summaryrefslogtreecommitdiffstats
path: root/drivers/opp/debugfs.c
blob: 96a30a032c5f990f4df75b217becaf87d6c8c873 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Generic OPP debugfs interface
 *
 * Copyright (C) 2015-2016 Viresh Kumar <viresh.kumar@linaro.org>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/init.h>
#include <linux/limits.h>
#include <linux/slab.h>

#include "opp.h"

static struct dentry *rootdir;

static void opp_set_dev_name(const struct device *dev, char *name)
{
	if (dev->parent)
		snprintf(name, NAME_MAX, "%s-%s", dev_name(dev->parent),
			 dev_name(dev));
	else
		snprintf(name, NAME_MAX, "%s", dev_name(dev));
}

void opp_debug_remove_one(struct dev_pm_opp *opp)
{
	debugfs_remove_recursive(opp->dentry);
}

static ssize_t bw_name_read(struct file *fp, char __user *userbuf,
			    size_t count, loff_t *ppos)
{
	struct icc_path *path = fp->private_data;
	char buf[64];
	int i;

	i = scnprintf(buf, sizeof(buf), "%.62s\n", icc_get_name(path));

	return simple_read_from_buffer(userbuf, count, ppos, buf, i);
}

static const struct file_operations bw_name_fops = {
	.open = simple_open,
	.read = bw_name_read,
	.llseek = default_llseek,
};

static void opp_debug_create_bw(struct dev_pm_opp *opp,
				struct opp_table *opp_table,
				struct dentry *pdentry)
{
	struct dentry *d;
	char name[11];
	int i;

	for (i = 0; i < opp_table->path_count; i++) {
		snprintf(name, sizeof(name), "icc-path-%.1d", i);

		/* Create per-path directory */
		d = debugfs_create_dir(name, pdentry);

		debugfs_create_file("name", S_IRUGO, d, opp_table->paths[i],
				    &bw_name_fops);
		debugfs_create_u32("peak_bw", S_IRUGO, d,
				   &opp->bandwidth[i].peak);
		debugfs_create_u32("avg_bw", S_IRUGO, d,
				   &opp->bandwidth[i].avg);
	}
}

static void opp_debug_create_clks(struct dev_pm_opp *opp,
				  struct opp_table *opp_table,
				  struct dentry *pdentry)
{
	char name[12];
	int i;

	if (opp_table->clk_count == 1) {
		debugfs_create_ulong("rate_hz", S_IRUGO, pdentry, &opp->rates[0]);
		return;
	}

	for (i = 0; i < opp_table->clk_count; i++) {
		snprintf(name, sizeof(name), "rate_hz_%d", i);
		debugfs_create_ulong(name, S_IRUGO, pdentry, &opp->rates[i]);
	}
}

static void opp_debug_create_supplies(struct dev_pm_opp *opp,
				      struct opp_table *opp_table,
				      struct dentry *pdentry)
{
	struct dentry *d;
	int i;

	for (i = 0; i < opp_table->regulator_count; i++) {
		char name[15];

		snprintf(name, sizeof(name), "supply-%d", i);

		/* Create per-opp directory */
		d = debugfs_create_dir(name, pdentry);

		debugfs_create_ulong("u_volt_target", S_IRUGO, d,
				     &opp->supplies[i].u_volt);

		debugfs_create_ulong("u_volt_min", S_IRUGO, d,
				     &opp->supplies[i].u_volt_min);

		debugfs_create_ulong("u_volt_max", S_IRUGO, d,
				     &opp->supplies[i].u_volt_max);

		debugfs_create_ulong("u_amp", S_IRUGO, d,
				     &opp->supplies[i].u_amp);

		debugfs_create_ulong("u_watt", S_IRUGO, d,
				     &opp->supplies[i].u_watt);
	}
}

void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table)
{
	struct dentry *pdentry = opp_table->dentry;
	struct dentry *d;
	unsigned long id;
	char name[25];	/* 20 chars for 64 bit value + 5 (opp:\0) */

	/*
	 * Get directory name for OPP.
	 *
	 * - Normally rate is unique to each OPP, use it to get unique opp-name.
	 * - For some devices rate isn't available or there are multiple, use
	 *   index instead for them.
	 */
	if (likely(opp_table->clk_count == 1 && opp->rates[0]))
		id = opp->rates[0];
	else
		id = _get_opp_count(opp_table);

	snprintf(name, sizeof(name), "opp:%lu", id);

