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authorKristen Carlson Accardi <kristen@linux.intel.com>2015-01-28 15:03:28 -0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-01-30 01:52:17 +0100
commit0522424ecb333c0874c4e74bc053dd662bed40df (patch)
tree2d04b3435d5b078c906a52272723546a8bc45545 /drivers/cpufreq
parentd01b1f48c5fd95901203bd830458eaf619ed6c47 (diff)
intel_pstate: Add num_pstates to sysfs
Add a sysfs interface to display the total number of supported pstates. This value is independent of whether turbo has been enabled or disabled. Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/intel_pstate.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index ed6dd7dac094..80ecc351d613 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -354,6 +354,17 @@ static ssize_t show_turbo_pct(struct kobject *kobj,
return sprintf(buf, "%u\n", turbo_pct);
}
+static ssize_t show_num_pstates(struct kobject *kobj,
+ struct attribute *attr, char *buf)
+{
+ struct cpudata *cpu;
+ int total;
+
+ cpu = all_cpu_data[0];
+ total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1;
+ return sprintf(buf, "%u\n", total);
+}
+
static ssize_t show_no_turbo(struct kobject *kobj,
struct attribute *attr, char *buf)
{
@@ -435,12 +446,14 @@ define_one_global_rw(no_turbo);
define_one_global_rw(max_perf_pct);
define_one_global_rw(min_perf_pct);
define_one_global_ro(turbo_pct);
+define_one_global_ro(num_pstates);
static struct attribute *intel_pstate_attributes[] = {
&no_turbo.attr,
&max_perf_pct.attr,
&min_perf_pct.attr,
&turbo_pct.attr,
+ &num_pstates.attr,
NULL
};