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iommu: Add iommu_trigger_fault

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It can be useful to trigger an IOMMU fault during development and
debugging.  Add support to the IOMMU framework to do so.

Change-Id: I908c9f5b52c6abe937f031de546d290027ba64b5
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
This commit is contained in:
Mitchel Humpherys 2015-07-09 16:59:02 -07:00 • committed by David Keitel
parent 4b8b66bb58
commit 1f9b32916b
2 changed files with 22 additions and 0 deletions
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15
drivers/iommu/iommu.c
View file

@ -886,6 +886,21 @@ void iommu_set_fault_handler(struct iommu_domain *domain,
} }
EXPORT_SYMBOL_GPL(iommu_set_fault_handler); EXPORT_SYMBOL_GPL(iommu_set_fault_handler);
/**
* iommu_trigger_fault() - trigger an IOMMU fault
* @domain: iommu domain
*
* Triggers a fault on the device to which this domain is attached.
*
* This function should only be used for debugging purposes, for obvious
* reasons.
*/
void iommu_trigger_fault(struct iommu_domain *domain)
{
if (domain->ops->trigger_fault)
domain->ops->trigger_fault(domain);
}
struct iommu_domain *iommu_domain_alloc(struct bus_type *bus) struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
{ {
struct iommu_domain *domain; struct iommu_domain *domain;

7
include/linux/iommu.h
View file

@ -116,6 +116,7 @@ enum iommu_attr {
* @domain_get_attr: Query domain attributes * @domain_get_attr: Query domain attributes
* @domain_set_attr: Change domain attributes * @domain_set_attr: Change domain attributes
* @pgsize_bitmap: bitmap of supported page sizes * @pgsize_bitmap: bitmap of supported page sizes
* @trigger_fault: trigger a fault on the device attached to an iommu domain
*/ */
struct iommu_ops { struct iommu_ops {
bool (*capable)(enum iommu_cap); bool (*capable)(enum iommu_cap);
@ -150,6 +151,7 @@ struct iommu_ops {
u32 (*domain_get_windows)(struct iommu_domain *domain); u32 (*domain_get_windows)(struct iommu_domain *domain);
int (*dma_supported)(struct iommu_domain *domain, struct device *dev, int (*dma_supported)(struct iommu_domain *domain, struct device *dev,
u64 mask); u64 mask);
void (*trigger_fault)(struct iommu_domain *domain);
unsigned long pgsize_bitmap; unsigned long pgsize_bitmap;
}; };
@ -185,6 +187,7 @@ extern phys_addr_t iommu_iova_to_phys_hard(struct iommu_domain *domain,
dma_addr_t iova); dma_addr_t iova);
extern void iommu_set_fault_handler(struct iommu_domain *domain, extern void iommu_set_fault_handler(struct iommu_domain *domain,
iommu_fault_handler_t handler, void *token); iommu_fault_handler_t handler, void *token);
extern void iommu_trigger_fault(struct iommu_domain *domain);
extern int iommu_attach_group(struct iommu_domain *domain, extern int iommu_attach_group(struct iommu_domain *domain,
struct iommu_group *group); struct iommu_group *group);
@ -374,6 +377,10 @@ static inline void iommu_set_fault_handler(struct iommu_domain *domain,
{ {
} }
static inline void iommu_trigger_fault(struct iommu_domain *domain)
{
}
static inline int iommu_attach_group(struct iommu_domain *domain, static inline int iommu_attach_group(struct iommu_domain *domain,
struct iommu_group *group) struct iommu_group *group)
{ {