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Subject[RFC PATCH 13/34] iommu: Export bus_iommu_probe() and make is safe for re-probing
Date
From: Joerg Roedel <jroedel@suse.de>

Add a check to the bus_iommu_probe() call-path to make sure it ignores
devices which have already been successfully probed. Then export the
bus_iommu_probe() function so it can be used by IOMMU drivers.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
drivers/iommu/iommu.c | 6 +++++-
include/linux/iommu.h | 1 +
2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 844613850595..cf25c1e48830 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1615,6 +1615,10 @@ static int probe_iommu_group(struct device *dev, void *data)
if (!dev_iommu_get(dev))
return -ENOMEM;

+ /* Device is probed already if in a group */
+ if (iommu_group_get(dev) != NULL)
+ return 0;
+
if (!try_module_get(ops->owner)) {
ret = -EINVAL;
goto err_free_dev_iommu;
@@ -1783,7 +1787,7 @@ static int iommu_group_create_direct_mappings(struct iommu_group *group)
iommu_do_create_direct_mappings);
}

-static int bus_iommu_probe(struct bus_type *bus)
+int bus_iommu_probe(struct bus_type *bus)
{
const struct iommu_ops *ops = bus->iommu_ops;
int ret;
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 30170d191e5e..fea1622408ad 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -445,6 +445,7 @@ static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
#define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER 6 /* Post Driver unbind */

extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
+extern int bus_iommu_probe(struct bus_type *bus);
extern bool iommu_present(struct bus_type *bus);
extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
--
2.17.1
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