linux-kernel - [RFC 1/7] sched: idle: Add sched get idle state helper

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Date:   Wed, 27 Mar 2019 13:21:07 +0000
From:   Abel Vesa <abel.vesa@....com>
To:     Sudeep Holla <sudeep.holla@....com>,
        Marc Zyngier <marc.zyngier@....com>,
        Rob Herring <robh@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Fabio Estevam <fabio.estevam@....com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Aisheng Dong <aisheng.dong@....com>
CC:     dl-linux-imx <linux-imx@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        Abel Vesa <abel.vesa@....com>
Subject: [RFC 1/7] sched: idle: Add sched get idle state helper

This helper is useful in order to get the idle state of a specific cpu.

Signed-off-by: Abel Vesa <abel.vesa@....com>
---
 include/linux/cpuidle.h |  1 +
 kernel/sched/idle.c     | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index 3b39472..88a9119 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -211,6 +211,7 @@ static inline void cpuidle_use_deepest_state(bool enable)
 
 /* kernel/sched/idle.c */
 extern void sched_idle_set_state(struct cpuidle_state *idle_state);
+extern struct cpuidle_state *sched_idle_get_state(int cpu);
 extern void default_idle_call(void);
 
 #ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED
diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index f5516ba..484825d 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -21,6 +21,17 @@ void sched_idle_set_state(struct cpuidle_state *idle_state)
 	idle_set_state(this_rq(), idle_state);
 }
 
+/**
+ * sched_idle_get_state - Get idle state for the specified CPU.
+ * @index: CPU index.
+ */
+
+struct cpuidle_state *sched_idle_get_state(int cpu)
+{
+	return idle_get_state(cpu_rq(cpu));
+}
+
+
 static int __read_mostly cpu_idle_force_poll;
 
 void cpu_idle_poll_ctrl(bool enable)
-- 
2.7.4