133e9e9bdSKevin Wolf /* 233e9e9bdSKevin Wolf * Background jobs (long-running operations) 333e9e9bdSKevin Wolf * 433e9e9bdSKevin Wolf * Copyright (c) 2011 IBM Corp. 533e9e9bdSKevin Wolf * Copyright (c) 2012, 2018 Red Hat, Inc. 633e9e9bdSKevin Wolf * 733e9e9bdSKevin Wolf * Permission is hereby granted, free of charge, to any person obtaining a copy 833e9e9bdSKevin Wolf * of this software and associated documentation files (the "Software"), to deal 933e9e9bdSKevin Wolf * in the Software without restriction, including without limitation the rights 1033e9e9bdSKevin Wolf * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 1133e9e9bdSKevin Wolf * copies of the Software, and to permit persons to whom the Software is 1233e9e9bdSKevin Wolf * furnished to do so, subject to the following conditions: 1333e9e9bdSKevin Wolf * 1433e9e9bdSKevin Wolf * The above copyright notice and this permission notice shall be included in 1533e9e9bdSKevin Wolf * all copies or substantial portions of the Software. 1633e9e9bdSKevin Wolf * 1733e9e9bdSKevin Wolf * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 1833e9e9bdSKevin Wolf * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 1933e9e9bdSKevin Wolf * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 2033e9e9bdSKevin Wolf * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 2133e9e9bdSKevin Wolf * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 2233e9e9bdSKevin Wolf * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 2333e9e9bdSKevin Wolf * THE SOFTWARE. 2433e9e9bdSKevin Wolf */ 2533e9e9bdSKevin Wolf 2633e9e9bdSKevin Wolf #include "qemu/osdep.h" 2733e9e9bdSKevin Wolf #include "qemu-common.h" 2833e9e9bdSKevin Wolf #include "qapi/error.h" 2933e9e9bdSKevin Wolf #include "qemu/job.h" 3033e9e9bdSKevin Wolf #include "qemu/id.h" 311908a559SKevin Wolf #include "qemu/main-loop.h" 32a50c2ab8SKevin Wolf #include "trace-root.h" 3333e9e9bdSKevin Wolf 34e7c1d78bSKevin Wolf static QLIST_HEAD(, Job) jobs = QLIST_HEAD_INITIALIZER(jobs); 35e7c1d78bSKevin Wolf 36a50c2ab8SKevin Wolf /* Job State Transition Table */ 37a50c2ab8SKevin Wolf bool JobSTT[JOB_STATUS__MAX][JOB_STATUS__MAX] = { 38a50c2ab8SKevin Wolf /* U, C, R, P, Y, S, W, D, X, E, N */ 39a50c2ab8SKevin Wolf /* U: */ [JOB_STATUS_UNDEFINED] = {0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 40a50c2ab8SKevin Wolf /* C: */ [JOB_STATUS_CREATED] = {0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1}, 41a50c2ab8SKevin Wolf /* R: */ [JOB_STATUS_RUNNING] = {0, 0, 0, 1, 1, 0, 1, 0, 1, 0, 0}, 42a50c2ab8SKevin Wolf /* P: */ [JOB_STATUS_PAUSED] = {0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0}, 43a50c2ab8SKevin Wolf /* Y: */ [JOB_STATUS_READY] = {0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0}, 44a50c2ab8SKevin Wolf /* S: */ [JOB_STATUS_STANDBY] = {0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0}, 45a50c2ab8SKevin Wolf /* W: */ [JOB_STATUS_WAITING] = {0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0}, 46a50c2ab8SKevin Wolf /* D: */ [JOB_STATUS_PENDING] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0}, 