#include <linux/cpu.h>
#include <linux/completion.h>
-#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, "cpufreq-core", msg)
-
/**
* The "cpufreq driver" - the arch- or hardware-dependend low
* level driver of CPUFreq support, and its spinlock. This lock
static struct cpufreq_policy *cpufreq_cpu_data[NR_CPUS];
static spinlock_t cpufreq_driver_lock = SPIN_LOCK_UNLOCKED;
-
-/* we keep a copy of all ->add'ed CPU's struct sys_device here;
- * as it is only accessed in ->add and ->remove, no lock or reference
- * count is necessary.
- */
-static struct sys_device *cpu_sys_devices[NR_CPUS];
-
-
/* internal prototypes */
static int __cpufreq_governor(struct cpufreq_policy *policy, unsigned int event);
static void handle_update(void *data);
module_put(cpufreq_driver->owner);
}
-
-/*********************************************************************
- * UNIFIED DEBUG HELPERS *
- *********************************************************************/
-#ifdef CONFIG_CPU_FREQ_DEBUG
-
-/* what part(s) of the CPUfreq subsystem are debugged? */
-static unsigned int debug;
-
-/* is the debug output ratelimit'ed using printk_ratelimit? User can
- * set or modify this value.
- */
-static unsigned int debug_ratelimit = 1;
-
-/* is the printk_ratelimit'ing enabled? It's enabled after a successful
- * loading of a cpufreq driver, temporarily disabled when a new policy
- * is set, and disabled upon cpufreq driver removal
- */
-static unsigned int disable_ratelimit = 1;
-static spinlock_t disable_ratelimit_lock = SPIN_LOCK_UNLOCKED;
-
-static inline void cpufreq_debug_enable_ratelimit(void)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&disable_ratelimit_lock, flags);
- if (disable_ratelimit)
- disable_ratelimit--;
- spin_unlock_irqrestore(&disable_ratelimit_lock, flags);
-}
-
-static inline void cpufreq_debug_disable_ratelimit(void)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&disable_ratelimit_lock, flags);
- disable_ratelimit++;
- spin_unlock_irqrestore(&disable_ratelimit_lock, flags);
-}
-
-void cpufreq_debug_printk(unsigned int type, const char *prefix, const char *fmt, ...)
-{
- char s[256];
- va_list args;
- unsigned int len;
- unsigned long flags;
-
- WARN_ON(!prefix);
- if (type & debug) {
- spin_lock_irqsave(&disable_ratelimit_lock, flags);
- if (!disable_ratelimit && debug_ratelimit && !printk_ratelimit()) {
- spin_unlock_irqrestore(&disable_ratelimit_lock, flags);
- return;
- }
- spin_unlock_irqrestore(&disable_ratelimit_lock, flags);
-
- len = snprintf(s, 256, KERN_DEBUG "%s: ", prefix);
-
- va_start(args, fmt);
- len += vsnprintf(&s[len], (256 - len), fmt, args);
- va_end(args);
-
- printk(s);
-
- WARN_ON(len < 5);
- }
-}
-EXPORT_SYMBOL(cpufreq_debug_printk);
-
-
-module_param(debug, uint, 0644);
-MODULE_PARM_DESC(debug, "CPUfreq debugging: add 1 to debug core, 2 to debug drivers, and 4 to debug governors.");
-
-module_param(debug_ratelimit, uint, 0644);
-MODULE_PARM_DESC(debug_ratelimit, "CPUfreq debugging: set to 0 to disable ratelimiting.");
-
-#else /* !CONFIG_CPU_FREQ_DEBUG */
-
-static inline void cpufreq_debug_enable_ratelimit(void) { return; }
-static inline void cpufreq_debug_disable_ratelimit(void) { return; }
-
-#endif /* CONFIG_CPU_FREQ_DEBUG */
-
-
/*********************************************************************
* EXTERNALLY AFFECTING FREQUENCY CHANGES *
*********************************************************************/
if (!l_p_j_ref_freq) {
l_p_j_ref = loops_per_jiffy;
l_p_j_ref_freq = ci->old;
- dprintk("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_PRECHANGE && ci->old < ci->new) ||
(val == CPUFREQ_POSTCHANGE && ci->old > ci->new) ||
- (val == CPUFREQ_RESUMECHANGE)) {
