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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 LY |
49 | |
50 | static int acpi_processor_get_platform_limit(struct acpi_processor *pr) | |
51 | { | |
52 | acpi_status status = 0; | |
53 | unsigned long tpc = 0; | |
54 | ||
ff55a9ce | 55 | if (!pr) |
01854e69 LY |
56 | return -EINVAL; |
57 | status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc); | |
ff55a9ce | 58 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
01854e69 LY |
59 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TPC")); |
60 | return -ENODEV; | |
61 | } | |
62 | pr->throttling_platform_limit = (int)tpc; | |
63 | return 0; | |
64 | } | |
65 | ||
66 | int acpi_processor_tstate_has_changed(struct acpi_processor *pr) | |
67 | { | |
68 | return acpi_processor_get_platform_limit(pr); | |
69 | } | |
70 | ||
71 | /* -------------------------------------------------------------------------- | |
72 | _PTC, _TSS, _TSD support | |
73 | -------------------------------------------------------------------------- */ | |
74 | static int acpi_processor_get_throttling_control(struct acpi_processor *pr) | |
75 | { | |
76 | int result = 0; | |
77 | acpi_status status = 0; | |
78 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
79 | union acpi_object *ptc = NULL; | |
80 | union acpi_object obj = { 0 }; | |
81 | ||
82 | status = acpi_evaluate_object(pr->handle, "_PTC", NULL, &buffer); | |
83 | if (ACPI_FAILURE(status)) { | |
84 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTC")); | |
85 | return -ENODEV; | |
86 | } | |
87 | ||
88 | ptc = (union acpi_object *)buffer.pointer; | |
89 | if (!ptc || (ptc->type != ACPI_TYPE_PACKAGE) | |
90 | || (ptc->package.count != 2)) { | |
91 | printk(KERN_ERR PREFIX "Invalid _PTC data\n"); | |
92 | result = -EFAULT; | |
93 | goto end; | |
94 | } | |
95 | ||
96 | /* | |
97 | * control_register | |
98 | */ | |
99 | ||
100 | obj = ptc->package.elements[0]; | |
101 | ||
102 | if ((obj.type != ACPI_TYPE_BUFFER) | |
103 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) | |
104 | || (obj.buffer.pointer == NULL)) { | |
ff55a9ce LB |
105 | printk(KERN_ERR PREFIX |
106 | "Invalid _PTC data (control_register)\n"); | |
01854e69 LY |
107 | result = -EFAULT; |
108 | goto end; | |
109 | } | |
110 | memcpy(&pr->throttling.control_register, obj.buffer.pointer, | |
111 | sizeof(struct acpi_ptc_register)); | |
112 | ||
113 | /* | |
114 | * status_register | |
115 | */ | |
116 | ||
117 | obj = ptc->package.elements[1]; | |
118 | ||
119 | if ((obj.type != ACPI_TYPE_BUFFER) | |
120 | || (obj.buffer.length < sizeof(struct acpi_ptc_register)) | |
121 | || (obj.buffer.pointer == NULL)) { | |
122 | printk(KERN_ERR PREFIX "Invalid _PTC data (status_register)\n"); | |
123 | result = -EFAULT; | |
124 | goto end; | |
125 | } | |
126 | ||
127 | memcpy(&pr->throttling.status_register, obj.buffer.pointer, | |
ff55a9ce | 128 | sizeof(struct acpi_ptc_register)); |
01854e69 | 129 | |
ff55a9ce | 130 | end: |
01854e69 LY |
131 | kfree(buffer.pointer); |
132 | ||
133 | return result; | |
134 | } | |
135 | static int acpi_processor_get_throttling_states(struct acpi_processor *pr) | |
136 | { | |
137 | int result = 0; | |
138 | acpi_status status = AE_OK; | |
139 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
140 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
141 | struct acpi_buffer state = { 0, NULL }; | |
