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11
12#define pr_fmt(fmt) "ACPI: " fmt
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/slab.h>
17#include <linux/init.h>
18#include <linux/sched.h>
19#include <linux/cpufreq.h>
20#include <linux/acpi.h>
21#include <acpi/processor.h>
22#include <asm/io.h>
23#include <linux/uaccess.h>
24
25
26
27
28
29static int ignore_tpc;
30module_param(ignore_tpc, int, 0644);
31MODULE_PARM_DESC(ignore_tpc, "Disable broken BIOS _TPC throttling support");
32
33struct throttling_tstate {
34 unsigned int cpu;
35 int target_state;
36};
37
38struct acpi_processor_throttling_arg {
39 struct acpi_processor *pr;
40 int target_state;
41 bool force;
42};
43
44#define THROTTLING_PRECHANGE (1)
45#define THROTTLING_POSTCHANGE (2)
46
47static int acpi_processor_get_throttling(struct acpi_processor *pr);
48static int __acpi_processor_set_throttling(struct acpi_processor *pr,
49 int state, bool force, bool direct);
50
51static int acpi_processor_update_tsd_coord(void)
52{
53 int count, count_target;
54 int retval = 0;
55 unsigned int i, j;
56 cpumask_var_t covered_cpus;
57 struct acpi_processor *pr, *match_pr;
58 struct acpi_tsd_package *pdomain, *match_pdomain;
59 struct acpi_processor_throttling *pthrottling, *match_pthrottling;
60
61 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
62 return -ENOMEM;
63
64
65
66
67
68 for_each_possible_cpu(i) {
69 pr = per_cpu(processors, i);
70 if (!pr)
71 continue;
72
73
74 pthrottling = &(pr->throttling);
75
76
77
78
79
80
81 if (!pthrottling->tsd_valid_flag) {
82 retval = -EINVAL;
83 break;
84 }
85 }
86 if (retval)
87 goto err_ret;
88
89 for_each_possible_cpu(i) {
90 pr = per_cpu(processors, i);
91 if (!pr)
92 continue;
93
94 if (cpumask_test_cpu(i, covered_cpus))
95 continue;
96 pthrottling = &pr->throttling;
97
98 pdomain = &(pthrottling->domain_info);
99 cpumask_set_cpu(i, pthrottling->shared_cpu_map);
100 cpumask_set_cpu(i, covered_cpus);
101
102
103
104
105 if (pdomain->num_processors <= 1)
106 continue;
107
108
109 count_target = pdomain->num_processors;
110 count = 1;
111
112 for_each_possible_cpu(j) {
113 if (i == j)
114 continue;
115
116 match_pr = per_cpu(processors, j);
117 if (!match_pr)
118 continue;
119
120 match_pthrottling = &(match_pr->throttling);
121 match_pdomain = &(match_pthrottling->domain_info);
122 if (match_pdomain->domain != pdomain->domain)
123 continue;
124
125
126
127
128
129
130
131 if (match_pdomain->num_processors != count_target) {
132 retval = -EINVAL;
133 goto err_ret;
134 }
135
136 if (pdomain->coord_type != match_pdomain->coord_type) {
137 retval = -EINVAL;
138 goto err_ret;
139 }
140
141 cpumask_set_cpu(j, covered_cpus);
142 cpumask_set_cpu(j, pthrottling->shared_cpu_map);
143 count++;
144 }
145 for_each_possible_cpu(j) {
146 if (i == j)
147 continue;
148
149 match_pr = per_cpu(processors, j);
150 if (!match_pr)
151 continue;
152
153 match_pthrottling = &(match_pr->throttling);
154 match_pdomain = &(match_pthrottling->domain_info);
155 if (match_pdomain->domain != pdomain->domain)
156 continue;
157
158
159
160
161
162 cpumask_copy(match_pthrottling->shared_cpu_map,
163 pthrottling->shared_cpu_map);
164 }
165 }
166
167err_ret:
168 free_cpumask_var(covered_cpus);
169
170 for_each_possible_cpu(i) {
171 pr = per_cpu(processors, i);
172 if (!pr)
173 continue;
174
175
176
177
178
179 if (retval) {
180 pthrottling = &(pr->throttling);
181 cpumask_clear(pthrottling->shared_cpu_map);
182 cpumask_set_cpu(i, pthrottling->shared_cpu_map);
183 pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL;
184 }
185 }
186
187 return retval;
188}
189
190
191
192
193
194void acpi_processor_throttling_init(void)
195{
