[PATCH] ACPI: fix cpufreq regression
[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_cnt to smi_cmd if either value is zero */
356         if ((!acpi_fadt.smi_cmd) || (!acpi_fadt.pstate_cnt)) {
357                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_cnt\n"));
358                 module_put(calling_module);
359                 return 0;
360         }
361
362         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
363                           "Writing pstate_cnt [0x%x] to smi_cmd [0x%x]\n",
364                           acpi_fadt.pstate_cnt, acpi_fadt.smi_cmd));
365
366         /* FADT v1 doesn't support pstate_cnt, many BIOS vendors use
367          * it anyway, so we need to support it... */
368         if (acpi_fadt_is_v1) {
369                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
370                                   "Using v1.0 FADT reserved value for pstate_cnt\n"));
371         }
372
373         status = acpi_os_write_port(acpi_fadt.smi_cmd,
374                                     (u32) acpi_fadt.pstate_cnt, 8);
375         if (ACPI_FAILURE(status)) {
376                 ACPI_EXCEPTION((AE_INFO, status,
377                                 "Failed to write pstate_cnt [0x%x] to "
378                                 "smi_cmd [0x%x]", acpi_fadt.pstate_cnt,
379                                 acpi_fadt.smi_cmd));
380                 module_put(calling_module);
381                 return status;
382         }
383
384         /* Success. If there's no _PPC, we need to fear nothing, so
385          * we can allow the cpufreq driver to be rmmod'ed. */
386         is_done = 1;
387
388         if (!(acpi_processor_ppc_status & PPC_IN_USE))
389                 module_put(calling_module);
390
391         return 0;
392 }
393
394 EXPORT_SYMBOL(acpi_processor_notify_smm);
395
396 #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
397 /* /proc/acpi/processor/../performance interface (DEPRECATED) */
398
399 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file);
400 static struct file_operations acpi_processor_perf_fops = {
401         .open = acpi_processor_perf_open_fs,
402         .read = seq_read,
403         .llseek = seq_lseek,
404         .release = single_release,
405 };
406
407 static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset)
408 {
409         struct acpi_processor *pr = seq->private;
410         int i;
411
412
413         if (!pr)
414                 goto end;
415
416         if (!pr->performance) {
417                 seq_puts(seq, "<not supported>\n");
418                 goto end;
419         }
420
421         seq_printf(seq, "state count:             %d\n"
422                    "active state:            P%d\n",
423                    pr->performance->state_count, pr->performance->state);
424
425         seq_puts(seq, "states:\n");
426         for (i = 0; i < pr->performance->state_count; i++)
427                 seq_printf(seq,
428                            "   %cP%d:                  %d MHz, %d mW, %d uS\n",
429                            (i == pr->performance->state ? '*' : ' '), i,
430                            (u32) pr->performance->states[i].core_frequency,
431                            (u32) pr->performance->states[i].power,
432                            (u32) pr->performance->states[i].transition_latency);
433
434       end:
435         return 0;
436 }
437
438 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file)
439 {
440         return single_open(file, acpi_processor_perf_seq_show,
441                            PDE(inode)->data);
442 }
443
444 static ssize_t
445 acpi_processor_write_performance(struct file *file,
446                                  const char __user * buffer,
447                                  size_t count, loff_t * data)
448 {
449         int result = 0;
450         struct seq_file *m = file->private_data;
451         struct acpi_processor *pr = m->private;
452         struct acpi_processor_performance *perf;
453         char state_string[12] = { '\0' };
454         unsigned int new_state = 0;
455         struct cpufreq_policy policy;
456
457
458         if (!pr || (count > sizeof(state_string) - 1))
459                 return -EINVAL;
460
461         perf = pr->performance;
462         if (!perf)
463                 return -EINVAL;
464
465         if (copy_from_user(state_string, buffer, count))
466                 return -EFAULT;
467
468         state_string[count] = '\0';
469         new_state = simple_strtoul(state_string, NULL, 0);
470
471         if (new_state >= perf->state_count)
472                 return -EINVAL;
473
474         cpufreq_get_policy(&policy, pr->id);
475
476         policy.cpu = pr->id;
477         policy.min = perf->states[new_state].core_frequency * 1000;
478         policy.max = perf->states[new_state].core_frequency * 1000;
479
480         result = cpufreq_set_policy(&policy);
481         if (result)
482                 return result;
483
484         return count;
485 }
486
487 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
488 {
