*/
static struct cpufreq_driver *cpufreq_driver;
static struct cpufreq_policy *cpufreq_cpu_data[NR_CPUS];
+#ifdef CONFIG_HOTPLUG_CPU
+/* This one keeps track of the previously set governor of a removed CPU */
+static struct cpufreq_governor *cpufreq_cpu_governor[NR_CPUS];
+#endif
static DEFINE_SPINLOCK(cpufreq_driver_lock);
/*
static BLOCKING_NOTIFIER_HEAD(cpufreq_policy_notifier_list);
static struct srcu_notifier_head cpufreq_transition_notifier_list;
+static bool init_cpufreq_transition_notifier_list_called;
static int __init init_cpufreq_transition_notifier_list(void)
{
srcu_init_notifier_head(&cpufreq_transition_notifier_list);
+ init_cpufreq_transition_notifier_list_called = true;
return 0;
}
pure_initcall(init_cpufreq_transition_notifier_list);
}
void cpufreq_debug_printk(unsigned int type, const char *prefix,
- const char *fmt, ...)
+ const char *fmt, ...)
{
char s[256];
va_list args;
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;"
+ 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_RESUMECHANGE || val == CPUFREQ_SUSPENDCHANGE)) {
loops_per_jiffy = cpufreq_scale(l_p_j_ref, l_p_j_ref_freq,
ci->new);
- dprintk("scaling loops_per_jiffy to %lu"
+ dprintk("scaling loops_per_jiffy to %lu "
"for frequency %u kHz\n", loops_per_jiffy, ci->new);
}
}
/**
* cpufreq_parse_governor - parse a governor string
*/
-static int cpufreq_parse_governor (char *str_governor, unsigned int *policy,
+static int cpufreq_parse_governor(char *str_governor, unsigned int *policy,
struct cpufreq_governor **governor)
{
int err = -EINVAL;
int ret;
mutex_unlock(&cpufreq_governor_mutex);
- ret = request_module(name);
+ ret = request_module("%s", name);
mutex_lock(&cpufreq_governor_mutex);
if (ret == 0)
#define show_one(file_name, object) \
static ssize_t show_##file_name \
-(struct cpufreq_policy * policy, char *buf) \
+(struct cpufreq_policy *policy, char *buf) \
{ \
return sprintf (buf, "%u\n", policy->object); \
}
*/
#define store_one(file_name, object) \
static ssize_t store_##file_name \
-(struct cpufreq_policy * policy, const char *buf, size_t count) \
+(struct cpufreq_policy *policy, const char *buf, size_t count) \
{ \
unsigned int ret = -EINVAL; \
struct cpufreq_policy new_policy; \
/**
* show_cpuinfo_cur_freq - current CPU frequency as detected by hardware
*/
-static ssize_t show_cpuinfo_cur_freq (struct cpufreq_policy * policy,
- char *buf)
+static ssize_t show_cpuinfo_cur_freq(struct cpufreq_policy *policy,
+ char *buf)
{
unsigned int cur_freq = __cpufreq_get(policy->cpu);
if (!cur_freq)
/**
* show_scaling_governor - show the current policy for the specified CPU
*/
-static ssize_t show_scaling_governor (struct cpufreq_policy * policy,
- char *buf)
+static ssize_t show_scaling_governor(struct cpufreq_policy *policy, char *buf)
{
if(policy->policy == CPUFREQ_POLICY_POWERSAVE)
return sprintf(buf, "powersave\n");
/**
* store_scaling_governor - store policy for the specified CPU
*/
-static ssize_t store_scaling_governor (struct cpufreq_policy * policy,
- const char *buf, size_t count)
+static ssize_t store_scaling_governor(struct cpufreq_policy *policy,
+ const char *buf, size_t count)
{
unsigned int ret = -EINVAL;
char str_governor[16];
/**
* show_scaling_driver - show the cpufreq driver currently loaded
*/
-static ssize_t show_scaling_driver (struct cpufreq_policy * policy, char *buf)
+static ssize_t show_scaling_driver(struct cpufreq_policy *policy, char *buf)
{
return scnprintf(buf, CPUFREQ_NAME_LEN, "%s\n", cpufreq_driver->name);
}
/**
* show_scaling_available_governors - show the available CPUfreq governors
*/
-static ssize_t show_scaling_available_governors (struct cpufreq_policy *policy,
- char *buf)
+static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy,
+ char *buf)
{
ssize_t i = 0;
struct cpufreq_governor *t;
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)
+
+static ssize_t show_cpus(cpumask_t mask, char *buf)
{
ssize_t i = 0;
