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)
56 #define PIRQ_MSI_GROUP (1 << 2)
59 unsigned (*max_channels)(void);
60 unsigned (*nr_channels)(void);
62 int (*setup)(struct irq_info *info);
63 void (*bind_to_cpu)(struct irq_info *info, unsigned cpu);
65 void (*clear_pending)(unsigned port);
66 void (*set_pending)(unsigned port);
67 bool (*is_pending)(unsigned port);
68 bool (*test_and_set_mask)(unsigned port);
69 void (*mask)(unsigned port);
70 void (*unmask)(unsigned port);
71 void (*close)(unsigned port, unsigned cpu);
73 void (*handle_events)(unsigned cpu);
77 extern const struct evtchn_ops *evtchn_ops;
79 extern int **evtchn_to_irq;
80 int get_evtchn_to_irq(unsigned int evtchn);
82 struct irq_info *info_for_irq(unsigned irq);
83 unsigned cpu_from_irq(unsigned irq);
84 unsigned cpu_from_evtchn(unsigned int evtchn);
86 static inline unsigned xen_evtchn_max_channels(void)
88 return evtchn_ops->max_channels();
92 * Do any ABI specific setup for a bound event channel before it can
93 * be unmasked and used.
95 static inline int xen_evtchn_port_setup(struct irq_info *info)
97 if (evtchn_ops->setup)
98 return evtchn_ops->setup(info);
102 static inline void xen_evtchn_port_bind_to_cpu(struct irq_info *info,
105 evtchn_ops->bind_to_cpu(info, cpu);
108 static inline void clear_evtchn(unsigned port)
110 evtchn_ops->clear_pending(port);
113 static inline void set_evtchn(unsigned port)
115 evtchn_ops->set_pending(port);
118 static inline bool test_evtchn(unsigned port)
120 return evtchn_ops->is_pending(port);
123 static inline bool test_and_set_mask(unsigned port)
125 return evtchn_ops->test_and_set_mask(port);
128 static inline void mask_evtchn(unsigned port)
130 return evtchn_ops->mask(port);
133 static inline void unmask_evtchn(unsigned port)
135 return evtchn_ops->unmask(port);
138 static inline void xen_evtchn_handle_events(unsigned cpu)
140 return evtchn_ops->handle_events(cpu);
143 static inline void xen_evtchn_resume(void)
145 if (evtchn_ops->resume)
146 evtchn_ops->resume();
149 static inline void xen_evtchn_op_close(unsigned port, unsigned cpu)
151 if (evtchn_ops->close)
152 return evtchn_ops->close(port, cpu);
155 void xen_evtchn_2l_init(void);
156 int xen_evtchn_fifo_init(void);
158 #endif /* #ifndef __EVENTS_INTERNAL_H__ */