173347b07SNate Lawson /*- 273347b07SNate Lawson * Copyright (c) 2004-2005 Nate Lawson (SDG) 373347b07SNate Lawson * All rights reserved. 473347b07SNate Lawson * 573347b07SNate Lawson * Redistribution and use in source and binary forms, with or without 673347b07SNate Lawson * modification, are permitted provided that the following conditions 773347b07SNate Lawson * are met: 873347b07SNate Lawson * 1. Redistributions of source code must retain the above copyright 973347b07SNate Lawson * notice, this list of conditions and the following disclaimer. 1073347b07SNate Lawson * 2. Redistributions in binary form must reproduce the above copyright 1173347b07SNate Lawson * notice, this list of conditions and the following disclaimer in the 1273347b07SNate Lawson * documentation and/or other materials provided with the distribution. 1373347b07SNate Lawson * 1473347b07SNate Lawson * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1573347b07SNate Lawson * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1673347b07SNate Lawson * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1773347b07SNate Lawson * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1873347b07SNate Lawson * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1973347b07SNate Lawson * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2073347b07SNate Lawson * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2173347b07SNate Lawson * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2273347b07SNate Lawson * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2373347b07SNate Lawson * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2473347b07SNate Lawson * SUCH DAMAGE. 2573347b07SNate Lawson */ 2673347b07SNate Lawson 2773347b07SNate Lawson #include <sys/cdefs.h> 2873347b07SNate Lawson __FBSDID("$FreeBSD$"); 2973347b07SNate Lawson 3073347b07SNate Lawson #include <sys/param.h> 3173347b07SNate Lawson #include <sys/bus.h> 3273347b07SNate Lawson #include <sys/cpu.h> 3373347b07SNate Lawson #include <sys/eventhandler.h> 3473347b07SNate Lawson #include <sys/kernel.h> 35789f03ceSNate Lawson #include <sys/lock.h> 3673347b07SNate Lawson #include <sys/malloc.h> 3773347b07SNate Lawson #include <sys/module.h> 3873347b07SNate Lawson #include <sys/proc.h> 3973347b07SNate Lawson #include <sys/queue.h> 4073347b07SNate Lawson #include <sys/sched.h> 4173347b07SNate Lawson #include <sys/sysctl.h> 4273347b07SNate Lawson #include <sys/systm.h> 4373347b07SNate Lawson #include <sys/sbuf.h> 44789f03ceSNate Lawson #include <sys/sx.h> 450325089dSNate Lawson #include <sys/timetc.h> 4673347b07SNate Lawson 4773347b07SNate Lawson #include "cpufreq_if.h" 4873347b07SNate Lawson 4973347b07SNate Lawson /* 5073347b07SNate Lawson * Common CPU frequency glue code. Drivers for specific hardware can 5173347b07SNate Lawson * attach this interface to allow users to get/set the CPU frequency. 5273347b07SNate Lawson */ 5373347b07SNate Lawson 5473347b07SNate Lawson /* 5573347b07SNate Lawson * Number of levels we can handle. Levels are synthesized from settings 56d269386aSNate Lawson * so for M settings and N drivers, there may be M*N levels. 5773347b07SNate Lawson */ 58d269386aSNate Lawson #define CF_MAX_LEVELS 64 5973347b07SNate Lawson 6056e5a87aSHajimu UMEMOTO struct cf_saved_freq { 6156e5a87aSHajimu UMEMOTO struct cf_level level; 6256e5a87aSHajimu UMEMOTO int priority; 6356e5a87aSHajimu UMEMOTO SLIST_ENTRY(cf_saved_freq) link; 6456e5a87aSHajimu UMEMOTO }; 6556e5a87aSHajimu UMEMOTO 6673347b07SNate Lawson struct cpufreq_softc { 67789f03ceSNate Lawson struct sx lock; 6873347b07SNate Lawson struct cf_level curr_level; 695f0afa04SNate Lawson int curr_priority; 7056e5a87aSHajimu UMEMOTO SLIST_HEAD(, cf_saved_freq) saved_freq; 7173347b07SNate Lawson struct cf_level_lst all_levels; 725f0afa04SNate Lawson int all_count; 7367c8649fSNate Lawson int max_mhz; 7473347b07SNate Lawson device_t dev; 7573347b07SNate Lawson struct sysctl_ctx_list sysctl_ctx; 7673347b07SNate Lawson }; 7773347b07SNate Lawson 7873347b07SNate Lawson struct cf_setting_array { 7973347b07SNate Lawson struct cf_setting sets[MAX_SETTINGS]; 8073347b07SNate Lawson int count; 8173347b07SNate Lawson TAILQ_ENTRY(cf_setting_array) link; 8273347b07SNate Lawson }; 8373347b07SNate Lawson 8473347b07SNate Lawson TAILQ_HEAD(cf_setting_lst, cf_setting_array); 8573347b07SNate Lawson 86789f03ceSNate Lawson #define CF_MTX_INIT(x) sx_init((x), "cpufreq lock") 87789f03ceSNate Lawson #define CF_MTX_LOCK(x) sx_xlock((x)) 88789f03ceSNate Lawson #define CF_MTX_UNLOCK(x) sx_xunlock((x)) 89789f03ceSNate Lawson #define CF_MTX_ASSERT(x) sx_assert((x), SX_XLOCKED) 90789f03ceSNate Lawson 918d913481SNate Lawson #define CF_DEBUG(msg...) do { \ 928d913481SNate Lawson if (cf_verbose) \ 938d913481SNate Lawson printf("cpufreq: " msg); \ 948d913481SNate Lawson } while (0) 958d913481SNate Lawson 9673347b07SNate Lawson static int cpufreq_attach(device_t dev); 9773347b07SNate Lawson static int cpufreq_detach(device_t dev); 9873347b07SNate Lawson static void cpufreq_evaluate(void *arg); 9973347b07SNate Lawson static int cf_set_method(device_t dev, const struct cf_level *level, 10073347b07SNate Lawson int priority); 10173347b07SNate Lawson static int cf_get_method(device_t dev, struct cf_level *level); 10273347b07SNate Lawson static int cf_levels_method(device_t dev, struct cf_level *levels, 10373347b07SNate Lawson int *count); 10488c9b54cSNate Lawson static int cpufreq_insert_abs(struct cpufreq_softc *sc, 10573347b07SNate Lawson struct cf_setting *sets, int count); 10688c9b54cSNate Lawson static int cpufreq_expand_set(struct cpufreq_softc *sc, 10788c9b54cSNate Lawson struct cf_setting_array *set_arr); 10888c9b54cSNate Lawson static struct cf_level *cpufreq_dup_set(struct cpufreq_softc *sc, 10988c9b54cSNate Lawson struct cf_level *dup, struct cf_setting *set); 11073347b07SNate Lawson static int cpufreq_curr_sysctl(SYSCTL_HANDLER_ARGS); 11173347b07SNate Lawson static int cpufreq_levels_sysctl(SYSCTL_HANDLER_ARGS); 112e959a70bSNate Lawson static int cpufreq_settings_sysctl(SYSCTL_HANDLER_ARGS); 11373347b07SNate Lawson 11473347b07SNate Lawson static device_method_t cpufreq_methods[] = { 11573347b07SNate Lawson DEVMETHOD(device_probe, bus_generic_probe), 11673347b07SNate Lawson DEVMETHOD(device_attach, cpufreq_attach), 11773347b07SNate Lawson DEVMETHOD(device_detach, cpufreq_detach), 11873347b07SNate Lawson 11973347b07SNate Lawson