| /* |
| * drivers/base/power/domain.c - Common code related to device power domains. |
| * |
| * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. |
| * |
| * This file is released under the GPLv2. |
| */ |
| |
| #define pr_fmt(fmt) "PM: " fmt |
| |
| #include <linux/delay.h> |
| #include <linux/kernel.h> |
| #include <linux/io.h> |
| #include <linux/platform_device.h> |
| #include <linux/pm_opp.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/pm_domain.h> |
| #include <linux/pm_qos.h> |
| #include <linux/pm_clock.h> |
| #include <linux/slab.h> |
| #include <linux/err.h> |
| #include <linux/sched.h> |
| #include <linux/suspend.h> |
| #include <linux/export.h> |
| |
| #include "power.h" |
| |
| #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); |
| |
| struct genpd_lock_ops { |
| void (*lock)(struct generic_pm_domain *genpd); |
| void (*lock_nested)(struct generic_pm_domain *genpd, int depth); |
| int (*lock_interruptible)(struct generic_pm_domain *genpd); |
| void (*unlock)(struct generic_pm_domain *genpd); |
| }; |
| |
| static void genpd_lock_mtx(struct generic_pm_domain *genpd) |
| { |
| mutex_lock(&genpd->mlock); |
| } |
| |
| static void genpd_lock_nested_mtx(struct generic_pm_domain *genpd, |
| int depth) |
| { |
| mutex_lock_nested(&genpd->mlock, depth); |
| } |
| |
| static int genpd_lock_interruptible_mtx(struct generic_pm_domain *genpd) |
| { |
| return mutex_lock_interruptible(&genpd->mlock); |
| } |
| |
| static void genpd_unlock_mtx(struct generic_pm_domain *genpd) |
| { |
| return mutex_unlock(&genpd->mlock); |
| } |
| |
| static const struct genpd_lock_ops genpd_mtx_ops = { |
| .lock = genpd_lock_mtx, |
| .lock_nested = genpd_lock_nested_mtx, |
| .lock_interruptible = genpd_lock_interruptible_mtx, |
| .unlock = genpd_unlock_mtx, |
| }; |
| |
| static void genpd_lock_spin(struct generic_pm_domain *genpd) |
| __acquires(&genpd->slock) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&genpd->slock, flags); |
| genpd->lock_flags = flags; |
| } |
| |
| static void genpd_lock_nested_spin(struct generic_pm_domain *genpd, |
| int depth) |
| __acquires(&genpd->slock) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave_nested(&genpd->slock, flags, depth); |
| genpd->lock_flags = flags; |
| } |
| |
| static int genpd_lock_interruptible_spin(struct generic_pm_domain *genpd) |
| __acquires(&genpd->slock) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&genpd->slock, flags); |
| genpd->lock_flags = flags; |
| return 0; |
| } |
| |
| static void genpd_unlock_spin(struct generic_pm_domain *genpd) |
| __releases(&genpd->slock) |
| { |
| spin_unlock_irqrestore(&genpd->slock, genpd->lock_flags); |
| } |
| |
| static const struct genpd_lock_ops genpd_spin_ops = { |
| .lock = genpd_lock_spin, |
| .lock_nested = genpd_lock_nested_spin, |
| .lock_interruptible = genpd_lock_interruptible_spin, |
| .unlock = genpd_unlock_spin, |
| }; |
| |
| #define genpd_lock(p) p->lock_ops->lock(p) |
| #define genpd_lock_nested(p, d) p->lock_ops->lock_nested(p, d) |
| #define genpd_lock_interruptible(p) p->lock_ops->lock_interruptible(p) |
| #define genpd_unlock(p) p->lock_ops->unlock(p) |
| |
| #define genpd_status_on(genpd) (genpd->status == GPD_STATE_ACTIVE) |
| #define genpd_is_irq_safe(genpd) (genpd->flags & GENPD_FLAG_IRQ_SAFE) |
| #define genpd_is_always_on(genpd) (genpd->flags & GENPD_FLAG_ALWAYS_ON) |
| #define genpd_is_active_wakeup(genpd) (genpd->flags & GENPD_FLAG_ACTIVE_WAKEUP) |
| |
| static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev, |
| const struct generic_pm_domain *genpd) |
| { |
| bool ret; |
| |
| ret = pm_runtime_is_irq_safe(dev) && !genpd_is_irq_safe(genpd); |
| |
| /* |
| * Warn once if an IRQ safe device is attached to a no sleep domain, as |
| * to indicate a suboptimal configuration for PM. For an always on |
| * domain this isn't case, thus don't warn. |
| */ |
| if (ret && !genpd_is_always_on(genpd)) |
| dev_warn_once(dev, "PM domain %s will not be powered off\n", |
| genpd->name); |
| |
| return ret; |
| } |
| |
| /* |
| * 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. |
| */ |
| static struct generic_pm_domain *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(const struct generic_pm_domain *genpd, |
| struct device *dev) |
| { |
| return GENPD_DEV_CALLBACK(genpd, int, stop, dev); |
| } |
| |
| static int genpd_start_dev(const 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(); |
| } |
| |
| #ifdef CONFIG_DEBUG_FS |
| static void genpd_update_accounting(struct generic_pm_domain *genpd) |
| { |
| ktime_t delta, now; |
| |
| now = ktime_get(); |
| delta = ktime_sub(now, genpd->accounting_time); |
| |
| /* |
| * If genpd->status is active, it means we are just |
| * out of off and so update the idle time and vice |
| * versa. |
| */ |
| if (genpd->status == GPD_STATE_ACTIVE) { |
| int state_idx = genpd->state_idx; |
| |
| genpd->states[state_idx].idle_time = |
| ktime_add(genpd->states[state_idx].idle_time, delta); |
| } else { |
| genpd->on_time = ktime_add(genpd->on_time, delta); |
| } |
| |
| genpd->accounting_time = now; |
| } |
| #else |
| static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {} |
| #endif |
| |
| static int _genpd_reeval_performance_state(struct generic_pm_domain *genpd, |
| unsigned int state) |
| { |
| struct generic_pm_domain_data *pd_data; |
| struct pm_domain_data *pdd; |
| struct gpd_link *link; |
| |
| /* New requested state is same as Max requested state */ |
| if (state == genpd->performance_state) |
| return state; |
| |
| /* New requested state is higher than Max requested state */ |
| if (state > genpd->performance_state) |
| return state; |
| |
| /* Traverse all devices within the domain */ |
| list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
| pd_data = to_gpd_data(pdd); |
| |
| if (pd_data->performance_state > state) |
| state = pd_data->performance_state; |
| } |
| |
| /* |
| * Traverse all sub-domains within the domain. This can be |
| * done without any additional locking as the link->performance_state |
| * field is protected by the master genpd->lock, which is already taken. |
| * |
| * Also note that link->performance_state (subdomain's performance state |
| * requirement to master domain) is different from |
| * link->slave->performance_state (current performance state requirement |
| * of the devices/sub-domains of the subdomain) and so can have a |
| * different value. |
| * |
| * Note that we also take vote from powered-off sub-domains into account |
| * as the same is done for devices right now. |
| */ |
| list_for_each_entry(link, &genpd->master_links, master_node) { |
| if (link->performance_state > state) |
| state = link->performance_state; |
| } |
| |
| return state; |
| } |
| |
| static int _genpd_set_performance_state(struct generic_pm_domain *genpd, |
| unsigned int state, int depth) |
| { |
| struct generic_pm_domain *master; |
| struct gpd_link *link; |
| int master_state, ret; |
| |
| if (state == genpd->performance_state) |
| return 0; |
| |
| /* Propagate to masters of genpd */ |
| list_for_each_entry(link, &genpd->slave_links, slave_node) { |
| master = link->master; |
| |
| if (!master->set_performance_state) |
| continue; |
| |
| /* Find master's performance state */ |
| ret = dev_pm_opp_xlate_performance_state(genpd->opp_table, |
| master->opp_table, |
| state); |
| if (unlikely(ret < 0)) |
| goto err; |
| |
| master_state = ret; |
| |
| genpd_lock_nested(master, depth + 1); |
| |
| link->prev_performance_state = link->performance_state; |
| link->performance_state = master_state; |
| master_state = _genpd_reeval_performance_state(master, |
| master_state); |
| ret = _genpd_set_performance_state(master, master_state, depth + 1); |
| if (ret) |
