[libcamera-devel] media: vimc: VIMC multiple streams

Kieran Bingham kieran.bingham at ideasonboard.com
Wed Jul 22 15:49:38 CEST 2020


Hi Kaaira,

On 22/07/2020 14:43, Kaaira Gupta wrote:
> This is a patchset by Niklas (https://patchwork.kernel.org/cover/10948831/)
> that I have rebased on the current media-tree, I have not added anything
> to it and it is just a compressed version of his patchset into a single
> patch, based on the latest master to aid testing multiple stream support
> in the VIMC pipeline.
> 
> Signed-off-by: Kaaira Gupta <kgupta at es.iitr.ac.in>

Great, it's good to hear that Niklas' patches still work and are simple
to rebase.

I think his patches would need to be kept separate though, and submitted
to the linux kernel through the linux-media mailing list, with any
comments from the previous series addressed.

You can keep Niklas' patches and his authorship, but add your signed-off
by tag, and document any changes you make in the commit message before
resubmitting to linux-media.


Then when we get to a point that the kernel can support multiple
streams, we can then enable that support in libcamera (we might have to
add a variable that enables multiple streams based on the kernel
version, but lets see how it goes).


--
Kieran



> ---
>  .../media/test-drivers/vimc/vimc-capture.c    | 35 ++++++++++++++++++-
>  .../media/test-drivers/vimc/vimc-debayer.c    |  8 +++++
>  drivers/media/test-drivers/vimc/vimc-scaler.c |  8 +++++
>  drivers/media/test-drivers/vimc/vimc-sensor.c |  8 +++++
>  .../media/test-drivers/vimc/vimc-streamer.c   | 22 +++++++-----
>  5 files changed, 71 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/media/test-drivers/vimc/vimc-capture.c b/drivers/media/test-drivers/vimc/vimc-capture.c
> index c63496b17b9a..5fc56582af83 100644
> --- a/drivers/media/test-drivers/vimc/vimc-capture.c
> +++ b/drivers/media/test-drivers/vimc/vimc-capture.c
> @@ -237,16 +237,49 @@ static void vimc_cap_return_all_buffers(struct vimc_cap_device *vcap,
>  	spin_unlock(&vcap->qlock);
>  }
>  
> +static struct media_entity *vimc_cap_get_sensor(struct vimc_cap_device *vcap)
> +{
> +	struct media_entity *entity = &vcap->vdev.entity;
> +	struct media_device *mdev = entity->graph_obj.mdev;
> +	struct media_graph graph;
> +
> +	mutex_lock(&mdev->graph_mutex);
> +	if (media_graph_walk_init(&graph, mdev)) {
> +		mutex_unlock(&mdev->graph_mutex);
> +		return NULL;
> +	}
> +
> +	media_graph_walk_start(&graph, entity);
> +
> +	while ((entity = media_graph_walk_next(&graph)))
> +		if (entity->function == MEDIA_ENT_F_CAM_SENSOR)
> +			break;
> +
> +	mutex_unlock(&mdev->graph_mutex);
> +
> +	media_graph_walk_cleanup(&graph);
> +
> +	return entity;
> +}
> +
>  static int vimc_cap_start_streaming(struct vb2_queue *vq, unsigned int count)
>  {
>  	struct vimc_cap_device *vcap = vb2_get_drv_priv(vq);
>  	struct media_entity *entity = &vcap->vdev.entity;
> +	struct media_pipeline *pipe = NULL;
> +	struct media_entity *sensorent;
>  	int ret;
>  
>  	vcap->sequence = 0;
>  
>  	/* Start the media pipeline */
> -	ret = media_pipeline_start(entity, &vcap->stream.pipe);
