diff options
| -rw-r--r-- | drivers/iommu/iommu.c | 18 | ||||
| -rw-r--r-- | include/linux/iommu.h | 7 |
2 files changed, 22 insertions, 3 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index bc45478e26db..aeb243f46332 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -817,6 +817,15 @@ bool iommu_present(struct bus_type *bus) } EXPORT_SYMBOL_GPL(iommu_present); +bool iommu_capable(struct bus_type *bus, enum iommu_cap cap) +{ + if (!bus->iommu_ops || !bus->iommu_ops->capable) + return false; + + return bus->iommu_ops->capable(cap); +} +EXPORT_SYMBOL_GPL(iommu_capable); + /** * iommu_set_fault_handler() - set a fault handler for an iommu domain * @domain: iommu domain @@ -950,10 +959,13 @@ EXPORT_SYMBOL_GPL(iommu_iova_to_phys); int iommu_domain_has_cap(struct iommu_domain *domain, enum iommu_cap cap) { - if (unlikely(domain->ops->domain_has_cap == NULL)) - return 0; + if (domain->ops->domain_has_cap != NULL) + return domain->ops->domain_has_cap(domain, cap); + + if (domain->ops->capable != NULL) + return domain->ops->capable(cap); - return domain->ops->domain_has_cap(domain, cap); + return 0; } EXPORT_SYMBOL_GPL(iommu_domain_has_cap); diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 98fc126655ae..d5534d554693 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -105,6 +105,7 @@ enum iommu_attr { * @pgsize_bitmap: bitmap of supported page sizes */ struct iommu_ops { + bool (*capable)(enum iommu_cap); int (*domain_init)(struct iommu_domain *domain); void (*domain_destroy)(struct iommu_domain *domain); int (*attach_dev)(struct iommu_domain *domain, struct device *dev); @@ -145,6 +146,7 @@ struct iommu_ops { extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops); extern bool iommu_present(struct bus_type *bus); +extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap); extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus); extern struct iommu_group *iommu_group_get_by_id(int id); extern void iommu_domain_free(struct iommu_domain *domain); @@ -253,6 +255,11 @@ static inline bool iommu_present(struct bus_type *bus) return false; } +static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap) +{ + return false; +} + static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus) { return NULL; |
