Date:   Tue, 29 Mar 2022 16:21:04 -0400
From:   Nicolas Dufresne <nicolas.dufresne@...labora.com>
To:     Chen-Yu Tsai <wenst@...omium.org>,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>
Cc:     linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>
Subject: Re: [PATCH v3] media: hantro: Implement support for encoder commands

Le mardi 01 mars 2022 à 12:22 +0800, Chen-Yu Tsai a écrit :
> The V4L2 stateful encoder uAPI specification requires that drivers
> support the ENCODER_CMD ioctl to allow draining of buffers. This
> however was not implemented, and causes issues for some userspace
> applications.
> 
> Implement support for the ENCODER_CMD ioctl using v4l2-mem2mem helpers.
> This is entirely based on existing code found in the vicodec test
> driver.
> 
> Fixes: 775fec69008d ("media: add Rockchip VPU JPEG encoder driver")
> Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
> Reviewed-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>

Tested-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>

What I tested:

1. That drain flow now works, with

gst-launch-1.0 videotestsrc num-buffers=3 ! v4l2jpegenc ! fakesink silent=0 -v

2. The Hantro decoders are not affect, running fluster with gst for VP8 and
H.264. Note this is on top of my field decoding series, hence the high H.264
score. Score is unchanged.

H.264: 129/135
VP8:   59/61

> ---
> 
> Changes since v2:
> - Dropped RFC tag
> - Added Reviewed-by from Benjamin
> - Replace direct access to vb->planes[i].bytesused with
>   vb2_set_plane_payload()
> 
> Changes since v1:
> - Correctly handle last buffers that are empty
> - Correctly handle last buffers that just got queued
> - Disable (TRY_)ENCODER_CMD ioctls for hantro decoder
> 
> This is based on linux-next-20220208, and was tested on RK3399 with
> Gstreamer running the JPEG encoder. It was also tested on ChromeOS
> 5.10 on Kevin with the video encoder used in ChromeOS ARC, which
> requires this. For ChromeOS, both encoder and decoder tests were run
> to check for regressions.
> 
> Everything really works OK now, but since I'm not very familiar with
> the mem2mem framework, I might be missing something, causing resource
> leaks. Hence this patch is labeled RFC.
> 
> Last, I suppose we could also add support for (TRY_)DECODER_CMD now?
> 
>  drivers/staging/media/hantro/hantro_drv.c  | 17 +++++-
>  drivers/staging/media/hantro/hantro_v4l2.c | 68 +++++++++++++++++++++-
>  2 files changed, 81 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/staging/media/hantro/hantro_drv.c b/drivers/staging/media/hantro/hantro_drv.c
> index bc9bcb4eaf46..99bc650a5a93 100644
> --- a/drivers/staging/media/hantro/hantro_drv.c
> +++ b/drivers/staging/media/hantro/hantro_drv.c
> @@ -56,6 +56,10 @@ dma_addr_t hantro_get_ref(struct hantro_ctx *ctx, u64 ts)
>  	return hantro_get_dec_buf_addr(ctx, buf);
>  }
>  
> +static const struct v4l2_event hantro_eos_event = {
> +	.type = V4L2_EVENT_EOS
> +};
> +
>  static void hantro_job_finish_no_pm(struct hantro_dev *vpu,
>  				    struct hantro_ctx *ctx,
>  				    enum vb2_buffer_state result)
> @@ -73,6 +77,12 @@ static void hantro_job_finish_no_pm(struct hantro_dev *vpu,
>  	src->sequence = ctx->sequence_out++;
>  	dst->sequence = ctx->sequence_cap++;
>  
> +	if (v4l2_m2m_is_last_draining_src_buf(ctx->fh.m2m_ctx, src)) {
> +		dst->flags |= V4L2_BUF_FLAG_LAST;
> +		v4l2_event_queue_fh(&ctx->fh, &hantro_eos_event);
> +		v4l2_m2m_mark_stopped(ctx->fh.m2m_ctx);
> +	}
> +
>  	v4l2_m2m_buf_done_and_job_finish(ctx->dev->m2m_dev, ctx->fh.m2m_ctx,
>  					 result);
>  }
> @@ -807,10 +817,13 @@ static int hantro_add_func(struct hantro_dev *vpu, unsigned int funcid)
>  	snprintf(vfd->name, sizeof(vfd->name), "%s-%s", match->compatible,
>  		 funcid == MEDIA_ENT_F_PROC_VIDEO_ENCODER ? "enc" : "dec");
>  
> -	if (funcid == MEDIA_ENT_F_PROC_VIDEO_ENCODER)
> +	if (funcid == MEDIA_ENT_F_PROC_VIDEO_ENCODER) {
>  		vpu->encoder = func;
> -	else
> +	} else {
>  		vpu->decoder = func;
