Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Event loop thread |
| 3 | * |
Eric Blake | c3033fd | 2021-01-13 16:10:12 -0600 | [diff] [blame] | 4 | * Copyright Red Hat Inc., 2013, 2020 |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 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 Maydell | d38ea87 | 2016-01-29 17:50:05 +0000 | [diff] [blame] | 14 | #include "qemu/osdep.h" |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 15 | #include "qom/object.h" |
| 16 | #include "qom/object_interfaces.h" |
| 17 | #include "qemu/module.h" |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 18 | #include "block/aio.h" |
Paolo Bonzini | d16341f | 2016-10-27 12:49:00 +0200 | [diff] [blame] | 19 | #include "block/block.h" |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 20 | #include "sysemu/iothread.h" |
Markus Armbruster | e688df6 | 2018-02-01 12:18:31 +0100 | [diff] [blame] | 21 | #include "qapi/error.h" |
Markus Armbruster | 112ed24 | 2018-02-26 17:13:27 -0600 | [diff] [blame] | 22 | #include "qapi/qapi-commands-misc.h" |
Chrysostomos Nanakos | 2f78e49 | 2014-09-18 14:30:49 +0300 | [diff] [blame] | 23 | #include "qemu/error-report.h" |
Paolo Bonzini | ab28bd2 | 2015-07-09 08:55:38 +0200 | [diff] [blame] | 24 | #include "qemu/rcu.h" |
Paolo Bonzini | e437016 | 2016-10-27 12:48:59 +0200 | [diff] [blame] | 25 | #include "qemu/main-loop.h" |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 26 | |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 27 | typedef ObjectClass IOThreadClass; |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 28 | |
Eduardo Habkost | 8110fa1 | 2020-08-31 17:07:33 -0400 | [diff] [blame] | 29 | DECLARE_CLASS_CHECKERS(IOThreadClass, IOTHREAD, |
| 30 | TYPE_IOTHREAD) |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 31 | |
Peter Xu | 90c558b | 2018-03-22 16:56:30 +0800 | [diff] [blame] | 32 | #ifdef CONFIG_POSIX |
Stefan Hajnoczi | cdd7abf | 2017-01-26 17:01:19 +0000 | [diff] [blame] | 33 | /* Benchmark results from 2016 on NVMe SSD drives show max polling times around |
| 34 | * 16-32 microseconds yield IOPS improvements for both iodepth=1 and iodepth=32 |
| 35 | * workloads. |
| 36 | */ |
| 37 | #define IOTHREAD_POLL_MAX_NS_DEFAULT 32768ULL |
Peter Xu | 90c558b | 2018-03-22 16:56:30 +0800 | [diff] [blame] | 38 | #else |
| 39 | #define IOTHREAD_POLL_MAX_NS_DEFAULT 0ULL |
| 40 | #endif |
Stefan Hajnoczi | cdd7abf | 2017-01-26 17:01:19 +0000 | [diff] [blame] | 41 | |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 42 | static void *iothread_run(void *opaque) |
| 43 | { |
| 44 | IOThread *iothread = opaque; |
| 45 | |
Paolo Bonzini | ab28bd2 | 2015-07-09 08:55:38 +0200 | [diff] [blame] | 46 | rcu_register_thread(); |
Peter Xu | b60ec76 | 2019-03-06 19:55:31 +0800 | [diff] [blame] | 47 | /* |
| 48 | * g_main_context_push_thread_default() must be called before anything |
| 49 | * in this new thread uses glib. |
| 50 | */ |
| 51 | g_main_context_push_thread_default(iothread->worker_context); |
Paolo Bonzini | 5f50be9 | 2021-06-09 14:22:34 +0200 | [diff] [blame] | 52 | qemu_set_current_aio_context(iothread->ctx); |
