[PATCH 0/6] Add submission flag to disable implicit sync.

[Bas Nieuwenhuizen]

For the rationale see the earlier RFC by Faith: https://lists.freedesktop.org/archives/amd-gfx/2024-August/112273.html

This mainly makes two changes:

1. Uses a submission flag rather than a context creation flag.
2. Uses DMA_RESV_USAGE_BOOKKEEP to avoid adding implicit fences still.

Note that this doesn't disable implicit sync wrt VM ops (map/unmap), I know we have series for that going around,
but I believe doing just submissions here is less involved and doesn't really complicate doing VM ops later.

As of now this has received a limited set of testing, no full CTS runs etc yet.

For Userspace see:

libdrm: https://gitlab.freedesktop.org/bnieuwenhuizen/drm/-/commits/basic-explicit-sync

mesa: https://gitlab.freedesktop.org/bnieuwenhuizen/mesa/-/commits/basic-explicit-sync

(Still missing a bunch of the version bumps & version checks, would like to postpone that till we know the actual version)

Bas Nieuwenhuizen (6):
  amdgpu: Add usage argument to amdgpu_sync_resv.
  amdgpu: Ignore BOOKKEEP fences for submissions.
  drm/amdgpu: Check cs flags.
  drm/amdgpu: Add UAPI for disabling implicit sync per submission.
  drm/amdgpu: Implement disabling implicit sync per submission.
  drm/amdgpu: Bump the driver version for the new flag.

 .../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c  |  1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c        | 21 ++++++++++++++++---
 drivers/gpu/drm/amd/amdgpu/amdgpu_cs.h        |  1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c       |  3 ++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c    |  3 ++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c      |  7 +++----
 drivers/gpu/drm/amd/amdgpu/amdgpu_sync.h      |  4 ++--
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c   |  3 ++-
 include/uapi/drm/amdgpu_drm.h                 |  6 ++++++
 9 files changed, 37 insertions(+), 12 deletions(-)

-- 
2.45.2