include/linux/pci-ats.h

   1 #ifndef LINUX_PCI_ATS_H
   2 #define LINUX_PCI_ATS_H
   3
   4 /* Address Translation Service */
   5 struct pci_ats {
   6         int pos;        /* capability position */
   7         int stu;        /* Smallest Translation Unit */
   8         int qdep;       /* Invalidate Queue Depth */
   9         int ref_cnt;    /* Physical Function reference count */
  10         unsigned int is_enabled:1;      /* Enable bit is set */
  11 };
  12
  13 #ifdef CONFIG_PCI_IOV
  14
  15 extern int pci_enable_ats(struct pci_dev *dev, int ps);
  16 extern void pci_disable_ats(struct pci_dev *dev);
  17 extern int pci_ats_queue_depth(struct pci_dev *dev);
  18 /**
  19  * pci_ats_enabled - query the ATS status
  20  * @dev: the PCI device
  21  *
  22  * Returns 1 if ATS capability is enabled, or 0 if not.
  23  */
  24 static inline int pci_ats_enabled(struct pci_dev *dev)
  25 {
  26         return dev->ats && dev->ats->is_enabled;
  27 }
  28
  29 #else /* CONFIG_PCI_IOV */
  30
  31 static inline int pci_enable_ats(struct pci_dev *dev, int ps)
  32 {
  33         return -ENODEV;
  34 }
  35
  36 static inline void pci_disable_ats(struct pci_dev *dev)
  37 {
  38 }
  39
  40 static inline int pci_ats_queue_depth(struct pci_dev *dev)
  41 {
  42         return -ENODEV;
  43 }
  44
  45 static inline int pci_ats_enabled(struct pci_dev *dev)
  46 {
  47         return 0;
  48 }
  49
  50 #endif /* CONFIG_PCI_IOV */
  51
  52 #endif /* LINUX_PCI_ATS_H*/