2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2004-2007 Nate Lawson (SDG)
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
35 #include <sys/eventhandler.h>
36 #include <sys/kernel.h>
38 #include <sys/malloc.h>
39 #include <sys/module.h>
41 #include <sys/queue.h>
43 #include <sys/sched.h>
45 #include <sys/sysctl.h>
46 #include <sys/systm.h>
48 #include <sys/timetc.h>
49 #include <sys/taskqueue.h>
51 #include "cpufreq_if.h"
54 * Common CPU frequency glue code. Drivers for specific hardware can
55 * attach this interface to allow users to get/set the CPU frequency.
59 * Number of levels we can handle. Levels are synthesized from settings
60 * so for M settings and N drivers, there may be M*N levels.
62 #define CF_MAX_LEVELS 64
64 struct cf_saved_freq {
65 struct cf_level level;
67 SLIST_ENTRY(cf_saved_freq) link;
70 struct cpufreq_softc {
72 struct cf_level curr_level;
74 SLIST_HEAD(, cf_saved_freq) saved_freq;
75 struct cf_level_lst all_levels;
79 struct sysctl_ctx_list sysctl_ctx;
80 struct task startup_task;
81 struct cf_level *levels_buf;
84 struct cf_setting_array {
85 struct cf_setting sets[MAX_SETTINGS];
87 TAILQ_ENTRY(cf_setting_array) link;
90 TAILQ_HEAD(cf_setting_lst, cf_setting_array);
92 #define CF_MTX_INIT(x) sx_init((x), "cpufreq lock")
93 #define CF_MTX_LOCK(x) sx_xlock((x))
94 #define CF_MTX_UNLOCK(x) sx_xunlock((x))
95 #define CF_MTX_ASSERT(x) sx_assert((x), SX_XLOCKED)
97 #define CF_DEBUG(msg...) do { \
99 printf("cpufreq: " msg); \
102 static int cpufreq_attach(device_t dev);
103 static void cpufreq_startup_task(void *ctx, int pending);
104 static int cpufreq_detach(device_t dev);
105 static int cf_set_method(device_t dev, const struct cf_level *level,
107 static int cf_get_method(device_t dev, struct cf_level *level);
108 static int cf_levels_method(device_t dev, struct cf_level *levels,
110 static int cpufreq_insert_abs(struct cpufreq_softc *sc,
111 struct cf_setting *sets, int count);
112 static int cpufreq_expand_set(struct cpufreq_softc *sc,
113 struct cf_setting_array *set_arr);
114 static struct cf_level *cpufreq_dup_set(struct cpufreq_softc *sc,
115 struct cf_level *dup, struct cf_setting *set);
116 static int cpufreq_curr_sysctl(SYSCTL_HANDLER_ARGS);
117 static int cpufreq_levels_sysctl(SYSCTL_HANDLER_ARGS);
118 static int cpufreq_settings_sysctl(SYSCTL_HANDLER_ARGS);
120 static device_method_t cpufreq_methods[] = {
121 DEVMETHOD(device_probe, bus_generic_probe),
122 DEVMETHOD(device_attach, cpufreq_attach),
123 DEVMETHOD(device_detach, cpufreq_detach),
125 DEVMETHOD(cpufreq_set, cf_set_method),
126 DEVMETHOD(cpufreq_get, cf_get_method),
127 DEVMETHOD(cpufreq_levels, cf_levels_method),
130 static driver_t cpufreq_driver = {
131 "cpufreq", cpufreq_methods, sizeof(struct cpufreq_softc)
133 static devclass_t cpufreq_dc;
134 DRIVER_MODULE(cpufreq, cpu, cpufreq_driver, cpufreq_dc, 0, 0);
136 static int cf_lowest_freq;
137 static int cf_verbose;
138 static SYSCTL_NODE(_debug, OID_AUTO, cpufreq, CTLFLAG_RD, NULL,
139 "cpufreq debugging");
140 SYSCTL_INT(_debug_cpufreq, OID_AUTO, lowest, CTLFLAG_RWTUN, &cf_lowest_freq, 1,
141 "Don't provide levels below this frequency.");
142 SYSCTL_INT(_debug_cpufreq, OID_AUTO, verbose, CTLFLAG_RWTUN, &cf_verbose, 1,
143 "Print verbose debugging messages");
146 cpufreq_attach(device_t dev)
148 struct cpufreq_softc *sc;
154 CF_DEBUG("initializing %s\n", device_get_nameunit(dev));
155 sc = device_get_softc(dev);
156 parent = device_get_parent(dev);
158 sysctl_ctx_init(&sc->sysctl_ctx);
159 TAILQ_INIT(&sc->all_levels);
160 CF_MTX_INIT(&sc->lock);
161 sc->curr_level.total_set.freq = CPUFREQ_VAL_UNKNOWN;
162 SLIST_INIT(&sc->saved_freq);
163 /* Try to get nominal CPU freq to use it as maximum later if needed */
164 sc->max_mhz = cpu_get_nominal_mhz(dev);
165 /* If that fails, try to measure the current rate */
166 if (sc->max_mhz <= 0) {
167 pc = cpu_get_pcpu(dev);
168 if (cpu_est_clockrate(pc->pc_cpuid, &rate) == 0)
169 sc->max_mhz = rate / 1000000;
171 sc->max_mhz = CPUFREQ_VAL_UNKNOWN;
175 * Only initialize one set of sysctls for all CPUs. In the future,
176 * if multiple CPUs can have different settings, we can move these
177 * sysctls to be under every CPU instead of just the first one.
