5207f9e4b4438bfdab9448c2f8d5c365f3b0e09d
[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         result = acpi_processor_get_platform_limit(pr);
326         if (result)
327                 return result;
328
329         return 0;
330 }
331
332 int acpi_processor_notify_smm(struct module *calling_module)
333 {
334         acpi_status status;
335         static int is_done = 0;
336
337
338         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
339                 return -EBUSY;
340
341         if (!try_module_get(calling_module))
342                 return -EINVAL;
343
344         /* is_done is set to negative if an error occured,
345          * and to postitive if _no_ error occured, but SMM
346          * was already notified. This avoids double notification
347          * which might lead to unexpected results...
348          */
349         if (is_done > 0) {
350                 module_put(calling_module);
351                 return 0;
352         } else if (is_done < 0) {
353                 module_put(calling_module);
354                 return is_done;
355         }
356
357         is_done = -EIO;
358
359         /* Can't write pstate_cnt to smi_cmd if either value is zero */
360         if ((!acpi_fadt.smi_cmd) || (!acpi_fadt.pstate_cnt)) {
361                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_cnt\n"));
362                 module_put(calling_module);
363                 return 0;
364         }
365
366         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
367                           "Writing pstate_cnt [0x%x] to smi_cmd [0x%x]\n",
368                           acpi_fadt.pstate_cnt, acpi_fadt.smi_cmd));
369
370         /* FADT v1 doesn't support pstate_cnt, many BIOS vendors use
371          * it anyway, so we need to support it... */
372         if (acpi_fadt_is_v1) {
373                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
374                                   "Using v1.0 FADT reserved value for pstate_cnt\n"));
375         }
376
377         status = acpi_os_write_port(acpi_fadt.smi_cmd,
378                                     (u32) acpi_fadt.pstate_cnt, 8);
379         if (ACPI_FAILURE(status)) {
380                 ACPI_EXCEPTION((AE_INFO, status,
381                                 "Failed to write pstate_cnt [0x%x] to "
382                                 "smi_cmd [0x%x]", acpi_fadt.pstate_cnt,
383                                 acpi_fadt.smi_cmd));
384                 module_put(calling_module);
385                 return status;
386         }
387
388         /* Success. If there's no _PPC, we need to fear nothing, so
389          * we can allow the cpufreq driver to be rmmod'ed. */
390         is_done = 1;
391
392         if (!(acpi_processor_ppc_status & PPC_IN_USE))
393                 module_put(calling_module);
394
395         return 0;
396 }
397
398 EXPORT_SYMBOL(acpi_processor_notify_smm);
399
400 #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
401 /* /proc/acpi/processor/../performance interface (DEPRECATED) */
402
403 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file);
404 static struct file_operations acpi_processor_perf_fops = {
405         .open = acpi_processor_perf_open_fs,
406         .read = seq_read,
407         .llseek = seq_lseek,
408         .release = single_release,
409 };
410
411 static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset)
412 {
413         struct acpi_processor *pr = seq->private;
414         int i;
415
416
417         if (!pr)
418                 goto end;
419
420         if (!pr->performance) {
421                 seq_puts(seq, "<not supported>\n");
422                 goto end;
423         }
424
425         seq_printf(seq, "state count:             %d\n"
426                    "active state:            P%d\n",
427                    pr->performance->state_count, pr->performance->state);
428
429         seq_puts(seq, "states:\n");
430         for (i = 0; i < pr->performance->state_count; i++)
431                 seq_printf(seq,
432                            "   %cP%d:                  %d MHz, %d mW, %d uS\n",
433                            (i == pr->performance->state ? '*' : ' '), i,
434                            (u32) pr->performance->states[i].core_frequency,
435                            (u32) pr->performance->states[i].power,
436                            (u32) pr->performance->states[i].transition_latency);
437
438       end:
439         return 0;
440 }
441
442 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file)
443 {
444         return single_open(file, acpi_processor_perf_seq_show,
445                            PDE(inode)->data);
446 }
447
448 static ssize_t
449 acpi_processor_write_performance(struct file *file,
450                                  const char __user * buffer,
451                                  size_t count, loff_t * data)
452 {
453         int result = 0;
454         struct seq_file *m = file->private_data;
455         struct acpi_processor *pr = m->private;
456         struct acpi_processor_performance *perf;
457         char state_string[12] = { '\0' };
458         unsigned int new_state = 0;
459         struct cpufreq_policy policy;
460
461
462         if (!pr || (count > sizeof(state_string) - 1))
463                 return -EINVAL;
464
465         perf = pr->performance;
466         if (!perf)
467                 return -EINVAL;
468
469         if (copy_from_user(state_string, buffer, count))
470                 return -EFAULT;
471
472         state_string[count] = '\0';
473         new_state = simple_strtoul(state_string, NULL, 0);
474
