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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
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 s32 qos_value;
57 int index;
58 int ret;
59
60 if (!pr)
61 return -EINVAL;
62
63 /*
64 * _PPC indicates the maximum state currently supported by the platform
65 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
66 */
67 status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
68 if (status != AE_NOT_FOUND) {
69 acpi_processor_ppc_in_use = true;
70
71 if (ACPI_FAILURE(status)) {
72 acpi_evaluation_failure_warn(pr->handle, "_PPC", status);
73 return -ENODEV;
74 }
75 }
76
77 index = ppc;
78
79 if (pr->performance_platform_limit == index ||
80 ppc >= pr->performance->state_count)
81 return 0;
82
83 pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
84 index, index ? "is" : "is not");
85
86 pr->performance_platform_limit = index;
87
88 if (unlikely(!freq_qos_request_active(&pr->perflib_req)))
89 return 0;
90
91 /*
92 * If _PPC returns 0, it means that all of the available states can be
93 * used ("no limit").
94 */
95 if (index == 0)
96 qos_value = FREQ_QOS_MAX_DEFAULT_VALUE;
97 else
98 qos_value = pr->performance->states[index].core_frequency * 1000;
99
100 ret = freq_qos_update_request(&pr->perflib_req, qos_value);
101 if (ret < 0) {
102 pr_warn("Failed to update perflib freq constraint: CPU%d (%d)\n",
103 pr->id, ret);
104 }
105
106 return 0;
107}
108
109#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
110/*
111 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
112 * @handle: ACPI processor handle
113 * @status: the status code of _PPC evaluation
114 * 0: success. OSPM is now using the performance state specified.
115 * 1: failure. OSPM has not changed the number of P-states in use
116 */
117static void acpi_processor_ppc_ost(acpi_handle handle, int status)
118{
119 if (acpi_has_method(handle, "_OST"))
120 acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
121 status, NULL);
122}
123
124void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
125{
126 int ret;
127
128 if (ignore_ppc || !pr->performance) {
129 /*
130 * Only when it is notification event, the _OST object
131 * will be evaluated. Otherwise it is skipped.
132 */
133 if (event_flag)
134 acpi_processor_ppc_ost(pr->handle, 1);
135 return;
136 }
137
138 ret = acpi_processor_get_platform_limit(pr);
139 /*
140 * Only when it is notification event, the _OST object
141 * will be evaluated. Otherwise it is skipped.
142 */
143 if (event_flag) {
144 if (ret < 0)
145 acpi_processor_ppc_ost(pr->handle, 1);
146 else
147 acpi_processor_ppc_ost(pr->handle, 0);
148 }
149 if (ret >= 0)
150 cpufreq_update_limits(pr->id);
151}
152
153int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
154{
155 struct acpi_processor *pr;
156
157 pr = per_cpu(processors, cpu);
158 if (!pr || !pr->performance || !pr->performance->state_count)
159 return -ENODEV;
160
161 *limit = pr->performance->states[pr->performance_platform_limit].
162 core_frequency * 1000;
163 return 0;
164}
165EXPORT_SYMBOL(acpi_processor_get_bios_limit);
166
167void acpi_processor_ignore_ppc_init(void)
168{
169 if (ignore_ppc < 0)
170 ignore_ppc = 0;
171}
172
173void acpi_processor_ppc_init(struct cpufreq_policy *policy)
174{
175 unsigned int cpu;
176
177 for_each_cpu(cpu, policy->related_cpus) {
178 struct acpi_processor *pr = per_cpu(processors, cpu);
179 int ret;
180
181 if (!pr)
182 continue;
183
184 /*
185 * Reset performance_platform_limit in case there is a stale
186 * value in it, so as to make it match the "no limit" QoS value
187 * below.
