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 
34 #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
35 #include <linux/proc_fs.h>
36 #include <linux/seq_file.h>
37 #include <linux/mutex.h>
38 
39 #include <asm/uaccess.h>
40 #endif
41 
42 #include <acpi/acpi_bus.h>
43 #include <acpi/processor.h>
44 
45 #define ACPI_PROCESSOR_COMPONENT	0x01000000
46 #define ACPI_PROCESSOR_CLASS		"processor"
47 #define ACPI_PROCESSOR_FILE_PERFORMANCE	"performance"
48 #define _COMPONENT		ACPI_PROCESSOR_COMPONENT
49 ACPI_MODULE_NAME("processor_perflib");
50 
51 static DEFINE_MUTEX(performance_mutex);
52 
53 /* Use cpufreq debug layer for _PPC changes. */
54 #define cpufreq_printk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, \
55 						"cpufreq-core", msg)
56 
57 /*
58  * _PPC support is implemented as a CPUfreq policy notifier:
59  * This means each time a CPUfreq driver registered also with
60  * the ACPI core is asked to change the speed policy, the maximum
61  * value is adjusted so that it is within the platform limit.
62  *
63  * Also, when a new platform limit value is detected, the CPUfreq
64  * policy is adjusted accordingly.
65  */
66 
67 static unsigned int ignore_ppc = 0;
68 module_param(ignore_ppc, uint, 0644);
69 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
70 		 "limited by BIOS, this should help");
71 
72 #define PPC_REGISTERED   1
73 #define PPC_IN_USE       2
74 
75 static int acpi_processor_ppc_status = 0;
76 
77 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
78 				       unsigned long event, void *data)
79 {
80 	struct cpufreq_policy *policy = data;
81 	struct acpi_processor *pr;
82 	unsigned int ppc = 0;
83 
84 	if (ignore_ppc)
85 		return 0;
86 
87 	mutex_lock(&performance_mutex);
88 
89 	if (event != CPUFREQ_INCOMPATIBLE)
90 		goto out;
91 
92 	pr = per_cpu(processors, policy->cpu);
93 	if (!pr || !pr->performance)
94 		goto out;
95 
96 	ppc = (unsigned int)pr->performance_platform_limit;
97 
98 	if (ppc >= pr->performance->state_count)
99 		goto out;
100 
101 	cpufreq_verify_within_limits(policy, 0,
102 				     pr->performance->states[ppc].
103 				     core_frequency * 1000);
104 
105       out:
106 	mutex_unlock(&performance_mutex);
107 
108 	return 0;
109 }
110 
111 static struct notifier_block acpi_ppc_notifier_block = {
112 	.notifier_call = acpi_processor_ppc_notifier,
113 };
114 
115 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
116 {
117 	acpi_status status = 0;
118 	unsigned long ppc = 0;
119 
120 
121 	if (!pr)
122 		return -EINVAL;
123 
124 	/*
125 	 * _PPC indicates the maximum state currently supported by the platform
126 	 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
127 	 */
128 	status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
129 
130 	if (status != AE_NOT_FOUND)
131 		acpi_processor_ppc_status |= PPC_IN_USE;
132 
133 	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
134 		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
135 		return -ENODEV;
136 	}
137 
138 	cpufreq_printk("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
139 		       (int)ppc, ppc ? "" : "not");
140 
141 	pr->performance_platform_limit = (int)ppc;
142 
143 	return 0;
144 }
145 
146 int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
147 {
148 	int ret;
149 
150 	if (ignore_ppc)
151 		return 0;
152 
153 	ret = acpi_processor_get_platform_limit(pr);
154 
155 	if (ret < 0)
156 		return (ret);
157 	else
158 		return cpufreq_update_policy(pr->id);
159 }
160 
161 void acpi_processor_ppc_init(void)
162 {
163 	if (!cpufreq_register_notifier
164 	    (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
165 		acpi_processor_ppc_status |= PPC_REGISTERED;
166 	else
167 		printk(KERN_DEBUG
168 		       "Warning: Processor Platform Limit not supported.\n");
169 }
170 
171 void acpi_processor_ppc_exit(void)
172 {
173 	if (acpi_processor_ppc_status & PPC_REGISTERED)
174 		cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
175 					    CPUFREQ_POLICY_NOTIFIER);
176 
177 	acpi_processor_ppc_status &= ~PPC_REGISTERED;
178 }
179 
180 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
181 {
182 	int result = 0;
183 	acpi_status status = 0;
184 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
185 	union acpi_object *pct = NULL;
186 	union acpi_object obj = { 0 };
187 
188 
189 	status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
190 	if (ACPI_FAILURE(status)) {
191 		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
192 		return -ENODEV;
193 	}
194 
195 	pct = (union acpi_object *)buffer.pointer;
196 	if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
197 	    || (pct->package.count != 2)) {
