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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | /** |
Dave Jones | cd87847 | 2006-08-11 17:59:28 -0400 | [diff] [blame] | 35 | * The "cpufreq driver" - the arch- or hardware-dependent low |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | * level driver of CPUFreq support, and its spinlock. This lock |
| 37 | * also protects the cpufreq_cpu_data array. |
| 38 | */ |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 39 | static struct cpufreq_driver *cpufreq_driver; |
Mike Travis | 7a6aedf | 2008-03-25 15:06:53 -0700 | [diff] [blame] | 40 | static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data); |
Srivatsa S. Bhat | 8414809 | 2013-07-30 04:25:10 +0530 | [diff] [blame] | 41 | static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data_fallback); |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 42 | static DEFINE_RWLOCK(cpufreq_driver_lock); |
Jane Li | 6f1e4ef | 2014-01-03 17:17:41 +0800 | [diff] [blame] | 43 | DEFINE_MUTEX(cpufreq_governor_lock); |
Lukasz Majewski | c88a1f8 | 2013-08-06 22:53:08 +0530 | [diff] [blame] | 44 | static LIST_HEAD(cpufreq_policy_list); |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 45 | |
Thomas Renninger | 084f349 | 2007-07-09 11:35:28 -0700 | [diff] [blame] | 46 | /* This one keeps track of the previously set governor of a removed CPU */ |
Dmitry Monakhov | e77b89f | 2009-10-05 00:38:55 +0400 | [diff] [blame] | 47 | static DEFINE_PER_CPU(char[CPUFREQ_NAME_LEN], cpufreq_cpu_governor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 49 | /* Flag to suspend/resume CPUFreq governors */ |
| 50 | static bool cpufreq_suspended; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 52 | static inline bool has_target(void) |
| 53 | { |
| 54 | return cpufreq_driver->target_index || cpufreq_driver->target; |
| 55 | } |
| 56 | |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 57 | /* |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 58 | * rwsem to guarantee that cpufreq driver module doesn't unload during critical |
| 59 | * sections |
| 60 | */ |
| 61 | static DECLARE_RWSEM(cpufreq_rwsem); |
| 62 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | /* internal prototypes */ |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 64 | static int __cpufreq_governor(struct cpufreq_policy *policy, |
| 65 | unsigned int event); |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 66 | static unsigned int __cpufreq_get(unsigned int cpu); |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 67 | static void handle_update(struct work_struct *work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
| 69 | /** |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 70 | * Two notifier lists: the "policy" list is involved in the |
| 71 | * validation process for a new CPU frequency policy; the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | * "transition" list for kernel code that needs to handle |
| 73 | * changes to devices when the CPU clock speed changes. |
| 74 | * The mutex locks both lists. |
| 75 | */ |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 76 | static BLOCKING_NOTIFIER_HEAD(cpufreq_policy_notifier_list); |
Alan Stern | b4dfdbb | 2006-10-04 02:17:06 -0700 | [diff] [blame] | 77 | static struct srcu_notifier_head cpufreq_transition_notifier_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
Cesar Eduardo Barros | 74212ca | 2008-02-16 08:41:24 -0200 | [diff] [blame] | 79 | static bool init_cpufreq_transition_notifier_list_called; |
Alan Stern | b4dfdbb | 2006-10-04 02:17:06 -0700 | [diff] [blame] | 80 | static int __init init_cpufreq_transition_notifier_list(void) |
| 81 | { |
| 82 | srcu_init_notifier_head(&cpufreq_transition_notifier_list); |
Cesar Eduardo Barros | 74212ca | 2008-02-16 08:41:24 -0200 | [diff] [blame] | 83 | init_cpufreq_transition_notifier_list_called = true; |
Alan Stern | b4dfdbb | 2006-10-04 02:17:06 -0700 | [diff] [blame] | 84 | return 0; |
| 85 | } |
Linus Torvalds | b3438f8 | 2006-11-20 11:47:18 -0800 | [diff] [blame] | 86 | pure_initcall(init_cpufreq_transition_notifier_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
Konrad Rzeszutek Wilk | a7b422c | 2012-03-13 19:18:39 -0400 | [diff] [blame] | 88 | static int off __read_mostly; |
Viresh Kumar | da58445 | 2012-10-26 00:51:32 +0200 | [diff] [blame] | 89 | static int cpufreq_disabled(void) |
Konrad Rzeszutek Wilk | a7b422c | 2012-03-13 19:18:39 -0400 | [diff] [blame] | 90 | { |
| 91 | return off; |
| 92 | } |
| 93 | void disable_cpufreq(void) |
| 94 | { |
| 95 | off = 1; |
| 96 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | static LIST_HEAD(cpufreq_governor_list); |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 98 | static DEFINE_MUTEX(cpufreq_governor_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 100 | bool have_governor_per_policy(void) |
| 101 | { |
Viresh Kumar | 0b981e7 | 2013-10-02 14:13:18 +0530 | [diff] [blame] | 102 | return !!(cpufreq_driver->flags & CPUFREQ_HAVE_GOVERNOR_PER_POLICY); |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 103 | } |
Viresh Kumar | 3f869d6 | 2013-05-16 05:09:56 +0000 | [diff] [blame] | 104 | EXPORT_SYMBOL_GPL(have_governor_per_policy); |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 105 | |
Viresh Kumar | 944e9a0 | 2013-05-16 05:09:57 +0000 | [diff] [blame] | 106 | struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy) |
| 107 | { |
| 108 | if (have_governor_per_policy()) |
| 109 | return &policy->kobj; |
| 110 | else |
| 111 | return cpufreq_global_kobject; |
| 112 | } |
| 113 | EXPORT_SYMBOL_GPL(get_governor_parent_kobj); |
| 114 | |
Viresh Kumar | 72a4ce3 | 2013-05-17 11:26:32 +0000 | [diff] [blame] | 115 | static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall) |
| 116 | { |
| 117 | u64 idle_time; |
| 118 | u64 cur_wall_time; |
| 119 | u64 busy_time; |
| 120 | |
| 121 | cur_wall_time = jiffies64_to_cputime64(get_jiffies_64()); |
| 122 | |
| 123 | busy_time = kcpustat_cpu(cpu).cpustat[CPUTIME_USER]; |
| 124 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SYSTEM]; |
| 125 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_IRQ]; |
| 126 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SOFTIRQ]; |
| 127 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_STEAL]; |
| 128 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE]; |
| 129 | |
| 130 | idle_time = cur_wall_time - busy_time; |
| 131 | if (wall) |
| 132 | *wall = cputime_to_usecs(cur_wall_time); |
| 133 | |
| 134 | return cputime_to_usecs(idle_time); |
| 135 | } |
| 136 | |
| 137 | u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy) |
| 138 | { |
| 139 | u64 idle_time = get_cpu_idle_time_us(cpu, io_busy ? wall : NULL); |
| 140 | |
| 141 | if (idle_time == -1ULL) |
| 142 | return get_cpu_idle_time_jiffy(cpu, wall); |
| 143 | else if (!io_busy) |
| 144 | idle_time += get_cpu_iowait_time_us(cpu, wall); |
| 145 | |
| 146 | return idle_time; |
| 147 | } |
| 148 | EXPORT_SYMBOL_GPL(get_cpu_idle_time); |
| 149 | |
Viresh Kumar | 70e9e77 | 2013-10-03 20:29:07 +0530 | [diff] [blame] | 150 | /* |
| 151 | * This is a generic cpufreq init() routine which can be used by cpufreq |
| 152 | * drivers of SMP systems. It will do following: |
| 153 | * - validate & show freq table passed |
| 154 | * - set policies transition latency |
| 155 | * - policy->cpus with all possible CPUs |
| 156 | */ |
| 157 | int cpufreq_generic_init(struct cpufreq_policy *policy, |
| 158 | struct cpufreq_frequency_table *table, |
| 159 | unsigned int transition_latency) |
| 160 | { |
| 161 | int ret; |
| 162 | |
| 163 | ret = cpufreq_table_validate_and_show(policy, table); |
| 164 | if (ret) { |
| 165 | pr_err("%s: invalid frequency table: %d\n", __func__, ret); |
| 166 | return ret; |
| 167 | } |
| 168 | |
| 169 | policy->cpuinfo.transition_latency = transition_latency; |
| 170 | |
| 171 | /* |
| 172 | * The driver only supports the SMP configuartion where all processors |
| 173 | * share the clock and voltage and clock. |
| 174 | */ |
| 175 | cpumask_setall(policy->cpus); |
| 176 | |
| 177 | return 0; |
| 178 | } |
| 179 | EXPORT_SYMBOL_GPL(cpufreq_generic_init); |
| 180 | |
Viresh Kumar | 652ed95 | 2014-01-09 20:38:43 +0530 | [diff] [blame] | 181 | unsigned int cpufreq_generic_get(unsigned int cpu) |
| 182 | { |
| 183 | struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); |
| 184 | |
| 185 | if (!policy || IS_ERR(policy->clk)) { |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 186 | pr_err("%s: No %s associated to cpu: %d\n", |
| 187 | __func__, policy ? "clk" : "policy", cpu); |
Viresh Kumar | 652ed95 | 2014-01-09 20:38:43 +0530 | [diff] [blame] | 188 | return 0; |
| 189 | } |
| 190 | |
| 191 | return clk_get_rate(policy->clk) / 1000; |
| 192 | } |
| 193 | EXPORT_SYMBOL_GPL(cpufreq_generic_get); |
| 194 | |
Viresh Kumar | e0b3165 | 2014-03-10 14:53:33 +0530 | [diff] [blame] | 195 | /* Only for cpufreq core internal use */ |
| 196 | struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu) |
| 197 | { |
| 198 | return per_cpu(cpufreq_cpu_data, cpu); |
| 199 | } |
| 200 | |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 201 | struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | { |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 203 | struct cpufreq_policy *policy = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | unsigned long flags; |
| 205 | |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 206 | if (cpufreq_disabled() || (cpu >= nr_cpu_ids)) |
| 207 | return NULL; |
| 208 | |
| 209 | if (!down_read_trylock(&cpufreq_rwsem)) |
| 210 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | |
| 212 | /* get the cpufreq driver */ |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 213 | read_lock_irqsave(&cpufreq_driver_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 215 | if (cpufreq_driver) { |
| 216 | /* get the CPU */ |
| 217 | policy = per_cpu(cpufreq_cpu_data, cpu); |
| 218 | if (policy) |
| 219 | kobject_get(&policy->kobj); |
| 220 | } |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 221 | |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 222 | read_unlock_irqrestore(&cpufreq_driver_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 224 | if (!policy) |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 225 | up_read(&cpufreq_rwsem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 227 | return policy; |
Stephen Boyd | a914443 | 2012-07-20 18:14:38 +0000 | [diff] [blame] | 228 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | EXPORT_SYMBOL_GPL(cpufreq_cpu_get); |
| 230 | |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 231 | void cpufreq_cpu_put(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | { |
Dirk Brandewie | d5aaffa | 2013-01-17 16:22:21 +0000 | [diff] [blame] | 233 | if (cpufreq_disabled()) |
| 234 | return; |
| 235 | |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 236 | kobject_put(&policy->kobj); |
| 237 | up_read(&cpufreq_rwsem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | } |
| 239 | EXPORT_SYMBOL_GPL(cpufreq_cpu_put); |
| 240 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | /********************************************************************* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | * EXTERNALLY AFFECTING FREQUENCY CHANGES * |
| 243 | *********************************************************************/ |
| 244 | |
| 245 | /** |
| 246 | * adjust_jiffies - adjust the system "loops_per_jiffy" |
| 247 | * |
| 248 | * This function alters the system "loops_per_jiffy" for the clock |
| 249 | * speed change. Note that loops_per_jiffy cannot be updated on SMP |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 250 | * systems as each CPU might be scaled differently. So, use the arch |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | * per-CPU loops_per_jiffy value wherever possible. |
| 252 | */ |
| 253 | #ifndef CONFIG_SMP |
| 254 | static unsigned long l_p_j_ref; |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 255 | static unsigned int l_p_j_ref_freq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 257 | static void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | { |
| 259 | if (ci->flags & CPUFREQ_CONST_LOOPS) |
| 260 | return; |
| 261 | |
| 262 | if (!l_p_j_ref_freq) { |
| 263 | l_p_j_ref = loops_per_jiffy; |
| 264 | l_p_j_ref_freq = ci->old; |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 265 | pr_debug("saving %lu as reference value for loops_per_jiffy; freq is %u kHz\n", |
| 266 | l_p_j_ref, l_p_j_ref_freq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | } |
Viresh Kumar | 0b443ea | 2014-03-19 11:24:58 +0530 | [diff] [blame] | 268 | if (val == CPUFREQ_POSTCHANGE && ci->old != ci->new) { |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 269 | loops_per_jiffy = cpufreq_scale(l_p_j_ref, l_p_j_ref_freq, |
| 270 | ci->new); |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 271 | pr_debug("scaling loops_per_jiffy to %lu for frequency %u kHz\n", |
| 272 | loops_per_jiffy, ci->new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | } |
| 274 | } |
| 275 | #else |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 276 | static inline void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci) |
| 277 | { |
| 278 | return; |
| 279 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | #endif |
| 281 | |
Viresh Kumar | 0956df9c | 2013-06-19 14:19:34 +0530 | [diff] [blame] | 282 | static void __cpufreq_notify_transition(struct cpufreq_policy *policy, |
Viresh Kumar | b43a7ff | 2013-03-24 11:56:43 +0530 | [diff] [blame] | 283 | struct cpufreq_freqs *freqs, unsigned int state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | { |
| 285 | BUG_ON(irqs_disabled()); |
| 286 | |
Dirk Brandewie | d5aaffa | 2013-01-17 16:22:21 +0000 | [diff] [blame] | 287 | if (cpufreq_disabled()) |
| 288 | return; |
| 289 | |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 290 | freqs->flags = cpufreq_driver->flags; |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 291 | pr_debug("notification %u of frequency transition to %u kHz\n", |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 292 | state, freqs->new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | switch (state) { |
Dave Jones | e4472cb | 2006-01-31 15:53:55 -0800 | [diff] [blame] | 295 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | case CPUFREQ_PRECHANGE: |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 297 | /* detect if the driver reported a value as "old frequency" |
Dave Jones | e4472cb | 2006-01-31 15:53:55 -0800 | [diff] [blame] | 298 | * which is not equal to what the cpufreq core thinks is |
| 299 | * "old frequency". |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | */ |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 301 | if (!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) { |
Dave Jones | e4472cb | 2006-01-31 15:53:55 -0800 | [diff] [blame] | 302 | if ((policy) && (policy->cpu == freqs->cpu) && |
| 303 | (policy->cur) && (policy->cur != freqs->old)) { |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 304 | pr_debug("Warning: CPU frequency is %u, cpufreq assumed %u kHz\n", |
| 305 | freqs->old, policy->cur); |
Dave Jones | e4472cb | 2006-01-31 15:53:55 -0800 | [diff] [blame] | 306 | freqs->old = policy->cur; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | } |
| 308 | } |
Alan Stern | b4dfdbb | 2006-10-04 02:17:06 -0700 | [diff] [blame] | 309 | srcu_notifier_call_chain(&cpufreq_transition_notifier_list, |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 310 | CPUFREQ_PRECHANGE, freqs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | adjust_jiffies(CPUFREQ_PRECHANGE, freqs); |
| 312 | break; |
Dave Jones | e4472cb | 2006-01-31 15:53:55 -0800 | [diff] [blame] | 313 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | case CPUFREQ_POSTCHANGE: |
| 315 | adjust_jiffies(CPUFREQ_POSTCHANGE, freqs); |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 316 | pr_debug("FREQ: %lu - CPU: %lu\n", |
| 317 | (unsigned long)freqs->new, (unsigned long)freqs->cpu); |
Thomas Renninger | 25e4193 | 2011-01-03 17:50:44 +0100 | [diff] [blame] | 318 | trace_cpu_frequency(freqs->new, freqs->cpu); |
Alan Stern | b4dfdbb | 2006-10-04 02:17:06 -0700 | [diff] [blame] | 319 | srcu_notifier_call_chain(&cpufreq_transition_notifier_list, |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 320 | CPUFREQ_POSTCHANGE, freqs); |
Dave Jones | e4472cb | 2006-01-31 15:53:55 -0800 | [diff] [blame] | 321 | if (likely(policy) && likely(policy->cpu == freqs->cpu)) |
| 322 | policy->cur = freqs->new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | break; |
| 324 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | } |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 326 | |
Viresh Kumar | b43a7ff | 2013-03-24 11:56:43 +0530 | [diff] [blame] | 327 | /** |
| 328 | * cpufreq_notify_transition - call notifier chain and adjust_jiffies |
| 329 | * on frequency transition. |
| 330 | * |
| 331 | * This function calls the transition notifiers and the "adjust_jiffies" |
| 332 | * function. It is called twice on all CPU frequency changes that have |
| 333 | * external effects. |
| 334 | */ |
Viresh Kumar | 236a980 | 2014-03-24 13:35:46 +0530 | [diff] [blame] | 335 | static void cpufreq_notify_transition(struct cpufreq_policy *policy, |
Viresh Kumar | b43a7ff | 2013-03-24 11:56:43 +0530 | [diff] [blame] | 336 | struct cpufreq_freqs *freqs, unsigned int state) |
| 337 | { |
| 338 | for_each_cpu(freqs->cpu, policy->cpus) |
| 339 | __cpufreq_notify_transition(policy, freqs, state); |
| 340 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | |
Viresh Kumar | f7ba3b4 | 2013-12-02 11:04:12 +0530 | [diff] [blame] | 342 | /* Do post notifications when there are chances that transition has failed */ |
Viresh Kumar | 236a980 | 2014-03-24 13:35:46 +0530 | [diff] [blame] | 343 | static void cpufreq_notify_post_transition(struct cpufreq_policy *policy, |
Viresh Kumar | f7ba3b4 | 2013-12-02 11:04:12 +0530 | [diff] [blame] | 344 | struct cpufreq_freqs *freqs, int transition_failed) |
| 345 | { |
| 346 | cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE); |
| 347 | if (!transition_failed) |
| 348 | return; |
| 349 | |
| 350 | swap(freqs->old, freqs->new); |
| 351 | cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE); |
| 352 | cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE); |
| 353 | } |
Viresh Kumar | f7ba3b4 | 2013-12-02 11:04:12 +0530 | [diff] [blame] | 354 | |
