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-rw-r--r--drivers/cpufreq/Kconfig5
-rw-r--r--drivers/cpufreq/Kconfig.arm7
-rw-r--r--drivers/cpufreq/Kconfig.x862
-rw-r--r--drivers/cpufreq/Makefile2
-rw-r--r--drivers/cpufreq/acpi-cpufreq.c7
-rw-r--r--drivers/cpufreq/cpufreq-cpu0.c7
-rw-r--r--drivers/cpufreq/cpufreq.c37
-rw-r--r--drivers/cpufreq/cpufreq_conservative.c558
-rw-r--r--drivers/cpufreq/cpufreq_governor.c318
-rw-r--r--drivers/cpufreq/cpufreq_governor.h176
-rw-r--r--drivers/cpufreq/cpufreq_ondemand.c731
-rw-r--r--drivers/cpufreq/cpufreq_performance.c2
-rw-r--r--drivers/cpufreq/cpufreq_powersave.c2
-rw-r--r--drivers/cpufreq/cpufreq_stats.c15
-rw-r--r--drivers/cpufreq/cpufreq_userspace.c2
-rw-r--r--drivers/cpufreq/db8500-cpufreq.c101
-rw-r--r--drivers/cpufreq/exynos-cpufreq.c11
-rw-r--r--drivers/cpufreq/freq_table.c2
-rw-r--r--drivers/cpufreq/longhaul.c14
-rw-r--r--drivers/cpufreq/omap-cpufreq.c3
-rw-r--r--drivers/cpufreq/powernow-k8.c6
-rw-r--r--drivers/cpufreq/spear-cpufreq.c291
22 files changed, 1311 insertions, 988 deletions
diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
index ea512f47b78..e0a899f25e3 100644
--- a/drivers/cpufreq/Kconfig
+++ b/drivers/cpufreq/Kconfig
@@ -20,6 +20,9 @@ if CPU_FREQ
config CPU_FREQ_TABLE
tristate
+config CPU_FREQ_GOV_COMMON
+ bool
+
config CPU_FREQ_STAT
tristate "CPU frequency translation statistics"
select CPU_FREQ_TABLE
@@ -141,6 +144,7 @@ config CPU_FREQ_GOV_USERSPACE
config CPU_FREQ_GOV_ONDEMAND
tristate "'ondemand' cpufreq policy governor"
select CPU_FREQ_TABLE
+ select CPU_FREQ_GOV_COMMON
help
'ondemand' - This driver adds a dynamic cpufreq policy governor.
The governor does a periodic polling and
@@ -159,6 +163,7 @@ config CPU_FREQ_GOV_ONDEMAND
config CPU_FREQ_GOV_CONSERVATIVE
tristate "'conservative' cpufreq governor"
depends on CPU_FREQ
+ select CPU_FREQ_GOV_COMMON
help
'conservative' - this driver is rather similar to the 'ondemand'
governor both in its source code and its purpose, the difference is
diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
index 5961e6415f0..a0b3661d90b 100644
--- a/drivers/cpufreq/Kconfig.arm
+++ b/drivers/cpufreq/Kconfig.arm
@@ -76,3 +76,10 @@ config ARM_EXYNOS5250_CPUFREQ
help
This adds the CPUFreq driver for Samsung EXYNOS5250
SoC.
+
+config ARM_SPEAR_CPUFREQ
+ bool "SPEAr CPUFreq support"
+ depends on PLAT_SPEAR
+ default y
+ help
+ This adds the CPUFreq driver support for SPEAr SOCs.
diff --git a/drivers/cpufreq/Kconfig.x86 b/drivers/cpufreq/Kconfig.x86
index 934854ae5eb..7227cd73404 100644
--- a/drivers/cpufreq/Kconfig.x86
+++ b/drivers/cpufreq/Kconfig.x86
@@ -106,7 +106,7 @@ config X86_POWERNOW_K7_ACPI
config X86_POWERNOW_K8
tristate "AMD Opteron/Athlon64 PowerNow!"
select CPU_FREQ_TABLE
- depends on ACPI && ACPI_PROCESSOR
+ depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ
help
This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
Support for K10 and newer processors is now in acpi-cpufreq.
diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
index 1bc90e1306d..fadc4d496e2 100644
--- a/drivers/cpufreq/Makefile
+++ b/drivers/cpufreq/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_CPU_FREQ_GOV_POWERSAVE) += cpufreq_powersave.o
obj-$(CONFIG_CPU_FREQ_GOV_USERSPACE) += cpufreq_userspace.o
obj-$(CONFIG_CPU_FREQ_GOV_ONDEMAND) += cpufreq_ondemand.o
obj-$(CONFIG_CPU_FREQ_GOV_CONSERVATIVE) += cpufreq_conservative.o
+obj-$(CONFIG_CPU_FREQ_GOV_COMMON) += cpufreq_governor.o
# CPUfreq cross-arch helpers
obj-$(CONFIG_CPU_FREQ_TABLE) += freq_table.o
@@ -50,6 +51,7 @@ obj-$(CONFIG_ARM_EXYNOS4210_CPUFREQ) += exynos4210-cpufreq.o
obj-$(CONFIG_ARM_EXYNOS4X12_CPUFREQ) += exynos4x12-cpufreq.o
obj-$(CONFIG_ARM_EXYNOS5250_CPUFREQ) += exynos5250-cpufreq.o
obj-$(CONFIG_ARM_OMAP2PLUS_CPUFREQ) += omap-cpufreq.o
+obj-$(CONFIG_ARM_SPEAR_CPUFREQ) += spear-cpufreq.o
##################################################################################
# PowerPC platform drivers
diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
index 0d048f6a2b2..7b0d49d78c6 100644
--- a/drivers/cpufreq/acpi-cpufreq.c
+++ b/drivers/cpufreq/acpi-cpufreq.c
@@ -1030,4 +1030,11 @@ MODULE_PARM_DESC(acpi_pstate_strict,
late_initcall(acpi_cpufreq_init);
module_exit(acpi_cpufreq_exit);
+static const struct x86_cpu_id acpi_cpufreq_ids[] = {
+ X86_FEATURE_MATCH(X86_FEATURE_ACPI),
+ X86_FEATURE_MATCH(X86_FEATURE_HW_PSTATE),
+ {}
+};
+MODULE_DEVICE_TABLE(x86cpu, acpi_cpufreq_ids);
+
MODULE_ALIAS("acpi");
diff --git a/drivers/cpufreq/cpufreq-cpu0.c b/drivers/cpufreq/cpufreq-cpu0.c
index e9158278c71..debc5a7c8db 100644
--- a/drivers/cpufreq/cpufreq-cpu0.c
+++ b/drivers/cpufreq/cpufreq-cpu0.c
@@ -71,12 +71,15 @@ static int cpu0_set_target(struct cpufreq_policy *policy,
}
if (cpu_reg) {
+ rcu_read_lock();
opp = opp_find_freq_ceil(cpu_dev, &freq_Hz);
if (IS_ERR(opp)) {
+ rcu_read_unlock();
pr_err("failed to find OPP for %ld\n", freq_Hz);
return PTR_ERR(opp);
}
volt = opp_get_voltage(opp);
+ rcu_read_unlock();
tol = volt * voltage_tolerance / 100;
volt_old = regulator_get_voltage(cpu_reg);
}
@@ -174,7 +177,7 @@ static struct cpufreq_driver cpu0_cpufreq_driver = {
.attr = cpu0_cpufreq_attr,
};
-static int __devinit cpu0_cpufreq_driver_init(void)
+static int cpu0_cpufreq_driver_init(void)
{
struct device_node *np;
int ret;
@@ -236,12 +239,14 @@ static int __devinit cpu0_cpufreq_driver_init(void)
*/
for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++)
;
+ rcu_read_lock();
opp = opp_find_freq_exact(cpu_dev,
freq_table[0].frequency * 1000, true);
min_uV = opp_get_voltage(opp);
opp = opp_find_freq_exact(cpu_dev,
freq_table[i-1].frequency * 1000, true);
max_uV = opp_get_voltage(opp);
+ rcu_read_unlock();
ret = regulator_set_voltage_time(cpu_reg, min_uV, max_uV);
if (ret > 0)
transition_latency += ret * 1000;
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index fb8a5279c5d..1f93dbd7235 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -15,6 +15,8 @@
*
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
@@ -127,7 +129,7 @@ static int __init init_cpufreq_transition_notifier_list(void)
pure_initcall(init_cpufreq_transition_notifier_list);
static int off __read_mostly;
-int cpufreq_disabled(void)
+static int cpufreq_disabled(void)
{
return off;
}
@@ -402,7 +404,7 @@ static int __cpufreq_set_policy(struct cpufreq_policy *data,
static ssize_t store_##file_name \
(struct cpufreq_policy *policy, const char *buf, size_t count) \
{ \
- unsigned int ret = -EINVAL; \
+ unsigned int ret; \
struct cpufreq_policy new_policy; \
\
ret = cpufreq_get_policy(&new_policy, policy->cpu); \
@@ -445,7 +447,7 @@ static ssize_t show_scaling_governor(struct cpufreq_policy *policy, char *buf)
else if (policy->policy == CPUFREQ_POLICY_PERFORMANCE)
return sprintf(buf, "performance\n");
else if (policy->governor)
- return scnprintf(buf, CPUFREQ_NAME_LEN, "%s\n",
+ return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n",
policy->governor->name);
return -EINVAL;
}
@@ -457,7 +459,7 @@ static ssize_t show_scaling_governor(struct cpufreq_policy *policy, char *buf)
static ssize_t store_scaling_governor(struct cpufreq_policy *policy,
const char *buf, size_t count)
{
- unsigned int ret = -EINVAL;
+ unsigned int ret;
char str_governor[16];
struct cpufreq_policy new_policy;
@@ -491,7 +493,7 @@ static ssize_t store_scaling_governor(struct cpufreq_policy *policy,
*/
static ssize_t show_scaling_driver(struct cpufreq_policy *policy, char *buf)
{
- return scnprintf(buf, CPUFREQ_NAME_LEN, "%s\n", cpufreq_driver->name);
+ return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", cpufreq_driver->name);
}
/**
@@ -512,7 +514,7 @@ static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy,
if (i >= (ssize_t) ((PAGE_SIZE / sizeof(char))
- (CPUFREQ_NAME_LEN + 2)))
goto out;
- i += scnprintf(&buf[i], CPUFREQ_NAME_LEN, "%s ", t->name);
+ i += scnprintf(&buf[i], CPUFREQ_NAME_PLEN, "%s ", t->name);
}
out:
i += sprintf(&buf[i], "\n");
@@ -581,7 +583,7 @@ static ssize_t show_scaling_setspeed(struct cpufreq_policy *policy, char *buf)
}
/**
- * show_scaling_driver - show the current cpufreq HW/BIOS limitation
+ * show_bios_limit - show the current cpufreq HW/BIOS limitation
*/
static ssize_t show_bios_limit(struct cpufreq_policy *policy, char *buf)
{
@@ -1468,12 +1470,23 @@ int __cpufreq_driver_target(struct cpufreq_policy *policy,
unsigned int relation)
{
int retval = -EINVAL;
+ unsigned int old_target_freq = target_freq;
if (cpufreq_disabled())
return -ENODEV;
- pr_debug("target for CPU %u: %u kHz, relation %u\n", policy->cpu,
- target_freq, relation);
+ /* Make sure that target_freq is within supported range */
+ if (target_freq > policy->max)
+ target_freq = policy->max;
+ if (target_freq < policy->min)
+ target_freq = policy->min;
+
+ pr_debug("target for CPU %u: %u kHz, relation %u, requested %u kHz\n",
+ policy->cpu, target_freq, relation, old_target_freq);
+
+ if (target_freq == policy->cur)
+ return 0;
+
if (cpu_online(policy->cpu) && cpufreq_driver->target)
retval = cpufreq_driver->target(policy, target_freq, relation);
@@ -1509,12 +1522,14 @@ int __cpufreq_driver_getavg(struct cpufreq_policy *policy, unsigned int cpu)
{
int ret = 0;
+ if (!(cpu_online(cpu) && cpufreq_driver->getavg))
+ return 0;
+
policy = cpufreq_cpu_get(policy->cpu);
if (!policy)
return -EINVAL;
- if (cpu_online(cpu) && cpufreq_driver->getavg)
- ret = cpufreq_driver->getavg(policy, cpu);
+ ret = cpufreq_driver->getavg(policy, cpu);
cpufreq_cpu_put(policy);
return ret;
diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c
index a152af7e199..64ef737e7e7 100644
--- a/drivers/cpufreq/cpufreq_conservative.c
+++ b/drivers/cpufreq/cpufreq_conservative.c
@@ -11,83 +11,30 @@
* published by the Free Software Foundation.
*/
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
#include <linux/cpufreq.h>
-#include <linux/cpu.h>
-#include <linux/jiffies.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
#include <linux/kernel_stat.h>
+#include <linux/kobject.h>
+#include <linux/module.h>
#include <linux/mutex.h>
-#include <linux/hrtimer.h>
-#include <linux/tick.h>
-#include <linux/ktime.h>
-#include <linux/sched.h>
+#include <linux/notifier.h>
+#include <linux/percpu-defs.h>
+#include <linux/sysfs.h>
+#include <linux/types.h>
-/*
- * dbs is used in this file as a shortform for demandbased switching
- * It helps to keep variable names smaller, simpler
- */
+#include "cpufreq_governor.h"
+/* Conservative governor macors */
#define DEF_FREQUENCY_UP_THRESHOLD (80)
#define DEF_FREQUENCY_DOWN_THRESHOLD (20)
-
-/*
- * The polling frequency of this governor depends on the capability of
- * the processor. Default polling frequency is 1000 times the transition
- * latency of the processor. The governor will work on any processor with
- * transition latency <= 10mS, using appropriate sampling
- * rate.
- * For CPUs with transition latency > 10mS (mostly drivers with CPUFREQ_ETERNAL)
- * this governor will not work.
- * All times here are in uS.
- */
-#define MIN_SAMPLING_RATE_RATIO (2)
-
-static unsigned int min_sampling_rate;
-
-#define LATENCY_MULTIPLIER (1000)
-#define MIN_LATENCY_MULTIPLIER (100)
#define DEF_SAMPLING_DOWN_FACTOR (1)
#define MAX_SAMPLING_DOWN_FACTOR (10)
-#define TRANSITION_LATENCY_LIMIT (10 * 1000 * 1000)
-
-static void do_dbs_timer(struct work_struct *work);
-
-struct cpu_dbs_info_s {
- cputime64_t prev_cpu_idle;
- cputime64_t prev_cpu_wall;
- cputime64_t prev_cpu_nice;
- struct cpufreq_policy *cur_policy;
- struct delayed_work work;
- unsigned int down_skip;
- unsigned int requested_freq;
- int cpu;
- unsigned int enable:1;
- /*
- * percpu mutex that serializes governor limit change with
- * do_dbs_timer invocation. We do not want do_dbs_timer to run
- * when user is changing the governor or limits.
