cpumask: use zalloc_cpumask_var() where possible
[linux-2.6.git] / drivers / acpi / processor_throttling.c
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 PREFIX "ACPI: "
45
46 #define ACPI_PROCESSOR_CLASS            "processor"
47 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
48 ACPI_MODULE_NAME("processor_throttling");
49
50 /* ignore_tpc:
51  *  0 -> acpi processor driver doesn't ignore _TPC values
52  *  1 -> acpi processor driver ignores _TPC values
53  */
54 static int ignore_tpc;
55 module_param(ignore_tpc, int, 0644);
56 MODULE_PARM_DESC(ignore_tpc, "Disable broken BIOS _TPC throttling support");
57
58 struct throttling_tstate {
59         unsigned int cpu;               /* cpu nr */
60         int target_state;               /* target T-state */
61 };
62
63 #define THROTTLING_PRECHANGE       (1)
64 #define THROTTLING_POSTCHANGE      (2)
65
66 static int acpi_processor_get_throttling(struct acpi_processor *pr);
67 int acpi_processor_set_throttling(struct acpi_processor *pr,
68                                                 int state, bool force);
69
70 static int acpi_processor_update_tsd_coord(void)
71 {
72         int count, count_target;
73         int retval = 0;
74         unsigned int i, j;
75         cpumask_var_t covered_cpus;
76         struct acpi_processor *pr, *match_pr;
77         struct acpi_tsd_package *pdomain, *match_pdomain;
78         struct acpi_processor_throttling *pthrottling, *match_pthrottling;
79
80         if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
81                 return -ENOMEM;
82
83         /*
84          * Now that we have _TSD data from all CPUs, lets setup T-state
85          * coordination between all CPUs.
86          */
87         for_each_possible_cpu(i) {
88                 pr = per_cpu(processors, i);
89                 if (!pr)
90                         continue;
91
92                 /* Basic validity check for domain info */
93                 pthrottling = &(pr->throttling);
94
95                 /*
96                  * If tsd package for one cpu is invalid, the coordination
97                  * among all CPUs is thought as invalid.
98                  * Maybe it is ugly.
99                  */
100                 if (!pthrottling->tsd_valid_flag) {
101                         retval = -EINVAL;
102                         break;
103                 }
104         }
105         if (retval)
106                 goto err_ret;
107
108         for_each_possible_cpu(i) {
109                 pr = per_cpu(processors, i);
110                 if (!pr)
111                         continue;
112
113                 if (cpumask_test_cpu(i, covered_cpus))
114                         continue;
115                 pthrottling = &pr->throttling;
116
117                 pdomain = &(pthrottling->domain_info);
118                 cpumask_set_cpu(i, pthrottling->shared_cpu_map);
119                 cpumask_set_cpu(i, covered_cpus);
120                 /*
121                  * If the number of processor in the TSD domain is 1, it is
122                  * unnecessary to parse the coordination for this CPU.
123                  */
124                 if (pdomain->num_processors <= 1)
125                         continue;
126
127                 /* Validate the Domain info */
128                 count_target = pdomain->num_processors;
129                 count = 1;
130
131                 for_each_possible_cpu(j) {
132                         if (i == j)
133                                 continue;
134
135                         match_pr = per_cpu(processors, j);
136                         if (!match_pr)
137                                 continue;
138
139                         match_pthrottling = &(match_pr->throttling);
140                         match_pdomain = &(match_pthrottling->domain_info);
141                         if (match_pdomain->domain != pdomain->domain)
142                                 continue;
143
144                         /* Here i and j are in the same domain.
145                          * If two TSD packages have the same domain, they
146                          * should have the same num_porcessors and
147                          * coordination type. Otherwise it will be regarded
148                          * as illegal.
149                          */
150                         if (match_pdomain->num_processors != count_target) {
151                                 retval = -EINVAL;
152                                 goto err_ret;
153                         }
154
155                         if (pdomain->coord_type != match_pdomain->coord_type) {
156                                 retval = -EINVAL;
157                                 goto err_ret;
158                         }
159
160                         cpumask_set_cpu(j, covered_cpus);
161                         cpumask_set_cpu(j, pthrottling->shared_cpu_map);
162                         count++;
163                 }
164                 for_each_possible_cpu(j) {
165                         if (i == j)
166                                 continue;
167
168                         match_pr = per_cpu(processors, j);
169                         if (!match_pr)
170                                 continue;
171
172                         match_pthrottling = &(match_pr->throttling);
173                         match_pdomain = &(match_pthrottling->domain_info);
174                         if (match_pdomain->domain != pdomain->domain)
175                                 continue;
176
177                         /*
178                          * If some CPUS have the same domain, they
179                          * will have the same shared_cpu_map.
180                          */
181                         cpumask_copy(match_pthrottling->shared_cpu_map,
182                                      pthrottling->shared_cpu_map);
183                 }
184         }
185
186 err_ret:
187         free_cpumask_var(covered_cpus);
188
189         for_each_possible_cpu(i) {
190                 pr = per_cpu(processors, i);
191                 if (!pr)
192                         continue;
193
194                 /*
195                  * Assume no coordination on any error parsing domain info.
196                  * The coordination type will be forced as SW_ALL.
