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 #include <asm/msr.h>
24 #endif
25 
26 #define ACPI_PROCESSOR_FILE_PERFORMANCE	"performance"
27 
28 /*
29  * _PPC support is implemented as a CPUfreq policy notifier:
30  * This means each time a CPUfreq driver registered also with
31  * the ACPI core is asked to change the speed policy, the maximum
32  * value is adjusted so that it is within the platform limit.
33  *
34  * Also, when a new platform limit value is detected, the CPUfreq
35  * policy is adjusted accordingly.
36  */
37 
38 /* ignore_ppc:
39  * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
40  *       ignore _PPC
41  *  0 -> cpufreq low level drivers initialized -> consider _PPC values
42  *  1 -> ignore _PPC totally -> forced by user through boot param
43  */
44 static int ignore_ppc = -1;
45 module_param(ignore_ppc, int, 0644);
46 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
47 		 "limited by BIOS, this should help");
48 
49 static bool acpi_processor_ppc_in_use;
50 
51 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
52 {
53 	acpi_status status = 0;
54 	unsigned long long ppc = 0;
55 	s32 qos_value;
56 	int index;
57 	int ret;
58 
59 	if (!pr)
60 		return -EINVAL;
61 
62 	/*
63 	 * _PPC indicates the maximum state currently supported by the platform
64 	 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
65 	 */
66 	status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
67 	if (status != AE_NOT_FOUND) {
68 		acpi_processor_ppc_in_use = true;
69 
70 		if (ACPI_FAILURE(status)) {
71 			acpi_evaluation_failure_warn(pr->handle, "_PPC", status);
72 			return -ENODEV;
73 		}
74 	}
75 
76 	index = ppc;
77 
78 	if (pr->performance_platform_limit == index ||
79 	    ppc >= pr->performance->state_count)
80 		return 0;
81 
82 	pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
83 		 index, index ? "is" : "is not");
84 
85 	pr->performance_platform_limit = index;
86 
87 	if (unlikely(!freq_qos_request_active(&pr->perflib_req)))
88 		return 0;
89 
90 	/*
91 	 * If _PPC returns 0, it means that all of the available states can be
92 	 * used ("no limit").
93 	 */
94 	if (index == 0)
95 		qos_value = FREQ_QOS_MAX_DEFAULT_VALUE;
96 	else
97 		qos_value = pr->performance->states[index].core_frequency * 1000;
98 
99 	ret = freq_qos_update_request(&pr->perflib_req, qos_value);
100 	if (ret < 0) {
101 		pr_warn("Failed to update perflib freq constraint: CPU%d (%d)\n",
102 			pr->id, ret);
103 	}
104 
105 	return 0;
106 }
107 
108 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE	0x80
109 /*
110  * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
111  * @handle: ACPI processor handle
112  * @status: the status code of _PPC evaluation
113  *	0: success. OSPM is now using the performance state specified.
114  *	1: failure. OSPM has not changed the number of P-states in use
115  */
116 static void acpi_processor_ppc_ost(acpi_handle handle, int status)
117 {
118 	if (acpi_has_method(handle, "_OST"))
119 		acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
120 				  status, NULL);
121 }
122 
123 void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
124 {
125 	int ret;
126 
127 	if (ignore_ppc || !pr->performance) {
128 		/*
129 		 * Only when it is notification event, the _OST object
130 		 * will be evaluated. Otherwise it is skipped.
131 		 */
132 		if (event_flag)
133 			acpi_processor_ppc_ost(pr->handle, 1);
134 		return;
135 	}
136 
137 	ret = acpi_processor_get_platform_limit(pr);
138 	/*
139 	 * Only when it is notification event, the _OST object
140 	 * will be evaluated. Otherwise it is skipped.
