Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_cpu.c
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1 /*- 2 * Copyright (c) 2004-2005 Nate Lawson (SDG) 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD: releng/5.4/sys/kern/kern_cpu.c 145335 2005-04-20 19:11:07Z cvs2svn $"); 29 30 #include <sys/param.h> 31 #include <sys/bus.h> 32 #include <sys/cpu.h> 33 #include <sys/eventhandler.h> 34 #include <sys/kernel.h> 35 #include <sys/malloc.h> 36 #include <sys/module.h> 37 #include <sys/proc.h> 38 #include <sys/queue.h> 39 #include <sys/sched.h> 40 #include <sys/sysctl.h> 41 #include <sys/systm.h> 42 #include <sys/sbuf.h> 43 #include <sys/timetc.h> 44 45 #include "cpufreq_if.h" 46 47 /* 48 * Common CPU frequency glue code. Drivers for specific hardware can 49 * attach this interface to allow users to get/set the CPU frequency. 50 */ 51 52 /* 53 * Number of levels we can handle. Levels are synthesized from settings 54 * so for M settings and N drivers, there may be M*N levels. 55 */ 56 #define CF_MAX_LEVELS 64 57 58 struct cpufreq_softc { 59 struct cf_level curr_level; 60 int curr_priority; 61 struct cf_level saved_level; 62 int saved_priority; 63 struct cf_level_lst all_levels; 64 int all_count; 65 int max_mhz; 66 device_t dev; 67 struct sysctl_ctx_list sysctl_ctx; 68 }; 69 70 struct cf_setting_array { 71 struct cf_setting sets[MAX_SETTINGS]; 72 int count; 73 TAILQ_ENTRY(cf_setting_array) link; 74 }; 75 76 TAILQ_HEAD(cf_setting_lst, cf_setting_array); 77 78 static int cpufreq_attach(device_t dev); 79 static int cpufreq_detach(device_t dev); 80 static void cpufreq_evaluate(void *arg); 81 static int cf_set_method(device_t dev, const struct cf_level *level, 82 int priority); 83 static int cf_get_method(device_t dev, struct cf_level *level); 84 static int cf_levels_method(device_t dev, struct cf_level *levels, 85 int *count); 86 static int cpufreq_insert_abs(struct cpufreq_softc *sc, 87 struct cf_setting *sets, int count); 88 static int cpufreq_expand_set(struct cpufreq_softc *sc, 89 struct cf_setting_array *set_arr); 90 static struct cf_level *cpufreq_dup_set(struct cpufreq_softc *sc, 91 struct cf_level *dup, struct cf_setting *set); 92 static int cpufreq_curr_sysctl(SYSCTL_HANDLER_ARGS); 93 static int cpufreq_levels_sysctl(SYSCTL_HANDLER_ARGS); 94 static int cpufreq_settings_sysctl(SYSCTL_HANDLER_ARGS); 95 96 static device_method_t cpufreq_methods[] = { 97 DEVMETHOD(device_probe, bus_generic_probe), 98 DEVMETHOD(device_attach, cpufreq_attach), 99 DEVMETHOD(device_detach, cpufreq_detach), 100 101 DEVMETHOD(cpufreq_set, cf_set_method), 102 DEVMETHOD(cpufreq_get, cf_get_method), 103 DEVMETHOD(cpufreq_levels, cf_levels_method), 104 {0, 0} 105 }; 106 static driver_t cpufreq_driver = { 107 "cpufreq", cpufreq_methods, sizeof(struct cpufreq_softc) 108 }; 109 static devclass_t cpufreq_dc; 110 DRIVER_MODULE(cpufreq, cpu, cpufreq_driver, cpufreq_dc, 0, 0); 111 112 static eventhandler_tag cf_ev_tag; 113 114 static int 115 cpufreq_attach(device_t dev) 116 { 117 struct cpufreq_softc *sc; 118 device_t parent; 119 int numdevs; 120 121 sc = device_get_softc(dev); 122 parent = device_get_parent(dev); 123 sc->dev = dev; 124 sysctl_ctx_init(&sc->sysctl_ctx); 125 TAILQ_INIT(&sc->all_levels); 126 sc->curr_level.total_set.freq = CPUFREQ_VAL_UNKNOWN; 127 sc->saved_level.total_set.freq = CPUFREQ_VAL_UNKNOWN; 128 sc->max_mhz = CPUFREQ_VAL_UNKNOWN; 