179 numdevs = devclass_get_count(cpufreq_dc);
183 CF_DEBUG("initializing one-time data for %s\n",
184 device_get_nameunit(dev));
185 sc->levels_buf = malloc(CF_MAX_LEVELS * sizeof(*sc->levels_buf),
187 SYSCTL_ADD_PROC(&sc->sysctl_ctx,
188 SYSCTL_CHILDREN(device_get_sysctl_tree(parent)),
189 OID_AUTO, "freq", CTLTYPE_INT | CTLFLAG_RW, sc, 0,
190 cpufreq_curr_sysctl, "I", "Current CPU frequency");
191 SYSCTL_ADD_PROC(&sc->sysctl_ctx,
192 SYSCTL_CHILDREN(device_get_sysctl_tree(parent)),
193 OID_AUTO, "freq_levels", CTLTYPE_STRING | CTLFLAG_RD, sc, 0,
194 cpufreq_levels_sysctl, "A", "CPU frequency levels");
197 * Queue a one-shot broadcast that levels have changed.
198 * It will run once the system has completed booting.
200 TASK_INIT(&sc->startup_task, 0, cpufreq_startup_task, dev);
201 taskqueue_enqueue(taskqueue_thread, &sc->startup_task);
206 /* Handle any work to be done for all drivers that attached during boot. */
208 cpufreq_startup_task(void *ctx, int pending)
211 cpufreq_settings_changed((device_t)ctx);
215 cpufreq_detach(device_t dev)
217 struct cpufreq_softc *sc;
218 struct cf_saved_freq *saved_freq;
221 CF_DEBUG("shutdown %s\n", device_get_nameunit(dev));
222 sc = device_get_softc(dev);
223 sysctl_ctx_free(&sc->sysctl_ctx);
225 while ((saved_freq = SLIST_FIRST(&sc->saved_freq)) != NULL) {
226 SLIST_REMOVE_HEAD(&sc->saved_freq, link);
227 free(saved_freq, M_TEMP);
230 /* Only clean up these resources when the last device is detaching. */
231 numdevs = devclass_get_count(cpufreq_dc);
233 CF_DEBUG("final shutdown for %s\n", device_get_nameunit(dev));
234 free(sc->levels_buf, M_DEVBUF);
241 cf_set_method(device_t dev, const struct cf_level *level, int priority)
243 struct cpufreq_softc *sc;
244 const struct cf_setting *set;
245 struct cf_saved_freq *saved_freq, *curr_freq;
250 sc = device_get_softc(dev);
255 /* We are going to change levels so notify the pre-change handler. */
256 EVENTHANDLER_INVOKE(cpufreq_pre_change, level, &error);
258 EVENTHANDLER_INVOKE(cpufreq_post_change, level, error);
262 CF_MTX_LOCK(&sc->lock);
265 #ifdef EARLY_AP_STARTUP
266 MPASS(mp_ncpus == 1 || smp_started);
269 * If still booting and secondary CPUs not started yet, don't allow
270 * changing the frequency until they're online. This is because we
271 * can't switch to them using sched_bind() and thus we'd only be
272 * switching the main CPU. XXXTODO: Need to think more about how to
273 * handle having different CPUs at different frequencies.
