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https://github.com/edk2-porting/linux-next.git
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c55fa78b13
When the Xen PCI backend is told to enable or disable MSI/MSI-X functions, the initial domain performs these operations. The initial domain needs to know which domain (guest) is going to use the PCI device so when it makes the appropiate hypercall to retrieve the MSI/MSI-X vector it will also assign the PCI device to the appropiate domain (guest). This boils down to us needing a mechanism to find, set and unset the domain id that will be using the device. [v2: EXPORT_SYMBOL -> EXPORT_SYMBOL_GPL.] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
#ifndef _ASM_X86_XEN_PCI_H
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#define _ASM_X86_XEN_PCI_H
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#if defined(CONFIG_PCI_XEN)
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extern int __init pci_xen_init(void);
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extern int __init pci_xen_hvm_init(void);
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#define pci_xen 1
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#else
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#define pci_xen 0
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#define pci_xen_init (0)
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static inline int pci_xen_hvm_init(void)
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{
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return -1;
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}
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#endif
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#if defined(CONFIG_XEN_DOM0)
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void __init xen_setup_pirqs(void);
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int xen_find_device_domain_owner(struct pci_dev *dev);
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int xen_register_device_domain_owner(struct pci_dev *dev, uint16_t domain);
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int xen_unregister_device_domain_owner(struct pci_dev *dev);
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#else
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static inline void __init xen_setup_pirqs(void)
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{
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}
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static inline int xen_find_device_domain_owner(struct pci_dev *dev)
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{
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return -1;
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}
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static inline int xen_register_device_domain_owner(struct pci_dev *dev,
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uint16_t domain)
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{
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return -1;
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}
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static inline int xen_unregister_device_domain_owner(struct pci_dev *dev)
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{
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return -1;
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}
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#endif
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#if defined(CONFIG_PCI_MSI)
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#if defined(CONFIG_PCI_XEN)
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/* The drivers/pci/xen-pcifront.c sets this structure to
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* its own functions.
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*/
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struct xen_pci_frontend_ops {
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int (*enable_msi)(struct pci_dev *dev, int vectors[]);
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void (*disable_msi)(struct pci_dev *dev);
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int (*enable_msix)(struct pci_dev *dev, int vectors[], int nvec);
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void (*disable_msix)(struct pci_dev *dev);
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};
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extern struct xen_pci_frontend_ops *xen_pci_frontend;
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static inline int xen_pci_frontend_enable_msi(struct pci_dev *dev,
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int vectors[])
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{
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if (xen_pci_frontend && xen_pci_frontend->enable_msi)
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return xen_pci_frontend->enable_msi(dev, vectors);
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return -ENODEV;
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}
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static inline void xen_pci_frontend_disable_msi(struct pci_dev *dev)
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{
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if (xen_pci_frontend && xen_pci_frontend->disable_msi)
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xen_pci_frontend->disable_msi(dev);
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}
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static inline int xen_pci_frontend_enable_msix(struct pci_dev *dev,
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int vectors[], int nvec)
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{
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if (xen_pci_frontend && xen_pci_frontend->enable_msix)
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return xen_pci_frontend->enable_msix(dev, vectors, nvec);
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return -ENODEV;
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}
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static inline void xen_pci_frontend_disable_msix(struct pci_dev *dev)
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{
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if (xen_pci_frontend && xen_pci_frontend->disable_msix)
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xen_pci_frontend->disable_msix(dev);
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}
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#endif /* CONFIG_PCI_XEN */
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#endif /* CONFIG_PCI_MSI */
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#endif /* _ASM_X86_XEN_PCI_H */
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