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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/drivers/cpufreq/freq_table.c
4 *
5 * Copyright (C) 2002 - 2003 Dominik Brodowski
6 */
7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/cpufreq.h>
11#include <linux/module.h>
12
13/*********************************************************************
14 * FREQUENCY TABLE HELPERS *
15 *********************************************************************/
16
17bool policy_has_boost_freq(struct cpufreq_policy *policy)
18{
19 struct cpufreq_frequency_table *pos, *table = policy->freq_table;
20
21 if (!table)
22 return false;
23
24 cpufreq_for_each_valid_entry(pos, table)
25 if (pos->flags & CPUFREQ_BOOST_FREQ)
26 return true;
27
28 return false;
29}
30EXPORT_SYMBOL_GPL(policy_has_boost_freq);
31
32int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
33 struct cpufreq_frequency_table *table)
34{
35 struct cpufreq_frequency_table *pos;
36 unsigned int min_freq = ~0;
37 unsigned int max_freq = 0;
38 unsigned int freq;
39
40 cpufreq_for_each_valid_entry(pos, table) {
41 freq = pos->frequency;
42
43 if (!cpufreq_boost_enabled()
44 && (pos->flags & CPUFREQ_BOOST_FREQ))
45 continue;
46
47 pr_debug("table entry %u: %u kHz\n", (int)(pos - table), freq);
48 if (freq < min_freq)
49 min_freq = freq;
50 if (freq > max_freq)
51 max_freq = freq;
52 }
53
54 policy->min = policy->cpuinfo.min_freq = min_freq;
55 policy->max = max_freq;
56 /*
57 * If the driver has set its own cpuinfo.max_freq above max_freq, leave
58 * it as is.
59 */
60 if (policy->cpuinfo.max_freq < max_freq)
61 policy->max = policy->cpuinfo.max_freq = max_freq;
62
63 if (policy->min == ~0)
64 return -EINVAL;
65 else
66 return 0;
67}
68
69int cpufreq_frequency_table_verify(struct cpufreq_policy_data *policy,
70 struct cpufreq_frequency_table *table)
71{
72 struct cpufreq_frequency_table *pos;
73 unsigned int freq, next_larger = ~0;
74 bool found = false;
75
76 pr_debug("request for verification of policy (%u - %u kHz) for cpu %u\n",
77 policy->min, policy->max, policy->cpu);
78
79 cpufreq_verify_within_cpu_limits(policy);
80
81 cpufreq_for_each_valid_entry(pos, table) {
82 freq = pos->frequency;
83
84 if ((freq >= policy->min) && (freq <= policy->max)) {
85 found = true;
86 break;
87 }
88
89 if ((next_larger > freq) && (freq > policy->max))
90 next_larger = freq;
91 }
92
93 if (!found) {
94 policy->max = next_larger;
95 cpufreq_verify_within_cpu_limits(policy);
96 }
97
98 pr_debug("verification lead to (%u - %u kHz) for cpu %u\n",
99 policy->min, policy->max, policy->cpu);
100
101 return 0;
102}
103EXPORT_SYMBOL_GPL(cpufreq_frequency_table_verify);
104
105/*
106 * Generic routine to verify policy & frequency table, requires driver to set
107 * policy->freq_table prior to it.
