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1/*
2 * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $)
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
7 * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
8 * - Added processor hotplug support
9 *
10 *
11 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or (at
16 * your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful, but
19 * WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License along
24 * with this program; if not, write to the Free Software Foundation, Inc.,
25 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
26 *
27 */
28
29#include <linux/kernel.h>
30#include <linux/module.h>
31#include <linux/init.h>
32#include <linux/cpufreq.h>
33#include <linux/slab.h>
34
35#ifdef CONFIG_X86
36#include <asm/cpufeature.h>
37#endif
38
39#include <acpi/acpi_bus.h>
40#include <acpi/acpi_drivers.h>
41#include <acpi/processor.h>
42
43#define PREFIX "ACPI: "
44
45#define ACPI_PROCESSOR_CLASS "processor"
46#define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
47#define _COMPONENT ACPI_PROCESSOR_COMPONENT
48ACPI_MODULE_NAME("processor_perflib");
49
50static DEFINE_MUTEX(performance_mutex);
51
52/*
53 * _PPC support is implemented as a CPUfreq policy notifier:
54 * This means each time a CPUfreq driver registered also with
55 * the ACPI core is asked to change the speed policy, the maximum
56 * value is adjusted so that it is within the platform limit.
57 *
58 * Also, when a new platform limit value is detected, the CPUfreq
59 * policy is adjusted accordingly.
60 */
61
62/* ignore_ppc:
63 * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
64 * ignore _PPC
65 * 0 -> cpufreq low level drivers initialized -> consider _PPC values
66 * 1 -> ignore _PPC totally -> forced by user through boot param
67 */
68static int ignore_ppc = -1;
69module_param(ignore_ppc, int, 0644);
70MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
71 "limited by BIOS, this should help");
72
73#define PPC_REGISTERED 1
74#define PPC_IN_USE 2
75
76static int acpi_processor_ppc_status;
77
78static int acpi_processor_ppc_notifier(struct notifier_block *nb,
79 unsigned long event, void *data)
80{
81 struct cpufreq_policy *policy = data;
82 struct acpi_processor *pr;
83 unsigned int ppc = 0;
84
85 if (event == CPUFREQ_START && ignore_ppc <= 0) {
86 ignore_ppc = 0;
87 return 0;
88 }
89
90 if (ignore_ppc)
91 return 0;
92
93 if (event != CPUFREQ_INCOMPATIBLE)
94 return 0;
95
96 mutex_lock(&performance_mutex);
97
98 pr = per_cpu(processors, policy->cpu);
99 if (!pr || !pr->performance)
100 goto out;
101
102 ppc = (unsigned int)pr->performance_platform_limit;
103
104 if (ppc >= pr->performance->state_count)
105 goto out;
106
107 cpufreq_verify_within_limits(policy, 0,
108 pr->performance->states[ppc].
109 core_frequency * 1000);
110
111 out:
112 mutex_unlock(&performance_mutex);
113
114 return 0;
115}
116
117static struct notifier_block acpi_ppc_notifier_block = {
118 .notifier_call = acpi_processor_ppc_notifier,
119};
120
121static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
122{
123 acpi_status status = 0;
124 unsigned long long ppc = 0;
125
126
127 if (!pr)
128 return -EINVAL;
129
130 /*
131 * _PPC indicates the maximum state currently supported by the platform
132 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
133 */
134 status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
135
136 if (status != AE_NOT_FOUND)
137 acpi_processor_ppc_status |= PPC_IN_USE;
138
139 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
140 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
141 return -ENODEV;
142 }
143
144 pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
145 (int)ppc, ppc ? "" : "not");
146
147 pr->performance_platform_limit = (int)ppc;
148
149 return 0;
150}
151
152#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
153/*
154 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
155 * @handle: ACPI processor handle
156 * @status: the status code of _PPC evaluation
157 * 0: success. OSPM is now using the performance state specificed.
158 * 1: failure. OSPM has not changed the number of P-states in use
159 */
160static void acpi_processor_ppc_ost(acpi_handle handle, int status)
161{
162 union acpi_object params[2] = {
163 {.type = ACPI_TYPE_INTEGER,},
164 {.type = ACPI_TYPE_INTEGER,},
165 };
166 struct acpi_object_list arg_list = {2, params};
167 acpi_handle temp;
168
169 params[0].integer.value = ACPI_PROCESSOR_NOTIFY_PERFORMANCE;
170 params[1].integer.value = status;
171
172 /* when there is no _OST , skip it */
173 if (ACPI_FAILURE(acpi_get_handle(handle, "_OST", &temp)))
174 return;
175
176 acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
177 return;
178}
179
180int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
181{
182 int ret;
183
184 if (ignore_ppc) {
185 /*
186 * Only when it is notification event, the _OST object
187 * will be evaluated. Otherwise it is skipped.
