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 */
24
25#include <linux/kernel.h>
26#include <linux/module.h>
27#include <linux/init.h>
28#include <linux/cpufreq.h>
29#include <linux/slab.h>
30#include <linux/acpi.h>
31#include <acpi/processor.h>
32#ifdef CONFIG_X86
33#include <asm/cpufeature.h>
34#endif
35
36#define PREFIX "ACPI: "
37
38#define ACPI_PROCESSOR_CLASS "processor"
39#define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
40#define _COMPONENT ACPI_PROCESSOR_COMPONENT
41ACPI_MODULE_NAME("processor_perflib");
42
43static DEFINE_MUTEX(performance_mutex);
44
45/*
46 * _PPC support is implemented as a CPUfreq policy notifier:
47 * This means each time a CPUfreq driver registered also with
48 * the ACPI core is asked to change the speed policy, the maximum
49 * value is adjusted so that it is within the platform limit.
50 *
51 * Also, when a new platform limit value is detected, the CPUfreq
52 * policy is adjusted accordingly.
53 */
54
55/* ignore_ppc:
56 * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
57 * ignore _PPC
58 * 0 -> cpufreq low level drivers initialized -> consider _PPC values
59 * 1 -> ignore _PPC totally -> forced by user through boot param
60 */
61static int ignore_ppc = -1;
62module_param(ignore_ppc, int, 0644);
63MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
64 "limited by BIOS, this should help");
65
66#define PPC_REGISTERED 1
67#define PPC_IN_USE 2
68
69static int acpi_processor_ppc_status;
70
71static int acpi_processor_ppc_notifier(struct notifier_block *nb,
72 unsigned long event, void *data)
73{
74 struct cpufreq_policy *policy = data;
75 struct acpi_processor *pr;
76 unsigned int ppc = 0;
77
78 if (ignore_ppc < 0)
79 ignore_ppc = 0;
80
81 if (ignore_ppc)
82 return 0;
83
84 if (event != CPUFREQ_ADJUST)
85 return 0;
86
87 mutex_lock(&performance_mutex);
88
89 pr = per_cpu(processors, policy->cpu);
90 if (!pr || !pr->performance)
91 goto out;
92
93 ppc = (unsigned int)pr->performance_platform_limit;
94
95 if (ppc >= pr->performance->state_count)
96 goto out;
97
98 cpufreq_verify_within_limits(policy, 0,
99 pr->performance->states[ppc].
100 core_frequency * 1000);
101
102 out:
103 mutex_unlock(&performance_mutex);
104
105 return 0;
106}
107
108static struct notifier_block acpi_ppc_notifier_block = {
109 .notifier_call = acpi_processor_ppc_notifier,
110};
111
112static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
113{
114 acpi_status status = 0;
115 unsigned long long ppc = 0;
116
117
118 if (!pr)
119 return -EINVAL;
120
121 /*
122 * _PPC indicates the maximum state currently supported by the platform
123 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
124 */
125 status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
126
127 if (status != AE_NOT_FOUND)
128 acpi_processor_ppc_status |= PPC_IN_USE;
129
130 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
131 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
132 return -ENODEV;
133 }
134
135 pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
136 (int)ppc, ppc ? "" : "not");
137
138 pr->performance_platform_limit = (int)ppc;
139
140 return 0;
141}
142
143#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
144/*
145 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
146 * @handle: ACPI processor handle
147 * @status: the status code of _PPC evaluation
148 * 0: success. OSPM is now using the performance state specificed.
149 * 1: failure. OSPM has not changed the number of P-states in use
150 */
151static void acpi_processor_ppc_ost(acpi_handle handle, int status)
152{
153 if (acpi_has_method(handle, "_OST"))
154 acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
155 status, NULL);
156}
157
158void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
159{
160 int ret;
161
162 if (ignore_ppc || !pr->performance) {
163 /*
164 * Only when it is notification event, the _OST object
165 * will be evaluated. Otherwise it is skipped.
166 */
167 if (event_flag)
168 acpi_processor_ppc_ost(pr->handle, 1);
169 return;
170 }
171
172 ret = acpi_processor_get_platform_limit(pr);
173 /*
174 * Only when it is notification event, the _OST object
175 * will be evaluated. Otherwise it is skipped.