Srivatsa S. Bhat | 12478cf | 2014-03-24 13:35:44 +0530 | [diff] [blame] | 355 | void cpufreq_freq_transition_begin(struct cpufreq_policy *policy, |
| 356 | struct cpufreq_freqs *freqs) |
| 357 | { |
Srivatsa S. Bhat | ca654dc | 2014-05-05 12:52:39 +0530 | [diff] [blame] | 358 | |
| 359 | /* |
| 360 | * Catch double invocations of _begin() which lead to self-deadlock. |
| 361 | * ASYNC_NOTIFICATION drivers are left out because the cpufreq core |
| 362 | * doesn't invoke _begin() on their behalf, and hence the chances of |
| 363 | * double invocations are very low. Moreover, there are scenarios |
| 364 | * where these checks can emit false-positive warnings in these |
| 365 | * drivers; so we avoid that by skipping them altogether. |
| 366 | */ |
| 367 | WARN_ON(!(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION) |
| 368 | && current == policy->transition_task); |
| 369 | |
Srivatsa S. Bhat | 12478cf | 2014-03-24 13:35:44 +0530 | [diff] [blame] | 370 | wait: |
| 371 | wait_event(policy->transition_wait, !policy->transition_ongoing); |
| 372 | |
| 373 | spin_lock(&policy->transition_lock); |
| 374 | |
| 375 | if (unlikely(policy->transition_ongoing)) { |
| 376 | spin_unlock(&policy->transition_lock); |
| 377 | goto wait; |
| 378 | } |
| 379 | |
| 380 | policy->transition_ongoing = true; |
Srivatsa S. Bhat | ca654dc | 2014-05-05 12:52:39 +0530 | [diff] [blame] | 381 | policy->transition_task = current; |
Srivatsa S. Bhat | 12478cf | 2014-03-24 13:35:44 +0530 | [diff] [blame] | 382 | |
| 383 | spin_unlock(&policy->transition_lock); |
| 384 | |
| 385 | cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE); |
| 386 | } |
| 387 | EXPORT_SYMBOL_GPL(cpufreq_freq_transition_begin); |
| 388 | |
| 389 | void cpufreq_freq_transition_end(struct cpufreq_policy *policy, |
| 390 | struct cpufreq_freqs *freqs, int transition_failed) |
| 391 | { |
| 392 | if (unlikely(WARN_ON(!policy->transition_ongoing))) |
| 393 | return; |
| 394 | |
| 395 | cpufreq_notify_post_transition(policy, freqs, transition_failed); |
| 396 | |
| 397 | policy->transition_ongoing = false; |
Srivatsa S. Bhat | ca654dc | 2014-05-05 12:52:39 +0530 | [diff] [blame] | 398 | policy->transition_task = NULL; |
Srivatsa S. Bhat | 12478cf | 2014-03-24 13:35:44 +0530 | [diff] [blame] | 399 | |
| 400 | wake_up(&policy->transition_wait); |
| 401 | } |
| 402 | EXPORT_SYMBOL_GPL(cpufreq_freq_transition_end); |
| 403 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | /********************************************************************* |
| 406 | * SYSFS INTERFACE * |
| 407 | *********************************************************************/ |
Rashika Kheria | 8a5c74a | 2014-02-26 22:12:42 +0530 | [diff] [blame] | 408 | static ssize_t show_boost(struct kobject *kobj, |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 409 | struct attribute *attr, char *buf) |
| 410 | { |
| 411 | return sprintf(buf, "%d\n", cpufreq_driver->boost_enabled); |
| 412 | } |
| 413 | |
| 414 | static ssize_t store_boost(struct kobject *kobj, struct attribute *attr, |
| 415 | const char *buf, size_t count) |
| 416 | { |
| 417 | int ret, enable; |
| 418 | |
| 419 | ret = sscanf(buf, "%d", &enable); |
| 420 | if (ret != 1 || enable < 0 || enable > 1) |
| 421 | return -EINVAL; |
| 422 | |
| 423 | if (cpufreq_boost_trigger_state(enable)) { |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 424 | pr_err("%s: Cannot %s BOOST!\n", |
| 425 | __func__, enable ? "enable" : "disable"); |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 426 | return -EINVAL; |
| 427 | } |
| 428 | |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 429 | pr_debug("%s: cpufreq BOOST %s\n", |
| 430 | __func__, enable ? "enabled" : "disabled"); |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 431 | |
| 432 | return count; |
| 433 | } |
| 434 | define_one_global_rw(boost); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 436 | static struct cpufreq_governor *__find_governor(const char *str_governor) |
| 437 | { |
| 438 | struct cpufreq_governor *t; |
| 439 | |
| 440 | list_for_each_entry(t, &cpufreq_governor_list, governor_list) |
Rasmus Villemoes | 7c4f453 | 2014-09-29 15:50:11 +0200 | [diff] [blame] | 441 | if (!strncasecmp(str_governor, t->name, CPUFREQ_NAME_LEN)) |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 442 | return t; |
| 443 | |
| 444 | return NULL; |
| 445 | } |
| 446 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | /** |
| 448 | * cpufreq_parse_governor - parse a governor string |
| 449 | */ |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 450 | static int cpufreq_parse_governor(char *str_governor, unsigned int *policy, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | struct cpufreq_governor **governor) |
| 452 | { |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 453 | int err = -EINVAL; |
| 454 | |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 455 | if (!cpufreq_driver) |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 456 | goto out; |
| 457 | |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 458 | if (cpufreq_driver->setpolicy) { |
Rasmus Villemoes | 7c4f453 | 2014-09-29 15:50:11 +0200 | [diff] [blame] | 459 | if (!strncasecmp(str_governor, "performance", CPUFREQ_NAME_LEN)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | *policy = CPUFREQ_POLICY_PERFORMANCE; |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 461 | err = 0; |
Rasmus Villemoes | 7c4f453 | 2014-09-29 15:50:11 +0200 | [diff] [blame] | 462 | } else if (!strncasecmp(str_governor, "powersave", |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 463 | CPUFREQ_NAME_LEN)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | *policy = CPUFREQ_POLICY_POWERSAVE; |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 465 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | } |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 467 | } else if (has_target()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | struct cpufreq_governor *t; |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 469 | |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 470 | mutex_lock(&cpufreq_governor_mutex); |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 471 | |
| 472 | t = __find_governor(str_governor); |
| 473 | |
Jeremy Fitzhardinge | ea71497 | 2006-07-06 12:32:01 -0700 | [diff] [blame] | 474 | if (t == NULL) { |
Kees Cook | 1a8e146 | 2011-05-04 08:38:56 -0700 | [diff] [blame] | 475 | int ret; |
Jeremy Fitzhardinge | ea71497 | 2006-07-06 12:32:01 -0700 | [diff] [blame] | 476 | |
Kees Cook | 1a8e146 | 2011-05-04 08:38:56 -0700 | [diff] [blame] | 477 | mutex_unlock(&cpufreq_governor_mutex); |
| 478 | ret = request_module("cpufreq_%s", str_governor); |
| 479 | mutex_lock(&cpufreq_governor_mutex); |
Jeremy Fitzhardinge | ea71497 | 2006-07-06 12:32:01 -0700 | [diff] [blame] | 480 | |
Kees Cook | 1a8e146 | 2011-05-04 08:38:56 -0700 | [diff] [blame] | 481 | if (ret == 0) |
| 482 | t = __find_governor(str_governor); |
Jeremy Fitzhardinge | ea71497 | 2006-07-06 12:32:01 -0700 | [diff] [blame] | 483 | } |
| 484 | |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 485 | if (t != NULL) { |
| 486 | *governor = t; |
| 487 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | } |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 489 | |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 490 | mutex_unlock(&cpufreq_governor_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | } |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 492 | out: |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 493 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | /** |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 497 | * cpufreq_per_cpu_attr_read() / show_##file_name() - |
| 498 | * print out cpufreq information |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | * |
| 500 | * Write out information from cpufreq_driver->policy[cpu]; object must be |
| 501 | * "unsigned int". |
| 502 | */ |
| 503 | |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 504 | #define show_one(file_name, object) \ |
| 505 | static ssize_t show_##file_name \ |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 506 | (struct cpufreq_policy *policy, char *buf) \ |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 507 | { \ |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 508 | return sprintf(buf, "%u\n", policy->object); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | } |
| 510 | |
| 511 | show_one(cpuinfo_min_freq, cpuinfo.min_freq); |
| 512 | show_one(cpuinfo_max_freq, cpuinfo.max_freq); |
Thomas Renninger | ed12978 | 2009-02-04 01:17:41 +0100 | [diff] [blame] | 513 | show_one(cpuinfo_transition_latency, cpuinfo.transition_latency); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | show_one(scaling_min_freq, min); |
| 515 | show_one(scaling_max_freq, max); |
Dirk Brandewie | c034b02 | 2014-10-13 08:37:40 -0700 | [diff] [blame] | 516 | |
| 517 | static ssize_t show_scaling_cur_freq( |
| 518 | struct cpufreq_policy *policy, char *buf) |
| 519 | { |
| 520 | ssize_t ret; |
| 521 | |
| 522 | if (cpufreq_driver && cpufreq_driver->setpolicy && cpufreq_driver->get) |
| 523 | ret = sprintf(buf, "%u\n", cpufreq_driver->get(policy->cpu)); |
| 524 | else |
| 525 | ret = sprintf(buf, "%u\n", policy->cur); |
| 526 | return ret; |
| 527 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | |
Viresh Kumar | 037ce83 | 2013-10-02 14:13:16 +0530 | [diff] [blame] | 529 | static int cpufreq_set_policy(struct cpufreq_policy *policy, |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 530 | struct cpufreq_policy *new_policy); |
Thomas Renninger | 7970e08 | 2006-04-13 15:14:04 +0200 | [diff] [blame] | 531 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | /** |
| 533 | * cpufreq_per_cpu_attr_write() / store_##file_name() - sysfs write access |
| 534 | */ |
| 535 | #define store_one(file_name, object) \ |
| 536 | static ssize_t store_##file_name \ |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 537 | (struct cpufreq_policy *policy, const char *buf, size_t count) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | { \ |
Vince Hsu | 619c144c | 2014-11-10 14:14:50 +0800 | [diff] [blame] | 539 | int ret, temp; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | struct cpufreq_policy new_policy; \ |
| 541 | \ |
| 542 | ret = cpufreq_get_policy(&new_policy, policy->cpu); \ |
| 543 | if (ret) \ |
| 544 | return -EINVAL; \ |
| 545 | \ |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 546 | ret = sscanf(buf, "%u", &new_policy.object); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | if (ret != 1) \ |
| 548 | return -EINVAL; \ |
| 549 | \ |
Vince Hsu | 619c144c | 2014-11-10 14:14:50 +0800 | [diff] [blame] | 550 | temp = new_policy.object; \ |
Viresh Kumar | 037ce83 | 2013-10-02 14:13:16 +0530 | [diff] [blame] | 551 | ret = cpufreq_set_policy(policy, &new_policy); \ |
Vince Hsu | 619c144c | 2014-11-10 14:14:50 +0800 | [diff] [blame] | 552 | if (!ret) \ |
| 553 | policy->user_policy.object = temp; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | \ |
| 555 | return ret ? ret : count; \ |
| 556 | } |
| 557 | |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 558 | store_one(scaling_min_freq, min); |
| 559 | store_one(scaling_max_freq, max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | |
| 561 | /** |
| 562 | * show_cpuinfo_cur_freq - current CPU frequency as detected by hardware |
| 563 | */ |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 564 | static ssize_t show_cpuinfo_cur_freq(struct cpufreq_policy *policy, |
| 565 | char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | { |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 567 | unsigned int cur_freq = __cpufreq_get(policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | if (!cur_freq) |
| 569 | return sprintf(buf, "<unknown>"); |
| 570 | return sprintf(buf, "%u\n", cur_freq); |
| 571 | } |
| 572 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | /** |
| 574 | * show_scaling_governor - show the current policy for the specified CPU |
| 575 | */ |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 576 | static ssize_t show_scaling_governor(struct cpufreq_policy *policy, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | { |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 578 | if (policy->policy == CPUFREQ_POLICY_POWERSAVE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | return sprintf(buf, "powersave\n"); |
| 580 | else if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) |
| 581 | return sprintf(buf, "performance\n"); |
| 582 | else if (policy->governor) |
viresh kumar | 4b972f0 | 2012-10-23 01:23:43 +0200 | [diff] [blame] | 583 | return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 584 | policy->governor->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | return -EINVAL; |
| 586 | } |
| 587 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | /** |
| 589 | * store_scaling_governor - store policy for the specified CPU |
| 590 | */ |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 591 | static ssize_t store_scaling_governor(struct cpufreq_policy *policy, |
| 592 | const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | { |
Srivatsa S. Bhat | 5136fa5 | 2013-09-07 01:24:06 +0530 | [diff] [blame] | 594 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | char str_governor[16]; |
| 596 | struct cpufreq_policy new_policy; |
| 597 | |
| 598 | ret = cpufreq_get_policy(&new_policy, policy->cpu); |
| 599 | if (ret) |
| 600 | return ret; |
| 601 | |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 602 | ret = sscanf(buf, "%15s", str_governor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | if (ret != 1) |
| 604 | return -EINVAL; |
| 605 | |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 606 | if (cpufreq_parse_governor(str_governor, &new_policy.policy, |
| 607 | &new_policy.governor)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | return -EINVAL; |
| 609 | |
Viresh Kumar | 037ce83 | 2013-10-02 14:13:16 +0530 | [diff] [blame] | 610 | ret = cpufreq_set_policy(policy, &new_policy); |
Thomas Renninger | 7970e08 | 2006-04-13 15:14:04 +0200 | [diff] [blame] | 611 | |
| 612 | policy->user_policy.policy = policy->policy; |
| 613 | policy->user_policy.governor = policy->governor; |
Thomas Renninger | 7970e08 | 2006-04-13 15:14:04 +0200 | [diff] [blame] | 614 | |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 615 | if (ret) |
| 616 | return ret; |
| 617 | else |
| 618 | return count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | } |
| 620 | |
| 621 | /** |
| 622 | * show_scaling_driver - show the cpufreq driver currently loaded |
| 623 | */ |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 624 | static ssize_t show_scaling_driver(struct cpufreq_policy *policy, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | { |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 626 | return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", cpufreq_driver->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | } |
| 628 | |
| 629 | /** |
| 630 | * show_scaling_available_governors - show the available CPUfreq governors |
| 631 | */ |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 632 | static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy, |
| 633 | char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | { |
| 635 | ssize_t i = 0; |
| 636 | struct cpufreq_governor *t; |
| 637 | |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 638 | if (!has_target()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | i += sprintf(buf, "performance powersave"); |
| 640 | goto out; |
| 641 | } |
| 642 | |
| 643 | list_for_each_entry(t, &cpufreq_governor_list, governor_list) { |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 644 | if (i >= (ssize_t) ((PAGE_SIZE / sizeof(char)) |
| 645 | - (CPUFREQ_NAME_LEN + 2))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | goto out; |
viresh kumar | 4b972f0 | 2012-10-23 01:23:43 +0200 | [diff] [blame] | 647 | i += scnprintf(&buf[i], CPUFREQ_NAME_PLEN, "%s ", t->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | } |
Dave Jones | 7d5e350 | 2006-02-02 17:03:42 -0500 | [diff] [blame] | 649 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | i += sprintf(&buf[i], "\n"); |
| 651 | return i; |
| 652 | } |
Darrick J. Wong | e8628dd | 2008-04-18 13:31:12 -0700 | [diff] [blame] | 653 | |
Lan Tianyu | f4fd379 | 2013-06-27 15:08:54 +0800 | [diff] [blame] | 654 | ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | { |
| 656 | ssize_t i = 0; |
| 657 | unsigned int cpu; |
| 658 | |
Rusty Russell | 835481d | 2009-01-04 05:18:06 -0800 | [diff] [blame] | 659 | for_each_cpu(cpu, mask) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | if (i) |
| 661 | i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), " "); |
| 662 | i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), "%u", cpu); |
| 663 | if (i >= (PAGE_SIZE - 5)) |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 664 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | } |
| 666 | i += sprintf(&buf[i], "\n"); |
| 667 | return i; |
| 668 | } |
Lan Tianyu | f4fd379 | 2013-06-27 15:08:54 +0800 | [diff] [blame] | 669 | EXPORT_SYMBOL_GPL(cpufreq_show_cpus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | |
Darrick J. Wong | e8628dd | 2008-04-18 13:31:12 -0700 | [diff] [blame] | 671 | /** |
| 672 | * show_related_cpus - show the CPUs affected by each transition even if |
| 673 | * hw coordination is in use |
| 674 | */ |
| 675 | static ssize_t show_related_cpus(struct cpufreq_policy *policy, char *buf) |
| 676 | { |
Lan Tianyu | f4fd379 | 2013-06-27 15:08:54 +0800 | [diff] [blame] | 677 | return cpufreq_show_cpus(policy->related_cpus, buf); |
Darrick J. Wong | e8628dd | 2008-04-18 13:31:12 -0700 | [diff] [blame] | 678 | } |
| 679 | |
| 680 | /** |
| 681 | * show_affected_cpus - show the CPUs affected by each transition |
| 682 | */ |
| 683 | static ssize_t show_affected_cpus(struct cpufreq_policy *policy, char *buf) |
| 684 | { |
Lan Tianyu | f4fd379 | 2013-06-27 15:08:54 +0800 | [diff] [blame] | 685 | return cpufreq_show_cpus(policy->cpus, buf); |
Darrick J. Wong | e8628dd | 2008-04-18 13:31:12 -0700 | [diff] [blame] | 686 | } |
| 687 | |
Venki Pallipadi | 9e76988 | 2007-10-26 10:18:21 -0700 | [diff] [blame] | 688 | static ssize_t store_scaling_setspeed(struct cpufreq_policy *policy, |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 689 | const char *buf, size_t count) |
Venki Pallipadi | 9e76988 | 2007-10-26 10:18:21 -0700 | [diff] [blame] | 690 | { |
| 691 | unsigned int freq = 0; |
| 692 | unsigned int ret; |
