cpufreq.c (38fd2c202a3d82bc12430bce5789fa2c2a406f71) cpufreq.c (d3916691c90dfc9f08328d5cef8181e9ea508c55)
1/*
2 * linux/drivers/cpufreq/cpufreq.c
3 *
4 * Copyright (C) 2001 Russell King
5 * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
6 * (C) 2013 Viresh Kumar <viresh.kumar@linaro.org>
7 *
8 * Oct 2005 - Ashok Raj <ashok.raj@intel.com>

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34 * The "cpufreq driver" - the arch- or hardware-dependent low
35 * level driver of CPUFreq support, and its spinlock. This lock
36 * also protects the cpufreq_cpu_data array.
37 */
38static struct cpufreq_driver *cpufreq_driver;
39static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data);
40static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data_fallback);
41static DEFINE_RWLOCK(cpufreq_driver_lock);
1/*
2 * linux/drivers/cpufreq/cpufreq.c
3 *
4 * Copyright (C) 2001 Russell King
5 * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
6 * (C) 2013 Viresh Kumar <viresh.kumar@linaro.org>
7 *
8 * Oct 2005 - Ashok Raj <ashok.raj@intel.com>

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34 * The "cpufreq driver" - the arch- or hardware-dependent low
35 * level driver of CPUFreq support, and its spinlock. This lock
36 * also protects the cpufreq_cpu_data array.
37 */
38static struct cpufreq_driver *cpufreq_driver;
39static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data);
40static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data_fallback);
41static DEFINE_RWLOCK(cpufreq_driver_lock);
42static DEFINE_MUTEX(cpufreq_governor_lock);
42DEFINE_MUTEX(cpufreq_governor_lock);
43static LIST_HEAD(cpufreq_policy_list);
44
45#ifdef CONFIG_HOTPLUG_CPU
46/* This one keeps track of the previously set governor of a removed CPU */
47static DEFINE_PER_CPU(char[CPUFREQ_NAME_LEN], cpufreq_cpu_governor);
48#endif
49
50static inline bool has_target(void)

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315void cpufreq_notify_transition(struct cpufreq_policy *policy,
316 struct cpufreq_freqs *freqs, unsigned int state)
317{
318 for_each_cpu(freqs->cpu, policy->cpus)
319 __cpufreq_notify_transition(policy, freqs, state);
320}
321EXPORT_SYMBOL_GPL(cpufreq_notify_transition);
322
43static LIST_HEAD(cpufreq_policy_list);
44
45#ifdef CONFIG_HOTPLUG_CPU
46/* This one keeps track of the previously set governor of a removed CPU */
47static DEFINE_PER_CPU(char[CPUFREQ_NAME_LEN], cpufreq_cpu_governor);
48#endif
49
50static inline bool has_target(void)

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315void cpufreq_notify_transition(struct cpufreq_policy *policy,
316 struct cpufreq_freqs *freqs, unsigned int state)
317{
318 for_each_cpu(freqs->cpu, policy->cpus)
319 __cpufreq_notify_transition(policy, freqs, state);
320}
321EXPORT_SYMBOL_GPL(cpufreq_notify_transition);
322
323/* Do post notifications when there are chances that transition has failed */
324void cpufreq_notify_post_transition(struct cpufreq_policy *policy,
325 struct cpufreq_freqs *freqs, int transition_failed)
326{
327 cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE);
328 if (!transition_failed)
329 return;
323
330
331 swap(freqs->old, freqs->new);
332 cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE);
333 cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE);
334}
335EXPORT_SYMBOL_GPL(cpufreq_notify_post_transition);
336
337
324/*********************************************************************
325 * SYSFS INTERFACE *
326 *********************************************************************/
327
328static struct cpufreq_governor *__find_governor(const char *str_governor)
329{
330 struct cpufreq_governor *t;
331

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1054 if (cpufreq_driver->get) {
1055 policy->cur = cpufreq_driver->get(policy->cpu);
1056 if (!policy->cur) {
1057 pr_err("%s: ->get() failed\n", __func__);
1058 goto err_get_freq;
1059 }
1060 }
1061
338/*********************************************************************
339 * SYSFS INTERFACE *
340 *********************************************************************/
341
342static struct cpufreq_governor *__find_governor(const char *str_governor)
343{
344 struct cpufreq_governor *t;
345

