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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> |
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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 | ||
a2dea4cb | 35 | static void opp_debug_create_supplies(struct dev_pm_opp *opp, |
dfbe4678 VK |
36 | struct opp_table *opp_table, |
37 | struct dentry *pdentry) | |
38 | { | |
39 | struct dentry *d; | |
1fae788e | 40 | int i; |
dfbe4678 | 41 | |
1fae788e | 42 | for (i = 0; i < opp_table->regulator_count; i++) { |
d741029a AY |
43 | char name[15]; |
44 | ||
45 | snprintf(name, sizeof(name), "supply-%d", i); | |
dfbe4678 VK |
46 | |
47 | /* Create per-opp directory */ | |
48 | d = debugfs_create_dir(name, pdentry); | |
49 | ||
a2dea4cb GKH |
50 | debugfs_create_ulong("u_volt_target", S_IRUGO, d, |
51 | &opp->supplies[i].u_volt); | |
dfbe4678 | 52 | |
a2dea4cb GKH |
53 | debugfs_create_ulong("u_volt_min", S_IRUGO, d, |
54 | &opp->supplies[i].u_volt_min); | |
dfbe4678 | 55 | |
a2dea4cb GKH |
56 | debugfs_create_ulong("u_volt_max", S_IRUGO, d, |
57 | &opp->supplies[i].u_volt_max); | |
dfbe4678 | 58 | |
a2dea4cb GKH |
59 | debugfs_create_ulong("u_amp", S_IRUGO, d, |
60 | &opp->supplies[i].u_amp); | |
1fae788e | 61 | } |
dfbe4678 VK |
62 | } |
63 | ||
a2dea4cb | 64 | void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table) |
deaa5146 | 65 | { |
2c2709dc | 66 | struct dentry *pdentry = opp_table->dentry; |
deaa5146 | 67 | struct dentry *d; |
a1e8c136 | 68 | unsigned long id; |
deaa5146 VK |
69 | char name[25]; /* 20 chars for 64 bit value + 5 (opp:\0) */ |
70 | ||
a1e8c136 VK |
71 | /* |
72 | * Get directory name for OPP. | |
73 | * | |
74 | * - Normally rate is unique to each OPP, use it to get unique opp-name. | |
75 | * - For some devices rate isn't available, use index instead. | |
76 | */ | |
77 | if (likely(opp->rate)) | |
78 | id = opp->rate; | |
79 | else | |
80 | id = _get_opp_count(opp_table); | |
81 | ||
82 | snprintf(name, sizeof(name), "opp:%lu", id); | |
deaa5146 VK |
83 | |
84 | /* Create per-opp directory */ | |
85 | d = debugfs_create_dir(name, pdentry); | |
009acd19 | 86 | |
a2dea4cb GKH |
87 | debugfs_create_bool("available", S_IRUGO, d, &opp->available); |
88 | debugfs_create_bool("dynamic", S_IRUGO, d, &opp->dynamic); | |
89 | debugfs_create_bool("turbo", S_IRUGO, d, &opp->turbo); | |
90 | debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend); | |
91 | debugfs_create_u32("performance_state", S_IRUGO, d, &opp->pstate); | |
92 | debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate); | |
93 | debugfs_create_ulong("clock_latency_ns", S_IRUGO, d, | |
94 | &opp->clock_latency_ns); | |
deaa5146 | 95 | |
a2dea4cb | 96 | opp_debug_create_supplies(opp, opp_table, d); |
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97 | |
98 | opp->dentry = d; | |
deaa5146 VK |
99 | } |
100 | ||
a2dea4cb GKH |
101 | static void opp_list_debug_create_dir(struct opp_device *opp_dev, |
102 | struct opp_table *opp_table) | |
deaa5146 | 103 | { |
2c2709dc | 104 | const struct device *dev = opp_dev->dev; |
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105 | struct dentry *d; |
106 | ||
2c2709dc | 107 | opp_set_dev_name(dev, opp_table->dentry_name); |
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108 | |
109 | /* Create device specific directory */ | |
2c2709dc | 110 | d = debugfs_create_dir(opp_table->dentry_name, rootdir); |
deaa5146 | 111 | |
2c2709dc VK |
112 | opp_dev->dentry = d; |
113 | opp_table->dentry = d; | |
deaa5146 VK |
114 | } |
115 | ||
a2dea4cb GKH |
116 | static void opp_list_debug_create_link(struct opp_device *opp_dev, |
117 | struct opp_table *opp_table) | |
