lib/librte_power/power_pstate_cpufreq.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2018 Intel Corporation
   3  */
   4
   5 #include <stdio.h>
   6 #include <sys/types.h>
   7 #include <sys/stat.h>
   8 #include <fcntl.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <unistd.h>
  12 #include <signal.h>
  13 #include <limits.h>
  14 #include <errno.h>
  15 #include <inttypes.h>
  16
  17 #include <rte_memcpy.h>
  18 #include <rte_memory.h>
  19 #include <rte_string_fns.h>
  20
  21 #include "power_pstate_cpufreq.h"
  22 #include "power_common.h"
  23
  24
  25 #ifdef RTE_LIBRTE_POWER_DEBUG
  26 #define POWER_DEBUG_TRACE(fmt, args...) do { \
  27                 RTE_LOG(ERR, POWER, "%s: " fmt, __func__, ## args); \
  28 } while (0)
  29 #else
  30 #define POWER_DEBUG_TRACE(fmt, args...)
  31 #endif
  32
  33 #define FOPEN_OR_ERR_RET(f, retval) do { \
  34                 if ((f) == NULL) { \
  35                         RTE_LOG(ERR, POWER, "File not opened\n"); \
  36                         return retval; \
  37                 } \
  38 } while (0)
  39
  40 #define FOPS_OR_NULL_GOTO(ret, label) do { \
  41                 if ((ret) == NULL) { \
  42                         RTE_LOG(ERR, POWER, "fgets returns nothing\n"); \
  43                         goto label; \
  44                 } \
  45 } while (0)
  46
  47 #define FOPS_OR_ERR_GOTO(ret, label) do { \
  48                 if ((ret) < 0) { \
  49                         RTE_LOG(ERR, POWER, "File operations failed\n"); \
  50                         goto label; \
  51                 } \
  52 } while (0)
  53
  54 /* macros used for rounding frequency to nearest 100000 */
  55 #define FREQ_ROUNDING_DELTA 50000
  56 #define ROUND_FREQ_TO_N_100000 100000
  57
  58 #define POWER_CONVERT_TO_DECIMAL 10
  59 #define BUS_FREQ     100000
  60
  61 #define POWER_GOVERNOR_PERF "performance"
  62 #define POWER_SYSFILE_GOVERNOR  \
  63                 "/sys/devices/system/cpu/cpu%u/cpufreq/scaling_governor"
  64 #define POWER_SYSFILE_MAX_FREQ \
  65                 "/sys/devices/system/cpu/cpu%u/cpufreq/scaling_max_freq"
  66 #define POWER_SYSFILE_MIN_FREQ  \
  67                 "/sys/devices/system/cpu/cpu%u/cpufreq/scaling_min_freq"
  68 #define POWER_SYSFILE_CUR_FREQ  \
  69                 "/sys/devices/system/cpu/cpu%u/cpufreq/scaling_cur_freq"
  70 #define POWER_SYSFILE_BASE_MAX_FREQ \
  71                 "/sys/devices/system/cpu/cpu%u/cpufreq/cpuinfo_max_freq"
  72 #define POWER_SYSFILE_BASE_MIN_FREQ  \
  73                 "/sys/devices/system/cpu/cpu%u/cpufreq/cpuinfo_min_freq"
  74 #define POWER_SYSFILE_BASE_FREQ  \
  75                 "/sys/devices/system/cpu/cpu%u/cpufreq/base_frequency"
  76 #define POWER_PSTATE_DRIVER "intel_pstate"
  77 #define POWER_MSR_PATH  "/dev/cpu/%u/msr"
  78
  79 /*
  80  * MSR related
  81  */
  82 #define PLATFORM_INFO     0x0CE
  83 #define NON_TURBO_MASK    0xFF00
  84 #define NON_TURBO_OFFSET  0x8
  85
  86
  87 enum power_state {
  88         POWER_IDLE = 0,
  89         POWER_ONGOING,
  90         POWER_USED,
  91         POWER_UNKNOWN
  92 };
  93
  94 struct pstate_power_info {
  95         unsigned int lcore_id;               /**< Logical core id */
  96         uint32_t freqs[RTE_MAX_LCORE_FREQS]; /**< Frequency array */
  97         uint32_t nb_freqs;                   /**< number of available freqs */
  98         FILE *f_cur_min;                     /**< FD of scaling_min */
  99         FILE *f_cur_max;                     /**< FD of scaling_max */
 100         char governor_ori[32];               /**< Original governor name */
 101         uint32_t curr_idx;                   /**< Freq index in freqs array */
 102         uint32_t non_turbo_max_ratio;        /**< Non Turbo Max ratio  */
 103         uint32_t sys_max_freq;               /**< system wide max freq  */
 104         uint32_t core_base_freq;             /**< core base freq  */
 105         uint32_t state;                      /**< Power in use state */
 106         uint16_t turbo_available;            /**< Turbo Boost available */
 107         uint16_t turbo_enable;               /**< Turbo Boost enable/disable */
 108         uint16_t priority_core;              /**< High Performance core */
 109 } __rte_cache_aligned;
 110
 111
 112 static struct pstate_power_info lcore_power_info[RTE_MAX_LCORE];
 113
 114 /**
 115  * It is to read the specific MSR.
