ACPI: Fix regression where _PPC is not read at boot even when ignore_ppc=0
[linux-2.6.git] / drivers / acpi / processor_perflib.c
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
34 #ifdef CONFIG_X86
35 #include <asm/cpufeature.h>
36 #endif
37
38 #include <acpi/acpi_bus.h>
39 #include <acpi/acpi_drivers.h>
40 #include <acpi/processor.h>
41
42 #define PREFIX "ACPI: "
43
44 #define ACPI_PROCESSOR_CLASS            "processor"
45 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
46 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
47 ACPI_MODULE_NAME("processor_perflib");
48
49 static DEFINE_MUTEX(performance_mutex);
50
51 /* Use cpufreq debug layer for _PPC changes. */
52 #define cpufreq_printk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, \
53                                                 "cpufreq-core", msg)
54
55 /*
56  * _PPC support is implemented as a CPUfreq policy notifier:
57  * This means each time a CPUfreq driver registered also with
58  * the ACPI core is asked to change the speed policy, the maximum
59  * value is adjusted so that it is within the platform limit.
60  *
61  * Also, when a new platform limit value is detected, the CPUfreq
62  * policy is adjusted accordingly.
63  */
64
65 /* ignore_ppc:
66  * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
67  *       ignore _PPC
68  *  0 -> cpufreq low level drivers initialized -> consider _PPC values
69  *  1 -> ignore _PPC totally -> forced by user through boot param
70  */
71 static int ignore_ppc = -1;
72 module_param(ignore_ppc, int, 0644);
73 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
74                  "limited by BIOS, this should help");
75
76 #define PPC_REGISTERED   1
77 #define PPC_IN_USE       2
78
79 static int acpi_processor_ppc_status;
80
81 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
82                                        unsigned long event, void *data)
83 {
84         struct cpufreq_policy *policy = data;
85         struct acpi_processor *pr;
86         unsigned int ppc = 0;
87
88         if (event == CPUFREQ_START && ignore_ppc <= 0) {
89                 ignore_ppc = 0;
90                 return 0;
91         }
92
93         if (ignore_ppc)
94                 return 0;
95
96         if (event != CPUFREQ_INCOMPATIBLE)
97                 return 0;
98
99         mutex_lock(&performance_mutex);
100
101         pr = per_cpu(processors, policy->cpu);
102         if (!pr || !pr->performance)
103                 goto out;
104
105         ppc = (unsigned int)pr->performance_platform_limit;
106
107         if (ppc >= pr->performance->state_count)
108                 goto out;
109
110         cpufreq_verify_within_limits(policy, 0,
111                                      pr->performance->states[ppc].
112                                      core_frequency * 1000);
113
114       out:
115         mutex_unlock(&performance_mutex);
116
117         return 0;
118 }
119
120 static struct notifier_block acpi_ppc_notifier_block = {
121         .notifier_call = acpi_processor_ppc_notifier,
122 };
123
124 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
125 {
126         acpi_status status = 0;
127         unsigned long long ppc = 0;
128
129
130         if (!pr)
131                 return -EINVAL;
132
133         /*
134          * _PPC indicates the maximum state currently supported by the platform
135          * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
136          */
137         status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
138
139         if (status != AE_NOT_FOUND)
140                 acpi_processor_ppc_status |= PPC_IN_USE;
141
142         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
143                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
144                 return -ENODEV;
145         }
146
147         cpufreq_printk("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
148                        (int)ppc, ppc ? "" : "not");
149
150         pr->performance_platform_limit = (int)ppc;
151
152         return 0;
153 }
154
155 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE       0x80
156 /*
157  * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
158  * @handle: ACPI processor handle
159  * @status: the status code of _PPC evaluation
160  *      0: success. OSPM is now using the performance state specificed.
161  *      1: failure. OSPM has not changed the number of P-states in use
162  */
163 static void acpi_processor_ppc_ost(acpi_handle handle, int status)
164 {
165         union acpi_object params[2] = {
166                 {.type = ACPI_TYPE_INTEGER,},
167                 {.type = ACPI_TYPE_INTEGER,},
168         };
169         struct acpi_object_list arg_list = {2, params};
170         acpi_handle temp;
171
172         params[0].integer.value = ACPI_PROCESSOR_NOTIFY_PERFORMANCE;
173         params[1].integer.value =  status;
174
175         /* when there is no _OST , skip it */
176         if (ACPI_FAILURE(acpi_get_handle(handle, "_OST", &temp)))
177                 return;
178
179         acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
180         return;
181 }
182
183 int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
184 {
185         int ret;
186
187         if (ignore_ppc) {
188                 /*
189                  * Only when it is notification event, the _OST object
190                  * will be evaluated. Otherwise it is skipped.
