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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Generic OPP debugfs interface4 *5 * Copyright (C) 2015-2016 Viresh Kumar <viresh.kumar@linaro.org>6 */7 8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt9 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 20static struct dentry *rootdir;21 22static 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 else28 snprintf(name, NAME_MAX, "%s", dev_name(dev));29}30 31void opp_debug_remove_one(struct dev_pm_opp *opp)32{33 debugfs_remove_recursive(opp->dentry);34}35 36static 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 const char *name = icc_get_name(path);41 char buf[64];42 int i = 0;43 44 if (name)45 i = scnprintf(buf, sizeof(buf), "%.62s\n", name);46 47 return simple_read_from_buffer(userbuf, count, ppos, buf, i);48}49 50static const struct file_operations bw_name_fops = {51 .open = simple_open,52 .read = bw_name_read,53 .llseek = default_llseek,54};55 56static void opp_debug_create_bw(struct dev_pm_opp *opp,57 struct opp_table *opp_table,58 struct dentry *pdentry)59{60 struct dentry *d;61 char name[] = "icc-path-XXXXXXXXXXX"; /* Integers can take 11 chars max */62 int i;63 64 for (i = 0; i < opp_table->path_count; i++) {65 snprintf(name, sizeof(name), "icc-path-%d", i);66 67 /* Create per-path directory */68 d = debugfs_create_dir(name, pdentry);69 70 debugfs_create_file("name", S_IRUGO, d, opp_table->paths[i],71 &bw_name_fops);72 debugfs_create_u32("peak_bw", S_IRUGO, d,73 &opp->bandwidth[i].peak);74 debugfs_create_u32("avg_bw", S_IRUGO, d,75 &opp->bandwidth[i].avg);76 }77}78 79static void opp_debug_create_clks(struct dev_pm_opp *opp,80 struct opp_table *opp_table,81 struct dentry *pdentry)82{83 char name[] = "rate_hz_XXXXXXXXXXX"; /* Integers can take 11 chars max */84 int i;85 86 if (opp_table->clk_count == 1) {87 debugfs_create_ulong("rate_hz", S_IRUGO, pdentry, &opp->rates[0]);88 return;89 }90 91 for (i = 0; i < opp_table->clk_count; i++) {92 snprintf(name, sizeof(name), "rate_hz_%d", i);93 debugfs_create_ulong(name, S_IRUGO, pdentry, &opp->rates[i]);94 }95}96 97static void opp_debug_create_supplies(struct dev_pm_opp *opp,98 struct opp_table *opp_table,99 struct dentry *pdentry)100{101 struct dentry *d;102 int i;103 104 for (i = 0; i < opp_table->regulator_count; i++) {105 char name[] = "supply-XXXXXXXXXXX"; /* Integers can take 11 chars max */106 107 snprintf(name, sizeof(name), "supply-%d", i);108 109 /* Create per-opp directory */110 d = debugfs_create_dir(name, pdentry);111 112 debugfs_create_ulong("u_volt_target", S_IRUGO, d,113 &opp->supplies[i].u_volt);114 115 debugfs_create_ulong("u_volt_min", S_IRUGO, d,116 &opp->supplies[i].u_volt_min);117 118 debugfs_create_ulong("u_volt_max", S_IRUGO, d,119 &opp->supplies[i].u_volt_max);120 121 debugfs_create_ulong("u_amp", S_IRUGO, d,122 &opp->supplies[i].u_amp);123 124 debugfs_create_ulong("u_watt", S_IRUGO, d,125 &opp->supplies[i].u_watt);126 }127}128 129void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table)130{131 struct dentry *pdentry = opp_table->dentry;132 struct dentry *d;133 unsigned long id;134 char name[25]; /* 20 chars for 64 bit value + 5 (opp:\0) */135 136 /*137 * Get directory name for OPP.138 *139 * - Normally rate is unique to each OPP, use it to get unique opp-name.140 * - For some devices rate isn't available or there are multiple, use141 * index instead for them.142 */143 if (likely(opp_table->clk_count == 1 && opp->rates[0]))144 id = opp->rates[0];145 else146 id = _get_opp_count(opp_table);147 148 snprintf(name, sizeof(name), "opp:%lu", id);149 150 /* Create per-opp directory */151 d = debugfs_create_dir(name, pdentry);152 153 