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Linux 4.1.16
[linux/fpc-iii.git] / drivers / acpi / processor_perflib.c
blobcfc8aba72f86d02eb0c9ae53576382b6ef76f287
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 #include <linux/acpi.h>
35 #include <acpi/processor.h>
36 #ifdef CONFIG_X86
37 #include <asm/cpufeature.h>
38 #endif
39
40 #define PREFIX "ACPI: "
41
42 #define ACPI_PROCESSOR_CLASS "processor"
43 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
44 #define _COMPONENT ACPI_PROCESSOR_COMPONENT
45 ACPI_MODULE_NAME("processor_perflib");
46
47 static DEFINE_MUTEX(performance_mutex);
48
49 /*
50 * _PPC support is implemented as a CPUfreq policy notifier:
51 * This means each time a CPUfreq driver registered also with
52 * the ACPI core is asked to change the speed policy, the maximum
53 * value is adjusted so that it is within the platform limit.
54 *
55 * Also, when a new platform limit value is detected, the CPUfreq
56 * policy is adjusted accordingly.
57 */
58
59 /* ignore_ppc:
60 * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
61 * ignore _PPC
62 * 0 -> cpufreq low level drivers initialized -> consider _PPC values
63 * 1 -> ignore _PPC totally -> forced by user through boot param
64 */
65 static int ignore_ppc = -1;
66 module_param(ignore_ppc, int, 0644);
67 MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
68 "limited by BIOS, this should help");
69
70 #define PPC_REGISTERED 1
71 #define PPC_IN_USE 2
72
73 static int acpi_processor_ppc_status;
74
75 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
76 unsigned long event, void *data)
77 {
78 struct cpufreq_policy *policy = data;
79 struct acpi_processor *pr;
80 unsigned int ppc = 0;
81
82 if (event == CPUFREQ_START && ignore_ppc <= 0) {
83 ignore_ppc = 0;
84 return 0;
85 }
86
87 if (ignore_ppc)
88 return 0;
89
90 if (event != CPUFREQ_INCOMPATIBLE)
91 return 0;
92
93 mutex_lock(&performance_mutex);
94
95 pr = per_cpu(processors, policy->cpu);
96 if (!pr || !pr->performance)
97 goto out;
98
99 ppc = (unsigned int)pr->performance_platform_limit;
100
101 if (ppc >= pr->performance->state_count)
102 goto out;
103
104 cpufreq_verify_within_limits(policy, 0,
105 pr->performance->states[ppc].
106 core_frequency * 1000);
107
108 out:
109 mutex_unlock(&performance_mutex);
110
111 return 0;
112 }
113
114 static struct notifier_block acpi_ppc_notifier_block = {
115 .notifier_call = acpi_processor_ppc_notifier,
116 };
117
118 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
119 {
120 acpi_status status = 0;
121 unsigned long long ppc = 0;
122
123
124 if (!pr)
125 return -EINVAL;
126
127 /*
128 * _PPC indicates the maximum state currently supported by the platform
129 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
130 */
131 status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
132
133 if (status != AE_NOT_FOUND)
134 acpi_processor_ppc_status |= PPC_IN_USE;
135
136 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
137 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
138 return -ENODEV;
139 }
140
141 pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
142 (int)ppc, ppc ? "" : "not");
143
144 pr->performance_platform_limit = (int)ppc;
145
146 return 0;
147 }
148
149 #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
150 /*
151 * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
152 * @handle: ACPI processor handle
153 * @status: the status code of _PPC evaluation
154 * 0: success. OSPM is now using the performance state specificed.
155 * 1: failure. OSPM has not changed the number of P-states in use
156 */
157 static void acpi_processor_ppc_ost(acpi_handle handle, int status)
158 {
159 if (acpi_has_method(handle, "_OST"))
160 acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE,
161 status, NULL);
162 }
163
164 int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
165 {
166 int ret;
167
168 if (ignore_ppc) {
169 /*
170 * Only when it is notification event, the _OST object
171 * will be evaluated. Otherwise it is skipped.
