diff options
Diffstat (limited to 'drivers/cpufreq/cpufreq.c')
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 1142 |
1 files changed, 744 insertions, 398 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 43c24aa756f..6f024852c6f 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -26,7 +26,7 @@ #include <linux/module.h> #include <linux/mutex.h> #include <linux/slab.h> -#include <linux/syscore_ops.h> +#include <linux/suspend.h> #include <linux/tick.h> #include <trace/events/power.h> @@ -39,57 +39,20 @@ static struct cpufreq_driver *cpufreq_driver; static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data); static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data_fallback); static DEFINE_RWLOCK(cpufreq_driver_lock); -static DEFINE_MUTEX(cpufreq_governor_lock); +DEFINE_MUTEX(cpufreq_governor_lock); static LIST_HEAD(cpufreq_policy_list); -#ifdef CONFIG_HOTPLUG_CPU /* This one keeps track of the previously set governor of a removed CPU */ static DEFINE_PER_CPU(char[CPUFREQ_NAME_LEN], cpufreq_cpu_governor); -#endif -/* - * cpu_policy_rwsem is a per CPU reader-writer semaphore designed to cure - * all cpufreq/hotplug/workqueue/etc related lock issues. - * - * The rules for this semaphore: - * - Any routine that wants to read from the policy structure will - * do a down_read on this semaphore. - * - Any routine that will write to the policy structure and/or may take away - * the policy altogether (eg. CPU hotplug), will hold this lock in write - * mode before doing so. - * - * Additional rules: - * - Governor routines that can be called in cpufreq hotplug path should not - * take this sem as top level hotplug notifier handler takes this. - * - Lock should not be held across - * __cpufreq_governor(data, CPUFREQ_GOV_STOP); - */ -static DEFINE_PER_CPU(struct rw_semaphore, cpu_policy_rwsem); +/* Flag to suspend/resume CPUFreq governors */ +static bool cpufreq_suspended; -#define lock_policy_rwsem(mode, cpu) \ -static int lock_policy_rwsem_##mode(int cpu) \ -{ \ - struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); \ - BUG_ON(!policy); \ - down_##mode(&per_cpu(cpu_policy_rwsem, policy->cpu)); \ - \ - return 0; \ -} - -lock_policy_rwsem(read, cpu); -lock_policy_rwsem(write, cpu); - -#define unlock_policy_rwsem(mode, cpu) \ -static void unlock_policy_rwsem_##mode(int cpu) \ -{ \ - struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); \ - BUG_ON(!policy); \ - up_##mode(&per_cpu(cpu_policy_rwsem, policy->cpu)); \ +static inline bool has_target(void) +{ + return cpufreq_driver->target_index || cpufreq_driver->target; } -unlock_policy_rwsem(read, cpu); -unlock_policy_rwsem(write, cpu); - /* * rwsem to guarantee that cpufreq driver module doesn't unload during critical * sections @@ -135,7 +98,7 @@ static DEFINE_MUTEX(cpufreq_governor_mutex); bool have_governor_per_policy(void) { - return cpufreq_driver->have_governor_per_policy; + return !!(cpufreq_driver->flags & CPUFREQ_HAVE_GOVERNOR_PER_POLICY); } EXPORT_SYMBOL_GPL(have_governor_per_policy); @@ -183,6 +146,57 @@ u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy) } EXPORT_SYMBOL_GPL(get_cpu_idle_time); +/* + * This is a generic cpufreq init() routine which can be used by cpufreq + * drivers of SMP systems. It will do following: + * - validate & show freq table passed + * - set policies transition latency + * - policy->cpus with all possible CPUs + */ +int cpufreq_generic_init(struct cpufreq_policy *policy, + struct cpufreq_frequency_table *table, + unsigned int transition_latency) +{ + int ret; + + ret = cpufreq_table_validate_and_show(policy, table); + if (ret) { + pr_err("%s: invalid frequency table: %d\n", __func__, ret); + return ret; + } + + policy->cpuinfo.transition_latency = transition_latency; + + /* + * The driver only supports the SMP configuartion where all processors + * share the clock and voltage and clock. + */ + cpumask_setall(policy->cpus); + + return 0; +} +EXPORT_SYMBOL_GPL(cpufreq_generic_init); + +unsigned int cpufreq_generic_get(unsigned int cpu) +{ + struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); + + if (!policy || IS_ERR(policy->clk)) { + pr_err("%s: No %s associated to cpu: %d\n", + __func__, policy ? "clk" : "policy", cpu); + return 0; + } + + return clk_get_rate(policy->clk) / 1000; +} +EXPORT_SYMBOL_GPL(cpufreq_generic_get); + +/* Only for cpufreq core internal use */ +struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu) +{ + return per_cpu(cpufreq_cpu_data, cpu); +} + struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu) { struct cpufreq_policy *policy = NULL; @@ -247,15 +261,14 @@ static void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci) if (!l_p_j_ref_freq) { l_p_j_ref = loops_per_jiffy; l_p_j_ref_freq = ci->old; - pr_debug("saving %lu as reference value for loops_per_jiffy; " - "freq is %u kHz\n", l_p_j_ref, l_p_j_ref_freq); + pr_debug("saving %lu as reference value for loops_per_jiffy; freq is %u kHz\n", + l_p_j_ref, l_p_j_ref_freq); } - if ((val == CPUFREQ_POSTCHANGE && ci->old != ci->new) || - (val == CPUFREQ_RESUMECHANGE || val == CPUFREQ_SUSPENDCHANGE)) { + if (val == CPUFREQ_POSTCHANGE && ci->old != ci->new) { loops_per_jiffy = cpufreq_scale(l_p_j_ref, l_p_j_ref_freq, ci->new); - pr_debug("scaling loops_per_jiffy to %lu " - "for frequency %u kHz\n", loops_per_jiffy, ci->new); + pr_debug("scaling loops_per_jiffy to %lu for frequency %u kHz\n", + loops_per_jiffy, ci->new); } } #else @@ -275,7 +288,7 @@ static void __cpufreq_notify_transition(struct cpufreq_policy *policy, freqs->flags = cpufreq_driver->flags; pr_debug("notification %u of frequency transition to %u kHz\n", - state, freqs->new); + state, freqs->new); switch (state) { @@ -287,9 +300,8 @@ static void __cpufreq_notify_transition(struct cpufreq_policy *policy, if (!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) { if ((policy) && (policy->cpu == freqs->cpu) && (policy->cur) && (policy->cur != freqs->old)) { - pr_debug("Warning: CPU frequency is" - " %u, cpufreq assumed %u kHz.