Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 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> |
Viresh Kumar | dfbe467 | 2016-12-01 16:28:19 +0530 | [diff] [blame] | 18 | #include <linux/slab.h> |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 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 | |
Viresh Kumar | dfbe467 | 2016-12-01 16:28:19 +0530 | [diff] [blame] | 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; |
Viresh Kumar | 1fae788 | 2017-05-23 09:32:13 +0530 | [diff] [blame] | 43 | int i; |
Viresh Kumar | dfbe467 | 2016-12-01 16:28:19 +0530 | [diff] [blame] | 44 | |
Viresh Kumar | 1fae788 | 2017-05-23 09:32:13 +0530 | [diff] [blame] | 45 | for (i = 0; i < opp_table->regulator_count; i++) { |
Arvind Yadav | d741029 | 2017-09-21 11:15:36 +0530 | [diff] [blame] | 46 | char name[15]; |
| 47 | |
| 48 | snprintf(name, sizeof(name), "supply-%d", i); |
Viresh Kumar | dfbe467 | 2016-12-01 16:28:19 +0530 | [diff] [blame] | 49 | |
| 50 | /* Create per-opp directory */ |
| 51 | d = debugfs_create_dir(name, pdentry); |
| 52 | |
Viresh Kumar | dfbe467 | 2016-12-01 16:28:19 +0530 | [diff] [blame] | 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; |
Viresh Kumar | 1fae788 | 2017-05-23 09:32:13 +0530 | [diff] [blame] | 71 | } |
Viresh Kumar | dfbe467 | 2016-12-01 16:28:19 +0530 | [diff] [blame] | 72 | |
| 73 | return true; |
| 74 | } |
| 75 | |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 76 | int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table) |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 77 | { |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 78 | struct dentry *pdentry = opp_table->dentry; |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 79 | struct dentry *d; |
Viresh Kumar | a1e8c13 | 2018-04-06 14:35:45 +0530 | [diff] [blame] | 80 | unsigned long id; |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 81 | char name[25]; /* 20 chars for 64 bit value + 5 (opp:\0) */ |
| 82 | |
Viresh Kumar | a1e8c13 | 2018-04-06 14:35:45 +0530 | [diff] [blame] | 83 | /* |
| 84 | * Get directory name for OPP. |
| 85 | * |
| 86 | * - Normally rate is unique to each OPP, use it to get unique opp-name. |
| 87 | * - For some devices rate isn't available, use index instead. |
| 88 | */ |
| 89 | if (likely(opp->rate)) |
| 90 | id = opp->rate; |
| 91 | else |
| 92 | id = _get_opp_count(opp_table); |
| 93 | |
| 94 | snprintf(name, sizeof(name), "opp:%lu", id); |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 95 | |
| 96 | /* Create per-opp directory */ |
| 97 | d = debugfs_create_dir(name, pdentry); |
| 98 | if (!d) |
| 99 | return -ENOMEM; |
| 100 | |
| 101 | if (!debugfs_create_bool("available", S_IRUGO, d, &opp->available)) |
| 102 | return -ENOMEM; |
| 103 | |
| 104 | if (!debugfs_create_bool("dynamic", S_IRUGO, d, &opp->dynamic)) |
| 105 | return -ENOMEM; |
| 106 | |
| 107 | if (!debugfs_create_bool("turbo", S_IRUGO, d, &opp->turbo)) |
| 108 | return -ENOMEM; |
| 109 | |
| 110 | if (!debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend)) |
| 111 | return -ENOMEM; |
| 112 | |
Viresh Kumar | 009acd1 | 2017-10-11 12:54:14 +0530 | [diff] [blame] | 113 | if (!debugfs_create_u32("performance_state", S_IRUGO, d, &opp->pstate)) |
| 114 | return -ENOMEM; |
| 115 | |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 116 | if (!debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate)) |
| 117 | return -ENOMEM; |
| 118 | |
Viresh Kumar | dfbe467 | 2016-12-01 16:28:19 +0530 | [diff] [blame] | 119 | if (!opp_debug_create_supplies(opp, opp_table, d)) |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 120 | return -ENOMEM; |
| 121 | |
| 122 | if (!debugfs_create_ulong("clock_latency_ns", S_IRUGO, d, |
| 123 | &opp->clock_latency_ns)) |
| 124 | return -ENOMEM; |
| 125 | |
| 126 | opp->dentry = d; |
| 127 | return 0; |
| 128 | } |
| 129 | |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 130 | static int opp_list_debug_create_dir(struct opp_device *opp_dev, |
| 131 | struct opp_table *opp_table) |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 132 | { |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 133 | const struct device *dev = opp_dev->dev; |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 134 | struct dentry *d; |
| 135 | |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 136 | opp_set_dev_name(dev, opp_table->dentry_name); |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 137 | |
| 138 | /* Create device specific directory */ |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 139 | d = debugfs_create_dir(opp_table->dentry_name, rootdir); |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 140 | if (!d) { |
| 141 | dev_err(dev, "%s: Failed to create debugfs dir\n", __func__); |
| 142 | return -ENOMEM; |
| 143 | } |
| 144 | |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 145 | opp_dev->dentry = d; |
| 146 | opp_table->dentry = d; |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 147 | |
| 148 | return 0; |
| 149 | } |
| 150 | |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 151 | static int opp_list_debug_create_link(struct opp_device *opp_dev, |
| 152 | struct opp_table *opp_table) |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 153 | { |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 154 | const struct device *dev = opp_dev->dev; |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 155 | char name[NAME_MAX]; |
| 156 | struct dentry *d; |
| 157 | |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 158 | opp_set_dev_name(opp_dev->dev, name); |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 159 | |
