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  */
24 
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/init.h>
28 #include <linux/cpufreq.h>
29 #include <linux/slab.h>
30 #include <linux/acpi.h>
31 #include <acpi/processor.h>
32 #ifdef CONFIG_X86
33 #include <asm/cpufeature.h>
34 #endif
35 
36 #define PREFIX "ACPI: "
37 
38 #define ACPI_PROCESSOR_CLASS		"processor"
39 #define ACPI_PROCESSOR_FILE_PERFORMANCE	"performance"
40 #define _COMPONENT		ACPI_PROCESSOR_COMPONENT
41 ACPI_MODULE_NAME("processor_perflib");
42 
43 static DEFINE_MUTEX(performance_mutex);
44 
45 /*
46  * _PPC support is implemented as a CPUfreq policy notifier:
47  * This means each time a CPUfreq driver registered also with
48  * the ACPI core is asked to change the speed policy, the maximum
49  * value is adjusted so that it is within the platform limit.
50  *
51  * Also, when a new platform limit value is detected, the CPUfreq
52  * policy is adjusted accordingly.
53  */
54 
55 /* ignore_ppc:
56  * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
57  *       ignore _PPC
58  *  0 -> cpufreq low level drivers initialized -> consider _PPC values
59  *  1 -> ignore _PPC totally -> forced by user through boot param
60  */
61 static int ignore_ppc = -1;
62 module_param(ignore_ppc, int, 0644);
63 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
64 		 "limited by BIOS, this should help");
65 
66 #define PPC_REGISTERED   1
67 #define PPC_IN_USE       2
68 
69 static int acpi_processor_ppc_status;
70 
71 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
72 				       unsigned long event, void *data)
73 {
74 	struct cpufreq_policy *policy = data;
75 	struct acpi_processor *pr;
76 	unsigned int ppc = 0;
77 
78 	if (ignore_ppc < 0)
79 		ignore_ppc = 0;
80 
81 	if (ignore_ppc)
82 		return 0;
83 
84 	if (event != CPUFREQ_ADJUST)
85 		return 0;
86 
87 	mutex_lock(&performance_mutex);
88 
89 	pr = per_cpu(processors, policy->cpu);
90 	if (!pr || !pr->performance)
91 		goto out;
92 
93 	ppc = (unsigned int)pr->performance_platform_limit;
94 
95 	if (ppc >= pr->performance->state_count)
96 		goto out;
97 
98 	cpufreq_verify_within_limits(policy, 0,
99 				     pr->performance->states[ppc].
100 				     core_frequency * 1000);
101 
102       out:
103 	mutex_unlock(&performance_mutex);
104 
105 	return 0;
106 }
107 
108 static struct notifier_block acpi_ppc_notifier_block = {
109 	.notifier_call = acpi_processor_ppc_notifier,
110 };
111 
112 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
113 {
114 	acpi_status status = 0;
115 	unsigned long long ppc = 0;
116 
117 
118 	if (!pr)
119 		return -EINVAL;
120 
121 	/*
122 	 * _PPC indicates the maximum state currently supported by the platform
123 	 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
124 	 */
125 	status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
126 
127 	if (status != AE_NOT_FOUND)
128 		acpi_processor_ppc_status |= PPC_IN_USE;
129 
130 	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
131 		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
132 		return -ENODEV;
133 	}
134 
135 	pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
136 		       (int)ppc, ppc ? "" : "not");
137 
138 	pr->performance_platform_limit = (int)ppc;
139 
140 	return 0;
141 }
142 
143 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE	0x80
144 /*
145  * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
146  * @handle: ACPI processor handle
147  * @status: the status code of _PPC evaluation
148  *	0: success. OSPM is now using the performance state specificed.
149  *	1: failure. OSPM has not changed the number of P-states in use
150  */
151 static void acpi_processor_ppc_ost(acpi_handle handle, int status)
152 {
153 	if (acpi_has_method(handle, "_OST"))
154 		acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
155 				  status, NULL);
156 }
157 
158 void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
159 {
160 	int ret;
161 
162 	if (ignore_ppc || !pr->performance) {
163 		/*
164 		 * Only when it is notification event, the _OST object
165 		 * will be evaluated. Otherwise it is skipped.
166 		 */
167 		if (event_flag)
168 			acpi_processor_ppc_ost(pr->handle, 1);
169 		return;
170 	}
171 
172 	ret = acpi_processor_get_platform_limit(pr);
173 	/*
174 	 * Only when it is notification event, the _OST object
175 	 * will be evaluated. Otherwise it is skipped.
