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> | |
31 | #include <linux/init.h> | |
32 | #include <linux/cpufreq.h> | |
33 | #include <linux/proc_fs.h> | |
34 | #include <linux/seq_file.h> | |
35 | ||
36 | #include <asm/io.h> | |
37 | #include <asm/uaccess.h> | |
38 | ||
39 | #include <acpi/acpi_bus.h> | |
40 | #include <acpi/processor.h> | |
41 | ||
42 | #define ACPI_PROCESSOR_COMPONENT 0x01000000 | |
43 | #define ACPI_PROCESSOR_CLASS "processor" | |
1da177e4 | 44 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
f52fd66d | 45 | ACPI_MODULE_NAME("processor_throttling"); |
1da177e4 | 46 | |
ff55a9ce LB |
47 | static int acpi_processor_get_throttling(struct acpi_processor *pr); |
48 | int acpi_processor_set_throttling(struct acpi_processor *pr, int state); | |
01854e69 | 49 | |
c30c620e LB |
50 | /* |
51 | * _TPC - Throttling Present Capabilities | |
52 | */ | |
01854e69 LY |
53 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
54 | { | |
55 | acpi_status status = 0; | |
56 | unsigned long tpc = 0; | |
57 | ||
ff55a9ce | 58 | if (!pr) |
01854e69 LY |
59 | return -EINVAL; |
60 | status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc); | |
c30c620e LB |
61 | if (ACPI_FAILURE(status)) { |
62 | if (status != AE_NOT_FOUND) { | |
63 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TPC")); | |
64 | } | |
01854e69 LY |
65 | return -ENODEV; |
66 | } | |
67 | pr->throttling_platform_limit = (int)tpc; | |
68 | return 0; | |
69 | } | |
70 | ||
71 | int acpi_processor_tstate_has_changed(struct acpi_processor *pr) | |
72 | { | |
ef54d5ad ZY |
73 | int result = 0; |
74 | int throttling_limit; | |
75 | int current_state; | |
76 | struct acpi_processor_limit *limit; | |
77 | int target_state; | |
78 | ||
79 | result = acpi_processor_get_platform_limit(pr); | |
80 | if (result) { | |
81 | /* Throttling Limit is unsupported */ | |
82 | return result; | |
83 | } | |
84 | ||
85 | throttling_limit = pr->throttling_platform_limit; | |
86 | if (throttling_limit >= pr->throttling.state_count) { | |
87 | /* Uncorrect Throttling Limit */ | |
88 | return -EINVAL; | |
89 | } | |
90 | ||
91 | current_state = pr->throttling.state; | |
92 | if (current_state > throttling_limit) { | |
93 | /* | |
94 | * The current state can meet the requirement of | |
95 | * _TPC limit. But it is reasonable that OSPM changes | |
96 | * t-states from high to low for better performance. | |
97 | * Of course the limit condition of thermal | |
98 | * and user should be considered. | |
99 | */ | |
100 | limit = &pr->limit; | |
101 | target_state = throttling_limit; | |
102 | if (limit->thermal.tx > target_state) | |
103 | target_state = limit->thermal.tx; | |
104 | if (limit->user.tx > target_state) | |
105 | target_state = limit->user.tx; | |
106 | } else if (current_state == throttling_limit) { | |
107 | /* | |
108 | * Unnecessary to change the throttling state | |
109 | */ | |
110 | return 0; | |
111 | } else { | |
112 | /* | |
113 | * If the current state is lower than the limit of _TPC, it | |
114 | * will be forced to switch to the throttling state defined | |
115 | * by throttling_platfor_limit. | |
116 | * Because the previous state meets with the limit condition | |
117 | * of thermal and user, it is unnecessary to check it again. | |
118 | */ | |
119 | target_state = throttling_limit; | |
120 | } | |
121 | return acpi_processor_set_throttling(pr, target_state); | |
01854e69 LY |
122 | } |
123 | ||
c30c620e LB |
124 | /* |
