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 struct pcpu *pc; 148 device_t parent; 149 uint64_t rate; 150 int numdevs; 151 152 CF_DEBUG("initializing %s\n", device_get_nameunit(dev)); 153 sc = device_get_softc(dev); 154 parent = device_get_parent(dev); 155 sc->dev = dev; 156 sysctl_ctx_init(&sc->sysctl_ctx); 157 TAILQ_INIT(&sc->all_levels); 158 CF_MTX_INIT(&sc->lock); 159 sc->curr_level.total_set.freq = CPUFREQ_VAL_UNKNOWN; 160 SLIST_INIT(&sc->saved_freq); 161 /* Try to get nominal CPU freq to use it as maximum later if needed */ 162 sc->max_mhz = cpu_get_nominal_mhz(dev); 163 /* If that fails, try to measure the current rate */ 164 if (sc->max_mhz <= 0) { 165 pc = cpu_get_pcpu(dev); 166 if (cpu_est_clockrate(pc->pc_cpuid, &rate) == 0) 167 sc->max_mhz = rate / 1000000; 168 else 169 sc->max_mhz = CPUFREQ_VAL_UNKNOWN; 170 } 171 172 /* 173 * Only initialize one set of sysctls for all CPUs. In the future, 174 * if multiple CPUs can have different settings, we can move these 175 * sysctls to be under every CPU instead of just the first one. 176 */ 177 numdevs = devclass_get_count(cpufreq_dc); 178 if (numdevs > 1) 179 return (0); 180 181 CF_DEBUG("initializing one-time data for %s\n", 182 device_get_nameunit(dev)); 183 SYSCTL_ADD_PROC(&sc->sysctl_ctx, 184 SYSCTL_CHILDREN(device_get_sysctl_tree(parent)), 185 OID_AUTO, "freq", CTLTYPE_INT | CTLFLAG_RW, sc, 0, 186 cpufreq_curr_sysctl, "I", "Current CPU frequency"); 187 SYSCTL_ADD_PROC(&sc->sysctl_ctx, 188 SYSCTL_CHILDREN(device_get_sysctl_tree(parent)), 189 OID_AUTO, "freq_levels", CTLTYPE_STRING | CTLFLAG_RD, sc, 0, 190 cpufreq_levels_sysctl, "A", "CPU frequency levels"); 191 192 /* 193 * Queue a one-shot broadcast that levels have changed. 194 * It will run once the system has completed booting. 195 */ 196 TASK_INIT(&sc->startup_task, 0, cpufreq_startup_task, dev); 197 taskqueue_enqueue(taskqueue_thread, &sc->startup_task); 198 199 return (0); 200 } 201 202 /* Handle any work to be done for all drivers that attached during boot. */ 203 static void 204 cpufreq_startup_task(void *ctx, int pending) 205 { 206 207 cpufreq_settings_changed((device_t)ctx); 208 } 209 210 static int 211 cpufreq_detach(device_t dev) 212 { 213 struct cpufreq_softc *sc; 214 struct cf_saved_freq *saved_freq; 215 int numdevs; 216 217 CF_DEBUG("shutdown %s\n", device_get_nameunit(dev)); 218 sc = device_get_softc(dev); 219 sysctl_ctx_free(&sc->sysctl_ctx); 220 221 while ((saved_freq = SLIST_FIRST(&sc->saved_freq)) != NULL) { 222 SLIST_REMOVE_HEAD(&sc->saved_freq, link); 223 free(saved_freq, M_TEMP); 224 } 225 226 /* Only clean up these resources when the last device is detaching. */ 227 numdevs = devclass_get_count(cpufreq_dc); 228 if (numdevs == 1) { 229 CF_DEBUG("final shutdown for %s\n", device_get_nameunit(dev)); 230 } 231 232 return (0); 233 } 234 235 static int 236 cf_set_method(device_t dev, const struct cf_level *level, int priority) 237 { 238 struct cpufreq_softc *sc; 239 const struct cf_setting *set; 240 struct cf_saved_freq *saved_freq, *curr_freq; 241 struct pcpu *pc; 242 int error, i; 243 244 sc = device_get_softc(dev); 245 error = 0; 246 set = NULL; 247 saved_freq = NULL; 248 249 /* We are going to change levels so notify the pre-change handler. */ 250 EVENTHANDLER_INVOKE(cpufreq_pre_change, level, &error); 251 if (error != 0) { 252 EVENTHANDLER_INVOKE(cpufreq_post_change, level, error); 253 return (error); 254 } 255 256 CF_MTX_LOCK(&sc->lock); 257 258 #ifdef SMP 259 /* 260 * If still booting and secondary CPUs not started yet, don't allow 261 * changing the frequency until they're online. This is because we 262 * can't switch to them using sched_bind() and thus we'd only be 263 * switching the main CPU. XXXTODO: Need to think more about how to 264 * handle having different CPUs at different frequencies. 