Free Electrons

Embedded Linux Experts

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
/*
 * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $)
 *
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *  Copyright (C) 2004       Dominik Brodowski <linux@brodo.de>
 *  Copyright (C) 2004  Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
 *  			- Added processor hotplug support
 *
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <acpi/processor.h>
#ifdef CONFIG_X86
#include <asm/cpufeature.h>
#endif

#define PREFIX "ACPI: "

#define ACPI_PROCESSOR_CLASS		"processor"
#define ACPI_PROCESSOR_FILE_PERFORMANCE	"performance"
#define _COMPONENT		ACPI_PROCESSOR_COMPONENT
ACPI_MODULE_NAME("processor_perflib");

static DEFINE_MUTEX(performance_mutex);

/*
 * _PPC support is implemented as a CPUfreq policy notifier:
 * This means each time a CPUfreq driver registered also with
 * the ACPI core is asked to change the speed policy, the maximum
 * value is adjusted so that it is within the platform limit.
 *
 * Also, when a new platform limit value is detected, the CPUfreq
 * policy is adjusted accordingly.
 */

/* ignore_ppc:
 * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
 *       ignore _PPC
 *  0 -> cpufreq low level drivers initialized -> consider _PPC values
 *  1 -> ignore _PPC totally -> forced by user through boot param
 */
static int ignore_ppc = -1;
module_param(ignore_ppc, int, 0644);
MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
		 "limited by BIOS, this should help");

#define PPC_REGISTERED   1
#define PPC_IN_USE       2

static int acpi_processor_ppc_status;

static int acpi_processor_ppc_notifier(struct notifier_block *nb,
				       unsigned long event, void *data)
{
	struct cpufreq_policy *policy = data;
	struct acpi_processor *pr;
	unsigned int ppc = 0;

	if (event == CPUFREQ_START && ignore_ppc <= 0) {
		ignore_ppc = 0;
		return 0;
	}

	if (ignore_ppc)
		return 0;

	if (event != CPUFREQ_INCOMPATIBLE)
		return 0;

	mutex_lock(&performance_mutex);

	pr = per_cpu(processors, policy->cpu);
	if (!pr || !pr->performance)
		goto out;

	ppc = (unsigned int)pr->performance_platform_limit;

	if (ppc >= pr->performance->state_count)
		goto out;

	cpufreq_verify_within_limits(policy, 0,
				     pr->performance->states[ppc].
				     core_frequency * 1000);

      out:
	mutex_unlock(&performance_mutex);

	return 0;
}

static struct notifier_block acpi_ppc_notifier_block = {
	.notifier_call = acpi_processor_ppc_notifier,
};

static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
{
	acpi_status status = 0;
	unsigned long long ppc = 0;


	if (!pr)
		return -EINVAL;

	/*
	 * _PPC indicates the maximum state currently supported by the platform
	 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
	 */
	status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);

	if (status != AE_NOT_FOUND)
		acpi_processor_ppc_status |= PPC_IN_USE;

	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
		return -ENODEV;
	}

	pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
		       (int)ppc, ppc ? "" : "not");

	pr->performance_platform_limit = (int)ppc;

	return 0;
}

#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE	0x80
/*
 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
 * @handle: ACPI processor handle
 * @status: the status code of _PPC evaluation
 *	0: success. OSPM is now using the performance state specificed.
 *	1: failure. OSPM has not changed the number of P-states in use
 */
static void acpi_processor_ppc_ost(acpi_handle handle, int status)
{
	if (acpi_has_method(handle, "_OST"))
		acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
				  status, NULL);
}

int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
{
	int ret;

	if (ignore_ppc) {
		/*
		 * Only when it is notification event, the _OST object
		 * will be evaluated. Otherwise it is skipped.
		 */
		if (event_flag)
			acpi_processor_ppc_ost(pr->handle, 1);
		return 0;
	}

	ret = acpi_processor_get_platform_limit(pr);
	/*
	 * Only when it is notification event, the _OST object
	 * will be evaluated. Otherwise it is skipped.
	 */
	if (event_flag) {
		if (ret < 0)
			acpi_processor_ppc_ost(pr->handle, 1);
		else
			acpi_processor_ppc_ost(pr->handle, 0);
	}
	if (ret < 0)
		return (ret);
	else
		return cpufreq_update_policy(pr->id);
}

int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
{
	struct acpi_processor *pr;

	pr = per_cpu(processors, cpu);
	if (!pr || !pr->performance || !pr->performance->state_count)
		return -ENODEV;
	*limit = pr->performance->states[pr->performance_platform_limit].
		core_frequency * 1000;
	return 0;
}
EXPORT_SYMBOL(acpi_processor_get_bios_limit);

