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 #define POWER_SCALE_MASK(DIRECTION, core_mask, ret) do { \
  37         int i; \
  38         for (i = 0; core_mask; core_mask &= ~(1 << i++)) { \
  39                 if ((core_mask >> i) & 1) { \
  40                         if (!(ci.cd[i].global_enabled_cpus)) \
  41                                 continue; \
  42                         rte_spinlock_lock(&global_core_freq_info[i].power_sl); \
  43                         if (rte_power_freq_##DIRECTION(i) != 1) \
  44                                 ret = -1; \
  45                         rte_spinlock_unlock(&global_core_freq_info[i].power_sl); \
  46                 } \
  47         } \
  48 } while (0)
  49
  50 struct freq_info {
  51         rte_spinlock_t power_sl;
  52         uint32_t freqs[RTE_MAX_LCORE_FREQS];
  53         unsigned num_freqs;
  54 } __rte_cache_aligned;
  55
  56 static struct freq_info global_core_freq_info[POWER_MGR_MAX_CPUS];
  57
  58 struct core_info ci;
  59
  60 #define SYSFS_CPU_PATH "/sys/devices/system/cpu/cpu%u/topology/core_id"
  61
  62 struct core_info *
  63 get_core_info(void)
  64 {
  65         return &ci;
  66 }
  67
  68 int
  69 core_info_init(void)
  70 {
  71         struct core_info *ci;
  72         int i;
  73
  74         ci = get_core_info();
  75
  76         ci->core_count = get_nprocs_conf();
  77         ci->branch_ratio_threshold = BRANCH_RATIO_THRESHOLD;
  78         ci->cd = malloc(ci->core_count * sizeof(struct core_details));
  79         if (!ci->cd) {
  80                 RTE_LOG(ERR, POWER_MANAGER, "Failed to allocate memory for core info.");
  81                 return -1;
  82         }
  83         for (i = 0; i < ci->core_count; i++) {
  84                 ci->cd[i].global_enabled_cpus = 1;
  85                 ci->cd[i].oob_enabled = 0;
  86                 ci->cd[i].msr_fd = 0;
  87         }
  88         printf("%d cores in system\n", ci->core_count);
  89         return 0;
  90 }
  91
  92 int
  93 power_manager_init(void)
  94 {
  95         unsigned int i, num_cpus = 0, num_freqs = 0;
  96         int ret = 0;
  97         struct core_info *ci;
  98
  99         rte_power_set_env(PM_ENV_ACPI_CPUFREQ);
 100
 101         ci = get_core_info();
 102         if (!ci) {
 103                 RTE_LOG(ERR, POWER_MANAGER,
 104                                 "Failed to get core info!\n");
 105                 return -1;
 106         }
 107
 108         for (i = 0; i < ci->core_count; i++) {
 109                 if (ci->cd[i].global_enabled_cpus) {
 110                         if (rte_power_init(i) < 0)
 111                                 RTE_LOG(ERR, POWER_MANAGER,
 112                                                 "Unable to initialize power manager "
 113                                                 "for core %u\n", i);
 114                         num_cpus++;
 115                         num_freqs = rte_power_freqs(i,
 116                                         global_core_freq_info[i].freqs,
 117                                         RTE_MAX_LCORE_FREQS);
 118                         if (num_freqs == 0) {
 119                                 RTE_LOG(ERR, POWER_MANAGER,
 120                                         "Unable to get frequency list for core %u\n",
 121                                         i);
 122                                 ci->cd[i].oob_enabled = 0;
 123                                 ret = -1;
 124                         }
 125                         global_core_freq_info[i].num_freqs = num_freqs;
 126
 127                         rte_spinlock_init(&global_core_freq_info[i].power_sl);
 128                 }
 129                 if (ci->cd[i].oob_enabled)
 130                         add_core_to_monitor(i);
 131         }
 132         RTE_LOG(INFO, POWER_MANAGER, "Managing %u cores out of %u available host cores\n",
 133                         num_cpus, ci->core_count);
 134         return ret;
 135
 136 }
 137
 138 uint32_t
 139 power_manager_get_current_frequency(unsigned core_num)
 140 {
 141         uint32_t freq, index;
 142
 143         if (core_num >= POWER_MGR_MAX_CPUS) {
 144                 RTE_LOG(ERR, POWER_MANAGER, "Core(%u) is out of range 0...%d\n",
 145                                 core_num, POWER_MGR_MAX_CPUS-1);
 146                 return -1;
 147         }
 148         if (!(ci.cd[core_num].global_enabled_cpus))
