Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
1da177e4 | 32 | #include <linux/init.h> |
357dc4c3 | 33 | #include <linux/sched.h> |
1da177e4 | 34 | #include <linux/cpufreq.h> |
d5c6887c | 35 | #ifdef CONFIG_ACPI_PROCFS |
1da177e4 LT |
36 | #include <linux/proc_fs.h> |
37 | #include <linux/seq_file.h> | |
d5c6887c | 38 | #endif |
1da177e4 LT |
39 | |
40 | #include <asm/io.h> | |
41 | #include <asm/uaccess.h> | |
42 | ||
43 | #include <acpi/acpi_bus.h> | |
89595b8f | 44 | #include <acpi/acpi_drivers.h> |
1da177e4 LT |
45 | #include <acpi/processor.h> |
46 | ||
a192a958 LB |
47 | #define PREFIX "ACPI: " |
48 | ||
1da177e4 | 49 | #define ACPI_PROCESSOR_CLASS "processor" |
1da177e4 | 50 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
f52fd66d | 51 | ACPI_MODULE_NAME("processor_throttling"); |
1da177e4 | 52 | |
56c213fa ZR |
53 | /* ignore_tpc: |
54 | * 0 -> acpi processor driver doesn't ignore _TPC values | |
55 | * 1 -> acpi processor driver ignores _TPC values | |
56 | */ | |
57 | static int ignore_tpc; | |
58 | module_param(ignore_tpc, int, 0644); | |
59 | MODULE_PARM_DESC(ignore_tpc, "Disable broken BIOS _TPC throttling support"); | |
60 | ||
e4aa5cb2 ZY |
61 | struct throttling_tstate { |
62 | unsigned int cpu; /* cpu nr */ | |
63 | int target_state; /* target T-state */ | |
64 | }; | |
65 | ||
66 | #define THROTTLING_PRECHANGE (1) | |
67 | #define THROTTLING_POSTCHANGE (2) | |
68 | ||
ff55a9ce | 69 | static int acpi_processor_get_throttling(struct acpi_processor *pr); |
2a908002 FP |
70 | int acpi_processor_set_throttling(struct acpi_processor *pr, |
71 | int state, bool force); | |
01854e69 | 72 | |
1180509f ZY |
73 | static int acpi_processor_update_tsd_coord(void) |
74 | { | |
75 | int count, count_target; | |
76 | int retval = 0; | |
77 | unsigned int i, j; | |
2fdf66b4 | 78 | cpumask_var_t covered_cpus; |
1180509f ZY |
79 | struct acpi_processor *pr, *match_pr; |
80 | struct acpi_tsd_package *pdomain, *match_pdomain; | |
81 | struct acpi_processor_throttling *pthrottling, *match_pthrottling; | |
82 | ||
79f55997 | 83 | if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) |
2fdf66b4 RR |
84 | return -ENOMEM; |
85 | ||
1180509f ZY |
86 | /* |
87 | * Now that we have _TSD data from all CPUs, lets setup T-state | |
33a2a529 | 88 | * coordination between all CPUs. |
1180509f ZY |
89 | */ |
90 | for_each_possible_cpu(i) { | |
706546d0 | 91 | pr = per_cpu(processors, i); |
1180509f ZY |
92 | if (!pr) |
93 | continue; | |
94 | ||
95 | /* Basic validity check for domain info */ | |
96 | pthrottling = &(pr->throttling); | |
97 | ||
98 | /* | |
99 | * If tsd package for one cpu is invalid, the coordination | |
100 | * among all CPUs is thought as invalid. | |
101 | * Maybe it is ugly. | |
102 | */ | |
103 | if (!pthrottling->tsd_valid_flag) { | |
104 | retval = -EINVAL; | |
105 | break; | |
106 | } | |
107 | } | |
108 | if (retval) | |
109 | goto err_ret; | |
110 | ||
1180509f | 111 | for_each_possible_cpu(i) { |
706546d0 | 112 | pr = per_cpu(processors, i); |
1180509f ZY |
113 | if (!pr) |
114 | continue; | |
115 | ||
2fdf66b4 | 116 | if (cpumask_test_cpu(i, covered_cpus)) |
1180509f ZY |
117 | continue; |
118 | pthrottling = &pr->throttling; | |
119 | ||
120 | pdomain = &(pthrottling->domain_info); | |
2fdf66b4 RR |
121 | cpumask_set_cpu(i, pthrottling->shared_cpu_map); |
122 | cpumask_set_cpu(i, covered_cpus); | |
1180509f ZY |
123 | /* |
124 | * If the number of processor in the TSD domain is 1, it is | |
125 | * unnecessary to parse the coordination for this CPU. | |
126 | */ | |
127 | if (pdomain->num_processors <= 1) | |
128 | continue; | |
129 | ||
130 | /* Validate the Domain info */ | |
131 | count_target = pdomain->num_processors; | |
132 | count = 1; | |
133 | ||
134 | for_each_possible_cpu(j) { | |
135 | if (i == j) | |
136 | continue; | |
137 | ||
706546d0 | 138 | match_pr = per_cpu(processors, j); |
1180509f ZY |
139 | if (!match_pr) |
140 | continue; | |
141 | ||
142 | match_pthrottling = &(match_pr->throttling); | |
143 | match_pdomain = &(match_pthrottling->domain_info); | |
144 | if (match_pdomain->domain != pdomain->domain) | |
145 | continue; | |
146 | ||
147 | /* Here i and j are in the same domain. | |
148 | * If two TSD packages have the same domain, they | |
149 | * should have the same num_porcessors and | |
150 | * coordination type. Otherwise it will be regarded | |
151 | * as illegal. | |
152 | */ | |
153 | if (match_pdomain->num_processors != count_target) { | |
154 | retval = -EINVAL; | |
155 | goto err_ret; | |
156 | } | |
157 | ||
158 | if (pdomain->coord_type != match_pdomain->coord_type) { | |
159 | retval = -EINVAL; | |
160 | goto err_ret; | |
161 | } | |
162 | ||
2fdf66b4 RR |
163 | cpumask_set_cpu(j, covered_cpus); |
164 | cpumask_set_cpu(j, pthrottling->shared_cpu_map); | |
1180509f ZY |
165 | count++; |
166 | } | |
167 | for_each_possible_cpu(j) { | |
168 | if (i == j) | |
169 | continue; | |
170 | ||
706546d0 | 171 | match_pr = per_cpu(processors, j); |
1180509f ZY |
172 | if (!match_pr) |
173 | continue; | |
174 | ||
175 | match_pthrottling = &(match_pr->throttling); | |
176 | match_pdomain = &(match_pthrottling->domain_info); | |
177 | if (match_pdomain->domain != pdomain->domain) | |
178 | continue; | |
179 | ||
180 | /* | |
181 | * If some CPUS have the same domain, they | |
182 | * will have the same shared_cpu_map. | |
183 | */ | |
2fdf66b4 RR |
184 | cpumask_copy(match_pthrottling->shared_cpu_map, |
185 | pthrottling->shared_cpu_map); | |
1180509f ZY |
186 | } |
187 | } | |
188 | ||
189 | err_ret: | |
2fdf66b4 RR |
190 | free_cpumask_var(covered_cpus); |
191 | ||
1180509f | 192 | for_each_possible_cpu(i) { |
706546d0 | 193 | pr = per_cpu(processors, i); |
1180509f ZY |
194 | if (!pr) |
195 | continue; | |
196 | ||
197 | /* | |
198 | * Assume no coordination on any error parsing domain info. | |
199 | * The coordination type will be forced as SW_ALL. | |
200 | */ | |
201 | if (retval) { | |
202 | pthrottling = &(pr->throttling); | |
