?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
FRV: Use generic show_interrupts()
[cris-mirror.git] / drivers / acpi / processor_throttling.c
blobfa84e97443301d5a855db667fce2eceeb9a6f1c7
1 /*
2 * processor_throttling.c - Throttling submodule of the ACPI processor driver
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 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or (at
15 * your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License along
23 * with this program; if not, write to the Free Software Foundation, Inc.,
24 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
25 *
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 */
28
29 #include <linux/kernel.h>
30 #include <linux/module.h>
31 #include <linux/slab.h>
32 #include <linux/init.h>
33 #include <linux/sched.h>
34 #include <linux/cpufreq.h>
35
36 #include <asm/io.h>
37 #include <asm/uaccess.h>
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 _COMPONENT ACPI_PROCESSOR_COMPONENT
47 ACPI_MODULE_NAME("processor_throttling");
48
49 /* ignore_tpc:
50 * 0 -> acpi processor driver doesn't ignore _TPC values
51 * 1 -> acpi processor driver ignores _TPC values
52 */
53 static int ignore_tpc;
54 module_param(ignore_tpc, int, 0644);
55 MODULE_PARM_DESC(ignore_tpc, "Disable broken BIOS _TPC throttling support");
56
57 struct throttling_tstate {
58 unsigned int cpu; /* cpu nr */
59 int target_state; /* target T-state */
60 };
61
62 #define THROTTLING_PRECHANGE (1)
63 #define THROTTLING_POSTCHANGE (2)
64
65 static int acpi_processor_get_throttling(struct acpi_processor *pr);
66 int acpi_processor_set_throttling(struct acpi_processor *pr,
67 int state, bool force);
68
69 static int acpi_processor_update_tsd_coord(void)
70 {
71 int count, count_target;
72 int retval = 0;
73 unsigned int i, j;
74 cpumask_var_t covered_cpus;
75 struct acpi_processor *pr, *match_pr;
76 struct acpi_tsd_package *pdomain, *match_pdomain;
77 struct acpi_processor_throttling *pthrottling, *match_pthrottling;
78
79 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
80 return -ENOMEM;
81
82 /*
83 * Now that we have _TSD data from all CPUs, lets setup T-state
84 * coordination between all CPUs.
85 */
86 for_each_possible_cpu(i) {
87 pr = per_cpu(processors, i);
88 if (!pr)
89 continue;
90
91 /* Basic validity check for domain info */
92 pthrottling = &(pr->throttling);
93
94 /*
95 * If tsd package for one cpu is invalid, the coordination
96 * among all CPUs is thought as invalid.
97 * Maybe it is ugly.
98 */
99 if (!pthrottling->tsd_valid_flag) {
100 retval = -EINVAL;
101 break;
102 }
103 }
104 if (retval)
105 goto err_ret;
106
107 for_each_possible_cpu(i) {
108 pr = per_cpu(processors, i);
109 if (!pr)
110 continue;
111
112 if (cpumask_test_cpu(i, covered_cpus))
113 continue;
114 pthrottling = &pr->throttling;
115
116 pdomain = &(pthrottling->domain_info);
117 cpumask_set_cpu(i, pthrottling->shared_cpu_map);
118 cpumask_set_cpu(i, covered_cpus);
119 /*
120 * If the number of processor in the TSD domain is 1, it is
121 * unnecessary to parse the coordination for this CPU.
122 */
123 if (pdomain->num_processors <= 1)
124 continue;
125
126 /* Validate the Domain info */
127 count_target = pdomain->num_processors;
128 count = 1;
129
130 for_each_possible_cpu(j) {
131 if (i == j)
132 continue;
133
134 match_pr = per_cpu(processors, j);
135 if (!match_pr)
136 continue;
137
138 match_pthrottling = &(match_pr->throttling);
139 match_pdomain = &(match_pthrottling->domain_info);
140 if (match_pdomain->domain != pdomain->domain)
141 continue;
142
143 /* Here i and j are in the same domain.
144 * If two TSD packages have the same domain, they
145 * should have the same num_porcessors and
146 * coordination type. Otherwise it will be regarded
147 * as illegal.
148 */
149 if (match_pdomain->num_processors != count_target) {
150 retval = -EINVAL;
151 goto err_ret;
152 }
153
154 if (pdomain->coord_type != match_pdomain->coord_type) {
155 retval = -EINVAL;
156 goto err_ret;
157 }
158
159 cpumask_set_cpu(j, covered_cpus);
160 cpumask_set_cpu(j, pthrottling->shared_cpu_map);
161 count++;
162 }
163 for_each_possible_cpu(j) {
164 if (i == j)
165 continue;
166
167 match_pr = per_cpu(processors, j);
168 if (!match_pr)
169 continue;
170
171 match_pthrottling = &(match_pr->throttling);
172 match_pdomain = &(match_pthrottling->domain_info);
173 if (match_pdomain->domain != pdomain->domain)
174 continue;
175
176 /*
177 * If some CPUS have the same domain, they
178 * will have the same shared_cpu_map.