197                  */
198                 if (retval) {
199                         pthrottling = &(pr->throttling);
200                         cpumask_clear(pthrottling->shared_cpu_map);
201                         cpumask_set_cpu(i, pthrottling->shared_cpu_map);
202                         pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL;
203                 }
204         }
205
206         return retval;
207 }
208
209 /*
210  * Update the T-state coordination after the _TSD
211  * data for all cpus is obtained.
212  */
213 void acpi_processor_throttling_init(void)
214 {
215         if (acpi_processor_update_tsd_coord())
216                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
217                         "Assume no T-state coordination\n"));
218
219         return;
220 }
221
222 static int acpi_processor_throttling_notifier(unsigned long event, void *data)
223 {
224         struct throttling_tstate *p_tstate = data;
225         struct acpi_processor *pr;
226         unsigned int cpu ;
227         int target_state;
228         struct acpi_processor_limit *p_limit;
229         struct acpi_processor_throttling *p_throttling;
230
231         cpu = p_tstate->cpu;
232         pr = per_cpu(processors, cpu);
233         if (!pr) {
234                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Invalid pr pointer\n"));
235                 return 0;
236         }
237         if (!pr->flags.throttling) {
238                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Throttling control is "
239                                 "unsupported on CPU %d\n", cpu));
240                 return 0;
241         }
242         target_state = p_tstate->target_state;
243         p_throttling = &(pr->throttling);
244         switch (event) {
245         case THROTTLING_PRECHANGE:
246                 /*
247                  * Prechange event is used to choose one proper t-state,
248                  * which meets the limits of thermal, user and _TPC.
249                  */
250                 p_limit = &pr->limit;
251                 if (p_limit->thermal.tx > target_state)
252                         target_state = p_limit->thermal.tx;
253                 if (p_limit->user.tx > target_state)
254                         target_state = p_limit->user.tx;
255                 if (pr->throttling_platform_limit > target_state)
256                         target_state = pr->throttling_platform_limit;
257                 if (target_state >= p_throttling->state_count) {
258                         printk(KERN_WARNING
259                                 "Exceed the limit of T-state \n");
260                         target_state = p_throttling->state_count - 1;
261                 }
262                 p_tstate->target_state = target_state;
263                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PreChange Event:"
264                                 "target T-state of CPU %d is T%d\n",
265                                 cpu, target_state));
266                 break;
267         case THROTTLING_POSTCHANGE:
268                 /*
269                  * Postchange event is only used to update the
270                  * T-state flag of acpi_processor_throttling.
271                  */
272                 p_throttling->state = target_state;
273                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PostChange Event:"
274                                 "CPU %d is switched to T%d\n",
275                                 cpu, target_state));
276                 break;
277         default:
278                 printk(KERN_WARNING
279                         "Unsupported Throttling notifier event\n");
280                 break;
281         }
282
283         return 0;
284 }
285
286 /*
287  * _TPC - Throttling Present Capabilities
288  */
289 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
290 {
291         acpi_status status = 0;
292         unsigned long long tpc = 0;
293
294         if (!pr)
295                 return -EINVAL;
296
297         if (ignore_tpc)
298                 goto end;
299
300         status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc);
301         if (ACPI_FAILURE(status)) {
302                 if (status != AE_NOT_FOUND) {
303                         ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TPC"));
304                 }
305                 return -ENODEV;
306         }
307
308 end:
309         pr->throttling_platform_limit = (int)tpc;
310         return 0;
311 }
312
313 int acpi_processor_tstate_has_changed(struct acpi_processor *pr)
314 {
315         int result = 0;
316         int throttling_limit;
317         int current_state;
318         struct acpi_processor_limit *limit;
319         int target_state;
320
321         if (ignore_tpc)
322                 return 0;
323
324         result = acpi_processor_get_platform_limit(pr);
325         if (result) {
326                 /* Throttling Limit is unsupported */
327                 return result;
328         }
329
330         throttling_limit = pr->throttling_platform_limit;
331         if (throttling_limit >= pr->throttling.state_count) {
332                 /* Uncorrect Throttling Limit */
333                 return -EINVAL;
334         }
335
336         current_state = pr->throttling.state;
337         if (current_state > throttling_limit) {
338                 /*
339                  * The current state can meet the requirement of
340                  * _TPC limit. But it is reasonable that OSPM changes
341                  * t-states from high to low for better performance.
342                  * Of course the limit condition of thermal
343                  * and user should be considered.
344                  */
345                 limit = &pr->limit;
346                 target_state = throttling_limit;
347                 if (limit->thermal.tx > target_state)
348                         target_state = limit->thermal.tx;
349                 if (limit->user.tx > target_state)
350                         target_state = limit->user.tx;
351         } else if (current_state == throttling_limit) {
352                 /*
353                  * Unnecessary to change the throttling state
354                  */
355                 return 0;
356         } else {
357                 /*
358                  * If the current state is lower than the limit of _TPC, it
359                  * will be forced to switch to the throttling state defined
360                  * by throttling_platfor_limit.
361                  * Because the previous state meets with the limit condition
362                  * of thermal and user, it is unnecessary to check it again.