188 */
189 pr->performance_platform_limit = 0;
190
191 ret = freq_qos_add_request(&policy->constraints,
192 &pr->perflib_req, FREQ_QOS_MAX,
193 FREQ_QOS_MAX_DEFAULT_VALUE);
194 if (ret < 0)
195 pr_err("Failed to add freq constraint for CPU%d (%d)\n",
196 cpu, ret);
197 }
198}
199
200void acpi_processor_ppc_exit(struct cpufreq_policy *policy)
201{
202 unsigned int cpu;
203
204 for_each_cpu(cpu, policy->related_cpus) {
205 struct acpi_processor *pr = per_cpu(processors, cpu);
206
207 if (pr)
208 freq_qos_remove_request(&pr->perflib_req);
209 }
210}
211
212static int acpi_processor_get_performance_control(struct acpi_processor *pr)
213{
214 int result = 0;
215 acpi_status status = 0;
216 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
217 union acpi_object *pct = NULL;
218 union acpi_object obj = { 0 };
219
220 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
221 if (ACPI_FAILURE(status)) {
222 acpi_evaluation_failure_warn(pr->handle, "_PCT", status);
223 return -ENODEV;
224 }
225
226 pct = (union acpi_object *)buffer.pointer;
227 if (!pct || pct->type != ACPI_TYPE_PACKAGE || pct->package.count != 2) {
228 pr_err("Invalid _PCT data\n");
229 result = -EFAULT;
230 goto end;
231 }
232
233 /*
234 * control_register
235 */
236
237 obj = pct->package.elements[0];
238
239 if (!obj.buffer.pointer || obj.type != ACPI_TYPE_BUFFER ||
240 obj.buffer.length < sizeof(struct acpi_pct_register)) {
241 pr_err("Invalid _PCT data (control_register)\n");
242 result = -EFAULT;
243 goto end;
244 }
245 memcpy(&pr->performance->control_register, obj.buffer.pointer,
246 sizeof(struct acpi_pct_register));
247
248 /*
249 * status_register
250 */
251
252 obj = pct->package.elements[1];
253
254 if (!obj.buffer.pointer || obj.type != ACPI_TYPE_BUFFER ||
255 obj.buffer.length < sizeof(struct acpi_pct_register)) {
256 pr_err("Invalid _PCT data (status_register)\n");
257 result = -EFAULT;
258 goto end;
259 }
260
261 memcpy(&pr->performance->status_register, obj.buffer.pointer,
262 sizeof(struct acpi_pct_register));
263
264end:
265 kfree(buffer.pointer);
266
267 return result;
268}
269
270#ifdef CONFIG_X86
271/*
272 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
273 * in their ACPI data. Calculate the real values and fix up the _PSS data.
274 */
275static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
276{
277 u32 hi, lo, fid, did;
278 int index = px->control & 0x00000007;
279
280 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
281 return;
282
283 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) ||
284 boot_cpu_data.x86 == 0x11) {
285 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
286 /*
287 * MSR C001_0064+:
288 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
289 */
290 if (!(hi & BIT(31)))
291 return;
292
293 fid = lo & 0x3f;
294 did = (lo >> 6) & 7;
295 if (boot_cpu_data.x86 == 0x10)
296 px->core_frequency = (100 * (fid + 0x10)) >> did;
297 else
298 px->core_frequency = (100 * (fid + 8)) >> did;
299 }
300}
301#else
302static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
303#endif
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 int last_invalid = -1;
315
316 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
317 if (ACPI_FAILURE(status)) {
318 acpi_evaluation_failure_warn(pr->handle, "_PSS", status);
319 return -ENODEV;
320 }
321
322 pss = buffer.pointer;
323 if (!pss || pss->type != ACPI_TYPE_PACKAGE) {
324 pr_err("Invalid _PSS data\n");
325 result = -EFAULT;
326 goto end;
327 }
328
329 acpi_handle_debug(pr->handle, "Found %d performance states\n",
330 pss->package.count);
331
332 pr->performance->state_count = pss->package.count;
333 pr->performance->states =
334 kmalloc_array(pss->package.count,
335 sizeof(struct acpi_processor_px),
336 GFP_KERNEL);
337 if (!pr->performance->states) {
338 result = -ENOMEM;
339 goto end;
340 }
341
342 for (i = 0; i < pr->performance->state_count; i++) {
343
344 struct acpi_processor_px *px = &(pr->performance->states[i]);
