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thermal/x86_pkg_temp: Make pkg_temp_lock a raw_spinlock_t

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The pkg_temp_lock spinlock is acquired in the thermal vector handler which
is truly atomic context even on PREEMPT_RT kernels.

The critical sections are tiny, so change it to a raw spinlock.

Signed-off-by: Clark Williams <williams@redhat.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20191008110021.2j44ayunal7fkb7i@linutronix.de
This commit is contained in:
Clark Williams 2019-10-08 13:00:21 +02:00 committed by Thomas Gleixner
parent 51e69e6551
commit fc32150e6f
1 changed files with 12 additions and 12 deletions
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24
drivers/thermal/intel/x86_pkg_temp_thermal.c
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@ -63,7 +63,7 @@ static int max_id __read_mostly;
/* Array of zone pointers */
static struct zone_device **zones;
/* Serializes interrupt notification, work and hotplug */
static DEFINE_SPINLOCK(pkg_temp_lock);
static DEFINE_RAW_SPINLOCK(pkg_temp_lock);
/* Protects zone operation in the work function against hotplug removal */
static DEFINE_MUTEX(thermal_zone_mutex);
@ -266,12 +266,12 @@ static void pkg_temp_thermal_threshold_work_fn(struct work_struct *work)
u64 msr_val, wr_val;
mutex_lock(&thermal_zone_mutex);
spin_lock_irq(&pkg_temp_lock);
raw_spin_lock_irq(&pkg_temp_lock);
++pkg_work_cnt;
zonedev = pkg_temp_thermal_get_dev(cpu);
if (!zonedev) {
spin_unlock_irq(&pkg_temp_lock);
raw_spin_unlock_irq(&pkg_temp_lock);
mutex_unlock(&thermal_zone_mutex);
return;
}
@ -285,7 +285,7 @@ static void pkg_temp_thermal_threshold_work_fn(struct work_struct *work)
}
enable_pkg_thres_interrupt();
spin_unlock_irq(&pkg_temp_lock);
raw_spin_unlock_irq(&pkg_temp_lock);
/*
* If tzone is not NULL, then thermal_zone_mutex will prevent the
@ -310,7 +310,7 @@ static int pkg_thermal_notify(u64 msr_val)
struct zone_device *zonedev;
unsigned long flags;
spin_lock_irqsave(&pkg_temp_lock, flags);
raw_spin_lock_irqsave(&pkg_temp_lock, flags);
++pkg_interrupt_cnt;
disable_pkg_thres_interrupt();
@ -322,7 +322,7 @@ static int pkg_thermal_notify(u64 msr_val)
pkg_thermal_schedule_work(zonedev->cpu, &zonedev->work);
}
spin_unlock_irqrestore(&pkg_temp_lock, flags);
raw_spin_unlock_irqrestore(&pkg_temp_lock, flags);
return 0;
}
@ -368,9 +368,9 @@ static int pkg_temp_thermal_device_add(unsigned int cpu)
zonedev->msr_pkg_therm_high);
cpumask_set_cpu(cpu, &zonedev->cpumask);
spin_lock_irq(&pkg_temp_lock);
raw_spin_lock_irq(&pkg_temp_lock);
zones[id] = zonedev;
spin_unlock_irq(&pkg_temp_lock);
raw_spin_unlock_irq(&pkg_temp_lock);
return 0;
}
@ -407,7 +407,7 @@ static int pkg_thermal_cpu_offline(unsigned int cpu)
}
/* Protect against work and interrupts */
spin_lock_irq(&pkg_temp_lock);
raw_spin_lock_irq(&pkg_temp_lock);
/*
* Check whether this cpu was the current target and store the new
@ -439,9 +439,9 @@ static int pkg_thermal_cpu_offline(unsigned int cpu)
* To cancel the work we need to drop the lock, otherwise
* we might deadlock if the work needs to be flushed.
*/
spin_unlock_irq(&pkg_temp_lock);
raw_spin_unlock_irq(&pkg_temp_lock);
cancel_delayed_work_sync(&zonedev->work);
spin_lock_irq(&pkg_temp_lock);
raw_spin_lock_irq(&pkg_temp_lock);
/*
* If this is not the last cpu in the package and the work
* did not run after we dropped the lock above, then we
@ -452,7 +452,7 @@ static int pkg_thermal_cpu_offline(unsigned int cpu)
pkg_thermal_schedule_work(target, &zonedev->work);
}
spin_unlock_irq(&pkg_temp_lock);
raw_spin_unlock_irq(&pkg_temp_lock);
/* Final cleanup if this is the last cpu */
if (lastcpu)