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#include <asm/msr.h>
24#endif
25
26#define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
27
28/*
29 * _PPC support is implemented as a CPUfreq policy notifier:
30 * This means each time a CPUfreq driver registered also with
31 * the ACPI core is asked to change the speed policy, the maximum
32 * value is adjusted so that it is within the platform limit.
33 *
34 * Also, when a new platform limit value is detected, the CPUfreq
35 * policy is adjusted accordingly.
36 */
37
38/* ignore_ppc:
39 * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
40 * ignore _PPC
41 * 0 -> cpufreq low level drivers initialized -> consider _PPC values
42 * 1 -> ignore _PPC totally -> forced by user through boot param
43 */
44static int ignore_ppc = -1;
45module_param(ignore_ppc, int, 0644);
46MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
47 "limited by BIOS, this should help");
48
49static bool acpi_processor_ppc_in_use;
50
51static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
52{
53 acpi_status status = 0;
54 unsigned long long ppc = 0;
55 s32 qos_value;
56 int index;
57 int ret;
58
59 if (!pr)
60 return -EINVAL;
61
62 /*
63 * _PPC indicates the maximum state currently supported by the platform
64 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
65 */
66 status = acpi_evaluate_integer(handle: pr->handle, pathname: "_PPC", NULL, data: &ppc);
67 if (status != AE_NOT_FOUND) {
68 acpi_processor_ppc_in_use = true;
69
70 if (ACPI_FAILURE(status)) {
71 acpi_evaluation_failure_warn(handle: pr->handle, name: "_PPC", status);
72 return -ENODEV;
73 }
74 }
75
76 index = ppc;
77
78 if (pr->performance_platform_limit == index ||
79 ppc >= pr->performance->state_count)
80 return 0;
81
82 pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
83 index, index ? "is" : "is not");
84
85 pr->performance_platform_limit = index;
86
87 if (unlikely(!freq_qos_request_active(&pr->perflib_req)))
88 return 0;
89
90 /*
91 * If _PPC returns 0, it means that all of the available states can be
92 * used ("no limit").
93 */
94 if (index == 0)
95 qos_value = FREQ_QOS_MAX_DEFAULT_VALUE;
96 else
97 qos_value = pr->performance->states[index].core_frequency * 1000;
98
99 ret = freq_qos_update_request(req: &pr->perflib_req, new_value: qos_value);
100 if (ret < 0) {
101 pr_warn("Failed to update perflib freq constraint: CPU%d (%d)\n",
102 pr->id, ret);
103 }
104
105 return 0;
106}
107
108#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
109/*
110 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
111 * @handle: ACPI processor handle
112 * @status: the status code of _PPC evaluation
113 * 0: success. OSPM is now using the performance state specified.
114 * 1: failure. OSPM has not changed the number of P-states in use
115 */
116static void acpi_processor_ppc_ost(acpi_handle handle, int status)
117{
118 if (acpi_has_method(handle, name: "_OST"))
119 acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
120 status_code: status, NULL);
121}
122
123void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
124{
125 int ret;
126
127 if (ignore_ppc || !pr->performance) {
128 /*
129 * Only when it is notification event, the _OST object
130 * will be evaluated. Otherwise it is skipped.
131 */
132 if (event_flag)
133 acpi_processor_ppc_ost(handle: pr->handle, status: 1);
134 return;
135 }
136
137 ret = acpi_processor_get_platform_limit(pr);
138 /*
139 * Only when it is notification event, the _OST object
140 * will be evaluated. Otherwise it is skipped.
141 */
142 if (event_flag) {
143 if (ret < 0)
144 acpi_processor_ppc_ost(handle: pr->handle, status: 1);
145 else
146 acpi_processor_ppc_ost(handle: pr->handle, status: 0);
147 }
148 if (ret >= 0)
149 cpufreq_update_limits(cpu: pr->id);
150}
151
152int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
153{
154 struct acpi_processor *pr;
155
156 pr = per_cpu(processors, cpu);
157 if (!pr || !pr->performance || !pr->performance->state_count)
158 return -ENODEV;
159
160 *limit = pr->performance->states[pr->performance_platform_limit].
161 core_frequency * 1000;
162 return 0;
163}
164EXPORT_SYMBOL(acpi_processor_get_bios_limit);
165
166void acpi_processor_ignore_ppc_init(void)
167{
168 if (ignore_ppc < 0)
169 ignore_ppc = 0;
170}
171
172void acpi_processor_ppc_init(struct cpufreq_policy *policy)
173{
174 unsigned int cpu;
175
176 if (ignore_ppc == 1)
177 return;
178
179 for_each_cpu(cpu, policy->related_cpus) {
180 struct acpi_processor *pr = per_cpu(processors, cpu);
181 int ret;
182
183 if (!pr)
184 continue;
185
186 /*
187 * Reset performance_platform_limit in case there is a stale
188 * value in it, so as to make it match the "no limit" QoS value
189 * below.
