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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/*
28 * _PPC support is implemented as a CPUfreq policy notifier:
29 * This means each time a CPUfreq driver registered also with
30 * the ACPI core is asked to change the speed policy, the maximum
31 * value is adjusted so that it is within the platform limit.
32 *
33 * Also, when a new platform limit value is detected, the CPUfreq
34 * policy is adjusted accordingly.
35 */
36
37/* ignore_ppc:
38 * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
39 * ignore _PPC
40 * 0 -> cpufreq low level drivers initialized -> consider _PPC values
41 * 1 -> ignore _PPC totally -> forced by user through boot param
42 */
43static int ignore_ppc = -1;
44module_param(ignore_ppc, int, 0644);
45MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
46 "limited by BIOS, this should help");
47
48static bool acpi_processor_ppc_in_use;
49
50static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
51{
52 acpi_status status = 0;
53 unsigned long long ppc = 0;
54 s32 qos_value;
55 int index;
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 index = ppc;
76
77 if (pr->performance_platform_limit == index ||
78 ppc >= pr->performance->state_count)
79 return 0;
80
81 pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
82 index, index ? "is" : "is not");
83
84 pr->performance_platform_limit = index;
85
86 if (unlikely(!freq_qos_request_active(&pr->perflib_req)))
87 return 0;
88
89 /*
90 * If _PPC returns 0, it means that all of the available states can be
91 * used ("no limit").
92 */
93 if (index == 0)
94 qos_value = FREQ_QOS_MAX_DEFAULT_VALUE;
95 else
96 qos_value = pr->performance->states[index].core_frequency * 1000;
97
98 ret = freq_qos_update_request(&pr->perflib_req, qos_value);
99 if (ret < 0) {
100 pr_warn("Failed to update perflib freq constraint: CPU%d (%d)\n",
101 pr->id, ret);
102 }
103
104 return 0;
105}
106
107#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
108/*
109 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
110 * @handle: ACPI processor handle
111 * @status: the status code of _PPC evaluation
112 * 0: success. OSPM is now using the performance state specified.
113 * 1: failure. OSPM has not changed the number of P-states in use
114 */
115static void acpi_processor_ppc_ost(acpi_handle handle, int status)
116{
117 if (acpi_has_method(handle, "_OST"))
118 acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
119 status, NULL);
120}
121
122void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
123{
124 int ret;
125
126 if (ignore_ppc || !pr->performance) {
127 /*
128 * Only when it is notification event, the _OST object
129 * will be evaluated. Otherwise it is skipped.
130 */
131 if (event_flag)
132 acpi_processor_ppc_ost(pr->handle, 1);
133 return;
134 }
135
136 ret = acpi_processor_get_platform_limit(pr);
137 /*
138 * Only when it is notification event, the _OST object
139 * will be evaluated. Otherwise it is skipped.
140 */
141 if (event_flag) {
142 if (ret < 0)
143 acpi_processor_ppc_ost(pr->handle, 1);
144 else
145 acpi_processor_ppc_ost(pr->handle, 0);
146 }
147 if (ret >= 0)
148 cpufreq_update_limits(pr->id);
149}
150
151int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
152{
153 struct acpi_processor *pr;
154
155 pr = per_cpu(processors, cpu);
156 if (!pr || !pr->performance || !pr->performance->state_count)
157 return -ENODEV;
158
159 *limit = pr->performance->states[pr->performance_platform_limit].
160 core_frequency * 1000;
161 return 0;
162}
163EXPORT_SYMBOL(acpi_processor_get_bios_limit);
164
165void acpi_processor_ignore_ppc_init(void)
166{
167 if (ignore_ppc < 0)
168 ignore_ppc = 0;
169}
170
171void acpi_processor_ppc_init(struct cpufreq_policy *policy)
172{
173 unsigned int cpu;
174
175 for_each_cpu(cpu, policy->related_cpus) {
176 struct acpi_processor *pr = per_cpu(processors, cpu);
177 int ret;
178
179 if (!pr)
180 continue;
181
182 /*
183 * Reset performance_platform_limit in case there is a stale
184 * value in it, so as to make it match the "no limit" QoS value
185 * below.
