perf_counter, x86: Fix APIC NMI programming

My Nehalem box locks up in certain situations (with an
always-asserted NMI causing a lockup) if the PMU LVT
entry is programmed between NMI and IRQ mode with a
high frequency.

Standardize exlusively on NMIs instead.

[ Impact: fix lockup ]

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: John Kacur <jkacur@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c
index 189bf9d..ece3813 100644 (file)
--- a/arch/x86/kernel/cpu/perf_counter.c
+++ b/arch/x86/kernel/cpu/perf_counter.c
@@ -285,14 +285,10 @@ static int __hw_perf_counter_init(struct perf_counter *counter)
                hwc->config |= ARCH_PERFMON_EVENTSEL_OS;
 
        /*
-        * If privileged enough, allow NMI events:
+        * Use NMI events all the time:
         */
-       hwc->nmi = 0;
-       if (hw_event->nmi) {
-               if (sysctl_perf_counter_priv && !capable(CAP_SYS_ADMIN))
-                       return -EACCES;
-               hwc->nmi = 1;
-       }
+       hwc->nmi        = 1;
+       hw_event->nmi   = 1;
 
        if (!hwc->irq_period)
                hwc->irq_period = x86_pmu.max_period;
@@ -553,9 +549,6 @@ fixed_mode_idx(struct perf_counter *counter, struct hw_perf_counter *hwc)
        if (!x86_pmu.num_counters_fixed)
                return -1;
 
-       if (unlikely(hwc->nmi))
-               return -1;
-
        event = hwc->config & ARCH_PERFMON_EVENT_MASK;
 
        if (unlikely(event == x86_pmu.event_map(PERF_COUNT_INSTRUCTIONS)))
@@ -806,9 +799,6 @@ static int amd_pmu_handle_irq(struct pt_regs *regs, int nmi)
                counter = cpuc->counters[idx];
                hwc = &counter->hw;
 
-               if (counter->hw_event.nmi != nmi)
-                       continue;
-
                val = x86_perf_counter_update(counter, hwc, idx);
                if (val & (1ULL << (x86_pmu.counter_bits - 1)))
                        continue;