190 */
191 pr->performance_platform_limit = 0;
192
193 ret = freq_qos_add_request(qos: &policy->constraints,
194 req: &pr->perflib_req, type: FREQ_QOS_MAX,
195 FREQ_QOS_MAX_DEFAULT_VALUE);
196 if (ret < 0)
197 pr_err("Failed to add freq constraint for CPU%d (%d)\n",
198 cpu, ret);
199
200 if (!pr->performance)
201 continue;
202
203 ret = acpi_processor_get_platform_limit(pr);
204 if (ret)
205 pr_err("Failed to update freq constraint for CPU%d (%d)\n",
206 cpu, ret);
207 }
208}
209
210void acpi_processor_ppc_exit(struct cpufreq_policy *policy)
211{
212 unsigned int cpu;
213
214 for_each_cpu(cpu, policy->related_cpus) {
215 struct acpi_processor *pr = per_cpu(processors, cpu);
216
217 if (pr)
218 freq_qos_remove_request(req: &pr->perflib_req);
219 }
220}
221
222#ifdef CONFIG_X86
223
224static DEFINE_MUTEX(performance_mutex);
225
226static int acpi_processor_get_performance_control(struct acpi_processor *pr)
227{
228 int result = 0;
229 acpi_status status = 0;
230 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
231 union acpi_object *pct = NULL;
232 union acpi_object obj = { 0 };
233
234 status = acpi_evaluate_object(object: pr->handle, pathname: "_PCT", NULL, return_object_buffer: &buffer);
235 if (ACPI_FAILURE(status)) {
236 acpi_evaluation_failure_warn(handle: pr->handle, name: "_PCT", status);
237 return -ENODEV;
238 }
239
240 pct = (union acpi_object *)buffer.pointer;
241 if (!pct || pct->type != ACPI_TYPE_PACKAGE || pct->package.count != 2) {
242 pr_err("Invalid _PCT data\n");
243 result = -EFAULT;
244 goto end;
245 }
246
247 /*
248 * control_register
249 */
250
251 obj = pct->package.elements[0];
252
253 if (!obj.buffer.pointer || obj.type != ACPI_TYPE_BUFFER ||
254 obj.buffer.length < sizeof(struct acpi_pct_register)) {
255 pr_err("Invalid _PCT data (control_register)\n");
256 result = -EFAULT;
257 goto end;
258 }
259 memcpy(to: &pr->performance->control_register, from: obj.buffer.pointer,
260 len: sizeof(struct acpi_pct_register));
261
262 /*
263 * status_register
264 */
265
266 obj = pct->package.elements[1];
267
268 if (!obj.buffer.pointer || obj.type != ACPI_TYPE_BUFFER ||
269 obj.buffer.length < sizeof(struct acpi_pct_register)) {
270 pr_err("Invalid _PCT data (status_register)\n");
271 result = -EFAULT;
272 goto end;
273 }
274
275 memcpy(to: &pr->performance->status_register, from: obj.buffer.pointer,
276 len: sizeof(struct acpi_pct_register));
277
278end:
279 kfree(objp: buffer.pointer);
280
281 return result;
282}
283
284/*
285 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
286 * in their ACPI data. Calculate the real values and fix up the _PSS data.
