Am 23.03.2017 um 20:27 schrieb Nicolai Hähnle:
From: Nicolai Hähnle <nicolai.haeh...@amd.com>

We will add the fence to freed buffer objects in a later commit, to ensure
that the underlying memory can only be re-used after all references in
page tables have been cleared.

Signed-off-by: Nicolai Hähnle <nicolai.haeh...@amd.com>

Reviewed-by: Christian König <christian.koe...@amd.com> for both.

---
  drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c  |  2 +-
  drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c |  2 +-
  drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c  | 21 +++++++++++++++------
  drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h  |  3 ++-
  4 files changed, 19 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index 55d553a..85e6070 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -778,21 +778,21 @@ static int amdgpu_bo_vm_update_pte(struct 
amdgpu_cs_parser *p)
        int i, r;
r = amdgpu_vm_update_page_directory(adev, vm);
        if (r)
                return r;
r = amdgpu_sync_fence(adev, &p->job->sync, vm->page_directory_fence);
        if (r)
                return r;
- r = amdgpu_vm_clear_freed(adev, vm);
+       r = amdgpu_vm_clear_freed(adev, vm, NULL);
        if (r)
                return r;
r = amdgpu_vm_bo_update(adev, fpriv->prt_va, false);
        if (r)
                return r;
r = amdgpu_sync_fence(adev, &p->job->sync,
                              fpriv->prt_va->last_pt_update);
        if (r)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
index be9fb2c..4a53c43 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
@@ -535,21 +535,21 @@ static void amdgpu_gem_va_update_vm(struct amdgpu_device 
*adev,
r = amdgpu_vm_validate_pt_bos(adev, vm, amdgpu_gem_va_check,
                                      NULL);
        if (r)
                goto error;
r = amdgpu_vm_update_page_directory(adev, vm);
        if (r)
                goto error;
- r = amdgpu_vm_clear_freed(adev, vm);
+       r = amdgpu_vm_clear_freed(adev, vm, NULL);
        if (r)
                goto error;
if (operation == AMDGPU_VA_OP_MAP ||
            operation == AMDGPU_VA_OP_REPLACE)
                r = amdgpu_vm_bo_update(adev, bo_va, false);
error:
        if (r && r != -ERESTARTSYS)
                DRM_ERROR("Couldn't update BO_VA (%d)\n", r);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index dd7df45..2c95a75 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1397,48 +1397,57 @@ static void amdgpu_vm_prt_fini(struct amdgpu_device 
*adev, struct amdgpu_vm *vm)
        }
kfree(shared);
  }
/**
   * amdgpu_vm_clear_freed - clear freed BOs in the PT
   *
   * @adev: amdgpu_device pointer
   * @vm: requested vm
+ * @fence: optional resulting fence (unchanged if no work needed to be done
+ * or if an error occurred)
   *
   * Make sure all freed BOs are cleared in the PT.
   * Returns 0 for success.
   *
   * PTs have to be reserved and mutex must be locked!
   */
  int amdgpu_vm_clear_freed(struct amdgpu_device *adev,
-                         struct amdgpu_vm *vm)
+                         struct amdgpu_vm *vm,
+                         struct fence **fence)
  {
        struct amdgpu_bo_va_mapping *mapping;
-       struct fence *fence = NULL;
+       struct fence *f = NULL;
        int r;
while (!list_empty(&vm->freed)) {
                mapping = list_first_entry(&vm->freed,
                        struct amdgpu_bo_va_mapping, list);
                list_del(&mapping->list);
r = amdgpu_vm_bo_split_mapping(adev, NULL, 0, NULL, vm, mapping,
-                                              0, 0, &fence);
-               amdgpu_vm_free_mapping(adev, vm, mapping, fence);
+                                              0, 0, &f);
+               amdgpu_vm_free_mapping(adev, vm, mapping, f);
                if (r) {
-                       fence_put(fence);
+                       fence_put(f);
                        return r;
                }
+       }
+ if (fence && f) {
+               fence_put(*fence);
+               *fence = f;
+       } else {
+               fence_put(f);
        }
-       fence_put(fence);
+
        return 0;
} /**
   * amdgpu_vm_clear_invalids - clear invalidated BOs in the PT
   *
   * @adev: amdgpu_device pointer
   * @vm: requested vm
   *
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
index ff10fa5..9d5a572 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
@@ -187,21 +187,22 @@ int amdgpu_vm_alloc_pts(struct amdgpu_device *adev,
                        struct amdgpu_vm *vm,
                        uint64_t saddr, uint64_t size);
  int amdgpu_vm_grab_id(struct amdgpu_vm *vm, struct amdgpu_ring *ring,
                      struct amdgpu_sync *sync, struct fence *fence,
                      struct amdgpu_job *job);
  int amdgpu_vm_flush(struct amdgpu_ring *ring, struct amdgpu_job *job);
  void amdgpu_vm_reset_id(struct amdgpu_device *adev, unsigned vm_id);
  int amdgpu_vm_update_page_directory(struct amdgpu_device *adev,
                                    struct amdgpu_vm *vm);
  int amdgpu_vm_clear_freed(struct amdgpu_device *adev,
-                         struct amdgpu_vm *vm);
+                         struct amdgpu_vm *vm,
+                         struct fence **fence);
  int amdgpu_vm_clear_invalids(struct amdgpu_device *adev, struct amdgpu_vm *vm,
                             struct amdgpu_sync *sync);
  int amdgpu_vm_bo_update(struct amdgpu_device *adev,
                        struct amdgpu_bo_va *bo_va,
                        bool clear);
  void amdgpu_vm_bo_invalidate(struct amdgpu_device *adev,
                             struct amdgpu_bo *bo);
  struct amdgpu_bo_va *amdgpu_vm_bo_find(struct amdgpu_vm *vm,
                                       struct amdgpu_bo *bo);
  struct amdgpu_bo_va *amdgpu_vm_bo_add(struct amdgpu_device *adev,


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