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1// SPDX-License-Identifier: GPL-2.0-only
2/******************************************************************************
3 *
4 * Copyright(c) 2007 - 2014 Intel Corporation. All rights reserved.
5 * Copyright (C) 2018, 2020 Intel Corporation
6 *
7 * Portions of this file are derived from the ipw3945 project, as well
8 * as portions of the ieee80211 subsystem header files.
9 *****************************************************************************/
10
11
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/slab.h>
15#include <net/mac80211.h>
16#include "iwl-io.h"
17#include "iwl-modparams.h"
18#include "iwl-debug.h"
19#include "agn.h"
20#include "dev.h"
21#include "commands.h"
22#include "tt.h"
23
24/* default Thermal Throttling transaction table
25 * Current state | Throttling Down | Throttling Up
26 *=============================================================================
27 * Condition Nxt State Condition Nxt State Condition Nxt State
28 *-----------------------------------------------------------------------------
29 * IWL_TI_0 T >= 114 CT_KILL 114>T>=105 TI_1 N/A N/A
30 * IWL_TI_1 T >= 114 CT_KILL 114>T>=110 TI_2 T<=95 TI_0
31 * IWL_TI_2 T >= 114 CT_KILL T<=100 TI_1
32 * IWL_CT_KILL N/A N/A N/A N/A T<=95 TI_0
33 *=============================================================================
34 */
35static const struct iwl_tt_trans tt_range_0[IWL_TI_STATE_MAX - 1] = {
36 {IWL_TI_0, IWL_ABSOLUTE_ZERO, 104},
37 {IWL_TI_1, 105, CT_KILL_THRESHOLD - 1},
38 {IWL_TI_CT_KILL, CT_KILL_THRESHOLD, IWL_ABSOLUTE_MAX}
39};
40static const struct iwl_tt_trans tt_range_1[IWL_TI_STATE_MAX - 1] = {
41 {IWL_TI_0, IWL_ABSOLUTE_ZERO, 95},
42 {IWL_TI_2, 110, CT_KILL_THRESHOLD - 1},
43 {IWL_TI_CT_KILL, CT_KILL_THRESHOLD, IWL_ABSOLUTE_MAX}
44};
45static const struct iwl_tt_trans tt_range_2[IWL_TI_STATE_MAX - 1] = {
46 {IWL_TI_1, IWL_ABSOLUTE_ZERO, 100},
47 {IWL_TI_CT_KILL, CT_KILL_THRESHOLD, IWL_ABSOLUTE_MAX},
48 {IWL_TI_CT_KILL, CT_KILL_THRESHOLD, IWL_ABSOLUTE_MAX}
49};
50static const struct iwl_tt_trans tt_range_3[IWL_TI_STATE_MAX - 1] = {
51 {IWL_TI_0, IWL_ABSOLUTE_ZERO, CT_KILL_EXIT_THRESHOLD},
52 {IWL_TI_CT_KILL, CT_KILL_EXIT_THRESHOLD + 1, IWL_ABSOLUTE_MAX},
53 {IWL_TI_CT_KILL, CT_KILL_EXIT_THRESHOLD + 1, IWL_ABSOLUTE_MAX}
54};
55
56/* Advance Thermal Throttling default restriction table */
57static const struct iwl_tt_restriction restriction_range[IWL_TI_STATE_MAX] = {
58 {IWL_ANT_OK_MULTI, IWL_ANT_OK_MULTI, true },
59 {IWL_ANT_OK_SINGLE, IWL_ANT_OK_MULTI, true },
60 {IWL_ANT_OK_SINGLE, IWL_ANT_OK_SINGLE, false },
61 {IWL_ANT_OK_NONE, IWL_ANT_OK_NONE, false }
62};
63
64bool iwl_tt_is_low_power_state(struct iwl_priv *priv)
65{
66 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
67
68 if (tt->state >= IWL_TI_1)
69 return true;
70 return false;
71}
72
73u8 iwl_tt_current_power_mode(struct iwl_priv *priv)
74{
75 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
76
77 return tt->tt_power_mode;
78}
79
80bool iwl_ht_enabled(struct iwl_priv *priv)
81{
82 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
83 struct iwl_tt_restriction *restriction;
84
85 if (!priv->thermal_throttle.advanced_tt)
86 return true;
87 restriction = tt->restriction + tt->state;
88 return restriction->is_ht;
89}
90
91static bool iwl_within_ct_kill_margin(struct iwl_priv *priv)
92{
93 s32 temp = priv->temperature; /* degrees CELSIUS except specified */
94 bool within_margin = false;
95
96 if (!priv->thermal_throttle.advanced_tt)
97 within_margin = ((temp + IWL_TT_CT_KILL_MARGIN) >=
98 CT_KILL_THRESHOLD_LEGACY) ? true : false;
99 else
100 within_margin = ((temp + IWL_TT_CT_KILL_MARGIN) >=
101 CT_KILL_THRESHOLD) ? true : false;
102 return within_margin;
103}
104
105bool iwl_check_for_ct_kill(struct iwl_priv *priv)
106{
107 bool is_ct_kill = false;
108
109 if (iwl_within_ct_kill_margin(priv)) {
110 iwl_tt_enter_ct_kill(priv);
111 is_ct_kill = true;
112 }
113 return is_ct_kill;
114}
115
116enum iwl_antenna_ok iwl_tx_ant_restriction(struct iwl_priv *priv)
117{
118 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
119 struct iwl_tt_restriction *restriction;
120
121 if (!priv->thermal_throttle.advanced_tt)
122 return IWL_ANT_OK_MULTI;
123 restriction = tt->restriction + tt->state;
124 return restriction->tx_stream;
125}
126
127enum iwl_antenna_ok iwl_rx_ant_restriction(struct iwl_priv *priv)
128{
129 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
130 struct iwl_tt_restriction *restriction;
131
132 if (!priv->thermal_throttle.advanced_tt)
133 return IWL_ANT_OK_MULTI;
134 restriction = tt->restriction + tt->state;
135 return restriction->rx_stream;
136}
137
138#define CT_KILL_EXIT_DURATION (5) /* 5 seconds duration */
139#define CT_KILL_WAITING_DURATION (300) /* 300ms duration */
140
141/*
142 * toggle the bit to wake up uCode and check the temperature
