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Stefan Hajnoczibe8d8532014-03-03 11:30:05 +01001/*
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
Peter Maydelld38ea872016-01-29 17:50:05 +000014#include "qemu/osdep.h"
Stefan Hajnoczibe8d8532014-03-03 11:30:05 +010015#include "qom/object.h"
16#include "qom/object_interfaces.h"
17#include "qemu/module.h"
Stefan Hajnoczibe8d8532014-03-03 11:30:05 +010018#include "block/aio.h"
19#include "sysemu/iothread.h"
Stefan Hajnoczidc3dd0d2014-02-27 11:48:42 +010020#include "qmp-commands.h"
Chrysostomos Nanakos2f78e492014-09-18 14:30:49 +030021#include "qemu/error-report.h"
Paolo Bonziniab28bd22015-07-09 08:55:38 +020022#include "qemu/rcu.h"
Stefan Hajnoczibe8d8532014-03-03 11:30:05 +010023
Stefan Hajnoczibe8d8532014-03-03 11:30:05 +010024typedef ObjectClass IOThreadClass;
Stefan Hajnoczibe8d8532014-03-03 11:30:05 +010025
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
31static void *iothread_run(void *opaque)
32{
33 IOThread *iothread = opaque;
Stefan Hajnoczida5e1de2015-06-03 10:15:33 +010034 bool blocking;
Stefan Hajnoczibe8d8532014-03-03 11:30:05 +010035
Paolo Bonziniab28bd22015-07-09 08:55:38 +020036 rcu_register_thread();
37
Stefan Hajnoczi88eb7c22014-02-27 11:48:41 +010038 qemu_mutex_lock(&iothread->init_done_lock);
39 iothread->thread_id = qemu_get_thread_id();
40 qemu_cond_signal(&iothread->init_done_cond);
41 qemu_mutex_unlock(&iothread->init_done_lock);
42
Stefan Hajnoczida5e1de2015-06-03 10:15:33 +010043 while (!iothread->stopping) {
44 aio_context_acquire(iothread->ctx);
45 blocking = true;
46 while (!iothread->stopping && aio_poll(iothread->ctx, blocking)) {
47 /* Progress was made, keep going */
48 blocking = false;
49 }
50 aio_context_release(iothread->ctx);
Stefan Hajnoczibe8d8532014-03-03 11:30:05 +010051 }
Paolo Bonziniab28bd22015-07-09 08:55:38 +020052
53 rcu_unregister_thread();
Stefan Hajnoczibe8d8532014-03-03 11:30:05 +010054 return NULL;
55}
56
Fam Zhengdce89212016-09-08 17:28:51 +080057static int iothread_stop(Object *object, void *opaque)
Stefan Hajnoczibe8d8532014-03-03 11:30:05 +010058{
Fam Zhengdce89212016-09-08 17:28:51 +080059 IOThread *iothread;
Stefan Hajnoczibe8d8532014-03-03 11:30:05 +010060
Fam Zhengdce89212016-09-08 17:28:51 +080061 iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD);
62 if (!iothread || !iothread->ctx) {
63 return 0;
Chrysostomos Nanakos2f78e492014-09-18 14:30:49 +030064 }
Stefan Hajnoczibe8d8532014-03-03 11:30:05 +010065 iothread->stopping = true;
66 aio_notify(iothread->ctx);
67 qemu_thread_join(&iothread->thread);
Fam Zhengdce89212016-09-08 17:28:51 +080068 return 0;
69}
70
71static void iothread_instance_finalize(Object *obj)
72{
73 IOThread *iothread = IOTHREAD(obj);
74
75 iothread_stop(obj, NULL);
Stefan Hajnoczi88eb7c22014-02-27 11:48:41 +010076 qemu_cond_destroy(&iothread->init_done_cond);
77 qemu_mutex_destroy(&iothread->init_done_lock);
Stefan Hajnoczibe8d8532014-03-03 11:30:05 +010078 aio_context_unref(iothread->ctx);
79}
80
81static void iothread_complete(UserCreatable *obj, Error **errp)
82{
Chrysostomos Nanakos2f78e492014-09-18 14:30:49 +030083 Error *local_error = NULL;
Stefan Hajnoczibe8d8532014-03-03 11:30:05 +010084 IOThread *iothread = IOTHREAD(obj);
Paolo Bonzinid21e8772015-11-24 14:46:44 +010085 char *name, *thread_name;
Stefan Hajnoczibe8d8532014-03-03 11:30:05 +010086
87 iothread->stopping = false;
Stefan Hajnoczi88eb7c22014-02-27 11:48:41 +010088 iothread->thread_id = -1;
Chrysostomos Nanakos2f78e492014-09-18 14:30:49 +030089 iothread->ctx = aio_context_new(&local_error);
90 if (!iothread->ctx) {
91 error_propagate(errp, local_error);
92 return;
93 }
Stefan Hajnoczi88eb7c22014-02-27 11:48:41 +010094
95 qemu_mutex_init(&iothread->init_done_lock);
96 qemu_cond_init(&iothread->init_done_cond);
Stefan Hajnoczibe8d8532014-03-03 11:30:05 +010097
98 /* This assumes we are called from a thread with useful CPU affinity for us
99 * to inherit.
