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