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) 2004-2007 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/sbuf.h> 41 #include <sys/sched.h> 42 #include <sys/smp.h> 43 #include <sys/sysctl.h> 44 #include <sys/systm.h> 45 #include <sys/sx.h> 46 #include <sys/timetc.h> 47 #include <sys/taskqueue.h> 48 49 #include "cpufreq_if.h" 50 51 /* 52 * Common CPU frequency glue code. Drivers for specific hardware can 53 * attach this interface to allow users to get/set the CPU frequency. 54 */ 55 56 /* 57 * Number of levels we can handle. Levels are synthesized from settings 58 * so for M settings and N drivers, there may be M*N levels. 59 */ 60 #define CF_MAX_LEVELS 64 61 62 struct cf_saved_freq { 63 struct cf_level level; 64 int priority; 65 SLIST_ENTRY(cf_saved_freq) link; 66 }; 67 68 struct cpufreq_softc { 69 struct sx lock; 70 struct cf_level curr_level; 71 int curr_priority; 72 SLIST_HEAD(, cf_saved_freq) saved_freq; 73 struct cf_level_lst all_levels; 74 int all_count; 75 int max_mhz; 76 device_t dev; 77 struct sysctl_ctx_list sysctl_ctx; 78 struct task startup_task; 79 }; 80 81 struct cf_setting_array { 82 struct cf_setting sets[MAX_SETTINGS]; 83 int count; 84 TAILQ_ENTRY(cf_setting_array) link; 85 }; 86 87 TAILQ_HEAD(cf_setting_lst, cf_setting_array); 88 89 #define CF_MTX_INIT(x) sx_init((x), "cpufreq lock") 90 #define CF_MTX_LOCK(x) sx_xlock((x)) 91 #define CF_MTX_UNLOCK(x) sx_xunlock((x)) 92 #define CF_MTX_ASSERT(x) sx_assert((x), SX_XLOCKED) 93 94 #define CF_DEBUG(msg...) do { \ 95 if (cf_verbose) \ 96 printf("cpufreq: " msg); \ 97 } while (0) 98 99 static int cpufreq_attach(device_t dev); 100 static void cpufreq_startup_task(void *ctx, int pending); 101 static int cpufreq_detach(device_t dev); 102 static int cf_set_method(device_t dev, const struct cf_level *level, 103 int priority); 104 static int cf_get_method(device_t dev, struct cf_level *level); 105 static int cf_levels_method(device_t dev, struct cf_level *levels, 106 int *count); 107 static int cpufreq_insert_abs(struct cpufreq_softc *sc, 108 struct cf_setting *sets, int count); 109 static int cpufreq_expand_set(struct cpufreq_softc *sc, 110 struct cf_setting_array *set_arr); 111 static struct cf_level *cpufreq_dup_set(struct cpufreq_softc *sc, 112 struct cf_level *dup, struct cf_setting *set); 113 static int cpufreq_curr_sysctl(SYSCTL_HANDLER_ARGS); 114 static int cpufreq_levels_sysctl(SYSCTL_HANDLER_ARGS); 115 static int cpufreq_settings_sysctl(SYSCTL_HANDLER_ARGS); 116 117 static device_method_t cpufreq_methods[] = { 118 DEVMETHOD(device_probe, bus_generic_probe), 119 DEVMETHOD(device_attach, cpufreq_attach), 120 DEVMETHOD(device_detach, cpufreq_detach), 121 122 DEVMETHOD(cpufreq_set, cf_set_method), 123 DEVMETHOD(cpufreq_get, cf_get_method), 124 DEVMETHOD(cpufreq_levels, cf_levels_method), 125 {0, 0} 126 }; 127 static driver_t cpufreq_driver = { 128 "cpufreq", cpufreq_methods, sizeof(struct cpufreq_softc) 129 }; 130 static devclass_t cpufreq_dc; 131 DRIVER_MODULE(cpufreq, cpu, cpufreq_driver, cpufreq_dc, 0, 0); 132 133 static int cf_lowest_freq; 134 static int cf_verbose; 135 TUNABLE_INT("debug.cpufreq.lowest", &cf_lowest_freq); 136 TUNABLE_INT("debug.cpufreq.verbose", &cf_verbose); 137 SYSCTL_NODE(_debug, OID_AUTO, cpufreq, CTLFLAG_RD, NULL, "cpufreq debugging"); 138 SYSCTL_INT(_debug_cpufreq, OID_AUTO, lowest, CTLFLAG_RW, &cf_lowest_freq, 1, 139 "Don't provide levels below this frequency."); 140 SYSCTL_INT(_debug_cpufreq, OID_AUTO, verbose, CTLFLAG_RW, &cf_verbose, 1, 141 "Print verbose debugging messages"); 142 143 static int 144 cpufreq_attach(device_t dev) 145 { 146 struct cpufreq_softc *sc; 147 device_t parent; 148 int numdevs; 149 150 CF_DEBUG("initializing %s\n", device_get_nameunit(dev)); 151 sc = device_get_softc(dev); 152 