unsigned int cpu;
- for_each_cpu_mask(cpu, policy->cpus) {
+ for_each_cpu_mask(cpu, mask) {
if (i)
i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), " ");
i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), "%u", cpu);
return i;
}
+/**
+ * show_related_cpus - show the CPUs affected by each transition even if
+ * hw coordination is in use
+ */
+static ssize_t show_related_cpus(struct cpufreq_policy *policy, char *buf)
+{
+ if (cpus_empty(policy->related_cpus))
+ return show_cpus(policy->cpus, buf);
+ return show_cpus(policy->related_cpus, buf);
+}
+
+/**
+ * show_affected_cpus - show the CPUs affected by each transition
+ */
+static ssize_t show_affected_cpus(struct cpufreq_policy *policy, char *buf)
+{
+ return show_cpus(policy->cpus, buf);
+}
+
+static ssize_t store_scaling_setspeed(struct cpufreq_policy *policy,
+ const char *buf, size_t count)
+{
+ unsigned int freq = 0;
+ unsigned int ret;
+
+ if (!policy->governor || !policy->governor->store_setspeed)
+ return -EINVAL;
+
+ ret = sscanf(buf, "%u", &freq);
+ if (ret != 1)
+ return -EINVAL;
+
+ policy->governor->store_setspeed(policy, freq);
+
+ return count;
+}
+
+static ssize_t show_scaling_setspeed(struct cpufreq_policy *policy, char *buf)
+{
+ if (!policy->governor || !policy->governor->show_setspeed)
+ return sprintf(buf, "<unsupported>\n");
+
+ return policy->governor->show_setspeed(policy, buf);
+}
#define define_one_ro(_name) \
static struct freq_attr _name = \
define_one_ro(scaling_available_governors);
define_one_ro(scaling_driver);
define_one_ro(scaling_cur_freq);
+define_one_ro(related_cpus);
define_one_ro(affected_cpus);
define_one_rw(scaling_min_freq);
define_one_rw(scaling_max_freq);
define_one_rw(scaling_governor);
+define_one_rw(scaling_setspeed);
-static struct attribute * default_attrs[] = {
+static struct attribute *default_attrs[] = {
&cpuinfo_min_freq.attr,
&cpuinfo_max_freq.attr,
&scaling_min_freq.attr,
&scaling_max_freq.attr,
&affected_cpus.attr,
+ &related_cpus.attr,
&scaling_governor.attr,
&scaling_driver.attr,
&scaling_available_governors.attr,
+ &scaling_setspeed.attr,
NULL
};
#define to_policy(k) container_of(k,struct cpufreq_policy,kobj)
#define to_attr(a) container_of(a,struct freq_attr,attr)
-static ssize_t show(struct kobject * kobj, struct attribute * attr ,char * buf)
+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;
+ struct cpufreq_policy *policy = to_policy(kobj);
+ struct freq_attr *fattr = to_attr(attr);
+ ssize_t ret = -EINVAL;
policy = cpufreq_cpu_get(policy->cpu);
if (!policy)
- return -EINVAL;
+ goto no_policy;
if (lock_policy_rwsem_read(policy->cpu) < 0)
- return -EINVAL;
+ goto fail;
if (fattr->show)
ret = fattr->show(policy, buf);
ret = -EIO;
unlock_policy_rwsem_read(policy->cpu);
-
+fail:
cpufreq_cpu_put(policy);
+no_policy:
return ret;
}
-static ssize_t store(struct kobject * kobj, struct attribute * attr,
- const char * buf, size_t count)
+static ssize_t store(struct kobject *kobj, struct attribute *attr,
+ const char *buf, size_t count)
{
- struct cpufreq_policy * policy = to_policy(kobj);
- struct freq_attr * fattr = to_attr(attr);
- ssize_t ret;
+ struct cpufreq_policy *policy = to_policy(kobj);
+ struct freq_attr *fattr = to_attr(attr);
+ ssize_t ret = -EINVAL;
policy = cpufreq_cpu_get(policy->cpu);
if (!policy)
- return -EINVAL;
+ goto no_policy;
if (lock_policy_rwsem_write(policy->cpu) < 0)
- return -EINVAL;
+ goto fail;
if (fattr->store)
ret = fattr->store(policy, buf, count);
ret = -EIO;
unlock_policy_rwsem_write(policy->cpu);
-
+fail:
cpufreq_cpu_put(policy);
+no_policy:
return ret;
}
-static void cpufreq_sysfs_release(struct kobject * kobj)
+static void cpufreq_sysfs_release(struct kobject *kobj)
{
- struct cpufreq_policy * policy = to_policy(kobj);
+ struct cpufreq_policy *policy = to_policy(kobj);
dprintk("last reference is dropped\n");
complete(&policy->kobj_unregister);
}
*
* Adds the cpufreq interface for a CPU device.