2fdf66b4 RR |
203 | cpumask_clear(pthrottling->shared_cpu_map); |
204 | cpumask_set_cpu(i, pthrottling->shared_cpu_map); | |
1180509f ZY |
205 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; |
206 | } | |
207 | } | |
208 | ||
209 | return retval; | |
210 | } | |
211 | ||
212 | /* | |
213 | * Update the T-state coordination after the _TSD | |
214 | * data for all cpus is obtained. | |
215 | */ | |
216 | void acpi_processor_throttling_init(void) | |
217 | { | |
218 | if (acpi_processor_update_tsd_coord()) | |
219 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
220 | "Assume no T-state coordination\n")); | |
221 | ||
222 | return; | |
223 | } | |
224 | ||
e4aa5cb2 ZY |
225 | static int acpi_processor_throttling_notifier(unsigned long event, void *data) |
226 | { | |
227 | struct throttling_tstate *p_tstate = data; | |
228 | struct acpi_processor *pr; | |
229 | unsigned int cpu ; | |
230 | int target_state; | |
231 | struct acpi_processor_limit *p_limit; | |
232 | struct acpi_processor_throttling *p_throttling; | |
233 | ||
234 | cpu = p_tstate->cpu; | |
706546d0 | 235 | pr = per_cpu(processors, cpu); |
e4aa5cb2 ZY |
236 | if (!pr) { |
237 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Invalid pr pointer\n")); | |
238 | return 0; | |
239 | } | |
240 | if (!pr->flags.throttling) { | |
241 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Throttling control is " | |
242 | "unsupported on CPU %d\n", cpu)); | |
243 | return 0; | |
244 | } | |
245 | target_state = p_tstate->target_state; | |
246 | p_throttling = &(pr->throttling); | |
247 | switch (event) { | |
248 | case THROTTLING_PRECHANGE: | |
249 | /* | |
250 | * Prechange event is used to choose one proper t-state, | |
251 | * which meets the limits of thermal, user and _TPC. | |
252 | */ | |
253 | p_limit = &pr->limit; | |
254 | if (p_limit->thermal.tx > target_state) | |
255 | target_state = p_limit->thermal.tx; | |
256 | if (p_limit->user.tx > target_state) | |
257 | target_state = p_limit->user.tx; | |
258 | if (pr->throttling_platform_limit > target_state) | |
259 | target_state = pr->throttling_platform_limit; | |
260 | if (target_state >= p_throttling->state_count) { | |
261 | printk(KERN_WARNING | |
262 | "Exceed the limit of T-state \n"); | |
263 | target_state = p_throttling->state_count - 1; | |
264 | } | |
265 | p_tstate->target_state = target_state; | |
266 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PreChange Event:" | |
267 | "target T-state of CPU %d is T%d\n", | |
268 | cpu, target_state)); | |
269 | break; | |
270 | case THROTTLING_POSTCHANGE: | |
271 | /* | |
272 | * Postchange event is only used to update the | |
273 | * T-state flag of acpi_processor_throttling. | |
274 | */ | |
275 | p_throttling->state = target_state; | |
276 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PostChange Event:" | |
277 | "CPU %d is switched to T%d\n", | |
278 | cpu, target_state)); | |
279 | break; | |
280 | default: | |
281 | printk(KERN_WARNING | |
282 | "Unsupported Throttling notifier event\n"); | |
283 | break; | |
284 | } | |
285 | ||
286 | return 0; | |
287 | } | |
288 | ||
c30c620e LB |
289 | /* |
290 | * _TPC - Throttling Present Capabilities | |
291 | */ | |
01854e69 LY |
292 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
293 | { | |
294 | acpi_status status = 0; | |
27663c58 | 295 | unsigned long long tpc = 0; |
01854e69 | 296 | |
ff55a9ce | 297 | if (!pr) |
01854e69 | 298 | return -EINVAL; |
56c213fa ZR |
299 | |
300 | if (ignore_tpc) | |
301 | goto end; | |
302 | ||
01854e69 | 303 | status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc); |
c30c620e LB |
304 | if (ACPI_FAILURE(status)) { |
305 | if (status != AE_NOT_FOUND) { | |
306 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TPC")); | |
307 | } | |
01854e69 LY |
308 | return -ENODEV; |
309 | } | |
56c213fa ZR |
310 | |
311 | end: | |
01854e69 LY |
312 | pr->throttling_platform_limit = (int)tpc; |
313 | return 0; | |
314 | } | |
315 | ||
316 | int acpi_processor_tstate_has_changed(struct acpi_processor *pr) | |
317 | { | |
ef54d5ad ZY |
318 | int result = 0; |
319 | int throttling_limit; | |
320 | int current_state; | |
321 | struct acpi_processor_limit *limit; | |
322 | int target_state; | |
323 | ||
56c213fa ZR |
324 | if (ignore_tpc) |
325 | return 0; | |
326 | ||
ef54d5ad ZY |
327 | result = acpi_processor_get_platform_limit(pr); |
328 | if (result) { | |
329 | /* Throttling Limit is unsupported */ | |
330 | return result; | |
331 | } | |
332 | ||
333 | throttling_limit = pr->throttling_platform_limit; | |
334 | if (throttling_limit >= pr->throttling.state_count) { | |
335 | /* Uncorrect Throttling Limit */ | |
336 | return -EINVAL; | |
337 | } | |
338 | ||
339 | current_state = pr->throttling.state; | |
340 | if (current_state > throttling_limit) { | |
341 | /* | |
342 | * The current state can meet the requirement of | |
343 | * _TPC limit. But it is reasonable that OSPM changes | |
344 | * t-states from high to low for better performance. | |
345 | * Of course the limit condition of thermal | |
346 | * and user should be considered. | |
347 | */ | |
348 | limit = &pr->limit; | |
349 | target_state = throttling_limit; | |
350 | if (limit->thermal.tx > target_state) | |
351 | target_state = limit->thermal.tx; | |
352 | if (limit->user.tx > target_state) | |
353 | target_state = limit->user.tx; | |
354 | } else if (current_state == throttling_limit) { | |
355 | /* | |
356 | * Unnecessary to change the throttling state | |
357 | */ | |
358 | return 0; | |
359 | } else { | |
360 | /* | |
361 | * If the current state is lower than the limit of _TPC, it | |
362 | * will be forced to switch to the throttling state defined | |
363 | * by throttling_platfor_limit. | |
364 | * Because the previous state meets with the limit condition | |
365 | * of thermal and user, it is unnecessary to check it again. | |
366 | */ | |
367 | target_state = throttling_limit; | |
368 | } | |
2a908002 | 369 | return acpi_processor_set_throttling(pr, target_state, false); |
