Merge tag 'dma-mapping-4.17-2' of git://git.infradead.org/users/hch/dma-mapping
[muen/linux.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  */
24
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/init.h>
28 #include <linux/cpufreq.h>
29 #include <linux/slab.h>
30 #include <linux/acpi.h>
31 #include <acpi/processor.h>
32 #ifdef CONFIG_X86
33 #include <asm/cpufeature.h>
34 #endif
35
36 #define PREFIX "ACPI: "
37
38 #define ACPI_PROCESSOR_CLASS            "processor"
39 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
40 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
41 ACPI_MODULE_NAME("processor_perflib");
42
43 static DEFINE_MUTEX(performance_mutex);
44
45 /*
46  * _PPC support is implemented as a CPUfreq policy notifier:
47  * This means each time a CPUfreq driver registered also with
48  * the ACPI core is asked to change the speed policy, the maximum
49  * value is adjusted so that it is within the platform limit.
50  *
51  * Also, when a new platform limit value is detected, the CPUfreq
52  * policy is adjusted accordingly.
53  */
54
55 /* ignore_ppc:
56  * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
57  *       ignore _PPC
58  *  0 -> cpufreq low level drivers initialized -> consider _PPC values
59  *  1 -> ignore _PPC totally -> forced by user through boot param
60  */
61 static int ignore_ppc = -1;
62 module_param(ignore_ppc, int, 0644);
63 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
64                  "limited by BIOS, this should help");
65
66 #define PPC_REGISTERED   1
67 #define PPC_IN_USE       2
68
69 static int acpi_processor_ppc_status;
70
71 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
72                                        unsigned long event, void *data)
73 {
74         struct cpufreq_policy *policy = data;
75         struct acpi_processor *pr;
76         unsigned int ppc = 0;
77
78         if (ignore_ppc < 0)
79                 ignore_ppc = 0;
80
81         if (ignore_ppc)
82                 return 0;
83
84         if (event != CPUFREQ_ADJUST)
85                 return 0;
86
87         mutex_lock(&performance_mutex);
88
89         pr = per_cpu(processors, policy->cpu);
90         if (!pr || !pr->performance)
91                 goto out;
92
93         ppc = (unsigned int)pr->performance_platform_limit;
94
95         if (ppc >= pr->performance->state_count)
96                 goto out;
97
98         cpufreq_verify_within_limits(policy, 0,
99                                      pr->performance->states[ppc].
100                                      core_frequency * 1000);
101
102       out:
103         mutex_unlock(&performance_mutex);
104
105         return 0;
106 }
107
108 static struct notifier_block acpi_ppc_notifier_block = {
109         .notifier_call = acpi_processor_ppc_notifier,
110 };
111
112 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
113 {
114         acpi_status status = 0;
115         unsigned long long ppc = 0;
116
117
118         if (!pr)
119                 return -EINVAL;
120
121         /*
122          * _PPC indicates the maximum state currently supported by the platform
123          * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
124          */
125         status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
126
127         if (status != AE_NOT_FOUND)
128                 acpi_processor_ppc_status |= PPC_IN_USE;
129
130         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
131                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
132                 return -ENODEV;
133         }
134
135         pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
136                        (int)ppc, ppc ? "" : "not");
137
138         pr->performance_platform_limit = (int)ppc;
139
140         return 0;
141 }
142
143 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE       0x80
144 /*
145  * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
146  * @handle: ACPI processor handle
147  * @status: the status code of _PPC evaluation
148  *      0: success. OSPM is now using the performance state specificed.
149  *      1: failure. OSPM has not changed the number of P-states in use
150  */
151 static void acpi_processor_ppc_ost(acpi_handle handle, int status)
152 {
153         if (acpi_has_method(handle, "_OST"))
154                 acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
155                                   status, NULL);
156 }
157
158 void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
159 {
160         int ret;
161
162         if (ignore_ppc || !pr->performance) {
163                 /*
164                  * Only when it is notification event, the _OST object
165                  * will be evaluated. Otherwise it is skipped.
166                  */
167                 if (event_flag)
168                         acpi_processor_ppc_ost(pr->handle, 1);
169                 return;
170         }
171
172         ret = acpi_processor_get_platform_limit(pr);
173         /*
174          * Only when it is notification event, the _OST object
175          * will be evaluated. Otherwise it is skipped.