176 	 */
177 	if (event_flag) {
178 		if (ret < 0)
179 			acpi_processor_ppc_ost(pr->handle, 1);
180 		else
181 			acpi_processor_ppc_ost(pr->handle, 0);
182 	}
183 	if (ret >= 0)
184 		cpufreq_update_policy(pr->id);
185 }
186 
187 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
188 {
189 	struct acpi_processor *pr;
190 
191 	pr = per_cpu(processors, cpu);
192 	if (!pr || !pr->performance || !pr->performance->state_count)
193 		return -ENODEV;
194 	*limit = pr->performance->states[pr->performance_platform_limit].
195 		core_frequency * 1000;
196 	return 0;
197 }
198 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
199 
200 void acpi_processor_ppc_init(void)
201 {
202 	if (!cpufreq_register_notifier
203 	    (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
204 		acpi_processor_ppc_status |= PPC_REGISTERED;
205 	else
206 		printk(KERN_DEBUG
207 		       "Warning: Processor Platform Limit not supported.\n");
208 }
209 
210 void acpi_processor_ppc_exit(void)
211 {
212 	if (acpi_processor_ppc_status & PPC_REGISTERED)
213 		cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
214 					    CPUFREQ_POLICY_NOTIFIER);
215 
216 	acpi_processor_ppc_status &= ~PPC_REGISTERED;
217 }
218 
219 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
220 {
221 	int result = 0;
222 	acpi_status status = 0;
223 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
224 	union acpi_object *pct = NULL;
225 	union acpi_object obj = { 0 };
226 
227 
228 	status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
229 	if (ACPI_FAILURE(status)) {
230 		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
231 		return -ENODEV;
232 	}
233 
234 	pct = (union acpi_object *)buffer.pointer;
235 	if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
236 	    || (pct->package.count != 2)) {
237 		printk(KERN_ERR PREFIX "Invalid _PCT data\n");
238 		result = -EFAULT;
239 		goto end;
240 	}
241 
242 	/*
243 	 * control_register
244 	 */
245 
246 	obj = pct->package.elements[0];
247 
248 	if ((obj.type != ACPI_TYPE_BUFFER)
249 	    || (obj.buffer.length < sizeof(struct acpi_pct_register))
250 	    || (obj.buffer.pointer == NULL)) {
251 		printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
252 		result = -EFAULT;
253 		goto end;
254 	}
255 	memcpy(&pr->performance->control_register, obj.buffer.pointer,
256 	       sizeof(struct acpi_pct_register));
257 
258 	/*
259 	 * status_register
260 	 */
261 
262 	obj = pct->package.elements[1];
263 
264 	if ((obj.type != ACPI_TYPE_BUFFER)
265 	    || (obj.buffer.length < sizeof(struct acpi_pct_register))
266 	    || (obj.buffer.pointer == NULL)) {
267 		printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
268 		result = -EFAULT;
269 		goto end;
270 	}
271 
272 	memcpy(&pr->performance->status_register, obj.buffer.pointer,
273 	       sizeof(struct acpi_pct_register));
274 
275       end:
276 	kfree(buffer.pointer);
277 
278 	return result;
279 }
280 
281 #ifdef CONFIG_X86
282 /*
283  * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
284  * in their ACPI data. Calculate the real values and fix up the _PSS data.
285  */
286 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
287 {
288 	u32 hi, lo, fid, did;
289 	int index = px->control & 0x00000007;
290 
291 	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
292 		return;
293 
294 	if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
295 	    || boot_cpu_data.x86 == 0x11) {
296 		rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
297 		/*
298 		 * MSR C001_0064+:
299 		 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
300 		 */
301 		if (!(hi & BIT(31)))
302 			return;
303 
304 		fid = lo & 0x3f;
305 		did = (lo >> 6) & 7;
306 		if (boot_cpu_data.x86 == 0x10)
307 			px->core_frequency = (100 * (fid + 0x10)) >> did;
308 		else
309 			px->core_frequency = (100 * (fid + 8)) >> did;
310 	}
311 }
312 #else
313 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
314 #endif
315 
316 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
317 {
318 	int result = 0;
319 	acpi_status status = AE_OK;
320 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
321 	struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
322 	struct acpi_buffer state = { 0, NULL };
323 	union acpi_object *pss = NULL;
324 	int i;
325 	int last_invalid = -1;
326 
327 
328 	status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
329 	if (ACPI_FAILURE(status)) {
330 		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
331 		return -ENODEV;
332 	}
333 
334 	pss = buffer.pointer;
335 	if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
336 		printk(KERN_ERR PREFIX "Invalid _PSS data\n");
337 		result = -EFAULT;
338 		goto end;
339 	}
340 
341 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
342 			  pss->package.count));
