[PATCH v3 4/9] iommu: Add driver-not-bound notification

Alex Williamson
2017-06-20T15:48:06Z

The driver core supports a BUS_NOTIFY_DRIVER_NOT_BOUND notification
sent if a driver fails to bind to a device. Extend IOMMU group
notifications to include a version of this.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Joerg Roedel <jroedel@suse.de>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
---
drivers/iommu/iommu.c | 3 +++
include/linux/iommu.h | 1 +
2 files changed, 4 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index cf7ca7e70777..1a59b3626ab2 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1139,6 +1139,9 @@ static int iommu_bus_notifier(struct notifier_block *nb,
case BUS_NOTIFY_UNBOUND_DRIVER:
group_action = IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER;
break;
+ case BUS_NOTIFY_DRIVER_NOT_BOUND:
+ group_action = IOMMU_GROUP_NOTIFY_DRIVER_NOT_BOUND;
+ break;
}

if (group_action)
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 2cb54adc4a33..5f6b01398bc1 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -271,6 +271,7 @@ static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
#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 */
+#define IOMMU_GROUP_NOTIFY_DRIVER_NOT_BOUND 7 /* Driver bind failed */

extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
extern bool iommu_present(struct bus_type *bus);