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1 | /* |
2 | * drivers/cpufreq/cpufreq_governor.h | |
3 | * | |
4 | * Header file for CPUFreq governors common code | |
5 | * | |
6 | * Copyright (C) 2001 Russell King | |
7 | * (C) 2003 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>. | |
8 | * (C) 2003 Jun Nakajima <jun.nakajima@intel.com> | |
9 | * (C) 2009 Alexander Clouter <alex@digriz.org.uk> | |
10 | * (c) 2012 Viresh Kumar <viresh.kumar@linaro.org> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License version 2 as | |
14 | * published by the Free Software Foundation. | |
15 | */ | |
16 | ||
beb0ff39 BP |
17 | #ifndef _CPUFREQ_GOVERNOR_H |
18 | #define _CPUFREQ_GOVERNOR_H | |
4471a34f | 19 | |
4471a34f | 20 | #include <linux/cpufreq.h> |
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21 | #include <linux/kernel_stat.h> |
22 | #include <linux/module.h> | |
4471a34f | 23 | #include <linux/mutex.h> |
4471a34f VK |
24 | |
25 | /* | |
26 | * The polling frequency depends on the capability of the processor. Default | |
27 | * polling frequency is 1000 times the transition latency of the processor. The | |
28 | * governor will work on any processor with transition latency <= 10mS, using | |
29 | * appropriate sampling rate. | |
30 | * | |
31 | * For CPUs with transition latency > 10mS (mostly drivers with CPUFREQ_ETERNAL) | |
32 | * this governor will not work. All times here are in uS. | |
33 | */ | |
34 | #define MIN_SAMPLING_RATE_RATIO (2) | |
35 | #define LATENCY_MULTIPLIER (1000) | |
98104ee2 | 36 | #define MIN_LATENCY_MULTIPLIER (20) |
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37 | #define TRANSITION_LATENCY_LIMIT (10 * 1000 * 1000) |
38 | ||
39 | /* Ondemand Sampling types */ | |
40 | enum {OD_NORMAL_SAMPLE, OD_SUB_SAMPLE}; | |
41 | ||
4d5dcc42 VK |
42 | /* |
43 | * Macro for creating governors sysfs routines | |
44 | * | |
45 | * - gov_sys: One governor instance per whole system | |
46 | * - gov_pol: One governor instance per policy | |
47 | */ | |
48 | ||
49 | /* Create attributes */ | |
50 | #define gov_sys_attr_ro(_name) \ | |
51 | static struct global_attr _name##_gov_sys = \ | |
52 | __ATTR(_name, 0444, show_##_name##_gov_sys, NULL) | |
53 | ||
54 | #define gov_sys_attr_rw(_name) \ | |
55 | static struct global_attr _name##_gov_sys = \ | |
56 | __ATTR(_name, 0644, show_##_name##_gov_sys, store_##_name##_gov_sys) | |
57 | ||
58 | #define gov_pol_attr_ro(_name) \ | |
59 | static struct freq_attr _name##_gov_pol = \ | |
60 | __ATTR(_name, 0444, show_##_name##_gov_pol, NULL) | |
61 | ||
62 | #define gov_pol_attr_rw(_name) \ | |
63 | static struct freq_attr _name##_gov_pol = \ | |
64 | __ATTR(_name, 0644, show_##_name##_gov_pol, store_##_name##_gov_pol) | |
65 | ||
66 | #define gov_sys_pol_attr_rw(_name) \ | |
67 | gov_sys_attr_rw(_name); \ | |
68 | gov_pol_attr_rw(_name) | |
69 | ||
70 | #define gov_sys_pol_attr_ro(_name) \ | |
71 | gov_sys_attr_ro(_name); \ | |
72 | gov_pol_attr_ro(_name) | |
73 | ||
74 | /* Create show/store routines */ | |
75 | #define show_one(_gov, file_name) \ | |
76 | static ssize_t show_##file_name##_gov_sys \ | |
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77 | (struct kobject *kobj, struct attribute *attr, char *buf) \ |
78 | { \ | |
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79 | struct _gov##_dbs_tuners *tuners = _gov##_dbs_cdata.gdbs_data->tuners; \ |
80 | return sprintf(buf, "%u\n", tuners->file_name); \ | |
81 | } \ | |
82 | \ | |
bb176f7d | 83 | static ssize_t show_##file_name##_gov_pol \ |
4d5dcc42 VK |
84 | (struct cpufreq_policy *policy, char *buf) \ |
85 | { \ | |
86 | struct dbs_data *dbs_data = policy->governor_data; \ | |
87 | struct _gov##_dbs_tuners *tuners = dbs_data->tuners; \ | |
88 | return sprintf(buf, "%u\n", tuners->file_name); \ | |
89 | } | |
90 | ||
91 | #define store_one(_gov, file_name) \ | |
92 | static ssize_t store_##file_name##_gov_sys \ | |
