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

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Message-ID: <CAAFQd5CH=NoDUJArp=6_28WSgkQ3jTMR3SOyx1iYro-7e4c2hA@mail.gmail.com>
Date:   Thu, 9 Nov 2023 18:48:15 +0900
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 Thu, Nov 9, 2023 at 6:46 PM Benjamin Gaignard
<benjamin.gaignard@...labora.com> wrote:
>
>
> Le 09/11/2023 à 10:43, Tomasz Figa a écrit :
> > 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?
>
> That exactly the case for Hantro driver, it can support deleting buffers on
> capture queue but not on output queue.

Fair enough.

Best regards,
Tomasz