Date:   Fri,  4 May 2018 17:06:09 -0300
From:   Ezequiel Garcia <ezequiel@...labora.com>
To:     linux-media@...r.kernel.org
Cc:     kernel@...labora.com, Hans Verkuil <hverkuil@...all.nl>,
        Mauro Carvalho Chehab <mchehab@....samsung.com>,
        Shuah Khan <shuahkh@....samsung.com>,
        Pawel Osciak <pawel@...iak.com>,
        Alexandre Courbot <acourbot@...omium.org>,
        Sakari Ailus <sakari.ailus@....fi>,
        Brian Starkey <brian.starkey@....com>,
        linux-kernel@...r.kernel.org,
        Gustavo Padovan <gustavo.padovan@...labora.com>,
        Ezequiel Garcia <ezequiel@...labora.com>
Subject: [PATCH v9 12/15] vb2: add out-fence support to QBUF

From: Gustavo Padovan <gustavo.padovan@...labora.com>

If V4L2_BUF_FLAG_OUT_FENCE flag is present on the QBUF call we create
an out_fence and send its fd to userspace in the fence_fd field as a
return arg for the QBUF call.

The fence is signaled on buffer_done(), when the job on the buffer is
finished.

v11: - Return fence_fd to userpace only in the QBUF ioctl.
     - Rework implementation to avoid storing the sync_file
       as state, which is not really needed.

v10: - use -EIO for fence error (Hans Verkuil)
     - add comment around fence context creation (Hans Verkuil)

v9: - remove in-fences changes from this patch (Alex Courbot)
    - improve fence context creation (Hans Verkuil)
    - clean up out fences if vb2_core_qbuf() fails (Hans Verkuil)

v8: - return 0 as fence_fd if OUT_FENCE flag not used (Mauro)
    - fix crash when checking not using fences in vb2_buffer_done()

v7: - merge patch that add the infrastructure to out-fences into
      this one (Alex Courbot)
    - Do not install the fd if there is no fence. (Alex Courbot)
    - do not report error on requeueing, just WARN_ON_ONCE() (Hans)

v6: - get rid of the V4L2_EVENT_OUT_FENCE event. We always keep the
      ordering in vb2 for queueing in the driver, so the event is not
      necessary anymore and the out_fence_fd is sent back to userspace
      on QBUF call return arg
    - do not allow requeueing with out-fences, instead mark the buffer
      with an error and wake up to userspace.
    - send the out_fence_fd back to userspace on the fence_fd field

v5: - delay fd_install to DQ_EVENT (Hans)
    - if queue is fully ordered send OUT_FENCE event right away
      (Brian)
    - rename 'q->ordered' to 'q->ordered_in_driver'
    - merge change to implement OUT_FENCE event here

v4: - return the out_fence_fd in the BUF_QUEUED event(Hans)

v3: - add WARN_ON_ONCE(q->ordered) on requeueing (Hans)
    - set the OUT_FENCE flag if there is a fence pending (Hans)
    - call fd_install() after vb2_core_qbuf() (Hans)
    - clean up fence if vb2_core_qbuf() fails (Hans)
    - add list to store sync_file and fence for the next queued buffer

v2: check if the queue is ordered.

Signed-off-by: Gustavo Padovan <gustavo.padovan@...labora.com>
Signed-off-by: Ezequiel Garcia <ezequiel@...labora.com>
---
 drivers/media/common/videobuf2/videobuf2-core.c | 95 +++++++++++++++++++++++--
 drivers/media/common/videobuf2/videobuf2-v4l2.c | 22 +++++-
 drivers/media/dvb-core/dvb_vb2.c                |  2 +-
 include/media/videobuf2-core.h                  | 16 ++++-
 4 files changed, 127 insertions(+), 8 deletions(-)

diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
index 996b99497a98..0f7306a04db7 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -25,6 +25,7 @@
 #include <linux/sched.h>
 #include <linux/freezer.h>
 #include <linux/kthread.h>
+#include <linux/sync_file.h>
 
