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#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
  15struct xenbus_device;
  16
  17unsigned xen_evtchn_nr_channels(void);
  18
  19int bind_evtchn_to_irq(evtchn_port_t evtchn);
  20int bind_evtchn_to_irqhandler(evtchn_port_t evtchn,
  21                              irq_handler_t handler,
  22                              unsigned long irqflags, const char *devname,
  23                              void *dev_id);
  24int bind_evtchn_to_irqhandler_lateeoi(evtchn_port_t evtchn,
  25                              irq_handler_t handler,
  26                              unsigned long irqflags, const char *devname,
  27                              void *dev_id);
  28int bind_virq_to_irq(unsigned int virq, unsigned int cpu, bool percpu);
  29int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
  30                            irq_handler_t handler,
  31                            unsigned long irqflags, const char *devname,
  32                            void *dev_id);
  33int bind_ipi_to_irqhandler(enum ipi_vector ipi,
  34                           unsigned int cpu,
  35                           irq_handler_t handler,
  36                           unsigned long irqflags,
  37                           const char *devname,
  38                           void *dev_id);
  39int bind_interdomain_evtchn_to_irq_lateeoi(struct xenbus_device *dev,
  40                                           evtchn_port_t remote_port);
  41int bind_interdomain_evtchn_to_irqhandler_lateeoi(struct xenbus_device *dev,
  42                                                  evtchn_port_t remote_port,
  43                                                  irq_handler_t handler,
  44                                                  unsigned long irqflags,
  45                                                  const char *devname,
  46                                                  void *dev_id);
  47
  48/*
  49 * Common unbind function for all event sources. Takes IRQ to unbind from.
  50 * Automatically closes the underlying event channel (even for bindings
  51 * made with bind_evtchn_to_irqhandler()).
  52 */
  53void unbind_from_irqhandler(unsigned int irq, void *dev_id);
  54
  55/*
  56 * Send late EOI for an IRQ bound to an event channel via one of the *_lateeoi
  57 * functions above.
  58 */
  59void xen_irq_lateeoi(unsigned int irq, unsigned int eoi_flags);
  60/* Signal an event was spurious, i.e. there was no action resulting from it. */
  61#define XEN_EOI_FLAG_SPURIOUS   0x00000001
  62
  63#define XEN_IRQ_PRIORITY_MAX     EVTCHN_FIFO_PRIORITY_MAX
  64#define XEN_IRQ_PRIORITY_DEFAULT EVTCHN_FIFO_PRIORITY_DEFAULT
  65#define XEN_IRQ_PRIORITY_MIN     EVTCHN_FIFO_PRIORITY_MIN
  66int xen_set_irq_priority(unsigned irq, unsigned priority);
  67
  68/*
  69 * Allow extra references to event channels exposed to userspace by evtchn
  70 */
  71int evtchn_make_refcounted(evtchn_port_t evtchn);
  72int evtchn_get(evtchn_port_t evtchn);
  73void evtchn_put(evtchn_port_t evtchn);
  74
  75void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector);
  76void rebind_evtchn_irq(evtchn_port_t evtchn, int irq);
  77int xen_set_affinity_evtchn(struct irq_desc *desc, unsigned int tcpu);
  78
  79static inline void notify_remote_via_evtchn(evtchn_port_t port)
  80{
  81        struct evtchn_send send = { .port = port };
  82        (void)HYPERVISOR_event_channel_op(EVTCHNOP_send, &send);
  83}
  84
  85void notify_remote_via_irq(int irq);
  86
  87void xen_irq_resume(void);
  88
  89/* Clear an irq's pending state, in preparation for polling on it */
  90void xen_clear_irq_pending(int irq);
  91void xen_set_irq_pending(int irq);
  92bool xen_test_irq_pending(int irq);
  93
  94/* Poll waiting for an irq to become pending.  In the usual case, the
  95   irq will be disabled so it won't deliver an interrupt. */
  96void xen_poll_irq(int irq);
  97
  98/* Poll waiting for an irq to become pending with a timeout.  In the usual case,
  99 * the irq will be disabled so it won't deliver an interrupt. */
 100void xen_poll_irq_timeout(int irq, u64 timeout);
 101
 102/* Determine the IRQ which is bound to an event channel */
 103unsigned int irq_from_evtchn(evtchn_port_t evtchn);
 104int irq_from_virq(unsigned int cpu, unsigned int virq);
 105evtchn_port_t evtchn_from_irq(unsigned irq);
 106
 107int xen_set_callback_via(uint64_t via);
 108void xen_evtchn_do_upcall(struct pt_regs *regs);
 109void xen_hvm_evtchn_do_upcall(void);
 110
 111/* Bind a pirq for a physical interrupt to an irq. */
 112int xen_bind_pirq_gsi_to_irq(unsigned gsi,
 113                             unsigned pirq, int shareable, char *name);
 114
 115#ifdef CONFIG_PCI_MSI
 116/* Allocate a pirq for a MSI style physical interrupt. */
 117int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc);
 118/* Bind an PSI pirq to an irq. */
 119int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
 120                             int pirq, int nvec, const char *name, domid_t domid);
 121#endif
 122
 123/* De-allocates the above mentioned physical interrupt. */
 124int xen_destroy_irq(int irq);
 125
 126/* Return irq from pirq */
 127int xen_irq_from_pirq(unsigned pirq);
 128
 129/* Return the pirq allocated to the irq. */
 130int xen_pirq_from_irq(unsigned irq);
 131
 132/* Return the irq allocated to the gsi */
 133int xen_irq_from_gsi(unsigned gsi);
 134
 135/* Determine whether to ignore this IRQ if it is passed to a guest. */
 136int xen_test_irq_shared(int irq);
 137
 138/* initialize Xen IRQ subsystem */
 139void xen_init_IRQ(void);
 140#endif  /* _XEN_EVENTS_H */
 141