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 #define pr_fmt(fmt) "ACPI: " fmt
13 
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/cpufreq.h>
18 #include <linux/slab.h>
19 #include <linux/acpi.h>
20 #include <acpi/processor.h>
21 #ifdef CONFIG_X86
22 #include <asm/cpufeature.h>
23 #endif
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 	s32 qos_value;
57 	int index;
58 	int ret;
59 
60 	if (!pr)
61 		return -EINVAL;
62 
63 	/*
64 	 * _PPC indicates the maximum state currently supported by the platform
65 	 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
66 	 */
67 	status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
68 	if (status != AE_NOT_FOUND) {
69 		acpi_processor_ppc_in_use = true;
70 
71 		if (ACPI_FAILURE(status)) {
72 			acpi_evaluation_failure_warn(pr->handle, "_PPC", status);
73 			return -ENODEV;
74 		}
75 	}
76 
77 	index = ppc;
78 
79 	if (pr->performance_platform_limit == index ||
80 	    ppc >= pr->performance->state_count)
81 		return 0;
82 
83 	pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
84 		 index, index ? "is" : "is not");
85 
86 	pr->performance_platform_limit = index;
87 
88 	if (unlikely(!freq_qos_request_active(&pr->perflib_req)))
89 		return 0;
90 
91 	/*
92 	 * If _PPC returns 0, it means that all of the available states can be
93 	 * used ("no limit").
94 	 */
95 	if (index == 0)
96 		qos_value = FREQ_QOS_MAX_DEFAULT_VALUE;
97 	else
98 		qos_value = pr->performance->states[index].core_frequency * 1000;
99 
100 	ret = freq_qos_update_request(&pr->perflib_req, qos_value);
101 	if (ret < 0) {
102 		pr_warn("Failed to update perflib freq constraint: CPU%d (%d)\n",
103 			pr->id, ret);
104 	}
105 
106 	return 0;
107 }
108 
109 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE	0x80
110 /*
111  * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
112  * @handle: ACPI processor handle
113  * @status: the status code of _PPC evaluation
114  *	0: success. OSPM is now using the performance state specified.
115  *	1: failure. OSPM has not changed the number of P-states in use
116  */
117 static void acpi_processor_ppc_ost(acpi_handle handle, int status)
118 {
119 	if (acpi_has_method(handle, "_OST"))
120 		acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
121 				  status, NULL);
122 }
123 
124 void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
125 {
126 	int ret;
127 
128 	if (ignore_ppc || !pr->performance) {
129 		/*
130 		 * Only when it is notification event, the _OST object
131 		 * will be evaluated. Otherwise it is skipped.
132 		 */
133 		if (event_flag)
134 			acpi_processor_ppc_ost(pr->handle, 1);
135 		return;
136 	}
137 
138 	ret = acpi_processor_get_platform_limit(pr);
139 	/*
140 	 * Only when it is notification event, the _OST object
141 	 * will be evaluated. Otherwise it is skipped.
142 	 */
143 	if (event_flag) {
144 		if (ret < 0)
145 			acpi_processor_ppc_ost(pr->handle, 1);
146 		else
147 			acpi_processor_ppc_ost(pr->handle, 0);
148 	}
149 	if (ret >= 0)
150 		cpufreq_update_limits(pr->id);
151 }
152 
153 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
154 {
155 	struct acpi_processor *pr;
156 
157 	pr = per_cpu(processors, cpu);
158 	if (!pr || !pr->performance || !pr->performance->state_count)
159 		return -ENODEV;
160 
161 	*limit = pr->performance->states[pr->performance_platform_limit].
162 		core_frequency * 1000;
163 	return 0;
164 }
165 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
166 
167 void acpi_processor_ignore_ppc_init(void)
168 {
169 	if (ignore_ppc < 0)
170 		ignore_ppc = 0;
171 }
172 
173 void acpi_processor_ppc_init(struct cpufreq_policy *policy)
174 {
175 	unsigned int cpu;
176 
177 	for_each_cpu(cpu, policy->related_cpus) {
178 		struct acpi_processor *pr = per_cpu(processors, cpu);
179 		int ret;
180 
181 		if (!pr)
182 			continue;
183 
184 		/*
185 		 * Reset performance_platform_limit in case there is a stale
186 		 * value in it, so as to make it match the "no limit" QoS value
187 		 * below.
