linux-kernel - Re: [PATCHv3 7/8] videobuf2: handle V4L2_MEMORY_FLAG_NON

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Date:   Mon, 26 Jul 2021 10:40:14 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Dafna Hirschfeld <dafna.hirschfeld@...labora.com>
Cc:     Sergey Senozhatsky <senozhatsky@...omium.org>,
        Tomasz Figa <tfiga@...omium.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Ricardo Ribalda <ribalda@...omium.org>,
        Christoph Hellwig <hch@....de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Collabora Kernel ML <kernel@...labora.com>
Subject: Re: [PATCHv3 7/8] videobuf2: handle V4L2_MEMORY_FLAG_NON_COHERENT
 flag

On (21/07/22 19:33), Dafna Hirschfeld wrote:
[..]
> >   int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)
> >   {
> >   	int ret = vb2_verify_memory_type(q, req->memory, req->type);
> > +	u32 flags = req->flags;
> >   	fill_buf_caps(q, &req->capabilities);
> > -	return ret ? ret : vb2_core_reqbufs(q, req->memory, 0, &req->count);
> > +	validate_memory_flags(q, req->memory, &flags);
> > +	req->flags = flags;
> 
> you can do instead
> 
> validate_memory_flags(q, req->memory, &req->flags);

->flags are u32 for create-bufs and u8 for reqi-bufs. So `*flags = <value>`
can write to ->reserved[] for req-bufs (if the value is huge enough).