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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Generic OPP debugfs interface
4 *
5 * Copyright (C) 2015-2016 Viresh Kumar <viresh.kumar@linaro.org>
6 */
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>
13#include <linux/of.h>
14#include <linux/init.h>
15#include <linux/limits.h>
16#include <linux/slab.h>
17
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
36static 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 const char *name = icc_get_name(path);
41 char buf[64];
42 int i = 0;
43
44 if (name)
45 i = scnprintf(buf, sizeof(buf), "%.62s\n", name);
46
47 return simple_read_from_buffer(userbuf, count, ppos, buf, i);
48}
49
50static const struct file_operations bw_name_fops = {
51 .open = simple_open,
52 .read = bw_name_read,
53 .llseek = default_llseek,
54};
55
56static void opp_debug_create_bw(struct dev_pm_opp *opp,
57 struct opp_table *opp_table,
58 struct dentry *pdentry)
59{
60 struct dentry *d;
61 char name[] = "icc-path-XXXXXXXXXXX"; /* Integers can take 11 chars max */
62 int i;
63
64 for (i = 0; i < opp_table->path_count; i++) {
65 snprintf(name, sizeof(name), "icc-path-%d", i);
66
67 /* Create per-path directory */
68 d = debugfs_create_dir(name, pdentry);
69
70 debugfs_create_file("name", S_IRUGO, d, opp_table->paths[i],
71 &bw_name_fops);
72 debugfs_create_u32("peak_bw", S_IRUGO, d,
73 &opp->bandwidth[i].peak);
74 debugfs_create_u32("avg_bw", S_IRUGO, d,
75 &opp->bandwidth[i].avg);
76 }
77}
78
79static void opp_debug_create_clks(struct dev_pm_opp *opp,
80 struct opp_table *opp_table,
81 struct dentry *pdentry)
82{
83 char name[] = "rate_hz_XXXXXXXXXXX"; /* Integers can take 11 chars max */
84 int i;
85
86 if (opp_table->clk_count == 1) {
87 debugfs_create_ulong("rate_hz", S_IRUGO, pdentry, &opp->rates[0]);
88 return;
89 }
90
91 for (i = 0; i < opp_table->clk_count; i++) {
92 snprintf(name, sizeof(name), "rate_hz_%d", i);
93 debugfs_create_ulong(name, S_IRUGO, pdentry, &opp->rates[i]);
94 }
95}
96
97static void opp_debug_create_supplies(struct dev_pm_opp *opp,
98 struct opp_table *opp_table,
99 struct dentry *pdentry)
100{
101 struct dentry *d;
102 int i;
103
104 for (i = 0; i < opp_table->regulator_count; i++) {
105 char name[] = "supply-XXXXXXXXXXX"; /* Integers can take 11 chars max */
106
107 snprintf(name, sizeof(name), "supply-%d", i);
108
109 /* Create per-opp directory */
110 d = debugfs_create_dir(name, pdentry);
111
112 debugfs_create_ulong("u_volt_target", S_IRUGO, d,
113 &opp->supplies[i].u_volt);
114
115 debugfs_create_ulong("u_volt_min", S_IRUGO, d,
116 &opp->supplies[i].u_volt_min);
117
118 debugfs_create_ulong("u_volt_max", S_IRUGO, d,
119 &opp->supplies[i].u_volt_max);
120
121 debugfs_create_ulong("u_amp", S_IRUGO, d,
122 &opp->supplies[i].u_amp);
123
124 debugfs_create_ulong("u_watt", S_IRUGO, d,
125 &opp->supplies[i].u_watt);
126 }
127}
128
129void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table)
130{
131 struct dentry *pdentry = opp_table->dentry;
132 struct dentry *d;
133 unsigned long id;
134 char name[25]; /* 20 chars for 64 bit value + 5 (opp:\0) */
135
136 /*
137 * Get directory name for OPP.
138 *
139 * - Normally rate is unique to each OPP, use it to get unique opp-name.
140 * - For some devices rate isn't available or there are multiple, use
141 * index instead for them.
