diff options
| -rw-r--r-- | drivers/iommu/iommu.c | 25 |
1 files changed, 22 insertions, 3 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 8e4436c606d3..88aeae0acd9b 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -2143,12 +2143,31 @@ __iommu_group_domain_alloc(struct iommu_group *group, unsigned int type) return __iommu_domain_alloc(dev_iommu_ops(dev), dev, type); } +static int __iommu_domain_alloc_dev(struct device *dev, void *data) +{ + const struct iommu_ops **ops = data; + + if (!dev_has_iommu(dev)) + return 0; + + if (WARN_ONCE(*ops && *ops != dev_iommu_ops(dev), + "Multiple IOMMU drivers present for bus %s, which the public IOMMU API can't fully support yet. You will still need to disable one or more for this to work, sorry!\n", + dev_bus_name(dev))) + return -EBUSY; + + *ops = dev_iommu_ops(dev); + return 0; +} + struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus) { - if (bus == NULL || bus->iommu_ops == NULL) + const struct iommu_ops *ops = NULL; + int err = bus_for_each_dev(bus, NULL, &ops, __iommu_domain_alloc_dev); + + if (err || !ops) return NULL; - return __iommu_domain_alloc(bus->iommu_ops, NULL, - IOMMU_DOMAIN_UNMANAGED); + + return __iommu_domain_alloc(ops, NULL, IOMMU_DOMAIN_UNMANAGED); } EXPORT_SYMBOL_GPL(iommu_domain_alloc); |