- */
- struct mutex timer_mutex;
-};
-static DEFINE_PER_CPU(struct cpu_dbs_info_s, cs_cpu_dbs_info);
-static unsigned int dbs_enable; /* number of CPUs using this policy */
+static struct dbs_data cs_dbs_data;
+static DEFINE_PER_CPU(struct cs_cpu_dbs_info_s, cs_cpu_dbs_info);
-/*
- * dbs_mutex protects dbs_enable in governor start/stop.
- */
-static DEFINE_MUTEX(dbs_mutex);
-
-static struct dbs_tuners {
- unsigned int sampling_rate;
- unsigned int sampling_down_factor;
- unsigned int up_threshold;
- unsigned int down_threshold;
- unsigned int ignore_nice;
- unsigned int freq_step;
-} dbs_tuners_ins = {
+static struct cs_dbs_tuners cs_tuners = {
.up_threshold = DEF_FREQUENCY_UP_THRESHOLD,
.down_threshold = DEF_FREQUENCY_DOWN_THRESHOLD,
.sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR,
@@ -95,95 +42,121 @@ static struct dbs_tuners {
.freq_step = 5,
};
-static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall)
+/*
+ * Every sampling_rate, we check, if current idle time is less than 20%
+ * (default), then we try to increase frequency Every sampling_rate *
+ * sampling_down_factor, we check, if current idle time is more than 80%, then
+ * we try to decrease frequency
+ *
+ * Any frequency increase takes it to the maximum frequency. Frequency reduction
+ * happens at minimum steps of 5% (default) of maximum frequency
+ */
+static void cs_check_cpu(int cpu, unsigned int load)
{
- u64 idle_time;
- u64 cur_wall_time;
- u64 busy_time;
+ struct cs_cpu_dbs_info_s *dbs_info = &per_cpu(cs_cpu_dbs_info, cpu);
+ struct cpufreq_policy *policy = dbs_info->cdbs.cur_policy;
+ unsigned int freq_target;
+
+ /*
+ * break out if we 'cannot' reduce the speed as the user might
+ * want freq_step to be zero
+ */
+ if (cs_tuners.freq_step == 0)
+ return;
- cur_wall_time = jiffies64_to_cputime64(get_jiffies_64());
+ /* Check for frequency increase */
+ if (load > cs_tuners.up_threshold) {
+ dbs_info->down_skip = 0;
- busy_time = kcpustat_cpu(cpu).cpustat[CPUTIME_USER];
- busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SYSTEM];
- busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_IRQ];
- busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SOFTIRQ];
- busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_STEAL];
- busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE];
+ /* if we are already at full speed then break out early */
+ if (dbs_info->requested_freq == policy->max)
+ return;
- idle_time = cur_wall_time - busy_time;
- if (wall)
- *wall = jiffies_to_usecs(cur_wall_time);
+ freq_target = (cs_tuners.freq_step * policy->max) / 100;
- return jiffies_to_usecs(idle_time);
+ /* max freq cannot be less than 100. But who knows.... */
+ if (unlikely(freq_target == 0))
+ freq_target = 5;
+
+ dbs_info->requested_freq += freq_target;
+ if (dbs_info->requested_freq > policy->max)
+ dbs_info->requested_freq = policy->max;
+
+ __cpufreq_driver_target(policy, dbs_info->requested_freq,
+ CPUFREQ_RELATION_H);
+ return;
+ }
+
+ /*
+ * The optimal frequency is the frequency that is the lowest that can
+ * support the current CPU usage without triggering the up policy. To be
+ * safe, we focus 10 points under the threshold.
+ */
+ if (load < (cs_tuners.down_threshold - 10)) {
+ freq_target = (cs_tuners.freq_step * policy->max) / 100;
+
+ dbs_info->requested_freq -= freq_target;
+ if (dbs_info->requested_freq < policy->min)
+ dbs_info->requested_freq = policy->min;
+
+ /*
+ * if we cannot reduce the frequency anymore, break out early
+ */
+ if (policy->cur == policy->min)
+ return;
+
+ __cpufreq_driver_target(policy, dbs_info->requested_freq,
+ CPUFREQ_RELATION_H);
+ return;
+ }
}
-static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall)
+static void cs_dbs_timer(struct work_struct *work)
{
- u64 idle_time = get_cpu_idle_time_us(cpu, NULL);
+ struct cs_cpu_dbs_info_s *dbs_info = container_of(work,
+ struct cs_cpu_dbs_info_s, cdbs.work.work);
+ unsigned int cpu = dbs_info->cdbs.cpu;
+ int delay = delay_for_sampling_rate(cs_tuners.sampling_rate);
- if (idle_time == -1ULL)
- return get_cpu_idle_time_jiffy(cpu, wall);
- else
- idle_time += get_cpu_iowait_time_us(cpu, wall);
+ mutex_lock(&dbs_info->cdbs.timer_mutex);
- return idle_time;
+ dbs_check_cpu(&cs_dbs_data, cpu);
+
+ schedule_delayed_work_on(cpu, &dbs_info->cdbs.work, delay);
+ mutex_unlock(&dbs_info->cdbs.timer_mutex);
}
-/* keep track of frequency transitions */
-static int
-dbs_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
- void *data)
+static int dbs_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
+ void *data)
{
struct cpufreq_freqs *freq = data;
- struct cpu_dbs_info_s *this_dbs_info = &per_cpu(cs_cpu_dbs_info,
- freq->cpu);
-
+ struct cs_cpu_dbs_info_s *dbs_info =
+ &per_cpu(cs_cpu_dbs_info, freq->cpu);
struct cpufreq_policy *policy;
- if (!this_dbs_info->enable)
+ if (!dbs_info->enable)
return 0;
- policy = this_dbs_info->cur_policy;
+ policy = dbs_info->cdbs.cur_policy;
/*
- * we only care if our internally tracked freq moves outside
- * the 'valid' ranges of freqency available to us otherwise
- * we do not change it
+ * we only care if our internally tracked freq moves outside the 'valid'
+ * ranges of freqency available to us otherwise we do not change it
*/
- if (this_dbs_info->requested_freq > policy->max
- || this_dbs_info->requested_freq < policy->min)
- this_dbs_info->requested_freq = freq->new;
+ if (dbs_info->requested_freq > policy->max
+ || dbs_info->requested_freq < policy->min)
+ dbs_info->requested_freq = freq->new;
return 0;
}
-static struct notifier_block dbs_cpufreq_notifier_block = {
- .notifier_call = dbs_cpufreq_notifier
-};
-
/************************** sysfs interface ************************/
static ssize_t show_sampling_rate_min(struct kobject *kobj,
struct attribute *attr, char *buf)
{
- return sprintf(buf, "%u\n", min_sampling_rate);
+ return sprintf(buf, "%u\n", cs_dbs_data.min_sampling_rate);
}
-define_one_global_ro(sampling_rate_min);
-
-/* cpufreq_conservative Governor Tunables */
-#define show_one(file_name, object) \
-static ssize_t show_##file_name \
-(struct kobject *kobj, struct attribute *attr, char *buf) \
-{ \
- return sprintf(buf, "%u\n", dbs_tuners_ins.object); \
-}
-show_one(sampling_rate, sampling_rate);
-show_one(sampling_down_factor, sampling_down_factor);
-show_one(up_threshold, up_threshold);
-show_one(down_threshold, down_threshold);
-show_one(ignore_nice_load, ignore_nice);
-show_one(freq_step, freq_step);
-
static ssize_t store_sampling_down_factor(struct kobject *a,
struct attribute *b,
const char *buf, size_t count)
@@ -195,7 +168,7 @@ static ssize_t store_sampling_down_factor(struct kobject *a,
if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1)
return -EINVAL;
- dbs_tuners_ins.sampling_down_factor = input;
+ cs_tuners.sampling_down_factor = input;
return count;
}
@@ -209,7 +182,7 @@ static ssize_t store_sampling_rate(struct kobject *a, struct attribute *b,
if (ret != 1)
return -EINVAL;
- dbs_tuners_ins.sampling_rate = max(input, min_sampling_rate);
+ cs_tuners.sampling_rate = max(input, cs_dbs_data.min_sampling_rate);
return count;
}
@@ -220,11 +193,10 @@ static ssize_t store_up_threshold(struct kobject *a, struct attribute *b,
int ret;
ret = sscanf(buf, "%u", &input);
- if (ret != 1 || input > 100 ||
- input <= dbs_tuners_ins.down_threshold)
+ if (ret != 1 || input > 100 || input <= cs_tuners.down_threshold)
return -EINVAL;
- dbs_tuners_ins.up_threshold = input;
+ cs_tuners.up_threshold = input;
return count;
}
@@ -237,21 +209,19 @@ static ssize_t store_down_threshold(struct kobject *a, struct attribute *b,
/* cannot be lower than 11 otherwise freq will not fall */
if (ret != 1 || input < 11 || input > 100 ||
- input >= dbs_tuners_ins.up_threshold)
+ input >= cs_tuners.up_threshold)
return -EINVAL;
- dbs_tuners_ins.down_threshold = input;
+ cs_tuners.down_threshold = input;
return count;
}
static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b,
const char *buf, size_t count)
{
- unsigned int input;
+ unsigned int input, j;
int ret;
- unsigned int j;
-
ret = sscanf(buf, "%u", &input);
if (ret != 1)
return -EINVAL;
@@ -259,19 +229,20 @@ static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b,
if (input > 1)
input = 1;
- if (input == dbs_tuners_ins.ignore_nice) /* nothing to do */
+ if (input == cs_tuners.ignore_nice) /* nothing to do */
return count;
- dbs_tuners_ins.ignore_nice = input;
+ cs_tuners.ignore_nice = input;
/* we need to re-evaluate prev_cpu_idle */
for_each_online_cpu(j) {
- struct cpu_dbs_info_s *dbs_info;
+ struct cs_cpu_dbs_info_s *dbs_info;
dbs_info = &per_cpu(cs_cpu_dbs_info, j);
- dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
- &dbs_info->prev_cpu_wall);
- if (dbs_tuners_ins.ignore_nice)
- dbs_info->prev_cpu_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE];
+ dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j,
+ &dbs_info->cdbs.prev_cpu_wall);
+ if (cs_tuners.ignore_nice)
+ dbs_info->cdbs.prev_cpu_nice =
+ kcpustat_cpu(j).cpustat[CPUTIME_NICE];
}
return count;
}
@@ -289,18 +260,28 @@ static ssize_t store_freq_step(struct kobject *a, struct attribute *b,
if (input > 100)
input = 100;
- /* no need to test here if freq_step is zero as the user might actually
- * want this, they would be crazy though :) */
- dbs_tuners_ins.freq_step = input;
+ /*
+ * no need to test here if freq_step is zero as the user might actually
+ * want this, they would be crazy though :)
+ */
+ cs_tuners.freq_step = input;
return count;
}
+show_one(cs, sampling_rate, sampling_rate);
+show_one(cs, sampling_down_factor, sampling_down_factor);
+show_one(cs, up_threshold, up_threshold);
+show_one(cs, down_threshold, down_threshold);
+show_one(cs, ignore_nice_load, ignore_nice);
+show_one(cs, freq_step, freq_step);
+
define_one_global_rw(sampling_rate);
define_one_global_rw(sampling_down_factor);
define_one_global_rw(up_threshold);
define_one_global_rw(down_threshold);
define_one_global_rw(ignore_nice_load);
define_one_global_rw(freq_step);
+define_one_global_ro(sampling_rate_min);
static struct attribute *dbs_attributes[] = {
&sampling_rate_min.attr,
@@ -313,283 +294,38 @@ static struct attribute *dbs_attributes[] = {
NULL
};
-static struct attribute_group dbs_attr_group = {
+static struct attribute_group cs_attr_group = {
.attrs = dbs_attributes,
.name = "conservative",
};
/************************** sysfs end ************************/
-static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
-{
- unsigned int load = 0;
- unsigned int max_load = 0;
- unsigned int freq_target;
-
- struct cpufreq_policy *policy;
- unsigned int j;
-
- policy = this_dbs_info->cur_policy;
-
- /*
- * Every sampling_rate, we check, if current idle time is less
- * than 20% (default), then we try to increase frequency
- * Every sampling_rate*sampling_down_factor, we check, if current
- * idle time is more than 80%, then we try to decrease frequency
- *
- * Any frequency increase takes it to the maximum frequency.
- * Frequency reduction happens at minimum steps of
- * 5% (default) of maximum frequency
- */
-
- /* Get Absolute Load */
- for_each_cpu(j, policy->cpus) {
- struct cpu_dbs_info_s *j_dbs_info;
- cputime64_t cur_wall_time, cur_idle_time;
- unsigned int idle_time, wall_time;
-
- j_dbs_info = &per_cpu(cs_cpu_dbs_info, j);
-
- cur_idle_time = get_cpu_idle_time(j, &cur_wall_time);
-
- wall_time = (unsigned int)
- (cur_wall_time - j_dbs_info->prev_cpu_wall);
- j_dbs_info->prev_cpu_wall = cur_wall_time;
-
- idle_time = (unsigned int)
- (cur_idle_time - j_dbs_info->prev_cpu_idle);
- j_dbs_info->prev_cpu_idle = cur_idle_time;
-
- if (dbs_tuners_ins.ignore_nice) {
- u64 cur_nice;
- unsigned long cur_nice_jiffies;
-
- cur_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE] -
- j_dbs_info->prev_cpu_nice;
- /*
- * Assumption: nice time between sampling periods will
- * be less than 2^32 jiffies for 32 bit sys
- */
- cur_nice_jiffies = (unsigned long)
- cputime64_to_jiffies64(cur_nice);
-
- j_dbs_info->prev_cpu_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE];
- idle_time += jiffies_to_usecs(cur_nice_jiffies);
- }
+define_get_cpu_dbs_routines(cs_cpu_dbs_info);
- if (unlikely(!wall_time || wall_time < idle_time))
- continue;
-
- load = 100 * (wall_time - idle_time) / wall_time;
-
- if (load > max_load)
- max_load = load;
- }
-
- /*
- * break out if we 'cannot' reduce the speed as the user might
- * want freq_step to be zero
- */
- if (dbs_tuners_ins.freq_step == 0)
- return;
-
- /* Check for frequency increase */
- if (max_load > dbs_tuners_ins.up_threshold) {
- this_dbs_info->down_skip = 0;
-
- /* if we are already at full speed then break out early */
- if (this_dbs_info->requested_freq == policy->max)
- return;
-
- freq_target = (dbs_tuners_ins.freq_step * policy->max) / 100;
-
- /* max freq cannot be less than 100. But who knows.... */
- if (unlikely(freq_target == 0))
- freq_target = 5;
-
- this_dbs_info->requested_freq += freq_target;
- if (this_dbs_info->requested_freq > policy->max)
- this_dbs_info->requested_freq = policy->max;
-
- __cpufreq_driver_target(policy, this_dbs_info->requested_freq,
- CPUFREQ_RELATION_H);
- return;
- }
-
- /*
- * The optimal frequency is the frequency that is the lowest that
- * can support the current CPU usage without triggering the up
- * policy. To be safe, we focus 10 points under the threshold.
