Messages in this thread Patch in this message | | | From | Madhavan Srinivasan <> | Subject | [PATCH v1 4/9]powerpc/powernv: Add generic nest pmu ops | Date | Tue, 2 Jun 2015 21:29:33 +0530 |
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Patch adds generic nest pmu functions and format attribute.
Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com> Cc: Stephane Eranian <eranian@google.com> Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com> --- arch/powerpc/perf/nest-pmu.c | 107 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 107 insertions(+)
diff --git a/arch/powerpc/perf/nest-pmu.c b/arch/powerpc/perf/nest-pmu.c index 3e7010e..345707c 100644 --- a/arch/powerpc/perf/nest-pmu.c +++ b/arch/powerpc/perf/nest-pmu.c @@ -134,6 +134,113 @@ void cpumask_chip(void) cpu_notifier_register_done(); } +PMU_FORMAT_ATTR(event, "config:0-20"); +struct attribute *p8_nest_format_attrs[] = { + &format_attr_event.attr, + NULL, +}; + +struct attribute_group p8_nest_format_group = { + .name = "format", + .attrs = p8_nest_format_attrs, +}; + +int p8_nest_event_init(struct perf_event *event) +{ + int chip_id; + + if (event->attr.type != event->pmu->type) + return -ENOENT; + + /* Sampling not supported yet */ + if (event->hw.sample_period) + return -EINVAL; + + /* unsupported modes and filters */ + if (event->attr.exclude_user || + event->attr.exclude_kernel || + event->attr.exclude_hv || + event->attr.exclude_idle || + event->attr.exclude_host || + event->attr.exclude_guest || + event->attr.sample_period) /* no sampling */ + return -EINVAL; + + if (event->cpu < 0) + return -EINVAL; + + chip_id = topology_physical_package_id(event->cpu); + event->hw.event_base = event->attr.config + + p8_perchip_nest_info[chip_id].vbase; + + return 0; +} + +void p8_nest_read_counter(struct perf_event *event) +{ + u64 *addr; + u64 data = 0; + + addr = (u64 *)event->hw.event_base; + data = __be64_to_cpu((uint64_t)*addr); + local64_set(&event->hw.prev_count, data); +} + +void p8_nest_perf_event_update(struct perf_event *event) +{ + u64 counter_prev, counter_new, final_count; + uint64_t *addr; + + addr = (u64 *)event->hw.event_base; + counter_prev = local64_read(&event->hw.prev_count); + counter_new = __be64_to_cpu((uint64_t)*addr); + final_count = counter_new - counter_prev; + + local64_set(&event->hw.prev_count, counter_new); + local64_add(final_count, &event->count); +} + +void p8_nest_event_start(struct perf_event *event, int flags) +{ + event->hw.state = 0; + p8_nest_read_counter(event); +} + +void p8_nest_event_stop(struct perf_event *event, int flags) +{ + p8_nest_perf_event_update(event); +} + +int p8_nest_event_add(struct perf_event *event, int flags) +{ + p8_nest_event_start(event, flags); + return 0; +} + +void p8_nest_event_del(struct perf_event *event, int flags) +{ + p8_nest_event_stop(event, flags); +} + +/* + * Populate pmu ops in the structure + */ +static int update_pmu_ops(struct nest_pmu *pmu) +{ + if (!pmu) + return -EINVAL; + + pmu->pmu.task_ctx_nr = perf_invalid_context; + pmu->pmu.event_init = p8_nest_event_init; + pmu->pmu.add = p8_nest_event_add; + pmu->pmu.del = p8_nest_event_del; + pmu->pmu.start = p8_nest_event_start; + pmu->pmu.stop = p8_nest_event_stop; + pmu->pmu.read = p8_nest_perf_event_update; + pmu->pmu.attr_groups = pmu->attr_groups; + + return 0; +} static int __init nest_pmu_init(void) { -- 1.9.1
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