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ARC: perf: ARC 700 PMU doesn't support sampling events

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The ARC 700 does not have an interrupt associated with it, and as
such it cannot trigger when a counter overflows. As the counters are
48 bit, it will usually take at least 100 days before a counter
overflows, so for mere counting of events, there is no problem.
Sampling is not supported though.

Signed-off-by: Mischa Jonker <[email protected]>
Acked-by: Peter Zijlstra <[email protected]>
Signed-off-by: Vineet Gupta <[email protected]>
This commit is contained in:
Mischa Jonker 2013-11-13 16:06:06 +01:00 • committed by Vineet Gupta
commit 230c4aadcc
1 changed files with 4 additions and 0 deletions
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4
arch/arc/kernel/perf_event.c
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@ -99,6 +99,10 @@ static int arc_pmu_event_init(struct perf_event *event)
struct hw_perf_event *hwc = &event->hw;
int ret;
/* ARC 700 PMU does not support sampling events */
if (is_sampling_event(event))
return -ENOENT;
switch (event->attr.type) {
case PERF_TYPE_HARDWARE:
if (event->attr.config >= PERF_COUNT_HW_MAX)