Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/drivers/cpufreq/cpufreq.c |
| 3 | * |
| 4 | * Copyright (C) 2001 Russell King |
| 5 | * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de> |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 6 | * (C) 2013 Viresh Kumar <viresh.kumar@linaro.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * |
Ashok Raj | c32b6b8 | 2005-10-30 14:59:54 -0800 | [diff] [blame] | 8 | * Oct 2005 - Ashok Raj <ashok.raj@intel.com> |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 9 | * Added handling for CPU hotplug |
Dave Jones | 8ff6973 | 2006-03-05 03:37:23 -0500 | [diff] [blame] | 10 | * Feb 2006 - Jacob Shin <jacob.shin@amd.com> |
| 11 | * Fix handling for CPU hotplug -- affected CPUs |
Ashok Raj | c32b6b8 | 2005-10-30 14:59:54 -0800 | [diff] [blame] | 12 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * This program is free software; you can redistribute it and/or modify |
| 14 | * it under the terms of the GNU General Public License version 2 as |
| 15 | * published by the Free Software Foundation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | */ |
| 17 | |
Viresh Kumar | db70115 | 2012-10-23 01:29:03 +0200 | [diff] [blame] | 18 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 19 | |
Viresh Kumar | 5ff0a26 | 2013-08-06 22:53:03 +0530 | [diff] [blame] | 20 | #include <linux/cpu.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/cpufreq.h> |
| 22 | #include <linux/delay.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/device.h> |
Viresh Kumar | 5ff0a26 | 2013-08-06 22:53:03 +0530 | [diff] [blame] | 24 | #include <linux/init.h> |
| 25 | #include <linux/kernel_stat.h> |
| 26 | #include <linux/module.h> |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 27 | #include <linux/mutex.h> |
Viresh Kumar | 5ff0a26 | 2013-08-06 22:53:03 +0530 | [diff] [blame] | 28 | #include <linux/slab.h> |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 29 | #include <linux/suspend.h> |
Doug Anderson | 90de2a4 | 2014-12-23 22:09:48 -0800 | [diff] [blame] | 30 | #include <linux/syscore_ops.h> |
Viresh Kumar | 5ff0a26 | 2013-08-06 22:53:03 +0530 | [diff] [blame] | 31 | #include <linux/tick.h> |
Thomas Renninger | 6f4f272 | 2010-04-20 13:17:36 +0200 | [diff] [blame] | 32 | #include <trace/events/power.h> |
| 33 | |
Viresh Kumar | b4f0676 | 2015-01-27 14:06:08 +0530 | [diff] [blame] | 34 | static LIST_HEAD(cpufreq_policy_list); |
Viresh Kumar | f963735 | 2015-05-12 12:20:11 +0530 | [diff] [blame] | 35 | |
| 36 | static inline bool policy_is_inactive(struct cpufreq_policy *policy) |
| 37 | { |
| 38 | return cpumask_empty(policy->cpus); |
| 39 | } |
| 40 | |
| 41 | static bool suitable_policy(struct cpufreq_policy *policy, bool active) |
| 42 | { |
| 43 | return active == !policy_is_inactive(policy); |
| 44 | } |
| 45 | |
| 46 | /* Finds Next Acive/Inactive policy */ |
| 47 | static struct cpufreq_policy *next_policy(struct cpufreq_policy *policy, |
| 48 | bool active) |
| 49 | { |
| 50 | do { |
| 51 | policy = list_next_entry(policy, policy_list); |
| 52 | |
| 53 | /* No more policies in the list */ |
| 54 | if (&policy->policy_list == &cpufreq_policy_list) |
| 55 | return NULL; |
| 56 | } while (!suitable_policy(policy, active)); |
| 57 | |
| 58 | return policy; |
| 59 | } |
| 60 | |
| 61 | static struct cpufreq_policy *first_policy(bool active) |
| 62 | { |
| 63 | struct cpufreq_policy *policy; |
| 64 | |
| 65 | /* No policies in the list */ |
| 66 | if (list_empty(&cpufreq_policy_list)) |
| 67 | return NULL; |
| 68 | |
| 69 | policy = list_first_entry(&cpufreq_policy_list, typeof(*policy), |
| 70 | policy_list); |
| 71 | |
| 72 | if (!suitable_policy(policy, active)) |
| 73 | policy = next_policy(policy, active); |
| 74 | |
| 75 | return policy; |
| 76 | } |
| 77 | |
| 78 | /* Macros to iterate over CPU policies */ |
| 79 | #define for_each_suitable_policy(__policy, __active) \ |
| 80 | for (__policy = first_policy(__active); \ |
| 81 | __policy; \ |
| 82 | __policy = next_policy(__policy, __active)) |
| 83 | |
| 84 | #define for_each_active_policy(__policy) \ |
| 85 | for_each_suitable_policy(__policy, true) |
| 86 | #define for_each_inactive_policy(__policy) \ |
| 87 | for_each_suitable_policy(__policy, false) |
| 88 | |
| 89 | #define for_each_policy(__policy) \ |
Viresh Kumar | b4f0676 | 2015-01-27 14:06:08 +0530 | [diff] [blame] | 90 | list_for_each_entry(__policy, &cpufreq_policy_list, policy_list) |
| 91 | |
Viresh Kumar | f7b2706 | 2015-01-27 14:06:09 +0530 | [diff] [blame] | 92 | /* Iterate over governors */ |
| 93 | static LIST_HEAD(cpufreq_governor_list); |
| 94 | #define for_each_governor(__governor) \ |
| 95 | list_for_each_entry(__governor, &cpufreq_governor_list, governor_list) |
| 96 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | /** |
Dave Jones | cd87847 | 2006-08-11 17:59:28 -0400 | [diff] [blame] | 98 | * The "cpufreq driver" - the arch- or hardware-dependent low |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | * level driver of CPUFreq support, and its spinlock. This lock |
| 100 | * also protects the cpufreq_cpu_data array. |
| 101 | */ |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 102 | static struct cpufreq_driver *cpufreq_driver; |
Mike Travis | 7a6aedf | 2008-03-25 15:06:53 -0700 | [diff] [blame] | 103 | static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data); |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 104 | static DEFINE_RWLOCK(cpufreq_driver_lock); |
Jane Li | 6f1e4ef | 2014-01-03 17:17:41 +0800 | [diff] [blame] | 105 | DEFINE_MUTEX(cpufreq_governor_lock); |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 106 | |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 107 | /* Flag to suspend/resume CPUFreq governors */ |
| 108 | static bool cpufreq_suspended; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 110 | static inline bool has_target(void) |
| 111 | { |
| 112 | return cpufreq_driver->target_index || cpufreq_driver->target; |
| 113 | } |
| 114 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | /* internal prototypes */ |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 116 | static int __cpufreq_governor(struct cpufreq_policy *policy, |
| 117 | unsigned int event); |
Viresh Kumar | d92d50a | 2015-01-02 12:34:29 +0530 | [diff] [blame] | 118 | static unsigned int __cpufreq_get(struct cpufreq_policy *policy); |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 119 | static void handle_update(struct work_struct *work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
| 121 | /** |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 122 | * Two notifier lists: the "policy" list is involved in the |
| 123 | * validation process for a new CPU frequency policy; the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | * "transition" list for kernel code that needs to handle |
| 125 | * changes to devices when the CPU clock speed changes. |
| 126 | * The mutex locks both lists. |
| 127 | */ |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 128 | static BLOCKING_NOTIFIER_HEAD(cpufreq_policy_notifier_list); |
Alan Stern | b4dfdbb | 2006-10-04 02:17:06 -0700 | [diff] [blame] | 129 | static struct srcu_notifier_head cpufreq_transition_notifier_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
Cesar Eduardo Barros | 74212ca | 2008-02-16 08:41:24 -0200 | [diff] [blame] | 131 | static bool init_cpufreq_transition_notifier_list_called; |
Alan Stern | b4dfdbb | 2006-10-04 02:17:06 -0700 | [diff] [blame] | 132 | static int __init init_cpufreq_transition_notifier_list(void) |
| 133 | { |
| 134 | srcu_init_notifier_head(&cpufreq_transition_notifier_list); |
Cesar Eduardo Barros | 74212ca | 2008-02-16 08:41:24 -0200 | [diff] [blame] | 135 | init_cpufreq_transition_notifier_list_called = true; |
Alan Stern | b4dfdbb | 2006-10-04 02:17:06 -0700 | [diff] [blame] | 136 | return 0; |
| 137 | } |
Linus Torvalds | b3438f8 | 2006-11-20 11:47:18 -0800 | [diff] [blame] | 138 | pure_initcall(init_cpufreq_transition_notifier_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | |
Konrad Rzeszutek Wilk | a7b422c | 2012-03-13 19:18:39 -0400 | [diff] [blame] | 140 | static int off __read_mostly; |
Viresh Kumar | da58445 | 2012-10-26 00:51:32 +0200 | [diff] [blame] | 141 | static int cpufreq_disabled(void) |
Konrad Rzeszutek Wilk | a7b422c | 2012-03-13 19:18:39 -0400 | [diff] [blame] | 142 | { |
| 143 | return off; |
| 144 | } |
| 145 | void disable_cpufreq(void) |
| 146 | { |
| 147 | off = 1; |
| 148 | } |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 149 | static DEFINE_MUTEX(cpufreq_governor_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 151 | bool have_governor_per_policy(void) |
| 152 | { |
Viresh Kumar | 0b981e7 | 2013-10-02 14:13:18 +0530 | [diff] [blame] | 153 | return !!(cpufreq_driver->flags & CPUFREQ_HAVE_GOVERNOR_PER_POLICY); |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 154 | } |
Viresh Kumar | 3f869d6 | 2013-05-16 05:09:56 +0000 | [diff] [blame] | 155 | EXPORT_SYMBOL_GPL(have_governor_per_policy); |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 156 | |
Viresh Kumar | 944e9a0 | 2013-05-16 05:09:57 +0000 | [diff] [blame] | 157 | struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy) |
| 158 | { |
| 159 | if (have_governor_per_policy()) |
| 160 | return &policy->kobj; |
| 161 | else |
| 162 | return cpufreq_global_kobject; |
| 163 | } |
| 164 | EXPORT_SYMBOL_GPL(get_governor_parent_kobj); |
| 165 | |
Viresh Kumar | 5a31d59 | 2015-07-10 01:43:27 +0200 | [diff] [blame] | 166 | struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu) |
| 167 | { |
| 168 | struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); |
| 169 | |
| 170 | return policy && !policy_is_inactive(policy) ? |
| 171 | policy->freq_table : NULL; |
| 172 | } |
| 173 | EXPORT_SYMBOL_GPL(cpufreq_frequency_get_table); |
| 174 | |
Viresh Kumar | 72a4ce3 | 2013-05-17 11:26:32 +0000 | [diff] [blame] | 175 | static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall) |
| 176 | { |
| 177 | u64 idle_time; |
| 178 | u64 cur_wall_time; |
| 179 | u64 busy_time; |
| 180 | |
| 181 | cur_wall_time = jiffies64_to_cputime64(get_jiffies_64()); |
| 182 | |
| 183 | busy_time = kcpustat_cpu(cpu).cpustat[CPUTIME_USER]; |
| 184 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SYSTEM]; |
| 185 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_IRQ]; |
| 186 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SOFTIRQ]; |
| 187 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_STEAL]; |
| 188 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE]; |
| 189 | |
| 190 | idle_time = cur_wall_time - busy_time; |
| 191 | if (wall) |
| 192 | *wall = cputime_to_usecs(cur_wall_time); |
| 193 | |
| 194 | return cputime_to_usecs(idle_time); |
| 195 | } |
| 196 | |
| 197 | u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy) |
| 198 | { |
| 199 | u64 idle_time = get_cpu_idle_time_us(cpu, io_busy ? wall : NULL); |
| 200 | |
| 201 | if (idle_time == -1ULL) |
| 202 | return get_cpu_idle_time_jiffy(cpu, wall); |
| 203 | else if (!io_busy) |
| 204 | idle_time += get_cpu_iowait_time_us(cpu, wall); |
| 205 | |
| 206 | return idle_time; |
| 207 | } |
| 208 | EXPORT_SYMBOL_GPL(get_cpu_idle_time); |
| 209 | |
Viresh Kumar | 70e9e77 | 2013-10-03 20:29:07 +0530 | [diff] [blame] | 210 | /* |
| 211 | * This is a generic cpufreq init() routine which can be used by cpufreq |
| 212 | * drivers of SMP systems. It will do following: |
| 213 | * - validate & show freq table passed |
| 214 | * - set policies transition latency |
| 215 | * - policy->cpus with all possible CPUs |
| 216 | */ |
| 217 | int cpufreq_generic_init(struct cpufreq_policy *policy, |
| 218 | struct cpufreq_frequency_table *table, |
| 219 | unsigned int transition_latency) |
| 220 | { |
| 221 | int ret; |
| 222 | |
| 223 | ret = cpufreq_table_validate_and_show(policy, table); |
| 224 | if (ret) { |
| 225 | pr_err("%s: invalid frequency table: %d\n", __func__, ret); |
| 226 | return ret; |
| 227 | } |
| 228 | |
| 229 | policy->cpuinfo.transition_latency = transition_latency; |
| 230 | |
| 231 | /* |
Shailendra Verma | 58405af | 2015-05-22 22:48:22 +0530 | [diff] [blame] | 232 | * The driver only supports the SMP configuration where all processors |
Viresh Kumar | 70e9e77 | 2013-10-03 20:29:07 +0530 | [diff] [blame] | 233 | * share the clock and voltage and clock. |
| 234 | */ |
| 235 | cpumask_setall(policy->cpus); |
| 236 | |
| 237 | return 0; |
| 238 | } |
| 239 | EXPORT_SYMBOL_GPL(cpufreq_generic_init); |
| 240 | |
Rafael J. Wysocki | 1f0bd44 | 2015-09-16 02:17:49 +0200 | [diff] [blame] | 241 | struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu) |
Viresh Kumar | 652ed95 | 2014-01-09 20:38:43 +0530 | [diff] [blame] | 242 | { |
| 243 | struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); |
| 244 | |
Viresh Kumar | 988bed0 | 2015-05-08 11:53:45 +0530 | [diff] [blame] | 245 | return policy && cpumask_test_cpu(cpu, policy->cpus) ? policy : NULL; |
| 246 | } |
Rafael J. Wysocki | 1f0bd44 | 2015-09-16 02:17:49 +0200 | [diff] [blame] | 247 | EXPORT_SYMBOL_GPL(cpufreq_cpu_get_raw); |
Viresh Kumar | 988bed0 | 2015-05-08 11:53:45 +0530 | [diff] [blame] | 248 | |
| 249 | unsigned int cpufreq_generic_get(unsigned int cpu) |
| 250 | { |
| 251 | struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu); |
| 252 | |
Viresh Kumar | 652ed95 | 2014-01-09 20:38:43 +0530 | [diff] [blame] | 253 | if (!policy || IS_ERR(policy->clk)) { |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 254 | pr_err("%s: No %s associated to cpu: %d\n", |
| 255 | __func__, policy ? "clk" : "policy", cpu); |
Viresh Kumar | 652ed95 | 2014-01-09 20:38:43 +0530 | [diff] [blame] | 256 | return 0; |
| 257 | } |
| 258 | |
| 259 | return clk_get_rate(policy->clk) / 1000; |
| 260 | } |
| 261 | EXPORT_SYMBOL_GPL(cpufreq_generic_get); |
| 262 | |
Viresh Kumar | 50e9c85 | 2015-02-19 17:02:03 +0530 | [diff] [blame] | 263 | /** |
| 264 | * cpufreq_cpu_get: returns policy for a cpu and marks it busy. |
| 265 | * |
| 266 | * @cpu: cpu to find policy for. |
| 267 | * |
| 268 | * This returns policy for 'cpu', returns NULL if it doesn't exist. |
| 269 | * It also increments the kobject reference count to mark it busy and so would |
| 270 | * require a corresponding call to cpufreq_cpu_put() to decrement it back. |
| 271 | * If corresponding call cpufreq_cpu_put() isn't made, the policy wouldn't be |
| 272 | * freed as that depends on the kobj count. |
| 273 | * |
Viresh Kumar | 50e9c85 | 2015-02-19 17:02:03 +0530 | [diff] [blame] | 274 | * Return: A valid policy on success, otherwise NULL on failure. |
| 275 | */ |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 276 | struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | { |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 278 | struct cpufreq_policy *policy = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | unsigned long flags; |
| 280 | |
Viresh Kumar | 1b947c9 | 2015-02-19 17:02:05 +0530 | [diff] [blame] | 281 | if (WARN_ON(cpu >= nr_cpu_ids)) |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 282 | return NULL; |
| 283 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | /* get the cpufreq driver */ |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 285 | read_lock_irqsave(&cpufreq_driver_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 287 | if (cpufreq_driver) { |
| 288 | /* get the CPU */ |
Viresh Kumar | 988bed0 | 2015-05-08 11:53:45 +0530 | [diff] [blame] | 289 | policy = cpufreq_cpu_get_raw(cpu); |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 290 | if (policy) |
| 291 | kobject_get(&policy->kobj); |
| 292 | } |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 293 | |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 294 | read_unlock_irqrestore(&cpufreq_driver_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 296 | return policy; |
Stephen Boyd | a914443 | 2012-07-20 18:14:38 +0000 | [diff] [blame] | 297 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | EXPORT_SYMBOL_GPL(cpufreq_cpu_get); |
| 299 | |
Viresh Kumar | 50e9c85 | 2015-02-19 17:02:03 +0530 | [diff] [blame] | 300 | /** |
| 301 | * cpufreq_cpu_put: Decrements the usage count of a policy |
| 302 | * |
| 303 | * @policy: policy earlier returned by cpufreq_cpu_get(). |
| 304 | * |
| 305 | * This decrements the kobject reference count incremented earlier by calling |
| 306 | * cpufreq_cpu_get(). |
Viresh Kumar | 50e9c85 | 2015-02-19 17:02:03 +0530 | [diff] [blame] | 307 | */ |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 308 | void cpufreq_cpu_put(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | { |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 310 | kobject_put(&policy->kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | } |
| 312 | EXPORT_SYMBOL_GPL(cpufreq_cpu_put); |
| 313 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | /********************************************************************* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | * EXTERNALLY AFFECTING FREQUENCY CHANGES * |
| 316 | *********************************************************************/ |
| 317 | |
| 318 | /** |
| 319 | * adjust_jiffies - adjust the system "loops_per_jiffy" |
| 320 | * |
| 321 | * This function alters the system "loops_per_jiffy" for the clock |
| 322 | * speed change. Note that loops_per_jiffy cannot be updated on SMP |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 323 | * systems as each CPU might be scaled differently. So, use the arch |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | * per-CPU loops_per_jiffy value wherever possible. |
| 325 | */ |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 326 | static void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | { |
Viresh Kumar | 39c132e | 2015-01-02 12:34:34 +0530 | [diff] [blame] | 328 | #ifndef CONFIG_SMP |
| 329 | static unsigned long l_p_j_ref; |
| 330 | static unsigned int l_p_j_ref_freq; |
| 331 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | if (ci->flags & CPUFREQ_CONST_LOOPS) |
| 333 | return; |
| 334 | |
| 335 | if (!l_p_j_ref_freq) { |
| 336 | l_p_j_ref = loops_per_jiffy; |
| 337 | l_p_j_ref_freq = ci->old; |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 338 | pr_debug("saving %lu as reference value for loops_per_jiffy; freq is %u kHz\n", |
| 339 | l_p_j_ref, l_p_j_ref_freq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | } |
Viresh Kumar | 0b443ea | 2014-03-19 11:24:58 +0530 | [diff] [blame] | 341 | if (val == CPUFREQ_POSTCHANGE && ci->old != ci->new) { |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 342 | loops_per_jiffy = cpufreq_scale(l_p_j_ref, l_p_j_ref_freq, |
| 343 | ci->new); |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 344 | pr_debug("scaling loops_per_jiffy to %lu for frequency %u kHz\n", |
