From 086ac11f6435c9dc2fe5025fc8ea3a1dbca273d6 Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Tue, 27 Sep 2011 15:57:16 +0200 Subject: PCI: Add support for PASID capability Devices supporting Process Address Space Identifiers (PASIDs) can use an IOMMU to access multiple IO address spaces at the same time. A PCIe device indicates support for this feature by implementing the PASID capability. This patch adds support for the capability to the Linux kernel. Reviewed-by: Bjorn Helgaas Signed-off-by: Joerg Roedel Signed-off-by: Jesse Barnes --- include/linux/pci-ats.h | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) (limited to 'include/linux/pci-ats.h') diff --git a/include/linux/pci-ats.h b/include/linux/pci-ats.h index 071395251abf..e3d0b3890249 100644 --- a/include/linux/pci-ats.h +++ b/include/linux/pci-ats.h @@ -93,4 +93,35 @@ static inline int pci_pri_status(struct pci_dev *pdev) } #endif /* CONFIG_PCI_PRI */ +#ifdef CONFIG_PCI_PASID + +extern int pci_enable_pasid(struct pci_dev *pdev, int features); +extern void pci_disable_pasid(struct pci_dev *pdev); +extern int pci_pasid_features(struct pci_dev *pdev); +extern int pci_max_pasids(struct pci_dev *pdev); + +#else /* CONFIG_PCI_PASID */ + +static inline int pci_enable_pasid(struct pci_dev *pdev, int features) +{ + return -EINVAL; +} + +static inline void pci_disable_pasid(struct pci_dev *pdev) +{ +} + +static inline int pci_pasid_features(struct pci_dev *pdev) +{ + return -EINVAL; +} + +static inline int pci_max_pasids(struct pci_dev *pdev) +{ + return -EINVAL; +} + +#endif /* CONFIG_PCI_PASID */ + + #endif /* LINUX_PCI_ATS_H*/ -- cgit v1.2.3-59-g8ed1b