179 */
180 cpumask_copy(match_pthrottling->shared_cpu_map,
181 pthrottling->shared_cpu_map);
182 }
183 }
184
185 err_ret:
186 free_cpumask_var(covered_cpus);
187
188 for_each_possible_cpu(i) {
189 pr = per_cpu(processors, i);
190 if (!pr)
191 continue;
192
193 /*
194 * Assume no coordination on any error parsing domain info.
195 * The coordination type will be forced as SW_ALL.
196 */
197 if (retval) {
198 pthrottling = &(pr->throttling);
199 cpumask_clear(pthrottling->shared_cpu_map);
200 cpumask_set_cpu(i, pthrottling->shared_cpu_map);
201 pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL;
202 }
203 }
204
205 return retval;
206 }
207
208 /*
209 * Update the T-state coordination after the _TSD
210 * data for all cpus is obtained.
211 */
212 void acpi_processor_throttling_init(void)
213 {
214 if (acpi_processor_update_tsd_coord())
215 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
216 "Assume no T-state coordination\n"));
217
218 return;
219 }
220
221 static int acpi_processor_throttling_notifier(unsigned long event, void *data)
222 {
223 struct throttling_tstate *p_tstate = data;
224 struct acpi_processor *pr;
225 unsigned int cpu ;
226 int target_state;
227 struct acpi_processor_limit *p_limit;
228 struct acpi_processor_throttling *p_throttling;
229
230 cpu = p_tstate->cpu;
231 pr = per_cpu(processors, cpu);
232 if (!pr) {
233 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Invalid pr pointer\n"));
234 return 0;
235 }
236 if (!pr->flags.throttling) {
237 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Throttling control is "
238 "unsupported on CPU %d\n", cpu));
239 return 0;
240 }
241 target_state = p_tstate->target_state;
242 p_throttling = &(pr->throttling);
243 switch (event) {
244 case THROTTLING_PRECHANGE:
245 /*
246 * Prechange event is used to choose one proper t-state,
247 * which meets the limits of thermal, user and _TPC.
248 */
249 p_limit = &pr->limit;
250 if (p_limit->thermal.tx > target_state)
251 target_state = p_limit->thermal.tx;
252 if (p_limit->user.tx > target_state)
253 target_state = p_limit->user.tx;
254 if (pr->throttling_platform_limit > target_state)
255 target_state = pr->throttling_platform_limit;
256 if (target_state >= p_throttling->state_count) {
257 printk(KERN_WARNING
258 "Exceed the limit of T-state \n");
259 target_state = p_throttling->state_count - 1;
260 }
261 p_tstate->target_state = target_state;
262 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PreChange Event:"
263 "target T-state of CPU %d is T%d\n",
264 cpu, target_state));
265 break;
266 case THROTTLING_POSTCHANGE:
267 /*
268 * Postchange event is only used to update the
269 * T-state flag of acpi_processor_throttling.
270 */
271 p_throttling->state = target_state;
272 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PostChange Event:"
273 "CPU %d is switched to T%d\n",
274 cpu, target_state));
275 break;
276 default:
277 printk(KERN_WARNING
278 "Unsupported Throttling notifier event\n");
279 break;
280 }
281
282 return 0;
283 }
284
285 /*
286 * _TPC - Throttling Present Capabilities
287 */
288 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
289 {
290 acpi_status status = 0;
291 unsigned long long tpc = 0;
292
293 if (!pr)
294 return -EINVAL;
295
296 if (ignore_tpc)
297 goto end;
298
299 status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc);
300 if (ACPI_FAILURE(status)) {
301 if (status != AE_NOT_FOUND) {
302 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TPC"));
303 }
304 return -ENODEV;
305 }
306
307 end:
308 pr->throttling_platform_limit = (int)tpc;
309 return 0;
310 }
311
312 int acpi_processor_tstate_has_changed(struct acpi_processor *pr)
313 {
314 int result = 0;
315 int throttling_limit;
316 int current_state;
317 struct acpi_processor_limit *limit;
318 int target_state;
319
320 if (ignore_tpc)
321 return 0;
322
323 result = acpi_processor_get_platform_limit(pr);
324 if (result) {
325 /* Throttling Limit is unsupported */
326 return result;
327 }
328
329 throttling_limit = pr->throttling_platform_limit;
330 if (throttling_limit >= pr->throttling.state_count) {
331 /* Uncorrect Throttling Limit */
332 return -EINVAL;
333 }
334
335 current_state = pr->throttling.state;
336 if (current_state > throttling_limit) {
337 /*
338 * The current state can meet the requirement of
339 * _TPC limit. But it is reasonable that OSPM changes
340 * t-states from high to low for better performance.
341 * Of course the limit condition of thermal
342 * and user should be considered.
343 */
344 limit = &pr->limit;
345 target_state = throttling_limit;
346 if (limit->thermal.tx > target_state)
347 target_state = limit->thermal.tx;
348 if (limit->user.tx > target_state)
349 target_state = limit->user.tx;
350 } else if (current_state == throttling_limit) {
351 /*
352 * Unnecessary to change the throttling state
353 */
354 return 0;
355 } else {
356 /*
357 * If the current state is lower than the limit of _TPC, it
358 * will be forced to switch to the throttling state defined
359 * by throttling_platfor_limit.
