blob: a0bd56ece3ff55a4cdf0388ee026750123b69022 [file] [log] [blame]
Thomas Gleixnerc942fdd2019-05-27 08:55:06 +02001// SPDX-License-Identifier: GPL-2.0-or-later
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
3 * processor_throttling.c - Throttling submodule of the ACPI processor driver
4 *
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
8 * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
9 * - Added processor hotplug support
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 */
11
12#include <linux/kernel.h>
13#include <linux/module.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090014#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/init.h>
Zhao Yakui357dc4c2007-11-29 16:22:43 +080016#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/cpufreq.h>
Lv Zheng8b484632013-12-03 08:49:16 +080018#include <linux/acpi.h>
19#include <acpi/processor.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <asm/io.h>
Linus Torvalds7c0f6ba2016-12-24 11:46:01 -080021#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
Len Browna192a952009-07-28 16:45:54 -040023#define PREFIX "ACPI: "
24
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#define ACPI_PROCESSOR_CLASS "processor"
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#define _COMPONENT ACPI_PROCESSOR_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050027ACPI_MODULE_NAME("processor_throttling");
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
Zhang Rui56c213f2009-05-11 09:35:57 +080029/* ignore_tpc:
30 * 0 -> acpi processor driver doesn't ignore _TPC values
31 * 1 -> acpi processor driver ignores _TPC values
32 */
33static int ignore_tpc;
34module_param(ignore_tpc, int, 0644);
35MODULE_PARM_DESC(ignore_tpc, "Disable broken BIOS _TPC throttling support");
36
Zhao Yakuie4aa5cb2008-01-28 13:54:46 +080037struct throttling_tstate {
38 unsigned int cpu; /* cpu nr */
39 int target_state; /* target T-state */
40};
41
Lan Tianyuf3ca4162014-02-26 21:03:05 +080042struct acpi_processor_throttling_arg {
43 struct acpi_processor *pr;
44 int target_state;
45 bool force;
46};
47
Zhao Yakuie4aa5cb2008-01-28 13:54:46 +080048#define THROTTLING_PRECHANGE (1)
49#define THROTTLING_POSTCHANGE (2)
50
Len Brownff55a9c2007-06-02 00:15:25 -040051static int acpi_processor_get_throttling(struct acpi_processor *pr);
Thomas Gleixner8153f9a2017-04-12 22:07:34 +020052static int __acpi_processor_set_throttling(struct acpi_processor *pr,
53 int state, bool force, bool direct);
Luming Yu01854e62007-05-26 22:49:58 +080054
Zhao Yakui11805092008-01-28 13:53:42 +080055static int acpi_processor_update_tsd_coord(void)
56{
57 int count, count_target;
58 int retval = 0;
59 unsigned int i, j;
Rusty Russell2fdf66b2008-12-31 18:08:47 -080060 cpumask_var_t covered_cpus;
Zhao Yakui11805092008-01-28 13:53:42 +080061 struct acpi_processor *pr, *match_pr;
62 struct acpi_tsd_package *pdomain, *match_pdomain;
63 struct acpi_processor_throttling *pthrottling, *match_pthrottling;
64
Li Zefan79f55992009-06-15 14:58:26 +080065 if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
Rusty Russell2fdf66b2008-12-31 18:08:47 -080066 return -ENOMEM;
67
Zhao Yakui11805092008-01-28 13:53:42 +080068 /*
69 * Now that we have _TSD data from all CPUs, lets setup T-state
Zhao Yakui33a2a522008-01-28 13:55:56 +080070 * coordination between all CPUs.
Zhao Yakui11805092008-01-28 13:53:42 +080071 */
72 for_each_possible_cpu(i) {
Mike Travis706546d2008-06-09 16:22:23 -070073 pr = per_cpu(processors, i);
Zhao Yakui11805092008-01-28 13:53:42 +080074 if (!pr)
75 continue;
76
77 /* Basic validity check for domain info */
78 pthrottling = &(pr->throttling);
79
80 /*
81 * If tsd package for one cpu is invalid, the coordination
82 * among all CPUs is thought as invalid.
83 * Maybe it is ugly.
84 */
85 if (!pthrottling->tsd_valid_flag) {
86 retval = -EINVAL;
87 break;
88 }
89 }
90 if (retval)
91 goto err_ret;
92
Zhao Yakui11805092008-01-28 13:53:42 +080093 for_each_possible_cpu(i) {
Mike Travis706546d2008-06-09 16:22:23 -070094 pr = per_cpu(processors, i);
Zhao Yakui11805092008-01-28 13:53:42 +080095 if (!pr)
96 continue;
97
Rusty Russell2fdf66b2008-12-31 18:08:47 -080098 if (cpumask_test_cpu(i, covered_cpus))
Zhao Yakui11805092008-01-28 13:53:42 +080099 continue;
100 pthrottling = &pr->throttling;
101
102 pdomain = &(pthrottling->domain_info);
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800103 cpumask_set_cpu(i, pthrottling->shared_cpu_map);
104 cpumask_set_cpu(i, covered_cpus);
Zhao Yakui11805092008-01-28 13:53:42 +0800105 /*
106 * If the number of processor in the TSD domain is 1, it is
107 * unnecessary to parse the coordination for this CPU.
108 */
109 if (pdomain->num_processors <= 1)
110 continue;
111
112 /* Validate the Domain info */
113 count_target = pdomain->num_processors;
114 count = 1;
115
116 for_each_possible_cpu(j) {
117 if (i == j)
118 continue;
119
Mike Travis706546d2008-06-09 16:22:23 -0700120 match_pr = per_cpu(processors, j);
Zhao Yakui11805092008-01-28 13:53:42 +0800121 if (!match_pr)
122 continue;
123
124 match_pthrottling = &(match_pr->throttling);
125 match_pdomain = &(match_pthrottling->domain_info);
126 if (match_pdomain->domain != pdomain->domain)
127 continue;
128
129 /* Here i and j are in the same domain.
130 * If two TSD packages have the same domain, they
131 * should have the same num_porcessors and
132 * coordination type. Otherwise it will be regarded
133 * as illegal.
134 */
135 if (match_pdomain->num_processors != count_target) {
136 retval = -EINVAL;
137 goto err_ret;
138 }
139
140 if (pdomain->coord_type != match_pdomain->coord_type) {
141 retval = -EINVAL;
142 goto err_ret;
143 }
144
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800145 cpumask_set_cpu(j, covered_cpus);
146 cpumask_set_cpu(j, pthrottling->shared_cpu_map);
Zhao Yakui11805092008-01-28 13:53:42 +0800147 count++;
148 }
149 for_each_possible_cpu(j) {
150 if (i == j)
151 continue;
152
Mike Travis706546d2008-06-09 16:22:23 -0700153 match_pr = per_cpu(processors, j);
Zhao Yakui11805092008-01-28 13:53:42 +0800154 if (!match_pr)
155 continue;
156
157 match_pthrottling = &(match_pr->throttling);
158 match_pdomain = &(match_pthrottling->domain_info);
159 if (match_pdomain->domain != pdomain->domain)
160 continue;
161
162 /*
163 * If some CPUS have the same domain, they
164 * will have the same shared_cpu_map.
