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Subject[PATCH v7 05/19] iommu: iommu_alloc_resv_region
Date
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>

---

v3 -> v4:
- add INIT_LIST_HEAD(&region->list)
- use int for prot param and add int type param
- remove implementation outside of CONFIG_IOMMU_API
---
drivers/iommu/iommu.c | 18 ++++++++++++++++++
include/linux/iommu.h | 2 ++
2 files changed, 20 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 1cee5c3..927878d 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -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)
{
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 233a6bf..f6bb55d3 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -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);
--
1.9.1
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