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authorAlex Williamson <alex.williamson@redhat.com>2012-05-31 00:18:53 +0400
committerJoerg Roedel <joerg.roedel@amd.com>2012-06-25 15:48:15 +0400
commitd72e31c9374627068df29da8085ca18c92ae35d3 (patch)
treeed8bb77e31c0dd2c2b9c84d31ef6860c6ff03e51 /include/linux/iommu.h
parent74416e1e07660798379ce10a210bf4fd35b84f9f (diff)
downloadlinux-d72e31c9374627068df29da8085ca18c92ae35d3.tar.xz
iommu: IOMMU Groups
IOMMU device groups are currently a rather vague associative notion with assembly required by the user or user level driver provider to do anything useful. This patch intends to grow the IOMMU group concept into something a bit more consumable. To do this, we first create an object representing the group, struct iommu_group. This structure is allocated (iommu_group_alloc) and filled (iommu_group_add_device) by the iommu driver. The iommu driver is free to add devices to the group using it's own set of policies. This allows inclusion of devices based on physical hardware or topology limitations of the platform, as well as soft requirements, such as multi-function trust levels or peer-to-peer protection of the interconnects. Each device may only belong to a single iommu group, which is linked from struct device.iommu_group. IOMMU groups are maintained using kobject reference counting, allowing for automatic removal of empty, unreferenced groups. It is the responsibility of the iommu driver to remove devices from the group (iommu_group_remove_device). IOMMU groups also include a userspace representation in sysfs under /sys/kernel/iommu_groups. When allocated, each group is given a dynamically assign ID (int). The ID is managed by the core IOMMU group code to support multiple heterogeneous iommu drivers, which could potentially collide in group naming/numbering. This also keeps group IDs to small, easily managed values. A directory is created under /sys/kernel/iommu_groups for each group. A further subdirectory named "devices" contains links to each device within the group. The iommu_group file in the device's sysfs directory, which formerly contained a group number when read, is now a link to the iommu group. Example: $ ls -l /sys/kernel/iommu_groups/26/devices/ total 0 lrwxrwxrwx. 1 root root 0 Apr 17 12:57 0000:00:1e.0 -> ../../../../devices/pci0000:00/0000:00:1e.0 lrwxrwxrwx. 1 root root 0 Apr 17 12:57 0000:06:0d.0 -> ../../../../devices/pci0000:00/0000:00:1e.0/0000:06:0d.0 lrwxrwxrwx. 1 root root 0 Apr 17 12:57 0000:06:0d.1 -> ../../../../devices/pci0000:00/0000:00:1e.0/0000:06:0d.1 $ ls -l /sys/kernel/iommu_groups/26/devices/*/iommu_group [truncating perms/owner/timestamp] /sys/kernel/iommu_groups/26/devices/0000:00:1e.0/iommu_group -> ../../../kernel/iommu_groups/26 /sys/kernel/iommu_groups/26/devices/0000:06:0d.0/iommu_group -> ../../../../kernel/iommu_groups/26 /sys/kernel/iommu_groups/26/devices/0000:06:0d.1/iommu_group -> ../../../../kernel/iommu_groups/26 Groups also include several exported functions for use by user level driver providers, for example VFIO. These include: iommu_group_get(): Acquires a reference to a group from a device iommu_group_put(): Releases reference iommu_group_for_each_dev(): Iterates over group devices using callback iommu_group_[un]register_notifier(): Allows notification of device add and remove operations relevant to the group iommu_group_id(): Return the group number This patch also extends the IOMMU API to allow attaching groups to domains. This is currently a simple wrapper for iterating through devices within a group, but it's expected that the IOMMU API may eventually make groups a more integral part of domains. Groups intentionally do not try to manage group ownership. A user level driver provider must independently acquire ownership for each device within a group before making use of the group as a whole. This may change in the future if group usage becomes more pervasive across both DMA and IOMMU ops. Groups intentionally do not provide a mechanism for driver locking or otherwise manipulating driver matching/probing of devices within the group. Such interfaces are generic to devices and beyond the scope of IOMMU groups. If implemented, user level providers have ready access via iommu_group_for_each_dev and group notifiers. iommu_device_group() is removed here as it has no users. The replacement is: group = iommu_group_get(dev); id = iommu_group_id(group); iommu_group_put(group); AMD-Vi & Intel VT-d support re-added in following patches. Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'include/linux/iommu.h')