363                  */
364                 target_state = throttling_limit;
365         }
366         return acpi_processor_set_throttling(pr, target_state, false);
367 }
368
369 /*
370  * _PTC - Processor Throttling Control (and status) register location
371  */
372 static int acpi_processor_get_throttling_control(struct acpi_processor *pr)
373 {
374         int result = 0;
375         acpi_status status = 0;
376         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
377         union acpi_object *ptc = NULL;
378         union acpi_object obj = { 0 };
379         struct acpi_processor_throttling *throttling;
380
381         status = acpi_evaluate_object(pr->handle, "_PTC", NULL, &buffer);
382         if (ACPI_FAILURE(status)) {
383                 if (status != AE_NOT_FOUND) {
384                         ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTC"));
385                 }
386                 return -ENODEV;
387         }
388
389         ptc = (union acpi_object *)buffer.pointer;
390         if (!ptc || (ptc->type != ACPI_TYPE_PACKAGE)
391             || (ptc->package.count != 2)) {
392                 printk(KERN_ERR PREFIX "Invalid _PTC data\n");
393                 result = -EFAULT;
394                 goto end;
395         }
396
397         /*
398          * control_register
399          */
400
401         obj = ptc->package.elements[0];
402
403         if ((obj.type != ACPI_TYPE_BUFFER)
404             || (obj.buffer.length < sizeof(struct acpi_ptc_register))
405             || (obj.buffer.pointer == NULL)) {
406                 printk(KERN_ERR PREFIX
407                        "Invalid _PTC data (control_register)\n");
408                 result = -EFAULT;
409                 goto end;
410         }
411         memcpy(&pr->throttling.control_register, obj.buffer.pointer,
412                sizeof(struct acpi_ptc_register));
413
414         /*
415          * status_register
416          */
417
418         obj = ptc->package.elements[1];
419
420         if ((obj.type != ACPI_TYPE_BUFFER)
421             || (obj.buffer.length < sizeof(struct acpi_ptc_register))
422             || (obj.buffer.pointer == NULL)) {
423                 printk(KERN_ERR PREFIX "Invalid _PTC data (status_register)\n");
424                 result = -EFAULT;
425                 goto end;
426         }
427
428         memcpy(&pr->throttling.status_register, obj.buffer.pointer,
429                sizeof(struct acpi_ptc_register));
430
431         throttling = &pr->throttling;
432
433         if ((throttling->control_register.bit_width +
434                 throttling->control_register.bit_offset) > 32) {
435                 printk(KERN_ERR PREFIX "Invalid _PTC control register\n");
436                 result = -EFAULT;
437                 goto end;
438         }
439
440         if ((throttling->status_register.bit_width +
441                 throttling->status_register.bit_offset) > 32) {
442                 printk(KERN_ERR PREFIX "Invalid _PTC status register\n");
443                 result = -EFAULT;
444                 goto end;
445         }
446
447       end:
448         kfree(buffer.pointer);
449
450         return result;
451 }
452
453 /*
454  * _TSS - Throttling Supported States
455  */
456 static int acpi_processor_get_throttling_states(struct acpi_processor *pr)
457 {
458         int result = 0;
459         acpi_status status = AE_OK;
460         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
461         struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" };
462         struct acpi_buffer state = { 0, NULL };
463         union acpi_object *tss = NULL;
464         int i;
465
466         status = acpi_evaluate_object(pr->handle, "_TSS", NULL, &buffer);
467         if (ACPI_FAILURE(status)) {
468                 if (status != AE_NOT_FOUND) {
469                         ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSS"));
470                 }
471                 return -ENODEV;
472         }
473
474         tss = buffer.pointer;
475         if (!tss || (tss->type != ACPI_TYPE_PACKAGE)) {
476                 printk(KERN_ERR PREFIX "Invalid _TSS data\n");
477                 result = -EFAULT;
478                 goto end;
479         }
480
481         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n",
482                           tss->package.count));
483
484         pr->throttling.state_count = tss->package.count;
485         pr->throttling.states_tss =
486             kmalloc(sizeof(struct acpi_processor_tx_tss) * tss->package.count,
487                     GFP_KERNEL);
488         if (!pr->throttling.states_tss) {
489                 result = -ENOMEM;
490                 goto end;
491         }
492
493         for (i = 0; i < pr->throttling.state_count; i++) {
494
495                 struct acpi_processor_tx_tss *tx =
496                     (struct acpi_processor_tx_tss *)&(pr->throttling.