275 if (mp_ncpus > 1 && !smp_started) {
276 device_printf(dev, "rejecting change, SMP not started yet\n");
284 * If the requested level has a lower priority, don't allow
285 * the new level right now.
287 if (priority < sc->curr_priority) {
288 CF_DEBUG("ignoring, curr prio %d less than %d\n", priority,
295 * If the caller didn't specify a level and one is saved, prepare to
296 * restore the saved level. If none has been saved, return an error.
299 saved_freq = SLIST_FIRST(&sc->saved_freq);
300 if (saved_freq == NULL) {
301 CF_DEBUG("NULL level, no saved level\n");
305 level = &saved_freq->level;
306 priority = saved_freq->priority;
307 CF_DEBUG("restoring saved level, freq %d prio %d\n",
308 level->total_set.freq, priority);
311 /* Reject levels that are below our specified threshold. */
312 if (level->total_set.freq < cf_lowest_freq) {
313 CF_DEBUG("rejecting freq %d, less than %d limit\n",
314 level->total_set.freq, cf_lowest_freq);
319 /* If already at this level, just return. */
320 if (sc->curr_level.total_set.freq == level->total_set.freq) {
321 CF_DEBUG("skipping freq %d, same as current level %d\n",
322 level->total_set.freq, sc->curr_level.total_set.freq);
326 /* First, set the absolute frequency via its driver. */
327 set = &level->abs_set;
329 if (!device_is_attached(set->dev)) {
334 /* Bind to the target CPU before switching. */
335 pc = cpu_get_pcpu(set->dev);
336 thread_lock(curthread);
337 pri = curthread->td_priority;
338 sched_prio(curthread, PRI_MIN);
339 sched_bind(curthread, pc->pc_cpuid);
340 thread_unlock(curthread);
341 CF_DEBUG("setting abs freq %d on %s (cpu %d)\n", set->freq,
342 device_get_nameunit(set->dev), PCPU_GET(cpuid));
343 error = CPUFREQ_DRV_SET(set->dev, set);
344 thread_lock(curthread);
345 sched_unbind(curthread);
346 sched_prio(curthread, pri);
347 thread_unlock(curthread);
353 /* Next, set any/all relative frequencies via their drivers. */
354 for (i = 0; i < level->rel_count; i++) {
355 set = &level->rel_set[i];
356 if (!device_is_attached(set->dev)) {
361 /* Bind to the target CPU before switching. */
362 pc = cpu_get_pcpu(set->dev);
363 thread_lock(curthread);
364 pri = curthread->td_priority;
365 sched_prio(curthread, PRI_MIN);
366 sched_bind(curthread, pc->pc_cpuid);
367 thread_unlock(curthread);
368 CF_DEBUG("setting rel freq %d on %s (cpu %d)\n", set->freq,
369 device_get_nameunit(set->dev), PCPU_GET(cpuid));
370 error = CPUFREQ_DRV_SET(set->dev, set);
371 thread_lock(curthread);
372 sched_unbind(curthread);
373 sched_prio(curthread, pri);
374 thread_unlock(curthread);
376 /* XXX Back out any successful setting? */
383 * Before recording the current level, check if we're going to a
384 * higher priority. If so, save the previous level and priority.
386 if (sc->curr_level.total_set.freq != CPUFREQ_VAL_UNKNOWN &&
387 priority > sc->curr_priority) {
388 CF_DEBUG("saving level, freq %d prio %d\n",
389 sc->curr_level.total_set.freq, sc->curr_priority);
390 curr_freq = malloc(sizeof(*curr_freq), M_TEMP, M_NOWAIT);
391 if (curr_freq == NULL) {
395 curr_freq->level = sc->curr_level;
396 curr_freq->priority = sc->curr_priority;
397 SLIST_INSERT_HEAD(&sc->saved_freq, curr_freq, link);
399 sc->curr_level = *level;
400 sc->curr_priority = priority;
402 /* If we were restoring a saved state, reset it to "unused". */
403 if (saved_freq != NULL) {
404 CF_DEBUG("resetting saved level\n");
405 sc->curr_level.total_set.freq = CPUFREQ_VAL_UNKNOWN;
406 SLIST_REMOVE_HEAD(&sc->saved_freq, link);
407 free(saved_freq, M_TEMP);
411 CF_MTX_UNLOCK(&sc->lock);
414 * We changed levels (or attempted to) so notify the post-change
415 * handler of new frequency or error.
