Merge branch '3.4-rc1' into android-tegra-nv-3.3-rebased
[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 /*
244  * Do a quick check if the systems looks like it should use ACPI
245  * cpufreq. We look at a _PCT method being available, but don't
246  * do a whole lot of sanity checks.
247  */
248 void acpi_processor_load_module(struct acpi_processor *pr)
249 {
250         static int requested;
251         acpi_status status = 0;
252         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
253
254         if (!arch_has_acpi_pdc() || requested)
255                 return;
256         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
257         if (!ACPI_FAILURE(status)) {
258                 printk(KERN_INFO PREFIX "Requesting acpi_cpufreq\n");
259                 request_module_nowait("acpi_cpufreq");
260                 requested = 1;
261         }
262         kfree(buffer.pointer);
263 }
264
265 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
266 {
267         int result = 0;
268         acpi_status status = 0;
269         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
270         union acpi_object *pct = NULL;
271         union acpi_object obj = { 0 };
272
273
274         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
275         if (ACPI_FAILURE(status)) {
276                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
277                 return -ENODEV;
278         }
279
280         pct = (union acpi_object *)buffer.pointer;
281         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
282             || (pct->package.count != 2)) {
283                 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
284                 result = -EFAULT;
285                 goto end;
286         }
287
288         /*
289          * control_register
290          */
291
292         obj = pct->package.elements[0];
293
294         if ((obj.type != ACPI_TYPE_BUFFER)
295             || (obj.buffer.length < sizeof(struct acpi_pct_register))
296             || (obj.buffer.pointer == NULL)) {
297                 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
298                 result = -EFAULT;
299                 goto end;
300         }
301         memcpy(&pr->performance->control_register, obj.buffer.pointer,
302                sizeof(struct acpi_pct_register));
303
304         /*
305          * status_register
306          */
307
308         obj = pct->package.elements[1];
309
310         if ((obj.type != ACPI_TYPE_BUFFER)
311             || (obj.buffer.length < sizeof(struct acpi_pct_register))
312             || (obj.buffer.pointer == NULL)) {
313                 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
314                 result = -EFAULT;
315                 goto end;
316         }
317
318         memcpy(&pr->performance->status_register, obj.buffer.pointer,
319                sizeof(struct acpi_pct_register));
320
321       end:
322         kfree(buffer.pointer);
323
324         return result;
325 }
326
327 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
328 {
329         int result = 0;
330         acpi_status status = AE_OK;
331         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
332         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
333         struct acpi_buffer state = { 0, NULL };
334         union acpi_object *pss = NULL;
335         int i;
336
337
338         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
339         if (ACPI_FAILURE(status)) {
340                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
341                 return -ENODEV;
342         }
343
344         pss = buffer.pointer;
345         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
346                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
347                 result = -EFAULT;
348                 goto end;
349         }
350
351         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
352                           pss->package.count));
353
354         pr->performance->state_count = pss->package.count;
355         pr->performance->states =
356             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
357                     GFP_KERNEL);
358         if (!pr->performance->states) {
359                 result = -ENOMEM;
360                 goto end;
361         }
362
363         for (i = 0; i < pr->performance->state_count; i++) {
364
365                 struct acpi_processor_px *px = &(pr->performance->states[i]);
366
367                 state.length = sizeof(struct acpi_processor_px);
368                 state.pointer = px;
369
370                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
371
372                 status = acpi_extract_package(&(pss->package.elements[i]),
373                                               &format, &state);
374                 if (ACPI_FAILURE(status)) {
375                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
376                         result = -EFAULT;
377                         kfree(pr->performance->states);
378                         goto end;
379                 }
380
381                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
382                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
383                                   i,
384                                   (u32) px->core_frequency,
385                                   (u32) px->power,
386                                   (u32) px->transition_latency,
387                                   (u32) px->bus_master_latency,
388                                   (u32) px->control, (u32) px->status));
389
390                 /*
391                  * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
392                  */
393                 if (!px->core_frequency ||
394                     ((u32)(px->core_frequency * 1000) !=
395                      (px->core_frequency * 1000))) {
396                         printk(KERN_ERR FW_BUG PREFIX
397                                "Invalid BIOS _PSS frequency: 0x%llx MHz\n",
398                                px->core_frequency);
399                         result = -EFAULT;
400                         kfree(pr->performance->states);
401                         goto end;
402                 }
403         }
404
405       end:
406         kfree(buffer.pointer);
407
408         return result;
409 }
410
411 static int acpi_processor_get_performance_info(struct acpi_processor *pr)
412 {
413         int result = 0;
414         acpi_status status = AE_OK;
415         acpi_handle handle = NULL;
416
417         if (!pr || !pr->performance || !pr->handle)
418                 return -EINVAL;
419
420         status = acpi_get_handle(pr->handle, "_PCT", &handle);
421         if (ACPI_FAILURE(status)) {
422                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
423                                   "ACPI-based processor performance control unavailable\n"));
424                 return -ENODEV;
425         }
426
427         result = acpi_processor_get_performance_control(pr);
428         if (result)
429                 goto update_bios;
430
431         result = acpi_processor_get_performance_states(pr);
432         if (result)
433                 goto update_bios;
434
435         /* We need to call _PPC once when cpufreq starts */
436         if (ignore_ppc != 1)
437                 result = acpi_processor_get_platform_limit(pr);
438
439         return result;
440
441         /*
442          * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
443          * the BIOS is older than the CPU and does not know its frequencies
444          */
445  update_bios:
446 #ifdef CONFIG_X86
447         if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){
448                 if(boot_cpu_has(X86_FEATURE_EST))
449                         printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
450                                "frequency support\n");
451         }
452 #endif
453         return result;
454 }
455
456 int acpi_processor_notify_smm(struct module *calling_module)
457 {
458         acpi_status status;
459         static int is_done = 0;
460
461
462         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
463                 return -EBUSY;
464
465         if (!try_module_get(calling_module))
466                 return -EINVAL;
467
468         /* is_done is set to negative if an error occurred,
469          * and to postitive if _no_ error occurred, but SMM
470          * was already notified. This avoids double notification
471          * which might lead to unexpected results...
