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