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17#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18
19#include <linux/export.h>
20#include <linux/kernel_stat.h>
21#include <linux/slab.h>
22
23#include "cpufreq_governor.h"
24
25static struct attribute_group *get_sysfs_attr(struct dbs_data *dbs_data)
26{
27 if (have_governor_per_policy())
28 return dbs_data->cdata->attr_group_gov_pol;
29 else
30 return dbs_data->cdata->attr_group_gov_sys;
31}
32
33void dbs_check_cpu(struct dbs_data *dbs_data, int cpu)
34{
35 struct cpu_dbs_common_info *cdbs = dbs_data->cdata->get_cpu_cdbs(cpu);
36 struct od_dbs_tuners *od_tuners = dbs_data->tuners;
37 struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
38 struct cpufreq_policy *policy;
39 unsigned int max_load = 0;
40 unsigned int ignore_nice;
41 unsigned int j;
42
43 if (dbs_data->cdata->governor == GOV_ONDEMAND)
44 ignore_nice = od_tuners->ignore_nice_load;
45 else
46 ignore_nice = cs_tuners->ignore_nice_load;
47
48 policy = cdbs->cur_policy;
49
50
51 for_each_cpu(j, policy->cpus) {
52 struct cpu_dbs_common_info *j_cdbs;
53 u64 cur_wall_time, cur_idle_time;
54 unsigned int idle_time, wall_time;
55 unsigned int load;
56 int io_busy = 0;
57
58 j_cdbs = dbs_data->cdata->get_cpu_cdbs(j);
59
60
61
62
63
64
65
66 if (dbs_data->cdata->governor == GOV_ONDEMAND)
67 io_busy = od_tuners->io_is_busy;
68 cur_idle_time = get_cpu_idle_time(j, &cur_wall_time, io_busy);
69
70 wall_time = (unsigned int)
71 (cur_wall_time - j_cdbs->prev_cpu_wall);
72 j_cdbs->prev_cpu_wall = cur_wall_time;
73
74 idle_time = (unsigned int)
75 (cur_idle_time - j_cdbs->prev_cpu_idle);
76 j_cdbs->prev_cpu_idle = cur_idle_time;
77
78 if (ignore_nice) {
79 u64 cur_nice;
80 unsigned long cur_nice_jiffies;
81
82 cur_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE] -
83 cdbs->prev_cpu_nice;
84
85
86
87
88 cur_nice_jiffies = (unsigned long)
89 cputime64_to_jiffies64(cur_nice);
90
91 cdbs->prev_cpu_nice =
92 kcpustat_cpu(j).cpustat[CPUTIME_NICE];
93 idle_time += jiffies_to_usecs(cur_nice_jiffies);
94 }
95
96 if (unlikely(!wall_time || wall_time < idle_time))
97 continue;
98
99 load = 100 * (wall_time - idle_time) / wall_time;
100
101 if (load > max_load)
102 max_load = load;
103 }
104
105 dbs_data->cdata->gov_check_cpu(cpu, max_load);
106}
107EXPORT_SYMBOL_GPL(dbs_check_cpu);
108
109static inline void __gov_queue_work(int cpu, struct dbs_data *dbs_data,
110 unsigned int delay)
111{
112 struct cpu_dbs_common_info *cdbs = dbs_data->cdata->get_cpu_cdbs(cpu);
113
114 mod_delayed_work_on(cpu, system_wq, &cdbs->work, delay);
115}
116
117void gov_queue_work(struct dbs_data *dbs_data, struct cpufreq_policy *policy,
118 unsigned int delay, bool all_cpus)
119{
120 int i;
121
122 mutex_lock(&cpufreq_governor_lock);
123 if (!policy->governor_enabled)
124 goto out_unlock;
125
126 if (!all_cpus) {
127
128
129
130
131
132
133
134 __gov_queue_work(raw_smp_processor_id(), dbs_data, delay);
135 } else {
136 for_each_cpu(i, policy->cpus)
137 __gov_queue_work(i, dbs_data, delay);
138 }
139
140out_unlock:
141 mutex_unlock(&cpufreq_governor_lock);
142}
143EXPORT_SYMBOL_GPL(gov_queue_work);
144
145static inline void gov_cancel_work(struct dbs_data *dbs_data,
146 struct cpufreq_policy *policy)