47a50c2ab8SKevin Wolf /* X: */ [JOB_STATUS_ABORTING] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0}, 48a50c2ab8SKevin Wolf /* E: */ [JOB_STATUS_CONCLUDED] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}, 49a50c2ab8SKevin Wolf /* N: */ [JOB_STATUS_NULL] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 50a50c2ab8SKevin Wolf }; 51a50c2ab8SKevin Wolf 52a50c2ab8SKevin Wolf bool JobVerbTable[JOB_VERB__MAX][JOB_STATUS__MAX] = { 53a50c2ab8SKevin Wolf /* U, C, R, P, Y, S, W, D, X, E, N */ 54a50c2ab8SKevin Wolf [JOB_VERB_CANCEL] = {0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0}, 55a50c2ab8SKevin Wolf [JOB_VERB_PAUSE] = {0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0}, 56a50c2ab8SKevin Wolf [JOB_VERB_RESUME] = {0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0}, 57a50c2ab8SKevin Wolf [JOB_VERB_SET_SPEED] = {0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0}, 58a50c2ab8SKevin Wolf [JOB_VERB_COMPLETE] = {0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0}, 59a50c2ab8SKevin Wolf [JOB_VERB_FINALIZE] = {0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0}, 60a50c2ab8SKevin Wolf [JOB_VERB_DISMISS] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0}, 61a50c2ab8SKevin Wolf }; 62a50c2ab8SKevin Wolf 63da01ff7fSKevin Wolf /* Right now, this mutex is only needed to synchronize accesses to job->busy 64da01ff7fSKevin Wolf * and job->sleep_timer, such as concurrent calls to job_do_yield and 65da01ff7fSKevin Wolf * job_enter. */ 66da01ff7fSKevin Wolf static QemuMutex job_mutex; 67da01ff7fSKevin Wolf 68da01ff7fSKevin Wolf static void job_lock(void) 69da01ff7fSKevin Wolf { 70da01ff7fSKevin Wolf qemu_mutex_lock(&job_mutex); 71da01ff7fSKevin Wolf } 72da01ff7fSKevin Wolf 73da01ff7fSKevin Wolf static void job_unlock(void) 74da01ff7fSKevin Wolf { 75da01ff7fSKevin Wolf qemu_mutex_unlock(&job_mutex); 76da01ff7fSKevin Wolf } 77da01ff7fSKevin Wolf 78da01ff7fSKevin Wolf static void __attribute__((__constructor__)) job_init(void) 79da01ff7fSKevin Wolf { 80da01ff7fSKevin Wolf qemu_mutex_init(&job_mutex); 81da01ff7fSKevin Wolf } 82da01ff7fSKevin Wolf 83a50c2ab8SKevin Wolf /* TODO Make static once the whole state machine is in job.c */ 84a50c2ab8SKevin Wolf void job_state_transition(Job *job, JobStatus s1) 85a50c2ab8SKevin Wolf { 86a50c2ab8SKevin Wolf JobStatus s0 = job->status; 87a50c2ab8SKevin Wolf assert(s1 >= 0 && s1 <= JOB_STATUS__MAX); 88a50c2ab8SKevin Wolf trace_job_state_transition(job, /* TODO re-enable: job->ret */ 0, 89a50c2ab8SKevin Wolf JobSTT[s0][s1] ? "allowed" : "disallowed", 90a50c2ab8SKevin Wolf JobStatus_str(s0), JobStatus_str(s1)); 91a50c2ab8SKevin Wolf assert(JobSTT[s0][s1]); 92a50c2ab8SKevin Wolf job->status = s1; 93a50c2ab8SKevin Wolf } 94a50c2ab8SKevin Wolf 95a50c2ab8SKevin Wolf int job_apply_verb(Job *job, JobVerb verb, Error **errp) 96a50c2ab8SKevin Wolf { 97a50c2ab8SKevin Wolf JobStatus s0 = job->status; 98a50c2ab8SKevin Wolf assert(verb >= 0 && verb <= JOB_VERB__MAX); 99a50c2ab8SKevin Wolf