drm/amdgpu: Warn and update pin_size values when destroying a pinned BO

This shouldn't happen, but if it does, we'll get a backtrace of the
caller, and update the pin_size values as needed.

v2:
* Check bo->pin_count instead of placement flags (Christian König)

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_object.c

@@ -63,11 +63,35 @@ static bool amdgpu_need_backup(struct amdgpu_device *adev)
 	return true;
 }
 
+/**
+ * amdgpu_bo_subtract_pin_size - Remove BO from pin_size accounting
+ *
+ * @bo: &amdgpu_bo buffer object
+ *
+ * This function is called when a BO stops being pinned, and updates the
+ * &amdgpu_device pin_size values accordingly.
+ */
+static void amdgpu_bo_subtract_pin_size(struct amdgpu_bo *bo)
+{
+	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
+
+	if (bo->tbo.mem.mem_type == TTM_PL_VRAM) {
+		atomic64_sub(amdgpu_bo_size(bo), &adev->vram_pin_size);
+		atomic64_sub(amdgpu_vram_mgr_bo_visible_size(bo),
+			     &adev->visible_pin_size);
+	} else if (bo->tbo.mem.mem_type == TTM_PL_TT) {
+		atomic64_sub(amdgpu_bo_size(bo), &adev->gart_pin_size);
+	}
+}
+
 static void amdgpu_ttm_bo_destroy(struct ttm_buffer_object *tbo)
 {
 	struct amdgpu_device *adev = amdgpu_ttm_adev(tbo->bdev);
 	struct amdgpu_bo *bo = ttm_to_amdgpu_bo(tbo);
 
+	if (WARN_ON_ONCE(bo->pin_count > 0))
+		amdgpu_bo_subtract_pin_size(bo);
+
 	if (bo->kfd_bo)
 		amdgpu_amdkfd_unreserve_system_memory_limit(bo);
 
@@ -968,13 +992,7 @@ int amdgpu_bo_unpin(struct amdgpu_bo *bo)
 	if (bo->pin_count)
 		return 0;
 
-	if (bo->tbo.mem.mem_type == TTM_PL_VRAM) {
-		atomic64_sub(amdgpu_bo_size(bo), &adev->vram_pin_size);
-		atomic64_sub(amdgpu_vram_mgr_bo_visible_size(bo),
-			     &adev->visible_pin_size);
-	} else if (bo->tbo.mem.mem_type == TTM_PL_TT) {
-		atomic64_sub(amdgpu_bo_size(bo), &adev->gart_pin_size);
-	}
+	amdgpu_bo_subtract_pin_size(bo);
 
 	for (i = 0; i < bo->placement.num_placement; i++) {
 		bo->placements[i].lpfn = 0;