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

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,