196 if (acpi_processor_update_tsd_coord())
197 pr_debug("Assume no T-state coordination\n");
198}
199
200static int acpi_processor_throttling_notifier(unsigned long event, void *data)
201{
202 struct throttling_tstate *p_tstate = data;
203 struct acpi_processor *pr;
204 unsigned int cpu;
205 int target_state;
206 struct acpi_processor_limit *p_limit;
207 struct acpi_processor_throttling *p_throttling;
208
209 cpu = p_tstate->cpu;
210 pr = per_cpu(processors, cpu);
211 if (!pr) {
212 pr_debug("Invalid pr pointer\n");
213 return 0;
214 }
215 if (!pr->flags.throttling) {
216 acpi_handle_debug(pr->handle,
217 "Throttling control unsupported on CPU %d\n",
218 cpu);
219 return 0;
220 }
221 target_state = p_tstate->target_state;
222 p_throttling = &(pr->throttling);
223 switch (event) {
224 case THROTTLING_PRECHANGE:
225
226
227
228
229 p_limit = &pr->limit;
230 if (p_limit->thermal.tx > target_state)
231 target_state = p_limit->thermal.tx;
232 if (p_limit->user.tx > target_state)
233 target_state = p_limit->user.tx;
234 if (pr->throttling_platform_limit > target_state)
235 target_state = pr->throttling_platform_limit;
236 if (target_state >= p_throttling->state_count) {
237 pr_warn("Exceed the limit of T-state \n");
238 target_state = p_throttling->state_count - 1;
239 }
240 p_tstate->target_state = target_state;
241 acpi_handle_debug(pr->handle,
242 "PreChange Event: target T-state of CPU %d is T%d\n",
243 cpu, target_state);
244 break;
245 case THROTTLING_POSTCHANGE:
246
247
248
249
250 p_throttling->state = target_state;
251 acpi_handle_debug(pr->handle,
252 "PostChange Event: CPU %d is switched to T%d\n",
253 cpu, target_state);
254 break;
255 default:
256 pr_warn("Unsupported Throttling notifier event\n");
257 break;
258 }
259
260 return 0;
261}
262
263
264
265
266static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
267{
268 acpi_status status = 0;
269 unsigned long long tpc = 0;
270
271 if (!pr)
272 return -EINVAL;
273
274 if (ignore_tpc)
275 goto end;
276
277 status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc);
278 if (ACPI_FAILURE(status)) {
279 if (status != AE_NOT_FOUND)
280 acpi_evaluation_failure_warn(pr->handle, "_TPC", status);
281
282 return -ENODEV;
283 }
284
285end:
286 pr->throttling_platform_limit = (int)tpc;
287 return 0;
288}
289
290int acpi_processor_tstate_has_changed(struct acpi_processor *pr)
291{
292 int result = 0;
293 int throttling_limit;
294 int current_state;
295 struct acpi_processor_limit *limit;
296 int target_state;
297
298 if (ignore_tpc)
299 return 0;
300
301 result = acpi_processor_get_platform_limit(pr);
302 if (result) {
303
304 return result;
305 }
306
307 throttling_limit = pr->throttling_platform_limit;
308 if (throttling_limit >= pr->throttling.state_count) {
309
310 return -EINVAL;
311 }
312
313 current_state = pr->throttling.state;
314 if (current_state > throttling_limit) {
315
316
317
318
319
320
321
322 limit = &pr->limit;
323 target_state = throttling_limit;
324 if (limit->thermal.tx > target_state)
325 target_state = limit->thermal.tx;
326 if (limit->user.tx > target_state)
327 target_state = limit->user.tx;
328 } else if (current_state == throttling_limit) {
329
330
331
332 return 0;
333 } else {
334
335
336
337
338
339
340
341 target_state = throttling_limit;
342 }
343 return acpi_processor_set_throttling(pr, target_state, false);
344}
345
346
347
348
349
350
351
352
353
354
355void acpi_processor_reevaluate_tstate(struct acpi_processor *pr,
356 bool is_dead)
357{
358 int result = 0;
359
360 if (is_dead) {
361
362
363
364 pr->flags.throttling = 0;
365 return;
366 }
367
368
369
370 if (!pr->throttling.state_count) {
371
372
373
374 pr->flags.throttling = 0;