343 
344 	pr->performance->state_count = pss->package.count;
345 	pr->performance->states =
346 	    kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
347 		    GFP_KERNEL);
348 	if (!pr->performance->states) {
349 		result = -ENOMEM;
350 		goto end;
351 	}
352 
353 	for (i = 0; i < pr->performance->state_count; i++) {
354 
355 		struct acpi_processor_px *px = &(pr->performance->states[i]);
356 
357 		state.length = sizeof(struct acpi_processor_px);
358 		state.pointer = px;
359 
360 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
361 
362 		status = acpi_extract_package(&(pss->package.elements[i]),
363 					      &format, &state);
364 		if (ACPI_FAILURE(status)) {
365 			ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
366 			result = -EFAULT;
367 			kfree(pr->performance->states);
368 			goto end;
369 		}
370 
371 		amd_fixup_frequency(px, i);
372 
373 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
374 				  "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
375 				  i,
376 				  (u32) px->core_frequency,
377 				  (u32) px->power,
378 				  (u32) px->transition_latency,
379 				  (u32) px->bus_master_latency,
380 				  (u32) px->control, (u32) px->status));
381 
382 		/*
383  		 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
384 		 */
385 		if (!px->core_frequency ||
386 		    ((u32)(px->core_frequency * 1000) !=
387 		     (px->core_frequency * 1000))) {
388 			printk(KERN_ERR FW_BUG PREFIX
389 			       "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
390 			       pr->id, px->core_frequency);
391 			if (last_invalid == -1)
392 				last_invalid = i;
393 		} else {
394 			if (last_invalid != -1) {
395 				/*
396 				 * Copy this valid entry over last_invalid entry
397 				 */
398 				memcpy(&(pr->performance->states[last_invalid]),
399 				       px, sizeof(struct acpi_processor_px));
400 				++last_invalid;
401 			}
402 		}
403 	}
404 
405 	if (last_invalid == 0) {
406 		printk(KERN_ERR FW_BUG PREFIX
407 		       "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
408 		result = -EFAULT;
409 		kfree(pr->performance->states);
410 		pr->performance->states = NULL;
411 	}
412 
413 	if (last_invalid > 0)
414 		pr->performance->state_count = last_invalid;
415 
416       end:
417 	kfree(buffer.pointer);
418 
419 	return result;
420 }
421 
422 int acpi_processor_get_performance_info(struct acpi_processor *pr)
423 {
424 	int result = 0;
425 
426 	if (!pr || !pr->performance || !pr->handle)
427 		return -EINVAL;
428 
429 	if (!acpi_has_method(pr->handle, "_PCT")) {
430 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
431 				  "ACPI-based processor performance control unavailable\n"));
432 		return -ENODEV;
433 	}
434 
435 	result = acpi_processor_get_performance_control(pr);
436 	if (result)
437 		goto update_bios;
438 
439 	result = acpi_processor_get_performance_states(pr);
440 	if (result)
441 		goto update_bios;
442 
443 	/* We need to call _PPC once when cpufreq starts */
444 	if (ignore_ppc != 1)
445 		result = acpi_processor_get_platform_limit(pr);
446 
447 	return result;
448 
449 	/*
450 	 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
451 	 * the BIOS is older than the CPU and does not know its frequencies
452 	 */
453  update_bios:
454 #ifdef CONFIG_X86
455 	if (acpi_has_method(pr->handle, "_PPC")) {
456 		if(boot_cpu_has(X86_FEATURE_EST))
457 			printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
458 			       "frequency support\n");
459 	}
460 #endif
461 	return result;
462 }
463 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
464 
465 int acpi_processor_pstate_control(void)
466 {
467 	acpi_status status;
468 
469 	if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
470 		return 0;
471 
472 	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
473 			  "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
474 			  acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
475 
476 	status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
477 				    (u32)acpi_gbl_FADT.pstate_control, 8);
478 	if (ACPI_SUCCESS(status))
479 		return 1;
480 
481 	ACPI_EXCEPTION((AE_INFO, status,
482 			"Failed to write pstate_control [0x%x] to smi_command [0x%x]",
483 			acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
484 	return -EIO;
485 }
486 
487 int acpi_processor_notify_smm(struct module *calling_module)
488 {
489 	static int is_done = 0;
490 	int result;
491 
492 	if (!(acpi_processor_ppc_status & PPC_REGISTERED))
493 		return -EBUSY;
494 
495 	if (!try_module_get(calling_module))
496 		return -EINVAL;
497 
498 	/* is_done is set to negative if an error occurred,
499 	 * and to postitive if _no_ error occurred, but SMM
500 	 * was already notified. This avoids double notification
501 	 * which might lead to unexpected results...