265 */ 266 if (mp_ncpus > 1 && !smp_active) { 267 device_printf(dev, "rejecting change, SMP not started yet\n"); 268 error = ENXIO; 269 goto out; 270 } 271 #endif /* SMP */ 272 273 /* 274 * If the requested level has a lower priority, don't allow 275 * the new level right now. 276 */ 277 if (priority < sc->curr_priority) { 278 CF_DEBUG("ignoring, curr prio %d less than %d\n", priority, 279 sc->curr_priority); 280 error = EPERM; 281 goto out; 282 } 283 284 /* 285 * If the caller didn't specify a level and one is saved, prepare to 286 * restore the saved level. If none has been saved, return an error. 287 */ 288 if (level == NULL) { 289 saved_freq = SLIST_FIRST(&sc->saved_freq); 290 if (saved_freq == NULL) { 291 CF_DEBUG("NULL level, no saved level\n"); 292 error = ENXIO; 293 goto out; 294 } 295 level = &saved_freq->level; 296 priority = saved_freq->priority; 297 CF_DEBUG("restoring saved level, freq %d prio %d\n", 298 level->total_set.freq, priority); 299 } 300 301 /* Reject levels that are below our specified threshold. */ 302 if (level->total_set.freq < cf_lowest_freq) { 303 CF_DEBUG("rejecting freq %d, less than %d limit\n", 304 level->total_set.freq, cf_lowest_freq); 305 error = EINVAL; 306 goto out; 307 } 308 309 /* If already at this level, just return. */ 310 if (CPUFREQ_CMP(sc->curr_level.total_set.freq, level->total_set.freq)) { 311 CF_DEBUG("skipping freq %d, same as current level %d\n", 312 level->total_set.freq, sc->curr_level.total_set.freq); 313 goto skip; 314 } 315 316 /* First, set the absolute frequency via its driver. */ 317 set = &level->abs_set; 318 if (set->dev) { 319 if (!device_is_attached(set->dev)) { 320 error = ENXIO; 321 goto out; 322 } 323 324 /* Bind to the target CPU before switching. */ 325 pc = cpu_get_pcpu(set->dev); 326 thread_lock(curthread); 327 sched_bind(curthread, pc->pc_cpuid); 328 thread_unlock(curthread); 329 CF_DEBUG("setting abs 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 thread_lock(curthread); 333 sched_unbind(curthread); 334 thread_unlock(curthread); 335 if (error) { 336 goto out; 337 } 338 } 339 340 /* Next, set any/all relative frequencies via their drivers. */ 341 for (i = 0; i < level->rel_count; i++) { 342 set = &level->rel_set[i]; 343 if (!device_is_attached(set->dev)) { 344 error = ENXIO; 345 goto out; 346 } 347 348 /* Bind to the target CPU before switching. */ 349 pc = cpu_get_pcpu(set->dev); 350 thread_lock(curthread); 351 sched_bind(curthread, pc->pc_cpuid); 352 thread_unlock(curthread); 353 CF_DEBUG("setting rel freq %d on %s (cpu %d)\n", set->freq, 354 device_get_nameunit(set->dev), PCPU_GET(cpuid)); 355 error = CPUFREQ_DRV_SET(set->dev, set); 356 thread_lock(curthread); 357 sched_unbind(curthread); 358 thread_unlock(curthread); 359 if (error) { 360 /* XXX Back out any successful setting? */ 361 goto out; 362 } 363 } 364 365 skip: 366 /* 367 * Before recording the current level, check if we're going to a 368 * higher priority. If so, save the previous level and priority. 