blob: 96a30a032c5f990f4df75b217becaf87d6c8c873 [file] [log] [blame]
Thomas Gleixnerd2912cb2019-06-04 10:11:33 +02001// SPDX-License-Identifier: GPL-2.0-only
Viresh Kumardeaa5142015-11-11 07:59:01 +05302/*
3 * Generic OPP debugfs interface
4 *
5 * Copyright (C) 2015-2016 Viresh Kumar <viresh.kumar@linaro.org>
Viresh Kumardeaa5142015-11-11 07:59:01 +05306 */
7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/debugfs.h>
11#include <linux/device.h>
12#include <linux/err.h>
Viresh Kumar021dbec2022-02-10 14:37:53 +053013#include <linux/of.h>
Viresh Kumardeaa5142015-11-11 07:59:01 +053014#include <linux/init.h>
15#include <linux/limits.h>
Viresh Kumardfbe4672016-12-01 16:28:19 +053016#include <linux/slab.h>
Viresh Kumardeaa5142015-11-11 07:59:01 +053017
18#include "opp.h"
19
20static struct dentry *rootdir;
21
22static void opp_set_dev_name(const struct device *dev, char *name)
23{
24 if (dev->parent)
25 snprintf(name, NAME_MAX, "%s-%s", dev_name(dev->parent),
26 dev_name(dev));
27 else
28 snprintf(name, NAME_MAX, "%s", dev_name(dev));
29}
30
31void opp_debug_remove_one(struct dev_pm_opp *opp)
32{
33 debugfs_remove_recursive(opp->dentry);
34}
35
Viresh Kumar0430b1d2020-05-18 14:25:32 +030036static ssize_t bw_name_read(struct file *fp, char __user *userbuf,
37 size_t count, loff_t *ppos)
38{
39 struct icc_path *path = fp->private_data;
40 char buf[64];
41 int i;
42
43 i = scnprintf(buf, sizeof(buf), "%.62s\n", icc_get_name(path));
44
45 return simple_read_from_buffer(userbuf, count, ppos, buf, i);
46}
47
48static const struct file_operations bw_name_fops = {
49 .open = simple_open,
50 .read = bw_name_read,
51 .llseek = default_llseek,
52};
53
54static void opp_debug_create_bw(struct dev_pm_opp *opp,
55 struct opp_table *opp_table,
56 struct dentry *pdentry)
57{
58 struct dentry *d;
59 char name[11];
60 int i;
61
62 for (i = 0; i < opp_table->path_count; i++) {
63 snprintf(name, sizeof(name), "icc-path-%.1d", i);
64
65 /* Create per-path directory */
66 d = debugfs_create_dir(name, pdentry);
67
68 debugfs_create_file("name", S_IRUGO, d, opp_table->paths[i],
69 &bw_name_fops);
70 debugfs_create_u32("peak_bw", S_IRUGO, d,
71 &opp->bandwidth[i].peak);
72 debugfs_create_u32("avg_bw", S_IRUGO, d,
73 &opp->bandwidth[i].avg);
74 }
75}
76
Viresh Kumar2083da22022-06-10 12:02:04 +053077static void opp_debug_create_clks(struct dev_pm_opp *opp,
78 struct opp_table *opp_table,
79 struct dentry *pdentry)
80{
81 char name[12];
82 int i;
83
84 if (opp_table->clk_count == 1) {
85 debugfs_create_ulong("rate_hz", S_IRUGO, pdentry, &opp->rates[0]);
86 return;
87 }
88