176 */
177 if (event_flag) {
178 if (ret < 0)
179 acpi_processor_ppc_ost(pr->handle, 1);
180 else
181 acpi_processor_ppc_ost(pr->handle, 0);
182 }
183 if (ret >= 0)
184 cpufreq_update_policy(pr->id);
185}
186
187int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
188{
189 struct acpi_processor *pr;
190
191 pr = per_cpu(processors, cpu);
192 if (!pr || !pr->performance || !pr->performance->state_count)
193 return -ENODEV;
194 *limit = pr->performance->states[pr->performance_platform_limit].
195 core_frequency * 1000;
196 return 0;
197}
198EXPORT_SYMBOL(acpi_processor_get_bios_limit);
199
200void acpi_processor_ppc_init(void)
201{
202 if (!cpufreq_register_notifier
203 (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
204 acpi_processor_ppc_status |= PPC_REGISTERED;
205 else
206 printk(KERN_DEBUG
207 "Warning: Processor Platform Limit not supported.\n");
208}
209
210void acpi_processor_ppc_exit(void)
211{
212 if (acpi_processor_ppc_status & PPC_REGISTERED)
213 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
214 CPUFREQ_POLICY_NOTIFIER);
215
216 acpi_processor_ppc_status &= ~PPC_REGISTERED;
217}
218
219static int acpi_processor_get_performance_control(struct acpi_processor *pr)
220{
221 int result = 0;
222 acpi_status status = 0;
223 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
224 union acpi_object *pct = NULL;
225 union acpi_object obj = { 0 };
226
227
228 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
229 if (ACPI_FAILURE(status)) {
230 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
231 return -ENODEV;
232 }
233
234 pct = (union acpi_object *)buffer.pointer;
235 if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
236 || (pct->package.count != 2)) {
237 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
238 result = -EFAULT;
239 goto end;
240 }
241
242 /*
243 * control_register
244 */
245
246 obj = pct->package.elements[0];
247
248 if ((obj.type != ACPI_TYPE_BUFFER)
249 || (obj.buffer.length < sizeof(struct acpi_pct_register))
250 || (obj.buffer.pointer == NULL)) {
251 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
252 result = -EFAULT;
253 goto end;
254 }
255 memcpy(&pr->performance->control_register, obj.buffer.pointer,
256 sizeof(struct acpi_pct_register));
257
258 /*
259 * status_register
260 */
261
262 obj = pct->package.elements[1];
263
264 if ((obj.type != ACPI_TYPE_BUFFER)
265 || (obj.buffer.length < sizeof(struct acpi_pct_register))
266 || (obj.buffer.pointer == NULL)) {
267 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
268 result = -EFAULT;
269 goto end;
270 }
271
272 memcpy(&pr->performance->status_register, obj.buffer.pointer,
273 sizeof(struct acpi_pct_register));
274
275 end:
276 kfree(buffer.pointer);
277
278 return result;
279}
280
281#ifdef CONFIG_X86
282/*
283 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
284 * in their ACPI data. Calculate the real values and fix up the _PSS data.
