drm/ttm: nuke invalidate_caches callback

Another completely unused feature.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Link: https://patchwork.freedesktop.org/patch/348265/

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

@@ -68,11 +68,6 @@ static int amdgpu_map_buffer(struct ttm_buffer_object *bo,
 static int amdgpu_ttm_debugfs_init(struct amdgpu_device *adev);
 static void amdgpu_ttm_debugfs_fini(struct amdgpu_device *adev);
 
-static int amdgpu_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
-{
-	return 0;
-}
-
 /**
  * amdgpu_init_mem_type - Initialize a memory manager for a specific type of
  * memory request.
@@ -1637,7 +1632,6 @@ static struct ttm_bo_driver amdgpu_bo_driver = {
 	.ttm_tt_create = &amdgpu_ttm_tt_create,
 	.ttm_tt_populate = &amdgpu_ttm_tt_populate,
 	.ttm_tt_unpopulate = &amdgpu_ttm_tt_unpopulate,
-	.invalidate_caches = &amdgpu_invalidate_caches,
 	.init_mem_type = &amdgpu_init_mem_type,
 	.eviction_valuable = amdgpu_ttm_bo_eviction_valuable,
 	.evict_flags = &amdgpu_evict_flags,

drivers/gpu/drm/nouveau/nouveau_bo.c

@@ -646,13 +646,6 @@ nouveau_ttm_tt_create(struct ttm_buffer_object *bo, uint32_t page_flags)
 	return nouveau_sgdma_create_ttm(bo, page_flags);
 }
 
-static int
-nouveau_bo_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
-{
-	/* We'll do this from user space. */
-	return 0;
-}
-
 static int
 nouveau_bo_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 			 struct ttm_mem_type_manager *man)
@@ -1696,7 +1689,6 @@ struct ttm_bo_driver nouveau_bo_driver = {
 	.ttm_tt_create = &nouveau_ttm_tt_create,
 	.ttm_tt_populate = &nouveau_ttm_tt_populate,
 	.ttm_tt_unpopulate = &nouveau_ttm_tt_unpopulate,
-	.invalidate_caches = nouveau_bo_invalidate_caches,
 	.init_mem_type = nouveau_bo_init_mem_type,
 	.eviction_valuable = ttm_bo_eviction_valuable,
 	.evict_flags = nouveau_bo_evict_flags,

drivers/gpu/drm/qxl/qxl_ttm.c

@@ -48,11 +48,6 @@ static struct qxl_device *qxl_get_qdev(struct ttm_bo_device *bdev)
 	return qdev;
 }
 
-static int qxl_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
-{
-	return 0;
-}
-
 static int qxl_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 			     struct ttm_mem_type_manager *man)
 {
@@ -256,7 +251,6 @@ static void qxl_bo_move_notify(struct ttm_buffer_object *bo,
 
 static struct ttm_bo_driver qxl_bo_driver = {
 	.ttm_tt_create = &qxl_ttm_tt_create,
-	.invalidate_caches = &qxl_invalidate_caches,
 	.init_mem_type = &qxl_init_mem_type,
 	.eviction_valuable = ttm_bo_eviction_valuable,
 	.evict_flags = &qxl_evict_flags,

drivers/gpu/drm/radeon/radeon_ttm.c

@@ -66,11 +66,6 @@ static struct radeon_device *radeon_get_rdev(struct ttm_bo_device *bdev)
 	return rdev;
 }
 
-static int radeon_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
-{
-	return 0;
-}
-
 static int radeon_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 				struct ttm_mem_type_manager *man)
 {
@@ -774,7 +769,6 @@ static struct ttm_bo_driver radeon_bo_driver = {
 	.ttm_tt_create = &radeon_ttm_tt_create,
 	.ttm_tt_populate = &radeon_ttm_tt_populate,
 	.ttm_tt_unpopulate = &radeon_ttm_tt_unpopulate,
-	.invalidate_caches = &radeon_invalidate_caches,
 	.init_mem_type = &radeon_init_mem_type,
 	.eviction_valuable = ttm_bo_eviction_valuable,
 	.evict_flags = &radeon_evict_flags,

drivers/gpu/drm/ttm/ttm_bo.c

@@ -372,14 +372,7 @@ static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 	}
 
 moved:
-	if (bo->evicted) {
-		if (bdev->driver->invalidate_caches) {
-			ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
-			if (ret)
-				pr_err("Can not flush read caches\n");
-		}
 	bo->evicted = false;
-	}
 
 	if (bo->mem.mm_node)
 		bo->offset = (bo->mem.start << PAGE_SHIFT) +

drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c

@@ -736,11 +736,6 @@ static struct ttm_tt *vmw_ttm_tt_create(struct ttm_buffer_object *bo,
 	return NULL;
 }
 
-static int vmw_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
-{
-	return 0;
-}
-
 static int vmw_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 		      struct ttm_mem_type_manager *man)
 {
@@ -866,7 +861,6 @@ struct ttm_bo_driver vmw_bo_driver = {
 	.ttm_tt_create = &vmw_ttm_tt_create,
 	.ttm_tt_populate = &vmw_ttm_populate,
 	.ttm_tt_unpopulate = &vmw_ttm_unpopulate,
-	.invalidate_caches = vmw_invalidate_caches,
 	.init_mem_type = vmw_init_mem_type,
 	.eviction_valuable = ttm_bo_eviction_valuable,
 	.evict_flags = vmw_evict_flags,

include/drm/ttm/ttm_bo_driver.h

@@ -210,8 +210,6 @@ struct ttm_mem_type_manager {
  * struct ttm_bo_driver
  *
  * @create_ttm_backend_entry: Callback to create a struct ttm_backend.
- * @invalidate_caches: Callback to invalidate read caches when a buffer object
- * has been evicted.
  * @init_mem_type: Callback to initialize a struct ttm_mem_type_manager
  * structure.
  * @evict_flags: Callback to obtain placement flags when a buffer is evicted.
@@ -256,19 +254,6 @@ struct ttm_bo_driver {
 	 */
 	void (*ttm_tt_unpopulate)(struct ttm_tt *ttm);
 
-	/**
-	 * struct ttm_bo_driver member invalidate_caches
-	 *
-	 * @bdev: the buffer object device.
-	 * @flags: new placement of the rebound buffer object.
-	 *
-	 * A previosly evicted buffer has been rebound in a
-	 * potentially new location. Tell the driver that it might
-	 * consider invalidating read (texture) caches on the next command
-	 * submission as a consequence.
-	 */
-
-	int (*invalidate_caches)(struct ttm_bo_device *bdev, uint32_t flags);
 	int (*init_mem_type)(struct ttm_bo_device *bdev, uint32_t type,
 			     struct ttm_mem_type_manager *man);