143 * if the temperature is below CT, uCode will stay awake and send card
144 * state notification with CT_KILL bit clear to inform Thermal Throttling
145 * Management to change state. Otherwise, uCode will go back to sleep
146 * without doing anything, driver should continue the 5 seconds timer
147 * to wake up uCode for temperature check until temperature drop below CT
148 */
149static void iwl_tt_check_exit_ct_kill(struct timer_list *t)
150{
151 struct iwl_priv *priv = from_timer(priv, t,
152 thermal_throttle.ct_kill_exit_tm);
153 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
154
155 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
156 return;
157
158 if (tt->state == IWL_TI_CT_KILL) {
159 if (priv->thermal_throttle.ct_kill_toggle) {
160 iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_CLR,
161 CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
162 priv->thermal_throttle.ct_kill_toggle = false;
163 } else {
164 iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_SET,
165 CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
166 priv->thermal_throttle.ct_kill_toggle = true;
167 }
168 iwl_read32(priv->trans, CSR_UCODE_DRV_GP1);
169 if (iwl_trans_grab_nic_access(priv->trans))
170 iwl_trans_release_nic_access(priv->trans);
171
172 /* Reschedule the ct_kill timer to occur in
173 * CT_KILL_EXIT_DURATION seconds to ensure we get a
174 * thermal update */
175 IWL_DEBUG_TEMP(priv, "schedule ct_kill exit timer\n");
176 mod_timer(&priv->thermal_throttle.ct_kill_exit_tm,
177 jiffies + CT_KILL_EXIT_DURATION * HZ);
178 }
179}
180
181static void iwl_perform_ct_kill_task(struct iwl_priv *priv,
182 bool stop)
183{
184 if (stop) {
185 IWL_DEBUG_TEMP(priv, "Stop all queues\n");
186 if (priv->mac80211_registered)
187 ieee80211_stop_queues(priv->hw);
188 IWL_DEBUG_TEMP(priv,
189 "Schedule 5 seconds CT_KILL Timer\n");
190 mod_timer(&priv->thermal_throttle.ct_kill_exit_tm,
191 jiffies + CT_KILL_EXIT_DURATION * HZ);
192 } else {
193 IWL_DEBUG_TEMP(priv, "Wake all queues\n");
194 if (priv->mac80211_registered)
195 ieee80211_wake_queues(priv->hw);
196 }
197}
198
199static void iwl_tt_ready_for_ct_kill(struct timer_list *t)
200{
201 struct iwl_priv *priv = from_timer(priv, t,
202 thermal_throttle.ct_kill_waiting_tm);
203 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
204
205 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
206 return;
207
208 /* temperature timer expired, ready to go into CT_KILL state */
209 if (tt->state != IWL_TI_CT_KILL) {
210 IWL_DEBUG_TEMP(priv, "entering CT_KILL state when "
211 "temperature timer expired\n");
212 tt->state = IWL_TI_CT_KILL;
213 set_bit(STATUS_CT_KILL, &priv->status);
214 iwl_perform_ct_kill_task(priv, true);
215 }
216}
217
218static void iwl_prepare_ct_kill_task(struct iwl_priv *priv)
219{
220 IWL_DEBUG_TEMP(priv, "Prepare to enter IWL_TI_CT_KILL\n");
221 /* make request to retrieve statistics information */
222 iwl_send_statistics_request(priv, 0, false);
223 /* Reschedule the ct_kill wait timer */
224 mod_timer(&priv->thermal_throttle.ct_kill_waiting_tm,
225 jiffies + msecs_to_jiffies(CT_KILL_WAITING_DURATION));
226}
227
228#define IWL_MINIMAL_POWER_THRESHOLD (CT_KILL_THRESHOLD_LEGACY)
229#define IWL_REDUCED_PERFORMANCE_THRESHOLD_2 (100)
230#define IWL_REDUCED_PERFORMANCE_THRESHOLD_1 (90)
231
232/*
233 * Legacy thermal throttling
234 * 1) Avoid NIC destruction due to high temperatures
235 * Chip will identify dangerously high temperatures that can
236 * harm the device and will power down
237 * 2) Avoid the NIC power down due to high temperature
238 * Throttle early enough to lower the power consumption before
239 * drastic steps are needed
240 */
241static void iwl_legacy_tt_handler(struct iwl_priv *priv, s32 temp, bool force)
242{
243 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
244 enum iwl_tt_state old_state;
245
246#ifdef CONFIG_IWLWIFI_DEBUG
247 if ((tt->tt_previous_temp) &&
248 (temp > tt->tt_previous_temp) &&
249 ((temp - tt->tt_previous_temp) >
250 IWL_TT_INCREASE_MARGIN)) {
251 IWL_DEBUG_TEMP(priv,
252 "Temperature increase %d degree Celsius\n",
253 (temp - tt->tt_previous_temp));
254 }
255#endif
256 old_state = tt->state;
257 /* in Celsius */
258 if (temp >= IWL_MINIMAL_POWER_THRESHOLD)
259 tt->state = IWL_TI_CT_KILL;
260 else if (temp >= IWL_REDUCED_PERFORMANCE_THRESHOLD_2)
261 tt->state = IWL_TI_2;
262 else if (temp >= IWL_REDUCED_PERFORMANCE_THRESHOLD_1)
263 tt->state = IWL_TI_1;
264 else
265 tt->state = IWL_TI_0;
266
267#ifdef CONFIG_IWLWIFI_DEBUG
268 tt->tt_previous_temp = temp;
269#endif
270 /* stop ct_kill_waiting_tm timer */
271 del_timer_sync(&priv->thermal_throttle.ct_kill_waiting_tm);
272 if (tt->state != old_state) {
273 switch (tt->state) {
274 case IWL_TI_0:
275 /*
276 * When the system is ready to go back to IWL_TI_0
277 * we only have to call iwl_power_update_mode() to
278 * do so.