100 */
Paolo Bonzinid21e8772015-11-24 14:46:44 +0100101 name = object_get_canonical_path_component(OBJECT(obj));
102 thread_name = g_strdup_printf("IO %s", name);
103 qemu_thread_create(&iothread->thread, thread_name, iothread_run,
Stefan Hajnoczibe8d8532014-03-03 11:30:05 +0100104 iothread, QEMU_THREAD_JOINABLE);
Paolo Bonzinid21e8772015-11-24 14:46:44 +0100105 g_free(thread_name);
106 g_free(name);
Stefan Hajnoczi88eb7c22014-02-27 11:48:41 +0100107
108 /* Wait for initialization to complete */
109 qemu_mutex_lock(&iothread->init_done_lock);
110 while (iothread->thread_id == -1) {
111 qemu_cond_wait(&iothread->init_done_cond,
112 &iothread->init_done_lock);
113 }
114 qemu_mutex_unlock(&iothread->init_done_lock);
Stefan Hajnoczibe8d8532014-03-03 11:30:05 +0100115}
116
117static void iothread_class_init(ObjectClass *klass, void *class_data)
118{
119 UserCreatableClass *ucc = USER_CREATABLE_CLASS(klass);
120 ucc->complete = iothread_complete;
121}
122
123static const TypeInfo iothread_info = {
124 .name = TYPE_IOTHREAD,
125 .parent = TYPE_OBJECT,
126 .class_init = iothread_class_init,
127 .instance_size = sizeof(IOThread),
128 .instance_finalize = iothread_instance_finalize,
129 .interfaces = (InterfaceInfo[]) {
130 {TYPE_USER_CREATABLE},
131 {}
132 },
133};
134
135static void iothread_register_types(void)
136{
137 type_register_static(&iothread_info);
138}
139
140type_init(iothread_register_types)
141
Stefan Hajnoczibe8d8532014-03-03 11:30:05 +0100142char *iothread_get_id(IOThread *iothread)
143{
144 return object_get_canonical_path_component(OBJECT(iothread));
145}
146
147AioContext *iothread_get_aio_context(IOThread *iothread)
148{
149 return iothread->ctx;
150}
Stefan Hajnoczidc3dd0d2014-02-27 11:48:42 +0100151
152static int query_one_iothread(Object *object, void *opaque)
153{
154 IOThreadInfoList ***prev = opaque;
155 IOThreadInfoList *elem;
156 IOThreadInfo *info;
157 IOThread *iothread;
158
159 iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD);
160 if (!iothread) {
161 return 0;
162 }
163
164 info = g_new0(IOThreadInfo, 1);
165 info->id = iothread_get_id(iothread);
166 info->thread_id = iothread->thread_id;
167
168 elem = g_new0(IOThreadInfoList, 1);
169 elem->value = info;
170 elem->next = NULL;
171
172 **prev = elem;
173 *prev = &elem->next;
174 return 0;
175}
176
177IOThreadInfoList *qmp_query_iothreads(Error **errp)
178{
179 IOThreadInfoList *head = NULL;
180 IOThreadInfoList **prev = &head;
Daniel P. Berrangebc2256c2015-05-13 17:14:05 +0100181 Object *container = object_get_objects_root();
Stefan Hajnoczidc3dd0d2014-02-27 11:48:42 +0100182
183 object_child_foreach(container, query_one_iothread, &prev);
184 return head;
185}
Fam Zhengdce89212016-09-08 17:28:51 +0800186
187void iothread_stop_all(void)
188{
189 Object *container = object_get_objects_root();
190
191 object_child_foreach(container, iothread_stop, NULL);
192}