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Subject[PATCH v10 06/16] vb2: add is_unordered callback for drivers
Date
From: Gustavo Padovan <gustavo.padovan@collabora.com>

Explicit synchronization benefits a lot from ordered queues, they fit
better in a pipeline with DRM for example so create a opt-in way for
drivers notify videobuf2 that the queue is unordered.

Drivers don't need implement it if the queue is ordered.

v5: rename it to vb2_ops_is_unordered() (Hans Verkuil)

v4: go back to a bitfield property for the unordered property.

v3: - make it bool (Hans)
- create vb2_ops_set_unordered() helper

v2: - improve comments for is_unordered flag (Hans Verkuil)

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
---
drivers/media/common/videobuf2/videobuf2-core.c | 6 ++++++
include/media/videobuf2-core.h | 16 ++++++++++++++++
2 files changed, 22 insertions(+)

diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
index 61e7b6407586..a9a0a9d1decb 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -691,6 +691,12 @@ void vb2_ops_wait_finish(struct vb2_queue *vq)
}
EXPORT_SYMBOL_GPL(vb2_ops_wait_finish);

+bool vb2_ops_is_unordered(struct vb2_queue *q)
+{
+ return true;
+}
+EXPORT_SYMBOL_GPL(vb2_ops_is_unordered);
+
int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
unsigned int *count)
{
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index 137f72702101..71538ae2c255 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -376,6 +376,10 @@ struct vb2_buffer {
* callback by calling vb2_buffer_done() with either
* %VB2_BUF_STATE_DONE or %VB2_BUF_STATE_ERROR; may use
* vb2_wait_for_all_buffers() function
+ * @is_unordered: tell if the queue is unordered, i.e. buffers can be
+ * dequeued in a different order from how they were queued.
+ * The default is assumed to be ordered and this function
+ * only needs to be implemented for unordered queues.
* @buf_queue: passes buffer vb to the driver; driver may start
* hardware operation on this buffer; driver should give
* the buffer back by calling vb2_buffer_done() function;
@@ -399,6 +403,7 @@ struct vb2_ops {

int (*start_streaming)(struct vb2_queue *q, unsigned int count);
void (*stop_streaming)(struct vb2_queue *q);
+ bool (*is_unordered)(struct vb2_queue *q);

void (*buf_queue)(struct vb2_buffer *vb);
};
@@ -421,6 +426,16 @@ void vb2_ops_wait_prepare(struct vb2_queue *vq);
*/
void vb2_ops_wait_finish(struct vb2_queue *vq);

+/**
+ * vb2_ops_is_unordered - helper function to check if queue is unordered
+ *
+ * @vq: pointer to &struct vb2_queue
+ *
+ * This helper just returns true to notify that the driver can't deal with
+ * ordered queues.
+ */
+bool vb2_ops_is_unordered(struct vb2_queue *q);
+
/**
* struct vb2_buf_ops - driver-specific callbacks.
*
@@ -590,6 +605,7 @@ struct vb2_queue {
u32 cnt_wait_finish;
u32 cnt_start_streaming;
u32 cnt_stop_streaming;
+ u32 cnt_is_unordered;
#endif
};

--
2.16.3
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