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

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Date:	Sun, 23 Jan 2011 21:52:27 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Chris Wilson <chris@...is-wilson.co.uk>
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 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 ...

Thanks,
Rafael
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