commit 8b4865cd904650cbed7f2407e653934c621b8127 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 v6.10.y] Signed-off-by: Uwe Kleine-König ukleinek@debian.org --- drivers/cpufreq/intel_pstate.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index c31914a9876f..b694e474acec 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -1622,7 +1622,7 @@ 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) @@ -1638,7 +1638,7 @@ 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; @@ -1646,13 +1646,13 @@ void notify_hwp_interrupt(void) schedule_delayed_work(&all_cpu_data[this_cpu]->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) @@ -1665,9 +1665,9 @@ 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_irq(&hwp_notify_lock); + raw_spin_lock_irq(&hwp_notify_lock); cancel_work = cpumask_test_and_clear_cpu(cpudata->cpu, &hwp_intr_enable_mask); - spin_unlock_irq(&hwp_notify_lock); + raw_spin_unlock_irq(&hwp_notify_lock);
if (cancel_work) cancel_delayed_work_sync(&cpudata->hwp_notify_work); @@ -1677,10 +1677,10 @@ static void intel_pstate_enable_hwp_interrupt(struct cpudata *cpudata) { /* Enable HWP notification interrupt for guaranteed performance change */ if (boot_cpu_has(X86_FEATURE_HWP_NOTIFY)) { - spin_lock_irq(&hwp_notify_lock); + raw_spin_lock_irq(&hwp_notify_lock); INIT_DELAYED_WORK(&cpudata->hwp_notify_work, intel_pstate_notify_work); cpumask_set_cpu(cpudata->cpu, &hwp_intr_enable_mask); - spin_unlock_irq(&hwp_notify_lock); + raw_spin_unlock_irq(&hwp_notify_lock);
/* wrmsrl_on_cpu has to be outside spinlock as this can result in IPC */ wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x01);