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@xxxxxxxxxx>
---
drivers/iommu/iommu.c | 16 ++++++++++++++++
include/linux/iommu.h | 8 ++++++++
2 files changed, 24 insertions(+)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index c7ed334..6ee529f 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1562,6 +1562,22 @@ 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,
+ unsigned int prot)
+{
+ struct iommu_resv_region *region;
+
+ region = kzalloc(sizeof(*region), GFP_KERNEL);
+ if (!region)
+ return NULL;
+
+ region->start = start;
+ region->length = length;
+ region->prot = prot;
+ 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 02cf565..0aea877 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -241,6 +241,8 @@ 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, unsigned int prot);
extern int iommu_attach_group(struct iommu_domain *domain,
struct iommu_group *group);
@@ -454,6 +456,12 @@ static inline void iommu_put_resv_regions(struct device *dev,
{
}
+static inline struct iommu_resv_region *
+iommu_alloc_resv_region(phys_addr_t start, size_t length, unsigned int prot)
+{
+ return NULL;
+}
+
static inline int iommu_request_dm_for_dev(struct device *dev)
{
return -ENODEV;
--
1.9.1
--
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