linux-kernel - [tip:perf/core] perf/x86/amd/uncore: Set ThreadMask and SliceMask for L3 Cache perf events

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Message-ID: <tip-d7cbbe49a9304520181fb8c9272d1327deec8453@git.kernel.org>
Date:   Tue, 2 Oct 2018 03:02:32 -0700
From:   "tip-bot for Natarajan, Janakarajan" <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     namhyung@...nel.org, alexander.shishkin@...ux.intel.com,
        bp@...en8.de, acme@...nel.org, jolsa@...hat.com,
        torvalds@...ux-foundation.org, acme@...hat.com, tglx@...utronix.de,
        peterz@...radead.org, mingo@...nel.org, vincent.weaver@...ne.edu,
        hpa@...or.com, Suravee.Suthikulpanit@....com,
        linux-kernel@...r.kernel.org, Janakarajan.Natarajan@....com,
        eranian@...gle.com
Subject: [tip:perf/core] perf/x86/amd/uncore: Set ThreadMask and SliceMask
 for L3 Cache perf events

Commit-ID:  d7cbbe49a9304520181fb8c9272d1327deec8453
Gitweb:     https://git.kernel.org/tip/d7cbbe49a9304520181fb8c9272d1327deec8453
Author:     Natarajan, Janakarajan <Janakarajan.Natarajan@....com>
AuthorDate: Thu, 27 Sep 2018 15:51:55 +0000
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 2 Oct 2018 09:38:04 +0200

perf/x86/amd/uncore: Set ThreadMask and SliceMask for L3 Cache perf events

In Family 17h, some L3 Cache Performance events require the ThreadMask
and SliceMask to be set. For other events, these fields do not affect
the count either way.

Set ThreadMask and SliceMask to 0xFF and 0xF respectively.

Signed-off-by: Janakarajan Natarajan <Janakarajan.Natarajan@....com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: H . Peter Anvin <hpa@...or.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Suravee <Suravee.Suthikulpanit@....com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Vince Weaver <vincent.weaver@...ne.edu>
Link: http://lkml.kernel.org/r/Message-ID:
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/events/amd/uncore.c      | 10 ++++++++++
 arch/x86/include/asm/perf_event.h |  8 ++++++++
 2 files changed, 18 insertions(+)

diff --git a/arch/x86/events/amd/uncore.c b/arch/x86/events/amd/uncore.c
index 981ba5e8241b..8671de126eac 100644
--- a/arch/x86/events/amd/uncore.c
+++ b/arch/x86/events/amd/uncore.c
@@ -36,6 +36,7 @@
 
 static int num_counters_llc;
 static int num_counters_nb;
+static bool l3_mask;
 
 static HLIST_HEAD(uncore_unused_list);
 
@@ -209,6 +210,13 @@ static int amd_uncore_event_init(struct perf_event *event)
 	hwc->config = event->attr.config & AMD64_RAW_EVENT_MASK_NB;
 	hwc->idx = -1;
 
+	/*
+	 * SliceMask and ThreadMask need to be set for certain L3 events in
+	 * Family 17h. For other events, the two fields do not affect the count.
+	 */
+	if (l3_mask)
+		hwc->config |= (AMD64_L3_SLICE_MASK | AMD64_L3_THREAD_MASK);
+
 	if (event->cpu < 0)
 		return -EINVAL;
 
@@ -525,6 +533,7 @@ static int __init amd_uncore_init(void)
 		amd_llc_pmu.name	  = "amd_l3";
 		format_attr_event_df.show = &event_show_df;
 		format_attr_event_l3.show = &event_show_l3;
+		l3_mask			  = true;
 	} else {
 		num_counters_nb		  = NUM_COUNTERS_NB;
 		num_counters_llc	  = NUM_COUNTERS_L2;
@@ -532,6 +541,7 @@ static int __init amd_uncore_init(void)
 		amd_llc_pmu.name	  = "amd_l2";
 		format_attr_event_df	  = format_attr_event;
 		format_attr_event_l3	  = format_attr_event;
+		l3_mask			  = false;
 	}
 
 	amd_nb_pmu.attr_groups	= amd_uncore_attr_groups_df;
diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h
index 12f54082f4c8..78241b736f2a 100644
--- a/arch/x86/include/asm/perf_event.h
+++ b/arch/x86/include/asm/perf_event.h
@@ -46,6 +46,14 @@
 #define INTEL_ARCH_EVENT_MASK	\
 	(ARCH_PERFMON_EVENTSEL_UMASK | ARCH_PERFMON_EVENTSEL_EVENT)
 
+#define AMD64_L3_SLICE_SHIFT				48
+#define AMD64_L3_SLICE_MASK				\
+	((0xFULL) << AMD64_L3_SLICE_SHIFT)
+
+#define AMD64_L3_THREAD_SHIFT				56
+#define AMD64_L3_THREAD_MASK				\
+	((0xFFULL) << AMD64_L3_THREAD_SHIFT)
+
 #define X86_RAW_EVENT_MASK		\
 	(ARCH_PERFMON_EVENTSEL_EVENT |	\
 	 ARCH_PERFMON_EVENTSEL_UMASK |	\