From: Youngtae Lee <yt0729.lee@samsung.com>
Date: Thu, 2 Nov 2017 11:36:17 +0000 (+0900)
Subject: kernel: Add PRE/POST noti for cpu pm
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=15ee69803e88063f51f8b41e992a9676bc88e2e2;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

kernel: Add PRE/POST noti for cpu pm

CPU_PM_ENTER_PREPARE is called before adding a timer event.
CPU_PM_EXIT is called after CPU_PM_EXIT.

Change-Id: I339cdcc1d20bbbbeb85de9f3b8bbf79150c7dfe5
Signed-off-by: Youngtae Lee <yt0729.lee@samsung.com>
---

diff --git a/include/linux/cpu_pm.h b/include/linux/cpu_pm.h
index 455b233dd3b1..9a3bc18a493b 100644
--- a/include/linux/cpu_pm.h
+++ b/include/linux/cpu_pm.h
@@ -47,6 +47,9 @@
  * Event codes passed as unsigned long val to notifier calls
  */
 enum cpu_pm_event {
+	/* A single cpu is preparing lopower state */
+	CPU_PM_ENTER_PREPARE,
+
 	/* A single cpu is entering a low power state */
 	CPU_PM_ENTER,
 
@@ -56,6 +59,9 @@ enum cpu_pm_event {
 	/* A single cpu is exiting a low power state */
 	CPU_PM_EXIT,
 
+	/* A single cpu is post existing a low power state */
+	CPU_PM_EXIT_POST,
+
 	/* A cpu power domain is entering a low power state */
 	CPU_CLUSTER_PM_ENTER,
 
@@ -73,6 +79,8 @@ int cpu_pm_enter(void);
 int cpu_pm_exit(void);
 int cpu_cluster_pm_enter(void);
 int cpu_cluster_pm_exit(void);
+int cpu_pm_enter_pre(void);
+int cpu_pm_exit_post(void);
 
 #else
 
@@ -105,5 +113,16 @@ static inline int cpu_cluster_pm_exit(void)
 {
 	return 0;
 }
+
+static inline int cpu_pm_enter_pre(void)
+{
+	return 0;
+}
+
+static inline int cpu_pm_exit_post(void)
+{
+	return 0;
+}
+
 #endif
 #endif
diff --git a/kernel/cpu_pm.c b/kernel/cpu_pm.c
index 67b02e138a47..ea4135831b33 100644
--- a/kernel/cpu_pm.c
+++ b/kernel/cpu_pm.c
@@ -104,6 +104,12 @@ int cpu_pm_enter(void)
 }
 EXPORT_SYMBOL_GPL(cpu_pm_enter);
 
+int cpu_pm_enter_pre(void)
+{
+	return cpu_pm_notify(CPU_PM_ENTER_PREPARE, -1, NULL);
+}
+EXPORT_SYMBOL_GPL(cpu_pm_enter_pre);
+
 /**
  * cpu_pm_exit - CPU low power exit notifier
  *
@@ -122,6 +128,12 @@ int cpu_pm_exit(void)
 }
 EXPORT_SYMBOL_GPL(cpu_pm_exit);
 
+int cpu_pm_exit_post(void)
+{
+	return cpu_pm_notify(CPU_PM_EXIT_POST, -1, NULL);
+}
+EXPORT_SYMBOL_GPL(cpu_pm_exit_post);
+
 /**
  * cpu_cluster_pm_enter - CPU cluster low power entry notifier
  *
diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index c1dbb2cc1f29..7f2d0145f71e 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -11,6 +11,7 @@
 #include <linux/stackprotector.h>
 #include <linux/suspend.h>
 #include <linux/livepatch.h>
+#include <linux/cpu_pm.h>
 
 #include <asm/tlb.h>
 
@@ -220,6 +221,7 @@ static void do_idle(void)
 	 */
 
 	__current_set_polling();
+	cpu_pm_enter_pre();
 	quiet_vmstat();
 	tick_nohz_idle_enter();
 
@@ -255,6 +257,7 @@ static void do_idle(void)
 	 * This is required because for polling idle loops we will not have had
 	 * an IPI to fold the state for us.
 	 */
+	cpu_pm_exit_post();
 	preempt_set_need_resched();
 	tick_nohz_idle_exit();
 	__current_clr_polling();