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 struct cf_level *levels_buf; 80 }; 81 82 struct cf_setting_array { 83 struct cf_setting sets[MAX_SETTINGS]; 84 int count; 85 TAILQ_ENTRY(cf_setting_array) link; 86 }; 87 88 TAILQ_HEAD(cf_setting_lst, cf_setting_array); 89 90 #define CF_MTX_INIT(x) sx_init((x), "cpufreq lock") 91 #define CF_MTX_LOCK(x) sx_xlock((x)) 92 #define CF_MTX_UNLOCK(x) sx_xunlock((x)) 93 #define CF_MTX_ASSERT(x) sx_assert((x), SX_XLOCKED) 94 95 #define CF_DEBUG(msg...) do { \ 96 if (cf_verbose) \ 97 printf("cpufreq: " msg); \ 98 } while (0) 99 100 static int cpufreq_attach(device_t dev); 101 static void cpufreq_startup_task(void *ctx, int pending); 102 static int cpufreq_detach(device_t dev); 103 static int cf_set_method(device_t dev, const struct cf_level *level, 104 int priority); 105 static int cf_get_method(device_t dev, struct cf_level *level); 106 static int cf_levels_method(device_t dev, struct cf_level *levels, 107 int *count); 108 static int cpufreq_insert_abs(struct cpufreq_softc *sc, 109 struct cf_setting *sets, int count); 110 static int cpufreq_expand_set(struct cpufreq_softc *sc, 111 struct cf_setting_array *set_arr); 112 static struct cf_level *cpufreq_dup_set(struct cpufreq_softc *sc, 113 struct cf_level *dup, struct cf_setting *set); 114 static int cpufreq_curr_sysctl(SYSCTL_HANDLER_ARGS); 115 static int cpufreq_levels_sysctl(SYSCTL_HANDLER_ARGS); 116 static int cpufreq_settings_sysctl(SYSCTL_HANDLER_ARGS); 117 118 static device_method_t cpufreq_methods[] = { 119 DEVMETHOD(device_probe, bus_generic_probe), 120 DEVMETHOD(device_attach, cpufreq_attach), 121 DEVMETHOD(device_detach, cpufreq_detach), 122 123 DEVMETHOD(cpufreq_set, cf_set_method), 124 DEVMETHOD(cpufreq_get, cf_get_method), 125 DEVMETHOD(cpufreq_levels, cf_levels_method), 126 {0, 0} 127 }; 128 static driver_t cpufreq_driver = { 129 "cpufreq", cpufreq_methods, sizeof(struct cpufreq_softc) 130 }; 131 static devclass_t cpufreq_dc; 132 DRIVER_MODULE(cpufreq, cpu, cpufreq_driver, cpufreq_dc, 0, 0); 133 134 static int cf_lowest_freq; 135 static int cf_verbose; 136 static SYSCTL_NODE(_debug, OID_AUTO, cpufreq, CTLFLAG_RD, NULL, 137 "cpufreq debugging"); 138 SYSCTL_INT(_debug_cpufreq, OID_AUTO, lowest, CTLFLAG_RWTUN, &cf_lowest_freq, 1, 139 "Don't provide levels below this frequency."); 140 SYSCTL_INT(_debug_cpufreq, OID_AUTO, verbose, CTLFLAG_RWTUN, &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 sc->levels_buf = malloc(CF_MAX_LEVELS * sizeof(*sc->levels_buf), 184 M_DEVBUF, M_WAITOK); 185 SYSCTL_ADD_PROC(&sc->sysctl_ctx, 186 SYSCTL_CHILDREN(device_get_sysctl_tree(parent)), 187 OID_AUTO, "freq", CTLTYPE_INT | CTLFLAG_RW, sc, 0, 188 cpufreq_curr_sysctl, "I", "Current CPU frequency"); 189 SYSCTL_ADD_PROC(&sc->sysctl_ctx, 190 SYSCTL_CHILDREN(device_get_sysctl_tree(parent)), 191 OID_AUTO, "freq_levels", CTLTYPE_STRING | CTLFLAG_RD, sc, 0, 192 cpufreq_levels_sysctl, "A", "CPU frequency levels"); 193 194 /* 195 * Queue a one-shot broadcast that levels have changed. 196 * It will run once the system has completed booting. 