89 for (i = 0; i < opp_table->clk_count; i++) {
90 snprintf(name, sizeof(name), "rate_hz_%d", i);
91 debugfs_create_ulong(name, S_IRUGO, pdentry, &opp->rates[i]);
92 }
93}
94
Greg Kroah-Hartmana2dea4c2019-01-22 16:21:17 +010095static void opp_debug_create_supplies(struct dev_pm_opp *opp,
Viresh Kumardfbe4672016-12-01 16:28:19 +053096 struct opp_table *opp_table,
97 struct dentry *pdentry)
98{
99 struct dentry *d;
Viresh Kumar1fae7882017-05-23 09:32:13 +0530100 int i;
Viresh Kumardfbe4672016-12-01 16:28:19 +0530101
Viresh Kumar1fae7882017-05-23 09:32:13 +0530102 for (i = 0; i < opp_table->regulator_count; i++) {
Arvind Yadavd741029a2017-09-21 11:15:36 +0530103 char name[15];
104
105 snprintf(name, sizeof(name), "supply-%d", i);
Viresh Kumardfbe4672016-12-01 16:28:19 +0530106
107 /* Create per-opp directory */
108 d = debugfs_create_dir(name, pdentry);
109
Greg Kroah-Hartmana2dea4c2019-01-22 16:21:17 +0100110 debugfs_create_ulong("u_volt_target", S_IRUGO, d,
111 &opp->supplies[i].u_volt);
Viresh Kumardfbe4672016-12-01 16:28:19 +0530112
Greg Kroah-Hartmana2dea4c2019-01-22 16:21:17 +0100113 debugfs_create_ulong("u_volt_min", S_IRUGO, d,
114 &opp->supplies[i].u_volt_min);
Viresh Kumardfbe4672016-12-01 16:28:19 +0530115
Greg Kroah-Hartmana2dea4c2019-01-22 16:21:17 +0100116 debugfs_create_ulong("u_volt_max", S_IRUGO, d,
117 &opp->supplies[i].u_volt_max);
Viresh Kumardfbe4672016-12-01 16:28:19 +0530118
Greg Kroah-Hartmana2dea4c2019-01-22 16:21:17 +0100119 debugfs_create_ulong("u_amp", S_IRUGO, d,
120 &opp->supplies[i].u_amp);
Lukasz Luba4f9a7a12022-03-02 11:29:14 +0000121
122 debugfs_create_ulong("u_watt", S_IRUGO, d,
123 &opp->supplies[i].u_watt);
Viresh Kumar1fae7882017-05-23 09:32:13 +0530124 }
Viresh Kumardfbe4672016-12-01 16:28:19 +0530125}
126
Greg Kroah-Hartmana2dea4c2019-01-22 16:21:17 +0100127void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table)
Viresh Kumardeaa5142015-11-11 07:59:01 +0530128{
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530129 struct dentry *pdentry = opp_table->dentry;
Viresh Kumardeaa5142015-11-11 07:59:01 +0530130 struct dentry *d;
Viresh Kumara1e8c132018-04-06 14:35:45 +0530131 unsigned long id;
Viresh Kumardeaa5142015-11-11 07:59:01 +0530132 char name[25]; /* 20 chars for 64 bit value + 5 (opp:\0) */
133
Viresh Kumara1e8c132018-04-06 14:35:45 +0530134 /*
135 * Get directory name for OPP.
136 *
137 * - Normally rate is unique to each OPP, use it to get unique opp-name.
Viresh Kumar2083da22022-06-10 12:02:04 +0530138 * - For some devices rate isn't available or there are multiple, use
139 * index instead for them.
