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