trace_job_apply_verb(job, JobStatus_str(s0), JobVerb_str(verb), 100a50c2ab8SKevin Wolf JobVerbTable[verb][s0] ? "allowed" : "prohibited"); 101a50c2ab8SKevin Wolf if (JobVerbTable[verb][s0]) { 102a50c2ab8SKevin Wolf return 0; 103a50c2ab8SKevin Wolf } 104a50c2ab8SKevin Wolf error_setg(errp, "Job '%s' in state '%s' cannot accept command verb '%s'", 105a50c2ab8SKevin Wolf job->id, JobStatus_str(s0), JobVerb_str(verb)); 106a50c2ab8SKevin Wolf return -EPERM; 107a50c2ab8SKevin Wolf } 108a50c2ab8SKevin Wolf 109252291eaSKevin Wolf JobType job_type(const Job *job) 110252291eaSKevin Wolf { 111252291eaSKevin Wolf return job->driver->job_type; 112252291eaSKevin Wolf } 113252291eaSKevin Wolf 114252291eaSKevin Wolf const char *job_type_str(const Job *job) 115252291eaSKevin Wolf { 116252291eaSKevin Wolf return JobType_str(job_type(job)); 117252291eaSKevin Wolf } 118252291eaSKevin Wolf 119daa7f2f9SKevin Wolf bool job_is_cancelled(Job *job) 120daa7f2f9SKevin Wolf { 121daa7f2f9SKevin Wolf return job->cancelled; 122daa7f2f9SKevin Wolf } 123daa7f2f9SKevin Wolf 124dbe5e6c1SKevin Wolf bool job_is_completed(Job *job) 125dbe5e6c1SKevin Wolf { 126dbe5e6c1SKevin Wolf switch (job->status) { 127dbe5e6c1SKevin Wolf case JOB_STATUS_UNDEFINED: 128dbe5e6c1SKevin Wolf case JOB_STATUS_CREATED: 129dbe5e6c1SKevin Wolf case JOB_STATUS_RUNNING: 130dbe5e6c1SKevin Wolf case JOB_STATUS_PAUSED: 131dbe5e6c1SKevin Wolf case JOB_STATUS_READY: 132dbe5e6c1SKevin Wolf case JOB_STATUS_STANDBY: 133dbe5e6c1SKevin Wolf return false; 134dbe5e6c1SKevin Wolf case JOB_STATUS_WAITING: 135dbe5e6c1SKevin Wolf case JOB_STATUS_PENDING: 136dbe5e6c1SKevin Wolf case JOB_STATUS_ABORTING: 137dbe5e6c1SKevin Wolf case JOB_STATUS_CONCLUDED: 138dbe5e6c1SKevin Wolf case JOB_STATUS_NULL: 139dbe5e6c1SKevin Wolf return true; 140dbe5e6c1SKevin Wolf default: 141dbe5e6c1SKevin Wolf g_assert_not_reached(); 142dbe5e6c1SKevin Wolf } 143dbe5e6c1SKevin Wolf return false; 144dbe5e6c1SKevin Wolf } 145dbe5e6c1SKevin Wolf 146da01ff7fSKevin Wolf bool job_started(Job *job) 147da01ff7fSKevin Wolf { 148da01ff7fSKevin Wolf return job->co; 149da01ff7fSKevin Wolf } 150da01ff7fSKevin Wolf 151da01ff7fSKevin Wolf bool job_should_pause(Job *job) 152da01ff7fSKevin Wolf { 153da01ff7fSKevin Wolf return job->pause_count > 0; 154da01ff7fSKevin Wolf } 155da01ff7fSKevin Wolf 156e7c1d78bSKevin Wolf Job *job_next(Job *job) 157e7c1d78bSKevin Wolf { 158e7c1d78bSKevin Wolf if (!job) { 159e7c1d78bSKevin Wolf return QLIST_FIRST(&jobs); 160e7c1d78bSKevin Wolf } 161e7c1d78bSKevin Wolf return QLIST_NEXT(job, job_list); 162e7c1d78bSKevin Wolf } 163e7c1d78bSKevin Wolf 164e7c1d78bSKevin Wolf Job *job_get(const char *id) 165e7c1d78bSKevin Wolf { 166e7c1d78bSKevin Wolf Job *job; 167e7c1d78bSKevin Wolf 168e7c1d78bSKevin Wolf QLIST_FOREACH(job, &jobs, job_list) { 169e7c1d78bSKevin Wolf if (job->id && !strcmp(id, job->id)) { 170e7c1d78bSKevin Wolf return job; 171e7c1d78bSKevin Wolf } 172e7c1d78bSKevin Wolf } 173e7c1d78bSKevin Wolf 174e7c1d78bSKevin Wolf return NULL; 175e7c1d78bSKevin Wolf } 176e7c1d78bSKevin Wolf 1775d43e86eSKevin Wolf