141 	 */
142 	if (event_flag) {
143 		if (ret < 0)
144 			acpi_processor_ppc_ost(pr->handle, 1);
145 		else
146 			acpi_processor_ppc_ost(pr->handle, 0);
147 	}
148 	if (ret >= 0)
149 		cpufreq_update_limits(pr->id);
150 }
151 
152 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
153 {
154 	struct acpi_processor *pr;
155 
156 	pr = per_cpu(processors, cpu);
157 	if (!pr || !pr->performance || !pr->performance->state_count)
158 		return -ENODEV;
159 
160 	*limit = pr->performance->states[pr->performance_platform_limit].
161 		core_frequency * 1000;
162 	return 0;
163 }
164 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
165 
166 void acpi_processor_ignore_ppc_init(void)
167 {
168 	if (ignore_ppc < 0)
169 		ignore_ppc = 0;
170 }
171 
172 void acpi_processor_ppc_init(struct cpufreq_policy *policy)
173 {
174 	unsigned int cpu;
175 
176 	for_each_cpu(cpu, policy->related_cpus) {
177 		struct acpi_processor *pr = per_cpu(processors, cpu);
178 		int ret;
179 
180 		if (!pr)
181 			continue;
182 
183 		/*
184 		 * Reset performance_platform_limit in case there is a stale
185 		 * value in it, so as to make it match the "no limit" QoS value
186 		 * below.
187 		 */
188 		pr->performance_platform_limit = 0;
189 
190 		ret = freq_qos_add_request(&policy->constraints,
191 					   &pr->perflib_req, FREQ_QOS_MAX,
192 					   FREQ_QOS_MAX_DEFAULT_VALUE);
193 		if (ret < 0)
194 			pr_err("Failed to add freq constraint for CPU%d (%d)\n",
195 			       cpu, ret);
196 	}
197 }
198 
199 void acpi_processor_ppc_exit(struct cpufreq_policy *policy)
200 {
201 	unsigned int cpu;
202 
203 	for_each_cpu(cpu, policy->related_cpus) {
204 		struct acpi_processor *pr = per_cpu(processors, cpu);
205 
206 		if (pr)
207 			freq_qos_remove_request(&pr->perflib_req);
208 	}
209 }
210 
211 #ifdef CONFIG_X86
212 
213 static DEFINE_MUTEX(performance_mutex);
214 
215 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
216 {
217 	int result = 0;
218 	acpi_status status = 0;
219 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
220 	union acpi_object *pct = NULL;
221 	union acpi_object obj = { 0 };
222 
223 	status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
224 	if (ACPI_FAILURE(status)) {
225 		acpi_evaluation_failure_warn(pr->handle, "_PCT", status);
226 		return -ENODEV;
227 	}
228 
229 	pct = (union acpi_object *)buffer.pointer;
230 	if (!pct || pct->type != ACPI_TYPE_PACKAGE || pct->package.count != 2) {
231 		pr_err("Invalid _PCT data\n");
232 		result = -EFAULT;
233 		goto end;
234 	}
235 
236 	/*
237 	 * control_register
238 	 */
239 
240 	obj = pct->package.elements[0];
241 
242 	if (!obj.buffer.pointer || obj.type != ACPI_TYPE_BUFFER ||
243 	    obj.buffer.length < sizeof(struct acpi_pct_register)) {
244 		pr_err("Invalid _PCT data (control_register)\n");
245 		result = -EFAULT;
246 		goto end;
247 	}
248 	memcpy(&pr->performance->control_register, obj.buffer.pointer,
249 	       sizeof(struct acpi_pct_register));
250 
251 	/*
252 	 * status_register
253 	 */
254 
255 	obj = pct->package.elements[1];
256 
257 	if (!obj.buffer.pointer || obj.type != ACPI_TYPE_BUFFER ||
258 	    obj.buffer.length < sizeof(struct acpi_pct_register)) {
259 		pr_err("Invalid _PCT data (status_register)\n");
260 		result = -EFAULT;
261 		goto end;
262 	}
263 
264 	memcpy(&pr->performance->status_register, obj.buffer.pointer,
265 	       sizeof(struct acpi_pct_register));
266 
267 end:
268 	kfree(buffer.pointer);
269 
270 	return result;
271 }
272 
273 /*
274  * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
275  * in their ACPI data. Calculate the real values and fix up the _PSS data.
