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deaa5146 VK |
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> | |
dfbe4678 | 18 | #include <linux/slab.h> |
deaa5146 VK |
19 | |
20 | #include "opp.h" | |
21 | ||
22 | static struct dentry *rootdir; | |
23 | ||
24 | static 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 | ||
33 | void opp_debug_remove_one(struct dev_pm_opp *opp) | |
34 | { | |
35 | debugfs_remove_recursive(opp->dentry); | |
36 | } | |
37 | ||
dfbe4678 VK |
38 | static 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; | |
1fae788e | 43 | int i; |
dfbe4678 | 44 | |
1fae788e | 45 | for (i = 0; i < opp_table->regulator_count; i++) { |
d741029a AY |
46 | char name[15]; |
47 | ||
48 | snprintf(name, sizeof(name), "supply-%d", i); | |
dfbe4678 VK |
49 | |
50 | /* Create per-opp directory */ | |
51 | d = debugfs_create_dir(name, pdentry); | |
52 | ||
dfbe4678 VK |
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; | |
1fae788e | 71 | } |
dfbe4678 VK |
72 | |
73 | return true; | |
74 | } | |
75 | ||
2c2709dc | 76 | int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table) |
deaa5146 | 77 | { |
2c2709dc | 78 | struct dentry *pdentry = opp_table->dentry; |
deaa5146 VK |
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 | ||
009acd19 VK |
102 | if (!debugfs_create_u32("performance_state", S_IRUGO, d, &opp->pstate)) |
103 | return -ENOMEM; | |
104 | ||
deaa5146 VK |
105 | if (!debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate)) |
106 | return -ENOMEM; | |
107 | ||
dfbe4678 | 108 | if (!opp_debug_create_supplies(opp, opp_table, d)) |
deaa5146 VK |
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 | ||
2c2709dc VK |
119 | static int opp_list_debug_create_dir(struct opp_device *opp_dev, |
120 | struct opp_table *opp_table) | |
deaa5146 | 121 | { |
2c2709dc | 122 | const struct device *dev = opp_dev->dev; |
deaa5146 VK |
123 | struct dentry *d; |
124 | ||
2c2709dc | 125 | opp_set_dev_name(dev, opp_table->dentry_name); |
deaa5146 VK |
126 | |
127 | /* Create device specific directory */ | |
2c2709dc | 128 | d = debugfs_create_dir(opp_table->dentry_name, rootdir); |
deaa5146 VK |
129 | if (!d) { |
130 | dev_err(dev, "%s: Failed to create debugfs dir\n", __func__); | |
131 | return -ENOMEM; | |
132 | } | |
133 | ||
2c2709dc VK |
134 | opp_dev->dentry = d; |
135 | opp_table->dentry = d; | |
deaa5146 VK |
136 | |
137 | return 0; | |
138 | } | |
139 | ||
2c2709dc VK |
140 | static int opp_list_debug_create_link(struct opp_device *opp_dev, |
141 | struct opp_table *opp_table) | |
deaa5146 | 142 | { |
2c2709dc | 143 | const struct device *dev = opp_dev->dev; |
deaa5146 VK |
144 | char name[NAME_MAX]; |
145 | struct dentry *d; | |
146 | ||
2c2709dc | 147 | opp_set_dev_name(opp_dev->dev, name); |
deaa5146 VK |
148 | |
149 | /* Create device specific directory link */ | |
2c2709dc | 150 | d = debugfs_create_symlink(name, rootdir, opp_table->dentry_name); |
deaa5146 VK |
151 | if (!d) { |
152 | dev_err(dev, "%s: Failed to create link\n", __func__); | |
153 | return -ENOMEM; | |
154 | } | |
155 | ||
2c2709dc | 156 | opp_dev->dentry = d; |
deaa5146 VK |
157 | |
158 | return 0; | |
159 | } | |
160 | ||
161 | /** | |
162 | * opp_debug_register - add a device opp node to the debugfs 'opp' directory | |
2c2709dc VK |
163 | * @opp_dev: opp-dev pointer for device |
164 | * @opp_table: the device-opp being added | |
deaa5146 VK |
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 | */ | |
2c2709dc | 172 | int opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table) |
deaa5146 VK |
173 | { |
174 | if (!rootdir) { | |
175 | pr_debug("%s: Uninitialized rootdir\n", __func__); | |
176 | return -EINVAL; | |
177 | } | |
178 | ||
2c2709dc VK |
179 | if (opp_table->dentry) |
180 | return opp_list_debug_create_link(opp_dev, opp_table); | |
deaa5146 | 181 | |
2c2709dc | 182 | return opp_list_debug_create_dir(opp_dev, opp_table); |
deaa5146 VK |
183 | } |
184 | ||
2c2709dc VK |
185 | static void opp_migrate_dentry(struct opp_device *opp_dev, |
186 | struct opp_table *opp_table) | |
deaa5146 | 187 | { |
2c2709dc | 188 | struct opp_device *new_dev; |
deaa5146 VK |
189 | const struct device *dev; |
190 | struct dentry *dentry; | |
191 | ||
2c2709dc VK |
192 | /* Look for next opp-dev */ |
193 | list_for_each_entry(new_dev, &opp_table->dev_list, node) | |
194 | if (new_dev != opp_dev) | |
deaa5146 VK |
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 | ||
2c2709dc | 201 | opp_set_dev_name(dev, opp_table->dentry_name); |
deaa5146 | 202 | |
2c2709dc VK |
203 | dentry = debugfs_rename(rootdir, opp_dev->dentry, rootdir, |
204 | opp_table->dentry_name); | |
deaa5146 VK |
205 | if (!dentry) { |
206 | dev_err(dev, "%s: Failed to rename link from: %s to %s\n", | |
2c2709dc | 207 | __func__, dev_name(opp_dev->dev), dev_name(dev)); |
deaa5146 VK |
208 | return; |
209 | } | |
210 | ||
211 | new_dev->dentry = dentry; | |
2c2709dc | 212 | opp_table->dentry = dentry; |
deaa5146 VK |
213 | } |
214 | ||
215 | /** | |
216 | * opp_debug_unregister - remove a device opp node from debugfs opp directory | |
2c2709dc VK |
217 | * @opp_dev: opp-dev pointer for device |
218 | * @opp_table: the device-opp being removed | |
deaa5146 VK |
219 | * |
220 | * Dynamically removes device specific directory from debugfs 'opp' directory. | |
221 | */ | |
2c2709dc VK |
222 | void opp_debug_unregister(struct opp_device *opp_dev, |
223 | struct opp_table *opp_table) | |
deaa5146 | 224 | { |
2c2709dc | 225 | if (opp_dev->dentry == opp_table->dentry) { |
deaa5146 | 226 | /* Move the real dentry object under another device */ |
2c2709dc VK |
227 | if (!list_is_singular(&opp_table->dev_list)) { |
228 | opp_migrate_dentry(opp_dev, opp_table); | |
deaa5146 VK |
229 | goto out; |
230 | } | |
2c2709dc | 231 | opp_table->dentry = NULL; |
deaa5146 VK |
232 | } |
233 | ||
2c2709dc | 234 | debugfs_remove_recursive(opp_dev->dentry); |
deaa5146 VK |
235 | |
236 | out: | |
2c2709dc | 237 | opp_dev->dentry = NULL; |
deaa5146 VK |
238 | } |
239 | ||
240 | static 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 | } | |
251 | core_initcall(opp_debug_init); |