285 */
286static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
287{
288 u32 hi, lo, fid, did;
289 int index = px->control & 0x00000007;
290
291 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
292 return;
293
294 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
295 || boot_cpu_data.x86 == 0x11) {
296 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
297 /*
298 * MSR C001_0064+:
299 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
300 */
301 if (!(hi & BIT(31)))
302 return;
303
304 fid = lo & 0x3f;
305 did = (lo >> 6) & 7;
306 if (boot_cpu_data.x86 == 0x10)
307 px->core_frequency = (100 * (fid + 0x10)) >> did;
308 else
309 px->core_frequency = (100 * (fid + 8)) >> did;
310 }
311}
312#else
313static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
314#endif
315
316static int acpi_processor_get_performance_states(struct acpi_processor *pr)
317{
318 int result = 0;
319 acpi_status status = AE_OK;
320 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
321 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
322 struct acpi_buffer state = { 0, NULL };
323 union acpi_object *pss = NULL;
324 int i;
325 int last_invalid = -1;
326
327
328 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
329 if (ACPI_FAILURE(status)) {
330 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
331 return -ENODEV;
332 }
333
334 pss = buffer.pointer;
335 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
336 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
337 result = -EFAULT;
338 goto end;
339 }
340
341 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
342 pss->package.count));
343
344 pr->performance->state_count = pss->package.count;
345 pr->performance->states =
346 kmalloc_array(pss->package.count,
347 sizeof(struct acpi_processor_px),
348 GFP_KERNEL);
349 if (!pr->performance->states) {
350 result = -ENOMEM;
351 goto end;
352 }
353
354 for (i = 0; i < pr->performance->state_count; i++) {
355
356 struct acpi_processor_px *px = &(pr->performance->states[i]);
357
358 state.length = sizeof(struct acpi_processor_px);
359 state.pointer = px;
360
361 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
362
363 status = acpi_extract_package(&(pss->package.elements[i]),
364 &format, &state);
365 if (ACPI_FAILURE(status)) {
366 ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
367 result = -EFAULT;
368 kfree(pr->performance->states);
369 goto end;
370 }
371
372 amd_fixup_frequency(px, i);
373
374 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
375 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
376 i,
377 (u32) px->core_frequency,
378 (u32) px->power,
379 (u32) px->transition_latency,
380 (u32) px->bus_master_latency,
381 (u32) px->control, (u32) px->status));
382
383 /*
384 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
385 */
386 if (!px->core_frequency ||
387 ((u32)(px->core_frequency * 1000) !=
388 (px->core_frequency * 1000))) {
389 printk(KERN_ERR FW_BUG PREFIX
390 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
391 pr->id, px->core_frequency);
392 if (last_invalid == -1)
393 last_invalid = i;
394 } else {
395 if (last_invalid != -1) {
396 /*
397 * Copy this valid entry over last_invalid entry
398 */
399 memcpy(&(pr->performance->states[last_invalid]),
400 px, sizeof(struct acpi_processor_px));
401 ++last_invalid;
402 }
403 }
404 }
405
406 if (last_invalid == 0) {
407 printk(KERN_ERR FW_BUG PREFIX
408 "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
409 result = -EFAULT;
410 kfree(pr->performance->states);
411 pr->performance->states = NULL;
412 }
413
414 if (last_invalid > 0)
415 pr->performance->state_count = last_invalid;
416
417 end:
418 kfree(buffer.pointer);
419
420 return result;
421}
422
423int acpi_processor_get_performance_info(struct acpi_processor *pr)
424{
425 int result = 0;
426
427 if (!pr || !pr->performance || !pr->handle)
428 return -EINVAL;
429
430 if (!acpi_has_method(pr->handle, "_PCT")) {
431 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
432 "ACPI-based processor performance control unavailable\n"));
433 return -ENODEV;
434 }
435
436 result = acpi_processor_get_performance_control(pr);
437 if (result)
438 goto update_bios;
439
440 result = acpi_processor_get_performance_states(pr);
441 if (result)
442 goto update_bios;
443
444 /* We need to call _PPC once when cpufreq starts */
445 if (ignore_ppc != 1)
446 result = acpi_processor_get_platform_limit(pr);
447
448 return result;
449
450 /*
451 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
452 * the BIOS is older than the CPU and does not know its frequencies
453 */
454 update_bios:
455#ifdef CONFIG_X86
456 if (acpi_has_method(pr->handle, "_PPC")) {
457 if(boot_cpu_has(X86_FEATURE_EST))
458 printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
459 "frequency support\n");
460 }
461#endif
462 return result;
463}
464EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
465
466int acpi_processor_pstate_control(void)
467{
468 acpi_status status;
469
470 if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
471 return 0;
472
473 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
474 "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
475 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
476
477 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
478 (u32)acpi_gbl_FADT.pstate_control, 8);
479 if (ACPI_SUCCESS(status))
480 return 1;
481
482 ACPI_EXCEPTION((AE_INFO, status,
483 "Failed to write pstate_control [0x%x] to smi_command [0x%x]",
484 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
485 return -EIO;
486}
487
488int acpi_processor_notify_smm(struct module *calling_module)
489{
490 static int is_done = 0;
491 int result;
492
493 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
494 return -EBUSY;
495
496 if (!try_module_get(calling_module))
497 return -EINVAL;
498
499 /* is_done is set to negative if an error occurred,
500 * and to postitive if _no_ error occurred, but SMM
501 * was already notified. This avoids double notification
502 * which might lead to unexpected results...
