diff options
| -rw-r--r-- | include/linux/iommu.h | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 614363f84b38..1cc549a75853 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -39,8 +39,11 @@ struct iommu_domain; struct notifier_block; /* iommu fault flags */ -#define IOMMU_FAULT_READ 0x0 -#define IOMMU_FAULT_WRITE 0x1 +#define IOMMU_FAULT_READ (1 << 0) +#define IOMMU_FAULT_WRITE (1 << 1) +#define IOMMU_FAULT_TRANSLATION (1 << 2) +#define IOMMU_FAULT_PERMISSION (1 << 3) +#define IOMMU_FAULT_TRANSACTION_STALLED (1 << 4) typedef int (*iommu_fault_handler_t)(struct iommu_domain *, struct device *, unsigned long, int, void *); @@ -240,6 +243,11 @@ extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr) * Specifically, -ENOSYS is returned if a fault handler isn't installed * (though fault handlers can also return -ENOSYS, in case they want to * elicit the default behavior of the IOMMU drivers). + + * Client fault handler returns -EBUSY to signal to the IOMMU driver + * that the client will take responsibility for any further fault + * handling, including clearing fault status registers or retrying + * the faulting transaction. */ static inline int report_iommu_fault(struct iommu_domain *domain, struct device *dev, unsigned long iova, int flags) |