360 * Because the previous state meets with the limit condition
361 * of thermal and user, it is unnecessary to check it again.
362 */
363 target_state = throttling_limit;
364 }
365 return acpi_processor_set_throttling(pr, target_state, false);
366 }
367
368 /*
369 * This function is used to reevaluate whether the T-state is valid
370 * after one CPU is onlined/offlined.
371 * It is noted that it won't reevaluate the following properties for
372 * the T-state.
373 * 1. Control method.
374 * 2. the number of supported T-state
375 * 3. TSD domain
376 */
377 void acpi_processor_reevaluate_tstate(struct acpi_processor *pr,
378 unsigned long action)
379 {
380 int result = 0;
381
382 if (action == CPU_DEAD) {
383 /* When one CPU is offline, the T-state throttling
384 * will be invalidated.
385 */
386 pr->flags.throttling = 0;
387 return;
388 }
389 /* the following is to recheck whether the T-state is valid for
390 * the online CPU
391 */
392 if (!pr->throttling.state_count) {
393 /* If the number of T-state is invalid, it is
394 * invalidated.
395 */
396 pr->flags.throttling = 0;
397 return;
398 }
399 pr->flags.throttling = 1;
400
401 /* Disable throttling (if enabled). We'll let subsequent
402 * policy (e.g.thermal) decide to lower performance if it
403 * so chooses, but for now we'll crank up the speed.
404 */
405
406 result = acpi_processor_get_throttling(pr);
407 if (result)
408 goto end;
409
410 if (pr->throttling.state) {
411 result = acpi_processor_set_throttling(pr, 0, false);
412 if (result)
413 goto end;
414 }
415
416 end:
417 if (result)
418 pr->flags.throttling = 0;
419 }
420 /*
421 * _PTC - Processor Throttling Control (and status) register location
422 */
423 static int acpi_processor_get_throttling_control(struct acpi_processor *pr)
424 {
425 int result = 0;
426 acpi_status status = 0;
427 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
428 union acpi_object *ptc = NULL;
429 union acpi_object obj = { 0 };
430 struct acpi_processor_throttling *throttling;
431
432 status = acpi_evaluate_object(pr->handle, "_PTC", NULL, &buffer);
433 if (ACPI_FAILURE(status)) {
434 if (status != AE_NOT_FOUND) {
435 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTC"));
436 }
437 return -ENODEV;
438 }
439
440 ptc = (union acpi_object *)buffer.pointer;
441 if (!ptc || (ptc->type != ACPI_TYPE_PACKAGE)
442 || (ptc->package.count != 2)) {
443 printk(KERN_ERR PREFIX "Invalid _PTC data\n");
444 result = -EFAULT;
445 goto end;
446 }
447
448 /*
449 * control_register
450 */
451
452 obj = ptc->package.elements[0];
453
454 if ((obj.type != ACPI_TYPE_BUFFER)
455 || (obj.buffer.length < sizeof(struct acpi_ptc_register))
456 || (obj.buffer.pointer == NULL)) {
457 printk(KERN_ERR PREFIX
458 "Invalid _PTC data (control_register)\n");
459 result = -EFAULT;
460 goto end;
461 }
462 memcpy(&pr->throttling.control_register, obj.buffer.pointer,
463 sizeof(struct acpi_ptc_register));
464
465 /*
466 * status_register
467 */
468
469 obj = ptc->package.elements[1];
470
471 if ((obj.type != ACPI_TYPE_BUFFER)
472 || (obj.buffer.length < sizeof(struct acpi_ptc_register))
473 || (obj.buffer.pointer == NULL)) {
474 printk(KERN_ERR PREFIX "Invalid _PTC data (status_register)\n");
475 result = -EFAULT;
476 goto end;
477 }
478
479 memcpy(&pr->throttling.status_register, obj.buffer.pointer,
480 sizeof(struct acpi_ptc_register));
481
482 throttling = &pr->throttling;
483
484 if ((throttling->control_register.bit_width +
485 throttling->control_register.bit_offset) > 32) {
486 printk(KERN_ERR PREFIX "Invalid _PTC control register\n");
487 result = -EFAULT;
488 goto end;
489 }
490
491 if ((throttling->status_register.bit_width +
492 throttling->status_register.bit_offset) > 32) {
493 printk(KERN_ERR PREFIX "Invalid _PTC status register\n");
494 result = -EFAULT;
495 goto end;
496 }
497
498 end:
499 kfree(buffer.pointer);
500
501 return result;
502 }
503
504 /*
505 * _TSS - Throttling Supported States
506 */
507 static int acpi_processor_get_throttling_states(struct acpi_processor *pr)
508 {
509 int result = 0;
510 acpi_status status = AE_OK;
511 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
512 struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" };
513 struct acpi_buffer state = { 0, NULL };
514 union acpi_object *tss = NULL;
515 int i;
516
517 status = acpi_evaluate_object(pr->handle, "_TSS", NULL, &buffer);
518 if (ACPI_FAILURE(status)) {
519 if (status != AE_NOT_FOUND) {
520 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSS"));
521 }
522 return -ENODEV;
523 }
524
525 tss = buffer.pointer;
526 if (!tss || (tss->type != ACPI_TYPE_PACKAGE)) {
527 printk(KERN_ERR PREFIX "Invalid _TSS data\n");
528 result = -EFAULT;
529 goto end;
530 }
531
532 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n",
533 tss->package.count));
534
535 pr->throttling.state_count = tss->package.count;
536 pr->throttling.states_tss =
537 kmalloc(sizeof(struct acpi_processor_tx_tss) * tss->package.count,
538 GFP_KERNEL);
539 if (!pr->throttling.states_tss) {
540 result = -ENOMEM;
541 goto end;
542 }
543
544 for (i = 0; i < pr->throttling.state_count; i++) {
545
546 struct acpi_processor_tx_tss *tx =
547 (struct acpi_processor_tx_tss *)&(pr->throttling.