172 */
173 if (event_flag)
174 acpi_processor_ppc_ost(pr->handle, 1);
175 return 0;
176 }
177
178 ret = acpi_processor_get_platform_limit(pr);
179 /*
180 * Only when it is notification event, the _OST object
181 * will be evaluated. Otherwise it is skipped.
182 */
183 if (event_flag) {
184 if (ret < 0)
185 acpi_processor_ppc_ost(pr->handle, 1);
186 else
187 acpi_processor_ppc_ost(pr->handle, 0);
188 }
189 if (ret < 0)
190 return (ret);
191 else
192 return cpufreq_update_policy(pr->id);
193 }
194
195 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
196 {
197 struct acpi_processor *pr;
198
199 pr = per_cpu(processors, cpu);
200 if (!pr || !pr->performance || !pr->performance->state_count)
201 return -ENODEV;
202 *limit = pr->performance->states[pr->performance_platform_limit].
203 core_frequency * 1000;
204 return 0;
205 }
206 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
207
208 void acpi_processor_ppc_init(void)
209 {
210 if (!cpufreq_register_notifier
211 (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
212 acpi_processor_ppc_status |= PPC_REGISTERED;
213 else
214 printk(KERN_DEBUG
215 "Warning: Processor Platform Limit not supported.\n");
216 }
217
218 void acpi_processor_ppc_exit(void)
219 {
220 if (acpi_processor_ppc_status & PPC_REGISTERED)
221 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
222 CPUFREQ_POLICY_NOTIFIER);
223
224 acpi_processor_ppc_status &= ~PPC_REGISTERED;
225 }
226
227 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
228 {
229 int result = 0;
230 acpi_status status = 0;
231 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
232 union acpi_object *pct = NULL;
233 union acpi_object obj = { 0 };
234
235
236 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
237 if (ACPI_FAILURE(status)) {
238 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
239 return -ENODEV;
240 }
241
242 pct = (union acpi_object *)buffer.pointer;
243 if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
244 || (pct->package.count != 2)) {
245 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
246 result = -EFAULT;
247 goto end;
248 }
249
250 /*
251 * control_register
252 */
253
254 obj = pct->package.elements[0];
255
256 if ((obj.type != ACPI_TYPE_BUFFER)
257 || (obj.buffer.length < sizeof(struct acpi_pct_register))
258 || (obj.buffer.pointer == NULL)) {
259 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
260 result = -EFAULT;
261 goto end;
262 }
263 memcpy(&pr->performance->control_register, obj.buffer.pointer,
264 sizeof(struct acpi_pct_register));
265
266 /*
267 * status_register
268 */
269
270 obj = pct->package.elements[1];
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 (status_register)\n");
276 result = -EFAULT;
277 goto end;
278 }
279
280 memcpy(&pr->performance->status_register, obj.buffer.pointer,
281 sizeof(struct acpi_pct_register));
282
283 end:
284 kfree(buffer.pointer);
285
286 return result;
287 }
288
289 #ifdef CONFIG_X86
290 /*
291 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
292 * in their ACPI data. Calculate the real values and fix up the _PSS data.