 116  */
 117
 118 static int32_t
 119 power_rdmsr(int msr, uint64_t *val, unsigned int lcore_id)
 120 {
 121         int fd, ret;
 122         char fullpath[PATH_MAX];
 123
 124         snprintf(fullpath, sizeof(fullpath), POWER_MSR_PATH, lcore_id);
 125
 126         fd = open(fullpath, O_RDONLY);
 127
 128         if (fd < 0) {
 129                 RTE_LOG(ERR, POWER, "Error opening '%s': %s\n", fullpath,
 130                                  strerror(errno));
 131                 return fd;
 132         }
 133
 134         ret = pread(fd, val, sizeof(uint64_t), msr);
 135
 136         if (ret < 0) {
 137                 RTE_LOG(ERR, POWER, "Error reading '%s': %s\n", fullpath,
 138                                  strerror(errno));
 139                 goto out;
 140         }
 141
 142         POWER_DEBUG_TRACE("MSR Path %s, offset 0x%X for lcore %u\n",
 143                         fullpath, msr, lcore_id);
 144
 145         POWER_DEBUG_TRACE("Ret value %d, content is 0x%"PRIx64"\n", ret, *val);
 146
 147 out:    close(fd);
 148         return ret;
 149 }
 150
 151 /**
 152  * It is to fopen the sys file for the future setting the lcore frequency.
 153  */
 154 static int
 155 power_init_for_setting_freq(struct pstate_power_info *pi)
 156 {
 157         FILE *f_min, *f_max, *f_base = NULL, *f_base_max;
 158         char fullpath_min[PATH_MAX];
 159         char fullpath_max[PATH_MAX];
 160         char fullpath_base[PATH_MAX];
 161         char fullpath_base_max[PATH_MAX];
 162         char buf_base[BUFSIZ];
 163         char *s_base;
 164         char *s_base_max;
 165         uint32_t base_ratio = 0;
 166         uint32_t base_max_ratio = 0;
 167         uint64_t max_non_turbo = 0;
 168         int  ret_val = 0;
 169
 170         snprintf(fullpath_base_max,
 171                         sizeof(fullpath_base_max),
 172                         POWER_SYSFILE_BASE_MAX_FREQ,
 173                         pi->lcore_id);
 174         f_base_max = fopen(fullpath_base_max, "r");
 175         FOPEN_OR_ERR_RET(f_base_max, -1);
 176         if (f_base_max != NULL) {
 177                 s_base_max = fgets(buf_base, sizeof(buf_base), f_base_max);
 178                 FOPS_OR_NULL_GOTO(s_base_max, out);
 179
 180                 buf_base[BUFSIZ-1] = '\0';
 181                 if (strlen(buf_base))
 182                         /* Strip off terminating '\n' */
 183                         strtok(buf_base, "\n");
 184
 185                 base_max_ratio =
 186                         strtoul(buf_base, NULL, POWER_CONVERT_TO_DECIMAL)
 187                                 / BUS_FREQ;
 188         }
 189
 190         snprintf(fullpath_min, sizeof(fullpath_min), POWER_SYSFILE_MIN_FREQ,
 191                         pi->lcore_id);
 192         f_min = fopen(fullpath_min, "rw+");
 193         FOPEN_OR_ERR_RET(f_min, -1);
 194
 195         snprintf(fullpath_max, sizeof(fullpath_max), POWER_SYSFILE_MAX_FREQ,
 196                         pi->lcore_id);
 197         f_max = fopen(fullpath_max, "rw+");
 198         if (f_max == NULL)
 199                 fclose(f_min);
 200         FOPEN_OR_ERR_RET(f_max, -1);
 201
 202         pi->f_cur_min = f_min;
 203         pi->f_cur_max = f_max;
 204
 205         snprintf(fullpath_base, sizeof(fullpath_base), POWER_SYSFILE_BASE_FREQ,
 206                         pi->lcore_id);
 207
 208         f_base = fopen(fullpath_base, "r");
 209         if (f_base == NULL) {
 210                 /* No sysfs base_frequency, that's OK, continue without */
 211                 base_ratio = 0;
 212         } else {
 213                 s_base = fgets(buf_base, sizeof(buf_base), f_base);
 214                 FOPS_OR_NULL_GOTO(s_base, out);
 215
 216                 buf_base[BUFSIZ-1] = '\0';
 217                 if (strlen(buf_base))
 218                         /* Strip off terminating '\n' */
 219                         strtok(buf_base, "\n");
 220
 221                 base_ratio = strtoul(buf_base, NULL, POWER_CONVERT_TO_DECIMAL)
 222                                 / BUS_FREQ;
 223                 fclose(f_base);
 224         }
 225
 226         /* Add MSR read to detect turbo status */
 227
 228         if (power_rdmsr(PLATFORM_INFO, &max_non_turbo, pi->lcore_id) < 0) {
 229                 ret_val = -1;
 230                 goto out;
 231         }
 232
 233         max_non_turbo = (max_non_turbo&NON_TURBO_MASK)>>NON_TURBO_OFFSET;
 234
 235         POWER_DEBUG_TRACE("no turbo perf %"PRIu64"\n", max_non_turbo);
 236
 237         pi->non_turbo_max_ratio = max_non_turbo;
 238
 239         /*
 240          * If base_frequency is reported as greater than the maximum
 241          * turbo frequency, that's a known issue with some kernels.
