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 124da01ff7fSKevin Wolf bool job_started(Job *job) 125da01ff7fSKevin Wolf { 126da01ff7fSKevin Wolf return job->co; 127da01ff7fSKevin Wolf } 128da01ff7fSKevin Wolf 129da01ff7fSKevin Wolf bool job_should_pause(Job *job) 130da01ff7fSKevin Wolf { 131da01ff7fSKevin Wolf return job->pause_count > 0; 132da01ff7fSKevin Wolf } 133da01ff7fSKevin Wolf 134e7c1d78bSKevin Wolf Job *job_next(Job *job) 135e7c1d78bSKevin Wolf { 136e7c1d78bSKevin Wolf if (!job) { 137e7c1d78bSKevin Wolf return QLIST_FIRST(&jobs); 138e7c1d78bSKevin Wolf } 139e7c1d78bSKevin Wolf return QLIST_NEXT(job, job_list); 140e7c1d78bSKevin Wolf } 141e7c1d78bSKevin Wolf 142e7c1d78bSKevin Wolf Job *job_get(const char *id) 143e7c1d78bSKevin Wolf { 144e7c1d78bSKevin Wolf Job *job; 145e7c1d78bSKevin Wolf 146e7c1d78bSKevin Wolf QLIST_FOREACH(job, &jobs, job_list) { 147e7c1d78bSKevin Wolf if (job->id && !strcmp(id, job->id)) { 148e7c1d78bSKevin Wolf return job; 149e7c1d78bSKevin Wolf } 150e7c1d78bSKevin Wolf } 151e7c1d78bSKevin Wolf 152e7c1d78bSKevin Wolf return NULL; 153e7c1d78bSKevin Wolf } 154e7c1d78bSKevin Wolf 1555d43e86eSKevin Wolf static void job_sleep_timer_cb(void *opaque) 1565d43e86eSKevin Wolf { 1575d43e86eSKevin Wolf Job *job = opaque; 1585d43e86eSKevin Wolf 1595d43e86eSKevin Wolf job_enter(job); 1605d43e86eSKevin Wolf } 1615d43e86eSKevin Wolf 16208be6fe2SKevin Wolf void *job_create(const char *job_id, const JobDriver *driver, AioContext *ctx, 16308be6fe2SKevin Wolf Error **errp) 16433e9e9bdSKevin Wolf { 16533e9e9bdSKevin Wolf Job *job; 16633e9e9bdSKevin Wolf 16733e9e9bdSKevin Wolf if (job_id) { 16833e9e9bdSKevin Wolf if (!id_wellformed(job_id)) { 16933e9e9bdSKevin Wolf error_setg(errp, "Invalid job ID '%s'", job_id); 17033e9e9bdSKevin Wolf return NULL; 17133e9e9bdSKevin Wolf } 172e7c1d78bSKevin Wolf if (job_get(job_id)) { 173e7c1d78bSKevin Wolf error_setg(errp, "Job ID '%s' already in use", job_id); 174e7c1d78bSKevin Wolf return NULL; 175e7c1d78bSKevin Wolf } 17633e9e9bdSKevin Wolf } 17733e9e9bdSKevin Wolf 17833e9e9bdSKevin Wolf job = g_malloc0(driver->instance_size); 17933e9e9bdSKevin Wolf job->driver = driver; 18033e9e9bdSKevin Wolf job->id = g_strdup(job_id); 18180fa2c75SKevin Wolf job->refcnt = 1; 18208be6fe2SKevin Wolf job->aio_context = ctx; 183da01ff7fSKevin Wolf job->busy = false; 184da01ff7fSKevin Wolf job->paused = true; 185da01ff7fSKevin Wolf job->pause_count = 1; 18633e9e9bdSKevin Wolf 187a50c2ab8SKevin Wolf job_state_transition(job, JOB_STATUS_CREATED); 1885d43e86eSKevin Wolf aio_timer_init(qemu_get_aio_context(), &job->sleep_timer, 1895d43e86eSKevin Wolf QEMU_CLOCK_REALTIME, SCALE_NS, 1905d43e86eSKevin Wolf job_sleep_timer_cb, job); 191a50c2ab8SKevin Wolf 192e7c1d78bSKevin Wolf QLIST_INSERT_HEAD(&jobs, job, job_list); 193e7c1d78bSKevin Wolf 19433e9e9bdSKevin Wolf return job; 19533e9e9bdSKevin Wolf } 196fd61a701SKevin Wolf 19780fa2c75SKevin Wolf void job_ref(Job *job) 198fd61a701SKevin Wolf { 19980fa2c75SKevin Wolf ++job->refcnt; 20080fa2c75SKevin Wolf } 20180fa2c75SKevin Wolf 20280fa2c75SKevin Wolf void job_unref(Job *job) 20380fa2c75SKevin Wolf { 20480fa2c75SKevin Wolf if (--job->refcnt == 0) { 20580fa2c75SKevin Wolf assert(job->status == JOB_STATUS_NULL); 2065d43e86eSKevin Wolf assert(!timer_pending(&job->sleep_timer)); 20780fa2c75SKevin Wolf 20880fa2c75SKevin Wolf if (job->driver->free) { 20980fa2c75SKevin Wolf job->driver->free(job); 21080fa2c75SKevin Wolf } 21180fa2c75SKevin Wolf 212e7c1d78bSKevin Wolf QLIST_REMOVE(job, job_list); 213e7c1d78bSKevin Wolf 214fd61a701SKevin Wolf g_free(job->id); 215fd61a701SKevin Wolf g_free(job); 216fd61a701SKevin Wolf } 21780fa2c75SKevin Wolf } 2181908a559SKevin Wolf 219da01ff7fSKevin Wolf void job_enter_cond(Job *job, bool(*fn)(Job *job)) 220da01ff7fSKevin Wolf { 221da01ff7fSKevin Wolf if (!job_started(job)) { 222da01ff7fSKevin Wolf return; 223da01ff7fSKevin Wolf } 224da01ff7fSKevin Wolf if (job->deferred_to_main_loop) { 225da01ff7fSKevin Wolf return; 226da01ff7fSKevin Wolf } 227da01ff7fSKevin Wolf 228da01ff7fSKevin Wolf job_lock(); 229da01ff7fSKevin Wolf if (job->busy) { 230da01ff7fSKevin Wolf job_unlock(); 231da01ff7fSKevin Wolf return; 232da01ff7fSKevin Wolf } 233da01ff7fSKevin Wolf 234da01ff7fSKevin Wolf if (fn && !fn(job)) { 235da01ff7fSKevin Wolf job_unlock(); 236da01ff7fSKevin Wolf return; 237da01ff7fSKevin Wolf } 238da01ff7fSKevin Wolf 239da01ff7fSKevin Wolf assert(!job->deferred_to_main_loop); 240da01ff7fSKevin Wolf timer_del(&job->sleep_timer); 241da01ff7fSKevin Wolf job->busy = true; 242da01ff7fSKevin Wolf job_unlock(); 243da01ff7fSKevin Wolf aio_co_wake(job->co); 244da01ff7fSKevin Wolf } 245da01ff7fSKevin Wolf 2465d43e86eSKevin Wolf void job_enter(Job *job) 2475d43e86eSKevin Wolf { 2485d43e86eSKevin Wolf job_enter_cond(job, NULL); 2495d43e86eSKevin Wolf } 2505d43e86eSKevin Wolf 251da01ff7fSKevin Wolf /* Yield, and schedule a timer to reenter the coroutine after @ns nanoseconds. 252da01ff7fSKevin Wolf * Reentering the job coroutine with block_job_enter() before the timer has 253da01ff7fSKevin Wolf * expired is allowed and cancels the timer. 254da01ff7fSKevin Wolf * 255da01ff7fSKevin Wolf * If @ns is (uint64_t) -1, no timer is scheduled and block_job_enter() must be 256da01ff7fSKevin Wolf * called explicitly. */ 257da01ff7fSKevin Wolf void coroutine_fn job_do_yield(Job *job, uint64_t ns) 258da01ff7fSKevin Wolf { 259da01ff7fSKevin Wolf job_lock(); 260da01ff7fSKevin Wolf if (ns != -1) { 261da01ff7fSKevin Wolf timer_mod(&job->sleep_timer, ns); 262da01ff7fSKevin Wolf } 263da01ff7fSKevin Wolf job->busy = false; 264da01ff7fSKevin Wolf job_unlock(); 265da01ff7fSKevin Wolf qemu_coroutine_yield(); 266da01ff7fSKevin Wolf 267da01ff7fSKevin Wolf /* Set by job_enter_cond() before re-entering the coroutine. */ 268da01ff7fSKevin Wolf assert(job->busy); 269da01ff7fSKevin Wolf } 270da01ff7fSKevin Wolf 271da01ff7fSKevin Wolf void coroutine_fn job_pause_point(Job *job) 272da01ff7fSKevin Wolf { 273da01ff7fSKevin Wolf assert(job && job_started(job)); 274da01ff7fSKevin Wolf 275da01ff7fSKevin Wolf if (!job_should_pause(job)) { 276da01ff7fSKevin Wolf return; 277da01ff7fSKevin Wolf } 278da01ff7fSKevin Wolf if (job_is_cancelled(job)) { 279da01ff7fSKevin Wolf return; 280da01ff7fSKevin Wolf } 281da01ff7fSKevin Wolf 282da01ff7fSKevin Wolf if (job->driver->pause) { 283da01ff7fSKevin Wolf job->driver->pause(job); 284da01ff7fSKevin Wolf } 285da01ff7fSKevin Wolf 