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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/init.h>
32 #include <linux/sched.h>
33 #include <linux/cpufreq.h>
34 #include <linux/proc_fs.h>
35 #include <linux/seq_file.h>
36
37 #include <asm/io.h>
38 #include <asm/uaccess.h>
39
40 #include <acpi/acpi_bus.h>
41 #include <acpi/acpi_drivers.h>
42 #include <acpi/processor.h>
43
44 #define ACPI_PROCESSOR_CLASS            "processor"
45 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
46 ACPI_MODULE_NAME("processor_throttling");
47
48 /* ignore_tpc:
49  *  0 -> acpi processor driver doesn't ignore _TPC values
50  *  1 -> acpi processor driver ignores _TPC values
51  */
52 static int ignore_tpc;
53 module_param(ignore_tpc, int, 0644);
54 MODULE_PARM_DESC(ignore_tpc, "Disable broken BIOS _TPC throttling support");
55
56 struct throttling_tstate {
57         unsigned int cpu;               /* cpu nr */
58         int target_state;               /* target T-state */
59 };
60
61 #define THROTTLING_PRECHANGE       (1)
62 #define THROTTLING_POSTCHANGE      (2)
63
64 static int acpi_processor_get_throttling(struct acpi_processor *pr);
65 int acpi_processor_set_throttling(struct acpi_processor *pr,
66                                                 int state, bool force);
67
68 static int acpi_processor_update_tsd_coord(void)
69 {
70         int count, count_target;
71         int retval = 0;
72         unsigned int i, j;
73         cpumask_var_t covered_cpus;
74         struct acpi_processor *pr, *match_pr;
75         struct acpi_tsd_package *pdomain, *match_pdomain;
76         struct acpi_processor_throttling *pthrottling, *match_pthrottling;
77
78         if (!alloc_cpumask_var(&covered_cpus, GFP_KERNEL))
79                 return -ENOMEM;
80
81         /*
82          * Now that we have _TSD data from all CPUs, lets setup T-state
83          * coordination between all CPUs.
84          */
85         for_each_possible_cpu(i) {
86                 pr = per_cpu(processors, i);
87                 if (!pr)
88                         continue;
89
90                 /* Basic validity check for domain info */
91                 pthrottling = &(pr->throttling);
92
93                 /*
94                  * If tsd package for one cpu is invalid, the coordination
95                  * among all CPUs is thought as invalid.
96                  * Maybe it is ugly.
97                  */
98                 if (!pthrottling->tsd_valid_flag) {
99                         retval = -EINVAL;
100                         break;
101                 }
102         }
103         if (retval)
104                 goto err_ret;
105
106         cpumask_clear(covered_cpus);
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  * _PTC - Processor Throttling Control (and status) register location
370  */
371 static int acpi_processor_get_throttling_control(struct acpi_processor *pr)
372 {
373         int result = 0;
374         acpi_status status = 0;
375         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
376         union acpi_object *ptc = NULL;
377         union acpi_object obj = { 0 };
378         struct acpi_processor_throttling *throttling;
379
380         status = acpi_evaluate_object(pr->handle, "_PTC", NULL, &buffer);
381         if (ACPI_FAILURE(status)) {
382                 if (status != AE_NOT_FOUND) {
383                         ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTC"));
384                 }
385                 return -ENODEV;
386         }
387
388         ptc = (union acpi_object *)buffer.pointer;
389         if (!ptc || (ptc->type != ACPI_TYPE_PACKAGE)
390             || (ptc->package.count != 2)) {
391                 printk(KERN_ERR PREFIX "Invalid _PTC data\n");
392                 result = -EFAULT;
393                 goto end;
394         }
395
396         /*
397          * control_register
398          */
399
400         obj = ptc->package.elements[0];
401
402         if ((obj.type != ACPI_TYPE_BUFFER)
403             || (obj.buffer.length < sizeof(struct acpi_ptc_register))
404             || (obj.buffer.pointer == NULL)) {
405                 printk(KERN_ERR PREFIX
406                        "Invalid _PTC data (control_register)\n");
407                 result = -EFAULT;
408                 goto end;
409         }
410         memcpy(&pr->throttling.control_register, obj.buffer.pointer,
411                sizeof(struct acpi_ptc_register));
412
413         /*
414          * status_register
415          */
416
417         obj = ptc->package.elements[1];
418
419         if ((obj.type != ACPI_TYPE_BUFFER)
420             || (obj.buffer.length < sizeof(struct acpi_ptc_register))
421             || (obj.buffer.pointer == NULL)) {
422                 printk(KERN_ERR PREFIX "Invalid _PTC data (status_register)\n");
423                 result = -EFAULT;