165 */
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800166 cpumask_copy(match_pthrottling->shared_cpu_map,
167 pthrottling->shared_cpu_map);
Zhao Yakui11805092008-01-28 13:53:42 +0800168 }
169 }
170
171err_ret:
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800172 free_cpumask_var(covered_cpus);
173
Zhao Yakui11805092008-01-28 13:53:42 +0800174 for_each_possible_cpu(i) {
Mike Travis706546d2008-06-09 16:22:23 -0700175 pr = per_cpu(processors, i);
Zhao Yakui11805092008-01-28 13:53:42 +0800176 if (!pr)
177 continue;
178
179 /*
180 * Assume no coordination on any error parsing domain info.
181 * The coordination type will be forced as SW_ALL.
182 */
183 if (retval) {
184 pthrottling = &(pr->throttling);
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800185 cpumask_clear(pthrottling->shared_cpu_map);
186 cpumask_set_cpu(i, pthrottling->shared_cpu_map);
Zhao Yakui11805092008-01-28 13:53:42 +0800187 pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL;
188 }
189 }
190
191 return retval;
192}
193
194/*
195 * Update the T-state coordination after the _TSD
196 * data for all cpus is obtained.
197 */
198void acpi_processor_throttling_init(void)
199{
Andy Shevchenko2d5914c2013-03-11 09:17:05 +0000200 if (acpi_processor_update_tsd_coord()) {
Zhao Yakui11805092008-01-28 13:53:42 +0800201 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
202 "Assume no T-state coordination\n"));
Andy Shevchenko2d5914c2013-03-11 09:17:05 +0000203 }
Zhao Yakui11805092008-01-28 13:53:42 +0800204
205 return;
206}
207
Zhao Yakuie4aa5cb2008-01-28 13:54:46 +0800208static int acpi_processor_throttling_notifier(unsigned long event, void *data)
209{
210 struct throttling_tstate *p_tstate = data;
211 struct acpi_processor *pr;
212 unsigned int cpu ;
213 int target_state;
214 struct acpi_processor_limit *p_limit;
215 struct acpi_processor_throttling *p_throttling;
216
217 cpu = p_tstate->cpu;
Mike Travis706546d2008-06-09 16:22:23 -0700218 pr = per_cpu(processors, cpu);
Zhao Yakuie4aa5cb2008-01-28 13:54:46 +0800219 if (!pr) {
220 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Invalid pr pointer\n"));
221 return 0;
222 }
223 if (!pr->flags.throttling) {
224 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Throttling control is "
225 "unsupported on CPU %d\n", cpu));
226 return 0;
227 }
228 target_state = p_tstate->target_state;
229 p_throttling = &(pr->throttling);
230 switch (event) {
231 case THROTTLING_PRECHANGE:
232 /*
233 * Prechange event is used to choose one proper t-state,
234 * which meets the limits of thermal, user and _TPC.
235 */
236 p_limit = &pr->limit;
237 if (p_limit->thermal.tx > target_state)
238 target_state = p_limit->thermal.tx;
239 if (p_limit->user.tx > target_state)
240 target_state = p_limit->user.tx;
241 if (pr->throttling_platform_limit > target_state)
242 target_state = pr->throttling_platform_limit;
243 if (target_state >= p_throttling->state_count) {
244 printk(KERN_WARNING
245 "Exceed the limit of T-state \n");
246 target_state = p_throttling->state_count - 1;
247 }
248 p_tstate->target_state = target_state;
249 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PreChange Event:"
250 "target T-state of CPU %d is T%d\n",
251 cpu, target_state));
252 break;
253 case THROTTLING_POSTCHANGE:
254 /*
255 * Postchange event is only used to update the
256 * T-state flag of acpi_processor_throttling.
257 */
258 p_throttling->state = target_state;
259 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PostChange Event:"
260 "CPU %d is switched to T%d\n",
261 cpu, target_state));
262 break;
263 default:
264 printk(KERN_WARNING
265 "Unsupported Throttling notifier event\n");
266 break;
267 }
268
269 return 0;
270}
271
Len Brownc30c6202007-07-25 00:57:46 -0400272/*
273 * _TPC - Throttling Present Capabilities
274 */
Luming Yu01854e62007-05-26 22:49:58 +0800275static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
276{
277 acpi_status status = 0;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400278 unsigned long long tpc = 0;
Luming Yu01854e62007-05-26 22:49:58 +0800279
Len Brownff55a9c2007-06-02 00:15:25 -0400280 if (!pr)
Luming Yu01854e62007-05-26 22:49:58 +0800281 return -EINVAL;
Zhang Rui56c213f2009-05-11 09:35:57 +0800282
283 if (ignore_tpc)
284 goto end;
285
Luming Yu01854e62007-05-26 22:49:58 +0800286 status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc);
Len Brownc30c6202007-07-25 00:57:46 -0400287 if (ACPI_FAILURE(status)) {
288 if (status != AE_NOT_FOUND) {
289 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TPC"));
290 }
Luming Yu01854e62007-05-26 22:49:58 +0800291 return -ENODEV;
292 }
Zhang Rui56c213f2009-05-11 09:35:57 +0800293
294end:
Luming Yu01854e62007-05-26 22:49:58 +0800295 pr->throttling_platform_limit = (int)tpc;
296 return 0;
297}
298
299int acpi_processor_tstate_has_changed(struct acpi_processor *pr)
300{
Zhao Yakuief54d5a2007-11-15 16:59:30 +0800301 int result = 0;
302 int throttling_limit;
303 int current_state;
304 struct acpi_processor_limit *limit;
305 int target_state;
306
Zhang Rui56c213f2009-05-11 09:35:57 +0800307 if (ignore_tpc)
308 return 0;
309
Zhao Yakuief54d5a2007-11-15 16:59:30 +0800310 result = acpi_processor_get_platform_limit(pr);
311 if (result) {
312 /* Throttling Limit is unsupported */
313 return result;
314 }
315
316 throttling_limit = pr->throttling_platform_limit;
317 if (throttling_limit >= pr->throttling.state_count) {
318 /* Uncorrect Throttling Limit */
319 return -EINVAL;
320 }
321
322 current_state = pr->throttling.state;
323 if (current_state > throttling_limit) {
324 /*
325 * The current state can meet the requirement of
326 * _TPC limit. But it is reasonable that OSPM changes
327 * t-states from high to low for better performance.
328 * Of course the limit condition of thermal
329 * and user should be considered.
330 */
331 limit = &pr->limit;
332 target_state = throttling_limit;
333 if (limit->thermal.tx > target_state)
334 target_state = limit->thermal.tx;
335 if (limit->user.tx > target_state)
336 target_state = limit->user.tx;
337 } else if (current_state == throttling_limit) {
338 /*
339 * Unnecessary to change the throttling state
340 */
341 return 0;
342 } else {
343 /*
344 * If the current state is lower than the limit of _TPC, it
345 * will be forced to switch to the throttling state defined
346 * by throttling_platfor_limit.
347 * Because the previous state meets with the limit condition
348 * of thermal and user, it is unnecessary to check it again.
