ACPI / APEI: fix error return code in ghes_probe()
[linux-3.10.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 #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                 /*
344                  * MSR C001_0064+:
345                  * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
346                  */
347                 if (!(hi & BIT(31)))
348                         return;
349
350                 fid = lo & 0x3f;
351                 did = (lo >> 6) & 7;
352                 if (boot_cpu_data.x86 == 0x10)
353                         px->core_frequency = (100 * (fid + 0x10)) >> did;
354                 else
355                         px->core_frequency = (100 * (fid + 8)) >> did;
356         }
357 }
358 #else
359 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
360 #endif
361
362 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
363 {
364         int result = 0;
365         acpi_status status = AE_OK;
366         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
367         struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
368         struct acpi_buffer state = { 0, NULL };
369         union acpi_object *pss = NULL;
370         int i;
371         int last_invalid = -1;
372
373
374         status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
375         if (ACPI_FAILURE(status)) {
376                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
377                 return -ENODEV;
378         }
379
380         pss = buffer.pointer;
381         if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
382                 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
383                 result = -EFAULT;
384                 goto end;
385         }
386
387         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
388                           pss->package.count));
389
390         pr->performance->state_count = pss->package.count;
391         pr->performance->states =
392             kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
393                     GFP_KERNEL);
394         if (!pr->performance->states) {
395                 result = -ENOMEM;
396                 goto end;
397         }
398
399         for (i = 0; i < pr->performance->state_count; i++) {
400
401                 struct acpi_processor_px *px = &(pr->performance->states[i]);
402
403                 state.length = sizeof(struct acpi_processor_px);
404                 state.pointer = px;
405
406                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
407
408                 status = acpi_extract_package(&(pss->package.elements[i]),
409                                               &format, &state);
410                 if (ACPI_FAILURE(status)) {
411                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
412                         result = -EFAULT;
413                         kfree(pr->performance->states);
414                         goto end;
415                 }
416
417                 amd_fixup_frequency(px, i);
418
419                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
420                                   "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
421                                   i,
422                                   (u32) px->core_frequency,
423                                   (u32) px->power,
424                                   (u32) px->transition_latency,
425                                   (u32) px->bus_master_latency,
426                                   (u32) px->control, (u32) px->status));
427
428                 /*
429                  * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
430                  */
431                 if (!px->core_frequency ||
432                     ((u32)(px->core_frequency * 1000) !=
433                      (px->core_frequency * 1000))) {
434                         printk(KERN_ERR FW_BUG PREFIX
435                                "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
436                                pr->id, px->core_frequency);
437                         if (last_invalid == -1)
438                                 last_invalid = i;
439                 } else {
440                         if (last_invalid != -1) {
441                                 /*
442                                  * Copy this valid entry over last_invalid entry
443                                  */
444                                 memcpy(&(pr->performance->states[last_invalid]),
445                                        px, sizeof(struct acpi_processor_px));
446                                 ++last_invalid;
447                         }
448                 }
449         }
450
451         if (last_invalid == 0) {
452                 printk(KERN_ERR FW_BUG PREFIX
453                        "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
454                 result = -EFAULT;
455                 kfree(pr->performance->states);
456                 pr->performance->states = NULL;
457         }
458
459         if (last_invalid > 0)
460                 pr->performance->state_count = last_invalid;
461
462       end:
463         kfree(buffer.pointer);
464
465         return result;
466 }
467
468 int acpi_processor_get_performance_info(struct acpi_processor *pr)
469 {
470         int result = 0;
471         acpi_status status = AE_OK;
472         acpi_handle handle = NULL;
473
474         if (!pr || !pr->performance || !pr->handle)
475                 return -EINVAL;
476
477         status = acpi_get_handle(pr->handle, "_PCT", &handle);
478         if (ACPI_FAILURE(status)) {
479                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
480                                   "ACPI-based processor performance control unavailable\n"));
481                 return -ENODEV;
482         }
483
484         result = acpi_processor_get_performance_control(pr);
485         if (result)
486                 goto update_bios;
487
488         result = acpi_processor_get_performance_states(pr);
489         if (result)
490                 goto update_bios;
491
492         /* We need to call _PPC once when cpufreq starts */
493         if (ignore_ppc != 1)
494                 result = acpi_processor_get_platform_limit(pr);
495
496         return result;
497
498         /*
499          * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
500          * the BIOS is older than the CPU and does not know its frequencies
501          */
502  update_bios:
503 #ifdef CONFIG_X86
504         if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){
505                 if(boot_cpu_has(X86_FEATURE_EST))
506                         printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
507                                "frequency support\n");
508         }
509 #endif
510         return result;
511 }
512 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
513 int acpi_processor_notify_smm(struct module *calling_module)
514 {
515         acpi_status status;
516         static int is_done = 0;
517
518
519         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
520                 return -EBUSY;
521
522         if (!try_module_get(calling_module))
523                 return -EINVAL;
524
525         /* is_done is set to negative if an error occurred,
526          * and to postitive if _no_ error occurred, but SMM
527          * was already notified. This avoids double notification
528          * which might lead to unexpected results...