DEVMETHOD(cpufreq_set, cf_set_method), 12073347b07SNate Lawson DEVMETHOD(cpufreq_get, cf_get_method), 12173347b07SNate Lawson DEVMETHOD(cpufreq_levels, cf_levels_method), 12273347b07SNate Lawson {0, 0} 12373347b07SNate Lawson }; 12473347b07SNate Lawson static driver_t cpufreq_driver = { 12573347b07SNate Lawson "cpufreq", cpufreq_methods, sizeof(struct cpufreq_softc) 12673347b07SNate Lawson }; 12773347b07SNate Lawson static devclass_t cpufreq_dc; 12873347b07SNate Lawson DRIVER_MODULE(cpufreq, cpu, cpufreq_driver, cpufreq_dc, 0, 0); 12973347b07SNate Lawson 13073347b07SNate Lawson static eventhandler_tag cf_ev_tag; 13173347b07SNate Lawson 132b070969bSNate Lawson static int cf_lowest_freq; 1338d913481SNate Lawson static int cf_verbose; 134b070969bSNate Lawson TUNABLE_INT("debug.cpufreq.lowest", &cf_lowest_freq); 1358d913481SNate Lawson TUNABLE_INT("debug.cpufreq.verbose", &cf_verbose); 136b070969bSNate Lawson SYSCTL_NODE(_debug, OID_AUTO, cpufreq, CTLFLAG_RD, NULL, "cpufreq debugging"); 137b070969bSNate Lawson SYSCTL_INT(_debug_cpufreq, OID_AUTO, lowest, CTLFLAG_RW, &cf_lowest_freq, 1, 138b070969bSNate Lawson "Don't provide levels below this frequency."); 1398d913481SNate Lawson SYSCTL_INT(_debug_cpufreq, OID_AUTO, verbose, CTLFLAG_RW, &cf_verbose, 1, 1408d913481SNate Lawson "Print verbose debugging messages"); 141b070969bSNate Lawson 14273347b07SNate Lawson static int 14373347b07SNate Lawson cpufreq_attach(device_t dev) 14473347b07SNate Lawson { 14573347b07SNate Lawson struct cpufreq_softc *sc; 14673347b07SNate Lawson device_t parent; 14773347b07SNate Lawson int numdevs; 14873347b07SNate Lawson 1498d913481SNate Lawson CF_DEBUG("initializing %s\n", device_get_nameunit(dev)); 15073347b07SNate Lawson sc = device_get_softc(dev); 15173347b07SNate Lawson parent = device_get_parent(dev); 15273347b07SNate Lawson sc->dev = dev; 15373347b07SNate Lawson sysctl_ctx_init(&sc->sysctl_ctx); 15473347b07SNate Lawson TAILQ_INIT(&sc->all_levels); 155789f03ceSNate Lawson CF_MTX_INIT(&sc->lock); 15673347b07SNate Lawson sc->curr_level.total_set.freq = CPUFREQ_VAL_UNKNOWN; 15756e5a87aSHajimu UMEMOTO SLIST_INIT(&sc->saved_freq); 15867c8649fSNate Lawson sc->max_mhz = CPUFREQ_VAL_UNKNOWN; 15973347b07SNate Lawson 16073347b07SNate Lawson /* 16173347b07SNate Lawson * Only initialize one set of sysctls for all CPUs. In the future, 16273347b07SNate Lawson * if multiple CPUs can have different settings, we can move these 16373347b07SNate Lawson * sysctls to be under every CPU instead of just the first one. 16473347b07SNate Lawson */ 16573347b07SNate Lawson numdevs = devclass_get_count(cpufreq_dc); 16673347b07SNate Lawson if (numdevs > 1) 16773347b07SNate Lawson return (0); 16873347b07SNate Lawson 1698d913481SNate Lawson CF_DEBUG("initializing one-time data for %s\n", 1708d913481SNate Lawson device_get_nameunit(dev)); 17173347b07SNate Lawson SYSCTL_ADD_PROC(&sc->sysctl_ctx, 17273347b07SNate Lawson SYSCTL_CHILDREN(device_get_sysctl_tree(parent)), 17373347b07SNate Lawson OID_AUTO, "freq", CTLTYPE_INT | CTLFLAG_RW, sc, 0, 17473347b07SNate Lawson cpufreq_curr_sysctl, "I", "Current CPU frequency"); 17573347b07SNate Lawson SYSCTL_ADD_PROC(&sc->sysctl_ctx, 17673347b07SNate Lawson SYSCTL_CHILDREN(device_get_sysctl_tree(parent)), 17773347b07SNate Lawson OID_AUTO, "freq_levels", CTLTYPE_STRING | CTLFLAG_RD, sc, 0, 17873347b07SNate Lawson cpufreq_levels_sysctl, "A", "CPU frequency levels"); 17973347b07SNate Lawson cf_ev_tag = EVENTHANDLER_REGISTER(cpufreq_changed, cpufreq_evaluate, 18073347b07SNate Lawson NULL, EVENTHANDLER_PRI_ANY); 18173347b07SNate Lawson 18273347b07SNate Lawson return (0); 18373347b07SNate Lawson } 18473347b07SNate Lawson 18573347b07SNate Lawson static int 18673347b07SNate Lawson cpufreq_detach(device_t dev) 18773347b07SNate Lawson { 18873347b07SNate Lawson struct cpufreq_softc *sc; 18956e5a87aSHajimu UMEMOTO struct cf_saved_freq *saved_freq; 19073347b07SNate Lawson int numdevs; 19173347b07SNate Lawson 1928d913481SNate Lawson CF_DEBUG("shutdown %s\n", device_get_nameunit(dev)); 19373347b07SNate Lawson sc = device_get_softc(dev); 19473347b07SNate Lawson sysctl_ctx_free(&sc->sysctl_ctx); 19573347b07SNate Lawson 19656e5a87aSHajimu UMEMOTO while ((saved_freq = SLIST_FIRST(&sc->saved_freq)) != NULL) { 19756e5a87aSHajimu UMEMOTO SLIST_REMOVE_HEAD(&sc->saved_freq, link); 19856e5a87aSHajimu UMEMOTO free(saved_freq, M_TEMP); 19956e5a87aSHajimu UMEMOTO } 20056e5a87aSHajimu UMEMOTO 20173347b07SNate Lawson /* Only clean up these resources when the last device is detaching. */ 20273347b07SNate Lawson numdevs = devclass_get_count(cpufreq_dc); 2038d913481SNate Lawson if (numdevs == 1) { 2048d913481SNate Lawson CF_DEBUG("final shutdown for %s\n", device_get_nameunit(dev)); 20573347b07SNate Lawson EVENTHANDLER_DEREGISTER(cpufreq_changed, cf_ev_tag); 2068d913481SNate Lawson } 20773347b07SNate Lawson 20873347b07SNate Lawson return (0); 20973347b07SNate Lawson } 21073347b07SNate Lawson 21173347b07SNate Lawson static void 21273347b07SNate Lawson cpufreq_evaluate(void *arg) 21373347b07SNate Lawson { 21473347b07SNate Lawson /* TODO: Re-evaluate when notified of changes to drivers. */ 21573347b07SNate Lawson } 21673347b07SNate Lawson 21773347b07SNate Lawson static int 21873347b07SNate Lawson cf_set_method(device_t dev, const struct cf_level *level, int priority) 21973347b07SNate Lawson { 22073347b07SNate Lawson struct cpufreq_softc *sc; 22173347b07SNate Lawson const struct cf_setting *set; 22256e5a87aSHajimu UMEMOTO struct cf_saved_freq *saved_freq, *curr_freq; 2230325089dSNate Lawson struct pcpu *pc; 2240325089dSNate Lawson int cpu_id, error, i; 225b4130b8aSMarcus Alves Grando static int once; 22673347b07SNate Lawson 22773347b07SNate Lawson sc = device_get_softc(dev); 228789f03ceSNate Lawson error = 0; 229789f03ceSNate Lawson set = NULL; 23056e5a87aSHajimu UMEMOTO saved_freq = NULL; 23173347b07SNate Lawson 2320325089dSNate Lawson /* 2330325089dSNate Lawson * Check that the TSC isn't being used as a timecounter. 2340325089dSNate Lawson * If it is, then return EBUSY and refuse to change the 2350325089dSNate Lawson * clock speed. 