349 */
350 target_state = throttling_limit;
351 }
Frans Pop2a908002009-08-26 14:29:29 -0700352 return acpi_processor_set_throttling(pr, target_state, false);
Luming Yu01854e62007-05-26 22:49:58 +0800353}
354
Len Brownc30c6202007-07-25 00:57:46 -0400355/*
Zhao Yakui5a344a52011-01-10 16:35:45 +0800356 * This function is used to reevaluate whether the T-state is valid
357 * after one CPU is onlined/offlined.
358 * It is noted that it won't reevaluate the following properties for
359 * the T-state.
360 * 1. Control method.
361 * 2. the number of supported T-state
362 * 3. TSD domain
363 */
364void acpi_processor_reevaluate_tstate(struct acpi_processor *pr,
Sebastian Andrzej Siewior64f3bf22016-09-06 19:04:47 +0200365 bool is_dead)
Zhao Yakui5a344a52011-01-10 16:35:45 +0800366{
367 int result = 0;
368
Sebastian Andrzej Siewior64f3bf22016-09-06 19:04:47 +0200369 if (is_dead) {
Zhao Yakui5a344a52011-01-10 16:35:45 +0800370 /* When one CPU is offline, the T-state throttling
371 * will be invalidated.
372 */
373 pr->flags.throttling = 0;
374 return;
375 }
376 /* the following is to recheck whether the T-state is valid for
377 * the online CPU
378 */
379 if (!pr->throttling.state_count) {
380 /* If the number of T-state is invalid, it is
381 * invalidated.
382 */
383 pr->flags.throttling = 0;
384 return;
385 }
386 pr->flags.throttling = 1;
387
388 /* Disable throttling (if enabled). We'll let subsequent
389 * policy (e.g.thermal) decide to lower performance if it
390 * so chooses, but for now we'll crank up the speed.
391 */
392
393 result = acpi_processor_get_throttling(pr);
394 if (result)
395 goto end;
396
397 if (pr->throttling.state) {
398 result = acpi_processor_set_throttling(pr, 0, false);
399 if (result)
400 goto end;
401 }
402
403end:
404 if (result)
405 pr->flags.throttling = 0;
406}
407/*
Len Brownc30c6202007-07-25 00:57:46 -0400408 * _PTC - Processor Throttling Control (and status) register location
409 */
Luming Yu01854e62007-05-26 22:49:58 +0800410static int acpi_processor_get_throttling_control(struct acpi_processor *pr)
411{
412 int result = 0;
413 acpi_status status = 0;
414 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
415 union acpi_object *ptc = NULL;
416 union acpi_object obj = { 0 };
Zhao Yakui9bcb2722007-11-15 17:05:05 +0800417 struct acpi_processor_throttling *throttling;
Luming Yu01854e62007-05-26 22:49:58 +0800418
419 status = acpi_evaluate_object(pr->handle, "_PTC", NULL, &buffer);
420 if (ACPI_FAILURE(status)) {
Len Brownc30c6202007-07-25 00:57:46 -0400421 if (status != AE_NOT_FOUND) {
422 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTC"));
423 }
Luming Yu01854e62007-05-26 22:49:58 +0800424 return -ENODEV;
425 }
426
427 ptc = (union acpi_object *)buffer.pointer;
428 if (!ptc || (ptc->type != ACPI_TYPE_PACKAGE)
429 || (ptc->package.count != 2)) {
430 printk(KERN_ERR PREFIX "Invalid _PTC data\n");
431 result = -EFAULT;
432 goto end;
433 }
434
435 /*
436 * control_register
437 */
438
439 obj = ptc->package.elements[0];
440
441 if ((obj.type != ACPI_TYPE_BUFFER)
442 || (obj.buffer.length < sizeof(struct acpi_ptc_register))
443 || (obj.buffer.pointer == NULL)) {
Len Brownff55a9c2007-06-02 00:15:25 -0400444 printk(KERN_ERR PREFIX
445 "Invalid _PTC data (control_register)\n");
Luming Yu01854e62007-05-26 22:49:58 +0800446 result = -EFAULT;
447 goto end;
448 }
449 memcpy(&pr->throttling.control_register, obj.buffer.pointer,
450 sizeof(struct acpi_ptc_register));
451
452 /*
453 * status_register
454 */
455
456 obj = ptc->package.elements[1];
457
458 if ((obj.type != ACPI_TYPE_BUFFER)
459 || (obj.buffer.length < sizeof(struct acpi_ptc_register))
460 || (obj.buffer.pointer == NULL)) {
461 printk(KERN_ERR PREFIX "Invalid _PTC data (status_register)\n");
462 result = -EFAULT;
463 goto end;
464 }
465
466 memcpy(&pr->throttling.status_register, obj.buffer.pointer,
Len Brownff55a9c2007-06-02 00:15:25 -0400467 sizeof(struct acpi_ptc_register));
Luming Yu01854e62007-05-26 22:49:58 +0800468
Zhao Yakui9bcb2722007-11-15 17:05:05 +0800469 throttling = &pr->throttling;
470
471 if ((throttling->control_register.bit_width +
472 throttling->control_register.bit_offset) > 32) {
473 printk(KERN_ERR PREFIX "Invalid _PTC control register\n");
474 result = -EFAULT;
475 goto end;
476 }
477
478 if ((throttling->status_register.bit_width +
479 throttling->status_register.bit_offset) > 32) {
480 printk(KERN_ERR PREFIX "Invalid _PTC status register\n");
481 result = -EFAULT;
482 goto end;
483 }
484
Len Brownff55a9c2007-06-02 00:15:25 -0400485 end:
Luming Yu01854e62007-05-26 22:49:58 +0800486 kfree(buffer.pointer);
487
488 return result;
489}
Len Brownc30c6202007-07-25 00:57:46 -0400490
491/*
492 * _TSS - Throttling Supported States
493 */
Luming Yu01854e62007-05-26 22:49:58 +0800494static int acpi_processor_get_throttling_states(struct acpi_processor *pr)
495{
496 int result = 0;
497 acpi_status status = AE_OK;
498 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
499 struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" };
500 struct acpi_buffer state = { 0, NULL };
501 union acpi_object *tss = NULL;
502 int i;
503
504 status = acpi_evaluate_object(pr->handle, "_TSS", NULL, &buffer);
505 if (ACPI_FAILURE(status)) {
Len Brownc30c6202007-07-25 00:57:46 -0400506 if (status != AE_NOT_FOUND) {
507 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSS"));
508 }
Luming Yu01854e62007-05-26 22:49:58 +0800509 return -ENODEV;
510 }
511
512 tss = buffer.pointer;
513 if (!tss || (tss->type != ACPI_TYPE_PACKAGE)) {
514 printk(KERN_ERR PREFIX "Invalid _TSS data\n");
515 result = -EFAULT;
516 goto end;
517 }
518
519 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n",
520 tss->package.count));
521
522 pr->throttling.state_count = tss->package.count;
523 pr->throttling.states_tss =
Kees Cook6da2ec52018-06-12 13:55:00 -0700524 kmalloc_array(tss->package.count,
525 sizeof(struct acpi_processor_tx_tss),
526 GFP_KERNEL);
Luming Yu01854e62007-05-26 22:49:58 +0800527 if (!pr->throttling.states_tss) {
528 result = -ENOMEM;
529 goto end;
530 }
531
532 for (i = 0; i < pr->throttling.state_count; i++) {
533
Len Brownff55a9c2007-06-02 00:15:25 -0400534 struct acpi_processor_tx_tss *tx =
535 (struct acpi_processor_tx_tss *)&(pr->throttling.
