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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
243/*
244 * Do a quick check if the systems looks like it should use ACPI
245 * cpufreq. We look at a _PCT method being available, but don't
246 * do a whole lot of sanity checks.
247 */
248void acpi_processor_load_module(struct acpi_processor *pr)
249{
250 static int requested;
251 acpi_status status = 0;
252 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
253
254 if (!arch_has_acpi_pdc() || requested)
255 return;
256 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
257 if (!ACPI_FAILURE(status)) {
258 printk(KERN_INFO PREFIX "Requesting acpi_cpufreq\n");
259 request_module_nowait("acpi_cpufreq");
260 requested = 1;
261 }
262 kfree(buffer.pointer);
263}
264
265static int acpi_processor_get_performance_control(struct acpi_processor *pr)
266{
267 int result = 0;
268 acpi_status status = 0;
269 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
270 union acpi_object *pct = NULL;
271 union acpi_object obj = { 0 };
272
273
274 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
275 if (ACPI_FAILURE(status)) {
276 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
277 return -ENODEV;
278 }
279
280 pct = (union acpi_object *)buffer.pointer;
281 if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
282 || (pct->package.count != 2)) {
283 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
284 result = -EFAULT;
285 goto end;
286 }
287
288 /*
289 * control_register
290 */
291
292 obj = pct->package.elements[0];
293
294 if ((obj.type != ACPI_TYPE_BUFFER)
295 || (obj.buffer.length < sizeof(struct acpi_pct_register))
296 || (obj.buffer.pointer == NULL)) {
297 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
298 result = -EFAULT;
299 goto end;
300 }
301 memcpy(&pr->performance->control_register, obj.buffer.pointer,
302 sizeof(struct acpi_pct_register));
303
304 /*
305 * status_register
306 */
307
308 obj = pct->package.elements[1];
309
310 if ((obj.type != ACPI_TYPE_BUFFER)
311 || (obj.buffer.length < sizeof(struct acpi_pct_register))
312 || (obj.buffer.pointer == NULL)) {
313 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
314 result = -EFAULT;
315 goto end;
316 }
317
318 memcpy(&pr->performance->status_register, obj.buffer.pointer,
319 sizeof(struct acpi_pct_register));
320
321 end:
322 kfree(buffer.pointer);
323
324 return result;
325}
326
327static int acpi_processor_get_performance_states(struct acpi_processor *pr)
328{
329 int result = 0;
330 acpi_status status = AE_OK;
331 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
332 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
333 struct acpi_buffer state = { 0, NULL };
334 union acpi_object *pss = NULL;
335 int i;
336 int last_invalid = -1;
337
338
339 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
340 if (ACPI_FAILURE(status)) {
341 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
342 return -ENODEV;
343 }
344
345 pss = buffer.pointer;
346 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
347 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
348 result = -EFAULT;
349 goto end;
350 }
351
352 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
353 pss->package.count));
354
355 pr->performance->state_count = pss->package.count;
356 pr->performance->states =
357 kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
358 GFP_KERNEL);
359 if (!pr->performance->states) {
360 result = -ENOMEM;
361 goto end;
362 }
363
364 for (i = 0; i < pr->performance->state_count; i++) {
365
366 struct acpi_processor_px *px = &(pr->performance->states[i]);
367
368 state.length = sizeof(struct acpi_processor_px);
369 state.pointer = px;
370
371 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
372
373 status = acpi_extract_package(&(pss->package.elements[i]),
374 &format, &state);
375 if (ACPI_FAILURE(status)) {
376 ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
377 result = -EFAULT;
378 kfree(pr->performance->states);
379 goto end;
380 }
381
382 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
383 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
384 i,
385 (u32) px->core_frequency,
386 (u32) px->power,
387 (u32) px->transition_latency,
388 (u32) px->bus_master_latency,
389 (u32) px->control, (u32) px->status));
390
391 /*
392 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
393 */
394 if (!px->core_frequency ||
395 ((u32)(px->core_frequency * 1000) !=
396 (px->core_frequency * 1000))) {
397 printk(KERN_ERR FW_BUG PREFIX
398 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
399 pr->id, px->core_frequency);
400 if (last_invalid == -1)
401 last_invalid = i;
402 } else {
403 if (last_invalid != -1) {
404 /*
405 * Copy this valid entry over last_invalid entry
406 */
407 memcpy(&(pr->performance->states[last_invalid]),
408 px, sizeof(struct acpi_processor_px));
409 ++last_invalid;
410 }
411 }
412 }
413
414 if (last_invalid == 0) {
415 printk(KERN_ERR FW_BUG PREFIX
416 "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
417 result = -EFAULT;
418 kfree(pr->performance->states);
419 pr->performance->states = NULL;
420 }
421
422 if (last_invalid > 0)
423 pr->performance->state_count = last_invalid;
424
425 end:
426 kfree(buffer.pointer);
427
428 return result;
429}
430
431static int acpi_processor_get_performance_info(struct acpi_processor *pr)
432{
433 int result = 0;
