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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#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/cpufreq.h>
16#include <linux/slab.h>
17#include <linux/acpi.h>
18#include <acpi/processor.h>
19#ifdef CONFIG_X86
20#include <asm/cpufeature.h>
21#endif
22
23#define PREFIX "ACPI: "
24
25#define ACPI_PROCESSOR_CLASS "processor"
26#define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
27#define _COMPONENT ACPI_PROCESSOR_COMPONENT
28ACPI_MODULE_NAME("processor_perflib");
29
30static DEFINE_MUTEX(performance_mutex);
31
32/*
33 * _PPC support is implemented as a CPUfreq policy notifier:
34 * This means each time a CPUfreq driver registered also with
35 * the ACPI core is asked to change the speed policy, the maximum
36 * value is adjusted so that it is within the platform limit.
37 *
38 * Also, when a new platform limit value is detected, the CPUfreq
39 * policy is adjusted accordingly.
40 */
41
42/* ignore_ppc:
43 * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
44 * ignore _PPC
45 * 0 -> cpufreq low level drivers initialized -> consider _PPC values
46 * 1 -> ignore _PPC totally -> forced by user through boot param
47 */
48static int ignore_ppc = -1;
49module_param(ignore_ppc, int, 0644);
50MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
51 "limited by BIOS, this should help");
52
53static bool acpi_processor_ppc_in_use;
54
55static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
56{
57 acpi_status status = 0;
58 unsigned long long ppc = 0;
59 int ret;
60
61 if (!pr)
62 return -EINVAL;
63
64 /*
65 * _PPC indicates the maximum state currently supported by the platform
66 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
67 */
68 status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
69
70 if (status != AE_NOT_FOUND)
71 acpi_processor_ppc_in_use = true;
72
73 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
74 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
75 return -ENODEV;
76 }
77
78 pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
79 (int)ppc, ppc ? "" : "not");
80
81 pr->performance_platform_limit = (int)ppc;
82
83 if (ppc >= pr->performance->state_count ||
84 unlikely(!freq_qos_request_active(&pr->perflib_req)))
85 return 0;
86
87 ret = freq_qos_update_request(&pr->perflib_req,
88 pr->performance->states[ppc].core_frequency * 1000);
89 if (ret < 0) {
90 pr_warn("Failed to update perflib freq constraint: CPU%d (%d)\n",
91 pr->id, ret);
92 }
93
94 return 0;
95}
96
97#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
98/*
99 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
100 * @handle: ACPI processor handle
101 * @status: the status code of _PPC evaluation
102 * 0: success. OSPM is now using the performance state specificed.
103 * 1: failure. OSPM has not changed the number of P-states in use
104 */
105static void acpi_processor_ppc_ost(acpi_handle handle, int status)
106{
107 if (acpi_has_method(handle, "_OST"))
108 acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
109 status, NULL);
110}
111
112void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
113{
114 int ret;
115
116 if (ignore_ppc || !pr->performance) {
117 /*
118 * Only when it is notification event, the _OST object
119 * will be evaluated. Otherwise it is skipped.
120 */
121 if (event_flag)
122 acpi_processor_ppc_ost(pr->handle, 1);
123 return;
124 }
125
126 ret = acpi_processor_get_platform_limit(pr);
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 if (ret < 0)
133 acpi_processor_ppc_ost(pr->handle, 1);
134 else
135 acpi_processor_ppc_ost(pr->handle, 0);
136 }
137 if (ret >= 0)
138 cpufreq_update_limits(pr->id);
139}
140
141int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
142{
143 struct acpi_processor *pr;
144
145 pr = per_cpu(processors, cpu);
146 if (!pr || !pr->performance || !pr->performance->state_count)
147 return -ENODEV;
148 *limit = pr->performance->states[pr->performance_platform_limit].