Viresh Kumara1e8c132018-04-06 14:35:45 +0530140 */
Viresh Kumar2083da22022-06-10 12:02:04 +0530141 if (likely(opp_table->clk_count == 1 && opp->rates[0]))
142 id = opp->rates[0];
Viresh Kumara1e8c132018-04-06 14:35:45 +0530143 else
144 id = _get_opp_count(opp_table);
145
146 snprintf(name, sizeof(name), "opp:%lu", id);
Viresh Kumardeaa5142015-11-11 07:59:01 +0530147
148 /* Create per-opp directory */
149 d = debugfs_create_dir(name, pdentry);
Viresh Kumardeaa5142015-11-11 07:59:01 +0530150
Greg Kroah-Hartmana2dea4c2019-01-22 16:21:17 +0100151 debugfs_create_bool("available", S_IRUGO, d, &opp->available);
152 debugfs_create_bool("dynamic", S_IRUGO, d, &opp->dynamic);
153 debugfs_create_bool("turbo", S_IRUGO, d, &opp->turbo);
154 debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend);
155 debugfs_create_u32("performance_state", S_IRUGO, d, &opp->pstate);
Viresh Kumar021dbec2022-02-10 14:37:53 +0530156 debugfs_create_u32("level", S_IRUGO, d, &opp->level);
Greg Kroah-Hartmana2dea4c2019-01-22 16:21:17 +0100157 debugfs_create_ulong("clock_latency_ns", S_IRUGO, d,
158 &opp->clock_latency_ns);
Viresh Kumardeaa5142015-11-11 07:59:01 +0530159
Viresh Kumar021dbec2022-02-10 14:37:53 +0530160 opp->of_name = of_node_full_name(opp->np);
161 debugfs_create_str("of_name", S_IRUGO, d, (char **)&opp->of_name);
162
Viresh Kumar2083da22022-06-10 12:02:04 +0530163 opp_debug_create_clks(opp, opp_table, d);
Greg Kroah-Hartmana2dea4c2019-01-22 16:21:17 +0100164 opp_debug_create_supplies(opp, opp_table, d);
Viresh Kumar0430b1d2020-05-18 14:25:32 +0300165 opp_debug_create_bw(opp, opp_table, d);
Viresh Kumardeaa5142015-11-11 07:59:01 +0530166
167 opp->dentry = d;
Viresh Kumardeaa5142015-11-11 07:59:01 +0530168}
169
Greg Kroah-Hartmana2dea4c2019-01-22 16:21:17 +0100170static void opp_list_debug_create_dir(struct opp_device *opp_dev,
171 struct opp_table *opp_table)
Viresh Kumardeaa5142015-11-11 07:59:01 +0530172{
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530173 const struct device *dev = opp_dev->dev;
Viresh Kumardeaa5142015-11-11 07:59:01 +0530174 struct dentry *d;
175
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530176 opp_set_dev_name(dev, opp_table->dentry_name);
Viresh Kumardeaa5142015-11-11 07:59:01 +0530177
178 /* Create device specific directory */
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530179 d = debugfs_create_dir(opp_table->dentry_name, rootdir);
Viresh Kumardeaa5142015-11-11 07:59:01 +0530180
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530181 opp_dev->dentry = d;
182 opp_table->dentry = d;
Viresh Kumardeaa5142015-11-11 07:59:01 +0530183}
184
Greg Kroah-Hartmana2dea4c2019-01-22 16:21:17 +0100185static void opp_list_debug_create_link(struct opp_device *opp_dev,
186 struct opp_table *opp_table)
Viresh Kumardeaa5142015-11-11 07:59:01 +0530187{
Viresh Kumardeaa5142015-11-11 07:59:01 +0530188 char name[NAME_MAX];
Viresh Kumardeaa5142015-11-11 07:59:01 +0530189
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530190 opp_set_dev_name(opp_dev->dev, name);
Viresh Kumardeaa5142015-11-11 07:59:01 +0530191
192 /* Create device specific directory link */
Greg Kroah-Hartmana2dea4c2019-01-22 16:21:17 +0100193 opp_dev->dentry = debugfs_create_symlink(name, rootdir,
194 opp_table->dentry_name);
Viresh Kumardeaa5142015-11-11 07:59:01 +0530195}
196
197/**
198 * opp_debug_register - add a device opp node to the debugfs 'opp' directory
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530199 * @opp_dev: opp-dev pointer for device
200 * @opp_table: the device-opp being added
Viresh Kumardeaa5142015-11-11 07:59:01 +0530201 *
202 * Dynamically adds device specific directory in debugfs 'opp' directory. If the
203 * device-opp is shared with other devices, then links will be created for all
204 * devices except the first.
