Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * drivers/cpufreq/cpufreq_ondemand.c |
| 3 | * |
| 4 | * Copyright (C) 2001 Russell King |
| 5 | * (C) 2003 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>. |
| 6 | * Jun Nakajima <jun.nakajima@intel.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/cpufreq.h> |
Andrew Morton | 138a0128 | 2006-06-23 03:31:19 -0700 | [diff] [blame] | 17 | #include <linux/cpu.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/jiffies.h> |
| 19 | #include <linux/kernel_stat.h> |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 20 | #include <linux/mutex.h> |
venkatesh.pallipadi@intel.com | 8080091 | 2008-08-04 11:59:12 -0700 | [diff] [blame] | 21 | #include <linux/hrtimer.h> |
| 22 | #include <linux/tick.h> |
| 23 | #include <linux/ktime.h> |
Thomas Renninger | 9411b4e | 2009-02-04 11:54:04 +0100 | [diff] [blame] | 24 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
| 26 | /* |
| 27 | * dbs is used in this file as a shortform for demandbased switching |
| 28 | * It helps to keep variable names smaller, simpler |
| 29 | */ |
| 30 | |
venkatesh.pallipadi@intel.com | e9d95bf | 2008-08-04 11:59:10 -0700 | [diff] [blame] | 31 | #define DEF_FREQUENCY_DOWN_DIFFERENTIAL (10) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #define DEF_FREQUENCY_UP_THRESHOLD (80) |
venkatesh.pallipadi@intel.com | 8080091 | 2008-08-04 11:59:12 -0700 | [diff] [blame] | 33 | #define MICRO_FREQUENCY_DOWN_DIFFERENTIAL (3) |
| 34 | #define MICRO_FREQUENCY_UP_THRESHOLD (95) |
Thomas Renninger | cef9615 | 2009-04-22 13:48:29 +0200 | [diff] [blame] | 35 | #define MICRO_FREQUENCY_MIN_SAMPLE_RATE (10000) |
Dave Jones | c29f140 | 2005-05-31 19:03:50 -0700 | [diff] [blame] | 36 | #define MIN_FREQUENCY_UP_THRESHOLD (11) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #define MAX_FREQUENCY_UP_THRESHOLD (100) |
| 38 | |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 39 | /* |
| 40 | * The polling frequency of this governor depends on the capability of |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | * the processor. Default polling frequency is 1000 times the transition |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 42 | * latency of the processor. The governor will work on any processor with |
| 43 | * transition latency <= 10mS, using appropriate sampling |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | * rate. |
| 45 | * For CPUs with transition latency > 10mS (mostly drivers with CPUFREQ_ETERNAL) |
| 46 | * this governor will not work. |
| 47 | * All times here are in uS. |
| 48 | */ |
Dave Jones | df8b59b | 2005-09-20 12:39:35 -0700 | [diff] [blame] | 49 | #define MIN_SAMPLING_RATE_RATIO (2) |
Thomas Renninger | 112124a | 2009-02-04 11:55:12 +0100 | [diff] [blame] | 50 | |
Thomas Renninger | cef9615 | 2009-04-22 13:48:29 +0200 | [diff] [blame] | 51 | static unsigned int min_sampling_rate; |
| 52 | |
Thomas Renninger | 112124a | 2009-02-04 11:55:12 +0100 | [diff] [blame] | 53 | #define LATENCY_MULTIPLIER (1000) |
Thomas Renninger | cef9615 | 2009-04-22 13:48:29 +0200 | [diff] [blame] | 54 | #define MIN_LATENCY_MULTIPLIER (100) |
Thomas Renninger | 1c25624 | 2007-10-02 13:28:12 -0700 | [diff] [blame] | 55 | #define TRANSITION_LATENCY_LIMIT (10 * 1000 * 1000) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 57 | static void do_dbs_timer(struct work_struct *work); |
Thomas Renninger | 0e625ac | 2009-07-24 15:25:06 +0200 | [diff] [blame] | 58 | static int cpufreq_governor_dbs(struct cpufreq_policy *policy, |
| 59 | unsigned int event); |
| 60 | |
| 61 | #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
| 62 | static |
| 63 | #endif |
| 64 | struct cpufreq_governor cpufreq_gov_ondemand = { |
| 65 | .name = "ondemand", |
| 66 | .governor = cpufreq_governor_dbs, |
| 67 | .max_transition_latency = TRANSITION_LATENCY_LIMIT, |
| 68 | .owner = THIS_MODULE, |
| 69 | }; |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 70 | |
| 71 | /* Sampling types */ |
Venkatesh Pallipadi | 529af7a | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 72 | enum {DBS_NORMAL_SAMPLE, DBS_SUB_SAMPLE}; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
| 74 | struct cpu_dbs_info_s { |
Venkatesh Pallipadi | ccb2fe2 | 2006-06-28 13:49:52 -0700 | [diff] [blame] | 75 | cputime64_t prev_cpu_idle; |
| 76 | cputime64_t prev_cpu_wall; |
venkatesh.pallipadi@intel.com | 8080091 | 2008-08-04 11:59:12 -0700 | [diff] [blame] | 77 | cputime64_t prev_cpu_nice; |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 78 | struct cpufreq_policy *cur_policy; |
Dave Jones | 2b03f89 | 2009-01-18 01:43:44 -0500 | [diff] [blame] | 79 | struct delayed_work work; |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 80 | struct cpufreq_frequency_table *freq_table; |
| 81 | unsigned int freq_lo; |
| 82 | unsigned int freq_lo_jiffies; |
| 83 | unsigned int freq_hi_jiffies; |
Venkatesh Pallipadi | 529af7a | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 84 | int cpu; |
venkatesh.pallipadi@intel.com | 5a75c82 | 2009-07-02 17:08:32 -0700 | [diff] [blame] | 85 | unsigned int sample_type:1; |
| 86 | /* |
| 87 | * percpu mutex that serializes governor limit change with |
| 88 | * do_dbs_timer invocation. We do not want do_dbs_timer to run |
| 89 | * when user is changing the governor or limits. |
| 90 | */ |
| 91 | struct mutex timer_mutex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | }; |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 93 | static DEFINE_PER_CPU(struct cpu_dbs_info_s, od_cpu_dbs_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
| 95 | static unsigned int dbs_enable; /* number of CPUs using this policy */ |
| 96 | |
Venkatesh Pallipadi | 4ec223d | 2006-06-21 15:18:34 -0700 | [diff] [blame] | 97 | /* |
venkatesh.pallipadi@intel.com | 7d26e2d | 2009-07-02 17:08:30 -0700 | [diff] [blame] | 98 | * dbs_mutex protects data in dbs_tuners_ins from concurrent changes on |