125 | * _PTC - Processor Throttling Control (and status) register location | |
126 | */ | |
01854e69 LY |
127 | static int acpi_processor_get_throttling_control(struct acpi_processor *pr) |
128 | { | |
129 | int result = 0; | |
130 | acpi_status status = 0; | |
131 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
132 | union acpi_object *ptc = NULL; | |
133 | union acpi_object obj = { 0 }; | |
134 | ||
135 | status = acpi_evaluate_object(pr->handle, "_PTC", NULL, &buffer); | |
136 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
137 | if (status != AE_NOT_FOUND) { |
138 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTC")); | |
139 | } | |
01854e69 LY |
140 | return -ENODEV; |
141 | } | |
142 | ||
143 | ptc = (union acpi_object *)buffer.pointer; | |
144 | if (!ptc || (ptc->type != ACPI_TYPE_PACKAGE) | |
145 | || (ptc->package.count != 2)) { | |
146 | printk(KERN_ERR PREFIX "Invalid _PTC data\n"); | |
147 | result = -EFAULT; | |
148 | goto end; | |
149 | } | |
150 | ||
151 | /* | |
152 | * control_register | |
153 | */ | |
154 | ||
155 | obj = ptc->package.elements[0]; | |
156 | ||
157 | if ((obj.type != ACPI_TYPE_BUFFER) | |
158 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) | |
159 | || (obj.buffer.pointer == NULL)) { | |
ff55a9ce LB |
160 | printk(KERN_ERR PREFIX |
161 | "Invalid _PTC data (control_register)\n"); | |
01854e69 LY |
162 | result = -EFAULT; |
163 | goto end; | |
164 | } | |
165 | memcpy(&pr->throttling.control_register, obj.buffer.pointer, | |
166 | sizeof(struct acpi_ptc_register)); | |
167 | ||
168 | /* | |
169 | * status_register | |
170 | */ | |
171 | ||
172 | obj = ptc->package.elements[1]; | |
173 | ||
174 | if ((obj.type != ACPI_TYPE_BUFFER) | |
175 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) | |
176 | || (obj.buffer.pointer == NULL)) { | |
177 | printk(KERN_ERR PREFIX "Invalid _PTC data (status_register)\n"); | |
178 | result = -EFAULT; | |
179 | goto end; | |
180 | } | |
181 | ||
182 | memcpy(&pr->throttling.status_register, obj.buffer.pointer, | |
ff55a9ce | 183 | sizeof(struct acpi_ptc_register)); |
01854e69 | 184 | |
ff55a9ce | 185 | end: |
01854e69 LY |
186 | kfree(buffer.pointer); |
187 | ||
188 | return result; | |
189 | } | |
c30c620e LB |
190 | |
191 | /* | |
192 | * _TSS - Throttling Supported States | |
193 | */ | |
01854e69 LY |
194 | static int acpi_processor_get_throttling_states(struct acpi_processor *pr) |
195 | { | |
196 | int result = 0; | |
197 | acpi_status status = AE_OK; | |
198 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
199 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
200 | struct acpi_buffer state = { 0, NULL }; | |
201 | union acpi_object *tss = NULL; | |
202 | int i; | |
203 | ||
204 | status = acpi_evaluate_object(pr->handle, "_TSS", NULL, &buffer); | |
205 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
206 | if (status != AE_NOT_FOUND) { |
207 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSS")); | |
208 | } | |
01854e69 LY |
209 | return -ENODEV; |
210 | } | |
211 | ||
212 | tss = buffer.pointer; | |
213 | if (!tss || (tss->type != ACPI_TYPE_PACKAGE)) { | |
214 | printk(KERN_ERR PREFIX "Invalid _TSS data\n"); | |
215 | result = -EFAULT; | |
216 | goto end; | |
217 | } | |
218 | ||
219 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", | |
220 | tss->package.count)); | |
221 | ||
222 | pr->throttling.state_count = tss->package.count; | |
223 | pr->throttling.states_tss = | |
