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("$FreeBSD$"); 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/lock.h> 36 #include <sys/malloc.h> 37 #include <sys/module.h> 38 #include <sys/proc.h> 39 #include <sys/queue.h> 40 #include <sys/sched.h> 41 #include <sys/sysctl.h> 42 #include <sys/systm.h> 43 #include <sys/sbuf.h> 44 #include <sys/sx.h> 45 #include <sys/timetc.h> 46 47 #include "cpufreq_if.h" 48 49 /* 50 * Common CPU frequency glue code. Drivers for specific hardware can 51 * attach this interface to allow users to get/set the CPU frequency. 52 */ 53 54 /* 55 * Number of levels we can handle. Levels are synthesized from settings 56 * so for M settings and N drivers, there may be M*N levels. 57 */ 58 #define CF_MAX_LEVELS 64 59 60 struct cf_saved_freq { 61 struct cf_level level; 62 int priority; 63 SLIST_ENTRY(cf_saved_freq) link; 64 }; 65 66 struct cpufreq_softc { 67 struct sx lock; 68 struct cf_level curr_level; 69 int curr_priority; 70 SLIST_HEAD(, cf_saved_freq) saved_freq; 71 struct cf_level_lst all_levels; 72 int all_count; 73 int max_mhz; 74 device_t dev; 75 struct sysctl_ctx_list sysctl_ctx; 76 }; 77 78 struct cf_setting_array { 79 struct cf_setting sets[MAX_SETTINGS]; 80 int count; 81 TAILQ_ENTRY(cf_setting_array) link; 82 }; 83 84 TAILQ_HEAD(cf_setting_lst, cf_setting_array); 85 86 #define CF_MTX_INIT(x) sx_init((x), "cpufreq lock") 87 #define CF_MTX_LOCK(x) sx_xlock((x)) 88 #define CF_MTX_UNLOCK(x) sx_xunlock((x)) 89 #define CF_MTX_ASSERT(x) sx_assert((x), SX_XLOCKED) 90 91 #define CF_DEBUG(msg...) do { \ 92 if (cf_verbose) \ 93 printf("cpufreq: " msg); \ 94 } while (0) 95 96 static int cpufreq_attach(device_t dev); 97 static int cpufreq_detach(device_t dev); 98 static void cpufreq_evaluate(void *arg); 99 static int cf_set_method(device_t dev, const struct cf_level *level, 100 int priority); 101 static int cf_get_method(device_t dev, struct cf_level *level); 102 static int cf_levels_method(device_t dev, struct cf_level *levels, 103 int *count); 104 static int cpufreq_insert_abs(struct cpufreq_softc *sc, 105 struct cf_setting *sets, int count); 106 static int cpufreq_expand_set(struct cpufreq_softc *sc, 107 struct cf_setting_array *set_arr); 108 static struct cf_level *cpufreq_dup_set(struct cpufreq_softc *sc, 109 struct cf_level *dup, struct cf_setting *set); 110 static int cpufreq_curr_sysctl(SYSCTL_HANDLER_ARGS); 111 static int cpufreq_levels_sysctl(SYSCTL_HANDLER_ARGS); 112 static int cpufreq_settings_sysctl(SYSCTL_HANDLER_ARGS); 113 114 static device_method_t cpufreq_methods[] = { 115 DEVMETHOD(device_probe, bus_generic_probe), 116 DEVMETHOD(device_attach, cpufreq_attach), 117 DEVMETHOD(device_detach, cpufreq_detach), 118 119 DEVMETHOD(cpufreq_set, cf_set_method), 120 DEVMETHOD(cpufreq_get, cf_get_method), 121 DEVMETHOD(cpufreq_levels, cf_levels_method), 122 {0, 0} 123 }; 124 static driver_t cpufreq_driver = { 125 "cpufreq", cpufreq_methods, sizeof(struct cpufreq_softc) 126 }; 127 static devclass_t cpufreq_dc; 128 DRIVER_MODULE(cpufreq, cpu, cpufreq_driver, cpufreq_dc, 0, 0); 129 130 static eventhandler_tag cf_ev_tag; 131 132 static int cf_lowest_freq; 133 static int cf_verbose; 134 TUNABLE_INT("debug.cpufreq.lowest", &cf_lowest_freq); 135 TUNABLE_INT("debug.cpufreq.verbose", &cf_verbose); 136 SYSCTL_NODE(_debug, OID_AUTO, cpufreq, CTLFLAG_RD, NULL, "cpufreq debugging"); 137 SYSCTL_INT(_debug_cpufreq, OID_AUTO, lowest, CTLFLAG_RW, &cf_lowest_freq, 1, 138 "Don't provide levels below this frequency."); 139 SYSCTL_INT(_debug_cpufreq, OID_AUTO, verbose, CTLFLAG_RW, &cf_verbose, 1, 140 "Print verbose debugging messages"); 141 