[RFC PATCH 00/12] Ion cleanup in preparation for moving out of staging

Benjamin Gaignard benjamin.gaignard at linaro.org
Thu Mar 9 02:00:39 PST 2017

2017-03-06 17:04 GMT+01:00 Daniel Vetter <daniel at ffwll.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 ?


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

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