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2024-02-19 1c055e55a242a33e574e48be530e06770a210dcd

 kernel/drivers/devfreq/event/exynos-ppmu.c
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..
@@ -1,12 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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- * exynos_ppmu.c - EXYNOS PPMU (Platform Performance Monitoring Unit) support
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+ * exynos_ppmu.c - Exynos PPMU (Platform Performance Monitoring Unit) support
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  *
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  * Copyright (c) 2014-2015 Samsung Electronics Co., Ltd.
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  * Author : Chanwoo Choi <cw00.choi@samsung.com>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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  *
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  * This driver is based on drivers/devfreq/exynos/exynos_ppmu.c
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9
  */
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@@ -16,12 +13,18 @@
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 #include <linux/kernel.h>
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 #include <linux/module.h>
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 #include <linux/of_address.h>
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+#include <linux/of_device.h>
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 #include <linux/platform_device.h>
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 #include <linux/regmap.h>
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 #include <linux/suspend.h>
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 #include <linux/devfreq-event.h>
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21
 
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 #include "exynos-ppmu.h"
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+
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+enum exynos_ppmu_type {
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+	EXYNOS_TYPE_PPMU,
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+	EXYNOS_TYPE_PPMU_V2,
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+};
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28
 
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 struct exynos_ppmu_data {
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 	struct clk *clk;
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@@ -36,6 +39,7 @@
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 	struct regmap *regmap;
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40
 
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 	struct exynos_ppmu_data ppmu;
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+	enum exynos_ppmu_type ppmu_type;
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 };
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44
 
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 #define PPMU_EVENT(name)			\
..
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@@ -89,17 +93,28 @@
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 	PPMU_EVENT(d1-cpu),
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 	PPMU_EVENT(d1-general),
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 	PPMU_EVENT(d1-rt),
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+
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+	/* For Exynos5422 SoC */
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+	PPMU_EVENT(dmc0_0),
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+	PPMU_EVENT(dmc0_1),
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+	PPMU_EVENT(dmc1_0),
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+	PPMU_EVENT(dmc1_1),
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 };
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103
 
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-static int exynos_ppmu_find_ppmu_id(struct devfreq_event_dev *edev)
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+static int __exynos_ppmu_find_ppmu_id(const char *edev_name)
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 {
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 	int i;
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 	for (i = 0; i < ARRAY_SIZE(ppmu_events); i++)
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-		if (!strcmp(edev->desc->name, ppmu_events[i].name))
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+		if (!strcmp(edev_name, ppmu_events[i].name))
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 			return ppmu_events[i].id;
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 	return -EINVAL;
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+}
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+
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+static int exynos_ppmu_find_ppmu_id(struct devfreq_event_dev *edev)
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+{
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+	return __exynos_ppmu_find_ppmu_id(edev->desc->name);
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 }
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 /*
..
..
@@ -154,9 +169,9 @@
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 	if (ret < 0)
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 		return ret;
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-	/* Set the event of Read/Write data count  */
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+	/* Set the event of proper data type monitoring */
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 	ret = regmap_write(info->regmap, PPMU_BEVTxSEL(id),
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-				PPMU_RO_DATA_CNT | PPMU_WO_DATA_CNT);
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+			   edev->desc->event_type);
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 	if (ret < 0)
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 		return ret;
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177
 
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@@ -368,23 +383,11 @@
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 	if (ret < 0)
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 		return ret;
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385
 
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-	/* Set the event of Read/Write data count  */
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-	switch (id) {
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-	case PPMU_PMNCNT0:
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-	case PPMU_PMNCNT1:
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-	case PPMU_PMNCNT2:
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-		ret = regmap_write(info->regmap, PPMU_V2_CH_EVx_TYPE(id),
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-				PPMU_V2_RO_DATA_CNT | PPMU_V2_WO_DATA_CNT);
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-		if (ret < 0)
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-			return ret;
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-		break;
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-	case PPMU_PMNCNT3:
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-		ret = regmap_write(info->regmap, PPMU_V2_CH_EVx_TYPE(id),
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-				PPMU_V2_EVT3_RW_DATA_CNT);
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-		if (ret < 0)
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-			return ret;
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-		break;
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-	}
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+	/* Set the event of proper data type monitoring */
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+	ret = regmap_write(info->regmap, PPMU_V2_CH_EVx_TYPE(id),
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+			   edev->desc->event_type);
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+	if (ret < 0)
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+		return ret;
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 	/* Reset cycle counter/performance counter and enable PPMU */
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 	ret = regmap_read(info->regmap, PPMU_V2_PMNC, &pmnc);
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@@ -483,31 +486,24 @@
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 static const struct of_device_id exynos_ppmu_id_match[] = {
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 	{
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 		.compatible = "samsung,exynos-ppmu",
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-		.data = (void *)&exynos_ppmu_ops,
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+		.data = (void *)EXYNOS_TYPE_PPMU,
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 	}, {
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 		.compatible = "samsung,exynos-ppmu-v2",
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-		.data = (void *)&exynos_ppmu_v2_ops,
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+		.data = (void *)EXYNOS_TYPE_PPMU_V2,
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 	},
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 	{ /* sentinel */ },
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 };
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 MODULE_DEVICE_TABLE(of, exynos_ppmu_id_match);
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497
 