debugfs_create_bool("available", S_IRUGO, d, &opp->available);154 debugfs_create_bool("dynamic", S_IRUGO, d, &opp->dynamic);155 debugfs_create_bool("turbo", S_IRUGO, d, &opp->turbo);156 debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend);157 debugfs_create_u32("level", S_IRUGO, d, &opp->level);158 debugfs_create_ulong("clock_latency_ns", S_IRUGO, d,159 &opp->clock_latency_ns);160 161 opp->of_name = of_node_full_name(opp->np);162 debugfs_create_str("of_name", S_IRUGO, d, (char **)&opp->of_name);163 164 opp_debug_create_clks(opp, opp_table, d);165 opp_debug_create_supplies(opp, opp_table, d);166 opp_debug_create_bw(opp, opp_table, d);167 168 opp->dentry = d;169}170 171static void opp_list_debug_create_dir(struct opp_device *opp_dev,172 struct opp_table *opp_table)173{174 const struct device *dev = opp_dev->dev;175 struct dentry *d;176 177 opp_set_dev_name(dev, opp_table->dentry_name);178 179 /* Create device specific directory */180 d = debugfs_create_dir(opp_table->dentry_name, rootdir);181 182 opp_dev->dentry = d;183 opp_table->dentry = d;184}185 186static void opp_list_debug_create_link(struct opp_device *opp_dev,187 struct opp_table *opp_table)188{189 char name[NAME_MAX];190 191 opp_set_dev_name(opp_dev->dev, name);192 193 /* Create device specific directory link */194 opp_dev->dentry = debugfs_create_symlink(name, rootdir,195 opp_table->dentry_name);196}197 198/**199 * opp_debug_register - add a device opp node to the debugfs 'opp' directory200 * @opp_dev: opp-dev pointer for device201 * @opp_table: the device-opp being added202 *203 * Dynamically adds device specific directory in debugfs 'opp' directory. If the204 * device-opp is shared with other devices, then links will be created for all205 * devices except the first.206 */207void opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table)208{209 if (opp_table->dentry)210 opp_list_debug_create_link(opp_dev, opp_table);211 else212 opp_list_debug_create_dir(opp_dev, opp_table);213}214 215static void opp_migrate_dentry(struct opp_device *opp_dev,216 struct opp_table *opp_table)217{218 struct opp_device *new_dev = NULL, *iter;219 const struct device *dev;220 struct dentry *dentry;221 222 /* Look for next opp-dev */223 list_for_each_entry(iter, &opp_table->dev_list, node)224 if (iter != opp_dev) {225 new_dev = iter;226 break;227 }228 229 BUG_ON(!new_dev);230 231 /* new_dev is guaranteed to be valid here */232 dev = new_dev->dev;233 debugfs_remove_recursive(new_dev->dentry);234 235 opp_set_dev_name(dev, opp_table->dentry_name);236 237 dentry = debugfs_rename(rootdir, opp_dev->dentry, rootdir,238 opp_table->dentry_name);239 if (IS_ERR(dentry)) {240 dev_err(dev, "%s: Failed to rename link from: %s to %s\n",241 __func__, dev_name(opp_dev->dev), dev_name(dev));242 return;243 }244 245 new_dev->dentry = dentry;246 opp_table->dentry = dentry;247}248 249/**250 * opp_debug_unregister - remove a device opp node from debugfs opp directory251 * @opp_dev: opp-dev pointer for device252 * @opp_table: the device-opp being removed253 *254 * Dynamically removes device specific directory from debugfs 'opp' directory.255 */256void opp_debug_unregister(struct opp_device *opp_dev,257 struct opp_table *opp_table)258{259 if (opp_dev->dentry == opp_table->dentry) {260 /* Move the real dentry object under another device */261 if (!list_is_singular(&opp_table->dev_list)) {262 opp_migrate_dentry(opp_dev, opp_table);263 goto out;264 }265 opp_table->dentry = NULL;266 }267 268 debugfs_remove_recursive(opp_dev->dentry);269 270out:271 opp_dev->dentry = NULL;272}273 274static int __init opp_debug_init(void)275{276 /* Create /sys/kernel/debug/opp directory */277 rootdir = debugfs_create_dir("opp", NULL);278 279 return 0;280}281core_initcall(opp_debug_init);282