Patrik Jakobsson <patrik.r.jakobsson at gmail.com> wrote 2016/09/02 21:54:41:
> Patrik Jakobsson <patrik.r.jakobsson at gmail.com> > 2016/09/02 21:54 > > Re: [PATCH] drm/gma500: remove the process of stolen page in page > fault handler. > > On Fri, Sep 2, 2016 at 11:31 AM, <jiang.biao2 at zte.com.cn> wrote: > > > > JiangBiao162664/user/zte_ltd Wrote 2016/08/31 10:27:34: > > > >> JiangBiao162664/user/zte_ltd > >> 2016/08/31 10:27 > >> > >> From > >> Patrik Jakobsson <patrik.r.jakobsson at gmail.com>, > >> Re: [PATCH] drm/gma500: remove the process of stolen page in page > >> fault handler. > >> > >> Patrik Jakobsson <patrik.r.jakobsson at gmail.com> wrote on 2016/08/30 > >> 18:21:08: > >> > >> > Patrik Jakobsson <patrik.r.jakobsson at gmail.com> > >> > 2016/08/30 18:21 > >> > > >> > From > >> > jiang.biao2 at zte.com.cn, > >> > cc > >> > dri-devel <dri-devel at lists.freedesktop.org> > >> > Re: [PATCH] drm/gma500: remove the process of stolen page in page > >> fault handler. > >> > > >> > On Tue, Aug 30, 2016 at 7:10 AM, <jiang.biao2 at zte.com.cn> wrote: > >> > > > >> > > Direct gtt range is used in the page fault scene in current driver, > >> > > instead of stolen page. So no need to keep relative process. > >> > > >> > Hi > >> > > >> > Are you saying that we don't use stolen memory? Afaik stolen memory > >> > should be accessed through the stolen range so we do need this. > >> > > >> > -Patrik > >> > > >> As far as I can see, the stolen memory is only used by fbdev driver > >> in gma500, > >> but the fbdev driver maps the stloen memory directly in psbfb_vm_fault, > >> not > >> using psb_gem_fault to map the stolen memory. > >> The only scenario using the psb_gem_fault is the gtt range created by > >> psb_gem_create, which alloc the gtt range without stolen memory backed. > > > >> If I missed something, pls enlighten me. > >> Thanks a lot. > > > > Hi Patrik, > > > > Could you please help to confirm my question? > > Thank you very much. > > Hi, > > The assumption that stolen memory will never be used with > psb_gem_create() might not hold true in the future and silently > breaking support for it ito save a few lines of code is not the right > way to do it. Actually, if we find use for stolen memory we would > basically get memory for free since it is already reserved for > graphics usage. > > Cheers > Patrik Understood, but maybe It's better to add it when it's actually used. Indeed, that does not that matter. Thanks for the reply. -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.freedesktop.org/archives/dri-devel/attachments/20160905/a4796298/attachment.html>
