/* * drivers/base/power/domain.c - Common code related to device power domains. * * Copyright (C) 2011 Rafael J. Wysocki , Renesas Electronics Corp. * * This file is released under the GPLv2. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #define GENPD_RETRY_MAX_MS 250 /* Approximate */ #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ ({ \ type (*__routine)(struct device *__d); \ type __ret = (type)0; \ \ __routine = genpd->dev_ops.callback; \ if (__routine) { \ __ret = __routine(dev); \ } \ __ret; \ }) static LIST_HEAD(gpd_list); static DEFINE_MUTEX(gpd_list_lock); /* * Get the generic PM domain for a particular struct device. * This validates the struct device pointer, the PM domain pointer, * and checks that the PM domain pointer is a real generic PM domain. * Any failure results in NULL being returned. */ struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev) { struct generic_pm_domain *genpd = NULL, *gpd; if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain)) return NULL; mutex_lock(&gpd_list_lock); list_for_each_entry(gpd, &gpd_list, gpd_list_node) { if (&gpd->domain == dev->pm_domain) { genpd = gpd; break; } } mutex_unlock(&gpd_list_lock); return genpd; } /* * This should only be used where we are certain that the pm_domain * attached to the device is a genpd domain. */ static struct generic_pm_domain *dev_to_genpd(struct device *dev) { if (IS_ERR_OR_NULL(dev->pm_domain)) return ERR_PTR(-EINVAL); return pd_to_genpd(dev->pm_domain); } static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev) { return GENPD_DEV_CALLBACK(genpd, int, stop, dev); } static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev) { return GENPD_DEV_CALLBACK(genpd, int, start, dev); } static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) { bool ret = false; if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) ret = !!atomic_dec_and_test(&genpd->sd_count); return ret; } static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) { atomic_inc(&genpd->sd_count); smp_mb__after_atomic(); } static int genpd_power_on(struct generic_pm_domain *genpd, bool timed) { ktime_t time_start; s64 elapsed_ns; int ret; if (!genpd->power_on) return 0; if (!timed) return genpd->power_on(genpd); time_start = ktime_get(); ret = genpd->power_on(genpd); if (ret) return ret; elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); if (elapsed_ns <= genpd->power_on_latency_ns) return ret; genpd->power_on_latency_ns = elapsed_ns; genpd->max_off_time_changed = true; pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", genpd->name, "on", elapsed_ns); return ret; } static int genpd_power_off(struct generic_pm_domain *genpd, bool timed) { ktime_t time_start; s64 elapsed_ns; int ret; if (!genpd->power_off) return 0; if (!timed) return genpd->power_off(genpd); time_start = ktime_get(); ret = genpd->power_off(genpd); if (ret == -EBUSY) return ret; elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); if (elapsed_ns <= genpd->power_off_latency_ns) return ret; genpd->power_off_latency_ns = elapsed_ns; genpd->max_off_time_changed = true; pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", genpd->name, "off", elapsed_ns); return ret; } /** * genpd_queue_power_off_work - Queue up the execution of genpd_poweroff(). * @genpd: PM domait to power off. * * Queue up the execution of genpd_poweroff() unless it's already been done * before. */ static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) { queue_work(pm_wq, &genpd->power_off_work); } static int genpd_poweron(struct generic_pm_domain *genpd); /** * __genpd_poweron - Restore power to a given PM domain and its masters. * @genpd: PM domain to power up. * * Restore power to @genpd and all of its masters so that it is possible to * resume a device belonging to it. */ static int __genpd_poweron(struct generic_pm_domain *genpd) { struct gpd_link *link; int ret = 0; if (genpd->status == GPD_STATE_ACTIVE || (genpd->prepared_count > 0 && genpd->suspend_power_off)) return 0; /* * The list is guaranteed not to change while the loop below is being * executed, unless one of the masters' .power_on() callbacks fiddles * with it. */ list_for_each_entry(link, &genpd->slave_links, slave_node) { genpd_sd_counter_inc(link->master); ret = genpd_poweron(link->master); if (ret) { genpd_sd_counter_dec(link->master); goto err; } } ret = genpd_power_on(genpd, true); if (ret) goto err; genpd->status = GPD_STATE_ACTIVE; return 0; err: list_for_each_entry_continue_reverse(link, &genpd->slave_links, slave_node) { genpd_sd_counter_dec(link->master); genpd_queue_power_off_work(link->master); } return ret; } /** * genpd_poweron - Restore power to a given PM domain and its masters. * @genpd: PM domain to power up. */ static int genpd_poweron(struct generic_pm_domain *genpd) { int ret; mutex_lock(&genpd->lock); ret = __genpd_poweron(genpd); mutex_unlock(&genpd->lock); return ret; } static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev) { return GENPD_DEV_CALLBACK(genpd, int, save_state, dev); } static int genpd_restore_dev(struct generic_pm_domain *genpd, struct device *dev) { return GENPD_DEV_CALLBACK(genpd, int, restore_state, dev); } static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, unsigned long val, void *ptr) { struct generic_pm_domain_data *gpd_data; struct device *dev; gpd_data = container_of(nb, struct generic_pm_domain_data, nb); dev = gpd_data->base.dev; for (;;) { struct generic_pm_domain *genpd; struct pm_domain_data *pdd; spin_lock_irq(&dev->power.lock); pdd = dev->power.subsys_data ? dev->power.subsys_data->domain_data : NULL; if (pdd && pdd->dev) { to_gpd_data(pdd)->td.constraint_changed = true; genpd = dev_to_genpd(dev); } else { genpd = ERR_PTR(-ENODATA); } spin_unlock_irq(&dev->power.lock); if (!IS_ERR(genpd)) { mutex_lock(&genpd->lock); genpd->max_off_time_changed = true; mutex_unlock(&genpd->lock); } dev = dev->parent; if (!dev || dev->power.ignore_children) break; } return NOTIFY_DONE; } /** * genpd_poweroff - Remove power from a given PM domain. * @genpd: PM domain to power down. * @is_async: PM domain is powered down from a scheduled work * * If all of the @genpd's devices have been suspended and all of its subdomains * have been powered down, remove power from @genpd. */ static int genpd_poweroff(struct generic_pm_domain *genpd, bool is_async) { struct pm_domain_data *pdd; struct gpd_link *link; unsigned int not_suspended = 0; /* * Do not try to power off the domain in the following situations: * (1) The domain is already in the "power off" state. * (2) System suspend is in progress. */ if (genpd->status == GPD_STATE_POWER_OFF || genpd->prepared_count > 0) return 0; if (atomic_read(&genpd->sd_count) > 0) return -EBUSY; list_for_each_entry(pdd, &genpd->dev_list, list_node) { enum pm_qos_flags_status stat; stat = dev_pm_qos_flags(pdd->dev, PM_QOS_FLAG_NO_POWER_OFF | PM_QOS_FLAG_REMOTE_WAKEUP); if (stat > PM_QOS_FLAGS_NONE) return -EBUSY; if (!pm_runtime_suspended(pdd->dev) || pdd->dev->power.irq_safe) not_suspended++; } if (not_suspended > 1 || (not_suspended == 1 && is_async)) return -EBUSY; if (genpd->gov && genpd->gov->power_down_ok) { if (!genpd->gov->power_down_ok(&genpd->domain)) return -EAGAIN; } if (genpd->power_off) { int ret; if (atomic_read(&genpd->sd_count) > 0) return -EBUSY; /* * If sd_count > 0 at this point, one of the subdomains hasn't * managed to call genpd_poweron() for the master yet after * incrementing it. In that case genpd_poweron() will wait * for us to drop the lock, so we can call .power_off() and let * the genpd_poweron() restore power for us (this shouldn't * happen very often). */ ret = genpd_power_off(genpd, true); if (ret) return ret; } genpd->status = GPD_STATE_POWER_OFF; list_for_each_entry(link, &genpd->slave_links, slave_node) { genpd_sd_counter_dec(link->master); genpd_queue_power_off_work(link->master); } return 0; } /** * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. * @work: Work structure used for scheduling the execution of this function. */ static void genpd_power_off_work_fn(struct work_struct *work) { struct generic_pm_domain *genpd; genpd = container_of(work, struct generic_pm_domain, power_off_work); mutex_lock(&genpd->lock); genpd_poweroff(genpd, true); mutex_unlock(&genpd->lock); } /** * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. * @dev: Device to suspend. * * Carry out a runtime suspend of a device under the assumption that its * pm_domain field points to the domain member of an object of type * struct generic_pm_domain representing a PM domain consisting of I/O devices. */ static int pm_genpd_runtime_suspend(struct device *dev) { struct generic_pm_domain *genpd; bool (*stop_ok)(struct device *__dev); struct gpd_timing_data *td = &dev_gpd_data(dev)->td; ktime_t time_start; s64 elapsed_ns; int ret; dev_dbg(dev, "%s()\n", __func__); genpd = dev_to_genpd(dev); if (IS_ERR(genpd)) return -EINVAL; stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL; if (stop_ok && !stop_ok(dev)) return -EBUSY; /* Measure suspend latency. */ time_start = ktime_get(); ret = genpd_save_dev(genpd, dev); if (ret) return ret; ret = genpd_stop_dev(genpd, dev); if (ret) { genpd_restore_dev(genpd, dev); return ret; } /* Update suspend latency value if the measured time exceeds it. */ elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); if (elapsed_ns > td->suspend_latency_ns) { td->suspend_latency_ns = elapsed_ns; dev_dbg(dev, "suspend latency exceeded, %lld ns\n", elapsed_ns); genpd->max_off_time_changed = true; td->constraint_changed = true; } /* * If power.irq_safe is set, this routine will be run with interrupts * off, so it can't use mutexes. */ if (dev->power.irq_safe) return 0; mutex_lock(&genpd->lock); genpd_poweroff(genpd, false); mutex_unlock(&genpd->lock); return 0; } /** * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. * @dev: Device to resume. * * Carry out a runtime resume of a device under the assumption that its * pm_domain field points to the domain member of an object of type * struct generic_pm_domain representing a PM domain consisting of I/O devices. */ static int pm_genpd_runtime_resume(struct device *dev) { struct generic_pm_domain *genpd; struct gpd_timing_data *td = &dev_gpd_data(dev)->td; ktime_t time_start; s64 elapsed_ns; int ret; bool timed = true; dev_dbg(dev, "%s()\n", __func__); genpd = dev_to_genpd(dev); if (IS_ERR(genpd)) return -EINVAL; /* If power.irq_safe, the PM domain is never powered off. */ if (dev->power.irq_safe) { timed = false; goto out; } mutex_lock(&genpd->lock); ret = __genpd_poweron(genpd); mutex_unlock(&genpd->lock); if (ret) return ret; out: /* Measure resume latency. */ if (timed) time_start = ktime_get(); genpd_start_dev(genpd, dev); genpd_restore_dev(genpd, dev); /* Update resume latency value if the measured time exceeds it. */ if (timed) { elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); if (elapsed_ns > td->resume_latency_ns) { td->resume_latency_ns = elapsed_ns; dev_dbg(dev, "resume latency exceeded, %lld ns\n", elapsed_ns); genpd->max_off_time_changed = true; td->constraint_changed = true; } } return 0; } static bool pd_ignore_unused; static int __init pd_ignore_unused_setup(char *__unused) { pd_ignore_unused = true; return 1; } __setup("pd_ignore_unused", pd_ignore_unused_setup); /** * genpd_poweroff_unused - Power off all PM domains with no devices in use. */ static int __init genpd_poweroff_unused(void) { struct generic_pm_domain *genpd; if (pd_ignore_unused) { pr_warn("genpd: Not disabling unused power domains\n"); return 0; } mutex_lock(&gpd_list_lock); list_for_each_entry(genpd, &gpd_list, gpd_list_node) genpd_queue_power_off_work(genpd); mutex_unlock(&gpd_list_lock); return 0; } late_initcall(genpd_poweroff_unused); #ifdef CONFIG_PM_SLEEP /** * pm_genpd_present - Check