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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
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, 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, the
94 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_MSI
114/* 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#endif
120
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 */