198 		printk(KERN_ERR PREFIX "Invalid _PCT data\n");
199 		result = -EFAULT;
200 		goto end;
201 	}
202 
203 	/*
204 	 * control_register
205 	 */
206 
207 	obj = pct->package.elements[0];
208 
209 	if ((obj.type != ACPI_TYPE_BUFFER)
210 	    || (obj.buffer.length < sizeof(struct acpi_pct_register))
211 	    || (obj.buffer.pointer == NULL)) {
212 		printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
213 		result = -EFAULT;
214 		goto end;
215 	}
216 	memcpy(&pr->performance->control_register, obj.buffer.pointer,
217 	       sizeof(struct acpi_pct_register));
218 
219 	/*
220 	 * status_register
221 	 */
222 
223 	obj = pct->package.elements[1];
224 
225 	if ((obj.type != ACPI_TYPE_BUFFER)
226 	    || (obj.buffer.length < sizeof(struct acpi_pct_register))
227 	    || (obj.buffer.pointer == NULL)) {
228 		printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
229 		result = -EFAULT;
230 		goto end;
231 	}
232 
233 	memcpy(&pr->performance->status_register, obj.buffer.pointer,
234 	       sizeof(struct acpi_pct_register));
235 
236       end:
237 	kfree(buffer.pointer);
238 
239 	return result;
240 }
241 
242 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
243 {
244 	int result = 0;
245 	acpi_status status = AE_OK;
246 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
247 	struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
248 	struct acpi_buffer state = { 0, NULL };
249 	union acpi_object *pss = NULL;
250 	int i;
251 
252 
253 	status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
254 	if (ACPI_FAILURE(status)) {
255 		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
256 		return -ENODEV;
257 	}
258 
259 	pss = buffer.pointer;
260 	if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
261 		printk(KERN_ERR PREFIX "Invalid _PSS data\n");
262 		result = -EFAULT;
263 		goto end;
264 	}
265 
266 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
267 			  pss->package.count));
268 
269 	pr->performance->state_count = pss->package.count;
270 	pr->performance->states =
271 	    kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
272 		    GFP_KERNEL);
273 	if (!pr->performance->states) {
274 		result = -ENOMEM;
275 		goto end;
276 	}
277 
278 	for (i = 0; i < pr->performance->state_count; i++) {
279 
280 		struct acpi_processor_px *px = &(pr->performance->states[i]);
281 
282 		state.length = sizeof(struct acpi_processor_px);
283 		state.pointer = px;
284 
285 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
286 
287 		status = acpi_extract_package(&(pss->package.elements[i]),
288 					      &format, &state);
289 		if (ACPI_FAILURE(status)) {
290 			ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
291 			result = -EFAULT;
292 			kfree(pr->performance->states);
293 			goto end;
294 		}
295 
296 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
297 				  "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
298 				  i,
299 				  (u32) px->core_frequency,
300 				  (u32) px->power,
301 				  (u32) px->transition_latency,
302 				  (u32) px->bus_master_latency,
303 				  (u32) px->control, (u32) px->status));
304 
305 		if (!px->core_frequency) {
306 			printk(KERN_ERR PREFIX
307 				    "Invalid _PSS data: freq is zero\n");
308 			result = -EFAULT;
309 			kfree(pr->performance->states);
310 			goto end;
311 		}
312 	}
313 
314       end:
315 	kfree(buffer.pointer);
316 
317 	return result;
318 }
319 
320 static int acpi_processor_get_performance_info(struct acpi_processor *pr)
321 {
322 	int result = 0;
323 	acpi_status status = AE_OK;
324 	acpi_handle handle = NULL;
325 
326 
327 	if (!pr || !pr->performance || !pr->handle)
328 		return -EINVAL;
329 
330 	status = acpi_get_handle(pr->handle, "_PCT", &handle);
331 	if (ACPI_FAILURE(status)) {
332 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
333 				  "ACPI-based processor performance control unavailable\n"));
334 		return -ENODEV;
335 	}
336 
337 	result = acpi_processor_get_performance_control(pr);
338 	if (result)
339 		return result;
340 
341 	result = acpi_processor_get_performance_states(pr);
342 	if (result)
343 		return result;
344 
345 	return 0;
346 }
347 
348 int acpi_processor_notify_smm(struct module *calling_module)
349 {
350 	acpi_status status;
351 	static int is_done = 0;
352 
353 
354 	if (!(acpi_processor_ppc_status & PPC_REGISTERED))
355 		return -EBUSY;
356 
357 	if (!try_module_get(calling_module))
358 		return -EINVAL;
359 
360 	/* is_done is set to negative if an error occured,
361 	 * and to postitive if _no_ error occured, but SMM
362 	 * was already notified. This avoids double notification
363 	 * which might lead to unexpected results...