279 */
280 break;
281 case IWL_TI_1:
282 tt->tt_power_mode = IWL_POWER_INDEX_3;
283 break;
284 case IWL_TI_2:
285 tt->tt_power_mode = IWL_POWER_INDEX_4;
286 break;
287 default:
288 tt->tt_power_mode = IWL_POWER_INDEX_5;
289 break;
290 }
291 mutex_lock(&priv->mutex);
292 if (old_state == IWL_TI_CT_KILL)
293 clear_bit(STATUS_CT_KILL, &priv->status);
294 if (tt->state != IWL_TI_CT_KILL &&
295 iwl_power_update_mode(priv, true)) {
296 /* TT state not updated
297 * try again during next temperature read
298 */
299 if (old_state == IWL_TI_CT_KILL)
300 set_bit(STATUS_CT_KILL, &priv->status);
301 tt->state = old_state;
302 IWL_ERR(priv, "Cannot update power mode, "
303 "TT state not updated\n");
304 } else {
305 if (tt->state == IWL_TI_CT_KILL) {
306 if (force) {
307 set_bit(STATUS_CT_KILL, &priv->status);
308 iwl_perform_ct_kill_task(priv, true);
309 } else {
310 iwl_prepare_ct_kill_task(priv);
311 tt->state = old_state;
312 }
313 } else if (old_state == IWL_TI_CT_KILL) {
314 iwl_perform_ct_kill_task(priv, false);
315 }
316 IWL_DEBUG_TEMP(priv, "Temperature state changed %u\n",
317 tt->state);
318 IWL_DEBUG_TEMP(priv, "Power Index change to %u\n",
319 tt->tt_power_mode);
320 }
321 mutex_unlock(&priv->mutex);
322 }
323}
324
325/*
326 * Advance thermal throttling
327 * 1) Avoid NIC destruction due to high temperatures
328 * Chip will identify dangerously high temperatures that can
329 * harm the device and will power down
330 * 2) Avoid the NIC power down due to high temperature
331 * Throttle early enough to lower the power consumption before
332 * drastic steps are needed
333 * Actions include relaxing the power down sleep thresholds and
334 * decreasing the number of TX streams
335 * 3) Avoid throughput performance impact as much as possible
336 *
337 *=============================================================================
338 * Condition Nxt State Condition Nxt State Condition Nxt State
339 *-----------------------------------------------------------------------------
340 * IWL_TI_0 T >= 114 CT_KILL 114>T>=105 TI_1 N/A N/A
341 * IWL_TI_1 T >= 114 CT_KILL 114>T>=110 TI_2 T<=95 TI_0
342 * IWL_TI_2 T >= 114 CT_KILL T<=100 TI_1
343 * IWL_CT_KILL N/A N/A N/A N/A T<=95 TI_0
344 *=============================================================================
345 */
346static void iwl_advance_tt_handler(struct iwl_priv *priv, s32 temp, bool force)
347{
348 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
349 int i;
350 bool changed = false;
351 enum iwl_tt_state old_state;
352 struct iwl_tt_trans *transaction;
353
354 old_state = tt->state;
355 for (i = 0; i < IWL_TI_STATE_MAX - 1; i++) {
356 /* based on the current TT state,
357 * find the curresponding transaction table
358 * each table has (IWL_TI_STATE_MAX - 1) entries
359 * tt->transaction + ((old_state * (IWL_TI_STATE_MAX - 1))
360 * will advance to the correct table.
361 * then based on the current temperature
362 * find the next state need to transaction to
363 * go through all the possible (IWL_TI_STATE_MAX - 1) entries
364 * in the current table to see if transaction is needed
365 */
366 transaction = tt->transaction +
367 ((old_state * (IWL_TI_STATE_MAX - 1)) + i);
368 if (temp >= transaction->tt_low &&
369 temp <= transaction->tt_high) {
370#ifdef CONFIG_IWLWIFI_DEBUG
371 if ((tt->tt_previous_temp) &&
372 (temp > tt->tt_previous_temp) &&
373 ((temp - tt->tt_previous_temp) >
374 IWL_TT_INCREASE_MARGIN)) {
375 IWL_DEBUG_TEMP(priv,
376 "Temperature increase %d "
377 "degree Celsius\n",
378 (temp - tt->tt_previous_temp));
379 }
380 tt->tt_previous_temp = temp;
381#endif
382 if (old_state !=
383 transaction->next_state) {
384 changed = true;
385 tt->state =
386 transaction->next_state;
387 }
388 break;
389 }
390 }
391 /* stop ct_kill_waiting_tm timer */
392 del_timer_sync(&priv->thermal_throttle.ct_kill_waiting_tm);
393 if (changed) {
394 if (tt->state >= IWL_TI_1) {
395 /* force PI = IWL_POWER_INDEX_5 in the case of TI > 0 */
396 tt->tt_power_mode = IWL_POWER_INDEX_5;
397
398 if (!iwl_ht_enabled(priv)) {
399 struct iwl_rxon_context *ctx;
400
401 for_each_context(priv, ctx) {
402 struct iwl_rxon_cmd *rxon;
403
404 rxon = &ctx->staging;
405
406 /* disable HT */
407 rxon->flags &= ~(
408 RXON_FLG_CHANNEL_MODE_MSK |
409 RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK |
410 RXON_FLG_HT40_PROT_MSK |
411 RXON_FLG_HT_PROT_MSK);
412 }
413 } else {
414 /* check HT capability and set
415 * according to the system HT capability
416 * in case get disabled before */
417 iwl_set_rxon_ht(priv, &priv->current_ht_config);
418 }
419
420 } else {
421 /*
422 * restore system power setting -- it will be
423 * recalculated automatically.
424 */
425
426 /* check HT capability and set
427 * according to the system HT capability
428 * in case get disabled before */
429 iwl_set_rxon_ht(priv, &priv->current_ht_config);
430 }
431 mutex_lock(&priv->mutex);
432 if (old_state == IWL_TI_CT_KILL)
433 clear_bit(STATUS_CT_KILL, &priv->status);
434 if (tt->state != IWL_TI_CT_KILL &&
435 iwl_power_update_mode(priv, true)) {
436 /* TT state not updated
437 * try again during next temperature read
438 */
439 IWL_ERR(priv, "Cannot update power mode, "
440 "TT state not updated\n");
441 if (old_state == IWL_TI_CT_KILL)
442 set_bit(STATUS_CT_KILL, &priv->status);
443 tt->state = old_state;
444 } else {
445 IWL_DEBUG_TEMP(priv,
446 "Thermal Throttling to new state: %u\n",
447 tt->state);
448 if (old_state != IWL_TI_CT_KILL &&
449 tt->state == IWL_TI_CT_KILL) {
450 if (force) {
451 IWL_DEBUG_TEMP(priv,
452 "Enter IWL_TI_CT_KILL\n");
453 set_bit(STATUS_CT_KILL, &priv->status);
454 iwl_perform_ct_kill_task(priv, true);
455 } else {
456 tt->state = old_state;
457 iwl_prepare_ct_kill_task(priv);
458 }
459 } else if (old_state == IWL_TI_CT_KILL &&
460 tt->state != IWL_TI_CT_KILL) {
461 IWL_DEBUG_TEMP(priv, "Exit IWL_TI_CT_KILL\n");
462 iwl_perform_ct_kill_task(priv, false);
463 }
464 }
465 mutex_unlock(&priv->mutex);
466 }
467}
468
469/* Card State Notification indicated reach critical temperature
470 * if PSP not enable, no Thermal Throttling function will be performed
471 * just set the GP1 bit to acknowledge the event
472 * otherwise, go into IWL_TI_CT_KILL state
473 * since Card State Notification will not provide any temperature reading
