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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $)
4 *
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
8 * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
9 * - Added processor hotplug support
10 */
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
27/*
28 * _PPC support is implemented as a CPUfreq policy notifier:
29 * This means each time a CPUfreq driver registered also with
30 * the ACPI core is asked to change the speed policy, the maximum
31 * value is adjusted so that it is within the platform limit.
32 *
33 * Also, when a new platform limit value is detected, the CPUfreq
34 * policy is adjusted accordingly.
35 */
36
37/* ignore_ppc:
38 * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
39 * ignore _PPC
40 * 0 -> cpufreq low level drivers initialized -> consider _PPC values
41 * 1 -> ignore _PPC totally -> forced by user through boot param
42 */
43static int ignore_ppc = -1;
44module_param(ignore_ppc, int, 0644);
45MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
46 "limited by BIOS, this should help");
47
48static bool acpi_processor_ppc_in_use;
49
50static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
51{
52 acpi_status status = 0;
53 unsigned long long ppc = 0;
54 s32 qos_value;
55 int index;
56 int ret;
57
58 if (!pr)
59 return -EINVAL;
60
61 /*
62 * _PPC indicates the maximum state currently supported by the platform
63 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
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 index = ppc;
76
77 if (pr->performance_platform_limit == index ||
78 ppc >= pr->performance->state_count)
79 return 0;
80
81 pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
82 index, index ? "is" : "is not");
83
84 pr->performance_platform_limit = index;
85
86 if (unlikely(!freq_qos_request_active(&pr->perflib_req)))
87 return 0;
88
89 /*
90 * If _PPC returns 0, it means that all of the available states can be
91 * used ("no limit").
92 */
93 if (index == 0)
94 qos_value = FREQ_QOS_MAX_DEFAULT_VALUE;
95 else
96 qos_value = pr->performance->states[index].core_frequency * 1000;
97
98 ret = freq_qos_update_request(&pr->perflib_req, qos_value);
99 if (ret < 0) {
100 pr_warn("Failed to update perflib freq constraint: CPU%d (%d)\n",
101 pr->id, ret);
102 }
103
104 return 0;
105}
106
107#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
108/*
109 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
110 * @handle: ACPI processor handle
111 * @status: the status code of _PPC evaluation
112 * 0: success. OSPM is now using the performance state specified.
113 * 1: failure. OSPM has not changed the number of P-states in use
114 */
115static void acpi_processor_ppc_ost(acpi_handle handle, int status)
116{
117 if (acpi_has_method(handle, "_OST"))
118 acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
119 status, NULL);
120}
121
122void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
123{
124 int ret;
125
126 if (ignore_ppc || !pr->performance) {
127 /*
128 * Only when it is notification event, the _OST object
129 * will be evaluated. Otherwise it is skipped.
130 */
131 if (event_flag)
132 acpi_processor_ppc_ost(pr->handle, 1);
133 return;
134 }
135
136 ret = acpi_processor_get_platform_limit(pr);
137 /*
138 * Only when it is notification event, the _OST object
139 * will be evaluated. Otherwise it is skipped.
140 */
141 if (event_flag) {
142 if (ret < 0)
143 acpi_processor_ppc_ost(pr->handle, 1);
144 else
145 acpi_processor_ppc_ost(pr->handle, 0);
146 }
147 if (ret >= 0)
148 cpufreq_update_limits(pr->id);
149}
150
151int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
152{
153 struct acpi_processor *pr;
154
155 pr = per_cpu(processors, cpu);
156 if (!pr || !pr->performance || !pr->performance->state_count)
157 return -ENODEV;
158
159 *limit = pr->performance->states[pr->performance_platform_limit].
160 core_frequency * 1000;
161 return 0;
162}
163EXPORT_SYMBOL(acpi_processor_get_bios_limit);
164
165void acpi_processor_ignore_ppc_init(void)
166{
167 if (ignore_ppc < 0)
168 ignore_ppc = 0;
169}
170
171void acpi_processor_ppc_init(struct cpufreq_policy *policy)
172{
173 unsigned int cpu;
174
175 for_each_cpu(cpu, policy->related_cpus) {
176 struct acpi_processor *pr = per_cpu(processors, cpu);
177 int ret;
178
179 if (!pr)
180 continue;
181
182 /*
183 * Reset performance_platform_limit in case there is a stale
184 * value in it, so as to make it match the "no limit" QoS value
185 * below.