224 | kmalloc(sizeof(struct acpi_processor_tx_tss) * tss->package.count, | |
225 | GFP_KERNEL); | |
226 | if (!pr->throttling.states_tss) { | |
227 | result = -ENOMEM; | |
228 | goto end; | |
229 | } | |
230 | ||
231 | for (i = 0; i < pr->throttling.state_count; i++) { | |
232 | ||
ff55a9ce LB |
233 | struct acpi_processor_tx_tss *tx = |
234 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
235 | states_tss[i]); | |
01854e69 LY |
236 | |
237 | state.length = sizeof(struct acpi_processor_tx_tss); | |
238 | state.pointer = tx; | |
239 | ||
240 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
241 | ||
242 | status = acpi_extract_package(&(tss->package.elements[i]), | |
243 | &format, &state); | |
244 | if (ACPI_FAILURE(status)) { | |
245 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _TSS data")); | |
246 | result = -EFAULT; | |
247 | kfree(pr->throttling.states_tss); | |
248 | goto end; | |
249 | } | |
250 | ||
251 | if (!tx->freqpercentage) { | |
252 | printk(KERN_ERR PREFIX | |
ff55a9ce | 253 | "Invalid _TSS data: freq is zero\n"); |
01854e69 LY |
254 | result = -EFAULT; |
255 | kfree(pr->throttling.states_tss); | |
256 | goto end; | |
257 | } | |
258 | } | |
259 | ||
260 | end: | |
261 | kfree(buffer.pointer); | |
262 | ||
263 | return result; | |
264 | } | |
c30c620e LB |
265 | |
266 | /* | |
267 | * _TSD - T-State Dependencies | |
268 | */ | |
ff55a9ce | 269 | static int acpi_processor_get_tsd(struct acpi_processor *pr) |
01854e69 LY |
270 | { |
271 | int result = 0; | |
272 | acpi_status status = AE_OK; | |
ff55a9ce LB |
273 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
274 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
275 | struct acpi_buffer state = { 0, NULL }; | |
276 | union acpi_object *tsd = NULL; | |
01854e69 LY |
277 | struct acpi_tsd_package *pdomain; |
278 | ||
279 | status = acpi_evaluate_object(pr->handle, "_TSD", NULL, &buffer); | |
280 | if (ACPI_FAILURE(status)) { | |
c30c620e LB |
281 | if (status != AE_NOT_FOUND) { |
282 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSD")); | |
283 | } | |
01854e69 LY |
284 | return -ENODEV; |
285 | } | |
286 | ||
287 | tsd = buffer.pointer; | |
288 | if (!tsd || (tsd->type != ACPI_TYPE_PACKAGE)) { | |
289 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _TSD data\n")); | |
290 | result = -EFAULT; | |
291 | goto end; | |
292 | } | |
293 | ||
294 | if (tsd->package.count != 1) { | |
295 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _TSD data\n")); | |
296 | result = -EFAULT; | |
297 | goto end; | |
298 | } | |
299 | ||
300 | pdomain = &(pr->throttling.domain_info); | |
301 | ||
302 | state.length = sizeof(struct acpi_tsd_package); | |
303 | state.pointer = pdomain; | |
304 | ||
305 | status = acpi_extract_package(&(tsd->package.elements[0]), | |
ff55a9ce | 306 | &format, &state); |
01854e69 LY |
307 | if (ACPI_FAILURE(status)) { |
308 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _TSD data\n")); | |
309 | result = -EFAULT; | |
310 | goto end; | |
311 | } | |
312 | ||
313 | if (pdomain->num_entries != ACPI_TSD_REV0_ENTRIES) { | |
314 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _TSD:num_entries\n")); | |
315 | result = -EFAULT; | |
316 | goto end; | |
317 | } | |
318 | ||
319 | if (pdomain->revision != ACPI_TSD_REV0_REVISION) { | |
320 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _TSD:revision\n")); | |
321 | result = -EFAULT; | |
322 | goto end; | |
323 | } | |
324 | ||
ff55a9ce | 325 | end: |
01854e69 LY |
326 | kfree(buffer.pointer); |
