1 /******************************************************************************
2 *
3 * Copyright(c) 2007 - 2012 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-agn.h"
38 #include "iwl-eeprom.h"
39 #include "iwl-dev.h"
40 #include "iwl-core.h"
41 #include "iwl-io.h"
42 #include "iwl-commands.h"
43 #include "iwl-debug.h"
44 #include "iwl-agn-tt.h"
45
46 /* default Thermal Throttling transaction table
47 * Current state | Throttling Down | Throttling Up
48 *=============================================================================
49 * Condition Nxt State Condition Nxt State Condition Nxt State
50 *-----------------------------------------------------------------------------
51 * IWL_TI_0 T >= 114 CT_KILL 114>T>=105 TI_1 N/A N/A
52 * IWL_TI_1 T >= 114 CT_KILL 114>T>=110 TI_2 T<=95 TI_0
53 * IWL_TI_2 T >= 114 CT_KILL T<=100 TI_1
54 * IWL_CT_KILL N/A N/A N/A N/A T<=95 TI_0
55 *=============================================================================
56 */
57 static const struct iwl_tt_trans tt_range_0[IWL_TI_STATE_MAX - 1] = {
58 {IWL_TI_0, IWL_ABSOLUTE_ZERO, 104},
59 {IWL_TI_1, 105, CT_KILL_THRESHOLD - 1},
60 {IWL_TI_CT_KILL, CT_KILL_THRESHOLD, IWL_ABSOLUTE_MAX}
61 };
62 static const struct iwl_tt_trans tt_range_1[IWL_TI_STATE_MAX - 1] = {
63 {IWL_TI_0, IWL_ABSOLUTE_ZERO, 95},
64 {IWL_TI_2, 110, CT_KILL_THRESHOLD - 1},
65 {IWL_TI_CT_KILL, CT_KILL_THRESHOLD, IWL_ABSOLUTE_MAX}
66 };
67 static const struct iwl_tt_trans tt_range_2[IWL_TI_STATE_MAX - 1] = {
68 {IWL_TI_1, IWL_ABSOLUTE_ZERO, 100},
69 {IWL_TI_CT_KILL, CT_KILL_THRESHOLD, IWL_ABSOLUTE_MAX},
70 {IWL_TI_CT_KILL, CT_KILL_THRESHOLD, IWL_ABSOLUTE_MAX}
71 };
72 static const struct iwl_tt_trans tt_range_3[IWL_TI_STATE_MAX - 1] = {
73 {IWL_TI_0, IWL_ABSOLUTE_ZERO, CT_KILL_EXIT_THRESHOLD},
74 {IWL_TI_CT_KILL, CT_KILL_EXIT_THRESHOLD + 1, IWL_ABSOLUTE_MAX},
75 {IWL_TI_CT_KILL, CT_KILL_EXIT_THRESHOLD + 1, IWL_ABSOLUTE_MAX}
76 };
77
78 /* Advance Thermal Throttling default restriction table */
79 static const struct iwl_tt_restriction restriction_range[IWL_TI_STATE_MAX] = {
80 {IWL_ANT_OK_MULTI, IWL_ANT_OK_MULTI, true },
81 {IWL_ANT_OK_SINGLE, IWL_ANT_OK_MULTI, true },
82 {IWL_ANT_OK_SINGLE, IWL_ANT_OK_SINGLE, false },
83 {IWL_ANT_OK_NONE, IWL_ANT_OK_NONE, false }
84 };
85
iwl_tt_is_low_power_state(struct iwl_priv * priv)86 bool iwl_tt_is_low_power_state(struct iwl_priv *priv)
87 {
88 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
89
90 if (tt->state >= IWL_TI_1)
91 return true;
92 return false;
93 }
94
iwl_tt_current_power_mode(struct iwl_priv * priv)95 u8 iwl_tt_current_power_mode(struct iwl_priv *priv)
96 {
97 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
98
99 return tt->tt_power_mode;
100 }
101
iwl_ht_enabled(struct iwl_priv * priv)102 bool iwl_ht_enabled(struct iwl_priv *priv)
103 {
104 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
105 struct iwl_tt_restriction *restriction;
106
107 if (!priv->thermal_throttle.advanced_tt)
108 return true;
109 restriction = tt->restriction + tt->state;
110 return restriction->is_ht;
111 }
112
iwl_within_ct_kill_margin(struct iwl_priv * priv)113 static bool iwl_within_ct_kill_margin(struct iwl_priv *priv)
114 {
115 s32 temp = priv->temperature; /* degrees CELSIUS except specified */
116 bool within_margin = false;
117
118 if (!priv->thermal_throttle.advanced_tt)
