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_irq_lateeoi(evtchn_port_t evtchn);
  21int bind_evtchn_to_irqhandler(evtchn_port_t evtchn,
  22                              irq_handler_t handler,
  23                              unsigned long irqflags, const char *devname,
  24                              void *dev_id);
  25int bind_evtchn_to_irqhandler_lateeoi(evtchn_port_t evtchn,
  26                              irq_handler_t handler,
  27                              unsigned long irqflags, const char *devname,
  28                              void *dev_id);
  29int bind_virq_to_irq(unsigned int virq, unsigned int cpu, bool percpu);
  30int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
  31                            irq_handler_t handler,
  32                            unsigned long irqflags, const char *devname,
  33                            void *dev_id);
  34int bind_ipi_to_irqhandler(enum ipi_vector ipi,
  35                           unsigned int cpu,
  36                           irq_handler_t handler,
  37                           unsigned long irqflags,
  38                           const char *devname,
  39                           void *dev_id);
  40int bind_interdomain_evtchn_to_irq_lateeoi(struct xenbus_device *dev,
  41                                           evtchn_port_t remote_port);
  42int bind_interdomain_evtchn_to_irqhandler_lateeoi(struct xenbus_device *dev,
  43                                                  evtchn_port_t remote_port,
  44                                                  irq_handler_t handler,
  45                                                  unsigned long irqflags,
  46                                                  const char *devname,
  47                                                  void *dev_id);
  48
  49/*
  50 * Common unbind function for all event sources. Takes IRQ to unbind from.
  51 * Automatically closes the underlying event channel (even for bindings
  52 * made with bind_evtchn_to_irqhandler()).
  53 */
  54void unbind_from_irqhandler(unsigned int irq, void *dev_id);
  55
  56/*
  57 * Send late EOI for an IRQ bound to an event channel via one of the *_lateeoi
  58 * functions above.
  59 */
  60void xen_irq_lateeoi(unsigned int irq, unsigned int eoi_flags);
  61/* Signal an event was spurious, i.e. there was no action resulting from it. */
  62#define XEN_EOI_FLAG_SPURIOUS   0x00000001
  63
  64#define XEN_IRQ_PRIORITY_MAX     EVTCHN_FIFO_PRIORITY_MAX
  65#define XEN_IRQ_PRIORITY_DEFAULT EVTCHN_FIFO_PRIORITY_DEFAULT
  66#define XEN_IRQ_PRIORITY_MIN     EVTCHN_FIFO_PRIORITY_MIN
  67int xen_set_irq_priority(unsigned irq, unsigned priority);
  68
  69/*
  70 * Allow extra references to event channels exposed to userspace by evtchn
  71 */
  72int evtchn_make_refcounted(evtchn_port_t evtchn);
  73int evtchn_get(evtchn_port_t evtchn);
  74void evtchn_put(evtchn_port_t evtchn);
  75
  76void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector);
  77void rebind_evtchn_irq(evtchn_port_t evtchn, int irq);
  78int xen_set_affinity_evtchn(struct irq_desc *desc, unsigned int tcpu);
  79
  80static inline void notify_remote_via_evtchn(evtchn_port_t port)
  81{
  82        struct evtchn_send send = { .port = port };
  83        (void)HYPERVISOR_event_channel_op(EVTCHNOP_send, &send);
  84}
  85
  86void notify_remote_via_irq(int irq);
  87
  88void xen_irq_resume(void);
  89
  90/* Clear an irq's pending state, in preparation for polling on it */
  91void xen_clear_irq_pending(int irq);
  92void xen_set_irq_pending(int irq);
  93bool xen_test_irq_pending(int irq);
  94
  95/* Poll waiting for an irq to become pending.  In the usual case, the
  96   irq will be disabled so it won't deliver an interrupt. */
  97void xen_poll_irq(int irq);
  98
  99/* Poll waiting for an irq to become pending with a timeout.  In the usual case,
 100 * the irq will be disabled so it won't deliver an interrupt. */
 101void xen_poll_irq_timeout(int irq, u64 timeout);
 102
 103/* Determine the IRQ which is bound to an event channel */
 104unsigned int irq_from_evtchn(evtchn_port_t evtchn);
 105int irq_from_virq(unsigned int cpu, unsigned int virq);
 106evtchn_port_t evtchn_from_irq(unsigned irq);
 107
 108int xen_set_callback_via(uint64_t via);
 109void xen_evtchn_do_upcall(struct pt_regs *regs);
 110void xen_hvm_evtchn_do_upcall(void);
 111
 112/* Bind a pirq for a physical interrupt to an irq. */
 113int xen_bind_pirq_gsi_to_irq(unsigned gsi,
 114                             unsigned pirq, int shareable, char *name);
 115
 116#ifdef CONFIG_PCI_MSI
 117/* Allocate a pirq for a MSI style physical interrupt. */
 118int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc);
 119/* Bind an PSI pirq to an irq. */
 120int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
 121                             int pirq, int nvec, const char *name, domid_t domid);
 122#endif
 123
 124/* De-allocates the above mentioned physical interrupt. */
 125int xen_destroy_irq(int irq);
 126
 127/* Return irq from pirq */
 128int xen_irq_from_pirq(unsigned pirq);
 129
 130/* Return the pirq allocated to the irq. */
 131int xen_pirq_from_irq(unsigned irq);
 132
 133/* Return the irq allocated to the gsi */
 134int xen_irq_from_gsi(unsigned gsi);
 135
 136/* Determine whether to ignore this IRQ if it is passed to a guest. */
 137int xen_test_irq_shared(int irq);
 138
 139/* initialize Xen IRQ subsystem */
 140void xen_init_IRQ(void);
 141#endif  /* _XEN_EVENTS_H */
 142