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 10 struct evtchn_loop_ctrl; 11 12 struct 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 34 extern const struct evtchn_ops *evtchn_ops; 35 36 void handle_irq_for_port(evtchn_port_t port, struct evtchn_loop_ctrl *ctrl); 37 38 unsigned int cpu_from_evtchn(evtchn_port_t evtchn); 39 40 static 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 */ 49 static 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 56 static 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 63 static 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 70 static inline void clear_evtchn(evtchn_port_t port) 71 { 72 evtchn_ops->clear_pending(port); 73 } 74 75 static inline void set_evtchn(evtchn_port_t port) 76 { 77 evtchn_ops->set_pending(port); 78 } 79 80 static inline bool test_evtchn(evtchn_port_t port) 81 { 82 return evtchn_ops->is_pending(port); 83 } 84 85 static inline void mask_evtchn(evtchn_port_t port) 86 { 87 return evtchn_ops->mask(port); 88 } 89 90 static inline void unmask_evtchn(evtchn_port_t port) 91 { 92 return evtchn_ops->unmask(port); 93 } 94 95 static inline void xen_evtchn_handle_events(unsigned cpu, 96 struct evtchn_loop_ctrl *ctrl) 97 { 98 return evtchn_ops->handle_events(cpu, ctrl); 99 } 100 101 static inline void xen_evtchn_resume(void) 102 { 103 if (evtchn_ops->resume) 104 evtchn_ops->resume(); 105 } 106 107 void xen_evtchn_2l_init(void); 108 int xen_evtchn_fifo_init(void); 109 110 #endif /* #ifndef __EVENTS_INTERNAL_H__ */ 111