- */
- if (max_load < (dbs_tuners_ins.down_threshold - 10)) {
- freq_target = (dbs_tuners_ins.freq_step * policy->max) / 100;
-
- this_dbs_info->requested_freq -= freq_target;
- if (this_dbs_info->requested_freq < policy->min)
- this_dbs_info->requested_freq = policy->min;
-
- /*
- * if we cannot reduce the frequency anymore, break out early
- */
- if (policy->cur == policy->min)
- return;
-
- __cpufreq_driver_target(policy, this_dbs_info->requested_freq,
- CPUFREQ_RELATION_H);
- return;
- }
-}
-
-static void do_dbs_timer(struct work_struct *work)
-{
- struct cpu_dbs_info_s *dbs_info =
- container_of(work, struct cpu_dbs_info_s, work.work);
- unsigned int cpu = dbs_info->cpu;
-
- /* We want all CPUs to do sampling nearly on same jiffy */
- int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate);
-
- delay -= jiffies % delay;
-
- mutex_lock(&dbs_info->timer_mutex);
-
- dbs_check_cpu(dbs_info);
-
- schedule_delayed_work_on(cpu, &dbs_info->work, delay);
- mutex_unlock(&dbs_info->timer_mutex);
-}
-
-static inline void dbs_timer_init(struct cpu_dbs_info_s *dbs_info)
-{
- /* We want all CPUs to do sampling nearly on same jiffy */
- int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate);
- delay -= jiffies % delay;
+static struct notifier_block cs_cpufreq_notifier_block = {
+ .notifier_call = dbs_cpufreq_notifier,
+};
- dbs_info->enable = 1;
- INIT_DEFERRABLE_WORK(&dbs_info->work, do_dbs_timer);
- schedule_delayed_work_on(dbs_info->cpu, &dbs_info->work, delay);
-}
+static struct cs_ops cs_ops = {
+ .notifier_block = &cs_cpufreq_notifier_block,
+};
-static inline void dbs_timer_exit(struct cpu_dbs_info_s *dbs_info)
-{
- dbs_info->enable = 0;
- cancel_delayed_work_sync(&dbs_info->work);
-}
+static struct dbs_data cs_dbs_data = {
+ .governor = GOV_CONSERVATIVE,
+ .attr_group = &cs_attr_group,
+ .tuners = &cs_tuners,
+ .get_cpu_cdbs = get_cpu_cdbs,
+ .get_cpu_dbs_info_s = get_cpu_dbs_info_s,
+ .gov_dbs_timer = cs_dbs_timer,
+ .gov_check_cpu = cs_check_cpu,
+ .gov_ops = &cs_ops,
+};
-static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
+static int cs_cpufreq_governor_dbs(struct cpufreq_policy *policy,
unsigned int event)
{
- unsigned int cpu = policy->cpu;
- struct cpu_dbs_info_s *this_dbs_info;
- unsigned int j;
- int rc;
-
- this_dbs_info = &per_cpu(cs_cpu_dbs_info, cpu);
-
- switch (event) {
- case CPUFREQ_GOV_START:
- if ((!cpu_online(cpu)) || (!policy->cur))
- return -EINVAL;
-
- mutex_lock(&dbs_mutex);
-
- for_each_cpu(j, policy->cpus) {
- struct cpu_dbs_info_s *j_dbs_info;
- j_dbs_info = &per_cpu(cs_cpu_dbs_info, j);
- j_dbs_info->cur_policy = policy;
-
- j_dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
- &j_dbs_info->prev_cpu_wall);
- if (dbs_tuners_ins.ignore_nice)
- j_dbs_info->prev_cpu_nice =
- kcpustat_cpu(j).cpustat[CPUTIME_NICE];
- }
- this_dbs_info->cpu = cpu;
- this_dbs_info->down_skip = 0;
- this_dbs_info->requested_freq = policy->cur;
-
- mutex_init(&this_dbs_info->timer_mutex);
- dbs_enable++;
- /*
- * Start the timerschedule work, when this governor
- * is used for first time
- */
- if (dbs_enable == 1) {
- unsigned int latency;
- /* policy latency is in nS. Convert it to uS first */
- latency = policy->cpuinfo.transition_latency / 1000;
- if (latency == 0)
- latency = 1;
-
- rc = sysfs_create_group(cpufreq_global_kobject,
- &dbs_attr_group);
- if (rc) {
- mutex_unlock(&dbs_mutex);
- return rc;
- }
-
- /*
- * conservative does not implement micro like ondemand
- * governor, thus we are bound to jiffes/HZ
- */
- min_sampling_rate =
- MIN_SAMPLING_RATE_RATIO * jiffies_to_usecs(10);
- /* Bring kernel and HW constraints together */
- min_sampling_rate = max(min_sampling_rate,
- MIN_LATENCY_MULTIPLIER * latency);
- dbs_tuners_ins.sampling_rate =
- max(min_sampling_rate,
- latency * LATENCY_MULTIPLIER);
-
- cpufreq_register_notifier(
- &dbs_cpufreq_notifier_block,
- CPUFREQ_TRANSITION_NOTIFIER);
- }
- mutex_unlock(&dbs_mutex);
-
- dbs_timer_init(this_dbs_info);
-
- break;
-
- case CPUFREQ_GOV_STOP:
- dbs_timer_exit(this_dbs_info);
-
- mutex_lock(&dbs_mutex);
- dbs_enable--;
- mutex_destroy(&this_dbs_info->timer_mutex);
-
- /*
- * Stop the timerschedule work, when this governor
- * is used for first time
- */
- if (dbs_enable == 0)
- cpufreq_unregister_notifier(
- &dbs_cpufreq_notifier_block,
- CPUFREQ_TRANSITION_NOTIFIER);
-
- mutex_unlock(&dbs_mutex);
- if (!dbs_enable)
- sysfs_remove_group(cpufreq_global_kobject,
- &dbs_attr_group);
-
- break;
-
- case CPUFREQ_GOV_LIMITS:
- mutex_lock(&this_dbs_info->timer_mutex);
- if (policy->max < this_dbs_info->cur_policy->cur)
- __cpufreq_driver_target(
- this_dbs_info->cur_policy,
- policy->max, CPUFREQ_RELATION_H);
- else if (policy->min > this_dbs_info->cur_policy->cur)
- __cpufreq_driver_target(
- this_dbs_info->cur_policy,
- policy->min, CPUFREQ_RELATION_L);
- dbs_check_cpu(this_dbs_info);
- mutex_unlock(&this_dbs_info->timer_mutex);
-
- break;
- }
- return 0;
+ return cpufreq_governor_dbs(&cs_dbs_data, policy, event);
}
#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
@@ -597,13 +333,14 @@ static
#endif
struct cpufreq_governor cpufreq_gov_conservative = {
.name = "conservative",
- .governor = cpufreq_governor_dbs,
+ .governor = cs_cpufreq_governor_dbs,
.max_transition_latency = TRANSITION_LATENCY_LIMIT,
.owner = THIS_MODULE,
};
static int __init cpufreq_gov_dbs_init(void)
{
+ mutex_init(&cs_dbs_data.mutex);
return cpufreq_register_governor(&cpufreq_gov_conservative);
}
@@ -612,7 +349,6 @@ static void __exit cpufreq_gov_dbs_exit(void)
cpufreq_unregister_governor(&cpufreq_gov_conservative);
}
-
MODULE_AUTHOR("Alexander Clouter <alex@digriz.org.uk>");
MODULE_DESCRIPTION("'cpufreq_conservative' - A dynamic cpufreq governor for "
"Low Latency Frequency Transition capable processors "
diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c
new file mode 100644
index 00000000000..6c5f1d383cd
--- /dev/null
+++ b/drivers/cpufreq/cpufreq_governor.c
@@ -0,0 +1,318 @@
+/*
+ * drivers/cpufreq/cpufreq_governor.c
+ *
+ * CPUFREQ governors common code
+ *
+ * Copyright (C) 2001 Russell King
+ * (C) 2003 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>.
+ * (C) 2003 Jun Nakajima <jun.nakajima@intel.com>
+ * (C) 2009 Alexander Clouter <alex@digriz.org.uk>
+ * (c) 2012 Viresh Kumar <viresh.kumar@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <asm/cputime.h>
+#include <linux/cpufreq.h>
+#include <linux/cpumask.h>
+#include <linux/export.h>
+#include <linux/kernel_stat.h>
+#include <linux/mutex.h>
+#include <linux/tick.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+
+#include "cpufreq_governor.h"
+
+static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall)
+{
+ u64 idle_time;
+ u64 cur_wall_time;
+ u64 busy_time;
+
+ cur_wall_time = jiffies64_to_cputime64(get_jiffies_64());
+
+ busy_time = kcpustat_cpu(cpu).cpustat[CPUTIME_USER];
+ busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SYSTEM];
+ busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_IRQ];
+ busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SOFTIRQ];
+ busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_STEAL];
+ busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE];
+
+ idle_time = cur_wall_time - busy_time;
+ if (wall)
+ *wall = cputime_to_usecs(cur_wall_time);
+
+ return cputime_to_usecs(idle_time);
+}
+
+u64 get_cpu_idle_time(unsigned int cpu, u64 *wall)
+{
+ u64 idle_time = get_cpu_idle_time_us(cpu, NULL);
+
+ if (idle_time == -1ULL)
+ return get_cpu_idle_time_jiffy(cpu, wall);
+ else
+ idle_time += get_cpu_iowait_time_us(cpu, wall);
+
+ return idle_time;
+}
+EXPORT_SYMBOL_GPL(get_cpu_idle_time);
+
+void dbs_check_cpu(struct dbs_data *dbs_data, int cpu)
+{
+ struct cpu_dbs_common_info *cdbs = dbs_data->get_cpu_cdbs(cpu);
+ struct od_dbs_tuners *od_tuners = dbs_data->tuners;
+ struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
+ struct cpufreq_policy *policy;
+ unsigned int max_load = 0;
+ unsigned int ignore_nice;
+ unsigned int j;
+
+ if (dbs_data->governor == GOV_ONDEMAND)
+ ignore_nice = od_tuners->ignore_nice;
+ else
+ ignore_nice = cs_tuners->ignore_nice;
+
+ policy = cdbs->cur_policy;
+
+ /* Get Absolute Load (in terms of freq for ondemand gov) */
+ for_each_cpu(j, policy->cpus) {
+ struct cpu_dbs_common_info *j_cdbs;
+ u64 cur_wall_time, cur_idle_time, cur_iowait_time;
+ unsigned int idle_time, wall_time, iowait_time;
+ unsigned int load;
+
+ j_cdbs = dbs_data->get_cpu_cdbs(j);
+
+ cur_idle_time = get_cpu_idle_time(j, &cur_wall_time);
+
+ wall_time = (unsigned int)
+ (cur_wall_time - j_cdbs->prev_cpu_wall);
+ j_cdbs->prev_cpu_wall = cur_wall_time;
+
+ idle_time = (unsigned int)
+ (cur_idle_time - j_cdbs->prev_cpu_idle);
+ j_cdbs->prev_cpu_idle = cur_idle_time;
+
+ if (ignore_nice) {
+ u64 cur_nice;
+ unsigned long cur_nice_jiffies;
+
+ cur_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE] -
+ cdbs->prev_cpu_nice;
+ /*
+ * Assumption: nice time between sampling periods will
+ * be less than 2^32 jiffies for 32 bit sys
+ */
+ cur_nice_jiffies = (unsigned long)
+ cputime64_to_jiffies64(cur_nice);
+
+ cdbs->prev_cpu_nice =
+ kcpustat_cpu(j).cpustat[CPUTIME_NICE];
+ idle_time += jiffies_to_usecs(cur_nice_jiffies);
+ }
+
+ if (dbs_data->governor == GOV_ONDEMAND) {
+ struct od_cpu_dbs_info_s *od_j_dbs_info =
+ dbs_data->get_cpu_dbs_info_s(cpu);
+
+ cur_iowait_time = get_cpu_iowait_time_us(j,
+ &cur_wall_time);
+ if (cur_iowait_time == -1ULL)
+ cur_iowait_time = 0;
+
+ iowait_time = (unsigned int) (cur_iowait_time -
+ od_j_dbs_info->prev_cpu_iowait);
+ od_j_dbs_info->prev_cpu_iowait = cur_iowait_time;
+
+ /*
+ * For the purpose of ondemand, waiting for disk IO is
+ * an indication that you're performance critical, and
+ * not that the system is actually idle. So subtract the
+ * iowait time from the cpu idle time.
