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path: root/drivers/cpufreq/intel_pstate.c
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Diffstat (limited to 'drivers/cpufreq/intel_pstate.c')
-rw-r--r--drivers/cpufreq/intel_pstate.c120
1 files changed, 116 insertions, 4 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 886324041add..9f02de9a1b47 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -24,6 +24,7 @@
#include <linux/fs.h>
#include <linux/acpi.h>
#include <linux/vmalloc.h>
+#include <linux/pm_qos.h>
#include <trace/events/power.h>
#include <asm/div64.h>
@@ -1085,6 +1086,47 @@ static ssize_t store_no_turbo(struct kobject *a, struct kobj_attribute *b,
return count;
}
+static struct cpufreq_driver intel_pstate;
+
+static void update_qos_request(enum dev_pm_qos_req_type type)
+{
+ int max_state, turbo_max, freq, i, perf_pct;
+ struct dev_pm_qos_request *req;
+ struct cpufreq_policy *policy;
+
+ for_each_possible_cpu(i) {
+ struct cpudata *cpu = all_cpu_data[i];
+
+ policy = cpufreq_cpu_get(i);
+ if (!policy)
+ continue;
+
+ req = policy->driver_data;
+ cpufreq_cpu_put(policy);
+
+ if (!req)
+ continue;
+
+ if (hwp_active)
+ intel_pstate_get_hwp_max(i, &turbo_max, &max_state);
+ else
+ turbo_max = cpu->pstate.turbo_pstate;
+
+ if (type == DEV_PM_QOS_MIN_FREQUENCY) {
+ perf_pct = global.min_perf_pct;
+ } else {
+ req++;
+ perf_pct = global.max_perf_pct;
+ }
+
+ freq = DIV_ROUND_UP(turbo_max * perf_pct, 100);
+ freq *= cpu->pstate.scaling;
+
+ if (dev_pm_qos_update_request(req, freq) < 0)
+ pr_warn("Failed to update freq constraint: CPU%d\n", i);
+ }
+}
+
static ssize_t store_max_perf_pct(struct kobject *a, struct kobj_attribute *b,
const char *buf, size_t count)
{
@@ -1108,7 +1150,10 @@ static ssize_t store_max_perf_pct(struct kobject *a, struct kobj_attribute *b,
mutex_unlock(&intel_pstate_limits_lock);
- intel_pstate_update_policies();
+ if (intel_pstate_driver == &intel_pstate)
+ intel_pstate_update_policies();
+ else
+ update_qos_request(DEV_PM_QOS_MAX_FREQUENCY);
mutex_unlock(&intel_pstate_driver_lock);
@@ -1139,7 +1184,10 @@ static ssize_t store_min_perf_pct(struct kobject *a, struct kobj_attribute *b,
mutex_unlock(&intel_pstate_limits_lock);
- intel_pstate_update_policies();
+ if (intel_pstate_driver == &intel_pstate)
+ intel_pstate_update_policies();
+ else
+ update_qos_request(DEV_PM_QOS_MIN_FREQUENCY);
mutex_unlock(&intel_pstate_driver_lock);
@@ -2332,8 +2380,16 @@ static unsigned int intel_cpufreq_fast_switch(struct cpufreq_policy *policy,
static int intel_cpufreq_cpu_init(struct cpufreq_policy *policy)
{
- int ret = __intel_pstate_cpu_init(policy);
+ int max_state, turbo_max, min_freq, max_freq, ret;
+ struct dev_pm_qos_request *req;
+ struct cpudata *cpu;
+ struct device *dev;
+
+ dev = get_cpu_device(policy->cpu);
+ if (!dev)
+ return -ENODEV;
+ ret = __intel_pstate_cpu_init(policy);
if (ret)
return ret;
@@ -2342,7 +2398,63 @@ static int intel_cpufreq_cpu_init(struct cpufreq_policy *policy)
/* This reflects the intel_pstate_get_cpu_pstates() setting. */
policy->cur = policy->cpuinfo.min_freq;
+ req = kcalloc(2, sizeof(*req), GFP_KERNEL);
+ if (!req) {
+ ret = -ENOMEM;
+ goto pstate_exit;
+ }
+
+ cpu = all_cpu_data[policy->cpu];
+
+ if (hwp_active)
+ intel_pstate_get_hwp_max(policy->cpu, &turbo_max, &max_state);
+ else
+ turbo_max = cpu->pstate.turbo_pstate;
+
+ min_freq = DIV_ROUND_UP(turbo_max * global.min_perf_pct, 100);
+ min_freq *= cpu->pstate.scaling;
+ max_freq = DIV_ROUND_UP(turbo_max * global.max_perf_pct, 100);
+ max_freq *= cpu->pstate.scaling;
+
+ ret = dev_pm_qos_add_request(dev, req, DEV_PM_QOS_MIN_FREQUENCY,
+ min_freq);
+ if (ret < 0) {
+ dev_err(dev, "Failed to add min-freq constraint (%d)\n", ret);
+ goto free_req;
+ }
+
+ ret = dev_pm_qos_add_request(dev, req + 1, DEV_PM_QOS_MAX_FREQUENCY,
+ max_freq);
+ if (ret < 0) {
+ dev_err(dev, "Failed to add max-freq constraint (%d)\n", ret);
+ goto remove_min_req;
+ }
+
+ policy->driver_data = req;
+
return 0;
+
+remove_min_req:
+ dev_pm_qos_remove_request(req);
+free_req:
+ kfree(req);
+pstate_exit:
+ intel_pstate_exit_perf_limits(policy);
+
+ return ret;
+}
+
+static int intel_cpufreq_cpu_exit(struct cpufreq_policy *policy)
+{
+ struct dev_pm_qos_request *req;
+
+ req = policy->driver_data;
+
+ dev_pm_qos_remove_request(req + 1);
+ dev_pm_qos_remove_request(req);
+ kfree(req);
+
+ return intel_pstate_cpu_exit(policy);
}
static struct cpufreq_driver intel_cpufreq = {
@@ -2351,7 +2463,7 @@ static struct cpufreq_driver intel_cpufreq = {
.target = intel_cpufreq_target,
.fast_switch = intel_cpufreq_fast_switch,
.init = intel_cpufreq_cpu_init,
- .exit = intel_pstate_cpu_exit,
+ .exit = intel_cpufreq_cpu_exit,
.stop_cpu = intel_cpufreq_stop_cpu,
.update_limits = intel_pstate_update_limits,
.name = "intel_cpufreq",