188 */
189 if (event_flag)
190 acpi_processor_ppc_ost(pr->handle, 1);
191 return 0;
192 }
193
194 ret = acpi_processor_get_platform_limit(pr);
195 /*
196 * Only when it is notification event, the _OST object
197 * will be evaluated. Otherwise it is skipped.
198 */
199 if (event_flag) {
200 if (ret < 0)
201 acpi_processor_ppc_ost(pr->handle, 1);
202 else
203 acpi_processor_ppc_ost(pr->handle, 0);
204 }
205 if (ret < 0)
206 return (ret);
207 else
208 return cpufreq_update_policy(pr->id);
209}
210
211int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
212{
213 struct acpi_processor *pr;
214
215 pr = per_cpu(processors, cpu);
216 if (!pr || !pr->performance || !pr->performance->state_count)
217 return -ENODEV;
218 *limit = pr->performance->states[pr->performance_platform_limit].
219 core_frequency * 1000;
220 return 0;
221}
222EXPORT_SYMBOL(acpi_processor_get_bios_limit);
223
224void acpi_processor_ppc_init(void)
225{
226 if (!cpufreq_register_notifier
227 (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
228 acpi_processor_ppc_status |= PPC_REGISTERED;
229 else
230 printk(KERN_DEBUG
231 "Warning: Processor Platform Limit not supported.\n");
232}
233
234void acpi_processor_ppc_exit(void)
235{
236 if (acpi_processor_ppc_status & PPC_REGISTERED)
237 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
238 CPUFREQ_POLICY_NOTIFIER);
239
240 acpi_processor_ppc_status &= ~PPC_REGISTERED;
241}
242
243static int acpi_processor_get_performance_control(struct acpi_processor *pr)
244{
245 int result = 0;
246 acpi_status status = 0;
247 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
248 union acpi_object *pct = NULL;
249 union acpi_object obj = { 0 };
250
251
252 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
253 if (ACPI_FAILURE(status)) {
254 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
255 return -ENODEV;
256 }
257
258 pct = (union acpi_object *)buffer.pointer;
259 if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
260 || (pct->package.count != 2)) {
261 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
262 result = -EFAULT;
263 goto end;
264 }
265
266 /*
267 * control_register
268 */
269
270 obj = pct->package.elements[0];
271
272 if ((obj.type != ACPI_TYPE_BUFFER)
273 || (obj.buffer.length < sizeof(struct acpi_pct_register))
274 || (obj.buffer.pointer == NULL)) {
275 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
276 result = -EFAULT;
277 goto end;
278 }
279 memcpy(&pr->performance->control_register, obj.buffer.pointer,
280 sizeof(struct acpi_pct_register));
281
282 /*
283 * status_register
284 */
285
286 obj = pct->package.elements[1];
287
288 if ((obj.type != ACPI_TYPE_BUFFER)
289 || (obj.buffer.length < sizeof(struct acpi_pct_register))
290 || (obj.buffer.pointer == NULL)) {
291 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
292 result = -EFAULT;
293 goto end;
294 }
295
296 memcpy(&pr->performance->status_register, obj.buffer.pointer,
297 sizeof(struct acpi_pct_register));
298
299 end:
300 kfree(buffer.pointer);
301
302 return result;
303}
304
305static int acpi_processor_get_performance_states(struct acpi_processor *pr)
306{
307 int result = 0;
308 acpi_status status = AE_OK;
309 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
310 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
311 struct acpi_buffer state = { 0, NULL };
312 union acpi_object *pss = NULL;
313 int i;
314
315
316 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
317 if (ACPI_FAILURE(status)) {
318 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
319 return -ENODEV;
320 }
321
322 pss = buffer.pointer;
323 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
324 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
325 result = -EFAULT;
326 goto end;
327 }
328
329 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
330 pss->package.count));
331
332 pr->performance->state_count = pss->package.count;
333 pr->performance->states =
334 kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
335 GFP_KERNEL);
336 if (!pr->performance->states) {
337 result = -ENOMEM;
338 goto end;
339 }
340
341 for (i = 0; i < pr->performance->state_count; i++) {
342
343 struct acpi_processor_px *px = &(pr->performance->states[i]);
344
345 state.length = sizeof(struct acpi_processor_px);
346 state.pointer = px;
347
348 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
349
350 status = acpi_extract_package(&(pss->package.elements[i]),
351 &format, &state);
352 if (ACPI_FAILURE(status)) {
353 ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
354 result = -EFAULT;
355 kfree(pr->performance->states);
356 goto end;
357 }
358
359 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
360 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
361 i,
362 (u32) px->core_frequency,
363 (u32) px->power,
364 (u32) px->transition_latency,
365 (u32) px->bus_master_latency,
366 (u32) px->control, (u32) px->status));
367
368 /*
369 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
370 */
371 if (!px->core_frequency ||
372 ((u32)(px->core_frequency * 1000) !=
373 (px->core_frequency * 1000))) {
374 printk(KERN_ERR FW_BUG PREFIX
375 "Invalid BIOS _PSS frequency: 0x%llx MHz\n",
376 px->core_frequency);
377 result = -EFAULT;
378 kfree(pr->performance->states);
