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authorMischa Jonker2013-11-13 16:06:06 +0100
committerVineet Gupta2013-11-15 10:52:28 +0530
commit230c4aadcc394fb48d865a1cd96c8725dabad56d (patch)
treefb4a4e81cd6a6b90733081b92eef6d6e6603902e /arch/arc
parentd6a7f73db712a11b1c30b2566758de65b308da73 (diff)
ARC: perf: ARC 700 PMU doesn't support sampling events
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 <mjonker@synopsys.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc')
-rw-r--r--arch/arc/kernel/perf_event.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arc/kernel/perf_event.c b/arch/arc/kernel/perf_event.c
index 759e5f3e9029..e46d81f70979 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)