1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2011-2021, The Linux Foundation. All rights reserved.
4  */
5 
6 #include <linux/debugfs.h>
7 #include <linux/device.h>
8 #include <linux/io.h>
9 #include <linux/module.h>
10 #include <linux/of.h>
11 #include <linux/platform_device.h>
12 #include <linux/seq_file.h>
13 
14 #include <linux/soc/qcom/smem.h>
15 #include <clocksource/arm_arch_timer.h>
16 
17 #define RPM_DYNAMIC_ADDR	0x14
18 #define RPM_DYNAMIC_ADDR_MASK	0xFFFF
19 
20 #define STAT_TYPE_OFFSET	0x0
21 #define COUNT_OFFSET		0x4
22 #define LAST_ENTERED_AT_OFFSET	0x8
23 #define LAST_EXITED_AT_OFFSET	0x10
24 #define ACCUMULATED_OFFSET	0x18
25 #define CLIENT_VOTES_OFFSET	0x20
26 
27 struct subsystem_data {
28 	const char *name;
29 	u32 smem_item;
30 	u32 pid;
31 };
32 
33 static const struct subsystem_data subsystems[] = {
34 	{ "modem", 605, 1 },
35 	{ "wpss", 605, 13 },
36 	{ "adsp", 606, 2 },
37 	{ "cdsp", 607, 5 },
38 	{ "slpi", 608, 3 },
39 	{ "gpu", 609, 0 },
40 	{ "display", 610, 0 },
41 	{ "adsp_island", 613, 2 },
42 	{ "slpi_island", 613, 3 },
43 };
44 
45 struct stats_config {
46 	size_t stats_offset;
47 	size_t num_records;
48 	bool appended_stats_avail;
49 	bool dynamic_offset;
50 	bool subsystem_stats_in_smem;
51 };
52 
53 struct stats_data {
54 	bool appended_stats_avail;
55 	void __iomem *base;
56 };
57 
58 struct sleep_stats {
59 	u32 stat_type;
60 	u32 count;
61 	u64 last_entered_at;
62 	u64 last_exited_at;
63 	u64 accumulated;
64 };
65 
66 struct appended_stats {
67 	u32 client_votes;
68 	u32 reserved[3];
69 };
70 
qcom_print_stats(struct seq_file * s,const struct sleep_stats * stat)71 static void qcom_print_stats(struct seq_file *s, const struct sleep_stats *stat)
72 {
73 	u64 accumulated = stat->accumulated;
74 	/*
75 	 * If a subsystem is in sleep when reading the sleep stats adjust
76 	 * the accumulated sleep duration to show actual sleep time.
77 	 */
78 	if (stat->last_entered_at > stat->last_exited_at)
79 		accumulated += arch_timer_read_counter() - stat->last_entered_at;
80 
81 	seq_printf(s, "Count: %u\n", stat->count);
82 	seq_printf(s, "Last Entered At: %llu\n", stat->last_entered_at);
83 	seq_printf(s, "Last Exited At: %llu\n", stat->last_exited_at);
84 	seq_printf(s, "Accumulated Duration: %llu\n", accumulated);
85 }
86 
qcom_subsystem_sleep_stats_show(struct seq_file * s,void * unused)87 static int qcom_subsystem_sleep_stats_show(struct seq_file *s, void *unused)
88 {
89 	struct subsystem_data *subsystem = s->private;
90 	struct sleep_stats *stat;
91 
92 	/* Items are allocated lazily, so lookup pointer each time */
93 	stat = qcom_smem_get(subsystem->pid, subsystem->smem_item, NULL);
94 	if (IS_ERR(stat))
95 		return -EIO;
96 
97 	qcom_print_stats(s, stat);
98 
99 	return 0;
100 }
101 
qcom_soc_sleep_stats_show(struct seq_file * s,void * unused)102 static int qcom_soc_sleep_stats_show(struct seq_file *s, void *unused)
103 {
104 	struct stats_data *d = s->private;
105 	void __iomem *reg = d->base;
106 	struct sleep_stats stat;
107 
108 	memcpy_fromio(&stat, reg, sizeof(stat));
109 	qcom_print_stats(s, &stat);
110 
111 	if (d->appended_stats_avail) {
112 		struct appended_stats votes;
113 
114 		memcpy_fromio(&votes, reg + CLIENT_VOTES_OFFSET, sizeof(votes));
115 		seq_printf(s, "Client Votes: %#x\n", votes.client_votes);
116 	}
117 
118 	return 0;
119 }
120 
121 DEFINE_SHOW_ATTRIBUTE(qcom_soc_sleep_stats);
122 DEFINE_SHOW_ATTRIBUTE(qcom_subsystem_sleep_stats);
123 
qcom_create_soc_sleep_stat_files(struct dentry * root,void __iomem * reg,struct stats_data * d,const struct stats_config * config)124 static void qcom_create_soc_sleep_stat_files(struct dentry *root, void __iomem *reg,
125 					     struct stats_data *d,
126 					     const struct stats_config *config)
127 {
128 	char stat_type[sizeof(u32) + 1] = {0};
129 	size_t stats_offset = config->stats_offset;
130 	u32 offset = 0, type;
131 	int i, j;
132 
133 	/*
134 	 * On RPM targets, stats offset location is dynamic and changes from target
135 	 * to target and sometimes from build to build for same target.
136 	 *
137 	 * In such cases the dynamic address is present at 0x14 offset from base
138 	 * address in devicetree. The last 16bits indicates the stats_offset.
139 	 */
140 	if (config->dynamic_offset) {
141 		stats_offset = readl(reg + RPM_DYNAMIC_ADDR);
142 		stats_offset &= RPM_DYNAMIC_ADDR_MASK;
143 	}
144 
145 	for (i = 0; i < config->num_records; i++) {
146 		d[i].base = reg + offset + stats_offset;
147 
148 		/*
149 		 * Read the low power mode name and create debugfs file for it.