536 states_tss[i]);
Luming Yu01854e62007-05-26 22:49:58 +0800537
538 state.length = sizeof(struct acpi_processor_tx_tss);
539 state.pointer = tx;
540
541 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
542
543 status = acpi_extract_package(&(tss->package.elements[i]),
544 &format, &state);
545 if (ACPI_FAILURE(status)) {
546 ACPI_EXCEPTION((AE_INFO, status, "Invalid _TSS data"));
547 result = -EFAULT;
548 kfree(pr->throttling.states_tss);
549 goto end;
550 }
551
552 if (!tx->freqpercentage) {
553 printk(KERN_ERR PREFIX
Len Brownff55a9c2007-06-02 00:15:25 -0400554 "Invalid _TSS data: freq is zero\n");
Luming Yu01854e62007-05-26 22:49:58 +0800555 result = -EFAULT;
556 kfree(pr->throttling.states_tss);
557 goto end;
558 }
559 }
560
561 end:
562 kfree(buffer.pointer);
563
564 return result;
565}
Len Brownc30c6202007-07-25 00:57:46 -0400566
567/*
568 * _TSD - T-State Dependencies
569 */
Len Brownff55a9c2007-06-02 00:15:25 -0400570static int acpi_processor_get_tsd(struct acpi_processor *pr)
Luming Yu01854e62007-05-26 22:49:58 +0800571{
572 int result = 0;
573 acpi_status status = AE_OK;
Len Brownff55a9c2007-06-02 00:15:25 -0400574 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
575 struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" };
576 struct acpi_buffer state = { 0, NULL };
577 union acpi_object *tsd = NULL;
Luming Yu01854e62007-05-26 22:49:58 +0800578 struct acpi_tsd_package *pdomain;
Zhao Yakui11805092008-01-28 13:53:42 +0800579 struct acpi_processor_throttling *pthrottling;
580
581 pthrottling = &pr->throttling;
582 pthrottling->tsd_valid_flag = 0;
Luming Yu01854e62007-05-26 22:49:58 +0800583
584 status = acpi_evaluate_object(pr->handle, "_TSD", NULL, &buffer);
585 if (ACPI_FAILURE(status)) {
Len Brownc30c6202007-07-25 00:57:46 -0400586 if (status != AE_NOT_FOUND) {
587 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSD"));
588 }
Luming Yu01854e62007-05-26 22:49:58 +0800589 return -ENODEV;
590 }
591
592 tsd = buffer.pointer;
593 if (!tsd || (tsd->type != ACPI_TYPE_PACKAGE)) {
Lin Ming55ac9a02008-09-28 14:51:56 +0800594 printk(KERN_ERR PREFIX "Invalid _TSD data\n");
Luming Yu01854e62007-05-26 22:49:58 +0800595 result = -EFAULT;
596 goto end;
597 }
598
599 if (tsd->package.count != 1) {
Lin Ming55ac9a02008-09-28 14:51:56 +0800600 printk(KERN_ERR PREFIX "Invalid _TSD data\n");
Luming Yu01854e62007-05-26 22:49:58 +0800601 result = -EFAULT;
602 goto end;
603 }
604
605 pdomain = &(pr->throttling.domain_info);
606
607 state.length = sizeof(struct acpi_tsd_package);
608 state.pointer = pdomain;
609
610 status = acpi_extract_package(&(tsd->package.elements[0]),
Len Brownff55a9c2007-06-02 00:15:25 -0400611 &format, &state);
Luming Yu01854e62007-05-26 22:49:58 +0800612 if (ACPI_FAILURE(status)) {
Lin Ming55ac9a02008-09-28 14:51:56 +0800613 printk(KERN_ERR PREFIX "Invalid _TSD data\n");
Luming Yu01854e62007-05-26 22:49:58 +0800614 result = -EFAULT;
615 goto end;
616 }
617
618 if (pdomain->num_entries != ACPI_TSD_REV0_ENTRIES) {
Lin Ming55ac9a02008-09-28 14:51:56 +0800619 printk(KERN_ERR PREFIX "Unknown _TSD:num_entries\n");
Luming Yu01854e62007-05-26 22:49:58 +0800620 result = -EFAULT;
621 goto end;
622 }
623
624 if (pdomain->revision != ACPI_TSD_REV0_REVISION) {
Lin Ming55ac9a02008-09-28 14:51:56 +0800625 printk(KERN_ERR PREFIX "Unknown _TSD:revision\n");
Luming Yu01854e62007-05-26 22:49:58 +0800626 result = -EFAULT;
627 goto end;
628 }
629
Zhao Yakui11805092008-01-28 13:53:42 +0800630 pthrottling = &pr->throttling;
631 pthrottling->tsd_valid_flag = 1;
632 pthrottling->shared_type = pdomain->coord_type;
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800633 cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map);
Zhao Yakui11805092008-01-28 13:53:42 +0800634 /*
635 * If the coordination type is not defined in ACPI spec,
636 * the tsd_valid_flag will be clear and coordination type
637 * will be forecd as DOMAIN_COORD_TYPE_SW_ALL.
638 */
639 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
640 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
641 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
642 pthrottling->tsd_valid_flag = 0;
643 pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL;
644 }
645
Len Brownff55a9c2007-06-02 00:15:25 -0400646 end:
Luming Yu01854e62007-05-26 22:49:58 +0800647 kfree(buffer.pointer);
648 return result;
649}
650
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651/* --------------------------------------------------------------------------
652 Throttling Control
653 -------------------------------------------------------------------------- */
Luming Yu01854e62007-05-26 22:49:58 +0800654static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655{
Len Brown4be44fc2005-08-05 00:44:28 -0400656 int state = 0;
657 u32 value = 0;
658 u32 duty_mask = 0;
659 u32 duty_value = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400662 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663
664 if (!pr->flags.throttling)
Patrick Mocheld550d982006-06-27 00:41:40 -0400665 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666
Rafael J. Wysocki86314752016-06-02 01:57:50 +0200667 /*
668 * We don't care about error returns - we just try to mark
669 * these reserved so that nobody else is confused into thinking
670 * that this region might be unused..
671 *
672 * (In particular, allocating the IO range for Cardbus)
673 */
674 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
675
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 pr->throttling.state = 0;
677
678 duty_mask = pr->throttling.state_count - 1;
679
680 duty_mask <<= pr->throttling.duty_offset;
681
682 local_irq_disable();
683
684 value = inl(pr->throttling.address);
685
686 /*
687 * Compute the current throttling state when throttling is enabled
688 * (bit 4 is on).
