ACPI: change processors from array to per_cpu variable
[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_FILE_PERFORMANCE "performance"
48 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
49 ACPI_MODULE_NAME("processor_perflib");
50
51 static DEFINE_MUTEX(performance_mutex);
52
53 /* Use cpufreq debug layer for _PPC changes. */
54 #define cpufreq_printk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, \
55                                                 "cpufreq-core", msg)
56
57 /*
58  * _PPC support is implemented as a CPUfreq policy notifier:
59  * This means each time a CPUfreq driver registered also with
60  * the ACPI core is asked to change the speed policy, the maximum
61  * value is adjusted so that it is within the platform limit.
62  *
63  * Also, when a new platform limit value is detected, the CPUfreq
64  * policy is adjusted accordingly.
65  */
66
67 static unsigned int ignore_ppc = 0;
68 module_param(ignore_ppc, uint, 0644);
69 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
70                  "limited by BIOS, this should help");
71
72 #define PPC_REGISTERED   1
73 #define PPC_IN_USE       2
74
75 static int acpi_processor_ppc_status = 0;
76
77 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
78                                        unsigned long event, void *data)
79 {
80         struct cpufreq_policy *policy = data;
81         struct acpi_processor *pr;
82         unsigned int ppc = 0;
83
84         if (ignore_ppc)
85                 return 0;
86
87         mutex_lock(&performance_mutex);
88
89         if (event != CPUFREQ_INCOMPATIBLE)
90                 goto out;
91
92         pr = per_cpu(processors, policy->cpu);
93         if (!pr || !pr->performance)
94                 goto out;
95
96         ppc = (unsigned int)pr->performance_platform_limit;
97
98         if (ppc >= pr->performance->state_count)
99                 goto out;
100
101         cpufreq_verify_within_limits(policy, 0,
102                                      pr->performance->states[ppc].
103                                      core_frequency * 1000);
104
105       out:
106         mutex_unlock(&performance_mutex);
107
108         return 0;
109 }
110
111 static struct notifier_block acpi_ppc_notifier_block = {
112         .notifier_call = acpi_processor_ppc_notifier,
113 };
114
115 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
116 {
117         acpi_status status = 0;
118         unsigned long ppc = 0;
119
120
121         if (!pr)
122                 return -EINVAL;
123
124         /*
125          * _PPC indicates the maximum state currently supported by the platform
126          * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
127          */
128         status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
129
130         if (status != AE_NOT_FOUND)
131                 acpi_processor_ppc_status |= PPC_IN_USE;
132
133         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
134                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
135                 return -ENODEV;
136         }
137
138         cpufreq_printk("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
139                        (int)ppc, ppc ? "" : "not");
140
141         pr->performance_platform_limit = (int)ppc;
142
143         return 0;
144 }
145
146 int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
147 {
148         int ret;
149
150         if (ignore_ppc)
151                 return 0;
152
153         ret = acpi_processor_get_platform_limit(pr);
154
155         if (ret < 0)
156                 return (ret);
157         else
158                 return cpufreq_update_policy(pr->id);
159 }
160
161 void acpi_processor_ppc_init(void)
162 {
163         if (!cpufreq_register_notifier
164             (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
165                 acpi_processor_ppc_status |= PPC_REGISTERED;
166         else
167                 printk(KERN_DEBUG
168                        "Warning: Processor Platform Limit not supported.\n");
169 }
170
171 void acpi_processor_ppc_exit(void)
172 {
173         if (acpi_processor_ppc_status & PPC_REGISTERED)
174                 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
175                                             CPUFREQ_POLICY_NOTIFIER);
176
177         acpi_processor_ppc_status &= ~PPC_REGISTERED;
178 }
179
180 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
181 {
182         int result = 0;
183         acpi_status status = 0;
184         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
185         union acpi_object *pct = NULL;
186         union acpi_object obj = { 0 };
187
188
189         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
190         if (ACPI_FAILURE(status)) {
191                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
192                 return -ENODEV;
193         }
194
195         pct = (union acpi_object *)buffer.pointer;
196         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
197             || (pct->package.count != 2)) {
198                 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
199                 result = -EFAULT;
200                 goto end;
201         }
202
203         /*
204          * control_register
205          */
206
207         obj = pct->package.elements[0];
208
209         if ((obj.type != ACPI_TYPE_BUFFER)
210             || (obj.buffer.length < sizeof(struct acpi_pct_register))
211             || (obj.buffer.pointer == NULL)) {
