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> 3573347b07SNate Lawson #include <sys/malloc.h> 3673347b07SNate Lawson #include <sys/module.h> 3773347b07SNate Lawson #include <sys/proc.h> 3873347b07SNate Lawson #include <sys/queue.h> 3973347b07SNate Lawson #include <sys/sched.h> 4073347b07SNate Lawson #include <sys/sysctl.h> 4173347b07SNate Lawson #include <sys/systm.h> 4273347b07SNate Lawson #include <sys/sbuf.h> 430325089dSNate Lawson #include <sys/timetc.h> 4473347b07SNate Lawson 4573347b07SNate Lawson #include "cpufreq_if.h" 4673347b07SNate Lawson 4773347b07SNate Lawson /* 4873347b07SNate Lawson * Common CPU frequency glue code. Drivers for specific hardware can 4973347b07SNate Lawson * attach this interface to allow users to get/set the CPU frequency. 5073347b07SNate Lawson */ 5173347b07SNate Lawson 5273347b07SNate Lawson /* 5373347b07SNate Lawson * Number of levels we can handle. Levels are synthesized from settings 54d269386aSNate Lawson * so for M settings and N drivers, there may be M*N levels. 5573347b07SNate Lawson */ 56d269386aSNate Lawson #define CF_MAX_LEVELS 64 5773347b07SNate Lawson 5873347b07SNate Lawson struct cpufreq_softc { 5973347b07SNate Lawson struct cf_level curr_level; 605f0afa04SNate Lawson int curr_priority; 615f0afa04SNate Lawson struct cf_level saved_level; 625f0afa04SNate Lawson int saved_priority; 6373347b07SNate Lawson struct cf_level_lst all_levels; 645f0afa04SNate Lawson int all_count; 6567c8649fSNate Lawson int max_mhz; 6673347b07SNate Lawson device_t dev; 6773347b07SNate Lawson struct sysctl_ctx_list sysctl_ctx; 6873347b07SNate Lawson }; 6973347b07SNate Lawson 7073347b07SNate Lawson struct cf_setting_array { 7173347b07SNate Lawson struct cf_setting sets[MAX_SETTINGS]; 7273347b07SNate Lawson int count; 7373347b07SNate Lawson TAILQ_ENTRY(cf_setting_array) link; 7473347b07SNate Lawson }; 7573347b07SNate Lawson 7673347b07SNate Lawson TAILQ_HEAD(cf_setting_lst, cf_setting_array); 7773347b07SNate Lawson 7873347b07SNate Lawson static int cpufreq_attach(device_t dev); 7973347b07SNate Lawson static int cpufreq_detach(device_t dev); 8073347b07SNate Lawson static void cpufreq_evaluate(void *arg); 8173347b07SNate Lawson static int cf_set_method(device_t dev, const struct cf_level *level, 8273347b07SNate Lawson int priority); 8373347b07SNate Lawson static int cf_get_method(device_t dev, struct cf_level *level); 8473347b07SNate Lawson static int cf_levels_method(device_t dev, struct cf_level *levels, 8573347b07SNate Lawson int *count); 8688c9b54cSNate Lawson static int cpufreq_insert_abs(struct cpufreq_softc *sc, 8773347b07SNate Lawson struct cf_setting *sets, int count); 8888c9b54cSNate Lawson static int cpufreq_expand_set(struct cpufreq_softc *sc, 8988c9b54cSNate Lawson struct cf_setting_array *set_arr); 9088c9b54cSNate Lawson static struct cf_level *cpufreq_dup_set(struct cpufreq_softc *sc, 9188c9b54cSNate Lawson struct cf_level *dup, struct cf_setting *set); 9273347b07SNate Lawson static int cpufreq_curr_sysctl(SYSCTL_HANDLER_ARGS); 9373347b07SNate Lawson static int cpufreq_levels_sysctl(SYSCTL_HANDLER_ARGS); 94e959a70bSNate Lawson static int cpufreq_settings_sysctl(SYSCTL_HANDLER_ARGS); 9573347b07SNate Lawson 9673347b07SNate Lawson static device_method_t cpufreq_methods[] = { 9773347b07SNate Lawson DEVMETHOD(device_probe, bus_generic_probe), 9873347b07SNate Lawson DEVMETHOD(device_attach, cpufreq_attach), 9973347b07SNate Lawson DEVMETHOD(device_detach, cpufreq_detach), 10073347b07SNate Lawson 10173347b07SNate Lawson DEVMETHOD(cpufreq_set, cf_set_method), 10273347b07SNate Lawson DEVMETHOD(cpufreq_get, cf_get_method), 10373347b07SNate Lawson DEVMETHOD(cpufreq_levels, cf_levels_method), 10473347b07SNate Lawson {0, 0} 10573347b07SNate Lawson }; 10673347b07SNate Lawson static driver_t cpufreq_driver = { 10773347b07SNate Lawson "cpufreq", cpufreq_methods, sizeof(struct cpufreq_softc) 10873347b07SNate Lawson }; 10973347b07SNate Lawson static devclass_t cpufreq_dc; 11073347b07SNate Lawson DRIVER_MODULE(cpufreq, cpu, cpufreq_driver, cpufreq_dc, 0, 0); 11173347b07SNate Lawson 11273347b07SNate Lawson static eventhandler_tag cf_ev_tag; 11373347b07SNate Lawson 114b070969bSNate Lawson static int cf_lowest_freq; 115b070969bSNate Lawson TUNABLE_INT("debug.cpufreq.lowest", &cf_lowest_freq); 116b070969bSNate Lawson SYSCTL_NODE(_debug, OID_AUTO, cpufreq, CTLFLAG_RD, NULL, "cpufreq debugging"); 117b070969bSNate Lawson SYSCTL_INT(_debug_cpufreq, OID_AUTO, lowest, CTLFLAG_RW, &cf_lowest_freq, 1, 118b070969bSNate Lawson "Don't provide levels below this frequency."); 119b070969bSNate Lawson 12073347b07SNate Lawson static int 12173347b07SNate Lawson cpufreq_attach(device_t dev) 12273347b07SNate Lawson { 12373347b07SNate Lawson struct cpufreq_softc *sc; 12473347b07SNate Lawson device_t parent; 12573347b07SNate Lawson int numdevs; 12673347b07SNate Lawson 12773347b07SNate Lawson sc = device_get_softc(dev); 12873347b07SNate Lawson parent = device_get_parent(dev); 12973347b07SNate Lawson sc->dev = dev; 13073347b07SNate Lawson sysctl_ctx_init(&sc->sysctl_ctx); 13173347b07SNate