142 static int 143 cpufreq_attach(device_t dev) 144 { 145 struct cpufreq_softc *sc; 146 device_t parent; 147 int numdevs; 148 149 CF_DEBUG("initializing %s\n", device_get_nameunit(dev)); 150 sc = device_get_softc(dev); 151 parent = device_get_parent(dev); 152 sc->dev = dev; 153 sysctl_ctx_init(&sc->sysctl_ctx); 154 TAILQ_INIT(&sc->all_levels); 155 CF_MTX_INIT(&sc->lock); 156 sc->curr_level.total_set.freq = CPUFREQ_VAL_UNKNOWN; 157 SLIST_INIT(&sc->saved_freq); 158 sc->max_mhz = CPUFREQ_VAL_UNKNOWN; 159 160 /* 161 * Only initialize one set of sysctls for all CPUs. In the future, 162 * if multiple CPUs can have different settings, we can move these 163 * sysctls to be under every CPU instead of just the first one. 164 */ 165 numdevs = devclass_get_count(cpufreq_dc); 166 if (numdevs > 1) 167 return (0); 168 169 CF_DEBUG("initializing one-time data for %s\n", 170 device_get_nameunit(dev)); 171 SYSCTL_ADD_PROC(&sc->sysctl_ctx, 172 SYSCTL_CHILDREN(device_get_sysctl_tree(parent)), 173 OID_AUTO, "freq", CTLTYPE_INT | CTLFLAG_RW, sc, 0, 174 cpufreq_curr_sysctl, "I", "Current CPU frequency"); 175 SYSCTL_ADD_PROC(&sc->sysctl_ctx, 176 SYSCTL_CHILDREN(device_get_sysctl_tree(parent)), 177 OID_AUTO, "freq_levels", CTLTYPE_STRING | CTLFLAG_RD, sc, 0, 178 cpufreq_levels_sysctl, "A", "CPU frequency levels"); 179 cf_ev_tag = EVENTHANDLER_REGISTER(cpufreq_changed, cpufreq_evaluate, 180 NULL, EVENTHANDLER_PRI_ANY); 181 182 return (0); 183 } 184 185 static int 186 cpufreq_detach(device_t dev) 187 { 188 struct cpufreq_softc *sc; 189 struct cf_saved_freq *saved_freq; 190 int numdevs; 191 192 CF_DEBUG("shutdown %s\n", device_get_nameunit(dev)); 193 sc = device_get_softc(dev); 194 sysctl_ctx_free(&sc->sysctl_ctx); 195 196 while ((saved_freq = SLIST_FIRST(&sc->saved_freq)) != NULL) { 197 SLIST_REMOVE_HEAD(&sc->saved_freq, link); 198 free(saved_freq, M_TEMP); 199 } 200 201 /* Only clean up these resources when the last device is detaching. */ 202 numdevs = devclass_get_count(cpufreq_dc); 203 if (numdevs == 1) { 204 CF_DEBUG("final shutdown for %s\n", device_get_nameunit(dev)); 205 EVENTHANDLER_DEREGISTER(cpufreq_changed, cf_ev_tag); 206 } 207 208 return (0); 209 } 210 211 static void 212 cpufreq_evaluate(void *arg) 213 { 214 /* TODO: Re-evaluate when notified of changes to drivers. */ 215 } 216 217 static int 218 cf_set_method(device_t dev, const struct cf_level *level, int priority) 219 { 220 struct cpufreq_softc *sc; 221 const struct cf_setting *set; 222 struct cf_saved_freq *saved_freq, *curr_freq; 223 struct pcpu *pc; 224 int cpu_id, error, i; 225 226 sc = device_get_softc(dev); 227 error = 0; 228 set = NULL; 229 saved_freq = NULL; 230 231 /* 232 * Check that the TSC isn't being used as a timecounter. 233 * If it is, then return EBUSY and refuse to change the 234 * clock speed. 235 */ 236 if (strcmp(timecounter->tc_name, "TSC") == 0) 237 return (EBUSY); 238 239 CF_MTX_LOCK(&sc->lock); 240 241 /* 242 * If the requested level has a lower priority, don't allow 243 * the new level right now. 244 */ 245 if (priority < sc->curr_priority) { 246 CF_DEBUG("ignoring, curr prio %d less than %d\n", priority, 247 sc->curr_priority); 248 error = EPERM; 249 goto out; 250 } 251 252 /* 253 * If the caller didn't specify a level and one is saved, prepare to 254 * restore the saved level. If none has been saved, return an error. 