345
346 state.length = sizeof(struct acpi_processor_px);
347 state.pointer = px;
348
349 acpi_handle_debug(pr->handle, "Extracting state %d\n", i);
350
351 status = acpi_extract_package(&(pss->package.elements[i]),
352 &format, &state);
353 if (ACPI_FAILURE(status)) {
354 acpi_handle_warn(pr->handle, "Invalid _PSS data: %s\n",
355 acpi_format_exception(status));
356 result = -EFAULT;
357 kfree(pr->performance->states);
358 goto end;
359 }
360
361 amd_fixup_frequency(px, i);
362
363 acpi_handle_debug(pr->handle,
364 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
365 i,
366 (u32) px->core_frequency,
367 (u32) px->power,
368 (u32) px->transition_latency,
369 (u32) px->bus_master_latency,
370 (u32) px->control, (u32) px->status);
371
372 /*
373 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
374 */
375 if (!px->core_frequency ||
376 (u32)(px->core_frequency * 1000) != px->core_frequency * 1000) {
377 pr_err(FW_BUG
378 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
379 pr->id, px->core_frequency);
380 if (last_invalid == -1)
381 last_invalid = i;
382 } else {
383 if (last_invalid != -1) {
384 /*
385 * Copy this valid entry over last_invalid entry
386 */
387 memcpy(&(pr->performance->states[last_invalid]),
388 px, sizeof(struct acpi_processor_px));
389 ++last_invalid;
390 }
391 }
392 }
393
394 if (last_invalid == 0) {
395 pr_err(FW_BUG
396 "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
397 result = -EFAULT;
398 kfree(pr->performance->states);
399 pr->performance->states = NULL;
400 }
401
402 if (last_invalid > 0)
403 pr->performance->state_count = last_invalid;
404
405end:
406 kfree(buffer.pointer);
407
408 return result;
409}
410
411int acpi_processor_get_performance_info(struct acpi_processor *pr)
412{
413 int result = 0;
414
415 if (!pr || !pr->performance || !pr->handle)
416 return -EINVAL;
417
418 if (!acpi_has_method(pr->handle, "_PCT")) {
419 acpi_handle_debug(pr->handle,
420 "ACPI-based processor performance control unavailable\n");
421 return -ENODEV;
422 }
423
424 result = acpi_processor_get_performance_control(pr);
425 if (result)
426 goto update_bios;
427
428 result = acpi_processor_get_performance_states(pr);
429 if (result)
430 goto update_bios;
431
432 /* We need to call _PPC once when cpufreq starts */
433 if (ignore_ppc != 1)
434 result = acpi_processor_get_platform_limit(pr);
435
436 return result;
437
438 /*
439 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
440 * the BIOS is older than the CPU and does not know its frequencies
441 */
442 update_bios:
443#ifdef CONFIG_X86
444 if (acpi_has_method(pr->handle, "_PPC")) {
445 if(boot_cpu_has(X86_FEATURE_EST))
446 pr_warn(FW_BUG "BIOS needs update for CPU "
447 "frequency support\n");
448 }
449#endif
450 return result;
451}
452EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
453
454int acpi_processor_pstate_control(void)
455{
456 acpi_status status;
457
458 if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
459 return 0;
460
461 pr_debug("Writing pstate_control [0x%x] to smi_command [0x%x]\n",
462 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command);
463
464 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
465 (u32)acpi_gbl_FADT.pstate_control, 8);
466 if (ACPI_SUCCESS(status))
467 return 1;
468
469 pr_warn("Failed to write pstate_control [0x%x] to smi_command [0x%x]: %s\n",
470 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command,
471 acpi_format_exception(status));
472 return -EIO;
473}
474
475int acpi_processor_notify_smm(struct module *calling_module)
476{
477 static int is_done;
478 int result = 0;
479
480 if (!acpi_processor_cpufreq_init)
481 return -EBUSY;
482
483 if (!try_module_get(calling_module))
484 return -EINVAL;
485
486 /*
487 * is_done is set to negative if an error occurs and to 1 if no error
488 * occurrs, but SMM has been notified already. This avoids repeated
489 * notification which might lead to unexpected results.