147{
148 struct cpu_dbs_common_info *cdbs;
149 int i;
150
151 for_each_cpu(i, policy->cpus) {
152 cdbs = dbs_data->cdata->get_cpu_cdbs(i);
153 cancel_delayed_work_sync(&cdbs->work);
154 }
155}
156
157
158bool need_load_eval(struct cpu_dbs_common_info *cdbs,
159 unsigned int sampling_rate)
160{
161 if (policy_is_shared(cdbs->cur_policy)) {
162 ktime_t time_now = ktime_get();
163 s64 delta_us = ktime_us_delta(time_now, cdbs->time_stamp);
164
165
166 if (delta_us < (s64)(sampling_rate / 2))
167 return false;
168 else
169 cdbs->time_stamp = time_now;
170 }
171
172 return true;
173}
174EXPORT_SYMBOL_GPL(need_load_eval);
175
176static void set_sampling_rate(struct dbs_data *dbs_data,
177 unsigned int sampling_rate)
178{
179 if (dbs_data->cdata->governor == GOV_CONSERVATIVE) {
180 struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
181 cs_tuners->sampling_rate = sampling_rate;
182 } else {
183 struct od_dbs_tuners *od_tuners = dbs_data->tuners;
184 od_tuners->sampling_rate = sampling_rate;
185 }
186}
187
188int cpufreq_governor_dbs(struct cpufreq_policy *policy,
189 struct common_dbs_data *cdata, unsigned int event)
190{
191 struct dbs_data *dbs_data;
192 struct od_cpu_dbs_info_s *od_dbs_info = NULL;
193 struct cs_cpu_dbs_info_s *cs_dbs_info = NULL;
194 struct od_ops *od_ops = NULL;
195 struct od_dbs_tuners *od_tuners = NULL;
196 struct cs_dbs_tuners *cs_tuners = NULL;
197 struct cpu_dbs_common_info *cpu_cdbs;
198 unsigned int sampling_rate, latency, ignore_nice, j, cpu = policy->cpu;
199 int io_busy = 0;
200 int rc;
201
202 if (have_governor_per_policy())
203 dbs_data = policy->governor_data;
204 else
205 dbs_data = cdata->gdbs_data;
206
207 WARN_ON(!dbs_data && (event != CPUFREQ_GOV_POLICY_INIT));
208
209 switch (event) {
210 case CPUFREQ_GOV_POLICY_INIT:
211 if (have_governor_per_policy()) {
212 WARN_ON(dbs_data);
213 } else if (dbs_data) {
214 dbs_data->usage_count++;
215 policy->governor_data = dbs_data;
216 return 0;
217 }
218
219 dbs_data = kzalloc(sizeof(*dbs_data), GFP_KERNEL);
220 if (!dbs_data) {
221 pr_err("%s: POLICY_INIT: kzalloc failed\n", __func__);
222 return -ENOMEM;
223 }
224
225 dbs_data->cdata = cdata;
226 dbs_data->usage_count = 1;
227 rc = cdata->init(dbs_data);
228 if (rc) {
229 pr_err("%s: POLICY_INIT: init() failed\n", __func__);
230 kfree(dbs_data);
231 return rc;
232 }
233
234 if (!have_governor_per_policy())
235 WARN_ON(cpufreq_get_global_kobject());
236
237 rc = sysfs_create_group(get_governor_parent_kobj(policy),
238 get_sysfs_attr(dbs_data));
239 if (rc) {
240 cdata->exit(dbs_data);
241 kfree(dbs_data);
242 return rc;
243 }
244
245 policy->governor_data = dbs_data;
246
247
248 latency = policy->cpuinfo.transition_latency / 1000;
249 if (latency == 0)
250 latency = 1;
251
252
253 dbs_data->min_sampling_rate = max(dbs_data->min_sampling_rate,
254 MIN_LATENCY_MULTIPLIER * latency);
255 set_sampling_rate(dbs_data, max(dbs_data->min_sampling_rate,
256 latency * LATENCY_MULTIPLIER));
257
258 if ((cdata->governor == GOV_CONSERVATIVE) &&
259 (!policy->governor->initialized)) {
260 struct cs_ops *cs_ops = dbs_data->cdata->gov_ops;
261
262 cpufreq_register_notifier(cs_ops->notifier_block,
263 CPUFREQ_TRANSITION_NOTIFIER);
264 }
265
266 if (!have_governor_per_policy())