\n", - freqs->old, policy->cur); + pr_debug("Warning: CPU frequency is %u, cpufreq assumed %u kHz\n", + freqs->old, policy->cur); freqs->old = policy->cur; } } @@ -300,8 +312,8 @@ static void __cpufreq_notify_transition(struct cpufreq_policy *policy, case CPUFREQ_POSTCHANGE: adjust_jiffies(CPUFREQ_POSTCHANGE, freqs); - pr_debug("FREQ: %lu - CPU: %lu", (unsigned long)freqs->new, - (unsigned long)freqs->cpu); + pr_debug("FREQ: %lu - CPU: %lu\n", + (unsigned long)freqs->new, (unsigned long)freqs->cpu); trace_cpu_frequency(freqs->new, freqs->cpu); srcu_notifier_call_chain(&cpufreq_transition_notifier_list, CPUFREQ_POSTCHANGE, freqs); @@ -319,18 +331,106 @@ static void __cpufreq_notify_transition(struct cpufreq_policy *policy, * function. It is called twice on all CPU frequency changes that have * external effects. */ -void cpufreq_notify_transition(struct cpufreq_policy *policy, +static void cpufreq_notify_transition(struct cpufreq_policy *policy, struct cpufreq_freqs *freqs, unsigned int state) { for_each_cpu(freqs->cpu, policy->cpus) __cpufreq_notify_transition(policy, freqs, state); } -EXPORT_SYMBOL_GPL(cpufreq_notify_transition); + +/* Do post notifications when there are chances that transition has failed */ +static void cpufreq_notify_post_transition(struct cpufreq_policy *policy, + struct cpufreq_freqs *freqs, int transition_failed) +{ + cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE); + if (!transition_failed) + return; + + swap(freqs->old, freqs->new); + cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE); + cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE); +} + +void cpufreq_freq_transition_begin(struct cpufreq_policy *policy, + struct cpufreq_freqs *freqs) +{ + + /* + * Catch double invocations of _begin() which lead to self-deadlock. + * ASYNC_NOTIFICATION drivers are left out because the cpufreq core + * doesn't invoke _begin() on their behalf, and hence the chances of + * double invocations are very low. Moreover, there are scenarios + * where these checks can emit false-positive warnings in these + * drivers; so we avoid that by skipping them altogether. + */ + WARN_ON(!(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION) + && current == policy->transition_task); + +wait: + wait_event(policy->transition_wait, !policy->transition_ongoing); + + spin_lock(&policy->transition_lock); + + if (unlikely(policy->transition_ongoing)) { + spin_unlock(&policy->transition_lock); + goto wait; + } + + policy->transition_ongoing = true; + policy->transition_task = current; + + spin_unlock(&policy->transition_lock); + + cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE); +} +EXPORT_SYMBOL_GPL(cpufreq_freq_transition_begin); + +void cpufreq_freq_transition_end(struct cpufreq_policy *policy, + struct cpufreq_freqs *freqs, int transition_failed) +{ + if (unlikely(WARN_ON(!policy->transition_ongoing))) + return; + + cpufreq_notify_post_transition(policy, freqs, transition_failed); + + policy->transition_ongoing = false; + policy->transition_task = NULL; + + wake_up(&policy->transition_wait); +} +EXPORT_SYMBOL_GPL(cpufreq_freq_transition_end); /********************************************************************* * SYSFS INTERFACE * *********************************************************************/ +static ssize_t show_boost(struct kobject *kobj, + struct attribute *attr, char *buf) +{ + return sprintf(buf, "%d\n", cpufreq_driver->boost_enabled); +} + +static ssize_t store_boost(struct kobject *kobj, struct attribute *attr, + const char *buf, size_t count) +{ + int ret, enable; + + ret = sscanf(buf, "%d", &enable); + if (ret != 1 || enable < 0 || enable > 1) + return -EINVAL; + + if (cpufreq_boost_trigger_state(enable)) { + pr_err("%s: Cannot %s BOOST!\n", + __func__, enable ? "enable" : "disable"); + return -EINVAL; + } + + pr_debug("%s: cpufreq BOOST %s\n", + __func__, enable ? "enabled" : "disabled"); + + return count; +} +define_one_global_rw(boost); static struct cpufreq_governor *__find_governor(const char *str_governor) { @@ -363,7 +463,7 @@ static int cpufreq_parse_governor(char *str_governor, unsigned int *policy, *policy = CPUFREQ_POLICY_POWERSAVE; err = 0; } - } else if (cpufreq_driver->target) { + } else if (has_target()) { struct cpufreq_governor *t; mutex_lock(&cpufreq_governor_mutex); @@ -414,7 +514,7 @@ show_one(scaling_min_freq, min); show_one(scaling_max_freq, max); show_one(scaling_cur_freq, cur); -static int __cpufreq_set_policy(struct cpufreq_policy *policy, +static int cpufreq_set_policy(struct cpufreq_policy *policy, struct cpufreq_policy *new_policy); /** @@ -435,7 +535,7 @@ static ssize_t store_##file_name \ if (ret != 1) \ return -EINVAL; \ \ - ret = __cpufreq_set_policy(policy, &new_policy); \ + ret = cpufreq_set_policy(policy, &new_policy); \ policy->user_policy.object = policy->object; \ \ return ret ? ret : count; \ @@ -493,11 +593,7 @@ static ssize_t store_scaling_governor(struct cpufreq_policy *policy, &new_policy.governor)) return -EINVAL; - /* - * Do not use cpufreq_set_policy here or the user_policy.max - * will be wrongly overridden - */ - ret = __cpufreq_set_policy(policy, &new_policy); + ret = cpufreq_set_policy(policy, &new_policy); policy->user_policy.policy = policy->policy; policy->user_policy.governor = policy->governor; @@ -525,7 +621,7 @@ static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy, ssize_t i = 0; struct cpufreq_governor *t; - if (!cpufreq_driver->target) { + if (!has_target()) { i += sprintf(buf, "performance powersave"); goto out; } @@ -653,24 +749,21 @@ static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf) { struct cpufreq_policy *policy = to_policy(kobj); struct freq_attr *fattr = to_attr(attr); - ssize_t ret = -EINVAL; + ssize_t ret; if (!down_read_trylock(&cpufreq_rwsem)) - goto exit; + return -EINVAL; - if (lock_policy_rwsem_read(policy->cpu) < 0) - goto up_read; + down_read(&policy->rwsem); if (fattr->show) ret = fattr->show(policy, buf); else ret = -EIO; - unlock_policy_rwsem_read(policy->cpu); - -up_read: + up_read(&policy->rwsem); up_read(&cpufreq_rwsem); -exit: + return ret; } @@ -689,17 +782,15 @@ static ssize_t store(struct kobject *kobj, struct attribute *attr, if (!down_read_trylock(&cpufreq_rwsem)) goto unlock; - if (lock_policy_rwsem_write(policy->cpu) < 0) - goto up_read; + down_write(&policy->rwsem); if (fattr->store) ret = fattr->store(policy, buf, count); else ret = -EIO; - unlock_policy_rwsem_write(policy->cpu); + up_write(&policy->rwsem); -up_read: up_read(&cpufreq_rwsem); unlock: put_online_cpus(); @@ -815,7 +906,7 @@ static int cpufreq_add_dev_interface(struct cpufreq_policy *policy, if (ret) goto err_out_kobj_put; } - if (cpufreq_driver->target) { + if (has_target()) { ret = sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr); if (ret) goto err_out_kobj_put; @@ -840,18 +931,28 @@ err_out_kobj_put: static void cpufreq_init_policy(struct cpufreq_policy *policy) { + struct cpufreq_governor *gov = NULL; struct cpufreq_policy new_policy; int ret = 0; memcpy(&new_policy, policy, sizeof(*policy)); - /* assure that the starting sequence is run in __cpufreq_set_policy */ - policy->governor = NULL; - /* set default policy */ - ret = __cpufreq_set_policy(policy, &new_policy); - policy->user_policy.policy = policy->policy; - policy->user_policy.governor = policy->governor; + /* Update governor of new_policy to the governor used before hotplug */ + gov = __find_governor(per_cpu(cpufreq_cpu_governor, policy->cpu)); + if (gov) + pr_debug("Restoring governor %s for cpu %d\n", + policy->governor->name, policy->cpu); + else + gov = CPUFREQ_DEFAULT_GOVERNOR; + new_policy.governor = gov; + + /* Use the default policy if its valid. */ + if (cpufreq_driver->setpolicy) + cpufreq_parse_governor(gov->name, &new_policy.policy, NULL); + + /* set default policy */ + ret = cpufreq_set_policy(policy, &new_policy); if (ret) { pr_debug("setting policy failed\n"); if (cpufreq_driver->exit) @@ -861,13 +962,12 @@ static void cpufreq_init_policy(struct cpufreq_policy *policy) #ifdef CONFIG_HOTPLUG_CPU static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, - unsigned int cpu, struct device *dev, - bool frozen) + unsigned int cpu, struct device *dev) { - int ret = 0, has_target = !!cpufreq_driver->target; + int ret = 0; unsigned long flags; - if (has_target) { + if (has_target()) { ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP); if (ret) { pr_err("%s: Failed to stop governor\n", __func__); @@ -875,7 +975,7 @@ static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, } } - lock_policy_rwsem_write(policy->cpu); + down_write(&policy->rwsem); write_lock_irqsave(&cpufreq_driver_lock, flags); @@ -883,21 +983,20 @@ static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, per_cpu(cpufreq_cpu_data, cpu) = policy; write_unlock_irqrestore(&cpufreq_driver_lock, flags); - unlock_policy_rwsem_write(policy->cpu); + up_write(&policy->rwsem); + + if (has_target()) { + ret = __cpufreq_governor(policy, CPUFREQ_GOV_START); + if (!ret) + ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); - if (has_target) { - if ((ret = __cpufreq_governor(policy, CPUFREQ_GOV_START)) || - (ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS))) { + if (ret) { pr_err("%s: Failed to start governor\n", __func__); return ret; } } - /* Don't touch sysfs links during light-weight init */ - if (!frozen) - ret = sysfs_create_link(&dev->kobj, &policy->kobj, "cpufreq"); - - return ret; + return sysfs_create_link(&dev->kobj, &policy->kobj, "cpufreq"); } #endif @@ -912,6 +1011,8 @@ static struct cpufreq_policy *cpufreq_policy_restore(unsigned int cpu) read_unlock_irqrestore(&cpufreq_driver_lock, flags); + policy->governor = NULL; + return policy; } @@ -930,6 +1031,10 @@ static struct cpufreq_policy *cpufreq_policy_alloc(void) goto err_free_cpumask; INIT_LIST_HEAD(&policy->policy_list); + init_rwsem(&policy->rwsem); + spin_lock_init(&policy->transition_lock); + init_waitqueue_head(&policy->transition_wait); + return policy; err_free_cpumask: @@ -940,6 +1045,30 @@ err_free_policy: return NULL; } +static void cpufreq_policy_put_kobj(struct cpufreq_policy *policy) +{ + struct kobject *kobj; + struct completion *cmp; + + blocking_notifier_call_chain(&cpufreq_policy_notifier_list, + CPUFREQ_REMOVE_POLICY, policy); + + down_read(&policy->rwsem); + kobj = &policy->kobj; + cmp = &policy->kobj_unregister; + up_read(&policy->rwsem); + kobject_put(kobj); + + /* + * We need to make sure that the underlying kobj is + * actually not referenced anymore by anybody before we + * proceed with unloading. + */ + pr_debug("waiting for dropping of refcount\n"); + wait_for_completion(cmp); + pr_debug("wait complete\n"); +} + static void cpufreq_policy_free(struct cpufreq_policy *policy) { free_cpumask_var(policy->related_cpus); @@ -949,29 +1078,29 @@ static void cpufreq_policy_free(struct cpufreq_policy *policy) static void update_policy_cpu(struct cpufreq_policy *policy, unsigned int cpu) { - if (cpu == policy->cpu) + if (WARN_ON(cpu == policy->cpu)) return; + down_write(&policy->rwsem); + policy->last_cpu = policy->cpu; policy->cpu = cpu; -#ifdef CONFIG_CPU_FREQ_TABLE - cpufreq_frequency_table_update_policy_cpu(policy); -#endif + up_write(&policy->rwsem); + blocking_notifier_call_chain(&cpufreq_policy_notifier_list, CPUFREQ_UPDATE_POLICY_CPU, policy); } -static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif, - bool frozen) +static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) { unsigned int j, cpu = dev->id; int ret = -ENOMEM; struct cpufreq_policy *policy; unsigned long flags; + bool recover_policy = cpufreq_suspended; #ifdef CONFIG_HOTPLUG_CPU struct cpufreq_policy *tpolicy; - struct cpufreq_governor *gov; #endif if (cpu_is_offline(cpu)) @@ -998,7 +1127,7 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif, list_for_each_entry(tpolicy, &cpufreq_policy_list, policy_list) { if (cpumask_test_cpu(cpu, tpolicy->related_cpus)) { read_unlock_irqrestore(&cpufreq_driver_lock, flags); - ret = cpufreq_add_policy_cpu(tpolicy, cpu, dev, frozen); + ret = cpufreq_add_policy_cpu(tpolicy, cpu, dev); up_read(&cpufreq_rwsem); return ret; } @@ -1006,15 +1135,17 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif, read_unlock_irqrestore(&cpufreq_driver_lock, flags); #endif - if (frozen) - /* Restore the saved policy when doing light-weight init */ - policy = cpufreq_policy_restore(cpu); - else + /* + * Restore the saved policy when doing light-weight init and fall back + * to the full init if that fails. + */ + policy = recover_policy ? cpufreq_policy_restore(cpu) : NULL; + if (!policy) { + recover_policy = false; policy = cpufreq_policy_alloc(); - - if (!policy) - goto nomem_out; - + if (!policy) + goto nomem_out; + } /* * In the resume path, since we restore a saved policy, the assignment @@ -1022,12 +1153,13 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif, * the creation of a brand new one. So we need to perform this update * by invoking update_policy_cpu(). */ - if (frozen && cpu != policy->cpu) + if (recover_policy && cpu != policy->cpu) { update_policy_cpu(policy, cpu); - else + WARN_ON(kobject_move(&policy->kobj, &dev->kobj)); + } else { policy->cpu = cpu; + } - policy->governor = CPUFREQ_DEFAULT_GOVERNOR; cpumask_copy(policy->cpus, cpumask_of(cpu)); init_completion(&policy->kobj_unregister); @@ -1051,30 +1183,74 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif, */ cpumask_and(policy->cpus, policy->cpus, cpu_online_mask); - policy->user_policy.min = policy->min; - policy->user_policy.max = policy->max; - - blocking_notifier_call_chain(&cpufreq_policy_notifier_list, - CPUFREQ_START, policy); - -#ifdef CONFIG_HOTPLUG_CPU - gov = __find_governor(per_cpu(cpufreq_cpu_governor, cpu)); - if (gov) { - policy->governor = gov; - pr_debug("Restoring governor %s for cpu %d\n", - policy->governor->name, cpu); + if (!recover_policy) { + policy->user_policy.min = policy->min; + policy->user_policy.max = policy->max; } -#endif + down_write(&policy->rwsem); write_lock_irqsave(&cpufreq_driver_lock, flags); for_each_cpu(j, policy->cpus) per_cpu(cpufreq_cpu_data, j) = policy; write_unlock_irqrestore(&cpufreq_driver_lock, flags); - if (!frozen) { + if (cpufreq_driver->get && !cpufreq_driver->setpolicy) { + policy->cur = cpufreq_driver->get(policy->cpu); + if (!policy->cur) { + pr_err("%s: ->get() failed\n", __func__); + goto err_get_freq; + } + } + + /* + * Sometimes boot loaders set CPU frequency to a value outside of + * frequency table present with cpufreq core. In such cases CPU might be + * unstable if it has to run on that frequency for long duration of time + * and so its better to set it to a frequency which is specified in + * freq-table. This also makes cpufreq stats inconsistent as + * cpufreq-stats would fail to register because current frequency of CPU + * isn't found in freq-table. + * + * Because we don't want this change to effect boot process badly, we go + * for the next freq which is >= policy->cur ('cur' must be set by now, + * otherwise we will end up setting freq to lowest of the table as 'cur' + * is initialized to zero). + * + * We are passing target-freq as "policy->cur - 1" otherwise + * __cpufreq_driver_target() would simply fail, as policy->cur will be + * equal to target-freq. + */ + if ((cpufreq_driver->flags & CPUFREQ_NEED_INITIAL_FREQ_CHECK) + && has_target()) { + /* Are we running at unknown frequency ? */ + ret = cpufreq_frequency_table_get_index(policy, policy->cur); + if (ret == -EINVAL) { + /* Warn user and fix it */ + pr_warn("%s: CPU%d: Running at unlisted freq: %u KHz\n", + __func__, policy->cpu, policy->cur); + ret = __cpufreq_driver_target(policy, policy->cur - 1, + CPUFREQ_RELATION_L); + + /* + * Reaching here after boot in a few seconds may not + * mean that system will remain stable at "unknown" + * frequency for longer duration. Hence, a BUG_ON(). + */ + BUG_ON(ret); + pr_warn("%s: CPU%d: Unlisted initial frequency changed to: %u KHz\n", + __func__, policy->cpu, policy->cur); + } + } + + blocking_notifier_call_chain(&cpufreq_policy_notifier_list, + CPUFREQ_START, policy); + + if (!recover_policy) { ret = cpufreq_add_dev_interface(policy, dev); if (ret) goto err_out_unregister; + blocking_notifier_call_chain(&cpufreq_policy_notifier_list, + CPUFREQ_CREATE_POLICY, policy); } write_lock_irqsave(&cpufreq_driver_lock, flags); @@ -1083,6 +1259,12 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif, cpufreq_init_policy(policy); + if (!recover_policy) { + policy->user_policy.policy = policy->policy; + policy->user_policy.governor = policy->governor; + } + up_write(&policy->rwsem); + kobject_uevent(&policy->kobj, KOBJ_ADD); up_read(&cpufreq_rwsem); @@ -1091,13 +1273,22 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif, return 0; err_out_unregister: +err_get_freq: write_lock_irqsave(&cpufreq_driver_lock, flags); for_each_cpu(j, policy->cpus) per_cpu(cpufreq_cpu_data, j) = NULL; write_unlock_irqrestore(&cpufreq_driver_lock, flags); + if (cpufreq_driver->exit) + cpufreq_driver->exit(policy); err_set_policy_cpu: + if (recover_policy) { + /* Do not leave stale fallback data behind. */ + per_cpu(cpufreq_cpu_data_fallback, cpu) = NULL; + cpufreq_policy_put_kobj(policy); + } cpufreq_policy_free(policy); + nomem_out: up_read(&cpufreq_rwsem); @@ -1115,30 +1306,26 @@ nomem_out: */ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) { - return __cpufreq_add_dev(dev, sif, false); + return __cpufreq_add_dev(dev, sif); } static int cpufreq_nominate_new_policy_cpu(struct cpufreq_policy *policy, - unsigned int old_cpu, bool frozen) + unsigned int old_cpu) { struct device *cpu_dev; int ret; /* first sibling now owns the new sysfs dir */ - cpu_dev = get_cpu_device(cpumask_first(policy->cpus)); - - /* Don't touch sysfs files during light-weight tear-down */ - if (frozen) - return cpu_dev->id; + cpu_dev = get_cpu_device(cpumask_any_but(policy->cpus, old_cpu)); sysfs_remove_link(&cpu_dev->kobj, "cpufreq"); ret = kobject_move(&policy->kobj, &cpu_dev->kobj); if (ret) { - pr_err("%s: Failed to move kobj: %d", __func__, ret); + pr_err("%s: Failed to move kobj: %d\n", __func__, ret); - WARN_ON(lock_policy_rwsem_write(old_cpu)); + down_write(&policy->rwsem); cpumask_set_cpu(old_cpu, policy->cpus); - unlock_policy_rwsem_write(old_cpu); + up_write(&policy->rwsem); ret = sysfs_create_link(&cpu_dev->kobj, &policy->kobj, "cpufreq"); @@ -1150,8 +1337,7 @@ static int cpufreq_nominate_new_policy_cpu(struct cpufreq_policy *policy, } static int __cpufreq_remove_dev_prepare(struct device *dev, - struct subsys_interface *sif, - bool frozen) + struct subsys_interface *sif) { unsigned int cpu = dev->id, cpus; int new_cpu, ret; @@ -1165,7 +1351,7 @@ static int __cpufreq_remove_dev_prepare(struct device *dev, policy = per_cpu(cpufreq_cpu_data, cpu); /* Save the policy somewhere when doing a light-weight tear-down */ - if (frozen) + if (cpufreq_suspended) per_cpu(cpufreq_cpu_data_fallback, cpu) = policy; write_unlock_irqrestore(&cpufreq_driver_lock, flags); @@ -1175,7 +1361,7 @@ static int __cpufreq_remove_dev_prepare(struct device *dev, return -EINVAL; } - if (cpufreq_driver->target) { + if (has_target()) { ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP); if (ret) { pr_err("%s: Failed to stop governor\n", __func__); @@ -1183,50 +1369,39 @@ static int __cpufreq_remove_dev_prepare(struct device *dev, } } -#ifdef CONFIG_HOTPLUG_CPU if (!cpufreq_driver->setpolicy) strncpy(per_cpu(cpufreq_cpu_governor, cpu), policy->governor->name, CPUFREQ_NAME_LEN); -#endif - WARN_ON(lock_policy_rwsem_write(cpu)); + down_read(&policy->rwsem); cpus = cpumask_weight(policy->cpus); - - if (cpus > 1) - cpumask_clear_cpu(cpu, policy->cpus); - unlock_policy_rwsem_write(cpu); + up_read(&policy->rwsem); if (cpu != policy->cpu) { - if (!frozen) - sysfs_remove_link(&dev->kobj, "cpufreq"); + sysfs_remove_link(&dev->kobj, "cpufreq"); } else if (cpus > 1) { - - new_cpu = cpufreq_nominate_new_policy_cpu(policy, cpu, frozen); + new_cpu = cpufreq_nominate_new_policy_cpu(policy, cpu); if (new_cpu >= 0) { - WARN_ON(lock_policy_rwsem_write(cpu)); update_policy_cpu(policy, new_cpu); - unlock_policy_rwsem_write(cpu); - if (!frozen) { - pr_debug("%s: policy Kobject moved to cpu: %d " - "from: %d\n",__func__, new_cpu, cpu); - } + if (!cpufreq_suspended) + pr_debug("%s: policy Kobject moved to cpu: %d from: %d\n", + __func__, new_cpu, cpu); } + } else if (cpufreq_driver->stop_cpu && cpufreq_driver->setpolicy) { + cpufreq_driver->stop_cpu(policy); } return 0; } static int __cpufreq_remove_dev_finish(struct device *dev, - struct subsys_interface *sif, - bool frozen) + struct subsys_interface *sif) { unsigned int cpu = dev->id, cpus; int ret; unsigned long flags; struct cpufreq_policy *policy; - struct kobject *kobj; - struct completion *cmp; read_lock_irqsave(&cpufreq_driver_lock, flags); policy = per_cpu(cpufreq_cpu_data, cpu); @@ -1237,38 +1412,27 @@ static int __cpufreq_remove_dev_finish(struct device *dev, return -EINVAL; } - lock_policy_rwsem_read(cpu); + down_write(&policy->rwsem); cpus = cpumask_weight(policy->cpus); - unlock_policy_rwsem_read(cpu); + + if (cpus > 1) + cpumask_clear_cpu(cpu, policy->cpus); + up_write(&policy->rwsem); /* If cpu is last user of policy, free policy */ if (cpus == 1) { - if (cpufreq_driver->target) { + if (has_target()) { ret = __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); if (ret) { pr_err("%s: Failed to exit governor\n", - __func__); + __func__); return ret; } } - if (!frozen) { - lock_policy_rwsem_read(cpu); - kobj = &policy->kobj; - cmp = &policy->kobj_unregister; - unlock_policy_rwsem_read(cpu); - kobject_put(kobj); - - /* - * We need to make sure that the underlying kobj is - * actually not referenced anymore by anybody before we - * proceed with unloading. - */ - pr_debug("waiting for dropping of refcount\n"); - wait_for_completion(cmp); - pr_debug("wait complete\n"); - } + if (!cpufreq_suspended) + cpufreq_policy_put_kobj(policy); /* * Perform the ->exit() even during light-weight tear-down, @@ -1283,16 +1447,16 @@ static int __cpufreq_remove_dev_finish(struct device *dev, list_del(&policy->policy_list); write_unlock_irqrestore(&cpufreq_driver_lock, flags); - if (!frozen) + if (!cpufreq_suspended) cpufreq_policy_free(policy); - } else { - if (cpufreq_driver->target) { - if ((ret = __cpufreq_governor(policy, CPUFREQ_GOV_START)) || - (ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS))) { - pr_err("%s: Failed to start governor\n", - __func__); - return ret; - } + } else if (has_target()) { + ret = __cpufreq_governor(policy, CPUFREQ_GOV_START); + if (!ret) + ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); + + if (ret) { + pr_err("%s: Failed to start governor\n", __func__); + return ret; } } @@ -1301,36 +1465,24 @@ static int __cpufreq_remove_dev_finish(struct device *dev, } /** - * __cpufreq_remove_dev - remove a CPU device + * cpufreq_remove_dev - remove a CPU device * * Removes the cpufreq interface for a CPU device. - * Caller should already have policy_rwsem in write mode for this CPU. - * This routine frees the rwsem before returning. */ -static inline int __cpufreq_remove_dev(struct device *dev, - struct subsys_interface *sif, - bool frozen) -{ - int ret; - - ret = __cpufreq_remove_dev_prepare(dev, sif, frozen); - - if (!ret) - ret = __cpufreq_remove_dev_finish(dev, sif, frozen); - - return ret; -} - static int cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif) { unsigned int cpu = dev->id; - int retval; + int ret; if (cpu_is_offline(cpu)) return 0; - retval = __cpufreq_remove_dev(dev, sif, false); - return retval; + ret = __cpufreq_remove_dev_prepare(dev, sif); + + if (!ret) + ret = __cpufreq_remove_dev_finish(dev, sif); + + return ret; } static void handle_update(struct work_struct *work) @@ -1359,8 +1511,8 @@ static void cpufreq_out_of_sync(unsigned int cpu, unsigned int old_freq, struct cpufreq_freqs freqs; unsigned long flags; - pr_debug("Warning: CPU frequency out of sync: cpufreq and timing " - "core thinks of %u, is %u kHz.\n", old_freq, new_freq); + pr_debug("Warning: CPU frequency out of sync: cpufreq and timing core thinks of %u, is %u kHz\n", + old_freq, new_freq); freqs.old = old_freq; freqs.new = new_freq; @@ -1369,8 +1521,8 @@ static void cpufreq_out_of_sync(unsigned int cpu, unsigned int old_freq, policy = per_cpu(cpufreq_cpu_data, cpu); read_unlock_irqrestore(&cpufreq_driver_lock, flags); - cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE); - cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE); + cpufreq_freq_transition_begin(policy, &freqs); + cpufreq_freq_transition_end(policy, &freqs, 0); } /** @@ -1449,20 +1601,16 @@ static unsigned int __cpufreq_get(unsigned int cpu) */ unsigned int cpufreq_get(unsigned int cpu) { + struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); unsigned int ret_freq = 0; - if (!down_read_trylock(&cpufreq_rwsem)) - return 0; - - if (unlikely(lock_policy_rwsem_read(cpu))) - goto out_policy; - - ret_freq = __cpufreq_get(cpu); - - unlock_policy_rwsem_read(cpu); + if (policy) { + down_read(&policy->rwsem); + ret_freq = __cpufreq_get(cpu); + up_read(&policy->rwsem); -out_policy: - up_read(&cpufreq_rwsem); + cpufreq_cpu_put(policy); + } return ret_freq; } @@ -1475,83 +1623,103 @@ static struct subsys_interface cpufreq_interface = { .remove_dev = cpufreq_remove_dev, }; +/* + * In case platform wants some specific frequency to be configured + * during suspend.. + */ +int cpufreq_generic_suspend(struct cpufreq_policy *policy) +{ + int ret; + + if (!policy->suspend_freq) { + pr_err("%s: suspend_freq can't be zero\n", __func__); + return -EINVAL; + } + + pr_debug("%s: Setting suspend-freq: %u\n", __func__, + policy->suspend_freq); + + ret = __cpufreq_driver_target(policy, policy->suspend_freq, + CPUFREQ_RELATION_H); + if (ret) + pr_err("%s: unable to set suspend-freq: %u. err: %d\n", + __func__, policy->suspend_freq, ret); + + return ret; +} +EXPORT_SYMBOL(cpufreq_generic_suspend); + /** - * cpufreq_bp_suspend - Prepare the boot CPU for system suspend. + * cpufreq_suspend() - Suspend CPUFreq governors * - * This function is only executed for the boot processor. The other CPUs - * have been put offline by means of CPU hotplug. + * Called during system wide Suspend/Hibernate cycles for suspending governors + * as some platforms can't change frequency after this point in suspend cycle. + * Because some of the devices (like: i2c, regulators, etc) they use for + * changing frequency are suspended quickly after this point. */ -static int cpufreq_bp_suspend(void) +void cpufreq_suspend(void) { - int ret = 0; - - int cpu = smp_processor_id(); struct cpufreq_policy *policy; - pr_debug("suspending cpu %u\n", cpu); + if (!cpufreq_driver) + return; - /* If there's no policy for the boot CPU, we have nothing to do. */ - policy = cpufreq_cpu_get(cpu); - if (!policy) - return 0; + if (!has_target()) + return; - if (cpufreq_driver->suspend) { - ret = cpufreq_driver->suspend(policy); - if (ret) - printk(KERN_ERR "cpufreq: suspend failed in ->suspend " - "step on CPU %u\n", policy->cpu); + pr_debug("%s: Suspending Governors\n", __func__); + + list_for_each_entry(policy, &cpufreq_policy_list, policy_list) { + if (__cpufreq_governor(policy, CPUFREQ_GOV_STOP)) + pr_err("%s: Failed to stop governor for