linux/include/xen/events.h
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   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _XEN_EVENTS_H
   3#define _XEN_EVENTS_H
   4
   5#include <linux/interrupt.h>
   6#include <linux/irq.h>
   7#ifdef CONFIG_PCI_MSI
   8#include <linux/msi.h>
   9#endif
  10
  11#include <xen/interface/event_channel.h>
  12#include <asm/xen/hypercall.h>
  13#include <asm/xen/events.h>
  14
  15unsigned xen_evtchn_nr_channels(void);
  16
  17int bind_evtchn_to_irq(unsigned int evtchn);
  18int bind_evtchn_to_irqhandler(unsigned int evtchn,
  19                              irq_handler_t handler,
  20                              unsigned long irqflags, const char *devname,
  21                              void *dev_id);
  22int bind_virq_to_irq(unsigned int virq, unsigned int cpu, bool percpu);
  23int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
  24                            irq_handler_t handler,
  25                            unsigned long irqflags, const char *devname,
  26                            void *dev_id);
  27int bind_ipi_to_irqhandler(enum ipi_vector ipi,
  28                           unsigned int cpu,
  29                           irq_handler_t handler,
  30                           unsigned long irqflags,
  31                           const char *devname,
  32                           void *dev_id);
  33int bind_interdomain_evtchn_to_irq(unsigned int remote_domain,
  34                                   unsigned int remote_port);
  35int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain,
  36                                          unsigned int remote_port,
  37                                          irq_handler_t handler,
  38                                          unsigned long irqflags,
  39                                          const char *devname,
  40                                          void *dev_id);
  41
  42/*
  43 * Common unbind function for all event sources. Takes IRQ to unbind from.
  44 * Automatically closes the underlying event channel (even for bindings
  45 * made with bind_evtchn_to_irqhandler()).
  46 */
  47void unbind_from_irqhandler(unsigned int irq, void *dev_id);
  48
  49#define XEN_IRQ_PRIORITY_MAX     EVTCHN_FIFO_PRIORITY_MAX
  50#define XEN_IRQ_PRIORITY_DEFAULT EVTCHN_FIFO_PRIORITY_DEFAULT
  51#define XEN_IRQ_PRIORITY_MIN     EVTCHN_FIFO_PRIORITY_MIN
  52int xen_set_irq_priority(unsigned irq, unsigned priority);
  53
  54/*
  55 * Allow extra references to event channels exposed to userspace by evtchn
  56 */
  57int evtchn_make_refcounted(unsigned int evtchn);
  58int evtchn_get(unsigned int evtchn);
  59void evtchn_put(unsigned int evtchn);
  60
  61void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector);
  62void rebind_evtchn_irq(int evtchn, int irq);
  63int xen_set_affinity_evtchn(struct irq_desc *desc, unsigned int tcpu);
  64
  65static inline void notify_remote_via_evtchn(int port)
  66{
  67        struct evtchn_send send = { .port = port };
  68        (void)HYPERVISOR_event_channel_op(EVTCHNOP_send, &send);
  69}
  70
  71void notify_remote_via_irq(int irq);
  72
  73void xen_irq_resume(void);
  74
  75/* Clear an irq's pending state, in preparation for polling on it */
  76void xen_clear_irq_pending(int irq);
  77void xen_set_irq_pending(int irq);
  78bool xen_test_irq_pending(int irq);
  79
  80/* Poll waiting for an irq to become pending.  In the usual case, the
  81   irq will be disabled so it won't deliver an interrupt. */
  82void xen_poll_irq(int irq);
  83
  84/* Poll waiting for an irq to become pending with a timeout.  In the usual case,
  85 * the irq will be disabled so it won't deliver an interrupt. */
  86void xen_poll_irq_timeout(int irq, u64 timeout);
  87
  88/* Determine the IRQ which is bound to an event channel */
  89unsigned irq_from_evtchn(unsigned int evtchn);
  90int irq_from_virq(unsigned int cpu, unsigned int virq);
  91unsigned int evtchn_from_irq(unsigned irq);
  92
  93#ifdef CONFIG_XEN_PVHVM
  94/* Xen HVM evtchn vector callback */
  95void xen_hvm_callback_vector(void);
  96#ifdef CONFIG_TRACING
  97#define trace_xen_hvm_callback_vector xen_hvm_callback_vector
  98#endif
  99#endif
 100int xen_set_callback_via(uint64_t via);
 101void xen_evtchn_do_upcall(struct pt_regs *regs);
 102void xen_hvm_evtchn_do_upcall(void);
 103
 104/* Bind a pirq for a physical interrupt to an irq. */
 105int xen_bind_pirq_gsi_to_irq(unsigned gsi,
 106                             unsigned pirq, int shareable, char *name);
 107
 108#ifdef CONFIG_PCI_MSI
 109/* Allocate a pirq for a MSI style physical interrupt. */
 110int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc);
 111/* Bind an PSI pirq to an irq. */
 112int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
 113                             int pirq, int nvec, const char *name, domid_t domid);
 114#endif
 115
 116/* De-allocates the above mentioned physical interrupt. */
 117int xen_destroy_irq(int irq);
 118
 119/* Return irq from pirq */
 120int xen_irq_from_pirq(unsigned pirq);
 121
 122/* Return the pirq allocated to the irq. */
 123int xen_pirq_from_irq(unsigned irq);
 124
 125/* Return the irq allocated to the gsi */
 126int xen_irq_from_gsi(unsigned gsi);
 127
 128/* Determine whether to ignore this IRQ if it is passed to a guest. */
 129int xen_test_irq_shared(int irq);
 130
 131/* initialize Xen IRQ subsystem */
 132void xen_init_IRQ(void);
 133#endif  /* _XEN_EVENTS_H */
 134