6.11-stable review patch. If anyone has any objections, please let me know.
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From: Uwe Kleine-König ukleinek@debian.org
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/cpufreq/intel_pstate.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-)
--- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -1623,7 +1623,7 @@ static void intel_pstate_notify_work(str 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;
#define HWP_GUARANTEED_PERF_CHANGE_STATUS BIT(0) @@ -1646,7 +1646,7 @@ void notify_hwp_interrupt(void) if (!(value & status_mask)) 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; @@ -1654,13 +1654,13 @@ 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) @@ -1673,9 +1673,9 @@ static void intel_pstate_disable_hwp_int /* 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); @@ -1690,10 +1690,10 @@ static void intel_pstate_enable_hwp_inte if (boot_cpu_has(X86_FEATURE_HWP_NOTIFY)) { u64 interrupt_mask = HWP_GUARANTEED_PERF_CHANGE_REQ;
- 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);
if (cpu_feature_enabled(X86_FEATURE_HWP_HIGHEST_PERF_CHANGE)) interrupt_mask |= HWP_HIGHEST_PERF_CHANGE_REQ;