176          */
177         if (event_flag) {
178                 if (ret < 0)
179                         acpi_processor_ppc_ost(pr->handle, 1);
180                 else
181                         acpi_processor_ppc_ost(pr->handle, 0);
182         }
183         if (ret >= 0)
184                 cpufreq_update_policy(pr->id);
185 }
186
187 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
188 {
189         struct acpi_processor *pr;
190
191         pr = per_cpu(processors, cpu);
192         if (!pr || !pr->performance || !pr->performance->state_count)
193                 return -ENODEV;
194         *limit = pr->performance->states[pr->performance_platform_limit].
195                 core_frequency * 1000;
196         return 0;
197 }
198 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
199
200 void acpi_processor_ppc_init(void)
201 {
202         if (!cpufreq_register_notifier
203             (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
204                 acpi_processor_ppc_status |= PPC_REGISTERED;
205         else
206                 printk(KERN_DEBUG
207                        "Warning: Processor Platform Limit not supported.\n");
208 }
209
210 void acpi_processor_ppc_exit(void)
211 {
212         if (acpi_processor_ppc_status & PPC_REGISTERED)
213                 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
214                                             CPUFREQ_POLICY_NOTIFIER);
215
216         acpi_processor_ppc_status &= ~PPC_REGISTERED;
217 }
218
219 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
220 {
221         int result = 0;
222         acpi_status status = 0;
223         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
224         union acpi_object *pct = NULL;
225         union acpi_object obj = { 0 };
226
227
228         status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
229         if (ACPI_FAILURE(status)) {
230                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
231                 return -ENODEV;
232         }
233
234         pct = (union acpi_object *)buffer.pointer;
235         if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
236             || (pct->package.count != 2)) {
237                 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
238                 result = -EFAULT;
239                 goto end;
240         }
241
242         /*
243          * control_register
244          */
245
246         obj = pct->package.elements[0];
247
248         if ((obj.type != ACPI_TYPE_BUFFER)
249             || (obj.buffer.length < sizeof(struct acpi_pct_register))
250             || (obj.buffer.pointer == NULL)) {
251                 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
252                 result = -EFAULT;
253                 goto end;
254         }
255         memcpy(&pr->performance->control_register, obj.buffer.pointer,
256                sizeof(struct acpi_pct_register));
257
258         /*
259          * status_register
260          */
261
262         obj = pct->package.elements[1];
263
264         if ((obj.type != ACPI_TYPE_BUFFER)
265             || (obj.buffer.length < sizeof(struct acpi_pct_register))
266             || (obj.buffer.pointer == NULL)) {
267                 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
268                 result = -EFAULT;
269                 goto end;
270         }
271
272         memcpy(&pr->performance->status_register, obj.buffer.pointer,
273                sizeof(struct acpi_pct_register));
274
275       end:
276         kfree(buffer.pointer);
277
278         return result;
279 }
280
281 #ifdef CONFIG_X86
282 /*
283  * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
284  * in their ACPI data. Calculate the real values and fix up the _PSS data.
