diff options
Diffstat (limited to 'drivers/iommu/iommu.c')
| -rw-r--r-- | drivers/iommu/iommu.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index f2c45b85b9fc..780c11734979 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -1906,6 +1906,29 @@ bool iommu_present(struct bus_type *bus) } EXPORT_SYMBOL_GPL(iommu_present); +/** + * device_iommu_capable() - check for a general IOMMU capability + * @dev: device to which the capability would be relevant, if available + * @cap: IOMMU capability + * + * Return: true if an IOMMU is present and supports the given capability + * for the given device, otherwise false. + */ +bool device_iommu_capable(struct device *dev, enum iommu_cap cap) +{ + const struct iommu_ops *ops; + + if (!dev->iommu || !dev->iommu->iommu_dev) + return false; + + ops = dev_iommu_ops(dev); + if (!ops->capable) + return false; + + return ops->capable(cap); +} +EXPORT_SYMBOL_GPL(device_iommu_capable); + bool iommu_capable(struct bus_type *bus, enum iommu_cap cap) { if (!bus->iommu_ops || !bus->iommu_ops->capable) |