Stefan Hajnoczi | 88eb7c2 | 2014-02-27 11:48:41 +0100 | [diff] [blame] | 53 | iothread->thread_id = qemu_get_thread_id(); |
Peter Xu | 21c4d15 | 2019-03-06 19:55:28 +0800 | [diff] [blame] | 54 | qemu_sem_post(&iothread->init_done_sem); |
Stefan Hajnoczi | 88eb7c2 | 2014-02-27 11:48:41 +0100 | [diff] [blame] | 55 | |
Stefan Hajnoczi | 2362a28 | 2017-12-07 20:13:19 +0000 | [diff] [blame] | 56 | while (iothread->running) { |
Peter Xu | 6ca2062 | 2019-03-06 19:55:32 +0800 | [diff] [blame] | 57 | /* |
| 58 | * Note: from functional-wise the g_main_loop_run() below can |
| 59 | * already cover the aio_poll() events, but we can't run the |
| 60 | * main loop unconditionally because explicit aio_poll() here |
| 61 | * is faster than g_main_loop_run() when we do not need the |
| 62 | * gcontext at all (e.g., pure block layer iothreads). In |
| 63 | * other words, when we want to run the gcontext with the |
| 64 | * iothread we need to pay some performance for functionality. |
| 65 | */ |
Paolo Bonzini | 65c1b5b | 2016-10-27 12:49:06 +0200 | [diff] [blame] | 66 | aio_poll(iothread->ctx, true); |
Wang Yong | 329163c | 2017-08-29 15:22:37 +0800 | [diff] [blame] | 67 | |
Peter Xu | 6c95363 | 2019-01-29 13:14:32 +0800 | [diff] [blame] | 68 | /* |
| 69 | * We must check the running state again in case it was |
| 70 | * changed in previous aio_poll() |
| 71 | */ |
Stefan Hajnoczi | d73415a | 2020-09-23 11:56:46 +0100 | [diff] [blame] | 72 | if (iothread->running && qatomic_read(&iothread->run_gcontext)) { |
Wang Yong | 329163c | 2017-08-29 15:22:37 +0800 | [diff] [blame] | 73 | g_main_loop_run(iothread->main_loop); |
Wang Yong | 329163c | 2017-08-29 15:22:37 +0800 | [diff] [blame] | 74 | } |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 75 | } |
Paolo Bonzini | ab28bd2 | 2015-07-09 08:55:38 +0200 | [diff] [blame] | 76 | |
Peter Xu | b60ec76 | 2019-03-06 19:55:31 +0800 | [diff] [blame] | 77 | g_main_context_pop_thread_default(iothread->worker_context); |
Paolo Bonzini | ab28bd2 | 2015-07-09 08:55:38 +0200 | [diff] [blame] | 78 | rcu_unregister_thread(); |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 79 | return NULL; |
| 80 | } |
| 81 | |
Stefan Hajnoczi | 2362a28 | 2017-12-07 20:13:19 +0000 | [diff] [blame] | 82 | /* Runs in iothread_run() thread */ |
| 83 | static void iothread_stop_bh(void *opaque) |
| 84 | { |
| 85 | IOThread *iothread = opaque; |
| 86 | |
| 87 | iothread->running = false; /* stop iothread_run() */ |
| 88 | |
| 89 | if (iothread->main_loop) { |
| 90 | g_main_loop_quit(iothread->main_loop); |
| 91 | } |
| 92 | } |
| 93 | |
Peter Xu | 82d9070 | 2017-09-28 10:59:56 +0800 | [diff] [blame] | 94 | void iothread_stop(IOThread *iothread) |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 95 | { |
Peter Xu | 82d9070 | 2017-09-28 10:59:56 +0800 | [diff] [blame] | 96 | if (!iothread->ctx || iothread->stopping) { |
| 97 | return; |
Chrysostomos Nanakos | 2f78e49 | 2014-09-18 14:30:49 +0300 | [diff] [blame] | 98 | } |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 99 | iothread->stopping = true; |