495
-static struct devfreq_event_ops *exynos_bus_get_ops(struct device_node *np)
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-{
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-	const struct of_device_id *match;
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-
499
-	match = of_match_node(exynos_ppmu_id_match, np);
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-	return (struct devfreq_event_ops *)match->data;
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-}
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-
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498
 static int of_get_devfreq_events(struct device_node *np,
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 				 struct exynos_ppmu *info)
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 {
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 	struct devfreq_event_desc *desc;
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-	struct devfreq_event_ops *event_ops;
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 	struct device *dev = info->dev;
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 	struct device_node *events_np, *node;
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 	int i, j, count;
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+	const struct of_device_id *of_id;
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+	int ret;
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507
 
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 	events_np = of_get_child_by_name(np, "events");
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509
 	if (!events_np) {
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@@ -515,13 +511,22 @@
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 			"failed to get child node of devfreq-event devices\n");
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 		return -EINVAL;
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513
 	}
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-	event_ops = exynos_bus_get_ops(np);
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514
 
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 	count = of_get_child_count(events_np);
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 	desc = devm_kcalloc(dev, count, sizeof(*desc), GFP_KERNEL);
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-	if (!desc)
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+	if (!desc) {
518
+		of_node_put(events_np);
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519
 		return -ENOMEM;
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+	}
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521
 	info->num_events = count;
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+
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+	of_id = of_match_device(exynos_ppmu_id_match, dev);
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+	if (of_id)
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+		info->ppmu_type = (enum exynos_ppmu_type)of_id->data;
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+	else {
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+		of_node_put(events_np);
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+		return -EINVAL;
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+	}
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530
 
526
531
 	j = 0;
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532
 	for_each_child_of_node(events_np, node) {
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@@ -529,21 +534,60 @@
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 			if (!ppmu_events[i].name)
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 				continue;
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536
 
532
-			if (!of_node_cmp(node->name, ppmu_events[i].name))
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+			if (of_node_name_eq(node, ppmu_events[i].name))
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 				break;
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 		}
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540
 
536
541
 		if (i == ARRAY_SIZE(ppmu_events)) {
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 			dev_warn(dev,
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-				"don't know how to configure events : %s\n",
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-				node->name);
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+				"don't know how to configure events : %pOFn\n",
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+				node);
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 			continue;
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 		}
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547
 
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-		desc[j].ops = event_ops;
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+		switch (info->ppmu_type) {
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+		case EXYNOS_TYPE_PPMU:
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+			desc[j].ops = &exynos_ppmu_ops;
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+			break;
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+		case EXYNOS_TYPE_PPMU_V2:
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+			desc[j].ops = &exynos_ppmu_v2_ops;
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+			break;
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+		}
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+
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 		desc[j].driver_data = info;
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558
 
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 		of_property_read_string(node, "event-name", &desc[j].name);
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+		ret = of_property_read_u32(node, "event-data-type",
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+					   &desc[j].event_type);
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+		if (ret) {
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+			/* Set the event of proper data type counting.
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+			 * Check if the data type has been defined in DT,
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+			 * use default if not.
566
+			 */
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+			if (info->ppmu_type == EXYNOS_TYPE_PPMU_V2) {
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+				int id;
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+				/* Not all registers take the same value for
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+				 * read+write data count.
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+				 */
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+				id = __exynos_ppmu_find_ppmu_id(desc[j].name);
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+
574
+				switch (id) {
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+				case PPMU_PMNCNT0:
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+				case PPMU_PMNCNT1:
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+				case PPMU_PMNCNT2:
578
+					desc[j].event_type = PPMU_V2_RO_DATA_CNT
579
+						| PPMU_V2_WO_DATA_CNT;
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+					break;
581
+				case PPMU_PMNCNT3:
582
+					desc[j].event_type =
583
+						PPMU_V2_EVT3_RW_DATA_CNT;
584
+					break;
585
+				}
586
+			} else {
587
+				desc[j].event_type = PPMU_RO_DATA_CNT |
588
+					PPMU_WO_DATA_CNT;
589
+			}
590
+		}
547
591
 
548
592
 		j++;
549
593
 	}
..
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@@ -636,7 +680,6 @@
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 	for (i = 0; i < info->num_events; i++) {
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 		edev[i] = devm_devfreq_event_add_edev(&pdev->dev, &desc[i]);
638
682
 		if (IS_ERR(edev[i])) {
639
-			ret = PTR_ERR(edev[i]);
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 			dev_err(&pdev->dev,
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684
 				"failed to add devfreq-event device\n");
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 			return PTR_ERR(edev[i]);