linux-kernel - [RFC 6/7] cpuidle-arm: Add arm64 wake helper for cpu

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Date:   Wed, 27 Mar 2019 13:21:16 +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 6/7] cpuidle-arm: Add arm64 wake helper for cpu_poke op

When the arm_poke_idle_state gets called, the poking
cpu_ops of the current core gets called, passing on the
the index of the core to be poked.

Signed-off-by: Abel Vesa <abel.vesa@....com>
---
 arch/arm64/include/asm/cpuidle.h | 6 ++++++
 arch/arm64/kernel/cpuidle.c      | 8 ++++++++
 drivers/cpuidle/cpuidle-arm.c    | 2 +-
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/cpuidle.h b/arch/arm64/include/asm/cpuidle.h
index 3c5ddb4..e637d4d 100644
--- a/arch/arm64/include/asm/cpuidle.h
+++ b/arch/arm64/include/asm/cpuidle.h
@@ -7,6 +7,7 @@
 #ifdef CONFIG_CPU_IDLE
 extern int arm_cpuidle_init(unsigned int cpu);
 extern int arm_cpuidle_suspend(int index);
+extern int arm_cpuidle_wake(int index);
 #else
 static inline int arm_cpuidle_init(unsigned int cpu)
 {
@@ -17,5 +18,10 @@ static inline int arm_cpuidle_suspend(int index)
 {
 	return -EOPNOTSUPP;
 }
+
+static inline int arm_cpuidle_wake(int index)
+{
+	return -EOPNOTSUPP;
+}
 #endif
 #endif
diff --git a/arch/arm64/kernel/cpuidle.c b/arch/arm64/kernel/cpuidle.c
index f2d1381..af00955 100644
--- a/arch/arm64/kernel/cpuidle.c
+++ b/arch/arm64/kernel/cpuidle.c
@@ -43,6 +43,14 @@ int arm_cpuidle_suspend(int index)
 	return cpu_ops[cpu]->cpu_suspend(index);
 }
 
+int arm_cpuidle_wake(int index)
+{
+	int cpu = smp_processor_id();
+
+	return cpu_ops[cpu]->cpu_poke(index);
+}
+
+
 #ifdef CONFIG_ACPI
 
 #include <acpi/processor.h>
diff --git a/drivers/cpuidle/cpuidle-arm.c b/drivers/cpuidle/cpuidle-arm.c
index 76ee7ac..d5d3eef 100644
--- a/drivers/cpuidle/cpuidle-arm.c
+++ b/drivers/cpuidle/cpuidle-arm.c
@@ -48,7 +48,7 @@ static int arm_enter_idle_state(struct cpuidle_device *dev,
 static int arm_poke_idle_state(struct cpuidle_device *dev,
 				struct cpuidle_driver *drv, int cpu)
 {
-	return 0;
+	return arm_cpuidle_wake(cpu);
 }
 
 static struct cpuidle_driver arm_idle_driver __initdata = {
-- 
2.7.4