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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> | |
13 | #include <linux/init.h> | |
14 | #include <linux/limits.h> | |
dfbe4678 | 15 | #include <linux/slab.h> |
deaa5146 VK |
16 | |
17 | #include "opp.h" | |
18 | ||
19 | static struct dentry *rootdir; | |
20 | ||
21 | static void opp_set_dev_name(const struct device *dev, char *name) | |
22 | { | |
23 | if (dev->parent) | |
24 | snprintf(name, NAME_MAX, "%s-%s", dev_name(dev->parent), | |
25 | dev_name(dev)); | |
26 | else | |
27 | snprintf(name, NAME_MAX, "%s", dev_name(dev)); | |
28 | } | |
29 | ||
30 | void opp_debug_remove_one(struct dev_pm_opp *opp) | |
31 | { | |
32 | debugfs_remove_recursive(opp->dentry); | |
33 | } | |
34 | ||
0430b1d5 VK |
35 | static ssize_t bw_name_read(struct file *fp, char __user *userbuf, |
36 | size_t count, loff_t *ppos) | |
37 | { | |
38 | struct icc_path *path = fp->private_data; | |
39 | char buf[64]; | |
40 | int i; | |
41 | ||
42 | i = scnprintf(buf, sizeof(buf), "%.62s\n", icc_get_name(path)); | |
43 | ||
44 | return simple_read_from_buffer(userbuf, count, ppos, buf, i); | |
45 | } | |
46 | ||
47 | static const struct file_operations bw_name_fops = { | |
48 | .open = simple_open, | |
49 | .read = bw_name_read, | |
50 | .llseek = default_llseek, | |
51 | }; | |
52 | ||
53 | static void opp_debug_create_bw(struct dev_pm_opp *opp, | |
54 | struct opp_table *opp_table, | |
55 | struct dentry *pdentry) | |
56 | { | |
57 | struct dentry *d; | |
58 | char name[11]; | |
59 | int i; | |
60 | ||
61 | for (i = 0; i < opp_table->path_count; i++) { | |
62 | snprintf(name, sizeof(name), "icc-path-%.1d", i); | |
63 | ||
64 | /* Create per-path directory */ | |
65 | d = debugfs_create_dir(name, pdentry); | |
66 | ||
67 | debugfs_create_file("name", S_IRUGO, d, opp_table->paths[i], | |
68 | &bw_name_fops); | |
69 | debugfs_create_u32("peak_bw", S_IRUGO, d, | |
70 | &opp->bandwidth[i].peak); | |
71 | debugfs_create_u32("avg_bw", S_IRUGO, d, | |
72 | &opp->bandwidth[i].avg); | |
73 | } | |
74 | } | |
75 | ||
a2dea4cb | 76 | static void opp_debug_create_supplies(struct dev_pm_opp *opp, |
dfbe4678 VK |
77 | struct opp_table *opp_table, |
78 | struct dentry *pdentry) | |
79 | { | |
80 | struct dentry *d; | |
1fae788e | 81 | int i; |
dfbe4678 | 82 | |
1fae788e | 83 | for (i = 0; i < opp_table->regulator_count; i++) { |
d741029a AY |
84 | char name[15]; |
85 | ||
86 | snprintf(name, sizeof(name), "supply-%d", i); | |
dfbe4678 VK |
87 | |
88 | /* Create per-opp directory */ | |
89 | d = debugfs_create_dir(name, pdentry); | |
90 | ||
a2dea4cb GKH |
91 | debugfs_create_ulong("u_volt_target", S_IRUGO, d, |
92 | &opp->supplies[i].u_volt); | |
dfbe4678 | 93 | |
a2dea4cb GKH |
94 | debugfs_create_ulong("u_volt_min", S_IRUGO, d, |
95 | &opp->supplies[i].u_volt_min); | |
dfbe4678 | 96 | |
a2dea4cb GKH |
97 | debugfs_create_ulong("u_volt_max", S_IRUGO, d, |
98 | &opp->supplies[i].u_volt_max); | |
dfbe4678 | 99 | |
a2dea4cb GKH |
100 | debugfs_create_ulong("u_amp", S_IRUGO, d, |
