linux-kernel - [PATCHv2] Support for perf on AMD family17h processors

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Date:   Thu, 17 Nov 2016 10:15:06 -0600
From:   Janakarajan Natarajan <Janakarajan.Natarajan@....com>
To:     <linux-kernel@...r.kernel.org>
CC:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        Janakarajan Natarajan <Janakarajan.Natarajan@....com>
Subject: [PATCHv2] Support for perf on AMD family17h processors

This patch enables perf core PMU support for AMD family17h processors. In
family17h, there is no PMC-event constraint. All events, irrespective of
the type, can be measured using any of the performance counters.

Signed-off-by: Janakarajan Natarajan <Janakarajan.Natarajan@....com>
---

v1->v2

* Removed renaming of amd_core_pmu_init and associated comment.
* Changed comment style to follow guidelines.

 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;
-- 
2.7.4