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iommu: Introduce a callback to struct iommu_resv_region

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A callback is introduced to struct iommu_resv_region to free memory
allocations associated with the reserved region. This will be useful
when we introduce support for IORT RMR based reserved regions.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: Steven Price <steven.price@arm.com>
Tested-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Tested-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/20220615101044.1972-2-shameerali.kolothum.thodi@huawei.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Shameer Kolothum 2022-06-15 11:10:36 +01:00 committed by Joerg Roedel
parent ac9a5d522b
commit 3b7e2482f9
2 changed files with 13 additions and 5 deletions
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16
drivers/iommu/iommu.c
View file

@ -2590,16 +2590,22 @@ void iommu_put_resv_regions(struct device *dev, struct list_head *list)
* @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.
* for simple reservations. If a per region callback is provided that will be
* used to free all memory allocations associated with the reserved region or
* else just free up the memory for the regions. 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);
list_for_each_entry_safe(entry, next, list, list) {
if (entry->free)
entry->free(dev, entry);
else
kfree(entry);
}
}
EXPORT_SYMBOL(generic_iommu_put_resv_regions);

2
include/linux/iommu.h
View file

@ -135,6 +135,7 @@ enum iommu_resv_type {
* @length: Length of the region in bytes
* @prot: IOMMU Protection flags (READ/WRITE/...)
* @type: Type of the reserved region
* @free: Callback to free associated memory allocations
*/
struct iommu_resv_region {
struct list_head list;
@ -142,6 +143,7 @@ struct iommu_resv_region {
size_t length;
int prot;
enum iommu_resv_type type;
void (*free)(struct device *dev, struct iommu_resv_region *region);
};
/**