490 */
491 if (is_done != 0) {
492 if (is_done < 0)
493 result = is_done;
494
495 goto out_put;
496 }
497
498 result = acpi_processor_pstate_control();
499 if (result <= 0) {
500 if (result) {
501 is_done = result;
502 } else {
503 pr_debug("No SMI port or pstate_control\n");
504 is_done = 1;
505 }
506 goto out_put;
507 }
508
509 is_done = 1;
510 /*
511 * Success. If there _PPC, unloading the cpufreq driver would be risky,
512 * so disallow it in that case.
513 */
514 if (acpi_processor_ppc_in_use)
515 return 0;
516
517out_put:
518 module_put(calling_module);
519 return result;
520}
521EXPORT_SYMBOL(acpi_processor_notify_smm);
522
523int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)
524{
525 int result = 0;
526 acpi_status status = AE_OK;
527 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
528 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
529 struct acpi_buffer state = {0, NULL};
530 union acpi_object *psd = NULL;
531
532 status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer);
533 if (ACPI_FAILURE(status)) {
534 return -ENODEV;
535 }
536
537 psd = buffer.pointer;
538 if (!psd || psd->type != ACPI_TYPE_PACKAGE) {
539 pr_err("Invalid _PSD data\n");
540 result = -EFAULT;
541 goto end;
542 }
543
544 if (psd->package.count != 1) {
545 pr_err("Invalid _PSD data\n");
546 result = -EFAULT;
547 goto end;
548 }
549
550 state.length = sizeof(struct acpi_psd_package);
551 state.pointer = pdomain;
552
553 status = acpi_extract_package(&(psd->package.elements[0]), &format, &state);
554 if (ACPI_FAILURE(status)) {
555 pr_err("Invalid _PSD data\n");
556 result = -EFAULT;
557 goto end;
558 }
559
560 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
561 pr_err("Unknown _PSD:num_entries\n");
562 result = -EFAULT;
563 goto end;
564 }
565
566 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
567 pr_err("Unknown _PSD:revision\n");
568 result = -EFAULT;
569 goto end;
570 }
571
572 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
573 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
574 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
575 pr_err("Invalid _PSD:coord_type\n");
576 result = -EFAULT;
577 goto end;
578 }
579end:
580 kfree(buffer.pointer);
581 return result;
582}
583EXPORT_SYMBOL(acpi_processor_get_psd);
584
585int acpi_processor_preregister_performance(
586 struct acpi_processor_performance __percpu *performance)
587{
588 int count_target;
589 int retval = 0;
590 unsigned int i, j;
591 cpumask_var_t covered_cpus;
592 struct acpi_processor *pr;
593 struct acpi_psd_package *pdomain;
594 struct acpi_processor *match_pr;
595 struct acpi_psd_package *match_pdomain;
596
597 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
598 return -ENOMEM;
599
600 mutex_lock(&performance_mutex);
601
602 /*
603 * Check if another driver has already registered, and abort before
604 * changing pr->performance if it has. Check input data as well.
605 */
606 for_each_possible_cpu(i) {
607 pr = per_cpu(processors, i);
608 if (!pr) {
609 /* Look only at processors in ACPI namespace */
610 continue;
611 }
612
613 if (pr->performance) {
614 retval = -EBUSY;
615 goto err_out;
616 }
617
618 if (!performance || !per_cpu_ptr(performance, i)) {
619 retval = -EINVAL;
620 goto err_out;
621 }
622 }
623
624 /* Call _PSD for all CPUs */
625 for_each_possible_cpu(i) {
626 pr = per_cpu(processors, i);
627 if (!pr)
628 continue;
629
630 pr->performance = per_cpu_ptr(performance, i);
631 pdomain = &(pr->performance->domain_info);
632 if (acpi_processor_get_psd(pr->handle, pdomain)) {
633 retval = -EINVAL;
634 continue;
635 }
636 }
637 if (retval)
638 goto err_ret;
639
640 /*
641 * Now that we have _PSD data from all CPUs, lets setup P-state
642 * domain info.