Lawson TAILQ_INIT(&sc->all_levels); 13273347b07SNate Lawson sc->curr_level.total_set.freq = CPUFREQ_VAL_UNKNOWN; 1335f0afa04SNate Lawson sc->saved_level.total_set.freq = CPUFREQ_VAL_UNKNOWN; 13467c8649fSNate Lawson sc->max_mhz = CPUFREQ_VAL_UNKNOWN; 13573347b07SNate Lawson 13673347b07SNate Lawson /* 13773347b07SNate Lawson * Only initialize one set of sysctls for all CPUs. In the future, 13873347b07SNate Lawson * if multiple CPUs can have different settings, we can move these 13973347b07SNate Lawson * sysctls to be under every CPU instead of just the first one. 14073347b07SNate Lawson */ 14173347b07SNate Lawson numdevs = devclass_get_count(cpufreq_dc); 14273347b07SNate Lawson if (numdevs > 1) 14373347b07SNate Lawson return (0); 14473347b07SNate Lawson 14573347b07SNate Lawson SYSCTL_ADD_PROC(&sc->sysctl_ctx, 14673347b07SNate Lawson SYSCTL_CHILDREN(device_get_sysctl_tree(parent)), 14773347b07SNate Lawson OID_AUTO, "freq", CTLTYPE_INT | CTLFLAG_RW, sc, 0, 14873347b07SNate Lawson cpufreq_curr_sysctl, "I", "Current CPU frequency"); 14973347b07SNate Lawson SYSCTL_ADD_PROC(&sc->sysctl_ctx, 15073347b07SNate Lawson SYSCTL_CHILDREN(device_get_sysctl_tree(parent)), 15173347b07SNate Lawson OID_AUTO, "freq_levels", CTLTYPE_STRING | CTLFLAG_RD, sc, 0, 15273347b07SNate Lawson cpufreq_levels_sysctl, "A", "CPU frequency levels"); 15373347b07SNate Lawson cf_ev_tag = EVENTHANDLER_REGISTER(cpufreq_changed, cpufreq_evaluate, 15473347b07SNate Lawson NULL, EVENTHANDLER_PRI_ANY); 15573347b07SNate Lawson 15673347b07SNate Lawson return (0); 15773347b07SNate Lawson } 15873347b07SNate Lawson 15973347b07SNate Lawson static int 16073347b07SNate Lawson cpufreq_detach(device_t dev) 16173347b07SNate Lawson { 16273347b07SNate Lawson struct cpufreq_softc *sc; 16373347b07SNate Lawson int numdevs; 16473347b07SNate Lawson 16573347b07SNate Lawson sc = device_get_softc(dev); 16673347b07SNate Lawson sysctl_ctx_free(&sc->sysctl_ctx); 16773347b07SNate Lawson 16873347b07SNate Lawson /* Only clean up these resources when the last device is detaching. */ 16973347b07SNate Lawson numdevs = devclass_get_count(cpufreq_dc); 17073347b07SNate Lawson if (numdevs == 1) 17173347b07SNate Lawson EVENTHANDLER_DEREGISTER(cpufreq_changed, cf_ev_tag); 17273347b07SNate Lawson 17373347b07SNate Lawson return (0); 17473347b07SNate Lawson } 17573347b07SNate Lawson 17673347b07SNate Lawson static void 17773347b07SNate Lawson cpufreq_evaluate(void *arg) 17873347b07SNate Lawson { 17973347b07SNate Lawson /* TODO: Re-evaluate when notified of changes to drivers. */ 18073347b07SNate Lawson } 18173347b07SNate Lawson 18273347b07SNate Lawson static int 18373347b07SNate Lawson cf_set_method(device_t dev, const struct cf_level *level, int priority) 18473347b07SNate Lawson { 18573347b07SNate Lawson struct cpufreq_softc *sc; 18673347b07SNate Lawson const struct cf_setting *set; 1870325089dSNate Lawson struct pcpu *pc; 1880325089dSNate Lawson int cpu_id, error, i; 18973347b07SNate Lawson 19073347b07SNate Lawson sc = device_get_softc(dev); 19173347b07SNate Lawson 1920325089dSNate Lawson /* 1930325089dSNate Lawson * Check that the TSC isn't being used as a timecounter. 1940325089dSNate Lawson * If it is, then return EBUSY and refuse to change the 1950325089dSNate Lawson * clock speed. 1960325089dSNate Lawson */ 1970325089dSNate Lawson if (strcmp(timecounter->tc_name, "TSC") == 0) 1980325089dSNate Lawson return (EBUSY); 1990325089dSNate Lawson 2005f0afa04SNate Lawson /* 2015f0afa04SNate Lawson * If the caller didn't specify a level and one is saved, prepare to 2025f0afa04SNate Lawson * restore the saved level. If none has been saved, return an error. 2035f0afa04SNate Lawson * If they did specify one, but the requested level has a lower 2045f0afa04SNate Lawson * priority, don't allow the new level right now. 2055f0afa04SNate Lawson */ 2065f0afa04SNate Lawson if (level == NULL) { 2075f0afa04SNate Lawson if (sc->saved_level.total_set.freq != CPUFREQ_VAL_UNKNOWN) { 2085f0afa04SNate Lawson level = &sc->saved_level; 2095f0afa04SNate Lawson priority = sc->saved_priority; 2105f0afa04SNate Lawson } else 2115f0afa04SNate Lawson return (ENXIO); 2125f0afa04SNate Lawson } else if (priority < sc->curr_priority) 2135f0afa04SNate Lawson return (EPERM); 2145f0afa04SNate Lawson 215b070969bSNate Lawson /* Reject levels that are below our specified threshold. */ 216b070969bSNate Lawson if (level->total_set.freq <= cf_lowest_freq) 217b070969bSNate Lawson return (EINVAL); 218b070969bSNate Lawson 21973347b07SNate Lawson /* If already at this level, just return. */ 22073347b07SNate Lawson if (CPUFREQ_CMP(sc->curr_level.total_set.freq, level->total_set.freq)) 22173347b07SNate Lawson return (0); 22273347b07SNate Lawson 22373347b07SNate Lawson /* First, set the absolute frequency via its driver. */ 22473347b07SNate Lawson set = &level->abs_set; 22573347b07SNate Lawson if (set->dev) { 22673347b07SNate Lawson if (!device_is_attached(set->dev)) { 22773347b07SNate Lawson error = ENXIO; 22873347b07SNate Lawson goto out; 22973347b07SNate Lawson } 2301196826aSNate Lawson 2311196826aSNate