01854e69 LY |
370 | } |
371 | ||
c30c620e LB |
372 | /* |
373 | * _PTC - Processor Throttling Control (and status) register location | |
374 | */ | |
01854e69 LY |
375 | static int acpi_processor_get_throttling_control(struct acpi_processor *pr) |
376 | { | |
377 | int result = 0; | |
378 | acpi_status status = 0; | |
379 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
380 | union acpi_object *ptc = NULL; | |
381 | union acpi_object obj = { 0 }; | |
9bcb2721 | 382 | struct acpi_processor_throttling *throttling; |
01854e69 LY |
383 | |
384 | status = acpi_evaluate_object(pr->handle, "_PTC", NULL, &buffer); | |
385 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
386 | if (status != AE_NOT_FOUND) { |
387 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTC")); | |
388 | } | |
01854e69 LY |
389 | return -ENODEV; |
390 | } | |
391 | ||
392 | ptc = (union acpi_object *)buffer.pointer; | |
393 | if (!ptc || (ptc->type != ACPI_TYPE_PACKAGE) | |
394 | || (ptc->package.count != 2)) { | |
395 | printk(KERN_ERR PREFIX "Invalid _PTC data\n"); | |
396 | result = -EFAULT; | |
397 | goto end; | |
398 | } | |
399 | ||
400 | /* | |
401 | * control_register | |
402 | */ | |
403 | ||
404 | obj = ptc->package.elements[0]; | |
405 | ||
406 | if ((obj.type != ACPI_TYPE_BUFFER) | |
407 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) | |
408 | || (obj.buffer.pointer == NULL)) { | |
ff55a9ce LB |
409 | printk(KERN_ERR PREFIX |
410 | "Invalid _PTC data (control_register)\n"); | |
01854e69 LY |
411 | result = -EFAULT; |
412 | goto end; | |
413 | } | |
414 | memcpy(&pr->throttling.control_register, obj.buffer.pointer, | |
415 | sizeof(struct acpi_ptc_register)); | |
416 | ||
417 | /* | |
418 | * status_register | |
419 | */ | |
420 | ||
421 | obj = ptc->package.elements[1]; | |
422 | ||
423 | if ((obj.type != ACPI_TYPE_BUFFER) | |
424 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) | |
425 | || (obj.buffer.pointer == NULL)) { | |
426 | printk(KERN_ERR PREFIX "Invalid _PTC data (status_register)\n"); | |
427 | result = -EFAULT; | |
428 | goto end; | |
429 | } | |
430 | ||
431 | memcpy(&pr->throttling.status_register, obj.buffer.pointer, | |
ff55a9ce | 432 | sizeof(struct acpi_ptc_register)); |
01854e69 | 433 | |
9bcb2721 ZY |
434 | throttling = &pr->throttling; |
435 | ||
436 | if ((throttling->control_register.bit_width + | |
437 | throttling->control_register.bit_offset) > 32) { | |
438 | printk(KERN_ERR PREFIX "Invalid _PTC control register\n"); | |
439 | result = -EFAULT; | |
440 | goto end; | |
441 | } | |
442 | ||
443 | if ((throttling->status_register.bit_width + | |
444 | throttling->status_register.bit_offset) > 32) { | |
445 | printk(KERN_ERR PREFIX "Invalid _PTC status register\n"); | |
446 | result = -EFAULT; | |
447 | goto end; | |
448 | } | |
449 | ||
ff55a9ce | 450 | end: |
01854e69 LY |
451 | kfree(buffer.pointer); |
452 | ||
453 | return result; | |
454 | } | |
c30c620e LB |
455 | |
456 | /* | |
457 | * _TSS - Throttling Supported States | |
458 | */ | |
01854e69 LY |
459 | static int acpi_processor_get_throttling_states(struct acpi_processor *pr) |
460 | { | |
461 | int result = 0; | |
462 | acpi_status status = AE_OK; | |
463 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
464 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
465 | struct acpi_buffer state = { 0, NULL }; | |
466 | union acpi_object *tss = NULL; | |
467 | int i; | |
468 | ||
469 | status = acpi_evaluate_object(pr->handle, "_TSS", NULL, &buffer); | |
470 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
471 | if (status != AE_NOT_FOUND) { |
472 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSS")); | |
473 | } | |
01854e69 LY |
474 | return -ENODEV; |
475 | } | |
476 | ||
477 | tss = buffer.pointer; | |
478 | if (!tss || (tss->type != ACPI_TYPE_PACKAGE)) { | |
479 | printk(KERN_ERR PREFIX "Invalid _TSS data\n"); | |
480 | result = -EFAULT; | |
481 | goto end; | |
482 | } | |
483 | ||
484 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", | |
485 | tss->package.count)); | |
486 | ||
487 | pr->throttling.state_count = tss->package.count; | |
488 | pr->throttling.states_tss = | |
489 | kmalloc(sizeof(struct acpi_processor_tx_tss) * tss->package.count, | |
490 | GFP_KERNEL); | |
491 | if (!pr->throttling.states_tss) { | |
492 | result = -ENOMEM; | |
493 | goto end; | |
494 | } | |
495 | ||
496 | for (i = 0; i < pr->throttling.state_count; i++) { | |
497 | ||
ff55a9ce LB |
498 | struct acpi_processor_tx_tss *tx = |
499 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
500 | states_tss[i]); | |
01854e69 LY |
501 | |
502 | state.length = sizeof(struct acpi_processor_tx_tss); | |
503 | state.pointer = tx; | |
504 | ||
505 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
506 | ||
507 | status = acpi_extract_package(&(tss->package.elements[i]), | |
508 | &format, &state); | |
509 | if (ACPI_FAILURE(status)) { | |
510 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _TSS data")); | |
511 | result = -EFAULT; | |
512 | kfree(pr->throttling.states_tss); | |
513 | goto end; | |
514 | } | |
515 | ||
516 | if (!tx->freqpercentage) { | |
517 | printk(KERN_ERR PREFIX | |
ff55a9ce | 518 | "Invalid _TSS data: freq is zero\n"); |
01854e69 LY |
519 | result = -EFAULT; |
520 | kfree(pr->throttling.states_tss); | |
521 | goto end; | |
522 | } | |
523 | } | |
524 | ||
525 | end: | |
526 | kfree(buffer.pointer); | |
527 | ||
528 | return result; | |
529 | } | |
c30c620e LB |
530 | |
531 | /* | |
532 | * _TSD - T-State Dependencies | |
533 | */ | |
ff55a9ce | 534 | static int acpi_processor_get_tsd(struct acpi_processor *pr) |
01854e69 LY |
535 | { |
536 | int result = 0; | |
537 | acpi_status status = AE_OK; | |
ff55a9ce LB |
538 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
539 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
540 | struct acpi_buffer state = { 0, NULL }; | |
541 | union acpi_object *tsd = NULL; | |
