Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 7d31089e authored by Mitchel Humpherys's avatar Mitchel Humpherys
Browse files

iommu: Add iommu_trigger_fault 



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: default avatarMitchel Humpherys <mitchelh@codeaurora.org>
parent 455b690f

drivers/iommu/iommu.c

+15 −0
Original line number Diff line number Diff line
@@ -917,6 +917,21 @@ void iommu_set_fault_handler(struct iommu_domain *domain, 
}

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 *domain;

include/linux/iommu.h

+7 −0
Original line number Diff line number Diff line
@@ -116,6 +116,7 @@ enum iommu_attr { 
 * @domain_get_attr: Query domain attributes

 * @domain_set_attr: Change domain attributes

 * @pgsize_bitmap: bitmap of supported page sizes

 * @trigger_fault: trigger a fault on the device attached to an iommu domain

 */

struct iommu_ops {

	bool (*capable)(enum iommu_cap);
@@ -155,6 +156,7 @@ struct iommu_ops { 
	u32 (*domain_get_windows)(struct iommu_domain *domain);

	int (*dma_supported)(struct iommu_domain *domain, struct device *dev,

			     u64 mask);

	void (*trigger_fault)(struct iommu_domain *domain);



	unsigned long pgsize_bitmap;

};
@@ -194,6 +196,7 @@ extern phys_addr_t iommu_iova_to_phys_hard(struct iommu_domain *domain, 
					   dma_addr_t iova);

extern void iommu_set_fault_handler(struct iommu_domain *domain,

			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,

			      struct iommu_group *group);
@@ -397,6 +400,10 @@ 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,

				     struct iommu_group *group)

{