1 files changed, 25 insertions, 7 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 62a5c3627b90..154b0f8bb88d 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -34,25 +34,35 @@ static void gen8_setup_private_ppat(struct drm_i915_private *dev_priv);
 
 bool intel_enable_ppgtt(struct drm_device *dev, bool full)
 {
-        if (i915.enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev))
+        if (i915.enable_ppgtt == 0)
                 return false;
 
         if (i915.enable_ppgtt == 1 && full)
                 return false;
 
+        return true;
+}
+
+static int sanitize_enable_ppgtt(struct drm_device *dev, int enable_ppgtt)
+{
+        if (enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev))
+                return 0;
+
+        if (enable_ppgtt == 1)
+                return 1;
+
+        if (enable_ppgtt == 2 && HAS_PPGTT(dev))
+                return 2;
+
 #ifdef CONFIG_INTEL_IOMMU
         /* Disable ppgtt on SNB if VT-d is on. */
         if (INTEL_INFO(dev)->gen == 6 && intel_iommu_gfx_mapped) {
                 DRM_INFO("Disabling PPGTT because VT-d is on\n");
-                return false;
+                return 0;
         }
 #endif
 
-        /* Full ppgtt disabled by default for now due to issues. */
-        if (full)
-                return HAS_PPGTT(dev) && (i915.enable_ppgtt == 2);
-        else
-                return HAS_ALIASING_PPGTT(dev);
+        return HAS_ALIASING_PPGTT(dev) ? 1 : 0;
 }
 
 #define GEN6_PPGTT_PD_ENTRIES 512
@@ -2031,6 +2041,14 @@ int i915_gem_gtt_init(struct drm_device *dev)
                  gtt->base.total >> 20);
         DRM_DEBUG_DRIVER("GMADR size = %ldM\n", gtt->mappable_end >> 20);
         DRM_DEBUG_DRIVER("GTT stolen size = %zdM\n", gtt->stolen_size >> 20);
+        /*
+         * i915.enable_ppgtt is read-only, so do an early pass to validate the
+         * user's requested state against the hardware/driver capabilities.  We
+         * do this now so that we can print out any log messages once rather
+         * than every time we check intel_enable_ppgtt().
+         */
+        i915.enable_ppgtt = sanitize_enable_ppgtt(dev, i915.enable_ppgtt);
+        DRM_DEBUG_DRIVER("ppgtt mode: %i\n", i915.enable_ppgtt);
 
         return 0;
 }