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media: vb2: add (un)prepare_streaming queue ops
When userspace called VIDIOC_STREAMON, then you want to claim any streaming resources needed and validate the video pipeline. Waiting for start_streaming to be called is too late, since that can be postponed until the required minimum of buffers is queued. So add a prepare_streaming op (optional) that can be used for that purpose, and a matching unprepare_streaming op (optional) that can release any claimed resources. The unprepare_streaming op is called when VIDIOC_STREAMOFF is called and q->streaming is 1, or when the filehandle is closed while q->streaming is 1. Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
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parent
e9305a003f
commit
a10b215325
2 changed files with 35 additions and 4 deletions
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@ -544,6 +544,7 @@ static int __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
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*/
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if (q->num_buffers) {
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bool unbalanced = q->cnt_start_streaming != q->cnt_stop_streaming ||
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q->cnt_prepare_streaming != q->cnt_unprepare_streaming ||
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q->cnt_wait_prepare != q->cnt_wait_finish;
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if (unbalanced || debug) {
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@ -552,14 +553,18 @@ static int __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
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pr_info(" setup: %u start_streaming: %u stop_streaming: %u\n",
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q->cnt_queue_setup, q->cnt_start_streaming,
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q->cnt_stop_streaming);
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pr_info(" prepare_streaming: %u unprepare_streaming: %u\n",
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q->cnt_prepare_streaming, q->cnt_unprepare_streaming);
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pr_info(" wait_prepare: %u wait_finish: %u\n",
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q->cnt_wait_prepare, q->cnt_wait_finish);
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}
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q->cnt_queue_setup = 0;
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q->cnt_wait_prepare = 0;
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q->cnt_wait_finish = 0;
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q->cnt_prepare_streaming = 0;
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q->cnt_start_streaming = 0;
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q->cnt_stop_streaming = 0;
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q->cnt_unprepare_streaming = 0;
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}
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for (buffer = 0; buffer < q->num_buffers; ++buffer) {
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struct vb2_buffer *vb = q->bufs[buffer];
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@ -1991,6 +1996,9 @@ static void __vb2_queue_cancel(struct vb2_queue *q)
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if (q->start_streaming_called)
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call_void_qop(q, stop_streaming, q);
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if (q->streaming)
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call_void_qop(q, unprepare_streaming, q);
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/*
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* If you see this warning, then the driver isn't cleaning up properly
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* in stop_streaming(). See the stop_streaming() documentation in
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@ -2102,6 +2110,12 @@ int vb2_core_streamon(struct vb2_queue *q, unsigned int type)
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return -EINVAL;
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}
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ret = call_qop(q, prepare_streaming, q);
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if (ret)
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return ret;
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q->streaming = 1;
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/*
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* Tell driver to start streaming provided sufficient buffers
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* are available.
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@ -2109,16 +2123,19 @@ int vb2_core_streamon(struct vb2_queue *q, unsigned int type)
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if (q->queued_count >= q->min_buffers_needed) {
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ret = v4l_vb2q_enable_media_source(q);
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if (ret)
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return ret;
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goto unprepare;
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ret = vb2_start_streaming(q);
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if (ret)
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return ret;
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goto unprepare;
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}
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q->streaming = 1;
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dprintk(q, 3, "successful\n");
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return 0;
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unprepare:
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call_void_qop(q, unprepare_streaming, q);
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q->streaming = 0;
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return ret;
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}
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EXPORT_SYMBOL_GPL(vb2_core_streamon);
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@ -386,6 +386,12 @@ struct vb2_buffer {
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* the buffer contents will be ignored anyway.
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* @buf_cleanup: called once before the buffer is freed; drivers may
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* perform any additional cleanup; optional.
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* @prepare_streaming: called once to prepare for 'streaming' state; this is
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* where validation can be done to verify everything is
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* okay and streaming resources can be claimed. It is
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* called when the VIDIOC_STREAMON ioctl is called. The
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* actual streaming starts when @start_streaming is called.
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* Optional.
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* @start_streaming: called once to enter 'streaming' state; the driver may
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* receive buffers with @buf_queue callback
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* before @start_streaming is called; the driver gets the
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@ -405,6 +411,10 @@ struct vb2_buffer {
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* callback by calling vb2_buffer_done() with either
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* %VB2_BUF_STATE_DONE or %VB2_BUF_STATE_ERROR; may use
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* vb2_wait_for_all_buffers() function
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* @unprepare_streaming:called as counterpart to @prepare_streaming; any claimed
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* streaming resources can be released here. It is
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* called when the VIDIOC_STREAMOFF ioctls is called or
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* when the streaming filehandle is closed. Optional.
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* @buf_queue: passes buffer vb to the driver; driver may start
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* hardware operation on this buffer; driver should give
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* the buffer back by calling vb2_buffer_done() function;
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@ -432,8 +442,10 @@ struct vb2_ops {
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void (*buf_finish)(struct vb2_buffer *vb);
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void (*buf_cleanup)(struct vb2_buffer *vb);
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int (*prepare_streaming)(struct vb2_queue *q);
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int (*start_streaming)(struct vb2_queue *q, unsigned int count);
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void (*stop_streaming)(struct vb2_queue *q);
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void (*unprepare_streaming)(struct vb2_queue *q);
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void (*buf_queue)(struct vb2_buffer *vb);
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@ -641,8 +653,10 @@ struct vb2_queue {
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u32 cnt_queue_setup;
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u32 cnt_wait_prepare;
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u32 cnt_wait_finish;
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u32 cnt_prepare_streaming;
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u32 cnt_start_streaming;
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u32 cnt_stop_streaming;
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u32 cnt_unprepare_streaming;
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#endif
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};
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