parent = device_get_parent(dev); 153 sc->dev = dev; 154 sysctl_ctx_init(&sc->sysctl_ctx); 155 TAILQ_INIT(&sc->all_levels); 156 CF_MTX_INIT(&sc->lock); 157 sc->curr_level.total_set.freq = CPUFREQ_VAL_UNKNOWN; 158 SLIST_INIT(&sc->saved_freq); 159 sc->max_mhz = CPUFREQ_VAL_UNKNOWN; 160 161 /* 162 * Only initialize one set of sysctls for all CPUs. In the future, 163 * if multiple CPUs can have different settings, we can move these 164 * sysctls to be under every CPU instead of just the first one. 165 */ 166 numdevs = devclass_get_count(cpufreq_dc); 167 if (numdevs > 1) 168 return (0); 169 170 CF_DEBUG("initializing one-time data for %s\n", 171 device_get_nameunit(dev)); 172 SYSCTL_ADD_PROC(&sc->sysctl_ctx, 173 SYSCTL_CHILDREN(device_get_sysctl_tree(parent)), 174 OID_AUTO, "freq", CTLTYPE_INT | CTLFLAG_RW, sc, 0, 175 cpufreq_curr_sysctl, "I", "Current CPU frequency"); 176 SYSCTL_ADD_PROC(&sc->sysctl_ctx, 177 SYSCTL_CHILDREN(device_get_sysctl_tree(parent)), 178 OID_AUTO, "freq_levels", CTLTYPE_STRING | CTLFLAG_RD, sc, 0, 179 cpufreq_levels_sysctl, "A", "CPU frequency levels"); 180 181 /* 182 * Queue a one-shot broadcast that levels have changed. 183 * It will run once the system has completed booting. 184 */ 185 TASK_INIT(&sc->startup_task, 0, cpufreq_startup_task, dev); 186 taskqueue_enqueue(taskqueue_thread, &sc->startup_task); 187 188 return (0); 189 } 190 191 /* Handle any work to be done for all drivers that attached during boot. */ 192 static void 193 cpufreq_startup_task(void *ctx, int pending) 194 { 195 196 cpufreq_settings_changed((device_t)ctx); 197 } 198 199 static int 200 cpufreq_detach(device_t dev) 201 { 202 struct cpufreq_softc *sc; 203 struct cf_saved_freq *saved_freq; 204 int numdevs; 205 206 CF_DEBUG("shutdown %s\n", device_get_nameunit(dev)); 207 sc = device_get_softc(dev); 208 sysctl_ctx_free(&sc->sysctl_ctx); 209 210 while ((saved_freq = SLIST_FIRST(&sc->saved_freq)) != NULL) { 211 SLIST_REMOVE_HEAD(&sc->saved_freq, link); 212 free(saved_freq, M_TEMP); 213 } 214 215 /* Only clean up these resources when the last device is detaching. */ 216 numdevs = devclass_get_count(cpufreq_dc); 217 if (numdevs == 1) { 218 CF_DEBUG("final shutdown for %s\n", device_get_nameunit(dev)); 219 } 220 221 return (0); 222 } 223 224 static int 225 cf_set_method(device_t dev, const struct cf_level *level, int priority) 226 { 227 struct cpufreq_softc *sc; 228 const struct cf_setting *set; 229 struct cf_saved_freq *saved_freq, *curr_freq; 230 struct pcpu *pc; 231 int error, i; 232 233 sc = device_get_softc(dev); 234 error = 0; 235 set = NULL; 236 saved_freq = NULL; 237 238 /* We are going to change levels so notify the pre-change handler. */ 239 EVENTHANDLER_INVOKE(cpufreq_pre_change, level, &error); 240 if (error != 0) { 241 EVENTHANDLER_INVOKE(cpufreq_post_change, level, error); 242 return (error); 243 } 244 245 CF_MTX_LOCK(&sc->lock); 246 247 #ifdef SMP 248 /* 249 * If still booting and secondary CPUs not started yet, don't allow 250 * changing the frequency until they're online. This is because we 251 * can't switch to them using sched_bind() and thus we'd only be 252 * switching the main CPU. XXXTODO: Need to think more about how to 253 * handle having different CPUs at different frequencies. 254 */ 255 if (mp_ncpus > 1 && !smp_active) { 256 device_printf(dev, "rejecting change, SMP not started yet\n"); 257 error = ENXIO; 258 goto out; 259 } 260 #endif /* SMP */ 261 262 /* 263 * If the requested level has a lower priority, don't allow 264 * the new level right now. 265 */ 266 if (priority < sc->curr_priority) { 267 CF_DEBUG("ignoring, curr prio %d less than %d\n", priority, 268 sc->curr_priority); 269 error = EPERM; 270 goto out; 271 } 272 273 /* 274 * If the caller didn't specify a level and one is saved, prepare to 275 * restore the saved level. If none has been saved, return an error. 