548 states_tss[i]);
549
550 state.length = sizeof(struct acpi_processor_tx_tss);
551 state.pointer = tx;
552
553 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
554
555 status = acpi_extract_package(&(tss->package.elements[i]),
556 &format, &state);
557 if (ACPI_FAILURE(status)) {
558 ACPI_EXCEPTION((AE_INFO, status, "Invalid _TSS data"));
559 result = -EFAULT;
560 kfree(pr->throttling.states_tss);
561 goto end;
562 }
563
564 if (!tx->freqpercentage) {
565 printk(KERN_ERR PREFIX
566 "Invalid _TSS data: freq is zero\n");
567 result = -EFAULT;
568 kfree(pr->throttling.states_tss);
569 goto end;
570 }
571 }
572
573 end:
574 kfree(buffer.pointer);
575
576 return result;
577 }
578
579 /*
580 * _TSD - T-State Dependencies
581 */
582 static int acpi_processor_get_tsd(struct acpi_processor *pr)
583 {
584 int result = 0;
585 acpi_status status = AE_OK;
586 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
587 struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" };
588 struct acpi_buffer state = { 0, NULL };
589 union acpi_object *tsd = NULL;
590 struct acpi_tsd_package *pdomain;
591 struct acpi_processor_throttling *pthrottling;
592
593 pthrottling = &pr->throttling;
594 pthrottling->tsd_valid_flag = 0;
595
596 status = acpi_evaluate_object(pr->handle, "_TSD", NULL, &buffer);
597 if (ACPI_FAILURE(status)) {
598 if (status != AE_NOT_FOUND) {
599 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSD"));
600 }
601 return -ENODEV;
602 }
603
604 tsd = buffer.pointer;
605 if (!tsd || (tsd->type != ACPI_TYPE_PACKAGE)) {
606 printk(KERN_ERR PREFIX "Invalid _TSD data\n");
607 result = -EFAULT;
608 goto end;
609 }
610
611 if (tsd->package.count != 1) {
612 printk(KERN_ERR PREFIX "Invalid _TSD data\n");
613 result = -EFAULT;
614 goto end;
615 }
616
617 pdomain = &(pr->throttling.domain_info);
618
619 state.length = sizeof(struct acpi_tsd_package);
620 state.pointer = pdomain;
621
622 status = acpi_extract_package(&(tsd->package.elements[0]),
623 &format, &state);
624 if (ACPI_FAILURE(status)) {
625 printk(KERN_ERR PREFIX "Invalid _TSD data\n");
626 result = -EFAULT;
627 goto end;
628 }
629
630 if (pdomain->num_entries != ACPI_TSD_REV0_ENTRIES) {
631 printk(KERN_ERR PREFIX "Unknown _TSD:num_entries\n");
632 result = -EFAULT;
633 goto end;
634 }
635
636 if (pdomain->revision != ACPI_TSD_REV0_REVISION) {
637 printk(KERN_ERR PREFIX "Unknown _TSD:revision\n");
638 result = -EFAULT;
639 goto end;
640 }
641
642 pthrottling = &pr->throttling;
643 pthrottling->tsd_valid_flag = 1;
644 pthrottling->shared_type = pdomain->coord_type;
645 cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map);
646 /*
647 * If the coordination type is not defined in ACPI spec,
648 * the tsd_valid_flag will be clear and coordination type
649 * will be forecd as DOMAIN_COORD_TYPE_SW_ALL.