119 within_margin = ((temp + IWL_TT_CT_KILL_MARGIN) >=
120 CT_KILL_THRESHOLD_LEGACY) ? true : false;
121 else
122 within_margin = ((temp + IWL_TT_CT_KILL_MARGIN) >=
123 CT_KILL_THRESHOLD) ? true : false;
124 return within_margin;
125 }
126
iwl_check_for_ct_kill(struct iwl_priv * priv)127 bool iwl_check_for_ct_kill(struct iwl_priv *priv)
128 {
129 bool is_ct_kill = false;
130
131 if (iwl_within_ct_kill_margin(priv)) {
132 iwl_tt_enter_ct_kill(priv);
133 is_ct_kill = true;
134 }
135 return is_ct_kill;
136 }
137
iwl_tx_ant_restriction(struct iwl_priv * priv)138 enum iwl_antenna_ok iwl_tx_ant_restriction(struct iwl_priv *priv)
139 {
140 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
141 struct iwl_tt_restriction *restriction;
142
143 if (!priv->thermal_throttle.advanced_tt)
144 return IWL_ANT_OK_MULTI;
145 restriction = tt->restriction + tt->state;
146 return restriction->tx_stream;
147 }
148
iwl_rx_ant_restriction(struct iwl_priv * priv)149 enum iwl_antenna_ok iwl_rx_ant_restriction(struct iwl_priv *priv)
150 {
151 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
152 struct iwl_tt_restriction *restriction;
153
154 if (!priv->thermal_throttle.advanced_tt)
155 return IWL_ANT_OK_MULTI;
156 restriction = tt->restriction + tt->state;
157 return restriction->rx_stream;
158 }
159
160 #define CT_KILL_EXIT_DURATION (5) /* 5 seconds duration */
161 #define CT_KILL_WAITING_DURATION (300) /* 300ms duration */
162
163 /*
164 * toggle the bit to wake up uCode and check the temperature
165 * if the temperature is below CT, uCode will stay awake and send card
166 * state notification with CT_KILL bit clear to inform Thermal Throttling
167 * Management to change state. Otherwise, uCode will go back to sleep
168 * without doing anything, driver should continue the 5 seconds timer
169 * to wake up uCode for temperature check until temperature drop below CT
170 */
iwl_tt_check_exit_ct_kill(unsigned long data)171 static void iwl_tt_check_exit_ct_kill(unsigned long data)
172 {
173 struct iwl_priv *priv = (struct iwl_priv *)data;
174 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
175 unsigned long flags;
176
177 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
178 return;
179
180 if (tt->state == IWL_TI_CT_KILL) {
181 if (priv->thermal_throttle.ct_kill_toggle) {
182 iwl_write32(trans(priv), CSR_UCODE_DRV_GP1_CLR,
183 CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
184 priv->thermal_throttle.ct_kill_toggle = false;
185 } else {
186 iwl_write32(trans(priv), CSR_UCODE_DRV_GP1_SET,
187 CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
188 priv->thermal_throttle.ct_kill_toggle = true;
189 }
190 iwl_read32(trans(priv), CSR_UCODE_DRV_GP1);
191 spin_lock_irqsave(&trans(priv)->reg_lock, flags);
192 if (likely(iwl_grab_nic_access(trans(priv))))
193 iwl_release_nic_access(trans(priv));
194 spin_unlock_irqrestore(&trans(priv)->reg_lock, flags);
195
196 /* Reschedule the ct_kill timer to occur in
197 * CT_KILL_EXIT_DURATION seconds to ensure we get a
198 * thermal update */
199 IWL_DEBUG_TEMP(priv, "schedule ct_kill exit timer\n");
200 mod_timer(&priv->thermal_throttle.ct_kill_exit_tm,
201 jiffies + CT_KILL_EXIT_DURATION * HZ);
202 }
203 }
204
iwl_perform_ct_kill_task(struct iwl_priv * priv,bool stop)205 static void iwl_perform_ct_kill_task(struct iwl_priv *priv,
206 bool stop)
207 {