| link->performance_state = link->prev_performance_state; |
| |
| genpd_unlock(master); |
| |
| if (ret) |
| goto err; |
| } |
| |
| ret = genpd->set_performance_state(genpd, state); |
| if (ret) |
| goto err; |
| |
| genpd->performance_state = state; |
| return 0; |
| |
| err: |
| /* Encountered an error, lets rollback */ |
| list_for_each_entry_continue_reverse(link, &genpd->slave_links, |
| slave_node) { |
| master = link->master; |
| |
| if (!master->set_performance_state) |
| continue; |
| |
| genpd_lock_nested(master, depth + 1); |
| |
| master_state = link->prev_performance_state; |
| link->performance_state = master_state; |
| |
| master_state = _genpd_reeval_performance_state(master, |
| master_state); |
| if (_genpd_set_performance_state(master, master_state, depth + 1)) { |
| pr_err("%s: Failed to roll back to %d performance state\n", |
| master->name, master_state); |
| } |
| |
| genpd_unlock(master); |
| } |
| |
| return ret; |
| } |
| |
| /** |
| * dev_pm_genpd_set_performance_state- Set performance state of device's power |
| * domain. |
| * |
| * @dev: Device for which the performance-state needs to be set. |
| * @state: Target performance state of the device. This can be set as 0 when the |
| * device doesn't have any performance state constraints left (And so |
| * the device wouldn't participate anymore to find the target |
| * performance state of the genpd). |
| * |
| * It is assumed that the users guarantee that the genpd wouldn't be detached |
| * while this routine is getting called. |
| * |
| * Returns 0 on success and negative error values on failures. |
| */ |
| int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state) |
| { |
| struct generic_pm_domain *genpd; |
| struct generic_pm_domain_data *gpd_data; |
| unsigned int prev; |
| int ret; |
| |
| genpd = dev_to_genpd(dev); |
| if (IS_ERR(genpd)) |
| return -ENODEV; |
| |
| if (unlikely(!genpd->set_performance_state)) |
| return -EINVAL; |
| |
| if (unlikely(!dev->power.subsys_data || |
| !dev->power.subsys_data->domain_data)) { |
| WARN_ON(1); |
| return -EINVAL; |
| } |
| |
| genpd_lock(genpd); |
| |
| gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); |
| prev = gpd_data->performance_state; |
| gpd_data->performance_state = state; |
| |
| state = _genpd_reeval_performance_state(genpd, state); |
| ret = _genpd_set_performance_state(genpd, state, 0); |
| if (ret) |
| gpd_data->performance_state = prev; |
| |
| genpd_unlock(genpd); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state); |
| |
| static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed) |
| { |
| unsigned int state_idx = genpd->state_idx; |
| 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->states[state_idx].power_on_latency_ns) |
| return ret; |
| |
| genpd->states[state_idx].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) |
| { |
| unsigned int state_idx = genpd->state_idx; |
| 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) |
| return ret; |
| |
| elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
| if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns) |
| return 0; |
| |
| genpd->states[state_idx].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 0; |
| } |
| |
| /** |
| * genpd_queue_power_off_work - Queue up the execution of genpd_power_off(). |
| * @genpd: PM domain to power off. |
| * |
| * Queue up the execution of genpd_power_off() 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); |
| } |
| |
| /** |
| * genpd_power_off - Remove power from a given PM domain. |
| * @genpd: PM domain to power down. |
| * @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the |
| * RPM status of the releated device is in an intermediate state, not yet turned |
| * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not |
| * be RPM_SUSPENDED, while it tries to power off the PM domain. |
| * |
| * 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_power_off(struct generic_pm_domain *genpd, bool one_dev_on, |
| unsigned int depth) |
| { |
| 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_on(genpd) || genpd->prepared_count > 0) |
| return 0; |
| |
| /* |
| * Abort power off for the PM domain in the following situations: |
| * (1) The domain is configured as always on. |
| * (2) When the domain has a subdomain being powered on. |
| */ |
| if (genpd_is_always_on(genpd) || 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); |
| if (stat > PM_QOS_FLAGS_NONE) |
| return -EBUSY; |
| |
| /* |
| * Do not allow PM domain to be powered off, when an IRQ safe |
| * device is part of a non-IRQ safe domain. |
| */ |
| if (!pm_runtime_suspended(pdd->dev) || |
| irq_safe_dev_in_no_sleep_domain(pdd->dev, genpd)) |
| not_suspended++; |
| } |
| |
| if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on)) |
| return -EBUSY; |
| |
| if (genpd->gov && genpd->gov->power_down_ok) { |
| if (!genpd->gov->power_down_ok(&genpd->domain)) |
| return -EAGAIN; |
| } |
| |
| /* Default to shallowest state. */ |
| if (!genpd->gov) |
| genpd->state_idx = 0; |
| |
| 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_power_on() for the master yet after |
| * incrementing it. In that case genpd_power_on() will wait |
| * for us to drop the lock, so we can call .power_off() and let |
| * the genpd_power_on() 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; |
| genpd_update_accounting(genpd); |
| |
| list_for_each_entry(link, &genpd->slave_links, slave_node) { |
| genpd_sd_counter_dec(link->master); |
| genpd_lock_nested(link->master, depth + 1); |
| genpd_power_off(link->master, false, depth + 1); |
| genpd_unlock(link->master); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * genpd_power_on - Restore power to a given PM domain and its masters. |
| * @genpd: PM domain to power up. |
| * @depth: nesting count for lockdep. |
| * |
| * Restore power to @genpd and all of its masters so that it is possible to |
| * resume a device belonging to it. |
| */ |
| static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth) |
| { |
| struct gpd_link *link; |
| int ret = 0; |
| |
| if (genpd_status_on(genpd)) |
| 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) { |
| struct generic_pm_domain *master = link->master; |
| |
| genpd_sd_counter_inc(master); |
| |
| genpd_lock_nested(master, depth + 1); |
| ret = genpd_power_on(master, depth + 1); |
| genpd_unlock(master); |
| |
| if (ret) { |
| genpd_sd_counter_dec(master); |
| goto err; |
| } |
| } |
| |
| ret = _genpd_power_on(genpd, true); |
| if (ret) |
| goto err; |
| |
| genpd->status = GPD_STATE_ACTIVE; |
| genpd_update_accounting(genpd); |
| |
| return 0; |
| |
| err: |
| list_for_each_entry_continue_reverse(link, |
| &genpd->slave_links, |
| slave_node) { |
| genpd_sd_counter_dec(link->master); |
| genpd_lock_nested(link->master, depth + 1); |
| genpd_power_off(link->master, false, depth + 1); |
| genpd_unlock(link->master); |
| } |
| |
| return ret; |
| } |
| |
| 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) { |
| 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)) { |
| genpd_lock(genpd); |
| genpd->max_off_time_changed = true; |
| genpd_unlock(genpd); |
| } |
| |
| dev = dev->parent; |
| if (!dev || dev->power.ignore_children) |
| break; |
| } |
| |
| return NOTIFY_DONE; |
| } |
| |
| /** |
| * 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); |
| |
| genpd_lock(genpd); |
| genpd_power_off(genpd, false, 0); |
| genpd_unlock(genpd); |
| } |
| |
| /** |
| * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks |
| * @dev: Device to handle. |
| */ |
| static int __genpd_runtime_suspend(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; |
| } |
| |
| /** |
| * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks |
| * @dev: Device to handle. |
| */ |