*/
-static int cpufreq_add_dev (struct sys_device * sys_dev)
+static int cpufreq_add_dev(struct sys_device *sys_dev)
{
unsigned int cpu = sys_dev->id;
int ret = 0;
init_completion(&policy->kobj_unregister);
INIT_WORK(&policy->update, handle_update);
+ /* Set governor before ->init, so that driver could check it */
+ policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
/* call driver. From then on the cpufreq must be able
* to accept all calls to ->verify and ->setpolicy for this CPU
*/
ret = cpufreq_driver->init(policy);
if (ret) {
dprintk("initialization failed\n");
- unlock_policy_rwsem_write(cpu);
goto err_out;
}
+ policy->user_policy.min = policy->cpuinfo.min_freq;
+ policy->user_policy.max = policy->cpuinfo.max_freq;
#ifdef CONFIG_SMP
+
+#ifdef CONFIG_HOTPLUG_CPU
+ if (cpufreq_cpu_governor[cpu]){
+ policy->governor = cpufreq_cpu_governor[cpu];
+ dprintk("Restoring governor %s for cpu %d\n",
+ policy->governor->name, cpu);
+ }
+#endif
+
for_each_cpu_mask(j, policy->cpus) {
if (cpu == j)
continue;
/* check for existing affected CPUs. They may not be aware
* of it due to CPU Hotplug.
*/
- managed_policy = cpufreq_cpu_get(j);
+ managed_policy = cpufreq_cpu_get(j); // FIXME: Where is this released? What about error paths?
if (unlikely(managed_policy)) {
/* Set proper policy_cpu */
ret = sysfs_create_link(&sys_dev->kobj,
&managed_policy->kobj,
"cpufreq");
- if (ret) {
- unlock_policy_rwsem_write(cpu);
+ if (ret)
goto err_out_driver_exit;
- }
cpufreq_debug_enable_ratelimit();
ret = 0;
- unlock_policy_rwsem_write(cpu);
goto err_out_driver_exit; /* call driver->exit() */
}
}
memcpy(&new_policy, policy, sizeof(struct cpufreq_policy));
/* prepare interface data */
- policy->kobj.parent = &sys_dev->kobj;
- policy->kobj.ktype = &ktype_cpufreq;
- strlcpy(policy->kobj.name, "cpufreq", KOBJ_NAME_LEN);
-
- ret = kobject_register(&policy->kobj);
- if (ret) {
- unlock_policy_rwsem_write(cpu);
+ ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq, &sys_dev->kobj,
+ "cpufreq");
+ if (ret)
goto err_out_driver_exit;
- }
+
/* set up files for this cpu device */
drv_attr = cpufreq_driver->attr;
while ((drv_attr) && (*drv_attr)) {
- sysfs_create_file(&policy->kobj, &((*drv_attr)->attr));
+ ret = sysfs_create_file(&policy->kobj, &((*drv_attr)->attr));
+ if (ret)
+ goto err_out_driver_exit;
drv_attr++;
}
- if (cpufreq_driver->get)
- sysfs_create_file(&policy->kobj, &cpuinfo_cur_freq.attr);
- if (cpufreq_driver->target)
- sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr);
+ if (cpufreq_driver->get) {
+ ret = sysfs_create_file(&policy->kobj, &cpuinfo_cur_freq.attr);
+ if (ret)
+ goto err_out_driver_exit;
+ }
+ if (cpufreq_driver->target) {
+ ret = sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr);
+ if (ret)
+ goto err_out_driver_exit;
+ }
spin_lock_irqsave(&cpufreq_driver_lock, flags);
for_each_cpu_mask(j, policy->cpus) {
cpu_sys_dev = get_cpu_sysdev(j);
ret = sysfs_create_link(&cpu_sys_dev->kobj, &policy->kobj,
"cpufreq");
- if (ret) {
- unlock_policy_rwsem_write(cpu);
+ if (ret)
goto err_out_unregister;
- }
}
policy->governor = NULL; /* to assure that the starting sequence is
* run in cpufreq_set_policy */
- unlock_policy_rwsem_write(cpu);
/* set default policy */
- ret = cpufreq_set_policy(&new_policy);
+ ret = __cpufreq_set_policy(policy, &new_policy);
+ policy->user_policy.policy = policy->policy;
+ policy->user_policy.governor = policy->governor;
+
if (ret) {
dprintk("setting policy failed\n");
goto err_out_unregister;
}
+ unlock_policy_rwsem_write(cpu);
+
+ kobject_uevent(&policy->kobj, KOBJ_ADD);
module_put(cpufreq_driver->owner);
dprintk("initialization complete\n");
cpufreq_debug_enable_ratelimit();
cpufreq_cpu_data[j] = NULL;
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
- kobject_unregister(&policy->kobj);
+ kobject_put(&policy->kobj);
wait_for_completion(&policy->kobj_unregister);
err_out_driver_exit:
cpufreq_driver->exit(policy);
err_out:
+ unlock_policy_rwsem_write(cpu);
kfree(policy);
nomem_out:
* Caller should already have policy_rwsem in write mode for this CPU.