Lawson /* Bind to the target CPU before switching, if necessary. */ 2321196826aSNate Lawson cpu_id = PCPU_GET(cpuid); 2331196826aSNate Lawson pc = cpu_get_pcpu(set->dev); 2341196826aSNate Lawson if (cpu_id != pc->pc_cpuid) { 2351196826aSNate Lawson mtx_lock_spin(&sched_lock); 2361196826aSNate Lawson sched_bind(curthread, pc->pc_cpuid); 2371196826aSNate Lawson mtx_unlock_spin(&sched_lock); 2381196826aSNate Lawson } 23973347b07SNate Lawson error = CPUFREQ_DRV_SET(set->dev, set); 2401196826aSNate Lawson if (cpu_id != pc->pc_cpuid) { 2411196826aSNate Lawson mtx_lock_spin(&sched_lock); 2421196826aSNate Lawson sched_unbind(curthread); 2431196826aSNate Lawson mtx_unlock_spin(&sched_lock); 2441196826aSNate Lawson } 24573347b07SNate Lawson if (error) { 24673347b07SNate Lawson goto out; 24773347b07SNate Lawson } 24873347b07SNate Lawson } 24973347b07SNate Lawson 25088c9b54cSNate Lawson /* Next, set any/all relative frequencies via their drivers. */ 25188c9b54cSNate Lawson for (i = 0; i < level->rel_count; i++) { 25288c9b54cSNate Lawson set = &level->rel_set[i]; 25388c9b54cSNate Lawson if (!device_is_attached(set->dev)) { 25488c9b54cSNate Lawson error = ENXIO; 25588c9b54cSNate Lawson goto out; 25688c9b54cSNate Lawson } 2571196826aSNate Lawson 2581196826aSNate Lawson /* Bind to the target CPU before switching, if necessary. */ 2591196826aSNate Lawson cpu_id = PCPU_GET(cpuid); 2601196826aSNate Lawson pc = cpu_get_pcpu(set->dev); 2611196826aSNate Lawson if (cpu_id != pc->pc_cpuid) { 2621196826aSNate Lawson mtx_lock_spin(&sched_lock); 2631196826aSNate Lawson sched_bind(curthread, pc->pc_cpuid); 2641196826aSNate Lawson mtx_unlock_spin(&sched_lock); 2651196826aSNate Lawson } 26688c9b54cSNate Lawson error = CPUFREQ_DRV_SET(set->dev, set); 2671196826aSNate Lawson if (cpu_id != pc->pc_cpuid) { 2681196826aSNate Lawson mtx_lock_spin(&sched_lock); 2691196826aSNate Lawson sched_unbind(curthread); 2701196826aSNate Lawson mtx_unlock_spin(&sched_lock); 2711196826aSNate Lawson } 27288c9b54cSNate Lawson if (error) { 27388c9b54cSNate Lawson /* XXX Back out any successful setting? */ 27488c9b54cSNate Lawson goto out; 27588c9b54cSNate Lawson } 27688c9b54cSNate Lawson } 27773347b07SNate Lawson 2785f0afa04SNate Lawson /* If we were restoring a saved state, reset it to "unused". */ 2795f0afa04SNate Lawson if (level == &sc->saved_level) { 2805f0afa04SNate Lawson sc->saved_level.total_set.freq = CPUFREQ_VAL_UNKNOWN; 2815f0afa04SNate Lawson sc->saved_priority = 0; 2825f0afa04SNate Lawson } 2835f0afa04SNate Lawson 2845f0afa04SNate Lawson /* 2855f0afa04SNate Lawson * Before recording the current level, check if we're going to a 2865f0afa04SNate Lawson * higher priority and have not saved a level yet. If so, save the 2875f0afa04SNate Lawson * previous level and priority. 2885f0afa04SNate Lawson */ 2895f0afa04SNate Lawson if (sc->curr_level.total_set.freq != CPUFREQ_VAL_UNKNOWN && 2905f0afa04SNate Lawson sc->saved_level.total_set.freq == CPUFREQ_VAL_UNKNOWN && 2915f0afa04SNate Lawson priority > sc->curr_priority) { 2925f0afa04SNate Lawson sc->saved_level = sc->curr_level; 2935f0afa04SNate Lawson sc->saved_priority = sc->curr_priority; 2945f0afa04SNate Lawson } 29573347b07SNate Lawson sc->curr_level = *level; 2965f0afa04SNate Lawson sc->curr_priority = priority; 29773347b07SNate Lawson error = 0; 29873347b07SNate Lawson 29973347b07SNate Lawson out: 30073347b07SNate Lawson if (error) 30173347b07SNate Lawson device_printf(set->dev, "set freq failed, err %d\n", error); 30273347b07SNate Lawson return (error); 30373347b07SNate Lawson } 30473347b07SNate Lawson 30573347b07SNate Lawson static int 30673347b07SNate Lawson cf_get_method(device_t dev, struct cf_level *level) 30773347b07SNate Lawson { 30873347b07SNate Lawson struct cpufreq_softc *sc; 30973347b07SNate Lawson struct cf_level *levels; 31073347b07SNate Lawson struct cf_setting *curr_set, set; 31173347b07SNate Lawson struct pcpu *pc; 31273347b07SNate Lawson device_t *devs; 31373347b07SNate Lawson int count, error, i, numdevs; 31473347b07SNate Lawson uint64_t rate; 31573347b07SNate Lawson 31673347b07SNate Lawson sc = device_get_softc(dev); 31773347b07SNate Lawson curr_set = &sc->curr_level.total_set; 31873347b07SNate Lawson levels = NULL; 31973347b07SNate Lawson 32073347b07SNate Lawson /* If we already know the current frequency, we're done. */ 32173347b07SNate Lawson if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) 32273347b07SNate Lawson goto out; 32373347b07SNate Lawson 32473347b07SNate Lawson /* 32573347b07SNate Lawson * We need to figure out the current level. Loop through every 32673347b07SNate Lawson * driver, getting the current setting. Then, attempt to get a best 32773347b07SNate Lawson * match of settings against each level. 