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12
13#define pr_fmt(fmt) "ACPI: " fmt
14
15#include <linux/module.h>
16#include <linux/acpi.h>
17#include <linux/dmi.h>
18#include <linux/sched.h>
19#include <linux/sort.h>
20#include <linux/tick.h>
21#include <linux/cpuidle.h>
22#include <linux/cpu.h>
23#include <acpi/processor.h>
24
25
26
27
28
29
30
31#ifdef CONFIG_X86
32#include <asm/apic.h>
33#include <asm/cpu.h>
34#endif
35
36#define ACPI_IDLE_STATE_START (IS_ENABLED(CONFIG_ARCH_HAS_CPU_RELAX) ? 1 : 0)
37
38static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER;
39module_param(max_cstate, uint, 0000);
40static unsigned int nocst __read_mostly;
41module_param(nocst, uint, 0000);
42static int bm_check_disable __read_mostly;
43module_param(bm_check_disable, uint, 0000);
44
45static unsigned int latency_factor __read_mostly = 2;
46module_param(latency_factor, uint, 0644);
47
48static DEFINE_PER_CPU(struct cpuidle_device *, acpi_cpuidle_device);
49
50struct cpuidle_driver acpi_idle_driver = {
51 .name = "acpi_idle",
52 .owner = THIS_MODULE,
53};
54
55#ifdef CONFIG_ACPI_PROCESSOR_CSTATE
56static
57DEFINE_PER_CPU(struct acpi_processor_cx * [CPUIDLE_STATE_MAX], acpi_cstate);
58
59static int disabled_by_idle_boot_param(void)
60{
61 return boot_option_idle_override == IDLE_POLL ||
62 boot_option_idle_override == IDLE_HALT;
63}
64
65
66
67
68
69
70
71static int set_max_cstate(const struct dmi_system_id *id)
72{
73 if (max_cstate > ACPI_PROCESSOR_MAX_POWER)
74 return 0;
75
76 pr_notice("%s detected - limiting to C%ld max_cstate."
77 " Override with \"processor.max_cstate=%d\"\n", id->ident,
78 (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1);
79
80 max_cstate = (long)id->driver_data;
81
82 return 0;
83}
84
85static const struct dmi_system_id processor_power_dmi_table[] = {
86 { set_max_cstate, "Clevo 5600D", {
87 DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
88 DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")},
89 (void *)2},
90 { set_max_cstate, "Pavilion zv5000", {
91 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
92 DMI_MATCH(DMI_PRODUCT_NAME,"Pavilion zv5000 (DS502A#ABA)")},
93 (void *)1},
94 { set_max_cstate, "Asus L8400B", {
95 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
96 DMI_MATCH(DMI_PRODUCT_NAME,"L8400B series Notebook PC")},
97 (void *)1},
98 {},
99};
100
101
102
103
104
105
106static void __cpuidle acpi_safe_halt(void)
107{
108 if (!tif_need_resched()) {
109 safe_halt();
110 local_irq_disable();
111 }
112}
113
114#ifdef ARCH_APICTIMER_STOPS_ON_C3
115
116
117
118
119
120
121
122static void lapic_timer_check_state(int state, struct acpi_processor *pr,
123 struct acpi_processor_cx *cx)
124{
125 struct acpi_processor_power *pwr = &pr->power;
126 u8 type = local_apic_timer_c2_ok ? ACPI_STATE_C3 : ACPI_STATE_C2;
127
128 if (cpu_has(&cpu_data(pr->id), X86_FEATURE_ARAT))
129 return;
130
131 if (boot_cpu_has_bug(X86_BUG_AMD_APIC_C1E))
132 type = ACPI_STATE_C1;
133
134
135
136
137
138 if (pwr->timer_broadcast_on_state < state)
139 return;
140
141 if (cx->type >= type)
142 pr->power.timer_broadcast_on_state = state;
143}
144
145static void __lapic_timer_propagate_broadcast(void *arg)
146{
147 struct acpi_processor *pr = (struct acpi_processor *) arg;
148
149 if (pr->power.timer_broadcast_on_state < INT_MAX)
150 tick_broadcast_enable();
151 else
152 tick_broadcast_disable();
153}
154
155static void lapic_timer_propagate_broadcast(struct acpi_processor *pr)
156{
157 smp_call_function_single(pr->id, __lapic_timer_propagate_broadcast,
158 (void *)pr, 1);
159}
160
161
162static bool lapic_timer_needs_broadcast(struct acpi_processor *pr,
163 struct acpi_processor_cx *cx)
164{
165 return cx - pr->power.states >= pr->power.timer_broadcast_on_state;
166}
167
168#else
169
170static void lapic_timer_check_state(int state, struct acpi_processor *pr,
171 struct acpi_processor_cx *cstate) { }
172static void lapic_timer_propagate_broadcast(struct acpi_processor *pr) { }
173
174static bool lapic_timer_needs_broadcast(struct acpi_processor *pr,
175 struct acpi_processor_cx *cx)
176{
177 return false;
178}
179
180#endif
181
182#if defined(CONFIG_X86)