> +	sensorent = vimc_cap_get_sensor(vcap);
> +	if (sensorent && sensorent->pipe)
> +		pipe = sensorent->pipe;
> +	else
> +		pipe = &vcap->stream.pipe;
> +
> +	ret = media_pipeline_start(entity, pipe);
>  	if (ret) {
>  		vimc_cap_return_all_buffers(vcap, VB2_BUF_STATE_QUEUED);
>  		return ret;
> diff --git a/drivers/media/test-drivers/vimc/vimc-debayer.c b/drivers/media/test-drivers/vimc/vimc-debayer.c
> index c3f6fef34f68..93fe19d8d2b4 100644
> --- a/drivers/media/test-drivers/vimc/vimc-debayer.c
> +++ b/drivers/media/test-drivers/vimc/vimc-debayer.c
> @@ -29,6 +29,7 @@ struct vimc_deb_pix_map {
>  struct vimc_deb_device {
>  	struct vimc_ent_device ved;
>  	struct v4l2_subdev sd;
> +	atomic_t use_count;
>  	/* The active format */
>  	struct v4l2_mbus_framefmt sink_fmt;
>  	u32 src_code;
> @@ -343,6 +344,9 @@ static int vimc_deb_s_stream(struct v4l2_subdev *sd, int enable)
>  		const struct vimc_pix_map *vpix;
>  		unsigned int frame_size;
>  
> +		if (atomic_inc_return(&vdeb->use_count) != 1)
> +			return 0;
> +
>  		if (vdeb->src_frame)
>  			return 0;
>  
> @@ -368,6 +372,9 @@ static int vimc_deb_s_stream(struct v4l2_subdev *sd, int enable)
>  			return -ENOMEM;
>  
>  	} else {
> +		if (atomic_dec_return(&vdeb->use_count) != 0)
> +			return 0;
> +
>  		if (!vdeb->src_frame)
>  			return 0;
>  
> @@ -595,6 +602,7 @@ static struct vimc_ent_device *vimc_deb_add(struct vimc_device *vimc,
>  	vdeb->ved.process_frame = vimc_deb_process_frame;
>  	vdeb->ved.dev = vimc->mdev.dev;
>  	vdeb->mean_win_size = vimc_deb_ctrl_mean_win_size.def;
> +	atomic_set(&vdeb->use_count, 0);
>  
>  	/* Initialize the frame format */
>  	vdeb->sink_fmt = sink_fmt_default;
> diff --git a/drivers/media/test-drivers/vimc/vimc-scaler.c b/drivers/media/test-drivers/vimc/vimc-scaler.c
> index 121fa7d62a2e..9b8458dbe57c 100644
> --- a/drivers/media/test-drivers/vimc/vimc-scaler.c
> +++ b/drivers/media/test-drivers/vimc/vimc-scaler.c
> @@ -25,6 +25,7 @@ MODULE_PARM_DESC(sca_mult, " the image size multiplier");
>  struct vimc_sca_device {
>  	struct vimc_ent_device ved;
>  	struct v4l2_subdev sd;
> +	atomic_t use_count;
>  	/* NOTE: the source fmt is the same as the sink
>  	 * with the width and hight multiplied by mult
>  	 */
> @@ -340,6 +341,9 @@ static int vimc_sca_s_stream(struct v4l2_subdev *sd, int enable)
>  		const struct vimc_pix_map *vpix;
>  		unsigned int frame_size;
>  
> +		if (atomic_inc_return(&vsca->use_count) != 1)
> +			return 0;
> +
>  		if (vsca->src_frame)
>  			return 0;
>  
> @@ -363,6 +367,9 @@ static int vimc_sca_s_stream(struct v4l2_subdev *sd, int enable)
>  			return -ENOMEM;
>  
>  	} else {
> +		if (atomic_dec_return(&vsca->use_count) != 0)
> +			return 0;
> +
>  		if (!vsca->src_frame)
>  			return 0;
>  
> @@ -506,6 +513,7 @@ static struct vimc_ent_device *vimc_sca_add(struct vimc_device *vimc,
>  
>  	vsca->ved.process_frame = vimc_sca_process_frame;
>  	vsca->ved.dev = vimc->mdev.dev;
> +	atomic_set(&vsca->use_count, 0);
>  
>  	/* Initialize the frame format */
>  	vsca->sink_fmt = sink_fmt_default;
