1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * pm_runtime.h - Device run-time power management helper functions. 4 * 5 * Copyright (C) 2009 Rafael J. Wysocki <[email protected]> 6 */ 7 8 #ifndef _LINUX_PM_RUNTIME_H 9 #define _LINUX_PM_RUNTIME_H 10 11 #include <linux/device.h> 12 #include <linux/notifier.h> 13 #include <linux/pm.h> 14 15 #include <linux/jiffies.h> 16 17 /* Runtime PM flag argument bits */ 18 #define RPM_ASYNC 0x01 /* Request is asynchronous */ 19 #define RPM_NOWAIT 0x02 /* Don't wait for concurrent 20 state change */ 21 #define RPM_GET_PUT 0x04 /* Increment/decrement the 22 usage_count */ 23 #define RPM_AUTO 0x08 /* Use autosuspend_delay */ 24 25 /* 26 * Use this for defining a set of PM operations to be used in all situations 27 * (system suspend, hibernation or runtime PM). 28 * 29 * Note that the behaviour differs from the deprecated UNIVERSAL_DEV_PM_OPS() 30 * macro, which uses the provided callbacks for both runtime PM and system 31 * sleep, while DEFINE_RUNTIME_DEV_PM_OPS() uses pm_runtime_force_suspend() 32 * and pm_runtime_force_resume() for its system sleep callbacks. 33 * 34 * If the underlying dev_pm_ops struct symbol has to be exported, use 35 * EXPORT_RUNTIME_DEV_PM_OPS() or EXPORT_GPL_RUNTIME_DEV_PM_OPS() instead. 36 */ 37 #define DEFINE_RUNTIME_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn) \ 38 _DEFINE_DEV_PM_OPS(name, pm_runtime_force_suspend, \ 39 pm_runtime_force_resume, suspend_fn, \ 40 resume_fn, idle_fn) 41 42 #define EXPORT_RUNTIME_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn) \ 43 _EXPORT_DEV_PM_OPS(name, pm_runtime_force_suspend, pm_runtime_force_resume, \ 44 suspend_fn, resume_fn, idle_fn, "", "") 45 #define EXPORT_GPL_RUNTIME_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn) \ 46 _EXPORT_DEV_PM_OPS(name, pm_runtime_force_suspend, pm_runtime_force_resume, \ 47 suspend_fn, resume_fn, idle_fn, "_gpl", "") 48 #define EXPORT_NS_RUNTIME_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn, ns) \ 49 _EXPORT_DEV_PM_OPS(name, pm_runtime_force_suspend, pm_runtime_force_resume, \ 50 suspend_fn, resume_fn, idle_fn, "", #ns) 51 #define EXPORT_NS_GPL_RUNTIME_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn, ns) \ 52 _EXPORT_DEV_PM_OPS(name, pm_runtime_force_suspend, pm_runtime_force_resume, \ 53 suspend_fn, resume_fn, idle_fn, "_gpl", #ns) 54 55 #ifdef CONFIG_PM 56 extern struct workqueue_struct *pm_wq; 57 58 static inline bool queue_pm_work(struct work_struct *work) 59 { 60 return queue_work(pm_wq, work); 61 } 62 63 extern int pm_generic_runtime_suspend(struct device *dev); 64 extern int pm_generic_runtime_resume(struct device *dev); 65 extern int pm_runtime_force_suspend(struct device *dev); 66 extern int pm_runtime_force_resume(struct device *dev); 67 68 extern int __pm_runtime_idle(struct device *dev, int rpmflags); 69 extern int __pm_runtime_suspend(struct device *dev, int rpmflags); 70 extern int __pm_runtime_resume(struct device *dev, int rpmflags); 71 extern int pm_runtime_get_if_active(struct device *dev, bool ign_usage_count); 72 extern int pm_schedule_suspend(struct device *dev, unsigned int delay); 73 extern int __pm_runtime_set_status(struct device *dev, unsigned int status); 74 extern int pm_runtime_barrier(struct device *dev); 75 extern void pm_runtime_enable(struct device *dev); 76 extern void __pm_runtime_disable(struct device *dev, bool check_resume); 77 extern void pm_runtime_allow(struct device *dev); 78 extern void pm_runtime_forbid(struct device *dev); 79 extern void pm_runtime_no_callbacks(struct device *dev); 80 extern void pm_runtime_irq_safe(struct device *dev); 81 extern void __pm_runtime_use_autosuspend(struct device *dev, bool use); 82 extern void pm_runtime_set_autosuspend_delay(struct device *dev, int