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iommu: Add a new type field in iommu_resv_region

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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>
This commit is contained in:
Eric Auger 2017-01-19 20:57:48 +00:00 committed by Will Deacon
parent e5b5234a36
commit d30ddcaa7b
2 changed files with 8 additions and 0 deletions
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1
drivers/iommu/amd_iommu.c
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@ -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)

7
include/linux/iommu.h
View File

@ -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