129 130 /* 131 * Only initialize one set of sysctls for all CPUs. In the future, 132 * if multiple CPUs can have different settings, we can move these 133 * sysctls to be under every CPU instead of just the first one. 134 */ 135 numdevs = devclass_get_count(cpufreq_dc); 136 if (numdevs > 1) 137 return (0); 138 139 SYSCTL_ADD_PROC(&sc->sysctl_ctx, 140 SYSCTL_CHILDREN(device_get_sysctl_tree(parent)), 141 OID_AUTO, "freq", CTLTYPE_INT | CTLFLAG_RW, sc, 0, 142 cpufreq_curr_sysctl, "I", "Current CPU frequency"); 143 SYSCTL_ADD_PROC(&sc->sysctl_ctx, 144 SYSCTL_CHILDREN(device_get_sysctl_tree(parent)), 145 OID_AUTO, "freq_levels", CTLTYPE_STRING | CTLFLAG_RD, sc, 0, 146 cpufreq_levels_sysctl, "A", "CPU frequency levels"); 147 cf_ev_tag = EVENTHANDLER_REGISTER(cpufreq_changed, cpufreq_evaluate, 148 NULL, EVENTHANDLER_PRI_ANY); 149 150 return (0); 151 } 152 153 static int 154 cpufreq_detach(device_t dev) 155 { 156 struct cpufreq_softc *sc; 157 int numdevs; 158 159 sc = device_get_softc(dev); 160 sysctl_ctx_free(&sc->sysctl_ctx); 161 162 /* Only clean up these resources when the last device is detaching. */ 163 numdevs = devclass_get_count(cpufreq_dc); 164 if (numdevs == 1) 165 EVENTHANDLER_DEREGISTER(cpufreq_changed, cf_ev_tag); 166 167 return (0); 168 } 169 170 static void 171 cpufreq_evaluate(void *arg) 172 { 173 /* TODO: Re-evaluate when notified of changes to drivers. */ 174 } 175 176 static int 177 cf_set_method(device_t dev, const struct cf_level *level, int priority) 178 { 179 struct cpufreq_softc *sc; 180 const struct cf_setting *set; 181 struct pcpu *pc; 182 int cpu_id, error, i; 183 184 sc = device_get_softc(dev); 185 186 /* 187 * Check that the TSC isn't being used as a timecounter. 188 * If it is, then return EBUSY and refuse to change the 189 * clock speed. 190 */ 191 if (strcmp(timecounter->tc_name, "TSC") == 0) 192 return (EBUSY); 193 194 /* 195 * If the caller didn't specify a level and one is saved, prepare to 196 * restore the saved level. If none has been saved, return an error. 197 * If they did specify one, but the requested level has a lower 198 * priority, don't allow the new level right now. 199 */ 200 if (level == NULL) { 201 if (sc->saved_level.total_set.freq != CPUFREQ_VAL_UNKNOWN) { 202 level = &sc->saved_level; 203 priority = sc->saved_priority; 204 } else 205 return (ENXIO); 206 } else if (priority < sc->curr_priority) 207 return (EPERM); 208 209 /* If already at this level, just return. */ 210 if (CPUFREQ_CMP(sc->curr_level.total_set.freq, level->total_set.freq)) 211 return (0); 212 213 /* First, set the absolute frequency via its driver. */ 214 set = &level->abs_set; 215 if (set->dev) { 216 if (!device_is_attached(set->dev)) { 217 error = ENXIO; 218 goto out; 219 } 220 221 /* Bind to the target CPU before switching, if necessary. */ 222 cpu_id = PCPU_GET(cpuid); 223 pc = cpu_get_pcpu(set->dev); 224 if (cpu_id != pc->pc_cpuid) { 225 mtx_lock_spin(&sched_lock); 226 sched_bind(curthread, pc->pc_cpuid); 227 mtx_unlock_spin(&sched_lock); 228 } 229 error = CPUFREQ_DRV_SET(set->dev, set); 230 if (cpu_id != pc->pc_cpuid) { 231 mtx_lock_spin(&sched_lock); 232 sched_unbind(curthread); 233 mtx_unlock_spin(&sched_lock); 234 } 235 if (error) { 236 goto out; 237 } 238 } 239 240 /* Next, set any/all relative frequencies via their drivers. */ 241 for (i = 0; i < level->rel_count; i++) { 242 set = &level->rel_set[i]; 243 if (!device_is_attached(set->dev)) { 244 error = ENXIO; 245 goto out; 246 } 247 248 /* Bind to the target CPU before switching, if necessary. */ 249 cpu_id = PCPU_GET(cpuid); 250 pc = cpu_get_pcpu(set->dev); 251 if (cpu_id != pc->pc_cpuid) { 252 mtx_lock_spin(&sched_lock); 253 sched_bind(curthread, pc->pc_cpuid); 254 mtx_unlock_spin(&sched_lock); 255 } 256 error = CPUFREQ_DRV_SET(set->dev, set); 257 if (cpu_id != pc->pc_cpuid) { 258 mtx_lock_spin(&sched_lock); 259 sched_unbind(curthread); 260 mtx_unlock_spin(&sched_lock); 261 } 262 if (error) { 263 /* XXX Back out any successful setting? */ 264 goto out; 265 } 266 } 267 268 /* If we were restoring a saved state, reset it to "unused". */ 269 if (level == &sc->saved_level) { 270 sc->saved_level.total_set.freq = CPUFREQ_VAL_UNKNOWN; 271 sc->saved_priority = 0; 272 } 273 274 /* 275 * Before recording the current level, check if we're going to a 276 * higher priority and have not saved a level yet. If so, save the 277 * previous level and priority. 278 */ 279 if (sc->curr_level.total_set.freq != CPUFREQ_VAL_UNKNOWN && 280 sc->saved_level.total_set.freq == CPUFREQ_VAL_UNKNOWN && 281 priority > sc->curr_priority) { 282 sc->saved_level = sc->curr_level; 283 sc->saved_priority = sc->curr_priority; 284 } 285 sc->curr_level = *level; 286 sc->curr_priority = priority; 287 error = 0; 288 289 out: 290 if (error) 291 device_printf(set->dev, "set freq failed, err %d\n", error); 292 return (error); 293 } 294 295 static int 296 cf_get_method(device_t dev, struct cf_level *level) 297 { 298 struct cpufreq_softc *sc; 299 struct cf_level *levels; 300 struct cf_setting *curr_set, set; 301 struct pcpu *pc; 302 device_t *devs; 303 int count, error, i, numdevs; 304 uint64_t rate; 305 306 sc = device_get_softc(dev); 307 curr_set = &sc->curr_level.total_set; 308 levels = NULL; 309 310 /* If we already know the current frequency, we're done. */ 311 if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) 312 goto out; 313 314 /* 315 * We need to figure out the current level. Loop through every 316 * driver, getting the current setting. Then, attempt to get a best 317 * match of settings against each level. 318 */ 319 count = CF_MAX_LEVELS; 320 levels = malloc(count * sizeof(*levels), M_TEMP, M_NOWAIT); 321 if (levels == NULL) 322 return (ENOMEM); 323 error = CPUFREQ_LEVELS(sc->dev, levels, &count); 324 if (error) { 325 if (error == E2BIG) 326 printf("cpufreq: need to increase CF_MAX_LEVELS\n"); 327 goto out; 328 } 329 error = device_get_children(device_get_parent(dev), &devs, &numdevs); 330 if (error) 331 goto out; 332 for (i = 0; i < numdevs && curr_set->freq == CPUFREQ_VAL_UNKNOWN; i++) { 333 if (!device_is_attached(devs[i])) 334 continue; 335 error = CPUFREQ_DRV_GET(devs[i], &set); 336 if (error) 337 continue; 338 for (i = 0; i < count; i++) { 339 if (CPUFREQ_CMP(set.freq, levels[i].total_set.freq)) { 340 sc->curr_level = levels[i]; 341 break; 342 } 343 } 344 } 345 free(devs, M_TEMP); 346 if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) 347 goto out; 348 349 /* 350 * We couldn't find an exact match, so attempt to estimate and then 351 * match against a level. 