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Message-Id: <20160906170457.32393-13-bigeasy@linutronix.de>
Date: Tue, 6 Sep 2016 19:04:48 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: linux-kernel@...r.kernel.org
Cc: Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>, rt@...utronix.de,
tglx@...utronix.de,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Viresh Kumar <viresh.kumar@...aro.org>,
linux-pm@...r.kernel.org
Subject: [PATCH 12/21] cpufreq: Convert to hotplug state machine
Install the callbacks via the state machine.
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Viresh Kumar <viresh.kumar@...aro.org>
Cc: linux-pm@...r.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
drivers/cpufreq/cpufreq.c | 38 ++++++++++++--------------------------
1 file changed, 12 insertions(+), 26 deletions(-)
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 3dd4884c6f9e..e0bc632a259e 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1358,7 +1358,7 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
return add_cpu_dev_symlink(policy, cpu);
}
-static void cpufreq_offline(unsigned int cpu)
+static int cpufreq_offline(unsigned int cpu)
{
struct cpufreq_policy *policy;
int ret;
@@ -1368,7 +1368,7 @@ static void cpufreq_offline(unsigned int cpu)
policy = cpufreq_cpu_get_raw(cpu);
if (!policy) {
pr_debug("%s: No cpu_data found\n", __func__);
- return;
+ return 0;
}
down_write(&policy->rwsem);
@@ -1417,6 +1417,7 @@ static void cpufreq_offline(unsigned int cpu)
unlock:
up_write(&policy->rwsem);
+ return 0;
}
/**
@@ -2332,28 +2333,6 @@ int cpufreq_update_policy(unsigned int cpu)
}
EXPORT_SYMBOL(cpufreq_update_policy);
-static int cpufreq_cpu_callback(struct notifier_block *nfb,
- unsigned long action, void *hcpu)
-{
- unsigned int cpu = (unsigned long)hcpu;
-
- switch (action & ~CPU_TASKS_FROZEN) {
- case CPU_ONLINE:
- case CPU_DOWN_FAILED:
- cpufreq_online(cpu);
- break;
-
- case CPU_DOWN_PREPARE:
- cpufreq_offline(cpu);
- break;
- }
- return NOTIFY_OK;
-}
-
-static struct notifier_block __refdata cpufreq_cpu_notifier = {
- .notifier_call = cpufreq_cpu_callback,
-};
-
/*********************************************************************
* BOOST *
*********************************************************************/
@@ -2455,6 +2434,7 @@ EXPORT_SYMBOL_GPL(cpufreq_boost_enabled);
/*********************************************************************
* REGISTER / UNREGISTER CPUFREQ DRIVER *
*********************************************************************/
+static enum cpuhp_state hp_online;
/**
* cpufreq_register_driver - register a CPU Frequency driver
@@ -2517,7 +2497,13 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data)
goto err_if_unreg;
}
- register_hotcpu_notifier(&cpufreq_cpu_notifier);
+ ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "cpufreq:online",
+ cpufreq_online,
+ cpufreq_offline);
+ if (ret < 0)
+ goto err_if_unreg;
+ hp_online = ret;
+
pr_debug("driver %s up and running\n", driver_data->name);
goto out;
@@ -2556,7 +2542,7 @@ int cpufreq_unregister_driver(struct cpufreq_driver *driver)
get_online_cpus();
subsys_interface_unregister(&cpufreq_interface);
remove_boost_sysfs_file();
- unregister_hotcpu_notifier(&cpufreq_cpu_notifier);
+ cpuhp_remove_state_nocalls(hp_online);
write_lock_irqsave(&cpufreq_driver_lock, flags);
--
2.9.3
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