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 (event == CPUFREQ_START && ignore_ppc <= 0) {
79 		ignore_ppc = 0;
80 		return 0;
81 	}
82 
83 	if (ignore_ppc)
84 		return 0;
85 
86 	if (event != CPUFREQ_ADJUST)
87 		return 0;
88 
89 	mutex_lock(&performance_mutex);
90 
91 	pr = per_cpu(processors, policy->cpu);
92 	if (!pr || !pr->performance)
93 		goto out;
94 
95 	ppc = (unsigned int)pr->performance_platform_limit;
96 
97 	if (ppc >= pr->performance->state_count)
98 		goto out;
99 
100 	cpufreq_verify_within_limits(policy, 0,
101 				     pr->performance->states[ppc].
102 				     core_frequency * 1000);
103 
104       out:
105 	mutex_unlock(&performance_mutex);
106 
107 	return 0;
108 }
109 
110 static struct notifier_block acpi_ppc_notifier_block = {
111 	.notifier_call = acpi_processor_ppc_notifier,
112 };
113 
114 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
115 {
116 	acpi_status status = 0;
117 	unsigned long long ppc = 0;
118 
119 
120 	if (!pr)
121 		return -EINVAL;
122 
123 	/*
124 	 * _PPC indicates the maximum state currently supported by the platform
125 	 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
126 	 */
127 	status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
128 
129 	if (status != AE_NOT_FOUND)
130 		acpi_processor_ppc_status |= PPC_IN_USE;
131 
132 	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
133 		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
134 		return -ENODEV;
135 	}
136 
137 	pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
138 		       (int)ppc, ppc ? "" : "not");
139 
140 	pr->performance_platform_limit = (int)ppc;
141 
142 	return 0;
143 }
144 
145 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE	0x80
146 /*
147  * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
148  * @handle: ACPI processor handle
149  * @status: the status code of _PPC evaluation
150  *	0: success. OSPM is now using the performance state specificed.
151  *	1: failure. OSPM has not changed the number of P-states in use
152  */
153 static void acpi_processor_ppc_ost(acpi_handle handle, int status)
154 {
155 	if (acpi_has_method(handle, "_OST"))
156 		acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
157 				  status, NULL);
158 }
159 
160 void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
161 {
162 	int ret;
163 
164 	if (ignore_ppc) {
165 		/*
166 		 * Only when it is notification event, the _OST object
167 		 * will be evaluated. Otherwise it is skipped.
168 		 */
169 		if (event_flag)
170 			acpi_processor_ppc_ost(pr->handle, 1);
171 		return;
172 	}
173 
174 	ret = acpi_processor_get_platform_limit(pr);
175 	/*
176 	 * Only when it is notification event, the _OST object
177 	 * will be evaluated. Otherwise it is skipped.
178 	 */
179 	if (event_flag) {
180 		if (ret < 0)
181 			acpi_processor_ppc_ost(pr->handle, 1);
182 		else
183 			acpi_processor_ppc_ost(pr->handle, 0);
184 	}
185 	if (ret >= 0)
186 		cpufreq_update_policy(pr->id);
187 }
188 
189 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
190 {
191 	struct acpi_processor *pr;
192 
193 	pr = per_cpu(processors, cpu);
194 	if (!pr || !pr->performance || !pr->performance->state_count)
195 		return -ENODEV;
196 	*limit = pr->performance->states[pr->performance_platform_limit].