	/* Create per-opp directory */
	d = debugfs_create_dir(name, pdentry);

	debugfs_create_bool("available", S_IRUGO, d, &opp->available);
	debugfs_create_bool("dynamic", S_IRUGO, d, &opp->dynamic);
	debugfs_create_bool("turbo", S_IRUGO, d, &opp->turbo);
	debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend);
	debugfs_create_u32("performance_state", S_IRUGO, d, &opp->pstate);
	debugfs_create_u32("level", S_IRUGO, d, &opp->level);
	debugfs_create_ulong("clock_latency_ns", S_IRUGO, d,
			     &opp->clock_latency_ns);

	opp->of_name = of_node_full_name(opp->np);
	debugfs_create_str("of_name", S_IRUGO, d, (char **)&opp->of_name);

	opp_debug_create_clks(opp, opp_table, d);
	opp_debug_create_supplies(opp, opp_table, d);
	opp_debug_create_bw(opp, opp_table, d);

	opp->dentry = d;
}

static void opp_list_debug_create_dir(struct opp_device *opp_dev,
				      struct opp_table *opp_table)
{
	const struct device *dev = opp_dev->dev;
	struct dentry *d;

	opp_set_dev_name(dev, opp_table->dentry_name);

	/* Create device specific directory */
	d = debugfs_create_dir(opp_table->dentry_name, rootdir);

	opp_dev->dentry = d;
	opp_table->dentry = d;
}

static void opp_list_debug_create_link(struct opp_device *opp_dev,
				       struct opp_table *opp_table)
{
	char name[NAME_MAX];

	opp_set_dev_name(opp_dev->dev, name);

	/* Create device specific directory link */
	opp_dev->dentry = debugfs_create_symlink(name, rootdir,
						 opp_table->dentry_name);
}

/**
 * opp_debug_register - add a device opp node to the debugfs 'opp' directory
 * @opp_dev: opp-dev pointer for device
 * @opp_table: the device-opp being added
 *
 * Dynamically adds device specific directory in debugfs 'opp' directory. If the
 * device-opp is shared with other devices, then links will be created for all
 * devices except the first.
 */
void opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table)
{
	if (opp_table->dentry)
		opp_list_debug_create_link(opp_dev, opp_table);
	else
		opp_list_debug_create_dir(opp_dev, opp_table);
}

static void opp_migrate_dentry(struct opp_device *opp_dev,
			       struct opp_table *opp_table)
{
	struct opp_device *new_dev = NULL, *iter;
	const struct device *dev;
	struct dentry *dentry;

	/* Look for next opp-dev */
	list_for_each_entry(iter, &opp_table->dev_list, node)
		if (iter != opp_dev) {
			new_dev = iter;
			break;
		}

	BUG_ON(!new_dev);

	/* new_dev is guaranteed to be valid here */
	dev = new_dev->dev;
	debugfs_remove_recursive(new_dev->dentry);

	opp_set_dev_name(dev, opp_table->dentry_name);

	dentry = debugfs_rename(rootdir, opp_dev->dentry, rootdir,
				opp_table->dentry_name);
	if (!dentry) {
		dev_err(dev, "%s: Failed to rename link from: %s to %s\n",
			__func__, dev_name(opp_dev->dev), dev_name(dev));
		return;
	}

	new_dev->dentry = dentry;
	opp_table->dentry = dentry;
}

/**
 * opp_debug_unregister - remove a device opp node from debugfs opp directory
 * @opp_dev: opp-dev pointer for device
 * @opp_table: the device-opp being removed
 *
 * Dynamically removes device specific directory from debugfs 'opp' directory.
 */
void opp_debug_unregister(struct opp_device *opp_dev,
			  struct opp_table *opp_table)
{
	if (opp_dev->dentry == opp_table->dentry) {
		/* Move the real dentry object under another device */
		if (!list_is_singular(&opp_table->dev_list)) {
			opp_migrate_dentry(opp_dev, opp_table);
			goto out;
		}
		opp_table->dentry = NULL;
	}

	debugfs_remove_recursive(opp_dev->dentry);

out:
	opp_dev->dentry = NULL;
}

static int __init opp_debug_init(void)
{
	/* Create /sys/kernel/debug/opp directory */
	rootdir = debugfs_create_dir("opp", NULL);

	return 0;
}
core_initcall(opp_debug_init);