linux-kernel - [PATCH] perf/x86/intel/rapl: Add support for Knights Landing (KNL)

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Message-Id: <aa63b4a3af3160152fea1a10c807f4200527280c.1432665809.git.dasaratharaman.chandramouli@intel.com>
Date:	Tue, 26 May 2015 11:47:39 -0700
From:	Dasaratharaman Chandramouli 
	<dasaratharaman.chandramouli@...el.com>
To:	Jacob Pan Jun <jacob.jun.pan@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	Dasaratharaman Chandramouli 
	<dasaratharaman.chandramouli@...el.com>,
	Nikhil Rao <nikhil.rao@...el.com>
Subject: [PATCH] perf/x86/intel/rapl: Add support for Knights Landing (KNL)

Knights Landing DRAM RAPL supports PKG and DRAM RAPL domains.
DRAM RAPL has a different fixed energy unit (2^-16J) similar to
that of HSW.

Signed-off-by: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@...el.com>
---
 arch/x86/kernel/cpu/perf_event_intel_rapl.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/x86/kernel/cpu/perf_event_intel_rapl.c b/arch/x86/kernel/cpu/perf_event_intel_rapl.c
index 999289b9..96633fb 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_rapl.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_rapl.c
@@ -86,6 +86,10 @@ static const char *rapl_domain_names[NR_RAPL_DOMAINS] __initconst = {
 			 1<<RAPL_IDX_RAM_NRG_STAT|\
 			 1<<RAPL_IDX_PP1_NRG_STAT)
 
+/* Knights Landing has PKG, RAM */
+#define RAPL_IDX_KNL	(1<<RAPL_IDX_PKG_NRG_STAT|\
+			 1<<RAPL_IDX_RAM_NRG_STAT)
+
 /*
  * event code: LSB 8 bits, passed in attr->config
  * any other bit is reserved
@@ -487,6 +491,18 @@ static struct attribute *rapl_events_hsw_attr[] = {
 	NULL,
 };
 
+static struct attribute *rapl_events_knl_attr[] = {
+	EVENT_PTR(rapl_pkg),
+	EVENT_PTR(rapl_ram),
+
+	EVENT_PTR(rapl_pkg_unit),
+	EVENT_PTR(rapl_ram_unit),
+
+	EVENT_PTR(rapl_pkg_scale),
+	EVENT_PTR(rapl_ram_scale),
+	NULL,
+};
+
 static struct attribute_group rapl_pmu_events_group = {
 	.name = "events",
 	.attrs = NULL, /* patched at runtime */
@@ -730,6 +746,10 @@ static int __init rapl_pmu_init(void)
 		rapl_cntr_mask = RAPL_IDX_SRV;
 		rapl_pmu_events_group.attrs = rapl_events_srv_attr;
 		break;
+	case 87: /* Knights Landing */
+		rapl_add_quirk(rapl_hsw_server_quirk);
+		rapl_cntr_mask = RAPL_IDX_KNL;
+		rapl_pmu_events_group.attrs = rapl_events_knl_attr;
 
 	default:
 		/* unsupported */
-- 
1.8.1.5

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