iommu: Add a new type field in iommu_resv_region (d30ddcaa) · Commits · 戴 / test

We introduce a new field to differentiate the reserved region types and specialize the apply_resv_region implementation. Legacy direct mapped regions have IOMMU_RESV_DIRECT type. We introduce 2 new reserved memory types: - IOMMU_RESV_MSI will characterize MSI regions that are mapped - IOMMU_RESV_RESERVED characterize regions that cannot by mapped. Signed-off-by:

Eric Auger <eric.auger@redhat.com> Tested-by:

Tomasz Nowicki <tomasz.nowicki@caviumnetworks.com> Tested-by:

Bharat Bhushan <bharat.bhushan@nxp.com> Signed-off-by:

Will Deacon <will.deacon@arm.com>

drivers/iommu/amd_iommu.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -3186,6 +3186,7 @@ static void amd_iommu_get_resv_regions(struct device *dev,

		region->start = entry->address_start;
		region->length = entry->address_end - entry->address_start;
		region->type = IOMMU_RESV_DIRECT;
		if (entry->prot & IOMMU_PROT_IR)
		region->prot \|= IOMMU_READ;
		if (entry->prot & IOMMU_PROT_IW)

include/linux/iommu.h

+7 −0

Original line number	Diff line number	Diff line
		@@ -117,18 +117,25 @@ enum iommu_attr {
		DOMAIN_ATTR_MAX,
		};

		/* These are the possible reserved region types */
		#define IOMMU_RESV_DIRECT (1 << 0)
		#define IOMMU_RESV_RESERVED (1 << 1)
		#define IOMMU_RESV_MSI (1 << 2)

		/**
		* struct iommu_resv_region - descriptor for a reserved memory region
		* @list: Linked list pointers
		* @start: System physical start address of the region
		* @length: Length of the region in bytes
		* @prot: IOMMU Protection flags (READ/WRITE/...)
		* @type: Type of the reserved region
		*/
		struct iommu_resv_region {
		struct list_head list;
		phys_addr_t start;
		size_t length;
		int prot;
		int type;
		};

		#ifdef CONFIG_IOMMU_API

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