01854e69 | 542 | struct acpi_tsd_package *pdomain; |
1180509f ZY |
543 | struct acpi_processor_throttling *pthrottling; |
544 | ||
545 | pthrottling = &pr->throttling; | |
546 | pthrottling->tsd_valid_flag = 0; | |
01854e69 LY |
547 | |
548 | status = acpi_evaluate_object(pr->handle, "_TSD", NULL, &buffer); | |
549 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
550 | if (status != AE_NOT_FOUND) { |
551 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSD")); | |
552 | } | |
01854e69 LY |
553 | return -ENODEV; |
554 | } | |
555 | ||
556 | tsd = buffer.pointer; | |
557 | if (!tsd || (tsd->type != ACPI_TYPE_PACKAGE)) { | |
55ac9a01 | 558 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
01854e69 LY |
559 | result = -EFAULT; |
560 | goto end; | |
561 | } | |
562 | ||
563 | if (tsd->package.count != 1) { | |
55ac9a01 | 564 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
01854e69 LY |
565 | result = -EFAULT; |
566 | goto end; | |
567 | } | |
568 | ||
569 | pdomain = &(pr->throttling.domain_info); | |
570 | ||
571 | state.length = sizeof(struct acpi_tsd_package); | |
572 | state.pointer = pdomain; | |
573 | ||
574 | status = acpi_extract_package(&(tsd->package.elements[0]), | |
ff55a9ce | 575 | &format, &state); |
01854e69 | 576 | if (ACPI_FAILURE(status)) { |
55ac9a01 | 577 | printk(KERN_ERR PREFIX "Invalid _TSD data\n"); |
01854e69 LY |
578 | result = -EFAULT; |
579 | goto end; | |
580 | } | |
581 | ||
582 | if (pdomain->num_entries != ACPI_TSD_REV0_ENTRIES) { | |
55ac9a01 | 583 | printk(KERN_ERR PREFIX "Unknown _TSD:num_entries\n"); |
01854e69 LY |
584 | result = -EFAULT; |
585 | goto end; | |
586 | } | |
587 | ||
588 | if (pdomain->revision != ACPI_TSD_REV0_REVISION) { | |
55ac9a01 | 589 | printk(KERN_ERR PREFIX "Unknown _TSD:revision\n"); |
01854e69 LY |
590 | result = -EFAULT; |
591 | goto end; | |
592 | } | |
593 | ||
1180509f ZY |
594 | pthrottling = &pr->throttling; |
595 | pthrottling->tsd_valid_flag = 1; | |
596 | pthrottling->shared_type = pdomain->coord_type; | |
2fdf66b4 | 597 | cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map); |
1180509f ZY |
598 | /* |
599 | * If the coordination type is not defined in ACPI spec, | |
600 | * the tsd_valid_flag will be clear and coordination type | |
601 | * will be forecd as DOMAIN_COORD_TYPE_SW_ALL. | |
602 | */ | |
603 | if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL && | |
604 | pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY && | |
605 | pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) { | |
606 | pthrottling->tsd_valid_flag = 0; | |
607 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; | |
608 | } | |
609 | ||
ff55a9ce | 610 | end: |
01854e69 LY |
611 | kfree(buffer.pointer); |
612 | return result; | |
613 | } | |
614 | ||
1da177e4 LT |
615 | /* -------------------------------------------------------------------------- |
616 | Throttling Control | |
617 | -------------------------------------------------------------------------- */ | |
01854e69 | 618 | static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr) |
1da177e4 | 619 | { |
4be44fcd LB |
620 | int state = 0; |
621 | u32 value = 0; | |
622 | u32 duty_mask = 0; | |
623 | u32 duty_value = 0; | |
1da177e4 | 624 | |
1da177e4 | 625 | if (!pr) |
d550d98d | 626 | return -EINVAL; |
1da177e4 LT |
627 | |
628 | if (!pr->flags.throttling) | |
d550d98d | 629 | return -ENODEV; |
1da177e4 LT |
630 | |
631 | pr->throttling.state = 0; | |
632 | ||
633 | duty_mask = pr->throttling.state_count - 1; | |
634 | ||
635 | duty_mask <<= pr->throttling.duty_offset; | |
636 | ||
637 | local_irq_disable(); | |
638 | ||
639 | value = inl(pr->throttling.address); | |
640 | ||
641 | /* | |
642 | * Compute the current throttling state when throttling is enabled | |
643 | * (bit 4 is on). | |
644 | */ | |
645 | if (value & 0x10) { | |
646 | duty_value = value & duty_mask; | |
647 | duty_value >>= pr->throttling.duty_offset; | |
648 | ||
649 | if (duty_value) | |
4be44fcd | 650 | state = pr->throttling.state_count - duty_value; |
1da177e4 LT |
651 | } |
652 | ||
653 | pr->throttling.state = state; | |
654 | ||
655 | local_irq_enable(); | |
656 | ||
657 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
658 | "Throttling state is T%d (%d%% throttling applied)\n", |
659 | state, pr->throttling.states[state].performance)); | |
1da177e4 | 660 | |
d550d98d | 661 | return 0; |
1da177e4 LT |
662 | } |
663 | ||
f79f06ab ZY |
664 | #ifdef CONFIG_X86 |
665 | static int acpi_throttling_rdmsr(struct acpi_processor *pr, | |
439913ff | 666 | u64 *value) |
f79f06ab ZY |
667 | { |
668 | struct cpuinfo_x86 *c; | |
669 | u64 msr_high, msr_low; | |
670 | unsigned int cpu; | |
671 | u64 msr = 0; | |
672 | int ret = -1; | |
673 | ||
674 | cpu = pr->id; | |
675 | c = &cpu_data(cpu); | |
676 | ||
677 | if ((c->x86_vendor != X86_VENDOR_INTEL) || | |
678 | !cpu_has(c, X86_FEATURE_ACPI)) { | |
679 | printk(KERN_ERR PREFIX | |
680 | "HARDWARE addr space,NOT supported yet\n"); | |
681 | } else { | |
682 | msr_low = 0; | |
683 | msr_high = 0; | |
357dc4c3 | 684 | rdmsr_safe(MSR_IA32_THERM_CONTROL, |
f79f06ab ZY |
685 | (u32 *)&msr_low , (u32 *) &msr_high); |
686 | msr = (msr_high << 32) | msr_low; | |
439913ff | 687 | *value = (u64) msr; |
f79f06ab ZY |
688 | ret = 0; |
689 | } | |
690 | return ret; | |
691 | } | |
692 | ||
439913ff | 693 | static int acpi_throttling_wrmsr(struct acpi_processor *pr, u64 value) |
f79f06ab ZY |
694 | { |
695 | struct cpuinfo_x86 *c; | |
696 | unsigned int cpu; | |
697 | int ret = -1; | |
698 | u64 msr; | |
699 | ||
700 | cpu = pr->id; | |
701 | c = &cpu_data(cpu); | |
702 | ||
703 | if ((c->x86_vendor != X86_VENDOR_INTEL) || | |
704 | !cpu_has(c, X86_FEATURE_ACPI)) { | |
705 | printk(KERN_ERR PREFIX | |
706 | "HARDWARE addr space,NOT supported yet\n"); | |
707 | } else { | |
708 | msr = value; | |
357dc4c3 | 709 | wrmsr_safe(MSR_IA32_THERM_CONTROL, |
f79f06ab ZY |
710 | msr & 0xffffffff, msr >> 32); |
711 | ret = 0; | |
712 | } | |
713 | return ret; | |
714 | } | |
