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 (*bind_to_cpu)(evtchn_port_t evtchn, unsigned int cpu, 18 unsigned int old_cpu); 19 20 void (*clear_pending)(evtchn_port_t port); 21 void (*set_pending)(evtchn_port_t port); 22 bool (*is_pending)(evtchn_port_t port); 23 bool (*test_and_set_mask)(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 int get_evtchn_to_irq(evtchn_port_t evtchn); 37 void handle_irq_for_port(evtchn_port_t port, struct evtchn_loop_ctrl *ctrl); 38 39 unsigned int cpu_from_evtchn(evtchn_port_t evtchn); 40 41 static 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 */ 50 static 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 57 static inline void xen_evtchn_port_bind_to_cpu(evtchn_port_t evtchn, 58 unsigned int cpu, 59 unsigned int old_cpu) 60 { 61 evtchn_ops->bind_to_cpu(evtchn, cpu, old_cpu); 62 } 63 64 static inline void clear_evtchn(evtchn_port_t port) 65 { 66 evtchn_ops->clear_pending(port); 67 } 68 69 static inline void set_evtchn(evtchn_port_t port) 70 { 71 evtchn_ops->set_pending(port); 72 } 73 74 static inline bool test_evtchn(evtchn_port_t port) 75 { 76 return evtchn_ops->is_pending(port); 77 } 78 79 static inline bool test_and_set_mask(evtchn_port_t port) 80 { 81 return evtchn_ops->test_and_set_mask(port); 82 } 83 84 static inline void mask_evtchn(evtchn_port_t port) 85 { 86 return evtchn_ops->mask(port); 87 } 88 89 static inline void unmask_evtchn(evtchn_port_t port) 90 { 91 return evtchn_ops->unmask(port); 92 } 93 94 static inline void xen_evtchn_handle_events(unsigned cpu, 95 struct evtchn_loop_ctrl *ctrl) 96 { 97 return evtchn_ops->handle_events(cpu, ctrl); 98 } 99 100 static inline void xen_evtchn_resume(void) 101 { 102 if (evtchn_ops->resume) 103 evtchn_ops->resume(); 104 } 105 106 void xen_evtchn_2l_init(void); 107 int xen_evtchn_fifo_init(void); 108 109 #endif /* #ifndef __EVENTS_INTERNAL_H__ */ 110