Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 1 | /* |
| 2 | * drivers/cpufreq/cpufreq_conservative.c |
| 3 | * |
| 4 | * Copyright (C) 2001 Russell King |
| 5 | * (C) 2003 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>. |
| 6 | * Jun Nakajima <jun.nakajima@intel.com> |
Alexander Clouter | 11a80a9c76 | 2009-02-13 19:01:01 +0000 | [diff] [blame] | 7 | * (C) 2009 Alexander Clouter <alex@digriz.org.uk> |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 2 as |
| 11 | * published by the Free Software Foundation. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/module.h> |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 16 | #include <linux/init.h> |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 17 | #include <linux/cpufreq.h> |
Andrew Morton | 138a0128 | 2006-06-23 03:31:19 -0700 | [diff] [blame] | 18 | #include <linux/cpu.h> |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 19 | #include <linux/jiffies.h> |
| 20 | #include <linux/kernel_stat.h> |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 21 | #include <linux/mutex.h> |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 22 | #include <linux/hrtimer.h> |
| 23 | #include <linux/tick.h> |
| 24 | #include <linux/ktime.h> |
| 25 | #include <linux/sched.h> |
| 26 | |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 27 | /* |
| 28 | * dbs is used in this file as a shortform for demandbased switching |
| 29 | * It helps to keep variable names smaller, simpler |
| 30 | */ |
| 31 | |
| 32 | #define DEF_FREQUENCY_UP_THRESHOLD (80) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 33 | #define DEF_FREQUENCY_DOWN_THRESHOLD (20) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 34 | |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 35 | /* |
| 36 | * The polling frequency of this governor depends on the capability of |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 37 | * the processor. Default polling frequency is 1000 times the transition |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 38 | * latency of the processor. The governor will work on any processor with |
| 39 | * transition latency <= 10mS, using appropriate sampling |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 40 | * rate. |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 41 | * For CPUs with transition latency > 10mS (mostly drivers with CPUFREQ_ETERNAL) |
| 42 | * this governor will not work. |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 43 | * All times here are in uS. |
| 44 | */ |
Alexander Clouter | 2c906b3 | 2006-03-22 09:54:10 +0000 | [diff] [blame] | 45 | #define MIN_SAMPLING_RATE_RATIO (2) |
Thomas Renninger | 112124a | 2009-02-04 11:55:12 +0100 | [diff] [blame] | 46 | |
Thomas Renninger | cef9615 | 2009-04-22 13:48:29 +0200 | [diff] [blame] | 47 | static unsigned int min_sampling_rate; |
| 48 | |
Thomas Renninger | 112124a | 2009-02-04 11:55:12 +0100 | [diff] [blame] | 49 | #define LATENCY_MULTIPLIER (1000) |
Thomas Renninger | cef9615 | 2009-04-22 13:48:29 +0200 | [diff] [blame] | 50 | #define MIN_LATENCY_MULTIPLIER (100) |
Alexander Clouter | 2c906b3 | 2006-03-22 09:54:10 +0000 | [diff] [blame] | 51 | #define DEF_SAMPLING_DOWN_FACTOR (1) |
| 52 | #define MAX_SAMPLING_DOWN_FACTOR (10) |
Thomas Renninger | 1c25624 | 2007-10-02 13:28:12 -0700 | [diff] [blame] | 53 | #define TRANSITION_LATENCY_LIMIT (10 * 1000 * 1000) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 54 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 55 | static void do_dbs_timer(struct work_struct *work); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 56 | |
| 57 | struct cpu_dbs_info_s { |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 58 | cputime64_t prev_cpu_idle; |
| 59 | cputime64_t prev_cpu_wall; |
| 60 | cputime64_t prev_cpu_nice; |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 61 | struct cpufreq_policy *cur_policy; |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 62 | struct delayed_work work; |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 63 | unsigned int down_skip; |
| 64 | unsigned int requested_freq; |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 65 | int cpu; |
| 66 | unsigned int enable:1; |
venkatesh.pallipadi@intel.com | ee88415 | 2009-07-02 17:08:33 -0700 | [diff] [blame] | 67 | /* |
| 68 | * percpu mutex that serializes governor limit change with |
| 69 | * do_dbs_timer invocation. We do not want do_dbs_timer to run |
| 70 | * when user is changing the governor or limits. |
| 71 | */ |
| 72 | struct mutex timer_mutex; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 73 | }; |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 74 | static DEFINE_PER_CPU(struct cpu_dbs_info_s, cs_cpu_dbs_info); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 75 | |
| 76 | static unsigned int dbs_enable; /* number of CPUs using this policy */ |
| 77 | |
Venkatesh Pallipadi | 4ec223d | 2006-06-21 15:18:34 -0700 | [diff] [blame] | 78 | /* |
venkatesh.pallipadi@intel.com | 7d26e2d | 2009-07-02 17:08:30 -0700 | [diff] [blame] | 79 | * dbs_mutex protects data in dbs_tuners_ins from concurrent changes on |
venkatesh.pallipadi@intel.com | ee88415 | 2009-07-02 17:08:33 -0700 | [diff] [blame] | 80 | * different CPUs. It protects dbs_enable in governor start/stop. |
Venkatesh Pallipadi | 4ec223d | 2006-06-21 15:18:34 -0700 | [diff] [blame] | 81 | */ |
Dave Jones | 9acef48 | 2009-01-18 01:39:51 -0500 | [diff] [blame] | 82 | static DEFINE_MUTEX(dbs_mutex); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 83 | |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 84 | static struct workqueue_struct *kconservative_wq; |