364 	 */
365 	if (is_done > 0) {
366 		module_put(calling_module);
367 		return 0;
368 	} else if (is_done < 0) {
369 		module_put(calling_module);
370 		return is_done;
371 	}
372 
373 	is_done = -EIO;
374 
375 	/* Can't write pstate_control to smi_command if either value is zero */
376 	if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
377 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
378 		module_put(calling_module);
379 		return 0;
380 	}
381 
382 	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
383 			  "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
384 			  acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
385 
386 	status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
387 				    (u32) acpi_gbl_FADT.pstate_control, 8);
388 	if (ACPI_FAILURE(status)) {
389 		ACPI_EXCEPTION((AE_INFO, status,
390 				"Failed to write pstate_control [0x%x] to "
391 				"smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
392 				acpi_gbl_FADT.smi_command));
393 		module_put(calling_module);
394 		return status;
395 	}
396 
397 	/* Success. If there's no _PPC, we need to fear nothing, so
398 	 * we can allow the cpufreq driver to be rmmod'ed. */
399 	is_done = 1;
400 
401 	if (!(acpi_processor_ppc_status & PPC_IN_USE))
402 		module_put(calling_module);
403 
404 	return 0;
405 }
406 
407 EXPORT_SYMBOL(acpi_processor_notify_smm);
408 
409 #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
410 /* /proc/acpi/processor/../performance interface (DEPRECATED) */
411 
412 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file);
413 static struct file_operations acpi_processor_perf_fops = {
414 	.owner = THIS_MODULE,
415 	.open = acpi_processor_perf_open_fs,
416 	.read = seq_read,
417 	.llseek = seq_lseek,
418 	.release = single_release,
419 };
420 
421 static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset)
422 {
423 	struct acpi_processor *pr = seq->private;
424 	int i;
425 
426 
427 	if (!pr)
428 		goto end;
429 
430 	if (!pr->performance) {
431 		seq_puts(seq, "<not supported>\n");
432 		goto end;
433 	}
434 
435 	seq_printf(seq, "state count:             %d\n"
436 		   "active state:            P%d\n",
437 		   pr->performance->state_count, pr->performance->state);
438 
439 	seq_puts(seq, "states:\n");
440 	for (i = 0; i < pr->performance->state_count; i++)
441 		seq_printf(seq,
442 			   "   %cP%d:                  %d MHz, %d mW, %d uS\n",
443 			   (i == pr->performance->state ? '*' : ' '), i,
444 			   (u32) pr->performance->states[i].core_frequency,
445 			   (u32) pr->performance->states[i].power,
446 			   (u32) pr->performance->states[i].transition_latency);
447 
448       end:
449 	return 0;
450 }
451 
452 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file)
453 {
454 	return single_open(file, acpi_processor_perf_seq_show,
455 			   PDE(inode)->data);
456 }
457 
458 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
459 {
460 	struct acpi_device *device = NULL;
461 
462 
463 	if (acpi_bus_get_device(pr->handle, &device))
464 		return;
465 
466 	/* add file 'performance' [R/W] */
467 	proc_create_data(ACPI_PROCESSOR_FILE_PERFORMANCE, S_IFREG | S_IRUGO,
468 			 acpi_device_dir(device),
469 			 &acpi_processor_perf_fops, acpi_driver_data(device));
470 	return;
471 }
472 
473 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
474 {
