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authorJoerg Roedel <joerg.roedel@amd.com>2011-08-26 16:48:26 +0200
committerJoerg Roedel <joerg.roedel@amd.com>2011-10-21 14:37:19 +0200
commitff21776d12ff7993a6b236b8273ef62777d25dfb (patch)
treee4775ee5c1f5f5e7e6975c0887766a3b886c1258 /drivers/iommu
parent39d4ebb95925046863dc0ef2698dfcf2c1f1dcbe (diff)
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.c31
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;