linux-kernel - Re: [PATCHv4 05/11] videobuf2: handle V4L2_FLAG_MEMORY_NON

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Message-ID: <20200307093800.GA191261@google.com>
Date:   Sat, 7 Mar 2020 18:38:00 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Hans Verkuil <hverkuil@...all.nl>
Cc:     Hans Verkuil <hans.verkuil@...co.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Sakari Ailus <sakari.ailus@....fi>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Pawel Osciak <posciak@...omium.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: Re: [PATCHv4 05/11] videobuf2: handle
 V4L2_FLAG_MEMORY_NON_CONSISTENT flag

On (20/03/07 16:51), Sergey Senozhatsky wrote:
> On (20/03/06 16:30), Hans Verkuil wrote:
> [..]
> > >  
> > >  /* capabilities for struct v4l2_requestbuffers and v4l2_create_buffers */
> > > @@ -2446,7 +2449,8 @@ struct v4l2_create_buffers {
> > >  	__u32			memory;
> > >  	struct v4l2_format	format;
> > >  	__u32			capabilities;
> > > -	__u32			reserved[7];
> > > +	__u32			flags;
> > 
> > The new flags argument needs to be documented in the command for struct v4l2_create_buffers.
> > 

Hans, what does "command for struct v4l2_create_buffers" mean?

BTW, I added v4l2_create_buffers::flags comment:

---

diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 12b1bd220347..c6c1cccbb5c1 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -2441,6 +2441,8 @@ struct v4l2_dbg_chip_info {
  * @memory:	enum v4l2_memory; buffer memory type
  * @format:	frame format, for which buffers are requested
  * @capabilities: capabilities of this buffer type.
+ * @flags:	additional buffer management attributes (ignored if queue
+ *		does not have V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS capability).
  * @reserved:	future extensions
  */
 struct v4l2_create_buffers {