191                  */
192                 if (event_flag)
193                         acpi_processor_ppc_ost(pr->handle, 1);
194                 return 0;
195         }
196
197         ret = acpi_processor_get_platform_limit(pr);
198         /*
199          * Only when it is notification event, the _OST object
200          * will be evaluated. Otherwise it is skipped.
201          */
202         if (event_flag) {
203                 if (ret < 0)
204                         acpi_processor_ppc_ost(pr->handle, 1);
205                 else
206                         acpi_processor_ppc_ost(pr->handle, 0);
207         }
208         if (ret < 0)
209                 return (ret);
210         else
211                 return cpufreq_update_policy(pr->id);
212 }
213
214 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
215 {
216         struct acpi_processor *pr;
217
218         pr = per_cpu(processors, cpu);
219         if (!pr || !pr->performance || !pr->performance->state_count)
220                 return -ENODEV;
221         *limit = pr->performance->states[pr->performance_platform_limit].
222                 core_frequency * 1000;
223         return 0;
224 }
225 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
226
227 void acpi_processor_ppc_init(void)
228 {
229         if (!cpufreq_register_notifier
230             (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
231                 acpi_processor_ppc_status |= PPC_REGISTERED;
232         else
233                 printk(KERN_DEBUG
234                        "Warning: Processor Platform Limit not supported.\n");
235 }
236
237 void acpi_processor_ppc_exit(void)
238 {
239         if (acpi_processor_ppc_status & PPC_REGISTERED)
240                 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
241                                             CPUFREQ_POLICY_NOTIFIER);
242
243         acpi_processor_ppc_status &= ~PPC_REGISTERED;
244 }
245
246 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
247 {
248         int result = 0;
249         acpi_status status = 0;
250         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
251         union acpi_object *pct = NULL;
252         union acpi_object obj = { 0 };
253
254
255         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
256         if (ACPI_FAILURE(status)) {
257                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
258                 return -ENODEV;
259         }
260
261         pct = (union acpi_object *)buffer.pointer;
262         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
263             || (pct->package.count != 2)) {
264                 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
265                 result = -EFAULT;
266                 goto end;
267         }
268
269         /*
270          * control_register
271          */
272
273         obj = pct->package.elements[0];
274
275         if ((obj.type != ACPI_TYPE_BUFFER)
276             || (obj.buffer.length < sizeof(struct acpi_pct_register))
277             || (obj.buffer.pointer == NULL)) {
278                 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
279                 result = -EFAULT;
280                 goto end;
281         }
282         memcpy(&pr->performance->control_register, obj.buffer.pointer,
283                sizeof(struct acpi_pct_register));
284
285         /*
286          * status_register
287          */
288
289         obj = pct->package.elements[1];
290
291         if ((obj.type != ACPI_TYPE_BUFFER)
292             || (obj.buffer.length < sizeof(struct acpi_pct_register))
293             || (obj.buffer.pointer == NULL)) {
294                 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
295                 result = -EFAULT;
296                 goto end;
297         }
298
299         memcpy(&pr->performance->status_register, obj.buffer.pointer,
300                sizeof(struct acpi_pct_register));
301
302       end:
303         kfree(buffer.pointer);
304
305         return result;
306 }
307
308 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
309 {
310         int result = 0;
311         acpi_status status = AE_OK;
312         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
313         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
314         struct acpi_buffer state = { 0, NULL };
315         union acpi_object *pss = NULL;
316         int i;
317
318
319         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
320         if (ACPI_FAILURE(status)) {
321                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
322                 return -ENODEV;
323         }
324
325         pss = buffer.pointer;
326         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
327                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
328                 result = -EFAULT;
329                 goto end;
330         }
331
332         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
333                           pss->package.count));
334
335         pr->performance->state_count = pss->package.count;
336         pr->performance->states =
337             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
338                     GFP_KERNEL);
339         if (!pr->performance->states) {
340                 result = -ENOMEM;
341                 goto end;
342         }
343
344         for (i = 0; i < pr->performance->state_count; i++) {
345
346                 struct acpi_processor_px *px = &(pr->performance->states[i]);
347
348                 state.length = sizeof(struct acpi_processor_px);
349                 state.pointer = px;
350
351                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
352
353                 status = acpi_extract_package(&(pss->package.elements[i]),
354                                               &format, &state);
355                 if (ACPI_FAILURE(status)) {
356                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
357                         result = -EFAULT;
358                         kfree(pr->performance->states);
359                         goto end;
360                 }
361
362                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
363                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
