Adds DMABUF memory type to v4l framework. Also adds the related file descriptor in v4l2_plane and v4l2_buffer. [original work in the PoC for buffer sharing]
Showing the changes to include/uapi/linux (1 of 3 files). Show all
Unified · Split
| @@ -186,6 +186,7 @@ enum v4l2_memory { · 185 unmodified lines | ||
| 186 | 186 | V4L2_MEMORY_MMAP = 1, |
| 187 | 187 | V4L2_MEMORY_USERPTR = 2, |
| 188 | 188 | V4L2_MEMORY_OVERLAY = 3, |
| 189 | + V4L2_MEMORY_DMABUF = 4, | |
| 189 | 190 | }; |
| 190 | 191 | |
| 191 | 192 | /* see also http://vektor.theorem.ca/graphics/ycbcr/ */ |
| @@ -602,6 +603,8 @@ struct v4l2_requestbuffers { · 410 unmodified lines | ||
| 602 | 603 | * should be passed to mmap() called on the video node) |
| 603 | 604 | * @userptr: when memory is V4L2_MEMORY_USERPTR, a userspace pointer |
| 604 | 605 | * pointing to this plane |
| 606 | + * @fd: when memory is V4L2_MEMORY_DMABUF, a userspace file | |
| 607 | + * descriptor associated with this plane | |
| 605 | 608 | * @data_offset: offset in the plane to the start of data; usually 0, |
| 606 | 609 | * unless there is a header in front of the data |
| 607 | 610 | * |
| @@ -616,6 +619,7 @@ struct v4l2_plane { · 8 unmodified lines | ||
| 616 | 619 | union { |
| 617 | 620 | __u32 mem_offset; |
| 618 | 621 | unsigned long userptr; |
| 622 | + __s32 fd; | |
| 619 | 623 | } m; |
| 620 | 624 | __u32 data_offset; |
| 621 | 625 | __u32 reserved[11]; |
| @@ -640,6 +644,8 @@ struct v4l2_plane { · 18 unmodified lines | ||
| 640 | 644 | * (or a "cookie" that should be passed to mmap() as offset) |
| 641 | 645 | * @userptr: for non-multiplanar buffers with memory == V4L2_MEMORY_USERPTR; |
| 642 | 646 | * a userspace pointer pointing to this buffer |
| 647 | + * @fd: for non-multiplanar buffers with memory == V4L2_MEMORY_DMABUF; | |
| 648 | + * a userspace file descriptor associated with this buffer | |
| 643 | 649 | * @planes: for multiplanar buffers; userspace pointer to the array of plane |
| 644 | 650 | * info structs for this buffer |
| 645 | 651 | * @length: size in bytes of the buffer (NOT its payload) for single-plane |
| @@ -666,6 +672,7 @@ struct v4l2_buffer { · 20 unmodified lines | ||
| 666 | 672 | __u32 offset; |
| 667 | 673 | unsigned long userptr; |
| 668 | 674 | struct v4l2_plane *planes; |
| 675 | + __s32 fd; | |
| 669 | 676 | } m; |
| 670 | 677 | __u32 length; |
| 671 | 678 | __u32 reserved2; |