212                 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
213                 result = -EFAULT;
214                 goto end;
215         }
216         memcpy(&pr->performance->control_register, obj.buffer.pointer,
217                sizeof(struct acpi_pct_register));
218
219         /*
220          * status_register
221          */
222
223         obj = pct->package.elements[1];
224
225         if ((obj.type != ACPI_TYPE_BUFFER)
226             || (obj.buffer.length < sizeof(struct acpi_pct_register))
227             || (obj.buffer.pointer == NULL)) {
228                 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
229                 result = -EFAULT;
230                 goto end;
231         }
232
233         memcpy(&pr->performance->status_register, obj.buffer.pointer,
234                sizeof(struct acpi_pct_register));
235
236       end:
237         kfree(buffer.pointer);
238
239         return result;
240 }
241
242 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
243 {
244         int result = 0;
245         acpi_status status = AE_OK;
246         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
247         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
248         struct acpi_buffer state = { 0, NULL };
249         union acpi_object *pss = NULL;
250         int i;
251
252
253         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
254         if (ACPI_FAILURE(status)) {
255                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
256                 return -ENODEV;
257         }
258
259         pss = buffer.pointer;
260         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
261                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
262                 result = -EFAULT;
263                 goto end;
264         }
265
266         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
267                           pss->package.count));
268
269         pr->performance->state_count = pss->package.count;
270         pr->performance->states =
271             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
272                     GFP_KERNEL);
273         if (!pr->performance->states) {
274                 result = -ENOMEM;
275                 goto end;
276         }
277
278         for (i = 0; i < pr->performance->state_count; i++) {
279
280                 struct acpi_processor_px *px = &(pr->performance->states[i]);
281
282                 state.length = sizeof(struct acpi_processor_px);
283                 state.pointer = px;
284
285                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
286
287                 status = acpi_extract_package(&(pss->package.elements[i]),
288                                               &format, &state);
289                 if (ACPI_FAILURE(status)) {
290                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
291                         result = -EFAULT;
292                         kfree(pr->performance->states);
293                         goto end;
294                 }
295
296                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
297                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
298                                   i,
299                                   (u32) px->core_frequency,
300                                   (u32) px->power,
301                                   (u32) px->transition_latency,
302                                   (u32) px->bus_master_latency,
303                                   (u32) px->control, (u32) px->status));
304
305                 if (!px->core_frequency) {
306                         printk(KERN_ERR PREFIX
307                                     "Invalid _PSS data: freq is zero\n");
308                         result = -EFAULT;
309                         kfree(pr->performance->states);
310                         goto end;
311                 }
312         }
313
314       end:
315         kfree(buffer.pointer);
316
317         return result;
318 }
319
320 static int acpi_processor_get_performance_info(struct acpi_processor *pr)
321 {
322         int result = 0;
323         acpi_status status = AE_OK;
324         acpi_handle handle = NULL;
325
326
327         if (!pr || !pr->performance || !pr->handle)
328                 return -EINVAL;
329
330         status = acpi_get_handle(pr->handle, "_PCT", &handle);
331         if (ACPI_FAILURE(status)) {
332                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
333                                   "ACPI-based processor performance control unavailable\n"));
334                 return -ENODEV;
335         }
336
337         result = acpi_processor_get_performance_control(pr);
338         if (result)
339                 return result;
340
341         result = acpi_processor_get_performance_states(pr);
342         if (result)
343                 return result;
344
345         return 0;
346 }
347
348 int acpi_processor_notify_smm(struct module *calling_module)
349 {
350         acpi_status status;
351         static int is_done = 0;
352
353
354         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
355                 return -EBUSY;
356
357         if (!try_module_get(calling_module))
358                 return -EINVAL;
359
360         /* is_done is set to negative if an error occured,
361          * and to postitive if _no_ error occured, but SMM
362          * was already notified. This avoids double notification
363          * which might lead to unexpected results...
