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1/******************************************************************************
2 *
3 * Copyright(c) 2007 - 2011 Intel Corporation. All rights reserved.
4 *
5 * Portions of this file are derived from the ipw3945 project, as well
6 * as portions of the ieee80211 subsystem header files.
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of version 2 of the GNU General Public License as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along with
18 * this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
20 *
21 * The full GNU General Public License is included in this distribution in the
22 * file called LICENSE.
23 *
24 * Contact Information:
25 * Intel Linux Wireless <ilw@linux.intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27 *****************************************************************************/
28
29
30#include <linux/kernel.h>
31#include <linux/module.h>
32#include <linux/slab.h>
33#include <linux/init.h>
34
35#include <net/mac80211.h>
36
37#include "iwl-eeprom.h"
38#include "iwl-dev.h"
39#include "iwl-core.h"
40#include "iwl-io.h"
41#include "iwl-commands.h"
42#include "iwl-debug.h"
43#include "iwl-agn-tt.h"
44
45/* default Thermal Throttling transaction table
46 * Current state | Throttling Down | Throttling Up
47 *=============================================================================
48 * Condition Nxt State Condition Nxt State Condition Nxt State
49 *-----------------------------------------------------------------------------
50 * IWL_TI_0 T >= 114 CT_KILL 114>T>=105 TI_1 N/A N/A
51 * IWL_TI_1 T >= 114 CT_KILL 114>T>=110 TI_2 T<=95 TI_0
52 * IWL_TI_2 T >= 114 CT_KILL T<=100 TI_1
53 * IWL_CT_KILL N/A N/A N/A N/A T<=95 TI_0
54 *=============================================================================
55 */
56static const struct iwl_tt_trans tt_range_0[IWL_TI_STATE_MAX - 1] = {
57 {IWL_TI_0, IWL_ABSOLUTE_ZERO, 104},
58 {IWL_TI_1, 105, CT_KILL_THRESHOLD - 1},
59 {IWL_TI_CT_KILL, CT_KILL_THRESHOLD, IWL_ABSOLUTE_MAX}
60};
61static const struct iwl_tt_trans tt_range_1[IWL_TI_STATE_MAX - 1] = {
62 {IWL_TI_0, IWL_ABSOLUTE_ZERO, 95},
63 {IWL_TI_2, 110, CT_KILL_THRESHOLD - 1},
64 {IWL_TI_CT_KILL, CT_KILL_THRESHOLD, IWL_ABSOLUTE_MAX}
65};
66static const struct iwl_tt_trans tt_range_2[IWL_TI_STATE_MAX - 1] = {
67 {IWL_TI_1, IWL_ABSOLUTE_ZERO, 100},
68 {IWL_TI_CT_KILL, CT_KILL_THRESHOLD, IWL_ABSOLUTE_MAX},
69 {IWL_TI_CT_KILL, CT_KILL_THRESHOLD, IWL_ABSOLUTE_MAX}
70};
71static const struct iwl_tt_trans tt_range_3[IWL_TI_STATE_MAX - 1] = {
72 {IWL_TI_0, IWL_ABSOLUTE_ZERO, CT_KILL_EXIT_THRESHOLD},
73 {IWL_TI_CT_KILL, CT_KILL_EXIT_THRESHOLD + 1, IWL_ABSOLUTE_MAX},
74 {IWL_TI_CT_KILL, CT_KILL_EXIT_THRESHOLD + 1, IWL_ABSOLUTE_MAX}
75};
76
77/* Advance Thermal Throttling default restriction table */
78static const struct iwl_tt_restriction restriction_range[IWL_TI_STATE_MAX] = {
79 {IWL_ANT_OK_MULTI, IWL_ANT_OK_MULTI, true },
80 {IWL_ANT_OK_SINGLE, IWL_ANT_OK_MULTI, true },
81 {IWL_ANT_OK_SINGLE, IWL_ANT_OK_SINGLE, false },
82 {IWL_ANT_OK_NONE, IWL_ANT_OK_NONE, false }
83};
84
85bool iwl_tt_is_low_power_state(struct iwl_priv *priv)
86{
87 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
88
89 if (tt->state >= IWL_TI_1)
90 return true;
91 return false;
92}
93
94u8 iwl_tt_current_power_mode(struct iwl_priv *priv)
95{
96 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
97
98 return tt->tt_power_mode;
