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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
deaa5146 VK |
2 | /* |
3 | * Generic OPP debugfs interface | |
4 | * | |
5 | * Copyright (C) 2015-2016 Viresh Kumar <viresh.kumar@linaro.org> | |
deaa5146 VK |
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> | |
021dbeca | 13 | #include <linux/of.h> |
deaa5146 VK |
14 | #include <linux/init.h> |
15 | #include <linux/limits.h> | |
dfbe4678 | 16 | #include <linux/slab.h> |
deaa5146 VK |
17 | |
18 | #include "opp.h" | |
19 | ||
20 | static struct dentry *rootdir; | |
21 | ||
22 | static 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 | ||
31 | void opp_debug_remove_one(struct dev_pm_opp *opp) | |
32 | { | |
33 | debugfs_remove_recursive(opp->dentry); | |
34 | } | |
35 | ||
0430b1d5 VK |
36 | static 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 | ||
48 | static const struct file_operations bw_name_fops = { | |
49 | .open = simple_open, | |
50 | .read = bw_name_read, | |
51 | .llseek = default_llseek, | |
52 | }; | |
53 | ||
54 | static 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 | ||
a2dea4cb | 77 | static void opp_debug_create_supplies(struct dev_pm_opp *opp, |
dfbe4678 VK |
78 | struct opp_table *opp_table, |
79 | struct dentry *pdentry) | |
80 | { | |
81 | struct dentry *d; | |
1fae788e | 82 | int i; |
dfbe4678 | 83 | |
1fae788e | 84 | for (i = 0; i < opp_table->regulator_count; i++) { |
d741029a AY |
85 | char name[15]; |
86 | ||
87 | snprintf(name, sizeof(name), "supply-%d", i); | |
dfbe4678 VK |
88 | |
89 | /* Create per-opp directory */ | |
90 | d = debugfs_create_dir(name, pdentry); | |
91 | ||
a2dea4cb GKH |
92 | debugfs_create_ulong("u_volt_target", S_IRUGO, d, |
93 | &opp->supplies[i].u_volt); | |
dfbe4678 | 94 | |
a2dea4cb GKH |
95 | debugfs_create_ulong("u_volt_min", S_IRUGO, d, |
96 | &opp->supplies[i].u_volt_min); | |
dfbe4678 | 97 | |
a2dea4cb GKH |
98 | debugfs_create_ulong("u_volt_max", S_IRUGO, d, |
99 | &opp->supplies[i].u_volt_max); | |
dfbe4678 | 100 | |
a2dea4cb GKH |
101 | debugfs_create_ulong("u_amp", S_IRUGO, d, |
102 | &opp->supplies[i].u_amp); | |
4f9a7a1d LL |
103 | |
104 | debugfs_create_ulong("u_watt", S_IRUGO, d, | |
105 | &opp->supplies[i].u_watt); | |
1fae788e | 106 | } |
dfbe4678 VK |
107 | } |
108 | ||
a2dea4cb | 109 | void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table) |
deaa5146 | 110 | { |
2c2709dc | 111 | struct dentry *pdentry = opp_table->dentry; |
deaa5146 | 112 | struct dentry *d; |
a1e8c136 | 113 | unsigned long id; |
deaa5146 VK |
114 | char name[25]; /* 20 chars for 64 bit value + 5 (opp:\0) */ |
115 | ||
a1e8c136 VK |
116 | /* |
117 | * Get directory name for OPP. | |
118 | * | |
119 | * - Normally rate is unique to each OPP, use it to get unique opp-name. | |
120 | * - For some devices rate isn't available, use index instead. | |
121 | */ | |
122 | if (likely(opp->rate)) | |
123 | id = opp->rate; | |
124 | else | |
125 | id = _get_opp_count(opp_table); | |
126 | ||
127 | snprintf(name, sizeof(name), "opp:%lu", id); | |
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128 | |
129 | /* Create per-opp directory */ | |
130 | d = debugfs_create_dir(name, pdentry); | |
009acd19 | 131 | |
a2dea4cb GKH |
132 | debugfs_create_bool("available", S_IRUGO, d, &opp->available); |
133 | debugfs_create_bool("dynamic", S_IRUGO, d, &opp->dynamic); | |
134 | debugfs_create_bool("turbo", S_IRUGO, d, &opp->turbo); | |
135 | debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend); | |
136 | debugfs_create_u32("performance_state", S_IRUGO, d, &opp->pstate); | |
137 | debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate); | |
021dbeca | 138 | debugfs_create_u32("level", S_IRUGO, d, &opp->level); |
a2dea4cb GKH |
139 | debugfs_create_ulong("clock_latency_ns", S_IRUGO, d, |
140 | &opp->clock_latency_ns); | |
deaa5146 | 141 | |
021dbeca VK |
142 | opp->of_name = of_node_full_name(opp->np); |
143 | debugfs_create_str("of_name", S_IRUGO, d, (char **)&opp->of_name); | |
144 | ||
a2dea4cb | 145 | opp_debug_create_supplies(opp, opp_table, d); |
0430b1d5 | 146 | opp_debug_create_bw(opp, opp_table, d); |
deaa5146 VK |
147 | |
148 | opp->dentry = d; | |
deaa5146 VK |
149 | } |
150 | ||
a2dea4cb GKH |
