@@ -321,7 +321,9 @@ Whether this behavior is enabled by default with the kernel config option
at runtime by the sysfs file ``/sys/devices/system/cpu/cpufreq/policyX/dynamic_epp``.
When set to enabled, the driver will select a different energy performance
-profile when the machine is running on battery or AC power.
+profile when the machine is running on battery or AC power. The driver will
+also register with the platform profile handler to receive notifications of
+user desired power state and react to those.
When set to disabled, the driver will not change the energy performance profile
based on the power source and will not react to user desired power state.
@@ -40,6 +40,7 @@ config X86_AMD_PSTATE
select ACPI_PROCESSOR
select ACPI_CPPC_LIB if X86_64
select CPU_FREQ_GOV_SCHEDUTIL if SMP
+ select ACPI_PLATFORM_PROFILE
help
This driver adds a CPUFreq driver which utilizes a fine grain
processor performance frequency control range instead of legacy
@@ -105,6 +105,7 @@ static struct quirk_entry *quirks;
* 2 balance_performance
* 3 balance_power
* 4 power
+ * 5 custom (for raw EPP values)
*/
enum energy_perf_value_index {
EPP_INDEX_DEFAULT = 0,
@@ -112,6 +113,7 @@ enum energy_perf_value_index {
EPP_INDEX_BALANCE_PERFORMANCE,
EPP_INDEX_BALANCE_POWERSAVE,
EPP_INDEX_POWERSAVE,
+ EPP_INDEX_CUSTOM,
};
static const char * const energy_perf_strings[] = {
@@ -120,6 +122,7 @@ static const char * const energy_perf_strings[] = {
[EPP_INDEX_BALANCE_PERFORMANCE] = "balance_performance",
[EPP_INDEX_BALANCE_POWERSAVE] = "balance_power",
[EPP_INDEX_POWERSAVE] = "power",
+ [EPP_INDEX_CUSTOM] = "custom",
NULL
};
@@ -1089,6 +1092,10 @@ static int amd_pstate_power_supply_notifier(struct notifier_block *nb,
if (event != PSY_EVENT_PROP_CHANGED)
return NOTIFY_OK;
+ /* dynamic actions are only applied while platform profile is in balanced */
+ if (cpudata->current_profile != PLATFORM_PROFILE_BALANCED)
+ return 0;
+
epp = amd_pstate_get_balanced_epp(policy);
ret = amd_pstate_set_epp(policy, epp);
@@ -1097,14 +1104,84 @@ static int amd_pstate_power_supply_notifier(struct notifier_block *nb,
return NOTIFY_OK;
}
-static void amd_pstate_clear_dynamic_epp(struct cpufreq_policy *policy)
+
+static int amd_pstate_profile_probe(void *drvdata, unsigned long *choices)
+{
+ set_bit(PLATFORM_PROFILE_LOW_POWER, choices);
+ set_bit(PLATFORM_PROFILE_BALANCED, choices);
+ set_bit(PLATFORM_PROFILE_PERFORMANCE, choices);
+
+ return 0;
+}
+
+static int amd_pstate_profile_get(struct device *dev,
+ enum platform_profile_option *profile)
+{
+ struct amd_cpudata *cpudata = dev_get_drvdata(dev);
+
+ *profile = cpudata->current_profile;
+
+ return 0;
+}
+
+static int amd_pstate_profile_set(struct device *dev,
+ enum platform_profile_option profile)
+{
+ struct amd_cpudata *cpudata = dev_get_drvdata(dev);
+ struct cpufreq_policy *policy __free(put_cpufreq_policy) = cpufreq_cpu_get(cpudata->cpu);
+ int ret;
+
+ switch (profile) {
+ case PLATFORM_PROFILE_LOW_POWER:
+ if (cpudata->policy != CPUFREQ_POLICY_POWERSAVE)
+ cpudata->policy = CPUFREQ_POLICY_POWERSAVE;
+ ret = amd_pstate_set_epp(policy, AMD_CPPC_EPP_POWERSAVE);