475         if (new_state >= perf->state_count)
476                 return -EINVAL;
477
478         cpufreq_get_policy(&policy, pr->id);
479
480         policy.cpu = pr->id;
481         policy.min = perf->states[new_state].core_frequency * 1000;
482         policy.max = perf->states[new_state].core_frequency * 1000;
483
484         result = cpufreq_set_policy(&policy);
485         if (result)
486                 return result;
487
488         return count;
489 }
490
491 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
492 {
493         struct proc_dir_entry *entry = NULL;
494         struct acpi_device *device = NULL;
495
496
497         if (acpi_bus_get_device(pr->handle, &device))
498                 return;
499
500         /* add file 'performance' [R/W] */
501         entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
502                                   S_IFREG | S_IRUGO | S_IWUSR,
503                                   acpi_device_dir(device));
504         if (entry){
505                 acpi_processor_perf_fops.write = acpi_processor_write_performance;
506                 entry->proc_fops = &acpi_processor_perf_fops;
507                 entry->data = acpi_driver_data(device);
508                 entry->owner = THIS_MODULE;
509         }
510         return;
511 }
512
513 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
514 {
515         struct acpi_device *device = NULL;
516
517
518         if (acpi_bus_get_device(pr->handle, &device))
519                 return;
520
521         /* remove file 'performance' */
522         remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
523                           acpi_device_dir(device));
524
525         return;
526 }
527
528 #else
529 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
530 {
531         return;
532 }
533 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
534 {
535         return;
536 }
537 #endif                          /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
538
539 static int acpi_processor_get_psd(struct acpi_processor *pr)
540 {
541         int result = 0;
542         acpi_status status = AE_OK;
543         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
544         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
545         struct acpi_buffer state = {0, NULL};
546         union acpi_object  *psd = NULL;
547         struct acpi_psd_package *pdomain;
548
549         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
550         if (ACPI_FAILURE(status)) {
551                 return -ENODEV;
552         }
553
554         psd = buffer.pointer;
555         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
556                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
557                 result = -EFAULT;
558                 goto end;
559         }
560
561         if (psd->package.count != 1) {
562                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
563                 result = -EFAULT;
564                 goto end;
565         }
566
567         pdomain = &(pr->performance->domain_info);
568
569         state.length = sizeof(struct acpi_psd_package);
570         state.pointer = pdomain;
571
572         status = acpi_extract_package(&(psd->package.elements[0]),
573                 &format, &state);
574         if (ACPI_FAILURE(status)) {
575                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
576                 result = -EFAULT;
577                 goto end;
578         }
579
580         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
581                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n"));
582                 result = -EFAULT;
583                 goto end;
584         }
585
586         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
587                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n"));
588                 result = -EFAULT;
589                 goto end;
590         }
591
592 end:
593         kfree(buffer.pointer);
594         return result;
595 }
596
597 int acpi_processor_preregister_performance(
598                 struct acpi_processor_performance **performance)
599 {
600         int count, count_target;
601         int retval = 0;
602         unsigned int i, j;
603         cpumask_t covered_cpus;
604         struct acpi_processor *pr;
605         struct acpi_psd_package *pdomain;
606         struct acpi_processor *match_pr;
607         struct acpi_psd_package *match_pdomain;
608
609         mutex_lock(&performance_mutex);
610
611         retval = 0;
612
613         /* Call _PSD for all CPUs */
614         for_each_possible_cpu(i) {
615                 pr = processors[i];
616                 if (!pr) {
617                         /* Look only at processors in ACPI namespace */
618                         continue;
619                 }
620
621                 if (pr->performance) {
622                         retval = -EBUSY;
623                         continue;
624                 }
625
626                 if (!performance || !performance[i]) {
627                         retval = -EINVAL;
628                         continue;
629                 }
630
631                 pr->performance = performance[i];
632                 cpu_set(i, pr->performance->shared_cpu_map);
633                 if (acpi_processor_get_psd(pr)) {
634                         retval = -EINVAL;
635                         continue;
636                 }
637         }
638         if (retval)
639                 goto err_ret;
640
641         /*
642          * Now that we have _PSD data from all CPUs, lets setup P-state 
643          * domain info.