-rw-r--r--include/linux/iommu.h104
1 files changed, 101 insertions, 3 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 450293f6d68b..a71df92be992 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -26,6 +26,7 @@
#define IOMMU_CACHE (4) /* DMA cache coherency */
struct iommu_ops;
+struct iommu_group;
struct bus_type;
struct device;
struct iommu_domain;
@@ -60,6 +61,8 @@ struct iommu_domain {
* @iova_to_phys: translate iova to physical address
* @domain_has_cap: domain capabilities query
* @commit: commit iommu domain
+ * @add_device: add device to iommu grouping
+ * @remove_device: remove device from iommu grouping
* @pgsize_bitmap: bitmap of supported page sizes
*/
struct iommu_ops {
@@ -75,10 +78,18 @@ 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);
+ int (*add_device)(struct device *dev);
+ void (*remove_device)(struct device *dev);
unsigned long pgsize_bitmap;
};
+#define IOMMU_GROUP_NOTIFY_ADD_DEVICE 1 /* Device added */
+#define IOMMU_GROUP_NOTIFY_DEL_DEVICE 2 /* Pre Device removed */
+#define IOMMU_GROUP_NOTIFY_BIND_DRIVER 3 /* Pre Driver bind */
+#define IOMMU_GROUP_NOTIFY_BOUND_DRIVER 4 /* Post Driver bind */
+#define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER 5 /* Pre Driver unbind */
+#define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER 6 /* Post Driver unbind */
+
extern int bus_set_iommu(struct bus_type *bus, struct iommu_ops *ops);
extern bool iommu_present(struct bus_type *bus);
extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
@@ -97,7 +108,29 @@ 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, void *token);
-extern int iommu_device_group(struct device *dev, unsigned int *groupid);
+
+extern int iommu_attach_group(struct iommu_domain *domain,
+ struct iommu_group *group);
+extern void iommu_detach_group(struct iommu_domain *domain,
+ struct iommu_group *group);
+extern struct iommu_group *iommu_group_alloc(void);
+extern void *iommu_group_get_iommudata(struct iommu_group *group);
+extern void iommu_group_set_iommudata(struct iommu_group *group,
+ void *iommu_data,
+ void (*release)(void *iommu_data));
+extern int iommu_group_set_name(struct iommu_group *group, const char *name);
+extern int iommu_group_add_device(struct iommu_group *group,
+ struct device *dev);
+extern void iommu_group_remove_device(struct device *dev);
+extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
+ int (*fn)(struct device *, void *));
+extern struct iommu_group *iommu_group_get(struct device *dev);
+extern void iommu_group_put(struct iommu_group *group);
+extern int iommu_group_register_notifier(struct iommu_group *group,
+ struct notifier_block *nb);
+extern int iommu_group_unregister_notifier(struct iommu_group *group,
+ struct notifier_block *nb);
+extern int iommu_group_id(struct iommu_group *group);
/**
* report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
@@ -142,6 +175,7 @@ static inline int report_iommu_fault(struct iommu_domain *domain,
#else /* CONFIG_IOMMU_API */
struct iommu_ops {};
+struct iommu_group {};
static inline bool iommu_present(struct bus_type *bus)
{
@@ -197,11 +231,75 @@ static inline void iommu_set_fault_handler(struct iommu_domain *domain,
{
}
-static inline int iommu_device_group(struct device *dev, unsigned int *groupid)
+int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group)
+{
+ return -ENODEV;
+}
+
+void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group)
+{
+}
+
+struct iommu_group *iommu_group_alloc(void)
+{
+ return ERR_PTR(-ENODEV);
+}
+
+void *iommu_group_get_iommudata(struct iommu_group *group)
+{
+ return NULL;
+}
+
+void iommu_group_set_iommudata(struct iommu_group *group, void *iommu_data,
+ void (*release)(void *iommu_data))
+{
+}
+
+int iommu_group_set_name(struct iommu_group *group, const char *name)
+{
+ return -ENODEV;
+}
+
+int iommu_group_add_device(struct iommu_group *group, struct device *dev)
+{
+ return -ENODEV;
+}
+
+void iommu_group_remove_device(struct device *dev)
+{
+}
+
+int iommu_group_for_each_dev(struct iommu_group *group, void *data,
+ int (*fn)(struct device *, void *))
+{
+ return -ENODEV;
+}
+
+struct iommu_group *iommu_group_get(struct device *dev)
+{
+ return NULL;
+}
+
+void iommu_group_put(struct iommu_group *group)
+{
+}
+
+int iommu_group_register_notifier(struct iommu_group *group,
+ struct notifier_block *nb)
{
return -ENODEV;
}
+int iommu_group_unregister_notifier(struct iommu_group *group,
+ struct notifier_block *nb)
+{
+ return 0;
+}
+
+int iommu_group_id(struct iommu_group *group)
+{
+ return -ENODEV;
+}
#endif /* CONFIG_IOMMU_API */
#endif /* __LINUX_IOMMU_H */