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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 #ifdef CONFIG_X86
328 /*
329  * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
330  * in their ACPI data. Calculate the real values and fix up the _PSS data.
331  */
332 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
333 {
334         u32 hi, lo, fid, did;
335         int index = px->control & 0x00000007;
336
337         if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
338                 return;
339
340         if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
341             || boot_cpu_data.x86 == 0x11) {
342                 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
343                 fid = lo & 0x3f;
344                 did = (lo >> 6) & 7;
345                 if (boot_cpu_data.x86 == 0x10)
346                         px->core_frequency = (100 * (fid + 0x10)) >> did;
347                 else
348                         px->core_frequency = (100 * (fid + 8)) >> did;
349         }
350 }
351 #else
352 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
353 #endif
354
355 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
356 {
357         int result = 0;
358         acpi_status status = AE_OK;
359         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
360         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
361         struct acpi_buffer state = { 0, NULL };
362         union acpi_object *pss = NULL;
363         int i;
364         int last_invalid = -1;
365
366
367         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
368         if (ACPI_FAILURE(status)) {
369                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
370                 return -ENODEV;
371         }
372
373         pss = buffer.pointer;
374         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
375                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
376                 result = -EFAULT;
377                 goto end;
378         }
379
380         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
381                           pss->package.count));
382
383         pr->performance->state_count = pss->package.count;
384         pr->performance->states =
385             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
386                     GFP_KERNEL);
387         if (!pr->performance->states) {
388                 result = -ENOMEM;
389                 goto end;
390         }
391
392         for (i = 0; i < pr->performance->state_count; i++) {
393
394                 struct acpi_processor_px *px = &(pr->performance->states[i]);
395
396                 state.length = sizeof(struct acpi_processor_px);
397                 state.pointer = px;
398
399                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
400
401                 status = acpi_extract_package(&(pss->package.elements[i]),
402                                               &format, &state);
403                 if (ACPI_FAILURE(status)) {
404                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
405                         result = -EFAULT;
406                         kfree(pr->performance->states);
407                         goto end;
408                 }
409
410                 amd_fixup_frequency(px, i);
411
412                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
413                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
414                                   i,
415                                   (u32) px->core_frequency,
416                                   (u32) px->power,
417                                   (u32) px->transition_latency,
418                                   (u32) px->bus_master_latency,
419                                   (u32) px->control, (u32) px->status));
420
421                 /*
422                  * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
423                  */
424                 if (!px->core_frequency ||
425                     ((u32)(px->core_frequency * 1000) !=
426                      (px->core_frequency * 1000))) {
427                         printk(KERN_ERR FW_BUG PREFIX
428                                "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
429                                pr->id, px->core_frequency);
430                         if (last_invalid == -1)
431                                 last_invalid = i;
432                 } else {
433                         if (last_invalid != -1) {
434                                 /*
435                                  * Copy this valid entry over last_invalid entry
436                                  */
437                                 memcpy(&(pr->performance->states[last_invalid]),
438                                        px, sizeof(struct acpi_processor_px));
439                                 ++last_invalid;
440                         }
441                 }
442         }
443
444         if (last_invalid == 0) {
445                 printk(KERN_ERR FW_BUG PREFIX
446                        "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
447                 result = -EFAULT;
448                 kfree(pr->performance->states);
449                 pr->performance->states = NULL;
450         }
451
452         if (last_invalid > 0)
453                 pr->performance->state_count = last_invalid;
454
455       end:
456         kfree(buffer.pointer);
457
458         return result;
459 }
460
461 static int acpi_processor_get_performance_info(struct acpi_processor *pr)
462 {
463         int result = 0;
464         acpi_status status = AE_OK;
465         acpi_handle handle = NULL;
466
467         if (!pr || !pr->performance || !pr->handle)
468                 return -EINVAL;
469
470         status = acpi_get_handle(pr->handle, "_PCT", &handle);
471         if (ACPI_FAILURE(status)) {
472                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
473                                   "ACPI-based processor performance control unavailable\n"));
474                 return -ENODEV;
475         }
476
477         result = acpi_processor_get_performance_control(pr);
478         if (result)
479                 goto update_bios;
480
481         result = acpi_processor_get_performance_states(pr);
482         if (result)
483                 goto update_bios;
484
485         /* We need to call _PPC once when cpufreq starts */
486         if (ignore_ppc != 1)
487                 result = acpi_processor_get_platform_limit(pr);
488
489         return result;
490
491         /*
492          * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
493          * the BIOS is older than the CPU and does not know its frequencies
494          */
495  update_bios:
496 #ifdef CONFIG_X86
497         if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){
498                 if(boot_cpu_has(X86_FEATURE_EST))
499                         printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
500                                "frequency support\n");
501         }
502 #endif
503         return result;
504 }
505
506 int acpi_processor_notify_smm(struct module *calling_module)
507 {
508         acpi_status status;
509         static int is_done = 0;
510
511
512         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
513                 return -EBUSY;
514
515         if (!try_module_get(calling_module))
516                 return -EINVAL;
517
518         /* is_done is set to negative if an error occurred,
519          * and to postitive if _no_ error occurred, but SMM
520          * was already notified. This avoids double notification
521          * which might lead to unexpected results...
