dma-buf: wait for map to complete for static attachments

We have previously done that in the individual drivers but it is
more defensive to move that into the common code.

Dynamic attachments should wait for map operations to complete by themselves.
Signed-off-by: NChristian König <christian.koenig@amd.com>
Reviewed-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220407085946.744568-12-christian.koenig@amd.com

drivers/dma-buf/dma-buf.c

@@ -661,12 +661,24 @@ static struct sg_table * __map_dma_buf(struct dma_buf_attachment *attach,
 				       enum dma_data_direction direction)
 {
 	struct sg_table *sg_table;
+	signed long ret;
 
 	sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction);
+	if (IS_ERR_OR_NULL(sg_table))
+		return sg_table;
 
-	if (!IS_ERR_OR_NULL(sg_table))
-		mangle_sg_table(sg_table);
+	if (!dma_buf_attachment_is_dynamic(attach)) {
+		ret = dma_resv_wait_timeout(attach->dmabuf->resv,
+					    DMA_RESV_USAGE_KERNEL, true,
+					    MAX_SCHEDULE_TIMEOUT);
+		if (ret < 0) {
+			attach->dmabuf->ops->unmap_dma_buf(attach, sg_table,
+							   direction);
+			return ERR_PTR(ret);
+		}
+	}
 
+	mangle_sg_table(sg_table);
 	return sg_table;
 }
 

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

@@ -102,21 +102,9 @@ static int amdgpu_dma_buf_pin(struct dma_buf_attachment *attach)
 {
 	struct drm_gem_object *obj = attach->dmabuf->priv;
 	struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
-	int r;
 
 	/* pin buffer into GTT */
-	r = amdgpu_bo_pin(bo, AMDGPU_GEM_DOMAIN_GTT);
-	if (r)
-		return r;
-
-	if (bo->tbo.moving) {
-		r = dma_fence_wait(bo->tbo.moving, true);
-		if (r) {
-			amdgpu_bo_unpin(bo);
-			return r;
-		}
-	}
-	return 0;
+	return amdgpu_bo_pin(bo, AMDGPU_GEM_DOMAIN_GTT);
 }
 
 /**

drivers/gpu/drm/nouveau/nouveau_prime.c

@@ -93,22 +93,7 @@ int nouveau_gem_prime_pin(struct drm_gem_object *obj)
 	if (ret)
 		return -EINVAL;
 
-	ret = ttm_bo_reserve(&nvbo->bo, false, false, NULL);
-	if (ret)
-		goto error;
-
-	if (nvbo->bo.moving)
-		ret = dma_fence_wait(nvbo->bo.moving, true);
-
-	ttm_bo_unreserve(&nvbo->bo);
-	if (ret)
-		goto error;
-
-	return ret;
-
-error:
-	nouveau_bo_unpin(nvbo);
-	return ret;
+	return 0;
 }
 
 void nouveau_gem_prime_unpin(struct drm_gem_object *obj)

drivers/gpu/drm/radeon/radeon_prime.c

@@ -77,19 +77,9 @@ int radeon_gem_prime_pin(struct drm_gem_object *obj)
 
 	/* pin buffer into GTT */
 	ret = radeon_bo_pin(bo, RADEON_GEM_DOMAIN_GTT, NULL);
-	if (unlikely(ret))
-		goto error;
-
-	if (bo->tbo.moving) {
-		ret = dma_fence_wait(bo->tbo.moving, false);
-		if (unlikely(ret)) {
-			radeon_bo_unpin(bo);
-			goto error;
-		}
-	}
-
+	if (likely(ret == 0))
 		bo->prime_shared_count++;
-error:
+
 	radeon_bo_unreserve(bo);
 	return ret;
 }