276  */
277 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
278 {
279 	u32 hi, lo, fid, did;
280 	int index = px->control & 0x00000007;
281 
282 	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
283 		return;
284 
285 	if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) ||
286 	    boot_cpu_data.x86 == 0x11) {
287 		rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
288 		/*
289 		 * MSR C001_0064+:
290 		 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
291 		 */
292 		if (!(hi & BIT(31)))
293 			return;
294 
295 		fid = lo & 0x3f;
296 		did = (lo >> 6) & 7;
297 		if (boot_cpu_data.x86 == 0x10)
298 			px->core_frequency = (100 * (fid + 0x10)) >> did;
299 		else
300 			px->core_frequency = (100 * (fid + 8)) >> did;
301 	}
302 }
303 
304 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
305 {
306 	int result = 0;
307 	acpi_status status = AE_OK;
308 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
309 	struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
310 	struct acpi_buffer state = { 0, NULL };
311 	union acpi_object *pss = NULL;
312 	int i;
313 	int last_invalid = -1;
314 
315 	status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
316 	if (ACPI_FAILURE(status)) {
317 		acpi_evaluation_failure_warn(pr->handle, "_PSS", status);
318 		return -ENODEV;
319 	}
320 
321 	pss = buffer.pointer;
322 	if (!pss || pss->type != ACPI_TYPE_PACKAGE) {
323 		pr_err("Invalid _PSS data\n");
324 		result = -EFAULT;
325 		goto end;
326 	}
327 
328 	acpi_handle_debug(pr->handle, "Found %d performance states\n",
329 			  pss->package.count);
330 
331 	pr->performance->state_count = pss->package.count;
332 	pr->performance->states =
333 	    kmalloc_array(pss->package.count,
334 			  sizeof(struct acpi_processor_px),
335 			  GFP_KERNEL);
336 	if (!pr->performance->states) {
337 		result = -ENOMEM;
338 		goto end;
339 	}
340 
341 	for (i = 0; i < pr->performance->state_count; i++) {
342 
343 		struct acpi_processor_px *px = &(pr->performance->states[i]);
344 
345 		state.length = sizeof(struct acpi_processor_px);
346 		state.pointer = px;
347 
348 		acpi_handle_debug(pr->handle, "Extracting state %d\n", i);
349 
350 		status = acpi_extract_package(&(pss->package.elements[i]),
351 					      &format, &state);
352 		if (ACPI_FAILURE(status)) {
353 			acpi_handle_warn(pr->handle, "Invalid _PSS data: %s\n",
354 					 acpi_format_exception(status));
355 			result = -EFAULT;
356 			kfree(pr->performance->states);
357 			goto end;
358 		}
359 
360 		amd_fixup_frequency(px, i);
361 
362 		acpi_handle_debug(pr->handle,
363 				  "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
364 				  i,
365 				  (u32) px->core_frequency,
366 				  (u32) px->power,
367 				  (u32) px->transition_latency,
368 				  (u32) px->bus_master_latency,
369 				  (u32) px->control, (u32) px->status);
370 
371 		/*
372 		 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
373 		 */
374 		if (!px->core_frequency ||
375 		    (u32)(px->core_frequency * 1000) != px->core_frequency * 1000) {
376 			pr_err(FW_BUG
377 			       "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
378 			       pr->id, px->core_frequency);
379 			if (last_invalid == -1)
380 				last_invalid = i;
381 		} else {
382 			if (last_invalid != -1) {
383 				/*
384 				 * Copy this valid entry over last_invalid entry
385 				 */