Stefan Hajnoczi | 2362a28 | 2017-12-07 20:13:19 +0000 | [diff] [blame] | 100 | aio_bh_schedule_oneshot(iothread->ctx, iothread_stop_bh, iothread); |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 101 | qemu_thread_join(&iothread->thread); |
Peter Xu | 82d9070 | 2017-09-28 10:59:56 +0800 | [diff] [blame] | 102 | } |
| 103 | |
Stefan Hajnoczi | cdd7abf | 2017-01-26 17:01:19 +0000 | [diff] [blame] | 104 | static void iothread_instance_init(Object *obj) |
| 105 | { |
| 106 | IOThread *iothread = IOTHREAD(obj); |
| 107 | |
| 108 | iothread->poll_max_ns = IOTHREAD_POLL_MAX_NS_DEFAULT; |
Marc-André Lureau | 14a2d11 | 2018-08-21 12:07:16 +0200 | [diff] [blame] | 109 | iothread->thread_id = -1; |
Peter Xu | 21c4d15 | 2019-03-06 19:55:28 +0800 | [diff] [blame] | 110 | qemu_sem_init(&iothread->init_done_sem, 0); |
Peter Xu | b506e0f | 2019-03-06 19:55:29 +0800 | [diff] [blame] | 111 | /* By default, we don't run gcontext */ |
Stefan Hajnoczi | d73415a | 2020-09-23 11:56:46 +0100 | [diff] [blame] | 112 | qatomic_set(&iothread->run_gcontext, 0); |
Stefan Hajnoczi | cdd7abf | 2017-01-26 17:01:19 +0000 | [diff] [blame] | 113 | } |
| 114 | |
Fam Zheng | dce8921 | 2016-09-08 17:28:51 +0800 | [diff] [blame] | 115 | static void iothread_instance_finalize(Object *obj) |
| 116 | { |
| 117 | IOThread *iothread = IOTHREAD(obj); |
| 118 | |
Peter Xu | 82d9070 | 2017-09-28 10:59:56 +0800 | [diff] [blame] | 119 | iothread_stop(iothread); |
Marc-André Lureau | 14a2d11 | 2018-08-21 12:07:16 +0200 | [diff] [blame] | 120 | |
Peter Xu | 1554434 | 2018-04-09 16:39:56 +0800 | [diff] [blame] | 121 | /* |
| 122 | * Before glib2 2.33.10, there is a glib2 bug that GSource context |
| 123 | * pointer may not be cleared even if the context has already been |
| 124 | * destroyed (while it should). Here let's free the AIO context |
| 125 | * earlier to bypass that glib bug. |
| 126 | * |
| 127 | * We can remove this comment after the minimum supported glib2 |
| 128 | * version boosts to 2.33.10. Before that, let's free the |
| 129 | * GSources first before destroying any GMainContext. |
| 130 | */ |
| 131 | if (iothread->ctx) { |
| 132 | aio_context_unref(iothread->ctx); |
| 133 | iothread->ctx = NULL; |
| 134 | } |
Peter Xu | 5b3ac23 | 2017-09-28 10:59:57 +0800 | [diff] [blame] | 135 | if (iothread->worker_context) { |
| 136 | g_main_context_unref(iothread->worker_context); |
| 137 | iothread->worker_context = NULL; |
Peter Xu | 0bd2d23 | 2019-03-06 19:55:30 +0800 | [diff] [blame] | 138 | g_main_loop_unref(iothread->main_loop); |
| 139 | iothread->main_loop = NULL; |
Peter Xu | 5b3ac23 | 2017-09-28 10:59:57 +0800 | [diff] [blame] | 140 | } |
Peter Xu | 21c4d15 | 2019-03-06 19:55:28 +0800 | [diff] [blame] | 141 | qemu_sem_destroy(&iothread->init_done_sem); |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 142 | } |
| 143 | |
Peter Xu | b506e0f | 2019-03-06 19:55:29 +0800 | [diff] [blame] | 144 | static void iothread_init_gcontext(IOThread *iothread) |
| 145 | { |
| 146 | GSource *source; |
| 147 | |
| 148 | iothread->worker_context = g_main_context_new(); |
| 149 | source = aio_get_g_source(iothread_get_aio_context(iothread)); |
| 150 | g_source_attach(source, iothread->worker_context); |
| 151 | g_source_unref(source); |