375 return;
376 }
377 pr->flags.throttling = 1;
378
379
380
381
382
383
384 result = acpi_processor_get_throttling(pr);
385 if (result)
386 goto end;
387
388 if (pr->throttling.state) {
389 result = acpi_processor_set_throttling(pr, 0, false);
390 if (result)
391 goto end;
392 }
393
394end:
395 if (result)
396 pr->flags.throttling = 0;
397}
398
399
400
401static int acpi_processor_get_throttling_control(struct acpi_processor *pr)
402{
403 int result = 0;
404 acpi_status status = 0;
405 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
406 union acpi_object *ptc = NULL;
407 union acpi_object obj;
408 struct acpi_processor_throttling *throttling;
409
410 status = acpi_evaluate_object(pr->handle, "_PTC", NULL, &buffer);
411 if (ACPI_FAILURE(status)) {
412 if (status != AE_NOT_FOUND)
413 acpi_evaluation_failure_warn(pr->handle, "_PTC", status);
414
415 return -ENODEV;
416 }
417
418 ptc = (union acpi_object *)buffer.pointer;
419 if (!ptc || (ptc->type != ACPI_TYPE_PACKAGE)
420 || (ptc->package.count != 2)) {
421 pr_err("Invalid _PTC data\n");
422 result = -EFAULT;
423 goto end;
424 }
425
426
427
428
429
430 obj = ptc->package.elements[0];
431
432 if ((obj.type != ACPI_TYPE_BUFFER)
433 || (obj.buffer.length < sizeof(struct acpi_ptc_register))
434 || (obj.buffer.pointer == NULL)) {
435 pr_err("Invalid _PTC data (control_register)\n");
436 result = -EFAULT;
437 goto end;
438 }
439 memcpy(&pr->throttling.control_register, obj.buffer.pointer,
440 sizeof(struct acpi_ptc_register));
441
442
443
444
445
446 obj = ptc->package.elements[1];
447
448 if ((obj.type != ACPI_TYPE_BUFFER)
449 || (obj.buffer.length < sizeof(struct acpi_ptc_register))
450 || (obj.buffer.pointer == NULL)) {
451 pr_err("Invalid _PTC data (status_register)\n");
452 result = -EFAULT;
453 goto end;
454 }
455
456 memcpy(&pr->throttling.status_register, obj.buffer.pointer,
457 sizeof(struct acpi_ptc_register));
458
459 throttling = &pr->throttling;
460
461 if ((throttling->control_register.bit_width +
462 throttling->control_register.bit_offset) > 32) {
463 pr_err("Invalid _PTC control register\n");
464 result = -EFAULT;
465 goto end;
466 }
467
468 if ((throttling->status_register.bit_width +
469 throttling->status_register.bit_offset) > 32) {
470 pr_err("Invalid _PTC status register\n");
471 result = -EFAULT;
472 goto end;
473 }
474
475end:
476 kfree(buffer.pointer);
477
478 return result;
479}
480
481
482
483
484static int acpi_processor_get_throttling_states(struct acpi_processor *pr)
485{
486 int result = 0;
487 acpi_status status = AE_OK;
488 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
489 struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" };
490 struct acpi_buffer state = { 0, NULL };
491 union acpi_object *tss = NULL;
492 int i;
493
494 status = acpi_evaluate_object(pr->handle, "_TSS", NULL, &buffer);
495 if (ACPI_FAILURE(status)) {
496 if (status != AE_NOT_FOUND)
497 acpi_evaluation_failure_warn(pr->handle, "_TSS", status);
498
499 return -ENODEV;
500 }
501
502 tss = buffer.pointer;
503 if (!tss || (tss->type != ACPI_TYPE_PACKAGE)) {
504 pr_err("Invalid _TSS data\n");
505 result = -EFAULT;
506 goto end;
507 }
508
509 acpi_handle_debug(pr->handle, "Found %d throttling states\n",
510 tss->package.count);
511
512 pr->throttling.state_count = tss->package.count;
513 pr->throttling.states_tss =
514 kmalloc_array(tss->package.count,
515 sizeof(struct acpi_processor_tx_tss),
516 GFP_KERNEL);
517 if (!pr->throttling.states_tss) {
518 result = -ENOMEM;
519 goto end;
520 }
521
522 for (i = 0; i < pr->throttling.state_count; i++) {
523
524 struct acpi_processor_tx_tss *tx =
525 (struct acpi_processor_tx_tss *)&(pr->throttling.
