diff options
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/iommu.c | 28 |
1 files changed, 25 insertions, 3 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 3b67144dead2..770ba7e7ef4d 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -36,6 +36,7 @@ static struct kset *iommu_group_kset; static DEFINE_IDA(iommu_group_ida); +static unsigned int iommu_def_domain_type = IOMMU_DOMAIN_DMA; struct iommu_callback_data { const struct iommu_ops *ops; @@ -112,6 +113,18 @@ static int __iommu_attach_group(struct iommu_domain *domain, static void __iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group); +static int __init iommu_set_def_domain_type(char *str) +{ + bool pt; + + if (!str || strtobool(str, &pt)) + return -EINVAL; + + iommu_def_domain_type = pt ? IOMMU_DOMAIN_IDENTITY : IOMMU_DOMAIN_DMA; + return 0; +} +early_param("iommu.passthrough", iommu_set_def_domain_type); + static ssize_t iommu_group_attr_show(struct kobject *kobj, struct attribute *__attr, char *buf) { @@ -1015,10 +1028,19 @@ struct iommu_group *iommu_group_get_for_dev(struct device *dev) * IOMMU driver. */ if (!group->default_domain) { - group->default_domain = __iommu_domain_alloc(dev->bus, - IOMMU_DOMAIN_DMA); + struct iommu_domain *dom; + + dom = __iommu_domain_alloc(dev->bus, iommu_def_domain_type); + if (!dom && iommu_def_domain_type != IOMMU_DOMAIN_DMA) { + dev_warn(dev, + "failed to allocate default IOMMU domain of type %u; falling back to IOMMU_DOMAIN_DMA", + iommu_def_domain_type); + dom = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_DMA); + } + + group->default_domain = dom; if (!group->domain) - group->domain = group->default_domain; + group->domain = dom; } ret = iommu_group_add_device(group, dev); |