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-rw-r--r--drivers/acpi/Kconfig1
-rw-r--r--drivers/acpi/processor_idle.c608
2 files changed, 1 insertions, 608 deletions
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index d7f9839ba26..c5fc6efdc85 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -9,6 +9,7 @@ menuconfig ACPI
9 depends on PCI 9 depends on PCI
10 depends on PM 10 depends on PM
11 select PNP 11 select PNP
12 select CPU_IDLE
12 default y 13 default y
13 ---help--- 14 ---help---
14 Advanced Configuration and Power Interface (ACPI) support for 15 Advanced Configuration and Power Interface (ACPI) support for
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 7eab733ae96..7bc22a471fe 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -66,43 +66,17 @@ ACPI_MODULE_NAME("processor_idle");
66#define ACPI_PROCESSOR_FILE_POWER "power" 66#define ACPI_PROCESSOR_FILE_POWER "power"
67#define US_TO_PM_TIMER_TICKS(t) ((t * (PM_TIMER_FREQUENCY/1000)) / 1000) 67#define US_TO_PM_TIMER_TICKS(t) ((t * (PM_TIMER_FREQUENCY/1000)) / 1000)
68#define PM_TIMER_TICK_NS (1000000000ULL/PM_TIMER_FREQUENCY) 68#define PM_TIMER_TICK_NS (1000000000ULL/PM_TIMER_FREQUENCY)
69#ifndef CONFIG_CPU_IDLE
70#define C2_OVERHEAD 4 /* 1us (3.579 ticks per us) */
71#define C3_OVERHEAD 4 /* 1us (3.579 ticks per us) */
72static void (*pm_idle_save) (void) __read_mostly;
73#else
74#define C2_OVERHEAD 1 /* 1us */ 69#define C2_OVERHEAD 1 /* 1us */
75#define C3_OVERHEAD 1 /* 1us */ 70#define C3_OVERHEAD 1 /* 1us */
76#endif
77#define PM_TIMER_TICKS_TO_US(p) (((p) * 1000)/(PM_TIMER_FREQUENCY/1000)) 71#define PM_TIMER_TICKS_TO_US(p) (((p) * 1000)/(PM_TIMER_FREQUENCY/1000))
78 72
79static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER; 73static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER;
80#ifdef CONFIG_CPU_IDLE
81module_param(max_cstate, uint, 0000); 74module_param(max_cstate, uint, 0000);
82#else
83module_param(max_cstate, uint, 0644);
84#endif
85static unsigned int nocst __read_mostly; 75static unsigned int nocst __read_mostly;
86module_param(nocst, uint, 0000); 76module_param(nocst, uint, 0000);
87 77
88#ifndef CONFIG_CPU_IDLE
89/*
90 * bm_history -- bit-mask with a bit per jiffy of bus-master activity
91 * 1000 HZ: 0xFFFFFFFF: 32 jiffies = 32ms
92 * 800 HZ: 0xFFFFFFFF: 32 jiffies = 40ms
93 * 100 HZ: 0x0000000F: 4 jiffies = 40ms
94 * reduce history for more aggressive entry into C3
95 */
96static unsigned int bm_history __read_mostly =
97 (HZ >= 800 ? 0xFFFFFFFF : ((1U << (HZ / 25)) - 1));
98module_param(bm_history, uint, 0644);
99
100static int acpi_processor_set_power_policy(struct acpi_processor *pr);
101
102#else /* CONFIG_CPU_IDLE */
103static unsigned int latency_factor __read_mostly = 2; 78static unsigned int latency_factor __read_mostly = 2;
104module_param(latency_factor, uint, 0644); 79module_param(latency_factor, uint, 0644);
105#endif
106 80
107/* 81/*
108 * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3. 82 * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3.
