perf_counter: Fix up P6 PMU details

The P6 doesn't seem to support cache ref/hit/miss counts, so
we extend the generic hardware event codes to have 0 and -1
mean the same thing as for the generic cache events.

Furthermore, it turns out the 0 event does not count
(that is, its reported that on PPro it actually does count
something), therefore use a event configuration that's
specified not to count to disable the counters.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 23 insertions, 5 deletions

diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c
index 1910f39ff19a..c7cc6eac14ec 100644
--- a/arch/x86/kernel/cpu/perf_counter.c
+++ b/arch/x86/kernel/cpu/perf_counter.c
@@ -84,6 +84,14 @@ static u64 p6_pmu_event_map(int event)
         return p6_perfmon_event_map[event];
 }
 
+/*
+ * Counter setting that is specified not to count anything.
+ * We use this to effectively disable a counter.
+ *
+ * L2_RQSTS with 0 MESI unit mask.
+ */
+#define P6_NOP_COUNTER                  0x0000002EULL
+
 static u64 p6_pmu_raw_event(u64 event)
 {
 #define P6_EVNTSEL_EVENT_MASK           0x000000FFULL
@@ -704,6 +712,7 @@ static int __hw_perf_counter_init(struct perf_counter *counter)
 {
         struct perf_counter_attr *attr = &counter->attr;
         struct hw_perf_counter *hwc = &counter->hw;
+        u64 config;
         int err;
 
         if (!x86_pmu_initialized())
@@ -756,10 +765,19 @@ static int __hw_perf_counter_init(struct perf_counter *counter)
 
         if (attr->config >= x86_pmu.max_events)
                 return -EINVAL;
+
         /*
          * The generic map:
          */
-        hwc->config |= x86_pmu.event_map(attr->config);
+        config = x86_pmu.event_map(attr->config);
+
+        if (config == 0)
+                return -ENOENT;
+
+        if (config == -1LL)
+                return -EINVAL;
+
+        hwc->config |= config;
 
         return 0;
 }
@@ -767,7 +785,7 @@ static int __hw_perf_counter_init(struct perf_counter *counter)
 static void p6_pmu_disable_all(void)
 {
         struct cpu_hw_counters *cpuc = &__get_cpu_var(cpu_hw_counters);
-        unsigned long val;
+        u64 val;
 
         if (!cpuc->enabled)
                 return;
@@ -917,10 +935,10 @@ static inline void
 p6_pmu_disable_counter(struct hw_perf_counter *hwc, int idx)
 {
         struct cpu_hw_counters *cpuc = &__get_cpu_var(cpu_hw_counters);
-        unsigned long val = ARCH_PERFMON_EVENTSEL0_ENABLE;
+        u64 val = P6_NOP_COUNTER;
 
-        if (!cpuc->enabled)
-                val = 0;
+        if (cpuc->enabled)
+                val |= ARCH_PERFMON_EVENTSEL0_ENABLE;
 
         (void)checking_wrmsrl(hwc->config_base + idx, val);
 }