188 		 */
189 		pr->performance_platform_limit = 0;
190 
191 		ret = freq_qos_add_request(&policy->constraints,
192 					   &pr->perflib_req, FREQ_QOS_MAX,
193 					   FREQ_QOS_MAX_DEFAULT_VALUE);
194 		if (ret < 0)
195 			pr_err("Failed to add freq constraint for CPU%d (%d)\n",
196 			       cpu, ret);
197 	}
198 }
199 
200 void acpi_processor_ppc_exit(struct cpufreq_policy *policy)
201 {
202 	unsigned int cpu;
203 
204 	for_each_cpu(cpu, policy->related_cpus) {
205 		struct acpi_processor *pr = per_cpu(processors, cpu);
206 
207 		if (pr)
208 			freq_qos_remove_request(&pr->perflib_req);
209 	}
210 }
211 
212 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
213 {
214 	int result = 0;
215 	acpi_status status = 0;
216 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
217 	union acpi_object *pct = NULL;
218 	union acpi_object obj = { 0 };
219 
220 	status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
221 	if (ACPI_FAILURE(status)) {
222 		acpi_evaluation_failure_warn(pr->handle, "_PCT", status);
223 		return -ENODEV;
224 	}
225 
226 	pct = (union acpi_object *)buffer.pointer;
227 	if (!pct || pct->type != ACPI_TYPE_PACKAGE || pct->package.count != 2) {
228 		pr_err("Invalid _PCT data\n");
229 		result = -EFAULT;
230 		goto end;
231 	}
232 
233 	/*
234 	 * control_register
235 	 */
236 
237 	obj = pct->package.elements[0];
238 
239 	if (!obj.buffer.pointer || obj.type != ACPI_TYPE_BUFFER ||
240 	    obj.buffer.length < sizeof(struct acpi_pct_register)) {
241 		pr_err("Invalid _PCT data (control_register)\n");
242 		result = -EFAULT;
243 		goto end;
244 	}
245 	memcpy(&pr->performance->control_register, obj.buffer.pointer,
246 	       sizeof(struct acpi_pct_register));
247 
248 	/*
249 	 * status_register
250 	 */
251 
252 	obj = pct->package.elements[1];
253 
254 	if (!obj.buffer.pointer || obj.type != ACPI_TYPE_BUFFER ||
255 	    obj.buffer.length < sizeof(struct acpi_pct_register)) {
256 		pr_err("Invalid _PCT data (status_register)\n");
257 		result = -EFAULT;
258 		goto end;
259 	}
260 
261 	memcpy(&pr->performance->status_register, obj.buffer.pointer,
262 	       sizeof(struct acpi_pct_register));
263 
264 end:
265 	kfree(buffer.pointer);
266 
267 	return result;
268 }
269 
270 #ifdef CONFIG_X86
271 /*
272  * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
273  * in their ACPI data. Calculate the real values and fix up the _PSS data.
274  */
275 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
276 {
277 	u32 hi, lo, fid, did;
278 	int index = px->control & 0x00000007;
279 
280 	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
281 		return;
282 
283 	if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) ||
284 	    boot_cpu_data.x86 == 0x11) {
285 		rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
286 		/*
287 		 * MSR C001_0064+:
288 		 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
289 		 */
290 		if (!(hi & BIT(31)))
291 			return;
292 
293 		fid = lo & 0x3f;
294 		did = (lo >> 6) & 7;
295 		if (boot_cpu_data.x86 == 0x10)
296 			px->core_frequency = (100 * (fid + 0x10)) >> did;
297 		else
298 			px->core_frequency = (100 * (fid + 8)) >> did;
299 	}
300 }
301 #else
302 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
303 #endif
304 
305 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
306 {
307 	int result = 0;
308 	acpi_status status = AE_OK;
309 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
310 	struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
311 	struct acpi_buffer state = { 0, NULL };
312 	union acpi_object *pss = NULL;
313 	int i;
314 	int last_invalid = -1;
315 
316 	status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
317 	if (ACPI_FAILURE(status)) {
318 		acpi_evaluation_failure_warn(pr->handle, "_PSS", status);
319 		return -ENODEV;
320 	}
321 
322 	pss = buffer.pointer;
323 	if (!pss || pss->type != ACPI_TYPE_PACKAGE) {
324 		pr_err("Invalid _PSS data\n");
325 		result = -EFAULT;
326 		goto end;
327 	}
328 
329 	acpi_handle_debug(pr->handle, "Found %d performance states\n",
330 			  pss->package.count);
331 
332 	pr->performance->state_count = pss->package.count;
333 	pr->performance->states =
334 	    kmalloc_array(pss->package.count,
335 			  sizeof(struct acpi_processor_px),
336 			  GFP_KERNEL);
337 	if (!pr->performance->states) {
338 		result = -ENOMEM;
339 		goto end;
340 	}
341 
