Merge branch 'drm-intel-next' of git://people.freedesktop.org/~keithp/linux into drm-core-next

* 'drm-intel-next' of git://people.freedesktop.org/~keithp/linux: (72 commits)
  drm/i915/dp: Fix eDP on PCH DP on CPT/PPT
  drm/i915/dp: Introduce is_cpu_edp()
  drm/i915: use correct SPD type value
  drm/i915: fix ILK+ infoframe support
  drm/i915: add DP test request handling
  drm/i915: read full receiver capability field during DP hot plug
  drm/i915/dp: Remove eDP special cases from bandwidth checks
  drm/i915/dp: Fix the math in intel_dp_link_required
  drm/i915/panel: Always record the backlight level again (but cleverly)
  i915: Move i915_read/write out of line
  drm/i915: remove transcoder PLL mashing from mode_set per specs
  drm/i915: if transcoder disable fails, say which
  drm/i915: set watermarks for third pipe on IVB
  drm/i915: export a CPT mode set verification function
  drm/i915: fix transcoder PLL select masking
  drm/i915: fix IVB cursor support
  drm/i915: fix debug output for 3 pipe configs
  drm/i915: add PLL sharing support to handle 3 pipes
  drm/i915: fix PCH PLL assertion check for 3 pipes
  drm/i915: use transcoder select bits on VGA and HDMI on CPT
  ...

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
index 85151019dde1..80a7ed0a7df5 100644
--- a/drivers/char/agp/intel-gtt.c
+++ b/drivers/char/agp/intel-gtt.c
@@ -923,6 +923,9 @@ static int intel_fake_agp_insert_entries(struct agp_memory *mem,
 {
         int ret = -EINVAL;
 
+        if (intel_private.base.do_idle_maps)
+                return -ENODEV;
+
         if (intel_private.clear_fake_agp) {
                 int start = intel_private.base.stolen_size / PAGE_SIZE;
                 int end = intel_private.base.gtt_mappable_entries;
@@ -985,6 +988,9 @@ static int intel_fake_agp_remove_entries(struct agp_memory *mem,
         if (mem->page_count == 0)
                 return 0;
 
+        if (intel_private.base.do_idle_maps)
+                return -ENODEV;
+
         intel_gtt_clear_range(pg_start, mem->page_count);
 
         if (intel_private.base.needs_dmar) {
@@ -1177,6 +1183,25 @@ static void gen6_cleanup(void)
 {
 }
 
+/* Certain Gen5 chipsets require require idling the GPU before
+ * unmapping anything from the GTT when VT-d is enabled.
+ */
+extern int intel_iommu_gfx_mapped;
+static inline int needs_idle_maps(void)
+{
+        const unsigned short gpu_devid = intel_private.pcidev->device;
+
+        /* Query intel_iommu to see if we need the workaround. Presumably that
+         * was loaded first.
+         */
+        if ((gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_M_HB ||
+             gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG) &&
+             intel_iommu_gfx_mapped)
+                return 1;
+
+        return 0;
+}
+
 static int i9xx_setup(void)
 {
         u32 reg_addr;
@@ -1211,6 +1236,9 @@ static int i9xx_setup(void)
                 intel_private.gtt_bus_addr = reg_addr + gtt_offset;
         }
 
+        if (needs_idle_maps());
+                intel_private.base.do_idle_maps = 1;
+
         intel_i9xx_setup_flush();
 
         return 0;