369 */ 370 if (sc->curr_level.total_set.freq != CPUFREQ_VAL_UNKNOWN && 371 priority > sc->curr_priority) { 372 CF_DEBUG("saving level, freq %d prio %d\n", 373 sc->curr_level.total_set.freq, sc->curr_priority); 374 curr_freq = malloc(sizeof(*curr_freq), M_TEMP, M_NOWAIT); 375 if (curr_freq == NULL) { 376 error = ENOMEM; 377 goto out; 378 } 379 curr_freq->level = sc->curr_level; 380 curr_freq->priority = sc->curr_priority; 381 SLIST_INSERT_HEAD(&sc->saved_freq, curr_freq, link); 382 } 383 sc->curr_level = *level; 384 sc->curr_priority = priority; 385 386 /* If we were restoring a saved state, reset it to "unused". */ 387 if (saved_freq != NULL) { 388 CF_DEBUG("resetting saved level\n"); 389 sc->curr_level.total_set.freq = CPUFREQ_VAL_UNKNOWN; 390 SLIST_REMOVE_HEAD(&sc->saved_freq, link); 391 free(saved_freq, M_TEMP); 392 } 393 394 out: 395 CF_MTX_UNLOCK(&sc->lock); 396 397 /* 398 * We changed levels (or attempted to) so notify the post-change 399 * handler of new frequency or error. 400 */ 401 EVENTHANDLER_INVOKE(cpufreq_post_change, level, error); 402 if (error && set) 403 device_printf(set->dev, "set freq failed, err %d\n", error); 404 405 return (error); 406 } 407 408 static int 409 cf_get_method(device_t dev, struct cf_level *level) 410 { 411 struct cpufreq_softc *sc; 412 struct cf_level *levels; 413 struct cf_setting *curr_set, set; 414 struct pcpu *pc; 415 device_t *devs; 416 int count, error, i, n, numdevs; 417 uint64_t rate; 418 419 sc = device_get_softc(dev); 420 error = 0; 421 levels = NULL; 422 423 /* If we already know the current frequency, we're done. */ 424 CF_MTX_LOCK(&sc->lock); 425 curr_set = &sc->curr_level.total_set; 426 if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) { 427 CF_DEBUG("get returning known freq %d\n", curr_set->freq); 428 goto out; 429 } 430 CF_MTX_UNLOCK(&sc->lock); 431 432 /* 433 * We need to figure out the current level. Loop through every 434 * driver, getting the current setting. Then, attempt to get a best 435 * match of settings against each level. 436 */ 437 count = CF_MAX_LEVELS; 438 levels = malloc(count * sizeof(*levels), M_TEMP, M_NOWAIT); 439 if (levels == NULL) 440 return (ENOMEM); 441 error = CPUFREQ_LEVELS(sc->dev, levels, &count); 442 if (error) { 443 if (error == E2BIG) 444 printf("cpufreq: need to increase CF_MAX_LEVELS\n"); 445 free(levels, M_TEMP); 446 return (error); 447 } 448 error = device_get_children(device_get_parent(dev), &devs, &numdevs); 449 if (error) { 450 free(levels, M_TEMP); 451 return (error); 452 } 453 454 /* 455 * Reacquire the lock and search for the given level. 456 * 457 * XXX Note: this is not quite right since we really need to go 458 * through each level and compare both absolute and relative 459 * settings for each driver in the system before making a match. 460 * The estimation code below catches this case though. 461 */ 462 CF_MTX_LOCK(&sc->lock); 463 for (n = 0; n < numdevs && curr_set->freq == CPUFREQ_VAL_UNKNOWN; n++) { 464 if (!device_is_attached(devs[n])) 465 continue; 466 if (CPUFREQ_DRV_GET(devs[n], &set) != 0) 467 continue; 468 for (i = 0; i < count; i++) { 469 if (CPUFREQ_CMP(set.freq, levels[i].total_set.freq)) { 470 sc->curr_level = levels[i]; 471 break; 472 } 473 } 474 } 475 free(devs, M_TEMP); 476 if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) { 477 CF_DEBUG("get matched freq %d from drivers\n", curr_set->freq); 478 goto out; 479 } 480 481 /* 482 * We couldn't find an exact match, so attempt to estimate and then 483 * match against a level. 