379 goto end;
380 }
381 }
382
383 end:
384 kfree(buffer.pointer);
385
386 return result;
387}
388
389static int acpi_processor_get_performance_info(struct acpi_processor *pr)
390{
391 int result = 0;
392 acpi_status status = AE_OK;
393 acpi_handle handle = NULL;
394
395 if (!pr || !pr->performance || !pr->handle)
396 return -EINVAL;
397
398 status = acpi_get_handle(pr->handle, "_PCT", &handle);
399 if (ACPI_FAILURE(status)) {
400 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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 /* We need to call _PPC once when cpufreq starts */
414 if (ignore_ppc != 1)
415 result = acpi_processor_get_platform_limit(pr);
416
417 return result;
418
419 /*
420 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
421 * the BIOS is older than the CPU and does not know its frequencies
422 */
423 update_bios:
424#ifdef CONFIG_X86
425 if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){
426 if(boot_cpu_has(X86_FEATURE_EST))
427 printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
428 "frequency support\n");
429 }
430#endif
431 return result;
432}
433
434int acpi_processor_notify_smm(struct module *calling_module)
435{
436 acpi_status status;
437 static int is_done = 0;
438
439
440 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
441 return -EBUSY;
442
443 if (!try_module_get(calling_module))
444 return -EINVAL;
445
446 /* is_done is set to negative if an error occurred,
447 * and to postitive if _no_ error occurred, but SMM
448 * was already notified. This avoids double notification
449 * which might lead to unexpected results...
450 */
451 if (is_done > 0) {
452 module_put(calling_module);
453 return 0;
454 } else if (is_done < 0) {
455 module_put(calling_module);
456 return is_done;
457 }
458
459 is_done = -EIO;
460
461 /* Can't write pstate_control to smi_command if either value is zero */
462 if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
463 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
464 module_put(calling_module);
465 return 0;
466 }
467
468 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
469 "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(acpi_gbl_FADT.smi_command,
473 (u32) acpi_gbl_FADT.pstate_control, 8);
474 if (ACPI_FAILURE(status)) {
475 ACPI_EXCEPTION((AE_INFO, status,
476 "Failed to write pstate_control [0x%x] to "
477 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
478 acpi_gbl_FADT.smi_command));
479 module_put(calling_module);
480 return status;
481 }
482
483 /* Success. If there's no _PPC, we need to fear nothing, so
484 * we can allow the cpufreq driver to be rmmod'ed. */
485 is_done = 1;
486
487 if (!(acpi_processor_ppc_status & PPC_IN_USE))
488 module_put(calling_module);
489
490 return 0;
491}
492
493EXPORT_SYMBOL(acpi_processor_notify_smm);
494
495static int acpi_processor_get_psd(struct acpi_processor *pr)
496{
497 int result = 0;
498 acpi_status status = AE_OK;
499 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
500 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
501 struct acpi_buffer state = {0, NULL};
502 union acpi_object *psd = NULL;
503 struct acpi_psd_package *pdomain;
504
505 status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
506 if (ACPI_FAILURE(status)) {
507 return -ENODEV;
508 }
509
510 psd = buffer.pointer;
511 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
512 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
513 result = -EFAULT;
514 goto end;
515 }
516
517 if (psd->package.count != 1) {
518 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
519 result = -EFAULT;
520 goto end;
521 }
522
523 pdomain = &(pr->performance->domain_info);
524
525 state.length = sizeof(struct acpi_psd_package);
526 state.pointer = pdomain;
527
528 status = acpi_extract_package(&(psd->package.elements[0]),
529 &format, &state);
530 if (ACPI_FAILURE(status)) {
531 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
532 result = -EFAULT;
533 goto end;
534 }
535
536 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
537 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
538 result = -EFAULT;
539 goto end;
540 }
541
542 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
543 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
544 result = -EFAULT;
545 goto end;
546 }
547
548 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
549 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
550 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
551 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
552 result = -EFAULT;
553 goto end;
554 }
555end:
556 kfree(buffer.pointer);
557 return result;
558}
559
560int acpi_processor_preregister_performance(
561 struct acpi_processor_performance __percpu *performance)
562{
563 int count, count_target;
564 int retval = 0;
565 unsigned int i, j;
566 cpumask_var_t covered_cpus;
567 struct acpi_processor *pr;
568 struct acpi_psd_package *pdomain;
569 struct acpi_processor *match_pr;
570 struct acpi_psd_package *match_pdomain;
571
572 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
573 return -ENOMEM;
574
575 mutex_lock(&performance_mutex);
576
577 /*
578 * Check if another driver has already registered, and abort before
579 * changing pr->performance if it has. Check input data as well.