186 */
187 pr->performance_platform_limit = 0;
188
189 ret = freq_qos_add_request(&policy->constraints,
190 &pr->perflib_req, FREQ_QOS_MAX,
191 FREQ_QOS_MAX_DEFAULT_VALUE);
192 if (ret < 0)
193 pr_err("Failed to add freq constraint for CPU%d (%d)\n",
194 cpu, ret);
195 }
196}
197
198void acpi_processor_ppc_exit(struct cpufreq_policy *policy)
199{
200 unsigned int cpu;
201
202 for_each_cpu(cpu, policy->related_cpus) {
203 struct acpi_processor *pr = per_cpu(processors, cpu);
204
205 if (pr)
206 freq_qos_remove_request(&pr->perflib_req);
207 }
208}
209
210#ifdef CONFIG_X86
211
212static DEFINE_MUTEX(performance_mutex);
213
214static int acpi_processor_get_performance_control(struct acpi_processor *pr)
215{
216 int result = 0;
217 acpi_status status = 0;
218 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
219 union acpi_object *pct = NULL;
220 union acpi_object obj = { 0 };
221
222 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
223 if (ACPI_FAILURE(status)) {
224 acpi_evaluation_failure_warn(pr->handle, "_PCT", status);
225 return -ENODEV;
226 }
227
228 pct = (union acpi_object *)buffer.pointer;
229 if (!pct || pct->type != ACPI_TYPE_PACKAGE || pct->package.count != 2) {
230 pr_err("Invalid _PCT data\n");
231 result = -EFAULT;
232 goto end;
233 }
234
235 /*
236 * control_register
237 */
238
239 obj = pct->package.elements[0];
240
241 if (!obj.buffer.pointer || obj.type != ACPI_TYPE_BUFFER ||
242 obj.buffer.length < sizeof(struct acpi_pct_register)) {
243 pr_err("Invalid _PCT data (control_register)\n");
244 result = -EFAULT;
245 goto end;
246 }
247 memcpy(&pr->performance->control_register, obj.buffer.pointer,
248 sizeof(struct acpi_pct_register));
249
250 /*
251 * status_register
252 */
253
254 obj = pct->package.elements[1];
255
256 if (!obj.buffer.pointer || obj.type != ACPI_TYPE_BUFFER ||
257 obj.buffer.length < sizeof(struct acpi_pct_register)) {
258 pr_err("Invalid _PCT data (status_register)\n");
259 result = -EFAULT;
260 goto end;
261 }
262
263 memcpy(&pr->performance->status_register, obj.buffer.pointer,
264 sizeof(struct acpi_pct_register));
265
266end:
267 kfree(buffer.pointer);
268
269 return result;
270}
271
272/*
273 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
274 * in their ACPI data. Calculate the real values and fix up the _PSS data.
275 */
276static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
277{
278 u32 hi, lo, fid, did;
279 int index = px->control & 0x00000007;
280
281 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
282 return;
283
284 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) ||
285 boot_cpu_data.x86 == 0x11) {
286 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
287 /*
288 * MSR C001_0064+:
289 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
290 */
291 if (!(hi & BIT(31)))
292 return;
293
294 fid = lo & 0x3f;
295 did = (lo >> 6) & 7;
296 if (boot_cpu_data.x86 == 0x10)
297 px->core_frequency = (100 * (fid + 0x10)) >> did;
298 else
299 px->core_frequency = (100 * (fid + 8)) >> did;
300 }
301}
302
303static int acpi_processor_get_performance_states(struct acpi_processor *pr)
304{
305 int result = 0;
306 acpi_status status = AE_OK;
307 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
308 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
309 struct acpi_buffer state = { 0, NULL };
310 union acpi_object *pss = NULL;
311 int i;
312 int last_invalid = -1;
313
314 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
315 if (ACPI_FAILURE(status)) {
316 acpi_evaluation_failure_warn(pr->handle, "_PSS", status);
317 return -ENODEV;
318 }
319
320 pss = buffer.pointer;
321 if (!pss || pss->type != ACPI_TYPE_PACKAGE) {
322 pr_err("Invalid _PSS data\n");
323 result = -EFAULT;
324 goto end;
325 }
326
327 acpi_handle_debug(pr->handle, "Found %d performance states\n",
328 pss->package.count);
329
330 pr->performance->state_count = pss->package.count;
331 pr->performance->states =
332 kmalloc_array(pss->package.count,
333 sizeof(struct acpi_processor_px),
334 GFP_KERNEL);
335 if (!pr->performance->states) {
336 result = -ENOMEM;
337 goto end;
338 }
339
340 for (i = 0; i < pr->performance->state_count; i++) {
341
342 struct acpi_processor_px *px = &(pr->performance->states[i]);
343
344 state.length = sizeof(struct acpi_processor_px);
345 state.pointer = px;
346
347 acpi_handle_debug(pr->handle, "Extracting state %d\n", i);
348
349 status = acpi_extract_package(&(pss->package.elements[i]),
350 &format, &state);
351 if (ACPI_FAILURE(status)) {
352 acpi_handle_warn(pr->handle, "Invalid _PSS data: %s\n",
353 acpi_format_exception(status));
354 result = -EFAULT;
355 kfree(pr->performance->states);
356 goto end;
357 }
358
359 amd_fixup_frequency(px, i);
360
361 acpi_handle_debug(pr->handle,
362 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
363 i,
364 (u32) px->core_frequency,
365 (u32) px->power,
366 (u32) px->transition_latency,
367 (u32) px->bus_master_latency,
368 (u32) px->control, (u32) px->status);
369
370 /*
371 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
372 */
373 if (!px->core_frequency ||
374 (u32)(px->core_frequency * 1000) != px->core_frequency * 1000) {
375 pr_err(FW_BUG
376 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
377 pr->id, px->core_frequency);
378 if (last_invalid == -1)
379 last_invalid = i;
380 } else {
381 if (last_invalid != -1) {
382 /*
383 * Copy this valid entry over last_invalid entry
384 */
385 memcpy(&(pr->performance->states[last_invalid]),
386 px, sizeof(struct acpi_processor_px));
387 ++last_invalid;