| 345 | loops_per_jiffy, ci->new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | #endif |
Viresh Kumar | 39c132e | 2015-01-02 12:34:34 +0530 | [diff] [blame] | 348 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | |
Viresh Kumar | 0956df9c | 2013-06-19 14:19:34 +0530 | [diff] [blame] | 350 | static void __cpufreq_notify_transition(struct cpufreq_policy *policy, |
Viresh Kumar | b43a7ff | 2013-03-24 11:56:43 +0530 | [diff] [blame] | 351 | struct cpufreq_freqs *freqs, unsigned int state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | { |
| 353 | BUG_ON(irqs_disabled()); |
| 354 | |
Dirk Brandewie | d5aaffa | 2013-01-17 16:22:21 +0000 | [diff] [blame] | 355 | if (cpufreq_disabled()) |
| 356 | return; |
| 357 | |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 358 | freqs->flags = cpufreq_driver->flags; |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 359 | pr_debug("notification %u of frequency transition to %u kHz\n", |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 360 | state, freqs->new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | switch (state) { |
Dave Jones | e4472cb | 2006-01-31 15:53:55 -0800 | [diff] [blame] | 363 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | case CPUFREQ_PRECHANGE: |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 365 | /* detect if the driver reported a value as "old frequency" |
Dave Jones | e4472cb | 2006-01-31 15:53:55 -0800 | [diff] [blame] | 366 | * which is not equal to what the cpufreq core thinks is |
| 367 | * "old frequency". |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | */ |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 369 | if (!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) { |
Dave Jones | e4472cb | 2006-01-31 15:53:55 -0800 | [diff] [blame] | 370 | if ((policy) && (policy->cpu == freqs->cpu) && |
| 371 | (policy->cur) && (policy->cur != freqs->old)) { |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 372 | pr_debug("Warning: CPU frequency is %u, cpufreq assumed %u kHz\n", |
| 373 | freqs->old, policy->cur); |
Dave Jones | e4472cb | 2006-01-31 15:53:55 -0800 | [diff] [blame] | 374 | freqs->old = policy->cur; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | } |
| 376 | } |
Alan Stern | b4dfdbb | 2006-10-04 02:17:06 -0700 | [diff] [blame] | 377 | srcu_notifier_call_chain(&cpufreq_transition_notifier_list, |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 378 | CPUFREQ_PRECHANGE, freqs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | adjust_jiffies(CPUFREQ_PRECHANGE, freqs); |
| 380 | break; |
Dave Jones | e4472cb | 2006-01-31 15:53:55 -0800 | [diff] [blame] | 381 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | case CPUFREQ_POSTCHANGE: |
| 383 | adjust_jiffies(CPUFREQ_POSTCHANGE, freqs); |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 384 | pr_debug("FREQ: %lu - CPU: %lu\n", |
| 385 | (unsigned long)freqs->new, (unsigned long)freqs->cpu); |
Thomas Renninger | 25e4193 | 2011-01-03 17:50:44 +0100 | [diff] [blame] | 386 | trace_cpu_frequency(freqs->new, freqs->cpu); |
Alan Stern | b4dfdbb | 2006-10-04 02:17:06 -0700 | [diff] [blame] | 387 | srcu_notifier_call_chain(&cpufreq_transition_notifier_list, |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 388 | CPUFREQ_POSTCHANGE, freqs); |
Dave Jones | e4472cb | 2006-01-31 15:53:55 -0800 | [diff] [blame] | 389 | if (likely(policy) && likely(policy->cpu == freqs->cpu)) |
| 390 | policy->cur = freqs->new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | break; |
| 392 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | } |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 394 | |
Viresh Kumar | b43a7ff | 2013-03-24 11:56:43 +0530 | [diff] [blame] | 395 | /** |
| 396 | * cpufreq_notify_transition - call notifier chain and adjust_jiffies |
| 397 | * on frequency transition. |
| 398 | * |
| 399 | * This function calls the transition notifiers and the "adjust_jiffies" |
| 400 | * function. It is called twice on all CPU frequency changes that have |
| 401 | * external effects. |
| 402 | */ |
Viresh Kumar | 236a980 | 2014-03-24 13:35:46 +0530 | [diff] [blame] | 403 | static void cpufreq_notify_transition(struct cpufreq_policy *policy, |
Viresh Kumar | b43a7ff | 2013-03-24 11:56:43 +0530 | [diff] [blame] | 404 | struct cpufreq_freqs *freqs, unsigned int state) |
| 405 | { |
| 406 | for_each_cpu(freqs->cpu, policy->cpus) |
| 407 | __cpufreq_notify_transition(policy, freqs, state); |
| 408 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | |
Viresh Kumar | f7ba3b4 | 2013-12-02 11:04:12 +0530 | [diff] [blame] | 410 | /* Do post notifications when there are chances that transition has failed */ |
Viresh Kumar | 236a980 | 2014-03-24 13:35:46 +0530 | [diff] [blame] | 411 | static void cpufreq_notify_post_transition(struct cpufreq_policy *policy, |
Viresh Kumar | f7ba3b4 | 2013-12-02 11:04:12 +0530 | [diff] [blame] | 412 | struct cpufreq_freqs *freqs, int transition_failed) |
| 413 | { |
| 414 | cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE); |
| 415 | if (!transition_failed) |
| 416 | return; |
| 417 | |
| 418 | swap(freqs->old, freqs->new); |
| 419 | cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE); |
| 420 | cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE); |
| 421 | } |
Viresh Kumar | f7ba3b4 | 2013-12-02 11:04:12 +0530 | [diff] [blame] | 422 | |
Srivatsa S. Bhat | 12478cf | 2014-03-24 13:35:44 +0530 | [diff] [blame] | 423 | void cpufreq_freq_transition_begin(struct cpufreq_policy *policy, |
| 424 | struct cpufreq_freqs *freqs) |
| 425 | { |
Srivatsa S. Bhat | ca654dc | 2014-05-05 12:52:39 +0530 | [diff] [blame] | 426 | |
| 427 | /* |
| 428 | * Catch double invocations of _begin() which lead to self-deadlock. |
| 429 | * ASYNC_NOTIFICATION drivers are left out because the cpufreq core |
| 430 | * doesn't invoke _begin() on their behalf, and hence the chances of |
| 431 | * double invocations are very low. Moreover, there are scenarios |
| 432 | * where these checks can emit false-positive warnings in these |
| 433 | * drivers; so we avoid that by skipping them altogether. |
| 434 | */ |
| 435 | WARN_ON(!(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION) |
| 436 | && current == policy->transition_task); |
| 437 | |
Srivatsa S. Bhat | 12478cf | 2014-03-24 13:35:44 +0530 | [diff] [blame] | 438 | wait: |
| 439 | wait_event(policy->transition_wait, !policy->transition_ongoing); |
| 440 | |
| 441 | spin_lock(&policy->transition_lock); |
| 442 | |
| 443 | if (unlikely(policy->transition_ongoing)) { |
| 444 | spin_unlock(&policy->transition_lock); |
| 445 | goto wait; |
| 446 | } |
| 447 | |
| 448 | policy->transition_ongoing = true; |
Srivatsa S. Bhat | ca654dc | 2014-05-05 12:52:39 +0530 | [diff] [blame] | 449 | policy->transition_task = current; |
Srivatsa S. Bhat | 12478cf | 2014-03-24 13:35:44 +0530 | [diff] [blame] | 450 | |
| 451 | spin_unlock(&policy->transition_lock); |
| 452 | |
| 453 | cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE); |
| 454 | } |
| 455 | EXPORT_SYMBOL_GPL(cpufreq_freq_transition_begin); |
| 456 | |
| 457 | void cpufreq_freq_transition_end(struct cpufreq_policy *policy, |
| 458 | struct cpufreq_freqs *freqs, int transition_failed) |
| 459 | { |
| 460 | if (unlikely(WARN_ON(!policy->transition_ongoing))) |
| 461 | return; |
| 462 | |
| 463 | cpufreq_notify_post_transition(policy, freqs, transition_failed); |
| 464 | |
| 465 | policy->transition_ongoing = false; |
Srivatsa S. Bhat | ca654dc | 2014-05-05 12:52:39 +0530 | [diff] [blame] | 466 | policy->transition_task = NULL; |
Srivatsa S. Bhat | 12478cf | 2014-03-24 13:35:44 +0530 | [diff] [blame] | 467 | |
| 468 | wake_up(&policy->transition_wait); |
| 469 | } |
| 470 | EXPORT_SYMBOL_GPL(cpufreq_freq_transition_end); |
| 471 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | /********************************************************************* |
| 474 | * SYSFS INTERFACE * |
| 475 | *********************************************************************/ |
Rashika Kheria | 8a5c74a | 2014-02-26 22:12:42 +0530 | [diff] [blame] | 476 | static ssize_t show_boost(struct kobject *kobj, |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 477 | struct attribute *attr, char *buf) |
| 478 | { |
| 479 | return sprintf(buf, "%d\n", cpufreq_driver->boost_enabled); |
| 480 | } |
| 481 | |
| 482 | static ssize_t store_boost(struct kobject *kobj, struct attribute *attr, |
| 483 | const char *buf, size_t count) |
| 484 | { |
| 485 | int ret, enable; |
| 486 | |
| 487 | ret = sscanf(buf, "%d", &enable); |
| 488 | if (ret != 1 || enable < 0 || enable > 1) |
| 489 | return -EINVAL; |
| 490 | |
| 491 | if (cpufreq_boost_trigger_state(enable)) { |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 492 | pr_err("%s: Cannot %s BOOST!\n", |
| 493 | __func__, enable ? "enable" : "disable"); |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 494 | return -EINVAL; |
| 495 | } |
| 496 | |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 497 | pr_debug("%s: cpufreq BOOST %s\n", |
| 498 | __func__, enable ? "enabled" : "disabled"); |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 499 | |
| 500 | return count; |
| 501 | } |
| 502 | define_one_global_rw(boost); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | |
Viresh Kumar | 42f91fa | 2015-01-02 12:34:26 +0530 | [diff] [blame] | 504 | static struct cpufreq_governor *find_governor(const char *str_governor) |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 505 | { |
| 506 | struct cpufreq_governor *t; |
| 507 | |
Viresh Kumar | f7b2706 | 2015-01-27 14:06:09 +0530 | [diff] [blame] | 508 | for_each_governor(t) |
Rasmus Villemoes | 7c4f453 | 2014-09-29 15:50:11 +0200 | [diff] [blame] | 509 | if (!strncasecmp(str_governor, t->name, CPUFREQ_NAME_LEN)) |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 510 | return t; |
| 511 | |
| 512 | return NULL; |
| 513 | } |
| 514 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | /** |
| 516 | * cpufreq_parse_governor - parse a governor string |
| 517 | */ |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 518 | static int cpufreq_parse_governor(char *str_governor, unsigned int *policy, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | struct cpufreq_governor **governor) |
| 520 | { |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 521 | int err = -EINVAL; |
| 522 | |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 523 | if (cpufreq_driver->setpolicy) { |
Rasmus Villemoes | 7c4f453 | 2014-09-29 15:50:11 +0200 | [diff] [blame] | 524 | if (!strncasecmp(str_governor, "performance", CPUFREQ_NAME_LEN)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | *policy = CPUFREQ_POLICY_PERFORMANCE; |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 526 | err = 0; |
Rasmus Villemoes | 7c4f453 | 2014-09-29 15:50:11 +0200 | [diff] [blame] | 527 | } else if (!strncasecmp(str_governor, "powersave", |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 528 | CPUFREQ_NAME_LEN)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | *policy = CPUFREQ_POLICY_POWERSAVE; |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 530 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | } |
Viresh Kumar | 2e1cc3a | 2015-01-02 12:34:27 +0530 | [diff] [blame] | 532 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | struct cpufreq_governor *t; |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 534 | |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 535 | mutex_lock(&cpufreq_governor_mutex); |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 536 | |
Viresh Kumar | 42f91fa | 2015-01-02 12:34:26 +0530 | [diff] [blame] | 537 | t = find_governor(str_governor); |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 538 | |
Jeremy Fitzhardinge | ea71497 | 2006-07-06 12:32:01 -0700 | [diff] [blame] | 539 | if (t == NULL) { |
Kees Cook | 1a8e146 | 2011-05-04 08:38:56 -0700 | [diff] [blame] | 540 | int ret; |
Jeremy Fitzhardinge | ea71497 | 2006-07-06 12:32:01 -0700 | [diff] [blame] | 541 | |
Kees Cook | 1a8e146 | 2011-05-04 08:38:56 -0700 | [diff] [blame] | 542 | mutex_unlock(&cpufreq_governor_mutex); |
| 543 | ret = request_module("cpufreq_%s", str_governor); |
| 544 | mutex_lock(&cpufreq_governor_mutex); |
Jeremy Fitzhardinge | ea71497 | 2006-07-06 12:32:01 -0700 | [diff] [blame] | 545 | |
Kees Cook | 1a8e146 | 2011-05-04 08:38:56 -0700 | [diff] [blame] | 546 | if (ret == 0) |
Viresh Kumar | 42f91fa | 2015-01-02 12:34:26 +0530 | [diff] [blame] | 547 | t = find_governor(str_governor); |
Jeremy Fitzhardinge | ea71497 | 2006-07-06 12:32:01 -0700 | [diff] [blame] | 548 | } |
| 549 | |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 550 | if (t != NULL) { |
| 551 | *governor = t; |
| 552 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | } |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 554 | |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 555 | mutex_unlock(&cpufreq_governor_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | } |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 557 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | /** |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 561 | * cpufreq_per_cpu_attr_read() / show_##file_name() - |
| 562 | * print out cpufreq information |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | * |
| 564 | * Write out information from cpufreq_driver->policy[cpu]; object must be |
| 565 | * "unsigned int". |
| 566 | */ |
| 567 | |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 568 | #define show_one(file_name, object) \ |
| 569 | static ssize_t show_##file_name \ |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 570 | (struct cpufreq_policy *policy, char *buf) \ |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 571 | { \ |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 572 | return sprintf(buf, "%u\n", policy->object); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | } |
| 574 | |
| 575 | show_one(cpuinfo_min_freq, cpuinfo.min_freq); |
| 576 | show_one(cpuinfo_max_freq, cpuinfo.max_freq); |
Thomas Renninger | ed12978 | 2009-02-04 01:17:41 +0100 | [diff] [blame] | 577 | show_one(cpuinfo_transition_latency, cpuinfo.transition_latency); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | show_one(scaling_min_freq, min); |
| 579 | show_one(scaling_max_freq, max); |
Dirk Brandewie | c034b02 | 2014-10-13 08:37:40 -0700 | [diff] [blame] | 580 | |
Viresh Kumar | 09347b2 | 2015-01-02 12:34:24 +0530 | [diff] [blame] | 581 | static ssize_t show_scaling_cur_freq(struct cpufreq_policy *policy, char *buf) |
Dirk Brandewie | c034b02 | 2014-10-13 08:37:40 -0700 | [diff] [blame] | 582 | { |
| 583 | ssize_t ret; |
| 584 | |
| 585 | if (cpufreq_driver && cpufreq_driver->setpolicy && cpufreq_driver->get) |
| 586 | ret = sprintf(buf, "%u\n", cpufreq_driver->get(policy->cpu)); |
| 587 | else |
| 588 | ret = sprintf(buf, "%u\n", policy->cur); |
| 589 | return ret; |
| 590 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | |
Viresh Kumar | 037ce83 | 2013-10-02 14:13:16 +0530 | [diff] [blame] | 592 | static int cpufreq_set_policy(struct cpufreq_policy *policy, |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 593 | struct cpufreq_policy *new_policy); |
Thomas Renninger | 7970e08 | 2006-04-13 15:14:04 +0200 | [diff] [blame] | 594 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | /** |
| 596 | * cpufreq_per_cpu_attr_write() / store_##file_name() - sysfs write access |
| 597 | */ |
| 598 | #define store_one(file_name, object) \ |
| 599 | static ssize_t store_##file_name \ |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 600 | (struct cpufreq_policy *policy, const char *buf, size_t count) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | { \ |
Vince Hsu | 619c144c | 2014-11-10 14:14:50 +0800 | [diff] [blame] | 602 | int ret, temp; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | struct cpufreq_policy new_policy; \ |
| 604 | \ |
Viresh Kumar | 8fa5b63 | 2015-08-03 08:36:15 +0530 | [diff] [blame] | 605 | memcpy(&new_policy, policy, sizeof(*policy)); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | \ |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 607 | ret = sscanf(buf, "%u", &new_policy.object); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | if (ret != 1) \ |
| 609 | return -EINVAL; \ |
| 610 | \ |
Vince Hsu | 619c144c | 2014-11-10 14:14:50 +0800 | [diff] [blame] | 611 | temp = new_policy.object; \ |
Viresh Kumar | 037ce83 | 2013-10-02 14:13:16 +0530 | [diff] [blame] | 612 | ret = cpufreq_set_policy(policy, &new_policy); \ |
Vince Hsu | 619c144c | 2014-11-10 14:14:50 +0800 | [diff] [blame] | 613 | if (!ret) \ |
| 614 | policy->user_policy.object = temp; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | \ |
| 616 | return ret ? ret : count; \ |
| 617 | } |
| 618 | |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 619 | store_one(scaling_min_freq, min); |
| 620 | store_one(scaling_max_freq, max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | |
| 622 | /** |
| 623 | * show_cpuinfo_cur_freq - current CPU frequency as detected by hardware |
| 624 | */ |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 625 | static ssize_t show_cpuinfo_cur_freq(struct cpufreq_policy *policy, |
| 626 | char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | { |
Viresh Kumar | d92d50a | 2015-01-02 12:34:29 +0530 | [diff] [blame] | 628 | unsigned int cur_freq = __cpufreq_get(policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | if (!cur_freq) |
| 630 | return sprintf(buf, "<unknown>"); |
| 631 | return sprintf(buf, "%u\n", cur_freq); |
| 632 | } |
| 633 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | /** |
| 635 | * show_scaling_governor - show the current policy for the specified CPU |
| 636 | */ |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 637 | static ssize_t show_scaling_governor(struct cpufreq_policy *policy, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | { |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 639 | if (policy->policy == CPUFREQ_POLICY_POWERSAVE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | return sprintf(buf, "powersave\n"); |
| 641 | else if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) |
| 642 | return sprintf(buf, "performance\n"); |
| 643 | else if (policy->governor) |
viresh kumar | 4b972f0 | 2012-10-23 01:23:43 +0200 | [diff] [blame] | 644 | return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 645 | policy->governor->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | return -EINVAL; |
| 647 | } |
| 648 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | /** |
| 650 | * store_scaling_governor - store policy for the specified CPU |
| 651 | */ |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 652 | static ssize_t store_scaling_governor(struct cpufreq_policy *policy, |