149 core_frequency * 1000;
150 return 0;
151}
152EXPORT_SYMBOL(acpi_processor_get_bios_limit);
153
154void acpi_processor_ignore_ppc_init(void)
155{
156 if (ignore_ppc < 0)
157 ignore_ppc = 0;
158}
159
160void acpi_processor_ppc_init(struct cpufreq_policy *policy)
161{
162 unsigned int cpu;
163
164 for_each_cpu(cpu, policy->related_cpus) {
165 struct acpi_processor *pr = per_cpu(processors, cpu);
166 int ret;
167
168 if (!pr)
169 continue;
170
171 ret = freq_qos_add_request(&policy->constraints,
172 &pr->perflib_req,
173 FREQ_QOS_MAX, INT_MAX);
174 if (ret < 0)
175 pr_err("Failed to add freq constraint for CPU%d (%d)\n",
176 cpu, ret);
177 }
178}
179
180void acpi_processor_ppc_exit(struct cpufreq_policy *policy)
181{
182 unsigned int cpu;
183
184 for_each_cpu(cpu, policy->related_cpus) {
185 struct acpi_processor *pr = per_cpu(processors, cpu);
186
187 if (pr)
188 freq_qos_remove_request(&pr->perflib_req);
189 }
190}
191
192static int acpi_processor_get_performance_control(struct acpi_processor *pr)
193{
194 int result = 0;
195 acpi_status status = 0;
196 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
197 union acpi_object *pct = NULL;
198 union acpi_object obj = { 0 };
199
200
201 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
202 if (ACPI_FAILURE(status)) {
203 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
204 return -ENODEV;
205 }
206
207 pct = (union acpi_object *)buffer.pointer;
208 if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
209 || (pct->package.count != 2)) {
210 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
211 result = -EFAULT;
212 goto end;
213 }
214
215 /*
216 * control_register
217 */
218
219 obj = pct->package.elements[0];
220
221 if ((obj.type != ACPI_TYPE_BUFFER)
222 || (obj.buffer.length < sizeof(struct acpi_pct_register))
223 || (obj.buffer.pointer == NULL)) {
224 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
225 result = -EFAULT;
226 goto end;
227 }
228 memcpy(&pr->performance->control_register, obj.buffer.pointer,
229 sizeof(struct acpi_pct_register));
230
231 /*
232 * status_register
233 */
234
235 obj = pct->package.elements[1];
236
237 if ((obj.type != ACPI_TYPE_BUFFER)
238 || (obj.buffer.length < sizeof(struct acpi_pct_register))
239 || (obj.buffer.pointer == NULL)) {
240 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
241 result = -EFAULT;
242 goto end;
243 }
244
245 memcpy(&pr->performance->status_register, obj.buffer.pointer,
246 sizeof(struct acpi_pct_register));
247
248 end:
249 kfree(buffer.pointer);
250
251 return result;
252}
253
254#ifdef CONFIG_X86
255/*
256 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
257 * in their ACPI data. Calculate the real values and fix up the _PSS data.
258 */
259static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
260{
261 u32 hi, lo, fid, did;
262 int index = px->control & 0x00000007;
263
264 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
265 return;
266
267 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
268 || boot_cpu_data.x86 == 0x11) {
269 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
270 /*
271 * MSR C001_0064+:
272 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
273 */
274 if (!(hi & BIT(31)))
275 return;
276
277 fid = lo & 0x3f;
278 did = (lo >> 6) & 7;
279 if (boot_cpu_data.x86 == 0x10)
280 px->core_frequency = (100 * (fid + 0x10)) >> did;
281 else
282 px->core_frequency = (100 * (fid + 8)) >> did;
283 }
284}
285#else
286static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
287#endif
288
289static int acpi_processor_get_performance_states(struct acpi_processor *pr)
290{
291 int result = 0;
292 acpi_status status = AE_OK;
293 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
294 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
295 struct acpi_buffer state = { 0, NULL };
296 union acpi_object *pss = NULL;
297 int i;
298 int last_invalid = -1;
299
300
301 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
302 if (ACPI_FAILURE(status)) {
303 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
304 return -ENODEV;
305 }
306
307 pss = buffer.pointer;
308 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
309 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
310 result = -EFAULT;
311 goto end;
312 }
313
314 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
315 pss->package.count));
316
317 pr->performance->state_count = pss->package.count;
318 pr->performance->states =
319 kmalloc_array(pss->package.count,
320 sizeof(struct acpi_processor_px),
321 GFP_KERNEL);
322 if (!pr->performance->states) {
323 result = -ENOMEM;
324 goto end;
325 }
326
327 for (i = 0; i < pr->performance->state_count; i++) {
328
329 struct acpi_processor_px *px = &(pr->performance->states[i]);
330
331 state.length = sizeof(struct acpi_processor_px);
332 state.pointer = px;
333
334 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
335
336 status = acpi_extract_package(&(pss->package.elements[i]),
337 &format, &state);
338 if (ACPI_FAILURE(status)) {
339 ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
340 result = -EFAULT;
341 kfree(pr->performance->states);
342 goto end;
343 }
344
345 amd_fixup_frequency(px, i);
346
347 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
348 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
349 i,
350 (u32) px->core_frequency,
351 (u32) px->power,
352 (u32) px->transition_latency,
353 (u32) px->bus_master_latency,
354 (u32) px->control, (u32) px->status));
355
356 /*
357 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
358 */
359 if (!px->core_frequency ||
360 ((u32)(px->core_frequency * 1000) !=
361 (px->core_frequency * 1000))) {
362 printk(KERN_ERR FW_BUG PREFIX
363 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
364 pr->id, px->core_frequency);
365 if (last_invalid == -1)
366 last_invalid = i;
367 } else {
368 if (last_invalid != -1) {
369 /*
370 * Copy this valid entry over last_invalid entry
371 */
