From: Thomas Hellstrom <thellstrom@vmware.com>
Date: Fri, 31 Jan 2014 09:21:10 +0000 (+0100)
Subject: drm/vmwgfx: Detect old user-space drivers and set up legacy emulation v2
X-Git-Tag: v3.14-rc2~19^2~1^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a6fc955ff9fc60dcffc80003410a85d874e4f1e3;p=pandora-kernel.git

drm/vmwgfx: Detect old user-space drivers and set up legacy emulation v2

GB aware mesa userspace drivers are detected by the fact that they are
calling the vmw getparam ioctl querying DRM_VMW_PARAM_HW_CAPS to detect
whether the device is Guest-backed object capable. For other drivers,
lie about hardware version and send the 3D capabilities in a format they
expect.

v2:
Use DRM_VMW_PARAM_MAX_MOB_MEMORY to detect gb awareness,
Make sure we don't ovwerwrite bounce buffer or write past user-space buffer
indicated size.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>
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