434 acpi_status status = AE_OK;
435 acpi_handle handle = NULL;
436
437 if (!pr || !pr->performance || !pr->handle)
438 return -EINVAL;
439
440 status = acpi_get_handle(pr->handle, "_PCT", &handle);
441 if (ACPI_FAILURE(status)) {
442 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
443 "ACPI-based processor performance control unavailable\n"));
444 return -ENODEV;
445 }
446
447 result = acpi_processor_get_performance_control(pr);
448 if (result)
449 goto update_bios;
450
451 result = acpi_processor_get_performance_states(pr);
452 if (result)
453 goto update_bios;
454
455 /* We need to call _PPC once when cpufreq starts */
456 if (ignore_ppc != 1)
457 result = acpi_processor_get_platform_limit(pr);
458
459 return result;
460
461 /*
462 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
463 * the BIOS is older than the CPU and does not know its frequencies
464 */
465 update_bios:
466#ifdef CONFIG_X86
467 if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){
468 if(boot_cpu_has(X86_FEATURE_EST))
469 printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
470 "frequency support\n");
471 }
472#endif
473 return result;
474}
475
476int acpi_processor_notify_smm(struct module *calling_module)
477{
478 acpi_status status;
479 static int is_done = 0;
480
481
482 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
483 return -EBUSY;
484
485 if (!try_module_get(calling_module))
486 return -EINVAL;
487
488 /* is_done is set to negative if an error occurred,
489 * and to postitive if _no_ error occurred, but SMM
490 * was already notified. This avoids double notification
491 * which might lead to unexpected results...
492 */
493 if (is_done > 0) {
494 module_put(calling_module);
495 return 0;
496 } else if (is_done < 0) {
497 module_put(calling_module);
498 return is_done;
499 }
500
501 is_done = -EIO;
502
503 /* Can't write pstate_control to smi_command if either value is zero */
504 if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
505 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
506 module_put(calling_module);
507 return 0;
508 }
509
510 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
511 "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
512 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
513
514 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
515 (u32) acpi_gbl_FADT.pstate_control, 8);
516 if (ACPI_FAILURE(status)) {
517 ACPI_EXCEPTION((AE_INFO, status,
518 "Failed to write pstate_control [0x%x] to "
519 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
520 acpi_gbl_FADT.smi_command));
521 module_put(calling_module);
522 return status;
523 }
524
525 /* Success. If there's no _PPC, we need to fear nothing, so
526 * we can allow the cpufreq driver to be rmmod'ed. */
527 is_done = 1;
528
529 if (!(acpi_processor_ppc_status & PPC_IN_USE))
530 module_put(calling_module);
531
532 return 0;
533}
534
535EXPORT_SYMBOL(acpi_processor_notify_smm);
536
537static int acpi_processor_get_psd(struct acpi_processor *pr)
538{
539 int result = 0;
540 acpi_status status = AE_OK;
541 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
542 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
543 struct acpi_buffer state = {0, NULL};
544 union acpi_object *psd = NULL;
545 struct acpi_psd_package *pdomain;
546
547 status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
548 if (ACPI_FAILURE(status)) {
549 return -ENODEV;
550 }
551
552 psd = buffer.pointer;
553 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
554 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
555 result = -EFAULT;
556 goto end;
557 }
558
559 if (psd->package.count != 1) {
560 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
561 result = -EFAULT;
562 goto end;
563 }
564
565 pdomain = &(pr->performance->domain_info);
566
567 state.length = sizeof(struct acpi_psd_package);
568 state.pointer = pdomain;
569
570 status = acpi_extract_package(&(psd->package.elements[0]),
571 &format, &state);
572 if (ACPI_FAILURE(status)) {
573 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
574 result = -EFAULT;
575 goto end;
576 }
577
578 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
579 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
580 result = -EFAULT;
581 goto end;
582 }
583
584 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
585 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
586 result = -EFAULT;
587 goto end;
588 }
589
590 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
591 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
592 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
593 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
594 result = -EFAULT;
595 goto end;
596 }
597end:
598 kfree(buffer.pointer);
599 return result;
600}
601
602int acpi_processor_preregister_performance(
603 struct acpi_processor_performance __percpu *performance)
604{
605 int count, count_target;
606 int retval = 0;
607 unsigned int i, j;
608 cpumask_var_t covered_cpus;
609 struct acpi_processor *pr;
610 struct acpi_psd_package *pdomain;
611 struct acpi_processor *match_pr;
612 struct acpi_psd_package *match_pdomain;
613
614 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
615 return -ENOMEM;
616
617 mutex_lock(&performance_mutex);
618
619 /*
620 * Check if another driver has already registered, and abort before
621 * changing pr->performance if it has. Check input data as well.
