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iommu: Export bus_iommu_probe() and make is safe for re-probing

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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>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20200429133712.31431-14-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2020-04-29 15:36:51 +02:00
parent ce574c27ae
commit 5012c39685
2 changed files with 10 additions and 1 deletions
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10
drivers/iommu/iommu.c
View File

@ -1610,11 +1610,19 @@ static int probe_iommu_group(struct device *dev, void *data)
{
const struct iommu_ops *ops = dev->bus->iommu_ops;
struct list_head *group_list = data;
struct iommu_group *group;
int ret;
if (!dev_iommu_get(dev))
return -ENOMEM;
/* Device is probed already if in a group */
group = iommu_group_get(dev);
if (group) {
iommu_group_put(group);
return 0;
}
if (!try_module_get(ops->owner)) {
ret = -EINVAL;
goto err_free_dev_iommu;
@ -1783,7 +1791,7 @@ 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;

1
include/linux/iommu.h
View File

@ -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);