276 */ 277 if (level == NULL) { 278 saved_freq = SLIST_FIRST(&sc->saved_freq); 279 if (saved_freq == NULL) { 280 CF_DEBUG("NULL level, no saved level\n"); 281 error = ENXIO; 282 goto out; 283 } 284 level = &saved_freq->level; 285 priority = saved_freq->priority; 286 CF_DEBUG("restoring saved level, freq %d prio %d\n", 287 level->total_set.freq, priority); 288 } 289 290 /* Reject levels that are below our specified threshold. */ 291 if (level->total_set.freq < cf_lowest_freq) { 292 CF_DEBUG("rejecting freq %d, less than %d limit\n", 293 level->total_set.freq, cf_lowest_freq); 294 error = EINVAL; 295 goto out; 296 } 297 298 /* If already at this level, just return. */ 299 if (CPUFREQ_CMP(sc->curr_level.total_set.freq, level->total_set.freq)) { 300 CF_DEBUG("skipping freq %d, same as current level %d\n", 301 level->total_set.freq, sc->curr_level.total_set.freq); 302 goto skip; 303 } 304 305 /* First, set the absolute frequency via its driver. */ 306 set = &level->abs_set; 307 if (set->dev) { 308 if (!device_is_attached(set->dev)) { 309 error = ENXIO; 310 goto out; 311 } 312 313 /* Bind to the target CPU before switching. */ 314 pc = cpu_get_pcpu(set->dev); 315 thread_lock(curthread); 316 sched_bind(curthread, pc->pc_cpuid); 317 thread_unlock(curthread); 318 CF_DEBUG("setting abs freq %d on %s (cpu %d)\n", set->freq, 319 device_get_nameunit(set->dev), PCPU_GET(cpuid)); 320 error = CPUFREQ_DRV_SET(set->dev, set); 321 thread_lock(curthread); 322 sched_unbind(curthread); 323 thread_unlock(curthread); 324 if (error) { 325 goto out; 326 } 327 } 328 329 /* Next, set any/all relative frequencies via their drivers. */ 330 for (i = 0; i < level->rel_count; i++) { 331 set = &level->rel_set[i]; 332 if (!device_is_attached(set->dev)) { 333 error = ENXIO; 334 goto out; 335 } 336 337 /* Bind to the target CPU before switching. */ 338 pc = cpu_get_pcpu(set->dev); 339 thread_lock(curthread); 340 sched_bind(curthread, pc->pc_cpuid); 341 thread_unlock(curthread); 342 CF_DEBUG("setting rel freq %d on %s (cpu %d)\n", set->freq, 343 device_get_nameunit(set->dev), PCPU_GET(cpuid)); 344 error = CPUFREQ_DRV_SET(set->dev, set); 345 thread_lock(curthread); 346 sched_unbind(curthread); 347 thread_unlock(curthread); 348 if (error) { 349 /* XXX Back out any successful setting? */ 350 goto out; 351 } 352 } 353 354 skip: 355 /* 356 * Before recording the current level, check if we're going to a 357 * higher priority. If so, save the previous level and priority. 358 */ 359 if (sc->curr_level.total_set.freq != CPUFREQ_VAL_UNKNOWN && 360 priority > sc->curr_priority) { 361 CF_DEBUG("saving level, freq %d prio %d\n", 362 sc->curr_level.total_set.freq, sc->curr_priority); 363 curr_freq = malloc(sizeof(*curr_freq), M_TEMP, M_NOWAIT); 364 if (curr_freq == NULL) { 365 error = ENOMEM; 366 goto out; 367 } 368 curr_freq->level = sc->curr_level; 369 curr_freq->priority = sc->curr_priority; 370 SLIST_INSERT_HEAD(&sc->saved_freq, curr_freq, link); 371 } 372 sc->curr_level = *level; 373 sc->curr_priority = priority; 374 375 /* If we were restoring a saved state, reset it to "unused". */ 376 if (saved_freq != NULL) { 377 CF_DEBUG("resetting saved level\n"); 378 sc->curr_level.total_set.freq = CPUFREQ_VAL_UNKNOWN; 379 SLIST_REMOVE_HEAD(&sc->saved_freq, link); 380 free(saved_freq, M_TEMP); 381 } 382 383 out: 384 CF_MTX_UNLOCK(&sc->lock); 385 386 /* 387 * We changed levels (or attempted to) so notify the post-change 388 * handler of new frequency or error. 