venkatesh.pallipadi@intel.com | 5a75c82 | 2009-07-02 17:08:32 -0700 | [diff] [blame] | 99 | * different CPUs. It protects dbs_enable in governor start/stop. |
Venkatesh Pallipadi | 4ec223d | 2006-06-21 15:18:34 -0700 | [diff] [blame] | 100 | */ |
Venkatesh Pallipadi | ffac80e | 2006-06-28 13:52:18 -0700 | [diff] [blame] | 101 | static DEFINE_MUTEX(dbs_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
Venkatesh Pallipadi | 2f8a835 | 2006-06-28 13:51:19 -0700 | [diff] [blame] | 103 | static struct workqueue_struct *kondemand_wq; |
Andi Kleen | 6810b54 | 2006-05-08 15:17:31 +0200 | [diff] [blame] | 104 | |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 105 | static struct dbs_tuners { |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 106 | unsigned int sampling_rate; |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 107 | unsigned int up_threshold; |
venkatesh.pallipadi@intel.com | e9d95bf | 2008-08-04 11:59:10 -0700 | [diff] [blame] | 108 | unsigned int down_differential; |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 109 | unsigned int ignore_nice; |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 110 | unsigned int powersave_bias; |
| 111 | } dbs_tuners_ins = { |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 112 | .up_threshold = DEF_FREQUENCY_UP_THRESHOLD, |
venkatesh.pallipadi@intel.com | e9d95bf | 2008-08-04 11:59:10 -0700 | [diff] [blame] | 113 | .down_differential = DEF_FREQUENCY_DOWN_DIFFERENTIAL, |
Eric Piel | 9cbad61 | 2006-03-10 11:35:27 +0200 | [diff] [blame] | 114 | .ignore_nice = 0, |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 115 | .powersave_bias = 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | }; |
| 117 | |
venkatesh.pallipadi@intel.com | 8080091 | 2008-08-04 11:59:12 -0700 | [diff] [blame] | 118 | static inline cputime64_t get_cpu_idle_time_jiffy(unsigned int cpu, |
| 119 | cputime64_t *wall) |
Dave Jones | dac1c1a | 2005-05-31 19:03:49 -0700 | [diff] [blame] | 120 | { |
Venki Pallipadi | ea48761 | 2007-06-20 14:26:24 -0700 | [diff] [blame] | 121 | cputime64_t idle_time; |
venkatesh.pallipadi@intel.com | 3430502 | 2008-08-04 11:59:09 -0700 | [diff] [blame] | 122 | cputime64_t cur_wall_time; |
Venki Pallipadi | ea48761 | 2007-06-20 14:26:24 -0700 | [diff] [blame] | 123 | cputime64_t busy_time; |
Venkatesh Pallipadi | ccb2fe2 | 2006-06-28 13:49:52 -0700 | [diff] [blame] | 124 | |
venkatesh.pallipadi@intel.com | 3430502 | 2008-08-04 11:59:09 -0700 | [diff] [blame] | 125 | cur_wall_time = jiffies64_to_cputime64(get_jiffies_64()); |
Venki Pallipadi | ea48761 | 2007-06-20 14:26:24 -0700 | [diff] [blame] | 126 | busy_time = cputime64_add(kstat_cpu(cpu).cpustat.user, |
| 127 | kstat_cpu(cpu).cpustat.system); |
Venkatesh Pallipadi | ccb2fe2 | 2006-06-28 13:49:52 -0700 | [diff] [blame] | 128 | |
Venki Pallipadi | ea48761 | 2007-06-20 14:26:24 -0700 | [diff] [blame] | 129 | busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.irq); |
| 130 | busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.softirq); |
| 131 | busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.steal); |
Venkatesh Pallipadi | 1ca3abd | 2009-01-23 09:25:02 -0500 | [diff] [blame] | 132 | busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.nice); |
Venki Pallipadi | ea48761 | 2007-06-20 14:26:24 -0700 | [diff] [blame] | 133 | |
venkatesh.pallipadi@intel.com | 3430502 | 2008-08-04 11:59:09 -0700 | [diff] [blame] | 134 | idle_time = cputime64_sub(cur_wall_time, busy_time); |
| 135 | if (wall) |
Pallipadi, Venkatesh | 54c9a35 | 2009-11-11 16:50:29 -0800 | [diff] [blame] | 136 | *wall = (cputime64_t)jiffies_to_usecs(cur_wall_time); |
venkatesh.pallipadi@intel.com | 3430502 | 2008-08-04 11:59:09 -0700 | [diff] [blame] | 137 | |
Pallipadi, Venkatesh | 54c9a35 | 2009-11-11 16:50:29 -0800 | [diff] [blame] | 138 | return (cputime64_t)jiffies_to_usecs(idle_time); |
Dave Jones | dac1c1a | 2005-05-31 19:03:49 -0700 | [diff] [blame] | 139 | } |
| 140 | |
venkatesh.pallipadi@intel.com | 8080091 | 2008-08-04 11:59:12 -0700 | [diff] [blame] | 141 | static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall) |
| 142 | { |
| 143 | u64 idle_time = get_cpu_idle_time_us(cpu, wall); |
| 144 | |
| 145 | if (idle_time == -1ULL) |
| 146 | return get_cpu_idle_time_jiffy(cpu, wall); |
| 147 | |
venkatesh.pallipadi@intel.com | 8080091 | 2008-08-04 11:59:12 -0700 | [diff] [blame] | 148 | return idle_time; |
| 149 | } |
| 150 | |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 151 | /* |
| 152 | * Find right freq to be set now with powersave_bias on. |
| 153 | * Returns the freq_hi to be used right now and will set freq_hi_jiffies, |
| 154 | * freq_lo, and freq_lo_jiffies in percpu area for averaging freqs. |
| 155 | */ |
Adrian Bunk | b5ecf60 | 2006-08-13 23:00:08 +0200 | [diff] [blame] | 156 | static unsigned int powersave_bias_target(struct cpufreq_policy *policy, |
| 157 | unsigned int freq_next, |
| 158 | unsigned int relation) |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 159 | { |
| 160 | unsigned int freq_req, freq_reduc, freq_avg; |
| 161 | unsigned int freq_hi, freq_lo; |
| 162 | unsigned int index = 0; |
| 163 | unsigned int jiffies_total, jiffies_hi, jiffies_lo; |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 164 | struct cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, |
| 165 | policy->cpu); |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 166 | |
| 167 | if (!dbs_info->freq_table) { |
| 168 | dbs_info->freq_lo = 0; |
| 169 | dbs_info->freq_lo_jiffies = 0; |
| 170 | return freq_next; |
| 171 | } |
| 172 | |
| 173 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_next, |
| 174 | relation, &index); |
| 175 | freq_req = dbs_info->freq_table[index].frequency; |
| 176 | freq_reduc = freq_req * dbs_tuners_ins.powersave_bias / 1000; |
| 177 | freq_avg = freq_req - freq_reduc; |
| 178 | |