503 */
504 if (is_done > 0) {
505 module_put(calling_module);
506 return 0;
507 } else if (is_done < 0) {
508 module_put(calling_module);
509 return is_done;
510 }
511
512 is_done = -EIO;
513
514 result = acpi_processor_pstate_control();
515 if (!result) {
516 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
517 module_put(calling_module);
518 return 0;
519 }
520 if (result < 0) {
521 module_put(calling_module);
522 return result;
523 }
524
525 /* Success. If there's no _PPC, we need to fear nothing, so
526 * we can allow the cpufreq driver to be rmmod'ed. */
527 is_done = 1;
528
529 if (!(acpi_processor_ppc_status & PPC_IN_USE))
530 module_put(calling_module);
531
532 return 0;
533}
534
535EXPORT_SYMBOL(acpi_processor_notify_smm);
536
537int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)
538{
539 int result = 0;
540 acpi_status status = AE_OK;
541 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
542 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
543 struct acpi_buffer state = {0, NULL};
544 union acpi_object *psd = NULL;
545
546 status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer);
547 if (ACPI_FAILURE(status)) {
548 return -ENODEV;
549 }
550
551 psd = buffer.pointer;
552 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
553 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
554 result = -EFAULT;
555 goto end;
556 }
557
558 if (psd->package.count != 1) {
559 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
560 result = -EFAULT;
561 goto end;
562 }
563
564 state.length = sizeof(struct acpi_psd_package);
565 state.pointer = pdomain;
566
567 status = acpi_extract_package(&(psd->package.elements[0]),
568 &format, &state);
569 if (ACPI_FAILURE(status)) {
570 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
571 result = -EFAULT;
572 goto end;
573 }
574
575 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
576 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
577 result = -EFAULT;
578 goto end;
579 }
580
581 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
582 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
583 result = -EFAULT;
584 goto end;
585 }
586
587 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
588 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
589 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
590 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
591 result = -EFAULT;
592 goto end;
593 }
594end:
595 kfree(buffer.pointer);
596 return result;
597}
598EXPORT_SYMBOL(acpi_processor_get_psd);
599
600int acpi_processor_preregister_performance(
601 struct acpi_processor_performance __percpu *performance)
602{
603 int count_target;
604 int retval = 0;
605 unsigned int i, j;
606 cpumask_var_t covered_cpus;
607 struct acpi_processor *pr;
608 struct acpi_psd_package *pdomain;
609 struct acpi_processor *match_pr;
610 struct acpi_psd_package *match_pdomain;
611
612 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
613 return -ENOMEM;
614
615 mutex_lock(&performance_mutex);
616
617 /*
618 * Check if another driver has already registered, and abort before
619 * changing pr->performance if it has. Check input data as well.
620 */
621 for_each_possible_cpu(i) {
622 pr = per_cpu(processors, i);
623 if (!pr) {
624 /* Look only at processors in ACPI namespace */
625 continue;
626 }
627
628 if (pr->performance) {
629 retval = -EBUSY;
630 goto err_out;
631 }
632
633 if (!performance || !per_cpu_ptr(performance, i)) {
634 retval = -EINVAL;
635 goto err_out;
636 }
637 }
638
639 /* Call _PSD for all CPUs */
640 for_each_possible_cpu(i) {
641 pr = per_cpu(processors, i);
642 if (!pr)
643 continue;
644
645 pr->performance = per_cpu_ptr(performance, i);
646 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
647 pdomain = &(pr->performance->domain_info);
648 if (acpi_processor_get_psd(pr->handle, pdomain)) {
649 retval = -EINVAL;
650 continue;
651 }
652 }
653 if (retval)
654 goto err_ret;
655
656 /*
657 * Now that we have _PSD data from all CPUs, lets setup P-state
658 * domain info.