Peter Xu | 0bd2d23 | 2019-03-06 19:55:30 +0800 | [diff] [blame] | 152 | iothread->main_loop = g_main_loop_new(iothread->worker_context, TRUE); |
Peter Xu | b506e0f | 2019-03-06 19:55:29 +0800 | [diff] [blame] | 153 | } |
| 154 | |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 155 | static void iothread_complete(UserCreatable *obj, Error **errp) |
| 156 | { |
Chrysostomos Nanakos | 2f78e49 | 2014-09-18 14:30:49 +0300 | [diff] [blame] | 157 | Error *local_error = NULL; |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 158 | IOThread *iothread = IOTHREAD(obj); |
Markus Armbruster | 7a309cc | 2020-07-14 18:02:00 +0200 | [diff] [blame] | 159 | char *thread_name; |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 160 | |
| 161 | iothread->stopping = false; |
Stefan Hajnoczi | 2362a28 | 2017-12-07 20:13:19 +0000 | [diff] [blame] | 162 | iothread->running = true; |
Markus Armbruster | 668f62e | 2020-07-07 18:06:02 +0200 | [diff] [blame] | 163 | iothread->ctx = aio_context_new(errp); |
Chrysostomos Nanakos | 2f78e49 | 2014-09-18 14:30:49 +0300 | [diff] [blame] | 164 | if (!iothread->ctx) { |
Chrysostomos Nanakos | 2f78e49 | 2014-09-18 14:30:49 +0300 | [diff] [blame] | 165 | return; |
| 166 | } |
Stefan Hajnoczi | 88eb7c2 | 2014-02-27 11:48:41 +0100 | [diff] [blame] | 167 | |
Peter Xu | b506e0f | 2019-03-06 19:55:29 +0800 | [diff] [blame] | 168 | /* |
| 169 | * Init one GMainContext for the iothread unconditionally, even if |
| 170 | * it's not used |
| 171 | */ |
| 172 | iothread_init_gcontext(iothread); |
| 173 | |
Stefan Hajnoczi | 5e5db49 | 2016-12-01 19:26:52 +0000 | [diff] [blame] | 174 | aio_context_set_poll_params(iothread->ctx, |
| 175 | iothread->poll_max_ns, |
| 176 | iothread->poll_grow, |
| 177 | iothread->poll_shrink, |
Stefan Hajnoczi | 0d9d86f | 2016-12-01 19:26:45 +0000 | [diff] [blame] | 178 | &local_error); |
| 179 | if (local_error) { |
| 180 | error_propagate(errp, local_error); |
| 181 | aio_context_unref(iothread->ctx); |
| 182 | iothread->ctx = NULL; |
| 183 | return; |
| 184 | } |
| 185 | |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 186 | /* This assumes we are called from a thread with useful CPU affinity for us |
| 187 | * to inherit. |
| 188 | */ |
Markus Armbruster | 7a309cc | 2020-07-14 18:02:00 +0200 | [diff] [blame] | 189 | thread_name = g_strdup_printf("IO %s", |
| 190 | object_get_canonical_path_component(OBJECT(obj))); |
Paolo Bonzini | d21e877 | 2015-11-24 14:46:44 +0100 | [diff] [blame] | 191 | qemu_thread_create(&iothread->thread, thread_name, iothread_run, |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 192 | iothread, QEMU_THREAD_JOINABLE); |
Paolo Bonzini | d21e877 | 2015-11-24 14:46:44 +0100 | [diff] [blame] | 193 | g_free(thread_name); |
Stefan Hajnoczi | 88eb7c2 | 2014-02-27 11:48:41 +0100 | [diff] [blame] | 194 | |
| 195 | /* Wait for initialization to complete */ |
Stefan Hajnoczi | 88eb7c2 | 2014-02-27 11:48:41 +0100 | [diff] [blame] | 196 | while (iothread->thread_id == -1) { |
Peter Xu | 21c4d15 | 2019-03-06 19:55:28 +0800 | [diff] [blame] | 197 | qemu_sem_wait(&iothread->init_done_sem); |
