* Mikael Pettersson : PM converted to driver model. Disable/enable API.
*/
-#include <linux/config.h>
+#include <linux/nmi.h>
#include <linux/mm.h>
#include <linux/delay.h>
-#include <linux/bootmem.h>
-#include <linux/smp_lock.h>
#include <linux/interrupt.h>
-#include <linux/mc146818rtc.h>
-#include <linux/kernel_stat.h>
#include <linux/module.h>
#include <linux/sysdev.h>
-#include <linux/nmi.h>
#include <linux/sysctl.h>
#include <linux/kprobes.h>
+#include <linux/cpumask.h>
#include <asm/smp.h>
-#include <asm/mtrr.h>
-#include <asm/mpspec.h>
#include <asm/nmi.h>
-#include <asm/msr.h>
#include <asm/proto.h>
#include <asm/kdebug.h>
-#include <asm/local.h>
+#include <asm/mce.h>
+#include <asm/intel_arch_perfmon.h>
+
+int unknown_nmi_panic;
+int nmi_watchdog_enabled;
+int panic_on_unrecovered_nmi;
+
+/* perfctr_nmi_owner tracks the ownership of the perfctr registers:
+ * evtsel_nmi_owner tracks the ownership of the event selection
+ * - different performance counters/ event selection may be reserved for
+ * different subsystems this reservation system just tries to coordinate
+ * things a little
+ */
-/*
- * lapic_nmi_owner tracks the ownership of the lapic NMI hardware:
- * - it may be reserved by some other driver, or not
- * - when not reserved by some other driver, it may be used for
- * the NMI watchdog, or not
- *
- * This is maintained separately from nmi_active because the NMI
- * watchdog may also be driven from the I/O APIC timer.
+/* this number is calculated from Intel's MSR_P4_CRU_ESCR5 register and it's
+ * offset from MSR_P4_BSU_ESCR0. It will be the max for all platforms (for now)
*/
-static DEFINE_SPINLOCK(lapic_nmi_owner_lock);
-static unsigned int lapic_nmi_owner;
-#define LAPIC_NMI_WATCHDOG (1<<0)
-#define LAPIC_NMI_RESERVED (1<<1)
+#define NMI_MAX_COUNTER_BITS 66
+#define NMI_MAX_COUNTER_LONGS BITS_TO_LONGS(NMI_MAX_COUNTER_BITS)
+
+static DEFINE_PER_CPU(unsigned, perfctr_nmi_owner[NMI_MAX_COUNTER_LONGS]);
+static DEFINE_PER_CPU(unsigned, evntsel_nmi_owner[NMI_MAX_COUNTER_LONGS]);
+
+static cpumask_t backtrace_mask = CPU_MASK_NONE;
/* nmi_active:
- * +1: 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 is active, but can be disabled
+ * <0: the lapic NMI watchdog has not been set up, and cannot
* 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;
-unsigned int nmi_watchdog = NMI_DEFAULT;
+unsigned int nmi_watchdog = NMI_NONE;
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
- the frequency varies with CPU load. */
+struct nmi_watchdog_ctlblk {
+ 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)
-#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
+/* local prototypes */
+static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu);
-#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 */
+static inline unsigned int nmi_perfctr_msr_to_bit(unsigned int msr)
+{
+ /* returns the bit offset of the performance counter register */
+ switch (boot_cpu_data.x86_vendor) {
+ case X86_VENDOR_AMD:
+ return (msr - MSR_K7_PERFCTR0);
