linux-kernel - [PATCH v5 8/9] perf/x86/rapl: Move the cntr_mask to rapl

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Message-ID: <20240913154801.6446-5-Dhananjay.Ugwekar@amd.com>
Date: Fri, 13 Sep 2024 15:48:00 +0000
From: Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>
To: <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
	<namhyung@...nel.org>, <mark.rutland@....com>,
	<alexander.shishkin@...ux.intel.com>, <jolsa@...nel.org>,
	<irogers@...gle.com>, <adrian.hunter@...el.com>, <kan.liang@...ux.intel.com>,
	<tglx@...utronix.de>, <bp@...en8.de>, <dave.hansen@...ux.intel.com>,
	<x86@...nel.org>, <hpa@...or.com>, <rui.zhang@...el.com>,
	<oleksandr@...alenko.name>
CC: <eranian@...gle.com>, <gautham.shenoy@....com>, <ravi.bangoria@....com>,
	<linux-perf-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	"Dhananjay Ugwekar" <Dhananjay.Ugwekar@....com>
Subject: [PATCH v5 8/9] perf/x86/rapl: Move the cntr_mask to rapl_pmus struct

Preparation for the addition of per-core RAPL energy counter for AMD
CPUs.

Moving cntr_mask to rapl_pmus struct instead of adding a new global
cntr_mask for the per-core RAPL energy counter, will ensure that the
"per_core_cntr_mask" is only created if needed (i.e. in case of AMD
CPUs).

Signed-off-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>
---
 arch/x86/events/rapl.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/arch/x86/events/rapl.c b/arch/x86/events/rapl.c
index bfd8bbcc1421..7e9cb01f749a 100644
--- a/arch/x86/events/rapl.c
+++ b/arch/x86/events/rapl.c
@@ -116,6 +116,7 @@ struct rapl_pmu {
 struct rapl_pmus {
 	struct pmu		pmu;
 	unsigned int		nr_rapl_pmu;
+	unsigned int		cntr_mask;
 	struct rapl_pmu		*rapl_pmu[] __counted_by(nr_rapl_pmu);
 };
 
@@ -135,7 +136,6 @@ struct rapl_model {
  /* 1/2^hw_unit Joule */
 static int rapl_pkg_hw_unit[NR_RAPL_PKG_DOMAINS] __read_mostly;
 static struct rapl_pmus *rapl_pmus_pkg;
-static unsigned int rapl_pkg_cntr_mask;
 static u64 rapl_timer_ms;
 static struct rapl_model *rapl_model;
 
@@ -358,7 +358,7 @@ static int rapl_pmu_event_init(struct perf_event *event)
 	bit = cfg - 1;
 
 	/* check event supported */
-	if (!(rapl_pkg_cntr_mask & (1 << bit)))
+	if (!(rapl_pmus_pkg->cntr_mask & (1 << bit)))
 		return -EINVAL;
 
 	/* unsupported modes and filters */
@@ -586,10 +586,10 @@ static void __init rapl_advertise(void)
 	int i;
 
 	pr_info("API unit is 2^-32 Joules, %d fixed counters, %llu ms ovfl timer\n",
-		hweight32(rapl_pkg_cntr_mask), rapl_timer_ms);
+		hweight32(rapl_pmus_pkg->cntr_mask), rapl_timer_ms);
 
 	for (i = 0; i < NR_RAPL_PKG_DOMAINS; i++) {
-		if (rapl_pkg_cntr_mask & (1 << i)) {
+		if (rapl_pmus_pkg->cntr_mask & (1 << i)) {
 			pr_info("hw unit of domain %s 2^-%d Joules\n",
 				rapl_pkg_domain_names[i], rapl_pkg_hw_unit[i]);
 		}
@@ -812,9 +812,6 @@ static int __init rapl_pmu_init(void)
 
 	rapl_model = (struct rapl_model *) id->driver_data;
 
-	rapl_pkg_cntr_mask = perf_msr_probe(rapl_model->rapl_pkg_msrs, PERF_RAPL_PKG_EVENTS_MAX,
-					false, (void *) &rapl_model->pkg_events);
-
 	ret = rapl_check_hw_unit();
 	if (ret)
 		return ret;
@@ -823,6 +820,10 @@ static int __init rapl_pmu_init(void)
 	if (ret)
 		return ret;
 
+	rapl_pmus_pkg->cntr_mask = perf_msr_probe(rapl_model->rapl_pkg_msrs,
+						  PERF_RAPL_PKG_EVENTS_MAX, false,
+						  (void *) &rapl_model->pkg_events);
+
 	ret = perf_pmu_register(&rapl_pmus_pkg->pmu, "power", -1);
 	if (ret)
 		goto out;
-- 
2.34.1