424                 goto end;
425         }
426
427         memcpy(&pr->throttling.status_register, obj.buffer.pointer,
428                sizeof(struct acpi_ptc_register));
429
430         throttling = &pr->throttling;
431
432         if ((throttling->control_register.bit_width +
433                 throttling->control_register.bit_offset) > 32) {
434                 printk(KERN_ERR PREFIX "Invalid _PTC control register\n");
435                 result = -EFAULT;
436                 goto end;
437         }
438
439         if ((throttling->status_register.bit_width +
440                 throttling->status_register.bit_offset) > 32) {
441                 printk(KERN_ERR PREFIX "Invalid _PTC status register\n");
442                 result = -EFAULT;
443                 goto end;
444         }
445
446       end:
447         kfree(buffer.pointer);
448
449         return result;
450 }
451
452 /*
453  * _TSS - Throttling Supported States
454  */
455 static int acpi_processor_get_throttling_states(struct acpi_processor *pr)
456 {
457         int result = 0;
458         acpi_status status = AE_OK;
459         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
460         struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" };
461         struct acpi_buffer state = { 0, NULL };
462         union acpi_object *tss = NULL;
463         int i;
464
465         status = acpi_evaluate_object(pr->handle, "_TSS", NULL, &buffer);
466         if (ACPI_FAILURE(status)) {
467                 if (status != AE_NOT_FOUND) {
468                         ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSS"));
469                 }
470                 return -ENODEV;
471         }
472
473         tss = buffer.pointer;
474         if (!tss || (tss->type != ACPI_TYPE_PACKAGE)) {
475                 printk(KERN_ERR PREFIX "Invalid _TSS data\n");
476                 result = -EFAULT;
477                 goto end;
478         }
479
480         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n",
481                           tss->package.count));
482
483         pr->throttling.state_count = tss->package.count;
484         pr->throttling.states_tss =
485             kmalloc(sizeof(struct acpi_processor_tx_tss) * tss->package.count,
486                     GFP_KERNEL);
487         if (!pr->throttling.states_tss) {
488                 result = -ENOMEM;
489                 goto end;
490         }
491
492         for (i = 0; i < pr->throttling.state_count; i++) {
493
494                 struct acpi_processor_tx_tss *tx =
495                     (struct acpi_processor_tx_tss *)&(pr->throttling.
496                                                       states_tss[i]);
497
498                 state.length = sizeof(struct acpi_processor_tx_tss);
499                 state.pointer = tx;
500
501                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
502
503                 status = acpi_extract_package(&(tss->package.elements[i]),
504                                               &format, &state);
505                 if (ACPI_FAILURE(status)) {
506                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _TSS data"));
507                         result = -EFAULT;
508                         kfree(pr->throttling.states_tss);
509                         goto end;
510                 }
511
512                 if (!tx->freqpercentage) {
513                         printk(KERN_ERR PREFIX
514                                "Invalid _TSS data: freq is zero\n");
515                         result = -EFAULT;
516                         kfree(pr->throttling.states_tss);
517                         goto end;
518                 }
519         }
520
521       end:
522         kfree(buffer.pointer);
523
524         return result;
525 }
526
527 /*
528  * _TSD - T-State Dependencies
529  */
530 static int acpi_processor_get_tsd(struct acpi_processor *pr)
531 {
532         int result = 0;
533         acpi_status status = AE_OK;
534         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
535         struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" };
536         struct acpi_buffer state = { 0, NULL };
537         union acpi_object *tsd = NULL;
538         struct acpi_tsd_package *pdomain;
539         struct acpi_processor_throttling *pthrottling;
540
541         pthrottling = &pr->throttling;
542         pthrottling->tsd_valid_flag = 0;
543
544         status = acpi_evaluate_object(pr->handle, "_TSD", NULL, &buffer);
545         if (ACPI_FAILURE(status)) {
546                 if (status != AE_NOT_FOUND) {
547                         ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSD"));
548                 }
549                 return -ENODEV;
550         }
551
552         tsd = buffer.pointer;
553         if (!tsd || (tsd->type != ACPI_TYPE_PACKAGE)) {