policy: %p\n", + __func__, policy); + else if (cpufreq_driver->suspend + && cpufreq_driver->suspend(policy)) + pr_err("%s: Failed to suspend driver: %p\n", __func__, + policy); } - cpufreq_cpu_put(policy); - return ret; + cpufreq_suspended = true; } /** - * cpufreq_bp_resume - Restore proper frequency handling of the boot CPU. - * - * 1.) resume CPUfreq hardware support (cpufreq_driver->resume()) - * 2.) schedule call cpufreq_update_policy() ASAP as interrupts are - * restored. It will verify that the current freq is in sync with - * what we believe it to be. This is a bit later than when it - * should be, but nonethteless it's better than calling - * cpufreq_driver->get() here which might re-enable interrupts... + * cpufreq_resume() - Resume CPUFreq governors * - * This function is only executed for the boot CPU. The other CPUs have not - * been turned on yet. + * Called during system wide Suspend/Hibernate cycle for resuming governors that + * are suspended with cpufreq_suspend(). */ -static void cpufreq_bp_resume(void) +void cpufreq_resume(void) { - int ret = 0; - - int cpu = smp_processor_id(); struct cpufreq_policy *policy; - pr_debug("resuming cpu %u\n", cpu); + if (!cpufreq_driver) + return; - /* If there's no policy for the boot CPU, we have nothing to do. */ - policy = cpufreq_cpu_get(cpu); - if (!policy) + if (!has_target()) return; - if (cpufreq_driver->resume) { - ret = cpufreq_driver->resume(policy); - if (ret) { - printk(KERN_ERR "cpufreq: resume failed in ->resume " - "step on CPU %u\n", policy->cpu); - goto fail; - } - } + pr_debug("%s: Resuming Governors\n", __func__); - schedule_work(&policy->update); + cpufreq_suspended = false; -fail: - cpufreq_cpu_put(policy); -} + list_for_each_entry(policy, &cpufreq_policy_list, policy_list) { + if (cpufreq_driver->resume && cpufreq_driver->resume(policy)) + pr_err("%s: Failed to resume driver: %p\n", __func__, + policy); + else if (__cpufreq_governor(policy, CPUFREQ_GOV_START) + || __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS)) + pr_err("%s: Failed to start governor for policy: %p\n", + __func__, policy); -static struct syscore_ops cpufreq_syscore_ops = { - .suspend = cpufreq_bp_suspend, - .resume = cpufreq_bp_resume, -}; + /* + * schedule call cpufreq_update_policy() for boot CPU, i.e. last + * policy in list. It will verify that the current freq is in + * sync with what we believe it to be. + */ + if (list_is_last(&policy->policy_list, &cpufreq_policy_list)) + schedule_work(&policy->update); + } +} /** * cpufreq_get_current_driver - return current driver's name @@ -1650,12 +1818,92 @@ EXPORT_SYMBOL(cpufreq_unregister_notifier); * GOVERNORS * *********************************************************************/ +/* Must set freqs->new to intermediate frequency */ +static int __target_intermediate(struct cpufreq_policy *policy, + struct cpufreq_freqs *freqs, int index) +{ + int ret; + + freqs->new = cpufreq_driver->get_intermediate(policy, index); + + /* We don't need to switch to intermediate freq */ + if (!freqs->new) + return 0; + + pr_debug("%s: cpu: %d, switching to intermediate freq: oldfreq: %u, intermediate freq: %u\n", + __func__, policy->cpu, freqs->old, freqs->new); + + cpufreq_freq_transition_begin(policy, freqs); + ret = cpufreq_driver->target_intermediate(policy, index); + cpufreq_freq_transition_end(policy, freqs, ret); + + if (ret) + pr_err("%s: Failed to change to intermediate frequency: %d\n", + __func__, ret); + + return ret; +} + +static int __target_index(struct cpufreq_policy *policy, + struct cpufreq_frequency_table *freq_table, int index) +{ + struct cpufreq_freqs freqs = {.old = policy->cur, .flags = 0}; + unsigned int intermediate_freq = 0; + int retval = -EINVAL; + bool notify; + + notify = !(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION); + if (notify) { + /* Handle switching to intermediate frequency */ + if (cpufreq_driver->get_intermediate) { + retval = __target_intermediate(policy, &freqs, index); + if (retval) + return retval; + + intermediate_freq = freqs.new; + /* Set old freq to intermediate */ + if (intermediate_freq) + freqs.old = freqs.new; + } + + freqs.new = freq_table[index].frequency; + pr_debug("%s: cpu: %d, oldfreq: %u, new freq: %u\n", + __func__, policy->cpu, freqs.old, freqs.new); + + cpufreq_freq_transition_begin(policy, &freqs); + } + + retval = cpufreq_driver->target_index(policy, index); + if (retval) + pr_err("%s: Failed to change cpu frequency: %d\n", __func__, + retval); + + if (notify) { + cpufreq_freq_transition_end(policy, &freqs, retval); + + /* + * Failed after setting to intermediate freq? Driver should have + * reverted back to initial frequency and so should we. Check + * here for intermediate_freq instead of get_intermediate, in + * case we have't switched to intermediate freq at all. + */ + if (unlikely(retval && intermediate_freq)) { + freqs.old = intermediate_freq; + freqs.new = policy->restore_freq; + cpufreq_freq_transition_begin(policy, &freqs); + cpufreq_freq_transition_end(policy, &freqs, 0); + } + } + + return retval; +} + int __cpufreq_driver_target(struct cpufreq_policy *policy, unsigned int target_freq, unsigned int relation) { - int retval = -EINVAL; unsigned int old_target_freq = target_freq; + int retval = -EINVAL; if (cpufreq_disabled()) return -ENODEV; @@ -1667,14 +1915,48 @@ int __cpufreq_driver_target(struct cpufreq_policy *policy, target_freq = policy->min; pr_debug("target for CPU %u: %u kHz, relation %u, requested %u kHz\n", - policy->cpu, target_freq, relation, old_target_freq); + policy->cpu, target_freq, relation, old_target_freq); + /* + * This might look like a redundant call as we are checking it again + * after finding index. But it is left intentionally for cases where + * exactly same freq is called again and so we can save on few function + * calls. + */ if (target_freq == policy->cur) return 0; + /* Save last value to restore later on errors */ + policy->restore_freq = policy->cur; + if (cpufreq_driver->target) retval = cpufreq_driver->target(policy, target_freq, relation); + else if (cpufreq_driver->target_index) { + struct cpufreq_frequency_table *freq_table; + int index; + + freq_table = cpufreq_frequency_get_table(policy->cpu); + if (unlikely(!freq_table)) { + pr_err("%s: Unable to find freq_table\n", __func__); + goto out; + } + + retval = cpufreq_frequency_table_target(policy, freq_table, + target_freq, relation, &index); + if (unlikely(retval)) { + pr_err("%s: Unable to find matching freq\n", __func__); + goto out; + } + + if (freq_table[index].frequency == policy->cur) { + retval = 0; + goto out; + } + retval = __target_index(policy, freq_table, index); + } + +out: return retval; } EXPORT_SYMBOL_GPL(__cpufreq_driver_target); @@ -1685,14 +1967,12 @@ int cpufreq_driver_target(struct cpufreq_policy *policy, { int ret = -EINVAL; - if (unlikely(lock_policy_rwsem_write(policy->cpu))) - goto fail; + down_write(&policy->rwsem); ret = __cpufreq_driver_target(policy, target_freq, relation); - unlock_policy_rwsem_write(policy->cpu); + up_write(&policy->rwsem); -fail: return ret; } EXPORT_SYMBOL_GPL(cpufreq_driver_target); @@ -1716,17 +1996,18 @@ static int __cpufreq_governor(struct cpufreq_policy *policy, struct cpufreq_governor *gov = NULL; #endif + /* Don't start any governor operations if we are entering suspend */ + if (cpufreq_suspended) + return 0; + if (policy->governor->max_transition_latency && policy->cpuinfo.transition_latency > policy->governor->max_transition_latency) { if (!gov) return -EINVAL; else { - printk(KERN_WARNING "%s governor failed, too long" - " transition latency of HW, fallback" - " to %s governor\n", - policy->governor->name, - gov->name); + pr_warn("%s governor failed, too long transition latency of HW, fallback to %s governor\n", + policy->governor->name, gov->name); policy->governor = gov; } } @@ -1736,7 +2017,7 @@ static int __cpufreq_governor(struct cpufreq_policy *policy, return -EINVAL; pr_debug("__cpufreq_governor for CPU %u, event %u\n", - policy->cpu, event); + policy->cpu, event); mutex_lock(&cpufreq_governor_lock); if ((policy->governor_enabled && event == CPUFREQ_GOV_START) @@ -1803,9 +2084,7 @@ EXPORT_SYMBOL_GPL(cpufreq_register_governor); void cpufreq_unregister_governor(struct cpufreq_governor *governor) { -#ifdef CONFIG_HOTPLUG_CPU int cpu; -#endif if (!governor) return; @@ -1813,14 +2092,12 @@ void cpufreq_unregister_governor(struct cpufreq_governor *governor) if (cpufreq_disabled()) return; -#ifdef CONFIG_HOTPLUG_CPU for_each_present_cpu(cpu) { if (cpu_online(cpu)) continue; if (!strcmp(per_cpu(cpufreq_cpu_governor, cpu), governor->name)) strcpy(per_cpu(cpufreq_cpu_governor, cpu), "\0"); } -#endif mutex_lock(&cpufreq_governor_mutex); list_del(&governor->governor_list); @@ -1859,28 +2136,27 @@ int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu) EXPORT_SYMBOL(cpufreq_get_policy); /* - * data : current policy. - * policy : policy to be set. + * policy : current policy. + * new_policy: policy to be set. */ -static int __cpufreq_set_policy(struct cpufreq_policy *policy, +static int cpufreq_set_policy(struct cpufreq_policy *policy, struct cpufreq_policy *new_policy) { - int ret = 0, failed = 1; + struct cpufreq_governor *old_gov; + int ret; - pr_debug("setting new policy for CPU %u: %u - %u kHz\n", new_policy->cpu, - new_policy->min, new_policy->max); + pr_debug("setting new policy for CPU %u: %u - %u kHz\n", + new_policy->cpu, new_policy->min, new_policy->max); memcpy(&new_policy->cpuinfo, &policy->cpuinfo, sizeof(policy->cpuinfo)); - if (new_policy->min > policy->max || new_policy->max < policy->min) { - ret = -EINVAL; - goto error_out; - } + if (new_policy->min > policy->max || new_policy->max < policy->min) + return -EINVAL; /* verify the cpu speed can be set within this limit */ ret = cpufreq_driver->verify(new_policy); if (ret) - goto error_out; + return ret; /* adjust if necessary - all reasons */ blocking_notifier_call_chain(&cpufreq_policy_notifier_list, @@ -1896,7 +2172,7 @@ static int __cpufreq_set_policy(struct cpufreq_policy *policy, */ ret = cpufreq_driver->verify(new_policy); if (ret) - goto error_out; + return ret; /* notification of the new policy */ blocking_notifier_call_chain(&cpufreq_policy_notifier_list, @@ -1906,63 +2182,53 @@ static int __cpufreq_set_policy(struct cpufreq_policy *policy, policy->max = new_policy->max; pr_debug("new min and max freqs are %u - %u kHz\n", - policy->min, policy->max); + policy->min, policy->max); if (cpufreq_driver->setpolicy) { policy->policy = new_policy->policy; pr_debug("setting range\n"); - ret = cpufreq_driver->setpolicy(new_policy); - } else { - if (new_policy->governor != policy->governor) { - /* save old, working values */ - struct cpufreq_governor *old_gov = policy->governor; - - pr_debug("governor switch\n"); - - /* end old governor */ - if (policy->governor) { - __cpufreq_governor(policy, CPUFREQ_GOV_STOP); - unlock_policy_rwsem_write(new_policy->cpu); - __cpufreq_governor(policy, - CPUFREQ_GOV_POLICY_EXIT); - lock_policy_rwsem_write(new_policy->cpu); - } + return cpufreq_driver->setpolicy(new_policy); + } - /* start new governor */ - policy->governor = new_policy->governor; - if (!__cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT)) { - if (!__cpufreq_governor(policy, CPUFREQ_GOV_START)) { - failed = 0; - } else { - unlock_policy_rwsem_write(new_policy->cpu); - __cpufreq_governor(policy, - CPUFREQ_GOV_POLICY_EXIT); - lock_policy_rwsem_write(new_policy->cpu); - } - } + if (new_policy->governor == policy->governor) + goto out; - if (failed) { - /* new governor failed, so re-start old one */ - pr_debug("starting governor %s failed\n", - policy->governor->name); - if (old_gov) { - policy->governor = old_gov; - __cpufreq_governor(policy, - CPUFREQ_GOV_POLICY_INIT); - __cpufreq_governor(policy, - CPUFREQ_GOV_START); - } - ret = -EINVAL; - goto error_out; - } - /* might be a policy change, too, so fall through */ - } - pr_debug("governor: change or update limits\n"); - ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); + pr_debug("governor switch\n"); + + /* save old, working values */ + old_gov = policy->governor; + /* end old governor */ + if (old_gov) { + __cpufreq_governor(policy, CPUFREQ_GOV_STOP); + up_write(&policy->rwsem); + __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); + down_write(&policy->rwsem); } -error_out: - return ret; + /* start new governor */ + policy->governor = new_policy->governor; + if (!__cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT)) { + if (!