484 */ 485 pc = cpu_get_pcpu(dev); 486 if (pc == NULL) { 487 error = ENXIO; 488 goto out; 489 } 490 cpu_est_clockrate(pc->pc_cpuid, &rate); 491 rate /= 1000000; 492 for (i = 0; i < count; i++) { 493 if (CPUFREQ_CMP(rate, levels[i].total_set.freq)) { 494 sc->curr_level = levels[i]; 495 CF_DEBUG("get estimated freq %d\n", curr_set->freq); 496 goto out; 497 } 498 } 499 error = ENXIO; 500 501 out: 502 if (error == 0) 503 *level = sc->curr_level; 504 505 CF_MTX_UNLOCK(&sc->lock); 506 if (levels) 507 free(levels, M_TEMP); 508 return (error); 509 } 510 511 static int 512 cf_levels_method(device_t dev, struct cf_level *levels, int *count) 513 { 514 struct cf_setting_array *set_arr; 515 struct cf_setting_lst rel_sets; 516 struct cpufreq_softc *sc; 517 struct cf_level *lev; 518 struct cf_setting *sets; 519 struct pcpu *pc; 520 device_t *devs; 521 int error, i, numdevs, set_count, type; 522 uint64_t rate; 523 524 if (levels == NULL || count == NULL) 525 return (EINVAL); 526 527 TAILQ_INIT(&rel_sets); 528 sc = device_get_softc(dev); 529 error = device_get_children(device_get_parent(dev), &devs, &numdevs); 530 if (error) 531 return (error); 532 sets = malloc(MAX_SETTINGS * sizeof(*sets), M_TEMP, M_NOWAIT); 533 if (sets == NULL) { 534 free(devs, M_TEMP); 535 return (ENOMEM); 536 } 537 538 /* Get settings from all cpufreq drivers. */ 539 CF_MTX_LOCK(&sc->lock); 540 for (i = 0; i < numdevs; i++) { 541 /* Skip devices that aren't ready. */ 542 if (!device_is_attached(devs[i])) 543 continue; 544 545 /* 546 * Get settings, skipping drivers that offer no settings or 547 * provide settings for informational purposes only. 548 */ 549 error = CPUFREQ_DRV_TYPE(devs[i], &type); 550 if (error || (type & CPUFREQ_FLAG_INFO_ONLY)) { 551 if (error == 0) { 552 CF_DEBUG("skipping info-only driver %s\n", 553 device_get_nameunit(devs[i])); 554 } 555 continue; 556 } 557 set_count = MAX_SETTINGS; 558 error = CPUFREQ_DRV_SETTINGS(devs[i], sets, &set_count); 559 if (error || set_count == 0) 560 continue; 561 562 /* Add the settings to our absolute/relative lists. */ 563 switch (type & CPUFREQ_TYPE_MASK) { 564 case CPUFREQ_TYPE_ABSOLUTE: 565 error = cpufreq_insert_abs(sc, sets, set_count); 566 break; 567 case CPUFREQ_TYPE_RELATIVE: 568 CF_DEBUG("adding %d relative settings\n", set_count); 569 set_arr = malloc(sizeof(*set_arr), M_TEMP, M_NOWAIT); 570 if (set_arr == NULL) { 571 error = ENOMEM; 572 goto out; 573 } 574 bcopy(sets, set_arr->sets, set_count * sizeof(*sets)); 575 set_arr->count = set_count; 576 TAILQ_INSERT_TAIL(&rel_sets, set_arr, link); 577 break; 578 default: 579 error = EINVAL; 580 } 581 if (error) 582 goto out; 583 } 584 585 /* 586 * If there are no absolute levels, create a fake one at 100%. We 587 * then cache the clockrate for later use as our base frequency. 588 */ 589 if (TAILQ_EMPTY(&sc->all_levels)) { 590 if (sc->max_mhz == CPUFREQ_VAL_UNKNOWN) { 591 sc->max_mhz = cpu_get_nominal_mhz(dev); 592 /* 593 * If the CPU can't report a rate for 100%, hope 594 * the CPU is running at its nominal rate right now, 595 * and use that instead. 