 242          * Set base_frequency to max_non_turbo as a workaround.
 243          */
 244         if (base_ratio > base_max_ratio) {
 245                 /* base_ratio is greater than max turbo. Kernel bug. */
 246                 pi->priority_core = 0;
 247                 goto out;
 248         }
 249
 250         /*
 251          * If base_frequency is reported as greater than the maximum
 252          * non-turbo frequency, then mark it as a high priority core.
 253          */
 254         if (base_ratio > max_non_turbo)
 255                 pi->priority_core = 1;
 256         else
 257                 pi->priority_core = 0;
 258         pi->core_base_freq = base_ratio * BUS_FREQ;
 259
 260 out:
 261         if (f_base != NULL)
 262                 fclose(f_base);
 263         return ret_val;
 264 }
 265
 266 static int
 267 set_freq_internal(struct pstate_power_info *pi, uint32_t idx)
 268 {
 269         uint32_t target_freq = 0;
 270
 271         if (idx >= RTE_MAX_LCORE_FREQS || idx >= pi->nb_freqs) {
 272                 RTE_LOG(ERR, POWER, "Invalid frequency index %u, which "
 273                                 "should be less than %u\n", idx, pi->nb_freqs);
 274                 return -1;
 275         }
 276
 277         /* Check if it is the same as current */
 278         if (idx == pi->curr_idx)
 279                 return 0;
 280
 281         /* Because Intel Pstate Driver only allow user change min/max hint
 282          * User need change the min/max as same value.
 283          */
 284         if (fseek(pi->f_cur_min, 0, SEEK_SET) < 0) {
 285                 RTE_LOG(ERR, POWER, "Fail to set file position indicator to 0 "
 286                                 "for setting frequency for lcore %u\n",
 287                                 pi->lcore_id);
 288                 return -1;
 289         }
 290
 291         if (fseek(pi->f_cur_max, 0, SEEK_SET) < 0) {
 292                 RTE_LOG(ERR, POWER, "Fail to set file position indicator to 0 "
 293                                 "for setting frequency for lcore %u\n",
 294                                 pi->lcore_id);
 295                 return -1;
 296         }
 297
 298         /* Turbo is available and enabled, first freq bucket is sys max freq */
 299         if (pi->turbo_available && idx == 0) {
 300                 if (pi->turbo_enable)
 301                         target_freq = pi->sys_max_freq;
 302                 else {
 303                         RTE_LOG(ERR, POWER, "Turbo is off, frequency can't be scaled up more %u\n",
 304                                         pi->lcore_id);
 305                         return -1;
 306                 }
 307         } else
 308                 target_freq = pi->freqs[idx];
 309
 310         /* Decrease freq, the min freq should be updated first */
 311         if (idx  >  pi->curr_idx) {
 312
 313                 if (fprintf(pi->f_cur_min, "%u", target_freq) < 0) {
 314                         RTE_LOG(ERR, POWER, "Fail to write new frequency for "
 315                                         "lcore %u\n", pi->lcore_id);
 316                         return -1;
 317                 }
 318
 319                 if (fprintf(pi->f_cur_max, "%u", target_freq) < 0) {
 320                         RTE_LOG(ERR, POWER, "Fail to write new frequency for "
 321                                         "lcore %u\n", pi->lcore_id);
 322                         return -1;
 323                 }
 324
 325                 POWER_DEBUG_TRACE("Frequency '%u' to be set for lcore %u\n",
 326                                   target_freq, pi->lcore_id);
 327
 328                 fflush(pi->f_cur_min);
 329                 fflush(pi->f_cur_max);
 330
 331         }
 332
 333         /* Increase freq, the max freq should be updated first */
 334         if (idx  <  pi->curr_idx) {
 335
 336                 if (fprintf(pi->f_cur_max, "%u", target_freq) < 0) {
 337                         RTE_LOG(ERR, POWER, "Fail to write new frequency for "
 338                                         "lcore %u\n", pi->lcore_id);
 339                         return -1;
 340                 }
 341
 342                 if (fprintf(pi->f_cur_min, "%u", target_freq) < 0) {
 343                         RTE_LOG(ERR, POWER, "Fail to write new frequency for "
 344                                         "lcore %u\n", pi->lcore_id);
 345                         return -1;
 346                 }
 347
 348                 POWER_DEBUG_TRACE("Frequency '%u' to be set for lcore %u\n",
 349                                   target_freq, pi->lcore_id);
 350
 351                 fflush(pi->f_cur_max);
 352                 fflush(pi->f_cur_min);
 353         }
 354
 355         pi->curr_idx = idx;
 356
 357         return 1;
 358 }
 359
 360 /**
 361  * It is to check the current scaling governor by reading sys file, and then
 362  * set it into 'performance' if it is not by writing the sys file. The original
 363  * governor will be saved for rolling back.
