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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#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/cpufreq.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 pr_debug("table entry %u: %u kHz, %u index\n",
36 i, freq, table[i].index);
37 if (freq < min_freq)
38 min_freq = freq;
39 if (freq > max_freq)
40 max_freq = freq;
41 }
42
43 policy->min = policy->cpuinfo.min_freq = min_freq;
44 policy->max = policy->cpuinfo.max_freq = max_freq;
45
46 if (policy->min == ~0)
47 return -EINVAL;
48 else
49 return 0;
50}
51EXPORT_SYMBOL_GPL(cpufreq_frequency_table_cpuinfo);
52
53
54int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
55 struct cpufreq_frequency_table *table)
56{
57 unsigned int next_larger = ~0;
58 unsigned int i;
59 unsigned int count = 0;
60
61 pr_debug("request for verification of policy (%u - %u kHz) for cpu %u\n",
62 policy->min, policy->max, policy->cpu);
63
64 if (!cpu_online(policy->cpu))
65 return -EINVAL;
66
67 cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
68 policy->cpuinfo.max_freq);
69
70 for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
71 unsigned int freq = table[i].frequency;
72 if (freq == CPUFREQ_ENTRY_INVALID)
73 continue;
74 if ((freq >= policy->min) && (freq <= policy->max))
75 count++;
76 else if ((next_larger > freq) && (freq > policy->max))
77 next_larger = freq;
78 }
79
80 if (!count)
81 policy->max = next_larger;
82
83 cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
84 policy->cpuinfo.max_freq);
85
86 pr_debug("verification lead to (%u - %u kHz) for cpu %u\n",
87 policy->min, policy->max, policy->cpu);
88
89 return 0;
90}
91EXPORT_SYMBOL_GPL(cpufreq_frequency_table_verify);
92
93
94int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
95 struct cpufreq_frequency_table *table,
96 unsigned int target_freq,
97 unsigned int relation,
98 unsigned int *index)
99{
100 struct cpufreq_frequency_table optimal = {
101 .index = ~0,
102 .frequency = 0,
103 };
104 struct cpufreq_frequency_table suboptimal = {
105 .index = ~0,
106 .frequency = 0,
107 };
108 unsigned int i;
109
110 pr_debug("request for target %u kHz (relation: %u) for cpu %u\n",
111 target_freq, relation, policy->cpu);
112
113 switch (relation) {
114 case CPUFREQ_RELATION_H:
115 suboptimal.frequency = ~0;
116 break;
117 case CPUFREQ_RELATION_L:
118 optimal.frequency = ~0;
119 break;
120 }
121
122 if (!cpu_online(policy->cpu))
123 return -EINVAL;
124
125 for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
126 unsigned int freq = table[i].frequency;
127 if (freq == CPUFREQ_ENTRY_INVALID)
128 continue;
129 if ((freq < policy->min) || (freq > policy->max))
130 continue;
131 switch (relation) {
132 case CPUFREQ_RELATION_H:
133 if (freq <= target_freq) {
134 if (freq >= optimal.frequency) {
135 optimal.frequency = freq;
136 optimal.index = i;
137 }
138 } else {
139 if (freq <= suboptimal.frequency) {
140 suboptimal.frequency = freq;
141 suboptimal.index = i;
142 }
143 }
144 break;
145 case CPUFREQ_RELATION_L:
146 if (freq >= target_freq) {
147 if (freq <= optimal.frequency) {
148 optimal.frequency = freq;
149 optimal.index = i;
150 }
151 } else {
152 if (freq >= suboptimal.frequency) {
153 suboptimal.frequency = freq;
154 suboptimal.index = i;
155 }
156 }
157 break;
158 }
159 }
160 if (optimal.index > i) {
161 if (suboptimal.index > i)
162 return -EINVAL;
163 *index = suboptimal.index;
164 } else
165 *index = optimal.index;
166
167 pr_debug("target is %u (%u kHz, %u)\n", *index, table[*index].frequency,
168 table[*index].index);
169
170 return 0;
171}
172EXPORT_SYMBOL_GPL(cpufreq_frequency_table_target);
173
174static DEFINE_PER_CPU(struct cpufreq_frequency_table *, cpufreq_show_table);
175/**
176 * show_available_freqs - show available frequencies for the specified CPU
177 */
178static ssize_t show_available_freqs(struct cpufreq_policy *policy, char *buf)
179{
180 unsigned int i = 0;
181 unsigned int cpu = policy->cpu;
182 ssize_t count = 0;
183 struct cpufreq_frequency_table *table;
184
185 if (!per_cpu(cpufreq_show_table, cpu))
186 return -ENODEV;
187
188 table = per_cpu(cpufreq_show_table, cpu);
189
190 for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
191 if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
192 continue;
193 count += sprintf(&buf[count], "%d ", table[i].frequency);
194 }
195 count += sprintf(&buf[count], "\n");
196
197 return count;
198
199}
200
201struct freq_attr cpufreq_freq_attr_scaling_available_freqs = {
202 .attr = { .name = "scaling_available_frequencies",
203 .mode = 0444,
204 },
205 .show = show_available_freqs,
206};
207EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs);
208
209/*
210 * if you use these, you must assure that the frequency table is valid
211 * all the time between get_attr and put_attr!
