[PATCH] Add SMP support on x86_64 to reservation framework (f2802e7f) · Commits · e / devices / android_kernel_teracube_2e

arch/x86_64/kernel/apic.c

+1 −2

Original line number	Original line	Diff line number	Diff line
	@@ -479,8 +479,7 @@ void __cpuinit setup_local_APIC (void)
	}		}

	nmi_watchdog_default();		nmi_watchdog_default();
	if (nmi_watchdog == NMI_LOCAL_APIC)		setup_apic_nmi_watchdog(NULL);
	setup_apic_nmi_watchdog();
	apic_pm_activate();		apic_pm_activate();
	}		}

arch/x86_64/kernel/nmi.c

+287 −139

Original line number	Original line	Diff line number	Diff line
	@@ -56,53 +56,29 @@ static unsigned int lapic_nmi_owner;
	#define LAPIC_NMI_RESERVED (1<<1)		#define LAPIC_NMI_RESERVED (1<<1)

	/* nmi_active:		/* nmi_active:
	* +1: the lapic NMI watchdog is active, but can be disabled		* >0: the lapic NMI watchdog is active, but can be disabled
	* 0: the lapic NMI watchdog has not been set up, and cannot		* <0: the lapic NMI watchdog has not been set up, and cannot
	* be enabled		* be enabled
	* -1: the lapic NMI watchdog is disabled, but can be enabled		* 0: the lapic NMI watchdog is disabled, but can be enabled
	*/		*/
	int nmi_active; /* oprofile uses this */		atomic_t nmi_active = ATOMIC_INIT(0); /* oprofile uses this */
	int panic_on_timeout;		int panic_on_timeout;

	unsigned int nmi_watchdog = NMI_DEFAULT;		unsigned int nmi_watchdog = NMI_DEFAULT;
	static unsigned int nmi_hz = HZ;		static unsigned int nmi_hz = HZ;
	static unsigned int nmi_perfctr_msr; /* the MSR to reset in NMI handler */
	static unsigned int nmi_p4_cccr_val;

	/* Note that these events don't tick when the CPU idles. This means		struct nmi_watchdog_ctlblk {
	the frequency varies with CPU load. */		int enabled;
			u64 check_bit;
			unsigned int cccr_msr;
			unsigned int perfctr_msr; /* the MSR to reset in NMI handler */
			unsigned int evntsel_msr; /* the MSR to select the events to handle */
			};
			static DEFINE_PER_CPU(struct nmi_watchdog_ctlblk, nmi_watchdog_ctlblk);

	#define K7_EVNTSEL_ENABLE (1 << 22)		/* local prototypes */
	#define K7_EVNTSEL_INT (1 << 20)		static void stop_apic_nmi_watchdog(void *unused);
	#define K7_EVNTSEL_OS (1 << 17)		static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu);
	#define K7_EVNTSEL_USR (1 << 16)
	#define K7_EVENT_CYCLES_PROCESSOR_IS_RUNNING 0x76
	#define K7_NMI_EVENT K7_EVENT_CYCLES_PROCESSOR_IS_RUNNING