108 */
109int cpufreq_generic_frequency_table_verify(struct cpufreq_policy_data *policy)
110{
111 if (!policy->freq_table)
112 return -ENODEV;
113
114 return cpufreq_frequency_table_verify(policy, policy->freq_table);
115}
116EXPORT_SYMBOL_GPL(cpufreq_generic_frequency_table_verify);
117
118int cpufreq_table_index_unsorted(struct cpufreq_policy *policy,
119 unsigned int target_freq,
120 unsigned int relation)
121{
122 struct cpufreq_frequency_table optimal = {
123 .driver_data = ~0,
124 .frequency = 0,
125 };
126 struct cpufreq_frequency_table suboptimal = {
127 .driver_data = ~0,
128 .frequency = 0,
129 };
130 struct cpufreq_frequency_table *pos;
131 struct cpufreq_frequency_table *table = policy->freq_table;
132 unsigned int freq, diff, i = 0;
133 int index;
134
135 pr_debug("request for target %u kHz (relation: %u) for cpu %u\n",
136 target_freq, relation, policy->cpu);
137
138 switch (relation) {
139 case CPUFREQ_RELATION_H:
140 suboptimal.frequency = ~0;
141 break;
142 case CPUFREQ_RELATION_L:
143 case CPUFREQ_RELATION_C:
144 optimal.frequency = ~0;
145 break;
146 }
147
148 cpufreq_for_each_valid_entry_idx(pos, table, i) {
149 freq = pos->frequency;
150
151 if ((freq < policy->min) || (freq > policy->max))
152 continue;
153 if (freq == target_freq) {
154 optimal.driver_data = i;
155 break;
156 }
157 switch (relation) {
158 case CPUFREQ_RELATION_H:
159 if (freq < target_freq) {
160 if (freq >= optimal.frequency) {
161 optimal.frequency = freq;
162 optimal.driver_data = i;
163 }
164 } else {
165 if (freq <= suboptimal.frequency) {
166 suboptimal.frequency = freq;
167 suboptimal.driver_data = i;
168 }
169 }
170 break;
171 case CPUFREQ_RELATION_L:
172 if (freq > target_freq) {
173 if (freq <= optimal.frequency) {
174 optimal.frequency = freq;
175 optimal.driver_data = i;
176 }
177 } else {
178 if (freq >= suboptimal.frequency) {
179 suboptimal.frequency = freq;
180 suboptimal.driver_data = i;
181 }
182 }
183 break;
184 case CPUFREQ_RELATION_C:
185 diff = abs(freq - target_freq);
186 if (diff < optimal.frequency ||
187 (diff == optimal.frequency &&
188 freq > table[optimal.driver_data].frequency)) {
189 optimal.frequency = diff;
190 optimal.driver_data = i;
191 }
192 break;
193 }
194 }
195 if (optimal.driver_data > i) {
196 if (suboptimal.driver_data > i) {
197 WARN(1, "Invalid frequency table: %d\n", policy->cpu);
198 return 0;
199 }
200
201 index = suboptimal.driver_data;
202 } else
203 index = optimal.driver_data;
204
205 pr_debug("target index is %u, freq is:%u kHz\n", index,
206 table[index].frequency);
207 return index;
208}
209EXPORT_SYMBOL_GPL(cpufreq_table_index_unsorted);
210
211int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
212 unsigned int freq)
213{
214 struct cpufreq_frequency_table *pos, *table = policy->freq_table;
215 int idx;
216
217 if (unlikely(!table)) {
218 pr_debug("%s: Unable to find frequency table\n", __func__);
219 return -ENOENT;
220 }
221
222 cpufreq_for_each_valid_entry_idx(pos, table, idx)
223 if (pos->frequency == freq)
224 return idx;
225
226 return -EINVAL;
227}
228EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_index);
229
230/*
231 * show_available_freqs - show available frequencies for the specified CPU
232 */
233static ssize_t show_available_freqs(struct cpufreq_policy *policy, char *buf,
234 bool show_boost)
235{
236 ssize_t count = 0;
237 struct cpufreq_frequency_table *pos, *table = policy->freq_table;
238
239 if (!table)
240 return -ENODEV;
241
242 cpufreq_for_each_valid_entry(pos, table) {
243 /*
244 * show_boost = true and driver_data = BOOST freq
245 * display BOOST freqs
246 *
247 * show_boost = false and driver_data = BOOST freq
248 * show_boost = true and driver_data != BOOST freq
249 * continue - do not display anything
250 *
251 * show_boost = false and driver_data != BOOST freq
252 * display NON BOOST freqs
253 */
254 if (show_boost ^ (pos->flags & CPUFREQ_BOOST_FREQ))
255 continue;
256
257 count += sprintf(&buf[count], "%d ", pos->frequency);
258 }
259 count += sprintf(&buf[count], "\n");
260
261 return count;
262
263}
264
265#define cpufreq_attr_available_freq(_name) \
266struct freq_attr cpufreq_freq_attr_##_name##_freqs = \
267__ATTR_RO(_name##_frequencies)
268
269/*
270 * scaling_available_frequencies_show - show available normal frequencies for
271 * the specified CPU
272 */
273static ssize_t scaling_available_frequencies_show(struct cpufreq_policy *policy,
274 char *buf)
275{
276 return show_available_freqs(policy, buf, false);
277}
278cpufreq_attr_available_freq(scaling_available);
279EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs);
280
281/*
282 * scaling_boost_frequencies_show - show available boost frequencies for
283 * the specified CPU
284 */
285static ssize_t scaling_boost_frequencies_show(struct cpufreq_policy *policy,