2360325089dSNate Lawson */ 237b4130b8aSMarcus Alves Grando if (strcmp(timecounter->tc_name, "TSC") == 0) { 238b4130b8aSMarcus Alves Grando if (!once) { 239b4130b8aSMarcus Alves Grando printf("cpufreq: frequency change with timecounter" 240b4130b8aSMarcus Alves Grando " TSC not allowed, see cpufreq(4)\n"); 241b4130b8aSMarcus Alves Grando once = 1; 242b4130b8aSMarcus Alves Grando } 2430325089dSNate Lawson return (EBUSY); 244b4130b8aSMarcus Alves Grando } 2450325089dSNate Lawson 246789f03ceSNate Lawson CF_MTX_LOCK(&sc->lock); 24756e5a87aSHajimu UMEMOTO 24856e5a87aSHajimu UMEMOTO /* 24956e5a87aSHajimu UMEMOTO * If the requested level has a lower priority, don't allow 25056e5a87aSHajimu UMEMOTO * the new level right now. 25156e5a87aSHajimu UMEMOTO */ 25256e5a87aSHajimu UMEMOTO if (priority < sc->curr_priority) { 2538d913481SNate Lawson CF_DEBUG("ignoring, curr prio %d less than %d\n", priority, 2548d913481SNate Lawson sc->curr_priority); 255789f03ceSNate Lawson error = EPERM; 256789f03ceSNate Lawson goto out; 257789f03ceSNate Lawson } 2585f0afa04SNate Lawson 25956e5a87aSHajimu UMEMOTO /* 26056e5a87aSHajimu UMEMOTO * If the caller didn't specify a level and one is saved, prepare to 26156e5a87aSHajimu UMEMOTO * restore the saved level. If none has been saved, return an error. 26256e5a87aSHajimu UMEMOTO */ 26356e5a87aSHajimu UMEMOTO if (level == NULL) { 26456e5a87aSHajimu UMEMOTO saved_freq = SLIST_FIRST(&sc->saved_freq); 26556e5a87aSHajimu UMEMOTO if (saved_freq == NULL) { 26656e5a87aSHajimu UMEMOTO CF_DEBUG("NULL level, no saved level\n"); 26756e5a87aSHajimu UMEMOTO error = ENXIO; 26856e5a87aSHajimu UMEMOTO goto out; 26956e5a87aSHajimu UMEMOTO } 27056e5a87aSHajimu UMEMOTO level = &saved_freq->level; 27156e5a87aSHajimu UMEMOTO priority = saved_freq->priority; 27256e5a87aSHajimu UMEMOTO CF_DEBUG("restoring saved level, freq %d prio %d\n", 27356e5a87aSHajimu UMEMOTO level->total_set.freq, priority); 27456e5a87aSHajimu UMEMOTO } 27556e5a87aSHajimu UMEMOTO 276b070969bSNate Lawson /* Reject levels that are below our specified threshold. */ 277da8a77c1SNate Lawson if (level->total_set.freq < cf_lowest_freq) { 2788d913481SNate Lawson CF_DEBUG("rejecting freq %d, less than %d limit\n", 2798d913481SNate Lawson level->total_set.freq, cf_lowest_freq); 280789f03ceSNate Lawson error = EINVAL; 281789f03ceSNate Lawson goto out; 282789f03ceSNate Lawson } 283b070969bSNate Lawson 28473347b07SNate Lawson /* If already at this level, just return. */ 2858d913481SNate Lawson if (CPUFREQ_CMP(sc->curr_level.total_set.freq, level->total_set.freq)) { 2868d913481SNate Lawson CF_DEBUG("skipping freq %d, same as current level %d\n", 2878d913481SNate Lawson level->total_set.freq, sc->curr_level.total_set.freq); 2881fea6ce7SHajimu UMEMOTO goto skip; 2898d913481SNate Lawson } 29073347b07SNate Lawson 29173347b07SNate Lawson /* First, set the absolute frequency via its driver. */ 29273347b07SNate Lawson set = &level->abs_set; 29373347b07SNate Lawson if (set->dev) { 29473347b07SNate Lawson if (!device_is_attached(set->dev)) { 29573347b07SNate Lawson error = ENXIO; 29673347b07SNate Lawson goto out; 29773347b07SNate Lawson } 2981196826aSNate Lawson 2991196826aSNate Lawson /* Bind to the target CPU before switching, if necessary. */ 3001196826aSNate Lawson cpu_id = PCPU_GET(cpuid); 3011196826aSNate Lawson pc = cpu_get_pcpu(set->dev); 3021196826aSNate Lawson if (cpu_id != pc->pc_cpuid) { 3031196826aSNate Lawson mtx_lock_spin(&sched_lock); 3041196826aSNate Lawson sched_bind(curthread, pc->pc_cpuid); 3051196826aSNate Lawson mtx_unlock_spin(&sched_lock); 3061196826aSNate Lawson } 3078d913481SNate Lawson CF_DEBUG("setting abs freq %d on %s (cpu %d)\n", set->freq, 3088d913481SNate Lawson device_get_nameunit(set->dev), PCPU_GET(cpuid)); 30973347b07SNate Lawson error = CPUFREQ_DRV_SET(set->dev, set); 3101196826aSNate Lawson if (cpu_id != pc->pc_cpuid) { 3111196826aSNate Lawson mtx_lock_spin(&sched_lock); 3121196826aSNate Lawson sched_unbind(curthread); 3131196826aSNate Lawson mtx_unlock_spin(&sched_lock); 3141196826aSNate Lawson } 31573347b07SNate Lawson if (error) { 31673347b07SNate Lawson goto out; 31773347b07SNate Lawson } 31873347b07SNate Lawson } 31973347b07SNate Lawson 32088c9b54cSNate Lawson /* Next, set any/all relative frequencies via their drivers. */ 32188c9b54cSNate Lawson for (i = 0; i < level->rel_count; i++) { 32288c9b54cSNate Lawson set = &level->rel_set[i]; 32388c9b54cSNate Lawson if (!device_is_attached(set->dev)) { 32488c9b54cSNate Lawson error = ENXIO; 32588c9b54cSNate Lawson goto out; 32688c9b54cSNate Lawson } 3271196826aSNate Lawson 3281196826aSNate Lawson /* Bind to the target CPU before switching, if necessary. */ 3291196826aSNate Lawson cpu_id = PCPU_GET(cpuid); 3301196826aSNate Lawson pc = cpu_get_pcpu(set->dev); 3311196826aSNate Lawson if (cpu_id != pc->pc_cpuid) { 3321196826aSNate Lawson mtx_lock_spin(&sched_lock); 3331196826aSNate Lawson sched_bind(curthread, pc->pc_cpuid); 3341196826aSNate Lawson mtx_unlock_spin(&sched_lock); 3351196826aSNate Lawson } 3368d913481SNate Lawson CF_DEBUG("setting rel freq %d on %s (cpu %d)\n", set->freq, 3378d913481SNate Lawson device_get_nameunit(set->dev), PCPU_GET(cpuid)); 33888c9b54cSNate Lawson error = CPUFREQ_DRV_SET(set->dev, set); 3391196826aSNate Lawson if (cpu_id != pc->pc_cpuid) { 3401196826aSNate Lawson mtx_lock_spin(&sched_lock); 3411196826aSNate Lawson sched_unbind(curthread); 3421196826aSNate Lawson mtx_unlock_spin(&sched_lock); 3431196826aSNate Lawson } 34488c9b54cSNate Lawson if (error) { 34588c9b54cSNate Lawson /* XXX Back out any successful setting? */ 34688c9b54cSNate Lawson goto out; 34788c9b54cSNate Lawson } 34888c9b54cSNate Lawson } 34973347b07SNate Lawson 3501fea6ce7SHajimu UMEMOTO skip: 3515f0afa04SNate Lawson /* 3525f0afa04SNate Lawson * Before recording the current level, check if we're going to a 35356e5a87aSHajimu UMEMOTO * higher priority. If so, save the previous level and priority. 