388 }
389 }
390 }
391
392 if (last_invalid == 0) {
393 pr_err(FW_BUG
394 "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
395 result = -EFAULT;
396 kfree(pr->performance->states);
397 pr->performance->states = NULL;
398 }
399
400 if (last_invalid > 0)
401 pr->performance->state_count = last_invalid;
402
403end:
404 kfree(buffer.pointer);
405
406 return result;
407}
408
409int acpi_processor_get_performance_info(struct acpi_processor *pr)
410{
411 int result = 0;
412
413 if (!pr || !pr->performance || !pr->handle)
414 return -EINVAL;
415
416 if (!acpi_has_method(pr->handle, "_PCT")) {
417 acpi_handle_debug(pr->handle,
418 "ACPI-based processor performance control unavailable\n");
419 return -ENODEV;
420 }
421
422 result = acpi_processor_get_performance_control(pr);
423 if (result)
424 goto update_bios;
425
426 result = acpi_processor_get_performance_states(pr);
427 if (result)
428 goto update_bios;
429
430 /* We need to call _PPC once when cpufreq starts */
431 if (ignore_ppc != 1)
432 result = acpi_processor_get_platform_limit(pr);
433
434 return result;
435
436 /*
437 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
438 * the BIOS is older than the CPU and does not know its frequencies
439 */
440 update_bios:
441 if (acpi_has_method(pr->handle, "_PPC")) {
442 if(boot_cpu_has(X86_FEATURE_EST))
443 pr_warn(FW_BUG "BIOS needs update for CPU "
444 "frequency support\n");
445 }
446 return result;
447}
448EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
449
450int acpi_processor_pstate_control(void)
451{
452 acpi_status status;
453
454 if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
455 return 0;
456
457 pr_debug("Writing pstate_control [0x%x] to smi_command [0x%x]\n",
458 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command);
459
460 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
461 (u32)acpi_gbl_FADT.pstate_control, 8);
462 if (ACPI_SUCCESS(status))
463 return 1;
464
465 pr_warn("Failed to write pstate_control [0x%x] to smi_command [0x%x]: %s\n",
466 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command,
467 acpi_format_exception(status));
468 return -EIO;
469}
470
471int acpi_processor_notify_smm(struct module *calling_module)
472{
473 static int is_done;
474 int result = 0;
475
476 if (!acpi_processor_cpufreq_init)
477 return -EBUSY;
478
479 if (!try_module_get(calling_module))
480 return -EINVAL;
481
482 /*
483 * is_done is set to negative if an error occurs and to 1 if no error
484 * occurrs, but SMM has been notified already. This avoids repeated
485 * notification which might lead to unexpected results.
486 */
487 if (is_done != 0) {
488 if (is_done < 0)
489 result = is_done;
490
491 goto out_put;
492 }
493
494 result = acpi_processor_pstate_control();
495 if (result <= 0) {
496 if (result) {
497 is_done = result;
498 } else {
499 pr_debug("No SMI port or pstate_control\n");
500 is_done = 1;
501 }
502 goto out_put;
503 }
504
505 is_done = 1;
506 /*
507 * Success. If there _PPC, unloading the cpufreq driver would be risky,
508 * so disallow it in that case.
509 */
510 if (acpi_processor_ppc_in_use)
511 return 0;
512
513out_put:
514 module_put(calling_module);
515 return result;
516}
517EXPORT_SYMBOL(acpi_processor_notify_smm);
518
519int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)
520{
521 int result = 0;
522 acpi_status status = AE_OK;
523 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
524 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
525 struct acpi_buffer state = {0, NULL};
526 union acpi_object *psd = NULL;
527
528 status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer);
529 if (ACPI_FAILURE(status)) {
530 return -ENODEV;
531 }
532
533 psd = buffer.pointer;
534 if (!psd || psd->type != ACPI_TYPE_PACKAGE) {
535 pr_err("Invalid _PSD data\n");
536 result = -EFAULT;
537 goto end;
538 }
539
540 if (psd->package.count != 1) {
541 pr_err("Invalid _PSD data\n");
542 result = -EFAULT;
543 goto end;
544 }
545
546 state.length = sizeof(struct acpi_psd_package);
547 state.pointer = pdomain;
548
549 status = acpi_extract_package(&(psd->package.elements[0]), &format, &state);
550 if (ACPI_FAILURE(status)) {
551 pr_err("Invalid _PSD data\n");
552 result = -EFAULT;
553 goto end;
554 }
555
556 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
557 pr_err("Unknown _PSD:num_entries\n");
558 result = -EFAULT;
559 goto end;
560 }
561
562 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
563 pr_err("Unknown _PSD:revision\n");
564 result = -EFAULT;
565 goto end;
566 }
567
568 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
569 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
570 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
571 pr_err("Invalid _PSD:coord_type\n");
572 result = -EFAULT;
573 goto end;
574 }
575end:
576 kfree(buffer.pointer);
577 return result;
578}
579EXPORT_SYMBOL(acpi_processor_get_psd);
580
581int acpi_processor_preregister_performance(
582 struct acpi_processor_performance __percpu *performance)
583{
584 int count_target;
585 int retval = 0;
586 unsigned int i, j;
587 cpumask_var_t covered_cpus;
588 struct acpi_processor *pr;
589 struct acpi_psd_package *pdomain;
590 struct acpi_processor *match_pr;
591 struct acpi_psd_package *match_pdomain;
592
593 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
594 return -ENOMEM;
595
596 mutex_lock(&performance_mutex);
597
598 /*
599 * Check if another driver has already registered, and abort before
600 * changing pr->performance if it has. Check input data as well.