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1068 if (cpufreq_driver->get) {
1069 policy->cur = cpufreq_driver->get(policy->cpu);
1070 if (!policy->cur) {
1071 pr_err("%s: ->get() failed\n", __func__);
1072 goto err_get_freq;
1073 }
1074 }
1075
1076 /*
1077 * Sometimes boot loaders set CPU frequency to a value outside of
1078 * frequency table present with cpufreq core. In such cases CPU might be
1079 * unstable if it has to run on that frequency for long duration of time
1080 * and so its better to set it to a frequency which is specified in
1081 * freq-table. This also makes cpufreq stats inconsistent as
1082 * cpufreq-stats would fail to register because current frequency of CPU
1083 * isn't found in freq-table.
1084 *
1085 * Because we don't want this change to effect boot process badly, we go
1086 * for the next freq which is >= policy->cur ('cur' must be set by now,
1087 * otherwise we will end up setting freq to lowest of the table as 'cur'
1088 * is initialized to zero).
1089 *
1090 * We are passing target-freq as "policy->cur - 1" otherwise
1091 * __cpufreq_driver_target() would simply fail, as policy->cur will be
1092 * equal to target-freq.
1093 */
1094 if ((cpufreq_driver->flags & CPUFREQ_NEED_INITIAL_FREQ_CHECK)
1095 && has_target()) {
1096 /* Are we running at unknown frequency ? */
1097 ret = cpufreq_frequency_table_get_index(policy, policy->cur);
1098 if (ret == -EINVAL) {
1099 /* Warn user and fix it */
1100 pr_warn("%s: CPU%d: Running at unlisted freq: %u KHz\n",
1101 __func__, policy->cpu, policy->cur);
1102 ret = __cpufreq_driver_target(policy, policy->cur - 1,
1103 CPUFREQ_RELATION_L);
1104
1105 /*
1106 * Reaching here after boot in a few seconds may not
1107 * mean that system will remain stable at "unknown"
1108 * frequency for longer duration. Hence, a BUG_ON().
1109 */
1110 BUG_ON(ret);
1111 pr_warn("%s: CPU%d: Unlisted initial frequency changed to: %u KHz\n",
1112 __func__, policy->cpu, policy->cur);
1113 }
1114 }
1115
1062 /* related cpus should atleast have policy->cpus */
1063 cpumask_or(policy->related_cpus, policy->related_cpus, policy->cpus);
1064
1065 /*
1066 * affected cpus must always be the one, which are online. We aren't
1067 * managing offline cpus here.
1068 */
1069 cpumask_and(policy->cpus, policy->cpus, cpu_online_mask);

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1720 CPUFREQ_PRECHANGE);
1721 }
1722
1723 retval = cpufreq_driver->target_index(policy, index);
1724 if (retval)
1725 pr_err("%s: Failed to change cpu frequency: %d\n",
1726 __func__, retval);
1727
1116 /* related cpus should atleast have policy->cpus */
1117 cpumask_or(policy->related_cpus, policy->related_cpus, policy->cpus);
1118
1119 /*
1120 * affected cpus must always be the one, which are online. We aren't
1121 * managing offline cpus here.
1122 */
1123 cpumask_and(policy->cpus, policy->cpus, cpu_online_mask);

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1774 CPUFREQ_PRECHANGE);
1775 }
1776
1777 retval = cpufreq_driver->target_index(policy, index);
1778 if (retval)
1779 pr_err("%s: Failed to change cpu frequency: %d\n",
1780 __func__, retval);
1781
1728 if (notify) {
1729 /*
1730 * Notify with old freq in case we failed to change
1731 * frequency
1732 */
1733 if (retval)
1734 freqs.new = freqs.old;
1735
1736 cpufreq_notify_transition(policy, &freqs,
1737 CPUFREQ_POSTCHANGE);
1738 }
1782 if (notify)
1783 cpufreq_notify_post_transition(policy, &freqs, retval);
1739 }
1740
1741out:
1742 return retval;
1743}
1744EXPORT_SYMBOL_GPL(__cpufreq_driver_target);
1745
1746int cpufreq_driver_target(struct cpufreq_policy *policy,

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1785
1786out:
1787 return retval;
1788}
1789EXPORT_SYMBOL_GPL(__cpufreq_driver_target);
1790
1791int cpufreq_driver_target(struct cpufreq_policy *policy,

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