 #include <media/videobuf2-core.h>
 #include <media/v4l2-mc.h>
@@ -357,6 +358,7 @@ static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory,
 			vb->planes[plane].length = plane_sizes[plane];
 			vb->planes[plane].min_length = plane_sizes[plane];
 		}
+		vb->out_fence_fd = -1;
 		q->bufs[vb->index] = vb;
 
 		/* Allocate video buffer memory for the MMAP type */
@@ -948,10 +950,22 @@ static void vb2_process_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state
 	case VB2_BUF_STATE_QUEUED:
 		return;
 	case VB2_BUF_STATE_REQUEUEING:
+		/* Requeuing with explicit synchronization, spit warning */
+		WARN_ON_ONCE(vb->out_fence);
+
 		if (q->start_streaming_called)
 			__enqueue_in_driver(vb);
 		return;
 	default:
+		if (vb->out_fence) {
+			if (state == VB2_BUF_STATE_ERROR)
+				dma_fence_set_error(vb->out_fence, -EIO);
+			dma_fence_signal(vb->out_fence);
+			dma_fence_put(vb->out_fence);
+			vb->out_fence = NULL;
+			vb->out_fence_fd = -1;
+		}
+
 		/* Inform any processes that may be waiting for buffers */
 		wake_up(&q->done_wq);
 		break;
@@ -1367,6 +1381,68 @@ int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb)
 }
 EXPORT_SYMBOL_GPL(vb2_core_prepare_buf);
 
+static inline const char *vb2_fence_get_driver_name(struct dma_fence *fence)
+{
+	return "vb2_fence";
+}
+
+static inline const char *vb2_fence_get_timeline_name(struct dma_fence *fence)
+{
+	return "vb2_fence_timeline";
+}
+
+static inline bool vb2_fence_enable_signaling(struct dma_fence *fence)
+{
+	return true;
+}
+
+static const struct dma_fence_ops vb2_fence_ops = {
+	.get_driver_name = vb2_fence_get_driver_name,
+	.get_timeline_name = vb2_fence_get_timeline_name,
+	.enable_signaling = vb2_fence_enable_signaling,
+	.wait = dma_fence_default_wait,
+};
+
+static int vb2_setup_out_fence(struct vb2_queue *q, struct vb2_buffer *vb)
+{
+	struct sync_file *sync_file;
+	int ret;
+
+	vb->out_fence_fd = get_unused_fd_flags(O_CLOEXEC);
+
+	/*
+	 * The same context can be used only if the queue is ordered,
+	 * so if the queue is ordered create one when the queueing start,
+	 * otherwise create one for every buffer
+	 */
+	if (q->unordered || !q->queueing_started)
+		q->out_fence_context = dma_fence_context_alloc(1);
+
+	vb->out_fence = kzalloc(sizeof(*vb->out_fence), GFP_KERNEL);
+	if (!vb->out_fence) {
+		ret = -ENOMEM;
+		goto err_put_fd;
+	}
+	dma_fence_init(vb->out_fence, &vb2_fence_ops, &q->out_fence_lock,
+		       q->out_fence_context, 1);
+
+	sync_file = sync_file_create(vb->out_fence);
+	if (!sync_file) {
+		ret = -ENOMEM;
+		goto err_free_fence;
+	}
+	fd_install(vb->out_fence_fd, sync_file->file);
+	return 0;
+
+err_free_fence:
+	dma_fence_put(vb->out_fence);
+	vb->out_fence = NULL;
+err_put_fd:
+	put_unused_fd(vb->out_fence_fd);
+	vb->out_fence_fd = -1;
+	return ret;
+}
+
 /*
  * vb2_start_streaming() - Attempt to start streaming.
  * @q:		videobuf2 queue
@@ -1463,7 +1539,7 @@ static void vb2_qbuf_fence_cb(struct dma_fence *f, struct dma_fence_cb *cb)
 }
 
 int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb,
-		  struct dma_fence *in_fence)
+		  struct dma_fence *in_fence, bool out_fence)
 {
 	struct vb2_buffer *vb;
 	unsigned long flags;
@@ -1496,6 +1572,7 @@ int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb,
 	list_add_tail(&vb->queued_entry, &q->queued_list);
 	q->queued_count++;
 	q->waiting_for_buffers = false;
+	q->queueing_started = 1;
 	vb->state = VB2_BUF_STATE_QUEUED;
 	vb->in_fence = in_fence;
 