352 */ 353 pc = cpu_get_pcpu(dev); 354 if (pc == NULL) { 355 error = ENXIO; 356 goto out; 357 } 358 cpu_est_clockrate(pc->pc_cpuid, &rate); 359 rate /= 1000000; 360 for (i = 0; i < count; i++) { 361 if (CPUFREQ_CMP(rate, levels[i].total_set.freq)) { 362 sc->curr_level = levels[i]; 363 break; 364 } 365 } 366 367 out: 368 if (levels) 369 free(levels, M_TEMP); 370 *level = sc->curr_level; 371 return (0); 372 } 373 374 static int 375 cf_levels_method(device_t dev, struct cf_level *levels, int *count) 376 { 377 struct cf_setting_array *set_arr; 378 struct cf_setting_lst rel_sets; 379 struct cpufreq_softc *sc; 380 struct cf_level *lev; 381 struct cf_setting *sets; 382 struct pcpu *pc; 383 device_t *devs; 384 int error, i, numdevs, set_count, type; 385 uint64_t rate; 386 387 if (levels == NULL || count == NULL) 388 return (EINVAL); 389 390 TAILQ_INIT(&rel_sets); 391 sc = device_get_softc(dev); 392 error = device_get_children(device_get_parent(dev), &devs, &numdevs); 393 if (error) 394 return (error); 395 sets = malloc(MAX_SETTINGS * sizeof(*sets), M_TEMP, M_NOWAIT); 396 if (sets == NULL) { 397 free(devs, M_TEMP); 398 return (ENOMEM); 399 } 400 401 /* Get settings from all cpufreq drivers. */ 402 for (i = 0; i < numdevs; i++) { 403 /* Skip devices that aren't ready. */ 404 if (!device_is_attached(devs[i])) 405 continue; 406 407 /* 408 * Get settings, skipping drivers that offer no settings or 409 * provide settings for informational purposes only. 410 */ 411 error = CPUFREQ_DRV_TYPE(devs[i], &type); 412 if (error || (type & CPUFREQ_FLAG_INFO_ONLY)) 413 continue; 414 set_count = MAX_SETTINGS; 415 error = CPUFREQ_DRV_SETTINGS(devs[i], sets, &set_count); 416 if (error || set_count == 0) 417 continue; 418 419 /* Add the settings to our absolute/relative lists. */ 420 switch (type & CPUFREQ_TYPE_MASK) { 421 case CPUFREQ_TYPE_ABSOLUTE: 422 error = cpufreq_insert_abs(sc, sets, set_count); 423 break; 424 case CPUFREQ_TYPE_RELATIVE: 425 set_arr = malloc(sizeof(*set_arr), M_TEMP, M_NOWAIT); 426 if (set_arr == NULL) { 427 error = ENOMEM; 428 goto out; 429 } 430 bcopy(sets, set_arr->sets, set_count * sizeof(*sets)); 431 set_arr->count = set_count; 432 TAILQ_INSERT_TAIL(&rel_sets, set_arr, link); 433 break; 434 default: 435 error = EINVAL; 436 break; 437 } 438 if (error) 439 goto out; 440 } 441 442 /* 443 * If there are no absolute levels, create a fake one at 100%. We 444 * then cache the clockrate for later use as our base frequency. 445 * 446 * XXX This assumes that the first time through, if we only have 447 * relative drivers, the CPU is currently running at 100%. 448 */ 449 if (TAILQ_EMPTY(&sc->all_levels)) { 450 if (sc->max_mhz == CPUFREQ_VAL_UNKNOWN) { 451 pc = cpu_get_pcpu(dev); 452 cpu_est_clockrate(pc->pc_cpuid, &rate); 453 sc->max_mhz = rate / 1000000; 454 } 455 memset(&sets[0], CPUFREQ_VAL_UNKNOWN, sizeof(*sets)); 456 sets[0].freq = sc->max_mhz; 457 sets[0].dev = NULL; 458 error = cpufreq_insert_abs(sc, sets, 1); 459 if (error) 460 goto out; 461 } 462 463 /* Create a combined list of absolute + relative levels. */ 464 TAILQ_FOREACH(set_arr, &rel_sets, link) 465 cpufreq_expand_set(sc, set_arr); 466 467 /* If the caller doesn't have enough space, return the actual count. */ 468 if (sc->all_count > *count) { 469 *count = sc->all_count; 470 error = E2BIG; 471 goto out; 472 } 473 474 /* Finally, output the list of levels. */ 475 i = 0; 476 TAILQ_FOREACH(lev, &sc->all_levels, link) { 477 levels[i] = *lev; 478 i++; 479 } 480 *count = sc->all_count; 481 error = 0; 482 483 out: 484 /* Clear all levels since we regenerate them each time. */ 485 while ((lev = TAILQ_FIRST(&sc->all_levels)) != NULL) { 