mirror of https://gitee.com/openkylin/linux.git
1816 lines
47 KiB
C
1816 lines
47 KiB
C
/*
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* drivers/base/power/domain.c - Common code related to device power domains.
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*
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* Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
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*
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* This file is released under the GPLv2.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <linux/pm_runtime.h>
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#include <linux/pm_domain.h>
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#include <linux/pm_qos.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/sched.h>
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#include <linux/suspend.h>
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#include <linux/export.h>
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#define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \
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({ \
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type (*__routine)(struct device *__d); \
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type __ret = (type)0; \
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\
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__routine = genpd->dev_ops.callback; \
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if (__routine) { \
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__ret = __routine(dev); \
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} else { \
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__routine = dev_gpd_data(dev)->ops.callback; \
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if (__routine) \
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__ret = __routine(dev); \
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} \
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__ret; \
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})
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#define GENPD_DEV_TIMED_CALLBACK(genpd, type, callback, dev, field, name) \
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({ \
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ktime_t __start = ktime_get(); \
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type __retval = GENPD_DEV_CALLBACK(genpd, type, callback, dev); \
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s64 __elapsed = ktime_to_ns(ktime_sub(ktime_get(), __start)); \
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struct gpd_timing_data *__td = &dev_gpd_data(dev)->td; \
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if (!__retval && __elapsed > __td->field) { \
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__td->field = __elapsed; \
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dev_warn(dev, name " latency exceeded, new value %lld ns\n", \
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__elapsed); \
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genpd->max_off_time_changed = true; \
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__td->constraint_changed = true; \
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} \
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__retval; \
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})
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static LIST_HEAD(gpd_list);
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static DEFINE_MUTEX(gpd_list_lock);
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#ifdef CONFIG_PM
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struct generic_pm_domain *dev_to_genpd(struct device *dev)
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{
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if (IS_ERR_OR_NULL(dev->pm_domain))
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return ERR_PTR(-EINVAL);
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return pd_to_genpd(dev->pm_domain);
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}
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static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev)
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{
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return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev,
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stop_latency_ns, "stop");
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}
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static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev)
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{
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return GENPD_DEV_TIMED_CALLBACK(genpd, int, start, dev,
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start_latency_ns, "start");
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}
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static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev)
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{
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return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev,
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save_state_latency_ns, "state save");
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}
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static int genpd_restore_dev(struct generic_pm_domain *genpd, struct device *dev)
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{
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return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev,
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restore_state_latency_ns,
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"state restore");
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}
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static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd)
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{
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bool ret = false;
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if (!WARN_ON(atomic_read(&genpd->sd_count) == 0))
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ret = !!atomic_dec_and_test(&genpd->sd_count);
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return ret;
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}
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static void genpd_sd_counter_inc(struct generic_pm_domain *genpd)
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{
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atomic_inc(&genpd->sd_count);
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smp_mb__after_atomic_inc();
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}
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static void genpd_acquire_lock(struct generic_pm_domain *genpd)
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{
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DEFINE_WAIT(wait);
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mutex_lock(&genpd->lock);
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/*
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* Wait for the domain to transition into either the active,
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* or the power off state.
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*/
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for (;;) {
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prepare_to_wait(&genpd->status_wait_queue, &wait,
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TASK_UNINTERRUPTIBLE);
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if (genpd->status == GPD_STATE_ACTIVE
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|| genpd->status == GPD_STATE_POWER_OFF)
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break;
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mutex_unlock(&genpd->lock);
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schedule();
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mutex_lock(&genpd->lock);
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}
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finish_wait(&genpd->status_wait_queue, &wait);
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}
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static void genpd_release_lock(struct generic_pm_domain *genpd)
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{
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mutex_unlock(&genpd->lock);
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}
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static void genpd_set_active(struct generic_pm_domain *genpd)
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{
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if (genpd->resume_count == 0)
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genpd->status = GPD_STATE_ACTIVE;
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}
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/**
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* __pm_genpd_poweron - Restore power to a given PM domain and its masters.
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* @genpd: PM domain to power up.
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*
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* Restore power to @genpd and all of its masters so that it is possible to
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* resume a device belonging to it.
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*/
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int __pm_genpd_poweron(struct generic_pm_domain *genpd)
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__releases(&genpd->lock) __acquires(&genpd->lock)
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{
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struct gpd_link *link;
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DEFINE_WAIT(wait);
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int ret = 0;
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/* If the domain's master is being waited for, we have to wait too. */
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for (;;) {
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prepare_to_wait(&genpd->status_wait_queue, &wait,
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TASK_UNINTERRUPTIBLE);
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if (genpd->status != GPD_STATE_WAIT_MASTER)
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break;
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mutex_unlock(&genpd->lock);
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schedule();
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mutex_lock(&genpd->lock);
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}
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finish_wait(&genpd->status_wait_queue, &wait);
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if (genpd->status == GPD_STATE_ACTIVE
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|| (genpd->prepared_count > 0 && genpd->suspend_power_off))
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return 0;
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if (genpd->status != GPD_STATE_POWER_OFF) {
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genpd_set_active(genpd);
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return 0;
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}
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/*
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* The list is guaranteed not to change while the loop below is being
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* executed, unless one of the masters' .power_on() callbacks fiddles
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* with it.
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*/
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list_for_each_entry(link, &genpd->slave_links, slave_node) {
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genpd_sd_counter_inc(link->master);
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genpd->status = GPD_STATE_WAIT_MASTER;
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mutex_unlock(&genpd->lock);
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ret = pm_genpd_poweron(link->master);
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mutex_lock(&genpd->lock);
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/*
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* The "wait for parent" status is guaranteed not to change
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* while the master is powering on.
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*/
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genpd->status = GPD_STATE_POWER_OFF;
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wake_up_all(&genpd->status_wait_queue);
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if (ret) {
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genpd_sd_counter_dec(link->master);
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goto err;
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}
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}
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if (genpd->power_on) {
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ktime_t time_start = ktime_get();
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s64 elapsed_ns;
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ret = genpd->power_on(genpd);
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if (ret)
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goto err;
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elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
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if (elapsed_ns > genpd->power_on_latency_ns) {
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genpd->power_on_latency_ns = elapsed_ns;
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genpd->max_off_time_changed = true;
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if (genpd->name)
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pr_warning("%s: Power-on latency exceeded, "
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"new value %lld ns\n", genpd->name,
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elapsed_ns);
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}
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}
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genpd_set_active(genpd);
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return 0;
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err:
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list_for_each_entry_continue_reverse(link, &genpd->slave_links, slave_node)
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genpd_sd_counter_dec(link->master);
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return ret;
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}
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/**
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* pm_genpd_poweron - Restore power to a given PM domain and its masters.
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* @genpd: PM domain to power up.
