drm/i915: Conditionally carve out GGTT PDE

It only works that way on GEN6 and GEN7. Let's not assume GENn will be
the same.

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

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 0f214fb1a75f..b4ba488e5c83 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -623,9 +623,12 @@ void i915_gem_init_global_gtt(struct drm_device *dev)
 
         if (intel_enable_ppgtt(dev) && HAS_ALIASING_PPGTT(dev)) {
                 int ret;
-                /* PPGTT pdes are stolen from global gtt ptes, so shrink the
-                 * aperture accordingly when using aliasing ppgtt. */
-                gtt_size -= I915_PPGTT_PD_ENTRIES*PAGE_SIZE;
+
+                if (INTEL_INFO(dev)->gen <= 7) {
+                        /* PPGTT pdes are stolen from global gtt ptes, so shrink the
+                         * aperture accordingly when using aliasing ppgtt. */
+                        gtt_size -= I915_PPGTT_PD_ENTRIES*PAGE_SIZE;
+                }
 
                 i915_gem_setup_global_gtt(dev, 0, mappable_size, gtt_size);