From: Gustavo Padovan <gustavo.pado...@collabora.com>
Receive in-fence from userspace and add support for waiting on them
before queueing the buffer to the driver. Buffers are only queued
to the driver once they are ready. A buffer is ready when its
in-fence signals.
v2:
- fix vb2_queue_or_prepare_buf() ret check
- remove check for VB2_MEMORY_DMABUF only (Javier)
- check num of ready buffers to start streaming
- when queueing, start from the first ready buffer
- handle queue cancel
Signed-off-by: Gustavo Padovan <gustavo.pado...@collabora.com>
---
drivers/media/Kconfig | 1 +
drivers/media/v4l2-core/videobuf2-core.c | 97 +++++++++++++++++++++++++-------
drivers/media/v4l2-core/videobuf2-v4l2.c | 15 ++++-
include/media/videobuf2-core.h | 7 ++-
4 files changed, 99 insertions(+), 21 deletions(-)
diff --git a/drivers/media/Kconfig b/drivers/media/Kconfig
index 55d9c2b..3cd1d3d 100644
--- a/drivers/media/Kconfig
+++ b/drivers/media/Kconfig
@@ -11,6 +11,7 @@ config CEC_NOTIFIER
menuconfig MEDIA_SUPPORT
tristate "Multimedia support"
depends on HAS_IOMEM
+ select SYNC_FILE
help
If you want to use Webcams, Video grabber devices and/or TV devices
enable this option and other options below.
diff --git a/drivers/media/v4l2-core/videobuf2-core.c
b/drivers/media/v4l2-core/videobuf2-core.c
index ea83126..29aa9d4 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -1279,6 +1279,22 @@ static int __buf_prepare(struct vb2_buffer *vb, const
void *pb)
return 0;
}
+static int __get_num_ready_buffers(struct vb2_queue *q)
+{
+ struct vb2_buffer *vb;
+ int ready_count = 0;
+
+ /* count num of buffers ready in front of the queued_list */
+ list_for_each_entry(vb, &q->queued_list, queued_entry) {
+ if (vb->in_fence && !dma_fence_is_signaled(vb->in_fence))
+ break;
+
+ ready_count++;
+ }
+
+ return ready_count;
+}
+
int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb)
{
struct vb2_buffer *vb;
@@ -1324,8 +1340,15 @@ static int vb2_start_streaming(struct vb2_queue *q)
* If any buffers were queued before streamon,
* we can now pass them to driver for processing.
*/
- list_for_each_entry(vb, &q->queued_list, queued_entry)
+ list_for_each_entry(vb, &q->queued_list, queued_entry) {
+ if (vb->state != VB2_BUF_STATE_QUEUED)
+ continue;
+
+ if (vb->in_fence && !dma_fence_is_signaled(vb->in_fence))
+ break;
+
__enqueue_in_driver(vb);
+ }
/* Tell the driver to start streaming */
q->start_streaming_called = 1;
@@ -1369,33 +1392,55 @@ static int vb2_start_streaming(struct vb2_queue *q)
static int __vb2_core_qbuf(struct vb2_buffer *vb, struct vb2_queue *q)
{
+ struct vb2_buffer *b;
int ret;
/*
* If already streaming, give the buffer to driver for processing.
* If not, the buffer will be given to driver on next streamon.
*/
- if (q->start_streaming_called)
- __enqueue_in_driver(vb);
- /*
- * If streamon has been called, and we haven't yet called
- * start_streaming() since not enough buffers were queued, and
- * we now have reached the minimum number of queued buffers,
- * then we can finally call start_streaming().
- */
- if (q->streaming && !q->start_streaming_called &&
- q->queued_count >= q->min_buffers_needed) {
- ret = vb2_start_streaming(q);
- if (ret)
- return ret;
+ if (q->start_streaming_called) {
+ list_for_each_entry(b, &q->queued_list, queued_entry) {
+ if (b->state != VB2_BUF_STATE_QUEUED)
+ continue;
+
+ if (b->in_fence && !dma_fence_is_signaled(b->in_fence))
+ break;
+
+ __enqueue_in_driver(b);
+ }
+ } else {
+ /*
+ * If streamon has been called, and we haven't yet called
+ * start_streaming() since not enough buffers were queued, and
+ * we now have reached the minimum number of queued buffers
+ * that are ready, then we can finally call start_streaming().
