Branch data Line data Source code
1 : : // SPDX-License-Identifier: GPL-2.0-only
2 : : /*
3 : : * Thermal throttle event support code (such as syslog messaging and rate
4 : : * limiting) that was factored out from x86_64 (mce_intel.c) and i386 (p4.c).
5 : : *
6 : : * This allows consistent reporting of CPU thermal throttle events.
7 : : *
8 : : * Maintains a counter in /sys that keeps track of the number of thermal
9 : : * events, such that the user knows how bad the thermal problem might be
10 : : * (since the logging to syslog is rate limited).
11 : : *
12 : : * Author: Dmitriy Zavin (dmitriyz@google.com)
13 : : *
14 : : * Credits: Adapted from Zwane Mwaikambo's original code in mce_intel.c.
15 : : * Inspired by Ross Biro's and Al Borchers' counter code.
16 : : */
17 : : #include <linux/interrupt.h>
18 : : #include <linux/notifier.h>
19 : : #include <linux/jiffies.h>
20 : : #include <linux/kernel.h>
21 : : #include <linux/percpu.h>
22 : : #include <linux/export.h>
23 : : #include <linux/types.h>
24 : : #include <linux/init.h>
25 : : #include <linux/smp.h>
26 : : #include <linux/cpu.h>
27 : :
28 : : #include <asm/processor.h>
29 : : #include <asm/traps.h>
30 : : #include <asm/apic.h>
31 : : #include <asm/mce.h>
32 : : #include <asm/msr.h>
33 : : #include <asm/trace/irq_vectors.h>
34 : :
35 : : #include "internal.h"
36 : :
37 : : /* How long to wait between reporting thermal events */
38 : : #define CHECK_INTERVAL (300 * HZ)
39 : :
40 : : #define THERMAL_THROTTLING_EVENT 0
41 : : #define POWER_LIMIT_EVENT 1
42 : :
43 : : /**
44 : : * struct _thermal_state - Represent the current thermal event state
45 : : * @next_check: Stores the next timestamp, when it is allowed
46 : : * to log the next warning message.
47 : : * @last_interrupt_time: Stores the timestamp for the last threshold
48 : : * high event.
49 : : * @therm_work: Delayed workqueue structure
50 : : * @count: Stores the current running count for thermal
51 : : * or power threshold interrupts.
52 : : * @last_count: Stores the previous running count for thermal
53 : : * or power threshold interrupts.
54 : : * @max_time_ms: This shows the maximum amount of time CPU was
55 : : * in throttled state for a single thermal
56 : : * threshold high to low state.
57 : : * @total_time_ms: This is a cumulative time during which CPU was
58 : : * in the throttled state.
59 : : * @rate_control_active: Set when a throttling message is logged.
60 : : * This is used for the purpose of rate-control.
61 : : * @new_event: Stores the last high/low status of the
62 : : * THERM_STATUS_PROCHOT or
63 : : * THERM_STATUS_POWER_LIMIT.
64 : : * @level: Stores whether this _thermal_state instance is
65 : : * for a CORE level or for PACKAGE level.
66 : : * @sample_index: Index for storing the next sample in the buffer
67 : : * temp_samples[].
68 : : * @sample_count: Total number of samples collected in the buffer
69 : : * temp_samples[].
70 : : * @average: The last moving average of temperature samples
71 : : * @baseline_temp: Temperature at which thermal threshold high
72 : : * interrupt was generated.
73 : : * @temp_samples: Storage for temperature samples to calculate
74 : : * moving average.
75 : : *
76 : : * This structure is used to represent data related to thermal state for a CPU.
77 : : * There is a separate storage for core and package level for each CPU.
