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Driver core: Add iommu_ops to bus_type

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This is the starting point to make the iommu_ops used for
the iommu-api a per-bus-type structure. It is required to
easily implement bus-specific setup in the iommu-layer.
The first user will be the iommu-group attribute in sysfs.

Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2011-08-26 16:48:26 +02:00
parent 39d4ebb959
commit ff21776d12
3 changed files with 39 additions and 0 deletions
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31
drivers/iommu/iommu.c
View File

@ -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;

6
include/linux/device.h
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@ -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;
};

2
include/linux/iommu.h
View File

@ -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);