1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991001011021031041051061071081091101111121131141151161171181191201211221231241251261271281291301311321331341351361371381391401411421431441451461471481491501511521531541551561571581591601611621631641651661671681691701711721731741751761771781791801811821831841851861871881891901911921931941951961971981992002012022032042052062072082092102112122132142152162172182192202212222232242252262272282292302312322332342352362372382392402412422432442452462472482492502512522532542552562572582592602612622632642652662672682692702712722732742752762772782792802812822832842852862872882892902912922932942952962972982993003013023033043053063073083093103113123133143153163173183193203213223233243253263273283293303313323333343353363373383393403413423433443453463473483493503513523533543553563573583593603613623633643653663673683693703713723733743753763773783793803813823833843853863873883893903913923933943953963973983994004014024034044054064074084094104114124134144154164174184194204214224234244254264274284294304314324334344354364374384394404414424434444454464474484494504514524534544554564574584594604614624634644654664674684694704714724734744754764774784794804814824834844854864874884894904914924934944954964974984995005015025035045055065075085095105115125135145155165175185195205215225235245255265275285295305315325335345355365375385395405415425435445455465475485495505515525535545555565575585595605615625635645655665675685695705715725735745755765775785795805815825835845855865875885895905915925935945955965975985996006016026036046056066076086096106116126136146156166176186196206216226236246256266276286296306316326336346356366376386396406416426436446456466476486496506516526536546556566576586596606616626636646656666676686696706716726736746756766776786796806816826836846856866876886896906916926936946956966976986997007017027037047057067077087097107117127137147157167177187197207217227237247257267277287297307317327337347357367377387397407417427437447457467477487497507517527537547557567577587597607617627637647657667677687697707717727737747757767777787797807817827837847857867877887897907917927937947957967977987998008018028038048058068078088098108118128138148158168178188198208218228238248258268278288298308318328338348358368378388398408418428438448458468478488498508518528538548558568578588598608618628638648658668678688698708718728738748758768778788798808818828838848858868878888898908918928938948958968978988999009019029039049059069079089099109119129139149159169179189199209219229239249259269279289299309319329339349359369379389399409419429439449459469479489499509519529539549559569579589599609619629639649659669679689699709719729739749759769779789799809819829839849859869879889899909919929939949959969979989991000100110021003100410051006100710081009101010111012101310141015101610171018101910201021102210231024102510261027102810291030103110321033103410351036103710381039104010411042104310441045104610471048104910501051105210531054105510561057105810591060106110621063106410651066106710681069107010711072107310741075107610771078107910801081108210831084108510861087108810891090109110921093109410951096109710981099110011011102110311041105110611071108110911101111111211131114111511161117111811191120112111221123112411251126112711281129113011311132113311341135113611371138113911401141114211431144114511461147114811491150115111521153115411551156115711581159116011611162116311641165116611671168116911701171117211731174117511761177117811791180118111821183118411851186118711881189119011911192119311941195119611971198119912001201120212031204120512061207120812091210121112121213121412151216121712181219122012211222122312241225122612271228122912301231123212331234123512361237123812391240124112421243124412451246124712481249125012511252125312541255125612571258125912601261126212631264126512661267126812691270127112721273127412751276127712781279128012811282128312841285128612871288128912901291129212931294129512961297129812991300130113021303130413051306130713081309131013111312131313141315131613171318131913201321132213231324132513261327132813291330133113321333133413351336133713381339134013411342134313441345134613471348134913501351135213531354135513561357135813591360136113621363136413651366136713681369137013711372137313741375137613771378137913801381138213831384138513861387138813891390139113921393139413951396139713981399140014011402140314041405140614071408140914101411141214131414141514161417141814191420142114221423142414251426142714281429143014311432143314341435143614371438143914401441144214431444144514461447144814491450145114521453145414551456145714581459146014611462146314641465146614671468146914701471147214731474147514761477147814791480148114821483148414851486148714881489149014911492149314941495149614971498149915001501150215031504150515061507150815091510151115121513151415151516151715181519152015211522152315241525152615271528152915301531153215331534153515361537153815391540154115421543154415451546154715481549155015511552155315541555155615571558155915601561156215631564156515661567156815691570157115721573157415751576157715781579158015811582158315841585158615871588158915901591159215931594159515961597159815991600160116021603160416051606160716081609161016111612161316141615161616171618161916201621162216231624162516261627162816291630163116321633163416351636163716381639164016411642164316441645164616471648164916501651165216531654165516561657165816591660166116621663166416651666166716681669167016711672167316741675167616771678167916801681168216831684168516861687168816891690169116921693169416951696169716981699170017011702170317041705170617071708170917101711171217131714171517161717171817191720172117221723172417251726172717281729173017311732173317341735173617371738173917401741174217431744174517461747174817491750175117521753175417551756175717581759176017611762176317641765176617671768176917701771177217731774177517761777177817791780178117821783178417851786178717881789179017911792179317941795179617971798179918001801180218031804180518061807180818091810181118121813181418151816181718181819182018211822182318241825182618271828182918301831183218331834183518361837183818391840184118421843184418451846184718481849185018511852185318541855185618571858185918601861186218631864186518661867186818691870187118721873187418751876187718781879188018811882188318841885188618871888188918901891189218931894189518961897189818991900190119021903190419051906190719081909191019111912191319141915191619171918191919201921192219231924192519261927192819291930193119321933193419351936193719381939194019411942194319441945194619471948194919501951195219531954195519561957195819591960196119621963196419651966196719681969197019711972197319741975197619771978197919801981198219831984198519861987198819891990199119921993199419951996199719981999200020012002200320042005200620072008200920102011201220132014201520162017201820192020202120222023202420252026202720282029203020312032203320342035203620372038 |
- // SPDX-License-Identifier: GPL-2.0
- /*
- * drivers/base/power/main.c - Where the driver meets power management.
- *
- * Copyright (c) 2003 Patrick Mochel
- * Copyright (c) 2003 Open Source Development Lab
- *
- * The driver model core calls device_pm_add() when a device is registered.
- * This will initialize the embedded device_pm_info object in the device
- * and add it to the list of power-controlled devices. sysfs entries for
- * controlling device power management will also be added.
- *
- * A separate list is used for keeping track of power info, because the power
- * domain dependencies may differ from the ancestral dependencies that the
- * subsystem list maintains.
- */
- #define pr_fmt(fmt) "PM: " fmt
- #define dev_fmt pr_fmt
- #include <linux/device.h>
- #include <linux/export.h>
- #include <linux/mutex.h>
- #include <linux/pm.h>
- #include <linux/pm_runtime.h>
- #include <linux/pm-trace.h>
- #include <linux/pm_wakeirq.h>
- #include <linux/interrupt.h>
- #include <linux/sched.h>
- #include <linux/sched/debug.h>
- #include <linux/async.h>
- #include <linux/suspend.h>
- #include <trace/events/power.h>
- #include <linux/cpufreq.h>
- #include <linux/devfreq.h>
- #include <linux/timer.h>
- #include <linux/wakeup_reason.h>
- #include "../base.h"
- #include "power.h"
- typedef int (*pm_callback_t)(struct device *);
- #define list_for_each_entry_rcu_locked(pos, head, member) \
- list_for_each_entry_rcu(pos, head, member, \
- device_links_read_lock_held())
- /*
- * The entries in the dpm_list list are in a depth first order, simply
- * because children are guaranteed to be discovered after parents, and
- * are inserted at the back of the list on discovery.
- *
- * Since device_pm_add() may be called with a device lock held,
- * we must never try to acquire a device lock while holding
- * dpm_list_mutex.
- */
- LIST_HEAD(dpm_list);
- static LIST_HEAD(dpm_prepared_list);
- static LIST_HEAD(dpm_suspended_list);
- static LIST_HEAD(dpm_late_early_list);
- static LIST_HEAD(dpm_noirq_list);
- struct suspend_stats suspend_stats;
- static DEFINE_MUTEX(dpm_list_mtx);
- static pm_message_t pm_transition;
- static int async_error;
- static const char *pm_verb(int event)
- {
- switch (event) {
- case PM_EVENT_SUSPEND:
- return "suspend";
- case PM_EVENT_RESUME:
- return "resume";
- case PM_EVENT_FREEZE:
- return "freeze";
- case PM_EVENT_QUIESCE:
- return "quiesce";
- case PM_EVENT_HIBERNATE:
- return "hibernate";
- case PM_EVENT_THAW:
- return "thaw";
- case PM_EVENT_RESTORE:
- return "restore";
- case PM_EVENT_RECOVER:
- return "recover";
- default:
- return "(unknown PM event)";
- }
- }
- /**
- * device_pm_sleep_init - Initialize system suspend-related device fields.
