lib/librte_power/rte_power_acpi_cpufreq.c

   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 #include <stdio.h>
  35 #include <sys/types.h>
  36 #include <sys/stat.h>
  37 #include <fcntl.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <unistd.h>
  41 #include <signal.h>
  42 #include <limits.h>
  43
  44 #include <rte_memcpy.h>
  45 #include <rte_atomic.h>
  46
  47 #include "rte_power_acpi_cpufreq.h"
  48 #include "rte_power_common.h"
  49
  50 #ifdef RTE_LIBRTE_POWER_DEBUG
  51 #define POWER_DEBUG_TRACE(fmt, args...) do { \
  52                 RTE_LOG(ERR, POWER, "%s: " fmt, __func__, ## args); \
  53 } while (0)
  54 #else
  55 #define POWER_DEBUG_TRACE(fmt, args...)
  56 #endif
  57
  58 #define FOPEN_OR_ERR_RET(f, retval) do { \
  59                 if ((f) == NULL) { \
  60                         RTE_LOG(ERR, POWER, "File not openned\n"); \
  61                         return retval; \
  62                 } \
  63 } while (0)
  64
  65 #define FOPS_OR_NULL_GOTO(ret, label) do { \
  66                 if ((ret) == NULL) { \
  67                         RTE_LOG(ERR, POWER, "fgets returns nothing\n"); \
  68                         goto label; \
  69                 } \
  70 } while (0)
  71
  72 #define FOPS_OR_ERR_GOTO(ret, label) do { \
  73                 if ((ret) < 0) { \
  74                         RTE_LOG(ERR, POWER, "File operations failed\n"); \
  75                         goto label; \
  76                 } \
  77 } while (0)
  78
  79 #define STR_SIZE     1024
  80 #define POWER_CONVERT_TO_DECIMAL 10
  81
  82 #define POWER_GOVERNOR_USERSPACE "userspace"
  83 #define POWER_SYSFILE_GOVERNOR   \
  84                 "/sys/devices/system/cpu/cpu%u/cpufreq/scaling_governor"
  85 #define POWER_SYSFILE_AVAIL_FREQ \
  86                 "/sys/devices/system/cpu/cpu%u/cpufreq/scaling_available_frequencies"
  87 #define POWER_SYSFILE_SETSPEED   \
  88                 "/sys/devices/system/cpu/cpu%u/cpufreq/scaling_setspeed"
  89
  90 /*
  91  * MSR related
  92  */
  93 #define PLATFORM_INFO     0x0CE
  94 #define TURBO_RATIO_LIMIT 0x1AD
  95 #define IA32_PERF_CTL     0x199
  96 #define CORE_TURBO_DISABLE_BIT ((uint64_t)1<<32)
  97
  98 enum power_state {
  99         POWER_IDLE = 0,
 100         POWER_ONGOING,
 101         POWER_USED,
 102         POWER_UNKNOWN
 103 };
 104
 105 /**
 106  * Power info per lcore.
 107  */
 108 struct rte_power_info {
 109         unsigned lcore_id;                   /**< Logical core id */
 110         uint32_t freqs[RTE_MAX_LCORE_FREQS]; /**< Frequency array */
 111         uint32_t nb_freqs;                   /**< number of available freqs */
 112         FILE *f;                             /**< FD of scaling_setspeed */
 113         char governor_ori[32];               /**< Original governor name */
 114         uint32_t curr_idx;                   /**< Freq index in freqs array */
 115         volatile uint32_t state;             /**< Power in use state */
 116         uint16_t turbo_available;            /**< Turbo Boost available */
 117         uint16_t turbo_enable;               /**< Turbo Boost enable/disable */
 118 } __rte_cache_aligned;
 119
 120 static struct rte_power_info lcore_power_info[RTE_MAX_LCORE];
 121
 122 /**
 123  * It is to set specific freq for specific logical core, according to the index
 124  * of supported frequencies.