364          */
365         if (is_done > 0) {
366                 module_put(calling_module);
367                 return 0;
368         } else if (is_done < 0) {
369                 module_put(calling_module);
370                 return is_done;
371         }
372
373         is_done = -EIO;
374
375         /* Can't write pstate_control to smi_command if either value is zero */
376         if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
377                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
378                 module_put(calling_module);
379                 return 0;
380         }
381
382         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
383                           "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
384                           acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
385
386         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
387                                     (u32) acpi_gbl_FADT.pstate_control, 8);
388         if (ACPI_FAILURE(status)) {
389                 ACPI_EXCEPTION((AE_INFO, status,
390                                 "Failed to write pstate_control [0x%x] to "
391                                 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
392                                 acpi_gbl_FADT.smi_command));
393                 module_put(calling_module);
394                 return status;
395         }
396
397         /* Success. If there's no _PPC, we need to fear nothing, so
398          * we can allow the cpufreq driver to be rmmod'ed. */
399         is_done = 1;
400
401         if (!(acpi_processor_ppc_status & PPC_IN_USE))
402                 module_put(calling_module);
403
404         return 0;
405 }
406
407 EXPORT_SYMBOL(acpi_processor_notify_smm);
408
409 #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
410 /* /proc/acpi/processor/../performance interface (DEPRECATED) */
411
412 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file);
413 static struct file_operations acpi_processor_perf_fops = {
414         .owner = THIS_MODULE,
415         .open = acpi_processor_perf_open_fs,
416         .read = seq_read,
417         .llseek = seq_lseek,
418         .release = single_release,
419 };
420
421 static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset)
422 {
423         struct acpi_processor *pr = seq->private;
424         int i;
425
426
427         if (!pr)
428                 goto end;
429
430         if (!pr->performance) {
431                 seq_puts(seq, "<not supported>\n");
432                 goto end;
433         }
434
435         seq_printf(seq, "state count:             %d\n"
436                    "active state:            P%d\n",
437                    pr->performance->state_count, pr->performance->state);
438
439         seq_puts(seq, "states:\n");
440         for (i = 0; i < pr->performance->state_count; i++)
441                 seq_printf(seq,
442                            "   %cP%d:                  %d MHz, %d mW, %d uS\n",
443                            (i == pr->performance->state ? '*' : ' '), i,
444                            (u32) pr->performance->states[i].core_frequency,
445                            (u32) pr->performance->states[i].power,
446                            (u32) pr->performance->states[i].transition_latency);
447
448       end:
449         return 0;
450 }
451
452 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file)
453 {
454         return single_open(file, acpi_processor_perf_seq_show,
455                            PDE(inode)->data);
456 }
457
458 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
459 {
460         struct acpi_device *device = NULL;
461
462
463         if (acpi_bus_get_device(pr->handle, &device))
464                 return;
465
466         /* add file 'performance' [R/W] */
467         proc_create_data(ACPI_PROCESSOR_FILE_PERFORMANCE, S_IFREG | S_IRUGO,
468                          acpi_device_dir(device),
469                          &acpi_processor_perf_fops, acpi_driver_data(device));
470         return;
471 }
472
473 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
474 {
475         struct acpi_device *device = NULL;
476
477
478         if (acpi_bus_get_device(pr->handle, &device))
479                 return;
480
481         /* remove file 'performance' */
482         remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
483                           acpi_device_dir(device));
484
485         return;
486 }
487
488 #else
489 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
490 {
491         return;
492 }
493 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
494 {
495         return;
496 }
497 #endif                          /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
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                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
517                 result = -EFAULT;
518                 goto end;
519         }
520
521         if (psd->package.count != 1) {
522                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "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                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
536                 result = -EFAULT;
537                 goto end;
538         }
539
540         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
541                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n"));
542                 result = -EFAULT;
543                 goto end;
544         }
545
546         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
547                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n"));
548                 result = -EFAULT;
549                 goto end;
550         }
551
552 end:
553         kfree(buffer.pointer);
554         return result;
555 }
556
557 int acpi_processor_preregister_performance(
558                 struct acpi_processor_performance *performance)
559 {
560         int count, count_target;
561         int retval = 0;
562         unsigned int i, j;
563         cpumask_t covered_cpus;
564         struct acpi_processor *pr;
565         struct acpi_psd_package *pdomain;
566         struct acpi_processor *match_pr;
567         struct acpi_psd_package *match_pdomain;
568
569         mutex_lock(&performance_mutex);
570
571         retval = 0;
572
573         /* Call _PSD for all CPUs */
574         for_each_possible_cpu(i) {
575                 pr = per_cpu(processors, i);
576                 if (!pr) {
577                         /* Look only at processors in ACPI namespace */
578                         continue;
579                 }
580
581                 if (pr->performance) {
582                         retval = -EBUSY;
583                         continue;
584                 }
585
586                 if (!performance || !percpu_ptr(performance, i)) {
587                         retval = -EINVAL;
588                         continue;
589                 }
590
591                 pr->performance = percpu_ptr(performance, i);
592                 cpu_set(i, pr->performance->shared_cpu_map);
593                 if (acpi_processor_get_psd(pr)) {
594                         retval = -EINVAL;
595                         continue;
596                 }
597         }
598         if (retval)
599                 goto err_ret;
600
601         /*
602          * Now that we have _PSD data from all CPUs, lets setup P-state 
603          * domain info.