472          */
473         if (is_done > 0) {
474                 module_put(calling_module);
475                 return 0;
476         } else if (is_done < 0) {
477                 module_put(calling_module);
478                 return is_done;
479         }
480
481         is_done = -EIO;
482
483         /* Can't write pstate_control to smi_command if either value is zero */
484         if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
485                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
486                 module_put(calling_module);
487                 return 0;
488         }
489
490         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
491                           "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
492                           acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
493
494         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
495                                     (u32) acpi_gbl_FADT.pstate_control, 8);
496         if (ACPI_FAILURE(status)) {
497                 ACPI_EXCEPTION((AE_INFO, status,
498                                 "Failed to write pstate_control [0x%x] to "
499                                 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
500                                 acpi_gbl_FADT.smi_command));
501                 module_put(calling_module);
502                 return status;
503         }
504
505         /* Success. If there's no _PPC, we need to fear nothing, so
506          * we can allow the cpufreq driver to be rmmod'ed. */
507         is_done = 1;
508
509         if (!(acpi_processor_ppc_status & PPC_IN_USE))
510                 module_put(calling_module);
511
512         return 0;
513 }
514
515 EXPORT_SYMBOL(acpi_processor_notify_smm);
516
517 static int acpi_processor_get_psd(struct acpi_processor *pr)
518 {
519         int result = 0;
520         acpi_status status = AE_OK;
521         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
522         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
523         struct acpi_buffer state = {0, NULL};
524         union acpi_object  *psd = NULL;
525         struct acpi_psd_package *pdomain;
526
527         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
528         if (ACPI_FAILURE(status)) {
529                 return -ENODEV;
530         }
531
532         psd = buffer.pointer;
533         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
534                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
535                 result = -EFAULT;
536                 goto end;
537         }
538
539         if (psd->package.count != 1) {
540                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
541                 result = -EFAULT;
542                 goto end;
543         }
544
545         pdomain = &(pr->performance->domain_info);
546
547         state.length = sizeof(struct acpi_psd_package);
548         state.pointer = pdomain;
549
550         status = acpi_extract_package(&(psd->package.elements[0]),
551                 &format, &state);
552         if (ACPI_FAILURE(status)) {
553                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
554                 result = -EFAULT;
555                 goto end;
556         }
557
558         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
559                 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
560                 result = -EFAULT;
561                 goto end;
562         }
563
564         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
565                 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
566                 result = -EFAULT;
567                 goto end;
568         }
569
570         if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
571             pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
572             pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
573                 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
574                 result = -EFAULT;
575                 goto end;
576         }
577 end:
578         kfree(buffer.pointer);
579         return result;
580 }
581
582 int acpi_processor_preregister_performance(
583                 struct acpi_processor_performance __percpu *performance)
584 {
585         int count, count_target;
586         int retval = 0;
587         unsigned int i, j;
588         cpumask_var_t covered_cpus;
589         struct acpi_processor *pr;
590         struct acpi_psd_package *pdomain;
591         struct acpi_processor *match_pr;
592         struct acpi_psd_package *match_pdomain;
593
594         if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
595                 return -ENOMEM;
596
597         mutex_lock(&performance_mutex);
598
599         /*
600          * Check if another driver has already registered, and abort before
601          * changing pr->performance if it has. Check input data as well.