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*/
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int pm_genpd_poweron(struct generic_pm_domain *genpd)
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{
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int ret;
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mutex_lock(&genpd->lock);
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ret = __pm_genpd_poweron(genpd);
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mutex_unlock(&genpd->lock);
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return ret;
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}
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#endif /* CONFIG_PM */
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#ifdef CONFIG_PM_RUNTIME
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static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
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unsigned long val, void *ptr)
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{
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struct generic_pm_domain_data *gpd_data;
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struct device *dev;
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gpd_data = container_of(nb, struct generic_pm_domain_data, nb);
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mutex_lock(&gpd_data->lock);
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dev = gpd_data->base.dev;
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if (!dev) {
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mutex_unlock(&gpd_data->lock);
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return NOTIFY_DONE;
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}
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mutex_unlock(&gpd_data->lock);
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for (;;) {
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struct generic_pm_domain *genpd;
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struct pm_domain_data *pdd;
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spin_lock_irq(&dev->power.lock);
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pdd = dev->power.subsys_data ?
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dev->power.subsys_data->domain_data : NULL;
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if (pdd) {
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to_gpd_data(pdd)->td.constraint_changed = true;
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genpd = dev_to_genpd(dev);
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} else {
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genpd = ERR_PTR(-ENODATA);
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}
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spin_unlock_irq(&dev->power.lock);
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if (!IS_ERR(genpd)) {
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mutex_lock(&genpd->lock);
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genpd->max_off_time_changed = true;
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mutex_unlock(&genpd->lock);
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}
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dev = dev->parent;
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if (!dev || dev->power.ignore_children)
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break;
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}
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return NOTIFY_DONE;
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}
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/**
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* __pm_genpd_save_device - Save the pre-suspend state of a device.
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* @pdd: Domain data of the device to save the state of.
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* @genpd: PM domain the device belongs to.
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*/
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static int __pm_genpd_save_device(struct pm_domain_data *pdd,
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struct generic_pm_domain *genpd)
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__releases(&genpd->lock) __acquires(&genpd->lock)
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{
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struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd);
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struct device *dev = pdd->dev;
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int ret = 0;
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if (gpd_data->need_restore)
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return 0;
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mutex_unlock(&genpd->lock);
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genpd_start_dev(genpd, dev);
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ret = genpd_save_dev(genpd, dev);
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genpd_stop_dev(genpd, dev);
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mutex_lock(&genpd->lock);
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if (!ret)
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gpd_data->need_restore = true;
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return ret;
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}
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/**
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* __pm_genpd_restore_device - Restore the pre-suspend state of a device.
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* @pdd: Domain data of the device to restore the state of.
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* @genpd: PM domain the device belongs to.
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*/
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static void __pm_genpd_restore_device(struct pm_domain_data *pdd,
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struct generic_pm_domain *genpd)
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__releases(&genpd->lock) __acquires(&genpd->lock)
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{
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struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd);
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struct device *dev = pdd->dev;
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if (!gpd_data->need_restore)
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return;
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mutex_unlock(&genpd->lock);
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genpd_start_dev(genpd, dev);
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genpd_restore_dev(genpd, dev);
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genpd_stop_dev(genpd, dev);
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mutex_lock(&genpd->lock);
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gpd_data->need_restore = false;
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}
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/**
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* genpd_abort_poweroff - Check if a PM domain power off should be aborted.
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* @genpd: PM domain to check.
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*
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* Return true if a PM domain's status changed to GPD_STATE_ACTIVE during
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* a "power off" operation, which means that a "power on" has occured in the
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* meantime, or if its resume_count field is different from zero, which means
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* that one of its devices has been resumed in the meantime.
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*/
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static bool genpd_abort_poweroff(struct generic_pm_domain *genpd)
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{
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return genpd->status == GPD_STATE_WAIT_MASTER
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|| genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0;
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}
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/**
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* genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff().
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* @genpd: PM domait to power off.
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*
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* Queue up the execution of pm_genpd_poweroff() unless it's already been done
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* before.
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*/
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void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
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{
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if (!work_pending(&genpd->power_off_work))
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queue_work(pm_wq, &genpd->power_off_work);
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}
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/**
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* pm_genpd_poweroff - Remove power from a given PM domain.
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* @genpd: PM domain to power down.
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*
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* If all of the @genpd's devices have been suspended and all of its subdomains
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* have been powered down, run the runtime suspend callbacks provided by all of
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* the @genpd's devices' drivers and remove power from @genpd.
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*/
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static int pm_genpd_poweroff(struct generic_pm_domain *genpd)
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__releases(&genpd->lock) __acquires(&genpd->lock)
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{
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struct pm_domain_data *pdd;
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struct gpd_link *link;
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unsigned int not_suspended;
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int ret = 0;
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start:
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/*
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* Do not try to power off the domain in the following situations:
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* (1) The domain is already in the "power off" state.
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* (2) The domain is waiting for its master to power up.
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* (3) One of the domain's devices is being resumed right now.
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* (4) System suspend is in progress.
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*/
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if (genpd->status == GPD_STATE_POWER_OFF
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|| genpd->status == GPD_STATE_WAIT_MASTER
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|| genpd->resume_count > 0 || genpd->prepared_count > 0)
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return 0;
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if (atomic_read(&genpd->sd_count) > 0)
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return -EBUSY;
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not_suspended = 0;
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list_for_each_entry(pdd, &genpd->dev_list, list_node)
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if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev)
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|| pdd->dev->power.irq_safe || to_gpd_data(pdd)->always_on))
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not_suspended++;
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if (not_suspended > genpd->in_progress)
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return -EBUSY;
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if (genpd->poweroff_task) {
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/*
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* Another instance of pm_genpd_poweroff() is executing
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* callbacks, so tell it to start over and return.
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*/
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genpd->status = GPD_STATE_REPEAT;
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return 0;
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}
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if (genpd->gov && genpd->gov->power_down_ok) {
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if (!genpd->gov->power_down_ok(&genpd->domain))
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return -EAGAIN;
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}
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genpd->status = GPD_STATE_BUSY;
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genpd->poweroff_task = current;
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list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) {
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ret = atomic_read(&genpd->sd_count) == 0 ?
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__pm_genpd_save_device(pdd, genpd) : -EBUSY;
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if (genpd_abort_poweroff(genpd))
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goto out;
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if (ret) {
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genpd_set_active(genpd);
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goto out;
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}
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if (genpd->status == GPD_STATE_REPEAT) {
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genpd->poweroff_task = NULL;
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goto start;
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}
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}
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if (genpd->power_off) {
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ktime_t time_start;
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s64 elapsed_ns;
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if (atomic_read(&genpd->sd_count) > 0) {
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ret = -EBUSY;
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goto out;
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}
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time_start = ktime_get();
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/*
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* If sd_count > 0 at this point, one of the subdomains hasn't
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* managed to call pm_genpd_poweron() for the master yet after
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* incrementing it. In that case pm_genpd_poweron() will wait
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* for us to drop the lock, so we can call .power_off() and let
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* the pm_genpd_poweron() restore power for us (this shouldn't
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* happen very often).
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*/
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ret = genpd->power_off(genpd);
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if (ret == -EBUSY) {
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genpd_set_active(genpd);
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goto out;
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}
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elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
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if (elapsed_ns > genpd->power_off_latency_ns) {
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genpd->power_off_latency_ns = elapsed_ns;
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genpd->max_off_time_changed = true;
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if (genpd->name)
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pr_warning("%s: Power-off latency exceeded, "
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"new value %lld ns\n", genpd->name,
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elapsed_ns);
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}
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}
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genpd->status = GPD_STATE_POWER_OFF;
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list_for_each_entry(link, &genpd->slave_links, slave_node) {
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genpd_sd_counter_dec(link->master);
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genpd_queue_power_off_work(link->master);
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}
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out:
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genpd->poweroff_task = NULL;
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wake_up_all(&genpd->status_wait_queue);
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return ret;
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}
|
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|
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/**
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* genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0.