3545f0afa04SNate Lawson */ 3555f0afa04SNate Lawson if (sc->curr_level.total_set.freq != CPUFREQ_VAL_UNKNOWN && 35656e5a87aSHajimu UMEMOTO priority > sc->curr_priority) { 3578d913481SNate Lawson CF_DEBUG("saving level, freq %d prio %d\n", 3588d913481SNate Lawson sc->curr_level.total_set.freq, sc->curr_priority); 35956e5a87aSHajimu UMEMOTO curr_freq = malloc(sizeof(*curr_freq), M_TEMP, M_NOWAIT); 36056e5a87aSHajimu UMEMOTO if (curr_freq == NULL) { 36156e5a87aSHajimu UMEMOTO error = ENOMEM; 36256e5a87aSHajimu UMEMOTO goto out; 36356e5a87aSHajimu UMEMOTO } 36456e5a87aSHajimu UMEMOTO curr_freq->level = sc->curr_level; 36556e5a87aSHajimu UMEMOTO curr_freq->priority = sc->curr_priority; 36656e5a87aSHajimu UMEMOTO SLIST_INSERT_HEAD(&sc->saved_freq, curr_freq, link); 3675f0afa04SNate Lawson } 36873347b07SNate Lawson sc->curr_level = *level; 3695f0afa04SNate Lawson sc->curr_priority = priority; 37073347b07SNate Lawson 37156e5a87aSHajimu UMEMOTO /* If we were restoring a saved state, reset it to "unused". */ 37256e5a87aSHajimu UMEMOTO if (saved_freq != NULL) { 37356e5a87aSHajimu UMEMOTO CF_DEBUG("resetting saved level\n"); 37456e5a87aSHajimu UMEMOTO sc->curr_level.total_set.freq = CPUFREQ_VAL_UNKNOWN; 37556e5a87aSHajimu UMEMOTO SLIST_REMOVE_HEAD(&sc->saved_freq, link); 37656e5a87aSHajimu UMEMOTO free(saved_freq, M_TEMP); 37756e5a87aSHajimu UMEMOTO } 37856e5a87aSHajimu UMEMOTO 37973347b07SNate Lawson out: 380789f03ceSNate Lawson CF_MTX_UNLOCK(&sc->lock); 381789f03ceSNate Lawson if (error && set) 38273347b07SNate Lawson device_printf(set->dev, "set freq failed, err %d\n", error); 38373347b07SNate Lawson return (error); 38473347b07SNate Lawson } 38573347b07SNate Lawson 38673347b07SNate Lawson static int 38773347b07SNate Lawson cf_get_method(device_t dev, struct cf_level *level) 38873347b07SNate Lawson { 38973347b07SNate Lawson struct cpufreq_softc *sc; 39073347b07SNate Lawson struct cf_level *levels; 39173347b07SNate Lawson struct cf_setting *curr_set, set; 39273347b07SNate Lawson struct pcpu *pc; 39373347b07SNate Lawson device_t *devs; 39473347b07SNate Lawson int count, error, i, numdevs; 39573347b07SNate Lawson uint64_t rate; 39673347b07SNate Lawson 39773347b07SNate Lawson sc = device_get_softc(dev); 398789f03ceSNate Lawson error = 0; 39973347b07SNate Lawson levels = NULL; 40073347b07SNate Lawson 40173347b07SNate Lawson /* If we already know the current frequency, we're done. */ 402789f03ceSNate Lawson CF_MTX_LOCK(&sc->lock); 403789f03ceSNate Lawson curr_set = &sc->curr_level.total_set; 4048d913481SNate Lawson if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) { 4058d913481SNate Lawson CF_DEBUG("get returning known freq %d\n", curr_set->freq); 40673347b07SNate Lawson goto out; 4078d913481SNate Lawson } 408789f03ceSNate Lawson CF_MTX_UNLOCK(&sc->lock); 40973347b07SNate Lawson 41073347b07SNate Lawson /* 41173347b07SNate Lawson * We need to figure out the current level. Loop through every 41273347b07SNate Lawson * driver, getting the current setting. Then, attempt to get a best 41373347b07SNate Lawson * match of settings against each level. 41473347b07SNate Lawson */ 41573347b07SNate Lawson count = CF_MAX_LEVELS; 41673347b07SNate Lawson levels = malloc(count * sizeof(*levels), M_TEMP, M_NOWAIT); 41773347b07SNate Lawson if (levels == NULL) 41873347b07SNate Lawson return (ENOMEM); 41973347b07SNate Lawson error = CPUFREQ_LEVELS(sc->dev, levels, &count); 420d269386aSNate Lawson if (error) { 421d269386aSNate Lawson if (error == E2BIG) 422d269386aSNate Lawson printf("cpufreq: need to increase CF_MAX_LEVELS\n"); 423789f03ceSNate Lawson free(levels, M_TEMP); 424789f03ceSNate Lawson return (error); 425d269386aSNate Lawson } 42673347b07SNate Lawson error = device_get_children(device_get_parent(dev), &devs, &numdevs); 427789f03ceSNate Lawson if (error) { 428789f03ceSNate Lawson free(levels, M_TEMP); 429789f03ceSNate Lawson return (error); 430789f03ceSNate Lawson } 431789f03ceSNate Lawson 432789f03ceSNate Lawson /* 433789f03ceSNate Lawson * Reacquire the lock and search for the given level. 434789f03ceSNate Lawson * 435789f03ceSNate Lawson * XXX Note: this is not quite right since we really need to go 436789f03ceSNate Lawson * through each level and compare both absolute and relative 437789f03ceSNate Lawson * settings for each driver in the system before making a match. 438789f03ceSNate Lawson * The estimation code below catches this case though. 439789f03ceSNate Lawson */ 440789f03ceSNate Lawson CF_MTX_LOCK(&sc->lock); 44173347b07SNate Lawson for (i = 0; i < numdevs && curr_set->freq == CPUFREQ_VAL_UNKNOWN; i++) { 44273347b07SNate Lawson if (!device_is_attached(devs[i])) 44373347b07SNate Lawson continue; 44473347b07SNate Lawson error = CPUFREQ_DRV_GET(devs[i], &set); 44573347b07SNate Lawson if (error) 44673347b07SNate Lawson continue; 44773347b07SNate Lawson for (i = 0; i < count; i++) { 44888c9b54cSNate Lawson if (CPUFREQ_CMP(set.freq, levels[i].total_set.freq)) { 44973347b07SNate Lawson sc->curr_level = levels[i]; 45073347b07SNate Lawson break; 45173347b07SNate Lawson } 45273347b07SNate Lawson } 45373347b07SNate Lawson } 45473347b07SNate Lawson free(devs, M_TEMP); 4558d913481SNate Lawson if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) { 4568d913481SNate Lawson CF_DEBUG("get matched freq %d from drivers\n", curr_set->freq); 45773347b07SNate Lawson goto out; 4588d913481SNate Lawson } 45973347b07SNate Lawson 46073347b07SNate Lawson /* 46173347b07SNate Lawson * We couldn't find an exact match, so attempt to estimate and then 46273347b07SNate Lawson * match against a level. 46373347b07SNate Lawson */ 46473347b07SNate Lawson pc = cpu_get_pcpu(dev); 46573347b07SNate Lawson if (pc == NULL) { 46673347b07SNate Lawson error = ENXIO; 46773347b07SNate Lawson goto out; 46873347b07SNate Lawson } 46973347b07SNate Lawson cpu_est_clockrate(pc->pc_cpuid, &rate); 47073347b07SNate Lawson rate /= 1000000; 47173347b07SNate Lawson for (i = 0; i < count; i++) { 47273347b07SNate Lawson if (CPUFREQ_CMP(rate, levels[i].total_set.freq)) { 47373347b07SNate Lawson sc->curr_level = levels[i]; 4748d913481SNate Lawson CF_DEBUG("get estimated freq %d\n", curr_set->freq); 47573347b07SNate Lawson break; 47673347b07SNate Lawson } 47773347b07SNate Lawson } 47873347b07SNate Lawson 47973347b07SNate Lawson out: 480789f03ceSNate Lawson if (error == 0) 481789f03ceSNate Lawson *level = sc->curr_level; 482789f03ceSNate Lawson 483789f03ceSNate Lawson CF_MTX_UNLOCK(&sc->lock); 48473347b07SNate Lawson if (levels) 48573347b07SNate Lawson free(levels, M_TEMP); 486789f03ceSNate Lawson return (error); 48773347b07SNate Lawson } 48873347b07SNate Lawson 48973347b07SNate Lawson static int 49073347b07SNate Lawson cf_levels_method(device_t dev, struct cf_level *levels, int *count) 49173347b07SNate Lawson { 49288c9b54cSNate Lawson struct cf_setting_array *set_arr; 49373347b07SNate Lawson struct cf_setting_lst rel_sets; 49473347b07SNate Lawson struct cpufreq_softc *sc; 49573347b07SNate Lawson struct cf_level *lev; 49673347b07SNate Lawson struct cf_setting *sets; 49773347b07SNate Lawson struct pcpu *pc; 49873347b07SNate Lawson device_t *devs; 49988c9b54cSNate Lawson int error, i, numdevs, set_count, type; 