99}
100
101bool iwl_ht_enabled(struct iwl_priv *priv)
102{
103 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
104 struct iwl_tt_restriction *restriction;
105
106 if (!priv->thermal_throttle.advanced_tt)
107 return true;
108 restriction = tt->restriction + tt->state;
109 return restriction->is_ht;
110}
111
112static bool iwl_within_ct_kill_margin(struct iwl_priv *priv)
113{
114 s32 temp = priv->temperature; /* degrees CELSIUS except specified */
115 bool within_margin = false;
116
117 if (priv->cfg->base_params->temperature_kelvin)
118 temp = KELVIN_TO_CELSIUS(priv->temperature);
119
120 if (!priv->thermal_throttle.advanced_tt)
121 within_margin = ((temp + IWL_TT_CT_KILL_MARGIN) >=
122 CT_KILL_THRESHOLD_LEGACY) ? true : false;
123 else
124 within_margin = ((temp + IWL_TT_CT_KILL_MARGIN) >=
125 CT_KILL_THRESHOLD) ? true : false;
126 return within_margin;
127}
128
129bool iwl_check_for_ct_kill(struct iwl_priv *priv)
130{
131 bool is_ct_kill = false;
132
133 if (iwl_within_ct_kill_margin(priv)) {
134 iwl_tt_enter_ct_kill(priv);
135 is_ct_kill = true;
136 }
137 return is_ct_kill;
138}
139
140enum iwl_antenna_ok iwl_tx_ant_restriction(struct iwl_priv *priv)
141{
142 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
143 struct iwl_tt_restriction *restriction;
144
145 if (!priv->thermal_throttle.advanced_tt)
146 return IWL_ANT_OK_MULTI;
147 restriction = tt->restriction + tt->state;
148 return restriction->tx_stream;
149}
150
151enum iwl_antenna_ok iwl_rx_ant_restriction(struct iwl_priv *priv)
152{
153 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
154 struct iwl_tt_restriction *restriction;
155
156 if (!priv->thermal_throttle.advanced_tt)
157 return IWL_ANT_OK_MULTI;
158 restriction = tt->restriction + tt->state;
159 return restriction->rx_stream;
160}
161
162#define CT_KILL_EXIT_DURATION (5) /* 5 seconds duration */
163#define CT_KILL_WAITING_DURATION (300) /* 300ms duration */
164
165/*
166 * toggle the bit to wake up uCode and check the temperature
167 * if the temperature is below CT, uCode will stay awake and send card
168 * state notification with CT_KILL bit clear to inform Thermal Throttling
169 * Management to change state. Otherwise, uCode will go back to sleep
170 * without doing anything, driver should continue the 5 seconds timer
171 * to wake up uCode for temperature check until temperature drop below CT
172 */
173static void iwl_tt_check_exit_ct_kill(unsigned long data)
174{
175 struct iwl_priv *priv = (struct iwl_priv *)data;
176 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
177 unsigned long flags;
178
179 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
180 return;
181
182 if (tt->state == IWL_TI_CT_KILL) {
183 if (priv->thermal_throttle.ct_kill_toggle) {
184 iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR,
185 CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
186 priv->thermal_throttle.ct_kill_toggle = false;
187 } else {
188 iwl_write32(priv, CSR_UCODE_DRV_GP1_SET,
189 CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
190 priv->thermal_throttle.ct_kill_toggle = true;
191 }
192 iwl_read32(priv, CSR_UCODE_DRV_GP1);
193 spin_lock_irqsave(&priv->reg_lock, flags);
194 if (!iwl_grab_nic_access(priv))
195 iwl_release_nic_access(priv);
196 spin_unlock_irqrestore(&priv->reg_lock, flags);
197
198 /* Reschedule the ct_kill timer to occur in
199 * CT_KILL_EXIT_DURATION seconds to ensure we get a
200 * thermal update */