bb176f7d | 93 | (struct kobject *kobj, struct attribute *attr, const char *buf, size_t count) \ |
4d5dcc42 VK |
94 | { \ |
95 | struct dbs_data *dbs_data = _gov##_dbs_cdata.gdbs_data; \ | |
96 | return store_##file_name(dbs_data, buf, count); \ | |
97 | } \ | |
98 | \ | |
99 | static ssize_t store_##file_name##_gov_pol \ | |
100 | (struct cpufreq_policy *policy, const char *buf, size_t count) \ | |
101 | { \ | |
102 | struct dbs_data *dbs_data = policy->governor_data; \ | |
103 | return store_##file_name(dbs_data, buf, count); \ | |
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104 | } |
105 | ||
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106 | #define show_store_one(_gov, file_name) \ |
107 | show_one(_gov, file_name); \ | |
108 | store_one(_gov, file_name) | |
109 | ||
110 | /* create helper routines */ | |
4471a34f VK |
111 | #define define_get_cpu_dbs_routines(_dbs_info) \ |
112 | static struct cpu_dbs_common_info *get_cpu_cdbs(int cpu) \ | |
113 | { \ | |
114 | return &per_cpu(_dbs_info, cpu).cdbs; \ | |
115 | } \ | |
116 | \ | |
117 | static void *get_cpu_dbs_info_s(int cpu) \ | |
118 | { \ | |
119 | return &per_cpu(_dbs_info, cpu); \ | |
120 | } | |
121 | ||
122 | /* | |
123 | * Abbreviations: | |
124 | * dbs: used as a shortform for demand based switching It helps to keep variable | |
125 | * names smaller, simpler | |
126 | * cdbs: common dbs | |
e5dde92c | 127 | * od_*: On-demand governor |
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128 | * cs_*: Conservative governor |
129 | */ | |
130 | ||
131 | /* Per cpu structures */ | |
132 | struct cpu_dbs_common_info { | |
133 | int cpu; | |
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134 | u64 prev_cpu_idle; |
135 | u64 prev_cpu_wall; | |
136 | u64 prev_cpu_nice; | |
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137 | struct cpufreq_policy *cur_policy; |
138 | struct delayed_work work; | |
139 | /* | |
140 | * percpu mutex that serializes governor limit change with gov_dbs_timer | |
141 | * invocation. We do not want gov_dbs_timer to run when user is changing | |
142 | * the governor or limits. | |
143 | */ | |
144 | struct mutex timer_mutex; | |
da53d61e | 145 | ktime_t time_stamp; |
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146 | }; |
147 | ||
148 | struct od_cpu_dbs_info_s { | |
149 | struct cpu_dbs_common_info cdbs; | |
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150 | struct cpufreq_frequency_table *freq_table; |
151 | unsigned int freq_lo; | |
152 | unsigned int freq_lo_jiffies; | |
153 | unsigned int freq_hi_jiffies; | |
154 | unsigned int rate_mult; | |
155 | unsigned int sample_type:1; | |
156 | }; | |
157 | ||
158 | struct cs_cpu_dbs_info_s { | |
159 | struct cpu_dbs_common_info cdbs; | |
160 | unsigned int down_skip; | |
161 | unsigned int requested_freq; | |
162 | unsigned int enable:1; | |
163 | }; | |
164 | ||
4d5dcc42 | 165 | /* Per policy Governers sysfs tunables */ |
4471a34f | 166 | struct od_dbs_tuners { |
6c4640c3 | 167 | unsigned int ignore_nice_load; |
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168 | unsigned int sampling_rate; |
169 | unsigned int sampling_down_factor; | |
170 | unsigned int up_threshold; | |
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171 | unsigned int powersave_bias; |
172 | unsigned int io_is_busy; | |
173 | }; | |
174 | ||
175 | struct cs_dbs_tuners { | |
6c4640c3 | 176 | unsigned int ignore_nice_load; |
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177 | unsigned int sampling_rate; |
178 | unsigned int sampling_down_factor; | |
179 | unsigned int up_threshold; | |
180 | unsigned int down_threshold; | |
181 | unsigned int freq_step; | |
182 | }; | |
183 | ||
4d5dcc42 VK |
184 | /* Common Governer data across policies */ |
185 | struct dbs_data; | |
186 | struct common_dbs_data { | |
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187 | /* Common across governors */ |
188 | #define GOV_ONDEMAND 0 | |
189 | #define GOV_CONSERVATIVE 1 | |
