examples/vm_power_manager/power_manager.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <stdint.h>
   8 #include <inttypes.h>
   9 #include <sys/un.h>
  10 #include <fcntl.h>
  11 #include <unistd.h>
  12 #include <dirent.h>
  13 #include <errno.h>
  14
  15 #include <sys/sysinfo.h>
  16 #include <sys/types.h>
  17
  18 #include <rte_log.h>
  19 #include <rte_power.h>
  20 #include <rte_spinlock.h>
  21
  22 #include "channel_manager.h"
  23 #include "power_manager.h"
  24 #include "oob_monitor.h"
  25
  26 #define POWER_SCALE_CORE(DIRECTION, core_num , ret) do { \
  27         if (core_num >= ci.core_count) \
  28                 return -1; \
  29         if (!(ci.cd[core_num].global_enabled_cpus)) \
  30                 return -1; \
  31         rte_spinlock_lock(&global_core_freq_info[core_num].power_sl); \
  32         ret = rte_power_freq_##DIRECTION(core_num); \
  33         rte_spinlock_unlock(&global_core_freq_info[core_num].power_sl); \
  34 } while (0)
  35
  36 struct freq_info {
  37         rte_spinlock_t power_sl;
  38         uint32_t freqs[RTE_MAX_LCORE_FREQS];
  39         unsigned num_freqs;
  40 } __rte_cache_aligned;
  41
  42 static struct freq_info global_core_freq_info[RTE_MAX_LCORE];
  43
  44 struct core_info ci;
  45
  46 #define SYSFS_CPU_PATH "/sys/devices/system/cpu/cpu%u/topology/core_id"
  47
  48 struct core_info *
  49 get_core_info(void)
  50 {
  51         return &ci;
  52 }
  53
  54 int
  55 core_info_init(void)
  56 {
  57         struct core_info *ci;
  58         int i;
  59
  60         ci = get_core_info();
  61
  62         ci->core_count = get_nprocs_conf();
  63         ci->branch_ratio_threshold = BRANCH_RATIO_THRESHOLD;
  64         ci->cd = malloc(ci->core_count * sizeof(struct core_details));
  65         memset(ci->cd, 0, ci->core_count * sizeof(struct core_details));
  66         if (!ci->cd) {
  67                 RTE_LOG(ERR, POWER_MANAGER, "Failed to allocate memory for core info.");
  68                 return -1;
  69         }
  70         for (i = 0; i < ci->core_count; i++) {
  71                 ci->cd[i].global_enabled_cpus = 1;
  72         }
  73         printf("%d cores in system\n", ci->core_count);
  74         return 0;
  75 }
  76
  77 int
  78 power_manager_init(void)
  79 {
  80         unsigned int i, num_cpus = 0, num_freqs = 0;
  81         int ret = 0;
  82         struct core_info *ci;
  83         unsigned int max_core_num;
  84
  85         rte_power_set_env(PM_ENV_NOT_SET);
  86
  87         ci = get_core_info();
  88         if (!ci) {
  89                 RTE_LOG(ERR, POWER_MANAGER,
  90                                 "Failed to get core info!\n");
  91                 return -1;
  92         }
  93
  94         if (ci->core_count > RTE_MAX_LCORE)
  95                 max_core_num = RTE_MAX_LCORE;
  96         else
  97                 max_core_num = ci->core_count;
  98
  99         for (i = 0; i < max_core_num; i++) {
 100                 if (ci->cd[i].global_enabled_cpus) {
 101                         if (rte_power_init(i) < 0)
 102                                 RTE_LOG(ERR, POWER_MANAGER,
 103                                                 "Unable to initialize power manager "
 104                                                 "for core %u\n", i);
 105                         num_cpus++;
 106                         num_freqs = rte_power_freqs(i,
 107                                         global_core_freq_info[i].freqs,
 108                                         RTE_MAX_LCORE_FREQS);
 109                         if (num_freqs == 0) {
 110                                 RTE_LOG(ERR, POWER_MANAGER,
 111                                         "Unable to get frequency list for core %u\n",
 112                                         i);
 113                                 ci->cd[i].oob_enabled = 0;
 114                                 ret = -1;
 115                         }
 116                         global_core_freq_info[i].num_freqs = num_freqs;
 117
 118                         rte_spinlock_init(&global_core_freq_info[i].power_sl);
 119                 }
 120                 if (ci->cd[i].oob_enabled)