689 */
690 if (value & 0x10) {
691 duty_value = value & duty_mask;
692 duty_value >>= pr->throttling.duty_offset;
693
694 if (duty_value)
Len Brown4be44fc2005-08-05 00:44:28 -0400695 state = pr->throttling.state_count - duty_value;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 }
697
698 pr->throttling.state = state;
699
700 local_irq_enable();
701
702 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400703 "Throttling state is T%d (%d%% throttling applied)\n",
704 state, pr->throttling.states[state].performance));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705
Patrick Mocheld550d982006-06-27 00:41:40 -0400706 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707}
708
Zhao Yakuif79f06a2007-11-15 17:06:36 +0800709#ifdef CONFIG_X86
Christoph Lameter9d42a532011-03-12 12:51:12 +0100710static int acpi_throttling_rdmsr(u64 *value)
Zhao Yakuif79f06a2007-11-15 17:06:36 +0800711{
Zhao Yakuif79f06a2007-11-15 17:06:36 +0800712 u64 msr_high, msr_low;
Zhao Yakuif79f06a2007-11-15 17:06:36 +0800713 u64 msr = 0;
714 int ret = -1;
715
Christoph Lameter9d42a532011-03-12 12:51:12 +0100716 if ((this_cpu_read(cpu_info.x86_vendor) != X86_VENDOR_INTEL) ||
717 !this_cpu_has(X86_FEATURE_ACPI)) {
Zhao Yakuif79f06a2007-11-15 17:06:36 +0800718 printk(KERN_ERR PREFIX
719 "HARDWARE addr space,NOT supported yet\n");
720 } else {
721 msr_low = 0;
722 msr_high = 0;
Zhao Yakui357dc4c2007-11-29 16:22:43 +0800723 rdmsr_safe(MSR_IA32_THERM_CONTROL,
Zhao Yakuif79f06a2007-11-15 17:06:36 +0800724 (u32 *)&msr_low , (u32 *) &msr_high);
725 msr = (msr_high << 32) | msr_low;
Lin Ming439913f2010-01-28 10:53:19 +0800726 *value = (u64) msr;
Zhao Yakuif79f06a2007-11-15 17:06:36 +0800727 ret = 0;
728 }
729 return ret;
730}
731
Christoph Lameter9d42a532011-03-12 12:51:12 +0100732static int acpi_throttling_wrmsr(u64 value)
Zhao Yakuif79f06a2007-11-15 17:06:36 +0800733{
Zhao Yakuif79f06a2007-11-15 17:06:36 +0800734 int ret = -1;
735 u64 msr;
736
Christoph Lameter9d42a532011-03-12 12:51:12 +0100737 if ((this_cpu_read(cpu_info.x86_vendor) != X86_VENDOR_INTEL) ||
738 !this_cpu_has(X86_FEATURE_ACPI)) {
Zhao Yakuif79f06a2007-11-15 17:06:36 +0800739 printk(KERN_ERR PREFIX
740 "HARDWARE addr space,NOT supported yet\n");
741 } else {
742 msr = value;
Zhao Yakui357dc4c2007-11-29 16:22:43 +0800743 wrmsr_safe(MSR_IA32_THERM_CONTROL,
Zhao Yakuif79f06a2007-11-15 17:06:36 +0800744 msr & 0xffffffff, msr >> 32);
745 ret = 0;
746 }
747 return ret;
748}
749#else
Christoph Lameter9d42a532011-03-12 12:51:12 +0100750static int acpi_throttling_rdmsr(u64 *value)
Zhao Yakuif79f06a2007-11-15 17:06:36 +0800751{
752 printk(KERN_ERR PREFIX
753 "HARDWARE addr space,NOT supported yet\n");
754 return -1;
755}
756
Christoph Lameter9d42a532011-03-12 12:51:12 +0100757static int acpi_throttling_wrmsr(u64 value)
Zhao Yakuif79f06a2007-11-15 17:06:36 +0800758{
759 printk(KERN_ERR PREFIX
760 "HARDWARE addr space,NOT supported yet\n");
761 return -1;
762}
763#endif
764
Zhao Yakui0753f6e2007-11-15 17:03:46 +0800765static int acpi_read_throttling_status(struct acpi_processor *pr,
Lin Ming439913f2010-01-28 10:53:19 +0800766 u64 *value)
Luming Yu01854e62007-05-26 22:49:58 +0800767{
Zhao Yakui9bcb2722007-11-15 17:05:05 +0800768 u32 bit_width, bit_offset;
Dan Carpenter344e2222012-03-07 14:57:36 +0300769 u32 ptc_value;
Zhao Yakui9bcb2722007-11-15 17:05:05 +0800770 u64 ptc_mask;
Zhao Yakui0753f6e2007-11-15 17:03:46 +0800771 struct acpi_processor_throttling *throttling;
772 int ret = -1;
773
774 throttling = &pr->throttling;
Luming Yu01854e62007-05-26 22:49:58 +0800775 switch (throttling->status_register.space_id) {
776 case ACPI_ADR_SPACE_SYSTEM_IO:
Zhao Yakui9bcb2722007-11-15 17:05:05 +0800777 bit_width = throttling->status_register.bit_width;
778 bit_offset = throttling->status_register.bit_offset;
779
Len Brownff55a9c2007-06-02 00:15:25 -0400780 acpi_os_read_port((acpi_io_address) throttling->status_register.
Dan Carpenter344e2222012-03-07 14:57:36 +0300781 address, &ptc_value,
Zhao Yakui9bcb2722007-11-15 17:05:05 +0800782 (u32) (bit_width + bit_offset));
783 ptc_mask = (1 << bit_width) - 1;
Lin Ming439913f2010-01-28 10:53:19 +0800784 *value = (u64) ((ptc_value >> bit_offset) & ptc_mask);
Zhao Yakui0753f6e2007-11-15 17:03:46 +0800785 ret = 0;
Luming Yu01854e62007-05-26 22:49:58 +0800786 break;
787 case ACPI_ADR_SPACE_FIXED_HARDWARE:
Christoph Lameter9d42a532011-03-12 12:51:12 +0100788 ret = acpi_throttling_rdmsr(value);
Luming Yu01854e62007-05-26 22:49:58 +0800789 break;
790 default:
791 printk(KERN_ERR PREFIX "Unknown addr space %d\n",
Len Brownff55a9c2007-06-02 00:15:25 -0400792 (u32) (throttling->status_register.space_id));
Luming Yu01854e62007-05-26 22:49:58 +0800793 }
Zhao Yakui0753f6e2007-11-15 17:03:46 +0800794 return ret;
Luming Yu01854e62007-05-26 22:49:58 +0800795}
796
Zhao Yakui0753f6e2007-11-15 17:03:46 +0800797static int acpi_write_throttling_state(struct acpi_processor *pr,
Lin Ming439913f2010-01-28 10:53:19 +0800798 u64 value)
Luming Yu01854e62007-05-26 22:49:58 +0800799{
Zhao Yakui9bcb2722007-11-15 17:05:05 +0800800 u32 bit_width, bit_offset;
Zhao Yakui0753f6e2007-11-15 17:03:46 +0800801 u64 ptc_value;
Zhao Yakui9bcb2722007-11-15 17:05:05 +0800802 u64 ptc_mask;
Zhao Yakui0753f6e2007-11-15 17:03:46 +0800803 struct acpi_processor_throttling *throttling;
Luming Yu01854e62007-05-26 22:49:58 +0800804 int ret = -1;
805
Zhao Yakui0753f6e2007-11-15 17:03:46 +0800806 throttling = &pr->throttling;
Luming Yu01854e62007-05-26 22:49:58 +0800807 switch (throttling->control_register.space_id) {
808 case ACPI_ADR_SPACE_SYSTEM_IO:
Zhao Yakui9bcb2722007-11-15 17:05:05 +0800809 bit_width = throttling->control_register.bit_width;
810 bit_offset = throttling->control_register.bit_offset;
811 ptc_mask = (1 << bit_width) - 1;
812 ptc_value = value & ptc_mask;
813
Len Brownff55a9c2007-06-02 00:15:25 -0400814 acpi_os_write_port((acpi_io_address) throttling->
Zhao Yakui9bcb2722007-11-15 17:05:05 +0800815 control_register.address,
816 (u32) (ptc_value << bit_offset),
817 (u32) (bit_width + bit_offset));
Luming Yu01854e62007-05-26 22:49:58 +0800818 ret = 0;
819 break;
820 case ACPI_ADR_SPACE_FIXED_HARDWARE:
Christoph Lameter9d42a532011-03-12 12:51:12 +0100821 ret = acpi_throttling_wrmsr(value);
Luming Yu01854e62007-05-26 22:49:58 +0800822 break;
823 default:
824 printk(KERN_ERR PREFIX "Unknown addr space %d\n",
Len Brownff55a9c2007-06-02 00:15:25 -0400825 (u32) (throttling->control_register.space_id));
Luming Yu01854e62007-05-26 22:49:58 +0800826 }
827 return ret;
828}
829
Zhao Yakui0753f6e2007-11-15 17:03:46 +0800830static int acpi_get_throttling_state(struct acpi_processor *pr,
Lin Ming439913f2010-01-28 10:53:19 +0800831 u64 value)
Luming Yu01854e62007-05-26 22:49:58 +0800832{
833 int i;
834
835 for (i = 0; i < pr->throttling.state_count; i++) {
Len Brownff55a9c2007-06-02 00:15:25 -0400836 struct acpi_processor_tx_tss *tx =
837 (struct acpi_processor_tx_tss *)&(pr->throttling.