142 */
143 if (likely(opp_table->clk_count == 1 && opp->rates[0]))
144 id = opp->rates[0];
145 else
146 id = _get_opp_count(opp_table);
147
148 snprintf(name, sizeof(name), "opp:%lu", id);
149
150 /* Create per-opp directory */
151 d = debugfs_create_dir(name, pdentry);
152
153 debugfs_create_bool("available", S_IRUGO, d, &opp->available);
154 debugfs_create_bool("dynamic", S_IRUGO, d, &opp->dynamic);
155 debugfs_create_bool("turbo", S_IRUGO, d, &opp->turbo);
156 debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend);
157 debugfs_create_u32("level", S_IRUGO, d, &opp->level);
158 debugfs_create_ulong("clock_latency_ns", S_IRUGO, d,
159 &opp->clock_latency_ns);
160
161 opp->of_name = of_node_full_name(opp->np);
162 debugfs_create_str("of_name", S_IRUGO, d, (char **)&opp->of_name);
163
164 opp_debug_create_clks(opp, opp_table, d);
165 opp_debug_create_supplies(opp, opp_table, d);
166 opp_debug_create_bw(opp, opp_table, d);
167
168 opp->dentry = d;
169}
170
171static void opp_list_debug_create_dir(struct opp_device *opp_dev,
172 struct opp_table *opp_table)
173{
174 const struct device *dev = opp_dev->dev;
175 struct dentry *d;
176
177 opp_set_dev_name(dev, opp_table->dentry_name);
178
179 /* Create device specific directory */
180 d = debugfs_create_dir(opp_table->dentry_name, rootdir);
181
182 opp_dev->dentry = d;
183 opp_table->dentry = d;
184}
185
186static void opp_list_debug_create_link(struct opp_device *opp_dev,
187 struct opp_table *opp_table)
188{
189 char name[NAME_MAX];
190
191 opp_set_dev_name(opp_dev->dev, name);
192
193 /* Create device specific directory link */
194 opp_dev->dentry = debugfs_create_symlink(name, rootdir,
195 opp_table->dentry_name);
196}
197
198/**
199 * opp_debug_register - add a device opp node to the debugfs 'opp' directory
200 * @opp_dev: opp-dev pointer for device
201 * @opp_table: the device-opp being added
202 *
203 * Dynamically adds device specific directory in debugfs 'opp' directory. If the
204 * device-opp is shared with other devices, then links will be created for all
205 * devices except the first.
206 */
207void opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table)
208{
209 if (opp_table->dentry)
210 opp_list_debug_create_link(opp_dev, opp_table);
211 else
212 opp_list_debug_create_dir(opp_dev, opp_table);
213}
214
215static void opp_migrate_dentry(struct opp_device *opp_dev,
216 struct opp_table *opp_table)
217{
218 struct opp_device *new_dev = NULL, *iter;
219 const struct device *dev;
220 struct dentry *dentry;
221
222 /* Look for next opp-dev */
223 list_for_each_entry(iter, &opp_table->dev_list, node)
224 if (iter != opp_dev) {
225 new_dev = iter;
226 break;
227 }
228
229 BUG_ON(!new_dev);
230
231 /* new_dev is guaranteed to be valid here */
232 dev = new_dev->dev;
233 debugfs_remove_recursive(new_dev->dentry);
234
235 opp_set_dev_name(dev, opp_table->dentry_name);
236
237 dentry = debugfs_rename(rootdir, opp_dev->dentry, rootdir,
238 opp_table->dentry_name);
239 if (IS_ERR(dentry)) {
240 dev_err(dev, "%s: Failed to rename link from: %s to %s\n",
241 __func__, dev_name(opp_dev->dev), dev_name(dev));
242 return;
243 }
244
245 new_dev->dentry = dentry;
246 opp_table->dentry = dentry;
247}
248
249/**
250 * opp_debug_unregister - remove a device opp node from debugfs opp directory
251 * @opp_dev: opp-dev pointer for device
252 * @opp_table: the device-opp being removed
253 *
254 * Dynamically removes device specific directory from debugfs 'opp' directory.