201 IWL_DEBUG_TEMP(priv, "schedule ct_kill exit timer\n");
202 mod_timer(&priv->thermal_throttle.ct_kill_exit_tm,
203 jiffies + CT_KILL_EXIT_DURATION * HZ);
204 }
205}
206
207static void iwl_perform_ct_kill_task(struct iwl_priv *priv,
208 bool stop)
209{
210 if (stop) {
211 IWL_DEBUG_TEMP(priv, "Stop all queues\n");
212 if (priv->mac80211_registered)
213 ieee80211_stop_queues(priv->hw);
214 IWL_DEBUG_TEMP(priv,
215 "Schedule 5 seconds CT_KILL Timer\n");
216 mod_timer(&priv->thermal_throttle.ct_kill_exit_tm,
217 jiffies + CT_KILL_EXIT_DURATION * HZ);
218 } else {
219 IWL_DEBUG_TEMP(priv, "Wake all queues\n");
220 if (priv->mac80211_registered)
221 ieee80211_wake_queues(priv->hw);
222 }
223}
224
225static void iwl_tt_ready_for_ct_kill(unsigned long data)
226{
227 struct iwl_priv *priv = (struct iwl_priv *)data;
228 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
229
230 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
231 return;
232
233 /* temperature timer expired, ready to go into CT_KILL state */
234 if (tt->state != IWL_TI_CT_KILL) {
235 IWL_DEBUG_TEMP(priv, "entering CT_KILL state when "
236 "temperature timer expired\n");
237 tt->state = IWL_TI_CT_KILL;
238 set_bit(STATUS_CT_KILL, &priv->status);
239 iwl_perform_ct_kill_task(priv, true);
240 }
241}
242
243static void iwl_prepare_ct_kill_task(struct iwl_priv *priv)
244{
245 IWL_DEBUG_TEMP(priv, "Prepare to enter IWL_TI_CT_KILL\n");
246 /* make request to retrieve statistics information */
247 iwl_send_statistics_request(priv, CMD_SYNC, false);
248 /* Reschedule the ct_kill wait timer */
249 mod_timer(&priv->thermal_throttle.ct_kill_waiting_tm,
250 jiffies + msecs_to_jiffies(CT_KILL_WAITING_DURATION));
251}
252
253#define IWL_MINIMAL_POWER_THRESHOLD (CT_KILL_THRESHOLD_LEGACY)
254#define IWL_REDUCED_PERFORMANCE_THRESHOLD_2 (100)
255#define IWL_REDUCED_PERFORMANCE_THRESHOLD_1 (90)
256
257/*
258 * Legacy thermal throttling
259 * 1) Avoid NIC destruction due to high temperatures
260 * Chip will identify dangerously high temperatures that can
261 * harm the device and will power down
262 * 2) Avoid the NIC power down due to high temperature
263 * Throttle early enough to lower the power consumption before
264 * drastic steps are needed
265 */
266static void iwl_legacy_tt_handler(struct iwl_priv *priv, s32 temp, bool force)
267{
268 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
269 enum iwl_tt_state old_state;
270
271#ifdef CONFIG_IWLWIFI_DEBUG
272 if ((tt->tt_previous_temp) &&
273 (temp > tt->tt_previous_temp) &&
274 ((temp - tt->tt_previous_temp) >
275 IWL_TT_INCREASE_MARGIN)) {
276 IWL_DEBUG_TEMP(priv,
277 "Temperature increase %d degree Celsius\n",
278 (temp - tt->tt_previous_temp));
279 }
280#endif
281 old_state = tt->state;
282 /* in Celsius */
283 if (temp >= IWL_MINIMAL_POWER_THRESHOLD)
284 tt->state = IWL_TI_CT_KILL;
285 else if (temp >= IWL_REDUCED_PERFORMANCE_THRESHOLD_2)
286 tt->state = IWL_TI_2;
287 else if (temp >= IWL_REDUCED_PERFORMANCE_THRESHOLD_1)
288 tt->state = IWL_TI_1;
289 else
290 tt->state = IWL_TI_0;
291
292#ifdef CONFIG_IWLWIFI_DEBUG
293 tt->tt_previous_temp = temp;
294#endif
295 /* stop ct_kill_waiting_tm timer */
296 del_timer_sync(&priv->thermal_throttle.ct_kill_waiting_tm);
297 if (tt->state != old_state) {
298 switch (tt->state) {
299 case IWL_TI_0:
300 /*
301 * When the system is ready to go back to IWL_TI_0
302 * we only have to call iwl_power_update_mode() to
303 * do so.