604          */
605         for_each_possible_cpu(i) {
606                 pr = per_cpu(processors, i);
607                 if (!pr)
608                         continue;
609
610                 /* Basic validity check for domain info */
611                 pdomain = &(pr->performance->domain_info);
612                 if ((pdomain->revision != ACPI_PSD_REV0_REVISION) ||
613                     (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) {
614                         retval = -EINVAL;
615                         goto err_ret;
616                 }
617                 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
618                     pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
619                     pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
620                         retval = -EINVAL;
621                         goto err_ret;
622                 }
623         }
624
625         cpus_clear(covered_cpus);
626         for_each_possible_cpu(i) {
627                 pr = per_cpu(processors, i);
628                 if (!pr)
629                         continue;
630
631                 if (cpu_isset(i, covered_cpus))
632                         continue;
633
634                 pdomain = &(pr->performance->domain_info);
635                 cpu_set(i, pr->performance->shared_cpu_map);
636                 cpu_set(i, covered_cpus);
637                 if (pdomain->num_processors <= 1)
638                         continue;
639
640                 /* Validate the Domain info */
641                 count_target = pdomain->num_processors;
642                 count = 1;
643                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
644                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
645                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
646                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
647                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
648                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
649
650                 for_each_possible_cpu(j) {
651                         if (i == j)
652                                 continue;
653
654                         match_pr = per_cpu(processors, j);
655                         if (!match_pr)
656                                 continue;
657
658                         match_pdomain = &(match_pr->performance->domain_info);
659                         if (match_pdomain->domain != pdomain->domain)
660                                 continue;
661
662                         /* Here i and j are in the same domain */
663
664                         if (match_pdomain->num_processors != count_target) {
665                                 retval = -EINVAL;
666                                 goto err_ret;
667                         }
668
669                         if (pdomain->coord_type != match_pdomain->coord_type) {
670                                 retval = -EINVAL;
671                                 goto err_ret;
672                         }
673
674                         cpu_set(j, covered_cpus);
675                         cpu_set(j, pr->performance->shared_cpu_map);
676                         count++;
677                 }
678
679                 for_each_possible_cpu(j) {
680                         if (i == j)
681                                 continue;
682
683                         match_pr = per_cpu(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                         match_pr->performance->shared_type = 
692                                         pr->performance->shared_type;
693                         match_pr->performance->shared_cpu_map =
694                                 pr->performance->shared_cpu_map;
695                 }
696         }
697
698 err_ret:
699         for_each_possible_cpu(i) {
700                 pr = per_cpu(processors, i);
701                 if (!pr || !pr->performance)
702                         continue;
703
704                 /* Assume no coordination on any error parsing domain info */
705                 if (retval) {
706                         cpus_clear(pr->performance->shared_cpu_map);
707                         cpu_set(i, pr->performance->shared_cpu_map);
708                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
709                 }
710                 pr->performance = NULL; /* Will be set for real in register */
711         }
712
713         mutex_unlock(&performance_mutex);
714         return retval;
715 }
716 EXPORT_SYMBOL(acpi_processor_preregister_performance);
717
718
719 int
720 acpi_processor_register_performance(struct acpi_processor_performance
721                                     *performance, unsigned int cpu)
722 {
723         struct acpi_processor *pr;
724
725
726         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
727                 return -EINVAL;
728
729         mutex_lock(&performance_mutex);
730
731         pr = per_cpu(processors, cpu);
732         if (!pr) {
733                 mutex_unlock(&performance_mutex);
734                 return -ENODEV;
735         }
736
737         if (pr->performance) {
738                 mutex_unlock(&performance_mutex);
739                 return -EBUSY;
740         }
741
742         WARN_ON(!performance);
743
744         pr->performance = performance;
745
746         if (acpi_processor_get_performance_info(pr)) {
747                 pr->performance = NULL;
748                 mutex_unlock(&performance_mutex);
749                 return -EIO;
750         }
751
752         acpi_cpufreq_add_file(pr);
753
754         mutex_unlock(&performance_mutex);
755         return 0;
756 }
757
758 EXPORT_SYMBOL(acpi_processor_register_performance);
759
760 void
761 acpi_processor_unregister_performance(struct acpi_processor_performance
762                                       *performance, unsigned int cpu)
763 {
764         struct acpi_processor *pr;
765
766
767         mutex_lock(&performance_mutex);
768
769         pr = per_cpu(processors, cpu);
770         if (!pr) {
771                 mutex_unlock(&performance_mutex);
772                 return;
773         }
774
775         if (pr->performance)
776                 kfree(pr->performance->states);
777         pr->performance = NULL;
778
779         acpi_cpufreq_remove_file(pr);
780
781         mutex_unlock(&performance_mutex);
782
783         return;
784 }
785
786 EXPORT_SYMBOL(acpi_processor_unregister_performance);