diff options
author | David S. Miller <davem@davemloft.net> | 2012-08-17 03:29:05 -0700 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2012-08-18 23:26:21 -0700 |
commit | 7a37a0b8f8df0872932cf8373b21b5e14a92a794 (patch) | |
tree | 5b7bbd1802f2b81cbc8a3d4b1f866cb5102cc69c /arch | |
parent | b4f061a4b8cbf947de4fa816a1cfc53960da218e (diff) |
sparc64: Support perf event encoding for multi-PCR PMUs.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/sparc/kernel/perf_event.c | 98 |
1 files changed, 75 insertions, 23 deletions
diff --git a/arch/sparc/kernel/perf_event.c b/arch/sparc/kernel/perf_event.c index c3ad63775ff9..64415922a28f 100644 --- a/arch/sparc/kernel/perf_event.c +++ b/arch/sparc/kernel/perf_event.c @@ -710,18 +710,10 @@ static int sparc_perf_event_set_period(struct perf_event *event, return ret; } -/* If performance event entries have been added, move existing - * events around (if necessary) and then assign new entries to - * counters. - */ -static u64 maybe_change_configuration(struct cpu_hw_events *cpuc, u64 pcr) +static void read_in_all_counters(struct cpu_hw_events *cpuc) { int i; - if (!cpuc->n_added) - goto out; - - /* Read in the counters which are moving. */ for (i = 0; i < cpuc->n_events; i++) { struct perf_event *cp = cpuc->event[i]; @@ -732,6 +724,20 @@ static u64 maybe_change_configuration(struct cpu_hw_events *cpuc, u64 pcr) cpuc->current_idx[i] = PIC_NO_INDEX; } } +} + +/* On this PMU all PICs are programmed using a single PCR. Calculate + * the combined control register value. + * + * For such chips we require that all of the events have the same + * configuration, so just fetch the settings from the first entry. + */ +static void calculate_single_pcr(struct cpu_hw_events *cpuc) +{ + int i; + + if (!cpuc->n_added) + goto out; /* Assign to counters all unassigned events. */ for (i = 0; i < cpuc->n_events; i++) { @@ -747,19 +753,71 @@ static u64 maybe_change_configuration(struct cpu_hw_events *cpuc, u64 pcr) cpuc->current_idx[i] = idx; enc = perf_event_get_enc(cpuc->events[i]); - pcr &= ~mask_for_index(idx); + cpuc->pcr[0] &= ~mask_for_index(idx); if (hwc->state & PERF_HES_STOPPED) - pcr |= nop_for_index(idx); + cpuc->pcr[0] |= nop_for_index(idx); else - pcr |= event_encoding(enc, idx); + cpuc->pcr[0] |= event_encoding(enc, idx); } out: - return pcr; + cpuc->pcr[0] |= cpuc->event[0]->hw.config_base; +} + +/* On this PMU each PIC has it's own PCR control register. */ +static void calculate_multiple_pcrs(struct cpu_hw_events *cpuc) +{ + int i; + + if (!cpuc->n_added) + goto out; + + for (i = 0; i < cpuc->n_events; i++) { + struct perf_event *cp = cpuc->event[i]; + struct hw_perf_event *hwc = &cp->hw; + int idx = hwc->idx; + u64 enc; + + if (cpuc->current_idx[i] != PIC_NO_INDEX) + continue; + + sparc_perf_event_set_period(cp, hwc, idx); + cpuc->current_idx[i] = idx; + + enc = perf_event_get_enc(cpuc->events[i]); + cpuc->pcr[idx] &= ~mask_for_index(idx); + if (hwc->state & PERF_HES_STOPPED) + cpuc->pcr[idx] |= nop_for_index(idx); + else + cpuc->pcr[idx] |= event_encoding(enc, idx); + } +out: + for (i = 0; i < cpuc->n_events; i++) { + struct perf_event *cp = cpuc->event[i]; + int idx = cp->hw.idx; + + cpuc->pcr[idx] |= cp->hw.config_base; + } +} + +/* If performance event entries have been added, move existing events + * around (if necessary) and then assign new entries to counters. + */ +static void update_pcrs_for_enable(struct cpu_hw_events *cpuc) +{ + if (cpuc->n_added) + read_in_all_counters(cpuc); + + if (sparc_pmu->num_pcrs == 1) { + calculate_single_pcr(cpuc); + } else { + calculate_multiple_pcrs(cpuc); + } } static void sparc_pmu_enable(struct pmu *pmu) { struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events); + int i; if (cpuc->enabled) return; @@ -767,17 +825,11 @@ static void sparc_pmu_enable(struct pmu *pmu) cpuc->enabled = 1; barrier(); - if (cpuc->n_events) { - u64 pcr = maybe_change_configuration(cpuc, cpuc->pcr[0]); - - /* We require that all of the events have the same - * configuration, so just fetch the settings from the - * first entry. - */ - cpuc->pcr[0] = pcr | cpuc->event[0]->hw.config_base; - } + if (cpuc->n_events) + update_pcrs_for_enable(cpuc); - pcr_ops->write_pcr(0, cpuc->pcr[0]); + for (i = 0; i < sparc_pmu->num_pcrs; i++) + pcr_ops->write_pcr(i, cpuc->pcr[i]); } static void sparc_pmu_disable(struct pmu *pmu) |