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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/init.h>
17#include <linux/cpufreq.h>
18#include <linux/slab.h>
19#include <linux/acpi.h>
20#include <acpi/processor.h>
21#ifdef CONFIG_X86
22#include <asm/cpufeature.h>
23#endif
24
25#define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
26
27static DEFINE_MUTEX(performance_mutex);
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45static int ignore_ppc = -1;
46module_param(ignore_ppc, int, 0644);
47MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
48 "limited by BIOS, this should help");
49
50static bool acpi_processor_ppc_in_use;
51
52static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
53{
54 acpi_status status = 0;
55 unsigned long long ppc = 0;
56 int ret;
57
58 if (!pr)
59 return -EINVAL;
60
61
62
63
64
65 status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
66 if (status != AE_NOT_FOUND) {
67 acpi_processor_ppc_in_use = true;
68
69 if (ACPI_FAILURE(status)) {
70 acpi_evaluation_failure_warn(pr->handle, "_PPC", status);
71 return -ENODEV;
72 }
73 }
74
75 pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
76 (int)ppc, ppc ? "" : "not");
77
78 pr->performance_platform_limit = (int)ppc;
79
80 if (ppc >= pr->performance->state_count ||
81 unlikely(!freq_qos_request_active(&pr->perflib_req)))
82 return 0;
83
84 ret = freq_qos_update_request(&pr->perflib_req,
85 pr->performance->states[ppc].core_frequency * 1000);
86 if (ret < 0) {
87 pr_warn("Failed to update perflib freq constraint: CPU%d (%d)\n",
88 pr->id, ret);
89 }
90
91 return 0;
92}
93
94#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
95
96
97
98
99
100
101
102static void acpi_processor_ppc_ost(acpi_handle handle, int status)
103{
104 if (acpi_has_method(handle, "_OST"))
105 acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
106 status, NULL);
107}
108
109void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
110{
111 int ret;
112
113 if (ignore_ppc || !pr->performance) {
114
115
116
117
118 if (event_flag)
119 acpi_processor_ppc_ost(pr->handle, 1);
120 return;
121 }
122
123 ret = acpi_processor_get_platform_limit(pr);
124
125
126
127
128 if (event_flag) {
129 if (ret < 0)
130 acpi_processor_ppc_ost(pr->handle, 1);
131 else
132 acpi_processor_ppc_ost(pr->handle, 0);
133 }
134 if (ret >= 0)
135 cpufreq_update_limits(pr->id);
136}
137
138int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
139{
140 struct acpi_processor *pr;
141
142 pr = per_cpu(processors, cpu);
143 if (!pr || !pr->performance || !pr->performance->state_count)
144 return -ENODEV;
145 *limit = pr->performance->states[pr->performance_platform_limit].
146 core_frequency * 1000;
147 return 0;
148}
149EXPORT_SYMBOL(acpi_processor_get_bios_limit);
150
151void acpi_processor_ignore_ppc_init(void)
152{
153 if (ignore_ppc < 0)
154 ignore_ppc = 0;
155}
156
157void acpi_processor_ppc_init(struct cpufreq_policy *policy)
158{
159 unsigned int cpu;
160
161 for_each_cpu(cpu, policy->related_cpus) {
162 struct acpi_processor *pr = per_cpu(processors, cpu);
163 int ret;
164
165 if (!pr)
166 continue;
167
168 ret = freq_qos_add_request(&policy->constraints,
169 &pr->perflib_req,
170 FREQ_QOS_MAX, INT_MAX);
171 if (ret < 0)
172 pr_err("Failed to add freq constraint for CPU%d (%d)\n",
173 cpu, ret);
174 }
175}
176
177void acpi_processor_ppc_exit(struct cpufreq_policy *policy)
178{
179 unsigned int cpu;
180
181 for_each_cpu(cpu, policy->related_cpus) {
182 struct acpi_processor *pr = per_cpu(processors, cpu);
183
184 if (pr)
185 freq_qos_remove_request(&pr->perflib_req);
186 }
187}
188
189static int acpi_processor_get_performance_control(struct acpi_processor *pr)
190{
191 int result = 0;
192 acpi_status status = 0;
193 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
194 union acpi_object *pct = NULL;
195 union acpi_object obj = { 0 };
196
197 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
198 if (ACPI_FAILURE(status)) {
199 acpi_evaluation_failure_warn(pr->handle, "_PCT", status);
200 return -ENODEV;
201 }
202
203 pct = (union acpi_object *)buffer.pointer;
204 if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
205 || (pct->package.count != 2)) {
206 pr_err("Invalid _PCT data\n");
207 result = -EFAULT;
208 goto end;
209 }
210
211
212
213
214
215 obj = pct->package.elements[0];
216
217 if ((obj.type != ACPI_TYPE_BUFFER)
