linux-kernel - [PATCH v8 5/6] perf/marvell : Refactor to extract platform data

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Message-ID: <20240919074717.3276854-6-gthiagarajan@marvell.com>
Date: Thu, 19 Sep 2024 13:17:16 +0530
From: Gowthami Thiagarajan <gthiagarajan@...vell.com>
To: <will@...nel.org>, <mark.rutland@....com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
CC: <gcherian@...vell.com>, <bbhushan2@...vell.com>, <sgoutham@...vell.com>,
        Gowthami Thiagarajan <gthiagarajan@...vell.com>
Subject: [PATCH v8 5/6] perf/marvell : Refactor to extract platform data - no functional change

This commit introduces a refactor to the Marvell TAD PMU driver
specifically to add versioning to the existing driver.

No functional changes are introduced; the behavior and performance
of the driver remain unchanged.

Signed-off-by: Gowthami Thiagarajan <gthiagarajan@...vell.com>
---
 drivers/perf/marvell_cn10k_tad_pmu.c | 31 +++++++++++++++++++++++++---
 1 file changed, 28 insertions(+), 3 deletions(-)

diff --git a/drivers/perf/marvell_cn10k_tad_pmu.c b/drivers/perf/marvell_cn10k_tad_pmu.c
index 9e635f355470..15f9f67cb3bd 100644
--- a/drivers/perf/marvell_cn10k_tad_pmu.c
+++ b/drivers/perf/marvell_cn10k_tad_pmu.c
@@ -37,6 +37,14 @@ struct tad_pmu {
 	DECLARE_BITMAP(counters_map, TAD_MAX_COUNTERS);
 };
 
+enum mrvl_tad_pmu_version {
+	TAD_PMU_V1 = 1,
+};
+
+struct tad_pmu_data {
+	int id;
+};
+
 static int tad_pmu_cpuhp_state;
 
 static void tad_pmu_event_counter_read(struct perf_event *event)
@@ -254,6 +262,7 @@ static const struct attribute_group *tad_pmu_attr_groups[] = {
 
 static int tad_pmu_probe(struct platform_device *pdev)
 {
+	const struct tad_pmu_data *dev_data;
 	struct device *dev = &pdev->dev;
 	struct tad_region *regions;
 	struct tad_pmu *tad_pmu;
@@ -261,6 +270,7 @@ static int tad_pmu_probe(struct platform_device *pdev)
 	u32 tad_pmu_page_size;
 	u32 tad_page_size;
 	u32 tad_cnt;
+	int version;
 	int i, ret;
 	char *name;
 
@@ -270,6 +280,13 @@ static int tad_pmu_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, tad_pmu);
 
+	dev_data = device_get_match_data(&pdev->dev);
+	if (!dev_data) {
+		dev_err(&pdev->dev, "Error: No device match data found\n");
+		return -ENODEV;
+	}
+	version = dev_data->id;
+
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		dev_err(&pdev->dev, "Mem resource not found\n");
@@ -319,7 +336,6 @@ static int tad_pmu_probe(struct platform_device *pdev)
 	tad_pmu->pmu = (struct pmu) {
 
 		.module		= THIS_MODULE,
-		.attr_groups	= tad_pmu_attr_groups,
 		.capabilities	= PERF_PMU_CAP_NO_EXCLUDE |
 				  PERF_PMU_CAP_NO_INTERRUPT,
 		.task_ctx_nr	= perf_invalid_context,
@@ -332,6 +348,9 @@ static int tad_pmu_probe(struct platform_device *pdev)
 		.read		= tad_pmu_event_counter_read,
 	};
 
+	if (version == TAD_PMU_V1)
+		tad_pmu->pmu.attr_groups = tad_pmu_attr_groups;
+
 	tad_pmu->cpu = raw_smp_processor_id();
 
 	/* Register pmu instance for cpu hotplug */
@@ -360,16 +379,22 @@ static void tad_pmu_remove(struct platform_device *pdev)
 	perf_pmu_unregister(&pmu->pmu);
 }
 
+#if defined(CONFIG_OF) || defined(CONFIG_ACPI)
+static const struct tad_pmu_data tad_pmu_data = {
+	.id   = TAD_PMU_V1,
+};
+#endif
+
 #ifdef CONFIG_OF
 static const struct of_device_id tad_pmu_of_match[] = {
-	{ .compatible = "marvell,cn10k-tad-pmu", },
+	{ .compatible = "marvell,cn10k-tad-pmu", .data = &tad_pmu_data },
 	{},
 };
 #endif
 
 #ifdef CONFIG_ACPI
 static const struct acpi_device_id tad_pmu_acpi_match[] = {
-	{"MRVL000B", 0},
+	{"MRVL000B", (kernel_ulong_t)&tad_pmu_data},
 	{},
 };
 MODULE_DEVICE_TABLE(acpi, tad_pmu_acpi_match);
-- 
2.25.1