372 memcpy(&(pr->performance->states[last_invalid]),
373 px, sizeof(struct acpi_processor_px));
374 ++last_invalid;
375 }
376 }
377 }
378
379 if (last_invalid == 0) {
380 printk(KERN_ERR FW_BUG PREFIX
381 "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
382 result = -EFAULT;
383 kfree(pr->performance->states);
384 pr->performance->states = NULL;
385 }
386
387 if (last_invalid > 0)
388 pr->performance->state_count = last_invalid;
389
390 end:
391 kfree(buffer.pointer);
392
393 return result;
394}
395
396int acpi_processor_get_performance_info(struct acpi_processor *pr)
397{
398 int result = 0;
399
400 if (!pr || !pr->performance || !pr->handle)
401 return -EINVAL;
402
403 if (!acpi_has_method(pr->handle, "_PCT")) {
404 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
405 "ACPI-based processor performance control unavailable\n"));
406 return -ENODEV;
407 }
408
409 result = acpi_processor_get_performance_control(pr);
410 if (result)
411 goto update_bios;
412
413 result = acpi_processor_get_performance_states(pr);
414 if (result)
415 goto update_bios;
416
417 /* We need to call _PPC once when cpufreq starts */
418 if (ignore_ppc != 1)
419 result = acpi_processor_get_platform_limit(pr);
420
421 return result;
422
423 /*
424 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
425 * the BIOS is older than the CPU and does not know its frequencies
426 */
427 update_bios:
428#ifdef CONFIG_X86
429 if (acpi_has_method(pr->handle, "_PPC")) {
430 if(boot_cpu_has(X86_FEATURE_EST))
431 printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
432 "frequency support\n");
433 }
434#endif
435 return result;
436}
437EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
438
439int acpi_processor_pstate_control(void)
440{
441 acpi_status status;
442
443 if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
444 return 0;
445
446 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
447 "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
448 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
449
450 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
451 (u32)acpi_gbl_FADT.pstate_control, 8);
452 if (ACPI_SUCCESS(status))
453 return 1;
454
455 ACPI_EXCEPTION((AE_INFO, status,
456 "Failed to write pstate_control [0x%x] to smi_command [0x%x]",
457 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
458 return -EIO;
459}
460
461int acpi_processor_notify_smm(struct module *calling_module)
462{
463 static int is_done = 0;
464 int result;
465
466 if (!acpi_processor_cpufreq_init)
467 return -EBUSY;
468
469 if (!try_module_get(calling_module))
470 return -EINVAL;
471
472 /* is_done is set to negative if an error occurred,
473 * and to postitive if _no_ error occurred, but SMM
474 * was already notified. This avoids double notification
475 * which might lead to unexpected results...
476 */
477 if (is_done > 0) {
478 module_put(calling_module);
479 return 0;
480 } else if (is_done < 0) {
481 module_put(calling_module);
482 return is_done;
483 }
484
485 is_done = -EIO;
486
487 result = acpi_processor_pstate_control();
488 if (!result) {
489 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
490 module_put(calling_module);
491 return 0;
492 }
493 if (result < 0) {
494 module_put(calling_module);
495 return result;
496 }
497
498 /* Success. If there's no _PPC, we need to fear nothing, so
499 * we can allow the cpufreq driver to be rmmod'ed. */
500 is_done = 1;
501
502 if (!acpi_processor_ppc_in_use)
503 module_put(calling_module);
504
505 return 0;
506}
507
508EXPORT_SYMBOL(acpi_processor_notify_smm);
509
510int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)
511{
512 int result = 0;
513 acpi_status status = AE_OK;
514 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
515 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
516 struct acpi_buffer state = {0, NULL};
517 union acpi_object *psd = NULL;
518
519 status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer);
520 if (ACPI_FAILURE(status)) {
521 return -ENODEV;
522 }
523
524 psd = buffer.pointer;
525 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
526 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
527 result = -EFAULT;
528 goto end;
529 }
530
531 if (psd->package.count != 1) {
532 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
533 result = -EFAULT;
534 goto end;
535 }
536
537 state.length = sizeof(struct acpi_psd_package);
538 state.pointer = pdomain;
539
540 status = acpi_extract_package(&(psd->package.elements[0]),
541 &format, &state);
542 if (ACPI_FAILURE(status)) {
543 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
544 result = -EFAULT;
545 goto end;
546 }
547
548 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
549 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
550 result = -EFAULT;
551 goto end;
552 }
553
554 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
555 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
556 result = -EFAULT;
557 goto end;
558 }
559
560 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
561 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
562 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
563 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
564 result = -EFAULT;
565 goto end;
566 }
567end:
568 kfree(buffer.pointer);
569 return result;
570}
571EXPORT_SYMBOL(acpi_processor_get_psd);
572
573int acpi_processor_preregister_performance(
574 struct acpi_processor_performance __percpu *performance)
575{
576 int count_target;
577 int retval = 0;
578 unsigned int i, j;
579 cpumask_var_t covered_cpus;
580 struct acpi_processor *pr;
581 struct acpi_psd_package *pdomain;
582 struct acpi_processor *match_pr;
583 struct acpi_psd_package *match_pdomain;
584
585 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
586 return -ENOMEM;
587
588 mutex_lock(&performance_mutex);
589
590 /*
591 * Check if another driver has already registered, and abort before
592 * changing pr->performance if it has. Check input data as well.
