diff options
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/power/Makefile | 1 | ||||
| -rw-r--r-- | drivers/base/power/domain.c | 3399 | ||||
| -rw-r--r-- | drivers/base/power/domain_governor.c | 418 |
3 files changed, 0 insertions, 3818 deletions
diff --git a/drivers/base/power/Makefile b/drivers/base/power/Makefile index 8fdd0073eeeb..01f11629d241 100644 --- a/drivers/base/power/Makefile +++ b/drivers/base/power/Makefile @@ -2,7 +2,6 @@ obj-$(CONFIG_PM) += sysfs.o generic_ops.o common.o qos.o runtime.o wakeirq.o obj-$(CONFIG_PM_SLEEP) += main.o wakeup.o wakeup_stats.o obj-$(CONFIG_PM_TRACE_RTC) += trace.o -obj-$(CONFIG_PM_GENERIC_DOMAINS) += domain.o domain_governor.o obj-$(CONFIG_HAVE_CLK) += clock_ops.o obj-$(CONFIG_PM_QOS_KUNIT_TEST) += qos-test.o diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c deleted file mode 100644 index 9ee1bf2ece10..000000000000 --- a/drivers/base/power/domain.c +++ /dev/null @@ -1,3399 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * drivers/base/power/domain.c - Common code related to device power domains. - * - * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. - */ -#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 <linux/cpu.h> -#include <linux/debugfs.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 == GENPD_STATE_ON) -#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) -#define genpd_is_cpu_domain(genpd) (genpd->flags & GENPD_FLAG_CPU_DOMAIN) -#define genpd_is_rpm_always_on(genpd) (genpd->flags & GENPD_FLAG_RPM_ALWAYS_ON) -#define genpd_is_opp_table_fw(genpd) (genpd->flags & GENPD_FLAG_OPP_TABLE_FW) - -static inline bool irq_safe_dev_in_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 domain, which - * callbacks are allowed to sleep. This indicates a suboptimal - * configuration for PM, but it doesn't matter for an always on domain. - */ - if (genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd)) - return ret; - - if (ret) - dev_warn_once(dev, "PM domain %s will not be powered off\n", - genpd->name); - - return ret; -} - -static int genpd_runtime_suspend(struct device *dev); - -/* - * 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 *dev_to_genpd_safe(struct device *dev) -{ - if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain)) - return NULL; - - /* A genpd's always have its ->runtime_suspend() callback assigned. */ - if (dev->pm_domain->ops.runtime_suspend == genpd_runtime_suspend) - return pd_to_genpd(dev->pm_domain); - - return NULL; -} - -/* - * 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 struct dentry *genpd_debugfs_dir; - -static void genpd_debug_add(struct generic_pm_domain *genpd); - -static void genpd_debug_remove(struct generic_pm_domain *genpd) -{ - if (!genpd_debugfs_dir) - return; - - debugfs_lookup_and_remove(genpd->name, genpd_debugfs_dir); -} - -static void genpd_update_accounting(struct generic_pm_domain *genpd) -{ - u64 delta, now; - - now = ktime_get_mono_fast_ns(); - if (now <= genpd->accounting_time) - return; - - delta = 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 == GENPD_STATE_ON) - genpd->states[genpd->state_idx].idle_time += delta; - else - genpd->on_time += delta; - - genpd->accounting_time = now; -} -#else -static inline void genpd_debug_add(struct generic_pm_domain *genpd) {} -static inline void genpd_debug_remove(struct generic_pm_domain *genpd) {} -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 parent genpd->lock, which is already taken. - * - * Also note that link->performance_state (subdomain's performance state - * requirement to parent domain) is different from - * link->child->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->parent_links, parent_node) { - if (link->performance_state > state) - state = link->performance_state; - } - - return state; -} - -static int genpd_xlate_performance_state(struct generic_pm_domain *genpd, - struct generic_pm_domain *parent, - unsigned int pstate) -{ - if (!parent->set_performance_state) - return pstate; - - return dev_pm_opp_xlate_performance_state(genpd->opp_table, - parent->opp_table, - pstate); -} - -static int _genpd_set_performance_state(struct generic_pm_domain *genpd, - unsigned int state, int depth) -{ - struct generic_pm_domain *parent; - struct gpd_link *link; - int parent_state, ret; - - if (state == genpd->performance_state) - return 0; - - /* Propagate to parents of genpd */ - list_for_each_entry(link, &genpd->child_links, child_node) { - parent = link->parent; - - /* Find parent's performance state */ - ret = genpd_xlate_performance_state(genpd, parent, state); - if (unlikely(ret < 0)) - goto err; - - parent_state = ret; - - genpd_lock_nested(parent, depth + 1); - - link->prev_performance_state = link->performance_state; - link->performance_state = parent_state; - parent_state = _genpd_reeval_performance_state(parent, - parent_state); - ret = _genpd_set_performance_state(parent, parent_state, depth + 1); - if (ret) - link->performance_state = link->prev_performance_state; - - genpd_unlock(parent); - - if (ret) - goto err; - } - - if (genpd->set_performance_state) { - 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->child_links, - child_node) { - parent = link->parent; - - genpd_lock_nested(parent, depth + 1); - - parent_state = link->prev_performance_state; - link->performance_state = parent_state; - - parent_state = _genpd_reeval_performance_state(parent, - parent_state); - if (_genpd_set_performance_state(parent, parent_state, depth + 1)) { - pr_err("%s: Failed to roll back to %d performance state\n", - parent->name, parent_state); - } - - genpd_unlock(parent); - } - - return ret; -} - -static int genpd_set_performance_state(struct device *dev, unsigned int state) -{ - struct generic_pm_domain *genpd = dev_to_genpd(dev); - struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev); - unsigned int prev_state; - int ret; - - prev_state = gpd_data->performance_state; - if (prev_state == state) - return 0; - - 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_state; - - return ret; -} - -static int genpd_drop_performance_state(struct device *dev) -{ - unsigned int prev_state = dev_gpd_data(dev)->performance_state; - - if (!genpd_set_performance_state(dev, 0)) - return prev_state; - - return 0; -} - -static void genpd_restore_performance_state(struct device *dev, - unsigned int state) -{ - if (state) - genpd_set_performance_state(dev, state); -} - -static int genpd_dev_pm_set_performance_state(struct device *dev, - unsigned int state) -{ - struct generic_pm_domain *genpd = dev_to_genpd(dev); - int ret = 0; - - genpd_lock(genpd); - if (pm_runtime_suspended(dev)) { - dev_gpd_data(dev)->rpm_pstate = state; - } else { - ret = genpd_set_performance_state(dev, state); - if (!ret) - dev_gpd_data(dev)->rpm_pstate = 0; - } - genpd_unlock(genpd); - - 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; - - genpd = dev_to_genpd_safe(dev); - if (!genpd) - return -ENODEV; - - if (WARN_ON(!dev->power.subsys_data || - !dev->power.subsys_data->domain_data)) - return -EINVAL; - - return genpd_dev_pm_set_performance_state(dev, state); -} -EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state); - -/** - * dev_pm_genpd_set_next_wakeup - Notify PM framework of an impending wakeup. - * - * @dev: Device to handle - * @next: impending interrupt/wakeup for the device - * - * - * Allow devices to inform of the next wakeup. It's assumed that the users - * guarantee that the genpd wouldn't be detached while this routine is getting - * called. Additionally, it's also assumed that @dev isn't runtime suspended - * (RPM_SUSPENDED)." - * Although devices are expected to update the next_wakeup after the end of - * their usecase as well, it is possible the devices themselves may not know - * about that, so stale @next will be ignored when powering off the domain. - */ -void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next) -{ - struct generic_pm_domain *genpd; - struct gpd_timing_data *td; - - genpd = dev_to_genpd_safe(dev); - if (!genpd) - return; - - td = to_gpd_data(dev->power.subsys_data->domain_data)->td; - if (td) - td->next_wakeup = next; -} -EXPORT_SYMBOL_GPL(dev_pm_genpd_set_next_wakeup); - -/** - * dev_pm_genpd_get_next_hrtimer - Return the next_hrtimer for the genpd - * @dev: A device that is attached to the genpd. - * - * This routine should typically be called for a device, at the point of when a - * GENPD_NOTIFY_PRE_OFF notification has been sent for it. - * - * Returns the aggregated value of the genpd's next hrtimer or KTIME_MAX if no - * valid value have been set. - */ -ktime_t dev_pm_genpd_get_next_hrtimer(struct device *dev) -{ - struct generic_pm_domain *genpd; - - genpd = dev_to_genpd_safe(dev); - if (!genpd) - return KTIME_MAX; - - if (genpd->gd) - return genpd->gd->next_hrtimer; - - return KTIME_MAX; -} -EXPORT_SYMBOL_GPL(dev_pm_genpd_get_next_hrtimer); - -/* - * dev_pm_genpd_synced_poweroff - Next power off should be synchronous - * - * @dev: A device that is attached to the genpd. - * - * Allows a consumer of the genpd to notify the provider that the next power off - * should be synchronous. - * - * It is assumed that the users guarantee that the genpd wouldn't be detached - * while this routine is getting called. - */ -void dev_pm_genpd_synced_poweroff(struct device *dev) -{ - struct generic_pm_domain *genpd; - - genpd = dev_to_genpd_safe(dev); - if (!genpd) - return; - - genpd_lock(genpd); - genpd->synced_poweroff = true; - genpd_unlock(genpd); -} -EXPORT_SYMBOL_GPL(dev_pm_genpd_synced_poweroff); - -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; - - /* Notify consumers that we are about to power on. */ - ret = raw_notifier_call_chain_robust(&genpd->power_notifiers, - GENPD_NOTIFY_PRE_ON, - GENPD_NOTIFY_OFF, NULL); - ret = notifier_to_errno(ret); - if (ret) - return ret; - - if (!genpd->power_on) - goto out; - - timed = timed && genpd->gd && !genpd->states[state_idx].fwnode; - if (!timed) { - ret = genpd->power_on(genpd); - if (ret) - goto err; - - goto out; - } - - time_start = ktime_get(); - ret = genpd->power_on(genpd); - if (ret) - goto err; - - elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); - if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns) - goto out; - - genpd->states[state_idx].power_on_latency_ns = elapsed_ns; - genpd->gd->max_off_time_changed = true; - pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", - genpd->name, "on", elapsed_ns); - -out: - raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_ON, NULL); - genpd->synced_poweroff = false; - return 0; -err: - raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF, - NULL); - 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; - - /* Notify consumers that we are about to power off. */ - ret = raw_notifier_call_chain_robust(&genpd->power_notifiers, - GENPD_NOTIFY_PRE_OFF, - GENPD_NOTIFY_ON, NULL); - ret = notifier_to_errno(ret); - if (ret) - return ret; - - if (!genpd->power_off) - goto out; - - timed = timed && genpd->gd && !genpd->states[state_idx].fwnode; - if (!timed) { - ret = genpd->power_off(genpd); - if (ret) - goto busy; - - goto out; - } - - time_start = ktime_get(); - ret = genpd->power_off(genpd); - if (ret) - goto busy; - - elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); - if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns) - goto out; - - genpd->states[state_idx].power_off_latency_ns = elapsed_ns; - genpd->gd->max_off_time_changed = true; - pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", - genpd->name, "off", elapsed_ns); - -out: - raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF, - NULL); - return 0; -busy: - raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_ON, NULL); - return ret; -} - -/** - * 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. - * @depth: nesting count for lockdep. - * - * 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; - int ret; - - /* - * 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) || - genpd_is_rpm_always_on(genpd) || - atomic_read(&genpd->sd_count) > 0) - return -EBUSY; - - /* - * The children must be in their deepest (powered-off) states to allow - * the parent to be powered off. Note that, there's no need for - * additional locking, as powering on a child, requires the parent's - * lock to be acquired first. - */ - list_for_each_entry(link, &genpd->parent_links, parent_node) { - struct generic_pm_domain *child = link->child; - if (child->state_idx < child->state_count - 1) - return -EBUSY; - } - - list_for_each_entry(pdd, &genpd->dev_list, list_node) { - /* - * 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_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; - - /* Don't power off, if a child domain is waiting to power on. */ - if (atomic_read(&genpd->sd_count) > 0) - return -EBUSY; - - ret = _genpd_power_off(genpd, true); - if (ret) { - genpd->states[genpd->state_idx].rejected++; - return ret; - } - - genpd->status = GENPD_STATE_OFF; - genpd_update_accounting(genpd); - genpd->states[genpd->state_idx].usage++; - - list_for_each_entry(link, &genpd->child_links, child_node) { - genpd_sd_counter_dec(link->parent); - genpd_lock_nested(link->parent, depth + 1); - genpd_power_off(link->parent, false, depth + 1); - genpd_unlock(link->parent); - } - - return 0; -} - -/** - * genpd_power_on - Restore power to a given PM domain and its parents. - * @genpd: PM domain to power up. - * @depth: nesting count for lockdep. - * - * Restore power to @genpd and all of its parents 