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9a489f45 DV |
1 | /* |
2 | * Xen Event Channels (internal header) | |
3 | * | |
4 | * Copyright (C) 2013 Citrix Systems R&D Ltd. | |
5 | * | |
6 | * This source code is licensed under the GNU General Public License, | |
7 | * Version 2 or later. See the file COPYING for more details. | |
8 | */ | |
9 | #ifndef __EVENTS_INTERNAL_H__ | |
10 | #define __EVENTS_INTERNAL_H__ | |
11 | ||
12 | /* Interrupt types. */ | |
13 | enum xen_irq_type { | |
14 | IRQT_UNBOUND = 0, | |
15 | IRQT_PIRQ, | |
16 | IRQT_VIRQ, | |
17 | IRQT_IPI, | |
18 | IRQT_EVTCHN | |
19 | }; | |
20 | ||
21 | /* | |
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. | |
29 | * VIRQ - virq number | |
30 | * IPI - IPI vector | |
31 | * EVTCHN - | |
32 | */ | |
33 | struct irq_info { | |
34 | struct list_head list; | |
35 | int refcnt; | |
36 | enum xen_irq_type type; /* type */ | |
37 | unsigned irq; | |
d0b075ff | 38 | unsigned int evtchn; /* event channel */ |
9a489f45 DV |
39 | unsigned short cpu; /* cpu bound */ |
40 | ||
41 | union { | |
42 | unsigned short virq; | |
43 | enum ipi_vector ipi; | |
44 | struct { | |
45 | unsigned short pirq; | |
46 | unsigned short gsi; | |
47 | unsigned char vector; | |
48 | unsigned char flags; | |
49 | uint16_t domid; | |
50 | } pirq; | |
51 | } u; | |
52 | }; | |
53 | ||
54 | #define PIRQ_NEEDS_EOI (1 << 0) | |
55 | #define PIRQ_SHAREABLE (1 << 1) | |
4892c9b4 | 56 | #define PIRQ_MSI_GROUP (1 << 2) |
9a489f45 | 57 | |
ab9a1cca | 58 | struct evtchn_ops { |
d0b075ff DV |
59 | unsigned (*max_channels)(void); |
60 | unsigned (*nr_channels)(void); | |
61 | ||
08385875 | 62 | int (*setup)(struct irq_info *info); |
ab9a1cca DV |
63 | void (*bind_to_cpu)(struct irq_info *info, unsigned cpu); |
64 | ||
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 | ||
72 | void (*handle_events)(unsigned cpu); | |
1fe56551 | 73 | void (*resume)(void); |
ab9a1cca DV |
74 | }; |
75 | ||
76 | extern const struct evtchn_ops *evtchn_ops; | |
77 | ||
d0b075ff DV |
78 | extern int **evtchn_to_irq; |
79 | int get_evtchn_to_irq(unsigned int evtchn); | |
9a489f45 DV |
80 | |
81 | struct irq_info *info_for_irq(unsigned irq); | |
82 | unsigned cpu_from_irq(unsigned irq); | |
83 | unsigned cpu_from_evtchn(unsigned int evtchn); | |
84 | ||
d0b075ff DV |
85 | static inline unsigned xen_evtchn_max_channels(void) |
86 | { | |
87 | return evtchn_ops->max_channels(); | |
88 | } | |
89 | ||
08385875 DV |
90 | /* |
91 | * Do any ABI specific setup for a bound event channel before it can | |
92 | * be unmasked and used. | |
93 | */ | |
94 | static inline int xen_evtchn_port_setup(struct irq_info *info) | |
95 | { | |
96 | if (evtchn_ops->setup) | |
97 | return evtchn_ops->setup(info); | |
98 | return 0; | |
99 | } | |
100 | ||
ab9a1cca DV |
101 | static inline void xen_evtchn_port_bind_to_cpu(struct irq_info *info, |
102 | unsigned cpu) | |
103 | { | |
104 | evtchn_ops->bind_to_cpu(info, cpu); | |
105 | } | |
106 | ||
107 | static inline void clear_evtchn(unsigned port) | |
108 | { | |
109 | evtchn_ops->clear_pending(port); | |
110 | } | |
111 | ||
112 | static inline void set_evtchn(unsigned port) | |
113 | { | |
114 | evtchn_ops->set_pending(port); | |
115 | } | |
116 | ||
117 | static inline bool test_evtchn(unsigned port) | |
118 | { | |
119 | return evtchn_ops->is_pending(port); | |
120 | } | |
121 | ||
122 | static inline bool test_and_set_mask(unsigned port) | |
123 | { | |
124 | return evtchn_ops->test_and_set_mask(port); | |
125 | } | |
126 | ||
127 | static inline void mask_evtchn(unsigned port) | |
128 | { | |
129 | return evtchn_ops->mask(port); | |
130 | } | |
131 | ||
132 | static inline void unmask_evtchn(unsigned port) | |
133 | { | |
134 | return evtchn_ops->unmask(port); | |
135 | } | |
9a489f45 | 136 | |
ab9a1cca DV |
137 | static inline void xen_evtchn_handle_events(unsigned cpu) |
138 | { | |
139 | return evtchn_ops->handle_events(cpu); | |
140 | } | |
9a489f45 | 141 | |
1fe56551 DV |
142 | static inline void xen_evtchn_resume(void) |
143 | { | |
144 | if (evtchn_ops->resume) | |
145 | evtchn_ops->resume(); | |
146 | } | |
147 | ||
ab9a1cca | 148 | void xen_evtchn_2l_init(void); |
1fe56551 | 149 | int xen_evtchn_fifo_init(void); |
9a489f45 DV |
150 | |
151 | #endif /* #ifndef __EVENTS_INTERNAL_H__ */ |