deaa5146 | 118 | { |
deaa5146 | 119 | char name[NAME_MAX]; |
deaa5146 | 120 | |
2c2709dc | 121 | opp_set_dev_name(opp_dev->dev, name); |
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122 | |
123 | /* Create device specific directory link */ | |
a2dea4cb GKH |
124 | opp_dev->dentry = debugfs_create_symlink(name, rootdir, |
125 | opp_table->dentry_name); | |
deaa5146 VK |
126 | } |
127 | ||
128 | /** | |
129 | * opp_debug_register - add a device opp node to the debugfs 'opp' directory | |
2c2709dc VK |
130 | * @opp_dev: opp-dev pointer for device |
131 | * @opp_table: the device-opp being added | |
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132 | * |
133 | * Dynamically adds device specific directory in debugfs 'opp' directory. If the | |
134 | * device-opp is shared with other devices, then links will be created for all | |
135 | * devices except the first. | |
deaa5146 | 136 | */ |
a2dea4cb | 137 | void opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table) |
deaa5146 | 138 | { |
2c2709dc | 139 | if (opp_table->dentry) |
a2dea4cb GKH |
140 | opp_list_debug_create_link(opp_dev, opp_table); |
141 | else | |
142 | opp_list_debug_create_dir(opp_dev, opp_table); | |
deaa5146 VK |
143 | } |
144 | ||
2c2709dc VK |
145 | static void opp_migrate_dentry(struct opp_device *opp_dev, |
146 | struct opp_table *opp_table) | |
deaa5146 | 147 | { |
2c2709dc | 148 | struct opp_device *new_dev; |
deaa5146 VK |
149 | const struct device *dev; |
150 | struct dentry *dentry; | |
151 | ||
2c2709dc VK |
152 | /* Look for next opp-dev */ |
153 | list_for_each_entry(new_dev, &opp_table->dev_list, node) | |
154 | if (new_dev != opp_dev) | |
deaa5146 VK |
155 | break; |
156 | ||
157 | /* new_dev is guaranteed to be valid here */ | |
158 | dev = new_dev->dev; | |
159 | debugfs_remove_recursive(new_dev->dentry); | |
160 | ||
2c2709dc | 161 | opp_set_dev_name(dev, opp_table->dentry_name); |
deaa5146 | 162 | |
2c2709dc VK |
163 | dentry = debugfs_rename(rootdir, opp_dev->dentry, rootdir, |
164 | opp_table->dentry_name); | |
deaa5146 VK |
165 | if (!dentry) { |
166 | dev_err(dev, "%s: Failed to rename link from: %s to %s\n", | |
2c2709dc | 167 | __func__, dev_name(opp_dev->dev), dev_name(dev)); |
deaa5146 VK |
168 | return; |
169 | } | |
170 | ||
171 | new_dev->dentry = dentry; | |
2c2709dc | 172 | opp_table->dentry = dentry; |
deaa5146 VK |
173 | } |
174 | ||
175 | /** | |
176 | * opp_debug_unregister - remove a device opp node from debugfs opp directory | |
2c2709dc VK |
177 | * @opp_dev: opp-dev pointer for device |
178 | * @opp_table: the device-opp being removed | |
deaa5146 VK |
179 | * |
180 | * Dynamically removes device specific directory from debugfs 'opp' directory. | |
181 | */ | |
2c2709dc VK |
182 | void opp_debug_unregister(struct opp_device *opp_dev, |
183 | struct opp_table *opp_table) | |
deaa5146 | 184 | { |
2c2709dc | 185 | if (opp_dev->dentry == opp_table->dentry) { |
deaa5146 | 186 | /* Move the real dentry object under another device */ |
2c2709dc VK |
187 | if (!list_is_singular(&opp_table->dev_list)) { |
188 | opp_migrate_dentry(opp_dev, opp_table); | |
deaa5146 VK |
189 | goto out; |
190 | } | |
2c2709dc | 191 | opp_table->dentry = NULL; |
deaa5146 VK |
192 | } |
193 | ||
2c2709dc | 194 | debugfs_remove_recursive(opp_dev->dentry); |
deaa5146 VK |
195 | |
196 | out: | |
2c2709dc | 197 | opp_dev->dentry = NULL; |
deaa5146 VK |
198 | } |
199 | ||
200 | static int __init opp_debug_init(void) | |
201 | { | |
202 | /* Create /sys/kernel/debug/opp directory */ | |
203 | rootdir = debugfs_create_dir("opp", NULL); | |
deaa5146 VK |
204 | |
205 | return 0; | |
206 | } | |
207 | core_initcall(opp_debug_init); |