| 85 | |
| 86 | static struct dbs_tuners { |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 87 | unsigned int sampling_rate; |
| 88 | unsigned int sampling_down_factor; |
| 89 | unsigned int up_threshold; |
| 90 | unsigned int down_threshold; |
| 91 | unsigned int ignore_nice; |
| 92 | unsigned int freq_step; |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 93 | } dbs_tuners_ins = { |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 94 | .up_threshold = DEF_FREQUENCY_UP_THRESHOLD, |
| 95 | .down_threshold = DEF_FREQUENCY_DOWN_THRESHOLD, |
| 96 | .sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR, |
| 97 | .ignore_nice = 0, |
| 98 | .freq_step = 5, |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 99 | }; |
| 100 | |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 101 | static inline cputime64_t get_cpu_idle_time_jiffy(unsigned int cpu, |
| 102 | cputime64_t *wall) |
Dave Jones | dac1c1a | 2005-05-31 19:03:49 -0700 | [diff] [blame] | 103 | { |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 104 | cputime64_t idle_time; |
| 105 | cputime64_t cur_wall_time; |
| 106 | cputime64_t busy_time; |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 107 | |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 108 | cur_wall_time = jiffies64_to_cputime64(get_jiffies_64()); |
| 109 | busy_time = cputime64_add(kstat_cpu(cpu).cpustat.user, |
| 110 | kstat_cpu(cpu).cpustat.system); |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 111 | |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 112 | busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.irq); |
| 113 | busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.softirq); |
| 114 | busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.steal); |
| 115 | busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.nice); |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 116 | |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 117 | idle_time = cputime64_sub(cur_wall_time, busy_time); |
| 118 | if (wall) |
Pallipadi, Venkatesh | 54c9a35 | 2009-11-11 16:50:29 -0800 | [diff] [blame] | 119 | *wall = (cputime64_t)jiffies_to_usecs(cur_wall_time); |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 120 | |
Pallipadi, Venkatesh | 54c9a35 | 2009-11-11 16:50:29 -0800 | [diff] [blame] | 121 | return (cputime64_t)jiffies_to_usecs(idle_time);; |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 122 | } |
| 123 | |
| 124 | static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall) |
| 125 | { |
| 126 | u64 idle_time = get_cpu_idle_time_us(cpu, wall); |
| 127 | |
| 128 | if (idle_time == -1ULL) |
| 129 | return get_cpu_idle_time_jiffy(cpu, wall); |
| 130 | |
| 131 | return idle_time; |
Dave Jones | dac1c1a | 2005-05-31 19:03:49 -0700 | [diff] [blame] | 132 | } |
| 133 | |
Elias Oltmanns | a8d7c3b | 2007-10-22 09:50:13 +0200 | [diff] [blame] | 134 | /* keep track of frequency transitions */ |
| 135 | static int |
| 136 | dbs_cpufreq_notifier(struct notifier_block *nb, unsigned long val, |
| 137 | void *data) |
| 138 | { |
| 139 | struct cpufreq_freqs *freq = data; |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 140 | struct cpu_dbs_info_s *this_dbs_info = &per_cpu(cs_cpu_dbs_info, |
Elias Oltmanns | a8d7c3b | 2007-10-22 09:50:13 +0200 | [diff] [blame] | 141 | freq->cpu); |
| 142 | |
Alexander Clouter | f407a08 | 2009-02-13 19:01:51 +0000 | [diff] [blame] | 143 | struct cpufreq_policy *policy; |
| 144 | |
Elias Oltmanns | a8d7c3b | 2007-10-22 09:50:13 +0200 | [diff] [blame] | 145 | if (!this_dbs_info->enable) |
| 146 | return 0; |
| 147 | |
Alexander Clouter | f407a08 | 2009-02-13 19:01:51 +0000 | [diff] [blame] | 148 | policy = this_dbs_info->cur_policy; |
| 149 | |
| 150 | /* |
| 151 | * we only care if our internally tracked freq moves outside |
| 152 | * the 'valid' ranges of freqency available to us otherwise |
| 153 | * we do not change it |
| 154 | */ |
| 155 | if (this_dbs_info->requested_freq > policy->max |
| 156 | || this_dbs_info->requested_freq < policy->min) |
| 157 | this_dbs_info->requested_freq = freq->new; |
Elias Oltmanns | a8d7c3b | 2007-10-22 09:50:13 +0200 | [diff] [blame] | 158 | |
| 159 | return 0; |
| 160 | } |
| 161 | |
| 162 | static struct notifier_block dbs_cpufreq_notifier_block = { |
| 163 | .notifier_call = dbs_cpufreq_notifier |
| 164 | }; |
| 165 | |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 166 | /************************** sysfs interface ************************/ |
Thomas Renninger | 49b015c | 2009-10-01 19:49:28 +0200 | [diff] [blame] | 167 | static ssize_t show_sampling_rate_max(struct kobject *kobj, |
| 168 | struct attribute *attr, char *buf) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 169 | { |
Thomas Renninger | 4f4d1ad | 2009-04-22 13:48:31 +0200 | [diff] [blame] | 170 | printk_once(KERN_INFO "CPUFREQ: conservative sampling_rate_max " |
| 171 | "sysfs file is deprecated - used by: %s\n", current->comm); |
Thomas Renninger | cef9615 | 2009-04-22 13:48:29 +0200 | [diff] [blame] | 172 | return sprintf(buf, "%u\n", -1U); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 173 | } |
| 174 | |
Thomas Renninger | 49b015c | 2009-10-01 19:49:28 +0200 | [diff] [blame] | 175 | static ssize_t show_sampling_rate_min(struct kobject *kobj, |
| 176 | struct attribute *attr, char *buf) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 177 | { |
