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Subject[PATCH 1/3] dmaengine: add new dma API for max_segment_number
Date
Like dma_set(get)_max_seg_size for max_segment_size, the patch adds
max_segment_number into device_dma_parameters and creates the
corresponding dmaengine API dma_set(get)_max_seg_number for it.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
---
include/linux/device.h | 1 +
include/linux/dma-mapping.h | 15 +++++++++++++++
2 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/include/linux/device.h b/include/linux/device.h
index c66111a..44cb2528 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -487,6 +487,7 @@ struct device_dma_parameters {
* sg limitations.
*/
unsigned int max_segment_size;
+ unsigned int max_segment_number;
unsigned long segment_boundary_mask;
};

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index ba8319a..fd314f4 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -131,6 +131,21 @@ static inline unsigned int dma_set_max_seg_size(struct device *dev,
return -EIO;
}

+static inline unsigned int dma_get_max_seg_number(struct device *dev)
+{
+ return dev->dma_parms ? dev->dma_parms->max_segment_number : 1;
+}
+
+static inline unsigned int dma_set_max_seg_number(struct device *dev,
+ unsigned int number)
+{
+ if (dev->dma_parms) {
+ dev->dma_parms->max_segment_number = number;
+ return 0;
+ } else
+ return -EIO;
+}
+
static inline unsigned long dma_get_seg_boundary(struct device *dev)
{
return dev->dma_parms ?
--
1.7.4.1



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