+ */
+ if (od_tuners->io_is_busy && idle_time >= iowait_time)
+ idle_time -= iowait_time;
+ }
+
+ if (unlikely(!wall_time || wall_time < idle_time))
+ continue;
+
+ load = 100 * (wall_time - idle_time) / wall_time;
+
+ if (dbs_data->governor == GOV_ONDEMAND) {
+ int freq_avg = __cpufreq_driver_getavg(policy, j);
+ if (freq_avg <= 0)
+ freq_avg = policy->cur;
+
+ load *= freq_avg;
+ }
+
+ if (load > max_load)
+ max_load = load;
+ }
+
+ dbs_data->gov_check_cpu(cpu, max_load);
+}
+EXPORT_SYMBOL_GPL(dbs_check_cpu);
+
+static inline void dbs_timer_init(struct dbs_data *dbs_data,
+ struct cpu_dbs_common_info *cdbs, unsigned int sampling_rate)
+{
+ int delay = delay_for_sampling_rate(sampling_rate);
+
+ INIT_DEFERRABLE_WORK(&cdbs->work, dbs_data->gov_dbs_timer);
+ schedule_delayed_work_on(cdbs->cpu, &cdbs->work, delay);
+}
+
+static inline void dbs_timer_exit(struct cpu_dbs_common_info *cdbs)
+{
+ cancel_delayed_work_sync(&cdbs->work);
+}
+
+int cpufreq_governor_dbs(struct dbs_data *dbs_data,
+ struct cpufreq_policy *policy, unsigned int event)
+{
+ struct od_cpu_dbs_info_s *od_dbs_info = NULL;
+ struct cs_cpu_dbs_info_s *cs_dbs_info = NULL;
+ struct od_dbs_tuners *od_tuners = dbs_data->tuners;
+ struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
+ struct cpu_dbs_common_info *cpu_cdbs;
+ unsigned int *sampling_rate, latency, ignore_nice, j, cpu = policy->cpu;
+ int rc;
+
+ cpu_cdbs = dbs_data->get_cpu_cdbs(cpu);
+
+ if (dbs_data->governor == GOV_CONSERVATIVE) {
+ cs_dbs_info = dbs_data->get_cpu_dbs_info_s(cpu);
+ sampling_rate = &cs_tuners->sampling_rate;
+ ignore_nice = cs_tuners->ignore_nice;
+ } else {
+ od_dbs_info = dbs_data->get_cpu_dbs_info_s(cpu);
+ sampling_rate = &od_tuners->sampling_rate;
+ ignore_nice = od_tuners->ignore_nice;
+ }
+
+ switch (event) {
+ case CPUFREQ_GOV_START:
+ if ((!cpu_online(cpu)) || (!policy->cur))
+ return -EINVAL;
+
+ mutex_lock(&dbs_data->mutex);
+
+ dbs_data->enable++;
+ cpu_cdbs->cpu = cpu;
+ for_each_cpu(j, policy->cpus) {
+ struct cpu_dbs_common_info *j_cdbs;
+ j_cdbs = dbs_data->get_cpu_cdbs(j);
+
+ j_cdbs->cur_policy = policy;
+ j_cdbs->prev_cpu_idle = get_cpu_idle_time(j,
+ &j_cdbs->prev_cpu_wall);
+ if (ignore_nice)
+ j_cdbs->prev_cpu_nice =
+ kcpustat_cpu(j).cpustat[CPUTIME_NICE];
+ }
+
+ /*
+ * Start the timerschedule work, when this governor is used for
+ * first time
+ */
+ if (dbs_data->enable != 1)
+ goto second_time;
+
+ rc = sysfs_create_group(cpufreq_global_kobject,
+ dbs_data->attr_group);
+ if (rc) {
+ mutex_unlock(&dbs_data->mutex);
+ return rc;
+ }
+
+ /* policy latency is in nS. Convert it to uS first */
+ latency = policy->cpuinfo.transition_latency / 1000;
+ if (latency == 0)
+ latency = 1;
+
+ /*
+ * conservative does not implement micro like ondemand
+ * governor, thus we are bound to jiffes/HZ
+ */
+ if (dbs_data->governor == GOV_CONSERVATIVE) {
+ struct cs_ops *ops = dbs_data->gov_ops;
+
+ cpufreq_register_notifier(ops->notifier_block,
+ CPUFREQ_TRANSITION_NOTIFIER);
+
+ dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO *
+ jiffies_to_usecs(10);
+ } else {
+ struct od_ops *ops = dbs_data->gov_ops;
+
+ od_tuners->io_is_busy = ops->io_busy();
+ }
+
+ /* Bring kernel and HW constraints together */
+ dbs_data->min_sampling_rate = max(dbs_data->min_sampling_rate,
+ MIN_LATENCY_MULTIPLIER * latency);
+ *sampling_rate = max(dbs_data->min_sampling_rate, latency *
+ LATENCY_MULTIPLIER);
+
+second_time:
+ if (dbs_data->governor == GOV_CONSERVATIVE) {
+ cs_dbs_info->down_skip = 0;
+ cs_dbs_info->enable = 1;
+ cs_dbs_info->requested_freq = policy->cur;
+ } else {
+ struct od_ops *ops = dbs_data->gov_ops;
+ od_dbs_info->rate_mult = 1;
+ od_dbs_info->sample_type = OD_NORMAL_SAMPLE;
+ ops->powersave_bias_init_cpu(cpu);
+ }
+ mutex_unlock(&dbs_data->mutex);
+
+ mutex_init(&cpu_cdbs->timer_mutex);
+ dbs_timer_init(dbs_data, cpu_cdbs, *sampling_rate);
+ break;
+
+ case CPUFREQ_GOV_STOP:
+ if (dbs_data->governor == GOV_CONSERVATIVE)
+ cs_dbs_info->enable = 0;
+
+ dbs_timer_exit(cpu_cdbs);
+
+ mutex_lock(&dbs_data->mutex);
+ mutex_destroy(&cpu_cdbs->timer_mutex);
+ dbs_data->enable--;
+ if (!dbs_data->enable) {
+ struct cs_ops *ops = dbs_data->gov_ops;
+
+ sysfs_remove_group(cpufreq_global_kobject,
+ dbs_data->attr_group);
+ if (dbs_data->governor == GOV_CONSERVATIVE)
+ cpufreq_unregister_notifier(ops->notifier_block,
+ CPUFREQ_TRANSITION_NOTIFIER);
+ }
+ mutex_unlock(&dbs_data->mutex);
+
+ break;
+
+ case CPUFREQ_GOV_LIMITS:
+ mutex_lock(&cpu_cdbs->timer_mutex);
+ if (policy->max < cpu_cdbs->cur_policy->cur)
+ __cpufreq_driver_target(cpu_cdbs->cur_policy,
+ policy->max, CPUFREQ_RELATION_H);
+ else if (policy->min > cpu_cdbs->cur_policy->cur)
+ __cpufreq_driver_target(cpu_cdbs->cur_policy,
+ policy->min, CPUFREQ_RELATION_L);
+ dbs_check_cpu(dbs_data, cpu);
+ mutex_unlock(&cpu_cdbs->timer_mutex);
+ break;
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cpufreq_governor_dbs);
diff --git a/drivers/cpufreq/cpufreq_governor.h b/drivers/cpufreq/cpufreq_governor.h
new file mode 100644
index 00000000000..f6616540c53
--- /dev/null
+++ b/drivers/cpufreq/cpufreq_governor.h
@@ -0,0 +1,176 @@
+/*
+ * drivers/cpufreq/cpufreq_governor.h
+ *
+ * Header file for CPUFreq governors common code
+ *
+ * Copyright (C) 2001 Russell King
+ * (C) 2003 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>.
+ * (C) 2003 Jun Nakajima <jun.nakajima@intel.com>
+ * (C) 2009 Alexander Clouter <alex@digriz.org.uk>
+ * (c) 2012 Viresh Kumar <viresh.kumar@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _CPUFREQ_GOVERNER_H
+#define _CPUFREQ_GOVERNER_H
+
+#include <linux/cpufreq.h>
+#include <linux/kobject.h>
+#include <linux/mutex.h>
+#include <linux/workqueue.h>
+#include <linux/sysfs.h>
+
+/*
+ * The polling frequency depends on the capability of the processor. Default
+ * polling frequency is 1000 times the transition latency of the processor. The
+ * governor will work on any processor with transition latency <= 10mS, using
+ * appropriate sampling rate.
+ *
+ * For CPUs with transition latency > 10mS (mostly drivers with CPUFREQ_ETERNAL)
+ * this governor will not work. All times here are in uS.
+ */
+#define MIN_SAMPLING_RATE_RATIO (2)
+#define LATENCY_MULTIPLIER (1000)
+#define MIN_LATENCY_MULTIPLIER (100)
+#define TRANSITION_LATENCY_LIMIT (10 * 1000 * 1000)
+
+/* Ondemand Sampling types */
+enum {OD_NORMAL_SAMPLE, OD_SUB_SAMPLE};
+
+/* Macro creating sysfs show routines */
+#define show_one(_gov, file_name, object) \
+static ssize_t show_##file_name \
+(struct kobject *kobj, struct attribute *attr, char *buf) \
+{ \
+ return sprintf(buf, "%u\n", _gov##_tuners.object); \
+}
+
+#define define_get_cpu_dbs_routines(_dbs_info) \
+static struct cpu_dbs_common_info *get_cpu_cdbs(int cpu) \
+{ \
+ return &per_cpu(_dbs_info, cpu).cdbs; \
+} \
+ \
+static void *get_cpu_dbs_info_s(int cpu) \
+{ \
+ return &per_cpu(_dbs_info, cpu); \
+}
+
+/*
+ * Abbreviations:
+ * dbs: used as a shortform for demand based switching It helps to keep variable
+ * names smaller, simpler
+ * cdbs: common dbs
+ * on_*: On-demand governor
+ * cs_*: Conservative governor
+ */
+
+/* Per cpu structures */
+struct cpu_dbs_common_info {
+ int cpu;
+ u64 prev_cpu_idle;
+ u64 prev_cpu_wall;
+ u64 prev_cpu_nice;
+ struct cpufreq_policy *cur_policy;
+ struct delayed_work work;
+ /*
+ * percpu mutex that serializes governor limit change with gov_dbs_timer
+ * invocation. We do not want gov_dbs_timer to run when user is changing
+ * the governor or limits.
+ */
+ struct mutex timer_mutex;
+};
+
+struct od_cpu_dbs_info_s {
+ struct cpu_dbs_common_info cdbs;
+ u64 prev_cpu_iowait;
+ struct cpufreq_frequency_table *freq_table;
+ unsigned int freq_lo;
+ unsigned int freq_lo_jiffies;
+ unsigned int freq_hi_jiffies;
+ unsigned int rate_mult;
+ unsigned int sample_type:1;
+};
+
+struct cs_cpu_dbs_info_s {
+ struct cpu_dbs_common_info cdbs;
+ unsigned int down_skip;
+ unsigned int requested_freq;
+ unsigned int enable:1;
+};
+
+/* Governers sysfs tunables */
+struct od_dbs_tuners {
+ unsigned int ignore_nice;
+ unsigned int sampling_rate;
+ unsigned int sampling_down_factor;
+ unsigned int up_threshold;
+ unsigned int down_differential;
+ unsigned int powersave_bias;
+ unsigned int io_is_busy;
+};
+
+struct cs_dbs_tuners {
+ unsigned int ignore_nice;
+ unsigned int sampling_rate;
+ unsigned int sampling_down_factor;
+ unsigned int up_threshold;
+ unsigned int down_threshold;
+ unsigned int freq_step;
+};
+
+/* Per Governer data */
+struct dbs_data {
+ /* Common across governors */
+ #define GOV_ONDEMAND 0
+ #define GOV_CONSERVATIVE 1
+ int governor;
+ unsigned int min_sampling_rate;
+ unsigned int enable; /* number of CPUs using this policy */
+ struct attribute_group *attr_group;
+ void *tuners;
+
+ /* dbs_mutex protects dbs_enable in governor start/stop */
+ struct mutex mutex;
+
+ struct cpu_dbs_common_info *(*get_cpu_cdbs)(int cpu);
+ void *(*get_cpu_dbs_info_s)(int cpu);
+ void (*gov_dbs_timer)(struct work_struct *work);
+ void (*gov_check_cpu)(int cpu, unsigned int load);
+
+ /* Governor specific ops, see below */
+ void *gov_ops;
+};
+
+/* Governor specific ops, will be passed to dbs_data->gov_ops */
+struct od_ops {
+ int (*io_busy)(void);
+ void (*powersave_bias_init_cpu)(int cpu);
+ unsigned int (*powersave_bias_target)(struct cpufreq_policy *policy,
+ unsigned int freq_next, unsigned int relation);
+ void (*freq_increase)(struct cpufreq_policy *p, unsigned int freq);
+};
+
+struct cs_ops {
+ struct notifier_block *notifier_block;
+};
+
+static inline int delay_for_sampling_rate(unsigned int sampling_rate)
+{
+ int delay = usecs_to_jiffies(sampling_rate);
+
+ /* We want all CPUs to do sampling nearly on same jiffy */
+ if (num_online_cpus() > 1)
+ delay -= jiffies % delay;
+
+ return delay;
+}
+
+u64 get_cpu_idle_time(unsigned int cpu, u64 *wall);
+void dbs_check_cpu(struct dbs_data *dbs_data, int cpu);
+int cpufreq_governor_dbs(struct dbs_data *dbs_data,
+ struct cpufreq_policy *policy, unsigned int event);
+#endif /* _CPUFREQ_GOVERNER_H */
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index 396322f2a83..7731f7c7e79 100644
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -10,24 +10,23 @@
* published by the Free Software Foundation.
*/
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/cpufreq.h>
-#include <linux/cpu.h>
-#include <linux/jiffies.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
#include <linux/kernel_stat.h>
+#include <linux/kobject.h>
+#include <linux/module.h>
#include <linux/mutex.h>
-#include <linux/hrtimer.h>
+#include <linux/percpu-defs.h>
+#include <linux/sysfs.h>
#include <linux/tick.h>
-#include <linux/ktime.h>
-#include <linux/sched.h>
+#include <linux/types.h>
-/*
- * dbs is used in this file as a shortform for demandbased switching
- * It helps to keep variable names smaller, simpler
- */
+#include "cpufreq_governor.h"
+/* On-demand governor macors */
#define DEF_FREQUENCY_DOWN_DIFFERENTIAL (10)
#define DEF_FREQUENCY_UP_THRESHOLD (80)
#define DEF_SAMPLING_DOWN_FACTOR (1)
@@ -38,80 +37,14 @@
#define MIN_FREQUENCY_UP_THRESHOLD (11)
#define MAX_FREQUENCY_UP_THRESHOLD (100)
-/*
- * The polling frequency of this governor depends on the capability of
- * the processor. Default polling frequency is 1000 times the transition
- * latency of the processor. The governor will work on any processor with
- * transition latency <= 10mS, using appropriate sampling
- * rate.
- * For CPUs with transition latency > 10mS (mostly drivers with CPUFREQ_ETERNAL)
- * this governor will not work.
- * All times here are in uS.