 125  */
 126 static int
 127 set_freq_internal(struct rte_power_info *pi, uint32_t idx)
 128 {
 129         if (idx >= RTE_MAX_LCORE_FREQS || idx >= pi->nb_freqs) {
 130                 RTE_LOG(ERR, POWER, "Invalid frequency index %u, which "
 131                                 "should be less than %u\n", idx, pi->nb_freqs);
 132                 return -1;
 133         }
 134
 135         /* Check if it is the same as current */
 136         if (idx == pi->curr_idx)
 137                 return 0;
 138
 139         POWER_DEBUG_TRACE("Freqency[%u] %u to be set for lcore %u\n",
 140                         idx, pi->freqs[idx], pi->lcore_id);
 141         if (fseek(pi->f, 0, SEEK_SET) < 0) {
 142                 RTE_LOG(ERR, POWER, "Fail to set file position indicator to 0 "
 143                                 "for setting frequency for lcore %u\n", pi->lcore_id);
 144                 return -1;
 145         }
 146         if (fprintf(pi->f, "%u", pi->freqs[idx]) < 0) {
 147                 RTE_LOG(ERR, POWER, "Fail to write new frequency for "
 148                                 "lcore %u\n", pi->lcore_id);
 149                 return -1;
 150         }
 151         fflush(pi->f);
 152         pi->curr_idx = idx;
 153
 154         return 1;
 155 }
 156
 157 /**
 158  * It is to check the current scaling governor by reading sys file, and then
 159  * set it into 'userspace' if it is not by writing the sys file. The original
 160  * governor will be saved for rolling back.
 161  */
 162 static int
 163 power_set_governor_userspace(struct rte_power_info *pi)
 164 {
 165         FILE *f;
 166         int ret = -1;
 167         char buf[BUFSIZ];
 168         char fullpath[PATH_MAX];
 169         char *s;
 170         int val;
 171
 172         snprintf(fullpath, sizeof(fullpath), POWER_SYSFILE_GOVERNOR,
 173                         pi->lcore_id);
 174         f = fopen(fullpath, "rw+");
 175         FOPEN_OR_ERR_RET(f, ret);
 176
 177         s = fgets(buf, sizeof(buf), f);
 178         FOPS_OR_NULL_GOTO(s, out);
 179
 180         /* Check if current governor is userspace */
 181         if (strncmp(buf, POWER_GOVERNOR_USERSPACE,
 182                         sizeof(POWER_GOVERNOR_USERSPACE)) == 0) {
 183                 ret = 0;
 184                 POWER_DEBUG_TRACE("Power management governor of lcore %u is "
 185                                 "already userspace\n", pi->lcore_id);
 186                 goto out;
 187         }
 188         /* Save the original governor */
 189         snprintf(pi->governor_ori, sizeof(pi->governor_ori), "%s", buf);
 190
 191         /* Write 'userspace' to the governor */
 192         val = fseek(f, 0, SEEK_SET);
 193         FOPS_OR_ERR_GOTO(val, out);
 194
 195         val = fputs(POWER_GOVERNOR_USERSPACE, f);
 196         FOPS_OR_ERR_GOTO(val, out);
 197
 198         ret = 0;
 199         RTE_LOG(INFO, POWER, "Power management governor of lcore %u has been "
 200                         "set to user space successfully\n", pi->lcore_id);
 201 out:
 202         fclose(f);
 203
 204         return ret;
 205 }
 206
 207 /**
 208  * It is to get the available frequencies of the specific lcore by reading the
 209  * sys file.