183static void tsc_check_state(int state)
184{
185 switch (boot_cpu_data.x86_vendor) {
186 case X86_VENDOR_HYGON:
187 case X86_VENDOR_AMD:
188 case X86_VENDOR_INTEL:
189 case X86_VENDOR_CENTAUR:
190 case X86_VENDOR_ZHAOXIN:
191
192
193
194
195 if (boot_cpu_has(X86_FEATURE_NONSTOP_TSC))
196 return;
197 fallthrough;
198 default:
199
200 if (state > ACPI_STATE_C1)
201 mark_tsc_unstable("TSC halts in idle");
202 }
203}
204#else
205static void tsc_check_state(int state) { return; }
206#endif
207
208static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr)
209{
210
211 if (!pr->pblk)
212 return -ENODEV;
213
214
215 pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2;
216 pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3;
217
218#ifndef CONFIG_HOTPLUG_CPU
219
220
221
222
223 if ((num_online_cpus() > 1) &&
224 !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED))
225 return -ENODEV;
226#endif
227
228
229 pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4;
230 pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5;
231
232
233 pr->power.states[ACPI_STATE_C2].latency = acpi_gbl_FADT.c2_latency;
234 pr->power.states[ACPI_STATE_C3].latency = acpi_gbl_FADT.c3_latency;
235
236
237
238
239
240 if (acpi_gbl_FADT.c2_latency > ACPI_PROCESSOR_MAX_C2_LATENCY) {
241 acpi_handle_debug(pr->handle, "C2 latency too large [%d]\n",
242 acpi_gbl_FADT.c2_latency);
243
244 pr->power.states[ACPI_STATE_C2].address = 0;
245 }
246
247
248
249
250
251 if (acpi_gbl_FADT.c3_latency > ACPI_PROCESSOR_MAX_C3_LATENCY) {
252 acpi_handle_debug(pr->handle, "C3 latency too large [%d]\n",
253 acpi_gbl_FADT.c3_latency);
254
255 pr->power.states[ACPI_STATE_C3].address = 0;
256 }
257
258 acpi_handle_debug(pr->handle, "lvl2[0x%08x] lvl3[0x%08x]\n",
259 pr->power.states[ACPI_STATE_C2].address,
260 pr->power.states[ACPI_STATE_C3].address);
261
262 snprintf(pr->power.states[ACPI_STATE_C2].desc,
263 ACPI_CX_DESC_LEN, "ACPI P_LVL2 IOPORT 0x%x",
264 pr->power.states[ACPI_STATE_C2].address);
265 snprintf(pr->power.states[ACPI_STATE_C3].desc,
266 ACPI_CX_DESC_LEN, "ACPI P_LVL3 IOPORT 0x%x",
267 pr->power.states[ACPI_STATE_C3].address);
268
269 return 0;
270}
271
272static int acpi_processor_get_power_info_default(struct acpi_processor *pr)
273{
274 if (!pr->power.states[ACPI_STATE_C1].valid) {
275
276
277 pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1;
278 pr->power.states[ACPI_STATE_C1].valid = 1;
279 pr->power.states[ACPI_STATE_C1].entry_method = ACPI_CSTATE_HALT;
280
281 snprintf(pr->power.states[ACPI_STATE_C1].desc,
282 ACPI_CX_DESC_LEN, "ACPI HLT");
283 }
284
285 pr->power.states[ACPI_STATE_C0].valid = 1;
286 return 0;
287}
288
289static int acpi_processor_get_power_info_cst(struct acpi_processor *pr)
290{
291 int ret;
292
293 if (nocst)
294 return -ENODEV;
295
296 ret = acpi_processor_evaluate_cst(pr->handle, pr->id, &pr->power);
297 if (ret)
298 return ret;
299
300 if (!pr->power.count)
301 return -EFAULT;
302
303 pr->flags.has_cst = 1;
304 return 0;
305}
306
307static void acpi_processor_power_verify_c3(struct acpi_processor *pr,
308 struct acpi_processor_cx *cx)
309{
310 static int bm_check_flag = -1;
311 static int bm_control_flag = -1;
312
313
314 if (!cx->address)
315 return;
316
317
318
319
320
321
322
323
324 else if (errata.piix4.fdma) {
325 acpi_handle_debug(pr->handle,
326 "C3 not supported on PIIX4 with Type-F DMA\n");
327 return;
328 }
329
330
331 if (bm_check_flag == -1) {
332
333 acpi_processor_power_init_bm_check(&(pr->flags), pr->id);
334 bm_check_flag = pr->flags.bm_check;
335 bm_control_flag = pr->flags.bm_control;
336 } else {
337 pr->flags.bm_check = bm_check_flag;
338 pr->flags.bm_control = bm_control_flag;
339 }
340
341 if (pr->flags.bm_check) {
342 if (!pr->flags.bm_control) {
343 if (pr->flags.has_cst != 1) {
344
345 acpi_handle_debug(pr->handle,
346 "C3 support requires BM control\n");
347 return;
348 } else {
349
350 acpi_handle_debug(pr->handle,
351 "C3 support without BM control\n");
352 }
353 }
354 } else {
355
356
357
358
359 if (!(acpi_gbl_FADT.flags & ACPI_FADT_WBINVD)) {
360 acpi_handle_debug(pr->handle,
361 "Cache invalidation should work properly"
362 " for C3 to be enabled on SMP systems\n");