- */
-#define MIN_SAMPLING_RATE_RATIO (2)
-
-static unsigned int min_sampling_rate;
-
-#define LATENCY_MULTIPLIER (1000)
-#define MIN_LATENCY_MULTIPLIER (100)
-#define TRANSITION_LATENCY_LIMIT (10 * 1000 * 1000)
-
-static void do_dbs_timer(struct work_struct *work);
-static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
- unsigned int event);
+static struct dbs_data od_dbs_data;
+static DEFINE_PER_CPU(struct od_cpu_dbs_info_s, od_cpu_dbs_info);
#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND
-static
+static struct cpufreq_governor cpufreq_gov_ondemand;
#endif
-struct cpufreq_governor cpufreq_gov_ondemand = {
- .name = "ondemand",
- .governor = cpufreq_governor_dbs,
- .max_transition_latency = TRANSITION_LATENCY_LIMIT,
- .owner = THIS_MODULE,
-};
-/* Sampling types */
-enum {DBS_NORMAL_SAMPLE, DBS_SUB_SAMPLE};
-
-struct cpu_dbs_info_s {
- cputime64_t prev_cpu_idle;
- cputime64_t prev_cpu_iowait;
- cputime64_t prev_cpu_wall;
- cputime64_t prev_cpu_nice;
- struct cpufreq_policy *cur_policy;
- struct delayed_work work;
- struct cpufreq_frequency_table *freq_table;
- unsigned int freq_lo;
- unsigned int freq_lo_jiffies;
- unsigned int freq_hi_jiffies;
- unsigned int rate_mult;
- int cpu;
- unsigned int sample_type:1;
- /*
- * percpu mutex that serializes governor limit change with
- * do_dbs_timer invocation. We do not want do_dbs_timer to run
- * when user is changing the governor or limits.
- */
- struct mutex timer_mutex;
-};
-static DEFINE_PER_CPU(struct cpu_dbs_info_s, od_cpu_dbs_info);
-
-static unsigned int dbs_enable; /* number of CPUs using this policy */
-
-/*
- * dbs_mutex protects dbs_enable in governor start/stop.
- */
-static DEFINE_MUTEX(dbs_mutex);
-
-static struct dbs_tuners {
- unsigned int sampling_rate;
- unsigned int up_threshold;
- unsigned int down_differential;
- unsigned int ignore_nice;
- unsigned int sampling_down_factor;
- unsigned int powersave_bias;
- unsigned int io_is_busy;
-} dbs_tuners_ins = {
+static struct od_dbs_tuners od_tuners = {
.up_threshold = DEF_FREQUENCY_UP_THRESHOLD,
.sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR,
.down_differential = DEF_FREQUENCY_DOWN_DIFFERENTIAL,
@@ -119,48 +52,35 @@ static struct dbs_tuners {
.powersave_bias = 0,
};
-static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall)
-{
- u64 idle_time;
- u64 cur_wall_time;
- u64 busy_time;
-
- cur_wall_time = jiffies64_to_cputime64(get_jiffies_64());
-
- busy_time = kcpustat_cpu(cpu).cpustat[CPUTIME_USER];
- busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SYSTEM];
- busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_IRQ];
- busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SOFTIRQ];
- busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_STEAL];
- busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE];
-
- idle_time = cur_wall_time - busy_time;
- if (wall)
- *wall = jiffies_to_usecs(cur_wall_time);
-
- return jiffies_to_usecs(idle_time);
-}
-
-static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall)
+static void ondemand_powersave_bias_init_cpu(int cpu)
{
- u64 idle_time = get_cpu_idle_time_us(cpu, NULL);
-
- if (idle_time == -1ULL)
- return get_cpu_idle_time_jiffy(cpu, wall);
- else
- idle_time += get_cpu_iowait_time_us(cpu, wall);
+ struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu);
- return idle_time;
+ dbs_info->freq_table = cpufreq_frequency_get_table(cpu);
+ dbs_info->freq_lo = 0;
}
-static inline cputime64_t get_cpu_iowait_time(unsigned int cpu, cputime64_t *wall)
+/*
+ * Not all CPUs want IO time to be accounted as busy; this depends on how
+ * efficient idling at a higher frequency/voltage is.
+ * Pavel Machek says this is not so for various generations of AMD and old
+ * Intel systems.
+ * Mike Chan (androidlcom) calis this is also not true for ARM.
+ * Because of this, whitelist specific known (series) of CPUs by default, and
+ * leave all others up to the user.
+ */
+static int should_io_be_busy(void)
{
- u64 iowait_time = get_cpu_iowait_time_us(cpu, wall);
-
- if (iowait_time == -1ULL)
- return 0;
-
- return iowait_time;
+#if defined(CONFIG_X86)
+ /*
+ * For Intel, Core 2 (model 15) andl later have an efficient idle.
+ */
+ if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
+ boot_cpu_data.x86 == 6 &&
+ boot_cpu_data.x86_model >= 15)
+ return 1;
+#endif
+ return 0;
}
/*
@@ -169,14 +89,13 @@ static inline cputime64_t get_cpu_iowait_time(unsigned int cpu, cputime64_t *wal
* freq_lo, and freq_lo_jiffies in percpu area for averaging freqs.
*/
static unsigned int powersave_bias_target(struct cpufreq_policy *policy,
- unsigned int freq_next,
- unsigned int relation)
+ unsigned int freq_next, unsigned int relation)
{
unsigned int freq_req, freq_reduc, freq_avg;
unsigned int freq_hi, freq_lo;
unsigned int index = 0;
unsigned int jiffies_total, jiffies_hi, jiffies_lo;
- struct cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info,
+ struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info,
policy->cpu);
if (!dbs_info->freq_table) {
@@ -188,7 +107,7 @@ static unsigned int powersave_bias_target(struct cpufreq_policy *policy,
cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_next,
relation, &index);
freq_req = dbs_info->freq_table[index].frequency;
- freq_reduc = freq_req * dbs_tuners_ins.powersave_bias / 1000;
+ freq_reduc = freq_req * od_tuners.powersave_bias / 1000;
freq_avg = freq_req - freq_reduc;
/* Find freq bounds for freq_avg in freq_table */
@@ -207,7 +126,7 @@ static unsigned int powersave_bias_target(struct cpufreq_policy *policy,
dbs_info->freq_lo_jiffies = 0;
return freq_lo;
}
- jiffies_total = usecs_to_jiffies(dbs_tuners_ins.sampling_rate);
+ jiffies_total = usecs_to_jiffies(od_tuners.sampling_rate);
jiffies_hi = (freq_avg - freq_lo) * jiffies_total;
jiffies_hi += ((freq_hi - freq_lo) / 2);
jiffies_hi /= (freq_hi - freq_lo);
@@ -218,13 +137,6 @@ static unsigned int powersave_bias_target(struct cpufreq_policy *policy,
return freq_hi;
}
-static void ondemand_powersave_bias_init_cpu(int cpu)
-{
- struct cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu);
- dbs_info->freq_table = cpufreq_frequency_get_table(cpu);
- dbs_info->freq_lo = 0;
-}
-
static void ondemand_powersave_bias_init(void)
{
int i;
@@ -233,83 +145,173 @@ static void ondemand_powersave_bias_init(void)
}
}
-/************************** sysfs interface ************************/
+static void dbs_freq_increase(struct cpufreq_policy *p, unsigned int freq)
+{
+ if (od_tuners.powersave_bias)
+ freq = powersave_bias_target(p, freq, CPUFREQ_RELATION_H);
+ else if (p->cur == p->max)
+ return;
-static ssize_t show_sampling_rate_min(struct kobject *kobj,
- struct attribute *attr, char *buf)
+ __cpufreq_driver_target(p, freq, od_tuners.powersave_bias ?
+ CPUFREQ_RELATION_L : CPUFREQ_RELATION_H);
+}
+
+/*
+ * Every sampling_rate, we check, if current idle time is less than 20%
+ * (default), then we try to increase frequency Every sampling_rate, we look for
+ * a the lowest frequency which can sustain the load while keeping idle time
+ * over 30%. If such a frequency exist, we try to decrease to this frequency.
+ *
+ * Any frequency increase takes it to the maximum frequency. Frequency reduction
+ * happens at minimum steps of 5% (default) of current frequency
+ */
+static void od_check_cpu(int cpu, unsigned int load_freq)
{
- return sprintf(buf, "%u\n", min_sampling_rate);
+ struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu);
+ struct cpufreq_policy *policy = dbs_info->cdbs.cur_policy;
+
+ dbs_info->freq_lo = 0;
+
+ /* Check for frequency increase */
+ if (load_freq > od_tuners.up_threshold * policy->cur) {
+ /* If switching to max speed, apply sampling_down_factor */
+ if (policy->cur < policy->max)
+ dbs_info->rate_mult =
+ od_tuners.sampling_down_factor;
+ dbs_freq_increase(policy, policy->max);
+ return;
+ }
+
+ /* Check for frequency decrease */
+ /* if we cannot reduce the frequency anymore, break out early */
+ if (policy->cur == policy->min)
+ return;
+
+ /*
+ * The optimal frequency is the frequency that is the lowest that can
+ * support the current CPU usage without triggering the up policy. To be
+ * safe, we focus 10 points under the threshold.
+ */
+ if (load_freq < (od_tuners.up_threshold - od_tuners.down_differential) *
+ policy->cur) {
+ unsigned int freq_next;
+ freq_next = load_freq / (od_tuners.up_threshold -
+ od_tuners.down_differential);
+
+ /* No longer fully busy, reset rate_mult */
+ dbs_info->rate_mult = 1;
+
+ if (freq_next < policy->min)
+ freq_next = policy->min;
+
+ if (!od_tuners.powersave_bias) {
+ __cpufreq_driver_target(policy, freq_next,
+ CPUFREQ_RELATION_L);
+ } else {
+ int freq = powersave_bias_target(policy, freq_next,
+ CPUFREQ_RELATION_L);
+ __cpufreq_driver_target(policy, freq,
+ CPUFREQ_RELATION_L);
+ }
+ }
}
-define_one_global_ro(sampling_rate_min);
+static void od_dbs_timer(struct work_struct *work)
+{
+ struct od_cpu_dbs_info_s *dbs_info =
+ container_of(work, struct od_cpu_dbs_info_s, cdbs.work.work);
+ unsigned int cpu = dbs_info->cdbs.cpu;
+ int delay, sample_type = dbs_info->sample_type;
+
+ mutex_lock(&dbs_info->cdbs.timer_mutex);
+
+ /* Common NORMAL_SAMPLE setup */
+ dbs_info->sample_type = OD_NORMAL_SAMPLE;
+ if (sample_type == OD_SUB_SAMPLE) {
+ delay = dbs_info->freq_lo_jiffies;
+ __cpufreq_driver_target(dbs_info->cdbs.cur_policy,
+ dbs_info->freq_lo, CPUFREQ_RELATION_H);
+ } else {
+ dbs_check_cpu(&od_dbs_data, cpu);
+ if (dbs_info->freq_lo) {
+ /* Setup timer for SUB_SAMPLE */
+ dbs_info->sample_type = OD_SUB_SAMPLE;
+ delay = dbs_info->freq_hi_jiffies;
+ } else {
+ delay = delay_for_sampling_rate(od_tuners.sampling_rate
+ * dbs_info->rate_mult);
+ }
+ }
+
+ schedule_delayed_work_on(cpu, &dbs_info->cdbs.work, delay);
+ mutex_unlock(&dbs_info->cdbs.timer_mutex);
+}
+
+/************************** sysfs interface ************************/
-/* cpufreq_ondemand Governor Tunables */
-#define show_one(file_name, object) \
-static ssize_t show_##file_name \
-(struct kobject *kobj, struct attribute *attr, char *buf) \
-{ \
- return sprintf(buf, "%u\n", dbs_tuners_ins.object); \
+static ssize_t show_sampling_rate_min(struct kobject *kobj,
+ struct attribute *attr, char *buf)
+{
+ return sprintf(buf, "%u\n", od_dbs_data.min_sampling_rate);
}
-show_one(sampling_rate, sampling_rate);
-show_one(io_is_busy, io_is_busy);
-show_one(up_threshold, up_threshold);
-show_one(sampling_down_factor, sampling_down_factor);
-show_one(ignore_nice_load, ignore_nice);
-show_one(powersave_bias, powersave_bias);
/**
* update_sampling_rate - update sampling rate effective immediately if needed.
* @new_rate: new sampling rate
*
* If new rate is smaller than the old, simply updaing
- * dbs_tuners_int.sampling_rate might not be appropriate. For example,
- * if the original sampling_rate was 1 second and the requested new sampling
- * rate is 10 ms because the user needs immediate reaction from ondemand
- * governor, but not sure if higher frequency will be required or not,
- * then, the governor may change the sampling rate too late; up to 1 second
- * later. Thus, if we are reducing the sampling rate, we need to make the
- * new value effective immediately.
+ * dbs_tuners_int.sampling_rate might not be appropriate. For example, if the
+ * original sampling_rate was 1 second and the requested new sampling rate is 10
+ * ms because the user needs immediate reaction from ondemand governor, but not
+ * sure if higher frequency will be required or not, then, the governor may
+ * change the sampling rate too late; up to 1 second later. Thus, if we are
+ * reducing the sampling rate, we need to make the new value effective
+ * immediately.