554                 printk(KERN_ERR PREFIX "Invalid _TSD data\n");
555                 result = -EFAULT;
556                 goto end;
557         }
558
559         if (tsd->package.count != 1) {
560                 printk(KERN_ERR PREFIX "Invalid _TSD data\n");
561                 result = -EFAULT;
562                 goto end;
563         }
564
565         pdomain = &(pr->throttling.domain_info);
566
567         state.length = sizeof(struct acpi_tsd_package);
568         state.pointer = pdomain;
569
570         status = acpi_extract_package(&(tsd->package.elements[0]),
571                                       &format, &state);
572         if (ACPI_FAILURE(status)) {
573                 printk(KERN_ERR PREFIX "Invalid _TSD data\n");
574                 result = -EFAULT;
575                 goto end;
576         }
577
578         if (pdomain->num_entries != ACPI_TSD_REV0_ENTRIES) {
579                 printk(KERN_ERR PREFIX "Unknown _TSD:num_entries\n");
580                 result = -EFAULT;
581                 goto end;
582         }
583
584         if (pdomain->revision != ACPI_TSD_REV0_REVISION) {
585                 printk(KERN_ERR PREFIX "Unknown _TSD:revision\n");
586                 result = -EFAULT;
587                 goto end;
588         }
589
590         pthrottling = &pr->throttling;
591         pthrottling->tsd_valid_flag = 1;
592         pthrottling->shared_type = pdomain->coord_type;
593         cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map);
594         /*
595          * If the coordination type is not defined in ACPI spec,
596          * the tsd_valid_flag will be clear and coordination type
597          * will be forecd as DOMAIN_COORD_TYPE_SW_ALL.
598          */
599         if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
600                 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
601                 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
602                 pthrottling->tsd_valid_flag = 0;
603                 pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL;
604         }
605
606       end:
607         kfree(buffer.pointer);
608         return result;
609 }
610
611 /* --------------------------------------------------------------------------
612                               Throttling Control
613    -------------------------------------------------------------------------- */
614 static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr)
615 {
616         int state = 0;
617         u32 value = 0;
618         u32 duty_mask = 0;
619         u32 duty_value = 0;
620
621         if (!pr)
622                 return -EINVAL;
623
624         if (!pr->flags.throttling)
625                 return -ENODEV;
626
627         pr->throttling.state = 0;
628
629         duty_mask = pr->throttling.state_count - 1;
630
631         duty_mask <<= pr->throttling.duty_offset;
632
633         local_irq_disable();
634
635         value = inl(pr->throttling.address);
636
637         /*
638          * Compute the current throttling state when throttling is enabled
639          * (bit 4 is on).
640          */
641         if (value & 0x10) {
642                 duty_value = value & duty_mask;
643                 duty_value >>= pr->throttling.duty_offset;
644
645                 if (duty_value)
646                         state = pr->throttling.state_count - duty_value;
647         }
648
649         pr->throttling.state = state;
650
651         local_irq_enable();
652
653         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
654                           "Throttling state is T%d (%d%% throttling applied)\n",
655                           state, pr->throttling.states[state].performance));
656
657         return 0;
658 }
659
660 #ifdef CONFIG_X86
661 static int acpi_throttling_rdmsr(struct acpi_processor *pr,
662                                         acpi_integer * value)
663 {
664         struct cpuinfo_x86 *c;
665         u64 msr_high, msr_low;
666         unsigned int cpu;
667         u64 msr = 0;
668         int ret = -1;
669
670         cpu = pr->id;
671         c = &cpu_data(cpu);
672
673         if ((c->x86_vendor != X86_VENDOR_INTEL) ||
674                 !cpu_has(c, X86_FEATURE_ACPI)) {
675                 printk(KERN_ERR PREFIX
676                         "HARDWARE addr space,NOT supported yet\n");
677         } else {
678                 msr_low = 0;
679                 msr_high = 0;
680                 rdmsr_safe(MSR_IA32_THERM_CONTROL,
681                         (u32 *)&msr_low , (u32 *) &msr_high);
682                 msr = (msr_high << 32) | msr_low;
683                 *value = (acpi_integer) msr;
684                 ret = 0;
685         }
686         return ret;
687 }
688
689 static int acpi_throttling_wrmsr(struct acpi_processor *pr, acpi_integer value)
690 {
691         struct cpuinfo_x86 *c;