190 | int governor; | |
4d5dcc42 VK |
191 | struct attribute_group *attr_group_gov_sys; /* one governor - system */ |
192 | struct attribute_group *attr_group_gov_pol; /* one governor - policy */ | |
4471a34f | 193 | |
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194 | /* Common data for platforms that don't set have_governor_per_policy */ |
195 | struct dbs_data *gdbs_data; | |
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196 | |
197 | struct cpu_dbs_common_info *(*get_cpu_cdbs)(int cpu); | |
198 | void *(*get_cpu_dbs_info_s)(int cpu); | |
199 | void (*gov_dbs_timer)(struct work_struct *work); | |
200 | void (*gov_check_cpu)(int cpu, unsigned int load); | |
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201 | int (*init)(struct dbs_data *dbs_data); |
202 | void (*exit)(struct dbs_data *dbs_data); | |
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203 | |
204 | /* Governor specific ops, see below */ | |
205 | void *gov_ops; | |
206 | }; | |
207 | ||
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208 | /* Governer Per policy data */ |
209 | struct dbs_data { | |
210 | struct common_dbs_data *cdata; | |
211 | unsigned int min_sampling_rate; | |
a97c98ad | 212 | int usage_count; |
4d5dcc42 VK |
213 | void *tuners; |
214 | ||
215 | /* dbs_mutex protects dbs_enable in governor start/stop */ | |
216 | struct mutex mutex; | |
217 | }; | |
218 | ||
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219 | /* Governor specific ops, will be passed to dbs_data->gov_ops */ |
220 | struct od_ops { | |
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221 | void (*powersave_bias_init_cpu)(int cpu); |
222 | unsigned int (*powersave_bias_target)(struct cpufreq_policy *policy, | |
223 | unsigned int freq_next, unsigned int relation); | |
3a3e9e06 | 224 | void (*freq_increase)(struct cpufreq_policy *policy, unsigned int freq); |
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225 | }; |
226 | ||
227 | struct cs_ops { | |
228 | struct notifier_block *notifier_block; | |
229 | }; | |
230 | ||
231 | static inline int delay_for_sampling_rate(unsigned int sampling_rate) | |
232 | { | |
233 | int delay = usecs_to_jiffies(sampling_rate); | |
234 | ||
235 | /* We want all CPUs to do sampling nearly on same jiffy */ | |
236 | if (num_online_cpus() > 1) | |
237 | delay -= jiffies % delay; | |
238 | ||
239 | return delay; | |
240 | } | |
241 | ||
4d5dcc42 VK |
242 | #define declare_show_sampling_rate_min(_gov) \ |
243 | static ssize_t show_sampling_rate_min_gov_sys \ | |
244 | (struct kobject *kobj, struct attribute *attr, char *buf) \ | |
245 | { \ | |
246 | struct dbs_data *dbs_data = _gov##_dbs_cdata.gdbs_data; \ | |
247 | return sprintf(buf, "%u\n", dbs_data->min_sampling_rate); \ | |
248 | } \ | |
249 | \ | |
250 | static ssize_t show_sampling_rate_min_gov_pol \ | |
251 | (struct cpufreq_policy *policy, char *buf) \ | |
252 | { \ | |
253 | struct dbs_data *dbs_data = policy->governor_data; \ | |
254 | return sprintf(buf, "%u\n", dbs_data->min_sampling_rate); \ | |
255 | } | |
256 | ||
4471a34f | 257 | void dbs_check_cpu(struct dbs_data *dbs_data, int cpu); |
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258 | bool need_load_eval(struct cpu_dbs_common_info *cdbs, |
259 | unsigned int sampling_rate); | |
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260 | int cpufreq_governor_dbs(struct cpufreq_policy *policy, |
261 | struct common_dbs_data *cdata, unsigned int event); | |
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262 | void gov_queue_work(struct dbs_data *dbs_data, struct cpufreq_policy *policy, |
263 | unsigned int delay, bool all_cpus); | |
fb30809e JS |
264 | void od_register_powersave_bias_handler(unsigned int (*f) |
265 | (struct cpufreq_policy *, unsigned int, unsigned int), | |
266 | unsigned int powersave_bias); | |
267 | void od_unregister_powersave_bias_handler(void); | |
beb0ff39 | 268 | #endif /* _CPUFREQ_GOVERNOR_H */ |