650 */
651 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
652 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
653 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
654 pthrottling->tsd_valid_flag = 0;
655 pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL;
656 }
657
658 end:
659 kfree(buffer.pointer);
660 return result;
661 }
662
663 /* --------------------------------------------------------------------------
664 Throttling Control
665 -------------------------------------------------------------------------- */
666 static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr)
667 {
668 int state = 0;
669 u32 value = 0;
670 u32 duty_mask = 0;
671 u32 duty_value = 0;
672
673 if (!pr)
674 return -EINVAL;
675
676 if (!pr->flags.throttling)
677 return -ENODEV;
678
679 pr->throttling.state = 0;
680
681 duty_mask = pr->throttling.state_count - 1;
682
683 duty_mask <<= pr->throttling.duty_offset;
684
685 local_irq_disable();
686
687 value = inl(pr->throttling.address);
688
689 /*
690 * Compute the current throttling state when throttling is enabled
691 * (bit 4 is on).
692 */
693 if (value & 0x10) {
694 duty_value = value & duty_mask;
695 duty_value >>= pr->throttling.duty_offset;
696
697 if (duty_value)
698 state = pr->throttling.state_count - duty_value;
699 }
700
701 pr->throttling.state = state;
702
703 local_irq_enable();
704
705 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
706 "Throttling state is T%d (%d%% throttling applied)\n",
707 state, pr->throttling.states[state].performance));
708
709 return 0;
710 }
711
712 #ifdef CONFIG_X86
713 static int acpi_throttling_rdmsr(struct acpi_processor *pr,
714 u64 *value)
715 {
716 struct cpuinfo_x86 *c;
717 u64 msr_high, msr_low;
718 unsigned int cpu;
719 u64 msr = 0;
720 int ret = -1;
721
722 cpu = pr->id;
723 c = &cpu_data(cpu);
724
725 if ((c->x86_vendor != X86_VENDOR_INTEL) ||
726 !cpu_has(c, X86_FEATURE_ACPI)) {
727 printk(KERN_ERR PREFIX
728 "HARDWARE addr space,NOT supported yet\n");
729 } else {
730 msr_low = 0;
731 msr_high = 0;
732 rdmsr_safe(MSR_IA32_THERM_CONTROL,
733 (u32 *)&msr_low , (u32 *) &msr_high);
734 msr = (msr_high << 32) | msr_low;
735 *value = (u64) msr;
736 ret = 0;
737 }
738 return ret;
739 }
740
741 static int acpi_throttling_wrmsr(struct acpi_processor *pr, u64 value)
742 {
743 struct cpuinfo_x86 *c;
744 unsigned int cpu;
745 int ret = -1;
746 u64 msr;
747
748 cpu = pr->id;
749 c = &cpu_data(cpu);
750
751 if ((c->x86_vendor != X86_VENDOR_INTEL) ||
752 !cpu_has(c, X86_FEATURE_ACPI)) {
753 printk(KERN_ERR PREFIX
754 "HARDWARE addr space,NOT supported yet\n");
755 } else {
756 msr = value;
757 wrmsr_safe(MSR_IA32_THERM_CONTROL,
758 msr & 0xffffffff, msr >> 32);
759 ret = 0;
760 }
761 return ret;
762 }
763 #else
764 static int acpi_throttling_rdmsr(struct acpi_processor *pr,
765 u64 *value)
766 {
767 printk(KERN_ERR PREFIX
768 "HARDWARE addr space,NOT supported yet\n");
769 return -1;
770 }
771
772 static int acpi_throttling_wrmsr(struct acpi_processor *pr, u64 value)
773 {
774 printk(KERN_ERR PREFIX
775 "HARDWARE addr space,NOT supported yet\n");
776 return -1;
777 }
778 #endif
779
780 static int acpi_read_throttling_status(struct acpi_processor *pr,
781 u64 *value)
782 {
783 u32 bit_width, bit_offset;
784 u64 ptc_value;
785 u64 ptc_mask;
786 struct acpi_processor_throttling *throttling;
787 int ret = -1;
788
789 throttling = &pr->throttling;
790 switch (throttling->status_register.space_id) {
791 case ACPI_ADR_SPACE_SYSTEM_IO:
792 ptc_value = 0;
793 bit_width = throttling->status_register.bit_width;
794 bit_offset = throttling->status_register.bit_offset;
795
796 acpi_os_read_port((acpi_io_address) throttling->status_register.
