From: Marek Szyprowski m.szyprowski@samsung.com
This patch adds support for prepare/finish callbacks in VB2 allocators. These callback are used for buffer flushing.
Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com --- drivers/media/video/videobuf2-core.c | 11 +++++++++++ include/media/videobuf2-core.h | 7 +++++++ 2 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/drivers/media/video/videobuf2-core.c b/drivers/media/video/videobuf2-core.c index b37feea..abb0592 100644 --- a/drivers/media/video/videobuf2-core.c +++ b/drivers/media/video/videobuf2-core.c @@ -834,6 +834,7 @@ void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state) { struct vb2_queue *q = vb->vb2_queue; unsigned long flags; + int plane;
if (vb->state != VB2_BUF_STATE_ACTIVE) return; @@ -844,6 +845,10 @@ void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state) dprintk(4, "Done processing on buffer %d, state: %d\n", vb->v4l2_buf.index, vb->state);
+ /* sync buffers */ + for (plane = 0; plane < vb->num_planes; ++plane) + call_memop(q, finish, vb->planes[plane].mem_priv); + /* Add the buffer to the done buffers list */ spin_lock_irqsave(&q->done_lock, flags); vb->state = state; @@ -1131,9 +1136,15 @@ err: static void __enqueue_in_driver(struct vb2_buffer *vb) { struct vb2_queue *q = vb->vb2_queue; + int plane;
vb->state = VB2_BUF_STATE_ACTIVE; atomic_inc(&q->queued_count); + + /* sync buffers */ + for (plane = 0; plane < vb->num_planes; ++plane) + call_memop(q, prepare, vb->planes[plane].mem_priv); + q->ops->buf_queue(vb); }
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h index 665e846..244165a 100644 --- a/include/media/videobuf2-core.h +++ b/include/media/videobuf2-core.h @@ -56,6 +56,10 @@ struct vb2_fileio_data; * dmabuf * @unmap_dmabuf: releases access control to the dmabuf - allocator is notified * that this driver is done using the dmabuf for now + * @prepare: called everytime the buffer is passed from userspace to the + * driver, usefull for cache synchronisation, optional + * @finish: called everytime the buffer is passed back from the driver + * to the userspace, also optional * @vaddr: return a kernel virtual address to a given memory buffer * associated with the passed private structure or NULL if no * such mapping exists @@ -82,6 +86,9 @@ struct vb2_mem_ops { unsigned long size, int write); void (*put_userptr)(void *buf_priv);
+ void (*prepare)(void *buf_priv); + void (*finish)(void *buf_priv); + /* * Comment from Rob Clark: XXX: I think the attach / detach could be * handled in the vb2 core, and vb2_mem_ops really just need to get/put