363 return;
364 }
365 }
366
367
368
369
370
371
372
373 cx->valid = 1;
374
375
376
377
378
379
380
381
382
383 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, 1);
384
385 return;
386}
387
388static int acpi_cst_latency_cmp(const void *a, const void *b)
389{
390 const struct acpi_processor_cx *x = a, *y = b;
391
392 if (!(x->valid && y->valid))
393 return 0;
394 if (x->latency > y->latency)
395 return 1;
396 if (x->latency < y->latency)
397 return -1;
398 return 0;
399}
400static void acpi_cst_latency_swap(void *a, void *b, int n)
401{
402 struct acpi_processor_cx *x = a, *y = b;
403 u32 tmp;
404
405 if (!(x->valid && y->valid))
406 return;
407 tmp = x->latency;
408 x->latency = y->latency;
409 y->latency = tmp;
410}
411
412static int acpi_processor_power_verify(struct acpi_processor *pr)
413{
414 unsigned int i;
415 unsigned int working = 0;
416 unsigned int last_latency = 0;
417 unsigned int last_type = 0;
418 bool buggy_latency = false;
419
420 pr->power.timer_broadcast_on_state = INT_MAX;
421
422 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
423 struct acpi_processor_cx *cx = &pr->power.states[i];
424
425 switch (cx->type) {
426 case ACPI_STATE_C1:
427 cx->valid = 1;
428 break;
429
430 case ACPI_STATE_C2:
431 if (!cx->address)
432 break;
433 cx->valid = 1;
434 break;
435
436 case ACPI_STATE_C3:
437 acpi_processor_power_verify_c3(pr, cx);
438 break;
439 }
440 if (!cx->valid)
441 continue;
442 if (cx->type >= last_type && cx->latency < last_latency)
443 buggy_latency = true;
444 last_latency = cx->latency;
445 last_type = cx->type;
446
447 lapic_timer_check_state(i, pr, cx);
448 tsc_check_state(cx->type);
449 working++;
450 }
451
452 if (buggy_latency) {
453 pr_notice("FW issue: working around C-state latencies out of order\n");
454 sort(&pr->power.states[1], max_cstate,
455 sizeof(struct acpi_processor_cx),
456 acpi_cst_latency_cmp,
457 acpi_cst_latency_swap);
458 }
459
460 lapic_timer_propagate_broadcast(pr);
461
462 return (working);
463}
464
465static int acpi_processor_get_cstate_info(struct acpi_processor *pr)
466{
467 unsigned int i;
468 int result;
469
470
471
472
473
474
475 memset(pr->power.states, 0, sizeof(pr->power.states));
476
477 result = acpi_processor_get_power_info_cst(pr);
478 if (result == -ENODEV)
479 result = acpi_processor_get_power_info_fadt(pr);
480
481 if (result)
482 return result;
483
484 acpi_processor_get_power_info_default(pr);
485
486 pr->power.count = acpi_processor_power_verify(pr);
487
488
489
490
491
492 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
493 if (pr->power.states[i].valid) {
494 pr->power.count = i;
495 pr->flags.power = 1;
496 }
497 }
498
499 return 0;
500}
501
502
503
504
505static int acpi_idle_bm_check(void)
506{
507 u32 bm_status = 0;
508
509 if (bm_check_disable)
510 return 0;
511
512 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status);
513 if (bm_status)
514 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, 1);
515
516
517
518
519
520 else if (errata.piix4.bmisx) {
521 if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01)
522 || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01))
523 bm_status = 1;
524 }
525 return bm_status;
526}
527
528static void wait_for_freeze(void)
529{
530#ifdef CONFIG_X86
531
532 if (boot_cpu_has(X86_FEATURE_HYPERVISOR))
533 return;
534#endif
535
536
537
538 inl(acpi_gbl_FADT.xpm_timer_block.address);
539}
540
541
542
543
544
545
546
547static void __cpuidle acpi_idle_do_entry(struct acpi_processor_cx *cx)
548{
549 if (cx->entry_method == ACPI_CSTATE_FFH) {
550
551 acpi_processor_ffh_cstate_enter(cx);
552 } else if (cx->entry_method == ACPI_CSTATE_HALT) {
553 acpi_safe_halt();
554 } else {
555
556 inb(cx->address);
557 wait_for_freeze();
558 }
559}
560
561
562
563
564
565
566static int acpi_idle_play_dead(struct cpuidle_device *dev, int index)
567{
568 struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu);
569
570 ACPI_FLUSH_CPU_CACHE();
571
572 while (1) {
573
574 if (cx->entry_method == ACPI_CSTATE_HALT)
575 safe_halt();
576 else if (cx->entry_method == ACPI_CSTATE_SYSTEMIO) {
577 inb(cx->address);
578 wait_for_freeze();
579 } else
580 return -ENODEV;
581
