[PATCH v2 0/7] Fix amdgpu_vm_pt_free warning

[Philip Yang]

When SVM range is unmapped from CPU, the mmu notifier callback update 
GPU page table to unmap the SVM range from GPU, this is the unlocked 
page table update context as we cannot take vm reservation lock. If 
unmapping from GPU free pt bo, this cause warning as vm reservation lock 
is not hold.

To fix the warning/race issue, we schedule pt_free_work to free pt bo. 
This has another race to remove vm_bo entry from vm status lists. Some 
of the vm status lists are protected by vm invalidate lock and the rest 
of lists are protected by vm reservation lock.

The purpose of this patch series is to use one vm status_lock to protect 
all vm status lists, and use it in pt_free_work to fix the race and 
remove the warning.

v2: Correct comments style, move status_lock definition before all the 
list_head members

Philip Yang (7):
  drm/amdgpu: Rename vm invalidate lock to status_lock
  drm/amdgpu: Use vm status_lock to protect relocated list
  drm/amdgpu: Use vm status_lock to protect vm idle list
  drm/amdgpu: Use vm status_lock to protect vm moved list
  drm/amdgpu: Use vm status_lock to protect vm evicted list
  drm/amdgpu: Use vm status_lock to protect pt free
  drm/amdgpu: Fix amdgpu_vm_pt_free warning

 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c    | 97 ++++++++++++++++-------
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h    |  9 ++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c | 44 +++++++++-
 3 files changed, 116 insertions(+), 34 deletions(-)

-- 
2.35.1