Thomas Renninger | cef9615 | 2009-04-22 13:48:29 +0200 | [diff] [blame] | 178 | return sprintf(buf, "%u\n", min_sampling_rate); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 179 | } |
| 180 | |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 181 | #define define_one_ro(_name) \ |
Thomas Renninger | 49b015c | 2009-10-01 19:49:28 +0200 | [diff] [blame] | 182 | static struct global_attr _name = \ |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 183 | __ATTR(_name, 0444, show_##_name, NULL) |
| 184 | |
| 185 | define_one_ro(sampling_rate_max); |
| 186 | define_one_ro(sampling_rate_min); |
| 187 | |
| 188 | /* cpufreq_conservative Governor Tunables */ |
| 189 | #define show_one(file_name, object) \ |
| 190 | static ssize_t show_##file_name \ |
Thomas Renninger | 49b015c | 2009-10-01 19:49:28 +0200 | [diff] [blame] | 191 | (struct kobject *kobj, struct attribute *attr, char *buf) \ |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 192 | { \ |
| 193 | return sprintf(buf, "%u\n", dbs_tuners_ins.object); \ |
| 194 | } |
| 195 | show_one(sampling_rate, sampling_rate); |
| 196 | show_one(sampling_down_factor, sampling_down_factor); |
| 197 | show_one(up_threshold, up_threshold); |
| 198 | show_one(down_threshold, down_threshold); |
Alexander Clouter | 001893c | 2005-12-01 01:09:25 -0800 | [diff] [blame] | 199 | show_one(ignore_nice_load, ignore_nice); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 200 | show_one(freq_step, freq_step); |
| 201 | |
Thomas Renninger | 49b015c | 2009-10-01 19:49:28 +0200 | [diff] [blame] | 202 | /*** delete after deprecation time ***/ |
| 203 | #define DEPRECATION_MSG(file_name) \ |
| 204 | printk_once(KERN_INFO "CPUFREQ: Per core conservative sysfs " \ |
| 205 | "interface is deprecated - " #file_name "\n"); |
| 206 | |
| 207 | #define show_one_old(file_name) \ |
| 208 | static ssize_t show_##file_name##_old \ |
| 209 | (struct cpufreq_policy *unused, char *buf) \ |
| 210 | { \ |
| 211 | printk_once(KERN_INFO "CPUFREQ: Per core conservative sysfs " \ |
| 212 | "interface is deprecated - " #file_name "\n"); \ |
| 213 | return show_##file_name(NULL, NULL, buf); \ |
| 214 | } |
| 215 | show_one_old(sampling_rate); |
| 216 | show_one_old(sampling_down_factor); |
| 217 | show_one_old(up_threshold); |
| 218 | show_one_old(down_threshold); |
| 219 | show_one_old(ignore_nice_load); |
| 220 | show_one_old(freq_step); |
| 221 | show_one_old(sampling_rate_min); |
| 222 | show_one_old(sampling_rate_max); |
| 223 | |
| 224 | #define define_one_ro_old(object, _name) \ |
| 225 | static struct freq_attr object = \ |
| 226 | __ATTR(_name, 0444, show_##_name##_old, NULL) |
| 227 | |
| 228 | define_one_ro_old(sampling_rate_min_old, sampling_rate_min); |
| 229 | define_one_ro_old(sampling_rate_max_old, sampling_rate_max); |
| 230 | |
| 231 | /*** delete after deprecation time ***/ |
| 232 | |
| 233 | static ssize_t store_sampling_down_factor(struct kobject *a, |
| 234 | struct attribute *b, |
| 235 | const char *buf, size_t count) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 236 | { |
| 237 | unsigned int input; |
| 238 | int ret; |
Dave Jones | 9acef48 | 2009-01-18 01:39:51 -0500 | [diff] [blame] | 239 | ret = sscanf(buf, "%u", &input); |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 240 | |
Alexander Clouter | 2c906b3 | 2006-03-22 09:54:10 +0000 | [diff] [blame] | 241 | if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 242 | return -EINVAL; |
| 243 | |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 244 | mutex_lock(&dbs_mutex); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 245 | dbs_tuners_ins.sampling_down_factor = input; |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 246 | mutex_unlock(&dbs_mutex); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 247 | |
| 248 | return count; |
| 249 | } |
| 250 | |
Thomas Renninger | 49b015c | 2009-10-01 19:49:28 +0200 | [diff] [blame] | 251 | static ssize_t store_sampling_rate(struct kobject *a, struct attribute *b, |
| 252 | const char *buf, size_t count) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 253 | { |
| 254 | unsigned int input; |
| 255 | int ret; |
Dave Jones | 9acef48 | 2009-01-18 01:39:51 -0500 | [diff] [blame] | 256 | ret = sscanf(buf, "%u", &input); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 257 | |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 258 | if (ret != 1) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 259 | return -EINVAL; |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 260 | |
| 261 | mutex_lock(&dbs_mutex); |
Thomas Renninger | cef9615 | 2009-04-22 13:48:29 +0200 | [diff] [blame] | 262 | dbs_tuners_ins.sampling_rate = max(input, min_sampling_rate); |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 263 | mutex_unlock(&dbs_mutex); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 264 | |
| 265 | return count; |
| 266 | } |
| 267 | |
Thomas Renninger | 49b015c | 2009-10-01 19:49:28 +0200 | [diff] [blame] | 268 | static ssize_t store_up_threshold(struct kobject *a, struct attribute *b, |
| 269 | const char *buf, size_t count) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 270 | { |
| 271 | unsigned int input; |
| 272 | int ret; |
Dave Jones | 9acef48 | 2009-01-18 01:39:51 -0500 | [diff] [blame] | 273 | ret = sscanf(buf, "%u", &input); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 274 | |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 275 | mutex_lock(&dbs_mutex); |