| 179 | /* Find freq bounds for freq_avg in freq_table */ |
| 180 | index = 0; |
| 181 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, |
| 182 | CPUFREQ_RELATION_H, &index); |
| 183 | freq_lo = dbs_info->freq_table[index].frequency; |
| 184 | index = 0; |
| 185 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, |
| 186 | CPUFREQ_RELATION_L, &index); |
| 187 | freq_hi = dbs_info->freq_table[index].frequency; |
| 188 | |
| 189 | /* Find out how long we have to be in hi and lo freqs */ |
| 190 | if (freq_hi == freq_lo) { |
| 191 | dbs_info->freq_lo = 0; |
| 192 | dbs_info->freq_lo_jiffies = 0; |
| 193 | return freq_lo; |
| 194 | } |
| 195 | jiffies_total = usecs_to_jiffies(dbs_tuners_ins.sampling_rate); |
| 196 | jiffies_hi = (freq_avg - freq_lo) * jiffies_total; |
| 197 | jiffies_hi += ((freq_hi - freq_lo) / 2); |
| 198 | jiffies_hi /= (freq_hi - freq_lo); |
| 199 | jiffies_lo = jiffies_total - jiffies_hi; |
| 200 | dbs_info->freq_lo = freq_lo; |
| 201 | dbs_info->freq_lo_jiffies = jiffies_lo; |
| 202 | dbs_info->freq_hi_jiffies = jiffies_hi; |
| 203 | return freq_hi; |
| 204 | } |
| 205 | |
venkatesh.pallipadi@intel.com | 5a75c82 | 2009-07-02 17:08:32 -0700 | [diff] [blame] | 206 | static void ondemand_powersave_bias_init_cpu(int cpu) |
| 207 | { |
Tejun Heo | 384be2b | 2009-08-14 14:41:02 +0900 | [diff] [blame] | 208 | struct cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu); |
venkatesh.pallipadi@intel.com | 5a75c82 | 2009-07-02 17:08:32 -0700 | [diff] [blame] | 209 | dbs_info->freq_table = cpufreq_frequency_get_table(cpu); |
| 210 | dbs_info->freq_lo = 0; |
| 211 | } |
| 212 | |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 213 | static void ondemand_powersave_bias_init(void) |
| 214 | { |
| 215 | int i; |
| 216 | for_each_online_cpu(i) { |
venkatesh.pallipadi@intel.com | 5a75c82 | 2009-07-02 17:08:32 -0700 | [diff] [blame] | 217 | ondemand_powersave_bias_init_cpu(i); |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 218 | } |
| 219 | } |
| 220 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | /************************** sysfs interface ************************/ |
Thomas Renninger | 0e625ac | 2009-07-24 15:25:06 +0200 | [diff] [blame] | 222 | |
| 223 | static ssize_t show_sampling_rate_max(struct kobject *kobj, |
| 224 | struct attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | { |
Thomas Renninger | 4f4d1ad | 2009-04-22 13:48:31 +0200 | [diff] [blame] | 226 | printk_once(KERN_INFO "CPUFREQ: ondemand sampling_rate_max " |
| 227 | "sysfs file is deprecated - used by: %s\n", current->comm); |
Thomas Renninger | cef9615 | 2009-04-22 13:48:29 +0200 | [diff] [blame] | 228 | return sprintf(buf, "%u\n", -1U); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | } |
| 230 | |
Thomas Renninger | 0e625ac | 2009-07-24 15:25:06 +0200 | [diff] [blame] | 231 | static ssize_t show_sampling_rate_min(struct kobject *kobj, |
| 232 | struct attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | { |
Thomas Renninger | cef9615 | 2009-04-22 13:48:29 +0200 | [diff] [blame] | 234 | return sprintf(buf, "%u\n", min_sampling_rate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | } |
| 236 | |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 237 | #define define_one_ro(_name) \ |
Thomas Renninger | 0e625ac | 2009-07-24 15:25:06 +0200 | [diff] [blame] | 238 | static struct global_attr _name = \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | __ATTR(_name, 0444, show_##_name, NULL) |
| 240 | |
| 241 | define_one_ro(sampling_rate_max); |
| 242 | define_one_ro(sampling_rate_min); |
| 243 | |
| 244 | /* cpufreq_ondemand Governor Tunables */ |
| 245 | #define show_one(file_name, object) \ |
| 246 | static ssize_t show_##file_name \ |
Thomas Renninger | 0e625ac | 2009-07-24 15:25:06 +0200 | [diff] [blame] | 247 | (struct kobject *kobj, struct attribute *attr, char *buf) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | { \ |
| 249 | return sprintf(buf, "%u\n", dbs_tuners_ins.object); \ |
| 250 | } |
| 251 | show_one(sampling_rate, sampling_rate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | show_one(up_threshold, up_threshold); |
Alexander Clouter | 001893c | 2005-12-01 01:09:25 -0800 | [diff] [blame] | 253 | show_one(ignore_nice_load, ignore_nice); |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 254 | show_one(powersave_bias, powersave_bias); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | |
Thomas Renninger | 0e625ac | 2009-07-24 15:25:06 +0200 | [diff] [blame] | 256 | /*** delete after deprecation time ***/ |
| 257 | |
| 258 | #define DEPRECATION_MSG(file_name) \ |
| 259 | printk_once(KERN_INFO "CPUFREQ: Per core ondemand sysfs " \ |
| 260 | "interface is deprecated - " #file_name "\n"); |
| 261 | |
| 262 | #define show_one_old(file_name) \ |
| 263 | static ssize_t show_##file_name##_old \ |
| 264 | (struct cpufreq_policy *unused, char *buf) \ |
| 265 | { \ |
| 266 | printk_once(KERN_INFO "CPUFREQ: Per core ondemand sysfs " \ |
| 267 | "interface is deprecated - " #file_name "\n"); \ |
| 268 | return show_##file_name(NULL, NULL, buf); \ |
| 269 | } |
| 270 | show_one_old(sampling_rate); |
| 271 | show_one_old(up_threshold); |
| 272 | show_one_old(ignore_nice_load); |
| 273 | show_one_old(powersave_bias); |
| 274 | show_one_old(sampling_rate_min); |
| 275 | show_one_old(sampling_rate_max); |
| 276 | |
| 277 | #define define_one_ro_old(object, _name) \ |
| 278 | static struct freq_attr object = \ |
| 279 | __ATTR(_name, 0444, show_##_name##_old, NULL) |
| 280 | |
| 281 | define_one_ro_old(sampling_rate_min_old, sampling_rate_min); |
| 282 | define_one_ro_old(sampling_rate_max_old, sampling_rate_max); |
| 283 | |
| 284 | /*** delete after deprecation time ***/ |
| 285 | |
| 286 | static ssize_t store_sampling_rate(struct kobject *a, struct attribute *b, |
| 287 | const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | { |
| 289 | unsigned int input; |
