aabb98832ba65338554947ce5397f8cd2356d0e4
[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_ACPI_CPUFREQ_PROC_INTF
35 #include <linux/proc_fs.h>
36 #include <linux/seq_file.h>
37 #include <linux/mutex.h>
38
39 #include <asm/uaccess.h>
40 #endif
41
42 #include <acpi/acpi_bus.h>
43 #include <acpi/processor.h>
44
45 #define ACPI_PROCESSOR_COMPONENT        0x01000000
46 #define ACPI_PROCESSOR_CLASS            "processor"
47 #define ACPI_PROCESSOR_DRIVER_NAME      "ACPI Processor Driver"
48 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
49 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
50 ACPI_MODULE_NAME("acpi_processor")
51
52 static DEFINE_MUTEX(performance_mutex);
53
54 /*
55  * _PPC support is implemented as a CPUfreq policy notifier:
56  * This means each time a CPUfreq driver registered also with
57  * the ACPI core is asked to change the speed policy, the maximum
58  * value is adjusted so that it is within the platform limit.
59  *
60  * Also, when a new platform limit value is detected, the CPUfreq
61  * policy is adjusted accordingly.
62  */
63
64 #define PPC_REGISTERED   1
65 #define PPC_IN_USE       2
66
67 static int acpi_processor_ppc_status = 0;
68
69 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
70                                        unsigned long event, void *data)
71 {
72         struct cpufreq_policy *policy = data;
73         struct acpi_processor *pr;
74         unsigned int ppc = 0;
75
76         mutex_lock(&performance_mutex);
77
78         if (event != CPUFREQ_INCOMPATIBLE)
79                 goto out;
80
81         pr = processors[policy->cpu];
82         if (!pr || !pr->performance)
83                 goto out;
84
85         ppc = (unsigned int)pr->performance_platform_limit;
86
87         if (ppc >= pr->performance->state_count)
88                 goto out;
89
90         cpufreq_verify_within_limits(policy, 0,
91                                      pr->performance->states[ppc].
92                                      core_frequency * 1000);
93
94       out:
95         mutex_unlock(&performance_mutex);
96
97         return 0;
98 }
99
100 static struct notifier_block acpi_ppc_notifier_block = {
101         .notifier_call = acpi_processor_ppc_notifier,
102 };
103
104 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
105 {
106         acpi_status status = 0;
107         unsigned long ppc = 0;
108
109
110         if (!pr)
111                 return -EINVAL;
112
113         /*
114          * _PPC indicates the maximum state currently supported by the platform
115          * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
116          */
117         status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
118
119         if (status != AE_NOT_FOUND)
120                 acpi_processor_ppc_status |= PPC_IN_USE;
121
122         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
123                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
124                 return -ENODEV;
125         }
126
127         pr->performance_platform_limit = (int)ppc;
128
129         return 0;
130 }
131
132 int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
133 {
134         int ret = acpi_processor_get_platform_limit(pr);
135         if (ret < 0)
136                 return (ret);
137         else
138                 return cpufreq_update_policy(pr->id);
139 }
140
141 void acpi_processor_ppc_init(void)
142 {
143         if (!cpufreq_register_notifier
144             (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
145                 acpi_processor_ppc_status |= PPC_REGISTERED;
146         else
147                 printk(KERN_DEBUG
148                        "Warning: Processor Platform Limit not supported.\n");
149 }
150
151 void acpi_processor_ppc_exit(void)
152 {
153         if (acpi_processor_ppc_status & PPC_REGISTERED)
154                 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
155                                             CPUFREQ_POLICY_NOTIFIER);
156
157         acpi_processor_ppc_status &= ~PPC_REGISTERED;
158 }
159
160 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
161 {
162         int result = 0;
163         acpi_status status = 0;
164         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
165         union acpi_object *pct = NULL;
166         union acpi_object obj = { 0 };
167
168
169         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
170         if (ACPI_FAILURE(status)) {
171                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
172                 return -ENODEV;
173         }
174
175         pct = (union acpi_object *)buffer.pointer;
176         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
177             || (pct->package.count != 2)) {
178                 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
179                 result = -EFAULT;
180                 goto end;
181         }
182
183         /*
184          * control_register
185          */
186
187         obj = pct->package.elements[0];
188
189         if ((obj.type != ACPI_TYPE_BUFFER)
190             || (obj.buffer.length < sizeof(struct acpi_pct_register))
191             || (obj.buffer.pointer == NULL)) {
192                 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
193                 result = -EFAULT;
194                 goto end;
195         }