142 | union acpi_object *tss = NULL; | |
143 | int i; | |
144 | ||
145 | status = acpi_evaluate_object(pr->handle, "_TSS", NULL, &buffer); | |
146 | if (ACPI_FAILURE(status)) { | |
147 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSS")); | |
148 | return -ENODEV; | |
149 | } | |
150 | ||
151 | tss = buffer.pointer; | |
152 | if (!tss || (tss->type != ACPI_TYPE_PACKAGE)) { | |
153 | printk(KERN_ERR PREFIX "Invalid _TSS data\n"); | |
154 | result = -EFAULT; | |
155 | goto end; | |
156 | } | |
157 | ||
158 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", | |
159 | tss->package.count)); | |
160 | ||
161 | pr->throttling.state_count = tss->package.count; | |
162 | pr->throttling.states_tss = | |
163 | kmalloc(sizeof(struct acpi_processor_tx_tss) * tss->package.count, | |
164 | GFP_KERNEL); | |
165 | if (!pr->throttling.states_tss) { | |
166 | result = -ENOMEM; | |
167 | goto end; | |
168 | } | |
169 | ||
170 | for (i = 0; i < pr->throttling.state_count; i++) { | |
171 | ||
ff55a9ce LB |
172 | struct acpi_processor_tx_tss *tx = |
173 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
174 | states_tss[i]); | |
01854e69 LY |
175 | |
176 | state.length = sizeof(struct acpi_processor_tx_tss); | |
177 | state.pointer = tx; | |
178 | ||
179 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i)); | |
180 | ||
181 | status = acpi_extract_package(&(tss->package.elements[i]), | |
182 | &format, &state); | |
183 | if (ACPI_FAILURE(status)) { | |
184 | ACPI_EXCEPTION((AE_INFO, status, "Invalid _TSS data")); | |
185 | result = -EFAULT; | |
186 | kfree(pr->throttling.states_tss); | |
187 | goto end; | |
188 | } | |
189 | ||
190 | if (!tx->freqpercentage) { | |
191 | printk(KERN_ERR PREFIX | |
ff55a9ce | 192 | "Invalid _TSS data: freq is zero\n"); |
01854e69 LY |
193 | result = -EFAULT; |
194 | kfree(pr->throttling.states_tss); | |
195 | goto end; | |
196 | } | |
197 | } | |
198 | ||
199 | end: | |
200 | kfree(buffer.pointer); | |
201 | ||
202 | return result; | |
203 | } | |
ff55a9ce | 204 | static int acpi_processor_get_tsd(struct acpi_processor *pr) |
01854e69 LY |
205 | { |
206 | int result = 0; | |
207 | acpi_status status = AE_OK; | |
ff55a9ce LB |
208 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
209 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
210 | struct acpi_buffer state = { 0, NULL }; | |
211 | union acpi_object *tsd = NULL; | |
01854e69 LY |
212 | struct acpi_tsd_package *pdomain; |
213 | ||
214 | status = acpi_evaluate_object(pr->handle, "_TSD", NULL, &buffer); | |
215 | if (ACPI_FAILURE(status)) { | |
216 | return -ENODEV; | |
217 | } | |
218 | ||
219 | tsd = buffer.pointer; | |
220 | if (!tsd || (tsd->type != ACPI_TYPE_PACKAGE)) { | |
221 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _TSD data\n")); | |
222 | result = -EFAULT; | |
223 | goto end; | |
224 | } | |
225 | ||
226 | if (tsd->package.count != 1) { | |
227 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _TSD data\n")); | |
228 | result = -EFAULT; | |
229 | goto end; | |
230 | } | |
231 | ||
232 | pdomain = &(pr->throttling.domain_info); | |
233 | ||
234 | state.length = sizeof(struct acpi_tsd_package); | |
235 | state.pointer = pdomain; | |
236 | ||
237 | status = acpi_extract_package(&(tsd->package.elements[0]), | |
ff55a9ce | 238 | &format, &state); |
01854e69 LY |
239 | if (ACPI_FAILURE(status)) { |
240 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _TSD data\n")); | |
