[PATCH v9 0/3] dma-fence: Deadline awareness (uabi edition)

Rob Clark
2023-08-23T21:57:09Z

This is a re-post of the remaining patches from:
https://patchwork.freedesktop.org/series/114490/

Part of the hold-up of the remaining uabi patches was compositor
support, but now an MR for kwin exists:

https://invent.kde.org/plasma/kwin/-/merge_requests/4358

The syncobj userspace is:

https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21973

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: Repost the remaining patches that expose new uabi to userspace.

Rob Clark (3):
drm/syncobj: Add deadline support for syncobj waits
dma-buf/sync_file: Add SET_DEADLINE ioctl
dma-buf/sw_sync: Add fence deadline support

drivers/dma-buf/dma-fence.c | 3 +-
drivers/dma-buf/sw_sync.c | 82 ++++++++++++++++++++++++++++++++++
drivers/dma-buf/sync_debug.h | 2 +
drivers/dma-buf/sync_file.c | 19 ++++++++
drivers/gpu/drm/drm_syncobj.c | 64 ++++++++++++++++++++------
include/uapi/drm/drm.h | 17 +++++++
include/uapi/linux/sync_file.h | 22 +++++++++
7 files changed, 195 insertions(+), 14 deletions(-)

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2.41.0