601 */
602 for_each_possible_cpu(i) {
603 pr = per_cpu(processors, i);
604 if (!pr) {
605 /* Look only at processors in ACPI namespace */
606 continue;
607 }
608
609 if (pr->performance) {
610 retval = -EBUSY;
611 goto err_out;
612 }
613
614 if (!performance || !per_cpu_ptr(performance, i)) {
615 retval = -EINVAL;
616 goto err_out;
617 }
618 }
619
620 /* Call _PSD for all CPUs */
621 for_each_possible_cpu(i) {
622 pr = per_cpu(processors, i);
623 if (!pr)
624 continue;
625
626 pr->performance = per_cpu_ptr(performance, i);
627 pdomain = &(pr->performance->domain_info);
628 if (acpi_processor_get_psd(pr->handle, pdomain)) {
629 retval = -EINVAL;
630 continue;
631 }
632 }
633 if (retval)
634 goto err_ret;
635
636 /*
637 * Now that we have _PSD data from all CPUs, lets setup P-state
638 * domain info.
639 */
640 for_each_possible_cpu(i) {
641 pr = per_cpu(processors, i);
642 if (!pr)
643 continue;
644
645 if (cpumask_test_cpu(i, covered_cpus))
646 continue;
647
648 pdomain = &(pr->performance->domain_info);
649 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
650 cpumask_set_cpu(i, covered_cpus);
651 if (pdomain->num_processors <= 1)
652 continue;
653
654 /* Validate the Domain info */
655 count_target = pdomain->num_processors;
656 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
657 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
658 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
659 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
660 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
661 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
662
663 for_each_possible_cpu(j) {
664 if (i == j)
665 continue;
666
667 match_pr = per_cpu(processors, j);
668 if (!match_pr)
669 continue;
670
671 match_pdomain = &(match_pr->performance->domain_info);
672 if (match_pdomain->domain != pdomain->domain)
673 continue;
674
675 /* Here i and j are in the same domain */
676
677 if (match_pdomain->num_processors != count_target) {
678 retval = -EINVAL;
679 goto err_ret;
680 }
681
682 if (pdomain->coord_type != match_pdomain->coord_type) {
683 retval = -EINVAL;
684 goto err_ret;
685 }
686
687 cpumask_set_cpu(j, covered_cpus);
688 cpumask_set_cpu(j, pr->performance->shared_cpu_map);
689 }
690
691 for_each_possible_cpu(j) {
692 if (i == j)
693 continue;
694
695 match_pr = per_cpu(processors, j);
696 if (!match_pr)
697 continue;
698
699 match_pdomain = &(match_pr->performance->domain_info);
700 if (match_pdomain->domain != pdomain->domain)
701 continue;
702
703 match_pr->performance->shared_type =
704 pr->performance->shared_type;
705 cpumask_copy(match_pr->performance->shared_cpu_map,
706 pr->performance->shared_cpu_map);
707 }
708 }
709
710err_ret:
711 for_each_possible_cpu(i) {
712 pr = per_cpu(processors, i);
713 if (!pr || !pr->performance)
714 continue;
715
716 /* Assume no coordination on any error parsing domain info */
717 if (retval) {
718 cpumask_clear(pr->performance->shared_cpu_map);
719 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
720 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_NONE;
721 }
722 pr->performance = NULL; /* Will be set for real in register */
723 }
724
725err_out:
726 mutex_unlock(&performance_mutex);
727 free_cpumask_var(covered_cpus);
728 return retval;
729}
730EXPORT_SYMBOL(acpi_processor_preregister_performance);
731
732int acpi_processor_register_performance(struct acpi_processor_performance
733 *performance, unsigned int cpu)
734{
735 struct acpi_processor *pr;
736
737 if (!acpi_processor_cpufreq_init)
738 return -EINVAL;
739
740 mutex_lock(&performance_mutex);
741
742 pr = per_cpu(processors, cpu);
743 if (!pr) {
744 mutex_unlock(&performance_mutex);
745 return -ENODEV;
746 }
747
748 if (pr->performance) {
749 mutex_unlock(&performance_mutex);
750 return -EBUSY;
751 }
752
753 WARN_ON(!performance);
754
755 pr->performance = performance;
756
757 if (acpi_processor_get_performance_info(pr)) {
758 pr->performance = NULL;
759 mutex_unlock(&performance_mutex);
760 return -EIO;
761 }
762
763 mutex_unlock(&performance_mutex);
764 return 0;
765}
766EXPORT_SYMBOL(acpi_processor_register_performance);
767
768void acpi_processor_unregister_performance(unsigned int cpu)
769{
770 struct acpi_processor *pr;
771
772 mutex_lock(&performance_mutex);
773
774 pr = per_cpu(processors, cpu);
775 if (!pr)
776 goto unlock;
777
778 if (pr->performance)
779 kfree(pr->performance->states);
780
781 pr->performance = NULL;
782
783unlock:
784 mutex_unlock(&performance_mutex);
785}
786EXPORT_SYMBOL(acpi_processor_unregister_performance);
787#endif
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $)
4 *
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
8 * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
9 * - Added processor hotplug support
10 */
11
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/cpufreq.h>
16#include <linux/slab.h>
17#include <linux/acpi.h>
18#include <acpi/processor.h>
19#ifdef CONFIG_X86
20#include <asm/cpufeature.h>
21#endif
22
23#define PREFIX "ACPI: "
24
25#define ACPI_PROCESSOR_CLASS "processor"
26#define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
27#define _COMPONENT ACPI_PROCESSOR_COMPONENT
28ACPI_MODULE_NAME("processor_perflib");
29
30static DEFINE_MUTEX(performance_mutex);
31
32/*
33 * _PPC support is implemented as a CPUfreq policy notifier:
34 * This means each time a CPUfreq driver registered also with
35 * the ACPI core is asked to change the speed policy, the maximum
36 * value is adjusted so that it is within the platform limit.