287 */
288static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
289{
290 u32 hi, lo, fid, did;
291 int index = px->control & 0x00000007;
292
293 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
294 return;
295
296 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) ||
297 boot_cpu_data.x86 == 0x11) {
298 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
299 /*
300 * MSR C001_0064+:
301 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
302 */
303 if (!(hi & BIT(31)))
304 return;
305
306 fid = lo & 0x3f;
307 did = (lo >> 6) & 7;
308 if (boot_cpu_data.x86 == 0x10)
309 px->core_frequency = (100 * (fid + 0x10)) >> did;
310 else
311 px->core_frequency = (100 * (fid + 8)) >> did;
312 }
313}
314
315static int acpi_processor_get_performance_states(struct acpi_processor *pr)
316{
317 int result = 0;
318 acpi_status status = AE_OK;
319 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
320 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
321 struct acpi_buffer state = { 0, NULL };
322 union acpi_object *pss = NULL;
323 int i;
324 int last_invalid = -1;
325
326 status = acpi_evaluate_object(object: pr->handle, pathname: "_PSS", NULL, return_object_buffer: &buffer);
327 if (ACPI_FAILURE(status)) {
328 acpi_evaluation_failure_warn(handle: pr->handle, name: "_PSS", status);
329 return -ENODEV;
330 }
331
332 pss = buffer.pointer;
333 if (!pss || pss->type != ACPI_TYPE_PACKAGE) {
334 pr_err("Invalid _PSS data\n");
335 result = -EFAULT;
336 goto end;
337 }
338
339 acpi_handle_debug(pr->handle, "Found %d performance states\n",
340 pss->package.count);
341
342 pr->performance->state_count = pss->package.count;
343 pr->performance->states =
344 kmalloc_array(pss->package.count,
345 sizeof(struct acpi_processor_px),
346 GFP_KERNEL);
347 if (!pr->performance->states) {
348 result = -ENOMEM;
349 goto end;
350 }
351
352 for (i = 0; i < pr->performance->state_count; i++) {
353
354 struct acpi_processor_px *px = &(pr->performance->states[i]);
355
356 state.length = sizeof(struct acpi_processor_px);
357 state.pointer = px;
358
359 acpi_handle_debug(pr->handle, "Extracting state %d\n", i);
360
361 status = acpi_extract_package(package: &(pss->package.elements[i]),
362 format: &format, buffer: &state);
363 if (ACPI_FAILURE(status)) {
364 acpi_handle_warn(pr->handle, "Invalid _PSS data: %s\n",
365 acpi_format_exception(status));
366 result = -EFAULT;
367 kfree(objp: pr->performance->states);
368 goto end;
369 }
370
371 amd_fixup_frequency(px, i);
372
373 acpi_handle_debug(pr->handle,
374 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
375 i,
376 (u32) px->core_frequency,
377 (u32) px->power,
378 (u32) px->transition_latency,
379 (u32) px->bus_master_latency,
380 (u32) px->control, (u32) px->status);
381
382 /*
383 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
384 */
385 if (!px->core_frequency ||
386 (u32)(px->core_frequency * 1000) != px->core_frequency * 1000) {
387 pr_err(FW_BUG
388 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
389 pr->id, px->core_frequency);
390 if (last_invalid == -1)
391 last_invalid = i;
392 } else {
393 if (last_invalid != -1) {
394 /*
395 * Copy this valid entry over last_invalid entry
396 */
397 memcpy(to: &(pr->performance->states[last_invalid]),
398 from: px, len: sizeof(struct acpi_processor_px));
399 ++last_invalid;
400 }
401 }
402 }
403
404 if (last_invalid == 0) {
405 pr_err(FW_BUG
406 "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
407 result = -EFAULT;
408 kfree(objp: pr->performance->states);
409 pr->performance->states = NULL;
410 }
411
412 if (last_invalid > 0)
413 pr->performance->state_count = last_invalid;
414
415end:
416 kfree(objp: buffer.pointer);
417
418 return result;
419}
420
421int acpi_processor_get_performance_info(struct acpi_processor *pr)
422{
423 int result = 0;
424
425 if (!pr || !pr->performance || !pr->handle)
426 return -EINVAL;
427
428 if (!acpi_has_method(handle: pr->handle, name: "_PCT")) {
429 acpi_handle_debug(pr->handle,
430 "ACPI-based processor performance control unavailable\n");
431 return -ENODEV;
432 }
433
434 result = acpi_processor_get_performance_control(pr);
435 if (result)
436 goto update_bios;
437
438 result = acpi_processor_get_performance_states(pr);
439 if (result)
440 goto update_bios;
441
442 /* We need to call _PPC once when cpufreq starts */
443 if (ignore_ppc != 1)
444 result = acpi_processor_get_platform_limit(pr);
445
446 return result;
447
448 /*
449 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
450 * the BIOS is older than the CPU and does not know its frequencies
451 */
452 update_bios:
453 if (acpi_has_method(handle: pr->handle, name: "_PPC")) {
454 if(boot_cpu_has(X86_FEATURE_EST))
455 pr_warn(FW_BUG "BIOS needs update for CPU "
456 "frequency support\n");
457 }
458 return result;
459}
460EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
461
462int acpi_processor_pstate_control(void)
463{
464 acpi_status status;
465
466 if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
467 return 0;
468
469 pr_debug("Writing pstate_control [0x%x] to smi_command [0x%x]\n",
470 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command);
471
472 status = acpi_os_write_port(address: acpi_gbl_FADT.smi_command,
473 value: (u32)acpi_gbl_FADT.pstate_control, width: 8);
474 if (ACPI_SUCCESS(status))
475 return 1;
476
477 pr_warn("Failed to write pstate_control [0x%x] to smi_command [0x%x]: %s\n",
478 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command,
479 acpi_format_exception(status));
480 return -EIO;
481}
482
483int acpi_processor_notify_smm(struct module *calling_module)
484{
485 static int is_done;
486 int result = 0;
487
488 if (!acpi_processor_cpufreq_init)
489 return -EBUSY;
490
491 if (!try_module_get(module: calling_module))
492 return -EINVAL;
493
494 /*
495 * is_done is set to negative if an error occurs and to 1 if no error
496 * occurrs, but SMM has been notified already. This avoids repeated
497 * notification which might lead to unexpected results.