526 states_tss[i]);
527
528 state.length = sizeof(struct acpi_processor_tx_tss);
529 state.pointer = tx;
530
531 acpi_handle_debug(pr->handle, "Extracting state %d\n", i);
532
533 status = acpi_extract_package(&(tss->package.elements[i]),
534 &format, &state);
535 if (ACPI_FAILURE(status)) {
536 acpi_handle_warn(pr->handle, "Invalid _TSS data: %s\n",
537 acpi_format_exception(status));
538 result = -EFAULT;
539 kfree(pr->throttling.states_tss);
540 goto end;
541 }
542
543 if (!tx->freqpercentage) {
544 pr_err("Invalid _TSS data: freq is zero\n");
545 result = -EFAULT;
546 kfree(pr->throttling.states_tss);
547 goto end;
548 }
549 }
550
551end:
552 kfree(buffer.pointer);
553
554 return result;
555}
556
557
558
559
560static int acpi_processor_get_tsd(struct acpi_processor *pr)
561{
562 int result = 0;
563 acpi_status status = AE_OK;
564 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
565 struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" };
566 struct acpi_buffer state = { 0, NULL };
567 union acpi_object *tsd = NULL;
568 struct acpi_tsd_package *pdomain;
569 struct acpi_processor_throttling *pthrottling;
570
571 pthrottling = &pr->throttling;
572 pthrottling->tsd_valid_flag = 0;
573
574 status = acpi_evaluate_object(pr->handle, "_TSD", NULL, &buffer);
575 if (ACPI_FAILURE(status)) {
576 if (status != AE_NOT_FOUND)
577 acpi_evaluation_failure_warn(pr->handle, "_TSD", status);
578
579 return -ENODEV;
580 }
581
582 tsd = buffer.pointer;
583 if (!tsd || (tsd->type != ACPI_TYPE_PACKAGE)) {
584 pr_err("Invalid _TSD data\n");
585 result = -EFAULT;
586 goto end;
587 }
588
589 if (tsd->package.count != 1) {
590 pr_err("Invalid _TSD data\n");
591 result = -EFAULT;
592 goto end;
593 }
594
595 pdomain = &(pr->throttling.domain_info);
596
597 state.length = sizeof(struct acpi_tsd_package);
598 state.pointer = pdomain;
599
600 status = acpi_extract_package(&(tsd->package.elements[0]),
601 &format, &state);
602 if (ACPI_FAILURE(status)) {
603 pr_err("Invalid _TSD data\n");
604 result = -EFAULT;
605 goto end;
606 }
607
608 if (pdomain->num_entries != ACPI_TSD_REV0_ENTRIES) {
609 pr_err("Unknown _TSD:num_entries\n");
610 result = -EFAULT;
611 goto end;
612 }
613
614 if (pdomain->revision != ACPI_TSD_REV0_REVISION) {
615 pr_err("Unknown _TSD:revision\n");
616 result = -EFAULT;
617 goto end;
618 }
619
620 pthrottling = &pr->throttling;
621 pthrottling->tsd_valid_flag = 1;
622 pthrottling->shared_type = pdomain->coord_type;
623 cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map);
624
625
626
627
628
629 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
630 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
631 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
632 pthrottling->tsd_valid_flag = 0;
633 pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL;
634 }
