[PATCH 0/6] drm/amdgpu: Add flag to disable implicit sync for GEM operations.

[Tatsuyuki Ishi]

In Vulkan, it is the application's responsibility to perform adequate
synchronization before a sparse unmap, replace or BO destroy operation.
This adds an option to AMDGPU_VA_OPs to disable redundant implicit sync
that happens on sparse unmap or replace operations.

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).

This patchset also address a tangential issue that some changes were
not being flushed immediately after the ioctls, but were deferred to be
processed on the next CS submission, which also results in stalling.
A refactor of state machine is included to achieve this.

Compared to the previous series [1], this specifically targets the VM
operations and keep everything else intact, including implicit sync on
kernel-initiated moves.

I've been able to pass a full Vulkan CTS run on Navi 10 with this.

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

[1]: https://lore.kernel.org/all/20230821062005.109771-1-ishitatsuyuki@gmail.com/
[2]: https://gitlab.freedesktop.org/ishitatsuyuki/mesa/-/commits/vm-explicit-sync
[3]: https://github.com/ishitatsuyuki/linux/tree/explicit-sync-drm-misc-next

Tatsuyuki Ishi (6):
  drm/amdgpu: Don't implicit sync PRT maps.
  drm/amdgpu: Separate eviction from VM status.
  drm/amdgpu: Flush VM updates for split bindings eagerly.
  drm/amdgpu: Remove redundant state change after validation.
  drm/amdgpu: Add flag to disable implicit sync for GEM operations.
  drm/amdgpu: Bump amdgpu driver version.

 .../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c  |   2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c       |   2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c       |   3 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c       |  32 +--
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.h    |   7 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h     |   6 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c        | 185 ++++++++++--------
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h        |  27 +--
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c     |   1 +
 drivers/gpu/drm/amd/amdkfd/kfd_svm.c          |  18 +-
 include/uapi/drm/amdgpu_drm.h                 |   2 +
 11 files changed, 165 insertions(+), 120 deletions(-)

-- 
2.42.0