304 */
305 break;
306 case IWL_TI_1:
307 tt->tt_power_mode = IWL_POWER_INDEX_3;
308 break;
309 case IWL_TI_2:
310 tt->tt_power_mode = IWL_POWER_INDEX_4;
311 break;
312 default:
313 tt->tt_power_mode = IWL_POWER_INDEX_5;
314 break;
315 }
316 mutex_lock(&priv->mutex);
317 if (old_state == IWL_TI_CT_KILL)
318 clear_bit(STATUS_CT_KILL, &priv->status);
319 if (tt->state != IWL_TI_CT_KILL &&
320 iwl_power_update_mode(priv, true)) {
321 /* TT state not updated
322 * try again during next temperature read
323 */
324 if (old_state == IWL_TI_CT_KILL)
325 set_bit(STATUS_CT_KILL, &priv->status);
326 tt->state = old_state;
327 IWL_ERR(priv, "Cannot update power mode, "
328 "TT state not updated\n");
329 } else {
330 if (tt->state == IWL_TI_CT_KILL) {
331 if (force) {
332 set_bit(STATUS_CT_KILL, &priv->status);
333 iwl_perform_ct_kill_task(priv, true);
334 } else {
335 iwl_prepare_ct_kill_task(priv);
336 tt->state = old_state;
337 }
338 } else if (old_state == IWL_TI_CT_KILL &&
339 tt->state != IWL_TI_CT_KILL)
340 iwl_perform_ct_kill_task(priv, false);
341 IWL_DEBUG_TEMP(priv, "Temperature state changed %u\n",
342 tt->state);
343 IWL_DEBUG_TEMP(priv, "Power Index change to %u\n",
344 tt->tt_power_mode);
345 }
346 mutex_unlock(&priv->mutex);
347 }
348}
349
350/*
351 * Advance thermal throttling
352 * 1) Avoid NIC destruction due to high temperatures
353 * Chip will identify dangerously high temperatures that can
354 * harm the device and will power down
355 * 2) Avoid the NIC power down due to high temperature
356 * Throttle early enough to lower the power consumption before
357 * drastic steps are needed
358 * Actions include relaxing the power down sleep thresholds and
359 * decreasing the number of TX streams
360 * 3) Avoid throughput performance impact as much as possible
361 *
362 *=============================================================================
363 * Condition Nxt State Condition Nxt State Condition Nxt State
364 *-----------------------------------------------------------------------------
365 * IWL_TI_0 T >= 114 CT_KILL 114>T>=105 TI_1 N/A N/A
366 * IWL_TI_1 T >= 114 CT_KILL 114>T>=110 TI_2 T<=95 TI_0
367 * IWL_TI_2 T >= 114 CT_KILL T<=100 TI_1
368 * IWL_CT_KILL N/A N/A N/A N/A T<=95 TI_0
369 *=============================================================================
370 */
371static void iwl_advance_tt_handler(struct iwl_priv *priv, s32 temp, bool force)
372{
373 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
374 int i;
375 bool changed = false;
376 enum iwl_tt_state old_state;
377 struct iwl_tt_trans *transaction;
378
379 old_state = tt->state;
380 for (i = 0; i < IWL_TI_STATE_MAX - 1; i++) {
381 /* based on the current TT state,
382 * find the curresponding transaction table
383 * each table has (IWL_TI_STATE_MAX - 1) entries
384 * tt->transaction + ((old_state * (IWL_TI_STATE_MAX - 1))
385 * will advance to the correct table.
