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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[linux-2.6.git] / drivers / acpi / processor_perflib.c
blob60a7c28fc1674cc21bc38802fed869dc7daf0608
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
48 ACPI_MODULE_NAME("processor_perflib");
49
50 static 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 */
68 static int ignore_ppc = -1;
69 module_param(ignore_ppc, int, 0644);
70 MODULE_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
76 static int acpi_processor_ppc_status;
77
78 static 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
117 static struct notifier_block acpi_ppc_notifier_block = {
118 .notifier_call = acpi_processor_ppc_notifier,
119 };
120
121 static 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 */
160 static 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
168 if (acpi_has_method(handle, "_OST")) {
169 params[0].integer.value = ACPI_PROCESSOR_NOTIFY_PERFORMANCE;
170 params[1].integer.value = status;
171 acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
172 }
173 }
174
175 int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
176 {
177 int ret;
178
179 if (ignore_ppc) {
180 /*
181 * Only when it is notification event, the _OST object
182 * will be evaluated. Otherwise it is skipped.
183 */
184 if (event_flag)
185 acpi_processor_ppc_ost(pr->handle, 1);
186 return 0;
187 }
188
189 ret = acpi_processor_get_platform_limit(pr);
190 /*
191 * Only when it is notification event, the _OST object
192 * will be evaluated. Otherwise it is skipped.
193 */
194 if (event_flag) {
195 if (ret < 0)
196 acpi_processor_ppc_ost(pr->handle, 1);
197 else
198 acpi_processor_ppc_ost(pr->handle, 0);
199 }
200 if (ret < 0)
201 return (ret);
202 else
203 return cpufreq_update_policy(pr->id);
204 }
205
206 int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
207 {
208 struct acpi_processor *pr;
209
210 pr = per_cpu(processors, cpu);
211 if (!pr || !pr->performance || !pr->performance->state_count)
212 return -ENODEV;
213 *limit = pr->performance->states[pr->performance_platform_limit].
214 core_frequency * 1000;
215 return 0;
216 }
217 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
218
219 void acpi_processor_ppc_init(void)
220 {
221 if (!cpufreq_register_notifier
222 (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
223 acpi_processor_ppc_status |= PPC_REGISTERED;
224 else
225 printk(KERN_DEBUG
226 "Warning: Processor Platform Limit not supported.\n");
227 }
228
229 void acpi_processor_ppc_exit(void)
230 {
231 if (acpi_processor_ppc_status & PPC_REGISTERED)
232 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
233 CPUFREQ_POLICY_NOTIFIER);
234
235 acpi_processor_ppc_status &= ~PPC_REGISTERED;
236 }
237
238 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
239 {
240 int result = 0;
241 acpi_status status = 0;
242 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
243 union acpi_object *pct = NULL;
244 union acpi_object obj = { 0 };
245
246
247 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
248 if (ACPI_FAILURE(status)) {
249 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
250 return -ENODEV;
251 }
252
253 pct = (union acpi_object *)buffer.pointer;
254 if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
255 || (pct->package.count != 2)) {
256 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
257 result = -EFAULT;
258 goto end;
259 }
260
261 /*
262 * control_register
263 */
264
265 obj = pct->package.elements[0];
266
267 if ((obj.type != ACPI_TYPE_BUFFER)
268 || (obj.buffer.length < sizeof(struct acpi_pct_register))
269 || (obj.buffer.pointer == NULL)) {
270 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
271 result = -EFAULT;
272 goto end;
273 }
274 memcpy(&pr->performance->control_register, obj.buffer.pointer,
275 sizeof(struct acpi_pct_register));
276
277 /*
278 * status_register
279 */
280
281 obj = pct->package.elements[1];
282
283 if ((obj.type != ACPI_TYPE_BUFFER)
284 || (obj.buffer.length < sizeof(struct acpi_pct_register))
285 || (obj.buffer.pointer == NULL)) {
286 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
287 result = -EFAULT;
288 goto end;
289 }
290
291 memcpy(&pr->performance->status_register, obj.buffer.pointer,
292 sizeof(struct acpi_pct_register));
293
294 end:
295 kfree(buffer.pointer);
296
297 return result;
298 }
299
300 #ifdef CONFIG_X86
301 /*
302 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
303 * in their ACPI data. Calculate the real values and fix up the _PSS data.
304 */
305 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
306 {
307 u32 hi, lo, fid, did;
308 int index = px->control & 0x00000007;
309
310 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
311 return;
312
313 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
314 || boot_cpu_data.x86 == 0x11) {
315 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
316 /*
317 * MSR C001_0064+:
318 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
319 */
320 if (!(hi & BIT(31)))
321 return;
322
323 fid = lo & 0x3f;
324 did = (lo >> 6) & 7;
325 if (boot_cpu_data.x86 == 0x10)
326 px->core_frequency = (100 * (fid + 0x10)) >> did;
327 else
328 px->core_frequency = (100 * (fid + 8)) >> did;
329 }
330 }
331 #else
332 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
333 #endif
334
335 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
336 {
337 int result = 0;
338 acpi_status status = AE_OK;
339 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
340 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
341 struct acpi_buffer state = { 0, NULL };
342 union acpi_object *pss = NULL;
343 int i;
344 int last_invalid = -1;
345
346
347 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
348 if (ACPI_FAILURE(status)) {
349 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
350 return -ENODEV;
351 }
352
353 pss = buffer.pointer;
354 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
355 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
356 result = -EFAULT;
357 goto end;
358 }
359
360 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
361 pss->package.count));
362
363 pr->performance->state_count = pss->package.count;
364 pr->performance->states =
365 kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
366 GFP_KERNEL);
367 if (!pr->performance->states) {
368 result = -ENOMEM;
369 goto end;
370 }
371
372 for (i = 0; i < pr->performance->state_count; i++) {
373
374 struct acpi_processor_px *px = &(pr->performance->states[i]);
375
376 state.length = sizeof(struct acpi_processor_px);
377 state.pointer = px;
378
379 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
380
381 status = acpi_extract_package(&(pss->package.elements[i]),
382 &format, &state);
383 if (ACPI_FAILURE(status)) {
384 ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
385 result = -EFAULT;
386 kfree(pr->performance->states);
387 goto end;
388 }
389
390 amd_fixup_frequency(px, i);
391
392 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
393 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
394 i,
395 (u32) px->core_frequency,
396 (u32) px->power,
397 (u32) px->transition_latency,
398 (u32) px->bus_master_latency,
399 (u32) px->control, (u32) px->status));
400
401 /*
402 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
403 */
404 if (!px->core_frequency ||
405 ((u32)(px->core_frequency * 1000) !=
406 (px->core_frequency * 1000))) {
407 printk(KERN_ERR FW_BUG PREFIX
408 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
409 pr->id, px->core_frequency);
410 if (last_invalid == -1)
411 last_invalid = i;
412 } else {
413 if (last_invalid != -1) {
414 /*
415 * Copy this valid entry over last_invalid entry
416 */
417 memcpy(&(pr->performance->states[last_invalid]),
418 px, sizeof(struct acpi_processor_px));
419 ++last_invalid;
420 }
421 }
422 }
423
424 if (last_invalid == 0) {
425 printk(KERN_ERR FW_BUG PREFIX
426 "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
427 result = -EFAULT;
428 kfree(pr->performance->states);
429 pr->performance->states = NULL;
430 }
431
432 if (last_invalid > 0)
433 pr->performance->state_count = last_invalid;
434
435 end:
436 kfree(buffer.pointer);
437
438 return result;
439 }
440
441 int acpi_processor_get_performance_info(struct acpi_processor *pr)
442 {
443 int result = 0;
444
445 if (!pr || !pr->performance || !pr->handle)
446 return -EINVAL;
447
448 if (!acpi_has_method(pr->handle, "_PCT")) {
449 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
450 "ACPI-based processor performance control unavailable\n"));
451 return -ENODEV;
452 }
453
454 result = acpi_processor_get_performance_control(pr);
455 if (result)
456 goto update_bios;
457
458 result = acpi_processor_get_performance_states(pr);
459 if (result)
460 goto update_bios;
461
462 /* We need to call _PPC once when cpufreq starts */
463 if (ignore_ppc != 1)
464 result = acpi_processor_get_platform_limit(pr);
465
466 return result;
467
468 /*
469 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
470 * the BIOS is older than the CPU and does not know its frequencies
471 */
472 update_bios:
473 #ifdef CONFIG_X86
474 if (acpi_has_method(pr->handle, "_PPC")) {
475 if(boot_cpu_has(X86_FEATURE_EST))
476 printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
477 "frequency support\n");
478 }
479 #endif
480 return result;
481 }
482 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
483 int acpi_processor_notify_smm(struct module *calling_module)
484 {
485 acpi_status status;
486 static int is_done = 0;
487
488
489 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
490 return -EBUSY;
491
492 if (!try_module_get(calling_module))
493 return -EINVAL;
494
495 /* is_done is set to negative if an error occurred,
496 * and to postitive if _no_ error occurred, but SMM
497 * was already notified. This avoids double notification
498 * which might lead to unexpected results...
499 */
500 if (is_done > 0) {
501 module_put(calling_module);
502 return 0;
503 } else if (is_done < 0) {
504 module_put(calling_module);
505 return is_done;
506 }
507
508 is_done = -EIO;
509
510 /* Can't write pstate_control to smi_command if either value is zero */
511 if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
512 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
513 module_put(calling_module);
514 return 0;
515 }
516
517 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
518 "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
519 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
520
521 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
522 (u32) acpi_gbl_FADT.pstate_control, 8);
523 if (ACPI_FAILURE(status)) {
524 ACPI_EXCEPTION((AE_INFO, status,
525 "Failed to write pstate_control [0x%x] to "
526 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
527 acpi_gbl_FADT.smi_command));
528 module_put(calling_module);
529 return status;
530 }
531
532 /* Success. If there's no _PPC, we need to fear nothing, so
533 * we can allow the cpufreq driver to be rmmod'ed. */
534 is_done = 1;
535
536 if (!(acpi_processor_ppc_status & PPC_IN_USE))
537 module_put(calling_module);
538
539 return 0;
540 }
541
542 EXPORT_SYMBOL(acpi_processor_notify_smm);
543
544 static int acpi_processor_get_psd(struct acpi_processor *pr)
545 {
546 int result = 0;
547 acpi_status status = AE_OK;
548 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
549 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
550 struct acpi_buffer state = {0, NULL};
551 union acpi_object *psd = NULL;
552 struct acpi_psd_package *pdomain;
553
554 status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
555 if (ACPI_FAILURE(status)) {
556 return -ENODEV;
557 }
558
559 psd = buffer.pointer;
560 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
561 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
562 result = -EFAULT;
563 goto end;
564 }
565
566 if (psd->package.count != 1) {
567 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
568 result = -EFAULT;
569 goto end;
570 }
571
572 pdomain = &(pr->performance->domain_info);
573
574 state.length = sizeof(struct acpi_psd_package);
575 state.pointer = pdomain;
576
577 status = acpi_extract_package(&(psd->package.elements[0]),
578 &format, &state);
579 if (ACPI_FAILURE(status)) {
580 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
581 result = -EFAULT;
582 goto end;
583 }
584
585 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
586 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
587 result = -EFAULT;
588 goto end;
589 }
590
591 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
592 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
593 result = -EFAULT;
594 goto end;
595 }
596
597 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
598 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
599 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
600 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
601 result = -EFAULT;
602 goto end;
603 }
604 end:
605 kfree(buffer.pointer);
606 return result;
607 }
608
609 int acpi_processor_preregister_performance(
610 struct acpi_processor_performance __percpu *performance)
611 {
612 int count_target;
613 int retval = 0;
614 unsigned int i, j;
615 cpumask_var_t covered_cpus;
616 struct acpi_processor *pr;
617 struct acpi_psd_package *pdomain;
618 struct acpi_processor *match_pr;
619 struct acpi_psd_package *match_pdomain;
620
621 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
622 return -ENOMEM;
623
624 mutex_lock(&performance_mutex);
625
626 /*
627 * Check if another driver has already registered, and abort before
628 * changing pr->performance if it has. Check input data as well.
629 */
630 for_each_possible_cpu(i) {
631 pr = per_cpu(processors, i);
632 if (!pr) {
633 /* Look only at processors in ACPI namespace */
634 continue;
635 }
636
637 if (pr->performance) {
638 retval = -EBUSY;
639 goto err_out;
640 }
641
642 if (!performance || !per_cpu_ptr(performance, i)) {
643 retval = -EINVAL;
644 goto err_out;
645 }
646 }
647
648 /* Call _PSD for all CPUs */
649 for_each_possible_cpu(i) {
650 pr = per_cpu(processors, i);
651 if (!pr)
652 continue;
653
654 pr->performance = per_cpu_ptr(performance, i);
655 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
656 if (acpi_processor_get_psd(pr)) {
657 retval = -EINVAL;
658 continue;
659 }
660 }
661 if (retval)
662 goto err_ret;
663
664 /*
665 * Now that we have _PSD data from all CPUs, lets setup P-state
666 * domain info.