635
636end:
637 kfree(buffer.pointer);
638 return result;
639}
640
641
642
643
644static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr)
645{
646 int state = 0;
647 u32 value = 0;
648 u32 duty_mask = 0;
649 u32 duty_value = 0;
650
651 if (!pr)
652 return -EINVAL;
653
654 if (!pr->flags.throttling)
655 return -ENODEV;
656
657
658
659
660
661
662
663
664 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
665
666 pr->throttling.state = 0;
667
668 duty_mask = pr->throttling.state_count - 1;
669
670 duty_mask <<= pr->throttling.duty_offset;
671
672 local_irq_disable();
673
674 value = inl(pr->throttling.address);
675
676
677
678
679
680 if (value & 0x10) {
681 duty_value = value & duty_mask;
682 duty_value >>= pr->throttling.duty_offset;
683
684 if (duty_value)
685 state = pr->throttling.state_count - duty_value;
686 }
687
688 pr->throttling.state = state;
689
690 local_irq_enable();
691
692 acpi_handle_debug(pr->handle,
693 "Throttling state is T%d (%d%% throttling applied)\n",
694 state, pr->throttling.states[state].performance);
695
696 return 0;
697}
698
699#ifdef CONFIG_X86
700static int acpi_throttling_rdmsr(u64 *value)
701{
702 u64 msr_high, msr_low;
703 u64 msr = 0;
704 int ret = -1;
705
706 if ((this_cpu_read(cpu_info.x86_vendor) != X86_VENDOR_INTEL) ||
707 !this_cpu_has(X86_FEATURE_ACPI)) {
708 pr_err("HARDWARE addr space,NOT supported yet\n");
709 } else {
710 msr_low = 0;
711 msr_high = 0;
712 rdmsr_safe(MSR_IA32_THERM_CONTROL,
713 (u32 *)&msr_low, (u32 *) &msr_high);
714 msr = (msr_high << 32) | msr_low;
715 *value = (u64) msr;
716 ret = 0;
717 }
718 return ret;
719}
720
721static int acpi_throttling_wrmsr(u64 value)
722{
723 int ret = -1;
724 u64 msr;
725
726 if ((this_cpu_read(cpu_info.x86_vendor) != X86_VENDOR_INTEL) ||
727 !this_cpu_has(X86_FEATURE_ACPI)) {
728 pr_err("HARDWARE addr space,NOT supported yet\n");
729 } else {
730 msr = value;
731 wrmsr_safe(MSR_IA32_THERM_CONTROL,
732 msr & 0xffffffff, msr >> 32);
733 ret = 0;
734 }
735 return ret;
736}
737#else
738static int acpi_throttling_rdmsr(u64 *value)
739{
740 pr_err("HARDWARE addr space,NOT supported yet\n");
741 return -1;
742}
743
744static int acpi_throttling_wrmsr(u64 value)
745{
746 pr_err("HARDWARE addr space,NOT supported yet\n");
747 return -1;
748}
749#endif
750
751static int acpi_read_throttling_status(struct acpi_processor *pr,
752 u64 *value)
753{
754 u32 bit_width, bit_offset;
755 u32 ptc_value;
756 u64 ptc_mask;
757 struct acpi_processor_throttling *throttling;
758 int ret = -1;
759
760 throttling = &pr->throttling;
761 switch (throttling->status_register.space_id) {
762 case ACPI_ADR_SPACE_SYSTEM_IO:
763 bit_width = throttling->status_register.bit_width;
764 bit_offset = throttling->status_register.bit_offset;
765
766 acpi_os_read_port((acpi_io_address) throttling->status_register.