	#define MSR_P4_MISC_ENABLE 0x1A0
	#define MSR_P4_MISC_ENABLE_PERF_AVAIL (1<<7)
	#define MSR_P4_MISC_ENABLE_PEBS_UNAVAIL (1<<12)
	#define MSR_P4_PERFCTR0 0x300
	#define MSR_P4_CCCR0 0x360
	#define P4_ESCR_EVENT_SELECT(N) ((N)<<25)
	#define P4_ESCR_OS (1<<3)
	#define P4_ESCR_USR (1<<2)
	#define P4_CCCR_OVF_PMI0 (1<<26)
	#define P4_CCCR_OVF_PMI1 (1<<27)
	#define P4_CCCR_THRESHOLD(N) ((N)<<20)
	#define P4_CCCR_COMPLEMENT (1<<19)
	#define P4_CCCR_COMPARE (1<<18)
	#define P4_CCCR_REQUIRED (3<<16)
	#define P4_CCCR_ESCR_SELECT(N) ((N)<<13)
	#define P4_CCCR_ENABLE (1<<12)
	/* Set up IQ_COUNTER0 to behave like a clock, by having IQ_CCCR0 filter
	CRU_ESCR0 (with any non-null event selector) through a complemented
	max threshold. [IA32-Vol3, Section 14.9.9] */
	#define MSR_P4_IQ_COUNTER0 0x30C
	#define P4_NMI_CRU_ESCR0 (P4_ESCR_EVENT_SELECT(0x3F)\|P4_ESCR_OS\|P4_ESCR_USR)
	#define P4_NMI_IQ_CCCR0 \
	(P4_CCCR_OVF_PMI0\|P4_CCCR_THRESHOLD(15)\|P4_CCCR_COMPLEMENT\| \
	P4_CCCR_COMPARE\|P4_CCCR_REQUIRED\|P4_CCCR_ESCR_SELECT(4)\|P4_CCCR_ENABLE)

	/* converts an msr to an appropriate reservation bit */		/* converts an msr to an appropriate reservation bit */
	static inline unsigned int nmi_perfctr_msr_to_bit(unsigned int msr)		static inline unsigned int nmi_perfctr_msr_to_bit(unsigned int msr)
	@@ -241,6 +217,12 @@ int __init check_nmi_watchdog (void)
	int *counts;		int *counts;
	int cpu;		int cpu;

			if ((nmi_watchdog == NMI_NONE) \|\| (nmi_watchdog == NMI_DEFAULT))
			return 0;

			if (!atomic_read(&nmi_active))
			return 0;

	counts = kmalloc(NR_CPUS * sizeof(int), GFP_KERNEL);		counts = kmalloc(NR_CPUS * sizeof(int), GFP_KERNEL);
	if (!counts)		if (!counts)
	return -1;		return -1;
	@@ -258,19 +240,22 @@ int __init check_nmi_watchdog (void)
	mdelay((10*1000)/nmi_hz); // wait 10 ticks		mdelay((10*1000)/nmi_hz); // wait 10 ticks

	for_each_online_cpu(cpu) {		for_each_online_cpu(cpu) {
			if (!per_cpu(nmi_watchdog_ctlblk, cpu).enabled)
			continue;
	if (cpu_pda(cpu)->__nmi_count - counts[cpu] <= 5) {		if (cpu_pda(cpu)->__nmi_count - counts[cpu] <= 5) {
	endflag = 1;
	printk("CPU#%d: NMI appears to be stuck (%d->%d)!\n",		printk("CPU#%d: NMI appears to be stuck (%d->%d)!\n",
	cpu,		cpu,
	counts[cpu],		counts[cpu],
	cpu_pda(cpu)->__nmi_count);		cpu_pda(cpu)->__nmi_count);
	nmi_active = 0;		per_cpu(nmi_watchdog_ctlblk, cpu).enabled = 0;
	lapic_nmi_owner &= ~LAPIC_NMI_WATCHDOG;		atomic_dec(&nmi_active);
	nmi_perfctr_msr = 0;		}
			}
			if (!atomic_read(&nmi_active)) {
	kfree(counts);		kfree(counts);
			atomic_set(&nmi_active, -1);
	return -1;		return -1;
	}		}
	}
	endflag = 1;		endflag = 1;
	printk("OK.\n");		printk("OK.\n");