197 		core_frequency * 1000;
198 	return 0;
199 }
200 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
201 
202 void acpi_processor_ppc_init(void)
203 {
204 	if (!cpufreq_register_notifier
205 	    (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
206 		acpi_processor_ppc_status |= PPC_REGISTERED;
207 	else
208 		printk(KERN_DEBUG
209 		       "Warning: Processor Platform Limit not supported.\n");
210 }
211 
212 void acpi_processor_ppc_exit(void)
213 {
214 	if (acpi_processor_ppc_status & PPC_REGISTERED)
215 		cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
216 					    CPUFREQ_POLICY_NOTIFIER);
217 
218 	acpi_processor_ppc_status &= ~PPC_REGISTERED;
219 }
220 
221 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
222 {
223 	int result = 0;
224 	acpi_status status = 0;
225 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
226 	union acpi_object *pct = NULL;
227 	union acpi_object obj = { 0 };
228 
229 
230 	status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
231 	if (ACPI_FAILURE(status)) {
232 		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
233 		return -ENODEV;
234 	}
235 
236 	pct = (union acpi_object *)buffer.pointer;
237 	if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
238 	    || (pct->package.count != 2)) {
239 		printk(KERN_ERR PREFIX "Invalid _PCT data\n");
240 		result = -EFAULT;
241 		goto end;
242 	}
243 
244 	/*
245 	 * control_register
246 	 */
247 
248 	obj = pct->package.elements[0];
249 
250 	if ((obj.type != ACPI_TYPE_BUFFER)
251 	    || (obj.buffer.length < sizeof(struct acpi_pct_register))
252 	    || (obj.buffer.pointer == NULL)) {
253 		printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
254 		result = -EFAULT;
255 		goto end;
256 	}
257 	memcpy(&pr->performance->control_register, obj.buffer.pointer,
258 	       sizeof(struct acpi_pct_register));
259 
260 	/*
261 	 * status_register
262 	 */
263 
264 	obj = pct->package.elements[1];
265 
266 	if ((obj.type != ACPI_TYPE_BUFFER)
267 	    || (obj.buffer.length < sizeof(struct acpi_pct_register))
268 	    || (obj.buffer.pointer == NULL)) {
269 		printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
270 		result = -EFAULT;
271 		goto end;
272 	}
273 
274 	memcpy(&pr->performance->status_register, obj.buffer.pointer,
275 	       sizeof(struct acpi_pct_register));
276 
277       end:
278 	kfree(buffer.pointer);
279 
280 	return result;
281 }
282 
283 #ifdef CONFIG_X86
284 /*
285  * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
286  * in their ACPI data. Calculate the real values and fix up the _PSS data.
287  */
288 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
289 {
290 	u32 hi, lo, fid, did;
291 	int index = px->control & 0x00000007;
292 
293 	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
294 		return;
295 
296 	if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
297 	    || boot_cpu_data.x86 == 0x11) {
298 		rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
299 		/*
300 		 * MSR C001_0064+:
301 		 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
302 		 */
303 		if (!(hi & BIT(31)))
304 			return;
305 
306 		fid = lo & 0x3f;
307 		did = (lo >> 6) & 7;
308 		if (boot_cpu_data.x86 == 0x10)
309 			px->core_frequency = (100 * (fid + 0x10)) >> did;
310 		else
311 			px->core_frequency = (100 * (fid + 8)) >> did;
312 	}
313 }
314 #else
315 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
316 #endif
317 
318 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
319 {
320 	int result = 0;
321 	acpi_status status = AE_OK;
322 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
323 	struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
324 	struct acpi_buffer state = { 0, NULL };
325 	union acpi_object *pss = NULL;
326 	int i;
327 	int last_invalid = -1;
328 
329 
330 	status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
331 	if (ACPI_FAILURE(status)) {
332 		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
333 		return -ENODEV;
334 	}
335 
336 	pss = buffer.pointer;
337 	if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
338 		printk(KERN_ERR PREFIX "Invalid _PSS data\n");
339 		result = -EFAULT;
340 		goto end;
341 	}
342 
343 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
344 			  pss->package.count));
345 
346 	pr->performance->state_count = pss->package.count;
347 	pr->performance->states =
348 	    kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
349 		    GFP_KERNEL);
350 	if (!pr->performance->states) {
351 		result = -ENOMEM;
352 		goto end;
353 	}