186 */
187 pr->performance_platform_limit = 0;
188
189 ret = freq_qos_add_request(&policy->constraints,
190 &pr->perflib_req, FREQ_QOS_MAX,
191 FREQ_QOS_MAX_DEFAULT_VALUE);
192 if (ret < 0)
193 pr_err("Failed to add freq constraint for CPU%d (%d)\n",
194 cpu, ret);
195 }
196}
197
198void acpi_processor_ppc_exit(struct cpufreq_policy *policy)
199{
200 unsigned int cpu;
201
202 for_each_cpu(cpu, policy->related_cpus) {
203 struct acpi_processor *pr = per_cpu(processors, cpu);
204
205 if (pr)
206 freq_qos_remove_request(&pr->perflib_req);
207 }
208}
209
210#ifdef CONFIG_X86
211
212static DEFINE_MUTEX(performance_mutex);
213
214static int acpi_processor_get_performance_control(struct acpi_processor *pr)
215{
216 int result = 0;
217 acpi_status status = 0;
218 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
219 union acpi_object *pct = NULL;
220 union acpi_object obj = { 0 };
221
222 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
223 if (ACPI_FAILURE(status)) {
224 acpi_evaluation_failure_warn(pr->handle, "_PCT", status);
225 return -ENODEV;
226 }
227
228 pct = (union acpi_object *)buffer.pointer;
229 if (!pct || pct->type != ACPI_TYPE_PACKAGE || pct->package.count != 2) {
230 pr_err("Invalid _PCT data\n");
231 result = -EFAULT;
232 goto end;
233 }
234
235 /*
236 * control_register
237 */
238
239 obj = pct->package.elements[0];
240
241 if (!obj.buffer.pointer || obj.type != ACPI_TYPE_BUFFER ||
242 obj.buffer.length < sizeof(struct acpi_pct_register)) {
243 pr_err("Invalid _PCT data (control_register)\n");
244 result = -EFAULT;
245 goto end;
246 }
247 memcpy(&pr->performance->control_register, obj.buffer.pointer,
248 sizeof(struct acpi_pct_register));
249
250 /*
251 * status_register
252 */
253
254 obj = pct->package.elements[1];
255
256 if (!obj.buffer.pointer || obj.type != ACPI_TYPE_BUFFER ||
257 obj.buffer.length < sizeof(struct acpi_pct_register)) {
258 pr_err("Invalid _PCT data (status_register)\n");
259 result = -EFAULT;
260 goto end;
261 }
262
263 memcpy(&pr->performance->status_register, obj.buffer.pointer,
264 sizeof(struct acpi_pct_register));
265
266end:
267 kfree(buffer.pointer);
268
269 return result;
270}
271
272/*
273 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
274 * in their ACPI data. Calculate the real values and fix up the _PSS data.
275 */
276static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
277{
278 u32 hi, lo, fid, did;
279 int index = px->control & 0x00000007;
280
281 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
282 return;
283
284 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) ||
285 boot_cpu_data.x86 == 0x11) {
286 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
287 /*
288 * MSR C001_0064+:
289 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
290 */
291 if (!(hi & BIT(31)))
292 return;
293
294 fid = lo & 0x3f;
295 did = (lo >> 6) & 7;
296 if (boot_cpu_data.x86 == 0x10)
297 px->core_frequency = (100 * (fid + 0x10)) >> did;
298 else
299 px->core_frequency = (100 * (fid + 8)) >> did;
300 }
301}
302
303static int acpi_processor_get_performance_states(struct acpi_processor *pr)
304{
305 int result = 0;
306 acpi_status status = AE_OK;
307 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
308 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
309 struct acpi_buffer state = { 0, NULL };
310 union acpi_object *pss = NULL;
311 int i;
312 int last_invalid = -1;
313
314 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
315 if (ACPI_FAILURE(status)) {
316 acpi_evaluation_failure_warn(pr->handle, "_PSS", status);
317 return -ENODEV;
318 }
319
320 pss = buffer.pointer;
321 if (!pss || pss->type != ACPI_TYPE_PACKAGE) {
322 pr_err("Invalid _PSS data\n");
323 result = -EFAULT;
324 goto end;
325 }
326
327 acpi_handle_debug(pr->handle, "Found %d performance states\n",
328 pss->package.count);
329
330 pr->performance->state_count = pss->package.count;
331 pr->performance->states =
332 kmalloc_array(pss->package.count,
333 sizeof(struct acpi_processor_px),
334 GFP_KERNEL);
335 if (!pr->performance->states) {
336 result = -ENOMEM;
337 goto end;
338 }
339
340 for (i = 0; i < pr->performance->state_count; i++) {
341
342 struct acpi_processor_px *px = &(pr->performance->states[i]);
343
344 state.length = sizeof(struct acpi_processor_px);
345 state.pointer = px;
346
347 acpi_handle_debug(pr->handle, "Extracting state %d\n", i);
348
349 status = acpi_extract_package(&(pss->package.elements[i]),
350 &format, &state);
351 if (ACPI_FAILURE(status)) {
352 acpi_handle_warn(pr->handle, "Invalid _PSS data: %s\n",
353 acpi_format_exception(status));
354 result = -EFAULT;
355 kfree(pr->performance->states);
356 goto end;
357 }
358
359 amd_fixup_frequency(px, i);
360
361 acpi_handle_debug(pr->handle,
362 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
363 i,
364 (u32) px->core_frequency,
365 (u32) px->power,
366 (u32) px->transition_latency,
367 (u32) px->bus_master_latency,
368 (u32) px->control, (u32) px->status);
369
370 /*
371 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
372 */
373 if (!px->core_frequency ||
374 (u32)(px->core_frequency * 1000) != px->core_frequency * 1000) {
375 pr_err(FW_BUG
376 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
377 pr->id, px->core_frequency);
378 if (last_invalid == -1)
379 last_invalid = i;
380 } else {
381 if (last_invalid != -1) {
382 /*
383 * Copy this valid entry over last_invalid entry
384 */
385 memcpy(&(pr->performance->states[last_invalid]),
386 px, sizeof(struct acpi_processor_px));
387 ++last_invalid;