50073347b07SNate Lawson uint64_t rate; 50173347b07SNate Lawson 50273347b07SNate Lawson if (levels == NULL || count == NULL) 50373347b07SNate Lawson return (EINVAL); 50473347b07SNate Lawson 50573347b07SNate Lawson TAILQ_INIT(&rel_sets); 50673347b07SNate Lawson sc = device_get_softc(dev); 50773347b07SNate Lawson error = device_get_children(device_get_parent(dev), &devs, &numdevs); 50873347b07SNate Lawson if (error) 50973347b07SNate Lawson return (error); 51073347b07SNate Lawson sets = malloc(MAX_SETTINGS * sizeof(*sets), M_TEMP, M_NOWAIT); 51173347b07SNate Lawson if (sets == NULL) { 51273347b07SNate Lawson free(devs, M_TEMP); 51373347b07SNate Lawson return (ENOMEM); 51473347b07SNate Lawson } 51573347b07SNate Lawson 51673347b07SNate Lawson /* Get settings from all cpufreq drivers. */ 517789f03ceSNate Lawson CF_MTX_LOCK(&sc->lock); 51873347b07SNate Lawson for (i = 0; i < numdevs; i++) { 519e22cd41cSNate Lawson /* Skip devices that aren't ready. */ 52073347b07SNate Lawson if (!device_is_attached(devs[i])) 52173347b07SNate Lawson continue; 522e22cd41cSNate Lawson 523e22cd41cSNate Lawson /* 524e22cd41cSNate Lawson * Get settings, skipping drivers that offer no settings or 525e22cd41cSNate Lawson * provide settings for informational purposes only. 526e22cd41cSNate Lawson */ 527e94a0c1aSNate Lawson error = CPUFREQ_DRV_TYPE(devs[i], &type); 5288d913481SNate Lawson if (error || (type & CPUFREQ_FLAG_INFO_ONLY)) { 5298d913481SNate Lawson if (error == 0) { 5308d913481SNate Lawson CF_DEBUG("skipping info-only driver %s\n", 5318d913481SNate Lawson device_get_nameunit(devs[i])); 5328d913481SNate Lawson } 533e94a0c1aSNate Lawson continue; 5348d913481SNate Lawson } 53573347b07SNate Lawson set_count = MAX_SETTINGS; 536e94a0c1aSNate Lawson error = CPUFREQ_DRV_SETTINGS(devs[i], sets, &set_count); 537e94a0c1aSNate Lawson if (error || set_count == 0) 53873347b07SNate Lawson continue; 53973347b07SNate Lawson 540e22cd41cSNate Lawson /* Add the settings to our absolute/relative lists. */ 5410325089dSNate Lawson switch (type & CPUFREQ_TYPE_MASK) { 54288c9b54cSNate Lawson case CPUFREQ_TYPE_ABSOLUTE: 54388c9b54cSNate Lawson error = cpufreq_insert_abs(sc, sets, set_count); 54488c9b54cSNate Lawson break; 54588c9b54cSNate Lawson case CPUFREQ_TYPE_RELATIVE: 5468d913481SNate Lawson CF_DEBUG("adding %d relative settings\n", set_count); 54788c9b54cSNate Lawson set_arr = malloc(sizeof(*set_arr), M_TEMP, M_NOWAIT); 54888c9b54cSNate Lawson if (set_arr == NULL) { 54988c9b54cSNate Lawson error = ENOMEM; 55088c9b54cSNate Lawson goto out; 55188c9b54cSNate Lawson } 55288c9b54cSNate Lawson bcopy(sets, set_arr->sets, set_count * sizeof(*sets)); 55388c9b54cSNate Lawson set_arr->count = set_count; 55488c9b54cSNate Lawson TAILQ_INSERT_TAIL(&rel_sets, set_arr, link); 55588c9b54cSNate Lawson break; 55688c9b54cSNate Lawson default: 55788c9b54cSNate Lawson error = EINVAL; 55888c9b54cSNate Lawson } 55988c9b54cSNate Lawson if (error) 56073347b07SNate Lawson goto out; 56173347b07SNate Lawson } 56273347b07SNate Lawson 56367c8649fSNate Lawson /* 56467c8649fSNate Lawson * If there are no absolute levels, create a fake one at 100%. We 56567c8649fSNate Lawson * then cache the clockrate for later use as our base frequency. 56667c8649fSNate Lawson * 56767c8649fSNate Lawson * XXX This assumes that the first time through, if we only have 56867c8649fSNate Lawson * relative drivers, the CPU is currently running at 100%. 56967c8649fSNate Lawson */ 57073347b07SNate Lawson if (TAILQ_EMPTY(&sc->all_levels)) { 57167c8649fSNate Lawson if (sc->max_mhz == CPUFREQ_VAL_UNKNOWN) { 57273347b07SNate Lawson pc = cpu_get_pcpu(dev); 57373347b07SNate Lawson cpu_est_clockrate(pc->pc_cpuid, &rate); 57467c8649fSNate Lawson sc->max_mhz = rate / 1000000; 57567c8649fSNate Lawson } 57667c8649fSNate Lawson memset(&sets[0], CPUFREQ_VAL_UNKNOWN, sizeof(*sets)); 57767c8649fSNate Lawson sets[0].freq = sc->max_mhz; 57867c8649fSNate Lawson sets[0].dev = NULL; 57988c9b54cSNate Lawson error = cpufreq_insert_abs(sc, sets, 1); 58073347b07SNate Lawson if (error) 58173347b07SNate Lawson goto out; 58273347b07SNate Lawson } 58373347b07SNate Lawson 58488c9b54cSNate Lawson /* Create a combined list of absolute + relative levels. */ 58588c9b54cSNate Lawson TAILQ_FOREACH(set_arr, &rel_sets, link) 58688c9b54cSNate Lawson cpufreq_expand_set(sc, set_arr); 58788c9b54cSNate Lawson 58888c9b54cSNate Lawson /* If the caller doesn't have enough space, return the actual count. */ 58988c9b54cSNate Lawson if (sc->all_count > *count) { 59088c9b54cSNate Lawson *count = sc->all_count; 59188c9b54cSNate Lawson error = E2BIG; 59288c9b54cSNate Lawson goto out; 59388c9b54cSNate Lawson } 59488c9b54cSNate Lawson 59588c9b54cSNate Lawson /* Finally, output the list of levels. */ 59673347b07SNate Lawson i = 0; 59773347b07SNate Lawson TAILQ_FOREACH(lev, &sc->all_levels, link) { 598b070969bSNate Lawson /* Skip levels that have a frequency that is too low. */ 599da8a77c1SNate Lawson if (lev->total_set.freq < cf_lowest_freq) { 600b070969bSNate Lawson sc->all_count--; 601b070969bSNate Lawson continue; 602b070969bSNate Lawson } 603b070969bSNate Lawson 60473347b07SNate Lawson levels[i] = *lev; 60573347b07SNate Lawson i++; 60673347b07SNate Lawson } 60788c9b54cSNate Lawson *count = sc->all_count; 60873347b07SNate Lawson error = 0; 60973347b07SNate Lawson 61073347b07SNate Lawson out: 61173347b07SNate Lawson /* Clear all levels since we regenerate them each time. */ 61273347b07SNate Lawson while ((lev = TAILQ_FIRST(&sc->all_levels)) != NULL) { 61373347b07SNate Lawson TAILQ_REMOVE(&sc->all_levels, lev, link); 61473347b07SNate Lawson free(lev, M_TEMP); 61573347b07SNate Lawson } 616789f03ceSNate Lawson sc->all_count = 0; 617789f03ceSNate Lawson 618789f03ceSNate Lawson CF_MTX_UNLOCK(&sc->lock); 61988c9b54cSNate Lawson while ((set_arr = TAILQ_FIRST(&rel_sets)) != NULL) { 62088c9b54cSNate Lawson TAILQ_REMOVE(&rel_sets, set_arr, link); 62188c9b54cSNate Lawson free(set_arr, M_TEMP); 62288c9b54cSNate Lawson } 62373347b07SNate Lawson free(devs, M_TEMP); 62473347b07SNate Lawson free(sets, M_TEMP); 62573347b07SNate Lawson return (error); 62673347b07SNate Lawson } 62773347b07SNate Lawson 62873347b07SNate Lawson /* 62973347b07SNate Lawson * Create levels for an array of absolute settings and insert them in 63073347b07SNate Lawson * sorted order in the specified list. 63173347b07SNate Lawson */ 63273347b07SNate Lawson