208 if (stop) {
209 IWL_DEBUG_TEMP(priv, "Stop all queues\n");
210 if (priv->mac80211_registered)
211 ieee80211_stop_queues(priv->hw);
212 IWL_DEBUG_TEMP(priv,
213 "Schedule 5 seconds CT_KILL Timer\n");
214 mod_timer(&priv->thermal_throttle.ct_kill_exit_tm,
215 jiffies + CT_KILL_EXIT_DURATION * HZ);
216 } else {
217 IWL_DEBUG_TEMP(priv, "Wake all queues\n");
218 if (priv->mac80211_registered)
219 ieee80211_wake_queues(priv->hw);
220 }
221 }
222
iwl_tt_ready_for_ct_kill(unsigned long data)223 static void iwl_tt_ready_for_ct_kill(unsigned long data)
224 {
225 struct iwl_priv *priv = (struct iwl_priv *)data;
226 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
227
228 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
229 return;
230
231 /* temperature timer expired, ready to go into CT_KILL state */
232 if (tt->state != IWL_TI_CT_KILL) {
233 IWL_DEBUG_TEMP(priv, "entering CT_KILL state when "
234 "temperature timer expired\n");
235 tt->state = IWL_TI_CT_KILL;
236 set_bit(STATUS_CT_KILL, &priv->status);
237 iwl_perform_ct_kill_task(priv, true);
238 }
239 }
240
iwl_prepare_ct_kill_task(struct iwl_priv * priv)241 static void iwl_prepare_ct_kill_task(struct iwl_priv *priv)
242 {
243 IWL_DEBUG_TEMP(priv, "Prepare to enter IWL_TI_CT_KILL\n");
244 /* make request to retrieve statistics information */
245 iwl_send_statistics_request(priv, CMD_SYNC, false);
246 /* Reschedule the ct_kill wait timer */
247 mod_timer(&priv->thermal_throttle.ct_kill_waiting_tm,
248 jiffies + msecs_to_jiffies(CT_KILL_WAITING_DURATION));
249 }
250
251 #define IWL_MINIMAL_POWER_THRESHOLD (CT_KILL_THRESHOLD_LEGACY)
252 #define IWL_REDUCED_PERFORMANCE_THRESHOLD_2 (100)
253 #define IWL_REDUCED_PERFORMANCE_THRESHOLD_1 (90)
254
255 /*
256 * Legacy thermal throttling
257 * 1) Avoid NIC destruction due to high temperatures
258 * Chip will identify dangerously high temperatures that can
259 * harm the device and will power down
260 * 2) Avoid the NIC power down due to high temperature
261 * Throttle early enough to lower the power consumption before
262 * drastic steps are needed
263 */
iwl_legacy_tt_handler(struct iwl_priv * priv,s32 temp,bool force)264 static void iwl_legacy_tt_handler(struct iwl_priv *priv, s32 temp, bool force)
265 {
266 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
267 enum iwl_tt_state old_state;
268
269 #ifdef CONFIG_IWLWIFI_DEBUG
270 if ((tt->tt_previous_temp) &&
271 (temp > tt->tt_previous_temp) &&
272 ((temp - tt->tt_previous_temp) >
273 IWL_TT_INCREASE_MARGIN)) {
274 IWL_DEBUG_TEMP(priv,
275 "Temperature increase %d degree Celsius\n",
276 (temp - tt->tt_previous_temp));
277 }
278 #endif
279 old_state = tt->state;
280 /* in Celsius */
281 if (temp >= IWL_MINIMAL_POWER_THRESHOLD)
282 tt->state = IWL_TI_CT_KILL;
283 else if (temp >= IWL_REDUCED_PERFORMANCE_THRESHOLD_2)
284 tt->state = IWL_TI_2;
285 else if (temp >= IWL_REDUCED_PERFORMANCE_THRESHOLD_1)
286 tt->state = IWL_TI_1;
287 else
288 tt->state = IWL_TI_0;
289
290 #ifdef CONFIG_IWLWIFI_DEBUG
291 tt->tt_previous_temp = temp;
292 #endif
293 /* stop ct_kill_waiting_tm timer */
294 del_timer_sync(&priv->thermal_throttle.ct_kill_waiting_tm);
295 if (tt->state != old_state) {
296 switch (tt->state) {
297 case IWL_TI_0:
298 /*
299 * When the system is ready to go back to IWL_TI_0
300 * we only have to call iwl_power_update_mode() to
301 * do so.
