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@ti.com 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@samsung.com, 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
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