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iommu/core: Add fault reporting mechanism

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Add iommu fault report mechanism to the IOMMU API, so implementations
could report about mmu faults (translation errors, hardware errors,
etc..).

Fault reports can be used in several ways:
- mere logging
- reset the device that accessed the faulting address (may be necessary
  in case the device is a remote processor for example)
- implement dynamic PTE/TLB loading

A dedicated iommu_set_fault_handler() API has been added to allow
users, who are interested to receive such reports, to provide
their handler.

Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Ohad Ben-Cohen 2011-09-13 15:25:23 -04:00 committed by Joerg Roedel
parent 5e1b612cb1
commit 4f3f8d9db3
2 changed files with 64 additions and 0 deletions
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13
drivers/iommu/iommu.c
View File

@ -39,6 +39,19 @@ bool iommu_found(void)
}
EXPORT_SYMBOL_GPL(iommu_found);
/**
* iommu_set_fault_handler() - set a fault handler for an iommu domain
* @domain: iommu domain
* @handler: fault handler
*/
void iommu_set_fault_handler(struct iommu_domain *domain,
iommu_fault_handler_t handler)
{
BUG_ON(!domain);
domain->handler = handler;
}
struct iommu_domain *iommu_domain_alloc(void)
{
struct iommu_domain *domain;

51
include/linux/iommu.h
View File

@ -26,9 +26,18 @@
#define IOMMU_CACHE (4) /* DMA cache coherency */
struct device;
struct iommu_domain;
/* iommu fault flags */
#define IOMMU_FAULT_READ 0x0
#define IOMMU_FAULT_WRITE 0x1
typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
struct device *, unsigned long, int);
struct iommu_domain {
void *priv;
iommu_fault_handler_t handler;
};
#define IOMMU_CAP_CACHE_COHERENCY 0x1
@ -67,6 +76,43 @@ 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);
extern void iommu_set_fault_handler(struct iommu_domain *domain,
iommu_fault_handler_t handler);
/**
* report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
* @domain: the iommu domain where the fault has happened
* @dev: the device where the fault has happened
* @iova: the faulting address
* @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...)
*
* This function should be called by the low-level IOMMU implementations
* whenever IOMMU faults happen, to allow high-level users, that are
* interested in such events, to know about them.
*
* This event may be useful for several possible use cases:
* - mere logging of the event
* - dynamic TLB/PTE loading
* - if restarting of the faulting device is required
*
* Returns 0 on success and an appropriate error code otherwise (if dynamic
* PTE/TLB loading will one day be supported, implementations will be able
* to tell whether it succeeded or not according to this return value).
*/
static inline int report_iommu_fault(struct iommu_domain *domain,
struct device *dev, unsigned long iova, int flags)
{
int ret = 0;
/*
* if upper layers showed interest and installed a fault handler,
* invoke it.
*/
if (domain->handler)
ret = domain->handler(domain, dev, iova, flags);
return ret;
}
#else /* CONFIG_IOMMU_API */
@ -123,6 +169,11 @@ static inline int domain_has_cap(struct iommu_domain *domain,
return 0;
}
static inline void iommu_set_fault_handler(struct iommu_domain *domain,
iommu_fault_handler_t handler)
{
}
#endif /* CONFIG_IOMMU_API */
#endif /* __LINUX_IOMMU_H */