580 */
581 for_each_possible_cpu(i) {
582 pr = per_cpu(processors, i);
583 if (!pr) {
584 /* Look only at processors in ACPI namespace */
585 continue;
586 }
587
588 if (pr->performance) {
589 retval = -EBUSY;
590 goto err_out;
591 }
592
593 if (!performance || !per_cpu_ptr(performance, i)) {
594 retval = -EINVAL;
595 goto err_out;
596 }
597 }
598
599 /* Call _PSD for all CPUs */
600 for_each_possible_cpu(i) {
601 pr = per_cpu(processors, i);
602 if (!pr)
603 continue;
604
605 pr->performance = per_cpu_ptr(performance, i);
606 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
607 if (acpi_processor_get_psd(pr)) {
608 retval = -EINVAL;
609 continue;
610 }
611 }
612 if (retval)
613 goto err_ret;
614
615 /*
616 * Now that we have _PSD data from all CPUs, lets setup P-state
617 * domain info.
618 */
619 for_each_possible_cpu(i) {
620 pr = per_cpu(processors, i);
621 if (!pr)
622 continue;
623
624 if (cpumask_test_cpu(i, covered_cpus))
625 continue;
626
627 pdomain = &(pr->performance->domain_info);
628 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
629 cpumask_set_cpu(i, covered_cpus);
630 if (pdomain->num_processors <= 1)
631 continue;
632
633 /* Validate the Domain info */
634 count_target = pdomain->num_processors;
635 count = 1;
636 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
637 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
638 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
639 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
640 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
641 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
642
643 for_each_possible_cpu(j) {
644 if (i == j)
645 continue;
646
647 match_pr = per_cpu(processors, j);
648 if (!match_pr)
649 continue;
650
651 match_pdomain = &(match_pr->performance->domain_info);
652 if (match_pdomain->domain != pdomain->domain)
653 continue;
654
655 /* Here i and j are in the same domain */
656
657 if (match_pdomain->num_processors != count_target) {
658 retval = -EINVAL;
659 goto err_ret;
660 }
661
662 if (pdomain->coord_type != match_pdomain->coord_type) {
663 retval = -EINVAL;
664 goto err_ret;
665 }
666
667 cpumask_set_cpu(j, covered_cpus);
668 cpumask_set_cpu(j, pr->performance->shared_cpu_map);
669 count++;
670 }
671
672 for_each_possible_cpu(j) {
673 if (i == j)
674 continue;
675
676 match_pr = per_cpu(processors, j);
677 if (!match_pr)
678 continue;
679
680 match_pdomain = &(match_pr->performance->domain_info);
681 if (match_pdomain->domain != pdomain->domain)
682 continue;
683
684 match_pr->performance->shared_type =
685 pr->performance->shared_type;
686 cpumask_copy(match_pr->performance->shared_cpu_map,
687 pr->performance->shared_cpu_map);
688 }
689 }
690
691err_ret:
692 for_each_possible_cpu(i) {
693 pr = per_cpu(processors, i);
694 if (!pr || !pr->performance)
695 continue;
696
697 /* Assume no coordination on any error parsing domain info */
698 if (retval) {
699 cpumask_clear(pr->performance->shared_cpu_map);
700 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
701 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
702 }
703 pr->performance = NULL; /* Will be set for real in register */
704 }
705
706err_out:
707 mutex_unlock(&performance_mutex);
708 free_cpumask_var(covered_cpus);
709 return retval;
710}
711EXPORT_SYMBOL(acpi_processor_preregister_performance);
712
713int
714acpi_processor_register_performance(struct acpi_processor_performance
715 *performance, unsigned int cpu)
716{
717 struct acpi_processor *pr;
718
719 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
720 return -EINVAL;
721
722 mutex_lock(&performance_mutex);
723
724 pr = per_cpu(processors, cpu);
725 if (!pr) {
726 mutex_unlock(&performance_mutex);
727 return -ENODEV;
728 }
729
730 if (pr->performance) {
731 mutex_unlock(&performance_mutex);
732 return -EBUSY;
733 }
734
735 WARN_ON(!performance);
736
737 pr->performance = performance;
738
739 if (acpi_processor_get_performance_info(pr)) {
740 pr->performance = NULL;
741 mutex_unlock(&performance_mutex);
742 return -EIO;
743 }
744
745 mutex_unlock(&performance_mutex);
746 return 0;
747}
748
749EXPORT_SYMBOL(acpi_processor_register_performance);
750
751void
752acpi_processor_unregister_performance(struct acpi_processor_performance
753 *performance, unsigned int cpu)
754{
755 struct acpi_processor *pr;
756
757 mutex_lock(&performance_mutex);
758
759 pr = per_cpu(processors, cpu);
760 if (!pr) {
761 mutex_unlock(&performance_mutex);
762 return;
763 }
764
765 if (pr->performance)
766 kfree(pr->performance->states);
767 pr->performance = NULL;
768
769 mutex_unlock(&performance_mutex);
770
771 return;
772}
773
774EXPORT_SYMBOL(acpi_processor_unregister_performance);
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
27static DEFINE_MUTEX(performance_mutex);
28
29/*
30 * _PPC support is implemented as a CPUfreq policy notifier:
31 * This means each time a CPUfreq driver registered also with
32 * the ACPI core is asked to change the speed policy, the maximum
33 * value is adjusted so that it is within the platform limit.
