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1/*
2 * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $)
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
7 * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
8 * - Added processor hotplug support
9 *
10 *
11 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or (at
16 * your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful, but
19 * WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * General Public License for more details.
22 *
23 * 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);
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);