497                                                       states_tss[i]);
498
499                 state.length = sizeof(struct acpi_processor_tx_tss);
500                 state.pointer = tx;
501
502                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
503
504                 status = acpi_extract_package(&(tss->package.elements[i]),
505                                               &format, &state);
506                 if (ACPI_FAILURE(status)) {
507                         ACPI_EXCEPTION((AE_INFO, status, "Invalid _TSS data"));
508                         result = -EFAULT;
509                         kfree(pr->throttling.states_tss);
510                         goto end;
511                 }
512
513                 if (!tx->freqpercentage) {
514                         printk(KERN_ERR PREFIX
515                                "Invalid _TSS data: freq is zero\n");
516                         result = -EFAULT;
517                         kfree(pr->throttling.states_tss);
518                         goto end;
519                 }
520         }
521
522       end:
523         kfree(buffer.pointer);
524
525         return result;
526 }
527
528 /*
529  * _TSD - T-State Dependencies
530  */
531 static int acpi_processor_get_tsd(struct acpi_processor *pr)
532 {
533         int result = 0;
534         acpi_status status = AE_OK;
535         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
536         struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" };
537         struct acpi_buffer state = { 0, NULL };
538         union acpi_object *tsd = NULL;
539         struct acpi_tsd_package *pdomain;
540         struct acpi_processor_throttling *pthrottling;
541
542         pthrottling = &pr->throttling;
543         pthrottling->tsd_valid_flag = 0;
544
545         status = acpi_evaluate_object(pr->handle, "_TSD", NULL, &buffer);
546         if (ACPI_FAILURE(status)) {
547                 if (status != AE_NOT_FOUND) {
548                         ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSD"));
549                 }
550                 return -ENODEV;
551         }
552
553         tsd = buffer.pointer;
554         if (!tsd || (tsd->type != ACPI_TYPE_PACKAGE)) {
555                 printk(KERN_ERR PREFIX "Invalid _TSD data\n");
556                 result = -EFAULT;
557                 goto end;
558         }
559
560         if (tsd->package.count != 1) {
561                 printk(KERN_ERR PREFIX "Invalid _TSD data\n");
562                 result = -EFAULT;
563                 goto end;
564         }
565
566         pdomain = &(pr->throttling.domain_info);
567
568         state.length = sizeof(struct acpi_tsd_package);
569         state.pointer = pdomain;
570
571         status = acpi_extract_package(&(tsd->package.elements[0]),
572                                       &format, &state);
573         if (ACPI_FAILURE(status)) {
574                 printk(KERN_ERR PREFIX "Invalid _TSD data\n");
575                 result = -EFAULT;
576                 goto end;
577         }
578
579         if (pdomain->num_entries != ACPI_TSD_REV0_ENTRIES) {
580                 printk(KERN_ERR PREFIX "Unknown _TSD:num_entries\n");
581                 result = -EFAULT;
582                 goto end;
583         }
584
585         if (pdomain->revision != ACPI_TSD_REV0_REVISION) {
586                 printk(KERN_ERR PREFIX "Unknown _TSD:revision\n");
587                 result = -EFAULT;
588                 goto end;
589         }
590
591         pthrottling = &pr->throttling;
592         pthrottling->tsd_valid_flag = 1;
593         pthrottling->shared_type = pdomain->coord_type;
594         cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map);
595         /*
596          * If the coordination type is not defined in ACPI spec,
597          * the tsd_valid_flag will be clear and coordination type
598          * will be forecd as DOMAIN_COORD_TYPE_SW_ALL.
599          */
600         if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
601                 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
602                 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
603                 pthrottling->tsd_valid_flag = 0;
604                 pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL;
605         }
606
607       end:
608         kfree(buffer.pointer);
609         return result;
610 }
611
612 /* --------------------------------------------------------------------------
613                               Throttling Control
614    -------------------------------------------------------------------------- */
615 static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr)
616 {
617         int state = 0;
618         u32 value = 0;
619         u32 duty_mask = 0;
620         u32 duty_value = 0;
621
622         if (!pr)
623                 return -EINVAL;
624
625         if (!pr->flags.throttling)
626                 return -ENODEV;
627
628         pr->throttling.state = 0;
629
630         duty_mask = pr->throttling.state_count - 1;
631
632         duty_mask <<= pr->throttling.duty_offset;
633
634         local_irq_disable();
635
636         value = inl(pr->throttling.address);
637
638         /*
639          * Compute the current throttling state when throttling is enabled
640          * (bit 4 is on).
641          */
642         if (value & 0x10) {
643                 duty_value = value & duty_mask;
644                 duty_value >>= pr->throttling.duty_offset;
645
646                 if (duty_value)
647                         state = pr->throttling.state_count - duty_value;
648         }
649
650         pr->throttling.state = state;
651
652         local_irq_enable();
653
654         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
655                           "Throttling state is T%d (%d%% throttling applied)\n",
656                           state, pr->throttling.states[state].performance));
657
658         return 0;
659 }
660
661 #ifdef CONFIG_X86
662 static int acpi_throttling_rdmsr(struct acpi_processor *pr,
663                                         acpi_integer * value)
664 {
665         struct cpuinfo_x86 *c;
666         u64 msr_high, msr_low;
667         unsigned int cpu;
668         u64 msr = 0;
669         int ret = -1;
670
671         cpu = pr->id;
672         c = &cpu_data(cpu);
673
674         if ((c->x86_vendor != X86_VENDOR_INTEL) ||
675                 !cpu_has(c, X86_FEATURE_ACPI)) {
676                 printk(KERN_ERR PREFIX
677                         "HARDWARE addr space,NOT supported yet\n");
678         } else {
679                 msr_low = 0;
680                 msr_high = 0;
681                 rdmsr_safe(MSR_IA32_THERM_CONTROL,
682                         (u32 *)&msr_low , (u32 *) &msr_high);
683                 msr = (msr_high << 32) | msr_low;
684                 *value = (acpi_integer) msr;
685                 ret = 0;
686         }
687         return ret;
688 }
689
690 static int acpi_throttling_wrmsr(struct acpi_processor *pr, acpi_integer value)
691 {
692         struct cpuinfo_x86 *c;
693         unsigned int cpu;
694         int ret = -1;
695         u64 msr;
696
697         cpu = pr->id;
698         c = &cpu_data(cpu);
699
700         if ((c->x86_vendor != X86_VENDOR_INTEL) ||
701                 !cpu_has(c, X86_FEATURE_ACPI)) {
702                 printk(KERN_ERR PREFIX
703                         "HARDWARE addr space,NOT supported yet\n");
704         } else {
705                 msr = value;
706                 wrmsr_safe(MSR_IA32_THERM_CONTROL,
707                         msr & 0xffffffff, msr >> 32);
708                 ret = 0;
709         }
710         return ret;
711 }
712 #else
713 static int acpi_throttling_rdmsr(struct acpi_processor *pr,
714                                 acpi_integer * value)
715 {
716         printk(KERN_ERR PREFIX
717                 "HARDWARE addr space,NOT supported yet\n");
718         return -1;
719 }
720
721 static int acpi_throttling_wrmsr(struct acpi_processor *pr, acpi_integer value)
722 {
723         printk(KERN_ERR PREFIX
724                 "HARDWARE addr space,NOT supported yet\n");
725         return -1;
726 }
727 #endif
728
729 static int acpi_read_throttling_status(struct acpi_processor *pr,
730                                         acpi_integer *value)
731 {
732         u32 bit_width, bit_offset;
733         u64 ptc_value;
734         u64 ptc_mask;
735         struct acpi_processor_throttling *throttling;
736         int ret = -1;
737
738         throttling = &pr->throttling;
739         switch (throttling->status_register.space_id) {
740         case ACPI_ADR_SPACE_SYSTEM_IO:
741                 ptc_value = 0;
742                 bit_width = throttling->status_register.bit_width;
743                 bit_offset = throttling->status_register.bit_offset;
744
745                 acpi_os_read_port((acpi_io_address) throttling->status_register.