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* @work: Work structure used for scheduling the execution of this function.
|
|
*/
|
|
static void genpd_power_off_work_fn(struct work_struct *work)
|
|
{
|
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struct generic_pm_domain *genpd;
|
|
|
|
genpd = container_of(work, struct generic_pm_domain, power_off_work);
|
|
|
|
genpd_acquire_lock(genpd);
|
|
pm_genpd_poweroff(genpd);
|
|
genpd_release_lock(genpd);
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain.
|
|
* @dev: Device to suspend.
|
|
*
|
|
* Carry out a runtime suspend of a device under the assumption that its
|
|
* pm_domain field points to the domain member of an object of type
|
|
* struct generic_pm_domain representing a PM domain consisting of I/O devices.
|
|
*/
|
|
static int pm_genpd_runtime_suspend(struct device *dev)
|
|
{
|
|
struct generic_pm_domain *genpd;
|
|
bool (*stop_ok)(struct device *__dev);
|
|
int ret;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
genpd = dev_to_genpd(dev);
|
|
if (IS_ERR(genpd))
|
|
return -EINVAL;
|
|
|
|
might_sleep_if(!genpd->dev_irq_safe);
|
|
|
|
if (dev_gpd_data(dev)->always_on)
|
|
return -EBUSY;
|
|
|
|
stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL;
|
|
if (stop_ok && !stop_ok(dev))
|
|
return -EBUSY;
|
|
|
|
ret = genpd_stop_dev(genpd, dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* If power.irq_safe is set, this routine will be run with interrupts
|
|
* off, so it can't use mutexes.
|
|
*/
|
|
if (dev->power.irq_safe)
|
|
return 0;
|
|
|
|
mutex_lock(&genpd->lock);
|
|
genpd->in_progress++;
|
|
pm_genpd_poweroff(genpd);
|
|
genpd->in_progress--;
|
|
mutex_unlock(&genpd->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain.
|
|
* @dev: Device to resume.
|
|
*
|
|
* Carry out a runtime resume of a device under the assumption that its
|
|
* pm_domain field points to the domain member of an object of type
|
|
* struct generic_pm_domain representing a PM domain consisting of I/O devices.
|
|
*/
|
|
static int pm_genpd_runtime_resume(struct device *dev)
|
|
{
|
|
struct generic_pm_domain *genpd;
|
|
DEFINE_WAIT(wait);
|
|
int ret;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
genpd = dev_to_genpd(dev);
|
|
if (IS_ERR(genpd))
|
|
return -EINVAL;
|
|
|
|
might_sleep_if(!genpd->dev_irq_safe);
|
|
|
|
/* If power.irq_safe, the PM domain is never powered off. */
|
|
if (dev->power.irq_safe)
|
|
goto out;
|
|
|
|
mutex_lock(&genpd->lock);
|
|
ret = __pm_genpd_poweron(genpd);
|
|
if (ret) {
|
|
mutex_unlock(&genpd->lock);
|
|
return ret;
|
|
}
|
|
genpd->status = GPD_STATE_BUSY;
|
|
genpd->resume_count++;
|
|
for (;;) {
|
|
prepare_to_wait(&genpd->status_wait_queue, &wait,
|
|
TASK_UNINTERRUPTIBLE);
|
|
/*
|
|
* If current is the powering off task, we have been called
|
|
* reentrantly from one of the device callbacks, so we should
|
|
* not wait.
|
|
*/
|
|
if (!genpd->poweroff_task || genpd->poweroff_task == current)
|
|
break;
|
|
mutex_unlock(&genpd->lock);
|
|
|
|
schedule();
|
|
|
|
mutex_lock(&genpd->lock);
|
|
}
|
|
finish_wait(&genpd->status_wait_queue, &wait);
|
|
__pm_genpd_restore_device(dev->power.subsys_data->domain_data, genpd);
|
|
genpd->resume_count--;
|
|
genpd_set_active(genpd);
|
|
wake_up_all(&genpd->status_wait_queue);
|
|
mutex_unlock(&genpd->lock);
|
|
|
|
out:
|
|
genpd_start_dev(genpd, dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_poweroff_unused - Power off all PM domains with no devices in use.
|
|
*/
|
|
void pm_genpd_poweroff_unused(void)
|
|
{
|
|
struct generic_pm_domain *genpd;
|
|
|
|
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);
|
|
}
|
|
|
|
#else
|
|
|
|
static inline int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
|
|
unsigned long val, void *ptr)
|
|
{
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static inline void genpd_power_off_work_fn(struct work_struct *work) {}
|
|
|
|
#define pm_genpd_runtime_suspend NULL
|
|
#define pm_genpd_runtime_resume NULL
|
|
|
|
#endif /* CONFIG_PM_RUNTIME */
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
|
|
static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd,
|
|
struct device *dev)
|
|
{
|
|
return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev);
|
|
}
|
|
|
|
static int genpd_suspend_dev(struct generic_pm_domain *genpd, struct device *dev)
|
|
{
|
|
return GENPD_DEV_CALLBACK(genpd, int, suspend, dev);
|
|
}
|
|
|
|
static int genpd_suspend_late(struct generic_pm_domain *genpd, struct device *dev)
|
|
{
|
|
return GENPD_DEV_CALLBACK(genpd, int, suspend_late, dev);
|
|
}
|
|
|
|
static int genpd_resume_early(struct generic_pm_domain *genpd, struct device *dev)
|
|
{
|
|
return GENPD_DEV_CALLBACK(genpd, int, resume_early, dev);
|
|
}
|
|
|
|
static int genpd_resume_dev(struct generic_pm_domain *genpd, struct device *dev)
|
|
{
|
|
return GENPD_DEV_CALLBACK(genpd, int, resume, dev);
|
|
}
|
|
|
|
static int genpd_freeze_dev(struct generic_pm_domain *genpd, struct device *dev)
|
|
{
|
|
return GENPD_DEV_CALLBACK(genpd, int, freeze, dev);
|
|
}
|
|
|
|
static int genpd_freeze_late(struct generic_pm_domain *genpd, struct device *dev)
|
|
{
|
|
return GENPD_DEV_CALLBACK(genpd, int, freeze_late, dev);
|
|
}
|
|
|
|
static int genpd_thaw_early(struct generic_pm_domain *genpd, struct device *dev)
|
|
{
|
|
return GENPD_DEV_CALLBACK(genpd, int, thaw_early, dev);
|
|
}
|
|
|
|
static int genpd_thaw_dev(struct generic_pm_domain *genpd, struct device *dev)
|
|
{
|
|
return GENPD_DEV_CALLBACK(genpd, int, thaw, dev);
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters.
|
|
* @genpd: PM domain to power off, if possible.
|
|
*
|
|
* Check if the given PM domain can be powered off (during system suspend or
|
|
* hibernation) and do that if so. Also, in that case propagate to its masters.