- * @dev: Device object being initialized.
- */
- void device_pm_sleep_init(struct device *dev)
- {
- dev->power.is_prepared = false;
- dev->power.is_suspended = false;
- dev->power.is_noirq_suspended = false;
- dev->power.is_late_suspended = false;
- init_completion(&dev->power.completion);
- complete_all(&dev->power.completion);
- dev->power.wakeup = NULL;
- INIT_LIST_HEAD(&dev->power.entry);
- }
- /**
- * device_pm_lock - Lock the list of active devices used by the PM core.
- */
- void device_pm_lock(void)
- {
- mutex_lock(&dpm_list_mtx);
- }
- /**
- * device_pm_unlock - Unlock the list of active devices used by the PM core.
- */
- void device_pm_unlock(void)
- {
- mutex_unlock(&dpm_list_mtx);
- }
- /**
- * device_pm_add - Add a device to the PM core's list of active devices.
- * @dev: Device to add to the list.
- */
- void device_pm_add(struct device *dev)
- {
- /* Skip PM setup/initialization. */
- if (device_pm_not_required(dev))
- return;
- pr_debug("Adding info for %s:%s\n",
- dev->bus ? dev->bus->name : "No Bus", dev_name(dev));
- device_pm_check_callbacks(dev);
- mutex_lock(&dpm_list_mtx);
- if (dev->parent && dev->parent->power.is_prepared)
- dev_warn(dev, "parent %s should not be sleeping\n",
- dev_name(dev->parent));
- list_add_tail(&dev->power.entry, &dpm_list);
- dev->power.in_dpm_list = true;
- mutex_unlock(&dpm_list_mtx);
- }
- /**
- * device_pm_remove - Remove a device from the PM core's list of active devices.
- * @dev: Device to be removed from the list.
- */
- void device_pm_remove(struct device *dev)
- {
- if (device_pm_not_required(dev))
- return;
- pr_debug("Removing info for %s:%s\n",
- dev->bus ? dev->bus->name : "No Bus", dev_name(dev));
- complete_all(&dev->power.completion);
- mutex_lock(&dpm_list_mtx);
- list_del_init(&dev->power.entry);
- dev->power.in_dpm_list = false;
- mutex_unlock(&dpm_list_mtx);
- device_wakeup_disable(dev);
- pm_runtime_remove(dev);
- device_pm_check_callbacks(dev);
- }
- /**
- * device_pm_move_before - Move device in the PM core's list of active devices.
- * @deva: Device to move in dpm_list.
- * @devb: Device @deva should come before.
- */
- void device_pm_move_before(struct device *deva, struct device *devb)
- {
- pr_debug("Moving %s:%s before %s:%s\n",
- deva->bus ? deva->bus->name : "No Bus", dev_name(deva),
- devb->bus ? devb->bus->name : "No Bus", dev_name(devb));
- /* Delete deva from dpm_list and reinsert before devb. */
- list_move_tail(&deva->power.entry, &devb->power.entry);
- }
- /**
- * device_pm_move_after - Move device in the PM core's list of active devices.
- * @deva: Device to move in dpm_list.
- * @devb: Device @deva should come after.
- */
- void device_pm_move_after(struct device *deva, struct device *devb)
- {
- pr_debug("Moving %s:%s after %s:%s\n",
- deva->bus ? deva->bus->name : "No Bus", dev_name(deva),
- devb->bus ? devb->bus->name : "No Bus", dev_name(devb));
- /* Delete deva from dpm_list and reinsert after devb. */
- list_move(&deva->power.entry, &devb->power.entry);
- }
- /**
- * device_pm_move_last - Move device to end of the PM core's list of devices.
- * @dev: Device to move in dpm_list.
- */
- void device_pm_move_last(struct device *dev)
- {
- pr_debug("Moving %s:%s to end of list\n",
- dev->bus ? dev->bus->name : "No Bus", dev_name(dev));
- list_move_tail(&dev->power.entry, &dpm_list);
- }
- static ktime_t initcall_debug_start(struct device *dev, void *cb)
- {
- if (!pm_print_times_enabled)
- return 0;
- dev_info(dev, "calling %pS @ %i, parent: %s\n", cb,
- task_pid_nr(current),
- dev->parent ? dev_name(dev->parent) : "none");
- return ktime_get();
- }
- static void initcall_debug_report(struct device *dev, ktime_t calltime,
- void *cb, int error)
- {
- ktime_t rettime;
- if (!pm_print_times_enabled)
- return;
- rettime = ktime_get();
- dev_info(dev, "%pS returned %d after %Ld usecs\n", cb, error,
- (unsigned long long)ktime_us_delta(rettime, calltime));
- }
- /**
- * dpm_wait - Wait for a PM operation to complete.
- * @dev: Device to wait for.
- * @async: If unset, wait only if the device's power.async_suspend flag is set.
- */
- static void dpm_wait(struct device *dev, bool async)
- {
- if (!dev)
- return;
- if (async || (pm_async_enabled && dev->power.async_suspend))
- wait_for_completion(&dev->power.completion);
- }
- static int dpm_wait_fn(struct device *dev, void *async_ptr)
- {
- dpm_wait(dev, *((bool *)async_ptr));
- return 0;
- }
- static void dpm_wait_for_children(struct device *dev, bool async)
- {
- device_for_each_child(dev, &async, dpm_wait_fn);
- }
- static void dpm_wait_for_suppliers(struct device *dev, bool async)
- {
- struct device_link *link;
- int idx;
- idx = device_links_read_lock();
- /*
- * If the supplier goes away right after we've checked the link to it,
- * we'll wait for its completion to change the state, but that's fine,
- * because the only things that will block as a result are the SRCU
- * callbacks freeing the link objects for the links in the list we're
- * walking.
- */
- list_for_each_entry_rcu_locked(link, &dev->links.suppliers, c_node)
- if (READ_ONCE(link->status) != DL_STATE_DORMANT)
- dpm_wait(link->supplier, async);
- device_links_read_unlock(idx);
- }
- static bool dpm_wait_for_superior(struct device *dev, bool async)
- {
- struct device *parent;
- /*
- * If the device is resumed asynchronously and the parent's callback
- * deletes both the device and the parent itself, the parent object may
- * be freed while this function is running, so avoid that by reference
- * counting the parent once more unless the device has been deleted
- * already (in which case return right away).
- */
- mutex_lock(&dpm_list_mtx);
- if (!device_pm_initialized(dev)) {
- mutex_unlock(&dpm_list_mtx);
- return false;
- }
- parent = get_device(dev->parent);
- mutex_unlock(&dpm_list_mtx);
- dpm_wait(parent, async);
- put_device(parent);
- dpm_wait_for_suppliers(dev, async);
- /*
- * If the parent's callback has deleted the device, attempting to resume
- * it would be invalid, so avoid doing that then.
- */
- return device_pm_initialized(dev);
- }
- static void dpm_wait_for_consumers(struct device *dev, bool async)
- {
- struct device_link *link;
- int idx;
- idx = device_links_read_lock();
- /*
- * The status of a device link can only be changed from "dormant" by a
- * probe, but that cannot happen during system suspend/resume. In
- * theory it can change to "dormant" at that time, but then it is
- * reasonable to wait for the target device anyway (eg. if it goes
- * away, it's better to wait for it to go away completely and then
- * continue instead of trying to continue in parallel with its
- * unregistration).
- */
- list_for_each_entry_rcu_locked(link, &dev->links.consumers, s_node)
- if (READ_ONCE(link->status) != DL_STATE_DORMANT)
- dpm_wait(link->consumer, async);
- device_links_read_unlock(idx);
- }
- static void dpm_wait_for_subordinate(struct device *dev, bool async)
- {
- dpm_wait_for_children(dev, async);
- dpm_wait_for_consumers(dev, async);
- }
- /**
- * pm_op - Return the PM operation appropriate for given PM event.