582#if defined(CONFIG_X86) && defined(CONFIG_HOTPLUG_CPU)
583 cond_wakeup_cpu0();
584#endif
585 }
586
587
588 return 0;
589}
590
591static bool acpi_idle_fallback_to_c1(struct acpi_processor *pr)
592{
593 return IS_ENABLED(CONFIG_HOTPLUG_CPU) && !pr->flags.has_cst &&
594 !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED);
595}
596
597static int c3_cpu_count;
598static DEFINE_RAW_SPINLOCK(c3_lock);
599
600
601
602
603
604
605
606
607static int acpi_idle_enter_bm(struct cpuidle_driver *drv,
608 struct acpi_processor *pr,
609 struct acpi_processor_cx *cx,
610 int index)
611{
612 static struct acpi_processor_cx safe_cx = {
613 .entry_method = ACPI_CSTATE_HALT,
614 };
615
616
617
618
619
620
621
622
623
624 bool dis_bm = pr->flags.bm_control;
625
626
627 if (!cx->bm_sts_skip && acpi_idle_bm_check()) {
628 dis_bm = false;
629 index = drv->safe_state_index;
630 if (index >= 0) {
631 cx = this_cpu_read(acpi_cstate[index]);
632 } else {
633 cx = &safe_cx;
634 index = -EBUSY;
635 }
636 }
637
638 if (dis_bm) {
639 raw_spin_lock(&c3_lock);
640 c3_cpu_count++;
641
642 if (c3_cpu_count == num_online_cpus())
643 acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 1);
644 raw_spin_unlock(&c3_lock);
645 }
646
647 rcu_idle_enter();
648
649 acpi_idle_do_entry(cx);
650
651 rcu_idle_exit();
652
653
654 if (dis_bm) {
655 raw_spin_lock(&c3_lock);
656 acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0);
657 c3_cpu_count--;
658 raw_spin_unlock(&c3_lock);
659 }
660
661 return index;
662}
663
664static int acpi_idle_enter(struct cpuidle_device *dev,
665 struct cpuidle_driver *drv, int index)
666{
667 struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu);
668 struct acpi_processor *pr;
669
670 pr = __this_cpu_read(processors);
671 if (unlikely(!pr))
672 return -EINVAL;
673
674 if (cx->type != ACPI_STATE_C1) {
675 if (cx->type == ACPI_STATE_C3 && pr->flags.bm_check)
676 return acpi_idle_enter_bm(drv, pr, cx, index);
677
678
679 if (acpi_idle_fallback_to_c1(pr) && num_online_cpus() > 1) {
680 index = ACPI_IDLE_STATE_START;
681 cx = per_cpu(acpi_cstate[index], dev->cpu);
682 }
683 }
684
685 if (cx->type == ACPI_STATE_C3)
686 ACPI_FLUSH_CPU_CACHE();
687
688 acpi_idle_do_entry(cx);
689
690 return index;
691}
692
693static int acpi_idle_enter_s2idle(struct cpuidle_device *dev,
694 struct cpuidle_driver *drv, int index)
695{
696 struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu);
697
698 if (cx->type == ACPI_STATE_C3) {
699 struct acpi_processor *pr = __this_cpu_read(processors);
700
701 if (unlikely(!pr))
702 return 0;
703
704 if (pr->flags.bm_check) {
705 u8 bm_sts_skip = cx->bm_sts_skip;
706
707
708 cx->bm_sts_skip = 1;
709 acpi_idle_enter_bm(drv, pr, cx, index);
710 cx->bm_sts_skip = bm_sts_skip;
711
712 return 0;
713 } else {
714 ACPI_FLUSH_CPU_CACHE();
715 }
716 }
717 acpi_idle_do_entry(cx);
718
719 return 0;
720}
721
722static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr,
723 struct cpuidle_device *dev)
724{
725 int i, count = ACPI_IDLE_STATE_START;
726 struct acpi_processor_cx *cx;
727 struct cpuidle_state *state;
728
729 if (max_cstate == 0)
730 max_cstate = 1;
731
732 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
733 state = &acpi_idle_driver.states[count];
734 cx = &pr->power.states[i];
735
736 if (!cx->valid)
737 continue;
738
739 per_cpu(acpi_cstate[count], dev->cpu) = cx;
740
741 if (lapic_timer_needs_broadcast(pr, cx))
742 state->flags |= CPUIDLE_FLAG_TIMER_STOP;
743
744 if (cx->type == ACPI_STATE_C3) {
745 state->flags |= CPUIDLE_FLAG_TLB_FLUSHED;
746 if (pr->flags.bm_check)
747 state->flags |= CPUIDLE_FLAG_RCU_IDLE;
748 }
749
750 count++;
751 if (count == CPUIDLE_STATE_MAX)
752 break;
753 }
754
755 if (!count)
756 return -EINVAL;
757
758 return 0;
759}
760
761static int acpi_processor_setup_cstates(struct acpi_processor *pr)
762{
763 int i, count;
764 struct acpi_processor_cx *cx;
765 struct cpuidle_state *state;
766 struct cpuidle_driver *drv = &acpi_idle_driver;
767
768 if (max_cstate == 0)
769 max_cstate = 1;
770
771 if (IS_ENABLED(CONFIG_ARCH_HAS_CPU_RELAX)) {
772 cpuidle_poll_state_init(drv);
773 count = 1;
774 } else {
775 count = 0;
776 }
777