196         memcpy(&pr->performance->control_register, obj.buffer.pointer,
197                sizeof(struct acpi_pct_register));
198
199         /*
200          * status_register
201          */
202
203         obj = pct->package.elements[1];
204
205         if ((obj.type != ACPI_TYPE_BUFFER)
206             || (obj.buffer.length < sizeof(struct acpi_pct_register))
207             || (obj.buffer.pointer == NULL)) {
208                 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
209                 result = -EFAULT;
210                 goto end;
211         }
212
213         memcpy(&pr->performance->status_register, obj.buffer.pointer,
214                sizeof(struct acpi_pct_register));
215
216       end:
217         kfree(buffer.pointer);
218
219         return result;
220 }
221
222 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
223 {
224         int result = 0;
225         acpi_status status = AE_OK;
226         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
227         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
228         struct acpi_buffer state = { 0, NULL };
229         union acpi_object *pss = NULL;
230         int i;
231
232
233         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
234         if (ACPI_FAILURE(status)) {
235                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
236                 return -ENODEV;
237         }
238
239         pss = buffer.pointer;
240         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
241                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
242                 result = -EFAULT;
243                 goto end;
244         }
245
246         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
247                           pss->package.count));
248
249         pr->performance->state_count = pss->package.count;
250         pr->performance->states =
251             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
252                     GFP_KERNEL);
253         if (!pr->performance->states) {
254                 result = -ENOMEM;
255                 goto end;
256         }
257
258         for (i = 0; i < pr->performance->state_count; i++) {
259
260                 struct acpi_processor_px *px = &(pr->performance->states[i]);
261
262                 state.length = sizeof(struct acpi_processor_px);
263                 state.pointer = px;
264
265                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
266
267                 status = acpi_extract_package(&(pss->package.elements[i]),
268                                               &format, &state);
269                 if (ACPI_FAILURE(status)) {
270                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
271                         result = -EFAULT;
272                         kfree(pr->performance->states);
273                         goto end;
274                 }
275
276                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
277                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
278                                   i,
279                                   (u32) px->core_frequency,
280                                   (u32) px->power,
281                                   (u32) px->transition_latency,
282                                   (u32) px->bus_master_latency,
283                                   (u32) px->control, (u32) px->status));
284
285                 if (!px->core_frequency) {
286                         printk(KERN_ERR PREFIX
287                                     "Invalid _PSS data: freq is zero\n");
288                         result = -EFAULT;
289                         kfree(pr->performance->states);
290                         goto end;
291                 }
292         }
293
294       end:
295         kfree(buffer.pointer);
296
297         return result;
298 }
299
300 static int acpi_processor_get_performance_info(struct acpi_processor *pr)
301 {
302         int result = 0;
303         acpi_status status = AE_OK;
304         acpi_handle handle = NULL;
305
306
307         if (!pr || !pr->performance || !pr->handle)
308                 return -EINVAL;
309
310         status = acpi_get_handle(pr->handle, "_PCT", &handle);
311         if (ACPI_FAILURE(status)) {
312                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
313                                   "ACPI-based processor performance control unavailable\n"));
314                 return -ENODEV;
315         }
316
317         result = acpi_processor_get_performance_control(pr);
318         if (result)
319                 return result;
320
321         result = acpi_processor_get_performance_states(pr);
322         if (result)
323                 return result;
324
325         return 0;
326 }
327
328 int acpi_processor_notify_smm(struct module *calling_module)
329 {
330         acpi_status status;
331         static int is_done = 0;
332
333
334         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
335                 return -EBUSY;
336
337         if (!try_module_get(calling_module))
338                 return -EINVAL;
339
340         /* is_done is set to negative if an error occured,
341          * and to postitive if _no_ error occured, but SMM
342          * was already notified. This avoids double notification
343          * which might lead to unexpected results...
