linux-kernel - [PATCH v7 06/10] perf/x86/rapl: Add arguments to the init and cleanup functions

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Message-ID: <20241115060805.447565-7-Dhananjay.Ugwekar@amd.com>
Date: Fri, 15 Nov 2024 06:08:02 +0000
From: Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>
To: <peterz@...radead.org>, <mingo@...hat.com>, <rui.zhang@...el.com>,
	<irogers@...gle.com>, <kan.liang@...ux.intel.com>, <tglx@...utronix.de>,
	<bp@...en8.dei>, <gautham.shenoy@....com>
CC: <kprateek.nayak@....com>, <ravi.bangoria@....com>, <x86@...nel.org>,
	<linux-perf-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	"Dhananjay Ugwekar" <Dhananjay.Ugwekar@....com>
Subject: [PATCH v7 06/10] perf/x86/rapl: Add arguments to the init and cleanup functions

Prepare for the addition of RAPL core energy counter support.

Add arguments to the init and cleanup functions, which will help in
initialization and cleaning up of two separate PMUs.

No functional change.

Signed-off-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@....com>
Reviewed-by: Zhang Rui <rui.zhang@...el.com>
Tested-by: Zhang Rui <rui.zhang@...el.com>
---
 arch/x86/events/rapl.c | 28 ++++++++++++++++------------
 1 file changed, 16 insertions(+), 12 deletions(-)

diff --git a/arch/x86/events/rapl.c b/arch/x86/events/rapl.c
index 0585e15caeab..f353008b860b 100644
--- a/arch/x86/events/rapl.c
+++ b/arch/x86/events/rapl.c
@@ -602,7 +602,7 @@ static void __init rapl_advertise(void)
 	}
 }
 
-static void cleanup_rapl_pmus(void)
+static void cleanup_rapl_pmus(struct rapl_pmus *rapl_pmus)
 {
 	int i;
 
@@ -620,7 +620,7 @@ static const struct attribute_group *rapl_attr_update[] = {
 	NULL,
 };
 
-static int __init init_rapl_pmu(void)
+static int __init init_rapl_pmu(struct rapl_pmus *rapl_pmus)
 {
 	struct rapl_pmu *rapl_pmu;
 	int idx;
@@ -646,20 +646,20 @@ static int __init init_rapl_pmu(void)
 	return -ENOMEM;
 }
 
-static int __init init_rapl_pmus(void)
+static int __init init_rapl_pmus(struct rapl_pmus **rapl_pmus_ptr, int rapl_pmu_scope)
 {
 	int nr_rapl_pmu = topology_max_packages();
-	int rapl_pmu_scope = PERF_PMU_SCOPE_PKG;
+	struct rapl_pmus *rapl_pmus;
 
-	if (!rapl_pmu_is_pkg_scope()) {
-		nr_rapl_pmu *= topology_max_dies_per_package();
-		rapl_pmu_scope = PERF_PMU_SCOPE_DIE;
-	}
+	if (rapl_pmu_scope == PERF_PMU_SCOPE_DIE)
+		nr_rapl_pmu	*= topology_max_dies_per_package();
 
 	rapl_pmus = kzalloc(struct_size(rapl_pmus, rapl_pmu, nr_rapl_pmu), GFP_KERNEL);
 	if (!rapl_pmus)
 		return -ENOMEM;
 
+	*rapl_pmus_ptr = rapl_pmus;
+
 	rapl_pmus->nr_rapl_pmu		= nr_rapl_pmu;
 	rapl_pmus->pmu.attr_groups	= rapl_attr_groups;
 	rapl_pmus->pmu.attr_update	= rapl_attr_update;
@@ -674,7 +674,7 @@ static int __init init_rapl_pmus(void)
 	rapl_pmus->pmu.module		= THIS_MODULE;
 	rapl_pmus->pmu.capabilities	= PERF_PMU_CAP_NO_EXCLUDE;
 
-	return init_rapl_pmu();
+	return init_rapl_pmu(rapl_pmus);
 }
 
 static struct rapl_model model_snb = {
@@ -798,8 +798,12 @@ MODULE_DEVICE_TABLE(x86cpu, rapl_model_match);
 static int __init rapl_pmu_init(void)
 {
 	const struct x86_cpu_id *id;
+	int rapl_pmu_scope = PERF_PMU_SCOPE_DIE;
 	int ret;
 
+	if (rapl_pmu_is_pkg_scope())
+		rapl_pmu_scope = PERF_PMU_SCOPE_PKG;
+
 	id = x86_match_cpu(rapl_model_match);
 	if (!id)
 		return -ENODEV;
@@ -815,7 +819,7 @@ static int __init rapl_pmu_init(void)
 	if (ret)
 		return ret;
 
-	ret = init_rapl_pmus();
+	ret = init_rapl_pmus(&rapl_pmus, rapl_pmu_scope);
 	if (ret)
 		return ret;
 
@@ -828,7 +832,7 @@ static int __init rapl_pmu_init(void)
 
 out:
 	pr_warn("Initialization failed (%d), disabled\n", ret);
-	cleanup_rapl_pmus();
+	cleanup_rapl_pmus(rapl_pmus);
 	return ret;
 }
 module_init(rapl_pmu_init);
@@ -836,6 +840,6 @@ module_init(rapl_pmu_init);
 static void __exit intel_rapl_exit(void)
 {
 	perf_pmu_unregister(&rapl_pmus->pmu);
-	cleanup_rapl_pmus();
+	cleanup_rapl_pmus(rapl_pmus);
 }
 module_exit(intel_rapl_exit);
-- 
2.34.1