197 */ 198 TASK_INIT(&sc->startup_task, 0, cpufreq_startup_task, dev); 199 taskqueue_enqueue(taskqueue_thread, &sc->startup_task); 200 201 return (0); 202 } 203 204 /* Handle any work to be done for all drivers that attached during boot. */ 205 static void 206 cpufreq_startup_task(void *ctx, int pending) 207 { 208 209 cpufreq_settings_changed((device_t)ctx); 210 } 211 212 static int 213 cpufreq_detach(device_t dev) 214 { 215 struct cpufreq_softc *sc; 216 struct cf_saved_freq *saved_freq; 217 int numdevs; 218 219 CF_DEBUG("shutdown %s\n", device_get_nameunit(dev)); 220 sc = device_get_softc(dev); 221 sysctl_ctx_free(&sc->sysctl_ctx); 222 223 while ((saved_freq = SLIST_FIRST(&sc->saved_freq)) != NULL) { 224 SLIST_REMOVE_HEAD(&sc->saved_freq, link); 225 free(saved_freq, M_TEMP); 226 } 227 228 /* Only clean up these resources when the last device is detaching. */ 229 numdevs = devclass_get_count(cpufreq_dc); 230 if (numdevs == 1) { 231 CF_DEBUG("final shutdown for %s\n", device_get_nameunit(dev)); 232 free(sc->levels_buf, M_DEVBUF); 233 } 234 235 return (0); 236 } 237 238 static int 239 cf_set_method(device_t dev, const struct cf_level *level, int priority) 240 { 241 struct cpufreq_softc *sc; 242 const struct cf_setting *set; 243 struct cf_saved_freq *saved_freq, *curr_freq; 244 struct pcpu *pc; 245 int error, i; 246 247 sc = device_get_softc(dev); 248 error = 0; 249 set = NULL; 250 saved_freq = NULL; 251 252 /* We are going to change levels so notify the pre-change handler. */ 253 EVENTHANDLER_INVOKE(cpufreq_pre_change, level, &error); 254 if (error != 0) { 255 EVENTHANDLER_INVOKE(cpufreq_post_change, level, error); 256 return (error); 257 } 258 259 CF_MTX_LOCK(&sc->lock); 260 261 #ifdef SMP 262 /* 263 * If still booting and secondary CPUs not started yet, don't allow 264 * changing the frequency until they're online. This is because we 265 * can't switch to them using sched_bind() and thus we'd only be 266 * switching the main CPU. XXXTODO: Need to think more about how to 267 * handle having different CPUs at different frequencies. 268 */ 269 if (mp_ncpus > 1 && !smp_started) { 270 device_printf(dev, "rejecting change, SMP not started yet\n"); 271 error = ENXIO; 272 goto out; 273 } 274 #endif /* SMP */ 275 276 /* 277 * If the requested level has a lower priority, don't allow 278 * the new level right now. 279 */ 280 if (priority < sc->curr_priority) { 281 CF_DEBUG("ignoring, curr prio %d less than %d\n", priority, 282 sc->curr_priority); 283 error = EPERM; 284 goto out; 285 } 286 287 /* 288 * If the caller didn't specify a level and one is saved, prepare to 289 * restore the saved level. If none has been saved, return an error. 290 */ 291 if (level == NULL) { 292 saved_freq = SLIST_FIRST(&sc->saved_freq); 293 if (saved_freq == NULL) { 294 CF_DEBUG("NULL level, no saved level\n"); 295 error = ENXIO; 296 goto out; 297 } 298 level = &saved_freq->level; 299 priority = saved_freq->priority; 300 CF_DEBUG("restoring saved level, freq %d prio %d\n", 301 level->total_set.freq, priority); 302 } 303 304 /* Reject levels that are below our specified threshold. */ 305 if (level->total_set.freq < cf_lowest_freq) { 306 CF_DEBUG("rejecting freq %d, less than %d limit\n", 307 level->total_set.freq, cf_lowest_freq); 308 error = EINVAL; 309 goto out; 310 } 311 312 /* If already at this level, just return. */ 313 if (sc->curr_level.total_set.freq == level->total_set.freq) { 314 CF_DEBUG("skipping freq %d, same as current level %d\n", 315 level->total_set.freq, sc->curr_level.total_set.freq); 316 goto skip; 317 } 318 319 /* First, set the absolute frequency via its driver. */ 320 set = &level->abs_set; 321 if (set->dev) { 322 if (!device_is_attached(set->dev)) { 323 error = ENXIO; 324 goto out; 325 } 326 327 /* Bind to the target CPU before switching. */ 328 pc = cpu_get_pcpu(set->dev); 329 thread_lock(curthread); 330 sched_bind(curthread, pc->pc_cpuid); 331 thread_unlock(curthread); 332 CF_DEBUG("setting abs freq %d on %s (cpu %d)\n", set->freq, 333 device_get_nameunit(set->dev), PCPU_GET(cpuid)); 334 error = CPUFREQ_DRV_SET(set->dev, set); 335 thread_lock(curthread); 336 sched_unbind(curthread); 337 thread_unlock(curthread); 338 if (error) { 339 goto out; 340 } 341 } 342 343 /* Next, set any/all relative frequencies via their drivers. */ 344 for (i = 0; i < level->rel_count; i++) { 345 set = &level->rel_set[i]; 346 if (!device_is_attached(set->dev)) { 347 error = ENXIO; 348 goto out; 349 } 350 351 /* Bind to the target CPU before switching. */ 352 pc = cpu_get_pcpu(set->dev); 353 thread_lock(curthread); 354 sched_bind(curthread, pc->pc_cpuid); 355 thread_unlock(curthread); 356 CF_DEBUG("setting rel freq %d on %s (cpu %d)\n", set->freq, 357 device_get_nameunit(set->dev), PCPU_GET(cpuid)); 358 error = CPUFREQ_DRV_SET(set->dev, set); 359 thread_lock(curthread); 360 sched_unbind(curthread); 361 thread_unlock(curthread); 362 if (error) { 363 /* XXX Back out any successful setting? */ 364 goto out; 365 } 366 } 367 368 skip: 369 /* 370 * Before recording the current level, check if we're going to a 371 * higher priority. If so, save the previous level and priority. 372 */ 373 if (sc->curr_level.total_set.freq != CPUFREQ_VAL_UNKNOWN && 374 priority > sc->curr_priority) { 375 CF_DEBUG("saving level, freq %d prio %d\n", 376 sc->curr_level.total_set.freq, sc->curr_priority); 377 curr_freq = malloc(sizeof(*curr_freq), M_TEMP, M_NOWAIT); 378 if (curr_freq == NULL) { 379 error = ENOMEM; 380 goto out; 381 } 382 curr_freq->level = sc->curr_level; 383 curr_freq->priority = sc->curr_priority; 384 SLIST_INSERT_HEAD(&sc->saved_freq, curr_freq, link); 385 } 386 sc->curr_level = *level; 387 sc->curr_priority = priority; 388 389 /* If we were restoring a saved state, reset it to "unused". */ 390 if (saved_freq != NULL) { 391 CF_DEBUG("resetting saved level\n"); 392 sc->curr_level.total_set.freq = CPUFREQ_VAL_UNKNOWN; 393 SLIST_REMOVE_HEAD(&sc->saved_freq, link); 394 free(saved_freq, M_TEMP); 395 } 396 397 out: 398 CF_MTX_UNLOCK(&sc->lock); 399 400 /* 401 * We changed levels (or attempted to) so notify the post-change 402 * handler of new frequency or error. 403 */ 404 EVENTHANDLER_INVOKE(cpufreq_post_change, level, error); 405 if (error && set) 406 device_printf(set->dev, "set freq failed, err %d\n", error); 407 408 return (error); 409 } 410 411 static int 412 cf_get_method(device_t dev, struct cf_level *level) 413 { 414 struct cpufreq_softc *sc; 415 struct cf_level *levels; 416 struct cf_setting *curr_set, set; 417 struct pcpu *pc; 418 device_t *devs; 419 int bdiff, count, diff, error, i, n, numdevs; 420 uint64_t rate; 421 422 sc = device_get_softc(dev); 423 error = 0; 424 levels = NULL; 425 426 /* If we already know the current frequency, we're done. */ 427 CF_MTX_LOCK(&sc->lock); 428 curr_set = &sc->curr_level.total_set; 429 if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) { 430 CF_DEBUG("get returning known freq %d\n", curr_set->freq); 431 goto out; 432 } 433 CF_MTX_UNLOCK(&sc->lock); 434 435 /* 436 * We need to figure out the current level. Loop through every 437 * driver, getting the current setting. Then, attempt to get a best 438 * match of settings against each level. 439 */ 440 count = CF_MAX_LEVELS; 441 levels = malloc(count * sizeof(*levels), M_TEMP, M_NOWAIT); 442 if (levels == NULL) 443 return (ENOMEM); 444 error = CPUFREQ_LEVELS(sc->dev, levels, &count); 445 if (error) { 446 if (error == E2BIG) 447 printf("cpufreq: need to increase CF_MAX_LEVELS\n"); 448 free(levels, M_TEMP); 449 return (error); 450 } 451 error = device_get_children(device_get_parent(dev), &devs, &numdevs); 452 if (error) { 453 free(levels, M_TEMP); 454 return (error); 455 } 456 457 /* 458 * Reacquire the lock and search for the given level. 459 * 460 * XXX Note: this is not quite right since we really need to go 461 * through each level and compare both absolute and relative 462 * settings for each driver in the system before making a match. 463 * The estimation code below catches this case though. 464 */ 465 CF_MTX_LOCK(&sc->lock); 466 for (n = 0; n < numdevs && curr_set->freq == CPUFREQ_VAL_UNKNOWN; n++) { 467 if (!device_is_attached(devs[n])) 468 continue; 469 if (CPUFREQ_DRV_GET(devs[n], &set) != 0) 470 continue; 471 for (i = 0; i < count; i++) { 472 if (set.freq == levels[i].total_set.freq) { 473 sc->curr_level = levels[i]; 474 break; 475 } 476 } 477 } 478 free(devs, M_TEMP); 479 if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) { 480 CF_DEBUG("get matched freq %d from drivers\n", curr_set->freq); 481 goto out; 482 } 483 484 /* 485 * We couldn't find an exact match, so attempt to estimate and then 486 * match against a level. 487 */ 488 pc = cpu_get_pcpu(dev); 489 if (pc == NULL) { 490 error = ENXIO; 491 goto out; 492 } 493 cpu_est_clockrate(pc->pc_cpuid, &rate); 494 rate /= 1000000; 495 bdiff = 1 << 30; 496 for (i = 0; i < count; i++) { 497 diff = abs(levels[i].total_set.freq - rate); 498 if (diff < bdiff) { 499 bdiff = diff; 500 sc->curr_level = levels[i]; 501 } 502 } 503 CF_DEBUG("get estimated freq %d\n", curr_set->freq); 504 505 out: 506 if (error == 0) 507 *level = sc->curr_level; 508 509 CF_MTX_UNLOCK(&sc->lock); 510 if (levels) 511 free(levels, M_TEMP); 512 return (error); 513 } 514 515 static int 516 cf_levels_method(device_t dev, struct cf_level *levels, int *count) 517 { 518 struct cf_setting_array *set_arr; 519 struct cf_setting_lst rel_sets; 520 struct cpufreq_softc *sc; 521 struct cf_level *lev; 522 struct cf_setting *sets; 523 struct pcpu *pc; 524 device_t *devs; 525 int error, i, numdevs, set_count, type; 526 uint64_t rate; 527 528 if (levels == NULL || count == NULL) 529 return (EINVAL); 530 531 TAILQ_INIT(&rel_sets); 532 sc = device_get_softc(dev); 533 error = device_get_children(device_get_parent(dev), &devs, &numdevs); 534 if (error) 535 return (error); 536 sets = malloc(MAX_SETTINGS * sizeof(*sets), M_TEMP, M_NOWAIT); 537 if (sets == NULL) { 538 free(devs, M_TEMP); 539 return (ENOMEM); 540 } 541 542 /* Get settings from all cpufreq drivers. */ 543 CF_MTX_LOCK(&sc->lock); 544 for (i = 0; i < numdevs; i++) { 545 /* Skip devices that aren't ready. */ 546 if (!device_is_attached(devs[i])) 547 continue; 548 549 /* 550 * Get settings, skipping drivers that offer no settings or 551 * provide settings for informational purposes only. 552 */ 553 error = CPUFREQ_DRV_TYPE(devs[i], &type); 554 if (error || (type & CPUFREQ_FLAG_INFO_ONLY)) { 555 if (error == 0) { 556 CF_DEBUG("skipping info-only driver %s\n", 557 device_get_nameunit(devs[i])); 558 } 559 continue; 560 } 561 set_count = MAX_SETTINGS; 562 error = CPUFREQ_DRV_SETTINGS(devs[i], sets, &set_count); 563 if (error || set_count == 0) 564 continue; 565 566 /* Add the settings to our absolute/relative lists. */ 567 switch (type & CPUFREQ_TYPE_MASK) { 568 case CPUFREQ_TYPE_ABSOLUTE: 569 error = cpufreq_insert_abs(sc, sets, set_count); 570 break; 571 case CPUFREQ_TYPE_RELATIVE: 572 CF_DEBUG("adding %d relative settings\n", set_count); 573 set_arr = malloc(sizeof(*set_arr), M_TEMP, M_NOWAIT); 574 if (set_arr == NULL) { 575 error = ENOMEM; 576 goto out; 577 } 578 bcopy(sets, set_arr->sets, set_count * sizeof(*sets)); 579 set_arr->count = set_count; 580 TAILQ_INSERT_TAIL(&rel_sets, set_arr, link); 581 break; 582 default: 583 error = EINVAL; 584 } 585 if (error) 586 goto out; 587 } 588 589 /* 590 * If there are no absolute levels, create a fake one at 100%. We 591 * then cache the clockrate for later use as our base frequency. 592 */ 593 if (TAILQ_EMPTY(&sc->all_levels)) { 594 if (sc->max_mhz == CPUFREQ_VAL_UNKNOWN) { 595 sc->max_mhz = cpu_get_nominal_mhz(dev); 596 /* 597 * If the CPU can't report a rate for 100%, hope 598 * the CPU is running at its nominal rate right now, 599 * and use that instead. 600 */ 601 if (sc->max_mhz <= 0) { 602 pc = cpu_get_pcpu(dev); 603 cpu_est_clockrate(pc->pc_cpuid, &rate); 604 sc->max_mhz = rate / 1000000; 605 } 606 } 607 memset(&sets[0], CPUFREQ_VAL_UNKNOWN, sizeof(*sets)); 608 sets[0].freq = sc->max_mhz; 609 sets[0].dev = NULL; 610 error = cpufreq_insert_abs(sc, sets, 1); 611 if (error) 612 goto out; 613 } 614 615 /* Create a combined list of absolute + relative levels. */ 616 TAILQ_FOREACH(set_arr, &rel_sets, link) 617 cpufreq_expand_set(sc, set_arr); 618 619 /* If the caller doesn't have enough space, return the actual count. */ 620 if (sc->all_count > *count) { 621 *count = sc->all_count; 622 error = E2BIG; 623 goto out; 624 } 625 626 /* Finally, output the list of levels. */ 627 i = 0; 628 TAILQ_FOREACH(lev, &sc->all_levels, link) { 629 630 /* Skip levels that have a frequency that is too low. */ 631 if (lev->total_set.freq < cf_lowest_freq) { 632 sc->all_count--; 633 continue; 634 } 635 636 levels[i] = *lev; 637 i++; 638 } 639 *count = sc->all_count; 640 error = 0; 641 642 out: 643 /* Clear all levels since we regenerate them each time. */ 644 while ((lev = TAILQ_FIRST(&sc->all_levels)) != NULL) { 645 TAILQ_REMOVE(&sc->all_levels, lev, link); 646 free(lev, M_TEMP); 647 } 648 sc->all_count = 0; 649 650 CF_MTX_UNLOCK(&sc->lock); 651 while ((set_arr = TAILQ_FIRST(&rel_sets)) != NULL) { 652 TAILQ_REMOVE(&rel_sets, set_arr, link); 653 free(set_arr, M_TEMP); 654 } 655 free(devs, M_TEMP); 656 free(sets, M_TEMP); 657 return (error); 658 } 659 660 /* 661 * Create levels for an array of absolute settings and insert them in 662 * sorted order in the specified list. 663 */ 664 static int 665 cpufreq_insert_abs(struct cpufreq_softc *sc, struct cf_setting *sets, 666 int count) 667 { 668 struct cf_level_lst *list; 669 struct cf_level *level, *search; 670 int i; 671 672 CF_MTX_ASSERT(&sc->lock); 673 674 list = &sc->all_levels; 675 for (i = 0; i < count; i++) { 676 level = malloc(sizeof(*level), M_TEMP, M_NOWAIT | M_ZERO); 677 if (level == NULL) 678 return (ENOMEM); 679 level->abs_set = sets[i]; 680 level->total_set = sets[i]; 681 level->total_set.dev = NULL; 682 sc->all_count++; 683 684 if (TAILQ_EMPTY(list)) { 685 CF_DEBUG("adding abs setting %d at head\n", 686 sets[i].freq); 687 TAILQ_INSERT_HEAD(list, level, link); 688 continue; 689 } 690 691 TAILQ_FOREACH_REVERSE(search, list, cf_level_lst, link) { 692 if (sets[i].freq <= search->total_set.freq) { 693 CF_DEBUG("adding abs setting %d after %d\n", 694 sets[i].freq, search->total_set.freq); 695 TAILQ_INSERT_AFTER(list, search, level, link); 696 break; 697 } 698 } 699 } 700 return (0); 701 } 702 703 /* 704 * Expand a group of relative settings, creating derived levels from them. 705 */ 706 static int 707 cpufreq_expand_set(struct cpufreq_softc *sc, struct cf_setting_array *set_arr) 708 { 709 struct cf_level *fill, *search; 710 struct cf_setting *set; 711 int i; 712 713 CF_MTX_ASSERT(&sc->lock); 714 715 /* 716 * Walk the set of all existing levels in reverse. This is so we 717 * create derived states from the lowest absolute settings first 718 * and discard duplicates created from higher absolute settings. 719 * For instance, a level of 50 Mhz derived from 100 Mhz + 50% is 720 * preferable to 200 Mhz + 25% because absolute settings are more 721 * efficient since they often change the voltage as well. 722 */ 723 TAILQ_FOREACH_REVERSE(search, &sc->all_levels, cf_level_lst, link) { 724 /* Add each setting to the level, duplicating if necessary. */ 725 for (i = 0; i < set_arr->count; i++) { 726 set = &set_arr->sets[i]; 727 728 /* 729 * If this setting is less than 100%, split the level 730 * into two and add this setting to the new level. 731 */ 732 fill = search; 733 if (set->freq < 10000) { 734 fill = cpufreq_dup_set(sc, search, set); 735 736 /* 737 * The new level was a duplicate of an existing 738 * level or its absolute setting is too high 739 * so we freed it. For example, we discard a 740 * derived level of 1000 MHz/25% if a level 741 * of 500 MHz/100% already exists. 742 */ 743 if (fill == NULL) 744 break; 745 } 746 747 /* Add this setting to the existing or new level. */ 748 KASSERT(fill->rel_count < MAX_SETTINGS, 749 ("cpufreq: too many relative drivers (%d)", 750 MAX_SETTINGS)); 751 fill->rel_set[fill->rel_count] = *set; 752 fill->rel_count++; 753 CF_DEBUG( 754 "expand set added rel setting %d%% to %d level\n", 755 set->freq / 100, fill->total_set.freq); 756 } 757 } 758 759 return (0); 760 } 761 762 static struct cf_level * 763 cpufreq_dup_set(struct cpufreq_softc *sc, struct cf_level *dup, 764 struct cf_setting *set) 765 { 766 struct cf_level_lst *list; 767 struct cf_level *fill, *itr; 768 struct cf_setting *fill_set, *itr_set; 769 int i; 770 771 CF_MTX_ASSERT(&sc->lock); 772 773 /* 774 * Create a new level, copy it from the old one, and update the 775 * total frequency and power by the percentage specified in the 776 * relative setting. 777 */ 778 fill = malloc(sizeof(*fill), M_TEMP, M_NOWAIT); 779 if (fill == NULL) 780 return (NULL); 781 *fill = *dup; 782 fill_set = &fill->total_set; 783 fill_set->freq = 784 ((uint64_t)fill_set->freq * set->freq) / 10000; 785 if (fill_set->power != CPUFREQ_VAL_UNKNOWN) { 786 fill_set->power = ((uint64_t)fill_set->power * set->freq) 787 / 10000; 788 } 789 if (set->lat != CPUFREQ_VAL_UNKNOWN) { 790 if (fill_set->lat != CPUFREQ_VAL_UNKNOWN) 791 fill_set->lat += set->lat; 792 else 793 fill_set->lat = set->lat; 794 } 795 CF_DEBUG("dup set considering derived setting %d\n", fill_set->freq); 796 797 /* 798 * If we copied an old level that we already modified (say, at 100%), 799 * we need to remove that setting before adding this one. Since we 800 * process each setting array in order, we know any settings for this 801 * driver will be found at the end. 802 */ 803 for (i = fill->rel_count; i != 0; i--) { 804 if (fill->rel_set[i - 1].dev != set->dev) 805 break; 806 CF_DEBUG("removed last relative driver: %s\n", 807 device_get_nameunit(set->dev)); 808 fill->rel_count--; 809 } 810 811 /* 812 * Insert the new level in sorted order. If it is a duplicate of an 813 * existing level (1) or has an absolute setting higher than the 814 * existing level (2), do not add it. We can do this since any such 815 * level is guaranteed use less power. For example (1), a level with 816 * one absolute setting of 800 Mhz uses less power than one composed 817 * of an absolute setting of 1600 Mhz and a relative setting at 50%. 818 * Also for example (2), a level of 800 Mhz/75% is preferable to 819 * 1600 Mhz/25% even though the latter has a lower total frequency. 820 */ 821 list = &sc->all_levels; 822 KASSERT(!TAILQ_EMPTY(list), ("all levels list empty in dup set")); 823 TAILQ_FOREACH_REVERSE(itr, list, cf_level_lst, link) { 824 itr_set = &itr->total_set; 825 if (CPUFREQ_CMP(fill_set->freq, itr_set->freq)) { 826 CF_DEBUG("dup set rejecting %d (dupe)\n", 827 fill_set->freq); 828 itr = NULL; 829 break; 830 } else if (fill_set->freq < itr_set->freq) { 831 if (fill->abs_set.freq <= itr->abs_set.freq) { 832 CF_DEBUG( 833 "dup done, inserting new level %d after %d\n", 834 fill_set->freq, itr_set->freq); 835 TAILQ_INSERT_AFTER(list, itr, fill, link); 836 sc->all_count++; 837 } else { 838 CF_DEBUG("dup set rejecting %d (abs too big)\n", 839 fill_set->freq); 840 itr = NULL; 841 } 842 break; 843 } 844 } 845 846 /* We didn't find a good place for this new level so free it. */ 847 if (itr == NULL) { 848 CF_DEBUG("dup set freeing new level %d (not optimal)\n", 849 fill_set->freq); 850 free(fill, M_TEMP); 851 fill = NULL; 852 } 853 854 return (fill); 855 } 856 857 static int 858 cpufreq_curr_sysctl(SYSCTL_HANDLER_ARGS) 859 { 860 struct cpufreq_softc *sc; 861 struct cf_level *levels; 862 int best, count, diff, bdiff, devcount, error, freq, i, n; 863 device_t *devs; 864 865 devs = NULL; 866 sc = oidp->oid_arg1; 867 levels = sc->levels_buf; 868 869 error = CPUFREQ_GET(sc->dev, &levels[0]); 870 if (error) 871 goto out; 872 freq = levels[0].total_set.freq; 873 error = sysctl_handle_int(oidp, &freq, 0, req); 874 if (error != 0 || req->newptr == NULL) 875 goto out; 876 877 /* 878 * While we only call cpufreq_get() on one device (assuming all 879 * CPUs have equal levels), we call cpufreq_set() on all CPUs. 880 * This is needed for some MP systems. 881 */ 882 error = devclass_get_devices(cpufreq_dc, &devs, &devcount); 883 if (error) 884 goto out; 885 for (n = 0; n < devcount; n++) { 886 count = CF_MAX_LEVELS; 887 error = CPUFREQ_LEVELS(devs[n], levels, &count); 888 if (error) { 889 if (error == E2BIG) 890 printf( 891 "cpufreq: need to increase CF_MAX_LEVELS\n"); 892 break; 893 } 894 best = 0; 895 bdiff = 1 << 30; 896 for (i = 0; i < count; i++) { 897 diff = abs(levels[i].total_set.freq - freq); 898 if (diff < bdiff) { 899 bdiff = diff; 900 best = i; 901 } 902 } 903 error = CPUFREQ_SET(devs[n], &levels[best], CPUFREQ_PRIO_USER); 904 } 905 906 out: 907 if (devs) 908 free(devs, M_TEMP); 909 return (error); 910 } 911 912 static int 913 cpufreq_levels_sysctl(SYSCTL_HANDLER_ARGS) 914 { 915 struct cpufreq_softc *sc; 916 struct cf_level *levels; 917 struct cf_setting *set; 918 struct sbuf sb; 919 int count, error, i; 920 921 sc = oidp->oid_arg1; 922 sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND); 923 924 /* Get settings from the device and generate the output string. */ 925 count = CF_MAX_LEVELS; 926 levels = sc->levels_buf; 927 if (levels == NULL) { 928 sbuf_delete(&sb); 929 return (ENOMEM); 930 } 931 error = CPUFREQ_LEVELS(sc->dev, levels, &count); 932 if (error) { 933 if (error == E2BIG) 934 printf("cpufreq: need to increase CF_MAX_LEVELS\n"); 935 goto out; 936 } 937 if (count) { 938 for (i = 