389 */ 390 EVENTHANDLER_INVOKE(cpufreq_post_change, level, error); 391 if (error && set) 392 device_printf(set->dev, "set freq failed, err %d\n", error); 393 394 return (error); 395 } 396 397 static int 398 cf_get_method(device_t dev, struct cf_level *level) 399 { 400 struct cpufreq_softc *sc; 401 struct cf_level *levels; 402 struct cf_setting *curr_set, set; 403 struct pcpu *pc; 404 device_t *devs; 405 int count, error, i, n, numdevs; 406 uint64_t rate; 407 408 sc = device_get_softc(dev); 409 error = 0; 410 levels = NULL; 411 412 /* If we already know the current frequency, we're done. */ 413 CF_MTX_LOCK(&sc->lock); 414 curr_set = &sc->curr_level.total_set; 415 if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) { 416 CF_DEBUG("get returning known freq %d\n", curr_set->freq); 417 goto out; 418 } 419 CF_MTX_UNLOCK(&sc->lock); 420 421 /* 422 * We need to figure out the current level. Loop through every 423 * driver, getting the current setting. Then, attempt to get a best 424 * match of settings against each level. 425 */ 426 count = CF_MAX_LEVELS; 427 levels = malloc(count * sizeof(*levels), M_TEMP, M_NOWAIT); 428 if (levels == NULL) 429 return (ENOMEM); 430 error = CPUFREQ_LEVELS(sc->dev, levels, &count); 431 if (error) { 432 if (error == E2BIG) 433 printf("cpufreq: need to increase CF_MAX_LEVELS\n"); 434 free(levels, M_TEMP); 435 return (error); 436 } 437 error = device_get_children(device_get_parent(dev), &devs, &numdevs); 438 if (error) { 439 free(levels, M_TEMP); 440 return (error); 441 } 442 443 /* 444 * Reacquire the lock and search for the given level. 445 * 446 * XXX Note: this is not quite right since we really need to go 447 * through each level and compare both absolute and relative 448 * settings for each driver in the system before making a match. 449 * The estimation code below catches this case though. 450 */ 451 CF_MTX_LOCK(&sc->lock); 452 for (n = 0; n < numdevs && curr_set->freq == CPUFREQ_VAL_UNKNOWN; n++) { 453 if (!device_is_attached(devs[n])) 454 continue; 455 if (CPUFREQ_DRV_GET(devs[n], &set) != 0) 456 continue; 457 for (i = 0; i < count; i++) { 458 if (CPUFREQ_CMP(set.freq, levels[i].total_set.freq)) { 459 sc->curr_level = levels[i]; 460 break; 461 } 462 } 463 } 464 free(devs, M_TEMP); 465 if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) { 466 CF_DEBUG("get matched freq %d from drivers\n", curr_set->freq); 467 goto out; 468 } 469 470 /* 471 * We couldn't find an exact match, so attempt to estimate and then 472 * match against a level. 473 */ 474 pc = cpu_get_pcpu(dev); 475 if (pc == NULL) { 476 error = ENXIO; 477 goto out; 478 } 479 cpu_est_clockrate(pc->pc_cpuid, &rate); 480 rate /= 1000000; 481 for (i = 0; i < count; i++) { 482 if (CPUFREQ_CMP(rate, levels[i].total_set.freq)) { 483 sc->curr_level = levels[i]; 484 CF_DEBUG("get estimated freq %d\n", curr_set->freq); 485 goto out; 486 } 487 } 488 error = ENXIO; 489 490 out: 491 if (error == 0) 492 *level = sc->curr_level; 493 494 CF_MTX_UNLOCK(&sc->lock); 495 if (levels) 496 free(levels, M_TEMP); 497 return (error); 498 } 499 500 static int 501 cf_levels_method(device_t dev, struct cf_level *levels, int *count) 502 { 503 struct cf_setting_array *set_arr; 504 struct cf_setting_lst rel_sets; 505 struct cpufreq_softc *sc; 506 struct cf_level *lev; 507 struct cf_setting *sets; 508 struct pcpu *pc; 509 device_t *devs; 510 int error, i, numdevs, set_count, type; 511 uint64_t rate; 512 513 if (levels == NULL || count == NULL) 514 return (EINVAL); 515 516 TAILQ_INIT(&rel_sets); 517 sc = device_get_softc(dev); 518 error = device_get_children(device_get_parent(dev), &devs, &numdevs); 519 if (error) 520 return (error); 521 sets = malloc(MAX_SETTINGS * sizeof(*sets), M_TEMP, M_NOWAIT); 522 if (sets == NULL) { 523 free(devs, M_TEMP); 524 return (ENOMEM); 525 } 526 527 /* Get settings from all cpufreq drivers. */ 528 CF_MTX_LOCK(&sc->lock); 529 for (i = 0; i < numdevs; i++) { 530 /* Skip devices that aren't ready. */ 531 if (!device_is_attached(devs[i])) 