diff options
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 166 |
1 files changed, 90 insertions, 76 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 0ee008da46f2..845687884c1e 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -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: |