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12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14#include <linux/cpufreq.h>
15#include <linux/module.h>
16
17
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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
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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
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) {
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250
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
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269
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
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281
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
321 if (pos->frequency > prev->frequency) {
322
323 if (ascending < 0) {
324 pr_debug("Freq table is unsorted\n");
325 return 0;
326 }
327
328 ascending++;
329 } else {
330
331
332
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");
372