659 */
660 for_each_possible_cpu(i) {
661 pr = per_cpu(processors, i);
662 if (!pr)
663 continue;
664
665 if (cpumask_test_cpu(i, covered_cpus))
666 continue;
667
668 pdomain = &(pr->performance->domain_info);
669 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
670 cpumask_set_cpu(i, covered_cpus);
671 if (pdomain->num_processors <= 1)
672 continue;
673
674 /* Validate the Domain info */
675 count_target = pdomain->num_processors;
676 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
677 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
678 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
679 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
680 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
681 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
682
683 for_each_possible_cpu(j) {
684 if (i == j)
685 continue;
686
687 match_pr = per_cpu(processors, j);
688 if (!match_pr)
689 continue;
690
691 match_pdomain = &(match_pr->performance->domain_info);
692 if (match_pdomain->domain != pdomain->domain)
693 continue;
694
695 /* Here i and j are in the same domain */
696
697 if (match_pdomain->num_processors != count_target) {
698 retval = -EINVAL;
699 goto err_ret;
700 }
701
702 if (pdomain->coord_type != match_pdomain->coord_type) {
703 retval = -EINVAL;
704 goto err_ret;
705 }
706
707 cpumask_set_cpu(j, covered_cpus);
708 cpumask_set_cpu(j, pr->performance->shared_cpu_map);
709 }
710
711 for_each_possible_cpu(j) {
712 if (i == j)
713 continue;
714
715 match_pr = per_cpu(processors, j);
716 if (!match_pr)
717 continue;
718
719 match_pdomain = &(match_pr->performance->domain_info);
720 if (match_pdomain->domain != pdomain->domain)
721 continue;
722
723 match_pr->performance->shared_type =
724 pr->performance->shared_type;
725 cpumask_copy(match_pr->performance->shared_cpu_map,
726 pr->performance->shared_cpu_map);
727 }
728 }
729
730err_ret:
731 for_each_possible_cpu(i) {
732 pr = per_cpu(processors, i);
733 if (!pr || !pr->performance)
734 continue;
735
736 /* Assume no coordination on any error parsing domain info */
737 if (retval) {
738 cpumask_clear(pr->performance->shared_cpu_map);
739 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
740 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
741 }
742 pr->performance = NULL; /* Will be set for real in register */
743 }
744
745err_out:
746 mutex_unlock(&performance_mutex);
747 free_cpumask_var(covered_cpus);
748 return retval;
749}
750EXPORT_SYMBOL(acpi_processor_preregister_performance);
751
752int
753acpi_processor_register_performance(struct acpi_processor_performance
754 *performance, unsigned int cpu)
755{
756 struct acpi_processor *pr;
757
758 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
759 return -EINVAL;
760
761 mutex_lock(&performance_mutex);
762
763 pr = per_cpu(processors, cpu);
764 if (!pr) {
765 mutex_unlock(&performance_mutex);
766 return -ENODEV;
767 }
768
769 if (pr->performance) {
770 mutex_unlock(&performance_mutex);
771 return -EBUSY;
772 }
773
774 WARN_ON(!performance);
775
776 pr->performance = performance;
777
778 if (acpi_processor_get_performance_info(pr)) {
779 pr->performance = NULL;
780 mutex_unlock(&performance_mutex);
781 return -EIO;
782 }
783
784 mutex_unlock(&performance_mutex);
785 return 0;
786}
787
788EXPORT_SYMBOL(acpi_processor_register_performance);
789
790void acpi_processor_unregister_performance(unsigned int cpu)
791{
792 struct acpi_processor *pr;
793
794 mutex_lock(&performance_mutex);
795
796 pr = per_cpu(processors, cpu);
797 if (!pr) {
798 mutex_unlock(&performance_mutex);
799 return;
800 }
801
802 if (pr->performance)
803 kfree(pr->performance->states);
804 pr->performance = NULL;
805
806 mutex_unlock(&performance_mutex);
807
808 return;
809}
810
811EXPORT_SYMBOL(acpi_processor_unregister_performance);
812