Messages in this thread Patch in this message | | | From | Shawn Guo <> | Subject | [PATCH 1/3] dmaengine: add new dma API for max_segment_number | Date | Thu, 26 May 2011 14:31:31 +0800 |
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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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