| 653 | const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | { |
Srivatsa S. Bhat | 5136fa5 | 2013-09-07 01:24:06 +0530 | [diff] [blame] | 655 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | char str_governor[16]; |
| 657 | struct cpufreq_policy new_policy; |
| 658 | |
Viresh Kumar | 8fa5b63 | 2015-08-03 08:36:15 +0530 | [diff] [blame] | 659 | memcpy(&new_policy, policy, sizeof(*policy)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 661 | ret = sscanf(buf, "%15s", str_governor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | if (ret != 1) |
| 663 | return -EINVAL; |
| 664 | |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 665 | if (cpufreq_parse_governor(str_governor, &new_policy.policy, |
| 666 | &new_policy.governor)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | return -EINVAL; |
| 668 | |
Viresh Kumar | 037ce83 | 2013-10-02 14:13:16 +0530 | [diff] [blame] | 669 | ret = cpufreq_set_policy(policy, &new_policy); |
Viresh Kumar | 88dc438 | 2015-08-03 08:36:18 +0530 | [diff] [blame] | 670 | return ret ? ret : count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | } |
| 672 | |
| 673 | /** |
| 674 | * show_scaling_driver - show the cpufreq driver currently loaded |
| 675 | */ |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 676 | static ssize_t show_scaling_driver(struct cpufreq_policy *policy, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | { |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 678 | return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", cpufreq_driver->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | } |
| 680 | |
| 681 | /** |
| 682 | * show_scaling_available_governors - show the available CPUfreq governors |
| 683 | */ |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 684 | static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy, |
| 685 | char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | { |
| 687 | ssize_t i = 0; |
| 688 | struct cpufreq_governor *t; |
| 689 | |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 690 | if (!has_target()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | i += sprintf(buf, "performance powersave"); |
| 692 | goto out; |
| 693 | } |
| 694 | |
Viresh Kumar | f7b2706 | 2015-01-27 14:06:09 +0530 | [diff] [blame] | 695 | for_each_governor(t) { |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 696 | if (i >= (ssize_t) ((PAGE_SIZE / sizeof(char)) |
| 697 | - (CPUFREQ_NAME_LEN + 2))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | goto out; |
viresh kumar | 4b972f0 | 2012-10-23 01:23:43 +0200 | [diff] [blame] | 699 | i += scnprintf(&buf[i], CPUFREQ_NAME_PLEN, "%s ", t->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | } |
Dave Jones | 7d5e350 | 2006-02-02 17:03:42 -0500 | [diff] [blame] | 701 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | i += sprintf(&buf[i], "\n"); |
| 703 | return i; |
| 704 | } |
Darrick J. Wong | e8628dd | 2008-04-18 13:31:12 -0700 | [diff] [blame] | 705 | |
Lan Tianyu | f4fd379 | 2013-06-27 15:08:54 +0800 | [diff] [blame] | 706 | ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | { |
| 708 | ssize_t i = 0; |
| 709 | unsigned int cpu; |
| 710 | |
Rusty Russell | 835481d | 2009-01-04 05:18:06 -0800 | [diff] [blame] | 711 | for_each_cpu(cpu, mask) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | if (i) |
| 713 | i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), " "); |
| 714 | i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), "%u", cpu); |
| 715 | if (i >= (PAGE_SIZE - 5)) |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 716 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | } |
| 718 | i += sprintf(&buf[i], "\n"); |
| 719 | return i; |
| 720 | } |
Lan Tianyu | f4fd379 | 2013-06-27 15:08:54 +0800 | [diff] [blame] | 721 | EXPORT_SYMBOL_GPL(cpufreq_show_cpus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | |
Darrick J. Wong | e8628dd | 2008-04-18 13:31:12 -0700 | [diff] [blame] | 723 | /** |
| 724 | * show_related_cpus - show the CPUs affected by each transition even if |
| 725 | * hw coordination is in use |
| 726 | */ |
| 727 | static ssize_t show_related_cpus(struct cpufreq_policy *policy, char *buf) |
| 728 | { |
Lan Tianyu | f4fd379 | 2013-06-27 15:08:54 +0800 | [diff] [blame] | 729 | return cpufreq_show_cpus(policy->related_cpus, buf); |
Darrick J. Wong | e8628dd | 2008-04-18 13:31:12 -0700 | [diff] [blame] | 730 | } |
| 731 | |
| 732 | /** |
| 733 | * show_affected_cpus - show the CPUs affected by each transition |
| 734 | */ |
| 735 | static ssize_t show_affected_cpus(struct cpufreq_policy *policy, char *buf) |
| 736 | { |
Lan Tianyu | f4fd379 | 2013-06-27 15:08:54 +0800 | [diff] [blame] | 737 | return cpufreq_show_cpus(policy->cpus, buf); |
Darrick J. Wong | e8628dd | 2008-04-18 13:31:12 -0700 | [diff] [blame] | 738 | } |
| 739 | |
Venki Pallipadi | 9e76988 | 2007-10-26 10:18:21 -0700 | [diff] [blame] | 740 | static ssize_t store_scaling_setspeed(struct cpufreq_policy *policy, |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 741 | const char *buf, size_t count) |
Venki Pallipadi | 9e76988 | 2007-10-26 10:18:21 -0700 | [diff] [blame] | 742 | { |
| 743 | unsigned int freq = 0; |
| 744 | unsigned int ret; |
| 745 | |
CHIKAMA masaki | 879000f | 2008-06-05 22:46:33 -0700 | [diff] [blame] | 746 | if (!policy->governor || !policy->governor->store_setspeed) |
Venki Pallipadi | 9e76988 | 2007-10-26 10:18:21 -0700 | [diff] [blame] | 747 | return -EINVAL; |
| 748 | |
| 749 | ret = sscanf(buf, "%u", &freq); |
| 750 | if (ret != 1) |
| 751 | return -EINVAL; |
| 752 | |
| 753 | policy->governor->store_setspeed(policy, freq); |
| 754 | |
| 755 | return count; |
| 756 | } |
| 757 | |
| 758 | static ssize_t show_scaling_setspeed(struct cpufreq_policy *policy, char *buf) |
| 759 | { |
CHIKAMA masaki | 879000f | 2008-06-05 22:46:33 -0700 | [diff] [blame] | 760 | if (!policy->governor || !policy->governor->show_setspeed) |
Venki Pallipadi | 9e76988 | 2007-10-26 10:18:21 -0700 | [diff] [blame] | 761 | return sprintf(buf, "<unsupported>\n"); |
| 762 | |
| 763 | return policy->governor->show_setspeed(policy, buf); |
| 764 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | |
Thomas Renninger | e2f74f3 | 2009-11-19 12:31:01 +0100 | [diff] [blame] | 766 | /** |
viresh kumar | 8bf1ac72 | 2012-10-23 01:23:33 +0200 | [diff] [blame] | 767 | * show_bios_limit - show the current cpufreq HW/BIOS limitation |
Thomas Renninger | e2f74f3 | 2009-11-19 12:31:01 +0100 | [diff] [blame] | 768 | */ |
| 769 | static ssize_t show_bios_limit(struct cpufreq_policy *policy, char *buf) |
| 770 | { |
| 771 | unsigned int limit; |
| 772 | int ret; |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 773 | if (cpufreq_driver->bios_limit) { |
| 774 | ret = cpufreq_driver->bios_limit(policy->cpu, &limit); |
Thomas Renninger | e2f74f3 | 2009-11-19 12:31:01 +0100 | [diff] [blame] | 775 | if (!ret) |
| 776 | return sprintf(buf, "%u\n", limit); |
| 777 | } |
| 778 | return sprintf(buf, "%u\n", policy->cpuinfo.max_freq); |
| 779 | } |
| 780 | |
Borislav Petkov | 6dad2a2 | 2010-03-31 21:56:46 +0200 | [diff] [blame] | 781 | cpufreq_freq_attr_ro_perm(cpuinfo_cur_freq, 0400); |
| 782 | cpufreq_freq_attr_ro(cpuinfo_min_freq); |
| 783 | cpufreq_freq_attr_ro(cpuinfo_max_freq); |
| 784 | cpufreq_freq_attr_ro(cpuinfo_transition_latency); |
| 785 | cpufreq_freq_attr_ro(scaling_available_governors); |
| 786 | cpufreq_freq_attr_ro(scaling_driver); |
| 787 | cpufreq_freq_attr_ro(scaling_cur_freq); |
| 788 | cpufreq_freq_attr_ro(bios_limit); |
| 789 | cpufreq_freq_attr_ro(related_cpus); |
| 790 | cpufreq_freq_attr_ro(affected_cpus); |
| 791 | cpufreq_freq_attr_rw(scaling_min_freq); |
| 792 | cpufreq_freq_attr_rw(scaling_max_freq); |
| 793 | cpufreq_freq_attr_rw(scaling_governor); |
| 794 | cpufreq_freq_attr_rw(scaling_setspeed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 796 | static struct attribute *default_attrs[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | &cpuinfo_min_freq.attr, |
| 798 | &cpuinfo_max_freq.attr, |
Thomas Renninger | ed12978 | 2009-02-04 01:17:41 +0100 | [diff] [blame] | 799 | &cpuinfo_transition_latency.attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | &scaling_min_freq.attr, |
| 801 | &scaling_max_freq.attr, |
| 802 | &affected_cpus.attr, |
Darrick J. Wong | e8628dd | 2008-04-18 13:31:12 -0700 | [diff] [blame] | 803 | &related_cpus.attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | &scaling_governor.attr, |
| 805 | &scaling_driver.attr, |
| 806 | &scaling_available_governors.attr, |
Venki Pallipadi | 9e76988 | 2007-10-26 10:18:21 -0700 | [diff] [blame] | 807 | &scaling_setspeed.attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | NULL |
| 809 | }; |
| 810 | |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 811 | #define to_policy(k) container_of(k, struct cpufreq_policy, kobj) |
| 812 | #define to_attr(a) container_of(a, struct freq_attr, attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 814 | static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | { |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 816 | struct cpufreq_policy *policy = to_policy(kobj); |
| 817 | struct freq_attr *fattr = to_attr(attr); |
Viresh Kumar | 1b750e3 | 2013-10-02 14:13:09 +0530 | [diff] [blame] | 818 | ssize_t ret; |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 819 | |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 820 | down_read(&policy->rwsem); |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 821 | |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 822 | if (fattr->show) |
| 823 | ret = fattr->show(policy, buf); |
| 824 | else |
| 825 | ret = -EIO; |
| 826 | |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 827 | up_read(&policy->rwsem); |
Viresh Kumar | 1b750e3 | 2013-10-02 14:13:09 +0530 | [diff] [blame] | 828 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | return ret; |
| 830 | } |
| 831 | |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 832 | static ssize_t store(struct kobject *kobj, struct attribute *attr, |
| 833 | const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | { |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 835 | struct cpufreq_policy *policy = to_policy(kobj); |
| 836 | struct freq_attr *fattr = to_attr(attr); |
Dave Jones | a07530b | 2008-03-05 14:22:25 -0500 | [diff] [blame] | 837 | ssize_t ret = -EINVAL; |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 838 | |
Srivatsa S. Bhat | 4f750c9 | 2013-09-07 01:23:43 +0530 | [diff] [blame] | 839 | get_online_cpus(); |
| 840 | |
| 841 | if (!cpu_online(policy->cpu)) |
| 842 | goto unlock; |
| 843 | |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 844 | down_write(&policy->rwsem); |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 845 | |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 846 | if (fattr->store) |
| 847 | ret = fattr->store(policy, buf, count); |
| 848 | else |
| 849 | ret = -EIO; |
| 850 | |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 851 | up_write(&policy->rwsem); |
Srivatsa S. Bhat | 4f750c9 | 2013-09-07 01:23:43 +0530 | [diff] [blame] | 852 | unlock: |
| 853 | put_online_cpus(); |
| 854 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | return ret; |
| 856 | } |
| 857 | |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 858 | static void cpufreq_sysfs_release(struct kobject *kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | { |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 860 | struct cpufreq_policy *policy = to_policy(kobj); |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 861 | pr_debug("last reference is dropped\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | complete(&policy->kobj_unregister); |
| 863 | } |
| 864 | |
Emese Revfy | 52cf25d | 2010-01-19 02:58:23 +0100 | [diff] [blame] | 865 | static const struct sysfs_ops sysfs_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | .show = show, |
| 867 | .store = store, |
| 868 | }; |
| 869 | |
| 870 | static struct kobj_type ktype_cpufreq = { |
| 871 | .sysfs_ops = &sysfs_ops, |
| 872 | .default_attrs = default_attrs, |
| 873 | .release = cpufreq_sysfs_release, |
| 874 | }; |
| 875 | |
Viresh Kumar | 8754914 | 2015-06-10 02:13:21 +0200 | [diff] [blame] | 876 | static int add_cpu_dev_symlink(struct cpufreq_policy *policy, int cpu) |
| 877 | { |
| 878 | struct device *cpu_dev; |
| 879 | |
| 880 | pr_debug("%s: Adding symlink for CPU: %u\n", __func__, cpu); |
| 881 | |
| 882 | if (!policy) |
| 883 | return 0; |
| 884 | |
| 885 | cpu_dev = get_cpu_device(cpu); |
| 886 | if (WARN_ON(!cpu_dev)) |
| 887 | return 0; |
| 888 | |
| 889 | return sysfs_create_link(&cpu_dev->kobj, &policy->kobj, "cpufreq"); |
| 890 | } |
| 891 | |
| 892 | static void remove_cpu_dev_symlink(struct cpufreq_policy *policy, int cpu) |
| 893 | { |
| 894 | struct device *cpu_dev; |
| 895 | |
| 896 | pr_debug("%s: Removing symlink for CPU: %u\n", __func__, cpu); |
| 897 | |
| 898 | cpu_dev = get_cpu_device(cpu); |
| 899 | if (WARN_ON(!cpu_dev)) |
| 900 | return; |
| 901 | |
| 902 | sysfs_remove_link(&cpu_dev->kobj, "cpufreq"); |
| 903 | } |
| 904 | |
| 905 | /* Add/remove symlinks for all related CPUs */ |
Viresh Kumar | 308b60e | 2013-07-31 14:35:14 +0200 | [diff] [blame] | 906 | static int cpufreq_add_dev_symlink(struct cpufreq_policy *policy) |
Dave Jones | 19d6f7e | 2009-07-08 17:35:39 -0400 | [diff] [blame] | 907 | { |
| 908 | unsigned int j; |
| 909 | int ret = 0; |
| 910 | |
Viresh Kumar | 8754914 | 2015-06-10 02:13:21 +0200 | [diff] [blame] | 911 | /* Some related CPUs might not be present (physically hotplugged) */ |
Rafael J. Wysocki | 559ed40 | 2015-07-26 02:07:47 +0200 | [diff] [blame] | 912 | for_each_cpu(j, policy->real_cpus) { |
Viresh Kumar | 8754914 | 2015-06-10 02:13:21 +0200 | [diff] [blame] | 913 | ret = add_cpu_dev_symlink(policy, j); |
Rafael J. Wysocki | 71c3461 | 2013-08-04 01:19:34 +0200 | [diff] [blame] | 914 | if (ret) |
| 915 | break; |
Dave Jones | 19d6f7e | 2009-07-08 17:35:39 -0400 | [diff] [blame] | 916 | } |
Viresh Kumar | 8754914 | 2015-06-10 02:13:21 +0200 | [diff] [blame] | 917 | |
Dave Jones | 19d6f7e | 2009-07-08 17:35:39 -0400 | [diff] [blame] | 918 | return ret; |
| 919 | } |
| 920 | |
Viresh Kumar | 8754914 | 2015-06-10 02:13:21 +0200 | [diff] [blame] | 921 | static void cpufreq_remove_dev_symlink(struct cpufreq_policy *policy) |
| 922 | { |
| 923 | unsigned int j; |
| 924 | |
| 925 | /* Some related CPUs might not be present (physically hotplugged) */ |
Viresh Kumar | 96bdda6 | 2015-10-15 21:35:24 +0530 | [diff] [blame] | 926 | for_each_cpu(j, policy->real_cpus) |
Viresh Kumar | 8754914 | 2015-06-10 02:13:21 +0200 | [diff] [blame] | 927 | remove_cpu_dev_symlink(policy, j); |
Viresh Kumar | 8754914 | 2015-06-10 02:13:21 +0200 | [diff] [blame] | 928 | } |
| 929 | |
Rafael J. Wysocki | d9612a4 | 2015-07-27 23:11:37 +0200 | [diff] [blame] | 930 | static int cpufreq_add_dev_interface(struct cpufreq_policy *policy) |
Dave Jones | 909a694 | 2009-07-08 18:05:42 -0400 | [diff] [blame] | 931 | { |
| 932 | struct freq_attr **drv_attr; |
Dave Jones | 909a694 | 2009-07-08 18:05:42 -0400 | [diff] [blame] | 933 | int ret = 0; |
Dave Jones | 909a694 | 2009-07-08 18:05:42 -0400 | [diff] [blame] | 934 | |
Dave Jones | 909a694 | 2009-07-08 18:05:42 -0400 | [diff] [blame] | 935 | /* set up files for this cpu device */ |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 936 | drv_attr = cpufreq_driver->attr; |
Viresh Kumar | f13f118 | 2015-01-02 12:34:23 +0530 | [diff] [blame] | 937 | while (drv_attr && *drv_attr) { |
Dave Jones | 909a694 | 2009-07-08 18:05:42 -0400 | [diff] [blame] | 938 | ret = sysfs_create_file(&policy->kobj, &((*drv_attr)->attr)); |
| 939 | if (ret) |
Tomeu Vizoso | 6d4e81e | 2014-11-24 10:08:03 +0100 | [diff] [blame] | 940 | return ret; |
Dave Jones | 909a694 | 2009-07-08 18:05:42 -0400 | [diff] [blame] | 941 | drv_attr++; |
| 942 | } |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 943 | if (cpufreq_driver->get) { |
Dave Jones | 909a694 | 2009-07-08 18:05:42 -0400 | [diff] [blame] | 944 | ret = sysfs_create_file(&policy->kobj, &cpuinfo_cur_freq.attr); |
| 945 | if (ret) |
Tomeu Vizoso | 6d4e81e | 2014-11-24 10:08:03 +0100 | [diff] [blame] | 946 | return ret; |
Dave Jones | 909a694 | 2009-07-08 18:05:42 -0400 | [diff] [blame] | 947 | } |
Dirk Brandewie | c034b02 | 2014-10-13 08:37:40 -0700 | [diff] [blame] | 948 | |
| 949 | ret = sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr); |
| 950 | if (ret) |
Tomeu Vizoso | 6d4e81e | 2014-11-24 10:08:03 +0100 | [diff] [blame] | 951 | return ret; |
Dirk Brandewie | c034b02 | 2014-10-13 08:37:40 -0700 | [diff] [blame] | 952 | |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 953 | if (cpufreq_driver->bios_limit) { |
Thomas Renninger | e2f74f3 | 2009-11-19 12:31:01 +0100 | [diff] [blame] | 954 | ret = sysfs_create_file(&policy->kobj, &bios_limit.attr); |
| 955 | if (ret) |
Tomeu Vizoso | 6d4e81e | 2014-11-24 10:08:03 +0100 | [diff] [blame] | 956 | return ret; |
Thomas Renninger | e2f74f3 | 2009-11-19 12:31:01 +0100 | [diff] [blame] | 957 | } |
Dave Jones | 909a694 | 2009-07-08 18:05:42 -0400 | [diff] [blame] | 958 | |
Tomeu Vizoso | 6d4e81e | 2014-11-24 10:08:03 +0100 | [diff] [blame] | 959 | return cpufreq_add_dev_symlink(policy); |
Srivatsa S. Bhat | e18f168 | 2013-07-30 04:24:23 +0530 | [diff] [blame] | 960 | } |
| 961 | |
Viresh Kumar | 7f0fa40 | 2015-07-08 15:12:16 +0530 | [diff] [blame] | 962 | static int cpufreq_init_policy(struct cpufreq_policy *policy) |
Srivatsa S. Bhat | e18f168 | 2013-07-30 04:24:23 +0530 | [diff] [blame] | 963 | { |
viresh kumar | 6e2c89d | 2014-03-04 11:43:59 +0800 | [diff] [blame] | 964 | struct cpufreq_governor *gov = NULL; |
Srivatsa S. Bhat | e18f168 | 2013-07-30 04:24:23 +0530 | [diff] [blame] | 965 | struct cpufreq_policy new_policy; |
Srivatsa S. Bhat | e18f168 | 2013-07-30 04:24:23 +0530 | [diff] [blame] | 966 | |
Viresh Kumar | d5b73cd | 2013-08-06 22:53:06 +0530 | [diff] [blame] | 967 | memcpy(&new_policy, policy, sizeof(*policy)); |
Jason Baron | a27a9ab | 2013-12-19 22:50:50 +0000 | [diff] [blame] | 968 | |
viresh kumar | 6e2c89d | 2014-03-04 11:43:59 +0800 | [diff] [blame] | 969 | /* Update governor of new_policy to the governor used before hotplug */ |
Viresh Kumar | 4573237 | 2015-05-12 12:22:34 +0530 | [diff] [blame] | 970 | gov = find_governor(policy->last_governor); |
viresh kumar | 6e2c89d | 2014-03-04 11:43:59 +0800 | [diff] [blame] | 971 | if (gov) |
| 972 | pr_debug("Restoring governor %s for cpu %d\n", |
| 973 | policy->governor->name, policy->cpu); |
| 974 | else |
| 975 | gov = CPUFREQ_DEFAULT_GOVERNOR; |
| 976 | |
| 977 | new_policy.governor = gov; |
| 978 | |
Jason Baron | a27a9ab | 2013-12-19 22:50:50 +0000 | [diff] [blame] | 979 | /* Use the default policy if its valid. */ |
| 980 | if (cpufreq_driver->setpolicy) |
