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1 | /* | |
2 | * x86_pkg_temp_thermal driver | |
3 | * Copyright (c) 2013, Intel Corporation. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc. | |
16 | * | |
17 | */ | |
18 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/err.h> | |
23 | #include <linux/param.h> | |
24 | #include <linux/device.h> | |
25 | #include <linux/platform_device.h> | |
26 | #include <linux/cpu.h> | |
27 | #include <linux/smp.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/pm.h> | |
30 | #include <linux/thermal.h> | |
31 | #include <linux/debugfs.h> | |
32 | #include <asm/cpu_device_id.h> | |
33 | #include <asm/mce.h> | |
34 | ||
35 | /* | |
36 | * Rate control delay: Idea is to introduce denounce effect | |
37 | * This should be long enough to avoid reduce events, when | |
38 | * threshold is set to a temperature, which is constantly | |
39 | * violated, but at the short enough to take any action. | |
40 | * The action can be remove threshold or change it to next | |
41 | * interesting setting. Based on experiments, in around | |
42 | * every 5 seconds under load will give us a significant | |
43 | * temperature change. | |
44 | */ | |
45 | #define PKG_TEMP_THERMAL_NOTIFY_DELAY 5000 | |
46 | static int notify_delay_ms = PKG_TEMP_THERMAL_NOTIFY_DELAY; | |
47 | module_param(notify_delay_ms, int, 0644); | |
48 | MODULE_PARM_DESC(notify_delay_ms, | |
49 | "User space notification delay in milli seconds."); | |
50 | ||
51 | /* Number of trip points in thermal zone. Currently it can't | |
52 | * be more than 2. MSR can allow setting and getting notifications | |
53 | * for only 2 thresholds. This define enforces this, if there | |
54 | * is some wrong values returned by cpuid for number of thresholds. | |
55 | */ | |
56 | #define MAX_NUMBER_OF_TRIPS 2 | |
57 | ||
58 | struct pkg_device { | |
59 | int cpu; | |
60 | bool work_scheduled; | |
61 | u32 tj_max; | |
62 | u32 msr_pkg_therm_low; | |
63 | u32 msr_pkg_therm_high; | |
64 | struct delayed_work work; | |
65 | struct thermal_zone_device *tzone; | |
66 | struct cpumask cpumask; | |
67 | }; | |
68 | ||
69 | static struct thermal_zone_params pkg_temp_tz_params = { | |
70 | .no_hwmon = true, | |
71 | }; | |
72 | ||
73 | /* Keep track of how many package pointers we allocated in init() */ | |
74 | static int max_packages __read_mostly; | |
75 | /* Array of package pointers */ | |
76 | static struct pkg_device **packages; | |
77 | /* Serializes interrupt notification, work and hotplug */ | |
78 | static DEFINE_SPINLOCK(pkg_temp_lock); | |
79 | /* Protects zone operation in the work function against hotplug removal */ | |
80 | static DEFINE_MUTEX(thermal_zone_mutex); | |
81 | ||
82 | /* The dynamically assigned cpu hotplug state for module_exit() */ | |
83 | static enum cpuhp_state pkg_thermal_hp_state __read_mostly; | |
84 | ||
85 | /* Debug counters to show using debugfs */ | |
86 | static struct dentry *debugfs; | |
87 | static unsigned int pkg_interrupt_cnt; | |
88 | static unsigned int pkg_work_cnt; | |
89 | ||
90 | static int pkg_temp_debugfs_init(void) | |
91 | { | |
92 | struct dentry *d; | |
93 | ||
94 | debugfs = debugfs_create_dir("pkg_temp_thermal", NULL); | |
95 | if (!debugfs) | |
96 | return -ENOENT; | |
97 | ||
98 | d = debugfs_create_u32("pkg_thres_interrupt", S_IRUGO, debugfs, | |
