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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
41ACPI_MODULE_NAME("processor_perflib");
42
43static 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 */
61static int ignore_ppc = -1;
62module_param(ignore_ppc, int, 0644);
63MODULE_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
69static int acpi_processor_ppc_status;
70
71static 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
110static struct notifier_block acpi_ppc_notifier_block = {
111 .notifier_call = acpi_processor_ppc_notifier,
112};
113
114static 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 */
153static 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
160int 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
191int 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}
202EXPORT_SYMBOL(acpi_processor_get_bios_limit);
203
204void 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
214void 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
223static 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 */
290static 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
317static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
318#endif
319
320static 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
426int 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}
467EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
468int 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
527EXPORT_SYMBOL(acpi_processor_notify_smm);
528
529static 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 }
589end:
590 kfree(buffer.pointer);
591 return result;
592}
593
594int 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
723err_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
738err_out:
739 mutex_unlock(&performance_mutex);
740 free_cpumask_var(covered_cpus);
741 return retval;
742}
743EXPORT_SYMBOL(acpi_processor_preregister_performance);
744
745int
746acpi_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
781EXPORT_SYMBOL(acpi_processor_register_performance);
782
783void 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
804EXPORT_SYMBOL(acpi_processor_unregister_performance);
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
27static 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 */
45static int ignore_ppc = -1;
46module_param(ignore_ppc, int, 0644);
47MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
48 "limited by BIOS, this should help");
49
50static bool acpi_processor_ppc_in_use;
51
52static 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 */
102static 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
109void 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
138int 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}
149EXPORT_SYMBOL(acpi_processor_get_bios_limit);
150
151void acpi_processor_ignore_ppc_init(void)
152{
153 if (ignore_ppc < 0)
154 ignore_ppc = 0;
155}
156
157void 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
177void 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
189static 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
244end:
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 */
255static 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
282static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
283#endif
284
285static 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
386end:
387 kfree(buffer.pointer);
388
389 return result;
390}
391
392int 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}
433EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
434
435int 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
456int 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
503EXPORT_SYMBOL(acpi_processor_notify_smm);
504
505int 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 }
562end:
563 kfree(buffer.pointer);
564 return result;
565}
566EXPORT_SYMBOL(acpi_processor_get_psd);
567
568int 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
697err_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
712err_out:
713 mutex_unlock(&performance_mutex);
714 free_cpumask_var(covered_cpus);
715 return retval;
716}
717EXPORT_SYMBOL(acpi_processor_preregister_performance);
718
719int
720acpi_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
755EXPORT_SYMBOL(acpi_processor_register_performance);
756
757void 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
778EXPORT_SYMBOL(acpi_processor_unregister_performance);