This api return the iommu domain to which the device is attached.
The iommu_domain is required for making API calls related to iommu.
Follow up patches which use this API to know iommu maping.
Signed-off-by: Bharat Bhushan <bharat.bhus...@freescale.com>
---
drivers/iommu/iommu.c | 10 ++++++++++
include/linux/iommu.h | 7 +++++++
2 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index fbe9ca7..6ac5f50 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -696,6 +696,16 @@ void iommu_detach_device(struct iommu_domain *domain,
struct device *dev)
}
EXPORT_SYMBOL_GPL(iommu_detach_device);
+struct iommu_domain *iommu_get_dev_domain(struct device *dev)
+{
+ struct iommu_ops *ops = dev->bus->iommu_ops;
+
+ if (unlikely(ops == NULL || ops->get_dev_iommu_domain == NULL))
+ return NULL;
+
+ return ops->get_dev_iommu_domain(dev);
+}
+EXPORT_SYMBOL_GPL(iommu_get_dev_domain);
/*
* IOMMU groups are really the natrual working unit of the IOMMU, but
* the IOMMU API works on domains and devices. Bridge that gap by
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 7ea319e..fa046bd 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -127,6 +127,7 @@ struct iommu_ops {
int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count);
/* Get the numer of window per domain */
u32 (*domain_get_windows)(struct iommu_domain *domain);
+ struct iommu_domain *(*get_dev_iommu_domain)(struct device *dev);
unsigned long pgsize_bitmap;
};
@@ -190,6 +191,7 @@ extern int iommu_domain_window_enable(struct iommu_domain
*domain, u32 wnd_nr,
phys_addr_t offset, u64 size,
int prot);
extern void iommu_domain_window_disable(struct iommu_domain *domain, u32
wnd_nr);
+extern struct iommu_domain *iommu_get_dev_domain(struct device *dev);
/**
* report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
* @domain: the iommu domain where the fault has happened
@@ -284,6 +286,11 @@ static inline void iommu_domain_window_disable(struct
iommu_domain *domain,
{
}
+static inline struct iommu_domain *iommu_get_dev_domain(struct device *dev)
+{
+ return NULL;
+}
+
static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
dma_addr_t iova)
{
return 0;
--
1.7.0.4
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