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>
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@ -405,6 +405,9 @@ int dmar_disabled = 0;
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int dmar_disabled = 1;
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#endif /*CONFIG_INTEL_IOMMU_DEFAULT_ON*/
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int intel_iommu_enabled = 0;
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EXPORT_SYMBOL_GPL(intel_iommu_enabled);
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static int dmar_map_gfx = 1;
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static int dmar_forcedac;
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static int intel_iommu_strict;
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@ -3647,6 +3650,8 @@ int __init intel_iommu_init(void)
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bus_register_notifier(&pci_bus_type, &device_nb);
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intel_iommu_enabled = 1;
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return 0;
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}
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@ -31,6 +31,7 @@ extern void free_dmar_iommu(struct intel_iommu *iommu);
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extern int iommu_calculate_agaw(struct intel_iommu *iommu);
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extern int iommu_calculate_max_sagaw(struct intel_iommu *iommu);
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extern int dmar_disabled;
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extern int intel_iommu_enabled;
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#else
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static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
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{
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@ -44,6 +45,7 @@ static inline void free_dmar_iommu(struct intel_iommu *iommu)
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{
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}
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#define dmar_disabled (1)
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#define intel_iommu_enabled (0)
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#endif
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