522          */
523         if (is_done > 0) {
524                 module_put(calling_module);
525                 return 0;
526         } else if (is_done < 0) {
527                 module_put(calling_module);
528                 return is_done;
529         }
530
531         is_done = -EIO;
532
533         /* Can't write pstate_control to smi_command if either value is zero */
534         if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
535                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
536                 module_put(calling_module);
537                 return 0;
538         }
539
540         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
541                           "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
542                           acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
543
544         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
545                                     (u32) acpi_gbl_FADT.pstate_control, 8);
546         if (ACPI_FAILURE(status)) {
547                 ACPI_EXCEPTION((AE_INFO, status,
548                                 "Failed to write pstate_control [0x%x] to "
549                                 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
550                                 acpi_gbl_FADT.smi_command));
551                 module_put(calling_module);
552                 return status;
553         }
554
555         /* Success. If there's no _PPC, we need to fear nothing, so
556          * we can allow the cpufreq driver to be rmmod'ed. */
557         is_done = 1;
558
559         if (!(acpi_processor_ppc_status & PPC_IN_USE))
560                 module_put(calling_module);
561
562         return 0;
563 }
564
565 EXPORT_SYMBOL(acpi_processor_notify_smm);
566
567 static int acpi_processor_get_psd(struct acpi_processor *pr)
568 {
569         int result = 0;
570         acpi_status status = AE_OK;
571         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
572         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
573         struct acpi_buffer state = {0, NULL};
574         union acpi_object  *psd = NULL;
575         struct acpi_psd_package *pdomain;
576
577         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
578         if (ACPI_FAILURE(status)) {
579                 return -ENODEV;
580         }
581
582         psd = buffer.pointer;
583         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
584                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
585                 result = -EFAULT;
586                 goto end;
587         }
588
589         if (psd->package.count != 1) {
590                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
591                 result = -EFAULT;
592                 goto end;
593         }
594
595         pdomain = &(pr->performance->domain_info);
596
597         state.length = sizeof(struct acpi_psd_package);
598         state.pointer = pdomain;
599
600         status = acpi_extract_package(&(psd->package.elements[0]),
601                 &format, &state);
602         if (ACPI_FAILURE(status)) {
603                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
604                 result = -EFAULT;
605                 goto end;
606         }
607
608         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
609                 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
610                 result = -EFAULT;
611                 goto end;
612         }
613
614         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
615                 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
616                 result = -EFAULT;
617                 goto end;
618         }
619
620         if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
621             pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
622             pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
623                 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
624                 result = -EFAULT;
625                 goto end;
626         }
627 end:
628         kfree(buffer.pointer);
629         return result;
630 }
631
632 int acpi_processor_preregister_performance(
633                 struct acpi_processor_performance __percpu *performance)
634 {
635         int count, count_target;
636         int retval = 0;
637         unsigned int i, j;
638         cpumask_var_t covered_cpus;
639         struct acpi_processor *pr;
640         struct acpi_psd_package *pdomain;
641         struct acpi_processor *match_pr;
642         struct acpi_psd_package *match_pdomain;
643
644         if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
645                 return -ENOMEM;
646
647         mutex_lock(&performance_mutex);
648
649         /*
650          * Check if another driver has already registered, and abort before
651          * changing pr->performance if it has. Check input data as well.
652          */
653         for_each_possible_cpu(i) {
654                 pr = per_cpu(processors, i);
655                 if (!pr) {
656                         /* Look only at processors in ACPI namespace */
657                         continue;
658                 }
659
660                 if (pr->performance) {
661                         retval = -EBUSY;
662                         goto err_out;
663                 }
664
665                 if (!performance || !per_cpu_ptr(performance, i)) {
666                         retval = -EINVAL;
667                         goto err_out;
668                 }
669         }
670
671         /* Call _PSD for all CPUs */
672         for_each_possible_cpu(i) {
673                 pr = per_cpu(processors, i);
674                 if (!pr)
675                         continue;
676
677                 pr->performance = per_cpu_ptr(performance, i);
678                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
679                 if (acpi_processor_get_psd(pr)) {
680                         retval = -EINVAL;
681                         continue;
682                 }
683         }
684         if (retval)
685                 goto err_ret;
686
687         /*
688          * Now that we have _PSD data from all CPUs, lets setup P-state 
689          * domain info.
