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4471a34f VK |
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 | ||
17 | #ifndef _CPUFREQ_GOVERNER_H | |
18 | #define _CPUFREQ_GOVERNER_H | |
19 | ||
4471a34f VK |
20 | #include <linux/cpufreq.h> |
21 | #include <linux/kobject.h> | |
22 | #include <linux/mutex.h> | |
23 | #include <linux/workqueue.h> | |
24 | #include <linux/sysfs.h> | |
25 | ||
26 | /* | |
27 | * The polling frequency depends on the capability of the processor. Default | |
28 | * polling frequency is 1000 times the transition latency of the processor. The | |
29 | * governor will work on any processor with transition latency <= 10mS, using | |
30 | * appropriate sampling rate. | |
31 | * | |
32 | * For CPUs with transition latency > 10mS (mostly drivers with CPUFREQ_ETERNAL) | |
33 | * this governor will not work. All times here are in uS. | |
34 | */ | |
35 | #define MIN_SAMPLING_RATE_RATIO (2) | |
36 | #define LATENCY_MULTIPLIER (1000) | |
37 | #define MIN_LATENCY_MULTIPLIER (100) | |
38 | #define TRANSITION_LATENCY_LIMIT (10 * 1000 * 1000) | |
39 | ||
40 | /* Ondemand Sampling types */ | |
41 | enum {OD_NORMAL_SAMPLE, OD_SUB_SAMPLE}; | |
42 | ||
43 | /* Macro creating sysfs show routines */ | |
44 | #define show_one(_gov, file_name, object) \ | |
45 | static ssize_t show_##file_name \ | |
46 | (struct kobject *kobj, struct attribute *attr, char *buf) \ | |
47 | { \ | |
48 | return sprintf(buf, "%u\n", _gov##_tuners.object); \ | |
49 | } | |
50 | ||
51 | #define define_get_cpu_dbs_routines(_dbs_info) \ | |
52 | static struct cpu_dbs_common_info *get_cpu_cdbs(int cpu) \ | |
53 | { \ | |
54 | return &per_cpu(_dbs_info, cpu).cdbs; \ | |
55 | } \ | |
56 | \ | |
57 | static void *get_cpu_dbs_info_s(int cpu) \ | |
58 | { \ | |
59 | return &per_cpu(_dbs_info, cpu); \ | |
60 | } | |
61 | ||
62 | /* | |
63 | * Abbreviations: | |
64 | * dbs: used as a shortform for demand based switching It helps to keep variable | |
65 | * names smaller, simpler | |
66 | * cdbs: common dbs | |
e5dde92c | 67 | * od_*: On-demand governor |
4471a34f VK |
68 | * cs_*: Conservative governor |
69 | */ | |
70 | ||
71 | /* Per cpu structures */ | |
72 | struct cpu_dbs_common_info { | |
73 | int cpu; | |
1e7586a1 VK |
74 | u64 prev_cpu_idle; |
75 | u64 prev_cpu_wall; | |
76 | u64 prev_cpu_nice; | |
4471a34f VK |
77 | struct cpufreq_policy *cur_policy; |
78 | struct delayed_work work; | |
79 | /* | |
80 | * percpu mutex that serializes governor limit change with gov_dbs_timer | |
81 | * invocation. We do not want gov_dbs_timer to run when user is changing | |
82 | * the governor or limits. | |
83 | */ | |
84 | struct mutex timer_mutex; | |
da53d61e | 85 | ktime_t time_stamp; |
4471a34f VK |
86 | }; |
87 | ||
88 | struct od_cpu_dbs_info_s { | |
89 | struct cpu_dbs_common_info cdbs; | |
1e7586a1 | 90 | u64 prev_cpu_iowait; |
4471a34f VK |
91 | struct cpufreq_frequency_table *freq_table; |
92 | unsigned int freq_lo; | |
93 | unsigned int freq_lo_jiffies; | |
94 | unsigned int freq_hi_jiffies; | |