32873347b07SNate Lawson */ 32973347b07SNate Lawson count = CF_MAX_LEVELS; 33073347b07SNate Lawson levels = malloc(count * sizeof(*levels), M_TEMP, M_NOWAIT); 33173347b07SNate Lawson if (levels == NULL) 33273347b07SNate Lawson return (ENOMEM); 33373347b07SNate Lawson error = CPUFREQ_LEVELS(sc->dev, levels, &count); 334d269386aSNate Lawson if (error) { 335d269386aSNate Lawson if (error == E2BIG) 336d269386aSNate Lawson printf("cpufreq: need to increase CF_MAX_LEVELS\n"); 33773347b07SNate Lawson goto out; 338d269386aSNate Lawson } 33973347b07SNate Lawson error = device_get_children(device_get_parent(dev), &devs, &numdevs); 34073347b07SNate Lawson if (error) 34173347b07SNate Lawson goto out; 34273347b07SNate Lawson for (i = 0; i < numdevs && curr_set->freq == CPUFREQ_VAL_UNKNOWN; i++) { 34373347b07SNate Lawson if (!device_is_attached(devs[i])) 34473347b07SNate Lawson continue; 34573347b07SNate Lawson error = CPUFREQ_DRV_GET(devs[i], &set); 34673347b07SNate Lawson if (error) 34773347b07SNate Lawson continue; 34873347b07SNate Lawson for (i = 0; i < count; i++) { 34988c9b54cSNate Lawson if (CPUFREQ_CMP(set.freq, levels[i].total_set.freq)) { 35073347b07SNate Lawson sc->curr_level = levels[i]; 35173347b07SNate Lawson break; 35273347b07SNate Lawson } 35373347b07SNate Lawson } 35473347b07SNate Lawson } 35573347b07SNate Lawson free(devs, M_TEMP); 35673347b07SNate Lawson if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) 35773347b07SNate Lawson goto out; 35873347b07SNate Lawson 35973347b07SNate Lawson /* 36073347b07SNate Lawson * We couldn't find an exact match, so attempt to estimate and then 36173347b07SNate Lawson * match against a level. 36273347b07SNate Lawson */ 36373347b07SNate Lawson pc = cpu_get_pcpu(dev); 36473347b07SNate Lawson if (pc == NULL) { 36573347b07SNate Lawson error = ENXIO; 36673347b07SNate Lawson goto out; 36773347b07SNate Lawson } 36873347b07SNate Lawson cpu_est_clockrate(pc->pc_cpuid, &rate); 36973347b07SNate Lawson rate /= 1000000; 37073347b07SNate Lawson for (i = 0; i < count; i++) { 37173347b07SNate Lawson if (CPUFREQ_CMP(rate, levels[i].total_set.freq)) { 37273347b07SNate Lawson sc->curr_level = levels[i]; 37373347b07SNate Lawson break; 37473347b07SNate Lawson } 37573347b07SNate Lawson } 37673347b07SNate Lawson 37773347b07SNate Lawson out: 37873347b07SNate Lawson if (levels) 37973347b07SNate Lawson free(levels, M_TEMP); 38073347b07SNate Lawson *level = sc->curr_level; 38173347b07SNate Lawson return (0); 38273347b07SNate Lawson } 38373347b07SNate Lawson 38473347b07SNate Lawson static int 38573347b07SNate Lawson cf_levels_method(device_t dev, struct cf_level *levels, int *count) 38673347b07SNate Lawson { 38788c9b54cSNate Lawson struct cf_setting_array *set_arr; 38873347b07SNate Lawson struct cf_setting_lst rel_sets; 38973347b07SNate Lawson struct cpufreq_softc *sc; 39073347b07SNate Lawson struct cf_level *lev; 39173347b07SNate Lawson struct cf_setting *sets; 39273347b07SNate Lawson struct pcpu *pc; 39373347b07SNate Lawson device_t *devs; 39488c9b54cSNate Lawson int error, i, numdevs, set_count, type; 39573347b07SNate Lawson uint64_t rate; 39673347b07SNate Lawson 39773347b07SNate Lawson if (levels == NULL || count == NULL) 39873347b07SNate Lawson return (EINVAL); 39973347b07SNate Lawson 40073347b07SNate Lawson TAILQ_INIT(&rel_sets); 40173347b07SNate Lawson sc = device_get_softc(dev); 40273347b07SNate Lawson error = device_get_children(device_get_parent(dev), &devs, &numdevs); 40373347b07SNate Lawson if (error) 40473347b07SNate Lawson return (error); 40573347b07SNate Lawson sets = malloc(MAX_SETTINGS * sizeof(*sets), M_TEMP, M_NOWAIT); 40673347b07SNate Lawson if (sets == NULL) { 40773347b07SNate Lawson free(devs, M_TEMP); 40873347b07SNate Lawson return (ENOMEM); 40973347b07SNate Lawson } 41073347b07SNate Lawson 41173347b07SNate Lawson /* Get settings from all cpufreq drivers. */ 41273347b07SNate Lawson for (i = 0; i < numdevs; i++) { 413e22cd41cSNate Lawson /* Skip devices that aren't ready. */ 41473347b07SNate Lawson if (!device_is_attached(devs[i])) 41573347b07SNate Lawson continue; 416e22cd41cSNate Lawson 417e22cd41cSNate Lawson /* 418e22cd41cSNate Lawson * Get settings, skipping drivers that offer no settings or 419e22cd41cSNate Lawson * provide settings for informational purposes only. 420e22cd41cSNate Lawson */ 421e94a0c1aSNate Lawson error = CPUFREQ_DRV_TYPE(devs[i], &type); 422e94a0c1aSNate Lawson if (error || (type & CPUFREQ_FLAG_INFO_ONLY)) 423e94a0c1aSNate Lawson continue; 42473347b07SNate Lawson set_count = MAX_SETTINGS; 425e94a0c1aSNate Lawson error = CPUFREQ_DRV_SETTINGS(devs[i], sets, &set_count); 426e94a0c1aSNate Lawson if (error || set_count == 0) 42773347b07SNate Lawson continue; 42873347b07SNate Lawson 429e22cd41cSNate Lawson /* Add the settings to our absolute/relative lists. */ 4300325089dSNate Lawson switch (type & CPUFREQ_TYPE_MASK) { 43188c9b54cSNate Lawson case CPUFREQ_TYPE_ABSOLUTE: 43288c9b54cSNate Lawson error = cpufreq_insert_abs(sc, sets, set_count); 43388c9b54cSNate Lawson break; 43488c9b54cSNate Lawson case CPUFREQ_TYPE_RELATIVE: 43588c9b54cSNate Lawson set_arr = malloc(sizeof(*set_arr), M_TEMP, M_NOWAIT); 43688c9b54cSNate Lawson if (set_arr == NULL) { 43788c9b54cSNate Lawson error = ENOMEM; 43888c9b54cSNate Lawson goto out; 43988c9b54cSNate Lawson } 44088c9b54cSNate Lawson bcopy(sets, set_arr->sets, set_count * sizeof(*sets)); 44188c9b54cSNate Lawson set_arr->count = set_count; 44288c9b54cSNate Lawson TAILQ_INSERT_TAIL(&rel_sets, set_arr, link); 44388c9b54cSNate Lawson break; 44488c9b54cSNate Lawson default: 44588c9b54cSNate Lawson error = EINVAL; 44688c9b54cSNate Lawson break; 44788c9b54cSNate Lawson } 44888c9b54cSNate Lawson if (error) 44973347b07SNate Lawson goto out; 45073347b07SNate Lawson } 45173347b07SNate Lawson 45267c8649fSNate Lawson /* 45367c8649fSNate Lawson * If there are no absolute levels, create a fake one at 100%. We 45467c8649fSNate Lawson * then cache the clockrate for later use as our base frequency. 