622 */
623 for_each_possible_cpu(i) {
624 pr = per_cpu(processors, i);
625 if (!pr) {
626 /* Look only at processors in ACPI namespace */
627 continue;
628 }
629
630 if (pr->performance) {
631 retval = -EBUSY;
632 goto err_out;
633 }
634
635 if (!performance || !per_cpu_ptr(performance, i)) {
636 retval = -EINVAL;
637 goto err_out;
638 }
639 }
640
641 /* Call _PSD for all CPUs */
642 for_each_possible_cpu(i) {
643 pr = per_cpu(processors, i);
644 if (!pr)
645 continue;
646
647 pr->performance = per_cpu_ptr(performance, i);
648 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
649 if (acpi_processor_get_psd(pr)) {
650 retval = -EINVAL;
651 continue;
652 }
653 }
654 if (retval)
655 goto err_ret;
656
657 /*
658 * Now that we have _PSD data from all CPUs, lets setup P-state
659 * domain info.
660 */
661 for_each_possible_cpu(i) {
662 pr = per_cpu(processors, i);
663 if (!pr)
664 continue;
665
666 if (cpumask_test_cpu(i, covered_cpus))
667 continue;
668
669 pdomain = &(pr->performance->domain_info);
670 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
671 cpumask_set_cpu(i, covered_cpus);
672 if (pdomain->num_processors <= 1)
673 continue;
674
675 /* Validate the Domain info */
676 count_target = pdomain->num_processors;
677 count = 1;
678 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
679 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
680 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
681 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
682 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
683 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
684
685 for_each_possible_cpu(j) {
686 if (i == j)
687 continue;
688
689 match_pr = per_cpu(processors, j);
690 if (!match_pr)
691 continue;
692
693 match_pdomain = &(match_pr->performance->domain_info);
694 if (match_pdomain->domain != pdomain->domain)
695 continue;
696
697 /* Here i and j are in the same domain */
698
699 if (match_pdomain->num_processors != count_target) {
700 retval = -EINVAL;
701 goto err_ret;
702 }
703
704 if (pdomain->coord_type != match_pdomain->coord_type) {
705 retval = -EINVAL;
706 goto err_ret;
707 }
708
709 cpumask_set_cpu(j, covered_cpus);
710 cpumask_set_cpu(j, pr->performance->shared_cpu_map);
711 count++;
712 }
713
714 for_each_possible_cpu(j) {
715 if (i == j)
716 continue;
717
718 match_pr = per_cpu(processors, j);
719 if (!match_pr)
720 continue;
721
722 match_pdomain = &(match_pr->performance->domain_info);
723 if (match_pdomain->domain != pdomain->domain)
724 continue;
725
726 match_pr->performance->shared_type =
727 pr->performance->shared_type;
728 cpumask_copy(match_pr->performance->shared_cpu_map,
729 pr->performance->shared_cpu_map);
730 }
731 }
732
733err_ret:
734 for_each_possible_cpu(i) {
735 pr = per_cpu(processors, i);
736 if (!pr || !pr->performance)
737 continue;
738
739 /* Assume no coordination on any error parsing domain info */
740 if (retval) {
741 cpumask_clear(pr->performance->shared_cpu_map);
742 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
743 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
744 }
745 pr->performance = NULL; /* Will be set for real in register */
746 }
747
748err_out:
749 mutex_unlock(&performance_mutex);
750 free_cpumask_var(covered_cpus);
751 return retval;
752}
753EXPORT_SYMBOL(acpi_processor_preregister_performance);
754
755int
756acpi_processor_register_performance(struct acpi_processor_performance
757 *performance, unsigned int cpu)
758{
759 struct acpi_processor *pr;
760
761 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
762 return -EINVAL;
763
764 mutex_lock(&performance_mutex);
765
766 pr = per_cpu(processors, cpu);
767 if (!pr) {
768 mutex_unlock(&performance_mutex);
769 return -ENODEV;
770 }
771
772 if (pr->performance) {
