linux-kernel - [PATCH 1/1] perf, x86: bug fix for cycles:p and cycles:pp on SLM

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Message-Id: <1418048863-4294-1-git-send-email-kan.liang@intel.com>
Date:	Mon,  8 Dec 2014 06:27:43 -0800
From:	kan.liang@...el.com
To:	a.p.zijlstra@...llo.nl
Cc:	linux-kernel@...r.kernel.org, ak@...ux.intel.com,
	Kan Liang <kan.liang@...el.com>
Subject: [PATCH 1/1] perf, x86: bug fix for cycles:p and cycles:pp on SLM

From: Kan Liang <kan.liang@...el.com>

cycles:p and cycles:pp don't work on SLM since 86a0446

This regression issue is because UOPS_RETIRED.ALL is not a PEBS event on SLM.

According to pebs_aliases, INST_RETIRED.ANY_P (a PEBS capable event) can be
used as an alternative way to count cycles. Roll back the pebs_constraints to
use INST_RETIRED.ANY_P.

Signed-off-by: Kan Liang <kan.liang@...el.com>
---
 arch/x86/kernel/cpu/perf_event_intel_ds.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c
index 3c895d4..ac8f941 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_ds.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c
@@ -568,8 +568,8 @@ struct event_constraint intel_atom_pebs_event_constraints[] = {
 };
 
 struct event_constraint intel_slm_pebs_event_constraints[] = {
-	/* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */
-	INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c2, 0xf),
+	/* INST_RETIRED.ANY_P */
+	INTEL_UEVENT_CONSTRAINT(0x00c0, 0x1),
 	/* Allow all events as PEBS with no flags */
 	INTEL_ALL_EVENT_CONSTRAINT(0, 0x1),
 	EVENT_CONSTRAINT_END
-- 
1.8.3.1

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