241 | result = -EFAULT; | |
242 | goto end; | |
243 | } | |
244 | ||
245 | if (pdomain->num_entries != ACPI_TSD_REV0_ENTRIES) { | |
246 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _TSD:num_entries\n")); | |
247 | result = -EFAULT; | |
248 | goto end; | |
249 | } | |
250 | ||
251 | if (pdomain->revision != ACPI_TSD_REV0_REVISION) { | |
252 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _TSD:revision\n")); | |
253 | result = -EFAULT; | |
254 | goto end; | |
255 | } | |
256 | ||
ff55a9ce | 257 | end: |
01854e69 LY |
258 | kfree(buffer.pointer); |
259 | return result; | |
260 | } | |
261 | ||
1da177e4 LT |
262 | /* -------------------------------------------------------------------------- |
263 | Throttling Control | |
264 | -------------------------------------------------------------------------- */ | |
01854e69 | 265 | static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr) |
1da177e4 | 266 | { |
4be44fcd LB |
267 | int state = 0; |
268 | u32 value = 0; | |
269 | u32 duty_mask = 0; | |
270 | u32 duty_value = 0; | |
1da177e4 | 271 | |
1da177e4 | 272 | if (!pr) |
d550d98d | 273 | return -EINVAL; |
1da177e4 LT |
274 | |
275 | if (!pr->flags.throttling) | |
d550d98d | 276 | return -ENODEV; |
1da177e4 LT |
277 | |
278 | pr->throttling.state = 0; | |
279 | ||
280 | duty_mask = pr->throttling.state_count - 1; | |
281 | ||
282 | duty_mask <<= pr->throttling.duty_offset; | |
283 | ||
284 | local_irq_disable(); | |
285 | ||
286 | value = inl(pr->throttling.address); | |
287 | ||
288 | /* | |
289 | * Compute the current throttling state when throttling is enabled | |
290 | * (bit 4 is on). | |
291 | */ | |
292 | if (value & 0x10) { | |
293 | duty_value = value & duty_mask; | |
294 | duty_value >>= pr->throttling.duty_offset; | |
295 | ||
296 | if (duty_value) | |
4be44fcd | 297 | state = pr->throttling.state_count - duty_value; |
1da177e4 LT |
298 | } |
299 | ||
300 | pr->throttling.state = state; | |
301 | ||
302 | local_irq_enable(); | |
303 | ||
304 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
305 | "Throttling state is T%d (%d%% throttling applied)\n", |
306 | state, pr->throttling.states[state].performance)); | |
1da177e4 | 307 | |
d550d98d | 308 | return 0; |
1da177e4 LT |
309 | } |
310 | ||
ff55a9ce LB |
311 | static int acpi_read_throttling_status(struct acpi_processor_throttling |
312 | *throttling) | |
01854e69 LY |
313 | { |
314 | int value = -1; | |
315 | switch (throttling->status_register.space_id) { | |
316 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
ff55a9ce LB |
317 | acpi_os_read_port((acpi_io_address) throttling->status_register. |
318 | address, &value, | |
319 | (u32) throttling->status_register.bit_width * | |
320 | 8); | |
01854e69 LY |
321 | break; |
322 | case ACPI_ADR_SPACE_FIXED_HARDWARE: | |
ff55a9ce LB |
323 | printk(KERN_ERR PREFIX |
324 | "HARDWARE addr space,NOT supported yet\n"); | |
01854e69 LY |
325 | break; |
326 | default: | |
327 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", | |
ff55a9ce | 328 | (u32) (throttling->status_register.space_id)); |
01854e69 LY |
329 | } |
330 | return value; | |
331 | } | |
332 | ||
ff55a9ce LB |
333 | static int acpi_write_throttling_state(struct acpi_processor_throttling |
334 | *throttling, int value) | |
01854e69 LY |
335 | { |
336 | int ret = -1; | |
337 | ||
338 | switch (throttling->control_register.space_id) { | |
