Subject: Re: PowerPC radeon KMS - is it possible?

From: "Gerhard Pircher" <[email-masked]>
Date: Wed, 18 Apr 2012 17:49:16 +0200

-------- Original-Nachricht --------
> Datum: Wed, 18 Apr 2012 17:01:20 +0200
> Von: "Michel Dänzer" <[email-masked]>
> An: Andreas Schwab <[email-masked]>
> CC: o jordan <[email-masked]>, [email-masked]
> Betreff: Re: PowerPC radeon KMS - is it possible?

> On Mit, 2012-04-18 at 16:55 +0200, Andreas Schwab wrote: 
> > Michel Dänzer <[email-masked]> writes:
> > 
> > > On Mit, 2012-04-18 at 16:28 +0200, Andreas Schwab wrote: 
> > >> Michel Dänzer <[email-masked]> 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?
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.

Gerhard

PS: Sorry for hijacking the thread. :-)
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