502 	 */
503 	if (is_done > 0) {
504 		module_put(calling_module);
505 		return 0;
506 	} else if (is_done < 0) {
507 		module_put(calling_module);
508 		return is_done;
509 	}
510 
511 	is_done = -EIO;
512 
513 	result = acpi_processor_pstate_control();
514 	if (!result) {
515 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
516 		module_put(calling_module);
517 		return 0;
518 	}
519 	if (result < 0) {
520 		module_put(calling_module);
521 		return result;
522 	}
523 
524 	/* Success. If there's no _PPC, we need to fear nothing, so
525 	 * we can allow the cpufreq driver to be rmmod'ed. */
526 	is_done = 1;
527 
528 	if (!(acpi_processor_ppc_status & PPC_IN_USE))
529 		module_put(calling_module);
530 
531 	return 0;
532 }
533 
534 EXPORT_SYMBOL(acpi_processor_notify_smm);
535 
536 static int acpi_processor_get_psd(struct acpi_processor	*pr)
537 {
538 	int result = 0;
539 	acpi_status status = AE_OK;
540 	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
541 	struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
542 	struct acpi_buffer state = {0, NULL};
543 	union acpi_object  *psd = NULL;
544 	struct acpi_psd_package *pdomain;
545 
546 	status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
547 	if (ACPI_FAILURE(status)) {
548 		return -ENODEV;
549 	}
550 
551 	psd = buffer.pointer;
552 	if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
553 		printk(KERN_ERR PREFIX "Invalid _PSD data\n");
554 		result = -EFAULT;
555 		goto end;
556 	}
557 
558 	if (psd->package.count != 1) {
559 		printk(KERN_ERR PREFIX "Invalid _PSD data\n");
560 		result = -EFAULT;
561 		goto end;
562 	}
563 
564 	pdomain = &(pr->performance->domain_info);
565 
566 	state.length = sizeof(struct acpi_psd_package);
567 	state.pointer = pdomain;
568 
569 	status = acpi_extract_package(&(psd->package.elements[0]),
570 		&format, &state);
571 	if (ACPI_FAILURE(status)) {
572 		printk(KERN_ERR PREFIX "Invalid _PSD data\n");
573 		result = -EFAULT;
574 		goto end;
575 	}
576 
577 	if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
578 		printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
579 		result = -EFAULT;
580 		goto end;
581 	}
582 
583 	if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
584 		printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
585 		result = -EFAULT;
586 		goto end;
587 	}
588 
589 	if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
590 	    pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
591 	    pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
592 		printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
593 		result = -EFAULT;
594 		goto end;
595 	}
596 end:
597 	kfree(buffer.pointer);
598 	return result;
599 }
600 
601 int acpi_processor_preregister_performance(
602 		struct acpi_processor_performance __percpu *performance)
603 {
604 	int count_target;
605 	int retval = 0;
606 	unsigned int i, j;
607 	cpumask_var_t covered_cpus;
608 	struct acpi_processor *pr;
609 	struct acpi_psd_package *pdomain;
610 	struct acpi_processor *match_pr;
611 	struct acpi_psd_package *match_pdomain;
612 
613 	if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
614 		return -ENOMEM;
615 
616 	mutex_lock(&performance_mutex);
617 
618 	/*
619 	 * Check if another driver has already registered, and abort before
620 	 * changing pr->performance if it has. Check input data as well.
621 	 */
622 	for_each_possible_cpu(i) {
623 		pr = per_cpu(processors, i);
624 		if (!pr) {
625 			/* Look only at processors in ACPI namespace */
626 			continue;
627 		}
628 
629 		if (pr->performance) {
630 			retval = -EBUSY;
631 			goto err_out;
632 		}
633 
634 		if (!performance || !per_cpu_ptr(performance, i)) {
635 			retval = -EINVAL;
636 			goto err_out;
637 		}
638 	}
639 
640 	/* Call _PSD for all CPUs */
641 	for_each_possible_cpu(i) {
642 		pr = per_cpu(processors, i);
643 		if (!pr)
644 			continue;
645 
646 		pr->performance = per_cpu_ptr(performance, i);
647 		cpumask_set_cpu(i, pr->performance->shared_cpu_map);
648 		if (acpi_processor_get_psd(pr)) {
649 			retval = -EINVAL;
650 			continue;
651 		}
652 	}
653 	if (retval)
654 		goto err_ret;
655 
656 	/*
657 	 * Now that we have _PSD data from all CPUs, lets setup P-state
658 	 * domain info.