95 | unsigned int rate_mult; | |
96 | unsigned int sample_type:1; | |
97 | }; | |
98 | ||
99 | struct cs_cpu_dbs_info_s { | |
100 | struct cpu_dbs_common_info cdbs; | |
101 | unsigned int down_skip; | |
102 | unsigned int requested_freq; | |
103 | unsigned int enable:1; | |
104 | }; | |
105 | ||
106 | /* Governers sysfs tunables */ | |
107 | struct od_dbs_tuners { | |
108 | unsigned int ignore_nice; | |
109 | unsigned int sampling_rate; | |
110 | unsigned int sampling_down_factor; | |
111 | unsigned int up_threshold; | |
4bd4e428 | 112 | unsigned int adj_up_threshold; |
4471a34f VK |
113 | unsigned int powersave_bias; |
114 | unsigned int io_is_busy; | |
115 | }; | |
116 | ||
117 | struct cs_dbs_tuners { | |
118 | unsigned int ignore_nice; | |
119 | unsigned int sampling_rate; | |
120 | unsigned int sampling_down_factor; | |
121 | unsigned int up_threshold; | |
122 | unsigned int down_threshold; | |
123 | unsigned int freq_step; | |
124 | }; | |
125 | ||
126 | /* Per Governer data */ | |
127 | struct dbs_data { | |
128 | /* Common across governors */ | |
129 | #define GOV_ONDEMAND 0 | |
130 | #define GOV_CONSERVATIVE 1 | |
131 | int governor; | |
132 | unsigned int min_sampling_rate; | |
4471a34f VK |
133 | struct attribute_group *attr_group; |
134 | void *tuners; | |
135 | ||
136 | /* dbs_mutex protects dbs_enable in governor start/stop */ | |
137 | struct mutex mutex; | |
138 | ||
139 | struct cpu_dbs_common_info *(*get_cpu_cdbs)(int cpu); | |
140 | void *(*get_cpu_dbs_info_s)(int cpu); | |
141 | void (*gov_dbs_timer)(struct work_struct *work); | |
142 | void (*gov_check_cpu)(int cpu, unsigned int load); | |
143 | ||
144 | /* Governor specific ops, see below */ | |
145 | void *gov_ops; | |
146 | }; | |
147 | ||
148 | /* Governor specific ops, will be passed to dbs_data->gov_ops */ | |
149 | struct od_ops { | |
150 | int (*io_busy)(void); | |
151 | void (*powersave_bias_init_cpu)(int cpu); | |
152 | unsigned int (*powersave_bias_target)(struct cpufreq_policy *policy, | |
153 | unsigned int freq_next, unsigned int relation); | |
154 | void (*freq_increase)(struct cpufreq_policy *p, unsigned int freq); | |
155 | }; | |
156 | ||
157 | struct cs_ops { | |
158 | struct notifier_block *notifier_block; | |
159 | }; | |
160 | ||
161 | static inline int delay_for_sampling_rate(unsigned int sampling_rate) | |
162 | { | |
163 | int delay = usecs_to_jiffies(sampling_rate); | |
164 | ||
165 | /* We want all CPUs to do sampling nearly on same jiffy */ | |
166 | if (num_online_cpus() > 1) | |
167 | delay -= jiffies % delay; | |
168 | ||
169 | return delay; | |
170 | } | |
171 | ||
1e7586a1 | 172 | u64 get_cpu_idle_time(unsigned int cpu, u64 *wall); |
4471a34f | 173 | void dbs_check_cpu(struct dbs_data *dbs_data, int cpu); |
4447266b VK |
174 | bool need_load_eval(struct cpu_dbs_common_info *cdbs, |
175 | unsigned int sampling_rate); | |
4471a34f VK |
176 | int cpufreq_governor_dbs(struct dbs_data *dbs_data, |
177 | struct cpufreq_policy *policy, unsigned int event); | |
178 | #endif /* _CPUFREQ_GOVERNER_H */ |