1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $)
4  *
5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7  *  Copyright (C) 2004       Dominik Brodowski <linux@brodo.de>
8  *  Copyright (C) 2004  Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
9  *  			- Added processor hotplug support
10  */
11 
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/cpufreq.h>
16 #include <linux/slab.h>
17 #include <linux/acpi.h>
18 #include <acpi/processor.h>
19 #ifdef CONFIG_X86
20 #include <asm/cpufeature.h>
21 #endif
22 
23 #define PREFIX "ACPI: "
24 
25 #define ACPI_PROCESSOR_FILE_PERFORMANCE	"performance"
26 
27 static DEFINE_MUTEX(performance_mutex);
28 
29 /*
30  * _PPC support is implemented as a CPUfreq policy notifier:
31  * This means each time a CPUfreq driver registered also with
32  * the ACPI core is asked to change the speed policy, the maximum
33  * value is adjusted so that it is within the platform limit.
34  *
35  * Also, when a new platform limit value is detected, the CPUfreq
36  * policy is adjusted accordingly.
37  */
38 
39 /* ignore_ppc:
40  * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
41  *       ignore _PPC
42  *  0 -> cpufreq low level drivers initialized -> consider _PPC values
43  *  1 -> ignore _PPC totally -> forced by user through boot param
44  */
45 static int ignore_ppc = -1;
46 module_param(ignore_ppc, int, 0644);
47 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
48 		 "limited by BIOS, this should help");
49 
50 static bool acpi_processor_ppc_in_use;
51 
52 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
53 {
54 	acpi_status status = 0;
55 	unsigned long long ppc = 0;
56 	int ret;
57 
58 	if (!pr)
59 		return -EINVAL;
60 
61 	/*
62 	 * _PPC indicates the maximum state currently supported by the platform
63 	 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
64 	 */
65 	status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
66 	if (status != AE_NOT_FOUND) {
67 		acpi_processor_ppc_in_use = true;
68 
69 		if (ACPI_FAILURE(status)) {
70 			acpi_evaluation_failure_warn(pr->handle, "_PPC", status);
71 			return -ENODEV;
72 		}
73 	}
74 
75 	pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
76 		       (int)ppc, ppc ? "" : "not");
77 
78 	pr->performance_platform_limit = (int)ppc;
79 
80 	if (ppc >= pr->performance->state_count ||
81 	    unlikely(!freq_qos_request_active(&pr->perflib_req)))
82 		return 0;
83 
84 	ret = freq_qos_update_request(&pr->perflib_req,
85 			pr->performance->states[ppc].core_frequency * 1000);
86 	if (ret < 0) {
87 		pr_warn("Failed to update perflib freq constraint: CPU%d (%d)\n",
88 			pr->id, ret);
89 	}
90 
91 	return 0;
92 }
93 
94 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE	0x80
95 /*
96  * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
97  * @handle: ACPI processor handle
98  * @status: the status code of _PPC evaluation
99  *	0: success. OSPM is now using the performance state specified.
100  *	1: failure. OSPM has not changed the number of P-states in use
101  */
102 static void acpi_processor_ppc_ost(acpi_handle handle, int status)
103 {
104 	if (acpi_has_method(handle, "_OST"))
105 		acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
106 				  status, NULL);
107 }
108 
109 void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
110 {
111 	int ret;
112 
113 	if (ignore_ppc || !pr->performance) {
114 		/*
115 		 * Only when it is notification event, the _OST object
116 		 * will be evaluated. Otherwise it is skipped.
117 		 */
118 		if (event_flag)
119 			acpi_processor_ppc_ost(pr->handle, 1);
120 		return;
121 	}
122 
123 	ret = acpi_processor_get_platform_limit(pr);
124 	/*
125 	 * Only when it is notification event, the _OST object
126 	 * will be evaluated. Otherwise it is skipped.