 210  */
 211 static int
 212 power_get_available_freqs(struct rte_power_info *pi)
 213 {
 214         FILE *f;
 215         int ret = -1, i, count;
 216         char *p;
 217         char buf[BUFSIZ];
 218         char fullpath[PATH_MAX];
 219         char *freqs[RTE_MAX_LCORE_FREQS];
 220         char *s;
 221
 222         snprintf(fullpath, sizeof(fullpath), POWER_SYSFILE_AVAIL_FREQ,
 223                         pi->lcore_id);
 224         f = fopen(fullpath, "r");
 225         FOPEN_OR_ERR_RET(f, ret);
 226
 227         s = fgets(buf, sizeof(buf), f);
 228         FOPS_OR_NULL_GOTO(s, out);
 229
 230         /* Strip the line break if there is */
 231         p = strchr(buf, '\n');
 232         if (p != NULL)
 233                 *p = 0;
 234
 235         /* Split string into at most RTE_MAX_LCORE_FREQS frequencies */
 236         count = rte_strsplit(buf, sizeof(buf), freqs,
 237                         RTE_MAX_LCORE_FREQS, ' ');
 238         if (count <= 0) {
 239                 RTE_LOG(ERR, POWER, "No available frequency in "
 240                                 ""POWER_SYSFILE_AVAIL_FREQ"\n", pi->lcore_id);
 241                 goto out;
 242         }
 243         if (count >= RTE_MAX_LCORE_FREQS) {
 244                 RTE_LOG(ERR, POWER, "Too many available frequencies : %d\n",
 245                                 count);
 246                 goto out;
 247         }
 248
 249         /* Store the available frequncies into power context */
 250         for (i = 0, pi->nb_freqs = 0; i < count; i++) {
 251                 POWER_DEBUG_TRACE("Lcore %u frequency[%d]: %s\n", pi->lcore_id,
 252                                 i, freqs[i]);
 253                 pi->freqs[pi->nb_freqs++] = strtoul(freqs[i], &p,
 254                                 POWER_CONVERT_TO_DECIMAL);
 255         }
 256
 257         if ((pi->freqs[0]-1000) == pi->freqs[1]) {
 258                 pi->turbo_available = 1;
 259                 pi->turbo_enable = 1;
 260                 POWER_DEBUG_TRACE("Lcore %u Can do Turbo Boost\n",
 261                                 pi->lcore_id);
 262         } else {
 263                 pi->turbo_available = 0;
 264                 pi->turbo_enable = 0;
 265                 POWER_DEBUG_TRACE("Turbo Boost not available on Lcore %u\n",
 266                                 pi->lcore_id);
 267         }
 268
 269         ret = 0;
 270         POWER_DEBUG_TRACE("%d frequencie(s) of lcore %u are available\n",
 271                         count, pi->lcore_id);
 272 out:
 273         fclose(f);
 274
 275         return ret;
 276 }
 277
 278 /**
 279  * It is to fopen the sys file for the future setting the lcore frequency.
 280  */
 281 static int
 282 power_init_for_setting_freq(struct rte_power_info *pi)
 283 {
 284         FILE *f;
 285         char fullpath[PATH_MAX];
 286         char buf[BUFSIZ];
 287         uint32_t i, freq;
 288         char *s;
 289
 290         snprintf(fullpath, sizeof(fullpath), POWER_SYSFILE_SETSPEED,
 291                         pi->lcore_id);
 292         f = fopen(fullpath, "rw+");
 293         FOPEN_OR_ERR_RET(f, -1);
 294
 295         s = fgets(buf, sizeof(buf), f);
 296         FOPS_OR_NULL_GOTO(s, out);
 297
 298         freq = strtoul(buf, NULL, POWER_CONVERT_TO_DECIMAL);
 299         for (i = 0; i < pi->nb_freqs; i++) {
 300                 if (freq == pi->freqs[i]) {
 301                         pi->curr_idx = i;
 302                         pi->f = f;
 303                         return 0;
 304                 }
 305         }
 306
 307 out:
 308         fclose(f);
 309
 310         return -1;
 311 }
 312
 313 int
 314 rte_power_acpi_cpufreq_init(unsigned lcore_id)
 315 {
 316         struct rte_power_info *pi;
 317
 318         if (lcore_id >= RTE_MAX_LCORE) {
 319                 RTE_LOG(ERR, POWER, "Lcore id %u can not exceeds %u\n",