286 char *buf)
287{
288 return show_available_freqs(policy, buf, true);
289}
290cpufreq_attr_available_freq(scaling_boost);
291EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_boost_freqs);
292
293struct freq_attr *cpufreq_generic_attr[] = {
294 &cpufreq_freq_attr_scaling_available_freqs,
295 NULL,
296};
297EXPORT_SYMBOL_GPL(cpufreq_generic_attr);
298
299static int set_freq_table_sorted(struct cpufreq_policy *policy)
300{
301 struct cpufreq_frequency_table *pos, *table = policy->freq_table;
302 struct cpufreq_frequency_table *prev = NULL;
303 int ascending = 0;
304
305 policy->freq_table_sorted = CPUFREQ_TABLE_UNSORTED;
306
307 cpufreq_for_each_valid_entry(pos, table) {
308 if (!prev) {
309 prev = pos;
310 continue;
311 }
312
313 if (pos->frequency == prev->frequency) {
314 pr_warn("Duplicate freq-table entries: %u\n",
315 pos->frequency);
316 return -EINVAL;
317 }
318
319 /* Frequency increased from prev to pos */
320 if (pos->frequency > prev->frequency) {
321 /* But frequency was decreasing earlier */
322 if (ascending < 0) {
323 pr_debug("Freq table is unsorted\n");
324 return 0;
325 }
326
327 ascending++;
328 } else {
329 /* Frequency decreased from prev to pos */
330
331 /* But frequency was increasing earlier */
332 if (ascending > 0) {
333 pr_debug("Freq table is unsorted\n");
334 return 0;
335 }
336
337 ascending--;
338 }
339
340 prev = pos;
341 }
342
343 if (ascending > 0)
344 policy->freq_table_sorted = CPUFREQ_TABLE_SORTED_ASCENDING;
345 else
346 policy->freq_table_sorted = CPUFREQ_TABLE_SORTED_DESCENDING;
347
348 pr_debug("Freq table is sorted in %s order\n",
349 ascending > 0 ? "ascending" : "descending");
350
351 return 0;
352}
353
354int cpufreq_table_validate_and_sort(struct cpufreq_policy *policy)
355{
356 int ret;
357
358 if (!policy->freq_table) {
359 /* Freq table must be passed by drivers with target_index() */
360 if (has_target_index())
361 return -EINVAL;
362
363 return 0;
364 }
365
366 ret = cpufreq_frequency_table_cpuinfo(policy, policy->freq_table);
367 if (ret)
368 return ret;
369
370 return set_freq_table_sorted(policy);
371}
372
373MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
374MODULE_DESCRIPTION("CPUfreq frequency table helpers");
1/*
2 * linux/drivers/cpufreq/freq_table.c
3 *
4 * Copyright (C) 2002 - 2003 Dominik Brodowski
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
12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14#include <linux/cpufreq.h>
15#include <linux/module.h>
16
17/*********************************************************************
18 * FREQUENCY TABLE HELPERS *
19 *********************************************************************/
20
21bool policy_has_boost_freq(struct cpufreq_policy *policy)
22{
23 struct cpufreq_frequency_table *pos, *table = policy->freq_table;
24
25 if (!table)
26 return false;
27
28 cpufreq_for_each_valid_entry(pos, table)
29 if (pos->flags & CPUFREQ_BOOST_FREQ)
30 return true;
31
32 return false;
33}
34EXPORT_SYMBOL_GPL(policy_has_boost_freq);
35
36int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
37 struct cpufreq_frequency_table *table)
38{
39 struct cpufreq_frequency_table *pos;
40 unsigned int min_freq = ~0;
41 unsigned int max_freq = 0;
42 unsigned int freq;
43
44 cpufreq_for_each_valid_entry(pos, table) {
45 freq = pos->frequency;
46
47 if (!cpufreq_boost_enabled()
48 && (pos->flags & CPUFREQ_BOOST_FREQ))
49 continue;
50
51 pr_debug("table entry %u: %u kHz\n", (int)(pos - table), freq);
52 if (freq < min_freq)
53 min_freq = freq;
54 if (freq > max_freq)
55 max_freq = freq;
56 }
57
58 policy->min = policy->cpuinfo.min_freq = min_freq;
59 policy->max = policy->cpuinfo.max_freq = max_freq;
60
61 if (policy->min == ~0)
62 return -EINVAL;
63 else
64 return 0;
65}
66
67int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
68 struct cpufreq_frequency_table *table)
69{
70 struct cpufreq_frequency_table *pos;
71 unsigned int freq, next_larger = ~0;
72 bool found = false;
73
74 pr_debug("request for verification of policy (%u - %u kHz) for cpu %u\n",
75 policy->min, policy->max, policy->cpu);
76
77 cpufreq_verify_within_cpu_limits(policy);
78
79 cpufreq_for_each_valid_entry(pos, table) {
80 freq = pos->frequency;
81
82 if ((freq >= policy->min) && (freq <= policy->max)) {
83 found = true;
84 break;
85 }
86
87 if ((next_larger > freq) && (freq > policy->max))
88 next_larger = freq;
89 }
90
91 if (!found) {
92 policy->max = next_larger;
93 cpufreq_verify_within_cpu_limits(policy);
94 }
95
96 pr_debug("verification lead to (%u - %u kHz) for cpu %u\n",
97 policy->min, policy->max, policy->cpu);
98
99 return 0;
100}
101EXPORT_SYMBOL_GPL(cpufreq_frequency_table_verify);
102
103/*
104 * Generic routine to verify policy & frequency table, requires driver to set
105 * policy->freq_table prior to it.
