drm/ttm: move swapout logic around v3

[linux-2.6-microblaze.git] / drivers / gpu / drm / ttm / ttm_device.c

diff --git a/drivers/gpu/drm/ttm/ttm_device.c b/drivers/gpu/drm/ttm/ttm_device.c
index 95e1b7b..b142418 100644 (file)
--- a/drivers/gpu/drm/ttm/ttm_device.c
+++ b/drivers/gpu/drm/ttm/ttm_device.c
@@ -102,6 +102,35 @@ out:
        return ret;
 }
 
+/**
+ * A buffer object shrink method that tries to swap out the first
+ * buffer object on the global::swap_lru list.
+ */
+int ttm_global_swapout(struct ttm_operation_ctx *ctx, gfp_t gfp_flags)
+{
+       struct ttm_global *glob = &ttm_glob;
+       struct ttm_buffer_object *bo;
+       unsigned i;
+       int ret;
+
+       spin_lock(&glob->lru_lock);
+       for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
+               list_for_each_entry(bo, &glob->swap_lru[i], swap) {
+                       uint32_t num_pages = bo->ttm->num_pages;
+
+                       ret = ttm_bo_swapout(bo, ctx, gfp_flags);
+                       /* ttm_bo_swapout has dropped the lru_lock */
+                       if (!ret)
+                               return num_pages;
+                       if (ret != -EBUSY)
+                               return ret;
+               }
+       }
+       spin_unlock(&glob->lru_lock);
+       return 0;
+}
+EXPORT_SYMBOL(ttm_global_swapout);
+
 static void ttm_init_sysman(struct ttm_device *bdev)
 {
        struct ttm_resource_manager *man = &bdev->sysman;