PM / Domains: Use power.sybsys_data to reduce overhead

Currently pm_genpd_runtime_resume() has to walk the list of devices
from the device's PM domain to find the corresponding device list
object containing the need_restore field to check if the driver's
.runtime_resume() callback should be executed for the device.
This is suboptimal and can be simplified by using power.sybsys_data
to store device information used by the generic PM domains code.

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

1 files changed, 9 insertions, 0 deletions

diff --git a/include/linux/pm.h b/include/linux/pm.h
index c6b5a0a41ab3..ed10f24d5259 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -421,12 +421,21 @@ enum rpm_request {
 
 struct wakeup_source;
 
+struct pm_domain_data {
+        struct list_head list_node;
+        struct device *dev;
+        bool need_restore;
+};
+
 struct pm_subsys_data {
         spinlock_t lock;
         unsigned int refcount;
 #ifdef CONFIG_PM_CLK
         struct list_head clock_list;
 #endif
+#ifdef CONFIG_PM_GENERIC_DOMAINS
+        struct pm_domain_data domain_data;
+#endif
 };
 
 struct dev_pm_info {