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author | Joerg Roedel <joerg.roedel@amd.com> | 2011-08-26 16:48:26 +0200 |
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committer | Joerg Roedel <joerg.roedel@amd.com> | 2011-10-21 14:37:19 +0200 |
commit | ff21776d12ff7993a6b236b8273ef62777d25dfb (patch) | |
tree | e4775ee5c1f5f5e7e6975c0887766a3b886c1258 /drivers/iommu | |
parent | 39d4ebb95925046863dc0ef2698dfcf2c1f1dcbe (diff) | |
download | linux-ff21776d12ff7993a6b236b8273ef62777d25dfb.tar.gz linux-ff21776d12ff7993a6b236b8273ef62777d25dfb.tar.bz2 linux-ff21776d12ff7993a6b236b8273ef62777d25dfb.zip |
Driver core: Add iommu_ops to bus_type
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>
Diffstat (limited to 'drivers/iommu')
-rw-r--r-- | drivers/iommu/iommu.c | 31 |
1 files changed, 31 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; |