529          */
530         if (is_done > 0) {
531                 module_put(calling_module);
532                 return 0;
533         } else if (is_done < 0) {
534                 module_put(calling_module);
535                 return is_done;
536         }
537
538         is_done = -EIO;
539
540         /* Can't write pstate_control to smi_command if either value is zero */
541         if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
542                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
543                 module_put(calling_module);
544                 return 0;
545         }
546
547         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
548                           "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
549                           acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
550
551         status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
552                                     (u32) acpi_gbl_FADT.pstate_control, 8);
553         if (ACPI_FAILURE(status)) {
554                 ACPI_EXCEPTION((AE_INFO, status,
555                                 "Failed to write pstate_control [0x%x] to "
556                                 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
557                                 acpi_gbl_FADT.smi_command));
558                 module_put(calling_module);
559                 return status;
560         }
561
562         /* Success. If there's no _PPC, we need to fear nothing, so
563          * we can allow the cpufreq driver to be rmmod'ed. */
564         is_done = 1;
565
566         if (!(acpi_processor_ppc_status & PPC_IN_USE))
567                 module_put(calling_module);
568
569         return 0;
570 }
571
572 EXPORT_SYMBOL(acpi_processor_notify_smm);
573
574 static int acpi_processor_get_psd(struct acpi_processor *pr)
575 {
576         int result = 0;
577         acpi_status status = AE_OK;
578         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
579         struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
580         struct acpi_buffer state = {0, NULL};
581         union acpi_object  *psd = NULL;
582         struct acpi_psd_package *pdomain;
583
584         status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
585         if (ACPI_FAILURE(status)) {
586                 return -ENODEV;
587         }
588
589         psd = buffer.pointer;
590         if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
591                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
592                 result = -EFAULT;
593                 goto end;
594         }
595
596         if (psd->package.count != 1) {
597                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
598                 result = -EFAULT;
599                 goto end;
600         }
601
602         pdomain = &(pr->performance->domain_info);
603
604         state.length = sizeof(struct acpi_psd_package);
605         state.pointer = pdomain;
606
607         status = acpi_extract_package(&(psd->package.elements[0]),
608                 &format, &state);
609         if (ACPI_FAILURE(status)) {
610                 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
611                 result = -EFAULT;
612                 goto end;
613         }
614
615         if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
616                 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
617                 result = -EFAULT;
618                 goto end;
619         }
620
621         if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
622                 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
623                 result = -EFAULT;
624                 goto end;
625         }
626
627         if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
628             pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
629             pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
630                 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
631                 result = -EFAULT;
632                 goto end;
633         }
634 end:
635         kfree(buffer.pointer);
636         return result;
637 }
638
639 int acpi_processor_preregister_performance(
640                 struct acpi_processor_performance __percpu *performance)
641 {
642         int count, count_target;
643         int retval = 0;
644         unsigned int i, j;
645         cpumask_var_t covered_cpus;
646         struct acpi_processor *pr;
647         struct acpi_psd_package *pdomain;
648         struct acpi_processor *match_pr;
649         struct acpi_psd_package *match_pdomain;
650
651         if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
652                 return -ENOMEM;
653
654         mutex_lock(&performance_mutex);
655
656         /*
657          * Check if another driver has already registered, and abort before
658          * changing pr->performance if it has. Check input data as well.
659          */
660         for_each_possible_cpu(i) {
661                 pr = per_cpu(processors, i);
662                 if (!pr) {
663                         /* Look only at processors in ACPI namespace */
664                         continue;
665                 }
666
667                 if (pr->performance) {
668                         retval = -EBUSY;
669                         goto err_out;
670                 }
671
672                 if (!performance || !per_cpu_ptr(performance, i)) {
673                         retval = -EINVAL;
674                         goto err_out;
675                 }
676         }
677
678         /* Call _PSD for all CPUs */
679         for_each_possible_cpu(i) {
680                 pr = per_cpu(processors, i);
681                 if (!pr)
682                         continue;
683
684                 pr->performance = per_cpu_ptr(performance, i);
685                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
686                 if (acpi_processor_get_psd(pr)) {
687                         retval = -EINVAL;
688                         continue;
689                 }
690         }
691         if (retval)
692                 goto err_ret;
693
694         /*
695          * Now that we have _PSD data from all CPUs, lets setup P-state 
696          * domain info.
