linux-kernel - Re: [PATCH v16 7/8] media: v4l2: Add mem2mem helpers for DELETE

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Message-ID: <6b0e4c6b-493c-4916-ab3c-deeeb725fdec@xs4all.nl>
Date: Mon, 15 Jan 2024 17:50:09 +0100
From: Hans Verkuil <hverkuil@...all.nl>
To: Benjamin Gaignard <benjamin.gaignard@...labora.com>, mchehab@...nel.org
Cc: linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
 kernel@...labora.com
Subject: Re: [PATCH v16 7/8] media: v4l2: Add mem2mem helpers for DELETE_BUFS
 ioctl

On 15/12/2023 10:08, 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_drv.c   |  1 +
>  .../media/platform/verisilicon/hantro_v4l2.c  |  1 +
>  drivers/media/test-drivers/vim2m.c            |  2 ++

The driver changes should be done in a separate patch.

>  drivers/media/v4l2-core/v4l2-mem2mem.c        | 20 +++++++++++++++++++
>  include/media/v4l2-mem2mem.h                  | 12 +++++++++++
>  5 files changed, 36 insertions(+)
> 
> diff --git a/drivers/media/platform/verisilicon/hantro_drv.c b/drivers/media/platform/verisilicon/hantro_drv.c
> index db3df6cc4513..f6b0a676a740 100644
> --- a/drivers/media/platform/verisilicon/hantro_drv.c
> +++ b/drivers/media/platform/verisilicon/hantro_drv.c
> @@ -248,6 +248,7 @@ queue_init(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq)
>  	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
>  	dst_vq->lock = &ctx->dev->vpu_mutex;
>  	dst_vq->dev = ctx->dev->v4l2_dev.dev;
> +	src_vq->supports_delete_bufs = true;

Isn't this something that can be supported for both queues?

>  
>  	return vb2_queue_init(dst_vq);
>  }
> diff --git a/drivers/media/platform/verisilicon/hantro_v4l2.c b/drivers/media/platform/verisilicon/hantro_v4l2.c
> index 941fa23c211a..34eab90e8a42 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..17213ce42059 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_bufs	= v4l2_m2m_ioctl_delete_bufs,
>  	.vidioc_expbuf		= v4l2_m2m_ioctl_expbuf,
>  
>  	.vidioc_streamon	= v4l2_m2m_ioctl_streamon,
> @@ -1133,6 +1134,7 @@ 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 = &ctx->vb_mutex;
> +	dst_vq->supports_delete_bufs = true;

Same question.

>  
>  	return vb2_queue_init(dst_vq);
>  }
> diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
> index 9e983176542b..dbc4711fc556 100644
> --- a/drivers/media/v4l2-core/v4l2-mem2mem.c
> +++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
> @@ -834,6 +834,17 @@ 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);

These 3 lines can be combined into one.

> +
> +	return vb2_delete_bufs(vq, d);
> +}
> +EXPORT_SYMBOL_GPL(v4l2_m2m_delete_bufs);

I'm not sure we need to export this. Drivers should really just use the
v4l2_m2m_ioctl_ variant below.

> +
>  int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
>  			 struct v4l2_create_buffers *create)
>  {
> @@ -1380,6 +1391,15 @@ 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 7f1af1f7f912..5314952ad3d5 100644
> --- a/include/media/v4l2-mem2mem.h
> +++ b/include/media/v4l2-mem2mem.h
> @@ -388,6 +388,16 @@ 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
> @@ -867,6 +877,8 @@ 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