+ (val == CPUFREQ_RESUMECHANGE))
loops_per_jiffy = cpufreq_scale(l_p_j_ref, l_p_j_ref_freq, ci->new);
- dprintk("scaling loops_per_jiffy to %lu for frequency %u kHz\n", loops_per_jiffy, ci->new);
- }
}
#else
static inline void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci) { return; }
BUG_ON(irqs_disabled());
freqs->flags = cpufreq_driver->flags;
- dprintk("notification %u of frequency transition to %u kHz\n", state, freqs->new);
down_read(&cpufreq_notifier_rwsem);
switch (state) {
*/
if (!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) {
if ((likely(cpufreq_cpu_data[freqs->cpu])) &&
- (likely(cpufreq_cpu_data[freqs->cpu]->cpu == freqs->cpu)) &&
(likely(cpufreq_cpu_data[freqs->cpu]->cur)) &&
(unlikely(freqs->old != cpufreq_cpu_data[freqs->cpu]->cur)))
{
case CPUFREQ_POSTCHANGE:
adjust_jiffies(CPUFREQ_POSTCHANGE, freqs);
notifier_call_chain(&cpufreq_transition_notifier_list, CPUFREQ_POSTCHANGE, freqs);
- if ((likely(cpufreq_cpu_data[freqs->cpu])) &&
- (likely(cpufreq_cpu_data[freqs->cpu]->cpu == freqs->cpu)))
+ if (likely(cpufreq_cpu_data[freqs->cpu]))
cpufreq_cpu_data[freqs->cpu]->cur = freqs->new;
break;
}
i += sprintf(&buf[i], "\n");
return i;
}
-/**
- * show_affected_cpus - show the CPUs affected by each transition
- */
-static ssize_t show_affected_cpus (struct cpufreq_policy * policy, char *buf)
-{
- ssize_t i = 0;
- unsigned int cpu;
-
- for_each_cpu_mask(cpu, policy->cpus) {
- if (i)
- i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), " ");
- i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), "%u", cpu);
- if (i >= (PAGE_SIZE - 5))
- break;
- }
- i += sprintf(&buf[i], "\n");
- return i;
-}
#define define_one_ro(_name) \
-static struct freq_attr _name = \
-__ATTR(_name, 0444, show_##_name, NULL)
+struct freq_attr _name = { \
+ .attr = { .name = __stringify(_name), .mode = 0444 }, \
+ .show = show_##_name, \
+}
#define define_one_ro0400(_name) \
-static struct freq_attr _name = \
-__ATTR(_name, 0400, show_##_name, NULL)
+struct freq_attr _name = { \
+ .attr = { .name = __stringify(_name), .mode = 0400 }, \
+ .show = show_##_name, \
+}
#define define_one_rw(_name) \
-static struct freq_attr _name = \
-__ATTR(_name, 0644, show_##_name, store_##_name)
+struct freq_attr _name = { \
+ .attr = { .name = __stringify(_name), .mode = 0644 }, \
+ .show = show_##_name, \
+ .store = store_##_name, \
+}
define_one_ro0400(cpuinfo_cur_freq);
define_one_ro(cpuinfo_min_freq);
define_one_ro(scaling_available_governors);
define_one_ro(scaling_driver);
define_one_ro(scaling_cur_freq);
-define_one_ro(affected_cpus);
define_one_rw(scaling_min_freq);
define_one_rw(scaling_max_freq);
define_one_rw(scaling_governor);
&cpuinfo_max_freq.attr,
&scaling_min_freq.attr,
&scaling_max_freq.attr,
- &affected_cpus.attr,
&scaling_governor.attr,
&scaling_driver.attr,
&scaling_available_governors.attr,
static void cpufreq_sysfs_release(struct kobject * kobj)
{
struct cpufreq_policy * policy = to_policy(kobj);
- dprintk("last reference is dropped\n");
complete(&policy->kobj_unregister);
}
struct cpufreq_policy *policy;
struct freq_attr **drv_attr;
unsigned long flags;
- unsigned int j;
-
- cpufreq_debug_disable_ratelimit();
- dprintk("adding CPU %u\n", cpu);
-
-#ifdef CONFIG_SMP
- /* check whether a different CPU already registered this
- * CPU because it is in the same boat. */
- policy = cpufreq_cpu_get(cpu);
- if (unlikely(policy)) {
- cpu_sys_devices[cpu] = sys_dev;
- dprintk("CPU already managed, adding link\n");
- sysfs_create_link(&sys_dev->kobj, &policy->kobj, "cpufreq");
- cpufreq_debug_enable_ratelimit();
- return 0;
- }
-#endif
- if (!try_module_get(cpufreq_driver->owner)) {
- ret = -EINVAL;
- goto module_out;
- }
