diff options
Diffstat (limited to 'drivers/base/power/domain_governor.c')
| -rw-r--r-- | drivers/base/power/domain_governor.c | 71 |
1 files changed, 67 insertions, 4 deletions
diff --git a/drivers/base/power/domain_governor.c b/drivers/base/power/domain_governor.c index 4d07e38a8247..3838045c9277 100644 --- a/drivers/base/power/domain_governor.c +++ b/drivers/base/power/domain_governor.c @@ -1,15 +1,16 @@ +// 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. - * - * This file is released under the GPLv2. */ - #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) { @@ -210,8 +211,10 @@ static bool default_power_down_ok(struct dev_pm_domain *pd) struct generic_pm_domain *genpd = pd_to_genpd(pd); struct gpd_link *link; - if (!genpd->max_off_time_changed) + if (!genpd->max_off_time_changed) { + genpd->state_idx = genpd->cached_power_down_state_idx; return genpd->cached_power_down_ok; + } /* * We have to invalidate the cached results for the masters, so @@ -236,6 +239,7 @@ static bool default_power_down_ok(struct dev_pm_domain *pd) genpd->state_idx--; } + genpd->cached_power_down_state_idx = genpd->state_idx; return genpd->cached_power_down_ok; } @@ -244,6 +248,65 @@ static bool always_on_power_down_ok(struct dev_pm_domain *domain) return false; } +#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; + s64 idle_duration_ns; + int cpu, i; + + /* Validate dev PM QoS constraints. */ + if (!default_power_down_ok(pd)) + 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, ktime_get())); + if (idle_duration_ns <= 0) + return false; + + /* + * 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, |