386 				memcpy(&(pr->performance->states[last_invalid]),
387 				       px, sizeof(struct acpi_processor_px));
388 				++last_invalid;
389 			}
390 		}
391 	}
392 
393 	if (last_invalid == 0) {
394 		pr_err(FW_BUG
395 			   "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
396 		result = -EFAULT;
397 		kfree(pr->performance->states);
398 		pr->performance->states = NULL;
399 	}
400 
401 	if (last_invalid > 0)
402 		pr->performance->state_count = last_invalid;
403 
404 end:
405 	kfree(buffer.pointer);
406 
407 	return result;
408 }
409 
410 int acpi_processor_get_performance_info(struct acpi_processor *pr)
411 {
412 	int result = 0;
413 
414 	if (!pr || !pr->performance || !pr->handle)
415 		return -EINVAL;
416 
417 	if (!acpi_has_method(pr->handle, "_PCT")) {
418 		acpi_handle_debug(pr->handle,
419 				  "ACPI-based processor performance control unavailable\n");
420 		return -ENODEV;
421 	}
422 
423 	result = acpi_processor_get_performance_control(pr);
424 	if (result)
425 		goto update_bios;
426 
427 	result = acpi_processor_get_performance_states(pr);
428 	if (result)
429 		goto update_bios;
430 
431 	/* We need to call _PPC once when cpufreq starts */
432 	if (ignore_ppc != 1)
433 		result = acpi_processor_get_platform_limit(pr);
434 
435 	return result;
436 
437 	/*
438 	 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
439 	 * the BIOS is older than the CPU and does not know its frequencies
440 	 */
441  update_bios:
442 	if (acpi_has_method(pr->handle, "_PPC")) {
443 		if(boot_cpu_has(X86_FEATURE_EST))
444 			pr_warn(FW_BUG "BIOS needs update for CPU "
445 			       "frequency support\n");
446 	}
447 	return result;
448 }
449 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
450 
451 int acpi_processor_pstate_control(void)
452 {
453 	acpi_status status;
454 
455 	if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
456 		return 0;
457 
458 	pr_debug("Writing pstate_control [0x%x] to smi_command [0x%x]\n",
459 		 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command);
460 
461 	status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
462 				    (u32)acpi_gbl_FADT.pstate_control, 8);
463 	if (ACPI_SUCCESS(status))
464 		return 1;
465 
466 	pr_warn("Failed to write pstate_control [0x%x] to smi_command [0x%x]: %s\n",
467 		acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command,
468 		acpi_format_exception(status));
469 	return -EIO;
470 }
471 
472 int acpi_processor_notify_smm(struct module *calling_module)
473 {
474 	static int is_done;
475 	int result = 0;
476 
477 	if (!acpi_processor_cpufreq_init)
478 		return -EBUSY;
479 
480 	if (!try_module_get(calling_module))
481 		return -EINVAL;
482 
483 	/*
484 	 * is_done is set to negative if an error occurs and to 1 if no error
485 	 * occurrs, but SMM has been notified already. This avoids repeated
486 	 * notification which might lead to unexpected results.
487 	 */
488 	if (is_done != 0) {
489 		if (is_done < 0)
490 			result = is_done;
491 
492 		goto out_put;
493 	}
494 
495 	result = acpi_processor_pstate_control();
496 	if (result <= 0) {
497 		if (result) {
498 			is_done = result;
499 		} else {
500 			pr_debug("No SMI port or pstate_control\n");
501 			is_done = 1;
502 		}
503 		goto out_put;
504 	}
505 
506 	is_done = 1;
507 	/*
508 	 * Success. If there _PPC, unloading the cpufreq driver would be risky,
509 	 * so disallow it in that case.