 364  */
 365 static int
 366 power_set_governor_performance(struct pstate_power_info *pi)
 367 {
 368         FILE *f;
 369         int ret = -1;
 370         char buf[BUFSIZ];
 371         char fullpath[PATH_MAX];
 372         char *s;
 373         int val;
 374
 375         snprintf(fullpath, sizeof(fullpath), POWER_SYSFILE_GOVERNOR,
 376                         pi->lcore_id);
 377         f = fopen(fullpath, "rw+");
 378         FOPEN_OR_ERR_RET(f, ret);
 379
 380         s = fgets(buf, sizeof(buf), f);
 381         FOPS_OR_NULL_GOTO(s, out);
 382         /* Strip off terminating '\n' */
 383         strtok(buf, "\n");
 384
 385         /* Check if current governor is performance */
 386         if (strncmp(buf, POWER_GOVERNOR_PERF,
 387                         sizeof(POWER_GOVERNOR_PERF)) == 0) {
 388                 ret = 0;
 389                 POWER_DEBUG_TRACE("Power management governor of lcore %u is "
 390                                 "already performance\n", pi->lcore_id);
 391                 goto out;
 392         }
 393         /* Save the original governor */
 394         strlcpy(pi->governor_ori, buf, sizeof(pi->governor_ori));
 395
 396         /* Write 'performance' to the governor */
 397         val = fseek(f, 0, SEEK_SET);
 398         FOPS_OR_ERR_GOTO(val, out);
 399
 400         val = fputs(POWER_GOVERNOR_PERF, f);
 401         FOPS_OR_ERR_GOTO(val, out);
 402
 403         /* We need to flush to see if the fputs succeeds */
 404         val = fflush(f);
 405         FOPS_OR_ERR_GOTO(val, out);
 406
 407         ret = 0;
 408         RTE_LOG(INFO, POWER, "Power management governor of lcore %u has been "
 409                         "set to performance successfully\n", pi->lcore_id);
 410 out:
 411         fclose(f);
 412
 413         return ret;
 414 }
 415
 416 /**
 417  * It is to check the governor and then set the original governor back if
 418  * needed by writing the sys file.
 419  */
 420 static int
 421 power_set_governor_original(struct pstate_power_info *pi)
 422 {
 423         FILE *f;
 424         int ret = -1;
 425         char buf[BUFSIZ];
 426         char fullpath[PATH_MAX];
 427         char *s;
 428         int val;
 429
 430         snprintf(fullpath, sizeof(fullpath), POWER_SYSFILE_GOVERNOR,
 431                         pi->lcore_id);
 432         f = fopen(fullpath, "rw+");
 433         FOPEN_OR_ERR_RET(f, ret);
 434
 435         s = fgets(buf, sizeof(buf), f);
 436         FOPS_OR_NULL_GOTO(s, out);
 437
 438         /* Check if the governor to be set is the same as current */
 439         if (strncmp(buf, pi->governor_ori, sizeof(pi->governor_ori)) == 0) {
 440                 ret = 0;
 441                 POWER_DEBUG_TRACE("Power management governor of lcore %u "
 442                                 "has already been set to %s\n",
 443                                 pi->lcore_id, pi->governor_ori);
 444                 goto out;
 445         }
 446
 447         /* Write back the original governor */
 448         val = fseek(f, 0, SEEK_SET);
 449         FOPS_OR_ERR_GOTO(val, out);
 450
 451         val = fputs(pi->governor_ori, f);
 452         FOPS_OR_ERR_GOTO(val, out);
 453
 454         ret = 0;
 455         RTE_LOG(INFO, POWER, "Power management governor of lcore %u "
 456                         "has been set back to %s successfully\n",
 457                         pi->lcore_id, pi->governor_ori);
 458 out:
 459         fclose(f);
 460
 461         return ret;
 462 }
 463
 464 /**
 465  * It is to get the available frequencies of the specific lcore by reading the
 466  * sys file.