596 */ 597 if (sc->max_mhz <= 0) { 598 pc = cpu_get_pcpu(dev); 599 cpu_est_clockrate(pc->pc_cpuid, &rate); 600 sc->max_mhz = rate / 1000000; 601 } 602 } 603 memset(&sets[0], CPUFREQ_VAL_UNKNOWN, sizeof(*sets)); 604 sets[0].freq = sc->max_mhz; 605 sets[0].dev = NULL; 606 error = cpufreq_insert_abs(sc, sets, 1); 607 if (error) 608 goto out; 609 } 610 611 /* Create a combined list of absolute + relative levels. */ 612 TAILQ_FOREACH(set_arr, &rel_sets, link) 613 cpufreq_expand_set(sc, set_arr); 614 615 /* If the caller doesn't have enough space, return the actual count. */ 616 if (sc->all_count > *count) { 617 *count = sc->all_count; 618 error = E2BIG; 619 goto out; 620 } 621 622 /* Finally, output the list of levels. */ 623 i = 0; 624 TAILQ_FOREACH(lev, &sc->all_levels, link) { 625 /* 626 * Skip levels that are too close in frequency to the 627 * previous levels. Some systems report bogus duplicate 628 * settings (i.e., for acpi_perf). 629 */ 630 if (i > 0 && CPUFREQ_CMP(lev->total_set.freq, 631 levels[i - 1].total_set.freq)) { 632 sc->all_count--; 633 continue; 634 } 635 636 /* Skip levels that have a frequency that is too low. */ 637 if (lev->total_set.freq < cf_lowest_freq) { 638 sc->all_count--; 639 continue; 640 } 641 642 levels[i] = *lev; 643 i++; 644 } 645 *count = sc->all_count; 646 error = 0; 647 648 out: 649 /* Clear all levels since we regenerate them each time. */ 650 while ((lev = TAILQ_FIRST(&sc->all_levels)) != NULL) { 651 TAILQ_REMOVE(&sc->all_levels, lev, link); 652 free(lev, M_TEMP); 653 } 654 sc->all_count = 0; 655 656 CF_MTX_UNLOCK(&sc->lock); 657 while ((set_arr = TAILQ_FIRST(&rel_sets)) != NULL) { 658 TAILQ_REMOVE(&rel_sets, set_arr, link); 659 free(set_arr, M_TEMP); 660 } 661 free(devs, M_TEMP); 662 free(sets, M_TEMP); 663 return (error); 664 } 665 666 /* 667 * Create levels for an array of absolute settings and insert them in 668 * sorted order in the specified list. 669 */ 670 static int 671 cpufreq_insert_abs(struct cpufreq_softc *sc, struct cf_setting *sets, 672 int count) 673 { 674 struct cf_level_lst *list; 675 struct cf_level *level, *search; 676 int i; 677 678 CF_MTX_ASSERT(&sc->lock); 679 680 list = &sc->all_levels; 681 for (i = 0; i < count; i++) { 682 level = malloc(sizeof(*level), M_TEMP, M_NOWAIT | M_ZERO); 683 if (level == NULL) 684 return (ENOMEM); 685 level->abs_set = sets[i]; 686 level->total_set = sets[i]; 687 level->total_set.dev = NULL; 688 sc->all_count++; 689 690 if (TAILQ_EMPTY(list)) { 691 CF_DEBUG("adding abs setting %d at head\n", 692 sets[i].freq); 693 TAILQ_INSERT_HEAD(list, level, link); 694 continue; 695 } 696 697 TAILQ_FOREACH_REVERSE(search, list, cf_level_lst, link) { 698 if (sets[i].freq <= search->total_set.freq) { 699 CF_DEBUG("adding abs setting %d after %d\n", 700 sets[i].freq, search->total_set.freq); 701 TAILQ_INSERT_AFTER(list, search, level, link); 702 break; 703 } 704 } 705 } 706 return (0); 707 } 708 709 /* 710 * Expand a group of relative settings, creating derived levels from them. 711 */ 712 static int 713 cpufreq_expand_set(struct cpufreq_softc *sc, struct cf_setting_array *set_arr) 714 { 715 struct cf_level *fill, *search; 716 struct cf_setting *set; 717 int i; 718 719 CF_MTX_ASSERT(&sc->lock); 720 721 /* 722 * Walk the set of all existing levels in reverse. This is so we 723 * create derived states from the lowest absolute settings first 724 * and discard duplicates created from higher absolute settings. 