void acpi_processor_ppc_init(void)
{
	if (!cpufreq_register_notifier
	    (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
		acpi_processor_ppc_status |= PPC_REGISTERED;
	else
		printk(KERN_DEBUG
		       "Warning: Processor Platform Limit not supported.\n");
}

void acpi_processor_ppc_exit(void)
{
	if (acpi_processor_ppc_status & PPC_REGISTERED)
		cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
					    CPUFREQ_POLICY_NOTIFIER);

	acpi_processor_ppc_status &= ~PPC_REGISTERED;
}

static int acpi_processor_get_performance_control(struct acpi_processor *pr)
{
	int result = 0;
	acpi_status status = 0;
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *pct = NULL;
	union acpi_object obj = { 0 };


	status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
		return -ENODEV;
	}

	pct = (union acpi_object *)buffer.pointer;
	if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
	    || (pct->package.count != 2)) {
		printk(KERN_ERR PREFIX "Invalid _PCT data\n");
		result = -EFAULT;
		goto end;
	}

	/*
	 * control_register
	 */

	obj = pct->package.elements[0];

	if ((obj.type != ACPI_TYPE_BUFFER)
	    || (obj.buffer.length < sizeof(struct acpi_pct_register))
	    || (obj.buffer.pointer == NULL)) {
		printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
		result = -EFAULT;
		goto end;
	}
	memcpy(&pr->performance->control_register, obj.buffer.pointer,
	       sizeof(struct acpi_pct_register));

	/*
	 * status_register
	 */

	obj = pct->package.elements[1];

	if ((obj.type != ACPI_TYPE_BUFFER)
	    || (obj.buffer.length < sizeof(struct acpi_pct_register))
	    || (obj.buffer.pointer == NULL)) {
		printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
		result = -EFAULT;
		goto end;
	}

	memcpy(&pr->performance->status_register, obj.buffer.pointer,
	       sizeof(struct acpi_pct_register));

      end:
	kfree(buffer.pointer);

	return result;
}

#ifdef CONFIG_X86
/*
 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
 * in their ACPI data. Calculate the real values and fix up the _PSS data.
 */
static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
{
	u32 hi, lo, fid, did;
	int index = px->control & 0x00000007;

	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
		return;

	if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
	    || boot_cpu_data.x86 == 0x11) {
		rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
		/*
		 * MSR C001_0064+:
		 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
		 */
		if (!(hi & BIT(31)))
			return;

		fid = lo & 0x3f;
		did = (lo >> 6) & 7;
		if (boot_cpu_data.x86 == 0x10)
			px->core_frequency = (100 * (fid + 0x10)) >> did;
		else
			px->core_frequency = (100 * (fid + 8)) >> did;
	}
}
#else
static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
#endif

static int acpi_processor_get_performance_states(struct acpi_processor *pr)
{
	int result = 0;
	acpi_status status = AE_OK;
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
	struct acpi_buffer state = { 0, NULL };
	union acpi_object *pss = NULL;
	int i;
	int last_invalid = -1;


	status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
		return -ENODEV;
	}

	pss = buffer.pointer;
	if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
		printk(KERN_ERR PREFIX "Invalid _PSS data\n");
		result = -EFAULT;
		goto end;
	}

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
			  pss->package.count));

	pr->performance->state_count = pss->package.count;
	pr->performance->states =
	    kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
		    GFP_KERNEL);
	if (!pr->performance->states) {
		result = -ENOMEM;
		goto end;
	}

	for (i = 0; i < pr->performance->state_count; i++) {

		struct acpi_processor_px *px = &(pr->performance->states[i]);

		state.length = sizeof(struct acpi_processor_px);
		state.pointer = px;

		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));

		status = acpi_extract_package(&(pss->package.elements[i]),
					      &format, &state);
		if (ACPI_FAILURE(status)) {
			ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
			result = -EFAULT;
			kfree(pr->performance->states);
			goto end;
		}

		amd_fixup_frequency(px, i);

		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
				  i,
				  (u32) px->core_frequency,
				  (u32) px->power,
				  (u32) px->transition_latency,
				  (u32) px->bus_master_latency,
				  (u32) px->control, (u32) px->status));