593 */
594 for_each_possible_cpu(i) {
595 pr = per_cpu(processors, i);
596 if (!pr) {
597 /* Look only at processors in ACPI namespace */
598 continue;
599 }
600
601 if (pr->performance) {
602 retval = -EBUSY;
603 goto err_out;
604 }
605
606 if (!performance || !per_cpu_ptr(performance, i)) {
607 retval = -EINVAL;
608 goto err_out;
609 }
610 }
611
612 /* Call _PSD for all CPUs */
613 for_each_possible_cpu(i) {
614 pr = per_cpu(processors, i);
615 if (!pr)
616 continue;
617
618 pr->performance = per_cpu_ptr(performance, i);
619 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
620 pdomain = &(pr->performance->domain_info);
621 if (acpi_processor_get_psd(pr->handle, pdomain)) {
622 retval = -EINVAL;
623 continue;
624 }
625 }
626 if (retval)
627 goto err_ret;
628
629 /*
630 * Now that we have _PSD data from all CPUs, lets setup P-state
631 * domain info.
632 */
633 for_each_possible_cpu(i) {
634 pr = per_cpu(processors, i);
635 if (!pr)
636 continue;
637
638 if (cpumask_test_cpu(i, covered_cpus))
639 continue;
640
641 pdomain = &(pr->performance->domain_info);
642 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
643 cpumask_set_cpu(i, covered_cpus);
644 if (pdomain->num_processors <= 1)
645 continue;
646
647 /* Validate the Domain info */
648 count_target = pdomain->num_processors;
649 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
650 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
651 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
652 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
653 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
654 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
655
656 for_each_possible_cpu(j) {
657 if (i == j)
658 continue;
659
660 match_pr = per_cpu(processors, j);
661 if (!match_pr)
662 continue;
663
664 match_pdomain = &(match_pr->performance->domain_info);
665 if (match_pdomain->domain != pdomain->domain)
666 continue;
667
668 /* Here i and j are in the same domain */
669
670 if (match_pdomain->num_processors != count_target) {
671 retval = -EINVAL;
672 goto err_ret;
673 }
674
675 if (pdomain->coord_type != match_pdomain->coord_type) {
676 retval = -EINVAL;
677 goto err_ret;
678 }
679
680 cpumask_set_cpu(j, covered_cpus);
681 cpumask_set_cpu(j, pr->performance->shared_cpu_map);
682 }
683
684 for_each_possible_cpu(j) {
685 if (i == j)
686 continue;
687
688 match_pr = per_cpu(processors, j);
689 if (!match_pr)
690 continue;
691
692 match_pdomain = &(match_pr->performance->domain_info);
693 if (match_pdomain->domain != pdomain->domain)
694 continue;
695
696 match_pr->performance->shared_type =
697 pr->performance->shared_type;
698 cpumask_copy(match_pr->performance->shared_cpu_map,
699 pr->performance->shared_cpu_map);
700 }
701 }
702
703err_ret:
704 for_each_possible_cpu(i) {
705 pr = per_cpu(processors, i);
706 if (!pr || !pr->performance)
707 continue;
708
709 /* Assume no coordination on any error parsing domain info */
710 if (retval) {
711 cpumask_clear(pr->performance->shared_cpu_map);
712 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
713 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
714 }
715 pr->performance = NULL; /* Will be set for real in register */
716 }
717
718err_out:
719 mutex_unlock(&performance_mutex);
720 free_cpumask_var(covered_cpus);
721 return retval;
722}
723EXPORT_SYMBOL(acpi_processor_preregister_performance);
724
725int
726acpi_processor_register_performance(struct acpi_processor_performance
727 *performance, unsigned int cpu)
728{
729 struct acpi_processor *pr;
730
731 if (!acpi_processor_cpufreq_init)
732 return -EINVAL;
733
734 mutex_lock(&performance_mutex);
735
736 pr = per_cpu(processors, cpu);
737 if (!pr) {
738 mutex_unlock(&performance_mutex);
739 return -ENODEV;
740 }
741
742 if (pr->performance) {
743 mutex_unlock(&performance_mutex);
744 return -EBUSY;
745 }
746
747 WARN_ON(!performance);
748
749 pr->performance = performance;
750
751 if (acpi_processor_get_performance_info(pr)) {
752 pr->performance = NULL;
753 mutex_unlock(&performance_mutex);
754 return -EIO;
755 }
756
757 mutex_unlock(&performance_mutex);
758 return 0;
759}
760
761EXPORT_SYMBOL(acpi_processor_register_performance);
762
763void acpi_processor_unregister_performance(unsigned int cpu)
764{
765 struct acpi_processor *pr;
766
767 mutex_lock(&performance_mutex);
768
769 pr = per_cpu(processors, cpu);
770 if (!pr) {
771 mutex_unlock(&performance_mutex);
772 return;
773 }
774
775 if (pr->performance)
776 kfree(pr->performance->states);
777 pr->performance = NULL;
778
779 mutex_unlock(&performance_mutex);
780
781 return;
782}
783
784EXPORT_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 (ignore_ppc < 0)
79 ignore_ppc = 0;
80
81 if (ignore_ppc)
82 return 0;
83
84 if (event != CPUFREQ_ADJUST)
85 return 0;
86
87 mutex_lock(&performance_mutex);
88
89 pr = per_cpu(processors, policy->cpu);
90 if (!pr || !pr->performance)
91 goto out;
92
93 ppc = (unsigned int)pr->performance_platform_limit;
94
95 if (ppc >= pr->performance->state_count)
96 goto out;
97
98 cpufreq_verify_within_limits(policy, 0,
99 pr->performance->states[ppc].