delay); 83 extern u64 pm_runtime_autosuspend_expiration(struct device *dev); 84 extern void pm_runtime_update_max_time_suspended(struct device *dev, 85 s64 delta_ns); 86 extern void pm_runtime_set_memalloc_noio(struct device *dev, bool enable); 87 extern void pm_runtime_get_suppliers(struct device *dev); 88 extern void pm_runtime_put_suppliers(struct device *dev); 89 extern void pm_runtime_new_link(struct device *dev); 90 extern void pm_runtime_drop_link(struct device_link *link); 91 extern void pm_runtime_release_supplier(struct device_link *link, bool check_idle); 92 93 extern int devm_pm_runtime_enable(struct device *dev); 94 95 /** 96 * pm_runtime_get_if_in_use - Conditionally bump up runtime PM usage counter. 97 * @dev: Target device. 98 * 99 * Increment the runtime PM usage counter of @dev if its runtime PM status is 100 * %RPM_ACTIVE and its runtime PM usage counter is greater than 0. 101 */ 102 static inline int pm_runtime_get_if_in_use(struct device *dev) 103 { 104 return pm_runtime_get_if_active(dev, false); 105 } 106 107 /** 108 * pm_suspend_ignore_children - Set runtime PM behavior regarding children. 109 * @dev: Target device. 110 * @enable: Whether or not to ignore possible dependencies on children. 111 * 112 * The dependencies of @dev on its children will not be taken into account by 113 * the runtime PM framework going forward if @enable is %true, or they will 114 * be taken into account otherwise. 115 */ 116 static inline void pm_suspend_ignore_children(struct device *dev, bool enable) 117 { 118 dev->power.ignore_children = enable; 119 } 120 121 /** 122 * pm_runtime_get_noresume - Bump up runtime PM usage counter of a device. 123 * @dev: Target device. 124 */ 125 static inline void pm_runtime_get_noresume(struct device *dev) 126 { 127 atomic_inc(&dev->power.usage_count); 128 } 129 130 /** 131 * pm_runtime_put_noidle - Drop runtime PM usage counter of a device. 132 * @dev: Target device. 133 * 134 * Decrement the runtime PM usage counter of @dev unless it is 0 already. 135 */ 136 static inline void pm_runtime_put_noidle(struct device *dev) 137 { 138 atomic_add_unless(&dev->power.usage_count, -1, 0); 139 } 140 141 /** 142 * pm_runtime_suspended - Check whether or not a device is runtime-suspended. 143 * @dev: Target device. 144 * 145 * Return %true if runtime PM is enabled for @dev and its runtime PM status is 146 * %RPM_SUSPENDED, or %false otherwise. 147 * 148 * Note that the return value of this function can only be trusted if it is 149 * called under the runtime PM lock of @dev or under conditions in which 150 * runtime PM cannot be either disabled or enabled for @dev and its runtime PM 151 * status cannot change. 152 */ 153 static inline bool pm_runtime_suspended(struct device *dev) 154 { 155 return dev->power.runtime_status == RPM_SUSPENDED 156 && !dev->power.disable_depth; 157 } 158 159 /** 160 * pm_runtime_active - Check whether or not a device is runtime-active. 161 * @dev: Target device. 162 * 163 * Return %true if runtime PM is disabled for @dev or its runtime PM status is 164 * %RPM_ACTIVE, or %false otherwise. 165 * 166 * Note that the return value of this function can only be trusted if it is 167 * called under the runtime PM lock of @dev or under conditions in which 168 * runtime PM cannot be either disabled or enabled for @dev and its runtime PM 169 * status cannot change. 170 */ 171 static inline bool pm_runtime_active(struct device *dev) 172 { 173 return dev->power.runtime_status == RPM_ACTIVE 174 || dev->power.disable_depth; 175 } 176 177 /** 178 * pm_runtime_status_suspended - Check if runtime PM status is "suspended". 179 * @dev: Target device. 