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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
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