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[v5,5/5,media] s5p-mfc: Set DMA_ATTR_NO_HUGE_PAGE

Message ID 1452294332-23415-6-git-send-email-dianders@chromium.org (mailing list archive)
State New, archived
Headers show

Commit Message

Douglas Anderson Jan. 8, 2016, 11:05 p.m. UTC 
We do video allocation all the time and we need it to be fast.  Plus TLB
efficiency isn't terribly important for video.

That means we want to set DMA_ATTR_NO_HUGE_PAGE.

See also the previous change ("ARM: dma-mapping: Use
DMA_ATTR_NO_HUGE_PAGE hint to optimize allocation").

Signed-off-by: Douglas Anderson <dianders@chromium.org>
---
Changes in v5:
- s5p-mfc patch new for v5

Changes in v4: None
Changes in v3: None
Changes in v2: None

 drivers/media/platform/s5p-mfc/s5p_mfc.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)
diff mbox

Patch

diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc.c b/drivers/media/platform/s5p-mfc/s5p_mfc.c
index 927ab4928779..7ea5d0d262bb 100644
--- a/drivers/media/platform/s5p-mfc/s5p_mfc.c
+++ b/drivers/media/platform/s5p-mfc/s5p_mfc.c
@@ -1095,6 +1095,7 @@  static int s5p_mfc_alloc_memdevs(struct s5p_mfc_dev *dev)
 /* MFC probe function */
 static int s5p_mfc_probe(struct platform_device *pdev)
 {
+	DEFINE_DMA_ATTRS(attrs);
 	struct s5p_mfc_dev *dev;
 	struct video_device *vfd;
 	struct resource *res;
@@ -1164,12 +1165,20 @@  static int s5p_mfc_probe(struct platform_device *pdev)
 		}
 	}
 
-	dev->alloc_ctx[0] = vb2_dma_contig_init_ctx(dev->mem_dev_l);
+	/*
+	 * We'll do mostly sequential access, so sacrifice TLB efficiency for
+	 * faster allocation.
+	 */
+	dma_set_attr(DMA_ATTR_NO_HUGE_PAGE, &attrs);
+
+	dev->alloc_ctx[0] = vb2_dma_contig_init_ctx_attrs(dev->mem_dev_l,
+							  &attrs);
 	if (IS_ERR(dev->alloc_ctx[0])) {
 		ret = PTR_ERR(dev->alloc_ctx[0]);
 		goto err_res;
 	}
-	dev->alloc_ctx[1] = vb2_dma_contig_init_ctx(dev->mem_dev_r);
+	dev->alloc_ctx[1] = vb2_dma_contig_init_ctx_attrs(dev->mem_dev_r,
+							  &attrs);
 	if (IS_ERR(dev->alloc_ctx[1])) {
 		ret = PTR_ERR(dev->alloc_ctx[1]);
 		goto err_mem_init_ctx_1;