690          */
691         for_each_possible_cpu(i) {
692                 pr = per_cpu(processors, i);
693                 if (!pr)
694                         continue;
695
696                 if (cpumask_test_cpu(i, covered_cpus))
697                         continue;
698
699                 pdomain = &(pr->performance->domain_info);
700                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
701                 cpumask_set_cpu(i, covered_cpus);
702                 if (pdomain->num_processors <= 1)
703                         continue;
704
705                 /* Validate the Domain info */
706                 count_target = pdomain->num_processors;
707                 count = 1;
708                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
709                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
710                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
711                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
712                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
713                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
714
715                 for_each_possible_cpu(j) {
716                         if (i == j)
717                                 continue;
718
719                         match_pr = per_cpu(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                         /* Here i and j are in the same domain */
728
729                         if (match_pdomain->num_processors != count_target) {
730                                 retval = -EINVAL;
731                                 goto err_ret;
732                         }
733
734                         if (pdomain->coord_type != match_pdomain->coord_type) {
735                                 retval = -EINVAL;
736                                 goto err_ret;
737                         }
738
739                         cpumask_set_cpu(j, covered_cpus);
740                         cpumask_set_cpu(j, pr->performance->shared_cpu_map);
741                         count++;
742                 }
743
744                 for_each_possible_cpu(j) {
745                         if (i == j)
746                                 continue;
747
748                         match_pr = per_cpu(processors, j);
749                         if (!match_pr)
750                                 continue;
751
752                         match_pdomain = &(match_pr->performance->domain_info);
753                         if (match_pdomain->domain != pdomain->domain)
754                                 continue;
755
756                         match_pr->performance->shared_type = 
757                                         pr->performance->shared_type;
758                         cpumask_copy(match_pr->performance->shared_cpu_map,
759                                      pr->performance->shared_cpu_map);
760                 }
761         }
762
763 err_ret:
764         for_each_possible_cpu(i) {
765                 pr = per_cpu(processors, i);
766                 if (!pr || !pr->performance)
767                         continue;
768
769                 /* Assume no coordination on any error parsing domain info */
770                 if (retval) {
771                         cpumask_clear(pr->performance->shared_cpu_map);
772                         cpumask_set_cpu(i, pr->performance->shared_cpu_map);
773                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
774                 }
775                 pr->performance = NULL; /* Will be set for real in register */
776         }
777
778 err_out:
779         mutex_unlock(&performance_mutex);
780         free_cpumask_var(covered_cpus);
781         return retval;
782 }
783 EXPORT_SYMBOL(acpi_processor_preregister_performance);
784
785 int
786 acpi_processor_register_performance(struct acpi_processor_performance
787                                     *performance, unsigned int cpu)
788 {
789         struct acpi_processor *pr;
790
791         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
792                 return -EINVAL;
793
794         mutex_lock(&performance_mutex);
795
796         pr = per_cpu(processors, cpu);
797         if (!pr) {
798                 mutex_unlock(&performance_mutex);
799                 return -ENODEV;
800         }
801
802         if (pr->performance) {
803                 mutex_unlock(&performance_mutex);
804                 return -EBUSY;
805         }
806
807         WARN_ON(!performance);
808
809         pr->performance = performance;
810
811         if (acpi_processor_get_performance_info(pr)) {
812                 pr->performance = NULL;
813                 mutex_unlock(&performance_mutex);
814                 return -EIO;
815         }
816
817         mutex_unlock(&performance_mutex);
818         return 0;
819 }
820
821 EXPORT_SYMBOL(acpi_processor_register_performance);
822
823 void
824 acpi_processor_unregister_performance(struct acpi_processor_performance
825                                       *performance, unsigned int cpu)
826 {
827         struct acpi_processor *pr;
828
829         mutex_lock(&performance_mutex);
830
831         pr = per_cpu(processors, cpu);
832         if (!pr) {
833                 mutex_unlock(&performance_mutex);
834                 return;
835         }
836
837         if (pr->performance)
838                 kfree(pr->performance->states);
839         pr->performance = NULL;
840
841         mutex_unlock(&performance_mutex);
842
843         return;
844 }
845
846 EXPORT_SYMBOL(acpi_processor_unregister_performance);