101 | &opp->supplies[i].u_amp); | |
1fae788e | 102 | } |
dfbe4678 VK |
103 | } |
104 | ||
a2dea4cb | 105 | void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table) |
deaa5146 | 106 | { |
2c2709dc | 107 | struct dentry *pdentry = opp_table->dentry; |
deaa5146 | 108 | struct dentry *d; |
a1e8c136 | 109 | unsigned long id; |
deaa5146 VK |
110 | char name[25]; /* 20 chars for 64 bit value + 5 (opp:\0) */ |
111 | ||
a1e8c136 VK |
112 | /* |
113 | * Get directory name for OPP. | |
114 | * | |
115 | * - Normally rate is unique to each OPP, use it to get unique opp-name. | |
116 | * - For some devices rate isn't available, use index instead. | |
117 | */ | |
118 | if (likely(opp->rate)) | |
119 | id = opp->rate; | |
120 | else | |
121 | id = _get_opp_count(opp_table); | |
122 | ||
123 | snprintf(name, sizeof(name), "opp:%lu", id); | |
deaa5146 VK |
124 | |
125 | /* Create per-opp directory */ | |
126 | d = debugfs_create_dir(name, pdentry); | |
009acd19 | 127 | |
a2dea4cb GKH |
128 | debugfs_create_bool("available", S_IRUGO, d, &opp->available); |
129 | debugfs_create_bool("dynamic", S_IRUGO, d, &opp->dynamic); | |
130 | debugfs_create_bool("turbo", S_IRUGO, d, &opp->turbo); | |
131 | debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend); | |
132 | debugfs_create_u32("performance_state", S_IRUGO, d, &opp->pstate); | |
133 | debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate); | |
134 | debugfs_create_ulong("clock_latency_ns", S_IRUGO, d, | |
135 | &opp->clock_latency_ns); | |
deaa5146 | 136 | |
a2dea4cb | 137 | opp_debug_create_supplies(opp, opp_table, d); |
0430b1d5 | 138 | opp_debug_create_bw(opp, opp_table, d); |
deaa5146 VK |
139 | |
140 | opp->dentry = d; | |
deaa5146 VK |
141 | } |
142 | ||
a2dea4cb GKH |
143 | static void opp_list_debug_create_dir(struct opp_device *opp_dev, |
144 | struct opp_table *opp_table) | |
deaa5146 | 145 | { |
2c2709dc | 146 | const struct device *dev = opp_dev->dev; |
deaa5146 VK |
147 | struct dentry *d; |
148 | ||
2c2709dc | 149 | opp_set_dev_name(dev, opp_table->dentry_name); |
deaa5146 VK |
150 | |
151 | /* Create device specific directory */ | |
2c2709dc | 152 | d = debugfs_create_dir(opp_table->dentry_name, rootdir); |
deaa5146 | 153 | |
2c2709dc VK |
154 | opp_dev->dentry = d; |
155 | opp_table->dentry = d; | |
deaa5146 VK |
156 | } |
157 | ||
a2dea4cb GKH |
158 | static void opp_list_debug_create_link(struct opp_device *opp_dev, |
159 | struct opp_table *opp_table) | |
deaa5146 | 160 | { |
deaa5146 | 161 | char name[NAME_MAX]; |
deaa5146 | 162 | |
2c2709dc | 163 | opp_set_dev_name(opp_dev->dev, name); |
deaa5146 VK |
164 | |
165 | /* Create device specific directory link */ | |
a2dea4cb GKH |
166 | opp_dev->dentry = debugfs_create_symlink(name, rootdir, |
167 | opp_table->dentry_name); | |
deaa5146 VK |
168 | } |
169 | ||
170 | /** | |
171 | * opp_debug_register - add a device opp node to the debugfs 'opp' directory | |
2c2709dc VK |
172 | * @opp_dev: opp-dev pointer for device |
173 | * @opp_table: the device-opp being added | |