| 160 | /* Create device specific directory link */ |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 161 | d = debugfs_create_symlink(name, rootdir, opp_table->dentry_name); |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 162 | if (!d) { |
| 163 | dev_err(dev, "%s: Failed to create link\n", __func__); |
| 164 | return -ENOMEM; |
| 165 | } |
| 166 | |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 167 | opp_dev->dentry = d; |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 168 | |
| 169 | return 0; |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * opp_debug_register - add a device opp node to the debugfs 'opp' directory |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 174 | * @opp_dev: opp-dev pointer for device |
| 175 | * @opp_table: the device-opp being added |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 176 | * |
| 177 | * Dynamically adds device specific directory in debugfs 'opp' directory. If the |
| 178 | * device-opp is shared with other devices, then links will be created for all |
| 179 | * devices except the first. |
| 180 | * |
| 181 | * Return: 0 on success, otherwise negative error. |
| 182 | */ |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 183 | int opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table) |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 184 | { |
| 185 | if (!rootdir) { |
| 186 | pr_debug("%s: Uninitialized rootdir\n", __func__); |
| 187 | return -EINVAL; |
| 188 | } |
| 189 | |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 190 | if (opp_table->dentry) |
| 191 | return opp_list_debug_create_link(opp_dev, opp_table); |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 192 | |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 193 | return opp_list_debug_create_dir(opp_dev, opp_table); |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 194 | } |
| 195 | |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 196 | static void opp_migrate_dentry(struct opp_device *opp_dev, |
| 197 | struct opp_table *opp_table) |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 198 | { |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 199 | struct opp_device *new_dev; |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 200 | const struct device *dev; |
| 201 | struct dentry *dentry; |
| 202 | |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 203 | /* Look for next opp-dev */ |
| 204 | list_for_each_entry(new_dev, &opp_table->dev_list, node) |
| 205 | if (new_dev != opp_dev) |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 206 | break; |
| 207 | |
| 208 | /* new_dev is guaranteed to be valid here */ |
| 209 | dev = new_dev->dev; |
| 210 | debugfs_remove_recursive(new_dev->dentry); |
| 211 | |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 212 | opp_set_dev_name(dev, opp_table->dentry_name); |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 213 | |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 214 | dentry = debugfs_rename(rootdir, opp_dev->dentry, rootdir, |
| 215 | opp_table->dentry_name); |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 216 | if (!dentry) { |
| 217 | dev_err(dev, "%s: Failed to rename link from: %s to %s\n", |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 218 | __func__, dev_name(opp_dev->dev), dev_name(dev)); |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 219 | return; |
| 220 | } |
| 221 | |
| 222 | new_dev->dentry = dentry; |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 223 | opp_table->dentry = dentry; |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 224 | } |
| 225 | |
| 226 | /** |
| 227 | * opp_debug_unregister - remove a device opp node from debugfs opp directory |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 228 | * @opp_dev: opp-dev pointer for device |
| 229 | * @opp_table: the device-opp being removed |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 230 | * |
| 231 | * Dynamically removes device specific directory from debugfs 'opp' directory. |
| 232 | */ |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 233 | void opp_debug_unregister(struct opp_device *opp_dev, |
| 234 | struct opp_table *opp_table) |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 235 | { |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 236 | if (opp_dev->dentry == opp_table->dentry) { |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 237 | /* Move the real dentry object under another device */ |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 238 | if (!list_is_singular(&opp_table->dev_list)) { |
| 239 | opp_migrate_dentry(opp_dev, opp_table); |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 240 | goto out; |
| 241 | } |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 242 | opp_table->dentry = NULL; |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 243 | } |
| 244 | |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 245 | debugfs_remove_recursive(opp_dev->dentry); |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 246 | |
| 247 | out: |
Viresh Kumar | 2c2709d | 2016-02-16 14:17:53 +0530 | [diff] [blame] | 248 | opp_dev->dentry = NULL; |
Viresh Kumar | deaa514 | 2015-11-11 07:59:01 +0530 | [diff] [blame] | 249 | } |
| 250 | |
| 251 | static int __init opp_debug_init(void) |
| 252 | { |
| 253 | /* Create /sys/kernel/debug/opp directory */ |
| 254 | rootdir = debugfs_create_dir("opp", NULL); |
| 255 | if (!rootdir) { |
| 256 | pr_err("%s: Failed to create root directory\n", __func__); |
| 257 | return -ENOMEM; |
| 258 | } |
| 259 | |
| 260 | return 0; |
| 261 | } |
| 262 | core_initcall(opp_debug_init); |