778 for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
779 cx = &pr->power.states[i];
780
781 if (!cx->valid)
782 continue;
783
784 state = &drv->states[count];
785 snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i);
786 strlcpy(state->desc, cx->desc, CPUIDLE_DESC_LEN);
787 state->exit_latency = cx->latency;
788 state->target_residency = cx->latency * latency_factor;
789 state->enter = acpi_idle_enter;
790
791 state->flags = 0;
792 if (cx->type == ACPI_STATE_C1 || cx->type == ACPI_STATE_C2) {
793 state->enter_dead = acpi_idle_play_dead;
794 drv->safe_state_index = count;
795 }
796
797
798
799
800
801
802
803 if (cx->type != ACPI_STATE_C1 && !acpi_idle_fallback_to_c1(pr))
804 state->enter_s2idle = acpi_idle_enter_s2idle;
805
806 count++;
807 if (count == CPUIDLE_STATE_MAX)
808 break;
809 }
810
811 drv->state_count = count;
812
813 if (!count)
814 return -EINVAL;
815
816 return 0;
817}
818
819static inline void acpi_processor_cstate_first_run_checks(void)
820{
821 static int first_run;
822
823 if (first_run)
824 return;
825 dmi_check_system(processor_power_dmi_table);
826 max_cstate = acpi_processor_cstate_check(max_cstate);
827 if (max_cstate < ACPI_C_STATES_MAX)
828 pr_notice("processor limited to max C-state %d\n", max_cstate);
829
830 first_run++;
831
832 if (nocst)
833 return;
834
835 acpi_processor_claim_cst_control();
836}
837#else
838
839static inline int disabled_by_idle_boot_param(void) { return 0; }
840static inline void acpi_processor_cstate_first_run_checks(void) { }
841static int acpi_processor_get_cstate_info(struct acpi_processor *pr)
842{
843 return -ENODEV;
844}
845
846static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr,
847 struct cpuidle_device *dev)
848{
849 return -EINVAL;
850}
851
852static int acpi_processor_setup_cstates(struct acpi_processor *pr)
853{
854 return -EINVAL;
855}
856
857#endif
858
859struct acpi_lpi_states_array {
860 unsigned int size;
861 unsigned int composite_states_size;
862 struct acpi_lpi_state *entries;
863 struct acpi_lpi_state *composite_states[ACPI_PROCESSOR_MAX_POWER];
864};
865
866static int obj_get_integer(union acpi_object *obj, u32 *value)
867{
868 if (obj->type != ACPI_TYPE_INTEGER)
869 return -EINVAL;
870
871 *value = obj->integer.value;
872 return 0;
873}
874
875static int acpi_processor_evaluate_lpi(acpi_handle handle,
876 struct acpi_lpi_states_array *info)
877{
878 acpi_status status;
879 int ret = 0;
880 int pkg_count, state_idx = 1, loop;
881 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
882 union acpi_object *lpi_data;
883 struct acpi_lpi_state *lpi_state;
884
885 status = acpi_evaluate_object(handle, "_LPI", NULL, &buffer);
886 if (ACPI_FAILURE(status)) {
887 acpi_handle_debug(handle, "No _LPI, giving up\n");
888 return -ENODEV;
889 }
890
891 lpi_data = buffer.pointer;
892
893
894 if (!lpi_data || lpi_data->type != ACPI_TYPE_PACKAGE ||
895 lpi_data->package.count < 4) {
896 pr_debug("not enough elements in _LPI\n");
897 ret = -ENODATA;
898 goto end;
899 }
900
901 pkg_count = lpi_data->package.elements[2].integer.value;
902
903
904 if (pkg_count < 1 || pkg_count != lpi_data->package.count - 3) {
905 pr_debug("count given by _LPI is not valid\n");
906 ret = -ENODATA;
907 goto end;
908 }
909
910 lpi_state = kcalloc(pkg_count, sizeof(*lpi_state), GFP_KERNEL);
911 if (!lpi_state) {
912 ret = -ENOMEM;
913 goto end;
914 }
915
916 info->size = pkg_count;
917 info->entries = lpi_state;
918
919
920 for (loop = 3; state_idx <= pkg_count; loop++, state_idx++, lpi_state++) {
921 union acpi_object *element, *pkg_elem, *obj;
922
923 element = &lpi_data->package.elements[loop];
924 if (element->type != ACPI_TYPE_PACKAGE || element->package.count < 7)
925 continue;
926
927 pkg_elem = element->package.elements;
928
929 obj = pkg_elem + 6;
930 if (obj->type == ACPI_TYPE_BUFFER) {
931 struct acpi_power_register *reg;
932
933 reg = (struct acpi_power_register *)obj->buffer.pointer;
934 if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO &&
935 reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)
936 continue;
937
938 lpi_state->address = reg->address;
939 lpi_state->entry_method =
940 reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE ?
