LXR linux/include/xen/events.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _XEN_EVENTS_H
   3#define _XEN_EVENTS_H
   4
   5#include <linux/interrupt.h>
   6#ifdef CONFIG_PCI_MSI
   7#include <linux/msi.h>
   8#endif
   9
  10#include <xen/interface/event_channel.h>
  11#include <asm/xen/hypercall.h>
  12#include <asm/xen/events.h>
  13
  14unsigned xen_evtchn_nr_channels(void);
  15
  16int bind_evtchn_to_irq(unsigned int evtchn);
  17int bind_evtchn_to_irqhandler(unsigned int evtchn,
  18                              irq_handler_t handler,
  19                              unsigned long irqflags, const char *devname,
  20                              void *dev_id);
  21int bind_virq_to_irq(unsigned int virq, unsigned int cpu, bool percpu);
  22int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
  23                            irq_handler_t handler,
  24                            unsigned long irqflags, const char *devname,
  25                            void *dev_id);
  26int bind_ipi_to_irqhandler(enum ipi_vector ipi,
  27                           unsigned int cpu,
  28                           irq_handler_t handler,
  29                           unsigned long irqflags,
  30                           const char *devname,
  31                           void *dev_id);
  32int bind_interdomain_evtchn_to_irq(unsigned int remote_domain,
  33                                   unsigned int remote_port);
  34int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain,
  35                                          unsigned int remote_port,
  36                                          irq_handler_t handler,
  37                                          unsigned long irqflags,
  38                                          const char *devname,
  39                                          void *dev_id);
  40
  41/*
  42 * Common unbind function for all event sources. Takes IRQ to unbind from.
  43 * Automatically closes the underlying event channel (even for bindings
  44 * made with bind_evtchn_to_irqhandler()).
  45 */
  46void unbind_from_irqhandler(unsigned int irq, void *dev_id);
  47
  48#define XEN_IRQ_PRIORITY_MAX     EVTCHN_FIFO_PRIORITY_MAX
  49#define XEN_IRQ_PRIORITY_DEFAULT EVTCHN_FIFO_PRIORITY_DEFAULT
  50#define XEN_IRQ_PRIORITY_MIN     EVTCHN_FIFO_PRIORITY_MIN
  51int xen_set_irq_priority(unsigned irq, unsigned priority);
  52
  53/*
  54 * Allow extra references to event channels exposed to userspace by evtchn
  55 */
  56int evtchn_make_refcounted(unsigned int evtchn);
  57int evtchn_get(unsigned int evtchn);
  58void evtchn_put(unsigned int evtchn);
  59
  60void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector);
  61void rebind_evtchn_irq(int evtchn, int irq);
  62int xen_rebind_evtchn_to_cpu(int evtchn, unsigned tcpu);
  63
  64static inline void notify_remote_via_evtchn(int port)
  65{
  66        struct evtchn_send send = { .port = port };
  67        (void)HYPERVISOR_event_channel_op(EVTCHNOP_send, &send);
  68}
  69
  70void notify_remote_via_irq(int irq);
  71
  72void xen_irq_resume(void);
  73
  74/* Clear an irq's pending state, in preparation for polling on it */
  75void xen_clear_irq_pending(int irq);
  76void xen_set_irq_pending(int irq);
  77bool xen_test_irq_pending(int irq);
  78
  79/* Poll waiting for an irq to become pending.  In the usual case, the
  80   irq will be disabled so it won't deliver an interrupt. */
  81void xen_poll_irq(int irq);
  82
  83/* Poll waiting for an irq to become pending with a timeout.  In the usual case,
  84 * the irq will be disabled so it won't deliver an interrupt. */
  85void xen_poll_irq_timeout(int irq, u64 timeout);
  86
  87/* Determine the IRQ which is bound to an event channel */
  88unsigned irq_from_evtchn(unsigned int evtchn);
  89int irq_from_virq(unsigned int cpu, unsigned int virq);
  90unsigned int evtchn_from_irq(unsigned irq);
  91
  92#ifdef CONFIG_XEN_PVHVM
  93/* Xen HVM evtchn vector callback */
  94void xen_hvm_callback_vector(void);
  95#ifdef CONFIG_TRACING
  96#define trace_xen_hvm_callback_vector xen_hvm_callback_vector
  97#endif
  98#endif
  99int xen_set_callback_via(uint64_t via);
 100void xen_evtchn_do_upcall(struct pt_regs *regs);
 101void xen_hvm_evtchn_do_upcall(void);
 102
 103/* Bind a pirq for a physical interrupt to an irq. */
 104int xen_bind_pirq_gsi_to_irq(unsigned gsi,
 105                             unsigned pirq, int shareable, char *name);
 106
 107#ifdef CONFIG_PCI_MSI
 108/* Allocate a pirq for a MSI style physical interrupt. */
 109int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc);
 110/* Bind an PSI pirq to an irq. */
 111int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
 112                             int pirq, int nvec, const char *name, domid_t domid);
 113#endif
 114
 115/* De-allocates the above mentioned physical interrupt. */
 116int xen_destroy_irq(int irq);
 117
 118/* Return irq from pirq */
 119int xen_irq_from_pirq(unsigned pirq);
 120
 121/* Return the pirq allocated to the irq. */
 122int xen_pirq_from_irq(unsigned irq);
 123
 124/* Return the irq allocated to the gsi */
 125int xen_irq_from_gsi(unsigned gsi);
 126
 127/* Determine whether to ignore this IRQ if it is passed to a guest. */
 128int xen_test_irq_shared(int irq);
 129
 130/* initialize Xen IRQ subsystem */
 131void xen_init_IRQ(void);
 132#endif  /* _XEN_EVENTS_H */
 133