486 TAILQ_REMOVE(&sc->all_levels, lev, link); 487 free(lev, M_TEMP); 488 } 489 while ((set_arr = TAILQ_FIRST(&rel_sets)) != NULL) { 490 TAILQ_REMOVE(&rel_sets, set_arr, link); 491 free(set_arr, M_TEMP); 492 } 493 sc->all_count = 0; 494 free(devs, M_TEMP); 495 free(sets, M_TEMP); 496 return (error); 497 } 498 499 /* 500 * Create levels for an array of absolute settings and insert them in 501 * sorted order in the specified list. 502 */ 503 static int 504 cpufreq_insert_abs(struct cpufreq_softc *sc, struct cf_setting *sets, 505 int count) 506 { 507 struct cf_level_lst *list; 508 struct cf_level *level, *search; 509 int i; 510 511 list = &sc->all_levels; 512 for (i = 0; i < count; i++) { 513 level = malloc(sizeof(*level), M_TEMP, M_NOWAIT | M_ZERO); 514 if (level == NULL) 515 return (ENOMEM); 516 level->abs_set = sets[i]; 517 level->total_set = sets[i]; 518 level->total_set.dev = NULL; 519 sc->all_count++; 520 521 if (TAILQ_EMPTY(list)) { 522 TAILQ_INSERT_HEAD(list, level, link); 523 continue; 524 } 525 526 TAILQ_FOREACH_REVERSE(search, list, cf_level_lst, link) { 527 if (sets[i].freq <= search->total_set.freq) { 528 TAILQ_INSERT_AFTER(list, search, level, link); 529 break; 530 } 531 } 532 } 533 return (0); 534 } 535 536 /* 537 * Expand a group of relative settings, creating derived levels from them. 538 */ 539 static int 540 cpufreq_expand_set(struct cpufreq_softc *sc, struct cf_setting_array *set_arr) 541 { 542 struct cf_level *fill, *search; 543 struct cf_setting *set; 544 int i; 545 546 TAILQ_FOREACH(search, &sc->all_levels, link) { 547 /* Skip this level if we've already modified it. */ 548 for (i = 0; i < search->rel_count; i++) { 549 if (search->rel_set[i].dev == set_arr->sets[0].dev) 550 break; 551 } 552 if (i != search->rel_count) 553 continue; 554 555 /* Add each setting to the level, duplicating if necessary. */ 556 for (i = 0; i < set_arr->count; i++) { 557 set = &set_arr->sets[i]; 558 559 /* 560 * If this setting is less than 100%, split the level 561 * into two and add this setting to the new level. 562 */ 563 fill = search; 564 if (set->freq < 10000) 565 fill = cpufreq_dup_set(sc, search, set); 566 567 /* 568 * The new level was a duplicate of an existing level 569 * so we freed it. Go to the next setting. 570 */ 571 if (fill == NULL) 572 continue; 573 574 /* Add this setting to the existing or new level. */ 575 KASSERT(fill->rel_count < MAX_SETTINGS, 576 ("cpufreq: too many relative drivers (%d)", 577 MAX_SETTINGS)); 578 fill->rel_set[fill->rel_count] = *set; 579 fill->rel_count++; 580 } 581 } 582 583 return (0); 584 } 585 586 static struct cf_level * 587 cpufreq_dup_set(struct cpufreq_softc *sc, struct cf_level *dup, 588 struct cf_setting *set) 589 { 590 struct cf_level_lst *list; 591 struct cf_level *fill, *itr; 592 struct cf_setting *fill_set, *itr_set; 593 int i; 594 595 /* 596 * Create a new level, copy it from the old one, and update the 597 * total frequency and power by the percentage specified in the 598 * relative setting. 