99 | (u32 *)&pkg_interrupt_cnt); | |
100 | if (!d) | |
101 | goto err_out; | |
102 | ||
103 | d = debugfs_create_u32("pkg_thres_work", S_IRUGO, debugfs, | |
104 | (u32 *)&pkg_work_cnt); | |
105 | if (!d) | |
106 | goto err_out; | |
107 | ||
108 | return 0; | |
109 | ||
110 | err_out: | |
111 | debugfs_remove_recursive(debugfs); | |
112 | return -ENOENT; | |
113 | } | |
114 | ||
115 | /* | |
116 | * Protection: | |
117 | * | |
118 | * - cpu hotplug: Read serialized by cpu hotplug lock | |
119 | * Write must hold pkg_temp_lock | |
120 | * | |
121 | * - Other callsites: Must hold pkg_temp_lock | |
122 | */ | |
123 | static struct pkg_device *pkg_temp_thermal_get_dev(unsigned int cpu) | |
124 | { | |
125 | int pkgid = topology_logical_package_id(cpu); | |
126 | ||
127 | if (pkgid >= 0 && pkgid < max_packages) | |
128 | return packages[pkgid]; | |
129 | return NULL; | |
130 | } | |
131 | ||
132 | /* | |
133 | * tj-max is is interesting because threshold is set relative to this | |
134 | * temperature. | |
135 | */ | |
136 | static int get_tj_max(int cpu, u32 *tj_max) | |
137 | { | |
138 | u32 eax, edx, val; | |
139 | int err; | |
140 | ||
141 | err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx); | |
142 | if (err) | |
143 | return err; | |
144 | ||
145 | val = (eax >> 16) & 0xff; | |
146 | *tj_max = val * 1000; | |
147 | ||
148 | return val ? 0 : -EINVAL; | |
149 | } | |
150 | ||
151 | static int sys_get_curr_temp(struct thermal_zone_device *tzd, int *temp) | |
152 | { | |
153 | struct pkg_device *pkgdev = tzd->devdata; | |
154 | u32 eax, edx; | |
155 | ||
156 | rdmsr_on_cpu(pkgdev->cpu, MSR_IA32_PACKAGE_THERM_STATUS, &eax, &edx); | |
157 | if (eax & 0x80000000) { | |
158 | *temp = pkgdev->tj_max - ((eax >> 16) & 0x7f) * 1000; | |
159 | pr_debug("sys_get_curr_temp %d\n", *temp); | |
160 | return 0; | |
161 | } | |
162 | return -EINVAL; | |
163 | } | |
164 | ||
165 | static int sys_get_trip_temp(struct thermal_zone_device *tzd, | |
166 | int trip, int *temp) | |
167 | { | |
168 | struct pkg_device *pkgdev = tzd->devdata; | |
169 | unsigned long thres_reg_value; | |
170 | u32 mask, shift, eax, edx; | |
171 | int ret; | |
172 | ||
173 | if (trip >= MAX_NUMBER_OF_TRIPS) | |
174 | return -EINVAL; | |
175 | ||
176 | if (trip) { | |
177 | mask = THERM_MASK_THRESHOLD1; | |
178 | shift = THERM_SHIFT_THRESHOLD1; | |
179 | } else { | |
180 | mask = THERM_MASK_THRESHOLD0; | |
181 | shift = THERM_SHIFT_THRESHOLD0; | |
182 | } | |
183 | ||
184 | ret = rdmsr_on_cpu(pkgdev->cpu, MSR_IA32_PACKAGE_THERM_INTERRUPT, | |
185 | &eax, &edx); | |
186 | if (ret < 0) | |
187 | return ret; | |
188 | ||
189 | thres_reg_value = (eax & mask) >> shift; | |
190 | if (thres_reg_value) | |
191 | *temp = pkgdev->tj_max - thres_reg_value * 1000; | |
192 | else | |
193 | *temp = 0; | |
194 | pr_debug("sys_get_trip_temp %d\n", *temp); | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
199 | static int | |
200 | sys_set_trip_temp(struct thermal_zone_device *tzd, int trip, int temp) | |
201 | { | |
202 | struct pkg_device *pkgdev = tzd->devdata; | |
203 | u32 l, h, mask, shift, intr; | |
204 | int ret; | |
205 | ||
206 | if (trip >= MAX_NUMBER_OF_TRIPS || temp >= pkgdev->tj_max) | |
207 | return -EINVAL; | |
208 | ||
209 | ret = rdmsr_on_cpu(pkgdev->cpu, MSR_IA32_PACKAGE_THERM_INTERRUPT, | |
210 | &l, &h); | |
211 | if (ret < 0) | |
