diff options
Diffstat (limited to 'drivers/cpufreq/cpufreq.c')
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 50 |
1 files changed, 37 insertions, 13 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index ff57c40e9b8..67bc2ece7b4 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -64,14 +64,14 @@ static DEFINE_SPINLOCK(cpufreq_driver_lock); * - Lock should not be held across * __cpufreq_governor(data, CPUFREQ_GOV_STOP); */ -static DEFINE_PER_CPU(int, policy_cpu); +static DEFINE_PER_CPU(int, cpufreq_policy_cpu); static DEFINE_PER_CPU(struct rw_semaphore, cpu_policy_rwsem); #define lock_policy_rwsem(mode, cpu) \ int lock_policy_rwsem_##mode \ (int cpu) \ { \ - int policy_cpu = per_cpu(policy_cpu, cpu); \ + int policy_cpu = per_cpu(cpufreq_policy_cpu, cpu); \ BUG_ON(policy_cpu == -1); \ down_##mode(&per_cpu(cpu_policy_rwsem, policy_cpu)); \ if (unlikely(!cpu_online(cpu))) { \ @@ -90,7 +90,7 @@ EXPORT_SYMBOL_GPL(lock_policy_rwsem_write); void unlock_policy_rwsem_read(int cpu) { - int policy_cpu = per_cpu(policy_cpu, cpu); + int policy_cpu = per_cpu(cpufreq_policy_cpu, cpu); BUG_ON(policy_cpu == -1); up_read(&per_cpu(cpu_policy_rwsem, policy_cpu)); } @@ -98,7 +98,7 @@ EXPORT_SYMBOL_GPL(unlock_policy_rwsem_read); void unlock_policy_rwsem_write(int cpu) { - int policy_cpu = per_cpu(policy_cpu, cpu); + int policy_cpu = per_cpu(cpufreq_policy_cpu, cpu); BUG_ON(policy_cpu == -1); up_write(&per_cpu(cpu_policy_rwsem, policy_cpu)); } @@ -647,6 +647,21 @@ static ssize_t show_scaling_setspeed(struct cpufreq_policy *policy, char *buf) return policy->governor->show_setspeed(policy, buf); } +/** + * show_scaling_driver - show the current cpufreq HW/BIOS limitation + */ +static ssize_t show_bios_limit(struct cpufreq_policy *policy, char *buf) +{ + unsigned int limit; + int ret; + if (cpufreq_driver->bios_limit) { + ret = cpufreq_driver->bios_limit(policy->cpu, &limit); + if (!ret) + return sprintf(buf, "%u\n", limit); + } + return sprintf(buf, "%u\n", policy->cpuinfo.max_freq); +} + #define define_one_ro(_name) \ static struct freq_attr _name = \ __ATTR(_name, 0444, show_##_name, NULL) @@ -666,6 +681,7 @@ define_one_ro(cpuinfo_transition_latency); define_one_ro(scaling_available_governors); define_one_ro(scaling_driver); define_one_ro(scaling_cur_freq); +define_one_ro(bios_limit); define_one_ro(related_cpus); define_one_ro(affected_cpus); define_one_rw(scaling_min_freq); @@ -767,8 +783,9 @@ static struct kobj_type ktype_cpufreq = { * 0: Success * Positive: When we have a managed CPU and the sysfs got symlinked */ -int cpufreq_add_dev_policy(unsigned int cpu, struct cpufreq_policy *policy, - struct sys_device *sys_dev) +static int cpufreq_add_dev_policy(unsigned int cpu, + struct cpufreq_policy *policy, + struct sys_device *sys_dev) { int ret = 0; #ifdef CONFIG_SMP @@ -801,7 +818,7 @@ int cpufreq_add_dev_policy(unsigned int cpu, struct cpufreq_policy *policy, /* Set proper policy_cpu */ unlock_policy_rwsem_write(cpu); - per_cpu(policy_cpu, cpu) = managed_policy->cpu; + per_cpu(cpufreq_policy_cpu, cpu) = managed_policy->cpu; if (lock_policy_rwsem_write(cpu) < 0) { /* Should not go through policy unlock path */ @@ -842,7 +859,8 @@ int cpufreq_add_dev_policy(unsigned int cpu, struct cpufreq_policy *policy, /* symlink affected CPUs */ -int cpufreq_add_dev_symlink(unsigned int cpu, struct cpufreq_policy *policy) +static int cpufreq_add_dev_symlink(unsigned int cpu, + struct cpufreq_policy *policy) { unsigned int j; int ret = 0; @@ -869,8 +887,9 @@ int cpufreq_add_dev_symlink(unsigned int cpu, struct cpufreq_policy *policy) return ret; } -int cpufreq_add_dev_interface(unsigned int cpu, struct cpufreq_policy *policy, - struct sys_device *sys_dev) +static 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; @@ -902,13 +921,18 @@ int cpufreq_add_dev_interface(unsigned int cpu, struct cpufreq_policy *policy, if (ret) goto err_out_kobj_put; } + if (cpufreq_driver->bios_limit) { + ret = sysfs_create_file(&policy->kobj, &bios_limit.attr); + if (ret) + goto err_out_kobj_put; + } spin_lock_irqsave(&cpufreq_driver_lock, flags); for_each_cpu(j, policy->cpus) { if (!cpu_online(j)) continue; per_cpu(cpufreq_cpu_data, j) = policy; - per_cpu(policy_cpu, j) = policy->cpu; + per_cpu(cpufreq_policy_cpu, j) = policy->cpu; } spin_unlock_irqrestore(&cpufreq_driver_lock, flags); @@ -996,7 +1020,7 @@ static int cpufreq_add_dev(struct sys_device *sys_dev) cpumask_copy(policy->cpus, cpumask_of(cpu)); /* Initially set CPU itself as the policy_cpu */ - per_cpu(policy_cpu, cpu) = cpu; + per_cpu(cpufreq_policy_cpu, cpu) = cpu; ret = (lock_policy_rwsem_write(cpu) < 0); WARN_ON(ret); @@ -1978,7 +2002,7 @@ static int __init cpufreq_core_init(void) int cpu; for_each_possible_cpu(cpu) { - per_cpu(policy_cpu, cpu) = -1; + per_cpu(cpufreq_policy_cpu, cpu) = -1; init_rwsem(&per_cpu(cpu_policy_rwsem, cpu)); } |