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authorAlex Williamson <alex.williamson@redhat.com>2011-10-21 23:56:05 +0400
committerJoerg Roedel <joerg.roedel@amd.com>2011-11-15 15:22:23 +0400
commit1460432cb513f0c16136ed132c20ecfbf8ccf942 (patch)
treef9802b729aa47d9c95fe2de5f41c511d3db7df4c /include/linux
parent1ea6b8f48918282bdca0b32a34095504ee65bab5 (diff)
downloadlinux-1460432cb513f0c16136ed132c20ecfbf8ccf942.tar.xz
iommu: Add iommu_device_group callback and iommu_group sysfs entry
An IOMMU group is a set of devices for which the IOMMU cannot distinguish transactions. For PCI devices, a group often occurs when a PCI bridge is involved. Transactions from any device behind the bridge appear to be sourced from the bridge itself. We leave it to the IOMMU driver to define the grouping restraints for their platform. Using this new interface, the group for a device can be retrieved using the iommu_device_group() callback. Users will compare the value returned against the value returned for other devices to determine whether they are part of the same group. Devices with no group are not translated by the IOMMU. There should be no expectations about the group numbers as they may be arbitrarily assigned by the IOMMU driver and may not be persistent across boots. We also provide a sysfs interface to the group numbers here so that userspace can understand IOMMU dependencies between devices for managing safe, userspace drivers. [Some code changes by Joerg Roedel <joerg.roedel@amd.com>] Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/iommu.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 432acc4c054d..93617e7779a1 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -61,6 +61,7 @@ struct iommu_ops {
unsigned long iova);
int (*domain_has_cap)(struct iommu_domain *domain,
unsigned long cap);
+ int (*device_group)(struct device *dev, unsigned int *groupid);
};
extern int bus_set_iommu(struct bus_type *bus, struct iommu_ops *ops);
@@ -81,6 +82,7 @@ extern int iommu_domain_has_cap(struct iommu_domain *domain,
unsigned long cap);
extern void iommu_set_fault_handler(struct iommu_domain *domain,
iommu_fault_handler_t handler);
+extern int iommu_device_group(struct device *dev, unsigned int *groupid);
/**
* report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
@@ -179,6 +181,11 @@ static inline void iommu_set_fault_handler(struct iommu_domain *domain,
{
}
+static inline int iommu_device_group(struct device *dev, unsigned int *groupid);
+{
+ return -ENODEV;
+}
+
#endif /* CONFIG_IOMMU_API */
#endif /* __LINUX_IOMMU_H */