Stefan Hajnoczi | 88eb7c2 | 2014-02-27 11:48:41 +0100 | [diff] [blame] | 198 | } |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 199 | } |
| 200 | |
Stefan Hajnoczi | 5e5db49 | 2016-12-01 19:26:52 +0000 | [diff] [blame] | 201 | typedef struct { |
| 202 | const char *name; |
| 203 | ptrdiff_t offset; /* field's byte offset in IOThread struct */ |
| 204 | } PollParamInfo; |
| 205 | |
| 206 | static PollParamInfo poll_max_ns_info = { |
| 207 | "poll-max-ns", offsetof(IOThread, poll_max_ns), |
| 208 | }; |
| 209 | static PollParamInfo poll_grow_info = { |
| 210 | "poll-grow", offsetof(IOThread, poll_grow), |
| 211 | }; |
| 212 | static PollParamInfo poll_shrink_info = { |
| 213 | "poll-shrink", offsetof(IOThread, poll_shrink), |
| 214 | }; |
| 215 | |
| 216 | static void iothread_get_poll_param(Object *obj, Visitor *v, |
Stefan Hajnoczi | 0d9d86f | 2016-12-01 19:26:45 +0000 | [diff] [blame] | 217 | const char *name, void *opaque, Error **errp) |
| 218 | { |
| 219 | IOThread *iothread = IOTHREAD(obj); |
Stefan Hajnoczi | 5e5db49 | 2016-12-01 19:26:52 +0000 | [diff] [blame] | 220 | PollParamInfo *info = opaque; |
| 221 | int64_t *field = (void *)iothread + info->offset; |
Stefan Hajnoczi | 0d9d86f | 2016-12-01 19:26:45 +0000 | [diff] [blame] | 222 | |
Stefan Hajnoczi | 5e5db49 | 2016-12-01 19:26:52 +0000 | [diff] [blame] | 223 | visit_type_int64(v, name, field, errp); |
Stefan Hajnoczi | 0d9d86f | 2016-12-01 19:26:45 +0000 | [diff] [blame] | 224 | } |
| 225 | |
Stefan Hajnoczi | 5e5db49 | 2016-12-01 19:26:52 +0000 | [diff] [blame] | 226 | static void iothread_set_poll_param(Object *obj, Visitor *v, |
Stefan Hajnoczi | 0d9d86f | 2016-12-01 19:26:45 +0000 | [diff] [blame] | 227 | const char *name, void *opaque, Error **errp) |
| 228 | { |
| 229 | IOThread *iothread = IOTHREAD(obj); |
Stefan Hajnoczi | 5e5db49 | 2016-12-01 19:26:52 +0000 | [diff] [blame] | 230 | PollParamInfo *info = opaque; |
| 231 | int64_t *field = (void *)iothread + info->offset; |
Stefan Hajnoczi | 0d9d86f | 2016-12-01 19:26:45 +0000 | [diff] [blame] | 232 | int64_t value; |
| 233 | |
Markus Armbruster | 668f62e | 2020-07-07 18:06:02 +0200 | [diff] [blame] | 234 | if (!visit_type_int64(v, name, &value, errp)) { |
Markus Armbruster | dcfe480 | 2020-07-07 18:06:01 +0200 | [diff] [blame] | 235 | return; |
Stefan Hajnoczi | 0d9d86f | 2016-12-01 19:26:45 +0000 | [diff] [blame] | 236 | } |
| 237 | |
| 238 | if (value < 0) { |
Markus Armbruster | dcfe480 | 2020-07-07 18:06:01 +0200 | [diff] [blame] | 239 | error_setg(errp, "%s value must be in range [0, %" PRId64 "]", |
Stefan Hajnoczi | 5e5db49 | 2016-12-01 19:26:52 +0000 | [diff] [blame] | 240 | info->name, INT64_MAX); |
Markus Armbruster | dcfe480 | 2020-07-07 18:06:01 +0200 | [diff] [blame] | 241 | return; |
Stefan Hajnoczi | 0d9d86f | 2016-12-01 19:26:45 +0000 | [diff] [blame] | 242 | } |
| 243 | |
Stefan Hajnoczi | 5e5db49 | 2016-12-01 19:26:52 +0000 | [diff] [blame] | 244 | *field = value; |
Stefan Hajnoczi | 0d9d86f | 2016-12-01 19:26:45 +0000 | [diff] [blame] | 245 | |
| 246 | if (iothread->ctx) { |
Stefan Hajnoczi | 5e5db49 | 2016-12-01 19:26:52 +0000 | [diff] [blame] | 247 | aio_context_set_poll_params(iothread->ctx, |