293 */
294 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
295 {
296 u32 hi, lo, fid, did;
297 int index = px->control & 0x00000007;
298
299 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
300 return;
301
302 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
303 || boot_cpu_data.x86 == 0x11) {
304 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
305 /*
306 * MSR C001_0064+:
307 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
308 */
309 if (!(hi & BIT(31)))
310 return;
311
312 fid = lo & 0x3f;
313 did = (lo >> 6) & 7;
314 if (boot_cpu_data.x86 == 0x10)
315 px->core_frequency = (100 * (fid + 0x10)) >> did;
316 else
317 px->core_frequency = (100 * (fid + 8)) >> did;
318 }
319 }
320 #else
321 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
322 #endif
323
324 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
325 {
326 int result = 0;
327 acpi_status status = AE_OK;
328 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
329 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
330 struct acpi_buffer state = { 0, NULL };
331 union acpi_object *pss = NULL;
332 int i;
333 int last_invalid = -1;
334
335
336 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
337 if (ACPI_FAILURE(status)) {
338 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
339 return -ENODEV;
340 }
341
342 pss = buffer.pointer;
343 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
344 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
345 result = -EFAULT;
346 goto end;
347 }
348
349 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
350 pss->package.count));
351
352 pr->performance->state_count = pss->package.count;
353 pr->performance->states =
354 kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
355 GFP_KERNEL);
356 if (!pr->performance->states) {
357 result = -ENOMEM;
358 goto end;
359 }
360
361 for (i = 0; i < pr->performance->state_count; i++) {
362
363 struct acpi_processor_px *px = &(pr->performance->states[i]);
364
365 state.length = sizeof(struct acpi_processor_px);
366 state.pointer = px;
367
368 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
369
370 status = acpi_extract_package(&(pss->package.elements[i]),
371 &format, &state);
372 if (ACPI_FAILURE(status)) {
373 ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
374 result = -EFAULT;
375 kfree(pr->performance->states);
376 goto end;
377 }
378
379 amd_fixup_frequency(px, i);
380
381 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
382 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
383 i,
384 (u32) px->core_frequency,
385 (u32) px->power,
386 (u32) px->transition_latency,
387 (u32) px->bus_master_latency,
388 (u32) px->control, (u32) px->status));
389
390 /*
391 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
392 */
393 if (!px->core_frequency ||
394 ((u32)(px->core_frequency * 1000) !=
395 (px->core_frequency * 1000))) {
396 printk(KERN_ERR FW_BUG PREFIX
397 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
398 pr->id, px->core_frequency);
399 if (last_invalid == -1)
400 last_invalid = i;
401 } else {
402 if (last_invalid != -1) {
403 /*
404 * Copy this valid entry over last_invalid entry
405 */
406 memcpy(&(pr->performance->states[last_invalid]),
407 px, sizeof(struct acpi_processor_px));
408 ++last_invalid;
409 }
410 }
411 }
412
413 if (last_invalid == 0) {
414 printk(KERN_ERR FW_BUG PREFIX
415 "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
416 result = -EFAULT;
417 kfree(pr->performance->states);
418 pr->performance->states = NULL;
419 }
420
421 if (last_invalid > 0)
422 pr->performance->state_count = last_invalid;
423
424 end:
425 kfree(buffer.pointer);
426
427 return result;
428 }
429
430 int acpi_processor_get_performance_info(struct acpi_processor *pr)
431 {
432 int result = 0;
433
434 if (!pr || !pr->performance || !pr->handle)
435 return -EINVAL;
436
437 if (!acpi_has_method(pr->handle, "_PCT")) {
438 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
439 "ACPI-based processor performance control unavailable\n"));
440 return -ENODEV;
441 }
442
443 result = acpi_processor_get_performance_control(pr);
444 if (result)
445 goto update_bios;
446
447 result = acpi_processor_get_performance_states(pr);
448 if (result)
449 goto update_bios;
450
451 /* We need to call _PPC once when cpufreq starts */
452 if (ignore_ppc != 1)
453 result = acpi_processor_get_platform_limit(pr);
454
455 return result;
456
457 /*
458 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
459 * the BIOS is older than the CPU and does not know its frequencies
460 */
461 update_bios:
462 #ifdef CONFIG_X86
463 if (acpi_has_method(pr->handle, "_PPC")) {
464 if(boot_cpu_has(X86_FEATURE_EST))
465 printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
466 "frequency support\n");
467 }
468 #endif
469 return result;
470 }
471 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
472 int acpi_processor_notify_smm(struct module *calling_module)
473 {
474 acpi_status status;
475 static int is_done = 0;
476
477
478 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
479 return -EBUSY;
480
481 if (!try_module_get(calling_module))
482 return -EINVAL;
483
484 /* is_done is set to negative if an error occurred,
485 * and to postitive if _no_ error occurred, but SMM
486 * was already notified. This avoids double notification
487 * which might lead to unexpected results...
