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rte_power_cpufreq.h(3) Library Functions Manual rte_power_cpufreq.h(3)

NAME

rte_power_cpufreq.h

SYNOPSIS

#include <rte_common.h>
#include <rte_log.h>
#include 'power_cpufreq.h'

Functions


int rte_power_check_env_supported (enum power_management_env env)
int rte_power_set_env (enum power_management_env env)
void rte_power_unset_env (void)
enum power_management_env rte_power_get_env (void)
int rte_power_init (unsigned int lcore_id)
int rte_power_exit (unsigned int lcore_id)
uint32_t rte_power_freqs (unsigned int lcore_id, uint32_t *freqs, uint32_t num)
uint32_t rte_power_get_freq (unsigned int lcore_id)
uint32_t rte_power_set_freq (unsigned int lcore_id, uint32_t index)
int rte_power_freq_up (unsigned int lcore_id)
int rte_power_freq_down (unsigned int lcore_id)
int rte_power_freq_max (unsigned int lcore_id)
int rte_power_freq_min (unsigned int lcore_id)
int rte_power_turbo_status (unsigned int lcore_id)
int rte_power_freq_enable_turbo (unsigned int lcore_id)
int rte_power_freq_disable_turbo (unsigned int lcore_id)
int rte_power_get_capabilities (unsigned int lcore_id, struct rte_power_core_capabilities *caps)

Detailed Description

CPU Frequency Management

Definition in file rte_power_cpufreq.h.

Function Documentation

int rte_power_check_env_supported (enum power_management_env env)

Check if a specific power management environment type is supported on a currently running system.

Parameters

env The environment type to check support for.

Returns

  • 1 if supported
  • 0 if unsupported
  • -1 if error, with rte_errno indicating reason for error.

int rte_power_set_env (enum power_management_env env)

Set the default power management implementation. If this is not called prior to rte_power_init(), then auto-detect of the environment will take place. It is thread safe. New env can be set only in uninitialized state (thus rte_power_unset_env must be called if different env was already set).

Parameters

env env. The environment in which to initialise Power Management for.

Returns

  • 0 on success.
  • Negative on error.

void rte_power_unset_env (void)

Unset the global environment configuration. This can only be called after all threads have completed.

enum power_management_env rte_power_get_env (void)

Get the default power management implementation.

Returns

power_management_env The configured environment.

int rte_power_init (unsigned int lcore_id)

Initialize power management for a specific lcore. If rte_power_set_env() has not been called then an auto-detect of the environment will start and initialise the corresponding resources.

Parameters

lcore_id lcore id.

Returns

  • 0 on success.
  • Negative on error.

int rte_power_exit (unsigned int lcore_id)

Exit power management on a specific lcore. This will call the environment dependent exit function.

Parameters

lcore_id lcore id.

Returns

  • 0 on success.
  • Negative on error.

uint32_t rte_power_freqs (unsigned int lcore_id, uint32_t * freqs, uint32_t num)

Get the available frequencies of a specific lcore. Function pointer definition. Review each environments specific documentation for usage.

Parameters

lcore_id lcore id.
freqs The buffer array to save the frequencies.
num The number of frequencies to get.

Returns

The number of available frequencies.

uint32_t rte_power_get_freq (unsigned int lcore_id)

Return the current index of available frequencies of a specific lcore. Function pointer definition. Review each environments specific documentation for usage.

Parameters

lcore_id lcore id.

Returns

The current index of available frequencies.

uint32_t rte_power_set_freq (unsigned int lcore_id, uint32_t index)

Set the new frequency for a specific lcore by indicating the index of available frequencies. Function pointer definition. Review each environments specific documentation for usage.

Parameters

lcore_id lcore id.
index The index of available frequencies.

Returns

  • 1 on success with frequency changed.
  • 0 on success without frequency changed.
  • Negative on error.

int rte_power_freq_up (unsigned int lcore_id)

Scale up the frequency of a specific lcore according to the available frequencies. Review each environments specific documentation for usage.

Parameters

lcore_id lcore id.

Returns

  • 1 on success with frequency changed.
  • 0 on success without frequency changed.
  • Negative on error.

int rte_power_freq_down (unsigned int lcore_id)

Scale down the frequency of a specific lcore according to the available frequencies. Review each environments specific documentation for usage.

Parameters

lcore_id lcore id.

Returns

  • 1 on success with frequency changed.
  • 0 on success without frequency changed.
  • Negative on error.

int rte_power_freq_max (unsigned int lcore_id)

Scale up the frequency of a specific lcore to the highest according to the available frequencies. Review each environments specific documentation for usage.

Parameters

lcore_id lcore id.

Returns

  • 1 on success with frequency changed.
  • 0 on success without frequency changed.
  • Negative on error.

int rte_power_freq_min (unsigned int lcore_id)

Scale down the frequency of a specific lcore to the lowest according to the available frequencies. Review each environments specific documentation for usage..

Parameters

lcore_id lcore id.

Returns

  • 1 on success with frequency changed.
  • 0 on success without frequency changed.
  • Negative on error.

int rte_power_turbo_status (unsigned int lcore_id)

Query the Turbo Boost status of a specific lcore. Review each environments specific documentation for usage..

Parameters

lcore_id lcore id.

Returns

  • 1 turbo boost enabled.
  • 0 turbo boost disabled.
  • Negative on error.

int rte_power_freq_enable_turbo (unsigned int lcore_id)

Enable Turbo Boost for this lcore. Review each environments specific documentation for usage..

Parameters

lcore_id lcore id.

Returns

  • 0 on success.
  • Negative on error.

int rte_power_freq_disable_turbo (unsigned int lcore_id)

Disable Turbo Boost for this lcore. Review each environments specific documentation for usage..

Parameters

lcore_id lcore id.

Returns

  • 0 on success.
  • Negative on error.

int rte_power_get_capabilities (unsigned int lcore_id, struct rte_power_core_capabilities * caps)

Returns power capabilities for a specific lcore. Function pointer definition. Review each environments specific documentation for usage.

Parameters

lcore_id lcore id.
caps pointer to rte_power_core_capabilities object.

Returns

  • 0 on success.
  • Negative on error.

Author

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