I have a system where the data is planar, but the kernel drivers
expect to get one allocation with offsets for the planes. I can't
figure out how to do that with the current dma_buf implementation. I
thought I could pass the same dma_buf several times and use the
data_offset field of the v4l2_plane struct but it looks like that's
only for output. Am I missing something? Is this supported?
Thanks,
Rebecca
On Wed, May 30, 2012 at 8:26 AM, Semwal, Sumit <sumit.semwal@xxxxxx> wrote:
> On Tue, May 29, 2012 at 6:25 AM, Laurent Pinchart
> <laurent.pinchart@xxxxxxxxxxxxxxxx> wrote:
>> Hi Tomasz,
> Hi Tomasz, Laurent, Mauro,
>>
>> On Wednesday 23 May 2012 14:10:14 Tomasz Stanislawski wrote:
>>> Hello everyone,
>>> This patchset adds support for DMABUF [2] importing to V4L2 stack.
>>> The support for DMABUF exporting was moved to separate patchset
>>> due to dependency on patches for DMA mapping redesign by
>>> Marek Szyprowski [4].
>>
>> Except for the small issue with patches 01/13 and 02/13, the set is ready for
>> upstream as far as I'm concerned.
> +1; Mauro: how do you think about this series? Getting it landed into
> 3.5 would make life lot easier :)
>>
>>> v6:
>>> - fixed missing entry in v4l2_memory_names
>>> - fixed a bug occuring after get_user_pages failure
>>
>> I've missed that one, what was it ?
>>
>>> - fixed a bug caused by using invalid vma for get_user_pages
>>> - prepare/finish no longer call dma_sync for dmabuf buffers
>>>
>>> v5:
>>> - removed change of importer/exporter behaviour
>>> - fixes vb2_dc_pages_to_sgt basing on Laurent's hints
>>> - changed pin/unpin words to lock/unlock in Doc
>>>
>>> v4:
>>> - rebased on mainline 3.4-rc2
>>> - included missing importing support for s5p-fimc and s5p-tv
>>> - added patch for changing map/unmap for importers
>>> - fixes to Documentation part
>>> - coding style fixes
>>> - pairing {map/unmap}_dmabuf in vb2-core
>>> - fixing variable types and semantic of arguments in videobufb2-dma-contig.c
>>>
>>> v3:
>>> - rebased on mainline 3.4-rc1
>>> - split 'code refactor' patch to multiple smaller patches
>>> - squashed fixes to Sumit's patches
>>> - patchset is no longer dependant on 'DMA mapping redesign'
>>> - separated path for handling IO and non-IO mappings
>>> - add documentation for DMABUF importing to V4L
>>> - removed all DMABUF exporter related code
>>> - removed usage of dma_get_pages extension
>>>
>>> v2:
>>> - extended VIDIOC_EXPBUF argument from integer memoffset to struct
>>> v4l2_exportbuffer
>>> - added patch that breaks DMABUF spec on (un)map_atachment callcacks but
>>> allows to work with existing implementation of DMABUF prime in DRM
>>> - all dma-contig code refactoring patches were squashed
>>> - bugfixes
>>>
>>> v1: List of changes since [1].
>>> - support for DMA api extension dma_get_pages, the function is used to
>>> retrieve pages used to create DMA mapping.
>>> - small fixes/code cleanup to videobuf2
>>> - added prepare and finish callbacks to vb2 allocators, it is used keep
>>> consistency between dma-cpu acess to the memory (by Marek Szyprowski)
>>> - support for exporting of DMABUF buffer in V4L2 and Videobuf2, originated
>>> from [3].
>>> - support for dma-buf exporting in vb2-dma-contig allocator
>>> - support for DMABUF for s5p-tv and s5p-fimc (capture interface) drivers,
>>> originated from [3]
>>> - changed handling for userptr buffers (by Marek Szyprowski, Andrzej
>>> Pietrasiewicz)
>>> - let mmap method to use dma_mmap_writecombine call (by Marek Szyprowski)
>>>
>>> [1]
>>> http://thread.gmane.org/gmane.linux.drivers.video-input-infrastructure/4296
>>> 6/focus=42968 [2] https://lkml.org/lkml/2011/12/26/29
>>> [3]
>>> http://thread.gmane.org/gmane.linux.drivers.video-input-infrastructure/3635
>>> 4/focus=36355 [4]
>>> http://thread.gmane.org/gmane.linux.kernel.cross-arch/12819
>>>
>>> Laurent Pinchart (2):
>>> v4l: vb2-dma-contig: Shorten vb2_dma_contig prefix to vb2_dc
>>> v4l: vb2-dma-contig: Reorder functions
>>>
>>> Marek Szyprowski (2):
>>> v4l: vb2: add prepare/finish callbacks to allocators
>>> v4l: vb2-dma-contig: add prepare/finish to dma-contig allocator
>>>
>>> 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-dma-contig: add support for dma_buf importing
>>>
>>> Tomasz Stanislawski (5):
>>> Documentation: media: description of DMABUF importing in V4L2
>>> v4l: vb2-dma-contig: Remove unneeded allocation context structure
>>> v4l: vb2-dma-contig: add support for scatterlist in userptr mode
>>> v4l: s5p-tv: mixer: support for dmabuf importing
>>> v4l: s5p-fimc: support for dmabuf importing
>>>
>>> Documentation/DocBook/media/v4l/compat.xml | 4 +
>>> Documentation/DocBook/media/v4l/io.xml | 179 +++++++
>>> .../DocBook/media/v4l/vidioc-create-bufs.xml | 1 +
>>> Documentation/DocBook/media/v4l/vidioc-qbuf.xml | 15 +
>>> Documentation/DocBook/media/v4l/vidioc-reqbufs.xml | 45 +-
>>> drivers/media/video/s5p-fimc/Kconfig | 1 +
>>> drivers/media/video/s5p-fimc/fimc-capture.c | 2 +-
>>> drivers/media/video/s5p-tv/Kconfig | 1 +
>>> drivers/media/video/s5p-tv/mixer_video.c | 2 +-
>>> drivers/media/video/v4l2-ioctl.c | 1 +
>>> drivers/media/video/videobuf-core.c | 4 +
>>> drivers/media/video/videobuf2-core.c | 207 +++++++-
>>> drivers/media/video/videobuf2-dma-contig.c | 520 ++++++++++++++---
>>> include/linux/videodev2.h | 7 +
>>> include/media/videobuf2-core.h | 34 ++
>>> 15 files changed, 924 insertions(+), 99 deletions(-)
>> --
>> Regards,
>>
>> Laurent Pinchart
>>
> Best regards,
> ~Sumit.
>
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