 149                 return 0;
 150
 151         rte_spinlock_lock(&global_core_freq_info[core_num].power_sl);
 152         index = rte_power_get_freq(core_num);
 153         rte_spinlock_unlock(&global_core_freq_info[core_num].power_sl);
 154         if (index >= POWER_MGR_MAX_CPUS)
 155                 freq = 0;
 156         else
 157                 freq = global_core_freq_info[core_num].freqs[index];
 158
 159         return freq;
 160 }
 161
 162 int
 163 power_manager_exit(void)
 164 {
 165         unsigned int i;
 166         int ret = 0;
 167         struct core_info *ci;
 168
 169         ci = get_core_info();
 170         if (!ci) {
 171                 RTE_LOG(ERR, POWER_MANAGER,
 172                                 "Failed to get core info!\n");
 173                 return -1;
 174         }
 175
 176         for (i = 0; i < ci->core_count; i++) {
 177                 if (ci->cd[i].global_enabled_cpus) {
 178                         if (rte_power_exit(i) < 0) {
 179                                 RTE_LOG(ERR, POWER_MANAGER, "Unable to shutdown power manager "
 180                                                 "for core %u\n", i);
 181                                 ret = -1;
 182                         }
 183                         ci->cd[i].global_enabled_cpus = 0;
 184                 }
 185                 remove_core_from_monitor(i);
 186         }
 187         return ret;
 188 }
 189
 190 int
 191 power_manager_scale_mask_up(uint64_t core_mask)
 192 {
 193         int ret = 0;
 194
 195         POWER_SCALE_MASK(up, core_mask, ret);
 196         return ret;
 197 }
 198
 199 int
 200 power_manager_scale_mask_down(uint64_t core_mask)
 201 {
 202         int ret = 0;
 203
 204         POWER_SCALE_MASK(down, core_mask, ret);
 205         return ret;
 206 }
 207
 208 int
 209 power_manager_scale_mask_min(uint64_t core_mask)
 210 {
 211         int ret = 0;
 212
 213         POWER_SCALE_MASK(min, core_mask, ret);
 214         return ret;
 215 }
 216
 217 int
 218 power_manager_scale_mask_max(uint64_t core_mask)
 219 {
 220         int ret = 0;
 221
 222         POWER_SCALE_MASK(max, core_mask, ret);
 223         return ret;
 224 }
 225
 226 int
 227 power_manager_enable_turbo_mask(uint64_t core_mask)
 228 {
 229         int ret = 0;
 230
 231         POWER_SCALE_MASK(enable_turbo, core_mask, ret);
 232         return ret;
 233 }
 234
 235 int
 236 power_manager_disable_turbo_mask(uint64_t core_mask)
 237 {
 238         int ret = 0;
 239
 240         POWER_SCALE_MASK(disable_turbo, core_mask, ret);
 241         return ret;
 242 }
 243
 244 int
 245 power_manager_scale_core_up(unsigned core_num)
 246 {
 247         int ret = 0;
 248
 249         POWER_SCALE_CORE(up, core_num, ret);
 250         return ret;
 251 }
 252
 253 int
 254 power_manager_scale_core_down(unsigned core_num)
 255 {
 256         int ret = 0;
 257
 258         POWER_SCALE_CORE(down, core_num, ret);
 259         return ret;
 260 }
 261
 262 int
 263 power_manager_scale_core_min(unsigned core_num)
 264 {
 265         int ret = 0;
 266
 267         POWER_SCALE_CORE(min, core_num, ret);
 268         return ret;
 269 }
 270
 271 int
 272 power_manager_scale_core_max(unsigned core_num)
 273 {
 274         int ret = 0;
 275
 276         POWER_SCALE_CORE(max, core_num, ret);
 277         return ret;
 278 }
 279
 280 int
 281 power_manager_enable_turbo_core(unsigned int core_num)
 282 {
 283         int ret = 0;
 284
 285         POWER_SCALE_CORE(enable_turbo, core_num, ret);
 286         return ret;
 287 }
 288
 289 int
 290 power_manager_disable_turbo_core(unsigned int core_num)
 291 {
 292         int ret = 0;
 293
 294         POWER_SCALE_CORE(disable_turbo, core_num, ret);
 295         return ret;
 296 }
 297
 298 int
 299 power_manager_scale_core_med(unsigned int core_num)
 300 {
 301         int ret = 0;
 302         struct core_info *ci;
 303
 304         ci = get_core_info();
 305         if (core_num >= POWER_MGR_MAX_CPUS)
 306                 return -1;
 307         if (!(ci->cd[core_num].global_enabled_cpus))
 308                 return -1;
 309         rte_spinlock_lock(&global_core_freq_info[core_num].power_sl);
 310         ret = rte_power_set_freq(core_num,
 311                                 global_core_freq_info[core_num].num_freqs / 2);
 312         rte_spinlock_unlock(&global_core_freq_info[core_num].power_sl);
 313         return ret;
 314 }