	@@ -297,8 +282,11 @@ int __init setup_nmi_watchdog(char *str)

	get_option(&str, &nmi);		get_option(&str, &nmi);

	if (nmi >= NMI_INVALID)		if ((nmi >= NMI_INVALID) \|\| (nmi < NMI_NONE))
	return 0;		return 0;

			if ((nmi == NMI_LOCAL_APIC) && (nmi_known_cpu() == 0))
			return 0; /* no lapic support */
	nmi_watchdog = nmi;		nmi_watchdog = nmi;
	return 1;		return 1;
	}		}
	@@ -307,31 +295,30 @@ __setup("nmi_watchdog=", setup_nmi_watchdog);

	static void disable_lapic_nmi_watchdog(void)		static void disable_lapic_nmi_watchdog(void)
	{		{
	if (nmi_active <= 0)		BUG_ON(nmi_watchdog != NMI_LOCAL_APIC);

			if (atomic_read(&nmi_active) <= 0)
	return;		return;
	switch (boot_cpu_data.x86_vendor) {
	case X86_VENDOR_AMD:		on_each_cpu(stop_apic_nmi_watchdog, NULL, 0, 1);
	wrmsr(MSR_K7_EVNTSEL0, 0, 0);
	break;		BUG_ON(atomic_read(&nmi_active) != 0);
	case X86_VENDOR_INTEL:
	if (boot_cpu_data.x86 == 15) {
	wrmsr(MSR_P4_IQ_CCCR0, 0, 0);
	wrmsr(MSR_P4_CRU_ESCR0, 0, 0);
	}
	break;
	}
	nmi_active = -1;
	/* tell do_nmi() and others that we're not active any more */
	nmi_watchdog = 0;
	}		}

	static void enable_lapic_nmi_watchdog(void)		static void enable_lapic_nmi_watchdog(void)
	{		{
	if (nmi_active < 0) {		BUG_ON(nmi_watchdog != NMI_LOCAL_APIC);
	nmi_watchdog = NMI_LOCAL_APIC;
			/* are we already enabled */
			if (atomic_read(&nmi_active) != 0)
			return;

			/* are we lapic aware */
			if (nmi_known_cpu() <= 0)
			return;

			on_each_cpu(setup_apic_nmi_watchdog, NULL, 0, 1);
	touch_nmi_watchdog();		touch_nmi_watchdog();
	setup_apic_nmi_watchdog();
	}
	}		}

	int reserve_lapic_nmi(void)		int reserve_lapic_nmi(void)
	@@ -363,21 +350,24 @@ void release_lapic_nmi(void)

	void disable_timer_nmi_watchdog(void)		void disable_timer_nmi_watchdog(void)
	{		{
	if ((nmi_watchdog != NMI_IO_APIC) \|\| (nmi_active <= 0))		BUG_ON(nmi_watchdog != NMI_IO_APIC);

			if (atomic_read(&nmi_active) <= 0)
	return;		return;

	disable_irq(0);		disable_irq(0);
	unset_nmi_callback();		on_each_cpu(stop_apic_nmi_watchdog, NULL, 0, 1);
	nmi_active = -1;
	nmi_watchdog = NMI_NONE;		BUG_ON(atomic_read(&nmi_active) != 0);
	}		}

	void enable_timer_nmi_watchdog(void)		void enable_timer_nmi_watchdog(void)
	{		{
	if (nmi_active < 0) {		BUG_ON(nmi_watchdog != NMI_IO_APIC);
	nmi_watchdog = NMI_IO_APIC;
			if (atomic_read(&nmi_active) == 0) {
	touch_nmi_watchdog();		touch_nmi_watchdog();
	nmi_active = 1;		on_each_cpu(setup_apic_nmi_watchdog, NULL, 0, 1);
	enable_irq(0);		enable_irq(0);
	}		}
	}		}
	@@ -388,7 +378,7 @@ static int nmi_pm_active; /* nmi_active before suspend */

	static int lapic_nmi_suspend(struct sys_device *dev, pm_message_t state)		static int lapic_nmi_suspend(struct sys_device *dev, pm_message_t state)
	{		{
	nmi_pm_active = nmi_active;		nmi_pm_active = atomic_read(&nmi_active);
	disable_lapic_nmi_watchdog();		disable_lapic_nmi_watchdog();
	return 0;		return 0;
	}		}
	@@ -415,7 +405,13 @@ static int __init init_lapic_nmi_sysfs(void)
	{		{
	int error;		int error;