692         unsigned int cpu;
693         int ret = -1;
694         u64 msr;
695
696         cpu = pr->id;
697         c = &cpu_data(cpu);
698
699         if ((c->x86_vendor != X86_VENDOR_INTEL) ||
700                 !cpu_has(c, X86_FEATURE_ACPI)) {
701                 printk(KERN_ERR PREFIX
702                         "HARDWARE addr space,NOT supported yet\n");
703         } else {
704                 msr = value;
705                 wrmsr_safe(MSR_IA32_THERM_CONTROL,
706                         msr & 0xffffffff, msr >> 32);
707                 ret = 0;
708         }
709         return ret;
710 }
711 #else
712 static int acpi_throttling_rdmsr(struct acpi_processor *pr,
713                                 acpi_integer * value)
714 {
715         printk(KERN_ERR PREFIX
716                 "HARDWARE addr space,NOT supported yet\n");
717         return -1;
718 }
719
720 static int acpi_throttling_wrmsr(struct acpi_processor *pr, acpi_integer value)
721 {
722         printk(KERN_ERR PREFIX
723                 "HARDWARE addr space,NOT supported yet\n");
724         return -1;
725 }
726 #endif
727
728 static int acpi_read_throttling_status(struct acpi_processor *pr,
729                                         acpi_integer *value)
730 {
731         u32 bit_width, bit_offset;
732         u64 ptc_value;
733         u64 ptc_mask;
734         struct acpi_processor_throttling *throttling;
735         int ret = -1;
736
737         throttling = &pr->throttling;
738         switch (throttling->status_register.space_id) {
739         case ACPI_ADR_SPACE_SYSTEM_IO:
740                 ptc_value = 0;
741                 bit_width = throttling->status_register.bit_width;
742                 bit_offset = throttling->status_register.bit_offset;
743
744                 acpi_os_read_port((acpi_io_address) throttling->status_register.
745                                   address, (u32 *) &ptc_value,
746                                   (u32) (bit_width + bit_offset));
747                 ptc_mask = (1 << bit_width) - 1;
748                 *value = (acpi_integer) ((ptc_value >> bit_offset) & ptc_mask);
749                 ret = 0;
750                 break;
751         case ACPI_ADR_SPACE_FIXED_HARDWARE:
752                 ret = acpi_throttling_rdmsr(pr, value);
753                 break;
754         default:
755                 printk(KERN_ERR PREFIX "Unknown addr space %d\n",
756                        (u32) (throttling->status_register.space_id));
757         }
758         return ret;
759 }
760
761 static int acpi_write_throttling_state(struct acpi_processor *pr,
762                                 acpi_integer value)
763 {
764         u32 bit_width, bit_offset;
765         u64 ptc_value;
766         u64 ptc_mask;
767         struct acpi_processor_throttling *throttling;
768         int ret = -1;
769
770         throttling = &pr->throttling;
771         switch (throttling->control_register.space_id) {
772         case ACPI_ADR_SPACE_SYSTEM_IO:
773                 bit_width = throttling->control_register.bit_width;
774                 bit_offset = throttling->control_register.bit_offset;
775                 ptc_mask = (1 << bit_width) - 1;
776                 ptc_value = value & ptc_mask;
777
778                 acpi_os_write_port((acpi_io_address) throttling->
779                                         control_register.address,
780                                         (u32) (ptc_value << bit_offset),
781                                         (u32) (bit_width + bit_offset));
782                 ret = 0;
783                 break;
784         case ACPI_ADR_SPACE_FIXED_HARDWARE:
785                 ret = acpi_throttling_wrmsr(pr, value);
786                 break;
787         default:
788                 printk(KERN_ERR PREFIX "Unknown addr space %d\n",
789                        (u32) (throttling->control_register.space_id));
790         }
791         return ret;
792 }
793
794 static int acpi_get_throttling_state(struct acpi_processor *pr,
795                                 acpi_integer value)
796 {
797         int i;
798
799         for (i = 0; i < pr->throttling.state_count; i++) {
800                 struct acpi_processor_tx_tss *tx =
801                     (struct acpi_processor_tx_tss *)&(pr->throttling.
802                                                       states_tss[i]);
803                 if (tx->control == value)
804                         return i;
805         }
806         return -1;
807 }
808
809 static int acpi_get_throttling_value(struct acpi_processor *pr,
810                         int state, acpi_integer *value)
811 {
812         int ret = -1;
813
814         if (state >= 0 && state <= pr->throttling.state_count) {
815                 struct acpi_processor_tx_tss *tx =
816                     (struct acpi_processor_tx_tss *)&(pr->throttling.
