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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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c320b976d7
Implement the necessary functions to handle PRI capabilities on PCIe devices. With PRI devices behind an IOMMU can signal page fault conditions to software and recover from such faults. Reviewed-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
97 lines
2.0 KiB
C
97 lines
2.0 KiB
C
#ifndef LINUX_PCI_ATS_H
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#define LINUX_PCI_ATS_H
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#include <linux/pci.h>
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/* Address Translation Service */
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struct pci_ats {
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int pos; /* capability position */
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int stu; /* Smallest Translation Unit */
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int qdep; /* Invalidate Queue Depth */
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int ref_cnt; /* Physical Function reference count */
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unsigned int is_enabled:1; /* Enable bit is set */
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};
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#ifdef CONFIG_PCI_IOV
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extern int pci_enable_ats(struct pci_dev *dev, int ps);
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extern void pci_disable_ats(struct pci_dev *dev);
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extern int pci_ats_queue_depth(struct pci_dev *dev);
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/**
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* pci_ats_enabled - query the ATS status
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* @dev: the PCI device
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*
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* Returns 1 if ATS capability is enabled, or 0 if not.
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*/
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static inline int pci_ats_enabled(struct pci_dev *dev)
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{
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return dev->ats && dev->ats->is_enabled;
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}
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#else /* CONFIG_PCI_IOV */
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static inline int pci_enable_ats(struct pci_dev *dev, int ps)
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{
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return -ENODEV;
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}
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static inline void pci_disable_ats(struct pci_dev *dev)
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{
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}
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static inline int pci_ats_queue_depth(struct pci_dev *dev)
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{
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return -ENODEV;
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}
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static inline int pci_ats_enabled(struct pci_dev *dev)
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{
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return 0;
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}
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#endif /* CONFIG_PCI_IOV */
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#ifdef CONFIG_PCI_PRI
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extern int pci_enable_pri(struct pci_dev *pdev, u32 reqs);
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extern void pci_disable_pri(struct pci_dev *pdev);
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extern bool pci_pri_enabled(struct pci_dev *pdev);
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extern int pci_reset_pri(struct pci_dev *pdev);
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extern bool pci_pri_stopped(struct pci_dev *pdev);
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extern int pci_pri_status(struct pci_dev *pdev);
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#else /* CONFIG_PCI_PRI */
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static inline int pci_enable_pri(struct pci_dev *pdev, u32 reqs)
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{
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return -ENODEV;
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}
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static inline void pci_disable_pri(struct pci_dev *pdev)
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{
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}
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static inline bool pci_pri_enabled(struct pci_dev *pdev)
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{
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return false;
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}
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static inline int pci_reset_pri(struct pci_dev *pdev)
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{
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return -ENODEV;
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}
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static inline bool pci_pri_stopped(struct pci_dev *pdev)
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{
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return true;
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}
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static inline int pci_pri_status(struct pci_dev *pdev)
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{
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return -ENODEV;
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}
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#endif /* CONFIG_PCI_PRI */
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#endif /* LINUX_PCI_ATS_H*/
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