474 * for Legacy mode
475 * so just pass the CT_KILL temperature to iwl_legacy_tt_handler()
476 * for advance mode
477 * pass CT_KILL_THRESHOLD+1 to make sure move into IWL_TI_CT_KILL state
478 */
479static void iwl_bg_ct_enter(struct work_struct *work)
480{
481 struct iwl_priv *priv = container_of(work, struct iwl_priv, ct_enter);
482 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
483
484 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
485 return;
486
487 if (!iwl_is_ready(priv))
488 return;
489
490 if (tt->state != IWL_TI_CT_KILL) {
491 IWL_ERR(priv, "Device reached critical temperature "
492 "- ucode going to sleep!\n");
493 if (!priv->thermal_throttle.advanced_tt)
494 iwl_legacy_tt_handler(priv,
495 IWL_MINIMAL_POWER_THRESHOLD,
496 true);
497 else
498 iwl_advance_tt_handler(priv,
499 CT_KILL_THRESHOLD + 1, true);
500 }
501}
502
503/* Card State Notification indicated out of critical temperature
504 * since Card State Notification will not provide any temperature reading
505 * so pass the IWL_REDUCED_PERFORMANCE_THRESHOLD_2 temperature
506 * to iwl_legacy_tt_handler() to get out of IWL_CT_KILL state
507 */
508static void iwl_bg_ct_exit(struct work_struct *work)
509{
510 struct iwl_priv *priv = container_of(work, struct iwl_priv, ct_exit);
511 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
512
513 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
514 return;
515
516 if (!iwl_is_ready(priv))
517 return;
518
519 /* stop ct_kill_exit_tm timer */
520 del_timer_sync(&priv->thermal_throttle.ct_kill_exit_tm);
521
522 if (tt->state == IWL_TI_CT_KILL) {
523 IWL_ERR(priv,
524 "Device temperature below critical"
525 "- ucode awake!\n");
526 /*
527 * exit from CT_KILL state
528 * reset the current temperature reading
529 */
530 priv->temperature = 0;
531 if (!priv->thermal_throttle.advanced_tt)
532 iwl_legacy_tt_handler(priv,
533 IWL_REDUCED_PERFORMANCE_THRESHOLD_2,
534 true);
535 else
536 iwl_advance_tt_handler(priv, CT_KILL_EXIT_THRESHOLD,
537 true);
538 }
539}
540
541void iwl_tt_enter_ct_kill(struct iwl_priv *priv)
542{
543 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
544 return;
545
546 IWL_DEBUG_TEMP(priv, "Queueing critical temperature enter.\n");
547 queue_work(priv->workqueue, &priv->ct_enter);
548}
549
550void iwl_tt_exit_ct_kill(struct iwl_priv *priv)
551{
552 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
553 return;
554
555 IWL_DEBUG_TEMP(priv, "Queueing critical temperature exit.\n");
556 queue_work(priv->workqueue, &priv->ct_exit);
557}
558
559static void iwl_bg_tt_work(struct work_struct *work)
560{
561 struct iwl_priv *priv = container_of(work, struct iwl_priv, tt_work);
562 s32 temp = priv->temperature; /* degrees CELSIUS except specified */
563
564 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
565 return;
566
567 if (!priv->thermal_throttle.advanced_tt)
568 iwl_legacy_tt_handler(priv, temp, false);
569 else
570 iwl_advance_tt_handler(priv, temp, false);
571}
572
573void iwl_tt_handler(struct iwl_priv *priv)
574{
575 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
576 return;
577
578 IWL_DEBUG_TEMP(priv, "Queueing thermal throttling work.\n");
579 queue_work(priv->workqueue, &priv->tt_work);
580}
581
582/* Thermal throttling initialization
583 * For advance thermal throttling:
584 * Initialize Thermal Index and temperature threshold table
585 * Initialize thermal throttling restriction table
586 */
587void iwl_tt_initialize(struct iwl_priv *priv)
588{
589 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
590 int size = sizeof(struct iwl_tt_trans) * (IWL_TI_STATE_MAX - 1);
591 struct iwl_tt_trans *transaction;
592
593 IWL_DEBUG_TEMP(priv, "Initialize Thermal Throttling\n");
594
595 memset(tt, 0, sizeof(struct iwl_tt_mgmt));
596
597 tt->state = IWL_TI_0;
598 timer_setup(&priv->thermal_throttle.ct_kill_exit_tm,
599 iwl_tt_check_exit_ct_kill, 0);
600 timer_setup(&priv->thermal_throttle.ct_kill_waiting_tm,
601 iwl_tt_ready_for_ct_kill, 0);
602 /* setup deferred ct kill work */
603 INIT_WORK(&priv->tt_work, iwl_bg_tt_work);
604 INIT_WORK(&priv->ct_enter, iwl_bg_ct_enter);
605 INIT_WORK(&priv->ct_exit, iwl_bg_ct_exit);
606
607 if (priv->lib->adv_thermal_throttle) {
608 IWL_DEBUG_TEMP(priv, "Advanced Thermal Throttling\n");
609 tt->restriction = kcalloc(IWL_TI_STATE_MAX,
610 sizeof(struct iwl_tt_restriction),
611 GFP_KERNEL);
612 tt->transaction = kcalloc(IWL_TI_STATE_MAX *
613 (IWL_TI_STATE_MAX - 1),
614 sizeof(struct iwl_tt_trans),
615 GFP_KERNEL);
616 if (!tt->restriction || !tt->transaction) {
617 IWL_ERR(priv, "Fallback to Legacy Throttling\n");
618 priv->thermal_throttle.advanced_tt = false;
619 kfree(tt->restriction);
620 tt->restriction = NULL;
621 kfree(tt->transaction);
622 tt->transaction = NULL;
623 } else {
624 transaction = tt->transaction +
625 (IWL_TI_0 * (IWL_TI_STATE_MAX - 1));
626 memcpy(transaction, &tt_range_0[0], size);
627 transaction = tt->transaction +
628 (IWL_TI_1 * (IWL_TI_STATE_MAX - 1));
629 memcpy(transaction, &tt_range_1[0], size);
630 transaction = tt->transaction +
631 (IWL_TI_2 * (IWL_TI_STATE_MAX - 1));
632 memcpy(transaction, &tt_range_2[0], size);
633 transaction = tt->transaction +
634 (IWL_TI_CT_KILL * (IWL_TI_STATE_MAX - 1));
635 memcpy(transaction, &tt_range_3[0], size);
636 size = sizeof(struct iwl_tt_restriction) *
637 IWL_TI_STATE_MAX;
638 memcpy(tt->restriction,
639 &restriction_range[0], size);
640 priv->thermal_throttle.advanced_tt = true;
641 }
642 } else {
643 IWL_DEBUG_TEMP(priv, "Legacy Thermal Throttling\n");
644 priv->thermal_throttle.advanced_tt = false;
645 }
646}
647
648/* cleanup thermal throttling management related memory and timer */
649void iwl_tt_exit(struct iwl_priv *priv)
650{
651 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
652
653 /* stop ct_kill_exit_tm timer if activated */
654 del_timer_sync(&priv->thermal_throttle.ct_kill_exit_tm);
655 /* stop ct_kill_waiting_tm timer if activated */
656 del_timer_sync(&priv->thermal_throttle.ct_kill_waiting_tm);
657 cancel_work_sync(&priv->tt_work);
658 cancel_work_sync(&priv->ct_enter);
659 cancel_work_sync(&priv->ct_exit);
660
661 if (priv->thermal_throttle.advanced_tt) {
662 /* free advance thermal throttling memory */