725 * For instance, a level of 50 Mhz derived from 100 Mhz + 50% is 726 * preferable to 200 Mhz + 25% because absolute settings are more 727 * efficient since they often change the voltage as well. 728 */ 729 TAILQ_FOREACH_REVERSE(search, &sc->all_levels, cf_level_lst, link) { 730 /* Add each setting to the level, duplicating if necessary. */ 731 for (i = 0; i < set_arr->count; i++) { 732 set = &set_arr->sets[i]; 733 734 /* 735 * If this setting is less than 100%, split the level 736 * into two and add this setting to the new level. 737 */ 738 fill = search; 739 if (set->freq < 10000) { 740 fill = cpufreq_dup_set(sc, search, set); 741 742 /* 743 * The new level was a duplicate of an existing 744 * level or its absolute setting is too high 745 * so we freed it. For example, we discard a 746 * derived level of 1000 MHz/25% if a level 747 * of 500 MHz/100% already exists. 748 */ 749 if (fill == NULL) 750 break; 751 } 752 753 /* Add this setting to the existing or new level. */ 754 KASSERT(fill->rel_count < MAX_SETTINGS, 755 ("cpufreq: too many relative drivers (%d)", 756 MAX_SETTINGS)); 757 fill->rel_set[fill->rel_count] = *set; 758 fill->rel_count++; 759 CF_DEBUG( 760 "expand set added rel setting %d%% to %d level\n", 761 set->freq / 100, fill->total_set.freq); 762 } 763 } 764 765 return (0); 766 } 767 768 static struct cf_level * 769 cpufreq_dup_set(struct cpufreq_softc *sc, struct cf_level *dup, 770 struct cf_setting *set) 771 { 772 struct cf_level_lst *list; 773 struct cf_level *fill, *itr; 774 struct cf_setting *fill_set, *itr_set; 775 int i; 776 777 CF_MTX_ASSERT(&sc->lock); 778 779 /* 780 * Create a new level, copy it from the old one, and update the 781 * total frequency and power by the percentage specified in the 782 * relative setting. 783 */ 784 fill = malloc(sizeof(*fill), M_TEMP, M_NOWAIT); 785 if (fill == NULL) 786 return (NULL); 787 *fill = *dup; 788 fill_set = &fill->total_set; 789 fill_set->freq = 790 ((uint64_t)fill_set->freq * set->freq) / 10000; 791 if (fill_set->power != CPUFREQ_VAL_UNKNOWN) { 792 fill_set->power = ((uint64_t)fill_set->power * set->freq) 793 / 10000; 794 } 795 if (set->lat != CPUFREQ_VAL_UNKNOWN) { 796 if (fill_set->lat != CPUFREQ_VAL_UNKNOWN) 797 fill_set->lat += set->lat; 798 else 799 fill_set->lat = set->lat; 800 } 801 CF_DEBUG("dup set considering derived setting %d\n", fill_set->freq); 802 803 /* 804 * If we copied an old level that we already modified (say, at 100%), 805 * we need to remove that setting before adding this one. Since we 806 * process each setting array in order, we know any settings for this 807 * driver will be found at the end. 808 */ 809 for (i = fill->rel_count; i != 0; i--) { 810 if (fill->rel_set[i - 1].dev != set->dev) 811 break; 812 CF_DEBUG("removed last relative driver: %s\n", 813 device_get_nameunit(set->dev)); 814 fill->rel_count--; 815 } 816 817 /* 818 * Insert the new level in sorted order. If it is a duplicate of an 819 * existing level (1) or has an absolute setting higher than the 820 * existing level (2), do not add it. We can do this since any such 821 * level is guaranteed use less power. For example (1), a level with 822 * one absolute setting of 800 Mhz uses less power than one composed 823 * of an absolute setting of 1600 Mhz and a relative setting at 50%. 824 * Also for example (2), a level of 800 Mhz/75% is preferable to 825 * 1600 Mhz/25% even though the latter has a lower total frequency. 