*/
static void update_sampling_rate(unsigned int new_rate)
{
int cpu;
- dbs_tuners_ins.sampling_rate = new_rate
- = max(new_rate, min_sampling_rate);
+ od_tuners.sampling_rate = new_rate = max(new_rate,
+ od_dbs_data.min_sampling_rate);
for_each_online_cpu(cpu) {
struct cpufreq_policy *policy;
- struct cpu_dbs_info_s *dbs_info;
+ struct od_cpu_dbs_info_s *dbs_info;
unsigned long next_sampling, appointed_at;
policy = cpufreq_cpu_get(cpu);
if (!policy)
continue;
+ if (policy->governor != &cpufreq_gov_ondemand) {
+ cpufreq_cpu_put(policy);
+ continue;
+ }
dbs_info = &per_cpu(od_cpu_dbs_info, policy->cpu);
cpufreq_cpu_put(policy);
- mutex_lock(&dbs_info->timer_mutex);
+ mutex_lock(&dbs_info->cdbs.timer_mutex);
- if (!delayed_work_pending(&dbs_info->work)) {
- mutex_unlock(&dbs_info->timer_mutex);
+ if (!delayed_work_pending(&dbs_info->cdbs.work)) {
+ mutex_unlock(&dbs_info->cdbs.timer_mutex);
continue;
}
- next_sampling = jiffies + usecs_to_jiffies(new_rate);
- appointed_at = dbs_info->work.timer.expires;
-
+ next_sampling = jiffies + usecs_to_jiffies(new_rate);
+ appointed_at = dbs_info->cdbs.work.timer.expires;
if (time_before(next_sampling, appointed_at)) {
- mutex_unlock(&dbs_info->timer_mutex);
- cancel_delayed_work_sync(&dbs_info->work);
- mutex_lock(&dbs_info->timer_mutex);
+ mutex_unlock(&dbs_info->cdbs.timer_mutex);
+ cancel_delayed_work_sync(&dbs_info->cdbs.work);
+ mutex_lock(&dbs_info->cdbs.timer_mutex);
- schedule_delayed_work_on(dbs_info->cpu, &dbs_info->work,
- usecs_to_jiffies(new_rate));
+ schedule_delayed_work_on(dbs_info->cdbs.cpu,
+ &dbs_info->cdbs.work,
+ usecs_to_jiffies(new_rate));
}
- mutex_unlock(&dbs_info->timer_mutex);
+ mutex_unlock(&dbs_info->cdbs.timer_mutex);
}
}
@@ -334,7 +336,7 @@ static ssize_t store_io_is_busy(struct kobject *a, struct attribute *b,
ret = sscanf(buf, "%u", &input);
if (ret != 1)
return -EINVAL;
- dbs_tuners_ins.io_is_busy = !!input;
+ od_tuners.io_is_busy = !!input;
return count;
}
@@ -349,7 +351,7 @@ static ssize_t store_up_threshold(struct kobject *a, struct attribute *b,
input < MIN_FREQUENCY_UP_THRESHOLD) {
return -EINVAL;
}
- dbs_tuners_ins.up_threshold = input;
+ od_tuners.up_threshold = input;
return count;
}
@@ -362,12 +364,12 @@ static ssize_t store_sampling_down_factor(struct kobject *a,
if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1)
return -EINVAL;
- dbs_tuners_ins.sampling_down_factor = input;
+ od_tuners.sampling_down_factor = input;
/* Reset down sampling multiplier in case it was active */
for_each_online_cpu(j) {
- struct cpu_dbs_info_s *dbs_info;
- dbs_info = &per_cpu(od_cpu_dbs_info, j);
+ struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info,
+ j);
dbs_info->rate_mult = 1;
}
return count;
@@ -388,19 +390,20 @@ static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b,
if (input > 1)
input = 1;
- if (input == dbs_tuners_ins.ignore_nice) { /* nothing to do */
+ if (input == od_tuners.ignore_nice) { /* nothing to do */
return count;
}
- dbs_tuners_ins.ignore_nice = input;
+ od_tuners.ignore_nice = input;
/* we need to re-evaluate prev_cpu_idle */
for_each_online_cpu(j) {
- struct cpu_dbs_info_s *dbs_info;
+ struct od_cpu_dbs_info_s *dbs_info;
dbs_info = &per_cpu(od_cpu_dbs_info, j);
- dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
- &dbs_info->prev_cpu_wall);
- if (dbs_tuners_ins.ignore_nice)
- dbs_info->prev_cpu_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE];
+ dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j,
+ &dbs_info->cdbs.prev_cpu_wall);
+ if (od_tuners.ignore_nice)
+ dbs_info->cdbs.prev_cpu_nice =
+ kcpustat_cpu(j).cpustat[CPUTIME_NICE];
}
return count;
@@ -419,17 +422,25 @@ static ssize_t store_powersave_bias(struct kobject *a, struct attribute *b,
if (input > 1000)
input = 1000;
- dbs_tuners_ins.powersave_bias = input;
+ od_tuners.powersave_bias = input;
ondemand_powersave_bias_init();
return count;
}
+show_one(od, sampling_rate, sampling_rate);
+show_one(od, io_is_busy, io_is_busy);
+show_one(od, up_threshold, up_threshold);
+show_one(od, sampling_down_factor, sampling_down_factor);
+show_one(od, ignore_nice_load, ignore_nice);
+show_one(od, powersave_bias, powersave_bias);
+
define_one_global_rw(sampling_rate);
define_one_global_rw(io_is_busy);
define_one_global_rw(up_threshold);
define_one_global_rw(sampling_down_factor);
define_one_global_rw(ignore_nice_load);
define_one_global_rw(powersave_bias);
+define_one_global_ro(sampling_rate_min);
static struct attribute *dbs_attributes[] = {
&sampling_rate_min.attr,
@@ -442,354 +453,71 @@ static struct attribute *dbs_attributes[] = {
NULL
};
-static struct attribute_group dbs_attr_group = {
+static struct attribute_group od_attr_group = {
.attrs = dbs_attributes,
.name = "ondemand",
};
/************************** sysfs end ************************/
-static void dbs_freq_increase(struct cpufreq_policy *p, unsigned int freq)
-{
- if (dbs_tuners_ins.powersave_bias)
- freq = powersave_bias_target(p, freq, CPUFREQ_RELATION_H);
- else if (p->cur == p->max)
- return;
-
- __cpufreq_driver_target(p, freq, dbs_tuners_ins.powersave_bias ?
- CPUFREQ_RELATION_L : CPUFREQ_RELATION_H);
-}
-
-static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
-{
- unsigned int max_load_freq;
-
- struct cpufreq_policy *policy;
- unsigned int j;
-
- this_dbs_info->freq_lo = 0;
- policy = this_dbs_info->cur_policy;
-
- /*
- * Every sampling_rate, we check, if current idle time is less
- * than 20% (default), then we try to increase frequency
- * Every sampling_rate, we look for a the lowest
- * frequency which can sustain the load while keeping idle time over
- * 30%. If such a frequency exist, we try to decrease to this frequency.
- *
- * Any frequency increase takes it to the maximum frequency.
- * Frequency reduction happens at minimum steps of
- * 5% (default) of current frequency
- */
-
- /* Get Absolute Load - in terms of freq */
- max_load_freq = 0;
-
- for_each_cpu(j, policy->cpus) {
- struct cpu_dbs_info_s *j_dbs_info;
- cputime64_t cur_wall_time, cur_idle_time, cur_iowait_time;
- unsigned int idle_time, wall_time, iowait_time;
- unsigned int load, load_freq;
- int freq_avg;
-
- j_dbs_info = &per_cpu(od_cpu_dbs_info, j);
-
- cur_idle_time = get_cpu_idle_time(j, &cur_wall_time);
- cur_iowait_time = get_cpu_iowait_time(j, &cur_wall_time);
-
- wall_time = (unsigned int)
- (cur_wall_time - j_dbs_info->prev_cpu_wall);
- j_dbs_info->prev_cpu_wall = cur_wall_time;
-
- idle_time = (unsigned int)
- (cur_idle_time - j_dbs_info->prev_cpu_idle);
- j_dbs_info->prev_cpu_idle = cur_idle_time;
-
- iowait_time = (unsigned int)
- (cur_iowait_time - j_dbs_info->prev_cpu_iowait);
- j_dbs_info->prev_cpu_iowait = cur_iowait_time;
-
- if (dbs_tuners_ins.ignore_nice) {
- u64 cur_nice;
- unsigned long cur_nice_jiffies;
-
- cur_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE] -
- j_dbs_info->prev_cpu_nice;
- /*
- * Assumption: nice time between sampling periods will
- * be less than 2^32 jiffies for 32 bit sys
- */
- cur_nice_jiffies = (unsigned long)
- cputime64_to_jiffies64(cur_nice);
-
- j_dbs_info->prev_cpu_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE];
- idle_time += jiffies_to_usecs(cur_nice_jiffies);
- }
-
- /*
- * For the purpose of ondemand, waiting for disk IO is an
- * indication that you're performance critical, and not that
- * the system is actually idle. So subtract the iowait time
- * from the cpu idle time.
- */
-
- if (dbs_tuners_ins.io_is_busy && idle_time >= iowait_time)
- idle_time -= iowait_time;
-
- if (unlikely(!wall_time || wall_time < idle_time))
- continue;
-
- load = 100 * (wall_time - idle_time) / wall_time;
-
- freq_avg = __cpufreq_driver_getavg(policy, j);
- if (freq_avg <= 0)
- freq_avg = policy->cur;
-
- load_freq = load * freq_avg;
- if (load_freq > max_load_freq)
- max_load_freq = load_freq;
- }
+define_get_cpu_dbs_routines(od_cpu_dbs_info);
- /* Check for frequency increase */
- if (max_load_freq > dbs_tuners_ins.up_threshold * policy->cur) {
- /* If switching to max speed, apply sampling_down_factor */
- if (policy->cur < policy->max)
- this_dbs_info->rate_mult =
- dbs_tuners_ins.sampling_down_factor;
- dbs_freq_increase(policy, policy->max);
- return;
- }
-
- /* Check for frequency decrease */
- /* if we cannot reduce the frequency anymore, break out early */
- if (policy->cur == policy->min)
- return;
-
- /*
- * The optimal frequency is the frequency that is the lowest that
- * can support the current CPU usage without triggering the up
- * policy. To be safe, we focus 10 points under the threshold.
- */
- if (max_load_freq <
- (dbs_tuners_ins.up_threshold - dbs_tuners_ins.down_differential) *
- policy->cur) {
- unsigned int freq_next;
- freq_next = max_load_freq /
- (dbs_tuners_ins.up_threshold -
- dbs_tuners_ins.down_differential);
-
- /* No longer fully busy, reset rate_mult */
- this_dbs_info->rate_mult = 1;
-
- if (freq_next < policy->min)
- freq_next = policy->min;
-
- if (!dbs_tuners_ins.powersave_bias) {
- __cpufreq_driver_target(policy, freq_next,
- CPUFREQ_RELATION_L);
- } else {
- int freq = powersave_bias_target(policy, freq_next,
- CPUFREQ_RELATION_L);
- __cpufreq_driver_target(policy, freq,
- CPUFREQ_RELATION_L);
- }
- }
-}
-
-static void do_dbs_timer(struct work_struct *work)
-{
- struct cpu_dbs_info_s *dbs_info =
- container_of(work, struct cpu_dbs_info_s, work.work);
- unsigned int cpu = dbs_info->cpu;
- int sample_type = dbs_info->sample_type;
-
- int delay;
-
- mutex_lock(&dbs_info->timer_mutex);
-
- /* Common NORMAL_SAMPLE setup */
- dbs_info->sample_type = DBS_NORMAL_SAMPLE;
- if (!dbs_tuners_ins.powersave_bias ||
- sample_type == DBS_NORMAL_SAMPLE) {
- dbs_check_cpu(dbs_info);
- if (dbs_info->freq_lo) {
- /* Setup timer for SUB_SAMPLE */
- dbs_info->sample_type = DBS_SUB_SAMPLE;
- delay = dbs_info->freq_hi_jiffies;
- } else {
- /* We want all CPUs to do sampling nearly on
- * same jiffy
- */
- delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate
- * dbs_info->rate_mult);
-
- if (num_online_cpus() > 1)
- delay -= jiffies % delay;
- }
- } else {
- __cpufreq_driver_target(dbs_info->cur_policy,
- dbs_info->freq_lo, CPUFREQ_RELATION_H);
- delay = dbs_info->freq_lo_jiffies;
- }
- schedule_delayed_work_on(cpu, &dbs_info->work, delay);
- mutex_unlock(&dbs_info->timer_mutex);
-}
-
-static inline void dbs_timer_init(struct cpu_dbs_info_s *dbs_info)
-{
- /* We want all CPUs to do sampling nearly on same jiffy */
- int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate);
-
- if (num_online_cpus() > 1)
- delay -= jiffies % delay;
+static struct od_ops od_ops = {
+ .io_busy = should_io_be_busy,
+ .powersave_bias_init_cpu = ondemand_powersave_bias_init_cpu,
+ .powersave_bias_target = powersave_bias_target,
+ .freq_increase = dbs_freq_increase,
+};
- dbs_info->sample_type = DBS_NORMAL_SAMPLE;
- INIT_DEFERRABLE_WORK(&dbs_info->work, do_dbs_timer);
- schedule_delayed_work_on(dbs_info->cpu, &dbs_info->work, delay);
-}
+static struct dbs_data od_dbs_data = {
+ .governor = GOV_ONDEMAND,
+ .attr_group = &od_attr_group,
+ .tuners = &od_tuners,
+ .get_cpu_cdbs = get_cpu_cdbs,
+ .get_cpu_dbs_info_s = get_cpu_dbs_info_s,
+ .gov_dbs_timer = od_dbs_timer,
+ .gov_check_cpu = od_check_cpu,
+ .gov_ops = &od_ops,
+};
-static inline void dbs_timer_exit(struct cpu_dbs_info_s *dbs_info)
+static int od_cpufreq_governor_dbs(struct cpufreq_policy *policy,
+ unsigned int event)
{
- cancel_delayed_work_sync(&dbs_info->work);
+ return cpufreq_governor_dbs(&od_dbs_data, policy, event);
}
-/*
- * Not all CPUs want IO time to be accounted as busy; this dependson how
- * efficient idling at a higher frequency/voltage is.
- * Pavel Machek says this is not so for various generations of AMD and old
- * Intel systems.
- * Mike Chan (androidlcom) calis this is also not true for ARM.
- * Because of this, whitelist specific known (series) of CPUs by default, and
- * leave all others up to the user.
- */
-static int should_io_be_busy(void)
-{
-#if defined(CONFIG_X86)
- /*
- * For Intel, Core 2 (model 15) andl later have an efficient idle.
- */
- if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
- boot_cpu_data.x86 == 6 &&
- boot_cpu_data.x86_model >= 15)
- return 1;
+#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND
+static
#endif
- return 0;
-}
-
-static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
- unsigned int event)
-{
- unsigned int cpu = policy->cpu;
- struct cpu_dbs_info_s *this_dbs_info;
- unsigned int j;
- int rc;
-
- this_dbs_info = &per_cpu(od_cpu_dbs_info, cpu);
-
- switch (event) {
- case CPUFREQ_GOV_START:
- if ((!cpu_online(cpu)) || (!policy->cur))
- return -EINVAL;
-
- mutex_lock(&dbs_mutex);
-
- dbs_enable++;
- for_each_cpu(j, policy->cpus) {
- struct cpu_dbs_info_s *j_dbs_info;
- j_dbs_info = &per_cpu(od_cpu_dbs_info, j);
- j_dbs_info->cur_policy = policy;
-
- j_dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
- &j_dbs_info->prev_cpu_wall);
- if (dbs_tuners_ins.ignore_nice)
- j_dbs_info->prev_cpu_nice =
- kcpustat_cpu(j).cpustat[CPUTIME_NICE];
- }
- this_dbs_info->cpu = cpu;
- this_dbs_info->rate_mult = 1;
- ondemand_powersave_bias_init_cpu(cpu);
- /*
- * Start the timerschedule work, when this governor
- * is used for first time
- */
- if (dbs_enable == 1) {
- unsigned int latency;
-
- rc = sysfs_create_group(cpufreq_global_kobject,
- &dbs_attr_group);
- if (rc) {
- mutex_unlock(&dbs_mutex);
- return rc;
- }
-
- /* policy latency is in nS. Convert it to uS first */
- latency = policy->cpuinfo.transition_latency / 1000;
- if (latency == 0)
- latency = 1;
- /* Bring kernel and HW constraints together */
- min_sampling_rate = max(min_sampling_rate,
- MIN_LATENCY_MULTIPLIER * latency);
- dbs_tuners_ins.sampling_rate =
- max(min_sampling_rate,
- latency * LATENCY_MULTIPLIER);
- dbs_tuners_ins.io_is_busy = should_io_be_busy();
- }
- mutex_unlock(&dbs_mutex);
-
- mutex_init(&this_dbs_info->timer_mutex);
- dbs_timer_init(this_dbs_info);
- break;
-
- case CPUFREQ_GOV_STOP:
- dbs_timer_exit(this_dbs_info);
-
- mutex_lock(&dbs_mutex);
- mutex_destroy(&this_dbs_info->timer_mutex);
- dbs_enable--;
- mutex_unlock(&dbs_mutex);
- if (!dbs_enable)
- sysfs_remove_group(cpufreq_global_kobject,
- &dbs_attr_group);
-
- break;
-
- case CPUFREQ_GOV_LIMITS:
- mutex_lock(&this_dbs_info->timer_mutex);
- if (policy->max < this_dbs_info->cur_policy->cur)
- __cpufreq_driver_target(this_dbs_info->cur_policy,
- policy->max, CPUFREQ_RELATION_H);
- else if (policy->min > this_dbs_info->cur_policy->cur)
- __cpufreq_driver_target(this_dbs_info->cur_policy,
- policy->min, CPUFREQ_RELATION_L);
- dbs_check_cpu(this_dbs_info);
- mutex_unlock(&this_dbs_info->timer_mutex);
- break;
- }
- return 0;
-}
+struct cpufreq_governor cpufreq_gov_ondemand = {
+ .name = "ondemand",
+ .governor = od_cpufreq_governor_dbs,
+ .max_transition_latency = TRANSITION_LATENCY_LIMIT,
+ .owner = THIS_MODULE,
+};
static int __init cpufreq_gov_dbs_init(void)
{
u64 idle_time;
int cpu = get_cpu();
+ mutex_init(&od_dbs_data.mutex);
idle_time = get_cpu_idle_time_us(cpu, NULL);
put_cpu();
if (idle_time != -1ULL) {
/* Idle micro accounting is supported. Use finer thresholds */
- dbs_tuners_ins.up_threshold = MICRO_FREQUENCY_UP_THRESHOLD;
- dbs_tuners_ins.down_differential =
- MICRO_FREQUENCY_DOWN_DIFFERENTIAL;
+ od_tuners.up_threshold = MICRO_FREQUENCY_UP_THRESHOLD;
+ od_tuners.down_differential = MICRO_FREQUENCY_DOWN_DIFFERENTIAL;
/*
* In nohz/micro accounting case we set the minimum frequency
* not depending on HZ, but fixed (very low). The deferred
* timer might skip some samples if idle/sleeping as needed.
*/
- min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE;
+ od_dbs_data.min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE;
} else {
/* For correct statistics, we need 10 ticks for each measure */
- min_sampling_rate =
- MIN_SAMPLING_RATE_RATIO * jiffies_to_usecs(10);
+ od_dbs_data.min_sampling_rate = MIN_SAMPLING_RATE_RATIO *
+ jiffies_to_usecs(10);
}
return cpufreq_register_governor(&cpufreq_gov_ondemand);
@@ -800,7 +528,6 @@ static void __exit cpufreq_gov_dbs_exit(void)
cpufreq_unregister_governor(&cpufreq_gov_ondemand);
}
-
MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>");
MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>");
MODULE_DESCRIPTION("'cpufreq_ondemand' - A dynamic cpufreq governor for "
diff --git a/drivers/cpufreq/cpufreq_performance.c b/drivers/cpufreq/cpufreq_performance.c
index f13a8a9af6a..ceee06849b9 100644
--- a/drivers/cpufreq/cpufreq_performance.c
+++ b/drivers/cpufreq/cpufreq_performance.c
@@ -10,6 +10,8 @@
*
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/cpufreq.h>
diff --git a/drivers/cpufreq/cpufreq_powersave.c b/drivers/cpufreq/cpufreq_powersave.c
index 4c2eb512f2b..2d948a17115 100644
--- a/drivers/cpufreq/cpufreq_powersave.c
+++ b/drivers/cpufreq/cpufreq_powersave.c
@@ -10,6 +10,8 @@
*
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/cpufreq.h>
diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
index 399831690fe..9d7732b8104 100644
--- a/drivers/cpufreq/cpufreq_stats.c
+++ b/drivers/cpufreq/cpufreq_stats.c
@@ -37,7 +37,7 @@ struct cpufreq_stats {
unsigned int max_state;
unsigned int state_num;
unsigned int last_index;
- cputime64_t *time_in_state;
+ u64 *time_in_state;
unsigned int *freq_table;
#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
unsigned int *trans_table;
@@ -223,7 +223,7 @@ static int cpufreq_stats_create_table(struct cpufreq_policy *policy,
count++;
}
- alloc_size = count * sizeof(int) + count * sizeof(cputime64_t);
+ alloc_size = count * sizeof(int) + count * sizeof(u64);
#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
alloc_size += count * count * sizeof(int);
@@ -364,18 +364,21 @@ static int __init cpufreq_stats_init(void)
if (ret)
return ret;
+ register_hotcpu_notifier(&cpufreq_stat_cpu_notifier);
+ for_each_online_cpu(cpu)
+ cpufreq_update_policy(cpu);
+
ret = cpufreq_register_notifier(&notifier_trans_block,
CPUFREQ_TRANSITION_NOTIFIER);
if (ret) {
cpufreq_unregister_notifier(&notifier_policy_block,
CPUFREQ_POLICY_NOTIFIER);
+ unregister_hotcpu_notifier(&cpufreq_stat_cpu_notifier);
+ for_each_online_cpu(cpu)
+ cpufreq_stats_free_table(cpu);
return ret;
}
- register_hotcpu_notifier(&cpufreq_stat_cpu_notifier);
- for_each_online_cpu(cpu) {
- cpufreq_update_policy(cpu);
- }
return 0;
}
static void __exit cpufreq_stats_exit(void)
diff --git a/drivers/cpufreq/cpufreq_userspace.c b/drivers/cpufreq/cpufreq_userspace.c
index bedac1aa9be..c8c3d293cc5 100644
--- a/drivers/cpufreq/cpufreq_userspace.c
+++ b/drivers/cpufreq/cpufreq_userspace.c
@@ -11,6 +11,8 @@
*
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/smp.h>
diff --git a/drivers/cpufreq/db8500-cpufreq.c b/drivers/cpufreq/db8500-cpufreq.c
index 74b830b635a..4f154bc0ebe 100644
--- a/drivers/cpufreq/db8500-cpufreq.c
+++ b/drivers/cpufreq/db8500-cpufreq.c
@@ -8,43 +8,17 @@
* Author: Jonas Aaberg <jonas.aberg@stericsson.com>
*
*/
+#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/cpufreq.h>
#include <linux/delay.h>
#include <linux/slab.h>
-#include <linux/mfd/dbx500-prcmu.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
#include <mach/id.h>
-static struct cpufreq_frequency_table freq_table[] = {
- [0] = {
- .index = 0,
- .frequency = 200000,
- },
- [1] = {
- .index = 1,
- .frequency = 400000,
- },
- [2] = {
- .index = 2,
- .frequency = 800000,
- },
- [3] = {
- /* Used for MAX_OPP, if available */
- .index = 3,
- .frequency = CPUFREQ_TABLE_END,
- },
- [4] = {
- .index = 4,
- .frequency = CPUFREQ_TABLE_END,
- },
-};
-
-static enum arm_opp idx2opp[] = {
- ARM_EXTCLK,
- ARM_50_OPP,
- ARM_100_OPP,
- ARM_MAX_OPP
-};
+static struct cpufreq_frequency_table *freq_table;
+static struct clk *armss_clk;
static struct freq_attr *db8500_cpufreq_attr[] = {
&cpufreq_freq_attr_scaling_available_freqs,
@@ -85,9 +59,9 @@ static int db8500_cpufreq_target(struct cpufreq_policy *policy,
for_each_cpu(freqs.cpu, policy->cpus)
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
- /* request the PRCM unit for opp change */
- if (prcmu_set_arm_opp(idx2opp[idx])) {
- pr_err("db8500-cpufreq: Failed to set OPP level\n");
+ /* update armss clk frequency */
+ if (clk_set_rate(armss_clk, freq_table[idx].frequency * 1000)) {
+ pr_err("db8500-cpufreq: Failed to update armss clk\n");
return -EINVAL;
}
@@ -100,25 +74,36 @@ static int db8500_cpufreq_target(struct cpufreq_policy *policy,
static unsigned int db8500_cpufreq_getspeed(unsigned int cpu)
{
- int i;
- /* request the prcm to get the current ARM opp */
- for (i = 0; prcmu_get_arm_opp() != idx2opp[i]; i++)
- ;
- return freq_table[i].frequency;
+ int i = 0;
+ unsigned long freq = clk_get_rate(armss_clk) / 1000;
+
+ while (freq_table[i].frequency != CPUFREQ_TABLE_END) {
+ if (freq <= freq_table[i].frequency)
+ return freq_table[i].frequency;
+ i++;
+ }
+
+ /* We could not find a corresponding frequency. */
+ pr_err("db8500-cpufreq: Failed to find cpufreq speed\n");
+ return 0;
}
static int __cpuinit db8500_cpufreq_init(struct cpufreq_policy *policy)
{
- int i, res;
-
- BUILD_BUG_ON(ARRAY_SIZE(idx2opp) + 1 != ARRAY_SIZE(freq_table));
+ int i = 0;
+ int res;
- if (prcmu_has_arm_maxopp())
- freq_table[3].frequency = 1000000;
+ armss_clk = clk_get(NULL, "armss");
+ if (IS_ERR(armss_clk)) {
+ pr_err("db8500-cpufreq : Failed to get armss clk\n");
+ return PTR_ERR(armss_clk);
+ }
pr_info("db8500-cpufreq : Available frequencies:\n");
- for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++)
+ while (freq_table[i].frequency != CPUFREQ_TABLE_END) {
pr_info(" %d Mhz\n", freq_table[i].frequency/1000);
+ i++;
+ }
/* get policy fields based on the table */
res = cpufreq_frequency_table_cpuinfo(policy, freq_table);
@@ -126,6 +111,7 @@ static int __cpuinit db8500_cpufreq_init(struct cpufreq_policy *policy)
cpufreq_frequency_table_get_attr(freq_table, policy->cpu);
else {
pr_err("db8500-cpufreq : Failed to read policy table\n");
+ clk_put(armss_clk);
return res;
}
@@ -159,12 +145,35 @@ static struct cpufreq_driver db8500_cpufreq_driver = {
.attr = db8500_cpufreq_attr,
};
+static int db8500_cpufreq_probe(struct platform_device *pdev)
+{
+ freq_table = dev_get_platdata(&pdev->dev);
+
+ if (!freq_table) {
+ pr_err("db8500-cpufreq: Failed to fetch cpufreq table\n");
+ return -ENODEV;
+ }
+
+ return cpufreq_register_driver(&db8500_cpufreq_driver);
+}
+
+static struct platform_driver db8500_cpufreq_plat_driver = {
+ .driver = {
+ .name = "cpufreq-u8500",
+ .owner = THIS_MODULE,
+ },
+ .probe = db8500_cpufreq_probe,
+};
+
static int __init db8500_cpufreq_register(void)
{
if (!cpu_is_u8500_family())
return -ENODEV;
pr_info("cpufreq for DB8500 started\n");
- return cpufreq_register_driver(&db8500_cpufreq_driver);
+ return platform_driver_register(&db8500_cpufreq_plat_driver);
}
device_initcall(db8500_cpufreq_register);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("cpufreq driver for DB8500");
diff --git a/drivers/cpufreq/exynos-cpufreq.c b/drivers/cpufreq/exynos-cpufreq.c
index af2d81e10f7..7012ea8bf1e 100644
--- a/drivers/cpufreq/exynos-cpufreq.c
+++ b/drivers/cpufreq/exynos-cpufreq.c
@@ -31,13 +31,13 @@ static unsigned int locking_frequency;
static bool frequency_locked;
static DEFINE_MUTEX(cpufreq_lock);
-int exynos_verify_speed(struct cpufreq_policy *policy)
+static int exynos_verify_speed(struct cpufreq_policy *policy)
{
return cpufreq_frequency_table_verify(policy,
exynos_info->freq_table);
}
-unsigned int exynos_getspeed(unsigned int cpu)
+static unsigned int exynos_getspeed(unsigned int cpu)
{
return clk_get_rate(exynos_info->cpu_clk) / 1000;
}
@@ -100,7 +100,8 @@ static int exynos_target(struct cpufreq_policy *policy,
}
arm_volt = volt_table[index];
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ for_each_cpu(freqs.cpu, policy->cpus)
+ cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
/* When the new frequency is higher than current frequency */
if ((freqs.new > freqs.old) && !safe_arm_volt) {
@@ -115,7 +116,8 @@ static int exynos_target(struct cpufreq_policy *policy,
if (freqs.new != freqs.old)
exynos_info->set_freq(old_index, index);
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ for_each_cpu(freqs.cpu, policy->cpus)
+ cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
/* When the new frequency is lower than current frequency */
if ((freqs.new < freqs.old) ||
@@ -235,6 +237,7 @@ static int exynos_cpufreq_cpu_init(struct cpufreq_policy *policy)
cpumask_copy(policy->related_cpus, cpu_possible_mask);
cpumask_copy(policy->cpus, cpu_online_mask);
} else {
+ policy->shared_type = CPUFREQ_SHARED_TYPE_ANY;
cpumask_setall(policy->cpus);
}
diff --git a/drivers/cpufreq/freq_table.c b/drivers/cpufreq/freq_table.c
index 90431cb9280..49cda256efb 100644
--- a/drivers/cpufreq/freq_table.c
+++ b/drivers/cpufreq/freq_table.c
@@ -9,6 +9,8 @@
*
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
diff --git a/drivers/cpufreq/longhaul.c b/drivers/cpufreq/longhaul.c
index 53ddbc760af..1180d536d1e 100644
--- a/drivers/cpufreq/longhaul.c
+++ b/drivers/cpufreq/longhaul.c
@@ -77,7 +77,7 @@ static unsigned int longhaul_index;
static int scale_voltage;
static int disable_acpi_c3;
static int revid_errata;
-
+static int enable;
/* Clock ratios multiplied by 10 */
static int mults[32];
@@ -930,7 +930,7 @@ static int __cpuinit longhaul_cpu_init(struct cpufreq_policy *policy)
return 0;
}
-static int __devexit longhaul_cpu_exit(struct cpufreq_policy *policy)
+static int longhaul_cpu_exit(struct cpufreq_policy *policy)
{
cpufreq_frequency_table_put_attr(policy->cpu);
return 0;
@@ -946,7 +946,7 @@ static struct cpufreq_driver longhaul_driver = {
.target = longhaul_target,
.get = longhaul_get,
.init = longhaul_cpu_init,
- .exit = __devexit_p(longhaul_cpu_exit),
+ .exit = longhaul_cpu_exit,
.name = "longhaul",
.owner = THIS_MODULE,
.attr = longhaul_attr,
@@ -965,6 +965,10 @@ static int __init longhaul_init(void)
if (!x86_match_cpu(longhaul_id))
return -ENODEV;
+ if (!enable) {
+ printk(KERN_ERR PFX "Option \"enable\" not set. Aborting.\n");
+ return -ENODEV;
+ }
#ifdef CONFIG_SMP
if (num_online_cpus() > 1) {
printk(KERN_ERR PFX "More than 1 CPU detected, "
@@ -1021,6 +1025,10 @@ MODULE_PARM_DESC(scale_voltage, "Scale voltage of processor");
* such. */
module_param(revid_errata, int, 0644);
MODULE_PARM_DESC(revid_errata, "Ignore CPU Revision ID");
+/* By default driver is disabled to prevent incompatible
+ * system freeze. */
+module_param(enable, int, 0644);
+MODULE_PARM_DESC(enable, "Enable driver");
MODULE_AUTHOR("Dave Jones <davej@redhat.com>");
MODULE_DESCRIPTION("Longhaul driver for VIA Cyrix processors.");
diff --git a/drivers/cpufreq/omap-cpufreq.c b/drivers/cpufreq/omap-cpufreq.c
index 1f3417a8322..97102b05843 100644
--- a/drivers/cpufreq/omap-cpufreq.c
+++ b/drivers/cpufreq/omap-cpufreq.c
@@ -110,13 +110,16 @@ static int omap_target(struct cpufreq_policy *policy,
freq = ret;
if (mpu_reg) {
+ rcu_read_lock();
opp = opp_find_freq_ceil(mpu_dev, &freq);
if (IS_ERR(opp)) {
+ rcu_read_unlock();
dev_err(mpu_dev, "%s: unable to find MPU OPP for %d\n",
__func__, freqs.new);
return -EINVAL;
}
volt = opp_get_voltage(opp);
+ rcu_read_unlock();
tol = volt * OPP_TOLERANCE / 100;
volt_old = regulator_get_voltage(mpu_reg);
}
diff --git a/drivers/cpufreq/powernow-k8.c b/drivers/cpufreq/powernow-k8.c
index c16a3a593ba..056faf6af1a 100644
--- a/drivers/cpufreq/powernow-k8.c
+++ b/drivers/cpufreq/powernow-k8.c
@@ -5,7 +5,7 @@
* http://www.gnu.org/licenses/gpl.html
*
* Maintainer:
- * Andreas Herrmann <andreas.herrmann3@amd.com>
+ * Andreas Herrmann <herrmann.der.user@googlemail.com>
*
* Based on the powernow-k7.c module written by Dave Jones.