+ if (ret)
+ return ret;
+ break;
+ case PLATFORM_PROFILE_BALANCED:
+ if (cpudata->policy != CPUFREQ_POLICY_POWERSAVE)
+ cpudata->policy = CPUFREQ_POLICY_POWERSAVE;
+ ret = amd_pstate_set_epp(policy,
+ amd_pstate_get_balanced_epp(policy));
+ if (ret)
+ return ret;
+ break;
+ case PLATFORM_PROFILE_PERFORMANCE:
+ ret = amd_pstate_set_epp(policy, AMD_CPPC_EPP_PERFORMANCE);
+ if (ret)
+ return ret;
+ break;
+ default:
+ pr_err("Unknown Platform Profile %d\n", profile);
+ return -EOPNOTSUPP;
+ }
+
+ cpudata->current_profile = profile;
+
+ return 0;
+}
+
+static const struct platform_profile_ops amd_pstate_profile_ops = {
+ .probe = amd_pstate_profile_probe,
+ .profile_set = amd_pstate_profile_set,
+ .profile_get = amd_pstate_profile_get,
+};
+
+void amd_pstate_clear_dynamic_epp(struct cpufreq_policy *policy)
{
struct amd_cpudata *cpudata = policy->driver_data;
if (cpudata->power_nb.notifier_call)
power_supply_unreg_notifier(&cpudata->power_nb);
+ if (cpudata->ppdev) {
+ platform_profile_remove(cpudata->ppdev);
+ cpudata->ppdev = NULL;
+ }
+ kfree(cpudata->profile_name);
cpudata->dynamic_epp = false;
}
+EXPORT_SYMBOL_GPL(amd_pstate_clear_dynamic_epp);
static int amd_pstate_set_dynamic_epp(struct cpufreq_policy *policy)
{
@@ -1112,11 +1189,35 @@ static int amd_pstate_set_dynamic_epp(struct cpufreq_policy *policy)
int ret;
u8 epp;
- epp = amd_pstate_get_balanced_epp(policy);
+ switch (cpudata->current_profile) {
+ case PLATFORM_PROFILE_PERFORMANCE:
+ epp = AMD_CPPC_EPP_PERFORMANCE;
+ break;
+ case PLATFORM_PROFILE_LOW_POWER:
+ epp = AMD_CPPC_EPP_POWERSAVE;
+ break;
+ case PLATFORM_PROFILE_BALANCED:
+ epp = amd_pstate_get_balanced_epp(policy);
+ break;
+ default:
+ pr_err("Unknown Platform Profile %d\n", cpudata->current_profile);
+ return -EOPNOTSUPP;
+ }
ret = amd_pstate_set_epp(policy, epp);
if (ret)
return ret;
+ cpudata->profile_name = kasprintf(GFP_KERNEL, "amd-pstate-epp-cpu%d", cpudata->cpu);
+
+ cpudata->ppdev = platform_profile_register(get_cpu_device(policy->cpu),
+ cpudata->profile_name,
+ policy->driver_data,
+ &amd_pstate_profile_ops);
+ if (IS_ERR(cpudata->ppdev)) {
+ ret = PTR_ERR(cpudata->ppdev);
+ goto cleanup;
+ }
+
/* only enable notifier if things will actually change */
if (cpudata->epp_default_ac != cpudata->epp_default_dc) {
ret = power_supply_reg_notifier(&cpudata->power_nb);
@@ -1223,8 +1324,8 @@ static ssize_t show_energy_performance_available_preferences(
return offset;
}
-static ssize_t store_energy_performance_preference(
- struct cpufreq_policy *policy, const char *buf, size_t count)
+ssize_t store_energy_performance_preference(struct cpufreq_policy *policy,
+ const char *buf, size_t count)
{
struct amd_cpudata *cpudata = policy->driver_data;
char str_preference[21];
@@ -1240,41 +1341,35 @@ static ssize_t store_energy_performance_preference(
if (ret != 1)
return -EINVAL;
- ret = match_string(energy_perf_strings, -1, str_preference);
- if (ret < 0)
- return -EINVAL;
-
- if (ret)
- epp = epp_values[ret];
- else
- epp = amd_pstate_get_balanced_epp(policy);
+ /*
+ * if the value matches a number, use that, otherwise see if
+ * matches an index in the energy_perf_strings array