	if (nmi_active == 0 \|\| nmi_watchdog != NMI_LOCAL_APIC)		/* should really be a BUG_ON but b/c this is an
			* init call, it just doesn't work. -dcz
			*/
			if (nmi_watchdog != NMI_LOCAL_APIC)
			return 0;

			if ( atomic_read(&nmi_active) < 0 )
	return 0;		return 0;

	error = sysdev_class_register(&nmi_sysclass);		error = sysdev_class_register(&nmi_sysclass);
	@@ -428,100 +424,232 @@ late_initcall(init_lapic_nmi_sysfs);

	#endif /* CONFIG_PM */		#endif /* CONFIG_PM */

			/*
			* Activate the NMI watchdog via the local APIC.
			* Original code written by Keith Owens.
			*/

			/* Note that these events don't tick when the CPU idles. This means
			the frequency varies with CPU load. */

			#define K7_EVNTSEL_ENABLE (1 << 22)
			#define K7_EVNTSEL_INT (1 << 20)
			#define K7_EVNTSEL_OS (1 << 17)
			#define K7_EVNTSEL_USR (1 << 16)
			#define K7_EVENT_CYCLES_PROCESSOR_IS_RUNNING 0x76
			#define K7_NMI_EVENT K7_EVENT_CYCLES_PROCESSOR_IS_RUNNING

	static int setup_k7_watchdog(void)		static int setup_k7_watchdog(void)
	{		{
			unsigned int perfctr_msr, evntsel_msr;
	unsigned int evntsel;		unsigned int evntsel;
			struct nmi_watchdog_ctlblk *wd = &__get_cpu_var(nmi_watchdog_ctlblk);

	nmi_perfctr_msr = MSR_K7_PERFCTR0;		perfctr_msr = MSR_K7_PERFCTR0;
			evntsel_msr = MSR_K7_EVNTSEL0;
	if (!reserve_perfctr_nmi(nmi_perfctr_msr))		if (!reserve_perfctr_nmi(perfctr_msr))
	goto fail;		goto fail;

	if (!reserve_evntsel_nmi(MSR_K7_EVNTSEL0))		if (!reserve_evntsel_nmi(evntsel_msr))
	goto fail1;		goto fail1;

	/* Simulator may not support it */		/* Simulator may not support it */
	if (checking_wrmsrl(MSR_K7_EVNTSEL0, 0UL))		if (checking_wrmsrl(evntsel_msr, 0UL))
	goto fail2;		goto fail2;
	wrmsrl(MSR_K7_PERFCTR0, 0UL);		wrmsrl(perfctr_msr, 0UL);

	evntsel = K7_EVNTSEL_INT		evntsel = K7_EVNTSEL_INT
	\| K7_EVNTSEL_OS		\| K7_EVNTSEL_OS
	\| K7_EVNTSEL_USR		\| K7_EVNTSEL_USR
	\| K7_NMI_EVENT;		\| K7_NMI_EVENT;

	wrmsr(MSR_K7_EVNTSEL0, evntsel, 0);		/* setup the timer */
	wrmsrl(MSR_K7_PERFCTR0, -((u64)cpu_khz * 1000 / nmi_hz));		wrmsr(evntsel_msr, evntsel, 0);
			wrmsrl(perfctr_msr, -((u64)cpu_khz * 1000 / nmi_hz));
	apic_write(APIC_LVTPC, APIC_DM_NMI);		apic_write(APIC_LVTPC, APIC_DM_NMI);
	evntsel \|= K7_EVNTSEL_ENABLE;		evntsel \|= K7_EVNTSEL_ENABLE;
	wrmsr(MSR_K7_EVNTSEL0, evntsel, 0);		wrmsr(evntsel_msr, evntsel, 0);