212 */
213void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
214 unsigned int cpu)
215{
216 pr_debug("setting show_table for cpu %u to %p\n", cpu, table);
217 per_cpu(cpufreq_show_table, cpu) = table;
218}
219EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_attr);
220
221void cpufreq_frequency_table_put_attr(unsigned int cpu)
222{
223 pr_debug("clearing show_table for cpu %u\n", cpu);
224 per_cpu(cpufreq_show_table, cpu) = NULL;
225}
226EXPORT_SYMBOL_GPL(cpufreq_frequency_table_put_attr);
227
228struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu)
229{
230 return per_cpu(cpufreq_show_table, cpu);
231}
232EXPORT_SYMBOL_GPL(cpufreq_frequency_get_table);
233
234MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
235MODULE_DESCRIPTION("CPUfreq frequency table helpers");
236MODULE_LICENSE("GPL");
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}
66EXPORT_SYMBOL_GPL(cpufreq_frequency_table_cpuinfo);
67
68
69int cpufreq_frequency_table_verify(struct cpufreq_policy *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 *policy)
110{
111 struct cpufreq_frequency_table *table =
112 cpufreq_frequency_get_table(policy->cpu);
113 if (!table)
114 return -ENODEV;
115
116 return cpufreq_frequency_table_verify(policy, table);
117}
118EXPORT_SYMBOL_GPL(cpufreq_generic_frequency_table_verify);
119
120int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
121 struct cpufreq_frequency_table *table,
122 unsigned int target_freq,
123 unsigned int relation,
124 unsigned int *index)
125{
126 struct cpufreq_frequency_table optimal = {
127 .driver_data = ~0,
128 .frequency = 0,
129 };
130 struct cpufreq_frequency_table suboptimal = {
131 .driver_data = ~0,
132 .frequency = 0,
133 };
134 struct cpufreq_frequency_table *pos;
135 unsigned int freq, diff, i = 0;
136
137 pr_debug("request for target %u kHz (relation: %u) for cpu %u\n",
138 target_freq, relation, policy->cpu);
139
140 switch (relation) {
141 case CPUFREQ_RELATION_H:
142 suboptimal.frequency = ~0;
143 break;
144 case CPUFREQ_RELATION_L:
145 case CPUFREQ_RELATION_C:
146 optimal.frequency = ~0;
147 break;
148 }
149
150 cpufreq_for_each_valid_entry(pos, table) {
151 freq = pos->frequency;
152
153 i = pos - table;
154 if ((freq < policy->min) || (freq > policy->max))
155 continue;
156 if (freq == target_freq) {
157 optimal.driver_data = i;
158 break;
159 }
160 switch (relation) {
161 case CPUFREQ_RELATION_H:
162 if (freq < target_freq) {
163 if (freq >= optimal.frequency) {
164 optimal.frequency = freq;
165 optimal.driver_data = i;
166 }
167 } else {
168 if (freq <= suboptimal.frequency) {
169 suboptimal.frequency = freq;
170 suboptimal.driver_data = i;
171 }
172 }
173 break;
174 case CPUFREQ_RELATION_L:
175 if (freq > target_freq) {
176 if (freq <= optimal.frequency) {
177 optimal.frequency = freq;
178 optimal.driver_data = i;
179 }
180 } else {
181 if (freq >= suboptimal.frequency) {
182 suboptimal.frequency = freq;
183 suboptimal.driver_data = i;
184 }
185 }
186 break;
187 case CPUFREQ_RELATION_C:
188 diff = abs(freq - target_freq);
189 if (diff < optimal.frequency ||
190 (diff == optimal.frequency &&
191 freq > table[optimal.driver_data].frequency)) {
192 optimal.frequency = diff;
193 optimal.driver_data = i;
194 }
195 break;
196 }
197 }
198 if (optimal.driver_data > i) {