180 * 181 * Return %true if the runtime PM status of @dev is %RPM_SUSPENDED, or %false 182 * otherwise, regardless of whether or not runtime PM has been enabled for @dev. 183 * 184 * Note that the return value of this function can only be trusted if it is 185 * called under the runtime PM lock of @dev or under conditions in which the 186 * runtime PM status of @dev cannot change. 187 */ 188 static inline bool pm_runtime_status_suspended(struct device *dev) 189 { 190 return dev->power.runtime_status == RPM_SUSPENDED; 191 } 192 193 /** 194 * pm_runtime_enabled - Check if runtime PM is enabled. 195 * @dev: Target device. 196 * 197 * Return %true if runtime PM is enabled for @dev or %false otherwise. 198 * 199 * Note that the return value of this function can only be trusted if it is 200 * called under the runtime PM lock of @dev or under conditions in which 201 * runtime PM cannot be either disabled or enabled for @dev. 202 */ 203 static inline bool pm_runtime_enabled(struct device *dev) 204 { 205 return !dev->power.disable_depth; 206 } 207 208 /** 209 * pm_runtime_has_no_callbacks - Check if runtime PM callbacks may be present. 210 * @dev: Target device. 211 * 212 * Return %true if @dev is a special device without runtime PM callbacks or 213 * %false otherwise. 214 */ 215 static inline bool pm_runtime_has_no_callbacks(struct device *dev) 216 { 217 return dev->power.no_callbacks; 218 } 219 220 /** 221 * pm_runtime_mark_last_busy - Update the last access time of a device. 222 * @dev: Target device. 223 * 224 * Update the last access time of @dev used by the runtime PM autosuspend 225 * mechanism to the current time as returned by ktime_get_mono_fast_ns(). 226 */ 227 static inline void pm_runtime_mark_last_busy(struct device *dev) 228 { 229 WRITE_ONCE(dev->power.last_busy, ktime_get_mono_fast_ns()); 230 } 231 232 /** 233 * pm_runtime_is_irq_safe - Check if runtime PM can work in interrupt context. 234 * @dev: Target device. 235 * 236 * Return %true if @dev has been marked as an "IRQ-safe" device (with respect 237 * to runtime PM), in which case its runtime PM callabcks can be expected to 238 * work correctly when invoked from interrupt handlers. 239 */ 240 static inline bool pm_runtime_is_irq_safe(struct device *dev) 241 { 242 return dev->power.irq_safe; 243 } 244 245 extern u64 pm_runtime_suspended_time(struct device *dev); 246 247 #else /* !CONFIG_PM */ 248 249 static inline bool queue_pm_work(struct work_struct *work) { return false; } 250 251 static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; } 252 static inline int pm_generic_runtime_resume(struct device *dev) { return 0; } 253 static inline int pm_runtime_force_suspend(struct device *dev) { return 0; } 254 static inline int pm_runtime_force_resume(struct device *dev) { return 0; } 255 256 static inline int __pm_runtime_idle(struct device *dev, int rpmflags) 257 { 258 return -ENOSYS; 259 } 260 static inline int __pm_runtime_suspend(struct device *dev, int rpmflags) 261 { 262 return -ENOSYS; 263 } 264 static inline int __pm_runtime_resume(struct device *dev, int rpmflags) 265 { 266 return 1; 267 } 268 static inline int pm_schedule_suspend(struct device *dev, unsigned int delay) 269 { 270 return -ENOSYS; 271 } 272 static inline int pm_runtime_get_if_in_use(struct device *dev) 273 { 274 return -EINVAL; 275 } 276 static inline int pm_runtime_get_if_active(struct device *dev, 277 bool ign_usage_count) 278 { 279 return -EINVAL; 280 } 281 static inline int __pm_runtime_set_status(struct device *dev, 282 unsigned int status) { return 0; } 283 static inline int pm_runtime_barrier(struct device *dev) { return 0; } 284 static inline void pm_runtime_enable(struct device *dev) {} 285 static inline void __pm_runtime_disable(struct device *dev, bool c) {} 286 static inline void pm_runtime_allow(struct device *dev) {} 287 static inline void pm_runtime_forbid(struct