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Commit d30ddcaa authored by Eric Auger's avatar Eric Auger Committed by Will Deacon
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iommu: Add a new type field in iommu_resv_region 



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: default avatarEric Auger <eric.auger@redhat.com>
Tested-by: default avatarTomasz Nowicki <tomasz.nowicki@caviumnetworks.com>
Tested-by: default avatarBharat Bhushan <bharat.bhushan@nxp.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent e5b5234a

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