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