Viresh Kumardeaa5142015-11-11 07:59:01 +0530205 */
Greg Kroah-Hartmana2dea4c2019-01-22 16:21:17 +0100206void opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table)
Viresh Kumardeaa5142015-11-11 07:59:01 +0530207{
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530208 if (opp_table->dentry)
Greg Kroah-Hartmana2dea4c2019-01-22 16:21:17 +0100209 opp_list_debug_create_link(opp_dev, opp_table);
210 else
211 opp_list_debug_create_dir(opp_dev, opp_table);
Viresh Kumardeaa5142015-11-11 07:59:01 +0530212}
213
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530214static void opp_migrate_dentry(struct opp_device *opp_dev,
215 struct opp_table *opp_table)
Viresh Kumardeaa5142015-11-11 07:59:01 +0530216{
Xiaomeng Tongc14faab2022-03-31 16:30:18 +0800217 struct opp_device *new_dev = NULL, *iter;
Viresh Kumardeaa5142015-11-11 07:59:01 +0530218 const struct device *dev;
219 struct dentry *dentry;
220
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530221 /* Look for next opp-dev */
Xiaomeng Tongc14faab2022-03-31 16:30:18 +0800222 list_for_each_entry(iter, &opp_table->dev_list, node)
223 if (iter != opp_dev) {
224 new_dev = iter;
Viresh Kumardeaa5142015-11-11 07:59:01 +0530225 break;
Xiaomeng Tongc14faab2022-03-31 16:30:18 +0800226 }
227
228 BUG_ON(!new_dev);
Viresh Kumardeaa5142015-11-11 07:59:01 +0530229
230 /* new_dev is guaranteed to be valid here */
231 dev = new_dev->dev;
232 debugfs_remove_recursive(new_dev->dentry);
233
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530234 opp_set_dev_name(dev, opp_table->dentry_name);
Viresh Kumardeaa5142015-11-11 07:59:01 +0530235
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530236 dentry = debugfs_rename(rootdir, opp_dev->dentry, rootdir,
237 opp_table->dentry_name);
Viresh Kumardeaa5142015-11-11 07:59:01 +0530238 if (!dentry) {
239 dev_err(dev, "%s: Failed to rename link from: %s to %s\n",
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530240 __func__, dev_name(opp_dev->dev), dev_name(dev));
Viresh Kumardeaa5142015-11-11 07:59:01 +0530241 return;
242 }
243
244 new_dev->dentry = dentry;
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530245 opp_table->dentry = dentry;
Viresh Kumardeaa5142015-11-11 07:59:01 +0530246}
247
248/**
249 * opp_debug_unregister - remove a device opp node from debugfs opp directory
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530250 * @opp_dev: opp-dev pointer for device
251 * @opp_table: the device-opp being removed
Viresh Kumardeaa5142015-11-11 07:59:01 +0530252 *
253 * Dynamically removes device specific directory from debugfs 'opp' directory.
254 */
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530255void opp_debug_unregister(struct opp_device *opp_dev,
256 struct opp_table *opp_table)
Viresh Kumardeaa5142015-11-11 07:59:01 +0530257{
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530258 if (opp_dev->dentry == opp_table->dentry) {
Viresh Kumardeaa5142015-11-11 07:59:01 +0530259 /* Move the real dentry object under another device */
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530260 if (!list_is_singular(&opp_table->dev_list)) {
261 opp_migrate_dentry(opp_dev, opp_table);
Viresh Kumardeaa5142015-11-11 07:59:01 +0530262 goto out;
263 }
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530264 opp_table->dentry = NULL;
Viresh Kumardeaa5142015-11-11 07:59:01 +0530265 }
266
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530267 debugfs_remove_recursive(opp_dev->dentry);
Viresh Kumardeaa5142015-11-11 07:59:01 +0530268
269out:
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530270 opp_dev->dentry = NULL;
Viresh Kumardeaa5142015-11-11 07:59:01 +0530271}
272
273static int __init opp_debug_init(void)
274{
275 /* Create /sys/kernel/debug/opp directory */
276 rootdir = debugfs_create_dir("opp", NULL);
Viresh Kumardeaa5142015-11-11 07:59:01 +0530277
278 return 0;
279}
280core_initcall(opp_debug_init);