			wd->perfctr_msr = perfctr_msr;
			wd->evntsel_msr = evntsel_msr;
			wd->cccr_msr = 0; //unused
			wd->check_bit = 1ULL<<63;
	return 1;		return 1;
	fail2:		fail2:
	release_evntsel_nmi(MSR_K7_EVNTSEL0);		release_evntsel_nmi(evntsel_msr);
	fail1:		fail1:
	release_perfctr_nmi(nmi_perfctr_msr);		release_perfctr_nmi(perfctr_msr);
	fail:		fail:
	return 0;		return 0;
	}		}

			static void stop_k7_watchdog(void)
			{
			struct nmi_watchdog_ctlblk *wd = &__get_cpu_var(nmi_watchdog_ctlblk);

			wrmsr(wd->evntsel_msr, 0, 0);

			release_evntsel_nmi(wd->evntsel_msr);
			release_perfctr_nmi(wd->perfctr_msr);
			}

			/* Note that these events don't tick when the CPU idles. This means
			the frequency varies with CPU load. */

			#define MSR_P4_MISC_ENABLE_PERF_AVAIL (1<<7)
			#define P4_ESCR_EVENT_SELECT(N) ((N)<<25)
			#define P4_ESCR_OS (1<<3)
			#define P4_ESCR_USR (1<<2)
			#define P4_CCCR_OVF_PMI0 (1<<26)
			#define P4_CCCR_OVF_PMI1 (1<<27)
			#define P4_CCCR_THRESHOLD(N) ((N)<<20)
			#define P4_CCCR_COMPLEMENT (1<<19)
			#define P4_CCCR_COMPARE (1<<18)
			#define P4_CCCR_REQUIRED (3<<16)
			#define P4_CCCR_ESCR_SELECT(N) ((N)<<13)
			#define P4_CCCR_ENABLE (1<<12)
			#define P4_CCCR_OVF (1<<31)
			/* Set up IQ_COUNTER0 to behave like a clock, by having IQ_CCCR0 filter
			CRU_ESCR0 (with any non-null event selector) through a complemented
			max threshold. [IA32-Vol3, Section 14.9.9] */

	static int setup_p4_watchdog(void)		static int setup_p4_watchdog(void)
	{		{
			unsigned int perfctr_msr, evntsel_msr, cccr_msr;
			unsigned int evntsel, cccr_val;
	unsigned int misc_enable, dummy;		unsigned int misc_enable, dummy;
			unsigned int ht_num;
			struct nmi_watchdog_ctlblk *wd = &__get_cpu_var(nmi_watchdog_ctlblk);

	rdmsr(MSR_P4_MISC_ENABLE, misc_enable, dummy);		rdmsr(MSR_IA32_MISC_ENABLE, misc_enable, dummy);
	if (!(misc_enable & MSR_P4_MISC_ENABLE_PERF_AVAIL))		if (!(misc_enable & MSR_P4_MISC_ENABLE_PERF_AVAIL))
	return 0;		return 0;

	nmi_perfctr_msr = MSR_P4_IQ_COUNTER0;
	nmi_p4_cccr_val = P4_NMI_IQ_CCCR0;
	#ifdef CONFIG_SMP		#ifdef CONFIG_SMP
	if (smp_num_siblings == 2)		/* detect which hyperthread we are on */
	nmi_p4_cccr_val \|= P4_CCCR_OVF_PMI1;		if (smp_num_siblings == 2) {
			unsigned int ebx, apicid;

			ebx = cpuid_ebx(1);
			apicid = (ebx >> 24) & 0xff;
			ht_num = apicid & 1;
			} else
	#endif		#endif
			ht_num = 0;