45567c8649fSNate Lawson * 45667c8649fSNate Lawson * XXX This assumes that the first time through, if we only have 45767c8649fSNate Lawson * relative drivers, the CPU is currently running at 100%. 45867c8649fSNate Lawson */ 45973347b07SNate Lawson if (TAILQ_EMPTY(&sc->all_levels)) { 46067c8649fSNate Lawson if (sc->max_mhz == CPUFREQ_VAL_UNKNOWN) { 46173347b07SNate Lawson pc = cpu_get_pcpu(dev); 46273347b07SNate Lawson cpu_est_clockrate(pc->pc_cpuid, &rate); 46367c8649fSNate Lawson sc->max_mhz = rate / 1000000; 46467c8649fSNate Lawson } 46567c8649fSNate Lawson memset(&sets[0], CPUFREQ_VAL_UNKNOWN, sizeof(*sets)); 46667c8649fSNate Lawson sets[0].freq = sc->max_mhz; 46767c8649fSNate Lawson sets[0].dev = NULL; 46888c9b54cSNate Lawson error = cpufreq_insert_abs(sc, sets, 1); 46973347b07SNate Lawson if (error) 47073347b07SNate Lawson goto out; 47173347b07SNate Lawson } 47273347b07SNate Lawson 47388c9b54cSNate Lawson /* Create a combined list of absolute + relative levels. */ 47488c9b54cSNate Lawson TAILQ_FOREACH(set_arr, &rel_sets, link) 47588c9b54cSNate Lawson cpufreq_expand_set(sc, set_arr); 47688c9b54cSNate Lawson 47788c9b54cSNate Lawson /* If the caller doesn't have enough space, return the actual count. */ 47888c9b54cSNate Lawson if (sc->all_count > *count) { 47988c9b54cSNate Lawson *count = sc->all_count; 48088c9b54cSNate Lawson error = E2BIG; 48188c9b54cSNate Lawson goto out; 48288c9b54cSNate Lawson } 48388c9b54cSNate Lawson 48488c9b54cSNate Lawson /* Finally, output the list of levels. */ 48573347b07SNate Lawson i = 0; 48673347b07SNate Lawson TAILQ_FOREACH(lev, &sc->all_levels, link) { 487b070969bSNate Lawson /* Skip levels that have a frequency that is too low. */ 488b070969bSNate Lawson if (lev->total_set.freq <= cf_lowest_freq) { 489b070969bSNate Lawson sc->all_count--; 490b070969bSNate Lawson continue; 491b070969bSNate Lawson } 492b070969bSNate Lawson 49373347b07SNate Lawson levels[i] = *lev; 49473347b07SNate Lawson i++; 49573347b07SNate Lawson } 49688c9b54cSNate Lawson *count = sc->all_count; 49773347b07SNate Lawson error = 0; 49873347b07SNate Lawson 49973347b07SNate Lawson out: 50073347b07SNate Lawson /* Clear all levels since we regenerate them each time. */ 50173347b07SNate Lawson while ((lev = TAILQ_FIRST(&sc->all_levels)) != NULL) { 50273347b07SNate Lawson TAILQ_REMOVE(&sc->all_levels, lev, link); 50373347b07SNate Lawson free(lev, M_TEMP); 50473347b07SNate Lawson } 50588c9b54cSNate Lawson while ((set_arr = TAILQ_FIRST(&rel_sets)) != NULL) { 50688c9b54cSNate Lawson TAILQ_REMOVE(&rel_sets, set_arr, link); 50788c9b54cSNate Lawson free(set_arr, M_TEMP); 50888c9b54cSNate Lawson } 50988c9b54cSNate Lawson sc->all_count = 0; 51073347b07SNate Lawson free(devs, M_TEMP); 51173347b07SNate Lawson free(sets, M_TEMP); 51273347b07SNate Lawson return (error); 51373347b07SNate Lawson } 51473347b07SNate Lawson 51573347b07SNate Lawson /* 51673347b07SNate Lawson * Create levels for an array of absolute settings and insert them in 51773347b07SNate Lawson * sorted order in the specified list. 51873347b07SNate Lawson */ 51973347b07SNate Lawson static int 52088c9b54cSNate Lawson cpufreq_insert_abs(struct cpufreq_softc *sc, struct cf_setting *sets, 52173347b07SNate Lawson int count) 52273347b07SNate Lawson { 52388c9b54cSNate Lawson struct cf_level_lst *list; 52473347b07SNate Lawson struct cf_level *level, *search; 52573347b07SNate Lawson int i; 52673347b07SNate Lawson 52788c9b54cSNate Lawson list = &sc->all_levels; 52873347b07SNate Lawson for (i = 0; i < count; i++) { 52973347b07SNate Lawson level = malloc(sizeof(*level), M_TEMP, M_NOWAIT | M_ZERO); 53073347b07SNate Lawson if (level == NULL) 53173347b07SNate Lawson return (ENOMEM); 53273347b07SNate Lawson level->abs_set = sets[i]; 53388c9b54cSNate Lawson level->total_set = sets[i]; 53488c9b54cSNate Lawson level->total_set.dev = NULL; 53588c9b54cSNate Lawson sc->all_count++; 53673347b07SNate Lawson 53773347b07SNate Lawson if (TAILQ_EMPTY(list)) { 53873347b07SNate Lawson TAILQ_INSERT_HEAD(list, level, link); 53973347b07SNate Lawson continue; 54073347b07SNate Lawson } 54173347b07SNate Lawson 54273347b07SNate Lawson TAILQ_FOREACH_REVERSE(search, list, cf_level_lst, link) { 54388c9b54cSNate Lawson if (sets[i].freq <= search->total_set.freq) { 54473347b07SNate Lawson TAILQ_INSERT_AFTER(list, search, level, link); 54573347b07SNate Lawson break; 54673347b07SNate Lawson } 54773347b07SNate Lawson } 54873347b07SNate Lawson } 54973347b07SNate Lawson return (0); 55073347b07SNate Lawson } 55173347b07SNate Lawson 55288c9b54cSNate Lawson /* 55388c9b54cSNate Lawson * Expand a group of relative settings, creating derived levels from them. 55488c9b54cSNate Lawson */ 55588c9b54cSNate Lawson static int 55688c9b54cSNate Lawson cpufreq_expand_set(struct cpufreq_softc *sc, struct cf_setting_array *set_arr) 55788c9b54cSNate Lawson { 55888c9b54cSNate Lawson struct cf_level *fill, *search; 55988c9b54cSNate Lawson struct cf_setting *set; 56088c9b54cSNate Lawson int i; 56188c9b54cSNate Lawson 56288c9b54cSNate Lawson TAILQ_FOREACH(search, &sc->all_levels, link) { 56388c9b54cSNate Lawson /* Skip this level if we've already modified it. */ 56488c9b54cSNate Lawson for (i = 0; i < search->rel_count; i++) { 56588c9b54cSNate Lawson if (search->rel_set[i].dev == set_arr->sets[0].dev) 56688c9b54cSNate Lawson break; 56788c9b54cSNate Lawson } 56888c9b54cSNate Lawson if (i != search->rel_count) 56988c9b54cSNate Lawson continue; 57088c9b54cSNate Lawson 57188c9b54cSNate Lawson /* Add each setting to the level, duplicating if necessary. */ 57288c9b54cSNate Lawson for (i = 0; i < set_arr->count; i++) { 57388c9b54cSNate Lawson set = &set_arr->sets[i]; 57488c9b54cSNate Lawson 57588c9b54cSNate Lawson /* 57688c9b54cSNate Lawson * If this setting is less than 100%, split the level 57788c9b54cSNate Lawson * into two and add this setting to the new level. 57888c9b54cSNate Lawson */ 57988c9b54cSNate Lawson fill = search; 58088c9b54cSNate Lawson if (set->freq < 10000) 58188c9b54cSNate Lawson fill = cpufreq_dup_set(sc, search, set); 58288c9b54cSNate Lawson 58388c9b54cSNate Lawson /* 58488c9b54cSNate Lawson * The new level was a duplicate of an existing level 58588c9b54cSNate Lawson * so we freed it. Go to the next setting. 58688c9b54cSNate Lawson */ 58788c9b54cSNate Lawson if (fill == NULL) 58888c9b54cSNate Lawson continue; 58988c9b54cSNate Lawson 59088c9b54cSNate Lawson /* Add this setting to the existing or new level. */ 59188c9b54cSNate Lawson KASSERT(fill->rel_count < MAX_SETTINGS, 59288c9b54cSNate Lawson ("cpufreq: too many relative drivers (%d)", 59388c9b54cSNate Lawson MAX_SETTINGS)); 59488c9b54cSNate Lawson fill->rel_set[fill->rel_count] = *set; 59588c9b54cSNate Lawson fill->rel_count++; 59688c9b54cSNate Lawson } 59788c9b54cSNate Lawson } 59888c9b54cSNate Lawson 59988c9b54cSNate Lawson return (0); 60088c9b54cSNate Lawson } 60188c9b54cSNate Lawson 60288c9b54cSNate Lawson static struct cf_level * 60388c9b54cSNate Lawson cpufreq_dup_set(struct cpufreq_softc *sc, struct cf_level *dup, 60488c9b54cSNate Lawson struct cf_setting *set) 60588c9b54cSNate Lawson { 60688c9b54cSNate Lawson struct cf_level_lst *list; 60788c9b54cSNate Lawson struct cf_level *fill, *itr; 60888c9b54cSNate Lawson struct cf_setting *fill_set, *itr_set; 60988c9b54cSNate Lawson int i; 61088c9b54cSNate Lawson 61188c9b54cSNate Lawson /* 61288c9b54cSNate Lawson * Create a new level, copy it from the old one, and update the 61388c9b54cSNate Lawson * total frequency and power by the percentage specified in the 61488c9b54cSNate Lawson * relative setting. 61588c9b54cSNate Lawson */ 61688c9b54cSNate Lawson fill = malloc(sizeof(*fill), M_TEMP, M_NOWAIT); 61788c9b54cSNate Lawson if (fill == NULL) 61888c9b54cSNate Lawson return (NULL); 61988c9b54cSNate Lawson *fill = *dup; 62088c9b54cSNate Lawson fill_set = &fill->total_set; 62188c9b54cSNate Lawson fill_set->freq = 62288c9b54cSNate Lawson ((uint64_t)fill_set->freq * set->freq) / 10000; 62388c9b54cSNate Lawson if (fill_set->power != CPUFREQ_VAL_UNKNOWN) { 62488c9b54cSNate Lawson fill_set->power = ((uint64_t)fill_set->power * set->freq) 62588c9b54cSNate Lawson / 10000; 62688c9b54cSNate Lawson } 62788c9b54cSNate Lawson if (set->lat != CPUFREQ_VAL_UNKNOWN) { 62888c9b54cSNate Lawson if (fill_set->lat != CPUFREQ_VAL_UNKNOWN) 62988c9b54cSNate Lawson fill_set->lat += set->lat; 63088c9b54cSNate Lawson else 63188c9b54cSNate Lawson fill_set->lat = set->lat; 63288c9b54cSNate Lawson } 63388c9b54cSNate Lawson 63488c9b54cSNate Lawson /* 63588c9b54cSNate Lawson * If we copied an old level that we already modified (say, at 100%), 63688c9b54cSNate Lawson * we need to remove that setting before adding this one. Since we 63788c9b54cSNate Lawson * process each setting array in order, we know any settings for this 63888c9b54cSNate Lawson * driver will be found at the end. 63988c9b54cSNate Lawson */ 64088c9b54cSNate Lawson for (i = fill->rel_count; i != 0; i--) { 64188c9b54cSNate Lawson if (fill->rel_set[i - 1].dev != set->dev) 64288c9b54cSNate Lawson break; 64388c9b54cSNate Lawson fill->rel_count--; 64488c9b54cSNate Lawson } 64588c9b54cSNate Lawson 64688c9b54cSNate Lawson /* 64788c9b54cSNate Lawson * Insert the new level in sorted order. If we find a duplicate, 64888c9b54cSNate Lawson * free the new level. We can do this since any existing level will 64988c9b54cSNate Lawson * be guaranteed to have the same or less settings and thus consume 65088c9b54cSNate Lawson * less power. For example, a level with one absolute setting of 65188c9b54cSNate Lawson * 800 Mhz uses less power than one composed of an absolute setting 65288c9b54cSNate Lawson * of 1600 Mhz and a relative setting at 50%. 