489         struct proc_dir_entry *entry = NULL;
490         struct acpi_device *device = NULL;
491
492
493         if (acpi_bus_get_device(pr->handle, &device))
494                 return;
495
496         /* add file 'performance' [R/W] */
497         entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
498                                   S_IFREG | S_IRUGO | S_IWUSR,
499                                   acpi_device_dir(device));
500         if (entry){
501                 acpi_processor_perf_fops.write = acpi_processor_write_performance;
502                 entry->proc_fops = &acpi_processor_perf_fops;
503                 entry->data = acpi_driver_data(device);
504                 entry->owner = THIS_MODULE;
505         }
506         return;
507 }
508
509 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
510 {
511         struct acpi_device *device = NULL;
512
513
514         if (acpi_bus_get_device(pr->handle, &device))
515                 return;
516
517         /* remove file 'performance' */
518         remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
519                           acpi_device_dir(device));
520
521         return;
522 }
523
524 #else
525 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
526 {
527         return;
528 }
529 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
530 {
531         return;
532 }
533 #endif                          /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
534
535 static int acpi_processor_get_psd(struct acpi_processor *pr)
536 {
537         int result = 0;
538         acpi_status status = AE_OK;
539         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
540         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
541         struct acpi_buffer state = {0, NULL};
542         union acpi_object  *psd = NULL;
543         struct acpi_psd_package *pdomain;
544
545         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
546         if (ACPI_FAILURE(status)) {
547                 return -ENODEV;
548         }
549
550         psd = buffer.pointer;
551         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
552                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
553                 result = -EFAULT;
554                 goto end;
555         }
556
557         if (psd->package.count != 1) {
558                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
559                 result = -EFAULT;
560                 goto end;
561         }
562
563         pdomain = &(pr->performance->domain_info);
564
565         state.length = sizeof(struct acpi_psd_package);
566         state.pointer = pdomain;
567
568         status = acpi_extract_package(&(psd->package.elements[0]),
569                 &format, &state);
570         if (ACPI_FAILURE(status)) {
571                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
572                 result = -EFAULT;
573                 goto end;
574         }
575
576         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
577                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n"));
578                 result = -EFAULT;
579                 goto end;
580         }
581
582         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
583                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n"));
584                 result = -EFAULT;
585                 goto end;
586         }
587
588 end:
589         kfree(buffer.pointer);
590         return result;
591 }
592
593 int acpi_processor_preregister_performance(
594                 struct acpi_processor_performance **performance)
595 {
596         int count, count_target;
597         int retval = 0;
598         unsigned int i, j;
599         cpumask_t covered_cpus;
600         struct acpi_processor *pr;
601         struct acpi_psd_package *pdomain;
602         struct acpi_processor *match_pr;
603         struct acpi_psd_package *match_pdomain;
604
605         mutex_lock(&performance_mutex);
606
607         retval = 0;
608
609         /* Call _PSD for all CPUs */
610         for_each_possible_cpu(i) {
611                 pr = processors[i];
612                 if (!pr) {
613                         /* Look only at processors in ACPI namespace */
614                         continue;
615                 }
616
617                 if (pr->performance) {
618                         retval = -EBUSY;
619                         continue;
620                 }
621
622                 if (!performance || !performance[i]) {
623                         retval = -EINVAL;
624                         continue;
625                 }
626
627                 pr->performance = performance[i];
628                 cpu_set(i, pr->performance->shared_cpu_map);
629                 if (acpi_processor_get_psd(pr)) {
630                         retval = -EINVAL;
631                         continue;
632                 }
633         }
634         if (retval)
635                 goto err_ret;
636
637         /*
638          * Now that we have _PSD data from all CPUs, lets setup P-state 
639          * domain info.
