29
30#include <sys/param.h>
31#include <sys/bus.h>
32#include <sys/cpu.h>
33#include <sys/eventhandler.h>
34#include <sys/kernel.h>
35#include <sys/lock.h>
36#include <sys/malloc.h>
37#include <sys/module.h>
38#include <sys/proc.h>
39#include <sys/queue.h>
40#include <sys/sched.h>
41#include <sys/sysctl.h>
42#include <sys/systm.h>
43#include <sys/sbuf.h>
44#include <sys/sx.h>
45#include <sys/timetc.h>
46
47#include "cpufreq_if.h"
48
49/*
50 * Common CPU frequency glue code. Drivers for specific hardware can
51 * attach this interface to allow users to get/set the CPU frequency.
52 */
53
54/*
55 * Number of levels we can handle. Levels are synthesized from settings
56 * so for M settings and N drivers, there may be M*N levels.
57 */
58#define CF_MAX_LEVELS 64
59
60struct cpufreq_softc {
61 struct sx lock;
62 struct cf_level curr_level;
63 int curr_priority;
64 struct cf_level saved_level;
65 int saved_priority;
66 struct cf_level_lst all_levels;
67 int all_count;
68 int max_mhz;
69 device_t dev;
70 struct sysctl_ctx_list sysctl_ctx;
71};
72
73struct cf_setting_array {
74 struct cf_setting sets[MAX_SETTINGS];
75 int count;
76 TAILQ_ENTRY(cf_setting_array) link;
77};
78
79TAILQ_HEAD(cf_setting_lst, cf_setting_array);
80
81#define CF_MTX_INIT(x) sx_init((x), "cpufreq lock")
82#define CF_MTX_LOCK(x) sx_xlock((x))
83#define CF_MTX_UNLOCK(x) sx_xunlock((x))
84#define CF_MTX_ASSERT(x) sx_assert((x), SX_XLOCKED)
85
86#define CF_DEBUG(msg...) do { \
87 if (cf_verbose) \
88 printf("cpufreq: " msg); \
89 } while (0)
90
91static int cpufreq_attach(device_t dev);
92static int cpufreq_detach(device_t dev);
93static void cpufreq_evaluate(void *arg);
94static int cf_set_method(device_t dev, const struct cf_level *level,
95 int priority);
96static int cf_get_method(device_t dev, struct cf_level *level);
97static int cf_levels_method(device_t dev, struct cf_level *levels,
98 int *count);
99static int cpufreq_insert_abs(struct cpufreq_softc *sc,
100 struct cf_setting *sets, int count);
101static int cpufreq_expand_set(struct cpufreq_softc *sc,
102 struct cf_setting_array *set_arr);
103static struct cf_level *cpufreq_dup_set(struct cpufreq_softc *sc,
104 struct cf_level *dup, struct cf_setting *set);
105static int cpufreq_curr_sysctl(SYSCTL_HANDLER_ARGS);
106static int cpufreq_levels_sysctl(SYSCTL_HANDLER_ARGS);
107static int cpufreq_settings_sysctl(SYSCTL_HANDLER_ARGS);
108
109static device_method_t cpufreq_methods[] = {
110 DEVMETHOD(device_probe, bus_generic_probe),
111 DEVMETHOD(device_attach, cpufreq_attach),
112 DEVMETHOD(device_detach, cpufreq_detach),
113
114 DEVMETHOD(cpufreq_set, cf_set_method),
115 DEVMETHOD(cpufreq_get, cf_get_method),
116 DEVMETHOD(cpufreq_levels, cf_levels_method),
117 {0, 0}
118};
119static driver_t cpufreq_driver = {
120 "cpufreq", cpufreq_methods, sizeof(struct cpufreq_softc)
121};
122static devclass_t cpufreq_dc;
123DRIVER_MODULE(cpufreq, cpu, cpufreq_driver, cpufreq_dc, 0, 0);
124
125static eventhandler_tag cf_ev_tag;
126
127static int cf_lowest_freq;
128static int cf_verbose;
129TUNABLE_INT("debug.cpufreq.lowest", &cf_lowest_freq);
130TUNABLE_INT("debug.cpufreq.verbose", &cf_verbose);
131SYSCTL_NODE(_debug, OID_AUTO, cpufreq, CTLFLAG_RD, NULL, "cpufreq debugging");
132SYSCTL_INT(_debug_cpufreq, OID_AUTO, lowest, CTLFLAG_RW, &cf_lowest_freq, 1,
133 "Don't provide levels below this frequency.");
134SYSCTL_INT(_debug_cpufreq, OID_AUTO, verbose, CTLFLAG_RW, &cf_verbose, 1,
135 "Print verbose debugging messages");
136
137static int
138cpufreq_attach(device_t dev)
139{
140 struct cpufreq_softc *sc;
141 device_t parent;
142 int numdevs;
143
144 CF_DEBUG("initializing %s\n", device_get_nameunit(dev));
145 sc = device_get_softc(dev);
146 parent = device_get_parent(dev);
147 sc->dev = dev;
148 sysctl_ctx_init(&sc->sysctl_ctx);
149 TAILQ_INIT(&sc->all_levels);
150 CF_MTX_INIT(&sc->lock);
151 sc->curr_level.total_set.freq = CPUFREQ_VAL_UNKNOWN;
152 sc->saved_level.total_set.freq = CPUFREQ_VAL_UNKNOWN;
153 sc->max_mhz = CPUFREQ_VAL_UNKNOWN;
154
155 /*
156 * Only initialize one set of sysctls for all CPUs. In the future,
157 * if multiple CPUs can have different settings, we can move these
158 * sysctls to be under every CPU instead of just the first one.
159 */
160 numdevs = devclass_get_count(cpufreq_dc);
161 if (numdevs > 1)
162 return (0);
163
164 CF_DEBUG("initializing one-time data for %s\n",
165 device_get_nameunit(dev));
166 SYSCTL_ADD_PROC(&sc->sysctl_ctx,
167 SYSCTL_CHILDREN(device_get_sysctl_tree(parent)),
168 OID_AUTO, "freq", CTLTYPE_INT | CTLFLAG_RW, sc, 0,
169 cpufreq_curr_sysctl, "I", "Current CPU frequency");
170 SYSCTL_ADD_PROC(&sc->sysctl_ctx,
171 SYSCTL_CHILDREN(device_get_sysctl_tree(parent)),
172 OID_AUTO, "freq_levels", CTLTYPE_STRING | CTLFLAG_RD, sc, 0,
173 cpufreq_levels_sysctl, "A", "CPU frequency levels");
174 cf_ev_tag = EVENTHANDLER_REGISTER(cpufreq_changed, cpufreq_evaluate,
175 NULL, EVENTHANDLER_PRI_ANY);
176
177 return (0);
178}
179
180static int
181cpufreq_detach(device_t dev)
182{
183 struct cpufreq_softc *sc;
184 int numdevs;
185
186 CF_DEBUG("shutdown %s\n", device_get_nameunit(dev));
187 sc = device_get_softc(dev);
188 sysctl_ctx_free(&sc->sysctl_ctx);
189
190 /* Only clean up these resources when the last device is detaching. */
191 numdevs = devclass_get_count(cpufreq_dc);
192 if (numdevs == 1) {
193 CF_DEBUG("final shutdown for %s\n", device_get_nameunit(dev));
194 EVENTHANDLER_DEREGISTER(cpufreq_changed, cf_ev_tag);
195 }
196
197 return (0);
198}
199
200static void
201cpufreq_evaluate(void *arg)
202{
203 /* TODO: Re-evaluate when notified of changes to drivers. */
204}
205
206static int
207cf_set_method(device_t dev, const struct cf_level *level, int priority)
208{
209 struct cpufreq_softc *sc;
210 const struct cf_setting *set;
211 struct pcpu *pc;
212 int cpu_id, error, i;
213
214 sc = device_get_softc(dev);
215 error = 0;
216 set = NULL;
217
218 /*
219 * Check that the TSC isn't being used as a timecounter.
