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

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Date:   Thu, 9 Mar 2017 11:00:39 +0100
From:   Benjamin Gaignard <benjamin.gaignard@...aro.org>
To:     Mark Brown <broonie@...nel.org>, Michal Hocko <mhocko@...nel.org>,
        Laura Abbott <labbott@...hat.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Riley Andrews <riandrews@...roid.com>,
        Arve Hjønnevåg <arve@...roid.com>,
        Rom Lemarchand <romlem@...gle.com>, devel@...verdev.osuosl.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linaro-mm-sig@...ts.linaro.org" <linaro-mm-sig@...ts.linaro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-kernel@...ts.infradead.org,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Brian Starkey <brian.starkey@....com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        linux-mm@...ck.org
Subject: Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of staging

2017-03-06 17:04 GMT+01:00 Daniel Vetter <daniel@...ll.ch>:
> On Mon, Mar 06, 2017 at 11:58:05AM +0100, Mark Brown wrote:
>> On Mon, Mar 06, 2017 at 11:40:41AM +0100, Daniel Vetter wrote:
>>
>> > No one gave a thing about android in upstream, so Greg KH just dumped it
>> > all into staging/android/. We've discussed ION a bunch of times, recorded
>> > anything we'd like to fix in staging/android/TODO, and Laura's patch
>> > series here addresses a big chunk of that.
>>
>> > This is pretty much the same approach we (gpu folks) used to de-stage the
>> > syncpt stuff.
>>
>> Well, there's also the fact that quite a few people have issues with the
>> design (like Laurent).  It seems like a lot of them have either got more
>> comfortable with it over time, or at least not managed to come up with
>> any better ideas in the meantime.
>
> See the TODO, it has everything a really big group (look at the patch for
> the full Cc: list) figured needs to be improved at LPC 2015. We don't just
> merge stuff because merging stuff is fun :-)
>
> Laurent was even in that group ...
> -Daniel

For me those patches are going in the right direction.

I still have few questions:
- since alignment management has been remove from ion-core, should it
be also removed from ioctl structure ?
- can you we ride off ion_handle (at least in userland) and only
export a dma-buf descriptor ?

In the future how can we add new heaps ?
Some platforms have very specific memory allocation
requirements (just have a look in the number of gem custom allocator in drm)
Do you plan to add heap type/mask for each ?

Benjamin

> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch


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