Dave Jones | 9acef48 | 2009-01-18 01:39:51 -0500 | [diff] [blame] | 276 | if (ret != 1 || input > 100 || |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 277 | input <= dbs_tuners_ins.down_threshold) { |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 278 | mutex_unlock(&dbs_mutex); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 279 | return -EINVAL; |
| 280 | } |
| 281 | |
| 282 | dbs_tuners_ins.up_threshold = input; |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 283 | mutex_unlock(&dbs_mutex); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 284 | |
| 285 | return count; |
| 286 | } |
| 287 | |
Thomas Renninger | 49b015c | 2009-10-01 19:49:28 +0200 | [diff] [blame] | 288 | static ssize_t store_down_threshold(struct kobject *a, struct attribute *b, |
| 289 | const char *buf, size_t count) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 290 | { |
| 291 | unsigned int input; |
| 292 | int ret; |
Dave Jones | 9acef48 | 2009-01-18 01:39:51 -0500 | [diff] [blame] | 293 | ret = sscanf(buf, "%u", &input); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 294 | |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 295 | mutex_lock(&dbs_mutex); |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 296 | /* cannot be lower than 11 otherwise freq will not fall */ |
| 297 | if (ret != 1 || input < 11 || input > 100 || |
| 298 | input >= dbs_tuners_ins.up_threshold) { |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 299 | mutex_unlock(&dbs_mutex); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 300 | return -EINVAL; |
| 301 | } |
| 302 | |
| 303 | dbs_tuners_ins.down_threshold = input; |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 304 | mutex_unlock(&dbs_mutex); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 305 | |
| 306 | return count; |
| 307 | } |
| 308 | |
Thomas Renninger | 49b015c | 2009-10-01 19:49:28 +0200 | [diff] [blame] | 309 | static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b, |
| 310 | const char *buf, size_t count) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 311 | { |
| 312 | unsigned int input; |
| 313 | int ret; |
| 314 | |
| 315 | unsigned int j; |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 316 | |
| 317 | ret = sscanf(buf, "%u", &input); |
| 318 | if (ret != 1) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 319 | return -EINVAL; |
| 320 | |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 321 | if (input > 1) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 322 | input = 1; |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 323 | |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 324 | mutex_lock(&dbs_mutex); |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 325 | if (input == dbs_tuners_ins.ignore_nice) { /* nothing to do */ |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 326 | mutex_unlock(&dbs_mutex); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 327 | return count; |
| 328 | } |
| 329 | dbs_tuners_ins.ignore_nice = input; |
| 330 | |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 331 | /* we need to re-evaluate prev_cpu_idle */ |
Dave Jones | dac1c1a | 2005-05-31 19:03:49 -0700 | [diff] [blame] | 332 | for_each_online_cpu(j) { |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 333 | struct cpu_dbs_info_s *dbs_info; |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 334 | dbs_info = &per_cpu(cs_cpu_dbs_info, j); |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 335 | dbs_info->prev_cpu_idle = get_cpu_idle_time(j, |
| 336 | &dbs_info->prev_cpu_wall); |
| 337 | if (dbs_tuners_ins.ignore_nice) |
| 338 | dbs_info->prev_cpu_nice = kstat_cpu(j).cpustat.nice; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 339 | } |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 340 | mutex_unlock(&dbs_mutex); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 341 | |
| 342 | return count; |
| 343 | } |
| 344 | |
Thomas Renninger | 49b015c | 2009-10-01 19:49:28 +0200 | [diff] [blame] | 345 | static ssize_t store_freq_step(struct kobject *a, struct attribute *b, |
| 346 | const char *buf, size_t count) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 347 | { |
| 348 | unsigned int input; |
| 349 | int ret; |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 350 | ret = sscanf(buf, "%u", &input); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 351 | |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 352 | if (ret != 1) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 353 | return -EINVAL; |
| 354 | |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 355 | if (input > 100) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 356 | input = 100; |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 357 | |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 358 | /* no need to test here if freq_step is zero as the user might actually |
| 359 | * want this, they would be crazy though :) */ |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 360 | mutex_lock(&dbs_mutex); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 361 | dbs_tuners_ins.freq_step = input; |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 362 | mutex_unlock(&dbs_mutex); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 363 | |
| 364 | return count; |
| 365 | } |
| 366 | |
| 367 | #define define_one_rw(_name) \ |
Thomas Renninger | 49b015c | 2009-10-01 19:49:28 +0200 | [diff] [blame] | 368 | static struct global_attr _name = \ |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 369 | __ATTR(_name, 0644, show_##_name, store_##_name) |
| 370 | |