* This routine frees the rwsem before returning.
*/
-static int __cpufreq_remove_dev (struct sys_device * sys_dev)
+static int __cpufreq_remove_dev(struct sys_device *sys_dev)
{
unsigned int cpu = sys_dev->id;
unsigned long flags;
}
#endif
+#ifdef CONFIG_SMP
- if (!kobject_get(&data->kobj)) {
- spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
- cpufreq_debug_enable_ratelimit();
- unlock_policy_rwsem_write(cpu);
- return -EFAULT;
- }
+#ifdef CONFIG_HOTPLUG_CPU
+ cpufreq_cpu_governor[cpu] = data->governor;
+#endif
-#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
if (j == cpu)
continue;
dprintk("removing link for cpu %u\n", j);
+#ifdef CONFIG_HOTPLUG_CPU
+ cpufreq_cpu_governor[j] = data->governor;
+#endif
cpu_sys_dev = get_cpu_sysdev(j);
sysfs_remove_link(&cpu_sys_dev->kobj, "cpufreq");
cpufreq_cpu_put(data);
unlock_policy_rwsem_write(cpu);
- kobject_unregister(&data->kobj);
-
kobject_put(&data->kobj);
/* we need to make sure that the underlying kobj is actually
}
-static int cpufreq_remove_dev (struct sys_device * sys_dev)
+static int cpufreq_remove_dev(struct sys_device *sys_dev)
{
unsigned int cpu = sys_dev->id;
int retval;
+
+ if (cpu_is_offline(cpu))
+ return 0;
+
if (unlikely(lock_policy_rwsem_write(cpu)))
BUG();
unsigned int ret_freq = 0;
if (policy) {
- if (unlikely(lock_policy_rwsem_read(cpu)))
- return ret_freq;
-
ret_freq = policy->cur;
-
- unlock_policy_rwsem_read(cpu);
cpufreq_cpu_put(policy);
}
- return (ret_freq);
+ return ret_freq;
}
EXPORT_SYMBOL(cpufreq_quick_get);
unsigned int ret_freq = 0;
if (!cpufreq_driver->get)
- return (ret_freq);
+ return ret_freq;
ret_freq = cpufreq_driver->get(cpu);
}
}
- return (ret_freq);
+ return ret_freq;
}
/**
out_policy:
cpufreq_cpu_put(policy);
out:
- return (ret_freq);
+ return ret_freq;
}
EXPORT_SYMBOL(cpufreq_get);
* cpufreq_suspend - let the low level driver prepare for suspend
*/
-static int cpufreq_suspend(struct sys_device * sysdev, pm_message_t pmsg)
+static int cpufreq_suspend(struct sys_device *sysdev, pm_message_t pmsg)
{
int cpu = sysdev->id;
int ret = 0;
return -EINVAL;
/* only handle each CPU group once */
- if (unlikely(cpu_policy->cpu != cpu)) {
- cpufreq_cpu_put(cpu_policy);
- return 0;
- }
+ if (unlikely(cpu_policy->cpu != cpu))
+ goto out;
if (cpufreq_driver->suspend) {
ret = cpufreq_driver->suspend(cpu_policy, pmsg);
if (ret) {
printk(KERN_ERR "cpufreq: suspend failed in ->suspend "
"step on CPU %u\n", cpu_policy->cpu);
- cpufreq_cpu_put(cpu_policy);
- return ret;
+ goto out;
}
}
-
if (cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)
goto out;
out:
cpufreq_cpu_put(cpu_policy);
- return 0;
+ return ret;
}
/**
* 3.) schedule call cpufreq_update_policy() ASAP as interrupts are
* restored.