640          */
641         for_each_possible_cpu(i) {
642                 pr = processors[i];
643                 if (!pr)
644                         continue;
645
646                 /* Basic validity check for domain info */
647                 pdomain = &(pr->performance->domain_info);
648                 if ((pdomain->revision != ACPI_PSD_REV0_REVISION) ||
649                     (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) {
650                         retval = -EINVAL;
651                         goto err_ret;
652                 }
653                 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
654                     pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
655                     pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
656                         retval = -EINVAL;
657                         goto err_ret;
658                 }
659         }
660
661         cpus_clear(covered_cpus);
662         for_each_possible_cpu(i) {
663                 pr = processors[i];
664                 if (!pr)
665                         continue;
666
667                 if (cpu_isset(i, covered_cpus))
668                         continue;
669
670                 pdomain = &(pr->performance->domain_info);
671                 cpu_set(i, pr->performance->shared_cpu_map);
672                 cpu_set(i, covered_cpus);
673                 if (pdomain->num_processors <= 1)
674                         continue;
675
676                 /* Validate the Domain info */
677                 count_target = pdomain->num_processors;
678                 count = 1;
679                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
680                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
681                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
682                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
683                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
684                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
685
686                 for_each_possible_cpu(j) {
687                         if (i == j)
688                                 continue;
689
690                         match_pr = processors[j];
691                         if (!match_pr)
692                                 continue;
693
694                         match_pdomain = &(match_pr->performance->domain_info);
695                         if (match_pdomain->domain != pdomain->domain)
696                                 continue;
697
698                         /* Here i and j are in the same domain */
699
700                         if (match_pdomain->num_processors != count_target) {
701                                 retval = -EINVAL;
702                                 goto err_ret;
703                         }
704
705                         if (pdomain->coord_type != match_pdomain->coord_type) {
706                                 retval = -EINVAL;
707                                 goto err_ret;
708                         }
709
710                         cpu_set(j, covered_cpus);
711                         cpu_set(j, pr->performance->shared_cpu_map);
712                         count++;
713                 }
714
715                 for_each_possible_cpu(j) {
716                         if (i == j)
717                                 continue;
718
719                         match_pr = processors[j];
720                         if (!match_pr)
721                                 continue;
722
723                         match_pdomain = &(match_pr->performance->domain_info);
724                         if (match_pdomain->domain != pdomain->domain)
725                                 continue;
726
727                         match_pr->performance->shared_type = 
728                                         pr->performance->shared_type;
729                         match_pr->performance->shared_cpu_map =
730                                 pr->performance->shared_cpu_map;
731                 }
732         }
733
734 err_ret:
735         for_each_possible_cpu(i) {
736                 pr = processors[i];
737                 if (!pr || !pr->performance)
738                         continue;
739
740                 /* Assume no coordination on any error parsing domain info */
741                 if (retval) {
742                         cpus_clear(pr->performance->shared_cpu_map);
743                         cpu_set(i, pr->performance->shared_cpu_map);
744                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
745                 }
746                 pr->performance = NULL; /* Will be set for real in register */
747         }
748
749         mutex_unlock(&performance_mutex);
750         return retval;
751 }
752 EXPORT_SYMBOL(acpi_processor_preregister_performance);
753
754
755 int
756 acpi_processor_register_performance(struct acpi_processor_performance
757                                     *performance, unsigned int cpu)
758 {
759         struct acpi_processor *pr;
760
761
762         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
763                 return -EINVAL;
764
765         mutex_lock(&performance_mutex);
766
767         pr = processors[cpu];
768         if (!pr) {
769                 mutex_unlock(&performance_mutex);
770                 return -ENODEV;
771         }
772
773         if (pr->performance) {
774                 mutex_unlock(&performance_mutex);
775                 return -EBUSY;
776         }
777
778         WARN_ON(!performance);
779
780         pr->performance = performance;
781
782         if (acpi_processor_get_performance_info(pr)) {
783                 pr->performance = NULL;
784                 mutex_unlock(&performance_mutex);
785                 return -EIO;
786         }
787
788         acpi_cpufreq_add_file(pr);
789
790         mutex_unlock(&performance_mutex);
791         return 0;
792 }
793
794 EXPORT_SYMBOL(acpi_processor_register_performance);
795
796 void
797 acpi_processor_unregister_performance(struct acpi_processor_performance
798                                       *performance, unsigned int cpu)
799 {
800         struct acpi_processor *pr;
801
802
803         mutex_lock(&performance_mutex);
804
805         pr = processors[cpu];
806         if (!pr) {
807                 mutex_unlock(&performance_mutex);
808                 return;
809         }
810
811         if (pr->performance)
812                 kfree(pr->performance->states);
813         pr->performance = NULL;
814
815         acpi_cpufreq_remove_file(pr);
816
817         mutex_unlock(&performance_mutex);
818
819         return;
820 }
821
822 EXPORT_SYMBOL(acpi_processor_unregister_performance);