 467  */
 468 static int
 469 power_get_available_freqs(struct pstate_power_info *pi)
 470 {
 471         FILE *f_min, *f_max;
 472         int ret = -1;
 473         char *p_min, *p_max;
 474         char buf_min[BUFSIZ];
 475         char buf_max[BUFSIZ];
 476         char fullpath_min[PATH_MAX];
 477         char fullpath_max[PATH_MAX];
 478         char *s_min, *s_max;
 479         uint32_t sys_min_freq = 0, sys_max_freq = 0, base_max_freq = 0;
 480         uint32_t i, num_freqs = 0;
 481
 482         snprintf(fullpath_max, sizeof(fullpath_max),
 483                         POWER_SYSFILE_BASE_MAX_FREQ,
 484                         pi->lcore_id);
 485         snprintf(fullpath_min, sizeof(fullpath_min),
 486                         POWER_SYSFILE_BASE_MIN_FREQ,
 487                         pi->lcore_id);
 488
 489         f_min = fopen(fullpath_min, "r");
 490         FOPEN_OR_ERR_RET(f_min, ret);
 491
 492         f_max = fopen(fullpath_max, "r");
 493         if (f_max == NULL)
 494                 fclose(f_min);
 495
 496         FOPEN_OR_ERR_RET(f_max, ret);
 497
 498         s_min = fgets(buf_min, sizeof(buf_min), f_min);
 499         FOPS_OR_NULL_GOTO(s_min, out);
 500
 501         s_max = fgets(buf_max, sizeof(buf_max), f_max);
 502         FOPS_OR_NULL_GOTO(s_max, out);
 503
 504
 505         /* Strip the line break if there is */
 506         p_min = strchr(buf_min, '\n');
 507         if (p_min != NULL)
 508                 *p_min = 0;
 509
 510         p_max = strchr(buf_max, '\n');
 511         if (p_max != NULL)
 512                 *p_max = 0;
 513
 514         sys_min_freq = strtoul(buf_min, &p_min, POWER_CONVERT_TO_DECIMAL);
 515         sys_max_freq = strtoul(buf_max, &p_max, POWER_CONVERT_TO_DECIMAL);
 516
 517         if (sys_max_freq < sys_min_freq)
 518                 goto out;
 519
 520         pi->sys_max_freq = sys_max_freq;
 521
 522         if (pi->priority_core == 1)
 523                 base_max_freq = pi->core_base_freq;
 524         else
 525                 base_max_freq = pi->non_turbo_max_ratio * BUS_FREQ;
 526
 527         POWER_DEBUG_TRACE("sys min %u, sys max %u, base_max %u\n",
 528                         sys_min_freq,
 529                         sys_max_freq,
 530                         base_max_freq);
 531
 532         if (base_max_freq < sys_max_freq)
 533                 pi->turbo_available = 1;
 534         else
 535                 pi->turbo_available = 0;
 536
 537         /* If turbo is available then there is one extra freq bucket
 538          * to store the sys max freq which value is base_max +1
 539          */
 540         num_freqs = (base_max_freq - sys_min_freq) / BUS_FREQ + 1 +
 541                 pi->turbo_available;
 542
 543         /* Generate the freq bucket array.
 544          * If turbo is available the freq bucket[0] value is base_max +1
 545          * the bucket[1] is base_max, bucket[2] is base_max - BUS_FREQ
 546          * and so on.
 547          * If turbo is not available bucket[0] is base_max and so on
 548          */
 549         for (i = 0, pi->nb_freqs = 0; i < num_freqs; i++) {
 550                 if ((i == 0) && pi->turbo_available)
 551                         pi->freqs[pi->nb_freqs++] = base_max_freq + 1;
 552                 else
 553                         pi->freqs[pi->nb_freqs++] =
 554                         base_max_freq - (i - pi->turbo_available) * BUS_FREQ;
 555         }
 556
 557         ret = 0;
 558
 559         POWER_DEBUG_TRACE("%d frequency(s) of lcore %u are available\n",
 560                         num_freqs, pi->lcore_id);
 561
 562 out:
 563         fclose(f_min);
 564         fclose(f_max);
 565
 566         return ret;
 567 }
 568
 569 static int
 570 power_get_cur_idx(struct pstate_power_info *pi)
 571 {
 572         FILE *f_cur;
 573         int ret = -1;
 574         char *p_cur;
 575         char buf_cur[BUFSIZ];
 576         char fullpath_cur[PATH_MAX];
 577         char *s_cur;
 578         uint32_t sys_cur_freq = 0;
 579         unsigned int i;
 580
 581         snprintf(fullpath_cur, sizeof(fullpath_cur),
 582                         POWER_SYSFILE_CUR_FREQ,
 583                         pi->lcore_id);
 584         f_cur = fopen(fullpath_cur, "r");
 585         FOPEN_OR_ERR_RET(f_cur, ret);
 586
 587         /* initialize the cur_idx to matching current frequency freq index */
 588         s_cur = fgets(buf_cur, sizeof(buf_cur), f_cur);
 589         FOPS_OR_NULL_GOTO(s_cur, fail);
 590
 591         p_cur = strchr(buf_cur, '\n');
 592         if (p_cur != NULL)
 593                 *p_cur = 0;
 594         sys_cur_freq = strtoul(buf_cur, &p_cur, POWER_CONVERT_TO_DECIMAL);
 595
 596         /* convert the frequency to nearest 100000 value
 597          * Ex: if sys_cur_freq=1396789 then freq_conv=1400000
 598          * Ex: if sys_cur_freq=800030 then freq_conv=800000