199 if (suboptimal.driver_data > i)
200 return -EINVAL;
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
208 return 0;
209}
210EXPORT_SYMBOL_GPL(cpufreq_frequency_table_target);
211
212int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
213 unsigned int freq)
214{
215 struct cpufreq_frequency_table *pos, *table;
216
217 table = cpufreq_frequency_get_table(policy->cpu);
218 if (unlikely(!table)) {
219 pr_debug("%s: Unable to find frequency table\n", __func__);
220 return -ENOENT;
221 }
222
223 cpufreq_for_each_valid_entry(pos, table)
224 if (pos->frequency == freq)
225 return pos - table;
226
227 return -EINVAL;
228}
229EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_index);
230
231/**
232 * show_available_freqs - show available frequencies for the specified CPU
233 */
234static ssize_t show_available_freqs(struct cpufreq_policy *policy, char *buf,
235 bool show_boost)
236{
237 ssize_t count = 0;
238 struct cpufreq_frequency_table *pos, *table = policy->freq_table;
239
240 if (!table)
241 return -ENODEV;
242
243 cpufreq_for_each_valid_entry(pos, table) {
244 /*
245 * show_boost = true and driver_data = BOOST freq
246 * display BOOST freqs
247 *
248 * show_boost = false and driver_data = BOOST freq
249 * show_boost = true and driver_data != BOOST freq
250 * continue - do not display anything
251 *
252 * show_boost = false and driver_data != BOOST freq
253 * display NON BOOST freqs
254 */
255 if (show_boost ^ (pos->flags & CPUFREQ_BOOST_FREQ))
256 continue;
257
258 count += sprintf(&buf[count], "%d ", pos->frequency);
259 }
260 count += sprintf(&buf[count], "\n");
261
262 return count;
263
264}
265
266#define cpufreq_attr_available_freq(_name) \
267struct freq_attr cpufreq_freq_attr_##_name##_freqs = \
268__ATTR_RO(_name##_frequencies)
269
270/**
271 * show_scaling_available_frequencies - show available normal frequencies for
272 * the specified CPU
273 */
274static ssize_t scaling_available_frequencies_show(struct cpufreq_policy *policy,
275 char *buf)
276{
277 return show_available_freqs(policy, buf, false);
278}
279cpufreq_attr_available_freq(scaling_available);
280EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs);
281
282/**
283 * show_available_boost_freqs - show available boost frequencies for
284 * the specified CPU
285 */
286static ssize_t scaling_boost_frequencies_show(struct cpufreq_policy *policy,
287 char *buf)
288{
289 return show_available_freqs(policy, buf, true);
290}
291cpufreq_attr_available_freq(scaling_boost);
292EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_boost_freqs);
293
294struct freq_attr *cpufreq_generic_attr[] = {
295 &cpufreq_freq_attr_scaling_available_freqs,
296#ifdef CONFIG_CPU_FREQ_BOOST_SW
297 &cpufreq_freq_attr_scaling_boost_freqs,
298#endif
299 NULL,
300};
301EXPORT_SYMBOL_GPL(cpufreq_generic_attr);
302
303int cpufreq_table_validate_and_show(struct cpufreq_policy *policy,
304 struct cpufreq_frequency_table *table)
305{
306 int ret = cpufreq_frequency_table_cpuinfo(policy, table);
307
308 if (!ret)
309 policy->freq_table = table;
310
311 return ret;
312}
313EXPORT_SYMBOL_GPL(cpufreq_table_validate_and_show);
314
315MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
316MODULE_DESCRIPTION("CPUfreq frequency table helpers");
317MODULE_LICENSE("GPL");