| 371 | define_one_rw(sampling_rate); |
| 372 | define_one_rw(sampling_down_factor); |
| 373 | define_one_rw(up_threshold); |
| 374 | define_one_rw(down_threshold); |
Alexander Clouter | 001893c | 2005-12-01 01:09:25 -0800 | [diff] [blame] | 375 | define_one_rw(ignore_nice_load); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 376 | define_one_rw(freq_step); |
| 377 | |
Dave Jones | 9acef48 | 2009-01-18 01:39:51 -0500 | [diff] [blame] | 378 | static struct attribute *dbs_attributes[] = { |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 379 | &sampling_rate_max.attr, |
| 380 | &sampling_rate_min.attr, |
| 381 | &sampling_rate.attr, |
| 382 | &sampling_down_factor.attr, |
| 383 | &up_threshold.attr, |
| 384 | &down_threshold.attr, |
Alexander Clouter | 001893c | 2005-12-01 01:09:25 -0800 | [diff] [blame] | 385 | &ignore_nice_load.attr, |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 386 | &freq_step.attr, |
| 387 | NULL |
| 388 | }; |
| 389 | |
| 390 | static struct attribute_group dbs_attr_group = { |
| 391 | .attrs = dbs_attributes, |
| 392 | .name = "conservative", |
| 393 | }; |
| 394 | |
Thomas Renninger | 49b015c | 2009-10-01 19:49:28 +0200 | [diff] [blame] | 395 | /*** delete after deprecation time ***/ |
| 396 | |
| 397 | #define write_one_old(file_name) \ |
| 398 | static ssize_t store_##file_name##_old \ |
| 399 | (struct cpufreq_policy *unused, const char *buf, size_t count) \ |
| 400 | { \ |
| 401 | printk_once(KERN_INFO "CPUFREQ: Per core conservative sysfs " \ |
| 402 | "interface is deprecated - " #file_name "\n"); \ |
| 403 | return store_##file_name(NULL, NULL, buf, count); \ |
| 404 | } |
| 405 | write_one_old(sampling_rate); |
| 406 | write_one_old(sampling_down_factor); |
| 407 | write_one_old(up_threshold); |
| 408 | write_one_old(down_threshold); |
| 409 | write_one_old(ignore_nice_load); |
| 410 | write_one_old(freq_step); |
| 411 | |
| 412 | #define define_one_rw_old(object, _name) \ |
| 413 | static struct freq_attr object = \ |
| 414 | __ATTR(_name, 0644, show_##_name##_old, store_##_name##_old) |
| 415 | |
| 416 | define_one_rw_old(sampling_rate_old, sampling_rate); |
| 417 | define_one_rw_old(sampling_down_factor_old, sampling_down_factor); |
| 418 | define_one_rw_old(up_threshold_old, up_threshold); |
| 419 | define_one_rw_old(down_threshold_old, down_threshold); |
| 420 | define_one_rw_old(ignore_nice_load_old, ignore_nice_load); |
| 421 | define_one_rw_old(freq_step_old, freq_step); |
| 422 | |
| 423 | static struct attribute *dbs_attributes_old[] = { |
| 424 | &sampling_rate_max_old.attr, |
| 425 | &sampling_rate_min_old.attr, |
| 426 | &sampling_rate_old.attr, |
| 427 | &sampling_down_factor_old.attr, |
| 428 | &up_threshold_old.attr, |
| 429 | &down_threshold_old.attr, |
| 430 | &ignore_nice_load_old.attr, |
| 431 | &freq_step_old.attr, |
| 432 | NULL |
| 433 | }; |
| 434 | |
| 435 | static struct attribute_group dbs_attr_group_old = { |
| 436 | .attrs = dbs_attributes_old, |
| 437 | .name = "conservative", |
| 438 | }; |
| 439 | |
| 440 | /*** delete after deprecation time ***/ |
| 441 | |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 442 | /************************** sysfs end ************************/ |
| 443 | |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 444 | static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 445 | { |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 446 | unsigned int load = 0; |
Dave Jones | f068c04 | 2008-07-30 12:59:56 -0400 | [diff] [blame] | 447 | unsigned int freq_target; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 448 | |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 449 | struct cpufreq_policy *policy; |
| 450 | unsigned int j; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 451 | |
Alexander Clouter | 08a28e2 | 2006-03-22 09:59:16 +0000 | [diff] [blame] | 452 | policy = this_dbs_info->cur_policy; |
| 453 | |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 454 | /* |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 455 | * Every sampling_rate, we check, if current idle time is less |
| 456 | * than 20% (default), then we try to increase frequency |
| 457 | * Every sampling_rate*sampling_down_factor, we check, if current |
| 458 | * idle time is more than 80%, then we try to decrease frequency |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 459 | * |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 460 | * Any frequency increase takes it to the maximum frequency. |
| 461 | * Frequency reduction happens at minimum steps of |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 462 | * 5% (default) of maximum frequency |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 463 | */ |
| 464 | |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 465 | /* Get Absolute Load */ |
| 466 | for_each_cpu(j, policy->cpus) { |
| 467 | struct cpu_dbs_info_s *j_dbs_info; |
| 468 | cputime64_t cur_wall_time, cur_idle_time; |
| 469 | unsigned int idle_time, wall_time; |
| 470 | |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 471 | j_dbs_info = &per_cpu(cs_cpu_dbs_info, j); |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 472 | |
| 473 | cur_idle_time = get_cpu_idle_time(j, &cur_wall_time); |
| 474 | |
| 475 | wall_time = (unsigned int) cputime64_sub(cur_wall_time, |
| 476 | j_dbs_info->prev_cpu_wall); |
| 477 | j_dbs_info->prev_cpu_wall = cur_wall_time; |
| 478 | |
| 479 | idle_time = (unsigned int) cputime64_sub(cur_idle_time, |
| 480 | j_dbs_info->prev_cpu_idle); |