37 *
38 * Also, when a new platform limit value is detected, the CPUfreq
39 * policy is adjusted accordingly.
40 */
41
42/* ignore_ppc:
43 * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
44 * ignore _PPC
45 * 0 -> cpufreq low level drivers initialized -> consider _PPC values
46 * 1 -> ignore _PPC totally -> forced by user through boot param
47 */
48static int ignore_ppc = -1;
49module_param(ignore_ppc, int, 0644);
50MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
51 "limited by BIOS, this should help");
52
53static bool acpi_processor_ppc_in_use;
54
55static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
56{
57 acpi_status status = 0;
58 unsigned long long ppc = 0;
59 int ret;
60
61 if (!pr)
62 return -EINVAL;
63
64 /*
65 * _PPC indicates the maximum state currently supported by the platform
66 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
67 */
68 status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
69
70 if (status != AE_NOT_FOUND)
71 acpi_processor_ppc_in_use = true;
72
73 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
74 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
75 return -ENODEV;
76 }
77
78 pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
79 (int)ppc, ppc ? "" : "not");
80
81 pr->performance_platform_limit = (int)ppc;
82
83 if (ppc >= pr->performance->state_count ||
84 unlikely(!freq_qos_request_active(&pr->perflib_req)))
85 return 0;
86
87 ret = freq_qos_update_request(&pr->perflib_req,
88 pr->performance->states[ppc].core_frequency * 1000);
89 if (ret < 0) {
90 pr_warn("Failed to update perflib freq constraint: CPU%d (%d)\n",
91 pr->id, ret);
92 }
93
94 return 0;
95}
96
97#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
98/*
99 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
100 * @handle: ACPI processor handle
101 * @status: the status code of _PPC evaluation
102 * 0: success. OSPM is now using the performance state specificed.
103 * 1: failure. OSPM has not changed the number of P-states in use
104 */
105static void acpi_processor_ppc_ost(acpi_handle handle, int status)
106{
107 if (acpi_has_method(handle, "_OST"))
108 acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
109 status, NULL);
110}
111
112void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
113{
114 int ret;
115
116 if (ignore_ppc || !pr->performance) {
117 /*
118 * Only when it is notification event, the _OST object
119 * will be evaluated. Otherwise it is skipped.
120 */
121 if (event_flag)
122 acpi_processor_ppc_ost(pr->handle, 1);
123 return;
124 }
125
126 ret = acpi_processor_get_platform_limit(pr);
127 /*
128 * Only when it is notification event, the _OST object
129 * will be evaluated. Otherwise it is skipped.
130 */
131 if (event_flag) {
132 if (ret < 0)
133 acpi_processor_ppc_ost(pr->handle, 1);
134 else
135 acpi_processor_ppc_ost(pr->handle, 0);
136 }
137 if (ret >= 0)
138 cpufreq_update_limits(pr->id);
139}
140
141int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
142{
143 struct acpi_processor *pr;
144
145 pr = per_cpu(processors, cpu);
146 if (!pr || !pr->performance || !pr->performance->state_count)
147 return -ENODEV;
148 *limit = pr->performance->states[pr->performance_platform_limit].