if the given PM domain has been initialized. * @genpd: PM domain to check. */ static bool pm_genpd_present(const struct generic_pm_domain *genpd) { const struct generic_pm_domain *gpd; if (IS_ERR_OR_NULL(genpd)) return false; list_for_each_entry(gpd, &gpd_list, gpd_list_node) if (gpd == genpd) return true; return false; } static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, struct device *dev) { return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); } /** * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. * @genpd: PM domain to power off, if possible. * @timed: True if latency measurements are allowed. * * Check if the given PM domain can be powered off (during system suspend or * hibernation) and do that if so. Also, in that case propagate to its masters. * * This function is only called in "noirq" and "syscore" stages of system power * transitions, so it need not acquire locks (all of the "noirq" callbacks are * executed sequentially, so it is guaranteed that it will never run twice in * parallel). */ static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd, bool timed) { struct gpd_link *link; if (genpd->status == GPD_STATE_POWER_OFF) return; if (genpd->suspended_count != genpd->device_count || atomic_read(&genpd->sd_count) > 0) return; genpd_power_off(genpd, timed); genpd->status = GPD_STATE_POWER_OFF; list_for_each_entry(link, &genpd->slave_links, slave_node) { genpd_sd_counter_dec(link->master); pm_genpd_sync_poweroff(link->master, timed); } } /** * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters. * @genpd: PM domain to power on. * @timed: True if latency measurements are allowed. * * This function is only called in "noirq" and "syscore" stages of system power * transitions, so it need not acquire locks (all of the "noirq" callbacks are * executed sequentially, so it is guaranteed that it will never run twice in * parallel). */ static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd, bool timed) { struct gpd_link *link; if (genpd->status == GPD_STATE_ACTIVE) return; list_for_each_entry(link, &genpd->slave_links, slave_node) { pm_genpd_sync_poweron(link->master, timed); genpd_sd_counter_inc(link->master); } genpd_power_on(genpd, timed); genpd->status = GPD_STATE_ACTIVE; } /** * resume_needed - Check whether to resume a device before system suspend. * @dev: Device to check. * @genpd: PM domain the device belongs to. * * There are two cases in which a device that can wake up the system from sleep * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled * to wake up the system and it has to remain active for this purpose while the * system is in the sleep state and (2) if the device is not enabled to wake up * the system from sleep states and it generally doesn't generate wakeup signals * by itself (those signals are generated on its behalf by other parts of the * system). In the latter case it may be necessary to reconfigure the device's * wakeup settings during system suspend, because it may have been set up to * signal remote wakeup from the system's working state as needed by runtime PM. * Return 'true' in either of the above cases. */ static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) { bool active_wakeup; if (!device_can_wakeup(dev)) return false; active_wakeup = genpd_dev_active_wakeup(genpd, dev); return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; } /** * pm_genpd_prepare - Start power transition of a device in a PM domain. * @dev: Device to start the transition of. * * Start a power transition of a device (during a system-wide power transition) * under the assumption that its pm_domain field points to the domain member of * an object of type struct generic_pm_domain representing a PM domain * consisting of I/O devices. */ static int pm_genpd_prepare(struct device *dev) { struct generic_pm_domain *genpd; int ret; dev_dbg(dev, "%s()\n", __func__); genpd = dev_to_genpd(dev); if (IS_ERR(genpd)) return -EINVAL; /* * If a wakeup request is pending for the device, it should be woken up * at this point and a system wakeup event should be reported if it's * set up to wake up the system from sleep states. */ pm_runtime_get_noresume(dev); if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) pm_wakeup_event(dev, 0); if (pm_wakeup_pending()) { pm_runtime_put(dev); return -EBUSY; } if (resume_needed(dev, genpd)) pm_runtime_resume(dev); mutex_lock(&genpd->lock); if (genpd->prepared_count++ == 0) { genpd->suspended_count = 0; genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; } mutex_unlock(&genpd->lock); if (genpd->suspend_power_off) { pm_runtime_put_noidle(dev); return 0; } /* * The PM domain must be in the GPD_STATE_ACTIVE state at this point, * so genpd_poweron() will return immediately, but if the device * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need * to make it operational. */ pm_runtime_resume(dev); __pm_runtime_disable(dev, false); ret = pm_generic_prepare(dev); if (ret) { mutex_lock(&genpd->lock); if (--genpd->prepared_count == 0) genpd->suspend_power_off = false; mutex_unlock(&genpd->lock); pm_runtime_enable(dev); } pm_runtime_put(dev); return ret; } /** * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. * @dev: Device to suspend. * * Suspend a device under the assumption that its pm_domain field points to the * domain member of an object of type struct generic_pm_domain representing * a PM domain consisting of I/O devices. */ static int pm_genpd_suspend(struct device *dev) { struct generic_pm_domain *genpd; dev_dbg(dev, "%s()\n", __func__); genpd = dev_to_genpd(dev); if (IS_ERR(genpd)) return -EINVAL; return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev); } /** * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain. * @dev: Device to suspend. * * Carry out a late suspend of a device under the assumption that its * pm_domain field points to the domain member of an object of type * struct generic_pm_domain representing a PM domain consisting of I/O devices. */ static int pm_genpd_suspend_late(struct device *dev) { struct generic_pm_domain *genpd; dev_dbg(dev, "%s()\n", __func__); genpd = dev_to_genpd(dev); if (IS_ERR(genpd)) return -EINVAL; return genpd->suspend_power_off ? 