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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 | 21 | |
be8d8537 | 22 | typedef ObjectClass IOThreadClass; |
be8d8537 SH |
23 | |
24 | #define IOTHREAD_GET_CLASS(obj) \ | |
25 | OBJECT_GET_CLASS(IOThreadClass, obj, TYPE_IOTHREAD) | |
26 | #define IOTHREAD_CLASS(klass) \ | |
27 | OBJECT_CLASS_CHECK(IOThreadClass, klass, TYPE_IOTHREAD) | |
28 | ||
29 | static void *iothread_run(void *opaque) | |
30 | { | |
31 | IOThread *iothread = opaque; | |
da5e1de9 | 32 | bool blocking; |
be8d8537 | 33 | |
88eb7c29 SH |
34 | qemu_mutex_lock(&iothread->init_done_lock); |
35 | iothread->thread_id = qemu_get_thread_id(); | |
36 | qemu_cond_signal(&iothread->init_done_cond); | |
37 | qemu_mutex_unlock(&iothread->init_done_lock); | |
38 | ||
da5e1de9 SH |
39 | while (!iothread->stopping) { |
40 | aio_context_acquire(iothread->ctx); | |
41 | blocking = true; | |
42 | while (!iothread->stopping && aio_poll(iothread->ctx, blocking)) { | |
43 | /* Progress was made, keep going */ | |
44 | blocking = false; | |
45 | } | |
46 | aio_context_release(iothread->ctx); | |
be8d8537 SH |
47 | } |
48 | return NULL; | |
49 | } | |
50 | ||
51 | static void iothread_instance_finalize(Object *obj) | |
52 | { | |
53 | IOThread *iothread = IOTHREAD(obj); | |
54 | ||
2f78e491 CN |
55 | if (!iothread->ctx) { |
56 | return; | |
57 | } | |
be8d8537 SH |
58 | iothread->stopping = true; |
59 | aio_notify(iothread->ctx); | |
60 | qemu_thread_join(&iothread->thread); | |
88eb7c29 SH |
61 | qemu_cond_destroy(&iothread->init_done_cond); |
62 | qemu_mutex_destroy(&iothread->init_done_lock); | |
be8d8537 SH |
63 | aio_context_unref(iothread->ctx); |
64 | } | |
65 | ||
66 | static void iothread_complete(UserCreatable *obj, Error **errp) | |
67 | { | |
2f78e491 | 68 | Error *local_error = NULL; |
be8d8537 SH |
69 | IOThread *iothread = IOTHREAD(obj); |
70 | ||
71 | iothread->stopping = false; | |
88eb7c29 | 72 | iothread->thread_id = -1; |
2f78e491 CN |
73 | iothread->ctx = aio_context_new(&local_error); |
74 | if (!iothread->ctx) { | |
75 | error_propagate(errp, local_error); | |
76 | return; | |
77 | } | |
88eb7c29 SH |
78 | |
79 | qemu_mutex_init(&iothread->init_done_lock); | |
80 | qemu_cond_init(&iothread->init_done_cond); | |
be8d8537 SH |
81 | |
82 | /* This assumes we are called from a thread with useful CPU affinity for us | |
83 | * to inherit. | |
84 | */ | |
85 | qemu_thread_create(&iothread->thread, "iothread", iothread_run, | |
86 | iothread, QEMU_THREAD_JOINABLE); | |
88eb7c29 SH |
87 | |
88 | /* Wait for initialization to complete */ | |
89 | qemu_mutex_lock(&iothread->init_done_lock); | |
90 | while (iothread->thread_id == -1) { | |
91 | qemu_cond_wait(&iothread->init_done_cond, | |
92 | &iothread->init_done_lock); | |
93 | } | |
94 | qemu_mutex_unlock(&iothread->init_done_lock); | |
be8d8537 SH |
95 | } |
96 | ||
97 | static void iothread_class_init(ObjectClass *klass, void *class_data) | |
98 | { | |
99 | UserCreatableClass *ucc = USER_CREATABLE_CLASS(klass); | |
100 | ucc->complete = iothread_complete; | |
101 | } | |
102 | ||
103 | static const TypeInfo iothread_info = { | |
104 | .name = TYPE_IOTHREAD, | |
105 | .parent = TYPE_OBJECT, | |
106 | .class_init = iothread_class_init, | |
107 | .instance_size = sizeof(IOThread), | |
108 | .instance_finalize = iothread_instance_finalize, | |
109 | .interfaces = (InterfaceInfo[]) { | |
110 | {TYPE_USER_CREATABLE}, | |
111 | {} | |
112 | }, | |
113 | }; | |
114 | ||
115 | static void iothread_register_types(void) | |
116 | { | |
117 | type_register_static(&iothread_info); | |
118 | } | |
119 | ||
120 | type_init(iothread_register_types) | |
121 | ||
be8d8537 SH |
122 | char *iothread_get_id(IOThread *iothread) |
123 | { | |
124 | return object_get_canonical_path_component(OBJECT(iothread)); | |
125 | } | |
126 | ||
127 | AioContext *iothread_get_aio_context(IOThread *iothread) | |
128 | { | |
129 | return iothread->ctx; | |
130 | } | |
dc3dd0d2 SH |
131 | |
132 | static int query_one_iothread(Object *object, void *opaque) | |
133 | { | |
134 | IOThreadInfoList ***prev = opaque; | |
135 | IOThreadInfoList *elem; | |
136 | IOThreadInfo *info; | |
137 | IOThread *iothread; | |
138 | ||
139 | iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD); | |
140 | if (!iothread) { | |
141 | return 0; | |
142 | } | |
143 | ||
144 | info = g_new0(IOThreadInfo, 1); | |
145 | info->id = iothread_get_id(iothread); | |
146 | info->thread_id = iothread->thread_id; | |
147 | ||
148 | elem = g_new0(IOThreadInfoList, 1); | |
149 | elem->value = info; | |
150 | elem->next = NULL; | |
151 | ||
152 | **prev = elem; | |
153 | *prev = &elem->next; | |
154 | return 0; | |
155 | } | |
156 | ||
157 | IOThreadInfoList *qmp_query_iothreads(Error **errp) | |
158 | { | |
159 | IOThreadInfoList *head = NULL; | |
160 | IOThreadInfoList **prev = &head; | |
bc2256c4 | 161 | Object *container = object_get_objects_root(); |
dc3dd0d2 SH |
162 | |
163 | object_child_foreach(container, query_one_iothread, &prev); | |
164 | return head; | |
165 | } |