149 core_frequency * 1000;
150 return 0;
151}
152EXPORT_SYMBOL(acpi_processor_get_bios_limit);
153
154void acpi_processor_ignore_ppc_init(void)
155{
156 if (ignore_ppc < 0)
157 ignore_ppc = 0;
158}
159
160void acpi_processor_ppc_init(struct cpufreq_policy *policy)
161{
162 unsigned int cpu;
163
164 for_each_cpu(cpu, policy->related_cpus) {
165 struct acpi_processor *pr = per_cpu(processors, cpu);
166 int ret;
167
168 if (!pr)
169 continue;
170
171 ret = freq_qos_add_request(&policy->constraints,
172 &pr->perflib_req,
173 FREQ_QOS_MAX, INT_MAX);
174 if (ret < 0)
175 pr_err("Failed to add freq constraint for CPU%d (%d)\n",
176 cpu, ret);
177 }
178}
179
180void acpi_processor_ppc_exit(struct cpufreq_policy *policy)
181{
182 unsigned int cpu;
183
184 for_each_cpu(cpu, policy->related_cpus) {
185 struct acpi_processor *pr = per_cpu(processors, cpu);
186
187 if (pr)
188 freq_qos_remove_request(&pr->perflib_req);
189 }
190}
191
192static int acpi_processor_get_performance_control(struct acpi_processor *pr)
193{
194 int result = 0;
195 acpi_status status = 0;
196 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
197 union acpi_object *pct = NULL;
198 union acpi_object obj = { 0 };
199
200
201 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
202 if (ACPI_FAILURE(status)) {
203 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
204 return -ENODEV;
205 }
206
207 pct = (union acpi_object *)buffer.pointer;
208 if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
209 || (pct->package.count != 2)) {
210 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
211 result = -EFAULT;
212 goto end;
213 }
214
215 /*
216 * control_register
217 */
218
219 obj = pct->package.elements[0];
220
221 if ((obj.type != ACPI_TYPE_BUFFER)
222 || (obj.buffer.length < sizeof(struct acpi_pct_register))
223 || (obj.buffer.pointer == NULL)) {
224 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
225 result = -EFAULT;
226 goto end;
227 }
228 memcpy(&pr->performance->control_register, obj.buffer.pointer,
229 sizeof(struct acpi_pct_register));
230
231 /*
232 * status_register
233 */
234
235 obj = pct->package.elements[1];
236
237 if ((obj.type != ACPI_TYPE_BUFFER)
238 || (obj.buffer.length < sizeof(struct acpi_pct_register))
239 || (obj.buffer.pointer == NULL)) {
240 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
241 result = -EFAULT;
242 goto end;
243 }
244
245 memcpy(&pr->performance->status_register, obj.buffer.pointer,
246 sizeof(struct acpi_pct_register));
247
248 end:
249 kfree(buffer.pointer);
250
251 return result;
252}
253
254#ifdef CONFIG_X86
255/*
256 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
257 * in their ACPI data. Calculate the real values and fix up the _PSS data.
258 */
259static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
260{
261 u32 hi, lo, fid, did;
262 int index = px->control & 0x00000007;
263
264 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
265 return;
266
267 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
268 || boot_cpu_data.x86 == 0x11) {
269 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
270 /*
271 * MSR C001_0064+:
272 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
273 */
274 if (!(hi & BIT(31)))
275 return;
276
277 fid = lo & 0x3f;
278 did = (lo >> 6) & 7;
279 if (boot_cpu_data.x86 == 0x10)
280 px->core_frequency = (100 * (fid + 0x10)) >> did;
281 else
282 px->core_frequency = (100 * (fid + 8)) >> did;
283 }
284}
285#else
286static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
287#endif
288
289static int acpi_processor_get_performance_states(struct acpi_processor *pr)
290{
291 int result = 0;
292 acpi_status status = AE_OK;
293 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
294 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
295 struct acpi_buffer state = { 0, NULL };
296 union acpi_object *pss = NULL;
297 int i;
298 int last_invalid = -1;
299
300
301 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
302 if (ACPI_FAILURE(status)) {
303 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
304 return -ENODEV;
305 }
306
307 pss = buffer.pointer;
308 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
309 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
310 result = -EFAULT;
311 goto end;
312 }
313
314 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
315 pss->package.count));
316
317 pr->performance->state_count = pss->package.count;
318 pr->performance->states =
319 kmalloc_array(pss->package.count,
320 sizeof(struct acpi_processor_px),
321 GFP_KERNEL);
322 if (!pr->performance->states) {
323 result = -ENOMEM;
324 goto end;
325 }
326
327 for (i = 0; i < pr->performance->state_count; i++) {
328
329 struct acpi_processor_px *px = &(pr->performance->states[i]);
330
331 state.length = sizeof(struct acpi_processor_px);
332 state.pointer = px;
333
334 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
335
336 status = acpi_extract_package(&(pss->package.elements[i]),
337 &format, &state);
338 if (ACPI_FAILURE(status)) {
339 ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
340 result = -EFAULT;
341 kfree(pr->performance->states);
342 goto end;
343 }
344
345 amd_fixup_frequency(px, i);
346
347 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
348 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
349 i,
350 (u32) px->core_frequency,
351 (u32) px->power,
352 (u32) px->transition_latency,
353 (u32) px->bus_master_latency,
354 (u32) px->control, (u32) px->status));
355
356 /*
357 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
358 */
359 if (!px->core_frequency ||
360 ((u32)(px->core_frequency * 1000) !=
361 (px->core_frequency * 1000))) {
362 printk(KERN_ERR FW_BUG PREFIX
363 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
364 pr->id, px->core_frequency);
365 if (last_invalid == -1)
366 last_invalid = i;
367 } else {
368 if (last_invalid != -1) {
369 /*
370 * Copy this valid entry over last_invalid entry
371 */