532 continue; 533 534 /* 535 * Get settings, skipping drivers that offer no settings or 536 * provide settings for informational purposes only. 537 */ 538 error = CPUFREQ_DRV_TYPE(devs[i], &type); 539 if (error || (type & CPUFREQ_FLAG_INFO_ONLY)) { 540 if (error == 0) { 541 CF_DEBUG("skipping info-only driver %s\n", 542 device_get_nameunit(devs[i])); 543 } 544 continue; 545 } 546 set_count = MAX_SETTINGS; 547 error = CPUFREQ_DRV_SETTINGS(devs[i], sets, &set_count); 548 if (error || set_count == 0) 549 continue; 550 551 /* Add the settings to our absolute/relative lists. */ 552 switch (type & CPUFREQ_TYPE_MASK) { 553 case CPUFREQ_TYPE_ABSOLUTE: 554 error = cpufreq_insert_abs(sc, sets, set_count); 555 break; 556 case CPUFREQ_TYPE_RELATIVE: 557 CF_DEBUG("adding %d relative settings\n", set_count); 558 set_arr = malloc(sizeof(*set_arr), M_TEMP, M_NOWAIT); 559 if (set_arr == NULL) { 560 error = ENOMEM; 561 goto out; 562 } 563 bcopy(sets, set_arr->sets, set_count * sizeof(*sets)); 564 set_arr->count = set_count; 565 TAILQ_INSERT_TAIL(&rel_sets, set_arr, link); 566 break; 567 default: 568 error = EINVAL; 569 } 570 if (error) 571 goto out; 572 } 573 574 /* 575 * If there are no absolute levels, create a fake one at 100%. We 576 * then cache the clockrate for later use as our base frequency. 577 * 578 * XXX This assumes that the first time through, if we only have 579 * relative drivers, the CPU is currently running at 100%. 580 */ 581 if (TAILQ_EMPTY(&sc->all_levels)) { 582 if (sc->max_mhz == CPUFREQ_VAL_UNKNOWN) { 583 pc = cpu_get_pcpu(dev); 584 cpu_est_clockrate(pc->pc_cpuid, &rate); 585 sc->max_mhz = rate / 1000000; 586 } 587 memset(&sets[0], CPUFREQ_VAL_UNKNOWN, sizeof(*sets)); 588 sets[0].freq = sc->max_mhz; 589 sets[0].dev = NULL; 590 error = cpufreq_insert_abs(sc, sets, 1); 591 if (error) 592 goto out; 593 } 594 595 /* Create a combined list of absolute + relative levels. */ 596 TAILQ_FOREACH(set_arr, &rel_sets, link) 597 cpufreq_expand_set(sc, set_arr); 598 599 /* If the caller doesn't have enough space, return the actual count. */ 600 if (sc->all_count > *count) { 601 *count = sc->all_count; 602 error = E2BIG; 603 goto out; 604 } 605 606 /* Finally, output the list of levels. */ 607 i = 0; 608 TAILQ_FOREACH(lev, &sc->all_levels, link) { 609 /* 610 * Skip levels that are too close in frequency to the 611 * previous levels. Some systems report bogus duplicate 612 * settings (i.e., for acpi_perf). 613 */ 614 if (i > 0 && CPUFREQ_CMP(lev->total_set.freq, 615 levels[i - 1].total_set.freq)) { 616 sc->all_count--; 617 continue; 618 } 619 620 /* Skip levels that have a frequency that is too low. */ 621 if (lev->total_set.freq < cf_lowest_freq) { 622 sc->all_count--; 623 continue; 624 } 625 626 levels[i] = *lev; 627 i++; 628 } 629 *count = sc->all_count; 630 error = 0; 631 632 out: 633 /* Clear all levels since we regenerate them each time. */ 634 while ((lev = TAILQ_FIRST(&sc->all_levels)) != NULL) { 635 TAILQ_REMOVE(&sc->all_levels, lev, link); 636 free(lev, M_TEMP); 637 } 638 sc->all_count = 0; 639 640 CF_MTX_UNLOCK(&sc->lock); 641 while ((set_arr = TAILQ_FIRST(&rel_sets)) != NULL) { 642 TAILQ_REMOVE(&rel_sets, set_arr, link); 643 free(set_arr, M_TEMP); 644 } 645 free(devs, M_TEMP); 646 free(sets, M_TEMP); 647 return (error); 648 } 649 650 /* 651 * Create levels for an array of absolute settings and insert them in 652 * sorted order in the specified list. 653 */ 654 static int 655 cpufreq_insert_abs(struct cpufreq_softc *sc, struct cf_setting *sets, 656 int count) 657 { 658 struct cf_level_lst *list; 659 struct cf_level *level, *search; 660 int i; 661 662 CF_MTX_ASSERT(&sc->lock); 663 664 list = &sc->all_levels; 665 for (i = 0; i < count; i++) { 666 level = malloc(sizeof(*level), M_TEMP, M_NOWAIT | M_ZERO); 