diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0243-media-videobuf2-Allow-exporting-of-a-struct-dmabuf.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.19/950-0243-media-videobuf2-Allow-exporting-of-a-struct-dmabuf.patch | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0243-media-videobuf2-Allow-exporting-of-a-struct-dmabuf.patch b/target/linux/brcm2708/patches-4.19/950-0243-media-videobuf2-Allow-exporting-of-a-struct-dmabuf.patch new file mode 100644 index 0000000000..fbaa3c2d40 --- /dev/null +++ b/target/linux/brcm2708/patches-4.19/950-0243-media-videobuf2-Allow-exporting-of-a-struct-dmabuf.patch @@ -0,0 +1,83 @@ +From 0b2a62596d0e6efe17bb87a3a5ebd91cee60c64b Mon Sep 17 00:00:00 2001 +From: Dave Stevenson <dave.stevenson@raspberrypi.org> +Date: Mon, 29 Oct 2018 17:57:45 +0000 +Subject: [PATCH] media: videobuf2: Allow exporting of a struct dmabuf + +videobuf2 only allowed exporting a dmabuf as a file descriptor, +but there are instances where having the struct dma_buf is +useful within the kernel. + +Split the current implementation into two, one step which +exports a struct dma_buf, and the second which converts that +into an fd. + +Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org> +--- + .../media/common/videobuf2/videobuf2-core.c | 21 ++++++++++++++++--- + include/media/videobuf2-core.h | 15 +++++++++++++ + 2 files changed, 33 insertions(+), 3 deletions(-) + +--- a/drivers/media/common/videobuf2/videobuf2-core.c ++++ b/drivers/media/common/videobuf2/videobuf2-core.c +@@ -1851,12 +1851,12 @@ static int __find_plane_by_offset(struct + return -EINVAL; + } + +-int vb2_core_expbuf(struct vb2_queue *q, int *fd, unsigned int type, +- unsigned int index, unsigned int plane, unsigned int flags) ++int vb2_core_expbuf_dmabuf(struct vb2_queue *q, unsigned int type, ++ unsigned int index, unsigned int plane, ++ unsigned int flags, struct dma_buf **dmabuf) + { + struct vb2_buffer *vb = NULL; + struct vb2_plane *vb_plane; +- int ret; + struct dma_buf *dbuf; + + if (q->memory != VB2_MEMORY_MMAP) { +@@ -1906,6 +1906,21 @@ int vb2_core_expbuf(struct vb2_queue *q, + return -EINVAL; + } + ++ *dmabuf = dbuf; ++ return 0; ++} ++EXPORT_SYMBOL_GPL(vb2_core_expbuf_dmabuf); ++ ++int vb2_core_expbuf(struct vb2_queue *q, int *fd, unsigned int type, ++ unsigned int index, unsigned int plane, unsigned int flags) ++{ ++ struct dma_buf *dbuf; ++ int ret; ++ ++ ret = vb2_core_expbuf_dmabuf(q, type, index, plane, flags, &dbuf); ++ if (ret) ++ return ret; ++ + ret = dma_buf_fd(dbuf, flags & ~O_ACCMODE); + if (ret < 0) { + dprintk(3, "buffer %d, plane %d failed to export (%d)\n", +--- a/include/media/videobuf2-core.h ++++ b/include/media/videobuf2-core.h +@@ -825,6 +825,21 @@ int vb2_core_streamon(struct vb2_queue * + int vb2_core_streamoff(struct vb2_queue *q, unsigned int type); + + /** ++ * vb2_core_expbuf_dmabuf() - Export a buffer as a dma_buf structure ++ * @q: videobuf2 queue ++ * @type: buffer type ++ * @index: id number of the buffer ++ * @plane: index of the plane to be exported, 0 for single plane queues ++ * @flags: flags for newly created file, currently only O_CLOEXEC is ++ * supported, refer to manual of open syscall for more details ++ * @dmabuf: Returns the dmabuf pointer ++ * ++ */ ++int vb2_core_expbuf_dmabuf(struct vb2_queue *q, unsigned int type, ++ unsigned int index, unsigned int plane, ++ unsigned int flags, struct dma_buf **dmabuf); ++ ++/** + * vb2_core_expbuf() - Export a buffer as a file descriptor. + * @q: pointer to &struct vb2_queue with videobuf2 queue. + * @fd: pointer to the file descriptor associated with DMABUF |