220 * If it is, then return EBUSY and refuse to change the
221 * clock speed.
222 */
223 if (strcmp(timecounter->tc_name, "TSC") == 0)
224 return (EBUSY);
225
226 /*
227 * If the caller didn't specify a level and one is saved, prepare to
228 * restore the saved level. If none has been saved, return an error.
229 * If they did specify one, but the requested level has a lower
230 * priority, don't allow the new level right now.
231 */
232 CF_MTX_LOCK(&sc->lock);
233 if (level == NULL) {
234 if (sc->saved_level.total_set.freq != CPUFREQ_VAL_UNKNOWN) {
235 level = &sc->saved_level;
236 priority = sc->saved_priority;
237 CF_DEBUG("restoring saved level, freq %d prio %d\n",
238 level->total_set.freq, priority);
239 } else {
240 CF_DEBUG("NULL level, no saved level\n");
241 error = ENXIO;
242 goto out;
243 }
244 } else if (priority < sc->curr_priority) {
245 CF_DEBUG("ignoring, curr prio %d less than %d\n", priority,
246 sc->curr_priority);
247 error = EPERM;
248 goto out;
249 }
250
251 /* Reject levels that are below our specified threshold. */
252 if (level->total_set.freq < cf_lowest_freq) {
253 CF_DEBUG("rejecting freq %d, less than %d limit\n",
254 level->total_set.freq, cf_lowest_freq);
255 error = EINVAL;
256 goto out;
257 }
258
259 /* If already at this level, just return. */
260 if (CPUFREQ_CMP(sc->curr_level.total_set.freq, level->total_set.freq)) {
261 CF_DEBUG("skipping freq %d, same as current level %d\n",
262 level->total_set.freq, sc->curr_level.total_set.freq);
263 goto skip;
264 }
265
266 /* First, set the absolute frequency via its driver. */
267 set = &level->abs_set;
268 if (set->dev) {
269 if (!device_is_attached(set->dev)) {
270 error = ENXIO;
271 goto out;
272 }
273
274 /* Bind to the target CPU before switching, if necessary. */
275 cpu_id = PCPU_GET(cpuid);
276 pc = cpu_get_pcpu(set->dev);
277 if (cpu_id != pc->pc_cpuid) {
278 mtx_lock_spin(&sched_lock);
279 sched_bind(curthread, pc->pc_cpuid);
280 mtx_unlock_spin(&sched_lock);
281 }
282 CF_DEBUG("setting abs freq %d on %s (cpu %d)\n", set->freq,
283 device_get_nameunit(set->dev), PCPU_GET(cpuid));
284 error = CPUFREQ_DRV_SET(set->dev, set);
285 if (cpu_id != pc->pc_cpuid) {
286 mtx_lock_spin(&sched_lock);
287 sched_unbind(curthread);
288 mtx_unlock_spin(&sched_lock);
289 }
290 if (error) {
291 goto out;
292 }
293 }
294
295 /* Next, set any/all relative frequencies via their drivers. */
296 for (i = 0; i < level->rel_count; i++) {
297 set = &level->rel_set[i];
298 if (!device_is_attached(set->dev)) {
299 error = ENXIO;
300 goto out;
301 }
302
303 /* Bind to the target CPU before switching, if necessary. */
304 cpu_id = PCPU_GET(cpuid);
305 pc = cpu_get_pcpu(set->dev);
306 if (cpu_id != pc->pc_cpuid) {
307 mtx_lock_spin(&sched_lock);
308 sched_bind(curthread, pc->pc_cpuid);
309 mtx_unlock_spin(&sched_lock);
310 }
311 CF_DEBUG("setting rel freq %d on %s (cpu %d)\n", set->freq,
312 device_get_nameunit(set->dev), PCPU_GET(cpuid));
313 error = CPUFREQ_DRV_SET(set->dev, set);
314 if (cpu_id != pc->pc_cpuid) {
315 mtx_lock_spin(&sched_lock);
316 sched_unbind(curthread);
317 mtx_unlock_spin(&sched_lock);
318 }
319 if (error) {
320 /* XXX Back out any successful setting? */
321 goto out;
322 }
323 }
324
325skip:
326 /* If we were restoring a saved state, reset it to "unused". */
327 if (level == &sc->saved_level) {
328 CF_DEBUG("resetting saved level\n");
329 sc->saved_level.total_set.freq = CPUFREQ_VAL_UNKNOWN;
330 sc->saved_priority = 0;
331 }
332
333 /*
334 * Before recording the current level, check if we're going to a
335 * higher priority and have not saved a level yet. If so, save the
336 * previous level and priority.
337 */
338 if (sc->curr_level.total_set.freq != CPUFREQ_VAL_UNKNOWN &&
339 sc->saved_level.total_set.freq == CPUFREQ_VAL_UNKNOWN &&
340 priority > CPUFREQ_PRIO_USER && priority > sc->curr_priority) {
341 CF_DEBUG("saving level, freq %d prio %d\n",
342 sc->curr_level.total_set.freq, sc->curr_priority);
343 sc->saved_level = sc->curr_level;
344 sc->saved_priority = sc->curr_priority;
345 }
346 sc->curr_level = *level;
347 sc->curr_priority = priority;
348
349out:
350 CF_MTX_UNLOCK(&sc->lock);
351 if (error && set)
352 device_printf(set->dev, "set freq failed, err %d\n", error);
353 return (error);
354}
355
356static int
357cf_get_method(device_t dev, struct cf_level *level)
358{
359 struct cpufreq_softc *sc;
360 struct cf_level *levels;
361 struct cf_setting *curr_set, set;
362 struct pcpu *pc;
363 device_t *devs;
364 int count, error, i, numdevs;
365 uint64_t rate;
366
367 sc = device_get_softc(dev);
368 error = 0;
369 levels = NULL;
370
371 /* If we already know the current frequency, we're done. */
372 CF_MTX_LOCK(&sc->lock);
373 curr_set = &sc->curr_level.total_set;
374 if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) {
375 CF_DEBUG("get returning known freq %d\n", curr_set->freq);
376 goto out;
377 }
378 CF_MTX_UNLOCK(&sc->lock);
379
380 /*
381 * We need to figure out the current level. Loop through every
382 * driver, getting the current setting. Then, attempt to get a best
383 * match of settings against each level.
384 */
385 count = CF_MAX_LEVELS;
386 levels = malloc(count * sizeof(*levels), M_TEMP, M_NOWAIT);
387 if (levels == NULL)
388 return (ENOMEM);
389 error = CPUFREQ_LEVELS(sc->dev, levels, &count);
390 if (error) {
391 if (error == E2BIG)
392 printf("cpufreq: need to increase CF_MAX_LEVELS\n");
393 free(levels, M_TEMP);
394 return (error);
395 }
396 error = device_get_children(device_get_parent(dev), &devs, &numdevs);
397 if (error) {
398 free(levels, M_TEMP);
399 return (error);
400 }
401
402 /*
403 * Reacquire the lock and search for the given level.
404 *
405 * XXX Note: this is not quite right since we really need to go
406 * through each level and compare both absolute and relative
407 * settings for each driver in the system before making a match.
408 * The estimation code below catches this case though.
