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_ALLOC_SINGLE_PAGES.
See also the previous change ("ARM: dma-mapping: Use
DMA_ATTR_ALLOC_SINGLE_PAGES hint to optimize allocation").
Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
---
Changes in v6:
- renamed DMA_ATTR_NO_HUGE_PAGE to DMA_ATTR_ALLOC_SINGLE_PAGES
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 --git a/drivers/media/platform/s5p-mfc/s5p_mfc.c b/drivers/media/platform/s5p-mfc/s5p_mfc.c
index 927ab4928779..421d25a1aec1 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_ALLOC_SINGLE_PAGES, &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;
--
2.6.0.rc2.230.g3dd15c0
--
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