+ if (!try_module_get(cpufreq_driver->owner))
+ return -EINVAL;
policy = kmalloc(sizeof(struct cpufreq_policy), GFP_KERNEL);
if (!policy) {
memset(policy, 0, sizeof(struct cpufreq_policy));
policy->cpu = cpu;
- policy->cpus = cpumask_of_cpu(cpu);
-
init_MUTEX_LOCKED(&policy->lock);
init_completion(&policy->kobj_unregister);
INIT_WORK(&policy->update, handle_update, (void *)(long)cpu);
* to accept all calls to ->verify and ->setpolicy for this CPU
*/
ret = cpufreq_driver->init(policy);
- if (ret) {
- dprintk("initialization failed\n");
+ if (ret)
goto err_out;
- }
memcpy(&new_policy, policy, sizeof(struct cpufreq_policy));
sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr);
spin_lock_irqsave(&cpufreq_driver_lock, flags);
- for_each_cpu_mask(j, policy->cpus)
- cpufreq_cpu_data[j] = policy;
+ cpufreq_cpu_data[cpu] = policy;
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
policy->governor = NULL; /* to assure that the starting sequence is
* run in cpufreq_set_policy */
/* set default policy */
ret = cpufreq_set_policy(&new_policy);
- if (ret) {
- dprintk("setting policy failed\n");
+ if (ret)
goto err_out_unregister;
- }
module_put(cpufreq_driver->owner);
- cpu_sys_devices[cpu] = sys_dev;
- dprintk("initialization complete\n");
- cpufreq_debug_enable_ratelimit();
-
return 0;
err_out_unregister:
spin_lock_irqsave(&cpufreq_driver_lock, flags);
- for_each_cpu_mask(j, policy->cpus)
- cpufreq_cpu_data[j] = NULL;
+ cpufreq_cpu_data[cpu] = NULL;
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
kobject_unregister(&policy->kobj);
nomem_out:
module_put(cpufreq_driver->owner);
- module_out:
- cpufreq_debug_enable_ratelimit();
return ret;
}
unsigned int cpu = sys_dev->id;
unsigned long flags;
struct cpufreq_policy *data;
-#ifdef CONFIG_SMP
- unsigned int j;
-#endif
-
- cpufreq_debug_disable_ratelimit();
- dprintk("unregistering CPU %u\n", cpu);
spin_lock_irqsave(&cpufreq_driver_lock, flags);
data = cpufreq_cpu_data[cpu];
if (!data) {
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
- cpu_sys_devices[cpu] = NULL;
- cpufreq_debug_enable_ratelimit();
return -EINVAL;
}
cpufreq_cpu_data[cpu] = NULL;
-
-
-#ifdef CONFIG_SMP
- /* if this isn't the CPU which is the parent of the kobj, we
- * only need to unlink, put and exit
- */
- if (unlikely(cpu != data->cpu)) {
- dprintk("removing link\n");
- spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
- sysfs_remove_link(&sys_dev->kobj, "cpufreq");
- cpu_sys_devices[cpu] = NULL;
- cpufreq_cpu_put(data);
- cpufreq_debug_enable_ratelimit();
- return 0;
- }
-#endif
-
- cpu_sys_devices[cpu] = NULL;
-
- if (!kobject_get(&data->kobj)) {
- spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
- cpufreq_debug_enable_ratelimit();
- return -EFAULT;
- }
-
-#ifdef CONFIG_SMP
- /* if we have other CPUs still registered, we need to unlink them,
- * or else wait_for_completion below will lock up. Clean the
- * cpufreq_cpu_data[] while holding the lock, and remove the sysfs
- * links afterwards.
- */
- if (unlikely(cpus_weight(data->cpus) > 1)) {
- for_each_cpu_mask(j, data->cpus) {
- if (j == cpu)
- continue;
- cpufreq_cpu_data[j] = NULL;
- }
- }
-
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
- if (unlikely(cpus_weight(data->cpus) > 1)) {
- for_each_cpu_mask(j, data->cpus) {
- if (j == cpu)
- continue;
- dprintk("removing link for cpu %u\n", j);
- sysfs_remove_link(&cpu_sys_devices[j]->kobj, "cpufreq");
- cpufreq_cpu_put(data);
- }
- }
-#else
- spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
-#endif
+ if (!kobject_get(&data->kobj))
+ return -EFAULT;
if (cpufreq_driver->target)
__cpufreq_governor(data, CPUFREQ_GOV_STOP);
* not referenced anymore by anybody before we proceed with
* unloading.