746                                   address, (u32 *) &ptc_value,
747                                   (u32) (bit_width + bit_offset));
748                 ptc_mask = (1 << bit_width) - 1;
749                 *value = (acpi_integer) ((ptc_value >> bit_offset) & ptc_mask);
750                 ret = 0;
751                 break;
752         case ACPI_ADR_SPACE_FIXED_HARDWARE:
753                 ret = acpi_throttling_rdmsr(pr, value);
754                 break;
755         default:
756                 printk(KERN_ERR PREFIX "Unknown addr space %d\n",
757                        (u32) (throttling->status_register.space_id));
758         }
759         return ret;
760 }
761
762 static int acpi_write_throttling_state(struct acpi_processor *pr,
763                                 acpi_integer value)
764 {
765         u32 bit_width, bit_offset;
766         u64 ptc_value;
767         u64 ptc_mask;
768         struct acpi_processor_throttling *throttling;
769         int ret = -1;
770
771         throttling = &pr->throttling;
772         switch (throttling->control_register.space_id) {
773         case ACPI_ADR_SPACE_SYSTEM_IO:
774                 bit_width = throttling->control_register.bit_width;
775                 bit_offset = throttling->control_register.bit_offset;
776                 ptc_mask = (1 << bit_width) - 1;
777                 ptc_value = value & ptc_mask;
778
779                 acpi_os_write_port((acpi_io_address) throttling->
780                                         control_register.address,
781                                         (u32) (ptc_value << bit_offset),
782                                         (u32) (bit_width + bit_offset));
783                 ret = 0;
784                 break;
785         case ACPI_ADR_SPACE_FIXED_HARDWARE:
786                 ret = acpi_throttling_wrmsr(pr, value);
787                 break;
788         default:
789                 printk(KERN_ERR PREFIX "Unknown addr space %d\n",
790                        (u32) (throttling->control_register.space_id));
791         }
792         return ret;
793 }
794
795 static int acpi_get_throttling_state(struct acpi_processor *pr,
796                                 acpi_integer value)
797 {
798         int i;
799
800         for (i = 0; i < pr->throttling.state_count; i++) {
801                 struct acpi_processor_tx_tss *tx =
802                     (struct acpi_processor_tx_tss *)&(pr->throttling.
803                                                       states_tss[i]);
804                 if (tx->control == value)
805                         return i;
806         }
807         return -1;
808 }
809
810 static int acpi_get_throttling_value(struct acpi_processor *pr,
811                         int state, acpi_integer *value)
812 {
813         int ret = -1;
814
815         if (state >= 0 && state <= pr->throttling.state_count) {
816                 struct acpi_processor_tx_tss *tx =
817                     (struct acpi_processor_tx_tss *)&(pr->throttling.
818                                                       states_tss[state]);
819                 *value = tx->control;
820                 ret = 0;
821         }
822         return ret;
823 }
824
825 static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr)
826 {
827         int state = 0;
828         int ret;
829         acpi_integer value;
830
831         if (!pr)
832                 return -EINVAL;
833
834         if (!pr->flags.throttling)
835                 return -ENODEV;
836
837         pr->throttling.state = 0;
838
839         value = 0;
840         ret = acpi_read_throttling_status(pr, &value);
841         if (ret >= 0) {
842                 state = acpi_get_throttling_state(pr, value);
843                 if (state == -1) {
844                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
845                                 "Invalid throttling state, reset\n"));
846                         state = 0;
847                         ret = acpi_processor_set_throttling(pr, state, true);
848                         if (ret)
849                                 return ret;
850                 }
851                 pr->throttling.state = state;
852         }
853
854         return 0;
855 }
856
857 static int acpi_processor_get_throttling(struct acpi_processor *pr)
858 {
859         cpumask_var_t saved_mask;
860         int ret;
861
862         if (!pr)
863                 return -EINVAL;
864
865         if (!pr->flags.throttling)
866                 return -ENODEV;
867
868         if (!alloc_cpumask_var(&saved_mask, GFP_KERNEL))
869                 return -ENOMEM;
870
871         /*
872          * Migrate task to the cpu pointed by pr.
