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 
acpi_processor_get_platform_limit(struct acpi_processor * pr)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  */
acpi_processor_ppc_ost(acpi_handle handle,int status)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 
acpi_processor_ppc_has_changed(struct acpi_processor * pr,int event_flag)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 
acpi_processor_get_bios_limit(int cpu,unsigned int * limit)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 
acpi_processor_ignore_ppc_init(void)151 void acpi_processor_ignore_ppc_init(void)
152 {
153 	if (ignore_ppc < 0)
154 		ignore_ppc = 0;
155 }
156 
acpi_processor_ppc_init(struct cpufreq_policy * policy)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 
acpi_processor_ppc_exit(struct cpufreq_policy * policy)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 
acpi_processor_get_performance_control(struct acpi_processor * pr)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 	status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
198 	if (ACPI_FAILURE(status)) {
199 		acpi_evaluation_failure_warn(pr->handle, "_PCT", status);
200 		return -ENODEV;
201 	}
202 
203 	pct = (union acpi_object *)buffer.pointer;
204 	if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
205 	    || (pct->package.count != 2)) {
206 		pr_err("Invalid _PCT data\n");
207 		result = -EFAULT;
208 		goto end;
209 	}
210 
211 	/*
212 	 * control_register
213 	 */
214 
215 	obj = pct->package.elements[0];
216 
217 	if ((obj.type != ACPI_TYPE_BUFFER)
218 	    || (obj.buffer.length < sizeof(struct acpi_pct_register))
219 	    || (obj.buffer.pointer == NULL)) {
220 		pr_err("Invalid _PCT data (control_register)\n");
221 		result = -EFAULT;
222 		goto end;
223 	}
224 	memcpy(&pr->performance->control_register, obj.buffer.pointer,
225 	       sizeof(struct acpi_pct_register));
226 
227 	/*
228 	 * status_register
229 	 */
230 
231 	obj = pct->package.elements[1];
232 
233 	if ((obj.type != ACPI_TYPE_BUFFER)
234 	    || (obj.buffer.length < sizeof(struct acpi_pct_register))
235 	    || (obj.buffer.pointer == NULL)) {
236 		pr_err("Invalid _PCT data (status_register)\n");
237 		result = -EFAULT;
238 		goto end;
239 	}
240 
241 	memcpy(&pr->performance->status_register, obj.buffer.pointer,
242 	       sizeof(struct acpi_pct_register));
243 
244 end:
245 	kfree(buffer.pointer);
246 
247 	return result;
248 }
249 
250 #ifdef CONFIG_X86
251 /*
252  * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
253  * in their ACPI data. Calculate the real values and fix up the _PSS data.
254  */
amd_fixup_frequency(struct acpi_processor_px * px,int i)255 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
256 {
257 	u32 hi, lo, fid, did;
258 	int index = px->control & 0x00000007;
259 
260 	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
261 		return;
262 
263 	if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
264 	    || boot_cpu_data.x86 == 0x11) {
265 		rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
266 		/*
267 		 * MSR C001_0064+:
268 		 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
269 		 */
270 		if (!(hi & BIT(31)))
271 			return;
272 
273 		fid = lo & 0x3f;
274 		did = (lo >> 6) & 7;
275 		if (boot_cpu_data.x86 == 0x10)
276 			px->core_frequency = (100 * (fid + 0x10)) >> did;
277 		else
278 			px->core_frequency = (100 * (fid + 8)) >> did;
279 	}
280 }
281 #else
amd_fixup_frequency(struct acpi_processor_px * px,int i)282 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
283 #endif
284 
acpi_processor_get_performance_states(struct acpi_processor * pr)285 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
286 {
287 	int result = 0;
288 	acpi_status status = AE_OK;
289 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
290 	struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
291 	struct acpi_buffer state = { 0, NULL };
292 	union acpi_object *pss = NULL;
293 	int i;
294 	int last_invalid = -1;
295 
296 	status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
297 	if (ACPI_FAILURE(status)) {
298 		acpi_evaluation_failure_warn(pr->handle, "_PSS", status);
299 		return -ENODEV;
300 	}
301 
302 	pss = buffer.pointer;
303 	if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
304 		pr_err("Invalid _PSS data\n");
305 		result = -EFAULT;
306 		goto end;
307 	}
308 
309 	acpi_handle_debug(pr->handle, "Found %d performance states\n",
310 			  pss->package.count);
311 
312 	pr->performance->state_count = pss->package.count;
313 	pr->performance->states =
314 	    kmalloc_array(pss->package.count,
315 			  sizeof(struct acpi_processor_px),
316 			  GFP_KERNEL);
