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iommu: iommu_alloc_resv_region

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Introduce a new helper serving the purpose to allocate a reserved
region. This will be used in iommu driver implementing reserved
region callbacks.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Tomasz Nowicki <tomasz.nowicki@caviumnetworks.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 20:57:49 +00:00 committed by Will Deacon
parent d30ddcaa7b
commit 2b20cbba33
2 changed files with 20 additions and 0 deletions
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18
drivers/iommu/iommu.c
View File

@ -1575,6 +1575,24 @@ void iommu_put_resv_regions(struct device *dev, struct list_head *list)
ops->put_resv_regions(dev, list);
}
struct iommu_resv_region *iommu_alloc_resv_region(phys_addr_t start,
size_t length,
int prot, int type)
{
struct iommu_resv_region *region;
region = kzalloc(sizeof(*region), GFP_KERNEL);
if (!region)
return NULL;
INIT_LIST_HEAD(&region->list);
region->start = start;
region->length = length;
region->prot = prot;
region->type = type;
return region;
}
/* Request that a device is direct mapped by the IOMMU */
int iommu_request_dm_for_dev(struct device *dev)
{

2
include/linux/iommu.h
View File

@ -244,6 +244,8 @@ extern void iommu_set_fault_handler(struct iommu_domain *domain,
extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
extern int iommu_request_dm_for_dev(struct device *dev);
extern struct iommu_resv_region *
iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot, int type);
extern int iommu_attach_group(struct iommu_domain *domain,
struct iommu_group *group);