- * @ops: PM operations to choose from.
- * @state: PM transition of the system being carried out.
- */
- static pm_callback_t pm_op(const struct dev_pm_ops *ops, pm_message_t state)
- {
- switch (state.event) {
- #ifdef CONFIG_SUSPEND
- case PM_EVENT_SUSPEND:
- return ops->suspend;
- case PM_EVENT_RESUME:
- return ops->resume;
- #endif /* CONFIG_SUSPEND */
- #ifdef CONFIG_HIBERNATE_CALLBACKS
- case PM_EVENT_FREEZE:
- case PM_EVENT_QUIESCE:
- return ops->freeze;
- case PM_EVENT_HIBERNATE:
- return ops->poweroff;
- case PM_EVENT_THAW:
- case PM_EVENT_RECOVER:
- return ops->thaw;
- case PM_EVENT_RESTORE:
- return ops->restore;
- #endif /* CONFIG_HIBERNATE_CALLBACKS */
- }
- return NULL;
- }
- /**
- * pm_late_early_op - Return the PM operation appropriate for given PM event.
- * @ops: PM operations to choose from.
- * @state: PM transition of the system being carried out.
- *
- * Runtime PM is disabled for @dev while this function is being executed.
- */
- static pm_callback_t pm_late_early_op(const struct dev_pm_ops *ops,
- pm_message_t state)
- {
- switch (state.event) {
- #ifdef CONFIG_SUSPEND
- case PM_EVENT_SUSPEND:
- return ops->suspend_late;
- case PM_EVENT_RESUME:
- return ops->resume_early;
- #endif /* CONFIG_SUSPEND */
- #ifdef CONFIG_HIBERNATE_CALLBACKS
- case PM_EVENT_FREEZE:
- case PM_EVENT_QUIESCE:
- return ops->freeze_late;
- case PM_EVENT_HIBERNATE:
- return ops->poweroff_late;
- case PM_EVENT_THAW:
- case PM_EVENT_RECOVER:
- return ops->thaw_early;
- case PM_EVENT_RESTORE:
- return ops->restore_early;
- #endif /* CONFIG_HIBERNATE_CALLBACKS */
- }
- return NULL;
- }
- /**
- * pm_noirq_op - Return the PM operation appropriate for given PM event.
- * @ops: PM operations to choose from.
- * @state: PM transition of the system being carried out.
- *
- * The driver of @dev will not receive interrupts while this function is being
- * executed.
- */
- static pm_callback_t pm_noirq_op(const struct dev_pm_ops *ops, pm_message_t state)
- {
- switch (state.event) {
- #ifdef CONFIG_SUSPEND
- case PM_EVENT_SUSPEND:
- return ops->suspend_noirq;
- case PM_EVENT_RESUME:
- return ops->resume_noirq;
- #endif /* CONFIG_SUSPEND */
- #ifdef CONFIG_HIBERNATE_CALLBACKS
- case PM_EVENT_FREEZE:
- case PM_EVENT_QUIESCE:
- return ops->freeze_noirq;
- case PM_EVENT_HIBERNATE:
- return ops->poweroff_noirq;
- case PM_EVENT_THAW:
- case PM_EVENT_RECOVER:
- return ops->thaw_noirq;
- case PM_EVENT_RESTORE:
- return ops->restore_noirq;
- #endif /* CONFIG_HIBERNATE_CALLBACKS */
- }
- return NULL;
- }
- static void pm_dev_dbg(struct device *dev, pm_message_t state, const char *info)
- {
- dev_dbg(dev, "%s%s%s driver flags: %x\n", info, pm_verb(state.event),
- ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ?
- ", may wakeup" : "", dev->power.driver_flags);
- }
- static void pm_dev_err(struct device *dev, pm_message_t state, const char *info,
- int error)
- {
- dev_err(dev, "failed to %s%s: error %d\n", pm_verb(state.event), info,
- error);
- }
- static void dpm_show_time(ktime_t starttime, pm_message_t state, int error,
- const char *info)
- {
- ktime_t calltime;
- u64 usecs64;
- int usecs;
- calltime = ktime_get();
- usecs64 = ktime_to_ns(ktime_sub(calltime, starttime));
- do_div(usecs64, NSEC_PER_USEC);
- usecs = usecs64;
- if (usecs == 0)
- usecs = 1;
- pm_pr_dbg("%s%s%s of devices %s after %ld.%03ld msecs\n",
- info ?: "", info ? " " : "", pm_verb(state.event),
- error ? "aborted" : "complete",
- usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC);
- }
- static int dpm_run_callback(pm_callback_t cb, struct device *dev,
- pm_message_t state, const char *info)
- {
- ktime_t calltime;
- int error;
- if (!cb)
- return 0;
- calltime = initcall_debug_start(dev, cb);
- pm_dev_dbg(dev, state, info);
- trace_device_pm_callback_start(dev, info, state.event);
- error = cb(dev);
- trace_device_pm_callback_end(dev, error);
- suspend_report_result(dev, cb, error);
- initcall_debug_report(dev, calltime, cb, error);
- return error;
- }
- #ifdef CONFIG_DPM_WATCHDOG
- struct dpm_watchdog {
- struct device *dev;
- struct task_struct *tsk;
- struct timer_list timer;
- };
- #define DECLARE_DPM_WATCHDOG_ON_STACK(wd) \
- struct dpm_watchdog wd
- /**
- * dpm_watchdog_handler - Driver suspend / resume watchdog handler.
- * @t: The timer that PM watchdog depends on.
- *
- * Called when a driver has timed out suspending or resuming.
- * There's not much we can do here to recover so panic() to
- * capture a crash-dump in pstore.
- */
- static void dpm_watchdog_handler(struct timer_list *t)
- {
- struct dpm_watchdog *wd = from_timer(wd, t, timer);
- dev_emerg(wd->dev, "**** DPM device timeout ****\n");
- show_stack(wd->tsk, NULL, KERN_EMERG);
- panic("%s %s: unrecoverable failure\n",
- dev_driver_string(wd->dev), dev_name(wd->dev));
- }
- /**
- * dpm_watchdog_set - Enable pm watchdog for given device.
- * @wd: Watchdog. Must be allocated on the stack.
- * @dev: Device to handle.
- */
- static void dpm_watchdog_set(struct dpm_watchdog *wd, struct device *dev)
- {
- struct timer_list *timer = &wd->timer;
- wd->dev = dev;
- wd->tsk = current;
- timer_setup_on_stack(timer, dpm_watchdog_handler, 0);
- /* use same timeout value for both suspend and resume */
- timer->expires = jiffies + HZ * CONFIG_DPM_WATCHDOG_TIMEOUT;
- add_timer(timer);
- }
- /**
- * dpm_watchdog_clear - Disable suspend/resume watchdog.
- * @wd: Watchdog to disable.
- */
- static void dpm_watchdog_clear(struct dpm_watchdog *wd)
- {
- struct timer_list *timer = &wd->timer;
- del_timer_sync(timer);
- destroy_timer_on_stack(timer);
- }
- #else
- #define DECLARE_DPM_WATCHDOG_ON_STACK(wd)
- #define dpm_watchdog_set(x, y)
- #define dpm_watchdog_clear(x)
- #endif
- /*------------------------- Resume routines -------------------------*/
- /**
- * dev_pm_skip_resume - System-wide device resume optimization check.
- * @dev: Target device.
- *
- * Return:
- * - %false if the transition under way is RESTORE.
- * - Return value of dev_pm_skip_suspend() if the transition under way is THAW.
- * - The logical negation of %power.must_resume otherwise (that is, when the
- * transition under way is RESUME).
- */
- bool dev_pm_skip_resume(struct device *dev)
- {
- if (pm_transition.event == PM_EVENT_RESTORE)
- return false;
- if (pm_transition.event == PM_EVENT_THAW)
- return dev_pm_skip_suspend(dev);
- return !dev->power.must_resume;
- }
- /**
- * __device_resume_noirq - Execute a "noirq resume" callback for given device.
- * @dev: Device to handle.
- * @state: PM transition of the system being carried out.
- * @async: If true, the device is being resumed asynchronously.