715 | #else | |
716 | static int acpi_throttling_rdmsr(struct acpi_processor *pr, | |
439913ff | 717 | u64 *value) |
f79f06ab ZY |
718 | { |
719 | printk(KERN_ERR PREFIX | |
720 | "HARDWARE addr space,NOT supported yet\n"); | |
721 | return -1; | |
722 | } | |
723 | ||
439913ff | 724 | static int acpi_throttling_wrmsr(struct acpi_processor *pr, u64 value) |
f79f06ab ZY |
725 | { |
726 | printk(KERN_ERR PREFIX | |
727 | "HARDWARE addr space,NOT supported yet\n"); | |
728 | return -1; | |
729 | } | |
730 | #endif | |
731 | ||
0753f6e0 | 732 | static int acpi_read_throttling_status(struct acpi_processor *pr, |
439913ff | 733 | u64 *value) |
01854e69 | 734 | { |
9bcb2721 | 735 | u32 bit_width, bit_offset; |
0753f6e0 | 736 | u64 ptc_value; |
9bcb2721 | 737 | u64 ptc_mask; |
0753f6e0 ZY |
738 | struct acpi_processor_throttling *throttling; |
739 | int ret = -1; | |
740 | ||
741 | throttling = &pr->throttling; | |
01854e69 LY |
742 | switch (throttling->status_register.space_id) { |
743 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
0753f6e0 | 744 | ptc_value = 0; |
9bcb2721 ZY |
745 | bit_width = throttling->status_register.bit_width; |
746 | bit_offset = throttling->status_register.bit_offset; | |
747 | ||
ff55a9ce | 748 | acpi_os_read_port((acpi_io_address) throttling->status_register. |
0753f6e0 | 749 | address, (u32 *) &ptc_value, |
9bcb2721 ZY |
750 | (u32) (bit_width + bit_offset)); |
751 | ptc_mask = (1 << bit_width) - 1; | |
439913ff | 752 | *value = (u64) ((ptc_value >> bit_offset) & ptc_mask); |
0753f6e0 | 753 | ret = 0; |
01854e69 LY |
754 | break; |
755 | case ACPI_ADR_SPACE_FIXED_HARDWARE: | |
f79f06ab | 756 | ret = acpi_throttling_rdmsr(pr, value); |
01854e69 LY |
757 | break; |
758 | default: | |
759 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", | |
ff55a9ce | 760 | (u32) (throttling->status_register.space_id)); |
01854e69 | 761 | } |
0753f6e0 | 762 | return ret; |
01854e69 LY |
763 | } |
764 | ||
0753f6e0 | 765 | static int acpi_write_throttling_state(struct acpi_processor *pr, |
439913ff | 766 | u64 value) |
01854e69 | 767 | { |
9bcb2721 | 768 | u32 bit_width, bit_offset; |
0753f6e0 | 769 | u64 ptc_value; |
9bcb2721 | 770 | u64 ptc_mask; |
0753f6e0 | 771 | struct acpi_processor_throttling *throttling; |
01854e69 LY |
772 | int ret = -1; |
773 | ||
0753f6e0 | 774 | throttling = &pr->throttling; |
01854e69 LY |
775 | switch (throttling->control_register.space_id) { |
776 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
9bcb2721 ZY |
777 | bit_width = throttling->control_register.bit_width; |
778 | bit_offset = throttling->control_register.bit_offset; | |
779 | ptc_mask = (1 << bit_width) - 1; | |
780 | ptc_value = value & ptc_mask; | |
781 | ||
ff55a9ce | 782 | acpi_os_write_port((acpi_io_address) throttling-> |
9bcb2721 ZY |
783 | control_register.address, |
784 | (u32) (ptc_value << bit_offset), | |
785 | (u32) (bit_width + bit_offset)); | |
01854e69 LY |
786 | ret = 0; |
787 | break; | |
788 | case ACPI_ADR_SPACE_FIXED_HARDWARE: | |
f79f06ab | 789 | ret = acpi_throttling_wrmsr(pr, value); |
01854e69 LY |
790 | break; |
791 | default: | |
792 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", | |
ff55a9ce | 793 | (u32) (throttling->control_register.space_id)); |
01854e69 LY |
794 | } |
795 | return ret; | |
796 | } | |
797 | ||
0753f6e0 | 798 | static int acpi_get_throttling_state(struct acpi_processor *pr, |
439913ff | 799 | u64 value) |
01854e69 LY |
800 | { |
801 | int i; | |
802 | ||
803 | for (i = 0; i < pr->throttling.state_count; i++) { | |
ff55a9ce LB |
804 | struct acpi_processor_tx_tss *tx = |
805 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
806 | states_tss[i]); | |
807 | if (tx->control == value) | |
53af9cfb | 808 | return i; |
01854e69 | 809 | } |
53af9cfb | 810 | return -1; |
01854e69 LY |
811 | } |
812 | ||
0753f6e0 | 813 | static int acpi_get_throttling_value(struct acpi_processor *pr, |
439913ff | 814 | int state, u64 *value) |
01854e69 | 815 | { |
0753f6e0 ZY |
816 | int ret = -1; |
817 | ||
ff55a9ce LB |
818 | if (state >= 0 && state <= pr->throttling.state_count) { |
819 | struct acpi_processor_tx_tss *tx = | |
820 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
821 | states_tss[state]); | |
0753f6e0 ZY |
822 | *value = tx->control; |
823 | ret = 0; | |
01854e69 | 824 | } |
0753f6e0 | 825 | return ret; |
01854e69 LY |
826 | } |
827 | ||
828 | static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr) | |
829 | { | |
830 | int state = 0; | |
0753f6e0 | 831 | int ret; |
439913ff | 832 | u64 value; |
01854e69 | 833 | |
01854e69 LY |
834 | if (!pr) |
835 | return -EINVAL; | |
836 | ||
837 | if (!pr->flags.throttling) | |
838 | return -ENODEV; | |
839 | ||
840 | pr->throttling.state = 0; | |
357dc4c3 | 841 | |
0753f6e0 ZY |
842 | value = 0; |
843 | ret = acpi_read_throttling_status(pr, &value); | |
844 | if (ret >= 0) { | |
ff55a9ce | 845 | state = acpi_get_throttling_state(pr, value); |
4973b22a | 846 | if (state == -1) { |
bdf57de4 FP |
847 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
848 | "Invalid throttling state, reset\n")); | |
4973b22a | 849 | state = 0; |
2a908002 | 850 | ret = acpi_processor_set_throttling(pr, state, true); |
4973b22a ZR |
851 | if (ret) |
852 | return ret; | |
853 | } | |
01854e69 LY |
854 | pr->throttling.state = state; |
855 | } | |
01854e69 LY |
856 | |
857 | return 0; | |
858 | } | |
859 | ||
01854e69 LY |
860 | static int acpi_processor_get_throttling(struct acpi_processor *pr) |
861 | { | |
2fdf66b4 | 862 | cpumask_var_t saved_mask; |
357dc4c3 ZY |
863 | int ret; |
864 | ||
87654273 ZY |
865 | if (!pr) |
866 | return -EINVAL; | |
867 | ||
868 | if (!pr->flags.throttling) | |
869 | return -ENODEV; | |
2fdf66b4 RR |
870 | |
871 | if (!alloc_cpumask_var(&saved_mask, GFP_KERNEL)) | |
872 | return -ENOMEM; | |
873 | ||
357dc4c3 ZY |
874 | /* |
875 | * Migrate task to the cpu pointed by pr. | |
876 | */ | |
2fdf66b4 RR |
877 | cpumask_copy(saved_mask, ¤t->cpus_allowed); |
