Hi, Since dma_buf is merged at v3.3-rc, I hope to merge this one also at this merge window. Now it's tested at OMAP. also it's used at exynos but not yet fully tested. Thank you, Kyungmin Park On 1/5/12, Sumit Semwal <sumit.semwal@xxxxxx> wrote: > Hello Everyone, > > A very happy new year 2012! :) > > This patchset is an RFC for the way videobuf2 can be adapted to add support > for > DMA buffer sharing framework[1]. > > The original patch-set for the idea, and PoC of buffer sharing was by > Tomasz Stanislawski <t.stanislaws@xxxxxxxxxxx>, who demonstrated buffer > sharing > between two v4l2 devices[2]. This RFC is needed to adapt these patches to > the > changes that have happened in the DMA buffer sharing framework over past few > months. > > To begin with, I have tried to adapt only the dma-contig allocator, and only > as > a user of dma-buf buffer. I am currently working on the v4l2-as-an-exporter > changes, and will share as soon as I get it in some shape. > > As with the PoC [2], the handle for sharing buffers is a file-descriptor > (fd). > The usage documentation is also a part of [1]. > > So, the current RFC has the following limitations: > - Only buffer sharing as a buffer user, > - doesn't handle cases where even for a contiguous buffer, the sg_table can > have > more than one scatterlist entry. > > > Thanks and best regards, > ~Sumit. > > [1]: dma-buf patchset at: https://lkml.org/lkml/2011/12/26/29 > [2]: http://lwn.net/Articles/454389 > > Sumit Semwal (4): > v4l: Add DMABUF as a memory type > v4l:vb2: add support for shared buffer (dma_buf) > v4l:vb: remove warnings about MEMORY_DMABUF > v4l:vb2: Add dma-contig allocator as dma_buf user > > drivers/media/video/videobuf-core.c | 4 + > drivers/media/video/videobuf2-core.c | 186 > +++++++++++++++++++++++++++- > drivers/media/video/videobuf2-dma-contig.c | 125 +++++++++++++++++++ > include/linux/videodev2.h | 8 ++ > include/media/videobuf2-core.h | 30 +++++ > 5 files changed, 352 insertions(+), 1 deletions(-) > > -- > 1.7.5.4 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-media" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
