[PATCH 0/2] sysfs additions for intel_pstate

[PATCH 0/2] sysfs additions for intel_pstate

[Kristen Carlson Accardi]

Add sysfs interface to expose hardware turbo information to user space.

Kristen Carlson Accardi (2):
  intel_pstate: expose turbo range to sysfs
  intel_pstate: Add num_pstates to sysfs

 Documentation/cpu-freq/intel-pstate.txt |  8 ++++++++
 drivers/cpufreq/intel_pstate.c          | 31 +++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+)

-- 
1.9.3

[PATCH 1/2] intel_pstate: expose turbo range to sysfs

[Kristen Carlson Accardi]

This patch adds "turbo_pct" to the intel_pstate sysfs interface.
turbo_pct will display the percentage of the total supported
pstates that are in the turbo range.  This value is independent
of whether turbo has been disabled or not.

Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com>
---
 Documentation/cpu-freq/intel-pstate.txt |  4 ++++
 drivers/cpufreq/intel_pstate.c          | 18 ++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/Documentation/cpu-freq/intel-pstate.txt b/Documentation/cpu-freq/intel-pstate.txt
index 765d7fc..7767ce6 100644
--- a/Documentation/cpu-freq/intel-pstate.txt
+++ b/Documentation/cpu-freq/intel-pstate.txt
@@ -37,6 +37,10 @@ controlling P state selection. These files have been added to
       no_turbo: limits the driver to selecting P states below the turbo
       frequency range.
 
+      turbo_pct: displays the percentage of the total performance that
+      is supported by hardware that is in the turbo range.  This number
+      is independent of whether turbo has been disabled or not.
+
 For contemporary Intel processors, the frequency is controlled by the
 processor itself and the P-states exposed to software are related to
 performance levels.  The idea that frequency can be set to a single
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 742eefb..f558c2e 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -338,6 +338,22 @@ static void __init intel_pstate_debug_expose_params(void)
 		return sprintf(buf, "%u\n", limits.object);		\
 	}
 
+static ssize_t show_turbo_pct(struct kobject *kobj,
+				struct attribute *attr, char *buf)
+{
+	struct cpudata *cpu;
+	int total, no_turbo, turbo_pct;
+	uint32_t turbo_fp;
+
+	cpu = all_cpu_data[0];
+
+	total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1;
+	no_turbo = cpu->pstate.max_pstate - cpu->pstate.min_pstate + 1;
+	turbo_fp = div_fp(int_tofp(no_turbo), int_tofp(total));
+	turbo_pct = 100 - fp_toint(mul_fp(turbo_fp, int_tofp(100)));
+	return sprintf(buf, "%u\n", turbo_pct);
+}
+
 static ssize_t show_no_turbo(struct kobject *kobj,
 			     struct attribute *attr, char *buf)
 {
@@ -418,11 +434,13 @@ show_one(min_perf_pct, min_perf_pct);
 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);
 
 static struct attribute *intel_pstate_attributes[] = {
 	&no_turbo.attr,
 	&max_perf_pct.attr,
 	&min_perf_pct.attr,
+	&turbo_pct.attr,
 	NULL
 };
 
-- 
1.9.3

[PATCH 2/2] intel_pstate: Add num_pstates to sysfs

[Kristen Carlson Accardi]

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>
---
 Documentation/cpu-freq/intel-pstate.txt |  4 ++++
 drivers/cpufreq/intel_pstate.c          | 13 +++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/Documentation/cpu-freq/intel-pstate.txt b/Documentation/cpu-freq/intel-pstate.txt
index 7767ce6..6557507 100644
--- a/Documentation/cpu-freq/intel-pstate.txt
+++ b/Documentation/cpu-freq/intel-pstate.txt
@@ -41,6 +41,10 @@ controlling P state selection. These files have been added to
       is supported by hardware that is in the turbo range.  This number
       is independent of whether turbo has been disabled or not.
 
+      num_pstates: displays the number of pstates that are supported
+      by hardware.  This number is independent of whether turbo has
+      been disabled or not.
+
 For contemporary Intel processors, the frequency is controlled by the
 processor itself and the P-states exposed to software are related to
 performance levels.  The idea that frequency can be set to a single
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index f558c2e..3ea9aff 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
 };
 
-- 
1.9.3