deaa5146 VK |
174 | * |
175 | * Dynamically adds device specific directory in debugfs 'opp' directory. If the | |
176 | * device-opp is shared with other devices, then links will be created for all | |
177 | * devices except the first. | |
deaa5146 | 178 | */ |
a2dea4cb | 179 | void opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table) |
deaa5146 | 180 | { |
2c2709dc | 181 | if (opp_table->dentry) |
a2dea4cb GKH |
182 | opp_list_debug_create_link(opp_dev, opp_table); |
183 | else | |
184 | opp_list_debug_create_dir(opp_dev, opp_table); | |
deaa5146 VK |
185 | } |
186 | ||
2c2709dc VK |
187 | static void opp_migrate_dentry(struct opp_device *opp_dev, |
188 | struct opp_table *opp_table) | |
deaa5146 | 189 | { |
2c2709dc | 190 | struct opp_device *new_dev; |
deaa5146 VK |
191 | const struct device *dev; |
192 | struct dentry *dentry; | |
193 | ||
2c2709dc VK |
194 | /* Look for next opp-dev */ |
195 | list_for_each_entry(new_dev, &opp_table->dev_list, node) | |
196 | if (new_dev != opp_dev) | |
deaa5146 VK |
197 | break; |
198 | ||
199 | /* new_dev is guaranteed to be valid here */ | |
200 | dev = new_dev->dev; | |
201 | debugfs_remove_recursive(new_dev->dentry); | |
202 | ||
2c2709dc | 203 | opp_set_dev_name(dev, opp_table->dentry_name); |
deaa5146 | 204 | |
2c2709dc VK |
205 | dentry = debugfs_rename(rootdir, opp_dev->dentry, rootdir, |
206 | opp_table->dentry_name); | |
deaa5146 VK |
207 | if (!dentry) { |
208 | dev_err(dev, "%s: Failed to rename link from: %s to %s\n", | |
2c2709dc | 209 | __func__, dev_name(opp_dev->dev), dev_name(dev)); |
deaa5146 VK |
210 | return; |
211 | } | |
212 | ||
213 | new_dev->dentry = dentry; | |
2c2709dc | 214 | opp_table->dentry = dentry; |
deaa5146 VK |
215 | } |
216 | ||
217 | /** | |
218 | * opp_debug_unregister - remove a device opp node from debugfs opp directory | |
2c2709dc VK |
219 | * @opp_dev: opp-dev pointer for device |
220 | * @opp_table: the device-opp being removed | |
deaa5146 VK |
221 | * |
222 | * Dynamically removes device specific directory from debugfs 'opp' directory. | |
223 | */ | |
2c2709dc VK |
224 | void opp_debug_unregister(struct opp_device *opp_dev, |
225 | struct opp_table *opp_table) | |
deaa5146 | 226 | { |
2c2709dc | 227 | if (opp_dev->dentry == opp_table->dentry) { |
deaa5146 | 228 | /* Move the real dentry object under another device */ |
2c2709dc VK |
229 | if (!list_is_singular(&opp_table->dev_list)) { |
230 | opp_migrate_dentry(opp_dev, opp_table); | |
deaa5146 VK |
231 | goto out; |
232 | } | |
2c2709dc | 233 | opp_table->dentry = NULL; |
deaa5146 VK |
234 | } |
235 | ||
2c2709dc | 236 | debugfs_remove_recursive(opp_dev->dentry); |
deaa5146 VK |
237 | |
238 | out: | |
2c2709dc | 239 | opp_dev->dentry = NULL; |
deaa5146 VK |
240 | } |
241 | ||
242 | static int __init opp_debug_init(void) | |
243 | { | |
244 | /* Create /sys/kernel/debug/opp directory */ | |
245 | rootdir = debugfs_create_dir("opp", NULL); | |
deaa5146 VK |
246 | |
247 | return 0; | |
248 | } | |
249 | core_initcall(opp_debug_init); |