| 693 | |
CHIKAMA masaki | 879000f | 2008-06-05 22:46:33 -0700 | [diff] [blame] | 694 | if (!policy->governor || !policy->governor->store_setspeed) |
Venki Pallipadi | 9e76988 | 2007-10-26 10:18:21 -0700 | [diff] [blame] | 695 | return -EINVAL; |
| 696 | |
| 697 | ret = sscanf(buf, "%u", &freq); |
| 698 | if (ret != 1) |
| 699 | return -EINVAL; |
| 700 | |
| 701 | policy->governor->store_setspeed(policy, freq); |
| 702 | |
| 703 | return count; |
| 704 | } |
| 705 | |
| 706 | static ssize_t show_scaling_setspeed(struct cpufreq_policy *policy, char *buf) |
| 707 | { |
CHIKAMA masaki | 879000f | 2008-06-05 22:46:33 -0700 | [diff] [blame] | 708 | if (!policy->governor || !policy->governor->show_setspeed) |
Venki Pallipadi | 9e76988 | 2007-10-26 10:18:21 -0700 | [diff] [blame] | 709 | return sprintf(buf, "<unsupported>\n"); |
| 710 | |
| 711 | return policy->governor->show_setspeed(policy, buf); |
| 712 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | |
Thomas Renninger | e2f74f3 | 2009-11-19 12:31:01 +0100 | [diff] [blame] | 714 | /** |
viresh kumar | 8bf1ac72 | 2012-10-23 01:23:33 +0200 | [diff] [blame] | 715 | * show_bios_limit - show the current cpufreq HW/BIOS limitation |
Thomas Renninger | e2f74f3 | 2009-11-19 12:31:01 +0100 | [diff] [blame] | 716 | */ |
| 717 | static ssize_t show_bios_limit(struct cpufreq_policy *policy, char *buf) |
| 718 | { |
| 719 | unsigned int limit; |
| 720 | int ret; |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 721 | if (cpufreq_driver->bios_limit) { |
| 722 | ret = cpufreq_driver->bios_limit(policy->cpu, &limit); |
Thomas Renninger | e2f74f3 | 2009-11-19 12:31:01 +0100 | [diff] [blame] | 723 | if (!ret) |
| 724 | return sprintf(buf, "%u\n", limit); |
| 725 | } |
| 726 | return sprintf(buf, "%u\n", policy->cpuinfo.max_freq); |
| 727 | } |
| 728 | |
Borislav Petkov | 6dad2a2 | 2010-03-31 21:56:46 +0200 | [diff] [blame] | 729 | cpufreq_freq_attr_ro_perm(cpuinfo_cur_freq, 0400); |
| 730 | cpufreq_freq_attr_ro(cpuinfo_min_freq); |
| 731 | cpufreq_freq_attr_ro(cpuinfo_max_freq); |
| 732 | cpufreq_freq_attr_ro(cpuinfo_transition_latency); |
| 733 | cpufreq_freq_attr_ro(scaling_available_governors); |
| 734 | cpufreq_freq_attr_ro(scaling_driver); |
| 735 | cpufreq_freq_attr_ro(scaling_cur_freq); |
| 736 | cpufreq_freq_attr_ro(bios_limit); |
| 737 | cpufreq_freq_attr_ro(related_cpus); |
| 738 | cpufreq_freq_attr_ro(affected_cpus); |
| 739 | cpufreq_freq_attr_rw(scaling_min_freq); |
| 740 | cpufreq_freq_attr_rw(scaling_max_freq); |
| 741 | cpufreq_freq_attr_rw(scaling_governor); |
| 742 | cpufreq_freq_attr_rw(scaling_setspeed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 744 | static struct attribute *default_attrs[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | &cpuinfo_min_freq.attr, |
| 746 | &cpuinfo_max_freq.attr, |
Thomas Renninger | ed12978 | 2009-02-04 01:17:41 +0100 | [diff] [blame] | 747 | &cpuinfo_transition_latency.attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | &scaling_min_freq.attr, |
| 749 | &scaling_max_freq.attr, |
| 750 | &affected_cpus.attr, |
Darrick J. Wong | e8628dd | 2008-04-18 13:31:12 -0700 | [diff] [blame] | 751 | &related_cpus.attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | &scaling_governor.attr, |
| 753 | &scaling_driver.attr, |
| 754 | &scaling_available_governors.attr, |
Venki Pallipadi | 9e76988 | 2007-10-26 10:18:21 -0700 | [diff] [blame] | 755 | &scaling_setspeed.attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | NULL |
| 757 | }; |
| 758 | |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 759 | #define to_policy(k) container_of(k, struct cpufreq_policy, kobj) |
| 760 | #define to_attr(a) container_of(a, struct freq_attr, attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 762 | static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | { |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 764 | struct cpufreq_policy *policy = to_policy(kobj); |
| 765 | struct freq_attr *fattr = to_attr(attr); |
Viresh Kumar | 1b750e3 | 2013-10-02 14:13:09 +0530 | [diff] [blame] | 766 | ssize_t ret; |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 767 | |
| 768 | if (!down_read_trylock(&cpufreq_rwsem)) |
Viresh Kumar | 1b750e3 | 2013-10-02 14:13:09 +0530 | [diff] [blame] | 769 | return -EINVAL; |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 770 | |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 771 | down_read(&policy->rwsem); |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 772 | |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 773 | if (fattr->show) |
| 774 | ret = fattr->show(policy, buf); |
| 775 | else |
| 776 | ret = -EIO; |
| 777 | |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 778 | up_read(&policy->rwsem); |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 779 | up_read(&cpufreq_rwsem); |
Viresh Kumar | 1b750e3 | 2013-10-02 14:13:09 +0530 | [diff] [blame] | 780 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | return ret; |
| 782 | } |
| 783 | |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 784 | static ssize_t store(struct kobject *kobj, struct attribute *attr, |
| 785 | const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | { |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 787 | struct cpufreq_policy *policy = to_policy(kobj); |
| 788 | struct freq_attr *fattr = to_attr(attr); |
Dave Jones | a07530b | 2008-03-05 14:22:25 -0500 | [diff] [blame] | 789 | ssize_t ret = -EINVAL; |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 790 | |
Srivatsa S. Bhat | 4f750c9 | 2013-09-07 01:23:43 +0530 | [diff] [blame] | 791 | get_online_cpus(); |
| 792 | |
| 793 | if (!cpu_online(policy->cpu)) |
| 794 | goto unlock; |
| 795 | |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 796 | if (!down_read_trylock(&cpufreq_rwsem)) |
Srivatsa S. Bhat | 4f750c9 | 2013-09-07 01:23:43 +0530 | [diff] [blame] | 797 | goto unlock; |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 798 | |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 799 | down_write(&policy->rwsem); |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 800 | |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 801 | if (fattr->store) |
| 802 | ret = fattr->store(policy, buf, count); |
| 803 | else |
| 804 | ret = -EIO; |
| 805 | |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 806 | up_write(&policy->rwsem); |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 807 | |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 808 | up_read(&cpufreq_rwsem); |
Srivatsa S. Bhat | 4f750c9 | 2013-09-07 01:23:43 +0530 | [diff] [blame] | 809 | unlock: |
| 810 | put_online_cpus(); |
| 811 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | return ret; |
| 813 | } |
| 814 | |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 815 | static void cpufreq_sysfs_release(struct kobject *kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | { |
Dave Jones | 905d77c | 2008-03-05 14:28:32 -0500 | [diff] [blame] | 817 | struct cpufreq_policy *policy = to_policy(kobj); |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 818 | pr_debug("last reference is dropped\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | complete(&policy->kobj_unregister); |
| 820 | } |
| 821 | |
Emese Revfy | 52cf25d | 2010-01-19 02:58:23 +0100 | [diff] [blame] | 822 | static const struct sysfs_ops sysfs_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | .show = show, |
| 824 | .store = store, |
| 825 | }; |
| 826 | |
| 827 | static struct kobj_type ktype_cpufreq = { |
| 828 | .sysfs_ops = &sysfs_ops, |
| 829 | .default_attrs = default_attrs, |
| 830 | .release = cpufreq_sysfs_release, |
| 831 | }; |
| 832 | |
Viresh Kumar | 2361be2 | 2013-05-17 16:09:09 +0530 | [diff] [blame] | 833 | struct kobject *cpufreq_global_kobject; |
| 834 | EXPORT_SYMBOL(cpufreq_global_kobject); |
| 835 | |
| 836 | static int cpufreq_global_kobject_usage; |
| 837 | |
| 838 | int cpufreq_get_global_kobject(void) |
| 839 | { |
| 840 | if (!cpufreq_global_kobject_usage++) |
| 841 | return kobject_add(cpufreq_global_kobject, |
| 842 | &cpu_subsys.dev_root->kobj, "%s", "cpufreq"); |
| 843 | |
| 844 | return 0; |
| 845 | } |
| 846 | EXPORT_SYMBOL(cpufreq_get_global_kobject); |
| 847 | |
| 848 | void cpufreq_put_global_kobject(void) |
| 849 | { |
| 850 | if (!--cpufreq_global_kobject_usage) |
| 851 | kobject_del(cpufreq_global_kobject); |
| 852 | } |
| 853 | EXPORT_SYMBOL(cpufreq_put_global_kobject); |
| 854 | |
| 855 | int cpufreq_sysfs_create_file(const struct attribute *attr) |
| 856 | { |
| 857 | int ret = cpufreq_get_global_kobject(); |
| 858 | |
| 859 | if (!ret) { |
| 860 | ret = sysfs_create_file(cpufreq_global_kobject, attr); |
| 861 | if (ret) |
| 862 | cpufreq_put_global_kobject(); |
| 863 | } |
| 864 | |
| 865 | return ret; |
| 866 | } |
| 867 | EXPORT_SYMBOL(cpufreq_sysfs_create_file); |
| 868 | |
| 869 | void cpufreq_sysfs_remove_file(const struct attribute *attr) |
| 870 | { |
| 871 | sysfs_remove_file(cpufreq_global_kobject, attr); |
| 872 | cpufreq_put_global_kobject(); |
| 873 | } |
| 874 | EXPORT_SYMBOL(cpufreq_sysfs_remove_file); |
| 875 | |
Dave Jones | 19d6f7e | 2009-07-08 17:35:39 -0400 | [diff] [blame] | 876 | /* symlink affected CPUs */ |
Viresh Kumar | 308b60e | 2013-07-31 14:35:14 +0200 | [diff] [blame] | 877 | static int cpufreq_add_dev_symlink(struct cpufreq_policy *policy) |
Dave Jones | 19d6f7e | 2009-07-08 17:35:39 -0400 | [diff] [blame] | 878 | { |
| 879 | unsigned int j; |
| 880 | int ret = 0; |
| 881 | |
| 882 | for_each_cpu(j, policy->cpus) { |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 883 | struct device *cpu_dev; |
Dave Jones | 19d6f7e | 2009-07-08 17:35:39 -0400 | [diff] [blame] | 884 | |
Viresh Kumar | 308b60e | 2013-07-31 14:35:14 +0200 | [diff] [blame] | 885 | if (j == policy->cpu) |
Dave Jones | 19d6f7e | 2009-07-08 17:35:39 -0400 | [diff] [blame] | 886 | continue; |
Dave Jones | 19d6f7e | 2009-07-08 17:35:39 -0400 | [diff] [blame] | 887 | |
Viresh Kumar | e8fdde1 | 2013-07-31 14:31:33 +0200 | [diff] [blame] | 888 | pr_debug("Adding link for CPU: %u\n", j); |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 889 | cpu_dev = get_cpu_device(j); |
| 890 | ret = sysfs_create_link(&cpu_dev->kobj, &policy->kobj, |
Dave Jones | 19d6f7e | 2009-07-08 17:35:39 -0400 | [diff] [blame] | 891 | "cpufreq"); |
Rafael J. Wysocki | 71c3461 | 2013-08-04 01:19:34 +0200 | [diff] [blame] | 892 | if (ret) |
| 893 | break; |
Dave Jones | 19d6f7e | 2009-07-08 17:35:39 -0400 | [diff] [blame] | 894 | } |
| 895 | return ret; |
| 896 | } |
| 897 | |
Viresh Kumar | 308b60e | 2013-07-31 14:35:14 +0200 | [diff] [blame] | 898 | static int cpufreq_add_dev_interface(struct cpufreq_policy *policy, |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 899 | struct device *dev) |
Dave Jones | 909a694 | 2009-07-08 18:05:42 -0400 | [diff] [blame] | 900 | { |
| 901 | struct freq_attr **drv_attr; |
Dave Jones | 909a694 | 2009-07-08 18:05:42 -0400 | [diff] [blame] | 902 | int ret = 0; |
Dave Jones | 909a694 | 2009-07-08 18:05:42 -0400 | [diff] [blame] | 903 | |
Dave Jones | 909a694 | 2009-07-08 18:05:42 -0400 | [diff] [blame] | 904 | /* set up files for this cpu device */ |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 905 | drv_attr = cpufreq_driver->attr; |
Dave Jones | 909a694 | 2009-07-08 18:05:42 -0400 | [diff] [blame] | 906 | while ((drv_attr) && (*drv_attr)) { |
| 907 | ret = sysfs_create_file(&policy->kobj, &((*drv_attr)->attr)); |
| 908 | if (ret) |
Tomeu Vizoso | 6d4e81e | 2014-11-24 10:08:03 +0100 | [diff] [blame] | 909 | return ret; |
Dave Jones | 909a694 | 2009-07-08 18:05:42 -0400 | [diff] [blame] | 910 | drv_attr++; |
| 911 | } |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 912 | if (cpufreq_driver->get) { |
Dave Jones | 909a694 | 2009-07-08 18:05:42 -0400 | [diff] [blame] | 913 | ret = sysfs_create_file(&policy->kobj, &cpuinfo_cur_freq.attr); |
| 914 | if (ret) |
Tomeu Vizoso | 6d4e81e | 2014-11-24 10:08:03 +0100 | [diff] [blame] | 915 | return ret; |
Dave Jones | 909a694 | 2009-07-08 18:05:42 -0400 | [diff] [blame] | 916 | } |
Dirk Brandewie | c034b02 | 2014-10-13 08:37:40 -0700 | [diff] [blame] | 917 | |
| 918 | ret = sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr); |
| 919 | if (ret) |
Tomeu Vizoso | 6d4e81e | 2014-11-24 10:08:03 +0100 | [diff] [blame] | 920 | return ret; |
Dirk Brandewie | c034b02 | 2014-10-13 08:37:40 -0700 | [diff] [blame] | 921 | |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 922 | if (cpufreq_driver->bios_limit) { |
Thomas Renninger | e2f74f3 | 2009-11-19 12:31:01 +0100 | [diff] [blame] | 923 | ret = sysfs_create_file(&policy->kobj, &bios_limit.attr); |
| 924 | if (ret) |
Tomeu Vizoso | 6d4e81e | 2014-11-24 10:08:03 +0100 | [diff] [blame] | 925 | return ret; |
Thomas Renninger | e2f74f3 | 2009-11-19 12:31:01 +0100 | [diff] [blame] | 926 | } |
Dave Jones | 909a694 | 2009-07-08 18:05:42 -0400 | [diff] [blame] | 927 | |
Tomeu Vizoso | 6d4e81e | 2014-11-24 10:08:03 +0100 | [diff] [blame] | 928 | return cpufreq_add_dev_symlink(policy); |
Srivatsa S. Bhat | e18f168 | 2013-07-30 04:24:23 +0530 | [diff] [blame] | 929 | } |
| 930 | |
| 931 | static void cpufreq_init_policy(struct cpufreq_policy *policy) |
| 932 | { |
viresh kumar | 6e2c89d | 2014-03-04 11:43:59 +0800 | [diff] [blame] | 933 | struct cpufreq_governor *gov = NULL; |
Srivatsa S. Bhat | e18f168 | 2013-07-30 04:24:23 +0530 | [diff] [blame] | 934 | struct cpufreq_policy new_policy; |
| 935 | int ret = 0; |
| 936 | |
Viresh Kumar | d5b73cd | 2013-08-06 22:53:06 +0530 | [diff] [blame] | 937 | memcpy(&new_policy, policy, sizeof(*policy)); |
Jason Baron | a27a9ab | 2013-12-19 22:50:50 +0000 | [diff] [blame] | 938 | |
viresh kumar | 6e2c89d | 2014-03-04 11:43:59 +0800 | [diff] [blame] | 939 | /* Update governor of new_policy to the governor used before hotplug */ |
| 940 | gov = __find_governor(per_cpu(cpufreq_cpu_governor, policy->cpu)); |
| 941 | if (gov) |
| 942 | pr_debug("Restoring governor %s for cpu %d\n", |
| 943 | policy->governor->name, policy->cpu); |
| 944 | else |
| 945 | gov = CPUFREQ_DEFAULT_GOVERNOR; |
| 946 | |
| 947 | new_policy.governor = gov; |
| 948 | |
Jason Baron | a27a9ab | 2013-12-19 22:50:50 +0000 | [diff] [blame] | 949 | /* Use the default policy if its valid. */ |
| 950 | if (cpufreq_driver->setpolicy) |
viresh kumar | 6e2c89d | 2014-03-04 11:43:59 +0800 | [diff] [blame] | 951 | cpufreq_parse_governor(gov->name, &new_policy.policy, NULL); |
Dave Jones | ecf7e46 | 2009-07-08 18:48:47 -0400 | [diff] [blame] | 952 | |
| 953 | /* set default policy */ |
Viresh Kumar | 037ce83 | 2013-10-02 14:13:16 +0530 | [diff] [blame] | 954 | ret = cpufreq_set_policy(policy, &new_policy); |
Dave Jones | ecf7e46 | 2009-07-08 18:48:47 -0400 | [diff] [blame] | 955 | if (ret) { |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 956 | pr_debug("setting policy failed\n"); |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 957 | if (cpufreq_driver->exit) |
| 958 | cpufreq_driver->exit(policy); |
Dave Jones | ecf7e46 | 2009-07-08 18:48:47 -0400 | [diff] [blame] | 959 | } |
Dave Jones | 909a694 | 2009-07-08 18:05:42 -0400 | [diff] [blame] | 960 | } |
| 961 | |
Viresh Kumar | fcf8058 | 2013-01-29 14:39:08 +0000 | [diff] [blame] | 962 | #ifdef CONFIG_HOTPLUG_CPU |
Viresh Kumar | d8d3b47 | 2013-08-04 01:20:07 +0200 | [diff] [blame] | 963 | static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, |
Viresh Kumar | 42f921a | 2013-12-20 21:26:02 +0530 | [diff] [blame] | 964 | unsigned int cpu, struct device *dev) |
Viresh Kumar | fcf8058 | 2013-01-29 14:39:08 +0000 | [diff] [blame] | 965 | { |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 966 | int ret = 0; |
Viresh Kumar | fcf8058 | 2013-01-29 14:39:08 +0000 | [diff] [blame] | 967 | unsigned long flags; |
| 968 | |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 969 | if (has_target()) { |
Viresh Kumar | 3de9bde | 2013-08-06 22:53:13 +0530 | [diff] [blame] | 970 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP); |
| 971 | if (ret) { |
| 972 | pr_err("%s: Failed to stop governor\n", __func__); |
| 973 | return ret; |
| 974 | } |
| 975 | } |
Viresh Kumar | fcf8058 | 2013-01-29 14:39:08 +0000 | [diff] [blame] | 976 | |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 977 | down_write(&policy->rwsem); |
Viresh Kumar | 2eaa3e2 | 2013-02-07 10:55:00 +0530 | [diff] [blame] | 978 | |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 979 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
Viresh Kumar | 2eaa3e2 | 2013-02-07 10:55:00 +0530 | [diff] [blame] | 980 | |
Viresh Kumar | fcf8058 | 2013-01-29 14:39:08 +0000 | [diff] [blame] | 981 | cpumask_set_cpu(cpu, policy->cpus); |
| 982 | per_cpu(cpufreq_cpu_data, cpu) = policy; |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 983 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
Viresh Kumar | fcf8058 | 2013-01-29 14:39:08 +0000 | [diff] [blame] | 984 | |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 985 | up_write(&policy->rwsem); |
Viresh Kumar | 2eaa3e2 | 2013-02-07 10:55:00 +0530 | [diff] [blame] | 986 | |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 987 | if (has_target()) { |
Stratos Karafotis | e5c87b7 | 2014-03-19 23:29:17 +0200 | [diff] [blame] | 988 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_START); |
| 989 | if (!ret) |
| 990 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); |
| 991 | |
| 992 | if (ret) { |
Viresh Kumar | 3de9bde | 2013-08-06 22:53:13 +0530 | [diff] [blame] | 993 | pr_err("%s: Failed to start governor\n", __func__); |
| 994 | return ret; |
| 995 | } |
Viresh Kumar | 820c6ca | 2013-04-22 00:48:03 +0200 | [diff] [blame] | 996 | } |
Viresh Kumar | fcf8058 | 2013-01-29 14:39:08 +0000 | [diff] [blame] | 997 | |
Viresh Kumar | 42f921a | 2013-12-20 21:26:02 +0530 | [diff] [blame] | 998 | return sysfs_create_link(&dev->kobj, &policy->kobj, "cpufreq"); |
Viresh Kumar | fcf8058 | 2013-01-29 14:39:08 +0000 | [diff] [blame] | 999 | } |
| 1000 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | |
Srivatsa S. Bhat | 8414809 | 2013-07-30 04:25:10 +0530 | [diff] [blame] | 1002 | static struct cpufreq_policy *cpufreq_policy_restore(unsigned int cpu) |
| 1003 | { |
| 1004 | struct cpufreq_policy *policy; |
| 1005 | unsigned long flags; |
| 1006 | |
Lan Tianyu | 44871c9 | 2013-09-11 15:05:05 +0800 | [diff] [blame] | 1007 | read_lock_irqsave(&cpufreq_driver_lock, flags); |
Srivatsa S. Bhat | 8414809 | 2013-07-30 04:25:10 +0530 | [diff] [blame] | 1008 | |
| 1009 | policy = per_cpu(cpufreq_cpu_data_fallback, cpu); |
| 1010 | |