 599          * Ex: if sys_cur_freq=800030 then freq_conv=800000
 600          */
 601         unsigned int freq_conv = 0;
 602         freq_conv = (sys_cur_freq + FREQ_ROUNDING_DELTA)
 603                                 / ROUND_FREQ_TO_N_100000;
 604         freq_conv = freq_conv * ROUND_FREQ_TO_N_100000;
 605
 606         for (i = 0; i < pi->nb_freqs; i++) {
 607                 if (freq_conv == pi->freqs[i]) {
 608                         pi->curr_idx = i;
 609                         break;
 610                 }
 611         }
 612
 613         fclose(f_cur);
 614         return 0;
 615 fail:
 616         fclose(f_cur);
 617         return ret;
 618 }
 619
 620 int
 621 power_pstate_cpufreq_check_supported(void)
 622 {
 623         return cpufreq_check_scaling_driver(POWER_PSTATE_DRIVER);
 624 }
 625
 626 int
 627 power_pstate_cpufreq_init(unsigned int lcore_id)
 628 {
 629         struct pstate_power_info *pi;
 630         uint32_t exp_state;
 631
 632         if (lcore_id >= RTE_MAX_LCORE) {
 633                 RTE_LOG(ERR, POWER, "Lcore id %u can not exceed %u\n",
 634                                 lcore_id, RTE_MAX_LCORE - 1U);
 635                 return -1;
 636         }
 637
 638         pi = &lcore_power_info[lcore_id];
 639         exp_state = POWER_IDLE;
 640         /* The power in use state works as a guard variable between
 641          * the CPU frequency control initialization and exit process.
 642          * The ACQUIRE memory ordering here pairs with the RELEASE
 643          * ordering below as lock to make sure the frequency operations
 644          * in the critical section are done under the correct state.
 645          */
 646         if (!__atomic_compare_exchange_n(&(pi->state), &exp_state,
 647                                         POWER_ONGOING, 0,
 648                                         __ATOMIC_ACQUIRE, __ATOMIC_RELAXED)) {
 649                 RTE_LOG(INFO, POWER, "Power management of lcore %u is "
 650                                 "in use\n", lcore_id);
 651                 return -1;
 652         }
 653
 654         pi->lcore_id = lcore_id;
 655         /* Check and set the governor */
 656         if (power_set_governor_performance(pi) < 0) {
 657                 RTE_LOG(ERR, POWER, "Cannot set governor of lcore %u to "
 658                                 "performance\n", lcore_id);
 659                 goto fail;
 660         }
 661         /* Init for setting lcore frequency */
 662         if (power_init_for_setting_freq(pi) < 0) {
 663                 RTE_LOG(ERR, POWER, "Cannot init for setting frequency for "
 664                                 "lcore %u\n", lcore_id);
 665                 goto fail;
 666         }
 667
 668         /* Get the available frequencies */
 669         if (power_get_available_freqs(pi) < 0) {
 670                 RTE_LOG(ERR, POWER, "Cannot get available frequencies of "
 671                                 "lcore %u\n", lcore_id);
 672                 goto fail;
 673         }
 674
 675         if (power_get_cur_idx(pi) < 0) {
 676                 RTE_LOG(ERR, POWER, "Cannot get current frequency "
 677                                 "index of lcore %u\n", lcore_id);
 678                 goto fail;
 679         }
 680
 681         /* Set freq to max by default */
 682         if (power_pstate_cpufreq_freq_max(lcore_id) < 0) {
 683                 RTE_LOG(ERR, POWER, "Cannot set frequency of lcore %u "
 684                                 "to max\n", lcore_id);
 685                 goto fail;
 686         }
 687
 688         RTE_LOG(INFO, POWER, "Initialized successfully for lcore %u "
 689                         "power management\n", lcore_id);
 690         exp_state = POWER_ONGOING;
 691         __atomic_compare_exchange_n(&(pi->state), &exp_state, POWER_USED,
 692                                     0, __ATOMIC_RELEASE, __ATOMIC_RELAXED);
 693
 694         return 0;
 695
 696 fail:
 697         exp_state = POWER_ONGOING;
 698         __atomic_compare_exchange_n(&(pi->state), &exp_state, POWER_UNKNOWN,
 699                                     0, __ATOMIC_RELEASE, __ATOMIC_RELAXED);
 700
 701         return -1;
 702 }
 703
 704 int
 705 power_pstate_cpufreq_exit(unsigned int lcore_id)
 706 {
 707         struct pstate_power_info *pi;
 708         uint32_t exp_state;
 709
 710         if (lcore_id >= RTE_MAX_LCORE) {
 711                 RTE_LOG(ERR, POWER, "Lcore id %u can not exceeds %u\n",
 712                                 lcore_id, RTE_MAX_LCORE - 1U);
 713                 return -1;
 714         }
 715         pi = &lcore_power_info[lcore_id];
 716
 717         exp_state = POWER_USED;
 718         /* The power in use state works as a guard variable between
 719          * the CPU frequency control initialization and exit process.