| static int __genpd_runtime_resume(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; |
| } |
| |
| /** |
| * 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 genpd_runtime_suspend(struct device *dev) |
| { |
| struct generic_pm_domain *genpd; |
| bool (*suspend_ok)(struct device *__dev); |
| struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
| bool runtime_pm = pm_runtime_enabled(dev); |
| 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; |
| |
| /* |
| * A runtime PM centric subsystem/driver may re-use the runtime PM |
| * callbacks for other purposes than runtime PM. In those scenarios |
| * runtime PM is disabled. Under these circumstances, we shall skip |
| * validating/measuring the PM QoS latency. |
| */ |
| suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL; |
| if (runtime_pm && suspend_ok && !suspend_ok(dev)) |
| return -EBUSY; |
| |
| /* Measure suspend latency. */ |
| time_start = 0; |
| if (runtime_pm) |
| time_start = ktime_get(); |
| |
| ret = __genpd_runtime_suspend(dev); |
| if (ret) |
| return ret; |
| |
| ret = genpd_stop_dev(genpd, dev); |
| if (ret) { |
| __genpd_runtime_resume(dev); |
| return ret; |
| } |
| |
| /* Update suspend latency value if the measured time exceeds it. */ |
| if (runtime_pm) { |
| 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 may be run with |
| * IRQs disabled, so suspend only if the PM domain also is irq_safe. |
| */ |
| if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) |
| return 0; |
| |
| genpd_lock(genpd); |
| genpd_power_off(genpd, true, 0); |
| genpd_unlock(genpd); |
| |
| return 0; |
| } |
| |
| /** |
| * 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 genpd_runtime_resume(struct device *dev) |
| { |
| struct generic_pm_domain *genpd; |
| struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
| bool runtime_pm = pm_runtime_enabled(dev); |
| 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; |
| |
| /* |
| * As we don't power off a non IRQ safe domain, which holds |
| * an IRQ safe device, we don't need to restore power to it. |
| */ |
| if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) { |
| timed = false; |
| goto out; |
| } |
| |
| genpd_lock(genpd); |
| ret = genpd_power_on(genpd, 0); |
| genpd_unlock(genpd); |
| |
| if (ret) |
| return ret; |
| |
| out: |
| /* Measure resume latency. */ |
| time_start = 0; |
| if (timed && runtime_pm) |
| time_start = ktime_get(); |
| |
| ret = genpd_start_dev(genpd, dev); |
| if (ret) |
| goto err_poweroff; |
| |
| ret = __genpd_runtime_resume(dev); |
| if (ret) |
| goto err_stop; |
| |
| /* Update resume latency value if the measured time exceeds it. */ |
| if (timed && runtime_pm) { |
| 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; |
| |
| err_stop: |
| genpd_stop_dev(genpd, dev); |
| err_poweroff: |
| if (!pm_runtime_is_irq_safe(dev) || |
| (pm_runtime_is_irq_safe(dev) && genpd_is_irq_safe(genpd))) { |
| genpd_lock(genpd); |
| genpd_power_off(genpd, true, 0); |
| genpd_unlock(genpd); |
| } |
| |
| return ret; |
| } |
| |
| 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_power_off_unused - Power off all PM domains with no devices in use. |
| */ |
| static int __init genpd_power_off_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_power_off_unused); |
| |
| #if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM_GENERIC_DOMAINS_OF) |
| |
| static bool 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; |
| } |
| |
| #endif |
| |
| #ifdef CONFIG_PM_SLEEP |
| |
| /** |
| * genpd_sync_power_off - Synchronously power off a PM domain and its masters. |
| * @genpd: PM domain to power off, if possible. |
| * @use_lock: use the lock. |
| * @depth: nesting count for lockdep. |
| * |
| * 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. The "noirq" callbacks may be executed asynchronously, thus in |
| * these cases the lock must be held. |
| */ |
| static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock, |
| unsigned int depth) |
| { |
| struct gpd_link *link; |
| |
| if (!genpd_status_on(genpd) || genpd_is_always_on(genpd)) |
| return; |
| |
| if (genpd->suspended_count != genpd->device_count |
| || atomic_read(&genpd->sd_count) > 0) |
| return; |
| |
| /* Choose the deepest state when suspending */ |
| genpd->state_idx = genpd->state_count - 1; |
| if (_genpd_power_off(genpd, false)) |
| return; |
| |
| genpd->status = GPD_STATE_POWER_OFF; |
| |
| list_for_each_entry(link, &genpd->slave_links, slave_node) { |
| genpd_sd_counter_dec(link->master); |
| |
| if (use_lock) |
| genpd_lock_nested(link->master, depth + 1); |
| |
| genpd_sync_power_off(link->master, use_lock, depth + 1); |
| |
| if (use_lock) |
| genpd_unlock(link->master); |
| } |
| } |
| |
| /** |
| * genpd_sync_power_on - Synchronously power on a PM domain and its masters. |
| * @genpd: PM domain to power on. |
| * @use_lock: use the lock. |
| * @depth: nesting count for lockdep. |
| * |
| * This function is only called in "noirq" and "syscore" stages of system power |
| * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
| * these cases the lock must be held. |
| */ |
| static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock, |
| unsigned int depth) |
| { |
| struct gpd_link *link; |
| |
| if (genpd_status_on(genpd)) |
| return; |
| |
| list_for_each_entry(link, &genpd->slave_links, slave_node) { |
| genpd_sd_counter_inc(link->master); |
| |
| if (use_lock) |
| genpd_lock_nested(link->master, depth + 1); |
| |
| genpd_sync_power_on(link->master, use_lock, depth + 1); |
| |
| if (use_lock) |
| genpd_unlock(link->master); |
| } |
| |
| _genpd_power_on(genpd, false); |
| |
| 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 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, |
| const struct generic_pm_domain *genpd) |
| { |
| bool active_wakeup; |
| |
| if (!device_can_wakeup(dev)) |
| return false; |
| |
| active_wakeup = genpd_is_active_wakeup(genpd); |
| return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
| } |
| |
| /** |
| * 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 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. |
| */ |
| if (resume_needed(dev, genpd)) |
| pm_runtime_resume(dev); |
| |
| genpd_lock(genpd); |
| |
| if (genpd->prepared_count++ == 0) |
| genpd->suspended_count = 0; |
| |
| genpd_unlock(genpd); |
| |
| ret = pm_generic_prepare(dev); |
| if (ret < 0) { |
| genpd_lock(genpd); |
| |
| genpd->prepared_count--; |
| |
| genpd_unlock(genpd); |
| } |
| |
| /* Never return 1, as genpd don't cope with the direct_complete path. */ |
| return ret >= 0 ? 0 : ret; |
| } |
| |
| /** |
| * genpd_finish_suspend - Completion of suspend or hibernation of device in an |
| * I/O pm domain. |
| * @dev: Device to suspend. |
| * @poweroff: Specifies if this is a poweroff_noirq or suspend_noirq callback. |
| * |
| * Stop the device and remove power from the domain if all devices in it have |
| * been stopped. |
| */ |
| static int genpd_finish_suspend(struct device *dev, bool poweroff) |
| { |
| struct generic_pm_domain *genpd; |
| int ret = 0; |
| |
| genpd = dev_to_genpd(dev); |
| if (IS_ERR(genpd)) |
| return -EINVAL; |
| |
| if (poweroff) |
| ret = pm_generic_poweroff_noirq(dev); |
| else |
| ret = pm_generic_suspend_noirq(dev); |
| if (ret) |
| return ret; |
| |
| if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd)) |
| return 0; |
| |
| if (genpd->dev_ops.stop && genpd->dev_ops.start && |
| !pm_runtime_status_suspended(dev)) { |
| ret = genpd_stop_dev(genpd, dev); |
| if (ret) { |
| if (poweroff) |
| pm_generic_restore_noirq(dev); |
| else |
| pm_generic_resume_noirq(dev); |
| return ret; |
| } |
| } |
| |
| genpd_lock(genpd); |
| genpd->suspended_count++; |
| genpd_sync_power_off(genpd, true, 0); |
| genpd_unlock(genpd); |
