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iommu: Add domain_has_cap iommu_ops

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This iommu_op can tell if domain have a specific capability, like snooping
control for Intel IOMMU, which can be used by other components of kernel to
adjust the behaviour.

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Sheng Yang
2009-03-18 15:33:06 +08:00
committed by David Woodhouse
parent 58c610bd1a
commit dbb9fd8630
4 changed files with 38 additions and 0 deletions
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12
include/linux/iommu.h
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@ -28,6 +28,8 @@ struct iommu_domain {
void *priv;
};
#define IOMMU_CAP_CACHE_COHERENCY 0x1
struct iommu_ops {
int (*domain_init)(struct iommu_domain *domain);
void (*domain_destroy)(struct iommu_domain *domain);
@ -39,6 +41,8 @@ struct iommu_ops {
size_t size);
phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,
unsigned long iova);
int (*domain_has_cap)(struct iommu_domain *domain,
unsigned long cap);
};
#ifdef CONFIG_IOMMU_API
@ -57,6 +61,8 @@ extern void iommu_unmap_range(struct iommu_domain *domain, unsigned long iova,
size_t size);
extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
unsigned long iova);
extern int iommu_domain_has_cap(struct iommu_domain *domain,
unsigned long cap);
#else /* CONFIG_IOMMU_API */
@ -107,6 +113,12 @@ static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
return 0;
}
static inline int domain_has_cap(struct iommu_domain *domain,
unsigned long cap)
{
return 0;
}
#endif /* CONFIG_IOMMU_API */
#endif /* __LINUX_IOMMU_H */