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authorEugeni Dodonov <eugeni.dodonov@intel.com>2011-11-23 16:42:14 -0200
committerKeith Packard <keithp@keithp.com>2011-12-16 08:49:57 -0800
commit8bc1f85c02a20a59956b00b3acea12c04dce9ae8 (patch)
tree259cc3a7b192afbde9c4b2bf066f0e1a3e4b3999 /drivers
parent522200858093a6f31af9830672109f6d9807dd1e (diff)
iommu: Export intel_iommu_enabled to signal when iommu is in use
In i915 driver, we do not enable either rc6 or semaphores on SNB when dmar is enabled. The new 'intel_iommu_enabled' variable signals when the iommu code is in operation. Cc: Ted Phelps <phelps@gnusto.com> Cc: Peter <pab1612@gmail.com> Cc: Lukas Hejtmanek <xhejtman@fi.muni.cz> Cc: Andrew Lutomirski <luto@mit.edu> CC: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Eugeni Dodonov <eugeni.dodonov@intel.com> Signed-off-by: Keith Packard <keithp@keithp.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/iommu/intel-iommu.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index c0c7820d4c4..8dc19b8f5d4 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -405,6 +405,9 @@ int dmar_disabled = 0;
int dmar_disabled = 1;
#endif /*CONFIG_INTEL_IOMMU_DEFAULT_ON*/
+int intel_iommu_enabled = 0;
+EXPORT_SYMBOL_GPL(intel_iommu_enabled);
+
static int dmar_map_gfx = 1;
static int dmar_forcedac;
static int intel_iommu_strict;
@@ -3647,6 +3650,8 @@ int __init intel_iommu_init(void)
bus_register_notifier(&pci_bus_type, &device_nb);
+ intel_iommu_enabled = 1;
+
return 0;
}