0 : pm_generic_suspend_late(dev); } /** * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. * @dev: Device to suspend. * * Stop the device and remove power from the domain if all devices in it have * been stopped. */ static int pm_genpd_suspend_noirq(struct device *dev) { struct generic_pm_domain *genpd; dev_dbg(dev, "%s()\n", __func__); genpd = dev_to_genpd(dev); if (IS_ERR(genpd)) return -EINVAL; if (genpd->suspend_power_off || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) return 0; genpd_stop_dev(genpd, dev); /* * Since all of the "noirq" callbacks are executed sequentially, it is * guaranteed that this function will never run twice in parallel for * the same PM domain, so it is not necessary to use locking here. */ genpd->suspended_count++; pm_genpd_sync_poweroff(genpd, true); return 0; } /** * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. * @dev: Device to resume. * * Restore power to the device's PM domain, if necessary, and start the device. */ static int pm_genpd_resume_noirq(struct device *dev) { struct generic_pm_domain *genpd; dev_dbg(dev, "%s()\n", __func__); genpd = dev_to_genpd(dev); if (IS_ERR(genpd)) return -EINVAL; if (genpd->suspend_power_off || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) return 0; /* * Since all of the "noirq" callbacks are executed sequentially, it is * guaranteed that this function will never run twice in parallel for * the same PM domain, so it is not necessary to use locking here. */ pm_genpd_sync_poweron(genpd, true); genpd->suspended_count--; return genpd_start_dev(genpd, dev); } /** * pm_genpd_resume_early - Early resume of a device in an I/O PM domain. * @dev: Device to resume. * * Carry out an early resume of a device under the assumption that its * pm_domain field points to the domain member of an object of type * struct generic_pm_domain representing a power domain consisting of I/O * devices. */ static int pm_genpd_resume_early(struct device *dev) { struct generic_pm_domain *genpd; dev_dbg(dev, "%s()\n", __func__); genpd = dev_to_genpd(dev); if (IS_ERR(genpd)) return -EINVAL; return genpd->suspend_power_off ? 0 : pm_generic_resume_early(dev); } /** * pm_genpd_resume - Resume of device in an I/O PM domain. * @dev: Device to resume. * * Resume a device under the assumption that its pm_domain field points to the * domain member of an object of type struct generic_pm_domain representing * a power domain consisting of I/O devices. */ static int pm_genpd_resume(struct device *dev) { struct generic_pm_domain *genpd; dev_dbg(dev, "%s()\n", __func__); genpd = dev_to_genpd(dev); if (IS_ERR(genpd)) return -EINVAL; return genpd->suspend_power_off ? 0 : pm_generic_resume(dev); } /** * pm_genpd_freeze - Freezing a device in an I/O PM domain. * @dev: Device to freeze. * * Freeze a device under the assumption that its pm_domain field points to the * domain member of an object of type struct generic_pm_domain representing * a power domain consisting of I/O devices. */ static int pm_genpd_freeze(struct device *dev) { struct generic_pm_domain *genpd; dev_dbg(dev, "%s()\n", __func__); genpd = dev_to_genpd(dev); if (IS_ERR(genpd)) return -EINVAL; return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev); } /** * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain. * @dev: Device to freeze. * * Carry out a late freeze of a device under the assumption that its * pm_domain field points to the domain member of an object of type * struct generic_pm_domain representing a power domain consisting of I/O * devices. */ static int pm_genpd_freeze_late(struct device *dev) { struct generic_pm_domain *genpd; dev_dbg(dev, "%s()\n", __func__); genpd = dev_to_genpd(dev); if (IS_ERR(genpd)) return -EINVAL; return genpd->suspend_power_off ? 0 : pm_generic_freeze_late(dev); } /** * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. * @dev: Device to freeze. * * Carry out a late freeze of a device under the assumption that its * pm_domain field points to the domain member of an object of type * struct generic_pm_domain representing a power domain consisting of I/O * devices. */ static int pm_genpd_freeze_noirq(struct device *dev) { struct generic_pm_domain *genpd; dev_dbg(dev, "%s()\n", __func__); genpd = dev_to_genpd(dev); if (IS_ERR(genpd)) return -EINVAL; return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev); } /** * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. * @dev: Device to thaw. * * Start the device, unless power has been removed from the domain already * before the system transition. */ static int pm_genpd_thaw_noirq(struct device *dev) { struct generic_pm_domain *genpd; dev_dbg(dev, "%s()\n", __func__); genpd = dev_to_genpd(dev); if (IS_ERR(genpd)) return -EINVAL; return genpd->suspend_power_off ? 0 : genpd_start_dev(genpd, dev); } /** * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain. * @dev: Device to thaw. * * Carry out an early thaw of a device under the assumption that its * pm_domain field points to the domain member of an object of type * struct generic_pm_domain representing a power domain consisting of I/O * devices. */ static int pm_genpd_thaw_early(struct device *dev) { struct generic_pm_domain *genpd; dev_dbg(dev, "%s()\n", __func__); genpd = dev_to_genpd(dev); if (IS_ERR(genpd)) return -EINVAL; return genpd->suspend_power_off ? 