*/
- dprintk("waiting for dropping of refcount\n");
wait_for_completion(&data->kobj_unregister);
- dprintk("wait complete\n");
if (cpufreq_driver->exit)
cpufreq_driver->exit(data);
kfree(data);
- cpufreq_debug_enable_ratelimit();
-
return 0;
}
static void handle_update(void *data)
{
unsigned int cpu = (unsigned int)(long)data;
- dprintk("handle_update for cpu %u called\n", cpu);
cpufreq_update_policy(cpu);
}
unsigned int ret = 0;
struct cpufreq_policy *cpu_policy;
- dprintk("resuming cpu %u\n", cpu);
-
if (!cpu_online(cpu))
return 0;
if (!cpu_policy)
return -EINVAL;
- /* only handle each CPU group once */
- if (unlikely(cpu_policy->cpu != cpu)) {
- cpufreq_cpu_put(cpu_policy);
- return 0;
- }
-
if (!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) {
unsigned int cur_freq = 0;
{
int retval = -EINVAL;
lock_cpu_hotplug();
- dprintk("target for CPU %u: %u kHz, relation %u\n", policy->cpu,
- target_freq, relation);
if (cpu_online(policy->cpu))
retval = cpufreq_driver->target(policy, target_freq, relation);
unlock_cpu_hotplug();
if (!try_module_get(policy->governor->owner))
return -EINVAL;
- dprintk("__cpufreq_governor for CPU %u, event %u\n", policy->cpu, event);
ret = policy->governor->governor(policy, event);
/* we keep one module reference alive for each CPU governed by this CPU */
{
int ret = 0;
- cpufreq_debug_disable_ratelimit();
- dprintk("setting new policy for CPU %u: %u - %u kHz\n", policy->cpu,
- policy->min, policy->max);
-
memcpy(&policy->cpuinfo,
&data->cpuinfo,
sizeof(struct cpufreq_cpuinfo));
data->min = policy->min;
data->max = policy->max;
- dprintk("new min and max freqs are %u - %u kHz\n", data->min, data->max);
-
if (cpufreq_driver->setpolicy) {
data->policy = policy->policy;
- dprintk("setting range\n");
ret = cpufreq_driver->setpolicy(policy);
} else {
if (policy->governor != data->governor) {
/* save old, working values */
struct cpufreq_governor *old_gov = data->governor;
- dprintk("governor switch\n");
-
/* end old governor */
if (data->governor)
__cpufreq_governor(data, CPUFREQ_GOV_STOP);
data->governor = policy->governor;
if (__cpufreq_governor(data, CPUFREQ_GOV_START)) {
/* new governor failed, so re-start old one */
- dprintk("starting governor %s failed\n", data->governor->name);
if (old_gov) {
data->governor = old_gov;
__cpufreq_governor(data, CPUFREQ_GOV_START);
}
/* might be a policy change, too, so fall through */
}
- dprintk("governor: change or update limits\n");
__cpufreq_governor(data, CPUFREQ_GOV_LIMITS);
}
error_out:
- cpufreq_debug_enable_ratelimit();
return ret;
}
down(&data->lock);
- dprintk("updating policy for CPU %u\n", cpu);
memcpy(&policy,
data,
sizeof(struct cpufreq_policy));
((!driver_data->setpolicy) && (!driver_data->target)))
return -EINVAL;
- dprintk("trying to register driver %s\n", driver_data->name);
-
if (driver_data->setpolicy)
driver_data->flags |= CPUFREQ_CONST_LOOPS;
/* if all ->init() calls failed, unregister */
if (ret) {
- dprintk("no CPU initialized for driver %s\n", driver_data->name);
sysdev_driver_unregister(&cpu_sysdev_class, &cpufreq_sysdev_driver);
spin_lock_irqsave(&cpufreq_driver_lock, flags);
}
}
- if (!ret) {
- dprintk("driver %s up and running\n", driver_data->name);
- cpufreq_debug_enable_ratelimit();
- }
-
return (ret);
}
EXPORT_SYMBOL_GPL(cpufreq_register_driver);
{
unsigned long flags;
- cpufreq_debug_disable_ratelimit();
-
- if (!cpufreq_driver || (driver != cpufreq_driver)) {
- cpufreq_debug_enable_ratelimit();
+ if (!cpufreq_driver || (driver != cpufreq_driver))
return -EINVAL;
- }
-
- dprintk("unregistering driver %s\n", driver->name);
sysdev_driver_unregister(&cpu_sysdev_class, &cpufreq_sysdev_driver);
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