			/* performance counters are shared resources
			* assign each hyperthread its own set
			* (re-use the ESCR0 register, seems safe
			* and keeps the cccr_val the same)
			*/
			if (!ht_num) {
			/* logical cpu 0 */
			perfctr_msr = MSR_P4_IQ_PERFCTR0;
			evntsel_msr = MSR_P4_CRU_ESCR0;
			cccr_msr = MSR_P4_IQ_CCCR0;
			cccr_val = P4_CCCR_OVF_PMI0 \| P4_CCCR_ESCR_SELECT(4);
			} else {
			/* logical cpu 1 */
			perfctr_msr = MSR_P4_IQ_PERFCTR1;
			evntsel_msr = MSR_P4_CRU_ESCR0;
			cccr_msr = MSR_P4_IQ_CCCR1;
			cccr_val = P4_CCCR_OVF_PMI1 \| P4_CCCR_ESCR_SELECT(4);
			}

	if (!reserve_perfctr_nmi(nmi_perfctr_msr))		if (!reserve_perfctr_nmi(perfctr_msr))
	goto fail;		goto fail;

	if (!reserve_evntsel_nmi(MSR_P4_CRU_ESCR0))		if (!reserve_evntsel_nmi(evntsel_msr))
	goto fail1;		goto fail1;

	wrmsr(MSR_P4_CRU_ESCR0, P4_NMI_CRU_ESCR0, 0);		evntsel = P4_ESCR_EVENT_SELECT(0x3F)
	wrmsr(MSR_P4_IQ_CCCR0, P4_NMI_IQ_CCCR0 & ~P4_CCCR_ENABLE, 0);		\| P4_ESCR_OS
	Dprintk("setting P4_IQ_COUNTER0 to 0x%08lx\n", -(cpu_khz * 1000UL / nmi_hz));		\| P4_ESCR_USR;
	wrmsrl(MSR_P4_IQ_COUNTER0, -((u64)cpu_khz * 1000 / nmi_hz));
			cccr_val \|= P4_CCCR_THRESHOLD(15)
			\| P4_CCCR_COMPLEMENT
			\| P4_CCCR_COMPARE
			\| P4_CCCR_REQUIRED;

			wrmsr(evntsel_msr, evntsel, 0);
			wrmsr(cccr_msr, cccr_val, 0);
			wrmsrl(perfctr_msr, -((u64)cpu_khz * 1000 / nmi_hz));
	apic_write(APIC_LVTPC, APIC_DM_NMI);		apic_write(APIC_LVTPC, APIC_DM_NMI);
	wrmsr(MSR_P4_IQ_CCCR0, nmi_p4_cccr_val, 0);		cccr_val \|= P4_CCCR_ENABLE;
			wrmsr(cccr_msr, cccr_val, 0);

			wd->perfctr_msr = perfctr_msr;
			wd->evntsel_msr = evntsel_msr;
			wd->cccr_msr = cccr_msr;
			wd->check_bit = 1ULL<<39;
	return 1;		return 1;
	fail1:		fail1:
	release_perfctr_nmi(nmi_perfctr_msr);		release_perfctr_nmi(perfctr_msr);
	fail:		fail:
	return 0;		return 0;
	}		}

	void setup_apic_nmi_watchdog(void)		static void stop_p4_watchdog(void)
	{		{
			struct nmi_watchdog_ctlblk *wd = &__get_cpu_var(nmi_watchdog_ctlblk);

			wrmsr(wd->cccr_msr, 0, 0);
			wrmsr(wd->evntsel_msr, 0, 0);

			release_evntsel_nmi(wd->evntsel_msr);
			release_perfctr_nmi(wd->perfctr_msr);
			}

			void setup_apic_nmi_watchdog(void *unused)
			{
			/* only support LOCAL and IO APICs for now */
			if ((nmi_watchdog != NMI_LOCAL_APIC) &&
			(nmi_watchdog != NMI_IO_APIC))
			return;