- *
- * The driver of @dev will not receive interrupts while this function is being
- * executed.
- */
- static void __device_resume_noirq(struct device *dev, pm_message_t state, bool async)
- {
- pm_callback_t callback = NULL;
- const char *info = NULL;
- bool skip_resume;
- int error = 0;
- TRACE_DEVICE(dev);
- TRACE_RESUME(0);
- if (dev->power.syscore || dev->power.direct_complete)
- goto Out;
- if (!dev->power.is_noirq_suspended)
- goto Out;
- if (!dpm_wait_for_superior(dev, async))
- goto Out;
- skip_resume = dev_pm_skip_resume(dev);
- /*
- * If the driver callback is skipped below or by the middle layer
- * callback and device_resume_early() also skips the driver callback for
- * this device later, it needs to appear as "suspended" to PM-runtime,
- * so change its status accordingly.
- *
- * Otherwise, the device is going to be resumed, so set its PM-runtime
- * status to "active", but do that only if DPM_FLAG_SMART_SUSPEND is set
- * to avoid confusing drivers that don't use it.
- */
- if (skip_resume)
- pm_runtime_set_suspended(dev);
- else if (dev_pm_skip_suspend(dev))
- pm_runtime_set_active(dev);
- if (dev->pm_domain) {
- info = "noirq power domain ";
- callback = pm_noirq_op(&dev->pm_domain->ops, state);
- } else if (dev->type && dev->type->pm) {
- info = "noirq type ";
- callback = pm_noirq_op(dev->type->pm, state);
- } else if (dev->class && dev->class->pm) {
- info = "noirq class ";
- callback = pm_noirq_op(dev->class->pm, state);
- } else if (dev->bus && dev->bus->pm) {
- info = "noirq bus ";
- callback = pm_noirq_op(dev->bus->pm, state);
- }
- if (callback)
- goto Run;
- if (skip_resume)
- goto Skip;
- if (dev->driver && dev->driver->pm) {
- info = "noirq driver ";
- callback = pm_noirq_op(dev->driver->pm, state);
- }
- Run:
- error = dpm_run_callback(callback, dev, state, info);
- Skip:
- dev->power.is_noirq_suspended = false;
- Out:
- complete_all(&dev->power.completion);
- TRACE_RESUME(error);
- if (error) {
- suspend_stats.failed_resume_noirq++;
- dpm_save_failed_step(SUSPEND_RESUME_NOIRQ);
- dpm_save_failed_dev(dev_name(dev));
- pm_dev_err(dev, state, async ? " async noirq" : " noirq", error);
- }
- }
- static bool is_async(struct device *dev)
- {
- return dev->power.async_suspend && pm_async_enabled
- && !pm_trace_is_enabled();
- }
- static bool dpm_async_fn(struct device *dev, async_func_t func)
- {
- reinit_completion(&dev->power.completion);
- if (!is_async(dev))
- return false;
- get_device(dev);
- if (async_schedule_dev_nocall(func, dev))
- return true;
- put_device(dev);
- return false;
- }
- static void async_resume_noirq(void *data, async_cookie_t cookie)
- {
- struct device *dev = (struct device *)data;
- __device_resume_noirq(dev, pm_transition, true);
- put_device(dev);
- }
- static void device_resume_noirq(struct device *dev)
- {
- if (dpm_async_fn(dev, async_resume_noirq))
- return;
- __device_resume_noirq(dev, pm_transition, false);
- }
- static void dpm_noirq_resume_devices(pm_message_t state)
- {
- struct device *dev;
- ktime_t starttime = ktime_get();
- trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, true);
- mutex_lock(&dpm_list_mtx);
- pm_transition = state;
- while (!list_empty(&dpm_noirq_list)) {
- dev = to_device(dpm_noirq_list.next);
- get_device(dev);
- list_move_tail(&dev->power.entry, &dpm_late_early_list);
- mutex_unlock(&dpm_list_mtx);
- device_resume_noirq(dev);
- put_device(dev);
- mutex_lock(&dpm_list_mtx);
- }
- mutex_unlock(&dpm_list_mtx);
- async_synchronize_full();
- dpm_show_time(starttime, state, 0, "noirq");
- trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, false);
- }
- /**
- * dpm_resume_noirq - Execute "noirq resume" callbacks for all devices.
- * @state: PM transition of the system being carried out.
- *
- * Invoke the "noirq" resume callbacks for all devices in dpm_noirq_list and
- * allow device drivers' interrupt handlers to be called.
- */
- void dpm_resume_noirq(pm_message_t state)
- {
- dpm_noirq_resume_devices(state);
- resume_device_irqs();
- device_wakeup_disarm_wake_irqs();
- }
- /**
- * __device_resume_early - Execute an "early resume" callback for given device.
- * @dev: Device to handle.
- * @state: PM transition of the system being carried out.
- * @async: If true, the device is being resumed asynchronously.
- *
- * Runtime PM is disabled for @dev while this function is being executed.
- */
- static void __device_resume_early(struct device *dev, pm_message_t state, bool async)
- {
- pm_callback_t callback = NULL;
- const char *info = NULL;
- int error = 0;
- TRACE_DEVICE(dev);
- TRACE_RESUME(0);
- if (dev->power.syscore || dev->power.direct_complete)
- goto Out;
- if (!dev->power.is_late_suspended)
- goto Out;
- if (!dpm_wait_for_superior(dev, async))
- goto Out;
- if (dev->pm_domain) {
- info = "early power domain ";
- callback = pm_late_early_op(&dev->pm_domain->ops, state);
- } else if (dev->type && dev->type->pm) {
- info = "early type ";
- callback = pm_late_early_op(dev->type->pm, state);
- } else if (dev->class && dev->class->pm) {
- info = "early class ";
- callback = pm_late_early_op(dev->class->pm, state);
- } else if (dev->bus && dev->bus->pm) {
- info = "early bus ";
- callback = pm_late_early_op(dev->bus->pm, state);
- }
- if (callback)
- goto Run;
- if (dev_pm_skip_resume(dev))
- goto Skip;
- if (dev->driver && dev->driver->pm) {
- info = "early driver ";
- callback = pm_late_early_op(dev->driver->pm, state);
- }
- Run:
- error = dpm_run_callback(callback, dev, state, info);
- Skip:
- dev->power.is_late_suspended = false;
- Out:
- TRACE_RESUME(error);
- pm_runtime_enable(dev);
- complete_all(&dev->power.completion);
- if (error) {
- suspend_stats.failed_resume_early++;
- dpm_save_failed_step(SUSPEND_RESUME_EARLY);
- dpm_save_failed_dev(dev_name(dev));
- pm_dev_err(dev, state, async ? " async early" : " early", error);
- }
- }
- static void async_resume_early(void *data, async_cookie_t cookie)
- {
- struct device *dev = (struct device *)data;
- __device_resume_early(dev, pm_transition, true);
- put_device(dev);
- }
- static void device_resume_early(struct device *dev)
- {
- if (dpm_async_fn(dev, async_resume_early))
- return;
- __device_resume_early(dev, pm_transition, false);
- }
- /**
- * dpm_resume_early - Execute "early resume" callbacks for all devices.
- * @state: PM transition of the system being carried out.
- */
- void dpm_resume_early(pm_message_t state)
- {
- struct device *dev;
- ktime_t starttime = ktime_get();
- trace_suspend_resume(TPS("dpm_resume_early"), state.event, true);
- mutex_lock(&dpm_list_mtx);
- pm_transition = state;
- while (!list_empty(&dpm_late_early_list)) {
- dev = to_device(dpm_late_early_list.next);
- get_device(dev);
- list_move_tail(&dev->power.entry, &dpm_suspended_list);
- mutex_unlock(&dpm_list_mtx);
- device_resume_early(dev);
- put_device(dev);
- mutex_lock(&dpm_list_mtx);
- }
- mutex_unlock(&dpm_list_mtx);
- async_synchronize_full();
- dpm_show_time(starttime, state, 0, "early");
- trace_suspend_resume(TPS("dpm_resume_early"), state.event, false);
- }
- /**
- * dpm_resume_start - Execute "noirq" and "early" device callbacks.
- * @state: PM transition of the system being carried out.
