linux-kernel - Re: [PATCH v5 10/10] media: v4l2: Add mem2mem helpers for DELETE

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Date:   Wed, 30 Aug 2023 15:53:29 +0200
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        mchehab@...nel.org, tfiga@...omium.org, m.szyprowski@...sung.com,
        ming.qian@....com, ezequiel@...guardiasur.com.ar,
        p.zabel@...gutronix.de, gregkh@...uxfoundation.org,
        nicolas.dufresne@...labora.com
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-staging@...ts.linux.dev,
        kernel@...labora.com
Subject: Re: [PATCH v5 10/10] media: v4l2: Add mem2mem helpers for DELETE_BUFS
 ioctl

On 24/08/2023 11:21, Benjamin Gaignard wrote:
> Create v4l2-mem2mem helpers for VIDIOC_DELETE_BUFS ioctl.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
> ---
>  .../media/platform/verisilicon/hantro_v4l2.c  |  1 +
>  drivers/media/test-drivers/vim2m.c            |  1 +
>  drivers/media/v4l2-core/v4l2-mem2mem.c        | 20 +++++++++++++++++++
>  include/media/v4l2-mem2mem.h                  | 12 +++++++++++
>  4 files changed, 34 insertions(+)
> 
> diff --git a/drivers/media/platform/verisilicon/hantro_v4l2.c b/drivers/media/platform/verisilicon/hantro_v4l2.c
> index 27a1e77cca38..0fd1c2fc78c8 100644
> --- a/drivers/media/platform/verisilicon/hantro_v4l2.c
> +++ b/drivers/media/platform/verisilicon/hantro_v4l2.c
> @@ -756,6 +756,7 @@ const struct v4l2_ioctl_ops hantro_ioctl_ops = {
>  	.vidioc_dqbuf = v4l2_m2m_ioctl_dqbuf,
>  	.vidioc_prepare_buf = v4l2_m2m_ioctl_prepare_buf,
>  	.vidioc_create_bufs = v4l2_m2m_ioctl_create_bufs,
> +	.vidioc_delete_bufs = v4l2_m2m_ioctl_delete_bufs,
>  	.vidioc_expbuf = v4l2_m2m_ioctl_expbuf,
>  
>  	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
> diff --git a/drivers/media/test-drivers/vim2m.c b/drivers/media/test-drivers/vim2m.c
> index 3e3b424b4860..3014b8ee13d0 100644
> --- a/drivers/media/test-drivers/vim2m.c
> +++ b/drivers/media/test-drivers/vim2m.c
> @@ -960,6 +960,7 @@ static const struct v4l2_ioctl_ops vim2m_ioctl_ops = {
>  	.vidioc_dqbuf		= v4l2_m2m_ioctl_dqbuf,
>  	.vidioc_prepare_buf	= v4l2_m2m_ioctl_prepare_buf,
>  	.vidioc_create_bufs	= v4l2_m2m_ioctl_create_bufs,
> +	.vidioc_delete_buf	= v4l2_m2m_ioctl_delete_buf,

I suspect you didn't enable vim2m in your kernel config, since this
should be:

	.vidioc_delete_bufs = v4l2_m2m_ioctl_delete_bufs,

>  	.vidioc_expbuf		= v4l2_m2m_ioctl_expbuf,
>  
>  	.vidioc_streamon	= v4l2_m2m_ioctl_streamon,
> diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
> index 0cc30397fbad..d1d59943680f 100644
> --- a/drivers/media/v4l2-core/v4l2-mem2mem.c
> +++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
> @@ -831,6 +831,17 @@ int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
>  }
>  EXPORT_SYMBOL_GPL(v4l2_m2m_prepare_buf);
>  
> +int v4l2_m2m_delete_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
> +			 struct v4l2_delete_buffers *d)
> +{
> +	struct vb2_queue *vq;
> +
> +	vq = v4l2_m2m_get_vq(m2m_ctx, d->type);
> +
> +	return vb2_delete_bufs(vq, d);
> +}
> +EXPORT_SYMBOL_GPL(v4l2_m2m_delete_bufs);
> +
>  int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
>  			 struct v4l2_create_buffers *create)
>  {
> @@ -1377,6 +1388,15 @@ int v4l2_m2m_ioctl_create_bufs(struct file *file, void *priv,
>  }
>  EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_create_bufs);
>  
> +int v4l2_m2m_ioctl_delete_bufs(struct file *file, void *priv,
> +			       struct v4l2_delete_buffers *d)
> +{
> +	struct v4l2_fh *fh = file->private_data;
> +
> +	return v4l2_m2m_delete_bufs(file, fh->m2m_ctx, d);
> +}
> +EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_delete_bufs);
> +
>  int v4l2_m2m_ioctl_querybuf(struct file *file, void *priv,
>  				struct v4l2_buffer *buf)
>  {
> diff --git a/include/media/v4l2-mem2mem.h b/include/media/v4l2-mem2mem.h
> index d6c8eb2b5201..161f85c42dc8 100644
> --- a/include/media/v4l2-mem2mem.h
> +++ b/include/media/v4l2-mem2mem.h
> @@ -381,6 +381,16 @@ int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
>  int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
>  			 struct v4l2_buffer *buf);
>  
> +/**
> + * v4l2_m2m_delete_bufs() - delete buffers from the queue
> + *
> + * @file: pointer to struct &file
> + * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
> + * @d: pointer to struct &v4l2_delete_buffers
> + */
> +int v4l2_m2m_delete_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
> +			 struct v4l2_delete_buffers *d);
> +
>  /**
>   * v4l2_m2m_create_bufs() - create a source or destination buffer, depending
>   * on the type
> @@ -860,6 +870,8 @@ int v4l2_m2m_ioctl_reqbufs(struct file *file, void *priv,
>  				struct v4l2_requestbuffers *rb);
>  int v4l2_m2m_ioctl_create_bufs(struct file *file, void *fh,
>  				struct v4l2_create_buffers *create);
> +int v4l2_m2m_ioctl_delete_bufs(struct file *file, void *priv,
> +			       struct v4l2_delete_buffers *d);
>  int v4l2_m2m_ioctl_querybuf(struct file *file, void *fh,
>  				struct v4l2_buffer *buf);
>  int v4l2_m2m_ioctl_expbuf(struct file *file, void *fh,

Regards,

	Hans