767 address, &ptc_value,
768 (u32) (bit_width + bit_offset));
769 ptc_mask = (1 << bit_width) - 1;
770 *value = (u64) ((ptc_value >> bit_offset) & ptc_mask);
771 ret = 0;
772 break;
773 case ACPI_ADR_SPACE_FIXED_HARDWARE:
774 ret = acpi_throttling_rdmsr(value);
775 break;
776 default:
777 pr_err("Unknown addr space %d\n",
778 (u32) (throttling->status_register.space_id));
779 }
780 return ret;
781}
782
783static int acpi_write_throttling_state(struct acpi_processor *pr,
784 u64 value)
785{
786 u32 bit_width, bit_offset;
787 u64 ptc_value;
788 u64 ptc_mask;
789 struct acpi_processor_throttling *throttling;
790 int ret = -1;
791
792 throttling = &pr->throttling;
793 switch (throttling->control_register.space_id) {
794 case ACPI_ADR_SPACE_SYSTEM_IO:
795 bit_width = throttling->control_register.bit_width;
796 bit_offset = throttling->control_register.bit_offset;
797 ptc_mask = (1 << bit_width) - 1;
798 ptc_value = value & ptc_mask;
799
800 acpi_os_write_port((acpi_io_address) throttling->
801 control_register.address,
802 (u32) (ptc_value << bit_offset),
803 (u32) (bit_width + bit_offset));
804 ret = 0;
805 break;
806 case ACPI_ADR_SPACE_FIXED_HARDWARE:
807 ret = acpi_throttling_wrmsr(value);
808 break;
809 default:
810 pr_err("Unknown addr space %d\n",
811 (u32) (throttling->control_register.space_id));
812 }
813 return ret;
814}
815
816static int acpi_get_throttling_state(struct acpi_processor *pr,
817 u64 value)
818{
819 int i;
820
821 for (i = 0; i < pr->throttling.state_count; i++) {
822 struct acpi_processor_tx_tss *tx =
823 (struct acpi_processor_tx_tss *)&(pr->throttling.
824 states_tss[i]);
825 if (tx->control == value)
826 return i;
827 }
828 return -1;
829}
830
831static int acpi_get_throttling_value(struct acpi_processor *pr,
832 int state, u64 *value)
833{
834 int ret = -1;
835
836 if (state >= 0 && state <= pr->throttling.state_count) {
837 struct acpi_processor_tx_tss *tx =
838 (struct acpi_processor_tx_tss *)&(pr->throttling.
839 states_tss[state]);
840 *value = tx->control;
841 ret = 0;
842 }
843 return ret;
844}
845
846static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr)
847{
848 int state = 0;
849 int ret;
850 u64 value;
851
852 if (!pr)
853 return -EINVAL;
854
855 if (!pr->flags.throttling)
856 return -ENODEV;
857
858 pr->throttling.state = 0;
859
860 value = 0;
861 ret = acpi_read_throttling_status(pr, &value);
862 if (ret >= 0) {
863 state = acpi_get_throttling_state(pr, value);
864 if (state == -1) {
865 acpi_handle_debug(pr->handle,
866 "Invalid throttling state, reset\n");
867 state = 0;
868 ret = __acpi_processor_set_throttling(pr, state, true,
869 true);
870 if (ret)
871 return ret;
872 }
873 pr->throttling.state = state;
874 }
875
876 return 0;
877}
878
879static long __acpi_processor_get_throttling(void *data)
880{
881 struct acpi_processor *pr = data;
882
883 return pr->throttling.acpi_processor_get_throttling(pr);
884}
885
886static int acpi_processor_get_throttling(struct acpi_processor *pr)
887{
888 if (!pr)
889 return -EINVAL;
890
891 if (!pr->flags.throttling)
892 return -ENODEV;
893
894
895
896
897
898
899
900 if (!cpu_online(pr->id))
901 return -ENODEV;
902
903 return call_on_cpu(pr->id, __acpi_processor_get_throttling, pr, false);
904}
905
906static int acpi_processor_get_fadt_info(struct acpi_processor *pr)
907{
908 int i, step;
909
910 if (!pr->throttling.address) {
911 acpi_handle_debug(pr->handle, "No throttling register\n");
912 return -EINVAL;
913 } else if (!pr->throttling.duty_width) {
914 acpi_handle_debug(pr->handle, "No throttling states\n");
915 return -EINVAL;
