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authorJacob Shin <jacob.shin@amd.com>2013-04-02 18:56:56 +0400
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-04-10 15:19:26 +0400
commitfb30809efa3edeb692a6b29125a07c9eceb322dc (patch)
tree2664f62ce2ca5f280defc9c3b96009007118c48f /drivers/cpufreq/cpufreq_ondemand.c
parent5800043b2488a1c4c6e859af860644d37419d58b (diff)
downloadlinux-fb30809efa3edeb692a6b29125a07c9eceb322dc.tar.xz
cpufreq: ondemand: allow custom powersave_bias_target handler to be registered
This allows for another [arch specific] driver to hook into existing powersave bias function of the ondemand governor. i.e. This allows AMD specific powersave bias function (in a separate AMD specific driver) to aid ondemand governor's frequency transition decisions. Signed-off-by: Jacob Shin <jacob.shin@amd.com> Acked-by: Thomas Renninger <trenn@suse.de> Acked-by: Borislav Petkov <bp@suse.de> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq/cpufreq_ondemand.c')
-rw-r--r--drivers/cpufreq/cpufreq_ondemand.c61
1 files changed, 53 insertions, 8 deletions
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index 14714787b724..b0ffef96bf77 100644
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -24,6 +24,7 @@
#include <linux/sysfs.h>
#include <linux/tick.h>
#include <linux/types.h>
+#include <linux/cpu.h>
#include "cpufreq_governor.h"
@@ -40,6 +41,8 @@
static DEFINE_PER_CPU(struct od_cpu_dbs_info_s, od_cpu_dbs_info);
+static struct od_ops od_ops;
+
#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND
static struct cpufreq_governor cpufreq_gov_ondemand;
#endif
@@ -80,7 +83,7 @@ static int should_io_be_busy(void)
* Returns the freq_hi to be used right now and will set freq_hi_jiffies,
* freq_lo, and freq_lo_jiffies in percpu area for averaging freqs.
*/
-static unsigned int powersave_bias_target(struct cpufreq_policy *policy,
+static unsigned int generic_powersave_bias_target(struct cpufreq_policy *policy,
unsigned int freq_next, unsigned int relation)
{
unsigned int freq_req, freq_reduc, freq_avg;
@@ -145,7 +148,8 @@ static void dbs_freq_increase(struct cpufreq_policy *p, unsigned int freq)
struct od_dbs_tuners *od_tuners = dbs_data->tuners;
if (od_tuners->powersave_bias)
- freq = powersave_bias_target(p, freq, CPUFREQ_RELATION_H);
+ freq = od_ops.powersave_bias_target(p, freq,
+ CPUFREQ_RELATION_H);
else if (p->cur == p->max)
return;
@@ -205,12 +209,12 @@ static void od_check_cpu(int cpu, unsigned int load_freq)
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);
+ return;
}
+
+ freq_next = od_ops.powersave_bias_target(policy, freq_next,
+ CPUFREQ_RELATION_L);
+ __cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_L);
}
}
@@ -557,7 +561,7 @@ define_get_cpu_dbs_routines(od_cpu_dbs_info);
static struct od_ops od_ops = {
.powersave_bias_init_cpu = ondemand_powersave_bias_init_cpu,
- .powersave_bias_target = powersave_bias_target,
+ .powersave_bias_target = generic_powersave_bias_target,
.freq_increase = dbs_freq_increase,
};
@@ -574,6 +578,47 @@ static struct common_dbs_data od_dbs_cdata = {
.exit = od_exit,
};
+static void od_set_powersave_bias(unsigned int powersave_bias)
+{
+ struct cpufreq_policy *policy;
+ struct dbs_data *dbs_data;
+ struct od_dbs_tuners *od_tuners;
+ unsigned int cpu;
+ cpumask_t done;
+
+ cpumask_clear(&done);
+
+ get_online_cpus();
+ for_each_online_cpu(cpu) {
+ if (cpumask_test_cpu(cpu, &done))
+ continue;
+
+ policy = per_cpu(od_cpu_dbs_info, cpu).cdbs.cur_policy;
+ dbs_data = policy->governor_data;
+ od_tuners = dbs_data->tuners;
+ od_tuners->powersave_bias = powersave_bias;
+
+ cpumask_or(&done, &done, policy->cpus);
+ }
+ put_online_cpus();
+}
+
+void od_register_powersave_bias_handler(unsigned int (*f)
+ (struct cpufreq_policy *, unsigned int, unsigned int),
+ unsigned int powersave_bias)
+{
+ od_ops.powersave_bias_target = f;
+ od_set_powersave_bias(powersave_bias);
+}
+EXPORT_SYMBOL_GPL(od_register_powersave_bias_handler);
+
+void od_unregister_powersave_bias_handler(void)
+{
+ od_ops.powersave_bias_target = generic_powersave_bias_target;
+ od_set_powersave_bias(0);
+}
+EXPORT_SYMBOL_GPL(od_unregister_powersave_bias_handler);
+
static int od_cpufreq_governor_dbs(struct cpufreq_policy *policy,
unsigned int event)
{