linux-kernel - Re: [PATCHv4 01/11] videobuf2: add cache management members

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Message-ID: <20200309040305.GB9460@google.com>
Date:   Mon, 9 Mar 2020 13:03:05 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Hans Verkuil <hverkuil@...all.nl>
Cc:     Sergey Senozhatsky <senozhatsky@...omium.org>,
        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
Subject: Re: [PATCHv4 01/11] videobuf2: add cache management members

On (20/03/07 12:47), Hans Verkuil wrote:
> 
> 1) attempting to use V4L2_FLAG_MEMORY_NON_CONSISTENT will clear the flag
>    upon return (test with both reqbufs and create_bufs).
> 2) attempting to use V4L2_BUF_FLAG_NO_CACHE_INVALIDATE or V4L2_BUF_FLAG_NO_CACHE_CLEAN
>
[..]
>
> All these tests can be done in testReqBufs().

MEMORY_NON_CONSISTENT is a queue property, we set it during queue setup.
NO_CACHE_INVALIDATE/FLAG_NO_CACHE_CLEAN is a buffer property, we set it
when we qbuf. I'm not sure if all of these can be done in testReqBufts().

	-ss