| 248 | iothread->poll_max_ns, |
| 249 | iothread->poll_grow, |
| 250 | iothread->poll_shrink, |
Markus Armbruster | dcfe480 | 2020-07-07 18:06:01 +0200 | [diff] [blame] | 251 | errp); |
Stefan Hajnoczi | 0d9d86f | 2016-12-01 19:26:45 +0000 | [diff] [blame] | 252 | } |
Stefan Hajnoczi | 0d9d86f | 2016-12-01 19:26:45 +0000 | [diff] [blame] | 253 | } |
| 254 | |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 255 | static void iothread_class_init(ObjectClass *klass, void *class_data) |
| 256 | { |
| 257 | UserCreatableClass *ucc = USER_CREATABLE_CLASS(klass); |
| 258 | ucc->complete = iothread_complete; |
Stefan Hajnoczi | 0d9d86f | 2016-12-01 19:26:45 +0000 | [diff] [blame] | 259 | |
| 260 | object_class_property_add(klass, "poll-max-ns", "int", |
Stefan Hajnoczi | 5e5db49 | 2016-12-01 19:26:52 +0000 | [diff] [blame] | 261 | iothread_get_poll_param, |
| 262 | iothread_set_poll_param, |
Markus Armbruster | d262312 | 2020-05-05 17:29:22 +0200 | [diff] [blame] | 263 | NULL, &poll_max_ns_info); |
Stefan Hajnoczi | 5e5db49 | 2016-12-01 19:26:52 +0000 | [diff] [blame] | 264 | object_class_property_add(klass, "poll-grow", "int", |
| 265 | iothread_get_poll_param, |
| 266 | iothread_set_poll_param, |
Markus Armbruster | d262312 | 2020-05-05 17:29:22 +0200 | [diff] [blame] | 267 | NULL, &poll_grow_info); |
Stefan Hajnoczi | 5e5db49 | 2016-12-01 19:26:52 +0000 | [diff] [blame] | 268 | object_class_property_add(klass, "poll-shrink", "int", |
| 269 | iothread_get_poll_param, |
| 270 | iothread_set_poll_param, |
Markus Armbruster | d262312 | 2020-05-05 17:29:22 +0200 | [diff] [blame] | 271 | NULL, &poll_shrink_info); |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 272 | } |
| 273 | |
| 274 | static const TypeInfo iothread_info = { |
| 275 | .name = TYPE_IOTHREAD, |
| 276 | .parent = TYPE_OBJECT, |
| 277 | .class_init = iothread_class_init, |
| 278 | .instance_size = sizeof(IOThread), |
Stefan Hajnoczi | cdd7abf | 2017-01-26 17:01:19 +0000 | [diff] [blame] | 279 | .instance_init = iothread_instance_init, |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 280 | .instance_finalize = iothread_instance_finalize, |
| 281 | .interfaces = (InterfaceInfo[]) { |
| 282 | {TYPE_USER_CREATABLE}, |
| 283 | {} |
| 284 | }, |
| 285 | }; |
| 286 | |
| 287 | static void iothread_register_types(void) |
| 288 | { |
| 289 | type_register_static(&iothread_info); |
| 290 | } |
| 291 | |
| 292 | type_init(iothread_register_types) |
| 293 | |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 294 | char *iothread_get_id(IOThread *iothread) |
| 295 | { |
Markus Armbruster | 7a309cc | 2020-07-14 18:02:00 +0200 | [diff] [blame] | 296 | return g_strdup(object_get_canonical_path_component(OBJECT(iothread))); |
Stefan Hajnoczi | be8d853 | 2014-03-03 11:30:05 +0100 | [diff] [blame] | 297 | } |
| 298 | |
| 299 | AioContext *iothread_get_aio_context(IOThread *iothread) |
| 300 | { |
| 301 | return iothread->ctx; |
| 302 | } |
Stefan Hajnoczi | dc3dd0d | 2014-02-27 11:48:42 +0100 | [diff] [blame] | 303 | |
| 304 | static int query_one_iothread(Object *object, void *opaque) |
| 305 | { |