817                                                       states_tss[state]);
818                 *value = tx->control;
819                 ret = 0;
820         }
821         return ret;
822 }
823
824 static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr)
825 {
826         int state = 0;
827         int ret;
828         acpi_integer value;
829
830         if (!pr)
831                 return -EINVAL;
832
833         if (!pr->flags.throttling)
834                 return -ENODEV;
835
836         pr->throttling.state = 0;
837
838         value = 0;
839         ret = acpi_read_throttling_status(pr, &value);
840         if (ret >= 0) {
841                 state = acpi_get_throttling_state(pr, value);
842                 if (state == -1) {
843                         ACPI_WARNING((AE_INFO,
844                                 "Invalid throttling state, reset"));
845                         state = 0;
846                         ret = acpi_processor_set_throttling(pr, state, true);
847                         if (ret)
848                                 return ret;
849                 }
850                 pr->throttling.state = state;
851         }
852
853         return 0;
854 }
855
856 static int acpi_processor_get_throttling(struct acpi_processor *pr)
857 {
858         cpumask_var_t saved_mask;
859         int ret;
860
861         if (!pr)
862                 return -EINVAL;
863
864         if (!pr->flags.throttling)
865                 return -ENODEV;
866
867         if (!alloc_cpumask_var(&saved_mask, GFP_KERNEL))
868                 return -ENOMEM;
869
870         /*
871          * Migrate task to the cpu pointed by pr.
872          */
873         cpumask_copy(saved_mask, &current->cpus_allowed);
874         /* FIXME: use work_on_cpu() */
875         set_cpus_allowed_ptr(current, cpumask_of(pr->id));
876         ret = pr->throttling.acpi_processor_get_throttling(pr);
877         /* restore the previous state */
878         set_cpus_allowed_ptr(current, saved_mask);
879         free_cpumask_var(saved_mask);
880
881         return ret;
882 }
883
884 static int acpi_processor_get_fadt_info(struct acpi_processor *pr)
885 {
886         int i, step;
887
888         if (!pr->throttling.address) {
889                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n"));
890                 return -EINVAL;
891         } else if (!pr->throttling.duty_width) {
892                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling states\n"));
893                 return -EINVAL;
894         }
895         /* TBD: Support duty_cycle values that span bit 4. */
896         else if ((pr->throttling.duty_offset + pr->throttling.duty_width) > 4) {
897                 printk(KERN_WARNING PREFIX "duty_cycle spans bit 4\n");
898                 return -EINVAL;
899         }
900
901         pr->throttling.state_count = 1 << acpi_gbl_FADT.duty_width;
902
903         /*
904          * Compute state values. Note that throttling displays a linear power
905          * performance relationship (at 50% performance the CPU will consume
906          * 50% power).  Values are in 1/10th of a percent to preserve accuracy.
907          */
908
909         step = (1000 / pr->throttling.state_count);
910
911         for (i = 0; i < pr->throttling.state_count; i++) {
912                 pr->throttling.states[i].performance = 1000 - step * i;
913                 pr->throttling.states[i].power = 1000 - step * i;
914         }
915         return 0;
916 }
917
918 static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr,
919                                               int state, bool force)
920 {
921         u32 value = 0;
922         u32 duty_mask = 0;
923         u32 duty_value = 0;
924
925         if (!pr)
926                 return -EINVAL;
927
928         if ((state < 0) || (state > (pr->throttling.state_count - 1)))
929                 return -EINVAL;
930
931         if (!pr->flags.throttling)
932                 return -ENODEV;
933
934         if (!force && (state == pr->throttling.state))
935                 return 0;
936
937         if (state < pr->throttling_platform_limit)
938                 return -EPERM;
939         /*
940          * Calculate the duty_value and duty_mask.
941          */
942         if (state) {
943                 duty_value = pr->throttling.state_count - state;
944
945                 duty_value <<= pr->throttling.duty_offset;
946
947                 /* Used to clear all duty_value bits */
948                 duty_mask = pr->throttling.state_count - 1;
949
950                 duty_mask <<= acpi_gbl_FADT.duty_offset;
951                 duty_mask = ~duty_mask;
952         }
953
954         local_irq_disable();
955
956         /*
957          * Disable throttling by writing a 0 to bit 4.  Note that we must
958          * turn it off before you can change the duty_value.