339 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
ff55a9ce LB |
340 | acpi_os_write_port((acpi_io_address) throttling-> |
341 | control_register.address, value, | |
342 | (u32) throttling->control_register. | |
343 | bit_width * 8); | |
01854e69 LY |
344 | ret = 0; |
345 | break; | |
346 | case ACPI_ADR_SPACE_FIXED_HARDWARE: | |
ff55a9ce LB |
347 | printk(KERN_ERR PREFIX |
348 | "HARDWARE addr space,NOT supported yet\n"); | |
01854e69 LY |
349 | break; |
350 | default: | |
351 | printk(KERN_ERR PREFIX "Unknown addr space %d\n", | |
ff55a9ce | 352 | (u32) (throttling->control_register.space_id)); |
01854e69 LY |
353 | } |
354 | return ret; | |
355 | } | |
356 | ||
ff55a9ce | 357 | static int acpi_get_throttling_state(struct acpi_processor *pr, int value) |
01854e69 LY |
358 | { |
359 | int i; | |
360 | ||
361 | for (i = 0; i < pr->throttling.state_count; i++) { | |
ff55a9ce LB |
362 | struct acpi_processor_tx_tss *tx = |
363 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
364 | states_tss[i]); | |
365 | if (tx->control == value) | |
01854e69 LY |
366 | break; |
367 | } | |
ff55a9ce LB |
368 | if (i > pr->throttling.state_count) |
369 | i = -1; | |
01854e69 LY |
370 | return i; |
371 | } | |
372 | ||
ff55a9ce | 373 | static int acpi_get_throttling_value(struct acpi_processor *pr, int state) |
01854e69 LY |
374 | { |
375 | int value = -1; | |
ff55a9ce LB |
376 | if (state >= 0 && state <= pr->throttling.state_count) { |
377 | struct acpi_processor_tx_tss *tx = | |
378 | (struct acpi_processor_tx_tss *)&(pr->throttling. | |
379 | states_tss[state]); | |
01854e69 LY |
380 | value = tx->control; |
381 | } | |
382 | return value; | |
383 | } | |
384 | ||
385 | static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr) | |
386 | { | |
387 | int state = 0; | |
388 | u32 value = 0; | |
389 | ||
01854e69 LY |
390 | if (!pr) |
391 | return -EINVAL; | |
392 | ||
393 | if (!pr->flags.throttling) | |
394 | return -ENODEV; | |
395 | ||
396 | pr->throttling.state = 0; | |
397 | local_irq_disable(); | |
398 | value = acpi_read_throttling_status(&pr->throttling); | |
ff55a9ce LB |
399 | if (value >= 0) { |
400 | state = acpi_get_throttling_state(pr, value); | |
01854e69 LY |
401 | pr->throttling.state = state; |
402 | } | |
403 | local_irq_enable(); | |
404 | ||
405 | return 0; | |
406 | } | |
407 | ||
01854e69 LY |
408 | static int acpi_processor_get_throttling(struct acpi_processor *pr) |
409 | { | |
410 | return pr->throttling.acpi_processor_get_throttling(pr); | |
411 | } | |
412 | ||
6c5cf8aa AB |
413 | static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr, |
414 | int state) | |
1da177e4 | 415 | { |
4be44fcd LB |
416 | u32 value = 0; |
417 | u32 duty_mask = 0; | |
418 | u32 duty_value = 0; | |
1da177e4 | 419 | |
1da177e4 | 420 | if (!pr) |
d550d98d | 421 | return -EINVAL; |
1da177e4 LT |
422 | |
423 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
d550d98d | 424 | return -EINVAL; |
1da177e4 LT |
425 | |
426 | if (!pr->flags.throttling) | |
d550d98d | 427 | return -ENODEV; |
1da177e4 LT |
428 | |
429 | if (state == pr->throttling.state) | |
d550d98d | 430 | return 0; |
1da177e4 | 431 | |
01854e69 LY |
432 | if (state < pr->throttling_platform_limit) |
433 | return -EPERM; | |
1da177e4 LT |
434 | /* |
435 | * Calculate the duty_value and duty_mask. | |
436 | */ | |
437 | if (state) { | |
438 | duty_value = pr->throttling.state_count - state; | |