327 | return result; | |
328 | } | |
329 | ||
1da177e4 LT |
330 | /* -------------------------------------------------------------------------- |
331 | Throttling Control | |
332 | -------------------------------------------------------------------------- */ | |
01854e69 | 333 | static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr) |
1da177e4 | 334 | { |
4be44fcd LB |
335 | int state = 0; |
336 | u32 value = 0; | |
337 | u32 duty_mask = 0; | |
338 | u32 duty_value = 0; | |
1da177e4 | 339 | |
1da177e4 | 340 | if (!pr) |
d550d98d | 341 | return -EINVAL; |
1da177e4 LT |
342 | |
343 | if (!pr->flags.throttling) | |
d550d98d | 344 | return -ENODEV; |
1da177e4 LT |
345 | |
346 | pr->throttling.state = 0; | |
347 | ||
348 | duty_mask = pr->throttling.state_count - 1; | |
349 | ||
350 | duty_mask <<= pr->throttling.duty_offset; | |
351 | ||
352 | local_irq_disable(); | |
353 | ||
354 | value = inl(pr->throttling.address); | |
355 | ||
356 | /* | |
357 | * Compute the current throttling state when throttling is enabled | |
358 | * (bit 4 is on). | |
359 | */ | |
360 | if (value & 0x10) { | |
361 | duty_value = value & duty_mask; | |
362 | duty_value >>= pr->throttling.duty_offset; | |
363 | ||
364 | if (duty_value) | |
4be44fcd | 365 | state = pr->throttling.state_count - duty_value; |
1da177e4 LT |
366 | } |
367 | ||
368 | pr->throttling.state = state; | |
369 | ||
370 | local_irq_enable(); | |
371 | ||
372 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
373 | "Throttling state is T%d (%d%% throttling applied)\n", |
374 | state, pr->throttling.states[state].performance)); | |
1da177e4 | 375 | |
d550d98d | 376 | return 0; |
1da177e4 LT |
377 | } |
378 | ||
0753f6e0 ZY |
379 | static int acpi_read_throttling_status(struct acpi_processor *pr, |
380 | acpi_integer *value) | |
01854e69 | 381 | { |
0753f6e0 ZY |
382 | u64 ptc_value; |
383 | struct acpi_processor_throttling *throttling; | |
384 | int ret = -1; | |
385 | ||
386 | throttling = &pr->throttling; | |
01854e69 LY |
387 | switch (throttling->status_register.space_id) { |
388 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
0753f6e0 | 389 | ptc_value = 0; |
ff55a9ce | 390 | acpi_os_read_port((acpi_io_address) throttling->status_register. |
0753f6e0 | 391 | address, (u32 *) &ptc_value, |
ff55a9ce LB |
392 | (u32) throttling->status_register.bit_width * |
393 | 8); | |
0753f6e0 ZY |
394 | *value = (acpi_integer) ptc_value; |
395 | ret = 0; | |
01854e69 LY |
396 | break; |
397 | case ACPI_ADR_SPACE_FIXED_HARDWARE: | |
ff55a9ce LB |
398 | printk(KERN_ERR PREFIX |
399 | "HARDWARE addr space,NOT supported yet\n"); | |
01854e69 LY |
400 | break; |
401 | default: | |
402 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", | |
ff55a9ce | 403 | (u32) (throttling->status_register.space_id)); |
01854e69 | 404 | } |
0753f6e0 | 405 | return ret; |
01854e69 LY |
406 | } |
407 | ||
0753f6e0 ZY |
408 | static int acpi_write_throttling_state(struct acpi_processor *pr, |
409 | acpi_integer value) | |
01854e69 | 410 | { |
0753f6e0 ZY |
411 | u64 ptc_value; |
412 | struct acpi_processor_throttling *throttling; | |
01854e69 LY |
413 | int ret = -1; |
414 | ||
0753f6e0 | 415 | throttling = &pr->throttling; |
01854e69 LY |
416 | switch (throttling->control_register.space_id) { |
417 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
0753f6e0 | 418 | ptc_value = value; |
ff55a9ce | 419 | acpi_os_write_port((acpi_io_address) throttling-> |
