iommu/arm-smmu: caps: add IOMMU_CAP_INTR_REMAP capability (d0948945) · Commits · 戴 / test

MSIs are just seen as bog standard memory writes by the ARM SMMU, so they can be translated (and isolated) in the same way. This patch adds the IOMMU_CAP_INTR_REMAP capability to the ARM SMMU driver and reworks our capabaility code so that we don't assume the caps are organised as bits in a bitmask (since this isn't the intention). Signed-off-by:

Will Deacon <will.deacon@arm.com>

drivers/iommu/arm-smmu.c

+9 −5

Original line number	Diff line number	Diff line
		@@ -1606,13 +1606,17 @@ static phys_addr_t arm_smmu_iova_to_phys(struct iommu_domain *domain,
		static int arm_smmu_domain_has_cap(struct iommu_domain *domain,
		unsigned long cap)
		{
		unsigned long caps = 0;
		struct arm_smmu_domain *smmu_domain = domain->priv;
		u32 features = smmu_domain->root_cfg.smmu->features;

		if (smmu_domain->root_cfg.smmu->features & ARM_SMMU_FEAT_COHERENT_WALK)
		caps \|= IOMMU_CAP_CACHE_COHERENCY;

		return !!(cap & caps);
		switch (cap) {
		case IOMMU_CAP_CACHE_COHERENCY:
		return features & ARM_SMMU_FEAT_COHERENT_WALK;
		case IOMMU_CAP_INTR_REMAP:
		return 1; /* MSIs are just memory writes */
		default:
		return 0;
		}
		}

		static int __arm_smmu_get_pci_sid(struct pci_dev pdev, u16 alias, void data)

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