409 */
410 CF_MTX_LOCK(&sc->lock);
411 for (i = 0; i < numdevs && curr_set->freq == CPUFREQ_VAL_UNKNOWN; i++) {
412 if (!device_is_attached(devs[i]))
413 continue;
414 error = CPUFREQ_DRV_GET(devs[i], &set);
415 if (error)
416 continue;
417 for (i = 0; i < count; i++) {
418 if (CPUFREQ_CMP(set.freq, levels[i].total_set.freq)) {
419 sc->curr_level = levels[i];
420 break;
421 }
422 }
423 }
424 free(devs, M_TEMP);
425 if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) {
426 CF_DEBUG("get matched freq %d from drivers\n", curr_set->freq);
427 goto out;
428 }
429
430 /*
431 * We couldn't find an exact match, so attempt to estimate and then
432 * match against a level.
433 */
434 pc = cpu_get_pcpu(dev);
435 if (pc == NULL) {
436 error = ENXIO;
437 goto out;
438 }
439 cpu_est_clockrate(pc->pc_cpuid, &rate);
440 rate /= 1000000;
441 for (i = 0; i < count; i++) {
442 if (CPUFREQ_CMP(rate, levels[i].total_set.freq)) {
443 sc->curr_level = levels[i];
444 CF_DEBUG("get estimated freq %d\n", curr_set->freq);
445 break;
446 }
447 }
448
449out:
450 if (error == 0)
451 *level = sc->curr_level;
452
453 CF_MTX_UNLOCK(&sc->lock);
454 if (levels)
455 free(levels, M_TEMP);
456 return (error);
457}
458
459static int
460cf_levels_method(device_t dev, struct cf_level *levels, int *count)
461{
462 struct cf_setting_array *set_arr;
463 struct cf_setting_lst rel_sets;
464 struct cpufreq_softc *sc;
465 struct cf_level *lev;
466 struct cf_setting *sets;
467 struct pcpu *pc;
468 device_t *devs;
469 int error, i, numdevs, set_count, type;
470 uint64_t rate;
471
472 if (levels == NULL || count == NULL)
473 return (EINVAL);
474
475 TAILQ_INIT(&rel_sets);
476 sc = device_get_softc(dev);
477 error = device_get_children(device_get_parent(dev), &devs, &numdevs);
478 if (error)
479 return (error);
480 sets = malloc(MAX_SETTINGS * sizeof(*sets), M_TEMP, M_NOWAIT);
481 if (sets == NULL) {
482 free(devs, M_TEMP);
483 return (ENOMEM);
484 }
485
486 /* Get settings from all cpufreq drivers. */
487 CF_MTX_LOCK(&sc->lock);
488 for (i = 0; i < numdevs; i++) {
489 /* Skip devices that aren't ready. */
490 if (!device_is_attached(devs[i]))
491 continue;
492
493 /*
494 * Get settings, skipping drivers that offer no settings or
495 * provide settings for informational purposes only.
496 */
497 error = CPUFREQ_DRV_TYPE(devs[i], &type);
498 if (error || (type & CPUFREQ_FLAG_INFO_ONLY)) {
499 if (error == 0) {
500 CF_DEBUG("skipping info-only driver %s\n",
501 device_get_nameunit(devs[i]));
502 }
503 continue;
504 }
505 set_count = MAX_SETTINGS;
506 error = CPUFREQ_DRV_SETTINGS(devs[i], sets, &set_count);
507 if (error || set_count == 0)
508 continue;
509
510 /* Add the settings to our absolute/relative lists. */
511 switch (type & CPUFREQ_TYPE_MASK) {
512 case CPUFREQ_TYPE_ABSOLUTE:
513 error = cpufreq_insert_abs(sc, sets, set_count);
514 break;
515 case CPUFREQ_TYPE_RELATIVE:
516 CF_DEBUG("adding %d relative settings\n", set_count);
517 set_arr = malloc(sizeof(*set_arr), M_TEMP, M_NOWAIT);
518 if (set_arr == NULL) {
519 error = ENOMEM;
520 goto out;
521 }
522 bcopy(sets, set_arr->sets, set_count * sizeof(*sets));
523 set_arr->count = set_count;
524 TAILQ_INSERT_TAIL(&rel_sets, set_arr, link);
525 break;
526 default:
527 error = EINVAL;
528 }
529 if (error)
530 goto out;
531 }
532
533 /*
534 * If there are no absolute levels, create a fake one at 100%. We
535 * then cache the clockrate for later use as our base frequency.
536 *
537 * XXX This assumes that the first time through, if we only have
538 * relative drivers, the CPU is currently running at 100%.
539 */
540 if (TAILQ_EMPTY(&sc->all_levels)) {
541 if (sc->max_mhz == CPUFREQ_VAL_UNKNOWN) {
542 pc = cpu_get_pcpu(dev);
543 cpu_est_clockrate(pc->pc_cpuid, &rate);
544 sc->max_mhz = rate / 1000000;
545 }
546 memset(&sets[0], CPUFREQ_VAL_UNKNOWN, sizeof(*sets));
547 sets[0].freq = sc->max_mhz;
548 sets[0].dev = NULL;
549 error = cpufreq_insert_abs(sc, sets, 1);
550 if (error)
551 goto out;
552 }
553
554 /* Create a combined list of absolute + relative levels. */
555 TAILQ_FOREACH(set_arr, &rel_sets, link)
556 cpufreq_expand_set(sc, set_arr);
557
558 /* If the caller doesn't have enough space, return the actual count. */
559 if (sc->all_count > *count) {
560 *count = sc->all_count;
561 error = E2BIG;
562 goto out;
563 }
564
565 /* Finally, output the list of levels. */
566 i = 0;
567 TAILQ_FOREACH(lev, &sc->all_levels, link) {
568 /* Skip levels that have a frequency that is too low. */
569 if (lev->total_set.freq < cf_lowest_freq) {
570 sc->all_count--;
571 continue;
572 }
573
574 levels[i] = *lev;
575 i++;
576 }
577 *count = sc->all_count;
578 error = 0;
579
580out:
581 /* Clear all levels since we regenerate them each time. */
582 while ((lev = TAILQ_FIRST(&sc->all_levels)) != NULL) {
583 TAILQ_REMOVE(&sc->all_levels, lev, link);
584 free(lev, M_TEMP);
585 }
586 sc->all_count = 0;
587
588 CF_MTX_UNLOCK(&sc->lock);
589 while ((set_arr = TAILQ_FIRST(&rel_sets)) != NULL) {
590 TAILQ_REMOVE(&rel_sets, set_arr, link);
591 free(set_arr, M_TEMP);
592 }
593 free(devs, M_TEMP);
594 free(sets, M_TEMP);
595 return (error);
596}
597
598/*
599 * Create levels for an array of absolute settings and insert them in
600 * sorted order in the specified list.
601 */
602static int
603cpufreq_insert_abs(struct cpufreq_softc *sc, struct cf_setting *sets,
604 int count)
605{
606 struct cf_level_lst *list;
607 struct cf_level *level, *search;
608 int i;
609
610 CF_MTX_ASSERT(&sc->lock);
611
612 list = &sc->all_levels;
613 for (i = 0; i < count; i++) {
614 level = malloc(sizeof(*level), M_TEMP, M_NOWAIT | M_ZERO);
615 if (level == NULL)
616 return (ENOMEM);
617 level->abs_set = sets[i];
618 level->total_set = sets[i];
619 level->total_set.dev = NULL;
620 sc->all_count++;
621
622 if (TAILQ_EMPTY(list)) {
623 CF_DEBUG("adding abs setting %d at head\n",
624 sets[i].freq);
625 TAILQ_INSERT_HEAD(list, level, link);
626 continue;
627 }
628
629 TAILQ_FOREACH_REVERSE(search, list, cf_level_lst, link) {
630 if (sets[i].freq <= search->total_set.freq) {
631 CF_DEBUG("adding abs setting %d after %d\n",
632 sets[i].freq, search->total_set.freq);
633 TAILQ_INSERT_AFTER(list, search, level, link);
634 break;
635 }
636 }
637 }
638 return (0);
639}
640
641/*
642 * Expand a group of relative settings, creating derived levels from them.