372 memcpy(&(pr->performance->states[last_invalid]),
373 px, sizeof(struct acpi_processor_px));
374 ++last_invalid;
375 }
376 }
377 }
378
379 if (last_invalid == 0) {
380 printk(KERN_ERR FW_BUG PREFIX
381 "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
382 result = -EFAULT;
383 kfree(pr->performance->states);
384 pr->performance->states = NULL;
385 }
386
387 if (last_invalid > 0)
388 pr->performance->state_count = last_invalid;
389
390 end:
391 kfree(buffer.pointer);
392
393 return result;
394}
395
396int acpi_processor_get_performance_info(struct acpi_processor *pr)
397{
398 int result = 0;
399
400 if (!pr || !pr->performance || !pr->handle)
401 return -EINVAL;
402
403 if (!acpi_has_method(pr->handle, "_PCT")) {
404 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
405 "ACPI-based processor performance control unavailable\n"));
406 return -ENODEV;
407 }
408
409 result = acpi_processor_get_performance_control(pr);
410 if (result)
411 goto update_bios;
412
413 result = acpi_processor_get_performance_states(pr);
414 if (result)
415 goto update_bios;
416
417 /* We need to call _PPC once when cpufreq starts */
418 if (ignore_ppc != 1)
419 result = acpi_processor_get_platform_limit(pr);
420
421 return result;
422
423 /*
424 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
425 * the BIOS is older than the CPU and does not know its frequencies
426 */
427 update_bios:
428#ifdef CONFIG_X86
429 if (acpi_has_method(pr->handle, "_PPC")) {
430 if(boot_cpu_has(X86_FEATURE_EST))
431 printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
432 "frequency support\n");
433 }
434#endif
435 return result;
436}
437EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
438
439int acpi_processor_pstate_control(void)
440{
441 acpi_status status;
442
443 if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
444 return 0;
445
446 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
447 "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
448 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
449
450 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
451 (u32)acpi_gbl_FADT.pstate_control, 8);
452 if (ACPI_SUCCESS(status))
453 return 1;
454
455 ACPI_EXCEPTION((AE_INFO, status,
456 "Failed to write pstate_control [0x%x] to smi_command [0x%x]",
457 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
458 return -EIO;
459}
460
461int acpi_processor_notify_smm(struct module *calling_module)
462{
463 static int is_done = 0;
464 int result;
465
466 if (!acpi_processor_cpufreq_init)
467 return -EBUSY;
468
469 if (!try_module_get(calling_module))
470 return -EINVAL;
471
472 /* is_done is set to negative if an error occurred,
473 * and to postitive if _no_ error occurred, but SMM
474 * was already notified. This avoids double notification
475 * which might lead to unexpected results...
476 */
477 if (is_done > 0) {
478 module_put(calling_module);
479 return 0;
480 } else if (is_done < 0) {
481 module_put(calling_module);
482 return is_done;
483 }
484
485 is_done = -EIO;
486
487 result = acpi_processor_pstate_control();
488 if (!result) {
489 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
490 module_put(calling_module);
491 return 0;
492 }
493 if (result < 0) {
494 module_put(calling_module);
495 return result;
496 }
497
498 /* Success. If there's no _PPC, we need to fear nothing, so
499 * we can allow the cpufreq driver to be rmmod'ed. */
500 is_done = 1;
501
502 if (!acpi_processor_ppc_in_use)
503 module_put(calling_module);
504
505 return 0;
506}
507
508EXPORT_SYMBOL(acpi_processor_notify_smm);
509
510int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)
511{
512 int result = 0;
513 acpi_status status = AE_OK;
514 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
515 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
516 struct acpi_buffer state = {0, NULL};
517 union acpi_object *psd = NULL;
518
519 status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer);
520 if (ACPI_FAILURE(status)) {
521 return -ENODEV;
522 }
523
524 psd = buffer.pointer;
525 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
526 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
527 result = -EFAULT;
528 goto end;
529 }
530
531 if (psd->package.count != 1) {
532 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
533 result = -EFAULT;
534 goto end;
535 }
536
537 state.length = sizeof(struct acpi_psd_package);
538 state.pointer = pdomain;
539
540 status = acpi_extract_package(&(psd->package.elements[0]),
541 &format, &state);
542 if (ACPI_FAILURE(status)) {
543 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
544 result = -EFAULT;
545 goto end;
546 }
547
548 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
549 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
550 result = -EFAULT;
551 goto end;
552 }
553
554 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
555 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
556 result = -EFAULT;
557 goto end;
558 }
559
560 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
561 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
562 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
563 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
564 result = -EFAULT;
565 goto end;
566 }
567end:
568 kfree(buffer.pointer);
569 return result;
570}
571EXPORT_SYMBOL(acpi_processor_get_psd);
572
573int acpi_processor_preregister_performance(
574 struct acpi_processor_performance __percpu *performance)
575{
576 int count_target;
577 int retval = 0;
578 unsigned int i, j;
579 cpumask_var_t covered_cpus;
580 struct acpi_processor *pr;
581 struct acpi_psd_package *pdomain;
582 struct acpi_processor *match_pr;
583 struct acpi_psd_package *match_pdomain;
584
585 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
586 return -ENOMEM;
587
588 mutex_lock(&performance_mutex);
589
590 /*
591 * Check if another driver has already registered, and abort before
592 * changing pr->performance if it has. Check input data as well.