65388c9b54cSNate Lawson */ 65488c9b54cSNate Lawson list = &sc->all_levels; 65588c9b54cSNate Lawson if (TAILQ_EMPTY(list)) { 65688c9b54cSNate Lawson TAILQ_INSERT_HEAD(list, fill, link); 65788c9b54cSNate Lawson } else { 65888c9b54cSNate Lawson TAILQ_FOREACH_REVERSE(itr, list, cf_level_lst, link) { 65988c9b54cSNate Lawson itr_set = &itr->total_set; 66088c9b54cSNate Lawson if (CPUFREQ_CMP(fill_set->freq, itr_set->freq)) { 66188c9b54cSNate Lawson free(fill, M_TEMP); 66288c9b54cSNate Lawson fill = NULL; 66388c9b54cSNate Lawson break; 66488c9b54cSNate Lawson } else if (fill_set->freq < itr_set->freq) { 66588c9b54cSNate Lawson TAILQ_INSERT_AFTER(list, itr, fill, link); 66688c9b54cSNate Lawson sc->all_count++; 66788c9b54cSNate Lawson break; 66888c9b54cSNate Lawson } 66988c9b54cSNate Lawson } 67088c9b54cSNate Lawson } 67188c9b54cSNate Lawson 67288c9b54cSNate Lawson return (fill); 67388c9b54cSNate Lawson } 67488c9b54cSNate Lawson 67573347b07SNate Lawson static int 67673347b07SNate Lawson cpufreq_curr_sysctl(SYSCTL_HANDLER_ARGS) 67773347b07SNate Lawson { 67873347b07SNate Lawson struct cpufreq_softc *sc; 67973347b07SNate Lawson struct cf_level *levels; 6800325089dSNate Lawson int count, devcount, error, freq, i, n; 6810325089dSNate Lawson device_t *devs; 68273347b07SNate Lawson 6830325089dSNate Lawson devs = NULL; 68473347b07SNate Lawson sc = oidp->oid_arg1; 6850325089dSNate Lawson levels = malloc(CF_MAX_LEVELS * sizeof(*levels), M_TEMP, M_NOWAIT); 68673347b07SNate Lawson if (levels == NULL) 68773347b07SNate Lawson return (ENOMEM); 68873347b07SNate Lawson 68973347b07SNate Lawson error = CPUFREQ_GET(sc->dev, &levels[0]); 69073347b07SNate Lawson if (error) 69173347b07SNate Lawson goto out; 69273347b07SNate Lawson freq = levels[0].total_set.freq; 69373347b07SNate Lawson error = sysctl_handle_int(oidp, &freq, 0, req); 69473347b07SNate Lawson if (error != 0 || req->newptr == NULL) 69573347b07SNate Lawson goto out; 69673347b07SNate Lawson 6970325089dSNate Lawson /* 6980325089dSNate Lawson * While we only call cpufreq_get() on one device (assuming all 6990325089dSNate Lawson * CPUs have equal levels), we call cpufreq_set() on all CPUs. 7000325089dSNate Lawson * This is needed for some MP systems. 7010325089dSNate Lawson */ 7020325089dSNate Lawson error = devclass_get_devices(cpufreq_dc, &devs, &devcount); 70373347b07SNate Lawson if (error) 70473347b07SNate Lawson goto out; 7050325089dSNate Lawson for (n = 0; n < devcount; n++) { 7060325089dSNate Lawson count = CF_MAX_LEVELS; 7070325089dSNate Lawson error = CPUFREQ_LEVELS(devs[n], levels, &count); 708d269386aSNate Lawson if (error) { 709d269386aSNate Lawson if (error == E2BIG) 710d269386aSNate Lawson printf( 711d269386aSNate Lawson "cpufreq: need to increase CF_MAX_LEVELS\n"); 7120325089dSNate Lawson break; 713d269386aSNate Lawson } 71473347b07SNate Lawson for (i = 0; i < count; i++) { 71573347b07SNate Lawson if (CPUFREQ_CMP(levels[i].total_set.freq, freq)) { 7160325089dSNate Lawson error = CPUFREQ_SET(devs[n], &levels[i], 71773347b07SNate Lawson CPUFREQ_PRIO_USER); 71873347b07SNate Lawson break; 71973347b07SNate Lawson } 72073347b07SNate Lawson } 7210325089dSNate Lawson if (i == count) { 72273347b07SNate Lawson error = EINVAL; 7230325089dSNate Lawson break; 7240325089dSNate Lawson } 7250325089dSNate Lawson } 72673347b07SNate Lawson 72773347b07SNate Lawson out: 7280325089dSNate Lawson if (devs) 7290325089dSNate Lawson free(devs, M_TEMP); 73073347b07SNate Lawson if (levels) 73173347b07SNate Lawson free(levels, M_TEMP); 73273347b07SNate Lawson return (error); 73373347b07SNate Lawson } 73473347b07SNate Lawson 73573347b07SNate Lawson static int 73673347b07SNate Lawson cpufreq_levels_sysctl(SYSCTL_HANDLER_ARGS) 73773347b07SNate Lawson { 73873347b07SNate Lawson struct cpufreq_softc *sc; 73973347b07SNate Lawson struct cf_level *levels; 74073347b07SNate Lawson struct cf_setting *set; 74173347b07SNate Lawson struct sbuf sb; 74273347b07SNate Lawson int count, error, i; 74373347b07SNate Lawson 74473347b07SNate Lawson sc = oidp->oid_arg1; 74573347b07SNate Lawson sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND); 74673347b07SNate Lawson 74773347b07SNate Lawson /* Get settings from the device and generate the output string. */ 74873347b07SNate Lawson count = CF_MAX_LEVELS; 74973347b07SNate Lawson levels = malloc(count * sizeof(*levels), M_TEMP, M_NOWAIT); 75073347b07SNate Lawson if (levels == NULL) 75173347b07SNate Lawson return (ENOMEM); 75273347b07SNate Lawson error = CPUFREQ_LEVELS(sc->dev, levels, &count); 753d269386aSNate Lawson if (error) { 754d269386aSNate Lawson if (error == E2BIG) 755d269386aSNate Lawson printf("cpufreq: need to increase CF_MAX_LEVELS\n"); 75673347b07SNate Lawson goto out; 757d269386aSNate Lawson } 75873347b07SNate Lawson if (count) { 75973347b07SNate Lawson for (i = 0; i < count; i++) { 76073347b07SNate Lawson set = &levels[i].total_set; 76173347b07SNate Lawson sbuf_printf(&sb, "%d/%d ", set->freq, set->power); 76273347b07SNate Lawson } 76373347b07SNate