354 
355 	for (i = 0; i < pr->performance->state_count; i++) {
356 
357 		struct acpi_processor_px *px = &(pr->performance->states[i]);
358 
359 		state.length = sizeof(struct acpi_processor_px);
360 		state.pointer = px;
361 
362 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
363 
364 		status = acpi_extract_package(&(pss->package.elements[i]),
365 					      &format, &state);
366 		if (ACPI_FAILURE(status)) {
367 			ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
368 			result = -EFAULT;
369 			kfree(pr->performance->states);
370 			goto end;
371 		}
372 
373 		amd_fixup_frequency(px, i);
374 
375 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
376 				  "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
377 				  i,
378 				  (u32) px->core_frequency,
379 				  (u32) px->power,
380 				  (u32) px->transition_latency,
381 				  (u32) px->bus_master_latency,
382 				  (u32) px->control, (u32) px->status));
383 
384 		/*
385  		 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
386 		 */
387 		if (!px->core_frequency ||
388 		    ((u32)(px->core_frequency * 1000) !=
389 		     (px->core_frequency * 1000))) {
390 			printk(KERN_ERR FW_BUG PREFIX
391 			       "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
392 			       pr->id, px->core_frequency);
393 			if (last_invalid == -1)
394 				last_invalid = i;
395 		} else {
396 			if (last_invalid != -1) {
397 				/*
398 				 * Copy this valid entry over last_invalid entry
399 				 */
400 				memcpy(&(pr->performance->states[last_invalid]),
401 				       px, sizeof(struct acpi_processor_px));
402 				++last_invalid;
403 			}
404 		}
405 	}
406 
407 	if (last_invalid == 0) {
408 		printk(KERN_ERR FW_BUG PREFIX
409 		       "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
410 		result = -EFAULT;
411 		kfree(pr->performance->states);
412 		pr->performance->states = NULL;
413 	}
414 
415 	if (last_invalid > 0)
416 		pr->performance->state_count = last_invalid;
417 
418       end:
419 	kfree(buffer.pointer);
420 
421 	return result;
422 }
423 
424 int acpi_processor_get_performance_info(struct acpi_processor *pr)
425 {
426 	int result = 0;
427 
428 	if (!pr || !pr->performance || !pr->handle)
429 		return -EINVAL;
430 
431 	if (!acpi_has_method(pr->handle, "_PCT")) {
432 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
433 				  "ACPI-based processor performance control unavailable\n"));
434 		return -ENODEV;
435 	}
436 
437 	result = acpi_processor_get_performance_control(pr);
438 	if (result)
439 		goto update_bios;
440 
441 	result = acpi_processor_get_performance_states(pr);
442 	if (result)
443 		goto update_bios;
444 
445 	/* We need to call _PPC once when cpufreq starts */
446 	if (ignore_ppc != 1)
447 		result = acpi_processor_get_platform_limit(pr);
448 
449 	return result;
450 
451 	/*
452 	 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
453 	 * the BIOS is older than the CPU and does not know its frequencies
454 	 */
455  update_bios:
456 #ifdef CONFIG_X86
457 	if (acpi_has_method(pr->handle, "_PPC")) {
458 		if(boot_cpu_has(X86_FEATURE_EST))
459 			printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
460 			       "frequency support\n");
461 	}
462 #endif
463 	return result;
464 }
465 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
466 
467 int acpi_processor_pstate_control(void)
468 {
469 	acpi_status status;
470 
471 	if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
472 		return 0;
473 
474 	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
475 			  "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
476 			  acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
477 
478 	status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
479 				    (u32)acpi_gbl_FADT.pstate_control, 8);
480 	if (ACPI_SUCCESS(status))
481 		return 1;
482 
483 	ACPI_EXCEPTION((AE_INFO, status,
484 			"Failed to write pstate_control [0x%x] to smi_command [0x%x]",
485 			acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
486 	return -EIO;
487 }
488 
489 int acpi_processor_notify_smm(struct module *calling_module)
490 {
491 	static int is_done = 0;
492 	int result;
493 
494 	if (!(acpi_processor_ppc_status & PPC_REGISTERED))
495 		return -EBUSY;
496 
497 	if (!try_module_get(calling_module))
498 		return -EINVAL;
499 
500 	/* is_done is set to negative if an error occurred,
501 	 * and to postitive if _no_ error occurred, but SMM
502 	 * was already notified. This avoids double notification
503 	 * which might lead to unexpected results...