873          */
874         cpumask_copy(saved_mask, &current->cpus_allowed);
875         /* FIXME: use work_on_cpu() */
876         set_cpus_allowed_ptr(current, cpumask_of(pr->id));
877         ret = pr->throttling.acpi_processor_get_throttling(pr);
878         /* restore the previous state */
879         set_cpus_allowed_ptr(current, saved_mask);
880         free_cpumask_var(saved_mask);
881
882         return ret;
883 }
884
885 static int acpi_processor_get_fadt_info(struct acpi_processor *pr)
886 {
887         int i, step;
888
889         if (!pr->throttling.address) {
890                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n"));
891                 return -EINVAL;
892         } else if (!pr->throttling.duty_width) {
893                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling states\n"));
894                 return -EINVAL;
895         }
896         /* TBD: Support duty_cycle values that span bit 4. */
897         else if ((pr->throttling.duty_offset + pr->throttling.duty_width) > 4) {
898                 printk(KERN_WARNING PREFIX "duty_cycle spans bit 4\n");
899                 return -EINVAL;
900         }
901
902         pr->throttling.state_count = 1 << acpi_gbl_FADT.duty_width;
903
904         /*
905          * Compute state values. Note that throttling displays a linear power
906          * performance relationship (at 50% performance the CPU will consume
907          * 50% power).  Values are in 1/10th of a percent to preserve accuracy.
908          */
909
910         step = (1000 / pr->throttling.state_count);
911
912         for (i = 0; i < pr->throttling.state_count; i++) {
913                 pr->throttling.states[i].performance = 1000 - step * i;
914                 pr->throttling.states[i].power = 1000 - step * i;
915         }
916         return 0;
917 }
918
919 static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr,
920                                               int state, bool force)
921 {
922         u32 value = 0;
923         u32 duty_mask = 0;
924         u32 duty_value = 0;
925
926         if (!pr)
927                 return -EINVAL;
928
929         if ((state < 0) || (state > (pr->throttling.state_count - 1)))
930                 return -EINVAL;
931
932         if (!pr->flags.throttling)
933                 return -ENODEV;
934
935         if (!force && (state == pr->throttling.state))
936                 return 0;
937
938         if (state < pr->throttling_platform_limit)
939                 return -EPERM;
940         /*
941          * Calculate the duty_value and duty_mask.
942          */
943         if (state) {
944                 duty_value = pr->throttling.state_count - state;
945
946                 duty_value <<= pr->throttling.duty_offset;
947
948                 /* Used to clear all duty_value bits */
949                 duty_mask = pr->throttling.state_count - 1;
950
951                 duty_mask <<= acpi_gbl_FADT.duty_offset;
952                 duty_mask = ~duty_mask;
953         }
954
955         local_irq_disable();
956
957         /*
958          * Disable throttling by writing a 0 to bit 4.  Note that we must
959          * turn it off before you can change the duty_value.
960          */
961         value = inl(pr->throttling.address);
962         if (value & 0x10) {
963                 value &= 0xFFFFFFEF;
964                 outl(value, pr->throttling.address);
965         }
966
967         /*
968          * Write the new duty_value and then enable throttling.  Note
969          * that a state value of 0 leaves throttling disabled.
970          */
971         if (state) {
972                 value &= duty_mask;
973                 value |= duty_value;
974                 outl(value, pr->throttling.address);
975
976                 value |= 0x00000010;
977                 outl(value, pr->throttling.address);
978         }
979
980         pr->throttling.state = state;
981
982         local_irq_enable();
983
984         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
985                           "Throttling state set to T%d (%d%%)\n", state,
986                           (pr->throttling.states[state].performance ? pr->
987                            throttling.states[state].performance / 10 : 0)));
988
989         return 0;
990 }
991
992 static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr,
993                                              int state, bool force)
994 {
995         int ret;
996         acpi_integer value;
997
998         if (!pr)
999                 return -EINVAL;
1000
1001         if ((state < 0) || (state > (pr->throttling.state_count - 1)))
1002                 return -EINVAL;
1003
1004         if (!pr->flags.throttling)
1005                 return -ENODEV;
1006
1007         if (!force && (state == pr->throttling.state))
1008                 return 0;
1009
1010         if (state < pr->throttling_platform_limit)
1011                 return -EPERM;
1012
1013         value = 0;
1014         ret = acpi_get_throttling_value(pr, state, &value);
1015         if (ret >= 0) {
1016                 acpi_write_throttling_state(pr, value);
1017                 pr->throttling.state = state;
1018         }
1019
1020         return 0;
1021 }
1022
1023 int acpi_processor_set_throttling(struct acpi_processor *pr,
1024                                                 int state, bool force)
1025 {
1026         cpumask_var_t saved_mask;
1027         int ret = 0;
1028         unsigned int i;
1029         struct acpi_processor *match_pr;
1030         struct acpi_processor_throttling *p_throttling;
1031         struct throttling_tstate t_state;
1032         cpumask_var_t online_throttling_cpus;
1033
1034         if (!pr)
1035                 return -EINVAL;
1036
1037         if (!pr->flags.throttling)
1038                 return -ENODEV;
1039
1040         if ((state < 0) || (state > (pr->throttling.state_count - 1)))
1041                 return -EINVAL;
1042
1043         if (!alloc_cpumask_var(&saved_mask, GFP_KERNEL))
1044                 return -ENOMEM;
1045
1046         if (!alloc_cpumask_var(&online_throttling_cpus, GFP_KERNEL)) {
1047                 free_cpumask_var(saved_mask);
1048                 return -ENOMEM;
1049         }
1050
1051         cpumask_copy(saved_mask, &current->cpus_allowed);
1052         t_state.target_state = state;
1053         p_throttling = &(pr->throttling);
1054         cpumask_and(online_throttling_cpus, cpu_online_mask,
1055                     p_throttling->shared_cpu_map);
1056         /*
1057          * The throttling notifier will be called for every
1058          * affected cpu in order to get one proper T-state.