941 ACPI_CSTATE_FFH : ACPI_CSTATE_SYSTEMIO;
942 } else if (obj->type == ACPI_TYPE_INTEGER) {
943 lpi_state->entry_method = ACPI_CSTATE_INTEGER;
944 lpi_state->address = obj->integer.value;
945 } else {
946 continue;
947 }
948
949
950
951 obj = pkg_elem + 9;
952 if (obj->type == ACPI_TYPE_STRING)
953 strlcpy(lpi_state->desc, obj->string.pointer,
954 ACPI_CX_DESC_LEN);
955
956 lpi_state->index = state_idx;
957 if (obj_get_integer(pkg_elem + 0, &lpi_state->min_residency)) {
958 pr_debug("No min. residency found, assuming 10 us\n");
959 lpi_state->min_residency = 10;
960 }
961
962 if (obj_get_integer(pkg_elem + 1, &lpi_state->wake_latency)) {
963 pr_debug("No wakeup residency found, assuming 10 us\n");
964 lpi_state->wake_latency = 10;
965 }
966
967 if (obj_get_integer(pkg_elem + 2, &lpi_state->flags))
968 lpi_state->flags = 0;
969
970 if (obj_get_integer(pkg_elem + 3, &lpi_state->arch_flags))
971 lpi_state->arch_flags = 0;
972
973 if (obj_get_integer(pkg_elem + 4, &lpi_state->res_cnt_freq))
974 lpi_state->res_cnt_freq = 1;
975
976 if (obj_get_integer(pkg_elem + 5, &lpi_state->enable_parent_state))
977 lpi_state->enable_parent_state = 0;
978 }
979
980 acpi_handle_debug(handle, "Found %d power states\n", state_idx);
981end:
982 kfree(buffer.pointer);
983 return ret;
984}
985
986
987
988
989static int flat_state_cnt;
990
991
992
993
994
995
996
997
998static bool combine_lpi_states(struct acpi_lpi_state *local,
999 struct acpi_lpi_state *parent,
1000 struct acpi_lpi_state *result)
1001{
1002 if (parent->entry_method == ACPI_CSTATE_INTEGER) {
1003 if (!parent->address)
1004 return false;
1005 result->address = local->address + parent->address;
1006 } else {
1007 result->address = parent->address;
1008 }
1009
1010 result->min_residency = max(local->min_residency, parent->min_residency);
1011 result->wake_latency = local->wake_latency + parent->wake_latency;
1012 result->enable_parent_state = parent->enable_parent_state;
1013 result->entry_method = local->entry_method;
1014
1015 result->flags = parent->flags;
1016 result->arch_flags = parent->arch_flags;
1017 result->index = parent->index;
1018
1019 strlcpy(result->desc, local->desc, ACPI_CX_DESC_LEN);
1020 strlcat(result->desc, "+", ACPI_CX_DESC_LEN);
1021 strlcat(result->desc, parent->desc, ACPI_CX_DESC_LEN);
1022 return true;
1023}
1024
1025#define ACPI_LPI_STATE_FLAGS_ENABLED BIT(0)
1026
1027static void stash_composite_state(struct acpi_lpi_states_array *curr_level,
1028 struct acpi_lpi_state *t)
1029{
1030 curr_level->composite_states[curr_level->composite_states_size++] = t;
1031}
1032
1033static int flatten_lpi_states(struct acpi_processor *pr,
1034 struct acpi_lpi_states_array *curr_level,
1035 struct acpi_lpi_states_array *prev_level)
1036{
1037 int i, j, state_count = curr_level->size;
1038 struct acpi_lpi_state *p, *t = curr_level->entries;
1039
1040 curr_level->composite_states_size = 0;
1041 for (j = 0; j < state_count; j++, t++) {
1042 struct acpi_lpi_state *flpi;
1043
1044 if (!(t->flags & ACPI_LPI_STATE_FLAGS_ENABLED))
1045 continue;
1046
1047 if (flat_state_cnt >= ACPI_PROCESSOR_MAX_POWER) {
1048 pr_warn("Limiting number of LPI states to max (%d)\n",
1049 ACPI_PROCESSOR_MAX_POWER);
1050 pr_warn("Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n");
1051 break;
1052 }
1053
1054 flpi = &pr->power.lpi_states[flat_state_cnt];
1055
1056 if (!prev_level) {
1057 memcpy(flpi, t, sizeof(*t));
1058 stash_composite_state(curr_level, flpi);
1059 flat_state_cnt++;
1060 continue;
1061 }
1062
1063 for (i = 0; i < prev_level->composite_states_size; i++) {
1064 p = prev_level->composite_states[i];
1065 if (t->index <= p->enable_parent_state &&
1066 combine_lpi_states(p, t, flpi)) {
1067 stash_composite_state(curr_level, flpi);
1068 flat_state_cnt++;
1069 flpi++;
1070 }
1071 }
1072 }
1073
1074 kfree(curr_level->entries);