504 	 */
505 	if (is_done > 0) {
506 		module_put(calling_module);
507 		return 0;
508 	} else if (is_done < 0) {
509 		module_put(calling_module);
510 		return is_done;
511 	}
512 
513 	is_done = -EIO;
514 
515 	result = acpi_processor_pstate_control();
516 	if (!result) {
517 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
518 		module_put(calling_module);
519 		return 0;
520 	}
521 	if (result < 0) {
522 		module_put(calling_module);
523 		return result;
524 	}
525 
526 	/* Success. If there's no _PPC, we need to fear nothing, so
527 	 * we can allow the cpufreq driver to be rmmod'ed. */
528 	is_done = 1;
529 
530 	if (!(acpi_processor_ppc_status & PPC_IN_USE))
531 		module_put(calling_module);
532 
533 	return 0;
534 }
535 
536 EXPORT_SYMBOL(acpi_processor_notify_smm);
537 
538 static int acpi_processor_get_psd(struct acpi_processor	*pr)
539 {
540 	int result = 0;
541 	acpi_status status = AE_OK;
542 	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
543 	struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
544 	struct acpi_buffer state = {0, NULL};
545 	union acpi_object  *psd = NULL;
546 	struct acpi_psd_package *pdomain;
547 
548 	status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
549 	if (ACPI_FAILURE(status)) {
550 		return -ENODEV;
551 	}
552 
553 	psd = buffer.pointer;
554 	if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
555 		printk(KERN_ERR PREFIX "Invalid _PSD data\n");
556 		result = -EFAULT;
557 		goto end;
558 	}
559 
560 	if (psd->package.count != 1) {
561 		printk(KERN_ERR PREFIX "Invalid _PSD data\n");
562 		result = -EFAULT;
563 		goto end;
564 	}
565 
566 	pdomain = &(pr->performance->domain_info);
567 
568 	state.length = sizeof(struct acpi_psd_package);
569 	state.pointer = pdomain;
570 
571 	status = acpi_extract_package(&(psd->package.elements[0]),
572 		&format, &state);
573 	if (ACPI_FAILURE(status)) {
574 		printk(KERN_ERR PREFIX "Invalid _PSD data\n");
575 		result = -EFAULT;
576 		goto end;
577 	}
578 
579 	if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
580 		printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
581 		result = -EFAULT;
582 		goto end;
583 	}
584 
585 	if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
586 		printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
587 		result = -EFAULT;
588 		goto end;
589 	}
590 
591 	if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
592 	    pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
593 	    pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
594 		printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
595 		result = -EFAULT;
596 		goto end;
597 	}
598 end:
599 	kfree(buffer.pointer);
600 	return result;
601 }
602 
603 int acpi_processor_preregister_performance(
604 		struct acpi_processor_performance __percpu *performance)
605 {
606 	int count_target;
607 	int retval = 0;
608 	unsigned int i, j;
609 	cpumask_var_t covered_cpus;
610 	struct acpi_processor *pr;
611 	struct acpi_psd_package *pdomain;
612 	struct acpi_processor *match_pr;
613 	struct acpi_psd_package *match_pdomain;
614 
615 	if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
616 		return -ENOMEM;
617 
618 	mutex_lock(&performance_mutex);
619 
620 	/*
621 	 * Check if another driver has already registered, and abort before
622 	 * changing pr->performance if it has. Check input data as well.
623 	 */
624 	for_each_possible_cpu(i) {
625 		pr = per_cpu(processors, i);
626 		if (!pr) {
627 			/* Look only at processors in ACPI namespace */
628 			continue;
629 		}
630 
631 		if (pr->performance) {
632 			retval = -EBUSY;
633 			goto err_out;
634 		}
635 
636 		if (!performance || !per_cpu_ptr(performance, i)) {
637 			retval = -EINVAL;
638 			goto err_out;
639 		}
640 	}
641 
642 	/* Call _PSD for all CPUs */
643 	for_each_possible_cpu(i) {
644 		pr = per_cpu(processors, i);
645 		if (!pr)
646 			continue;
647 
648 		pr->performance = per_cpu_ptr(performance, i);
649 		cpumask_set_cpu(i, pr->performance->shared_cpu_map);
650 		if (acpi_processor_get_psd(pr)) {
651 			retval = -EINVAL;
652 			continue;
653 		}
654 	}
655 	if (retval)
656 		goto err_ret;
657 
658 	/*
659 	 * Now that we have _PSD data from all CPUs, lets setup P-state
660 	 * domain info.
