From: Alex Deucher <alexander.deucher@amd.com>
Date: Mon, 4 Mar 2013 17:47:46 +0000 (-0500)
Subject: drm/radeon: implement simple doorbell page allocator
X-Git-Tag: v3.11-rc1~65^2~60^2~116
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=75efdee11b5da3acbbeb43a9b93a9c4fe6d5bec8;p=pandora-kernel.git

drm/radeon: implement simple doorbell page allocator

The doorbell aperture is a PCI BAR whose pages can be
mapped to compute resources for things like wptrs
for userspace queues.

This patch maps the BAR and sets up a simple allocator
to allocate pages from the BAR.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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