100 core_frequency * 1000);
101
102 out:
103 mutex_unlock(&performance_mutex);
104
105 return 0;
106}
107
108static struct notifier_block acpi_ppc_notifier_block = {
109 .notifier_call = acpi_processor_ppc_notifier,
110};
111
112static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
113{
114 acpi_status status = 0;
115 unsigned long long ppc = 0;
116
117
118 if (!pr)
119 return -EINVAL;
120
121 /*
122 * _PPC indicates the maximum state currently supported by the platform
123 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
124 */
125 status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
126
127 if (status != AE_NOT_FOUND)
128 acpi_processor_ppc_status |= PPC_IN_USE;
129
130 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
131 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
132 return -ENODEV;
133 }
134
135 pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
136 (int)ppc, ppc ? "" : "not");
137
138 pr->performance_platform_limit = (int)ppc;
139
140 return 0;
141}
142
143#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
144/*
145 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
146 * @handle: ACPI processor handle
147 * @status: the status code of _PPC evaluation
148 * 0: success. OSPM is now using the performance state specificed.
149 * 1: failure. OSPM has not changed the number of P-states in use
150 */
151static void acpi_processor_ppc_ost(acpi_handle handle, int status)
152{
153 if (acpi_has_method(handle, "_OST"))
154 acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
155 status, NULL);
156}
157
158void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
159{
160 int ret;
161
162 if (ignore_ppc || !pr->performance) {
163 /*
164 * Only when it is notification event, the _OST object
165 * will be evaluated. Otherwise it is skipped.
166 */
167 if (event_flag)
168 acpi_processor_ppc_ost(pr->handle, 1);
169 return;
170 }
171
172 ret = acpi_processor_get_platform_limit(pr);
173 /*
174 * Only when it is notification event, the _OST object
175 * will be evaluated. Otherwise it is skipped.
176 */
177 if (event_flag) {
178 if (ret < 0)
179 acpi_processor_ppc_ost(pr->handle, 1);
180 else
181 acpi_processor_ppc_ost(pr->handle, 0);
182 }
183 if (ret >= 0)
184 cpufreq_update_policy(pr->id);
185}
186
187int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
188{
189 struct acpi_processor *pr;
190
191 pr = per_cpu(processors, cpu);
192 if (!pr || !pr->performance || !pr->performance->state_count)
193 return -ENODEV;
194 *limit = pr->performance->states[pr->performance_platform_limit].