0753f6e0 | 420 | control_register.address, (u32) ptc_value, |
ff55a9ce LB |
421 | (u32) throttling->control_register. |
422 | bit_width * 8); | |
01854e69 LY |
423 | ret = 0; |
424 | break; | |
425 | case ACPI_ADR_SPACE_FIXED_HARDWARE: | |
ff55a9ce LB |
426 | printk(KERN_ERR PREFIX |
427 | "HARDWARE addr space,NOT supported yet\n"); | |
01854e69 LY |
428 | break; |
429 | default: | |
430 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", | |
ff55a9ce | 431 | (u32) (throttling->control_register.space_id)); |
01854e69 LY |
432 | } |
433 | return ret; | |
434 | } | |
435 | ||
0753f6e0 ZY |
436 | static int acpi_get_throttling_state(struct acpi_processor *pr, |
437 | acpi_integer value) | |
01854e69 LY |
438 | { |
439 | int i; | |
440 | ||
441 | for (i = 0; i < pr->throttling.state_count; i++) { | |
ff55a9ce LB |
442 | struct acpi_processor_tx_tss *tx = |
443 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
444 | states_tss[i]); | |
445 | if (tx->control == value) | |
01854e69 LY |
446 | break; |
447 | } | |
ff55a9ce LB |
448 | if (i > pr->throttling.state_count) |
449 | i = -1; | |
01854e69 LY |
450 | return i; |
451 | } | |
452 | ||
0753f6e0 ZY |
453 | static int acpi_get_throttling_value(struct acpi_processor *pr, |
454 | int state, acpi_integer *value) | |
01854e69 | 455 | { |
0753f6e0 ZY |
456 | int ret = -1; |
457 | ||
ff55a9ce LB |
458 | if (state >= 0 && state <= pr->throttling.state_count) { |
459 | struct acpi_processor_tx_tss *tx = | |
460 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
461 | states_tss[state]); | |
0753f6e0 ZY |
462 | *value = tx->control; |
463 | ret = 0; | |
01854e69 | 464 | } |
0753f6e0 | 465 | return ret; |
01854e69 LY |
466 | } |
467 | ||
468 | static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr) | |
469 | { | |
470 | int state = 0; | |
0753f6e0 ZY |
471 | int ret; |
472 | acpi_integer value; | |
01854e69 | 473 | |
01854e69 LY |
474 | if (!pr) |
475 | return -EINVAL; | |
476 | ||
477 | if (!pr->flags.throttling) | |
478 | return -ENODEV; | |
479 | ||
480 | pr->throttling.state = 0; | |
481 | local_irq_disable(); | |
0753f6e0 ZY |
482 | value = 0; |
483 | ret = acpi_read_throttling_status(pr, &value); | |
484 | if (ret >= 0) { | |
ff55a9ce | 485 | state = acpi_get_throttling_state(pr, value); |
01854e69 LY |
486 | pr->throttling.state = state; |
487 | } | |
488 | local_irq_enable(); | |
489 | ||
490 | return 0; | |
491 | } | |
492 | ||
01854e69 LY |
493 | static int acpi_processor_get_throttling(struct acpi_processor *pr) |
494 | { | |
495 | return pr->throttling.acpi_processor_get_throttling(pr); | |
496 | } | |
497 | ||
22cc5019 ZY |
498 | static int acpi_processor_get_fadt_info(struct acpi_processor *pr) |
499 | { | |
500 | int i, step; | |
501 | ||
502 | if (!pr->throttling.address) { | |
503 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n")); | |
504 | return -EINVAL; | |
505 | } else if (!pr->throttling.duty_width) { | |
506 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling states\n")); | |
507 | return -EINVAL; | |
508 | } | |
509 | /* TBD: Support duty_cycle values that span bit 4. */ | |
510 | else if ((pr->throttling.duty_offset + pr->throttling.duty_width) > 4) { | |
511 | printk(KERN_WARNING PREFIX "duty_cycle spans bit 4\n"); | |
512 | return -EINVAL; | |
513 | } | |
514 | ||
515 | pr->throttling.state_count = 1 << acpi_gbl_FADT.duty_width; | |
516 | ||
517 | /* | |
518 | * Compute state values. Note that throttling displays a linear power | |