285  */
286 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
287 {
288         u32 hi, lo, fid, did;
289         int index = px->control & 0x00000007;
290
291         if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
292                 return;
293
294         if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
295             || boot_cpu_data.x86 == 0x11) {
296                 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
297                 /*
298                  * MSR C001_0064+:
299                  * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
300                  */
301                 if (!(hi & BIT(31)))
302                         return;
303
304                 fid = lo & 0x3f;
305                 did = (lo >> 6) & 7;
306                 if (boot_cpu_data.x86 == 0x10)
307                         px->core_frequency = (100 * (fid + 0x10)) >> did;
308                 else
309                         px->core_frequency = (100 * (fid + 8)) >> did;
310         }
311 }
312 #else
313 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
314 #endif
315
316 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
317 {
318         int result = 0;
319         acpi_status status = AE_OK;
320         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
321         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
322         struct acpi_buffer state = { 0, NULL };
323         union acpi_object *pss = NULL;
324         int i;
325         int last_invalid = -1;
326
327
328         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
329         if (ACPI_FAILURE(status)) {
330                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
331                 return -ENODEV;
332         }
333
334         pss = buffer.pointer;
335         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
336                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
337                 result = -EFAULT;
338                 goto end;
339         }
340
341         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
342                           pss->package.count));
343
344         pr->performance->state_count = pss->package.count;
345         pr->performance->states =
346             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
347                     GFP_KERNEL);
348         if (!pr->performance->states) {
349                 result = -ENOMEM;
350                 goto end;
351         }
352
353         for (i = 0; i < pr->performance->state_count; i++) {
354
355                 struct acpi_processor_px *px = &(pr->performance->states[i]);
356
357                 state.length = sizeof(struct acpi_processor_px);
358                 state.pointer = px;
359
360                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
361
362                 status = acpi_extract_package(&(pss->package.elements[i]),
363                                               &format, &state);
364                 if (ACPI_FAILURE(status)) {
365                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
366                         result = -EFAULT;
367                         kfree(pr->performance->states);
368                         goto end;
369                 }
370
371                 amd_fixup_frequency(px, i);
372
373                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
374                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
375                                   i,
376                                   (u32) px->core_frequency,
377                                   (u32) px->power,
378                                   (u32) px->transition_latency,
379                                   (u32) px->bus_master_latency,
380                                   (u32) px->control, (u32) px->status));
381
382                 /*
383                  * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
384                  */
385                 if (!px->core_frequency ||
386                     ((u32)(px->core_frequency * 1000) !=
387                      (px->core_frequency * 1000))) {
388                         printk(KERN_ERR FW_BUG PREFIX
389                                "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
390                                pr->id, px->core_frequency);
391                         if (last_invalid == -1)
392                                 last_invalid = i;
393                 } else {
394                         if (last_invalid != -1) {
395                                 /*
396                                  * Copy this valid entry over last_invalid entry
397                                  */
398                                 memcpy(&(pr->performance->states[last_invalid]),
399                                        px, sizeof(struct acpi_processor_px));
400                                 ++last_invalid;
401                         }
402                 }
403         }
404
405         if (last_invalid == 0) {
406                 printk(KERN_ERR FW_BUG PREFIX
407                        "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
408                 result = -EFAULT;
409                 kfree(pr->performance->states);
410                 pr->performance->states = NULL;
411         }
412
413         if (last_invalid > 0)
414                 pr->performance->state_count = last_invalid;
415
416       end:
417         kfree(buffer.pointer);
418
419         return result;
420 }
421
422 int acpi_processor_get_performance_info(struct acpi_processor *pr)
423 {
424         int result = 0;
425
426         if (!pr || !pr->performance || !pr->handle)
427                 return -EINVAL;
428
429         if (!acpi_has_method(pr->handle, "_PCT")) {
430                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
431                                   "ACPI-based processor performance control unavailable\n"));
432                 return -ENODEV;
433         }
434
435         result = acpi_processor_get_performance_control(pr);
436         if (result)
437                 goto update_bios;
438
439         result = acpi_processor_get_performance_states(pr);
440         if (result)
441                 goto update_bios;
442
443         /* We need to call _PPC once when cpufreq starts */
444         if (ignore_ppc != 1)
445                 result = acpi_processor_get_platform_limit(pr);
446
447         return result;
448
449         /*
450          * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
451          * the BIOS is older than the CPU and does not know its frequencies
452          */
453  update_bios:
454 #ifdef CONFIG_X86
455         if (acpi_has_method(pr->handle, "_PPC")) {
456                 if(boot_cpu_has(X86_FEATURE_EST))
457                         printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
458                                "frequency support\n");
459         }
460 #endif
461         return result;
462 }
463 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
464
465 int acpi_processor_pstate_control(void)
466 {
467         acpi_status status;
468
469         if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
470                 return 0;
471
472         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
473                           "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
474                           acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
475
476         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
477                                     (u32)acpi_gbl_FADT.pstate_control, 8);
478         if (ACPI_SUCCESS(status))
479                 return 1;
480
481         ACPI_EXCEPTION((AE_INFO, status,
482                         "Failed to write pstate_control [0x%x] to smi_command [0x%x]",
483                         acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
484         return -EIO;
485 }
486
487 int acpi_processor_notify_smm(struct module *calling_module)
488 {
489         static int is_done = 0;
490         int result;
491
492         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
493                 return -EBUSY;
494
495         if (!try_module_get(calling_module))
496                 return -EINVAL;
497
498         /* is_done is set to negative if an error occurred,
499          * and to postitive if _no_ error occurred, but SMM
500          * was already notified. This avoids double notification
501          * which might lead to unexpected results...
