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path: root/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
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Diffstat (limited to 'drivers/gpu/drm/ttm/ttm_page_alloc_dma.c')
-rw-r--r--drivers/gpu/drm/ttm/ttm_page_alloc_dma.c51
1 files changed, 32 insertions, 19 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
index b8b394319b45..7957beeeaf73 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
@@ -918,19 +918,6 @@ int ttm_dma_populate(struct ttm_dma_tt *ttm_dma, struct device *dev)
}
EXPORT_SYMBOL_GPL(ttm_dma_populate);
-/* Get good estimation how many pages are free in pools */
-static int ttm_dma_pool_get_num_unused_pages(void)
-{
- struct device_pools *p;
- unsigned total = 0;
-
- mutex_lock(&_manager->lock);
- list_for_each_entry(p, &_manager->pools, pools)
- total += p->pool->npages_free;
- mutex_unlock(&_manager->lock);
- return total;
-}
-
/* Put all pages in pages list to correct pool to wait for reuse */
void ttm_dma_unpopulate(struct ttm_dma_tt *ttm_dma, struct device *dev)
{
@@ -1002,18 +989,29 @@ EXPORT_SYMBOL_GPL(ttm_dma_unpopulate);
/**
* Callback for mm to request pool to reduce number of page held.
+ *
+ * XXX: (dchinner) Deadlock warning!
+ *
+ * ttm_dma_page_pool_free() does GFP_KERNEL memory allocation, and so attention
+ * needs to be paid to sc->gfp_mask to determine if this can be done or not.
+ * GFP_KERNEL memory allocation in a GFP_ATOMIC reclaim context woul dbe really
+ * bad.
+ *
+ * I'm getting sadder as I hear more pathetical whimpers about needing per-pool
+ * shrinkers
*/
-static int ttm_dma_pool_mm_shrink(struct shrinker *shrink,
- struct shrink_control *sc)
+static unsigned long
+ttm_dma_pool_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
{
static atomic_t start_pool = ATOMIC_INIT(0);
unsigned idx = 0;
unsigned pool_offset = atomic_add_return(1, &start_pool);
unsigned shrink_pages = sc->nr_to_scan;
struct device_pools *p;
+ unsigned long freed = 0;
if (list_empty(&_manager->pools))
- return 0;
+ return SHRINK_STOP;
mutex_lock(&_manager->lock);
pool_offset = pool_offset % _manager->npools;
@@ -1029,18 +1027,33 @@ static int ttm_dma_pool_mm_shrink(struct shrinker *shrink,
continue;
nr_free = shrink_pages;
shrink_pages = ttm_dma_page_pool_free(p->pool, nr_free);
+ freed += nr_free - shrink_pages;
+
pr_debug("%s: (%s:%d) Asked to shrink %d, have %d more to go\n",
p->pool->dev_name, p->pool->name, current->pid,
nr_free, shrink_pages);
}
mutex_unlock(&_manager->lock);
- /* return estimated number of unused pages in pool */
- return ttm_dma_pool_get_num_unused_pages();
+ return freed;
+}
+
+static unsigned long
+ttm_dma_pool_shrink_count(struct shrinker *shrink, struct shrink_control *sc)
+{
+ struct device_pools *p;
+ unsigned long count = 0;
+
+ mutex_lock(&_manager->lock);
+ list_for_each_entry(p, &_manager->pools, pools)
+ count += p->pool->npages_free;
+ mutex_unlock(&_manager->lock);
+ return count;
}
static void ttm_dma_pool_mm_shrink_init(struct ttm_pool_manager *manager)
{
- manager->mm_shrink.shrink = &ttm_dma_pool_mm_shrink;
+ manager->mm_shrink.count_objects = ttm_dma_pool_shrink_count;
+ manager->mm_shrink.scan_objects = &ttm_dma_pool_shrink_scan;
manager->mm_shrink.seeks = 1;
register_shrinker(&manager->mm_shrink);
}