302 */
303 break;
304 case IWL_TI_1:
305 tt->tt_power_mode = IWL_POWER_INDEX_3;
306 break;
307 case IWL_TI_2:
308 tt->tt_power_mode = IWL_POWER_INDEX_4;
309 break;
310 default:
311 tt->tt_power_mode = IWL_POWER_INDEX_5;
312 break;
313 }
314 mutex_lock(&priv->mutex);
315 if (old_state == IWL_TI_CT_KILL)
316 clear_bit(STATUS_CT_KILL, &priv->status);
317 if (tt->state != IWL_TI_CT_KILL &&
318 iwl_power_update_mode(priv, true)) {
319 /* TT state not updated
320 * try again during next temperature read
321 */
322 if (old_state == IWL_TI_CT_KILL)
323 set_bit(STATUS_CT_KILL, &priv->status);
324 tt->state = old_state;
325 IWL_ERR(priv, "Cannot update power mode, "
326 "TT state not updated\n");
327 } else {
328 if (tt->state == IWL_TI_CT_KILL) {
329 if (force) {
330 set_bit(STATUS_CT_KILL, &priv->status);
331 iwl_perform_ct_kill_task(priv, true);
332 } else {
333 iwl_prepare_ct_kill_task(priv);
334 tt->state = old_state;
335 }
336 } else if (old_state == IWL_TI_CT_KILL &&
337 tt->state != IWL_TI_CT_KILL)
338 iwl_perform_ct_kill_task(priv, false);
339 IWL_DEBUG_TEMP(priv, "Temperature state changed %u\n",
340 tt->state);
341 IWL_DEBUG_TEMP(priv, "Power Index change to %u\n",
342 tt->tt_power_mode);
343 }
344 mutex_unlock(&priv->mutex);
345 }
346 }
347
348 /*
349 * Advance thermal throttling
350 * 1) Avoid NIC destruction due to high temperatures
351 * Chip will identify dangerously high temperatures that can
352 * harm the device and will power down
353 * 2) Avoid the NIC power down due to high temperature
354 * Throttle early enough to lower the power consumption before
355 * drastic steps are needed
356 * Actions include relaxing the power down sleep thresholds and
357 * decreasing the number of TX streams
358 * 3) Avoid throughput performance impact as much as possible
359 *
360 *=============================================================================
361 * Condition Nxt State Condition Nxt State Condition Nxt State
362 *-----------------------------------------------------------------------------
363 * IWL_TI_0 T >= 114 CT_KILL 114>T>=105 TI_1 N/A N/A
364 * IWL_TI_1 T >= 114 CT_KILL 114>T>=110 TI_2 T<=95 TI_0
365 * IWL_TI_2 T >= 114 CT_KILL T<=100 TI_1
366 * IWL_CT_KILL N/A N/A N/A N/A T<=95 TI_0
367 *=============================================================================
368 */
iwl_advance_tt_handler(struct iwl_priv * priv,s32 temp,bool force)369 static void iwl_advance_tt_handler(struct iwl_priv *priv, s32 temp, bool force)
370 {
371 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
372 int i;
373 bool changed = false;
374 enum iwl_tt_state old_state;
375 struct iwl_tt_trans *transaction;
376
377 old_state = tt->state;
378 for (i = 0; i < IWL_TI_STATE_MAX - 1; i++) {
379 /* based on the current TT state,
380 * find the curresponding transaction table
381 * each table has (IWL_TI_STATE_MAX - 1) entries
382 * tt->transaction + ((old_state * (IWL_TI_STATE_MAX - 1))
383 * will advance to the correct table.