439 | ||
440 | duty_value <<= pr->throttling.duty_offset; | |
441 | ||
442 | /* Used to clear all duty_value bits */ | |
443 | duty_mask = pr->throttling.state_count - 1; | |
444 | ||
cee324b1 | 445 | duty_mask <<= acpi_gbl_FADT.duty_offset; |
1da177e4 LT |
446 | duty_mask = ~duty_mask; |
447 | } | |
448 | ||
449 | local_irq_disable(); | |
450 | ||
451 | /* | |
452 | * Disable throttling by writing a 0 to bit 4. Note that we must | |
453 | * turn it off before you can change the duty_value. | |
454 | */ | |
455 | value = inl(pr->throttling.address); | |
456 | if (value & 0x10) { | |
457 | value &= 0xFFFFFFEF; | |
458 | outl(value, pr->throttling.address); | |
459 | } | |
460 | ||
461 | /* | |
462 | * Write the new duty_value and then enable throttling. Note | |
463 | * that a state value of 0 leaves throttling disabled. | |
464 | */ | |
465 | if (state) { | |
466 | value &= duty_mask; | |
467 | value |= duty_value; | |
468 | outl(value, pr->throttling.address); | |
469 | ||
470 | value |= 0x00000010; | |
471 | outl(value, pr->throttling.address); | |
472 | } | |
473 | ||
474 | pr->throttling.state = state; | |
475 | ||
476 | local_irq_enable(); | |
477 | ||
478 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd LB |
479 | "Throttling state set to T%d (%d%%)\n", state, |
480 | (pr->throttling.states[state].performance ? pr-> | |
481 | throttling.states[state].performance / 10 : 0))); | |
1da177e4 | 482 | |
d550d98d | 483 | return 0; |
1da177e4 LT |
484 | } |
485 | ||
6c5cf8aa AB |
486 | static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr, |
487 | int state) | |
01854e69 LY |
488 | { |
489 | u32 value = 0; | |
490 | ||
491 | if (!pr) | |
492 | return -EINVAL; | |
493 | ||
494 | if ((state < 0) || (state > (pr->throttling.state_count - 1))) | |
495 | return -EINVAL; | |
496 | ||
497 | if (!pr->flags.throttling) | |
498 | return -ENODEV; | |
499 | ||
500 | if (state == pr->throttling.state) | |
501 | return 0; | |
502 | ||
503 | if (state < pr->throttling_platform_limit) | |
504 | return -EPERM; | |
505 | ||
506 | local_irq_disable(); | |
507 | ||
ff55a9ce LB |
508 | value = acpi_get_throttling_value(pr, state); |
509 | if (value >= 0) { | |
510 | acpi_write_throttling_state(&pr->throttling, value); | |
01854e69 LY |
511 | pr->throttling.state = state; |
512 | } | |
513 | local_irq_enable(); | |
514 | ||
515 | return 0; | |
516 | } | |
517 | ||
518 | int acpi_processor_set_throttling(struct acpi_processor *pr, int state) | |
519 | { | |
ff55a9ce | 520 | return pr->throttling.acpi_processor_set_throttling(pr, state); |
01854e69 LY |
521 | } |
522 | ||
4be44fcd | 523 | int acpi_processor_get_throttling_info(struct acpi_processor *pr) |
1da177e4 | 524 | { |
4be44fcd LB |
525 | int result = 0; |
526 | int step = 0; | |
527 | int i = 0; | |
01854e69 LY |
528 | int no_ptc = 0; |
529 | int no_tss = 0; | |
530 | int no_tsd = 0; | |
1da177e4 | 531 | |
1da177e4 | 532 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
533 | "pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n", |
534 | pr->throttling.address, | |
535 | pr->throttling.duty_offset, | |
536 | pr->throttling.duty_width)); | |
1da177e4 LT |
537 | |
538 | if (!pr) | |
d550d98d | 539 | return -EINVAL; |
1da177e4 LT |
540 | |
541 | /* TBD: Support ACPI 2.0 objects */ | |
01854e69 LY |
542 | no_ptc = acpi_processor_get_throttling_control(pr); |