127 	 */
128 	if (event_flag) {
129 		if (ret < 0)
130 			acpi_processor_ppc_ost(pr->handle, 1);
131 		else
132 			acpi_processor_ppc_ost(pr->handle, 0);
133 	}
134 	if (ret >= 0)
135 		cpufreq_update_limits(pr->id);
136 }
137 
138 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
139 {
140 	struct acpi_processor *pr;
141 
142 	pr = per_cpu(processors, cpu);
143 	if (!pr || !pr->performance || !pr->performance->state_count)
144 		return -ENODEV;
145 	*limit = pr->performance->states[pr->performance_platform_limit].
146 		core_frequency * 1000;
147 	return 0;
148 }
149 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
150 
151 void acpi_processor_ignore_ppc_init(void)
152 {
153 	if (ignore_ppc < 0)
154 		ignore_ppc = 0;
155 }
156 
157 void acpi_processor_ppc_init(struct cpufreq_policy *policy)
158 {
159 	unsigned int cpu;
160 
161 	for_each_cpu(cpu, policy->related_cpus) {
162 		struct acpi_processor *pr = per_cpu(processors, cpu);
163 		int ret;
164 
165 		if (!pr)
166 			continue;
167 
168 		ret = freq_qos_add_request(&policy->constraints,
169 					   &pr->perflib_req,
170 					   FREQ_QOS_MAX, INT_MAX);
171 		if (ret < 0)
172 			pr_err("Failed to add freq constraint for CPU%d (%d)\n",
173 			       cpu, ret);
174 	}
175 }
176 
177 void acpi_processor_ppc_exit(struct cpufreq_policy *policy)
178 {
179 	unsigned int cpu;
180 
181 	for_each_cpu(cpu, policy->related_cpus) {
182 		struct acpi_processor *pr = per_cpu(processors, cpu);
183 
184 		if (pr)
185 			freq_qos_remove_request(&pr->perflib_req);
186 	}
187 }
188 
189 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
190 {
191 	int result = 0;
192 	acpi_status status = 0;
193 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
194 	union acpi_object *pct = NULL;
195 	union acpi_object obj = { 0 };
196 
197 
198 	status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
199 	if (ACPI_FAILURE(status)) {
200 		acpi_evaluation_failure_warn(pr->handle, "_PCT", status);
201 		return -ENODEV;
202 	}
203 
204 	pct = (union acpi_object *)buffer.pointer;
205 	if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
206 	    || (pct->package.count != 2)) {
207 		printk(KERN_ERR PREFIX "Invalid _PCT data\n");
208 		result = -EFAULT;
209 		goto end;
210 	}
211 
212 	/*
213 	 * control_register
214 	 */
215 
216 	obj = pct->package.elements[0];
217 
218 	if ((obj.type != ACPI_TYPE_BUFFER)
219 	    || (obj.buffer.length < sizeof(struct acpi_pct_register))
220 	    || (obj.buffer.pointer == NULL)) {
221 		printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
222 		result = -EFAULT;
223 		goto end;
224 	}
225 	memcpy(&pr->performance->control_register, obj.buffer.pointer,
226 	       sizeof(struct acpi_pct_register));
227 
228 	/*
229 	 * status_register
230 	 */
231 
232 	obj = pct->package.elements[1];
233 
234 	if ((obj.type != ACPI_TYPE_BUFFER)
235 	    || (obj.buffer.length < sizeof(struct acpi_pct_register))
236 	    || (obj.buffer.pointer == NULL)) {
237 		printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
238 		result = -EFAULT;
239 		goto end;
240 	}
241 
242 	memcpy(&pr->performance->status_register, obj.buffer.pointer,
243 	       sizeof(struct acpi_pct_register));
244 
245       end:
246 	kfree(buffer.pointer);
247 
248 	return result;
249 }
250 
251 #ifdef CONFIG_X86
252 /*
253  * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
254  * in their ACPI data. Calculate the real values and fix up the _PSS data.