|
|
*
|
|
* This function is only called in "noirq" stages of system power transitions,
|
|
* so it need not acquire locks (all of the "noirq" callbacks are executed
|
|
* sequentially, so it is guaranteed that it will never run twice in parallel).
|
|
*/
|
|
static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd)
|
|
{
|
|
struct gpd_link *link;
|
|
|
|
if (genpd->status == GPD_STATE_POWER_OFF)
|
|
return;
|
|
|
|
if (genpd->suspended_count != genpd->device_count
|
|
|| atomic_read(&genpd->sd_count) > 0)
|
|
return;
|
|
|
|
if (genpd->power_off)
|
|
genpd->power_off(genpd);
|
|
|
|
genpd->status = GPD_STATE_POWER_OFF;
|
|
|
|
list_for_each_entry(link, &genpd->slave_links, slave_node) {
|
|
genpd_sd_counter_dec(link->master);
|
|
pm_genpd_sync_poweroff(link->master);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* resume_needed - Check whether to resume a device before system suspend.
|
|
* @dev: Device to check.
|
|
* @genpd: PM domain the device belongs to.
|
|
*
|
|
* There are two cases in which a device that can wake up the system from sleep
|
|
* states should be resumed by pm_genpd_prepare(): (1) if the device is enabled
|
|
* to wake up the system and it has to remain active for this purpose while the
|
|
* system is in the sleep state and (2) if the device is not enabled to wake up
|
|
* the system from sleep states and it generally doesn't generate wakeup signals
|
|
* by itself (those signals are generated on its behalf by other parts of the
|
|
* system). In the latter case it may be necessary to reconfigure the device's
|
|
* wakeup settings during system suspend, because it may have been set up to
|
|
* signal remote wakeup from the system's working state as needed by runtime PM.
|
|
* Return 'true' in either of the above cases.
|
|
*/
|
|
static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd)
|
|
{
|
|
bool active_wakeup;
|
|
|
|
if (!device_can_wakeup(dev))
|
|
return false;
|
|
|
|
active_wakeup = genpd_dev_active_wakeup(genpd, dev);
|
|
return device_may_wakeup(dev) ? active_wakeup : !active_wakeup;
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_prepare - Start power transition of a device in a PM domain.
|
|
* @dev: Device to start the transition of.
|
|
*
|
|
* Start a power transition of a device (during a system-wide power transition)
|
|
* under the assumption that its pm_domain field points to the domain member of
|
|
* an object of type struct generic_pm_domain representing a PM domain
|
|
* consisting of I/O devices.
|
|
*/
|
|
static int pm_genpd_prepare(struct device *dev)
|
|
{
|
|
struct generic_pm_domain *genpd;
|
|
int ret;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
genpd = dev_to_genpd(dev);
|
|
if (IS_ERR(genpd))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* If a wakeup request is pending for the device, it should be woken up
|
|
* at this point and a system wakeup event should be reported if it's
|
|
* set up to wake up the system from sleep states.
|
|
*/
|
|
pm_runtime_get_noresume(dev);
|
|
if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
|
|
pm_wakeup_event(dev, 0);
|
|
|
|
if (pm_wakeup_pending()) {
|
|
pm_runtime_put_sync(dev);
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (resume_needed(dev, genpd))
|
|
pm_runtime_resume(dev);
|
|
|
|
genpd_acquire_lock(genpd);
|
|
|
|
if (genpd->prepared_count++ == 0) {
|
|
genpd->suspended_count = 0;
|
|
genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF;
|
|
}
|
|
|
|
genpd_release_lock(genpd);
|
|
|
|
if (genpd->suspend_power_off) {
|
|
pm_runtime_put_noidle(dev);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The PM domain must be in the GPD_STATE_ACTIVE state at this point,
|
|
* so pm_genpd_poweron() will return immediately, but if the device
|
|
* is suspended (e.g. it's been stopped by genpd_stop_dev()), we need
|
|
* to make it operational.
|
|
*/
|
|
pm_runtime_resume(dev);
|
|
__pm_runtime_disable(dev, false);
|
|
|
|
ret = pm_generic_prepare(dev);
|
|
if (ret) {
|
|
mutex_lock(&genpd->lock);
|
|
|
|
if (--genpd->prepared_count == 0)
|
|
genpd->suspend_power_off = false;
|
|
|
|
mutex_unlock(&genpd->lock);
|
|
pm_runtime_enable(dev);
|
|
}
|
|
|
|
pm_runtime_put_sync(dev);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_suspend - Suspend a device belonging to an I/O PM domain.
|
|
* @dev: Device to suspend.
|
|
*
|
|
* Suspend a device under the assumption that its pm_domain field points to the
|
|
* domain member of an object of type struct generic_pm_domain representing
|
|
* a PM domain consisting of I/O devices.
|
|
*/
|
|
static int pm_genpd_suspend(struct device *dev)
|
|
{
|
|
struct generic_pm_domain *genpd;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
genpd = dev_to_genpd(dev);
|
|
if (IS_ERR(genpd))
|
|
return -EINVAL;
|
|
|
|
return genpd->suspend_power_off ? 0 : genpd_suspend_dev(genpd, dev);
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain.
|
|
* @dev: Device to suspend.
|
|
*
|
|
* Carry out a late suspend of a device under the assumption that its
|
|
* pm_domain field points to the domain member of an object of type
|
|
* struct generic_pm_domain representing a PM domain consisting of I/O devices.
|
|
*/
|
|
static int pm_genpd_suspend_late(struct device *dev)
|
|
{
|
|
struct generic_pm_domain *genpd;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
genpd = dev_to_genpd(dev);
|
|
if (IS_ERR(genpd))
|
|
return -EINVAL;
|
|
|
|
return genpd->suspend_power_off ? 0 : genpd_suspend_late(genpd, dev);
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain.
|
|
* @dev: Device to suspend.
|
|
*
|
|
* Stop the device and remove power from the domain if all devices in it have
|
|
* been stopped.
|
|
*/
|
|
static int pm_genpd_suspend_noirq(struct device *dev)
|
|
{
|
|
struct generic_pm_domain *genpd;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
genpd = dev_to_genpd(dev);
|
|
if (IS_ERR(genpd))
|
|
return -EINVAL;
|
|
|
|
if (genpd->suspend_power_off || dev_gpd_data(dev)->always_on
|
|
|| (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)))
|
|
return 0;
|
|
|
|
genpd_stop_dev(genpd, dev);
|
|
|
|
/*
|
|
* Since all of the "noirq" callbacks are executed sequentially, it is
|
|
* guaranteed that this function will never run twice in parallel for
|
|
* the same PM domain, so it is not necessary to use locking here.
|
|
*/
|
|
genpd->suspended_count++;
|
|
pm_genpd_sync_poweroff(genpd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain.
|
|
* @dev: Device to resume.
|
|
*
|
|
* Restore power to the device's PM domain, if necessary, and start the device.
|
|
*/
|
|
static int pm_genpd_resume_noirq(struct device *dev)
|
|
{
|
|
struct generic_pm_domain *genpd;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
genpd = dev_to_genpd(dev);
|
|
if (IS_ERR(genpd))
|
|
return -EINVAL;
|
|
|
|
if (genpd->suspend_power_off || dev_gpd_data(dev)->always_on
|
|
|| (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)))
|
|
return 0;
|
|
|
|
/*
|
|
* Since all of the "noirq" callbacks are executed sequentially, it is
|
|
* guaranteed that this function will never run twice in parallel for
|
|
* the same PM domain, so it is not necessary to use locking here.