218 || (obj.buffer.length < sizeof(struct acpi_pct_register))
219 || (obj.buffer.pointer == NULL)) {
220 pr_err("Invalid _PCT data (control_register)\n");
221 result = -EFAULT;
222 goto end;
223 }
224 memcpy(&pr->performance->control_register, obj.buffer.pointer,
225 sizeof(struct acpi_pct_register));
226
227
228
229
230
231 obj = pct->package.elements[1];
232
233 if ((obj.type != ACPI_TYPE_BUFFER)
234 || (obj.buffer.length < sizeof(struct acpi_pct_register))
235 || (obj.buffer.pointer == NULL)) {
236 pr_err("Invalid _PCT data (status_register)\n");
237 result = -EFAULT;
238 goto end;
239 }
240
241 memcpy(&pr->performance->status_register, obj.buffer.pointer,
242 sizeof(struct acpi_pct_register));
243
244end:
245 kfree(buffer.pointer);
246
247 return result;
248}
249
250#ifdef CONFIG_X86
251
252
253
254
255static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
256{
257 u32 hi, lo, fid, did;
258 int index = px->control & 0x00000007;
259
260 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
261 return;
262
263 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
264 || boot_cpu_data.x86 == 0x11) {
265 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
266
267
268
269
270 if (!(hi & BIT(31)))
271 return;
272
273 fid = lo & 0x3f;
274 did = (lo >> 6) & 7;
275 if (boot_cpu_data.x86 == 0x10)
276 px->core_frequency = (100 * (fid + 0x10)) >> did;
277 else
278 px->core_frequency = (100 * (fid + 8)) >> did;
279 }
280}
281#else
282static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
283#endif
284
285static int acpi_processor_get_performance_states(struct acpi_processor *pr)
286{
287 int result = 0;
288 acpi_status status = AE_OK;
289 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
290 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
291 struct acpi_buffer state = { 0, NULL };
292 union acpi_object *pss = NULL;
293 int i;
294 int last_invalid = -1;
295
296 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
297 if (ACPI_FAILURE(status)) {
298 acpi_evaluation_failure_warn(pr->handle, "_PSS", status);
299 return -ENODEV;
300 }
301
302 pss = buffer.pointer;
303 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
304 pr_err("Invalid _PSS data\n");
305 result = -EFAULT;
306 goto end;
307 }
308
309 acpi_handle_debug(pr->handle, "Found %d performance states\n",
310 pss->package.count);
311
312 pr->performance->state_count = pss->package.count;
313 pr->performance->states =
314 kmalloc_array(pss->package.count,
315 sizeof(struct acpi_processor_px),
316 GFP_KERNEL);
317 if (!pr->performance->states) {
318 result = -ENOMEM;
319 goto end;
320 }
321
322 for (i = 0; i < pr->performance->state_count; i++) {
323
324 struct acpi_processor_px *px = &(pr->performance->states[i]);
325
326 state.length = sizeof(struct acpi_processor_px);
327 state.pointer = px;
328
329 acpi_handle_debug(pr->handle, "Extracting state %d\n", i);
330
331 status = acpi_extract_package(&(pss->package.elements[i]),
332 &format, &state);
333 if (ACPI_FAILURE(status)) {
334 acpi_handle_warn(pr->handle, "Invalid _PSS data: %s\n",
335 acpi_format_exception(status));
336 result = -EFAULT;
337 kfree(pr->performance->states);
338 goto end;
339 }
340
341 amd_fixup_frequency(px, i);
342
343 acpi_handle_debug(pr->handle,
344 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
345 i,
346 (u32) px->core_frequency,
347 (u32) px->power,
348 (u32) px->transition_latency,
349 (u32) px->bus_master_latency,
350 (u32) px->control, (u32) px->status);
351
352
353
354
355 if (!px->core_frequency ||
356 ((u32)(px->core_frequency * 1000) !=
357 (px->core_frequency * 1000))) {
358 pr_err(FW_BUG
359 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
360 pr->id, px->core_frequency);
361 if (last_invalid == -1)
362 last_invalid = i;
363 } else {
364 if (last_invalid != -1) {
365
366
367
368 memcpy(&(pr->performance->states[last_invalid]),
369 px, sizeof(struct acpi_processor_px));
370 ++last_invalid;
371 }
372 }
373 }
374
375 if (last_invalid == 0) {
376 pr_err(FW_BUG
377 "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
378 result = -EFAULT;
379 kfree(pr->performance->states);
380 pr->performance->states = NULL;
381 }
382
383 if (last_invalid > 0)
384 pr->performance->state_count = last_invalid;
385
386end:
387 kfree(buffer.pointer);
388
389 return result;
390}
391
392int acpi_processor_get_performance_info(struct acpi_processor *pr)
393{
394 int result = 0;
395
