diff options
Diffstat (limited to 'drivers/cpufreq/cpufreq.c')
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 34 |
1 files changed, 29 insertions, 5 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index ff57c40e9b8b..f20668c09ce0 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -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 @@ -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; @@ -902,6 +921,11 @@ 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) { |