viresh kumar | 6e2c89d | 2014-03-04 11:43:59 +0800 | [diff] [blame] | 981 | cpufreq_parse_governor(gov->name, &new_policy.policy, NULL); |
Dave Jones | ecf7e46 | 2009-07-08 18:48:47 -0400 | [diff] [blame] | 982 | |
| 983 | /* set default policy */ |
Viresh Kumar | 7f0fa40 | 2015-07-08 15:12:16 +0530 | [diff] [blame] | 984 | return cpufreq_set_policy(policy, &new_policy); |
Dave Jones | 909a694 | 2009-07-08 18:05:42 -0400 | [diff] [blame] | 985 | } |
| 986 | |
Rafael J. Wysocki | d9612a4 | 2015-07-27 23:11:37 +0200 | [diff] [blame] | 987 | static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, unsigned int cpu) |
Viresh Kumar | fcf8058 | 2013-01-29 14:39:08 +0000 | [diff] [blame] | 988 | { |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 989 | int ret = 0; |
Viresh Kumar | fcf8058 | 2013-01-29 14:39:08 +0000 | [diff] [blame] | 990 | |
Viresh Kumar | bb29ae1 | 2015-02-19 17:02:06 +0530 | [diff] [blame] | 991 | /* Has this CPU been taken care of already? */ |
| 992 | if (cpumask_test_cpu(cpu, policy->cpus)) |
| 993 | return 0; |
| 994 | |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 995 | if (has_target()) { |
Viresh Kumar | 3de9bde | 2013-08-06 22:53:13 +0530 | [diff] [blame] | 996 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP); |
| 997 | if (ret) { |
| 998 | pr_err("%s: Failed to stop governor\n", __func__); |
| 999 | return ret; |
| 1000 | } |
| 1001 | } |
Viresh Kumar | fcf8058 | 2013-01-29 14:39:08 +0000 | [diff] [blame] | 1002 | |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 1003 | down_write(&policy->rwsem); |
Viresh Kumar | fcf8058 | 2013-01-29 14:39:08 +0000 | [diff] [blame] | 1004 | cpumask_set_cpu(cpu, policy->cpus); |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 1005 | up_write(&policy->rwsem); |
Viresh Kumar | 2eaa3e2 | 2013-02-07 10:55:00 +0530 | [diff] [blame] | 1006 | |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 1007 | if (has_target()) { |
Stratos Karafotis | e5c87b7 | 2014-03-19 23:29:17 +0200 | [diff] [blame] | 1008 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_START); |
| 1009 | if (!ret) |
| 1010 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); |
| 1011 | |
| 1012 | if (ret) { |
Viresh Kumar | 3de9bde | 2013-08-06 22:53:13 +0530 | [diff] [blame] | 1013 | pr_err("%s: Failed to start governor\n", __func__); |
| 1014 | return ret; |
| 1015 | } |
Viresh Kumar | 820c6ca | 2013-04-22 00:48:03 +0200 | [diff] [blame] | 1016 | } |
Viresh Kumar | fcf8058 | 2013-01-29 14:39:08 +0000 | [diff] [blame] | 1017 | |
Viresh Kumar | 8754914 | 2015-06-10 02:13:21 +0200 | [diff] [blame] | 1018 | return 0; |
Viresh Kumar | fcf8058 | 2013-01-29 14:39:08 +0000 | [diff] [blame] | 1019 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | |
Rafael J. Wysocki | a34e63b | 2015-07-27 23:11:50 +0200 | [diff] [blame] | 1021 | static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu) |
Srivatsa S. Bhat | 8414809 | 2013-07-30 04:25:10 +0530 | [diff] [blame] | 1022 | { |
Rafael J. Wysocki | a34e63b | 2015-07-27 23:11:50 +0200 | [diff] [blame] | 1023 | struct device *dev = get_cpu_device(cpu); |
Srivatsa S. Bhat | e9698cc | 2013-07-30 04:24:11 +0530 | [diff] [blame] | 1024 | struct cpufreq_policy *policy; |
| 1025 | |
Rafael J. Wysocki | a34e63b | 2015-07-27 23:11:50 +0200 | [diff] [blame] | 1026 | if (WARN_ON(!dev)) |
| 1027 | return NULL; |
| 1028 | |
Srivatsa S. Bhat | e9698cc | 2013-07-30 04:24:11 +0530 | [diff] [blame] | 1029 | policy = kzalloc(sizeof(*policy), GFP_KERNEL); |
| 1030 | if (!policy) |
| 1031 | return NULL; |
| 1032 | |
| 1033 | if (!alloc_cpumask_var(&policy->cpus, GFP_KERNEL)) |
| 1034 | goto err_free_policy; |
| 1035 | |
| 1036 | if (!zalloc_cpumask_var(&policy->related_cpus, GFP_KERNEL)) |
| 1037 | goto err_free_cpumask; |
| 1038 | |
Rafael J. Wysocki | 559ed40 | 2015-07-26 02:07:47 +0200 | [diff] [blame] | 1039 | if (!zalloc_cpumask_var(&policy->real_cpus, GFP_KERNEL)) |
| 1040 | goto err_free_rcpumask; |
| 1041 | |
Viresh Kumar | 3510fac | 2015-10-16 12:41:12 +0530 | [diff] [blame] | 1042 | kobject_init(&policy->kobj, &ktype_cpufreq); |
Lukasz Majewski | c88a1f8 | 2013-08-06 22:53:08 +0530 | [diff] [blame] | 1043 | INIT_LIST_HEAD(&policy->policy_list); |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 1044 | init_rwsem(&policy->rwsem); |
Srivatsa S. Bhat | 12478cf | 2014-03-24 13:35:44 +0530 | [diff] [blame] | 1045 | spin_lock_init(&policy->transition_lock); |
| 1046 | init_waitqueue_head(&policy->transition_wait); |
Viresh Kumar | 818c571 | 2015-01-02 12:34:38 +0530 | [diff] [blame] | 1047 | init_completion(&policy->kobj_unregister); |
| 1048 | INIT_WORK(&policy->update, handle_update); |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 1049 | |
Rafael J. Wysocki | a34e63b | 2015-07-27 23:11:50 +0200 | [diff] [blame] | 1050 | policy->cpu = cpu; |
Srivatsa S. Bhat | e9698cc | 2013-07-30 04:24:11 +0530 | [diff] [blame] | 1051 | return policy; |
| 1052 | |
Viresh Kumar | 2fc3384 | 2015-06-08 18:25:29 +0530 | [diff] [blame] | 1053 | err_free_rcpumask: |
| 1054 | free_cpumask_var(policy->related_cpus); |
Srivatsa S. Bhat | e9698cc | 2013-07-30 04:24:11 +0530 | [diff] [blame] | 1055 | err_free_cpumask: |
| 1056 | free_cpumask_var(policy->cpus); |
| 1057 | err_free_policy: |
| 1058 | kfree(policy); |
| 1059 | |
| 1060 | return NULL; |
| 1061 | } |
| 1062 | |
Viresh Kumar | 2fc3384 | 2015-06-08 18:25:29 +0530 | [diff] [blame] | 1063 | static void cpufreq_policy_put_kobj(struct cpufreq_policy *policy, bool notify) |
Viresh Kumar | 42f921a | 2013-12-20 21:26:02 +0530 | [diff] [blame] | 1064 | { |
| 1065 | struct kobject *kobj; |
| 1066 | struct completion *cmp; |
| 1067 | |
Viresh Kumar | 2fc3384 | 2015-06-08 18:25:29 +0530 | [diff] [blame] | 1068 | if (notify) |
| 1069 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
| 1070 | CPUFREQ_REMOVE_POLICY, policy); |
Viresh Kumar | fcd7af9 | 2014-01-07 07:10:10 +0530 | [diff] [blame] | 1071 | |
Viresh Kumar | 8754914 | 2015-06-10 02:13:21 +0200 | [diff] [blame] | 1072 | down_write(&policy->rwsem); |
| 1073 | cpufreq_remove_dev_symlink(policy); |
Viresh Kumar | 42f921a | 2013-12-20 21:26:02 +0530 | [diff] [blame] | 1074 | kobj = &policy->kobj; |
| 1075 | cmp = &policy->kobj_unregister; |
Viresh Kumar | 8754914 | 2015-06-10 02:13:21 +0200 | [diff] [blame] | 1076 | up_write(&policy->rwsem); |
Viresh Kumar | 42f921a | 2013-12-20 21:26:02 +0530 | [diff] [blame] | 1077 | kobject_put(kobj); |
| 1078 | |
| 1079 | /* |
| 1080 | * We need to make sure that the underlying kobj is |
| 1081 | * actually not referenced anymore by anybody before we |
| 1082 | * proceed with unloading. |
| 1083 | */ |
| 1084 | pr_debug("waiting for dropping of refcount\n"); |
| 1085 | wait_for_completion(cmp); |
| 1086 | pr_debug("wait complete\n"); |
| 1087 | } |
| 1088 | |
Viresh Kumar | 3654c5c | 2015-06-08 18:25:30 +0530 | [diff] [blame] | 1089 | static void cpufreq_policy_free(struct cpufreq_policy *policy, bool notify) |
Srivatsa S. Bhat | e9698cc | 2013-07-30 04:24:11 +0530 | [diff] [blame] | 1090 | { |
Viresh Kumar | 988bed0 | 2015-05-08 11:53:45 +0530 | [diff] [blame] | 1091 | unsigned long flags; |
| 1092 | int cpu; |
| 1093 | |
| 1094 | /* Remove policy from list */ |
| 1095 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
| 1096 | list_del(&policy->policy_list); |
| 1097 | |
| 1098 | for_each_cpu(cpu, policy->related_cpus) |
| 1099 | per_cpu(cpufreq_cpu_data, cpu) = NULL; |
| 1100 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
| 1101 | |
Viresh Kumar | 3654c5c | 2015-06-08 18:25:30 +0530 | [diff] [blame] | 1102 | cpufreq_policy_put_kobj(policy, notify); |
Rafael J. Wysocki | 559ed40 | 2015-07-26 02:07:47 +0200 | [diff] [blame] | 1103 | free_cpumask_var(policy->real_cpus); |
Srivatsa S. Bhat | e9698cc | 2013-07-30 04:24:11 +0530 | [diff] [blame] | 1104 | free_cpumask_var(policy->related_cpus); |
| 1105 | free_cpumask_var(policy->cpus); |
| 1106 | kfree(policy); |
| 1107 | } |
| 1108 | |
Rafael J. Wysocki | 0b27535 | 2015-07-29 03:03:44 +0200 | [diff] [blame] | 1109 | static int cpufreq_online(unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | { |
Viresh Kumar | 7f0c020 | 2015-01-02 12:34:32 +0530 | [diff] [blame] | 1111 | struct cpufreq_policy *policy; |
Rafael J. Wysocki | 194d99c | 2015-07-29 03:08:57 +0200 | [diff] [blame] | 1112 | bool new_policy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | unsigned long flags; |
Rafael J. Wysocki | 0b27535 | 2015-07-29 03:03:44 +0200 | [diff] [blame] | 1114 | unsigned int j; |
| 1115 | int ret; |
Ashok Raj | c32b6b8 | 2005-10-30 14:59:54 -0800 | [diff] [blame] | 1116 | |
Rafael J. Wysocki | 0b27535 | 2015-07-29 03:03:44 +0200 | [diff] [blame] | 1117 | pr_debug("%s: bringing CPU%u online\n", __func__, cpu); |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 1118 | |
Viresh Kumar | bb29ae1 | 2015-02-19 17:02:06 +0530 | [diff] [blame] | 1119 | /* Check if this CPU already has a policy to manage it */ |
Viresh Kumar | 9104bb2 | 2015-05-12 12:22:12 +0530 | [diff] [blame] | 1120 | policy = per_cpu(cpufreq_cpu_data, cpu); |
Rafael J. Wysocki | 11ce707 | 2015-07-27 23:11:21 +0200 | [diff] [blame] | 1121 | if (policy) { |
Viresh Kumar | 9104bb2 | 2015-05-12 12:22:12 +0530 | [diff] [blame] | 1122 | WARN_ON(!cpumask_test_cpu(cpu, policy->related_cpus)); |
Rafael J. Wysocki | 11ce707 | 2015-07-27 23:11:21 +0200 | [diff] [blame] | 1123 | if (!policy_is_inactive(policy)) |
Rafael J. Wysocki | d9612a4 | 2015-07-27 23:11:37 +0200 | [diff] [blame] | 1124 | return cpufreq_add_policy_cpu(policy, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | |
Rafael J. Wysocki | 11ce707 | 2015-07-27 23:11:21 +0200 | [diff] [blame] | 1126 | /* This is the only online CPU for the policy. Start over. */ |
Rafael J. Wysocki | 194d99c | 2015-07-29 03:08:57 +0200 | [diff] [blame] | 1127 | new_policy = false; |
Rafael J. Wysocki | 11ce707 | 2015-07-27 23:11:21 +0200 | [diff] [blame] | 1128 | down_write(&policy->rwsem); |
| 1129 | policy->cpu = cpu; |
| 1130 | policy->governor = NULL; |
| 1131 | up_write(&policy->rwsem); |
| 1132 | } else { |
Rafael J. Wysocki | 194d99c | 2015-07-29 03:08:57 +0200 | [diff] [blame] | 1133 | new_policy = true; |
Rafael J. Wysocki | a34e63b | 2015-07-27 23:11:50 +0200 | [diff] [blame] | 1134 | policy = cpufreq_policy_alloc(cpu); |
Rafael J. Wysocki | 72368d1 | 2013-12-27 01:07:11 +0100 | [diff] [blame] | 1135 | if (!policy) |
Rafael J. Wysocki | d4d854d | 2015-07-27 23:11:30 +0200 | [diff] [blame] | 1136 | return -ENOMEM; |
Rafael J. Wysocki | 72368d1 | 2013-12-27 01:07:11 +0100 | [diff] [blame] | 1137 | } |
Srivatsa S. Bhat | 0d66b91 | 2013-09-12 01:42:59 +0530 | [diff] [blame] | 1138 | |
Rusty Russell | 835481d | 2009-01-04 05:18:06 -0800 | [diff] [blame] | 1139 | cpumask_copy(policy->cpus, cpumask_of(cpu)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | /* call driver. From then on the cpufreq must be able |
| 1142 | * to accept all calls to ->verify and ->setpolicy for this CPU |
| 1143 | */ |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 1144 | ret = cpufreq_driver->init(policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | if (ret) { |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 1146 | pr_debug("initialization failed\n"); |
Viresh Kumar | 8101f99 | 2015-07-08 15:12:15 +0530 | [diff] [blame] | 1147 | goto out_free_policy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | } |
Viresh Kumar | 643ae6e | 2013-01-12 05:14:38 +0000 | [diff] [blame] | 1149 | |
Tomeu Vizoso | 6d4e81e | 2014-11-24 10:08:03 +0100 | [diff] [blame] | 1150 | down_write(&policy->rwsem); |
| 1151 | |
Rafael J. Wysocki | 194d99c | 2015-07-29 03:08:57 +0200 | [diff] [blame] | 1152 | if (new_policy) { |
Rafael J. Wysocki | 4d1f3a5 | 2015-07-27 23:11:44 +0200 | [diff] [blame] | 1153 | /* related_cpus should at least include policy->cpus. */ |
Viresh Kumar | 0998a03 | 2015-10-15 21:35:21 +0530 | [diff] [blame] | 1154 | cpumask_copy(policy->related_cpus, policy->cpus); |
Rafael J. Wysocki | 4d1f3a5 | 2015-07-27 23:11:44 +0200 | [diff] [blame] | 1155 | /* Remember CPUs present at the policy creation time. */ |
Rafael J. Wysocki | 559ed40 | 2015-07-26 02:07:47 +0200 | [diff] [blame] | 1156 | cpumask_and(policy->real_cpus, policy->cpus, cpu_present_mask); |
Viresh Kumar | 3510fac | 2015-10-16 12:41:12 +0530 | [diff] [blame] | 1157 | |
| 1158 | /* Name and add the kobject */ |
| 1159 | ret = kobject_add(&policy->kobj, cpufreq_global_kobject, |
| 1160 | "policy%u", |
| 1161 | cpumask_first(policy->related_cpus)); |
| 1162 | if (ret) { |
| 1163 | pr_err("%s: failed to add policy->kobj: %d\n", __func__, |
| 1164 | ret); |
| 1165 | goto out_exit_policy; |
| 1166 | } |
Rafael J. Wysocki | 4d1f3a5 | 2015-07-27 23:11:44 +0200 | [diff] [blame] | 1167 | } |
Rafael J. Wysocki | 559ed40 | 2015-07-26 02:07:47 +0200 | [diff] [blame] | 1168 | |
Viresh Kumar | 5a7e56a | 2014-03-04 11:44:00 +0800 | [diff] [blame] | 1169 | /* |
| 1170 | * affected cpus must always be the one, which are online. We aren't |
| 1171 | * managing offline cpus here. |
| 1172 | */ |
| 1173 | cpumask_and(policy->cpus, policy->cpus, cpu_online_mask); |
| 1174 | |
Rafael J. Wysocki | 194d99c | 2015-07-29 03:08:57 +0200 | [diff] [blame] | 1175 | if (new_policy) { |
Viresh Kumar | 5a7e56a | 2014-03-04 11:44:00 +0800 | [diff] [blame] | 1176 | policy->user_policy.min = policy->min; |
| 1177 | policy->user_policy.max = policy->max; |
Tomeu Vizoso | 6d4e81e | 2014-11-24 10:08:03 +0100 | [diff] [blame] | 1178 | |
Viresh Kumar | 988bed0 | 2015-05-08 11:53:45 +0530 | [diff] [blame] | 1179 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
| 1180 | for_each_cpu(j, policy->related_cpus) |
| 1181 | per_cpu(cpufreq_cpu_data, j) = policy; |
| 1182 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
| 1183 | } |
Viresh Kumar | 652ed95 | 2014-01-09 20:38:43 +0530 | [diff] [blame] | 1184 | |
Rafael J. Wysocki | 2ed99e3 | 2014-03-12 21:49:33 +0100 | [diff] [blame] | 1185 | if (cpufreq_driver->get && !cpufreq_driver->setpolicy) { |
Viresh Kumar | da60ce9 | 2013-10-03 20:28:30 +0530 | [diff] [blame] | 1186 | policy->cur = cpufreq_driver->get(policy->cpu); |
| 1187 | if (!policy->cur) { |
| 1188 | pr_err("%s: ->get() failed\n", __func__); |
Viresh Kumar | 8101f99 | 2015-07-08 15:12:15 +0530 | [diff] [blame] | 1189 | goto out_exit_policy; |
Viresh Kumar | da60ce9 | 2013-10-03 20:28:30 +0530 | [diff] [blame] | 1190 | } |
| 1191 | } |
| 1192 | |
Viresh Kumar | d391669 | 2013-12-03 11:20:46 +0530 | [diff] [blame] | 1193 | /* |
| 1194 | * Sometimes boot loaders set CPU frequency to a value outside of |
| 1195 | * frequency table present with cpufreq core. In such cases CPU might be |
| 1196 | * unstable if it has to run on that frequency for long duration of time |
| 1197 | * and so its better to set it to a frequency which is specified in |
| 1198 | * freq-table. This also makes cpufreq stats inconsistent as |
| 1199 | * cpufreq-stats would fail to register because current frequency of CPU |
| 1200 | * isn't found in freq-table. |
| 1201 | * |
| 1202 | * Because we don't want this change to effect boot process badly, we go |
| 1203 | * for the next freq which is >= policy->cur ('cur' must be set by now, |
| 1204 | * otherwise we will end up setting freq to lowest of the table as 'cur' |
| 1205 | * is initialized to zero). |
| 1206 | * |
| 1207 | * We are passing target-freq as "policy->cur - 1" otherwise |
| 1208 | * __cpufreq_driver_target() would simply fail, as policy->cur will be |
| 1209 | * equal to target-freq. |
| 1210 | */ |
| 1211 | if ((cpufreq_driver->flags & CPUFREQ_NEED_INITIAL_FREQ_CHECK) |
| 1212 | && has_target()) { |
| 1213 | /* Are we running at unknown frequency ? */ |
| 1214 | ret = cpufreq_frequency_table_get_index(policy, policy->cur); |
| 1215 | if (ret == -EINVAL) { |
| 1216 | /* Warn user and fix it */ |
| 1217 | pr_warn("%s: CPU%d: Running at unlisted freq: %u KHz\n", |
| 1218 | __func__, policy->cpu, policy->cur); |
| 1219 | ret = __cpufreq_driver_target(policy, policy->cur - 1, |
| 1220 | CPUFREQ_RELATION_L); |
| 1221 | |
| 1222 | /* |
| 1223 | * Reaching here after boot in a few seconds may not |
| 1224 | * mean that system will remain stable at "unknown" |
| 1225 | * frequency for longer duration. Hence, a BUG_ON(). |
| 1226 | */ |
| 1227 | BUG_ON(ret); |
| 1228 | pr_warn("%s: CPU%d: Unlisted initial frequency changed to: %u KHz\n", |
| 1229 | __func__, policy->cpu, policy->cur); |
| 1230 | } |
| 1231 | } |
| 1232 | |
Thomas Renninger | a1531ac | 2008-07-29 22:32:58 -0700 | [diff] [blame] | 1233 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
| 1234 | CPUFREQ_START, policy); |
| 1235 | |
Rafael J. Wysocki | 194d99c | 2015-07-29 03:08:57 +0200 | [diff] [blame] | 1236 | if (new_policy) { |
Rafael J. Wysocki | d9612a4 | 2015-07-27 23:11:37 +0200 | [diff] [blame] | 1237 | ret = cpufreq_add_dev_interface(policy); |
Srivatsa S. Bhat | a82fab2 | 2013-07-30 04:24:49 +0530 | [diff] [blame] | 1238 | if (ret) |
Viresh Kumar | 8101f99 | 2015-07-08 15:12:15 +0530 | [diff] [blame] | 1239 | goto out_exit_policy; |
Viresh Kumar | fcd7af9 | 2014-01-07 07:10:10 +0530 | [diff] [blame] | 1240 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
| 1241 | CPUFREQ_CREATE_POLICY, policy); |
Dave Jones | 8ff6973 | 2006-03-05 03:37:23 -0500 | [diff] [blame] | 1242 | |
Viresh Kumar | 988bed0 | 2015-05-08 11:53:45 +0530 | [diff] [blame] | 1243 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
| 1244 | list_add(&policy->policy_list, &cpufreq_policy_list); |
| 1245 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
| 1246 | } |
Viresh Kumar | 9515f4d | 2013-08-20 12:08:23 +0530 | [diff] [blame] | 1247 | |
Viresh Kumar | 7f0fa40 | 2015-07-08 15:12:16 +0530 | [diff] [blame] | 1248 | ret = cpufreq_init_policy(policy); |
| 1249 | if (ret) { |
| 1250 | pr_err("%s: Failed to initialize policy for cpu: %d (%d)\n", |
| 1251 | __func__, cpu, ret); |
Rafael J. Wysocki | 194d99c | 2015-07-29 03:08:57 +0200 | [diff] [blame] | 1252 | /* cpufreq_policy_free() will notify based on this */ |
| 1253 | new_policy = false; |
| 1254 | goto out_exit_policy; |
Viresh Kumar | 08fd8c1c | 2013-12-24 07:11:01 +0530 | [diff] [blame] | 1255 | } |
Srivatsa S. Bhat | e18f168 | 2013-07-30 04:24:23 +0530 | [diff] [blame] | 1256 | |
Viresh Kumar | 4e97b63 | 2014-03-04 11:44:01 +0800 | [diff] [blame] | 1257 | up_write(&policy->rwsem); |
Viresh Kumar | 08fd8c1c | 2013-12-24 07:11:01 +0530 | [diff] [blame] | 1258 | |
Greg Kroah-Hartman | 038c5b3 | 2007-12-17 15:54:39 -0400 | [diff] [blame] | 1259 | kobject_uevent(&policy->kobj, KOBJ_ADD); |
Viresh Kumar | 7c45cf3 | 2014-11-27 06:07:51 +0530 | [diff] [blame] | 1260 | |
Viresh Kumar | 7c45cf3 | 2014-11-27 06:07:51 +0530 | [diff] [blame] | 1261 | /* Callback for handling stuff after policy is ready */ |
| 1262 | if (cpufreq_driver->ready) |
