface sync-file uABI
> dma-buf/sync_file: Add SET_DEADLINE ioctl
> dma-buf/sw_sync: Add fence deadline support
> drm/scheduler: Add fence deadline support
> drm/syncobj: Add deadline support for syncobj waits
> drm/vblank: Add helper to get next vblank time
> drm/atomic-helper: Set fence deadline for vblank
> drm/msm: Add deadline based boost support
> drm/msm: Add wait-boost support
> drm/msm/atomic: Switch to vblank_start helper
> drm/i915: Add deadline based boost support
>
> Documentation/driver-api/dma-buf.rst | 16 ++++-
> drivers/dma-buf/dma-fence-array.c | 11 ++++
> drivers/dma-buf/dma-fence-chain.c | 12 ++++
> drivers/dma-buf/dma-fence.c | 60 ++++++++++++++++++
> drivers/dma-buf/dma-resv.c | 22 +++++++
> drivers/dma-buf/sw_sync.c | 81 +++++++++++++++++++++++++
> drivers/dma-buf/sync_debug.h | 2 +
> drivers/dma-buf/sync_file.c | 19 ++++++
> drivers/gpu/drm/drm_atomic_helper.c | 37 +++++++++++
> drivers/gpu/drm/drm_syncobj.c | 64 +++++++++++++++----
> drivers/gpu/drm/drm_vblank.c | 53 +++++++++++++---
> drivers/gpu/drm/i915/i915_request.c | 20 ++++++
> drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 15 -----
> drivers/gpu/drm/msm/msm_atomic.c | 8 ++-
> drivers/gpu/drm/msm/msm_drv.c | 12 ++--
> drivers/gpu/drm/msm/msm_fence.c | 74 ++++++++++++++++++++++
> drivers/gpu/drm/msm/msm_fence.h | 20 ++++++
> drivers/gpu/drm/msm/msm_gem.c | 5 ++
> drivers/gpu/drm/msm/msm_kms.h | 8 ---
> drivers/gpu/drm/scheduler/sched_fence.c | 46 ++++++++++++++
> drivers/gpu/drm/scheduler/sched_main.c | 2 +-
> include/drm/drm_vblank.h | 1 +
> include/drm/gpu_scheduler.h | 17 ++++++
> include/linux/dma-fence.h | 22 +++++++
> include/linux/dma-resv.h | 2 +
> include/uapi/drm/drm.h | 17 ++++++
> include/uapi/drm/msm_drm.h | 14 ++++-
> include/uapi/linux/sync_file.h | 59 +++++++++++-------
> 28 files changed, 640 insertions(+), 79 deletions(-)
>
> --
> 2.39.2
>
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