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[CPUFREQ] Factor out policy setting from cpufreq_add_dev

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Signed-off-by: Dave Jones <davej@redhat.com>
This commit is contained in:
Dave Jones 2009-07-08 18:48:47 -04:00
parent 909a694e33
commit ecf7e4611c
1 changed files with 90 additions and 76 deletions
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166
drivers/cpufreq/cpufreq.c
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@ -756,6 +756,75 @@ static struct kobj_type ktype_cpufreq = {
.release = cpufreq_sysfs_release,
};
int cpufreq_add_dev_policy(unsigned int cpu, struct cpufreq_policy *policy,
struct sys_device *sys_dev)
{
int ret = 0;
#ifdef CONFIG_SMP
unsigned long flags;
unsigned int j;
#ifdef CONFIG_HOTPLUG_CPU
if (per_cpu(cpufreq_cpu_governor, cpu)) {
policy->governor = per_cpu(cpufreq_cpu_governor, cpu);
dprintk("Restoring governor %s for cpu %d\n",
policy->governor->name, cpu);
}
#endif
for_each_cpu(j, policy->cpus) {
struct cpufreq_policy *managed_policy;
if (cpu == j)
continue;
/* Check for existing affected CPUs.
* They may not be aware of it due to CPU Hotplug.
* cpufreq_cpu_put is called when the device is removed
* in __cpufreq_remove_dev()
*/
managed_policy = cpufreq_cpu_get(j);
if (unlikely(managed_policy)) {
/* Set proper policy_cpu */
unlock_policy_rwsem_write(cpu);
per_cpu(policy_cpu, cpu) = managed_policy->cpu;
if (lock_policy_rwsem_write(cpu) < 0) {
/* Should not go through policy unlock path */
if (cpufreq_driver->exit)
cpufreq_driver->exit(policy);
cpufreq_cpu_put(managed_policy);
return -EBUSY;
}
spin_lock_irqsave(&cpufreq_driver_lock, flags);
cpumask_copy(managed_policy->cpus, policy->cpus);
per_cpu(cpufreq_cpu_data, cpu) = managed_policy;
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
dprintk("CPU already managed, adding link\n");
ret = sysfs_create_link(&sys_dev->kobj,
&managed_policy->kobj,
"cpufreq");
if (ret)
cpufreq_cpu_put(managed_policy);
/*
* Success. We only needed to be added to the mask.
* Call driver->exit() because only the cpu parent of
* the kobj needed to call init().
*/
if (cpufreq_driver->exit)
cpufreq_driver->exit(policy);
return ret;
}
}
#endif
return ret;
}
/* symlink affected CPUs */
int cpufreq_add_dev_symlink(unsigned int cpu, struct cpufreq_policy *policy)
{
@ -787,6 +856,7 @@ int cpufreq_add_dev_symlink(unsigned int cpu, struct cpufreq_policy *policy)
int cpufreq_add_dev_interface(unsigned int cpu, struct cpufreq_policy *policy,
struct sys_device *sys_dev)
{
struct cpufreq_policy new_policy;
struct freq_attr **drv_attr;
unsigned long flags;
int ret = 0;
@ -827,6 +897,23 @@ int cpufreq_add_dev_interface(unsigned int cpu, struct cpufreq_policy *policy,
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
ret = cpufreq_add_dev_symlink(cpu, policy);
if (ret)
goto err_out_kobj_put;
memcpy(&new_policy, policy, sizeof(struct cpufreq_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;
if (ret) {
dprintk("setting policy failed\n");
if (cpufreq_driver->exit)
cpufreq_driver->exit(policy);
}
return ret;
err_out_kobj_put:
@ -849,7 +936,6 @@ static int cpufreq_add_dev(struct sys_device *sys_dev)
{
unsigned int cpu = sys_dev->id;
int ret = 0;
struct cpufreq_policy new_policy;
struct cpufreq_policy *policy;
unsigned long flags;
unsigned int j;
@ -914,82 +1000,14 @@ static int cpufreq_add_dev(struct sys_device *sys_dev)
blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
CPUFREQ_START, policy);
#ifdef CONFIG_SMP
#ifdef CONFIG_HOTPLUG_CPU
if (per_cpu(cpufreq_cpu_governor, cpu)) {
policy->governor = per_cpu(cpufreq_cpu_governor, cpu);
dprintk("Restoring governor %s for cpu %d\n",
policy->governor->name, cpu);
}
#endif
for_each_cpu(j, policy->cpus) {
struct cpufreq_policy *managed_policy;
if (cpu == j)
continue;
/* Check for existing affected CPUs.
* They may not be aware of it due to CPU Hotplug.
* cpufreq_cpu_put is called when the device is removed
* in __cpufreq_remove_dev()
*/
managed_policy = cpufreq_cpu_get(j);
if (unlikely(managed_policy)) {
/* Set proper policy_cpu */
unlock_policy_rwsem_write(cpu);
per_cpu(policy_cpu, cpu) = managed_policy->cpu;
if (lock_policy_rwsem_write(cpu) < 0) {
/* Should not go through policy unlock path */
if (cpufreq_driver->exit)
cpufreq_driver->exit(policy);
ret = -EBUSY;
cpufreq_cpu_put(managed_policy);
goto err_free_cpumask;
}
spin_lock_irqsave(&cpufreq_driver_lock, flags);
cpumask_copy(managed_policy->cpus, policy->cpus);
per_cpu(cpufreq_cpu_data, cpu) = managed_policy;
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
dprintk("CPU already managed, adding link\n");
ret = sysfs_create_link(&sys_dev->kobj,
&managed_policy->kobj,
"cpufreq");
if (ret)
cpufreq_cpu_put(managed_policy);
/*
* Success. We only needed to be added to the mask.
* Call driver->exit() because only the cpu parent of
* the kobj needed to call init().
*/
goto out_driver_exit; /* call driver->exit() */
}
}
#endif
memcpy(&new_policy, policy, sizeof(struct cpufreq_policy));
ret = cpufreq_add_dev_policy(cpu, policy, sys_dev);
if (ret)
goto err_unlock_policy;
ret = cpufreq_add_dev_interface(cpu, policy, sys_dev);
if (ret)
goto err_out_unregister;
policy->governor = NULL; /* to assure that the starting sequence is
* run in cpufreq_set_policy */
/* set default 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);
@ -1009,10 +1027,6 @@ err_out_unregister:
kobject_put(&policy->kobj);
wait_for_completion(&policy->kobj_unregister);
out_driver_exit:
if (cpufreq_driver->exit)
cpufreq_driver->exit(policy);
err_unlock_policy:
unlock_policy_rwsem_write(cpu);
err_free_cpumask: