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proc: Supply a function to remove a proc entry by PDE
[linux-2.6.git] / drivers / acpi / processor_perflib.c
blobe854582f29a672a5920500333e26a0b77b310e58
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 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
180 int 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
211 int 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 }
222 EXPORT_SYMBOL(acpi_processor_get_bios_limit);
223
224 void 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
234 void 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 */
248 void 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
265 static 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
327 #ifdef CONFIG_X86
328 /*
329 * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding
330 * in their ACPI data. Calculate the real values and fix up the _PSS data.
331 */
332 static void amd_fixup_frequency(struct acpi_processor_px *px, int i)
333 {
334 u32 hi, lo, fid, did;
335 int index = px->control & 0x00000007;
336
337 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
338 return;
339
340 if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
341 || boot_cpu_data.x86 == 0x11) {
342 rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi);
343 /*
344 * MSR C001_0064+:
345 * Bit 63: PstateEn. Read-write. If set, the P-state is valid.
346 */
347 if (!(hi & BIT(31)))
348 return;
349
350 fid = lo & 0x3f;
351 did = (lo >> 6) & 7;
352 if (boot_cpu_data.x86 == 0x10)
353 px->core_frequency = (100 * (fid + 0x10)) >> did;
354 else
355 px->core_frequency = (100 * (fid + 8)) >> did;
356 }
357 }
358 #else
359 static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
360 #endif
361
362 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
363 {
364 int result = 0;
365 acpi_status status = AE_OK;
366 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
367 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
368 struct acpi_buffer state = { 0, NULL };
369 union acpi_object *pss = NULL;
370 int i;
371 int last_invalid = -1;
372
373
374 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
375 if (ACPI_FAILURE(status)) {
376 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
377 return -ENODEV;
378 }
379
380 pss = buffer.pointer;
381 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
382 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
383 result = -EFAULT;
384 goto end;
385 }
386
387 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
388 pss->package.count));
389
390 pr->performance->state_count = pss->package.count;
391 pr->performance->states =
392 kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
393 GFP_KERNEL);
394 if (!pr->performance->states) {
395 result = -ENOMEM;
396 goto end;
397 }
398
399 for (i = 0; i < pr->performance->state_count; i++) {
400
401 struct acpi_processor_px *px = &(pr->performance->states[i]);
402
403 state.length = sizeof(struct acpi_processor_px);
404 state.pointer = px;
405
406 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
407
408 status = acpi_extract_package(&(pss->package.elements[i]),
409 &format, &state);
410 if (ACPI_FAILURE(status)) {
411 ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
412 result = -EFAULT;
413 kfree(pr->performance->states);
414 goto end;
415 }
416
417 amd_fixup_frequency(px, i);
418
419 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
420 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
421 i,
422 (u32) px->core_frequency,
423 (u32) px->power,
424 (u32) px->transition_latency,
425 (u32) px->bus_master_latency,
426 (u32) px->control, (u32) px->status));
427
428 /*
429 * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
430 */
431 if (!px->core_frequency ||
432 ((u32)(px->core_frequency * 1000) !=
433 (px->core_frequency * 1000))) {
434 printk(KERN_ERR FW_BUG PREFIX
435 "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
436 pr->id, px->core_frequency);
437 if (last_invalid == -1)
438 last_invalid = i;
439 } else {
440 if (last_invalid != -1) {
441 /*
442 * Copy this valid entry over last_invalid entry
443 */
444 memcpy(&(pr->performance->states[last_invalid]),
445 px, sizeof(struct acpi_processor_px));
446 ++last_invalid;
447 }
448 }
449 }
450
451 if (last_invalid == 0) {
452 printk(KERN_ERR FW_BUG PREFIX
453 "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
454 result = -EFAULT;
455 kfree(pr->performance->states);
456 pr->performance->states = NULL;
457 }
458
459 if (last_invalid > 0)
460 pr->performance->state_count = last_invalid;
461
462 end:
463 kfree(buffer.pointer);
464
465 return result;
466 }
467
468 int acpi_processor_get_performance_info(struct acpi_processor *pr)
469 {
470 int result = 0;
471 acpi_status status = AE_OK;
472 acpi_handle handle = NULL;
473
474 if (!pr || !pr->performance || !pr->handle)
475 return -EINVAL;
476
477 status = acpi_get_handle(pr->handle, "_PCT", &handle);
478 if (ACPI_FAILURE(status)) {
479 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
480 "ACPI-based processor performance control unavailable\n"));
481 return -ENODEV;
482 }
483
484 result = acpi_processor_get_performance_control(pr);
485 if (result)
486 goto update_bios;
487
488 result = acpi_processor_get_performance_states(pr);
489 if (result)
490 goto update_bios;
491
492 /* We need to call _PPC once when cpufreq starts */
493 if (ignore_ppc != 1)
494 result = acpi_processor_get_platform_limit(pr);
495
496 return result;
497
498 /*
499 * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
500 * the BIOS is older than the CPU and does not know its frequencies
501 */
502 update_bios:
503 #ifdef CONFIG_X86
504 if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){
505 if(boot_cpu_has(X86_FEATURE_EST))
506 printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
507 "frequency support\n");
508 }
509 #endif
510 return result;
511 }
512 EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info);
513 int acpi_processor_notify_smm(struct module *calling_module)
514 {
515 acpi_status status;
516 static int is_done = 0;
517
518
519 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
520 return -EBUSY;
521
522 if (!try_module_get(calling_module))
523 return -EINVAL;
524
525 /* is_done is set to negative if an error occurred,
526 * and to postitive if _no_ error occurred, but SMM
527 * was already notified. This avoids double notification
528 * which might lead to unexpected results...
529 */
530 if (is_done > 0) {
531 module_put(calling_module);
532 return 0;
533 } else if (is_done < 0) {
534 module_put(calling_module);
535 return is_done;
536 }
537
538 is_done = -EIO;
539
540 /* Can't write pstate_control to smi_command if either value is zero */
541 if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
542 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
543 module_put(calling_module);
544 return 0;
545 }
546
547 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
548 "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
549 acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
550
551 status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
552 (u32) acpi_gbl_FADT.pstate_control, 8);
553 if (ACPI_FAILURE(status)) {
554 ACPI_EXCEPTION((AE_INFO, status,
555 "Failed to write pstate_control [0x%x] to "
556 "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
557 acpi_gbl_FADT.smi_command));
558 module_put(calling_module);
559 return status;
560 }
561
562 /* Success. If there's no _PPC, we need to fear nothing, so
563 * we can allow the cpufreq driver to be rmmod'ed. */
564 is_done = 1;
565
566 if (!(acpi_processor_ppc_status & PPC_IN_USE))
567 module_put(calling_module);
568
569 return 0;
570 }
571
572 EXPORT_SYMBOL(acpi_processor_notify_smm);
573
574 static int acpi_processor_get_psd(struct acpi_processor *pr)
575 {
576 int result = 0;
577 acpi_status status = AE_OK;
578 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
579 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
580 struct acpi_buffer state = {0, NULL};
581 union acpi_object *psd = NULL;
582 struct acpi_psd_package *pdomain;
583
584 status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
585 if (ACPI_FAILURE(status)) {
586 return -ENODEV;
587 }
588
589 psd = buffer.pointer;
590 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
591 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
592 result = -EFAULT;
593 goto end;
594 }
595
596 if (psd->package.count != 1) {
597 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
598 result = -EFAULT;
599 goto end;
600 }
601
602 pdomain = &(pr->performance->domain_info);
603
604 state.length = sizeof(struct acpi_psd_package);
605 state.pointer = pdomain;
606
607 status = acpi_extract_package(&(psd->package.elements[0]),
608 &format, &state);
609 if (ACPI_FAILURE(status)) {
610 printk(KERN_ERR PREFIX "Invalid _PSD data\n");
611 result = -EFAULT;
612 goto end;
613 }
614
615 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
616 printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
617 result = -EFAULT;
618 goto end;
619 }
620
621 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
622 printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
623 result = -EFAULT;
624 goto end;
625 }
626
627 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
628 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
629 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
630 printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
631 result = -EFAULT;
632 goto end;
633 }
634 end:
635 kfree(buffer.pointer);
636 return result;
637 }
638
639 int acpi_processor_preregister_performance(
640 struct acpi_processor_performance __percpu *performance)
641 {
642 int count, count_target;
643 int retval = 0;
644 unsigned int i, j;
645 cpumask_var_t covered_cpus;
646 struct acpi_processor *pr;
647 struct acpi_psd_package *pdomain;
648 struct acpi_processor *match_pr;
649 struct acpi_psd_package *match_pdomain;
650
651 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
652 return -ENOMEM;
653
654 mutex_lock(&performance_mutex);
655
656 /*
657 * Check if another driver has already registered, and abort before
658 * changing pr->performance if it has. Check input data as well.
659 */
660 for_each_possible_cpu(i) {
661 pr = per_cpu(processors, i);
662 if (!pr) {
663 /* Look only at processors in ACPI namespace */
664 continue;
665 }
666
667 if (pr->performance) {
668 retval = -EBUSY;
669 goto err_out;
670 }
671
672 if (!performance || !per_cpu_ptr(performance, i)) {
673 retval = -EINVAL;
674 goto err_out;
675 }
676 }
677
678 /* Call _PSD for all CPUs */
679 for_each_possible_cpu(i) {
680 pr = per_cpu(processors, i);
681 if (!pr)
682 continue;
683
684 pr->performance = per_cpu_ptr(performance, i);
685 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
686 if (acpi_processor_get_psd(pr)) {
687 retval = -EINVAL;
688 continue;
689 }
690 }
691 if (retval)
692 goto err_ret;
693
694 /*
695 * Now that we have _PSD data from all CPUs, lets setup P-state
696 * domain info.
697 */
698 for_each_possible_cpu(i) {
699 pr = per_cpu(processors, i);
700 if (!pr)
701 continue;
702
703 if (cpumask_test_cpu(i, covered_cpus))
704 continue;
705
706 pdomain = &(pr->performance->domain_info);
707 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
708 cpumask_set_cpu(i, covered_cpus);
709 if (pdomain->num_processors <= 1)
710 continue;
711
712 /* Validate the Domain info */
713 count_target = pdomain->num_processors;
714 count = 1;
715 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
716 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
717 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
718 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
719 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
720 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
721
722 for_each_possible_cpu(j) {
723 if (i == j)
724 continue;
725
726 match_pr = per_cpu(processors, j);
727 if (!match_pr)
728 continue;
729
730 match_pdomain = &(match_pr->performance->domain_info);
731 if (match_pdomain->domain != pdomain->domain)
732 continue;
733
734 /* Here i and j are in the same domain */
735
736 if (match_pdomain->num_processors != count_target) {
737 retval = -EINVAL;
738 goto err_ret;
739 }
740
741 if (pdomain->coord_type != match_pdomain->coord_type) {
742 retval = -EINVAL;
743 goto err_ret;
744 }
745
746 cpumask_set_cpu(j, covered_cpus);
747 cpumask_set_cpu(j, pr->performance->shared_cpu_map);
748 count++;
749 }
750
751 for_each_possible_cpu(j) {
752 if (i == j)
753 continue;
754
755 match_pr = per_cpu(processors, j);
756 if (!match_pr)
757 continue;
758
759 match_pdomain = &(match_pr->performance->domain_info);
760 if (match_pdomain->domain != pdomain->domain)
761 continue;
762
763 match_pr->performance->shared_type =
764 pr->performance->shared_type;
765 cpumask_copy(match_pr->performance->shared_cpu_map,
766 pr->performance->shared_cpu_map);
767 }
768 }
769
770 err_ret:
771 for_each_possible_cpu(i) {
772 pr = per_cpu(processors, i);
773 if (!pr || !pr->performance)
774 continue;
775
776 /* Assume no coordination on any error parsing domain info */
777 if (retval) {
778 cpumask_clear(pr->performance->shared_cpu_map);
779 cpumask_set_cpu(i, pr->performance->shared_cpu_map);
780 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
781 }
782 pr->performance = NULL; /* Will be set for real in register */
783 }
784
785 err_out:
786 mutex_unlock(&performance_mutex);
787 free_cpumask_var(covered_cpus);
788 return retval;
789 }
790 EXPORT_SYMBOL(acpi_processor_preregister_performance);
791
792 int
793 acpi_processor_register_performance(struct acpi_processor_performance
794 *performance, unsigned int cpu)
795 {
796 struct acpi_processor *pr;
797
798 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
799 return -EINVAL;
800
801 mutex_lock(&performance_mutex);
802
803 pr = per_cpu(processors, cpu);
804 if (!pr) {
805 mutex_unlock(&performance_mutex);
806 return -ENODEV;
807 }
808
809 if (pr->performance) {
810 mutex_unlock(&performance_mutex);
811 return -EBUSY;
812 }
813
814 WARN_ON(!performance);
815
816 pr->performance = performance;
817
818 if (acpi_processor_get_performance_info(pr)) {
819 pr->performance = NULL;
820 mutex_unlock(&performance_mutex);
821 return -EIO;
822 }
823
824 mutex_unlock(&performance_mutex);
825 return 0;
826 }
827
828 EXPORT_SYMBOL(acpi_processor_register_performance);
829
830 void
831 acpi_processor_unregister_performance(struct acpi_processor_performance
832 *performance, unsigned int cpu)
833 {
834 struct acpi_processor *pr;
835
836 mutex_lock(&performance_mutex);
837
838 pr = per_cpu(processors, cpu);
839 if (!pr) {
840 mutex_unlock(&performance_mutex);
841 return;
842 }
843
844 if (pr->performance)
845 kfree(pr->performance->states);
846 pr->performance = NULL;
847
848 mutex_unlock(&performance_mutex);
849
850 return;
851 }
852
853 EXPORT_SYMBOL(acpi_processor_unregister_performance);
Linus' kernel tree