602          */
603         for_each_possible_cpu(i) {
604                 pr = per_cpu(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                         goto err_out;
613                 }
614
615                 if (!performance || !per_cpu_ptr(performance, i)) {
616                         retval = -EINVAL;
617                         goto err_out;
618                 }
619         }
620
621         /* Call _PSD for all CPUs */
622         for_each_possible_cpu(i) {
623                 pr = per_cpu(processors, i);
624                 if (!pr)
625                         continue;
626
627                 pr->performance = per_cpu_ptr(performance, i);
628                 cpumask_set_cpu(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 = per_cpu(processors, i);
643                 if (!pr)
644                         continue;
645
646                 if (cpumask_test_cpu(i, covered_cpus))
647                         continue;
648
649                 pdomain = &(pr->performance->domain_info);
650                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
651                 cpumask_set_cpu(i, covered_cpus);
652                 if (pdomain->num_processors <= 1)
653                         continue;
654
655                 /* Validate the Domain info */
656                 count_target = pdomain->num_processors;
657                 count = 1;
658                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
659                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
660                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
661                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
662                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
663                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
664
665                 for_each_possible_cpu(j) {
666                         if (i == j)
667                                 continue;
668
669                         match_pr = per_cpu(processors, j);
670                         if (!match_pr)
671                                 continue;
672
673                         match_pdomain = &(match_pr->performance->domain_info);
674                         if (match_pdomain->domain != pdomain->domain)
675                                 continue;
676
677                         /* Here i and j are in the same domain */
678
679                         if (match_pdomain->num_processors != count_target) {
680                                 retval = -EINVAL;
681                                 goto err_ret;
682                         }
683
684                         if (pdomain->coord_type != match_pdomain->coord_type) {
685                                 retval = -EINVAL;
686                                 goto err_ret;
687                         }
688
689                         cpumask_set_cpu(j, covered_cpus);
690                         cpumask_set_cpu(j, pr->performance->shared_cpu_map);
691                         count++;
692                 }
693
694                 for_each_possible_cpu(j) {
695                         if (i == j)
696                                 continue;
697
698                         match_pr = per_cpu(processors, j);
699                         if (!match_pr)
700                                 continue;
701
702                         match_pdomain = &(match_pr->performance->domain_info);
703                         if (match_pdomain->domain != pdomain->domain)
704                                 continue;
705
706                         match_pr->performance->shared_type = 
707                                         pr->performance->shared_type;
708                         cpumask_copy(match_pr->performance->shared_cpu_map,
709                                      pr->performance->shared_cpu_map);
710                 }
711         }
712
713 err_ret:
714         for_each_possible_cpu(i) {
715                 pr = per_cpu(processors, i);
716                 if (!pr || !pr->performance)
717                         continue;
718
719                 /* Assume no coordination on any error parsing domain info */
720                 if (retval) {
721                         cpumask_clear(pr->performance->shared_cpu_map);
722                         cpumask_set_cpu(i, pr->performance->shared_cpu_map);
723                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
724                 }
725                 pr->performance = NULL; /* Will be set for real in register */
726         }
727
728 err_out:
729         mutex_unlock(&performance_mutex);
730         free_cpumask_var(covered_cpus);
731         return retval;
732 }
733 EXPORT_SYMBOL(acpi_processor_preregister_performance);
734
735 int
736 acpi_processor_register_performance(struct acpi_processor_performance
737                                     *performance, unsigned int cpu)
738 {
739         struct acpi_processor *pr;
740
741         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
742                 return -EINVAL;
743
744         mutex_lock(&performance_mutex);
745
746         pr = per_cpu(processors, cpu);
747         if (!pr) {
748                 mutex_unlock(&performance_mutex);
749                 return -ENODEV;
750         }
751
752         if (pr->performance) {
753                 mutex_unlock(&performance_mutex);
754                 return -EBUSY;
755         }
756
757         WARN_ON(!performance);
758
759         pr->performance = performance;
760
761         if (acpi_processor_get_performance_info(pr)) {
762                 pr->performance = NULL;
763                 mutex_unlock(&performance_mutex);
764                 return -EIO;
765         }
766
767         mutex_unlock(&performance_mutex);
768         return 0;
769 }
770
771 EXPORT_SYMBOL(acpi_processor_register_performance);
772
773 void
774 acpi_processor_unregister_performance(struct acpi_processor_performance
775                                       *performance, unsigned int cpu)
776 {
777         struct acpi_processor *pr;
778
779         mutex_lock(&performance_mutex);
780
781         pr = per_cpu(processors, cpu);
782         if (!pr) {
783                 mutex_unlock(&performance_mutex);
784                 return;
785         }
786
787         if (pr->performance)
788                 kfree(pr->performance->states);
789         pr->performance = NULL;
790
791         mutex_unlock(&performance_mutex);
792
793         return;
794 }
795
796 EXPORT_SYMBOL(acpi_processor_unregister_performance);