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iommu: Add domain-attribute handlers 

This patch introduces an extension to the iommu-api to get
and set attributes for an iommu_domain. Two functions are
introduced for this:

	* iommu_domain_get_attr()
	* iommu_domain_set_attr()

These functions will be used to make the iommu-api suitable
for GART-like IOMMUs and to implement hardware-specifc
api-extensions.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2012-01-26 19:40:52 +01:00
parent bd0a521e88
commit 0cd76dd13b
2 changed files with 47 additions and 1 deletions
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20
drivers/iommu/iommu.c
View File

@ -344,3 +344,23 @@ int iommu_device_group(struct device *dev, unsigned int *groupid)
return -ENODEV;
}
EXPORT_SYMBOL_GPL(iommu_device_group);
int iommu_domain_get_attr(struct iommu_domain *domain,
enum iommu_attr attr, void *data)
{
if (!domain->ops->domain_get_attr)
return -EINVAL;
return domain->ops->domain_get_attr(domain, attr, data);
}
EXPORT_SYMBOL_GPL(iommu_domain_get_attr);
int iommu_domain_set_attr(struct iommu_domain *domain,
enum iommu_attr attr, void *data)
{
if (!domain->ops->domain_set_attr)
return -EINVAL;
return domain->ops->domain_set_attr(domain, attr, data);
}
EXPORT_SYMBOL_GPL(iommu_domain_set_attr);

28
include/linux/iommu.h
View File

@ -47,6 +47,10 @@ struct iommu_domain {
#define IOMMU_CAP_CACHE_COHERENCY 0x1
#define IOMMU_CAP_INTR_REMAP 0x2 /* isolates device intrs */
enum iommu_attr {
DOMAIN_ATTR_MAX,
};
#ifdef CONFIG_IOMMU_API
/**
@ -59,7 +63,8 @@ struct iommu_domain {
* @unmap: unmap a physically contiguous memory region from an iommu domain
* @iova_to_phys: translate iova to physical address
* @domain_has_cap: domain capabilities query
* @commit: commit iommu domain
* @domain_get_attr: Query domain attributes
* @domain_set_attr: Change domain attributes
* @pgsize_bitmap: bitmap of supported page sizes
*/
struct iommu_ops {
@ -76,6 +81,10 @@ struct iommu_ops {
int (*domain_has_cap)(struct iommu_domain *domain,
unsigned long cap);
int (*device_group)(struct device *dev, unsigned int *groupid);
int (*domain_get_attr)(struct iommu_domain *domain,
enum iommu_attr attr, void *data);
int (*domain_set_attr)(struct iommu_domain *domain,
enum iommu_attr attr, void *data);
unsigned long pgsize_bitmap;
};
@ -99,6 +108,11 @@ extern void iommu_set_fault_handler(struct iommu_domain *domain,
iommu_fault_handler_t handler, void *token);
extern int iommu_device_group(struct device *dev, unsigned int *groupid);
extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
void *data);
extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
void *data);
/**
* report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
* @domain: the iommu domain where the fault has happened
@ -202,6 +216,18 @@ static inline int iommu_device_group(struct device *dev, unsigned int *groupid)
return -ENODEV;
}
static inline int iommu_domain_get_attr(struct iommu_domain *domain,
enum iommu_attr attr, void *data)
{
return -EINVAL;
}
static inline int iommu_domain_set_attr(struct iommu_domain *domain,
enum iommu_attr attr, void *data)
{
return -EINVAL;
}
#endif /* CONFIG_IOMMU_API */
#endif /* __LINUX_IOMMU_H */