659 	 */
660 	for_each_possible_cpu(i) {
661 		pr = per_cpu(processors, i);
662 		if (!pr)
663 			continue;
664 
665 		if (cpumask_test_cpu(i, covered_cpus))
666 			continue;
667 
668 		pdomain = &(pr->performance->domain_info);
669 		cpumask_set_cpu(i, pr->performance->shared_cpu_map);
670 		cpumask_set_cpu(i, covered_cpus);
671 		if (pdomain->num_processors <= 1)
672 			continue;
673 
674 		/* Validate the Domain info */
675 		count_target = pdomain->num_processors;
676 		if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
677 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
678 		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
679 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
680 		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
681 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
682 
683 		for_each_possible_cpu(j) {
684 			if (i == j)
685 				continue;
686 
687 			match_pr = per_cpu(processors, j);
688 			if (!match_pr)
689 				continue;
690 
691 			match_pdomain = &(match_pr->performance->domain_info);
692 			if (match_pdomain->domain != pdomain->domain)
693 				continue;
694 
695 			/* Here i and j are in the same domain */
696 
697 			if (match_pdomain->num_processors != count_target) {
698 				retval = -EINVAL;
699 				goto err_ret;
700 			}
701 
702 			if (pdomain->coord_type != match_pdomain->coord_type) {
703 				retval = -EINVAL;
704 				goto err_ret;
705 			}
706 
707 			cpumask_set_cpu(j, covered_cpus);
708 			cpumask_set_cpu(j, pr->performance->shared_cpu_map);
709 		}
710 
711 		for_each_possible_cpu(j) {
712 			if (i == j)
713 				continue;
714 
715 			match_pr = per_cpu(processors, j);
716 			if (!match_pr)
717 				continue;
718 
719 			match_pdomain = &(match_pr->performance->domain_info);
720 			if (match_pdomain->domain != pdomain->domain)
721 				continue;
722 
723 			match_pr->performance->shared_type =
724 					pr->performance->shared_type;
725 			cpumask_copy(match_pr->performance->shared_cpu_map,
726 				     pr->performance->shared_cpu_map);
727 		}
728 	}
729 
730 err_ret:
731 	for_each_possible_cpu(i) {
732 		pr = per_cpu(processors, i);
733 		if (!pr || !pr->performance)
734 			continue;
735 
736 		/* Assume no coordination on any error parsing domain info */
737 		if (retval) {
738 			cpumask_clear(pr->performance->shared_cpu_map);
739 			cpumask_set_cpu(i, pr->performance->shared_cpu_map);
740 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
741 		}
742 		pr->performance = NULL; /* Will be set for real in register */
743 	}
744 
745 err_out:
746 	mutex_unlock(&performance_mutex);
747 	free_cpumask_var(covered_cpus);
748 	return retval;
749 }
750 EXPORT_SYMBOL(acpi_processor_preregister_performance);
751 
752 int
753 acpi_processor_register_performance(struct acpi_processor_performance
754 				    *performance, unsigned int cpu)
755 {
756 	struct acpi_processor *pr;
757 
758 	if (!(acpi_processor_ppc_status & PPC_REGISTERED))
759 		return -EINVAL;
760 
761 	mutex_lock(&performance_mutex);
762 
763 	pr = per_cpu(processors, cpu);
764 	if (!pr) {
765 		mutex_unlock(&performance_mutex);
766 		return -ENODEV;
767 	}
768 
769 	if (pr->performance) {
770 		mutex_unlock(&performance_mutex);
771 		return -EBUSY;
772 	}
773 
774 	WARN_ON(!performance);
775 
776 	pr->performance = performance;
777 
778 	if (acpi_processor_get_performance_info(pr)) {
779 		pr->performance = NULL;
780 		mutex_unlock(&performance_mutex);
781 		return -EIO;
782 	}
783 
784 	mutex_unlock(&performance_mutex);
785 	return 0;
786 }
787 
788 EXPORT_SYMBOL(acpi_processor_register_performance);
789 
790 void acpi_processor_unregister_performance(unsigned int cpu)
791 {
792 	struct acpi_processor *pr;
793 
794 	mutex_lock(&performance_mutex);
795 
796 	pr = per_cpu(processors, cpu);
797 	if (!pr) {
798 		mutex_unlock(&performance_mutex);
799 		return;
800 	}
801 
802 	if (pr->performance)
803 		kfree(pr->performance->states);
804 	pr->performance = NULL;
805 
806 	mutex_unlock(&performance_mutex);
807 
808 	return;
809 }
810 
811 EXPORT_SYMBOL(acpi_processor_unregister_performance);
812