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 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
328 {
329 	int result = 0;
330 	acpi_status status = AE_OK;
331 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
332 	struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
333 	struct acpi_buffer state = { 0, NULL };
334 	union acpi_object *pss = NULL;
335 	int i;
336 
337 
338 	status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
339 	if (ACPI_FAILURE(status)) {
340 		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
341 		return -ENODEV;
342 	}
343 
344 	pss = buffer.pointer;
345 	if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
346 		printk(KERN_ERR PREFIX "Invalid _PSS data\n");
347 		result = -EFAULT;
348 		goto end;
349 	}
350 
351 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
352 			  pss->package.count));
353 
354 	pr->performance->state_count = pss->package.count;
355 	pr->performance->states =
356 	    kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
357 		    GFP_KERNEL);
358 	if (!pr->performance->states) {
359 		result = -ENOMEM;
360 		goto end;
361 	}
362 
363 	for (i = 0; i < pr->performance->state_count; i++) {
364 
365 		struct acpi_processor_px *px = &(pr->performance->states[i]);
366 
367 		state.length = sizeof(struct acpi_processor_px);
368 		state.pointer = px;
369 
370 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
371 
372 		status = acpi_extract_package(&(pss->package.elements[i]),
373 					      &format, &state);
374 		if (ACPI_FAILURE(status)) {
375 			ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
376 			result = -EFAULT;
377 			kfree(pr->performance->states);
378 			goto end;
379 		}
380 
381 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
382 				  "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
383 				  i,
384 				  (u32) px->core_frequency,
385 				  (u32) px->power,
386 				  (u32) px->transition_latency,
387 				  (u32) px->bus_master_latency,
388 				  (u32) px->control, (u32) px->status));
389 
390 		/*
391  		 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
392 		 */
393 		if (!px->core_frequency ||
394 		    ((u32)(px->core_frequency * 1000) !=
395 		     (px->core_frequency * 1000))) {
396 			printk(KERN_ERR FW_BUG PREFIX
397 			       "Invalid BIOS _PSS frequency: 0x%llx MHz\n",
398 			       px->core_frequency);
399 			result = -EFAULT;
400 			kfree(pr->performance->states);
401 			goto end;
402 		}
403 	}
404 
405       end:
406 	kfree(buffer.pointer);
407 
408 	return result;
409 }
410 
411 static int acpi_processor_get_performance_info(struct acpi_processor *pr)
412 {
413 	int result = 0;
414 	acpi_status status = AE_OK;
415 	acpi_handle handle = NULL;
416 
417 	if (!pr || !pr->performance || !pr->handle)
418 		return -EINVAL;
419 
420 	status = acpi_get_handle(pr->handle, "_PCT", &handle);
421 	if (ACPI_FAILURE(status)) {
422 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
423 				  "ACPI-based processor performance control unavailable\n"));
424 		return -ENODEV;
425 	}
426 
427 	result = acpi_processor_get_performance_control(pr);
428 	if (result)
429 		goto update_bios;
430 
431 	result = acpi_processor_get_performance_states(pr);
432 	if (result)
433 		goto update_bios;
434 
435 	/* We need to call _PPC once when cpufreq starts */
436 	if (ignore_ppc != 1)
437 		result = acpi_processor_get_platform_limit(pr);
438 
439 	return result;
440 
441 	/*
442 	 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
443 	 * the BIOS is older than the CPU and does not know its frequencies
444 	 */
445  update_bios:
446 #ifdef CONFIG_X86
447 	if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){
448 		if(boot_cpu_has(X86_FEATURE_EST))
449 			printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
450 			       "frequency support\n");
451 	}
452 #endif
453 	return result;
454 }
455 
456 int acpi_processor_notify_smm(struct module *calling_module)
457 {
458 	acpi_status status;
459 	static int is_done = 0;
460 
461 
462 	if (!(acpi_processor_ppc_status & PPC_REGISTERED))
463 		return -EBUSY;
464 
465 	if (!try_module_get(calling_module))
466 		return -EINVAL;
467 
468 	/* is_done is set to negative if an error occurred,
469 	 * and to postitive if _no_ error occurred, but SMM
470 	 * was already notified. This avoids double notification
471 	 * which might lead to unexpected results...