599 */ 600 fill = malloc(sizeof(*fill), M_TEMP, M_NOWAIT); 601 if (fill == NULL) 602 return (NULL); 603 *fill = *dup; 604 fill_set = &fill->total_set; 605 fill_set->freq = 606 ((uint64_t)fill_set->freq * set->freq) / 10000; 607 if (fill_set->power != CPUFREQ_VAL_UNKNOWN) { 608 fill_set->power = ((uint64_t)fill_set->power * set->freq) 609 / 10000; 610 } 611 if (set->lat != CPUFREQ_VAL_UNKNOWN) { 612 if (fill_set->lat != CPUFREQ_VAL_UNKNOWN) 613 fill_set->lat += set->lat; 614 else 615 fill_set->lat = set->lat; 616 } 617 618 /* 619 * If we copied an old level that we already modified (say, at 100%), 620 * we need to remove that setting before adding this one. Since we 621 * process each setting array in order, we know any settings for this 622 * driver will be found at the end. 623 */ 624 for (i = fill->rel_count; i != 0; i--) { 625 if (fill->rel_set[i - 1].dev != set->dev) 626 break; 627 fill->rel_count--; 628 } 629 630 /* 631 * Insert the new level in sorted order. If we find a duplicate, 632 * free the new level. We can do this since any existing level will 633 * be guaranteed to have the same or less settings and thus consume 634 * less power. For example, a level with one absolute setting of 635 * 800 Mhz uses less power than one composed of an absolute setting 636 * of 1600 Mhz and a relative setting at 50%. 637 */ 638 list = &sc->all_levels; 639 if (TAILQ_EMPTY(list)) { 640 TAILQ_INSERT_HEAD(list, fill, link); 641 } else { 642 TAILQ_FOREACH_REVERSE(itr, list, cf_level_lst, link) { 643 itr_set = &itr->total_set; 644 if (CPUFREQ_CMP(fill_set->freq, itr_set->freq)) { 645 free(fill, M_TEMP); 646 fill = NULL; 647 break; 648 } else if (fill_set->freq < itr_set->freq) { 649 TAILQ_INSERT_AFTER(list, itr, fill, link); 650 sc->all_count++; 651 break; 652 } 653 } 654 } 655 656 return (fill); 657 } 658 659 static int 660 cpufreq_curr_sysctl(SYSCTL_HANDLER_ARGS) 661 { 662 struct cpufreq_softc *sc; 663 struct cf_level *levels; 664 int count, devcount, error, freq, i, n; 665 device_t *devs; 666 667 devs = NULL; 668 sc = oidp->oid_arg1; 669 levels = malloc(CF_MAX_LEVELS * sizeof(*levels), M_TEMP, M_NOWAIT); 670 if (levels == NULL) 671 return (ENOMEM); 672 673 error = CPUFREQ_GET(sc->dev, &levels[0]); 674 if (error) 675 goto out; 676 freq = levels[0].total_set.freq; 677 error = sysctl_handle_int(oidp, &freq, 0, req); 678 if (error != 0 || req->newptr == NULL) 679 goto out; 680 681 /* 682 * While we only call cpufreq_get() on one device (assuming all 683 * CPUs have equal levels), we call cpufreq_set() on all CPUs. 684 * This is needed for some MP systems. 685 */ 686 error = devclass_get_devices(cpufreq_dc, &devs, &devcount); 687 if (error) 688 goto out; 689 for (n = 0; n < devcount; n++) { 690 count = CF_MAX_LEVELS; 691 error = CPUFREQ_LEVELS(devs[n], levels, &count); 692 if (error) { 693 if (error == E2BIG) 694 printf( 695 "cpufreq: need to increase CF_MAX_LEVELS\n"); 696 break; 697 } 698 for (i = 0; i < count; i++) { 699 if (CPUFREQ_CMP(levels[i].total_set.freq, freq)) { 700 error = CPUFREQ_SET(devs[n], &levels[i], 701 CPUFREQ_PRIO_USER); 702 break; 703 } 704 } 705 if (i == count) { 706 error = EINVAL; 707 break; 708 } 709 } 710 711 out: 712 if (devs) 713 free(devs, M_TEMP); 714 if (levels) 715 free(levels, M_TEMP); 716 return (error); 717 } 718 719 static int 720 cpufreq_levels_sysctl(SYSCTL_HANDLER_ARGS) 721 { 722 struct cpufreq_softc *sc; 723 struct cf_level *levels; 724 struct cf_setting *set; 725 struct sbuf sb; 726 int count, error, i; 727 728 sc = oidp->oid_arg1; 729 sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND); 730 731 /* Get settings from the device and generate the output string. */ 732 count = CF_MAX_LEVELS; 733 levels = malloc(count * sizeof(*levels), M_TEMP, M_NOWAIT); 734 if (levels == NULL) 