| 290 | int ret; |
Venkatesh Pallipadi | ffac80e | 2006-06-28 13:52:18 -0700 | [diff] [blame] | 291 | ret = sscanf(buf, "%u", &input); |
venkatesh.pallipadi@intel.com | 5a75c82 | 2009-07-02 17:08:32 -0700 | [diff] [blame] | 292 | if (ret != 1) |
| 293 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 295 | mutex_lock(&dbs_mutex); |
Thomas Renninger | cef9615 | 2009-04-22 13:48:29 +0200 | [diff] [blame] | 296 | dbs_tuners_ins.sampling_rate = max(input, min_sampling_rate); |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 297 | mutex_unlock(&dbs_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | |
| 299 | return count; |
| 300 | } |
| 301 | |
Thomas Renninger | 0e625ac | 2009-07-24 15:25:06 +0200 | [diff] [blame] | 302 | static ssize_t store_up_threshold(struct kobject *a, struct attribute *b, |
| 303 | const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | { |
| 305 | unsigned int input; |
| 306 | int ret; |
Venkatesh Pallipadi | ffac80e | 2006-06-28 13:52:18 -0700 | [diff] [blame] | 307 | ret = sscanf(buf, "%u", &input); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 309 | if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD || |
Dave Jones | c29f140 | 2005-05-31 19:03:50 -0700 | [diff] [blame] | 310 | input < MIN_FREQUENCY_UP_THRESHOLD) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | return -EINVAL; |
| 312 | } |
| 313 | |
venkatesh.pallipadi@intel.com | 5a75c82 | 2009-07-02 17:08:32 -0700 | [diff] [blame] | 314 | mutex_lock(&dbs_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | dbs_tuners_ins.up_threshold = input; |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 316 | mutex_unlock(&dbs_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | |
| 318 | return count; |
| 319 | } |
| 320 | |
Thomas Renninger | 0e625ac | 2009-07-24 15:25:06 +0200 | [diff] [blame] | 321 | static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b, |
| 322 | const char *buf, size_t count) |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 323 | { |
| 324 | unsigned int input; |
| 325 | int ret; |
| 326 | |
| 327 | unsigned int j; |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 328 | |
Venkatesh Pallipadi | ffac80e | 2006-06-28 13:52:18 -0700 | [diff] [blame] | 329 | ret = sscanf(buf, "%u", &input); |
Dave Jones | 2b03f89 | 2009-01-18 01:43:44 -0500 | [diff] [blame] | 330 | if (ret != 1) |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 331 | return -EINVAL; |
| 332 | |
Dave Jones | 2b03f89 | 2009-01-18 01:43:44 -0500 | [diff] [blame] | 333 | if (input > 1) |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 334 | input = 1; |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 335 | |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 336 | mutex_lock(&dbs_mutex); |
Dave Jones | 2b03f89 | 2009-01-18 01:43:44 -0500 | [diff] [blame] | 337 | if (input == dbs_tuners_ins.ignore_nice) { /* nothing to do */ |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 338 | mutex_unlock(&dbs_mutex); |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 339 | return count; |
| 340 | } |
| 341 | dbs_tuners_ins.ignore_nice = input; |
| 342 | |
Venkatesh Pallipadi | ccb2fe2 | 2006-06-28 13:49:52 -0700 | [diff] [blame] | 343 | /* we need to re-evaluate prev_cpu_idle */ |
Dave Jones | dac1c1a | 2005-05-31 19:03:49 -0700 | [diff] [blame] | 344 | for_each_online_cpu(j) { |
Venkatesh Pallipadi | ccb2fe2 | 2006-06-28 13:49:52 -0700 | [diff] [blame] | 345 | struct cpu_dbs_info_s *dbs_info; |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 346 | dbs_info = &per_cpu(od_cpu_dbs_info, j); |
venkatesh.pallipadi@intel.com | 3430502 | 2008-08-04 11:59:09 -0700 | [diff] [blame] | 347 | dbs_info->prev_cpu_idle = get_cpu_idle_time(j, |
| 348 | &dbs_info->prev_cpu_wall); |
Venkatesh Pallipadi | 1ca3abd | 2009-01-23 09:25:02 -0500 | [diff] [blame] | 349 | if (dbs_tuners_ins.ignore_nice) |
| 350 | dbs_info->prev_cpu_nice = kstat_cpu(j).cpustat.nice; |
| 351 | |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 352 | } |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 353 | mutex_unlock(&dbs_mutex); |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 354 | |
| 355 | return count; |
| 356 | } |
| 357 | |
Thomas Renninger | 0e625ac | 2009-07-24 15:25:06 +0200 | [diff] [blame] | 358 | static ssize_t store_powersave_bias(struct kobject *a, struct attribute *b, |
| 359 | const char *buf, size_t count) |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 360 | { |
| 361 | unsigned int input; |
| 362 | int ret; |
| 363 | ret = sscanf(buf, "%u", &input); |
| 364 | |
| 365 | if (ret != 1) |
| 366 | return -EINVAL; |
| 367 | |
| 368 | if (input > 1000) |
| 369 | input = 1000; |
| 370 | |
| 371 | mutex_lock(&dbs_mutex); |
| 372 | dbs_tuners_ins.powersave_bias = input; |
| 373 | ondemand_powersave_bias_init(); |
| 374 | mutex_unlock(&dbs_mutex); |
| 375 | |
| 376 | return count; |
| 377 | } |
| 378 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | #define define_one_rw(_name) \ |
Thomas Renninger | 0e625ac | 2009-07-24 15:25:06 +0200 | [diff] [blame] | 380 | static struct global_attr _name = \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | __ATTR(_name, 0644, show_##_name, store_##_name) |
| 382 | |
| 383 | define_one_rw(sampling_rate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | define_one_rw(up_threshold); |
Alexander Clouter | 001893c | 2005-12-01 01:09:25 -0800 | [diff] [blame] | 385 | define_one_rw(ignore_nice_load); |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 386 | define_one_rw(powersave_bias); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | |
Dave Jones | 2b03f89 | 2009-01-18 01:43:44 -0500 | [diff] [blame] | 388 | static struct attribute *dbs_attributes[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | &sampling_rate_max.attr, |
| 390 | &sampling_rate_min.attr, |
| 391 | &sampling_rate.attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | &up_threshold.attr, |