device *dev) {} 288 289 static inline int devm_pm_runtime_enable(struct device *dev) { return 0; } 290 291 static inline void pm_suspend_ignore_children(struct device *dev, bool enable) {} 292 static inline void pm_runtime_get_noresume(struct device *dev) {} 293 static inline void pm_runtime_put_noidle(struct device *dev) {} 294 static inline bool pm_runtime_suspended(struct device *dev) { return false; } 295 static inline bool pm_runtime_active(struct device *dev) { return true; } 296 static inline bool pm_runtime_status_suspended(struct device *dev) { return false; } 297 static inline bool pm_runtime_enabled(struct device *dev) { return false; } 298 299 static inline void pm_runtime_no_callbacks(struct device *dev) {} 300 static inline void pm_runtime_irq_safe(struct device *dev) {} 301 static inline bool pm_runtime_is_irq_safe(struct device *dev) { return false; } 302 303 static inline bool pm_runtime_has_no_callbacks(struct device *dev) { return false; } 304 static inline void pm_runtime_mark_last_busy(struct device *dev) {} 305 static inline void __pm_runtime_use_autosuspend(struct device *dev, 306 bool use) {} 307 static inline void pm_runtime_set_autosuspend_delay(struct device *dev, 308 int delay) {} 309 static inline u64 pm_runtime_autosuspend_expiration( 310 struct device *dev) { return 0; } 311 static inline void pm_runtime_set_memalloc_noio(struct device *dev, 312 bool enable){} 313 static inline void pm_runtime_get_suppliers(struct device *dev) {} 314 static inline void pm_runtime_put_suppliers(struct device *dev) {} 315 static inline void pm_runtime_new_link(struct device *dev) {} 316 static inline void pm_runtime_drop_link(struct device_link *link) {} 317 static inline void pm_runtime_release_supplier(struct device_link *link, 318 bool check_idle) {} 319 320 #endif /* !CONFIG_PM */ 321 322 /** 323 * pm_runtime_idle - Conditionally set up autosuspend of a device or suspend it. 324 * @dev: Target device. 325 * 326 * Invoke the "idle check" callback of @dev and, depending on its return value, 327 * set up autosuspend of @dev or suspend it (depending on whether or not 328 * autosuspend has been enabled for it). 329 */ 330 static inline int pm_runtime_idle(struct device *dev) 331 { 332 return __pm_runtime_idle(dev, 0); 333 } 334 335 /** 336 * pm_runtime_suspend - Suspend a device synchronously. 337 * @dev: Target device. 338 */ 339 static inline int pm_runtime_suspend(struct device *dev) 340 { 341 return __pm_runtime_suspend(dev, 0); 342 } 343 344 /** 345 * pm_runtime_autosuspend - Set up autosuspend of a device or suspend it. 346 * @dev: Target device. 347 * 348 * Set up autosuspend of @dev or suspend it (depending on whether or not 349 * autosuspend is enabled for it) without engaging its "idle check" callback. 350 */ 351 static inline int pm_runtime_autosuspend(struct device *dev) 352 { 353 return __pm_runtime_suspend(dev, RPM_AUTO); 354 } 355 356 /** 357 * pm_runtime_resume - Resume a device synchronously. 358 * @dev: Target device. 359 */ 360 static inline int pm_runtime_resume(struct device *dev) 361 { 362 return __pm_runtime_resume(dev, 0); 363 } 364 365 /** 366 * pm_request_idle - Queue up "idle check" execution for a device. 367 * @dev: Target device. 368 * 369 * Queue up a work item to run an equivalent of pm_runtime_idle() for @dev 370 * asynchronously. 371 */ 372 static inline int pm_request_idle(struct device *dev) 373 { 374 return __pm_runtime_idle(dev, RPM_ASYNC); 375 } 376 377 /** 378 * pm_request_resume - Queue up runtime-resume of a device. 379 * @dev: Target device. 380 */ 381 static inline int pm_request_resume(struct device *dev) 382 { 383 return __pm_runtime_resume(dev, RPM_ASYNC); 384 } 385 386 /** 387 * pm_request_autosuspend - Queue up autosuspend of a device. 