| |
| return 0; |
| } |
| |
| /** |
| * 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 genpd_suspend_noirq(struct device *dev) |
| { |
| dev_dbg(dev, "%s()\n", __func__); |
| |
| return genpd_finish_suspend(dev, false); |
| } |
| |
| /** |
| * 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 genpd_resume_noirq(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 (dev->power.wakeup_path && genpd_is_active_wakeup(genpd)) |
| return pm_generic_resume_noirq(dev); |
| |
| genpd_lock(genpd); |
| genpd_sync_power_on(genpd, true, 0); |
| genpd->suspended_count--; |
| genpd_unlock(genpd); |
| |
| if (genpd->dev_ops.stop && genpd->dev_ops.start && |
| !pm_runtime_status_suspended(dev)) { |
| ret = genpd_start_dev(genpd, dev); |
| if (ret) |
| return ret; |
| } |
| |
| return pm_generic_resume_noirq(dev); |
| } |
| |
| /** |
| * 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 genpd_freeze_noirq(struct device *dev) |
| { |
| const struct generic_pm_domain *genpd; |
| int ret = 0; |
| |
| dev_dbg(dev, "%s()\n", __func__); |
| |
| genpd = dev_to_genpd(dev); |
| if (IS_ERR(genpd)) |
| return -EINVAL; |
| |
| ret = pm_generic_freeze_noirq(dev); |
| if (ret) |
| return ret; |
| |
| if (genpd->dev_ops.stop && genpd->dev_ops.start && |
| !pm_runtime_status_suspended(dev)) |
| ret = genpd_stop_dev(genpd, dev); |
| |
| return ret; |
| } |
| |
| /** |
| * 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 genpd_thaw_noirq(struct device *dev) |
| { |
| const struct generic_pm_domain *genpd; |
| int ret = 0; |
| |
| dev_dbg(dev, "%s()\n", __func__); |
| |
| genpd = dev_to_genpd(dev); |
| if (IS_ERR(genpd)) |
| return -EINVAL; |
| |
| if (genpd->dev_ops.stop && genpd->dev_ops.start && |
| !pm_runtime_status_suspended(dev)) { |
| ret = genpd_start_dev(genpd, dev); |
| if (ret) |
| return ret; |
| } |
| |
| return pm_generic_thaw_noirq(dev); |
| } |
| |
| /** |
| * genpd_poweroff_noirq - Completion of hibernation of device in an |
| * I/O PM domain. |
| * @dev: Device to poweroff. |
| * |
| * Stop the device and remove power from the domain if all devices in it have |
| * been stopped. |
| */ |
| static int genpd_poweroff_noirq(struct device *dev) |
| { |
| dev_dbg(dev, "%s()\n", __func__); |
| |
| return genpd_finish_suspend(dev, true); |
| } |
| |
| /** |
| * 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 genpd_restore_noirq(struct device *dev) |
| { |
| struct generic_pm_domain *genpd; |
| int ret = 0; |
| |
| dev_dbg(dev, "%s()\n", __func__); |
| |
| genpd = dev_to_genpd(dev); |
| if (IS_ERR(genpd)) |
| return -EINVAL; |
| |
| /* |
| * At this point suspended_count == 0 means we are being run for the |
| * first time for the given domain in the present cycle. |
| */ |
| genpd_lock(genpd); |
| if (genpd->suspended_count++ == 0) |
| /* |
| * The boot kernel might put the domain into arbitrary state, |
| * so make it appear as powered off to genpd_sync_power_on(), |
| * so that it tries to power it on in case it was really off. |
| */ |
| genpd->status = GPD_STATE_POWER_OFF; |
| |
| genpd_sync_power_on(genpd, true, 0); |
| genpd_unlock(genpd); |
| |
| if (genpd->dev_ops.stop && genpd->dev_ops.start && |
| !pm_runtime_status_suspended(dev)) { |
| ret = genpd_start_dev(genpd, dev); |
| if (ret) |
| return ret; |
| } |
| |
| return pm_generic_restore_noirq(dev); |
| } |
| |
| /** |
| * 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 genpd_complete(struct device *dev) |
| { |
| struct generic_pm_domain *genpd; |
| |
| dev_dbg(dev, "%s()\n", __func__); |
| |
| genpd = dev_to_genpd(dev); |
| if (IS_ERR(genpd)) |
| return; |
| |
| pm_generic_complete(dev); |
| |
| genpd_lock(genpd); |
| |
| genpd->prepared_count--; |
| if (!genpd->prepared_count) |
| genpd_queue_power_off_work(genpd); |
| |
| genpd_unlock(genpd); |
| } |
| |
| /** |
| * 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 (!genpd_present(genpd)) |
| return; |
| |
| if (suspend) { |
| genpd->suspended_count++; |
| genpd_sync_power_off(genpd, false, 0); |
| } else { |
| genpd_sync_power_on(genpd, false, 0); |
| 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 genpd_prepare NULL |
| #define genpd_suspend_noirq NULL |
| #define genpd_resume_noirq NULL |
| #define genpd_freeze_noirq NULL |
| #define genpd_thaw_noirq NULL |
| #define genpd_poweroff_noirq NULL |
| #define genpd_restore_noirq NULL |
| #define genpd_complete NULL |
| |
| #endif /* CONFIG_PM_SLEEP */ |
| |
| static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, |
| 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 = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; |
| 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; |
| |
| 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->power.subsys_data->domain_data = NULL; |
| |
| spin_unlock_irq(&dev->power.lock); |
| |
| kfree(gpd_data); |
| dev_pm_put_subsys_data(dev); |
| } |
| |
| static int 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; |
| |
| 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, td); |
| if (IS_ERR(gpd_data)) |
| return PTR_ERR(gpd_data); |
| |
| ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
| if (ret) |
| goto out; |
| |
| genpd_lock(genpd); |
| |
| dev_pm_domain_set(dev, &genpd->domain); |
| |
| genpd->device_count++; |
| genpd->max_off_time_changed = true; |
| |
| list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
| |
| genpd_unlock(genpd); |
| out: |
| if (ret) |
| genpd_free_dev_data(dev, gpd_data); |
| else |
| dev_pm_qos_add_notifier(dev, &gpd_data->nb); |
| |
| return ret; |
| } |
| |
| /** |
| * 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. |
| */ |
| int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev) |
| { |
| int ret; |
| |
| mutex_lock(&gpd_list_lock); |
| ret = genpd_add_device(genpd, dev, NULL); |
| mutex_unlock(&gpd_list_lock); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(pm_genpd_add_device); |
| |
| static int 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__); |
| |
| pdd = dev->power.subsys_data->domain_data; |
| gpd_data = to_gpd_data(pdd); |
| dev_pm_qos_remove_notifier(dev, &gpd_data->nb); |
| |
| genpd_lock(genpd); |
| |
| if (genpd->prepared_count > 0) { |
| ret = -EAGAIN; |
| goto out; |
| } |
| |
| genpd->device_count--; |
| genpd->max_off_time_changed = true; |
| |
| dev_pm_domain_set(dev, NULL); |
| |
| list_del_init(&pdd->list_node); |
| |
| genpd_unlock(genpd); |
| |
| if (genpd->detach_dev) |
| genpd->detach_dev(genpd, dev); |
| |
| genpd_free_dev_data(dev, gpd_data); |
| |
| return 0; |
| |
| out: |
| genpd_unlock(genpd); |
| dev_pm_qos_add_notifier(dev, &gpd_data->nb); |
| |
| return ret; |
| } |
| |
| /** |
| * pm_genpd_remove_device - Remove a device from an I/O PM domain. |
| * @dev: Device to be removed. |
| */ |
| int pm_genpd_remove_device(struct device *dev) |
| { |
| struct generic_pm_domain *genpd = genpd_lookup_dev(dev); |
| |
| if (!genpd) |
| return -EINVAL; |
| |
| return genpd_remove_device(genpd, dev); |
| } |
| EXPORT_SYMBOL_GPL(pm_genpd_remove_device); |
| |
| static int genpd_add_subdomain(struct generic_pm_domain *genpd, |
| struct generic_pm_domain *subdomain) |
| { |
| struct gpd_link *link, *itr; |
| int ret = 0; |
| |
| if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
| || genpd == subdomain) |
| return -EINVAL; |
| |
| /* |
| * If the domain can be powered on/off in an IRQ safe |
| * context, ensure that the subdomain can also be |
| * powered on/off in that context. |
| */ |
| if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) { |
| WARN(1, "Parent %s of subdomain %s must be IRQ safe\n", |
| genpd->name, subdomain->name); |
| return -EINVAL; |
| } |
| |
| link = kzalloc(sizeof(*link), GFP_KERNEL); |
| if (!link) |
| return -ENOMEM; |
| |
| genpd_lock(subdomain); |
| genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); |
| |
| if (!genpd_status_on(genpd) && genpd_status_on(subdomain)) { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| list_for_each_entry(itr, &genpd->master_links, master_node) { |
| if (itr->slave == subdomain && itr->master == genpd) { |
| ret = -EINVAL; |
| 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 (genpd_status_on(subdomain)) |
| genpd_sd_counter_inc(genpd); |
| |
| out: |
| genpd_unlock(genpd); |
| genpd_unlock(subdomain); |
| if (ret) |
| kfree(link); |
| 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) |
| { |
| int ret; |
| |
| mutex_lock(&gpd_list_lock); |
| ret = genpd_add_subdomain(genpd, subdomain); |
| mutex_unlock(&gpd_list_lock); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain); |
| |
| /** |
| * 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 *l, *link; |
| int ret = -EINVAL; |
| |
| if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
| return -EINVAL; |
| |
| genpd_lock(subdomain); |
| genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); |
| |
| if (!list_empty(&subdomain->master_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_safe(link, l, &genpd->master_links, master_node) { |
| if (link->slave != subdomain) |
| continue; |
| |
| list_del(&link->master_node); |
| list_del(&link->slave_node); |
| kfree(link); |
| if (genpd_status_on(subdomain)) |
| genpd_sd_counter_dec(genpd); |
| |
| ret = 0; |
| break; |
| } |
| |
| out: |
| genpd_unlock(genpd); |
| genpd_unlock(subdomain); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); |
| |
| static int genpd_set_default_power_state(struct generic_pm_domain *genpd) |
| { |
| struct genpd_power_state *state; |
| |
| state = kzalloc(sizeof(*state), GFP_KERNEL); |
| if (!state) |
| return -ENOMEM; |
| |
| genpd->states = state; |
| genpd->state_count = 1; |
| genpd->free = state; |
| |
| return 0; |
| } |
| |
| static void genpd_lock_init(struct generic_pm_domain *genpd) |
| { |
| if (genpd->flags & GENPD_FLAG_IRQ_SAFE) { |
| spin_lock_init(&genpd->slock); |
| genpd->lock_ops = &genpd_spin_ops; |
| } else { |
| mutex_init(&genpd->mlock); |
| genpd->lock_ops = &genpd_mtx_ops; |
| } |
| } |
| |
| /** |
| * 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. |
| * |
| * Returns 0 on successful initialization, else a negative error code. |
| */ |
| int pm_genpd_init(struct generic_pm_domain *genpd, |
| struct dev_power_governor *gov, bool is_off) |
| { |
| int ret; |
| |
| if (IS_ERR_OR_NULL(genpd)) |
| return -EINVAL; |
| |
| INIT_LIST_HEAD(&genpd->master_links); |
| INIT_LIST_HEAD(&genpd->slave_links); |
| INIT_LIST_HEAD(&genpd->dev_list); |
| genpd_lock_init(genpd); |
| 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->provider = NULL; |
| genpd->has_provider = false; |
| genpd->accounting_time = ktime_get(); |
| genpd->domain.ops.runtime_suspend = genpd_runtime_suspend; |
| genpd->domain.ops.runtime_resume = genpd_runtime_resume; |
| genpd->domain.ops.prepare = genpd_prepare; |
| genpd->domain.ops.suspend_noirq = genpd_suspend_noirq; |
| genpd->domain.ops.resume_noirq = genpd_resume_noirq; |
| genpd->domain.ops.freeze_noirq = genpd_freeze_noirq; |
| genpd->domain.ops.thaw_noirq = genpd_thaw_noirq; |
| genpd->domain.ops.poweroff_noirq = genpd_poweroff_noirq; |
| genpd->domain.ops.restore_noirq = genpd_restore_noirq; |
| genpd->domain.ops.complete = genpd_complete; |
| |
| if (genpd->flags & GENPD_FLAG_PM_CLK) { |
| genpd->dev_ops.stop = pm_clk_suspend; |
| genpd->dev_ops.start = pm_clk_resume; |
| } |
| |
| /* Always-on domains must be powered on at initialization. */ |
| if (genpd_is_always_on(genpd) && !genpd_status_on(genpd)) |
| return -EINVAL; |
| |
| /* Use only one "off" state if there were no states declared */ |
| if (genpd->state_count == 0) { |
| ret = genpd_set_default_power_state(genpd); |
| if (ret) |
| return ret; |
| } else if (!gov && genpd->state_count > 1) { |
| pr_warn("%s: no governor for states\n", genpd->name); |
| } |
| |
| device_initialize(&genpd->dev); |
| dev_set_name(&genpd->dev, "%s", genpd->name); |
| |
| mutex_lock(&gpd_list_lock); |
| list_add(&genpd->gpd_list_node, &gpd_list); |
| mutex_unlock(&gpd_list_lock); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(pm_genpd_init); |
| |
| static int genpd_remove(struct generic_pm_domain *genpd) |
| { |
| struct gpd_link *l, *link; |
| |
| if (IS_ERR_OR_NULL(genpd)) |
| return -EINVAL; |
| |
| genpd_lock(genpd); |
| |
| if (genpd->has_provider) { |
| genpd_unlock(genpd); |
| pr_err("Provider present, unable to remove %s\n", genpd->name); |
| return -EBUSY; |
| } |
| |
| if (!list_empty(&genpd->master_links) || genpd->device_count) { |
| genpd_unlock(genpd); |
| pr_err("%s: unable to remove %s\n", __func__, genpd->name); |
| return -EBUSY; |
| } |
| |
| list_for_each_entry_safe(link, l, &genpd->slave_links, slave_node) { |
| list_del(&link->master_node); |
| list_del(&link->slave_node); |
| kfree(link); |
| } |
| |
| list_del(&genpd->gpd_list_node); |
| genpd_unlock(genpd); |
| cancel_work_sync(&genpd->power_off_work); |
| kfree(genpd->free); |
| pr_debug("%s: removed %s\n", __func__, genpd->name); |
| |
| return 0; |
| } |
| |
| /** |
| * pm_genpd_remove - Remove a generic I/O PM domain |
| * @genpd: Pointer to PM domain that is to be removed. |
| * |
| * To remove the PM domain, this function: |
| * - Removes the PM domain as a subdomain to any parent domains, |
| * if it was added. |
| * - Removes the PM domain from the list of registered PM domains. |
| * |
| * The PM domain will only be removed, if the associated provider has |
| * been removed, it is not a parent to any other PM domain and has no |
| * devices associated with it. |
| */ |
| int pm_genpd_remove(struct generic_pm_domain *genpd) |
| { |
| int ret; |
| |
| mutex_lock(&gpd_list_lock); |
| ret = genpd_remove(genpd); |
| mutex_unlock(&gpd_list_lock); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(pm_genpd_remove); |
| |
| #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: |
| * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. |
| * - 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); |
| |
| /** |
| * 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. |
| */ |
| static struct generic_pm_domain *genpd_xlate_simple( |
| struct of_phandle_args *genpdspec, |
| void *data) |
| { |
| return data; |
| } |
| |
| /** |
| * 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. |
| */ |
| static struct generic_pm_domain *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]; |
| } |
| |
| /** |
| * 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. |
| */ |
| static int 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 %pOF\n", np); |
| |
| return 0; |
| } |
| |
| /** |
| * of_genpd_add_provider_simple() - Register a simple PM domain provider |
| * @np: Device node pointer associated with the PM domain provider. |
| * @genpd: Pointer to PM domain associated with the PM domain provider. |
| */ |
| int of_genpd_add_provider_simple(struct device_node *np, |
| struct generic_pm_domain *genpd) |
| { |
| int ret = -EINVAL; |
| |
| if (!np || !genpd) |
| return -EINVAL; |
| |
| mutex_lock(&gpd_list_lock); |
| |
| if (!genpd_present(genpd)) |
| goto unlock; |
| |
| genpd->dev.of_node = np; |
| |
| /* Parse genpd OPP table */ |
| if (genpd->set_performance_state) { |
| ret = dev_pm_opp_of_add_table(&genpd->dev); |
| if (ret) { |
| dev_err(&genpd->dev, "Failed to add OPP table: %d\n", |
| ret); |
| goto unlock; |
| } |
| |
| /* |
| * Save table for faster processing while setting performance |
| * state. |
| */ |
| genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev); |
| WARN_ON(!genpd->opp_table); |
| } |
| |
| ret = genpd_add_provider(np, genpd_xlate_simple, genpd); |