| 481 | j_dbs_info->prev_cpu_idle = cur_idle_time; |
| 482 | |
| 483 | if (dbs_tuners_ins.ignore_nice) { |
| 484 | cputime64_t cur_nice; |
| 485 | unsigned long cur_nice_jiffies; |
| 486 | |
| 487 | cur_nice = cputime64_sub(kstat_cpu(j).cpustat.nice, |
| 488 | j_dbs_info->prev_cpu_nice); |
| 489 | /* |
| 490 | * Assumption: nice time between sampling periods will |
| 491 | * be less than 2^32 jiffies for 32 bit sys |
| 492 | */ |
| 493 | cur_nice_jiffies = (unsigned long) |
| 494 | cputime64_to_jiffies64(cur_nice); |
| 495 | |
| 496 | j_dbs_info->prev_cpu_nice = kstat_cpu(j).cpustat.nice; |
| 497 | idle_time += jiffies_to_usecs(cur_nice_jiffies); |
| 498 | } |
| 499 | |
| 500 | if (unlikely(!wall_time || wall_time < idle_time)) |
| 501 | continue; |
| 502 | |
| 503 | load = 100 * (wall_time - idle_time) / wall_time; |
| 504 | } |
| 505 | |
| 506 | /* |
| 507 | * break out if we 'cannot' reduce the speed as the user might |
| 508 | * want freq_step to be zero |
| 509 | */ |
| 510 | if (dbs_tuners_ins.freq_step == 0) |
| 511 | return; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 512 | |
Alexander Clouter | 08a28e2 | 2006-03-22 09:59:16 +0000 | [diff] [blame] | 513 | /* Check for frequency increase */ |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 514 | if (load > dbs_tuners_ins.up_threshold) { |
Alexander Clouter | a159b82 | 2006-03-22 10:00:18 +0000 | [diff] [blame] | 515 | this_dbs_info->down_skip = 0; |
Dave Jones | 790d76f | 2005-05-31 19:03:49 -0700 | [diff] [blame] | 516 | |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 517 | /* if we are already at full speed then break out early */ |
Alexander Clouter | a159b82 | 2006-03-22 10:00:18 +0000 | [diff] [blame] | 518 | if (this_dbs_info->requested_freq == policy->max) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 519 | return; |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 520 | |
Dave Jones | f068c04 | 2008-07-30 12:59:56 -0400 | [diff] [blame] | 521 | freq_target = (dbs_tuners_ins.freq_step * policy->max) / 100; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 522 | |
| 523 | /* max freq cannot be less than 100. But who knows.... */ |
Dave Jones | f068c04 | 2008-07-30 12:59:56 -0400 | [diff] [blame] | 524 | if (unlikely(freq_target == 0)) |
| 525 | freq_target = 5; |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 526 | |
Dave Jones | f068c04 | 2008-07-30 12:59:56 -0400 | [diff] [blame] | 527 | this_dbs_info->requested_freq += freq_target; |
Alexander Clouter | a159b82 | 2006-03-22 10:00:18 +0000 | [diff] [blame] | 528 | if (this_dbs_info->requested_freq > policy->max) |
| 529 | this_dbs_info->requested_freq = policy->max; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 530 | |
Alexander Clouter | a159b82 | 2006-03-22 10:00:18 +0000 | [diff] [blame] | 531 | __cpufreq_driver_target(policy, this_dbs_info->requested_freq, |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 532 | CPUFREQ_RELATION_H); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 533 | return; |
| 534 | } |
| 535 | |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 536 | /* |
| 537 | * The optimal frequency is the frequency that is the lowest that |
| 538 | * can support the current CPU usage without triggering the up |
| 539 | * policy. To be safe, we focus 10 points under the threshold. |
| 540 | */ |
| 541 | if (load < (dbs_tuners_ins.down_threshold - 10)) { |
Dave Jones | f068c04 | 2008-07-30 12:59:56 -0400 | [diff] [blame] | 542 | freq_target = (dbs_tuners_ins.freq_step * policy->max) / 100; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 543 | |
Dave Jones | f068c04 | 2008-07-30 12:59:56 -0400 | [diff] [blame] | 544 | this_dbs_info->requested_freq -= freq_target; |
Alexander Clouter | a159b82 | 2006-03-22 10:00:18 +0000 | [diff] [blame] | 545 | if (this_dbs_info->requested_freq < policy->min) |
| 546 | this_dbs_info->requested_freq = policy->min; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 547 | |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 548 | /* |
| 549 | * if we cannot reduce the frequency anymore, break out early |
| 550 | */ |
| 551 | if (policy->cur == policy->min) |
| 552 | return; |
| 553 | |
Alexander Clouter | a159b82 | 2006-03-22 10:00:18 +0000 | [diff] [blame] | 554 | __cpufreq_driver_target(policy, this_dbs_info->requested_freq, |
Alexander Clouter | 2c906b3 | 2006-03-22 09:54:10 +0000 | [diff] [blame] | 555 | CPUFREQ_RELATION_H); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 556 | return; |
| 557 | } |
| 558 | } |
| 559 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 560 | static void do_dbs_timer(struct work_struct *work) |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 561 | { |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 562 | struct cpu_dbs_info_s *dbs_info = |
| 563 | container_of(work, struct cpu_dbs_info_s, work.work); |
| 564 | unsigned int cpu = dbs_info->cpu; |
| 565 | |
| 566 | /* We want all CPUs to do sampling nearly on same jiffy */ |
| 567 | int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate); |
| 568 | |
| 569 | delay -= jiffies % delay; |
| 570 | |
venkatesh.pallipadi@intel.com | ee88415 | 2009-07-02 17:08:33 -0700 | [diff] [blame] | 571 | mutex_lock(&dbs_info->timer_mutex); |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 572 | |
| 573 | dbs_check_cpu(dbs_info); |
| 574 | |
| 575 | queue_delayed_work_on(cpu, kconservative_wq, &dbs_info->work, delay); |