+ case X86_VENDOR_INTEL:
+ if (cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON))
+ return (msr - MSR_ARCH_PERFMON_PERFCTR0);
+ else
+ return (msr - MSR_P4_BPU_PERFCTR0);
+ }
+ return 0;
+}
+
+/* converts an msr to an appropriate reservation bit */
+static inline unsigned int nmi_evntsel_msr_to_bit(unsigned int msr)
+{
+ /* returns the bit offset of the event selection register */
+ switch (boot_cpu_data.x86_vendor) {
+ case X86_VENDOR_AMD:
+ return (msr - MSR_K7_EVNTSEL0);
+ case X86_VENDOR_INTEL:
+ if (cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON))
+ return (msr - MSR_ARCH_PERFMON_EVENTSEL0);
+ else
+ return (msr - MSR_P4_BSU_ESCR0);
+ }
+ return 0;
+}
+
+/* checks for a bit availability (hack for oprofile) */
+int avail_to_resrv_perfctr_nmi_bit(unsigned int counter)
+{
+ BUG_ON(counter > NMI_MAX_COUNTER_BITS);
+
+ return (!test_bit(counter, &__get_cpu_var(perfctr_nmi_owner)));
+}
+
+/* checks the an msr for availability */
+int avail_to_resrv_perfctr_nmi(unsigned int msr)
+{
+ unsigned int counter;
+
+ counter = nmi_perfctr_msr_to_bit(msr);
+ BUG_ON(counter > NMI_MAX_COUNTER_BITS);
+
+ return (!test_bit(counter, &__get_cpu_var(perfctr_nmi_owner)));
+}
+
+int reserve_perfctr_nmi(unsigned int msr)
+{
+ unsigned int counter;
+
+ counter = nmi_perfctr_msr_to_bit(msr);
+ BUG_ON(counter > NMI_MAX_COUNTER_BITS);
+
+ if (!test_and_set_bit(counter, &__get_cpu_var(perfctr_nmi_owner)))
+ return 1;
+ return 0;
+}
+
+void release_perfctr_nmi(unsigned int msr)
+{
+ unsigned int counter;
+
+ counter = nmi_perfctr_msr_to_bit(msr);
+ BUG_ON(counter > NMI_MAX_COUNTER_BITS);
+
+ clear_bit(counter, &__get_cpu_var(perfctr_nmi_owner));
+}
+
+int reserve_evntsel_nmi(unsigned int msr)
+{
+ unsigned int counter;
+
+ counter = nmi_evntsel_msr_to_bit(msr);
+ BUG_ON(counter > NMI_MAX_COUNTER_BITS);
+
+ if (!test_and_set_bit(counter, &__get_cpu_var(evntsel_nmi_owner)))
+ return 1;
+ return 0;
+}
+
+void release_evntsel_nmi(unsigned int msr)
+{
+ unsigned int counter;
+
+ counter = nmi_evntsel_msr_to_bit(msr);
+ BUG_ON(counter > NMI_MAX_COUNTER_BITS);
+
+ clear_bit(counter, &__get_cpu_var(evntsel_nmi_owner));
+}
static __cpuinit inline int nmi_known_cpu(void)
{
case X86_VENDOR_AMD:
return boot_cpu_data.x86 == 15;
case X86_VENDOR_INTEL:
- return boot_cpu_data.x86 == 15;
+ if (cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON))
+ return 1;
+ else
+ return (boot_cpu_data.x86 == 15);
}
return 0;
}
/* Run after command line and cpu_init init, but before all other checks */
-void __cpuinit nmi_watchdog_default(void)
+void nmi_watchdog_default(void)
{
if (nmi_watchdog != NMI_DEFAULT)
return;
nmi_watchdog = NMI_IO_APIC;
}
+static int endflag __initdata = 0;
+
#ifdef CONFIG_SMP
/* The performance counters used by NMI_LOCAL_APIC don't trigger when
* the CPU is idle. To make sure the NMI watchdog really ticks on all
*/
static __init void nmi_cpu_busy(void *data)
{
- volatile int *endflag = data;
- local_irq_enable();
+ local_irq_enable_in_hardirq();