388 }
389 }
390 }
391
392 if (last_invalid == 0) {
393 pr_err(FW_BUG
394 "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
395 result = -EFAULT;
396 kfree(pr->performance->states);
397 pr->performance->states = NULL;
398 }
399
400 if (last_invalid > 0)
401 pr->performance->state_count = last_invalid;
402
403end:
404 kfree(buffer.pointer);
405
406 return result;
407}
408
409int acpi_processor_get_performance_info(struct acpi_processor *pr)
410{
411 int result = 0;
412
413 if (!pr || !pr->performance || !pr->handle)
414 return -EINVAL;
415
416 if (!acpi_has_method(pr->handle, "_PCT")) {
417 acpi_handle_debug(pr->handle,
418 "ACPI-based processor performance control unavailable\n");
419 return -ENODEV;
420 }
421
422 result = acpi_processor_get_performance_control(pr);
423 if (result)
424 goto update_bios;
425
426 result = acpi_processor_get_performance_states(pr);
427 if (result)
428 goto update_bios;
429
430 /* We need to call _PPC once when cpufreq starts */
431 if (ignore_ppc != 1)
432 result = acpi_processor_get_platform_limit(pr);
433
434 return result;
435
436 /*
437 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
438 * the BIOS is older than the CPU and does not know its frequencies
439 */
440 update_bios:
441 if (acpi_has_method(pr->handle, "_PPC")) {
442 if(boot_cpu_has(X86_FEATURE_EST))
443 pr_warn(FW_BUG "BIOS needs update for CPU "
444 "frequency support\n");
445 }
446 return result;
447}
448EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
449
450int acpi_processor_pstate_control(void)
451{
452 acpi_status status;
453
454 if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
455 return 0;
456
457 pr_debug("Writing pstate_control [0x%x] to smi_command [0x%x]\n",
458 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command);
459
460 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
461 (u32)acpi_gbl_FADT.pstate_control, 8);
462 if (ACPI_SUCCESS(status))
463 return 1;
464
465 pr_warn("Failed to write pstate_control [0x%x] to smi_command [0x%x]: %s\n",
466 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command,
467 acpi_format_exception(status));
468 return -EIO;
469}
470
471int acpi_processor_notify_smm(struct module *calling_module)
472{
473 static int is_done;
474 int result = 0;
475
476 if (!acpi_processor_cpufreq_init)
477 return -EBUSY;
478
479 if (!try_module_get(calling_module))
480 return -EINVAL;
481
482 /*
483 * is_done is set to negative if an error occurs and to 1 if no error
484 * occurrs, but SMM has been notified already. This avoids repeated
485 * notification which might lead to unexpected results.
486 */
487 if (is_done != 0) {
488 if (is_done < 0)
489 result = is_done;
490
491 goto out_put;
492 }
493
494 result = acpi_processor_pstate_control();
495 if (result <= 0) {
496 if (result) {
497 is_done = result;
498 } else {
499 pr_debug("No SMI port or pstate_control\n");
500 is_done = 1;
501 }
502 goto out_put;
503 }
504
505 is_done = 1;
506 /*
507 * Success. If there _PPC, unloading the cpufreq driver would be risky,
508 * so disallow it in that case.
509 */
510 if (acpi_processor_ppc_in_use)
511 return 0;
512
513out_put:
514 module_put(calling_module);
515 return result;
516}
517EXPORT_SYMBOL(acpi_processor_notify_smm);
518
519int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)
520{
521 int result = 0;
522 acpi_status status = AE_OK;
523 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
524 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
525 struct acpi_buffer state = {0, NULL};
526 union acpi_object *psd = NULL;
527
528 status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer);
529 if (ACPI_FAILURE(status)) {
530 return -ENODEV;
531 }
532
533 psd = buffer.pointer;
534 if (!psd || psd->type != ACPI_TYPE_PACKAGE) {
535 pr_err("Invalid _PSD data\n");
536 result = -EFAULT;
537 goto end;
538 }
539
540 if (psd->package.count != 1) {
541 pr_err("Invalid _PSD data\n");
542 result = -EFAULT;
543 goto end;
544 }
545
546 state.length = sizeof(struct acpi_psd_package);
547 state.pointer = pdomain;
548
549 status = acpi_extract_package(&(psd->package.elements[0]), &format, &state);
550 if (ACPI_FAILURE(status)) {
551 pr_err("Invalid _PSD data\n");
552 result = -EFAULT;
553 goto end;
554 }
555
556 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
557 pr_err("Unknown _PSD:num_entries\n");
558 result = -EFAULT;
559 goto end;
560 }
561
562 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
563 pr_err("Unknown _PSD:revision\n");
564 result = -EFAULT;
565 goto end;
566 }
567
568 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
569 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
570 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
571 pr_err("Invalid _PSD:coord_type\n");
572 result = -EFAULT;
573 goto end;
574 }
575end:
576 kfree(buffer.pointer);
577 return result;
578}
579EXPORT_SYMBOL(acpi_processor_get_psd);
580
581int acpi_processor_preregister_performance(
582 struct acpi_processor_performance __percpu *performance)
583{
584 int count_target;
585 int retval = 0;
586 unsigned int i, j;
587 cpumask_var_t covered_cpus;
588 struct acpi_processor *pr;
589 struct acpi_psd_package *pdomain;
590 struct acpi_processor *match_pr;
591 struct acpi_psd_package *match_pdomain;
592
593 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
594 return -ENOMEM;
595
596 mutex_lock(&performance_mutex);
597
598 /*
599 * Check if another driver has already registered, and abort before
600 * changing pr->performance if it has. Check input data as well.