342 	for (i = 0; i < pr->performance->state_count; i++) {
343 
344 		struct acpi_processor_px *px = &(pr->performance->states[i]);
345 
346 		state.length = sizeof(struct acpi_processor_px);
347 		state.pointer = px;
348 
349 		acpi_handle_debug(pr->handle, "Extracting state %d\n", i);
350 
351 		status = acpi_extract_package(&(pss->package.elements[i]),
352 					      &format, &state);
353 		if (ACPI_FAILURE(status)) {
354 			acpi_handle_warn(pr->handle, "Invalid _PSS data: %s\n",
355 					 acpi_format_exception(status));
356 			result = -EFAULT;
357 			kfree(pr->performance->states);
358 			goto end;
359 		}
360 
361 		amd_fixup_frequency(px, i);
362 
363 		acpi_handle_debug(pr->handle,
364 				  "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
365 				  i,
366 				  (u32) px->core_frequency,
367 				  (u32) px->power,
368 				  (u32) px->transition_latency,
369 				  (u32) px->bus_master_latency,
370 				  (u32) px->control, (u32) px->status);
371 
372 		/*
373 		 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
374 		 */
375 		if (!px->core_frequency ||
376 		    (u32)(px->core_frequency * 1000) != px->core_frequency * 1000) {
377 			pr_err(FW_BUG
378 			       "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
379 			       pr->id, px->core_frequency);
380 			if (last_invalid == -1)
381 				last_invalid = i;
382 		} else {
383 			if (last_invalid != -1) {
384 				/*
385 				 * Copy this valid entry over last_invalid entry
386 				 */
387 				memcpy(&(pr->performance->states[last_invalid]),
388 				       px, sizeof(struct acpi_processor_px));
389 				++last_invalid;
390 			}
391 		}
392 	}
393 
394 	if (last_invalid == 0) {
395 		pr_err(FW_BUG
396 			   "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
397 		result = -EFAULT;
398 		kfree(pr->performance->states);
399 		pr->performance->states = NULL;
400 	}
401 
402 	if (last_invalid > 0)
403 		pr->performance->state_count = last_invalid;
404 
405 end:
406 	kfree(buffer.pointer);
407 
408 	return result;
409 }
410 
411 int acpi_processor_get_performance_info(struct acpi_processor *pr)
412 {
413 	int result = 0;
414 
415 	if (!pr || !pr->performance || !pr->handle)
416 		return -EINVAL;
417 
418 	if (!acpi_has_method(pr->handle, "_PCT")) {
419 		acpi_handle_debug(pr->handle,
420 				  "ACPI-based processor performance control unavailable\n");
421 		return -ENODEV;
422 	}
423 
424 	result = acpi_processor_get_performance_control(pr);
425 	if (result)
426 		goto update_bios;
427 
428 	result = acpi_processor_get_performance_states(pr);
429 	if (result)
430 		goto update_bios;
431 
432 	/* We need to call _PPC once when cpufreq starts */
433 	if (ignore_ppc != 1)
434 		result = acpi_processor_get_platform_limit(pr);
435 
436 	return result;
437 
438 	/*
439 	 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
440 	 * the BIOS is older than the CPU and does not know its frequencies
441 	 */
442  update_bios:
443 #ifdef CONFIG_X86
444 	if (acpi_has_method(pr->handle, "_PPC")) {
445 		if(boot_cpu_has(X86_FEATURE_EST))
446 			pr_warn(FW_BUG "BIOS needs update for CPU "
447 			       "frequency support\n");
448 	}
449 #endif
450 	return result;
451 }
452 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
453 
454 int acpi_processor_pstate_control(void)
455 {
456 	acpi_status status;
457 
458 	if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
459 		return 0;
460 
461 	pr_debug("Writing pstate_control [0x%x] to smi_command [0x%x]\n",
462 		 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command);
463 
464 	status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
465 				    (u32)acpi_gbl_FADT.pstate_control, 8);
466 	if (ACPI_SUCCESS(status))
467 		return 1;
468 
469 	pr_warn("Failed to write pstate_control [0x%x] to smi_command [0x%x]: %s\n",
470 		acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command,
471 		acpi_format_exception(status));
472 	return -EIO;
473 }
474 
475 int acpi_processor_notify_smm(struct module *calling_module)
476 {
477 	static int is_done;
478 	int result = 0;
479 
480 	if (!acpi_processor_cpufreq_init)
481 		return -EBUSY;
482 
483 	if (!try_module_get(calling_module))
484 		return -EINVAL;
485 
486 	/*
487 	 * is_done is set to negative if an error occurs and to 1 if no error
488 	 * occurrs, but SMM has been notified already. This avoids repeated
489 	 * notification which might lead to unexpected results.
