sched: Add tunables for static cpu and cluster cost

Add per-cpu tunable to set the extra cost to use a CPU that is idle.
Add the same for a cluster.

Change-Id: I4aa53f3c42c963df7abc7480980f747f0413d389
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
[joonwoop@codeaurora.org: omitted changes for qhmp*.[c,h]  stripped out
 CONFIG_SCHED_QHMP in drivers/base/cpu.c and include/linux/sched.h]
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>

1 files changed, 99 insertions, 0 deletions

diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index 91bbb1959d8d..dee022638fe6 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -180,10 +180,106 @@ static struct attribute_group crash_note_cpu_attr_group = {
 };
 #endif
 
+#ifdef CONFIG_SCHED_HMP
+
+static ssize_t show_sched_static_cpu_pwr_cost(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct cpu *cpu = container_of(dev, struct cpu, dev);
+	ssize_t rc;
+	int cpuid = cpu->dev.id;
+	unsigned int pwr_cost;
+
+	pwr_cost = sched_get_static_cpu_pwr_cost(cpuid);
+
+	rc = snprintf(buf, PAGE_SIZE-2, "%d\n", pwr_cost);
+
+	return rc;
+}
+
+static ssize_t __ref store_sched_static_cpu_pwr_cost(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t count)
+{
+	struct cpu *cpu = container_of(dev, struct cpu, dev);
+	int err;
+	int cpuid = cpu->dev.id;
+	unsigned int pwr_cost;
+
+	err = kstrtouint(strstrip((char *)buf), 0, &pwr_cost);
+	if (err)
+		return err;
+
+	err = sched_set_static_cpu_pwr_cost(cpuid, pwr_cost);
+
+	if (err >= 0)
+		err = count;
+
+	return err;
+}
+
+static ssize_t show_sched_static_cluster_pwr_cost(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct cpu *cpu = container_of(dev, struct cpu, dev);
+	ssize_t rc;
+	int cpuid = cpu->dev.id;
+	unsigned int pwr_cost;
+
+	pwr_cost = sched_get_static_cluster_pwr_cost(cpuid);
+
+	rc = snprintf(buf, PAGE_SIZE-2, "%d\n", pwr_cost);
+
+	return rc;
+}
+
+static ssize_t __ref store_sched_static_cluster_pwr_cost(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t count)
+{
+	struct cpu *cpu = container_of(dev, struct cpu, dev);
+	int err;
+	int cpuid = cpu->dev.id;
+	unsigned int pwr_cost;
+
+	err = kstrtouint(strstrip((char *)buf), 0, &pwr_cost);
+	if (err)
+		return err;
+
+	err = sched_set_static_cluster_pwr_cost(cpuid, pwr_cost);
+
+	if (err >= 0)
+		err = count;
+
+	return err;
+}
+
+static DEVICE_ATTR(sched_static_cpu_pwr_cost, 0644,
+					show_sched_static_cpu_pwr_cost,
+					store_sched_static_cpu_pwr_cost);
+static DEVICE_ATTR(sched_static_cluster_pwr_cost, 0644,
+					show_sched_static_cluster_pwr_cost,
+					store_sched_static_cluster_pwr_cost);
+
+static struct attribute *hmp_sched_cpu_attrs[] = {
+	&dev_attr_sched_static_cpu_pwr_cost.attr,
+	&dev_attr_sched_static_cluster_pwr_cost.attr,
+	NULL
+};
+
+static struct attribute_group sched_hmp_cpu_attr_group = {
+	.attrs = hmp_sched_cpu_attrs,
+};
+
+#endif /* CONFIG_SCHED_HMP */
+
 static const struct attribute_group *common_cpu_attr_groups[] = {
 #ifdef CONFIG_KEXEC
 	&crash_note_cpu_attr_group,
 #endif
+#ifdef CONFIG_SCHED_HMP
+	&sched_hmp_cpu_attr_group,
+#endif
 	NULL
 };
 
@@ -191,6 +287,9 @@ static const struct attribute_group *hotplugable_cpu_attr_groups[] = {
 #ifdef CONFIG_KEXEC
 	&crash_note_cpu_attr_group,
 #endif
+#ifdef CONFIG_SCHED_HMP
+	&sched_hmp_cpu_attr_group,
+#endif
 	NULL
 };