linux-kernel - Re: [PATCH v14 56/56] media: test-drivers: Use helper for DELETE

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Date:   Thu, 9 Nov 2023 09:43:11 +0000
From:   Tomasz Figa <tfiga@...omium.org>
To:     Benjamin Gaignard <benjamin.gaignard@...labora.com>
Cc:     mchehab@...nel.org, m.szyprowski@...sung.com, ming.qian@....com,
        ezequiel@...guardiasur.com.ar, p.zabel@...gutronix.de,
        gregkh@...uxfoundation.org, hverkuil-cisco@...all.nl,
        nicolas.dufresne@...labora.com, 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 v14 56/56] media: test-drivers: Use helper for
 DELETE_BUFS ioctl

On Tue, Oct 31, 2023 at 05:31:04PM +0100, Benjamin Gaignard wrote:
> Allow test drivers to use DELETE_BUFS by adding vb2_ioctl_delete_bufs() helper.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
> ---
>  drivers/media/test-drivers/vicodec/vicodec-core.c |  2 ++
>  drivers/media/test-drivers/vimc/vimc-capture.c    |  2 ++
>  drivers/media/test-drivers/visl/visl-video.c      |  2 ++
>  drivers/media/test-drivers/vivid/vivid-core.c     | 13 ++++++++++---
>  4 files changed, 16 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/test-drivers/vicodec/vicodec-core.c b/drivers/media/test-drivers/vicodec/vicodec-core.c
> index 69cbe2c094e1..f14a8fd506d0 100644
> --- a/drivers/media/test-drivers/vicodec/vicodec-core.c
> +++ b/drivers/media/test-drivers/vicodec/vicodec-core.c
> @@ -1339,6 +1339,7 @@ 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_delete_bufs	= v4l2_m2m_ioctl_delete_bufs,
>  
>  	.vidioc_streamon	= v4l2_m2m_ioctl_streamon,
>  	.vidioc_streamoff	= v4l2_m2m_ioctl_streamoff,
> @@ -1725,6 +1726,7 @@ static int queue_init(void *priv, struct vb2_queue *src_vq,
>  	dst_vq->mem_ops = &vb2_vmalloc_memops;
>  	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
>  	dst_vq->lock = src_vq->lock;
> +	dst_vq->supports_delete_bufs = true;

Since we have to explicitly provide the vidioc_delete_bufs callback anyway,
is there any value in having a separate supports_delete_bufs flag? Or we
envision that some drivers would support deleting buffers only for some
queues?

Best regards,
Tomasz