drm/ttm: add ttm_tt_populate wrapper

Stop calling the driver callback directly.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Roger He <Hongbo.He@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/ttm/ttm_bo_util.c

@@ -375,8 +375,8 @@ int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
 	/*
 	 * TTM might be null for moves within the same region.
 	 */
-	if (ttm && ttm->state == tt_unpopulated) {
-		ret = ttm->bdev->driver->ttm_tt_populate(ttm, ctx);
+	if (ttm) {
+		ret = ttm_tt_populate(ttm, ctx);
 		if (ret)
 			goto out1;
 	}
@@ -557,11 +557,9 @@ static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
 
 	BUG_ON(!ttm);
 
-	if (ttm->state == tt_unpopulated) {
-		ret = ttm->bdev->driver->ttm_tt_populate(ttm, &ctx);
+	ret = ttm_tt_populate(ttm, &ctx);
 	if (ret)
 		return ret;
-	}
 
 	if (num_pages == 1 && (mem->placement & TTM_PL_FLAG_CACHED)) {
 		/*

drivers/gpu/drm/ttm/ttm_bo_vm.c

@@ -234,7 +234,7 @@ static int ttm_bo_vm_fault(struct vm_fault *vmf)
 						cvma.vm_page_prot);
 
 		/* Allocate all page at once, most common usage */
-		if (ttm->bdev->driver->ttm_tt_populate(ttm, &ctx)) {
+		if (ttm_tt_populate(ttm, &ctx)) {
 			ret = VM_FAULT_OOM;
 			goto out_io_unlock;
 		}

drivers/gpu/drm/ttm/ttm_tt.c

@@ -276,7 +276,7 @@ int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem,
 	if (ttm->state == tt_bound)
 		return 0;
 
-	ret = ttm->bdev->driver->ttm_tt_populate(ttm, ctx);
+	ret = ttm_tt_populate(ttm, ctx);
 	if (ret)
 		return ret;
 
@@ -392,6 +392,14 @@ int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistent_swap_storage)
 	return ret;
 }
 
+int ttm_tt_populate(struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
+{
+	if (ttm->state != tt_unpopulated)
+		return 0;
+
+	return ttm->bdev->driver->ttm_tt_populate(ttm, ctx);
+}
+
 static void ttm_tt_clear_mapping(struct ttm_tt *ttm)
 {
 	pgoff_t i;

include/drm/ttm/ttm_bo_driver.h

@@ -700,6 +700,15 @@ int ttm_tt_swapin(struct ttm_tt *ttm);
 int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement);
 int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistent_swap_storage);
 
+/**
+ * ttm_tt_populate - allocate pages for a ttm
+ *
+ * @ttm: Pointer to the ttm_tt structure
+ *
+ * Calls the driver method to allocate pages for a ttm
+ */
+int ttm_tt_populate(struct ttm_tt *ttm, struct ttm_operation_ctx *ctx);
+
 /**
  * ttm_tt_unpopulate - free pages from a ttm
  *