linux-kernel - Re: [PATCH v3 3/9] drm: Update drm_addmap and drm

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Date:	Fri, 31 May 2013 13:47:26 +1000
From:	Dave Airlie <airlied@...il.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	linux-fbdev@...r.kernel.org,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Jerome Glisse <j.glisse@...il.com>,
	Alex Deucher <alexdeucher@...il.com>
Subject: Re: [PATCH v3 3/9] drm: Update drm_addmap and drm_mmap to use PAT WC
 instead of MTRRs

On Tue, May 14, 2013 at 9:58 AM, Andy Lutomirski <luto@...capital.net> wrote:
> Previously, DRM_FRAME_BUFFER mappings, as well as DRM_REGISTERS
> mappings with DRM_WRITE_COMBINING set, resulted in an unconditional
> MTRR being added but the actual mappings being created as UC-.
>
> Now these mappings have the MTRR added only if needed, but they will
> be mapped with pgprot_writecombine.
>
> The non-WC DRM_REGISTERS case now uses pgprot_noncached instead of
> hardcoding the bit twiddling.
>
> The DRM_AGP case is unchanged for now.

Just FYI this breaks on powerpc build, I've fixed it up and pushed the
fixed version to
drm-next-staging, I'll push that to drm-next in a couple of days, once
kbuild robot hits it.

Dave.
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