/* Intentionally don't use cpu_relax here. This is
to make sure that the performance counter really ticks,
even if there is a simulator or similar that catches the
pause instruction. On a real HT machine this is fine because
all other CPUs are busy with "useless" delay loops and don't
care if they get somewhat less cycles. */
- while (*endflag == 0)
- barrier();
+ while (endflag == 0)
+ mb();
}
#endif
int __init check_nmi_watchdog (void)
{
- volatile int endflag = 0;
int *counts;
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);
if (!counts)
return -1;
local_irq_enable();
mdelay((10*1000)/nmi_hz); // wait 10 ticks
- for (cpu = 0; cpu < NR_CPUS; cpu++) {
- if (!cpu_online(cpu))
+ for_each_online_cpu(cpu) {
+ if (!per_cpu(nmi_watchdog_ctlblk, cpu).enabled)
continue;
if (cpu_pda(cpu)->__nmi_count - counts[cpu] <= 5) {
- endflag = 1;
printk("CPU#%d: NMI appears to be stuck (%d->%d)!\n",
cpu,
counts[cpu],
cpu_pda(cpu)->__nmi_count);
- nmi_active = 0;
- lapic_nmi_owner &= ~LAPIC_NMI_WATCHDOG;
- nmi_perfctr_msr = 0;
- kfree(counts);
- return -1;
+ per_cpu(nmi_watchdog_ctlblk, cpu).enabled = 0;
+ atomic_dec(&nmi_active);
}
}
+ if (!atomic_read(&nmi_active)) {
+ kfree(counts);
+ atomic_set(&nmi_active, -1);
+ endflag = 1;
+ return -1;
+ }
endflag = 1;
printk("OK.\n");
/* now that we know it works we can reduce NMI frequency to
something more reasonable; makes a difference in some configs */
- if (nmi_watchdog == NMI_LOCAL_APIC)
+ if (nmi_watchdog == NMI_LOCAL_APIC) {
+ struct nmi_watchdog_ctlblk *wd = &__get_cpu_var(nmi_watchdog_ctlblk);
+
nmi_hz = 1;
+ /*
+ * On Intel CPUs with ARCH_PERFMON only 32 bits in the counter
+ * are writable, with higher bits sign extending from bit 31.
+ * So, we can only program the counter with 31 bit values and
+ * 32nd bit should be 1, for 33.. to be 1.
+ * Find the appropriate nmi_hz
+ */
+ if (wd->perfctr_msr == MSR_ARCH_PERFMON_PERFCTR0 &&
+ ((u64)cpu_khz * 1000) > 0x7fffffffULL) {
+ nmi_hz = ((u64)cpu_khz * 1000) / 0x7fffffffUL + 1;
+ }
+ }
kfree(counts);
return 0;
get_option(&str, &nmi);
- if (nmi >= NMI_INVALID)
+ if ((nmi >= NMI_INVALID) || (nmi < NMI_NONE))
return 0;
+
nmi_watchdog = nmi;
return 1;
}
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;
- switch (boot_cpu_data.x86_vendor) {
- case X86_VENDOR_AMD:
- wrmsr(MSR_K7_EVNTSEL0, 0, 0);
- break;
- 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)
-{
- if (nmi_active < 0) {
- nmi_watchdog = NMI_LOCAL_APIC;
- touch_nmi_watchdog();
- setup_apic_nmi_watchdog();
- }
+ on_each_cpu(stop_apic_nmi_watchdog, NULL, 0, 1);
+
+ BUG_ON(atomic_read(&nmi_active) != 0);
}
-int reserve_lapic_nmi(void)
+static void enable_lapic_nmi_watchdog(void)
{
- unsigned int old_owner;
+ BUG_ON(nmi_watchdog != NMI_LOCAL_APIC);
- spin_lock(&lapic_nmi_owner_lock);
- old_owner = lapic_nmi_owner;
- lapic_nmi_owner |= LAPIC_NMI_RESERVED;
- spin_unlock(&lapic_nmi_owner_lock);
- if (old_owner & LAPIC_NMI_RESERVED)
- return -EBUSY;
- if (old_owner & LAPIC_NMI_WATCHDOG)
- disable_lapic_nmi_watchdog();