78 : : */
79 : : struct _thermal_state {
80 : : u64 next_check;
81 : : u64 last_interrupt_time;
82 : : struct delayed_work therm_work;
83 : : unsigned long count;
84 : : unsigned long last_count;
85 : : unsigned long max_time_ms;
86 : : unsigned long total_time_ms;
87 : : bool rate_control_active;
88 : : bool new_event;
89 : : u8 level;
90 : : u8 sample_index;
91 : : u8 sample_count;
92 : : u8 average;
93 : : u8 baseline_temp;
94 : : u8 temp_samples[3];
95 : : };
96 : :
97 : : struct thermal_state {
98 : : struct _thermal_state core_throttle;
99 : : struct _thermal_state core_power_limit;
100 : : struct _thermal_state package_throttle;
101 : : struct _thermal_state package_power_limit;
102 : : struct _thermal_state core_thresh0;
103 : : struct _thermal_state core_thresh1;
104 : : struct _thermal_state pkg_thresh0;
105 : : struct _thermal_state pkg_thresh1;
106 : : };
107 : :
108 : : /* Callback to handle core threshold interrupts */
109 : : int (*platform_thermal_notify)(__u64 msr_val);
110 : : EXPORT_SYMBOL(platform_thermal_notify);
111 : :
112 : : /* Callback to handle core package threshold_interrupts */
113 : : int (*platform_thermal_package_notify)(__u64 msr_val);
114 : : EXPORT_SYMBOL_GPL(platform_thermal_package_notify);
115 : :
116 : : /* Callback support of rate control, return true, if
117 : : * callback has rate control */
118 : : bool (*platform_thermal_package_rate_control)(void);
119 : : EXPORT_SYMBOL_GPL(platform_thermal_package_rate_control);
120 : :
121 : :
122 : : static DEFINE_PER_CPU(struct thermal_state, thermal_state);
123 : :
124 : : static atomic_t therm_throt_en = ATOMIC_INIT(0);
125 : :
126 : : static u32 lvtthmr_init __read_mostly;
127 : :
128 : : #ifdef CONFIG_SYSFS
129 : : #define define_therm_throt_device_one_ro(_name) \
130 : : static DEVICE_ATTR(_name, 0444, \
131 : : therm_throt_device_show_##_name, \
132 : : NULL) \
133 : :
134 : : #define define_therm_throt_device_show_func(event, name) \
135 : : \
136 : : static ssize_t therm_throt_device_show_##event##_##name( \
137 : : struct device *dev, \
138 : : struct device_attribute *attr, \
139 : : char *buf) \
140 : : { \
141 : : unsigned int cpu = dev->id; \
142 : : ssize_t ret; \
143 : : \
144 : : preempt_disable(); /* CPU hotplug */ \
145 : : if (cpu_online(cpu)) { \
146 : : ret = sprintf(buf, "%lu\n", \
147 : : per_cpu(thermal_state, cpu).event.name); \
148 : : } else \
149 : : ret = 0; \
150 : : preempt_enable(); \
151 : : \
152 : : return ret; \
153 : : }
154 : :
155 [ # # ]: 0 : define_therm_throt_device_show_func(core_throttle, count);
156 : : define_therm_throt_device_one_ro(core_throttle_count);
157 : :
158 [ # # ]: 0 : define_therm_throt_device_show_func(core_power_limit, count);
159 : : define_therm_throt_device_one_ro(core_power_limit_count);
160 : :
161 [ # # ]: 0 : define_therm_throt_device_show_func(package_throttle, count);
162 : : define_therm_throt_device_one_ro(package_throttle_count);
163 : :
164 [ # # ]: 0 : define_therm_throt_device_show_func(package_power_limit, count);
165 : : define_therm_throt_device_one_ro(package_power_limit_count);
166 : :
167 [ # # ]: 0 : define_therm_throt_device_show_func(core_throttle, max_time_ms);
168 : : define_therm_throt_device_one_ro(core_throttle_max_time_ms);
169 : :
170 [ # # ]: 0 : define_therm_throt_device_show_func(package_throttle, max_time_ms);
171 : : define_therm_throt_device_one_ro(package_throttle_max_time_ms);
172 : :
173 [ # # ]: 0 : define_therm_throt_device_show_func(core_throttle, total_time_ms);
174 : : define_therm_throt_device_one_ro(core_throttle_total_time_ms);
175 : :
176 [ # # ]: 0 : define_therm_throt_device_show_func(package_throttle, total_time_ms);
177 : : define_therm_throt_device_one_ro(package_throttle_total_time_ms);
178 : :
179 : : static struct attribute *thermal_throttle_attrs[] = {
180 : : &dev_attr_core_throttle_count.attr,
181 : : &dev_attr_core_throttle_max_time_ms.attr,
182 : : &dev_attr_core_throttle_total_time_ms.attr,
183 : : NULL
184 : : };
185 : :
186 : : static const struct attribute_group thermal_attr_group = {
187 : : .attrs = thermal_throttle_attrs,
188 : : .name = "thermal_throttle"