@@ -1555,6 +1632,14 @@ int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb,
 
 	spin_unlock_irqrestore(&vb->fence_cb_lock, flags);
 
+	if (out_fence) {
+		ret = vb2_setup_out_fence(q, vb);
+		if (ret) {
+			dprintk(1, "failed to set up out-fence\n");
+			goto err;
+		}
+	}
+
 	/* Fill buffer information for the userspace */
 	if (pb)
 		call_void_bufop(q, fill_user_buffer, vb, pb);
@@ -1818,6 +1903,7 @@ static void __vb2_queue_cancel(struct vb2_queue *q)
 	q->start_streaming_called = 0;
 	q->queued_count = 0;
 	q->error = 0;
+	q->queueing_started = 0;
 
 	list_for_each_entry(vb, &q->queued_list, queued_entry) {
 		spin_lock_irqsave(&vb->fence_cb_lock, flags);
@@ -2170,6 +2256,7 @@ int vb2_core_queue_init(struct vb2_queue *q)
 	spin_lock_init(&q->done_lock);
 	mutex_init(&q->mmap_lock);
 	init_waitqueue_head(&q->done_wq);
+	spin_lock_init(&q->out_fence_lock);
 
 	q->memory = VB2_MEMORY_UNKNOWN;
 
@@ -2421,7 +2508,7 @@ 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, NULL);
+			ret = vb2_core_qbuf(q, i, NULL, NULL, false);
 			if (ret)
 				goto err_reqbufs;
 			fileio->bufs[i].queued = 1;
@@ -2600,7 +2687,7 @@ 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, NULL);
+		ret = vb2_core_qbuf(q, index, NULL, NULL, false);
 		dprintk(5, "vb2_dbuf result: %d\n", ret);
 		if (ret)
 			return ret;
@@ -2703,7 +2790,7 @@ 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, NULL);
+			ret = vb2_core_qbuf(q, vb->index, NULL, NULL, false);
 		call_void_qop(q, wait_prepare, q);
 		if (ret || threadio->stop)
 			break;
diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
index 74d7062e5285..41a88839683e 100644
--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -217,7 +217,11 @@ static void __fill_v4l2_buffer(struct vb2_buffer *vb, void *pb)
 	b->sequence = vbuf->sequence;
 	b->reserved = 0;
 
-	b->fence_fd = 0;
+	if (b->flags & V4L2_BUF_FLAG_OUT_FENCE)
+		b->fence_fd = vb->out_fence_fd;
+	else
+		b->fence_fd = 0;
+
 	if (vb->in_fence)
 		b->flags |= V4L2_BUF_FLAG_IN_FENCE;
 	else
@@ -496,6 +500,13 @@ int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b)
 	ret = __verify_planes_array(vb, b);
 	if (!ret)
 		vb2_core_querybuf(q, b->index, b);
+
+	/*
+	 * Can't return a fence fd, because it only
+	 * makes sense on the process that queued the buffer.
+	 */
+	if (b->flags & (V4L2_BUF_FLAG_IN_FENCE | V4L2_BUF_FLAG_OUT_FENCE))
+		b->fence_fd = -1;
 	return ret;
 }
 EXPORT_SYMBOL(vb2_querybuf);
@@ -600,7 +611,8 @@ int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b)
 		}
 	}
 
-	return vb2_core_qbuf(q, b->index, b, in_fence);
+	return vb2_core_qbuf(q, b->index, b, in_fence,
+			     b->flags & V4L2_BUF_FLAG_OUT_FENCE);
 }
 EXPORT_SYMBOL_GPL(vb2_qbuf);
 