static void job_sleep_timer_cb(void *opaque) 1785d43e86eSKevin Wolf { 1795d43e86eSKevin Wolf Job *job = opaque; 1805d43e86eSKevin Wolf 1815d43e86eSKevin Wolf job_enter(job); 1825d43e86eSKevin Wolf } 1835d43e86eSKevin Wolf 18408be6fe2SKevin Wolf void *job_create(const char *job_id, const JobDriver *driver, AioContext *ctx, 185*bb02b65cSKevin Wolf int flags, Error **errp) 18633e9e9bdSKevin Wolf { 18733e9e9bdSKevin Wolf Job *job; 18833e9e9bdSKevin Wolf 18933e9e9bdSKevin Wolf if (job_id) { 190*bb02b65cSKevin Wolf if (flags & JOB_INTERNAL) { 191*bb02b65cSKevin Wolf error_setg(errp, "Cannot specify job ID for internal job"); 192*bb02b65cSKevin Wolf return NULL; 193*bb02b65cSKevin Wolf } 19433e9e9bdSKevin Wolf if (!id_wellformed(job_id)) { 19533e9e9bdSKevin Wolf error_setg(errp, "Invalid job ID '%s'", job_id); 19633e9e9bdSKevin Wolf return NULL; 19733e9e9bdSKevin Wolf } 198e7c1d78bSKevin Wolf if (job_get(job_id)) { 199e7c1d78bSKevin Wolf error_setg(errp, "Job ID '%s' already in use", job_id); 200e7c1d78bSKevin Wolf return NULL; 201e7c1d78bSKevin Wolf } 202*bb02b65cSKevin Wolf } else if (!(flags & JOB_INTERNAL)) { 203*bb02b65cSKevin Wolf error_setg(errp, "An explicit job ID is required"); 204*bb02b65cSKevin Wolf return NULL; 20533e9e9bdSKevin Wolf } 20633e9e9bdSKevin Wolf 20733e9e9bdSKevin Wolf job = g_malloc0(driver->instance_size); 20833e9e9bdSKevin Wolf job->driver = driver; 20933e9e9bdSKevin Wolf job->id = g_strdup(job_id); 21080fa2c75SKevin Wolf job->refcnt = 1; 21108be6fe2SKevin Wolf job->aio_context = ctx; 212da01ff7fSKevin Wolf job->busy = false; 213da01ff7fSKevin Wolf job->paused = true; 214da01ff7fSKevin Wolf job->pause_count = 1; 215*bb02b65cSKevin Wolf job->auto_finalize = !(flags & JOB_MANUAL_FINALIZE); 216*bb02b65cSKevin Wolf job->auto_dismiss = !(flags & JOB_MANUAL_DISMISS); 21733e9e9bdSKevin Wolf 218a50c2ab8SKevin Wolf job_state_transition(job, JOB_STATUS_CREATED); 2195d43e86eSKevin Wolf aio_timer_init(qemu_get_aio_context(), &job->sleep_timer, 2205d43e86eSKevin Wolf QEMU_CLOCK_REALTIME, SCALE_NS, 2215d43e86eSKevin Wolf job_sleep_timer_cb, job); 222a50c2ab8SKevin Wolf 223e7c1d78bSKevin Wolf QLIST_INSERT_HEAD(&jobs, job, job_list); 224e7c1d78bSKevin Wolf 22533e9e9bdSKevin Wolf return job; 22633e9e9bdSKevin Wolf } 227fd61a701SKevin Wolf 22880fa2c75SKevin Wolf void job_ref(Job *job) 229fd61a701SKevin Wolf { 23080fa2c75SKevin Wolf ++job->refcnt; 23180fa2c75SKevin Wolf } 23280fa2c75SKevin Wolf 23380fa2c75SKevin Wolf void job_unref(Job *job) 23480fa2c75SKevin Wolf { 23580fa2c75SKevin Wolf if (--job->refcnt == 0) { 23680fa2c75SKevin Wolf assert(job->status == JOB_STATUS_NULL); 2375d43e86eSKevin Wolf assert(!timer_pending(&job->sleep_timer)); 23880fa2c75SKevin Wolf 23980fa2c75SKevin Wolf if (job->driver->free) { 24080fa2c75SKevin Wolf job->driver->free(job); 24180fa2c75SKevin Wolf } 24280fa2c75SKevin Wolf 243e7c1d78bSKevin Wolf QLIST_REMOVE(job, job_list); 244e7c1d78bSKevin Wolf 245fd61a701SKevin Wolf g_free(job->id); 246fd61a701SKevin Wolf g_free(job); 247fd61a701SKevin Wolf } 24880fa2c75SKevin