From mboxrd@z Thu Jan 1 00:00:00 1970 From: labbott@redhat.com (Laura Abbott) Date: Thu, 9 Mar 2017 09:38:49 -0800 Subject: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of staging In-Reply-To: References: <1488491084-17252-1-git-send-email-labbott@redhat.com> <20170303132949.GC31582@dhcp22.suse.cz> <20170306074258.GA27953@dhcp22.suse.cz> <20170306104041.zghsicrnadoap7lp@phenom.ffwll.local> <20170306105805.jsq44kfxhsvazkm6@sirena.org.uk> <20170306160437.sf7bksorlnw7u372@phenom.ffwll.local> Message-ID: <26bc57ae-d88f-4ea0-d666-2c1a02bf866f@redhat.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 03/09/2017 02:00 AM, Benjamin Gaignard wrote: > 2017-03-06 17:04 GMT+01:00 Daniel Vetter : >> 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 ? Yes, I think I'm going to go with the suggestion to fixup the ABI so we don't need the compat layer and as part of that I'm also dropping the align argument. > - can you we ride off ion_handle (at least in userland) and only > export a dma-buf descriptor ? Yes, I think this is the right direction given we're breaking everything anyway. I was debating trying to keep the two but moving to only dma bufs is probably cleaner. The only reason I could see for keeping the handles is running out of file descriptors for dma-bufs but that seems unlikely. > > 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 ? Yes, that was my thinking. > > Benjamin > Thanks, Laura