media: videobuf2: Add min_reqbufs_allocation field to vb2_queue structure

Add 'min_reqbufs_allocation' field in the vb2_queue structure so drivers
can specify the minimum number of buffers to allocate when calling
VIDIOC_REQBUFS.
When initializing the queue, v4l2 core makes sure that the following
constraints are respected:
- the minimum number of buffers to allocate must be at least 2 because
one buffer is used by the hardware while the other is being processed
by userspace.
-if the driver needs 'min_queued_buffers' in the queue before calling
start_streaming(), then the minimum requirement is 'min_queued_buffers + 1'
to keep at least one buffer available for userspace.

Simplify __vb2_init_fileio() by using 'min_reqbufs_allocation' directly
to avoid duplicating the minimum number of buffers to allocate computation.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

1 files changed, 23 insertions, 15 deletions

diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
index d8b3c04cb3b5..58c495b253ce 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -866,7 +866,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
 	/*
 	 * Make sure the requested values and current defaults are sane.
 	 */
-	num_buffers = max_t(unsigned int, *count, q->min_queued_buffers);
+	num_buffers = max_t(unsigned int, *count, q->min_reqbufs_allocation);
 	num_buffers = min_t(unsigned int, num_buffers, q->max_num_buffers);
 	memset(q->alloc_devs, 0, sizeof(q->alloc_devs));
 	/*
@@ -918,7 +918,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
 	 * There is no point in continuing if we can't allocate the minimum
 	 * number of buffers needed by this vb2_queue.
 	 */
-	if (allocated_buffers < q->min_queued_buffers)
+	if (allocated_buffers < q->min_reqbufs_allocation)
 		ret = -ENOMEM;
 
 	/*
@@ -2524,6 +2524,25 @@ int vb2_core_queue_init(struct vb2_queue *q)
 	if (WARN_ON(q->supports_requests && q->min_queued_buffers))
 		return -EINVAL;
 
+	/*
+	 * The minimum requirement is 2: one buffer is used
+	 * by the hardware while the other is being processed by userspace.
+	 */
+	if (q->min_reqbufs_allocation < 2)
+		q->min_reqbufs_allocation = 2;
+
+	/*
+	 * If the driver needs 'min_queued_buffers' in the queue before
+	 * calling start_streaming() then the minimum requirement is
+	 * 'min_queued_buffers + 1' to keep at least one buffer available
+	 * for userspace.
+	 */
+	if (q->min_reqbufs_allocation < q->min_queued_buffers + 1)
+		q->min_reqbufs_allocation = q->min_queued_buffers + 1;
+
+	if (WARN_ON(q->min_reqbufs_allocation > q->max_num_buffers))
+		return -EINVAL;
+
 	INIT_LIST_HEAD(&q->queued_list);
 	INIT_LIST_HEAD(&q->done_list);
 	spin_lock_init(&q->done_lock);
@@ -2717,7 +2736,6 @@ static int __vb2_init_fileio(struct vb2_queue *q, int read)
 	struct vb2_fileio_data *fileio;
 	struct vb2_buffer *vb;
 	int i, ret;
-	unsigned int count = 0;
 
 	/*
 	 * Sanity check
@@ -2738,18 +2756,8 @@ static int __vb2_init_fileio(struct vb2_queue *q, int read)
 	if (q->streaming || vb2_get_num_buffers(q) > 0)
 		return -EBUSY;
 
-	/*
-	 * Start with q->min_queued_buffers + 1, driver can increase it in
-	 * queue_setup()
-	 *
-	 * 'min_queued_buffers' buffers need to be queued up before you
-	 * can start streaming, plus 1 for userspace (or in this case,
-	 * kernelspace) processing.
-	 */
-	count = max(2, q->min_queued_buffers + 1);
-
 	dprintk(q, 3, "setting up file io: mode %s, count %d, read_once %d, write_immediately %d\n",
-		(read) ? "read" : "write", count, q->fileio_read_once,
+		(read) ? "read" : "write", q->min_reqbufs_allocation, q->fileio_read_once,
 		q->fileio_write_immediately);
 
 	fileio = kzalloc(sizeof(*fileio), GFP_KERNEL);
@@ -2763,7 +2771,7 @@ static int __vb2_init_fileio(struct vb2_queue *q, int read)
 	 * Request buffers and use MMAP type to force driver
 	 * to allocate buffers by itself.
 	 */
-	fileio->count = count;
+	fileio->count = q->min_reqbufs_allocation;
 	fileio->memory = VB2_MEMORY_MMAP;
 	fileio->type = q->type;
 	q->fileio = fileio;