*/
-static int cpufreq_resume(struct sys_device * sysdev)
+static int cpufreq_resume(struct sys_device *sysdev)
{
int cpu = sysdev->id;
int ret = 0;
return -EINVAL;
/* only handle each CPU group once */
- if (unlikely(cpu_policy->cpu != cpu)) {
- cpufreq_cpu_put(cpu_policy);
- return 0;
- }
+ if (unlikely(cpu_policy->cpu != cpu))
+ goto fail;
if (cpufreq_driver->resume) {
ret = cpufreq_driver->resume(cpu_policy);
if (ret) {
printk(KERN_ERR "cpufreq: resume failed in ->resume "
"step on CPU %u\n", cpu_policy->cpu);
- cpufreq_cpu_put(cpu_policy);
- return ret;
+ goto fail;
}
}
struct cpufreq_freqs freqs;
if (!(cpufreq_driver->flags & CPUFREQ_PM_NO_WARN))
- dprintk("Warning: CPU frequency"
+ dprintk("Warning: CPU frequency "
"is %u, cpufreq assumed %u kHz.\n",
cur_freq, cpu_policy->cur);
out:
schedule_work(&cpu_policy->update);
+fail:
cpufreq_cpu_put(cpu_policy);
return ret;
}
{
int ret;
+ WARN_ON(!init_cpufreq_transition_notifier_list_called);
+
switch (list) {
case CPUFREQ_TRANSITION_NOTIFIER:
ret = srcu_notifier_chain_register(
{
int ret;
+ /* Only must be defined when default governor is known to have latency
+ restrictions, like e.g. conservative or ondemand.
+ That this is the case is already ensured in Kconfig
+ */
+#ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE
+ struct cpufreq_governor *gov = &cpufreq_gov_performance;
+#else
+ struct cpufreq_governor *gov = NULL;
+#endif
+
+ 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);
+ policy->governor = gov;
+ }
+ }
+
if (!try_module_get(policy->governor->owner))
return -EINVAL;
memcpy(&policy->cpuinfo, &data->cpuinfo,
sizeof(struct cpufreq_cpuinfo));
- if (policy->min > data->min && policy->min > policy->max) {
+ if (policy->min > data->max || policy->max < data->min) {
ret = -EINVAL;
goto error_out;
}
}
/**
- * cpufreq_set_policy - set a new CPUFreq policy
- * @policy: policy to be set.
- *
- * Sets a new CPU frequency and voltage scaling policy.
- */
-int cpufreq_set_policy(struct cpufreq_policy *policy)
-{
- int ret = 0;
- struct cpufreq_policy *data;
-
- if (!policy)
- return -EINVAL;
-
- data = cpufreq_cpu_get(policy->cpu);
- if (!data)
- return -EINVAL;
-
- if (unlikely(lock_policy_rwsem_write(policy->cpu)))
- return -EINVAL;
-
-
- ret = __cpufreq_set_policy(data, policy);
- data->user_policy.min = data->min;
- data->user_policy.max = data->max;
- data->user_policy.policy = data->policy;
- data->user_policy.governor = data->governor;
-
- unlock_policy_rwsem_write(policy->cpu);
-
- cpufreq_cpu_put(data);
-
- return ret;
-}
-EXPORT_SYMBOL(cpufreq_set_policy);
-
-
-/**
* cpufreq_update_policy - re-evaluate an existing cpufreq policy
* @cpu: CPU which shall be re-evaluated
*
}
EXPORT_SYMBOL(cpufreq_update_policy);
-static int cpufreq_cpu_callback(struct notifier_block *nfb,
+static int __cpuinit cpufreq_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
unsigned int cpu = (unsigned long)hcpu;
struct sys_device *sys_dev;
- struct cpufreq_policy *policy;
sys_dev = get_cpu_sysdev(cpu);
if (sys_dev) {
switch (action) {
case CPU_ONLINE:
+ case CPU_ONLINE_FROZEN:
cpufreq_add_dev(sys_dev);
break;
case CPU_DOWN_PREPARE:
+ case CPU_DOWN_PREPARE_FROZEN:
if (unlikely(lock_policy_rwsem_write(cpu)))
BUG();
- policy = cpufreq_cpu_data[cpu];
- if (policy) {
- __cpufreq_driver_target(policy, policy->min,
- CPUFREQ_RELATION_H);
- }
__cpufreq_remove_dev(sys_dev);
break;
case CPU_DOWN_FAILED:
+ case CPU_DOWN_FAILED_FROZEN:
cpufreq_add_dev(sys_dev);
break;
}
return NOTIFY_OK;
}
-static struct notifier_block __cpuinitdata cpufreq_cpu_notifier =
+static struct notifier_block __refdata cpufreq_cpu_notifier =
{
.notifier_call = cpufreq_cpu_callback,
};
cpufreq_debug_enable_ratelimit();
}
- return (ret);
+ return ret;
}
EXPORT_SYMBOL_GPL(cpufreq_register_driver);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff