kern_cpu.c revision 167905
1141240Snjl/*- 2167905Snjl * Copyright (c) 2004-2007 Nate Lawson (SDG) 3141240Snjl * All rights reserved. 4141240Snjl * 5141240Snjl * Redistribution and use in source and binary forms, with or without 6141240Snjl * modification, are permitted provided that the following conditions 7141240Snjl * are met: 8141240Snjl * 1. Redistributions of source code must retain the above copyright 9141240Snjl * notice, this list of conditions and the following disclaimer. 10141240Snjl * 2. Redistributions in binary form must reproduce the above copyright 11141240Snjl * notice, this list of conditions and the following disclaimer in the 12141240Snjl * documentation and/or other materials provided with the distribution. 13141240Snjl * 14141240Snjl * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15141240Snjl * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16141240Snjl * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17141240Snjl * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18141240Snjl * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19141240Snjl * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20141240Snjl * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21141240Snjl * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22141240Snjl * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23141240Snjl * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24141240Snjl * SUCH DAMAGE. 25141240Snjl */ 26141240Snjl 27141240Snjl#include <sys/cdefs.h> 28141240Snjl__FBSDID("$FreeBSD: head/sys/kern/kern_cpu.c 167905 2007-03-26 18:03:29Z njl $"); 29141240Snjl 30141240Snjl#include <sys/param.h> 31141240Snjl#include <sys/bus.h> 32141240Snjl#include <sys/cpu.h> 33141240Snjl#include <sys/eventhandler.h> 34141240Snjl#include <sys/kernel.h> 35142603Snjl#include <sys/lock.h> 36141240Snjl#include <sys/malloc.h> 37141240Snjl#include <sys/module.h> 38141240Snjl#include <sys/proc.h> 39141240Snjl#include <sys/queue.h> 40141240Snjl#include <sys/sched.h> 41141240Snjl#include <sys/sysctl.h> 42141240Snjl#include <sys/systm.h> 43141240Snjl#include <sys/sbuf.h> 44142603Snjl#include <sys/sx.h> 45141814Snjl#include <sys/timetc.h> 46167905Snjl#include <sys/taskqueue.h> 47141240Snjl 48141240Snjl#include "cpufreq_if.h" 49141240Snjl 50141240Snjl/* 51141240Snjl * Common CPU frequency glue code. Drivers for specific hardware can 52141240Snjl * attach this interface to allow users to get/set the CPU frequency. 53141240Snjl */ 54141240Snjl 55141240Snjl/* 56141240Snjl * Number of levels we can handle. Levels are synthesized from settings 57142395Snjl * so for M settings and N drivers, there may be M*N levels. 58141240Snjl */ 59142395Snjl#define CF_MAX_LEVELS 64 60141240Snjl 61150847Sumestruct cf_saved_freq { 62150847Sume struct cf_level level; 63150847Sume int priority; 64150847Sume SLIST_ENTRY(cf_saved_freq) link; 65150847Sume}; 66150847Sume 67141240Snjlstruct cpufreq_softc { 68142603Snjl struct sx lock; 69141240Snjl struct cf_level curr_level; 70141923Snjl int curr_priority; 71150847Sume SLIST_HEAD(, cf_saved_freq) saved_freq; 72141923Snjl struct cf_level_lst all_levels; 73141413Snjl int all_count; 74141945Snjl int max_mhz; 75141240Snjl device_t dev; 76141240Snjl struct sysctl_ctx_list sysctl_ctx; 77167905Snjl struct task startup_task; 78141240Snjl}; 79141240Snjl 80141240Snjlstruct cf_setting_array { 81141240Snjl struct cf_setting sets[MAX_SETTINGS]; 82141240Snjl int count; 83141240Snjl TAILQ_ENTRY(cf_setting_array) link; 84141240Snjl}; 85141240Snjl 86141240SnjlTAILQ_HEAD(cf_setting_lst, cf_setting_array); 87141240Snjl 88142603Snjl#define CF_MTX_INIT(x) sx_init((x), "cpufreq lock") 89142603Snjl#define CF_MTX_LOCK(x) sx_xlock((x)) 90142603Snjl#define CF_MTX_UNLOCK(x) sx_xunlock((x)) 91142603Snjl#define CF_MTX_ASSERT(x) sx_assert((x), SX_XLOCKED) 92142603Snjl 93144876Snjl#define CF_DEBUG(msg...) do { \ 94144876Snjl if (cf_verbose) \ 95144876Snjl printf("cpufreq: " msg); \ 96144876Snjl } while (0) 97144876Snjl 98141240Snjlstatic int cpufreq_attach(device_t dev); 99167905Snjlstatic void cpufreq_startup_task(void *ctx, int pending); 100141240Snjlstatic int cpufreq_detach(device_t dev); 101141240Snjlstatic int cf_set_method(device_t dev, const struct cf_level *level, 102141240Snjl int priority); 103141240Snjlstatic int cf_get_method(device_t dev, struct cf_level *level); 104141240Snjlstatic int cf_levels_method(device_t dev, struct cf_level *levels, 105141240Snjl int *count); 106141413Snjlstatic int cpufreq_insert_abs(struct cpufreq_softc *sc, 107141240Snjl struct cf_setting *sets, int count); 108141413Snjlstatic int cpufreq_expand_set(struct cpufreq_softc *sc, 109141413Snjl struct cf_setting_array *set_arr); 110141413Snjlstatic struct cf_level *cpufreq_dup_set(struct cpufreq_softc *sc, 111141413Snjl struct cf_level *dup, struct cf_setting *set); 112141240Snjlstatic int cpufreq_curr_sysctl(SYSCTL_HANDLER_ARGS); 113141240Snjlstatic int cpufreq_levels_sysctl(SYSCTL_HANDLER_ARGS); 114142114Snjlstatic int cpufreq_settings_sysctl(SYSCTL_HANDLER_ARGS); 115141240Snjl 116141240Snjlstatic device_method_t cpufreq_methods[] = { 117141240Snjl DEVMETHOD(device_probe, bus_generic_probe), 118141240Snjl DEVMETHOD(device_attach, cpufreq_attach), 119141240Snjl DEVMETHOD(device_detach, cpufreq_detach), 120141240Snjl 121141240Snjl DEVMETHOD(cpufreq_set, cf_set_method), 122141240Snjl DEVMETHOD(cpufreq_get, cf_get_method), 123141240Snjl DEVMETHOD(cpufreq_levels, cf_levels_method), 124141240Snjl {0, 0} 125141240Snjl}; 126141240Snjlstatic driver_t cpufreq_driver = { 127141240Snjl "cpufreq", cpufreq_methods, sizeof(struct cpufreq_softc) 128141240Snjl}; 129141240Snjlstatic devclass_t cpufreq_dc; 130141240SnjlDRIVER_MODULE(cpufreq, cpu, cpufreq_driver, cpufreq_dc, 0, 0); 131141240Snjl 132142590Snjlstatic int cf_lowest_freq; 133144876Snjlstatic int cf_verbose; 134142590SnjlTUNABLE_INT("debug.cpufreq.lowest", &cf_lowest_freq); 135144876SnjlTUNABLE_INT("debug.cpufreq.verbose", &cf_verbose); 136142590SnjlSYSCTL_NODE(_debug, OID_AUTO, cpufreq, CTLFLAG_RD, NULL, "cpufreq debugging"); 137142590SnjlSYSCTL_INT(_debug_cpufreq, OID_AUTO, lowest, CTLFLAG_RW, &cf_lowest_freq, 1, 138142590Snjl "Don't provide levels below this frequency."); 139144876SnjlSYSCTL_INT(_debug_cpufreq, OID_AUTO, verbose, CTLFLAG_RW, &cf_verbose, 1, 140144876Snjl "Print verbose debugging messages"); 141142590Snjl 142141240Snjlstatic int 143141240Snjlcpufreq_attach(device_t dev) 144141240Snjl{ 145141240Snjl struct cpufreq_softc *sc; 146141240Snjl device_t parent; 147141240Snjl int numdevs; 148141240Snjl 149144876Snjl CF_DEBUG("initializing %s\n", device_get_nameunit(dev)); 150141240Snjl sc = device_get_softc(dev); 151141240Snjl parent = device_get_parent(dev); 152141240Snjl sc->dev = dev; 153141240Snjl sysctl_ctx_init(&sc->sysctl_ctx); 154141240Snjl TAILQ_INIT(&sc->all_levels); 155142603Snjl CF_MTX_INIT(&sc->lock); 156141240Snjl sc->curr_level.total_set.freq = CPUFREQ_VAL_UNKNOWN; 157150847Sume SLIST_INIT(&sc->saved_freq); 158141945Snjl sc->max_mhz = CPUFREQ_VAL_UNKNOWN; 159141240Snjl 160141240Snjl /* 161141240Snjl * Only initialize one set of sysctls for all CPUs. In the future, 162141240Snjl * if multiple CPUs can have different settings, we can move these 163141240Snjl * sysctls to be under every CPU instead of just the first one. 164141240Snjl */ 165141240Snjl numdevs = devclass_get_count(cpufreq_dc); 166141240Snjl if (numdevs > 1) 167141240Snjl return (0); 168141240Snjl 169144876Snjl CF_DEBUG("initializing one-time data for %s\n", 170144876Snjl device_get_nameunit(dev)); 171141240Snjl SYSCTL_ADD_PROC(&sc->sysctl_ctx, 172141240Snjl SYSCTL_CHILDREN(device_get_sysctl_tree(parent)), 173141240Snjl OID_AUTO, "freq", CTLTYPE_INT | CTLFLAG_RW, sc, 0, 174141240Snjl cpufreq_curr_sysctl, "I", "Current CPU frequency"); 175141240Snjl SYSCTL_ADD_PROC(&sc->sysctl_ctx, 176141240Snjl SYSCTL_CHILDREN(device_get_sysctl_tree(parent)), 177141240Snjl OID_AUTO, "freq_levels", CTLTYPE_STRING | CTLFLAG_RD, sc, 0, 178141240Snjl cpufreq_levels_sysctl, "A", "CPU frequency levels"); 179141240Snjl 180167905Snjl /* 181167905Snjl * Queue a one-shot broadcast that levels have changed. 182167905Snjl * It will run once the system has completed booting. 183167905Snjl */ 184167905Snjl TASK_INIT(&sc->startup_task, 0, cpufreq_startup_task, dev); 185167905Snjl taskqueue_enqueue(taskqueue_thread, &sc->startup_task); 186167905Snjl 187141240Snjl return (0); 188141240Snjl} 189141240Snjl 190167905Snjl/* Handle any work to be done for all drivers that attached during boot. */ 191167905Snjlstatic void 192167905Snjlcpufreq_startup_task(void *ctx, int pending) 193167905Snjl{ 194167905Snjl 195167905Snjl cpufreq_settings_changed((device_t)ctx); 196167905Snjl} 197167905Snjl 198141240Snjlstatic int 199141240Snjlcpufreq_detach(device_t dev) 200141240Snjl{ 201141240Snjl struct cpufreq_softc *sc; 202150847Sume struct cf_saved_freq *saved_freq; 203141240Snjl int numdevs; 204141240Snjl 205144876Snjl CF_DEBUG("shutdown %s\n", device_get_nameunit(dev)); 206141240Snjl sc = device_get_softc(dev); 207141240Snjl sysctl_ctx_free(&sc->sysctl_ctx); 208141240Snjl 209150847Sume while ((saved_freq = SLIST_FIRST(&sc->saved_freq)) != NULL) { 210150847Sume SLIST_REMOVE_HEAD(&sc->saved_freq, link); 211150847Sume free(saved_freq, M_TEMP); 212150847Sume } 213150847Sume 214141240Snjl /* Only clean up these resources when the last device is detaching. */ 215141240Snjl numdevs = devclass_get_count(cpufreq_dc); 216144876Snjl if (numdevs == 1) { 217144876Snjl CF_DEBUG("final shutdown for %s\n", device_get_nameunit(dev)); 218144876Snjl } 219141240Snjl 220141240Snjl return (0); 221141240Snjl} 222141240Snjl 223141240Snjlstatic int 224141240Snjlcf_set_method(device_t dev, const struct cf_level *level, int priority) 225141240Snjl{ 226141240Snjl struct cpufreq_softc *sc; 227141240Snjl const struct cf_setting *set; 228150847Sume struct cf_saved_freq *saved_freq, *curr_freq; 229141814Snjl struct pcpu *pc; 230141814Snjl int cpu_id, error, i; 231141240Snjl 232141240Snjl sc = device_get_softc(dev); 233142603Snjl error = 0; 234142603Snjl set = NULL; 235150847Sume saved_freq = NULL; 236141240Snjl 237167905Snjl /* We are going to change levels so notify the pre-change handler. */ 238167905Snjl EVENTHANDLER_INVOKE(cpufreq_pre_change, level, &error); 239167905Snjl if (error != 0) { 240167905Snjl EVENTHANDLER_INVOKE(cpufreq_post_change, level, error); 241167905Snjl return (error); 242156228Smnag } 243141814Snjl 244150847Sume CF_MTX_LOCK(&sc->lock); 245150847Sume 246141923Snjl /* 247150847Sume * If the requested level has a lower priority, don't allow 248150847Sume * the new level right now. 249150847Sume */ 250150847Sume if (priority < sc->curr_priority) { 251150847Sume CF_DEBUG("ignoring, curr prio %d less than %d\n", priority, 252150847Sume sc->curr_priority); 253150847Sume error = EPERM; 254150847Sume goto out; 255150847Sume } 256150847Sume 257150847Sume /* 258141923Snjl * If the caller didn't specify a level and one is saved, prepare to 259141923Snjl * restore the saved level. If none has been saved, return an error. 260141923Snjl */ 261141923Snjl if (level == NULL) { 262150847Sume saved_freq = SLIST_FIRST(&sc->saved_freq); 263150847Sume if (saved_freq == NULL) { 264144876Snjl CF_DEBUG("NULL level, no saved level\n"); 265142603Snjl error = ENXIO; 266142603Snjl goto out; 267142603Snjl } 268150847Sume level = &saved_freq->level; 269150847Sume priority = saved_freq->priority; 270150847Sume CF_DEBUG("restoring saved level, freq %d prio %d\n", 271150847Sume level->total_set.freq, priority); 272142603Snjl } 273141923Snjl 274142590Snjl /* Reject levels that are below our specified threshold. */ 275148972Snjl if (level->total_set.freq < cf_lowest_freq) { 276144876Snjl CF_DEBUG("rejecting freq %d, less than %d limit\n", 277144876Snjl level->total_set.freq, cf_lowest_freq); 278142603Snjl error = EINVAL; 279142603Snjl goto out; 280142603Snjl } 281142590Snjl 282141240Snjl /* If already at this level, just return. */ 283144876Snjl if (CPUFREQ_CMP(sc->curr_level.total_set.freq, level->total_set.freq)) { 284144876Snjl CF_DEBUG("skipping freq %d, same as current level %d\n", 285144876Snjl level->total_set.freq, sc->curr_level.total_set.freq); 286149239Sume goto skip; 287144876Snjl } 288141240Snjl 289141240Snjl /* First, set the absolute frequency via its driver. */ 290141240Snjl set = &level->abs_set; 291141240Snjl if (set->dev) { 292141240Snjl if (!device_is_attached(set->dev)) { 293141240Snjl error = ENXIO; 294141240Snjl goto out; 295141240Snjl } 296141943Snjl 297141943Snjl /* Bind to the target CPU before switching, if necessary. */ 298141943Snjl cpu_id = PCPU_GET(cpuid); 299141943Snjl pc = cpu_get_pcpu(set->dev); 300141943Snjl if (cpu_id != pc->pc_cpuid) { 301141943Snjl mtx_lock_spin(&sched_lock); 302141943Snjl sched_bind(curthread, pc->pc_cpuid); 303141943Snjl mtx_unlock_spin(&sched_lock); 304141943Snjl } 305144876Snjl CF_DEBUG("setting abs freq %d on %s (cpu %d)\n", set->freq, 306144876Snjl device_get_nameunit(set->dev), PCPU_GET(cpuid)); 307141240Snjl error = CPUFREQ_DRV_SET(set->dev, set); 308141943Snjl if (cpu_id != pc->pc_cpuid) { 309141943Snjl mtx_lock_spin(&sched_lock); 310141943Snjl sched_unbind(curthread); 311141943Snjl mtx_unlock_spin(&sched_lock); 312141943Snjl } 313141240Snjl if (error) { 314141240Snjl goto out; 315141240Snjl } 316141240Snjl } 317141240Snjl 318141413Snjl /* Next, set any/all relative frequencies via their drivers. */ 319141413Snjl for (i = 0; i < level->rel_count; i++) { 320141413Snjl set = &level->rel_set[i]; 321141413Snjl if (!device_is_attached(set->dev)) { 322141413Snjl error = ENXIO; 323141413Snjl goto out; 324141413Snjl } 325141943Snjl 326141943Snjl /* Bind to the target CPU before switching, if necessary. */ 327141943Snjl cpu_id = PCPU_GET(cpuid); 328141943Snjl pc = cpu_get_pcpu(set->dev); 329141943Snjl if (cpu_id != pc->pc_cpuid) { 330141943Snjl mtx_lock_spin(&sched_lock); 331141943Snjl sched_bind(curthread, pc->pc_cpuid); 332141943Snjl mtx_unlock_spin(&sched_lock); 333141943Snjl } 334144876Snjl CF_DEBUG("setting rel freq %d on %s (cpu %d)\n", set->freq, 335144876Snjl device_get_nameunit(set->dev), PCPU_GET(cpuid)); 336141413Snjl error = CPUFREQ_DRV_SET(set->dev, set); 337141943Snjl if (cpu_id != pc->pc_cpuid) { 338141943Snjl mtx_lock_spin(&sched_lock); 339141943Snjl sched_unbind(curthread); 340141943Snjl mtx_unlock_spin(&sched_lock); 341141943Snjl } 342141413Snjl if (error) { 343141413Snjl /* XXX Back out any successful setting? */ 344141413Snjl goto out; 345141413Snjl } 346141413Snjl } 347141240Snjl 348149239Sumeskip: 349141923Snjl /* 350141923Snjl * Before recording the current level, check if we're going to a 351150847Sume * higher priority. If so, save the previous level and priority. 352141923Snjl */ 353141923Snjl if (sc->curr_level.total_set.freq != CPUFREQ_VAL_UNKNOWN && 354150847Sume priority > sc->curr_priority) { 355144876Snjl CF_DEBUG("saving level, freq %d prio %d\n", 356144876Snjl sc->curr_level.total_set.freq, sc->curr_priority); 357150847Sume curr_freq = malloc(sizeof(*curr_freq), M_TEMP, M_NOWAIT); 358150847Sume if (curr_freq == NULL) { 359150847Sume error = ENOMEM; 360150847Sume goto out; 361150847Sume } 362150847Sume curr_freq->level = sc->curr_level; 363150847Sume curr_freq->priority = sc->curr_priority; 364150847Sume SLIST_INSERT_HEAD(&sc->saved_freq, curr_freq, link); 365141923Snjl } 366141240Snjl sc->curr_level = *level; 367141923Snjl sc->curr_priority = priority; 368141240Snjl 369150847Sume /* If we were restoring a saved state, reset it to "unused". */ 370150847Sume if (saved_freq != NULL) { 371150847Sume CF_DEBUG("resetting saved level\n"); 372150847Sume sc->curr_level.total_set.freq = CPUFREQ_VAL_UNKNOWN; 373150847Sume SLIST_REMOVE_HEAD(&sc->saved_freq, link); 374150847Sume free(saved_freq, M_TEMP); 375150847Sume } 376150847Sume 377141240Snjlout: 378142603Snjl CF_MTX_UNLOCK(&sc->lock); 379167905Snjl 380167905Snjl /* 381167905Snjl * We changed levels (or attempted to) so notify the post-change 382167905Snjl * handler of new frequency or error. 383167905Snjl */ 384167905Snjl EVENTHANDLER_INVOKE(cpufreq_post_change, level, error); 385142603Snjl if (error && set) 386141240Snjl device_printf(set->dev, "set freq failed, err %d\n", error); 387167905Snjl 388141240Snjl return (error); 389141240Snjl} 390141240Snjl 391141240Snjlstatic int 392141240Snjlcf_get_method(device_t dev, struct cf_level *level) 393141240Snjl{ 394141240Snjl struct cpufreq_softc *sc; 395141240Snjl struct cf_level *levels; 396141240Snjl struct cf_setting *curr_set, set; 397141240Snjl struct pcpu *pc; 398141240Snjl device_t *devs; 399141240Snjl int count, error, i, numdevs; 400141240Snjl uint64_t rate; 401141240Snjl 402141240Snjl sc = device_get_softc(dev); 403142603Snjl error = 0; 404141240Snjl levels = NULL; 405141240Snjl 406141240Snjl /* If we already know the current frequency, we're done. */ 407142603Snjl CF_MTX_LOCK(&sc->lock); 408142603Snjl curr_set = &sc->curr_level.total_set; 409144876Snjl if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) { 410144876Snjl CF_DEBUG("get returning known freq %d\n", curr_set->freq); 411141240Snjl goto out; 412144876Snjl } 413142603Snjl CF_MTX_UNLOCK(&sc->lock); 414141240Snjl 415141240Snjl /* 416141240Snjl * We need to figure out the current level. Loop through every 417141240Snjl * driver, getting the current setting. Then, attempt to get a best 418141240Snjl * match of settings against each level. 419141240Snjl */ 420141240Snjl count = CF_MAX_LEVELS; 421141240Snjl levels = malloc(count * sizeof(*levels), M_TEMP, M_NOWAIT); 422141240Snjl if (levels == NULL) 423141240Snjl return (ENOMEM); 424141240Snjl error = CPUFREQ_LEVELS(sc->dev, levels, &count); 425142395Snjl if (error) { 426142395Snjl if (error == E2BIG) 427142395Snjl printf("cpufreq: need to increase CF_MAX_LEVELS\n"); 428142603Snjl free(levels, M_TEMP); 429142603Snjl return (error); 430142395Snjl } 431141240Snjl error = device_get_children(device_get_parent(dev), &devs, &numdevs); 432142603Snjl if (error) { 433142603Snjl free(levels, M_TEMP); 434142603Snjl return (error); 435142603Snjl } 436142603Snjl 437142603Snjl /* 438142603Snjl * Reacquire the lock and search for the given level. 439142603Snjl * 440142603Snjl * XXX Note: this is not quite right since we really need to go 441142603Snjl * through each level and compare both absolute and relative 442142603Snjl * settings for each driver in the system before making a match. 443142603Snjl * The estimation code below catches this case though. 444142603Snjl */ 445142603Snjl CF_MTX_LOCK(&sc->lock); 446141240Snjl for (i = 0; i < numdevs && curr_set->freq == CPUFREQ_VAL_UNKNOWN; i++) { 447141240Snjl if (!device_is_attached(devs[i])) 448141240Snjl continue; 449141240Snjl error = CPUFREQ_DRV_GET(devs[i], &set); 450141240Snjl if (error) 451141240Snjl continue; 452141240Snjl for (i = 0; i < count; i++) { 453141413Snjl if (CPUFREQ_CMP(set.freq, levels[i].total_set.freq)) { 454141240Snjl sc->curr_level = levels[i]; 455141240Snjl break; 456141240Snjl } 457141240Snjl } 458141240Snjl } 459141240Snjl free(devs, M_TEMP); 460144876Snjl if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) { 461144876Snjl CF_DEBUG("get matched freq %d from drivers\n", curr_set->freq); 462141240Snjl goto out; 463144876Snjl } 464141240Snjl 465141240Snjl /* 466141240Snjl * We couldn't find an exact match, so attempt to estimate and then 467141240Snjl * match against a level. 468141240Snjl */ 469141240Snjl pc = cpu_get_pcpu(dev); 470141240Snjl if (pc == NULL) { 471141240Snjl error = ENXIO; 472141240Snjl goto out; 473141240Snjl } 474141240Snjl cpu_est_clockrate(pc->pc_cpuid, &rate); 475141240Snjl rate /= 1000000; 476141240Snjl for (i = 0; i < count; i++) { 477141240Snjl if (CPUFREQ_CMP(rate, levels[i].total_set.freq)) { 478141240Snjl sc->curr_level = levels[i]; 479144876Snjl CF_DEBUG("get estimated freq %d\n", curr_set->freq); 480141240Snjl break; 481141240Snjl } 482141240Snjl } 483141240Snjl 484141240Snjlout: 485142603Snjl if (error == 0) 486142603Snjl *level = sc->curr_level; 487142603Snjl 488142603Snjl CF_MTX_UNLOCK(&sc->lock); 489141240Snjl if (levels) 490141240Snjl free(levels, M_TEMP); 491142603Snjl return (error); 492141240Snjl} 493141240Snjl 494141240Snjlstatic int 495141240Snjlcf_levels_method(device_t dev, struct cf_level *levels, int *count) 496141240Snjl{ 497141413Snjl struct cf_setting_array *set_arr; 498141240Snjl struct cf_setting_lst rel_sets; 499141240Snjl struct cpufreq_softc *sc; 500141240Snjl struct cf_level *lev; 501141240Snjl struct cf_setting *sets; 502141240Snjl struct pcpu *pc; 503141240Snjl device_t *devs; 504141413Snjl int error, i, numdevs, set_count, type; 505141240Snjl uint64_t rate; 506141240Snjl 507141240Snjl if (levels == NULL || count == NULL) 508141240Snjl return (EINVAL); 509141240Snjl 510141240Snjl TAILQ_INIT(&rel_sets); 511141240Snjl sc = device_get_softc(dev); 512141240Snjl error = device_get_children(device_get_parent(dev), &devs, &numdevs); 513141240Snjl if (error) 514141240Snjl return (error); 515141240Snjl sets = malloc(MAX_SETTINGS * sizeof(*sets), M_TEMP, M_NOWAIT); 516141240Snjl if (sets == NULL) { 517141240Snjl free(devs, M_TEMP); 518141240Snjl return (ENOMEM); 519141240Snjl } 520141240Snjl 521141240Snjl /* Get settings from all cpufreq drivers. */ 522142603Snjl CF_MTX_LOCK(&sc->lock); 523141240Snjl for (i = 0; i < numdevs; i++) { 524141824Snjl /* Skip devices that aren't ready. */ 525141240Snjl if (!device_is_attached(devs[i])) 526141240Snjl continue; 527141824Snjl 528141824Snjl /* 529141824Snjl * Get settings, skipping drivers that offer no settings or 530141824Snjl * provide settings for informational purposes only. 531141824Snjl */ 532142032Snjl error = CPUFREQ_DRV_TYPE(devs[i], &type); 533144876Snjl if (error || (type & CPUFREQ_FLAG_INFO_ONLY)) { 534144876Snjl if (error == 0) { 535144876Snjl CF_DEBUG("skipping info-only driver %s\n", 536144876Snjl device_get_nameunit(devs[i])); 537144876Snjl } 538142032Snjl continue; 539144876Snjl } 540141240Snjl set_count = MAX_SETTINGS; 541142032Snjl error = CPUFREQ_DRV_SETTINGS(devs[i], sets, &set_count); 542142032Snjl if (error || set_count == 0) 543141240Snjl continue; 544141413Snjl 545141824Snjl /* Add the settings to our absolute/relative lists. */ 546141814Snjl switch (type & CPUFREQ_TYPE_MASK) { 547141413Snjl case CPUFREQ_TYPE_ABSOLUTE: 548141413Snjl error = cpufreq_insert_abs(sc, sets, set_count); 549141413Snjl break; 550141413Snjl case CPUFREQ_TYPE_RELATIVE: 551144876Snjl CF_DEBUG("adding %d relative settings\n", set_count); 552141413Snjl set_arr = malloc(sizeof(*set_arr), M_TEMP, M_NOWAIT); 553141413Snjl if (set_arr == NULL) { 554141413Snjl error = ENOMEM; 555141413Snjl goto out; 556141413Snjl } 557141413Snjl bcopy(sets, set_arr->sets, set_count * sizeof(*sets)); 558141413Snjl set_arr->count = set_count; 559141413Snjl TAILQ_INSERT_TAIL(&rel_sets, set_arr, link); 560141413Snjl break; 561141413Snjl default: 562141413Snjl error = EINVAL; 563141413Snjl } 564141240Snjl if (error) 565141240Snjl goto out; 566141240Snjl } 567141240Snjl 568141945Snjl /* 569141945Snjl * If there are no absolute levels, create a fake one at 100%. We 570141945Snjl * then cache the clockrate for later use as our base frequency. 571141945Snjl * 572141945Snjl * XXX This assumes that the first time through, if we only have 573141945Snjl * relative drivers, the CPU is currently running at 100%. 574141945Snjl */ 575141240Snjl if (TAILQ_EMPTY(&sc->all_levels)) { 576141945Snjl if (sc->max_mhz == CPUFREQ_VAL_UNKNOWN) { 577141945Snjl pc = cpu_get_pcpu(dev); 578141945Snjl cpu_est_clockrate(pc->pc_cpuid, &rate); 579141945Snjl sc->max_mhz = rate / 1000000; 580141240Snjl } 581141945Snjl memset(&sets[0], CPUFREQ_VAL_UNKNOWN, sizeof(*sets)); 582141945Snjl sets[0].freq = sc->max_mhz; 583141945Snjl sets[0].dev = NULL; 584141413Snjl error = cpufreq_insert_abs(sc, sets, 1); 585141240Snjl if (error) 586141240Snjl goto out; 587141240Snjl } 588141240Snjl 589141413Snjl /* Create a combined list of absolute + relative levels. */ 590141413Snjl TAILQ_FOREACH(set_arr, &rel_sets, link) 591141413Snjl cpufreq_expand_set(sc, set_arr); 592141413Snjl 593141413Snjl /* If the caller doesn't have enough space, return the actual count. */ 594141413Snjl if (sc->all_count > *count) { 595141413Snjl *count = sc->all_count; 596141413Snjl error = E2BIG; 597141413Snjl goto out; 598141413Snjl } 599141413Snjl 600141413Snjl /* Finally, output the list of levels. */ 601141240Snjl i = 0; 602141240Snjl TAILQ_FOREACH(lev, &sc->all_levels, link) { 603142590Snjl /* Skip levels that have a frequency that is too low. */ 604148972Snjl if (lev->total_set.freq < cf_lowest_freq) { 605142590Snjl sc->all_count--; 606142590Snjl continue; 607142590Snjl } 608142590Snjl 609141240Snjl levels[i] = *lev; 610141240Snjl i++; 611141240Snjl } 612141413Snjl *count = sc->all_count; 613141240Snjl error = 0; 614141240Snjl 615141240Snjlout: 616141240Snjl /* Clear all levels since we regenerate them each time. */ 617141240Snjl while ((lev = TAILQ_FIRST(&sc->all_levels)) != NULL) { 618141240Snjl TAILQ_REMOVE(&sc->all_levels, lev, link); 619141240Snjl free(lev, M_TEMP); 620141240Snjl } 621142603Snjl sc->all_count = 0; 622142603Snjl 623142603Snjl CF_MTX_UNLOCK(&sc->lock); 624141413Snjl while ((set_arr = TAILQ_FIRST(&rel_sets)) != NULL) { 625141413Snjl TAILQ_REMOVE(&rel_sets, set_arr, link); 626141413Snjl free(set_arr, M_TEMP); 627141413Snjl } 628141240Snjl free(devs, M_TEMP); 629141240Snjl free(sets, M_TEMP); 630141240Snjl return (error); 631141240Snjl} 632141240Snjl 633141240Snjl/* 634141240Snjl * Create levels for an array of absolute settings and insert them in 635141240Snjl * sorted order in the specified list. 636141240Snjl */ 637141240Snjlstatic int 638141413Snjlcpufreq_insert_abs(struct cpufreq_softc *sc, struct cf_setting *sets, 639141240Snjl int count) 640141240Snjl{ 641141413Snjl struct cf_level_lst *list; 642141240Snjl struct cf_level *level, *search; 643141240Snjl int i; 644141240Snjl 645142603Snjl CF_MTX_ASSERT(&sc->lock); 646142603Snjl 647141413Snjl list = &sc->all_levels; 648141240Snjl for (i = 0; i < count; i++) { 649141240Snjl level = malloc(sizeof(*level), M_TEMP, M_NOWAIT | M_ZERO); 650141240Snjl if (level == NULL) 651141240Snjl return (ENOMEM); 652141240Snjl level->abs_set = sets[i]; 653141413Snjl level->total_set = sets[i]; 654141413Snjl level->total_set.dev = NULL; 655141413Snjl sc->all_count++; 656141240Snjl 657141240Snjl if (TAILQ_EMPTY(list)) { 658144876Snjl CF_DEBUG("adding abs setting %d at head\n", 659144876Snjl sets[i].freq); 660141240Snjl TAILQ_INSERT_HEAD(list, level, link); 661141240Snjl continue; 662141240Snjl } 663141240Snjl 664141240Snjl TAILQ_FOREACH_REVERSE(search, list, cf_level_lst, link) { 665141413Snjl if (sets[i].freq <= search->total_set.freq) { 666144876Snjl CF_DEBUG("adding abs setting %d after %d\n", 667144876Snjl sets[i].freq, search->total_set.freq); 668141240Snjl TAILQ_INSERT_AFTER(list, search, level, link); 669141240Snjl break; 670141240Snjl } 671141240Snjl } 672141240Snjl } 673141240Snjl return (0); 674141240Snjl} 675141240Snjl 676141413Snjl/* 677141413Snjl * Expand a group of relative settings, creating derived levels from them. 678141413Snjl */ 679141240Snjlstatic int 680141413Snjlcpufreq_expand_set(struct cpufreq_softc *sc, struct cf_setting_array *set_arr) 681141413Snjl{ 682141413Snjl struct cf_level *fill, *search; 683141413Snjl struct cf_setting *set; 684141413Snjl int i; 685141413Snjl 686142603Snjl CF_MTX_ASSERT(&sc->lock); 687142603Snjl 688149607Snjl /* 689149607Snjl * Walk the set of all existing levels in reverse. This is so we 690149607Snjl * create derived states from the lowest absolute settings first 691149607Snjl * and discard duplicates created from higher absolute settings. 692149607Snjl * For instance, a level of 50 Mhz derived from 100 Mhz + 50% is 693149607Snjl * preferable to 200 Mhz + 25% because absolute settings are more 694149607Snjl * efficient since they often change the voltage as well. 695149607Snjl */ 696149607Snjl TAILQ_FOREACH_REVERSE(search, &sc->all_levels, cf_level_lst, link) { 697141413Snjl /* Add each setting to the level, duplicating if necessary. */ 698141413Snjl for (i = 0; i < set_arr->count; i++) { 699141413Snjl set = &set_arr->sets[i]; 700141413Snjl 701141413Snjl /* 702141413Snjl * If this setting is less than 100%, split the level 703141413Snjl * into two and add this setting to the new level. 704141413Snjl */ 705141413Snjl fill = search; 706149607Snjl if (set->freq < 10000) { 707141413Snjl fill = cpufreq_dup_set(sc, search, set); 708141413Snjl 709149607Snjl /* 710149607Snjl * The new level was a duplicate of an existing 711149607Snjl * level or its absolute setting is too high 712149607Snjl * so we freed it. For example, we discard a 713149607Snjl * derived level of 1000 MHz/25% if a level 714149607Snjl * of 500 MHz/100% already exists. 715149607Snjl */ 716149607Snjl if (fill == NULL) 717149607Snjl break; 718149607Snjl } 719141413Snjl 720141413Snjl /* Add this setting to the existing or new level. */ 721141413Snjl KASSERT(fill->rel_count < MAX_SETTINGS, 722141413Snjl ("cpufreq: too many relative drivers (%d)", 723141413Snjl MAX_SETTINGS)); 724141413Snjl fill->rel_set[fill->rel_count] = *set; 725141413Snjl fill->rel_count++; 726144876Snjl CF_DEBUG( 727144876Snjl "expand set added rel setting %d%% to %d level\n", 728144876Snjl set->freq / 100, fill->total_set.freq); 729141413Snjl } 730141413Snjl } 731141413Snjl 732141413Snjl return (0); 733141413Snjl} 734141413Snjl 735141413Snjlstatic struct cf_level * 736141413Snjlcpufreq_dup_set(struct cpufreq_softc *sc, struct cf_level *dup, 737141413Snjl struct cf_setting *set) 738141413Snjl{ 739141413Snjl struct cf_level_lst *list; 740141413Snjl struct cf_level *fill, *itr; 741141413Snjl struct cf_setting *fill_set, *itr_set; 742141413Snjl int i; 743141413Snjl 744142603Snjl CF_MTX_ASSERT(&sc->lock); 745142603Snjl 746141413Snjl /* 747141413Snjl * Create a new level, copy it from the old one, and update the 748141413Snjl * total frequency and power by the percentage specified in the 749141413Snjl * relative setting. 750141413Snjl */ 751141413Snjl fill = malloc(sizeof(*fill), M_TEMP, M_NOWAIT); 752141413Snjl if (fill == NULL) 753141413Snjl return (NULL); 754141413Snjl *fill = *dup; 755141413Snjl fill_set = &fill->total_set; 756141413Snjl fill_set->freq = 757141413Snjl ((uint64_t)fill_set->freq * set->freq) / 10000; 758141413Snjl if (fill_set->power != CPUFREQ_VAL_UNKNOWN) { 759141413Snjl fill_set->power = ((uint64_t)fill_set->power * set->freq) 760141413Snjl / 10000; 761141413Snjl } 762141413Snjl if (set->lat != CPUFREQ_VAL_UNKNOWN) { 763141413Snjl if (fill_set->lat != CPUFREQ_VAL_UNKNOWN) 764141413Snjl fill_set->lat += set->lat; 765141413Snjl else 766141413Snjl fill_set->lat = set->lat; 767141413Snjl } 768144876Snjl CF_DEBUG("dup set considering derived setting %d\n", fill_set->freq); 769141413Snjl 770141413Snjl /* 771141413Snjl * If we copied an old level that we already modified (say, at 100%), 772141413Snjl * we need to remove that setting before adding this one. Since we 773141413Snjl * process each setting array in order, we know any settings for this 774141413Snjl * driver will be found at the end. 775141413Snjl */ 776141413Snjl for (i = fill->rel_count; i != 0; i--) { 777141413Snjl if (fill->rel_set[i - 1].dev != set->dev) 778141413Snjl break; 779144876Snjl CF_DEBUG("removed last relative driver: %s\n", 780144876Snjl device_get_nameunit(set->dev)); 781141413Snjl fill->rel_count--; 782141413Snjl } 783141413Snjl 784141413Snjl /* 785149607Snjl * Insert the new level in sorted order. If it is a duplicate of an 786149607Snjl * existing level (1) or has an absolute setting higher than the 787149607Snjl * existing level (2), do not add it. We can do this since any such 788149607Snjl * level is guaranteed use less power. For example (1), a level with 789149607Snjl * one absolute setting of 800 Mhz uses less power than one composed 790149607Snjl * of an absolute setting of 1600 Mhz and a relative setting at 50%. 791149607Snjl * Also for example (2), a level of 800 Mhz/75% is preferable to 792149607Snjl * 1600 Mhz/25% even though the latter has a lower total frequency. 793141413Snjl */ 794141413Snjl list = &sc->all_levels; 795149607Snjl KASSERT(!TAILQ_EMPTY(list), ("all levels list empty in dup set")); 796149607Snjl TAILQ_FOREACH_REVERSE(itr, list, cf_level_lst, link) { 797149607Snjl itr_set = &itr->total_set; 798149724Snjl if (CPUFREQ_CMP(fill_set->freq, itr_set->freq)) { 799149724Snjl CF_DEBUG("dup set rejecting %d (dupe)\n", 800149724Snjl fill_set->freq); 801149724Snjl itr = NULL; 802149607Snjl break; 803149724Snjl } else if (fill_set->freq < itr_set->freq) { 804149724Snjl if (fill->abs_set.freq <= itr->abs_set.freq) { 805149724Snjl CF_DEBUG( 806149724Snjl "dup done, inserting new level %d after %d\n", 807149724Snjl fill_set->freq, itr_set->freq); 808149724Snjl TAILQ_INSERT_AFTER(list, itr, fill, link); 809149724Snjl sc->all_count++; 810149724Snjl } else { 811149724Snjl CF_DEBUG("dup set rejecting %d (abs too big)\n", 812149724Snjl fill_set->freq); 813149724Snjl itr = NULL; 814149724Snjl } 815149724Snjl break; 816141413Snjl } 817141413Snjl } 818141413Snjl 819149607Snjl /* We didn't find a good place for this new level so free it. */ 820149607Snjl if (itr == NULL) { 821149607Snjl CF_DEBUG("dup set freeing new level %d (not optimal)\n", 822149607Snjl fill_set->freq); 823149607Snjl free(fill, M_TEMP); 824149607Snjl fill = NULL; 825149607Snjl } 826149607Snjl 827141413Snjl return (fill); 828141413Snjl} 829141413Snjl 830141413Snjlstatic int 831141240Snjlcpufreq_curr_sysctl(SYSCTL_HANDLER_ARGS) 832141240Snjl{ 833141240Snjl struct cpufreq_softc *sc; 834141240Snjl struct cf_level *levels; 835141814Snjl int count, devcount, error, freq, i, n; 836141814Snjl device_t *devs; 837141240Snjl 838141814Snjl devs = NULL; 839141240Snjl sc = oidp->oid_arg1; 840141814Snjl levels = malloc(CF_MAX_LEVELS * sizeof(*levels), M_TEMP, M_NOWAIT); 841141240Snjl if (levels == NULL) 842141240Snjl return (ENOMEM); 843141240Snjl 844141240Snjl error = CPUFREQ_GET(sc->dev, &levels[0]); 845141240Snjl if (error) 846141240Snjl goto out; 847141240Snjl freq = levels[0].total_set.freq; 848141240Snjl error = sysctl_handle_int(oidp, &freq, 0, req); 849141240Snjl if (error != 0 || req->newptr == NULL) 850141240Snjl goto out; 851141240Snjl 852141814Snjl /* 853141814Snjl * While we only call cpufreq_get() on one device (assuming all 854141814Snjl * CPUs have equal levels), we call cpufreq_set() on all CPUs. 855141814Snjl * This is needed for some MP systems. 856141814Snjl */ 857141814Snjl error = devclass_get_devices(cpufreq_dc, &devs, &devcount); 858141240Snjl if (error) 859141240Snjl goto out; 860141814Snjl for (n = 0; n < devcount; n++) { 861141814Snjl count = CF_MAX_LEVELS; 862141814Snjl error = CPUFREQ_LEVELS(devs[n], levels, &count); 863142395Snjl if (error) { 864142395Snjl if (error == E2BIG) 865142395Snjl printf( 866142395Snjl "cpufreq: need to increase CF_MAX_LEVELS\n"); 867141240Snjl break; 868142395Snjl } 869141814Snjl for (i = 0; i < count; i++) { 870141814Snjl if (CPUFREQ_CMP(levels[i].total_set.freq, freq)) { 871141814Snjl error = CPUFREQ_SET(devs[n], &levels[i], 872141814Snjl CPUFREQ_PRIO_USER); 873141814Snjl break; 874141814Snjl } 875141240Snjl } 876141814Snjl if (i == count) { 877141814Snjl error = EINVAL; 878141814Snjl break; 879141814Snjl } 880141240Snjl } 881141240Snjl 882141240Snjlout: 883141814Snjl if (devs) 884141814Snjl free(devs, M_TEMP); 885141240Snjl if (levels) 886141240Snjl free(levels, M_TEMP); 887141240Snjl return (error); 888141240Snjl} 889141240Snjl 890141240Snjlstatic int 891141240Snjlcpufreq_levels_sysctl(SYSCTL_HANDLER_ARGS) 892141240Snjl{ 893141240Snjl struct cpufreq_softc *sc; 894141240Snjl struct cf_level *levels; 895141240Snjl struct cf_setting *set; 896141240Snjl struct sbuf sb; 897141240Snjl int count, error, i; 898141240Snjl 899141240Snjl sc = oidp->oid_arg1; 900141240Snjl sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND); 901141240Snjl 902141240Snjl /* Get settings from the device and generate the output string. */ 903141240Snjl count = CF_MAX_LEVELS; 904141240Snjl levels = malloc(count * sizeof(*levels), M_TEMP, M_NOWAIT); 905141240Snjl if (levels == NULL) 906141240Snjl return (ENOMEM); 907141240Snjl error = CPUFREQ_LEVELS(sc->dev, levels, &count); 908142395Snjl if (error) { 909142395Snjl if (error == E2BIG) 910142395Snjl printf("cpufreq: need to increase CF_MAX_LEVELS\n"); 911141240Snjl goto out; 912142395Snjl } 913141240Snjl if (count) { 914141240Snjl for (i = 0; i < count; i++) { 915141240Snjl set = &levels[i].total_set; 916141240Snjl sbuf_printf(&sb, "%d/%d ", set->freq, set->power); 917141240Snjl } 918141240Snjl } else 919141240Snjl sbuf_cpy(&sb, "0"); 920141240Snjl sbuf_trim(&sb); 921141240Snjl sbuf_finish(&sb); 922141240Snjl error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req); 923141240Snjl 924141240Snjlout: 925141240Snjl free(levels, M_TEMP); 926141240Snjl sbuf_delete(&sb); 927141240Snjl return (error); 928141240Snjl} 929141240Snjl 930142114Snjlstatic int 931142114Snjlcpufreq_settings_sysctl(SYSCTL_HANDLER_ARGS) 932142114Snjl{ 933142114Snjl device_t dev; 934142114Snjl struct cf_setting *sets; 935142114Snjl struct sbuf sb; 936142114Snjl int error, i, set_count; 937142114Snjl 938142114Snjl dev = oidp->oid_arg1; 939142114Snjl sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND); 940142114Snjl 941142114Snjl /* Get settings from the device and generate the output string. */ 942142114Snjl set_count = MAX_SETTINGS; 943142114Snjl sets = malloc(set_count * sizeof(*sets), M_TEMP, M_NOWAIT); 944142114Snjl if (sets == NULL) 945142114Snjl return (ENOMEM); 946142114Snjl error = CPUFREQ_DRV_SETTINGS(dev, sets, &set_count); 947142114Snjl if (error) 948142114Snjl goto out; 949142114Snjl if (set_count) { 950142114Snjl for (i = 0; i < set_count; i++) 951142114Snjl sbuf_printf(&sb, "%d/%d ", sets[i].freq, sets[i].power); 952142114Snjl } else 953142114Snjl sbuf_cpy(&sb, "0"); 954142114Snjl sbuf_trim(&sb); 955142114Snjl sbuf_finish(&sb); 956142114Snjl error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req); 957142114Snjl 958142114Snjlout: 959142114Snjl free(sets, M_TEMP); 960142114Snjl sbuf_delete(&sb); 961142114Snjl return (error); 962142114Snjl} 963142114Snjl 964141240Snjlint 965141240Snjlcpufreq_register(device_t dev) 966141240Snjl{ 967141945Snjl struct cpufreq_softc *sc; 968141240Snjl device_t cf_dev, cpu_dev; 969141240Snjl 970142114Snjl /* Add a sysctl to get each driver's settings separately. */ 971142114Snjl SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev), 972142114Snjl SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), 973142114Snjl OID_AUTO, "freq_settings", CTLTYPE_STRING | CTLFLAG_RD, dev, 0, 974142114Snjl cpufreq_settings_sysctl, "A", "CPU frequency driver settings"); 975142114Snjl 976141240Snjl /* 977141814Snjl * Add only one cpufreq device to each CPU. Currently, all CPUs 978141814Snjl * must offer the same levels and be switched at the same time. 979141240Snjl */ 980141814Snjl cpu_dev = device_get_parent(dev); 981141945Snjl if ((cf_dev = device_find_child(cpu_dev, "cpufreq", -1))) { 982141945Snjl sc = device_get_softc(cf_dev); 983141945Snjl sc->max_mhz = CPUFREQ_VAL_UNKNOWN; 984141240Snjl return (0); 985141945Snjl } 986141240Snjl 987141814Snjl /* Add the child device and possibly sysctls. */ 988141814Snjl cf_dev = BUS_ADD_CHILD(cpu_dev, 0, "cpufreq", -1); 989141240Snjl if (cf_dev == NULL) 990141240Snjl return (ENOMEM); 991141240Snjl device_quiet(cf_dev); 992141240Snjl 993141240Snjl return (device_probe_and_attach(cf_dev)); 994141240Snjl} 995141240Snjl 996141240Snjlint 997141240Snjlcpufreq_unregister(device_t dev) 998141240Snjl{ 999141240Snjl device_t cf_dev, *devs; 1000142032Snjl int cfcount, devcount, error, i, type; 1001141240Snjl 1002141240Snjl /* 1003141240Snjl * If this is the last cpufreq child device, remove the control 1004141240Snjl * device as well. We identify cpufreq children by calling a method 1005141240Snjl * they support. 1006141240Snjl */ 1007141240Snjl error = device_get_children(device_get_parent(dev), &devs, &devcount); 1008141240Snjl if (error) 1009141240Snjl return (error); 1010141945Snjl cf_dev = device_find_child(device_get_parent(dev), "cpufreq", -1); 1011144413Snjl if (cf_dev == NULL) { 1012144413Snjl device_printf(dev, 1013144413Snjl "warning: cpufreq_unregister called with no cpufreq device active\n"); 1014144413Snjl return (0); 1015144413Snjl } 1016141240Snjl cfcount = 0; 1017141240Snjl for (i = 0; i < devcount; i++) { 1018141240Snjl if (!device_is_attached(devs[i])) 1019141240Snjl continue; 1020142032Snjl if (CPUFREQ_DRV_TYPE(devs[i], &type) == 0) 1021141240Snjl cfcount++; 1022141240Snjl } 1023141814Snjl if (cfcount <= 1) 1024141240Snjl device_delete_child(device_get_parent(cf_dev), cf_dev); 1025141240Snjl free(devs, M_TEMP); 1026141240Snjl 1027141240Snjl return (0); 1028141240Snjl} 1029167905Snjl 1030167905Snjlint 1031167905Snjlcpufreq_settings_changed(device_t dev) 1032167905Snjl{ 1033167905Snjl 1034167905Snjl EVENTHANDLER_INVOKE(cpufreq_levels_changed, 1035167905Snjl device_get_unit(device_get_parent(dev))); 1036167905Snjl return (0); 1037167905Snjl} 1038