venkatesh.pallipadi@intel.com | ee88415 | 2009-07-02 17:08:33 -0700 | [diff] [blame] | 576 | mutex_unlock(&dbs_info->timer_mutex); |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 577 | } |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 578 | |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 579 | static inline void dbs_timer_init(struct cpu_dbs_info_s *dbs_info) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 580 | { |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 581 | /* We want all CPUs to do sampling nearly on same jiffy */ |
| 582 | int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate); |
| 583 | delay -= jiffies % delay; |
| 584 | |
| 585 | dbs_info->enable = 1; |
| 586 | INIT_DELAYED_WORK_DEFERRABLE(&dbs_info->work, do_dbs_timer); |
| 587 | queue_delayed_work_on(dbs_info->cpu, kconservative_wq, &dbs_info->work, |
| 588 | delay); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 589 | } |
| 590 | |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 591 | static inline void dbs_timer_exit(struct cpu_dbs_info_s *dbs_info) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 592 | { |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 593 | dbs_info->enable = 0; |
Mathieu Desnoyers | b253d2b | 2009-05-17 10:29:33 -0400 | [diff] [blame] | 594 | cancel_delayed_work_sync(&dbs_info->work); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 595 | } |
| 596 | |
| 597 | static int cpufreq_governor_dbs(struct cpufreq_policy *policy, |
| 598 | unsigned int event) |
| 599 | { |
| 600 | unsigned int cpu = policy->cpu; |
| 601 | struct cpu_dbs_info_s *this_dbs_info; |
| 602 | unsigned int j; |
Jeff Garzik | 914f7c3 | 2006-10-20 14:31:00 -0700 | [diff] [blame] | 603 | int rc; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 604 | |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 605 | this_dbs_info = &per_cpu(cs_cpu_dbs_info, cpu); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 606 | |
| 607 | switch (event) { |
| 608 | case CPUFREQ_GOV_START: |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 609 | if ((!cpu_online(cpu)) || (!policy->cur)) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 610 | return -EINVAL; |
| 611 | |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 612 | mutex_lock(&dbs_mutex); |
Jeff Garzik | 914f7c3 | 2006-10-20 14:31:00 -0700 | [diff] [blame] | 613 | |
Thomas Renninger | 49b015c | 2009-10-01 19:49:28 +0200 | [diff] [blame] | 614 | rc = sysfs_create_group(&policy->kobj, &dbs_attr_group_old); |
Jeff Garzik | 914f7c3 | 2006-10-20 14:31:00 -0700 | [diff] [blame] | 615 | if (rc) { |
| 616 | mutex_unlock(&dbs_mutex); |
| 617 | return rc; |
| 618 | } |
| 619 | |
Rusty Russell | 835481d | 2009-01-04 05:18:06 -0800 | [diff] [blame] | 620 | for_each_cpu(j, policy->cpus) { |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 621 | struct cpu_dbs_info_s *j_dbs_info; |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 622 | j_dbs_info = &per_cpu(cs_cpu_dbs_info, j); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 623 | j_dbs_info->cur_policy = policy; |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 624 | |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 625 | j_dbs_info->prev_cpu_idle = get_cpu_idle_time(j, |
| 626 | &j_dbs_info->prev_cpu_wall); |
| 627 | if (dbs_tuners_ins.ignore_nice) { |
| 628 | j_dbs_info->prev_cpu_nice = |
| 629 | kstat_cpu(j).cpustat.nice; |
| 630 | } |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 631 | } |
Alexander Clouter | a159b82 | 2006-03-22 10:00:18 +0000 | [diff] [blame] | 632 | this_dbs_info->down_skip = 0; |
| 633 | this_dbs_info->requested_freq = policy->cur; |
Jeff Garzik | 914f7c3 | 2006-10-20 14:31:00 -0700 | [diff] [blame] | 634 | |
venkatesh.pallipadi@intel.com | ee88415 | 2009-07-02 17:08:33 -0700 | [diff] [blame] | 635 | mutex_init(&this_dbs_info->timer_mutex); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 636 | dbs_enable++; |
| 637 | /* |
| 638 | * Start the timerschedule work, when this governor |
| 639 | * is used for first time |
| 640 | */ |
| 641 | if (dbs_enable == 1) { |
| 642 | unsigned int latency; |
| 643 | /* policy latency is in nS. Convert it to uS first */ |
Alexander Clouter | 2c906b3 | 2006-03-22 09:54:10 +0000 | [diff] [blame] | 644 | latency = policy->cpuinfo.transition_latency / 1000; |
| 645 | if (latency == 0) |
| 646 | latency = 1; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 647 | |
Thomas Renninger | 49b015c | 2009-10-01 19:49:28 +0200 | [diff] [blame] | 648 | rc = sysfs_create_group(cpufreq_global_kobject, |
| 649 | &dbs_attr_group); |
| 650 | if (rc) { |
| 651 | mutex_unlock(&dbs_mutex); |
| 652 | return rc; |
| 653 | } |
| 654 | |
Thomas Renninger | cef9615 | 2009-04-22 13:48:29 +0200 | [diff] [blame] | 655 | /* |
| 656 | * conservative does not implement micro like ondemand |
| 657 | * governor, thus we are bound to jiffes/HZ |
| 658 | */ |
| 659 | min_sampling_rate = |
| 660 | MIN_SAMPLING_RATE_RATIO * jiffies_to_usecs(10); |
| 661 | /* Bring kernel and HW constraints together */ |
| 662 | min_sampling_rate = max(min_sampling_rate, |
| 663 | MIN_LATENCY_MULTIPLIER * latency); |
| 664 | dbs_tuners_ins.sampling_rate = |
| 665 | max(min_sampling_rate, |
| 666 | latency * LATENCY_MULTIPLIER); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 667 | |
Elias Oltmanns | a8d7c3b | 2007-10-22 09:50:13 +0200 | [diff] [blame] | 668 | cpufreq_register_notifier( |
| 669 | &dbs_cpufreq_notifier_block, |
| 670 | CPUFREQ_TRANSITION_NOTIFIER); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 671 | } |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 672 | mutex_unlock(&dbs_mutex); |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 673 | |