667 if (level == NULL) 668 return (ENOMEM); 669 level->abs_set = sets[i]; 670 level->total_set = sets[i]; 671 level->total_set.dev = NULL; 672 sc->all_count++; 673 674 if (TAILQ_EMPTY(list)) { 675 CF_DEBUG("adding abs setting %d at head\n", 676 sets[i].freq); 677 TAILQ_INSERT_HEAD(list, level, link); 678 continue; 679 } 680 681 TAILQ_FOREACH_REVERSE(search, list, cf_level_lst, link) { 682 if (sets[i].freq <= search->total_set.freq) { 683 CF_DEBUG("adding abs setting %d after %d\n", 684 sets[i].freq, search->total_set.freq); 685 TAILQ_INSERT_AFTER(list, search, level, link); 686 break; 687 } 688 } 689 } 690 return (0); 691 } 692 693 /* 694 * Expand a group of relative settings, creating derived levels from them. 695 */ 696 static int 697 cpufreq_expand_set(struct cpufreq_softc *sc, struct cf_setting_array *set_arr) 698 { 699 struct cf_level *fill, *search; 700 struct cf_setting *set; 701 int i; 702 703 CF_MTX_ASSERT(&sc->lock); 704 705 /* 706 * Walk the set of all existing levels in reverse. This is so we 707 * create derived states from the lowest absolute settings first 708 * and discard duplicates created from higher absolute settings. 709 * For instance, a level of 50 Mhz derived from 100 Mhz + 50% is 710 * preferable to 200 Mhz + 25% because absolute settings are more 711 * efficient since they often change the voltage as well. 712 */ 713 TAILQ_FOREACH_REVERSE(search, &sc->all_levels, cf_level_lst, link) { 714 /* Add each setting to the level, duplicating if necessary. */ 715 for (i = 0; i < set_arr->count; i++) { 716 set = &set_arr->sets[i]; 717 718 /* 719 * If this setting is less than 100%, split the level 720 * into two and add this setting to the new level. 721 */ 722 fill = search; 723 if (set->freq < 10000) { 724 fill = cpufreq_dup_set(sc, search, set); 725 726 /* 727 * The new level was a duplicate of an existing 728 * level or its absolute setting is too high 729 * so we freed it. For example, we discard a 730 * derived level of 1000 MHz/25% if a level 731 * of 500 MHz/100% already exists. 732 */ 733 if (fill == NULL) 734 break; 735 } 736 737 /* Add this setting to the existing or new level. */ 738 KASSERT(fill->rel_count < MAX_SETTINGS, 739 ("cpufreq: too many relative drivers (%d)", 740 MAX_SETTINGS)); 741 fill->rel_set[fill->rel_count] = *set; 742 fill->rel_count++; 743 CF_DEBUG( 744 "expand set added rel setting %d%% to %d level\n", 745 set->freq / 100, fill->total_set.freq); 746 } 747 } 748 749 return (0); 750 } 751 752 static struct cf_level * 753 cpufreq_dup_set(struct cpufreq_softc *sc, struct cf_level *dup, 754 struct cf_setting *set) 755 { 756 struct cf_level_lst *list; 757 struct cf_level *fill, *itr; 758 struct cf_setting *fill_set, *itr_set; 759 int i; 760 761 CF_MTX_ASSERT(&sc->lock); 762 763 /* 764 * Create a new level, copy it from the old one, and update the 765 * total frequency and power by the percentage specified in the 766 * relative setting. 767 */ 768 fill = malloc(sizeof(*fill), M_TEMP, M_NOWAIT); 769 if (fill == NULL) 770 return (NULL); 771 *fill = *dup; 772 fill_set = &fill->total_set; 773 fill_set->freq = 774 ((uint64_t)fill_set->freq * set->freq) / 10000; 775 if (fill_set->power != CPUFREQ_VAL_UNKNOWN) { 776 fill_set->power = ((uint64_t)fill_set->power * set->freq) 777 / 10000; 778 } 779 if (set->lat != CPUFREQ_VAL_UNKNOWN) { 780 if (fill_set->lat != CPUFREQ_VAL_UNKNOWN) 781 fill_set->lat += set->lat; 782 else 783 fill_set->lat = set->lat; 784 } 785 CF_DEBUG("dup set considering derived setting %d\n", fill_set->freq); 786 787 /* 788 * If we copied an old level that we already modified (say, at 100%), 789 * we need to remove that setting before adding this one. Since we 790 * process each setting array in order, we know any settings for this 791 * driver will be