417 EVENTHANDLER_INVOKE(cpufreq_post_change, level, error);
419 device_printf(set->dev, "set freq failed, err %d\n", error);
425 cf_get_method(device_t dev, struct cf_level *level)
427 struct cpufreq_softc *sc;
428 struct cf_level *levels;
429 struct cf_setting *curr_set, set;
432 int bdiff, count, diff, error, i, n, numdevs;
435 sc = device_get_softc(dev);
439 /* If we already know the current frequency, we're done. */
440 CF_MTX_LOCK(&sc->lock);
441 curr_set = &sc->curr_level.total_set;
442 if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) {
443 CF_DEBUG("get returning known freq %d\n", curr_set->freq);
446 CF_MTX_UNLOCK(&sc->lock);
449 * We need to figure out the current level. Loop through every
450 * driver, getting the current setting. Then, attempt to get a best
451 * match of settings against each level.
453 count = CF_MAX_LEVELS;
454 levels = malloc(count * sizeof(*levels), M_TEMP, M_NOWAIT);
457 error = CPUFREQ_LEVELS(sc->dev, levels, &count);
460 printf("cpufreq: need to increase CF_MAX_LEVELS\n");
461 free(levels, M_TEMP);
464 error = device_get_children(device_get_parent(dev), &devs, &numdevs);
466 free(levels, M_TEMP);
471 * Reacquire the lock and search for the given level.
473 * XXX Note: this is not quite right since we really need to go
474 * through each level and compare both absolute and relative
475 * settings for each driver in the system before making a match.
476 * The estimation code below catches this case though.
478 CF_MTX_LOCK(&sc->lock);
479 for (n = 0; n < numdevs && curr_set->freq == CPUFREQ_VAL_UNKNOWN; n++) {
480 if (!device_is_attached(devs[n]))
482 if (CPUFREQ_DRV_GET(devs[n], &set) != 0)
484 for (i = 0; i < count; i++) {
485 if (set.freq == levels[i].total_set.freq) {
486 sc->curr_level = levels[i];
492 if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) {
493 CF_DEBUG("get matched freq %d from drivers\n", curr_set->freq);
498 * We couldn't find an exact match, so attempt to estimate and then
499 * match against a level.
501 pc = cpu_get_pcpu(dev);
506 cpu_est_clockrate(pc->pc_cpuid, &rate);
509 for (i = 0; i < count; i++) {
510 diff = abs(levels[i].total_set.freq - rate);
513 sc->curr_level = levels[i];
516 CF_DEBUG("get estimated freq %d\n", curr_set->freq);
520 *level = sc->curr_level;
522 CF_MTX_UNLOCK(&sc->lock);
524 free(levels, M_TEMP);
529 cf_levels_method(device_t dev, struct cf_level *levels, int *count)
531 struct cf_setting_array *set_arr;
532 struct cf_setting_lst rel_sets;
533 struct cpufreq_softc *sc;
534 struct cf_level *lev;
535 struct cf_setting *sets;
538 int error, i, numdevs, set_count, type;
541 if (levels == NULL || count == NULL)
544 TAILQ_INIT(&rel_sets);
545 sc = device_get_softc(dev);
546 error = device_get_children(device_get_parent(dev), &devs, &numdevs);
549 sets = malloc(MAX_SETTINGS * sizeof(*sets), M_TEMP, M_NOWAIT);
555 /* Get settings from all cpufreq drivers. */
556 CF_MTX_LOCK(&sc->lock);
557 for (i = 0; i < numdevs; i++) {
558 /* Skip devices that aren't ready. */
559 if (!device_is_attached(devs[i]))
563 * Get settings, skipping drivers that offer no settings or
564 * provide settings for informational purposes only.