663 kfree(tt->restriction);
664 tt->restriction = NULL;
665 kfree(tt->transaction);
666 tt->transaction = NULL;
667 }
668}
1/******************************************************************************
2 *
3 * Copyright(c) 2007 - 2014 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 <linuxwifi@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 <net/mac80211.h>
34#include "iwl-io.h"
35#include "iwl-modparams.h"
36#include "iwl-debug.h"
37#include "agn.h"
38#include "dev.h"
39#include "commands.h"
40#include "tt.h"
41
42/* default Thermal Throttling transaction table
43 * Current state | Throttling Down | Throttling Up
44 *=============================================================================
45 * Condition Nxt State Condition Nxt State Condition Nxt State
46 *-----------------------------------------------------------------------------
47 * IWL_TI_0 T >= 114 CT_KILL 114>T>=105 TI_1 N/A N/A
48 * IWL_TI_1 T >= 114 CT_KILL 114>T>=110 TI_2 T<=95 TI_0
49 * IWL_TI_2 T >= 114 CT_KILL T<=100 TI_1
50 * IWL_CT_KILL N/A N/A N/A N/A T<=95 TI_0
51 *=============================================================================
52 */
53static const struct iwl_tt_trans tt_range_0[IWL_TI_STATE_MAX - 1] = {
54 {IWL_TI_0, IWL_ABSOLUTE_ZERO, 104},
55 {IWL_TI_1, 105, CT_KILL_THRESHOLD - 1},
56 {IWL_TI_CT_KILL, CT_KILL_THRESHOLD, IWL_ABSOLUTE_MAX}
57};
58static const struct iwl_tt_trans tt_range_1[IWL_TI_STATE_MAX - 1] = {
59 {IWL_TI_0, IWL_ABSOLUTE_ZERO, 95},
60 {IWL_TI_2, 110, CT_KILL_THRESHOLD - 1},
61 {IWL_TI_CT_KILL, CT_KILL_THRESHOLD, IWL_ABSOLUTE_MAX}
62};
63static const struct iwl_tt_trans tt_range_2[IWL_TI_STATE_MAX - 1] = {
64 {IWL_TI_1, IWL_ABSOLUTE_ZERO, 100},
65 {IWL_TI_CT_KILL, CT_KILL_THRESHOLD, IWL_ABSOLUTE_MAX},
66 {IWL_TI_CT_KILL, CT_KILL_THRESHOLD, IWL_ABSOLUTE_MAX}
67};
68static const struct iwl_tt_trans tt_range_3[IWL_TI_STATE_MAX - 1] = {
69 {IWL_TI_0, IWL_ABSOLUTE_ZERO, CT_KILL_EXIT_THRESHOLD},
70 {IWL_TI_CT_KILL, CT_KILL_EXIT_THRESHOLD + 1, IWL_ABSOLUTE_MAX},
71 {IWL_TI_CT_KILL, CT_KILL_EXIT_THRESHOLD + 1, IWL_ABSOLUTE_MAX}
72};
73
74/* Advance Thermal Throttling default restriction table */
75static const struct iwl_tt_restriction restriction_range[IWL_TI_STATE_MAX] = {
76 {IWL_ANT_OK_MULTI, IWL_ANT_OK_MULTI, true },
77 {IWL_ANT_OK_SINGLE, IWL_ANT_OK_MULTI, true },
78 {IWL_ANT_OK_SINGLE, IWL_ANT_OK_SINGLE, false },
79 {IWL_ANT_OK_NONE, IWL_ANT_OK_NONE, false }
80};
81
82bool iwl_tt_is_low_power_state(struct iwl_priv *priv)
83{
84 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
85
86 if (tt->state >= IWL_TI_1)
87 return true;
88 return false;
89}
90
91u8 iwl_tt_current_power_mode(struct iwl_priv *priv)
92{
93 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
94
95 return tt->tt_power_mode;
96}
97
98bool iwl_ht_enabled(struct iwl_priv *priv)
99{
100 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
101 struct iwl_tt_restriction *restriction;
102
103 if (!priv->thermal_throttle.advanced_tt)
104 return true;
105 restriction = tt->restriction + tt->state;
106 return restriction->is_ht;
107}
108
109static bool iwl_within_ct_kill_margin(struct iwl_priv *priv)
110{
111 s32 temp = priv->temperature; /* degrees CELSIUS except specified */
112 bool within_margin = false;
113
114 if (!priv->thermal_throttle.advanced_tt)
115 within_margin = ((temp + IWL_TT_CT_KILL_MARGIN) >=
116 CT_KILL_THRESHOLD_LEGACY) ? true : false;
117 else
118 within_margin = ((temp + IWL_TT_CT_KILL_MARGIN) >=
119 CT_KILL_THRESHOLD) ? true : false;
120 return within_margin;
121}
122
123bool iwl_check_for_ct_kill(struct iwl_priv *priv)
124{
125 bool is_ct_kill = false;
126
127 if (iwl_within_ct_kill_margin(priv)) {
128 iwl_tt_enter_ct_kill(priv);
129 is_ct_kill = true;
130 }
131 return is_ct_kill;
132}
133
134enum iwl_antenna_ok iwl_tx_ant_restriction(struct iwl_priv *priv)
135{
136 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
137 struct iwl_tt_restriction *restriction;
138
139 if (!priv->thermal_throttle.advanced_tt)
140 return IWL_ANT_OK_MULTI;
141 restriction = tt->restriction + tt->state;
142 return restriction->tx_stream;
143}
144
145enum iwl_antenna_ok iwl_rx_ant_restriction(struct iwl_priv *priv)
146{
147 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
148 struct iwl_tt_restriction *restriction;
149
150 if (!priv->thermal_throttle.advanced_tt)
151 return IWL_ANT_OK_MULTI;
152 restriction = tt->restriction + tt->state;
153 return restriction->rx_stream;
154}
155
156#define CT_KILL_EXIT_DURATION (5) /* 5 seconds duration */
157#define CT_KILL_WAITING_DURATION (300) /* 300ms duration */
158
159/*
160 * toggle the bit to wake up uCode and check the temperature
161 * if the temperature is below CT, uCode will stay awake and send card
162 * state notification with CT_KILL bit clear to inform Thermal Throttling
163 * Management to change state. Otherwise, uCode will go back to sleep
164 * without doing anything, driver should continue the 5 seconds timer
165 * to wake up uCode for temperature check until temperature drop below CT
166 */
167static void iwl_tt_check_exit_ct_kill(struct timer_list *t)
168{
169 struct iwl_priv *priv = from_timer(priv, t,
170 thermal_throttle.ct_kill_exit_tm);
171 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
172 unsigned long flags;
173
174 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
175 return;
176
177 if (tt->state == IWL_TI_CT_KILL) {
178 if (priv->thermal_throttle.ct_kill_toggle) {
179 iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_CLR,
180 CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
181 priv->thermal_throttle.ct_kill_toggle = false;
182 } else {
183 iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_SET,
184 CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
185 priv->thermal_throttle.ct_kill_toggle = true;
186 }
187 iwl_read32(priv->trans, CSR_UCODE_DRV_GP1);
188 if (iwl_trans_grab_nic_access(priv->trans, &flags))
189 iwl_trans_release_nic_access(priv->trans, &flags);
190
191 /* Reschedule the ct_kill timer to occur in
192 * CT_KILL_EXIT_DURATION seconds to ensure we get a
193 * thermal update */
194 IWL_DEBUG_TEMP(priv, "schedule ct_kill exit timer\n");
195 mod_timer(&priv->thermal_throttle.ct_kill_exit_tm,