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 parents' .power_on() callbacks fiddles - * with it. - */ - list_for_each_entry(link, &genpd->child_links, child_node) { - struct generic_pm_domain *parent = link->parent; - - genpd_sd_counter_inc(parent); - - genpd_lock_nested(parent, depth + 1); - ret = genpd_power_on(parent, depth + 1); - genpd_unlock(parent); - - if (ret) { - genpd_sd_counter_dec(parent); - goto err; - } - } - - ret = _genpd_power_on(genpd, true); - if (ret) - goto err; - - genpd->status = GENPD_STATE_ON; - genpd_update_accounting(genpd); - - return 0; - - err: - list_for_each_entry_continue_reverse(link, - &genpd->child_links, - child_node) { - genpd_sd_counter_dec(link->parent); - genpd_lock_nested(link->parent, depth + 1); - genpd_power_off(link->parent, false, depth + 1); - genpd_unlock(link->parent); - } - - return ret; -} - -static int genpd_dev_pm_start(struct device *dev) -{ - struct generic_pm_domain *genpd = dev_to_genpd(dev); - - return genpd_start_dev(genpd, 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 = ERR_PTR(-ENODATA); - struct pm_domain_data *pdd; - struct gpd_timing_data *td; - - spin_lock_irq(&dev->power.lock); - - pdd = dev->power.subsys_data ? - dev->power.subsys_data->domain_data : NULL; - if (pdd) { - td = to_gpd_data(pdd)->td; - if (td) { - td->constraint_changed = true; - genpd = dev_to_genpd(dev); - } - } - - spin_unlock_irq(&dev->power.lock); - - if (!IS_ERR(genpd)) { - genpd_lock(genpd); - genpd->gd->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 generic_pm_domain_data *gpd_data = dev_gpd_data(dev); - struct gpd_timing_data *td = gpd_data->td; - bool runtime_pm = pm_runtime_enabled(dev); - ktime_t time_start = 0; - 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. */ - if (td && 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 (td && 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->gd->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_sleep_domain(dev, genpd)) - return 0; - - genpd_lock(genpd); - genpd_power_off(genpd, true, 0); - gpd_data->rpm_pstate = genpd_drop_performance_state(dev); - 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 generic_pm_domain_data *gpd_data = dev_gpd_data(dev); - struct gpd_timing_data *td = gpd_data->td; - bool timed = td && pm_runtime_enabled(dev); - ktime_t time_start = 0; - s64 elapsed_ns; - int ret; - - 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_sleep_domain(dev, genpd)) - goto out; - - genpd_lock(genpd); - genpd_restore_performance_state(dev, gpd_data->rpm_pstate); - ret = genpd_power_on(genpd, 0); - genpd_unlock(genpd); - - if (ret) - return ret; - - out: - /* Measure resume latency. */ - if (timed) - 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) { - 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->gd->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) || genpd_is_irq_safe(genpd)) { - genpd_lock(genpd); - genpd_power_off(genpd, true, 0); - gpd_data->rpm_pstate = genpd_drop_performance_state(dev); - 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); - -#ifdef CONFIG_PM_SLEEP - -/** - * genpd_sync_power_off - Synchronously power off a PM domain and its parents. - * @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 parents. - * - * 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; - - /* Check that the children are in their deepest (powered-off) state. */ - list_for_each_entry(link, &genpd->parent_links, parent_node) { - struct generic_pm_domain *child = link->child; - if (child->state_idx < child->state_count - 1) - return; - } - - /* Choose the deepest state when suspending */ - genpd->state_idx = genpd->state_count - 1; - if (_genpd_power_off(genpd, false)) - return; - - genpd->status = GENPD_STATE_OFF; - - list_for_each_entry(link, &genpd->child_links, child_node) { - genpd_sd_counter_dec(link->parent); - - if (use_lock) - genpd_lock_nested(link->parent, depth + 1); - - genpd_sync_power_off(link->parent, use_lock, depth + 1); - - if (use_lock) - genpd_unlock(link->parent); - } -} - -/** - * genpd_sync_power_on - Synchronously power on a PM domain and its parents. - * @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->child_links, child_node) { - genpd_sd_counter_inc(link->parent); - - if (use_lock) - genpd_lock_nested(link->parent, depth + 1); - - genpd_sync_power_on(link->parent, use_lock, depth + 1); - - if (use_lock) - genpd_unlock(link->parent); - } - - _genpd_power_on(genpd, false); - genpd->status = GENPD_STATE_ON; -} - -/** - * 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; - - 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. - * @suspend_noirq: Generic suspend_noirq callback. - * @resume_noirq: Generic resume_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, - int (*suspend_noirq)(struct device *dev), - int (*resume_noirq)(struct device *dev)) -{ - struct generic_pm_domain *genpd; - int ret = 0; - - genpd = dev_to_genpd(dev); - if (IS_ERR(genpd)) - return -EINVAL; - - ret = suspend_noirq(dev); - if (ret) - return ret; - - if (device_wakeup_path(dev) && 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) { - 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, - pm_generic_suspend_noirq, - pm_generic_resume_noirq); -} - -/** - * genpd_finish_resume - Completion of resume of device in an I/O PM domain. - * @dev: Device to resume. - * @resume_noirq: Generic resume_noirq callback. - * - * Restore power to the device's PM domain, if necessary, and start the device. - */ -static int genpd_finish_resume(struct device *dev, - int (*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 (device_wakeup_path(dev) && genpd_is_active_wakeup(genpd)) - return 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_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) -{ - dev_dbg(dev, "%s()\n", __func__); - - return genpd_finish_resume(dev, pm_generic_resume_noirq); -} - -/** - * 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) -{ - dev_dbg(dev, "%s()\n", __func__); - - return genpd_finish_suspend(dev, - pm_generic_freeze_noirq, - pm_generic_thaw_noirq); -} - -/** - * 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) -{ - dev_dbg(dev, "%s()\n", __func__); - - return genpd_finish_resume(dev, pm_generic_thaw_noirq); -} - -/** - * 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, - pm_generic_poweroff_noirq, - pm_generic_restore_noirq); -} - -/** - * 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) -{ - dev_dbg(dev, "%s()\n", __func__); - - return genpd_finish_resume(dev, pm_generic_restore_noirq); -} - -/** - * 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); -} - -static void genpd_switch_state(struct device *dev, bool suspend) -{ - struct generic_pm_domain *genpd; - bool use_lock; - - genpd = dev_to_genpd_safe(dev); - if (!genpd) - return; - - use_lock = genpd_is_irq_safe(genpd); - - if (use_lock) - genpd_lock(genpd); - - if (suspend) { - genpd->suspended_count++; - genpd_sync_power_off(genpd, use_lock, 0); - } else { - genpd_sync_power_on(genpd, use_lock, 0); - genpd->suspended_count--; - } - - if (use_lock) - genpd_unlock(genpd); -} - -/** - * dev_pm_genpd_suspend - Synchronously try to suspend the genpd for @dev - * @dev: The device that is attached to the genpd, that can be suspended. - * - * This routine should typically be called for a device that needs to be - * suspended during the syscore suspend phase. It may also be called during - * suspend-to-idle to suspend a corresponding CPU device that is attached to a - * genpd. - */ -void dev_pm_genpd_suspend(struct device *dev) -{ - genpd_switch_state(dev, true); -} -EXPORT_SYMBOL_GPL(dev_pm_genpd_suspend); - -/** - * dev_pm_genpd_resume - Synchronously try to resume the genpd for @dev - * @dev: The device that is attached to the genpd, which needs to be resumed. - * - * This routine should typically be called for a device that needs to be resumed - * during the syscore resume phase. It may also be called during suspend-to-idle - * to resume a corresponding CPU device that is attached to a genpd. - */ -void dev_pm_genpd_resume(struct device *dev) -{ - genpd_switch_state(dev, false); -} -EXPORT_SYMBOL_GPL(dev_pm_genpd_resume); - -#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, - bool has_governor) -{ - struct generic_pm_domain_data *gpd_data; - struct gpd_timing_data *td; - 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; - } - - gpd_data->base.dev = dev; - gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; - - /* Allocate data used by a governor. */ - if (has_governor) { - td = kzalloc(sizeof(*td), GFP_KERNEL); - if (!td) { - ret = -ENOMEM; - goto err_free; - } - - td->constraint_changed = true; - td->effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; - td->next_wakeup = KTIME_MAX; - gpd_data->td = td; - } - - spin_lock_irq(&dev->power.lock); - - if (dev->power.subsys_data->domain_data) - ret = -EINVAL; - else - dev->power.subsys_data->domain_data = &gpd_data->base; - - spin_unlock_irq(&dev->power.lock); - - if (ret) - goto err_free; - - return gpd_data; - - err_free: - kfree(gpd_data->td); - 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->td); - kfree(gpd_data); - dev_pm_put_subsys_data(dev); -} - -static void genpd_update_cpumask(struct generic_pm_domain *genpd, - int cpu, bool set, unsigned int depth) -{ - struct gpd_link *link; - - if (!genpd_is_cpu_domain(genpd)) - return; - - list_for_each_entry(link, &genpd->child_links, child_node) { - struct generic_pm_domain *parent = link->parent; - - genpd_lock_nested(parent, depth + 1); - genpd_update_cpumask(parent, cpu, set, depth + 1); - genpd_unlock(parent); - } - - if (set) - cpumask_set_cpu(cpu, genpd->cpus); - else - cpumask_clear_cpu(cpu, genpd->cpus); -} - -static void genpd_set_cpumask(struct generic_pm_domain *genpd, int cpu) -{ - if (cpu >= 0) - genpd_update_cpumask(genpd, cpu, true, 0); -} - -static void genpd_clear_cpumask(struct generic_pm_domain *genpd, int cpu) -{ - if (cpu >= 0) - genpd_update_cpumask(genpd, cpu, false, 0); -} - -static int genpd_get_cpu(struct generic_pm_domain *genpd, struct device *dev) -{ - int cpu; - - if (!genpd_is_cpu_domain(genpd)) - return -1; - - for_each_possible_cpu(cpu) { - if (get_cpu_device(cpu) == dev) - return cpu; - } - - return -1; -} - -static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, - struct device *base_dev) -{ - struct genpd_governor_data *gd = genpd->gd; - struct generic_pm_domain_data *gpd_data; - int ret; - - dev_dbg(dev, "%s()\n", __func__); - - gpd_data = genpd_alloc_dev_data(dev, gd); - if (IS_ERR(gpd_data)) - return PTR_ERR(gpd_data); - - gpd_data->cpu = genpd_get_cpu(genpd, base_dev); - - ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; - if (ret) - goto out; - - genpd_lock(genpd); - - genpd_set_cpumask(genpd, gpd_data->cpu); - dev_pm_domain_set(dev, &genpd->domain); - - genpd->device_count++; - if (gd) - gd->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, - DEV_PM_QOS_RESUME_LATENCY); - - 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; - - if (!genpd || !dev) - return -EINVAL; - - mutex_lock(&gpd_list_lock); - ret = genpd_add_device(genpd, dev, dev); - 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, - DEV_PM_QOS_RESUME_LATENCY); - - genpd_lock(genpd); - - if (genpd->prepared_count > 0) { - ret = -EAGAIN; - goto out; - } - - genpd->device_count--; - if (genpd->gd) - genpd->gd->max_off_time_changed = true; - - genpd_clear_cpumask(genpd, gpd_data->cpu); - 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, DEV_PM_QOS_RESUME_LATENCY); - - 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 = dev_to_genpd_safe(dev); - - if (!genpd) - return -EINVAL; - - return genpd_remove_device(genpd, dev); -} -EXPORT_SYMBOL_GPL(pm_genpd_remove_device); - -/** - * dev_pm_genpd_add_notifier - Add a genpd power on/off notifier for @dev - * - * @dev: Device that should be associated with the notifier - * @nb: The notifier block to register - * - * Users may call this function to add a genpd power on/off notifier for an - * attached @dev. Only one notifier per device is allowed. The notifier is - * sent when genpd is powering on/off the PM domain. - * - * It is assumed that the user 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_add_notifier(struct device *dev, struct notifier_block *nb) -{ - struct generic_pm_domain *genpd; - struct generic_pm_domain_data *gpd_data; - int ret; - - genpd = dev_to_genpd_safe(dev); - if (!genpd) - return -ENODEV; - - if (WARN_ON(!dev->power.subsys_data || - !dev->power.subsys_data->domain_data)) - return -EINVAL; - - gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); - if (gpd_data->power_nb) - return -EEXIST; - - genpd_lock(genpd); - ret = raw_notifier_chain_register(&genpd->power_notifiers, nb); - genpd_unlock(genpd); - - if (ret) { - dev_warn(dev, "failed to add notifier for PM domain %s\n", - genpd->name); - return ret; - } - - gpd_data->power_nb = nb; - return 0; -} -EXPORT_SYMBOL_GPL(dev_pm_genpd_add_notifier); - -/** - * dev_pm_genpd_remove_notifier - Remove a genpd power on/off notifier for @dev - * - * @dev: Device that is associated with the notifier - * - * Users may call this function to remove a genpd power on/off notifier for an - * attached @dev. - * - * It is assumed that the user 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_remove_notifier(struct device *dev) -{ - struct generic_pm_domain *genpd; - struct generic_pm_domain_data *gpd_data; - int ret; - - genpd = dev_to_genpd_safe(dev); - if (!genpd) - return -ENODEV; - - if (WARN_ON(!dev->power.subsys_data || - !dev->power.subsys_data->domain_data)) - return -EINVAL; - - gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); - if (!gpd_data->power_nb) - return -ENODEV; - - genpd_lock(genpd); - ret = raw_notifier_chain_unregister(&genpd->power_notifiers, - gpd_data->power_nb); - genpd_unlock(genpd); - - if (ret) { - dev_warn(dev, "failed to remove notifier for PM domain %s\n", - genpd->name); - return ret; - } - - gpd_data->power_nb = NULL; - return 0; -} -EXPORT_SYMBOL_GPL(dev_pm_genpd_remove_notifier); - -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->parent_links, parent_node) { - if (itr->child == subdomain && itr->parent == genpd) { - ret = -EINVAL; - goto out; - } - } - - link->parent = genpd; - list_add_tail(&link->parent_node, &genpd->parent_links); - link->child = subdomain; - list_add_tail(&link->child_node, &subdomain->child_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: Leader 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: Leader 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->parent_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->parent_links, parent_node) { - if (link->child != subdomain) - continue; - - list_del(&link->parent_node); - list_del(&link->child_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 void genpd_free_default_power_state(struct genpd_power_state *states, - unsigned int state_count) -{ - kfree(states); -} - -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_states = genpd_free_default_power_state; - - return 0; -} - -static int genpd_alloc_data(struct generic_pm_domain *genpd) -{ - struct genpd_governor_data *gd = NULL; - int ret; - - if (genpd_is_cpu_domain(genpd) && - !zalloc_cpumask_var(&genpd->cpus, GFP_KERNEL)) - return -ENOMEM; - - if (genpd->gov) { - gd = kzalloc(sizeof(*gd), GFP_KERNEL); - if (!gd) { - ret = -ENOMEM; - goto free; - } - - gd->max_off_time_ns = -1; - gd->max_off_time_changed = true; - gd->next_wakeup = KTIME_MAX; - gd->next_hrtimer = KTIME_MAX; - } - - /* 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) - goto free; - } - - genpd->gd = gd; - return 0; - -free: - if (genpd_is_cpu_domain(genpd)) - free_cpumask_var(genpd->cpus); - kfree(gd); - return ret; -} - -static void genpd_free_data(struct generic_pm_domain *genpd) -{ - if (genpd_is_cpu_domain(genpd)) - free_cpumask_var(genpd->cpus); - if (genpd->free_states) - genpd->free_states(genpd->states, genpd->state_count); - kfree(genpd->gd); -} - -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->parent_links); - INIT_LIST_HEAD(&genpd->child_links); - INIT_LIST_HEAD(&genpd->dev_list); - RAW_INIT_NOTIFIER_HEAD(&genpd->power_notifiers); - 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 ? GENPD_STATE_OFF : GENPD_STATE_ON; - genpd->device_count = 0; - genpd->provider = NULL; - genpd->has_provider = false; - genpd->accounting_time = ktime_get_mono_fast_ns(); - 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; - genpd->domain.start = genpd_dev_pm_start; - genpd->domain.set_performance_state = genpd_dev_pm_set_performance_state; - - if (genpd->flags & GENPD_FLAG_PM_CLK) { - genpd->dev_ops.stop = pm_clk_suspend; - genpd->dev_ops.start = pm_clk_resume; - } - - /* The always-on governor works better with the corresponding flag. */ - if (gov == &pm_domain_always_on_gov) - genpd->flags |= GENPD_FLAG_RPM_ALWAYS_ON; - - /* Always-on domains must be powered on at initialization. */ - if ((genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd)) && - !genpd_status_on(genpd)) { - pr_err("always-on PM domain %s is not on\n", genpd->name); - return -EINVAL; - } - - /* Multiple states but no governor doesn't make sense. */ - if (!gov && genpd->state_count > 1) - pr_warn("%s: no governor for states\n", genpd->name); - - ret = genpd_alloc_data(genpd); - if (ret) - return ret; - - 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); - genpd_debug_add(genpd); - - 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->parent_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->child_links, child_node) { - list_del(&link->parent_node); - list_del(&link->child_node); - kfree(link); - } - - list_del(&genpd->gpd_list_node); - genpd_unlock(genpd); - genpd_debug_remove(genpd); - cancel_work_sync(&genpd->power_off_work); - genpd_free_data(genpd); - - 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; - fwnode_dev_initialized(&np->fwnode, true); - - 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; -} - -static bool genpd_present(const struct generic_pm_domain *genpd) -{ - bool ret = false; - const struct generic_pm_domain *gpd; - - mutex_lock(&gpd_list_lock); - list_for_each_entry(gpd, &gpd_list, gpd_list_node) { - if (gpd == genpd) { - ret = true; - break; - } - } - mutex_unlock(&gpd_list_lock); - - return ret; -} - -/** - * 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; - - if (!np || !genpd) - return -EINVAL; - - if (!genpd_present(genpd)) - return -EINVAL; - - genpd->dev.of_node = np; - - /* Parse genpd OPP table */ - if (!genpd_is_opp_table_fw(genpd) && genpd->set_performance_state) { - ret = dev_pm_opp_of_add_table(&genpd->dev); - if (ret) - return dev_err_probe(&genpd->dev, ret, "Failed to add OPP table\n"); - - /* - * Save table for faster processing while setting performance - * state. - */ - genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev); - WARN_ON(IS_ERR(genpd->opp_table)); - } - - ret = genpd_add_provider(np, genpd_xlate_simple, genpd); - if (ret) { - if (!genpd_is_opp_table_fw(genpd) && genpd->set_performance_state) { - dev_pm_opp_put_opp_table(genpd->opp_table); - dev_pm_opp_of_remove_table(&genpd->dev); - } - - return ret; - } - - genpd->provider = &np->fwnode; - genpd->has_provider = true; - - return 0; -} -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; - - 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_is_opp_table_fw(genpd) && genpd->set_performance_state) { - ret = dev_pm_opp_of_add_table_indexed(&genpd->dev, i); - if (ret) { - dev_err_probe(&genpd->dev, ret, - "Failed to add OPP table for index %d\n", i); - goto error; - } - - /* - * Save table for faster processing while setting - * performance state. - */ - genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev); - WARN_ON(IS_ERR(genpd->opp_table)); - } - - genpd->provider = &np->fwnode; - genpd->has_provider = true; - } - - ret = genpd_add_provider(np, data->xlate, data); - if (ret < 0) - goto error; - - return 0; - -error: - while (i--) { - genpd = data->domains[i]; - - if (!genpd) - continue; - - genpd->provider = NULL; - genpd->has_provider = false; - - if (!genpd_is_opp_table_fw(genpd) && genpd->set_performance_state) { - dev_pm_opp_put_opp_table(genpd->opp_table); - dev_pm_opp_of_remove_table(&genpd->dev); - } - } - - 