 720          * The ACQUIRE memory ordering here pairs with the RELEASE
 721          * ordering below as lock to make sure the frequency operations
 722          * in the critical section are under done the correct state.
 723          */
 724         if (!__atomic_compare_exchange_n(&(pi->state), &exp_state,
 725                                         POWER_ONGOING, 0,
 726                                         __ATOMIC_ACQUIRE, __ATOMIC_RELAXED)) {
 727                 RTE_LOG(INFO, POWER, "Power management of lcore %u is "
 728                                 "not used\n", lcore_id);
 729                 return -1;
 730         }
 731
 732         /* Close FD of setting freq */
 733         fclose(pi->f_cur_min);
 734         fclose(pi->f_cur_max);
 735         pi->f_cur_min = NULL;
 736         pi->f_cur_max = NULL;
 737
 738         /* Set the governor back to the original */
 739         if (power_set_governor_original(pi) < 0) {
 740                 RTE_LOG(ERR, POWER, "Cannot set the governor of %u back "
 741                                 "to the original\n", lcore_id);
 742                 goto fail;
 743         }
 744
 745         RTE_LOG(INFO, POWER, "Power management of lcore %u has exited from "
 746                         "'performance' mode and been set back to the "
 747                         "original\n", lcore_id);
 748         exp_state = POWER_ONGOING;
 749         __atomic_compare_exchange_n(&(pi->state), &exp_state, POWER_IDLE,
 750                                     0, __ATOMIC_RELEASE, __ATOMIC_RELAXED);
 751
 752         return 0;
 753
 754 fail:
 755         exp_state = POWER_ONGOING;
 756         __atomic_compare_exchange_n(&(pi->state), &exp_state, POWER_UNKNOWN,
 757                                     0, __ATOMIC_RELEASE, __ATOMIC_RELAXED);
 758
 759         return -1;
 760 }
 761
 762
 763 uint32_t
 764 power_pstate_cpufreq_freqs(unsigned int lcore_id, uint32_t *freqs, uint32_t num)
 765 {
 766         struct pstate_power_info *pi;
 767
 768         if (lcore_id >= RTE_MAX_LCORE) {
 769                 RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
 770                 return 0;
 771         }
 772
 773         if (freqs == NULL) {
 774                 RTE_LOG(ERR, POWER, "NULL buffer supplied\n");
 775                 return 0;
 776         }
 777
 778         pi = &lcore_power_info[lcore_id];
 779         if (num < pi->nb_freqs) {
 780                 RTE_LOG(ERR, POWER, "Buffer size is not enough\n");
 781                 return 0;
 782         }
 783         rte_memcpy(freqs, pi->freqs, pi->nb_freqs * sizeof(uint32_t));
 784
 785         return pi->nb_freqs;
 786 }
 787
 788 uint32_t
 789 power_pstate_cpufreq_get_freq(unsigned int lcore_id)
 790 {
 791         if (lcore_id >= RTE_MAX_LCORE) {
 792                 RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
 793                 return RTE_POWER_INVALID_FREQ_INDEX;
 794         }
 795
 796         return lcore_power_info[lcore_id].curr_idx;
 797 }
 798
 799
 800 int
 801 power_pstate_cpufreq_set_freq(unsigned int lcore_id, uint32_t index)
 802 {
 803         if (lcore_id >= RTE_MAX_LCORE) {
 804                 RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
 805                 return -1;
 806         }
 807
 808         return set_freq_internal(&(lcore_power_info[lcore_id]), index);
 809 }
 810
 811 int
 812 power_pstate_cpufreq_freq_up(unsigned int lcore_id)
 813 {
 814         struct pstate_power_info *pi;
 815
 816         if (lcore_id >= RTE_MAX_LCORE) {
 817                 RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
 818                 return -1;
 819         }
 820
 821         pi = &lcore_power_info[lcore_id];
 822         if (pi->curr_idx == 0 ||
 823             (pi->curr_idx == 1 && pi->turbo_available && !pi->turbo_enable))
 824                 return 0;
 825
 826         /* Frequencies in the array are from high to low. */
 827         return set_freq_internal(pi, pi->curr_idx - 1);
 828 }
 829
 830 int
 831 power_pstate_cpufreq_freq_down(unsigned int lcore_id)
 832 {
 833         struct pstate_power_info *pi;
 834
 835         if (lcore_id >= RTE_MAX_LCORE) {
 836                 RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
 837                 return -1;
 838         }
 839
 840         pi = &lcore_power_info[lcore_id];
 841         if (pi->curr_idx + 1 == pi->nb_freqs)
