Commit f9f6971e authored by Thierry Reding's avatar Thierry Reding Committed by Joerg Roedel
Browse files

iommu: Implement generic_iommu_put_resv_regions() 



Implement a generic function for removing reserved regions. This can be
used by drivers that don't do anything fancy with these regions other
than allocating memory for them.

Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 944c9175

drivers/iommu/iommu.c

+19 −0
Original line number Diff line number Diff line
@@ -2229,6 +2229,25 @@ void iommu_put_resv_regions(struct device *dev, struct list_head *list) 
		ops->put_resv_regions(dev, list);

}



/**

 * generic_iommu_put_resv_regions - Reserved region driver helper

 * @dev: device for which to free reserved regions

 * @list: reserved region list for device

 *

 * IOMMU drivers can use this to implement their .put_resv_regions() callback

 * for simple reservations. Memory allocated for each reserved region will be

 * freed. If an IOMMU driver allocates additional resources per region, it is

 * going to have to implement a custom callback.

 */

void generic_iommu_put_resv_regions(struct device *dev, struct list_head *list)

{

	struct iommu_resv_region *entry, *next;



	list_for_each_entry_safe(entry, next, list, list)

		kfree(entry);

}

EXPORT_SYMBOL(generic_iommu_put_resv_regions);



struct iommu_resv_region *iommu_alloc_resv_region(phys_addr_t start,

						  size_t length, int prot,

						  enum iommu_resv_type type)

include/linux/iommu.h

+2 −0
Original line number Diff line number Diff line
@@ -456,6 +456,8 @@ 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 void generic_iommu_put_resv_regions(struct device *dev,

					   struct list_head *list);

extern int iommu_request_dm_for_dev(struct device *dev);

extern int iommu_request_dma_domain_for_dev(struct device *dev);

extern void iommu_set_default_passthrough(bool cmd_line);

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