566 error = CPUFREQ_DRV_TYPE(devs[i], &type);
567 if (error || (type & CPUFREQ_FLAG_INFO_ONLY)) {
569 CF_DEBUG("skipping info-only driver %s\n",
570 device_get_nameunit(devs[i]));
574 set_count = MAX_SETTINGS;
575 error = CPUFREQ_DRV_SETTINGS(devs[i], sets, &set_count);
576 if (error || set_count == 0)
579 /* Add the settings to our absolute/relative lists. */
580 switch (type & CPUFREQ_TYPE_MASK) {
581 case CPUFREQ_TYPE_ABSOLUTE:
582 error = cpufreq_insert_abs(sc, sets, set_count);
584 case CPUFREQ_TYPE_RELATIVE:
585 CF_DEBUG("adding %d relative settings\n", set_count);
586 set_arr = malloc(sizeof(*set_arr), M_TEMP, M_NOWAIT);
587 if (set_arr == NULL) {
591 bcopy(sets, set_arr->sets, set_count * sizeof(*sets));
592 set_arr->count = set_count;
593 TAILQ_INSERT_TAIL(&rel_sets, set_arr, link);
603 * If there are no absolute levels, create a fake one at 100%. We
604 * then cache the clockrate for later use as our base frequency.
606 if (TAILQ_EMPTY(&sc->all_levels)) {
607 if (sc->max_mhz == CPUFREQ_VAL_UNKNOWN) {
608 sc->max_mhz = cpu_get_nominal_mhz(dev);
610 * If the CPU can't report a rate for 100%, hope
611 * the CPU is running at its nominal rate right now,
612 * and use that instead.
614 if (sc->max_mhz <= 0) {
615 pc = cpu_get_pcpu(dev);
616 cpu_est_clockrate(pc->pc_cpuid, &rate);
617 sc->max_mhz = rate / 1000000;
620 memset(&sets[0], CPUFREQ_VAL_UNKNOWN, sizeof(*sets));
621 sets[0].freq = sc->max_mhz;
623 error = cpufreq_insert_abs(sc, sets, 1);
628 /* Create a combined list of absolute + relative levels. */
629 TAILQ_FOREACH(set_arr, &rel_sets, link)
630 cpufreq_expand_set(sc, set_arr);
632 /* If the caller doesn't have enough space, return the actual count. */
633 if (sc->all_count > *count) {
634 *count = sc->all_count;
639 /* Finally, output the list of levels. */
641 TAILQ_FOREACH(lev, &sc->all_levels, link) {
643 /* Skip levels that have a frequency that is too low. */
644 if (lev->total_set.freq < cf_lowest_freq) {
652 *count = sc->all_count;
656 /* Clear all levels since we regenerate them each time. */
657 while ((lev = TAILQ_FIRST(&sc->all_levels)) != NULL) {
658 TAILQ_REMOVE(&sc->all_levels, lev, link);
663 CF_MTX_UNLOCK(&sc->lock);
664 while ((set_arr = TAILQ_FIRST(&rel_sets)) != NULL) {
665 TAILQ_REMOVE(&rel_sets, set_arr, link);
666 free(set_arr, M_TEMP);
674 * Create levels for an array of absolute settings and insert them in
675 * sorted order in the specified list.
678 cpufreq_insert_abs(struct cpufreq_softc *sc, struct cf_setting *sets,
681 struct cf_level_lst *list;
682 struct cf_level *level, *search;
685 CF_MTX_ASSERT(&sc->lock);
687 list = &sc->all_levels;
688 for (i = 0; i < count; i++) {
689 level = malloc(sizeof(*level), M_TEMP, M_NOWAIT | M_ZERO);
692 level->abs_set = sets[i];
693 level->total_set = sets[i];
694 level->total_set.dev = NULL;
697 if (TAILQ_EMPTY(list)) {
698 CF_DEBUG("adding abs setting %d at head\n",
700 TAILQ_INSERT_HEAD(list, level, link);
704 TAILQ_FOREACH_REVERSE(search, list, cf_level_lst, link) {
705 if (sets[i].freq <= search->total_set.freq) {
706 CF_DEBUG("adding abs setting %d after %d\n",
707 sets[i].freq, search->total_set.freq);
708 TAILQ_INSERT_AFTER(list, search, level, link);
717 * Expand a group of relative settings, creating derived levels from them.
720 cpufreq_expand_set(struct cpufreq_softc *sc, struct cf_setting_array *set_arr)
722 struct cf_level *fill, *search;
723 struct cf_setting *set;
726 CF_MTX_ASSERT(&sc->lock);
729 * Walk the set of all existing levels in reverse. This is so we
730 * create derived states from the lowest absolute settings first
731 * and discard duplicates created from higher absolute settings.
732 * For instance, a level of 50 Mhz derived from 100 Mhz + 50% is
733 * preferable to 200 Mhz + 25% because absolute settings are more
734 * efficient since they often change the voltage as well.