150 		 * The names read could be of below,
151 		 * (may change depending on low power mode supported).
152 		 * For rpmh-sleep-stats: "aosd", "cxsd" and "ddr".
153 		 * For rpm-sleep-stats: "vmin" and "vlow".
154 		 */
155 		type = readl(d[i].base);
156 		for (j = 0; j < sizeof(u32); j++) {
157 			stat_type[j] = type & 0xff;
158 			type = type >> 8;
159 		}
160 		strim(stat_type);
161 		debugfs_create_file(stat_type, 0400, root, &d[i],
162 				    &qcom_soc_sleep_stats_fops);
163 
164 		offset += sizeof(struct sleep_stats);
165 		if (d[i].appended_stats_avail)
166 			offset += sizeof(struct appended_stats);
167 	}
168 }
169 
qcom_create_subsystem_stat_files(struct dentry * root,const struct stats_config * config)170 static void qcom_create_subsystem_stat_files(struct dentry *root,
171 					     const struct stats_config *config)
172 {
173 	const struct sleep_stats *stat;
174 	int i;
175 
176 	if (!config->subsystem_stats_in_smem)
177 		return;
178 
179 	for (i = 0; i < ARRAY_SIZE(subsystems); i++) {
180 		stat = qcom_smem_get(subsystems[i].pid, subsystems[i].smem_item, NULL);
181 		if (IS_ERR(stat))
182 			continue;
183 
184 		debugfs_create_file(subsystems[i].name, 0400, root, (void *)&subsystems[i],
185 				    &qcom_subsystem_sleep_stats_fops);
186 	}
187 }
188 
qcom_stats_probe(struct platform_device * pdev)189 static int qcom_stats_probe(struct platform_device *pdev)
190 {
191 	void __iomem *reg;
192 	struct dentry *root;
193 	const struct stats_config *config;
194 	struct stats_data *d;
195 	int i;
196 
197 	config = device_get_match_data(&pdev->dev);
198 	if (!config)
199 		return -ENODEV;
200 
201 	reg = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
202 	if (IS_ERR(reg))
203 		return -ENOMEM;
204 
205 	d = devm_kcalloc(&pdev->dev, config->num_records,
206 			 sizeof(*d), GFP_KERNEL);
207 	if (!d)
208 		return -ENOMEM;
209 
210 	for (i = 0; i < config->num_records; i++)
211 		d[i].appended_stats_avail = config->appended_stats_avail;
212 
213 	root = debugfs_create_dir("qcom_stats", NULL);
214 
215 	qcom_create_subsystem_stat_files(root, config);
216 	qcom_create_soc_sleep_stat_files(root, reg, d, config);
217 
218 	platform_set_drvdata(pdev, root);
219 
220 	return 0;
221 }
222 
qcom_stats_remove(struct platform_device * pdev)223 static int qcom_stats_remove(struct platform_device *pdev)
224 {
225 	struct dentry *root = platform_get_drvdata(pdev);
226 
227 	debugfs_remove_recursive(root);
228 
229 	return 0;
230 }
231 
232 static const struct stats_config rpm_data = {
233 	.stats_offset = 0,
234 	.num_records = 2,
235 	.appended_stats_avail = true,
236 	.dynamic_offset = true,
237 	.subsystem_stats_in_smem = false,
238 };
239 
240 /* Older RPM firmwares have the stats at a fixed offset instead */
241 static const struct stats_config rpm_data_dba0 = {
242 	.stats_offset = 0xdba0,
243 	.num_records = 2,
244 	.appended_stats_avail = true,
245 	.dynamic_offset = false,
246 	.subsystem_stats_in_smem = false,
247 };
248 
249 static const struct stats_config rpmh_data = {
250 	.stats_offset = 0x48,
251 	.num_records = 3,
252 	.appended_stats_avail = false,
253 	.dynamic_offset = false,
254 	.subsystem_stats_in_smem = true,
255 };
256 
257 static const struct of_device_id qcom_stats_table[] = {
258 	{ .compatible = "qcom,apq8084-rpm-stats", .data = &rpm_data_dba0 },
259 	{ .compatible = "qcom,msm8226-rpm-stats", .data = &rpm_data_dba0 },
260 	{ .compatible = "qcom,msm8916-rpm-stats", .data = &rpm_data_dba0 },
261 	{ .compatible = "qcom,msm8974-rpm-stats", .data = &rpm_data_dba0 },
262 	{ .compatible = "qcom,rpm-stats", .data = &rpm_data },
263 	{ .compatible = "qcom,rpmh-stats", .data = &rpmh_data },
264 	{ }
265 };
266 MODULE_DEVICE_TABLE(of, qcom_stats_table);
267 
268 static struct platform_driver qcom_stats = {
269 	.probe = qcom_stats_probe,
270 	.remove = qcom_stats_remove,
271 	.driver = {
272 		.name = "qcom_stats",
273 		.of_match_table = qcom_stats_table,
274 	},
275 };
276 
qcom_stats_init(void)277 static int __init qcom_stats_init(void)
278 {
279 	return platform_driver_register(&qcom_stats);
280 }
281 late_initcall(qcom_stats_init);
282 
qcom_stats_exit(void)283 static void __exit qcom_stats_exit(void)
284 {
285 	platform_driver_unregister(&qcom_stats);
286 }
287 module_exit(qcom_stats_exit)
288 
289 MODULE_DESCRIPTION("Qualcomm Technologies, Inc. (QTI) Stats driver");
290 MODULE_LICENSE("GPL v2");
291