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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
21int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
22 struct cpufreq_frequency_table *table)
23{
24 unsigned int min_freq = ~0;
25 unsigned int max_freq = 0;
26 unsigned int i;
27
28 for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
29 unsigned int freq = table[i].frequency;
30 if (freq == CPUFREQ_ENTRY_INVALID) {
31 pr_debug("table entry %u is invalid, skipping\n", i);
32
33 continue;
34 }
35 if (!cpufreq_boost_enabled()
36 && (table[i].flags & CPUFREQ_BOOST_FREQ))
37 continue;
38
39 pr_debug("table entry %u: %u kHz\n", i, freq);
40 if (freq < min_freq)
41 min_freq = freq;
42 if (freq > max_freq)
43 max_freq = freq;
44 }
45
46 policy->min = policy->cpuinfo.min_freq = min_freq;
47 policy->max = policy->cpuinfo.max_freq = max_freq;
48
49 if (policy->min == ~0)
50 return -EINVAL;
51 else
52 return 0;
53}
54EXPORT_SYMBOL_GPL(cpufreq_frequency_table_cpuinfo);
55
56
57int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
58 struct cpufreq_frequency_table *table)
59{
60 unsigned int next_larger = ~0, freq, i = 0;
61 bool found = false;
62
63 pr_debug("request for verification of policy (%u - %u kHz) for cpu %u\n",
64 policy->min, policy->max, policy->cpu);
65
66 cpufreq_verify_within_cpu_limits(policy);
67
68 for (; freq = table[i].frequency, freq != CPUFREQ_TABLE_END; i++) {
69 if (freq == CPUFREQ_ENTRY_INVALID)
70 continue;
71 if ((freq >= policy->min) && (freq <= policy->max)) {
72 found = true;
73 break;
74 }
75
76 if ((next_larger > freq) && (freq > policy->max))
77 next_larger = freq;
78 }
79
80 if (!found) {
81 policy->max = next_larger;
82 cpufreq_verify_within_cpu_limits(policy);
83 }
84
85 pr_debug("verification lead to (%u - %u kHz) for cpu %u\n",
86 policy->min, policy->max, policy->cpu);
87
88 return 0;
89}
90EXPORT_SYMBOL_GPL(cpufreq_frequency_table_verify);
91
92/*
93 * Generic routine to verify policy & frequency table, requires driver to set
94 * policy->freq_table prior to it.
95 */
96int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy)
97{
98 struct cpufreq_frequency_table *table =
99 cpufreq_frequency_get_table(policy->cpu);
100 if (!table)
101 return -ENODEV;
102
103 return cpufreq_frequency_table_verify(policy, table);
104}
105EXPORT_SYMBOL_GPL(cpufreq_generic_frequency_table_verify);
106
107int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
108 struct cpufreq_frequency_table *table,
109 unsigned int target_freq,
110 unsigned int relation,
111 unsigned int *index)
112{
113 struct cpufreq_frequency_table optimal = {
114 .driver_data = ~0,
115 .frequency = 0,
116 };
117 struct cpufreq_frequency_table suboptimal = {
118 .driver_data = ~0,
119 .frequency = 0,
120 };
121 unsigned int i;
122
123 pr_debug("request for target %u kHz (relation: %u) for cpu %u\n",
124 target_freq, relation, policy->cpu);
125
126 switch (relation) {
127 case CPUFREQ_RELATION_H:
128 suboptimal.frequency = ~0;
129 break;
130 case CPUFREQ_RELATION_L:
131 optimal.frequency = ~0;
132 break;
133 }
134
135 for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
136 unsigned int freq = table[i].frequency;
137 if (freq == CPUFREQ_ENTRY_INVALID)
138 continue;
139 if ((freq < policy->min) || (freq > policy->max))
140 continue;
141 switch (relation) {
142 case CPUFREQ_RELATION_H:
143 if (freq <= target_freq) {
144 if (freq >= optimal.frequency) {
145 optimal.frequency = freq;
146 optimal.driver_data = i;
147 }
148 } else {
149 if (freq <= suboptimal.frequency) {
150 suboptimal.frequency = freq;
151 suboptimal.driver_data = i;
152 }
153 }
154 break;
155 case CPUFREQ_RELATION_L:
156 if (freq >= target_freq) {
157 if (freq <= optimal.frequency) {
158 optimal.frequency = freq;
159 optimal.driver_data = i;
160 }
161 } else {
162 if (freq >= suboptimal.frequency) {
163 suboptimal.frequency = freq;
164 suboptimal.driver_data = i;
165 }