838 states_tss[i]);
839 if (tx->control == value)
Len Brown53af9cf2009-03-15 23:36:38 -0400840 return i;
Luming Yu01854e62007-05-26 22:49:58 +0800841 }
Len Brown53af9cf2009-03-15 23:36:38 -0400842 return -1;
Luming Yu01854e62007-05-26 22:49:58 +0800843}
844
Zhao Yakui0753f6e2007-11-15 17:03:46 +0800845static int acpi_get_throttling_value(struct acpi_processor *pr,
Lin Ming439913f2010-01-28 10:53:19 +0800846 int state, u64 *value)
Luming Yu01854e62007-05-26 22:49:58 +0800847{
Zhao Yakui0753f6e2007-11-15 17:03:46 +0800848 int ret = -1;
849
Len Brownff55a9c2007-06-02 00:15:25 -0400850 if (state >= 0 && state <= pr->throttling.state_count) {
851 struct acpi_processor_tx_tss *tx =
852 (struct acpi_processor_tx_tss *)&(pr->throttling.
853 states_tss[state]);
Zhao Yakui0753f6e2007-11-15 17:03:46 +0800854 *value = tx->control;
855 ret = 0;
Luming Yu01854e62007-05-26 22:49:58 +0800856 }
Zhao Yakui0753f6e2007-11-15 17:03:46 +0800857 return ret;
Luming Yu01854e62007-05-26 22:49:58 +0800858}
859
860static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr)
861{
862 int state = 0;
Zhao Yakui0753f6e2007-11-15 17:03:46 +0800863 int ret;
Lin Ming439913f2010-01-28 10:53:19 +0800864 u64 value;
Luming Yu01854e62007-05-26 22:49:58 +0800865
Luming Yu01854e62007-05-26 22:49:58 +0800866 if (!pr)
867 return -EINVAL;
868
869 if (!pr->flags.throttling)
870 return -ENODEV;
871
872 pr->throttling.state = 0;
Zhao Yakui357dc4c2007-11-29 16:22:43 +0800873
Zhao Yakui0753f6e2007-11-15 17:03:46 +0800874 value = 0;
875 ret = acpi_read_throttling_status(pr, &value);
876 if (ret >= 0) {
Len Brownff55a9c2007-06-02 00:15:25 -0400877 state = acpi_get_throttling_state(pr, value);
Zhang Rui4973b222009-05-11 09:36:01 +0800878 if (state == -1) {
Frans Popbdf57de2009-08-26 14:29:30 -0700879 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
880 "Invalid throttling state, reset\n"));
Zhang Rui4973b222009-05-11 09:36:01 +0800881 state = 0;
Thomas Gleixner8153f9a2017-04-12 22:07:34 +0200882 ret = __acpi_processor_set_throttling(pr, state, true,
883 true);
Zhang Rui4973b222009-05-11 09:36:01 +0800884 if (ret)
885 return ret;
886 }
Luming Yu01854e62007-05-26 22:49:58 +0800887 pr->throttling.state = state;
888 }
Luming Yu01854e62007-05-26 22:49:58 +0800889
890 return 0;
891}
892
Thomas Gleixner8153f9a2017-04-12 22:07:34 +0200893static long __acpi_processor_get_throttling(void *data)
894{
895 struct acpi_processor *pr = data;
896
897 return pr->throttling.acpi_processor_get_throttling(pr);
898}
899
Luming Yu01854e62007-05-26 22:49:58 +0800900static int acpi_processor_get_throttling(struct acpi_processor *pr)
901{
Zhao Yakui87654272008-01-28 13:53:30 +0800902 if (!pr)
903 return -EINVAL;
904
905 if (!pr->flags.throttling)
906 return -ENODEV;
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800907
Zhao Yakui357dc4c2007-11-29 16:22:43 +0800908 /*
Thomas Gleixner8153f9a2017-04-12 22:07:34 +0200909 * This is either called from the CPU hotplug callback of
910 * processor_driver or via the ACPI probe function. In the latter
911 * case the CPU is not guaranteed to be online. Both call sites are
912 * protected against CPU hotplug.
Zhao Yakui357dc4c2007-11-29 16:22:43 +0800913 */
Thomas Gleixner8153f9a2017-04-12 22:07:34 +0200914 if (!cpu_online(pr->id))
Zhao Yakuidaef1f352011-01-10 16:35:44 +0800915 return -ENODEV;
Zhao Yakui357dc4c2007-11-29 16:22:43 +0800916
Thomas Gleixner0266d812017-05-24 10:15:42 +0200917 return call_on_cpu(pr->id, __acpi_processor_get_throttling, pr, false);
Luming Yu01854e62007-05-26 22:49:58 +0800918}
919
Zhao Yakui22cc5012007-11-15 17:02:03 +0800920static int acpi_processor_get_fadt_info(struct acpi_processor *pr)
921{
922 int i, step;
923
924 if (!pr->throttling.address) {
925 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n"));
926 return -EINVAL;
927 } else if (!pr->throttling.duty_width) {
928 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling states\n"));
929 return -EINVAL;
930 }
931 /* TBD: Support duty_cycle values that span bit 4. */
932 else if ((pr->throttling.duty_offset + pr->throttling.duty_width) > 4) {
933 printk(KERN_WARNING PREFIX "duty_cycle spans bit 4\n");
934 return -EINVAL;
935 }
936
937 pr->throttling.state_count = 1 << acpi_gbl_FADT.duty_width;
938
939 /*
940 * Compute state values. Note that throttling displays a linear power
941 * performance relationship (at 50% performance the CPU will consume
942 * 50% power). Values are in 1/10th of a percent to preserve accuracy.