736 TAILQ_FOREACH_REVERSE(search, &sc->all_levels, cf_level_lst, link) {
737 /* Add each setting to the level, duplicating if necessary. */
738 for (i = 0; i < set_arr->count; i++) {
739 set = &set_arr->sets[i];
742 * If this setting is less than 100%, split the level
743 * into two and add this setting to the new level.
746 if (set->freq < 10000) {
747 fill = cpufreq_dup_set(sc, search, set);
750 * The new level was a duplicate of an existing
751 * level or its absolute setting is too high
752 * so we freed it. For example, we discard a
753 * derived level of 1000 MHz/25% if a level
754 * of 500 MHz/100% already exists.
760 /* Add this setting to the existing or new level. */
761 KASSERT(fill->rel_count < MAX_SETTINGS,
762 ("cpufreq: too many relative drivers (%d)",
764 fill->rel_set[fill->rel_count] = *set;
767 "expand set added rel setting %d%% to %d level\n",
768 set->freq / 100, fill->total_set.freq);
775 static struct cf_level *
776 cpufreq_dup_set(struct cpufreq_softc *sc, struct cf_level *dup,
777 struct cf_setting *set)
779 struct cf_level_lst *list;
780 struct cf_level *fill, *itr;
781 struct cf_setting *fill_set, *itr_set;
784 CF_MTX_ASSERT(&sc->lock);
787 * Create a new level, copy it from the old one, and update the
788 * total frequency and power by the percentage specified in the
791 fill = malloc(sizeof(*fill), M_TEMP, M_NOWAIT);
795 fill_set = &fill->total_set;
797 ((uint64_t)fill_set->freq * set->freq) / 10000;
798 if (fill_set->power != CPUFREQ_VAL_UNKNOWN) {
799 fill_set->power = ((uint64_t)fill_set->power * set->freq)
802 if (set->lat != CPUFREQ_VAL_UNKNOWN) {
803 if (fill_set->lat != CPUFREQ_VAL_UNKNOWN)
804 fill_set->lat += set->lat;
806 fill_set->lat = set->lat;
808 CF_DEBUG("dup set considering derived setting %d\n", fill_set->freq);
811 * If we copied an old level that we already modified (say, at 100%),
812 * we need to remove that setting before adding this one. Since we
813 * process each setting array in order, we know any settings for this
814 * driver will be found at the end.
816 for (i = fill->rel_count; i != 0; i--) {
817 if (fill->rel_set[i - 1].dev != set->dev)
819 CF_DEBUG("removed last relative driver: %s\n",
820 device_get_nameunit(set->dev));
825 * Insert the new level in sorted order. If it is a duplicate of an
826 * existing level (1) or has an absolute setting higher than the
827 * existing level (2), do not add it. We can do this since any such
828 * level is guaranteed use less power. For example (1), a level with
829 * one absolute setting of 800 Mhz uses less power than one composed
830 * of an absolute setting of 1600 Mhz and a relative setting at 50%.
831 * Also for example (2), a level of 800 Mhz/75% is preferable to
832 * 1600 Mhz/25% even though the latter has a lower total frequency.
834 list = &sc->all_levels;
835 KASSERT(!TAILQ_EMPTY(list), ("all levels list empty in dup set"));
836 TAILQ_FOREACH_REVERSE(itr, list, cf_level_lst, link) {
837 itr_set = &itr->total_set;
838 if (CPUFREQ_CMP(fill_set->freq, itr_set->freq)) {
839 CF_DEBUG("dup set rejecting %d (dupe)\n",
843 } else if (fill_set->freq < itr_set->freq) {
844 if (fill->abs_set.freq <= itr->abs_set.freq) {
846 "dup done, inserting new level %d after %d\n",
847 fill_set->freq, itr_set->freq);
848 TAILQ_INSERT_AFTER(list, itr, fill, link);
851 CF_DEBUG("dup set rejecting %d (abs too big)\n",
859 /* We didn't find a good place for this new level so free it. */
861 CF_DEBUG("dup set freeing new level %d (not optimal)\n",
871 cpufreq_curr_sysctl(SYSCTL_HANDLER_ARGS)
873 struct cpufreq_softc *sc;
874 struct cf_level *levels;
875 int best, count, diff, bdiff, devcount, error, freq, i, n;
880 levels = sc->levels_buf;
882 error = CPUFREQ_GET(sc->dev, &levels[0]);
885 freq = levels[0].total_set.freq;
886 error = sysctl_handle_int(oidp, &freq, 0, req);
887 if (error != 0 || req->newptr == NULL)
891 * While we only call cpufreq_get() on one device (assuming all
892 * CPUs have equal levels), we call cpufreq_set() on all CPUs.