166 }
167 break;
168 }
169 }
170 if (optimal.driver_data > i) {
171 if (suboptimal.driver_data > i)
172 return -EINVAL;
173 *index = suboptimal.driver_data;
174 } else
175 *index = optimal.driver_data;
176
177 pr_debug("target index is %u, freq is:%u kHz\n", *index,
178 table[*index].frequency);
179
180 return 0;
181}
182EXPORT_SYMBOL_GPL(cpufreq_frequency_table_target);
183
184int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
185 unsigned int freq)
186{
187 struct cpufreq_frequency_table *table;
188 int i;
189
190 table = cpufreq_frequency_get_table(policy->cpu);
191 if (unlikely(!table)) {
192 pr_debug("%s: Unable to find frequency table\n", __func__);
193 return -ENOENT;
194 }
195
196 for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
197 if (table[i].frequency == freq)
198 return i;
199 }
200
201 return -EINVAL;
202}
203EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_index);
204
205/**
206 * show_available_freqs - show available frequencies for the specified CPU
207 */
208static ssize_t show_available_freqs(struct cpufreq_policy *policy, char *buf,
209 bool show_boost)
210{
211 unsigned int i = 0;
212 ssize_t count = 0;
213 struct cpufreq_frequency_table *table = policy->freq_table;
214
215 if (!table)
216 return -ENODEV;
217
218 for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
219 if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
220 continue;
221 /*
222 * show_boost = true and driver_data = BOOST freq
223 * display BOOST freqs
224 *
225 * show_boost = false and driver_data = BOOST freq
226 * show_boost = true and driver_data != BOOST freq
227 * continue - do not display anything
228 *
229 * show_boost = false and driver_data != BOOST freq
230 * display NON BOOST freqs
231 */
232 if (show_boost ^ (table[i].flags & CPUFREQ_BOOST_FREQ))
233 continue;
234
235 count += sprintf(&buf[count], "%d ", table[i].frequency);
236 }
237 count += sprintf(&buf[count], "\n");
238
239 return count;
240
241}
242
243#define cpufreq_attr_available_freq(_name) \
244struct freq_attr cpufreq_freq_attr_##_name##_freqs = \
245__ATTR_RO(_name##_frequencies)
246
247/**
248 * show_scaling_available_frequencies - show available normal frequencies for
249 * the specified CPU
250 */
251static ssize_t scaling_available_frequencies_show(struct cpufreq_policy *policy,
252 char *buf)
253{
254 return show_available_freqs(policy, buf, false);
255}
256cpufreq_attr_available_freq(scaling_available);
257EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs);
258
259/**
260 * show_available_boost_freqs - show available boost frequencies for
261 * the specified CPU
262 */
263static ssize_t scaling_boost_frequencies_show(struct cpufreq_policy *policy,
264 char *buf)
265{
266 return show_available_freqs(policy, buf, true);
267}
268cpufreq_attr_available_freq(scaling_boost);
269EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_boost_freqs);
270
271struct freq_attr *cpufreq_generic_attr[] = {
272 &cpufreq_freq_attr_scaling_available_freqs,
273#ifdef CONFIG_CPU_FREQ_BOOST_SW
274 &cpufreq_freq_attr_scaling_boost_freqs,
275#endif
276 NULL,
277};
278EXPORT_SYMBOL_GPL(cpufreq_generic_attr);
279
280int cpufreq_table_validate_and_show(struct cpufreq_policy *policy,
281 struct cpufreq_frequency_table *table)
282{
283 int ret = cpufreq_frequency_table_cpuinfo(policy, table);
284
285 if (!ret)
286 policy->freq_table = table;
287
288 return ret;
289}
290EXPORT_SYMBOL_GPL(cpufreq_table_validate_and_show);
291
292struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu);
293
294struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu)
295{
296 struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu);
297 return policy ? policy->freq_table : NULL;
298}
299EXPORT_SYMBOL_GPL(cpufreq_frequency_get_table);
300
301MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
302MODULE_DESCRIPTION("CPUfreq frequency table helpers");
303MODULE_LICENSE("GPL");