On Thu, 2016-03-03 at 09:44 -0800, Doug Anderson wrote: > Hi, > > On Wed, Mar 2, 2016 at 10:54 AM, Yong Wu <yong...@mediatek.com> wrote: > > Sometimes it is not worth for the iommu allocating big chunks. > > Here we enable DMA_ATTR_ALLOC_SINGLE_PAGES which could help avoid to > > allocate big chunks while iommu allocating buffer. > > > > More information about this attribute, please check Doug's commit[1]. > > > > [1]: https://lkml.org/lkml/2016/1/11/720 > > > > Cc: Robin Murphy <robin.mur...@arm.com> > > Suggested-by: Douglas Anderson <diand...@chromium.org> > > Signed-off-by: Yong Wu <yong...@mediatek.com> > > --- > > > > Our video drivers may soon use this. > > > > arch/arm64/mm/dma-mapping.c | 4 ++-- > > drivers/iommu/dma-iommu.c | 14 ++++++++++---- > > include/linux/dma-iommu.h | 4 ++-- > > 3 files changed, 14 insertions(+), 8 deletions(-) > > It should also be mentioned that this depends on commit df05c6f6e0bb > ("ARM: 8506/1: common: DMA-mapping: add DMA_ATTR_ALLOC_SINGLE_PAGES > attribute") which is not in mainline quite yet.
Thanks. I will add it in the commit message. > > Also please CC Marek Szyprowski on any future patches in this area > since I saw a patch series from him that was touching this same area. Will do. > > Reviewed-by: Douglas Anderson <diand...@chromium.org> Thanks.