 320                                 lcore_id, RTE_MAX_LCORE - 1U);
 321                 return -1;
 322         }
 323
 324         pi = &lcore_power_info[lcore_id];
 325         if (rte_atomic32_cmpset(&(pi->state), POWER_IDLE, POWER_ONGOING)
 326                         == 0) {
 327                 RTE_LOG(INFO, POWER, "Power management of lcore %u is "
 328                                 "in use\n", lcore_id);
 329                 return -1;
 330         }
 331
 332         pi->lcore_id = lcore_id;
 333         /* Check and set the governor */
 334         if (power_set_governor_userspace(pi) < 0) {
 335                 RTE_LOG(ERR, POWER, "Cannot set governor of lcore %u to "
 336                                 "userspace\n", lcore_id);
 337                 goto fail;
 338         }
 339
 340         /* Get the available frequencies */
 341         if (power_get_available_freqs(pi) < 0) {
 342                 RTE_LOG(ERR, POWER, "Cannot get available frequencies of "
 343                                 "lcore %u\n", lcore_id);
 344                 goto fail;
 345         }
 346
 347         /* Init for setting lcore frequency */
 348         if (power_init_for_setting_freq(pi) < 0) {
 349                 RTE_LOG(ERR, POWER, "Cannot init for setting frequency for "
 350                                 "lcore %u\n", lcore_id);
 351                 goto fail;
 352         }
 353
 354         /* Set freq to max by default */
 355         if (rte_power_acpi_cpufreq_freq_max(lcore_id) < 0) {
 356                 RTE_LOG(ERR, POWER, "Cannot set frequency of lcore %u "
 357                                 "to max\n", lcore_id);
 358                 goto fail;
 359         }
 360
 361         RTE_LOG(INFO, POWER, "Initialized successfully for lcore %u "
 362                         "power manamgement\n", lcore_id);
 363         rte_atomic32_cmpset(&(pi->state), POWER_ONGOING, POWER_USED);
 364
 365         return 0;
 366
 367 fail:
 368         rte_atomic32_cmpset(&(pi->state), POWER_ONGOING, POWER_UNKNOWN);
 369
 370         return -1;
 371 }
 372
 373 /**
 374  * It is to check the governor and then set the original governor back if
 375  * needed by writing the the sys file.
 376  */
 377 static int
 378 power_set_governor_original(struct rte_power_info *pi)
 379 {
 380         FILE *f;
 381         int ret = -1;
 382         char buf[BUFSIZ];
 383         char fullpath[PATH_MAX];
 384         char *s;
 385         int val;
 386
 387         snprintf(fullpath, sizeof(fullpath), POWER_SYSFILE_GOVERNOR,
 388                         pi->lcore_id);
 389         f = fopen(fullpath, "rw+");
 390         FOPEN_OR_ERR_RET(f, ret);
 391
 392         s = fgets(buf, sizeof(buf), f);
 393         FOPS_OR_NULL_GOTO(s, out);
 394
 395         /* Check if the governor to be set is the same as current */
 396         if (strncmp(buf, pi->governor_ori, sizeof(pi->governor_ori)) == 0) {
 397                 ret = 0;
 398                 POWER_DEBUG_TRACE("Power management governor of lcore %u "
 399                                 "has already been set to %s\n",
 400                                 pi->lcore_id, pi->governor_ori);
 401                 goto out;
 402         }
 403
 404         /* Write back the original governor */
 405         val = fseek(f, 0, SEEK_SET);
 406         FOPS_OR_ERR_GOTO(val, out);
 407
 408         val = fputs(pi->governor_ori, f);
 409         FOPS_OR_ERR_GOTO(val, out);
 410
 411         ret = 0;
 412         RTE_LOG(INFO, POWER, "Power management governor of lcore %u "
 413                         "has been set back to %s successfully\n",
 414                         pi->lcore_id, pi->governor_ori);
 415 out:
 416         fclose(f);
 417
 418         return ret;
 419 }
 420
 421 int
 422 rte_power_acpi_cpufreq_exit(unsigned lcore_id)
 423 {
 424         struct rte_power_info *pi;
 425
