Re: [PATCH v20 8/9] media: v4l2: Add mem2mem helpers for REMOVE_BUFS ioctl

[Hans Verkuil <hverkuil-cisco@xs4all.nl>]

On 21/02/2024 4:54 pm, Benjamin Gaignard wrote:
> Create v4l2-mem2mem helpers for VIDIOC_REMOVE_BUFS ioctl and
> make test drivers use it.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
> ---
>  drivers/media/test-drivers/vicodec/vicodec-core.c |  1 +
>  drivers/media/test-drivers/vim2m.c                |  1 +
>  drivers/media/test-drivers/vimc/vimc-capture.c    |  1 +
>  drivers/media/test-drivers/visl/visl-video.c      |  1 +
>  drivers/media/test-drivers/vivid/vivid-core.c     |  1 +
>  drivers/media/v4l2-core/v4l2-mem2mem.c            | 10 ++++++++++
>  include/media/v4l2-mem2mem.h                      |  2 ++
>  7 files changed, 17 insertions(+)
> 
> diff --git a/drivers/media/test-drivers/vicodec/vicodec-core.c b/drivers/media/test-drivers/vicodec/vicodec-core.c
> index e13f5452b927..3e011fe62ae1 100644
> --- a/drivers/media/test-drivers/vicodec/vicodec-core.c
> +++ b/drivers/media/test-drivers/vicodec/vicodec-core.c
> @@ -1345,6 +1345,7 @@ static const struct v4l2_ioctl_ops vicodec_ioctl_ops = {
>  	.vidioc_prepare_buf	= v4l2_m2m_ioctl_prepare_buf,
>  	.vidioc_create_bufs	= v4l2_m2m_ioctl_create_bufs,
>  	.vidioc_expbuf		= v4l2_m2m_ioctl_expbuf,
> +	.vidioc_remove_bufs	= v4l2_m2m_ioctl_remove_bufs,
>  
>  	.vidioc_streamon	= v4l2_m2m_ioctl_streamon,
>  	.vidioc_streamoff	= v4l2_m2m_ioctl_streamoff,
> diff --git a/drivers/media/test-drivers/vim2m.c b/drivers/media/test-drivers/vim2m.c
> index 3e3b424b4860..14aff4ad576b 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_remove_bufs	= v4l2_m2m_ioctl_remove_bufs,
>  	.vidioc_expbuf		= v4l2_m2m_ioctl_expbuf,
>  
>  	.vidioc_streamon	= v4l2_m2m_ioctl_streamon,

Perhaps leave this vim2m driver without remove_bufs support? The reason
you didn't catch the uninitialized capabilities bug is that now all test drivers
support this new ioctl. I think at least one should not support it to
catch such issues.

Regards,

	Hans

> diff --git a/drivers/media/test-drivers/vimc/vimc-capture.c b/drivers/media/test-drivers/vimc/vimc-capture.c
> index 97693561f1e4..ba7550b8ba7e 100644
> --- a/drivers/media/test-drivers/vimc/vimc-capture.c
> +++ b/drivers/media/test-drivers/vimc/vimc-capture.c
> @@ -221,6 +221,7 @@ static const struct v4l2_ioctl_ops vimc_capture_ioctl_ops = {
>  	.vidioc_expbuf = vb2_ioctl_expbuf,
>  	.vidioc_streamon = vb2_ioctl_streamon,
>  	.vidioc_streamoff = vb2_ioctl_streamoff,
> +	.vidioc_remove_bufs = vb2_ioctl_remove_bufs,
>  };
>  
>  static void vimc_capture_return_all_buffers(struct vimc_capture_device *vcapture,
> diff --git a/drivers/media/test-drivers/visl/visl-video.c b/drivers/media/test-drivers/visl/visl-video.c
> index b9a4b44bd0ed..f8d970319764 100644
> --- a/drivers/media/test-drivers/visl/visl-video.c
> +++ b/drivers/media/test-drivers/visl/visl-video.c
> @@ -539,6 +539,7 @@ const struct v4l2_ioctl_ops visl_ioctl_ops = {
>  	.vidioc_prepare_buf		= v4l2_m2m_ioctl_prepare_buf,
>  	.vidioc_create_bufs		= v4l2_m2m_ioctl_create_bufs,
>  	.vidioc_expbuf			= v4l2_m2m_ioctl_expbuf,
> +	.vidioc_remove_bufs		= v4l2_m2m_ioctl_remove_bufs,
>  
>  	.vidioc_streamon		= v4l2_m2m_ioctl_streamon,
>  	.vidioc_streamoff		= v4l2_m2m_ioctl_streamoff,
> diff --git a/drivers/media/test-drivers/vivid/vivid-core.c b/drivers/media/test-drivers/vivid/vivid-core.c
> index 11b8520d9f57..771392f67dda 100644
> --- a/drivers/media/test-drivers/vivid/vivid-core.c
> +++ b/drivers/media/test-drivers/vivid/vivid-core.c
> @@ -769,6 +769,7 @@ static const struct v4l2_ioctl_ops vivid_ioctl_ops = {
>  	.vidioc_expbuf			= vb2_ioctl_expbuf,
>  	.vidioc_streamon		= vb2_ioctl_streamon,
>  	.vidioc_streamoff		= vb2_ioctl_streamoff,
> +	.vidioc_remove_bufs		= vb2_ioctl_remove_bufs,
>  
>  	.vidioc_enum_input		= vivid_enum_input,
>  	.vidioc_g_input			= vivid_g_input,
> diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
> index 75517134a5e9..ba21c60f1ed3 100644
> --- a/drivers/media/v4l2-core/v4l2-mem2mem.c
> +++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
> @@ -1386,6 +1386,16 @@ int v4l2_m2m_ioctl_create_bufs(struct file *file, void *priv,
>  }
>  EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_create_bufs);
>  
> +int v4l2_m2m_ioctl_remove_bufs(struct file *file, void *priv,
> +			       struct v4l2_remove_buffers *remove)
> +{
> +	struct v4l2_fh *fh = file->private_data;
> +
> +	return vb2_core_remove_bufs(v4l2_m2m_get_vq(fh->m2m_ctx, remove->type),
> +				    remove->index, remove->count);
> +}
> +EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_remove_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 7f1af1f7f912..0af330cf91c3 100644
> --- a/include/media/v4l2-mem2mem.h
> +++ b/include/media/v4l2-mem2mem.h
> @@ -867,6 +867,8 @@ 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_remove_bufs(struct file *file, void *priv,
> +			       struct v4l2_remove_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,