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iommu-api: Extension to check for interrupt remapping 

This patch allows IOMMU users to determine whether the
hardware and software support safe, isolated interrupt
remapping.  Not all Intel IOMMUs have the hardware, and the
software for AMD is not there yet.

Signed-off-by: Tom Lyon <pugs@cisco.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Tom Lyon 2010-07-02 16:56:14 -04:00 committed by Joerg Roedel
parent 1c5474a65b
commit 323f99cbc3
2 changed files with 3 additions and 0 deletions
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2
drivers/pci/intel-iommu.c
View File

@ -3698,6 +3698,8 @@ static int intel_iommu_domain_has_cap(struct iommu_domain *domain,
if (cap == IOMMU_CAP_CACHE_COHERENCY) if (cap == IOMMU_CAP_CACHE_COHERENCY)
return dmar_domain->iommu_snooping; return dmar_domain->iommu_snooping;
if (cap == IOMMU_CAP_INTR_REMAP)
return intr_remapping_enabled;
return 0; return 0;
} }

1
include/linux/iommu.h
View File

@ -30,6 +30,7 @@ struct iommu_domain {
}; };
#define IOMMU_CAP_CACHE_COHERENCY 0x1 #define IOMMU_CAP_CACHE_COHERENCY 0x1
#define IOMMU_CAP_INTR_REMAP 0x2 /* isolates device intrs */
struct iommu_ops { struct iommu_ops {
int (*domain_init)(struct iommu_domain *domain); int (*domain_init)(struct iommu_domain *domain);