- return 0;
-}
+ /* are we already enabled */
+ if (atomic_read(&nmi_active) != 0)
+ return;
-void release_lapic_nmi(void)
-{
- unsigned int new_owner;
+ /* are we lapic aware */
+ if (nmi_known_cpu() <= 0)
+ return;
- spin_lock(&lapic_nmi_owner_lock);
- new_owner = lapic_nmi_owner & ~LAPIC_NMI_RESERVED;
- lapic_nmi_owner = new_owner;
- spin_unlock(&lapic_nmi_owner_lock);
- if (new_owner & LAPIC_NMI_WATCHDOG)
- enable_lapic_nmi_watchdog();
+ on_each_cpu(setup_apic_nmi_watchdog, NULL, 0, 1);
+ touch_nmi_watchdog();
}
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;
disable_irq(0);
- unset_nmi_callback();
- nmi_active = -1;
- nmi_watchdog = NMI_NONE;
+ on_each_cpu(stop_apic_nmi_watchdog, NULL, 0, 1);
+
+ BUG_ON(atomic_read(&nmi_active) != 0);
}
void enable_timer_nmi_watchdog(void)
{
- if (nmi_active < 0) {
- nmi_watchdog = NMI_IO_APIC;
+ BUG_ON(nmi_watchdog != NMI_IO_APIC);
+
+ if (atomic_read(&nmi_active) == 0) {
touch_nmi_watchdog();
- nmi_active = 1;
+ on_each_cpu(setup_apic_nmi_watchdog, NULL, 0, 1);
enable_irq(0);
}
}
static int lapic_nmi_suspend(struct sys_device *dev, pm_message_t state)
{
- nmi_pm_active = nmi_active;
- disable_lapic_nmi_watchdog();
+ /* only CPU0 goes here, other CPUs should be offline */
+ nmi_pm_active = atomic_read(&nmi_active);
+ stop_apic_nmi_watchdog(NULL);
+ BUG_ON(atomic_read(&nmi_active) != 0);
return 0;
}
static int lapic_nmi_resume(struct sys_device *dev)
{
- if (nmi_pm_active > 0)
- enable_lapic_nmi_watchdog();
+ /* only CPU0 goes here, other CPUs should be offline */
+ if (nmi_pm_active > 0) {
+ setup_apic_nmi_watchdog(NULL);
+ touch_nmi_watchdog();
+ }
return 0;
}
{
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;
error = sysdev_class_register(&nmi_sysclass);
* Original code written by Keith Owens.
*/
-static void clear_msr_range(unsigned int base, unsigned int n)
-{
- unsigned int i;
+/* Note that these events don't tick when the CPU idles. This means
+ the frequency varies with CPU load. */
- for(i = 0; i < n; ++i)
- wrmsr(base+i, 0, 0);
-}
+#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 void setup_k7_watchdog(void)
+static int setup_k7_watchdog(void)
{
- int i;
+ unsigned int perfctr_msr, evntsel_msr;
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(perfctr_msr))
+ goto fail;
- for(i = 0; i < 4; ++i) {
- /* Simulator may not support it */
- if (checking_wrmsrl(MSR_K7_EVNTSEL0+i, 0UL)) {
- nmi_perfctr_msr = 0;
- return;
- }
- wrmsrl(MSR_K7_PERFCTR0+i, 0UL);
- }
+ if (!reserve_evntsel_nmi(evntsel_msr))
+ goto fail1;
+
+ /* Simulator may not support it */
+ if (checking_wrmsrl(evntsel_msr, 0UL))
+ goto fail2;
+ wrmsrl(perfctr_msr, 0UL);
evntsel = K7_EVNTSEL_INT
| K7_EVNTSEL_OS
| K7_EVNTSEL_USR
| K7_NMI_EVENT;
- wrmsr(MSR_K7_EVNTSEL0, evntsel, 0);
- wrmsrl(MSR_K7_PERFCTR0, -((u64)cpu_khz * 1000 / nmi_hz));
+ /* setup the timer */
+ wrmsr(evntsel_msr, evntsel, 0);
+ wrmsrl(perfctr_msr, -((u64)cpu_khz * 1000 / nmi_hz));
apic_write(APIC_LVTPC, APIC_DM_NMI);
