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

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Message-ID: <20200309090802.GA231920@google.com>
Date:   Mon, 9 Mar 2020 18:08:02 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Tomasz Figa <tfiga@...omium.org>
Cc:     Hans Verkuil <hverkuil@...all.nl>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Hans Verkuil <hans.verkuil@...co.com>,
        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 Mailing List <linux-media@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: [PATCHv4 01/11] videobuf2: add cache management members

On (20/03/09 17:58), Tomasz Figa wrote:
[..]
> > > I see. Hmm, how do I do "test that V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS
> > > is never set" then?
> >
> > Not sure I understand your question. When requesting buffers for non-MMAP memory,
> > this capability must never be returned. That has nothing to do with a cache_hints
> > module option.
>
> Have we decided that we explicitly don't want to support this for
> USERPTR memory, even though technically possible and without much
> extra code needed?

My irrelevant 5 cents (sorry), I'd probably prefer to land MMAP
first + test drivers patches + v4l-util patches. The effort
required to land this is getting bigger.

	-ss