__cpufreq_governor(policy, CPUFREQ_GOV_START)) + goto out; + + up_write(&policy->rwsem); + __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); + down_write(&policy->rwsem); + } + + /* new governor failed, so re-start old one */ + pr_debug("starting governor %s failed\n", policy->governor->name); + if (old_gov) { + policy->governor = old_gov; + __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT); + __cpufreq_governor(policy, CPUFREQ_GOV_START); + } + + return -EINVAL; + + out: + pr_debug("governor: change or update limits\n"); + return __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); } /** @@ -1978,15 +2244,10 @@ int cpufreq_update_policy(unsigned int cpu) struct cpufreq_policy new_policy; int ret; - if (!policy) { - ret = -ENODEV; - goto no_policy; - } + if (!policy) + return -ENODEV; - if (unlikely(lock_policy_rwsem_write(cpu))) { - ret = -EINVAL; - goto fail; - } + down_write(&policy->rwsem); pr_debug("updating policy for CPU %u\n", cpu); memcpy(&new_policy, policy, sizeof(*policy)); @@ -1999,25 +2260,29 @@ int cpufreq_update_policy(unsigned int cpu) * BIOS might change freq behind our back * -> ask driver for current freq and notify governors about a change */ - if (cpufreq_driver->get) { + if (cpufreq_driver->get && !cpufreq_driver->setpolicy) { new_policy.cur = cpufreq_driver->get(cpu); + if (WARN_ON(!new_policy.cur)) { + ret = -EIO; + goto unlock; + } + if (!policy->cur) { - pr_debug("Driver did not initialize current freq"); + pr_debug("Driver did not initialize current freq\n"); policy->cur = new_policy.cur; } else { - if (policy->cur != new_policy.cur && cpufreq_driver->target) + if (policy->cur != new_policy.cur && has_target()) cpufreq_out_of_sync(cpu, policy->cur, new_policy.cur); } } - ret = __cpufreq_set_policy(policy, &new_policy); + ret = cpufreq_set_policy(policy, &new_policy); - unlock_policy_rwsem_write(cpu); +unlock: + up_write(&policy->rwsem); -fail: cpufreq_cpu_put(policy); -no_policy: return ret; } EXPORT_SYMBOL(cpufreq_update_policy); @@ -2027,30 +2292,24 @@ static int cpufreq_cpu_callback(struct notifier_block *nfb, { unsigned int cpu = (unsigned long)hcpu; struct device *dev; - bool frozen = false; dev = get_cpu_device(cpu); if (dev) { - - if (action & CPU_TASKS_FROZEN) - frozen = true; - switch (action & ~CPU_TASKS_FROZEN) { case CPU_ONLINE: - __cpufreq_add_dev(dev, NULL, frozen); - cpufreq_update_policy(cpu); + __cpufreq_add_dev(dev, NULL); break; case CPU_DOWN_PREPARE: - __cpufreq_remove_dev_prepare(dev, NULL, frozen); + __cpufreq_remove_dev_prepare(dev, NULL); break; case CPU_POST_DEAD: - __cpufreq_remove_dev_finish(dev, NULL, frozen); + __cpufreq_remove_dev_finish(dev, NULL); break; case CPU_DOWN_FAILED: - __cpufreq_add_dev(dev, NULL, frozen); + __cpufreq_add_dev(dev, NULL); break; } } @@ -2062,6 +2321,73 @@ static struct notifier_block __refdata cpufreq_cpu_notifier = { }; /********************************************************************* + * BOOST * + *********************************************************************/ +static int cpufreq_boost_set_sw(int state) +{ + struct cpufreq_frequency_table *freq_table; + struct cpufreq_policy *policy; + int ret = -EINVAL; + + list_for_each_entry(policy, &cpufreq_policy_list, policy_list) { + freq_table = cpufreq_frequency_get_table(policy->cpu); + if (freq_table) { + ret = cpufreq_frequency_table_cpuinfo(policy, + freq_table); + if (ret) { + pr_err("%s: Policy frequency update failed\n", + __func__); + break; + } + policy->user_policy.max = policy->max; + __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); + } + } + + return ret; +} + +int cpufreq_boost_trigger_state(int state) +{ + unsigned long flags; + int ret = 0; + + if (cpufreq_driver->boost_enabled == state) + return 0; + + write_lock_irqsave(&cpufreq_driver_lock, flags); + cpufreq_driver->boost_enabled = state; + write_unlock_irqrestore(&cpufreq_driver_lock, flags); + + ret = cpufreq_driver->set_boost(state); + if (ret) { + write_lock_irqsave(&cpufreq_driver_lock, flags); + cpufreq_driver->boost_enabled = !state; + write_unlock_irqrestore(&cpufreq_driver_lock, flags); + + pr_err("%s: Cannot %s BOOST\n", + __func__, state ? "enable" : "disable"); + } + + return ret; +} + +int cpufreq_boost_supported(void) +{ + if (likely(cpufreq_driver)) + return cpufreq_driver->boost_supported; + + return 0; +} +EXPORT_SYMBOL_GPL(cpufreq_boost_supported); + +int cpufreq_boost_enabled(void) +{ + return cpufreq_driver->boost_enabled; +} +EXPORT_SYMBOL_GPL(cpufreq_boost_enabled); + +/********************************************************************* * REGISTER / UNREGISTER CPUFREQ DRIVER * *********************************************************************/ @@ -2084,7 +2410,11 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data) return -ENODEV; if (!driver_data || !driver_data->verify || !driver_data->init || - ((!driver_data->setpolicy) && (!driver_data->target))) + !(driver_data->setpolicy || driver_data->target_index || + driver_data->target) || + (driver_data->setpolicy && (driver_data->target_index || + driver_data->target)) || + (!!driver_data->get_intermediate != !!driver_data->target_intermediate)) return -EINVAL; pr_debug("trying to register driver %s\n", driver_data->name); @@ -2095,14 +2425,30 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data) write_lock_irqsave(&cpufreq_driver_lock, flags); if (cpufreq_driver) { write_unlock_irqrestore(&cpufreq_driver_lock, flags); - return -EBUSY; + return -EEXIST; } cpufreq_driver = driver_data; write_unlock_irqrestore(&cpufreq_driver_lock, flags); + if (cpufreq_boost_supported()) { + /* + * Check if driver provides function to enable boost - + * if not, use cpufreq_boost_set_sw as default + */ + if (!cpufreq_driver->set_boost) + cpufreq_driver->set_boost = cpufreq_boost_set_sw; + + ret = cpufreq_sysfs_create_file(&boost.attr); + if (ret) { + pr_err("%s: cannot register global BOOST sysfs file\n", + __func__); + goto err_null_driver; + } + } + ret = subsys_interface_register(&cpufreq_interface); if (ret) - goto err_null_driver; + goto err_boost_unreg; if (!(cpufreq_driver->flags & CPUFREQ_STICKY)) { int i; @@ -2118,7 +2464,7 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data) /* if all ->init() calls failed, unregister */ if (ret) { pr_debug("no CPU initialized for driver %s\n", - driver_data->name); + driver_data->name); goto err_if_unreg; } } @@ -2129,6 +2475,9 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data) return 0; err_if_unreg: subsys_interface_unregister(&cpufreq_interface); +err_boost_unreg: + if (cpufreq_boost_supported()) + cpufreq_sysfs_remove_file(&boost.attr); err_null_driver: write_lock_irqsave(&cpufreq_driver_lock, flags); cpufreq_driver = NULL; @@ -2155,6 +2504,9 @@ int cpufreq_unregister_driver(struct cpufreq_driver *driver) pr_debug("unregistering driver %s\n", driver->name); subsys_interface_unregister(&cpufreq_interface); + if (cpufreq_boost_supported()) + cpufreq_sysfs_remove_file(&boost.attr); + unregister_hotcpu_notifier(&cpufreq_cpu_notifier); down_write(&cpufreq_rwsem); @@ -2171,17 +2523,11 @@ EXPORT_SYMBOL_GPL(cpufreq_unregister_driver); static int __init cpufreq_core_init(void) { - int cpu; - if (cpufreq_disabled()) return -ENODEV; - for_each_possible_cpu(cpu) - init_rwsem(&per_cpu(cpu_policy_rwsem, cpu)); - cpufreq_global_kobject = kobject_create(); BUG_ON(!cpufreq_global_kobject); - register_syscore_ops(&cpufreq_syscore_ops); return 0; } |