[PATCH 4/4] drm/ttm: optimize ttm pool shrinker a bit

["Christian König" <ckoenig.leichtzumerken@gmail.com>]

Only initialize the DMA coherent pools if they are used.

Signed-off-by: Christian König <christian.koenig@amd.com>
---
 drivers/gpu/drm/ttm/ttm_pool.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c
index 1cdacd58753a..f09e34614226 100644
--- a/drivers/gpu/drm/ttm/ttm_pool.c
+++ b/drivers/gpu/drm/ttm/ttm_pool.c
@@ -504,10 +504,12 @@ void ttm_pool_init(struct ttm_pool *pool, struct device *dev,
 	pool->use_dma_alloc = use_dma_alloc;
 	pool->use_dma32 = use_dma32;
 
-	for (i = 0; i < TTM_NUM_CACHING_TYPES; ++i)
-		for (j = 0; j < MAX_ORDER; ++j)
-			ttm_pool_type_init(&pool->caching[i].orders[j],
-					   pool, i, j);
+	if (use_dma_alloc) {
+		for (i = 0; i < TTM_NUM_CACHING_TYPES; ++i)
+			for (j = 0; j < MAX_ORDER; ++j)
+				ttm_pool_type_init(&pool->caching[i].orders[j],
+						   pool, i, j);
+	}
 }
 EXPORT_SYMBOL(ttm_pool_init);
 
@@ -523,9 +525,11 @@ void ttm_pool_fini(struct ttm_pool *pool)
 {
 	unsigned int i, j;
 
-	for (i = 0; i < TTM_NUM_CACHING_TYPES; ++i)
-		for (j = 0; j < MAX_ORDER; ++j)
-			ttm_pool_type_fini(&pool->caching[i].orders[j]);
+	if (pool->use_dma_alloc) {
+		for (i = 0; i < TTM_NUM_CACHING_TYPES; ++i)
+			for (j = 0; j < MAX_ORDER; ++j)
+				ttm_pool_type_fini(&pool->caching[i].orders[j]);
+	}
 }
 EXPORT_SYMBOL(ttm_pool_fini);
 
@@ -630,6 +634,11 @@ int ttm_pool_debugfs(struct ttm_pool *pool, struct seq_file *m)
 {
 	unsigned int i;
 
+	if (!pool->use_dma_alloc) {
+		seq_puts(m, "unused\n");
+		return 0;
+	}
+
 	ttm_pool_debugfs_header(m);
 
 	spin_lock(&shrinker_lock);
-- 
2.25.1

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