@@ -224,51 +198,6 @@ static void acpi_safe_halt(void)
224 current_thread_info()->status |= TS_POLLING; 198 current_thread_info()->status |= TS_POLLING;
225} 199}
226 200
227#ifndef CONFIG_CPU_IDLE
228
229static void
230acpi_processor_power_activate(struct acpi_processor *pr,
231 struct acpi_processor_cx *new)
232{
233 struct acpi_processor_cx *old;
234
235 if (!pr || !new)
236 return;
237
238 old = pr->power.state;
239
240 if (old)
241 old->promotion.count = 0;
242 new->demotion.count = 0;
243
244 pr->power.state = new;
245
246 return;
247}
248
249static atomic_t c3_cpu_count;
250
251/* Common C-state entry for C2, C3, .. */
252static void acpi_cstate_enter(struct acpi_processor_cx *cstate)
253{
254 /* Don't trace irqs off for idle */
255 stop_critical_timings();
256 if (cstate->entry_method == ACPI_CSTATE_FFH) {
257 /* Call into architectural FFH based C-state */
258 acpi_processor_ffh_cstate_enter(cstate);
259 } else {
260 int unused;
261 /* IO port based C-state */
262 inb(cstate->address);
263 /* Dummy wait op - must do something useless after P_LVL2 read
264 because chipsets cannot guarantee that STPCLK# signal
265 gets asserted in time to freeze execution properly. */
266 unused = inl(acpi_gbl_FADT.xpm_timer_block.address);
267 }
268 start_critical_timings();
269}
270#endif /* !CONFIG_CPU_IDLE */
271
272#ifdef ARCH_APICTIMER_STOPS_ON_C3 201#ifdef ARCH_APICTIMER_STOPS_ON_C3
273 202
274/* 203/*
@@ -370,421 +299,6 @@ static int tsc_halts_in_c(int state)
370} 299}
371#endif 300#endif
372 301
373#ifndef CONFIG_CPU_IDLE
374static void acpi_processor_idle(void)
375{
376 struct acpi_processor *pr = NULL;
377 struct acpi_processor_cx *cx = NULL;
378 struct acpi_processor_cx *next_state = NULL;
379 int sleep_ticks = 0;
380 u32 t1, t2 = 0;
381
382 /*
383 * Interrupts must be disabled during bus mastering calculations and
384 * for C2/C3 transitions.
385 */
386 local_irq_disable();
387
388 pr = __get_cpu_var(processors);
389 if (!pr) {
390 local_irq_enable();
391 return;
392 }
393
394 /*
395 * Check whether we truly need to go idle, or should
396 * reschedule:
397 */
398 if (unlikely(need_resched())) {
399 local_irq_enable();
400 return;
401 }
402
403 cx = pr->power.state;
404 if (!cx || acpi_idle_suspend) {
405 if (pm_idle_save) {
406 pm_idle_save(); /* enables IRQs */
407 } else {
408 acpi_safe_halt();
409 local_irq_enable();
410 }
411
412 return;
413 }
414
415 /*
416 * Check BM Activity
417 * -----------------
418 * Check for bus mastering activity (if required), record, and check
419 * for demotion.
420 */
421 if (pr->flags.bm_check) {
422 u32 bm_status = 0;
423 unsigned long diff = jiffies - pr->power.bm_check_timestamp;
424
425 if (diff > 31)
426 diff = 31;
427
428 pr->power.bm_activity <<= diff;
429
430 acpi_get_register_unlocked(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status);
431 if (bm_status) {
432 pr->power.bm_activity |= 0x1;
433 acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS, 1);
434 }
435 /*
436 * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect
437 * the true state of bus mastering activity; forcing us to
438 * manually check the BMIDEA bit of each IDE channel.
439 */
440 else if (errata.piix4.bmisx) {
441 if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01)
442 || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01))
443 pr->power.bm_activity |= 0x1;
444 }
445
446 pr->power.bm_check_timestamp = jiffies;
447
448 /*
449 * If bus mastering is or was active this jiffy, demote
450 * to avoid a faulty transition. Note that the processor
451 * won't enter a low-power state during this call (to this
452 * function) but should upon the next.