| if (ret) { |
| if (genpd->set_performance_state) { |
| dev_pm_opp_put_opp_table(genpd->opp_table); |
| dev_pm_opp_of_remove_table(&genpd->dev); |
| } |
| |
| goto unlock; |
| } |
| |
| genpd->provider = &np->fwnode; |
| genpd->has_provider = true; |
| |
| unlock: |
| mutex_unlock(&gpd_list_lock); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple); |
| |
| /** |
| * of_genpd_add_provider_onecell() - Register a onecell PM domain provider |
| * @np: Device node pointer associated with the PM domain provider. |
| * @data: Pointer to the data associated with the PM domain provider. |
| */ |
| int of_genpd_add_provider_onecell(struct device_node *np, |
| struct genpd_onecell_data *data) |
| { |
| struct generic_pm_domain *genpd; |
| unsigned int i; |
| int ret = -EINVAL; |
| |
| if (!np || !data) |
| return -EINVAL; |
| |
| mutex_lock(&gpd_list_lock); |
| |
| if (!data->xlate) |
| data->xlate = genpd_xlate_onecell; |
| |
| for (i = 0; i < data->num_domains; i++) { |
| genpd = data->domains[i]; |
| |
| if (!genpd) |
| continue; |
| if (!genpd_present(genpd)) |
| goto error; |
| |
| genpd->dev.of_node = np; |
| |
| /* Parse genpd OPP table */ |
| if (genpd->set_performance_state) { |
| ret = dev_pm_opp_of_add_table_indexed(&genpd->dev, i); |
| if (ret) { |
| dev_err(&genpd->dev, "Failed to add OPP table for index %d: %d\n", |
| i, ret); |
| goto error; |
| } |
| |
| /* |
| * Save table for faster processing while setting |
| * performance state. |
| */ |
| genpd->opp_table = dev_pm_opp_get_opp_table_indexed(&genpd->dev, i); |
| WARN_ON(!genpd->opp_table); |
| } |
| |
| genpd->provider = &np->fwnode; |
| genpd->has_provider = true; |
| } |
| |
| ret = genpd_add_provider(np, data->xlate, data); |
| if (ret < 0) |
| goto error; |
| |
| mutex_unlock(&gpd_list_lock); |
| |
| return 0; |
| |
| error: |
| while (i--) { |
| genpd = data->domains[i]; |
| |
| if (!genpd) |
| continue; |
| |
| genpd->provider = NULL; |
| genpd->has_provider = false; |
| |
| if (genpd->set_performance_state) { |
| dev_pm_opp_put_opp_table(genpd->opp_table); |
| dev_pm_opp_of_remove_table(&genpd->dev); |
| } |
| } |
| |
| mutex_unlock(&gpd_list_lock); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell); |
| |
| /** |
| * 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, *tmp; |
| struct generic_pm_domain *gpd; |
| |
| mutex_lock(&gpd_list_lock); |
| mutex_lock(&of_genpd_mutex); |
| list_for_each_entry_safe(cp, tmp, &of_genpd_providers, link) { |
| if (cp->node == np) { |
| /* |
| * For each PM domain associated with the |
| * provider, set the 'has_provider' to false |
| * so that the PM domain can be safely removed. |
| */ |
| list_for_each_entry(gpd, &gpd_list, gpd_list_node) { |
| if (gpd->provider == &np->fwnode) { |
| gpd->has_provider = false; |
| |
| if (!gpd->set_performance_state) |
| continue; |
| |
| dev_pm_opp_put_opp_table(gpd->opp_table); |
| dev_pm_opp_of_remove_table(&gpd->dev); |
| } |
| } |
| |
| list_del(&cp->link); |
| of_node_put(cp->node); |
| kfree(cp); |
| break; |
| } |
| } |
| mutex_unlock(&of_genpd_mutex); |
| mutex_unlock(&gpd_list_lock); |
| } |
| EXPORT_SYMBOL_GPL(of_genpd_del_provider); |
| |
| /** |
| * 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. |
| */ |
| static struct generic_pm_domain *genpd_get_from_provider( |
| struct of_phandle_args *genpdspec) |
| { |
| struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); |
| struct of_genpd_provider *provider; |
| |
| if (!genpdspec) |
| return ERR_PTR(-EINVAL); |
| |
| 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; |
| } |
| |
| /** |
| * of_genpd_add_device() - Add a device to an I/O PM domain |
| * @genpdspec: OF phandle args to use for look-up PM domain |
| * @dev: Device to be added. |
| * |
| * Looks-up an I/O PM domain based upon phandle args provided and adds |
| * the device to the PM domain. Returns a negative error code on failure. |
| */ |
| int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev) |
| { |
| struct generic_pm_domain *genpd; |
| int ret; |
| |
| mutex_lock(&gpd_list_lock); |
| |
| genpd = genpd_get_from_provider(genpdspec); |
| if (IS_ERR(genpd)) { |
| ret = PTR_ERR(genpd); |
| goto out; |
| } |
| |
| ret = genpd_add_device(genpd, dev, NULL); |
| |
| out: |
| mutex_unlock(&gpd_list_lock); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(of_genpd_add_device); |
| |
| /** |
| * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain. |
| * @parent_spec: OF phandle args to use for parent PM domain look-up |
| * @subdomain_spec: OF phandle args to use for subdomain look-up |
| * |
| * Looks-up a parent PM domain and subdomain based upon phandle args |
| * provided and adds the subdomain to the parent PM domain. Returns a |
| * negative error code on failure. |
| */ |
| int of_genpd_add_subdomain(struct of_phandle_args *parent_spec, |
| struct of_phandle_args *subdomain_spec) |
| { |
| struct generic_pm_domain *parent, *subdomain; |
| int ret; |
| |
| mutex_lock(&gpd_list_lock); |
| |
| parent = genpd_get_from_provider(parent_spec); |
| if (IS_ERR(parent)) { |
| ret = PTR_ERR(parent); |
| goto out; |
| } |
| |
| subdomain = genpd_get_from_provider(subdomain_spec); |
| if (IS_ERR(subdomain)) { |
| ret = PTR_ERR(subdomain); |
| goto out; |
| } |
| |
| ret = genpd_add_subdomain(parent, subdomain); |
| |
| out: |
| mutex_unlock(&gpd_list_lock); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(of_genpd_add_subdomain); |
| |
| /** |
| * of_genpd_remove_last - Remove the last PM domain registered for a provider |
| * @provider: Pointer to device structure associated with provider |
| * |
| * Find the last PM domain that was added by a particular provider and |
| * remove this PM domain from the list of PM domains. The provider is |
| * identified by the 'provider' device structure that is passed. The PM |
| * domain will only be removed, if the provider associated with domain |
| * has been removed. |
| * |
| * Returns a valid pointer to struct generic_pm_domain on success or |
| * ERR_PTR() on failure. |
| */ |
| struct generic_pm_domain *of_genpd_remove_last(struct device_node *np) |
| { |
| struct generic_pm_domain *gpd, *tmp, *genpd = ERR_PTR(-ENOENT); |
| int ret; |
| |
| if (IS_ERR_OR_NULL(np)) |
| return ERR_PTR(-EINVAL); |
| |
| mutex_lock(&gpd_list_lock); |
| list_for_each_entry_safe(gpd, tmp, &gpd_list, gpd_list_node) { |
| if (gpd->provider == &np->fwnode) { |
| ret = genpd_remove(gpd); |
| genpd = ret ? ERR_PTR(ret) : gpd; |
| break; |
| } |
| } |
| mutex_unlock(&gpd_list_lock); |
| |
| return genpd; |
| } |
| EXPORT_SYMBOL_GPL(of_genpd_remove_last); |
| |
| static void genpd_release_dev(struct device *dev) |
| { |
| kfree(dev); |
| } |
| |
| static struct bus_type genpd_bus_type = { |
| .name = "genpd", |
| }; |
| |
| /** |
| * 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 = dev_to_genpd(dev); |
| if (IS_ERR(pd)) |
| return; |
| |
| dev_dbg(dev, "removing from PM domain %s\n", pd->name); |
| |
| for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
| ret = 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); |
| |
| /* Unregister the device if it was created by genpd. */ |
| if (dev->bus == &genpd_bus_type) |
| device_unregister(dev); |
| } |
| |
| 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); |
| } |
| |
| static int __genpd_dev_pm_attach(struct device *dev, struct device_node *np, |
| unsigned int index, bool power_on) |
| { |
| struct of_phandle_args pd_args; |
| struct generic_pm_domain *pd; |
| int ret; |
| |
| ret = of_parse_phandle_with_args(np, "power-domains", |
| "#power-domain-cells", index, &pd_args); |
| if (ret < 0) |
| return ret; |
| |
| mutex_lock(&gpd_list_lock); |
| pd = genpd_get_from_provider(&pd_args); |