797 address, (u32 *) &ptc_value,
798 (u32) (bit_width + bit_offset));
799 ptc_mask = (1 << bit_width) - 1;
800 *value = (u64) ((ptc_value >> bit_offset) & ptc_mask);
801 ret = 0;
802 break;
803 case ACPI_ADR_SPACE_FIXED_HARDWARE:
804 ret = acpi_throttling_rdmsr(pr, value);
805 break;
806 default:
807 printk(KERN_ERR PREFIX "Unknown addr space %d\n",
808 (u32) (throttling->status_register.space_id));
809 }
810 return ret;
811 }
812
813 static int acpi_write_throttling_state(struct acpi_processor *pr,
814 u64 value)
815 {
816 u32 bit_width, bit_offset;
817 u64 ptc_value;
818 u64 ptc_mask;
819 struct acpi_processor_throttling *throttling;
820 int ret = -1;
821
822 throttling = &pr->throttling;
823 switch (throttling->control_register.space_id) {
824 case ACPI_ADR_SPACE_SYSTEM_IO:
825 bit_width = throttling->control_register.bit_width;
826 bit_offset = throttling->control_register.bit_offset;
827 ptc_mask = (1 << bit_width) - 1;
828 ptc_value = value & ptc_mask;
829
830 acpi_os_write_port((acpi_io_address) throttling->
831 control_register.address,
832 (u32) (ptc_value << bit_offset),
833 (u32) (bit_width + bit_offset));
834 ret = 0;
835 break;
836 case ACPI_ADR_SPACE_FIXED_HARDWARE:
837 ret = acpi_throttling_wrmsr(pr, value);
838 break;
839 default:
840 printk(KERN_ERR PREFIX "Unknown addr space %d\n",
841 (u32) (throttling->control_register.space_id));
842 }
843 return ret;
844 }
845
846 static int acpi_get_throttling_state(struct acpi_processor *pr,
847 u64 value)
848 {
849 int i;
850
851 for (i = 0; i < pr->throttling.state_count; i++) {
852 struct acpi_processor_tx_tss *tx =
853 (struct acpi_processor_tx_tss *)&(pr->throttling.
854 states_tss[i]);
855 if (tx->control == value)
856 return i;
857 }
858 return -1;
859 }
860
861 static int acpi_get_throttling_value(struct acpi_processor *pr,
862 int state, u64 *value)
863 {
864 int ret = -1;
865
866 if (state >= 0 && state <= pr->throttling.state_count) {
867 struct acpi_processor_tx_tss *tx =
868 (struct acpi_processor_tx_tss *)&(pr->throttling.
869 states_tss[state]);
870 *value = tx->control;
871 ret = 0;
872 }
873 return ret;
874 }
875
876 static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr)
877 {
878 int state = 0;
879 int ret;
880 u64 value;
881
882 if (!pr)
883 return -EINVAL;
884
885 if (!pr->flags.throttling)
886 return -ENODEV;
887
888 pr->throttling.state = 0;
889
890 value = 0;
891 ret = acpi_read_throttling_status(pr, &value);
892 if (ret >= 0) {
893 state = acpi_get_throttling_state(pr, value);
894 if (state == -1) {
895 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
896 "Invalid throttling state, reset\n"));
897 state = 0;
898 ret = acpi_processor_set_throttling(pr, state, true);
899 if (ret)
900 return ret;
901 }
902 pr->throttling.state = state;
903 }
904
905 return 0;
906 }
907
908 static int acpi_processor_get_throttling(struct acpi_processor *pr)
909 {
910 cpumask_var_t saved_mask;
911 int ret;
912
913 if (!pr)
914 return -EINVAL;
915
916 if (!pr->flags.throttling)
917 return -ENODEV;
918
919 if (!alloc_cpumask_var(&saved_mask, GFP_KERNEL))
920 return -ENOMEM;
921
922 /*
923 * Migrate task to the cpu pointed by pr.
924 */
925 cpumask_copy(saved_mask, &current->cpus_allowed);
926 /* FIXME: use work_on_cpu() */
927 if (set_cpus_allowed_ptr(current, cpumask_of(pr->id))) {
928 /* Can't migrate to the target pr->id CPU. Exit */
929 free_cpumask_var(saved_mask);
930 return -ENODEV;
931 }
932 ret = pr->throttling.acpi_processor_get_throttling(pr);
933 /* restore the previous state */
934 set_cpus_allowed_ptr(current, saved_mask);
935 free_cpumask_var(saved_mask);
936
937 return ret;
938 }
939
940 static int acpi_processor_get_fadt_info(struct acpi_processor *pr)
941 {
942 int i, step;
943
944 if (!pr->throttling.address) {
945 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n"));
946 return -EINVAL;
947 } else if (!pr->throttling.duty_width) {
948 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling states\n"));
949 return -EINVAL;
950 }
951 /* TBD: Support duty_cycle values that span bit 4. */
952 else if ((pr->throttling.duty_offset + pr->throttling.duty_width) > 4) {
953 printk(KERN_WARNING PREFIX "duty_cycle spans bit 4\n");
954 return -EINVAL;
955 }
956
957 pr->throttling.state_count = 1 << acpi_gbl_FADT.duty_width;
958
959 /*
960 * Compute state values. Note that throttling displays a linear power
961 * performance relationship (at 50% performance the CPU will consume
962 * 50% power). Values are in 1/10th of a percent to preserve accuracy.
963 */
964
965 step = (1000 / pr->throttling.state_count);
966
967 for (i = 0; i < pr->throttling.state_count; i++) {
968 pr->throttling.states[i].performance = 1000 - step * i;
969 pr->throttling.states[i].power = 1000 - step * i;
970 }
971 return 0;
972 }
973
974 static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr,
975 int state, bool force)
976 {
977 u32 value = 0;
978 u32 duty_mask = 0;
979 u32 duty_value = 0;
980
981 if (!pr)
982 return -EINVAL;
983
984 if ((state < 0) || (state > (pr->throttling.state_count - 1)))
985 return -EINVAL;
986
987 if (!pr->flags.throttling)
988 return -ENODEV;
989
990 if (!force && (state == pr->throttling.state))
991 return 0;
992
993 if (state < pr->throttling_platform_limit)
994 return -EPERM;
995 /*
996 * Calculate the duty_value and duty_mask.
