Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
[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 /*
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  */
68 static int ignore_ppc = -1;
69 module_param(ignore_ppc, int, 0644);
70 MODULE_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
76 static int acpi_processor_ppc_status;
77
78 static 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
117 static struct notifier_block acpi_ppc_notifier_block = {
118         .notifier_call = acpi_processor_ppc_notifier,
119 };
120
121 static 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  */
160 static 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
180 int 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
211 int 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 }
222 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
223
224 void 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
234 void 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
243 static 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
305 static 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
389 static 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
434 int 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
493 EXPORT_SYMBOL(acpi_processor_notify_smm);
494
495 static 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         }
555 end:
556         kfree(buffer.pointer);
557         return result;
558 }
559
560 int 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
691 err_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
706 err_out:
707         mutex_unlock(&performance_mutex);
708         free_cpumask_var(covered_cpus);
709         return retval;
710 }
711 EXPORT_SYMBOL(acpi_processor_preregister_performance);
712
713 int
714 acpi_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
749 EXPORT_SYMBOL(acpi_processor_register_performance);
750
751 void
752 acpi_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
774 EXPORT_SYMBOL(acpi_processor_unregister_performance);