| of_node_put(pd_args.np); |
| if (IS_ERR(pd)) { |
| mutex_unlock(&gpd_list_lock); |
| dev_dbg(dev, "%s() failed to find PM domain: %ld\n", |
| __func__, PTR_ERR(pd)); |
| return driver_deferred_probe_check_state(dev); |
| } |
| |
| dev_dbg(dev, "adding to PM domain %s\n", pd->name); |
| |
| ret = genpd_add_device(pd, dev, NULL); |
| mutex_unlock(&gpd_list_lock); |
| |
| if (ret < 0) { |
| if (ret != -EPROBE_DEFER) |
| dev_err(dev, "failed to add to PM domain %s: %d", |
| pd->name, ret); |
| return ret; |
| } |
| |
| dev->pm_domain->detach = genpd_dev_pm_detach; |
| dev->pm_domain->sync = genpd_dev_pm_sync; |
| |
| if (power_on) { |
| genpd_lock(pd); |
| ret = genpd_power_on(pd, 0); |
| genpd_unlock(pd); |
| } |
| |
| if (ret) |
| genpd_remove_device(pd, dev); |
| |
| return ret ? -EPROBE_DEFER : 1; |
| } |
| |
| /** |
| * 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. |
| * |
| * Returns 1 on successfully attached PM domain, 0 when the device don't need a |
| * PM domain or when multiple power-domains exists for it, else a 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) |
| { |
| if (!dev->of_node) |
| return 0; |
| |
| /* |
| * Devices with multiple PM domains must be attached separately, as we |
| * can only attach one PM domain per device. |
| */ |
| if (of_count_phandle_with_args(dev->of_node, "power-domains", |
| "#power-domain-cells") != 1) |
| return 0; |
| |
| return __genpd_dev_pm_attach(dev, dev->of_node, 0, true); |
| } |
| EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); |
| |
| /** |
| * genpd_dev_pm_attach_by_id - Associate a device with one of its PM domains. |
| * @dev: The device used to lookup the PM domain. |
| * @index: The index of the PM domain. |
| * |
| * Parse device's OF node to find a PM domain specifier at the provided @index. |
| * If such is found, creates a virtual device and attaches it to the retrieved |
| * pm_domain ops. To deal with detaching of the virtual device, the ->detach() |
| * callback in the struct dev_pm_domain are assigned to genpd_dev_pm_detach(). |
| * |
| * Returns the created virtual device if successfully attached PM domain, NULL |
| * when the device don't need a PM domain, else an ERR_PTR() in case of |
| * failures. If a power-domain exists for the device, but cannot be found or |
| * turned on, then ERR_PTR(-EPROBE_DEFER) is returned to ensure that the device |
| * is not probed and to re-try again later. |
| */ |
| struct device *genpd_dev_pm_attach_by_id(struct device *dev, |
| unsigned int index) |
| { |
| struct device *virt_dev; |
| int num_domains; |
| int ret; |
| |
| if (!dev->of_node) |
| return NULL; |
| |
| /* Deal only with devices using multiple PM domains. */ |
| num_domains = of_count_phandle_with_args(dev->of_node, "power-domains", |
| "#power-domain-cells"); |
| if (num_domains < 2 || index >= num_domains) |
| return NULL; |
| |
| /* Allocate and register device on the genpd bus. */ |
| virt_dev = kzalloc(sizeof(*virt_dev), GFP_KERNEL); |
| if (!virt_dev) |
| return ERR_PTR(-ENOMEM); |
| |
| dev_set_name(virt_dev, "genpd:%u:%s", index, dev_name(dev)); |
| virt_dev->bus = &genpd_bus_type; |
| virt_dev->release = genpd_release_dev; |
| |
| ret = device_register(virt_dev); |
| if (ret) { |
| kfree(virt_dev); |
| return ERR_PTR(ret); |
| } |
| |
| /* Try to attach the device to the PM domain at the specified index. */ |
| ret = __genpd_dev_pm_attach(virt_dev, dev->of_node, index, false); |
| if (ret < 1) { |
| device_unregister(virt_dev); |
| return ret ? ERR_PTR(ret) : NULL; |
| } |
| |
| pm_runtime_enable(virt_dev); |
| genpd_queue_power_off_work(dev_to_genpd(virt_dev)); |
| |
| return virt_dev; |
| } |
| EXPORT_SYMBOL_GPL(genpd_dev_pm_attach_by_id); |
| |
| /** |
| * genpd_dev_pm_attach_by_name - Associate a device with one of its PM domains. |
| * @dev: The device used to lookup the PM domain. |
| * @name: The name of the PM domain. |
| * |
| * Parse device's OF node to find a PM domain specifier using the |
| * power-domain-names DT property. For further description see |
| * genpd_dev_pm_attach_by_id(). |
| */ |
| struct device *genpd_dev_pm_attach_by_name(struct device *dev, const char *name) |
| { |
| int index; |
| |
| if (!dev->of_node) |
| return NULL; |
| |
| index = of_property_match_string(dev->of_node, "power-domain-names", |
| name); |
| if (index < 0) |
| return NULL; |
| |
| return genpd_dev_pm_attach_by_id(dev, index); |
| } |
| |
| static const struct of_device_id idle_state_match[] = { |
| { .compatible = "domain-idle-state", }, |
| { } |
| }; |
| |
| static int genpd_parse_state(struct genpd_power_state *genpd_state, |
| struct device_node *state_node) |
| { |
| int err; |
| u32 residency; |
| u32 entry_latency, exit_latency; |
| |
| err = of_property_read_u32(state_node, "entry-latency-us", |
| &entry_latency); |
| if (err) { |
| pr_debug(" * %pOF missing entry-latency-us property\n", |
| state_node); |
| return -EINVAL; |
| } |
| |
| err = of_property_read_u32(state_node, "exit-latency-us", |
| &exit_latency); |
| if (err) { |
| pr_debug(" * %pOF missing exit-latency-us property\n", |
| state_node); |
| return -EINVAL; |
| } |
| |
| err = of_property_read_u32(state_node, "min-residency-us", &residency); |
| if (!err) |
| genpd_state->residency_ns = 1000 * residency; |
| |
| genpd_state->power_on_latency_ns = 1000 * exit_latency; |
| genpd_state->power_off_latency_ns = 1000 * entry_latency; |
| genpd_state->fwnode = &state_node->fwnode; |
| |
| return 0; |
| } |
| |
| static int genpd_iterate_idle_states(struct device_node *dn, |
| struct genpd_power_state *states) |
| { |
| int ret; |
| struct of_phandle_iterator it; |
| struct device_node *np; |
| int i = 0; |
| |
| ret = of_count_phandle_with_args(dn, "domain-idle-states", NULL); |
| if (ret <= 0) |
| return ret; |
| |
| /* Loop over the phandles until all the requested entry is found */ |
| of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) { |
| np = it.node; |
| if (!of_match_node(idle_state_match, np)) |
| continue; |
| if (states) { |
| ret = genpd_parse_state(&states[i], np); |
| if (ret) { |
| pr_err("Parsing idle state node %pOF failed with err %d\n", |
| np, ret); |
| of_node_put(np); |
| return ret; |
| } |
| } |
| i++; |
| } |
| |
| return i; |
| } |
| |
| /** |
| * of_genpd_parse_idle_states: Return array of idle states for the genpd. |
| * |
| * @dn: The genpd device node |
| * @states: The pointer to which the state array will be saved. |
| * @n: The count of elements in the array returned from this function. |
| * |
| * Returns the device states parsed from the OF node. The memory for the states |
| * is allocated by this function and is the responsibility of the caller to |
| * free the memory after use. If any or zero compatible domain idle states is |
| * found it returns 0 and in case of errors, a negative error code is returned. |
| */ |
| int of_genpd_parse_idle_states(struct device_node *dn, |
| struct genpd_power_state **states, int *n) |
| { |
| struct genpd_power_state *st; |
| int ret; |
| |
| ret = genpd_iterate_idle_states(dn, NULL); |
| if (ret < 0) |
| return ret; |
| |
| if (!ret) { |
| *states = NULL; |
| *n = 0; |
| return 0; |
| } |
| |
| st = kcalloc(ret, sizeof(*st), GFP_KERNEL); |
| if (!st) |
| return -ENOMEM; |
| |
| ret = genpd_iterate_idle_states(dn, st); |
| if (ret <= 0) { |
| kfree(st); |
| return ret < 0 ? ret : -EINVAL; |
| } |
| |
| *states = st; |
| *n = ret; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states); |
| |
| /** |
| * pm_genpd_opp_to_performance_state - Gets performance state of the genpd from its OPP node. |
| * |
| * @genpd_dev: Genpd's device for which the performance-state needs to be found. |
| * @opp: struct dev_pm_opp of the OPP for which we need to find performance |