Lan Tianyu | 44871c9 | 2013-09-11 15:05:05 +0800 | [diff] [blame] | 1011 | read_unlock_irqrestore(&cpufreq_driver_lock, flags); |
Srivatsa S. Bhat | 8414809 | 2013-07-30 04:25:10 +0530 | [diff] [blame] | 1012 | |
Geert Uytterhoeven | 09712f5 | 2014-11-04 17:05:25 +0100 | [diff] [blame] | 1013 | if (policy) |
| 1014 | policy->governor = NULL; |
viresh kumar | 6e2c89d | 2014-03-04 11:43:59 +0800 | [diff] [blame] | 1015 | |
Srivatsa S. Bhat | 8414809 | 2013-07-30 04:25:10 +0530 | [diff] [blame] | 1016 | return policy; |
| 1017 | } |
| 1018 | |
Srivatsa S. Bhat | e9698cc | 2013-07-30 04:24:11 +0530 | [diff] [blame] | 1019 | static struct cpufreq_policy *cpufreq_policy_alloc(void) |
| 1020 | { |
| 1021 | struct cpufreq_policy *policy; |
| 1022 | |
| 1023 | policy = kzalloc(sizeof(*policy), GFP_KERNEL); |
| 1024 | if (!policy) |
| 1025 | return NULL; |
| 1026 | |
| 1027 | if (!alloc_cpumask_var(&policy->cpus, GFP_KERNEL)) |
| 1028 | goto err_free_policy; |
| 1029 | |
| 1030 | if (!zalloc_cpumask_var(&policy->related_cpus, GFP_KERNEL)) |
| 1031 | goto err_free_cpumask; |
| 1032 | |
Lukasz Majewski | c88a1f8 | 2013-08-06 22:53:08 +0530 | [diff] [blame] | 1033 | INIT_LIST_HEAD(&policy->policy_list); |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 1034 | init_rwsem(&policy->rwsem); |
Srivatsa S. Bhat | 12478cf | 2014-03-24 13:35:44 +0530 | [diff] [blame] | 1035 | spin_lock_init(&policy->transition_lock); |
| 1036 | init_waitqueue_head(&policy->transition_wait); |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 1037 | |
Srivatsa S. Bhat | e9698cc | 2013-07-30 04:24:11 +0530 | [diff] [blame] | 1038 | return policy; |
| 1039 | |
| 1040 | err_free_cpumask: |
| 1041 | free_cpumask_var(policy->cpus); |
| 1042 | err_free_policy: |
| 1043 | kfree(policy); |
| 1044 | |
| 1045 | return NULL; |
| 1046 | } |
| 1047 | |
Viresh Kumar | 42f921a | 2013-12-20 21:26:02 +0530 | [diff] [blame] | 1048 | static void cpufreq_policy_put_kobj(struct cpufreq_policy *policy) |
| 1049 | { |
| 1050 | struct kobject *kobj; |
| 1051 | struct completion *cmp; |
| 1052 | |
Viresh Kumar | fcd7af9 | 2014-01-07 07:10:10 +0530 | [diff] [blame] | 1053 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
| 1054 | CPUFREQ_REMOVE_POLICY, policy); |
| 1055 | |
Viresh Kumar | 42f921a | 2013-12-20 21:26:02 +0530 | [diff] [blame] | 1056 | down_read(&policy->rwsem); |
| 1057 | kobj = &policy->kobj; |
| 1058 | cmp = &policy->kobj_unregister; |
| 1059 | up_read(&policy->rwsem); |
| 1060 | kobject_put(kobj); |
| 1061 | |
| 1062 | /* |
| 1063 | * We need to make sure that the underlying kobj is |
| 1064 | * actually not referenced anymore by anybody before we |
| 1065 | * proceed with unloading. |
| 1066 | */ |
| 1067 | pr_debug("waiting for dropping of refcount\n"); |
| 1068 | wait_for_completion(cmp); |
| 1069 | pr_debug("wait complete\n"); |
| 1070 | } |
| 1071 | |
Srivatsa S. Bhat | e9698cc | 2013-07-30 04:24:11 +0530 | [diff] [blame] | 1072 | static void cpufreq_policy_free(struct cpufreq_policy *policy) |
| 1073 | { |
| 1074 | free_cpumask_var(policy->related_cpus); |
| 1075 | free_cpumask_var(policy->cpus); |
| 1076 | kfree(policy); |
| 1077 | } |
| 1078 | |
Viresh Kumar | 1bfb425 | 2014-07-17 10:48:28 +0530 | [diff] [blame] | 1079 | static int update_policy_cpu(struct cpufreq_policy *policy, unsigned int cpu, |
| 1080 | struct device *cpu_dev) |
Srivatsa S. Bhat | 0d66b91 | 2013-09-12 01:42:59 +0530 | [diff] [blame] | 1081 | { |
Viresh Kumar | 1bfb425 | 2014-07-17 10:48:28 +0530 | [diff] [blame] | 1082 | int ret; |
| 1083 | |
Srivatsa S. Bhat | 99ec899 | 2013-09-12 17:29:09 +0530 | [diff] [blame] | 1084 | if (WARN_ON(cpu == policy->cpu)) |
Viresh Kumar | 1bfb425 | 2014-07-17 10:48:28 +0530 | [diff] [blame] | 1085 | return 0; |
| 1086 | |
| 1087 | /* Move kobject to the new policy->cpu */ |
| 1088 | ret = kobject_move(&policy->kobj, &cpu_dev->kobj); |
| 1089 | if (ret) { |
| 1090 | pr_err("%s: Failed to move kobj: %d\n", __func__, ret); |
| 1091 | return ret; |
| 1092 | } |
Srivatsa S. Bhat | cb38ed5 | 2013-09-12 01:43:42 +0530 | [diff] [blame] | 1093 | |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 1094 | down_write(&policy->rwsem); |
Viresh Kumar | 8efd576 | 2013-09-17 10:22:11 +0530 | [diff] [blame] | 1095 | |
Srivatsa S. Bhat | 0d66b91 | 2013-09-12 01:42:59 +0530 | [diff] [blame] | 1096 | policy->last_cpu = policy->cpu; |
| 1097 | policy->cpu = cpu; |
| 1098 | |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 1099 | up_write(&policy->rwsem); |
Viresh Kumar | 8efd576 | 2013-09-17 10:22:11 +0530 | [diff] [blame] | 1100 | |
Srivatsa S. Bhat | 0d66b91 | 2013-09-12 01:42:59 +0530 | [diff] [blame] | 1101 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
| 1102 | CPUFREQ_UPDATE_POLICY_CPU, policy); |
Viresh Kumar | 1bfb425 | 2014-07-17 10:48:28 +0530 | [diff] [blame] | 1103 | |
| 1104 | return 0; |
Srivatsa S. Bhat | 0d66b91 | 2013-09-12 01:42:59 +0530 | [diff] [blame] | 1105 | } |
| 1106 | |
Viresh Kumar | 96bbbe4 | 2014-03-10 14:53:35 +0530 | [diff] [blame] | 1107 | static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | { |
Viresh Kumar | fcf8058 | 2013-01-29 14:39:08 +0000 | [diff] [blame] | 1109 | unsigned int j, cpu = dev->id; |
Viresh Kumar | 6592246 | 2013-02-07 10:56:03 +0530 | [diff] [blame] | 1110 | int ret = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | struct cpufreq_policy *policy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | unsigned long flags; |
Viresh Kumar | 96bbbe4 | 2014-03-10 14:53:35 +0530 | [diff] [blame] | 1113 | bool recover_policy = cpufreq_suspended; |
Prarit Bhargava | 90e41ba | 2009-11-12 09:18:46 -0500 | [diff] [blame] | 1114 | #ifdef CONFIG_HOTPLUG_CPU |
Viresh Kumar | 1b27429 | 2013-08-20 12:08:26 +0530 | [diff] [blame] | 1115 | struct cpufreq_policy *tpolicy; |
Prarit Bhargava | 90e41ba | 2009-11-12 09:18:46 -0500 | [diff] [blame] | 1116 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | |
Ashok Raj | c32b6b8 | 2005-10-30 14:59:54 -0800 | [diff] [blame] | 1118 | if (cpu_is_offline(cpu)) |
| 1119 | return 0; |
| 1120 | |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 1121 | pr_debug("adding CPU %u\n", cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | |
| 1123 | #ifdef CONFIG_SMP |
| 1124 | /* check whether a different CPU already registered this |
| 1125 | * CPU because it is in the same boat. */ |
| 1126 | policy = cpufreq_cpu_get(cpu); |
| 1127 | if (unlikely(policy)) { |
Dave Jones | 8ff6973 | 2006-03-05 03:37:23 -0500 | [diff] [blame] | 1128 | cpufreq_cpu_put(policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | return 0; |
| 1130 | } |
Li Zhong | 5025d62 | 2013-08-21 01:31:08 +0200 | [diff] [blame] | 1131 | #endif |
Viresh Kumar | fcf8058 | 2013-01-29 14:39:08 +0000 | [diff] [blame] | 1132 | |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 1133 | if (!down_read_trylock(&cpufreq_rwsem)) |
| 1134 | return 0; |
| 1135 | |
Viresh Kumar | fcf8058 | 2013-01-29 14:39:08 +0000 | [diff] [blame] | 1136 | #ifdef CONFIG_HOTPLUG_CPU |
| 1137 | /* Check if this cpu was hot-unplugged earlier and has siblings */ |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 1138 | read_lock_irqsave(&cpufreq_driver_lock, flags); |
Viresh Kumar | 1b27429 | 2013-08-20 12:08:26 +0530 | [diff] [blame] | 1139 | list_for_each_entry(tpolicy, &cpufreq_policy_list, policy_list) { |
| 1140 | if (cpumask_test_cpu(cpu, tpolicy->related_cpus)) { |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 1141 | read_unlock_irqrestore(&cpufreq_driver_lock, flags); |
Viresh Kumar | 42f921a | 2013-12-20 21:26:02 +0530 | [diff] [blame] | 1142 | ret = cpufreq_add_policy_cpu(tpolicy, cpu, dev); |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 1143 | up_read(&cpufreq_rwsem); |
| 1144 | return ret; |
Viresh Kumar | 2eaa3e2 | 2013-02-07 10:55:00 +0530 | [diff] [blame] | 1145 | } |
Viresh Kumar | fcf8058 | 2013-01-29 14:39:08 +0000 | [diff] [blame] | 1146 | } |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 1147 | read_unlock_irqrestore(&cpufreq_driver_lock, flags); |
Viresh Kumar | fcf8058 | 2013-01-29 14:39:08 +0000 | [diff] [blame] | 1148 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | |
Rafael J. Wysocki | 72368d1 | 2013-12-27 01:07:11 +0100 | [diff] [blame] | 1150 | /* |
| 1151 | * Restore the saved policy when doing light-weight init and fall back |
| 1152 | * to the full init if that fails. |
| 1153 | */ |
Viresh Kumar | 96bbbe4 | 2014-03-10 14:53:35 +0530 | [diff] [blame] | 1154 | policy = recover_policy ? cpufreq_policy_restore(cpu) : NULL; |
Rafael J. Wysocki | 72368d1 | 2013-12-27 01:07:11 +0100 | [diff] [blame] | 1155 | if (!policy) { |
Viresh Kumar | 96bbbe4 | 2014-03-10 14:53:35 +0530 | [diff] [blame] | 1156 | recover_policy = false; |
Srivatsa S. Bhat | 8414809 | 2013-07-30 04:25:10 +0530 | [diff] [blame] | 1157 | policy = cpufreq_policy_alloc(); |
Rafael J. Wysocki | 72368d1 | 2013-12-27 01:07:11 +0100 | [diff] [blame] | 1158 | if (!policy) |
| 1159 | goto nomem_out; |
| 1160 | } |
Srivatsa S. Bhat | 0d66b91 | 2013-09-12 01:42:59 +0530 | [diff] [blame] | 1161 | |
| 1162 | /* |
| 1163 | * In the resume path, since we restore a saved policy, the assignment |
| 1164 | * to policy->cpu is like an update of the existing policy, rather than |
| 1165 | * the creation of a brand new one. So we need to perform this update |
| 1166 | * by invoking update_policy_cpu(). |
| 1167 | */ |
Viresh Kumar | 1bfb425 | 2014-07-17 10:48:28 +0530 | [diff] [blame] | 1168 | if (recover_policy && cpu != policy->cpu) |
| 1169 | WARN_ON(update_policy_cpu(policy, cpu, dev)); |
| 1170 | else |
Srivatsa S. Bhat | 0d66b91 | 2013-09-12 01:42:59 +0530 | [diff] [blame] | 1171 | policy->cpu = cpu; |
| 1172 | |
Rusty Russell | 835481d | 2009-01-04 05:18:06 -0800 | [diff] [blame] | 1173 | cpumask_copy(policy->cpus, cpumask_of(cpu)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | init_completion(&policy->kobj_unregister); |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 1176 | INIT_WORK(&policy->update, handle_update); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | |
| 1178 | /* call driver. From then on the cpufreq must be able |
| 1179 | * to accept all calls to ->verify and ->setpolicy for this CPU |
| 1180 | */ |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 1181 | ret = cpufreq_driver->init(policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | if (ret) { |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 1183 | pr_debug("initialization failed\n"); |
Viresh Kumar | 2eaa3e2 | 2013-02-07 10:55:00 +0530 | [diff] [blame] | 1184 | goto err_set_policy_cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | } |
Viresh Kumar | 643ae6e | 2013-01-12 05:14:38 +0000 | [diff] [blame] | 1186 | |
Tomeu Vizoso | 6d4e81e | 2014-11-24 10:08:03 +0100 | [diff] [blame] | 1187 | down_write(&policy->rwsem); |
| 1188 | |
Viresh Kumar | 5a7e56a | 2014-03-04 11:44:00 +0800 | [diff] [blame] | 1189 | /* related cpus should atleast have policy->cpus */ |
| 1190 | cpumask_or(policy->related_cpus, policy->related_cpus, policy->cpus); |
| 1191 | |
| 1192 | /* |
| 1193 | * affected cpus must always be the one, which are online. We aren't |
| 1194 | * managing offline cpus here. |
| 1195 | */ |
| 1196 | cpumask_and(policy->cpus, policy->cpus, cpu_online_mask); |
| 1197 | |
Viresh Kumar | 96bbbe4 | 2014-03-10 14:53:35 +0530 | [diff] [blame] | 1198 | if (!recover_policy) { |
Viresh Kumar | 5a7e56a | 2014-03-04 11:44:00 +0800 | [diff] [blame] | 1199 | policy->user_policy.min = policy->min; |
| 1200 | policy->user_policy.max = policy->max; |
Tomeu Vizoso | 6d4e81e | 2014-11-24 10:08:03 +0100 | [diff] [blame] | 1201 | |
| 1202 | /* prepare interface data */ |
| 1203 | ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq, |
| 1204 | &dev->kobj, "cpufreq"); |
| 1205 | if (ret) { |
| 1206 | pr_err("%s: failed to init policy->kobj: %d\n", |
| 1207 | __func__, ret); |
| 1208 | goto err_init_policy_kobj; |
| 1209 | } |
Viresh Kumar | 5a7e56a | 2014-03-04 11:44:00 +0800 | [diff] [blame] | 1210 | } |
| 1211 | |
Viresh Kumar | 652ed95 | 2014-01-09 20:38:43 +0530 | [diff] [blame] | 1212 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
| 1213 | for_each_cpu(j, policy->cpus) |
| 1214 | per_cpu(cpufreq_cpu_data, j) = policy; |
| 1215 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
| 1216 | |
Rafael J. Wysocki | 2ed99e3 | 2014-03-12 21:49:33 +0100 | [diff] [blame] | 1217 | if (cpufreq_driver->get && !cpufreq_driver->setpolicy) { |
Viresh Kumar | da60ce9 | 2013-10-03 20:28:30 +0530 | [diff] [blame] | 1218 | policy->cur = cpufreq_driver->get(policy->cpu); |
| 1219 | if (!policy->cur) { |
| 1220 | pr_err("%s: ->get() failed\n", __func__); |
| 1221 | goto err_get_freq; |
| 1222 | } |
| 1223 | } |
| 1224 | |
Viresh Kumar | d391669 | 2013-12-03 11:20:46 +0530 | [diff] [blame] | 1225 | /* |
| 1226 | * Sometimes boot loaders set CPU frequency to a value outside of |
| 1227 | * frequency table present with cpufreq core. In such cases CPU might be |
| 1228 | * unstable if it has to run on that frequency for long duration of time |
| 1229 | * and so its better to set it to a frequency which is specified in |
| 1230 | * freq-table. This also makes cpufreq stats inconsistent as |
| 1231 | * cpufreq-stats would fail to register because current frequency of CPU |
| 1232 | * isn't found in freq-table. |
| 1233 | * |
| 1234 | * Because we don't want this change to effect boot process badly, we go |
| 1235 | * for the next freq which is >= policy->cur ('cur' must be set by now, |
| 1236 | * otherwise we will end up setting freq to lowest of the table as 'cur' |
| 1237 | * is initialized to zero). |
| 1238 | * |
| 1239 | * We are passing target-freq as "policy->cur - 1" otherwise |
| 1240 | * __cpufreq_driver_target() would simply fail, as policy->cur will be |
| 1241 | * equal to target-freq. |
| 1242 | */ |
| 1243 | if ((cpufreq_driver->flags & CPUFREQ_NEED_INITIAL_FREQ_CHECK) |
| 1244 | && has_target()) { |
| 1245 | /* Are we running at unknown frequency ? */ |
| 1246 | ret = cpufreq_frequency_table_get_index(policy, policy->cur); |
| 1247 | if (ret == -EINVAL) { |
| 1248 | /* Warn user and fix it */ |
| 1249 | pr_warn("%s: CPU%d: Running at unlisted freq: %u KHz\n", |
| 1250 | __func__, policy->cpu, policy->cur); |
| 1251 | ret = __cpufreq_driver_target(policy, policy->cur - 1, |
| 1252 | CPUFREQ_RELATION_L); |
| 1253 | |
| 1254 | /* |
| 1255 | * Reaching here after boot in a few seconds may not |
| 1256 | * mean that system will remain stable at "unknown" |
| 1257 | * frequency for longer duration. Hence, a BUG_ON(). |
| 1258 | */ |
| 1259 | BUG_ON(ret); |
| 1260 | pr_warn("%s: CPU%d: Unlisted initial frequency changed to: %u KHz\n", |
| 1261 | __func__, policy->cpu, policy->cur); |
| 1262 | } |
| 1263 | } |
| 1264 | |
Thomas Renninger | a1531ac | 2008-07-29 22:32:58 -0700 | [diff] [blame] | 1265 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
| 1266 | CPUFREQ_START, policy); |
| 1267 | |
Viresh Kumar | 96bbbe4 | 2014-03-10 14:53:35 +0530 | [diff] [blame] | 1268 | if (!recover_policy) { |
Viresh Kumar | 308b60e | 2013-07-31 14:35:14 +0200 | [diff] [blame] | 1269 | ret = cpufreq_add_dev_interface(policy, dev); |
Srivatsa S. Bhat | a82fab2 | 2013-07-30 04:24:49 +0530 | [diff] [blame] | 1270 | if (ret) |
| 1271 | goto err_out_unregister; |
Viresh Kumar | fcd7af9 | 2014-01-07 07:10:10 +0530 | [diff] [blame] | 1272 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
| 1273 | CPUFREQ_CREATE_POLICY, policy); |
Srivatsa S. Bhat | a82fab2 | 2013-07-30 04:24:49 +0530 | [diff] [blame] | 1274 | } |
Dave Jones | 8ff6973 | 2006-03-05 03:37:23 -0500 | [diff] [blame] | 1275 | |
Viresh Kumar | 9515f4d | 2013-08-20 12:08:23 +0530 | [diff] [blame] | 1276 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
| 1277 | list_add(&policy->policy_list, &cpufreq_policy_list); |
| 1278 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
| 1279 | |
Srivatsa S. Bhat | e18f168 | 2013-07-30 04:24:23 +0530 | [diff] [blame] | 1280 | cpufreq_init_policy(policy); |
| 1281 | |
Viresh Kumar | 96bbbe4 | 2014-03-10 14:53:35 +0530 | [diff] [blame] | 1282 | if (!recover_policy) { |
Viresh Kumar | 08fd8c1c | 2013-12-24 07:11:01 +0530 | [diff] [blame] | 1283 | policy->user_policy.policy = policy->policy; |
| 1284 | policy->user_policy.governor = policy->governor; |
| 1285 | } |
Viresh Kumar | 4e97b63 | 2014-03-04 11:44:01 +0800 | [diff] [blame] | 1286 | up_write(&policy->rwsem); |
Viresh Kumar | 08fd8c1c | 2013-12-24 07:11:01 +0530 | [diff] [blame] | 1287 | |
Greg Kroah-Hartman | 038c5b3 | 2007-12-17 15:54:39 -0400 | [diff] [blame] | 1288 | kobject_uevent(&policy->kobj, KOBJ_ADD); |
Viresh Kumar | 7c45cf3 | 2014-11-27 06:07:51 +0530 | [diff] [blame] | 1289 | |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 1290 | up_read(&cpufreq_rwsem); |
| 1291 | |
Viresh Kumar | 7c45cf3 | 2014-11-27 06:07:51 +0530 | [diff] [blame] | 1292 | /* Callback for handling stuff after policy is ready */ |
| 1293 | if (cpufreq_driver->ready) |
| 1294 | cpufreq_driver->ready(policy); |
| 1295 | |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 1296 | pr_debug("initialization complete\n"); |
Dave Jones | 87c3227 | 2006-03-29 01:48:37 -0500 | [diff] [blame] | 1297 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | return 0; |
| 1299 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | err_out_unregister: |
Viresh Kumar | 652ed95 | 2014-01-09 20:38:43 +0530 | [diff] [blame] | 1301 | err_get_freq: |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 1302 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
Viresh Kumar | 474deff | 2013-08-20 12:08:25 +0530 | [diff] [blame] | 1303 | for_each_cpu(j, policy->cpus) |
Mike Travis | 7a6aedf | 2008-03-25 15:06:53 -0700 | [diff] [blame] | 1304 | per_cpu(cpufreq_cpu_data, j) = NULL; |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 1305 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | |
Tomeu Vizoso | 6d4e81e | 2014-11-24 10:08:03 +0100 | [diff] [blame] | 1307 | if (!recover_policy) { |
| 1308 | kobject_put(&policy->kobj); |
| 1309 | wait_for_completion(&policy->kobj_unregister); |
| 1310 | } |
| 1311 | err_init_policy_kobj: |
Prarit Bhargava | 7106e02 | 2014-09-10 10:12:08 -0400 | [diff] [blame] | 1312 | up_write(&policy->rwsem); |
| 1313 | |
Viresh Kumar | da60ce9 | 2013-10-03 20:28:30 +0530 | [diff] [blame] | 1314 | if (cpufreq_driver->exit) |
| 1315 | cpufreq_driver->exit(policy); |
Viresh Kumar | 2eaa3e2 | 2013-02-07 10:55:00 +0530 | [diff] [blame] | 1316 | err_set_policy_cpu: |
Viresh Kumar | 96bbbe4 | 2014-03-10 14:53:35 +0530 | [diff] [blame] | 1317 | if (recover_policy) { |