| 1263 | cpufreq_driver->ready(policy); |
| 1264 | |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 1265 | pr_debug("initialization complete\n"); |
Dave Jones | 87c3227 | 2006-03-29 01:48:37 -0500 | [diff] [blame] | 1266 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | return 0; |
| 1268 | |
Viresh Kumar | 8101f99 | 2015-07-08 15:12:15 +0530 | [diff] [blame] | 1269 | out_exit_policy: |
Prarit Bhargava | 7106e02 | 2014-09-10 10:12:08 -0400 | [diff] [blame] | 1270 | up_write(&policy->rwsem); |
| 1271 | |
Viresh Kumar | da60ce9 | 2013-10-03 20:28:30 +0530 | [diff] [blame] | 1272 | if (cpufreq_driver->exit) |
| 1273 | cpufreq_driver->exit(policy); |
Viresh Kumar | 8101f99 | 2015-07-08 15:12:15 +0530 | [diff] [blame] | 1274 | out_free_policy: |
Rafael J. Wysocki | 194d99c | 2015-07-29 03:08:57 +0200 | [diff] [blame] | 1275 | cpufreq_policy_free(policy, !new_policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | return ret; |
| 1277 | } |
| 1278 | |
Rafael J. Wysocki | 0b27535 | 2015-07-29 03:03:44 +0200 | [diff] [blame] | 1279 | /** |
| 1280 | * cpufreq_add_dev - the cpufreq interface for a CPU device. |
| 1281 | * @dev: CPU device. |
| 1282 | * @sif: Subsystem interface structure pointer (not used) |
| 1283 | */ |
| 1284 | static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) |
| 1285 | { |
| 1286 | unsigned cpu = dev->id; |
| 1287 | int ret; |
| 1288 | |
| 1289 | dev_dbg(dev, "%s: adding CPU%u\n", __func__, cpu); |
| 1290 | |
| 1291 | if (cpu_online(cpu)) { |
| 1292 | ret = cpufreq_online(cpu); |
| 1293 | } else { |
| 1294 | /* |
| 1295 | * A hotplug notifier will follow and we will handle it as CPU |
| 1296 | * online then. For now, just create the sysfs link, unless |
| 1297 | * there is no policy or the link is already present. |
| 1298 | */ |
| 1299 | struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); |
| 1300 | |
| 1301 | ret = policy && !cpumask_test_and_set_cpu(cpu, policy->real_cpus) |
| 1302 | ? add_cpu_dev_symlink(policy, cpu) : 0; |
| 1303 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1304 | |
| 1305 | return ret; |
| 1306 | } |
| 1307 | |
Rafael J. Wysocki | 15c0b4d | 2015-07-27 23:11:09 +0200 | [diff] [blame] | 1308 | static void cpufreq_offline_prepare(unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | { |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 1310 | struct cpufreq_policy *policy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | |
Viresh Kumar | b8eed8a | 2013-01-14 13:23:03 +0000 | [diff] [blame] | 1312 | pr_debug("%s: unregistering CPU %u\n", __func__, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | |
Viresh Kumar | 988bed0 | 2015-05-08 11:53:45 +0530 | [diff] [blame] | 1314 | policy = cpufreq_cpu_get_raw(cpu); |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 1315 | if (!policy) { |
Viresh Kumar | b8eed8a | 2013-01-14 13:23:03 +0000 | [diff] [blame] | 1316 | pr_debug("%s: No cpu_data found\n", __func__); |
Rafael J. Wysocki | 15c0b4d | 2015-07-27 23:11:09 +0200 | [diff] [blame] | 1317 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 1320 | if (has_target()) { |
Rafael J. Wysocki | 15c0b4d | 2015-07-27 23:11:09 +0200 | [diff] [blame] | 1321 | int ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP); |
Rafael J. Wysocki | 559ed40 | 2015-07-26 02:07:47 +0200 | [diff] [blame] | 1322 | if (ret) |
Viresh Kumar | 3de9bde | 2013-08-06 22:53:13 +0530 | [diff] [blame] | 1323 | pr_err("%s: Failed to stop governor\n", __func__); |
Viresh Kumar | db5f299 | 2015-01-02 12:34:25 +0530 | [diff] [blame] | 1324 | } |
Jacob Shin | 27ecddc | 2011-04-27 13:32:11 -0500 | [diff] [blame] | 1325 | |
Viresh Kumar | 4573237 | 2015-05-12 12:22:34 +0530 | [diff] [blame] | 1326 | down_write(&policy->rwsem); |
Viresh Kumar | 9591bec | 2015-06-10 02:20:23 +0200 | [diff] [blame] | 1327 | cpumask_clear_cpu(cpu, policy->cpus); |
Viresh Kumar | 4573237 | 2015-05-12 12:22:34 +0530 | [diff] [blame] | 1328 | |
Viresh Kumar | 9591bec | 2015-06-10 02:20:23 +0200 | [diff] [blame] | 1329 | if (policy_is_inactive(policy)) { |
| 1330 | if (has_target()) |
| 1331 | strncpy(policy->last_governor, policy->governor->name, |
| 1332 | CPUFREQ_NAME_LEN); |
| 1333 | } else if (cpu == policy->cpu) { |
| 1334 | /* Nominate new CPU */ |
| 1335 | policy->cpu = cpumask_any(policy->cpus); |
| 1336 | } |
Viresh Kumar | 4573237 | 2015-05-12 12:22:34 +0530 | [diff] [blame] | 1337 | up_write(&policy->rwsem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | |
Viresh Kumar | 9591bec | 2015-06-10 02:20:23 +0200 | [diff] [blame] | 1339 | /* Start governor again for active policy */ |
| 1340 | if (!policy_is_inactive(policy)) { |
| 1341 | if (has_target()) { |
Rafael J. Wysocki | 15c0b4d | 2015-07-27 23:11:09 +0200 | [diff] [blame] | 1342 | int ret = __cpufreq_governor(policy, CPUFREQ_GOV_START); |
Viresh Kumar | 9591bec | 2015-06-10 02:20:23 +0200 | [diff] [blame] | 1343 | if (!ret) |
| 1344 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); |
Viresh Kumar | 8754914 | 2015-06-10 02:13:21 +0200 | [diff] [blame] | 1345 | |
Viresh Kumar | 9591bec | 2015-06-10 02:20:23 +0200 | [diff] [blame] | 1346 | if (ret) |
| 1347 | pr_err("%s: Failed to start governor\n", __func__); |
| 1348 | } |
| 1349 | } else if (cpufreq_driver->stop_cpu) { |
Dirk Brandewie | 367dc4a | 2014-03-19 08:45:53 -0700 | [diff] [blame] | 1350 | cpufreq_driver->stop_cpu(policy); |
Viresh Kumar | 9591bec | 2015-06-10 02:20:23 +0200 | [diff] [blame] | 1351 | } |
Srivatsa S. Bhat | cedb70a | 2013-09-07 01:23:09 +0530 | [diff] [blame] | 1352 | } |
| 1353 | |
Rafael J. Wysocki | 15c0b4d | 2015-07-27 23:11:09 +0200 | [diff] [blame] | 1354 | static void cpufreq_offline_finish(unsigned int cpu) |
Srivatsa S. Bhat | cedb70a | 2013-09-07 01:23:09 +0530 | [diff] [blame] | 1355 | { |
Viresh Kumar | 9591bec | 2015-06-10 02:20:23 +0200 | [diff] [blame] | 1356 | struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); |
Srivatsa S. Bhat | cedb70a | 2013-09-07 01:23:09 +0530 | [diff] [blame] | 1357 | |
| 1358 | if (!policy) { |
| 1359 | pr_debug("%s: No cpu_data found\n", __func__); |
Rafael J. Wysocki | 15c0b4d | 2015-07-27 23:11:09 +0200 | [diff] [blame] | 1360 | return; |
Srivatsa S. Bhat | cedb70a | 2013-09-07 01:23:09 +0530 | [diff] [blame] | 1361 | } |
| 1362 | |
Viresh Kumar | 9591bec | 2015-06-10 02:20:23 +0200 | [diff] [blame] | 1363 | /* Only proceed for inactive policies */ |
| 1364 | if (!policy_is_inactive(policy)) |
Rafael J. Wysocki | 15c0b4d | 2015-07-27 23:11:09 +0200 | [diff] [blame] | 1365 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | |
Viresh Kumar | 8754914 | 2015-06-10 02:13:21 +0200 | [diff] [blame] | 1367 | /* If cpu is last user of policy, free policy */ |
| 1368 | if (has_target()) { |
Rafael J. Wysocki | 15c0b4d | 2015-07-27 23:11:09 +0200 | [diff] [blame] | 1369 | int ret = __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); |
Rafael J. Wysocki | 559ed40 | 2015-07-26 02:07:47 +0200 | [diff] [blame] | 1370 | if (ret) |
Viresh Kumar | 8754914 | 2015-06-10 02:13:21 +0200 | [diff] [blame] | 1371 | pr_err("%s: Failed to exit governor\n", __func__); |
Viresh Kumar | 8754914 | 2015-06-10 02:13:21 +0200 | [diff] [blame] | 1372 | } |
| 1373 | |
Viresh Kumar | 8754914 | 2015-06-10 02:13:21 +0200 | [diff] [blame] | 1374 | /* |
| 1375 | * Perform the ->exit() even during light-weight tear-down, |
| 1376 | * since this is a core component, and is essential for the |
| 1377 | * subsequent light-weight ->init() to succeed. |
| 1378 | */ |
Srinivas Pandruvada | 55582bc | 2015-10-07 13:50:44 -0700 | [diff] [blame] | 1379 | if (cpufreq_driver->exit) { |
Viresh Kumar | 8754914 | 2015-06-10 02:13:21 +0200 | [diff] [blame] | 1380 | cpufreq_driver->exit(policy); |
Srinivas Pandruvada | 55582bc | 2015-10-07 13:50:44 -0700 | [diff] [blame] | 1381 | policy->freq_table = NULL; |
| 1382 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | } |
| 1384 | |
Srivatsa S. Bhat | cedb70a | 2013-09-07 01:23:09 +0530 | [diff] [blame] | 1385 | /** |
Viresh Kumar | 27a862e | 2013-10-02 14:13:14 +0530 | [diff] [blame] | 1386 | * cpufreq_remove_dev - remove a CPU device |
Srivatsa S. Bhat | cedb70a | 2013-09-07 01:23:09 +0530 | [diff] [blame] | 1387 | * |
| 1388 | * Removes the cpufreq interface for a CPU device. |
Srivatsa S. Bhat | cedb70a | 2013-09-07 01:23:09 +0530 | [diff] [blame] | 1389 | */ |
Viresh Kumar | 71db87b | 2015-07-30 15:04:01 +0530 | [diff] [blame] | 1390 | static void cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif) |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 1391 | { |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 1392 | unsigned int cpu = dev->id; |
Rafael J. Wysocki | 559ed40 | 2015-07-26 02:07:47 +0200 | [diff] [blame] | 1393 | struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); |
Venki Pallipadi | ec28297 | 2007-03-26 12:03:19 -0700 | [diff] [blame] | 1394 | |
Rafael J. Wysocki | 559ed40 | 2015-07-26 02:07:47 +0200 | [diff] [blame] | 1395 | if (!policy) |
Linus Torvalds | 1af115d | 2015-08-31 08:47:40 -0700 | [diff] [blame] | 1396 | return; |
Viresh Kumar | 8754914 | 2015-06-10 02:13:21 +0200 | [diff] [blame] | 1397 | |
Rafael J. Wysocki | 559ed40 | 2015-07-26 02:07:47 +0200 | [diff] [blame] | 1398 | if (cpu_online(cpu)) { |
Rafael J. Wysocki | 15c0b4d | 2015-07-27 23:11:09 +0200 | [diff] [blame] | 1399 | cpufreq_offline_prepare(cpu); |
| 1400 | cpufreq_offline_finish(cpu); |
Rafael J. Wysocki | 559ed40 | 2015-07-26 02:07:47 +0200 | [diff] [blame] | 1401 | } |
Viresh Kumar | 8754914 | 2015-06-10 02:13:21 +0200 | [diff] [blame] | 1402 | |
Rafael J. Wysocki | 559ed40 | 2015-07-26 02:07:47 +0200 | [diff] [blame] | 1403 | cpumask_clear_cpu(cpu, policy->real_cpus); |
Viresh Kumar | 8754914 | 2015-06-10 02:13:21 +0200 | [diff] [blame] | 1404 | |
Rafael J. Wysocki | 559ed40 | 2015-07-26 02:07:47 +0200 | [diff] [blame] | 1405 | if (cpumask_empty(policy->real_cpus)) { |
Viresh Kumar | 3654c5c | 2015-06-08 18:25:30 +0530 | [diff] [blame] | 1406 | cpufreq_policy_free(policy, true); |
Viresh Kumar | 71db87b | 2015-07-30 15:04:01 +0530 | [diff] [blame] | 1407 | return; |
Viresh Kumar | 8754914 | 2015-06-10 02:13:21 +0200 | [diff] [blame] | 1408 | } |
Venki Pallipadi | ec28297 | 2007-03-26 12:03:19 -0700 | [diff] [blame] | 1409 | |
Viresh Kumar | 96bdda6 | 2015-10-15 21:35:24 +0530 | [diff] [blame] | 1410 | remove_cpu_dev_symlink(policy, cpu); |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 1411 | } |
| 1412 | |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 1413 | static void handle_update(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | { |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 1415 | struct cpufreq_policy *policy = |
| 1416 | container_of(work, struct cpufreq_policy, update); |
| 1417 | unsigned int cpu = policy->cpu; |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 1418 | pr_debug("handle_update for cpu %u called\n", cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | cpufreq_update_policy(cpu); |
| 1420 | } |
| 1421 | |
| 1422 | /** |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 1423 | * cpufreq_out_of_sync - If actual and saved CPU frequency differs, we're |
| 1424 | * in deep trouble. |
Viresh Kumar | a1e1dc4 | 2015-01-02 12:34:28 +0530 | [diff] [blame] | 1425 | * @policy: policy managing CPUs |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | * @new_freq: CPU frequency the CPU actually runs at |
| 1427 | * |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 1428 | * We adjust to current frequency first, and need to clean up later. |
| 1429 | * So either call to cpufreq_update_policy() or schedule handle_update()). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | */ |
Viresh Kumar | a1e1dc4 | 2015-01-02 12:34:28 +0530 | [diff] [blame] | 1431 | static void cpufreq_out_of_sync(struct cpufreq_policy *policy, |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 1432 | unsigned int new_freq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1433 | { |
| 1434 | struct cpufreq_freqs freqs; |
Viresh Kumar | b43a7ff | 2013-03-24 11:56:43 +0530 | [diff] [blame] | 1435 | |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 1436 | pr_debug("Warning: CPU frequency out of sync: cpufreq and timing core thinks of %u, is %u kHz\n", |
Viresh Kumar | a1e1dc4 | 2015-01-02 12:34:28 +0530 | [diff] [blame] | 1437 | policy->cur, new_freq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | |
Viresh Kumar | a1e1dc4 | 2015-01-02 12:34:28 +0530 | [diff] [blame] | 1439 | freqs.old = policy->cur; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | freqs.new = new_freq; |
Viresh Kumar | b43a7ff | 2013-03-24 11:56:43 +0530 | [diff] [blame] | 1441 | |
Viresh Kumar | 8fec051 | 2014-03-24 13:35:45 +0530 | [diff] [blame] | 1442 | cpufreq_freq_transition_begin(policy, &freqs); |
| 1443 | cpufreq_freq_transition_end(policy, &freqs, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | } |
| 1445 | |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 1446 | /** |
Dhaval Giani | 4ab70df | 2006-12-13 14:49:15 +0530 | [diff] [blame] | 1447 | * cpufreq_quick_get - get the CPU frequency (in kHz) from policy->cur |
Venkatesh Pallipadi | 95235ca | 2005-12-02 10:43:20 -0800 | [diff] [blame] | 1448 | * @cpu: CPU number |
| 1449 | * |
| 1450 | * This is the last known freq, without actually getting it from the driver. |
| 1451 | * Return value will be same as what is shown in scaling_cur_freq in sysfs. |
| 1452 | */ |
| 1453 | unsigned int cpufreq_quick_get(unsigned int cpu) |
| 1454 | { |
Dirk Brandewie | 9e21ba8 | 2013-02-06 09:02:08 -0800 | [diff] [blame] | 1455 | struct cpufreq_policy *policy; |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 1456 | unsigned int ret_freq = 0; |
Venkatesh Pallipadi | 95235ca | 2005-12-02 10:43:20 -0800 | [diff] [blame] | 1457 | |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 1458 | if (cpufreq_driver && cpufreq_driver->setpolicy && cpufreq_driver->get) |
| 1459 | return cpufreq_driver->get(cpu); |
Dirk Brandewie | 9e21ba8 | 2013-02-06 09:02:08 -0800 | [diff] [blame] | 1460 | |
| 1461 | policy = cpufreq_cpu_get(cpu); |
Venkatesh Pallipadi | 95235ca | 2005-12-02 10:43:20 -0800 | [diff] [blame] | 1462 | if (policy) { |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 1463 | ret_freq = policy->cur; |
Venkatesh Pallipadi | 95235ca | 2005-12-02 10:43:20 -0800 | [diff] [blame] | 1464 | cpufreq_cpu_put(policy); |
| 1465 | } |
| 1466 | |
Dave Jones | 4d34a67 | 2008-02-07 16:33:49 -0500 | [diff] [blame] | 1467 | return ret_freq; |
Venkatesh Pallipadi | 95235ca | 2005-12-02 10:43:20 -0800 | [diff] [blame] | 1468 | } |
| 1469 | EXPORT_SYMBOL(cpufreq_quick_get); |
| 1470 | |
Jesse Barnes | 3d73710 | 2011-06-28 10:59:12 -0700 | [diff] [blame] | 1471 | /** |
| 1472 | * cpufreq_quick_get_max - get the max reported CPU frequency for this CPU |
| 1473 | * @cpu: CPU number |
| 1474 | * |
| 1475 | * Just return the max possible frequency for a given CPU. |
| 1476 | */ |
| 1477 | unsigned int cpufreq_quick_get_max(unsigned int cpu) |
| 1478 | { |
| 1479 | struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); |
| 1480 | unsigned int ret_freq = 0; |
| 1481 | |
| 1482 | if (policy) { |
| 1483 | ret_freq = policy->max; |
| 1484 | cpufreq_cpu_put(policy); |
| 1485 | } |
| 1486 | |
| 1487 | return ret_freq; |
| 1488 | } |
| 1489 | EXPORT_SYMBOL(cpufreq_quick_get_max); |
| 1490 | |
Viresh Kumar | d92d50a | 2015-01-02 12:34:29 +0530 | [diff] [blame] | 1491 | static unsigned int __cpufreq_get(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | { |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 1493 | unsigned int ret_freq = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 1495 | if (!cpufreq_driver->get) |
Dave Jones | 4d34a67 | 2008-02-07 16:33:49 -0500 | [diff] [blame] | 1496 | return ret_freq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1497 | |
Viresh Kumar | d92d50a | 2015-01-02 12:34:29 +0530 | [diff] [blame] | 1498 | ret_freq = cpufreq_driver->get(policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1499 | |
Viresh Kumar | 11e584c | 2015-06-10 02:11:45 +0200 | [diff] [blame] | 1500 | /* Updating inactive policies is invalid, so avoid doing that. */ |
| 1501 | if (unlikely(policy_is_inactive(policy))) |
| 1502 | return ret_freq; |
| 1503 | |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 1504 | if (ret_freq && policy->cur && |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 1505 | !(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) { |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 1506 | /* verify no discrepancy between actual and |
| 1507 | saved value exists */ |
| 1508 | if (unlikely(ret_freq != policy->cur)) { |
Viresh Kumar | a1e1dc4 | 2015-01-02 12:34:28 +0530 | [diff] [blame] | 1509 | cpufreq_out_of_sync(policy, ret_freq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1510 | schedule_work(&policy->update); |
| 1511 | } |
| 1512 | } |
| 1513 | |
Dave Jones | 4d34a67 | 2008-02-07 16:33:49 -0500 | [diff] [blame] | 1514 | return ret_freq; |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 1515 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 1517 | /** |
| 1518 | * cpufreq_get - get the current CPU frequency (in kHz) |
| 1519 | * @cpu: CPU number |
| 1520 | * |
| 1521 | * Get the CPU current (static) CPU frequency |
| 1522 | */ |
| 1523 | unsigned int cpufreq_get(unsigned int cpu) |
| 1524 | { |
Aaron Plattner | 999976e | 2014-03-04 12:42:15 -0800 | [diff] [blame] | 1525 | struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 1526 | unsigned int ret_freq = 0; |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 1527 | |
Aaron Plattner | 999976e | 2014-03-04 12:42:15 -0800 | [diff] [blame] | 1528 | if (policy) { |
| 1529 | down_read(&policy->rwsem); |
Viresh Kumar | d92d50a | 2015-01-02 12:34:29 +0530 | [diff] [blame] | 1530 | ret_freq = __cpufreq_get(policy); |
Aaron Plattner | 999976e | 2014-03-04 12:42:15 -0800 | [diff] [blame] | 1531 | up_read(&policy->rwsem); |
Viresh Kumar | 26ca869 | 2013-09-20 22:37:31 +0530 | [diff] [blame] | 1532 | |
Aaron Plattner | 999976e | 2014-03-04 12:42:15 -0800 | [diff] [blame] | 1533 | cpufreq_cpu_put(policy); |
| 1534 | } |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 1535 | |
Dave Jones | 4d34a67 | 2008-02-07 16:33:49 -0500 | [diff] [blame] | 1536 | return ret_freq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | } |
| 1538 | EXPORT_SYMBOL(cpufreq_get); |
| 1539 | |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 1540 | static struct subsys_interface cpufreq_interface = { |
| 1541 | .name = "cpufreq", |
| 1542 | .subsys = &cpu_subsys, |
| 1543 | .add_dev = cpufreq_add_dev, |
| 1544 | .remove_dev = cpufreq_remove_dev, |
Rafael J. Wysocki | e00e56d | 2011-03-23 22:16:32 +0100 | [diff] [blame] | 1545 | }; |
| 1546 | |
Viresh Kumar | e28867e | 2014-03-04 11:00:27 +0800 | [diff] [blame] | 1547 | /* |
