[PATCH v2 0/4] amdgpu: Allow explicitly synchronized submissions.

[Tatsuyuki Ishi]

This adds a context option to use DMA_RESV_USAGE_BOOKKEEP for userspace
submissions. This is a respin of [1] but rebased on top of the newly
introduced drm_exec helpers.

Disabling implicit sync is something we've wanted in RADV for a while
for resolving some corner cases. A more immediate thing that would be
solved here is avoiding a bunch of implicit sync on GPU map/unmap
operations as well, which helps with stutter around sparse maps/unmaps.

This has seen a significant improvement in stutter in Forza Horizon 5
and Forza Horizon 4. (As games that had significant issues in sparse
binding related stutter). I've been able to pass a full Vulkan CTS run
on Navi 10 with this.

(Note that the drm_exec patchset has introduced new CTS failures with
duplicate BOs, but we will be tracking that separately.)

Userspace code for this is available at [2] and a branch for the kernel
code is available at [3].

[1]: https://patchwork.freedesktop.org/series/107233/
[2]: https://gitlab.freedesktop.org/ishitatsuyuki/mesa/-/commits/single-sparse-queue-explicit-rebase
[3]: https://github.com/ishitatsuyuki/linux/tree/explicit-sync-drm-misc-next

Bas Nieuwenhuizen (4):
  drm/amdgpu: Add separate mode for syncing DMA_RESV_USAGE_BOOKKEEP.
  drm/amdgpu: Allow explicit sync for VM ops.
  drm/amdgpu: Add option to disable implicit sync for a context.
  drm/amdgpu: Bump amdgpu driver version.

 .../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c  |  2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c        | 18 +++++++----
 drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c       | 30 +++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.h       |  1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c       |  3 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c    | 11 ++++---
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.h    |  3 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c      | 11 +++++--
 drivers/gpu/drm/amd/amdgpu/amdgpu_sync.h      |  4 +--
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm_cpu.c    |  3 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c   |  3 +-
 include/uapi/drm/amdgpu_drm.h                 |  4 +++
 12 files changed, 74 insertions(+), 19 deletions(-)

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2.41.0