959          */
960         value = inl(pr->throttling.address);
961         if (value & 0x10) {
962                 value &= 0xFFFFFFEF;
963                 outl(value, pr->throttling.address);
964         }
965
966         /*
967          * Write the new duty_value and then enable throttling.  Note
968          * that a state value of 0 leaves throttling disabled.
969          */
970         if (state) {
971                 value &= duty_mask;
972                 value |= duty_value;
973                 outl(value, pr->throttling.address);
974
975                 value |= 0x00000010;
976                 outl(value, pr->throttling.address);
977         }
978
979         pr->throttling.state = state;
980
981         local_irq_enable();
982
983         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
984                           "Throttling state set to T%d (%d%%)\n", state,
985                           (pr->throttling.states[state].performance ? pr->
986                            throttling.states[state].performance / 10 : 0)));
987
988         return 0;
989 }
990
991 static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr,
992                                              int state, bool force)
993 {
994         int ret;
995         acpi_integer value;
996
997         if (!pr)
998                 return -EINVAL;
999
1000         if ((state < 0) || (state > (pr->throttling.state_count - 1)))
1001                 return -EINVAL;
1002
1003         if (!pr->flags.throttling)
1004                 return -ENODEV;
1005
1006         if (!force && (state == pr->throttling.state))
1007                 return 0;
1008
1009         if (state < pr->throttling_platform_limit)
1010                 return -EPERM;
1011
1012         value = 0;
1013         ret = acpi_get_throttling_value(pr, state, &value);
1014         if (ret >= 0) {
1015                 acpi_write_throttling_state(pr, value);
1016                 pr->throttling.state = state;
1017         }
1018
1019         return 0;
1020 }
1021
1022 int acpi_processor_set_throttling(struct acpi_processor *pr,
1023                                                 int state, bool force)
1024 {
1025         cpumask_var_t saved_mask;
1026         int ret = 0;
1027         unsigned int i;
1028         struct acpi_processor *match_pr;
1029         struct acpi_processor_throttling *p_throttling;
1030         struct throttling_tstate t_state;
1031         cpumask_var_t online_throttling_cpus;
1032
1033         if (!pr)
1034                 return -EINVAL;
1035
1036         if (!pr->flags.throttling)
1037                 return -ENODEV;
1038
1039         if ((state < 0) || (state > (pr->throttling.state_count - 1)))
1040                 return -EINVAL;
1041
1042         if (!alloc_cpumask_var(&saved_mask, GFP_KERNEL))
1043                 return -ENOMEM;
1044
1045         if (!alloc_cpumask_var(&online_throttling_cpus, GFP_KERNEL)) {
1046                 free_cpumask_var(saved_mask);
1047                 return -ENOMEM;
1048         }
1049
1050         cpumask_copy(saved_mask, &current->cpus_allowed);
1051         t_state.target_state = state;
1052         p_throttling = &(pr->throttling);
1053         cpumask_and(online_throttling_cpus, cpu_online_mask,
1054                     p_throttling->shared_cpu_map);
1055         /*
1056          * The throttling notifier will be called for every
1057          * affected cpu in order to get one proper T-state.
1058          * The notifier event is THROTTLING_PRECHANGE.
1059          */
1060         for_each_cpu(i, online_throttling_cpus) {
1061                 t_state.cpu = i;
1062                 acpi_processor_throttling_notifier(THROTTLING_PRECHANGE,
1063                                                         &t_state);
1064         }
1065         /*
1066          * The function of acpi_processor_set_throttling will be called
1067          * to switch T-state. If the coordination type is SW_ALL or HW_ALL,
1068          * it is necessary to call it for every affected cpu. Otherwise
1069          * it can be called only for the cpu pointed by pr.
1070          */
1071         if (p_throttling->shared_type == DOMAIN_COORD_TYPE_SW_ANY) {
1072                 /* FIXME: use work_on_cpu() */
1073                 set_cpus_allowed_ptr(current, cpumask_of(pr->id));
1074                 ret = p_throttling->acpi_processor_set_throttling(pr,
1075                                                 t_state.target_state, force);
1076         } else {
1077                 /*
1078                  * When the T-state coordination is SW_ALL or HW_ALL,
1079                  * it is necessary to set T-state for every affected
1080                  * cpus.