472 	 */
473 	if (is_done > 0) {
474 		module_put(calling_module);
475 		return 0;
476 	} else if (is_done < 0) {
477 		module_put(calling_module);
478 		return is_done;
479 	}
480 
481 	is_done = -EIO;
482 
483 	/* Can't write pstate_control to smi_command if either value is zero */
484 	if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
485 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
486 		module_put(calling_module);
487 		return 0;
488 	}
489 
490 	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
491 			  "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
492 			  acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
493 
494 	status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
495 				    (u32) acpi_gbl_FADT.pstate_control, 8);
496 	if (ACPI_FAILURE(status)) {
497 		ACPI_EXCEPTION((AE_INFO, status,
498 				"Failed to write pstate_control [0x%x] to "
499 				"smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
500 				acpi_gbl_FADT.smi_command));
501 		module_put(calling_module);
502 		return status;
503 	}
504 
505 	/* Success. If there's no _PPC, we need to fear nothing, so
506 	 * we can allow the cpufreq driver to be rmmod'ed. */
507 	is_done = 1;
508 
509 	if (!(acpi_processor_ppc_status & PPC_IN_USE))
510 		module_put(calling_module);
511 
512 	return 0;
513 }
514 
515 EXPORT_SYMBOL(acpi_processor_notify_smm);
516 
517 static int acpi_processor_get_psd(struct acpi_processor	*pr)
518 {
519 	int result = 0;
520 	acpi_status status = AE_OK;
521 	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
522 	struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
523 	struct acpi_buffer state = {0, NULL};
524 	union acpi_object  *psd = NULL;
525 	struct acpi_psd_package *pdomain;
526 
527 	status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
528 	if (ACPI_FAILURE(status)) {
529 		return -ENODEV;
530 	}
531 
532 	psd = buffer.pointer;
533 	if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
534 		printk(KERN_ERR PREFIX "Invalid _PSD data\n");
535 		result = -EFAULT;
536 		goto end;
537 	}
538 
539 	if (psd->package.count != 1) {
540 		printk(KERN_ERR PREFIX "Invalid _PSD data\n");
541 		result = -EFAULT;
542 		goto end;
543 	}
544 
545 	pdomain = &(pr->performance->domain_info);
546 
547 	state.length = sizeof(struct acpi_psd_package);
548 	state.pointer = pdomain;
549 
550 	status = acpi_extract_package(&(psd->package.elements[0]),
551 		&format, &state);
552 	if (ACPI_FAILURE(status)) {
553 		printk(KERN_ERR PREFIX "Invalid _PSD data\n");
554 		result = -EFAULT;
555 		goto end;
556 	}
557 
558 	if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
559 		printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
560 		result = -EFAULT;
561 		goto end;
562 	}
563 
564 	if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
565 		printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
566 		result = -EFAULT;
567 		goto end;
568 	}
569 
570 	if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
571 	    pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
572 	    pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
573 		printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
574 		result = -EFAULT;
575 		goto end;
576 	}
577 end:
578 	kfree(buffer.pointer);
579 	return result;
580 }
581 
582 int acpi_processor_preregister_performance(
583 		struct acpi_processor_performance __percpu *performance)
584 {
585 	int count, count_target;
586 	int retval = 0;
587 	unsigned int i, j;
588 	cpumask_var_t covered_cpus;
589 	struct acpi_processor *pr;
590 	struct acpi_psd_package *pdomain;
591 	struct acpi_processor *match_pr;
592 	struct acpi_psd_package *match_pdomain;
593 
594 	if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
595 		return -ENOMEM;
596 
597 	mutex_lock(&performance_mutex);
598 
599 	/*
600 	 * Check if another driver has already registered, and abort before
601 	 * changing pr->performance if it has. Check input data as well.
602 	 */
603 	for_each_possible_cpu(i) {
604 		pr = per_cpu(processors, i);
605 		if (!pr) {
606 			/* Look only at processors in ACPI namespace */
607 			continue;
608 		}
609 
610 		if (pr->performance) {
611 			retval = -EBUSY;
612 			goto err_out;
613 		}
614 
615 		if (!performance || !per_cpu_ptr(performance, i)) {
616 			retval = -EINVAL;
617 			goto err_out;
618 		}
619 	}
620 
621 	/* Call _PSD for all CPUs */
622 	for_each_possible_cpu(i) {
623 		pr = per_cpu(processors, i);
624 		if (!pr)
625 			continue;
626 
627 		pr->performance = per_cpu_ptr(performance, i);
628 		cpumask_set_cpu(i, pr->performance->shared_cpu_map);
629 		if (acpi_processor_get_psd(pr)) {
630 			retval = -EINVAL;
631 			continue;
632 		}
633 	}
634 	if (retval)
635 		goto err_ret;
636 
637 	/*
638 	 * Now that we have _PSD data from all CPUs, lets setup P-state
639 	 * domain info.
