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Commit 0ed6d2d2 authored by Ohad Ben-Cohen's avatar Ohad Ben-Cohen Committed by Joerg Roedel
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iommu/core: let drivers know if an iommu fault handler isn't installed 



Make report_iommu_fault() return -ENOSYS whenever an iommu fault
handler isn't installed, so IOMMU drivers can then do their own
platform-specific default behavior if they wanted.

Fault handlers can still return -ENOSYS in case they want to elicit the
default behavior of the IOMMU drivers.

Signed-off-by: default avatarOhad Ben-Cohen <ohad@wizery.com>
Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent 30bd918c

drivers/iommu/iommu.c

+6 −0
Original line number Diff line number Diff line
@@ -43,6 +43,12 @@ EXPORT_SYMBOL_GPL(iommu_found); 
 * iommu_set_fault_handler() - set a fault handler for an iommu domain

 * @domain: iommu domain

 * @handler: fault handler

 *

 * This function should be used by IOMMU users which want to be notified

 * whenever an IOMMU fault happens.

 *

 * The fault handler itself should return 0 on success, and an appropriate

 * error code otherwise.

 */

void iommu_set_fault_handler(struct iommu_domain *domain,

					iommu_fault_handler_t handler)

include/linux/iommu.h

+5 −1
Original line number Diff line number Diff line
@@ -98,11 +98,15 @@ extern void iommu_set_fault_handler(struct iommu_domain *domain, 
 * 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).

 *

 * 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).

 */

static inline int report_iommu_fault(struct iommu_domain *domain,

		struct device *dev, unsigned long iova, int flags)

{

	int ret = 0;

	int ret = -ENOSYS;



	/*

	 * if upper layers showed interest and installed a fault handler,