|
|
*/
|
|
pm_genpd_poweron(genpd);
|
|
genpd->suspended_count--;
|
|
|
|
return genpd_start_dev(genpd, dev);
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_resume_early - Early resume of a device in an I/O PM domain.
|
|
* @dev: Device to resume.
|
|
*
|
|
* Carry out an early resume of a device under the assumption that its
|
|
* pm_domain field points to the domain member of an object of type
|
|
* struct generic_pm_domain representing a power domain consisting of I/O
|
|
* devices.
|
|
*/
|
|
static int pm_genpd_resume_early(struct device *dev)
|
|
{
|
|
struct generic_pm_domain *genpd;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
genpd = dev_to_genpd(dev);
|
|
if (IS_ERR(genpd))
|
|
return -EINVAL;
|
|
|
|
return genpd->suspend_power_off ? 0 : genpd_resume_early(genpd, dev);
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_resume - Resume of device in an I/O PM domain.
|
|
* @dev: Device to resume.
|
|
*
|
|
* Resume a device under the assumption that its pm_domain field points to the
|
|
* domain member of an object of type struct generic_pm_domain representing
|
|
* a power domain consisting of I/O devices.
|
|
*/
|
|
static int pm_genpd_resume(struct device *dev)
|
|
{
|
|
struct generic_pm_domain *genpd;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
genpd = dev_to_genpd(dev);
|
|
if (IS_ERR(genpd))
|
|
return -EINVAL;
|
|
|
|
return genpd->suspend_power_off ? 0 : genpd_resume_dev(genpd, dev);
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_freeze - Freezing a device in an I/O PM domain.
|
|
* @dev: Device to freeze.
|
|
*
|
|
* Freeze a device under the assumption that its pm_domain field points to the
|
|
* domain member of an object of type struct generic_pm_domain representing
|
|
* a power domain consisting of I/O devices.
|
|
*/
|
|
static int pm_genpd_freeze(struct device *dev)
|
|
{
|
|
struct generic_pm_domain *genpd;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
genpd = dev_to_genpd(dev);
|
|
if (IS_ERR(genpd))
|
|
return -EINVAL;
|
|
|
|
return genpd->suspend_power_off ? 0 : genpd_freeze_dev(genpd, dev);
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain.
|
|
* @dev: Device to freeze.
|
|
*
|
|
* Carry out a late freeze of a device under the assumption that its
|
|
* pm_domain field points to the domain member of an object of type
|
|
* struct generic_pm_domain representing a power domain consisting of I/O
|
|
* devices.
|
|
*/
|
|
static int pm_genpd_freeze_late(struct device *dev)
|
|
{
|
|
struct generic_pm_domain *genpd;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
genpd = dev_to_genpd(dev);
|
|
if (IS_ERR(genpd))
|
|
return -EINVAL;
|
|
|
|
return genpd->suspend_power_off ? 0 : genpd_freeze_late(genpd, dev);
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain.
|
|
* @dev: Device to freeze.
|
|
*
|
|
* Carry out a late freeze of a device under the assumption that its
|
|
* pm_domain field points to the domain member of an object of type
|
|
* struct generic_pm_domain representing a power domain consisting of I/O
|
|
* devices.
|
|
*/
|
|
static int pm_genpd_freeze_noirq(struct device *dev)
|
|
{
|
|
struct generic_pm_domain *genpd;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
genpd = dev_to_genpd(dev);
|
|
if (IS_ERR(genpd))
|
|
return -EINVAL;
|
|
|
|
return genpd->suspend_power_off || dev_gpd_data(dev)->always_on ?
|
|
0 : genpd_stop_dev(genpd, dev);
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain.
|
|
* @dev: Device to thaw.
|
|
*
|
|
* Start the device, unless power has been removed from the domain already
|
|
* before the system transition.
|
|
*/
|
|
static int pm_genpd_thaw_noirq(struct device *dev)
|
|
{
|
|
struct generic_pm_domain *genpd;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
genpd = dev_to_genpd(dev);
|
|
if (IS_ERR(genpd))
|
|
return -EINVAL;
|
|
|
|
return genpd->suspend_power_off || dev_gpd_data(dev)->always_on ?
|
|
0 : genpd_start_dev(genpd, dev);
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_thaw_early - Early thaw of device in an I/O PM domain.
|
|
* @dev: Device to thaw.
|
|
*
|
|
* Carry out an early thaw of a device under the assumption that its
|
|
* pm_domain field points to the domain member of an object of type
|
|
* struct generic_pm_domain representing a power domain consisting of I/O
|
|
* devices.
|
|
*/
|
|
static int pm_genpd_thaw_early(struct device *dev)
|
|
{
|
|
struct generic_pm_domain *genpd;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
genpd = dev_to_genpd(dev);
|
|
if (IS_ERR(genpd))
|
|
return -EINVAL;
|
|
|
|
return genpd->suspend_power_off ? 0 : genpd_thaw_early(genpd, dev);
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_thaw - Thaw a device belonging to an I/O power domain.
|
|
* @dev: Device to thaw.
|
|
*
|
|
* Thaw a device under the assumption that its pm_domain field points to the
|
|
* domain member of an object of type struct generic_pm_domain representing
|
|
* a power domain consisting of I/O devices.
|
|
*/
|
|
static int pm_genpd_thaw(struct device *dev)
|
|
{
|
|
struct generic_pm_domain *genpd;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
genpd = dev_to_genpd(dev);
|
|
if (IS_ERR(genpd))
|
|
return -EINVAL;
|
|
|
|
return genpd->suspend_power_off ? 0 : genpd_thaw_dev(genpd, dev);
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain.
|
|
* @dev: Device to resume.
|
|
*
|
|
* Make sure the domain will be in the same power state as before the
|
|
* hibernation the system is resuming from and start the device if necessary.
|
|
*/
|
|
static int pm_genpd_restore_noirq(struct device *dev)
|
|
{
|
|
struct generic_pm_domain *genpd;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
genpd = dev_to_genpd(dev);
|
|
if (IS_ERR(genpd))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Since all of the "noirq" callbacks are executed sequentially, it is
|
|
* guaranteed that this function will never run twice in parallel for
|
|
* the same PM domain, so it is not necessary to use locking here.
|
|
*
|
|
* At this point suspended_count == 0 means we are being run for the
|
|
* first time for the given domain in the present cycle.
|
|
*/
|
|
if (genpd->suspended_count++ == 0) {
|
|
/*
|
|
* The boot kernel might put the domain into arbitrary state,
|
|
* so make it appear as powered off to pm_genpd_poweron(), so
|
|
* that it tries to power it on in case it was really off.
|
|
*/
|
|
genpd->status = GPD_STATE_POWER_OFF;
|
|
if (genpd->suspend_power_off) {
|
|
/*
|
|
* If the domain was off before the hibernation, make
|
|
* sure it will be off going forward.
