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) {