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cpufreq: intel_pstate: Make hwp_notify_lock a raw spinlock

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commit 8b4865cd90 upstream.

notify_hwp_interrupt() is called via sysvec_thermal() ->
smp_thermal_vector() -> intel_thermal_interrupt() in hard irq context.
For this reason it must not use a simple spin_lock that sleeps with
PREEMPT_RT enabled. So convert it to a raw spinlock.

Reported-by: xiao sheng wen <atzlinux@sina.com>
Link: https://bugs.debian.org/1076483
Signed-off-by: Uwe Kleine-König <ukleinek@debian.org>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: xiao sheng wen <atzlinux@sina.com>
Link: https://patch.msgid.link/20240919081121.10784-2-ukleinek@debian.org
Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
[ukleinek: Backport to v6.6.y]
Signed-off-by: Uwe Kleine-König <ukleinek@debian.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Uwe Kleine-König 2024-10-06 22:51:07 +02:00 committed by Greg Kroah-Hartman
parent 68d603f467
commit eebc10e924
1 changed files with 10 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/cpufreq/intel_pstate.c
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@ -1632,7 +1632,7 @@ static void intel_pstate_notify_work(struct work_struct *work)
wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_STATUS, 0);
}
static DEFINE_SPINLOCK(hwp_notify_lock);
static DEFINE_RAW_SPINLOCK(hwp_notify_lock);
static cpumask_t hwp_intr_enable_mask;
void notify_hwp_interrupt(void)
@ -1649,7 +1649,7 @@ void notify_hwp_interrupt(void)
if (!(value & 0x01))
return;
spin_lock_irqsave(&hwp_notify_lock, flags);
raw_spin_lock_irqsave(&hwp_notify_lock, flags);
if (!cpumask_test_cpu(this_cpu, &hwp_intr_enable_mask))
goto ack_intr;
@ -1673,13 +1673,13 @@ void notify_hwp_interrupt(void)
schedule_delayed_work(&cpudata->hwp_notify_work, msecs_to_jiffies(10));
spin_unlock_irqrestore(&hwp_notify_lock, flags);
raw_spin_unlock_irqrestore(&hwp_notify_lock, flags);
return;
ack_intr:
wrmsrl_safe(MSR_HWP_STATUS, 0);
spin_unlock_irqrestore(&hwp_notify_lock, flags);
raw_spin_unlock_irqrestore(&hwp_notify_lock, flags);
}
static void intel_pstate_disable_hwp_interrupt(struct cpudata *cpudata)
@ -1692,10 +1692,10 @@ static void intel_pstate_disable_hwp_interrupt(struct cpudata *cpudata)
/* wrmsrl_on_cpu has to be outside spinlock as this can result in IPC */
wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00);
spin_lock_irqsave(&hwp_notify_lock, flags);
raw_spin_lock_irqsave(&hwp_notify_lock, flags);
if (cpumask_test_and_clear_cpu(cpudata->cpu, &hwp_intr_enable_mask))
cancel_delayed_work(&cpudata->hwp_notify_work);
spin_unlock_irqrestore(&hwp_notify_lock, flags);
raw_spin_unlock_irqrestore(&hwp_notify_lock, flags);
}
static void intel_pstate_enable_hwp_interrupt(struct cpudata *cpudata)
@ -1704,10 +1704,10 @@ static void intel_pstate_enable_hwp_interrupt(struct cpudata *cpudata)
if (boot_cpu_has(X86_FEATURE_HWP_NOTIFY)) {
unsigned long flags;
spin_lock_irqsave(&hwp_notify_lock, flags);
raw_spin_lock_irqsave(&hwp_notify_lock, flags);
INIT_DELAYED_WORK(&cpudata->hwp_notify_work, intel_pstate_notify_work);
cpumask_set_cpu(cpudata->cpu, &hwp_intr_enable_mask);
spin_unlock_irqrestore(&hwp_notify_lock, flags);
raw_spin_unlock_irqrestore(&hwp_notify_lock, flags);
/* wrmsrl_on_cpu has to be outside spinlock as this can result in IPC */
wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x01);
@ -3136,10 +3136,10 @@ static void intel_pstate_driver_cleanup(void)
if (intel_pstate_driver == &intel_pstate)
intel_pstate_clear_update_util_hook(cpu);
spin_lock(&hwp_notify_lock);
raw_spin_lock(&hwp_notify_lock);
kfree(all_cpu_data[cpu]);
WRITE_ONCE(all_cpu_data[cpu], NULL);
spin_unlock(&hwp_notify_lock);
raw_spin_unlock(&hwp_notify_lock);
}
}
cpus_read_unlock();