997 */
998 if (state) {
999 duty_value = pr->throttling.state_count - state;
1000
1001 duty_value <<= pr->throttling.duty_offset;
1002
1003 /* Used to clear all duty_value bits */
1004 duty_mask = pr->throttling.state_count - 1;
1005
1006 duty_mask <<= acpi_gbl_FADT.duty_offset;
1007 duty_mask = ~duty_mask;
1008 }
1009
1010 local_irq_disable();
1011
1012 /*
1013 * Disable throttling by writing a 0 to bit 4. Note that we must
1014 * turn it off before you can change the duty_value.
1015 */
1016 value = inl(pr->throttling.address);
1017 if (value & 0x10) {
1018 value &= 0xFFFFFFEF;
1019 outl(value, pr->throttling.address);
1020 }
1021
1022 /*
1023 * Write the new duty_value and then enable throttling. Note
1024 * that a state value of 0 leaves throttling disabled.
1025 */
1026 if (state) {
1027 value &= duty_mask;
1028 value |= duty_value;
1029 outl(value, pr->throttling.address);
1030
1031 value |= 0x00000010;
1032 outl(value, pr->throttling.address);
1033 }
1034
1035 pr->throttling.state = state;
1036
1037 local_irq_enable();
1038
1039 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1040 "Throttling state set to T%d (%d%%)\n", state,
1041 (pr->throttling.states[state].performance ? pr->
1042 throttling.states[state].performance / 10 : 0)));
1043
1044 return 0;
1045 }
1046
1047 static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr,
1048 int state, bool force)
1049 {
1050 int ret;
1051 u64 value;
1052
1053 if (!pr)
1054 return -EINVAL;
1055
1056 if ((state < 0) || (state > (pr->throttling.state_count - 1)))
1057 return -EINVAL;
1058
1059 if (!pr->flags.throttling)
1060 return -ENODEV;
1061
1062 if (!force && (state == pr->throttling.state))
1063 return 0;
1064
1065 if (state < pr->throttling_platform_limit)
1066 return -EPERM;
1067
1068 value = 0;
1069 ret = acpi_get_throttling_value(pr, state, &value);
1070 if (ret >= 0) {
1071 acpi_write_throttling_state(pr, value);
1072 pr->throttling.state = state;
1073 }
1074
1075 return 0;
1076 }
1077
1078 int acpi_processor_set_throttling(struct acpi_processor *pr,
1079 int state, bool force)
1080 {
1081 cpumask_var_t saved_mask;
1082 int ret = 0;
1083 unsigned int i;
1084 struct acpi_processor *match_pr;
1085 struct acpi_processor_throttling *p_throttling;
1086 struct throttling_tstate t_state;
1087 cpumask_var_t online_throttling_cpus;
1088
1089 if (!pr)
1090 return -EINVAL;
1091
1092 if (!pr->flags.throttling)
1093 return -ENODEV;
1094
1095 if ((state < 0) || (state > (pr->throttling.state_count - 1)))
1096 return -EINVAL;
1097
1098 if (!alloc_cpumask_var(&saved_mask, GFP_KERNEL))
1099 return -ENOMEM;
1100
1101 if (!alloc_cpumask_var(&online_throttling_cpus, GFP_KERNEL)) {
1102 free_cpumask_var(saved_mask);
1103 return -ENOMEM;
1104 }
1105
1106 if (cpu_is_offline(pr->id)) {
1107 /*
1108 * the cpu pointed by pr->id is offline. Unnecessary to change
1109 * the throttling state any more.
1110 */
1111 return -ENODEV;
1112 }
1113
1114 cpumask_copy(saved_mask, &current->cpus_allowed);
1115 t_state.target_state = state;
1116 p_throttling = &(pr->throttling);
1117 cpumask_and(online_throttling_cpus, cpu_online_mask,
1118 p_throttling->shared_cpu_map);
1119 /*
1120 * The throttling notifier will be called for every
1121 * affected cpu in order to get one proper T-state.
1122 * The notifier event is THROTTLING_PRECHANGE.
1123 */
1124 for_each_cpu(i, online_throttling_cpus) {
1125 t_state.cpu = i;
1126 acpi_processor_throttling_notifier(THROTTLING_PRECHANGE,
1127 &t_state);
1128 }
1129 /*
1130 * The function of acpi_processor_set_throttling will be called
1131 * to switch T-state. If the coordination type is SW_ALL or HW_ALL,
1132 * it is necessary to call it for every affected cpu. Otherwise
1133 * it can be called only for the cpu pointed by pr.