640 	 */
641 	for_each_possible_cpu(i) {
642 		pr = per_cpu(processors, i);
643 		if (!pr)
644 			continue;
645 
646 		if (cpumask_test_cpu(i, covered_cpus))
647 			continue;
648 
649 		pdomain = &(pr->performance->domain_info);
650 		cpumask_set_cpu(i, pr->performance->shared_cpu_map);
651 		cpumask_set_cpu(i, covered_cpus);
652 		if (pdomain->num_processors <= 1)
653 			continue;
654 
655 		/* Validate the Domain info */
656 		count_target = pdomain->num_processors;
657 		count = 1;
658 		if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
659 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
660 		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
661 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
662 		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
663 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
664 
665 		for_each_possible_cpu(j) {
666 			if (i == j)
667 				continue;
668 
669 			match_pr = per_cpu(processors, j);
670 			if (!match_pr)
671 				continue;
672 
673 			match_pdomain = &(match_pr->performance->domain_info);
674 			if (match_pdomain->domain != pdomain->domain)
675 				continue;
676 
677 			/* Here i and j are in the same domain */
678 
679 			if (match_pdomain->num_processors != count_target) {
680 				retval = -EINVAL;
681 				goto err_ret;
682 			}
683 
684 			if (pdomain->coord_type != match_pdomain->coord_type) {
685 				retval = -EINVAL;
686 				goto err_ret;
687 			}
688 
689 			cpumask_set_cpu(j, covered_cpus);
690 			cpumask_set_cpu(j, pr->performance->shared_cpu_map);
691 			count++;
692 		}
693 
694 		for_each_possible_cpu(j) {
695 			if (i == j)
696 				continue;
697 
698 			match_pr = per_cpu(processors, j);
699 			if (!match_pr)
700 				continue;
701 
702 			match_pdomain = &(match_pr->performance->domain_info);
703 			if (match_pdomain->domain != pdomain->domain)
704 				continue;
705 
706 			match_pr->performance->shared_type =
707 					pr->performance->shared_type;
708 			cpumask_copy(match_pr->performance->shared_cpu_map,
709 				     pr->performance->shared_cpu_map);
710 		}
711 	}
712 
713 err_ret:
714 	for_each_possible_cpu(i) {
715 		pr = per_cpu(processors, i);
716 		if (!pr || !pr->performance)
717 			continue;
718 
719 		/* Assume no coordination on any error parsing domain info */
720 		if (retval) {
721 			cpumask_clear(pr->performance->shared_cpu_map);
722 			cpumask_set_cpu(i, pr->performance->shared_cpu_map);
723 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
724 		}
725 		pr->performance = NULL; /* Will be set for real in register */
726 	}
727 
728 err_out:
729 	mutex_unlock(&performance_mutex);
730 	free_cpumask_var(covered_cpus);
731 	return retval;
732 }
733 EXPORT_SYMBOL(acpi_processor_preregister_performance);
734 
735 int
736 acpi_processor_register_performance(struct acpi_processor_performance
737 				    *performance, unsigned int cpu)
738 {
739 	struct acpi_processor *pr;
740 
741 	if (!(acpi_processor_ppc_status & PPC_REGISTERED))
742 		return -EINVAL;
743 
744 	mutex_lock(&performance_mutex);
745 
746 	pr = per_cpu(processors, cpu);
747 	if (!pr) {
748 		mutex_unlock(&performance_mutex);
749 		return -ENODEV;
750 	}
751 
752 	if (pr->performance) {
753 		mutex_unlock(&performance_mutex);
754 		return -EBUSY;
755 	}
756 
757 	WARN_ON(!performance);
758 
759 	pr->performance = performance;
760 
761 	if (acpi_processor_get_performance_info(pr)) {
762 		pr->performance = NULL;
763 		mutex_unlock(&performance_mutex);
764 		return -EIO;
765 	}
766 
767 	mutex_unlock(&performance_mutex);
768 	return 0;
769 }
770 
771 EXPORT_SYMBOL(acpi_processor_register_performance);
772 
773 void
774 acpi_processor_unregister_performance(struct acpi_processor_performance
775 				      *performance, unsigned int cpu)
776 {
777 	struct acpi_processor *pr;
778 
779 	mutex_lock(&performance_mutex);
780 
781 	pr = per_cpu(processors, cpu);
782 	if (!pr) {
783 		mutex_unlock(&performance_mutex);
784 		return;
785 	}
786 
787 	if (pr->performance)
788 		kfree(pr->performance->states);
789 	pr->performance = NULL;
790 
791 	mutex_unlock(&performance_mutex);
792 
793 	return;
794 }
795 
796 EXPORT_SYMBOL(acpi_processor_unregister_performance);
797