Rafael J. Wysocki | 72368d1 | 2013-12-27 01:07:11 +0100 | [diff] [blame] | 1318 | /* Do not leave stale fallback data behind. */ |
| 1319 | per_cpu(cpufreq_cpu_data_fallback, cpu) = NULL; |
Viresh Kumar | 42f921a | 2013-12-20 21:26:02 +0530 | [diff] [blame] | 1320 | cpufreq_policy_put_kobj(policy); |
Rafael J. Wysocki | 72368d1 | 2013-12-27 01:07:11 +0100 | [diff] [blame] | 1321 | } |
Srivatsa S. Bhat | e9698cc | 2013-07-30 04:24:11 +0530 | [diff] [blame] | 1322 | cpufreq_policy_free(policy); |
Viresh Kumar | 42f921a | 2013-12-20 21:26:02 +0530 | [diff] [blame] | 1323 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | nomem_out: |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 1325 | up_read(&cpufreq_rwsem); |
| 1326 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1327 | return ret; |
| 1328 | } |
| 1329 | |
Srivatsa S. Bhat | a82fab2 | 2013-07-30 04:24:49 +0530 | [diff] [blame] | 1330 | /** |
| 1331 | * cpufreq_add_dev - add a CPU device |
| 1332 | * |
| 1333 | * Adds the cpufreq interface for a CPU device. |
| 1334 | * |
| 1335 | * The Oracle says: try running cpufreq registration/unregistration concurrently |
| 1336 | * with with cpu hotplugging and all hell will break loose. Tried to clean this |
| 1337 | * mess up, but more thorough testing is needed. - Mathieu |
| 1338 | */ |
| 1339 | static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) |
| 1340 | { |
Viresh Kumar | 96bbbe4 | 2014-03-10 14:53:35 +0530 | [diff] [blame] | 1341 | return __cpufreq_add_dev(dev, sif); |
Srivatsa S. Bhat | a82fab2 | 2013-07-30 04:24:49 +0530 | [diff] [blame] | 1342 | } |
| 1343 | |
Srivatsa S. Bhat | cedb70a | 2013-09-07 01:23:09 +0530 | [diff] [blame] | 1344 | static int __cpufreq_remove_dev_prepare(struct device *dev, |
Viresh Kumar | 96bbbe4 | 2014-03-10 14:53:35 +0530 | [diff] [blame] | 1345 | struct subsys_interface *sif) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | { |
Srivatsa S. Bhat | f9ba680 | 2013-07-30 04:24:36 +0530 | [diff] [blame] | 1347 | unsigned int cpu = dev->id, cpus; |
Viresh Kumar | 1bfb425 | 2014-07-17 10:48:28 +0530 | [diff] [blame] | 1348 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | unsigned long flags; |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 1350 | struct cpufreq_policy *policy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | |
Viresh Kumar | b8eed8a | 2013-01-14 13:23:03 +0000 | [diff] [blame] | 1352 | pr_debug("%s: unregistering CPU %u\n", __func__, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 1354 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1355 | |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 1356 | policy = per_cpu(cpufreq_cpu_data, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1357 | |
Srivatsa S. Bhat | 8414809 | 2013-07-30 04:25:10 +0530 | [diff] [blame] | 1358 | /* Save the policy somewhere when doing a light-weight tear-down */ |
Viresh Kumar | 96bbbe4 | 2014-03-10 14:53:35 +0530 | [diff] [blame] | 1359 | if (cpufreq_suspended) |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 1360 | per_cpu(cpufreq_cpu_data_fallback, cpu) = policy; |
Srivatsa S. Bhat | 8414809 | 2013-07-30 04:25:10 +0530 | [diff] [blame] | 1361 | |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 1362 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 1364 | if (!policy) { |
Viresh Kumar | b8eed8a | 2013-01-14 13:23:03 +0000 | [diff] [blame] | 1365 | pr_debug("%s: No cpu_data found\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 1369 | if (has_target()) { |
Viresh Kumar | 3de9bde | 2013-08-06 22:53:13 +0530 | [diff] [blame] | 1370 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP); |
| 1371 | if (ret) { |
| 1372 | pr_err("%s: Failed to stop governor\n", __func__); |
| 1373 | return ret; |
| 1374 | } |
| 1375 | } |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 1376 | |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 1377 | if (!cpufreq_driver->setpolicy) |
Dirk Brandewie | fa69e33 | 2013-02-06 09:02:11 -0800 | [diff] [blame] | 1378 | strncpy(per_cpu(cpufreq_cpu_governor, cpu), |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 1379 | policy->governor->name, CPUFREQ_NAME_LEN); |
Jacob Shin | 27ecddc | 2011-04-27 13:32:11 -0500 | [diff] [blame] | 1380 | |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 1381 | down_read(&policy->rwsem); |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 1382 | cpus = cpumask_weight(policy->cpus); |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 1383 | up_read(&policy->rwsem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1384 | |
Srivatsa S. Bhat | 61173f2 | 2013-09-12 01:43:25 +0530 | [diff] [blame] | 1385 | if (cpu != policy->cpu) { |
viresh kumar | 6964d91 | 2014-02-17 14:52:11 +0530 | [diff] [blame] | 1386 | sysfs_remove_link(&dev->kobj, "cpufreq"); |
Viresh Kumar | 73bf0fc | 2013-02-05 22:21:14 +0100 | [diff] [blame] | 1387 | } else if (cpus > 1) { |
Viresh Kumar | 1bfb425 | 2014-07-17 10:48:28 +0530 | [diff] [blame] | 1388 | /* Nominate new CPU */ |
| 1389 | int new_cpu = cpumask_any_but(policy->cpus, cpu); |
| 1390 | struct device *cpu_dev = get_cpu_device(new_cpu); |
Srivatsa S. Bhat | a82fab2 | 2013-07-30 04:24:49 +0530 | [diff] [blame] | 1391 | |
Viresh Kumar | 1bfb425 | 2014-07-17 10:48:28 +0530 | [diff] [blame] | 1392 | sysfs_remove_link(&cpu_dev->kobj, "cpufreq"); |
| 1393 | ret = update_policy_cpu(policy, new_cpu, cpu_dev); |
| 1394 | if (ret) { |
| 1395 | if (sysfs_create_link(&cpu_dev->kobj, &policy->kobj, |
| 1396 | "cpufreq")) |
| 1397 | pr_err("%s: Failed to restore kobj link to cpu:%d\n", |
| 1398 | __func__, cpu_dev->id); |
| 1399 | return ret; |
Viresh Kumar | b8eed8a | 2013-01-14 13:23:03 +0000 | [diff] [blame] | 1400 | } |
Viresh Kumar | 1bfb425 | 2014-07-17 10:48:28 +0530 | [diff] [blame] | 1401 | |
| 1402 | if (!cpufreq_suspended) |
| 1403 | pr_debug("%s: policy Kobject moved to cpu: %d from: %d\n", |
| 1404 | __func__, new_cpu, cpu); |
Preeti U Murthy | 789ca24 | 2014-09-29 15:47:12 +0200 | [diff] [blame] | 1405 | } else if (cpufreq_driver->stop_cpu) { |
Dirk Brandewie | 367dc4a | 2014-03-19 08:45:53 -0700 | [diff] [blame] | 1406 | cpufreq_driver->stop_cpu(policy); |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 1407 | } |
Venki Pallipadi | ec28297 | 2007-03-26 12:03:19 -0700 | [diff] [blame] | 1408 | |
Srivatsa S. Bhat | cedb70a | 2013-09-07 01:23:09 +0530 | [diff] [blame] | 1409 | return 0; |
| 1410 | } |
| 1411 | |
| 1412 | static int __cpufreq_remove_dev_finish(struct device *dev, |
Viresh Kumar | 96bbbe4 | 2014-03-10 14:53:35 +0530 | [diff] [blame] | 1413 | struct subsys_interface *sif) |
Srivatsa S. Bhat | cedb70a | 2013-09-07 01:23:09 +0530 | [diff] [blame] | 1414 | { |
| 1415 | unsigned int cpu = dev->id, cpus; |
| 1416 | int ret; |
| 1417 | unsigned long flags; |
| 1418 | struct cpufreq_policy *policy; |
Srivatsa S. Bhat | cedb70a | 2013-09-07 01:23:09 +0530 | [diff] [blame] | 1419 | |
| 1420 | read_lock_irqsave(&cpufreq_driver_lock, flags); |
| 1421 | policy = per_cpu(cpufreq_cpu_data, cpu); |
| 1422 | read_unlock_irqrestore(&cpufreq_driver_lock, flags); |
| 1423 | |
| 1424 | if (!policy) { |
| 1425 | pr_debug("%s: No cpu_data found\n", __func__); |
| 1426 | return -EINVAL; |
| 1427 | } |
| 1428 | |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 1429 | down_write(&policy->rwsem); |
Srivatsa S. Bhat | cedb70a | 2013-09-07 01:23:09 +0530 | [diff] [blame] | 1430 | cpus = cpumask_weight(policy->cpus); |
Viresh Kumar | 9c8f1ee | 2013-09-12 17:06:33 +0530 | [diff] [blame] | 1431 | |
| 1432 | if (cpus > 1) |
| 1433 | cpumask_clear_cpu(cpu, policy->cpus); |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 1434 | up_write(&policy->rwsem); |
Srivatsa S. Bhat | cedb70a | 2013-09-07 01:23:09 +0530 | [diff] [blame] | 1435 | |
Viresh Kumar | b8eed8a | 2013-01-14 13:23:03 +0000 | [diff] [blame] | 1436 | /* If cpu is last user of policy, free policy */ |
| 1437 | if (cpus == 1) { |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 1438 | if (has_target()) { |
Viresh Kumar | 3de9bde | 2013-08-06 22:53:13 +0530 | [diff] [blame] | 1439 | ret = __cpufreq_governor(policy, |
| 1440 | CPUFREQ_GOV_POLICY_EXIT); |
| 1441 | if (ret) { |
| 1442 | pr_err("%s: Failed to exit governor\n", |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 1443 | __func__); |
Viresh Kumar | 3de9bde | 2013-08-06 22:53:13 +0530 | [diff] [blame] | 1444 | return ret; |
| 1445 | } |
Viresh Kumar | edab2fb | 2013-08-20 12:08:22 +0530 | [diff] [blame] | 1446 | } |
Rafael J. Wysocki | 2a99859 | 2013-07-30 00:32:00 +0200 | [diff] [blame] | 1447 | |
Viresh Kumar | 96bbbe4 | 2014-03-10 14:53:35 +0530 | [diff] [blame] | 1448 | if (!cpufreq_suspended) |
Viresh Kumar | 42f921a | 2013-12-20 21:26:02 +0530 | [diff] [blame] | 1449 | cpufreq_policy_put_kobj(policy); |
Srivatsa S. Bhat | 8414809 | 2013-07-30 04:25:10 +0530 | [diff] [blame] | 1450 | |
| 1451 | /* |
| 1452 | * Perform the ->exit() even during light-weight tear-down, |
| 1453 | * since this is a core component, and is essential for the |
| 1454 | * subsequent light-weight ->init() to succeed. |
Viresh Kumar | b8eed8a | 2013-01-14 13:23:03 +0000 | [diff] [blame] | 1455 | */ |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 1456 | if (cpufreq_driver->exit) |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 1457 | cpufreq_driver->exit(policy); |
Viresh Kumar | b8eed8a | 2013-01-14 13:23:03 +0000 | [diff] [blame] | 1458 | |
Viresh Kumar | 9515f4d | 2013-08-20 12:08:23 +0530 | [diff] [blame] | 1459 | /* Remove policy from list of active policies */ |
| 1460 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
| 1461 | list_del(&policy->policy_list); |
| 1462 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
| 1463 | |
Viresh Kumar | 96bbbe4 | 2014-03-10 14:53:35 +0530 | [diff] [blame] | 1464 | if (!cpufreq_suspended) |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 1465 | cpufreq_policy_free(policy); |
Stratos Karafotis | e5c87b7 | 2014-03-19 23:29:17 +0200 | [diff] [blame] | 1466 | } else if (has_target()) { |
| 1467 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_START); |
| 1468 | if (!ret) |
| 1469 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); |
| 1470 | |
| 1471 | if (ret) { |
| 1472 | pr_err("%s: Failed to start governor\n", __func__); |
| 1473 | return ret; |
Rafael J. Wysocki | 2a99859 | 2013-07-30 00:32:00 +0200 | [diff] [blame] | 1474 | } |
Viresh Kumar | b8eed8a | 2013-01-14 13:23:03 +0000 | [diff] [blame] | 1475 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | |
Viresh Kumar | 474deff | 2013-08-20 12:08:25 +0530 | [diff] [blame] | 1477 | per_cpu(cpufreq_cpu_data, cpu) = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1478 | return 0; |
| 1479 | } |
| 1480 | |
Srivatsa S. Bhat | cedb70a | 2013-09-07 01:23:09 +0530 | [diff] [blame] | 1481 | /** |
Viresh Kumar | 27a862e | 2013-10-02 14:13:14 +0530 | [diff] [blame] | 1482 | * cpufreq_remove_dev - remove a CPU device |
Srivatsa S. Bhat | cedb70a | 2013-09-07 01:23:09 +0530 | [diff] [blame] | 1483 | * |
| 1484 | * Removes the cpufreq interface for a CPU device. |
Srivatsa S. Bhat | cedb70a | 2013-09-07 01:23:09 +0530 | [diff] [blame] | 1485 | */ |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 1486 | static int cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif) |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 1487 | { |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 1488 | unsigned int cpu = dev->id; |
Viresh Kumar | 27a862e | 2013-10-02 14:13:14 +0530 | [diff] [blame] | 1489 | int ret; |
Venki Pallipadi | ec28297 | 2007-03-26 12:03:19 -0700 | [diff] [blame] | 1490 | |
| 1491 | if (cpu_is_offline(cpu)) |
| 1492 | return 0; |
| 1493 | |
Viresh Kumar | 96bbbe4 | 2014-03-10 14:53:35 +0530 | [diff] [blame] | 1494 | ret = __cpufreq_remove_dev_prepare(dev, sif); |
Viresh Kumar | 27a862e | 2013-10-02 14:13:14 +0530 | [diff] [blame] | 1495 | |
| 1496 | if (!ret) |
Viresh Kumar | 96bbbe4 | 2014-03-10 14:53:35 +0530 | [diff] [blame] | 1497 | ret = __cpufreq_remove_dev_finish(dev, sif); |
Viresh Kumar | 27a862e | 2013-10-02 14:13:14 +0530 | [diff] [blame] | 1498 | |
| 1499 | return ret; |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 1500 | } |
| 1501 | |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 1502 | static void handle_update(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | { |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 1504 | struct cpufreq_policy *policy = |
| 1505 | container_of(work, struct cpufreq_policy, update); |
| 1506 | unsigned int cpu = policy->cpu; |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 1507 | pr_debug("handle_update for cpu %u called\n", cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | cpufreq_update_policy(cpu); |
| 1509 | } |
| 1510 | |
| 1511 | /** |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 1512 | * cpufreq_out_of_sync - If actual and saved CPU frequency differs, we're |
| 1513 | * in deep trouble. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | * @cpu: cpu number |
| 1515 | * @old_freq: CPU frequency the kernel thinks the CPU runs at |
| 1516 | * @new_freq: CPU frequency the CPU actually runs at |
| 1517 | * |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 1518 | * We adjust to current frequency first, and need to clean up later. |
| 1519 | * So either call to cpufreq_update_policy() or schedule handle_update()). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | */ |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 1521 | static void cpufreq_out_of_sync(unsigned int cpu, unsigned int old_freq, |
| 1522 | unsigned int new_freq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | { |
Viresh Kumar | b43a7ff | 2013-03-24 11:56:43 +0530 | [diff] [blame] | 1524 | struct cpufreq_policy *policy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | struct cpufreq_freqs freqs; |
Viresh Kumar | b43a7ff | 2013-03-24 11:56:43 +0530 | [diff] [blame] | 1526 | unsigned long flags; |
| 1527 | |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 1528 | pr_debug("Warning: CPU frequency out of sync: cpufreq and timing core thinks of %u, is %u kHz\n", |
| 1529 | old_freq, new_freq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | freqs.old = old_freq; |
| 1532 | freqs.new = new_freq; |
Viresh Kumar | b43a7ff | 2013-03-24 11:56:43 +0530 | [diff] [blame] | 1533 | |
| 1534 | read_lock_irqsave(&cpufreq_driver_lock, flags); |
| 1535 | policy = per_cpu(cpufreq_cpu_data, cpu); |
| 1536 | read_unlock_irqrestore(&cpufreq_driver_lock, flags); |
| 1537 | |
Viresh Kumar | 8fec051 | 2014-03-24 13:35:45 +0530 | [diff] [blame] | 1538 | cpufreq_freq_transition_begin(policy, &freqs); |
| 1539 | cpufreq_freq_transition_end(policy, &freqs, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1540 | } |
| 1541 | |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 1542 | /** |
Dhaval Giani | 4ab70df | 2006-12-13 14:49:15 +0530 | [diff] [blame] | 1543 | * cpufreq_quick_get - get the CPU frequency (in kHz) from policy->cur |
Venkatesh Pallipadi | 95235ca | 2005-12-02 10:43:20 -0800 | [diff] [blame] | 1544 | * @cpu: CPU number |
| 1545 | * |
| 1546 | * This is the last known freq, without actually getting it from the driver. |
| 1547 | * Return value will be same as what is shown in scaling_cur_freq in sysfs. |
| 1548 | */ |
| 1549 | unsigned int cpufreq_quick_get(unsigned int cpu) |
| 1550 | { |
Dirk Brandewie | 9e21ba8 | 2013-02-06 09:02:08 -0800 | [diff] [blame] | 1551 | struct cpufreq_policy *policy; |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 1552 | unsigned int ret_freq = 0; |
Venkatesh Pallipadi | 95235ca | 2005-12-02 10:43:20 -0800 | [diff] [blame] | 1553 | |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 1554 | if (cpufreq_driver && cpufreq_driver->setpolicy && cpufreq_driver->get) |
| 1555 | return cpufreq_driver->get(cpu); |
Dirk Brandewie | 9e21ba8 | 2013-02-06 09:02:08 -0800 | [diff] [blame] | 1556 | |
| 1557 | policy = cpufreq_cpu_get(cpu); |
Venkatesh Pallipadi | 95235ca | 2005-12-02 10:43:20 -0800 | [diff] [blame] | 1558 | if (policy) { |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 1559 | ret_freq = policy->cur; |
Venkatesh Pallipadi | 95235ca | 2005-12-02 10:43:20 -0800 | [diff] [blame] | 1560 | cpufreq_cpu_put(policy); |
| 1561 | } |
| 1562 | |
Dave Jones | 4d34a67 | 2008-02-07 16:33:49 -0500 | [diff] [blame] | 1563 | return ret_freq; |
Venkatesh Pallipadi | 95235ca | 2005-12-02 10:43:20 -0800 | [diff] [blame] | 1564 | } |
| 1565 | EXPORT_SYMBOL(cpufreq_quick_get); |
| 1566 | |
Jesse Barnes | 3d73710 | 2011-06-28 10:59:12 -0700 | [diff] [blame] | 1567 | /** |
| 1568 | * cpufreq_quick_get_max - get the max reported CPU frequency for this CPU |
| 1569 | * @cpu: CPU number |
| 1570 | * |
| 1571 | * Just return the max possible frequency for a given CPU. |
| 1572 | */ |
| 1573 | unsigned int cpufreq_quick_get_max(unsigned int cpu) |
| 1574 | { |
| 1575 | struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); |
| 1576 | unsigned int ret_freq = 0; |
| 1577 | |
| 1578 | if (policy) { |
| 1579 | ret_freq = policy->max; |
| 1580 | cpufreq_cpu_put(policy); |
| 1581 | } |
| 1582 | |
| 1583 | return ret_freq; |
| 1584 | } |
| 1585 | EXPORT_SYMBOL(cpufreq_quick_get_max); |
| 1586 | |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 1587 | static unsigned int __cpufreq_get(unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1588 | { |
Mike Travis | 7a6aedf | 2008-03-25 15:06:53 -0700 | [diff] [blame] | 1589 | struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 1590 | unsigned int ret_freq = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1591 | |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 1592 | if (!cpufreq_driver->get) |
Dave Jones | 4d34a67 | 2008-02-07 16:33:49 -0500 | [diff] [blame] | 1593 | return ret_freq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1594 | |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 1595 | ret_freq = cpufreq_driver->get(cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 1597 | if (ret_freq && policy->cur && |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 1598 | !(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) { |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 1599 | /* verify no discrepancy between actual and |
| 1600 | saved value exists */ |
| 1601 | if (unlikely(ret_freq != policy->cur)) { |
| 1602 | cpufreq_out_of_sync(cpu, policy->cur, ret_freq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1603 | schedule_work(&policy->update); |
| 1604 | } |
| 1605 | } |
| 1606 | |