34 *
35 * Also, when a new platform limit value is detected, the CPUfreq
36 * policy is adjusted accordingly.
37 */
38
39/* ignore_ppc:
40 * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
41 * ignore _PPC
42 * 0 -> cpufreq low level drivers initialized -> consider _PPC values
43 * 1 -> ignore _PPC totally -> forced by user through boot param
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 * _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 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 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
97 * @handle: ACPI processor handle
98 * @status: the status code of _PPC evaluation
99 * 0: success. OSPM is now using the performance state specified.
100 * 1: failure. OSPM has not changed the number of P-states in use
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 * Only when it is notification event, the _OST object
116 * will be evaluated. Otherwise it is skipped.
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 * Only when it is notification event, the _OST object
126 * will be evaluated. Otherwise it is skipped.
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
146 *limit = pr->performance->states[pr->performance_platform_limit].
147 core_frequency * 1000;
148 return 0;
149}
150EXPORT_SYMBOL(acpi_processor_get_bios_limit);
151
152void acpi_processor_ignore_ppc_init(void)
153{
154 if (ignore_ppc < 0)
155 ignore_ppc = 0;
156}
157
158void acpi_processor_ppc_init(struct cpufreq_policy *policy)
159{
160 unsigned int cpu;
161
162 for_each_cpu(cpu, policy->related_cpus) {
163 struct acpi_processor *pr = per_cpu(processors, cpu);
164 int ret;
165
166 if (!pr)
167 continue;
168
169 ret = freq_qos_add_request(&policy->constraints,
170 &pr->perflib_req,
171 FREQ_QOS_MAX, INT_MAX);
172 if (ret < 0)
173 pr_err("Failed to add freq constraint for CPU%d (%d)\n",
174 cpu, ret);
175 }
176}
177
178void acpi_processor_ppc_exit(struct cpufreq_policy *policy)
179{
180 unsigned int cpu;
181
182 for_each_cpu(cpu, policy->related_cpus) {
183 struct acpi_processor *pr = per_cpu(processors, cpu);
184
185 if (pr)
186 freq_qos_remove_request(&pr->perflib_req);
187 }
188}
189
190static int acpi_processor_get_performance_control(struct acpi_processor *pr)
191{
192 int result = 0;
193 acpi_status status = 0;
194 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
195 union acpi_object *pct = NULL;
196 union acpi_object obj = { 0 };
197
198 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
199 if (ACPI_FAILURE(status)) {
200 acpi_evaluation_failure_warn(pr->handle, "_PCT", status);
201 return -ENODEV;
202 }
203
204 pct = (union acpi_object *)buffer.pointer;
205 if (!pct || pct->type != ACPI_TYPE_PACKAGE || pct->package.count != 2) {
206 pr_err("Invalid _PCT data\n");
207 result = -EFAULT;
208 goto end;
209 }
210
211 /*
212 * control_register
213 */
214
215 obj = pct->package.elements[0];
216
217 if (!obj.buffer.pointer || obj.type != ACPI_TYPE_BUFFER ||
218 obj.buffer.length < sizeof(struct acpi_pct_register)) {
219 pr_err("Invalid _PCT data (control_register)\n");
220 result = -EFAULT;
221 goto end;
222 }
223 memcpy(&pr->performance->control_register, obj.buffer.pointer,
224 sizeof(struct acpi_pct_register));
225
226 /*
227 * status_register
228 */
229
230 obj = pct->package.elements[1];
231
232 if (!obj.buffer.pointer || obj.type != ACPI_TYPE_BUFFER ||
233 obj.buffer.length < sizeof(struct acpi_pct_register)) {
234 pr_err("Invalid _PCT data (status_register)\n");
235 result = -EFAULT;
236 goto end;
237 }
238
239 memcpy(&pr->performance->status_register, obj.buffer.pointer,
240 sizeof(struct acpi_pct_register));
241
242end:
243 kfree(buffer.pointer);
244
245 return result;
246}
247
248#ifdef CONFIG_X86
249/*
250 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
251 * in their ACPI data. Calculate the real values and fix up the _PSS data.