826 */ 827 list = &sc->all_levels; 828 KASSERT(!TAILQ_EMPTY(list), ("all levels list empty in dup set")); 829 TAILQ_FOREACH_REVERSE(itr, list, cf_level_lst, link) { 830 itr_set = &itr->total_set; 831 if (CPUFREQ_CMP(fill_set->freq, itr_set->freq)) { 832 CF_DEBUG("dup set rejecting %d (dupe)\n", 833 fill_set->freq); 834 itr = NULL; 835 break; 836 } else if (fill_set->freq < itr_set->freq) { 837 if (fill->abs_set.freq <= itr->abs_set.freq) { 838 CF_DEBUG( 839 "dup done, inserting new level %d after %d\n", 840 fill_set->freq, itr_set->freq); 841 TAILQ_INSERT_AFTER(list, itr, fill, link); 842 sc->all_count++; 843 } else { 844 CF_DEBUG("dup set rejecting %d (abs too big)\n", 845 fill_set->freq); 846 itr = NULL; 847 } 848 break; 849 } 850 } 851 852 /* We didn't find a good place for this new level so free it. */ 853 if (itr == NULL) { 854 CF_DEBUG("dup set freeing new level %d (not optimal)\n", 855 fill_set->freq); 856 free(fill, M_TEMP); 857 fill = NULL; 858 } 859 860 return (fill); 861 } 862 863 static int 864 cpufreq_curr_sysctl(SYSCTL_HANDLER_ARGS) 865 { 866 struct cpufreq_softc *sc; 867 struct cf_level *levels; 868 int count, devcount, error, freq, i, n; 869 device_t *devs; 870 871 devs = NULL; 872 sc = oidp->oid_arg1; 873 levels = malloc(CF_MAX_LEVELS * sizeof(*levels), M_TEMP, M_NOWAIT); 874 if (levels == NULL) 875 return (ENOMEM); 876 877 error = CPUFREQ_GET(sc->dev, &levels[0]); 878 if (error) 879 goto out; 880 freq = levels[0].total_set.freq; 881 error = sysctl_handle_int(oidp, &freq, 0, req); 882 if (error != 0 || req->newptr == NULL) 883 goto out; 884 885 /* 886 * While we only call cpufreq_get() on one device (assuming all 887 * CPUs have equal levels), we call cpufreq_set() on all CPUs. 888 * This is needed for some MP systems. 889 */ 890 error = devclass_get_devices(cpufreq_dc, &devs, &devcount); 891 if (error) 892 goto out; 893 for (n = 0; n < devcount; n++) { 894 count = CF_MAX_LEVELS; 895 error = CPUFREQ_LEVELS(devs[n], levels, &count); 896 if (error) { 897 if (error == E2BIG) 898 printf( 899 "cpufreq: need to increase CF_MAX_LEVELS\n"); 900 break; 901 } 902 for (i = 0; i < count; i++) { 903 if (CPUFREQ_CMP(levels[i].total_set.freq, freq)) { 904 error = CPUFREQ_SET(devs[n], &levels[i], 905 CPUFREQ_PRIO_USER); 906 break; 907 } 908 } 909 if (i == count) { 910 error = EINVAL; 911 break; 912 } 913 } 914 915 out: 916 if (devs) 917 free(devs, M_TEMP); 918 if (levels) 919 free(levels, M_TEMP); 920 return (error); 921 } 922 923 static int 924 cpufreq_levels_sysctl(SYSCTL_HANDLER_ARGS) 925 { 926 struct cpufreq_softc *sc; 927 struct cf_level *levels; 928 struct cf_setting *set; 929 struct sbuf sb; 930 int count, error, i; 931 932 sc = oidp->oid_arg1; 933 sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND); 934 935 /* Get settings from the device and generate the output string. */ 936 count = CF_MAX_LEVELS; 937 levels = malloc(count * sizeof(*levels), M_TEMP, M_NOWAIT); 938 if (levels == NULL) { 939 sbuf_delete(&sb); 940 return (ENOMEM); 941 } 942 error = CPUFREQ_LEVELS(sc->dev, levels, &count); 943 if (error) { 944 if (error == E2BIG) 945 printf("cpufreq: need to increase CF_MAX_LEVELS\n"); 946 goto out; 947 } 948 if (count) { 949 for (i = 0; i < count; i++) { 950 set = &levels[i].total_set; 951 sbuf_printf(&sb, "%d/%d ", set->freq, set->power); 952 } 953 } else 954 