453 *
454 * TBD: A better policy might be to fallback to the demotion
455 * state (use it for this quantum only) istead of
456 * demoting -- and rely on duration as our sole demotion
457 * qualification. This may, however, introduce DMA
458 * issues (e.g. floppy DMA transfer overrun/underrun).
459 */
460 if ((pr->power.bm_activity & 0x1) &&
461 cx->demotion.threshold.bm) {
462 local_irq_enable();
463 next_state = cx->demotion.state;
464 goto end;
465 }
466 }
467
468#ifdef CONFIG_HOTPLUG_CPU
469 /*
470 * Check for P_LVL2_UP flag before entering C2 and above on
471 * an SMP system. We do it here instead of doing it at _CST/P_LVL
472 * detection phase, to work cleanly with logical CPU hotplug.
473 */
474 if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) &&
475 !pr->flags.has_cst && !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED))
476 cx = &pr->power.states[ACPI_STATE_C1];
477#endif
478
479 /*
480 * Sleep:
481 * ------
482 * Invoke the current Cx state to put the processor to sleep.
483 */
484 if (cx->type == ACPI_STATE_C2 || cx->type == ACPI_STATE_C3) {
485 current_thread_info()->status &= ~TS_POLLING;
486 /*
487 * TS_POLLING-cleared state must be visible before we
488 * test NEED_RESCHED:
489 */
490 smp_mb();
491 if (need_resched()) {
492 current_thread_info()->status |= TS_POLLING;
493 local_irq_enable();
494 return;
495 }
496 }
497
498 switch (cx->type) {
499
500 case ACPI_STATE_C1:
501 /*
502 * Invoke C1.
503 * Use the appropriate idle routine, the one that would
504 * be used without acpi C-states.
505 */
506 if (pm_idle_save) {
507 pm_idle_save(); /* enables IRQs */
508 } else {
509 acpi_safe_halt();
510 local_irq_enable();
511 }
512
513 /*
514 * TBD: Can't get time duration while in C1, as resumes
515 * go to an ISR rather than here. Need to instrument
516 * base interrupt handler.
517 *
518 * Note: the TSC better not stop in C1, sched_clock() will
519 * skew otherwise.
520 */
521 sleep_ticks = 0xFFFFFFFF;
522
523 break;
524
525 case ACPI_STATE_C2:
526 /* Get start time (ticks) */
527 t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
528 /* Tell the scheduler that we are going deep-idle: */
529 sched_clock_idle_sleep_event();
530 /* Invoke C2 */
531 acpi_state_timer_broadcast(pr, cx, 1);
532 acpi_cstate_enter(cx);
533 /* Get end time (ticks) */
534 t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
535
536#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
537 /* TSC halts in C2, so notify users */
538 if (tsc_halts_in_c(ACPI_STATE_C2))
539 mark_tsc_unstable("possible TSC halt in C2");
540#endif
541 /* Compute time (ticks) that we were actually asleep */
542 sleep_ticks = ticks_elapsed(t1, t2);
543
544 /* Tell the scheduler how much we idled: */
545 sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS);
546
547 /* Re-enable interrupts */
548 local_irq_enable();
549 /* Do not account our idle-switching overhead: */
550 sleep_ticks -= cx->latency_ticks + C2_OVERHEAD;
551
552 current_thread_info()->status |= TS_POLLING;
553 acpi_state_timer_broadcast(pr, cx, 0);
554 break;
555
556 case ACPI_STATE_C3:
557 acpi_unlazy_tlb(smp_processor_id());
558 /*
559 * Must be done before busmaster disable as we might
560 * need to access HPET !
561 */
562 acpi_state_timer_broadcast(pr, cx, 1);
563 /*
564 * disable bus master
565 * bm_check implies we need ARB_DIS
566 * !bm_check implies we need cache flush
567 * bm_control implies whether we can do ARB_DIS
568 *
569 * That leaves a case where bm_check is set and bm_control is
570 * not set. In that case we cannot do much, we enter C3
571 * without doing anything.