661 	 */
662 	for_each_possible_cpu(i) {
663 		pr = per_cpu(processors, i);
664 		if (!pr)
665 			continue;
666 
667 		if (cpumask_test_cpu(i, covered_cpus))
668 			continue;
669 
670 		pdomain = &(pr->performance->domain_info);
671 		cpumask_set_cpu(i, pr->performance->shared_cpu_map);
672 		cpumask_set_cpu(i, covered_cpus);
673 		if (pdomain->num_processors <= 1)
674 			continue;
675 
676 		/* Validate the Domain info */
677 		count_target = pdomain->num_processors;
678 		if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
679 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
680 		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
681 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
682 		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
683 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
684 
685 		for_each_possible_cpu(j) {
686 			if (i == j)
687 				continue;
688 
689 			match_pr = per_cpu(processors, j);
690 			if (!match_pr)
691 				continue;
692 
693 			match_pdomain = &(match_pr->performance->domain_info);
694 			if (match_pdomain->domain != pdomain->domain)
695 				continue;
696 
697 			/* Here i and j are in the same domain */
698 
699 			if (match_pdomain->num_processors != count_target) {
700 				retval = -EINVAL;
701 				goto err_ret;
702 			}
703 
704 			if (pdomain->coord_type != match_pdomain->coord_type) {
705 				retval = -EINVAL;
706 				goto err_ret;
707 			}
708 
709 			cpumask_set_cpu(j, covered_cpus);
710 			cpumask_set_cpu(j, pr->performance->shared_cpu_map);
711 		}
712 
713 		for_each_possible_cpu(j) {
714 			if (i == j)
715 				continue;
716 
717 			match_pr = per_cpu(processors, j);
718 			if (!match_pr)
719 				continue;
720 
721 			match_pdomain = &(match_pr->performance->domain_info);
722 			if (match_pdomain->domain != pdomain->domain)
723 				continue;
724 
725 			match_pr->performance->shared_type =
726 					pr->performance->shared_type;
727 			cpumask_copy(match_pr->performance->shared_cpu_map,
728 				     pr->performance->shared_cpu_map);
729 		}
730 	}
731 
732 err_ret:
733 	for_each_possible_cpu(i) {
734 		pr = per_cpu(processors, i);
735 		if (!pr || !pr->performance)
736 			continue;
737 
738 		/* Assume no coordination on any error parsing domain info */
739 		if (retval) {
740 			cpumask_clear(pr->performance->shared_cpu_map);
741 			cpumask_set_cpu(i, pr->performance->shared_cpu_map);
742 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
743 		}
744 		pr->performance = NULL; /* Will be set for real in register */
745 	}
746 
747 err_out:
748 	mutex_unlock(&performance_mutex);
749 	free_cpumask_var(covered_cpus);
750 	return retval;
751 }
752 EXPORT_SYMBOL(acpi_processor_preregister_performance);
753 
754 int
755 acpi_processor_register_performance(struct acpi_processor_performance
756 				    *performance, unsigned int cpu)
757 {
758 	struct acpi_processor *pr;
759 
760 	if (!(acpi_processor_ppc_status & PPC_REGISTERED))
761 		return -EINVAL;
762 
763 	mutex_lock(&performance_mutex);
764 
765 	pr = per_cpu(processors, cpu);
766 	if (!pr) {
767 		mutex_unlock(&performance_mutex);
768 		return -ENODEV;
769 	}
770 
771 	if (pr->performance) {
772 		mutex_unlock(&performance_mutex);
773 		return -EBUSY;
774 	}
775 
776 	WARN_ON(!performance);
777 
778 	pr->performance = performance;
779 
780 	if (acpi_processor_get_performance_info(pr)) {
781 		pr->performance = NULL;
782 		mutex_unlock(&performance_mutex);
783 		return -EIO;
784 	}
785 
786 	mutex_unlock(&performance_mutex);
787 	return 0;
788 }
789 
790 EXPORT_SYMBOL(acpi_processor_register_performance);
791 
792 void acpi_processor_unregister_performance(unsigned int cpu)
793 {
794 	struct acpi_processor *pr;
795 
796 	mutex_lock(&performance_mutex);
797 
798 	pr = per_cpu(processors, cpu);
799 	if (!pr) {
800 		mutex_unlock(&performance_mutex);
801 		return;
802 	}
803 
804 	if (pr->performance)
805 		kfree(pr->performance->states);
806 	pr->performance = NULL;
807 
808 	mutex_unlock(&performance_mutex);
809 
810 	return;
811 }
812 
813 EXPORT_SYMBOL(acpi_processor_unregister_performance);
814