317 	if (!pr->performance->states) {
318 		result = -ENOMEM;
319 		goto end;
320 	}
321 
322 	for (i = 0; i < pr->performance->state_count; i++) {
323 
324 		struct acpi_processor_px *px = &(pr->performance->states[i]);
325 
326 		state.length = sizeof(struct acpi_processor_px);
327 		state.pointer = px;
328 
329 		acpi_handle_debug(pr->handle, "Extracting state %d\n", i);
330 
331 		status = acpi_extract_package(&(pss->package.elements[i]),
332 					      &format, &state);
333 		if (ACPI_FAILURE(status)) {
334 			acpi_handle_warn(pr->handle, "Invalid _PSS data: %s\n",
335 					 acpi_format_exception(status));
336 			result = -EFAULT;
337 			kfree(pr->performance->states);
338 			goto end;
339 		}
340 
341 		amd_fixup_frequency(px, i);
342 
343 		acpi_handle_debug(pr->handle,
344 				  "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
345 				  i,
346 				  (u32) px->core_frequency,
347 				  (u32) px->power,
348 				  (u32) px->transition_latency,
349 				  (u32) px->bus_master_latency,
350 				  (u32) px->control, (u32) px->status);
351 
352 		/*
353 		 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
354 		 */
355 		if (!px->core_frequency ||
356 		    ((u32)(px->core_frequency * 1000) !=
357 		     (px->core_frequency * 1000))) {
358 			pr_err(FW_BUG
359 			       "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
360 			       pr->id, px->core_frequency);
361 			if (last_invalid == -1)
362 				last_invalid = i;
363 		} else {
364 			if (last_invalid != -1) {
365 				/*
366 				 * Copy this valid entry over last_invalid entry
367 				 */
368 				memcpy(&(pr->performance->states[last_invalid]),
369 				       px, sizeof(struct acpi_processor_px));
370 				++last_invalid;
371 			}
372 		}
373 	}
374 
375 	if (last_invalid == 0) {
376 		pr_err(FW_BUG
377 			   "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
378 		result = -EFAULT;
379 		kfree(pr->performance->states);
380 		pr->performance->states = NULL;
381 	}
382 
383 	if (last_invalid > 0)
384 		pr->performance->state_count = last_invalid;
385 
386 end:
387 	kfree(buffer.pointer);
388 
389 	return result;
390 }
391 
acpi_processor_get_performance_info(struct acpi_processor * pr)392 int acpi_processor_get_performance_info(struct acpi_processor *pr)
393 {
394 	int result = 0;
395 
396 	if (!pr || !pr->performance || !pr->handle)
397 		return -EINVAL;
398 
399 	if (!acpi_has_method(pr->handle, "_PCT")) {
400 		acpi_handle_debug(pr->handle,
401 				  "ACPI-based processor performance control unavailable\n");
402 		return -ENODEV;
403 	}
404 
405 	result = acpi_processor_get_performance_control(pr);
406 	if (result)
407 		goto update_bios;
408 
409 	result = acpi_processor_get_performance_states(pr);
410 	if (result)
411 		goto update_bios;
412 
413 	/* We need to call _PPC once when cpufreq starts */
414 	if (ignore_ppc != 1)
415 		result = acpi_processor_get_platform_limit(pr);
416 
417 	return result;
418 
419 	/*
420 	 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
421 	 * the BIOS is older than the CPU and does not know its frequencies
422 	 */
423  update_bios:
424 #ifdef CONFIG_X86
425 	if (acpi_has_method(pr->handle, "_PPC")) {
426 		if(boot_cpu_has(X86_FEATURE_EST))
427 			pr_warn(FW_BUG "BIOS needs update for CPU "
428 			       "frequency support\n");
429 	}
430 #endif
431 	return result;
432 }
433 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
434 
acpi_processor_pstate_control(void)435 int acpi_processor_pstate_control(void)
436 {
437 	acpi_status status;
438 
439 	if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
440 		return 0;
441 
442 	pr_debug("Writing pstate_control [0x%x] to smi_command [0x%x]\n",
443 		 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command);
444 
445 	status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
446 				    (u32)acpi_gbl_FADT.pstate_control, 8);
447 	if (ACPI_SUCCESS(status))
448 		return 1;
449 
450 	pr_warn("Failed to write pstate_control [0x%x] to smi_command [0x%x]: %s\n",
451 		acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command,
452 		acpi_format_exception(status));
453 	return -EIO;
454 }
455 
acpi_processor_notify_smm(struct module * calling_module)456 int acpi_processor_notify_smm(struct module *calling_module)
457 {
458 	static int is_done;
459 	int result;
460 
461 	if (!acpi_processor_cpufreq_init)
462 		return -EBUSY;
463 
464 	if (!try_module_get(calling_module))
465 		return -EINVAL;
466 
467 	/* is_done is set to negative if an error occurred,
468 	 * and to postitive if _no_ error occurred, but SMM
469 	 * was already notified. This avoids double notification
470 	 * which might lead to unexpected results...