601 */
602 for_each_possible_cpu(i) {
603 pr = per_cpu(processors, i);
604 if (!pr) {
605 /* Look only at processors in ACPI namespace */
606 continue;
607 }
608
609 if (pr->performance) {
610 retval = -EBUSY;
611 goto err_out;
612 }
613
614 if (!performance || !per_cpu_ptr(performance, i)) {
615 retval = -EINVAL;
616 goto err_out;
617 }
618 }
619
620 /* Call _PSD for all CPUs */
621 for_each_possible_cpu(i) {
622 pr = per_cpu(processors, i);
623 if (!pr)
624 continue;
625
626 pr->performance = per_cpu_ptr(performance, i);
627 pdomain = &(pr->performance->domain_info);
628 if (acpi_processor_get_psd(pr->handle, pdomain)) {
629 retval = -EINVAL;
630 continue;
631 }
632 }
633 if (retval)
634 goto err_ret;
635
636 /*
637 * Now that we have _PSD data from all CPUs, lets setup P-state
638 * domain info.
639 */
640 for_each_possible_cpu(i) {
641 pr = per_cpu(processors, i);
642 if (!pr)
643 continue;
644
645 if (cpumask_test_cpu(i, covered_cpus))
646 continue;
647
648 pdomain = &(pr->performance->domain_info);
649 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
650 cpumask_set_cpu(i, covered_cpus);
651 if (pdomain->num_processors <= 1)
652 continue;
653
654 /* Validate the Domain info */
655 count_target = pdomain->num_processors;
656 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
657 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
658 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
659 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
660 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
661 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
662
663 for_each_possible_cpu(j) {
664 if (i == j)
665 continue;
666
667 match_pr = per_cpu(processors, j);
668 if (!match_pr)
669 continue;
670
671 match_pdomain = &(match_pr->performance->domain_info);
672 if (match_pdomain->domain != pdomain->domain)
673 continue;
674
675 /* Here i and j are in the same domain */
676
677 if (match_pdomain->num_processors != count_target) {
678 retval = -EINVAL;
679 goto err_ret;
680 }
681
682 if (pdomain->coord_type != match_pdomain->coord_type) {
683 retval = -EINVAL;
684 goto err_ret;
685 }
686
687 cpumask_set_cpu(j, covered_cpus);
688 cpumask_set_cpu(j, pr->performance->shared_cpu_map);
689 }
690
691 for_each_possible_cpu(j) {
692 if (i == j)
693 continue;
694
695 match_pr = per_cpu(processors, j);
696 if (!match_pr)
697 continue;
698
699 match_pdomain = &(match_pr->performance->domain_info);
700 if (match_pdomain->domain != pdomain->domain)
701 continue;
702
703 match_pr->performance->shared_type =
704 pr->performance->shared_type;
705 cpumask_copy(match_pr->performance->shared_cpu_map,
706 pr->performance->shared_cpu_map);
707 }
708 }
709
710err_ret:
711 for_each_possible_cpu(i) {
712 pr = per_cpu(processors, i);
713 if (!pr || !pr->performance)
714 continue;
715
716 /* Assume no coordination on any error parsing domain info */
717 if (retval) {
718 cpumask_clear(pr->performance->shared_cpu_map);
719 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
720 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_NONE;
721 }
722 pr->performance = NULL; /* Will be set for real in register */
723 }
724
725err_out:
726 mutex_unlock(&performance_mutex);
727 free_cpumask_var(covered_cpus);
728 return retval;
729}
730EXPORT_SYMBOL(acpi_processor_preregister_performance);
731
732int acpi_processor_register_performance(struct acpi_processor_performance
733 *performance, unsigned int cpu)
734{
735 struct acpi_processor *pr;
736
737 if (!acpi_processor_cpufreq_init)
738 return -EINVAL;
739
740 mutex_lock(&performance_mutex);
741
742 pr = per_cpu(processors, cpu);
743 if (!pr) {
744 mutex_unlock(&performance_mutex);
745 return -ENODEV;
746 }
747
748 if (pr->performance) {
749 mutex_unlock(&performance_mutex);
750 return -EBUSY;
751 }
752
753 WARN_ON(!performance);
754
755 pr->performance = performance;
756
757 if (acpi_processor_get_performance_info(pr)) {
758 pr->performance = NULL;
759 mutex_unlock(&performance_mutex);
760 return -EIO;
761 }
762
763 mutex_unlock(&performance_mutex);
764 return 0;
765}
766EXPORT_SYMBOL(acpi_processor_register_performance);
767
