From: "Michel Dänzer" <michel@daenzer•net>
To: Gerhard Pircher <gerhard_pircher@gmx•net>
Cc: schwab@linux-m68k•org, ojordan12345@hotmail•co.uk,
linuxppc-dev@lists•ozlabs.org
Subject: Re: PowerPC radeon KMS - is it possible?
Date: Wed, 18 Apr 2012 18:06:36 +0200 [thread overview]
Message-ID: <1334765196.5989.336.camel@thor.local> (raw)
In-Reply-To: <20120418154916.128350@gmx.net>
On Mit, 2012-04-18 at 17:49 +0200, Gerhard Pircher wrote:=20
> > Von: "Michel D=C3=A4nzer" <michel@daenzer•net>
> > On Mit, 2012-04-18 at 16:55 +0200, Andreas Schwab wrote:=20
> > > Michel D=C3=A4nzer <michel@daenzer•net> writes:
> > >=20
> > > > On Mit, 2012-04-18 at 16:28 +0200, Andreas Schwab wrote:=20
> > > >> Michel D=C3=A4nzer <michel@daenzer•net> writes:
> > > >>=20
> > > >> > Have you tried smaller aperture sizes (uninorth_agp.aperture)
> > > >> > and/or radeon.test=3D1? (See commit
> > > >> > 52f072cb084bbb460d3a4ae09f0b6efc3e7e8a8c)
> > > >>=20
> > > >> Neither changes anything.
> > > >
> > > > How small aperture sizes have you tried?
> > >=20
> > > 32M. With the old UMS driver 3D once worked fine ...
> >=20
> > 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 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.
--=20
Earthling Michel D=C3=A4nzer | http://www.amd.c=
om
Libre software enthusiast | Debian, X and DRI developer
next prev parent reply other threads:[~2012-04-18 16:06 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-17 19:49 PowerPC radeon KMS - is it possible? o jordan
2012-04-18 6:35 ` Michel Dänzer
2012-04-18 6:59 ` Benjamin Herrenschmidt
[not found] ` <1334732346.1159.5.camel__22339.9641145535$1334732429$gmane$org@pasglop>
2012-04-18 7:46 ` Andreas Schwab
2012-04-18 10:35 ` Benjamin Herrenschmidt
2012-04-18 10:37 ` Benjamin Herrenschmidt
2012-04-18 10:54 ` Michel Dänzer
2012-04-18 11:23 ` Benjamin Herrenschmidt
2012-04-18 13:07 ` Michel Dänzer
2012-04-18 22:25 ` Benjamin Herrenschmidt
[not found] ` <1334730915.5989.265.camel__41553.0639271767$1334731329$gmane$org@thor.local>
2012-04-18 7:42 ` Andreas Schwab
2012-04-18 7:52 ` Michel Dänzer
2012-04-18 11:25 ` Andreas Schwab
2012-04-18 13:02 ` Michel Dänzer
2012-04-18 13:22 ` Andreas Schwab
2012-04-18 13:25 ` Michel Dänzer
2012-04-18 13:47 ` Andreas Schwab
2012-04-18 7:54 ` Andreas Schwab
2012-04-18 8:02 ` Michel Dänzer
2012-04-18 10:20 ` Benjamin Herrenschmidt
2012-04-18 10:34 ` Michel Dänzer
2012-04-18 10:44 ` Michel Dänzer
2012-04-18 11:19 ` Benjamin Herrenschmidt
2012-04-18 13:08 ` Michel Dänzer
2012-04-18 12:49 ` Andreas Schwab
2012-04-18 11:17 ` Benjamin Herrenschmidt
2012-04-18 13:27 ` Michel Dänzer
2012-04-18 11:30 ` Andreas Schwab
2012-04-18 13:38 ` Michel Dänzer
2012-04-18 14:28 ` Andreas Schwab
2012-04-18 14:31 ` Michel Dänzer
2012-04-18 14:55 ` Andreas Schwab
2012-04-18 15:01 ` Michel Dänzer
2012-04-18 15:49 ` Gerhard Pircher
2012-04-18 16:06 ` Michel Dänzer [this message]
2012-04-18 16:23 ` Gerhard Pircher
2012-04-19 6:32 ` Michel Dänzer
2012-04-19 11:48 ` Gerhard Pircher
2012-04-19 12:41 ` Michel Dänzer
2012-04-18 15:39 ` Andreas Schwab
-- strict thread matches above, loose matches on Subject: below --
2012-04-20 11:15 Gerhard Pircher
2012-04-20 13:18 ` Michel Dänzer
2012-04-20 16:14 ` Gerhard Pircher
2012-04-23 9:56 ` Michel Dänzer
2012-04-23 16:45 ` Gerhard Pircher
2012-04-24 14:15 ` Michel Dänzer
2012-04-24 17:10 ` Gerhard Pircher
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