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 <[e-mail]>
Signed-off-by: Joerg Roedel <[e-mail]>

drivers/pci/intel-iommu.c

···
 
 	if (cap == IOMMU_CAP_CACHE_COHERENCY)
 		return dmar_domain->iommu_snooping;
+	if (cap == IOMMU_CAP_INTR_REMAP)
+		return intr_remapping_enabled;
 
 	return 0;
 }

include/linux/iommu.h

···
 };
 
 #define IOMMU_CAP_CACHE_COHERENCY	0x1
+#define IOMMU_CAP_INTR_REMAP		0x2	/* isolates device intrs */
 
 struct iommu_ops {
 	int (*domain_init)(struct iommu_domain *domain);