195 core_frequency * 1000;
196 return 0;
197}
198EXPORT_SYMBOL(acpi_processor_get_bios_limit);
199
200void acpi_processor_ppc_init(void)
201{
202 if (!cpufreq_register_notifier
203 (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
204 acpi_processor_ppc_status |= PPC_REGISTERED;
205 else
206 printk(KERN_DEBUG
207 "Warning: Processor Platform Limit not supported.\n");
208}
209
210void acpi_processor_ppc_exit(void)
211{
212 if (acpi_processor_ppc_status & PPC_REGISTERED)
213 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
214 CPUFREQ_POLICY_NOTIFIER);
215
216 acpi_processor_ppc_status &= ~PPC_REGISTERED;
217}
218
219static int acpi_processor_get_performance_control(struct acpi_processor *pr)
220{
221 int result = 0;
222 acpi_status status = 0;
223 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
224 union acpi_object *pct = NULL;
225 union acpi_object obj = { 0 };
226
227
228 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
229 if (ACPI_FAILURE(status)) {
230 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
231 return -ENODEV;
232 }
233
234 pct = (union acpi_object *)buffer.pointer;
235 if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
236 || (pct->package.count != 2)) {
237 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
238 result = -EFAULT;
239 goto end;
240 }
241
242 /*
243 * control_register
244 */
245
246 obj = pct->package.elements[0];
247
248 if ((obj.type != ACPI_TYPE_BUFFER)
249 || (obj.buffer.length < sizeof(struct acpi_pct_register))
250 || (obj.buffer.pointer == NULL)) {
251 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
252 result = -EFAULT;
253 goto end;
254 }
255 memcpy(&pr->performance->control_register, obj.buffer.pointer,
256 sizeof(struct acpi_pct_register));
257
258 /*
259 * status_register
260 */
261
262 obj = pct->package.elements[1];
263
264 if ((obj.type != ACPI_TYPE_BUFFER)
265 || (obj.buffer.length < sizeof(struct acpi_pct_register))
266 || (obj.buffer.pointer == NULL)) {
267 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
268 result = -EFAULT;
269 goto end;
270 }
271
272 memcpy(&pr->performance->status_register, obj.buffer.pointer,
273 sizeof(struct acpi_pct_register));
274
275 end:
276 kfree(buffer.pointer);
277
278 return result;
279}
280
281#ifdef CONFIG_X86
282/*
283 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
284 * in their ACPI data. Calculate the real values and fix up the _PSS data.
285 */
286static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
287{
288 u32 hi, lo, fid, did;
289 int index = px->control & 0x00000007;
290
291 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
292 return;
293
294 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
295 || boot_cpu_data.x86 == 0x11) {
296 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
297 /*
298 * MSR C001_0064+:
299 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
300 */
301 if (!(hi & BIT(31)))
302 return;
303
304 fid = lo & 0x3f;
305 did = (lo >> 6) & 7;
306 if (boot_cpu_data.x86 == 0x10)
307 px->core_frequency = (100 * (fid + 0x10)) >> did;
308 else
309 px->core_frequency = (100 * (fid + 8)) >> did;
310 }
311}
312#else
313static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
314#endif
315
316static int acpi_processor_get_performance_states(struct acpi_processor *pr)
317{
318 int result = 0;
319 acpi_status status = AE_OK;
320 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
321 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
322 struct acpi_buffer state = { 0, NULL };
323 union acpi_object *pss = NULL;
324 int i;
325 int last_invalid = -1;
326
327
328 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
329 if (ACPI_FAILURE(status)) {
330 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
331 return -ENODEV;
332 }
333
334 pss = buffer.pointer;
335 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
336 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
337 result = -EFAULT;
338 goto end;
339 }
340
341 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
342 pss->package.count));
343
344 pr->performance->state_count = pss->package.count;
345 pr->performance->states =
346 kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
347 GFP_KERNEL);
348 if (!pr->performance->states) {
349 result = -ENOMEM;
350 goto end;
351 }
352
353 for (i = 0; i < pr->performance->state_count; i++) {
354
355 struct acpi_processor_px *px = &(pr->performance->states[i]);
356
357 state.length = sizeof(struct acpi_processor_px);
358 state.pointer = px;
359
360 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
361
362 status = acpi_extract_package(&(pss->package.elements[i]),
363 &format, &state);
364 if (ACPI_FAILURE(status)) {
365 ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
366 result = -EFAULT;
367 kfree(pr->performance->states);
368 goto end;
369 }
370
371 amd_fixup_frequency(px, i);
372
373 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
374 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
375 i,
376 (u32) px->core_frequency,
377 (u32) px->power,
378 (u32) px->transition_latency,
379 (u32) px->bus_master_latency,
380 (u32) px->control, (u32) px->status));
381
382 /*
383 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
384 */
385 if (!px->core_frequency ||
386 ((u32)(px->core_frequency * 1000) !=
387 (px->core_frequency * 1000))) {
388 printk(KERN_ERR FW_BUG PREFIX
389 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
390 pr->id, px->core_frequency);
391 if (last_invalid == -1)
392 last_invalid = i;
393 } else {
394 if (last_invalid != -1) {
395 /*
396 * Copy this valid entry over last_invalid entry
397 */
398 memcpy(&(pr->performance->states[last_invalid]),
399 px, sizeof(struct acpi_processor_px));
400 ++last_invalid;
401 }
402 }
403 }
404
405 if (last_invalid == 0) {
406 printk(KERN_ERR FW_BUG PREFIX
