From e9aaac1ac39f58a897e9b71e153317c8c216cb21 Mon Sep 17 00:00:00 2001 From: Michael Ellerman Date: Fri, 14 Mar 2014 16:00:45 +1100 Subject: [PATCH] powerpc/perf: Fix handling of L3 events with bank == 1 Currently we reject events which have the L3 bank == 1, such as 0x000084918F, because the cache field is non-zero. However that is incorrect, because although the bank is non-zero, the value we would write into MMCRC is zero, and so we can count the event. So fix the check to ignore the bank selector when checking whether the cache selector is non-zero. Signed-off-by: Michael Ellerman Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/perf/power8-pmu.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/perf/power8-pmu.c b/arch/powerpc/perf/power8-pmu.c index 3ad363da05f6..fe2763b6e039 100644 --- a/arch/powerpc/perf/power8-pmu.c +++ b/arch/powerpc/perf/power8-pmu.c @@ -325,9 +325,10 @@ static int power8_get_constraint(u64 event, unsigned long *maskp, unsigned long * HV writable, and there is no API for guest kernels to modify * it. The solution is for the hypervisor to initialise the * field to zeroes, and for us to only ever allow events that - * have a cache selector of zero. + * have a cache selector of zero. The bank selector (bit 3) is + * irrelevant, as long as the rest of the value is 0. */ - if (cache) + if (cache & 0x7) return -1; } else if (event & EVENT_IS_L1) { -- 2.39.5