255 */
256void opp_debug_unregister(struct opp_device *opp_dev,
257 struct opp_table *opp_table)
258{
259 if (opp_dev->dentry == opp_table->dentry) {
260 /* Move the real dentry object under another device */
261 if (!list_is_singular(&opp_table->dev_list)) {
262 opp_migrate_dentry(opp_dev, opp_table);
263 goto out;
264 }
265 opp_table->dentry = NULL;
266 }
267
268 debugfs_remove_recursive(opp_dev->dentry);
269
270out:
271 opp_dev->dentry = NULL;
272}
273
274static int __init opp_debug_init(void)
275{
276 /* Create /sys/kernel/debug/opp directory */
277 rootdir = debugfs_create_dir("opp", NULL);
278
279 return 0;
280}
281core_initcall(opp_debug_init);
1/*
2 * Generic OPP debugfs interface
3 *
4 * Copyright (C) 2015-2016 Viresh Kumar <viresh.kumar@linaro.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <linux/debugfs.h>
14#include <linux/device.h>
15#include <linux/err.h>
16#include <linux/init.h>
17#include <linux/limits.h>
18#include <linux/slab.h>
19
20#include "opp.h"
21
22static struct dentry *rootdir;
23
24static void opp_set_dev_name(const struct device *dev, char *name)
25{
26 if (dev->parent)
27 snprintf(name, NAME_MAX, "%s-%s", dev_name(dev->parent),
28 dev_name(dev));
29 else
30 snprintf(name, NAME_MAX, "%s", dev_name(dev));
31}
32
33void opp_debug_remove_one(struct dev_pm_opp *opp)
34{
35 debugfs_remove_recursive(opp->dentry);
36}
37
38static bool opp_debug_create_supplies(struct dev_pm_opp *opp,
39 struct opp_table *opp_table,
40 struct dentry *pdentry)
41{
42 struct dentry *d;
43 int i;
44
45 for (i = 0; i < opp_table->regulator_count; i++) {
46 char name[15];
47
48 snprintf(name, sizeof(name), "supply-%d", i);
49
50 /* Create per-opp directory */
51 d = debugfs_create_dir(name, pdentry);
52
53 if (!d)
54 return false;
55
56 if (!debugfs_create_ulong("u_volt_target", S_IRUGO, d,
57 &opp->supplies[i].u_volt))
58 return false;
59
60 if (!debugfs_create_ulong("u_volt_min", S_IRUGO, d,
61 &opp->supplies[i].u_volt_min))
62 return false;
63
64 if (!debugfs_create_ulong("u_volt_max", S_IRUGO, d,
65 &opp->supplies[i].u_volt_max))
66 return false;
67
68 if (!debugfs_create_ulong("u_amp", S_IRUGO, d,
69 &opp->supplies[i].u_amp))
70 return false;
71 }
72
73 return true;
74}
75
76int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table)
77{
78 struct dentry *pdentry = opp_table->dentry;
79 struct dentry *d;
80 char name[25]; /* 20 chars for 64 bit value + 5 (opp:\0) */
81
82 /* Rate is unique to each OPP, use it to give opp-name */
83 snprintf(name, sizeof(name), "opp:%lu", opp->rate);
84
85 /* Create per-opp directory */
86 d = debugfs_create_dir(name, pdentry);
87 if (!d)
88 return -ENOMEM;
89
90 if (!debugfs_create_bool("available", S_IRUGO, d, &opp->available))
91 return -ENOMEM;
92
93 if (!debugfs_create_bool("dynamic", S_IRUGO, d, &opp->dynamic))
94 return -ENOMEM;
95
96 if (!debugfs_create_bool("turbo", S_IRUGO, d, &opp->turbo))
97 return -ENOMEM;
98
99 if (!debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend))
100 return -ENOMEM;
101
102 if (!debugfs_create_u32("performance_state", S_IRUGO, d, &opp->pstate))
103 return -ENOMEM;
104
105 if (!debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate))
106 return -ENOMEM;
107
108 if (!opp_debug_create_supplies(opp, opp_table, d))
109 return -ENOMEM;
110
111 if (!debugfs_create_ulong("clock_latency_ns", S_IRUGO, d,
112 &opp->clock_latency_ns))
113 return -ENOMEM;
114
115 opp->dentry = d;
116 return 0;
117}
118
119static int opp_list_debug_create_dir(struct opp_device *opp_dev,
120 struct opp_table *opp_table)
121{