543 | no_tss = acpi_processor_get_throttling_states(pr); | |
544 | no_tsd = acpi_processor_get_tsd(pr); | |
545 | ||
ff55a9ce LB |
546 | if (no_ptc || no_tss) { |
547 | pr->throttling.acpi_processor_get_throttling = | |
548 | &acpi_processor_get_throttling_fadt; | |
549 | pr->throttling.acpi_processor_set_throttling = | |
550 | &acpi_processor_set_throttling_fadt; | |
01854e69 | 551 | } else { |
ff55a9ce LB |
552 | pr->throttling.acpi_processor_get_throttling = |
553 | &acpi_processor_get_throttling_ptc; | |
554 | pr->throttling.acpi_processor_set_throttling = | |
555 | &acpi_processor_set_throttling_ptc; | |
01854e69 | 556 | } |
1da177e4 LT |
557 | |
558 | if (!pr->throttling.address) { | |
559 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n")); | |
d550d98d | 560 | return 0; |
4be44fcd | 561 | } else if (!pr->throttling.duty_width) { |
1da177e4 | 562 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling states\n")); |
d550d98d | 563 | return 0; |
1da177e4 LT |
564 | } |
565 | /* TBD: Support duty_cycle values that span bit 4. */ | |
4be44fcd | 566 | else if ((pr->throttling.duty_offset + pr->throttling.duty_width) > 4) { |
cece9296 | 567 | printk(KERN_WARNING PREFIX "duty_cycle spans bit 4\n"); |
d550d98d | 568 | return 0; |
1da177e4 LT |
569 | } |
570 | ||
571 | /* | |
572 | * PIIX4 Errata: We don't support throttling on the original PIIX4. | |
573 | * This shouldn't be an issue as few (if any) mobile systems ever | |
574 | * used this part. | |
575 | */ | |
576 | if (errata.piix4.throttle) { | |
577 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 578 | "Throttling not supported on PIIX4 A- or B-step\n")); |
d550d98d | 579 | return 0; |
1da177e4 LT |
580 | } |
581 | ||
cee324b1 | 582 | pr->throttling.state_count = 1 << acpi_gbl_FADT.duty_width; |
1da177e4 LT |
583 | |
584 | /* | |
585 | * Compute state values. Note that throttling displays a linear power/ | |
586 | * performance relationship (at 50% performance the CPU will consume | |
587 | * 50% power). Values are in 1/10th of a percent to preserve accuracy. | |
588 | */ | |
589 | ||
590 | step = (1000 / pr->throttling.state_count); | |
591 | ||
4be44fcd | 592 | for (i = 0; i < pr->throttling.state_count; i++) { |
1da177e4 LT |
593 | pr->throttling.states[i].performance = step * i; |
594 | pr->throttling.states[i].power = step * i; | |
595 | } | |
596 | ||
597 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", | |
4be44fcd | 598 | pr->throttling.state_count)); |
1da177e4 LT |
599 | |
600 | pr->flags.throttling = 1; | |
601 | ||
602 | /* | |
603 | * Disable throttling (if enabled). We'll let subsequent policy (e.g. | |
604 | * thermal) decide to lower performance if it so chooses, but for now | |
605 | * we'll crank up the speed. | |
606 | */ | |
607 | ||
608 | result = acpi_processor_get_throttling(pr); | |
609 | if (result) | |
610 | goto end; | |
611 | ||
612 | if (pr->throttling.state) { | |
4be44fcd LB |
613 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
614 | "Disabling throttling (was T%d)\n", | |
615 | pr->throttling.state)); | |
1da177e4 LT |
616 | result = acpi_processor_set_throttling(pr, 0); |
617 | if (result) | |
618 | goto end; | |
619 | } | |
620 | ||
4be44fcd | 621 | end: |
1da177e4 LT |
622 | if (result) |
623 | pr->flags.throttling = 0; | |
624 | ||
d550d98d | 625 | return result; |
1da177e4 LT |
626 | } |
627 | ||
1da177e4 LT |
628 | /* proc interface */ |
629 | ||