			if (nmi_watchdog == NMI_LOCAL_APIC) {
	switch (boot_cpu_data.x86_vendor) {		switch (boot_cpu_data.x86_vendor) {
	case X86_VENDOR_AMD:		case X86_VENDOR_AMD:
	if (boot_cpu_data.x86 != 15)
	return;
	if (strstr(boot_cpu_data.x86_model_id, "Screwdriver"))		if (strstr(boot_cpu_data.x86_model_id, "Screwdriver"))
	return;		return;
	if (!setup_k7_watchdog())		if (!setup_k7_watchdog())
	return;		return;
	break;		break;
	case X86_VENDOR_INTEL:		case X86_VENDOR_INTEL:
	if (boot_cpu_data.x86 != 15)
	return;
	if (!setup_p4_watchdog())		if (!setup_p4_watchdog())
	return;		return;
	break;		break;
			default:
			return;
			}
			}
			__get_cpu_var(nmi_watchdog_ctlblk.enabled) = 1;
			atomic_inc(&nmi_active);
			}

			static void stop_apic_nmi_watchdog(void *unused)
			{
			/* only support LOCAL and IO APICs for now */
			if ((nmi_watchdog != NMI_LOCAL_APIC) &&
			(nmi_watchdog != NMI_IO_APIC))
			return;

			if (nmi_watchdog == NMI_LOCAL_APIC) {
			switch (boot_cpu_data.x86_vendor) {
			case X86_VENDOR_AMD:
			if (strstr(boot_cpu_data.x86_model_id, "Screwdriver"))
			return;
			stop_k7_watchdog();
			break;
			case X86_VENDOR_INTEL:
			stop_p4_watchdog();
			break;
	default:		default:
	return;		return;
	}		}
	lapic_nmi_owner = LAPIC_NMI_WATCHDOG;		}
	nmi_active = 1;		__get_cpu_var(nmi_watchdog_ctlblk.enabled) = 0;
			atomic_dec(&nmi_active);
	}		}

	/*		/*
	@@ -558,38 +686,52 @@ void __kprobes nmi_watchdog_tick(struct pt_regs * regs, unsigned reason)
	{		{
	int sum;		int sum;
	int touched = 0;		int touched = 0;
			struct nmi_watchdog_ctlblk *wd = &__get_cpu_var(nmi_watchdog_ctlblk);
			u64 dummy;

			/* check for other users first */
			if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT)
			== NOTIFY_STOP) {
			touched = 1;
			}

	sum = read_pda(apic_timer_irqs);		sum = read_pda(apic_timer_irqs);
	if (__get_cpu_var(nmi_touch)) {		if (__get_cpu_var(nmi_touch)) {
	__get_cpu_var(nmi_touch) = 0;		__get_cpu_var(nmi_touch) = 0;
	touched = 1;		touched = 1;
	}		}

	#ifdef CONFIG_X86_MCE		#ifdef CONFIG_X86_MCE
	/* Could check oops_in_progress here too, but it's safer		/* Could check oops_in_progress here too, but it's safer
	not too */		not too */
	if (atomic_read(&mce_entry) > 0)		if (atomic_read(&mce_entry) > 0)
	touched = 1;		touched = 1;
	#endif		#endif
			/* if the apic timer isn't firing, this cpu isn't doing much */
	if (!touched && __get_cpu_var(last_irq_sum) == sum) {		if (!touched && __get_cpu_var(last_irq_sum) == sum) {
	/*		/*
	* Ayiee, looks like this CPU is stuck ...		* Ayiee, looks like this CPU is stuck ...
	* wait a few IRQs (5 seconds) before doing the oops ...		* wait a few IRQs (5 seconds) before doing the oops ...
	*/		*/
	local_inc(&__get_cpu_var(alert_counter));		local_inc(&__get_cpu_var(alert_counter));
	if (local_read(&__get_cpu_var(alert_counter)) == 5*nmi_hz) {		if (local_read(&__get_cpu_var(alert_counter)) == 5*nmi_hz)
	if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT)
	== NOTIFY_STOP) {
	local_set(&__get_cpu_var(alert_counter), 0);
	return;
	}
	die_nmi("NMI Watchdog detected LOCKUP on CPU %d\n", regs);		die_nmi("NMI Watchdog detected LOCKUP on CPU %d\n", regs);
	}
	} else {		} else {
	__get_cpu_var(last_irq_sum) = sum;		__get_cpu_var(last_irq_sum) = sum;
	local_set(&__get_cpu_var(alert_counter), 0);		local_set(&__get_cpu_var(alert_counter), 0);
	}		}
	if (nmi_perfctr_msr) {
	if (nmi_perfctr_msr == MSR_P4_IQ_COUNTER0) {		/* see if the nmi watchdog went off */
			if (wd->enabled) {
			if (nmi_watchdog == NMI_LOCAL_APIC) {
			rdmsrl(wd->perfctr_msr, dummy);
			if (dummy & wd->check_bit){
			/* this wasn't a watchdog timer interrupt */
			goto done;
			}