189 : : };
190 : : #endif /* CONFIG_SYSFS */
191 : :
192 : : #define CORE_LEVEL 0
193 : : #define PACKAGE_LEVEL 1
194 : :
195 : : #define THERM_THROT_POLL_INTERVAL HZ
196 : : #define THERM_STATUS_PROCHOT_LOG BIT(1)
197 : :
198 : : #define THERM_STATUS_CLEAR_CORE_MASK (BIT(1) | BIT(3) | BIT(5) | BIT(7) | BIT(9) | BIT(11) | BIT(13) | BIT(15))
199 : : #define THERM_STATUS_CLEAR_PKG_MASK (BIT(1) | BIT(3) | BIT(5) | BIT(7) | BIT(9) | BIT(11))
200 : :
201 : 0 : static void clear_therm_status_log(int level)
202 : : {
203 : 0 : int msr;
204 : 0 : u64 mask, msr_val;
205 : :
206 [ # # ]: 0 : if (level == CORE_LEVEL) {
207 : : msr = MSR_IA32_THERM_STATUS;
208 : : mask = THERM_STATUS_CLEAR_CORE_MASK;
209 : : } else {
210 : 0 : msr = MSR_IA32_PACKAGE_THERM_STATUS;
211 : 0 : mask = THERM_STATUS_CLEAR_PKG_MASK;
212 : : }
213 : :
214 : 0 : rdmsrl(msr, msr_val);
215 : 0 : msr_val &= mask;
216 : 0 : wrmsrl(msr, msr_val & ~THERM_STATUS_PROCHOT_LOG);
217 : 0 : }
218 : :
219 : 0 : static void get_therm_status(int level, bool *proc_hot, u8 *temp)
220 : : {
221 : 0 : int msr;
222 : 0 : u64 msr_val;
223 : :
224 [ # # ]: 0 : if (level == CORE_LEVEL)
225 : : msr = MSR_IA32_THERM_STATUS;
226 : : else
227 : 0 : msr = MSR_IA32_PACKAGE_THERM_STATUS;
228 : :
229 : 0 : rdmsrl(msr, msr_val);
230 [ # # ]: 0 : if (msr_val & THERM_STATUS_PROCHOT_LOG)
231 : 0 : *proc_hot = true;
232 : : else
233 : 0 : *proc_hot = false;
234 : :
235 : 0 : *temp = (msr_val >> 16) & 0x7F;
236 : 0 : }
237 : :
238 : 0 : static void __maybe_unused throttle_active_work(struct work_struct *work)
239 : : {
240 : 0 : struct _thermal_state *state = container_of(to_delayed_work(work),
241 : : struct _thermal_state, therm_work);
242 : 0 : unsigned int i, avg, this_cpu = smp_processor_id();
243 : 0 : u64 now = get_jiffies_64();
244 : 0 : bool hot;
245 : 0 : u8 temp;
246 : :
247 : 0 : get_therm_status(state->level, &hot, &temp);
248 : : /* temperature value is offset from the max so lesser means hotter */
249 [ # # # # ]: 0 : if (!hot && temp > state->baseline_temp) {
250 [ # # ]: 0 : if (state->rate_control_active)
251 [ # # ]: 0 : pr_info("CPU%d: %s temperature/speed normal (total events = %lu)\n",
252 : : this_cpu,
253 : : state->level == CORE_LEVEL ? "Core" : "Package",
254 : : state->count);
255 : :
256 : 0 : state->rate_control_active = false;
257 : 0 : return;
258 : : }
259 : :
260 [ # # ]: 0 : if (time_before64(now, state->next_check) &&
261 [ # # ]: 0 : state->rate_control_active)
262 : 0 : goto re_arm;
263 : :
264 : 0 : state->next_check = now + CHECK_INTERVAL;
265 : :
266 [ # # ]: 0 : if (state->count != state->last_count) {
267 : : /* There was one new thermal interrupt */
268 : 0 : state->last_count = state->count;
269 : 0 : state->average = 0;
270 : 0 : state->sample_count = 0;
271 : 0 : state->sample_index = 0;
272 : : }
273 : :
274 : 0 : state->temp_samples[state->sample_index] = temp;
275 : 0 : state->sample_count++;
276 : 0 : state->sample_index = (state->sample_index + 1) % ARRAY_SIZE(state->temp_samples);
277 [ # # ]: 0 : if (state->sample_count < ARRAY_SIZE(state->temp_samples))
278 : 0 : goto re_arm;
279 : :
280 : : avg = 0;
281 [ # # ]: 0 : for (i = 0; i < ARRAY_SIZE(state->temp_samples); ++i)
282 : 0 : avg += state->temp_samples[i];
283 : :
284 : 0 : avg /= ARRAY_SIZE(state->temp_samples);
285 : :
286 [ # # ]: 0 : if (state->average > avg) {
287 [ # # ]: 0 : pr_warn("CPU%d: %s temperature is above threshold, cpu clock is throttled (total events = %lu)\n",
288 : : this_cpu,
289 : : state->level == CORE_LEVEL ? "Core" : "Package",
290 : : state->count);
291 : 0 : state->rate_control_active = true;
292 : : }
293 : :
294 : 0 : state->average = avg;
295 : :
296 : 0 : re_arm:
297 : 0 : clear_therm_status_log(state->level);
298 : 0 : schedule_delayed_work_on(this_cpu, &state->therm_work, THERM_THROT_POLL_INTERVAL);
299 : : }
300 : :
301 : : /***
302 : : * therm_throt_process - Process thermal throttling event from interrupt
303 : : * @curr: Whether the condition is current or not (boolean), since the
304 : : * thermal interrupt normally gets called both when the thermal
305 : : * event begins and once the event has ended.
