diff options
| -rw-r--r-- | drivers/iommu/iommu.c | 31 | ||||
| -rw-r--r-- | include/linux/device.h | 6 | ||||
| -rw-r--r-- | include/linux/iommu.h | 2 |
3 files changed, 39 insertions, 0 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 30b064497486..3343264f5105 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -34,6 +34,37 @@ void register_iommu(struct iommu_ops *ops) iommu_ops = ops; } +static void iommu_bus_init(struct bus_type *bus, struct iommu_ops *ops) +{ +} + +/** + * bus_set_iommu - set iommu-callbacks for the bus + * @bus: bus. + * @ops: the callbacks provided by the iommu-driver + * + * This function is called by an iommu driver to set the iommu methods + * used for a particular bus. Drivers for devices on that bus can use + * the iommu-api after these ops are registered. + * This special function is needed because IOMMUs are usually devices on + * the bus itself, so the iommu drivers are not initialized when the bus + * is set up. With this function the iommu-driver can set the iommu-ops + * afterwards. + */ +int bus_set_iommu(struct bus_type *bus, struct iommu_ops *ops) +{ + if (bus->iommu_ops != NULL) + return -EBUSY; + + bus->iommu_ops = ops; + + /* Do IOMMU specific setup for this bus-type */ + iommu_bus_init(bus, ops); + + return 0; +} +EXPORT_SYMBOL_GPL(bus_set_iommu); + bool iommu_found(void) { return iommu_ops != NULL; diff --git a/include/linux/device.h b/include/linux/device.h index c20dfbfc49b4..e838e143baa7 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -33,6 +33,7 @@ struct class; struct subsys_private; struct bus_type; struct device_node; +struct iommu_ops; struct bus_attribute { struct attribute attr; @@ -67,6 +68,9 @@ extern void bus_remove_file(struct bus_type *, struct bus_attribute *); * @resume: Called to bring a device on this bus out of sleep mode. * @pm: Power management operations of this bus, callback the specific * device driver's pm-ops. + * @iommu_ops IOMMU specific operations for this bus, used to attach IOMMU + * driver implementations to a bus and allow the driver to do + * bus-specific setup * @p: The private data of the driver core, only the driver core can * touch this. * @@ -96,6 +100,8 @@ struct bus_type { const struct dev_pm_ops *pm; + struct iommu_ops *iommu_ops; + struct subsys_private *p; }; diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 6470cd87b4ea..dca83d3405b1 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -25,6 +25,7 @@ #define IOMMU_WRITE (2) #define IOMMU_CACHE (4) /* DMA cache coherency */ +struct bus_type; struct device; struct iommu_domain { @@ -52,6 +53,7 @@ struct iommu_ops { }; extern void register_iommu(struct iommu_ops *ops); +extern int bus_set_iommu(struct bus_type *bus, struct iommu_ops *ops); extern bool iommu_found(void); extern struct iommu_domain *iommu_domain_alloc(void); extern void iommu_domain_free(struct iommu_domain *domain); |