Alexander Clouter | 001893c | 2005-12-01 01:09:25 -0800 | [diff] [blame] | 393 | &ignore_nice_load.attr, |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 394 | &powersave_bias.attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | NULL |
| 396 | }; |
| 397 | |
| 398 | static struct attribute_group dbs_attr_group = { |
| 399 | .attrs = dbs_attributes, |
| 400 | .name = "ondemand", |
| 401 | }; |
| 402 | |
Thomas Renninger | 0e625ac | 2009-07-24 15:25:06 +0200 | [diff] [blame] | 403 | /*** delete after deprecation time ***/ |
| 404 | |
| 405 | #define write_one_old(file_name) \ |
| 406 | static ssize_t store_##file_name##_old \ |
| 407 | (struct cpufreq_policy *unused, const char *buf, size_t count) \ |
| 408 | { \ |
| 409 | printk_once(KERN_INFO "CPUFREQ: Per core ondemand sysfs " \ |
| 410 | "interface is deprecated - " #file_name "\n"); \ |
| 411 | return store_##file_name(NULL, NULL, buf, count); \ |
| 412 | } |
| 413 | write_one_old(sampling_rate); |
| 414 | write_one_old(up_threshold); |
| 415 | write_one_old(ignore_nice_load); |
| 416 | write_one_old(powersave_bias); |
| 417 | |
| 418 | #define define_one_rw_old(object, _name) \ |
| 419 | static struct freq_attr object = \ |
| 420 | __ATTR(_name, 0644, show_##_name##_old, store_##_name##_old) |
| 421 | |
| 422 | define_one_rw_old(sampling_rate_old, sampling_rate); |
| 423 | define_one_rw_old(up_threshold_old, up_threshold); |
| 424 | define_one_rw_old(ignore_nice_load_old, ignore_nice_load); |
| 425 | define_one_rw_old(powersave_bias_old, powersave_bias); |
| 426 | |
| 427 | static struct attribute *dbs_attributes_old[] = { |
| 428 | &sampling_rate_max_old.attr, |
| 429 | &sampling_rate_min_old.attr, |
| 430 | &sampling_rate_old.attr, |
| 431 | &up_threshold_old.attr, |
| 432 | &ignore_nice_load_old.attr, |
| 433 | &powersave_bias_old.attr, |
| 434 | NULL |
| 435 | }; |
| 436 | |
| 437 | static struct attribute_group dbs_attr_group_old = { |
| 438 | .attrs = dbs_attributes_old, |
| 439 | .name = "ondemand", |
| 440 | }; |
| 441 | |
| 442 | /*** delete after deprecation time ***/ |
| 443 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | /************************** sysfs end ************************/ |
| 445 | |
Venkatesh Pallipadi | 2f8a835 | 2006-06-28 13:51:19 -0700 | [diff] [blame] | 446 | static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | { |
venkatesh.pallipadi@intel.com | c43aa3b | 2008-08-04 11:59:08 -0700 | [diff] [blame] | 448 | unsigned int max_load_freq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | |
| 450 | struct cpufreq_policy *policy; |
| 451 | unsigned int j; |
| 452 | |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 453 | this_dbs_info->freq_lo = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | policy = this_dbs_info->cur_policy; |
Venki Pallipadi | ea48761 | 2007-06-20 14:26:24 -0700 | [diff] [blame] | 455 | |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 456 | /* |
Dave Jones | c29f140 | 2005-05-31 19:03:50 -0700 | [diff] [blame] | 457 | * Every sampling_rate, we check, if current idle time is less |
| 458 | * than 20% (default), then we try to increase frequency |
Venkatesh Pallipadi | ccb2fe2 | 2006-06-28 13:49:52 -0700 | [diff] [blame] | 459 | * Every sampling_rate, we look for a the lowest |
Dave Jones | c29f140 | 2005-05-31 19:03:50 -0700 | [diff] [blame] | 460 | * frequency which can sustain the load while keeping idle time over |
| 461 | * 30%. If such a frequency exist, we try to decrease to this frequency. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | * |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 463 | * Any frequency increase takes it to the maximum frequency. |
| 464 | * Frequency reduction happens at minimum steps of |
| 465 | * 5% (default) of current frequency |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | */ |
| 467 | |
venkatesh.pallipadi@intel.com | c43aa3b | 2008-08-04 11:59:08 -0700 | [diff] [blame] | 468 | /* Get Absolute Load - in terms of freq */ |
| 469 | max_load_freq = 0; |
| 470 | |
Rusty Russell | 835481d | 2009-01-04 05:18:06 -0800 | [diff] [blame] | 471 | for_each_cpu(j, policy->cpus) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | struct cpu_dbs_info_s *j_dbs_info; |
venkatesh.pallipadi@intel.com | c43aa3b | 2008-08-04 11:59:08 -0700 | [diff] [blame] | 473 | cputime64_t cur_wall_time, cur_idle_time; |
| 474 | unsigned int idle_time, wall_time; |
| 475 | unsigned int load, load_freq; |
| 476 | int freq_avg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 478 | j_dbs_info = &per_cpu(od_cpu_dbs_info, j); |
venkatesh.pallipadi@intel.com | 3430502 | 2008-08-04 11:59:09 -0700 | [diff] [blame] | 479 | |
| 480 | cur_idle_time = get_cpu_idle_time(j, &cur_wall_time); |
| 481 | |
venkatesh.pallipadi@intel.com | c43aa3b | 2008-08-04 11:59:08 -0700 | [diff] [blame] | 482 | wall_time = (unsigned int) cputime64_sub(cur_wall_time, |
| 483 | j_dbs_info->prev_cpu_wall); |
| 484 | j_dbs_info->prev_cpu_wall = cur_wall_time; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | |
venkatesh.pallipadi@intel.com | c43aa3b | 2008-08-04 11:59:08 -0700 | [diff] [blame] | 486 | idle_time = (unsigned int) cputime64_sub(cur_idle_time, |
| 487 | j_dbs_info->prev_cpu_idle); |
| 488 | j_dbs_info->prev_cpu_idle = cur_idle_time; |
| 489 | |
Venkatesh Pallipadi | 1ca3abd | 2009-01-23 09:25:02 -0500 | [diff] [blame] | 490 | if (dbs_tuners_ins.ignore_nice) { |
| 491 | cputime64_t cur_nice; |
| 492 | unsigned long cur_nice_jiffies; |
| 493 | |
| 494 | cur_nice = cputime64_sub(kstat_cpu(j).cpustat.nice, |
| 495 | j_dbs_info->prev_cpu_nice); |
| 496 | /* |
| 497 | * Assumption: nice time between sampling periods will |
| 498 | * be less than 2^32 jiffies for 32 bit sys |
| 499 | */ |
| 500 | cur_nice_jiffies = (unsigned long) |
| 501 | cputime64_to_jiffies64(cur_nice); |
| 502 | |