- */
- void dpm_resume_start(pm_message_t state)
- {
- dpm_resume_noirq(state);
- dpm_resume_early(state);
- }
- EXPORT_SYMBOL_GPL(dpm_resume_start);
- /**
- * __device_resume - Execute "resume" callbacks for given device.
- * @dev: Device to handle.
- * @state: PM transition of the system being carried out.
- * @async: If true, the device is being resumed asynchronously.
- */
- static void __device_resume(struct device *dev, pm_message_t state, bool async)
- {
- pm_callback_t callback = NULL;
- const char *info = NULL;
- int error = 0;
- DECLARE_DPM_WATCHDOG_ON_STACK(wd);
- TRACE_DEVICE(dev);
- TRACE_RESUME(0);
- if (dev->power.syscore)
- goto Complete;
- if (dev->power.direct_complete) {
- /* Match the pm_runtime_disable() in __device_suspend(). */
- pm_runtime_enable(dev);
- goto Complete;
- }
- if (!dpm_wait_for_superior(dev, async))
- goto Complete;
- dpm_watchdog_set(&wd, dev);
- device_lock(dev);
- /*
- * This is a fib. But we'll allow new children to be added below
- * a resumed device, even if the device hasn't been completed yet.
- */
- dev->power.is_prepared = false;
- if (!dev->power.is_suspended)
- goto Unlock;
- if (dev->pm_domain) {
- info = "power domain ";
- callback = pm_op(&dev->pm_domain->ops, state);
- goto Driver;
- }
- if (dev->type && dev->type->pm) {
- info = "type ";
- callback = pm_op(dev->type->pm, state);
- goto Driver;
- }
- if (dev->class && dev->class->pm) {
- info = "class ";
- callback = pm_op(dev->class->pm, state);
- goto Driver;
- }
- if (dev->bus) {
- if (dev->bus->pm) {
- info = "bus ";
- callback = pm_op(dev->bus->pm, state);
- } else if (dev->bus->resume) {
- info = "legacy bus ";
- callback = dev->bus->resume;
- goto End;
- }
- }
- Driver:
- if (!callback && dev->driver && dev->driver->pm) {
- info = "driver ";
- callback = pm_op(dev->driver->pm, state);
- }
- End:
- error = dpm_run_callback(callback, dev, state, info);
- dev->power.is_suspended = false;
- Unlock:
- device_unlock(dev);
- dpm_watchdog_clear(&wd);
- Complete:
- complete_all(&dev->power.completion);
- TRACE_RESUME(error);
- if (error) {
- suspend_stats.failed_resume++;
- dpm_save_failed_step(SUSPEND_RESUME);
- dpm_save_failed_dev(dev_name(dev));
- pm_dev_err(dev, state, async ? " async" : "", error);
- }
- }
- static void async_resume(void *data, async_cookie_t cookie)
- {
- struct device *dev = (struct device *)data;
- __device_resume(dev, pm_transition, true);
- put_device(dev);
- }
- static void device_resume(struct device *dev)
- {
- if (dpm_async_fn(dev, async_resume))
- return;
- __device_resume(dev, pm_transition, false);
- }
- /**
- * dpm_resume - Execute "resume" callbacks for non-sysdev devices.
- * @state: PM transition of the system being carried out.
- *
- * Execute the appropriate "resume" callback for all devices whose status
- * indicates that they are suspended.
- */
- void dpm_resume(pm_message_t state)
- {
- struct device *dev;
- ktime_t starttime = ktime_get();
- trace_suspend_resume(TPS("dpm_resume"), state.event, true);
- might_sleep();
- mutex_lock(&dpm_list_mtx);
- pm_transition = state;
- async_error = 0;
- while (!list_empty(&dpm_suspended_list)) {
- dev = to_device(dpm_suspended_list.next);
- get_device(dev);
- mutex_unlock(&dpm_list_mtx);
- device_resume(dev);
- mutex_lock(&dpm_list_mtx);
- if (!list_empty(&dev->power.entry))
- list_move_tail(&dev->power.entry, &dpm_prepared_list);
- mutex_unlock(&dpm_list_mtx);
- put_device(dev);
- mutex_lock(&dpm_list_mtx);
- }
- mutex_unlock(&dpm_list_mtx);
- async_synchronize_full();
- dpm_show_time(starttime, state, 0, NULL);
- cpufreq_resume();
- devfreq_resume();
- trace_suspend_resume(TPS("dpm_resume"), state.event, false);
- }
- /**
- * device_complete - Complete a PM transition for given device.
- * @dev: Device to handle.
- * @state: PM transition of the system being carried out.
- */
- static void device_complete(struct device *dev, pm_message_t state)
- {
- void (*callback)(struct device *) = NULL;
- const char *info = NULL;
- if (dev->power.syscore)
- goto out;
- device_lock(dev);
- if (dev->pm_domain) {
- info = "completing power domain ";
- callback = dev->pm_domain->ops.complete;
- } else if (dev->type && dev->type->pm) {
- info = "completing type ";
- callback = dev->type->pm->complete;
- } else if (dev->class && dev->class->pm) {
- info = "completing class ";
- callback = dev->class->pm->complete;
- } else if (dev->bus && dev->bus->pm) {
- info = "completing bus ";
- callback = dev->bus->pm->complete;
- }
- if (!callback && dev->driver && dev->driver->pm) {
- info = "completing driver ";
- callback = dev->driver->pm->complete;
- }
- if (callback) {
- pm_dev_dbg(dev, state, info);
- callback(dev);
- }
- device_unlock(dev);
- out:
- pm_runtime_put(dev);
- }
- /**
- * dpm_complete - Complete a PM transition for all non-sysdev devices.
- * @state: PM transition of the system being carried out.
- *
- * Execute the ->complete() callbacks for all devices whose PM status is not
- * DPM_ON (this allows new devices to be registered).
- */
- void dpm_complete(pm_message_t state)
- {
- struct list_head list;
- trace_suspend_resume(TPS("dpm_complete"), state.event, true);
- might_sleep();
- INIT_LIST_HEAD(&list);
- mutex_lock(&dpm_list_mtx);
- while (!list_empty(&dpm_prepared_list)) {
- struct device *dev = to_device(dpm_prepared_list.prev);
- get_device(dev);
- dev->power.is_prepared = false;
- list_move(&dev->power.entry, &list);
- mutex_unlock(&dpm_list_mtx);
- trace_device_pm_callback_start(dev, "", state.event);
- device_complete(dev, state);
- trace_device_pm_callback_end(dev, 0);
- put_device(dev);
- mutex_lock(&dpm_list_mtx);
- }
- list_splice(&list, &dpm_list);
- mutex_unlock(&dpm_list_mtx);
- /* Allow device probing and trigger re-probing of deferred devices */
- device_unblock_probing();
- trace_suspend_resume(TPS("dpm_complete"), state.event, false);
- }
- /**
- * dpm_resume_end - Execute "resume" callbacks and complete system transition.
- * @state: PM transition of the system being carried out.
- *
- * Execute "resume" callbacks for all devices and complete the PM transition of
- * the system.
- */
- void dpm_resume_end(pm_message_t state)
- {
- dpm_resume(state);
- dpm_complete(state);
- }
- EXPORT_SYMBOL_GPL(dpm_resume_end);
- /*------------------------- Suspend routines -------------------------*/
- /**
- * resume_event - Return a "resume" message for given "suspend" sleep state.
- * @sleep_state: PM message representing a sleep state.
- *
- * Return a PM message representing the resume event corresponding to given
- * sleep state.
- */
- static pm_message_t resume_event(pm_message_t sleep_state)
- {
- switch (sleep_state.event) {
- case PM_EVENT_SUSPEND:
- return PMSG_RESUME;
- case PM_EVENT_FREEZE:
- case PM_EVENT_QUIESCE:
- return PMSG_RECOVER;
- case PM_EVENT_HIBERNATE:
- return PMSG_RESTORE;
- }
- return PMSG_ON;
- }
- static void dpm_superior_set_must_resume(struct device *dev)
- {
- struct device_link *link;
- int idx;
- if (dev->parent)
- dev->parent->power.must_resume = true;
- idx = device_links_read_lock();
- list_for_each_entry_rcu_locked(link, &dev->links.suppliers, c_node)
- link->supplier->power.must_resume = true;
- device_links_read_unlock(idx);
- }
- /**
- * __device_suspend_noirq - Execute a "noirq suspend" callback for given device.