643 */
644static int
645cpufreq_expand_set(struct cpufreq_softc *sc, struct cf_setting_array *set_arr)
646{
647 struct cf_level *fill, *search;
648 struct cf_setting *set;
649 int i;
650
651 CF_MTX_ASSERT(&sc->lock);
652
| 29
30#include <sys/param.h>
31#include <sys/bus.h>
32#include <sys/cpu.h>
33#include <sys/eventhandler.h>
34#include <sys/kernel.h>
35#include <sys/lock.h>
36#include <sys/malloc.h>
37#include <sys/module.h>
38#include <sys/proc.h>
39#include <sys/queue.h>
40#include <sys/sched.h>
41#include <sys/sysctl.h>
42#include <sys/systm.h>
43#include <sys/sbuf.h>
44#include <sys/sx.h>
45#include <sys/timetc.h>
46
47#include "cpufreq_if.h"
48
49/*
50 * Common CPU frequency glue code. Drivers for specific hardware can
51 * attach this interface to allow users to get/set the CPU frequency.
52 */
53
54/*
55 * Number of levels we can handle. Levels are synthesized from settings
56 * so for M settings and N drivers, there may be M*N levels.
57 */
58#define CF_MAX_LEVELS 64
59
60struct cpufreq_softc {
61 struct sx lock;
62 struct cf_level curr_level;
63 int curr_priority;
64 struct cf_level saved_level;
65 int saved_priority;
66 struct cf_level_lst all_levels;
67 int all_count;
68 int max_mhz;
69 device_t dev;
70 struct sysctl_ctx_list sysctl_ctx;
71};
72
73struct cf_setting_array {
74 struct cf_setting sets[MAX_SETTINGS];
75 int count;
76 TAILQ_ENTRY(cf_setting_array) link;
77};
78
79TAILQ_HEAD(cf_setting_lst, cf_setting_array);
80
81#define CF_MTX_INIT(x) sx_init((x), "cpufreq lock")
82#define CF_MTX_LOCK(x) sx_xlock((x))
83#define CF_MTX_UNLOCK(x) sx_xunlock((x))
84#define CF_MTX_ASSERT(x) sx_assert((x), SX_XLOCKED)
85
86#define CF_DEBUG(msg...) do { \
87 if (cf_verbose) \
88 printf("cpufreq: " msg); \
89 } while (0)
90
91static int cpufreq_attach(device_t dev);
92static int cpufreq_detach(device_t dev);
93static void cpufreq_evaluate(void *arg);
94static int cf_set_method(device_t dev, const struct cf_level *level,
95 int priority);
96static int cf_get_method(device_t dev, struct cf_level *level);
97static int cf_levels_method(device_t dev, struct cf_level *levels,
98 int *count);
99static int cpufreq_insert_abs(struct cpufreq_softc *sc,
100 struct cf_setting *sets, int count);
101static int cpufreq_expand_set(struct cpufreq_softc *sc,
102 struct cf_setting_array *set_arr);
103static struct cf_level *cpufreq_dup_set(struct cpufreq_softc *sc,
104 struct cf_level *dup, struct cf_setting *set);
105static int cpufreq_curr_sysctl(SYSCTL_HANDLER_ARGS);
106static int cpufreq_levels_sysctl(SYSCTL_HANDLER_ARGS);
107static int cpufreq_settings_sysctl(SYSCTL_HANDLER_ARGS);
108
109static device_method_t cpufreq_methods[] = {
110 DEVMETHOD(device_probe, bus_generic_probe),
111 DEVMETHOD(device_attach, cpufreq_attach),
112 DEVMETHOD(device_detach, cpufreq_detach),
113
114 DEVMETHOD(cpufreq_set, cf_set_method),
115 DEVMETHOD(cpufreq_get, cf_get_method),
116 DEVMETHOD(cpufreq_levels, cf_levels_method),
117 {0, 0}
118};
119static driver_t cpufreq_driver = {
120 "cpufreq", cpufreq_methods, sizeof(struct cpufreq_softc)
121};
122static devclass_t cpufreq_dc;
123DRIVER_MODULE(cpufreq, cpu, cpufreq_driver, cpufreq_dc, 0, 0);
124
125static eventhandler_tag cf_ev_tag;
126
127static int cf_lowest_freq;
128static int cf_verbose;
129TUNABLE_INT("debug.cpufreq.lowest", &cf_lowest_freq);
130TUNABLE_INT("debug.cpufreq.verbose", &cf_verbose);
131SYSCTL_NODE(_debug, OID_AUTO, cpufreq, CTLFLAG_RD, NULL, "cpufreq debugging");
132SYSCTL_INT(_debug_cpufreq, OID_AUTO, lowest, CTLFLAG_RW, &cf_lowest_freq, 1,
133 "Don't provide levels below this frequency.");
134SYSCTL_INT(_debug_cpufreq, OID_AUTO, verbose, CTLFLAG_RW, &cf_verbose, 1,
135 "Print verbose debugging messages");
136
137static int
138cpufreq_attach(device_t dev)
139{
140 struct cpufreq_softc *sc;
141 device_t parent;
142 int numdevs;
143
144 CF_DEBUG("initializing %s\n", device_get_nameunit(dev));
145 sc = device_get_softc(dev);
146 parent = device_get_parent(dev);
147 sc->dev = dev;
148 sysctl_ctx_init(&sc->sysctl_ctx);
149 TAILQ_INIT(&sc->all_levels);
150 CF_MTX_INIT(&sc->lock);
151 sc->curr_level.total_set.freq = CPUFREQ_VAL_UNKNOWN;
152 sc->saved_level.total_set.freq = CPUFREQ_VAL_UNKNOWN;
153 sc->max_mhz = CPUFREQ_VAL_UNKNOWN;
154
155 /*
156 * Only initialize one set of sysctls for all CPUs. In the future,
157 * if multiple CPUs can have different settings, we can move these
158 * sysctls to be under every CPU instead of just the first one.