0; i < count; i++) { 939 set = &levels[i].total_set; 940 sbuf_printf(&sb, "%d/%d ", set->freq, set->power); 941 } 942 } else 943 sbuf_cpy(&sb, "0"); 944 sbuf_trim(&sb); 945 sbuf_finish(&sb); 946 error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req); 947 948 out: 949 sbuf_delete(&sb); 950 return (error); 951 } 952 953 static int 954 cpufreq_settings_sysctl(SYSCTL_HANDLER_ARGS) 955 { 956 device_t dev; 957 struct cf_setting *sets; 958 struct sbuf sb; 959 int error, i, set_count; 960 961 dev = oidp->oid_arg1; 962 sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND); 963 964 /* Get settings from the device and generate the output string. */ 965 set_count = MAX_SETTINGS; 966 sets = malloc(set_count * sizeof(*sets), M_TEMP, M_NOWAIT); 967 if (sets == NULL) { 968 sbuf_delete(&sb); 969 return (ENOMEM); 970 } 971 error = CPUFREQ_DRV_SETTINGS(dev, sets, &set_count); 972 if (error) 973 goto out; 974 if (set_count) { 975 for (i = 0; i < set_count; i++) 976 sbuf_printf(&sb, "%d/%d ", sets[i].freq, sets[i].power); 977 } else 978 sbuf_cpy(&sb, "0"); 979 sbuf_trim(&sb); 980 sbuf_finish(&sb); 981 error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req); 982 983 out: 984 free(sets, M_TEMP); 985 sbuf_delete(&sb); 986 return (error); 987 } 988 989 int 990 cpufreq_register(device_t dev) 991 { 992 struct cpufreq_softc *sc; 993 device_t cf_dev, cpu_dev; 994 995 /* Add a sysctl to get each driver's settings separately. */ 996 SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev), 997 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), 998 OID_AUTO, "freq_settings", CTLTYPE_STRING | CTLFLAG_RD, dev, 0, 999 cpufreq_settings_sysctl, "A", "CPU frequency driver settings"); 1000 1001 /* 1002 * Add only one cpufreq device to each CPU. Currently, all CPUs 1003 * must offer the same levels and be switched at the same time. 1004 */ 1005 cpu_dev = device_get_parent(dev); 1006 if ((cf_dev = device_find_child(cpu_dev, "cpufreq", -1))) { 1007 sc = device_get_softc(cf_dev); 1008 sc->max_mhz = CPUFREQ_VAL_UNKNOWN; 1009 return (0); 1010 } 1011 1012 /* Add the child device and possibly sysctls. */ 1013 cf_dev = BUS_ADD_CHILD(cpu_dev, 0, "cpufreq", -1); 1014 if (cf_dev == NULL) 1015 return (ENOMEM); 1016 device_quiet(cf_dev); 1017 1018 return (device_probe_and_attach(cf_dev)); 1019 } 1020 1021 int 1022 cpufreq_unregister(device_t dev) 1023 { 1024 device_t cf_dev, *devs; 1025 int cfcount, devcount, error, i, type; 1026 1027 /* 1028 * If this is the last cpufreq child device, remove the control 1029 * device as well. We identify cpufreq children by calling a method 1030 * they support. 1031 */ 1032 error = device_get_children(device_get_parent(dev), &devs, &devcount); 1033 if (error) 1034 return (error); 1035 cf_dev = device_find_child(device_get_parent(dev), "cpufreq", -1); 1036 if (cf_dev == NULL) { 1037 device_printf(dev, 1038 "warning: cpufreq_unregister called with no cpufreq device active\n"); 1039 free(devs, M_TEMP); 1040 return (0); 1041 } 1042 cfcount = 0; 1043 for (i = 0; i < devcount; i++) { 1044 if (!device_is_attached(devs[i])) 1045 continue; 1046 if (CPUFREQ_DRV_TYPE(devs[i], &type) == 0) 1047 cfcount++; 1048 } 1049 if (cfcount <= 1) 1050 device_delete_child(device_get_parent(cf_dev), cf_dev); 1051 free(devs, M_TEMP); 1052 1053 return (0); 1054 } 1055 1056 int 1057 cpufreq_settings_changed(device_t dev) 1058 { 1059 1060 EVENTHANDLER_INVOKE(cpufreq_levels_changed, 1061 device_get_unit(device_get_parent(dev))); 1062 return (0); 1063 } 1064