- * @dev: Device to handle.
- * @state: PM transition of the system being carried out.
- * @async: If true, the device is being suspended asynchronously.
- *
- * The driver of @dev will not receive interrupts while this function is being
- * executed.
- */
- static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool async)
- {
- pm_callback_t callback = NULL;
- const char *info = NULL;
- int error = 0;
- TRACE_DEVICE(dev);
- TRACE_SUSPEND(0);
- dpm_wait_for_subordinate(dev, async);
- if (async_error)
- goto Complete;
- if (dev->power.syscore || dev->power.direct_complete)
- goto Complete;
- if (dev->pm_domain) {
- info = "noirq power domain ";
- callback = pm_noirq_op(&dev->pm_domain->ops, state);
- } else if (dev->type && dev->type->pm) {
- info = "noirq type ";
- callback = pm_noirq_op(dev->type->pm, state);
- } else if (dev->class && dev->class->pm) {
- info = "noirq class ";
- callback = pm_noirq_op(dev->class->pm, state);
- } else if (dev->bus && dev->bus->pm) {
- info = "noirq bus ";
- callback = pm_noirq_op(dev->bus->pm, state);
- }
- if (callback)
- goto Run;
- if (dev_pm_skip_suspend(dev))
- goto Skip;
- if (dev->driver && dev->driver->pm) {
- info = "noirq driver ";
- callback = pm_noirq_op(dev->driver->pm, state);
- }
- Run:
- error = dpm_run_callback(callback, dev, state, info);
- if (error) {
- async_error = error;
- log_suspend_abort_reason("Device %s failed to %s noirq: error %d",
- dev_name(dev), pm_verb(state.event), error);
- goto Complete;
- }
- Skip:
- dev->power.is_noirq_suspended = true;
- /*
- * Skipping the resume of devices that were in use right before the
- * system suspend (as indicated by their PM-runtime usage counters)
- * would be suboptimal. Also resume them if doing that is not allowed
- * to be skipped.
- */
- if (atomic_read(&dev->power.usage_count) > 1 ||
- !(dev_pm_test_driver_flags(dev, DPM_FLAG_MAY_SKIP_RESUME) &&
- dev->power.may_skip_resume))
- dev->power.must_resume = true;
- if (dev->power.must_resume)
- dpm_superior_set_must_resume(dev);
- Complete:
- complete_all(&dev->power.completion);
- TRACE_SUSPEND(error);
- return error;
- }
- static void async_suspend_noirq(void *data, async_cookie_t cookie)
- {
- struct device *dev = (struct device *)data;
- int error;
- error = __device_suspend_noirq(dev, pm_transition, true);
- if (error) {
- dpm_save_failed_dev(dev_name(dev));
- pm_dev_err(dev, pm_transition, " async", error);
- }
- put_device(dev);
- }
- static int device_suspend_noirq(struct device *dev)
- {
- if (dpm_async_fn(dev, async_suspend_noirq))
- return 0;
- return __device_suspend_noirq(dev, pm_transition, false);
- }
- static int dpm_noirq_suspend_devices(pm_message_t state)
- {
- ktime_t starttime = ktime_get();
- int error = 0;
- trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, true);
- mutex_lock(&dpm_list_mtx);
- pm_transition = state;
- async_error = 0;
- while (!list_empty(&dpm_late_early_list)) {
- struct device *dev = to_device(dpm_late_early_list.prev);
- get_device(dev);
- mutex_unlock(&dpm_list_mtx);
- error = device_suspend_noirq(dev);
- mutex_lock(&dpm_list_mtx);
- if (error) {
- pm_dev_err(dev, state, " noirq", error);
- dpm_save_failed_dev(dev_name(dev));
- } else if (!list_empty(&dev->power.entry)) {
- list_move(&dev->power.entry, &dpm_noirq_list);
- }
- mutex_unlock(&dpm_list_mtx);
- put_device(dev);
- mutex_lock(&dpm_list_mtx);
- if (error || async_error)
- break;
- }
- mutex_unlock(&dpm_list_mtx);
- async_synchronize_full();
- if (!error)
- error = async_error;
- if (error) {
- suspend_stats.failed_suspend_noirq++;
- dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ);
- }
- dpm_show_time(starttime, state, error, "noirq");
- trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, false);
- return error;
- }
- /**
- * dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices.
- * @state: PM transition of the system being carried out.
- *
- * Prevent device drivers' interrupt handlers from being called and invoke
- * "noirq" suspend callbacks for all non-sysdev devices.
- */
- int dpm_suspend_noirq(pm_message_t state)
- {
- int ret;
- device_wakeup_arm_wake_irqs();
- suspend_device_irqs();
- ret = dpm_noirq_suspend_devices(state);
- if (ret)
- dpm_resume_noirq(resume_event(state));
- return ret;
- }
- static void dpm_propagate_wakeup_to_parent(struct device *dev)
- {
- struct device *parent = dev->parent;
- if (!parent)
- return;
- spin_lock_irq(&parent->power.lock);
- if (device_wakeup_path(dev) && !parent->power.ignore_children)
- parent->power.wakeup_path = true;
- spin_unlock_irq(&parent->power.lock);
- }
- /**
- * __device_suspend_late - Execute a "late suspend" callback for given device.
- * @dev: Device to handle.
- * @state: PM transition of the system being carried out.
- * @async: If true, the device is being suspended asynchronously.
- *
- * Runtime PM is disabled for @dev while this function is being executed.
- */
- static int __device_suspend_late(struct device *dev, pm_message_t state, bool async)
- {
- pm_callback_t callback = NULL;
- const char *info = NULL;
- int error = 0;
- TRACE_DEVICE(dev);
- TRACE_SUSPEND(0);
- __pm_runtime_disable(dev, false);
- dpm_wait_for_subordinate(dev, async);
- if (async_error)
- goto Complete;
- if (pm_wakeup_pending()) {
- async_error = -EBUSY;
- goto Complete;
- }
- if (dev->power.syscore || dev->power.direct_complete)
- goto Complete;
- if (dev->pm_domain) {
- info = "late power domain ";
- callback = pm_late_early_op(&dev->pm_domain->ops, state);
- } else if (dev->type && dev->type->pm) {
- info = "late type ";
- callback = pm_late_early_op(dev->type->pm, state);
- } else if (dev->class && dev->class->pm) {
- info = "late class ";
- callback = pm_late_early_op(dev->class->pm, state);
- } else if (dev->bus && dev->bus->pm) {
- info = "late bus ";
- callback = pm_late_early_op(dev->bus->pm, state);
- }
- if (callback)
- goto Run;
- if (dev_pm_skip_suspend(dev))
- goto Skip;
- if (dev->driver && dev->driver->pm) {
- info = "late driver ";
- callback = pm_late_early_op(dev->driver->pm, state);
- }
- Run:
- error = dpm_run_callback(callback, dev, state, info);
- if (error) {
- async_error = error;
- log_suspend_abort_reason("Device %s failed to %s late: error %d",
- dev_name(dev), pm_verb(state.event), error);
- goto Complete;
- }
- dpm_propagate_wakeup_to_parent(dev);
- Skip:
- dev->power.is_late_suspended = true;
- Complete:
- TRACE_SUSPEND(error);
- complete_all(&dev->power.completion);
- return error;
- }
- static void async_suspend_late(void *data, async_cookie_t cookie)
- {
- struct device *dev = (struct device *)data;
- int error;
- error = __device_suspend_late(dev, pm_transition, true);
- if (error) {
- dpm_save_failed_dev(dev_name(dev));
- pm_dev_err(dev, pm_transition, " async", error);
- }
- put_device(dev);
- }
- static int device_suspend_late(struct device *dev)
- {
- if (dpm_async_fn(dev, async_suspend_late))
- return 0;
- return __device_suspend_late(dev, pm_transition, false);
- }
- /**
- * dpm_suspend_late - Execute "late suspend" callbacks for all devices.
- * @state: PM transition of the system being carried out.
