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1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef _XEN_EVENTS_H3#define _XEN_EVENTS_H4 5#include <linux/interrupt.h>6#include <linux/irq.h>7#ifdef CONFIG_PCI_MSI8#include <linux/msi.h>9#endif10 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 bindings52 * 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 *_lateeoi58 * 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 0x0000000163 64#define XEN_IRQ_PRIORITY_MAX EVTCHN_FIFO_PRIORITY_MAX65#define XEN_IRQ_PRIORITY_DEFAULT EVTCHN_FIFO_PRIORITY_DEFAULT66#define XEN_IRQ_PRIORITY_MIN EVTCHN_FIFO_PRIORITY_MIN67int xen_set_irq_priority(unsigned irq, unsigned priority);68 69/*70 * Allow extra references to event channels exposed to userspace by evtchn71 */72int evtchn_make_refcounted(evtchn_port_t evtchn, bool is_static);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);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);91bool xen_test_irq_pending(int irq);92 93/* Poll waiting for an irq to become pending. In the usual case, the94 irq will be disabled so it won't deliver an interrupt. */95void xen_poll_irq(int irq);96 97/* Poll waiting for an irq to become pending with a timeout. In the usual case,98 * the irq will be disabled so it won't deliver an interrupt. */99void xen_poll_irq_timeout(int irq, u64 timeout);100 101/* Determine the IRQ which is bound to an event channel */102unsigned int irq_from_evtchn(evtchn_port_t evtchn);103int irq_evtchn_from_virq(unsigned int cpu, unsigned int virq,104 evtchn_port_t *evtchn);105 106int xen_set_callback_via(uint64_t via);107int xen_evtchn_do_upcall(void);108 109/* Bind a pirq for a physical interrupt to an irq. */110int xen_bind_pirq_gsi_to_irq(unsigned gsi,111 unsigned pirq, int shareable, char *name);112 113#ifdef CONFIG_PCI_MSI114/* Allocate a pirq for a MSI style physical interrupt. */115int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc);116/* Bind an PSI pirq to an irq. */117int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,118 int pirq, int nvec, const char *name, domid_t domid);119#endif120 121/* De-allocates the above mentioned physical interrupt. */122int xen_destroy_irq(int irq);123 124/* Return the pirq allocated to the irq. */125int xen_pirq_from_irq(unsigned irq);126 127/* Return the irq allocated to the gsi */128int xen_irq_from_gsi(unsigned gsi);129 130/* Determine whether to ignore this IRQ if it is passed to a guest. */131int xen_test_irq_shared(int irq);132 133/* initialize Xen IRQ subsystem */134void xen_init_IRQ(void);135 136irqreturn_t xen_debug_interrupt(int irq, void *dev_id);137 138static inline void xen_evtchn_close(evtchn_port_t port)139{140 struct evtchn_close close;141 142 close.port = port;143 if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)144 BUG();145}146 147extern bool xen_fifo_events;148 149#endif /* _XEN_EVENTS_H */150