cpufreq: intel_pstate: Make hwp_notify_lock a raw spinlock
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>
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@ -1845,7 +1845,7 @@ static void intel_pstate_notify_work(struct work_struct *work)
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wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_STATUS, 0);
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wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_STATUS, 0);
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}
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}
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static DEFINE_SPINLOCK(hwp_notify_lock);
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static DEFINE_RAW_SPINLOCK(hwp_notify_lock);
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static cpumask_t hwp_intr_enable_mask;
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static cpumask_t hwp_intr_enable_mask;
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#define HWP_GUARANTEED_PERF_CHANGE_STATUS BIT(0)
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#define HWP_GUARANTEED_PERF_CHANGE_STATUS BIT(0)
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@ -1868,7 +1868,7 @@ void notify_hwp_interrupt(void)
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if (!(value & status_mask))
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if (!(value & status_mask))
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return;
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return;
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spin_lock_irqsave(&hwp_notify_lock, flags);
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raw_spin_lock_irqsave(&hwp_notify_lock, flags);
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if (!cpumask_test_cpu(this_cpu, &hwp_intr_enable_mask))
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if (!cpumask_test_cpu(this_cpu, &hwp_intr_enable_mask))
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goto ack_intr;
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goto ack_intr;
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@ -1876,13 +1876,13 @@ void notify_hwp_interrupt(void)
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schedule_delayed_work(&all_cpu_data[this_cpu]->hwp_notify_work,
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schedule_delayed_work(&all_cpu_data[this_cpu]->hwp_notify_work,
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msecs_to_jiffies(10));
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msecs_to_jiffies(10));
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spin_unlock_irqrestore(&hwp_notify_lock, flags);
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raw_spin_unlock_irqrestore(&hwp_notify_lock, flags);
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return;
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return;
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ack_intr:
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ack_intr:
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wrmsrl_safe(MSR_HWP_STATUS, 0);
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wrmsrl_safe(MSR_HWP_STATUS, 0);
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spin_unlock_irqrestore(&hwp_notify_lock, flags);
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raw_spin_unlock_irqrestore(&hwp_notify_lock, flags);
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}
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}
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static void intel_pstate_disable_hwp_interrupt(struct cpudata *cpudata)
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static void intel_pstate_disable_hwp_interrupt(struct cpudata *cpudata)
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@ -1895,9 +1895,9 @@ static void intel_pstate_disable_hwp_interrupt(struct cpudata *cpudata)
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/* wrmsrl_on_cpu has to be outside spinlock as this can result in IPC */
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/* wrmsrl_on_cpu has to be outside spinlock as this can result in IPC */
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wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00);
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wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00);
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spin_lock_irq(&hwp_notify_lock);
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raw_spin_lock_irq(&hwp_notify_lock);
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cancel_work = cpumask_test_and_clear_cpu(cpudata->cpu, &hwp_intr_enable_mask);
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cancel_work = cpumask_test_and_clear_cpu(cpudata->cpu, &hwp_intr_enable_mask);
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spin_unlock_irq(&hwp_notify_lock);
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raw_spin_unlock_irq(&hwp_notify_lock);
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if (cancel_work)
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if (cancel_work)
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cancel_delayed_work_sync(&cpudata->hwp_notify_work);
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cancel_delayed_work_sync(&cpudata->hwp_notify_work);
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@ -1912,10 +1912,10 @@ static void intel_pstate_enable_hwp_interrupt(struct cpudata *cpudata)
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if (boot_cpu_has(X86_FEATURE_HWP_NOTIFY)) {
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if (boot_cpu_has(X86_FEATURE_HWP_NOTIFY)) {
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u64 interrupt_mask = HWP_GUARANTEED_PERF_CHANGE_REQ;
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u64 interrupt_mask = HWP_GUARANTEED_PERF_CHANGE_REQ;
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spin_lock_irq(&hwp_notify_lock);
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raw_spin_lock_irq(&hwp_notify_lock);
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INIT_DELAYED_WORK(&cpudata->hwp_notify_work, intel_pstate_notify_work);
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INIT_DELAYED_WORK(&cpudata->hwp_notify_work, intel_pstate_notify_work);
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cpumask_set_cpu(cpudata->cpu, &hwp_intr_enable_mask);
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cpumask_set_cpu(cpudata->cpu, &hwp_intr_enable_mask);
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spin_unlock_irq(&hwp_notify_lock);
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raw_spin_unlock_irq(&hwp_notify_lock);
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if (cpu_feature_enabled(X86_FEATURE_HWP_HIGHEST_PERF_CHANGE))
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if (cpu_feature_enabled(X86_FEATURE_HWP_HIGHEST_PERF_CHANGE))
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interrupt_mask |= HWP_HIGHEST_PERF_CHANGE_REQ;
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interrupt_mask |= HWP_HIGHEST_PERF_CHANGE_REQ;
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