643 */
644 for_each_possible_cpu(i) {
645 pr = per_cpu(processors, i);
646 if (!pr)
647 continue;
648
649 if (cpumask_test_cpu(i, covered_cpus))
650 continue;
651
652 pdomain = &(pr->performance->domain_info);
653 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
654 cpumask_set_cpu(i, covered_cpus);
655 if (pdomain->num_processors <= 1)
656 continue;
657
658 /* Validate the Domain info */
659 count_target = pdomain->num_processors;
660 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
661 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
662 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
663 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
664 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
665 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
666
667 for_each_possible_cpu(j) {
668 if (i == j)
669 continue;
670
671 match_pr = per_cpu(processors, j);
672 if (!match_pr)
673 continue;
674
675 match_pdomain = &(match_pr->performance->domain_info);
676 if (match_pdomain->domain != pdomain->domain)
677 continue;
678
679 /* Here i and j are in the same domain */
680
681 if (match_pdomain->num_processors != count_target) {
682 retval = -EINVAL;
683 goto err_ret;
684 }
685
686 if (pdomain->coord_type != match_pdomain->coord_type) {
687 retval = -EINVAL;
688 goto err_ret;
689 }
690
691 cpumask_set_cpu(j, covered_cpus);
692 cpumask_set_cpu(j, pr->performance->shared_cpu_map);
693 }
694
695 for_each_possible_cpu(j) {
696 if (i == j)
697 continue;
698
699 match_pr = per_cpu(processors, j);
700 if (!match_pr)
701 continue;
702
703 match_pdomain = &(match_pr->performance->domain_info);
704 if (match_pdomain->domain != pdomain->domain)
705 continue;
706
707 match_pr->performance->shared_type =
708 pr->performance->shared_type;
709 cpumask_copy(match_pr->performance->shared_cpu_map,
710 pr->performance->shared_cpu_map);
711 }
712 }
713
714err_ret:
715 for_each_possible_cpu(i) {
716 pr = per_cpu(processors, i);
717 if (!pr || !pr->performance)
718 continue;
719
720 /* Assume no coordination on any error parsing domain info */
721 if (retval) {
722 cpumask_clear(pr->performance->shared_cpu_map);
723 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
724 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_NONE;
725 }
726 pr->performance = NULL; /* Will be set for real in register */
727 }
728
729err_out:
730 mutex_unlock(&performance_mutex);
731 free_cpumask_var(covered_cpus);
732 return retval;
733}
734EXPORT_SYMBOL(acpi_processor_preregister_performance);
735
736int acpi_processor_register_performance(struct acpi_processor_performance
737 *performance, unsigned int cpu)
738{
739 struct acpi_processor *pr;
740
741 if (!acpi_processor_cpufreq_init)
742 return -EINVAL;
743
744 mutex_lock(&performance_mutex);
745
746 pr = per_cpu(processors, cpu);
747 if (!pr) {
748 mutex_unlock(&performance_mutex);
749 return -ENODEV;
750 }
751
752 if (pr->performance) {
753 mutex_unlock(&performance_mutex);
754 return -EBUSY;
755 }
756
757 WARN_ON(!performance);
758
759 pr->performance = performance;
760
761 if (acpi_processor_get_performance_info(pr)) {
762 pr->performance = NULL;
763 mutex_unlock(&performance_mutex);
764 return -EIO;
765 }
766
767 mutex_unlock(&performance_mutex);
768 return 0;
769}
770EXPORT_SYMBOL(acpi_processor_register_performance);
771
772void acpi_processor_unregister_performance(unsigned int cpu)
773{
774 struct acpi_processor *pr;
775
776 mutex_lock(&performance_mutex);
777
778 pr = per_cpu(processors, cpu);
779 if (!pr)
780 goto unlock;
781
782 if (pr->performance)
783 kfree(pr->performance->states);
784
785 pr->performance = NULL;
786
787unlock:
788 mutex_unlock(&performance_mutex);
789}
790EXPORT_SYMBOL(acpi_processor_unregister_performance);
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);