252 */
253static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
254{
255 u32 hi, lo, fid, did;
256 int index = px->control & 0x00000007;
257
258 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
259 return;
260
261 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) ||
262 boot_cpu_data.x86 == 0x11) {
263 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
264 /*
265 * MSR C001_0064+:
266 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
267 */
268 if (!(hi & BIT(31)))
269 return;
270
271 fid = lo & 0x3f;
272 did = (lo >> 6) & 7;
273 if (boot_cpu_data.x86 == 0x10)
274 px->core_frequency = (100 * (fid + 0x10)) >> did;
275 else
276 px->core_frequency = (100 * (fid + 8)) >> did;
277 }
278}
279#else
280static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
281#endif
282
283static int acpi_processor_get_performance_states(struct acpi_processor *pr)
284{
285 int result = 0;
286 acpi_status status = AE_OK;
287 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
288 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
289 struct acpi_buffer state = { 0, NULL };
290 union acpi_object *pss = NULL;
291 int i;
292 int last_invalid = -1;
293
294 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
295 if (ACPI_FAILURE(status)) {
296 acpi_evaluation_failure_warn(pr->handle, "_PSS", status);
297 return -ENODEV;
298 }
299
300 pss = buffer.pointer;
301 if (!pss || pss->type != ACPI_TYPE_PACKAGE) {
302 pr_err("Invalid _PSS data\n");
303 result = -EFAULT;
304 goto end;
305 }
306
307 acpi_handle_debug(pr->handle, "Found %d performance states\n",
308 pss->package.count);
309
310 pr->performance->state_count = pss->package.count;
311 pr->performance->states =
312 kmalloc_array(pss->package.count,
313 sizeof(struct acpi_processor_px),
314 GFP_KERNEL);
315 if (!pr->performance->states) {
316 result = -ENOMEM;
317 goto end;
318 }
319
320 for (i = 0; i < pr->performance->state_count; i++) {
321
322 struct acpi_processor_px *px = &(pr->performance->states[i]);
323
324 state.length = sizeof(struct acpi_processor_px);
325 state.pointer = px;
326
327 acpi_handle_debug(pr->handle, "Extracting state %d\n", i);
328
329 status = acpi_extract_package(&(pss->package.elements[i]),
330 &format, &state);
331 if (ACPI_FAILURE(status)) {
332 acpi_handle_warn(pr->handle, "Invalid _PSS data: %s\n",
333 acpi_format_exception(status));
334 result = -EFAULT;
335 kfree(pr->performance->states);
336 goto end;
337 }
338
339 amd_fixup_frequency(px, i);
340
341 acpi_handle_debug(pr->handle,
342 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
343 i,
344 (u32) px->core_frequency,
345 (u32) px->power,
346 (u32) px->transition_latency,
347 (u32) px->bus_master_latency,
348 (u32) px->control, (u32) px->status);
349
350 /*
351 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
352 */
353 if (!px->core_frequency ||
354 (u32)(px->core_frequency * 1000) != px->core_frequency * 1000) {
355 pr_err(FW_BUG
356 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
357 pr->id, px->core_frequency);
358 if (last_invalid == -1)
359 last_invalid = i;
360 } else {
361 if (last_invalid != -1) {
362 /*
363 * Copy this valid entry over last_invalid entry
364 */
365 memcpy(&(pr->performance->states[last_invalid]),
366 px, sizeof(struct acpi_processor_px));
367 ++last_invalid;
368 }
369 }
370 }
371
372 if (last_invalid == 0) {
373 pr_err(FW_BUG
374 "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
375 result = -EFAULT;
376 kfree(pr->performance->states);
377 pr->performance->states = NULL;
378 }
379
380 if (last_invalid > 0)
381 pr->performance->state_count = last_invalid;
382
383end:
384 kfree(buffer.pointer);
385
386 return result;
387}
388
389int acpi_processor_get_performance_info(struct acpi_processor *pr)
390{
391 int result = 0;
392
393 if (!pr || !pr->performance || !pr->handle)
394 return -EINVAL;
395
396 if (!acpi_has_method(pr->handle, "_PCT")) {
397 acpi_handle_debug(pr->handle,
398 "ACPI-based processor performance control unavailable\n");
399 return -ENODEV;
400 }
401
402 result = acpi_processor_get_performance_control(pr);
403 if (result)
404 goto update_bios;
405
406 result = acpi_processor_get_performance_states(pr);
407 if (result)
408 goto update_bios;
409
410 /* We need to call _PPC once when cpufreq starts */
411 if (ignore_ppc != 1)
412 result = acpi_processor_get_platform_limit(pr);
413
414 return result;
415
416 /*
417 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