 121                         add_core_to_monitor(i);
 122         }
 123         RTE_LOG(INFO, POWER_MANAGER, "Managing %u cores out of %u available host cores\n",
 124                         num_cpus, ci->core_count);
 125         return ret;
 126
 127 }
 128
 129 uint32_t
 130 power_manager_get_current_frequency(unsigned core_num)
 131 {
 132         uint32_t freq, index;
 133
 134         if (core_num >= RTE_MAX_LCORE) {
 135                 RTE_LOG(ERR, POWER_MANAGER, "Core(%u) is out of range 0...%d\n",
 136                                 core_num, RTE_MAX_LCORE-1);
 137                 return -1;
 138         }
 139         if (!(ci.cd[core_num].global_enabled_cpus))
 140                 return 0;
 141
 142         rte_spinlock_lock(&global_core_freq_info[core_num].power_sl);
 143         index = rte_power_get_freq(core_num);
 144         rte_spinlock_unlock(&global_core_freq_info[core_num].power_sl);
 145         if (index >= RTE_MAX_LCORE_FREQS)
 146                 freq = 0;
 147         else
 148                 freq = global_core_freq_info[core_num].freqs[index];
 149
 150         return freq;
 151 }
 152
 153 int
 154 power_manager_exit(void)
 155 {
 156         unsigned int i;
 157         int ret = 0;
 158         struct core_info *ci;
 159         unsigned int max_core_num;
 160
 161         ci = get_core_info();
 162         if (!ci) {
 163                 RTE_LOG(ERR, POWER_MANAGER,
 164                                 "Failed to get core info!\n");
 165                 return -1;
 166         }
 167
 168         if (ci->core_count > RTE_MAX_LCORE)
 169                 max_core_num = RTE_MAX_LCORE;
 170         else
 171                 max_core_num = ci->core_count;
 172
 173         for (i = 0; i < max_core_num; i++) {
 174                 if (ci->cd[i].global_enabled_cpus) {
 175                         if (rte_power_exit(i) < 0) {
 176                                 RTE_LOG(ERR, POWER_MANAGER, "Unable to shutdown power manager "
 177                                                 "for core %u\n", i);
 178                                 ret = -1;
 179                         }
 180                         ci->cd[i].global_enabled_cpus = 0;
 181                 }
 182                 remove_core_from_monitor(i);
 183         }
 184         return ret;
 185 }
 186
 187 int
 188 power_manager_scale_core_up(unsigned core_num)
 189 {
 190         int ret = 0;
 191
 192         POWER_SCALE_CORE(up, core_num, ret);
 193         return ret;
 194 }
 195
 196 int
 197 power_manager_scale_core_down(unsigned core_num)
 198 {
 199         int ret = 0;
 200
 201         POWER_SCALE_CORE(down, core_num, ret);
 202         return ret;
 203 }
 204
 205 int
 206 power_manager_scale_core_min(unsigned core_num)
 207 {
 208         int ret = 0;
 209
 210         POWER_SCALE_CORE(min, core_num, ret);
 211         return ret;
 212 }
 213
 214 int
 215 power_manager_scale_core_max(unsigned core_num)
 216 {
 217         int ret = 0;
 218
 219         POWER_SCALE_CORE(max, core_num, ret);
 220         return ret;
 221 }
 222
 223 int
 224 power_manager_enable_turbo_core(unsigned int core_num)
 225 {
 226         int ret = 0;
 227
 228         POWER_SCALE_CORE(enable_turbo, core_num, ret);
 229         return ret;
 230 }
 231
 232 int
 233 power_manager_disable_turbo_core(unsigned int core_num)
 234 {
 235         int ret = 0;
 236
 237         POWER_SCALE_CORE(disable_turbo, core_num, ret);
 238         return ret;
 239 }
 240
 241 int
 242 power_manager_scale_core_med(unsigned int core_num)
 243 {
 244         int ret = 0;
 245         struct core_info *ci;
 246
 247         ci = get_core_info();
 248         if (core_num >= RTE_MAX_LCORE)
 249                 return -1;
 250         if (!(ci->cd[core_num].global_enabled_cpus))
 251                 return -1;
 252         rte_spinlock_lock(&global_core_freq_info[core_num].power_sl);
 253         ret = rte_power_set_freq(core_num,
 254                                 global_core_freq_info[core_num].num_freqs / 2);
 255         rte_spinlock_unlock(&global_core_freq_info[core_num].power_sl);
 256         return ret;
 257 }