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 the 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.
The patches were successfully tested to cooperate with EXYNOS DRM driver using DMABUF mechanism.
Please note, that the amount of changes to vb2-dma-contig.c was significant making the difference patch very difficult to read.
The patchset makes use of dma_get_pages extension for DMA API, which is posted on a top of dma-mapping patches by Marek Szyprowski [4] [5].
The tree, that contains all needed patches, can be found here [6].
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/42966... [2] https://lkml.org/lkml/2011/12/26/29 [3] http://thread.gmane.org/gmane.linux.drivers.video-input-infrastructure/36354... [4] http://thread.gmane.org/gmane.linux.kernel.cross-arch/12819 [5] http://git.infradead.org/users/kmpark/linux-2.6-samsung/shortlog/refs/heads/... [6] http://git.infradead.org/users/kmpark/linux-2.6-samsung/shortlog/refs/heads/...
Sumit Semwal (1): v4l: vb2: Add dma-contig allocator as dma_buf user
Tomasz Stanislawski (8): v4l: vb2: fixes for DMABUF support v4l: vb2-dma-contig: update and code refactoring v4l: add buffer exporting via dmabuf v4l: vb2: add buffer exporting via dmabuf v4l: vb2-dma-contig: add support for DMABUF exporting v4l: vb2-dma-contig: change map/unmap behaviour v4l: fimc: integrate capture i-face with dmabuf v4l: s5p-tv: mixer: integrate with dmabuf
drivers/media/video/Kconfig | 1 + drivers/media/video/s5p-fimc/fimc-capture.c | 11 +- drivers/media/video/s5p-tv/Kconfig | 1 + drivers/media/video/s5p-tv/mixer_video.c | 12 +- drivers/media/video/v4l2-compat-ioctl32.c | 1 + drivers/media/video/v4l2-ioctl.c | 11 + drivers/media/video/videobuf2-core.c | 88 +++- drivers/media/video/videobuf2-dma-contig.c | 717 ++++++++++++++++++++++++--- include/linux/videodev2.h | 20 + include/media/v4l2-ioctl.h | 2 + include/media/videobuf2-core.h | 8 +- 11 files changed, 779 insertions(+), 93 deletions(-)