PM / Domains: Add power off/on function for system core suspend stage

Introduce function pm_genpd_syscore_switch() and two wrappers around
it, pm_genpd_syscore_poweroff() and pm_genpd_syscore_poweron(),
allowing the callers to let the generic PM domains framework know
that the given device is not necessary any more and its PM domain
can be turned off (the former) or that the given device will be
required immediately, so its PM domain has to be turned on (the
latter) during the system core (syscore) stage of system suspend
(or hibernation) and resume.

These functions will be used for handling devices registered as
clock sources and clock event devices that belong to PM domains.

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

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 55c39f5b7a59cc4ead86c4d4984fc4abb61bad36..515c8ecf01ce6dd58e2fc5fe252d2cc4b94f27c4 100644 (file)
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -697,6 +697,24 @@ static inline void genpd_power_off_work_fn(struct work_struct *work) {}
 
 #ifdef CONFIG_PM_SLEEP
 
+/**
+ * pm_genpd_present - Check if the given PM domain has been initialized.
+ * @genpd: PM domain to check.
+ */
+static bool pm_genpd_present(struct generic_pm_domain *genpd)
+{
+       struct generic_pm_domain *gpd;
+
+       if (IS_ERR_OR_NULL(genpd))
+               return false;
+
+       list_for_each_entry(gpd, &gpd_list, gpd_list_node)
+               if (gpd == genpd)
+                       return true;
+
+       return false;
+}
+
 static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd,
                                    struct device *dev)
 {
@@ -750,9 +768,10 @@ static int genpd_thaw_dev(struct generic_pm_domain *genpd, struct device *dev)
  * Check if the given PM domain can be powered off (during system suspend or
  * hibernation) and do that if so.  Also, in that case propagate to its masters.
  *
- * This function is only called in "noirq" stages of system power transitions,
- * so it need not acquire locks (all of the "noirq" callbacks are executed
- * sequentially, so it is guaranteed that it will never run twice in parallel).
+ * This function is only called in "noirq" and "syscore" stages of system power
+ * transitions, so it need not acquire locks (all of the "noirq" callbacks are
+ * executed sequentially, so it is guaranteed that it will never run twice in
+ * parallel).
  */
 static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd)
 {
@@ -780,9 +799,10 @@ static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd)
  * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters.
  * @genpd: PM domain to power on.
  *
- * This function is only called in "noirq" stage of system power transitions, so
- * it need not acquire locks (all of the "noirq" callbacks are executed
- * sequentially, so it is guaranteed that it will never run twice in parallel).
+ * This function is only called in "noirq" and "syscore" stages of system power
+ * transitions, so it need not acquire locks (all of the "noirq" callbacks are
+ * executed sequentially, so it is guaranteed that it will never run twice in
+ * parallel).
  */
 static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd)
 {
@@ -1272,6 +1292,31 @@ static void pm_genpd_complete(struct device *dev)
        }
 }
 
+/**
+ * pm_genpd_syscore_switch - Switch power during system core suspend or resume.
+ * @dev: Device that normally is marked as "always on" to switch power for.
+ *
+ * This routine may only be called during the system core (syscore) suspend or
+ * resume phase for devices whose "always on" flags are set.
+ */
+void pm_genpd_syscore_switch(struct device *dev, bool suspend)
+{
+       struct generic_pm_domain *genpd;
+
+       genpd = dev_to_genpd(dev);
+       if (!pm_genpd_present(genpd))
+               return;
+
+       if (suspend) {
+               genpd->suspended_count++;
+               pm_genpd_sync_poweroff(genpd);
+       } else {
+               pm_genpd_sync_poweron(genpd);
+               genpd->suspended_count--;
+       }
+}
+EXPORT_SYMBOL_GPL(pm_genpd_syscore_switch);
+
 #else
 
 #define pm_genpd_prepare               NULL

diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index a7d6172922d405c950c701bf4a7d2d21bb4e0c77..ab83cf3dfaacb1e8291c03fc4dc7ebcc79abc611 100644 (file)
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -258,4 +258,20 @@ static inline void genpd_queue_power_off_work(struct generic_pm_domain *gpd) {}
 static inline void pm_genpd_poweroff_unused(void) {}
 #endif
 
+#ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
+extern void pm_genpd_syscore_switch(struct device *dev, bool suspend);
+#else
+static inline void pm_genpd_syscore_switch(struct device *dev, bool suspend) {}
+#endif
+
+static inline void pm_genpd_syscore_poweroff(struct device *dev)
+{
+       pm_genpd_syscore_switch(dev, true);
+}
+
+static inline void pm_genpd_syscore_poweron(struct device *dev)
+{
+       pm_genpd_syscore_switch(dev, false);
+}
+
 #endif /* _LINUX_PM_DOMAIN_H */

diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index a70518c9d82f42c57eb400208ce95dd4dd2aafaa..5dfdc9ea180b8ac497ed915c45b809fb65799261 100644 (file)
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -263,6 +263,10 @@ config PM_GENERIC_DOMAINS
        bool
        depends on PM
 
+config PM_GENERIC_DOMAINS_SLEEP
+       def_bool y
+       depends on PM_SLEEP && PM_GENERIC_DOMAINS
+
 config PM_GENERIC_DOMAINS_RUNTIME
        def_bool y
        depends on PM_RUNTIME && PM_GENERIC_DOMAINS