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 (*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__ */