255 */ 256 if (level == NULL) { 257 saved_freq = SLIST_FIRST(&sc->saved_freq); 258 if (saved_freq == NULL) { 259 CF_DEBUG("NULL level, no saved level\n"); 260 error = ENXIO; 261 goto out; 262 } 263 level = &saved_freq->level; 264 priority = saved_freq->priority; 265 CF_DEBUG("restoring saved level, freq %d prio %d\n", 266 level->total_set.freq, priority); 267 } 268 269 /* Reject levels that are below our specified threshold. */ 270 if (level->total_set.freq < cf_lowest_freq) { 271 CF_DEBUG("rejecting freq %d, less than %d limit\n", 272 level->total_set.freq, cf_lowest_freq); 273 error = EINVAL; 274 goto out; 275 } 276 277 /* If already at this level, just return. */ 278 if (CPUFREQ_CMP(sc->curr_level.total_set.freq, level->total_set.freq)) { 279 CF_DEBUG("skipping freq %d, same as current level %d\n", 280 level->total_set.freq, sc->curr_level.total_set.freq); 281 goto skip; 282 } 283 284 /* First, set the absolute frequency via its driver. */ 285 set = &level->abs_set; 286 if (set->dev) { 287 if (!device_is_attached(set->dev)) { 288 error = ENXIO; 289 goto out; 290 } 291 292 /* Bind to the target CPU before switching, if necessary. */ 293 cpu_id = PCPU_GET(cpuid); 294 pc = cpu_get_pcpu(set->dev); 295 if (cpu_id != pc->pc_cpuid) { 296 mtx_lock_spin(&sched_lock); 297 sched_bind(curthread, pc->pc_cpuid); 298 mtx_unlock_spin(&sched_lock); 299 } 300 CF_DEBUG("setting abs freq %d on %s (cpu %d)\n", set->freq, 301 device_get_nameunit(set->dev), PCPU_GET(cpuid)); 302 error = CPUFREQ_DRV_SET(set->dev, set); 303 if (cpu_id != pc->pc_cpuid) { 304 mtx_lock_spin(&sched_lock); 305 sched_unbind(curthread); 306 mtx_unlock_spin(&sched_lock); 307 } 308 if (error) { 309 goto out; 310 } 311 } 312 313 /* Next, set any/all relative frequencies via their drivers. */ 314 for (i = 0; i < level->rel_count; i++) { 315 set = &level->rel_set[i]; 316 if (!device_is_attached(set->dev)) { 317 error = ENXIO; 318 goto out; 319 } 320 321 /* Bind to the target CPU before switching, if necessary. */ 322 cpu_id = PCPU_GET(cpuid); 323 pc = cpu_get_pcpu(set->dev); 324 if (cpu_id != pc->pc_cpuid) { 325 mtx_lock_spin(&sched_lock); 326 sched_bind(curthread, pc->pc_cpuid); 327 mtx_unlock_spin(&sched_lock); 328 } 329 CF_DEBUG("setting rel freq %d on %s (cpu %d)\n", set->freq, 330 device_get_nameunit(set->dev), PCPU_GET(cpuid)); 331 error = CPUFREQ_DRV_SET(set->dev, set); 332 if (cpu_id != pc->pc_cpuid) { 333 mtx_lock_spin(&sched_lock); 334 sched_unbind(curthread); 335 mtx_unlock_spin(&sched_lock); 336 } 337 if (error) { 338 /* XXX Back out any successful setting? */ 339 goto out; 340 } 341 } 342 343 skip: 344 /* 345 * Before recording the current level, check if we're going to a 346 * higher priority. If so, save the previous level and priority. 347 */ 348 if (sc->curr_level.total_set.freq != CPUFREQ_VAL_UNKNOWN && 349 priority > sc->curr_priority) { 350 CF_DEBUG("saving level, freq %d prio %d\n", 351 sc->curr_level.total_set.freq, sc->curr_priority); 352 curr_freq = malloc(sizeof(*curr_freq), M_TEMP, M_NOWAIT); 353 if (curr_freq == NULL) { 354 error = ENOMEM; 355 goto out; 356 } 357 curr_freq->level = sc->curr_level; 358 curr_freq->priority = sc->curr_priority; 359 SLIST_INSERT_HEAD(&sc->saved_freq, curr_freq, link); 360 } 361 sc->curr_level = *level; 362 sc->curr_priority = priority; 363 364 /* If we were restoring a saved state, reset it to "unused". */ 365 if (saved_freq != NULL) { 366 CF_DEBUG("resetting saved level\n"); 367 sc->curr_level.total_set.freq = CPUFREQ_VAL_UNKNOWN; 368 SLIST_REMOVE_HEAD(&sc->saved_freq, link); 369 free(saved_freq, M_TEMP); 370 } 371 372 out: 373 CF_MTX_UNLOCK(&sc->lock); 374 if (error && set) 375 device_printf(set->dev, "set freq failed, err %d\n", error); 376 return (error); 377 } 378 379 static int 380 cf_get_method(device_t dev, struct cf_level *level) 381 { 382 struct cpufreq_softc *sc; 383 struct cf_level *levels; 384 struct cf_setting *curr_set, set; 385 struct pcpu *pc; 386 device_t *devs; 387 int count, error, i, numdevs; 388 uint64_t rate; 389 390 sc = device_get_softc(dev); 391 error = 0; 392 levels = NULL; 393 394 /* If we already know the current frequency, we're done. */ 395 CF_MTX_LOCK(&sc->lock); 396 curr_set = &sc->curr_level.total_set; 397 if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) { 398 CF_DEBUG("get returning known freq %d\n", curr_set->freq); 399 goto out; 400 } 401 CF_MTX_UNLOCK(&sc->lock); 402 403 /* 404 * We need to figure out the current level. Loop through every 405 * driver, getting the current setting. Then, attempt to get a best 406 * match of settings against each level. 407 */ 408 count = CF_MAX_LEVELS; 409 levels = malloc(count * sizeof(*levels), M_TEMP, M_NOWAIT); 410 if (levels == NULL) 411 return (ENOMEM); 412 error = CPUFREQ_LEVELS(sc->dev, levels, &count); 413 if (error) { 414 if (error == E2BIG) 415 printf("cpufreq: need to increase CF_MAX_LEVELS\n"); 416 free(levels, M_TEMP); 417 return (error); 418 } 419 error = device_get_children(device_get_parent(dev), &devs, &numdevs); 420 if (error) { 421 free(levels, M_TEMP); 422 return (error); 423 } 424 425 /* 426 * Reacquire the lock and search for the given level. 427 * 428 * XXX Note: this is not quite right since we really need to go 429 * through each level and compare both absolute and relative 430 * settings for each driver in the system before making a match. 431 * The estimation code below catches this case though. 432 */ 433 CF_MTX_LOCK(&sc->lock); 434 for (i = 0; i < numdevs && curr_set->freq == CPUFREQ_VAL_UNKNOWN; i++) { 435 if (!device_is_attached(devs[i])) 436 continue; 437 error = CPUFREQ_DRV_GET(devs[i], &set); 438 if (error) 439 continue; 440 for (i = 0; i < count; i++) { 441 if (CPUFREQ_CMP(set.freq, levels[i].total_set.freq)) { 442 sc->curr_level = levels[i]; 443 break; 444 } 445 } 446 } 447 free(devs, M_TEMP); 448 if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) { 449 CF_DEBUG("get matched freq %d from drivers\n", curr_set->freq); 450 goto out; 451 } 452 453 /* 454 * We couldn't find an exact match, so attempt to estimate and then 455 * match against a level. 456 */ 457 pc = cpu_get_pcpu(dev); 458 if (pc == NULL) { 459 error = ENXIO; 460 goto out; 461 } 462 cpu_est_clockrate(pc->pc_cpuid, &rate); 463 rate /= 1000000; 464 for (i = 0; i < count; i++) { 465 if (CPUFREQ_CMP(rate, levels[i].total_set.freq)) { 466 sc->curr_level = levels[i]; 467 CF_DEBUG("get estimated freq %d\n", curr_set->freq); 468 break; 469 } 470 } 471 472 out: 473 if (error == 0) 474 *level = sc->curr_level; 475 476 CF_MTX_UNLOCK(&sc->lock); 477 if (levels) 478 free(levels, M_TEMP); 479 return (error); 480 } 481 482 static int 483 cf_levels_method(device_t dev, struct cf_level *levels, int *count) 484 { 485 struct cf_setting_array *set_arr; 486 struct cf_setting_lst rel_sets; 487 struct cpufreq_softc *sc; 488 struct cf_level *lev; 489 struct cf_setting *sets; 490 struct pcpu *pc; 491 device_t *devs; 492 int error, i, numdevs, set_count, type; 493 uint64_t rate; 494 495 if (levels == NULL || count == NULL) 496 return (EINVAL); 497 498 TAILQ_INIT(&rel_sets); 499 sc = device_get_softc(dev); 500 error = device_get_children(device_get_parent(dev), &devs, &numdevs); 501 if (error) 502 return (error); 503 sets = malloc(MAX_SETTINGS * sizeof(*sets), M_TEMP, M_NOWAIT); 504 if (sets == NULL) { 505 free(devs, M_TEMP); 506 return (ENOMEM); 507 } 508 509 /* Get settings from all cpufreq drivers. */ 510 CF_MTX_LOCK(&sc->lock); 511 for (i = 0; i < numdevs; i++) { 512 /* Skip devices that aren't ready. */ 513 if (!device_is_attached(devs[i])) 514 continue; 515 516 /* 517 * Get settings, skipping drivers that offer no settings or 518 * provide settings for informational purposes only. 519 */ 520 error = CPUFREQ_DRV_TYPE(devs[i], &type); 521 if (error || (type & CPUFREQ_FLAG_INFO_ONLY)) { 522 if (error == 0) { 523 CF_DEBUG("skipping info-only driver %s\n", 524 device_get_nameunit(devs[i])); 525 } 526 continue; 527 } 528 set_count = MAX_SETTINGS; 529 error = CPUFREQ_DRV_SETTINGS(devs[i], sets, &set_count); 530 if (error || set_count == 0) 531 continue; 532 533 /* Add the settings to our absolute/relative lists. */ 534 switch (type & CPUFREQ_TYPE_MASK) { 535 case CPUFREQ_TYPE_ABSOLUTE: 536 error = cpufreq_insert_abs(sc, sets, set_count); 537 break; 538 case CPUFREQ_TYPE_RELATIVE: 539 CF_DEBUG("adding %d relative settings\n", set_count); 540 set_arr = malloc(sizeof(*set_arr), M_TEMP, M_NOWAIT); 541 if (set_arr == NULL) { 542 error = ENOMEM; 543 goto out; 544 } 545 bcopy(sets, set_arr->sets, set_count * sizeof(*sets)); 546 set_arr->count = set_count; 547 TAILQ_INSERT_TAIL(&rel_sets, set_arr, link); 548 break; 549 default: 550 error = EINVAL; 551 } 552 if (error) 553 goto out; 554 } 555 556 /* 557 * If there are no absolute levels, create a fake one at 100%. We 558 * then cache the clockrate for later use as our base frequency. 559 * 560 * XXX This assumes that the first time through, if we only have 561 * relative drivers, the CPU is currently running at 100%. 562 */ 563 if (TAILQ_EMPTY(&sc->all_levels)) { 564 if (sc->max_mhz == CPUFREQ_VAL_UNKNOWN) { 565 pc = cpu_get_pcpu(dev); 566 cpu_est_clockrate(pc->pc_cpuid, &rate); 567 sc->max_mhz = rate / 1000000; 568 } 569 memset(&sets[0], CPUFREQ_VAL_UNKNOWN, sizeof(*sets)); 570 sets[0].freq = sc->max_mhz; 571 sets[0].dev = NULL; 572 error = cpufreq_insert_abs(sc, sets, 1); 573 if (error) 574 goto out; 575 } 576 577 /* Create a combined list of absolute + relative levels. */ 578 TAILQ_FOREACH(set_arr, &rel_sets, link) 579 cpufreq_expand_set(sc, set_arr); 580 581 /* If the caller doesn't have enough space, return the actual count. */ 582 if (sc->all_count > *count) { 583 *count = sc->all_count; 584 error = E2BIG; 585 goto out; 586 } 587 588 /* Finally, output the list of levels. */ 589 i = 0; 590 TAILQ_FOREACH(lev, &sc->all_levels, link) { 591 /* Skip levels that have a frequency that is too low. */ 592 if (lev->total_set.freq < cf_lowest_freq) { 593 sc->all_count--; 594 continue; 595 } 596 597 levels[i] = *lev; 598 i++; 599 } 600 *count = sc->all_count; 601 error = 0; 602 603 out: 604 /* Clear all levels since we regenerate them each time. */ 605 while ((lev = TAILQ_FIRST(&sc->all_levels)) != NULL) { 606 TAILQ_REMOVE(&sc->all_levels, lev, link); 607 free(lev, M_TEMP); 608 } 609 sc->all_count = 0; 610 611 CF_MTX_UNLOCK(&sc->lock); 612 while ((set_arr = TAILQ_FIRST(&rel_sets)) != NULL) { 613 TAILQ_REMOVE(&rel_sets, set_arr, link); 614 free(set_arr, M_TEMP); 615 } 616 free(devs, M_TEMP); 617 free(sets, M_TEMP); 618 return (error); 619 } 620 621 /* 622 * Create levels for an array of absolute settings and insert them in 623 * sorted order in the specified list. 624 */ 625 static int 626 cpufreq_insert_abs(struct cpufreq_softc *sc, struct cf_setting *sets, 627 int count) 628 { 629 struct cf_level_lst *list; 630 struct cf_level *level, *search; 631 int i; 632 633 CF_MTX_ASSERT(&sc->lock); 634 635 list = &sc->all_levels; 636 for (i = 0; i < count; i++) { 637 level = malloc(sizeof(*level), M_TEMP, M_NOWAIT | M_ZERO); 638 if (level == NULL) 639 return (ENOMEM); 640 level->abs_set = sets[i]; 641 level->total_set = sets[i]; 642 level->total_set.dev = NULL; 643 sc->all_count++; 644 645 if (TAILQ_EMPTY(list)) { 646 CF_DEBUG("adding abs setting %d at head\n", 647 sets[i].freq); 648 TAILQ_INSERT_HEAD(list, level, link); 649 continue; 650 } 651 652 TAILQ_FOREACH_REVERSE(search, list, cf_level_lst, link) { 653 if (sets[i].freq <= search->total_set.freq) { 654 CF_DEBUG("adding abs setting %d after %d\n", 655 sets[i].freq, search->total_set.freq); 656 TAILQ_INSERT_AFTER(list, search, level, link); 657 break; 658 } 659 } 660 } 661 return (0); 662 } 663 664 /* 665 * Expand a group of relative settings, creating derived levels from them. 666 */ 667 static int 668 cpufreq_expand_set(struct cpufreq_softc *sc, struct cf_setting_array *set_arr) 669 { 670 struct cf_level *fill, *search; 671 struct cf_setting *set; 672 int i; 673 674 CF_MTX_ASSERT(&sc->lock); 675 676 /* 677 * Walk the set of all existing levels in reverse. This is so we 678 * create derived states from the lowest absolute settings first 679 * and discard duplicates created from higher absolute settings. 680 * For instance, a level of 50 Mhz derived from 100 Mhz + 50% is 681 * preferable to 200 Mhz + 25% because absolute settings are more 682 * efficient since they often change the voltage as well. 683 */ 684 TAILQ_FOREACH_REVERSE(search, &sc->all_levels, cf_level_lst, link) { 685 /* Add each setting to the level, duplicating if necessary. */ 686 for (i = 0; i < set_arr->count; i++) { 687 set = &set_arr->sets[i]; 688 689 /* 690 * If this setting is less than 100%, split the level 691 * into two and add this setting to the new level. 692 */ 693 fill = search; 694 if (set->freq < 10000) { 695 fill = cpufreq_dup_set(sc, search, set); 696 697 /* 698 * The new level was a duplicate of an existing 699 * level or its absolute setting is too high 700 * so we freed it. For example, we discard a 701 * derived level of 1000 MHz/25% if a level 702 * of 500 MHz/100% already exists. 703 */ 704 if (fill == NULL) 705 break; 706 } 707 708 /* Add this setting to the existing or new level. */ 709 KASSERT(fill->rel_count < MAX_SETTINGS, 710 ("cpufreq: too many relative drivers (%d)", 711 MAX_SETTINGS)); 712 fill->rel_set[fill->rel_count] = *set; 713 fill->rel_count++; 714 CF_DEBUG( 715 "expand set added rel setting %d%% to %d level\n", 716 set->freq / 100, fill->total_set.freq); 717 } 718 } 719 720 return (0); 721 } 722 723 static struct cf_level * 724 cpufreq_dup_set(struct cpufreq_softc *sc, struct cf_level *dup, 725 struct cf_setting *set) 726 { 727 struct cf_level_lst *list; 728 struct cf_level *fill, *itr; 729 struct cf_setting *fill_set, *itr_set; 730 int i; 731 732 CF_MTX_ASSERT(&sc->lock); 733 734 /* 735 * Create a new level, copy it from the old one, and update the 736 * total frequency and power by the percentage specified in the 737 * relative setting. 738 */ 739 fill = malloc(sizeof(*fill), M_TEMP, M_NOWAIT); 740 if (fill == NULL) 741 return (NULL); 742 *fill = *dup; 743 fill_set = &fill->total_set; 744 fill_set->freq = 745 ((uint64_t)fill_set->freq * set->freq) / 10000; 746 if (fill_set->power != CPUFREQ_VAL_UNKNOWN) { 747 fill_set->power = ((uint64_t)fill_set->power * set->freq) 748 / 10000; 749 } 750 if (set->lat != CPUFREQ_VAL_UNKNOWN) { 751 if (fill_set->lat != CPUFREQ_VAL_UNKNOWN) 752 fill_set->lat += set->lat; 753 else 754 fill_set->lat = set->lat; 755 } 756 CF_DEBUG("dup set considering derived setting %d\n", fill_set->freq); 757 758 /* 759 * If we copied an old level that we already modified (say, at 100%), 760 * we need to remove that setting before adding this one. Since we 761 * process each setting array in order, we know any settings for this 762 * driver will be found at the end. 763 */ 764 for (i = fill->rel_count; i != 0; i--) { 765 if (fill->rel_set[i - 1].dev != set->dev) 766 break; 767 CF_DEBUG("removed last relative driver: %s\n", 768 device_get_nameunit(set->dev)); 769 fill->rel_count--; 770 } 771 772 /* 773 * Insert the new level in sorted order. If it is a duplicate of an 774 * existing level (1) or has an absolute setting higher than the 775 * existing level (2), do not add it. We can do this since any such 776 * level is guaranteed use less power. For example (1), a level with 777 * one absolute setting of 800 Mhz uses less power than one composed 778 * of an absolute setting of 1600 Mhz and a relative setting at 50%. 779 * Also for example (2), a level of 800 Mhz/75% is preferable to 780 * 1600 Mhz/25% even though the latter has a lower total frequency. 781 */ 782 list = &sc->all_levels; 783 KASSERT(!TAILQ_EMPTY(list), ("all levels list empty in dup set")); 784 TAILQ_FOREACH_REVERSE(itr, list, cf_level_lst, link) { 785 itr_set = &itr->total_set; 786 if (CPUFREQ_CMP(fill_set->freq, itr_set->freq)) { 787 CF_DEBUG("dup set rejecting %d (dupe)\n", 788 fill_set->freq); 789 itr = NULL; 790 break; 791 } else if (fill_set->freq < itr_set->freq) { 792 if (fill->abs_set.freq <= itr->abs_set.freq) { 793 CF_DEBUG( 794 "dup done, inserting new level %d after %d\n", 795 fill_set->freq, itr_set->freq); 796 TAILQ_INSERT_AFTER(list, itr, fill, link); 797 sc->all_count++; 798 } else { 799 CF_DEBUG("dup set rejecting %d (abs too big)\n", 800 fill_set->freq); 801 itr = NULL; 802 } 803 break; 804 } 805 } 806 807 /* We didn't find a good place for this new level so free it. */ 808 if (itr == NULL) { 809 CF_DEBUG("dup set freeing new level %d (not optimal)\n", 810 fill_set->freq); 811 free(fill, M_TEMP); 812 fill = NULL; 813 } 814 815 return (fill); 816 } 817 818 static int 819 cpufreq_curr_sysctl(SYSCTL_HANDLER_ARGS) 820 { 821 struct cpufreq_softc *sc; 822 struct cf_level *levels; 823 int count, devcount, error, freq, i, n; 824 device_t *devs; 825 826 devs = NULL; 827 sc = oidp->oid_arg1; 828 levels = malloc(CF_MAX_LEVELS * sizeof(*levels), M_TEMP, M_NOWAIT); 829 if (levels == NULL) 830 return (ENOMEM); 831 832 error = CPUFREQ_GET(sc->dev, &levels[0]); 833 if (error) 834 goto out; 835 freq = levels[0].total_set.freq; 836 error = sysctl_handle_int(oidp, &freq, 0, req); 837 if (error != 0 || req->newptr == NULL) 838 goto out; 839 840 /* 841 * While we only call cpufreq_get() on one device (assuming all 842 * CPUs have equal levels), we call cpufreq_set() on all CPUs. 843 * This is needed for some MP systems. 844 */ 845 error = devclass_get_devices(cpufreq_dc, &devs, &devcount); 846 if (error) 847 goto out; 848 for (n = 0; n < devcount; n++) { 849 count = CF_MAX_LEVELS; 850 error = CPUFREQ_LEVELS(devs[n], levels, &count); 851 if (error) { 852 if (error == E2BIG) 853 printf( 854 "cpufreq: need to increase CF_MAX_LEVELS\n"); 855 break; 856 } 857 for (i = 0; i < count; i++) { 858 if (CPUFREQ_CMP(levels[i].total_set.freq, freq)) { 859 error = CPUFREQ_SET(devs[n], &levels[i], 860 CPUFREQ_PRIO_USER); 861 break; 862 } 863 } 864 if (i == count) { 865 error = EINVAL; 866 break; 867 } 868 } 869 870 out: 871 if (devs) 872 free(devs, M_TEMP); 873 if (levels) 874 free(levels, M_TEMP); 875 return (error); 876 } 877 878 static int 879 cpufreq_levels_sysctl(SYSCTL_HANDLER_ARGS) 880 { 881 struct cpufreq_softc *sc; 882 struct cf_level *levels; 883 struct cf_setting *set; 884 struct sbuf sb; 885 int count, error, i; 886 887 sc = oidp->oid_arg1; 888 sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND); 889 890 /* Get settings from