306 : : *
307 : : * This function is called by the thermal interrupt after the
308 : : * IRQ has been acknowledged.
309 : : *
310 : : * It will take care of rate limiting and printing messages to the syslog.
311 : : */
312 : 0 : static void therm_throt_process(bool new_event, int event, int level)
313 : : {
314 : 0 : struct _thermal_state *state;
315 [ # # ]: 0 : unsigned int this_cpu = smp_processor_id();
316 : 0 : bool old_event;
317 : 0 : u64 now;
318 : 0 : struct thermal_state *pstate = &per_cpu(thermal_state, this_cpu);
319 : :
320 [ # # ]: 0 : now = get_jiffies_64();
321 [ # # ]: 0 : if (level == CORE_LEVEL) {
322 [ # # ]: 0 : if (event == THERMAL_THROTTLING_EVENT)
323 : 0 : state = &pstate->core_throttle;
324 [ # # ]: 0 : else if (event == POWER_LIMIT_EVENT)
325 : 0 : state = &pstate->core_power_limit;
326 : : else
327 : : return;
328 [ # # ]: 0 : } else if (level == PACKAGE_LEVEL) {
329 [ # # ]: 0 : if (event == THERMAL_THROTTLING_EVENT)
330 : 0 : state = &pstate->package_throttle;
331 [ # # ]: 0 : else if (event == POWER_LIMIT_EVENT)
332 : 0 : state = &pstate->package_power_limit;
333 : : else
334 : : return;
335 : : } else
336 : : return;
337 : :
338 : 0 : old_event = state->new_event;
339 : 0 : state->new_event = new_event;
340 : :
341 [ # # ]: 0 : if (new_event)
342 : 0 : state->count++;
343 : :
344 [ # # ]: 0 : if (event != THERMAL_THROTTLING_EVENT)
345 : : return;
346 : :
347 [ # # # # ]: 0 : if (new_event && !state->last_interrupt_time) {
348 : 0 : bool hot;
349 : 0 : u8 temp;
350 : :
351 : 0 : get_therm_status(state->level, &hot, &temp);
352 : : /*
353 : : * Ignore short temperature spike as the system is not close
354 : : * to PROCHOT. 10C offset is large enough to ignore. It is
355 : : * already dropped from the high threshold temperature.
356 : : */
357 [ # # ]: 0 : if (temp > 10)
358 : 0 : return;
359 : :
360 : 0 : state->baseline_temp = temp;
361 : 0 : state->last_interrupt_time = now;
362 : 0 : schedule_delayed_work_on(this_cpu, &state->therm_work, THERM_THROT_POLL_INTERVAL);
363 [ # # # # ]: 0 : } else if (old_event && state->last_interrupt_time) {
364 : 0 : unsigned long throttle_time;
365 : :
366 : 0 : throttle_time = jiffies_delta_to_msecs(now - state->last_interrupt_time);
367 [ # # ]: 0 : if (throttle_time > state->max_time_ms)
368 : 0 : state->max_time_ms = throttle_time;
369 : 0 : state->total_time_ms += throttle_time;
370 : 0 : state->last_interrupt_time = 0;
371 : : }
372 : : }
373 : :
374 : 0 : static int thresh_event_valid(int level, int event)
375 : : {
376 : 0 : struct _thermal_state *state;
377 [ # # # # : 0 : unsigned int this_cpu = smp_processor_id();
# # # # ]
378 : 0 : struct thermal_state *pstate = &per_cpu(thermal_state, this_cpu);
379 [ # # # # : 0 : u64 now = get_jiffies_64();
# # # # ]
380 : :
381 : 0 : if (level == PACKAGE_LEVEL)
382 : 0 : state = (event == 0) ? &pstate->pkg_thresh0 :
383 : : &pstate->pkg_thresh1;
384 : : else
385 : 0 : state = (event == 0) ? &pstate->core_thresh0 :
386 : : &pstate->core_thresh1;
387 : :
388 [ # # # # : 0 : if (time_before64(now, state->next_check))
# # # # ]
389 : : return 0;
390 : :
391 : 0 : state->next_check = now + CHECK_INTERVAL;
392 : :
393 : 0 : return 1;
394 : : }
395 : :
396 : : static bool int_pln_enable;
397 : 0 : static int __init int_pln_enable_setup(char *s)