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;
+fail2:
+ release_evntsel_nmi(evntsel_msr);
+fail1:
+ release_perfctr_nmi(perfctr_msr);
+fail:
+ 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)
{
+ unsigned int perfctr_msr, evntsel_msr, cccr_msr;
+ unsigned int evntsel, cccr_val;
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))
return 0;
- nmi_perfctr_msr = MSR_P4_IQ_COUNTER0;
- nmi_p4_cccr_val = P4_NMI_IQ_CCCR0;
#ifdef CONFIG_SMP
- if (smp_num_siblings == 2)
- nmi_p4_cccr_val |= P4_CCCR_OVF_PMI1;
+ /* detect which hyperthread we are on */
+ if (smp_num_siblings == 2) {
+ unsigned int ebx, apicid;
+
+ ebx = cpuid_ebx(1);
+ apicid = (ebx >> 24) & 0xff;
+ ht_num = apicid & 1;
+ } else
#endif
-
- if (!(misc_enable & MSR_P4_MISC_ENABLE_PEBS_UNAVAIL))
- clear_msr_range(0x3F1, 2);
- /* MSR 0x3F0 seems to have a default value of 0xFC00, but current
- docs doesn't fully define it, so leave it alone for now. */
- if (boot_cpu_data.x86_model >= 0x3) {
- /* MSR_P4_IQ_ESCR0/1 (0x3ba/0x3bb) removed */
- clear_msr_range(0x3A0, 26);
- clear_msr_range(0x3BC, 3);
+ 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 {
- clear_msr_range(0x3A0, 31);
+ /* 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);
}
- clear_msr_range(0x3C0, 6);
- clear_msr_range(0x3C8, 6);
- clear_msr_range(0x3E0, 2);
- clear_msr_range(MSR_P4_CCCR0, 18);
- clear_msr_range(MSR_P4_PERFCTR0, 18);
-
- wrmsr(MSR_P4_CRU_ESCR0, P4_NMI_CRU_ESCR0, 0);
- wrmsr(MSR_P4_IQ_CCCR0, P4_NMI_IQ_CCCR0 & ~P4_CCCR_ENABLE, 0);
- Dprintk("setting P4_IQ_COUNTER0 to 0x%08lx\n", -(cpu_khz * 1000UL / nmi_hz));
- wrmsrl(MSR_P4_IQ_COUNTER0, -((u64)cpu_khz * 1000 / nmi_hz));
+
+ if (!reserve_perfctr_nmi(perfctr_msr))
+ goto fail;
+
+ if (!reserve_evntsel_nmi(evntsel_msr))
+ goto fail1;
+
+ evntsel = P4_ESCR_EVENT_SELECT(0x3F)
+ | P4_ESCR_OS
+ | P4_ESCR_USR;
+
+ 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);
- 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;
+fail1:
+ release_perfctr_nmi(perfctr_msr);
+fail:
+ return 0;
}
-void setup_apic_nmi_watchdog(void)
+static void stop_p4_watchdog(void)
{
- switch (boot_cpu_data.x86_vendor) {
- case X86_VENDOR_AMD:
- if (boot_cpu_data.x86 != 15)
- return;
- if (strstr(boot_cpu_data.x86_model_id, "Screwdriver"))
- return;
- setup_k7_watchdog();
- break;
- case X86_VENDOR_INTEL:
- if (boot_cpu_data.x86 != 15)
- return;
- if (!setup_p4_watchdog())
+ 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);
+}
+
+#define ARCH_PERFMON_NMI_EVENT_SEL ARCH_PERFMON_UNHALTED_CORE_CYCLES_SEL
+#define ARCH_PERFMON_NMI_EVENT_UMASK ARCH_PERFMON_UNHALTED_CORE_CYCLES_UMASK
+
+static int setup_intel_arch_watchdog(void)
+{
+ unsigned int ebx;
+ union cpuid10_eax eax;
+ unsigned int unused;
+ unsigned int perfctr_msr, evntsel_msr;
+ unsigned int evntsel;
+ struct nmi_watchdog_ctlblk *wd = &__get_cpu_var(nmi_watchdog_ctlblk);
+
+ /*
+ * Check whether the Architectural PerfMon supports
+ * Unhalted Core Cycles Event or not.
+ * NOTE: Corresponding bit = 0 in ebx indicates event present.