the device and generate the output string. */ 891 count = CF_MAX_LEVELS; 892 levels = malloc(count * sizeof(*levels), M_TEMP, M_NOWAIT); 893 if (levels == NULL) 894 return (ENOMEM); 895 error = CPUFREQ_LEVELS(sc->dev, levels, &count); 896 if (error) { 897 if (error == E2BIG) 898 printf("cpufreq: need to increase CF_MAX_LEVELS\n"); 899 goto out; 900 } 901 if (count) { 902 for (i = 0; i < count; i++) { 903 set = &levels[i].total_set; 904 sbuf_printf(&sb, "%d/%d ", set->freq, set->power); 905 } 906 } else 907 sbuf_cpy(&sb, "0"); 908 sbuf_trim(&sb); 909 sbuf_finish(&sb); 910 error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req); 911 912 out: 913 free(levels, M_TEMP); 914 sbuf_delete(&sb); 915 return (error); 916 } 917 918 static int 919 cpufreq_settings_sysctl(SYSCTL_HANDLER_ARGS) 920 { 921 device_t dev; 922 struct cf_setting *sets; 923 struct sbuf sb; 924 int error, i, set_count; 925 926 dev = oidp->oid_arg1; 927 sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND); 928 929 /* Get settings from the device and generate the output string. */ 930 set_count = MAX_SETTINGS; 931 sets = malloc(set_count * sizeof(*sets), M_TEMP, M_NOWAIT); 932 if (sets == NULL) 933 return (ENOMEM); 934 error = CPUFREQ_DRV_SETTINGS(dev, sets, &set_count); 935 if (error) 936 goto out; 937 if (set_count) { 938 for (i = 0; i < set_count; i++) 939 sbuf_printf(&sb, "%d/%d ", sets[i].freq, sets[i].power); 940 } else 941 sbuf_cpy(&sb, "0"); 942 sbuf_trim(&sb); 943 sbuf_finish(&sb); 944 error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req); 945 946 out: 947 free(sets, M_TEMP); 948 sbuf_delete(&sb); 949 return (error); 950 } 951 952 int 953 cpufreq_register(device_t dev) 954 { 955 struct cpufreq_softc *sc; 956 device_t cf_dev, cpu_dev; 957 958 /* Add a sysctl to get each driver's settings separately. */ 959 SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev), 960 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), 961 OID_AUTO, "freq_settings", CTLTYPE_STRING | CTLFLAG_RD, dev, 0, 962 cpufreq_settings_sysctl, "A", "CPU frequency driver settings"); 963 964 /* 965 * Add only one cpufreq device to each CPU. Currently, all CPUs 966 * must offer the same levels and be switched at the same time. 967 */ 968 cpu_dev = device_get_parent(dev); 969 if ((cf_dev = device_find_child(cpu_dev, "cpufreq", -1))) { 970 sc = device_get_softc(cf_dev); 971 sc->max_mhz = CPUFREQ_VAL_UNKNOWN; 972 return (0); 973 } 974 975 /* Add the child device and possibly sysctls. */ 976 cf_dev = BUS_ADD_CHILD(cpu_dev, 0, "cpufreq", -1); 977 if (cf_dev == NULL) 978 return (ENOMEM); 979 device_quiet(cf_dev); 980 981 return (device_probe_and_attach(cf_dev)); 982 } 983 984 int 985 cpufreq_unregister(device_t dev) 986 { 987 device_t cf_dev, *devs; 988 int cfcount, devcount, error, i, type; 989 990 /* 991 * If this is the last cpufreq child device, remove the control 992 * device as well. We identify cpufreq children by calling a method 993 * they support. 994 */ 995 error = device_get_children(device_get_parent(dev), &devs, &devcount); 996 if (error) 997 return (error); 998 cf_dev = device_find_child(device_get_parent(dev), "cpufreq", -1); 999 if (cf_dev == NULL) { 1000 device_printf(dev, 1001 "warning: cpufreq_unregister called with no cpufreq device active\n"); 1002 return (0); 1003 } 1004 cfcount = 0; 1005 for (i = 0; i < devcount; i++) { 1006 if (!device_is_attached(devs[i])) 1007 continue; 1008 if (CPUFREQ_DRV_TYPE(devs[i], &type) == 0) 1009 cfcount++; 1010 } 1011 if (cfcount <= 1) 1012 device_delete_child(device_get_parent(cf_dev), cf_dev); 1013 free(devs, M_TEMP); 1014 1015 return (0); 1016 } 1017