[PATCH 0/7] shadow page table support V6 ---> shadow bo support

[Chunming Zhou]

Since we cannot ensure VRAM is consistent after a GPU reset, page
table shadowing is necessary. Shadowed page tables are, in a sense, a
method to recover the consistent state of the page tables before the
reset occurred.

We need to allocate GTT bo as the shadow of VRAM bo when creating page table,
and make them the same. After gpu reset, we will need to use SDMA to copy GTT bo
content to VRAM bo, then page table will be recoveried.


V2:
Shadow bo uses a shadow entity running on normal run queue, after gpu reset,
we need to wait for all shadow jobs finished first, then recovery page table from shadow.

V3:
Addressed Christian comments for shadow bo part.

V4:
Switch back to update page table twice (one of two is for shadow)

V5:
make it be gerneic shadow bo support. Address Christian comments.

V6:
some improvements addressed comments from Christian.

Chunming Zhou (7):
  drm/amdgpu: add need backup function V2
  drm/amdgpu: add direct submision option for copy_buffer
  drm/amdgpu: sync bo and shadow V3
  drm/amdgpu: update pd shadow while updating pd V2
  drm/amdgpu: update pt shadow while updating pt V2
  drm/amdgpu: link all shadow bo V2
  drm/amdgpu: recover vram bo from shadow after gpu reset

 drivers/gpu/drm/amd/amdgpu/amdgpu.h           | 17 +++---
 drivers/gpu/drm/amd/amdgpu/amdgpu_benchmark.c |  3 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c    | 71 +++++++++++++++++++++++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c    | 78 ++++++++++++++++++++++++++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.h    | 12 +++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_test.c      |  4 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c       | 23 +++++---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c        | 76 +++++++++++++++++++-------
 8 files changed, 242 insertions(+), 42 deletions(-)

-- 
1.9.1