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