1075 return 0;
1076}
1077
1078static int acpi_processor_get_lpi_info(struct acpi_processor *pr)
1079{
1080 int ret, i;
1081 acpi_status status;
1082 acpi_handle handle = pr->handle, pr_ahandle;
1083 struct acpi_device *d = NULL;
1084 struct acpi_lpi_states_array info[2], *tmp, *prev, *curr;
1085
1086 if (!osc_pc_lpi_support_confirmed)
1087 return -EOPNOTSUPP;
1088
1089 if (!acpi_has_method(handle, "_LPI"))
1090 return -EINVAL;
1091
1092 flat_state_cnt = 0;
1093 prev = &info[0];
1094 curr = &info[1];
1095 handle = pr->handle;
1096 ret = acpi_processor_evaluate_lpi(handle, prev);
1097 if (ret)
1098 return ret;
1099 flatten_lpi_states(pr, prev, NULL);
1100
1101 status = acpi_get_parent(handle, &pr_ahandle);
1102 while (ACPI_SUCCESS(status)) {
1103 acpi_bus_get_device(pr_ahandle, &d);
1104 handle = pr_ahandle;
1105
1106 if (strcmp(acpi_device_hid(d), ACPI_PROCESSOR_CONTAINER_HID))
1107 break;
1108
1109
1110 if (!acpi_has_method(handle, "_LPI"))
1111 break;
1112
1113 ret = acpi_processor_evaluate_lpi(handle, curr);
1114 if (ret)
1115 break;
1116
1117
1118 flatten_lpi_states(pr, curr, prev);
1119
1120 tmp = prev, prev = curr, curr = tmp;
1121
1122 status = acpi_get_parent(handle, &pr_ahandle);
1123 }
1124
1125 pr->power.count = flat_state_cnt;
1126
1127 for (i = 0; i < pr->power.count; i++)
1128 pr->power.lpi_states[i].index = i;
1129
1130
1131 pr->flags.has_lpi = 1;
1132 pr->flags.power = 1;
1133
1134 return 0;
1135}
1136
1137int __weak acpi_processor_ffh_lpi_probe(unsigned int cpu)
1138{
1139 return -ENODEV;
1140}
1141
1142int __weak acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi)
1143{
1144 return -ENODEV;
1145}
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155static int acpi_idle_lpi_enter(struct cpuidle_device *dev,
1156 struct cpuidle_driver *drv, int index)
1157{
1158 struct acpi_processor *pr;
1159 struct acpi_lpi_state *lpi;
1160
1161 pr = __this_cpu_read(processors);
1162
1163 if (unlikely(!pr))
1164 return -EINVAL;
1165
1166 lpi = &pr->power.lpi_states[index];
1167 if (lpi->entry_method == ACPI_CSTATE_FFH)
1168 return acpi_processor_ffh_lpi_enter(lpi);
1169
1170 return -EINVAL;
1171}
1172
1173static int acpi_processor_setup_lpi_states(struct acpi_processor *pr)
1174{
1175 int i;
1176 struct acpi_lpi_state *lpi;
1177 struct cpuidle_state *state;
1178 struct cpuidle_driver *drv = &acpi_idle_driver;
1179
1180 if (!pr->flags.has_lpi)
1181 return -EOPNOTSUPP;
1182
1183 for (i = 0; i < pr->power.count && i < CPUIDLE_STATE_MAX; i++) {
1184 lpi = &pr->power.lpi_states[i];
1185
1186 state = &drv->states[i];
1187 snprintf(state->name, CPUIDLE_NAME_LEN, "LPI-%d", i);
1188 strlcpy(state->desc, lpi->desc, CPUIDLE_DESC_LEN);
1189 state->exit_latency = lpi->wake_latency;
1190 state->target_residency = lpi->min_residency;
1191 if (lpi->arch_flags)
1192 state->flags |= CPUIDLE_FLAG_TIMER_STOP;
1193 state->enter = acpi_idle_lpi_enter;
1194 drv->safe_state_index = i;
1195 }
1196
1197 drv->state_count = i;
1198
1199 return 0;
1200}
1201
1202
1203
1204
1205
1206
1207
1208static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr)
1209{
1210 int i;
1211 struct cpuidle_driver *drv = &acpi_idle_driver;
1212
1213 if (!pr->flags.power_setup_done || !pr->flags.power)
1214 return -EINVAL;
1215
1216 drv->safe_state_index = -1;
1217 for (i = ACPI_IDLE_STATE_START; i < CPUIDLE_STATE_MAX; i++) {
1218 drv->states[i].name[0] = '\0';
1219 drv->states[i].desc[0] = '\0';
1220 }
1221
1222 if (pr->flags.has_lpi)
1223 return acpi_processor_setup_lpi_states(pr);
1224
1225 return acpi_processor_setup_cstates(pr);
1226}
1227
1228
1229
1230
1231
1232
1233
1234
1235static int acpi_processor_setup_cpuidle_dev(struct acpi_processor *pr,
1236 struct cpuidle_device *dev)
1237{
1238 if (!pr->flags.power_setup_done || !pr->flags.power || !dev)
1239 return -EINVAL;
1240
1241 dev->cpu = pr->id;