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 (genpd_is_opp_table_fw(gpd) || !gpd->set_performance_state) - continue; - - dev_pm_opp_put_opp_table(gpd->opp_table); - dev_pm_opp_of_remove_table(&gpd->dev); - } - } - - fwnode_dev_initialized(&cp->node->fwnode, false); - 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; - - if (!dev) - return -EINVAL; - - 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, dev); - -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 == -ENOENT ? -EPROBE_DEFER : ret; -} -EXPORT_SYMBOL_GPL(of_genpd_add_subdomain); - -/** - * of_genpd_remove_subdomain - Remove a subdomain from 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 removes the subdomain from the parent PM domain. Returns a - * negative error code on failure. - */ -int of_genpd_remove_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 = pm_genpd_remove_subdomain(parent, subdomain); - -out: - mutex_unlock(&gpd_list_lock); - - return ret; -} -EXPORT_SYMBOL_GPL(of_genpd_remove_subdomain); - -/** - * of_genpd_remove_last - Remove the last PM domain registered for a provider - * @np: Pointer to device node 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) -{ - of_node_put(dev->of_node); - 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); - - /* Drop the default performance state */ - if (dev_gpd_data(dev)->default_pstate) { - dev_pm_genpd_set_performance_state(dev, 0); - dev_gpd_data(dev)->default_pstate = 0; - } - - 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 *base_dev, - unsigned int index, bool power_on) -{ - struct of_phandle_args pd_args; - struct generic_pm_domain *pd; - int pstate; - int ret; - - ret = of_parse_phandle_with_args(dev->of_node, "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(base_dev); - } - - dev_dbg(dev, "adding to PM domain %s\n", pd->name); - - ret = genpd_add_device(pd, dev, base_dev); - mutex_unlock(&gpd_list_lock); - - if (ret < 0) - return dev_err_probe(dev, ret, "failed to add to PM domain %s\n", pd->name); - - dev->pm_domain->detach = genpd_dev_pm_detach; - dev->pm_domain->sync = genpd_dev_pm_sync; - - /* Set the default performance state */ - pstate = of_get_required_opp_performance_state(dev->of_node, index); - if (pstate < 0 && pstate != -ENODEV && pstate != -EOPNOTSUPP) { - ret = pstate; - goto err; - } else if (pstate > 0) { - ret = dev_pm_genpd_set_performance_state(dev, pstate); - if (ret) - goto err; - dev_gpd_data(dev)->default_pstate = pstate; - } - - if (power_on) { - genpd_lock(pd); - ret = genpd_power_on(pd, 0); - genpd_unlock(pd); - } - - if (ret) { - /* Drop the default performance state */ - if (dev_gpd_data(dev)->default_pstate) { - dev_pm_genpd_set_performance_state(dev, 0); - dev_gpd_data(dev)->default_pstate = 0; - } - - genpd_remove_device(pd, dev); - return -EPROBE_DEFER; - } - - return 1; - -err: - dev_err(dev, "failed to set required performance state for power-domain %s: %d\n", - pd->name, ret); - genpd_remove_device(pd, dev); - return ret; -} - -/** - * 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, 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; - - /* Verify that the index is within a valid range. */ - num_domains = of_count_phandle_with_args(dev->of_node, "power-domains", - "#power-domain-cells"); - if (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; - virt_dev->of_node = of_node_get(dev->of_node); - - ret = device_register(virt_dev); - if (ret) { - put_device(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, 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 = 1000LL * residency; - - genpd_state->power_on_latency_ns = 1000LL * exit_latency; - genpd_state->power_off_latency_ns = 1000LL * 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 == -ENOENT ? 0 : 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 (!of_device_is_available(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); - -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 -/* - * 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_printf(s, "%-25s ", p); -} - -static void perf_status_str(struct seq_file *s, struct device *dev) -{ - struct generic_pm_domain_data *gpd_data; - - gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); - seq_put_decimal_ull(s, "", gpd_data->performance_state); -} - -static int genpd_summary_one(struct seq_file *s, - struct generic_pm_domain *genpd) -{ - static const char * const status_lookup[] = { - [GENPD_STATE_ON] = "on", - [GENPD_STATE_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 %-50s %u", genpd->name, state, genpd->performance_state); - - /* - * Modifications on the list require holding locks on both - * parent and child, so we are safe. - * Also genpd->name is immutable. - */ - list_for_each_entry(link, &genpd->parent_links, parent_node) { - if (list_is_first(&link->parent_node, &genpd->parent_links)) - seq_printf(s, "\n%48s", " "); - seq_printf(s, "%s", link->child->name); - if (!list_is_last(&link->parent_node, &genpd->parent_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); - perf_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 children performance\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[] = { - [GENPD_STATE_ON] = "on", - [GENPD_STATE_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 == GENPD_STATE_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->parent_links, parent_node) - seq_printf(s, "%s\n", link->child->name); - - genpd_unlock(genpd); - return ret; -} - -static int idle_states_show(struct seq_file *s, void *data) -{ - struct generic_pm_domain *genpd = s->private; - u64 now, delta, idle_time = 0; - unsigned int i; - int ret = 0; - - ret = genpd_lock_interruptible(genpd); - if (ret) - return -ERESTARTSYS; - - seq_puts(s, "State Time Spent(ms) Usage Rejected\n"); - - for (i = 0; i < genpd->state_count; i++) { - idle_time += genpd->states[i].idle_time; - - if (genpd->status == GENPD_STATE_OFF && genpd->state_idx == i) { - now = ktime_get_mono_fast_ns(); - if (now > genpd->accounting_time) { - delta = now - genpd->accounting_time; - idle_time += delta; - } - } - - do_div(idle_time, NSEC_PER_MSEC); - seq_printf(s, "S%-13i %-14llu %-14llu %llu\n", i, idle_time, - genpd->states[i].usage, genpd->states[i].rejected); - } - - genpd_unlock(genpd); - return ret; -} - -static int active_time_show(struct seq_file *s, void *data) -{ - struct generic_pm_domain *genpd = s->private; - u64 now, on_time, delta = 0; - int ret = 0; - - ret = genpd_lock_interruptible(genpd); - if (ret) - return -ERESTARTSYS; - - if (genpd->status == GENPD_STATE_ON) { - now = ktime_get_mono_fast_ns(); - if (now > genpd->accounting_time) - delta = now - genpd->accounting_time; - } - - on_time = genpd->on_time + delta; - do_div(on_time, NSEC_PER_MSEC); - seq_printf(s, "%llu