Eric Blake | c3033fd | 2021-01-13 16:10:12 -0600 | [diff] [blame] | 306 | IOThreadInfoList ***tail = opaque; |
Stefan Hajnoczi | dc3dd0d | 2014-02-27 11:48:42 +0100 | [diff] [blame] | 307 | IOThreadInfo *info; |
| 308 | IOThread *iothread; |
| 309 | |
| 310 | iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD); |
| 311 | if (!iothread) { |
| 312 | return 0; |
| 313 | } |
| 314 | |
| 315 | info = g_new0(IOThreadInfo, 1); |
| 316 | info->id = iothread_get_id(iothread); |
| 317 | info->thread_id = iothread->thread_id; |
Pavel Hrdina | 5fc0048 | 2017-02-10 10:41:17 +0100 | [diff] [blame] | 318 | info->poll_max_ns = iothread->poll_max_ns; |
| 319 | info->poll_grow = iothread->poll_grow; |
| 320 | info->poll_shrink = iothread->poll_shrink; |
Stefan Hajnoczi | dc3dd0d | 2014-02-27 11:48:42 +0100 | [diff] [blame] | 321 | |
Eric Blake | c3033fd | 2021-01-13 16:10:12 -0600 | [diff] [blame] | 322 | QAPI_LIST_APPEND(*tail, info); |
Stefan Hajnoczi | dc3dd0d | 2014-02-27 11:48:42 +0100 | [diff] [blame] | 323 | return 0; |
| 324 | } |
| 325 | |
| 326 | IOThreadInfoList *qmp_query_iothreads(Error **errp) |
| 327 | { |
| 328 | IOThreadInfoList *head = NULL; |
| 329 | IOThreadInfoList **prev = &head; |
Daniel P. Berrange | bc2256c | 2015-05-13 17:14:05 +0100 | [diff] [blame] | 330 | Object *container = object_get_objects_root(); |
Stefan Hajnoczi | dc3dd0d | 2014-02-27 11:48:42 +0100 | [diff] [blame] | 331 | |
| 332 | object_child_foreach(container, query_one_iothread, &prev); |
| 333 | return head; |
| 334 | } |
Fam Zheng | dce8921 | 2016-09-08 17:28:51 +0800 | [diff] [blame] | 335 | |
Wang Yong | 329163c | 2017-08-29 15:22:37 +0800 | [diff] [blame] | 336 | GMainContext *iothread_get_g_main_context(IOThread *iothread) |
| 337 | { |
Stefan Hajnoczi | d73415a | 2020-09-23 11:56:46 +0100 | [diff] [blame] | 338 | qatomic_set(&iothread->run_gcontext, 1); |
Peter Xu | b506e0f | 2019-03-06 19:55:29 +0800 | [diff] [blame] | 339 | aio_notify(iothread->ctx); |
Wang Yong | 329163c | 2017-08-29 15:22:37 +0800 | [diff] [blame] | 340 | return iothread->worker_context; |
| 341 | } |
Peter Xu | 0173e21 | 2017-09-28 10:59:55 +0800 | [diff] [blame] | 342 | |
| 343 | IOThread *iothread_create(const char *id, Error **errp) |
| 344 | { |
| 345 | Object *obj; |
| 346 | |
| 347 | obj = object_new_with_props(TYPE_IOTHREAD, |
| 348 | object_get_internal_root(), |
| 349 | id, errp, NULL); |
| 350 | |
| 351 | return IOTHREAD(obj); |
| 352 | } |
| 353 | |
| 354 | void iothread_destroy(IOThread *iothread) |
| 355 | { |
| 356 | object_unparent(OBJECT(iothread)); |
| 357 | } |
Stefan Hajnoczi | fbcc692 | 2017-12-06 14:45:48 +0000 | [diff] [blame] | 358 | |
| 359 | /* Lookup IOThread by its id. Only finds user-created objects, not internal |
| 360 | * iothread_create() objects. */ |
| 361 | IOThread *iothread_by_id(const char *id) |
| 362 | { |
| 363 | return IOTHREAD(object_resolve_path_type(id, TYPE_IOTHREAD, NULL)); |
| 364 | } |
Elena Ufimtseva | ad22c30 | 2021-01-29 11:46:10 -0500 | [diff] [blame] | 365 | |
| 366 | bool qemu_in_iothread(void) |
| 367 | { |
| 368 | return qemu_get_current_aio_context() == qemu_get_aio_context() ? |
| 369 | false : true; |
| 370 | } |