From: Madhavan Srinivasan Date: Sun, 9 Dec 2018 09:18:15 +0000 (+0530) Subject: powerpc/perf: Fix thresholding counter data for unknown type X-Git-Tag: v5.4-rc1~1965^2~103 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=17cfccc91545682513541924245abb876d296063;p=platform%2Fkernel%2Flinux-rpi.git powerpc/perf: Fix thresholding counter data for unknown type MMCRA[34:36] and MMCRA[38:44] expose the thresholding counter value. Thresholding counter can be used to count latency cycles such as load miss to reload. But threshold counter value is not relevant when the sampled instruction type is unknown or reserved. Patch to fix the thresholding counter value to zero when sampled instruction type is unknown or reserved. Fixes: 170a315f41c6('powerpc/perf: Support to export MMCRA[TEC*] field to userspace') Signed-off-by: Madhavan Srinivasan Signed-off-by: Michael Ellerman --- diff --git a/arch/powerpc/perf/isa207-common.c b/arch/powerpc/perf/isa207-common.c index 177de81..6a2f65d 100644 --- a/arch/powerpc/perf/isa207-common.c +++ b/arch/powerpc/perf/isa207-common.c @@ -226,8 +226,13 @@ void isa207_get_mem_weight(u64 *weight) u64 mmcra = mfspr(SPRN_MMCRA); u64 exp = MMCRA_THR_CTR_EXP(mmcra); u64 mantissa = MMCRA_THR_CTR_MANT(mmcra); + u64 sier = mfspr(SPRN_SIER); + u64 val = (sier & ISA207_SIER_TYPE_MASK) >> ISA207_SIER_TYPE_SHIFT; - *weight = mantissa << (2 * exp); + if (val == 0 || val == 7) + *weight = 0; + else + *weight = mantissa << (2 * exp); } int isa207_get_constraint(u64 event, unsigned long *maskp, unsigned long *valp)