498 */
499 if (is_done != 0) {
500 if (is_done < 0)
501 result = is_done;
502
503 goto out_put;
504 }
505
506 result = acpi_processor_pstate_control();
507 if (result <= 0) {
508 if (result) {
509 is_done = result;
510 } else {
511 pr_debug("No SMI port or pstate_control\n");
512 is_done = 1;
513 }
514 goto out_put;
515 }
516
517 is_done = 1;
518 /*
519 * Success. If there _PPC, unloading the cpufreq driver would be risky,
520 * so disallow it in that case.
521 */
522 if (acpi_processor_ppc_in_use)
523 return 0;
524
525out_put:
526 module_put(module: calling_module);
527 return result;
528}
529EXPORT_SYMBOL(acpi_processor_notify_smm);
530
531int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)
532{
533 int result = 0;
534 acpi_status status = AE_OK;
535 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
536 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
537 struct acpi_buffer state = {0, NULL};
538 union acpi_object *psd = NULL;
539
540 status = acpi_evaluate_object(object: handle, pathname: "_PSD", NULL, return_object_buffer: &buffer);
541 if (ACPI_FAILURE(status)) {
542 return -ENODEV;
543 }
544
545 psd = buffer.pointer;
546 if (!psd || psd->type != ACPI_TYPE_PACKAGE) {
547 pr_err("Invalid _PSD data\n");
548 result = -EFAULT;
549 goto end;
550 }
551
552 if (psd->package.count != 1) {
553 pr_err("Invalid _PSD data\n");
554 result = -EFAULT;
555 goto end;
556 }
557
558 state.length = sizeof(struct acpi_psd_package);
559 state.pointer = pdomain;
560
561 status = acpi_extract_package(package: &(psd->package.elements[0]), format: &format, buffer: &state);
562 if (ACPI_FAILURE(status)) {
563 pr_err("Invalid _PSD data\n");
564 result = -EFAULT;
565 goto end;
566 }
567
568 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
569 pr_err("Unknown _PSD:num_entries\n");
570 result = -EFAULT;
571 goto end;
572 }
573
574 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
575 pr_err("Unknown _PSD:revision\n");
576 result = -EFAULT;
577 goto end;
578 }
579
580 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
581 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
582 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
583 pr_err("Invalid _PSD:coord_type\n");
584 result = -EFAULT;
585 goto end;
586 }
587end:
588 kfree(objp: buffer.pointer);
589 return result;
590}
591EXPORT_SYMBOL(acpi_processor_get_psd);
592
593int acpi_processor_preregister_performance(
594 struct acpi_processor_performance __percpu *performance)
595{
596 int count_target;
597 int retval = 0;
598 unsigned int i, j;
599 cpumask_var_t covered_cpus;
600 struct acpi_processor *pr;
601 struct acpi_psd_package *pdomain;
602 struct acpi_processor *match_pr;
603 struct acpi_psd_package *match_pdomain;
604
605 if (!zalloc_cpumask_var(mask: &covered_cpus, GFP_KERNEL))
606 return -ENOMEM;
607
608 mutex_lock(lock: &performance_mutex);
609
610 /*
611 * Check if another driver has already registered, and abort before
612 * changing pr->performance if it has. Check input data as well.
613 */
614 for_each_possible_cpu(i) {
615 pr = per_cpu(processors, i);
616 if (!pr) {
617 /* Look only at processors in ACPI namespace */
618 continue;
619 }
620
621 if (pr->performance) {
622 retval = -EBUSY;
623 goto err_out;
624 }
625
626 if (!performance || !per_cpu_ptr(performance, i)) {
627 retval = -EINVAL;
628 goto err_out;
629 }
630 }
631
632 /* Call _PSD for all CPUs */
633 for_each_possible_cpu(i) {
634 pr = per_cpu(processors, i);
635 if (!pr)
636 continue;
637
638 pr->performance = per_cpu_ptr(performance, i);
639 pdomain = &(pr->performance->domain_info);
640 if (acpi_processor_get_psd(pr->handle, pdomain)) {
641 retval = -EINVAL;
642 continue;
643 }
644 }
645 if (retval)
646 goto err_ret;
647
648 /*
649 * Now that we have _PSD data from all CPUs, lets setup P-state
650 * domain info.