1081                  */
1082                 for_each_cpu(i, online_throttling_cpus) {
1083                         match_pr = per_cpu(processors, i);
1084                         /*
1085                          * If the pointer is invalid, we will report the
1086                          * error message and continue.
1087                          */
1088                         if (!match_pr) {
1089                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1090                                         "Invalid Pointer for CPU %d\n", i));
1091                                 continue;
1092                         }
1093                         /*
1094                          * If the throttling control is unsupported on CPU i,
1095                          * we will report the error message and continue.
1096                          */
1097                         if (!match_pr->flags.throttling) {
1098                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1099                                         "Throttling Controll is unsupported "
1100                                         "on CPU %d\n", i));
1101                                 continue;
1102                         }
1103                         t_state.cpu = i;
1104                         /* FIXME: use work_on_cpu() */
1105                         set_cpus_allowed_ptr(current, cpumask_of(i));
1106                         ret = match_pr->throttling.
1107                                 acpi_processor_set_throttling(
1108                                 match_pr, t_state.target_state, force);
1109                 }
1110         }
1111         /*
1112          * After the set_throttling is called, the
1113          * throttling notifier is called for every
1114          * affected cpu to update the T-states.
1115          * The notifier event is THROTTLING_POSTCHANGE
1116          */
1117         for_each_cpu(i, online_throttling_cpus) {
1118                 t_state.cpu = i;
1119                 acpi_processor_throttling_notifier(THROTTLING_POSTCHANGE,
1120                                                         &t_state);
1121         }
1122         /* restore the previous state */
1123         /* FIXME: use work_on_cpu() */
1124         set_cpus_allowed_ptr(current, saved_mask);
1125         free_cpumask_var(online_throttling_cpus);
1126         free_cpumask_var(saved_mask);
1127         return ret;
1128 }
1129
1130 int acpi_processor_get_throttling_info(struct acpi_processor *pr)
1131 {
1132         int result = 0;
1133         struct acpi_processor_throttling *pthrottling;
1134
1135         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1136                           "pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n",
1137                           pr->throttling.address,
1138                           pr->throttling.duty_offset,
1139                           pr->throttling.duty_width));
1140
1141         if (!pr)
1142                 return -EINVAL;
1143
1144         /*
1145          * Evaluate _PTC, _TSS and _TPC
1146          * They must all be present or none of them can be used.
1147          */
1148         if (acpi_processor_get_throttling_control(pr) ||
1149                 acpi_processor_get_throttling_states(pr) ||
1150                 acpi_processor_get_platform_limit(pr))
1151         {
1152                 pr->throttling.acpi_processor_get_throttling =
1153                     &acpi_processor_get_throttling_fadt;
1154                 pr->throttling.acpi_processor_set_throttling =
1155                     &acpi_processor_set_throttling_fadt;
1156                 if (acpi_processor_get_fadt_info(pr))
1157                         return 0;
1158         } else {
1159                 pr->throttling.acpi_processor_get_throttling =
1160                     &acpi_processor_get_throttling_ptc;
1161                 pr->throttling.acpi_processor_set_throttling =
1162                     &acpi_processor_set_throttling_ptc;
1163         }
1164
1165         /*
1166          * If TSD package for one CPU can't be parsed successfully, it means
1167          * that this CPU will have no coordination with other CPUs.
1168          */
1169         if (acpi_processor_get_tsd(pr)) {
1170                 pthrottling = &pr->throttling;
1171                 pthrottling->tsd_valid_flag = 0;
1172                 cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map);
1173                 pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL;
1174         }
1175
1176         /*
1177          * PIIX4 Errata: We don't support throttling on the original PIIX4.
1178          * This shouldn't be an issue as few (if any) mobile systems ever
1179          * used this part.
1180          */
1181         if (errata.piix4.throttle) {
1182                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1183                                   "Throttling not supported on PIIX4 A- or B-step\n"));
1184                 return 0;
1185         }
1186
1187         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n",
1188                           pr->throttling.state_count));
1189
1190         pr->flags.throttling = 1;
1191
1192         /*
1193          * Disable throttling (if enabled).  We'll let subsequent policy (e.g.
1194          * thermal) decide to lower performance if it so chooses, but for now
1195          * we'll crank up the speed.
