arch/x86/include/asm/xen/pci.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_XEN_PCI_H
   3 #define _ASM_X86_XEN_PCI_H
   4
   5 #if defined(CONFIG_PCI_XEN)
   6 extern int __init pci_xen_init(void);
   7 extern int __init pci_xen_hvm_init(void);
   8 #define pci_xen 1
   9 #else
  10 #define pci_xen 0
  11 #define pci_xen_init (0)
  12 static inline int pci_xen_hvm_init(void)
  13 {
  14         return -1;
  15 }
  16 #endif
  17 #if defined(CONFIG_XEN_DOM0)
  18 int __init pci_xen_initial_domain(void);
  19 int xen_find_device_domain_owner(struct pci_dev *dev);
  20 int xen_register_device_domain_owner(struct pci_dev *dev, uint16_t domain);
  21 int xen_unregister_device_domain_owner(struct pci_dev *dev);
  22 #else
  23 static inline int __init pci_xen_initial_domain(void)
  24 {
  25         return -1;
  26 }
  27 static inline int xen_find_device_domain_owner(struct pci_dev *dev)
  28 {
  29         return -1;
  30 }
  31 static inline int xen_register_device_domain_owner(struct pci_dev *dev,
  32                                                    uint16_t domain)
  33 {
  34         return -1;
  35 }
  36 static inline int xen_unregister_device_domain_owner(struct pci_dev *dev)
  37 {
  38         return -1;
  39 }
  40 #endif
  41
  42 #if defined(CONFIG_PCI_MSI)
  43 #if defined(CONFIG_PCI_XEN)
  44 /* The drivers/pci/xen-pcifront.c sets this structure to
  45  * its own functions.
  46  */
  47 struct xen_pci_frontend_ops {
  48         int (*enable_msi)(struct pci_dev *dev, int vectors[]);
  49         void (*disable_msi)(struct pci_dev *dev);
  50         int (*enable_msix)(struct pci_dev *dev, int vectors[], int nvec);
  51         void (*disable_msix)(struct pci_dev *dev);
  52 };
  53
  54 extern struct xen_pci_frontend_ops *xen_pci_frontend;
  55
  56 static inline int xen_pci_frontend_enable_msi(struct pci_dev *dev,
  57                                               int vectors[])
  58 {
  59         if (xen_pci_frontend && xen_pci_frontend->enable_msi)
  60                 return xen_pci_frontend->enable_msi(dev, vectors);
  61         return -ENOSYS;
  62 }
  63 static inline void xen_pci_frontend_disable_msi(struct pci_dev *dev)
  64 {
  65         if (xen_pci_frontend && xen_pci_frontend->disable_msi)
  66                         xen_pci_frontend->disable_msi(dev);
  67 }
  68 static inline int xen_pci_frontend_enable_msix(struct pci_dev *dev,
  69                                                int vectors[], int nvec)
  70 {
  71         if (xen_pci_frontend && xen_pci_frontend->enable_msix)
  72                 return xen_pci_frontend->enable_msix(dev, vectors, nvec);
  73         return -ENOSYS;
  74 }
  75 static inline void xen_pci_frontend_disable_msix(struct pci_dev *dev)
  76 {
  77         if (xen_pci_frontend && xen_pci_frontend->disable_msix)
  78                         xen_pci_frontend->disable_msix(dev);
  79 }
  80 #endif /* CONFIG_PCI_XEN */
  81 #endif /* CONFIG_PCI_MSI */
  82
  83 #endif  /* _ASM_X86_XEN_PCI_H */