651 */
652 for_each_possible_cpu(i) {
653 pr = per_cpu(processors, i);
654 if (!pr)
655 continue;
656
657 if (cpumask_test_cpu(cpu: i, cpumask: covered_cpus))
658 continue;
659
660 pdomain = &(pr->performance->domain_info);
661 cpumask_set_cpu(cpu: i, dstp: pr->performance->shared_cpu_map);
662 cpumask_set_cpu(cpu: i, dstp: covered_cpus);
663 if (pdomain->num_processors <= 1)
664 continue;
665
666 /* Validate the Domain info */
667 count_target = pdomain->num_processors;
668 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
669 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
670 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
671 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
672 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
673 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
674
675 for_each_possible_cpu(j) {
676 if (i == j)
677 continue;
678
679 match_pr = per_cpu(processors, j);
680 if (!match_pr)
681 continue;
682
683 match_pdomain = &(match_pr->performance->domain_info);
684 if (match_pdomain->domain != pdomain->domain)
685 continue;
686
687 /* Here i and j are in the same domain */
688
689 if (match_pdomain->num_processors != count_target) {
690 retval = -EINVAL;
691 goto err_ret;
692 }
693
694 if (pdomain->coord_type != match_pdomain->coord_type) {
695 retval = -EINVAL;
696 goto err_ret;
697 }
698
699 cpumask_set_cpu(cpu: j, dstp: covered_cpus);
700 cpumask_set_cpu(cpu: j, dstp: pr->performance->shared_cpu_map);
701 }
702
703 for_each_possible_cpu(j) {
704 if (i == j)
705 continue;
706
707 match_pr = per_cpu(processors, j);
708 if (!match_pr)
709 continue;
710
711 match_pdomain = &(match_pr->performance->domain_info);
712 if (match_pdomain->domain != pdomain->domain)
713 continue;
714
715 match_pr->performance->shared_type =
716 pr->performance->shared_type;
717 cpumask_copy(dstp: match_pr->performance->shared_cpu_map,
718 srcp: pr->performance->shared_cpu_map);
719 }
720 }
721
722err_ret:
723 for_each_possible_cpu(i) {
724 pr = per_cpu(processors, i);
725 if (!pr || !pr->performance)
726 continue;
727
728 /* Assume no coordination on any error parsing domain info */
729 if (retval) {
730 cpumask_clear(dstp: pr->performance->shared_cpu_map);
731 cpumask_set_cpu(cpu: i, dstp: pr->performance->shared_cpu_map);
732 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_NONE;
733 }
734 pr->performance = NULL; /* Will be set for real in register */
735 }
736
737err_out:
738 mutex_unlock(lock: &performance_mutex);
739 free_cpumask_var(mask: covered_cpus);
740 return retval;
741}
742EXPORT_SYMBOL(acpi_processor_preregister_performance);
743
744int acpi_processor_register_performance(struct acpi_processor_performance
745 *performance, unsigned int cpu)
746{
747 struct acpi_processor *pr;
748
749 if (!acpi_processor_cpufreq_init)
750 return -EINVAL;
751
752 mutex_lock(lock: &performance_mutex);
753
754 pr = per_cpu(processors, cpu);
755 if (!pr) {
756 mutex_unlock(lock: &performance_mutex);
757 return -ENODEV;
758 }
759
760 if (pr->performance) {
761 mutex_unlock(lock: &performance_mutex);
762 return -EBUSY;
763 }
764
765 WARN_ON(!performance);
766
767 pr->performance = performance;
768
769 if (acpi_processor_get_performance_info(pr)) {
770 pr->performance = NULL;
771 mutex_unlock(lock: &performance_mutex);
772 return -EIO;
773 }
774
775 mutex_unlock(lock: &performance_mutex);
776 return 0;
777}
778EXPORT_SYMBOL(acpi_processor_register_performance);
779
780void acpi_processor_unregister_performance(unsigned int cpu)
781{
782 struct acpi_processor *pr;
783
784 mutex_lock(lock: &performance_mutex);
785
786 pr = per_cpu(processors, cpu);
787 if (!pr)
788 goto unlock;
789
790 if (pr->performance)
791 kfree(objp: pr->performance->states);
792
793 pr->performance = NULL;
794
795unlock:
796 mutex_unlock(lock: &performance_mutex);
797}
798EXPORT_SYMBOL(acpi_processor_unregister_performance);
799#endif
800