linux-kernel - [PATCH v8 3/6] perf/marvell: Refactor to add version

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Message-ID: <20240919074717.3276854-4-gthiagarajan@marvell.com>
Date: Thu, 19 Sep 2024 13:17:14 +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 3/6] perf/marvell: Refactor to add version - no functional change

This change is aimed at improving the maintainability of the code and
laying the groundwork for versioning within the driver.

No functional changes are introduced in this commit; the driver's
behavior and performance remain unchanged.

Signed-off-by: Gowthami Thiagarajan <gthiagarajan@...vell.com>
---
 drivers/perf/marvell_cn10k_ddr_pmu.c | 63 ++++++++++++++++++----------
 1 file changed, 42 insertions(+), 21 deletions(-)

diff --git a/drivers/perf/marvell_cn10k_ddr_pmu.c b/drivers/perf/marvell_cn10k_ddr_pmu.c
index 648ad3a740bf..65422fd5ddd2 100644
--- a/drivers/perf/marvell_cn10k_ddr_pmu.c
+++ b/drivers/perf/marvell_cn10k_ddr_pmu.c
@@ -124,10 +124,19 @@
 #define CN10K_DDRC_PERF_CNT_VALUE_WR_OP		0x80D0
 #define CN10K_DDRC_PERF_CNT_VALUE_RD_OP		0x80D8
 
+enum mrvl_ddr_pmu_version {
+	DDR_PMU_V1 = 1,
+};
+
+struct ddr_pmu_data {
+	int id;
+};
+
 struct cn10k_ddr_pmu {
 	struct pmu pmu;
 	void __iomem *base;
 	const struct ddr_pmu_platform_data *p_data;
+	int version;
 	unsigned int cpu;
 	struct	device *dev;
 	int active_events;
@@ -738,12 +747,19 @@ static const struct ddr_pmu_platform_data cn10k_ddr_pmu_pdata = {
 	.ops = &ddr_pmu_ops,
 };
 
+#if defined(CONFIG_ACPI) || defined(CONFIG_OF)
+static const struct ddr_pmu_data ddr_pmu_data = {
+	.id   = DDR_PMU_V1,
+};
+#endif
+
 static int cn10k_ddr_perf_probe(struct platform_device *pdev)
 {
 	const struct ddr_pmu_data *dev_data;
 	struct cn10k_ddr_pmu *ddr_pmu;
 	struct resource *res;
 	void __iomem *base;
+	int version;
 	char *name;
 	int ret;
 
@@ -760,31 +776,36 @@ static int cn10k_ddr_perf_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
+	version = dev_data->id;
+	ddr_pmu->version = version;
+
 	base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 	if (IS_ERR(base))
 		return PTR_ERR(base);
 
 	ddr_pmu->base = base;
 
-	ddr_pmu->p_data = &cn10k_ddr_pmu_pdata;
-	/* Setup the PMU counter to work in manual mode */
-	writeq_relaxed(OP_MODE_CTRL_VAL_MANUAL, ddr_pmu->base +
-		       ddr_pmu->p_data->ddrc_perf_cnt_op_mode_ctrl);
-
-	ddr_pmu->pmu = (struct pmu) {
-		.module	      = THIS_MODULE,
-		.capabilities = PERF_PMU_CAP_NO_EXCLUDE,
-		.task_ctx_nr = perf_invalid_context,
-		.attr_groups = cn10k_attr_groups,
-		.event_init  = cn10k_ddr_perf_event_init,
-		.add	     = cn10k_ddr_perf_event_add,
-		.del	     = cn10k_ddr_perf_event_del,
-		.start	     = cn10k_ddr_perf_event_start,
-		.stop	     = cn10k_ddr_perf_event_stop,
-		.read	     = cn10k_ddr_perf_event_update,
-		.pmu_enable  = cn10k_ddr_perf_pmu_enable,
-		.pmu_disable = cn10k_ddr_perf_pmu_disable,
-	};
+	if (version == DDR_PMU_V1) {
+		ddr_pmu->p_data = &cn10k_ddr_pmu_pdata;
+		/* Setup the PMU counter to work in manual mode */
+		writeq_relaxed(OP_MODE_CTRL_VAL_MANUAL, ddr_pmu->base +
+			       ddr_pmu->p_data->ddrc_perf_cnt_op_mode_ctrl);
+
+		ddr_pmu->pmu = (struct pmu) {
+			.module	      = THIS_MODULE,
+			.capabilities = PERF_PMU_CAP_NO_EXCLUDE,
+			.task_ctx_nr = perf_invalid_context,
+			.attr_groups = cn10k_attr_groups,
+			.event_init  = cn10k_ddr_perf_event_init,
+			.add	     = cn10k_ddr_perf_event_add,
+			.del	     = cn10k_ddr_perf_event_del,
+			.start	     = cn10k_ddr_perf_event_start,
+			.stop	     = cn10k_ddr_perf_event_stop,
+			.read	     = cn10k_ddr_perf_event_update,
+			.pmu_enable  = cn10k_ddr_perf_pmu_enable,
+			.pmu_disable = cn10k_ddr_perf_pmu_disable,
+		};
+	}
 
 	/* Choose this cpu to collect perf data */
 	ddr_pmu->cpu = raw_smp_processor_id();
@@ -827,7 +848,7 @@ static void cn10k_ddr_perf_remove(struct platform_device *pdev)
 
 #ifdef CONFIG_OF
 static const struct of_device_id cn10k_ddr_pmu_of_match[] = {
-	{ .compatible = "marvell,cn10k-ddr-pmu", },
+	{ .compatible = "marvell,cn10k-ddr-pmu", .data = &ddr_pmu_data},
 	{ },
 };
 MODULE_DEVICE_TABLE(of, cn10k_ddr_pmu_of_match);
@@ -835,7 +856,7 @@ MODULE_DEVICE_TABLE(of, cn10k_ddr_pmu_of_match);
 
 #ifdef CONFIG_ACPI
 static const struct acpi_device_id cn10k_ddr_pmu_acpi_match[] = {
-	{"MRVL000A", 0},
+	{"MRVL000A", (kernel_ulong_t)&ddr_pmu_data},
 	{},
 };
 MODULE_DEVICE_TABLE(acpi, cn10k_ddr_pmu_acpi_match);
-- 
2.25.1