1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Xen Event Channels (internal header)
4 *
5 * Copyright (C) 2013 Citrix Systems R&D Ltd.
6 */
7#ifndef __EVENTS_INTERNAL_H__
8#define __EVENTS_INTERNAL_H__
9
10struct evtchn_loop_ctrl;
11
12struct evtchn_ops {
13 unsigned (*max_channels)(void);
14 unsigned (*nr_channels)(void);
15
16 int (*setup)(evtchn_port_t port);
17 void (*remove)(evtchn_port_t port, unsigned int cpu);
18 void (*bind_to_cpu)(evtchn_port_t evtchn, unsigned int cpu,
19 unsigned int old_cpu);
20
21 void (*clear_pending)(evtchn_port_t port);
22 void (*set_pending)(evtchn_port_t port);
23 bool (*is_pending)(evtchn_port_t port);
24 void (*mask)(evtchn_port_t port);
25 void (*unmask)(evtchn_port_t port);
26
27 void (*handle_events)(unsigned cpu, struct evtchn_loop_ctrl *ctrl);
28 void (*resume)(void);
29
30 int (*percpu_init)(unsigned int cpu);
31 int (*percpu_deinit)(unsigned int cpu);
32};
33
34extern const struct evtchn_ops *evtchn_ops;
35
36int get_evtchn_to_irq(evtchn_port_t evtchn);
37void handle_irq_for_port(evtchn_port_t port, struct evtchn_loop_ctrl *ctrl);
38
39unsigned int cpu_from_evtchn(evtchn_port_t evtchn);
40
41static inline unsigned xen_evtchn_max_channels(void)
42{
43 return evtchn_ops->max_channels();
44}
45
46/*
47 * Do any ABI specific setup for a bound event channel before it can
48 * be unmasked and used.
49 */
50static inline int xen_evtchn_port_setup(evtchn_port_t evtchn)
51{
52 if (evtchn_ops->setup)
53 return evtchn_ops->setup(evtchn);
54 return 0;
55}
56
57static inline void xen_evtchn_port_remove(evtchn_port_t evtchn,
58 unsigned int cpu)
59{
60 if (evtchn_ops->remove)
61 evtchn_ops->remove(evtchn, cpu);
62}
63
64static inline void xen_evtchn_port_bind_to_cpu(evtchn_port_t evtchn,
65 unsigned int cpu,
66 unsigned int old_cpu)
67{
68 evtchn_ops->bind_to_cpu(evtchn, cpu, old_cpu);
69}
70
71static inline void clear_evtchn(evtchn_port_t port)
72{
73 evtchn_ops->clear_pending(port);
74}
75
76static inline void set_evtchn(evtchn_port_t port)
77{
78 evtchn_ops->set_pending(port);
79}
80
81static inline bool test_evtchn(evtchn_port_t port)
82{
83 return evtchn_ops->is_pending(port);
84}
85
86static inline void mask_evtchn(evtchn_port_t port)
87{
88 return evtchn_ops->mask(port);
89}
90
91static inline void unmask_evtchn(evtchn_port_t port)
92{
93 return evtchn_ops->unmask(port);
94}
95
96static inline void xen_evtchn_handle_events(unsigned cpu,
97 struct evtchn_loop_ctrl *ctrl)
98{
99 return evtchn_ops->handle_events(cpu, ctrl);
100}
101
102static inline void xen_evtchn_resume(void)
103{
104 if (evtchn_ops->resume)
105 evtchn_ops->resume();
106}
107
108void xen_evtchn_2l_init(void);
109int xen_evtchn_fifo_init(void);
110
111#endif /* #ifndef __EVENTS_INTERNAL_H__ */
112

source code of linux/drivers/xen/events/events_internal.h