196 jiffies + CT_KILL_EXIT_DURATION * HZ);
197 }
198}
199
200static void iwl_perform_ct_kill_task(struct iwl_priv *priv,
201 bool stop)
202{
203 if (stop) {
204 IWL_DEBUG_TEMP(priv, "Stop all queues\n");
205 if (priv->mac80211_registered)
206 ieee80211_stop_queues(priv->hw);
207 IWL_DEBUG_TEMP(priv,
208 "Schedule 5 seconds CT_KILL Timer\n");
209 mod_timer(&priv->thermal_throttle.ct_kill_exit_tm,
210 jiffies + CT_KILL_EXIT_DURATION * HZ);
211 } else {
212 IWL_DEBUG_TEMP(priv, "Wake all queues\n");
213 if (priv->mac80211_registered)
214 ieee80211_wake_queues(priv->hw);
215 }
216}
217
218static void iwl_tt_ready_for_ct_kill(struct timer_list *t)
219{
220 struct iwl_priv *priv = from_timer(priv, t,
221 thermal_throttle.ct_kill_waiting_tm);
222 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
223
224 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
225 return;
226
227 /* temperature timer expired, ready to go into CT_KILL state */
228 if (tt->state != IWL_TI_CT_KILL) {
229 IWL_DEBUG_TEMP(priv, "entering CT_KILL state when "
230 "temperature timer expired\n");
231 tt->state = IWL_TI_CT_KILL;
232 set_bit(STATUS_CT_KILL, &priv->status);
233 iwl_perform_ct_kill_task(priv, true);
234 }
235}
236
237static void iwl_prepare_ct_kill_task(struct iwl_priv *priv)
238{
239 IWL_DEBUG_TEMP(priv, "Prepare to enter IWL_TI_CT_KILL\n");
240 /* make request to retrieve statistics information */
241 iwl_send_statistics_request(priv, 0, false);
242 /* Reschedule the ct_kill wait timer */
243 mod_timer(&priv->thermal_throttle.ct_kill_waiting_tm,
244 jiffies + msecs_to_jiffies(CT_KILL_WAITING_DURATION));
245}
246
247#define IWL_MINIMAL_POWER_THRESHOLD (CT_KILL_THRESHOLD_LEGACY)
248#define IWL_REDUCED_PERFORMANCE_THRESHOLD_2 (100)
249#define IWL_REDUCED_PERFORMANCE_THRESHOLD_1 (90)
250
251/*
252 * Legacy thermal throttling
253 * 1) Avoid NIC destruction due to high temperatures
254 * Chip will identify dangerously high temperatures that can
255 * harm the device and will power down
256 * 2) Avoid the NIC power down due to high temperature
257 * Throttle early enough to lower the power consumption before
258 * drastic steps are needed
259 */
260static void iwl_legacy_tt_handler(struct iwl_priv *priv, s32 temp, bool force)
261{
262 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
263 enum iwl_tt_state old_state;
264
265#ifdef CONFIG_IWLWIFI_DEBUG
266 if ((tt->tt_previous_temp) &&
267 (temp > tt->tt_previous_temp) &&
268 ((temp - tt->tt_previous_temp) >
269 IWL_TT_INCREASE_MARGIN)) {
270 IWL_DEBUG_TEMP(priv,
271 "Temperature increase %d degree Celsius\n",
272 (temp - tt->tt_previous_temp));
273 }
274#endif
275 old_state = tt->state;
276 /* in Celsius */
277 if (temp >= IWL_MINIMAL_POWER_THRESHOLD)
278 tt->state = IWL_TI_CT_KILL;
279 else if (temp >= IWL_REDUCED_PERFORMANCE_THRESHOLD_2)
280 tt->state = IWL_TI_2;
281 else if (temp >= IWL_REDUCED_PERFORMANCE_THRESHOLD_1)
282 tt->state = IWL_TI_1;
283 else
284 tt->state = IWL_TI_0;
285
286#ifdef CONFIG_IWLWIFI_DEBUG
287 tt->tt_previous_temp = temp;
288#endif
289 /* stop ct_kill_waiting_tm timer */
290 del_timer_sync(&priv->thermal_throttle.ct_kill_waiting_tm);
291 if (tt->state != old_state) {
292 switch (tt->state) {
293 case IWL_TI_0:
294 /*
295 * When the system is ready to go back to IWL_TI_0
296 * we only have to call iwl_power_update_mode() to
297 * do so.
298 */
299 break;
300 case IWL_TI_1:
301 tt->tt_power_mode = IWL_POWER_INDEX_3;
302 break;
303 case IWL_TI_2:
304 tt->tt_power_mode = IWL_POWER_INDEX_4;
305 break;
306 default:
307 tt->tt_power_mode = IWL_POWER_INDEX_5;
308 break;
309 }
310 mutex_lock(&priv->mutex);
311 if (old_state == IWL_TI_CT_KILL)
312 clear_bit(STATUS_CT_KILL, &priv->status);
313 if (tt->state != IWL_TI_CT_KILL &&
314 iwl_power_update_mode(priv, true)) {
315 /* TT state not updated
316 * try again during next temperature read
317 */
318 if (old_state == IWL_TI_CT_KILL)
319 set_bit(STATUS_CT_KILL, &priv->status);
320 tt->state = old_state;
321 IWL_ERR(priv, "Cannot update power mode, "
322 "TT state not updated\n");
323 } else {
324 if (tt->state == IWL_TI_CT_KILL) {
325 if (force) {
326 set_bit(STATUS_CT_KILL, &priv->status);
327 iwl_perform_ct_kill_task(priv, true);
328 } else {
329 iwl_prepare_ct_kill_task(priv);
330 tt->state = old_state;
331 }
332 } else if (old_state == IWL_TI_CT_KILL &&
333 tt->state != IWL_TI_CT_KILL)
334 iwl_perform_ct_kill_task(priv, false);
335 IWL_DEBUG_TEMP(priv, "Temperature state changed %u\n",
336 tt->state);
337 IWL_DEBUG_TEMP(priv, "Power Index change to %u\n",
338 tt->tt_power_mode);
339 }
340 mutex_unlock(&priv->mutex);
341 }
342}
343
344/*
345 * Advance thermal throttling
346 * 1) Avoid NIC destruction due to high temperatures
347 * Chip will identify dangerously high temperatures that can
348 * harm the device and will power down
349 * 2) Avoid the NIC power down due to high temperature
350 * Throttle early enough to lower the power consumption before
351 * drastic steps are needed
352 * Actions include relaxing the power down sleep thresholds and
353 * decreasing the number of TX streams
354 * 3) Avoid throughput performance impact as much as possible
355 *
356 *=============================================================================
357 * Condition Nxt State Condition Nxt State Condition Nxt State
358 *-----------------------------------------------------------------------------
359 * IWL_TI_0 T >= 114 CT_KILL 114>T>=105 TI_1 N/A N/A
360 * IWL_TI_1 T >= 114 CT_KILL 114>T>=110 TI_2 T<=95 TI_0
361 * IWL_TI_2 T >= 114 CT_KILL T<=100 TI_1
362 * IWL_CT_KILL N/A N/A N/A N/A T<=95 TI_0
363 *=============================================================================
364 */
365static void iwl_advance_tt_handler(struct iwl_priv *priv, s32 temp, bool force)
366{
367 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
368 int i;
369 bool changed = false;
370 enum iwl_tt_state old_state;
371 struct iwl_tt_trans *transaction;
372
373 old_state = tt->state;
374 for (i = 0; i < IWL_TI_STATE_MAX - 1; i++) {
375 /* based on the current TT state,
376 * find the curresponding transaction table
377 * each table has (IWL_TI_STATE_MAX - 1) entries
378 * tt->transaction + ((old_state * (IWL_TI_STATE_MAX - 1))
379 * will advance to the correct table.
