Add support for configuring dma mapping attributes when mapping
and unmapping memory through dma_buf_map_attachment and
dma_buf_unmap_attachment.
For example this will allow ION clients to skip cache maintenance, by
using DMA_ATTR_SKIP_CPU_SYNC, for buffers which are clean and haven't been
accessed by the CPU.
Signed-off-by: Liam Mark <lmark@xxxxxxxxxxxxxx>
---
drivers/staging/android/ion/ion.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index 1fe633a7fdba..0aae845b20ba 100644
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -268,8 +268,8 @@ static struct sg_table *ion_map_dma_buf(struct dma_buf_attachment *attachment,
table = a->table;
mutex_lock(&buffer->lock);
- if (!dma_map_sg(attachment->dev, table->sgl, table->nents,
- direction)) {
+ if (!dma_map_sg_attrs(attachment->dev, table->sgl, table->nents,
+ direction, attachment->dma_map_attrs)) {
mutex_unlock(&buffer->lock);
return ERR_PTR(-ENOMEM);
}
@@ -287,7 +287,8 @@ static void ion_unmap_dma_buf(struct dma_buf_attachment *attachment,
struct ion_buffer *buffer = attachment->dmabuf->priv;
mutex_lock(&buffer->lock);
- dma_unmap_sg(attachment->dev, table->sgl, table->nents, direction);
+ dma_unmap_sg_attrs(attachment->dev, table->sgl, table->nents, direction,
+ attachment->dma_map_attrs);
a->dma_mapped = false;
mutex_unlock(&buffer->lock);
}
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
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