396 if (!pr || !pr->performance || !pr->handle)
397 return -EINVAL;
398
399 if (!acpi_has_method(pr->handle, "_PCT")) {
400 acpi_handle_debug(pr->handle,
401 "ACPI-based processor performance control unavailable\n");
402 return -ENODEV;
403 }
404
405 result = acpi_processor_get_performance_control(pr);
406 if (result)
407 goto update_bios;
408
409 result = acpi_processor_get_performance_states(pr);
410 if (result)
411 goto update_bios;
412
413
414 if (ignore_ppc != 1)
415 result = acpi_processor_get_platform_limit(pr);
416
417 return result;
418
419
420
421
422
423 update_bios:
424#ifdef CONFIG_X86
425 if (acpi_has_method(pr->handle, "_PPC")) {
426 if(boot_cpu_has(X86_FEATURE_EST))
427 pr_warn(FW_BUG "BIOS needs update for CPU "
428 "frequency support\n");
429 }
430#endif
431 return result;
432}
433EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
434
435int acpi_processor_pstate_control(void)
436{
437 acpi_status status;
438
439 if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
440 return 0;
441
442 pr_debug("Writing pstate_control [0x%x] to smi_command [0x%x]\n",
443 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command);
444
445 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
446 (u32)acpi_gbl_FADT.pstate_control, 8);
447 if (ACPI_SUCCESS(status))
448 return 1;
449
450 pr_warn("Failed to write pstate_control [0x%x] to smi_command [0x%x]: %s\n",
451 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command,
452 acpi_format_exception(status));
453 return -EIO;
454}
455
456int acpi_processor_notify_smm(struct module *calling_module)
457{
458 static int is_done;
459 int result;
460
461 if (!acpi_processor_cpufreq_init)
462 return -EBUSY;
463
464 if (!try_module_get(calling_module))
465 return -EINVAL;
466
467
468
469
470
471
472 if (is_done > 0) {
473 module_put(calling_module);
474 return 0;
475 } else if (is_done < 0) {
476 module_put(calling_module);
477 return is_done;
478 }
479
480 is_done = -EIO;
481
482 result = acpi_processor_pstate_control();
483 if (!result) {
484 pr_debug("No SMI port or pstate_control\n");
485 module_put(calling_module);
486 return 0;
487 }
488 if (result < 0) {
489 module_put(calling_module);
490 return result;
491 }
492
493
494
495 is_done = 1;
496
497 if (!acpi_processor_ppc_in_use)
498 module_put(calling_module);
499
500 return 0;
501}
502
503EXPORT_SYMBOL(acpi_processor_notify_smm);
504
505int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)
506{
507 int result = 0;
508 acpi_status status = AE_OK;
509 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
510 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
511 struct acpi_buffer state = {0, NULL};
512 union acpi_object *psd = NULL;
513
514 status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer);
515 if (ACPI_FAILURE(status)) {
516 return -ENODEV;
517 }
518
519 psd = buffer.pointer;
520 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
521 pr_err("Invalid _PSD data\n");
522 result = -EFAULT;
523 goto end;
524 }
525
526 if (psd->package.count != 1) {
527 pr_err("Invalid _PSD data\n");
528 result = -EFAULT;
529 goto end;
530 }
531
532 state.length = sizeof(struct acpi_psd_package);
533 state.pointer = pdomain;
534
535 status = acpi_extract_package(&(psd->package.elements[0]),
536 &format, &state);
537 if (ACPI_FAILURE(status)) {
538 pr_err("Invalid _PSD data\n");
539 result = -EFAULT;
540 goto end;
541 }
542
543 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
544 pr_err("Unknown _PSD:num_entries\n");
545 result = -EFAULT;
546 goto end;
547 }
548
549 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
550 pr_err("Unknown _PSD:revision\n");
551 result = -EFAULT;
552 goto end;
553 }
554
555 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
556 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
557 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
558 pr_err("Invalid _PSD:coord_type\n");
559 result = -EFAULT;
560 goto end;
561 }
562end:
563 kfree(buffer.pointer);
564 return result;
565}
566EXPORT_SYMBOL(acpi_processor_get_psd);
567
568int acpi_processor_preregister_performance(
569 struct acpi_processor_performance __percpu *performance)
570{
571 int count_target;
572 int retval = 0;
573 unsigned int i, j;
574 cpumask_var_t covered_cpus;
575 struct acpi_processor *pr;
576 struct acpi_psd_package *pdomain;
577 struct acpi_processor *match_pr;
578 struct acpi_psd_package *match_pdomain;
579