344          */
345         if (is_done > 0) {
346                 module_put(calling_module);
347                 return 0;
348         } else if (is_done < 0) {
349                 module_put(calling_module);
350                 return is_done;
351         }
352
353         is_done = -EIO;
354
355         /* Can't write pstate_control to smi_command if either value is zero */
356         if ((!acpi_fadt.smi_command) || (!acpi_fadt.pstate_control)) {
357                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
358                 module_put(calling_module);
359                 return 0;
360         }
361
362         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
363                           "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
364                           acpi_fadt.pstate_control, acpi_fadt.smi_command));
365
366         status = acpi_os_write_port(acpi_fadt.smi_command,
367                                     (u32) acpi_fadt.pstate_control, 8);
368         if (ACPI_FAILURE(status)) {
369                 ACPI_EXCEPTION((AE_INFO, status,
370                                 "Failed to write pstate_control [0x%x] to "
371                                 "smi_command [0x%x]", acpi_fadt.pstate_control,
372                                 acpi_fadt.smi_command));
373                 module_put(calling_module);
374                 return status;
375         }
376
377         /* Success. If there's no _PPC, we need to fear nothing, so
378          * we can allow the cpufreq driver to be rmmod'ed. */
379         is_done = 1;
380
381         if (!(acpi_processor_ppc_status & PPC_IN_USE))
382                 module_put(calling_module);
383
384         return 0;
385 }
386
387 EXPORT_SYMBOL(acpi_processor_notify_smm);
388
389 #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
390 /* /proc/acpi/processor/../performance interface (DEPRECATED) */
391
392 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file);
393 static struct file_operations acpi_processor_perf_fops = {
394         .open = acpi_processor_perf_open_fs,
395         .read = seq_read,
396         .llseek = seq_lseek,
397         .release = single_release,
398 };
399
400 static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset)
401 {
402         struct acpi_processor *pr = seq->private;
403         int i;
404
405
406         if (!pr)
407                 goto end;
408
409         if (!pr->performance) {
410                 seq_puts(seq, "<not supported>\n");
411                 goto end;
412         }
413
414         seq_printf(seq, "state count:             %d\n"
415                    "active state:            P%d\n",
416                    pr->performance->state_count, pr->performance->state);
417
418         seq_puts(seq, "states:\n");
419         for (i = 0; i < pr->performance->state_count; i++)
420                 seq_printf(seq,
421                            "   %cP%d:                  %d MHz, %d mW, %d uS\n",
422                            (i == pr->performance->state ? '*' : ' '), i,
423                            (u32) pr->performance->states[i].core_frequency,
424                            (u32) pr->performance->states[i].power,
425                            (u32) pr->performance->states[i].transition_latency);
426
427       end:
428         return 0;
429 }
430
431 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file)
432 {
433         return single_open(file, acpi_processor_perf_seq_show,
434                            PDE(inode)->data);
435 }
436
437 static ssize_t
438 acpi_processor_write_performance(struct file *file,
439                                  const char __user * buffer,
440                                  size_t count, loff_t * data)
441 {
442         int result = 0;
443         struct seq_file *m = file->private_data;
444         struct acpi_processor *pr = m->private;
445         struct acpi_processor_performance *perf;
446         char state_string[12] = { '\0' };
447         unsigned int new_state = 0;
448         struct cpufreq_policy policy;
449
450
451         if (!pr || (count > sizeof(state_string) - 1))
452                 return -EINVAL;
453
454         perf = pr->performance;
455         if (!perf)
456                 return -EINVAL;
457
458         if (copy_from_user(state_string, buffer, count))
459                 return -EFAULT;
460
461         state_string[count] = '\0';
462         new_state = simple_strtoul(state_string, NULL, 0);
463
464         if (new_state >= perf->state_count)
465                 return -EINVAL;
466
467         cpufreq_get_policy(&policy, pr->id);
468
469         policy.cpu = pr->id;
470         policy.min = perf->states[new_state].core_frequency * 1000;
471         policy.max = perf->states[new_state].core_frequency * 1000;
472
473         result = cpufreq_set_policy(&policy);
474         if (result)
475                 return result;
476
477         return count;
478 }
479
480 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
481 {
482         struct proc_dir_entry *entry = NULL;
