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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>
This commit is contained in:
Eugeni Dodonov 2011-11-23 16:42:14 -02:00 committed by Keith Packard
parent 5222008580
commit 8bc1f85c02
2 changed files with 7 additions and 0 deletions
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5
drivers/iommu/intel-iommu.c
View File

@ -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;
}

2
include/linux/dma_remapping.h
View File

@ -31,6 +31,7 @@ extern void free_dmar_iommu(struct intel_iommu *iommu);
extern int iommu_calculate_agaw(struct intel_iommu *iommu);
extern int iommu_calculate_max_sagaw(struct intel_iommu *iommu);
extern int dmar_disabled;
extern int intel_iommu_enabled;
#else
static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
{
@ -44,6 +45,7 @@ static inline void free_dmar_iommu(struct intel_iommu *iommu)
{
}
#define dmar_disabled (1)
#define intel_iommu_enabled (0)
#endif