ceph/src/dpdk/examples/vm_power_manager/power_manager.h

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #ifndef POWER_MANAGER_H_
  35 #define POWER_MANAGER_H_
  36
  37 #ifdef __cplusplus
  38 extern "C" {
  39 #endif
  40
  41 /* Maximum number of CPUS to manage */
  42 #define POWER_MGR_MAX_CPUS 64
  43 /**
  44  * Initialize power management.
  45  * Initializes resources and verifies the number of CPUs on the system.
  46  * Wraps librte_power int rte_power_init(unsigned lcore_id);
  47  *
  48  * @return
  49  *  - 0 on success.
  50  *  - Negative on error.
  51  */
  52 int power_manager_init(void);
  53
  54 /**
  55  * Exit power management. Must be called prior to exiting the application.
  56  *
  57  * @return
  58  *  - 0 on success.
  59  *  - Negative on error.
  60  */
  61 int power_manager_exit(void);
  62
  63 /**
  64  * Scale up the frequency of the cores specified in core_mask.
  65  * It is thread-safe.
  66  *
  67  * @param core_mask
  68  *  The uint64_t bit-mask of cores to change frequency.
  69  *
  70  * @return
  71  *  - 1 on success.
  72  *  - Negative on error.
  73  */
  74 int power_manager_scale_mask_up(uint64_t core_mask);
  75
  76 /**
  77  * Scale down the frequency of the cores specified in core_mask.
  78  * It is thread-safe.
  79  *
  80  * @param core_mask
  81  *  The uint64_t bit-mask of cores to change frequency.
  82  *
  83  * @return
  84  *  - 1 on success.
  85  *  - Negative on error.
  86  */
  87 int power_manager_scale_mask_down(uint64_t core_mask);
  88
  89 /**
  90  * Scale to the minimum frequency of the cores specified in core_mask.
  91  * It is thread-safe.
  92  *
  93  * @param core_mask
  94  *  The uint64_t bit-mask of cores to change frequency.
  95  *
  96  * @return
  97  *  - 1 on success.
  98  *  - Negative on error.
  99  */
 100 int power_manager_scale_mask_min(uint64_t core_mask);
 101
 102 /**
 103  * Scale to the maximum frequency of the cores specified in core_mask.
 104  * It is thread-safe.
 105  *
 106  * @param core_mask
 107  *  The uint64_t bit-mask of cores to change frequency.
 108  *
 109  * @return
 110  *  - 1 on success.
 111  *  - Negative on error.
 112  */
 113 int power_manager_scale_mask_max(uint64_t core_mask);
 114
 115 /**
 116  * Scale up frequency for the core specified by core_num.
 117  * It is thread-safe.
 118  *
 119  * @param core_num
 120  *  The core number to change frequency
 121  *
 122  * @return
 123  *  - 1 on success.
 124  *  - Negative on error.
 125  */
 126 int power_manager_scale_core_up(unsigned core_num);
 127
 128 /**
 129  * Scale down frequency for the core specified by core_num.
 130  * It is thread-safe.
 131  *
 132  * @param core_num
 133  *  The core number to change frequency
 134  *
 135  * @return
 136  *  - 1 on success.
 137  *  - 0 if frequency not changed.
 138  *  - Negative on error.
 139  */
 140 int power_manager_scale_core_down(unsigned core_num);
 141
 142 /**
 143  * Scale to minimum frequency for the core specified by core_num.
 144  * It is thread-safe.
 145  *
 146  * @param core_num
 147  *  The core number to change frequency
 148  *
 149  * @return
 150  *  - 1 on success.
 151  *  - 0 if frequency not changed.
 152  *  - Negative on error.
 153  */
 154 int power_manager_scale_core_min(unsigned core_num);
 155
 156 /**
 157  * Scale to maximum frequency for the core specified by core_num.
 158  * It is thread-safe.
 159  *
 160  * @param core_num
 161  *  The core number to change frequency
 162  *
 163  * @return
 164  *  - 1 on success.
 165  *  - 0 if frequency not changed.
 166  *  - Negative on error.
 167  */
 168 int power_manager_scale_core_max(unsigned core_num);
 169
 170 /**
 171  * Get the current freuency of the core specified by core_num
 172  *
 173  * @param core_num
 174  *  The core number to get the current frequency
 175  *
 176  * @return
 177  *  - 0  on error
 178  *  - >0 for current frequency.
 179  */
 180 uint32_t power_manager_get_current_frequency(unsigned core_num);
 181
 182
 183 #ifdef __cplusplus
 184 }
 185 #endif
 186
 187
 188 #endif /* POWER_MANAGER_H_ */