418 * the BIOS is older than the CPU and does not know its frequencies
419 */
420 update_bios:
421#ifdef CONFIG_X86
422 if (acpi_has_method(pr->handle, "_PPC")) {
423 if(boot_cpu_has(X86_FEATURE_EST))
424 pr_warn(FW_BUG "BIOS needs update for CPU "
425 "frequency support\n");
426 }
427#endif
428 return result;
429}
430EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
431
432int acpi_processor_pstate_control(void)
433{
434 acpi_status status;
435
436 if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
437 return 0;
438
439 pr_debug("Writing pstate_control [0x%x] to smi_command [0x%x]\n",
440 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command);
441
442 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
443 (u32)acpi_gbl_FADT.pstate_control, 8);
444 if (ACPI_SUCCESS(status))
445 return 1;
446
447 pr_warn("Failed to write pstate_control [0x%x] to smi_command [0x%x]: %s\n",
448 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command,
449 acpi_format_exception(status));
450 return -EIO;
451}
452
453int acpi_processor_notify_smm(struct module *calling_module)
454{
455 static int is_done;
456 int result = 0;
457
458 if (!acpi_processor_cpufreq_init)
459 return -EBUSY;
460
461 if (!try_module_get(calling_module))
462 return -EINVAL;
463
464 /*
465 * is_done is set to negative if an error occurs and to 1 if no error
466 * occurrs, but SMM has been notified already. This avoids repeated
467 * notification which might lead to unexpected results.
468 */
469 if (is_done != 0) {
470 if (is_done < 0)
471 result = is_done;
472
473 goto out_put;
474 }
475
476 result = acpi_processor_pstate_control();
477 if (result <= 0) {
478 if (result) {
479 is_done = result;
480 } else {
481 pr_debug("No SMI port or pstate_control\n");
482 is_done = 1;
483 }
484 goto out_put;
485 }
486
487 is_done = 1;
488 /*
489 * Success. If there _PPC, unloading the cpufreq driver would be risky,
490 * so disallow it in that case.
491 */
492 if (acpi_processor_ppc_in_use)
493 return 0;
494
495out_put:
496 module_put(calling_module);
497 return result;
498}
499EXPORT_SYMBOL(acpi_processor_notify_smm);
500
501int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)
502{
503 int result = 0;
504 acpi_status status = AE_OK;
505 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
506 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
507 struct acpi_buffer state = {0, NULL};
508 union acpi_object *psd = NULL;
509
510 status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer);
511 if (ACPI_FAILURE(status)) {
512 return -ENODEV;
513 }
514
515 psd = buffer.pointer;
516 if (!psd || psd->type != ACPI_TYPE_PACKAGE) {
517 pr_err("Invalid _PSD data\n");
518 result = -EFAULT;
519 goto end;
520 }
521
522 if (psd->package.count != 1) {
523 pr_err("Invalid _PSD data\n");
524 result = -EFAULT;
525 goto end;
526 }
527
528 state.length = sizeof(struct acpi_psd_package);
529 state.pointer = pdomain;
530
531 status = acpi_extract_package(&(psd->package.elements[0]), &format, &state);
532 if (ACPI_FAILURE(status)) {
533 pr_err("Invalid _PSD data\n");
534 result = -EFAULT;
535 goto end;
536 }
537
538 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
539 pr_err("Unknown _PSD:num_entries\n");
540 result = -EFAULT;
541 goto end;
542 }
543
544 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
545 pr_err("Unknown _PSD:revision\n");
546 result = -EFAULT;
547 goto end;
548 }
549
550 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
551 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
552 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
553 pr_err("Invalid _PSD:coord_type\n");
554 result = -EFAULT;
555 goto end;
556 }
557end:
558 kfree(buffer.pointer);
559 return result;
560}
561EXPORT_SYMBOL(acpi_processor_get_psd);
562
563int acpi_processor_preregister_performance(
564 struct acpi_processor_performance __percpu *performance)
565{
566 int count_target;
567 int retval = 0;
568 unsigned int i, j;
569 cpumask_var_t covered_cpus;
570 struct acpi_processor *pr;
571 struct acpi_psd_package *pdomain;
572 struct acpi_processor *match_pr;
573 struct acpi_psd_package *match_pdomain;
574
575 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
576 return -ENOMEM;
577
578 mutex_lock(&performance_mutex);
579
580 /*
581 * Check if another driver has already registered, and abort before
582 * changing pr->performance if it has. Check input data as well.