386 * then based on the current temperature
387 * find the next state need to transaction to
388 * go through all the possible (IWL_TI_STATE_MAX - 1) entries
389 * in the current table to see if transaction is needed
390 */
391 transaction = tt->transaction +
392 ((old_state * (IWL_TI_STATE_MAX - 1)) + i);
393 if (temp >= transaction->tt_low &&
394 temp <= transaction->tt_high) {
395#ifdef CONFIG_IWLWIFI_DEBUG
396 if ((tt->tt_previous_temp) &&
397 (temp > tt->tt_previous_temp) &&
398 ((temp - tt->tt_previous_temp) >
399 IWL_TT_INCREASE_MARGIN)) {
400 IWL_DEBUG_TEMP(priv,
401 "Temperature increase %d "
402 "degree Celsius\n",
403 (temp - tt->tt_previous_temp));
404 }
405 tt->tt_previous_temp = temp;
406#endif
407 if (old_state !=
408 transaction->next_state) {
409 changed = true;
410 tt->state =
411 transaction->next_state;
412 }
413 break;
414 }
415 }
416 /* stop ct_kill_waiting_tm timer */
417 del_timer_sync(&priv->thermal_throttle.ct_kill_waiting_tm);
418 if (changed) {
419 if (tt->state >= IWL_TI_1) {
420 /* force PI = IWL_POWER_INDEX_5 in the case of TI > 0 */
421 tt->tt_power_mode = IWL_POWER_INDEX_5;
422
423 if (!iwl_ht_enabled(priv)) {
424 struct iwl_rxon_context *ctx;
425
426 for_each_context(priv, ctx) {
427 struct iwl_rxon_cmd *rxon;
428
429 rxon = &ctx->staging;
430
431 /* disable HT */
432 rxon->flags &= ~(
433 RXON_FLG_CHANNEL_MODE_MSK |
434 RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK |
435 RXON_FLG_HT40_PROT_MSK |
436 RXON_FLG_HT_PROT_MSK);
437 }
438 } else {
439 /* check HT capability and set
440 * according to the system HT capability
441 * in case get disabled before */
442 iwl_set_rxon_ht(priv, &priv->current_ht_config);
443 }
444
445 } else {
446 /*
447 * restore system power setting -- it will be
448 * recalculated automatically.
449 */
450
451 /* check HT capability and set
452 * according to the system HT capability
453 * in case get disabled before */
454 iwl_set_rxon_ht(priv, &priv->current_ht_config);
455 }
456 mutex_lock(&priv->mutex);
457 if (old_state == IWL_TI_CT_KILL)
458 clear_bit(STATUS_CT_KILL, &priv->status);
459 if (tt->state != IWL_TI_CT_KILL &&
460 iwl_power_update_mode(priv, true)) {
461 /* TT state not updated
462 * try again during next temperature read
463 */
464 IWL_ERR(priv, "Cannot update power mode, "
465 "TT state not updated\n");
466 if (old_state == IWL_TI_CT_KILL)
467 set_bit(STATUS_CT_KILL, &priv->status);
468 tt->state = old_state;
469 } else {
470 IWL_DEBUG_TEMP(priv,
471 "Thermal Throttling to new state: %u\n",
472 tt->state);
473 if (old_state != IWL_TI_CT_KILL &&
474 tt->state == IWL_TI_CT_KILL) {
475 if (force) {
476 IWL_DEBUG_TEMP(priv,
477 "Enter IWL_TI_CT_KILL\n");
478 set_bit(STATUS_CT_KILL, &priv->status);
479 iwl_perform_ct_kill_task(priv, true);
480 } else {
481 iwl_prepare_ct_kill_task(priv);
482 tt->state = old_state;
483 }
484 } else if (old_state == IWL_TI_CT_KILL &&
485 tt->state != IWL_TI_CT_KILL) {
486 IWL_DEBUG_TEMP(priv, "Exit IWL_TI_CT_KILL\n");
487 iwl_perform_ct_kill_task(priv, false);
488 }
489 }
490 mutex_unlock(&priv->mutex);
491 }
492}
493
494/* Card State Notification indicated reach critical temperature
495 * if PSP not enable, no Thermal Throttling function will be performed
496 * just set the GP1 bit to acknowledge the event
497 * otherwise, go into IWL_TI_CT_KILL state
498 * since Card State Notification will not provide any temperature reading