475 	struct acpi_device *device = NULL;
476 
477 
478 	if (acpi_bus_get_device(pr->handle, &device))
479 		return;
480 
481 	/* remove file 'performance' */
482 	remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
483 			  acpi_device_dir(device));
484 
485 	return;
486 }
487 
488 #else
489 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
490 {
491 	return;
492 }
493 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
494 {
495 	return;
496 }
497 #endif				/* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
498 
499 static int acpi_processor_get_psd(struct acpi_processor	*pr)
500 {
501 	int result = 0;
502 	acpi_status status = AE_OK;
503 	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
504 	struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
505 	struct acpi_buffer state = {0, NULL};
506 	union acpi_object  *psd = NULL;
507 	struct acpi_psd_package *pdomain;
508 
509 	status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
510 	if (ACPI_FAILURE(status)) {
511 		return -ENODEV;
512 	}
513 
514 	psd = buffer.pointer;
515 	if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
516 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
517 		result = -EFAULT;
518 		goto end;
519 	}
520 
521 	if (psd->package.count != 1) {
522 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
523 		result = -EFAULT;
524 		goto end;
525 	}
526 
527 	pdomain = &(pr->performance->domain_info);
528 
529 	state.length = sizeof(struct acpi_psd_package);
530 	state.pointer = pdomain;
531 
532 	status = acpi_extract_package(&(psd->package.elements[0]),
533 		&format, &state);
534 	if (ACPI_FAILURE(status)) {
535 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
536 		result = -EFAULT;
537 		goto end;
538 	}
539 
540 	if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
541 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n"));
542 		result = -EFAULT;
543 		goto end;
544 	}
545 
546 	if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
547 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n"));
548 		result = -EFAULT;
549 		goto end;
550 	}
551 
552 end:
553 	kfree(buffer.pointer);
554 	return result;
555 }
556 
557 int acpi_processor_preregister_performance(
558 		struct acpi_processor_performance *performance)
559 {
560 	int count, count_target;
561 	int retval = 0;
562 	unsigned int i, j;
563 	cpumask_t covered_cpus;
564 	struct acpi_processor *pr;
565 	struct acpi_psd_package *pdomain;
566 	struct acpi_processor *match_pr;
567 	struct acpi_psd_package *match_pdomain;
568 
569 	mutex_lock(&performance_mutex);
570 
571 	retval = 0;
572 
573 	/* Call _PSD for all CPUs */
574 	for_each_possible_cpu(i) {
575 		pr = per_cpu(processors, i);
576 		if (!pr) {
577 			/* Look only at processors in ACPI namespace */
578 			continue;
579 		}
580 
581 		if (pr->performance) {
582 			retval = -EBUSY;
583 			continue;
584 		}
585 
586 		if (!performance || !percpu_ptr(performance, i)) {
587 			retval = -EINVAL;
588 			continue;
589 		}
590 
591 		pr->performance = percpu_ptr(performance, i);
592 		cpu_set(i, pr->performance->shared_cpu_map);
593 		if (acpi_processor_get_psd(pr)) {
594 			retval = -EINVAL;
595 			continue;
596 		}
597 	}
598 	if (retval)
599 		goto err_ret;
600 
601 	/*
602 	 * Now that we have _PSD data from all CPUs, lets setup P-state
603 	 * domain info.