1242 if (pr->flags.has_lpi)
1243 return acpi_processor_ffh_lpi_probe(pr->id);
1244
1245 return acpi_processor_setup_cpuidle_cx(pr, dev);
1246}
1247
1248static int acpi_processor_get_power_info(struct acpi_processor *pr)
1249{
1250 int ret;
1251
1252 ret = acpi_processor_get_lpi_info(pr);
1253 if (ret)
1254 ret = acpi_processor_get_cstate_info(pr);
1255
1256 return ret;
1257}
1258
1259int acpi_processor_hotplug(struct acpi_processor *pr)
1260{
1261 int ret = 0;
1262 struct cpuidle_device *dev;
1263
1264 if (disabled_by_idle_boot_param())
1265 return 0;
1266
1267 if (!pr->flags.power_setup_done)
1268 return -ENODEV;
1269
1270 dev = per_cpu(acpi_cpuidle_device, pr->id);
1271 cpuidle_pause_and_lock();
1272 cpuidle_disable_device(dev);
1273 ret = acpi_processor_get_power_info(pr);
1274 if (!ret && pr->flags.power) {
1275 acpi_processor_setup_cpuidle_dev(pr, dev);
1276 ret = cpuidle_enable_device(dev);
1277 }
1278 cpuidle_resume_and_unlock();
1279
1280 return ret;
1281}
1282
1283int acpi_processor_power_state_has_changed(struct acpi_processor *pr)
1284{
1285 int cpu;
1286 struct acpi_processor *_pr;
1287 struct cpuidle_device *dev;
1288
1289 if (disabled_by_idle_boot_param())
1290 return 0;
1291
1292 if (!pr->flags.power_setup_done)
1293 return -ENODEV;
1294
1295
1296
1297
1298
1299
1300
1301 if (pr->id == 0 && cpuidle_get_driver() == &acpi_idle_driver) {
1302
1303
1304 cpus_read_lock();
1305 cpuidle_pause_and_lock();
1306
1307
1308 for_each_online_cpu(cpu) {
1309 _pr = per_cpu(processors, cpu);
1310 if (!_pr || !_pr->flags.power_setup_done)
1311 continue;
1312 dev = per_cpu(acpi_cpuidle_device, cpu);
1313 cpuidle_disable_device(dev);
1314 }
1315
1316
1317 acpi_processor_get_power_info(pr);
1318 acpi_processor_setup_cpuidle_states(pr);
1319
1320
1321 for_each_online_cpu(cpu) {
1322 _pr = per_cpu(processors, cpu);
1323 if (!_pr || !_pr->flags.power_setup_done)
1324 continue;
1325 acpi_processor_get_power_info(_pr);
1326 if (_pr->flags.power) {
1327 dev = per_cpu(acpi_cpuidle_device, cpu);
1328 acpi_processor_setup_cpuidle_dev(_pr, dev);
1329 cpuidle_enable_device(dev);
1330 }
1331 }
1332 cpuidle_resume_and_unlock();
1333 cpus_read_unlock();
1334 }
1335
1336 return 0;
1337}
1338
1339static int acpi_processor_registered;
1340
1341int acpi_processor_power_init(struct acpi_processor *pr)
1342{
1343 int retval;
1344 struct cpuidle_device *dev;
1345
1346 if (disabled_by_idle_boot_param())
1347 return 0;
1348
1349 acpi_processor_cstate_first_run_checks();
1350
1351 if (!acpi_processor_get_power_info(pr))
1352 pr->flags.power_setup_done = 1;
1353
1354
1355
1356
1357
1358
1359 if (pr->flags.power) {
1360
1361 if (!acpi_processor_registered) {
1362 acpi_processor_setup_cpuidle_states(pr);
1363 retval = cpuidle_register_driver(&acpi_idle_driver);
1364 if (retval)
1365 return retval;
1366 pr_debug("%s registered with cpuidle\n",
1367 acpi_idle_driver.name);
1368 }
1369
1370 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1371 if (!dev)
1372 return -ENOMEM;
1373 per_cpu(acpi_cpuidle_device, pr->id) = dev;
1374
1375 acpi_processor_setup_cpuidle_dev(pr, dev);
1376
1377
1378
1379
1380 retval = cpuidle_register_device(dev);
1381 if (retval) {
1382 if (acpi_processor_registered == 0)
1383 cpuidle_unregister_driver(&acpi_idle_driver);
1384 return retval;
1385 }
1386 acpi_processor_registered++;
1387 }
1388 return 0;
1389}
1390
1391int acpi_processor_power_exit(struct acpi_processor *pr)
1392{
1393 struct cpuidle_device *dev = per_cpu(acpi_cpuidle_device, pr->id);
1394
1395 if (disabled_by_idle_boot_param())
1396 return 0;
1397
1398 if (pr->flags.power) {
1399 cpuidle_unregister_device(dev);
1400 acpi_processor_registered--;
1401 if (acpi_processor_registered == 0)
1402 cpuidle_unregister_driver(&acpi_idle_driver);
1403 }
1404
1405 pr->flags.power_setup_done = 0;
1406 return 0;
1407}
1408