		/*
 		 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
		 */
		if (!px->core_frequency ||
		    ((u32)(px->core_frequency * 1000) !=
		     (px->core_frequency * 1000))) {
			printk(KERN_ERR FW_BUG PREFIX
			       "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
			       pr->id, px->core_frequency);
			if (last_invalid == -1)
				last_invalid = i;
		} else {
			if (last_invalid != -1) {
				/*
				 * Copy this valid entry over last_invalid entry
				 */
				memcpy(&(pr->performance->states[last_invalid]),
				       px, sizeof(struct acpi_processor_px));
				++last_invalid;
			}
		}
	}

	if (last_invalid == 0) {
		printk(KERN_ERR FW_BUG PREFIX
		       "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
		result = -EFAULT;
		kfree(pr->performance->states);
		pr->performance->states = NULL;
	}

	if (last_invalid > 0)
		pr->performance->state_count = last_invalid;

      end:
	kfree(buffer.pointer);

	return result;
}

int acpi_processor_get_performance_info(struct acpi_processor *pr)
{
	int result = 0;

	if (!pr || !pr->performance || !pr->handle)
		return -EINVAL;

	if (!acpi_has_method(pr->handle, "_PCT")) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "ACPI-based processor performance control unavailable\n"));
		return -ENODEV;
	}

	result = acpi_processor_get_performance_control(pr);
	if (result)
		goto update_bios;

	result = acpi_processor_get_performance_states(pr);
	if (result)
		goto update_bios;

	/* We need to call _PPC once when cpufreq starts */
	if (ignore_ppc != 1)
		result = acpi_processor_get_platform_limit(pr);

	return result;

	/*
	 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
	 * the BIOS is older than the CPU and does not know its frequencies
	 */
 update_bios:
#ifdef CONFIG_X86
	if (acpi_has_method(pr->handle, "_PPC")) {
		if(boot_cpu_has(X86_FEATURE_EST))
			printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
			       "frequency support\n");
	}
#endif
	return result;
}
EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
int acpi_processor_notify_smm(struct module *calling_module)
{
	acpi_status status;
	static int is_done = 0;


	if (!(acpi_processor_ppc_status & PPC_REGISTERED))
		return -EBUSY;

	if (!try_module_get(calling_module))
		return -EINVAL;

	/* is_done is set to negative if an error occurred,
	 * and to postitive if _no_ error occurred, but SMM
	 * was already notified. This avoids double notification
	 * which might lead to unexpected results...
	 */
	if (is_done > 0) {
		module_put(calling_module);
		return 0;
	} else if (is_done < 0) {
		module_put(calling_module);
		return is_done;
	}

	is_done = -EIO;

	/* Can't write pstate_control to smi_command if either value is zero */
	if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
		module_put(calling_module);
		return 0;
	}

	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			  "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
			  acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));

	status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
				    (u32) acpi_gbl_FADT.pstate_control, 8);
	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status,
				"Failed to write pstate_control [0x%x] to "
				"smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
				acpi_gbl_FADT.smi_command));
		module_put(calling_module);
		return status;
	}

	/* Success. If there's no _PPC, we need to fear nothing, so
	 * we can allow the cpufreq driver to be rmmod'ed. */
	is_done = 1;

	if (!(acpi_processor_ppc_status & PPC_IN_USE))
		module_put(calling_module);

	return 0;
}

EXPORT_SYMBOL(acpi_processor_notify_smm);

static int acpi_processor_get_psd(struct acpi_processor	*pr)
{
	int result = 0;
	acpi_status status = AE_OK;
	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
	struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
	struct acpi_buffer state = {0, NULL};
	union acpi_object  *psd = NULL;
	struct acpi_psd_package *pdomain;

	status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
	if (ACPI_FAILURE(status)) {
		return -ENODEV;
	}

	psd = buffer.pointer;
	if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
		printk(KERN_ERR PREFIX "Invalid _PSD data\n");
		result = -EFAULT;
		goto end;
	}

	if (psd->package.count != 1) {
		printk(KERN_ERR PREFIX "Invalid _PSD data\n");
		result = -EFAULT;
		goto end;
	}

	pdomain = &(pr->performance->domain_info);

	state.length = sizeof(struct acpi_psd_package);
	state.pointer = pdomain;

	status = acpi_extract_package(&(psd->package.elements[0]),
		&format, &state);
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX "Invalid _PSD data\n");
		result = -EFAULT;
		goto end;
	}

	if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
		printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
		result = -EFAULT;
		goto end;
	}

	if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
		printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
		result = -EFAULT;
		goto end;
	}

	if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
	    pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
	    pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
		printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
		result = -EFAULT;
		goto end;
	}
end:
	kfree(buffer.pointer);
	return result;
}

int acpi_processor_preregister_performance(
		struct acpi_processor_performance __percpu *performance)
{
	int count_target;
	int retval = 0;
	unsigned int i, j;
	cpumask_var_t covered_cpus;
	struct acpi_processor *pr;
	struct acpi_psd_package *pdomain;
	struct acpi_processor *match_pr;
	struct acpi_psd_package *match_pdomain;

	if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
		return -ENOMEM;

	mutex_lock(&performance_mutex);

	/*
	 * Check if another driver has already registered, and abort before
	 * changing pr->performance if it has. Check input data as well.
	 */
	for_each_possible_cpu(i) {
		pr = per_cpu(processors, i);
		if (!pr) {
			/* Look only at processors in ACPI namespace */
			continue;
		}

		if (pr->performance) {
			retval = -EBUSY;
			goto err_out;
		}

		if (!performance || !per_cpu_ptr(performance, i)) {
			retval = -EINVAL;
			goto err_out;
		}
	}

	/* Call _PSD for all CPUs */
	for_each_possible_cpu(i) {
		pr = per_cpu(processors, i);
		if (!pr)
			continue;

		pr->performance = per_cpu_ptr(performance, i);
		cpumask_set_cpu(i, pr->performance->shared_cpu_map);
		if (acpi_processor_get_psd(pr)) {
			retval = -EINVAL;
			continue;
		}
	}
	if (retval)
		goto err_ret;

	/*
	 * Now that we have _PSD data from all CPUs, lets setup P-state 
	 * domain info.
	 */
	for_each_possible_cpu(i) {
		pr = per_cpu(processors, i);
		if (!pr)
			continue;

		if (cpumask_test_cpu(i, covered_cpus))
			continue;

		pdomain = &(pr->performance->domain_info);
		cpumask_set_cpu(i, pr->performance->shared_cpu_map);
		cpumask_set_cpu(i, covered_cpus);
		if (pdomain->num_processors <= 1)
			continue;

		/* Validate the Domain info */
		count_target = pdomain->num_processors;
		if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;

		for_each_possible_cpu(j) {
			if (i == j)
				continue;

			match_pr = per_cpu(processors, j);
			if (!match_pr)
				continue;

			match_pdomain = &(match_pr->performance->domain_info);
			if (match_pdomain->domain != pdomain->domain)
				continue;

			/* Here i and j are in the same domain */

			if (match_pdomain->num_processors != count_target) {
				retval = -EINVAL;
				goto err_ret;
			}

			if (pdomain->coord_type != match_pdomain->coord_type) {
				retval = -EINVAL;
				goto err_ret;
			}

			cpumask_set_cpu(j, covered_cpus);
			cpumask_set_cpu(j, pr->performance->shared_cpu_map);
		}

		for_each_possible_cpu(j) {
			if (i == j)
				continue;

			match_pr = per_cpu(processors, j);
			if (!match_pr)
				continue;

			match_pdomain = &(match_pr->performance->domain_info);
			if (match_pdomain->domain != pdomain->domain)
				continue;

			match_pr->performance->shared_type = 
					pr->performance->shared_type;
			cpumask_copy(match_pr->performance->shared_cpu_map,
				     pr->performance->shared_cpu_map);
		}
	}

err_ret:
	for_each_possible_cpu(i) {
		pr = per_cpu(processors, i);
		if (!pr || !pr->performance)
			continue;

		/* Assume no coordination on any error parsing domain info */
		if (retval) {
			cpumask_clear(pr->performance->shared_cpu_map);
			cpumask_set_cpu(i, pr->performance->shared_cpu_map);
			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
		}
		pr->performance = NULL; /* Will be set for real in register */
	}

err_out:
	mutex_unlock(&performance_mutex);
	free_cpumask_var(covered_cpus);
	return retval;
}
EXPORT_SYMBOL(acpi_processor_preregister_performance);

int
acpi_processor_register_performance(struct acpi_processor_performance
				    *performance, unsigned int cpu)
{
	struct acpi_processor *pr;

	if (!(acpi_processor_ppc_status & PPC_REGISTERED))
		return -EINVAL;

	mutex_lock(&performance_mutex);

	pr = per_cpu(processors, cpu);
	if (!pr) {
		mutex_unlock(&performance_mutex);
		return -ENODEV;
	}

	if (pr->performance) {
		mutex_unlock(&performance_mutex);
		return -EBUSY;
	}

	WARN_ON(!performance);

	pr->performance = performance;

	if (acpi_processor_get_performance_info(pr)) {
		pr->performance = NULL;
		mutex_unlock(&performance_mutex);
		return -EIO;
	}

	mutex_unlock(&performance_mutex);
	return 0;
}

EXPORT_SYMBOL(acpi_processor_register_performance);

void
acpi_processor_unregister_performance(struct acpi_processor_performance
				      *performance, unsigned int cpu)
{
	struct acpi_processor *pr;

	mutex_lock(&performance_mutex);

	pr = per_cpu(processors, cpu);
	if (!pr) {
		mutex_unlock(&performance_mutex);
		return;
	}

	if (pr->performance)
		kfree(pr->performance->states);
	pr->performance = NULL;

	mutex_unlock(&performance_mutex);

	return;
}

EXPORT_SYMBOL(acpi_processor_unregister_performance);