Hi Tomasz/Sumit,
Em 23-01-2012 11:51, Tomasz Stanislawski escreveu:
Hello everyone, This patchset is an incremental patch to patchset created by Sumit Semwal [1]. The patches are dedicated to help find a better solution for support of buffer sharing by V4L2 API. It is expected to start discussion on final installment for dma-buf in vb2-dma-contig allocator. Current version of the patches contain little documentation. It is going to be fixed after achieving consensus about design for buffer exporting. Moreover the API between vb2-core and the allocator should be revised.
I just raised a few points for the discussions for a few patches. Please don't understand them as a full review. It isn't.
Btw, it would be nice to have vivi support for the dmabuf sharing, in order to allow the patches to be tested by a wider audience, especially due to the new userspace API proposal.
Regards, Mauro
The amount of changes to vb2-dma-contig.c was significant making the difference patch very difficult to read. Therefore the patch was split into two parts. One removes old file, the next patch creates the version of the file.
The patchset contains extension for DMA API and its implementation for ARM architecture. Therefore the patchset should be applied on the top of:
http://git.infradead.org/users/kmpark/linux-2.6-samsung/shortlog/refs/heads/...
After applying patches from [2] and [1].
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/42966... [2] https://lkml.org/lkml/2011/12/26/29 [3] http://thread.gmane.org/gmane.linux.drivers.video-input-infrastructure/36354...
Marek Szyprowski (2): [media] media: vb2: remove plane argument from call_memop and cleanup mempriv usage media: vb2: add prepare/finish callbacks to allocators
Tomasz Stanislawski (8): arm: dma: support for dma_get_pages v4l: vb2: fixes for DMABUF support v4l: add buffer exporting via dmabuf v4l: vb2: add buffer exporting via dmabuf v4l: vb2: remove dma-contig allocator v4l: vb2-dma-contig: code refactoring, support for DMABUF exporting v4l: fimc: integrate capture i-face with dmabuf v4l: s5p-tv: mixer: integrate with dmabuf
arch/arm/include/asm/dma-mapping.h | 8 + arch/arm/mm/dma-mapping.c | 44 ++ drivers/media/video/s5p-fimc/fimc-capture.c | 11 +- drivers/media/video/s5p-tv/mixer_video.c | 11 +- drivers/media/video/v4l2-compat-ioctl32.c | 1 + drivers/media/video/v4l2-ioctl.c | 11 + drivers/media/video/videobuf2-core.c | 114 ++++- drivers/media/video/videobuf2-dma-contig.c | 754 +++++++++++++++++++++------ include/linux/dma-mapping.h | 2 + include/linux/videodev2.h | 1 + include/media/v4l2-ioctl.h | 1 + include/media/videobuf2-core.h | 10 +- 12 files changed, 789 insertions(+), 179 deletions(-)