572 */
573 if (pr->flags.bm_check && pr->flags.bm_control) {
574 if (atomic_inc_return(&c3_cpu_count) ==
575 num_online_cpus()) {
576 /*
577 * All CPUs are trying to go to C3
578 * Disable bus master arbitration
579 */
580 acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1);
581 }
582 } else if (!pr->flags.bm_check) {
583 /* SMP with no shared cache... Invalidate cache */
584 ACPI_FLUSH_CPU_CACHE();
585 }
586
587 /* Get start time (ticks) */
588 t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
589 /* Invoke C3 */
590 /* Tell the scheduler that we are going deep-idle: */
591 sched_clock_idle_sleep_event();
592 acpi_cstate_enter(cx);
593 /* Get end time (ticks) */
594 t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
595 if (pr->flags.bm_check && pr->flags.bm_control) {
596 /* Enable bus master arbitration */
597 atomic_dec(&c3_cpu_count);
598 acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0);
599 }
600
601#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
602 /* TSC halts in C3, so notify users */
603 if (tsc_halts_in_c(ACPI_STATE_C3))
604 mark_tsc_unstable("TSC halts in C3");
605#endif
606 /* Compute time (ticks) that we were actually asleep */
607 sleep_ticks = ticks_elapsed(t1, t2);
608 /* Tell the scheduler how much we idled: */
609 sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS);
610
611 /* Re-enable interrupts */
612 local_irq_enable();
613 /* Do not account our idle-switching overhead: */
614 sleep_ticks -= cx->latency_ticks + C3_OVERHEAD;
615
616 current_thread_info()->status |= TS_POLLING;
617 acpi_state_timer_broadcast(pr, cx, 0);
618 break;
619
620 default:
621 local_irq_enable();
622 return;
623 }
624 cx->usage++;
625 if ((cx->type != ACPI_STATE_C1) && (sleep_ticks > 0))
626 cx->time += sleep_ticks;
627
628 next_state = pr->power.state;
629
630#ifdef CONFIG_HOTPLUG_CPU
631 /* Don't do promotion/demotion */
632 if ((cx->type == ACPI_STATE_C1) && (num_online_cpus() > 1) &&
633 !pr->flags.has_cst && !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED)) {
634 next_state = cx;
635 goto end;
636 }
637#endif
638
639 /*
640 * Promotion?
641 * ----------
642 * Track the number of longs (time asleep is greater than threshold)
643 * and promote when the count threshold is reached. Note that bus
644 * mastering activity may prevent promotions.
645 * Do not promote above max_cstate.
646 */
647 if (cx->promotion.state &&
648 ((cx->promotion.state - pr->power.states) <= max_cstate)) {
649 if (sleep_ticks > cx->promotion.threshold.ticks &&
650 cx->promotion.state->latency <=
651 pm_qos_requirement(PM_QOS_CPU_DMA_LATENCY)) {
652 cx->promotion.count++;
653 cx->demotion.count = 0;
654 if (cx->promotion.count >=
655 cx->promotion.threshold.count) {
656 if (pr->flags.bm_check) {
657 if (!
658 (pr->power.bm_activity & cx->
659 promotion.threshold.bm)) {
660 next_state =
661 cx->promotion.state;
662 goto end;
663 }
664 } else {
665 next_state = cx->promotion.state;
666 goto end;
667 }
668 }
669 }
670 }
671
672 /*
673 * Demotion?
674 * ---------
675 * Track the number of shorts (time asleep is less than time threshold)
676 * and demote when the usage threshold is reached.