398 : : {
399 : 0 : int_pln_enable = true;
400 : :
401 : 0 : return 1;
402 : : }
403 : : __setup("int_pln_enable", int_pln_enable_setup);
404 : :
405 : : #ifdef CONFIG_SYSFS
406 : : /* Add/Remove thermal_throttle interface for CPU device: */
407 : 0 : static int thermal_throttle_add_dev(struct device *dev, unsigned int cpu)
408 : : {
409 : 0 : int err;
410 : 0 : struct cpuinfo_x86 *c = &cpu_data(cpu);
411 : :
412 : 0 : err = sysfs_create_group(&dev->kobj, &thermal_attr_group);
413 [ # # ]: 0 : if (err)
414 : : return err;
415 : :
416 [ # # # # ]: 0 : if (cpu_has(c, X86_FEATURE_PLN) && int_pln_enable) {
417 : 0 : err = sysfs_add_file_to_group(&dev->kobj,
418 : : &dev_attr_core_power_limit_count.attr,
419 : : thermal_attr_group.name);
420 [ # # ]: 0 : if (err)
421 : 0 : goto del_group;
422 : : }
423 : :
424 [ # # ]: 0 : if (cpu_has(c, X86_FEATURE_PTS)) {
425 : 0 : err = sysfs_add_file_to_group(&dev->kobj,
426 : : &dev_attr_package_throttle_count.attr,
427 : : thermal_attr_group.name);
428 [ # # ]: 0 : if (err)
429 : 0 : goto del_group;
430 : :
431 : 0 : err = sysfs_add_file_to_group(&dev->kobj,
432 : : &dev_attr_package_throttle_max_time_ms.attr,
433 : : thermal_attr_group.name);
434 [ # # ]: 0 : if (err)
435 : 0 : goto del_group;
436 : :
437 : 0 : err = sysfs_add_file_to_group(&dev->kobj,
438 : : &dev_attr_package_throttle_total_time_ms.attr,
439 : : thermal_attr_group.name);
440 [ # # ]: 0 : if (err)
441 : 0 : goto del_group;
442 : :
443 [ # # # # ]: 0 : if (cpu_has(c, X86_FEATURE_PLN) && int_pln_enable) {
444 : 0 : err = sysfs_add_file_to_group(&dev->kobj,
445 : : &dev_attr_package_power_limit_count.attr,
446 : : thermal_attr_group.name);
447 [ # # ]: 0 : if (err)
448 : 0 : goto del_group;
449 : : }
450 : : }
451 : :
452 : : return 0;
453 : :
454 : 0 : del_group:
455 : 0 : sysfs_remove_group(&dev->kobj, &thermal_attr_group);
456 : :
457 : 0 : return err;
458 : : }
459 : :
460 : 0 : static void thermal_throttle_remove_dev(struct device *dev)
461 : : {
462 : 0 : sysfs_remove_group(&dev->kobj, &thermal_attr_group);
463 : : }
464 : :
465 : : /* Get notified when a cpu comes on/off. Be hotplug friendly. */
466 : 0 : static int thermal_throttle_online(unsigned int cpu)
467 : : {
468 : 0 : struct thermal_state *state = &per_cpu(thermal_state, cpu);
469 : 0 : struct device *dev = get_cpu_device(cpu);
470 : 0 : u32 l;
471 : :
472 : 0 : state->package_throttle.level = PACKAGE_LEVEL;
473 : 0 : state->core_throttle.level = CORE_LEVEL;
474 : :
475 : 0 : INIT_DELAYED_WORK(&state->package_throttle.therm_work, throttle_active_work);
476 : 0 : INIT_DELAYED_WORK(&state->core_throttle.therm_work, throttle_active_work);
477 : :
478 : : /* Unmask the thermal vector after the above workqueues are initialized. */
479 : 0 : l = apic_read(APIC_LVTTHMR);
480 : 0 : apic_write(APIC_LVTTHMR, l & ~APIC_LVT_MASKED);
481 : :
482 : 0 : return thermal_throttle_add_dev(dev, cpu);
483 : : }
484 : :
485 : 0 : static int thermal_throttle_offline(unsigned int cpu)
486 : : {
487 : 0 : struct thermal_state *state = &per_cpu(thermal_state, cpu);
488 : 0 : struct device *dev = get_cpu_device(cpu);
489 : 0 : u32 l;
490 : :
491 : : /* Mask the thermal vector before draining evtl. pending work */
492 : 0 : l = apic_read(APIC_LVTTHMR);
