This layer provides Energy Aware Scheduling (EAS) patcheseel_5.1.0eel_5.0.3eel_5.0.2eel/5.1.0eel/5.0.3eel/5.0.25.1.05.0.35.0.2eel

For the moment only for Renesas R-Car Gen3 SoC's.
Can be expanded for other SoC's by setting the machine
feature biglittle and provide the relevant EAS patches.

Bug-AGL: SPEC-813

Change-Id: I2b5e69c515c33e57be19b30466fe208d7b8ac1a5
Signed-off-by: Frode Isaksen <fisaksen@baylibre.com>

1 files changed, 127 insertions, 0 deletions

diff --git a/meta-eas/recipes-kernel/linux/linux-renesas/0031-arm-add-sysfs-cpu_capacity-attribute.patch b/meta-eas/recipes-kernel/linux/linux-renesas/0031-arm-add-sysfs-cpu_capacity-attribute.patch
new file mode 100644
index 0000000..03c46e3
--- /dev/null
+++ b/meta-eas/recipes-kernel/linux/linux-renesas/0031-arm-add-sysfs-cpu_capacity-attribute.patch
@@ -0,0 +1,127 @@
+From cecbf11db6cfccccc7019e2aeec37ead5d8b8a03 Mon Sep 17 00:00:00 2001
+From: Juri Lelli <juri.lelli@arm.com>
+Date: Thu, 15 Oct 2015 13:53:37 +0100
+Subject: [PATCH 31/92] arm: add sysfs cpu_capacity attribute
+
+Add a sysfs cpu_capacity attribute with which it is possible to read and
+write (thus over-writing default values) CPUs capacity. This might be
+useful in situations where values needs changing after boot.
+
+The new attribute shows up as:
+
+ /sys/devices/system/cpu/cpu*/cpu_capacity
+
+Cc: Russell King <linux@arm.linux.org.uk>
+Signed-off-by: Juri Lelli <juri.lelli@arm.com>
+---
+ arch/arm/kernel/topology.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 73 insertions(+)
+
+diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
+index a26e787..e79ac85 100644
+--- a/arch/arm/kernel/topology.c
++++ b/arch/arm/kernel/topology.c
+@@ -41,6 +41,7 @@
+  * updated during this sequence.
+  */
+ static DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE;
++static DEFINE_MUTEX(cpu_scale_mutex);
+ 
+ unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu)
+ {
+@@ -52,6 +53,76 @@ static void set_capacity_scale(unsigned int cpu, unsigned long capacity)
+ 	per_cpu(cpu_scale, cpu) = capacity;
+ }
+ 
++#ifdef CONFIG_PROC_SYSCTL
++#include <asm/cpu.h>
++#include <linux/string.h>
++static ssize_t show_cpu_capacity(struct device *dev,
++				 struct device_attribute *attr,
++				 char *buf)
++{
++	struct cpu *cpu = container_of(dev, struct cpu, dev);
++	ssize_t rc;
++	int cpunum = cpu->dev.id;
++	unsigned long capacity = arch_scale_cpu_capacity(NULL, cpunum);
++
++	rc = sprintf(buf, "%lu\n", capacity);
++
++	return rc;
++}
++
++static ssize_t store_cpu_capacity(struct device *dev,
++				  struct device_attribute *attr,
++				  const char *buf,
++				  size_t count)
++{
++	struct cpu *cpu = container_of(dev, struct cpu, dev);
++	int this_cpu = cpu->dev.id, i;
++	unsigned long new_capacity;
++	ssize_t ret;
++
++	if (count) {
++		char *p = (char *) buf;
++
++		ret = kstrtoul(p, 0, &new_capacity);
++		if (ret)
++			return ret;
++		if (new_capacity > SCHED_CAPACITY_SCALE)
++			return -EINVAL;
++
++		mutex_lock(&cpu_scale_mutex);
++		for_each_cpu(i, &cpu_topology[this_cpu].core_sibling)
++			set_capacity_scale(i, new_capacity);
++		mutex_unlock(&cpu_scale_mutex);
++	}
++
++	return count;
++}
++
++static DEVICE_ATTR(cpu_capacity,
++		   0644,
++		   show_cpu_capacity,
++		   store_cpu_capacity);
++
++static int register_cpu_capacity_sysctl(void)
++{
++	int i;
++	struct device *cpu;
++
++	for_each_possible_cpu(i) {
++		cpu = get_cpu_device(i);
++		if (!cpu) {
++			pr_err("%s: too early to get CPU%d device!\n",
++			       __func__, i);
++			continue;
++		}
++		device_create_file(cpu, &dev_attr_cpu_capacity);
++	}
++
++	return 0;
++}
++late_initcall(register_cpu_capacity_sysctl);
++#endif
++
+ #ifdef CONFIG_OF
+ struct cpu_efficiency {
+ 	const char *compatible;
+@@ -131,6 +202,7 @@ static void normalize_cpu_capacity(void)
+ 		return;
+ 
+ 	pr_debug("cpu_capacity: capacity_scale=%u\n", capacity_scale);
++	mutex_lock(&cpu_scale_mutex);
+ 	for_each_possible_cpu(cpu) {
+ 		capacity = (raw_capacity[cpu] << SCHED_CAPACITY_SHIFT)
+ 			/ capacity_scale;
+@@ -138,6 +210,7 @@ static void normalize_cpu_capacity(void)
+ 		pr_debug("cpu_capacity: CPU%d cpu_capacity=%lu\n",
+ 			cpu, arch_scale_cpu_capacity(NULL, cpu));
+ 	}
++	mutex_unlock(&cpu_scale_mutex);
+ }
+ 
+ #ifdef CONFIG_CPU_FREQ
+-- 
+1.9.1
+