471 	 */
472 	if (is_done > 0) {
473 		module_put(calling_module);
474 		return 0;
475 	} else if (is_done < 0) {
476 		module_put(calling_module);
477 		return is_done;
478 	}
479 
480 	is_done = -EIO;
481 
482 	result = acpi_processor_pstate_control();
483 	if (!result) {
484 		pr_debug("No SMI port or pstate_control\n");
485 		module_put(calling_module);
486 		return 0;
487 	}
488 	if (result < 0) {
489 		module_put(calling_module);
490 		return result;
491 	}
492 
493 	/* Success. If there's no _PPC, we need to fear nothing, so
494 	 * we can allow the cpufreq driver to be rmmod'ed. */
495 	is_done = 1;
496 
497 	if (!acpi_processor_ppc_in_use)
498 		module_put(calling_module);
499 
500 	return 0;
501 }
502 
503 EXPORT_SYMBOL(acpi_processor_notify_smm);
504 
acpi_processor_get_psd(acpi_handle handle,struct acpi_psd_package * pdomain)505 int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)
506 {
507 	int result = 0;
508 	acpi_status status = AE_OK;
509 	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
510 	struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
511 	struct acpi_buffer state = {0, NULL};
512 	union acpi_object  *psd = NULL;
513 
514 	status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer);
515 	if (ACPI_FAILURE(status)) {
516 		return -ENODEV;
517 	}
518 
519 	psd = buffer.pointer;
520 	if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
521 		pr_err("Invalid _PSD data\n");
522 		result = -EFAULT;
523 		goto end;
524 	}
525 
526 	if (psd->package.count != 1) {
527 		pr_err("Invalid _PSD data\n");
528 		result = -EFAULT;
529 		goto end;
530 	}
531 
532 	state.length = sizeof(struct acpi_psd_package);
533 	state.pointer = pdomain;
534 
535 	status = acpi_extract_package(&(psd->package.elements[0]),
536 		&format, &state);
537 	if (ACPI_FAILURE(status)) {
538 		pr_err("Invalid _PSD data\n");
539 		result = -EFAULT;
540 		goto end;
541 	}
542 
543 	if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
544 		pr_err("Unknown _PSD:num_entries\n");
545 		result = -EFAULT;
546 		goto end;
547 	}
548 
549 	if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
550 		pr_err("Unknown _PSD:revision\n");
551 		result = -EFAULT;
552 		goto end;
553 	}
554 
555 	if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
556 	    pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
557 	    pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
558 		pr_err("Invalid _PSD:coord_type\n");
559 		result = -EFAULT;
560 		goto end;
561 	}
562 end:
563 	kfree(buffer.pointer);
564 	return result;
565 }
566 EXPORT_SYMBOL(acpi_processor_get_psd);
567 
acpi_processor_preregister_performance(struct acpi_processor_performance __percpu * performance)568 int acpi_processor_preregister_performance(
569 		struct acpi_processor_performance __percpu *performance)
570 {
571 	int count_target;
572 	int retval = 0;
573 	unsigned int i, j;
574 	cpumask_var_t covered_cpus;
575 	struct acpi_processor *pr;
576 	struct acpi_psd_package *pdomain;
577 	struct acpi_processor *match_pr;
578 	struct acpi_psd_package *match_pdomain;
579 
580 	if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
581 		return -ENOMEM;
582 
583 	mutex_lock(&performance_mutex);
584 
585 	/*
586 	 * Check if another driver has already registered, and abort before
587 	 * changing pr->performance if it has. Check input data as well.