644          */
645         for_each_possible_cpu(i) {
646                 pr = processors[i];
647                 if (!pr)
648                         continue;
649
650                 /* Basic validity check for domain info */
651                 pdomain = &(pr->performance->domain_info);
652                 if ((pdomain->revision != ACPI_PSD_REV0_REVISION) ||
653                     (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) {
654                         retval = -EINVAL;
655                         goto err_ret;
656                 }
657                 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
658                     pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
659                     pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
660                         retval = -EINVAL;
661                         goto err_ret;
662                 }
663         }
664
665         cpus_clear(covered_cpus);
666         for_each_possible_cpu(i) {
667                 pr = processors[i];
668                 if (!pr)
669                         continue;
670
671                 if (cpu_isset(i, covered_cpus))
672                         continue;
673
674                 pdomain = &(pr->performance->domain_info);
675                 cpu_set(i, pr->performance->shared_cpu_map);
676                 cpu_set(i, covered_cpus);
677                 if (pdomain->num_processors <= 1)
678                         continue;
679
680                 /* Validate the Domain info */
681                 count_target = pdomain->num_processors;
682                 count = 1;
683                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
684                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
685                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
686                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
687                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
688                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
689
690                 for_each_possible_cpu(j) {
691                         if (i == j)
692                                 continue;
693
694                         match_pr = processors[j];
695                         if (!match_pr)
696                                 continue;
697
698                         match_pdomain = &(match_pr->performance->domain_info);
699                         if (match_pdomain->domain != pdomain->domain)
700                                 continue;
701
702                         /* Here i and j are in the same domain */
703
704                         if (match_pdomain->num_processors != count_target) {
705                                 retval = -EINVAL;
706                                 goto err_ret;
707                         }
708
709                         if (pdomain->coord_type != match_pdomain->coord_type) {
710                                 retval = -EINVAL;
711                                 goto err_ret;
712                         }
713
714                         cpu_set(j, covered_cpus);
715                         cpu_set(j, pr->performance->shared_cpu_map);
716                         count++;
717                 }
718
719                 for_each_possible_cpu(j) {
720                         if (i == j)
721                                 continue;
722
723                         match_pr = processors[j];
724                         if (!match_pr)
725                                 continue;
726
727                         match_pdomain = &(match_pr->performance->domain_info);
728                         if (match_pdomain->domain != pdomain->domain)
729                                 continue;
730
731                         match_pr->performance->shared_type = 
732                                         pr->performance->shared_type;
733                         match_pr->performance->shared_cpu_map =
734                                 pr->performance->shared_cpu_map;
735                 }
736         }
737
738 err_ret:
739         for_each_possible_cpu(i) {
740                 pr = processors[i];
741                 if (!pr || !pr->performance)
742                         continue;
743
744                 /* Assume no coordination on any error parsing domain info */
745                 if (retval) {
746                         cpus_clear(pr->performance->shared_cpu_map);
747                         cpu_set(i, pr->performance->shared_cpu_map);
748                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
749                 }
750                 pr->performance = NULL; /* Will be set for real in register */
751         }
752
753         mutex_unlock(&performance_mutex);
754         return retval;
755 }
756 EXPORT_SYMBOL(acpi_processor_preregister_performance);
757
758
759 int
760 acpi_processor_register_performance(struct acpi_processor_performance
761                                     *performance, unsigned int cpu)
762 {
763         struct acpi_processor *pr;
764
765
766         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
767                 return -EINVAL;
768
769         mutex_lock(&performance_mutex);
770
771         pr = processors[cpu];
772         if (!pr) {
773                 mutex_unlock(&performance_mutex);
774                 return -ENODEV;
775         }
776
777         if (pr->performance) {
778                 mutex_unlock(&performance_mutex);
779                 return -EBUSY;
780         }
781
782         WARN_ON(!performance);
783
784         pr->performance = performance;
785
786         if (acpi_processor_get_performance_info(pr)) {
787                 pr->performance = NULL;
788                 mutex_unlock(&performance_mutex);
789                 return -EIO;
790         }
791
792         acpi_cpufreq_add_file(pr);
793
794         mutex_unlock(&performance_mutex);
795         return 0;
796 }
797
798 EXPORT_SYMBOL(acpi_processor_register_performance);
799
800 void
801 acpi_processor_unregister_performance(struct acpi_processor_performance
802                                       *performance, unsigned int cpu)
803 {
804         struct acpi_processor *pr;
805
806
807         mutex_lock(&performance_mutex);
808
809         pr = processors[cpu];
810         if (!pr) {
811                 mutex_unlock(&performance_mutex);
812                 return;
813         }
814
815         if (pr->performance)
816                 kfree(pr->performance->states);
817         pr->performance = NULL;
818
819         acpi_cpufreq_remove_file(pr);
820
821         mutex_unlock(&performance_mutex);
822
823         return;
824 }
825
826 EXPORT_SYMBOL(acpi_processor_unregister_performance);