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