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Commit 2b20cbba authored by Eric Auger's avatar Eric Auger Committed by Will Deacon
Browse files

iommu: iommu_alloc_resv_region 



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: default avatarEric Auger <eric.auger@redhat.com>
Reviewed-by: default avatarTomasz Nowicki <tomasz.nowicki@caviumnetworks.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 d30ddcaa

drivers/iommu/iommu.c

+18 −0
Original line number Diff line number Diff line
@@ -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)

{

include/linux/iommu.h

+2 −0
Original line number Diff line number Diff line
@@ -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);