| * state. |
| * |
| * Returns performance state encoded in the OPP of the genpd. This calls |
| * platform specific genpd->opp_to_performance_state() callback to translate |
| * power domain OPP to performance state. |
| * |
| * Returns performance state on success and 0 on failure. |
| */ |
| unsigned int pm_genpd_opp_to_performance_state(struct device *genpd_dev, |
| struct dev_pm_opp *opp) |
| { |
| struct generic_pm_domain *genpd = NULL; |
| int state; |
| |
| genpd = container_of(genpd_dev, struct generic_pm_domain, dev); |
| |
| if (unlikely(!genpd->opp_to_performance_state)) |
| return 0; |
| |
| genpd_lock(genpd); |
| state = genpd->opp_to_performance_state(genpd, opp); |
| genpd_unlock(genpd); |
| |
| return state; |
| } |
| EXPORT_SYMBOL_GPL(pm_genpd_opp_to_performance_state); |
| |
| static int __init genpd_bus_init(void) |
| { |
| return bus_register(&genpd_bus_type); |
| } |
| core_initcall(genpd_bus_init); |
| |
| #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
| |
| |
| /*** debugfs support ***/ |
| |
| #ifdef CONFIG_DEBUG_FS |
| #include <linux/pm.h> |
| #include <linux/device.h> |
| #include <linux/debugfs.h> |
| #include <linux/seq_file.h> |
| #include <linux/init.h> |
| #include <linux/kobject.h> |
| static struct dentry *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 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; |
| char state[16]; |
| int ret; |
| |
| ret = genpd_lock_interruptible(genpd); |
| if (ret) |
| return -ERESTARTSYS; |
| |
| if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
| goto exit; |
| if (!genpd_status_on(genpd)) |
| snprintf(state, sizeof(state), "%s-%u", |
| status_lookup[genpd->status], genpd->state_idx); |
| else |
| snprintf(state, sizeof(state), "%s", |
| status_lookup[genpd->status]); |
| seq_printf(s, "%-30s %-15s ", genpd->name, state); |
| |
| /* |
| * 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, |
| genpd_is_irq_safe(genpd) ? |
| GFP_ATOMIC : 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: |
| genpd_unlock(genpd); |
| |
| return 0; |
| } |
| |
| static int 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 = genpd_summary_one(s, genpd); |
| if (ret) |
| break; |
| } |
| mutex_unlock(&gpd_list_lock); |
| |
| return ret; |
| } |
| |
| static int status_show(struct seq_file *s, void *data) |
| { |
| static const char * const status_lookup[] = { |
| [GPD_STATE_ACTIVE] = "on", |
| [GPD_STATE_POWER_OFF] = "off" |
| }; |
| |
| struct generic_pm_domain *genpd = s->private; |
| int ret = 0; |
| |
| ret = genpd_lock_interruptible(genpd); |
| if (ret) |
| return -ERESTARTSYS; |
| |
| if (WARN_ON_ONCE(genpd->status >= ARRAY_SIZE(status_lookup))) |
| goto exit; |
| |
| if (genpd->status == GPD_STATE_POWER_OFF) |
| seq_printf(s, "%s-%u\n", status_lookup[genpd->status], |
| genpd->state_idx); |
| else |
| seq_printf(s, "%s\n", status_lookup[genpd->status]); |
| exit: |
| genpd_unlock(genpd); |
| return ret; |
| } |
| |
| static int sub_domains_show(struct seq_file *s, void *data) |
| { |
| struct generic_pm_domain *genpd = s->private; |
| struct gpd_link *link; |
| int ret = 0; |
| |
| ret = genpd_lock_interruptible(genpd); |
| if (ret) |
| return -ERESTARTSYS; |
| |
| list_for_each_entry(link, &genpd->master_links, master_node) |
| seq_printf(s, "%s\n", link->slave->name); |
| |
| genpd_unlock(genpd); |
| return ret; |
| } |
| |
| static int idle_states_show(struct seq_file *s, void *data) |
| { |
| struct generic_pm_domain *genpd = s->private; |
| unsigned int i; |
| int ret = 0; |
| |
| ret = genpd_lock_interruptible(genpd); |
| if (ret) |
| return -ERESTARTSYS; |
| |
| seq_puts(s, "State Time Spent(ms)\n"); |
| |
| for (i = 0; i < genpd->state_count; i++) { |
| ktime_t delta = 0; |
| s64 msecs; |
| |
| if ((genpd->status == GPD_STATE_POWER_OFF) && |
| (genpd->state_idx == i)) |
| delta = ktime_sub(ktime_get(), genpd->accounting_time); |
| |
| msecs = ktime_to_ms( |
| ktime_add(genpd->states[i].idle_time, delta)); |
| seq_printf(s, "S%-13i %lld\n", i, msecs); |
| } |
| |
| genpd_unlock(genpd); |
| return ret; |
| } |
| |
| static int active_time_show(struct seq_file *s, void *data) |
| { |
| struct generic_pm_domain *genpd = s->private; |
| ktime_t delta = 0; |
| int ret = 0; |
| |
| ret = genpd_lock_interruptible(genpd); |
| if (ret) |
| return -ERESTARTSYS; |
| |
| if (genpd->status == GPD_STATE_ACTIVE) |
| delta = ktime_sub(ktime_get(), genpd->accounting_time); |
| |
| seq_printf(s, "%lld ms\n", ktime_to_ms( |
| ktime_add(genpd->on_time, delta))); |
| |
| genpd_unlock(genpd); |
| return ret; |
| } |
| |
| static int total_idle_time_show(struct seq_file *s, void *data) |
| { |
| struct generic_pm_domain *genpd = s->private; |
| ktime_t delta = 0, total = 0; |
| unsigned int i; |
| int ret = 0; |
| |
| ret = genpd_lock_interruptible(genpd); |
| if (ret) |
| return -ERESTARTSYS; |
| |
| for (i = 0; i < genpd->state_count; i++) { |
| |
| if ((genpd->status == GPD_STATE_POWER_OFF) && |
| (genpd->state_idx == i)) |
| delta = ktime_sub(ktime_get(), genpd->accounting_time); |
| |
| total = ktime_add(total, genpd->states[i].idle_time); |
| } |
| total = ktime_add(total, delta); |
| |
| seq_printf(s, "%lld ms\n", ktime_to_ms(total)); |
| |
| genpd_unlock(genpd); |
| return ret; |
| } |
| |
| |
| static int devices_show(struct seq_file *s, void *data) |
| { |
| struct generic_pm_domain *genpd = s->private; |
| struct pm_domain_data *pm_data; |
| const char *kobj_path; |
| int ret = 0; |
| |
| ret = genpd_lock_interruptible(genpd); |
| if (ret) |
| return -ERESTARTSYS; |
| |
| list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
| kobj_path = kobject_get_path(&pm_data->dev->kobj, |
| genpd_is_irq_safe(genpd) ? |
| GFP_ATOMIC : GFP_KERNEL); |
| if (kobj_path == NULL) |
| continue; |
| |
| seq_printf(s, "%s\n", kobj_path); |
| kfree(kobj_path); |
| } |
| |
| genpd_unlock(genpd); |
| return ret; |
| } |
| |
| static int perf_state_show(struct seq_file *s, void *data) |
| { |
| struct generic_pm_domain *genpd = s->private; |
| |
| if (genpd_lock_interruptible(genpd)) |
| return -ERESTARTSYS; |
| |
| seq_printf(s, "%u\n", genpd->performance_state); |
| |
| genpd_unlock(genpd); |
| return 0; |
| } |
| |
| DEFINE_SHOW_ATTRIBUTE(summary); |
| DEFINE_SHOW_ATTRIBUTE(status); |
| DEFINE_SHOW_ATTRIBUTE(sub_domains); |
| DEFINE_SHOW_ATTRIBUTE(idle_states); |
| DEFINE_SHOW_ATTRIBUTE(active_time); |
| DEFINE_SHOW_ATTRIBUTE(total_idle_time); |
| DEFINE_SHOW_ATTRIBUTE(devices); |
| DEFINE_SHOW_ATTRIBUTE(perf_state); |
| |
| static int __init genpd_debug_init(void) |
| { |
| struct dentry *d; |
| struct generic_pm_domain *genpd; |
| |
| genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); |
| |
| debugfs_create_file("pm_genpd_summary", S_IRUGO, genpd_debugfs_dir, |
| NULL, &summary_fops); |
| |
| list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
| d = debugfs_create_dir(genpd->name, genpd_debugfs_dir); |
| |
| debugfs_create_file("current_state", 0444, |
| d, genpd, &status_fops); |
| debugfs_create_file("sub_domains", 0444, |
| d, genpd, &sub_domains_fops); |
| debugfs_create_file("idle_states", 0444, |
| d, genpd, &idle_states_fops); |
| debugfs_create_file("active_time", 0444, |
| d, genpd, &active_time_fops); |
| debugfs_create_file("total_idle_time", 0444, |
| d, genpd, &total_idle_time_fops); |
| debugfs_create_file("devices", 0444, |
| d, genpd, &devices_fops); |
| if (genpd->set_performance_state) |
| debugfs_create_file("perf_state", 0444, |
| d, genpd, &perf_state_fops); |
| } |
| |
| return 0; |
| } |
| late_initcall(genpd_debug_init); |
| |
| static void __exit genpd_debug_exit(void) |
| { |
| debugfs_remove_recursive(genpd_debugfs_dir); |
| } |
| __exitcall(genpd_debug_exit); |
| #endif /* CONFIG_DEBUG_FS */ |