> +		v4l2_disable_ioctl(vfd, VIDIOC_TRY_ENCODER_CMD);
> +		v4l2_disable_ioctl(vfd, VIDIOC_ENCODER_CMD);
> +	}
>  
>  	video_set_drvdata(vfd, vpu);
>  
> diff --git a/drivers/staging/media/hantro/hantro_v4l2.c b/drivers/staging/media/hantro/hantro_v4l2.c
> index 67148ba346f5..aa10ecd04c9c 100644
> --- a/drivers/staging/media/hantro/hantro_v4l2.c
> +++ b/drivers/staging/media/hantro/hantro_v4l2.c
> @@ -628,6 +628,39 @@ static int vidioc_s_selection(struct file *file, void *priv,
>  	return 0;
>  }
>  
> +static const struct v4l2_event hantro_eos_event = {
> +	.type = V4L2_EVENT_EOS
> +};
> +
> +static int vidioc_encoder_cmd(struct file *file, void *priv,
> +			      struct v4l2_encoder_cmd *ec)
> +{
> +	struct hantro_ctx *ctx = fh_to_ctx(priv);
> +	int ret;
> +
> +	ret = v4l2_m2m_ioctl_try_encoder_cmd(file, priv, ec);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (!vb2_is_streaming(v4l2_m2m_get_src_vq(ctx->fh.m2m_ctx)) ||
> +	    !vb2_is_streaming(v4l2_m2m_get_dst_vq(ctx->fh.m2m_ctx)))
> +		return 0;
> +
> +	ret = v4l2_m2m_ioctl_encoder_cmd(file, priv, ec);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (ec->cmd == V4L2_ENC_CMD_STOP &&
> +	    v4l2_m2m_has_stopped(ctx->fh.m2m_ctx))
> +		v4l2_event_queue_fh(&ctx->fh, &hantro_eos_event);
> +
> +	if (ec->cmd == V4L2_ENC_CMD_START &&
> +	    v4l2_m2m_has_stopped(ctx->fh.m2m_ctx))
> +		vb2_clear_last_buffer_dequeued(&ctx->fh.m2m_ctx->cap_q_ctx.q);
> +
> +	return 0;
> +}
> +
>  const struct v4l2_ioctl_ops hantro_ioctl_ops = {
>  	.vidioc_querycap = vidioc_querycap,
>  	.vidioc_enum_framesizes = vidioc_enum_framesizes,
> @@ -657,6 +690,9 @@ const struct v4l2_ioctl_ops hantro_ioctl_ops = {
>  
>  	.vidioc_g_selection = vidioc_g_selection,
>  	.vidioc_s_selection = vidioc_s_selection,
> +
> +	.vidioc_try_encoder_cmd = v4l2_m2m_ioctl_try_encoder_cmd,
> +	.vidioc_encoder_cmd = vidioc_encoder_cmd,
>  };
>  
>  static int
> @@ -733,8 +769,12 @@ static int hantro_buf_prepare(struct vb2_buffer *vb)
>  	 * (for OUTPUT buffers, if userspace passes 0 bytesused, v4l2-core sets
>  	 * it to buffer length).
>  	 */
> -	if (V4L2_TYPE_IS_CAPTURE(vq->type))
> -		vb2_set_plane_payload(vb, 0, pix_fmt->plane_fmt[0].sizeimage);
> +	if (V4L2_TYPE_IS_CAPTURE(vq->type)) {
> +		if (ctx->is_encoder)
> +			vb2_set_plane_payload(vb, 0, 0);
> +		else
> +			vb2_set_plane_payload(vb, 0, pix_fmt->plane_fmt[0].sizeimage);
> +	}
>  
>  	return 0;
>  }
> @@ -744,6 +784,22 @@ static void hantro_buf_queue(struct vb2_buffer *vb)
>  	struct hantro_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
>  	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
>  
> +	if (V4L2_TYPE_IS_CAPTURE(vb->vb2_queue->type) &&
> +	    vb2_is_streaming(vb->vb2_queue) &&
> +	    v4l2_m2m_dst_buf_is_last(ctx->fh.m2m_ctx)) {
> +		unsigned int i;
> +
> +		for (i = 0; i < vb->num_planes; i++)
> +			vb2_set_plane_payload(vb, i, 0);
> +
> +		vbuf->field = V4L2_FIELD_NONE;
> +		vbuf->sequence = ctx->sequence_cap++;
> +
> +		v4l2_m2m_last_buffer_done(ctx->fh.m2m_ctx, vbuf);
> +		v4l2_event_queue_fh(&ctx->fh, &hantro_eos_event);
> +		return;
> +	}
> +
>  	v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf);
>  }
>  
> @@ -759,6 +815,8 @@ static int hantro_start_streaming(struct vb2_queue *q, unsigned int count)
>  	struct hantro_ctx *ctx = vb2_get_drv_priv(q);
>  	int ret = 0;
>  
> +	v4l2_m2m_update_start_streaming_state(ctx->fh.m2m_ctx, q);
> +
>  	if (V4L2_TYPE_IS_OUTPUT(q->type))
>  		ctx->sequence_out = 0;
>  	else
> @@ -831,6 +889,12 @@ static void hantro_stop_streaming(struct vb2_queue *q)
>  		hantro_return_bufs(q, v4l2_m2m_src_buf_remove);
>  	else
>  		hantro_return_bufs(q, v4l2_m2m_dst_buf_remove);
> +
> +	v4l2_m2m_update_stop_streaming_state(ctx->fh.m2m_ctx, q);
> +
> +	if (V4L2_TYPE_IS_OUTPUT(q->type) &&
> +	    v4l2_m2m_has_stopped(ctx->fh.m2m_ctx))
> +		v4l2_event_queue_fh(&ctx->fh, &hantro_eos_event);
>  }
>  
>  static void hantro_buf_request_complete(struct vb2_buffer *vb)

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