768void acpi_processor_unregister_performance(unsigned int cpu)
769{
770 struct acpi_processor *pr;
771
772 mutex_lock(&performance_mutex);
773
774 pr = per_cpu(processors, cpu);
775 if (!pr)
776 goto unlock;
777
778 if (pr->performance)
779 kfree(pr->performance->states);
780
781 pr->performance = NULL;
782
783unlock:
784 mutex_unlock(&performance_mutex);
785}
786EXPORT_SYMBOL(acpi_processor_unregister_performance);
787#endif
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 * You should have received a copy of the GNU General Public License along
24 * with this program; if not, write to the Free Software Foundation, Inc.,
25 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
26 *
27 */
28
29#include <linux/kernel.h>
30#include <linux/module.h>
31#include <linux/init.h>
32#include <linux/cpufreq.h>
33#include <linux/slab.h>
34
35#ifdef CONFIG_X86
36#include <asm/cpufeature.h>
37#endif
38
39#include <acpi/acpi_bus.h>
40#include <acpi/acpi_drivers.h>
41#include <acpi/processor.h>
42
43#define PREFIX "ACPI: "
44
45#define ACPI_PROCESSOR_CLASS "processor"
46#define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
47#define _COMPONENT ACPI_PROCESSOR_COMPONENT
48ACPI_MODULE_NAME("processor_perflib");
49
50static DEFINE_MUTEX(performance_mutex);
51
52/*
53 * _PPC support is implemented as a CPUfreq policy notifier:
54 * This means each time a CPUfreq driver registered also with
55 * the ACPI core is asked to change the speed policy, the maximum
56 * value is adjusted so that it is within the platform limit.
57 *
58 * Also, when a new platform limit value is detected, the CPUfreq
59 * policy is adjusted accordingly.
60 */
61
62/* ignore_ppc:
63 * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
64 * ignore _PPC
65 * 0 -> cpufreq low level drivers initialized -> consider _PPC values
66 * 1 -> ignore _PPC totally -> forced by user through boot param
67 */
68static int ignore_ppc = -1;
69module_param(ignore_ppc, int, 0644);
70MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
71 "limited by BIOS, this should help");
72
73#define PPC_REGISTERED 1
74#define PPC_IN_USE 2
75
76static int acpi_processor_ppc_status;
77
78static int acpi_processor_ppc_notifier(struct notifier_block *nb,
79 unsigned long event, void *data)
80{
81 struct cpufreq_policy *policy = data;
82 struct acpi_processor *pr;
83 unsigned int ppc = 0;
84
85 if (event == CPUFREQ_START && ignore_ppc <= 0) {
86 ignore_ppc = 0;
87 return 0;
88 }
89
90 if (ignore_ppc)
91 return 0;
92
93 if (event != CPUFREQ_INCOMPATIBLE)
94 return 0;
95
96 mutex_lock(&performance_mutex);
97
98 pr = per_cpu(processors, policy->cpu);
99 if (!pr || !pr->performance)
100 goto out;
101
102 ppc = (unsigned int)pr->performance_platform_limit;
103
104 if (ppc >= pr->performance->state_count)
105 goto out;
106
107 cpufreq_verify_within_limits(policy, 0,
108 pr->performance->states[ppc].
109 core_frequency * 1000);
110
111 out:
112 mutex_unlock(&performance_mutex);
113
114 return 0;
115}
116
117static struct notifier_block acpi_ppc_notifier_block = {
118 .notifier_call = acpi_processor_ppc_notifier,
119};
120
121static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
122{
123 acpi_status status = 0;
124 unsigned long long ppc = 0;
125
126
127 if (!pr)
128 return -EINVAL;
129
130 /*
131 * _PPC indicates the maximum state currently supported by the platform
132 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
133 */
134 status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
135
136 if (status != AE_NOT_FOUND)
137 acpi_processor_ppc_status |= PPC_IN_USE;
138
139 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
140 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
141 return -ENODEV;
142 }
143
144 pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
145 (int)ppc, ppc ? "" : "not");
146
147 pr->performance_platform_limit = (int)ppc;
148
149 return 0;
150}
151
152#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
153/*
154 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
155 * @handle: ACPI processor handle
156 * @status: the status code of _PPC evaluation
157 * 0: success. OSPM is now using the performance state specificed.