510 	 */
511 	if (acpi_processor_ppc_in_use)
512 		return 0;
513 
514 out_put:
515 	module_put(calling_module);
516 	return result;
517 }
518 EXPORT_SYMBOL(acpi_processor_notify_smm);
519 
520 int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)
521 {
522 	int result = 0;
523 	acpi_status status = AE_OK;
524 	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
525 	struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
526 	struct acpi_buffer state = {0, NULL};
527 	union acpi_object  *psd = NULL;
528 
529 	status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer);
530 	if (ACPI_FAILURE(status)) {
531 		return -ENODEV;
532 	}
533 
534 	psd = buffer.pointer;
535 	if (!psd || psd->type != ACPI_TYPE_PACKAGE) {
536 		pr_err("Invalid _PSD data\n");
537 		result = -EFAULT;
538 		goto end;
539 	}
540 
541 	if (psd->package.count != 1) {
542 		pr_err("Invalid _PSD data\n");
543 		result = -EFAULT;
544 		goto end;
545 	}
546 
547 	state.length = sizeof(struct acpi_psd_package);
548 	state.pointer = pdomain;
549 
550 	status = acpi_extract_package(&(psd->package.elements[0]), &format, &state);
551 	if (ACPI_FAILURE(status)) {
552 		pr_err("Invalid _PSD data\n");
553 		result = -EFAULT;
554 		goto end;
555 	}
556 
557 	if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
558 		pr_err("Unknown _PSD:num_entries\n");
559 		result = -EFAULT;
560 		goto end;
561 	}
562 
563 	if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
564 		pr_err("Unknown _PSD:revision\n");
565 		result = -EFAULT;
566 		goto end;
567 	}
568 
569 	if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
570 	    pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
571 	    pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
572 		pr_err("Invalid _PSD:coord_type\n");
573 		result = -EFAULT;
574 		goto end;
575 	}
576 end:
577 	kfree(buffer.pointer);
578 	return result;
579 }
580 EXPORT_SYMBOL(acpi_processor_get_psd);
581 
582 int acpi_processor_preregister_performance(
583 		struct acpi_processor_performance __percpu *performance)
584 {
585 	int count_target;
586 	int retval = 0;
587 	unsigned int i, j;
588 	cpumask_var_t covered_cpus;
589 	struct acpi_processor *pr;
590 	struct acpi_psd_package *pdomain;
591 	struct acpi_processor *match_pr;
592 	struct acpi_psd_package *match_pdomain;
593 
594 	if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
595 		return -ENOMEM;
596 
597 	mutex_lock(&performance_mutex);
598 
599 	/*
600 	 * Check if another driver has already registered, and abort before
601 	 * changing pr->performance if it has. Check input data as well.
602 	 */
603 	for_each_possible_cpu(i) {
604 		pr = per_cpu(processors, i);
605 		if (!pr) {
606 			/* Look only at processors in ACPI namespace */
607 			continue;
608 		}
609 
610 		if (pr->performance) {
611 			retval = -EBUSY;
612 			goto err_out;
613 		}
614 
615 		if (!performance || !per_cpu_ptr(performance, i)) {
616 			retval = -EINVAL;
617 			goto err_out;
618 		}
619 	}
620 
621 	/* Call _PSD for all CPUs */
622 	for_each_possible_cpu(i) {
623 		pr = per_cpu(processors, i);
624 		if (!pr)
625 			continue;
626 
627 		pr->performance = per_cpu_ptr(performance, i);
628 		pdomain = &(pr->performance->domain_info);
629 		if (acpi_processor_get_psd(pr->handle, pdomain)) {
630 			retval = -EINVAL;
631 			continue;
632 		}
633 	}
634 	if (retval)
635 		goto err_ret;
636 
637 	/*
638 	 * Now that we have _PSD data from all CPUs, lets setup P-state
639 	 * domain info.