1059          * The notifier event is THROTTLING_PRECHANGE.
1060          */
1061         for_each_cpu(i, online_throttling_cpus) {
1062                 t_state.cpu = i;
1063                 acpi_processor_throttling_notifier(THROTTLING_PRECHANGE,
1064                                                         &t_state);
1065         }
1066         /*
1067          * The function of acpi_processor_set_throttling will be called
1068          * to switch T-state. If the coordination type is SW_ALL or HW_ALL,
1069          * it is necessary to call it for every affected cpu. Otherwise
1070          * it can be called only for the cpu pointed by pr.
1071          */
1072         if (p_throttling->shared_type == DOMAIN_COORD_TYPE_SW_ANY) {
1073                 /* FIXME: use work_on_cpu() */
1074                 set_cpus_allowed_ptr(current, cpumask_of(pr->id));
1075                 ret = p_throttling->acpi_processor_set_throttling(pr,
1076                                                 t_state.target_state, force);
1077         } else {
1078                 /*
1079                  * When the T-state coordination is SW_ALL or HW_ALL,
1080                  * it is necessary to set T-state for every affected
1081                  * cpus.
1082                  */
1083                 for_each_cpu(i, online_throttling_cpus) {
1084                         match_pr = per_cpu(processors, i);
1085                         /*
1086                          * If the pointer is invalid, we will report the
1087                          * error message and continue.
1088                          */
1089                         if (!match_pr) {
1090                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1091                                         "Invalid Pointer for CPU %d\n", i));
1092                                 continue;
1093                         }
1094                         /*
1095                          * If the throttling control is unsupported on CPU i,
1096                          * we will report the error message and continue.
1097                          */
1098                         if (!match_pr->flags.throttling) {
1099                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1100                                         "Throttling Controll is unsupported "
1101                                         "on CPU %d\n", i));
1102                                 continue;
1103                         }
1104                         t_state.cpu = i;
1105                         /* FIXME: use work_on_cpu() */
1106                         set_cpus_allowed_ptr(current, cpumask_of(i));
1107                         ret = match_pr->throttling.
1108                                 acpi_processor_set_throttling(
1109                                 match_pr, t_state.target_state, force);
1110                 }
1111         }
1112         /*
1113          * After the set_throttling is called, the
1114          * throttling notifier is called for every
1115          * affected cpu to update the T-states.
1116          * The notifier event is THROTTLING_POSTCHANGE
1117          */
1118         for_each_cpu(i, online_throttling_cpus) {
1119                 t_state.cpu = i;
1120                 acpi_processor_throttling_notifier(THROTTLING_POSTCHANGE,
1121                                                         &t_state);
1122         }
1123         /* restore the previous state */
1124         /* FIXME: use work_on_cpu() */
1125         set_cpus_allowed_ptr(current, saved_mask);
1126         free_cpumask_var(online_throttling_cpus);
1127         free_cpumask_var(saved_mask);
1128         return ret;
1129 }
1130
1131 int acpi_processor_get_throttling_info(struct acpi_processor *pr)
1132 {
1133         int result = 0;
1134         struct acpi_processor_throttling *pthrottling;
1135
1136         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1137                           "pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n",
1138                           pr->throttling.address,
1139                           pr->throttling.duty_offset,
1140                           pr->throttling.duty_width));
1141
1142         if (!pr)
1143                 return -EINVAL;
1144
1145         /*
1146          * Evaluate _PTC, _TSS and _TPC
1147          * They must all be present or none of them can be used.
1148          */
1149         if (acpi_processor_get_throttling_control(pr) ||
1150                 acpi_processor_get_throttling_states(pr) ||
1151                 acpi_processor_get_platform_limit(pr))
1152         {
1153                 pr->throttling.acpi_processor_get_throttling =
1154                     &acpi_processor_get_throttling_fadt;
1155                 pr->throttling.acpi_processor_set_throttling =
1156                     &acpi_processor_set_throttling_fadt;
1157                 if (acpi_processor_get_fadt_info(pr))
1158                         return 0;
1159         } else {
1160                 pr->throttling.acpi_processor_get_throttling =
1161                     &acpi_processor_get_throttling_ptc;
1162                 pr->throttling.acpi_processor_set_throttling =
1163                     &acpi_processor_set_throttling_ptc;
1164         }
1165
1166         /*
1167          * If TSD package for one CPU can't be parsed successfully, it means
1168          * that this CPU will have no coordination with other CPUs.