found at the end. 792 */ 793 for (i = fill->rel_count; i != 0; i--) { 794 if (fill->rel_set[i - 1].dev != set->dev) 795 break; 796 CF_DEBUG("removed last relative driver: %s\n", 797 device_get_nameunit(set->dev)); 798 fill->rel_count--; 799 } 800 801 /* 802 * Insert the new level in sorted order. If it is a duplicate of an 803 * existing level (1) or has an absolute setting higher than the 804 * existing level (2), do not add it. We can do this since any such 805 * level is guaranteed use less power. For example (1), a level with 806 * one absolute setting of 800 Mhz uses less power than one composed 807 * of an absolute setting of 1600 Mhz and a relative setting at 50%. 808 * Also for example (2), a level of 800 Mhz/75% is preferable to 809 * 1600 Mhz/25% even though the latter has a lower total frequency. 810 */ 811 list = &sc->all_levels; 812 KASSERT(!TAILQ_EMPTY(list), ("all levels list empty in dup set")); 813 TAILQ_FOREACH_REVERSE(itr, list, cf_level_lst, link) { 814 itr_set = &itr->total_set; 815 if (CPUFREQ_CMP(fill_set->freq, itr_set->freq)) { 816 CF_DEBUG("dup set rejecting %d (dupe)\n", 817 fill_set->freq); 818 itr = NULL; 819 break; 820 } else if (fill_set->freq < itr_set->freq) { 821 if (fill->abs_set.freq <= itr->abs_set.freq) { 822 CF_DEBUG( 823 "dup done, inserting new level %d after %d\n", 824 fill_set->freq, itr_set->freq); 825 TAILQ_INSERT_AFTER(list, itr, fill, link); 826 sc->all_count++; 827 } else { 828 CF_DEBUG("dup set rejecting %d (abs too big)\n", 829 fill_set->freq); 830 itr = NULL; 831 } 832 break; 833 } 834 } 835 836 /* We didn't find a good place for this new level so free it. */ 837 if (itr == NULL) { 838 CF_DEBUG("dup set freeing new level %d (not optimal)\n", 839 fill_set->freq); 840 free(fill, M_TEMP); 841 fill = NULL; 842 } 843 844 return (fill); 845 } 846 847 static int 848 cpufreq_curr_sysctl(SYSCTL_HANDLER_ARGS) 849 { 850 struct cpufreq_softc *sc; 851 struct cf_level *levels; 852 int count, devcount, error, freq, i, n; 853 device_t *devs; 854 855 devs = NULL; 856 sc = oidp->oid_arg1; 857 levels = malloc(CF_MAX_LEVELS * sizeof(*levels), M_TEMP, M_NOWAIT); 858 if (levels == NULL) 859 return (ENOMEM); 860 861 error = CPUFREQ_GET(sc->dev, &levels[0]); 862 if (error) 863 goto out; 864 freq = levels[0].total_set.freq; 865 error = sysctl_handle_int(oidp, &freq, 0, req); 866 if (error != 0 || req->newptr == NULL) 867 goto out; 868 869 /* 870 * While we only call cpufreq_get() on one device (assuming all 871 * CPUs have equal levels), we call cpufreq_set() on all CPUs. 872 * This is needed for some MP systems. 873 */ 874 error = devclass_get_devices(cpufreq_dc, &devs, &devcount); 875 if (error) 876 goto out; 877 for (n = 0; n < devcount; n++) { 878 count = CF_MAX_LEVELS; 879 error = CPUFREQ_LEVELS(devs[n], levels, &count); 880 if (error) { 881 if (error == E2BIG) 882 printf( 883 "cpufreq: need to increase CF_MAX_LEVELS\n"); 884 break; 885 } 886 for (i = 0; i < count; i++) { 887 if (CPUFREQ_CMP(levels[i].total_set.freq, freq)) { 888 error = CPUFREQ_SET(devs[n], &levels[i], 889 CPUFREQ_PRIO_USER); 890 break; 891 } 892 } 893 if (i == count) { 894 error = EINVAL; 895 break; 896 } 897 } 898 899 out: 900 if (devs) 901 free(devs, M_TEMP); 902 if (levels) 903 free(levels, M_TEMP); 904 return (error); 905 } 906 907 static int 908 cpufreq_levels_sysctl(SYSCTL_HANDLER_ARGS) 909 { 910 struct cpufreq_softc *sc; 911 struct cf_level *levels; 912 struct cf_setting *set; 913 struct sbuf sb; 914 int count, error, i; 915 916 sc = oidp->oid_arg1; 917 sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND); 918 919 /* Get settings from the device and generate the output string. */ 920 count = CF_MAX_LEVELS; 921 levels = malloc(count * sizeof(*levels), M_TEMP, M_NOWAIT); 922 if (levels == NULL) 923 