Messages in this thread | | | Date | Wed, 1 Jun 2011 10:33:57 +0800 | From | Shawn Guo <> | Subject | Re: [PATCH 1/3] dmaengine: add new dma API for max_segment_number |
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Hi Vinod,
Thoughts?
-- Regards, Shawn
On Thu, May 26, 2011 at 02:31:31PM +0800, Shawn Guo wrote: > 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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