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