364                                   i,
365                                   (u32) px->core_frequency,
366                                   (u32) px->power,
367                                   (u32) px->transition_latency,
368                                   (u32) px->bus_master_latency,
369                                   (u32) px->control, (u32) px->status));
370
371                 /*
372                  * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
373                  */
374                 if (!px->core_frequency ||
375                     ((u32)(px->core_frequency * 1000) !=
376                      (px->core_frequency * 1000))) {
377                         printk(KERN_ERR FW_BUG PREFIX
378                                "Invalid BIOS _PSS frequency: 0x%llx MHz\n",
379                                px->core_frequency);
380                         result = -EFAULT;
381                         kfree(pr->performance->states);
382                         goto end;
383                 }
384         }
385
386       end:
387         kfree(buffer.pointer);
388
389         return result;
390 }
391
392 static int acpi_processor_get_performance_info(struct acpi_processor *pr)
393 {
394         int result = 0;
395         acpi_status status = AE_OK;
396         acpi_handle handle = NULL;
397
398         if (!pr || !pr->performance || !pr->handle)
399                 return -EINVAL;
400
401         status = acpi_get_handle(pr->handle, "_PCT", &handle);
402         if (ACPI_FAILURE(status)) {
403                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
404                                   "ACPI-based processor performance control unavailable\n"));
405                 return -ENODEV;
406         }
407
408         result = acpi_processor_get_performance_control(pr);
409         if (result)
410                 goto update_bios;
411
412         result = acpi_processor_get_performance_states(pr);
413         if (result)
414                 goto update_bios;
415
416         /* We need to call _PPC once when cpufreq starts */
417         if (ignore_ppc != 1)
418                 result = acpi_processor_get_platform_limit(pr);
419
420         return result;
421
422         /*
423          * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
424          * the BIOS is older than the CPU and does not know its frequencies
425          */
426  update_bios:
427 #ifdef CONFIG_X86
428         if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){
429                 if(boot_cpu_has(X86_FEATURE_EST))
430                         printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
431                                "frequency support\n");
432         }
433 #endif
434         return result;
435 }
436
437 int acpi_processor_notify_smm(struct module *calling_module)
438 {
439         acpi_status status;
440         static int is_done = 0;
441
442
443         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
444                 return -EBUSY;
445
446         if (!try_module_get(calling_module))
447                 return -EINVAL;
448
449         /* is_done is set to negative if an error occured,
450          * and to postitive if _no_ error occured, but SMM
451          * was already notified. This avoids double notification
452          * which might lead to unexpected results...
453          */
454         if (is_done > 0) {
455                 module_put(calling_module);
456                 return 0;
457         } else if (is_done < 0) {
458                 module_put(calling_module);
459                 return is_done;
460         }
461
462         is_done = -EIO;
463
464         /* Can't write pstate_control to smi_command if either value is zero */
465         if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
466                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
467                 module_put(calling_module);
468                 return 0;
469         }
470
471         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
472                           "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
473                           acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
474
475         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
476                                     (u32) acpi_gbl_FADT.pstate_control, 8);
477         if (ACPI_FAILURE(status)) {
478                 ACPI_EXCEPTION((AE_INFO, status,
479                                 "Failed to write pstate_control [0x%x] to "
480                                 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
481                                 acpi_gbl_FADT.smi_command));
482                 module_put(calling_module);
483                 return status;
484         }
485
486         /* Success. If there's no _PPC, we need to fear nothing, so
487          * we can allow the cpufreq driver to be rmmod'ed. */
488         is_done = 1;
489
490         if (!(acpi_processor_ppc_status & PPC_IN_USE))
491                 module_put(calling_module);
492
493         return 0;
494 }
495
496 EXPORT_SYMBOL(acpi_processor_notify_smm);
497
498 static int acpi_processor_get_psd(struct acpi_processor *pr)
499 {
500         int result = 0;
501         acpi_status status = AE_OK;
502         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
503         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
504         struct acpi_buffer state = {0, NULL};
505         union acpi_object  *psd = NULL;
506         struct acpi_psd_package *pdomain;
507
508         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
509         if (ACPI_FAILURE(status)) {
510                 return -ENODEV;
511         }
512
513         psd = buffer.pointer;
514         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
515                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
516                 result = -EFAULT;
517                 goto end;
518         }
519
520         if (psd->package.count != 1) {
521                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
522                 result = -EFAULT;
523                 goto end;
524         }
525
526         pdomain = &(pr->performance->domain_info);
527
528         state.length = sizeof(struct acpi_psd_package);
529         state.pointer = pdomain;