286da01ff7fSKevin Wolf if (job_should_pause(job) && !job_is_cancelled(job)) { 287da01ff7fSKevin Wolf JobStatus status = job->status; 288da01ff7fSKevin Wolf job_state_transition(job, status == JOB_STATUS_READY 289da01ff7fSKevin Wolf ? JOB_STATUS_STANDBY 290da01ff7fSKevin Wolf : JOB_STATUS_PAUSED); 291da01ff7fSKevin Wolf job->paused = true; 292da01ff7fSKevin Wolf job_do_yield(job, -1); 293da01ff7fSKevin Wolf job->paused = false; 294da01ff7fSKevin Wolf job_state_transition(job, status); 295da01ff7fSKevin Wolf } 296da01ff7fSKevin Wolf 297da01ff7fSKevin Wolf if (job->driver->resume) { 298da01ff7fSKevin Wolf job->driver->resume(job); 299da01ff7fSKevin Wolf } 300da01ff7fSKevin Wolf } 301da01ff7fSKevin Wolf 3025d43e86eSKevin Wolf void coroutine_fn job_sleep_ns(Job *job, int64_t ns) 3035d43e86eSKevin Wolf { 3045d43e86eSKevin Wolf assert(job->busy); 3055d43e86eSKevin Wolf 3065d43e86eSKevin Wolf /* Check cancellation *before* setting busy = false, too! */ 3075d43e86eSKevin Wolf if (job_is_cancelled(job)) { 3085d43e86eSKevin Wolf return; 3095d43e86eSKevin Wolf } 3105d43e86eSKevin Wolf 3115d43e86eSKevin Wolf if (!job_should_pause(job)) { 3125d43e86eSKevin Wolf job_do_yield(job, qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + ns); 3135d43e86eSKevin Wolf } 3145d43e86eSKevin Wolf 3155d43e86eSKevin Wolf job_pause_point(job); 3165d43e86eSKevin Wolf } 3175d43e86eSKevin Wolf 318da01ff7fSKevin Wolf /** 319da01ff7fSKevin Wolf * All jobs must allow a pause point before entering their job proper. This 320da01ff7fSKevin Wolf * ensures that jobs can be paused prior to being started, then resumed later. 321da01ff7fSKevin Wolf */ 322da01ff7fSKevin Wolf static void coroutine_fn job_co_entry(void *opaque) 323da01ff7fSKevin Wolf { 324da01ff7fSKevin Wolf Job *job = opaque; 325da01ff7fSKevin Wolf 326da01ff7fSKevin Wolf assert(job && job->driver && job->driver->start); 327da01ff7fSKevin Wolf job_pause_point(job); 328da01ff7fSKevin Wolf job->driver->start(job); 329da01ff7fSKevin Wolf } 330da01ff7fSKevin Wolf 331da01ff7fSKevin Wolf 332da01ff7fSKevin Wolf void job_start(Job *job) 333da01ff7fSKevin Wolf { 334da01ff7fSKevin Wolf assert(job && !job_started(job) && job->paused && 335da01ff7fSKevin Wolf job->driver && job->driver->start); 336da01ff7fSKevin Wolf job->co = qemu_coroutine_create(job_co_entry, job); 337da01ff7fSKevin Wolf job->pause_count--; 338da01ff7fSKevin Wolf job->busy = true; 339da01ff7fSKevin Wolf job->paused = false; 340da01ff7fSKevin Wolf job_state_transition(job, JOB_STATUS_RUNNING); 341da01ff7fSKevin Wolf aio_co_enter(job->aio_context, job->co); 342da01ff7fSKevin Wolf } 343da01ff7fSKevin Wolf 344*b15de828SKevin Wolf /* Assumes the block_job_mutex is held */ 345*b15de828SKevin Wolf static bool job_timer_not_pending(Job *job) 346*b15de828SKevin Wolf { 347*b15de828SKevin Wolf return !timer_pending(&job->sleep_timer); 348*b15de828SKevin Wolf } 349*b15de828SKevin Wolf 350*b15de828SKevin Wolf void job_pause(Job *job) 351*b15de828SKevin Wolf { 352*b15de828SKevin Wolf job->pause_count++; 353*b15de828SKevin Wolf } 354*b15de828SKevin Wolf 355*b15de828SKevin Wolf void job_resume(Job *job) 356*b15de828SKevin Wolf { 357*b15de828SKevin Wolf assert(job->pause_count > 0); 358*b15de828SKevin