488 */
489 if (is_done > 0) {
490 module_put(calling_module);
491 return 0;
492 } else if (is_done < 0) {
493 module_put(calling_module);
494 return is_done;
495 }
496
497 is_done = -EIO;
498
499 /* Can't write pstate_control to smi_command if either value is zero */
500 if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
501 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
502 module_put(calling_module);
503 return 0;
504 }
505
506 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
507 "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
508 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
509
510 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
511 (u32) acpi_gbl_FADT.pstate_control, 8);
512 if (ACPI_FAILURE(status)) {
513 ACPI_EXCEPTION((AE_INFO, status,
514 "Failed to write pstate_control [0x%x] to "
515 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
516 acpi_gbl_FADT.smi_command));
517 module_put(calling_module);
518 return status;
519 }
520
521 /* Success. If there's no _PPC, we need to fear nothing, so
522 * we can allow the cpufreq driver to be rmmod'ed. */
523 is_done = 1;
524
525 if (!(acpi_processor_ppc_status & PPC_IN_USE))
526 module_put(calling_module);
527
528 return 0;
529 }
530
531 EXPORT_SYMBOL(acpi_processor_notify_smm);
532
533 static int acpi_processor_get_psd(struct acpi_processor *pr)
534 {
535 int result = 0;
536 acpi_status status = AE_OK;
537 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
538 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
539 struct acpi_buffer state = {0, NULL};
540 union acpi_object *psd = NULL;
541 struct acpi_psd_package *pdomain;
542
543 status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
544 if (ACPI_FAILURE(status)) {
545 return -ENODEV;
546 }
547
548 psd = buffer.pointer;
549 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
550 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
551 result = -EFAULT;
552 goto end;
553 }
554
555 if (psd->package.count != 1) {
556 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
557 result = -EFAULT;
558 goto end;
559 }
560
561 pdomain = &(pr->performance->domain_info);
562
563 state.length = sizeof(struct acpi_psd_package);
564 state.pointer = pdomain;
565
566 status = acpi_extract_package(&(psd->package.elements[0]),
567 &format, &state);
568 if (ACPI_FAILURE(status)) {
569 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
570 result = -EFAULT;
571 goto end;
572 }
573
574 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
575 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
576 result = -EFAULT;
577 goto end;
578 }
579
580 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
581 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
582 result = -EFAULT;
583 goto end;
584 }
585
586 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
587 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
588 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
589 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
590 result = -EFAULT;
591 goto end;
592 }
593 end:
594 kfree(buffer.pointer);
595 return result;
596 }
597
598 int acpi_processor_preregister_performance(
599 struct acpi_processor_performance __percpu *performance)
600 {
601 int count_target;
602 int retval = 0;
603 unsigned int i, j;
604 cpumask_var_t covered_cpus;
605 struct acpi_processor *pr;
606 struct acpi_psd_package *pdomain;
607 struct acpi_processor *match_pr;
608 struct acpi_psd_package *match_pdomain;
609
610 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
611 return -ENOMEM;
612
613 mutex_lock(&performance_mutex);
614
615 /*
616 * Check if another driver has already registered, and abort before
617 * changing pr->performance if it has. Check input data as well.
618 */
619 for_each_possible_cpu(i) {
620 pr = per_cpu(processors, i);
621 if (!pr) {
622 /* Look only at processors in ACPI namespace */
623 continue;
624 }
625
626 if (pr->performance) {
627 retval = -EBUSY;
628 goto err_out;
629 }
630
631 if (!performance || !per_cpu_ptr(performance, i)) {
632 retval = -EINVAL;
633 goto err_out;
634 }
635 }
636
637 /* Call _PSD for all CPUs */
638 for_each_possible_cpu(i) {
639 pr = per_cpu(processors, i);
640 if (!pr)
641 continue;
642
643 pr->performance = per_cpu_ptr(performance, i);
644 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
645 if (acpi_processor_get_psd(pr)) {
646 retval = -EINVAL;
647 continue;
648 }
649 }
650 if (retval)
651 goto err_ret;
652
653 /*
654 * Now that we have _PSD data from all CPUs, lets setup P-state
655 * domain info.