|
|
*/
|
|
if (genpd->power_off)
|
|
genpd->power_off(genpd);
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (genpd->suspend_power_off)
|
|
return 0;
|
|
|
|
pm_genpd_poweron(genpd);
|
|
|
|
return dev_gpd_data(dev)->always_on ? 0 : genpd_start_dev(genpd, dev);
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_complete - Complete power transition of a device in a power domain.
|
|
* @dev: Device to complete the transition of.
|
|
*
|
|
* Complete a power transition of a device (during a system-wide power
|
|
* transition) under the assumption that its pm_domain field points to the
|
|
* domain member of an object of type struct generic_pm_domain representing
|
|
* a power domain consisting of I/O devices.
|
|
*/
|
|
static void pm_genpd_complete(struct device *dev)
|
|
{
|
|
struct generic_pm_domain *genpd;
|
|
bool run_complete;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
genpd = dev_to_genpd(dev);
|
|
if (IS_ERR(genpd))
|
|
return;
|
|
|
|
mutex_lock(&genpd->lock);
|
|
|
|
run_complete = !genpd->suspend_power_off;
|
|
if (--genpd->prepared_count == 0)
|
|
genpd->suspend_power_off = false;
|
|
|
|
mutex_unlock(&genpd->lock);
|
|
|
|
if (run_complete) {
|
|
pm_generic_complete(dev);
|
|
pm_runtime_set_active(dev);
|
|
pm_runtime_enable(dev);
|
|
pm_runtime_idle(dev);
|
|
}
|
|
}
|
|
|
|
#else
|
|
|
|
#define pm_genpd_prepare NULL
|
|
#define pm_genpd_suspend NULL
|
|
#define pm_genpd_suspend_late NULL
|
|
#define pm_genpd_suspend_noirq NULL
|
|
#define pm_genpd_resume_early NULL
|
|
#define pm_genpd_resume_noirq NULL
|
|
#define pm_genpd_resume NULL
|
|
#define pm_genpd_freeze NULL
|
|
#define pm_genpd_freeze_late NULL
|
|
#define pm_genpd_freeze_noirq NULL
|
|
#define pm_genpd_thaw_early NULL
|
|
#define pm_genpd_thaw_noirq NULL
|
|
#define pm_genpd_thaw NULL
|
|
#define pm_genpd_restore_noirq NULL
|
|
#define pm_genpd_complete NULL
|
|
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
/**
|
|
* __pm_genpd_add_device - Add a device to an I/O PM domain.
|
|
* @genpd: PM domain to add the device to.
|
|
* @dev: Device to be added.
|
|
* @td: Set of PM QoS timing parameters to attach to the device.
|
|
*/
|
|
int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
|
|
struct gpd_timing_data *td)
|
|
{
|
|
struct generic_pm_domain_data *gpd_data;
|
|
struct pm_domain_data *pdd;
|
|
int ret = 0;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev))
|
|
return -EINVAL;
|
|
|
|
gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL);
|
|
if (!gpd_data)
|
|
return -ENOMEM;
|
|
|
|
mutex_init(&gpd_data->lock);
|
|
gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier;
|
|
dev_pm_qos_add_notifier(dev, &gpd_data->nb);
|
|
|
|
genpd_acquire_lock(genpd);
|
|
|
|
if (genpd->prepared_count > 0) {
|
|
ret = -EAGAIN;
|
|
goto out;
|
|
}
|
|
|
|
list_for_each_entry(pdd, &genpd->dev_list, list_node)
|
|
if (pdd->dev == dev) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
genpd->device_count++;
|
|
genpd->max_off_time_changed = true;
|
|
|
|
dev_pm_get_subsys_data(dev);
|
|
|
|
mutex_lock(&gpd_data->lock);
|
|
spin_lock_irq(&dev->power.lock);
|
|
dev->pm_domain = &genpd->domain;
|
|
dev->power.subsys_data->domain_data = &gpd_data->base;
|
|
gpd_data->base.dev = dev;
|
|
list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);
|
|
gpd_data->need_restore = genpd->status == GPD_STATE_POWER_OFF;
|
|
if (td)
|
|
gpd_data->td = *td;
|
|
|
|
gpd_data->td.constraint_changed = true;
|
|
gpd_data->td.effective_constraint_ns = -1;
|
|
spin_unlock_irq(&dev->power.lock);
|
|
mutex_unlock(&gpd_data->lock);
|
|
|
|
genpd_release_lock(genpd);
|
|
|
|
return 0;
|
|
|
|
out:
|
|
genpd_release_lock(genpd);
|
|
|
|
dev_pm_qos_remove_notifier(dev, &gpd_data->nb);
|
|
kfree(gpd_data);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* __pm_genpd_of_add_device - Add a device to an I/O PM domain.
|
|
* @genpd_node: Device tree node pointer representing a PM domain to which the
|
|
* the device is added to.
|
|
* @dev: Device to be added.
|
|
* @td: Set of PM QoS timing parameters to attach to the device.
|
|
*/
|
|
int __pm_genpd_of_add_device(struct device_node *genpd_node, struct device *dev,
|
|
struct gpd_timing_data *td)
|
|
{
|
|
struct generic_pm_domain *genpd = NULL, *gpd;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
if (IS_ERR_OR_NULL(genpd_node) || IS_ERR_OR_NULL(dev))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&gpd_list_lock);
|
|
list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
|
|
if (gpd->of_node == genpd_node) {
|
|
genpd = gpd;
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&gpd_list_lock);
|
|
|
|
if (!genpd)
|
|
return -EINVAL;
|
|
|
|
return __pm_genpd_add_device(genpd, dev, td);
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_remove_device - Remove a device from an I/O PM domain.
|
|
* @genpd: PM domain to remove the device from.
|
|
* @dev: Device to be removed.
|
|
*/
|
|
int pm_genpd_remove_device(struct generic_pm_domain *genpd,
|
|
struct device *dev)
|
|
{
|
|
struct generic_pm_domain_data *gpd_data;
|
|
struct pm_domain_data *pdd;
|
|
int ret = 0;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)
|
|
|| IS_ERR_OR_NULL(dev->pm_domain)
|
|
|| pd_to_genpd(dev->pm_domain) != genpd)
|
|
return -EINVAL;
|
|
|
|
genpd_acquire_lock(genpd);
|
|
|
|
if (genpd->prepared_count > 0) {
|
|
ret = -EAGAIN;
|
|
goto out;
|
|
}
|
|
|
|
genpd->device_count--;
|
|
genpd->max_off_time_changed = true;
|
|
|
|
spin_lock_irq(&dev->power.lock);
|
|
dev->pm_domain = NULL;
|
|
pdd = dev->power.subsys_data->domain_data;
|
|
list_del_init(&pdd->list_node);
|
|
dev->power.subsys_data->domain_data = NULL;
|
|
spin_unlock_irq(&dev->power.lock);
|
|
|
|
gpd_data = to_gpd_data(pdd);
|
|
mutex_lock(&gpd_data->lock);
|
|
pdd->dev = NULL;
|
|
mutex_unlock(&gpd_data->lock);
|
|
|
|
genpd_release_lock(genpd);
|
|
|
|
dev_pm_qos_remove_notifier(dev, &gpd_data->nb);
|
|
kfree(gpd_data);
|
|
dev_pm_put_subsys_data(dev);
|
|
return 0;
|
|
|
|
out:
|
|
genpd_release_lock(genpd);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_dev_always_on - Set/unset the "always on" flag for a given device.
