-------- Original-Nachricht -------- > Datum: Wed, 18 Apr 2012 18:06:36 +0200 > Von: "Michel Dänzer" <mic...@daenzer.net> > An: Gerhard Pircher <gerhard_pirc...@gmx.net> > CC: linuxppc-dev@lists.ozlabs.org, sch...@linux-m68k.org, > ojordan12...@hotmail.co.uk > Betreff: Re: PowerPC radeon KMS - is it possible?
> On Mit, 2012-04-18 at 17:49 +0200, Gerhard Pircher wrote: > > > Von: "Michel Dänzer" <mic...@daenzer.net> > > > On Mit, 2012-04-18 at 16:55 +0200, Andreas Schwab wrote: > > > > Michel Dänzer <mic...@daenzer.net> writes: > > > > > > > > > On Mit, 2012-04-18 at 16:28 +0200, Andreas Schwab wrote: > > > > >> Michel Dänzer <mic...@daenzer.net> writes: > > > > >> > > > > >> > Have you tried smaller aperture sizes (uninorth_agp.aperture) > > > > >> > and/or radeon.test=1? (See commit > > > > >> > 52f072cb084bbb460d3a4ae09f0b6efc3e7e8a8c) > > > > >> > > > > >> Neither changes anything. > > > > > > > > > > How small aperture sizes have you tried? > > > > > > > > 32M. With the old UMS driver 3D once worked fine ... > > > > > > That doesn't necessarily mean much per se, as with UMS memory is > > > only statically mapped into the AGP GART once (so most of those > > > 32M are wasted at least most of the time), whereas with KMS it's > > > dynamically (un)mapped on demand. > > That may be a stupid question, but is it allowed (for a DRM client or > > whatever does the mapping) to change the content of a page mapped into > > the AGP GART or is it necessary to explicitly unmap the page, change > > its content and map it again? > > The former. I know that the uninorth AGPGART driver does a cache flushing for newly mapped pages, but is there any code in the driver that handles the former case (or isn't this necessary on PPC Macs)? > > I would say it's necessary to unmap the page first (sounds more like > > the pci_[un]map_page() approach) - at least when it should work with > > non-coherent architectures, too. > > I'm afraid non-coherent platforms haven't really been a concern yet for > KMS, and always doing the above dance would probably have a significant > performance impact on coherent platforms. Are there any plans for a page flushing API? I suppose that wouldn't have such a big performance impact on coherent platforms (but probably an impact on the userspace API). Thanks! Gerhard -- Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
