drm/i915: Allow full PPGTT with param override

When PPGTT was disabled by default, the patch also prevented the user
from overriding this behavior via module parameter. Being able to test
this on arbitrary kernels is extremely beneficial to track down the
remaining bugs. The patch that prevented this was:

commit cfc6e215fe8d1c95a770d30d4874bda733b065a9
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Thu Mar 6 09:40:43 2014 +0100

    drm/i915: Disable full ppgtt by default

By default PPGTT is set to -1. 0 means off, 1 means aliasing only, 2
means full, all other values are reserved.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 0334cf20b3db413c6f3af966f3129f129258fe7d..b31cde1d5979bcdebeb6bb7123dd5c6809780681 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -50,7 +50,7 @@ bool intel_enable_ppgtt(struct drm_device *dev, bool full)
 
        /* Full ppgtt disabled by default for now due to issues. */
        if (full)
-               return false; /* HAS_PPGTT(dev) */
+               return HAS_PPGTT(dev) && (i915.enable_ppgtt == 2);
        else
                return HAS_ALIASING_PPGTT(dev);
 }