|
|
* @dev: Device to set/unset the flag for.
|
|
* @val: The new value of the device's "always on" flag.
|
|
*/
|
|
void pm_genpd_dev_always_on(struct device *dev, bool val)
|
|
{
|
|
struct pm_subsys_data *psd;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&dev->power.lock, flags);
|
|
|
|
psd = dev_to_psd(dev);
|
|
if (psd && psd->domain_data)
|
|
to_gpd_data(psd->domain_data)->always_on = val;
|
|
|
|
spin_unlock_irqrestore(&dev->power.lock, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pm_genpd_dev_always_on);
|
|
|
|
/**
|
|
* pm_genpd_dev_need_restore - Set/unset the device's "need restore" flag.
|
|
* @dev: Device to set/unset the flag for.
|
|
* @val: The new value of the device's "need restore" flag.
|
|
*/
|
|
void pm_genpd_dev_need_restore(struct device *dev, bool val)
|
|
{
|
|
struct pm_subsys_data *psd;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&dev->power.lock, flags);
|
|
|
|
psd = dev_to_psd(dev);
|
|
if (psd && psd->domain_data)
|
|
to_gpd_data(psd->domain_data)->need_restore = val;
|
|
|
|
spin_unlock_irqrestore(&dev->power.lock, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pm_genpd_dev_need_restore);
|
|
|
|
/**
|
|
* pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
|
|
* @genpd: Master PM domain to add the subdomain to.
|
|
* @subdomain: Subdomain to be added.
|
|
*/
|
|
int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
|
|
struct generic_pm_domain *subdomain)
|
|
{
|
|
struct gpd_link *link;
|
|
int ret = 0;
|
|
|
|
if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain))
|
|
return -EINVAL;
|
|
|
|
start:
|
|
genpd_acquire_lock(genpd);
|
|
mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING);
|
|
|
|
if (subdomain->status != GPD_STATE_POWER_OFF
|
|
&& subdomain->status != GPD_STATE_ACTIVE) {
|
|
mutex_unlock(&subdomain->lock);
|
|
genpd_release_lock(genpd);
|
|
goto start;
|
|
}
|
|
|
|
if (genpd->status == GPD_STATE_POWER_OFF
|
|
&& subdomain->status != GPD_STATE_POWER_OFF) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
list_for_each_entry(link, &genpd->master_links, master_node) {
|
|
if (link->slave == subdomain && link->master == genpd) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
link = kzalloc(sizeof(*link), GFP_KERNEL);
|
|
if (!link) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
link->master = genpd;
|
|
list_add_tail(&link->master_node, &genpd->master_links);
|
|
link->slave = subdomain;
|
|
list_add_tail(&link->slave_node, &subdomain->slave_links);
|
|
if (subdomain->status != GPD_STATE_POWER_OFF)
|
|
genpd_sd_counter_inc(genpd);
|
|
|
|
out:
|
|
mutex_unlock(&subdomain->lock);
|
|
genpd_release_lock(genpd);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.
|
|
* @genpd: Master PM domain to remove the subdomain from.
|
|
* @subdomain: Subdomain to be removed.
|
|
*/
|
|
int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
|
|
struct generic_pm_domain *subdomain)
|
|
{
|
|
struct gpd_link *link;
|
|
int ret = -EINVAL;
|
|
|
|
if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain))
|
|
return -EINVAL;
|
|
|
|
start:
|
|
genpd_acquire_lock(genpd);
|
|
|
|
list_for_each_entry(link, &genpd->master_links, master_node) {
|
|
if (link->slave != subdomain)
|
|
continue;
|
|
|
|
mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING);
|
|
|
|
if (subdomain->status != GPD_STATE_POWER_OFF
|
|
&& subdomain->status != GPD_STATE_ACTIVE) {
|
|
mutex_unlock(&subdomain->lock);
|
|
genpd_release_lock(genpd);
|
|
goto start;
|
|
}
|
|
|
|
list_del(&link->master_node);
|
|
list_del(&link->slave_node);
|
|
kfree(link);
|
|
if (subdomain->status != GPD_STATE_POWER_OFF)
|
|
genpd_sd_counter_dec(genpd);
|
|
|
|
mutex_unlock(&subdomain->lock);
|
|
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
genpd_release_lock(genpd);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_add_callbacks - Add PM domain callbacks to a given device.
|
|
* @dev: Device to add the callbacks to.
|
|
* @ops: Set of callbacks to add.
|
|
* @td: Timing data to add to the device along with the callbacks (optional).
|
|
*/
|
|
int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops,
|
|
struct gpd_timing_data *td)
|
|
{
|
|
struct pm_domain_data *pdd;
|
|
int ret = 0;
|
|
|
|
if (!(dev && dev->power.subsys_data && ops))
|
|
return -EINVAL;
|
|
|
|
pm_runtime_disable(dev);
|
|
device_pm_lock();
|
|
|
|
pdd = dev->power.subsys_data->domain_data;
|
|
if (pdd) {
|
|
struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd);
|
|
|
|
gpd_data->ops = *ops;
|
|
if (td)
|
|
gpd_data->td = *td;
|
|
} else {
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
device_pm_unlock();
|
|
pm_runtime_enable(dev);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pm_genpd_add_callbacks);
|
|
|
|
/**
|
|
* __pm_genpd_remove_callbacks - Remove PM domain callbacks from a given device.
|
|
* @dev: Device to remove the callbacks from.
|
|
* @clear_td: If set, clear the device's timing data too.
|
|
*/
|
|
int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td)
|
|
{
|
|
struct pm_domain_data *pdd;
|
|
int ret = 0;
|
|
|
|
if (!(dev && dev->power.subsys_data))
|
|
return -EINVAL;
|
|
|
|
pm_runtime_disable(dev);
|
|
device_pm_lock();
|
|
|
|
pdd = dev->power.subsys_data->domain_data;
|
|
if (pdd) {
|
|
struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd);
|
|
|
|
gpd_data->ops = (struct gpd_dev_ops){ 0 };
|
|
if (clear_td)
|
|
gpd_data->td = (struct gpd_timing_data){ 0 };
|
|
} else {
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
device_pm_unlock();
|
|
pm_runtime_enable(dev);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__pm_genpd_remove_callbacks);
|
|
|
|
/* Default device callbacks for generic PM domains. */
|
|
|
|
/**
|
|
* pm_genpd_default_save_state - Default "save device state" for PM domians.
|
|
* @dev: Device to handle.
|
|
*/
|
|
static int pm_genpd_default_save_state(struct device *dev)
|
|
{
|
|
int (*cb)(struct device *__dev);
|
|
struct device_driver *drv = dev->driver;
|
|
|
|
cb = dev_gpd_data(dev)->ops.save_state;
|
|
if (cb)
|
|
return cb(dev);
|
|
|
|
if (drv && drv->pm && drv->pm->runtime_suspend)
|
|
return drv->pm->runtime_suspend(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_default_restore_state - Default PM domians "restore device state".
|
|
* @dev: Device to handle.