916 }
917
918 else if ((pr->throttling.duty_offset + pr->throttling.duty_width) > 4) {
919 pr_warn("duty_cycle spans bit 4\n");
920 return -EINVAL;
921 }
922
923 pr->throttling.state_count = 1 << acpi_gbl_FADT.duty_width;
924
925
926
927
928
929
930
931 step = (1000 / pr->throttling.state_count);
932
933 for (i = 0; i < pr->throttling.state_count; i++) {
934 pr->throttling.states[i].performance = 1000 - step * i;
935 pr->throttling.states[i].power = 1000 - step * i;
936 }
937 return 0;
938}
939
940static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr,
941 int state, bool force)
942{
943 u32 value = 0;
944 u32 duty_mask = 0;
945 u32 duty_value = 0;
946
947 if (!pr)
948 return -EINVAL;
949
950 if ((state < 0) || (state > (pr->throttling.state_count - 1)))
951 return -EINVAL;
952
953 if (!pr->flags.throttling)
954 return -ENODEV;
955
956 if (!force && (state == pr->throttling.state))
957 return 0;
958
959 if (state < pr->throttling_platform_limit)
960 return -EPERM;
961
962
963
964 if (state) {
965 duty_value = pr->throttling.state_count - state;
966
967 duty_value <<= pr->throttling.duty_offset;
968
969
970 duty_mask = pr->throttling.state_count - 1;
971
972 duty_mask <<= acpi_gbl_FADT.duty_offset;
973 duty_mask = ~duty_mask;
974 }
975
976 local_irq_disable();
977
978
979
980
981
982 value = inl(pr->throttling.address);
983 if (value & 0x10) {
984 value &= 0xFFFFFFEF;
985 outl(value, pr->throttling.address);
986 }
987
988
989
990
991
992 if (state) {
993 value &= duty_mask;
994 value |= duty_value;
995 outl(value, pr->throttling.address);
996
997 value |= 0x00000010;
998 outl(value, pr->throttling.address);
999 }
1000
1001 pr->throttling.state = state;
1002
1003 local_irq_enable();
1004
1005 acpi_handle_debug(pr->handle,
1006 "Throttling state set to T%d (%d%%)\n", state,
1007 (pr->throttling.states[state].performance ? pr->
1008 throttling.states[state].performance / 10 : 0));
1009
1010 return 0;
1011}
1012
1013static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr,
1014 int state, bool force)
1015{
1016 int ret;
1017 u64 value;
1018
1019 if (!pr)
1020 return -EINVAL;
1021
1022 if ((state < 0) || (state > (pr->throttling.state_count - 1)))
1023 return -EINVAL;
1024
1025 if (!pr->flags.throttling)
1026 return -ENODEV;
1027
1028 if (!force && (state == pr->throttling.state))
1029 return 0;
1030
1031 if (state < pr->throttling_platform_limit)
1032 return -EPERM;
1033
1034 value = 0;
1035 ret = acpi_get_throttling_value(pr, state, &value);
1036 if (ret >= 0) {
1037 acpi_write_throttling_state(pr, value);
1038 pr->throttling.state = state;
1039 }
1040
1041 return 0;
1042}
1043
1044static long acpi_processor_throttling_fn(void *data)
1045{
1046 struct acpi_processor_throttling_arg *arg = data;
1047 struct acpi_processor *pr = arg->pr;
1048
1049 return pr->throttling.acpi_processor_set_throttling(pr,
1050 arg->target_state, arg->force);
1051}
1052
1053static int __acpi_processor_set_throttling(struct acpi_processor *pr,
1054 int state, bool force, bool direct)
1055{
1056 int ret = 0;
1057 unsigned int i;
1058 struct acpi_processor *match_pr;
1059 struct acpi_processor_throttling *p_throttling;
1060 struct acpi_processor_throttling_arg arg;
1061 struct throttling_tstate t_state;
1062
1063 if (!pr)
1064 return -EINVAL;
1065
1066 if (!pr->flags.throttling)
1067 return -ENODEV;
1068
1069 if ((state < 0) || (state > (pr->throttling.state_count - 1)))
1070 return -EINVAL;
1071
1072 if (cpu_is_offline(pr->id)) {
1073
1074
1075
1076
1077 return -ENODEV;
1078 }
1079
1080 t_state.target_state = state;
