sparc64: Make sparc_pmu_{enable,disable}_event() multi-pcr aware.

Signed-off-by: NDavid S. Miller <davem@davemloft.net>

arch/sparc/kernel/perf_event.c

@@ -623,27 +623,35 @@ static u64 nop_for_index(int idx)
 static inline void sparc_pmu_enable_event(struct cpu_hw_events *cpuc, struct hw_perf_event *hwc, int idx)
 {
 	u64 val, mask = mask_for_index(idx);
+	int pcr_index = 0;
 
-	val = cpuc->pcr[0];
+	if (sparc_pmu->num_pcrs > 1)
+		pcr_index = idx;
+
+	val = cpuc->pcr[pcr_index];
 	val &= ~mask;
 	val |= hwc->config;
-	cpuc->pcr[0] = val;
+	cpuc->pcr[pcr_index] = val;
 
-	pcr_ops->write_pcr(0, cpuc->pcr[0]);
+	pcr_ops->write_pcr(pcr_index, cpuc->pcr[pcr_index]);
 }
 
 static inline void sparc_pmu_disable_event(struct cpu_hw_events *cpuc, struct hw_perf_event *hwc, int idx)
 {
 	u64 mask = mask_for_index(idx);
 	u64 nop = nop_for_index(idx);
+	int pcr_index = 0;
 	u64 val;
 
-	val = cpuc->pcr[0];
+	if (sparc_pmu->num_pcrs > 1)
+		pcr_index = idx;
+
+	val = cpuc->pcr[pcr_index];
 	val &= ~mask;
 	val |= nop;
-	cpuc->pcr[0] = val;
+	cpuc->pcr[pcr_index] = val;
 
-	pcr_ops->write_pcr(0, cpuc->pcr[0]);
+	pcr_ops->write_pcr(pcr_index, cpuc->pcr[pcr_index]);
 }
 
 static u64 sparc_perf_event_update(struct perf_event *event,