diff options
| -rw-r--r-- | drivers/pci/ats.c | 18 | ||||
| -rw-r--r-- | include/linux/pci-ats.h | 3 |
2 files changed, 20 insertions, 1 deletions
diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c index 390e92f2d8d1..b761c1f72f67 100644 --- a/drivers/pci/ats.c +++ b/drivers/pci/ats.c @@ -31,6 +31,22 @@ void pci_ats_init(struct pci_dev *dev) } /** + * pci_ats_supported - check if the device can use ATS + * @dev: the PCI device + * + * Returns true if the device supports ATS and is allowed to use it, false + * otherwise. + */ +bool pci_ats_supported(struct pci_dev *dev) +{ + if (!dev->ats_cap) + return false; + + return (dev->untrusted == 0); +} +EXPORT_SYMBOL_GPL(pci_ats_supported); + +/** * pci_enable_ats - enable the ATS capability * @dev: the PCI device * @ps: the IOMMU page shift @@ -42,7 +58,7 @@ int pci_enable_ats(struct pci_dev *dev, int ps) u16 ctrl; struct pci_dev *pdev; - if (!dev->ats_cap) + if (!pci_ats_supported(dev)) return -EINVAL; if (WARN_ON(dev->ats_enabled)) diff --git a/include/linux/pci-ats.h b/include/linux/pci-ats.h index d08f0869f121..f75c307f346d 100644 --- a/include/linux/pci-ats.h +++ b/include/linux/pci-ats.h @@ -6,11 +6,14 @@ #ifdef CONFIG_PCI_ATS /* Address Translation Service */ +bool pci_ats_supported(struct pci_dev *dev); int pci_enable_ats(struct pci_dev *dev, int ps); void pci_disable_ats(struct pci_dev *dev); int pci_ats_queue_depth(struct pci_dev *dev); int pci_ats_page_aligned(struct pci_dev *dev); #else /* CONFIG_PCI_ATS */ +static inline bool pci_ats_supported(struct pci_dev *d) +{ return false; } static inline int pci_enable_ats(struct pci_dev *d, int ps) { return -ENODEV; } static inline void pci_disable_ats(struct pci_dev *d) { } |