502          */
503         if (is_done > 0) {
504                 module_put(calling_module);
505                 return 0;
506         } else if (is_done < 0) {
507                 module_put(calling_module);
508                 return is_done;
509         }
510
511         is_done = -EIO;
512
513         result = acpi_processor_pstate_control();
514         if (!result) {
515                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
516                 module_put(calling_module);
517                 return 0;
518         }
519         if (result < 0) {
520                 module_put(calling_module);
521                 return result;
522         }
523
524         /* Success. If there's no _PPC, we need to fear nothing, so
525          * we can allow the cpufreq driver to be rmmod'ed. */
526         is_done = 1;
527
528         if (!(acpi_processor_ppc_status & PPC_IN_USE))
529                 module_put(calling_module);
530
531         return 0;
532 }
533
534 EXPORT_SYMBOL(acpi_processor_notify_smm);
535
536 static int acpi_processor_get_psd(struct acpi_processor *pr)
537 {
538         int result = 0;
539         acpi_status status = AE_OK;
540         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
541         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
542         struct acpi_buffer state = {0, NULL};
543         union acpi_object  *psd = NULL;
544         struct acpi_psd_package *pdomain;
545
546         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
547         if (ACPI_FAILURE(status)) {
548                 return -ENODEV;
549         }
550
551         psd = buffer.pointer;
552         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
553                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
554                 result = -EFAULT;
555                 goto end;
556         }
557
558         if (psd->package.count != 1) {
559                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
560                 result = -EFAULT;
561                 goto end;
562         }
563
564         pdomain = &(pr->performance->domain_info);
565
566         state.length = sizeof(struct acpi_psd_package);
567         state.pointer = pdomain;
568
569         status = acpi_extract_package(&(psd->package.elements[0]),
570                 &format, &state);
571         if (ACPI_FAILURE(status)) {
572                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
573                 result = -EFAULT;
574                 goto end;
575         }
576
577         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
578                 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
579                 result = -EFAULT;
580                 goto end;
581         }
582
583         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
584                 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
585                 result = -EFAULT;
586                 goto end;
587         }
588
589         if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
590             pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
591             pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
592                 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
593                 result = -EFAULT;
594                 goto end;
595         }
596 end:
597         kfree(buffer.pointer);
598         return result;
599 }
600
601 int acpi_processor_preregister_performance(
602                 struct acpi_processor_performance __percpu *performance)
603 {
604         int count_target;
605         int retval = 0;
606         unsigned int i, j;
607         cpumask_var_t covered_cpus;
608         struct acpi_processor *pr;
609         struct acpi_psd_package *pdomain;
610         struct acpi_processor *match_pr;
611         struct acpi_psd_package *match_pdomain;
612
613         if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
614                 return -ENOMEM;
615
616         mutex_lock(&performance_mutex);
617
618         /*
619          * Check if another driver has already registered, and abort before
620          * changing pr->performance if it has. Check input data as well.
621          */
622         for_each_possible_cpu(i) {
623                 pr = per_cpu(processors, i);
624                 if (!pr) {
625                         /* Look only at processors in ACPI namespace */
626                         continue;
627                 }
628
629                 if (pr->performance) {
630                         retval = -EBUSY;
631                         goto err_out;
632                 }
633
634                 if (!performance || !per_cpu_ptr(performance, i)) {
635                         retval = -EINVAL;
636                         goto err_out;
637                 }
638         }
639
640         /* Call _PSD for all CPUs */
641         for_each_possible_cpu(i) {
642                 pr = per_cpu(processors, i);
643                 if (!pr)
644                         continue;
645
646                 pr->performance = per_cpu_ptr(performance, i);
647                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
648                 if (acpi_processor_get_psd(pr)) {
649                         retval = -EINVAL;
650                         continue;
651                 }
652         }
653         if (retval)
654                 goto err_ret;
655
656         /*
657          * Now that we have _PSD data from all CPUs, lets setup P-state 
658          * domain info.