1134 */
1135 if (p_throttling->shared_type == DOMAIN_COORD_TYPE_SW_ANY) {
1136 /* FIXME: use work_on_cpu() */
1137 if (set_cpus_allowed_ptr(current, cpumask_of(pr->id))) {
1138 /* Can't migrate to the pr->id CPU. Exit */
1139 ret = -ENODEV;
1140 goto exit;
1141 }
1142 ret = p_throttling->acpi_processor_set_throttling(pr,
1143 t_state.target_state, force);
1144 } else {
1145 /*
1146 * When the T-state coordination is SW_ALL or HW_ALL,
1147 * it is necessary to set T-state for every affected
1148 * cpus.
1149 */
1150 for_each_cpu(i, online_throttling_cpus) {
1151 match_pr = per_cpu(processors, i);
1152 /*
1153 * If the pointer is invalid, we will report the
1154 * error message and continue.
1155 */
1156 if (!match_pr) {
1157 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1158 "Invalid Pointer for CPU %d\n", i));
1159 continue;
1160 }
1161 /*
1162 * If the throttling control is unsupported on CPU i,
1163 * we will report the error message and continue.
1164 */
1165 if (!match_pr->flags.throttling) {
1166 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1167 "Throttling Controll is unsupported "
1168 "on CPU %d\n", i));
1169 continue;
1170 }
1171 t_state.cpu = i;
1172 /* FIXME: use work_on_cpu() */
1173 if (set_cpus_allowed_ptr(current, cpumask_of(i)))
1174 continue;
1175 ret = match_pr->throttling.
1176 acpi_processor_set_throttling(
1177 match_pr, t_state.target_state, force);
1178 }
1179 }
1180 /*
1181 * After the set_throttling is called, the
1182 * throttling notifier is called for every
1183 * affected cpu to update the T-states.
1184 * The notifier event is THROTTLING_POSTCHANGE
1185 */
1186 for_each_cpu(i, online_throttling_cpus) {
1187 t_state.cpu = i;
1188 acpi_processor_throttling_notifier(THROTTLING_POSTCHANGE,
1189 &t_state);
1190 }
1191 /* restore the previous state */
1192 /* FIXME: use work_on_cpu() */
1193 set_cpus_allowed_ptr(current, saved_mask);
1194 exit:
1195 free_cpumask_var(online_throttling_cpus);
1196 free_cpumask_var(saved_mask);
1197 return ret;
1198 }
1199
1200 int acpi_processor_get_throttling_info(struct acpi_processor *pr)
1201 {
1202 int result = 0;
1203 struct acpi_processor_throttling *pthrottling;
1204
1205 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1206 "pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n",
1207 pr->throttling.address,
1208 pr->throttling.duty_offset,
1209 pr->throttling.duty_width));
1210
1211 /*
1212 * Evaluate _PTC, _TSS and _TPC
1213 * They must all be present or none of them can be used.
1214 */
1215 if (acpi_processor_get_throttling_control(pr) ||
1216 acpi_processor_get_throttling_states(pr) ||
1217 acpi_processor_get_platform_limit(pr))
1218 {
1219 pr->throttling.acpi_processor_get_throttling =
1220 &acpi_processor_get_throttling_fadt;
1221 pr->throttling.acpi_processor_set_throttling =
1222 &acpi_processor_set_throttling_fadt;
1223 if (acpi_processor_get_fadt_info(pr))
1224 return 0;
1225 } else {
1226 pr->throttling.acpi_processor_get_throttling =
1227 &acpi_processor_get_throttling_ptc;
1228 pr->throttling.acpi_processor_set_throttling =
1229 &acpi_processor_set_throttling_ptc;
1230 }
1231
1232 /*
1233 * If TSD package for one CPU can't be parsed successfully, it means
1234 * that this CPU will have no coordination with other CPUs.
1235 */
1236 if (acpi_processor_get_tsd(pr)) {
1237 pthrottling = &pr->throttling;
1238 pthrottling->tsd_valid_flag = 0;
1239 cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map);
1240 pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL;
1241 }
1242
1243 /*
1244 * PIIX4 Errata: We don't support throttling on the original PIIX4.
1245 * This shouldn't be an issue as few (if any) mobile systems ever
1246 * used this part.
1247 */
1248 if (errata.piix4.throttle) {
1249 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1250 "Throttling not supported on PIIX4 A- or B-step\n"));
1251 return 0;
1252 }
1253
1254 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n",
1255 pr->throttling.state_count));
1256
1257 pr->flags.throttling = 1;
1258
1259 /*
1260 * Disable throttling (if enabled). We'll let subsequent policy (e.g.
1261 * thermal) decide to lower performance if it so chooses, but for now
1262 * we'll crank up the speed.
1263 */
1264
1265 result = acpi_processor_get_throttling(pr);
1266 if (result)
1267 goto end;
1268
1269 if (pr->throttling.state) {
1270 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1271 "Disabling throttling (was T%d)\n",
1272 pr->throttling.state));
1273 result = acpi_processor_set_throttling(pr, 0, false);
1274 if (result)
1275 goto end;
1276 }
1277
1278 end:
1279 if (result)
1280 pr->flags.throttling = 0;
1281
1282 return result;
1283 }
1284
CRIS linux kernel tree