ms\n", on_time); - - genpd_unlock(genpd); - return ret; -} - -static int total_idle_time_show(struct seq_file *s, void *data) -{ - struct generic_pm_domain *genpd = s->private; - u64 now, delta, 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++) { - total += genpd->states[i].idle_time; - - if (genpd->status == GENPD_STATE_OFF && genpd->state_idx == i) { - now = ktime_get_mono_fast_ns(); - if (now > genpd->accounting_time) { - delta = now - genpd->accounting_time; - total += delta; - } - } - } - - do_div(total, NSEC_PER_MSEC); - seq_printf(s, "%llu ms\n", 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 void genpd_debug_add(struct generic_pm_domain *genpd) -{ - struct dentry *d; - - if (!genpd_debugfs_dir) - return; - - 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); -} - -static int __init genpd_debug_init(void) -{ - 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) - genpd_debug_add(genpd); - - 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 */ diff --git a/drivers/base/power/domain_governor.c b/drivers/base/power/domain_governor.c deleted file mode 100644 index d1a10eeebd16..000000000000 --- a/drivers/base/power/domain_governor.c +++ /dev/null @@ -1,418 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * drivers/base/power/domain_governor.c - Governors for device PM domains. - * - * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. - */ -#include <linux/kernel.h> -#include <linux/pm_domain.h> -#include <linux/pm_qos.h> -#include <linux/hrtimer.h> -#include <linux/cpuidle.h> -#include <linux/cpumask.h> -#include <linux/ktime.h> - -static int dev_update_qos_constraint(struct device *dev, void *data) -{ - s64 *constraint_ns_p = data; - s64 constraint_ns; - - if (dev->power.subsys_data && dev->power.subsys_data->domain_data) { - struct gpd_timing_data *td = dev_gpd_data(dev)->td; - - /* - * Only take suspend-time QoS constraints of devices into - * account, because constraints updated after the device has - * been suspended are not guaranteed to be taken into account - * anyway. In order for them to take effect, the device has to - * be resumed and suspended again. - */ - constraint_ns = td ? td->effective_constraint_ns : - PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; - } else { - /* - * The child is not in a domain and there's no info on its - * suspend/resume latencies, so assume them to be negligible and - * take its current PM QoS constraint (that's the only thing - * known at this point anyway). - */ - constraint_ns = dev_pm_qos_read_value(dev, DEV_PM_QOS_RESUME_LATENCY); - constraint_ns *= NSEC_PER_USEC; - } - - if (constraint_ns < *constraint_ns_p) - *constraint_ns_p = constraint_ns; - - return 0; -} - -/** - * default_suspend_ok - Default PM domain governor routine to suspend devices. - * @dev: Device to check. - * - * Returns: true if OK to suspend, false if not OK to suspend - */ -static bool default_suspend_ok(struct device *dev) -{ - struct gpd_timing_data *td = dev_gpd_data(dev)->td; - unsigned long flags; - s64 constraint_ns; - - dev_dbg(dev, "%s()\n", __func__); - - spin_lock_irqsave(&dev->power.lock, flags); - - if (!td->constraint_changed) { - bool ret = td->cached_suspend_ok; - - spin_unlock_irqrestore(&dev->power.lock, flags); - return ret; - } - td->constraint_changed = false; - td->cached_suspend_ok = false; - td->effective_constraint_ns = 0; - constraint_ns = __dev_pm_qos_resume_latency(dev); - - spin_unlock_irqrestore(&dev->power.lock, flags); - - if (constraint_ns == 0) - return false; - - constraint_ns *= NSEC_PER_USEC; - /* - * We can walk the children without any additional locking, because - * they all have been suspended at this point and their - * effective_constraint_ns fields won't be modified in parallel with us. - */ - if (!dev->power.ignore_children) - device_for_each_child(dev, &constraint_ns, - dev_update_qos_constraint); - - if (constraint_ns == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS) { - /* "No restriction", so the device is allowed to suspend. */ - td->effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; - td->cached_suspend_ok = true; - } else if (constraint_ns == 0) { - /* - * This triggers if one of the children that don't belong to a - * domain has a zero PM QoS constraint and it's better not to - * suspend then. effective_constraint_ns is zero already and - * cached_suspend_ok is false, so bail out. - */ - return false; - } else { - constraint_ns -= td->suspend_latency_ns + - td->resume_latency_ns; - /* - * effective_constraint_ns is zero already and cached_suspend_ok - * is false, so if the computed value is not positive, return - * right away. - */ - if (constraint_ns <= 0) - return false; - - td->effective_constraint_ns = constraint_ns; - td->cached_suspend_ok = true; - } - - /* - * The children have been suspended already, so we don't need to take - * their suspend latencies into account here. - */ - return td->cached_suspend_ok; -} - -static void update_domain_next_wakeup(struct generic_pm_domain *genpd, ktime_t now) -{ - ktime_t domain_wakeup = KTIME_MAX; - ktime_t next_wakeup; - struct pm_domain_data *pdd; - struct gpd_link *link; - - if (!(genpd->flags & GENPD_FLAG_MIN_RESIDENCY)) - return; - - /* - * Devices that have a predictable wakeup pattern, may specify - * their next wakeup. Let's find the next wakeup from all the - * devices attached to this domain and from all the sub-domains. - * It is possible that component's a next wakeup may have become - * stale when we read that here. We will ignore to ensure the domain - * is able to enter its optimal idle state. - */ - list_for_each_entry(pdd, &genpd->dev_list, list_node) { - next_wakeup = to_gpd_data(pdd)->td->next_wakeup; - if (next_wakeup != KTIME_MAX && !ktime_before(next_wakeup, now)) - if (ktime_before(next_wakeup, domain_wakeup)) - domain_wakeup = next_wakeup; - } - - list_for_each_entry(link, &genpd->parent_links, parent_node) { - struct genpd_governor_data *cgd = link->child->gd; - - next_wakeup = cgd ? cgd->next_wakeup : KTIME_MAX; - if (next_wakeup != KTIME_MAX && !ktime_before(next_wakeup, now)) - if (ktime_before(next_wakeup, domain_wakeup)) - domain_wakeup = next_wakeup; - } - - genpd->gd->next_wakeup = domain_wakeup; -} - -static bool next_wakeup_allows_state(struct generic_pm_domain *genpd, - unsigned int state, ktime_t now) -{ - ktime_t domain_wakeup = genpd->gd->next_wakeup; - s64 idle_time_ns, min_sleep_ns; - - min_sleep_ns = genpd->states[state].power_off_latency_ns + - genpd->states[state].residency_ns; - - idle_time_ns = ktime_to_ns(ktime_sub(domain_wakeup, now)); - - return idle_time_ns >= min_sleep_ns; -} - -static bool __default_power_down_ok(struct dev_pm_domain *pd, - unsigned int state) -{ - struct generic_pm_domain *genpd = pd_to_genpd(pd); - struct