878 | /* FIXME: use work_on_cpu() */ | |
daef1f35 ZY |
879 | if (set_cpus_allowed_ptr(current, cpumask_of(pr->id))) { |
880 | /* Can't migrate to the target pr->id CPU. Exit */ | |
881 | free_cpumask_var(saved_mask); | |
882 | return -ENODEV; | |
883 | } | |
357dc4c3 ZY |
884 | ret = pr->throttling.acpi_processor_get_throttling(pr); |
885 | /* restore the previous state */ | |
2fdf66b4 RR |
886 | set_cpus_allowed_ptr(current, saved_mask); |
887 | free_cpumask_var(saved_mask); | |
357dc4c3 ZY |
888 | |
889 | return ret; | |
01854e69 LY |
890 | } |
891 | ||
22cc5019 ZY |
892 | static int acpi_processor_get_fadt_info(struct acpi_processor *pr) |
893 | { | |
894 | int i, step; | |
895 | ||
896 | if (!pr->throttling.address) { | |
897 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n")); | |
898 | return -EINVAL; | |
899 | } else if (!pr->throttling.duty_width) { | |
900 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling states\n")); | |
901 | return -EINVAL; | |
902 | } | |
903 | /* TBD: Support duty_cycle values that span bit 4. */ | |
904 | else if ((pr->throttling.duty_offset + pr->throttling.duty_width) > 4) { | |
905 | printk(KERN_WARNING PREFIX "duty_cycle spans bit 4\n"); | |
906 | return -EINVAL; | |
907 | } | |
908 | ||
909 | pr->throttling.state_count = 1 << acpi_gbl_FADT.duty_width; | |
910 | ||
911 | /* | |
912 | * Compute state values. Note that throttling displays a linear power | |
913 | * performance relationship (at 50% performance the CPU will consume | |
914 | * 50% power). Values are in 1/10th of a percent to preserve accuracy. | |
915 | */ | |
916 | ||
917 | step = (1000 / pr->throttling.state_count); | |
918 | ||
919 | for (i = 0; i < pr->throttling.state_count; i++) { | |
920 | pr->throttling.states[i].performance = 1000 - step * i; | |
921 | pr->throttling.states[i].power = 1000 - step * i; | |
922 | } | |
923 | return 0; | |
924 | } | |
925 | ||
6c5cf8aa | 926 | static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr, |
2a908002 | 927 | int state, bool force) |
1da177e4 | 928 | { |
4be44fcd LB |
929 | u32 value = 0; |
930 | u32 duty_mask = 0; | |
931 | u32 duty_value = 0; | |
1da177e4 | 932 | |
1da177e4 | 933 | if (!pr) |
d550d98d | 934 | return -EINVAL; |
1da177e4 LT |
935 | |
936 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
d550d98d | 937 | return -EINVAL; |
1da177e4 LT |
938 | |
939 | if (!pr->flags.throttling) | |
d550d98d | 940 | return -ENODEV; |
1da177e4 | 941 | |
2a908002 | 942 | if (!force && (state == pr->throttling.state)) |
d550d98d | 943 | return 0; |
1da177e4 | 944 | |
01854e69 LY |
945 | if (state < pr->throttling_platform_limit) |
946 | return -EPERM; | |
1da177e4 LT |
947 | /* |
948 | * Calculate the duty_value and duty_mask. | |
949 | */ | |
950 | if (state) { | |
951 | duty_value = pr->throttling.state_count - state; | |
952 | ||
953 | duty_value <<= pr->throttling.duty_offset; | |
954 | ||
955 | /* Used to clear all duty_value bits */ | |
956 | duty_mask = pr->throttling.state_count - 1; | |
957 | ||
cee324b1 | 958 | duty_mask <<= acpi_gbl_FADT.duty_offset; |
1da177e4 LT |
959 | duty_mask = ~duty_mask; |
960 | } | |
961 | ||
962 | local_irq_disable(); | |
963 | ||
964 | /* | |
965 | * Disable throttling by writing a 0 to bit 4. Note that we must | |
966 | * turn it off before you can change the duty_value. | |
967 | */ | |
968 | value = inl(pr->throttling.address); | |
969 | if (value & 0x10) { | |
970 | value &= 0xFFFFFFEF; | |
971 | outl(value, pr->throttling.address); | |
972 | } | |
973 | ||
974 | /* | |
975 | * Write the new duty_value and then enable throttling. Note | |
976 | * that a state value of 0 leaves throttling disabled. | |
977 | */ | |
978 | if (state) { | |
979 | value &= duty_mask; | |
980 | value |= duty_value; | |
981 | outl(value, pr->throttling.address); | |
982 | ||
983 | value |= 0x00000010; | |
984 | outl(value, pr->throttling.address); | |
985 | } | |
986 | ||
987 | pr->throttling.state = state; | |
988 | ||
989 | local_irq_enable(); | |
990 | ||
991 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
992 | "Throttling state set to T%d (%d%%)\n", state, |
993 | (pr->throttling.states[state].performance ? pr-> | |
994 | throttling.states[state].performance / 10 : 0))); | |
1da177e4 | 995 | |
d550d98d | 996 | return 0; |
1da177e4 LT |
997 | } |
998 | ||
6c5cf8aa | 999 | static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr, |
2a908002 | 1000 | int state, bool force) |
01854e69 | 1001 | { |
0753f6e0 | 1002 | int ret; |
439913ff | 1003 | u64 value; |
01854e69 LY |
1004 | |
1005 | if (!pr) | |
1006 | return -EINVAL; | |
1007 | ||
1008 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
1009 | return -EINVAL; | |
1010 | ||
1011 | if (!pr->flags.throttling) | |
1012 | return -ENODEV; | |
1013 | ||
2a908002 | 1014 | if (!force && (state == pr->throttling.state)) |
01854e69 LY |
1015 | return 0; |
1016 | ||
1017 | if (state < pr->throttling_platform_limit) | |
1018 | return -EPERM; | |
1019 | ||
0753f6e0 ZY |
1020 | value = 0; |
1021 | ret = acpi_get_throttling_value(pr, state, &value); | |
1022 | if (ret >= 0) { | |
1023 | acpi_write_throttling_state(pr, value); | |
01854e69 LY |
1024 | pr->throttling.state = state; |
1025 | } | |
01854e69 LY |
1026 | |
1027 | return 0; | |
1028 | } | |
1029 | ||
2a908002 FP |
1030 | int acpi_processor_set_throttling(struct acpi_processor *pr, |
1031 | int state, bool force) | |
01854e69 | 1032 | { |
2fdf66b4 | 1033 | cpumask_var_t saved_mask; |
3391a76f | 1034 | int ret = 0; |
33a2a529 ZY |
1035 | unsigned int i; |
1036 | struct acpi_processor *match_pr; | |
1037 | struct acpi_processor_throttling *p_throttling; | |
1038 | struct throttling_tstate t_state; | |
2fdf66b4 | 1039 | cpumask_var_t online_throttling_cpus; |
87654273 ZY |
1040 | |
1041 | if (!pr) | |
1042 | return -EINVAL; | |
1043 | ||
1044 | if (!pr->flags.throttling) | |
1045 | return -ENODEV; | |
1046 | ||
1047 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
1048 | return -EINVAL; | |
1049 | ||
