diff options
Diffstat (limited to 'arch/x86/events/intel/p4.c')
| -rw-r--r-- | arch/x86/events/intel/p4.c | 37 |
1 files changed, 27 insertions, 10 deletions
diff --git a/arch/x86/events/intel/p4.c b/arch/x86/events/intel/p4.c index 7951a5dc73b6..03bbcc2fa2ff 100644 --- a/arch/x86/events/intel/p4.c +++ b/arch/x86/events/intel/p4.c @@ -1006,6 +1006,29 @@ static void p4_pmu_enable_all(int added) } } +static int p4_pmu_set_period(struct perf_event *event) +{ + struct hw_perf_event *hwc = &event->hw; + s64 left = this_cpu_read(pmc_prev_left[hwc->idx]); + int ret; + + ret = x86_perf_event_set_period(event); + + if (hwc->event_base) { + /* + * This handles erratum N15 in intel doc 249199-029, + * the counter may not be updated correctly on write + * so we need a second write operation to do the trick + * (the official workaround didn't work) + * + * the former idea is taken from OProfile code + */ + wrmsrl(hwc->event_base, (u64)(-left) & x86_pmu.cntval_mask); + } + + return ret; +} + static int p4_pmu_handle_irq(struct pt_regs *regs) { struct perf_sample_data data; @@ -1044,7 +1067,7 @@ static int p4_pmu_handle_irq(struct pt_regs *regs) /* event overflow for sure */ perf_sample_data_init(&data, 0, hwc->last_period); - if (!x86_perf_event_set_period(event)) + if (!static_call(x86_pmu_set_period)(event)) continue; @@ -1316,6 +1339,9 @@ static __initconst const struct x86_pmu p4_pmu = { .enable_all = p4_pmu_enable_all, .enable = p4_pmu_enable_event, .disable = p4_pmu_disable_event, + + .set_period = p4_pmu_set_period, + .eventsel = MSR_P4_BPU_CCCR0, .perfctr = MSR_P4_BPU_PERFCTR0, .event_map = p4_pmu_event_map, @@ -1334,15 +1360,6 @@ static __initconst const struct x86_pmu p4_pmu = { .max_period = (1ULL << (ARCH_P4_CNTRVAL_BITS - 1)) - 1, .hw_config = p4_hw_config, .schedule_events = p4_pmu_schedule_events, - /* - * This handles erratum N15 in intel doc 249199-029, - * the counter may not be updated correctly on write - * so we need a second write operation to do the trick - * (the official workaround didn't work) - * - * the former idea is taken from OProfile code - */ - .perfctr_second_write = 1, .format_attrs = intel_p4_formats_attr, }; |