- */
- int dpm_suspend_late(pm_message_t state)
- {
- ktime_t starttime = ktime_get();
- int error = 0;
- trace_suspend_resume(TPS("dpm_suspend_late"), state.event, true);
- wake_up_all_idle_cpus();
- mutex_lock(&dpm_list_mtx);
- pm_transition = state;
- async_error = 0;
- while (!list_empty(&dpm_suspended_list)) {
- struct device *dev = to_device(dpm_suspended_list.prev);
- get_device(dev);
- mutex_unlock(&dpm_list_mtx);
- error = device_suspend_late(dev);
- mutex_lock(&dpm_list_mtx);
- if (!list_empty(&dev->power.entry))
- list_move(&dev->power.entry, &dpm_late_early_list);
- if (error) {
- pm_dev_err(dev, state, " late", error);
- dpm_save_failed_dev(dev_name(dev));
- }
- mutex_unlock(&dpm_list_mtx);
- put_device(dev);
- mutex_lock(&dpm_list_mtx);
- if (error || async_error)
- break;
- }
- mutex_unlock(&dpm_list_mtx);
- async_synchronize_full();
- if (!error)
- error = async_error;
- if (error) {
- suspend_stats.failed_suspend_late++;
- dpm_save_failed_step(SUSPEND_SUSPEND_LATE);
- dpm_resume_early(resume_event(state));
- }
- dpm_show_time(starttime, state, error, "late");
- trace_suspend_resume(TPS("dpm_suspend_late"), state.event, false);
- return error;
- }
- /**
- * dpm_suspend_end - Execute "late" and "noirq" device suspend callbacks.
- * @state: PM transition of the system being carried out.
- */
- int dpm_suspend_end(pm_message_t state)
- {
- ktime_t starttime = ktime_get();
- int error;
- error = dpm_suspend_late(state);
- if (error)
- goto out;
- error = dpm_suspend_noirq(state);
- if (error)
- dpm_resume_early(resume_event(state));
- out:
- dpm_show_time(starttime, state, error, "end");
- return error;
- }
- EXPORT_SYMBOL_GPL(dpm_suspend_end);
- /**
- * legacy_suspend - Execute a legacy (bus or class) suspend callback for device.
- * @dev: Device to suspend.
- * @state: PM transition of the system being carried out.
- * @cb: Suspend callback to execute.
- * @info: string description of caller.
- */
- static int legacy_suspend(struct device *dev, pm_message_t state,
- int (*cb)(struct device *dev, pm_message_t state),
- const char *info)
- {
- int error;
- ktime_t calltime;
- calltime = initcall_debug_start(dev, cb);
- trace_device_pm_callback_start(dev, info, state.event);
- error = cb(dev, state);
- trace_device_pm_callback_end(dev, error);
- suspend_report_result(dev, cb, error);
- initcall_debug_report(dev, calltime, cb, error);
- return error;
- }
- static void dpm_clear_superiors_direct_complete(struct device *dev)
- {
- struct device_link *link;
- int idx;
- if (dev->parent) {
- spin_lock_irq(&dev->parent->power.lock);
- dev->parent->power.direct_complete = false;
- spin_unlock_irq(&dev->parent->power.lock);
- }
- idx = device_links_read_lock();
- list_for_each_entry_rcu_locked(link, &dev->links.suppliers, c_node) {
- spin_lock_irq(&link->supplier->power.lock);
- link->supplier->power.direct_complete = false;
- spin_unlock_irq(&link->supplier->power.lock);
- }
- device_links_read_unlock(idx);
- }
- /**
- * __device_suspend - Execute "suspend" callbacks for given device.
- * @dev: Device to handle.
- * @state: PM transition of the system being carried out.
- * @async: If true, the device is being suspended asynchronously.
- */
- static int __device_suspend(struct device *dev, pm_message_t state, bool async)
- {
- pm_callback_t callback = NULL;
- const char *info = NULL;
- int error = 0;
- DECLARE_DPM_WATCHDOG_ON_STACK(wd);
- TRACE_DEVICE(dev);
- TRACE_SUSPEND(0);
- dpm_wait_for_subordinate(dev, async);
- if (async_error) {
- dev->power.direct_complete = false;
- goto Complete;
- }
- /*
- * Wait for possible runtime PM transitions of the device in progress
- * to complete and if there's a runtime resume request pending for it,
- * resume it before proceeding with invoking the system-wide suspend
- * callbacks for it.
- *
- * If the system-wide suspend callbacks below change the configuration
- * of the device, they must disable runtime PM for it or otherwise
- * ensure that its runtime-resume callbacks will not be confused by that
- * change in case they are invoked going forward.
- */
- pm_runtime_barrier(dev);
- if (pm_wakeup_pending()) {
- dev->power.direct_complete = false;
- async_error = -EBUSY;
- goto Complete;
- }
- if (dev->power.syscore)
- goto Complete;
- /* Avoid direct_complete to let wakeup_path propagate. */
- if (device_may_wakeup(dev) || device_wakeup_path(dev))
- dev->power.direct_complete = false;
- if (dev->power.direct_complete) {
- if (pm_runtime_status_suspended(dev)) {
- pm_runtime_disable(dev);
- if (pm_runtime_status_suspended(dev)) {
- pm_dev_dbg(dev, state, "direct-complete ");
- goto Complete;
- }
- pm_runtime_enable(dev);
- }
- dev->power.direct_complete = false;
- }
- dev->power.may_skip_resume = true;
- dev->power.must_resume = !dev_pm_test_driver_flags(dev, DPM_FLAG_MAY_SKIP_RESUME);
- dpm_watchdog_set(&wd, dev);
- device_lock(dev);
- if (dev->pm_domain) {
- info = "power domain ";
- callback = pm_op(&dev->pm_domain->ops, state);
- goto Run;
- }
- if (dev->type && dev->type->pm) {
- info = "type ";
- callback = pm_op(dev->type->pm, state);
- goto Run;
- }
- if (dev->class && dev->class->pm) {
- info = "class ";
- callback = pm_op(dev->class->pm, state);
- goto Run;
- }
- if (dev->bus) {
- if (dev->bus->pm) {
- info = "bus ";
- callback = pm_op(dev->bus->pm, state);
- } else if (dev->bus->suspend) {
- pm_dev_dbg(dev, state, "legacy bus ");
- error = legacy_suspend(dev, state, dev->bus->suspend,
- "legacy bus ");
- goto End;
- }
- }
- Run:
- if (!callback && dev->driver && dev->driver->pm) {
- info = "driver ";
- callback = pm_op(dev->driver->pm, state);
- }
- error = dpm_run_callback(callback, dev, state, info);
- End:
- if (!error) {
- dev->power.is_suspended = true;
- if (device_may_wakeup(dev))
- dev->power.wakeup_path = true;
- dpm_propagate_wakeup_to_parent(dev);
- dpm_clear_superiors_direct_complete(dev);
- } else {
- log_suspend_abort_reason("Device %s failed to %s: error %d",
- dev_name(dev), pm_verb(state.event), error);
- }
- device_unlock(dev);
- dpm_watchdog_clear(&wd);
- Complete:
- if (error)
- async_error = error;
- complete_all(&dev->power.completion);
- TRACE_SUSPEND(error);
- return error;
- }
- static void async_suspend(void *data, async_cookie_t cookie)
- {
- struct device *dev = (struct device *)data;
- int error;
- error = __device_suspend(dev, pm_transition, true);
- if (error) {
- dpm_save_failed_dev(dev_name(dev));
- pm_dev_err(dev, pm_transition, " async", error);
- }
- put_device(dev);
- }
- static int device_suspend(struct device *dev)
- {
- if (dpm_async_fn(dev, async_suspend))
- return 0;
- return __device_suspend(dev, pm_transition, false);
- }
- /**
- * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices.
- * @state: PM transition of the system being carried out.
