linux-kernel - Re: [PATCH 1/1] Use cachable mapping for i915 opregion.

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Message-Id: <849307$b97gn8@azsmga001.ch.intel.com>
Date:	Sun, 23 Jan 2011 20:58:56 +0000
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Michael Karcher <kernel@...rcher.dialup.fu-berlin.de>,
	airlied@...ux.ie, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] Use cachable mapping for i915 opregion.

On Sun, 23 Jan 2011 21:52:27 +0100, "Rafael J. Wysocki" <rjw@...k.pl> wrote:
> On Sunday, January 23, 2011, Chris Wilson wrote:
> > On Sun, 23 Jan 2011 18:23:34 +0100, Michael Karcher <kernel@...rcher.dialup.fu-berlin.de> wrote:
> > > The opregion is a shared memory region between ACPI and the graphics
> > > driver. As the ACPI mapping has been changed to cachable in commit
> > > 6d5bbf00d251cc73223a71422d69e069dc2e0b8d, mapping the intel opregion
> > > non-cachable now fails. As no bus-master hardware is involved in the
> > > opregion, cachable map should do no harm.
> > 
> > Satisfied myself that is indeed equivalent to use the newly introduced
> > acpi_os_ioremap for this purpose and applied to -fixes.
> 
> However, it might be better to use acpi_os_ioremap() in case we decide to
> go back to ioremap() for some reason.  For now, ioremap_cache() seems fine,
> but ...

Great minds think a like, but fools rarely differ...
http://git.kernel.org/?p=linux/kernel/git/ickle/drm-intel.git;a=commit;h=94b3eb7a71fe62f19c91c39dd94c83786108d626
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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