2fdf66b4 RR |
1050 | if (!alloc_cpumask_var(&saved_mask, GFP_KERNEL)) |
1051 | return -ENOMEM; | |
1052 | ||
1053 | if (!alloc_cpumask_var(&online_throttling_cpus, GFP_KERNEL)) { | |
1054 | free_cpumask_var(saved_mask); | |
1055 | return -ENOMEM; | |
1056 | } | |
1057 | ||
daef1f35 ZY |
1058 | if (cpu_is_offline(pr->id)) { |
1059 | /* | |
1060 | * the cpu pointed by pr->id is offline. Unnecessary to change | |
1061 | * the throttling state any more. | |
1062 | */ | |
1063 | return -ENODEV; | |
1064 | } | |
1065 | ||
2fdf66b4 | 1066 | cpumask_copy(saved_mask, ¤t->cpus_allowed); |
33a2a529 ZY |
1067 | t_state.target_state = state; |
1068 | p_throttling = &(pr->throttling); | |
2fdf66b4 RR |
1069 | cpumask_and(online_throttling_cpus, cpu_online_mask, |
1070 | p_throttling->shared_cpu_map); | |
357dc4c3 | 1071 | /* |
33a2a529 ZY |
1072 | * The throttling notifier will be called for every |
1073 | * affected cpu in order to get one proper T-state. | |
1074 | * The notifier event is THROTTLING_PRECHANGE. | |
357dc4c3 | 1075 | */ |
2fdf66b4 | 1076 | for_each_cpu(i, online_throttling_cpus) { |
33a2a529 ZY |
1077 | t_state.cpu = i; |
1078 | acpi_processor_throttling_notifier(THROTTLING_PRECHANGE, | |
1079 | &t_state); | |
1080 | } | |
1081 | /* | |
1082 | * The function of acpi_processor_set_throttling will be called | |
1083 | * to switch T-state. If the coordination type is SW_ALL or HW_ALL, | |
1084 | * it is necessary to call it for every affected cpu. Otherwise | |
1085 | * it can be called only for the cpu pointed by pr. | |
1086 | */ | |
1087 | if (p_throttling->shared_type == DOMAIN_COORD_TYPE_SW_ANY) { | |
2fdf66b4 | 1088 | /* FIXME: use work_on_cpu() */ |
daef1f35 ZY |
1089 | if (set_cpus_allowed_ptr(current, cpumask_of(pr->id))) { |
1090 | /* Can't migrate to the pr->id CPU. Exit */ | |
1091 | ret = -ENODEV; | |
1092 | goto exit; | |
1093 | } | |
33a2a529 | 1094 | ret = p_throttling->acpi_processor_set_throttling(pr, |
2a908002 | 1095 | t_state.target_state, force); |
33a2a529 ZY |
1096 | } else { |
1097 | /* | |
1098 | * When the T-state coordination is SW_ALL or HW_ALL, | |
1099 | * it is necessary to set T-state for every affected | |
1100 | * cpus. | |
1101 | */ | |
2fdf66b4 | 1102 | for_each_cpu(i, online_throttling_cpus) { |
706546d0 | 1103 | match_pr = per_cpu(processors, i); |
33a2a529 ZY |
1104 | /* |
1105 | * If the pointer is invalid, we will report the | |
1106 | * error message and continue. | |
1107 | */ | |
1108 | if (!match_pr) { | |
1109 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
1110 | "Invalid Pointer for CPU %d\n", i)); | |
1111 | continue; | |
1112 | } | |
1113 | /* | |
1114 | * If the throttling control is unsupported on CPU i, | |
1115 | * we will report the error message and continue. | |
1116 | */ | |
1117 | if (!match_pr->flags.throttling) { | |
1118 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
1119 | "Throttling Controll is unsupported " | |
1120 | "on CPU %d\n", i)); | |
1121 | continue; | |
1122 | } | |
1123 | t_state.cpu = i; | |
2fdf66b4 | 1124 | /* FIXME: use work_on_cpu() */ |
daef1f35 ZY |
1125 | if (set_cpus_allowed_ptr(current, cpumask_of(i))) |
1126 | continue; | |
33a2a529 ZY |
1127 | ret = match_pr->throttling. |
1128 | acpi_processor_set_throttling( | |
2a908002 | 1129 | match_pr, t_state.target_state, force); |
33a2a529 ZY |
1130 | } |
1131 | } | |
1132 | /* | |
1133 | * After the set_throttling is called, the | |
1134 | * throttling notifier is called for every | |
1135 | * affected cpu to update the T-states. | |
1136 | * The notifier event is THROTTLING_POSTCHANGE | |
1137 | */ | |
2fdf66b4 | 1138 | for_each_cpu(i, online_throttling_cpus) { |
33a2a529 ZY |
1139 | t_state.cpu = i; |
1140 | acpi_processor_throttling_notifier(THROTTLING_POSTCHANGE, | |
1141 | &t_state); | |
1142 | } | |
357dc4c3 | 1143 | /* restore the previous state */ |
2fdf66b4 RR |
1144 | /* FIXME: use work_on_cpu() */ |
1145 | set_cpus_allowed_ptr(current, saved_mask); | |
daef1f35 | 1146 | exit: |
2fdf66b4 RR |
1147 | free_cpumask_var(online_throttling_cpus); |
1148 | free_cpumask_var(saved_mask); | |
357dc4c3 | 1149 | return ret; |
01854e69 LY |
1150 | } |
1151 | ||
4be44fcd | 1152 | int acpi_processor_get_throttling_info(struct acpi_processor *pr) |
1da177e4 | 1153 | { |
4be44fcd | 1154 | int result = 0; |
1180509f | 1155 | struct acpi_processor_throttling *pthrottling; |
1da177e4 | 1156 | |
1da177e4 | 1157 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
1158 | "pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n", |
1159 | pr->throttling.address, | |
1160 | pr->throttling.duty_offset, | |
1161 | pr->throttling.duty_width)); | |
1da177e4 | 1162 | |
c30c620e LB |
1163 | /* |
1164 | * Evaluate _PTC, _TSS and _TPC | |
1165 | * They must all be present or none of them can be used. | |
1166 | */ | |
1167 | if (acpi_processor_get_throttling_control(pr) || | |
1168 | acpi_processor_get_throttling_states(pr) || | |
1169 | acpi_processor_get_platform_limit(pr)) | |
1170 | { | |
ff55a9ce LB |
1171 | pr->throttling.acpi_processor_get_throttling = |
1172 | &acpi_processor_get_throttling_fadt; | |
1173 | pr->throttling.acpi_processor_set_throttling = | |
1174 | &acpi_processor_set_throttling_fadt; | |
d1154be3 AS |
1175 | if (acpi_processor_get_fadt_info(pr)) |
1176 | return 0; | |
01854e69 | 1177 | } else { |
ff55a9ce LB |
1178 | pr->throttling.acpi_processor_get_throttling = |
1179 | &acpi_processor_get_throttling_ptc; | |
1180 | pr->throttling.acpi_processor_set_throttling = | |
1181 | &acpi_processor_set_throttling_ptc; | |
01854e69 | 1182 | } |
1da177e4 | 1183 | |
1180509f ZY |
1184 | /* |
1185 | * If TSD package for one CPU can't be parsed successfully, it means | |
1186 | * that this CPU will have no coordination with other CPUs. | |
1187 | */ | |
1188 | if (acpi_processor_get_tsd(pr)) { | |
1189 | pthrottling = &pr->throttling; | |
1190 | pthrottling->tsd_valid_flag = 0; | |
2fdf66b4 | 1191 | cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map); |