| 1548 | * In case platform wants some specific frequency to be configured |
| 1549 | * during suspend.. |
Benjamin Herrenschmidt | 42d4dc3 | 2005-04-29 07:40:12 -0700 | [diff] [blame] | 1550 | */ |
Viresh Kumar | e28867e | 2014-03-04 11:00:27 +0800 | [diff] [blame] | 1551 | int cpufreq_generic_suspend(struct cpufreq_policy *policy) |
Benjamin Herrenschmidt | 42d4dc3 | 2005-04-29 07:40:12 -0700 | [diff] [blame] | 1552 | { |
Viresh Kumar | e28867e | 2014-03-04 11:00:27 +0800 | [diff] [blame] | 1553 | int ret; |
Dave Jones | 4bc5d34 | 2009-08-04 14:03:25 -0400 | [diff] [blame] | 1554 | |
Viresh Kumar | e28867e | 2014-03-04 11:00:27 +0800 | [diff] [blame] | 1555 | if (!policy->suspend_freq) { |
Bartlomiej Zolnierkiewicz | 201f371 | 2015-09-08 18:41:02 +0200 | [diff] [blame] | 1556 | pr_debug("%s: suspend_freq not defined\n", __func__); |
| 1557 | return 0; |
Benjamin Herrenschmidt | 42d4dc3 | 2005-04-29 07:40:12 -0700 | [diff] [blame] | 1558 | } |
| 1559 | |
Viresh Kumar | e28867e | 2014-03-04 11:00:27 +0800 | [diff] [blame] | 1560 | pr_debug("%s: Setting suspend-freq: %u\n", __func__, |
| 1561 | policy->suspend_freq); |
| 1562 | |
| 1563 | ret = __cpufreq_driver_target(policy, policy->suspend_freq, |
| 1564 | CPUFREQ_RELATION_H); |
| 1565 | if (ret) |
| 1566 | pr_err("%s: unable to set suspend-freq: %u. err: %d\n", |
| 1567 | __func__, policy->suspend_freq, ret); |
| 1568 | |
Dave Jones | c906049 | 2008-02-07 16:32:18 -0500 | [diff] [blame] | 1569 | return ret; |
Benjamin Herrenschmidt | 42d4dc3 | 2005-04-29 07:40:12 -0700 | [diff] [blame] | 1570 | } |
Viresh Kumar | e28867e | 2014-03-04 11:00:27 +0800 | [diff] [blame] | 1571 | EXPORT_SYMBOL(cpufreq_generic_suspend); |
Benjamin Herrenschmidt | 42d4dc3 | 2005-04-29 07:40:12 -0700 | [diff] [blame] | 1572 | |
| 1573 | /** |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1574 | * cpufreq_suspend() - Suspend CPUFreq governors |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1575 | * |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1576 | * Called during system wide Suspend/Hibernate cycles for suspending governors |
| 1577 | * as some platforms can't change frequency after this point in suspend cycle. |
| 1578 | * Because some of the devices (like: i2c, regulators, etc) they use for |
| 1579 | * changing frequency are suspended quickly after this point. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1580 | */ |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1581 | void cpufreq_suspend(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | { |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 1583 | struct cpufreq_policy *policy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1584 | |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1585 | if (!cpufreq_driver) |
Rafael J. Wysocki | e00e56d | 2011-03-23 22:16:32 +0100 | [diff] [blame] | 1586 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1587 | |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1588 | if (!has_target()) |
Viresh Kumar | b1b12ba | 2014-09-30 09:33:17 +0530 | [diff] [blame] | 1589 | goto suspend; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1590 | |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1591 | pr_debug("%s: Suspending Governors\n", __func__); |
| 1592 | |
Viresh Kumar | f963735 | 2015-05-12 12:20:11 +0530 | [diff] [blame] | 1593 | for_each_active_policy(policy) { |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1594 | if (__cpufreq_governor(policy, CPUFREQ_GOV_STOP)) |
| 1595 | pr_err("%s: Failed to stop governor for policy: %p\n", |
| 1596 | __func__, policy); |
| 1597 | else if (cpufreq_driver->suspend |
| 1598 | && cpufreq_driver->suspend(policy)) |
| 1599 | pr_err("%s: Failed to suspend driver: %p\n", __func__, |
| 1600 | policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1601 | } |
Viresh Kumar | b1b12ba | 2014-09-30 09:33:17 +0530 | [diff] [blame] | 1602 | |
| 1603 | suspend: |
| 1604 | cpufreq_suspended = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1605 | } |
| 1606 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1607 | /** |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1608 | * cpufreq_resume() - Resume CPUFreq governors |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | * |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1610 | * Called during system wide Suspend/Hibernate cycle for resuming governors that |
| 1611 | * are suspended with cpufreq_suspend(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1612 | */ |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1613 | void cpufreq_resume(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1614 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1615 | struct cpufreq_policy *policy; |
| 1616 | |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1617 | if (!cpufreq_driver) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1618 | return; |
| 1619 | |
Lan Tianyu | 8e30444 | 2014-09-18 15:03:07 +0800 | [diff] [blame] | 1620 | cpufreq_suspended = false; |
| 1621 | |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1622 | if (!has_target()) |
| 1623 | return; |
| 1624 | |
| 1625 | pr_debug("%s: Resuming Governors\n", __func__); |
| 1626 | |
Viresh Kumar | f963735 | 2015-05-12 12:20:11 +0530 | [diff] [blame] | 1627 | for_each_active_policy(policy) { |
Viresh Kumar | 0c5aa40 | 2014-03-24 12:30:29 +0530 | [diff] [blame] | 1628 | if (cpufreq_driver->resume && cpufreq_driver->resume(policy)) |
| 1629 | pr_err("%s: Failed to resume driver: %p\n", __func__, |
| 1630 | policy); |
| 1631 | else if (__cpufreq_governor(policy, CPUFREQ_GOV_START) |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1632 | || __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS)) |
| 1633 | pr_err("%s: Failed to start governor for policy: %p\n", |
| 1634 | __func__, policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1635 | } |
Viresh Kumar | c75de0a | 2015-04-02 10:21:33 +0530 | [diff] [blame] | 1636 | |
| 1637 | /* |
| 1638 | * schedule call cpufreq_update_policy() for first-online CPU, as that |
| 1639 | * wouldn't be hotplugged-out on suspend. It will verify that the |
| 1640 | * current freq is in sync with what we believe it to be. |
| 1641 | */ |
| 1642 | policy = cpufreq_cpu_get_raw(cpumask_first(cpu_online_mask)); |
| 1643 | if (WARN_ON(!policy)) |
| 1644 | return; |
| 1645 | |
| 1646 | schedule_work(&policy->update); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1647 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1648 | |
Borislav Petkov | 9d95046 | 2013-01-20 10:24:28 +0000 | [diff] [blame] | 1649 | /** |
| 1650 | * cpufreq_get_current_driver - return current driver's name |
| 1651 | * |
| 1652 | * Return the name string of the currently loaded cpufreq driver |
| 1653 | * or NULL, if none. |
| 1654 | */ |
| 1655 | const char *cpufreq_get_current_driver(void) |
| 1656 | { |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 1657 | if (cpufreq_driver) |
| 1658 | return cpufreq_driver->name; |
| 1659 | |
| 1660 | return NULL; |
Borislav Petkov | 9d95046 | 2013-01-20 10:24:28 +0000 | [diff] [blame] | 1661 | } |
| 1662 | EXPORT_SYMBOL_GPL(cpufreq_get_current_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1663 | |
Thomas Petazzoni | 51315cd | 2014-10-19 11:30:27 +0200 | [diff] [blame] | 1664 | /** |
| 1665 | * cpufreq_get_driver_data - return current driver data |
| 1666 | * |
| 1667 | * Return the private data of the currently loaded cpufreq |
| 1668 | * driver, or NULL if no cpufreq driver is loaded. |
| 1669 | */ |
| 1670 | void *cpufreq_get_driver_data(void) |
| 1671 | { |
| 1672 | if (cpufreq_driver) |
| 1673 | return cpufreq_driver->driver_data; |
| 1674 | |
| 1675 | return NULL; |
| 1676 | } |
| 1677 | EXPORT_SYMBOL_GPL(cpufreq_get_driver_data); |
| 1678 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1679 | /********************************************************************* |
| 1680 | * NOTIFIER LISTS INTERFACE * |
| 1681 | *********************************************************************/ |
| 1682 | |
| 1683 | /** |
| 1684 | * cpufreq_register_notifier - register a driver with cpufreq |
| 1685 | * @nb: notifier function to register |
| 1686 | * @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER |
| 1687 | * |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 1688 | * Add a driver to one of two lists: either a list of drivers that |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | * are notified about clock rate changes (once before and once after |
| 1690 | * the transition), or a list of drivers that are notified about |
| 1691 | * changes in cpufreq policy. |
| 1692 | * |
| 1693 | * This function may sleep, and has the same return conditions as |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 1694 | * blocking_notifier_chain_register. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1695 | */ |
| 1696 | int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list) |
| 1697 | { |
| 1698 | int ret; |
| 1699 | |
Dirk Brandewie | d5aaffa | 2013-01-17 16:22:21 +0000 | [diff] [blame] | 1700 | if (cpufreq_disabled()) |
| 1701 | return -EINVAL; |
| 1702 | |
Cesar Eduardo Barros | 74212ca | 2008-02-16 08:41:24 -0200 | [diff] [blame] | 1703 | WARN_ON(!init_cpufreq_transition_notifier_list_called); |
| 1704 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | switch (list) { |
| 1706 | case CPUFREQ_TRANSITION_NOTIFIER: |
Alan Stern | b4dfdbb | 2006-10-04 02:17:06 -0700 | [diff] [blame] | 1707 | ret = srcu_notifier_chain_register( |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 1708 | &cpufreq_transition_notifier_list, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1709 | break; |
| 1710 | case CPUFREQ_POLICY_NOTIFIER: |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 1711 | ret = blocking_notifier_chain_register( |
| 1712 | &cpufreq_policy_notifier_list, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | break; |
| 1714 | default: |
| 1715 | ret = -EINVAL; |
| 1716 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1717 | |
| 1718 | return ret; |
| 1719 | } |
| 1720 | EXPORT_SYMBOL(cpufreq_register_notifier); |
| 1721 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | /** |
| 1723 | * cpufreq_unregister_notifier - unregister a driver with cpufreq |
| 1724 | * @nb: notifier block to be unregistered |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 1725 | * @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1726 | * |
| 1727 | * Remove a driver from the CPU frequency notifier list. |
| 1728 | * |
| 1729 | * This function may sleep, and has the same return conditions as |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 1730 | * blocking_notifier_chain_unregister. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1731 | */ |
| 1732 | int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list) |
| 1733 | { |
| 1734 | int ret; |
| 1735 | |
Dirk Brandewie | d5aaffa | 2013-01-17 16:22:21 +0000 | [diff] [blame] | 1736 | if (cpufreq_disabled()) |
| 1737 | return -EINVAL; |
| 1738 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1739 | switch (list) { |
| 1740 | case CPUFREQ_TRANSITION_NOTIFIER: |
Alan Stern | b4dfdbb | 2006-10-04 02:17:06 -0700 | [diff] [blame] | 1741 | ret = srcu_notifier_chain_unregister( |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 1742 | &cpufreq_transition_notifier_list, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1743 | break; |
| 1744 | case CPUFREQ_POLICY_NOTIFIER: |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 1745 | ret = blocking_notifier_chain_unregister( |
| 1746 | &cpufreq_policy_notifier_list, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1747 | break; |
| 1748 | default: |
| 1749 | ret = -EINVAL; |
| 1750 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1751 | |
| 1752 | return ret; |
| 1753 | } |
| 1754 | EXPORT_SYMBOL(cpufreq_unregister_notifier); |
| 1755 | |
| 1756 | |
| 1757 | /********************************************************************* |
| 1758 | * GOVERNORS * |
| 1759 | *********************************************************************/ |
| 1760 | |
Viresh Kumar | 1c03a2d | 2014-06-02 22:49:28 +0530 | [diff] [blame] | 1761 | /* Must set freqs->new to intermediate frequency */ |
| 1762 | static int __target_intermediate(struct cpufreq_policy *policy, |
| 1763 | struct cpufreq_freqs *freqs, int index) |
| 1764 | { |
| 1765 | int ret; |
| 1766 | |
| 1767 | freqs->new = cpufreq_driver->get_intermediate(policy, index); |
| 1768 | |
| 1769 | /* We don't need to switch to intermediate freq */ |
| 1770 | if (!freqs->new) |
| 1771 | return 0; |
| 1772 | |
| 1773 | pr_debug("%s: cpu: %d, switching to intermediate freq: oldfreq: %u, intermediate freq: %u\n", |
| 1774 | __func__, policy->cpu, freqs->old, freqs->new); |
| 1775 | |
| 1776 | cpufreq_freq_transition_begin(policy, freqs); |
| 1777 | ret = cpufreq_driver->target_intermediate(policy, index); |
| 1778 | cpufreq_freq_transition_end(policy, freqs, ret); |
| 1779 | |
| 1780 | if (ret) |
| 1781 | pr_err("%s: Failed to change to intermediate frequency: %d\n", |
| 1782 | __func__, ret); |
| 1783 | |
| 1784 | return ret; |
| 1785 | } |
| 1786 | |
Viresh Kumar | 8d65775 | 2014-05-21 14:29:29 +0530 | [diff] [blame] | 1787 | static int __target_index(struct cpufreq_policy *policy, |
| 1788 | struct cpufreq_frequency_table *freq_table, int index) |
| 1789 | { |
Viresh Kumar | 1c03a2d | 2014-06-02 22:49:28 +0530 | [diff] [blame] | 1790 | struct cpufreq_freqs freqs = {.old = policy->cur, .flags = 0}; |
| 1791 | unsigned int intermediate_freq = 0; |
Viresh Kumar | 8d65775 | 2014-05-21 14:29:29 +0530 | [diff] [blame] | 1792 | int retval = -EINVAL; |
| 1793 | bool notify; |
| 1794 | |
| 1795 | notify = !(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION); |
Viresh Kumar | 8d65775 | 2014-05-21 14:29:29 +0530 | [diff] [blame] | 1796 | if (notify) { |
Viresh Kumar | 1c03a2d | 2014-06-02 22:49:28 +0530 | [diff] [blame] | 1797 | /* Handle switching to intermediate frequency */ |
| 1798 | if (cpufreq_driver->get_intermediate) { |
| 1799 | retval = __target_intermediate(policy, &freqs, index); |
| 1800 | if (retval) |
| 1801 | return retval; |
Viresh Kumar | 8d65775 | 2014-05-21 14:29:29 +0530 | [diff] [blame] | 1802 | |
Viresh Kumar | 1c03a2d | 2014-06-02 22:49:28 +0530 | [diff] [blame] | 1803 | intermediate_freq = freqs.new; |
| 1804 | /* Set old freq to intermediate */ |
| 1805 | if (intermediate_freq) |
| 1806 | freqs.old = freqs.new; |
| 1807 | } |
| 1808 | |
| 1809 | freqs.new = freq_table[index].frequency; |
Viresh Kumar | 8d65775 | 2014-05-21 14:29:29 +0530 | [diff] [blame] | 1810 | pr_debug("%s: cpu: %d, oldfreq: %u, new freq: %u\n", |
| 1811 | __func__, policy->cpu, freqs.old, freqs.new); |
| 1812 | |
| 1813 | cpufreq_freq_transition_begin(policy, &freqs); |
| 1814 | } |
| 1815 | |
| 1816 | retval = cpufreq_driver->target_index(policy, index); |
| 1817 | if (retval) |
| 1818 | pr_err("%s: Failed to change cpu frequency: %d\n", __func__, |
| 1819 | retval); |
| 1820 | |
Viresh Kumar | 1c03a2d | 2014-06-02 22:49:28 +0530 | [diff] [blame] | 1821 | if (notify) { |
Viresh Kumar | 8d65775 | 2014-05-21 14:29:29 +0530 | [diff] [blame] | 1822 | cpufreq_freq_transition_end(policy, &freqs, retval); |
| 1823 | |
Viresh Kumar | 1c03a2d | 2014-06-02 22:49:28 +0530 | [diff] [blame] | 1824 | /* |
| 1825 | * Failed after setting to intermediate freq? Driver should have |
| 1826 | * reverted back to initial frequency and so should we. Check |
| 1827 | * here for intermediate_freq instead of get_intermediate, in |
Shailendra Verma | 58405af | 2015-05-22 22:48:22 +0530 | [diff] [blame] | 1828 | * case we haven't switched to intermediate freq at all. |
Viresh Kumar | 1c03a2d | 2014-06-02 22:49:28 +0530 | [diff] [blame] | 1829 | */ |
| 1830 | if (unlikely(retval && intermediate_freq)) { |
| 1831 | freqs.old = intermediate_freq; |
| 1832 | freqs.new = policy->restore_freq; |
| 1833 | cpufreq_freq_transition_begin(policy, &freqs); |
| 1834 | cpufreq_freq_transition_end(policy, &freqs, 0); |
| 1835 | } |
| 1836 | } |
| 1837 | |
Viresh Kumar | 8d65775 | 2014-05-21 14:29:29 +0530 | [diff] [blame] | 1838 | return retval; |
| 1839 | } |
| 1840 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1841 | int __cpufreq_driver_target(struct cpufreq_policy *policy, |
| 1842 | unsigned int target_freq, |
| 1843 | unsigned int relation) |
| 1844 | { |
Viresh Kumar | 7249924 | 2012-10-31 01:28:21 +0100 | [diff] [blame] | 1845 | unsigned int old_target_freq = target_freq; |
Viresh Kumar | 8d65775 | 2014-05-21 14:29:29 +0530 | [diff] [blame] | 1846 | int retval = -EINVAL; |
Ashok Raj | c32b6b8 | 2005-10-30 14:59:54 -0800 | [diff] [blame] | 1847 | |
Konrad Rzeszutek Wilk | a7b422c | 2012-03-13 19:18:39 -0400 | [diff] [blame] | 1848 | if (cpufreq_disabled()) |
| 1849 | return -ENODEV; |
| 1850 | |
Viresh Kumar | 7249924 | 2012-10-31 01:28:21 +0100 | [diff] [blame] | 1851 | /* Make sure that target_freq is within supported range */ |
| 1852 | if (target_freq > policy->max) |
| 1853 | target_freq = policy->max; |
| 1854 | if (target_freq < policy->min) |
| 1855 | target_freq = policy->min; |
| 1856 | |
| 1857 | pr_debug("target for CPU %u: %u kHz, relation %u, requested %u kHz\n", |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 1858 | policy->cpu, target_freq, relation, old_target_freq); |
Viresh Kumar | 5a1c022 | 2012-10-31 01:28:15 +0100 | [diff] [blame] | 1859 | |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 1860 | /* |
| 1861 | * This might look like a redundant call as we are checking it again |
| 1862 | * after finding index. But it is left intentionally for cases where |
| 1863 | * exactly same freq is called again and so we can save on few function |
| 1864 | * calls. |
| 1865 | */ |
Viresh Kumar | 5a1c022 | 2012-10-31 01:28:15 +0100 | [diff] [blame] | 1866 | if (target_freq == policy->cur) |
| 1867 | return 0; |
| 1868 | |
Viresh Kumar | 1c03a2d | 2014-06-02 22:49:28 +0530 | [diff] [blame] | 1869 | /* Save last value to restore later on errors */ |
| 1870 | policy->restore_freq = policy->cur; |
| 1871 | |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 1872 | if (cpufreq_driver->target) |
| 1873 | retval = cpufreq_driver->target(policy, target_freq, relation); |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 1874 | else if (cpufreq_driver->target_index) { |
| 1875 | struct cpufreq_frequency_table *freq_table; |
| 1876 | int index; |
Ashok Raj | 90d45d1 | 2005-11-08 21:34:24 -0800 | [diff] [blame] | 1877 | |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 1878 | freq_table = cpufreq_frequency_get_table(policy->cpu); |
| 1879 | if (unlikely(!freq_table)) { |
| 1880 | pr_err("%s: Unable to find freq_table\n", __func__); |
| 1881 | goto out; |
| 1882 | } |
| 1883 | |