588 	 */
589 	for_each_possible_cpu(i) {
590 		pr = per_cpu(processors, i);
591 		if (!pr) {
592 			/* Look only at processors in ACPI namespace */
593 			continue;
594 		}
595 
596 		if (pr->performance) {
597 			retval = -EBUSY;
598 			goto err_out;
599 		}
600 
601 		if (!performance || !per_cpu_ptr(performance, i)) {
602 			retval = -EINVAL;
603 			goto err_out;
604 		}
605 	}
606 
607 	/* Call _PSD for all CPUs */
608 	for_each_possible_cpu(i) {
609 		pr = per_cpu(processors, i);
610 		if (!pr)
611 			continue;
612 
613 		pr->performance = per_cpu_ptr(performance, i);
614 		pdomain = &(pr->performance->domain_info);
615 		if (acpi_processor_get_psd(pr->handle, pdomain)) {
616 			retval = -EINVAL;
617 			continue;
618 		}
619 	}
620 	if (retval)
621 		goto err_ret;
622 
623 	/*
624 	 * Now that we have _PSD data from all CPUs, lets setup P-state
625 	 * domain info.
626 	 */
627 	for_each_possible_cpu(i) {
628 		pr = per_cpu(processors, i);
629 		if (!pr)
630 			continue;
631 
632 		if (cpumask_test_cpu(i, covered_cpus))
633 			continue;
634 
635 		pdomain = &(pr->performance->domain_info);
636 		cpumask_set_cpu(i, pr->performance->shared_cpu_map);
637 		cpumask_set_cpu(i, covered_cpus);
638 		if (pdomain->num_processors <= 1)
639 			continue;
640 
641 		/* Validate the Domain info */
642 		count_target = pdomain->num_processors;
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 			cpumask_set_cpu(j, covered_cpus);
675 			cpumask_set_cpu(j, pr->performance->shared_cpu_map);
676 		}
677 
678 		for_each_possible_cpu(j) {
679 			if (i == j)
680 				continue;
681 
682 			match_pr = per_cpu(processors, j);
683 			if (!match_pr)
684 				continue;
685 
686 			match_pdomain = &(match_pr->performance->domain_info);
687 			if (match_pdomain->domain != pdomain->domain)
688 				continue;
689 
690 			match_pr->performance->shared_type =
691 					pr->performance->shared_type;
692 			cpumask_copy(match_pr->performance->shared_cpu_map,
693 				     pr->performance->shared_cpu_map);
694 		}
695 	}
696 
697 err_ret:
698 	for_each_possible_cpu(i) {
699 		pr = per_cpu(processors, i);
700 		if (!pr || !pr->performance)
701 			continue;
702 
703 		/* Assume no coordination on any error parsing domain info */
704 		if (retval) {
705 			cpumask_clear(pr->performance->shared_cpu_map);
706 			cpumask_set_cpu(i, pr->performance->shared_cpu_map);
707 			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_NONE;
708 		}
709 		pr->performance = NULL; /* Will be set for real in register */
710 	}
711 
712 err_out:
713 	mutex_unlock(&performance_mutex);
714 	free_cpumask_var(covered_cpus);
715 	return retval;
716 }
717 EXPORT_SYMBOL(acpi_processor_preregister_performance);
718 
719 int
acpi_processor_register_performance(struct acpi_processor_performance * performance,unsigned int cpu)720 acpi_processor_register_performance(struct acpi_processor_performance
721 				    *performance, unsigned int cpu)
722 {
723 	struct acpi_processor *pr;
724 
725 	if (!acpi_processor_cpufreq_init)
726 		return -EINVAL;
727 
728 	mutex_lock(&performance_mutex);
729 
730 	pr = per_cpu(processors, cpu);
731 	if (!pr) {
732 		mutex_unlock(&performance_mutex);
733 		return -ENODEV;
734 	}
735 
736 	if (pr->performance) {
737 		mutex_unlock(&performance_mutex);
738 		return -EBUSY;
739 	}
740 
741 	WARN_ON(!performance);
742 
743 	pr->performance = performance;
744 
745 	if (acpi_processor_get_performance_info(pr)) {
746 		pr->performance = NULL;
747 		mutex_unlock(&performance_mutex);
748 		return -EIO;
749 	}
750 
751 	mutex_unlock(&performance_mutex);
752 	return 0;
753 }
754 
755 EXPORT_SYMBOL(acpi_processor_register_performance);
756 
acpi_processor_unregister_performance(unsigned int cpu)757 void acpi_processor_unregister_performance(unsigned int cpu)
758 {
759 	struct acpi_processor *pr;
760 
761 	mutex_lock(&performance_mutex);
762 
763 	pr = per_cpu(processors, cpu);
764 	if (!pr) {
765 		mutex_unlock(&performance_mutex);
766 		return;
767 	}
768 
769 	if (pr->performance)
770 		kfree(pr->performance->states);
771 	pr->performance = NULL;
772 
773 	mutex_unlock(&performance_mutex);
774 
775 	return;
776 }
777 
778 EXPORT_SYMBOL(acpi_processor_unregister_performance);
779