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authorOhad Ben-Cohen <ohad@wizery.com>2011-09-27 07:36:40 -0400
committerJoerg Roedel <joerg.roedel@amd.com>2011-09-30 16:40:32 +0200
commit0ed6d2d27bcc2ace454a8c55446e1bc3efd2d529 (patch)
tree0ed0c8f9878ee5a921ab69131e38a45864e2498f /include/linux/iommu.h
parent30bd918c7132adddd370c79fd5619bf108efd702 (diff)
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: Ohad Ben-Cohen <ohad@wizery.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'include/linux/iommu.h')
-rw-r--r--include/linux/iommu.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index d084e8777e0e..ddad0ae0a433 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -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,