+ */
+ if (q->streaming &&
+ __get_num_ready_buffers(q) >= q->min_buffers_needed) {
+ ret = vb2_start_streaming(q);
+ if (ret)
+ return ret;
+ }
}
dprintk(1, "qbuf of buffer %d succeeded\n", vb->index);
return 0;
}
-int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb)
+static void vb2_qbuf_fence_cb(struct dma_fence *f, struct dma_fence_cb *cb)
+{
+ struct vb2_buffer *vb = container_of(cb, struct vb2_buffer, fence_cb);
+
+ dma_fence_put(vb->in_fence);
+ vb->in_fence = NULL;
+
+ __vb2_core_qbuf(vb, vb->vb2_queue);
+}
+
+int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb,
+ struct dma_fence *fence)
{
struct vb2_buffer *vb;
int ret;
@@ -1436,6 +1481,11 @@ int vb2_core_qbuf(struct vb2_queue *q, unsigned int
index, void *pb)
if (pb)
call_void_bufop(q, fill_user_buffer, vb, pb);
+ vb->in_fence = fence;
+ if (fence && !dma_fence_add_callback(fence, &vb->fence_cb,
+ vb2_qbuf_fence_cb))
+ return 0;
+
return __vb2_core_qbuf(vb, q);
}
EXPORT_SYMBOL_GPL(vb2_core_qbuf);
@@ -1647,6 +1697,7 @@ EXPORT_SYMBOL_GPL(vb2_core_dqbuf);
static void __vb2_queue_cancel(struct vb2_queue *q)
{
unsigned int i;
+ struct vb2_buffer *vb;
/*
* Tell driver to stop all transactions and release all queued
@@ -1669,6 +1720,14 @@ static void __vb2_queue_cancel(struct vb2_queue *q)
WARN_ON(atomic_read(&q->owned_by_drv_count));
}
+ list_for_each_entry(vb, &q->queued_list, queued_entry) {
+ if (vb->in_fence) {
+ dma_fence_remove_callback(vb->in_fence, &vb->fence_cb);
+ dma_fence_put(vb->in_fence);
+ vb->in_fence = NULL;
+ }
+ }
+
q->streaming = 0;
q->start_streaming_called = 0;
q->queued_count = 0;
@@ -1735,7 +1794,7 @@ int vb2_core_streamon(struct vb2_queue *q, unsigned int
type)
* Tell driver to start streaming provided sufficient buffers
* are available.
*/
- if (q->queued_count >= q->min_buffers_needed) {
+ if (__get_num_ready_buffers(q) >= q->min_buffers_needed) {
ret = v4l_vb2q_enable_media_source(q);
if (ret)
return ret;
@@ -2250,7 +2309,7 @@ static int __vb2_init_fileio(struct vb2_queue *q, int
read)
* Queue all buffers.
*/
for (i = 0; i < q->num_buffers; i++) {
- ret = vb2_core_qbuf(q, i, NULL);
+ ret = vb2_core_qbuf(q, i, NULL, NULL);
if (ret)
goto err_reqbufs;
fileio->bufs[i].queued = 1;
@@ -2429,7 +2488,7 @@ static size_t __vb2_perform_fileio(struct vb2_queue *q,
char __user *data, size_
if (copy_timestamp)
b->timestamp = ktime_get_ns();
- ret = vb2_core_qbuf(q, index, NULL);
+ ret = vb2_core_qbuf(q, index, NULL, NULL);
dprintk(5, "vb2_dbuf result: %d\n", ret);
if (ret)
return ret;
@@ -2532,7 +2591,7 @@ static int vb2_thread(void *data)
if (copy_timestamp)
vb->timestamp = ktime_get_ns();;
if (!threadio->stop)
- ret = vb2_core_qbuf(q, vb->index, NULL);
+ ret = vb2_core_qbuf(q, vb->index, NULL, NULL);
call_void_qop(q, wait_prepare, q);
if (ret || threadio->stop)
break;
diff --git a/drivers/media/v4l2-core/videobuf2-v4l2.c
b/drivers/media/v4l2-core/videobuf2-v4l2.c
index 110fb45..e6ad77f 100644
--- a/drivers/media/v4l2-core/videobuf2-v4l2.c
+++ b/drivers/media/v4l2-core/videobuf2-v4l2.c
@@ -23,6 +23,7 @@
#include <linux/sched.h>
#include <linux/freezer.h>
#include <linux/kthread.h>
+#include <linux/sync_file.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-fh.h>
@@ -560,6 +561,7 @@ EXPORT_SYMBOL_GPL(vb2_create_bufs);
int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b)
{
+ struct dma_fence *fence = NULL;
int ret;
if (vb2_fileio_is_active(q)) {
@@ -568,7 +570,18 @@ int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b)
}
ret = vb2_queue_or_prepare_buf(q, b, "qbuf");
- return ret ? ret : vb2_core_qbuf(q, b->index, b);
+ if (ret)
+ return ret;
+
+ if (b->flags & V4L2_BUF_FLAG_IN_FENCE) {
+ fence = sync_file_get_fence(b->fence_fd);
+ if (!fence) {
+ dprintk(1, "failed to get in-fence from fd\n");
+ return -EINVAL;
+ }
+ }
+
+ return ret ? ret : vb2_core_qbuf(q, b->index, b, fence);
}
EXPORT_SYMBOL_GPL(vb2_qbuf);
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index cb97c22..aa43e43 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -16,6 +16,7 @@
#include <linux/mutex.h>
#include <linux/poll.h>
#include <linux/dma-buf.h>
+#include <linux/dma-fence.h>
#define VB2_MAX_FRAME (32)
#define VB2_MAX_PLANES (8)
@@ -259,6 +260,9 @@ struct vb2_buffer {
struct list_head queued_entry;
struct list_head done_entry;
+
+ struct dma_fence *in_fence;
+ struct dma_fence_cb fence_cb;
#ifdef CONFIG_VIDEO_ADV_DEBUG
/*
* Counters for how often these buffer-related ops are
@@ -727,7 +731,8 @@ int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int
index, void *pb);
* The return values from this function are intended to be directly returned
* from vidioc_qbuf handler in driver.
*/
-int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb);
+int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb,
+ struct dma_fence *fence);
/**
* vb2_core_dqbuf() - Dequeue a buffer to the userspace
--
2.9.4
