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ipc: optimize semget/shmget/msgget for lots of keys
[linux/fpc-iii.git] / drivers / acpi / processor_perflib.c
blob18b72eec350764813dcde187cdd665e3d21ba191
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
41 ACPI_MODULE_NAME("processor_perflib");
42
43 static 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 */
61 static int ignore_ppc = -1;
62 module_param(ignore_ppc, int, 0644);
63 MODULE_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
69 static int acpi_processor_ppc_status;
70
71 static 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
108 static struct notifier_block acpi_ppc_notifier_block = {
109 .notifier_call = acpi_processor_ppc_notifier,
110 };
111
112 static 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 */
151 static 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
158 void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
159 {
160 int ret;
161
162 if (ignore_ppc) {
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
187 int 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 }
198 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
199
200 void 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
210 void 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
219 static 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 */
286 static 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
313 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
314 #endif
315
316 static 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
422 int 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 }
463 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
464
465 int 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
487 int 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
534 EXPORT_SYMBOL(acpi_processor_notify_smm);
535
536 static int acpi_processor_get_psd(struct acpi_processor *pr)
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 struct acpi_psd_package *pdomain;
545
546 status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
547 if (ACPI_FAILURE(status)) {
548 return -ENODEV;
549 }
550
551 psd = buffer.pointer;
552 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
553 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
554 result = -EFAULT;
555 goto end;
556 }
557
558 if (psd->package.count != 1) {
559 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
560 result = -EFAULT;
561 goto end;
562 }
563
564 pdomain = &(pr->performance->domain_info);
565
566 state.length = sizeof(struct acpi_psd_package);
567 state.pointer = pdomain;
568
569 status = acpi_extract_package(&(psd->package.elements[0]),
570 &format, &state);
571 if (ACPI_FAILURE(status)) {
572 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
573 result = -EFAULT;
574 goto end;
575 }
576
577 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
578 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
579 result = -EFAULT;
580 goto end;
581 }
582
583 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
584 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
585 result = -EFAULT;
586 goto end;
587 }
588
589 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
590 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
591 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
592 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
593 result = -EFAULT;
594 goto end;
595 }
596 end:
597 kfree(buffer.pointer);
598 return result;
599 }
600
601 int acpi_processor_preregister_performance(
602 struct acpi_processor_performance __percpu *performance)
603 {
604 int count_target;
605 int retval = 0;
606 unsigned int i, j;
607 cpumask_var_t covered_cpus;
608 struct acpi_processor *pr;
609 struct acpi_psd_package *pdomain;
610 struct acpi_processor *match_pr;
611 struct acpi_psd_package *match_pdomain;
612
613 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
614 return -ENOMEM;
615
616 mutex_lock(&performance_mutex);
617
618 /*
619 * Check if another driver has already registered, and abort before
620 * changing pr->performance if it has. Check input data as well.
621 */
622 for_each_possible_cpu(i) {
623 pr = per_cpu(processors, i);
624 if (!pr) {
625 /* Look only at processors in ACPI namespace */
626 continue;
627 }
628
629 if (pr->performance) {
630 retval = -EBUSY;
631 goto err_out;
632 }
633
634 if (!performance || !per_cpu_ptr(performance, i)) {
635 retval = -EINVAL;
636 goto err_out;
637 }
638 }
639
640 /* Call _PSD for all CPUs */
641 for_each_possible_cpu(i) {
642 pr = per_cpu(processors, i);
643 if (!pr)
644 continue;
645
646 pr->performance = per_cpu_ptr(performance, i);
647 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
648 if (acpi_processor_get_psd(pr)) {
649 retval = -EINVAL;
650 continue;
651 }
652 }
653 if (retval)
654 goto err_ret;
655
656 /*
657 * Now that we have _PSD data from all CPUs, lets setup P-state
658 * domain info.