159 */
160 numdevs = devclass_get_count(cpufreq_dc);
161 if (numdevs > 1)
162 return (0);
163
164 CF_DEBUG("initializing one-time data for %s\n",
165 device_get_nameunit(dev));
166 SYSCTL_ADD_PROC(&sc->sysctl_ctx,
167 SYSCTL_CHILDREN(device_get_sysctl_tree(parent)),
168 OID_AUTO, "freq", CTLTYPE_INT | CTLFLAG_RW, sc, 0,
169 cpufreq_curr_sysctl, "I", "Current CPU frequency");
170 SYSCTL_ADD_PROC(&sc->sysctl_ctx,
171 SYSCTL_CHILDREN(device_get_sysctl_tree(parent)),
172 OID_AUTO, "freq_levels", CTLTYPE_STRING | CTLFLAG_RD, sc, 0,
173 cpufreq_levels_sysctl, "A", "CPU frequency levels");
174 cf_ev_tag = EVENTHANDLER_REGISTER(cpufreq_changed, cpufreq_evaluate,
175 NULL, EVENTHANDLER_PRI_ANY);
176
177 return (0);
178}
179
180static int
181cpufreq_detach(device_t dev)
182{
183 struct cpufreq_softc *sc;
184 int numdevs;
185
186 CF_DEBUG("shutdown %s\n", device_get_nameunit(dev));
187 sc = device_get_softc(dev);
188 sysctl_ctx_free(&sc->sysctl_ctx);
189
190 /* Only clean up these resources when the last device is detaching. */
191 numdevs = devclass_get_count(cpufreq_dc);
192 if (numdevs == 1) {
193 CF_DEBUG("final shutdown for %s\n", device_get_nameunit(dev));
194 EVENTHANDLER_DEREGISTER(cpufreq_changed, cf_ev_tag);
195 }
196
197 return (0);
198}
199
200static void
201cpufreq_evaluate(void *arg)
202{
203 /* TODO: Re-evaluate when notified of changes to drivers. */
204}
205
206static int
207cf_set_method(device_t dev, const struct cf_level *level, int priority)
208{
209 struct cpufreq_softc *sc;
210 const struct cf_setting *set;
211 struct pcpu *pc;
212 int cpu_id, error, i;
213
214 sc = device_get_softc(dev);
215 error = 0;
216 set = NULL;
217
218 /*
219 * Check that the TSC isn't being used as a timecounter.
220 * If it is, then return EBUSY and refuse to change the
221 * clock speed.
222 */
223 if (strcmp(timecounter->tc_name, "TSC") == 0)
224 return (EBUSY);
225
226 /*
227 * If the caller didn't specify a level and one is saved, prepare to
228 * restore the saved level. If none has been saved, return an error.
229 * If they did specify one, but the requested level has a lower
230 * priority, don't allow the new level right now.
231 */
232 CF_MTX_LOCK(&sc->lock);
233 if (level == NULL) {
234 if (sc->saved_level.total_set.freq != CPUFREQ_VAL_UNKNOWN) {
235 level = &sc->saved_level;
236 priority = sc->saved_priority;
237 CF_DEBUG("restoring saved level, freq %d prio %d\n",
238 level->total_set.freq, priority);
239 } else {
240 CF_DEBUG("NULL level, no saved level\n");
241 error = ENXIO;
242 goto out;
243 }
244 } else if (priority < sc->curr_priority) {
245 CF_DEBUG("ignoring, curr prio %d less than %d\n", priority,
246 sc->curr_priority);
247 error = EPERM;
248 goto out;
249 }
250
251 /* Reject levels that are below our specified threshold. */
252 if (level->total_set.freq < cf_lowest_freq) {
253 CF_DEBUG("rejecting freq %d, less than %d limit\n",
254 level->total_set.freq, cf_lowest_freq);
255 error = EINVAL;
256 goto out;
257 }
258
259 /* If already at this level, just return. */
260 if (CPUFREQ_CMP(sc->curr_level.total_set.freq, level->total_set.freq)) {
261 CF_DEBUG("skipping freq %d, same as current level %d\n",
262 level->total_set.freq, sc->curr_level.total_set.freq);
263 goto skip;
264 }
265
266 /* First, set the absolute frequency via its driver. */
267 set = &level->abs_set;
268 if (set->dev) {
269 if (!device_is_attached(set->dev)) {
270 error = ENXIO;
271 goto out;
272 }
273
274 /* Bind to the target CPU before switching, if necessary. */
275 cpu_id = PCPU_GET(cpuid);
276 pc = cpu_get_pcpu(set->dev);
277 if (cpu_id != pc->pc_cpuid) {
278 mtx_lock_spin(&sched_lock);
279 sched_bind(curthread, pc->pc_cpuid);
280 mtx_unlock_spin(&sched_lock);
281 }
282 CF_DEBUG("setting abs freq %d on %s (cpu %d)\n", set->freq,
283 device_get_nameunit(set->dev), PCPU_GET(cpuid));
284 error = CPUFREQ_DRV_SET(set->dev, set);
285 if (cpu_id != pc->pc_cpuid) {
286 mtx_lock_spin(&sched_lock);
287 sched_unbind(curthread);
288 mtx_unlock_spin(&sched_lock);
289 }
290 if (error) {
291 goto out;
292 }
293 }
294
295 /* Next, set any/all relative frequencies via their drivers. */
296 for (i = 0; i < level->rel_count; i++) {
297 set = &level->rel_set[i];
298 if (!device_is_attached(set->dev)) {
299 error = ENXIO;
300 goto out;
301 }
302
303 /* Bind to the target CPU before switching, if necessary. */
304 cpu_id = PCPU_GET(cpuid);
305 pc = cpu_get_pcpu(set->dev);
306 if (cpu_id != pc->pc_cpuid) {
307 mtx_lock_spin(&sched_lock);
308 sched_bind(curthread, pc->pc_cpuid);
309 mtx_unlock_spin(&sched_lock);
310 }
311 CF_DEBUG("setting rel freq %d on %s (cpu %d)\n", set->freq,
312 device_get_nameunit(set->dev), PCPU_GET(cpuid));
313 error = CPUFREQ_DRV_SET(set->dev, set);
314 if (cpu_id != pc->pc_cpuid) {
315 mtx_lock_spin(&sched_lock);
316 sched_unbind(curthread);
317 mtx_unlock_spin(&sched_lock);
318 }
319 if (error) {
320 /* XXX Back out any successful setting? */
321 goto out;
322 }
323 }
324
325skip:
326 /* If we were restoring a saved state, reset it to "unused". */
327 if (level == &sc->saved_level) {
328 CF_DEBUG("resetting saved level\n");
329 sc->saved_level.total_set.freq = CPUFREQ_VAL_UNKNOWN;
330 sc->saved_priority = 0;
331 }
332
333 /*
334 * Before recording the current level, check if we're going to a
335 * higher priority and have not saved a level yet. If so, save the
336 * previous level and priority.
337 */
338 if (sc->curr_level.total_set.freq != CPUFREQ_VAL_UNKNOWN &&
339 sc->saved_level.total_set.freq == CPUFREQ_VAL_UNKNOWN &&
340 priority > CPUFREQ_PRIO_USER && priority > sc->curr_priority) {
341 CF_DEBUG("saving level, freq %d prio %d\n",
342 sc->curr_level.total_set.freq, sc->curr_priority);
343 sc->saved_level = sc->curr_level;
344 sc->saved_priority = sc->curr_priority;
345 }
346 sc->curr_level = *level;
347 sc->curr_priority = priority;
348
349out:
350 CF_MTX_UNLOCK(&sc->lock);
351 if (error && set)
352 device_printf(set->dev, "set freq failed, err %d\n", error);
353 return (error);
354}
355
356static int
357cf_get_method(device_t dev, struct cf_level *level)
358{
359 struct cpufreq_softc *sc;
360 struct cf_level *levels;
361 struct cf_setting *curr_set, set;
362 struct pcpu *pc;
363 device_t *devs;
364 int count, error, i, numdevs;
365 uint64_t rate;
366
367 sc = device_get_softc(dev);
368 error = 0;
369 levels = NULL;
370
371 /* If we already know the current frequency, we're done. */
372 CF_MTX_LOCK(&sc->lock);
373 curr_set = &sc->curr_level.total_set;
374 if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) {
375 CF_DEBUG("get returning known freq %d\n", curr_set->freq);
376 goto out;
377 }
378 CF_MTX_UNLOCK(&sc->lock);
379
380 /*
381 * We need to figure out the current level. Loop through every
382 * driver, getting the current setting. Then, attempt to get a best
383 * match of settings against each level.