| 1884 | retval = cpufreq_frequency_table_target(policy, freq_table, |
| 1885 | target_freq, relation, &index); |
| 1886 | if (unlikely(retval)) { |
| 1887 | pr_err("%s: Unable to find matching freq\n", __func__); |
| 1888 | goto out; |
| 1889 | } |
| 1890 | |
Viresh Kumar | d4019f0 | 2013-08-14 19:38:24 +0530 | [diff] [blame] | 1891 | if (freq_table[index].frequency == policy->cur) { |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 1892 | retval = 0; |
Viresh Kumar | d4019f0 | 2013-08-14 19:38:24 +0530 | [diff] [blame] | 1893 | goto out; |
| 1894 | } |
| 1895 | |
Viresh Kumar | 8d65775 | 2014-05-21 14:29:29 +0530 | [diff] [blame] | 1896 | retval = __target_index(policy, freq_table, index); |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 1897 | } |
| 1898 | |
| 1899 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1900 | return retval; |
| 1901 | } |
| 1902 | EXPORT_SYMBOL_GPL(__cpufreq_driver_target); |
| 1903 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1904 | int cpufreq_driver_target(struct cpufreq_policy *policy, |
| 1905 | unsigned int target_freq, |
| 1906 | unsigned int relation) |
| 1907 | { |
Julia Lawall | f1829e4 | 2008-07-25 22:44:53 +0200 | [diff] [blame] | 1908 | int ret = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1909 | |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 1910 | down_write(&policy->rwsem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1911 | |
| 1912 | ret = __cpufreq_driver_target(policy, target_freq, relation); |
| 1913 | |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 1914 | up_write(&policy->rwsem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1915 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1916 | return ret; |
| 1917 | } |
| 1918 | EXPORT_SYMBOL_GPL(cpufreq_driver_target); |
| 1919 | |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 1920 | static int __cpufreq_governor(struct cpufreq_policy *policy, |
| 1921 | unsigned int event) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1922 | { |
Dave Jones | cc993ca | 2005-07-28 09:43:56 -0700 | [diff] [blame] | 1923 | int ret; |
Thomas Renninger | 6afde10 | 2007-10-02 13:28:13 -0700 | [diff] [blame] | 1924 | |
| 1925 | /* Only must be defined when default governor is known to have latency |
| 1926 | restrictions, like e.g. conservative or ondemand. |
| 1927 | That this is the case is already ensured in Kconfig |
| 1928 | */ |
| 1929 | #ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE |
| 1930 | struct cpufreq_governor *gov = &cpufreq_gov_performance; |
| 1931 | #else |
| 1932 | struct cpufreq_governor *gov = NULL; |
| 1933 | #endif |
Thomas Renninger | 1c25624 | 2007-10-02 13:28:12 -0700 | [diff] [blame] | 1934 | |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1935 | /* Don't start any governor operations if we are entering suspend */ |
| 1936 | if (cpufreq_suspended) |
| 1937 | return 0; |
Ethan Zhao | cb57720 | 2014-12-18 15:28:19 +0900 | [diff] [blame] | 1938 | /* |
| 1939 | * Governor might not be initiated here if ACPI _PPC changed |
| 1940 | * notification happened, so check it. |
| 1941 | */ |
| 1942 | if (!policy->governor) |
| 1943 | return -EINVAL; |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1944 | |
Thomas Renninger | 1c25624 | 2007-10-02 13:28:12 -0700 | [diff] [blame] | 1945 | if (policy->governor->max_transition_latency && |
| 1946 | policy->cpuinfo.transition_latency > |
| 1947 | policy->governor->max_transition_latency) { |
Thomas Renninger | 6afde10 | 2007-10-02 13:28:13 -0700 | [diff] [blame] | 1948 | if (!gov) |
| 1949 | return -EINVAL; |
| 1950 | else { |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 1951 | pr_warn("%s governor failed, too long transition latency of HW, fallback to %s governor\n", |
| 1952 | policy->governor->name, gov->name); |
Thomas Renninger | 6afde10 | 2007-10-02 13:28:13 -0700 | [diff] [blame] | 1953 | policy->governor = gov; |
| 1954 | } |
Thomas Renninger | 1c25624 | 2007-10-02 13:28:12 -0700 | [diff] [blame] | 1955 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1956 | |
Viresh Kumar | fe492f3 | 2013-08-06 22:53:10 +0530 | [diff] [blame] | 1957 | if (event == CPUFREQ_GOV_POLICY_INIT) |
| 1958 | if (!try_module_get(policy->governor->owner)) |
| 1959 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1960 | |
Viresh Kumar | 63431f7 | 2015-07-27 17:58:06 +0530 | [diff] [blame] | 1961 | pr_debug("%s: for CPU %u, event %u\n", __func__, policy->cpu, event); |
Xiaoguang Chen | 95731eb | 2013-06-19 15:00:07 +0800 | [diff] [blame] | 1962 | |
| 1963 | mutex_lock(&cpufreq_governor_lock); |
Srivatsa S. Bhat | 56d07db | 2013-09-07 01:23:55 +0530 | [diff] [blame] | 1964 | if ((policy->governor_enabled && event == CPUFREQ_GOV_START) |
Viresh Kumar | f73d393 | 2013-08-31 17:53:40 +0530 | [diff] [blame] | 1965 | || (!policy->governor_enabled |
| 1966 | && (event == CPUFREQ_GOV_LIMITS || event == CPUFREQ_GOV_STOP))) { |
Xiaoguang Chen | 95731eb | 2013-06-19 15:00:07 +0800 | [diff] [blame] | 1967 | mutex_unlock(&cpufreq_governor_lock); |
| 1968 | return -EBUSY; |
| 1969 | } |
| 1970 | |
| 1971 | if (event == CPUFREQ_GOV_STOP) |
| 1972 | policy->governor_enabled = false; |
| 1973 | else if (event == CPUFREQ_GOV_START) |
| 1974 | policy->governor_enabled = true; |
| 1975 | |
| 1976 | mutex_unlock(&cpufreq_governor_lock); |
| 1977 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1978 | ret = policy->governor->governor(policy, event); |
| 1979 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 1980 | if (!ret) { |
| 1981 | if (event == CPUFREQ_GOV_POLICY_INIT) |
| 1982 | policy->governor->initialized++; |
| 1983 | else if (event == CPUFREQ_GOV_POLICY_EXIT) |
| 1984 | policy->governor->initialized--; |
Xiaoguang Chen | 95731eb | 2013-06-19 15:00:07 +0800 | [diff] [blame] | 1985 | } else { |
| 1986 | /* Restore original values */ |
| 1987 | mutex_lock(&cpufreq_governor_lock); |
| 1988 | if (event == CPUFREQ_GOV_STOP) |
| 1989 | policy->governor_enabled = true; |
| 1990 | else if (event == CPUFREQ_GOV_START) |
| 1991 | policy->governor_enabled = false; |
| 1992 | mutex_unlock(&cpufreq_governor_lock); |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 1993 | } |
Viresh Kumar | b394058 | 2013-02-01 05:42:58 +0000 | [diff] [blame] | 1994 | |
Viresh Kumar | fe492f3 | 2013-08-06 22:53:10 +0530 | [diff] [blame] | 1995 | if (((event == CPUFREQ_GOV_POLICY_INIT) && ret) || |
| 1996 | ((event == CPUFREQ_GOV_POLICY_EXIT) && !ret)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1997 | module_put(policy->governor->owner); |
| 1998 | |
| 1999 | return ret; |
| 2000 | } |
| 2001 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2002 | int cpufreq_register_governor(struct cpufreq_governor *governor) |
| 2003 | { |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 2004 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2005 | |
| 2006 | if (!governor) |
| 2007 | return -EINVAL; |
| 2008 | |
Konrad Rzeszutek Wilk | a7b422c | 2012-03-13 19:18:39 -0400 | [diff] [blame] | 2009 | if (cpufreq_disabled()) |
| 2010 | return -ENODEV; |
| 2011 | |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 2012 | mutex_lock(&cpufreq_governor_mutex); |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 2013 | |
Viresh Kumar | b394058 | 2013-02-01 05:42:58 +0000 | [diff] [blame] | 2014 | governor->initialized = 0; |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 2015 | err = -EBUSY; |
Viresh Kumar | 42f91fa | 2015-01-02 12:34:26 +0530 | [diff] [blame] | 2016 | if (!find_governor(governor->name)) { |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 2017 | err = 0; |
| 2018 | list_add(&governor->governor_list, &cpufreq_governor_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2020 | |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 2021 | mutex_unlock(&cpufreq_governor_mutex); |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 2022 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2023 | } |
| 2024 | EXPORT_SYMBOL_GPL(cpufreq_register_governor); |
| 2025 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2026 | void cpufreq_unregister_governor(struct cpufreq_governor *governor) |
| 2027 | { |
Viresh Kumar | 4573237 | 2015-05-12 12:22:34 +0530 | [diff] [blame] | 2028 | struct cpufreq_policy *policy; |
| 2029 | unsigned long flags; |
Prarit Bhargava | 90e41ba | 2009-11-12 09:18:46 -0500 | [diff] [blame] | 2030 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2031 | if (!governor) |
| 2032 | return; |
| 2033 | |
Konrad Rzeszutek Wilk | a7b422c | 2012-03-13 19:18:39 -0400 | [diff] [blame] | 2034 | if (cpufreq_disabled()) |
| 2035 | return; |
| 2036 | |
Viresh Kumar | 4573237 | 2015-05-12 12:22:34 +0530 | [diff] [blame] | 2037 | /* clear last_governor for all inactive policies */ |
| 2038 | read_lock_irqsave(&cpufreq_driver_lock, flags); |
| 2039 | for_each_inactive_policy(policy) { |
Viresh Kumar | 18bf3a1 | 2015-05-12 12:22:51 +0530 | [diff] [blame] | 2040 | if (!strcmp(policy->last_governor, governor->name)) { |
| 2041 | policy->governor = NULL; |
Viresh Kumar | 4573237 | 2015-05-12 12:22:34 +0530 | [diff] [blame] | 2042 | strcpy(policy->last_governor, "\0"); |
Viresh Kumar | 18bf3a1 | 2015-05-12 12:22:51 +0530 | [diff] [blame] | 2043 | } |
Prarit Bhargava | 90e41ba | 2009-11-12 09:18:46 -0500 | [diff] [blame] | 2044 | } |
Viresh Kumar | 4573237 | 2015-05-12 12:22:34 +0530 | [diff] [blame] | 2045 | read_unlock_irqrestore(&cpufreq_driver_lock, flags); |
Prarit Bhargava | 90e41ba | 2009-11-12 09:18:46 -0500 | [diff] [blame] | 2046 | |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 2047 | mutex_lock(&cpufreq_governor_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2048 | list_del(&governor->governor_list); |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 2049 | mutex_unlock(&cpufreq_governor_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2050 | return; |
| 2051 | } |
| 2052 | EXPORT_SYMBOL_GPL(cpufreq_unregister_governor); |
| 2053 | |
| 2054 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2055 | /********************************************************************* |
| 2056 | * POLICY INTERFACE * |
| 2057 | *********************************************************************/ |
| 2058 | |
| 2059 | /** |
| 2060 | * cpufreq_get_policy - get the current cpufreq_policy |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 2061 | * @policy: struct cpufreq_policy into which the current cpufreq_policy |
| 2062 | * is written |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2063 | * |
| 2064 | * Reads the current cpufreq policy. |
| 2065 | */ |
| 2066 | int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu) |
| 2067 | { |
| 2068 | struct cpufreq_policy *cpu_policy; |
| 2069 | if (!policy) |
| 2070 | return -EINVAL; |
| 2071 | |
| 2072 | cpu_policy = cpufreq_cpu_get(cpu); |
| 2073 | if (!cpu_policy) |
| 2074 | return -EINVAL; |
| 2075 | |
Viresh Kumar | d5b73cd | 2013-08-06 22:53:06 +0530 | [diff] [blame] | 2076 | memcpy(policy, cpu_policy, sizeof(*policy)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2077 | |
| 2078 | cpufreq_cpu_put(cpu_policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2079 | return 0; |
| 2080 | } |
| 2081 | EXPORT_SYMBOL(cpufreq_get_policy); |
| 2082 | |
Arjan van de Ven | 153d7f3 | 2006-07-26 15:40:07 +0200 | [diff] [blame] | 2083 | /* |
Viresh Kumar | 037ce83 | 2013-10-02 14:13:16 +0530 | [diff] [blame] | 2084 | * policy : current policy. |
| 2085 | * new_policy: policy to be set. |
Arjan van de Ven | 153d7f3 | 2006-07-26 15:40:07 +0200 | [diff] [blame] | 2086 | */ |
Viresh Kumar | 037ce83 | 2013-10-02 14:13:16 +0530 | [diff] [blame] | 2087 | static int cpufreq_set_policy(struct cpufreq_policy *policy, |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2088 | struct cpufreq_policy *new_policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | { |
Rafael J. Wysocki | d9a789c | 2014-02-17 22:56:35 +0100 | [diff] [blame] | 2090 | struct cpufreq_governor *old_gov; |
| 2091 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2092 | |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 2093 | pr_debug("setting new policy for CPU %u: %u - %u kHz\n", |
| 2094 | new_policy->cpu, new_policy->min, new_policy->max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2095 | |
Viresh Kumar | d5b73cd | 2013-08-06 22:53:06 +0530 | [diff] [blame] | 2096 | memcpy(&new_policy->cpuinfo, &policy->cpuinfo, sizeof(policy->cpuinfo)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2097 | |
Pan Xinhui | fba9573 | 2015-07-30 18:10:40 +0800 | [diff] [blame] | 2098 | /* |
| 2099 | * This check works well when we store new min/max freq attributes, |
| 2100 | * because new_policy is a copy of policy with one field updated. |
| 2101 | */ |
| 2102 | if (new_policy->min > new_policy->max) |
Rafael J. Wysocki | d9a789c | 2014-02-17 22:56:35 +0100 | [diff] [blame] | 2103 | return -EINVAL; |
Mattia Dongili | 9c9a43e | 2006-07-05 23:12:20 +0200 | [diff] [blame] | 2104 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2105 | /* verify the cpu speed can be set within this limit */ |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2106 | ret = cpufreq_driver->verify(new_policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2107 | if (ret) |
Rafael J. Wysocki | d9a789c | 2014-02-17 22:56:35 +0100 | [diff] [blame] | 2108 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2109 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2110 | /* adjust if necessary - all reasons */ |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 2111 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2112 | CPUFREQ_ADJUST, new_policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2113 | |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 2114 | /* |
| 2115 | * verify the cpu speed can be set within this limit, which might be |
| 2116 | * different to the first one |
| 2117 | */ |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2118 | ret = cpufreq_driver->verify(new_policy); |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 2119 | if (ret) |
Rafael J. Wysocki | d9a789c | 2014-02-17 22:56:35 +0100 | [diff] [blame] | 2120 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2121 | |
| 2122 | /* notification of the new policy */ |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 2123 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2124 | CPUFREQ_NOTIFY, new_policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2125 | |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2126 | policy->min = new_policy->min; |
| 2127 | policy->max = new_policy->max; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2128 | |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 2129 | pr_debug("new min and max freqs are %u - %u kHz\n", |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 2130 | policy->min, policy->max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2131 | |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 2132 | if (cpufreq_driver->setpolicy) { |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2133 | policy->policy = new_policy->policy; |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 2134 | pr_debug("setting range\n"); |
Rafael J. Wysocki | d9a789c | 2014-02-17 22:56:35 +0100 | [diff] [blame] | 2135 | return cpufreq_driver->setpolicy(new_policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2136 | } |
| 2137 | |
Rafael J. Wysocki | d9a789c | 2014-02-17 22:56:35 +0100 | [diff] [blame] | 2138 | if (new_policy->governor == policy->governor) |
| 2139 | goto out; |
| 2140 | |
| 2141 | pr_debug("governor switch\n"); |
| 2142 | |
| 2143 | /* save old, working values */ |
| 2144 | old_gov = policy->governor; |
| 2145 | /* end old governor */ |
| 2146 | if (old_gov) { |
Viresh Kumar | 4bc384a | 2015-07-18 11:31:03 +0530 | [diff] [blame] | 2147 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP); |
| 2148 | if (ret) { |
| 2149 | /* This can happen due to race with other operations */ |
| 2150 | pr_debug("%s: Failed to Stop Governor: %s (%d)\n", |
| 2151 | __func__, old_gov->name, ret); |
| 2152 | return ret; |
| 2153 | } |
| 2154 | |
Rafael J. Wysocki | d9a789c | 2014-02-17 22:56:35 +0100 | [diff] [blame] | 2155 | up_write(&policy->rwsem); |
Viresh Kumar | 4bc384a | 2015-07-18 11:31:03 +0530 | [diff] [blame] | 2156 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); |
Rafael J. Wysocki | d9a789c | 2014-02-17 22:56:35 +0100 | [diff] [blame] | 2157 | down_write(&policy->rwsem); |
Viresh Kumar | 4bc384a | 2015-07-18 11:31:03 +0530 | [diff] [blame] | 2158 | |
| 2159 | if (ret) { |
| 2160 | pr_err("%s: Failed to Exit Governor: %s (%d)\n", |
| 2161 | __func__, old_gov->name, ret); |
| 2162 | return ret; |
| 2163 | } |
Rafael J. Wysocki | d9a789c | 2014-02-17 22:56:35 +0100 | [diff] [blame] | 2164 | } |
| 2165 | |
| 2166 | /* start new governor */ |
| 2167 | policy->governor = new_policy->governor; |
Viresh Kumar | 4bc384a | 2015-07-18 11:31:03 +0530 | [diff] [blame] | 2168 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT); |
| 2169 | if (!ret) { |
| 2170 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_START); |
| 2171 | if (!ret) |
Rafael J. Wysocki | d9a789c | 2014-02-17 22:56:35 +0100 | [diff] [blame] | 2172 | goto out; |
| 2173 | |
| 2174 | up_write(&policy->rwsem); |
| 2175 | __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); |
| 2176 | down_write(&policy->rwsem); |
| 2177 | } |
| 2178 | |
| 2179 | /* new governor failed, so re-start old one */ |
| 2180 | pr_debug("starting governor %s failed\n", policy->governor->name); |
| 2181 | if (old_gov) { |
| 2182 | policy->governor = old_gov; |
Viresh Kumar | 4bc384a | 2015-07-18 11:31:03 +0530 | [diff] [blame] | 2183 | if (__cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT)) |
| 2184 | policy->governor = NULL; |
| 2185 | else |
| 2186 | __cpufreq_governor(policy, CPUFREQ_GOV_START); |
Rafael J. Wysocki | d9a789c | 2014-02-17 22:56:35 +0100 | [diff] [blame] | 2187 | } |
| 2188 | |
Viresh Kumar | 4bc384a | 2015-07-18 11:31:03 +0530 | [diff] [blame] | 2189 | return ret; |
Rafael J. Wysocki | d9a789c | 2014-02-17 22:56:35 +0100 | [diff] [blame] | 2190 | |
| 2191 | out: |
| 2192 | pr_debug("governor: change or update limits\n"); |
| 2193 | return __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2194 | } |
| 2195 | |
| 2196 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2197 | * cpufreq_update_policy - re-evaluate an existing cpufreq policy |
| 2198 | * @cpu: CPU which shall be re-evaluated |
| 2199 | * |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2200 | * Useful for policy notifiers which have different necessities |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2201 | * at different times. |
| 2202 | */ |
| 2203 | int cpufreq_update_policy(unsigned int cpu) |