255  */
256 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
257 {
258 	u32 hi, lo, fid, did;
259 	int index = px->control & 0x00000007;
260 
261 	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
262 		return;
263 
264 	if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
265 	    || boot_cpu_data.x86 == 0x11) {
266 		rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
267 		/*
268 		 * MSR C001_0064+:
269 		 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
270 		 */
271 		if (!(hi & BIT(31)))
272 			return;
273 
274 		fid = lo & 0x3f;
275 		did = (lo >> 6) & 7;
276 		if (boot_cpu_data.x86 == 0x10)
277 			px->core_frequency = (100 * (fid + 0x10)) >> did;
278 		else
279 			px->core_frequency = (100 * (fid + 8)) >> did;
280 	}
281 }
282 #else
283 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
284 #endif
285 
286 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
287 {
288 	int result = 0;
289 	acpi_status status = AE_OK;
290 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
291 	struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
292 	struct acpi_buffer state = { 0, NULL };
293 	union acpi_object *pss = NULL;
294 	int i;
295 	int last_invalid = -1;
296 
297 
298 	status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
299 	if (ACPI_FAILURE(status)) {
300 		acpi_evaluation_failure_warn(pr->handle, "_PSS", status);
301 		return -ENODEV;
302 	}
303 
304 	pss = buffer.pointer;
305 	if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
306 		printk(KERN_ERR PREFIX "Invalid _PSS data\n");
307 		result = -EFAULT;
308 		goto end;
309 	}
310 
311 	acpi_handle_debug(pr->handle, "Found %d performance states\n",
312 			  pss->package.count);
313 
314 	pr->performance->state_count = pss->package.count;
315 	pr->performance->states =
316 	    kmalloc_array(pss->package.count,
317 			  sizeof(struct acpi_processor_px),
318 			  GFP_KERNEL);
319 	if (!pr->performance->states) {
320 		result = -ENOMEM;
321 		goto end;
322 	}
323 
324 	for (i = 0; i < pr->performance->state_count; i++) {
325 
326 		struct acpi_processor_px *px = &(pr->performance->states[i]);
327 
328 		state.length = sizeof(struct acpi_processor_px);
329 		state.pointer = px;
330 
331 		acpi_handle_debug(pr->handle, "Extracting state %d\n", i);
332 
333 		status = acpi_extract_package(&(pss->package.elements[i]),
334 					      &format, &state);
335 		if (ACPI_FAILURE(status)) {
336 			acpi_handle_warn(pr->handle, "Invalid _PSS data: %s\n",
337 					 acpi_format_exception(status));
338 			result = -EFAULT;
339 			kfree(pr->performance->states);
340 			goto end;
341 		}
342 
343 		amd_fixup_frequency(px, i);
344 
345 		acpi_handle_debug(pr->handle,
346 				  "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
347 				  i,
348 				  (u32) px->core_frequency,
349 				  (u32) px->power,
350 				  (u32) px->transition_latency,
351 				  (u32) px->bus_master_latency,
352 				  (u32) px->control, (u32) px->status);
353 
354 		/*
355 		 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
356 		 */
357 		if (!px->core_frequency ||
358 		    ((u32)(px->core_frequency * 1000) !=
359 		     (px->core_frequency * 1000))) {
360 			printk(KERN_ERR FW_BUG PREFIX
361 			       "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
362 			       pr->id, px->core_frequency);
363 			if (last_invalid == -1)
364 				last_invalid = i;
365 		} else {
366 			if (last_invalid != -1) {
367 				/*
368 				 * Copy this valid entry over last_invalid entry
369 				 */
370 				memcpy(&(pr->performance->states[last_invalid]),