499 * for Legacy mode
500 * so just pass the CT_KILL temperature to iwl_legacy_tt_handler()
501 * for advance mode
502 * pass CT_KILL_THRESHOLD+1 to make sure move into IWL_TI_CT_KILL state
503 */
504static void iwl_bg_ct_enter(struct work_struct *work)
505{
506 struct iwl_priv *priv = container_of(work, struct iwl_priv, ct_enter);
507 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
508
509 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
510 return;
511
512 if (!iwl_is_ready(priv))
513 return;
514
515 if (tt->state != IWL_TI_CT_KILL) {
516 IWL_ERR(priv, "Device reached critical temperature "
517 "- ucode going to sleep!\n");
518 if (!priv->thermal_throttle.advanced_tt)
519 iwl_legacy_tt_handler(priv,
520 IWL_MINIMAL_POWER_THRESHOLD,
521 true);
522 else
523 iwl_advance_tt_handler(priv,
524 CT_KILL_THRESHOLD + 1, true);
525 }
526}
527
528/* Card State Notification indicated out of critical temperature
529 * since Card State Notification will not provide any temperature reading
530 * so pass the IWL_REDUCED_PERFORMANCE_THRESHOLD_2 temperature
531 * to iwl_legacy_tt_handler() to get out of IWL_CT_KILL state
532 */
533static void iwl_bg_ct_exit(struct work_struct *work)
534{
535 struct iwl_priv *priv = container_of(work, struct iwl_priv, ct_exit);
536 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
537
538 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
539 return;
540
541 if (!iwl_is_ready(priv))
542 return;
543
544 /* stop ct_kill_exit_tm timer */
545 del_timer_sync(&priv->thermal_throttle.ct_kill_exit_tm);
546
547 if (tt->state == IWL_TI_CT_KILL) {
548 IWL_ERR(priv,
549 "Device temperature below critical"
550 "- ucode awake!\n");
551 /*
552 * exit from CT_KILL state
553 * reset the current temperature reading
554 */
555 priv->temperature = 0;
556 if (!priv->thermal_throttle.advanced_tt)
557 iwl_legacy_tt_handler(priv,
558 IWL_REDUCED_PERFORMANCE_THRESHOLD_2,
559 true);
560 else
561 iwl_advance_tt_handler(priv, CT_KILL_EXIT_THRESHOLD,
562 true);
563 }
564}
565
566void iwl_tt_enter_ct_kill(struct iwl_priv *priv)
567{
568 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
569 return;
570
571 IWL_DEBUG_TEMP(priv, "Queueing critical temperature enter.\n");
572 queue_work(priv->workqueue, &priv->ct_enter);
573}
574
575void iwl_tt_exit_ct_kill(struct iwl_priv *priv)
576{
577 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
578 return;
579
580 IWL_DEBUG_TEMP(priv, "Queueing critical temperature exit.\n");
581 queue_work(priv->workqueue, &priv->ct_exit);
582}
583
584static void iwl_bg_tt_work(struct work_struct *work)
585{
586 struct iwl_priv *priv = container_of(work, struct iwl_priv, tt_work);
587 s32 temp = priv->temperature; /* degrees CELSIUS except specified */
588
589 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
590 return;
591
592 if (priv->cfg->base_params->temperature_kelvin)
593 temp = KELVIN_TO_CELSIUS(priv->temperature);
594
595 if (!priv->thermal_throttle.advanced_tt)
596 iwl_legacy_tt_handler(priv, temp, false);
597 else
598 iwl_advance_tt_handler(priv, temp, false);
599}
600
601void iwl_tt_handler(struct iwl_priv *priv)
602{
603 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
604 return;
605
606 IWL_DEBUG_TEMP(priv, "Queueing thermal throttling work.\n");
607 queue_work(priv->workqueue, &priv->tt_work);
608}
609