659 */
660 for_each_possible_cpu(i) {
661 pr = per_cpu(processors, i);
662 if (!pr)
663 continue;
664
665 if (cpumask_test_cpu(i, covered_cpus))
666 continue;
667
668 pdomain = &(pr->performance->domain_info);
669 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
670 cpumask_set_cpu(i, covered_cpus);
671 if (pdomain->num_processors <= 1)
672 continue;
673
674 /* Validate the Domain info */
675 count_target = pdomain->num_processors;
676 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
677 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
678 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
679 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
680 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
681 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
682
683 for_each_possible_cpu(j) {
684 if (i == j)
685 continue;
686
687 match_pr = per_cpu(processors, j);
688 if (!match_pr)
689 continue;
690
691 match_pdomain = &(match_pr->performance->domain_info);
692 if (match_pdomain->domain != pdomain->domain)
693 continue;
694
695 /* Here i and j are in the same domain */
696
697 if (match_pdomain->num_processors != count_target) {
698 retval = -EINVAL;
699 goto err_ret;
700 }
701
702 if (pdomain->coord_type != match_pdomain->coord_type) {
703 retval = -EINVAL;
704 goto err_ret;
705 }
706
707 cpumask_set_cpu(j, covered_cpus);
708 cpumask_set_cpu(j, pr->performance->shared_cpu_map);
709 }
710
711 for_each_possible_cpu(j) {
712 if (i == j)
713 continue;
714
715 match_pr = per_cpu(processors, j);
716 if (!match_pr)
717 continue;
718
719 match_pdomain = &(match_pr->performance->domain_info);
720 if (match_pdomain->domain != pdomain->domain)
721 continue;
722
723 match_pr->performance->shared_type =
724 pr->performance->shared_type;
725 cpumask_copy(match_pr->performance->shared_cpu_map,
726 pr->performance->shared_cpu_map);
727 }
728 }
729
730 err_ret:
731 for_each_possible_cpu(i) {
732 pr = per_cpu(processors, i);
733 if (!pr || !pr->performance)
734 continue;
735
736 /* Assume no coordination on any error parsing domain info */
737 if (retval) {
738 cpumask_clear(pr->performance->shared_cpu_map);
739 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
740 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
741 }
742 pr->performance = NULL; /* Will be set for real in register */
743 }
744
745 err_out:
746 mutex_unlock(&performance_mutex);
747 free_cpumask_var(covered_cpus);
748 return retval;
749 }
750 EXPORT_SYMBOL(acpi_processor_preregister_performance);
751
752 int
753 acpi_processor_register_performance(struct acpi_processor_performance
754 *performance, unsigned int cpu)
755 {
756 struct acpi_processor *pr;
757
758 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
759 return -EINVAL;
760
761 mutex_lock(&performance_mutex);
762
763 pr = per_cpu(processors, cpu);
764 if (!pr) {
765 mutex_unlock(&performance_mutex);
766 return -ENODEV;
767 }
768
769 if (pr->performance) {
770 mutex_unlock(&performance_mutex);
771 return -EBUSY;
772 }
773
774 WARN_ON(!performance);
775
776 pr->performance = performance;
777
778 if (acpi_processor_get_performance_info(pr)) {
779 pr->performance = NULL;
780 mutex_unlock(&performance_mutex);
781 return -EIO;
782 }
783
784 mutex_unlock(&performance_mutex);
785 return 0;
786 }
787
788 EXPORT_SYMBOL(acpi_processor_register_performance);
789
790 void acpi_processor_unregister_performance(unsigned int cpu)
791 {
792 struct acpi_processor *pr;
793
794 mutex_lock(&performance_mutex);
795
796 pr = per_cpu(processors, cpu);
797 if (!pr) {
798 mutex_unlock(&performance_mutex);
799 return;
800 }
801
802 if (pr->performance)
803 kfree(pr->performance->states);
804 pr->performance = NULL;
805
806 mutex_unlock(&performance_mutex);
807
808 return;
809 }
810
811 EXPORT_SYMBOL(acpi_processor_unregister_performance);
Linux with added FPC-III support