- */
- int dpm_suspend(pm_message_t state)
- {
- ktime_t starttime = ktime_get();
- int error = 0;
- trace_suspend_resume(TPS("dpm_suspend"), state.event, true);
- might_sleep();
- devfreq_suspend();
- cpufreq_suspend();
- mutex_lock(&dpm_list_mtx);
- pm_transition = state;
- async_error = 0;
- while (!list_empty(&dpm_prepared_list)) {
- struct device *dev = to_device(dpm_prepared_list.prev);
- get_device(dev);
- mutex_unlock(&dpm_list_mtx);
- error = device_suspend(dev);
- mutex_lock(&dpm_list_mtx);
- if (error) {
- pm_dev_err(dev, state, "", error);
- dpm_save_failed_dev(dev_name(dev));
- } else if (!list_empty(&dev->power.entry)) {
- list_move(&dev->power.entry, &dpm_suspended_list);
- }
- mutex_unlock(&dpm_list_mtx);
- put_device(dev);
- mutex_lock(&dpm_list_mtx);
- if (error || async_error)
- break;
- }
- mutex_unlock(&dpm_list_mtx);
- async_synchronize_full();
- if (!error)
- error = async_error;
- if (error) {
- suspend_stats.failed_suspend++;
- dpm_save_failed_step(SUSPEND_SUSPEND);
- }
- dpm_show_time(starttime, state, error, NULL);
- trace_suspend_resume(TPS("dpm_suspend"), state.event, false);
- return error;
- }
- /**
- * device_prepare - Prepare a device for system power transition.
- * @dev: Device to handle.
- * @state: PM transition of the system being carried out.
- *
- * Execute the ->prepare() callback(s) for given device. No new children of the
- * device may be registered after this function has returned.
- */
- static int device_prepare(struct device *dev, pm_message_t state)
- {
- int (*callback)(struct device *) = NULL;
- int ret = 0;
- /*
- * If a device's parent goes into runtime suspend at the wrong time,
- * it won't be possible to resume the device. To prevent this we
- * block runtime suspend here, during the prepare phase, and allow
- * it again during the complete phase.
- */
- pm_runtime_get_noresume(dev);
- if (dev->power.syscore)
- return 0;
- device_lock(dev);
- dev->power.wakeup_path = false;
- if (dev->power.no_pm_callbacks)
- goto unlock;
- if (dev->pm_domain)
- callback = dev->pm_domain->ops.prepare;
- else if (dev->type && dev->type->pm)
- callback = dev->type->pm->prepare;
- else if (dev->class && dev->class->pm)
- callback = dev->class->pm->prepare;
- else if (dev->bus && dev->bus->pm)
- callback = dev->bus->pm->prepare;
- if (!callback && dev->driver && dev->driver->pm)
- callback = dev->driver->pm->prepare;
- if (callback)
- ret = callback(dev);
- unlock:
- device_unlock(dev);
- if (ret < 0) {
- suspend_report_result(dev, callback, ret);
- pm_runtime_put(dev);
- return ret;
- }
- /*
- * A positive return value from ->prepare() means "this device appears
- * to be runtime-suspended and its state is fine, so if it really is
- * runtime-suspended, you can leave it in that state provided that you
- * will do the same thing with all of its descendants". This only
- * applies to suspend transitions, however.
- */
- spin_lock_irq(&dev->power.lock);
- dev->power.direct_complete = state.event == PM_EVENT_SUSPEND &&
- (ret > 0 || dev->power.no_pm_callbacks) &&
- !dev_pm_test_driver_flags(dev, DPM_FLAG_NO_DIRECT_COMPLETE);
- spin_unlock_irq(&dev->power.lock);
- return 0;
- }
- /**
- * dpm_prepare - Prepare all non-sysdev devices for a system PM transition.
- * @state: PM transition of the system being carried out.
- *
- * Execute the ->prepare() callback(s) for all devices.
- */
- int dpm_prepare(pm_message_t state)
- {
- int error = 0;
- trace_suspend_resume(TPS("dpm_prepare"), state.event, true);
- might_sleep();
- /*
- * Give a chance for the known devices to complete their probes, before
- * disable probing of devices. This sync point is important at least
- * at boot time + hibernation restore.
- */
- wait_for_device_probe();
- /*
- * It is unsafe if probing of devices will happen during suspend or
- * hibernation and system behavior will be unpredictable in this case.
- * So, let's prohibit device's probing here and defer their probes
- * instead. The normal behavior will be restored in dpm_complete().
- */
- device_block_probing();
- mutex_lock(&dpm_list_mtx);
- while (!list_empty(&dpm_list) && !error) {
- struct device *dev = to_device(dpm_list.next);
- get_device(dev);
- mutex_unlock(&dpm_list_mtx);
- trace_device_pm_callback_start(dev, "", state.event);
- error = device_prepare(dev, state);
- trace_device_pm_callback_end(dev, error);
- mutex_lock(&dpm_list_mtx);
- if (!error) {
- dev->power.is_prepared = true;
- if (!list_empty(&dev->power.entry))
- list_move_tail(&dev->power.entry, &dpm_prepared_list);
- } else if (error == -EAGAIN) {
- error = 0;
- } else {
- dev_info(dev, "not prepared for power transition: code %d\n",
- error);
- log_suspend_abort_reason("Device %s not prepared for power transition: code %d",
- dev_name(dev), error);
- dpm_save_failed_dev(dev_name(dev));
- }
- mutex_unlock(&dpm_list_mtx);
- put_device(dev);
- mutex_lock(&dpm_list_mtx);
- }
- mutex_unlock(&dpm_list_mtx);
- trace_suspend_resume(TPS("dpm_prepare"), state.event, false);
- return error;
- }
- /**
- * dpm_suspend_start - Prepare devices for PM transition and suspend them.
- * @state: PM transition of the system being carried out.
- *
- * Prepare all non-sysdev devices for system PM transition and execute "suspend"
- * callbacks for them.
- */
- int dpm_suspend_start(pm_message_t state)
- {
- ktime_t starttime = ktime_get();
- int error;
- error = dpm_prepare(state);
- if (error) {
- suspend_stats.failed_prepare++;
- dpm_save_failed_step(SUSPEND_PREPARE);
- } else
- error = dpm_suspend(state);
- dpm_show_time(starttime, state, error, "start");
- return error;
- }
- EXPORT_SYMBOL_GPL(dpm_suspend_start);
- void __suspend_report_result(const char *function, struct device *dev, void *fn, int ret)
- {
- if (ret)
- dev_err(dev, "%s(): %pS returns %d\n", function, fn, ret);
- }
- EXPORT_SYMBOL_GPL(__suspend_report_result);
- /**
- * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete.
- * @subordinate: Device that needs to wait for @dev.
- * @dev: Device to wait for.
- */
- int device_pm_wait_for_dev(struct device *subordinate, struct device *dev)
- {
- dpm_wait(dev, subordinate->power.async_suspend);
- return async_error;
- }
- EXPORT_SYMBOL_GPL(device_pm_wait_for_dev);
- /**
- * dpm_for_each_dev - device iterator.
- * @data: data for the callback.
- * @fn: function to be called for each device.
- *
- * Iterate over devices in dpm_list, and call @fn for each device,
- * passing it @data.
- */
- void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *))
- {
- struct device *dev;
- if (!fn)
- return;
- device_pm_lock();
- list_for_each_entry(dev, &dpm_list, power.entry)
- fn(dev, data);
- device_pm_unlock();
- }
- EXPORT_SYMBOL_GPL(dpm_for_each_dev);
- static bool pm_ops_is_empty(const struct dev_pm_ops *ops)
- {
- if (!ops)
- return true;
- return !ops->prepare &&
- !ops->suspend &&
- !ops->suspend_late &&
- !ops->suspend_noirq &&
- !ops->resume_noirq &&
- !ops->resume_early &&
- !ops->resume &&
- !ops->complete;
- }
- void device_pm_check_callbacks(struct device *dev)
- {
- unsigned long flags;
- spin_lock_irqsave(&dev->power.lock, flags);
- dev->power.no_pm_callbacks =
- (!dev->bus || (pm_ops_is_empty(dev->bus->pm) &&
- !dev->bus->suspend && !dev->bus->resume)) &&
- (!dev->class || pm_ops_is_empty(dev->class->pm)) &&
- (!dev->type || pm_ops_is_empty(dev->type->pm)) &&
- (!dev->pm_domain || pm_ops_is_empty(&dev->pm_domain->ops)) &&
- (!dev->driver || (pm_ops_is_empty(dev->driver->pm) &&
- !dev->driver->suspend && !dev->driver->resume));
- spin_unlock_irqrestore(&dev->power.lock, flags);
- }
- bool dev_pm_skip_suspend(struct device *dev)
- {
- return dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) &&
- pm_runtime_status_suspended(dev);
- }
|