697          */
698         for_each_possible_cpu(i) {
699                 pr = per_cpu(processors, i);
700                 if (!pr)
701                         continue;
702
703                 if (cpumask_test_cpu(i, covered_cpus))
704                         continue;
705
706                 pdomain = &(pr->performance->domain_info);
707                 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
708                 cpumask_set_cpu(i, covered_cpus);
709                 if (pdomain->num_processors <= 1)
710                         continue;
711
712                 /* Validate the Domain info */
713                 count_target = pdomain->num_processors;
714                 count = 1;
715                 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
716                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
717                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
718                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
719                 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
720                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
721
722                 for_each_possible_cpu(j) {
723                         if (i == j)
724                                 continue;
725
726                         match_pr = per_cpu(processors, j);
727                         if (!match_pr)
728                                 continue;
729
730                         match_pdomain = &(match_pr->performance->domain_info);
731                         if (match_pdomain->domain != pdomain->domain)
732                                 continue;
733
734                         /* Here i and j are in the same domain */
735
736                         if (match_pdomain->num_processors != count_target) {
737                                 retval = -EINVAL;
738                                 goto err_ret;
739                         }
740
741                         if (pdomain->coord_type != match_pdomain->coord_type) {
742                                 retval = -EINVAL;
743                                 goto err_ret;
744                         }
745
746                         cpumask_set_cpu(j, covered_cpus);
747                         cpumask_set_cpu(j, pr->performance->shared_cpu_map);
748                         count++;
749                 }
750
751                 for_each_possible_cpu(j) {
752                         if (i == j)
753                                 continue;
754
755                         match_pr = per_cpu(processors, j);
756                         if (!match_pr)
757                                 continue;
758
759                         match_pdomain = &(match_pr->performance->domain_info);
760                         if (match_pdomain->domain != pdomain->domain)
761                                 continue;
762
763                         match_pr->performance->shared_type = 
764                                         pr->performance->shared_type;
765                         cpumask_copy(match_pr->performance->shared_cpu_map,
766                                      pr->performance->shared_cpu_map);
767                 }
768         }
769
770 err_ret:
771         for_each_possible_cpu(i) {
772                 pr = per_cpu(processors, i);
773                 if (!pr || !pr->performance)
774                         continue;
775
776                 /* Assume no coordination on any error parsing domain info */
777                 if (retval) {
778                         cpumask_clear(pr->performance->shared_cpu_map);
779                         cpumask_set_cpu(i, pr->performance->shared_cpu_map);
780                         pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
781                 }
782                 pr->performance = NULL; /* Will be set for real in register */
783         }
784
785 err_out:
786         mutex_unlock(&performance_mutex);
787         free_cpumask_var(covered_cpus);
788         return retval;
789 }
790 EXPORT_SYMBOL(acpi_processor_preregister_performance);
791
792 int
793 acpi_processor_register_performance(struct acpi_processor_performance
794                                     *performance, unsigned int cpu)
795 {
796         struct acpi_processor *pr;
797
798         if (!(acpi_processor_ppc_status & PPC_REGISTERED))
799                 return -EINVAL;
800
801         mutex_lock(&performance_mutex);
802
803         pr = per_cpu(processors, cpu);
804         if (!pr) {
805                 mutex_unlock(&performance_mutex);
806                 return -ENODEV;
807         }
808
809         if (pr->performance) {
810                 mutex_unlock(&performance_mutex);
811                 return -EBUSY;
812         }
813
814         WARN_ON(!performance);
815
816         pr->performance = performance;
817
818         if (acpi_processor_get_performance_info(pr)) {
819                 pr->performance = NULL;
820                 mutex_unlock(&performance_mutex);
821                 return -EIO;
822         }
823
824         mutex_unlock(&performance_mutex);
825         return 0;
826 }
827
828 EXPORT_SYMBOL(acpi_processor_register_performance);
829
830 void
831 acpi_processor_unregister_performance(struct acpi_processor_performance
832                                       *performance, unsigned int cpu)
833 {
834         struct acpi_processor *pr;
835
836         mutex_lock(&performance_mutex);
837
838         pr = per_cpu(processors, cpu);
839         if (!pr) {
840                 mutex_unlock(&performance_mutex);
841                 return;
842         }
843
844         if (pr->performance)
845                 kfree(pr->performance->states);
846         pr->performance = NULL;
847
848         mutex_unlock(&performance_mutex);
849
850         return;
851 }
852
853 EXPORT_SYMBOL(acpi_processor_unregister_performance);