677 */
678 if (cx->demotion.state) {
679 if (sleep_ticks < cx->demotion.threshold.ticks) {
680 cx->demotion.count++;
681 cx->promotion.count = 0;
682 if (cx->demotion.count >= cx->demotion.threshold.count) {
683 next_state = cx->demotion.state;
684 goto end;
685 }
686 }
687 }
688
689 end:
690 /*
691 * Demote if current state exceeds max_cstate
692 * or if the latency of the current state is unacceptable
693 */
694 if ((pr->power.state - pr->power.states) > max_cstate ||
695 pr->power.state->latency >
696 pm_qos_requirement(PM_QOS_CPU_DMA_LATENCY)) {
697 if (cx->demotion.state)
698 next_state = cx->demotion.state;
699 }
700
701 /*
702 * New Cx State?
703 * -------------
704 * If we're going to start using a new Cx state we must clean up
705 * from the previous and prepare to use the new.
706 */
707 if (next_state != pr->power.state)
708 acpi_processor_power_activate(pr, next_state);
709}
710
711static int acpi_processor_set_power_policy(struct acpi_processor *pr)
712{
713 unsigned int i;
714 unsigned int state_is_set = 0;
715 struct acpi_processor_cx *lower = NULL;
716 struct acpi_processor_cx *higher = NULL;
717 struct acpi_processor_cx *cx;
718
719
720 if (!pr)
721 return -EINVAL;
722
723 /*
724 * This function sets the default Cx state policy (OS idle handler).
725 * Our scheme is to promote quickly to C2 but more conservatively
726 * to C3. We're favoring C2 for its characteristics of low latency
727 * (quick response), good power savings, and ability to allow bus
728 * mastering activity. Note that the Cx state policy is completely
729 * customizable and can be altered dynamically.
730 */
731
732 /* startup state */
733 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
734 cx = &pr->power.states[i];
735 if (!cx->valid)
736 continue;
737
738 if (!state_is_set)
739 pr->power.state = cx;
740 state_is_set++;
741 break;
742 }
743
744 if (!state_is_set)
745 return -ENODEV;
746
747 /* demotion */
748 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
749 cx = &pr->power.states[i];
750 if (!cx->valid)
751 continue;
752
753 if (lower) {
754 cx->demotion.state = lower;
755 cx->demotion.threshold.ticks = cx->latency_ticks;
756 cx->demotion.threshold.count = 1;
757 if (cx->type == ACPI_STATE_C3)
758 cx->demotion.threshold.bm = bm_history;
759 }
760
761 lower = cx;
762 }
763
764 /* promotion */
765 for (i = (ACPI_PROCESSOR_MAX_POWER - 1); i > 0; i--) {
766 cx = &pr->power.states[i];
767 if (!cx->valid)
768 continue;
769
770 if (higher) {
771 cx->promotion.state = higher;
772 cx->promotion.threshold.ticks = cx->latency_ticks;
773 if (cx->type >= ACPI_STATE_C2)
774 cx->promotion.threshold.count = 4;
775 else
776 cx->promotion.threshold.count = 10;
777 if (higher->type == ACPI_STATE_C3)
778 cx->promotion.threshold.bm = bm_history;
779 }
780
781 higher = cx;
782 }
783
784 return 0;
785}
786#endif /* !CONFIG_CPU_IDLE */
787
788static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr) 302static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr)
789{ 303{
790 304
@@ -1027,11 +541,7 @@ static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx)
1027 */ 541 */
1028 cx->valid = 1; 542 cx->valid = 1;
1029 543
1030#ifndef CONFIG_CPU_IDLE
1031 cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency);
1032#else
1033 cx->latency_ticks = cx->latency; 544 cx->latency_ticks = cx->latency;
1034#endif
1035 545
1036 return; 546 return;
1037} 547}
@@ -1111,11 +621,7 @@ static void acpi_processor_power_verify_c3(struct acpi_processor *pr,
1111 */ 621 */
1112 cx->valid = 1; 622 cx->valid = 1;
1113 623
1114#ifndef CONFIG_CPU_IDLE
1115 cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency);
1116#else
1117 cx->latency_ticks = cx->latency; 624 cx->latency_ticks = cx->latency;
1118#endif
1119 /* 625 /*
1120 * On older chipsets, BM_RLD needs to be set 626 * On older chipsets, BM_RLD needs to be set
1121 * in order for Bus Master activity to wake the 627 * in order for Bus Master activity to wake the
@@ -1189,20 +695,6 @@ static int acpi_processor_get_power_info(struct acpi_processor *pr)
1189 695
1190 pr->power.count = acpi_processor_power_verify(pr); 696 pr->power.count = acpi_processor_power_verify(pr);
1191 697
1192#ifndef CONFIG_CPU_IDLE
1193 /*
1194 * Set Default Policy
1195 * ------------------
1196 * Now that we know which states are supported, set the default
1197 * policy. Note that this policy can be changed dynamically
1198 * (e.g. encourage deeper sleeps to conserve battery life when
1199 * not on AC).
