drivers/xen/events/events_internal.h

   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__ */