384 */
385 count = CF_MAX_LEVELS;
386 levels = malloc(count * sizeof(*levels), M_TEMP, M_NOWAIT);
387 if (levels == NULL)
388 return (ENOMEM);
389 error = CPUFREQ_LEVELS(sc->dev, levels, &count);
390 if (error) {
391 if (error == E2BIG)
392 printf("cpufreq: need to increase CF_MAX_LEVELS\n");
393 free(levels, M_TEMP);
394 return (error);
395 }
396 error = device_get_children(device_get_parent(dev), &devs, &numdevs);
397 if (error) {
398 free(levels, M_TEMP);
399 return (error);
400 }
401
402 /*
403 * Reacquire the lock and search for the given level.
404 *
405 * XXX Note: this is not quite right since we really need to go
406 * through each level and compare both absolute and relative
407 * settings for each driver in the system before making a match.
408 * The estimation code below catches this case though.
409 */
410 CF_MTX_LOCK(&sc->lock);
411 for (i = 0; i < numdevs && curr_set->freq == CPUFREQ_VAL_UNKNOWN; i++) {
412 if (!device_is_attached(devs[i]))
413 continue;
414 error = CPUFREQ_DRV_GET(devs[i], &set);
415 if (error)
416 continue;
417 for (i = 0; i < count; i++) {
418 if (CPUFREQ_CMP(set.freq, levels[i].total_set.freq)) {
419 sc->curr_level = levels[i];
420 break;
421 }
422 }
423 }
424 free(devs, M_TEMP);
425 if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) {
426 CF_DEBUG("get matched freq %d from drivers\n", curr_set->freq);
427 goto out;
428 }
429
430 /*
431 * We couldn't find an exact match, so attempt to estimate and then
432 * match against a level.
433 */
434 pc = cpu_get_pcpu(dev);
435 if (pc == NULL) {
436 error = ENXIO;
437 goto out;
438 }
439 cpu_est_clockrate(pc->pc_cpuid, &rate);
440 rate /= 1000000;
441 for (i = 0; i < count; i++) {
442 if (CPUFREQ_CMP(rate, levels[i].total_set.freq)) {
443 sc->curr_level = levels[i];
444 CF_DEBUG("get estimated freq %d\n", curr_set->freq);
445 break;
446 }
447 }
448
449out:
450 if (error == 0)
451 *level = sc->curr_level;
452
453 CF_MTX_UNLOCK(&sc->lock);
454 if (levels)
455 free(levels, M_TEMP);
456 return (error);
457}
458
459static int
460cf_levels_method(device_t dev, struct cf_level *levels, int *count)
461{
462 struct cf_setting_array *set_arr;
463 struct cf_setting_lst rel_sets;
464 struct cpufreq_softc *sc;
465 struct cf_level *lev;
466 struct cf_setting *sets;
467 struct pcpu *pc;
468 device_t *devs;
469 int error, i, numdevs, set_count, type;
470 uint64_t rate;
471
472 if (levels == NULL || count == NULL)
473 return (EINVAL);
474
475 TAILQ_INIT(&rel_sets);
476 sc = device_get_softc(dev);
477 error = device_get_children(device_get_parent(dev), &devs, &numdevs);
478 if (error)
479 return (error);
480 sets = malloc(MAX_SETTINGS * sizeof(*sets), M_TEMP, M_NOWAIT);
481 if (sets == NULL) {
482 free(devs, M_TEMP);
483 return (ENOMEM);
484 }
485
486 /* Get settings from all cpufreq drivers. */
487 CF_MTX_LOCK(&sc->lock);
488 for (i = 0; i < numdevs; i++) {
489 /* Skip devices that aren't ready. */
490 if (!device_is_attached(devs[i]))
491 continue;
492
493 /*
494 * Get settings, skipping drivers that offer no settings or
495 * provide settings for informational purposes only.
496 */
497 error = CPUFREQ_DRV_TYPE(devs[i], &type);
498 if (error || (type & CPUFREQ_FLAG_INFO_ONLY)) {
499 if (error == 0) {
500 CF_DEBUG("skipping info-only driver %s\n",
501 device_get_nameunit(devs[i]));
502 }
503 continue;
504 }
505 set_count = MAX_SETTINGS;
506 error = CPUFREQ_DRV_SETTINGS(devs[i], sets, &set_count);
507 if (error || set_count == 0)
508 continue;
509
510 /* Add the settings to our absolute/relative lists. */
511 switch (type & CPUFREQ_TYPE_MASK) {
512 case CPUFREQ_TYPE_ABSOLUTE:
513 error = cpufreq_insert_abs(sc, sets, set_count);
514 break;
515 case CPUFREQ_TYPE_RELATIVE:
516 CF_DEBUG("adding %d relative settings\n", set_count);
517 set_arr = malloc(sizeof(*set_arr), M_TEMP, M_NOWAIT);
518 if (set_arr == NULL) {
519 error = ENOMEM;
520 goto out;
521 }
522 bcopy(sets, set_arr->sets, set_count * sizeof(*sets));
523 set_arr->count = set_count;
524 TAILQ_INSERT_TAIL(&rel_sets, set_arr, link);
525 break;
526 default:
527 error = EINVAL;
528 }
529 if (error)
530 goto out;
531 }
532
533 /*
534 * If there are no absolute levels, create a fake one at 100%. We
535 * then cache the clockrate for later use as our base frequency.
536 *
537 * XXX This assumes that the first time through, if we only have
538 * relative drivers, the CPU is currently running at 100%.
539 */
540 if (TAILQ_EMPTY(&sc->all_levels)) {
541 if (sc->max_mhz == CPUFREQ_VAL_UNKNOWN) {
542 pc = cpu_get_pcpu(dev);
543 cpu_est_clockrate(pc->pc_cpuid, &rate);
544 sc->max_mhz = rate / 1000000;
545 }
546 memset(&sets[0], CPUFREQ_VAL_UNKNOWN, sizeof(*sets));
547 sets[0].freq = sc->max_mhz;
548 sets[0].dev = NULL;
549 error = cpufreq_insert_abs(sc, sets, 1);
550 if (error)
551 goto out;
552 }
553
554 /* Create a combined list of absolute + relative levels. */
555 TAILQ_FOREACH(set_arr, &rel_sets, link)
556 cpufreq_expand_set(sc, set_arr);
557
558 /* If the caller doesn't have enough space, return the actual count. */
559 if (sc->all_count > *count) {
560 *count = sc->all_count;
561 error = E2BIG;
562 goto out;
563 }
564
565 /* Finally, output the list of levels. */
566 i = 0;
567 TAILQ_FOREACH(lev, &sc->all_levels, link) {
568 /* Skip levels that have a frequency that is too low. */
569 if (lev->total_set.freq < cf_lowest_freq) {
570 sc->all_count--;
571 continue;
572 }
573
574 levels[i] = *lev;
575 i++;
576 }
577 *count = sc->all_count;
578 error = 0;
579
580out:
581 /* Clear all levels since we regenerate them each time. */
582 while ((lev = TAILQ_FIRST(&sc->all_levels)) != NULL) {
583 TAILQ_REMOVE(&sc->all_levels, lev, link);
584 free(lev, M_TEMP);
585 }
586 sc->all_count = 0;
587
588 CF_MTX_UNLOCK(&sc->lock);
589 while ((set_arr = TAILQ_FIRST(&rel_sets)) != NULL) {
590 TAILQ_REMOVE(&rel_sets, set_arr, link);
591 free(set_arr, M_TEMP);
592 }
593 free(devs, M_TEMP);
594 free(sets, M_TEMP);
595 return (error);
596}
597
598/*
599 * Create levels for an array of absolute settings and insert them in
600 * sorted order in the specified list.