Lawson } else 76473347b07SNate Lawson sbuf_cpy(&sb, "0"); 76573347b07SNate Lawson sbuf_trim(&sb); 76673347b07SNate Lawson sbuf_finish(&sb); 76773347b07SNate Lawson error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req); 76873347b07SNate Lawson 76973347b07SNate Lawson out: 77073347b07SNate Lawson free(levels, M_TEMP); 77173347b07SNate Lawson sbuf_delete(&sb); 77273347b07SNate Lawson return (error); 77373347b07SNate Lawson } 77473347b07SNate Lawson 775e959a70bSNate Lawson static int 776e959a70bSNate Lawson cpufreq_settings_sysctl(SYSCTL_HANDLER_ARGS) 777e959a70bSNate Lawson { 778e959a70bSNate Lawson device_t dev; 779e959a70bSNate Lawson struct cf_setting *sets; 780e959a70bSNate Lawson struct sbuf sb; 781e959a70bSNate Lawson int error, i, set_count; 782e959a70bSNate Lawson 783e959a70bSNate Lawson dev = oidp->oid_arg1; 784e959a70bSNate Lawson sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND); 785e959a70bSNate Lawson 786e959a70bSNate Lawson /* Get settings from the device and generate the output string. */ 787e959a70bSNate Lawson set_count = MAX_SETTINGS; 788e959a70bSNate Lawson sets = malloc(set_count * sizeof(*sets), M_TEMP, M_NOWAIT); 789e959a70bSNate Lawson if (sets == NULL) 790e959a70bSNate Lawson return (ENOMEM); 791e959a70bSNate Lawson error = CPUFREQ_DRV_SETTINGS(dev, sets, &set_count); 792e959a70bSNate Lawson if (error) 793e959a70bSNate Lawson goto out; 794e959a70bSNate Lawson if (set_count) { 795e959a70bSNate Lawson for (i = 0; i < set_count; i++) 796e959a70bSNate Lawson sbuf_printf(&sb, "%d/%d ", sets[i].freq, sets[i].power); 797e959a70bSNate Lawson } else 798e959a70bSNate Lawson sbuf_cpy(&sb, "0"); 799e959a70bSNate Lawson sbuf_trim(&sb); 800e959a70bSNate Lawson sbuf_finish(&sb); 801e959a70bSNate Lawson error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req); 802e959a70bSNate Lawson 803e959a70bSNate Lawson out: 804e959a70bSNate Lawson free(sets, M_TEMP); 805e959a70bSNate Lawson sbuf_delete(&sb); 806e959a70bSNate Lawson return (error); 807e959a70bSNate Lawson } 808e959a70bSNate Lawson 80973347b07SNate Lawson int 81073347b07SNate Lawson cpufreq_register(device_t dev) 81173347b07SNate Lawson { 81267c8649fSNate Lawson struct cpufreq_softc *sc; 81373347b07SNate Lawson device_t cf_dev, cpu_dev; 81473347b07SNate Lawson 815e959a70bSNate Lawson /* Add a sysctl to get each driver's settings separately. */ 816e959a70bSNate Lawson SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev), 817e959a70bSNate Lawson SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), 818e959a70bSNate Lawson OID_AUTO, "freq_settings", CTLTYPE_STRING | CTLFLAG_RD, dev, 0, 819e959a70bSNate Lawson cpufreq_settings_sysctl, "A", "CPU frequency driver settings"); 820e959a70bSNate Lawson 82173347b07SNate Lawson /* 8220325089dSNate Lawson * Add only one cpufreq device to each CPU. Currently, all CPUs 8230325089dSNate Lawson * must offer the same levels and be switched at the same time. 82473347b07SNate Lawson */ 8250325089dSNate Lawson cpu_dev = device_get_parent(dev); 82667c8649fSNate Lawson if ((cf_dev = device_find_child(cpu_dev, "cpufreq", -1))) { 82767c8649fSNate Lawson sc = device_get_softc(cf_dev); 82867c8649fSNate Lawson sc->max_mhz = CPUFREQ_VAL_UNKNOWN; 82973347b07SNate Lawson return (0); 83067c8649fSNate Lawson } 83173347b07SNate Lawson 8320325089dSNate Lawson /* Add the child device and possibly sysctls. */ 8330325089dSNate Lawson cf_dev = BUS_ADD_CHILD(cpu_dev, 0, "cpufreq", -1); 83473347b07SNate Lawson if (cf_dev == NULL) 83573347b07SNate Lawson return (ENOMEM); 83673347b07SNate Lawson device_quiet(cf_dev); 83773347b07SNate Lawson 83873347b07SNate Lawson return (device_probe_and_attach(cf_dev)); 83973347b07SNate Lawson } 84073347b07SNate Lawson 84173347b07SNate Lawson int 84273347b07SNate Lawson cpufreq_unregister(device_t dev) 84373347b07SNate Lawson { 84473347b07SNate Lawson device_t cf_dev, *devs; 845e94a0c1aSNate Lawson int cfcount, devcount, error, i, type; 84673347b07SNate Lawson 84773347b07SNate Lawson /* 84873347b07SNate Lawson * If this is the last cpufreq child device, remove the control 84973347b07SNate Lawson * device as well. We identify cpufreq children by calling a method 85073347b07SNate Lawson * they support. 85173347b07SNate Lawson */ 85273347b07SNate Lawson error = device_get_children(device_get_parent(dev), &devs, &devcount); 85373347b07SNate Lawson if (error) 85473347b07SNate Lawson return (error); 85567c8649fSNate Lawson cf_dev = device_find_child(device_get_parent(dev), "cpufreq", -1); 85673347b07SNate Lawson cfcount = 0; 85773347b07SNate Lawson for (i = 0; i < devcount; i++) { 85873347b07SNate Lawson if (!device_is_attached(devs[i])) 85973347b07SNate Lawson continue; 860e94a0c1aSNate Lawson if (CPUFREQ_DRV_TYPE(devs[i], &type) == 0) 86173347b07SNate Lawson cfcount++; 86273347b07SNate Lawson } 8630325089dSNate Lawson if (cfcount <= 1) 86473347b07SNate Lawson device_delete_child(device_get_parent(cf_dev), cf_dev); 86573347b07SNate Lawson free(devs, M_TEMP); 86673347b07SNate Lawson 86773347b07SNate Lawson return (0); 86873347b07SNate Lawson } 869