122 const struct device *dev = opp_dev->dev;
123 struct dentry *d;
124
125 opp_set_dev_name(dev, opp_table->dentry_name);
126
127 /* Create device specific directory */
128 d = debugfs_create_dir(opp_table->dentry_name, rootdir);
129 if (!d) {
130 dev_err(dev, "%s: Failed to create debugfs dir\n", __func__);
131 return -ENOMEM;
132 }
133
134 opp_dev->dentry = d;
135 opp_table->dentry = d;
136
137 return 0;
138}
139
140static int opp_list_debug_create_link(struct opp_device *opp_dev,
141 struct opp_table *opp_table)
142{
143 const struct device *dev = opp_dev->dev;
144 char name[NAME_MAX];
145 struct dentry *d;
146
147 opp_set_dev_name(opp_dev->dev, name);
148
149 /* Create device specific directory link */
150 d = debugfs_create_symlink(name, rootdir, opp_table->dentry_name);
151 if (!d) {
152 dev_err(dev, "%s: Failed to create link\n", __func__);
153 return -ENOMEM;
154 }
155
156 opp_dev->dentry = d;
157
158 return 0;
159}
160
161/**
162 * opp_debug_register - add a device opp node to the debugfs 'opp' directory
163 * @opp_dev: opp-dev pointer for device
164 * @opp_table: the device-opp being added
165 *
166 * Dynamically adds device specific directory in debugfs 'opp' directory. If the
167 * device-opp is shared with other devices, then links will be created for all
168 * devices except the first.
169 *
170 * Return: 0 on success, otherwise negative error.
171 */
172int opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table)
173{
174 if (!rootdir) {
175 pr_debug("%s: Uninitialized rootdir\n", __func__);
176 return -EINVAL;
177 }
178
179 if (opp_table->dentry)
180 return opp_list_debug_create_link(opp_dev, opp_table);
181
182 return opp_list_debug_create_dir(opp_dev, opp_table);
183}
184
185static void opp_migrate_dentry(struct opp_device *opp_dev,
186 struct opp_table *opp_table)
187{
188 struct opp_device *new_dev;
189 const struct device *dev;
190 struct dentry *dentry;
191
192 /* Look for next opp-dev */
193 list_for_each_entry(new_dev, &opp_table->dev_list, node)
194 if (new_dev != opp_dev)
195 break;
196
197 /* new_dev is guaranteed to be valid here */
198 dev = new_dev->dev;
199 debugfs_remove_recursive(new_dev->dentry);
200
201 opp_set_dev_name(dev, opp_table->dentry_name);
202
203 dentry = debugfs_rename(rootdir, opp_dev->dentry, rootdir,
204 opp_table->dentry_name);
205 if (!dentry) {
206 dev_err(dev, "%s: Failed to rename link from: %s to %s\n",
207 __func__, dev_name(opp_dev->dev), dev_name(dev));
208 return;
209 }
210
211 new_dev->dentry = dentry;
212 opp_table->dentry = dentry;
213}
214
215/**
216 * opp_debug_unregister - remove a device opp node from debugfs opp directory
217 * @opp_dev: opp-dev pointer for device
218 * @opp_table: the device-opp being removed
219 *
220 * Dynamically removes device specific directory from debugfs 'opp' directory.
221 */
222void opp_debug_unregister(struct opp_device *opp_dev,
223 struct opp_table *opp_table)
224{
225 if (opp_dev->dentry == opp_table->dentry) {
226 /* Move the real dentry object under another device */
227 if (!list_is_singular(&opp_table->dev_list)) {
228 opp_migrate_dentry(opp_dev, opp_table);
229 goto out;
230 }
231 opp_table->dentry = NULL;
232 }
233
234 debugfs_remove_recursive(opp_dev->dentry);
235
236out:
237 opp_dev->dentry = NULL;
238}
239
240static int __init opp_debug_init(void)
241{
242 /* Create /sys/kernel/debug/opp directory */
243 rootdir = debugfs_create_dir("opp", NULL);
244 if (!rootdir) {
245 pr_err("%s: Failed to create root directory\n", __func__);
246 return -ENOMEM;
247 }
248
249 return 0;
250}
251core_initcall(opp_debug_init);