519 | * performance relationship (at 50% performance the CPU will consume | |
520 | * 50% power). Values are in 1/10th of a percent to preserve accuracy. | |
521 | */ | |
522 | ||
523 | step = (1000 / pr->throttling.state_count); | |
524 | ||
525 | for (i = 0; i < pr->throttling.state_count; i++) { | |
526 | pr->throttling.states[i].performance = 1000 - step * i; | |
527 | pr->throttling.states[i].power = 1000 - step * i; | |
528 | } | |
529 | return 0; | |
530 | } | |
531 | ||
6c5cf8aa AB |
532 | static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr, |
533 | int state) | |
1da177e4 | 534 | { |
4be44fcd LB |
535 | u32 value = 0; |
536 | u32 duty_mask = 0; | |
537 | u32 duty_value = 0; | |
1da177e4 | 538 | |
1da177e4 | 539 | if (!pr) |
d550d98d | 540 | return -EINVAL; |
1da177e4 LT |
541 | |
542 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
d550d98d | 543 | return -EINVAL; |
1da177e4 LT |
544 | |
545 | if (!pr->flags.throttling) | |
d550d98d | 546 | return -ENODEV; |
1da177e4 LT |
547 | |
548 | if (state == pr->throttling.state) | |
d550d98d | 549 | return 0; |
1da177e4 | 550 | |
01854e69 LY |
551 | if (state < pr->throttling_platform_limit) |
552 | return -EPERM; | |
1da177e4 LT |
553 | /* |
554 | * Calculate the duty_value and duty_mask. | |
555 | */ | |
556 | if (state) { | |
557 | duty_value = pr->throttling.state_count - state; | |
558 | ||
559 | duty_value <<= pr->throttling.duty_offset; | |
560 | ||
561 | /* Used to clear all duty_value bits */ | |
562 | duty_mask = pr->throttling.state_count - 1; | |
563 | ||
cee324b1 | 564 | duty_mask <<= acpi_gbl_FADT.duty_offset; |
1da177e4 LT |
565 | duty_mask = ~duty_mask; |
566 | } | |
567 | ||
568 | local_irq_disable(); | |
569 | ||
570 | /* | |
571 | * Disable throttling by writing a 0 to bit 4. Note that we must | |
572 | * turn it off before you can change the duty_value. | |
573 | */ | |
574 | value = inl(pr->throttling.address); | |
575 | if (value & 0x10) { | |
576 | value &= 0xFFFFFFEF; | |
577 | outl(value, pr->throttling.address); | |
578 | } | |
579 | ||
580 | /* | |
581 | * Write the new duty_value and then enable throttling. Note | |
582 | * that a state value of 0 leaves throttling disabled. | |
583 | */ | |
584 | if (state) { | |
585 | value &= duty_mask; | |
586 | value |= duty_value; | |
587 | outl(value, pr->throttling.address); | |
588 | ||
589 | value |= 0x00000010; | |
590 | outl(value, pr->throttling.address); | |
591 | } | |
592 | ||
593 | pr->throttling.state = state; | |
594 | ||
595 | local_irq_enable(); | |
596 | ||
597 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
598 | "Throttling state set to T%d (%d%%)\n", state, |
599 | (pr->throttling.states[state].performance ? pr-> | |
600 | throttling.states[state].performance / 10 : 0))); | |
1da177e4 | 601 | |
d550d98d | 602 | return 0; |
1da177e4 LT |
603 | } |
604 | ||
6c5cf8aa AB |
605 | static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr, |
606 | int state) | |
01854e69 | 607 | { |
0753f6e0 ZY |
608 | int ret; |
609 | acpi_integer value; | |
01854e69 LY |
610 | |
611 | if (!pr) | |
612 | return -EINVAL; | |
613 | ||
614 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
615 | return -EINVAL; | |
616 | ||
617 | if (!pr->flags.throttling) | |
618 | return -ENODEV; | |
619 | ||
620 | if (state == pr->throttling.state) | |
621 | return 0; | |
622 | ||
623 | if (state < pr->throttling_platform_limit) | |
624 | return -EPERM; | |
625 | ||
626 | local_irq_disable(); | |
0753f6e0 ZY |