371 				       px, sizeof(struct acpi_processor_px));
372 				++last_invalid;
373 			}
374 		}
375 	}
376 
377 	if (last_invalid == 0) {
378 		printk(KERN_ERR FW_BUG PREFIX
379 		       "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
380 		result = -EFAULT;
381 		kfree(pr->performance->states);
382 		pr->performance->states = NULL;
383 	}
384 
385 	if (last_invalid > 0)
386 		pr->performance->state_count = last_invalid;
387 
388       end:
389 	kfree(buffer.pointer);
390 
391 	return result;
392 }
393 
394 int acpi_processor_get_performance_info(struct acpi_processor *pr)
395 {
396 	int result = 0;
397 
398 	if (!pr || !pr->performance || !pr->handle)
399 		return -EINVAL;
400 
401 	if (!acpi_has_method(pr->handle, "_PCT")) {
402 		acpi_handle_debug(pr->handle,
403 				  "ACPI-based processor performance control unavailable\n");
404 		return -ENODEV;
405 	}
406 
407 	result = acpi_processor_get_performance_control(pr);
408 	if (result)
409 		goto update_bios;
410 
411 	result = acpi_processor_get_performance_states(pr);
412 	if (result)
413 		goto update_bios;
414 
415 	/* We need to call _PPC once when cpufreq starts */
416 	if (ignore_ppc != 1)
417 		result = acpi_processor_get_platform_limit(pr);
418 
419 	return result;
420 
421 	/*
422 	 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
423 	 * the BIOS is older than the CPU and does not know its frequencies
424 	 */
425  update_bios:
426 #ifdef CONFIG_X86
427 	if (acpi_has_method(pr->handle, "_PPC")) {
428 		if(boot_cpu_has(X86_FEATURE_EST))
429 			printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
430 			       "frequency support\n");
431 	}
432 #endif
433 	return result;
434 }
435 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
436 
437 int acpi_processor_pstate_control(void)
438 {
439 	acpi_status status;
440 
441 	if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
442 		return 0;
443 
444 	pr_debug("Writing pstate_control [0x%x] to smi_command [0x%x]\n",
445 		 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command);
446 
447 	status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
448 				    (u32)acpi_gbl_FADT.pstate_control, 8);
449 	if (ACPI_SUCCESS(status))
450 		return 1;
451 
452 	pr_warn("Failed to write pstate_control [0x%x] to smi_command [0x%x]: %s\n",
453 		acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command,
454 		acpi_format_exception(status));
455 	return -EIO;
456 }
457 
458 int acpi_processor_notify_smm(struct module *calling_module)
459 {
460 	static int is_done;
461 	int result;
462 
463 	if (!acpi_processor_cpufreq_init)
464 		return -EBUSY;
465 
466 	if (!try_module_get(calling_module))
467 		return -EINVAL;
468 
469 	/* is_done is set to negative if an error occurred,
470 	 * and to postitive if _no_ error occurred, but SMM
471 	 * was already notified. This avoids double notification
472 	 * which might lead to unexpected results...
473 	 */
474 	if (is_done > 0) {
475 		module_put(calling_module);
476 		return 0;
477 	} else if (is_done < 0) {
478 		module_put(calling_module);
479 		return is_done;
480 	}
481 
482 	is_done = -EIO;
483 
484 	result = acpi_processor_pstate_control();
485 	if (!result) {
486 		pr_debug("No SMI port or pstate_control\n");
487 		module_put(calling_module);
488 		return 0;
489 	}
490 	if (result < 0) {
491 		module_put(calling_module);
492 		return result;
493 	}
494 
495 	/* Success. If there's no _PPC, we need to fear nothing, so
496 	 * we can allow the cpufreq driver to be rmmod'ed. */
497 	is_done = 1;
498 