493 : 0 : apic_write(APIC_LVTTHMR, l | APIC_LVT_MASKED);
494 : :
495 : 0 : cancel_delayed_work_sync(&state->package_throttle.therm_work);
496 : 0 : cancel_delayed_work_sync(&state->core_throttle.therm_work);
497 : :
498 : 0 : state->package_throttle.rate_control_active = false;
499 : 0 : state->core_throttle.rate_control_active = false;
500 : :
501 : 0 : thermal_throttle_remove_dev(dev);
502 : 0 : return 0;
503 : : }
504 : :
505 : 78 : static __init int thermal_throttle_init_device(void)
506 : : {
507 : 78 : int ret;
508 : :
509 [ - + ]: 78 : if (!atomic_read(&therm_throt_en))
510 : : return 0;
511 : :
512 : 0 : ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/therm:online",
513 : : thermal_throttle_online,
514 : : thermal_throttle_offline);
515 : 0 : return ret < 0 ? ret : 0;
516 : : }
517 : : device_initcall(thermal_throttle_init_device);
518 : :
519 : : #endif /* CONFIG_SYSFS */
520 : :
521 : 0 : static void notify_package_thresholds(__u64 msr_val)
522 : : {
523 : 0 : bool notify_thres_0 = false;
524 : 0 : bool notify_thres_1 = false;
525 : :
526 [ # # ]: 0 : if (!platform_thermal_package_notify)
527 : : return;
528 : :
529 : : /* lower threshold check */
530 [ # # ]: 0 : if (msr_val & THERM_LOG_THRESHOLD0)
531 : 0 : notify_thres_0 = true;
532 : : /* higher threshold check */
533 [ # # ]: 0 : if (msr_val & THERM_LOG_THRESHOLD1)
534 : 0 : notify_thres_1 = true;
535 : :
536 [ # # ]: 0 : if (!notify_thres_0 && !notify_thres_1)
537 : : return;
538 : :
539 [ # # # # ]: 0 : if (platform_thermal_package_rate_control &&
540 : 0 : platform_thermal_package_rate_control()) {
541 : : /* Rate control is implemented in callback */
542 : 0 : platform_thermal_package_notify(msr_val);
543 : 0 : return;
544 : : }
545 : :
546 : : /* lower threshold reached */
547 [ # # ]: 0 : if (notify_thres_0 && thresh_event_valid(PACKAGE_LEVEL, 0))
548 : 0 : platform_thermal_package_notify(msr_val);
549 : : /* higher threshold reached */
550 [ # # ]: 0 : if (notify_thres_1 && thresh_event_valid(PACKAGE_LEVEL, 1))
551 : 0 : platform_thermal_package_notify(msr_val);
552 : : }
553 : :
554 : 0 : static void notify_thresholds(__u64 msr_val)
555 : : {
556 : : /* check whether the interrupt handler is defined;
557 : : * otherwise simply return
558 : : */
559 [ # # ]: 0 : if (!platform_thermal_notify)
560 : : return;
561 : :
562 : : /* lower threshold reached */
563 [ # # ]: 0 : if ((msr_val & THERM_LOG_THRESHOLD0) &&
564 : : thresh_event_valid(CORE_LEVEL, 0))
565 : 0 : platform_thermal_notify(msr_val);
566 : : /* higher threshold reached */
567 [ # # ]: 0 : if ((msr_val & THERM_LOG_THRESHOLD1) &&
568 : : thresh_event_valid(CORE_LEVEL, 1))
569 : 0 : platform_thermal_notify(msr_val);
570 : : }
571 : :
572 : : /* Thermal transition interrupt handler */
573 : 0 : static void intel_thermal_interrupt(void)
574 : : {
575 : 0 : __u64 msr_val;
576 : :
577 [ # # # ]: 0 : if (static_cpu_has(X86_FEATURE_HWP))
578 : 0 : wrmsrl_safe(MSR_HWP_STATUS, 0);
579 : :
580 : 0 : rdmsrl(MSR_IA32_THERM_STATUS, msr_val);
581 : :
582 : : /* Check for violation of core thermal thresholds*/
583 : 0 : notify_thresholds(msr_val);
584 : :
585 : 0 : therm_throt_process(msr_val & THERM_STATUS_PROCHOT,
586 : : THERMAL_THROTTLING_EVENT,
587 : : CORE_LEVEL);
588 : :
589 [ # # # # ]: 0 : if (this_cpu_has(X86_FEATURE_PLN) && int_pln_enable)
