linux-kernel - [PATCH V2 1/2] perf/x86/intel: Fix the checking for instruction event

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Message-Id: <1554922629-126287-2-git-send-email-kan.liang@linux.intel.com>
Date:   Wed, 10 Apr 2019 11:57:08 -0700
From:   kan.liang@...ux.intel.com
To:     peterz@...radead.org, mingo@...hat.com,
        linux-kernel@...r.kernel.org
Cc:     tglx@...utronix.de, acme@...nel.org, jolsa@...nel.org,
        eranian@...gle.com, alexander.shishkin@...ux.intel.com,
        ak@...ux.intel.com, Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH V2 1/2] perf/x86/intel: Fix the checking for instruction event

From: Kan Liang <kan.liang@...ux.intel.com>

Some bits must be masked before checking X86_CONFIG(.event=0xc0), e.g.
ARCH_PERFMON_EVENTSEL_INT, ARCH_PERFMON_EVENTSEL_USR and
ARCH_PERFMON_EVENTSEL_OS. Those bits will be set in hw_config().
Otherwise the condition will never be met.

Other fields, e.g the INV, ANY, E, or CMASK fields are not allowed for
the reduced Skid PEBS.

Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
---

New patch to fix a bug on top of Icelake V5 patch series
(with Peter's cleanup patch).

The patch may be merged back into:

  Subject: perf/x86/intel: Add Icelake support

 arch/x86/events/intel/core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index f34d92b..34220ab 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -3421,6 +3421,9 @@ hsw_get_event_constraints(struct cpu_hw_events *cpuc, int idx,
 	return c;
 }
 
+#define EVENT_CONFIG(config)		\
+	(config & (X86_ALL_EVENT_FLAGS | INTEL_ARCH_EVENT_MASK))
+
 static struct event_constraint *
 icl_get_event_constraints(struct cpu_hw_events *cpuc, int idx,
 			  struct perf_event *event)
@@ -3430,7 +3433,7 @@ icl_get_event_constraints(struct cpu_hw_events *cpuc, int idx,
 	 * Force instruction:ppp in Fixed counter 0
 	 */
 	if ((event->attr.precise_ip == 3) &&
-	    (event->hw.config == X86_CONFIG(.event=0xc0)))
+	    (EVENT_CONFIG(event->hw.config) == X86_CONFIG(.event=0xc0)))
 		return &fixed_counter0_constraint;
 
 	return hsw_get_event_constraints(cpuc, idx, event);
-- 
2.7.4