static int 63388c9b54cSNate Lawson cpufreq_insert_abs(struct cpufreq_softc *sc, struct cf_setting *sets, 63473347b07SNate Lawson int count) 63573347b07SNate Lawson { 63688c9b54cSNate Lawson struct cf_level_lst *list; 63773347b07SNate Lawson struct cf_level *level, *search; 63873347b07SNate Lawson int i; 63973347b07SNate Lawson 640789f03ceSNate Lawson CF_MTX_ASSERT(&sc->lock); 641789f03ceSNate Lawson 64288c9b54cSNate Lawson list = &sc->all_levels; 64373347b07SNate Lawson for (i = 0; i < count; i++) { 64473347b07SNate Lawson level = malloc(sizeof(*level), M_TEMP, M_NOWAIT | M_ZERO); 64573347b07SNate Lawson if (level == NULL) 64673347b07SNate Lawson return (ENOMEM); 64773347b07SNate Lawson level->abs_set = sets[i]; 64888c9b54cSNate Lawson level->total_set = sets[i]; 64988c9b54cSNate Lawson level->total_set.dev = NULL; 65088c9b54cSNate Lawson sc->all_count++; 65173347b07SNate Lawson 65273347b07SNate Lawson if (TAILQ_EMPTY(list)) { 6538d913481SNate Lawson CF_DEBUG("adding abs setting %d at head\n", 6548d913481SNate Lawson sets[i].freq); 65573347b07SNate Lawson TAILQ_INSERT_HEAD(list, level, link); 65673347b07SNate Lawson continue; 65773347b07SNate Lawson } 65873347b07SNate Lawson 65973347b07SNate Lawson TAILQ_FOREACH_REVERSE(search, list, cf_level_lst, link) { 66088c9b54cSNate Lawson if (sets[i].freq <= search->total_set.freq) { 6618d913481SNate Lawson CF_DEBUG("adding abs setting %d after %d\n", 6628d913481SNate Lawson sets[i].freq, search->total_set.freq); 66373347b07SNate Lawson TAILQ_INSERT_AFTER(list, search, level, link); 66473347b07SNate Lawson break; 66573347b07SNate Lawson } 66673347b07SNate Lawson } 66773347b07SNate Lawson } 66873347b07SNate Lawson return (0); 66973347b07SNate Lawson } 67073347b07SNate Lawson 67188c9b54cSNate Lawson /* 67288c9b54cSNate Lawson * Expand a group of relative settings, creating derived levels from them. 67388c9b54cSNate Lawson */ 67488c9b54cSNate Lawson static int 67588c9b54cSNate Lawson cpufreq_expand_set(struct cpufreq_softc *sc, struct cf_setting_array *set_arr) 67688c9b54cSNate Lawson { 67788c9b54cSNate Lawson struct cf_level *fill, *search; 67888c9b54cSNate Lawson struct cf_setting *set; 67988c9b54cSNate Lawson int i; 68088c9b54cSNate Lawson 681789f03ceSNate Lawson CF_MTX_ASSERT(&sc->lock); 682789f03ceSNate Lawson 6835308b2a6SNate Lawson /* 6845308b2a6SNate Lawson * Walk the set of all existing levels in reverse. This is so we 6855308b2a6SNate Lawson * create derived states from the lowest absolute settings first 6865308b2a6SNate Lawson * and discard duplicates created from higher absolute settings. 6875308b2a6SNate Lawson * For instance, a level of 50 Mhz derived from 100 Mhz + 50% is 6885308b2a6SNate Lawson * preferable to 200 Mhz + 25% because absolute settings are more 6895308b2a6SNate Lawson * efficient since they often change the voltage as well. 6905308b2a6SNate Lawson */ 6915308b2a6SNate Lawson TAILQ_FOREACH_REVERSE(search, &sc->all_levels, cf_level_lst, link) { 69288c9b54cSNate Lawson /* Add each setting to the level, duplicating if necessary. */ 69388c9b54cSNate Lawson for (i = 0; i < set_arr->count; i++) { 69488c9b54cSNate Lawson set = &set_arr->sets[i]; 69588c9b54cSNate Lawson 69688c9b54cSNate Lawson /* 69788c9b54cSNate Lawson * If this setting is less than 100%, split the level 69888c9b54cSNate Lawson * into two and add this setting to the new level. 69988c9b54cSNate Lawson */ 70088c9b54cSNate Lawson fill = search; 7015308b2a6SNate Lawson if (set->freq < 10000) { 70288c9b54cSNate Lawson fill = cpufreq_dup_set(sc, search, set); 70388c9b54cSNate Lawson 70488c9b54cSNate Lawson /* 7055308b2a6SNate Lawson * The new level was a duplicate of an existing 7065308b2a6SNate Lawson * level or its absolute setting is too high 7075308b2a6SNate Lawson * so we freed it. For example, we discard a 7085308b2a6SNate Lawson * derived level of 1000 MHz/25% if a level 7095308b2a6SNate Lawson * of 500 MHz/100% already exists. 71088c9b54cSNate Lawson */ 71188c9b54cSNate Lawson if (fill == NULL) 7125308b2a6SNate Lawson break; 7135308b2a6SNate Lawson } 71488c9b54cSNate Lawson 71588c9b54cSNate Lawson /* Add this setting to the existing or new level. */ 71688c9b54cSNate Lawson KASSERT(fill->rel_count < MAX_SETTINGS, 71788c9b54cSNate Lawson ("cpufreq: too many relative drivers (%d)", 71888c9b54cSNate Lawson MAX_SETTINGS)); 71988c9b54cSNate Lawson fill->rel_set[fill->rel_count] = *set; 72088c9b54cSNate Lawson fill->rel_count++; 7218d913481SNate Lawson CF_DEBUG( 7228d913481SNate Lawson "expand set added rel setting %d%% to %d level\n", 7238d913481SNate Lawson set->freq / 100, fill->total_set.freq); 72488c9b54cSNate Lawson } 72588c9b54cSNate Lawson } 72688c9b54cSNate Lawson 72788c9b54cSNate Lawson return (0); 72888c9b54cSNate Lawson } 72988c9b54cSNate Lawson 73088c9b54cSNate Lawson static struct cf_level * 73188c9b54cSNate Lawson cpufreq_dup_set(struct cpufreq_softc *sc, struct cf_level *dup, 73288c9b54cSNate Lawson struct cf_setting *set) 73388c9b54cSNate Lawson { 73488c9b54cSNate Lawson struct cf_level_lst *list; 73588c9b54cSNate Lawson struct cf_level *fill, *itr; 73688c9b54cSNate Lawson struct cf_setting *fill_set, *itr_set; 73788c9b54cSNate Lawson int i; 73888c9b54cSNate Lawson 739789f03ceSNate Lawson CF_MTX_ASSERT(&sc->lock); 740789f03ceSNate Lawson 74188c9b54cSNate Lawson /* 74288c9b54cSNate Lawson * Create a new level, copy it from the old one, and update the 74388c9b54cSNate Lawson * total frequency and power by the percentage specified in the 74488c9b54cSNate Lawson * relative setting. 