Dave Jones | 4d34a67 | 2008-02-07 16:33:49 -0500 | [diff] [blame] | 1607 | return ret_freq; |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 1608 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 1610 | /** |
| 1611 | * cpufreq_get - get the current CPU frequency (in kHz) |
| 1612 | * @cpu: CPU number |
| 1613 | * |
| 1614 | * Get the CPU current (static) CPU frequency |
| 1615 | */ |
| 1616 | unsigned int cpufreq_get(unsigned int cpu) |
| 1617 | { |
Aaron Plattner | 999976e | 2014-03-04 12:42:15 -0800 | [diff] [blame] | 1618 | struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 1619 | unsigned int ret_freq = 0; |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 1620 | |
Aaron Plattner | 999976e | 2014-03-04 12:42:15 -0800 | [diff] [blame] | 1621 | if (policy) { |
| 1622 | down_read(&policy->rwsem); |
| 1623 | ret_freq = __cpufreq_get(cpu); |
| 1624 | up_read(&policy->rwsem); |
Viresh Kumar | 26ca869 | 2013-09-20 22:37:31 +0530 | [diff] [blame] | 1625 | |
Aaron Plattner | 999976e | 2014-03-04 12:42:15 -0800 | [diff] [blame] | 1626 | cpufreq_cpu_put(policy); |
| 1627 | } |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 1628 | |
Dave Jones | 4d34a67 | 2008-02-07 16:33:49 -0500 | [diff] [blame] | 1629 | return ret_freq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | } |
| 1631 | EXPORT_SYMBOL(cpufreq_get); |
| 1632 | |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 1633 | static struct subsys_interface cpufreq_interface = { |
| 1634 | .name = "cpufreq", |
| 1635 | .subsys = &cpu_subsys, |
| 1636 | .add_dev = cpufreq_add_dev, |
| 1637 | .remove_dev = cpufreq_remove_dev, |
Rafael J. Wysocki | e00e56d | 2011-03-23 22:16:32 +0100 | [diff] [blame] | 1638 | }; |
| 1639 | |
Viresh Kumar | e28867e | 2014-03-04 11:00:27 +0800 | [diff] [blame] | 1640 | /* |
| 1641 | * In case platform wants some specific frequency to be configured |
| 1642 | * during suspend.. |
Benjamin Herrenschmidt | 42d4dc3 | 2005-04-29 07:40:12 -0700 | [diff] [blame] | 1643 | */ |
Viresh Kumar | e28867e | 2014-03-04 11:00:27 +0800 | [diff] [blame] | 1644 | int cpufreq_generic_suspend(struct cpufreq_policy *policy) |
Benjamin Herrenschmidt | 42d4dc3 | 2005-04-29 07:40:12 -0700 | [diff] [blame] | 1645 | { |
Viresh Kumar | e28867e | 2014-03-04 11:00:27 +0800 | [diff] [blame] | 1646 | int ret; |
Dave Jones | 4bc5d34 | 2009-08-04 14:03:25 -0400 | [diff] [blame] | 1647 | |
Viresh Kumar | e28867e | 2014-03-04 11:00:27 +0800 | [diff] [blame] | 1648 | if (!policy->suspend_freq) { |
| 1649 | pr_err("%s: suspend_freq can't be zero\n", __func__); |
| 1650 | return -EINVAL; |
Benjamin Herrenschmidt | 42d4dc3 | 2005-04-29 07:40:12 -0700 | [diff] [blame] | 1651 | } |
| 1652 | |
Viresh Kumar | e28867e | 2014-03-04 11:00:27 +0800 | [diff] [blame] | 1653 | pr_debug("%s: Setting suspend-freq: %u\n", __func__, |
| 1654 | policy->suspend_freq); |
| 1655 | |
| 1656 | ret = __cpufreq_driver_target(policy, policy->suspend_freq, |
| 1657 | CPUFREQ_RELATION_H); |
| 1658 | if (ret) |
| 1659 | pr_err("%s: unable to set suspend-freq: %u. err: %d\n", |
| 1660 | __func__, policy->suspend_freq, ret); |
| 1661 | |
Dave Jones | c906049 | 2008-02-07 16:32:18 -0500 | [diff] [blame] | 1662 | return ret; |
Benjamin Herrenschmidt | 42d4dc3 | 2005-04-29 07:40:12 -0700 | [diff] [blame] | 1663 | } |
Viresh Kumar | e28867e | 2014-03-04 11:00:27 +0800 | [diff] [blame] | 1664 | EXPORT_SYMBOL(cpufreq_generic_suspend); |
Benjamin Herrenschmidt | 42d4dc3 | 2005-04-29 07:40:12 -0700 | [diff] [blame] | 1665 | |
| 1666 | /** |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1667 | * cpufreq_suspend() - Suspend CPUFreq governors |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1668 | * |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1669 | * Called during system wide Suspend/Hibernate cycles for suspending governors |
| 1670 | * as some platforms can't change frequency after this point in suspend cycle. |
| 1671 | * Because some of the devices (like: i2c, regulators, etc) they use for |
| 1672 | * changing frequency are suspended quickly after this point. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1673 | */ |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1674 | void cpufreq_suspend(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1675 | { |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 1676 | struct cpufreq_policy *policy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1677 | |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1678 | if (!cpufreq_driver) |
Rafael J. Wysocki | e00e56d | 2011-03-23 22:16:32 +0100 | [diff] [blame] | 1679 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1681 | if (!has_target()) |
Viresh Kumar | b1b12ba | 2014-09-30 09:33:17 +0530 | [diff] [blame] | 1682 | goto suspend; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1684 | pr_debug("%s: Suspending Governors\n", __func__); |
| 1685 | |
| 1686 | list_for_each_entry(policy, &cpufreq_policy_list, policy_list) { |
| 1687 | if (__cpufreq_governor(policy, CPUFREQ_GOV_STOP)) |
| 1688 | pr_err("%s: Failed to stop governor for policy: %p\n", |
| 1689 | __func__, policy); |
| 1690 | else if (cpufreq_driver->suspend |
| 1691 | && cpufreq_driver->suspend(policy)) |
| 1692 | pr_err("%s: Failed to suspend driver: %p\n", __func__, |
| 1693 | policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1694 | } |
Viresh Kumar | b1b12ba | 2014-09-30 09:33:17 +0530 | [diff] [blame] | 1695 | |
| 1696 | suspend: |
| 1697 | cpufreq_suspended = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | } |
| 1699 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1700 | /** |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1701 | * cpufreq_resume() - Resume CPUFreq governors |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1702 | * |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1703 | * Called during system wide Suspend/Hibernate cycle for resuming governors that |
| 1704 | * are suspended with cpufreq_suspend(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | */ |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1706 | void cpufreq_resume(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1707 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | struct cpufreq_policy *policy; |
| 1709 | |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1710 | if (!cpufreq_driver) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1711 | return; |
| 1712 | |
Lan Tianyu | 8e30444 | 2014-09-18 15:03:07 +0800 | [diff] [blame] | 1713 | cpufreq_suspended = false; |
| 1714 | |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1715 | if (!has_target()) |
| 1716 | return; |
| 1717 | |
| 1718 | pr_debug("%s: Resuming Governors\n", __func__); |
| 1719 | |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1720 | list_for_each_entry(policy, &cpufreq_policy_list, policy_list) { |
Viresh Kumar | 0c5aa40 | 2014-03-24 12:30:29 +0530 | [diff] [blame] | 1721 | if (cpufreq_driver->resume && cpufreq_driver->resume(policy)) |
| 1722 | pr_err("%s: Failed to resume driver: %p\n", __func__, |
| 1723 | policy); |
| 1724 | else if (__cpufreq_governor(policy, CPUFREQ_GOV_START) |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1725 | || __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS)) |
| 1726 | pr_err("%s: Failed to start governor for policy: %p\n", |
| 1727 | __func__, policy); |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 1728 | |
| 1729 | /* |
| 1730 | * schedule call cpufreq_update_policy() for boot CPU, i.e. last |
| 1731 | * policy in list. It will verify that the current freq is in |
| 1732 | * sync with what we believe it to be. |
| 1733 | */ |
| 1734 | if (list_is_last(&policy->policy_list, &cpufreq_policy_list)) |
| 1735 | schedule_work(&policy->update); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1736 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1737 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1738 | |
Borislav Petkov | 9d95046 | 2013-01-20 10:24:28 +0000 | [diff] [blame] | 1739 | /** |
| 1740 | * cpufreq_get_current_driver - return current driver's name |
| 1741 | * |
| 1742 | * Return the name string of the currently loaded cpufreq driver |
| 1743 | * or NULL, if none. |
| 1744 | */ |
| 1745 | const char *cpufreq_get_current_driver(void) |
| 1746 | { |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 1747 | if (cpufreq_driver) |
| 1748 | return cpufreq_driver->name; |
| 1749 | |
| 1750 | return NULL; |
Borislav Petkov | 9d95046 | 2013-01-20 10:24:28 +0000 | [diff] [blame] | 1751 | } |
| 1752 | EXPORT_SYMBOL_GPL(cpufreq_get_current_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1753 | |
Thomas Petazzoni | 51315cd | 2014-10-19 11:30:27 +0200 | [diff] [blame] | 1754 | /** |
| 1755 | * cpufreq_get_driver_data - return current driver data |
| 1756 | * |
| 1757 | * Return the private data of the currently loaded cpufreq |
| 1758 | * driver, or NULL if no cpufreq driver is loaded. |
| 1759 | */ |
| 1760 | void *cpufreq_get_driver_data(void) |
| 1761 | { |
| 1762 | if (cpufreq_driver) |
| 1763 | return cpufreq_driver->driver_data; |
| 1764 | |
| 1765 | return NULL; |
| 1766 | } |
| 1767 | EXPORT_SYMBOL_GPL(cpufreq_get_driver_data); |
| 1768 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1769 | /********************************************************************* |
| 1770 | * NOTIFIER LISTS INTERFACE * |
| 1771 | *********************************************************************/ |
| 1772 | |
| 1773 | /** |
| 1774 | * cpufreq_register_notifier - register a driver with cpufreq |
| 1775 | * @nb: notifier function to register |
| 1776 | * @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER |
| 1777 | * |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 1778 | * 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] | 1779 | * are notified about clock rate changes (once before and once after |
| 1780 | * the transition), or a list of drivers that are notified about |
| 1781 | * changes in cpufreq policy. |
| 1782 | * |
| 1783 | * This function may sleep, and has the same return conditions as |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 1784 | * blocking_notifier_chain_register. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1785 | */ |
| 1786 | int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list) |
| 1787 | { |
| 1788 | int ret; |
| 1789 | |
Dirk Brandewie | d5aaffa | 2013-01-17 16:22:21 +0000 | [diff] [blame] | 1790 | if (cpufreq_disabled()) |
| 1791 | return -EINVAL; |
| 1792 | |
Cesar Eduardo Barros | 74212ca | 2008-02-16 08:41:24 -0200 | [diff] [blame] | 1793 | WARN_ON(!init_cpufreq_transition_notifier_list_called); |
| 1794 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1795 | switch (list) { |
| 1796 | case CPUFREQ_TRANSITION_NOTIFIER: |
Alan Stern | b4dfdbb | 2006-10-04 02:17:06 -0700 | [diff] [blame] | 1797 | ret = srcu_notifier_chain_register( |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 1798 | &cpufreq_transition_notifier_list, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1799 | break; |
| 1800 | case CPUFREQ_POLICY_NOTIFIER: |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 1801 | ret = blocking_notifier_chain_register( |
| 1802 | &cpufreq_policy_notifier_list, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1803 | break; |
| 1804 | default: |
| 1805 | ret = -EINVAL; |
| 1806 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1807 | |
| 1808 | return ret; |
| 1809 | } |
| 1810 | EXPORT_SYMBOL(cpufreq_register_notifier); |
| 1811 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1812 | /** |
| 1813 | * cpufreq_unregister_notifier - unregister a driver with cpufreq |
| 1814 | * @nb: notifier block to be unregistered |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 1815 | * @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1816 | * |
| 1817 | * Remove a driver from the CPU frequency notifier list. |
| 1818 | * |
| 1819 | * This function may sleep, and has the same return conditions as |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 1820 | * blocking_notifier_chain_unregister. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1821 | */ |
| 1822 | int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list) |
| 1823 | { |
| 1824 | int ret; |
| 1825 | |
Dirk Brandewie | d5aaffa | 2013-01-17 16:22:21 +0000 | [diff] [blame] | 1826 | if (cpufreq_disabled()) |
| 1827 | return -EINVAL; |
| 1828 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1829 | switch (list) { |
| 1830 | case CPUFREQ_TRANSITION_NOTIFIER: |
Alan Stern | b4dfdbb | 2006-10-04 02:17:06 -0700 | [diff] [blame] | 1831 | ret = srcu_notifier_chain_unregister( |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 1832 | &cpufreq_transition_notifier_list, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1833 | break; |
| 1834 | case CPUFREQ_POLICY_NOTIFIER: |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 1835 | ret = blocking_notifier_chain_unregister( |
| 1836 | &cpufreq_policy_notifier_list, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1837 | break; |
| 1838 | default: |
| 1839 | ret = -EINVAL; |
| 1840 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1841 | |
| 1842 | return ret; |
| 1843 | } |
| 1844 | EXPORT_SYMBOL(cpufreq_unregister_notifier); |
| 1845 | |
| 1846 | |
| 1847 | /********************************************************************* |
| 1848 | * GOVERNORS * |
| 1849 | *********************************************************************/ |
| 1850 | |
Viresh Kumar | 1c03a2d | 2014-06-02 22:49:28 +0530 | [diff] [blame] | 1851 | /* Must set freqs->new to intermediate frequency */ |
| 1852 | static int __target_intermediate(struct cpufreq_policy *policy, |
| 1853 | struct cpufreq_freqs *freqs, int index) |
| 1854 | { |
| 1855 | int ret; |
| 1856 | |
| 1857 | freqs->new = cpufreq_driver->get_intermediate(policy, index); |
| 1858 | |
| 1859 | /* We don't need to switch to intermediate freq */ |
| 1860 | if (!freqs->new) |
| 1861 | return 0; |
| 1862 | |
| 1863 | pr_debug("%s: cpu: %d, switching to intermediate freq: oldfreq: %u, intermediate freq: %u\n", |
| 1864 | __func__, policy->cpu, freqs->old, freqs->new); |
| 1865 | |
| 1866 | cpufreq_freq_transition_begin(policy, freqs); |
| 1867 | ret = cpufreq_driver->target_intermediate(policy, index); |
| 1868 | cpufreq_freq_transition_end(policy, freqs, ret); |
| 1869 | |
| 1870 | if (ret) |
| 1871 | pr_err("%s: Failed to change to intermediate frequency: %d\n", |
| 1872 | __func__, ret); |
| 1873 | |
| 1874 | return ret; |
| 1875 | } |
| 1876 | |
Viresh Kumar | 8d65775 | 2014-05-21 14:29:29 +0530 | [diff] [blame] | 1877 | static int __target_index(struct cpufreq_policy *policy, |
| 1878 | struct cpufreq_frequency_table *freq_table, int index) |
| 1879 | { |
Viresh Kumar | 1c03a2d | 2014-06-02 22:49:28 +0530 | [diff] [blame] | 1880 | struct cpufreq_freqs freqs = {.old = policy->cur, .flags = 0}; |
| 1881 | unsigned int intermediate_freq = 0; |
Viresh Kumar | 8d65775 | 2014-05-21 14:29:29 +0530 | [diff] [blame] | 1882 | int retval = -EINVAL; |
| 1883 | bool notify; |
| 1884 | |
| 1885 | notify = !(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION); |
Viresh Kumar | 8d65775 | 2014-05-21 14:29:29 +0530 | [diff] [blame] | 1886 | if (notify) { |
Viresh Kumar | 1c03a2d | 2014-06-02 22:49:28 +0530 | [diff] [blame] | 1887 | /* Handle switching to intermediate frequency */ |
| 1888 | if (cpufreq_driver->get_intermediate) { |
| 1889 | retval = __target_intermediate(policy, &freqs, index); |
| 1890 | if (retval) |
| 1891 | return retval; |
Viresh Kumar | 8d65775 | 2014-05-21 14:29:29 +0530 | [diff] [blame] | 1892 | |
Viresh Kumar | 1c03a2d | 2014-06-02 22:49:28 +0530 | [diff] [blame] | 1893 | intermediate_freq = freqs.new; |
| 1894 | /* Set old freq to intermediate */ |
| 1895 | if (intermediate_freq) |
| 1896 | freqs.old = freqs.new; |
| 1897 | } |
| 1898 | |
| 1899 | freqs.new = freq_table[index].frequency; |
Viresh Kumar | 8d65775 | 2014-05-21 14:29:29 +0530 | [diff] [blame] | 1900 | pr_debug("%s: cpu: %d, oldfreq: %u, new freq: %u\n", |
| 1901 | __func__, policy->cpu, freqs.old, freqs.new); |
| 1902 | |
| 1903 | cpufreq_freq_transition_begin(policy, &freqs); |
| 1904 | } |
| 1905 | |
| 1906 | retval = cpufreq_driver->target_index(policy, index); |
| 1907 | if (retval) |
| 1908 | pr_err("%s: Failed to change cpu frequency: %d\n", __func__, |
| 1909 | retval); |
| 1910 | |
Viresh Kumar | 1c03a2d | 2014-06-02 22:49:28 +0530 | [diff] [blame] | 1911 | if (notify) { |
Viresh Kumar | 8d65775 | 2014-05-21 14:29:29 +0530 | [diff] [blame] | 1912 | cpufreq_freq_transition_end(policy, &freqs, retval); |
| 1913 | |
Viresh Kumar | 1c03a2d | 2014-06-02 22:49:28 +0530 | [diff] [blame] | 1914 | /* |
| 1915 | * Failed after setting to intermediate freq? Driver should have |
| 1916 | * reverted back to initial frequency and so should we. Check |
| 1917 | * here for intermediate_freq instead of get_intermediate, in |
| 1918 | * case we have't switched to intermediate freq at all. |
| 1919 | */ |
| 1920 | if (unlikely(retval && intermediate_freq)) { |
| 1921 | freqs.old = intermediate_freq; |
| 1922 | freqs.new = policy->restore_freq; |
| 1923 | cpufreq_freq_transition_begin(policy, &freqs); |
| 1924 | cpufreq_freq_transition_end(policy, &freqs, 0); |
| 1925 | } |
| 1926 | } |
| 1927 | |
Viresh Kumar | 8d65775 | 2014-05-21 14:29:29 +0530 | [diff] [blame] | 1928 | return retval; |
| 1929 | } |
| 1930 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1931 | int __cpufreq_driver_target(struct cpufreq_policy *policy, |
| 1932 | unsigned int target_freq, |
| 1933 | unsigned int relation) |
| 1934 | { |
Viresh Kumar | 7249924 | 2012-10-31 01:28:21 +0100 | [diff] [blame] | 1935 | unsigned int old_target_freq = target_freq; |
Viresh Kumar | 8d65775 | 2014-05-21 14:29:29 +0530 | [diff] [blame] | 1936 | int retval = -EINVAL; |
Ashok Raj | c32b6b8 | 2005-10-30 14:59:54 -0800 | [diff] [blame] | 1937 | |
Konrad Rzeszutek Wilk | a7b422c | 2012-03-13 19:18:39 -0400 | [diff] [blame] | 1938 | if (cpufreq_disabled()) |
| 1939 | return -ENODEV; |
| 1940 | |
Viresh Kumar | 7249924 | 2012-10-31 01:28:21 +0100 | [diff] [blame] | 1941 | /* Make sure that target_freq is within supported range */ |
| 1942 | if (target_freq > policy->max) |
| 1943 | target_freq = policy->max; |
| 1944 | if (target_freq < policy->min) |
| 1945 | target_freq = policy->min; |
| 1946 | |
| 1947 | 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] | 1948 | policy->cpu, target_freq, relation, old_target_freq); |