583 */
584 for_each_possible_cpu(i) {
585 pr = per_cpu(processors, i);
586 if (!pr) {
587 /* Look only at processors in ACPI namespace */
588 continue;
589 }
590
591 if (pr->performance) {
592 retval = -EBUSY;
593 goto err_out;
594 }
595
596 if (!performance || !per_cpu_ptr(performance, i)) {
597 retval = -EINVAL;
598 goto err_out;
599 }
600 }
601
602 /* Call _PSD for all CPUs */
603 for_each_possible_cpu(i) {
604 pr = per_cpu(processors, i);
605 if (!pr)
606 continue;
607
608 pr->performance = per_cpu_ptr(performance, i);
609 pdomain = &(pr->performance->domain_info);
610 if (acpi_processor_get_psd(pr->handle, pdomain)) {
611 retval = -EINVAL;
612 continue;
613 }
614 }
615 if (retval)
616 goto err_ret;
617
618 /*
619 * Now that we have _PSD data from all CPUs, lets setup P-state
620 * domain info.
621 */
622 for_each_possible_cpu(i) {
623 pr = per_cpu(processors, i);
624 if (!pr)
625 continue;
626
627 if (cpumask_test_cpu(i, covered_cpus))
628 continue;
629
630 pdomain = &(pr->performance->domain_info);
631 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
632 cpumask_set_cpu(i, covered_cpus);
633 if (pdomain->num_processors <= 1)
634 continue;
635
636 /* Validate the Domain info */
637 count_target = pdomain->num_processors;
638 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
639 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
640 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
641 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
642 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
643 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
644
645 for_each_possible_cpu(j) {
646 if (i == j)
647 continue;
648
649 match_pr = per_cpu(processors, j);
650 if (!match_pr)
651 continue;
652
653 match_pdomain = &(match_pr->performance->domain_info);
654 if (match_pdomain->domain != pdomain->domain)
655 continue;
656
657 /* Here i and j are in the same domain */
658
659 if (match_pdomain->num_processors != count_target) {
660 retval = -EINVAL;
661 goto err_ret;
662 }
663
664 if (pdomain->coord_type != match_pdomain->coord_type) {
665 retval = -EINVAL;
666 goto err_ret;
667 }
668
669 cpumask_set_cpu(j, covered_cpus);
670 cpumask_set_cpu(j, pr->performance->shared_cpu_map);
671 }
672
673 for_each_possible_cpu(j) {
674 if (i == j)
675 continue;
676
677 match_pr = per_cpu(processors, j);
678 if (!match_pr)
679 continue;
680
681 match_pdomain = &(match_pr->performance->domain_info);
682 if (match_pdomain->domain != pdomain->domain)
683 continue;
684
685 match_pr->performance->shared_type =
686 pr->performance->shared_type;
687 cpumask_copy(match_pr->performance->shared_cpu_map,
688 pr->performance->shared_cpu_map);
689 }
690 }
691
692err_ret:
693 for_each_possible_cpu(i) {
694 pr = per_cpu(processors, i);
695 if (!pr || !pr->performance)
696 continue;
697
698 /* Assume no coordination on any error parsing domain info */
699 if (retval) {
700 cpumask_clear(pr->performance->shared_cpu_map);
701 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
702 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_NONE;
703 }
704 pr->performance = NULL; /* Will be set for real in register */
705 }
706
707err_out:
708 mutex_unlock(&performance_mutex);
709 free_cpumask_var(covered_cpus);
710 return retval;
711}
712EXPORT_SYMBOL(acpi_processor_preregister_performance);
713
714int acpi_processor_register_performance(struct acpi_processor_performance
715 *performance, unsigned int cpu)
716{
717 struct acpi_processor *pr;
718
719 if (!acpi_processor_cpufreq_init)
720 return -EINVAL;
721
722 mutex_lock(&performance_mutex);
723
724 pr = per_cpu(processors, cpu);
725 if (!pr) {
726 mutex_unlock(&performance_mutex);
727 return -ENODEV;
728 }
729
730 if (pr->performance) {
731 mutex_unlock(&performance_mutex);
732 return -EBUSY;
733 }
734
735 WARN_ON(!performance);
736
737 pr->performance = performance;
738
739 if (acpi_processor_get_performance_info(pr)) {
740 pr->performance = NULL;
741 mutex_unlock(&performance_mutex);
742 return -EIO;
743 }
744
745 mutex_unlock(&performance_mutex);
746 return 0;
747}
748EXPORT_SYMBOL(acpi_processor_register_performance);
749
750void acpi_processor_unregister_performance(unsigned int cpu)
751{
752 struct acpi_processor *pr;
753
754 mutex_lock(&performance_mutex);
755
756 pr = per_cpu(processors, cpu);
757 if (!pr)
758 goto unlock;
759
760 if (pr->performance)
761 kfree(pr->performance->states);
762
763 pr->performance = NULL;
764
765unlock:
766 mutex_unlock(&performance_mutex);
767}
768EXPORT_SYMBOL(acpi_processor_unregister_performance);