158 * 1: failure. OSPM has not changed the number of P-states in use
159 */
160static void acpi_processor_ppc_ost(acpi_handle handle, int status)
161{
162 union acpi_object params[2] = {
163 {.type = ACPI_TYPE_INTEGER,},
164 {.type = ACPI_TYPE_INTEGER,},
165 };
166 struct acpi_object_list arg_list = {2, params};
167 acpi_handle temp;
168
169 params[0].integer.value = ACPI_PROCESSOR_NOTIFY_PERFORMANCE;
170 params[1].integer.value = status;
171
172 /* when there is no _OST , skip it */
173 if (ACPI_FAILURE(acpi_get_handle(handle, "_OST", &temp)))
174 return;
175
176 acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
177 return;
178}
179
180int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
181{
182 int ret;
183
184 if (ignore_ppc) {
185 /*
186 * Only when it is notification event, the _OST object
187 * will be evaluated. Otherwise it is skipped.
188 */
189 if (event_flag)
190 acpi_processor_ppc_ost(pr->handle, 1);
191 return 0;
192 }
193
194 ret = acpi_processor_get_platform_limit(pr);
195 /*
196 * Only when it is notification event, the _OST object
197 * will be evaluated. Otherwise it is skipped.
198 */
199 if (event_flag) {
200 if (ret < 0)
201 acpi_processor_ppc_ost(pr->handle, 1);
202 else
203 acpi_processor_ppc_ost(pr->handle, 0);
204 }
205 if (ret < 0)
206 return (ret);
207 else
208 return cpufreq_update_policy(pr->id);
209}
210
211int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
212{
213 struct acpi_processor *pr;
214
215 pr = per_cpu(processors, cpu);
216 if (!pr || !pr->performance || !pr->performance->state_count)
217 return -ENODEV;
218 *limit = pr->performance->states[pr->performance_platform_limit].
219 core_frequency * 1000;
220 return 0;
221}
222EXPORT_SYMBOL(acpi_processor_get_bios_limit);
223
224void acpi_processor_ppc_init(void)
225{
226 if (!cpufreq_register_notifier
227 (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
228 acpi_processor_ppc_status |= PPC_REGISTERED;
229 else
230 printk(KERN_DEBUG
231 "Warning: Processor Platform Limit not supported.\n");
232}
233
234void acpi_processor_ppc_exit(void)
235{
236 if (acpi_processor_ppc_status & PPC_REGISTERED)
237 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
238 CPUFREQ_POLICY_NOTIFIER);
239
240 acpi_processor_ppc_status &= ~PPC_REGISTERED;
241}
242
243static int acpi_processor_get_performance_control(struct acpi_processor *pr)
244{
245 int result = 0;
246 acpi_status status = 0;
247 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
248 union acpi_object *pct = NULL;
249 union acpi_object obj = { 0 };
250
251
252 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
253 if (ACPI_FAILURE(status)) {
254 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
255 return -ENODEV;
256 }
257
258 pct = (union acpi_object *)buffer.pointer;
259 if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
260 || (pct->package.count != 2)) {
261 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
262 result = -EFAULT;
263 goto end;
264 }
265
266 /*
267 * control_register
268 */
269
270 obj = pct->package.elements[0];
271
272 if ((obj.type != ACPI_TYPE_BUFFER)
273 || (obj.buffer.length < sizeof(struct acpi_pct_register))
274 || (obj.buffer.pointer == NULL)) {
275 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
276 result = -EFAULT;
277 goto end;
278 }
279 memcpy(&pr->performance->control_register, obj.buffer.pointer,
280 sizeof(struct acpi_pct_register));
281
282 /*
283 * status_register
284 */
285
286 obj = pct->package.elements[1];
287
288 if ((obj.type != ACPI_TYPE_BUFFER)
289 || (obj.buffer.length < sizeof(struct acpi_pct_register))
290 || (obj.buffer.pointer == NULL)) {
291 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
292 result = -EFAULT;
293 goto end;
294 }
295
296 memcpy(&pr->performance->status_register, obj.buffer.pointer,
297 sizeof(struct acpi_pct_register));
298
299 end:
300 kfree(buffer.pointer);
301
302 return result;
303}
304
305static int acpi_processor_get_performance_states(struct acpi_processor *pr)
306{
307 int result = 0;
308 acpi_status status = AE_OK;
309 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
310 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
311 struct acpi_buffer state = { 0, NULL };
312 union acpi_object *pss = NULL;
313 int i;
314
315
316 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
317 if (ACPI_FAILURE(status)) {
318 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
319 return -ENODEV;
320 }
321
322 pss = buffer.pointer;
323 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
324 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
325 result = -EFAULT;
326 goto end;
327 }
328
329 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
330 pss->package.count));
331
332 pr->performance->state_count = pss->package.count;
333 pr->performance->states =
334 kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
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_DEBUG_PRINT((ACPI_DB_INFO, "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_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
354 result = -EFAULT;
355 kfree(pr->performance->states);
356 goto end;
357 }
358
359 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
360 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
361 i,
362 (u32) px->core_frequency,
363 (u32) px->power,
364 (u32) px->transition_latency,