593 */
594 for_each_possible_cpu(i) {
595 pr = per_cpu(processors, i);
596 if (!pr) {
597 /* Look only at processors in ACPI namespace */
598 continue;
599 }
600
601 if (pr->performance) {
602 retval = -EBUSY;
603 goto err_out;
604 }
605
606 if (!performance || !per_cpu_ptr(performance, i)) {
607 retval = -EINVAL;
608 goto err_out;
609 }
610 }
611
612 /* Call _PSD for all CPUs */
613 for_each_possible_cpu(i) {
614 pr = per_cpu(processors, i);
615 if (!pr)
616 continue;
617
618 pr->performance = per_cpu_ptr(performance, i);
619 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
620 pdomain = &(pr->performance->domain_info);
621 if (acpi_processor_get_psd(pr->handle, pdomain)) {
622 retval = -EINVAL;
623 continue;
624 }
625 }
626 if (retval)
627 goto err_ret;
628
629 /*
630 * Now that we have _PSD data from all CPUs, lets setup P-state
631 * domain info.
632 */
633 for_each_possible_cpu(i) {
634 pr = per_cpu(processors, i);
635 if (!pr)
636 continue;
637
638 if (cpumask_test_cpu(i, covered_cpus))
639 continue;
640
641 pdomain = &(pr->performance->domain_info);
642 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
643 cpumask_set_cpu(i, covered_cpus);
644 if (pdomain->num_processors <= 1)
645 continue;
646
647 /* Validate the Domain info */
648 count_target = pdomain->num_processors;
649 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
650 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
651 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
652 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
653 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
654 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
655
656 for_each_possible_cpu(j) {
657 if (i == j)
658 continue;
659
660 match_pr = per_cpu(processors, j);
661 if (!match_pr)
662 continue;
663
664 match_pdomain = &(match_pr->performance->domain_info);
665 if (match_pdomain->domain != pdomain->domain)
666 continue;
667
668 /* Here i and j are in the same domain */
669
670 if (match_pdomain->num_processors != count_target) {
671 retval = -EINVAL;
672 goto err_ret;
673 }
674
675 if (pdomain->coord_type != match_pdomain->coord_type) {
676 retval = -EINVAL;
677 goto err_ret;
678 }
679
680 cpumask_set_cpu(j, covered_cpus);
681 cpumask_set_cpu(j, pr->performance->shared_cpu_map);
682 }
683
684 for_each_possible_cpu(j) {
685 if (i == j)
686 continue;
687
688 match_pr = per_cpu(processors, j);
689 if (!match_pr)
690 continue;
691
692 match_pdomain = &(match_pr->performance->domain_info);
693 if (match_pdomain->domain != pdomain->domain)
694 continue;
695
696 match_pr->performance->shared_type =
697 pr->performance->shared_type;
698 cpumask_copy(match_pr->performance->shared_cpu_map,
699 pr->performance->shared_cpu_map);
700 }
701 }
702
703err_ret:
704 for_each_possible_cpu(i) {
705 pr = per_cpu(processors, i);
706 if (!pr || !pr->performance)
707 continue;
708
709 /* Assume no coordination on any error parsing domain info */
710 if (retval) {
711 cpumask_clear(pr->performance->shared_cpu_map);
712 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
713 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
714 }
715 pr->performance = NULL; /* Will be set for real in register */
716 }
717
718err_out:
719 mutex_unlock(&performance_mutex);
720 free_cpumask_var(covered_cpus);
721 return retval;
722}
723EXPORT_SYMBOL(acpi_processor_preregister_performance);
724
725int
726acpi_processor_register_performance(struct acpi_processor_performance
727 *performance, unsigned int cpu)
728{
729 struct acpi_processor *pr;
730
731 if (!acpi_processor_cpufreq_init)
732 return -EINVAL;
733
734 mutex_lock(&performance_mutex);
735
736 pr = per_cpu(processors, cpu);
737 if (!pr) {
738 mutex_unlock(&performance_mutex);
739 return -ENODEV;
740 }
741
742 if (pr->performance) {
743 mutex_unlock(&performance_mutex);
744 return -EBUSY;
745 }
746
747 WARN_ON(!performance);
748
749 pr->performance = performance;
750
751 if (acpi_processor_get_performance_info(pr)) {
752 pr->performance = NULL;
753 mutex_unlock(&performance_mutex);
754 return -EIO;
755 }
756
757 mutex_unlock(&performance_mutex);
758 return 0;
759}
760
761EXPORT_SYMBOL(acpi_processor_register_performance);
762
763void acpi_processor_unregister_performance(unsigned int cpu)
764{
765 struct acpi_processor *pr;
766
767 mutex_lock(&performance_mutex);
768
769 pr = per_cpu(processors, cpu);
770 if (!pr) {
771 mutex_unlock(&performance_mutex);
772 return;
773 }
774
775 if (pr->performance)
776 kfree(pr->performance->states);
777 pr->performance = NULL;
778
779 mutex_unlock(&performance_mutex);
780
781 return;
782}
783
784EXPORT_SYMBOL(acpi_processor_unregister_performance);