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PCI: Add support for PASID capability

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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 <bhelgaas@google.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Joerg Roedel 2011-09-27 15:57:16 +02:00 • committed by Jesse Barnes
parent c320b976d7
commit 086ac11f64
4 changed files with 165 additions and 0 deletions
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31
include/linux/pci-ats.h
View file

@ -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*/