return (ENOMEM); 924 error = CPUFREQ_LEVELS(sc->dev, levels, &count); 925 if (error) { 926 if (error == E2BIG) 927 printf("cpufreq: need to increase CF_MAX_LEVELS\n"); 928 goto out; 929 } 930 if (count) { 931 for (i = 0; i < count; i++) { 932 set = &levels[i].total_set; 933 sbuf_printf(&sb, "%d/%d ", set->freq, set->power); 934 } 935 } else 936 sbuf_cpy(&sb, ""); 937 sbuf_trim(&sb); 938 sbuf_finish(&sb); 939 error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req); 940 941 out: 942 free(levels, M_TEMP); 943 sbuf_delete(&sb); 944 return (error); 945 } 946 947 static int 948 cpufreq_settings_sysctl(SYSCTL_HANDLER_ARGS) 949 { 950 device_t dev; 951 struct cf_setting *sets; 952 struct sbuf sb; 953 int error, i, set_count; 954 955 dev = oidp->oid_arg1; 956 sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND); 957 958 /* Get settings from the device and generate the output string. */ 959 set_count = MAX_SETTINGS; 960 sets = malloc(set_count * sizeof(*sets), M_TEMP, M_NOWAIT); 961 if (sets == NULL) 962 return (ENOMEM); 963 error = CPUFREQ_DRV_SETTINGS(dev, sets, &set_count); 964 if (error) 965 goto out; 966 if (set_count) { 967 for (i = 0; i < set_count; i++) 968 sbuf_printf(&sb, "%d/%d ", sets[i].freq, sets[i].power); 969 } else 970 sbuf_cpy(&sb, ""); 971 sbuf_trim(&sb); 972 sbuf_finish(&sb); 973 error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req); 974 975 out: 976 free(sets, M_TEMP); 977 sbuf_delete(&sb); 978 return (error); 979 } 980 981 int 982 cpufreq_register(device_t dev) 983 { 984 struct cpufreq_softc *sc; 985 device_t cf_dev, cpu_dev; 986 987 /* Add a sysctl to get each driver's settings separately. */ 988 SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev), 989 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), 990 OID_AUTO, "freq_settings", CTLTYPE_STRING | CTLFLAG_RD, dev, 0, 991 cpufreq_settings_sysctl, "A", "CPU frequency driver settings"); 992 993 /* 994 * Add only one cpufreq device to each CPU. Currently, all CPUs 995 * must offer the same levels and be switched at the same time. 996 */ 997 cpu_dev = device_get_parent(dev); 998 if ((cf_dev = device_find_child(cpu_dev, "cpufreq", -1))) { 999 sc = device_get_softc(cf_dev); 1000 sc->max_mhz = CPUFREQ_VAL_UNKNOWN; 1001 return (0); 1002 } 1003 1004 /* Add the child device and possibly sysctls. */ 1005 cf_dev = BUS_ADD_CHILD(cpu_dev, 0, "cpufreq", -1); 1006 if (cf_dev == NULL) 1007 return (ENOMEM); 1008 device_quiet(cf_dev); 1009 1010 return (device_probe_and_attach(cf_dev)); 1011 } 1012 1013 int 1014 cpufreq_unregister(device_t dev) 1015 { 1016 device_t cf_dev, *devs; 1017 int cfcount, devcount, error, i, type; 1018 1019 /* 1020 * If this is the last cpufreq child device, remove the control 1021 * device as well. We identify cpufreq children by calling a method 1022 * they support. 1023 */ 1024 error = device_get_children(device_get_parent(dev), &devs, &devcount); 1025 if (error) 1026 return (error); 1027 cf_dev = device_find_child(device_get_parent(dev), "cpufreq", -1); 1028 if (cf_dev == NULL) { 1029 device_printf(dev, 1030 "warning: cpufreq_unregister called with no cpufreq device active\n"); 1031 return (0); 1032 } 1033 cfcount = 0; 1034 for (i = 0; i < devcount; i++) { 1035 if (!device_is_attached(devs[i])) 1036 continue; 1037 if (CPUFREQ_DRV_TYPE(devs[i], &type) == 0) 1038 cfcount++; 1039 } 1040 if (cfcount <= 1) 1041 device_delete_child(device_get_parent(cf_dev), cf_dev); 1042 free(devs, M_TEMP); 1043 1044 return (0); 1045 } 1046 1047 int 1048 cpufreq_settings_changed(device_t dev) 1049 { 1050 1051 EVENTHANDLER_INVOKE(cpufreq_levels_changed, 1052 device_get_unit(device_get_parent(dev))); 1053 return (0); 1054 }
Cache object: e0727391071651e9a2c7b0dd9f66402f
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