1 files changed, 0 insertions, 414 deletions
diff --git a/drivers/base/power/domain_governor.c b/drivers/base/power/domain_governor.c
deleted file mode 100644
index cc2c3a5a6d35..000000000000
--- a/drivers/base/power/domain_governor.c
+++ /dev/null
@@ -1,414 +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.
- */
-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.
- */
-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_genpd_gov_always_on - A governor implementing an always-on policy
- */
-struct dev_power_governor pm_domain_always_on_gov = {
-	.suspend_ok = default_suspend_ok,
-};