773 mutex_unlock(&performance_mutex);
774 return -EBUSY;
775 }
776
777 WARN_ON(!performance);
778
779 pr->performance = performance;
780
781 if (acpi_processor_get_performance_info(pr)) {
782 pr->performance = NULL;
783 mutex_unlock(&performance_mutex);
784 return -EIO;
785 }
786
787 mutex_unlock(&performance_mutex);
788 return 0;
789}
790
791EXPORT_SYMBOL(acpi_processor_register_performance);
792
793void
794acpi_processor_unregister_performance(struct acpi_processor_performance
795 *performance, unsigned int cpu)
796{
797 struct acpi_processor *pr;
798
799 mutex_lock(&performance_mutex);
800
801 pr = per_cpu(processors, cpu);
802 if (!pr) {
803 mutex_unlock(&performance_mutex);
804 return;
805 }
806
807 if (pr->performance)
808 kfree(pr->performance->states);
809 pr->performance = NULL;
810
811 mutex_unlock(&performance_mutex);
812
813 return;
814}
815
816EXPORT_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
160void 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;
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 cpufreq_update_policy(pr->id);
187}
188
189int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
190{
191 struct acpi_processor *pr;
192
193 pr = per_cpu(processors, cpu);
194 if (!pr || !pr->performance || !pr->performance->state_count)
195 return -ENODEV;
196 *limit = pr->performance->states[pr->performance_platform_limit].
197 core_frequency * 1000;
198 return 0;
199}
200EXPORT_SYMBOL(acpi_processor_get_bios_limit);
201
202void acpi_processor_ppc_init(void)
203{
204 if (!cpufreq_register_notifier
205 (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
206 acpi_processor_ppc_status |= PPC_REGISTERED;
207 else
208 printk(KERN_DEBUG
209 "Warning: Processor Platform Limit not supported.\n");
210}
211
212void acpi_processor_ppc_exit(void)
213{
214 if (acpi_processor_ppc_status & PPC_REGISTERED)
215 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
216 CPUFREQ_POLICY_NOTIFIER);
217
218 acpi_processor_ppc_status &= ~PPC_REGISTERED;
219}
220
221static int acpi_processor_get_performance_control(struct acpi_processor *pr)
222{
223 int result = 0;
224 acpi_status status = 0;
225 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
226 union acpi_object *pct = NULL;
227 union acpi_object obj = { 0 };
228
229
230 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
231 if (ACPI_FAILURE(status)) {
232 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
233 return -ENODEV;
234 }
235
236 pct = (union acpi_object *)buffer.pointer;
237 if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
238 || (pct->package.count != 2)) {
239 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
240 result = -EFAULT;
241 goto end;
242 }
243
244 /*
245 * control_register
246 */
247
248 obj = pct->package.elements[0];
249
250 if ((obj.type != ACPI_TYPE_BUFFER)
251 || (obj.buffer.length < sizeof(struct acpi_pct_register))
252 || (obj.buffer.pointer == NULL)) {
253 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
254 result = -EFAULT;
255 goto end;
256 }
257 memcpy(&pr->performance->control_register, obj.buffer.pointer,
258 sizeof(struct acpi_pct_register));
259
260 /*
261 * status_register
262 */
263
264 obj = pct->package.elements[1];
265
266 if ((obj.type != ACPI_TYPE_BUFFER)
267 || (obj.buffer.length < sizeof(struct acpi_pct_register))
268 || (obj.buffer.pointer == NULL)) {
269 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
270 result = -EFAULT;
271 goto end;
272 }
273
274 memcpy(&pr->performance->status_register, obj.buffer.pointer,
275 sizeof(struct acpi_pct_register));
276
277 end:
278 kfree(buffer.pointer);
279
280 return result;
281}
282
283#ifdef CONFIG_X86
284/*
285 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
286 * in their ACPI data. Calculate the real values and fix up the _PSS data.