@@ -626,6 +638,12 @@ int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking)
 	 */
 	b->flags &= ~V4L2_BUF_FLAG_DONE;
 
+	/*
+	 * Can't return a fence fd, because it only
+	 * makes sense on the process that queued the buffer.
+	 */
+	if (b->flags & (V4L2_BUF_FLAG_IN_FENCE | V4L2_BUF_FLAG_OUT_FENCE))
+		b->fence_fd = -1;
 	return ret;
 }
 EXPORT_SYMBOL_GPL(vb2_dqbuf);
diff --git a/drivers/media/dvb-core/dvb_vb2.c b/drivers/media/dvb-core/dvb_vb2.c
index 7da53f10db1a..053803c9ff45 100644
--- a/drivers/media/dvb-core/dvb_vb2.c
+++ b/drivers/media/dvb-core/dvb_vb2.c
@@ -385,7 +385,7 @@ int dvb_vb2_qbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
 {
 	int ret;
 
-	ret = vb2_core_qbuf(&ctx->vb_q, b->index, b, NULL);
+	ret = vb2_core_qbuf(&ctx->vb_q, b->index, b, NULL, false);
 	if (ret) {
 		dprintk(1, "[%s] index=%d errno=%d\n", ctx->name,
 			b->index, ret);
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index 28ce8f66882e..794140fcb5cf 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -260,6 +260,9 @@ struct vb2_buffer {
 	 *			using the buffer (queueing to the driver)
 	 * fence_cb:		fence callback information
 	 * fence_cb_lock:	protect callback signal/remove
+	 * out_fence_fd:	the out_fence_fd to be shared with userspace.
+	 * out_fence:		the out-fence associated with the buffer once
+	 *			it is queued to the driver.
 	 */
 	enum vb2_buffer_state	state;
 
@@ -271,6 +274,9 @@ struct vb2_buffer {
 	struct dma_fence_cb	fence_cb;
 	spinlock_t              fence_cb_lock;
 
+	int			out_fence_fd;
+	struct dma_fence	*out_fence;
+
 #ifdef CONFIG_VIDEO_ADV_DEBUG
 	/*
 	 * Counters for how often these buffer-related ops are
@@ -533,6 +539,9 @@ struct vb2_buf_ops {
  * @last_buffer_dequeued: used in poll() and DQBUF to immediately return if the
  *		last decoded buffer was already dequeued. Set for capture queues
  *		when a buffer with the %V4L2_BUF_FLAG_LAST is dequeued.
+ * @queueing_started: if queueing has started. Currently used to determine
+ *		if an out_fence_context is needed.
+ * @out_fence_context: the fence context for the out fences
  * @fileio:	file io emulator internal data, used only if emulator is active
  * @threadio:	thread io internal data, used only if thread is active
  */
@@ -586,6 +595,10 @@ struct vb2_queue {
 	unsigned int			is_output:1;
 	unsigned int			copy_timestamp:1;
 	unsigned int			last_buffer_dequeued:1;
+	unsigned int			queueing_started:1;
+
+	u64				out_fence_context;
+	spinlock_t			out_fence_lock;
 
 	struct vb2_fileio_data		*fileio;
 	struct vb2_threadio_data	*threadio;
@@ -784,6 +797,7 @@ int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb);
  * @pb:		buffer structure passed from userspace to
  *		v4l2_ioctl_ops->vidioc_qbuf handler in driver
  * @in_fence:	in-fence to wait on before queueing the buffer
+ * @out_fence:	create an out-fence as a part of the queue operation
  *
  * Videobuf2 core helper to implement VIDIOC_QBUF() operation. It is called
  * internally by VB2 by an API-specific handler, like ``videobuf2-v4l2.h``.
@@ -799,7 +813,7 @@ int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb);
  * Return: returns zero on success; an error code otherwise.
  */
 int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb,
-		  struct dma_fence *in_fence);
+		  struct dma_fence *in_fence, bool out_fence);
 
 /**
  * vb2_core_dqbuf() - Dequeue a buffer to the userspace
-- 
2.16.3

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