590 : 0 : therm_throt_process(msr_val & THERM_STATUS_POWER_LIMIT,
591 : : POWER_LIMIT_EVENT,
592 : : CORE_LEVEL);
593 : :
594 [ # # ]: 0 : if (this_cpu_has(X86_FEATURE_PTS)) {
595 : 0 : rdmsrl(MSR_IA32_PACKAGE_THERM_STATUS, msr_val);
596 : : /* check violations of package thermal thresholds */
597 : 0 : notify_package_thresholds(msr_val);
598 : 0 : therm_throt_process(msr_val & PACKAGE_THERM_STATUS_PROCHOT,
599 : : THERMAL_THROTTLING_EVENT,
600 : : PACKAGE_LEVEL);
601 [ # # # # ]: 0 : if (this_cpu_has(X86_FEATURE_PLN) && int_pln_enable)
602 : 0 : therm_throt_process(msr_val &
603 : : PACKAGE_THERM_STATUS_POWER_LIMIT,
604 : : POWER_LIMIT_EVENT,
605 : : PACKAGE_LEVEL);
606 : : }
607 : 0 : }
608 : :
609 : 0 : static void unexpected_thermal_interrupt(void)
610 : : {
611 : 0 : pr_err("CPU%d: Unexpected LVT thermal interrupt!\n",
612 : : smp_processor_id());
613 : 0 : }
614 : :
615 : : static void (*smp_thermal_vector)(void) = unexpected_thermal_interrupt;
616 : :
617 : 0 : asmlinkage __visible void __irq_entry smp_thermal_interrupt(struct pt_regs *regs)
618 : : {
619 : 0 : entering_irq();
620 : 0 : trace_thermal_apic_entry(THERMAL_APIC_VECTOR);
621 : 0 : inc_irq_stat(irq_thermal_count);
622 : 0 : smp_thermal_vector();
623 : 0 : trace_thermal_apic_exit(THERMAL_APIC_VECTOR);
624 : 0 : exiting_ack_irq();
625 : 0 : }
626 : :
627 : : /* Thermal monitoring depends on APIC, ACPI and clock modulation */
628 : 78 : static int intel_thermal_supported(struct cpuinfo_x86 *c)
629 : : {
630 [ + - ]: 78 : if (!boot_cpu_has(X86_FEATURE_APIC))
631 : : return 0;
632 [ - + - - ]: 78 : if (!cpu_has(c, X86_FEATURE_ACPI) || !cpu_has(c, X86_FEATURE_ACC))
633 : 78 : return 0;
634 : : return 1;
635 : : }
636 : :
637 : 78 : void __init mcheck_intel_therm_init(void)
638 : : {
639 : : /*
640 : : * This function is only called on boot CPU. Save the init thermal
641 : : * LVT value on BSP and use that value to restore APs' thermal LVT
642 : : * entry BIOS programmed later
643 : : */
644 [ - + ]: 78 : if (intel_thermal_supported(&boot_cpu_data))
645 : 0 : lvtthmr_init = apic_read(APIC_LVTTHMR);
646 : 78 : }
647 : :
648 : 0 : void intel_init_thermal(struct cpuinfo_x86 *c)
649 : : {
650 : 0 : unsigned int cpu = smp_processor_id();
651 : 0 : int tm2 = 0;
652 : 0 : u32 l, h;
653 : :
654 [ # # ]: 0 : if (!intel_thermal_supported(c))
655 : : return;
656 : :
657 : : /*
658 : : * First check if its enabled already, in which case there might
659 : : * be some SMM goo which handles it, so we can't even put a handler
660 : : * since it might be delivered via SMI already:
661 : : */
662 : 0 : rdmsr(MSR_IA32_MISC_ENABLE, l, h);
663 : :
664 : 0 : h = lvtthmr_init;
665 : : /*
666 : : * The initial value of thermal LVT entries on all APs always reads
667 : : * 0x10000 because APs are woken up by BSP issuing INIT-SIPI-SIPI
668 : : * sequence to them and LVT registers are reset to 0s except for
669 : : * the mask bits which are set to 1s when APs receive INIT IPI.
670 : : * If BIOS takes over the thermal interrupt and sets its interrupt
671 : : * delivery mode to SMI (not fixed), it restores the value that the
672 : : * BIOS has programmed on AP based on BSP's info we saved since BIOS
673 : : * is always setting the same value for all threads/cores.
