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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; | |
38 | unsigned short evtchn; /* event channel */ | |
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) | |
56 | ||
57 | extern int *evtchn_to_irq; | |
58 | ||
59 | struct irq_info *info_for_irq(unsigned irq); | |
60 | unsigned cpu_from_irq(unsigned irq); | |
61 | unsigned cpu_from_evtchn(unsigned int evtchn); | |
62 | ||
63 | void xen_evtchn_port_bind_to_cpu(struct irq_info *info, int cpu); | |
64 | ||
65 | void clear_evtchn(int port); | |
66 | void set_evtchn(int port); | |
67 | int test_evtchn(int port); | |
68 | int test_and_set_mask(int port); | |
69 | void mask_evtchn(int port); | |
70 | void unmask_evtchn(int port); | |
71 | ||
72 | void xen_evtchn_handle_events(int cpu); | |
73 | ||
74 | #endif /* #ifndef __EVENTS_INTERNAL_H__ */ |