667 */
668 for_each_possible_cpu(i) {
669 pr = per_cpu(processors, i);
670 if (!pr)
671 continue;
672
673 if (cpumask_test_cpu(i, covered_cpus))
674 continue;
675
676 pdomain = &(pr->performance->domain_info);
677 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
678 cpumask_set_cpu(i, covered_cpus);
679 if (pdomain->num_processors <= 1)
680 continue;
681
682 /* Validate the Domain info */
683 count_target = pdomain->num_processors;
684 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
685 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
686 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
687 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
688 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
689 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
690
691 for_each_possible_cpu(j) {
692 if (i == j)
693 continue;
694
695 match_pr = per_cpu(processors, j);
696 if (!match_pr)
697 continue;
698
699 match_pdomain = &(match_pr->performance->domain_info);
700 if (match_pdomain->domain != pdomain->domain)
701 continue;
702
703 /* Here i and j are in the same domain */
704
705 if (match_pdomain->num_processors != count_target) {
706 retval = -EINVAL;
707 goto err_ret;
708 }
709
710 if (pdomain->coord_type != match_pdomain->coord_type) {
711 retval = -EINVAL;
712 goto err_ret;
713 }
714
715 cpumask_set_cpu(j, covered_cpus);
716 cpumask_set_cpu(j, pr->performance->shared_cpu_map);
717 }
718
719 for_each_possible_cpu(j) {
720 if (i == j)
721 continue;
722
723 match_pr = per_cpu(processors, j);
724 if (!match_pr)
725 continue;
726
727 match_pdomain = &(match_pr->performance->domain_info);
728 if (match_pdomain->domain != pdomain->domain)
729 continue;
730
731 match_pr->performance->shared_type =
732 pr->performance->shared_type;
733 cpumask_copy(match_pr->performance->shared_cpu_map,
734 pr->performance->shared_cpu_map);
735 }
736 }
737
738 err_ret:
739 for_each_possible_cpu(i) {
740 pr = per_cpu(processors, i);
741 if (!pr || !pr->performance)
742 continue;
743
744 /* Assume no coordination on any error parsing domain info */
745 if (retval) {
746 cpumask_clear(pr->performance->shared_cpu_map);
747 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
748 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
749 }
750 pr->performance = NULL; /* Will be set for real in register */
751 }
752
753 err_out:
754 mutex_unlock(&performance_mutex);
755 free_cpumask_var(covered_cpus);
756 return retval;
757 }
758 EXPORT_SYMBOL(acpi_processor_preregister_performance);
759
760 int
761 acpi_processor_register_performance(struct acpi_processor_performance
762 *performance, unsigned int cpu)
763 {
764 struct acpi_processor *pr;
765
766 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
767 return -EINVAL;
768
769 mutex_lock(&performance_mutex);
770
771 pr = per_cpu(processors, cpu);
772 if (!pr) {
773 mutex_unlock(&performance_mutex);
774 return -ENODEV;
775 }
776
777 if (pr->performance) {
778 mutex_unlock(&performance_mutex);
779 return -EBUSY;
780 }
781
782 WARN_ON(!performance);
783
784 pr->performance = performance;
785
786 if (acpi_processor_get_performance_info(pr)) {
787 pr->performance = NULL;
788 mutex_unlock(&performance_mutex);
789 return -EIO;
790 }
791
792 mutex_unlock(&performance_mutex);
793 return 0;
794 }
795
796 EXPORT_SYMBOL(acpi_processor_register_performance);
797
798 void
799 acpi_processor_unregister_performance(struct acpi_processor_performance
800 *performance, unsigned int cpu)
801 {
802 struct acpi_processor *pr;
803
804 mutex_lock(&performance_mutex);
805
806 pr = per_cpu(processors, cpu);
807 if (!pr) {
808 mutex_unlock(&performance_mutex);
809 return;
810 }
811
812 if (pr->performance)
813 kfree(pr->performance->states);
814 pr->performance = NULL;
815
816 mutex_unlock(&performance_mutex);
817
818 return;
819 }
820
821 EXPORT_SYMBOL(acpi_processor_unregister_performance);
Linus' kernel tree