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
 36void handle_irq_for_port(evtchn_port_t port, struct evtchn_loop_ctrl *ctrl);
 37
 38unsigned int cpu_from_evtchn(evtchn_port_t evtchn);
 39
 40static inline unsigned xen_evtchn_max_channels(void)
 41{
 42	return evtchn_ops->max_channels();
 43}
 44
 45/*
 46 * Do any ABI specific setup for a bound event channel before it can
 47 * be unmasked and used.
 48 */
 49static inline int xen_evtchn_port_setup(evtchn_port_t evtchn)
 50{
 51	if (evtchn_ops->setup)
 52		return evtchn_ops->setup(evtchn);
 53	return 0;
 54}
 55
 56static inline void xen_evtchn_port_remove(evtchn_port_t evtchn,
 57					  unsigned int cpu)
 58{
 59	if (evtchn_ops->remove)
 60		evtchn_ops->remove(evtchn, cpu);
 61}
 62
 63static inline void xen_evtchn_port_bind_to_cpu(evtchn_port_t evtchn,
 64					       unsigned int cpu,
 65					       unsigned int old_cpu)
 66{
 67	evtchn_ops->bind_to_cpu(evtchn, cpu, old_cpu);
 68}
 69
 70static inline void clear_evtchn(evtchn_port_t port)
 71{
 72	evtchn_ops->clear_pending(port);
 73}
 74
 75static inline void set_evtchn(evtchn_port_t port)
 76{
 77	evtchn_ops->set_pending(port);
 78}
 79
 80static inline bool test_evtchn(evtchn_port_t port)
 81{
 82	return evtchn_ops->is_pending(port);
 83}
 84
 85static inline void mask_evtchn(evtchn_port_t port)
 86{
 87	return evtchn_ops->mask(port);
 88}
 89
 90static inline void unmask_evtchn(evtchn_port_t port)
 91{
 92	return evtchn_ops->unmask(port);
 93}
 94
 95static inline void xen_evtchn_handle_events(unsigned cpu,
 96					    struct evtchn_loop_ctrl *ctrl)
 97{
 98	return evtchn_ops->handle_events(cpu, ctrl);
 99}
100
101static inline void xen_evtchn_resume(void)
102{
103	if (evtchn_ops->resume)
104		evtchn_ops->resume();
105}
106
107void xen_evtchn_2l_init(void);
108int xen_evtchn_fifo_init(void);
109
110#endif /* #ifndef __EVENTS_INTERNAL_H__ */