106 */
107int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy)
108{
109 if (!policy->freq_table)
110 return -ENODEV;
111
112 return cpufreq_frequency_table_verify(policy, policy->freq_table);
113}
114EXPORT_SYMBOL_GPL(cpufreq_generic_frequency_table_verify);
115
116int cpufreq_table_index_unsorted(struct cpufreq_policy *policy,
117 unsigned int target_freq,
118 unsigned int relation)
119{
120 struct cpufreq_frequency_table optimal = {
121 .driver_data = ~0,
122 .frequency = 0,
123 };
124 struct cpufreq_frequency_table suboptimal = {
125 .driver_data = ~0,
126 .frequency = 0,
127 };
128 struct cpufreq_frequency_table *pos;
129 struct cpufreq_frequency_table *table = policy->freq_table;
130 unsigned int freq, diff, i = 0;
131 int index;
132
133 pr_debug("request for target %u kHz (relation: %u) for cpu %u\n",
134 target_freq, relation, policy->cpu);
135
136 switch (relation) {
137 case CPUFREQ_RELATION_H:
138 suboptimal.frequency = ~0;
139 break;
140 case CPUFREQ_RELATION_L:
141 case CPUFREQ_RELATION_C:
142 optimal.frequency = ~0;
143 break;
144 }
145
146 cpufreq_for_each_valid_entry(pos, table) {
147 freq = pos->frequency;
148
149 i = pos - table;
150 if ((freq < policy->min) || (freq > policy->max))
151 continue;
152 if (freq == target_freq) {
153 optimal.driver_data = i;
154 break;
155 }
156 switch (relation) {
157 case CPUFREQ_RELATION_H:
158 if (freq < target_freq) {
159 if (freq >= optimal.frequency) {
160 optimal.frequency = freq;
161 optimal.driver_data = i;
162 }
163 } else {
164 if (freq <= suboptimal.frequency) {
165 suboptimal.frequency = freq;
166 suboptimal.driver_data = i;
167 }
168 }
169 break;
170 case CPUFREQ_RELATION_L:
171 if (freq > target_freq) {
172 if (freq <= optimal.frequency) {
173 optimal.frequency = freq;
174 optimal.driver_data = i;
175 }
176 } else {
177 if (freq >= suboptimal.frequency) {
178 suboptimal.frequency = freq;
179 suboptimal.driver_data = i;
180 }
181 }
182 break;
183 case CPUFREQ_RELATION_C:
184 diff = abs(freq - target_freq);
185 if (diff < optimal.frequency ||
186 (diff == optimal.frequency &&
187 freq > table[optimal.driver_data].frequency)) {
188 optimal.frequency = diff;
189 optimal.driver_data = i;
190 }
191 break;
192 }
193 }
194 if (optimal.driver_data > i) {
195 if (suboptimal.driver_data > i) {
196 WARN(1, "Invalid frequency table: %d\n", policy->cpu);
197 return 0;
198 }
199
200 index = suboptimal.driver_data;
201 } else
202 index = optimal.driver_data;
203
204 pr_debug("target index is %u, freq is:%u kHz\n", index,
205 table[index].frequency);
206 return index;
207}
208EXPORT_SYMBOL_GPL(cpufreq_table_index_unsorted);
209
210int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
211 unsigned int freq)
212{
213 struct cpufreq_frequency_table *pos, *table = policy->freq_table;
214
215 if (unlikely(!table)) {
216 pr_debug("%s: Unable to find frequency table\n", __func__);
217 return -ENOENT;
218 }
219
220 cpufreq_for_each_valid_entry(pos, table)
221 if (pos->frequency == freq)
222 return pos - table;
223
224 return -EINVAL;
225}
226EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_index);
227
228/**
229 * show_available_freqs - show available frequencies for the specified CPU
230 */
231static ssize_t show_available_freqs(struct cpufreq_policy *policy, char *buf,
232 bool show_boost)
233{
234 ssize_t count = 0;
235 struct cpufreq_frequency_table *pos, *table = policy->freq_table;
236
237 if (!table)
238 return -ENODEV;
239
240 cpufreq_for_each_valid_entry(pos, table) {
241 /*