| 503 | j_dbs_info->prev_cpu_nice = kstat_cpu(j).cpustat.nice; |
| 504 | idle_time += jiffies_to_usecs(cur_nice_jiffies); |
| 505 | } |
| 506 | |
venkatesh.pallipadi@intel.com | 3430502 | 2008-08-04 11:59:09 -0700 | [diff] [blame] | 507 | if (unlikely(!wall_time || wall_time < idle_time)) |
venkatesh.pallipadi@intel.com | c43aa3b | 2008-08-04 11:59:08 -0700 | [diff] [blame] | 508 | continue; |
venkatesh.pallipadi@intel.com | c43aa3b | 2008-08-04 11:59:08 -0700 | [diff] [blame] | 509 | |
| 510 | load = 100 * (wall_time - idle_time) / wall_time; |
| 511 | |
| 512 | freq_avg = __cpufreq_driver_getavg(policy, j); |
| 513 | if (freq_avg <= 0) |
| 514 | freq_avg = policy->cur; |
| 515 | |
| 516 | load_freq = load * freq_avg; |
| 517 | if (load_freq > max_load_freq) |
| 518 | max_load_freq = load_freq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | } |
| 520 | |
Venkatesh Pallipadi | ccb2fe2 | 2006-06-28 13:49:52 -0700 | [diff] [blame] | 521 | /* Check for frequency increase */ |
venkatesh.pallipadi@intel.com | c43aa3b | 2008-08-04 11:59:08 -0700 | [diff] [blame] | 522 | if (max_load_freq > dbs_tuners_ins.up_threshold * policy->cur) { |
Dave Jones | c11420a | 2005-05-31 19:03:48 -0700 | [diff] [blame] | 523 | /* if we are already at full speed then break out early */ |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 524 | if (!dbs_tuners_ins.powersave_bias) { |
| 525 | if (policy->cur == policy->max) |
| 526 | return; |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 527 | |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 528 | __cpufreq_driver_target(policy, policy->max, |
| 529 | CPUFREQ_RELATION_H); |
| 530 | } else { |
| 531 | int freq = powersave_bias_target(policy, policy->max, |
| 532 | CPUFREQ_RELATION_H); |
| 533 | __cpufreq_driver_target(policy, freq, |
| 534 | CPUFREQ_RELATION_L); |
| 535 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | return; |
| 537 | } |
| 538 | |
| 539 | /* Check for frequency decrease */ |
Dave Jones | c29f140 | 2005-05-31 19:03:50 -0700 | [diff] [blame] | 540 | /* if we cannot reduce the frequency anymore, break out early */ |
| 541 | if (policy->cur == policy->min) |
| 542 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | |
Dave Jones | c29f140 | 2005-05-31 19:03:50 -0700 | [diff] [blame] | 544 | /* |
| 545 | * The optimal frequency is the frequency that is the lowest that |
| 546 | * can support the current CPU usage without triggering the up |
| 547 | * policy. To be safe, we focus 10 points under the threshold. |
| 548 | */ |
venkatesh.pallipadi@intel.com | e9d95bf | 2008-08-04 11:59:10 -0700 | [diff] [blame] | 549 | if (max_load_freq < |
| 550 | (dbs_tuners_ins.up_threshold - dbs_tuners_ins.down_differential) * |
| 551 | policy->cur) { |
venkatesh.pallipadi@intel.com | c43aa3b | 2008-08-04 11:59:08 -0700 | [diff] [blame] | 552 | unsigned int freq_next; |
venkatesh.pallipadi@intel.com | e9d95bf | 2008-08-04 11:59:10 -0700 | [diff] [blame] | 553 | freq_next = max_load_freq / |
| 554 | (dbs_tuners_ins.up_threshold - |
| 555 | dbs_tuners_ins.down_differential); |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 556 | |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 557 | if (!dbs_tuners_ins.powersave_bias) { |
| 558 | __cpufreq_driver_target(policy, freq_next, |
| 559 | CPUFREQ_RELATION_L); |
| 560 | } else { |
| 561 | int freq = powersave_bias_target(policy, freq_next, |
| 562 | CPUFREQ_RELATION_L); |
| 563 | __cpufreq_driver_target(policy, freq, |
| 564 | CPUFREQ_RELATION_L); |
| 565 | } |
Venkatesh Pallipadi | ccb2fe2 | 2006-06-28 13:49:52 -0700 | [diff] [blame] | 566 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | } |
| 568 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 569 | static void do_dbs_timer(struct work_struct *work) |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 570 | { |
Venkatesh Pallipadi | 529af7a | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 571 | struct cpu_dbs_info_s *dbs_info = |
| 572 | container_of(work, struct cpu_dbs_info_s, work.work); |
| 573 | unsigned int cpu = dbs_info->cpu; |
| 574 | int sample_type = dbs_info->sample_type; |
| 575 | |
Alexey Starikovskiy | 1ce28d6 | 2006-07-31 22:25:20 +0400 | [diff] [blame] | 576 | /* We want all CPUs to do sampling nearly on same jiffy */ |
| 577 | int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate); |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 578 | |
Alexey Starikovskiy | 1ce28d6 | 2006-07-31 22:25:20 +0400 | [diff] [blame] | 579 | delay -= jiffies % delay; |
venkatesh.pallipadi@intel.com | 5a75c82 | 2009-07-02 17:08:32 -0700 | [diff] [blame] | 580 | mutex_lock(&dbs_info->timer_mutex); |
Venkatesh Pallipadi | 56463b7 | 2007-02-05 16:12:45 -0800 | [diff] [blame] | 581 | |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 582 | /* Common NORMAL_SAMPLE setup */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 583 | dbs_info->sample_type = DBS_NORMAL_SAMPLE; |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 584 | if (!dbs_tuners_ins.powersave_bias || |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 585 | sample_type == DBS_NORMAL_SAMPLE) { |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 586 | dbs_check_cpu(dbs_info); |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 587 | if (dbs_info->freq_lo) { |
| 588 | /* Setup timer for SUB_SAMPLE */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 589 | dbs_info->sample_type = DBS_SUB_SAMPLE; |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 590 | delay = dbs_info->freq_hi_jiffies; |
| 591 | } |
| 592 | } else { |
| 593 | __cpufreq_driver_target(dbs_info->cur_policy, |
Dave Jones | 2b03f89 | 2009-01-18 01:43:44 -0500 | [diff] [blame] | 594 | dbs_info->freq_lo, CPUFREQ_RELATION_H); |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 595 | } |
Alexey Starikovskiy | 1ce28d6 | 2006-07-31 22:25:20 +0400 | [diff] [blame] | 596 | queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work, delay); |