601 */
602static int
603cpufreq_insert_abs(struct cpufreq_softc *sc, struct cf_setting *sets,
604 int count)
605{
606 struct cf_level_lst *list;
607 struct cf_level *level, *search;
608 int i;
609
610 CF_MTX_ASSERT(&sc->lock);
611
612 list = &sc->all_levels;
613 for (i = 0; i < count; i++) {
614 level = malloc(sizeof(*level), M_TEMP, M_NOWAIT | M_ZERO);
615 if (level == NULL)
616 return (ENOMEM);
617 level->abs_set = sets[i];
618 level->total_set = sets[i];
619 level->total_set.dev = NULL;
620 sc->all_count++;
621
622 if (TAILQ_EMPTY(list)) {
623 CF_DEBUG("adding abs setting %d at head\n",
624 sets[i].freq);
625 TAILQ_INSERT_HEAD(list, level, link);
626 continue;
627 }
628
629 TAILQ_FOREACH_REVERSE(search, list, cf_level_lst, link) {
630 if (sets[i].freq <= search->total_set.freq) {
631 CF_DEBUG("adding abs setting %d after %d\n",
632 sets[i].freq, search->total_set.freq);
633 TAILQ_INSERT_AFTER(list, search, level, link);
634 break;
635 }
636 }
637 }
638 return (0);
639}
640
641/*
642 * Expand a group of relative settings, creating derived levels from them.
643 */
644static int
645cpufreq_expand_set(struct cpufreq_softc *sc, struct cf_setting_array *set_arr)
646{
647 struct cf_level *fill, *search;
648 struct cf_setting *set;
649 int i;
650
651 CF_MTX_ASSERT(&sc->lock);
652
|
782 return (fill);
783}
784
785static int
786cpufreq_curr_sysctl(SYSCTL_HANDLER_ARGS)
787{
788 struct cpufreq_softc *sc;
789 struct cf_level *levels;
790 int count, devcount, error, freq, i, n;
791 device_t *devs;
792
793 devs = NULL;
794 sc = oidp->oid_arg1;
795 levels = malloc(CF_MAX_LEVELS * sizeof(*levels), M_TEMP, M_NOWAIT);
796 if (levels == NULL)
797 return (ENOMEM);
798
799 error = CPUFREQ_GET(sc->dev, &levels[0]);
800 if (error)
801 goto out;
802 freq = levels[0].total_set.freq;
803 error = sysctl_handle_int(oidp, &freq, 0, req);
804 if (error != 0 || req->newptr == NULL)
805 goto out;
806
807 /*
808 * While we only call cpufreq_get() on one device (assuming all
809 * CPUs have equal levels), we call cpufreq_set() on all CPUs.
810 * This is needed for some MP systems.
811 */
812 error = devclass_get_devices(cpufreq_dc, &devs, &devcount);
813 if (error)
814 goto out;
815 for (n = 0; n < devcount; n++) {
816 count = CF_MAX_LEVELS;
817 error = CPUFREQ_LEVELS(devs[n], levels, &count);
818 if (error) {
819 if (error == E2BIG)
820 printf(
821 "cpufreq: need to increase CF_MAX_LEVELS\n");
822 break;
823 }
824 for (i = 0; i < count; i++) {
825 if (CPUFREQ_CMP(levels[i].total_set.freq, freq)) {
826 error = CPUFREQ_SET(devs[n], &levels[i],
827 CPUFREQ_PRIO_USER);
828 break;
829 }
830 }
831 if (i == count) {
832 error = EINVAL;
833 break;
834 }
835 }
836
837out:
838 if (devs)
839 free(devs, M_TEMP);
840 if (levels)
841 free(levels, M_TEMP);
842 return (error);
843}
844
845static int
846cpufreq_levels_sysctl(SYSCTL_HANDLER_ARGS)
847{
848 struct cpufreq_softc *sc;
849 struct cf_level *levels;
850 struct cf_setting *set;
851 struct sbuf sb;
852 int count, error, i;
853
854 sc = oidp->oid_arg1;
855 sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND);
856
857 /* Get settings from the device and generate the output string. */
858 count = CF_MAX_LEVELS;
859 levels = malloc(count * sizeof(*levels), M_TEMP, M_NOWAIT);
860 if (levels == NULL)
861 return (ENOMEM);
862 error = CPUFREQ_LEVELS(sc->dev, levels, &count);
863 if (error) {
864 if (error == E2BIG)
865 printf("cpufreq: need to increase CF_MAX_LEVELS\n");
866 goto out;
867 }
868 if (count) {
869 for (i = 0; i < count; i++) {
870 set = &levels[i].total_set;
871 sbuf_printf(&sb, "%d/%d ", set->freq, set->power);
872 }
873 } else
874 sbuf_cpy(&sb, "0");
875 sbuf_trim(&sb);
876 sbuf_finish(&sb);
877 error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req);
878
879out:
880 free(levels, M_TEMP);
881 sbuf_delete(&sb);
882 return (error);
883}
884
885static int
886cpufreq_settings_sysctl(SYSCTL_HANDLER_ARGS)
887{
888 device_t dev;
889 struct cf_setting *sets;
890 struct sbuf sb;
891 int error, i, set_count;
892
893 dev = oidp->oid_arg1;
894 sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND);
895
896 /* Get settings from the device and generate the output string. */
897 set_count = MAX_SETTINGS;
898 sets = malloc(set_count * sizeof(*sets), M_TEMP, M_NOWAIT);
899 if (sets == NULL)
900 return (ENOMEM);
901 error = CPUFREQ_DRV_SETTINGS(dev, sets, &set_count);
902 if (error)
903 goto out;
904 if (set_count) {
905 for (i = 0; i < set_count; i++)
906 sbuf_printf(&sb, "%d/%d ", sets[i].freq, sets[i].power);
907 } else
908 sbuf_cpy(&sb, "0");
909 sbuf_trim(&sb);
910 sbuf_finish(&sb);
911 error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req);
912
913out:
914 free(sets, M_TEMP);
915 sbuf_delete(&sb);
916 return (error);
917}
918
919int
920cpufreq_register(device_t dev)
921{
922 struct cpufreq_softc *sc;
923 device_t cf_dev, cpu_dev;
924
925 /* Add a sysctl to get each driver's settings separately. */
926 SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
927 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
928 OID_AUTO, "freq_settings", CTLTYPE_STRING | CTLFLAG_RD, dev, 0,
929 cpufreq_settings_sysctl, "A", "CPU frequency driver settings");
930
931 /*
932 * Add only one cpufreq device to each CPU. Currently, all CPUs
933 * must offer the same levels and be switched at the same time.
934 */
935 cpu_dev = device_get_parent(dev);
936 if ((cf_dev = device_find_child(cpu_dev, "cpufreq", -1))) {
937 sc = device_get_softc(cf_dev);
938 sc->max_mhz = CPUFREQ_VAL_UNKNOWN;
939 return (0);
940 }
941
942 /* Add the child device and possibly sysctls. */
943 cf_dev = BUS_ADD_CHILD(cpu_dev, 0, "cpufreq", -1);
944 if (cf_dev == NULL)
945 return (ENOMEM);
946 device_quiet(cf_dev);
947
948 return (device_probe_and_attach(cf_dev));
949}
950
951int
952cpufreq_unregister(device_t dev)
953{
954 device_t cf_dev, *devs;
955 int cfcount, devcount, error, i, type;
956
957 /*
958 * If this is the last cpufreq child device, remove the control
959 * device as well. We identify cpufreq children by calling a method
960 * they support.