venkatesh.pallipadi@intel.com | 7d26e2d | 2009-07-02 17:08:30 -0700 | [diff] [blame] | 674 | dbs_timer_init(this_dbs_info); |
| 675 | |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 676 | break; |
| 677 | |
| 678 | case CPUFREQ_GOV_STOP: |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 679 | dbs_timer_exit(this_dbs_info); |
venkatesh.pallipadi@intel.com | 7d26e2d | 2009-07-02 17:08:30 -0700 | [diff] [blame] | 680 | |
| 681 | mutex_lock(&dbs_mutex); |
Thomas Renninger | 49b015c | 2009-10-01 19:49:28 +0200 | [diff] [blame] | 682 | sysfs_remove_group(&policy->kobj, &dbs_attr_group_old); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 683 | dbs_enable--; |
venkatesh.pallipadi@intel.com | ee88415 | 2009-07-02 17:08:33 -0700 | [diff] [blame] | 684 | mutex_destroy(&this_dbs_info->timer_mutex); |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 685 | |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 686 | /* |
| 687 | * Stop the timerschedule work, when this governor |
| 688 | * is used for first time |
| 689 | */ |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 690 | if (dbs_enable == 0) |
Elias Oltmanns | a8d7c3b | 2007-10-22 09:50:13 +0200 | [diff] [blame] | 691 | cpufreq_unregister_notifier( |
| 692 | &dbs_cpufreq_notifier_block, |
| 693 | CPUFREQ_TRANSITION_NOTIFIER); |
Elias Oltmanns | a8d7c3b | 2007-10-22 09:50:13 +0200 | [diff] [blame] | 694 | |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 695 | mutex_unlock(&dbs_mutex); |
Thomas Renninger | 49b015c | 2009-10-01 19:49:28 +0200 | [diff] [blame] | 696 | if (!dbs_enable) |
| 697 | sysfs_remove_group(cpufreq_global_kobject, |
| 698 | &dbs_attr_group); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 699 | |
| 700 | break; |
| 701 | |
| 702 | case CPUFREQ_GOV_LIMITS: |
venkatesh.pallipadi@intel.com | ee88415 | 2009-07-02 17:08:33 -0700 | [diff] [blame] | 703 | mutex_lock(&this_dbs_info->timer_mutex); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 704 | if (policy->max < this_dbs_info->cur_policy->cur) |
| 705 | __cpufreq_driver_target( |
| 706 | this_dbs_info->cur_policy, |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 707 | policy->max, CPUFREQ_RELATION_H); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 708 | else if (policy->min > this_dbs_info->cur_policy->cur) |
| 709 | __cpufreq_driver_target( |
| 710 | this_dbs_info->cur_policy, |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 711 | policy->min, CPUFREQ_RELATION_L); |
venkatesh.pallipadi@intel.com | ee88415 | 2009-07-02 17:08:33 -0700 | [diff] [blame] | 712 | mutex_unlock(&this_dbs_info->timer_mutex); |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 713 | |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 714 | break; |
| 715 | } |
| 716 | return 0; |
| 717 | } |
| 718 | |
Sven Wegener | c4d14bc | 2008-09-20 16:50:08 +0200 | [diff] [blame] | 719 | #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE |
| 720 | static |
| 721 | #endif |
Thomas Renninger | 1c25624 | 2007-10-02 13:28:12 -0700 | [diff] [blame] | 722 | struct cpufreq_governor cpufreq_gov_conservative = { |
| 723 | .name = "conservative", |
| 724 | .governor = cpufreq_governor_dbs, |
| 725 | .max_transition_latency = TRANSITION_LATENCY_LIMIT, |
| 726 | .owner = THIS_MODULE, |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 727 | }; |
| 728 | |
| 729 | static int __init cpufreq_gov_dbs_init(void) |
| 730 | { |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 731 | int err; |
| 732 | |
| 733 | kconservative_wq = create_workqueue("kconservative"); |
| 734 | if (!kconservative_wq) { |
| 735 | printk(KERN_ERR "Creation of kconservative failed\n"); |
| 736 | return -EFAULT; |
| 737 | } |
| 738 | |
| 739 | err = cpufreq_register_governor(&cpufreq_gov_conservative); |
| 740 | if (err) |
| 741 | destroy_workqueue(kconservative_wq); |
| 742 | |
| 743 | return err; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 744 | } |
| 745 | |
| 746 | static void __exit cpufreq_gov_dbs_exit(void) |
| 747 | { |
Thomas Renninger | 1c25624 | 2007-10-02 13:28:12 -0700 | [diff] [blame] | 748 | cpufreq_unregister_governor(&cpufreq_gov_conservative); |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 749 | destroy_workqueue(kconservative_wq); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 750 | } |
| 751 | |
| 752 | |
Alexander Clouter | 11a80a9c76 | 2009-02-13 19:01:01 +0000 | [diff] [blame] | 753 | MODULE_AUTHOR("Alexander Clouter <alex@digriz.org.uk>"); |
Dave Jones | 9acef48 | 2009-01-18 01:39:51 -0500 | [diff] [blame] | 754 | MODULE_DESCRIPTION("'cpufreq_conservative' - A dynamic cpufreq governor for " |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 755 | "Low Latency Frequency Transition capable processors " |
| 756 | "optimised for use in a battery environment"); |
Dave Jones | 9acef48 | 2009-01-18 01:39:51 -0500 | [diff] [blame] | 757 | MODULE_LICENSE("GPL"); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 758 | |
Johannes Weiner | 6915719 | 2008-01-17 15:21:08 -0800 | [diff] [blame] | 759 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE |
| 760 | fs_initcall(cpufreq_gov_dbs_init); |
| 761 | #else |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 762 | module_init(cpufreq_gov_dbs_init); |
Johannes Weiner | 6915719 | 2008-01-17 15:21:08 -0800 | [diff] [blame] | 763 | #endif |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 764 | module_exit(cpufreq_gov_dbs_exit); |