venkatesh.pallipadi@intel.com | 5a75c82 | 2009-07-02 17:08:32 -0700 | [diff] [blame] | 597 | mutex_unlock(&dbs_info->timer_mutex); |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 598 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | |
Venkatesh Pallipadi | 529af7a | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 600 | static inline void dbs_timer_init(struct cpu_dbs_info_s *dbs_info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | { |
Alexey Starikovskiy | 1ce28d6 | 2006-07-31 22:25:20 +0400 | [diff] [blame] | 602 | /* We want all CPUs to do sampling nearly on same jiffy */ |
| 603 | int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate); |
| 604 | delay -= jiffies % delay; |
Venkatesh Pallipadi | 2f8a835 | 2006-06-28 13:51:19 -0700 | [diff] [blame] | 605 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 606 | dbs_info->sample_type = DBS_NORMAL_SAMPLE; |
Venki Pallipadi | 2828703 | 2007-05-08 00:27:47 -0700 | [diff] [blame] | 607 | INIT_DELAYED_WORK_DEFERRABLE(&dbs_info->work, do_dbs_timer); |
Venkatesh Pallipadi | 529af7a | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 608 | queue_delayed_work_on(dbs_info->cpu, kondemand_wq, &dbs_info->work, |
Dave Jones | 2b03f89 | 2009-01-18 01:43:44 -0500 | [diff] [blame] | 609 | delay); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | } |
| 611 | |
Linus Torvalds | 2cd7cbd | 2006-07-23 12:05:00 -0700 | [diff] [blame] | 612 | static inline void dbs_timer_exit(struct cpu_dbs_info_s *dbs_info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | { |
Mathieu Desnoyers | b14893a | 2009-05-17 10:30:45 -0400 | [diff] [blame] | 614 | cancel_delayed_work_sync(&dbs_info->work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | } |
| 616 | |
| 617 | static int cpufreq_governor_dbs(struct cpufreq_policy *policy, |
| 618 | unsigned int event) |
| 619 | { |
| 620 | unsigned int cpu = policy->cpu; |
| 621 | struct cpu_dbs_info_s *this_dbs_info; |
| 622 | unsigned int j; |
Jeff Garzik | 914f7c3 | 2006-10-20 14:31:00 -0700 | [diff] [blame] | 623 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 625 | this_dbs_info = &per_cpu(od_cpu_dbs_info, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | |
| 627 | switch (event) { |
| 628 | case CPUFREQ_GOV_START: |
Venkatesh Pallipadi | ffac80e | 2006-06-28 13:52:18 -0700 | [diff] [blame] | 629 | if ((!cpu_online(cpu)) || (!policy->cur)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | return -EINVAL; |
| 631 | |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 632 | mutex_lock(&dbs_mutex); |
Jeff Garzik | 914f7c3 | 2006-10-20 14:31:00 -0700 | [diff] [blame] | 633 | |
Thomas Renninger | 0e625ac | 2009-07-24 15:25:06 +0200 | [diff] [blame] | 634 | rc = sysfs_create_group(&policy->kobj, &dbs_attr_group_old); |
Jeff Garzik | 914f7c3 | 2006-10-20 14:31:00 -0700 | [diff] [blame] | 635 | if (rc) { |
Jeff Garzik | 914f7c3 | 2006-10-20 14:31:00 -0700 | [diff] [blame] | 636 | mutex_unlock(&dbs_mutex); |
| 637 | return rc; |
| 638 | } |
| 639 | |
venkatesh.pallipadi@intel.com | 5a75c82 | 2009-07-02 17:08:32 -0700 | [diff] [blame] | 640 | dbs_enable++; |
Rusty Russell | 835481d | 2009-01-04 05:18:06 -0800 | [diff] [blame] | 641 | for_each_cpu(j, policy->cpus) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | struct cpu_dbs_info_s *j_dbs_info; |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 643 | j_dbs_info = &per_cpu(od_cpu_dbs_info, j); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | j_dbs_info->cur_policy = policy; |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 645 | |
venkatesh.pallipadi@intel.com | 3430502 | 2008-08-04 11:59:09 -0700 | [diff] [blame] | 646 | j_dbs_info->prev_cpu_idle = get_cpu_idle_time(j, |
| 647 | &j_dbs_info->prev_cpu_wall); |
Venkatesh Pallipadi | 1ca3abd | 2009-01-23 09:25:02 -0500 | [diff] [blame] | 648 | if (dbs_tuners_ins.ignore_nice) { |
| 649 | j_dbs_info->prev_cpu_nice = |
| 650 | kstat_cpu(j).cpustat.nice; |
| 651 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | } |
Venkatesh Pallipadi | 529af7a | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 653 | this_dbs_info->cpu = cpu; |
venkatesh.pallipadi@intel.com | 5a75c82 | 2009-07-02 17:08:32 -0700 | [diff] [blame] | 654 | ondemand_powersave_bias_init_cpu(cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | /* |
| 656 | * Start the timerschedule work, when this governor |
| 657 | * is used for first time |
| 658 | */ |
| 659 | if (dbs_enable == 1) { |
| 660 | unsigned int latency; |
Thomas Renninger | 0e625ac | 2009-07-24 15:25:06 +0200 | [diff] [blame] | 661 | |
| 662 | rc = sysfs_create_group(cpufreq_global_kobject, |
| 663 | &dbs_attr_group); |
| 664 | if (rc) { |
| 665 | mutex_unlock(&dbs_mutex); |
| 666 | return rc; |
| 667 | } |
| 668 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | /* policy latency is in nS. Convert it to uS first */ |
Dave Jones | df8b59b | 2005-09-20 12:39:35 -0700 | [diff] [blame] | 670 | latency = policy->cpuinfo.transition_latency / 1000; |
| 671 | if (latency == 0) |
| 672 | latency = 1; |
Thomas Renninger | cef9615 | 2009-04-22 13:48:29 +0200 | [diff] [blame] | 673 | /* Bring kernel and HW constraints together */ |
| 674 | min_sampling_rate = max(min_sampling_rate, |
| 675 | MIN_LATENCY_MULTIPLIER * latency); |
| 676 | dbs_tuners_ins.sampling_rate = |
| 677 | max(min_sampling_rate, |
| 678 | latency * LATENCY_MULTIPLIER); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | } |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 680 | mutex_unlock(&dbs_mutex); |
venkatesh.pallipadi@intel.com | 7d26e2d | 2009-07-02 17:08:30 -0700 | [diff] [blame] | 681 | |
Thomas Renninger | 0e625ac | 2009-07-24 15:25:06 +0200 | [diff] [blame] | 682 | mutex_init(&this_dbs_info->timer_mutex); |