4be44fcd LB |
630 | static int acpi_processor_throttling_seq_show(struct seq_file *seq, |
631 | void *offset) | |
1da177e4 | 632 | { |
50dd0969 | 633 | struct acpi_processor *pr = seq->private; |
4be44fcd LB |
634 | int i = 0; |
635 | int result = 0; | |
1da177e4 | 636 | |
1da177e4 LT |
637 | if (!pr) |
638 | goto end; | |
639 | ||
640 | if (!(pr->throttling.state_count > 0)) { | |
641 | seq_puts(seq, "<not supported>\n"); | |
642 | goto end; | |
643 | } | |
644 | ||
645 | result = acpi_processor_get_throttling(pr); | |
646 | ||
647 | if (result) { | |
4be44fcd LB |
648 | seq_puts(seq, |
649 | "Could not determine current throttling state.\n"); | |
1da177e4 LT |
650 | goto end; |
651 | } | |
652 | ||
653 | seq_printf(seq, "state count: %d\n" | |
01854e69 | 654 | "active state: T%d\n" |
ff55a9ce | 655 | "state available: T%d to T%d\n", |
01854e69 | 656 | pr->throttling.state_count, pr->throttling.state, |
ff55a9ce LB |
657 | pr->throttling_platform_limit, |
658 | pr->throttling.state_count - 1); | |
1da177e4 LT |
659 | |
660 | seq_puts(seq, "states:\n"); | |
ff55a9ce | 661 | if (acpi_processor_get_throttling == acpi_processor_get_throttling_fadt) |
01854e69 LY |
662 | for (i = 0; i < pr->throttling.state_count; i++) |
663 | seq_printf(seq, " %cT%d: %02d%%\n", | |
ff55a9ce LB |
664 | (i == pr->throttling.state ? '*' : ' '), i, |
665 | (pr->throttling.states[i].performance ? pr-> | |
666 | throttling.states[i].performance / 10 : 0)); | |
01854e69 LY |
667 | else |
668 | for (i = 0; i < pr->throttling.state_count; i++) | |
669 | seq_printf(seq, " %cT%d: %02d%%\n", | |
ff55a9ce LB |
670 | (i == pr->throttling.state ? '*' : ' '), i, |
671 | (int)pr->throttling.states_tss[i]. | |
672 | freqpercentage); | |
1da177e4 | 673 | |
4be44fcd | 674 | end: |
d550d98d | 675 | return 0; |
1da177e4 LT |
676 | } |
677 | ||
4be44fcd LB |
678 | static int acpi_processor_throttling_open_fs(struct inode *inode, |
679 | struct file *file) | |
1da177e4 LT |
680 | { |
681 | return single_open(file, acpi_processor_throttling_seq_show, | |
4be44fcd | 682 | PDE(inode)->data); |
1da177e4 LT |
683 | } |
684 | ||
ff55a9ce | 685 | static ssize_t acpi_processor_write_throttling(struct file *file, |
757b1866 AB |
686 | const char __user * buffer, |
687 | size_t count, loff_t * data) | |
1da177e4 | 688 | { |
4be44fcd | 689 | int result = 0; |
50dd0969 JE |
690 | struct seq_file *m = file->private_data; |
691 | struct acpi_processor *pr = m->private; | |
4be44fcd | 692 | char state_string[12] = { '\0' }; |
1da177e4 | 693 | |
1da177e4 | 694 | if (!pr || (count > sizeof(state_string) - 1)) |
d550d98d | 695 | return -EINVAL; |
1da177e4 LT |
696 | |
697 | if (copy_from_user(state_string, buffer, count)) | |
d550d98d | 698 | return -EFAULT; |
1da177e4 LT |
699 | |
700 | state_string[count] = '\0'; | |
701 | ||
702 | result = acpi_processor_set_throttling(pr, | |
4be44fcd LB |
703 | simple_strtoul(state_string, |
704 | NULL, 0)); | |
1da177e4 | 705 | if (result) |
d550d98d | 706 | return result; |
1da177e4 | 707 | |
d550d98d | 708 | return count; |
1da177e4 LT |
709 | } |
710 | ||
711 | struct file_operations acpi_processor_throttling_fops = { | |
4be44fcd LB |
712 | .open = acpi_processor_throttling_open_fs, |
713 | .read = seq_read, | |
d479e908 | 714 | .write = acpi_processor_write_throttling, |
4be44fcd LB |
715 | .llseek = seq_lseek, |
716 | .release = single_release, | |
1da177e4 | 717 | }; |