604 	 */
605 	for_each_possible_cpu(i) {
606 		pr = per_cpu(processors, i);
607 		if (!pr)
608 			continue;
609 
610 		/* Basic validity check for domain info */
611 		pdomain = &(pr->performance->domain_info);
612 		if ((pdomain->revision != ACPI_PSD_REV0_REVISION) ||
613 		    (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) {
614 			retval = -EINVAL;
615 			goto err_ret;
616 		}
617 		if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
618 		    pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
619 		    pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
620 			retval = -EINVAL;
621 			goto err_ret;
622 		}
623 	}
624 
625 	cpus_clear(covered_cpus);
626 	for_each_possible_cpu(i) {
627 		pr = per_cpu(processors, i);
628 		if (!pr)
629 			continue;
630 
631 		if (cpu_isset(i, covered_cpus))
632 			continue;
633 
634 		pdomain = &(pr->performance->domain_info);
635 		cpu_set(i, pr->performance->shared_cpu_map);
636 		cpu_set(i, covered_cpus);
637 		if (pdomain->num_processors <= 1)
638 			continue;
639 
640 		/* Validate the Domain info */
641 		count_target = pdomain->num_processors;
642 		count = 1;
643 		if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
644 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
645 		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
646 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
647 		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
648 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
649 
650 		for_each_possible_cpu(j) {
651 			if (i == j)
652 				continue;
653 
654 			match_pr = per_cpu(processors, j);
655 			if (!match_pr)
656 				continue;
657 
658 			match_pdomain = &(match_pr->performance->domain_info);
659 			if (match_pdomain->domain != pdomain->domain)
660 				continue;
661 
662 			/* Here i and j are in the same domain */
663 
664 			if (match_pdomain->num_processors != count_target) {
665 				retval = -EINVAL;
666 				goto err_ret;
667 			}
668 
669 			if (pdomain->coord_type != match_pdomain->coord_type) {
670 				retval = -EINVAL;
671 				goto err_ret;
672 			}
673 
674 			cpu_set(j, covered_cpus);
675 			cpu_set(j, pr->performance->shared_cpu_map);
676 			count++;
677 		}
678 
679 		for_each_possible_cpu(j) {
680 			if (i == j)
681 				continue;
682 
683 			match_pr = per_cpu(processors, j);
684 			if (!match_pr)
685 				continue;
686 
687 			match_pdomain = &(match_pr->performance->domain_info);
688 			if (match_pdomain->domain != pdomain->domain)
689 				continue;
690 
691 			match_pr->performance->shared_type =
692 					pr->performance->shared_type;
693 			match_pr->performance->shared_cpu_map =
694 				pr->performance->shared_cpu_map;
695 		}
696 	}
697 
698 err_ret:
699 	for_each_possible_cpu(i) {
700 		pr = per_cpu(processors, i);
701 		if (!pr || !pr->performance)
702 			continue;
703 
704 		/* Assume no coordination on any error parsing domain info */
705 		if (retval) {
706 			cpus_clear(pr->performance->shared_cpu_map);
707 			cpu_set(i, pr->performance->shared_cpu_map);
708 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
709 		}
710 		pr->performance = NULL; /* Will be set for real in register */
711 	}
712 
713 	mutex_unlock(&performance_mutex);
714 	return retval;
715 }
716 EXPORT_SYMBOL(acpi_processor_preregister_performance);
717 
718 
719 int
720 acpi_processor_register_performance(struct acpi_processor_performance
721 				    *performance, unsigned int cpu)
722 {
723 	struct acpi_processor *pr;
724 
725 
726 	if (!(acpi_processor_ppc_status & PPC_REGISTERED))
727 		return -EINVAL;
728 
729 	mutex_lock(&performance_mutex);
730 
731 	pr = per_cpu(processors, cpu);
732 	if (!pr) {
733 		mutex_unlock(&performance_mutex);
734 		return -ENODEV;
735 	}
736 
737 	if (pr->performance) {
738 		mutex_unlock(&performance_mutex);
739 		return -EBUSY;
740 	}
741 
742 	WARN_ON(!performance);
743 
744 	pr->performance = performance;
745 
746 	if (acpi_processor_get_performance_info(pr)) {
747 		pr->performance = NULL;
748 		mutex_unlock(&performance_mutex);
749 		return -EIO;
750 	}
751 
752 	acpi_cpufreq_add_file(pr);
753 
754 	mutex_unlock(&performance_mutex);
755 	return 0;
756 }
757 
758 EXPORT_SYMBOL(acpi_processor_register_performance);
759 
760 void
761 acpi_processor_unregister_performance(struct acpi_processor_performance
762 				      *performance, unsigned int cpu)
763 {
764 	struct acpi_processor *pr;
765 
766 
767 	mutex_lock(&performance_mutex);
768 
769 	pr = per_cpu(processors, cpu);
770 	if (!pr) {
771 		mutex_unlock(&performance_mutex);
772 		return;
773 	}
774 
775 	if (pr->performance)
776 		kfree(pr->performance->states);
777 	pr->performance = NULL;
778 
779 	acpi_cpufreq_remove_file(pr);
780 
781 	mutex_unlock(&performance_mutex);
782 
783 	return;
784 }
785 
786 EXPORT_SYMBOL(acpi_processor_unregister_performance);
787