580 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
581 return -ENOMEM;
582
583 mutex_lock(&performance_mutex);
584
585
586
587
588
589 for_each_possible_cpu(i) {
590 pr = per_cpu(processors, i);
591 if (!pr) {
592
593 continue;
594 }
595
596 if (pr->performance) {
597 retval = -EBUSY;
598 goto err_out;
599 }
600
601 if (!performance || !per_cpu_ptr(performance, i)) {
602 retval = -EINVAL;
603 goto err_out;
604 }
605 }
606
607
608 for_each_possible_cpu(i) {
609 pr = per_cpu(processors, i);
610 if (!pr)
611 continue;
612
613 pr->performance = per_cpu_ptr(performance, i);
614 pdomain = &(pr->performance->domain_info);
615 if (acpi_processor_get_psd(pr->handle, pdomain)) {
616 retval = -EINVAL;
617 continue;
618 }
619 }
620 if (retval)
621 goto err_ret;
622
623
624
625
626
627 for_each_possible_cpu(i) {
628 pr = per_cpu(processors, i);
629 if (!pr)
630 continue;
631
632 if (cpumask_test_cpu(i, covered_cpus))
633 continue;
634
635 pdomain = &(pr->performance->domain_info);
636 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
637 cpumask_set_cpu(i, covered_cpus);
638 if (pdomain->num_processors <= 1)
639 continue;
640
641
642 count_target = pdomain->num_processors;
643 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
644 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
645 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
646 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
647 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
648 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
649
650 for_each_possible_cpu(j) {
651 if (i == j)
652 continue;
653
654 match_pr = per_cpu(processors, j);
655 if (!match_pr)
656 continue;
657
658 match_pdomain = &(match_pr->performance->domain_info);
659 if (match_pdomain->domain != pdomain->domain)
660 continue;
661
662
663
664 if (match_pdomain->num_processors != count_target) {
665 retval = -EINVAL;
666 goto err_ret;
667 }
668
669 if (pdomain->coord_type != match_pdomain->coord_type) {
670 retval = -EINVAL;
671 goto err_ret;
672 }
673
674 cpumask_set_cpu(j, covered_cpus);
675 cpumask_set_cpu(j, pr->performance->shared_cpu_map);
676 }
677
678 for_each_possible_cpu(j) {
679 if (i == j)
680 continue;
681
682 match_pr = per_cpu(processors, j);
683 if (!match_pr)
684 continue;
685
686 match_pdomain = &(match_pr->performance->domain_info);
687 if (match_pdomain->domain != pdomain->domain)
688 continue;
689
690 match_pr->performance->shared_type =
691 pr->performance->shared_type;
692 cpumask_copy(match_pr->performance->shared_cpu_map,
693 pr->performance->shared_cpu_map);
694 }
695 }
696
697err_ret:
698 for_each_possible_cpu(i) {
699 pr = per_cpu(processors, i);
700 if (!pr || !pr->performance)
701 continue;
702
703
704 if (retval) {
705 cpumask_clear(pr->performance->shared_cpu_map);
706 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
707 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_NONE;
708 }
709 pr->performance = NULL;
710 }
711
712err_out:
713 mutex_unlock(&performance_mutex);
714 free_cpumask_var(covered_cpus);
715 return retval;
716}
717EXPORT_SYMBOL(acpi_processor_preregister_performance);
718
719int
720acpi_processor_register_performance(struct acpi_processor_performance
721 *performance, unsigned int cpu)
722{
723 struct acpi_processor *pr;
724
725 if (!acpi_processor_cpufreq_init)
726 return -EINVAL;
727
728 mutex_lock(&performance_mutex);
729
730 pr = per_cpu(processors, cpu);
731 if (!pr) {
732 mutex_unlock(&performance_mutex);
733 return -ENODEV;
734 }
735
736 if (pr->performance) {
737 mutex_unlock(&performance_mutex);
738 return -EBUSY;
739 }
740
741 WARN_ON(!performance);
742
743 pr->performance = performance;
744
745 if (acpi_processor_get_performance_info(pr)) {
746 pr->performance = NULL;
747 mutex_unlock(&performance_mutex);
748 return -EIO;
749 }
750
751 mutex_unlock(&performance_mutex);
752 return 0;
753}
754
755EXPORT_SYMBOL(acpi_processor_register_performance);
756
757void acpi_processor_unregister_performance(unsigned int cpu)
758{
759 struct acpi_processor *pr;
760
761 mutex_lock(&performance_mutex);
762
763 pr = per_cpu(processors, cpu);
764 if (!pr) {
765 mutex_unlock(&performance_mutex);
766 return;
767 }
768
769 if (pr->performance)
770 kfree(pr->performance->states);
771 pr->performance = NULL;
772
773 mutex_unlock(&performance_mutex);
774
775 return;
776}
777
778EXPORT_SYMBOL(acpi_processor_unregister_performance);
779