[PATCH 00/18] shadow page table support V3

[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.

Chunming Zhou (18):
  drm/amdgpu: add shadow bo support V2
  drm/amdgpu: validate shadow as well when validating bo
  drm/amdgpu: allocate shadow for pd/pt bo V2
  drm/amdgpu: add shadow flag V2
  drm/amdgpu: sync bo and shadow
  drm/amdgpu: implement vm recovery function from shadow
  drm/amdgpu: add shadow_entity for shadow page table updates
  drm/amdgpu: update pd shadow bo
  drm/amdgpu: update pt shadow
  drm/amd: add last fence in sched entity
  drm/amdgpu: link all vm clients
  drm/amdgpu: add vm_list_lock
  drm/amd: add block entity function
  drm/amdgpu: add shadow fence owner
  drm/amd: block entity
  drm/amdgpu: recover page tables after gpu reset
  drm/amdgpu: add need backup function
  drm/amdgpu: add backup condition for vm

 drivers/gpu/drm/amd/amdgpu/amdgpu.h           |  25 +++
 drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c        |  82 +++++---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c    |  88 +++++++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c    | 100 ++++++++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.h    |   5 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c      |   3 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c        | 281 +++++++++++++++++++-------
 drivers/gpu/drm/amd/scheduler/gpu_scheduler.c |  38 +++-
 drivers/gpu/drm/amd/scheduler/gpu_scheduler.h |   5 +
 include/uapi/drm/amdgpu_drm.h                 |   2 +
 10 files changed, 524 insertions(+), 105 deletions(-)

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1.9.1