1 // SPDX-License-Identifier: GPL-2.0-only
3 * Generic OPP debugfs interface
5 * Copyright (C) 2015-2016 Viresh Kumar <viresh.kumar@linaro.org>
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
15 #include <linux/slab.h>
19 static struct dentry *rootdir;
21 static void opp_set_dev_name(const struct device *dev, char *name)
24 snprintf(name, NAME_MAX, "%s-%s", dev_name(dev->parent),
27 snprintf(name, NAME_MAX, "%s", dev_name(dev));
30 void opp_debug_remove_one(struct dev_pm_opp *opp)
32 debugfs_remove_recursive(opp->dentry);
35 static ssize_t bw_name_read(struct file *fp, char __user *userbuf,
36 size_t count, loff_t *ppos)
38 struct icc_path *path = fp->private_data;
39 const char *name = icc_get_name(path);
44 i = scnprintf(buf, sizeof(buf), "%.62s\n", name);
46 return simple_read_from_buffer(userbuf, count, ppos, buf, i);
49 static const struct file_operations bw_name_fops = {
52 .llseek = default_llseek,
55 static void opp_debug_create_bw(struct dev_pm_opp *opp,
56 struct opp_table *opp_table,
57 struct dentry *pdentry)
63 for (i = 0; i < opp_table->path_count; i++) {
64 snprintf(name, sizeof(name), "icc-path-%.1d", i);
66 /* Create per-path directory */
67 d = debugfs_create_dir(name, pdentry);
69 debugfs_create_file("name", S_IRUGO, d, opp_table->paths[i],
71 debugfs_create_u32("peak_bw", S_IRUGO, d,
72 &opp->bandwidth[i].peak);
73 debugfs_create_u32("avg_bw", S_IRUGO, d,
74 &opp->bandwidth[i].avg);
78 static void opp_debug_create_supplies(struct dev_pm_opp *opp,
79 struct opp_table *opp_table,
80 struct dentry *pdentry)
85 for (i = 0; i < opp_table->regulator_count; i++) {
88 snprintf(name, sizeof(name), "supply-%d", i);
90 /* Create per-opp directory */
91 d = debugfs_create_dir(name, pdentry);
93 debugfs_create_ulong("u_volt_target", S_IRUGO, d,
94 &opp->supplies[i].u_volt);
96 debugfs_create_ulong("u_volt_min", S_IRUGO, d,
97 &opp->supplies[i].u_volt_min);
99 debugfs_create_ulong("u_volt_max", S_IRUGO, d,
100 &opp->supplies[i].u_volt_max);
102 debugfs_create_ulong("u_amp", S_IRUGO, d,
103 &opp->supplies[i].u_amp);
107 void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table)
109 struct dentry *pdentry = opp_table->dentry;
112 char name[25]; /* 20 chars for 64 bit value + 5 (opp:\0) */
115 * Get directory name for OPP.
117 * - Normally rate is unique to each OPP, use it to get unique opp-name.
118 * - For some devices rate isn't available, use index instead.
120 if (likely(opp->rate))
123 id = _get_opp_count(opp_table);
125 snprintf(name, sizeof(name), "opp:%lu", id);
127 /* Create per-opp directory */
128 d = debugfs_create_dir(name, pdentry);
130 debugfs_create_bool("available", S_IRUGO, d, &opp->available);
131 debugfs_create_bool("dynamic", S_IRUGO, d, &opp->dynamic);
132 debugfs_create_bool("turbo", S_IRUGO, d, &opp->turbo);
133 debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend);
134 debugfs_create_u32("performance_state", S_IRUGO, d, &opp->pstate);
135 debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate);
136 debugfs_create_ulong("clock_latency_ns", S_IRUGO, d,
137 &opp->clock_latency_ns);
139 opp_debug_create_supplies(opp, opp_table, d);
140 opp_debug_create_bw(opp, opp_table, d);
145 static void opp_list_debug_create_dir(struct opp_device *opp_dev,
146 struct opp_table *opp_table)
148 const struct device *dev = opp_dev->dev;
151 opp_set_dev_name(dev, opp_table->dentry_name);
153 /* Create device specific directory */
154 d = debugfs_create_dir(opp_table->dentry_name, rootdir);
157 opp_table->dentry = d;
160 static void opp_list_debug_create_link(struct opp_device *opp_dev,
161 struct opp_table *opp_table)
165 opp_set_dev_name(opp_dev->dev, name);
167 /* Create device specific directory link */
168 opp_dev->dentry = debugfs_create_symlink(name, rootdir,
169 opp_table->dentry_name);
173 * opp_debug_register - add a device opp node to the debugfs 'opp' directory
174 * @opp_dev: opp-dev pointer for device
175 * @opp_table: the device-opp being added
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.
181 void opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table)
183 if (opp_table->dentry)
184 opp_list_debug_create_link(opp_dev, opp_table);
186 opp_list_debug_create_dir(opp_dev, opp_table);
189 static void opp_migrate_dentry(struct opp_device *opp_dev,
190 struct opp_table *opp_table)
192 struct opp_device *new_dev;
193 const struct device *dev;
194 struct dentry *dentry;
196 /* Look for next opp-dev */
197 list_for_each_entry(new_dev, &opp_table->dev_list, node)
198 if (new_dev != opp_dev)
201 /* new_dev is guaranteed to be valid here */
203 debugfs_remove_recursive(new_dev->dentry);
205 opp_set_dev_name(dev, opp_table->dentry_name);
207 dentry = debugfs_rename(rootdir, opp_dev->dentry, rootdir,
208 opp_table->dentry_name);
209 if (IS_ERR(dentry)) {
210 dev_err(dev, "%s: Failed to rename link from: %s to %s\n",
211 __func__, dev_name(opp_dev->dev), dev_name(dev));
215 new_dev->dentry = dentry;
216 opp_table->dentry = dentry;
220 * opp_debug_unregister - remove a device opp node from debugfs opp directory
221 * @opp_dev: opp-dev pointer for device
222 * @opp_table: the device-opp being removed
224 * Dynamically removes device specific directory from debugfs 'opp' directory.
226 void opp_debug_unregister(struct opp_device *opp_dev,
227 struct opp_table *opp_table)
229 if (opp_dev->dentry == opp_table->dentry) {
230 /* Move the real dentry object under another device */
231 if (!list_is_singular(&opp_table->dev_list)) {
232 opp_migrate_dentry(opp_dev, opp_table);
235 opp_table->dentry = NULL;
238 debugfs_remove_recursive(opp_dev->dentry);
241 opp_dev->dentry = NULL;
244 static int __init opp_debug_init(void)
246 /* Create /sys/kernel/debug/opp directory */
247 rootdir = debugfs_create_dir("opp", NULL);
251 core_initcall(opp_debug_init);