* (C) 2003 Dave Jones on behalf of SuSE Labs
@@ -1186,7 +1186,7 @@ err_out:
return -ENODEV;
}
-static int __devexit powernowk8_cpu_exit(struct cpufreq_policy *pol)
+static int powernowk8_cpu_exit(struct cpufreq_policy *pol)
{
struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
@@ -1242,7 +1242,7 @@ static struct cpufreq_driver cpufreq_amd64_driver = {
.target = powernowk8_target,
.bios_limit = acpi_processor_get_bios_limit,
.init = powernowk8_cpu_init,
- .exit = __devexit_p(powernowk8_cpu_exit),
+ .exit = powernowk8_cpu_exit,
.get = powernowk8_get,
.name = "powernow-k8",
.owner = THIS_MODULE,
diff --git a/drivers/cpufreq/spear-cpufreq.c b/drivers/cpufreq/spear-cpufreq.c
new file mode 100644
index 00000000000..4575cfe4175
--- /dev/null
+++ b/drivers/cpufreq/spear-cpufreq.c
@@ -0,0 +1,291 @@
+/*
+ * drivers/cpufreq/spear-cpufreq.c
+ *
+ * CPU Frequency Scaling for SPEAr platform
+ *
+ * Copyright (C) 2012 ST Microelectronics
+ * Deepak Sikri <deepak.sikri@st.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/clk.h>
+#include <linux/cpufreq.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+/* SPEAr CPUFreq driver data structure */
+static struct {
+ struct clk *clk;
+ unsigned int transition_latency;
+ struct cpufreq_frequency_table *freq_tbl;
+ u32 cnt;
+} spear_cpufreq;
+
+int spear_cpufreq_verify(struct cpufreq_policy *policy)
+{
+ return cpufreq_frequency_table_verify(policy, spear_cpufreq.freq_tbl);
+}
+
+static unsigned int spear_cpufreq_get(unsigned int cpu)
+{
+ return clk_get_rate(spear_cpufreq.clk) / 1000;
+}
+
+static struct clk *spear1340_cpu_get_possible_parent(unsigned long newfreq)
+{
+ struct clk *sys_pclk;
+ int pclk;
+ /*
+ * In SPEAr1340, cpu clk's parent sys clk can take input from
+ * following sources
+ */
+ const char *sys_clk_src[] = {
+ "sys_syn_clk",
+ "pll1_clk",
+ "pll2_clk",
+ "pll3_clk",
+ };
+
+ /*
+ * As sys clk can have multiple source with their own range
+ * limitation so we choose possible sources accordingly
+ */
+ if (newfreq <= 300000000)
+ pclk = 0; /* src is sys_syn_clk */
+ else if (newfreq > 300000000 && newfreq <= 500000000)
+ pclk = 3; /* src is pll3_clk */
+ else if (newfreq == 600000000)
+ pclk = 1; /* src is pll1_clk */
+ else
+ return ERR_PTR(-EINVAL);
+
+ /* Get parent to sys clock */
+ sys_pclk = clk_get(NULL, sys_clk_src[pclk]);
+ if (IS_ERR(sys_pclk))
+ pr_err("Failed to get %s clock\n", sys_clk_src[pclk]);
+
+ return sys_pclk;
+}
+
+/*
+ * In SPEAr1340, we cannot use newfreq directly because we need to actually
+ * access a source clock (clk) which might not be ancestor of cpu at present.
+ * Hence in SPEAr1340 we would operate on source clock directly before switching
+ * cpu clock to it.
+ */
+static int spear1340_set_cpu_rate(struct clk *sys_pclk, unsigned long newfreq)
+{
+ struct clk *sys_clk;
+ int ret = 0;
+
+ sys_clk = clk_get_parent(spear_cpufreq.clk);
+ if (IS_ERR(sys_clk)) {
+ pr_err("failed to get cpu's parent (sys) clock\n");
+ return PTR_ERR(sys_clk);
+ }
+
+ /* Set the rate of the source clock before changing the parent */
+ ret = clk_set_rate(sys_pclk, newfreq);
+ if (ret) {
+ pr_err("Failed to set sys clk rate to %lu\n", newfreq);
+ return ret;
+ }
+
+ ret = clk_set_parent(sys_clk, sys_pclk);
+ if (ret) {
+ pr_err("Failed to set sys clk parent\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int spear_cpufreq_target(struct cpufreq_policy *policy,
+ unsigned int target_freq, unsigned int relation)
+{
+ struct cpufreq_freqs freqs;
+ unsigned long newfreq;
+ struct clk *srcclk;
+ int index, ret, mult = 1;
+
+ if (cpufreq_frequency_table_target(policy, spear_cpufreq.freq_tbl,
+ target_freq, relation, &index))
+ return -EINVAL;
+
+ freqs.cpu = policy->cpu;
+ freqs.old = spear_cpufreq_get(0);
+
+ newfreq = spear_cpufreq.freq_tbl[index].frequency * 1000;
+ if (of_machine_is_compatible("st,spear1340")) {
+ /*
+ * SPEAr1340 is special in the sense that due to the possibility
+ * of multiple clock sources for cpu clk's parent we can have
+ * different clock source for different frequency of cpu clk.
+ * Hence we need to choose one from amongst these possible clock
+ * sources.
+ */
+ srcclk = spear1340_cpu_get_possible_parent(newfreq);
+ if (IS_ERR(srcclk)) {
+ pr_err("Failed to get src clk\n");
+ return PTR_ERR(srcclk);
+ }
+
+ /* SPEAr1340: src clk is always 2 * intended cpu clk */
+ mult = 2;
+ } else {
+ /*
+ * src clock to be altered is ancestor of cpu clock. Hence we
+ * can directly work on cpu clk
+ */
+ srcclk = spear_cpufreq.clk;
+ }
+
+ newfreq = clk_round_rate(srcclk, newfreq * mult);
+ if (newfreq < 0) {
+ pr_err("clk_round_rate failed for cpu src clock\n");
+ return newfreq;
+ }
+
+ freqs.new = newfreq / 1000;
+ freqs.new /= mult;
+ cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+
+ if (mult == 2)
+ ret = spear1340_set_cpu_rate(srcclk, newfreq);
+ else
+ ret = clk_set_rate(spear_cpufreq.clk, newfreq);
+
+ /* Get current rate after clk_set_rate, in case of failure */
+ if (ret) {
+ pr_err("CPU Freq: cpu clk_set_rate failed: %d\n", ret);
+ freqs.new = clk_get_rate(spear_cpufreq.clk) / 1000;
+ }
+
+ cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ return ret;
+}
+
+static int spear_cpufreq_init(struct cpufreq_policy *policy)
+{
+ int ret;
+
+ ret = cpufreq_frequency_table_cpuinfo(policy, spear_cpufreq.freq_tbl);
+ if (ret) {
+ pr_err("cpufreq_frequency_table_cpuinfo() failed");
+ return ret;
+ }
+
+ cpufreq_frequency_table_get_attr(spear_cpufreq.freq_tbl, policy->cpu);
+ policy->cpuinfo.transition_latency = spear_cpufreq.transition_latency;
+ policy->cur = spear_cpufreq_get(0);
+
+ cpumask_copy(policy->cpus, topology_core_cpumask(policy->cpu));
+ cpumask_copy(policy->related_cpus, policy->cpus);
+
+ return 0;
+}
+
+static int spear_cpufreq_exit(struct cpufreq_policy *policy)
+{
+ cpufreq_frequency_table_put_attr(policy->cpu);
+ return 0;
+}
+
+static struct freq_attr *spear_cpufreq_attr[] = {
+ &cpufreq_freq_attr_scaling_available_freqs,
+ NULL,
+};
+
+static struct cpufreq_driver spear_cpufreq_driver = {
+ .name = "cpufreq-spear",
+ .flags = CPUFREQ_STICKY,
+ .verify = spear_cpufreq_verify,
+ .target = spear_cpufreq_target,
+ .get = spear_cpufreq_get,
+ .init = spear_cpufreq_init,
+ .exit = spear_cpufreq_exit,
+ .attr = spear_cpufreq_attr,
+};
+
+static int spear_cpufreq_driver_init(void)
+{
+ struct device_node *np;
+ const struct property *prop;
+ struct cpufreq_frequency_table *freq_tbl;
+ const __be32 *val;
+ int cnt, i, ret;
+
+ np = of_find_node_by_path("/cpus/cpu@0");
+ if (!np) {
+ pr_err("No cpu node found");
+ return -ENODEV;
+ }
+
+ if (of_property_read_u32(np, "clock-latency",
+ &spear_cpufreq.transition_latency))
+ spear_cpufreq.transition_latency = CPUFREQ_ETERNAL;
+
+ prop = of_find_property(np, "cpufreq_tbl", NULL);
+ if (!prop || !prop->value) {
+ pr_err("Invalid cpufreq_tbl");
+ ret = -ENODEV;
+ goto out_put_node;
+ }
+
+ cnt = prop->length / sizeof(u32);
+ val = prop->value;
+
+ freq_tbl = kmalloc(sizeof(*freq_tbl) * (cnt + 1), GFP_KERNEL);
+ if (!freq_tbl) {
+ ret = -ENOMEM;
+ goto out_put_node;
+ }
+
+ for (i = 0; i < cnt; i++) {
+ freq_tbl[i].index = i;
+ freq_tbl[i].frequency = be32_to_cpup(val++);
+ }
+
+ freq_tbl[i].index = i;
+ freq_tbl[i].frequency = CPUFREQ_TABLE_END;
+
+ spear_cpufreq.freq_tbl = freq_tbl;
+
+ of_node_put(np);
+
+ spear_cpufreq.clk = clk_get(NULL, "cpu_clk");
+ if (IS_ERR(spear_cpufreq.clk)) {
+ pr_err("Unable to get CPU clock\n");
+ ret = PTR_ERR(spear_cpufreq.clk);
+ goto out_put_mem;
+ }
+
+ ret = cpufreq_register_driver(&spear_cpufreq_driver);
+ if (!ret)
+ return 0;
+
+ pr_err("failed register driver: %d\n", ret);
+ clk_put(spear_cpufreq.clk);
+
+out_put_mem:
+ kfree(freq_tbl);
+ return ret;
+
+out_put_node:
+ of_node_put(np);
+ return ret;
+}
+late_initcall(spear_cpufreq_driver_init);
+
+MODULE_AUTHOR("Deepak Sikri <deepak.sikri@st.com>");
+MODULE_DESCRIPTION("SPEAr CPUFreq driver");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-15 22:55:33 +0000