194 lines
5.4 KiB
C
194 lines
5.4 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright(c) 2010-2013 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _RTE_POWER_H
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#define _RTE_POWER_H
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/**
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* @file
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* RTE Power Management
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*/
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#include <rte_common.h>
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#include <rte_byteorder.h>
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#include <rte_log.h>
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#include <rte_string_fns.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define RTE_POWER_INVALID_FREQ_INDEX (~0)
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/**
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* Initialize power management for a specific lcore. It will check and set the
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* governor to userspace for the lcore, get the available frequencies, and
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* prepare to set new lcore frequency.
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*
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* @param lcore_id
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* lcore id.
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*
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* @return
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* - 0 on success.
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* - Negative on error.
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*/
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int rte_power_init(unsigned lcore_id);
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/**
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* Exit power management on a specific lcore. It will set the governor to which
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* is before initialized.
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*
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* @param lcore_id
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* lcore id.
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*
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* @return
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* - 0 on success.
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* - Negative on error.
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*/
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int rte_power_exit(unsigned lcore_id);
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/**
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* Get the available frequencies of a specific lcore. The return value will be
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* the minimal one of the total number of available frequencies and the number
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* of buffer. The index of available frequencies used in other interfaces
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* should be in the range of 0 to this return value.
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* It should be protected outside of this function for threadsafe.
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*
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* @param lcore_id
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* lcore id.
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* @param freqs
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* The buffer array to save the frequencies.
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* @param num
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* The number of frequencies to get.
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*
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* @return
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* The number of available frequencies.
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*/
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uint32_t rte_power_freqs(unsigned lcore_id, uint32_t *freqs, uint32_t num);
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/**
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* Return the current index of available frequencies of a specific lcore. It
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* will return 'RTE_POWER_INVALID_FREQ_INDEX = (~0)' if error.
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* It should be protected outside of this function for threadsafe.
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*
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* @param lcore_id
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* lcore id.
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*
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* @return
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* The current index of available frequencies.
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*/
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uint32_t rte_power_get_freq(unsigned lcore_id);
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/**
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* Set the new frequency for a specific lcore by indicating the index of
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* available frequencies.
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* It should be protected outside of this function for threadsafe.
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*
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* @param lcore_id
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* lcore id.
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* @param index
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* The index of available frequencies.
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*
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* @return
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* - 1 on success with frequency changed.
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* - 0 on success without frequency chnaged.
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* - Negative on error.
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*/
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int rte_power_set_freq(unsigned lcore_id, uint32_t index);
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/**
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* Scale up the frequency of a specific lcore according to the available
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* frequencies.
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* It should be protected outside of this function for threadsafe.
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*
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* @param lcore_id
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* lcore id.
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*
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* @return
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* - 1 on success with frequency changed.
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* - 0 on success without frequency chnaged.
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* - Negative on error.
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*/
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int rte_power_freq_up(unsigned lcore_id);
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/**
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* Scale down the frequency of a specific lcore according to the available
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* frequencies.
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* It should be protected outside of this function for threadsafe.
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*
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* @param lcore_id
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* lcore id.
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*
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* @return
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* - 1 on success with frequency changed.
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* - 0 on success without frequency chnaged.
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* - Negative on error.
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*/
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int rte_power_freq_down(unsigned lcore_id);
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/**
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* Scale up the frequency of a specific lcore to the highest according to the
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* available frequencies.
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* It should be protected outside of this function for threadsafe.
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*
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* @param lcore_id
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* lcore id.
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*
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* @return
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* - 1 on success with frequency changed.
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* - 0 on success without frequency chnaged.
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* - Negative on error.
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*/
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int rte_power_freq_max(unsigned lcore_id);
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/**
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* Scale down the frequency of a specific lcore to the lowest according to the
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* available frequencies.
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* It should be protected outside of this function for threadsafe.
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*
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* @param lcore_id
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* lcore id.
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*
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* @return
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* - 1 on success with frequency changed.
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* - 0 on success without frequency chnaged.
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* - Negative on error.
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*/
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int rte_power_freq_min(unsigned lcore_id);
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#ifdef __cplusplus
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}
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#endif
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#endif
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