656 */
657 for_each_possible_cpu(i) {
658 pr = per_cpu(processors, i);
659 if (!pr)
660 continue;
661
662 if (cpumask_test_cpu(i, covered_cpus))
663 continue;
664
665 pdomain = &(pr->performance->domain_info);
666 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
667 cpumask_set_cpu(i, covered_cpus);
668 if (pdomain->num_processors <= 1)
669 continue;
670
671 /* Validate the Domain info */
672 count_target = pdomain->num_processors;
673 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
674 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
675 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
676 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
677 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
678 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
679
680 for_each_possible_cpu(j) {
681 if (i == j)
682 continue;
683
684 match_pr = per_cpu(processors, j);
685 if (!match_pr)
686 continue;
687
688 match_pdomain = &(match_pr->performance->domain_info);
689 if (match_pdomain->domain != pdomain->domain)
690 continue;
691
692 /* Here i and j are in the same domain */
693
694 if (match_pdomain->num_processors != count_target) {
695 retval = -EINVAL;
696 goto err_ret;
697 }
698
699 if (pdomain->coord_type != match_pdomain->coord_type) {
700 retval = -EINVAL;
701 goto err_ret;
702 }
703
704 cpumask_set_cpu(j, covered_cpus);
705 cpumask_set_cpu(j, pr->performance->shared_cpu_map);
706 }
707
708 for_each_possible_cpu(j) {
709 if (i == j)
710 continue;
711
712 match_pr = per_cpu(processors, j);
713 if (!match_pr)
714 continue;
715
716 match_pdomain = &(match_pr->performance->domain_info);
717 if (match_pdomain->domain != pdomain->domain)
718 continue;
719
720 match_pr->performance->shared_type =
721 pr->performance->shared_type;
722 cpumask_copy(match_pr->performance->shared_cpu_map,
723 pr->performance->shared_cpu_map);
724 }
725 }
726
727 err_ret:
728 for_each_possible_cpu(i) {
729 pr = per_cpu(processors, i);
730 if (!pr || !pr->performance)
731 continue;
732
733 /* Assume no coordination on any error parsing domain info */
734 if (retval) {
735 cpumask_clear(pr->performance->shared_cpu_map);
736 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
737 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
738 }
739 pr->performance = NULL; /* Will be set for real in register */
740 }
741
742 err_out:
743 mutex_unlock(&performance_mutex);
744 free_cpumask_var(covered_cpus);
745 return retval;
746 }
747 EXPORT_SYMBOL(acpi_processor_preregister_performance);
748
749 int
750 acpi_processor_register_performance(struct acpi_processor_performance
751 *performance, unsigned int cpu)
752 {
753 struct acpi_processor *pr;
754
755 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
756 return -EINVAL;
757
758 mutex_lock(&performance_mutex);
759
760 pr = per_cpu(processors, cpu);
761 if (!pr) {
762 mutex_unlock(&performance_mutex);
763 return -ENODEV;
764 }
765
766 if (pr->performance) {
767 mutex_unlock(&performance_mutex);
768 return -EBUSY;
769 }
770
771 WARN_ON(!performance);
772
773 pr->performance = performance;
774
775 if (acpi_processor_get_performance_info(pr)) {
776 pr->performance = NULL;
777 mutex_unlock(&performance_mutex);
778 return -EIO;
779 }
780
781 mutex_unlock(&performance_mutex);
782 return 0;
783 }
784
785 EXPORT_SYMBOL(acpi_processor_register_performance);
786
787 void
788 acpi_processor_unregister_performance(struct acpi_processor_performance
789 *performance, unsigned int cpu)
790 {
791 struct acpi_processor *pr;
792
793 mutex_lock(&performance_mutex);
794
795 pr = per_cpu(processors, cpu);
796 if (!pr) {
797 mutex_unlock(&performance_mutex);
798 return;
799 }
800
801 if (pr->performance)
802 kfree(pr->performance->states);
803 pr->performance = NULL;
804
805 mutex_unlock(&performance_mutex);
806
807 return;
808 }
809
810 EXPORT_SYMBOL(acpi_processor_unregister_performance);
Linux with added FPC-III support