380 * then based on the current temperature
381 * find the next state need to transaction to
382 * go through all the possible (IWL_TI_STATE_MAX - 1) entries
383 * in the current table to see if transaction is needed
384 */
385 transaction = tt->transaction +
386 ((old_state * (IWL_TI_STATE_MAX - 1)) + i);
387 if (temp >= transaction->tt_low &&
388 temp <= transaction->tt_high) {
389#ifdef CONFIG_IWLWIFI_DEBUG
390 if ((tt->tt_previous_temp) &&
391 (temp > tt->tt_previous_temp) &&
392 ((temp - tt->tt_previous_temp) >
393 IWL_TT_INCREASE_MARGIN)) {
394 IWL_DEBUG_TEMP(priv,
395 "Temperature increase %d "
396 "degree Celsius\n",
397 (temp - tt->tt_previous_temp));
398 }
399 tt->tt_previous_temp = temp;
400#endif
401 if (old_state !=
402 transaction->next_state) {
403 changed = true;
404 tt->state =
405 transaction->next_state;
406 }
407 break;
408 }
409 }
410 /* stop ct_kill_waiting_tm timer */
411 del_timer_sync(&priv->thermal_throttle.ct_kill_waiting_tm);
412 if (changed) {
413 if (tt->state >= IWL_TI_1) {
414 /* force PI = IWL_POWER_INDEX_5 in the case of TI > 0 */
415 tt->tt_power_mode = IWL_POWER_INDEX_5;
416
417 if (!iwl_ht_enabled(priv)) {
418 struct iwl_rxon_context *ctx;
419
420 for_each_context(priv, ctx) {
421 struct iwl_rxon_cmd *rxon;
422
423 rxon = &ctx->staging;
424
425 /* disable HT */
426 rxon->flags &= ~(
427 RXON_FLG_CHANNEL_MODE_MSK |
428 RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK |
429 RXON_FLG_HT40_PROT_MSK |
430 RXON_FLG_HT_PROT_MSK);
431 }
432 } else {
433 /* check HT capability and set
434 * according to the system HT capability
435 * in case get disabled before */
436 iwl_set_rxon_ht(priv, &priv->current_ht_config);
437 }
438
439 } else {
440 /*
441 * restore system power setting -- it will be
442 * recalculated automatically.
443 */
444
445 /* check HT capability and set
446 * according to the system HT capability
447 * in case get disabled before */
448 iwl_set_rxon_ht(priv, &priv->current_ht_config);
449 }
450 mutex_lock(&priv->mutex);
451 if (old_state == IWL_TI_CT_KILL)
452 clear_bit(STATUS_CT_KILL, &priv->status);
453 if (tt->state != IWL_TI_CT_KILL &&
454 iwl_power_update_mode(priv, true)) {
455 /* TT state not updated
456 * try again during next temperature read
457 */
458 IWL_ERR(priv, "Cannot update power mode, "
459 "TT state not updated\n");
460 if (old_state == IWL_TI_CT_KILL)
461 set_bit(STATUS_CT_KILL, &priv->status);
462 tt->state = old_state;
463 } else {
464 IWL_DEBUG_TEMP(priv,
465 "Thermal Throttling to new state: %u\n",
466 tt->state);
467 if (old_state != IWL_TI_CT_KILL &&
468 tt->state == IWL_TI_CT_KILL) {
469 if (force) {
470 IWL_DEBUG_TEMP(priv,
471 "Enter IWL_TI_CT_KILL\n");
472 set_bit(STATUS_CT_KILL, &priv->status);
473 iwl_perform_ct_kill_task(priv, true);
474 } else {
475 tt->state = old_state;
476 iwl_prepare_ct_kill_task(priv);
477 }
478 } else if (old_state == IWL_TI_CT_KILL &&
479 tt->state != IWL_TI_CT_KILL) {
480 IWL_DEBUG_TEMP(priv, "Exit IWL_TI_CT_KILL\n");
481 iwl_perform_ct_kill_task(priv, false);
482 }
483 }
484 mutex_unlock(&priv->mutex);
485 }
486}
487
488/* Card State Notification indicated reach critical temperature
489 * if PSP not enable, no Thermal Throttling function will be performed
490 * just set the GP1 bit to acknowledge the event
491 * otherwise, go into IWL_TI_CT_KILL state
492 * since Card State Notification will not provide any temperature reading
493 * for Legacy mode
494 * so just pass the CT_KILL temperature to iwl_legacy_tt_handler()
495 * for advance mode
496 * pass CT_KILL_THRESHOLD+1 to make sure move into IWL_TI_CT_KILL state
497 */
498static void iwl_bg_ct_enter(struct work_struct *work)
499{
500 struct iwl_priv *priv = container_of(work, struct iwl_priv, ct_enter);
501 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
502
503 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
504 return;
505
506 if (!iwl_is_ready(priv))
507 return;
508
509 if (tt->state != IWL_TI_CT_KILL) {
510 IWL_ERR(priv, "Device reached critical temperature "
511 "- ucode going to sleep!\n");
512 if (!priv->thermal_throttle.advanced_tt)
513 iwl_legacy_tt_handler(priv,
514 IWL_MINIMAL_POWER_THRESHOLD,
515 true);
516 else
517 iwl_advance_tt_handler(priv,
518 CT_KILL_THRESHOLD + 1, true);
519 }
520}
521
522/* Card State Notification indicated out of critical temperature
523 * since Card State Notification will not provide any temperature reading
524 * so pass the IWL_REDUCED_PERFORMANCE_THRESHOLD_2 temperature
525 * to iwl_legacy_tt_handler() to get out of IWL_CT_KILL state
526 */
527static void iwl_bg_ct_exit(struct work_struct *work)
528{
529 struct iwl_priv *priv = container_of(work, struct iwl_priv, ct_exit);
530 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
531
532 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
533 return;
534
535 if (!iwl_is_ready(priv))
536 return;
537
