This API can set a flag whether a device requires iova contiguous
strictly.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda...@renesas.com>
---
include/linux/device.h | 1 +
include/linux/dma-mapping.h | 16 ++++++++++++++++
2 files changed, 17 insertions(+)
diff --git a/include/linux/device.h b/include/linux/device.h
index e85264f..a33d611 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -752,6 +752,7 @@ struct device_dma_parameters {
*/
unsigned int max_segment_size;
unsigned long segment_boundary_mask;
+ bool iova_contiguous;
};
/**
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 6309a72..cdb4e75 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -729,6 +729,22 @@ static inline int dma_set_seg_boundary(struct device *dev,
unsigned long mask)
return -EIO;
}
+static inline int dma_get_iova_contiguous(struct device *dev)
+{
+ if (dev->dma_parms)
+ return dev->dma_parms->iova_contiguous;
+ return false;
+}
+
+static inline int dma_set_iova_contiguous(struct device *dev, bool contiguous)
+{
+ if (dev->dma_parms) {
+ dev->dma_parms->iova_contiguous = contiguous;
+ return 0;
+ }
+ return -EIO;
+}
+
#ifndef dma_max_pfn
static inline unsigned long dma_max_pfn(struct device *dev)
{
--
2.7.4
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