1196          */
1197
1198         result = acpi_processor_get_throttling(pr);
1199         if (result)
1200                 goto end;
1201
1202         if (pr->throttling.state) {
1203                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1204                                   "Disabling throttling (was T%d)\n",
1205                                   pr->throttling.state));
1206                 result = acpi_processor_set_throttling(pr, 0, false);
1207                 if (result)
1208                         goto end;
1209         }
1210
1211       end:
1212         if (result)
1213                 pr->flags.throttling = 0;
1214
1215         return result;
1216 }
1217
1218 /* proc interface */
1219
1220 static int acpi_processor_throttling_seq_show(struct seq_file *seq,
1221                                               void *offset)
1222 {
1223         struct acpi_processor *pr = seq->private;
1224         int i = 0;
1225         int result = 0;
1226
1227         if (!pr)
1228                 goto end;
1229
1230         if (!(pr->throttling.state_count > 0)) {
1231                 seq_puts(seq, "<not supported>\n");
1232                 goto end;
1233         }
1234
1235         result = acpi_processor_get_throttling(pr);
1236
1237         if (result) {
1238                 seq_puts(seq,
1239                          "Could not determine current throttling state.\n");
1240                 goto end;
1241         }
1242
1243         seq_printf(seq, "state count:             %d\n"
1244                    "active state:            T%d\n"
1245                    "state available: T%d to T%d\n",
1246                    pr->throttling.state_count, pr->throttling.state,
1247                    pr->throttling_platform_limit,
1248                    pr->throttling.state_count - 1);
1249
1250         seq_puts(seq, "states:\n");
1251         if (pr->throttling.acpi_processor_get_throttling ==
1252                         acpi_processor_get_throttling_fadt) {
1253                 for (i = 0; i < pr->throttling.state_count; i++)
1254                         seq_printf(seq, "   %cT%d:                  %02d%%\n",
1255                                    (i == pr->throttling.state ? '*' : ' '), i,
1256                                    (pr->throttling.states[i].performance ? pr->
1257                                     throttling.states[i].performance / 10 : 0));
1258         } else {
1259                 for (i = 0; i < pr->throttling.state_count; i++)
1260                         seq_printf(seq, "   %cT%d:                  %02d%%\n",
1261                                    (i == pr->throttling.state ? '*' : ' '), i,
1262                                    (int)pr->throttling.states_tss[i].
1263                                    freqpercentage);
1264         }
1265
1266       end:
1267         return 0;
1268 }
1269
1270 static int acpi_processor_throttling_open_fs(struct inode *inode,
1271                                              struct file *file)
1272 {
1273         return single_open(file, acpi_processor_throttling_seq_show,
1274                            PDE(inode)->data);
1275 }
1276
1277 static ssize_t acpi_processor_write_throttling(struct file *file,
1278                                                const char __user * buffer,
1279                                                size_t count, loff_t * data)
1280 {
1281         int result = 0;
1282         struct seq_file *m = file->private_data;
1283         struct acpi_processor *pr = m->private;
1284         char state_string[5] = "";
1285         char *charp = NULL;
1286         size_t state_val = 0;
1287         char tmpbuf[5] = "";
1288
1289         if (!pr || (count > sizeof(state_string) - 1))
1290                 return -EINVAL;
1291
1292         if (copy_from_user(state_string, buffer, count))
1293                 return -EFAULT;
1294
1295         state_string[count] = '\0';
1296         if ((count > 0) && (state_string[count-1] == '\n'))
1297                 state_string[count-1] = '\0';
1298
1299         charp = state_string;
1300         if ((state_string[0] == 't') || (state_string[0] == 'T'))
1301                 charp++;
1302
1303         state_val = simple_strtoul(charp, NULL, 0);
1304         if (state_val >= pr->throttling.state_count)
1305                 return -EINVAL;
1306
1307         snprintf(tmpbuf, 5, "%zu", state_val);
1308
1309         if (strcmp(tmpbuf, charp) != 0)
1310                 return -EINVAL;
1311
1312         result = acpi_processor_set_throttling(pr, state_val, false);
1313         if (result)
1314                 return result;
1315
1316         return count;
1317 }
1318
1319 const struct file_operations acpi_processor_throttling_fops = {
1320         .owner = THIS_MODULE,
1321         .open = acpi_processor_throttling_open_fs,
1322         .read = seq_read,
1323         .write = acpi_processor_write_throttling,
1324         .llseek = seq_lseek,
1325         .release = single_release,
1326 };