Adding upstream version 6.7.7.upstream/6.7.7

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 32 insertions, 10 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c
index cddb9151d2..dbc96984d3 100644
--- a/drivers/gpu/drm/ttm/ttm_pool.c
+++ b/drivers/gpu/drm/ttm/ttm_pool.c
@@ -73,7 +73,8 @@ static struct ttm_pool_type global_dma32_uncached[MAX_ORDER + 1];
 
 static spinlock_t shrinker_lock;
 static struct list_head shrinker_list;
-static struct shrinker mm_shrinker;
+static struct shrinker *mm_shrinker;
+static DECLARE_RWSEM(pool_shrink_rwsem);
 
 /* Allocate pages of size 1 << order with the given gfp_flags */
 static struct page *ttm_pool_alloc_page(struct ttm_pool *pool, gfp_t gfp_flags,
@@ -317,6 +318,7 @@ static unsigned int ttm_pool_shrink(void)
 	unsigned int num_pages;
 	struct page *p;
 
+	down_read(&pool_shrink_rwsem);
 	spin_lock(&shrinker_lock);
 	pt = list_first_entry(&shrinker_list, typeof(*pt), shrinker_list);
 	list_move_tail(&pt->shrinker_list, &shrinker_list);
@@ -329,6 +331,7 @@ static unsigned int ttm_pool_shrink(void)
 	} else {
 		num_pages = 0;
 	}
+	up_read(&pool_shrink_rwsem);
 
 	return num_pages;
 }
@@ -384,7 +387,7 @@ static void ttm_pool_free_range(struct ttm_pool *pool, struct ttm_tt *tt,
 				enum ttm_caching caching,
 				pgoff_t start_page, pgoff_t end_page)
 {
-	struct page **pages = tt->pages;
+	struct page **pages = &tt->pages[start_page];
 	unsigned int order;
 	pgoff_t i, nr;
 
@@ -573,6 +576,18 @@ void ttm_pool_init(struct ttm_pool *pool, struct device *dev,
 EXPORT_SYMBOL(ttm_pool_init);
 
 /**
+ * ttm_pool_synchronize_shrinkers - Wait for all running shrinkers to complete.
+ *
+ * This is useful to guarantee that all shrinker invocations have seen an
+ * update, before freeing memory, similar to rcu.
+ */
+static void ttm_pool_synchronize_shrinkers(void)
+{
+	down_write(&pool_shrink_rwsem);
+	up_write(&pool_shrink_rwsem);
+}
+
+/**
  * ttm_pool_fini - Cleanup a pool
  *
  * @pool: the pool to clean up
@@ -593,7 +608,7 @@ void ttm_pool_fini(struct ttm_pool *pool)
 	/* We removed the pool types from the LRU, but we need to also make sure
 	 * that no shrinker is concurrently freeing pages from the pool.
 	 */
-	synchronize_shrinkers();
+	ttm_pool_synchronize_shrinkers();
 }
 EXPORT_SYMBOL(ttm_pool_fini);
 
@@ -734,8 +749,8 @@ static int ttm_pool_debugfs_shrink_show(struct seq_file *m, void *data)
 	struct shrink_control sc = { .gfp_mask = GFP_NOFS };
 
 	fs_reclaim_acquire(GFP_KERNEL);
-	seq_printf(m, "%lu/%lu\n", ttm_pool_shrinker_count(&mm_shrinker, &sc),
-		   ttm_pool_shrinker_scan(&mm_shrinker, &sc));
+	seq_printf(m, "%lu/%lu\n", ttm_pool_shrinker_count(mm_shrinker, &sc),
+		   ttm_pool_shrinker_scan(mm_shrinker, &sc));
 	fs_reclaim_release(GFP_KERNEL);
 
 	return 0;
@@ -779,10 +794,17 @@ int ttm_pool_mgr_init(unsigned long num_pages)
 			    &ttm_pool_debugfs_shrink_fops);
 #endif
 
-	mm_shrinker.count_objects = ttm_pool_shrinker_count;
-	mm_shrinker.scan_objects = ttm_pool_shrinker_scan;
-	mm_shrinker.seeks = 1;
-	return register_shrinker(&mm_shrinker, "drm-ttm_pool");
+	mm_shrinker = shrinker_alloc(0, "drm-ttm_pool");
+	if (!mm_shrinker)
+		return -ENOMEM;
+
+	mm_shrinker->count_objects = ttm_pool_shrinker_count;
+	mm_shrinker->scan_objects = ttm_pool_shrinker_scan;
+	mm_shrinker->seeks = 1;
+
+	shrinker_register(mm_shrinker);
+
+	return 0;
 }
 
 /**
@@ -802,6 +824,6 @@ void ttm_pool_mgr_fini(void)
 		ttm_pool_type_fini(&global_dma32_uncached[i]);
 	}
 
-	unregister_shrinker(&mm_shrinker);
+	shrinker_free(mm_shrinker);
 	WARN_ON(!list_empty(&shrinker_list));
 }