499 	if (!acpi_processor_ppc_in_use)
500 		module_put(calling_module);
501 
502 	return 0;
503 }
504 
505 EXPORT_SYMBOL(acpi_processor_notify_smm);
506 
507 int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)
508 {
509 	int result = 0;
510 	acpi_status status = AE_OK;
511 	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
512 	struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
513 	struct acpi_buffer state = {0, NULL};
514 	union acpi_object  *psd = NULL;
515 
516 	status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer);
517 	if (ACPI_FAILURE(status)) {
518 		return -ENODEV;
519 	}
520 
521 	psd = buffer.pointer;
522 	if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
523 		printk(KERN_ERR PREFIX "Invalid _PSD data\n");
524 		result = -EFAULT;
525 		goto end;
526 	}
527 
528 	if (psd->package.count != 1) {
529 		printk(KERN_ERR PREFIX "Invalid _PSD data\n");
530 		result = -EFAULT;
531 		goto end;
532 	}
533 
534 	state.length = sizeof(struct acpi_psd_package);
535 	state.pointer = pdomain;
536 
537 	status = acpi_extract_package(&(psd->package.elements[0]),
538 		&format, &state);
539 	if (ACPI_FAILURE(status)) {
540 		printk(KERN_ERR PREFIX "Invalid _PSD data\n");
541 		result = -EFAULT;
542 		goto end;
543 	}
544 
545 	if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
546 		printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
547 		result = -EFAULT;
548 		goto end;
549 	}
550 
551 	if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
552 		printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
553 		result = -EFAULT;
554 		goto end;
555 	}
556 
557 	if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
558 	    pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
559 	    pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
560 		printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
561 		result = -EFAULT;
562 		goto end;
563 	}
564 end:
565 	kfree(buffer.pointer);
566 	return result;
567 }
568 EXPORT_SYMBOL(acpi_processor_get_psd);
569 
570 int acpi_processor_preregister_performance(
571 		struct acpi_processor_performance __percpu *performance)
572 {
573 	int count_target;
574 	int retval = 0;
575 	unsigned int i, j;
576 	cpumask_var_t covered_cpus;
577 	struct acpi_processor *pr;
578 	struct acpi_psd_package *pdomain;
579 	struct acpi_processor *match_pr;
580 	struct acpi_psd_package *match_pdomain;
581 
582 	if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
583 		return -ENOMEM;
584 
585 	mutex_lock(&performance_mutex);
586 
587 	/*
588 	 * Check if another driver has already registered, and abort before
589 	 * changing pr->performance if it has. Check input data as well.
590 	 */
591 	for_each_possible_cpu(i) {
592 		pr = per_cpu(processors, i);
593 		if (!pr) {
594 			/* Look only at processors in ACPI namespace */
595 			continue;
596 		}
597 
598 		if (pr->performance) {
599 			retval = -EBUSY;
600 			goto err_out;
601 		}
602 
603 		if (!performance || !per_cpu_ptr(performance, i)) {
604 			retval = -EINVAL;
605 			goto err_out;
606 		}
607 	}
608 
609 	/* Call _PSD for all CPUs */
610 	for_each_possible_cpu(i) {
611 		pr = per_cpu(processors, i);
612 		if (!pr)
613 			continue;
614 
615 		pr->performance = per_cpu_ptr(performance, i);
616 		pdomain = &(pr->performance->domain_info);
617 		if (acpi_processor_get_psd(pr->handle, pdomain)) {
618 			retval = -EINVAL;
619 			continue;
620 		}
621 	}
622 	if (retval)
623 		goto err_ret;
624 
625 	/*
626 	 * Now that we have _PSD data from all CPUs, lets setup P-state
627 	 * domain info.