Wolf job->pause_count--; 359*b15de828SKevin Wolf if (job->pause_count) { 360*b15de828SKevin Wolf return; 361*b15de828SKevin Wolf } 362*b15de828SKevin Wolf 363*b15de828SKevin Wolf /* kick only if no timer is pending */ 364*b15de828SKevin Wolf job_enter_cond(job, job_timer_not_pending); 365*b15de828SKevin Wolf } 366*b15de828SKevin Wolf 367*b15de828SKevin Wolf void job_user_pause(Job *job, Error **errp) 368*b15de828SKevin Wolf { 369*b15de828SKevin Wolf if (job_apply_verb(job, JOB_VERB_PAUSE, errp)) { 370*b15de828SKevin Wolf return; 371*b15de828SKevin Wolf } 372*b15de828SKevin Wolf if (job->user_paused) { 373*b15de828SKevin Wolf error_setg(errp, "Job is already paused"); 374*b15de828SKevin Wolf return; 375*b15de828SKevin Wolf } 376*b15de828SKevin Wolf job->user_paused = true; 377*b15de828SKevin Wolf job_pause(job); 378*b15de828SKevin Wolf } 379*b15de828SKevin Wolf 380*b15de828SKevin Wolf bool job_user_paused(Job *job) 381*b15de828SKevin Wolf { 382*b15de828SKevin Wolf return job->user_paused; 383*b15de828SKevin Wolf } 384*b15de828SKevin Wolf 385*b15de828SKevin Wolf void job_user_resume(Job *job, Error **errp) 386*b15de828SKevin Wolf { 387*b15de828SKevin Wolf assert(job); 388*b15de828SKevin Wolf if (!job->user_paused || job->pause_count <= 0) { 389*b15de828SKevin Wolf error_setg(errp, "Can't resume a job that was not paused"); 390*b15de828SKevin Wolf return; 391*b15de828SKevin Wolf } 392*b15de828SKevin Wolf if (job_apply_verb(job, JOB_VERB_RESUME, errp)) { 393*b15de828SKevin Wolf return; 394*b15de828SKevin Wolf } 395*b15de828SKevin Wolf if (job->driver->user_resume) { 396*b15de828SKevin Wolf job->driver->user_resume(job); 397*b15de828SKevin Wolf } 398*b15de828SKevin Wolf job->user_paused = false; 399*b15de828SKevin Wolf job_resume(job); 400*b15de828SKevin Wolf } 401*b15de828SKevin Wolf 402*b15de828SKevin Wolf 4031908a559SKevin Wolf typedef struct { 4041908a559SKevin Wolf Job *job; 4051908a559SKevin Wolf JobDeferToMainLoopFn *fn; 4061908a559SKevin Wolf void *opaque; 4071908a559SKevin Wolf } JobDeferToMainLoopData; 4081908a559SKevin Wolf 4091908a559SKevin Wolf static void job_defer_to_main_loop_bh(void *opaque) 4101908a559SKevin Wolf { 4111908a559SKevin Wolf JobDeferToMainLoopData *data = opaque; 4121908a559SKevin Wolf Job *job = data->job; 4131908a559SKevin Wolf AioContext *aio_context = job->aio_context; 4141908a559SKevin Wolf 4151908a559SKevin Wolf aio_context_acquire(aio_context); 4161908a559SKevin Wolf data->fn(data->job, data->opaque); 4171908a559SKevin Wolf aio_context_release(aio_context); 4181908a559SKevin Wolf 4191908a559SKevin Wolf g_free(data); 4201908a559SKevin Wolf } 4211908a559SKevin Wolf 4221908a559SKevin Wolf void job_defer_to_main_loop(Job *job, JobDeferToMainLoopFn *fn, void *opaque) 4231908a559SKevin Wolf { 4241908a559SKevin Wolf JobDeferToMainLoopData *data = g_malloc(sizeof(*data)); 4251908a559SKevin Wolf data->job = job; 4261908a559SKevin Wolf data->fn = fn; 4271908a559SKevin Wolf data->opaque = opaque; 4281908a559SKevin Wolf job->deferred_to_main_loop = true; 4291908a559SKevin Wolf 4301908a559SKevin Wolf aio_bh_schedule_oneshot(qemu_get_aio_context(), 4311908a559SKevin Wolf job_defer_to_main_loop_bh, data); 4321908a559SKevin Wolf } 433