Wolf } 2491908a559SKevin Wolf 250da01ff7fSKevin Wolf void job_enter_cond(Job *job, bool(*fn)(Job *job)) 251da01ff7fSKevin Wolf { 252da01ff7fSKevin Wolf if (!job_started(job)) { 253da01ff7fSKevin Wolf return; 254da01ff7fSKevin Wolf } 255da01ff7fSKevin Wolf if (job->deferred_to_main_loop) { 256da01ff7fSKevin Wolf return; 257da01ff7fSKevin Wolf } 258da01ff7fSKevin Wolf 259da01ff7fSKevin Wolf job_lock(); 260da01ff7fSKevin Wolf if (job->busy) { 261da01ff7fSKevin Wolf job_unlock(); 262da01ff7fSKevin Wolf return; 263da01ff7fSKevin Wolf } 264da01ff7fSKevin Wolf 265da01ff7fSKevin Wolf if (fn && !fn(job)) { 266da01ff7fSKevin Wolf job_unlock(); 267da01ff7fSKevin Wolf return; 268da01ff7fSKevin Wolf } 269da01ff7fSKevin Wolf 270da01ff7fSKevin Wolf assert(!job->deferred_to_main_loop); 271da01ff7fSKevin Wolf timer_del(&job->sleep_timer); 272da01ff7fSKevin Wolf job->busy = true; 273da01ff7fSKevin Wolf job_unlock(); 274da01ff7fSKevin Wolf aio_co_wake(job->co); 275da01ff7fSKevin Wolf } 276da01ff7fSKevin Wolf 2775d43e86eSKevin Wolf void job_enter(Job *job) 2785d43e86eSKevin Wolf { 2795d43e86eSKevin Wolf job_enter_cond(job, NULL); 2805d43e86eSKevin Wolf } 2815d43e86eSKevin Wolf 282da01ff7fSKevin Wolf /* Yield, and schedule a timer to reenter the coroutine after @ns nanoseconds. 283da01ff7fSKevin Wolf * Reentering the job coroutine with block_job_enter() before the timer has 284da01ff7fSKevin Wolf * expired is allowed and cancels the timer. 285da01ff7fSKevin Wolf * 286da01ff7fSKevin Wolf * If @ns is (uint64_t) -1, no timer is scheduled and block_job_enter() must be 287da01ff7fSKevin Wolf * called explicitly. */ 288da01ff7fSKevin Wolf void coroutine_fn job_do_yield(Job *job, uint64_t ns) 289da01ff7fSKevin Wolf { 290da01ff7fSKevin Wolf job_lock(); 291da01ff7fSKevin Wolf if (ns != -1) { 292da01ff7fSKevin Wolf timer_mod(&job->sleep_timer, ns); 293da01ff7fSKevin Wolf } 294da01ff7fSKevin Wolf job->busy = false; 295da01ff7fSKevin Wolf job_unlock(); 296da01ff7fSKevin Wolf qemu_coroutine_yield(); 297da01ff7fSKevin Wolf 298da01ff7fSKevin Wolf /* Set by job_enter_cond() before re-entering the coroutine. */ 299da01ff7fSKevin Wolf assert(job->busy); 300da01ff7fSKevin Wolf } 301da01ff7fSKevin Wolf 302da01ff7fSKevin Wolf void coroutine_fn job_pause_point(Job *job) 303da01ff7fSKevin Wolf { 304da01ff7fSKevin Wolf assert(job && job_started(job)); 305da01ff7fSKevin Wolf 306da01ff7fSKevin Wolf if (!job_should_pause(job)) { 307da01ff7fSKevin Wolf return; 308da01ff7fSKevin Wolf } 309da01ff7fSKevin Wolf if (job_is_cancelled(job)) { 310da01ff7fSKevin Wolf return; 311da01ff7fSKevin Wolf } 312da01ff7fSKevin Wolf 313da01ff7fSKevin Wolf if (job->driver->pause) { 314da01ff7fSKevin Wolf job->driver->pause(job); 315da01ff7fSKevin Wolf } 316da01ff7fSKevin Wolf 317da01ff7fSKevin Wolf if (job_should_pause(job) && !job_is_cancelled(job)) { 318da01ff7fSKevin Wolf JobStatus status = job->status; 319da01ff7fSKevin Wolf job_state_transition(job, status == JOB_STATUS_READY 320da01ff7fSKevin Wolf ? JOB_STATUS_STANDBY 321da01ff7fSKevin Wolf : JOB_STATUS_PAUSED); 322da01ff7fSKevin Wolf job->paused = true; 323da01ff7fSKevin Wolf job_do_yield(job, -1); 324da01ff7fSKevin Wolf job->paused = false; 325da01ff7fSKevin Wolf job_state_transition(job, status); 326da01ff7fSKevin Wolf } 327da01ff7fSKevin Wolf 328da01ff7fSKevin Wolf if (job->driver->resume) { 329da01ff7fSKevin Wolf job->driver->resume(job); 330da01ff7fSKevin Wolf } 331da01ff7fSKevin Wolf } 332da01ff7fSKevin Wolf 3335d43e86eSKevin Wolf void coroutine_fn job_sleep_ns(Job *job, int64_t ns) 3345d43e86eSKevin Wolf { 3355d43e86eSKevin Wolf assert(job->busy); 3365d43e86eSKevin Wolf 3375d43e86eSKevin Wolf /* Check cancellation *before* setting busy = false, too! */ 3385d43e86eSKevin Wolf if (job_is_cancelled(job)) { 3395d43e86eSKevin Wolf return; 3405d43e86eSKevin Wolf } 3415d43e86eSKevin Wolf 3425d43e86eSKevin Wolf if (!job_should_pause(job)) { 3435d43e86eSKevin Wolf job_do_yield(job, qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + ns); 3445d43e86eSKevin Wolf } 3455d43e86eSKevin Wolf 3465d43e86eSKevin Wolf job_pause_point(job); 3475d43e86eSKevin Wolf } 3485d43e86eSKevin Wolf 349da01ff7fSKevin Wolf /** 350da01ff7fSKevin Wolf * All jobs must allow a pause point before entering their job proper. This 351da01ff7fSKevin Wolf * ensures that jobs can be paused prior to being started, then resumed later. 352da01ff7fSKevin Wolf */ 353da01ff7fSKevin Wolf static void coroutine_fn job_co_entry(void *opaque) 354da01ff7fSKevin Wolf { 355da01ff7fSKevin Wolf Job *job = opaque; 356da01ff7fSKevin Wolf 357da01ff7fSKevin Wolf assert(job && job->driver && job->driver->start); 358da01ff7fSKevin Wolf job_pause_point(job); 359da01ff7fSKevin Wolf job->driver->start(job); 360da01ff7fSKevin Wolf } 361da01ff7fSKevin Wolf 362da01ff7fSKevin Wolf 363da01ff7fSKevin Wolf void job_start(Job *job) 364da01ff7fSKevin Wolf { 365da01ff7fSKevin Wolf assert(job && !job_started(job) && job->paused && 366da01ff7fSKevin Wolf job->driver && job->driver->start); 367da01ff7fSKevin Wolf job->co = qemu_coroutine_create(job_co_entry, job); 368da01ff7fSKevin Wolf job->pause_count--; 369da01ff7fSKevin Wolf job->busy = true; 370da01ff7fSKevin Wolf job->paused = false; 371da01ff7fSKevin Wolf job_state_transition(job, JOB_STATUS_RUNNING); 372da01ff7fSKevin Wolf aio_co_enter(job->aio_context, job->co); 373da01ff7fSKevin Wolf } 374da01ff7fSKevin Wolf 375b15de828SKevin Wolf /* Assumes the block_job_mutex is held */ 376b15de828SKevin Wolf static bool job_timer_not_pending(Job *job) 377b15de828SKevin Wolf { 378b15de828SKevin Wolf return !timer_pending(&job->sleep_timer); 379b15de828SKevin Wolf } 380b15de828SKevin Wolf 381b15de828SKevin Wolf void job_pause(Job *job) 382b15de828SKevin Wolf { 383b15de828SKevin Wolf job->pause_count++; 384b15de828SKevin Wolf } 385b15de828SKevin Wolf 386b15de828SKevin Wolf void job_resume(Job *job) 387b15de828SKevin Wolf { 388b15de828SKevin Wolf assert(job->pause_count > 0); 389b15de828SKevin Wolf job->pause_count--; 390b15de828SKevin Wolf if (job->pause_count) { 391b15de828SKevin Wolf return; 392b15de828SKevin