267 cdata->gdbs_data = dbs_data;
268
269 return 0;
270 case CPUFREQ_GOV_POLICY_EXIT:
271 if (!--dbs_data->usage_count) {
272 sysfs_remove_group(get_governor_parent_kobj(policy),
273 get_sysfs_attr(dbs_data));
274
275 if (!have_governor_per_policy())
276 cpufreq_put_global_kobject();
277
278 if ((dbs_data->cdata->governor == GOV_CONSERVATIVE) &&
279 (policy->governor->initialized == 1)) {
280 struct cs_ops *cs_ops = dbs_data->cdata->gov_ops;
281
282 cpufreq_unregister_notifier(cs_ops->notifier_block,
283 CPUFREQ_TRANSITION_NOTIFIER);
284 }
285
286 cdata->exit(dbs_data);
287 kfree(dbs_data);
288 cdata->gdbs_data = NULL;
289 }
290
291 policy->governor_data = NULL;
292 return 0;
293 }
294
295 cpu_cdbs = dbs_data->cdata->get_cpu_cdbs(cpu);
296
297 if (dbs_data->cdata->governor == GOV_CONSERVATIVE) {
298 cs_tuners = dbs_data->tuners;
299 cs_dbs_info = dbs_data->cdata->get_cpu_dbs_info_s(cpu);
300 sampling_rate = cs_tuners->sampling_rate;
301 ignore_nice = cs_tuners->ignore_nice_load;
302 } else {
303 od_tuners = dbs_data->tuners;
304 od_dbs_info = dbs_data->cdata->get_cpu_dbs_info_s(cpu);
305 sampling_rate = od_tuners->sampling_rate;
306 ignore_nice = od_tuners->ignore_nice_load;
307 od_ops = dbs_data->cdata->gov_ops;
308 io_busy = od_tuners->io_is_busy;
309 }
310
311 switch (event) {
312 case CPUFREQ_GOV_START:
313 if (!policy->cur)
314 return -EINVAL;
315
316 mutex_lock(&dbs_data->mutex);
317
318 for_each_cpu(j, policy->cpus) {
319 struct cpu_dbs_common_info *j_cdbs =
320 dbs_data->cdata->get_cpu_cdbs(j);
321
322 j_cdbs->cpu = j;
323 j_cdbs->cur_policy = policy;
324 j_cdbs->prev_cpu_idle = get_cpu_idle_time(j,
325 &j_cdbs->prev_cpu_wall, io_busy);
326 if (ignore_nice)
327 j_cdbs->prev_cpu_nice =
328 kcpustat_cpu(j).cpustat[CPUTIME_NICE];
329
330 mutex_init(&j_cdbs->timer_mutex);
331 INIT_DEFERRABLE_WORK(&j_cdbs->work,
332 dbs_data->cdata->gov_dbs_timer);
333 }
334
335 if (dbs_data->cdata->governor == GOV_CONSERVATIVE) {
336 cs_dbs_info->down_skip = 0;
337 cs_dbs_info->enable = 1;
338 cs_dbs_info->requested_freq = policy->cur;
339 } else {
340 od_dbs_info->rate_mult = 1;
341 od_dbs_info->sample_type = OD_NORMAL_SAMPLE;
342 od_ops->powersave_bias_init_cpu(cpu);
343 }
344
345 mutex_unlock(&dbs_data->mutex);
346
347
348 cpu_cdbs->time_stamp = ktime_get();
349
350 gov_queue_work(dbs_data, policy,
351 delay_for_sampling_rate(sampling_rate), true);
352 break;
353
354 case CPUFREQ_GOV_STOP:
355 if (dbs_data->cdata->governor == GOV_CONSERVATIVE)
356 cs_dbs_info->enable = 0;
357
358 gov_cancel_work(dbs_data, policy);
359
360 mutex_lock(&dbs_data->mutex);
361 mutex_destroy(&cpu_cdbs->timer_mutex);
362 cpu_cdbs->cur_policy = NULL;
363
364 mutex_unlock(&dbs_data->mutex);
365
366 break;
367
368 case CPUFREQ_GOV_LIMITS:
369 mutex_lock(&cpu_cdbs->timer_mutex);
370 if (policy->max < cpu_cdbs->cur_policy->cur)
371 __cpufreq_driver_target(cpu_cdbs->cur_policy,
372 policy->max, CPUFREQ_RELATION_H);
373 else if (policy->min > cpu_cdbs->cur_policy->cur)
374 __cpufreq_driver_target(cpu_cdbs->cur_policy,
375 policy->min, CPUFREQ_RELATION_L);
376 dbs_check_cpu(dbs_data, cpu);
377 mutex_unlock(&cpu_cdbs->timer_mutex);
378 break;
379 }
380 return 0;
381}
382EXPORT_SYMBOL_GPL(cpufreq_governor_dbs);
383