628 	 */
629 	for_each_possible_cpu(i) {
630 		pr = per_cpu(processors, i);
631 		if (!pr)
632 			continue;
633 
634 		if (cpumask_test_cpu(i, covered_cpus))
635 			continue;
636 
637 		pdomain = &(pr->performance->domain_info);
638 		cpumask_set_cpu(i, pr->performance->shared_cpu_map);
639 		cpumask_set_cpu(i, covered_cpus);
640 		if (pdomain->num_processors <= 1)
641 			continue;
642 
643 		/* Validate the Domain info */
644 		count_target = pdomain->num_processors;
645 		if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
646 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
647 		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
648 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
649 		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
650 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
651 
652 		for_each_possible_cpu(j) {
653 			if (i == j)
654 				continue;
655 
656 			match_pr = per_cpu(processors, j);
657 			if (!match_pr)
658 				continue;
659 
660 			match_pdomain = &(match_pr->performance->domain_info);
661 			if (match_pdomain->domain != pdomain->domain)
662 				continue;
663 
664 			/* Here i and j are in the same domain */
665 
666 			if (match_pdomain->num_processors != count_target) {
667 				retval = -EINVAL;
668 				goto err_ret;
669 			}
670 
671 			if (pdomain->coord_type != match_pdomain->coord_type) {
672 				retval = -EINVAL;
673 				goto err_ret;
674 			}
675 
676 			cpumask_set_cpu(j, covered_cpus);
677 			cpumask_set_cpu(j, pr->performance->shared_cpu_map);
678 		}
679 
680 		for_each_possible_cpu(j) {
681 			if (i == j)
682 				continue;
683 
684 			match_pr = per_cpu(processors, j);
685 			if (!match_pr)
686 				continue;
687 
688 			match_pdomain = &(match_pr->performance->domain_info);
689 			if (match_pdomain->domain != pdomain->domain)
690 				continue;
691 
692 			match_pr->performance->shared_type =
693 					pr->performance->shared_type;
694 			cpumask_copy(match_pr->performance->shared_cpu_map,
695 				     pr->performance->shared_cpu_map);
696 		}
697 	}
698 
699 err_ret:
700 	for_each_possible_cpu(i) {
701 		pr = per_cpu(processors, i);
702 		if (!pr || !pr->performance)
703 			continue;
704 
705 		/* Assume no coordination on any error parsing domain info */
706 		if (retval) {
707 			cpumask_clear(pr->performance->shared_cpu_map);
708 			cpumask_set_cpu(i, pr->performance->shared_cpu_map);
709 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_NONE;
710 		}
711 		pr->performance = NULL; /* Will be set for real in register */
712 	}
713 
714 err_out:
715 	mutex_unlock(&performance_mutex);
716 	free_cpumask_var(covered_cpus);
717 	return retval;
718 }
719 EXPORT_SYMBOL(acpi_processor_preregister_performance);
720 
721 int
722 acpi_processor_register_performance(struct acpi_processor_performance
723 				    *performance, unsigned int cpu)
724 {
725 	struct acpi_processor *pr;
726 
727 	if (!acpi_processor_cpufreq_init)
728 		return -EINVAL;
729 
730 	mutex_lock(&performance_mutex);
731 
732 	pr = per_cpu(processors, cpu);
733 	if (!pr) {
734 		mutex_unlock(&performance_mutex);
735 		return -ENODEV;
736 	}
737 
738 	if (pr->performance) {
739 		mutex_unlock(&performance_mutex);
740 		return -EBUSY;
741 	}
742 
743 	WARN_ON(!performance);
744 
745 	pr->performance = performance;
746 
747 	if (acpi_processor_get_performance_info(pr)) {
748 		pr->performance = NULL;
749 		mutex_unlock(&performance_mutex);
750 		return -EIO;
751 	}
752 
753 	mutex_unlock(&performance_mutex);
754 	return 0;
755 }
756 
757 EXPORT_SYMBOL(acpi_processor_register_performance);
758 
759 void acpi_processor_unregister_performance(unsigned int cpu)
760 {
761 	struct acpi_processor *pr;
762 
763 	mutex_lock(&performance_mutex);
764 
765 	pr = per_cpu(processors, cpu);
766 	if (!pr) {
767 		mutex_unlock(&performance_mutex);
768 		return;
769 	}
770 
771 	if (pr->performance)
772 		kfree(pr->performance->states);
773 	pr->performance = NULL;
774 
775 	mutex_unlock(&performance_mutex);
776 
777 	return;
778 }
779 
780 EXPORT_SYMBOL(acpi_processor_unregister_performance);
781