538 /* stop ct_kill_exit_tm timer */
539 del_timer_sync(&priv->thermal_throttle.ct_kill_exit_tm);
540
541 if (tt->state == IWL_TI_CT_KILL) {
542 IWL_ERR(priv,
543 "Device temperature below critical"
544 "- ucode awake!\n");
545 /*
546 * exit from CT_KILL state
547 * reset the current temperature reading
548 */
549 priv->temperature = 0;
550 if (!priv->thermal_throttle.advanced_tt)
551 iwl_legacy_tt_handler(priv,
552 IWL_REDUCED_PERFORMANCE_THRESHOLD_2,
553 true);
554 else
555 iwl_advance_tt_handler(priv, CT_KILL_EXIT_THRESHOLD,
556 true);
557 }
558}
559
560void iwl_tt_enter_ct_kill(struct iwl_priv *priv)
561{
562 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
563 return;
564
565 IWL_DEBUG_TEMP(priv, "Queueing critical temperature enter.\n");
566 queue_work(priv->workqueue, &priv->ct_enter);
567}
568
569void iwl_tt_exit_ct_kill(struct iwl_priv *priv)
570{
571 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
572 return;
573
574 IWL_DEBUG_TEMP(priv, "Queueing critical temperature exit.\n");
575 queue_work(priv->workqueue, &priv->ct_exit);
576}
577
578static void iwl_bg_tt_work(struct work_struct *work)
579{
580 struct iwl_priv *priv = container_of(work, struct iwl_priv, tt_work);
581 s32 temp = priv->temperature; /* degrees CELSIUS except specified */
582
583 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
584 return;
585
586 if (!priv->thermal_throttle.advanced_tt)
587 iwl_legacy_tt_handler(priv, temp, false);
588 else
589 iwl_advance_tt_handler(priv, temp, false);
590}
591
592void iwl_tt_handler(struct iwl_priv *priv)
593{
594 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
595 return;
596
597 IWL_DEBUG_TEMP(priv, "Queueing thermal throttling work.\n");
598 queue_work(priv->workqueue, &priv->tt_work);
599}
600
601/* Thermal throttling initialization
602 * For advance thermal throttling:
603 * Initialize Thermal Index and temperature threshold table
604 * Initialize thermal throttling restriction table
605 */
606void iwl_tt_initialize(struct iwl_priv *priv)
607{
608 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
609 int size = sizeof(struct iwl_tt_trans) * (IWL_TI_STATE_MAX - 1);
610 struct iwl_tt_trans *transaction;
611
612 IWL_DEBUG_TEMP(priv, "Initialize Thermal Throttling\n");
613
614 memset(tt, 0, sizeof(struct iwl_tt_mgmt));
615
616 tt->state = IWL_TI_0;
617 timer_setup(&priv->thermal_throttle.ct_kill_exit_tm,
618 iwl_tt_check_exit_ct_kill, 0);
619 timer_setup(&priv->thermal_throttle.ct_kill_waiting_tm,
620 iwl_tt_ready_for_ct_kill, 0);
621 /* setup deferred ct kill work */
622 INIT_WORK(&priv->tt_work, iwl_bg_tt_work);
623 INIT_WORK(&priv->ct_enter, iwl_bg_ct_enter);
624 INIT_WORK(&priv->ct_exit, iwl_bg_ct_exit);
625
626 if (priv->lib->adv_thermal_throttle) {
627 IWL_DEBUG_TEMP(priv, "Advanced Thermal Throttling\n");
628 tt->restriction = kcalloc(IWL_TI_STATE_MAX,
629 sizeof(struct iwl_tt_restriction),
630 GFP_KERNEL);
631 tt->transaction = kcalloc(IWL_TI_STATE_MAX *
632 (IWL_TI_STATE_MAX - 1),
633 sizeof(struct iwl_tt_trans),
634 GFP_KERNEL);
635 if (!tt->restriction || !tt->transaction) {
636 IWL_ERR(priv, "Fallback to Legacy Throttling\n");
637 priv->thermal_throttle.advanced_tt = false;
638 kfree(tt->restriction);
639 tt->restriction = NULL;
640 kfree(tt->transaction);
641 tt->transaction = NULL;
642 } else {
643 transaction = tt->transaction +
644 (IWL_TI_0 * (IWL_TI_STATE_MAX - 1));
645 memcpy(transaction, &tt_range_0[0], size);
646 transaction = tt->transaction +
647 (IWL_TI_1 * (IWL_TI_STATE_MAX - 1));
648 memcpy(transaction, &tt_range_1[0], size);
649 transaction = tt->transaction +
650 (IWL_TI_2 * (IWL_TI_STATE_MAX - 1));
651 memcpy(transaction, &tt_range_2[0], size);
652 transaction = tt->transaction +
653 (IWL_TI_CT_KILL * (IWL_TI_STATE_MAX - 1));
654 memcpy(transaction, &tt_range_3[0], size);
655 size = sizeof(struct iwl_tt_restriction) *
656 IWL_TI_STATE_MAX;
657 memcpy(tt->restriction,
658 &restriction_range[0], size);
659 priv->thermal_throttle.advanced_tt = true;
660 }
661 } else {
662 IWL_DEBUG_TEMP(priv, "Legacy Thermal Throttling\n");
663 priv->thermal_throttle.advanced_tt = false;
664 }
665}
666
667/* cleanup thermal throttling management related memory and timer */
668void iwl_tt_exit(struct iwl_priv *priv)
669{
670 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
671
672 /* stop ct_kill_exit_tm timer if activated */
673 del_timer_sync(&priv->thermal_throttle.ct_kill_exit_tm);
674 /* stop ct_kill_waiting_tm timer if activated */
675 del_timer_sync(&priv->thermal_throttle.ct_kill_waiting_tm);
676 cancel_work_sync(&priv->tt_work);
677 cancel_work_sync(&priv->ct_enter);
678 cancel_work_sync(&priv->ct_exit);
679
680 if (priv->thermal_throttle.advanced_tt) {
681 /* free advance thermal throttling memory */
682 kfree(tt->restriction);
683 tt->restriction = NULL;
684 kfree(tt->transaction);
685 tt->transaction = NULL;
686 }
687}