sbuf_cpy(&sb, "0"); 955 sbuf_trim(&sb); 956 sbuf_finish(&sb); 957 error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req); 958 959 out: 960 free(levels, M_TEMP); 961 sbuf_delete(&sb); 962 return (error); 963 } 964 965 static int 966 cpufreq_settings_sysctl(SYSCTL_HANDLER_ARGS) 967 { 968 device_t dev; 969 struct cf_setting *sets; 970 struct sbuf sb; 971 int error, i, set_count; 972 973 dev = oidp->oid_arg1; 974 sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND); 975 976 /* Get settings from the device and generate the output string. */ 977 set_count = MAX_SETTINGS; 978 sets = malloc(set_count * sizeof(*sets), M_TEMP, M_NOWAIT); 979 if (sets == NULL) { 980 sbuf_delete(&sb); 981 return (ENOMEM); 982 } 983 error = CPUFREQ_DRV_SETTINGS(dev, sets, &set_count); 984 if (error) 985 goto out; 986 if (set_count) { 987 for (i = 0; i < set_count; i++) 988 sbuf_printf(&sb, "%d/%d ", sets[i].freq, sets[i].power); 989 } else 990 sbuf_cpy(&sb, "0"); 991 sbuf_trim(&sb); 992 sbuf_finish(&sb); 993 error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req); 994 995 out: 996 free(sets, M_TEMP); 997 sbuf_delete(&sb); 998 return (error); 999 } 1000 1001 int 1002 cpufreq_register(device_t dev) 1003 { 1004 struct cpufreq_softc *sc; 1005 device_t cf_dev, cpu_dev; 1006 1007 /* Add a sysctl to get each driver's settings separately. */ 1008 SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev), 1009 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), 1010 OID_AUTO, "freq_settings", CTLTYPE_STRING | CTLFLAG_RD, dev, 0, 1011 cpufreq_settings_sysctl, "A", "CPU frequency driver settings"); 1012 1013 /* 1014 * Add only one cpufreq device to each CPU. Currently, all CPUs 1015 * must offer the same levels and be switched at the same time. 1016 */ 1017 cpu_dev = device_get_parent(dev); 1018 if ((cf_dev = device_find_child(cpu_dev, "cpufreq", -1))) { 1019 sc = device_get_softc(cf_dev); 1020 sc->max_mhz = CPUFREQ_VAL_UNKNOWN; 1021 return (0); 1022 } 1023 1024 /* Add the child device and possibly sysctls. */ 1025 cf_dev = BUS_ADD_CHILD(cpu_dev, 0, "cpufreq", -1); 1026 if (cf_dev == NULL) 1027 return (ENOMEM); 1028 device_quiet(cf_dev); 1029 1030 return (device_probe_and_attach(cf_dev)); 1031 } 1032 1033 int 1034 cpufreq_unregister(device_t dev) 1035 { 1036 device_t cf_dev, *devs; 1037 int cfcount, devcount, error, i, type; 1038 1039 /* 1040 * If this is the last cpufreq child device, remove the control 1041 * device as well. We identify cpufreq children by calling a method 1042 * they support. 1043 */ 1044 error = device_get_children(device_get_parent(dev), &devs, &devcount); 1045 if (error) 1046 return (error); 1047 cf_dev = device_find_child(device_get_parent(dev), "cpufreq", -1); 1048 if (cf_dev == NULL) { 1049 device_printf(dev, 1050 "warning: cpufreq_unregister called with no cpufreq device active\n"); 1051 return (0); 1052 } 1053 cfcount = 0; 1054 for (i = 0; i < devcount; i++) { 1055 if (!device_is_attached(devs[i])) 1056 continue; 1057 if (CPUFREQ_DRV_TYPE(devs[i], &type) == 0) 1058 cfcount++; 1059 } 1060 if (cfcount <= 1) 1061 device_delete_child(device_get_parent(cf_dev), cf_dev); 1062 free(devs, M_TEMP); 1063 1064 return (0); 1065 } 1066 1067 int 1068 cpufreq_settings_changed(device_t dev) 1069 { 1070 1071 EVENTHANDLER_INVOKE(cpufreq_levels_changed, 1072 device_get_unit(device_get_parent(dev))); 1073 return (0); 1074 } 1075