Viresh Kumar | 5a1c022 | 2012-10-31 01:28:15 +0100 | [diff] [blame] | 1949 | |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 1950 | /* |
| 1951 | * This might look like a redundant call as we are checking it again |
| 1952 | * after finding index. But it is left intentionally for cases where |
| 1953 | * exactly same freq is called again and so we can save on few function |
| 1954 | * calls. |
| 1955 | */ |
Viresh Kumar | 5a1c022 | 2012-10-31 01:28:15 +0100 | [diff] [blame] | 1956 | if (target_freq == policy->cur) |
| 1957 | return 0; |
| 1958 | |
Viresh Kumar | 1c03a2d | 2014-06-02 22:49:28 +0530 | [diff] [blame] | 1959 | /* Save last value to restore later on errors */ |
| 1960 | policy->restore_freq = policy->cur; |
| 1961 | |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 1962 | if (cpufreq_driver->target) |
| 1963 | retval = cpufreq_driver->target(policy, target_freq, relation); |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 1964 | else if (cpufreq_driver->target_index) { |
| 1965 | struct cpufreq_frequency_table *freq_table; |
| 1966 | int index; |
Ashok Raj | 90d45d1 | 2005-11-08 21:34:24 -0800 | [diff] [blame] | 1967 | |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 1968 | freq_table = cpufreq_frequency_get_table(policy->cpu); |
| 1969 | if (unlikely(!freq_table)) { |
| 1970 | pr_err("%s: Unable to find freq_table\n", __func__); |
| 1971 | goto out; |
| 1972 | } |
| 1973 | |
| 1974 | retval = cpufreq_frequency_table_target(policy, freq_table, |
| 1975 | target_freq, relation, &index); |
| 1976 | if (unlikely(retval)) { |
| 1977 | pr_err("%s: Unable to find matching freq\n", __func__); |
| 1978 | goto out; |
| 1979 | } |
| 1980 | |
Viresh Kumar | d4019f0 | 2013-08-14 19:38:24 +0530 | [diff] [blame] | 1981 | if (freq_table[index].frequency == policy->cur) { |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 1982 | retval = 0; |
Viresh Kumar | d4019f0 | 2013-08-14 19:38:24 +0530 | [diff] [blame] | 1983 | goto out; |
| 1984 | } |
| 1985 | |
Viresh Kumar | 8d65775 | 2014-05-21 14:29:29 +0530 | [diff] [blame] | 1986 | retval = __target_index(policy, freq_table, index); |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 1987 | } |
| 1988 | |
| 1989 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1990 | return retval; |
| 1991 | } |
| 1992 | EXPORT_SYMBOL_GPL(__cpufreq_driver_target); |
| 1993 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1994 | int cpufreq_driver_target(struct cpufreq_policy *policy, |
| 1995 | unsigned int target_freq, |
| 1996 | unsigned int relation) |
| 1997 | { |
Julia Lawall | f1829e4 | 2008-07-25 22:44:53 +0200 | [diff] [blame] | 1998 | int ret = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1999 | |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 2000 | down_write(&policy->rwsem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2001 | |
| 2002 | ret = __cpufreq_driver_target(policy, target_freq, relation); |
| 2003 | |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 2004 | up_write(&policy->rwsem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2005 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2006 | return ret; |
| 2007 | } |
| 2008 | EXPORT_SYMBOL_GPL(cpufreq_driver_target); |
| 2009 | |
Arjan van de Ven | 153d7f3 | 2006-07-26 15:40:07 +0200 | [diff] [blame] | 2010 | /* |
Arjan van de Ven | 153d7f3 | 2006-07-26 15:40:07 +0200 | [diff] [blame] | 2011 | * when "event" is CPUFREQ_GOV_LIMITS |
| 2012 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2013 | |
Gautham R Shenoy | e08f5f5 | 2006-10-26 16:20:58 +0530 | [diff] [blame] | 2014 | static int __cpufreq_governor(struct cpufreq_policy *policy, |
| 2015 | unsigned int event) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2016 | { |
Dave Jones | cc993ca | 2005-07-28 09:43:56 -0700 | [diff] [blame] | 2017 | int ret; |
Thomas Renninger | 6afde10 | 2007-10-02 13:28:13 -0700 | [diff] [blame] | 2018 | |
| 2019 | /* Only must be defined when default governor is known to have latency |
| 2020 | restrictions, like e.g. conservative or ondemand. |
| 2021 | That this is the case is already ensured in Kconfig |
| 2022 | */ |
| 2023 | #ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE |
| 2024 | struct cpufreq_governor *gov = &cpufreq_gov_performance; |
| 2025 | #else |
| 2026 | struct cpufreq_governor *gov = NULL; |
| 2027 | #endif |
Thomas Renninger | 1c25624 | 2007-10-02 13:28:12 -0700 | [diff] [blame] | 2028 | |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 2029 | /* Don't start any governor operations if we are entering suspend */ |
| 2030 | if (cpufreq_suspended) |
| 2031 | return 0; |
Ethan Zhao | cb57720 | 2014-12-18 15:28:19 +0900 | [diff] [blame] | 2032 | /* |
| 2033 | * Governor might not be initiated here if ACPI _PPC changed |
| 2034 | * notification happened, so check it. |
| 2035 | */ |
| 2036 | if (!policy->governor) |
| 2037 | return -EINVAL; |
Viresh Kumar | 2f0aea9 | 2014-03-04 11:00:26 +0800 | [diff] [blame] | 2038 | |
Thomas Renninger | 1c25624 | 2007-10-02 13:28:12 -0700 | [diff] [blame] | 2039 | if (policy->governor->max_transition_latency && |
| 2040 | policy->cpuinfo.transition_latency > |
| 2041 | policy->governor->max_transition_latency) { |
Thomas Renninger | 6afde10 | 2007-10-02 13:28:13 -0700 | [diff] [blame] | 2042 | if (!gov) |
| 2043 | return -EINVAL; |
| 2044 | else { |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 2045 | pr_warn("%s governor failed, too long transition latency of HW, fallback to %s governor\n", |
| 2046 | policy->governor->name, gov->name); |
Thomas Renninger | 6afde10 | 2007-10-02 13:28:13 -0700 | [diff] [blame] | 2047 | policy->governor = gov; |
| 2048 | } |
Thomas Renninger | 1c25624 | 2007-10-02 13:28:12 -0700 | [diff] [blame] | 2049 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2050 | |
Viresh Kumar | fe492f3 | 2013-08-06 22:53:10 +0530 | [diff] [blame] | 2051 | if (event == CPUFREQ_GOV_POLICY_INIT) |
| 2052 | if (!try_module_get(policy->governor->owner)) |
| 2053 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2054 | |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 2055 | pr_debug("__cpufreq_governor for CPU %u, event %u\n", |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 2056 | policy->cpu, event); |
Xiaoguang Chen | 95731eb | 2013-06-19 15:00:07 +0800 | [diff] [blame] | 2057 | |
| 2058 | mutex_lock(&cpufreq_governor_lock); |
Srivatsa S. Bhat | 56d07db | 2013-09-07 01:23:55 +0530 | [diff] [blame] | 2059 | if ((policy->governor_enabled && event == CPUFREQ_GOV_START) |
Viresh Kumar | f73d393 | 2013-08-31 17:53:40 +0530 | [diff] [blame] | 2060 | || (!policy->governor_enabled |
| 2061 | && (event == CPUFREQ_GOV_LIMITS || event == CPUFREQ_GOV_STOP))) { |
Xiaoguang Chen | 95731eb | 2013-06-19 15:00:07 +0800 | [diff] [blame] | 2062 | mutex_unlock(&cpufreq_governor_lock); |
| 2063 | return -EBUSY; |
| 2064 | } |
| 2065 | |
| 2066 | if (event == CPUFREQ_GOV_STOP) |
| 2067 | policy->governor_enabled = false; |
| 2068 | else if (event == CPUFREQ_GOV_START) |
| 2069 | policy->governor_enabled = true; |
| 2070 | |
| 2071 | mutex_unlock(&cpufreq_governor_lock); |
| 2072 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2073 | ret = policy->governor->governor(policy, event); |
| 2074 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 2075 | if (!ret) { |
| 2076 | if (event == CPUFREQ_GOV_POLICY_INIT) |
| 2077 | policy->governor->initialized++; |
| 2078 | else if (event == CPUFREQ_GOV_POLICY_EXIT) |
| 2079 | policy->governor->initialized--; |
Xiaoguang Chen | 95731eb | 2013-06-19 15:00:07 +0800 | [diff] [blame] | 2080 | } else { |
| 2081 | /* Restore original values */ |
| 2082 | mutex_lock(&cpufreq_governor_lock); |
| 2083 | if (event == CPUFREQ_GOV_STOP) |
| 2084 | policy->governor_enabled = true; |
| 2085 | else if (event == CPUFREQ_GOV_START) |
| 2086 | policy->governor_enabled = false; |
| 2087 | mutex_unlock(&cpufreq_governor_lock); |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 2088 | } |
Viresh Kumar | b394058 | 2013-02-01 05:42:58 +0000 | [diff] [blame] | 2089 | |
Viresh Kumar | fe492f3 | 2013-08-06 22:53:10 +0530 | [diff] [blame] | 2090 | if (((event == CPUFREQ_GOV_POLICY_INIT) && ret) || |
| 2091 | ((event == CPUFREQ_GOV_POLICY_EXIT) && !ret)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2092 | module_put(policy->governor->owner); |
| 2093 | |
| 2094 | return ret; |
| 2095 | } |
| 2096 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2097 | int cpufreq_register_governor(struct cpufreq_governor *governor) |
| 2098 | { |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 2099 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2100 | |
| 2101 | if (!governor) |
| 2102 | return -EINVAL; |
| 2103 | |
Konrad Rzeszutek Wilk | a7b422c | 2012-03-13 19:18:39 -0400 | [diff] [blame] | 2104 | if (cpufreq_disabled()) |
| 2105 | return -ENODEV; |
| 2106 | |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 2107 | mutex_lock(&cpufreq_governor_mutex); |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 2108 | |
Viresh Kumar | b394058 | 2013-02-01 05:42:58 +0000 | [diff] [blame] | 2109 | governor->initialized = 0; |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 2110 | err = -EBUSY; |
| 2111 | if (__find_governor(governor->name) == NULL) { |
| 2112 | err = 0; |
| 2113 | list_add(&governor->governor_list, &cpufreq_governor_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2114 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2115 | |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 2116 | mutex_unlock(&cpufreq_governor_mutex); |
Jeremy Fitzhardinge | 3bcb09a | 2006-07-06 12:30:26 -0700 | [diff] [blame] | 2117 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2118 | } |
| 2119 | EXPORT_SYMBOL_GPL(cpufreq_register_governor); |
| 2120 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2121 | void cpufreq_unregister_governor(struct cpufreq_governor *governor) |
| 2122 | { |
Prarit Bhargava | 90e41ba | 2009-11-12 09:18:46 -0500 | [diff] [blame] | 2123 | int cpu; |
Prarit Bhargava | 90e41ba | 2009-11-12 09:18:46 -0500 | [diff] [blame] | 2124 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2125 | if (!governor) |
| 2126 | return; |
| 2127 | |
Konrad Rzeszutek Wilk | a7b422c | 2012-03-13 19:18:39 -0400 | [diff] [blame] | 2128 | if (cpufreq_disabled()) |
| 2129 | return; |
| 2130 | |
Prarit Bhargava | 90e41ba | 2009-11-12 09:18:46 -0500 | [diff] [blame] | 2131 | for_each_present_cpu(cpu) { |
| 2132 | if (cpu_online(cpu)) |
| 2133 | continue; |
| 2134 | if (!strcmp(per_cpu(cpufreq_cpu_governor, cpu), governor->name)) |
| 2135 | strcpy(per_cpu(cpufreq_cpu_governor, cpu), "\0"); |
| 2136 | } |
Prarit Bhargava | 90e41ba | 2009-11-12 09:18:46 -0500 | [diff] [blame] | 2137 | |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 2138 | mutex_lock(&cpufreq_governor_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2139 | list_del(&governor->governor_list); |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 2140 | mutex_unlock(&cpufreq_governor_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2141 | return; |
| 2142 | } |
| 2143 | EXPORT_SYMBOL_GPL(cpufreq_unregister_governor); |
| 2144 | |
| 2145 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2146 | /********************************************************************* |
| 2147 | * POLICY INTERFACE * |
| 2148 | *********************************************************************/ |
| 2149 | |
| 2150 | /** |
| 2151 | * cpufreq_get_policy - get the current cpufreq_policy |
Dave Jones | 29464f2 | 2009-01-18 01:37:11 -0500 | [diff] [blame] | 2152 | * @policy: struct cpufreq_policy into which the current cpufreq_policy |
| 2153 | * is written |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2154 | * |
| 2155 | * Reads the current cpufreq policy. |
| 2156 | */ |
| 2157 | int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu) |
| 2158 | { |
| 2159 | struct cpufreq_policy *cpu_policy; |
| 2160 | if (!policy) |
| 2161 | return -EINVAL; |
| 2162 | |
| 2163 | cpu_policy = cpufreq_cpu_get(cpu); |
| 2164 | if (!cpu_policy) |
| 2165 | return -EINVAL; |
| 2166 | |
Viresh Kumar | d5b73cd | 2013-08-06 22:53:06 +0530 | [diff] [blame] | 2167 | memcpy(policy, cpu_policy, sizeof(*policy)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2168 | |
| 2169 | cpufreq_cpu_put(cpu_policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2170 | return 0; |
| 2171 | } |
| 2172 | EXPORT_SYMBOL(cpufreq_get_policy); |
| 2173 | |
Arjan van de Ven | 153d7f3 | 2006-07-26 15:40:07 +0200 | [diff] [blame] | 2174 | /* |
Viresh Kumar | 037ce83 | 2013-10-02 14:13:16 +0530 | [diff] [blame] | 2175 | * policy : current policy. |
| 2176 | * new_policy: policy to be set. |
Arjan van de Ven | 153d7f3 | 2006-07-26 15:40:07 +0200 | [diff] [blame] | 2177 | */ |
Viresh Kumar | 037ce83 | 2013-10-02 14:13:16 +0530 | [diff] [blame] | 2178 | static int cpufreq_set_policy(struct cpufreq_policy *policy, |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2179 | struct cpufreq_policy *new_policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2180 | { |
Rafael J. Wysocki | d9a789c | 2014-02-17 22:56:35 +0100 | [diff] [blame] | 2181 | struct cpufreq_governor *old_gov; |
| 2182 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2183 | |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 2184 | pr_debug("setting new policy for CPU %u: %u - %u kHz\n", |
| 2185 | new_policy->cpu, new_policy->min, new_policy->max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2186 | |
Viresh Kumar | d5b73cd | 2013-08-06 22:53:06 +0530 | [diff] [blame] | 2187 | memcpy(&new_policy->cpuinfo, &policy->cpuinfo, sizeof(policy->cpuinfo)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2188 | |
Rafael J. Wysocki | d9a789c | 2014-02-17 22:56:35 +0100 | [diff] [blame] | 2189 | if (new_policy->min > policy->max || new_policy->max < policy->min) |
| 2190 | return -EINVAL; |
Mattia Dongili | 9c9a43e | 2006-07-05 23:12:20 +0200 | [diff] [blame] | 2191 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2192 | /* verify the cpu speed can be set within this limit */ |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2193 | ret = cpufreq_driver->verify(new_policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2194 | if (ret) |
Rafael J. Wysocki | d9a789c | 2014-02-17 22:56:35 +0100 | [diff] [blame] | 2195 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2196 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2197 | /* adjust if necessary - all reasons */ |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 2198 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2199 | CPUFREQ_ADJUST, new_policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2200 | |
| 2201 | /* adjust if necessary - hardware incompatibility*/ |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 2202 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2203 | CPUFREQ_INCOMPATIBLE, new_policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2204 | |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 2205 | /* |
| 2206 | * verify the cpu speed can be set within this limit, which might be |
| 2207 | * different to the first one |
| 2208 | */ |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2209 | ret = cpufreq_driver->verify(new_policy); |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 2210 | if (ret) |
Rafael J. Wysocki | d9a789c | 2014-02-17 22:56:35 +0100 | [diff] [blame] | 2211 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2212 | |
| 2213 | /* notification of the new policy */ |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 2214 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2215 | CPUFREQ_NOTIFY, new_policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2216 | |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2217 | policy->min = new_policy->min; |
| 2218 | policy->max = new_policy->max; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2219 | |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 2220 | pr_debug("new min and max freqs are %u - %u kHz\n", |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 2221 | policy->min, policy->max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2222 | |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 2223 | if (cpufreq_driver->setpolicy) { |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2224 | policy->policy = new_policy->policy; |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 2225 | pr_debug("setting range\n"); |
Rafael J. Wysocki | d9a789c | 2014-02-17 22:56:35 +0100 | [diff] [blame] | 2226 | return cpufreq_driver->setpolicy(new_policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2227 | } |
| 2228 | |
Rafael J. Wysocki | d9a789c | 2014-02-17 22:56:35 +0100 | [diff] [blame] | 2229 | if (new_policy->governor == policy->governor) |
| 2230 | goto out; |
| 2231 | |
| 2232 | pr_debug("governor switch\n"); |
| 2233 | |
| 2234 | /* save old, working values */ |
| 2235 | old_gov = policy->governor; |
| 2236 | /* end old governor */ |
| 2237 | if (old_gov) { |
| 2238 | __cpufreq_governor(policy, CPUFREQ_GOV_STOP); |
| 2239 | up_write(&policy->rwsem); |
Stratos Karafotis | e5c87b7 | 2014-03-19 23:29:17 +0200 | [diff] [blame] | 2240 | __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); |
Rafael J. Wysocki | d9a789c | 2014-02-17 22:56:35 +0100 | [diff] [blame] | 2241 | down_write(&policy->rwsem); |
| 2242 | } |
| 2243 | |
| 2244 | /* start new governor */ |
| 2245 | policy->governor = new_policy->governor; |
| 2246 | if (!__cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT)) { |
| 2247 | if (!__cpufreq_governor(policy, CPUFREQ_GOV_START)) |
| 2248 | goto out; |
| 2249 | |
| 2250 | up_write(&policy->rwsem); |
| 2251 | __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); |
| 2252 | down_write(&policy->rwsem); |
| 2253 | } |
| 2254 | |
| 2255 | /* new governor failed, so re-start old one */ |
| 2256 | pr_debug("starting governor %s failed\n", policy->governor->name); |
| 2257 | if (old_gov) { |
| 2258 | policy->governor = old_gov; |
| 2259 | __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT); |
| 2260 | __cpufreq_governor(policy, CPUFREQ_GOV_START); |
| 2261 | } |
| 2262 | |
| 2263 | return -EINVAL; |
| 2264 | |
| 2265 | out: |
| 2266 | pr_debug("governor: change or update limits\n"); |
| 2267 | return __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2268 | } |
| 2269 | |
| 2270 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2271 | * cpufreq_update_policy - re-evaluate an existing cpufreq policy |
| 2272 | * @cpu: CPU which shall be re-evaluated |