483         struct acpi_device *device = NULL;
484
485
486         if (acpi_bus_get_device(pr->handle, &device))
487                 return;
488
489         /* add file 'performance' [R/W] */
490         entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
491                                   S_IFREG | S_IRUGO | S_IWUSR,
492                                   acpi_device_dir(device));
493         if (entry){
494                 acpi_processor_perf_fops.write = acpi_processor_write_performance;
495                 entry->proc_fops = &acpi_processor_perf_fops;
496                 entry->data = acpi_driver_data(device);
497                 entry->owner = THIS_MODULE;
498         }
499         return;
500 }
501
502 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
503 {
504         struct acpi_device *device = NULL;
505
506
507         if (acpi_bus_get_device(pr->handle, &device))
508                 return;
509
510         /* remove file 'performance' */
511         remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
512                           acpi_device_dir(device));
513
514         return;
515 }
516
517 #else
518 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
519 {
520         return;
521 }
522 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
523 {
524         return;
525 }
526 #endif                          /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
527
528 static int acpi_processor_get_psd(struct acpi_processor *pr)
529 {
530         int result = 0;
531         acpi_status status = AE_OK;
532         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
533         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
534         struct acpi_buffer state = {0, NULL};
535         union acpi_object  *psd = NULL;
536         struct acpi_psd_package *pdomain;
537
538         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
539         if (ACPI_FAILURE(status)) {
540                 return -ENODEV;
541         }
542
543         psd = buffer.pointer;
544         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
545                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
546                 result = -EFAULT;
547                 goto end;
548         }
549
550         if (psd->package.count != 1) {
551                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
552                 result = -EFAULT;
553                 goto end;
554         }
555
556         pdomain = &(pr->performance->domain_info);
557
558         state.length = sizeof(struct acpi_psd_package);
559         state.pointer = pdomain;
560
561         status = acpi_extract_package(&(psd->package.elements[0]),
562                 &format, &state);
563         if (ACPI_FAILURE(status)) {
564                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
565                 result = -EFAULT;
566                 goto end;
567         }
568
569         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
570                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n"));
571                 result = -EFAULT;
572                 goto end;
573         }
574
575         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
576                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n"));
577                 result = -EFAULT;
578                 goto end;
579         }
580
581 end:
582         kfree(buffer.pointer);
583         return result;
584 }
585
586 int acpi_processor_preregister_performance(
587                 struct acpi_processor_performance **performance)
588 {
589         int count, count_target;
590         int retval = 0;
591         unsigned int i, j;
592         cpumask_t covered_cpus;
593         struct acpi_processor *pr;
594         struct acpi_psd_package *pdomain;
595         struct acpi_processor *match_pr;
596         struct acpi_psd_package *match_pdomain;
597
598         mutex_lock(&performance_mutex);
599
600         retval = 0;
601
602         /* Call _PSD for all CPUs */
603         for_each_possible_cpu(i) {
604                 pr = processors[i];
605                 if (!pr) {
606                         /* Look only at processors in ACPI namespace */
607                         continue;
608                 }
609
610                 if (pr->performance) {
611                         retval = -EBUSY;
612                         continue;
613                 }
614
615                 if (!performance || !performance[i]) {
616                         retval = -EINVAL;
617                         continue;
618                 }
619
620                 pr->performance = performance[i];
621                 cpu_set(i, pr->performance->shared_cpu_map);
622                 if (acpi_processor_get_psd(pr)) {
623                         retval = -EINVAL;
624                         continue;
625                 }
626         }
627         if (retval)
628                 goto err_ret;
629
630         /*
631          * Now that we have _PSD data from all CPUs, lets setup P-state 
632          * domain info.