627 | value = 0; |
628 | ret = acpi_get_throttling_value(pr, state, &value); | |
629 | if (ret >= 0) { | |
630 | acpi_write_throttling_state(pr, value); | |
01854e69 LY |
631 | pr->throttling.state = state; |
632 | } | |
633 | local_irq_enable(); | |
634 | ||
635 | return 0; | |
636 | } | |
637 | ||
638 | int acpi_processor_set_throttling(struct acpi_processor *pr, int state) | |
639 | { | |
ff55a9ce | 640 | return pr->throttling.acpi_processor_set_throttling(pr, state); |
01854e69 LY |
641 | } |
642 | ||
4be44fcd | 643 | int acpi_processor_get_throttling_info(struct acpi_processor *pr) |
1da177e4 | 644 | { |
4be44fcd | 645 | int result = 0; |
1da177e4 | 646 | |
1da177e4 | 647 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
648 | "pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n", |
649 | pr->throttling.address, | |
650 | pr->throttling.duty_offset, | |
651 | pr->throttling.duty_width)); | |
1da177e4 LT |
652 | |
653 | if (!pr) | |
d550d98d | 654 | return -EINVAL; |
1da177e4 | 655 | |
c30c620e LB |
656 | /* |
657 | * Evaluate _PTC, _TSS and _TPC | |
658 | * They must all be present or none of them can be used. | |
659 | */ | |
660 | if (acpi_processor_get_throttling_control(pr) || | |
661 | acpi_processor_get_throttling_states(pr) || | |
662 | acpi_processor_get_platform_limit(pr)) | |
663 | { | |
22cc5019 ZY |
664 | if (acpi_processor_get_fadt_info(pr)) |
665 | return 0; | |
ff55a9ce LB |
666 | pr->throttling.acpi_processor_get_throttling = |
667 | &acpi_processor_get_throttling_fadt; | |
668 | pr->throttling.acpi_processor_set_throttling = | |
669 | &acpi_processor_set_throttling_fadt; | |
01854e69 | 670 | } else { |
ff55a9ce LB |
671 | pr->throttling.acpi_processor_get_throttling = |
672 | &acpi_processor_get_throttling_ptc; | |
673 | pr->throttling.acpi_processor_set_throttling = | |
674 | &acpi_processor_set_throttling_ptc; | |
01854e69 | 675 | } |
1da177e4 | 676 | |
c30c620e LB |
677 | acpi_processor_get_tsd(pr); |
678 | ||
1da177e4 LT |
679 | /* |
680 | * PIIX4 Errata: We don't support throttling on the original PIIX4. | |
681 | * This shouldn't be an issue as few (if any) mobile systems ever | |
682 | * used this part. | |
683 | */ | |
684 | if (errata.piix4.throttle) { | |
685 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 686 | "Throttling not supported on PIIX4 A- or B-step\n")); |
d550d98d | 687 | return 0; |
1da177e4 LT |
688 | } |
689 | ||
1da177e4 | 690 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", |
4be44fcd | 691 | pr->throttling.state_count)); |
1da177e4 LT |
692 | |
693 | pr->flags.throttling = 1; | |
694 | ||
695 | /* | |
696 | * Disable throttling (if enabled). We'll let subsequent policy (e.g. | |
697 | * thermal) decide to lower performance if it so chooses, but for now | |
698 | * we'll crank up the speed. | |
699 | */ | |
700 | ||
701 | result = acpi_processor_get_throttling(pr); | |
702 | if (result) | |
703 | goto end; | |
704 | ||
705 | if (pr->throttling.state) { | |
4be44fcd LB |
706 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
707 | "Disabling throttling (was T%d)\n", | |
708 | pr->throttling.state)); | |
1da177e4 LT |
709 | result = acpi_processor_set_throttling(pr, 0); |
710 | if (result) | |
711 | goto end; | |
712 | } | |
713 | ||
4be44fcd | 714 | end: |
1da177e4 LT |
715 | if (result) |
716 | pr->flags.throttling = 0; | |
717 | ||
d550d98d | 718 | return result; |
1da177e4 LT |
719 | } |
720 | ||
1da177e4 LT |
721 | /* proc interface */ |
722 | ||