74588c9b54cSNate Lawson */ 74688c9b54cSNate Lawson fill = malloc(sizeof(*fill), M_TEMP, M_NOWAIT); 74788c9b54cSNate Lawson if (fill == NULL) 74888c9b54cSNate Lawson return (NULL); 74988c9b54cSNate Lawson *fill = *dup; 75088c9b54cSNate Lawson fill_set = &fill->total_set; 75188c9b54cSNate Lawson fill_set->freq = 75288c9b54cSNate Lawson ((uint64_t)fill_set->freq * set->freq) / 10000; 75388c9b54cSNate Lawson if (fill_set->power != CPUFREQ_VAL_UNKNOWN) { 75488c9b54cSNate Lawson fill_set->power = ((uint64_t)fill_set->power * set->freq) 75588c9b54cSNate Lawson / 10000; 75688c9b54cSNate Lawson } 75788c9b54cSNate Lawson if (set->lat != CPUFREQ_VAL_UNKNOWN) { 75888c9b54cSNate Lawson if (fill_set->lat != CPUFREQ_VAL_UNKNOWN) 75988c9b54cSNate Lawson fill_set->lat += set->lat; 76088c9b54cSNate Lawson else 76188c9b54cSNate Lawson fill_set->lat = set->lat; 76288c9b54cSNate Lawson } 7638d913481SNate Lawson CF_DEBUG("dup set considering derived setting %d\n", fill_set->freq); 76488c9b54cSNate Lawson 76588c9b54cSNate Lawson /* 76688c9b54cSNate Lawson * If we copied an old level that we already modified (say, at 100%), 76788c9b54cSNate Lawson * we need to remove that setting before adding this one. Since we 76888c9b54cSNate Lawson * process each setting array in order, we know any settings for this 76988c9b54cSNate Lawson * driver will be found at the end. 77088c9b54cSNate Lawson */ 77188c9b54cSNate Lawson for (i = fill->rel_count; i != 0; i--) { 77288c9b54cSNate Lawson if (fill->rel_set[i - 1].dev != set->dev) 77388c9b54cSNate Lawson break; 7748d913481SNate Lawson CF_DEBUG("removed last relative driver: %s\n", 7758d913481SNate Lawson device_get_nameunit(set->dev)); 77688c9b54cSNate Lawson fill->rel_count--; 77788c9b54cSNate Lawson } 77888c9b54cSNate Lawson 77988c9b54cSNate Lawson /* 7805308b2a6SNate Lawson * Insert the new level in sorted order. If it is a duplicate of an 7815308b2a6SNate Lawson * existing level (1) or has an absolute setting higher than the 7825308b2a6SNate Lawson * existing level (2), do not add it. We can do this since any such 7835308b2a6SNate Lawson * level is guaranteed use less power. For example (1), a level with 7845308b2a6SNate Lawson * one absolute setting of 800 Mhz uses less power than one composed 7855308b2a6SNate Lawson * of an absolute setting of 1600 Mhz and a relative setting at 50%. 7865308b2a6SNate Lawson * Also for example (2), a level of 800 Mhz/75% is preferable to 7875308b2a6SNate Lawson * 1600 Mhz/25% even though the latter has a lower total frequency. 78888c9b54cSNate Lawson */ 78988c9b54cSNate Lawson list = &sc->all_levels; 7905308b2a6SNate Lawson KASSERT(!TAILQ_EMPTY(list), ("all levels list empty in dup set")); 79188c9b54cSNate Lawson TAILQ_FOREACH_REVERSE(itr, list, cf_level_lst, link) { 79288c9b54cSNate Lawson itr_set = &itr->total_set; 7939000b91eSNate Lawson if (CPUFREQ_CMP(fill_set->freq, itr_set->freq)) { 7949000b91eSNate Lawson CF_DEBUG("dup set rejecting %d (dupe)\n", 7959000b91eSNate Lawson fill_set->freq); 7969000b91eSNate Lawson itr = NULL; 7979000b91eSNate Lawson break; 7989000b91eSNate Lawson } else if (fill_set->freq < itr_set->freq) { 7999000b91eSNate Lawson if (fill->abs_set.freq <= itr->abs_set.freq) { 8008d913481SNate Lawson CF_DEBUG( 8018d913481SNate Lawson "dup done, inserting new level %d after %d\n", 8028d913481SNate Lawson fill_set->freq, itr_set->freq); 80388c9b54cSNate Lawson TAILQ_INSERT_AFTER(list, itr, fill, link); 80488c9b54cSNate Lawson sc->all_count++; 8059000b91eSNate Lawson } else { 8069000b91eSNate Lawson CF_DEBUG("dup set rejecting %d (abs too big)\n", 8079000b91eSNate Lawson fill_set->freq); 8089000b91eSNate Lawson itr = NULL; 8099000b91eSNate Lawson } 81088c9b54cSNate Lawson break; 81188c9b54cSNate Lawson } 81288c9b54cSNate Lawson } 8135308b2a6SNate Lawson 8145308b2a6SNate Lawson /* We didn't find a good place for this new level so free it. */ 8155308b2a6SNate Lawson if (itr == NULL) { 8165308b2a6SNate Lawson CF_DEBUG("dup set freeing new level %d (not optimal)\n", 8175308b2a6SNate Lawson fill_set->freq); 8185308b2a6SNate Lawson free(fill, M_TEMP); 8195308b2a6SNate Lawson fill = NULL; 82088c9b54cSNate Lawson } 82188c9b54cSNate Lawson 82288c9b54cSNate Lawson return (fill); 82388c9b54cSNate Lawson } 82488c9b54cSNate Lawson 82573347b07SNate Lawson static int 82673347b07SNate Lawson cpufreq_curr_sysctl(SYSCTL_HANDLER_ARGS) 82773347b07SNate Lawson { 82873347b07SNate Lawson struct cpufreq_softc *sc; 82973347b07SNate Lawson struct cf_level *levels; 8300325089dSNate Lawson int count, devcount, error, freq, i, n; 8310325089dSNate Lawson device_t *devs; 83273347b07SNate Lawson 8330325089dSNate Lawson devs = NULL; 83473347b07SNate Lawson sc = oidp->oid_arg1; 8350325089dSNate Lawson levels = malloc(CF_MAX_LEVELS * sizeof(*levels), M_TEMP, M_NOWAIT); 83673347b07SNate Lawson if (levels == NULL) 83773347b07SNate Lawson return (ENOMEM); 83873347b07SNate Lawson 83973347b07SNate Lawson error = CPUFREQ_GET(sc->dev, &levels[0]); 84073347b07SNate Lawson if (error) 84173347b07SNate Lawson goto out; 84273347b07SNate Lawson freq = levels[0].total_set.freq; 84373347b07SNate Lawson error = sysctl_handle_int(oidp, &freq, 0, req); 84473347b07SNate Lawson if (error != 0 || req->newptr == NULL) 84573347b07SNate Lawson goto out; 84673347b07SNate Lawson 8470325089dSNate Lawson /* 8480325089dSNate Lawson * While we only call cpufreq_get() on one device (assuming all 8490325089dSNate Lawson * CPUs have equal levels), we call cpufreq_set() on all CPUs. 8500325089dSNate Lawson * This is needed for some MP systems. 8510325089dSNate Lawson */ 8520325089dSNate Lawson error = devclass_get_devices(cpufreq_dc, &devs, &devcount); 85373347b07SNate Lawson if (error) 85473347b07SNate Lawson goto out; 8550325089dSNate Lawson for (n = 0; n < devcount; n++) { 8560325089dSNate Lawson count = CF_MAX_LEVELS; 8570325089dSNate Lawson error = CPUFREQ_LEVELS(devs[n], levels, &count); 858d269386aSNate Lawson if (error) { 859d269386aSNate Lawson if (error == E2BIG) 860d269386aSNate Lawson printf( 861d269386aSNate Lawson "cpufreq: need to increase CF_MAX_LEVELS\n"); 8620325089dSNate Lawson break; 863d269386aSNate Lawson } 86473347b07SNate Lawson for (i = 0; i < count; i++) { 86573347b07SNate Lawson if (CPUFREQ_CMP(levels[i].total_set.freq, freq)) { 8660325089dSNate Lawson error = CPUFREQ_SET(devs[n], &levels[i], 86773347b07SNate Lawson CPUFREQ_PRIO_USER); 86873347b07SNate Lawson break; 86973347b07SNate Lawson } 87073347b07SNate Lawson } 8710325089dSNate Lawson if (i == count) { 87273347b07SNate Lawson error = EINVAL; 8730325089dSNate Lawson break; 8740325089dSNate Lawson } 8750325089dSNate Lawson } 87673347b07SNate Lawson 87773347b07SNate Lawson out: 8780325089dSNate Lawson if (devs) 8790325089dSNate Lawson free(devs, M_TEMP); 88073347b07SNate Lawson if (levels) 88173347b07SNate Lawson free(levels, M_TEMP); 88273347b07SNate Lawson return (error); 88373347b07SNate Lawson } 88473347b07SNate Lawson 88573347b07SNate Lawson static int 88673347b07SNate Lawson cpufreq_levels_sysctl(SYSCTL_HANDLER_ARGS) 88773347b07SNate Lawson { 88873347b07SNate Lawson struct cpufreq_softc *sc; 88973347b07SNate Lawson struct cf_level *levels; 89073347b07SNate Lawson struct cf_setting *set; 89173347b07SNate Lawson struct sbuf sb; 89273347b07SNate Lawson