2 * Xen Event Channels (internal header)
4 * Copyright (C) 2013 Citrix Systems R&D Ltd.
6 * This source code is licensed under the GNU General Public License,
7 * Version 2 or later. See the file COPYING for more details.
9 #ifndef __EVENTS_INTERNAL_H__
10 #define __EVENTS_INTERNAL_H__
12 /* Interrupt types. */
22 * Packed IRQ information:
23 * type - enum xen_irq_type
24 * event channel - irq->event channel mapping
25 * cpu - cpu this event channel is bound to
26 * index - type-specific information:
27 * PIRQ - vector, with MSB being "needs EIO", or physical IRQ of the HVM
28 * guest, or GSI (real passthrough IRQ) of the device.
34 struct list_head list;
36 enum xen_irq_type type; /* type */
38 unsigned int evtchn; /* event channel */
39 unsigned short cpu; /* cpu bound */
54 #define PIRQ_NEEDS_EOI (1 << 0)
55 #define PIRQ_SHAREABLE (1 << 1)
58 unsigned (*max_channels)(void);
59 unsigned (*nr_channels)(void);
61 int (*setup)(struct irq_info *info);
62 void (*bind_to_cpu)(struct irq_info *info, unsigned cpu);
64 void (*clear_pending)(unsigned port);
65 void (*set_pending)(unsigned port);
66 bool (*is_pending)(unsigned port);
67 bool (*test_and_set_mask)(unsigned port);
68 void (*mask)(unsigned port);
69 void (*unmask)(unsigned port);
71 void (*handle_events)(unsigned cpu);
75 extern const struct evtchn_ops *evtchn_ops;
77 extern int **evtchn_to_irq;
78 int get_evtchn_to_irq(unsigned int evtchn);
80 struct irq_info *info_for_irq(unsigned irq);
81 unsigned cpu_from_irq(unsigned irq);
82 unsigned cpu_from_evtchn(unsigned int evtchn);
84 static inline unsigned xen_evtchn_max_channels(void)
86 return evtchn_ops->max_channels();
90 * Do any ABI specific setup for a bound event channel before it can
91 * be unmasked and used.
93 static inline int xen_evtchn_port_setup(struct irq_info *info)
95 if (evtchn_ops->setup)
96 return evtchn_ops->setup(info);
100 static inline void xen_evtchn_port_bind_to_cpu(struct irq_info *info,
103 evtchn_ops->bind_to_cpu(info, cpu);
106 static inline void clear_evtchn(unsigned port)
108 evtchn_ops->clear_pending(port);
111 static inline void set_evtchn(unsigned port)
113 evtchn_ops->set_pending(port);
116 static inline bool test_evtchn(unsigned port)
118 return evtchn_ops->is_pending(port);
121 static inline bool test_and_set_mask(unsigned port)
123 return evtchn_ops->test_and_set_mask(port);
126 static inline void mask_evtchn(unsigned port)
128 return evtchn_ops->mask(port);
131 static inline void unmask_evtchn(unsigned port)
133 return evtchn_ops->unmask(port);
136 static inline void xen_evtchn_handle_events(unsigned cpu)
138 return evtchn_ops->handle_events(cpu);
141 static inline void xen_evtchn_resume(void)
143 if (evtchn_ops->resume)
144 evtchn_ops->resume();
147 void xen_evtchn_2l_init(void);
148 int xen_evtchn_fifo_init(void);
150 #endif /* #ifndef __EVENTS_INTERNAL_H__ */