384 * then based on the current temperature
385 * find the next state need to transaction to
386 * go through all the possible (IWL_TI_STATE_MAX - 1) entries
387 * in the current table to see if transaction is needed
388 */
389 transaction = tt->transaction +
390 ((old_state * (IWL_TI_STATE_MAX - 1)) + i);
391 if (temp >= transaction->tt_low &&
392 temp <= transaction->tt_high) {
393 #ifdef CONFIG_IWLWIFI_DEBUG
394 if ((tt->tt_previous_temp) &&
395 (temp > tt->tt_previous_temp) &&
396 ((temp - tt->tt_previous_temp) >
397 IWL_TT_INCREASE_MARGIN)) {
398 IWL_DEBUG_TEMP(priv,
399 "Temperature increase %d "
400 "degree Celsius\n",
401 (temp - tt->tt_previous_temp));
402 }
403 tt->tt_previous_temp = temp;
404 #endif
405 if (old_state !=
406 transaction->next_state) {
407 changed = true;
408 tt->state =
409 transaction->next_state;
410 }
411 break;
412 }
413 }
414 /* stop ct_kill_waiting_tm timer */
415 del_timer_sync(&priv->thermal_throttle.ct_kill_waiting_tm);
416 if (changed) {
417 if (tt->state >= IWL_TI_1) {
418 /* force PI = IWL_POWER_INDEX_5 in the case of TI > 0 */
419 tt->tt_power_mode = IWL_POWER_INDEX_5;
420
421 if (!iwl_ht_enabled(priv)) {
422 struct iwl_rxon_context *ctx;
423
424 for_each_context(priv, ctx) {
425 struct iwl_rxon_cmd *rxon;
426
427 rxon = &ctx->staging;
428
429 /* disable HT */
430 rxon->flags &= ~(
431 RXON_FLG_CHANNEL_MODE_MSK |
432 RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK |
433 RXON_FLG_HT40_PROT_MSK |
434 RXON_FLG_HT_PROT_MSK);
435 }
436 } else {
437 /* check HT capability and set
438 * according to the system HT capability
439 * in case get disabled before */
440 iwl_set_rxon_ht(priv, &priv->current_ht_config);
441 }
442
443 } else {
444 /*
445 * restore system power setting -- it will be
446 * recalculated automatically.
447 */
448
449 /* check HT capability and set
450 * according to the system HT capability
451 * in case get disabled before */
452 iwl_set_rxon_ht(priv, &priv->current_ht_config);
453 }
454 mutex_lock(&priv->mutex);
455 if (old_state == IWL_TI_CT_KILL)
456 clear_bit(STATUS_CT_KILL, &priv->status);
457 if (tt->state != IWL_TI_CT_KILL &&
458 iwl_power_update_mode(priv, true)) {
459 /* TT state not updated
460 * try again during next temperature read
461 */
462 IWL_ERR(priv, "Cannot update power mode, "
463 "TT state not updated\n");
464 if (old_state == IWL_TI_CT_KILL)
465 set_bit(STATUS_CT_KILL, &priv->status);
466 tt->state = old_state;
467 } else {
468 IWL_DEBUG_TEMP(priv,
469 "Thermal Throttling to new state: %u\n",
470 tt->state);
471 if (old_state != IWL_TI_CT_KILL &&
472 tt->state == IWL_TI_CT_KILL) {
473 if (force) {
474 IWL_DEBUG_TEMP(priv,
475 "Enter IWL_TI_CT_KILL\n");
476 set_bit(STATUS_CT_KILL, &priv->status);
477 iwl_perform_ct_kill_task(priv, true);
478 } else {
479 iwl_prepare_ct_kill_task(priv);
480 tt->state = old_state;
481 }
482 } else if (old_state == IWL_TI_CT_KILL &&
483 tt->state != IWL_TI_CT_KILL) {
484 IWL_DEBUG_TEMP(priv, "Exit IWL_TI_CT_KILL\n");
485 iwl_perform_ct_kill_task(priv, false);
486 }
487 }
488 mutex_unlock(&priv->mutex);
489 }
490 }
491
492 /* Card State Notification indicated reach critical temperature
493 * if PSP not enable, no Thermal Throttling function will be performed
494 * just set the GP1 bit to acknowledge the event
495 * otherwise, go into IWL_TI_CT_KILL state
496 * since Card State Notification will not provide any temperature reading
497 * for Legacy mode