0 : pm_generic_thaw_early(dev); } /** * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. * @dev: Device to thaw. * * Thaw a device under the assumption that its pm_domain field points to the * domain member of an object of type struct generic_pm_domain representing * a power domain consisting of I/O devices. */ static int pm_genpd_thaw(struct device *dev) { struct generic_pm_domain *genpd; dev_dbg(dev, "%s()\n", __func__); genpd = dev_to_genpd(dev); if (IS_ERR(genpd)) return -EINVAL; return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev); } /** * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. * @dev: Device to resume. * * Make sure the domain will be in the same power state as before the * hibernation the system is resuming from and start the device if necessary. */ static int pm_genpd_restore_noirq(struct device *dev) { struct generic_pm_domain *genpd; dev_dbg(dev, "%s()\n", __func__); genpd = dev_to_genpd(dev); if (IS_ERR(genpd)) return -EINVAL; /* * Since all of the "noirq" callbacks are executed sequentially, it is * guaranteed that this function will never run twice in parallel for * the same PM domain, so it is not necessary to use locking here. * * At this point suspended_count == 0 means we are being run for the * first time for the given domain in the present cycle. */ if (genpd->suspended_count++ == 0) { /* * The boot kernel might put the domain into arbitrary state, * so make it appear as powered off to pm_genpd_sync_poweron(), * so that it tries to power it on in case it was really off. */ genpd->status = GPD_STATE_POWER_OFF; if (genpd->suspend_power_off) { /* * If the domain was off before the hibernation, make * sure it will be off going forward. */ genpd_power_off(genpd, true); return 0; } } if (genpd->suspend_power_off) return 0; pm_genpd_sync_poweron(genpd, true); return genpd_start_dev(genpd, dev); } /** * pm_genpd_complete - Complete power transition of a device in a power domain. * @dev: Device to complete the transition of. * * Complete a power transition of a device (during a system-wide power * transition) under the assumption that its pm_domain field points to the * domain member of an object of type struct generic_pm_domain representing * a power domain consisting of I/O devices. */ static void pm_genpd_complete(struct device *dev) { struct generic_pm_domain *genpd; bool run_complete; dev_dbg(dev, "%s()\n", __func__); genpd = dev_to_genpd(dev); if (IS_ERR(genpd)) return; mutex_lock(&genpd->lock); run_complete = !genpd->suspend_power_off; if (--genpd->prepared_count == 0) genpd->suspend_power_off = false; mutex_unlock(&genpd->lock); if (run_complete) { pm_generic_complete(dev); pm_runtime_set_active(dev); pm_runtime_enable(dev); pm_request_idle(dev); } } /** * genpd_syscore_switch - Switch power during system core suspend or resume. * @dev: Device that normally is marked as "always on" to switch power for. * * This routine may only be called during the system core (syscore) suspend or * resume phase for devices whose "always on" flags are set. */ static void genpd_syscore_switch(struct device *dev, bool suspend) { struct generic_pm_domain *genpd; genpd = dev_to_genpd(dev); if (!pm_genpd_present(genpd)) return; if (suspend) { genpd->suspended_count++; pm_genpd_sync_poweroff(genpd, false); } else { pm_genpd_sync_poweron(genpd, false); genpd->suspended_count--; } } void pm_genpd_syscore_poweroff(struct device *dev) { genpd_syscore_switch(dev, true); } EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); void pm_genpd_syscore_poweron(struct device *dev) { genpd_syscore_switch(dev, false); } EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); #else /* !CONFIG_PM_SLEEP */ #define pm_genpd_prepare NULL #define pm_genpd_suspend NULL #define pm_genpd_suspend_late NULL #define pm_genpd_suspend_noirq NULL #define pm_genpd_resume_early NULL #define pm_genpd_resume_noirq NULL #define pm_genpd_resume NULL #define pm_genpd_freeze NULL #define pm_genpd_freeze_late NULL #define pm_genpd_freeze_noirq NULL #define pm_genpd_thaw_early NULL #define pm_genpd_thaw_noirq NULL #define pm_genpd_thaw NULL #define pm_genpd_restore_noirq NULL #define pm_genpd_complete NULL #endif /* CONFIG_PM_SLEEP */ static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, struct generic_pm_domain *genpd, struct gpd_timing_data *td) { struct generic_pm_domain_data *gpd_data; int ret; ret = dev_pm_get_subsys_data(dev); if (ret) return ERR_PTR(ret); gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); if (!gpd_data) { ret = -ENOMEM; goto err_put; } if (td) gpd_data->td = *td; gpd_data->base.dev = dev; gpd_data->td.constraint_changed = true; gpd_data->td.effective_constraint_ns = -1; gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; spin_lock_irq(&dev->power.lock); if (dev->power.subsys_data->domain_data) { ret = -EINVAL; goto err_free; } dev->power.subsys_data->domain_data = &gpd_data->base; dev->pm_domain = &genpd->domain; spin_unlock_irq(&dev->power.lock); return gpd_data; err_free: spin_unlock_irq(&dev->power.lock); kfree(gpd_data); err_put: dev_pm_put_subsys_data(dev); return ERR_PTR(ret); } static void genpd_free_dev_data(struct device *dev, struct generic_pm_domain_data *gpd_data) { spin_lock_irq(&dev->power.lock); dev->pm_domain = NULL; dev->power.subsys_data->domain_data = NULL; spin_unlock_irq(&dev->power.lock); kfree(gpd_data); dev_pm_put_subsys_data(dev); } /** * __pm_genpd_add_device - Add a device to an I/O PM domain. * @genpd: PM domain to add the device to. * @dev: Device to be added. * @td: Set of PM QoS timing parameters to attach to the device. */ int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, struct gpd_timing_data *td) { struct generic_pm_domain_data *gpd_data; int ret = 0; dev_dbg(dev, "%s()\n", __func__); if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) return -EINVAL; gpd_data = genpd_alloc_dev_data(dev, genpd, td); if (IS_ERR(gpd_data)) return PTR_ERR(gpd_data); mutex_lock(&genpd->lock); if (genpd->prepared_count > 0) { ret = -EAGAIN; goto out; } ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; if (ret) goto out; genpd->device_count++; genpd->max_off_time_changed = true; list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); out: mutex_unlock(&genpd->lock); if (ret) genpd_free_dev_data(dev, gpd_data); else dev_pm_qos_add_notifier(dev, &gpd_data->nb); return ret; } /** * pm_genpd_remove_device - Remove a device from an I/O PM domain. * @genpd: PM domain to remove the device from. * @dev: Device to be removed. */ int pm_genpd_remove_device(struct generic_pm_domain *genpd, struct device *dev) { struct generic_pm_domain_data *gpd_data; struct pm_domain_data *pdd; int ret = 0; dev_dbg(dev, "%s()\n", __func__); if (!genpd || genpd != pm_genpd_lookup_dev(dev)) return -EINVAL; /* The above validation also means we have existing domain_data. */ pdd = dev->power.subsys_data->domain_data; gpd_data = to_gpd_data(pdd); dev_pm_qos_remove_notifier(dev, &gpd_data->nb); mutex_lock(&genpd->lock); if (genpd->prepared_count > 0) { ret = -EAGAIN; goto out; } genpd->device_count--; genpd->max_off_time_changed = true; if (genpd->detach_dev) genpd->detach_dev(genpd, dev); list_del_init(&pdd->list_node); mutex_unlock(&genpd->lock); genpd_free_dev_data(dev, gpd_data); return 0; out: mutex_unlock(&genpd->lock); dev_pm_qos_add_notifier(dev, &gpd_data->nb); return ret; } /** * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. * @genpd: Master PM domain to add the subdomain to. * @subdomain: Subdomain to be added. */ int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, struct generic_pm_domain *subdomain) { struct gpd_link *link; int ret = 0; if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) || genpd == subdomain) return -EINVAL; mutex_lock(&genpd->lock); mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); if (genpd->status == GPD_STATE_POWER_OFF && subdomain->status != GPD_STATE_POWER_OFF) { ret = -EINVAL; goto out; } list_for_each_entry(link, &genpd->master_links, master_node) { if (link->slave == subdomain && link->master == genpd) { ret = -EINVAL; goto out; } } link = kzalloc(sizeof(*link), GFP_KERNEL); if (!link) { ret = -ENOMEM; goto out; } link->master = genpd; list_add_tail(&link->master_node, &genpd->master_links); link->slave = subdomain; list_add_tail(&link->slave_node, &subdomain->slave_links); if (subdomain->status != GPD_STATE_POWER_OFF) genpd_sd_counter_inc(genpd); out: mutex_unlock(&subdomain->lock); mutex_unlock(&genpd->lock); return ret; } /** * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. * @genpd: Master PM domain to remove the subdomain from. * @subdomain: Subdomain to be removed. */ int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, struct generic_pm_domain *subdomain) { struct gpd_link *link; int ret = -EINVAL; if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) return -EINVAL; mutex_lock(&genpd->lock); if (!list_empty(&subdomain->slave_links) || subdomain->device_count) { pr_warn("%s: unable to remove subdomain %s\n", genpd->name, subdomain->name); ret = -EBUSY; goto out; } list_for_each_entry(link, &genpd->master_links, master_node) { if (link->slave != subdomain) continue; mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); list_del(&link->master_node); list_del(&link->slave_node); kfree(link); if (subdomain->status != GPD_STATE_POWER_OFF) genpd_sd_counter_dec(genpd); mutex_unlock(&subdomain->lock); ret = 0; break; } out: mutex_unlock(&genpd->lock); return ret; } /* Default device callbacks for generic PM domains. */ /** * pm_genpd_default_save_state - Default "save device state" for PM domains. * @dev: Device to handle. */ static int pm_genpd_default_save_state(struct device *dev) { int (*cb)(struct device *__dev); if (dev->type && dev->type->pm) cb = dev->type->pm->runtime_suspend; else if (dev->class && dev->class->pm) cb = dev->class->pm->runtime_suspend; else if (dev->bus && dev->bus->pm) cb = dev->bus->pm->runtime_suspend; else cb = NULL; if (!cb && dev->driver && dev->driver->pm) cb = dev->driver->pm->runtime_suspend; return cb ? cb(dev) : 0; } /** * pm_genpd_default_restore_state - Default PM domains "restore device state". * @dev: Device to handle. */ static int pm_genpd_default_restore_state(struct device *dev) { int (*cb)(struct device *__dev); if (dev->type && dev->type->pm) cb = dev->type->pm->runtime_resume; else if (dev->class && dev->class->pm) cb = dev->class->pm->runtime_resume; else if (dev->bus && dev->bus->pm) cb = dev->bus->pm->runtime_resume; else cb = NULL; if (!cb && dev->driver && dev->driver->pm) cb = dev->driver->pm->runtime_resume; return cb ? cb(dev) : 0; } /** * pm_genpd_init - Initialize a generic I/O PM domain object. * @genpd: PM domain object to initialize. * @gov: PM domain governor to associate with the domain (may be NULL). * @is_off: Initial value of the domain's power_is_off field. */ void pm_genpd_init(struct generic_pm_domain *genpd, struct dev_power_governor *gov, bool is_off) { if (IS_ERR_OR_NULL(genpd)) return; INIT_LIST_HEAD(&genpd->master_links); INIT_LIST_HEAD(&genpd->slave_links); INIT_LIST_HEAD(&genpd->dev_list); mutex_init(&genpd->lock); genpd->gov = gov; INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); atomic_set(&genpd->sd_count, 0); genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; genpd->device_count = 0; genpd->max_off_time_ns = -1; genpd->max_off_time_changed = true; genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; genpd->domain.ops.prepare = pm_genpd_prepare; genpd->domain.ops.suspend = pm_genpd_suspend; genpd->domain.ops.suspend_late = pm_genpd_suspend_late; genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; genpd->domain.ops.resume_early = pm_genpd_resume_early; genpd->domain.ops.resume = pm_genpd_resume; genpd->domain.ops.freeze = pm_genpd_freeze; genpd->domain.ops.freeze_late = pm_genpd_freeze_late; genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; genpd->domain.ops.thaw_early = pm_genpd_thaw_early; genpd->domain.ops.thaw = pm_genpd_thaw; genpd->domain.ops.poweroff = pm_genpd_suspend; genpd->domain.ops.poweroff_late = pm_genpd_suspend_late; genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; genpd->domain.ops.restore_early = pm_genpd_resume_early; genpd->domain.ops.restore = pm_genpd_resume; genpd->domain.ops.complete = pm_genpd_complete; genpd->dev_ops.save_state = pm_genpd_default_save_state; genpd->dev_ops.restore_state = pm_genpd_default_restore_state; if (genpd->flags & GENPD_FLAG_PM_CLK) { genpd->dev_ops.stop = pm_clk_suspend; genpd->dev_ops.start = pm_clk_resume; } mutex_lock(&gpd_list_lock); list_add(&genpd->gpd_list_node, &gpd_list); mutex_unlock(&gpd_list_lock); } EXPORT_SYMBOL_GPL(pm_genpd_init); #ifdef CONFIG_PM_GENERIC_DOMAINS_OF /* * Device Tree based PM domain providers. * * The code below implements generic device tree based PM domain providers that * bind device tree nodes with generic PM domains registered in the system. * * Any driver that registers generic PM domains and needs to support binding of * devices to these domains is supposed to register a PM domain provider, which * maps a PM domain specifier retrieved from the device tree to a PM domain. * * Two simple mapping functions have been provided for convenience: * - __of_genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. * - __of_genpd_xlate_onecell() for mapping of multiple PM domains per node by * index. */ /** * struct of_genpd_provider - PM domain provider registration structure * @link: Entry in global list of PM domain providers * @node: Pointer to device tree node of PM domain provider * @xlate: Provider-specific xlate callback mapping a set of specifier cells * into a PM domain. * @data: context pointer to be passed into @xlate callback */ struct of_genpd_provider { struct list_head link; struct device_node *node; genpd_xlate_t xlate; void *data; }; /* List of registered PM domain providers. */ static LIST_HEAD(of_genpd_providers); /* Mutex to protect the list above. */ static DEFINE_MUTEX(of_genpd_mutex); /** * __of_genpd_xlate_simple() - Xlate function for direct node-domain mapping * @genpdspec: OF phandle args to map into a PM domain * @data: xlate function private data - pointer to struct generic_pm_domain * * This is a generic xlate function that can be used to model PM domains that * have their own device tree nodes. The private data of xlate function needs * to be a valid pointer to struct generic_pm_domain. */ struct generic_pm_domain *__of_genpd_xlate_simple( struct of_phandle_args *genpdspec, void *data) { if (genpdspec->args_count != 0) return ERR_PTR(-EINVAL); return data; } EXPORT_SYMBOL_GPL(__of_genpd_xlate_simple); /** * __of_genpd_xlate_onecell() - Xlate function using a single index. * @genpdspec: OF phandle args to map into a PM domain * @data: xlate function private data - pointer to struct genpd_onecell_data * * This is a generic xlate function that can be used to model simple PM domain * controllers that have one device tree node and provide multiple PM domains. * A single cell is used as an index into an array of PM domains specified in * the genpd_onecell_data struct when registering the provider. */ struct generic_pm_domain *__of_genpd_xlate_onecell( struct of_phandle_args *genpdspec, void *data) { struct genpd_onecell_data *genpd_data = data; unsigned int idx = genpdspec->args[0]; if (genpdspec->args_count != 1) return ERR_PTR(-EINVAL); if (idx >= genpd_data->num_domains) { pr_err("%s: invalid domain index %u\n", __func__, idx); return ERR_PTR(-EINVAL); } if (!genpd_data->domains[idx]) return ERR_PTR(-ENOENT); return genpd_data->domains[idx]; } EXPORT_SYMBOL_GPL(__of_genpd_xlate_onecell); /** * __of_genpd_add_provider() - Register a PM domain provider for a node * @np: Device node pointer associated with the PM domain provider. * @xlate: Callback for decoding PM domain from phandle arguments. * @data: Context pointer for @xlate callback. */ int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, void *data) { struct of_genpd_provider *cp; cp = kzalloc(sizeof(*cp), GFP_KERNEL); if (!cp) return -ENOMEM; cp->node = of_node_get(np); cp->data = data; cp->xlate = xlate; mutex_lock(&of_genpd_mutex); list_add(&cp->link, &of_genpd_providers); mutex_unlock(&of_genpd_mutex); pr_debug("Added domain provider from %s\n", np->full_name); return 0; } EXPORT_SYMBOL_GPL(__of_genpd_add_provider); /** * of_genpd_del_provider() - Remove a previously registered PM domain provider * @np: Device node pointer associated with the PM domain provider */ void of_genpd_del_provider(struct device_node *np) { struct of_genpd_provider *cp; mutex_lock(&of_genpd_mutex); list_for_each_entry(cp, &of_genpd_providers, link) { if (cp->node == np) { list_del(&cp->link); of_node_put(cp->node); kfree(cp); break; } } mutex_unlock(&of_genpd_mutex); } EXPORT_SYMBOL_GPL(of_genpd_del_provider); /** * of_genpd_get_from_provider() - Look-up PM domain * @genpdspec: OF phandle args to use for look-up * * Looks for a PM domain provider under the node specified by @genpdspec and if * found, uses xlate function of the provider to map phandle args to a PM * domain. * * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() * on failure. */ struct generic_pm_domain *of_genpd_get_from_provider( struct of_phandle_args *genpdspec) { struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); struct of_genpd_provider *provider; mutex_lock(&of_genpd_mutex); /* Check if we have such a provider in our array */ list_for_each_entry(provider, &of_genpd_providers, link) { if (provider->node == genpdspec->np) genpd = provider->xlate(genpdspec, provider->data); if (!IS_ERR(genpd)) break; } mutex_unlock(&of_genpd_mutex); return genpd; } EXPORT_SYMBOL_GPL(of_genpd_get_from_provider); /** * genpd_dev_pm_detach - Detach a device from its PM domain. * @dev: Device to detach. * @power_off: Currently not used * * Try to locate a corresponding generic PM domain, which the device was * attached to previously. If such