venkatesh.pallipadi@intel.com | 7d26e2d | 2009-07-02 17:08:30 -0700 | [diff] [blame] | 683 | dbs_timer_init(this_dbs_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | break; |
| 685 | |
| 686 | case CPUFREQ_GOV_STOP: |
Linus Torvalds | 2cd7cbd | 2006-07-23 12:05:00 -0700 | [diff] [blame] | 687 | dbs_timer_exit(this_dbs_info); |
venkatesh.pallipadi@intel.com | 7d26e2d | 2009-07-02 17:08:30 -0700 | [diff] [blame] | 688 | |
| 689 | mutex_lock(&dbs_mutex); |
Thomas Renninger | 0e625ac | 2009-07-24 15:25:06 +0200 | [diff] [blame] | 690 | sysfs_remove_group(&policy->kobj, &dbs_attr_group_old); |
venkatesh.pallipadi@intel.com | 5a75c82 | 2009-07-02 17:08:32 -0700 | [diff] [blame] | 691 | mutex_destroy(&this_dbs_info->timer_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | dbs_enable--; |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 693 | mutex_unlock(&dbs_mutex); |
Thomas Renninger | 0e625ac | 2009-07-24 15:25:06 +0200 | [diff] [blame] | 694 | if (!dbs_enable) |
| 695 | sysfs_remove_group(cpufreq_global_kobject, |
| 696 | &dbs_attr_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | |
| 698 | break; |
| 699 | |
| 700 | case CPUFREQ_GOV_LIMITS: |
venkatesh.pallipadi@intel.com | 5a75c82 | 2009-07-02 17:08:32 -0700 | [diff] [blame] | 701 | mutex_lock(&this_dbs_info->timer_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | if (policy->max < this_dbs_info->cur_policy->cur) |
Venkatesh Pallipadi | ffac80e | 2006-06-28 13:52:18 -0700 | [diff] [blame] | 703 | __cpufreq_driver_target(this_dbs_info->cur_policy, |
Dave Jones | 2b03f89 | 2009-01-18 01:43:44 -0500 | [diff] [blame] | 704 | policy->max, CPUFREQ_RELATION_H); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | else if (policy->min > this_dbs_info->cur_policy->cur) |
Venkatesh Pallipadi | ffac80e | 2006-06-28 13:52:18 -0700 | [diff] [blame] | 706 | __cpufreq_driver_target(this_dbs_info->cur_policy, |
Dave Jones | 2b03f89 | 2009-01-18 01:43:44 -0500 | [diff] [blame] | 707 | policy->min, CPUFREQ_RELATION_L); |
venkatesh.pallipadi@intel.com | 5a75c82 | 2009-07-02 17:08:32 -0700 | [diff] [blame] | 708 | mutex_unlock(&this_dbs_info->timer_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | break; |
| 710 | } |
| 711 | return 0; |
| 712 | } |
| 713 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | static int __init cpufreq_gov_dbs_init(void) |
| 715 | { |
Akinobu Mita | 888a794 | 2008-07-14 12:00:45 +0900 | [diff] [blame] | 716 | int err; |
venkatesh.pallipadi@intel.com | 8080091 | 2008-08-04 11:59:12 -0700 | [diff] [blame] | 717 | cputime64_t wall; |
Andrea Righi | 4f6e6b9 | 2008-09-18 10:43:40 +0000 | [diff] [blame] | 718 | u64 idle_time; |
| 719 | int cpu = get_cpu(); |
venkatesh.pallipadi@intel.com | 8080091 | 2008-08-04 11:59:12 -0700 | [diff] [blame] | 720 | |
Andrea Righi | 4f6e6b9 | 2008-09-18 10:43:40 +0000 | [diff] [blame] | 721 | idle_time = get_cpu_idle_time_us(cpu, &wall); |
| 722 | put_cpu(); |
venkatesh.pallipadi@intel.com | 8080091 | 2008-08-04 11:59:12 -0700 | [diff] [blame] | 723 | if (idle_time != -1ULL) { |
| 724 | /* Idle micro accounting is supported. Use finer thresholds */ |
| 725 | dbs_tuners_ins.up_threshold = MICRO_FREQUENCY_UP_THRESHOLD; |
| 726 | dbs_tuners_ins.down_differential = |
| 727 | MICRO_FREQUENCY_DOWN_DIFFERENTIAL; |
Thomas Renninger | cef9615 | 2009-04-22 13:48:29 +0200 | [diff] [blame] | 728 | /* |
| 729 | * In no_hz/micro accounting case we set the minimum frequency |
| 730 | * not depending on HZ, but fixed (very low). The deferred |
| 731 | * timer might skip some samples if idle/sleeping as needed. |
| 732 | */ |
| 733 | min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE; |
| 734 | } else { |
| 735 | /* For correct statistics, we need 10 ticks for each measure */ |
| 736 | min_sampling_rate = |
| 737 | MIN_SAMPLING_RATE_RATIO * jiffies_to_usecs(10); |
venkatesh.pallipadi@intel.com | 8080091 | 2008-08-04 11:59:12 -0700 | [diff] [blame] | 738 | } |
Akinobu Mita | 888a794 | 2008-07-14 12:00:45 +0900 | [diff] [blame] | 739 | |
Venkatesh Pallipadi | 56463b7 | 2007-02-05 16:12:45 -0800 | [diff] [blame] | 740 | kondemand_wq = create_workqueue("kondemand"); |
| 741 | if (!kondemand_wq) { |
| 742 | printk(KERN_ERR "Creation of kondemand failed\n"); |
| 743 | return -EFAULT; |
| 744 | } |
Akinobu Mita | 888a794 | 2008-07-14 12:00:45 +0900 | [diff] [blame] | 745 | err = cpufreq_register_governor(&cpufreq_gov_ondemand); |
| 746 | if (err) |
| 747 | destroy_workqueue(kondemand_wq); |
| 748 | |
| 749 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | } |
| 751 | |
| 752 | static void __exit cpufreq_gov_dbs_exit(void) |
| 753 | { |
Thomas Renninger | 1c25624 | 2007-10-02 13:28:12 -0700 | [diff] [blame] | 754 | cpufreq_unregister_governor(&cpufreq_gov_ondemand); |
Venkatesh Pallipadi | 56463b7 | 2007-02-05 16:12:45 -0800 | [diff] [blame] | 755 | destroy_workqueue(kondemand_wq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | } |
| 757 | |
| 758 | |
Venkatesh Pallipadi | ffac80e | 2006-06-28 13:52:18 -0700 | [diff] [blame] | 759 | MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>"); |
| 760 | MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>"); |
| 761 | MODULE_DESCRIPTION("'cpufreq_ondemand' - A dynamic cpufreq governor for " |
Dave Jones | 2b03f89 | 2009-01-18 01:43:44 -0500 | [diff] [blame] | 762 | "Low Latency Frequency Transition capable processors"); |
Venkatesh Pallipadi | ffac80e | 2006-06-28 13:52:18 -0700 | [diff] [blame] | 763 | MODULE_LICENSE("GPL"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | |
Johannes Weiner | 6915719 | 2008-01-17 15:21:08 -0800 | [diff] [blame] | 765 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
| 766 | fs_initcall(cpufreq_gov_dbs_init); |
| 767 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | module_init(cpufreq_gov_dbs_init); |
Johannes Weiner | 6915719 | 2008-01-17 15:21:08 -0800 | [diff] [blame] | 769 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | module_exit(cpufreq_gov_dbs_exit); |