| 2204 | { |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2205 | struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); |
| 2206 | struct cpufreq_policy new_policy; |
Julia Lawall | f1829e4 | 2008-07-25 22:44:53 +0200 | [diff] [blame] | 2207 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2208 | |
Aaron Plattner | fefa8ff | 2014-06-18 11:27:32 -0700 | [diff] [blame] | 2209 | if (!policy) |
| 2210 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2211 | |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 2212 | down_write(&policy->rwsem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2213 | |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 2214 | pr_debug("updating policy for CPU %u\n", cpu); |
Viresh Kumar | d5b73cd | 2013-08-06 22:53:06 +0530 | [diff] [blame] | 2215 | memcpy(&new_policy, policy, sizeof(*policy)); |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2216 | new_policy.min = policy->user_policy.min; |
| 2217 | new_policy.max = policy->user_policy.max; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2218 | |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 2219 | /* |
| 2220 | * BIOS might change freq behind our back |
| 2221 | * -> ask driver for current freq and notify governors about a change |
| 2222 | */ |
Rafael J. Wysocki | 2ed99e3 | 2014-03-12 21:49:33 +0100 | [diff] [blame] | 2223 | if (cpufreq_driver->get && !cpufreq_driver->setpolicy) { |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2224 | new_policy.cur = cpufreq_driver->get(cpu); |
Viresh Kumar | bd0fa9b | 2014-02-25 14:29:44 +0530 | [diff] [blame] | 2225 | if (WARN_ON(!new_policy.cur)) { |
| 2226 | ret = -EIO; |
Aaron Plattner | fefa8ff | 2014-06-18 11:27:32 -0700 | [diff] [blame] | 2227 | goto unlock; |
Viresh Kumar | bd0fa9b | 2014-02-25 14:29:44 +0530 | [diff] [blame] | 2228 | } |
| 2229 | |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2230 | if (!policy->cur) { |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 2231 | pr_debug("Driver did not initialize current freq\n"); |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2232 | policy->cur = new_policy.cur; |
Thomas Renninger | a85f7bd | 2006-02-01 11:36:04 +0100 | [diff] [blame] | 2233 | } else { |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 2234 | if (policy->cur != new_policy.cur && has_target()) |
Viresh Kumar | a1e1dc4 | 2015-01-02 12:34:28 +0530 | [diff] [blame] | 2235 | cpufreq_out_of_sync(policy, new_policy.cur); |
Thomas Renninger | a85f7bd | 2006-02-01 11:36:04 +0100 | [diff] [blame] | 2236 | } |
Thomas Renninger | 0961dd0 | 2006-01-26 18:46:33 +0100 | [diff] [blame] | 2237 | } |
| 2238 | |
Viresh Kumar | 037ce83 | 2013-10-02 14:13:16 +0530 | [diff] [blame] | 2239 | ret = cpufreq_set_policy(policy, &new_policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2240 | |
Aaron Plattner | fefa8ff | 2014-06-18 11:27:32 -0700 | [diff] [blame] | 2241 | unlock: |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 2242 | up_write(&policy->rwsem); |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 2243 | |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2244 | cpufreq_cpu_put(policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2245 | return ret; |
| 2246 | } |
| 2247 | EXPORT_SYMBOL(cpufreq_update_policy); |
| 2248 | |
Paul Gortmaker | 2760984 | 2013-06-19 13:54:04 -0400 | [diff] [blame] | 2249 | static int cpufreq_cpu_callback(struct notifier_block *nfb, |
Ashok Raj | c32b6b8 | 2005-10-30 14:59:54 -0800 | [diff] [blame] | 2250 | unsigned long action, void *hcpu) |
| 2251 | { |
| 2252 | unsigned int cpu = (unsigned long)hcpu; |
Ashok Raj | c32b6b8 | 2005-10-30 14:59:54 -0800 | [diff] [blame] | 2253 | |
Rafael J. Wysocki | 0b27535 | 2015-07-29 03:03:44 +0200 | [diff] [blame] | 2254 | switch (action & ~CPU_TASKS_FROZEN) { |
| 2255 | case CPU_ONLINE: |
| 2256 | cpufreq_online(cpu); |
| 2257 | break; |
Srivatsa S. Bhat | 5302c3f | 2013-07-30 04:25:25 +0530 | [diff] [blame] | 2258 | |
Rafael J. Wysocki | 0b27535 | 2015-07-29 03:03:44 +0200 | [diff] [blame] | 2259 | case CPU_DOWN_PREPARE: |
| 2260 | cpufreq_offline_prepare(cpu); |
| 2261 | break; |
Srivatsa S. Bhat | 1aee40a | 2013-09-07 01:23:27 +0530 | [diff] [blame] | 2262 | |
Rafael J. Wysocki | 0b27535 | 2015-07-29 03:03:44 +0200 | [diff] [blame] | 2263 | case CPU_POST_DEAD: |
| 2264 | cpufreq_offline_finish(cpu); |
| 2265 | break; |
Srivatsa S. Bhat | 5302c3f | 2013-07-30 04:25:25 +0530 | [diff] [blame] | 2266 | |
Rafael J. Wysocki | 0b27535 | 2015-07-29 03:03:44 +0200 | [diff] [blame] | 2267 | case CPU_DOWN_FAILED: |
| 2268 | cpufreq_online(cpu); |
| 2269 | break; |
Ashok Raj | c32b6b8 | 2005-10-30 14:59:54 -0800 | [diff] [blame] | 2270 | } |
| 2271 | return NOTIFY_OK; |
| 2272 | } |
| 2273 | |
Neal Buckendahl | 9c36f74 | 2010-06-22 22:02:44 -0500 | [diff] [blame] | 2274 | static struct notifier_block __refdata cpufreq_cpu_notifier = { |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 2275 | .notifier_call = cpufreq_cpu_callback, |
Ashok Raj | c32b6b8 | 2005-10-30 14:59:54 -0800 | [diff] [blame] | 2276 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2277 | |
| 2278 | /********************************************************************* |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 2279 | * BOOST * |
| 2280 | *********************************************************************/ |
| 2281 | static int cpufreq_boost_set_sw(int state) |
| 2282 | { |
| 2283 | struct cpufreq_frequency_table *freq_table; |
| 2284 | struct cpufreq_policy *policy; |
| 2285 | int ret = -EINVAL; |
| 2286 | |
Viresh Kumar | f963735 | 2015-05-12 12:20:11 +0530 | [diff] [blame] | 2287 | for_each_active_policy(policy) { |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 2288 | freq_table = cpufreq_frequency_get_table(policy->cpu); |
| 2289 | if (freq_table) { |
| 2290 | ret = cpufreq_frequency_table_cpuinfo(policy, |
| 2291 | freq_table); |
| 2292 | if (ret) { |
| 2293 | pr_err("%s: Policy frequency update failed\n", |
| 2294 | __func__); |
| 2295 | break; |
| 2296 | } |
| 2297 | policy->user_policy.max = policy->max; |
| 2298 | __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); |
| 2299 | } |
| 2300 | } |
| 2301 | |
| 2302 | return ret; |
| 2303 | } |
| 2304 | |
| 2305 | int cpufreq_boost_trigger_state(int state) |
| 2306 | { |
| 2307 | unsigned long flags; |
| 2308 | int ret = 0; |
| 2309 | |
| 2310 | if (cpufreq_driver->boost_enabled == state) |
| 2311 | return 0; |
| 2312 | |
| 2313 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
| 2314 | cpufreq_driver->boost_enabled = state; |
| 2315 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
| 2316 | |
| 2317 | ret = cpufreq_driver->set_boost(state); |
| 2318 | if (ret) { |
| 2319 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
| 2320 | cpufreq_driver->boost_enabled = !state; |
| 2321 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
| 2322 | |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 2323 | pr_err("%s: Cannot %s BOOST\n", |
| 2324 | __func__, state ? "enable" : "disable"); |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 2325 | } |
| 2326 | |
| 2327 | return ret; |
| 2328 | } |
| 2329 | |
| 2330 | int cpufreq_boost_supported(void) |
| 2331 | { |
| 2332 | if (likely(cpufreq_driver)) |
| 2333 | return cpufreq_driver->boost_supported; |
| 2334 | |
| 2335 | return 0; |
| 2336 | } |
| 2337 | EXPORT_SYMBOL_GPL(cpufreq_boost_supported); |
| 2338 | |
Viresh Kumar | 44139ed | 2015-07-29 16:23:09 +0530 | [diff] [blame] | 2339 | static int create_boost_sysfs_file(void) |
| 2340 | { |
| 2341 | int ret; |
| 2342 | |
| 2343 | if (!cpufreq_boost_supported()) |
| 2344 | return 0; |
| 2345 | |
| 2346 | /* |
| 2347 | * Check if driver provides function to enable boost - |
| 2348 | * if not, use cpufreq_boost_set_sw as default |
| 2349 | */ |
| 2350 | if (!cpufreq_driver->set_boost) |
| 2351 | cpufreq_driver->set_boost = cpufreq_boost_set_sw; |
| 2352 | |
Viresh Kumar | c82bd44 | 2015-10-15 21:35:23 +0530 | [diff] [blame] | 2353 | ret = sysfs_create_file(cpufreq_global_kobject, &boost.attr); |
Viresh Kumar | 44139ed | 2015-07-29 16:23:09 +0530 | [diff] [blame] | 2354 | if (ret) |
| 2355 | pr_err("%s: cannot register global BOOST sysfs file\n", |
| 2356 | __func__); |
| 2357 | |
| 2358 | return ret; |
| 2359 | } |
| 2360 | |
| 2361 | static void remove_boost_sysfs_file(void) |
| 2362 | { |
| 2363 | if (cpufreq_boost_supported()) |
Viresh Kumar | c82bd44 | 2015-10-15 21:35:23 +0530 | [diff] [blame] | 2364 | sysfs_remove_file(cpufreq_global_kobject, &boost.attr); |
Viresh Kumar | 44139ed | 2015-07-29 16:23:09 +0530 | [diff] [blame] | 2365 | } |
| 2366 | |
| 2367 | int cpufreq_enable_boost_support(void) |
| 2368 | { |
| 2369 | if (!cpufreq_driver) |
| 2370 | return -EINVAL; |
| 2371 | |
| 2372 | if (cpufreq_boost_supported()) |
| 2373 | return 0; |
| 2374 | |
| 2375 | cpufreq_driver->boost_supported = true; |
| 2376 | |
| 2377 | /* This will get removed on driver unregister */ |
| 2378 | return create_boost_sysfs_file(); |
| 2379 | } |
| 2380 | EXPORT_SYMBOL_GPL(cpufreq_enable_boost_support); |
| 2381 | |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 2382 | int cpufreq_boost_enabled(void) |
| 2383 | { |
| 2384 | return cpufreq_driver->boost_enabled; |
| 2385 | } |
| 2386 | EXPORT_SYMBOL_GPL(cpufreq_boost_enabled); |
| 2387 | |
| 2388 | /********************************************************************* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2389 | * REGISTER / UNREGISTER CPUFREQ DRIVER * |
| 2390 | *********************************************************************/ |
| 2391 | |
| 2392 | /** |
| 2393 | * cpufreq_register_driver - register a CPU Frequency driver |
| 2394 | * @driver_data: A struct cpufreq_driver containing the values# |
| 2395 | * submitted by the CPU Frequency driver. |
| 2396 | * |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 2397 | * Registers a CPU Frequency driver to this core code. This code |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2398 | * returns zero on success, -EBUSY when another driver got here first |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 2399 | * (and isn't unregistered in the meantime). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2400 | * |
| 2401 | */ |
Linus Torvalds | 221dee2 | 2007-02-26 14:55:48 -0800 | [diff] [blame] | 2402 | int cpufreq_register_driver(struct cpufreq_driver *driver_data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2403 | { |
| 2404 | unsigned long flags; |
| 2405 | int ret; |
| 2406 | |
Konrad Rzeszutek Wilk | a7b422c | 2012-03-13 19:18:39 -0400 | [diff] [blame] | 2407 | if (cpufreq_disabled()) |
| 2408 | return -ENODEV; |
| 2409 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2410 | if (!driver_data || !driver_data->verify || !driver_data->init || |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 2411 | !(driver_data->setpolicy || driver_data->target_index || |
Rafael J. Wysocki | 9832235 | 2014-03-19 12:48:30 +0100 | [diff] [blame] | 2412 | driver_data->target) || |
| 2413 | (driver_data->setpolicy && (driver_data->target_index || |
Viresh Kumar | 1c03a2d | 2014-06-02 22:49:28 +0530 | [diff] [blame] | 2414 | driver_data->target)) || |
| 2415 | (!!driver_data->get_intermediate != !!driver_data->target_intermediate)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2416 | return -EINVAL; |
| 2417 | |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 2418 | pr_debug("trying to register driver %s\n", driver_data->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2419 | |
Rafael J. Wysocki | fdd320d | 2015-07-30 01:45:07 +0200 | [diff] [blame] | 2420 | /* Protect against concurrent CPU online/offline. */ |
| 2421 | get_online_cpus(); |
| 2422 | |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 2423 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 2424 | if (cpufreq_driver) { |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 2425 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
Rafael J. Wysocki | fdd320d | 2015-07-30 01:45:07 +0200 | [diff] [blame] | 2426 | ret = -EEXIST; |
| 2427 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2428 | } |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 2429 | cpufreq_driver = driver_data; |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 2430 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2431 | |
Viresh Kumar | bc68b7d | 2015-01-02 12:34:30 +0530 | [diff] [blame] | 2432 | if (driver_data->setpolicy) |
| 2433 | driver_data->flags |= CPUFREQ_CONST_LOOPS; |
| 2434 | |
Viresh Kumar | 44139ed | 2015-07-29 16:23:09 +0530 | [diff] [blame] | 2435 | ret = create_boost_sysfs_file(); |
| 2436 | if (ret) |
| 2437 | goto err_null_driver; |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 2438 | |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 2439 | ret = subsys_interface_register(&cpufreq_interface); |
Jiri Slaby | 8f5bc2a | 2011-03-01 17:41:10 +0100 | [diff] [blame] | 2440 | if (ret) |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 2441 | goto err_boost_unreg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2442 | |
Viresh Kumar | ce1bcfe | 2015-01-02 12:34:35 +0530 | [diff] [blame] | 2443 | if (!(cpufreq_driver->flags & CPUFREQ_STICKY) && |
| 2444 | list_empty(&cpufreq_policy_list)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2445 | /* if all ->init() calls failed, unregister */ |
Viresh Kumar | ce1bcfe | 2015-01-02 12:34:35 +0530 | [diff] [blame] | 2446 | pr_debug("%s: No CPU initialized for driver %s\n", __func__, |
| 2447 | driver_data->name); |
| 2448 | goto err_if_unreg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2449 | } |
| 2450 | |
Jiri Slaby | 8f5bc2a | 2011-03-01 17:41:10 +0100 | [diff] [blame] | 2451 | register_hotcpu_notifier(&cpufreq_cpu_notifier); |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 2452 | pr_debug("driver %s up and running\n", driver_data->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2453 | |
Rafael J. Wysocki | fdd320d | 2015-07-30 01:45:07 +0200 | [diff] [blame] | 2454 | out: |
| 2455 | put_online_cpus(); |
| 2456 | return ret; |
| 2457 | |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 2458 | err_if_unreg: |
| 2459 | subsys_interface_unregister(&cpufreq_interface); |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 2460 | err_boost_unreg: |
Viresh Kumar | 44139ed | 2015-07-29 16:23:09 +0530 | [diff] [blame] | 2461 | remove_boost_sysfs_file(); |
Jiri Slaby | 8f5bc2a | 2011-03-01 17:41:10 +0100 | [diff] [blame] | 2462 | err_null_driver: |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 2463 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 2464 | cpufreq_driver = NULL; |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 2465 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
Rafael J. Wysocki | fdd320d | 2015-07-30 01:45:07 +0200 | [diff] [blame] | 2466 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2467 | } |
| 2468 | EXPORT_SYMBOL_GPL(cpufreq_register_driver); |
| 2469 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2470 | /** |
| 2471 | * cpufreq_unregister_driver - unregister the current CPUFreq driver |
| 2472 | * |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 2473 | * Unregister the current CPUFreq driver. Only call this if you have |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2474 | * the right to do so, i.e. if you have succeeded in initialising before! |
| 2475 | * Returns zero if successful, and -EINVAL if the cpufreq_driver is |
| 2476 | * currently not initialised. |
| 2477 | */ |
Linus Torvalds | 221dee2 | 2007-02-26 14:55:48 -0800 | [diff] [blame] | 2478 | int cpufreq_unregister_driver(struct cpufreq_driver *driver) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2479 | { |
| 2480 | unsigned long flags; |
| 2481 | |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 2482 | if (!cpufreq_driver || (driver != cpufreq_driver)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2483 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2484 | |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 2485 | pr_debug("unregistering driver %s\n", driver->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2486 | |
Sebastian Andrzej Siewior | 454d3a2 | 2015-07-22 17:59:11 +0200 | [diff] [blame] | 2487 | /* Protect against concurrent cpu hotplug */ |
| 2488 | get_online_cpus(); |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 2489 | subsys_interface_unregister(&cpufreq_interface); |
Viresh Kumar | 44139ed | 2015-07-29 16:23:09 +0530 | [diff] [blame] | 2490 | remove_boost_sysfs_file(); |
Chandra Seetharaman | 65edc68 | 2006-06-27 02:54:08 -0700 | [diff] [blame] | 2491 | unregister_hotcpu_notifier(&cpufreq_cpu_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2492 | |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 2493 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 2494 | |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 2495 | cpufreq_driver = NULL; |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 2496 | |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 2497 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
Sebastian Andrzej Siewior | 454d3a2 | 2015-07-22 17:59:11 +0200 | [diff] [blame] | 2498 | put_online_cpus(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2499 | |
| 2500 | return 0; |
| 2501 | } |
| 2502 | EXPORT_SYMBOL_GPL(cpufreq_unregister_driver); |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 2503 | |
Doug Anderson | 90de2a4 | 2014-12-23 22:09:48 -0800 | [diff] [blame] | 2504 | /* |
| 2505 | * Stop cpufreq at shutdown to make sure it isn't holding any locks |
| 2506 | * or mutexes when secondary CPUs are halted. |
| 2507 | */ |
| 2508 | static struct syscore_ops cpufreq_syscore_ops = { |
| 2509 | .shutdown = cpufreq_suspend, |
| 2510 | }; |
| 2511 | |
Viresh Kumar | c82bd44 | 2015-10-15 21:35:23 +0530 | [diff] [blame] | 2512 | struct kobject *cpufreq_global_kobject; |
| 2513 | EXPORT_SYMBOL(cpufreq_global_kobject); |
| 2514 | |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 2515 | static int __init cpufreq_core_init(void) |
| 2516 | { |
Konrad Rzeszutek Wilk | a7b422c | 2012-03-13 19:18:39 -0400 | [diff] [blame] | 2517 | if (cpufreq_disabled()) |
| 2518 | return -ENODEV; |
| 2519 | |
Viresh Kumar | 8eec102 | 2015-10-15 21:35:22 +0530 | [diff] [blame] | 2520 | cpufreq_global_kobject = kobject_create_and_add("cpufreq", &cpu_subsys.dev_root->kobj); |
Thomas Renninger | 8aa84ad | 2009-07-24 15:25:05 +0200 | [diff] [blame] | 2521 | BUG_ON(!cpufreq_global_kobject); |
| 2522 | |
Doug Anderson | 90de2a4 | 2014-12-23 22:09:48 -0800 | [diff] [blame] | 2523 | register_syscore_ops(&cpufreq_syscore_ops); |
| 2524 | |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 2525 | return 0; |
| 2526 | } |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 2527 | core_initcall(cpufreq_core_init); |