407 "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
408 result = -EFAULT;
409 kfree(pr->performance->states);
410 pr->performance->states = NULL;
411 }
412
413 if (last_invalid > 0)
414 pr->performance->state_count = last_invalid;
415
416 end:
417 kfree(buffer.pointer);
418
419 return result;
420}
421
422int acpi_processor_get_performance_info(struct acpi_processor *pr)
423{
424 int result = 0;
425
426 if (!pr || !pr->performance || !pr->handle)
427 return -EINVAL;
428
429 if (!acpi_has_method(pr->handle, "_PCT")) {
430 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
431 "ACPI-based processor performance control unavailable\n"));
432 return -ENODEV;
433 }
434
435 result = acpi_processor_get_performance_control(pr);
436 if (result)
437 goto update_bios;
438
439 result = acpi_processor_get_performance_states(pr);
440 if (result)
441 goto update_bios;
442
443 /* We need to call _PPC once when cpufreq starts */
444 if (ignore_ppc != 1)
445 result = acpi_processor_get_platform_limit(pr);
446
447 return result;
448
449 /*
450 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
451 * the BIOS is older than the CPU and does not know its frequencies
452 */
453 update_bios:
454#ifdef CONFIG_X86
455 if (acpi_has_method(pr->handle, "_PPC")) {
456 if(boot_cpu_has(X86_FEATURE_EST))
457 printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
458 "frequency support\n");
459 }
460#endif
461 return result;
462}
463EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
464
465int acpi_processor_pstate_control(void)
466{
467 acpi_status status;
468
469 if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
470 return 0;
471
472 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
473 "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
474 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
475
476 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
477 (u32)acpi_gbl_FADT.pstate_control, 8);
478 if (ACPI_SUCCESS(status))
479 return 1;
480
481 ACPI_EXCEPTION((AE_INFO, status,
482 "Failed to write pstate_control [0x%x] to smi_command [0x%x]",
483 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
484 return -EIO;
485}
486
487int acpi_processor_notify_smm(struct module *calling_module)
488{
489 static int is_done = 0;
490 int result;
491
492 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
493 return -EBUSY;
494
495 if (!try_module_get(calling_module))
496 return -EINVAL;
497
498 /* is_done is set to negative if an error occurred,
499 * and to postitive if _no_ error occurred, but SMM
500 * was already notified. This avoids double notification
501 * which might lead to unexpected results...
502 */
503 if (is_done > 0) {
504 module_put(calling_module);
505 return 0;
506 } else if (is_done < 0) {
507 module_put(calling_module);
508 return is_done;
509 }
510
511 is_done = -EIO;
512
513 result = acpi_processor_pstate_control();
514 if (!result) {
515 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
516 module_put(calling_module);
517 return 0;
518 }
519 if (result < 0) {
520 module_put(calling_module);
521 return result;
522 }
523
524 /* Success. If there's no _PPC, we need to fear nothing, so
525 * we can allow the cpufreq driver to be rmmod'ed. */
526 is_done = 1;
527
528 if (!(acpi_processor_ppc_status & PPC_IN_USE))
529 module_put(calling_module);
530
531 return 0;
532}
533
534EXPORT_SYMBOL(acpi_processor_notify_smm);
535
536int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain)
537{
538 int result = 0;
539 acpi_status status = AE_OK;
540 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
541 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
542 struct acpi_buffer state = {0, NULL};
543 union acpi_object *psd = NULL;
544
545 status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer);
546 if (ACPI_FAILURE(status)) {
547 return -ENODEV;
548 }
549
550 psd = buffer.pointer;
551 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
552 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
553 result = -EFAULT;
554 goto end;
555 }
556
557 if (psd->package.count != 1) {
558 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
559 result = -EFAULT;
560 goto end;
561 }
562
563 state.length = sizeof(struct acpi_psd_package);
564 state.pointer = pdomain;
565
566 status = acpi_extract_package(&(psd->package.elements[0]),
567 &format, &state);
568 if (ACPI_FAILURE(status)) {
569 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
570 result = -EFAULT;
571 goto end;
572 }
573
574 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
575 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
576 result = -EFAULT;
577 goto end;
578 }
579
580 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
581 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
582 result = -EFAULT;
583 goto end;
584 }
585
586 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
587 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
588 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
589 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
590 result = -EFAULT;
591 goto end;
592 }
593end:
594 kfree(buffer.pointer);
595 return result;
596}
597EXPORT_SYMBOL(acpi_processor_get_psd);
598
599int acpi_processor_preregister_performance(
600 struct acpi_processor_performance __percpu *performance)
601{
602 int count_target;
603 int retval = 0;
604 unsigned int i, j;
605 cpumask_var_t covered_cpus;
606 struct acpi_processor *pr;
607 struct acpi_psd_package *pdomain;
608 struct acpi_processor *match_pr;
609 struct acpi_psd_package *match_pdomain;
610
611 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
612 return -ENOMEM;
613
614 mutex_lock(&performance_mutex);
615
616 /*
617 * Check if another driver has already registered, and abort before
618 * changing pr->performance if it has. Check input data as well.
