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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-04-25 23:17:07 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-04-25 23:17:07 +0200
commit40aa4db6d530e2ea71e00765df77ac78477e8348 (patch)
tree0a8c4d8d7fd610077b7053609acf981f18c5b043 /drivers/base
parent3ccf3f0cd1971e007680114ff732e8a717aafbf8 (diff)
parente94999688e3aa3c0a8ad5a60352cdc3ca3030434 (diff)
downloadlinux-40aa4db6d530e2ea71e00765df77ac78477e8348.tar.bz2
Merge cpuidle material depended on by the subsequent changes.
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/domain.c77
-rw-r--r--drivers/base/power/domain_governor.c67
2 files changed, 140 insertions, 4 deletions
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index d97bcf6918fb..8362dfe187f5 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -22,6 +22,7 @@
#include <linux/sched.h>
#include <linux/suspend.h>
#include <linux/export.h>
+#include <linux/cpu.h>
#include "power.h"
@@ -128,6 +129,7 @@ static const struct genpd_lock_ops genpd_spin_ops = {
#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)
static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev,
const struct generic_pm_domain *genpd)
@@ -1452,6 +1454,56 @@ static void genpd_free_dev_data(struct device *dev,
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->slave_links, slave_node) {
+ struct generic_pm_domain *master = link->master;
+
+ genpd_lock_nested(master, depth + 1);
+ __genpd_update_cpumask(master, cpu, set, depth + 1);
+ genpd_unlock(master);
+ }
+
+ if (set)
+ cpumask_set_cpu(cpu, genpd->cpus);
+ else
+ cpumask_clear_cpu(cpu, genpd->cpus);
+}
+
+static void genpd_update_cpumask(struct generic_pm_domain *genpd,
+ struct device *dev, bool set)
+{
+ int cpu;
+
+ if (!genpd_is_cpu_domain(genpd))
+ return;
+
+ for_each_possible_cpu(cpu) {
+ if (get_cpu_device(cpu) == dev) {
+ __genpd_update_cpumask(genpd, cpu, set, 0);
+ return;
+ }
+ }
+}
+
+static void genpd_set_cpumask(struct generic_pm_domain *genpd,
+ struct device *dev)
+{
+ genpd_update_cpumask(genpd, dev, true);
+}
+
+static void genpd_clear_cpumask(struct generic_pm_domain *genpd,
+ struct device *dev)
+{
+ genpd_update_cpumask(genpd, dev, false);
+}
+
static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
struct gpd_timing_data *td)
{
@@ -1473,6 +1525,7 @@ static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
genpd_lock(genpd);
+ genpd_set_cpumask(genpd, dev);
dev_pm_domain_set(dev, &genpd->domain);
genpd->device_count++;
@@ -1530,6 +1583,7 @@ static int genpd_remove_device(struct generic_pm_domain *genpd,
genpd->device_count--;
genpd->max_off_time_changed = true;
+ genpd_clear_cpumask(genpd, dev);
dev_pm_domain_set(dev, NULL);
list_del_init(&pdd->list_node);
@@ -1684,6 +1738,12 @@ out:
}
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;
@@ -1694,7 +1754,7 @@ static int genpd_set_default_power_state(struct generic_pm_domain *genpd)
genpd->states = state;
genpd->state_count = 1;
- genpd->free = state;
+ genpd->free_states = genpd_free_default_power_state;
return 0;
}
@@ -1760,11 +1820,18 @@ int pm_genpd_init(struct generic_pm_domain *genpd,
if (genpd_is_always_on(genpd) && !genpd_status_on(genpd))
return -EINVAL;
+ if (genpd_is_cpu_domain(genpd) &&
+ !zalloc_cpumask_var(&genpd->cpus, GFP_KERNEL))
+ return -ENOMEM;
+
/* 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)
+ if (ret) {
+ if (genpd_is_cpu_domain(genpd))
+ free_cpumask_var(genpd->cpus);
return ret;
+ }
} else if (!gov && genpd->state_count > 1) {
pr_warn("%s: no governor for states\n", genpd->name);
}
@@ -1810,7 +1877,11 @@ static int genpd_remove(struct generic_pm_domain *genpd)
list_del(&genpd->gpd_list_node);
genpd_unlock(genpd);
cancel_work_sync(&genpd->power_off_work);
- kfree(genpd->free);
+ if (genpd_is_cpu_domain(genpd))
+ free_cpumask_var(genpd->cpus);
+ if (genpd->free_states)
+ genpd->free_states(genpd->states, genpd->state_count);
+
pr_debug("%s: removed %s\n", __func__, genpd->name);
return 0;
diff --git a/drivers/base/power/domain_governor.c b/drivers/base/power/domain_governor.c
index 4d07e38a8247..7912bc957244 100644
--- a/drivers/base/power/domain_governor.c
+++ b/drivers/base/power/domain_governor.c
@@ -10,6 +10,9 @@
#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 +213,10 @@ 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 +241,7 @@ 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 +250,65 @@ 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,