			/* only Intel uses the cccr msr */
			if (wd->cccr_msr != 0) {
	/*		/*
	* P4 quirks:		* P4 quirks:
	* - An overflown perfctr will assert its interrupt		* - An overflown perfctr will assert its interrupt
	@@ -597,12 +739,18 @@ void __kprobes nmi_watchdog_tick(struct pt_regs * regs, unsigned reason)
	* - LVTPC is masked on interrupt and must be		* - LVTPC is masked on interrupt and must be
	* unmasked by the LVTPC handler.		* unmasked by the LVTPC handler.
	*/		*/
	wrmsr(MSR_P4_IQ_CCCR0, nmi_p4_cccr_val, 0);		rdmsrl(wd->cccr_msr, dummy);
			dummy &= ~P4_CCCR_OVF;
			wrmsrl(wd->cccr_msr, dummy);
	apic_write(APIC_LVTPC, APIC_DM_NMI);		apic_write(APIC_LVTPC, APIC_DM_NMI);
	}		}
	wrmsrl(nmi_perfctr_msr, -((u64)cpu_khz * 1000 / nmi_hz));		/* start the cycle over again */
			wrmsrl(wd->perfctr_msr, -((u64)cpu_khz * 1000 / nmi_hz));
	}		}
	}		}
			done:
			return;
			}

	static __kprobes int dummy_nmi_callback(struct pt_regs * regs, int cpu)		static __kprobes int dummy_nmi_callback(struct pt_regs * regs, int cpu)
	{		{

include/asm-x86_64/nmi.h

+2 −1

Original line number	Original line	Diff line number	Diff line
	@@ -63,7 +63,7 @@ extern void release_perfctr_nmi(unsigned int);
	extern int reserve_evntsel_nmi(unsigned int);		extern int reserve_evntsel_nmi(unsigned int);
	extern void release_evntsel_nmi(unsigned int);		extern void release_evntsel_nmi(unsigned int);

	extern void setup_apic_nmi_watchdog (void);		extern void setup_apic_nmi_watchdog (void *);
	extern int reserve_lapic_nmi(void);		extern int reserve_lapic_nmi(void);
	extern void release_lapic_nmi(void);		extern void release_lapic_nmi(void);
	extern void disable_timer_nmi_watchdog(void);		extern void disable_timer_nmi_watchdog(void);
	@@ -73,6 +73,7 @@ extern void nmi_watchdog_tick (struct pt_regs * regs, unsigned reason);
	extern void nmi_watchdog_default(void);		extern void nmi_watchdog_default(void);
	extern int setup_nmi_watchdog(char *);		extern int setup_nmi_watchdog(char *);

			extern atomic_t nmi_active;
	extern unsigned int nmi_watchdog;		extern unsigned int nmi_watchdog;
	#define NMI_DEFAULT -1		#define NMI_DEFAULT -1
	#define NMI_NONE 0		#define NMI_NONE 0