242 * show_boost = true and driver_data = BOOST freq
243 * display BOOST freqs
244 *
245 * show_boost = false and driver_data = BOOST freq
246 * show_boost = true and driver_data != BOOST freq
247 * continue - do not display anything
248 *
249 * show_boost = false and driver_data != BOOST freq
250 * display NON BOOST freqs
251 */
252 if (show_boost ^ (pos->flags & CPUFREQ_BOOST_FREQ))
253 continue;
254
255 count += sprintf(&buf[count], "%d ", pos->frequency);
256 }
257 count += sprintf(&buf[count], "\n");
258
259 return count;
260
261}
262
263#define cpufreq_attr_available_freq(_name) \
264struct freq_attr cpufreq_freq_attr_##_name##_freqs = \
265__ATTR_RO(_name##_frequencies)
266
267/**
268 * show_scaling_available_frequencies - show available normal frequencies for
269 * the specified CPU
270 */
271static ssize_t scaling_available_frequencies_show(struct cpufreq_policy *policy,
272 char *buf)
273{
274 return show_available_freqs(policy, buf, false);
275}
276cpufreq_attr_available_freq(scaling_available);
277EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs);
278
279/**
280 * show_available_boost_freqs - show available boost frequencies for
281 * the specified CPU
282 */
283static ssize_t scaling_boost_frequencies_show(struct cpufreq_policy *policy,
284 char *buf)
285{
286 return show_available_freqs(policy, buf, true);
287}
288cpufreq_attr_available_freq(scaling_boost);
289EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_boost_freqs);
290
291struct freq_attr *cpufreq_generic_attr[] = {
292 &cpufreq_freq_attr_scaling_available_freqs,
293#ifdef CONFIG_CPU_FREQ_BOOST_SW
294 &cpufreq_freq_attr_scaling_boost_freqs,
295#endif
296 NULL,
297};
298EXPORT_SYMBOL_GPL(cpufreq_generic_attr);
299
300static int set_freq_table_sorted(struct cpufreq_policy *policy)
301{
302 struct cpufreq_frequency_table *pos, *table = policy->freq_table;
303 struct cpufreq_frequency_table *prev = NULL;
304 int ascending = 0;
305
306 policy->freq_table_sorted = CPUFREQ_TABLE_UNSORTED;
307
308 cpufreq_for_each_valid_entry(pos, table) {
309 if (!prev) {
310 prev = pos;
311 continue;
312 }
313
314 if (pos->frequency == prev->frequency) {
315 pr_warn("Duplicate freq-table entries: %u\n",
316 pos->frequency);
317 return -EINVAL;
318 }
319
320 /* Frequency increased from prev to pos */
321 if (pos->frequency > prev->frequency) {
322 /* But frequency was decreasing earlier */
323 if (ascending < 0) {
324 pr_debug("Freq table is unsorted\n");
325 return 0;
326 }
327
328 ascending++;
329 } else {
330 /* Frequency decreased from prev to pos */
331
332 /* But frequency was increasing earlier */
333 if (ascending > 0) {
334 pr_debug("Freq table is unsorted\n");
335 return 0;
336 }
337
338 ascending--;
339 }
340
341 prev = pos;
342 }
343
344 if (ascending > 0)
345 policy->freq_table_sorted = CPUFREQ_TABLE_SORTED_ASCENDING;
346 else
347 policy->freq_table_sorted = CPUFREQ_TABLE_SORTED_DESCENDING;
348
349 pr_debug("Freq table is sorted in %s order\n",
350 ascending > 0 ? "ascending" : "descending");
351
352 return 0;
353}
354
355int cpufreq_table_validate_and_show(struct cpufreq_policy *policy,
356 struct cpufreq_frequency_table *table)
357{
358 int ret;
359
360 ret = cpufreq_frequency_table_cpuinfo(policy, table);
361 if (ret)
362 return ret;
363
364 policy->freq_table = table;
365 return set_freq_table_sorted(policy);
366}
367EXPORT_SYMBOL_GPL(cpufreq_table_validate_and_show);
368
369MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
370MODULE_DESCRIPTION("CPUfreq frequency table helpers");
371MODULE_LICENSE("GPL");