PM / Domains: Add default power off governor function (v4)

Add a function deciding whether or not a given PM domain should
be powered off on the basis of the PM QoS constraints of devices
belonging to it and their PM QoS timing data.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 3af9f5a..9189619 100644 (file)
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -398,6 +398,17 @@ static int pm_genpd_poweroff(struct generic_pm_domain *genpd)
        }
 
        genpd->status = GPD_STATE_POWER_OFF;
+       genpd->power_off_time = ktime_get();
+
+       /* Update PM QoS information for devices in the domain. */
+       list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) {
+               struct gpd_timing_data *td = &to_gpd_data(pdd)->td;
+
+               pm_runtime_update_max_time_suspended(pdd->dev,
+                                       td->start_latency_ns +
+                                       td->restore_state_latency_ns +
+                                       genpd->power_on_latency_ns);
+       }
 
        list_for_each_entry(link, &genpd->slave_links, slave_node) {
                genpd_sd_counter_dec(link->master);
@@ -1487,6 +1498,7 @@ void pm_genpd_init(struct generic_pm_domain *genpd,
        genpd->resume_count = 0;
        genpd->device_count = 0;
        genpd->suspended_count = 0;
+       genpd->max_off_time_ns = -1;
        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;

diff --git a/drivers/base/power/domain_governor.c b/drivers/base/power/domain_governor.c
index 97b21c1..da78540 100644 (file)
--- a/drivers/base/power/domain_governor.c
+++ b/drivers/base/power/domain_governor.c
@@ -10,6 +10,7 @@
 #include <linux/kernel.h>
 #include <linux/pm_domain.h>
 #include <linux/pm_qos.h>
+#include <linux/hrtimer.h>
 
 /**
  * default_stop_ok - Default PM domain governor routine for stopping devices.
@@ -28,6 +29,115 @@ bool default_stop_ok(struct device *dev)
                && td->break_even_ns < dev->power.max_time_suspended_ns;
 }
 
+/**
+ * default_power_down_ok - Default generic PM domain power off governor routine.
+ * @pd: PM domain to check.
+ *
+ * This routine must be executed under the PM domain's lock.
+ */
+static bool default_power_down_ok(struct dev_pm_domain *pd)
+{
+       struct generic_pm_domain *genpd = pd_to_genpd(pd);
+       struct gpd_link *link;
+       struct pm_domain_data *pdd;
+       s64 min_dev_off_time_ns;
+       s64 off_on_time_ns;
+       ktime_t time_now = ktime_get();
+
+       off_on_time_ns = genpd->power_off_latency_ns +
+                               genpd->power_on_latency_ns;
+       /*
+        * It doesn't make sense to remove power from the domain if saving
+        * the state of all devices in it and the power off/power on operations
+        * take too much time.
+        *
+        * All devices in this domain have been stopped already at this point.
+        */
+       list_for_each_entry(pdd, &genpd->dev_list, list_node) {
+               if (pdd->dev->driver)
+                       off_on_time_ns +=
+                               to_gpd_data(pdd)->td.save_state_latency_ns;
+       }
+
+       /*
+        * 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->master_links, master_node) {
+               struct generic_pm_domain *sd = link->slave;
+               s64 sd_max_off_ns = sd->max_off_time_ns;
+
+               if (sd_max_off_ns < 0)
+                       continue;
+
+               sd_max_off_ns -= ktime_to_ns(ktime_sub(time_now,
+                                                      sd->power_off_time));
+               /*
+                * 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;
+       }
+
+       /*
+        * Check if the devices in the domain can be off enough time.
+        */
+       min_dev_off_time_ns = -1;
+       list_for_each_entry(pdd, &genpd->dev_list, list_node) {
+               struct gpd_timing_data *td;
+               struct device *dev = pdd->dev;
+               s64 dev_off_time_ns;
+
+               if (!dev->driver || dev->power.max_time_suspended_ns < 0)
+                       continue;
+
+               td = &to_gpd_data(pdd)->td;
+               dev_off_time_ns = dev->power.max_time_suspended_ns -
+                       (td->start_latency_ns + td->restore_state_latency_ns +
+                               ktime_to_ns(ktime_sub(time_now,
+                                               dev->power.suspend_time)));
+               if (dev_off_time_ns <= off_on_time_ns)
+                       return false;
+
+               if (min_dev_off_time_ns > dev_off_time_ns
+                   || min_dev_off_time_ns < 0)
+                       min_dev_off_time_ns = dev_off_time_ns;
+       }
+
+       if (min_dev_off_time_ns < 0) {
+               /*
+                * There are no latency constraints, so the domain can spend
+                * arbitrary time in the "off" state.
+                */
+               genpd->max_off_time_ns = -1;
+               return true;
+       }
+
+       /*
+        * The difference between the computed minimum delta and the time needed
+        * to turn the domain on is the maximum theoretical time this domain can
+        * spend in the "off" state.
+        */
+       min_dev_off_time_ns -= genpd->power_on_latency_ns;
+
+       /*
+        * If the difference between the computed minimum delta and the time
+        * needed to turn the domain off and back on on is smaller than the
+        * domain's power break even time, removing power from the domain is not
+        * worth it.
+        */
+       if (genpd->break_even_ns >
+           min_dev_off_time_ns - genpd->power_off_latency_ns)
+               return false;
+
+       genpd->max_off_time_ns = min_dev_off_time_ns;
+       return true;
+}
+
 struct dev_power_governor simple_qos_governor = {
        .stop_ok = default_stop_ok,
+       .power_down_ok = default_power_down_ok,
 };

diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index f6745c2..cc1a245 100644 (file)
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -61,8 +61,13 @@ struct generic_pm_domain {
        bool suspend_power_off; /* Power status before system suspend */
        bool dev_irq_safe;      /* Device callbacks are IRQ-safe */
        int (*power_off)(struct generic_pm_domain *domain);
+       s64 power_off_latency_ns;
        int (*power_on)(struct generic_pm_domain *domain);
+       s64 power_on_latency_ns;
        struct gpd_dev_ops dev_ops;
+       s64 break_even_ns;      /* Power break even for the entire domain. */
+       s64 max_off_time_ns;    /* Maximum allowed "suspended" time. */
+       ktime_t power_off_time;
 };
 
 static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
@@ -80,6 +85,8 @@ struct gpd_link {
 struct gpd_timing_data {
        s64 stop_latency_ns;
        s64 start_latency_ns;
+       s64 save_state_latency_ns;
+       s64 restore_state_latency_ns;
        s64 break_even_ns;
 };