|
|
*/
|
|
static int pm_genpd_default_restore_state(struct device *dev)
|
|
{
|
|
int (*cb)(struct device *__dev);
|
|
struct device_driver *drv = dev->driver;
|
|
|
|
cb = dev_gpd_data(dev)->ops.restore_state;
|
|
if (cb)
|
|
return cb(dev);
|
|
|
|
if (drv && drv->pm && drv->pm->runtime_resume)
|
|
return drv->pm->runtime_resume(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
|
|
/**
|
|
* pm_genpd_default_suspend - Default "device suspend" for PM domians.
|
|
* @dev: Device to handle.
|
|
*/
|
|
static int pm_genpd_default_suspend(struct device *dev)
|
|
{
|
|
int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.suspend;
|
|
|
|
return cb ? cb(dev) : pm_generic_suspend(dev);
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_default_suspend_late - Default "late device suspend" for PM domians.
|
|
* @dev: Device to handle.
|
|
*/
|
|
static int pm_genpd_default_suspend_late(struct device *dev)
|
|
{
|
|
int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.suspend_late;
|
|
|
|
return cb ? cb(dev) : pm_generic_suspend_late(dev);
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_default_resume_early - Default "early device resume" for PM domians.
|
|
* @dev: Device to handle.
|
|
*/
|
|
static int pm_genpd_default_resume_early(struct device *dev)
|
|
{
|
|
int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.resume_early;
|
|
|
|
return cb ? cb(dev) : pm_generic_resume_early(dev);
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_default_resume - Default "device resume" for PM domians.
|
|
* @dev: Device to handle.
|
|
*/
|
|
static int pm_genpd_default_resume(struct device *dev)
|
|
{
|
|
int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.resume;
|
|
|
|
return cb ? cb(dev) : pm_generic_resume(dev);
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_default_freeze - Default "device freeze" for PM domians.
|
|
* @dev: Device to handle.
|
|
*/
|
|
static int pm_genpd_default_freeze(struct device *dev)
|
|
{
|
|
int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze;
|
|
|
|
return cb ? cb(dev) : pm_generic_freeze(dev);
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_default_freeze_late - Default "late device freeze" for PM domians.
|
|
* @dev: Device to handle.
|
|
*/
|
|
static int pm_genpd_default_freeze_late(struct device *dev)
|
|
{
|
|
int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze_late;
|
|
|
|
return cb ? cb(dev) : pm_generic_freeze_late(dev);
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_default_thaw_early - Default "early device thaw" for PM domians.
|
|
* @dev: Device to handle.
|
|
*/
|
|
static int pm_genpd_default_thaw_early(struct device *dev)
|
|
{
|
|
int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw_early;
|
|
|
|
return cb ? cb(dev) : pm_generic_thaw_early(dev);
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_default_thaw - Default "device thaw" for PM domians.
|
|
* @dev: Device to handle.
|
|
*/
|
|
static int pm_genpd_default_thaw(struct device *dev)
|
|
{
|
|
int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw;
|
|
|
|
return cb ? cb(dev) : pm_generic_thaw(dev);
|
|
}
|
|
|
|
#else /* !CONFIG_PM_SLEEP */
|
|
|
|
#define pm_genpd_default_suspend NULL
|
|
#define pm_genpd_default_suspend_late NULL
|
|
#define pm_genpd_default_resume_early NULL
|
|
#define pm_genpd_default_resume NULL
|
|
#define pm_genpd_default_freeze NULL
|
|
#define pm_genpd_default_freeze_late NULL
|
|
#define pm_genpd_default_thaw_early NULL
|
|
#define pm_genpd_default_thaw NULL
|
|
|
|
#endif /* !CONFIG_PM_SLEEP */
|
|
|
|
/**
|
|
* pm_genpd_init - Initialize a generic I/O PM domain object.
|
|
* @genpd: PM domain object to initialize.
|
|
* @gov: PM domain governor to associate with the domain (may be NULL).
|
|
* @is_off: Initial value of the domain's power_is_off field.
|
|
*/
|
|
void pm_genpd_init(struct generic_pm_domain *genpd,
|
|
struct dev_power_governor *gov, bool is_off)
|
|
{
|
|
if (IS_ERR_OR_NULL(genpd))
|
|
return;
|
|
|
|
INIT_LIST_HEAD(&genpd->master_links);
|
|
INIT_LIST_HEAD(&genpd->slave_links);
|
|
INIT_LIST_HEAD(&genpd->dev_list);
|
|
mutex_init(&genpd->lock);
|
|
genpd->gov = gov;
|
|
INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn);
|
|
genpd->in_progress = 0;
|
|
atomic_set(&genpd->sd_count, 0);
|
|
genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE;
|
|
init_waitqueue_head(&genpd->status_wait_queue);
|
|
genpd->poweroff_task = NULL;
|
|
genpd->resume_count = 0;
|
|
genpd->device_count = 0;
|
|
genpd->max_off_time_ns = -1;
|
|
genpd->max_off_time_changed = true;
|
|
genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend;
|
|
genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume;
|
|
genpd->domain.ops.runtime_idle = pm_generic_runtime_idle;
|
|
genpd->domain.ops.prepare = pm_genpd_prepare;
|
|
genpd->domain.ops.suspend = pm_genpd_suspend;
|
|
genpd->domain.ops.suspend_late = pm_genpd_suspend_late;
|
|
genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq;
|
|
genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq;
|
|
genpd->domain.ops.resume_early = pm_genpd_resume_early;
|
|
genpd->domain.ops.resume = pm_genpd_resume;
|
|
genpd->domain.ops.freeze = pm_genpd_freeze;
|
|
genpd->domain.ops.freeze_late = pm_genpd_freeze_late;
|
|
genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq;
|
|
genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq;
|
|
genpd->domain.ops.thaw_early = pm_genpd_thaw_early;
|
|
genpd->domain.ops.thaw = pm_genpd_thaw;
|
|
genpd->domain.ops.poweroff = pm_genpd_suspend;
|
|
genpd->domain.ops.poweroff_late = pm_genpd_suspend_late;
|
|
genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq;
|
|
genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq;
|
|
genpd->domain.ops.restore_early = pm_genpd_resume_early;
|
|
genpd->domain.ops.restore = pm_genpd_resume;
|
|
genpd->domain.ops.complete = pm_genpd_complete;
|
|
genpd->dev_ops.save_state = pm_genpd_default_save_state;
|
|
genpd->dev_ops.restore_state = pm_genpd_default_restore_state;
|
|
genpd->dev_ops.suspend = pm_genpd_default_suspend;
|
|
genpd->dev_ops.suspend_late = pm_genpd_default_suspend_late;
|
|
genpd->dev_ops.resume_early = pm_genpd_default_resume_early;
|
|
genpd->dev_ops.resume = pm_genpd_default_resume;
|
|
genpd->dev_ops.freeze = pm_genpd_default_freeze;
|
|
genpd->dev_ops.freeze_late = pm_genpd_default_freeze_late;
|
|
genpd->dev_ops.thaw_early = pm_genpd_default_thaw_early;
|
|
genpd->dev_ops.thaw = pm_genpd_default_thaw;
|
|
mutex_lock(&gpd_list_lock);
|
|
list_add(&genpd->gpd_list_node, &gpd_list);
|
|
mutex_unlock(&gpd_list_lock);
|
|
}
|