961 */
962 error = device_get_children(device_get_parent(dev), &devs, &devcount);
963 if (error)
964 return (error);
965 cf_dev = device_find_child(device_get_parent(dev), "cpufreq", -1);
966 if (cf_dev == NULL) {
967 device_printf(dev,
968 "warning: cpufreq_unregister called with no cpufreq device active\n");
969 return (0);
970 }
971 cfcount = 0;
972 for (i = 0; i < devcount; i++) {
973 if (!device_is_attached(devs[i]))
974 continue;
975 if (CPUFREQ_DRV_TYPE(devs[i], &type) == 0)
976 cfcount++;
977 }
978 if (cfcount <= 1)
979 device_delete_child(device_get_parent(cf_dev), cf_dev);
980 free(devs, M_TEMP);
981
982 return (0);
983}
| 783 return (fill);
784}
785
786static int
787cpufreq_curr_sysctl(SYSCTL_HANDLER_ARGS)
788{
789 struct cpufreq_softc *sc;
790 struct cf_level *levels;
791 int count, devcount, error, freq, i, n;
792 device_t *devs;
793
794 devs = NULL;
795 sc = oidp->oid_arg1;
796 levels = malloc(CF_MAX_LEVELS * sizeof(*levels), M_TEMP, M_NOWAIT);
797 if (levels == NULL)
798 return (ENOMEM);
799
800 error = CPUFREQ_GET(sc->dev, &levels[0]);
801 if (error)
802 goto out;
803 freq = levels[0].total_set.freq;
804 error = sysctl_handle_int(oidp, &freq, 0, req);
805 if (error != 0 || req->newptr == NULL)
806 goto out;
807
808 /*
809 * While we only call cpufreq_get() on one device (assuming all
810 * CPUs have equal levels), we call cpufreq_set() on all CPUs.
811 * This is needed for some MP systems.
812 */
813 error = devclass_get_devices(cpufreq_dc, &devs, &devcount);
814 if (error)
815 goto out;
816 for (n = 0; n < devcount; n++) {
817 count = CF_MAX_LEVELS;
818 error = CPUFREQ_LEVELS(devs[n], levels, &count);
819 if (error) {
820 if (error == E2BIG)
821 printf(
822 "cpufreq: need to increase CF_MAX_LEVELS\n");
823 break;
824 }
825 for (i = 0; i < count; i++) {
826 if (CPUFREQ_CMP(levels[i].total_set.freq, freq)) {
827 error = CPUFREQ_SET(devs[n], &levels[i],
828 CPUFREQ_PRIO_USER);
829 break;
830 }
831 }
832 if (i == count) {
833 error = EINVAL;
834 break;
835 }
836 }
837
838out:
839 if (devs)
840 free(devs, M_TEMP);
841 if (levels)
842 free(levels, M_TEMP);
843 return (error);
844}
845
846static int
847cpufreq_levels_sysctl(SYSCTL_HANDLER_ARGS)
848{
849 struct cpufreq_softc *sc;
850 struct cf_level *levels;
851 struct cf_setting *set;
852 struct sbuf sb;
853 int count, error, i;
854
855 sc = oidp->oid_arg1;
856 sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND);
857
858 /* Get settings from the device and generate the output string. */
859 count = CF_MAX_LEVELS;
860 levels = malloc(count * sizeof(*levels), M_TEMP, M_NOWAIT);
861 if (levels == NULL)
862 return (ENOMEM);
863 error = CPUFREQ_LEVELS(sc->dev, levels, &count);
864 if (error) {
865 if (error == E2BIG)
866 printf("cpufreq: need to increase CF_MAX_LEVELS\n");
867 goto out;
868 }
869 if (count) {
870 for (i = 0; i < count; i++) {
871 set = &levels[i].total_set;
872 sbuf_printf(&sb, "%d/%d ", set->freq, set->power);
873 }
874 } else
875 sbuf_cpy(&sb, "0");
876 sbuf_trim(&sb);
877 sbuf_finish(&sb);
878 error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req);
879
880out:
881 free(levels, M_TEMP);
882 sbuf_delete(&sb);
883 return (error);
884}
885
886static int
887cpufreq_settings_sysctl(SYSCTL_HANDLER_ARGS)
888{
889 device_t dev;
890 struct cf_setting *sets;
891 struct sbuf sb;
892 int error, i, set_count;
893
894 dev = oidp->oid_arg1;
895 sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND);
896
897 /* Get settings from the device and generate the output string. */
898 set_count = MAX_SETTINGS;
899 sets = malloc(set_count * sizeof(*sets), M_TEMP, M_NOWAIT);
900 if (sets == NULL)
901 return (ENOMEM);
902 error = CPUFREQ_DRV_SETTINGS(dev, sets, &set_count);
903 if (error)
904 goto out;
905 if (set_count) {
906 for (i = 0; i < set_count; i++)
907 sbuf_printf(&sb, "%d/%d ", sets[i].freq, sets[i].power);
908 } else
909 sbuf_cpy(&sb, "0");
910 sbuf_trim(&sb);
911 sbuf_finish(&sb);
912 error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req);
913
914out:
915 free(sets, M_TEMP);
916 sbuf_delete(&sb);
917 return (error);
918}
919
920int
921cpufreq_register(device_t dev)
922{
923 struct cpufreq_softc *sc;
924 device_t cf_dev, cpu_dev;
925
926 /* Add a sysctl to get each driver's settings separately. */
927 SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
928 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
929 OID_AUTO, "freq_settings", CTLTYPE_STRING | CTLFLAG_RD, dev, 0,
930 cpufreq_settings_sysctl, "A", "CPU frequency driver settings");
931
932 /*
933 * Add only one cpufreq device to each CPU. Currently, all CPUs
934 * must offer the same levels and be switched at the same time.
935 */
936 cpu_dev = device_get_parent(dev);
937 if ((cf_dev = device_find_child(cpu_dev, "cpufreq", -1))) {
938 sc = device_get_softc(cf_dev);
939 sc->max_mhz = CPUFREQ_VAL_UNKNOWN;
940 return (0);
941 }
942
943 /* Add the child device and possibly sysctls. */
944 cf_dev = BUS_ADD_CHILD(cpu_dev, 0, "cpufreq", -1);
945 if (cf_dev == NULL)
946 return (ENOMEM);
947 device_quiet(cf_dev);
948
949 return (device_probe_and_attach(cf_dev));
950}
951
952int
953cpufreq_unregister(device_t dev)
954{
955 device_t cf_dev, *devs;
956 int cfcount, devcount, error, i, type;
957
958 /*
959 * If this is the last cpufreq child device, remove the control
960 * device as well. We identify cpufreq children by calling a method
961 * they support.
962 */
963 error = device_get_children(device_get_parent(dev), &devs, &devcount);
964 if (error)
965 return (error);
966 cf_dev = device_find_child(device_get_parent(dev), "cpufreq", -1);
967 if (cf_dev == NULL) {
968 device_printf(dev,
969 "warning: cpufreq_unregister called with no cpufreq device active\n");
970 return (0);
971 }
972 cfcount = 0;
973 for (i = 0; i < devcount; i++) {
974 if (!device_is_attached(devs[i]))
975 continue;
976 if (CPUFREQ_DRV_TYPE(devs[i], &type) == 0)
977 cfcount++;
978 }
979 if (cfcount <= 1)
980 device_delete_child(device_get_parent(cf_dev), cf_dev);
981 free(devs, M_TEMP);
982
983 return (0);
984}
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