287 */
288static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
289{
290 u32 hi, lo, fid, did;
291 int index = px->control & 0x00000007;
292
293 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
294 return;
295
296 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
297 || boot_cpu_data.x86 == 0x11) {
298 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
299 /*
300 * MSR C001_0064+:
301 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
302 */
303 if (!(hi & BIT(31)))
304 return;
305
306 fid = lo & 0x3f;
307 did = (lo >> 6) & 7;
308 if (boot_cpu_data.x86 == 0x10)
309 px->core_frequency = (100 * (fid + 0x10)) >> did;
310 else
311 px->core_frequency = (100 * (fid + 8)) >> did;
312 }
313}
314#else
315static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
316#endif
317
318static int acpi_processor_get_performance_states(struct acpi_processor *pr)
319{
320 int result = 0;
321 acpi_status status = AE_OK;
322 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
323 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
324 struct acpi_buffer state = { 0, NULL };
325 union acpi_object *pss = NULL;
326 int i;
327 int last_invalid = -1;
328
329
330 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
331 if (ACPI_FAILURE(status)) {
332 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
333 return -ENODEV;
334 }
335
336 pss = buffer.pointer;
337 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
338 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
339 result = -EFAULT;
340 goto end;
341 }
342
343 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
344 pss->package.count));
345
346 pr->performance->state_count = pss->package.count;
347 pr->performance->states =
348 kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
349 GFP_KERNEL);
350 if (!pr->performance->states) {
351 result = -ENOMEM;
352 goto end;
353 }
354
355 for (i = 0; i < pr->performance->state_count; i++) {
356
357 struct acpi_processor_px *px = &(pr->performance->states[i]);
358
359 state.length = sizeof(struct acpi_processor_px);
360 state.pointer = px;
361
362 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
363
364 status = acpi_extract_package(&(pss->package.elements[i]),
365 &format, &state);
366 if (ACPI_FAILURE(status)) {
367 ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
368 result = -EFAULT;
369 kfree(pr->performance->states);
370 goto end;
371 }
372
373 amd_fixup_frequency(px, i);
374
375 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
376 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
377 i,
378 (u32) px->core_frequency,
379 (u32) px->power,
380 (u32) px->transition_latency,
381 (u32) px->bus_master_latency,
382 (u32) px->control, (u32) px->status));
383
384 /*
385 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
386 */
387 if (!px->core_frequency ||
388 ((u32)(px->core_frequency * 1000) !=
389 (px->core_frequency * 1000))) {
390 printk(KERN_ERR FW_BUG PREFIX
391 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
392 pr->id, px->core_frequency);
393 if (last_invalid == -1)
394 last_invalid = i;
395 } else {
396 if (last_invalid != -1) {
397 /*
398 * Copy this valid entry over last_invalid entry
399 */
400 memcpy(&(pr->performance->states[last_invalid]),
401 px, sizeof(struct acpi_processor_px));
402 ++last_invalid;
403 }
404 }
405 }
406
407 if (last_invalid == 0) {
408 printk(KERN_ERR FW_BUG PREFIX
409 "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
410 result = -EFAULT;
411 kfree(pr->performance->states);
412 pr->performance->states = NULL;
413 }
414
415 if (last_invalid > 0)
416 pr->performance->state_count = last_invalid;
417
418 end:
419 kfree(buffer.pointer);
420
421 return result;
422}
423
424int acpi_processor_get_performance_info(struct acpi_processor *pr)
425{
426 int result = 0;
427
428 if (!pr || !pr->performance || !pr->handle)
429 return -EINVAL;
430
431 if (!acpi_has_method(pr->handle, "_PCT")) {
432 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
433 "ACPI-based processor performance control unavailable\n"));
434 return -ENODEV;
435 }
436
437 result = acpi_processor_get_performance_control(pr);
438 if (result)
439 goto update_bios;
440
441 result = acpi_processor_get_performance_states(pr);
442 if (result)
443 goto update_bios;
444
445 /* We need to call _PPC once when cpufreq starts */
446 if (ignore_ppc != 1)
447 result = acpi_processor_get_platform_limit(pr);
448
449 return result;
450
451 /*
452 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
453 * the BIOS is older than the CPU and does not know its frequencies
454 */
455 update_bios:
456#ifdef CONFIG_X86
457 if (acpi_has_method(pr->handle, "_PPC")) {
458 if(boot_cpu_has(X86_FEATURE_EST))
459 printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
460 "frequency support\n");
461 }
462#endif
463 return result;
464}
465EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
466
467int acpi_processor_pstate_control(void)
468{
469 acpi_status status;
470
471 if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control)
472 return 0;
473
474 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
475 "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
476 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
477
478 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
479 (u32)acpi_gbl_FADT.pstate_control, 8);
480 if (ACPI_SUCCESS(status))
481 return 1;
482
483 ACPI_EXCEPTION((AE_INFO, status,
484 "Failed to write pstate_control [0x%x] to smi_command [0x%x]",
485 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
486 return -EIO;
487}
488
489int acpi_processor_notify_smm(struct module *calling_module)
490{
491 static int is_done = 0;
492 int result;
493
494 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
495 return -EBUSY;
496
497 if (!try_module_get(calling_module))
498 return -EINVAL;
499
500 /* is_done is set to negative if an error occurred,
501 * and to postitive if _no_ error occurred, but SMM
502 * was already notified. This avoids double notification
503 * which might lead to unexpected results...
