linux-kernel - [tip:perf/urgent] perf/x86: Add perf support for AMD family-17h processors

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Message-ID: <tip-e40ed1542dd779e5037a22c6b534e57127472365@git.kernel.org>
Date:   Fri, 18 Nov 2016 01:06:28 -0800
From:   tip-bot for Janakarajan Natarajan <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, jolsa@...hat.com, torvalds@...ux-foundation.org,
        Janakarajan.Natarajan@....com, alexander.shishkin@...ux.intel.com,
        peterz@...radead.org, suravee.suthikulpanit@....com, hpa@...or.com,
        eranian@...gle.com, acme@...hat.com, linux-kernel@...r.kernel.org,
        tglx@...utronix.de, vincent.weaver@...ne.edu, acme@...nel.org,
        bp@...e.de
Subject: [tip:perf/urgent] perf/x86: Add perf support for AMD family-17h
 processors

Commit-ID:  e40ed1542dd779e5037a22c6b534e57127472365
Gitweb:     http://git.kernel.org/tip/e40ed1542dd779e5037a22c6b534e57127472365
Author:     Janakarajan Natarajan <Janakarajan.Natarajan@....com>
AuthorDate: Thu, 17 Nov 2016 10:15:06 -0600
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 18 Nov 2016 09:45:57 +0100

perf/x86: Add perf support for AMD family-17h processors

This patch enables perf core PMU support for the new AMD family-17h processors.

In family-17h, there is no PMC-event constraint. All events, irrespective of
the type, can be measured using any of the six generic performance counters.

Signed-off-by: Janakarajan Natarajan <Janakarajan.Natarajan@....com>
Acked-by: Borislav Petkov <bp@...e.de>
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: Jiri Olsa <jolsa@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Vince Weaver <vincent.weaver@...ne.edu>
Link: http://lkml.kernel.org/r/1479399306-13375-1-git-send-email-Janakarajan.Natarajan@amd.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/events/amd/core.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/x86/events/amd/core.c b/arch/x86/events/amd/core.c
index f5f4b3f..afb222b 100644
--- a/arch/x86/events/amd/core.c
+++ b/arch/x86/events/amd/core.c
@@ -662,7 +662,13 @@ static int __init amd_core_pmu_init(void)
 		pr_cont("Fam15h ");
 		x86_pmu.get_event_constraints = amd_get_event_constraints_f15h;
 		break;
-
+	case 0x17:
+		pr_cont("Fam17h ");
+		/*
+		 * In family 17h, there are no event constraints in the PMC hardware.
+		 * We fallback to using default amd_get_event_constraints.
+		 */
+		break;
 	default:
 		pr_err("core perfctr but no constraints; unknown hardware!\n");
 		return -ENODEV;