610/* Thermal throttling initialization
611 * For advance thermal throttling:
612 * Initialize Thermal Index and temperature threshold table
613 * Initialize thermal throttling restriction table
614 */
615void iwl_tt_initialize(struct iwl_priv *priv)
616{
617 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
618 int size = sizeof(struct iwl_tt_trans) * (IWL_TI_STATE_MAX - 1);
619 struct iwl_tt_trans *transaction;
620
621 IWL_DEBUG_TEMP(priv, "Initialize Thermal Throttling\n");
622
623 memset(tt, 0, sizeof(struct iwl_tt_mgmt));
624
625 tt->state = IWL_TI_0;
626 init_timer(&priv->thermal_throttle.ct_kill_exit_tm);
627 priv->thermal_throttle.ct_kill_exit_tm.data = (unsigned long)priv;
628 priv->thermal_throttle.ct_kill_exit_tm.function =
629 iwl_tt_check_exit_ct_kill;
630 init_timer(&priv->thermal_throttle.ct_kill_waiting_tm);
631 priv->thermal_throttle.ct_kill_waiting_tm.data =
632 (unsigned long)priv;
633 priv->thermal_throttle.ct_kill_waiting_tm.function =
634 iwl_tt_ready_for_ct_kill;
635 /* setup deferred ct kill work */
636 INIT_WORK(&priv->tt_work, iwl_bg_tt_work);
637 INIT_WORK(&priv->ct_enter, iwl_bg_ct_enter);
638 INIT_WORK(&priv->ct_exit, iwl_bg_ct_exit);
639
640 if (priv->cfg->base_params->adv_thermal_throttle) {
641 IWL_DEBUG_TEMP(priv, "Advanced Thermal Throttling\n");
642 tt->restriction = kzalloc(sizeof(struct iwl_tt_restriction) *
643 IWL_TI_STATE_MAX, GFP_KERNEL);
644 tt->transaction = kzalloc(sizeof(struct iwl_tt_trans) *
645 IWL_TI_STATE_MAX * (IWL_TI_STATE_MAX - 1),
646 GFP_KERNEL);
647 if (!tt->restriction || !tt->transaction) {
648 IWL_ERR(priv, "Fallback to Legacy Throttling\n");
649 priv->thermal_throttle.advanced_tt = false;
650 kfree(tt->restriction);
651 tt->restriction = NULL;
652 kfree(tt->transaction);
653 tt->transaction = NULL;
654 } else {
655 transaction = tt->transaction +
656 (IWL_TI_0 * (IWL_TI_STATE_MAX - 1));
657 memcpy(transaction, &tt_range_0[0], size);
658 transaction = tt->transaction +
659 (IWL_TI_1 * (IWL_TI_STATE_MAX - 1));
660 memcpy(transaction, &tt_range_1[0], size);
661 transaction = tt->transaction +
662 (IWL_TI_2 * (IWL_TI_STATE_MAX - 1));
663 memcpy(transaction, &tt_range_2[0], size);
664 transaction = tt->transaction +
665 (IWL_TI_CT_KILL * (IWL_TI_STATE_MAX - 1));
666 memcpy(transaction, &tt_range_3[0], size);
667 size = sizeof(struct iwl_tt_restriction) *
668 IWL_TI_STATE_MAX;
669 memcpy(tt->restriction,
670 &restriction_range[0], size);
671 priv->thermal_throttle.advanced_tt = true;
672 }
673 } else {
674 IWL_DEBUG_TEMP(priv, "Legacy Thermal Throttling\n");
675 priv->thermal_throttle.advanced_tt = false;
676 }
677}
678
679/* cleanup thermal throttling management related memory and timer */
680void iwl_tt_exit(struct iwl_priv *priv)
681{
682 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
683
684 /* stop ct_kill_exit_tm timer if activated */
685 del_timer_sync(&priv->thermal_throttle.ct_kill_exit_tm);
686 /* stop ct_kill_waiting_tm timer if activated */
687 del_timer_sync(&priv->thermal_throttle.ct_kill_waiting_tm);
688 cancel_work_sync(&priv->tt_work);
689 cancel_work_sync(&priv->ct_enter);
690 cancel_work_sync(&priv->ct_exit);
691
692 if (priv->thermal_throttle.advanced_tt) {
693 /* free advance thermal throttling memory */
694 kfree(tt->restriction);
695 tt->restriction = NULL;
696 kfree(tt->transaction);
697 tt->transaction = NULL;
698 }
699}