365 (u32) px->bus_master_latency,
366 (u32) px->control, (u32) px->status));
367
368 /*
369 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
370 */
371 if (!px->core_frequency ||
372 ((u32)(px->core_frequency * 1000) !=
373 (px->core_frequency * 1000))) {
374 printk(KERN_ERR FW_BUG PREFIX
375 "Invalid BIOS _PSS frequency: 0x%llx MHz\n",
376 px->core_frequency);
377 result = -EFAULT;
378 kfree(pr->performance->states);
379 goto end;
380 }
381 }
382
383 end:
384 kfree(buffer.pointer);
385
386 return result;
387}
388
389static int acpi_processor_get_performance_info(struct acpi_processor *pr)
390{
391 int result = 0;
392 acpi_status status = AE_OK;
393 acpi_handle handle = NULL;
394
395 if (!pr || !pr->performance || !pr->handle)
396 return -EINVAL;
397
398 status = acpi_get_handle(pr->handle, "_PCT", &handle);
399 if (ACPI_FAILURE(status)) {
400 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){
426 if(boot_cpu_has(X86_FEATURE_EST))
427 printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
428 "frequency support\n");
429 }
430#endif
431 return result;
432}
433
434int acpi_processor_notify_smm(struct module *calling_module)
435{
436 acpi_status status;
437 static int is_done = 0;
438
439
440 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
441 return -EBUSY;
442
443 if (!try_module_get(calling_module))
444 return -EINVAL;
445
446 /* is_done is set to negative if an error occurred,
447 * and to postitive if _no_ error occurred, but SMM
448 * was already notified. This avoids double notification
449 * which might lead to unexpected results...
450 */
451 if (is_done > 0) {
452 module_put(calling_module);
453 return 0;
454 } else if (is_done < 0) {
455 module_put(calling_module);
456 return is_done;
457 }
458
459 is_done = -EIO;
460
461 /* Can't write pstate_control to smi_command if either value is zero */
462 if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
463 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
464 module_put(calling_module);
465 return 0;
466 }
467
468 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
469 "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
470 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
471
472 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
473 (u32) acpi_gbl_FADT.pstate_control, 8);
474 if (ACPI_FAILURE(status)) {
475 ACPI_EXCEPTION((AE_INFO, status,
476 "Failed to write pstate_control [0x%x] to "
477 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
478 acpi_gbl_FADT.smi_command));
479 module_put(calling_module);
480 return status;
481 }
482
483 /* Success. If there's no _PPC, we need to fear nothing, so
484 * we can allow the cpufreq driver to be rmmod'ed. */
485 is_done = 1;
486
487 if (!(acpi_processor_ppc_status & PPC_IN_USE))
488 module_put(calling_module);
489
490 return 0;
491}
492
493EXPORT_SYMBOL(acpi_processor_notify_smm);
494
495static int acpi_processor_get_psd(struct acpi_processor *pr)
496{
497 int result = 0;
498 acpi_status status = AE_OK;
499 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
500 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
501 struct acpi_buffer state = {0, NULL};
502 union acpi_object *psd = NULL;
503 struct acpi_psd_package *pdomain;
504
505 status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
506 if (ACPI_FAILURE(status)) {
507 return -ENODEV;
508 }
509
510 psd = buffer.pointer;
511 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
512 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
513 result = -EFAULT;
514 goto end;
515 }
516
517 if (psd->package.count != 1) {
518 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
519 result = -EFAULT;
520 goto end;
521 }
522
523 pdomain = &(pr->performance->domain_info);
524
525 state.length = sizeof(struct acpi_psd_package);
526 state.pointer = pdomain;
527
528 status = acpi_extract_package(&(psd->package.elements[0]),
529 &format, &state);
530 if (ACPI_FAILURE(status)) {
531 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
532 result = -EFAULT;
533 goto end;
534 }
535
536 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
537 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
538 result = -EFAULT;
539 goto end;
540 }
541
542 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
543 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
544 result = -EFAULT;
545 goto end;
546 }
547
548 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
549 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
550 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
551 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
552 result = -EFAULT;
553 goto end;
554 }
555end:
556 kfree(buffer.pointer);
557 return result;
558}
559
560int acpi_processor_preregister_performance(
561 struct acpi_processor_performance __percpu *performance)
562{
563 int count, count_target;
564 int retval = 0;
565 unsigned int i, j;
566 cpumask_var_t covered_cpus;
567 struct acpi_processor *pr;
568 struct acpi_psd_package *pdomain;
569 struct acpi_processor *match_pr;
570 struct acpi_psd_package *match_pdomain;
571
572 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
573 return -ENOMEM;
574
575 mutex_lock(&performance_mutex);
576
577 /*
578 * Check if another driver has already registered, and abort before
579 * changing pr->performance if it has. Check input data as well.