1169          */
1170         if (acpi_processor_get_tsd(pr)) {
1171                 pthrottling = &pr->throttling;
1172                 pthrottling->tsd_valid_flag = 0;
1173                 cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map);
1174                 pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL;
1175         }
1176
1177         /*
1178          * PIIX4 Errata: We don't support throttling on the original PIIX4.
1179          * This shouldn't be an issue as few (if any) mobile systems ever
1180          * used this part.
1181          */
1182         if (errata.piix4.throttle) {
1183                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1184                                   "Throttling not supported on PIIX4 A- or B-step\n"));
1185                 return 0;
1186         }
1187
1188         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n",
1189                           pr->throttling.state_count));
1190
1191         pr->flags.throttling = 1;
1192
1193         /*
1194          * Disable throttling (if enabled).  We'll let subsequent policy (e.g.
1195          * thermal) decide to lower performance if it so chooses, but for now
1196          * we'll crank up the speed.
1197          */
1198
1199         result = acpi_processor_get_throttling(pr);
1200         if (result)
1201                 goto end;
1202
1203         if (pr->throttling.state) {
1204                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1205                                   "Disabling throttling (was T%d)\n",
1206                                   pr->throttling.state));
1207                 result = acpi_processor_set_throttling(pr, 0, false);
1208                 if (result)
1209                         goto end;
1210         }
1211
1212       end:
1213         if (result)
1214                 pr->flags.throttling = 0;
1215
1216         return result;
1217 }
1218
1219 /* proc interface */
1220 #ifdef CONFIG_ACPI_PROCFS
1221 static int acpi_processor_throttling_seq_show(struct seq_file *seq,
1222                                               void *offset)
1223 {
1224         struct acpi_processor *pr = seq->private;
1225         int i = 0;
1226         int result = 0;
1227
1228         if (!pr)
1229                 goto end;
1230
1231         if (!(pr->throttling.state_count > 0)) {
1232                 seq_puts(seq, "<not supported>\n");
1233                 goto end;
1234         }
1235
1236         result = acpi_processor_get_throttling(pr);
1237
1238         if (result) {
1239                 seq_puts(seq,
1240                          "Could not determine current throttling state.\n");
1241                 goto end;
1242         }
1243
1244         seq_printf(seq, "state count:             %d\n"
1245                    "active state:            T%d\n"
1246                    "state available: T%d to T%d\n",
1247                    pr->throttling.state_count, pr->throttling.state,
1248                    pr->throttling_platform_limit,
1249                    pr->throttling.state_count - 1);
1250
1251         seq_puts(seq, "states:\n");
1252         if (pr->throttling.acpi_processor_get_throttling ==
1253                         acpi_processor_get_throttling_fadt) {
1254                 for (i = 0; i < pr->throttling.state_count; i++)
1255                         seq_printf(seq, "   %cT%d:                  %02d%%\n",
1256                                    (i == pr->throttling.state ? '*' : ' '), i,
1257                                    (pr->throttling.states[i].performance ? pr->
1258                                     throttling.states[i].performance / 10 : 0));
1259         } else {
1260                 for (i = 0; i < pr->throttling.state_count; i++)
1261                         seq_printf(seq, "   %cT%d:                  %02d%%\n",
1262                                    (i == pr->throttling.state ? '*' : ' '), i,
1263                                    (int)pr->throttling.states_tss[i].
1264                                    freqpercentage);
1265         }
1266
1267       end:
1268         return 0;
1269 }
1270
1271 static int acpi_processor_throttling_open_fs(struct inode *inode,
1272                                              struct file *file)
1273 {
1274         return single_open(file, acpi_processor_throttling_seq_show,
1275                            PDE(inode)->data);
1276 }
1277
1278 static ssize_t acpi_processor_write_throttling(struct file *file,
1279                                                const char __user * buffer,
1280                                                size_t count, loff_t * data)
1281 {
1282         int result = 0;
1283         struct seq_file *m = file->private_data;
1284         struct acpi_processor *pr = m->private;
1285         char state_string[5] = "";
1286         char *charp = NULL;
1287         size_t state_val = 0;
1288         char tmpbuf[5] = "";
1289
1290         if (!pr || (count > sizeof(state_string) - 1))
1291                 return -EINVAL;
1292
1293         if (copy_from_user(state_string, buffer, count))
1294                 return -EFAULT;
1295
1296         state_string[count] = '\0';
1297         if ((count > 0) && (state_string[count-1] == '\n'))
1298                 state_string[count-1] = '\0';
1299
1300         charp = state_string;
1301         if ((state_string[0] == 't') || (state_string[0] == 'T'))
1302                 charp++;
1303
1304         state_val = simple_strtoul(charp, NULL, 0);
1305         if (state_val >= pr->throttling.state_count)
1306                 return -EINVAL;
1307
1308         snprintf(tmpbuf, 5, "%zu", state_val);
1309
1310         if (strcmp(tmpbuf, charp) != 0)
1311                 return -EINVAL;
1312
1313         result = acpi_processor_set_throttling(pr, state_val, false);
1314         if (result)
1315                 return result;
1316
1317         return count;
1318 }
1319
1320 const struct file_operations acpi_processor_throttling_fops = {
1321         .owner = THIS_MODULE,
1322         .open = acpi_processor_throttling_open_fs,
1323         .read = seq_read,
1324         .write = acpi_processor_write_throttling,
1325         .llseek = seq_lseek,
1326         .release = single_release,
1327 };
1328 #endif