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thermal/x86 pkg temp: Convert to hotplug state machine

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Install the callbacks via the state machine and let the core invoke
the callbacks on the already online CPUs.

Replace the wrmsr/rdmrs_on_cpu() calls in the hotplug callbacks as they are
guaranteed to be invoked on the incoming/outgoing cpu.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
This commit is contained in:
Sebastian Andrzej Siewior 2016-11-22 17:57:15 +00:00 committed by Zhang Rui
parent 556238e45c
commit 7646ff2e7a
1 changed files with 23 additions and 57 deletions
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80
drivers/thermal/x86_pkg_temp_thermal.c
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@ -79,6 +79,9 @@ static DEFINE_SPINLOCK(pkg_temp_lock);
/* Protects zone operation in the work function against hotplug removal */
static DEFINE_MUTEX(thermal_zone_mutex);
/* The dynamically assigned cpu hotplug state for module_exit() */
static enum cpuhp_state pkg_thermal_hp_state __read_mostly;
/* Debug counters to show using debugfs */
static struct dentry *debugfs;
static unsigned int pkg_interrupt_cnt;
@ -386,9 +389,8 @@ static int pkg_temp_thermal_device_add(unsigned int cpu)
return err;
}
/* Store MSR value for package thermal interrupt, to restore at exit */
rdmsr_on_cpu(cpu, MSR_IA32_PACKAGE_THERM_INTERRUPT,
&pkgdev->msr_pkg_therm_low,
&pkgdev->msr_pkg_therm_high);
rdmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, pkgdev->msr_pkg_therm_low,
pkgdev->msr_pkg_therm_high);
cpumask_set_cpu(cpu, &pkgdev->cpumask);
spin_lock_irq(&pkg_temp_lock);
@ -397,14 +399,14 @@ static int pkg_temp_thermal_device_add(unsigned int cpu)
return 0;
}
static void put_core_offline(unsigned int cpu)
static int pkg_thermal_cpu_offline(unsigned int cpu)
{
struct pkg_device *pkgdev = pkg_temp_thermal_get_dev(cpu);
bool lastcpu, was_target;
int target;
if (!pkgdev)
return;
return 0;
target = cpumask_any_but(&pkgdev->cpumask, cpu);
cpumask_clear_cpu(cpu, &pkgdev->cpumask);
@ -448,16 +450,9 @@ static void put_core_offline(unsigned int cpu)
*/
if (lastcpu) {
packages[topology_logical_package_id(cpu)] = NULL;
/*
* After this point nothing touches the MSR anymore. We
* must drop the lock to make the cross cpu call. This goes
* away once we move that code to the hotplug state machine.
*/
spin_unlock_irq(&pkg_temp_lock);
wrmsr_on_cpu(cpu, MSR_IA32_PACKAGE_THERM_INTERRUPT,
pkgdev->msr_pkg_therm_low,
pkgdev->msr_pkg_therm_high);
spin_lock_irq(&pkg_temp_lock);
/* After this point nothing touches the MSR anymore. */
wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT,
pkgdev->msr_pkg_therm_low, pkgdev->msr_pkg_therm_high);
}
/*
@ -487,9 +482,10 @@ static void put_core_offline(unsigned int cpu)
/* Final cleanup if this is the last cpu */
if (lastcpu)
kfree(pkgdev);
return 0;
}
static int get_core_online(unsigned int cpu)
static int pkg_thermal_cpu_online(unsigned int cpu)
{
struct pkg_device *pkgdev = pkg_temp_thermal_get_dev(cpu);
struct cpuinfo_x86 *c = &cpu_data(cpu);
@ -506,27 +502,6 @@ static int get_core_online(unsigned int cpu)
return pkg_temp_thermal_device_add(cpu);
}
static int pkg_temp_thermal_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:
get_core_online(cpu);
break;
case CPU_DOWN_PREPARE:
put_core_offline(cpu);
break;
}
return NOTIFY_OK;
}
static struct notifier_block pkg_temp_thermal_notifier __refdata = {
.notifier_call = pkg_temp_thermal_cpu_callback,
};
static const struct x86_cpu_id __initconst pkg_temp_thermal_ids[] = {
{ X86_VENDOR_INTEL, X86_FAMILY_ANY, X86_MODEL_ANY, X86_FEATURE_PTS },
{}
@ -535,7 +510,7 @@ MODULE_DEVICE_TABLE(x86cpu, pkg_temp_thermal_ids);
static int __init pkg_temp_thermal_init(void)
{
int i;
int ret;
if (!x86_match_cpu(pkg_temp_thermal_ids))
return -ENODEV;
@ -545,12 +520,13 @@ static int __init pkg_temp_thermal_init(void)
if (!packages)
return -ENOMEM;
cpu_notifier_register_begin();
for_each_online_cpu(i)
if (get_core_online(i))
goto err_ret;
__register_hotcpu_notifier(&pkg_temp_thermal_notifier);
cpu_notifier_register_done();
ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "thermal/x86_pkg:online",
pkg_thermal_cpu_online, pkg_thermal_cpu_offline);
if (ret < 0)
goto err;
/* Store the state for module exit */
pkg_thermal_hp_state = ret;
platform_thermal_package_notify = pkg_thermal_notify;
platform_thermal_package_rate_control = pkg_thermal_rate_control;
@ -559,28 +535,18 @@ static int __init pkg_temp_thermal_init(void)
pkg_temp_debugfs_init();
return 0;
err_ret:
for_each_online_cpu(i)
put_core_offline(i);
cpu_notifier_register_done();
err:
kfree(packages);
return -ENODEV;
return ret;
}
module_init(pkg_temp_thermal_init)
static void __exit pkg_temp_thermal_exit(void)
{
int i;
platform_thermal_package_notify = NULL;
platform_thermal_package_rate_control = NULL;
cpu_notifier_register_begin();
__unregister_hotcpu_notifier(&pkg_temp_thermal_notifier);
for_each_online_cpu(i)
put_core_offline(i);
cpu_notifier_register_done();
cpuhp_remove_state(pkg_thermal_hp_state);
debugfs_remove_recursive(debugfs);
kfree(packages);
}