1200 */
1201 result = acpi_processor_set_power_policy(pr);
1202 if (result)
1203 return result;
1204#endif
1205
1206 /* 698 /*
1207 * if one state of type C2 or C3 is available, mark this 699 * if one state of type C2 or C3 is available, mark this
1208 * CPU as being "idle manageable" 700 * CPU as being "idle manageable"
@@ -1300,69 +792,6 @@ static const struct file_operations acpi_processor_power_fops = {
1300 .release = single_release, 792 .release = single_release,
1301}; 793};
1302 794
1303#ifndef CONFIG_CPU_IDLE
1304
1305int acpi_processor_cst_has_changed(struct acpi_processor *pr)
1306{
1307 int result = 0;
1308
1309 if (boot_option_idle_override)
1310 return 0;
1311
1312 if (!pr)
1313 return -EINVAL;
1314
1315 if (nocst) {
1316 return -ENODEV;
1317 }
1318
1319 if (!pr->flags.power_setup_done)
1320 return -ENODEV;
1321
1322 /*
1323 * Fall back to the default idle loop, when pm_idle_save had
1324 * been initialized.
1325 */
1326 if (pm_idle_save) {
1327 pm_idle = pm_idle_save;
1328 /* Relies on interrupts forcing exit from idle. */
1329 synchronize_sched();
1330 }
1331
1332 pr->flags.power = 0;
1333 result = acpi_processor_get_power_info(pr);
1334 if ((pr->flags.power == 1) && (pr->flags.power_setup_done))
1335 pm_idle = acpi_processor_idle;
1336
1337 return result;
1338}
1339
1340#ifdef CONFIG_SMP
1341static void smp_callback(void *v)
1342{
1343 /* we already woke the CPU up, nothing more to do */
1344}
1345
1346/*
1347 * This function gets called when a part of the kernel has a new latency
1348 * requirement. This means we need to get all processors out of their C-state,
1349 * and then recalculate a new suitable C-state. Just do a cross-cpu IPI; that
1350 * wakes them all right up.
1351 */
1352static int acpi_processor_latency_notify(struct notifier_block *b,
1353 unsigned long l, void *v)
1354{
1355 smp_call_function(smp_callback, NULL, 1);
1356 return NOTIFY_OK;
1357}
1358
1359static struct notifier_block acpi_processor_latency_notifier = {
1360 .notifier_call = acpi_processor_latency_notify,
1361};
1362
1363#endif
1364
1365#else /* CONFIG_CPU_IDLE */
1366 795
1367/** 796/**
1368 * acpi_idle_bm_check - checks if bus master activity was detected 797 * acpi_idle_bm_check - checks if bus master activity was detected
@@ -1756,8 +1185,6 @@ int acpi_processor_cst_has_changed(struct acpi_processor *pr)
1756 return ret; 1185 return ret;
1757} 1186}
1758 1187
1759#endif /* CONFIG_CPU_IDLE */
1760
1761int __cpuinit acpi_processor_power_init(struct acpi_processor *pr, 1188int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
1762 struct acpi_device *device) 1189 struct acpi_device *device)
1763{ 1190{
@@ -1786,10 +1213,6 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
1786 "ACPI: processor limited to max C-state %d\n", 1213 "ACPI: processor limited to max C-state %d\n",
1787 max_cstate); 1214 max_cstate);
1788 first_run++; 1215 first_run++;
1789#if !defined(CONFIG_CPU_IDLE) && defined(CONFIG_SMP)
1790 pm_qos_add_notifier(PM_QOS_CPU_DMA_LATENCY,
1791 &acpi_processor_latency_notifier);
1792#endif
1793 } 1216 }
1794 1217
1795 if (!pr) 1218 if (!pr)
@@ -1813,11 +1236,9 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
1813 * platforms that only support C1. 1236 * platforms that only support C1.
