Messages in this thread |  | | | Subject | Re: [PATCH 1/3] dmaengine: add new dma API for max_segment_number | | From | "Koul, Vinod" <> | | Date | Mon, 06 Jun 2011 10:58:38 +0530 |
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On Sun, 2011-06-05 at 10:30 +0900, FUJITA Tomonori wrote: > On Wed, 1 Jun 2011 10:33:57 +0800 > Shawn Guo <shawn.guo@freescale.com> wrote: > > > 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(-) > > include/linux/dma-mapping.h is for DMA mapping API (please see > Documentation/DMA-API*.txt). > > What does dma_set(get)_max_seg_size do? And it's related with DMA > mapping API? See the other post by author
> > > > > > > > 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 > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > > the body of a message to majordomo@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > Please read the FAQ at http://www.tux.org/lkml/ > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
-- ~Vinod
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