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.
Cc: Peter Zijlstra <a.p.zijls...@chello.nl>
Cc: Vineet Gupta <vgu...@synopsys.com>
Signed-off-by: Mischa Jonker <mjon...@synopsys.com>
---
arch/arc/kernel/perf_event.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/arc/kernel/perf_event.c b/arch/arc/kernel/perf_event.c
index 759e5f3..e46d81f 100644
--- a/arch/arc/kernel/perf_event.c
+++ b/arch/arc/kernel/perf_event.c
@@ -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)
--
1.7.9.5
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