4be44fcd LB |
723 | static int acpi_processor_throttling_seq_show(struct seq_file *seq, |
724 | void *offset) | |
1da177e4 | 725 | { |
50dd0969 | 726 | struct acpi_processor *pr = seq->private; |
4be44fcd LB |
727 | int i = 0; |
728 | int result = 0; | |
1da177e4 | 729 | |
1da177e4 LT |
730 | if (!pr) |
731 | goto end; | |
732 | ||
733 | if (!(pr->throttling.state_count > 0)) { | |
734 | seq_puts(seq, "<not supported>\n"); | |
735 | goto end; | |
736 | } | |
737 | ||
738 | result = acpi_processor_get_throttling(pr); | |
739 | ||
740 | if (result) { | |
4be44fcd LB |
741 | seq_puts(seq, |
742 | "Could not determine current throttling state.\n"); | |
1da177e4 LT |
743 | goto end; |
744 | } | |
745 | ||
746 | seq_printf(seq, "state count: %d\n" | |
01854e69 | 747 | "active state: T%d\n" |
ff55a9ce | 748 | "state available: T%d to T%d\n", |
01854e69 | 749 | pr->throttling.state_count, pr->throttling.state, |
ff55a9ce LB |
750 | pr->throttling_platform_limit, |
751 | pr->throttling.state_count - 1); | |
1da177e4 LT |
752 | |
753 | seq_puts(seq, "states:\n"); | |
3cc2649b LY |
754 | if (pr->throttling.acpi_processor_get_throttling == |
755 | acpi_processor_get_throttling_fadt) { | |
01854e69 LY |
756 | for (i = 0; i < pr->throttling.state_count; i++) |
757 | seq_printf(seq, " %cT%d: %02d%%\n", | |
ff55a9ce LB |
758 | (i == pr->throttling.state ? '*' : ' '), i, |
759 | (pr->throttling.states[i].performance ? pr-> | |
760 | throttling.states[i].performance / 10 : 0)); | |
3cc2649b | 761 | } else { |
01854e69 LY |
762 | for (i = 0; i < pr->throttling.state_count; i++) |
763 | seq_printf(seq, " %cT%d: %02d%%\n", | |
ff55a9ce LB |
764 | (i == pr->throttling.state ? '*' : ' '), i, |
765 | (int)pr->throttling.states_tss[i]. | |
766 | freqpercentage); | |
3cc2649b | 767 | } |
1da177e4 | 768 | |
4be44fcd | 769 | end: |
d550d98d | 770 | return 0; |
1da177e4 LT |
771 | } |
772 | ||
4be44fcd LB |
773 | static int acpi_processor_throttling_open_fs(struct inode *inode, |
774 | struct file *file) | |
1da177e4 LT |
775 | { |
776 | return single_open(file, acpi_processor_throttling_seq_show, | |
4be44fcd | 777 | PDE(inode)->data); |
1da177e4 LT |
778 | } |
779 | ||
ff55a9ce | 780 | static ssize_t acpi_processor_write_throttling(struct file *file, |
757b1866 AB |
781 | const char __user * buffer, |
782 | size_t count, loff_t * data) | |
1da177e4 | 783 | { |
4be44fcd | 784 | int result = 0; |
50dd0969 JE |
785 | struct seq_file *m = file->private_data; |
786 | struct acpi_processor *pr = m->private; | |
4be44fcd | 787 | char state_string[12] = { '\0' }; |
1da177e4 | 788 | |
1da177e4 | 789 | if (!pr || (count > sizeof(state_string) - 1)) |
d550d98d | 790 | return -EINVAL; |
1da177e4 LT |
791 | |
792 | if (copy_from_user(state_string, buffer, count)) | |
d550d98d | 793 | return -EFAULT; |
1da177e4 LT |
794 | |
795 | state_string[count] = '\0'; | |
796 | ||
797 | result = acpi_processor_set_throttling(pr, | |
4be44fcd LB |
798 | simple_strtoul(state_string, |
799 | NULL, 0)); | |
1da177e4 | 800 | if (result) |
d550d98d | 801 | return result; |
1da177e4 | 802 | |
d550d98d | 803 | return count; |
1da177e4 LT |
804 | } |
805 | ||
806 | struct file_operations acpi_processor_throttling_fops = { | |
4be44fcd LB |
807 | .open = acpi_processor_throttling_open_fs, |
808 | .read = seq_read, | |
d479e908 | 809 | .write = acpi_processor_write_throttling, |
4be44fcd LB |
810 | .llseek = seq_lseek, |
811 | .release = single_release, | |
1da177e4 | 812 | }; |