530
531         status = acpi_extract_package(&(psd->package.elements[0]),
532                 &format, &state);
533         if (ACPI_FAILURE(status)) {
534                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
535                 result = -EFAULT;
536                 goto end;
537         }
538
539         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
540                 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
541                 result = -EFAULT;
542                 goto end;
543         }
544
545         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
546                 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
547                 result = -EFAULT;
548                 goto end;
549         }
550
551         if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
552             pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
553             pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
554                 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
555                 result = -EFAULT;
556                 goto end;
557         }
558 end:
559         kfree(buffer.pointer);
560         return result;
561 }
562
563 int acpi_processor_preregister_performance(
564                 struct acpi_processor_performance *performance)
565 {
566         int count, 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                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
610                 if (acpi_processor_get_psd(pr)) {
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                 count = 1;
639                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
640                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
641                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
642                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
643                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
644                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
645
646                 for_each_possible_cpu(j) {
647                         if (i == j)
648                                 continue;
649
650                         match_pr = per_cpu(processors, j);
651                         if (!match_pr)
652                                 continue;
653
654                         match_pdomain = &(match_pr->performance->domain_info);
655                         if (match_pdomain->domain != pdomain->domain)
656                                 continue;
657
658                         /* Here i and j are in the same domain */
659
660                         if (match_pdomain->num_processors != count_target) {
661                                 retval = -EINVAL;
662                                 goto err_ret;
663                         }
664
665                         if (pdomain->coord_type != match_pdomain->coord_type) {
666                                 retval = -EINVAL;
667                                 goto err_ret;
668                         }
669
670                         cpumask_set_cpu(j, covered_cpus);
671                         cpumask_set_cpu(j, pr->performance->shared_cpu_map);
672                         count++;
673                 }
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                         match_pr->performance->shared_type = 
688                                         pr->performance->shared_type;
689                         cpumask_copy(match_pr->performance->shared_cpu_map,
690                                      pr->performance->shared_cpu_map);
691                 }
692         }
693
694 err_ret:
695         for_each_possible_cpu(i) {
696                 pr = per_cpu(processors, i);
697                 if (!pr || !pr->performance)
698                         continue;
699
700                 /* Assume no coordination on any error parsing domain info */
701                 if (retval) {
702                         cpumask_clear(pr->performance->shared_cpu_map);
703                         cpumask_set_cpu(i, pr->performance->shared_cpu_map);
704                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
705                 }
706                 pr->performance = NULL; /* Will be set for real in register */
707         }
708
709 err_out:
710         mutex_unlock(&performance_mutex);
711         free_cpumask_var(covered_cpus);
712         return retval;
713 }
714 EXPORT_SYMBOL(acpi_processor_preregister_performance);
715
716 int
717 acpi_processor_register_performance(struct acpi_processor_performance
718                                     *performance, unsigned int cpu)
719 {
720         struct acpi_processor *pr;
721
722         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
723                 return -EINVAL;
724
725         mutex_lock(&performance_mutex);
726
727         pr = per_cpu(processors, cpu);
728         if (!pr) {
729                 mutex_unlock(&performance_mutex);
730                 return -ENODEV;
731         }
732
733         if (pr->performance) {
734                 mutex_unlock(&performance_mutex);
735                 return -EBUSY;
736         }
737
738         WARN_ON(!performance);
739
740         pr->performance = performance;
741
742         if (acpi_processor_get_performance_info(pr)) {
743                 pr->performance = NULL;
744                 mutex_unlock(&performance_mutex);
745                 return -EIO;
746         }
747
748         mutex_unlock(&performance_mutex);
749         return 0;
750 }
751
752 EXPORT_SYMBOL(acpi_processor_register_performance);
753
754 void
755 acpi_processor_unregister_performance(struct acpi_processor_performance
756                                       *performance, unsigned int cpu)
757 {
758         struct acpi_processor *pr;
759
760         mutex_lock(&performance_mutex);
761
762         pr = per_cpu(processors, cpu);
763         if (!pr) {
764                 mutex_unlock(&performance_mutex);
765                 return;
766         }
767
768         if (pr->performance)
769                 kfree(pr->performance->states);
770         pr->performance = NULL;
771
772         mutex_unlock(&performance_mutex);
773
774         return;
775 }
776
777 EXPORT_SYMBOL(acpi_processor_unregister_performance);