893 * This is needed for some MP systems.
895 error = devclass_get_devices(cpufreq_dc, &devs, &devcount);
898 for (n = 0; n < devcount; n++) {
899 count = CF_MAX_LEVELS;
900 error = CPUFREQ_LEVELS(devs[n], levels, &count);
904 "cpufreq: need to increase CF_MAX_LEVELS\n");
909 for (i = 0; i < count; i++) {
910 diff = abs(levels[i].total_set.freq - freq);
916 error = CPUFREQ_SET(devs[n], &levels[best], CPUFREQ_PRIO_USER);
926 cpufreq_levels_sysctl(SYSCTL_HANDLER_ARGS)
928 struct cpufreq_softc *sc;
929 struct cf_level *levels;
930 struct cf_setting *set;
935 sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND);
937 /* Get settings from the device and generate the output string. */
938 count = CF_MAX_LEVELS;
939 levels = sc->levels_buf;
940 if (levels == NULL) {
944 error = CPUFREQ_LEVELS(sc->dev, levels, &count);
947 printf("cpufreq: need to increase CF_MAX_LEVELS\n");
951 for (i = 0; i < count; i++) {
952 set = &levels[i].total_set;
953 sbuf_printf(&sb, "%d/%d ", set->freq, set->power);
959 error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req);
967 cpufreq_settings_sysctl(SYSCTL_HANDLER_ARGS)
970 struct cf_setting *sets;
972 int error, i, set_count;
974 dev = oidp->oid_arg1;
975 sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND);
977 /* Get settings from the device and generate the output string. */
978 set_count = MAX_SETTINGS;
979 sets = malloc(set_count * sizeof(*sets), M_TEMP, M_NOWAIT);
984 error = CPUFREQ_DRV_SETTINGS(dev, sets, &set_count);
988 for (i = 0; i < set_count; i++)
989 sbuf_printf(&sb, "%d/%d ", sets[i].freq, sets[i].power);
994 error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req);
1003 cpufreq_register(device_t dev)
1005 struct cpufreq_softc *sc;
1006 device_t cf_dev, cpu_dev;
1008 /* Add a sysctl to get each driver's settings separately. */
1009 SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
1010 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
1011 OID_AUTO, "freq_settings", CTLTYPE_STRING | CTLFLAG_RD, dev, 0,
1012 cpufreq_settings_sysctl, "A", "CPU frequency driver settings");
1015 * Add only one cpufreq device to each CPU. Currently, all CPUs
1016 * must offer the same levels and be switched at the same time.
1018 cpu_dev = device_get_parent(dev);
1019 if ((cf_dev = device_find_child(cpu_dev, "cpufreq", -1))) {
1020 sc = device_get_softc(cf_dev);
1021 sc->max_mhz = CPUFREQ_VAL_UNKNOWN;
1025 /* Add the child device and possibly sysctls. */
1026 cf_dev = BUS_ADD_CHILD(cpu_dev, 0, "cpufreq", -1);
1029 device_quiet(cf_dev);
1031 return (device_probe_and_attach(cf_dev));
1035 cpufreq_unregister(device_t dev)
1037 device_t cf_dev, *devs;
1038 int cfcount, devcount, error, i, type;
1041 * If this is the last cpufreq child device, remove the control
1042 * device as well. We identify cpufreq children by calling a method
1045 error = device_get_children(device_get_parent(dev), &devs, &devcount);
1048 cf_dev = device_find_child(device_get_parent(dev), "cpufreq", -1);
1049 if (cf_dev == NULL) {
1051 "warning: cpufreq_unregister called with no cpufreq device active\n");
1056 for (i = 0; i < devcount; i++) {
1057 if (!device_is_attached(devs[i]))
1059 if (CPUFREQ_DRV_TYPE(devs[i], &type) == 0)
1063 device_delete_child(device_get_parent(cf_dev), cf_dev);
1070 cpufreq_settings_changed(device_t dev)
1073 EVENTHANDLER_INVOKE(cpufreq_levels_changed,
1074 device_get_unit(device_get_parent(dev)));