490 	 */
491 	if (is_done != 0) {
492 		if (is_done < 0)
493 			result = is_done;
494 
495 		goto out_put;
496 	}
497 
498 	result = acpi_processor_pstate_control();
499 	if (result <= 0) {
500 		if (result) {
501 			is_done = result;
502 		} else {
503 			pr_debug("No SMI port or pstate_control\n");
504 			is_done = 1;
505 		}
506 		goto out_put;
507 	}
508 
509 	is_done = 1;
510 	/*
511 	 * Success. If there _PPC, unloading the cpufreq driver would be risky,
512 	 * so disallow it in that case.
513 	 */
514 	if (acpi_processor_ppc_in_use)
515 		return 0;
516 
517 out_put:
518 	module_put(calling_module);
519 	return result;
520 }
521 EXPORT_SYMBOL(acpi_processor_notify_smm);
522 
523 int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)
524 {
525 	int result = 0;
526 	acpi_status status = AE_OK;
527 	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
528 	struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
529 	struct acpi_buffer state = {0, NULL};
530 	union acpi_object  *psd = NULL;
531 
532 	status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer);
533 	if (ACPI_FAILURE(status)) {
534 		return -ENODEV;
535 	}
536 
537 	psd = buffer.pointer;
538 	if (!psd || psd->type != ACPI_TYPE_PACKAGE) {
539 		pr_err("Invalid _PSD data\n");
540 		result = -EFAULT;
541 		goto end;
542 	}
543 
544 	if (psd->package.count != 1) {
545 		pr_err("Invalid _PSD data\n");
546 		result = -EFAULT;
547 		goto end;
548 	}
549 
550 	state.length = sizeof(struct acpi_psd_package);
551 	state.pointer = pdomain;
552 
553 	status = acpi_extract_package(&(psd->package.elements[0]), &format, &state);
554 	if (ACPI_FAILURE(status)) {
555 		pr_err("Invalid _PSD data\n");
556 		result = -EFAULT;
557 		goto end;
558 	}
559 
560 	if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
561 		pr_err("Unknown _PSD:num_entries\n");
562 		result = -EFAULT;
563 		goto end;
564 	}
565 
566 	if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
567 		pr_err("Unknown _PSD:revision\n");
568 		result = -EFAULT;
569 		goto end;
570 	}
571 
572 	if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
573 	    pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
574 	    pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
575 		pr_err("Invalid _PSD:coord_type\n");
576 		result = -EFAULT;
577 		goto end;
578 	}
579 end:
580 	kfree(buffer.pointer);
581 	return result;
582 }
583 EXPORT_SYMBOL(acpi_processor_get_psd);
584 
585 int acpi_processor_preregister_performance(
586 		struct acpi_processor_performance __percpu *performance)
587 {
588 	int count_target;
589 	int retval = 0;
590 	unsigned int i, j;
591 	cpumask_var_t covered_cpus;
592 	struct acpi_processor *pr;
593 	struct acpi_psd_package *pdomain;
594 	struct acpi_processor *match_pr;
595 	struct acpi_psd_package *match_pdomain;
596 
597 	if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
598 		return -ENOMEM;
599 
600 	mutex_lock(&performance_mutex);
601 
602 	/*
603 	 * Check if another driver has already registered, and abort before
604 	 * changing pr->performance if it has. Check input data as well.
605 	 */
606 	for_each_possible_cpu(i) {
607 		pr = per_cpu(processors, i);
608 		if (!pr) {
609 			/* Look only at processors in ACPI namespace */
610 			continue;
611 		}
612 
613 		if (pr->performance) {
614 			retval = -EBUSY;
615 			goto err_out;
616 		}
617 
618 		if (!performance || !per_cpu_ptr(performance, i)) {
619 			retval = -EINVAL;
620 			goto err_out;
621 		}
622 	}
623 
624 	/* Call _PSD for all CPUs */
625 	for_each_possible_cpu(i) {
626 		pr = per_cpu(processors, i);
627 		if (!pr)
628 			continue;
629 
630 		pr->performance = per_cpu_ptr(performance, i);
631 		pdomain = &(pr->performance->domain_info);
632 		if (acpi_processor_get_psd(pr->handle, pdomain)) {
633 			retval = -EINVAL;
634 			continue;
635 		}
636 	}
637 	if (retval)
638 		goto err_ret;
639 
640 	/*
641 	 * Now that we have _PSD data from all CPUs, lets setup P-state
642 	 * domain info.