1814 */ 1237 */
1815 if (pr->flags.power) { 1238 if (pr->flags.power) {
1816#ifdef CONFIG_CPU_IDLE
1817 acpi_processor_setup_cpuidle(pr); 1239 acpi_processor_setup_cpuidle(pr);
1818 if (cpuidle_register_device(&pr->power.dev)) 1240 if (cpuidle_register_device(&pr->power.dev))
1819 return -EIO; 1241 return -EIO;
1820#endif
1821 1242
1822 printk(KERN_INFO PREFIX "CPU%d (power states:", pr->id); 1243 printk(KERN_INFO PREFIX "CPU%d (power states:", pr->id);
1823 for (i = 1; i <= pr->power.count; i++) 1244 for (i = 1; i <= pr->power.count; i++)
@@ -1825,13 +1246,6 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
1825 printk(" C%d[C%d]", i, 1246 printk(" C%d[C%d]", i,
1826 pr->power.states[i].type); 1247 pr->power.states[i].type);
1827 printk(")\n"); 1248 printk(")\n");
1828
1829#ifndef CONFIG_CPU_IDLE
1830 if (pr->id == 0) {
1831 pm_idle_save = pm_idle;
1832 pm_idle = acpi_processor_idle;
1833 }
1834#endif
1835 } 1249 }
1836 1250
1837 /* 'power' [R] */ 1251 /* 'power' [R] */
@@ -1850,34 +1264,12 @@ int acpi_processor_power_exit(struct acpi_processor *pr,
1850 if (boot_option_idle_override) 1264 if (boot_option_idle_override)
1851 return 0; 1265 return 0;
1852 1266
1853#ifdef CONFIG_CPU_IDLE
1854 cpuidle_unregister_device(&pr->power.dev); 1267 cpuidle_unregister_device(&pr->power.dev);
1855#endif
1856 pr->flags.power_setup_done = 0; 1268 pr->flags.power_setup_done = 0;
1857 1269
1858 if (acpi_device_dir(device)) 1270 if (acpi_device_dir(device))
1859 remove_proc_entry(ACPI_PROCESSOR_FILE_POWER, 1271 remove_proc_entry(ACPI_PROCESSOR_FILE_POWER,
1860 acpi_device_dir(device)); 1272 acpi_device_dir(device));
1861 1273
1862#ifndef CONFIG_CPU_IDLE
1863
1864 /* Unregister the idle handler when processor #0 is removed. */
1865 if (pr->id == 0) {
1866 if (pm_idle_save)
1867 pm_idle = pm_idle_save;
1868
1869 /*
1870 * We are about to unload the current idle thread pm callback
1871 * (pm_idle), Wait for all processors to update cached/local
1872 * copies of pm_idle before proceeding.
1873 */
1874 cpu_idle_wait();
1875#ifdef CONFIG_SMP
1876 pm_qos_remove_notifier(PM_QOS_CPU_DMA_LATENCY,
1877 &acpi_processor_latency_notifier);
1878#endif
1879 }
1880#endif
1881
1882 return 0; 1274 return 0;
1883} 1275}
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-17 08:28:05 -0400