+ */
+ cpuid(10, &(eax.full), &ebx, &unused, &unused);
+ if ((eax.split.mask_length < (ARCH_PERFMON_UNHALTED_CORE_CYCLES_INDEX+1)) ||
+ (ebx & ARCH_PERFMON_UNHALTED_CORE_CYCLES_PRESENT))
+ goto fail;
+
+ perfctr_msr = MSR_ARCH_PERFMON_PERFCTR0;
+ evntsel_msr = MSR_ARCH_PERFMON_EVENTSEL0;
+
+ if (!reserve_perfctr_nmi(perfctr_msr))
+ goto fail;
+
+ if (!reserve_evntsel_nmi(evntsel_msr))
+ goto fail1;
+
+ wrmsrl(perfctr_msr, 0UL);
+
+ evntsel = ARCH_PERFMON_EVENTSEL_INT
+ | ARCH_PERFMON_EVENTSEL_OS
+ | ARCH_PERFMON_EVENTSEL_USR
+ | ARCH_PERFMON_NMI_EVENT_SEL
+ | ARCH_PERFMON_NMI_EVENT_UMASK;
+
+ /* setup the timer */
+ wrmsr(evntsel_msr, evntsel, 0);
+ wrmsrl(perfctr_msr, -((u64)cpu_khz * 1000 / nmi_hz));
+
+ apic_write(APIC_LVTPC, APIC_DM_NMI);
+ evntsel |= ARCH_PERFMON_EVENTSEL0_ENABLE;
+ wrmsr(evntsel_msr, evntsel, 0);
+
+ wd->perfctr_msr = perfctr_msr;
+ wd->evntsel_msr = evntsel_msr;
+ wd->cccr_msr = 0; //unused
+ wd->check_bit = 1ULL << (eax.split.bit_width - 1);
+ return 1;
+fail1:
+ release_perfctr_nmi(perfctr_msr);
+fail:
+ return 0;
+}
+
+static void stop_intel_arch_watchdog(void)
+{
+ unsigned int ebx;
+ union cpuid10_eax eax;
+ unsigned int unused;
+ struct nmi_watchdog_ctlblk *wd = &__get_cpu_var(nmi_watchdog_ctlblk);
+
+ /*
+ * Check whether the Architectural PerfMon supports
+ * Unhalted Core Cycles Event or not.
+ * NOTE: Corresponding bit = 0 in ebx indicates event present.
+ */
+ cpuid(10, &(eax.full), &ebx, &unused, &unused);
+ if ((eax.split.mask_length < (ARCH_PERFMON_UNHALTED_CORE_CYCLES_INDEX+1)) ||
+ (ebx & ARCH_PERFMON_UNHALTED_CORE_CYCLES_PRESENT))
+ return;
+
+ 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)
+{
+ struct nmi_watchdog_ctlblk *wd = &__get_cpu_var(nmi_watchdog_ctlblk);
+
+ /* only support LOCAL and IO APICs for now */
+ if ((nmi_watchdog != NMI_LOCAL_APIC) &&
+ (nmi_watchdog != NMI_IO_APIC))
+ return;
+
+ if (wd->enabled == 1)
+ return;
+
+ /* cheap hack to support suspend/resume */
+ /* if cpu0 is not active neither should the other cpus */
+ if ((smp_processor_id() != 0) && (atomic_read(&nmi_active) <= 0))
+ 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;
+ if (!setup_k7_watchdog())
+ return;
+ break;
+ case X86_VENDOR_INTEL:
+ if (cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON)) {
+ if (!setup_intel_arch_watchdog())
+ return;
+ break;
+ }
+ if (!setup_p4_watchdog())
+ return;
+ break;
+ default:
return;
- break;
+ }
+ }
+ wd->enabled = 1;
+ atomic_inc(&nmi_active);
+}
- default:
+void stop_apic_nmi_watchdog(void *unused)
+{
+ struct nmi_watchdog_ctlblk *wd = &__get_cpu_var(nmi_watchdog_ctlblk);
+
+ /* only support LOCAL and IO APICs for now */
+ if ((nmi_watchdog != NMI_LOCAL_APIC) &&
+ (nmi_watchdog != NMI_IO_APIC))
+ return;
+
+ if (wd->enabled == 0)
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:
+ if (cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON)) {
+ stop_intel_arch_watchdog();
+ break;
+ }
+ stop_p4_watchdog();
+ break;