+ */
+ ret = kstrtou8(str_preference, 0, &epp);
+ if (ret) {
+ ret = match_string(energy_perf_strings, -1, str_preference);
+ if (ret < 0 || ret == EPP_INDEX_CUSTOM)
+ return -EINVAL;
+ if (ret)
+ epp = epp_values[ret];
+ else
+ epp = amd_pstate_get_balanced_epp(policy);
+ }
- if (epp > 0 && policy->policy == CPUFREQ_POLICY_PERFORMANCE) {
+ if (epp > 0 && cpudata->policy == CPUFREQ_POLICY_PERFORMANCE) {
pr_debug("EPP cannot be set under performance policy\n");
return -EBUSY;
}
- if (trace_amd_pstate_epp_perf_enabled()) {
- union perf_cached perf = cpudata->perf;
-
- trace_amd_pstate_epp_perf(cpudata->cpu, perf.highest_perf,
- epp,
- FIELD_GET(AMD_CPPC_MIN_PERF_MASK, cpudata->cppc_req_cached),
- FIELD_GET(AMD_CPPC_MAX_PERF_MASK, cpudata->cppc_req_cached),
- policy->boost_enabled,
- FIELD_GET(AMD_CPPC_EPP_PERF_MASK,
- cpudata->cppc_req_cached) != epp);
- }
-
ret = amd_pstate_set_epp(policy, epp);
if (ret)
return ret;
return ret ? ret : count;
}
+EXPORT_SYMBOL_GPL(store_energy_performance_preference);
-static ssize_t show_energy_performance_preference(
- struct cpufreq_policy *policy, char *buf)
+ssize_t show_energy_performance_preference(struct cpufreq_policy *policy, char *buf)
{
struct amd_cpudata *cpudata = policy->driver_data;
u8 preference, epp;
@@ -1295,11 +1390,12 @@ static ssize_t show_energy_performance_preference(
preference = EPP_INDEX_POWERSAVE;
break;
default:
- return -EINVAL;
+ return sysfs_emit(buf, "%u\n", epp);
}
return sysfs_emit(buf, "%s\n", energy_perf_strings[preference]);
}
+EXPORT_SYMBOL_GPL(show_energy_performance_preference);
static void amd_pstate_driver_cleanup(void)
{
@@ -1623,10 +1719,12 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy)
amd_pstate_acpi_pm_profile_undefined()) {
policy->policy = CPUFREQ_POLICY_PERFORMANCE;
cpudata->epp_default_ac = cpudata->epp_default_dc = amd_pstate_get_epp(cpudata);
+ cpudata->current_profile = PLATFORM_PROFILE_PERFORMANCE;
} else {
policy->policy = CPUFREQ_POLICY_POWERSAVE;
cpudata->epp_default_ac = AMD_CPPC_EPP_PERFORMANCE;
cpudata->epp_default_dc = AMD_CPPC_EPP_BALANCE_PERFORMANCE;
+ cpudata->current_profile = PLATFORM_PROFILE_BALANCED;
}
if (cpu_feature_enabled(X86_FEATURE_CPPC)) {
@@ -9,6 +9,7 @@
#define _LINUX_AMD_PSTATE_H
#include <linux/pm_qos.h>
+#include <linux/platform_profile.h>
/*********************************************************************
* AMD P-state INTERFACE *
@@ -106,6 +107,11 @@ struct amd_cpudata {
u8 epp_default_dc;
bool dynamic_epp;
struct notifier_block power_nb;
+
+ /* platform profile */
+ enum platform_profile_option current_profile;
+ struct device *ppdev;
+ char *profile_name;
};
/*
@@ -121,5 +127,9 @@ enum amd_pstate_mode {
};
const char *amd_pstate_get_mode_string(enum amd_pstate_mode mode);
int amd_pstate_update_status(const char *buf, size_t size);
+ssize_t store_energy_performance_preference(struct cpufreq_policy *policy,
+ const char *buf, size_t count);
+ssize_t show_energy_performance_preference(struct cpufreq_policy *policy, char *buf);
+void amd_pstate_clear_dynamic_epp(struct cpufreq_policy *policy);
#endif /* _LINUX_AMD_PSTATE_H */