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Subject[PATCH] drm/i915: disable ppgtt on snb when dmar is enabled
Date
Totally unexpected that this regressed. Luckily it sounds like we just
need to have dmar disable on the igfx, not the entire system. At least
that's what a few days of testing between Tony Vroon and me indicates.

Reported-by: Tony Vroon <tony@linx.net>
Cc: Tony Vroon <tony@linx.net>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=43024
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
drivers/char/agp/intel-gtt.c | 1 -
drivers/gpu/drm/i915/i915_dma.c | 17 ++++++++++++++++-
drivers/gpu/drm/i915/i915_drv.c | 4 ++--
drivers/gpu/drm/i915/i915_drv.h | 2 +-
include/drm/intel-gtt.h | 4 ++++
5 files changed, 23 insertions(+), 5 deletions(-)
diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
index 7e223a2..e086fa5 100644
--- a/drivers/char/agp/intel-gtt.c
+++ b/drivers/char/agp/intel-gtt.c
@@ -1204,7 +1204,6 @@ static inline int needs_idle_maps(void)
{
#ifdef CONFIG_INTEL_IOMMU
const unsigned short gpu_devid = intel_private.pcidev->device;
- extern int intel_iommu_gfx_mapped;

/* Query intel_iommu to see if we need the workaround. Presumably that
* was loaded first.
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 4636391..ee06241 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1189,6 +1189,21 @@ static bool i915_switcheroo_can_switch(struct pci_dev *pdev)
return can_switch;
}

+static bool
+intel_enable_ppgtt(struct drm_device *dev)
+{
+ if (i915_enable_ppgtt >= 0)
+ return i915_enable_ppgtt;
+
+#ifdef CONFIG_INTEL_IOMMU
+ /* Disable ppgtt on SNB if VT-d is on. */
+ if (INTEL_INFO(dev)->gen == 6 && intel_iommu_gfx_mapped)
+ return false;
+#endif
+
+ return true;
+}
+
static int i915_load_gem_init(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@@ -1203,7 +1218,7 @@ static int i915_load_gem_init(struct drm_device *dev)
drm_mm_init(&dev_priv->mm.stolen, 0, prealloc_size);

mutex_lock(&dev->struct_mutex);
- if (i915_enable_ppgtt && HAS_ALIASING_PPGTT(dev)) {
+ if (intel_enable_ppgtt(dev) && HAS_ALIASING_PPGTT(dev)) {
/* 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;
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 0efc02e..c65907e 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -109,8 +109,8 @@ MODULE_PARM_DESC(enable_hangcheck,
"WARNING: Disabling this can cause system wide hangs. "
"(default: true)");

-bool i915_enable_ppgtt __read_mostly = 1;
-module_param_named(i915_enable_ppgtt, i915_enable_ppgtt, bool, 0600);
+int i915_enable_ppgtt __read_mostly = -1;
+module_param_named(i915_enable_ppgtt, i915_enable_ppgtt, int, 0600);
MODULE_PARM_DESC(i915_enable_ppgtt,
"Enable PPGTT (default: true)");

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index b617cd5..1c8c440 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1088,7 +1088,7 @@ extern int i915_vbt_sdvo_panel_type __read_mostly;
extern int i915_enable_rc6 __read_mostly;
extern int i915_enable_fbc __read_mostly;
extern bool i915_enable_hangcheck __read_mostly;
-extern bool i915_enable_ppgtt __read_mostly;
+extern int i915_enable_ppgtt __read_mostly;

extern int i915_suspend(struct drm_device *dev, pm_message_t state);
extern int i915_resume(struct drm_device *dev);
diff --git a/include/drm/intel-gtt.h b/include/drm/intel-gtt.h
index 0a0001b..923afb5 100644
--- a/include/drm/intel-gtt.h
+++ b/include/drm/intel-gtt.h
@@ -44,4 +44,8 @@ void intel_gtt_insert_pages(unsigned int first_entry, unsigned int num_entries,
/* flag for GFDT type */
#define AGP_USER_CACHED_MEMORY_GFDT (1 << 3)

+#ifdef CONFIG_INTEL_IOMMU
+extern int intel_iommu_gfx_mapped;
+#endif
+
#endif
--
1.7.7.6


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