linux-kernel - Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of staging

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Message-ID: <CAF6AEGvs0qVr_=pSp5FYoxM4XNaKLtYB-uhBmDheYcgxgv1_2g@mail.gmail.com>
Date:   Mon, 13 Mar 2017 17:29:31 -0400
From:   Rob Clark <robdclark@...il.com>
To:     Laura Abbott <labbott@...hat.com>
Cc:     Daniel Vetter <daniel.vetter@...ll.ch>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        devel@...verdev.osuosl.org, Rom Lemarchand <romlem@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Riley Andrews <riandrews@...roid.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Michal Hocko <mhocko@...nel.org>,
        "linaro-mm-sig@...ts.linaro.org" <linaro-mm-sig@...ts.linaro.org>,
        Linux MM <linux-mm@...ck.org>,
        Arve Hjønnevåg <arve@...roid.com>,
        Mark Brown <broonie@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>
Subject: Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of staging

On Mon, Mar 13, 2017 at 5:09 PM, Laura Abbott <labbott@...hat.com> wrote:
>> Hm, we might want to expose all the heaps as individual
>> /dev/ion_$heapname nodes? Should we do this from the start, since
>> we're massively revamping the uapi anyway (imo not needed, current
>> state seems to work too)?
>> -Daniel
>>
>
> I thought about that. One advantage with separate /dev/ion_$heap
> is that we don't have to worry about a limit of 32 possible
> heaps per system (32-bit heap id allocation field). But dealing
> with an ioctl seems easier than names. Userspace might be less
> likely to hardcode random id numbers vs. names as well.


other advantage, I think, is selinux (brought up elsewhere on this
thread).. heaps at known fixed PAs are useful for certain sorts of
attacks so being able to restrict access more easily seems like a good
thing

BR,
-R