504 */
505 if (is_done > 0) {
506 module_put(calling_module);
507 return 0;
508 } else if (is_done < 0) {
509 module_put(calling_module);
510 return is_done;
511 }
512
513 is_done = -EIO;
514
515 result = acpi_processor_pstate_control();
516 if (!result) {
517 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
518 module_put(calling_module);
519 return 0;
520 }
521 if (result < 0) {
522 module_put(calling_module);
523 return result;
524 }
525
526 /* Success. If there's no _PPC, we need to fear nothing, so
527 * we can allow the cpufreq driver to be rmmod'ed. */
528 is_done = 1;
529
530 if (!(acpi_processor_ppc_status & PPC_IN_USE))
531 module_put(calling_module);
532
533 return 0;
534}
535
536EXPORT_SYMBOL(acpi_processor_notify_smm);
537
538static int acpi_processor_get_psd(struct acpi_processor *pr)
539{
540 int result = 0;
541 acpi_status status = AE_OK;
542 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
543 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
544 struct acpi_buffer state = {0, NULL};
545 union acpi_object *psd = NULL;
546 struct acpi_psd_package *pdomain;
547
548 status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
549 if (ACPI_FAILURE(status)) {
550 return -ENODEV;
551 }
552
553 psd = buffer.pointer;
554 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
555 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
556 result = -EFAULT;
557 goto end;
558 }
559
560 if (psd->package.count != 1) {
561 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
562 result = -EFAULT;
563 goto end;
564 }
565
566 pdomain = &(pr->performance->domain_info);
567
568 state.length = sizeof(struct acpi_psd_package);
569 state.pointer = pdomain;
570
571 status = acpi_extract_package(&(psd->package.elements[0]),
572 &format, &state);
573 if (ACPI_FAILURE(status)) {
574 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
575 result = -EFAULT;
576 goto end;
577 }
578
579 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
580 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
581 result = -EFAULT;
582 goto end;
583 }
584
585 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
586 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
587 result = -EFAULT;
588 goto end;
589 }
590
591 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
592 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
593 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
594 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
595 result = -EFAULT;
596 goto end;
597 }
598end:
599 kfree(buffer.pointer);
600 return result;
601}
602
603int acpi_processor_preregister_performance(
604 struct acpi_processor_performance __percpu *performance)
605{
606 int count_target;
607 int retval = 0;
608 unsigned int i, j;
609 cpumask_var_t covered_cpus;
610 struct acpi_processor *pr;
611 struct acpi_psd_package *pdomain;
612 struct acpi_processor *match_pr;
613 struct acpi_psd_package *match_pdomain;
614
615 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
616 return -ENOMEM;
617
618 mutex_lock(&performance_mutex);
619
620 /*
621 * Check if another driver has already registered, and abort before
622 * changing pr->performance if it has. Check input data as well.
623 */
624 for_each_possible_cpu(i) {
625 pr = per_cpu(processors, i);
626 if (!pr) {
627 /* Look only at processors in ACPI namespace */
628 continue;
629 }
630
631 if (pr->performance) {
632 retval = -EBUSY;
633 goto err_out;
634 }
635
636 if (!performance || !per_cpu_ptr(performance, i)) {
637 retval = -EINVAL;
638 goto err_out;
639 }
640 }
641
642 /* Call _PSD for all CPUs */
643 for_each_possible_cpu(i) {
644 pr = per_cpu(processors, i);
645 if (!pr)
646 continue;
647
648 pr->performance = per_cpu_ptr(performance, i);
649 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
650 if (acpi_processor_get_psd(pr)) {
651 retval = -EINVAL;
652 continue;
653 }
654 }
655 if (retval)
656 goto err_ret;
657
658 /*
659 * Now that we have _PSD data from all CPUs, lets setup P-state
660 * domain info.
