Re: [PATCH v7 00/15] dma-fence: Deadline awareness

From: Bagas Sanjaya
Date: Tue Feb 28 2023 - 07:43:29 EST


On Mon, Feb 27, 2023 at 11:35:06AM -0800, Rob Clark wrote:
> From: Rob Clark <robdclark@xxxxxxxxxxxx>
>
> 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
>
>
> 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.
>

I want to apply this series for testing, but it can't be applied cleanly
on current drm-misc tree. On what tree (and commit) is this series based
on?

--
An old man doll... just what I always wanted! - Clara

Attachment: signature.asc
Description: PGP signature