corelockup: Add detector enable support by cmdline

ascend inclusion
category: feature
bugzilla: NA
CVE: NA

--------------------------------

Add cmdline params "enable_corelockup_detector" to support enable
core suspend detector. And enable defaultly within ascend features.
Signed-off-by: NDong Kai <dongkai11@huawei.com>
Reviewed-by: NKuohai Xu <xukuohai@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

arch/arm64/mm/init.c

@@ -771,6 +771,9 @@ __setup("keepinitrd", keepinitrd_setup);
 #ifdef CONFIG_ASCEND_FEATURES
 
 #include <linux/perf/arm_pmu.h>
+#ifdef CONFIG_CORELOCKUP_DETECTOR
+#include <linux/nmi.h>
+#endif
 
 void ascend_enable_all_features(void)
 {
@@ -797,6 +800,10 @@ void ascend_enable_all_features(void)
 #ifdef CONFIG_ARM64_PSEUDO_NMI
 	enable_pseudo_nmi = true;
 #endif
+
+#ifdef CONFIG_CORELOCKUP_DETECTOR
+	enable_corelockup_detector = true;
+#endif
 }
 
 static int __init ascend_enable_setup(char *__unused)

include/linux/nmi.h

@@ -111,6 +111,7 @@ extern void hardlockup_detector_perf_disable(void);
 extern void hardlockup_detector_perf_enable(void);
 extern void hardlockup_detector_perf_cleanup(void);
 extern int hardlockup_detector_perf_init(void);
+extern bool enable_corelockup_detector;
 #else
 static inline void hardlockup_detector_perf_stop(void) { }
 static inline void hardlockup_detector_perf_restart(void) { }

kernel/watchdog.c

@@ -384,7 +384,8 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
 
 #ifdef CONFIG_CORELOCKUP_DETECTOR
 	/* check hrtimer of detector cpu */
-	watchdog_check_hrtimer();
+	if (enable_corelockup_detector)
+		watchdog_check_hrtimer();
 #endif
 
 	/* kick the hardlockup detector */
@@ -575,7 +576,8 @@ int lockup_detector_online_cpu(unsigned int cpu)
 	if (cpumask_test_cpu(cpu, &watchdog_allowed_mask)) {
 		watchdog_enable(cpu);
 #ifdef CONFIG_CORELOCKUP_DETECTOR
-		corelockup_detector_online_cpu(cpu);
+		if (enable_corelockup_detector)
+			corelockup_detector_online_cpu(cpu);
 #endif
 	}
 	return 0;
@@ -586,7 +588,8 @@ int lockup_detector_offline_cpu(unsigned int cpu)
 	if (cpumask_test_cpu(cpu, &watchdog_allowed_mask)) {
 		watchdog_disable(cpu);
 #ifdef CONFIG_CORELOCKUP_DETECTOR
-		corelockup_detector_offline_cpu(cpu);
+		if (enable_corelockup_detector)
+			corelockup_detector_offline_cpu(cpu);
 #endif
 	}
 	return 0;
@@ -819,6 +822,7 @@ void __init lockup_detector_init(void)
 		nmi_watchdog_available = true;
 	lockup_detector_setup();
 #ifdef CONFIG_CORELOCKUP_DETECTOR
-	corelockup_detector_init();
+	if (enable_corelockup_detector)
+		corelockup_detector_init();
 #endif
 }

kernel/watchdog_hld.c

@@ -91,6 +91,14 @@ static DEFINE_PER_CPU(unsigned long, hrint_missed);
 struct cpumask corelockup_cpumask __read_mostly;
 unsigned int close_wfi_wfe;
 static bool pmu_based_nmi;
+bool enable_corelockup_detector;
+
+static int __init enable_corelockup_detector_setup(char *str)
+{
+	enable_corelockup_detector = true;
+	return 1;
+}
+__setup("enable_corelockup_detector", enable_corelockup_detector_setup);
 
 static void watchdog_nmi_interrupts(void)
 {
@@ -324,11 +332,13 @@ static inline bool watchdog_check_timestamp(void)
 void watchdog_hardlockup_check(struct pt_regs *regs)
 {
 #ifdef CONFIG_CORELOCKUP_DETECTOR
-	/* Kick nmi interrupts */
-	watchdog_nmi_interrupts();
+	if (enable_corelockup_detector) {
+		/* Kick nmi interrupts */
+		watchdog_nmi_interrupts();
 
-	/* corelockup check */
-	watchdog_corelockup_check(regs);
+		/* corelockup check */
+		watchdog_corelockup_check(regs);
+	}
 #endif
 
 	if (__this_cpu_read(watchdog_nmi_touch) == true) {