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authorRafael J. Wysocki <rjw@sisk.pl>2011-11-30 18:01:31 -0500
committerRafael J. Wysocki <rjw@sisk.pl>2011-12-01 15:46:42 -0500
commit00dc9ad18d707f36b2fb4af98fd2cf0548d2b258 (patch)
treef41672d9dae9bf15f2ee17abf3b5b6c31c966088 /include/linux/pm.h
parentb930c26416c4ea6855726fd977145ccea9afbdda (diff)
PM / Runtime: Use device PM QoS constraints (v2)
Make the runtime PM core use device PM QoS constraints to check if it is allowed to suspend a given device, so that an error code is returned if the device's own PM QoS constraint is negative or one of its children has already been suspended for too long. If this is not the case, the maximum estimated time the device is allowed to be suspended, computed as the minimum of the device's PM QoS constraint and the PM QoS constraints of its children (reduced by the difference between the current time and their suspend times) is stored in a new device's PM field power.max_time_suspended_ns that can be used by the device's subsystem or PM domain to decide whether or not to put the device into lower-power (and presumably higher-latency) states later (if the constraint is 0, which means "no constraint", the power.max_time_suspended_ns is set to -1). Additionally, the time of execution of the subsystem-level .runtime_suspend() callback for the device is recorded in the new power.suspend_time field for later use by the device's subsystem or PM domain along with power.max_time_suspended_ns (it also is used by the core code when the device's parent is suspended). Introduce a new helper function, pm_runtime_update_max_time_suspended(), allowing subsystems and PM domains (or device drivers) to update the power.max_time_suspended_ns field, for example after changing the power state of a suspended device. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'include/linux/pm.h')
-rw-r--r--include/linux/pm.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/pm.h b/include/linux/pm.h
index 3f3ed83a9aa5..a7676efa6831 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -521,6 +521,8 @@ struct dev_pm_info {
521 unsigned long active_jiffies; 521 unsigned long active_jiffies;
522 unsigned long suspended_jiffies; 522 unsigned long suspended_jiffies;
523 unsigned long accounting_timestamp; 523 unsigned long accounting_timestamp;
524 ktime_t suspend_time;
525 s64 max_time_suspended_ns;
524#endif 526#endif
525 struct pm_subsys_data *subsys_data; /* Owned by the subsystem. */ 527 struct pm_subsys_data *subsys_data; /* Owned by the subsystem. */
526 struct pm_qos_constraints *constraints; 528 struct pm_qos_constraints *constraints;