580 */
581 for_each_possible_cpu(i) {
582 pr = per_cpu(processors, i);
583 if (!pr) {
584 /* Look only at processors in ACPI namespace */
585 continue;
586 }
587
588 if (pr->performance) {
589 retval = -EBUSY;
590 goto err_out;
591 }
592
593 if (!performance || !per_cpu_ptr(performance, i)) {
594 retval = -EINVAL;
595 goto err_out;
596 }
597 }
598
599 /* Call _PSD for all CPUs */
600 for_each_possible_cpu(i) {
601 pr = per_cpu(processors, i);
602 if (!pr)
603 continue;
604
605 pr->performance = per_cpu_ptr(performance, i);
606 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
607 if (acpi_processor_get_psd(pr)) {
608 retval = -EINVAL;
609 continue;
610 }
611 }
612 if (retval)
613 goto err_ret;
614
615 /*
616 * Now that we have _PSD data from all CPUs, lets setup P-state
617 * domain info.
618 */
619 for_each_possible_cpu(i) {
620 pr = per_cpu(processors, i);
621 if (!pr)
622 continue;
623
624 if (cpumask_test_cpu(i, covered_cpus))
625 continue;
626
627 pdomain = &(pr->performance->domain_info);
628 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
629 cpumask_set_cpu(i, covered_cpus);
630 if (pdomain->num_processors <= 1)
631 continue;
632
633 /* Validate the Domain info */
634 count_target = pdomain->num_processors;
635 count = 1;
636 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
637 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
638 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
639 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
640 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
641 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
642
643 for_each_possible_cpu(j) {
644 if (i == j)
645 continue;
646
647 match_pr = per_cpu(processors, j);
648 if (!match_pr)
649 continue;
650
651 match_pdomain = &(match_pr->performance->domain_info);
652 if (match_pdomain->domain != pdomain->domain)
653 continue;
654
655 /* Here i and j are in the same domain */
656
657 if (match_pdomain->num_processors != count_target) {
658 retval = -EINVAL;
659 goto err_ret;
660 }
661
662 if (pdomain->coord_type != match_pdomain->coord_type) {
663 retval = -EINVAL;
664 goto err_ret;
665 }
666
667 cpumask_set_cpu(j, covered_cpus);
668 cpumask_set_cpu(j, pr->performance->shared_cpu_map);
669 count++;
670 }
671
672 for_each_possible_cpu(j) {
673 if (i == j)
674 continue;
675
676 match_pr = per_cpu(processors, j);
677 if (!match_pr)
678 continue;
679
680 match_pdomain = &(match_pr->performance->domain_info);
681 if (match_pdomain->domain != pdomain->domain)
682 continue;
683
684 match_pr->performance->shared_type =
685 pr->performance->shared_type;
686 cpumask_copy(match_pr->performance->shared_cpu_map,
687 pr->performance->shared_cpu_map);
688 }
689 }
690
691err_ret:
692 for_each_possible_cpu(i) {
693 pr = per_cpu(processors, i);
694 if (!pr || !pr->performance)
695 continue;
696
697 /* Assume no coordination on any error parsing domain info */
698 if (retval) {
699 cpumask_clear(pr->performance->shared_cpu_map);
700 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
701 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
702 }
703 pr->performance = NULL; /* Will be set for real in register */
704 }
705
706err_out:
707 mutex_unlock(&performance_mutex);
708 free_cpumask_var(covered_cpus);
709 return retval;
710}
711EXPORT_SYMBOL(acpi_processor_preregister_performance);
712
713int
714acpi_processor_register_performance(struct acpi_processor_performance
715 *performance, unsigned int cpu)
716{
717 struct acpi_processor *pr;
718
719 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
720 return -EINVAL;
721
722 mutex_lock(&performance_mutex);
723
724 pr = per_cpu(processors, cpu);
725 if (!pr) {
726 mutex_unlock(&performance_mutex);
727 return -ENODEV;
728 }
729
730 if (pr->performance) {
731 mutex_unlock(&performance_mutex);
732 return -EBUSY;
733 }
734
735 WARN_ON(!performance);
736
737 pr->performance = performance;
738
739 if (acpi_processor_get_performance_info(pr)) {
740 pr->performance = NULL;
741 mutex_unlock(&performance_mutex);
742 return -EIO;
743 }
744
745 mutex_unlock(&performance_mutex);
746 return 0;
747}
748
749EXPORT_SYMBOL(acpi_processor_register_performance);
750
751void
752acpi_processor_unregister_performance(struct acpi_processor_performance
753 *performance, unsigned int cpu)
754{
755 struct acpi_processor *pr;
756
757 mutex_lock(&performance_mutex);
758
759 pr = per_cpu(processors, cpu);
760 if (!pr) {
761 mutex_unlock(&performance_mutex);
762 return;
763 }
764
765 if (pr->performance)
766 kfree(pr->performance->states);
767 pr->performance = NULL;
768
769 mutex_unlock(&performance_mutex);
770
771 return;
772}
773
774EXPORT_SYMBOL(acpi_processor_unregister_performance);