 426         if (lcore_id >= RTE_MAX_LCORE) {
 427                 RTE_LOG(ERR, POWER, "Lcore id %u can not exceeds %u\n",
 428                                 lcore_id, RTE_MAX_LCORE - 1U);
 429                 return -1;
 430         }
 431         pi = &lcore_power_info[lcore_id];
 432         if (rte_atomic32_cmpset(&(pi->state), POWER_USED, POWER_ONGOING)
 433                         == 0) {
 434                 RTE_LOG(INFO, POWER, "Power management of lcore %u is "
 435                                 "not used\n", lcore_id);
 436                 return -1;
 437         }
 438
 439         /* Close FD of setting freq */
 440         fclose(pi->f);
 441         pi->f = NULL;
 442
 443         /* Set the governor back to the original */
 444         if (power_set_governor_original(pi) < 0) {
 445                 RTE_LOG(ERR, POWER, "Cannot set the governor of %u back "
 446                                 "to the original\n", lcore_id);
 447                 goto fail;
 448         }
 449
 450         RTE_LOG(INFO, POWER, "Power management of lcore %u has exited from "
 451                         "'userspace' mode and been set back to the "
 452                         "original\n", lcore_id);
 453         rte_atomic32_cmpset(&(pi->state), POWER_ONGOING, POWER_IDLE);
 454
 455         return 0;
 456
 457 fail:
 458         rte_atomic32_cmpset(&(pi->state), POWER_ONGOING, POWER_UNKNOWN);
 459
 460         return -1;
 461 }
 462
 463 uint32_t
 464 rte_power_acpi_cpufreq_freqs(unsigned lcore_id, uint32_t *freqs, uint32_t num)
 465 {
 466         struct rte_power_info *pi;
 467
 468         if (lcore_id >= RTE_MAX_LCORE || !freqs) {
 469                 RTE_LOG(ERR, POWER, "Invalid input parameter\n");
 470                 return 0;
 471         }
 472
 473         pi = &lcore_power_info[lcore_id];
 474         if (num < pi->nb_freqs) {
 475                 RTE_LOG(ERR, POWER, "Buffer size is not enough\n");
 476                 return 0;
 477         }
 478         rte_memcpy(freqs, pi->freqs, pi->nb_freqs * sizeof(uint32_t));
 479
 480         return pi->nb_freqs;
 481 }
 482
 483 uint32_t
 484 rte_power_acpi_cpufreq_get_freq(unsigned lcore_id)
 485 {
 486         if (lcore_id >= RTE_MAX_LCORE) {
 487                 RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
 488                 return RTE_POWER_INVALID_FREQ_INDEX;
 489         }
 490
 491         return lcore_power_info[lcore_id].curr_idx;
 492 }
 493
 494 int
 495 rte_power_acpi_cpufreq_set_freq(unsigned lcore_id, uint32_t index)
 496 {
 497         if (lcore_id >= RTE_MAX_LCORE) {
 498                 RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
 499                 return -1;
 500         }
 501
 502         return set_freq_internal(&(lcore_power_info[lcore_id]), index);
 503 }
 504
 505 int
 506 rte_power_acpi_cpufreq_freq_down(unsigned lcore_id)
 507 {
 508         struct rte_power_info *pi;
 509
 510         if (lcore_id >= RTE_MAX_LCORE) {
 511                 RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
 512                 return -1;
 513         }
 514
 515         pi = &lcore_power_info[lcore_id];
 516         if (pi->curr_idx + 1 == pi->nb_freqs)
 517                 return 0;
 518
 519         /* Frequencies in the array are from high to low. */
 520         return set_freq_internal(pi, pi->curr_idx + 1);
 521 }
 522
 523 int
 524 rte_power_acpi_cpufreq_freq_up(unsigned lcore_id)
 525 {
 526         struct rte_power_info *pi;
 527
 528         if (lcore_id >= RTE_MAX_LCORE) {
 529                 RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
 530                 return -1;
 531         }
 532
 533         pi = &lcore_power_info[lcore_id];
 534         if (pi->curr_idx == 0)
 535                 return 0;
 536
 537         /* Frequencies in the array are from high to low. */