1081 p_throttling = &(pr->throttling);
1082
1083
1084
1085
1086
1087
1088 for_each_cpu_and(i, cpu_online_mask, p_throttling->shared_cpu_map) {
1089 t_state.cpu = i;
1090 acpi_processor_throttling_notifier(THROTTLING_PRECHANGE,
1091 &t_state);
1092 }
1093
1094
1095
1096
1097
1098
1099 if (p_throttling->shared_type == DOMAIN_COORD_TYPE_SW_ANY) {
1100 arg.pr = pr;
1101 arg.target_state = state;
1102 arg.force = force;
1103 ret = call_on_cpu(pr->id, acpi_processor_throttling_fn, &arg,
1104 direct);
1105 } else {
1106
1107
1108
1109
1110
1111 for_each_cpu_and(i, cpu_online_mask,
1112 p_throttling->shared_cpu_map) {
1113 match_pr = per_cpu(processors, i);
1114
1115
1116
1117
1118 if (!match_pr) {
1119 acpi_handle_debug(pr->handle,
1120 "Invalid Pointer for CPU %d\n", i);
1121 continue;
1122 }
1123
1124
1125
1126
1127 if (!match_pr->flags.throttling) {
1128 acpi_handle_debug(pr->handle,
1129 "Throttling Control unsupported on CPU %d\n", i);
1130 continue;
1131 }
1132
1133 arg.pr = match_pr;
1134 arg.target_state = state;
1135 arg.force = force;
1136 ret = call_on_cpu(pr->id, acpi_processor_throttling_fn,
1137 &arg, direct);
1138 }
1139 }
1140
1141
1142
1143
1144
1145
1146 for_each_cpu_and(i, cpu_online_mask, p_throttling->shared_cpu_map) {
1147 t_state.cpu = i;
1148 acpi_processor_throttling_notifier(THROTTLING_POSTCHANGE,
1149 &t_state);
1150 }
1151
1152 return ret;
1153}
1154
1155int acpi_processor_set_throttling(struct acpi_processor *pr, int state,
1156 bool force)
1157{
1158 return __acpi_processor_set_throttling(pr, state, force, false);
1159}
1160
1161int acpi_processor_get_throttling_info(struct acpi_processor *pr)
1162{
1163 int result = 0;
1164 struct acpi_processor_throttling *pthrottling;
1165
1166 acpi_handle_debug(pr->handle,
1167 "pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n",
1168 pr->throttling.address,
1169 pr->throttling.duty_offset,
1170 pr->throttling.duty_width);
1171
1172
1173
1174
1175
1176 if (acpi_processor_get_throttling_control(pr) ||
1177 acpi_processor_get_throttling_states(pr) ||
1178 acpi_processor_get_platform_limit(pr)) {
1179 pr->throttling.acpi_processor_get_throttling =
1180 &acpi_processor_get_throttling_fadt;
1181 pr->throttling.acpi_processor_set_throttling =
1182 &acpi_processor_set_throttling_fadt;
1183 if (acpi_processor_get_fadt_info(pr))
1184 return 0;
1185 } else {
1186 pr->throttling.acpi_processor_get_throttling =
1187 &acpi_processor_get_throttling_ptc;
1188 pr->throttling.acpi_processor_set_throttling =
1189 &acpi_processor_set_throttling_ptc;
1190 }
1191
1192
1193
1194
1195
1196 if (acpi_processor_get_tsd(pr)) {
1197 pthrottling = &pr->throttling;
1198 pthrottling->tsd_valid_flag = 0;
1199 cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map);
1200 pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL;
1201 }
1202
1203
1204
1205
1206
1207
1208 if (errata.piix4.throttle) {
1209 acpi_handle_debug(pr->handle,
1210 "Throttling not supported on PIIX4 A- or B-step\n");
1211 return 0;
1212 }
1213
1214 acpi_handle_debug(pr->handle, "Found %d throttling states\n",
1215 pr->throttling.state_count);
1216
1217 pr->flags.throttling = 1;
1218
1219
1220
1221
1222
1223
1224
1225 result = acpi_processor_get_throttling(pr);
1226 if (result)
1227 goto end;
1228
1229 if (pr->throttling.state) {
1230 acpi_handle_debug(pr->handle,
1231 "Disabling throttling (was T%d)\n",
1232 pr->throttling.state);
1233 result = acpi_processor_set_throttling(pr, 0, false);
1234 if (result)
1235 goto end;
1236 }
1237
1238end:
1239 if (result)
1240 pr->flags.throttling = 0;
1241
1242 return result;
1243}
1244
1245