 842                 return 0;
 843
 844         /* Frequencies in the array are from high to low. */
 845         return set_freq_internal(pi, pi->curr_idx + 1);
 846 }
 847
 848 int
 849 power_pstate_cpufreq_freq_max(unsigned int lcore_id)
 850 {
 851         if (lcore_id >= RTE_MAX_LCORE) {
 852                 RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
 853                 return -1;
 854         }
 855
 856         /* Frequencies in the array are from high to low. */
 857         if (lcore_power_info[lcore_id].turbo_available) {
 858                 if (lcore_power_info[lcore_id].turbo_enable)
 859                         /* Set to Turbo */
 860                         return set_freq_internal(
 861                                         &lcore_power_info[lcore_id], 0);
 862                 else
 863                         /* Set to max non-turbo */
 864                         return set_freq_internal(
 865                                         &lcore_power_info[lcore_id], 1);
 866         } else
 867                 return set_freq_internal(&lcore_power_info[lcore_id], 0);
 868 }
 869
 870
 871 int
 872 power_pstate_cpufreq_freq_min(unsigned int lcore_id)
 873 {
 874         struct pstate_power_info *pi;
 875
 876         if (lcore_id >= RTE_MAX_LCORE) {
 877                 RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
 878                 return -1;
 879         }
 880
 881         pi = &lcore_power_info[lcore_id];
 882
 883         /* Frequencies in the array are from high to low. */
 884         return set_freq_internal(pi, pi->nb_freqs - 1);
 885 }
 886
 887
 888 int
 889 power_pstate_turbo_status(unsigned int lcore_id)
 890 {
 891         struct pstate_power_info *pi;
 892
 893         if (lcore_id >= RTE_MAX_LCORE) {
 894                 RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
 895                 return -1;
 896         }
 897
 898         pi = &lcore_power_info[lcore_id];
 899
 900         return pi->turbo_enable;
 901 }
 902
 903 int
 904 power_pstate_enable_turbo(unsigned int lcore_id)
 905 {
 906         struct pstate_power_info *pi;
 907
 908         if (lcore_id >= RTE_MAX_LCORE) {
 909                 RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
 910                 return -1;
 911         }
 912
 913         pi = &lcore_power_info[lcore_id];
 914
 915         if (pi->turbo_available)
 916                 pi->turbo_enable = 1;
 917         else {
 918                 pi->turbo_enable = 0;
 919                 RTE_LOG(ERR, POWER,
 920                         "Failed to enable turbo on lcore %u\n",
 921                         lcore_id);
 922                         return -1;
 923         }
 924
 925         return 0;
 926 }
 927
 928
 929 int
 930 power_pstate_disable_turbo(unsigned int lcore_id)
 931 {
 932         struct pstate_power_info *pi;
 933
 934         if (lcore_id >= RTE_MAX_LCORE) {
 935                 RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
 936                 return -1;
 937         }
 938
 939         pi = &lcore_power_info[lcore_id];
 940
 941         pi->turbo_enable = 0;
 942
 943         if (pi->turbo_available && pi->curr_idx <= 1) {
 944                 /* Try to set freq to max by default coming out of turbo */
 945                 if (power_pstate_cpufreq_freq_max(lcore_id) < 0) {
 946                         RTE_LOG(ERR, POWER,
 947                                 "Failed to set frequency of lcore %u to max\n",
 948                                 lcore_id);
 949                         return -1;
 950                 }
 951         }
 952
 953         return 0;
 954 }
 955
 956
 957 int power_pstate_get_capabilities(unsigned int lcore_id,
 958                 struct rte_power_core_capabilities *caps)
 959 {
 960         struct pstate_power_info *pi;
 961
 962         if (lcore_id >= RTE_MAX_LCORE) {
 963                 RTE_LOG(ERR, POWER, "Invalid lcore ID\n");
 964                 return -1;
 965         }
 966         if (caps == NULL) {
 967                 RTE_LOG(ERR, POWER, "Invalid argument\n");
 968                 return -1;
 969         }
 970
 971         pi = &lcore_power_info[lcore_id];
 972         caps->capabilities = 0;
 973         caps->turbo = !!(pi->turbo_available);
 974         caps->priority = pi->priority_core;
 975
 976         return 0;
 977 }