633          */
634         for_each_possible_cpu(i) {
635                 pr = processors[i];
636                 if (!pr)
637                         continue;
638
639                 /* Basic validity check for domain info */
640                 pdomain = &(pr->performance->domain_info);
641                 if ((pdomain->revision != ACPI_PSD_REV0_REVISION) ||
642                     (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) {
643                         retval = -EINVAL;
644                         goto err_ret;
645                 }
646                 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
647                     pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
648                     pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
649                         retval = -EINVAL;
650                         goto err_ret;
651                 }
652         }
653
654         cpus_clear(covered_cpus);
655         for_each_possible_cpu(i) {
656                 pr = processors[i];
657                 if (!pr)
658                         continue;
659
660                 if (cpu_isset(i, covered_cpus))
661                         continue;
662
663                 pdomain = &(pr->performance->domain_info);
664                 cpu_set(i, pr->performance->shared_cpu_map);
665                 cpu_set(i, covered_cpus);
666                 if (pdomain->num_processors <= 1)
667                         continue;
668
669                 /* Validate the Domain info */
670                 count_target = pdomain->num_processors;
671                 count = 1;
672                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
673                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
674                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
675                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
676                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
677                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
678
679                 for_each_possible_cpu(j) {
680                         if (i == j)
681                                 continue;
682
683                         match_pr = processors[j];
684                         if (!match_pr)
685                                 continue;
686
687                         match_pdomain = &(match_pr->performance->domain_info);
688                         if (match_pdomain->domain != pdomain->domain)
689                                 continue;
690
691                         /* Here i and j are in the same domain */
692
693                         if (match_pdomain->num_processors != count_target) {
694                                 retval = -EINVAL;
695                                 goto err_ret;
696                         }
697
698                         if (pdomain->coord_type != match_pdomain->coord_type) {
699                                 retval = -EINVAL;
700                                 goto err_ret;
701                         }
702
703                         cpu_set(j, covered_cpus);
704                         cpu_set(j, pr->performance->shared_cpu_map);
705                         count++;
706                 }
707
708                 for_each_possible_cpu(j) {
709                         if (i == j)
710                                 continue;
711
712                         match_pr = processors[j];
713                         if (!match_pr)
714                                 continue;
715
716                         match_pdomain = &(match_pr->performance->domain_info);
717                         if (match_pdomain->domain != pdomain->domain)
718                                 continue;
719
720                         match_pr->performance->shared_type = 
721                                         pr->performance->shared_type;
722                         match_pr->performance->shared_cpu_map =
723                                 pr->performance->shared_cpu_map;
724                 }
725         }
726
727 err_ret:
728         for_each_possible_cpu(i) {
729                 pr = processors[i];
730                 if (!pr || !pr->performance)
731                         continue;
732
733                 /* Assume no coordination on any error parsing domain info */
734                 if (retval) {
735                         cpus_clear(pr->performance->shared_cpu_map);
736                         cpu_set(i, pr->performance->shared_cpu_map);
737                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
738                 }
739                 pr->performance = NULL; /* Will be set for real in register */
740         }
741
742         mutex_unlock(&performance_mutex);
743         return retval;
744 }
745 EXPORT_SYMBOL(acpi_processor_preregister_performance);
746
747
748 int
749 acpi_processor_register_performance(struct acpi_processor_performance
750                                     *performance, unsigned int cpu)
751 {
752         struct acpi_processor *pr;
753
754
755         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
756                 return -EINVAL;
757
758         mutex_lock(&performance_mutex);
759
760         pr = processors[cpu];
761         if (!pr) {
762                 mutex_unlock(&performance_mutex);
763                 return -ENODEV;
764         }
765
766         if (pr->performance) {
767                 mutex_unlock(&performance_mutex);
768                 return -EBUSY;
769         }
770
771         WARN_ON(!performance);
772
773         pr->performance = performance;
774
775         if (acpi_processor_get_performance_info(pr)) {
776                 pr->performance = NULL;
777                 mutex_unlock(&performance_mutex);
778                 return -EIO;
779         }
780
781         acpi_cpufreq_add_file(pr);
782
783         mutex_unlock(&performance_mutex);
784         return 0;
785 }
786
787 EXPORT_SYMBOL(acpi_processor_register_performance);
788
789 void
790 acpi_processor_unregister_performance(struct acpi_processor_performance
791                                       *performance, unsigned int cpu)
792 {
793         struct acpi_processor *pr;
794
795
796         mutex_lock(&performance_mutex);
797
798         pr = processors[cpu];
799         if (!pr) {
800                 mutex_unlock(&performance_mutex);
801                 return;
802         }
803
804         if (pr->performance)
805                 kfree(pr->performance->states);
806         pr->performance = NULL;
807
808         acpi_cpufreq_remove_file(pr);
809
810         mutex_unlock(&performance_mutex);
811
812         return;
813 }
814
815 EXPORT_SYMBOL(acpi_processor_unregister_performance);