498 * so just pass the CT_KILL temperature to iwl_legacy_tt_handler()
499 * for advance mode
500 * pass CT_KILL_THRESHOLD+1 to make sure move into IWL_TI_CT_KILL state
501 */
iwl_bg_ct_enter(struct work_struct * work)502 static void iwl_bg_ct_enter(struct work_struct *work)
503 {
504 struct iwl_priv *priv = container_of(work, struct iwl_priv, ct_enter);
505 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
506
507 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
508 return;
509
510 if (!iwl_is_ready(priv))
511 return;
512
513 if (tt->state != IWL_TI_CT_KILL) {
514 IWL_ERR(priv, "Device reached critical temperature "
515 "- ucode going to sleep!\n");
516 if (!priv->thermal_throttle.advanced_tt)
517 iwl_legacy_tt_handler(priv,
518 IWL_MINIMAL_POWER_THRESHOLD,
519 true);
520 else
521 iwl_advance_tt_handler(priv,
522 CT_KILL_THRESHOLD + 1, true);
523 }
524 }
525
526 /* Card State Notification indicated out of critical temperature
527 * since Card State Notification will not provide any temperature reading
528 * so pass the IWL_REDUCED_PERFORMANCE_THRESHOLD_2 temperature
529 * to iwl_legacy_tt_handler() to get out of IWL_CT_KILL state
530 */
iwl_bg_ct_exit(struct work_struct * work)531 static void iwl_bg_ct_exit(struct work_struct *work)
532 {
533 struct iwl_priv *priv = container_of(work, struct iwl_priv, ct_exit);
534 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
535
536 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
537 return;
538
539 if (!iwl_is_ready(priv))
540 return;
541
542 /* stop ct_kill_exit_tm timer */
543 del_timer_sync(&priv->thermal_throttle.ct_kill_exit_tm);
544
545 if (tt->state == IWL_TI_CT_KILL) {
546 IWL_ERR(priv,
547 "Device temperature below critical"
548 "- ucode awake!\n");
549 /*
550 * exit from CT_KILL state
551 * reset the current temperature reading
552 */
553 priv->temperature = 0;
554 if (!priv->thermal_throttle.advanced_tt)
555 iwl_legacy_tt_handler(priv,
556 IWL_REDUCED_PERFORMANCE_THRESHOLD_2,
557 true);
558 else
559 iwl_advance_tt_handler(priv, CT_KILL_EXIT_THRESHOLD,
560 true);
561 }
562 }
563
iwl_tt_enter_ct_kill(struct iwl_priv * priv)564 void iwl_tt_enter_ct_kill(struct iwl_priv *priv)
565 {
566 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
567 return;
568
569 IWL_DEBUG_TEMP(priv, "Queueing critical temperature enter.\n");
570 queue_work(priv->workqueue, &priv->ct_enter);
571 }
572
iwl_tt_exit_ct_kill(struct iwl_priv * priv)573 void iwl_tt_exit_ct_kill(struct iwl_priv *priv)
574 {
575 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
576 return;
577
578 IWL_DEBUG_TEMP(priv, "Queueing critical temperature exit.\n");
579 queue_work(priv->workqueue, &priv->ct_exit);
580 }
581
iwl_bg_tt_work(struct work_struct * work)582 static void iwl_bg_tt_work(struct work_struct *work)
583 {
584 struct iwl_priv *priv = container_of(work, struct iwl_priv, tt_work);
585 s32 temp = priv->temperature; /* degrees CELSIUS except specified */
586
587 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
588 return;
589
590 if (!priv->thermal_throttle.advanced_tt)
591 iwl_legacy_tt_handler(priv, temp, false);
592 else
593 iwl_advance_tt_handler(priv, temp, false);
594 }
595
iwl_tt_handler(struct iwl_priv * priv)596 void iwl_tt_handler(struct iwl_priv *priv)
597 {
598 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
599 return;
600
601 IWL_DEBUG_TEMP(priv, "Queueing thermal throttling work.\n");
602 queue_work(priv->workqueue, &priv->tt_work);
603 }
604