943 */
944
945 step = (1000 / pr->throttling.state_count);
946
947 for (i = 0; i < pr->throttling.state_count; i++) {
948 pr->throttling.states[i].performance = 1000 - step * i;
949 pr->throttling.states[i].power = 1000 - step * i;
950 }
951 return 0;
952}
953
Adrian Bunk6c5cf8a2007-07-03 00:53:12 -0400954static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr,
Frans Pop2a908002009-08-26 14:29:29 -0700955 int state, bool force)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956{
Len Brown4be44fc2005-08-05 00:44:28 -0400957 u32 value = 0;
958 u32 duty_mask = 0;
959 u32 duty_value = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 if (!pr)
Patrick Mocheld550d982006-06-27 00:41:40 -0400962 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963
964 if ((state < 0) || (state > (pr->throttling.state_count - 1)))
Patrick Mocheld550d982006-06-27 00:41:40 -0400965 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966
967 if (!pr->flags.throttling)
Patrick Mocheld550d982006-06-27 00:41:40 -0400968 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969
Frans Pop2a908002009-08-26 14:29:29 -0700970 if (!force && (state == pr->throttling.state))
Patrick Mocheld550d982006-06-27 00:41:40 -0400971 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972
Luming Yu01854e62007-05-26 22:49:58 +0800973 if (state < pr->throttling_platform_limit)
974 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 /*
976 * Calculate the duty_value and duty_mask.
977 */
978 if (state) {
979 duty_value = pr->throttling.state_count - state;
980
981 duty_value <<= pr->throttling.duty_offset;
982
983 /* Used to clear all duty_value bits */
984 duty_mask = pr->throttling.state_count - 1;
985
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300986 duty_mask <<= acpi_gbl_FADT.duty_offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 duty_mask = ~duty_mask;
988 }
989
990 local_irq_disable();
991
992 /*
993 * Disable throttling by writing a 0 to bit 4. Note that we must
994 * turn it off before you can change the duty_value.
995 */
996 value = inl(pr->throttling.address);
997 if (value & 0x10) {
998 value &= 0xFFFFFFEF;
999 outl(value, pr->throttling.address);
1000 }
1001
1002 /*
1003 * Write the new duty_value and then enable throttling. Note
1004 * that a state value of 0 leaves throttling disabled.
1005 */
1006 if (state) {
1007 value &= duty_mask;
1008 value |= duty_value;
1009 outl(value, pr->throttling.address);
1010
1011 value |= 0x00000010;
1012 outl(value, pr->throttling.address);
1013 }
1014
1015 pr->throttling.state = state;
1016
1017 local_irq_enable();
1018
1019 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -04001020 "Throttling state set to T%d (%d%%)\n", state,
1021 (pr->throttling.states[state].performance ? pr->
1022 throttling.states[state].performance / 10 : 0)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023
Patrick Mocheld550d982006-06-27 00:41:40 -04001024 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025}
1026
Adrian Bunk6c5cf8a2007-07-03 00:53:12 -04001027static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr,
Frans Pop2a908002009-08-26 14:29:29 -07001028 int state, bool force)
Luming Yu01854e62007-05-26 22:49:58 +08001029{
Zhao Yakui0753f6e2007-11-15 17:03:46 +08001030 int ret;
Lin Ming439913f2010-01-28 10:53:19 +08001031 u64 value;
Luming Yu01854e62007-05-26 22:49:58 +08001032
1033 if (!pr)
1034 return -EINVAL;
1035
1036 if ((state < 0) || (state > (pr->throttling.state_count - 1)))
1037 return -EINVAL;
1038
1039 if (!pr->flags.throttling)
1040 return -ENODEV;
1041
Frans Pop2a908002009-08-26 14:29:29 -07001042 if (!force && (state == pr->throttling.state))
Luming Yu01854e62007-05-26 22:49:58 +08001043 return 0;
1044
1045 if (state < pr->throttling_platform_limit)
1046 return -EPERM;
1047
Zhao Yakui0753f6e2007-11-15 17:03:46 +08001048 value = 0;
1049 ret = acpi_get_throttling_value(pr, state, &value);
1050 if (ret >= 0) {
1051 acpi_write_throttling_state(pr, value);
Luming Yu01854e62007-05-26 22:49:58 +08001052 pr->throttling.state = state;
1053 }
Luming Yu01854e62007-05-26 22:49:58 +08001054
1055 return 0;
1056}
1057
Lan Tianyuf3ca4162014-02-26 21:03:05 +08001058static long acpi_processor_throttling_fn(void *data)
1059{
1060 struct acpi_processor_throttling_arg *arg = data;
1061 struct acpi_processor *pr = arg->pr;
1062
1063 return pr->throttling.acpi_processor_set_throttling(pr,
1064 arg->target_state, arg->force);
1065}
1066
Thomas Gleixner8153f9a2017-04-12 22:07:34 +02001067static int __acpi_processor_set_throttling(struct acpi_processor *pr,
1068 int state, bool force, bool direct)
Luming Yu01854e62007-05-26 22:49:58 +08001069{
Len Brown3391a762008-02-02 03:56:18 -05001070 int ret = 0;
Zhao Yakui33a2a522008-01-28 13:55:56 +08001071 unsigned int i;
1072 struct acpi_processor *match_pr;
1073 struct acpi_processor_throttling *p_throttling;
Lan Tianyuf3ca4162014-02-26 21:03:05 +08001074 struct acpi_processor_throttling_arg arg;
Zhao Yakui33a2a522008-01-28 13:55:56 +08001075 struct throttling_tstate t_state;
Zhao Yakui87654272008-01-28 13:53:30 +08001076
1077 if (!pr)
1078 return -EINVAL;
1079
1080 if (!pr->flags.throttling)
1081 return -ENODEV;
1082
1083 if ((state < 0) || (state > (pr->throttling.state_count - 1)))
1084 return -EINVAL;
1085
Zhao Yakuidaef1f352011-01-10 16:35:44 +08001086 if (cpu_is_offline(pr->id)) {
1087 /*
1088 * the cpu pointed by pr->id is offline. Unnecessary to change
1089 * the throttling state any more.
1090 */
1091 return -ENODEV;
1092 }
1093
Zhao Yakui33a2a522008-01-28 13:55:56 +08001094 t_state.target_state = state;
1095 p_throttling = &(pr->throttling);
Lan Tianyuf3ca4162014-02-26 21:03:05 +08001096
Zhao Yakui33a2a522008-01-28 13:55:56 +08001097 /*
1098 * The throttling notifier will be called for every
1099 * affected cpu in order to get one proper T-state.
1100 * The notifier event is THROTTLING_PRECHANGE.
1101 */
Lan Tianyuf3ca4162014-02-26 21:03:05 +08001102 for_each_cpu_and(i, cpu_online_mask, p_throttling->shared_cpu_map) {
Zhao Yakui33a2a522008-01-28 13:55:56 +08001103 t_state.cpu = i;
1104 acpi_processor_throttling_notifier(THROTTLING_PRECHANGE,
1105 &t_state);
1106 }
1107 /*
1108 * The function of acpi_processor_set_throttling will be called
1109 * to switch T-state. If the coordination type is SW_ALL or HW_ALL,
1110 * it is necessary to call it for every affected cpu. Otherwise
1111 * it can be called only for the cpu pointed by pr.