661 */
662 for_each_possible_cpu(i) {
663 pr = per_cpu(processors, i);
664 if (!pr)
665 continue;
666
667 if (cpumask_test_cpu(i, covered_cpus))
668 continue;
669
670 pdomain = &(pr->performance->domain_info);
671 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
672 cpumask_set_cpu(i, covered_cpus);
673 if (pdomain->num_processors <= 1)
674 continue;
675
676 /* Validate the Domain info */
677 count_target = pdomain->num_processors;
678 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
679 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
680 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
681 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
682 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
683 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
684
685 for_each_possible_cpu(j) {
686 if (i == j)
687 continue;
688
689 match_pr = per_cpu(processors, j);
690 if (!match_pr)
691 continue;
692
693 match_pdomain = &(match_pr->performance->domain_info);
694 if (match_pdomain->domain != pdomain->domain)
695 continue;
696
697 /* Here i and j are in the same domain */
698
699 if (match_pdomain->num_processors != count_target) {
700 retval = -EINVAL;
701 goto err_ret;
702 }
703
704 if (pdomain->coord_type != match_pdomain->coord_type) {
705 retval = -EINVAL;
706 goto err_ret;
707 }
708
709 cpumask_set_cpu(j, covered_cpus);
710 cpumask_set_cpu(j, pr->performance->shared_cpu_map);
711 }
712
713 for_each_possible_cpu(j) {
714 if (i == j)
715 continue;
716
717 match_pr = per_cpu(processors, j);
718 if (!match_pr)
719 continue;
720
721 match_pdomain = &(match_pr->performance->domain_info);
722 if (match_pdomain->domain != pdomain->domain)
723 continue;
724
725 match_pr->performance->shared_type =
726 pr->performance->shared_type;
727 cpumask_copy(match_pr->performance->shared_cpu_map,
728 pr->performance->shared_cpu_map);
729 }
730 }
731
732err_ret:
733 for_each_possible_cpu(i) {
734 pr = per_cpu(processors, i);
735 if (!pr || !pr->performance)
736 continue;
737
738 /* Assume no coordination on any error parsing domain info */
739 if (retval) {
740 cpumask_clear(pr->performance->shared_cpu_map);
741 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
742 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
743 }
744 pr->performance = NULL; /* Will be set for real in register */
745 }
746
747err_out:
748 mutex_unlock(&performance_mutex);
749 free_cpumask_var(covered_cpus);
750 return retval;
751}
752EXPORT_SYMBOL(acpi_processor_preregister_performance);
753
754int
755acpi_processor_register_performance(struct acpi_processor_performance
756 *performance, unsigned int cpu)
757{
758 struct acpi_processor *pr;
759
760 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
761 return -EINVAL;
762
763 mutex_lock(&performance_mutex);
764
765 pr = per_cpu(processors, cpu);
766 if (!pr) {
767 mutex_unlock(&performance_mutex);
768 return -ENODEV;
769 }
770
771 if (pr->performance) {
772 mutex_unlock(&performance_mutex);
773 return -EBUSY;
774 }
775
776 WARN_ON(!performance);
777
778 pr->performance = performance;
779
780 if (acpi_processor_get_performance_info(pr)) {
781 pr->performance = NULL;
782 mutex_unlock(&performance_mutex);
783 return -EIO;
784 }
785
786 mutex_unlock(&performance_mutex);
787 return 0;
788}
789
790EXPORT_SYMBOL(acpi_processor_register_performance);
791
792void acpi_processor_unregister_performance(unsigned int cpu)
793{
794 struct acpi_processor *pr;
795
796 mutex_lock(&performance_mutex);
797
798 pr = per_cpu(processors, cpu);
799 if (!pr) {
800 mutex_unlock(&performance_mutex);
801 return;
802 }
803
804 if (pr->performance)
805 kfree(pr->performance->states);
806 pr->performance = NULL;
807
808 mutex_unlock(&performance_mutex);
809
810 return;
811}
812
813EXPORT_SYMBOL(acpi_processor_unregister_performance);