388 * @dev: Target device. 389 * 390 * Queue up a work item to run an equivalent pm_runtime_autosuspend() for @dev 391 * asynchronously. 392 */ 393 static inline int pm_request_autosuspend(struct device *dev) 394 { 395 return __pm_runtime_suspend(dev, RPM_ASYNC | RPM_AUTO); 396 } 397 398 /** 399 * pm_runtime_get - Bump up usage counter and queue up resume of a device. 400 * @dev: Target device. 401 * 402 * Bump up the runtime PM usage counter of @dev and queue up a work item to 403 * carry out runtime-resume of it. 404 */ 405 static inline int pm_runtime_get(struct device *dev) 406 { 407 return __pm_runtime_resume(dev, RPM_GET_PUT | RPM_ASYNC); 408 } 409 410 /** 411 * pm_runtime_get_sync - Bump up usage counter of a device and resume it. 412 * @dev: Target device. 413 * 414 * Bump up the runtime PM usage counter of @dev and carry out runtime-resume of 415 * it synchronously. 416 * 417 * The possible return values of this function are the same as for 418 * pm_runtime_resume() and the runtime PM usage counter of @dev remains 419 * incremented in all cases, even if it returns an error code. 420 * Consider using pm_runtime_resume_and_get() instead of it, especially 421 * if its return value is checked by the caller, as this is likely to result 422 * in cleaner code. 423 */ 424 static inline int pm_runtime_get_sync(struct device *dev) 425 { 426 return __pm_runtime_resume(dev, RPM_GET_PUT); 427 } 428 429 /** 430 * pm_runtime_resume_and_get - Bump up usage counter of a device and resume it. 431 * @dev: Target device. 432 * 433 * Resume @dev synchronously and if that is successful, increment its runtime 434 * PM usage counter. Return 0 if the runtime PM usage counter of @dev has been 435 * incremented or a negative error code otherwise. 436 */ 437 static inline int pm_runtime_resume_and_get(struct device *dev) 438 { 439 int ret; 440 441 ret = __pm_runtime_resume(dev, RPM_GET_PUT); 442 if (ret < 0) { 443 pm_runtime_put_noidle(dev); 444 return ret; 445 } 446 447 return 0; 448 } 449 450 /** 451 * pm_runtime_put - Drop device usage counter and queue up "idle check" if 0. 452 * @dev: Target device. 453 * 454 * Decrement the runtime PM usage counter of @dev and if it turns out to be 455 * equal to 0, queue up a work item for @dev like in pm_request_idle(). 456 */ 457 static inline int pm_runtime_put(struct device *dev) 458 { 459 return __pm_runtime_idle(dev, RPM_GET_PUT | RPM_ASYNC); 460 } 461 462 /** 463 * pm_runtime_put_autosuspend - Drop device usage counter and queue autosuspend if 0. 464 * @dev: Target device. 465 * 466 * Decrement the runtime PM usage counter of @dev and if it turns out to be 467 * equal to 0, queue up a work item for @dev like in pm_request_autosuspend(). 468 */ 469 static inline int pm_runtime_put_autosuspend(struct device *dev) 470 { 471 return __pm_runtime_suspend(dev, 472 RPM_GET_PUT | RPM_ASYNC | RPM_AUTO); 473 } 474 475 /** 476 * pm_runtime_put_sync - Drop device usage counter and run "idle check" if 0. 477 * @dev: Target device. 478 * 479 * Decrement the runtime PM usage counter of @dev and if it turns out to be 480 * equal to 0, invoke the "idle check" callback of @dev and, depending on its 481 * return value, set up autosuspend of @dev or suspend it (depending on whether 482 * or not autosuspend has been enabled for it). 483 * 484 * The possible return values of this function are the same as for 485 * pm_runtime_idle() and the runtime PM usage counter of @dev remains 486 * decremented in all cases, even if it returns an error code. 487 */ 488 static inline int pm_runtime_put_sync(struct device *dev) 489 { 490 return __pm_runtime_idle(dev, RPM_GET_PUT); 491 } 492 493 /** 494 * pm_runtime_put_sync_suspend - Drop device usage counter and suspend if 0. 495 * @dev: Target device. 