is found, the device is detached from it. */ static void genpd_dev_pm_detach(struct device *dev, bool power_off) { struct generic_pm_domain *pd; unsigned int i; int ret = 0; pd = pm_genpd_lookup_dev(dev); if (!pd) return; dev_dbg(dev, "removing from PM domain %s\n", pd->name); for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { ret = pm_genpd_remove_device(pd, dev); if (ret != -EAGAIN) break; mdelay(i); cond_resched(); } if (ret < 0) { dev_err(dev, "failed to remove from PM domain %s: %d", pd->name, ret); return; } /* Check if PM domain can be powered off after removing this device. */ genpd_queue_power_off_work(pd); } static void genpd_dev_pm_sync(struct device *dev) { struct generic_pm_domain *pd; pd = dev_to_genpd(dev); if (IS_ERR(pd)) return; genpd_queue_power_off_work(pd); } /** * genpd_dev_pm_attach - Attach a device to its PM domain using DT. * @dev: Device to attach. * * Parse device's OF node to find a PM domain specifier. If such is found, * attaches the device to retrieved pm_domain ops. * * Both generic and legacy Samsung-specific DT bindings are supported to keep * backwards compatibility with existing DTBs. * * Returns 0 on successfully attached PM domain or negative error code. Note * that if a power-domain exists for the device, but it cannot be found or * turned on, then return -EPROBE_DEFER to ensure that the device is not * probed and to re-try again later. */ int genpd_dev_pm_attach(struct device *dev) { struct of_phandle_args pd_args; struct generic_pm_domain *pd; unsigned int i; int ret; if (!dev->of_node) return -ENODEV; if (dev->pm_domain) return -EEXIST; ret = of_parse_phandle_with_args(dev->of_node, "power-domains", "#power-domain-cells", 0, &pd_args); if (ret < 0) { if (ret != -ENOENT) return ret; /* * Try legacy Samsung-specific bindings * (for backwards compatibility of DT ABI) */ pd_args.args_count = 0; pd_args.np = of_parse_phandle(dev->of_node, "samsung,power-domain", 0); if (!pd_args.np) return -ENOENT; } pd = of_genpd_get_from_provider(&pd_args); if (IS_ERR(pd)) { dev_dbg(dev, "%s() failed to find PM domain: %ld\n", __func__, PTR_ERR(pd)); of_node_put(dev->of_node); return -EPROBE_DEFER; } dev_dbg(dev, "adding to PM domain %s\n", pd->name); for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { ret = pm_genpd_add_device(pd, dev); if (ret != -EAGAIN) break; mdelay(i); cond_resched(); } if (ret < 0) { dev_err(dev, "failed to add to PM domain %s: %d", pd->name, ret); of_node_put(dev->of_node); goto out; } dev->pm_domain->detach = genpd_dev_pm_detach; dev->pm_domain->sync = genpd_dev_pm_sync; ret = genpd_poweron(pd); out: return ret ? -EPROBE_DEFER : 0; } EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ /*** debugfs support ***/ #ifdef CONFIG_PM_ADVANCED_DEBUG #include #include #include #include #include #include static struct dentry *pm_genpd_debugfs_dir; /* * TODO: This function is a slightly modified version of rtpm_status_show * from sysfs.c, so generalize it. */ static void rtpm_status_str(struct seq_file *s, struct device *dev) { static const char * const status_lookup[] = { [RPM_ACTIVE] = "active", [RPM_RESUMING] = "resuming", [RPM_SUSPENDED] = "suspended", [RPM_SUSPENDING] = "suspending" }; const char *p = ""; if (dev->power.runtime_error) p = "error"; else if (dev->power.disable_depth) p = "unsupported"; else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) p = status_lookup[dev->power.runtime_status]; else WARN_ON(1); seq_puts(s, p); } static int pm_genpd_summary_one(struct seq_file *s, struct generic_pm_domain *genpd) { static const char * const status_lookup[] = { [GPD_STATE_ACTIVE] = "on", [GPD_STATE_POWER_OFF] = "off" }; struct pm_domain_data *pm_data; const char *kobj_path; struct gpd_link *link; int ret; ret = mutex_lock_interruptible(&genpd->lock); if (ret) return -ERESTARTSYS; if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) goto exit; seq_printf(s, "%-30s %-15s ", genpd->name, status_lookup[genpd->status]); /* * Modifications on the list require holding locks on both * master and slave, so we are safe. * Also genpd->name is immutable. */ list_for_each_entry(link, &genpd->master_links, master_node) { seq_printf(s, "%s", link->slave->name); if (!list_is_last(&link->master_node, &genpd->master_links)) seq_puts(s, ", "); } list_for_each_entry(pm_data, &genpd->dev_list, list_node) { kobj_path = kobject_get_path(&pm_data->dev->kobj, GFP_KERNEL); if (kobj_path == NULL) continue; seq_printf(s, "\n %-50s ", kobj_path); rtpm_status_str(s, pm_data->dev); kfree(kobj_path); } seq_puts(s, "\n"); exit: mutex_unlock(&genpd->lock); return 0; } static int pm_genpd_summary_show(struct seq_file *s, void *data) { struct generic_pm_domain *genpd; int ret = 0; seq_puts(s, "domain status slaves\n"); seq_puts(s, " /device runtime status\n"); seq_puts(s, "----------------------------------------------------------------------\n"); ret = mutex_lock_interruptible(&gpd_list_lock); if (ret) return -ERESTARTSYS; list_for_each_entry(genpd, &gpd_list, gpd_list_node) { ret = pm_genpd_summary_one(s, genpd); if (ret) break; } mutex_unlock(&gpd_list_lock); return ret; } static int pm_genpd_summary_open(struct inode *inode, struct file *file) { return single_open(file, pm_genpd_summary_show, NULL); } static const struct file_operations pm_genpd_summary_fops = { .open = pm_genpd_summary_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static int __init pm_genpd_debug_init(void) { struct dentry *d; pm_genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); if (!pm_genpd_debugfs_dir) return -ENOMEM; d = debugfs_create_file("pm_genpd_summary", S_IRUGO, pm_genpd_debugfs_dir, NULL, &pm_genpd_summary_fops); if (!d) return -ENOMEM; return 0; } late_initcall(pm_genpd_debug_init); static void __exit pm_genpd_debug_exit(void) { debugfs_remove_recursive(pm_genpd_debugfs_dir); } __exitcall(pm_genpd_debug_exit); #endif /* CONFIG_PM_ADVANCED_DEBUG */