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be8d8537 SH |
1 | /* |
2 | * Event loop thread | |
3 | * | |
4 | * Copyright Red Hat Inc., 2013 | |
5 | * | |
6 | * Authors: | |
7 | * Stefan Hajnoczi <stefanha@redhat.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
10 | * See the COPYING file in the top-level directory. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include "qom/object.h" | |
15 | #include "qom/object_interfaces.h" | |
16 | #include "qemu/module.h" | |
be8d8537 SH |
17 | #include "block/aio.h" |
18 | #include "sysemu/iothread.h" | |
dc3dd0d2 | 19 | #include "qmp-commands.h" |
2f78e491 | 20 | #include "qemu/error-report.h" |
be8d8537 SH |
21 | |
22 | #define IOTHREADS_PATH "/objects" | |
23 | ||
24 | typedef ObjectClass IOThreadClass; | |
be8d8537 SH |
25 | |
26 | #define IOTHREAD_GET_CLASS(obj) \ | |
27 | OBJECT_GET_CLASS(IOThreadClass, obj, TYPE_IOTHREAD) | |
28 | #define IOTHREAD_CLASS(klass) \ | |
29 | OBJECT_CLASS_CHECK(IOThreadClass, klass, TYPE_IOTHREAD) | |
30 | ||
31 | static void *iothread_run(void *opaque) | |
32 | { | |
33 | IOThread *iothread = opaque; | |
da5e1de9 | 34 | bool blocking; |
be8d8537 | 35 | |
88eb7c29 SH |
36 | qemu_mutex_lock(&iothread->init_done_lock); |
37 | iothread->thread_id = qemu_get_thread_id(); | |
38 | qemu_cond_signal(&iothread->init_done_cond); | |
39 | qemu_mutex_unlock(&iothread->init_done_lock); | |
40 | ||
da5e1de9 SH |
41 | while (!iothread->stopping) { |
42 | aio_context_acquire(iothread->ctx); | |
43 | blocking = true; | |
44 | while (!iothread->stopping && aio_poll(iothread->ctx, blocking)) { | |
45 | /* Progress was made, keep going */ | |
46 | blocking = false; | |
47 | } | |
48 | aio_context_release(iothread->ctx); | |
be8d8537 SH |
49 | } |
50 | return NULL; | |
51 | } | |
52 | ||
53 | static void iothread_instance_finalize(Object *obj) | |
54 | { | |
55 | IOThread *iothread = IOTHREAD(obj); | |
56 | ||
2f78e491 CN |
57 | if (!iothread->ctx) { |
58 | return; | |
59 | } | |
be8d8537 SH |
60 | iothread->stopping = true; |
61 | aio_notify(iothread->ctx); | |
62 | qemu_thread_join(&iothread->thread); | |
88eb7c29 SH |
63 | qemu_cond_destroy(&iothread->init_done_cond); |
64 | qemu_mutex_destroy(&iothread->init_done_lock); | |
be8d8537 SH |
65 | aio_context_unref(iothread->ctx); |
66 | } | |
67 | ||
68 | static void iothread_complete(UserCreatable *obj, Error **errp) | |
69 | { | |
2f78e491 | 70 | Error *local_error = NULL; |
be8d8537 SH |
71 | IOThread *iothread = IOTHREAD(obj); |
72 | ||
73 | iothread->stopping = false; | |
88eb7c29 | 74 | iothread->thread_id = -1; |
2f78e491 CN |
75 | iothread->ctx = aio_context_new(&local_error); |
76 | if (!iothread->ctx) { | |
77 | error_propagate(errp, local_error); | |
78 | return; | |
79 | } | |
88eb7c29 SH |
80 | |
81 | qemu_mutex_init(&iothread->init_done_lock); | |
82 | qemu_cond_init(&iothread->init_done_cond); | |
be8d8537 SH |
83 | |
84 | /* This assumes we are called from a thread with useful CPU affinity for us | |
85 | * to inherit. | |
86 | */ | |
87 | qemu_thread_create(&iothread->thread, "iothread", iothread_run, | |
88 | iothread, QEMU_THREAD_JOINABLE); | |
88eb7c29 SH |
89 | |
90 | /* Wait for initialization to complete */ | |
91 | qemu_mutex_lock(&iothread->init_done_lock); | |
92 | while (iothread->thread_id == -1) { | |
93 | qemu_cond_wait(&iothread->init_done_cond, | |
94 | &iothread->init_done_lock); | |
95 | } | |
96 | qemu_mutex_unlock(&iothread->init_done_lock); | |
be8d8537 SH |
97 | } |
98 | ||
99 | static void iothread_class_init(ObjectClass *klass, void *class_data) | |
100 | { | |
101 | UserCreatableClass *ucc = USER_CREATABLE_CLASS(klass); | |
102 | ucc->complete = iothread_complete; | |
103 | } | |
104 | ||
105 | static const TypeInfo iothread_info = { | |
106 | .name = TYPE_IOTHREAD, | |
107 | .parent = TYPE_OBJECT, | |
108 | .class_init = iothread_class_init, | |
109 | .instance_size = sizeof(IOThread), | |
110 | .instance_finalize = iothread_instance_finalize, | |
111 | .interfaces = (InterfaceInfo[]) { | |
112 | {TYPE_USER_CREATABLE}, | |
113 | {} | |
114 | }, | |
115 | }; | |
116 | ||
117 | static void iothread_register_types(void) | |
118 | { | |
119 | type_register_static(&iothread_info); | |
120 | } | |
121 | ||
122 | type_init(iothread_register_types) | |
123 | ||
be8d8537 SH |
124 | char *iothread_get_id(IOThread *iothread) |
125 | { | |
126 | return object_get_canonical_path_component(OBJECT(iothread)); | |
127 | } | |
128 | ||
129 | AioContext *iothread_get_aio_context(IOThread *iothread) | |
130 | { | |
131 | return iothread->ctx; | |
132 | } | |
dc3dd0d2 SH |
133 | |
134 | static int query_one_iothread(Object *object, void *opaque) | |
135 | { | |
136 | IOThreadInfoList ***prev = opaque; | |
137 | IOThreadInfoList *elem; | |
138 | IOThreadInfo *info; | |
139 | IOThread *iothread; | |
140 | ||
141 | iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD); | |
142 | if (!iothread) { | |
143 | return 0; | |
144 | } | |
145 | ||
146 | info = g_new0(IOThreadInfo, 1); | |
147 | info->id = iothread_get_id(iothread); | |
148 | info->thread_id = iothread->thread_id; | |
149 | ||
150 | elem = g_new0(IOThreadInfoList, 1); | |
151 | elem->value = info; | |
152 | elem->next = NULL; | |
153 | ||
154 | **prev = elem; | |
155 | *prev = &elem->next; | |
156 | return 0; | |
157 | } | |
158 | ||
159 | IOThreadInfoList *qmp_query_iothreads(Error **errp) | |
160 | { | |
161 | IOThreadInfoList *head = NULL; | |
162 | IOThreadInfoList **prev = &head; | |
163 | Object *container = container_get(object_get_root(), IOTHREADS_PATH); | |
164 | ||
165 | object_child_foreach(container, query_one_iothread, &prev); | |
166 | return head; | |
167 | } |