+ default:
+ return;
+ }
}
- lapic_nmi_owner = LAPIC_NMI_WATCHDOG;
- nmi_active = 1;
+ wd->enabled = 0;
+ atomic_dec(&nmi_active);
}
/*
touch_softlockup_watchdog();
}
-void __kprobes nmi_watchdog_tick(struct pt_regs * regs, unsigned reason)
+int __kprobes nmi_watchdog_tick(struct pt_regs * regs, unsigned reason)
{
int sum;
int touched = 0;
+ int cpu = smp_processor_id();
+ struct nmi_watchdog_ctlblk *wd = &__get_cpu_var(nmi_watchdog_ctlblk);
+ u64 dummy;
+ int rc=0;
+
+ /* check for other users first */
+ if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT)
+ == NOTIFY_STOP) {
+ rc = 1;
+ touched = 1;
+ }
sum = read_pda(apic_timer_irqs);
if (__get_cpu_var(nmi_touch)) {
__get_cpu_var(nmi_touch) = 0;
touched = 1;
}
+
+ if (cpu_isset(cpu, backtrace_mask)) {
+ static DEFINE_SPINLOCK(lock); /* Serialise the printks */
+
+ spin_lock(&lock);
+ printk("NMI backtrace for cpu %d\n", cpu);
+ dump_stack();
+ spin_unlock(&lock);
+ cpu_clear(cpu, backtrace_mask);
+ }
+
+#ifdef CONFIG_X86_MCE
+ /* Could check oops_in_progress here too, but it's safer
+ not too */
+ if (atomic_read(&mce_entry) > 0)
+ touched = 1;
+#endif
+ /* if the apic timer isn't firing, this cpu isn't doing much */
if (!touched && __get_cpu_var(last_irq_sum) == sum) {
/*
* Ayiee, looks like this CPU is stuck ...
* wait a few IRQs (5 seconds) before doing the oops ...
*/
local_inc(&__get_cpu_var(alert_counter));
- 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);
- }
+ if (local_read(&__get_cpu_var(alert_counter)) == 5*nmi_hz)
+ die_nmi("NMI Watchdog detected LOCKUP on CPU %d\n", regs,
+ panic_on_timeout);
} else {
__get_cpu_var(last_irq_sum) = sum;
local_set(&__get_cpu_var(alert_counter), 0);
}
- if (nmi_perfctr_msr) {
- if (nmi_perfctr_msr == MSR_P4_IQ_COUNTER0) {
- /*
- * P4 quirks:
- * - An overflown perfctr will assert its interrupt
- * until the OVF flag in its CCCR is cleared.
- * - LVTPC is masked on interrupt and must be
- * unmasked by the LVTPC handler.
- */
- wrmsr(MSR_P4_IQ_CCCR0, nmi_p4_cccr_val, 0);
- apic_write(APIC_LVTPC, APIC_DM_NMI);
- }
- wrmsrl(nmi_perfctr_msr, -((u64)cpu_khz * 1000 / nmi_hz));
+
+ /* 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:
+ * - An overflown perfctr will assert its interrupt
+ * until the OVF flag in its CCCR is cleared.
+ * - LVTPC is masked on interrupt and must be
+ * unmasked by the LVTPC handler.
+ */
+ rdmsrl(wd->cccr_msr, dummy);
+ dummy &= ~P4_CCCR_OVF;
+ wrmsrl(wd->cccr_msr, dummy);
+ apic_write(APIC_LVTPC, APIC_DM_NMI);
+ } else if (wd->perfctr_msr == MSR_ARCH_PERFMON_PERFCTR0) {
+ /*
+ * ArchPerfom/Core Duo needs to re-unmask
+ * the apic vector
+ */
+ apic_write(APIC_LVTPC, APIC_DM_NMI);
+ }
+ /* start the cycle over again */
+ wrmsrl(wd->perfctr_msr, -((u64)cpu_khz * 1000 / nmi_hz));
+ rc = 1;
+ } else if (nmi_watchdog == NMI_IO_APIC) {
+ /* don't know how to accurately check for this.
+ * just assume it was a watchdog timer interrupt
+ * This matches the old behaviour.
