---

yaml
---
r: 282734
b: refs/heads/master
c: 2c05114
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 36d7c537c3082a492ff851fb0da40ae3d7c5565d
+refs/heads/master: 2c05114d23c4fd2256eaf5645528c19fcefdb2c8

trunk/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c

@@ -949,7 +949,7 @@ void ttm_dma_unpopulate(struct ttm_dma_tt *ttm_dma, struct device *dev)
 	struct dma_page *d_page, *next;
 	enum pool_type type;
 	bool is_cached = false;
-	unsigned count = 0, i;
+	unsigned count = 0, i, npages = 0;
 	unsigned long irq_flags;
 
 	type = ttm_to_type(ttm->page_flags, ttm->caching_state);
@@ -974,8 +974,13 @@ void ttm_dma_unpopulate(struct ttm_dma_tt *ttm_dma, struct device *dev)
 	} else {
 		pool->npages_free += count;
 		list_splice(&ttm_dma->pages_list, &pool->free_list);
+		npages = count;
 		if (pool->npages_free > _manager->options.max_size) {
-			count = pool->npages_free - _manager->options.max_size;
+			npages = pool->npages_free - _manager->options.max_size;
+			/* free at least NUM_PAGES_TO_ALLOC number of pages
+			 * to reduce calls to set_memory_wb */
+			if (npages < NUM_PAGES_TO_ALLOC)
+				npages = NUM_PAGES_TO_ALLOC;
 		}
 	}
 	spin_unlock_irqrestore(&pool->lock, irq_flags);
@@ -999,9 +1004,9 @@ void ttm_dma_unpopulate(struct ttm_dma_tt *ttm_dma, struct device *dev)
 		ttm_dma->dma_address[i] = 0;
 	}
 
-	/* shrink pool if necessary */
-	if (count)
-		ttm_dma_page_pool_free(pool, count);
+	/* shrink pool if necessary (only on !is_cached pools)*/
+	if (npages)
+		ttm_dma_page_pool_free(pool, npages);
 	ttm->state = tt_unpopulated;
 }
 EXPORT_SYMBOL_GPL(ttm_dma_unpopulate);