496 * 497 * Decrement the runtime PM usage counter of @dev and if it turns out to be 498 * equal to 0, carry out runtime-suspend of @dev synchronously. 499 * 500 * The possible return values of this function are the same as for 501 * pm_runtime_suspend() and the runtime PM usage counter of @dev remains 502 * decremented in all cases, even if it returns an error code. 503 */ 504 static inline int pm_runtime_put_sync_suspend(struct device *dev) 505 { 506 return __pm_runtime_suspend(dev, RPM_GET_PUT); 507 } 508 509 /** 510 * pm_runtime_put_sync_autosuspend - Drop device usage counter and autosuspend if 0. 511 * @dev: Target device. 512 * 513 * Decrement the runtime PM usage counter of @dev and if it turns out to be 514 * equal to 0, set up autosuspend of @dev or suspend it synchronously (depending 515 * on whether or not autosuspend has been enabled for it). 516 * 517 * The possible return values of this function are the same as for 518 * pm_runtime_autosuspend() and the runtime PM usage counter of @dev remains 519 * decremented in all cases, even if it returns an error code. 520 */ 521 static inline int pm_runtime_put_sync_autosuspend(struct device *dev) 522 { 523 return __pm_runtime_suspend(dev, RPM_GET_PUT | RPM_AUTO); 524 } 525 526 /** 527 * pm_runtime_set_active - Set runtime PM status to "active". 528 * @dev: Target device. 529 * 530 * Set the runtime PM status of @dev to %RPM_ACTIVE and ensure that dependencies 531 * of it will be taken into account. 532 * 533 * It is not valid to call this function for devices with runtime PM enabled. 534 */ 535 static inline int pm_runtime_set_active(struct device *dev) 536 { 537 return __pm_runtime_set_status(dev, RPM_ACTIVE); 538 } 539 540 /** 541 * pm_runtime_set_suspended - Set runtime PM status to "suspended". 542 * @dev: Target device. 543 * 544 * Set the runtime PM status of @dev to %RPM_SUSPENDED and ensure that 545 * dependencies of it will be taken into account. 546 * 547 * It is not valid to call this function for devices with runtime PM enabled. 548 */ 549 static inline int pm_runtime_set_suspended(struct device *dev) 550 { 551 return __pm_runtime_set_status(dev, RPM_SUSPENDED); 552 } 553 554 /** 555 * pm_runtime_disable - Disable runtime PM for a device. 556 * @dev: Target device. 557 * 558 * Prevent the runtime PM framework from working with @dev (by incrementing its 559 * "blocking" counter). 560 * 561 * For each invocation of this function for @dev there must be a matching 562 * pm_runtime_enable() call in order for runtime PM to be enabled for it. 563 */ 564 static inline void pm_runtime_disable(struct device *dev) 565 { 566 __pm_runtime_disable(dev, true); 567 } 568 569 /** 570 * pm_runtime_use_autosuspend - Allow autosuspend to be used for a device. 571 * @dev: Target device. 572 * 573 * Allow the runtime PM autosuspend mechanism to be used for @dev whenever 574 * requested (or "autosuspend" will be handled as direct runtime-suspend for 575 * it). 576 * 577 * NOTE: It's important to undo this with pm_runtime_dont_use_autosuspend() 578 * at driver exit time unless your driver initially enabled pm_runtime 579 * with devm_pm_runtime_enable() (which handles it for you). 580 */ 581 static inline void pm_runtime_use_autosuspend(struct device *dev) 582 { 583 __pm_runtime_use_autosuspend(dev, true); 584 } 585 586 /** 587 * pm_runtime_dont_use_autosuspend - Prevent autosuspend from being used. 588 * @dev: Target device. 589 * 590 * Prevent the runtime PM autosuspend mechanism from being used for @dev which 591 * means that "autosuspend" will be handled as direct runtime-suspend for it 592 * going forward. 593 */ 594 static inline void pm_runtime_dont_use_autosuspend(struct device *dev) 595 { 596 __pm_runtime_use_autosuspend(dev, false); 597 } 598 599 #endif 600