619 */
620 for_each_possible_cpu(i) {
621 pr = per_cpu(processors, i);
622 if (!pr) {
623 /* Look only at processors in ACPI namespace */
624 continue;
625 }
626
627 if (pr->performance) {
628 retval = -EBUSY;
629 goto err_out;
630 }
631
632 if (!performance || !per_cpu_ptr(performance, i)) {
633 retval = -EINVAL;
634 goto err_out;
635 }
636 }
637
638 /* Call _PSD for all CPUs */
639 for_each_possible_cpu(i) {
640 pr = per_cpu(processors, i);
641 if (!pr)
642 continue;
643
644 pr->performance = per_cpu_ptr(performance, i);
645 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
646 pdomain = &(pr->performance->domain_info);
647 if (acpi_processor_get_psd(pr->handle, pdomain)) {
648 retval = -EINVAL;
649 continue;
650 }
651 }
652 if (retval)
653 goto err_ret;
654
655 /*
656 * Now that we have _PSD data from all CPUs, lets setup P-state
657 * domain info.
658 */
659 for_each_possible_cpu(i) {
660 pr = per_cpu(processors, i);
661 if (!pr)
662 continue;
663
664 if (cpumask_test_cpu(i, covered_cpus))
665 continue;
666
667 pdomain = &(pr->performance->domain_info);
668 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
669 cpumask_set_cpu(i, covered_cpus);
670 if (pdomain->num_processors <= 1)
671 continue;
672
673 /* Validate the Domain info */
674 count_target = pdomain->num_processors;
675 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
676 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
677 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
678 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
679 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
680 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
681
682 for_each_possible_cpu(j) {
683 if (i == j)
684 continue;
685
686 match_pr = per_cpu(processors, j);
687 if (!match_pr)
688 continue;
689
690 match_pdomain = &(match_pr->performance->domain_info);
691 if (match_pdomain->domain != pdomain->domain)
692 continue;
693
694 /* Here i and j are in the same domain */
695
696 if (match_pdomain->num_processors != count_target) {
697 retval = -EINVAL;
698 goto err_ret;
699 }
700
701 if (pdomain->coord_type != match_pdomain->coord_type) {
702 retval = -EINVAL;
703 goto err_ret;
704 }
705
706 cpumask_set_cpu(j, covered_cpus);
707 cpumask_set_cpu(j, pr->performance->shared_cpu_map);
708 }
709
710 for_each_possible_cpu(j) {
711 if (i == j)
712 continue;
713
714 match_pr = per_cpu(processors, j);
715 if (!match_pr)
716 continue;
717
718 match_pdomain = &(match_pr->performance->domain_info);
719 if (match_pdomain->domain != pdomain->domain)
720 continue;
721
722 match_pr->performance->shared_type =
723 pr->performance->shared_type;
724 cpumask_copy(match_pr->performance->shared_cpu_map,
725 pr->performance->shared_cpu_map);
726 }
727 }
728
729err_ret:
730 for_each_possible_cpu(i) {
731 pr = per_cpu(processors, i);
732 if (!pr || !pr->performance)
733 continue;
734
735 /* Assume no coordination on any error parsing domain info */
736 if (retval) {
737 cpumask_clear(pr->performance->shared_cpu_map);
738 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
739 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
740 }
741 pr->performance = NULL; /* Will be set for real in register */
742 }
743
744err_out:
745 mutex_unlock(&performance_mutex);
746 free_cpumask_var(covered_cpus);
747 return retval;
748}
749EXPORT_SYMBOL(acpi_processor_preregister_performance);
750
751int
752acpi_processor_register_performance(struct acpi_processor_performance
753 *performance, unsigned int cpu)
754{
755 struct acpi_processor *pr;
756
757 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
758 return -EINVAL;
759
760 mutex_lock(&performance_mutex);
761
762 pr = per_cpu(processors, cpu);
763 if (!pr) {
764 mutex_unlock(&performance_mutex);
765 return -ENODEV;
766 }
767
768 if (pr->performance) {
769 mutex_unlock(&performance_mutex);
770 return -EBUSY;
771 }
772
773 WARN_ON(!performance);
774
775 pr->performance = performance;
776
777 if (acpi_processor_get_performance_info(pr)) {
778 pr->performance = NULL;
779 mutex_unlock(&performance_mutex);
780 return -EIO;
781 }
782
783 mutex_unlock(&performance_mutex);
784 return 0;
785}
786
787EXPORT_SYMBOL(acpi_processor_register_performance);
788
789void acpi_processor_unregister_performance(unsigned int cpu)
790{
791 struct acpi_processor *pr;
792
793 mutex_lock(&performance_mutex);
794
795 pr = per_cpu(processors, cpu);
796 if (!pr) {
797 mutex_unlock(&performance_mutex);
798 return;
799 }
800
801 if (pr->performance)
802 kfree(pr->performance->states);
803 pr->performance = NULL;
804
805 mutex_unlock(&performance_mutex);
806
807 return;
808}
809
810EXPORT_SYMBOL(acpi_processor_unregister_performance);