LXR linux/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)
   6extern int __init pci_xen_init(void);
   7extern 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)
  12static inline int pci_xen_hvm_init(void)
  13{
  14        return -1;
  15}
  16#endif
  17#ifdef CONFIG_XEN_PV_DOM0
  18int __init pci_xen_initial_domain(void);
  19#else
  20static inline int __init pci_xen_initial_domain(void)
  21{
  22        return -1;
  23}
  24#endif
  25
  26#if defined(CONFIG_PCI_MSI)
  27#if defined(CONFIG_PCI_XEN)
  28/* The drivers/pci/xen-pcifront.c sets this structure to
  29 * its own functions.
  30 */
  31struct xen_pci_frontend_ops {
  32        int (*enable_msi)(struct pci_dev *dev, int vectors[]);
  33        void (*disable_msi)(struct pci_dev *dev);
  34        int (*enable_msix)(struct pci_dev *dev, int vectors[], int nvec);
  35        void (*disable_msix)(struct pci_dev *dev);
  36};
  37
  38extern struct xen_pci_frontend_ops *xen_pci_frontend;
  39
  40static inline int xen_pci_frontend_enable_msi(struct pci_dev *dev,
  41                                              int vectors[])
  42{
  43        if (xen_pci_frontend && xen_pci_frontend->enable_msi)
  44                return xen_pci_frontend->enable_msi(dev, vectors);
  45        return -ENOSYS;
  46}
  47static inline void xen_pci_frontend_disable_msi(struct pci_dev *dev)
  48{
  49        if (xen_pci_frontend && xen_pci_frontend->disable_msi)
  50                        xen_pci_frontend->disable_msi(dev);
  51}
  52static inline int xen_pci_frontend_enable_msix(struct pci_dev *dev,
  53                                               int vectors[], int nvec)
  54{
  55        if (xen_pci_frontend && xen_pci_frontend->enable_msix)
  56                return xen_pci_frontend->enable_msix(dev, vectors, nvec);
  57        return -ENOSYS;
  58}
  59static inline void xen_pci_frontend_disable_msix(struct pci_dev *dev)
  60{
  61        if (xen_pci_frontend && xen_pci_frontend->disable_msix)
  62                        xen_pci_frontend->disable_msix(dev);
  63}
  64#endif /* CONFIG_PCI_XEN */
  65#endif /* CONFIG_PCI_MSI */
  66
  67#endif  /* _ASM_X86_XEN_PCI_H */
  68