 538         return set_freq_internal(pi, pi->curr_idx - 1);
 539 }
 540
 541 int
 542 rte_power_acpi_cpufreq_freq_max(unsigned lcore_id)
 543 {
 544         if (lcore_id >= RTE_MAX_LCORE) {
 545                 RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
 546                 return -1;
 547         }
 548
 549         /* Frequencies in the array are from high to low. */
 550         if (lcore_power_info[lcore_id].turbo_available) {
 551                 if (lcore_power_info[lcore_id].turbo_enable)
 552                         /* Set to Turbo */
 553                         return set_freq_internal(
 554                                         &lcore_power_info[lcore_id], 0);
 555                 else
 556                         /* Set to max non-turbo */
 557                         return set_freq_internal(
 558                                         &lcore_power_info[lcore_id], 1);
 559         } else
 560                 return set_freq_internal(&lcore_power_info[lcore_id], 0);
 561 }
 562
 563 int
 564 rte_power_acpi_cpufreq_freq_min(unsigned lcore_id)
 565 {
 566         struct rte_power_info *pi;
 567
 568         if (lcore_id >= RTE_MAX_LCORE) {
 569                 RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
 570                 return -1;
 571         }
 572
 573         pi = &lcore_power_info[lcore_id];
 574
 575         /* Frequencies in the array are from high to low. */
 576         return set_freq_internal(pi, pi->nb_freqs - 1);
 577 }
 578
 579
 580 int
 581 rte_power_acpi_turbo_status(unsigned int lcore_id)
 582 {
 583         struct rte_power_info *pi;
 584
 585         if (lcore_id >= RTE_MAX_LCORE) {
 586                 RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
 587                 return -1;
 588         }
 589
 590         pi = &lcore_power_info[lcore_id];
 591
 592         return pi->turbo_enable;
 593 }
 594
 595
 596 int
 597 rte_power_acpi_enable_turbo(unsigned int lcore_id)
 598 {
 599         struct rte_power_info *pi;
 600
 601         if (lcore_id >= RTE_MAX_LCORE) {
 602                 RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
 603                 return -1;
 604         }
 605
 606         pi = &lcore_power_info[lcore_id];
 607
 608         if (pi->turbo_available)
 609                 pi->turbo_enable = 1;
 610         else {
 611                 pi->turbo_enable = 0;
 612                 RTE_LOG(ERR, POWER,
 613                         "Failed to enable turbo on lcore %u\n",
 614                         lcore_id);
 615                         return -1;
 616         }
 617
 618         /* Max may have changed, so call to max function */
 619         if (rte_power_acpi_cpufreq_freq_max(lcore_id) < 0) {
 620                 RTE_LOG(ERR, POWER,
 621                         "Failed to set frequency of lcore %u to max\n",
 622                         lcore_id);
 623                         return -1;
 624         }
 625
 626         return 0;
 627 }
 628
 629 int
 630 rte_power_acpi_disable_turbo(unsigned int lcore_id)
 631 {
 632         struct rte_power_info *pi;
 633
 634         if (lcore_id >= RTE_MAX_LCORE) {
 635                 RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
 636                 return -1;
 637         }
 638
 639         pi = &lcore_power_info[lcore_id];
 640
 641          pi->turbo_enable = 0;
 642
 643         if ((pi->turbo_available) && (pi->curr_idx <= 1)) {
 644                 /* Try to set freq to max by default coming out of turbo */
 645                 if (rte_power_acpi_cpufreq_freq_max(lcore_id) < 0) {
 646                         RTE_LOG(ERR, POWER,
 647                                 "Failed to set frequency of lcore %u to max\n",
 648                                 lcore_id);
 649                         return -1;
 650                 }
 651         }
 652
 653         return 0;
 654 }