| 2273 | * |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2274 | * Useful for policy notifiers which have different necessities |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2275 | * at different times. |
| 2276 | */ |
| 2277 | int cpufreq_update_policy(unsigned int cpu) |
| 2278 | { |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2279 | struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); |
| 2280 | struct cpufreq_policy new_policy; |
Julia Lawall | f1829e4 | 2008-07-25 22:44:53 +0200 | [diff] [blame] | 2281 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2282 | |
Aaron Plattner | fefa8ff | 2014-06-18 11:27:32 -0700 | [diff] [blame] | 2283 | if (!policy) |
| 2284 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2285 | |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 2286 | down_write(&policy->rwsem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2287 | |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 2288 | pr_debug("updating policy for CPU %u\n", cpu); |
Viresh Kumar | d5b73cd | 2013-08-06 22:53:06 +0530 | [diff] [blame] | 2289 | memcpy(&new_policy, policy, sizeof(*policy)); |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2290 | new_policy.min = policy->user_policy.min; |
| 2291 | new_policy.max = policy->user_policy.max; |
| 2292 | new_policy.policy = policy->user_policy.policy; |
| 2293 | new_policy.governor = policy->user_policy.governor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2294 | |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 2295 | /* |
| 2296 | * BIOS might change freq behind our back |
| 2297 | * -> ask driver for current freq and notify governors about a change |
| 2298 | */ |
Rafael J. Wysocki | 2ed99e3 | 2014-03-12 21:49:33 +0100 | [diff] [blame] | 2299 | if (cpufreq_driver->get && !cpufreq_driver->setpolicy) { |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2300 | new_policy.cur = cpufreq_driver->get(cpu); |
Viresh Kumar | bd0fa9b | 2014-02-25 14:29:44 +0530 | [diff] [blame] | 2301 | if (WARN_ON(!new_policy.cur)) { |
| 2302 | ret = -EIO; |
Aaron Plattner | fefa8ff | 2014-06-18 11:27:32 -0700 | [diff] [blame] | 2303 | goto unlock; |
Viresh Kumar | bd0fa9b | 2014-02-25 14:29:44 +0530 | [diff] [blame] | 2304 | } |
| 2305 | |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2306 | if (!policy->cur) { |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 2307 | pr_debug("Driver did not initialize current freq\n"); |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2308 | policy->cur = new_policy.cur; |
Thomas Renninger | a85f7bd | 2006-02-01 11:36:04 +0100 | [diff] [blame] | 2309 | } else { |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 2310 | if (policy->cur != new_policy.cur && has_target()) |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2311 | cpufreq_out_of_sync(cpu, policy->cur, |
| 2312 | new_policy.cur); |
Thomas Renninger | a85f7bd | 2006-02-01 11:36:04 +0100 | [diff] [blame] | 2313 | } |
Thomas Renninger | 0961dd0 | 2006-01-26 18:46:33 +0100 | [diff] [blame] | 2314 | } |
| 2315 | |
Viresh Kumar | 037ce83 | 2013-10-02 14:13:16 +0530 | [diff] [blame] | 2316 | ret = cpufreq_set_policy(policy, &new_policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2317 | |
Aaron Plattner | fefa8ff | 2014-06-18 11:27:32 -0700 | [diff] [blame] | 2318 | unlock: |
viresh kumar | ad7722d | 2013-10-18 19:10:15 +0530 | [diff] [blame] | 2319 | up_write(&policy->rwsem); |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 2320 | |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 2321 | cpufreq_cpu_put(policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2322 | return ret; |
| 2323 | } |
| 2324 | EXPORT_SYMBOL(cpufreq_update_policy); |
| 2325 | |
Paul Gortmaker | 2760984 | 2013-06-19 13:54:04 -0400 | [diff] [blame] | 2326 | static int cpufreq_cpu_callback(struct notifier_block *nfb, |
Ashok Raj | c32b6b8 | 2005-10-30 14:59:54 -0800 | [diff] [blame] | 2327 | unsigned long action, void *hcpu) |
| 2328 | { |
| 2329 | unsigned int cpu = (unsigned long)hcpu; |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 2330 | struct device *dev; |
Ashok Raj | c32b6b8 | 2005-10-30 14:59:54 -0800 | [diff] [blame] | 2331 | |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 2332 | dev = get_cpu_device(cpu); |
| 2333 | if (dev) { |
Srivatsa S. Bhat | 5302c3f | 2013-07-30 04:25:25 +0530 | [diff] [blame] | 2334 | switch (action & ~CPU_TASKS_FROZEN) { |
Ashok Raj | c32b6b8 | 2005-10-30 14:59:54 -0800 | [diff] [blame] | 2335 | case CPU_ONLINE: |
Viresh Kumar | 96bbbe4 | 2014-03-10 14:53:35 +0530 | [diff] [blame] | 2336 | __cpufreq_add_dev(dev, NULL); |
Ashok Raj | c32b6b8 | 2005-10-30 14:59:54 -0800 | [diff] [blame] | 2337 | break; |
Srivatsa S. Bhat | 5302c3f | 2013-07-30 04:25:25 +0530 | [diff] [blame] | 2338 | |
Ashok Raj | c32b6b8 | 2005-10-30 14:59:54 -0800 | [diff] [blame] | 2339 | case CPU_DOWN_PREPARE: |
Viresh Kumar | 96bbbe4 | 2014-03-10 14:53:35 +0530 | [diff] [blame] | 2340 | __cpufreq_remove_dev_prepare(dev, NULL); |
Srivatsa S. Bhat | 1aee40a | 2013-09-07 01:23:27 +0530 | [diff] [blame] | 2341 | break; |
| 2342 | |
| 2343 | case CPU_POST_DEAD: |
Viresh Kumar | 96bbbe4 | 2014-03-10 14:53:35 +0530 | [diff] [blame] | 2344 | __cpufreq_remove_dev_finish(dev, NULL); |
Ashok Raj | c32b6b8 | 2005-10-30 14:59:54 -0800 | [diff] [blame] | 2345 | break; |
Srivatsa S. Bhat | 5302c3f | 2013-07-30 04:25:25 +0530 | [diff] [blame] | 2346 | |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 2347 | case CPU_DOWN_FAILED: |
Viresh Kumar | 96bbbe4 | 2014-03-10 14:53:35 +0530 | [diff] [blame] | 2348 | __cpufreq_add_dev(dev, NULL); |
Ashok Raj | c32b6b8 | 2005-10-30 14:59:54 -0800 | [diff] [blame] | 2349 | break; |
| 2350 | } |
| 2351 | } |
| 2352 | return NOTIFY_OK; |
| 2353 | } |
| 2354 | |
Neal Buckendahl | 9c36f74 | 2010-06-22 22:02:44 -0500 | [diff] [blame] | 2355 | static struct notifier_block __refdata cpufreq_cpu_notifier = { |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 2356 | .notifier_call = cpufreq_cpu_callback, |
Ashok Raj | c32b6b8 | 2005-10-30 14:59:54 -0800 | [diff] [blame] | 2357 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2358 | |
| 2359 | /********************************************************************* |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 2360 | * BOOST * |
| 2361 | *********************************************************************/ |
| 2362 | static int cpufreq_boost_set_sw(int state) |
| 2363 | { |
| 2364 | struct cpufreq_frequency_table *freq_table; |
| 2365 | struct cpufreq_policy *policy; |
| 2366 | int ret = -EINVAL; |
| 2367 | |
| 2368 | list_for_each_entry(policy, &cpufreq_policy_list, policy_list) { |
| 2369 | freq_table = cpufreq_frequency_get_table(policy->cpu); |
| 2370 | if (freq_table) { |
| 2371 | ret = cpufreq_frequency_table_cpuinfo(policy, |
| 2372 | freq_table); |
| 2373 | if (ret) { |
| 2374 | pr_err("%s: Policy frequency update failed\n", |
| 2375 | __func__); |
| 2376 | break; |
| 2377 | } |
| 2378 | policy->user_policy.max = policy->max; |
| 2379 | __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); |
| 2380 | } |
| 2381 | } |
| 2382 | |
| 2383 | return ret; |
| 2384 | } |
| 2385 | |
| 2386 | int cpufreq_boost_trigger_state(int state) |
| 2387 | { |
| 2388 | unsigned long flags; |
| 2389 | int ret = 0; |
| 2390 | |
| 2391 | if (cpufreq_driver->boost_enabled == state) |
| 2392 | return 0; |
| 2393 | |
| 2394 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
| 2395 | cpufreq_driver->boost_enabled = state; |
| 2396 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
| 2397 | |
| 2398 | ret = cpufreq_driver->set_boost(state); |
| 2399 | if (ret) { |
| 2400 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
| 2401 | cpufreq_driver->boost_enabled = !state; |
| 2402 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
| 2403 | |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 2404 | pr_err("%s: Cannot %s BOOST\n", |
| 2405 | __func__, state ? "enable" : "disable"); |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 2406 | } |
| 2407 | |
| 2408 | return ret; |
| 2409 | } |
| 2410 | |
| 2411 | int cpufreq_boost_supported(void) |
| 2412 | { |
| 2413 | if (likely(cpufreq_driver)) |
| 2414 | return cpufreq_driver->boost_supported; |
| 2415 | |
| 2416 | return 0; |
| 2417 | } |
| 2418 | EXPORT_SYMBOL_GPL(cpufreq_boost_supported); |
| 2419 | |
| 2420 | int cpufreq_boost_enabled(void) |
| 2421 | { |
| 2422 | return cpufreq_driver->boost_enabled; |
| 2423 | } |
| 2424 | EXPORT_SYMBOL_GPL(cpufreq_boost_enabled); |
| 2425 | |
| 2426 | /********************************************************************* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2427 | * REGISTER / UNREGISTER CPUFREQ DRIVER * |
| 2428 | *********************************************************************/ |
| 2429 | |
| 2430 | /** |
| 2431 | * cpufreq_register_driver - register a CPU Frequency driver |
| 2432 | * @driver_data: A struct cpufreq_driver containing the values# |
| 2433 | * submitted by the CPU Frequency driver. |
| 2434 | * |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 2435 | * Registers a CPU Frequency driver to this core code. This code |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2436 | * returns zero on success, -EBUSY when another driver got here first |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 2437 | * (and isn't unregistered in the meantime). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2438 | * |
| 2439 | */ |
Linus Torvalds | 221dee2 | 2007-02-26 14:55:48 -0800 | [diff] [blame] | 2440 | int cpufreq_register_driver(struct cpufreq_driver *driver_data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2441 | { |
| 2442 | unsigned long flags; |
| 2443 | int ret; |
| 2444 | |
Konrad Rzeszutek Wilk | a7b422c | 2012-03-13 19:18:39 -0400 | [diff] [blame] | 2445 | if (cpufreq_disabled()) |
| 2446 | return -ENODEV; |
| 2447 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2448 | if (!driver_data || !driver_data->verify || !driver_data->init || |
Viresh Kumar | 9c0ebcf | 2013-10-25 19:45:48 +0530 | [diff] [blame] | 2449 | !(driver_data->setpolicy || driver_data->target_index || |
Rafael J. Wysocki | 9832235 | 2014-03-19 12:48:30 +0100 | [diff] [blame] | 2450 | driver_data->target) || |
| 2451 | (driver_data->setpolicy && (driver_data->target_index || |
Viresh Kumar | 1c03a2d | 2014-06-02 22:49:28 +0530 | [diff] [blame] | 2452 | driver_data->target)) || |
| 2453 | (!!driver_data->get_intermediate != !!driver_data->target_intermediate)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2454 | return -EINVAL; |
| 2455 | |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 2456 | pr_debug("trying to register driver %s\n", driver_data->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2457 | |
| 2458 | if (driver_data->setpolicy) |
| 2459 | driver_data->flags |= CPUFREQ_CONST_LOOPS; |
| 2460 | |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 2461 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 2462 | if (cpufreq_driver) { |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 2463 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
Yinghai Lu | 4dea5806 | 2013-09-18 21:05:20 -0700 | [diff] [blame] | 2464 | return -EEXIST; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2465 | } |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 2466 | cpufreq_driver = driver_data; |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 2467 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2468 | |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 2469 | if (cpufreq_boost_supported()) { |
| 2470 | /* |
| 2471 | * Check if driver provides function to enable boost - |
| 2472 | * if not, use cpufreq_boost_set_sw as default |
| 2473 | */ |
| 2474 | if (!cpufreq_driver->set_boost) |
| 2475 | cpufreq_driver->set_boost = cpufreq_boost_set_sw; |
| 2476 | |
| 2477 | ret = cpufreq_sysfs_create_file(&boost.attr); |
| 2478 | if (ret) { |
| 2479 | pr_err("%s: cannot register global BOOST sysfs file\n", |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 2480 | __func__); |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 2481 | goto err_null_driver; |
| 2482 | } |
| 2483 | } |
| 2484 | |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 2485 | ret = subsys_interface_register(&cpufreq_interface); |
Jiri Slaby | 8f5bc2a | 2011-03-01 17:41:10 +0100 | [diff] [blame] | 2486 | if (ret) |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 2487 | goto err_boost_unreg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2488 | |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 2489 | if (!(cpufreq_driver->flags & CPUFREQ_STICKY)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2490 | int i; |
| 2491 | ret = -ENODEV; |
| 2492 | |
| 2493 | /* check for at least one working CPU */ |
Mike Travis | 7a6aedf | 2008-03-25 15:06:53 -0700 | [diff] [blame] | 2494 | for (i = 0; i < nr_cpu_ids; i++) |
| 2495 | if (cpu_possible(i) && per_cpu(cpufreq_cpu_data, i)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2496 | ret = 0; |
Mike Travis | 7a6aedf | 2008-03-25 15:06:53 -0700 | [diff] [blame] | 2497 | break; |
| 2498 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2499 | |
| 2500 | /* if all ->init() calls failed, unregister */ |
| 2501 | if (ret) { |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 2502 | pr_debug("no CPU initialized for driver %s\n", |
Joe Perches | e837f9b | 2014-03-11 10:03:00 -0700 | [diff] [blame] | 2503 | driver_data->name); |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 2504 | goto err_if_unreg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2505 | } |
| 2506 | } |
| 2507 | |
Jiri Slaby | 8f5bc2a | 2011-03-01 17:41:10 +0100 | [diff] [blame] | 2508 | register_hotcpu_notifier(&cpufreq_cpu_notifier); |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 2509 | pr_debug("driver %s up and running\n", driver_data->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2510 | |
Jiri Slaby | 8f5bc2a | 2011-03-01 17:41:10 +0100 | [diff] [blame] | 2511 | return 0; |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 2512 | err_if_unreg: |
| 2513 | subsys_interface_unregister(&cpufreq_interface); |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 2514 | err_boost_unreg: |
| 2515 | if (cpufreq_boost_supported()) |
| 2516 | cpufreq_sysfs_remove_file(&boost.attr); |
Jiri Slaby | 8f5bc2a | 2011-03-01 17:41:10 +0100 | [diff] [blame] | 2517 | err_null_driver: |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 2518 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 2519 | cpufreq_driver = NULL; |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 2520 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
Dave Jones | 4d34a67 | 2008-02-07 16:33:49 -0500 | [diff] [blame] | 2521 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2522 | } |
| 2523 | EXPORT_SYMBOL_GPL(cpufreq_register_driver); |
| 2524 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2525 | /** |
| 2526 | * cpufreq_unregister_driver - unregister the current CPUFreq driver |
| 2527 | * |
Viresh Kumar | bb176f7 | 2013-06-19 14:19:33 +0530 | [diff] [blame] | 2528 | * Unregister the current CPUFreq driver. Only call this if you have |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2529 | * the right to do so, i.e. if you have succeeded in initialising before! |
| 2530 | * Returns zero if successful, and -EINVAL if the cpufreq_driver is |
| 2531 | * currently not initialised. |
| 2532 | */ |
Linus Torvalds | 221dee2 | 2007-02-26 14:55:48 -0800 | [diff] [blame] | 2533 | int cpufreq_unregister_driver(struct cpufreq_driver *driver) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2534 | { |
| 2535 | unsigned long flags; |
| 2536 | |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 2537 | if (!cpufreq_driver || (driver != cpufreq_driver)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2538 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2539 | |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 2540 | pr_debug("unregistering driver %s\n", driver->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2541 | |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 2542 | subsys_interface_unregister(&cpufreq_interface); |
Lukasz Majewski | 6f19efc | 2013-12-20 15:24:49 +0100 | [diff] [blame] | 2543 | if (cpufreq_boost_supported()) |
| 2544 | cpufreq_sysfs_remove_file(&boost.attr); |
| 2545 | |
Chandra Seetharaman | 65edc68 | 2006-06-27 02:54:08 -0700 | [diff] [blame] | 2546 | unregister_hotcpu_notifier(&cpufreq_cpu_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2547 | |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 2548 | down_write(&cpufreq_rwsem); |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 2549 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 2550 | |
Rafael J. Wysocki | 1c3d85d | 2013-04-29 00:08:16 +0200 | [diff] [blame] | 2551 | cpufreq_driver = NULL; |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 2552 | |
Nathan Zimmer | 0d1857a | 2013-02-22 16:24:34 +0000 | [diff] [blame] | 2553 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
Viresh Kumar | 6eed940 | 2013-08-06 22:53:11 +0530 | [diff] [blame] | 2554 | up_write(&cpufreq_rwsem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2555 | |
| 2556 | return 0; |
| 2557 | } |
| 2558 | EXPORT_SYMBOL_GPL(cpufreq_unregister_driver); |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 2559 | |
Doug Anderson | 90de2a4 | 2014-12-23 22:09:48 -0800 | [diff] [blame^] | 2560 | /* |
| 2561 | * Stop cpufreq at shutdown to make sure it isn't holding any locks |
| 2562 | * or mutexes when secondary CPUs are halted. |
| 2563 | */ |
| 2564 | static struct syscore_ops cpufreq_syscore_ops = { |
| 2565 | .shutdown = cpufreq_suspend, |
| 2566 | }; |
| 2567 | |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 2568 | static int __init cpufreq_core_init(void) |
| 2569 | { |
Konrad Rzeszutek Wilk | a7b422c | 2012-03-13 19:18:39 -0400 | [diff] [blame] | 2570 | if (cpufreq_disabled()) |
| 2571 | return -ENODEV; |
| 2572 | |
Viresh Kumar | 2361be2 | 2013-05-17 16:09:09 +0530 | [diff] [blame] | 2573 | cpufreq_global_kobject = kobject_create(); |
Thomas Renninger | 8aa84ad | 2009-07-24 15:25:05 +0200 | [diff] [blame] | 2574 | BUG_ON(!cpufreq_global_kobject); |
| 2575 | |
Doug Anderson | 90de2a4 | 2014-12-23 22:09:48 -0800 | [diff] [blame^] | 2576 | register_syscore_ops(&cpufreq_syscore_ops); |
| 2577 | |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 2578 | return 0; |
| 2579 | } |
Venkatesh Pallipadi | 5a01f2e | 2007-02-05 16:12:44 -0800 | [diff] [blame] | 2580 | core_initcall(cpufreq_core_init); |