+ */
+ rc = 1;
+ } else
+ printk(KERN_WARNING "Unknown enabled NMI hardware?!\n");
}
+done:
+ return rc;
}
-static __kprobes int dummy_nmi_callback(struct pt_regs * regs, int cpu)
-{
- return 0;
-}
-
-static nmi_callback_t nmi_callback = dummy_nmi_callback;
-
asmlinkage __kprobes void do_nmi(struct pt_regs * regs, long error_code)
{
- int cpu = safe_smp_processor_id();
-
nmi_enter();
add_pda(__nmi_count,1);
- if (!rcu_dereference(nmi_callback)(regs, cpu))
- default_do_nmi(regs);
+ default_do_nmi(regs);
nmi_exit();
}
-void set_nmi_callback(nmi_callback_t callback)
-{
- rcu_assign_pointer(nmi_callback, callback);
-}
-
-void unset_nmi_callback(void)
+int do_nmi_callback(struct pt_regs * regs, int cpu)
{
- nmi_callback = dummy_nmi_callback;
+#ifdef CONFIG_SYSCTL
+ if (unknown_nmi_panic)
+ return unknown_nmi_panic_callback(regs, cpu);
+#endif
+ return 0;
}
#ifdef CONFIG_SYSCTL
unsigned char reason = get_nmi_reason();
char buf[64];
- if (!(reason & 0xc0)) {
- sprintf(buf, "NMI received for unknown reason %02x\n", reason);
- die_nmi(buf,regs);
- }
+ sprintf(buf, "NMI received for unknown reason %02x\n", reason);
+ die_nmi(buf, regs, 1); /* Always panic here */
return 0;
}
/*
- * proc handler for /proc/sys/kernel/unknown_nmi_panic
+ * proc handler for /proc/sys/kernel/nmi
*/
-int proc_unknown_nmi_panic(struct ctl_table *table, int write, struct file *file,
+int proc_nmi_enabled(struct ctl_table *table, int write, struct file *file,
void __user *buffer, size_t *length, loff_t *ppos)
{
int old_state;
- old_state = unknown_nmi_panic;
+ nmi_watchdog_enabled = (atomic_read(&nmi_active) > 0) ? 1 : 0;
+ old_state = nmi_watchdog_enabled;
proc_dointvec(table, write, file, buffer, length, ppos);
- if (!!old_state == !!unknown_nmi_panic)
+ if (!!old_state == !!nmi_watchdog_enabled)
return 0;
- if (unknown_nmi_panic) {
- if (reserve_lapic_nmi() < 0) {
- unknown_nmi_panic = 0;
- return -EBUSY;
- } else {
- set_nmi_callback(unknown_nmi_panic_callback);
- }
+ if (atomic_read(&nmi_active) < 0) {
+ printk( KERN_WARNING "NMI watchdog is permanently disabled\n");
+ return -EIO;
+ }
+
+ /* if nmi_watchdog is not set yet, then set it */
+ nmi_watchdog_default();
+
+ if (nmi_watchdog == NMI_LOCAL_APIC) {
+ if (nmi_watchdog_enabled)
+ enable_lapic_nmi_watchdog();
+ else
+ disable_lapic_nmi_watchdog();
} else {
- release_lapic_nmi();
- unset_nmi_callback();
+ printk( KERN_WARNING
+ "NMI watchdog doesn't know what hardware to touch\n");
+ return -EIO;
}
return 0;
}
#endif
+void __trigger_all_cpu_backtrace(void)
+{
+ int i;
+
+ backtrace_mask = cpu_online_map;
+ /* Wait for up to 10 seconds for all CPUs to do the backtrace */
+ for (i = 0; i < 10 * 1000; i++) {
+ if (cpus_empty(backtrace_mask))
+ break;
+ mdelay(1);
+ }
+}
+
EXPORT_SYMBOL(nmi_active);
EXPORT_SYMBOL(nmi_watchdog);
-EXPORT_SYMBOL(reserve_lapic_nmi);
-EXPORT_SYMBOL(release_lapic_nmi);
+EXPORT_SYMBOL(avail_to_resrv_perfctr_nmi);
+EXPORT_SYMBOL(avail_to_resrv_perfctr_nmi_bit);
+EXPORT_SYMBOL(reserve_perfctr_nmi);
+EXPORT_SYMBOL(release_perfctr_nmi);
+EXPORT_SYMBOL(reserve_evntsel_nmi);
+EXPORT_SYMBOL(release_evntsel_nmi);
EXPORT_SYMBOL(disable_timer_nmi_watchdog);
EXPORT_SYMBOL(enable_timer_nmi_watchdog);
EXPORT_SYMBOL(touch_nmi_watchdog);
git://git.onelab.eu / linux-2.6.git / blobdiff