gpd_link *link; - struct pm_domain_data *pdd; - s64 min_off_time_ns; - s64 off_on_time_ns; - - off_on_time_ns = genpd->states[state].power_off_latency_ns + - genpd->states[state].power_on_latency_ns; - - min_off_time_ns = -1; - /* - * Check if subdomains can be off for enough time. - * - * All subdomains have been powered off already at this point. - */ - list_for_each_entry(link, &genpd->parent_links, parent_node) { - struct genpd_governor_data *cgd = link->child->gd; - - s64 sd_max_off_ns = cgd ? cgd->max_off_time_ns : -1; - - if (sd_max_off_ns < 0) - continue; - - /* - * Check if the subdomain is allowed to be off long enough for - * the current domain to turn off and on (that's how much time - * it will have to wait worst case). - */ - if (sd_max_off_ns <= off_on_time_ns) - return false; - - if (min_off_time_ns > sd_max_off_ns || min_off_time_ns < 0) - min_off_time_ns = sd_max_off_ns; - } - - /* - * Check if the devices in the domain can be off enough time. - */ - list_for_each_entry(pdd, &genpd->dev_list, list_node) { - struct gpd_timing_data *td; - s64 constraint_ns; - - /* - * Check if the device is allowed to be off long enough for the - * domain to turn off and on (that's how much time it will - * have to wait worst case). - */ - td = to_gpd_data(pdd)->td; - constraint_ns = td->effective_constraint_ns; - /* - * Zero means "no suspend at all" and this runs only when all - * devices in the domain are suspended, so it must be positive. - */ - if (constraint_ns == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS) - continue; - - if (constraint_ns <= off_on_time_ns) - return false; - - if (min_off_time_ns > constraint_ns || min_off_time_ns < 0) - min_off_time_ns = constraint_ns; - } - - /* - * If the computed minimum device off time is negative, there are no - * latency constraints, so the domain can spend arbitrary time in the - * "off" state. - */ - if (min_off_time_ns < 0) - return true; - - /* - * The difference between the computed minimum subdomain or device off - * time and the time needed to turn the domain on is the maximum - * theoretical time this domain can spend in the "off" state. - */ - genpd->gd->max_off_time_ns = min_off_time_ns - - genpd->states[state].power_on_latency_ns; - return true; -} - -/** - * _default_power_down_ok - Default generic PM domain power off governor routine. - * @pd: PM domain to check. - * @now: current ktime. - * - * This routine must be executed under the PM domain's lock. - * - * Returns: true if OK to power down, false if not OK to power down - */ -static bool _default_power_down_ok(struct dev_pm_domain *pd, ktime_t now) -{ - struct generic_pm_domain *genpd = pd_to_genpd(pd); - struct genpd_governor_data *gd = genpd->gd; - int state_idx = genpd->state_count - 1; - struct gpd_link *link; - - /* - * Find the next wakeup from devices that can determine their own wakeup - * to find when the domain would wakeup and do it for every device down - * the hierarchy. It is not worth while to sleep if the state's residency - * cannot be met. - */ - update_domain_next_wakeup(genpd, now); - if ((genpd->flags & GENPD_FLAG_MIN_RESIDENCY) && (gd->next_wakeup != KTIME_MAX)) { - /* Let's find out the deepest domain idle state, the devices prefer */ - while (state_idx >= 0) { - if (next_wakeup_allows_state(genpd, state_idx, now)) { - gd->max_off_time_changed = true; - break; - } - state_idx--; - } - - if (state_idx < 0) { - state_idx = 0; - gd->cached_power_down_ok = false; - goto done; - } - } - - if (!gd->max_off_time_changed) { - genpd->state_idx = gd->cached_power_down_state_idx; - return gd->cached_power_down_ok; - } - - /* - * We have to invalidate the cached results for the parents, so - * use the observation that default_power_down_ok() is not - * going to be called for any parent until this instance - * returns. - */ - list_for_each_entry(link, &genpd->child_links, child_node) { - struct genpd_governor_data *pgd = link->parent->gd; - - if (pgd) - pgd->max_off_time_changed = true; - } - - gd->max_off_time_ns = -1; - gd->max_off_time_changed = false; - gd->cached_power_down_ok = true; - - /* - * Find a state to power down to, starting from the state - * determined by the next wakeup. - */ - while (!__default_power_down_ok(pd, state_idx)) { - if (state_idx == 0) { - gd->cached_power_down_ok = false; - break; - } - state_idx--; - } - -done: - genpd->state_idx = state_idx; - gd->cached_power_down_state_idx = genpd->state_idx; - return gd->cached_power_down_ok; -} - -static bool default_power_down_ok(struct dev_pm_domain *pd) -{ - return _default_power_down_ok(pd, ktime_get()); -} - -#ifdef CONFIG_CPU_IDLE -static bool cpu_power_down_ok(struct dev_pm_domain *pd) -{ - struct generic_pm_domain *genpd = pd_to_genpd(pd); - struct cpuidle_device *dev; - ktime_t domain_wakeup, next_hrtimer; - ktime_t now = ktime_get(); - s64 idle_duration_ns; - int cpu, i; - - /* Validate dev PM QoS constraints. */ - if (!_default_power_down_ok(pd, now)) - return false; - - if (!(genpd->flags & GENPD_FLAG_CPU_DOMAIN)) - return true; - - /* - * Find the next wakeup for any of the online CPUs within the PM domain - * and its subdomains. Note, we only need the genpd->cpus, as it already - * contains a mask of all CPUs from subdomains. - */ - domain_wakeup = ktime_set(KTIME_SEC_MAX, 0); - for_each_cpu_and(cpu, genpd->cpus, cpu_online_mask) { - dev = per_cpu(cpuidle_devices, cpu); - if (dev) { - next_hrtimer = READ_ONCE(dev->next_hrtimer); - if (ktime_before(next_hrtimer, domain_wakeup)) - domain_wakeup = next_hrtimer; - } - } - - /* The minimum idle duration is from now - until the next wakeup. */ - idle_duration_ns = ktime_to_ns(ktime_sub(domain_wakeup, now)); - if (idle_duration_ns <= 0) - return false; - - /* Store the next domain_wakeup to allow consumers to use it. */ - genpd->gd->next_hrtimer = domain_wakeup; - - /* - * Find the deepest idle state that has its residency value satisfied - * and by also taking into account the power off latency for the state. - * Start at the state picked by the dev PM QoS constraint validation. - */ - i = genpd->state_idx; - do { - if (idle_duration_ns >= (genpd->states[i].residency_ns + - genpd->states[i].power_off_latency_ns)) { - genpd->state_idx = i; - return true; - } - } while (--i >= 0); - - return false; -} - -struct dev_power_governor pm_domain_cpu_gov = { - .suspend_ok = default_suspend_ok, - .power_down_ok = cpu_power_down_ok, -}; -#endif - -struct dev_power_governor simple_qos_governor = { - .suspend_ok = default_suspend_ok, - .power_down_ok = default_power_down_ok, -}; - -/* - * pm_domain_always_on_gov - A governor implementing an always-on policy - */ -struct dev_power_governor pm_domain_always_on_gov = { - .suspend_ok = default_suspend_ok, -}; |