int count, error, i; 89373347b07SNate Lawson 89473347b07SNate Lawson sc = oidp->oid_arg1; 89573347b07SNate Lawson sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND); 89673347b07SNate Lawson 89773347b07SNate Lawson /* Get settings from the device and generate the output string. */ 89873347b07SNate Lawson count = CF_MAX_LEVELS; 89973347b07SNate Lawson levels = malloc(count * sizeof(*levels), M_TEMP, M_NOWAIT); 90073347b07SNate Lawson if (levels == NULL) 90173347b07SNate Lawson return (ENOMEM); 90273347b07SNate Lawson error = CPUFREQ_LEVELS(sc->dev, levels, &count); 903d269386aSNate Lawson if (error) { 904d269386aSNate Lawson if (error == E2BIG) 905d269386aSNate Lawson printf("cpufreq: need to increase CF_MAX_LEVELS\n"); 90673347b07SNate Lawson goto out; 907d269386aSNate Lawson } 90873347b07SNate Lawson if (count) { 90973347b07SNate Lawson for (i = 0; i < count; i++) { 91073347b07SNate Lawson set = &levels[i].total_set; 91173347b07SNate Lawson sbuf_printf(&sb, "%d/%d ", set->freq, set->power); 91273347b07SNate Lawson } 91373347b07SNate Lawson } else 91473347b07SNate Lawson sbuf_cpy(&sb, "0"); 91573347b07SNate Lawson sbuf_trim(&sb); 91673347b07SNate Lawson sbuf_finish(&sb); 91773347b07SNate Lawson error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req); 91873347b07SNate Lawson 91973347b07SNate Lawson out: 92073347b07SNate Lawson free(levels, M_TEMP); 92173347b07SNate Lawson sbuf_delete(&sb); 92273347b07SNate Lawson return (error); 92373347b07SNate Lawson } 92473347b07SNate Lawson 925e959a70bSNate Lawson static int 926e959a70bSNate Lawson cpufreq_settings_sysctl(SYSCTL_HANDLER_ARGS) 927e959a70bSNate Lawson { 928e959a70bSNate Lawson device_t dev; 929e959a70bSNate Lawson struct cf_setting *sets; 930e959a70bSNate Lawson struct sbuf sb; 931e959a70bSNate Lawson int error, i, set_count; 932e959a70bSNate Lawson 933e959a70bSNate Lawson dev = oidp->oid_arg1; 934e959a70bSNate Lawson sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND); 935e959a70bSNate Lawson 936e959a70bSNate Lawson /* Get settings from the device and generate the output string. */ 937e959a70bSNate Lawson set_count = MAX_SETTINGS; 938e959a70bSNate Lawson sets = malloc(set_count * sizeof(*sets), M_TEMP, M_NOWAIT); 939e959a70bSNate Lawson if (sets == NULL) 940e959a70bSNate Lawson return (ENOMEM); 941e959a70bSNate Lawson error = CPUFREQ_DRV_SETTINGS(dev, sets, &set_count); 942e959a70bSNate Lawson if (error) 943e959a70bSNate Lawson goto out; 944e959a70bSNate Lawson if (set_count) { 945e959a70bSNate Lawson for (i = 0; i < set_count; i++) 946e959a70bSNate Lawson sbuf_printf(&sb, "%d/%d ", sets[i].freq, sets[i].power); 947e959a70bSNate Lawson } else 948e959a70bSNate Lawson sbuf_cpy(&sb, "0"); 949e959a70bSNate Lawson sbuf_trim(&sb); 950e959a70bSNate Lawson sbuf_finish(&sb); 951e959a70bSNate Lawson error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req); 952e959a70bSNate Lawson 953e959a70bSNate Lawson out: 954e959a70bSNate Lawson free(sets, M_TEMP); 955e959a70bSNate Lawson sbuf_delete(&sb); 956e959a70bSNate Lawson return (error); 957e959a70bSNate Lawson } 958e959a70bSNate Lawson 95973347b07SNate Lawson int 96073347b07SNate Lawson cpufreq_register(device_t dev) 96173347b07SNate Lawson { 96267c8649fSNate Lawson struct cpufreq_softc *sc; 96373347b07SNate Lawson device_t cf_dev, cpu_dev; 96473347b07SNate Lawson 965e959a70bSNate Lawson /* Add a sysctl to get each driver's settings separately. */ 966e959a70bSNate Lawson SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev), 967e959a70bSNate Lawson SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), 968e959a70bSNate Lawson OID_AUTO, "freq_settings", CTLTYPE_STRING | CTLFLAG_RD, dev, 0, 969e959a70bSNate Lawson cpufreq_settings_sysctl, "A", "CPU frequency driver settings"); 970e959a70bSNate Lawson 97173347b07SNate Lawson /* 9720325089dSNate Lawson * Add only one cpufreq device to each CPU. Currently, all CPUs 9730325089dSNate Lawson * must offer the same levels and be switched at the same time. 97473347b07SNate Lawson */ 9750325089dSNate Lawson cpu_dev = device_get_parent(dev); 97667c8649fSNate Lawson if ((cf_dev = device_find_child(cpu_dev, "cpufreq", -1))) { 97767c8649fSNate Lawson sc = device_get_softc(cf_dev); 97867c8649fSNate Lawson sc->max_mhz = CPUFREQ_VAL_UNKNOWN; 97973347b07SNate Lawson return (0); 98067c8649fSNate Lawson } 98173347b07SNate Lawson 9820325089dSNate Lawson /* Add the child device and possibly sysctls. */ 9830325089dSNate Lawson cf_dev = BUS_ADD_CHILD(cpu_dev, 0, "cpufreq", -1); 98473347b07SNate Lawson if (cf_dev == NULL) 98573347b07SNate Lawson return (ENOMEM); 98673347b07SNate Lawson device_quiet(cf_dev); 98773347b07SNate Lawson 98873347b07SNate Lawson return (device_probe_and_attach(cf_dev)); 98973347b07SNate Lawson } 99073347b07SNate Lawson 99173347b07SNate Lawson int 99273347b07SNate Lawson cpufreq_unregister(device_t dev) 99373347b07SNate Lawson { 99473347b07SNate Lawson device_t cf_dev, *devs; 995e94a0c1aSNate Lawson int cfcount, devcount, error, i, type; 99673347b07SNate Lawson 99773347b07SNate Lawson /* 99873347b07SNate Lawson * If this is the last cpufreq child device, remove the control 99973347b07SNate Lawson * device as well. We identify cpufreq children by calling a method 100073347b07SNate Lawson * they support. 100173347b07SNate Lawson */ 100273347b07SNate Lawson error = device_get_children(device_get_parent(dev), &devs, &devcount); 100373347b07SNate Lawson if (error) 100473347b07SNate Lawson return (error); 100567c8649fSNate Lawson cf_dev = device_find_child(device_get_parent(dev), "cpufreq", -1); 100671ab130cSNate Lawson if (cf_dev == NULL) { 100771ab130cSNate Lawson device_printf(dev, 100871ab130cSNate Lawson "warning: cpufreq_unregister called with no cpufreq device active\n"); 100971ab130cSNate Lawson return (0); 101071ab130cSNate Lawson } 101173347b07SNate Lawson cfcount = 0; 101273347b07SNate Lawson for (i = 0; i < devcount; i++) { 101373347b07SNate Lawson if (!device_is_attached(devs[i])) 101473347b07SNate Lawson continue; 1015e94a0c1aSNate Lawson if (CPUFREQ_DRV_TYPE(devs[i], &type) == 0) 101673347b07SNate Lawson cfcount++; 101773347b07SNate Lawson } 10180325089dSNate Lawson if (cfcount <= 1) 101973347b07SNate Lawson device_delete_child(device_get_parent(cf_dev), cf_dev); 102073347b07SNate Lawson free(devs, M_TEMP); 102173347b07SNate Lawson 102273347b07SNate Lawson return (0); 102373347b07SNate Lawson } 1024