643 	 */
644 	for_each_possible_cpu(i) {
645 		pr = per_cpu(processors, i);
646 		if (!pr)
647 			continue;
648 
649 		if (cpumask_test_cpu(i, covered_cpus))
650 			continue;
651 
652 		pdomain = &(pr->performance->domain_info);
653 		cpumask_set_cpu(i, pr->performance->shared_cpu_map);
654 		cpumask_set_cpu(i, covered_cpus);
655 		if (pdomain->num_processors <= 1)
656 			continue;
657 
658 		/* Validate the Domain info */
659 		count_target = pdomain->num_processors;
660 		if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
661 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
662 		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
663 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
664 		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
665 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
666 
667 		for_each_possible_cpu(j) {
668 			if (i == j)
669 				continue;
670 
671 			match_pr = per_cpu(processors, j);
672 			if (!match_pr)
673 				continue;
674 
675 			match_pdomain = &(match_pr->performance->domain_info);
676 			if (match_pdomain->domain != pdomain->domain)
677 				continue;
678 
679 			/* Here i and j are in the same domain */
680 
681 			if (match_pdomain->num_processors != count_target) {
682 				retval = -EINVAL;
683 				goto err_ret;
684 			}
685 
686 			if (pdomain->coord_type != match_pdomain->coord_type) {
687 				retval = -EINVAL;
688 				goto err_ret;
689 			}
690 
691 			cpumask_set_cpu(j, covered_cpus);
692 			cpumask_set_cpu(j, pr->performance->shared_cpu_map);
693 		}
694 
695 		for_each_possible_cpu(j) {
696 			if (i == j)
697 				continue;
698 
699 			match_pr = per_cpu(processors, j);
700 			if (!match_pr)
701 				continue;
702 
703 			match_pdomain = &(match_pr->performance->domain_info);
704 			if (match_pdomain->domain != pdomain->domain)
705 				continue;
706 
707 			match_pr->performance->shared_type =
708 					pr->performance->shared_type;
709 			cpumask_copy(match_pr->performance->shared_cpu_map,
710 				     pr->performance->shared_cpu_map);
711 		}
712 	}
713 
714 err_ret:
715 	for_each_possible_cpu(i) {
716 		pr = per_cpu(processors, i);
717 		if (!pr || !pr->performance)
718 			continue;
719 
720 		/* Assume no coordination on any error parsing domain info */
721 		if (retval) {
722 			cpumask_clear(pr->performance->shared_cpu_map);
723 			cpumask_set_cpu(i, pr->performance->shared_cpu_map);
724 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_NONE;
725 		}
726 		pr->performance = NULL; /* Will be set for real in register */
727 	}
728 
729 err_out:
730 	mutex_unlock(&performance_mutex);
731 	free_cpumask_var(covered_cpus);
732 	return retval;
733 }
734 EXPORT_SYMBOL(acpi_processor_preregister_performance);
735 
736 int acpi_processor_register_performance(struct acpi_processor_performance
737 					*performance, unsigned int cpu)
738 {
739 	struct acpi_processor *pr;
740 
741 	if (!acpi_processor_cpufreq_init)
742 		return -EINVAL;
743 
744 	mutex_lock(&performance_mutex);
745 
746 	pr = per_cpu(processors, cpu);
747 	if (!pr) {
748 		mutex_unlock(&performance_mutex);
749 		return -ENODEV;
750 	}
751 
752 	if (pr->performance) {
753 		mutex_unlock(&performance_mutex);
754 		return -EBUSY;
755 	}
756 
757 	WARN_ON(!performance);
758 
759 	pr->performance = performance;
760 
761 	if (acpi_processor_get_performance_info(pr)) {
762 		pr->performance = NULL;
763 		mutex_unlock(&performance_mutex);
764 		return -EIO;
765 	}
766 
767 	mutex_unlock(&performance_mutex);
768 	return 0;
769 }
770 EXPORT_SYMBOL(acpi_processor_register_performance);
771 
772 void acpi_processor_unregister_performance(unsigned int cpu)
773 {
774 	struct acpi_processor *pr;
775 
776 	mutex_lock(&performance_mutex);
777 
778 	pr = per_cpu(processors, cpu);
779 	if (!pr)
780 		goto unlock;
781 
782 	if (pr->performance)
783 		kfree(pr->performance->states);
784 
785 	pr->performance = NULL;
786 
787 unlock:
788 	mutex_unlock(&performance_mutex);
789 }
790 EXPORT_SYMBOL(acpi_processor_unregister_performance);
791