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 v6.6.y] Signed-off-by: Uwe Kleine-König ukleinek@debian.org --- drivers/cpufreq/intel_pstate.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 0ee3a04bb102..8a4fdf212ce0 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -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();