605 /* Thermal throttling initialization
606 * For advance thermal throttling:
607 * Initialize Thermal Index and temperature threshold table
608 * Initialize thermal throttling restriction table
609 */
iwl_tt_initialize(struct iwl_priv * priv)610 void iwl_tt_initialize(struct iwl_priv *priv)
611 {
612 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
613 int size = sizeof(struct iwl_tt_trans) * (IWL_TI_STATE_MAX - 1);
614 struct iwl_tt_trans *transaction;
615
616 IWL_DEBUG_TEMP(priv, "Initialize Thermal Throttling\n");
617
618 memset(tt, 0, sizeof(struct iwl_tt_mgmt));
619
620 tt->state = IWL_TI_0;
621 init_timer(&priv->thermal_throttle.ct_kill_exit_tm);
622 priv->thermal_throttle.ct_kill_exit_tm.data = (unsigned long)priv;
623 priv->thermal_throttle.ct_kill_exit_tm.function =
624 iwl_tt_check_exit_ct_kill;
625 init_timer(&priv->thermal_throttle.ct_kill_waiting_tm);
626 priv->thermal_throttle.ct_kill_waiting_tm.data =
627 (unsigned long)priv;
628 priv->thermal_throttle.ct_kill_waiting_tm.function =
629 iwl_tt_ready_for_ct_kill;
630 /* setup deferred ct kill work */
631 INIT_WORK(&priv->tt_work, iwl_bg_tt_work);
632 INIT_WORK(&priv->ct_enter, iwl_bg_ct_enter);
633 INIT_WORK(&priv->ct_exit, iwl_bg_ct_exit);
634
635 if (cfg(priv)->base_params->adv_thermal_throttle) {
636 IWL_DEBUG_TEMP(priv, "Advanced Thermal Throttling\n");
637 tt->restriction = kcalloc(IWL_TI_STATE_MAX,
638 sizeof(struct iwl_tt_restriction),
639 GFP_KERNEL);
640 tt->transaction = kcalloc(IWL_TI_STATE_MAX *
641 (IWL_TI_STATE_MAX - 1),
642 sizeof(struct iwl_tt_trans),
643 GFP_KERNEL);
644 if (!tt->restriction || !tt->transaction) {
645 IWL_ERR(priv, "Fallback to Legacy Throttling\n");
646 priv->thermal_throttle.advanced_tt = false;
647 kfree(tt->restriction);
648 tt->restriction = NULL;
649 kfree(tt->transaction);
650 tt->transaction = NULL;
651 } else {
652 transaction = tt->transaction +
653 (IWL_TI_0 * (IWL_TI_STATE_MAX - 1));
654 memcpy(transaction, &tt_range_0[0], size);
655 transaction = tt->transaction +
656 (IWL_TI_1 * (IWL_TI_STATE_MAX - 1));
657 memcpy(transaction, &tt_range_1[0], size);
658 transaction = tt->transaction +
659 (IWL_TI_2 * (IWL_TI_STATE_MAX - 1));
660 memcpy(transaction, &tt_range_2[0], size);
661 transaction = tt->transaction +
662 (IWL_TI_CT_KILL * (IWL_TI_STATE_MAX - 1));
663 memcpy(transaction, &tt_range_3[0], size);
664 size = sizeof(struct iwl_tt_restriction) *
665 IWL_TI_STATE_MAX;
666 memcpy(tt->restriction,
667 &restriction_range[0], size);
668 priv->thermal_throttle.advanced_tt = true;
669 }
670 } else {
671 IWL_DEBUG_TEMP(priv, "Legacy Thermal Throttling\n");
672 priv->thermal_throttle.advanced_tt = false;
673 }
674 }
675
676 /* cleanup thermal throttling management related memory and timer */
iwl_tt_exit(struct iwl_priv * priv)677 void iwl_tt_exit(struct iwl_priv *priv)
678 {
679 struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
680
681 /* stop ct_kill_exit_tm timer if activated */
682 del_timer_sync(&priv->thermal_throttle.ct_kill_exit_tm);
683 /* stop ct_kill_waiting_tm timer if activated */
684 del_timer_sync(&priv->thermal_throttle.ct_kill_waiting_tm);
685 cancel_work_sync(&priv->tt_work);
686 cancel_work_sync(&priv->ct_enter);
687 cancel_work_sync(&priv->ct_exit);
688
689 if (priv->thermal_throttle.advanced_tt) {
690 /* free advance thermal throttling memory */
691 kfree(tt->restriction);
692 tt->restriction = NULL;
693 kfree(tt->transaction);
694 tt->transaction = NULL;
695 }
696 }
697