151 | static void opp_list_debug_create_dir(struct opp_device *opp_dev, |
152 | struct opp_table *opp_table) | |
deaa5146 | 153 | { |
2c2709dc | 154 | const struct device *dev = opp_dev->dev; |
deaa5146 VK |
155 | struct dentry *d; |
156 | ||
2c2709dc | 157 | opp_set_dev_name(dev, opp_table->dentry_name); |
deaa5146 VK |
158 | |
159 | /* Create device specific directory */ | |
2c2709dc | 160 | d = debugfs_create_dir(opp_table->dentry_name, rootdir); |
deaa5146 | 161 | |
2c2709dc VK |
162 | opp_dev->dentry = d; |
163 | opp_table->dentry = d; | |
deaa5146 VK |
164 | } |
165 | ||
a2dea4cb GKH |
166 | static void opp_list_debug_create_link(struct opp_device *opp_dev, |
167 | struct opp_table *opp_table) | |
deaa5146 | 168 | { |
deaa5146 | 169 | char name[NAME_MAX]; |
deaa5146 | 170 | |
2c2709dc | 171 | opp_set_dev_name(opp_dev->dev, name); |
deaa5146 VK |
172 | |
173 | /* Create device specific directory link */ | |
a2dea4cb GKH |
174 | opp_dev->dentry = debugfs_create_symlink(name, rootdir, |
175 | opp_table->dentry_name); | |
deaa5146 VK |
176 | } |
177 | ||
178 | /** | |
179 | * opp_debug_register - add a device opp node to the debugfs 'opp' directory | |
2c2709dc VK |
180 | * @opp_dev: opp-dev pointer for device |
181 | * @opp_table: the device-opp being added | |
deaa5146 VK |
182 | * |
183 | * Dynamically adds device specific directory in debugfs 'opp' directory. If the | |
184 | * device-opp is shared with other devices, then links will be created for all | |
185 | * devices except the first. | |
deaa5146 | 186 | */ |
a2dea4cb | 187 | void opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table) |
deaa5146 | 188 | { |
2c2709dc | 189 | if (opp_table->dentry) |
a2dea4cb GKH |
190 | opp_list_debug_create_link(opp_dev, opp_table); |
191 | else | |
192 | opp_list_debug_create_dir(opp_dev, opp_table); | |
deaa5146 VK |
193 | } |
194 | ||
2c2709dc VK |
195 | static void opp_migrate_dentry(struct opp_device *opp_dev, |
196 | struct opp_table *opp_table) | |
deaa5146 | 197 | { |
2c2709dc | 198 | struct opp_device *new_dev; |
deaa5146 VK |
199 | const struct device *dev; |
200 | struct dentry *dentry; | |
201 | ||
2c2709dc VK |
202 | /* Look for next opp-dev */ |
203 | list_for_each_entry(new_dev, &opp_table->dev_list, node) | |
204 | if (new_dev != opp_dev) | |
deaa5146 VK |
205 | break; |
206 | ||
207 | /* new_dev is guaranteed to be valid here */ | |
208 | dev = new_dev->dev; | |
209 | debugfs_remove_recursive(new_dev->dentry); | |
210 | ||
2c2709dc | 211 | opp_set_dev_name(dev, opp_table->dentry_name); |
deaa5146 | 212 | |
2c2709dc VK |
213 | dentry = debugfs_rename(rootdir, opp_dev->dentry, rootdir, |
214 | opp_table->dentry_name); | |
deaa5146 VK |
215 | if (!dentry) { |
216 | dev_err(dev, "%s: Failed to rename link from: %s to %s\n", | |
2c2709dc | 217 | __func__, dev_name(opp_dev->dev), dev_name(dev)); |
deaa5146 VK |
218 | return; |
219 | } | |
220 | ||
221 | new_dev->dentry = dentry; | |
2c2709dc | 222 | opp_table->dentry = dentry; |
deaa5146 VK |
223 | } |
224 | ||
225 | /** | |
226 | * opp_debug_unregister - remove a device opp node from debugfs opp directory | |
2c2709dc VK |
227 | * @opp_dev: opp-dev pointer for device |
228 | * @opp_table: the device-opp being removed | |
deaa5146 VK |
229 | * |
230 | * Dynamically removes device specific directory from debugfs 'opp' directory. | |
231 | */ | |
2c2709dc VK |
232 | void opp_debug_unregister(struct opp_device *opp_dev, |
233 | struct opp_table *opp_table) | |
deaa5146 | 234 | { |
2c2709dc | 235 | if (opp_dev->dentry == opp_table->dentry) { |
deaa5146 | 236 | /* Move the real dentry object under another device */ |
2c2709dc VK |
237 | if (!list_is_singular(&opp_table->dev_list)) { |
238 | opp_migrate_dentry(opp_dev, opp_table); | |
deaa5146 VK |
239 | goto out; |
240 | } | |
2c2709dc | 241 | opp_table->dentry = NULL; |
deaa5146 VK |
242 | } |
243 | ||
2c2709dc | 244 | debugfs_remove_recursive(opp_dev->dentry); |
deaa5146 VK |
245 | |
246 | out: | |
2c2709dc | 247 | opp_dev->dentry = NULL; |
deaa5146 VK |
248 | } |
249 | ||
250 | static int __init opp_debug_init(void) | |
251 | { | |
252 | /* Create /sys/kernel/debug/opp directory */ | |
253 | rootdir = debugfs_create_dir("opp", NULL); | |
deaa5146 VK |
254 | |
255 | return 0; | |
256 | } | |
257 | core_initcall(opp_debug_init); |