linux-kernel - [PATCH] x86/events: add event map for AMD Family 17h

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Date:   Thu, 21 Mar 2019 21:15:22 +0000
From:   "Phillips, Kim" <kim.phillips@....com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "Natarajan, Janakarajan" <Janakarajan.Natarajan@....com>,
        "Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com>,
        Martin Liška <mliska@...e.cz>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, Pu Wen <puwen@...on.cn>,
        "x86@...nel.org" <x86@...nel.org>
Subject: [PATCH] x86/events: add event map for AMD Family 17h

From: Kim Phillips <kim.phillips@....com>

Family 17h differs from prior families by:
 - not supporting an L2 cache miss event
 - having re-enumerated PMC counters for:
   - L2 cache references
   - front & back end stalled cycles

So we add a new amd_f17h_perfmon_event_map so that the generic
perf event names will resolve to the correct h/w events on
family 17h and above processors.

Reference sections 2.1.13.3.3 (stalls) and 2.1.13.3.6 (L2):
https://www.amd.com/system/files/TechDocs/54945_PPR_Family_17h_Models_00h-0Fh.pdf

Fixes: e40ed1542dd7 ("perf/x86: Add perf support for AMD family-17h processors")
Signed-off-by: Kim Phillips <kim.phillips@....com>
Cc: Janakarajan Natarajan <Janakarajan.Natarajan@....com>
Cc: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Cc: Martin Liška <mliska@...e.cz>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Borislav Petkov <bp@...en8.de>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Pu Wen <puwen@...on.cn>
Cc: x86@...nel.org
Cc: linux-kernel@...r.kernel.org
---
 arch/x86/events/amd/core.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/x86/events/amd/core.c b/arch/x86/events/amd/core.c
index 7d2d7c801dba..764d181afa18 100644
--- a/arch/x86/events/amd/core.c
+++ b/arch/x86/events/amd/core.c
@@ -127,8 +127,25 @@ static const u64 amd_perfmon_event_map[PERF_COUNT_HW_MAX] =
   [PERF_COUNT_HW_STALLED_CYCLES_BACKEND]	= 0x00d1, /* "Dispatch stalls" event */
 };
 
+/*
+ * AMD Performance Monitor Family 17h
+ */
+static const u64 amd_f17h_perfmon_event_map[PERF_COUNT_HW_MAX] =
+{
+  [PERF_COUNT_HW_CPU_CYCLES]			= 0x0076,
+  [PERF_COUNT_HW_INSTRUCTIONS]			= 0x00c0,
+  [PERF_COUNT_HW_CACHE_REFERENCES]		= 0xff60,
+  [PERF_COUNT_HW_BRANCH_INSTRUCTIONS]		= 0x00c2,
+  [PERF_COUNT_HW_BRANCH_MISSES]			= 0x00c3,
+  [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND]	= 0x0287,
+  [PERF_COUNT_HW_STALLED_CYCLES_BACKEND]	= 0x0187,
+};
+
 static u64 amd_pmu_event_map(int hw_event)
 {
+	if (boot_cpu_data.x86 >= 0x17)
+		return amd_f17h_perfmon_event_map[hw_event];
+
 	return amd_perfmon_event_map[hw_event];
 }
 
-- 
2.21.0