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iommu: Implement generic_iommu_put_resv_regions()

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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: Thierry Reding <treding@nvidia.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Thierry Reding
2019-12-18 14:42:01 +01:00
committed by Joerg Roedel
parent 944c917539
commit f9f6971ebb
2 changed files with 21 additions and 0 deletions
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19
drivers/iommu/iommu.c
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@@ -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)