640 	 */
641 	for_each_possible_cpu(i) {
642 		pr = per_cpu(processors, i);
643 		if (!pr)
644 			continue;
645 
646 		if (cpumask_test_cpu(i, covered_cpus))
647 			continue;
648 
649 		pdomain = &(pr->performance->domain_info);
650 		cpumask_set_cpu(i, pr->performance->shared_cpu_map);
651 		cpumask_set_cpu(i, covered_cpus);
652 		if (pdomain->num_processors <= 1)
653 			continue;
654 
655 		/* Validate the Domain info */
656 		count_target = pdomain->num_processors;
657 		if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
658 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
659 		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
660 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
661 		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
662 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
663 
664 		for_each_possible_cpu(j) {
665 			if (i == j)
666 				continue;
667 
668 			match_pr = per_cpu(processors, j);
669 			if (!match_pr)
670 				continue;
671 
672 			match_pdomain = &(match_pr->performance->domain_info);
673 			if (match_pdomain->domain != pdomain->domain)
674 				continue;
675 
676 			/* Here i and j are in the same domain */
677 
678 			if (match_pdomain->num_processors != count_target) {
679 				retval = -EINVAL;
680 				goto err_ret;
681 			}
682 
683 			if (pdomain->coord_type != match_pdomain->coord_type) {
684 				retval = -EINVAL;
685 				goto err_ret;
686 			}
687 
688 			cpumask_set_cpu(j, covered_cpus);
689 			cpumask_set_cpu(j, pr->performance->shared_cpu_map);
690 		}
691 
692 		for_each_possible_cpu(j) {
693 			if (i == j)
694 				continue;
695 
696 			match_pr = per_cpu(processors, j);
697 			if (!match_pr)
698 				continue;
699 
700 			match_pdomain = &(match_pr->performance->domain_info);
701 			if (match_pdomain->domain != pdomain->domain)
702 				continue;
703 
704 			match_pr->performance->shared_type =
705 					pr->performance->shared_type;
706 			cpumask_copy(match_pr->performance->shared_cpu_map,
707 				     pr->performance->shared_cpu_map);
708 		}
709 	}
710 
711 err_ret:
712 	for_each_possible_cpu(i) {
713 		pr = per_cpu(processors, i);
714 		if (!pr || !pr->performance)
715 			continue;
716 
717 		/* Assume no coordination on any error parsing domain info */
718 		if (retval) {
719 			cpumask_clear(pr->performance->shared_cpu_map);
720 			cpumask_set_cpu(i, pr->performance->shared_cpu_map);
721 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_NONE;
722 		}
723 		pr->performance = NULL; /* Will be set for real in register */
724 	}
725 
726 err_out:
727 	mutex_unlock(&performance_mutex);
728 	free_cpumask_var(covered_cpus);
729 	return retval;
730 }
731 EXPORT_SYMBOL(acpi_processor_preregister_performance);
732 
733 int acpi_processor_register_performance(struct acpi_processor_performance
734 					*performance, unsigned int cpu)
735 {
736 	struct acpi_processor *pr;
737 
738 	if (!acpi_processor_cpufreq_init)
739 		return -EINVAL;
740 
741 	mutex_lock(&performance_mutex);
742 
743 	pr = per_cpu(processors, cpu);
744 	if (!pr) {
745 		mutex_unlock(&performance_mutex);
746 		return -ENODEV;
747 	}
748 
749 	if (pr->performance) {
750 		mutex_unlock(&performance_mutex);
751 		return -EBUSY;
752 	}
753 
754 	WARN_ON(!performance);
755 
756 	pr->performance = performance;
757 
758 	if (acpi_processor_get_performance_info(pr)) {
759 		pr->performance = NULL;
760 		mutex_unlock(&performance_mutex);
761 		return -EIO;
762 	}
763 
764 	mutex_unlock(&performance_mutex);
765 	return 0;
766 }
767 EXPORT_SYMBOL(acpi_processor_register_performance);
768 
769 void acpi_processor_unregister_performance(unsigned int cpu)
770 {
771 	struct acpi_processor *pr;
772 
773 	mutex_lock(&performance_mutex);
774 
775 	pr = per_cpu(processors, cpu);
776 	if (!pr)
777 		goto unlock;
778 
779 	if (pr->performance)
780 		kfree(pr->performance->states);
781 
782 	pr->performance = NULL;
783 
784 unlock:
785 	mutex_unlock(&performance_mutex);
786 }
787 EXPORT_SYMBOL(acpi_processor_unregister_performance);
788 #endif
789