> diff --git a/drivers/media/test-drivers/vimc/vimc-sensor.c b/drivers/media/test-drivers/vimc/vimc-sensor.c
> index a2f09ac9a360..d68113886290 100644
> --- a/drivers/media/test-drivers/vimc/vimc-sensor.c
> +++ b/drivers/media/test-drivers/vimc/vimc-sensor.c
> @@ -18,6 +18,7 @@ struct vimc_sen_device {
>  	struct vimc_ent_device ved;
>  	struct v4l2_subdev sd;
>  	struct tpg_data tpg;
> +	atomic_t use_count;
>  	u8 *frame;
>  	/* The active format */
>  	struct v4l2_mbus_framefmt mbus_format;
> @@ -201,6 +202,9 @@ static int vimc_sen_s_stream(struct v4l2_subdev *sd, int enable)
>  		const struct vimc_pix_map *vpix;
>  		unsigned int frame_size;
>  
> +		if (atomic_inc_return(&vsen->use_count) != 1)
> +			return 0;
> +
>  		/* Calculate the frame size */
>  		vpix = vimc_pix_map_by_code(vsen->mbus_format.code);
>  		frame_size = vsen->mbus_format.width * vpix->bpp *
> @@ -219,6 +223,9 @@ static int vimc_sen_s_stream(struct v4l2_subdev *sd, int enable)
>  
>  	} else {
>  
> +		if (atomic_dec_return(&vsen->use_count) != 0)
> +			return 0;
> +
>  		vfree(vsen->frame);
>  		vsen->frame = NULL;
>  	}
> @@ -359,6 +366,7 @@ static struct vimc_ent_device *vimc_sen_add(struct vimc_device *vimc,
>  
>  	vsen->ved.process_frame = vimc_sen_process_frame;
>  	vsen->ved.dev = vimc->mdev.dev;
> +	atomic_set(&vsen->use_count, 0);
>  
>  	/* Initialize the frame format */
>  	vsen->mbus_format = fmt_default;
> diff --git a/drivers/media/test-drivers/vimc/vimc-streamer.c b/drivers/media/test-drivers/vimc/vimc-streamer.c
> index 451a32c0d034..d5b966a99f7b 100644
> --- a/drivers/media/test-drivers/vimc/vimc-streamer.c
> +++ b/drivers/media/test-drivers/vimc/vimc-streamer.c
> @@ -192,33 +192,35 @@ int vimc_streamer_s_stream(struct vimc_stream *stream,
>  			   struct vimc_ent_device *ved,
>  			   int enable)
>  {
> +	static DEFINE_MUTEX(vimc_streamer_lock);
>  	int ret;
>  
>  	if (!stream || !ved)
>  		return -EINVAL;
>  
> +	ret = mutex_lock_interruptible(&vimc_streamer_lock);
> +	if (ret)
> +		return ret;
> +
>  	if (enable) {
>  		if (stream->kthread)
> -			return 0;
> +			goto out;
>  
>  		ret = vimc_streamer_pipeline_init(stream, ved);
>  		if (ret)
> -			return ret;
> +			goto out;
>  
>  		stream->kthread = kthread_run(vimc_streamer_thread, stream,
>  					      "vimc-streamer thread");
>  
>  		if (IS_ERR(stream->kthread)) {
>  			ret = PTR_ERR(stream->kthread);
> -			dev_err(ved->dev, "kthread_run failed with %d\n", ret);
> -			vimc_streamer_pipeline_terminate(stream);
> -			stream->kthread = NULL;
> -			return ret;
> +			goto out;
>  		}
>  
>  	} else {
>  		if (!stream->kthread)
> -			return 0;
> +			goto out;
>  
>  		ret = kthread_stop(stream->kthread);
>  		/*
> @@ -228,12 +230,14 @@ int vimc_streamer_s_stream(struct vimc_stream *stream,
>  		 * pipeline.
>  		 */
>  		if (ret)
> -			dev_dbg(ved->dev, "kthread_stop returned '%d'\n", ret);
> +			goto out;
>  
>  		stream->kthread = NULL;
>  
>  		vimc_streamer_pipeline_terminate(stream);
>  	}
> +out:
> +	mutex_unlock(&vimc_streamer_lock);
>  
> -	return 0;
> +	return ret;
>  }
> 

-- 
Regards
--
Kieran


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