Messages in this thread Patch in this message | | | From | Vince Weaver <> | Date | Sun, 15 Jun 2014 02:03:13 -0400 (EDT) | Subject | [PATCH 3/6] metag,perf: Use common PMU interrupt disabled code |
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Transition to using the new generic PERF_PMU_CAP_NO_INTERRUPT method for failing a sampling event when no PMU interrupt is available.
Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
diff --git a/arch/metag/kernel/perf/perf_event.c b/arch/metag/kernel/perf/perf_event.c index 5cc4d4d..02c0873 100644 --- a/arch/metag/kernel/perf/perf_event.c +++ b/arch/metag/kernel/perf/perf_event.c @@ -568,16 +568,6 @@ static int _hw_perf_event_init(struct perf_event *event) return -EINVAL; /* - * Early cores have "limited" counters - they have no overflow - * interrupts - and so are unable to do sampling without extra work - * and timer assistance. - */ - if (metag_pmu->max_period == 0) { - if (hwc->sample_period) - return -EINVAL; - } - - /* * Don't assign an index until the event is placed into the hardware. * -1 signifies that we're still deciding where to put it. On SMP * systems each core has its own set of counters, so we can't do any @@ -866,6 +856,15 @@ static int __init init_hw_perf_events(void) pr_info("enabled with %s PMU driver, %d counters available\n", metag_pmu->name, metag_pmu->max_events); + /* + * Early cores have "limited" counters - they have no overflow + * interrupts - and so are unable to do sampling without extra work + * and timer assistance. + */ + if (metag_pmu->max_period == 0) { + metag_pmu->pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT; + } + /* Initialise the active events and reservation mutex */ atomic_set(&metag_pmu->active_events, 0); mutex_init(&metag_pmu->reserve_mutex);
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