735 return (ENOMEM); 736 error = CPUFREQ_LEVELS(sc->dev, levels, &count); 737 if (error) { 738 if (error == E2BIG) 739 printf("cpufreq: need to increase CF_MAX_LEVELS\n"); 740 goto out; 741 } 742 if (count) { 743 for (i = 0; i < count; i++) { 744 set = &levels[i].total_set; 745 sbuf_printf(&sb, "%d/%d ", set->freq, set->power); 746 } 747 } else 748 sbuf_cpy(&sb, ""); 749 sbuf_trim(&sb); 750 sbuf_finish(&sb); 751 error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req); 752 753 out: 754 free(levels, M_TEMP); 755 sbuf_delete(&sb); 756 return (error); 757 } 758 759 static int 760 cpufreq_settings_sysctl(SYSCTL_HANDLER_ARGS) 761 { 762 device_t dev; 763 struct cf_setting *sets; 764 struct sbuf sb; 765 int error, i, set_count; 766 767 dev = oidp->oid_arg1; 768 sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND); 769 770 /* Get settings from the device and generate the output string. */ 771 set_count = MAX_SETTINGS; 772 sets = malloc(set_count * sizeof(*sets), M_TEMP, M_NOWAIT); 773 if (sets == NULL) 774 return (ENOMEM); 775 error = CPUFREQ_DRV_SETTINGS(dev, sets, &set_count); 776 if (error) 777 goto out; 778 if (set_count) { 779 for (i = 0; i < set_count; i++) 780 sbuf_printf(&sb, "%d/%d ", sets[i].freq, sets[i].power); 781 } else 782 sbuf_cpy(&sb, ""); 783 sbuf_trim(&sb); 784 sbuf_finish(&sb); 785 error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req); 786 787 out: 788 free(sets, M_TEMP); 789 sbuf_delete(&sb); 790 return (error); 791 } 792 793 int 794 cpufreq_register(device_t dev) 795 { 796 struct cpufreq_softc *sc; 797 device_t cf_dev, cpu_dev; 798 799 /* Add a sysctl to get each driver's settings separately. */ 800 SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev), 801 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), 802 OID_AUTO, "freq_settings", CTLTYPE_STRING | CTLFLAG_RD, dev, 0, 803 cpufreq_settings_sysctl, "A", "CPU frequency driver settings"); 804 805 /* 806 * Add only one cpufreq device to each CPU. Currently, all CPUs 807 * must offer the same levels and be switched at the same time. 808 */ 809 cpu_dev = device_get_parent(dev); 810 if ((cf_dev = device_find_child(cpu_dev, "cpufreq", -1))) { 811 sc = device_get_softc(cf_dev); 812 sc->max_mhz = CPUFREQ_VAL_UNKNOWN; 813 return (0); 814 } 815 816 /* Add the child device and possibly sysctls. */ 817 cf_dev = BUS_ADD_CHILD(cpu_dev, 0, "cpufreq", -1); 818 if (cf_dev == NULL) 819 return (ENOMEM); 820 device_quiet(cf_dev); 821 822 return (device_probe_and_attach(cf_dev)); 823 } 824 825 int 826 cpufreq_unregister(device_t dev) 827 { 828 device_t cf_dev, *devs; 829 int cfcount, devcount, error, i, type; 830 831 /* 832 * If this is the last cpufreq child device, remove the control 833 * device as well. We identify cpufreq children by calling a method 834 * they support. 835 */ 836 error = device_get_children(device_get_parent(dev), &devs, &devcount); 837 if (error) 838 return (error); 839 cf_dev = device_find_child(device_get_parent(dev), "cpufreq", -1); 840 cfcount = 0; 841 for (i = 0; i < devcount; i++) { 842 if (!device_is_attached(devs[i])) 843 continue; 844 if (CPUFREQ_DRV_TYPE(devs[i], &type) == 0) 845 cfcount++; 846 } 847 if (cfcount <= 1) 848 device_delete_child(device_get_parent(cf_dev), cf_dev); 849 free(devs, M_TEMP); 850 851 return (0); 852 }
Cache object: e90e8c21c01f4f519bf2053de8915495
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