Wolf } 393b15de828SKevin Wolf 394b15de828SKevin Wolf /* kick only if no timer is pending */ 395b15de828SKevin Wolf job_enter_cond(job, job_timer_not_pending); 396b15de828SKevin Wolf } 397b15de828SKevin Wolf 398b15de828SKevin Wolf void job_user_pause(Job *job, Error **errp) 399b15de828SKevin Wolf { 400b15de828SKevin Wolf if (job_apply_verb(job, JOB_VERB_PAUSE, errp)) { 401b15de828SKevin Wolf return; 402b15de828SKevin Wolf } 403b15de828SKevin Wolf if (job->user_paused) { 404b15de828SKevin Wolf error_setg(errp, "Job is already paused"); 405b15de828SKevin Wolf return; 406b15de828SKevin Wolf } 407b15de828SKevin Wolf job->user_paused = true; 408b15de828SKevin Wolf job_pause(job); 409b15de828SKevin Wolf } 410b15de828SKevin Wolf 411b15de828SKevin Wolf bool job_user_paused(Job *job) 412b15de828SKevin Wolf { 413b15de828SKevin Wolf return job->user_paused; 414b15de828SKevin Wolf } 415b15de828SKevin Wolf 416b15de828SKevin Wolf void job_user_resume(Job *job, Error **errp) 417b15de828SKevin Wolf { 418b15de828SKevin Wolf assert(job); 419b15de828SKevin Wolf if (!job->user_paused || job->pause_count <= 0) { 420b15de828SKevin Wolf error_setg(errp, "Can't resume a job that was not paused"); 421b15de828SKevin Wolf return; 422b15de828SKevin Wolf } 423b15de828SKevin Wolf if (job_apply_verb(job, JOB_VERB_RESUME, errp)) { 424b15de828SKevin Wolf return; 425b15de828SKevin Wolf } 426b15de828SKevin Wolf if (job->driver->user_resume) { 427b15de828SKevin Wolf job->driver->user_resume(job); 428b15de828SKevin Wolf } 429b15de828SKevin Wolf job->user_paused = false; 430b15de828SKevin Wolf job_resume(job); 431b15de828SKevin Wolf } 432b15de828SKevin Wolf 433b15de828SKevin Wolf 4341908a559SKevin Wolf typedef struct { 4351908a559SKevin Wolf Job *job; 4361908a559SKevin Wolf JobDeferToMainLoopFn *fn; 4371908a559SKevin Wolf void *opaque; 4381908a559SKevin Wolf } JobDeferToMainLoopData; 4391908a559SKevin Wolf 4401908a559SKevin Wolf static void job_defer_to_main_loop_bh(void *opaque) 4411908a559SKevin Wolf { 4421908a559SKevin Wolf JobDeferToMainLoopData *data = opaque; 4431908a559SKevin Wolf Job *job = data->job; 4441908a559SKevin Wolf AioContext *aio_context = job->aio_context; 4451908a559SKevin Wolf 4461908a559SKevin Wolf aio_context_acquire(aio_context); 4471908a559SKevin Wolf data->fn(data->job, data->opaque); 4481908a559SKevin Wolf aio_context_release(aio_context); 4491908a559SKevin Wolf 4501908a559SKevin Wolf g_free(data); 4511908a559SKevin Wolf } 4521908a559SKevin Wolf 4531908a559SKevin Wolf void job_defer_to_main_loop(Job *job, JobDeferToMainLoopFn *fn, void *opaque) 4541908a559SKevin Wolf { 4551908a559SKevin Wolf JobDeferToMainLoopData *data = g_malloc(sizeof(*data)); 4561908a559SKevin Wolf data->job = job; 4571908a559SKevin Wolf data->fn = fn; 4581908a559SKevin Wolf data->opaque = opaque; 4591908a559SKevin Wolf job->deferred_to_main_loop = true; 4601908a559SKevin Wolf 4611908a559SKevin Wolf aio_bh_schedule_oneshot(qemu_get_aio_context(), 4621908a559SKevin Wolf job_defer_to_main_loop_bh, data); 4631908a559SKevin Wolf } 464