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