674 : : */
675 [ # # ]: 0 : if ((h & APIC_DM_FIXED_MASK) != APIC_DM_FIXED)
676 : 0 : apic_write(APIC_LVTTHMR, lvtthmr_init);
677 : :
678 : :
679 [ # # # # ]: 0 : if ((l & MSR_IA32_MISC_ENABLE_TM1) && (h & APIC_DM_SMI)) {
680 : : if (system_state == SYSTEM_BOOTING)
681 : : pr_debug("CPU%d: Thermal monitoring handled by SMI\n", cpu);
682 : : return;
683 : : }
684 : :
685 : : /* early Pentium M models use different method for enabling TM2 */
686 [ # # ]: 0 : if (cpu_has(c, X86_FEATURE_TM2)) {
687 [ # # # # ]: 0 : if (c->x86 == 6 && (c->x86_model == 9 || c->x86_model == 13)) {
688 : 0 : rdmsr(MSR_THERM2_CTL, l, h);
689 [ # # ]: 0 : if (l & MSR_THERM2_CTL_TM_SELECT)
690 : 0 : tm2 = 1;
691 [ # # ]: 0 : } else if (l & MSR_IA32_MISC_ENABLE_TM2)
692 : 0 : tm2 = 1;
693 : : }
694 : :
695 : : /* We'll mask the thermal vector in the lapic till we're ready: */
696 : 0 : h = THERMAL_APIC_VECTOR | APIC_DM_FIXED | APIC_LVT_MASKED;
697 : 0 : apic_write(APIC_LVTTHMR, h);
698 : :
699 : 0 : rdmsr(MSR_IA32_THERM_INTERRUPT, l, h);
700 [ # # # # ]: 0 : if (cpu_has(c, X86_FEATURE_PLN) && !int_pln_enable)
701 : 0 : wrmsr(MSR_IA32_THERM_INTERRUPT,
702 : : (l | (THERM_INT_LOW_ENABLE
703 : 0 : | THERM_INT_HIGH_ENABLE)) & ~THERM_INT_PLN_ENABLE, h);
704 [ # # # # ]: 0 : else if (cpu_has(c, X86_FEATURE_PLN) && int_pln_enable)
705 : 0 : wrmsr(MSR_IA32_THERM_INTERRUPT,
706 : : l | (THERM_INT_LOW_ENABLE
707 : : | THERM_INT_HIGH_ENABLE | THERM_INT_PLN_ENABLE), h);
708 : : else
709 : 0 : wrmsr(MSR_IA32_THERM_INTERRUPT,
710 : : l | (THERM_INT_LOW_ENABLE | THERM_INT_HIGH_ENABLE), h);
711 : :
712 [ # # ]: 0 : if (cpu_has(c, X86_FEATURE_PTS)) {
713 : 0 : rdmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h);
714 [ # # # # ]: 0 : if (cpu_has(c, X86_FEATURE_PLN) && !int_pln_enable)
715 : 0 : wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT,
716 : : (l | (PACKAGE_THERM_INT_LOW_ENABLE
717 : : | PACKAGE_THERM_INT_HIGH_ENABLE))
718 : 0 : & ~PACKAGE_THERM_INT_PLN_ENABLE, h);
719 [ # # # # ]: 0 : else if (cpu_has(c, X86_FEATURE_PLN) && int_pln_enable)
720 : 0 : wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT,
721 : : l | (PACKAGE_THERM_INT_LOW_ENABLE
722 : : | PACKAGE_THERM_INT_HIGH_ENABLE
723 : : | PACKAGE_THERM_INT_PLN_ENABLE), h);
724 : : else
725 : 0 : wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT,
726 : : l | (PACKAGE_THERM_INT_LOW_ENABLE
727 : : | PACKAGE_THERM_INT_HIGH_ENABLE), h);
728 : : }
729 : :
730 : 0 : smp_thermal_vector = intel_thermal_interrupt;
731 : :
732 : 0 : rdmsr(MSR_IA32_MISC_ENABLE, l, h);
733 : 0 : wrmsr(MSR_IA32_MISC_ENABLE, l | MSR_IA32_MISC_ENABLE_TM1, h);
734 : :
735 [ # # # # ]: 0 : pr_info_once("CPU0: Thermal monitoring enabled (%s)\n",
736 : : tm2 ? "TM2" : "TM1");
737 : :
738 : : /* enable thermal throttle processing */
739 : 0 : atomic_set(&therm_throt_en, 1);
740 : : }
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