659          */
660         for_each_possible_cpu(i) {
661                 pr = per_cpu(processors, i);
662                 if (!pr)
663                         continue;
664
665                 if (cpumask_test_cpu(i, covered_cpus))
666                         continue;
667
668                 pdomain = &(pr->performance->domain_info);
669                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
670                 cpumask_set_cpu(i, covered_cpus);
671                 if (pdomain->num_processors <= 1)
672                         continue;
673
674                 /* Validate the Domain info */
675                 count_target = pdomain->num_processors;
676                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
677                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
678                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
679                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
680                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
681                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
682
683                 for_each_possible_cpu(j) {
684                         if (i == j)
685                                 continue;
686
687                         match_pr = per_cpu(processors, j);
688                         if (!match_pr)
689                                 continue;
690
691                         match_pdomain = &(match_pr->performance->domain_info);
692                         if (match_pdomain->domain != pdomain->domain)
693                                 continue;
694
695                         /* Here i and j are in the same domain */
696
697                         if (match_pdomain->num_processors != count_target) {
698                                 retval = -EINVAL;
699                                 goto err_ret;
700                         }
701
702                         if (pdomain->coord_type != match_pdomain->coord_type) {
703                                 retval = -EINVAL;
704                                 goto err_ret;
705                         }
706
707                         cpumask_set_cpu(j, covered_cpus);
708                         cpumask_set_cpu(j, pr->performance->shared_cpu_map);
709                 }
710
711                 for_each_possible_cpu(j) {
712                         if (i == j)
713                                 continue;
714
715                         match_pr = per_cpu(processors, j);
716                         if (!match_pr)
717                                 continue;
718
719                         match_pdomain = &(match_pr->performance->domain_info);
720                         if (match_pdomain->domain != pdomain->domain)
721                                 continue;
722
723                         match_pr->performance->shared_type = 
724                                         pr->performance->shared_type;
725                         cpumask_copy(match_pr->performance->shared_cpu_map,
726                                      pr->performance->shared_cpu_map);
727                 }
728         }
729
730 err_ret:
731         for_each_possible_cpu(i) {
732                 pr = per_cpu(processors, i);
733                 if (!pr || !pr->performance)
734                         continue;
735
736                 /* Assume no coordination on any error parsing domain info */
737                 if (retval) {
738                         cpumask_clear(pr->performance->shared_cpu_map);
739                         cpumask_set_cpu(i, pr->performance->shared_cpu_map);
740                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
741                 }
742                 pr->performance = NULL; /* Will be set for real in register */
743         }
744
745 err_out:
746         mutex_unlock(&performance_mutex);
747         free_cpumask_var(covered_cpus);
748         return retval;
749 }
750 EXPORT_SYMBOL(acpi_processor_preregister_performance);
751
752 int
753 acpi_processor_register_performance(struct acpi_processor_performance
754                                     *performance, unsigned int cpu)
755 {
756         struct acpi_processor *pr;
757
758         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
759                 return -EINVAL;
760
761         mutex_lock(&performance_mutex);
762
763         pr = per_cpu(processors, cpu);
764         if (!pr) {
765                 mutex_unlock(&performance_mutex);
766                 return -ENODEV;
767         }
768
769         if (pr->performance) {
770                 mutex_unlock(&performance_mutex);
771                 return -EBUSY;
772         }
773
774         WARN_ON(!performance);
775
776         pr->performance = performance;
777
778         if (acpi_processor_get_performance_info(pr)) {
779                 pr->performance = NULL;
780                 mutex_unlock(&performance_mutex);
781                 return -EIO;
782         }
783
784         mutex_unlock(&performance_mutex);
785         return 0;
786 }
787
788 EXPORT_SYMBOL(acpi_processor_register_performance);
789
790 void acpi_processor_unregister_performance(unsigned int cpu)
791 {
792         struct acpi_processor *pr;
793
794         mutex_lock(&performance_mutex);
795
796         pr = per_cpu(processors, cpu);
797         if (!pr) {
798                 mutex_unlock(&performance_mutex);
799                 return;
800         }
801
802         if (pr->performance)
803                 kfree(pr->performance->states);
804         pr->performance = NULL;
805
806         mutex_unlock(&performance_mutex);
807
808         return;
809 }
810
811 EXPORT_SYMBOL(acpi_processor_unregister_performance);