1180509f ZY |
1192 | pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL; |
1193 | } | |
c30c620e | 1194 | |
1da177e4 LT |
1195 | /* |
1196 | * PIIX4 Errata: We don't support throttling on the original PIIX4. | |
1197 | * This shouldn't be an issue as few (if any) mobile systems ever | |
1198 | * used this part. | |
1199 | */ | |
1200 | if (errata.piix4.throttle) { | |
1201 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 1202 | "Throttling not supported on PIIX4 A- or B-step\n")); |
d550d98d | 1203 | return 0; |
1da177e4 LT |
1204 | } |
1205 | ||
1da177e4 | 1206 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", |
4be44fcd | 1207 | pr->throttling.state_count)); |
1da177e4 LT |
1208 | |
1209 | pr->flags.throttling = 1; | |
1210 | ||
1211 | /* | |
1212 | * Disable throttling (if enabled). We'll let subsequent policy (e.g. | |
1213 | * thermal) decide to lower performance if it so chooses, but for now | |
1214 | * we'll crank up the speed. | |
1215 | */ | |
1216 | ||
1217 | result = acpi_processor_get_throttling(pr); | |
1218 | if (result) | |
1219 | goto end; | |
1220 | ||
1221 | if (pr->throttling.state) { | |
4be44fcd LB |
1222 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
1223 | "Disabling throttling (was T%d)\n", | |
1224 | pr->throttling.state)); | |
2a908002 | 1225 | result = acpi_processor_set_throttling(pr, 0, false); |
1da177e4 LT |
1226 | if (result) |
1227 | goto end; | |
1228 | } | |
1229 | ||
4be44fcd | 1230 | end: |
1da177e4 LT |
1231 | if (result) |
1232 | pr->flags.throttling = 0; | |
1233 | ||
d550d98d | 1234 | return result; |
1da177e4 LT |
1235 | } |
1236 | ||
d5c6887c | 1237 | #ifdef CONFIG_ACPI_PROCFS |
1da177e4 | 1238 | /* proc interface */ |
4be44fcd LB |
1239 | static int acpi_processor_throttling_seq_show(struct seq_file *seq, |
1240 | void *offset) | |
1da177e4 | 1241 | { |
50dd0969 | 1242 | struct acpi_processor *pr = seq->private; |
4be44fcd LB |
1243 | int i = 0; |
1244 | int result = 0; | |
1da177e4 | 1245 | |
1da177e4 LT |
1246 | if (!pr) |
1247 | goto end; | |
1248 | ||
1249 | if (!(pr->throttling.state_count > 0)) { | |
1250 | seq_puts(seq, "<not supported>\n"); | |
1251 | goto end; | |
1252 | } | |
1253 | ||
1254 | result = acpi_processor_get_throttling(pr); | |
1255 | ||
1256 | if (result) { | |
4be44fcd LB |
1257 | seq_puts(seq, |
1258 | "Could not determine current throttling state.\n"); | |
1da177e4 LT |
1259 | goto end; |
1260 | } | |
1261 | ||
1262 | seq_printf(seq, "state count: %d\n" | |
01854e69 | 1263 | "active state: T%d\n" |
ff55a9ce | 1264 | "state available: T%d to T%d\n", |
01854e69 | 1265 | pr->throttling.state_count, pr->throttling.state, |
ff55a9ce LB |
1266 | pr->throttling_platform_limit, |
1267 | pr->throttling.state_count - 1); | |
1da177e4 LT |
1268 | |
1269 | seq_puts(seq, "states:\n"); | |
3cc2649b LY |
1270 | if (pr->throttling.acpi_processor_get_throttling == |
1271 | acpi_processor_get_throttling_fadt) { | |
01854e69 LY |
1272 | for (i = 0; i < pr->throttling.state_count; i++) |
1273 | seq_printf(seq, " %cT%d: %02d%%\n", | |
ff55a9ce LB |
1274 | (i == pr->throttling.state ? '*' : ' '), i, |
1275 | (pr->throttling.states[i].performance ? pr-> | |
1276 | throttling.states[i].performance / 10 : 0)); | |
3cc2649b | 1277 | } else { |
01854e69 LY |
1278 | for (i = 0; i < pr->throttling.state_count; i++) |
1279 | seq_printf(seq, " %cT%d: %02d%%\n", | |
ff55a9ce LB |
1280 | (i == pr->throttling.state ? '*' : ' '), i, |
1281 | (int)pr->throttling.states_tss[i]. | |
1282 | freqpercentage); | |
3cc2649b | 1283 | } |
1da177e4 | 1284 | |
4be44fcd | 1285 | end: |
d550d98d | 1286 | return 0; |
1da177e4 LT |
1287 | } |
1288 | ||
4be44fcd LB |
1289 | static int acpi_processor_throttling_open_fs(struct inode *inode, |
1290 | struct file *file) | |
1da177e4 LT |
1291 | { |
1292 | return single_open(file, acpi_processor_throttling_seq_show, | |
4be44fcd | 1293 | PDE(inode)->data); |
1da177e4 LT |
1294 | } |
1295 | ||
ff55a9ce | 1296 | static ssize_t acpi_processor_write_throttling(struct file *file, |
757b1866 AB |
1297 | const char __user * buffer, |
1298 | size_t count, loff_t * data) | |
1da177e4 | 1299 | { |
4be44fcd | 1300 | int result = 0; |
50dd0969 JE |
1301 | struct seq_file *m = file->private_data; |
1302 | struct acpi_processor *pr = m->private; | |
3d532d5e YY |
1303 | char state_string[5] = ""; |
1304 | char *charp = NULL; | |
1305 | size_t state_val = 0; | |
1306 | char tmpbuf[5] = ""; | |
1da177e4 | 1307 | |
1da177e4 | 1308 | if (!pr || (count > sizeof(state_string) - 1)) |
d550d98d | 1309 | return -EINVAL; |
1da177e4 LT |
1310 | |
1311 | if (copy_from_user(state_string, buffer, count)) | |
d550d98d | 1312 | return -EFAULT; |
1da177e4 LT |
1313 | |
1314 | state_string[count] = '\0'; | |
3d532d5e YY |
1315 | if ((count > 0) && (state_string[count-1] == '\n')) |
1316 | state_string[count-1] = '\0'; | |
1da177e4 | 1317 | |
3d532d5e YY |
1318 | charp = state_string; |
1319 | if ((state_string[0] == 't') || (state_string[0] == 'T')) | |
1320 | charp++; | |
1321 | ||
1322 | state_val = simple_strtoul(charp, NULL, 0); | |
1323 | if (state_val >= pr->throttling.state_count) | |
1324 | return -EINVAL; | |
1325 | ||
12b2b34e | 1326 | snprintf(tmpbuf, 5, "%zu", state_val); |
3d532d5e YY |
1327 | |
1328 | if (strcmp(tmpbuf, charp) != 0) | |
1329 | return -EINVAL; | |
1330 | ||
2a908002 | 1331 | result = acpi_processor_set_throttling(pr, state_val, false); |
1da177e4 | 1332 | if (result) |
d550d98d | 1333 | return result; |
1da177e4 | 1334 | |
d550d98d | 1335 | return count; |
1da177e4 LT |
1336 | } |
1337 | ||
070d8eb1 | 1338 | const struct file_operations acpi_processor_throttling_fops = { |
cf7acfab | 1339 | .owner = THIS_MODULE, |
4be44fcd LB |
1340 | .open = acpi_processor_throttling_open_fs, |
1341 | .read = seq_read, | |
d479e908 | 1342 | .write = acpi_processor_write_throttling, |
4be44fcd LB |
1343 | .llseek = seq_lseek, |
1344 | .release = single_release, | |
1da177e4 | 1345 | }; |
d5c6887c | 1346 | #endif |