1112 */
1113 if (p_throttling->shared_type == DOMAIN_COORD_TYPE_SW_ANY) {
Lan Tianyuf3ca4162014-02-26 21:03:05 +08001114 arg.pr = pr;
1115 arg.target_state = state;
1116 arg.force = force;
Thomas Gleixner8153f9a2017-04-12 22:07:34 +02001117 ret = call_on_cpu(pr->id, acpi_processor_throttling_fn, &arg,
1118 direct);
Zhao Yakui33a2a522008-01-28 13:55:56 +08001119 } else {
1120 /*
1121 * When the T-state coordination is SW_ALL or HW_ALL,
1122 * it is necessary to set T-state for every affected
1123 * cpus.
1124 */
Lan Tianyuf3ca4162014-02-26 21:03:05 +08001125 for_each_cpu_and(i, cpu_online_mask,
1126 p_throttling->shared_cpu_map) {
Mike Travis706546d2008-06-09 16:22:23 -07001127 match_pr = per_cpu(processors, i);
Zhao Yakui33a2a522008-01-28 13:55:56 +08001128 /*
1129 * If the pointer is invalid, we will report the
1130 * error message and continue.
1131 */
1132 if (!match_pr) {
1133 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1134 "Invalid Pointer for CPU %d\n", i));
1135 continue;
1136 }
1137 /*
1138 * If the throttling control is unsupported on CPU i,
1139 * we will report the error message and continue.
1140 */
1141 if (!match_pr->flags.throttling) {
1142 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001143 "Throttling Control is unsupported "
Zhao Yakui33a2a522008-01-28 13:55:56 +08001144 "on CPU %d\n", i));
1145 continue;
1146 }
Lan Tianyuf3ca4162014-02-26 21:03:05 +08001147
1148 arg.pr = match_pr;
1149 arg.target_state = state;
1150 arg.force = force;
Thomas Gleixner8153f9a2017-04-12 22:07:34 +02001151 ret = call_on_cpu(pr->id, acpi_processor_throttling_fn,
1152 &arg, direct);
Zhao Yakui33a2a522008-01-28 13:55:56 +08001153 }
1154 }
1155 /*
1156 * After the set_throttling is called, the
1157 * throttling notifier is called for every
1158 * affected cpu to update the T-states.
1159 * The notifier event is THROTTLING_POSTCHANGE
1160 */
Lan Tianyuf3ca4162014-02-26 21:03:05 +08001161 for_each_cpu_and(i, cpu_online_mask, p_throttling->shared_cpu_map) {
Zhao Yakui33a2a522008-01-28 13:55:56 +08001162 t_state.cpu = i;
1163 acpi_processor_throttling_notifier(THROTTLING_POSTCHANGE,
1164 &t_state);
1165 }
Lan Tianyuf3ca4162014-02-26 21:03:05 +08001166
Zhao Yakui357dc4c2007-11-29 16:22:43 +08001167 return ret;
Luming Yu01854e62007-05-26 22:49:58 +08001168}
1169
Thomas Gleixner8153f9a2017-04-12 22:07:34 +02001170int acpi_processor_set_throttling(struct acpi_processor *pr, int state,
1171 bool force)
1172{
1173 return __acpi_processor_set_throttling(pr, state, force, false);
1174}
1175
Len Brown4be44fc2005-08-05 00:44:28 -04001176int acpi_processor_get_throttling_info(struct acpi_processor *pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177{
Len Brown4be44fc2005-08-05 00:44:28 -04001178 int result = 0;
Zhao Yakui11805092008-01-28 13:53:42 +08001179 struct acpi_processor_throttling *pthrottling;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -04001182 "pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n",
1183 pr->throttling.address,
1184 pr->throttling.duty_offset,
1185 pr->throttling.duty_width));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186
Len Brownc30c6202007-07-25 00:57:46 -04001187 /*
1188 * Evaluate _PTC, _TSS and _TPC
1189 * They must all be present or none of them can be used.
1190 */
1191 if (acpi_processor_get_throttling_control(pr) ||
1192 acpi_processor_get_throttling_states(pr) ||
1193 acpi_processor_get_platform_limit(pr))
1194 {
Len Brownff55a9c2007-06-02 00:15:25 -04001195 pr->throttling.acpi_processor_get_throttling =
1196 &acpi_processor_get_throttling_fadt;
1197 pr->throttling.acpi_processor_set_throttling =
1198 &acpi_processor_set_throttling_fadt;
Alexey Starikovskiyd1154be2008-01-15 00:47:47 -05001199 if (acpi_processor_get_fadt_info(pr))
1200 return 0;
Luming Yu01854e62007-05-26 22:49:58 +08001201 } else {
Len Brownff55a9c2007-06-02 00:15:25 -04001202 pr->throttling.acpi_processor_get_throttling =
1203 &acpi_processor_get_throttling_ptc;
1204 pr->throttling.acpi_processor_set_throttling =
1205 &acpi_processor_set_throttling_ptc;
Luming Yu01854e62007-05-26 22:49:58 +08001206 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207
Zhao Yakui11805092008-01-28 13:53:42 +08001208 /*
1209 * If TSD package for one CPU can't be parsed successfully, it means
1210 * that this CPU will have no coordination with other CPUs.
1211 */
1212 if (acpi_processor_get_tsd(pr)) {
1213 pthrottling = &pr->throttling;
1214 pthrottling->tsd_valid_flag = 0;
Rusty Russell2fdf66b2008-12-31 18:08:47 -08001215 cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map);
Zhao Yakui11805092008-01-28 13:53:42 +08001216 pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL;
1217 }
Len Brownc30c6202007-07-25 00:57:46 -04001218
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219 /*
1220 * PIIX4 Errata: We don't support throttling on the original PIIX4.
1221 * This shouldn't be an issue as few (if any) mobile systems ever
1222 * used this part.
1223 */
1224 if (errata.piix4.throttle) {
1225 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -04001226 "Throttling not supported on PIIX4 A- or B-step\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -04001227 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 }
1229
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n",
Len Brown4be44fc2005-08-05 00:44:28 -04001231 pr->throttling.state_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232
1233 pr->flags.throttling = 1;
1234
1235 /*
1236 * Disable throttling (if enabled). We'll let subsequent policy (e.g.
1237 * thermal) decide to lower performance if it so chooses, but for now
1238 * we'll crank up the speed.
1239 */
1240
1241 result = acpi_processor_get_throttling(pr);
1242 if (result)
1243 goto end;
1244
1245 if (pr->throttling.state) {
Len Brown4be44fc2005-08-05 00:44:28 -04001246 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1247 "Disabling throttling (was T%d)\n",
1248 pr->throttling.state));
Frans Pop2a908002009-08-26 14:29:29 -07001249 result = acpi_processor_set_throttling(pr, 0, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 if (result)
1251 goto end;
1252 }
1253
Len Brown4be44fc2005-08-05 00:44:28 -04001254 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255 if (result)
1256 pr->flags.throttling = 0;
1257
Patrick Mocheld550d982006-06-27 00:41:40 -04001258 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259}
1260