212 | return ret; | |
213 | ||
214 | if (trip) { | |
215 | mask = THERM_MASK_THRESHOLD1; | |
216 | shift = THERM_SHIFT_THRESHOLD1; | |
217 | intr = THERM_INT_THRESHOLD1_ENABLE; | |
218 | } else { | |
219 | mask = THERM_MASK_THRESHOLD0; | |
220 | shift = THERM_SHIFT_THRESHOLD0; | |
221 | intr = THERM_INT_THRESHOLD0_ENABLE; | |
222 | } | |
223 | l &= ~mask; | |
224 | /* | |
225 | * When users space sets a trip temperature == 0, which is indication | |
226 | * that, it is no longer interested in receiving notifications. | |
227 | */ | |
228 | if (!temp) { | |
229 | l &= ~intr; | |
230 | } else { | |
231 | l |= (pkgdev->tj_max - temp)/1000 << shift; | |
232 | l |= intr; | |
233 | } | |
234 | ||
235 | return wrmsr_on_cpu(pkgdev->cpu, MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h); | |
236 | } | |
237 | ||
238 | static int sys_get_trip_type(struct thermal_zone_device *thermal, int trip, | |
239 | enum thermal_trip_type *type) | |
240 | { | |
241 | *type = THERMAL_TRIP_PASSIVE; | |
242 | return 0; | |
243 | } | |
244 | ||
245 | /* Thermal zone callback registry */ | |
246 | static struct thermal_zone_device_ops tzone_ops = { | |
247 | .get_temp = sys_get_curr_temp, | |
248 | .get_trip_temp = sys_get_trip_temp, | |
249 | .get_trip_type = sys_get_trip_type, | |
250 | .set_trip_temp = sys_set_trip_temp, | |
251 | }; | |
252 | ||
253 | static bool pkg_thermal_rate_control(void) | |
254 | { | |
255 | return true; | |
256 | } | |
257 | ||
258 | /* Enable threshold interrupt on local package/cpu */ | |
259 | static inline void enable_pkg_thres_interrupt(void) | |
260 | { | |
261 | u8 thres_0, thres_1; | |
262 | u32 l, h; | |
263 | ||
264 | rdmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h); | |
265 | /* only enable/disable if it had valid threshold value */ | |
266 | thres_0 = (l & THERM_MASK_THRESHOLD0) >> THERM_SHIFT_THRESHOLD0; | |
267 | thres_1 = (l & THERM_MASK_THRESHOLD1) >> THERM_SHIFT_THRESHOLD1; | |
268 | if (thres_0) | |
269 | l |= THERM_INT_THRESHOLD0_ENABLE; | |
270 | if (thres_1) | |
271 | l |= THERM_INT_THRESHOLD1_ENABLE; | |
272 | wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h); | |
273 | } | |
274 | ||
275 | /* Disable threshold interrupt on local package/cpu */ | |
276 | static inline void disable_pkg_thres_interrupt(void) | |
277 | { | |
278 | u32 l, h; | |
279 | ||
280 | rdmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h); | |
281 | ||
282 | l &= ~(THERM_INT_THRESHOLD0_ENABLE | THERM_INT_THRESHOLD1_ENABLE); | |
283 | wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h); | |
284 | } | |
285 | ||
286 | static void pkg_temp_thermal_threshold_work_fn(struct work_struct *work) | |
287 | { | |
288 | struct thermal_zone_device *tzone = NULL; | |
289 | int cpu = smp_processor_id(); | |
290 | struct pkg_device *pkgdev; | |
291 | u64 msr_val, wr_val; | |
292 | ||
293 | mutex_lock(&thermal_zone_mutex); | |
294 | spin_lock_irq(&pkg_temp_lock); | |
295 | ++pkg_work_cnt; | |
296 | ||
297 | pkgdev = pkg_temp_thermal_get_dev(cpu); | |
298 | if (!pkgdev) { | |
299 | spin_unlock_irq(&pkg_temp_lock); | |
300 | mutex_unlock(&thermal_zone_mutex); | |
301 | return; | |
302 | } | |
303 | pkgdev->work_scheduled = false; | |
304 | ||
305 | rdmsrl(MSR_IA32_PACKAGE_THERM_STATUS, msr_val); | |
306 | wr_val = msr_val & ~(THERM_LOG_THRESHOLD0 | THERM_LOG_THRESHOLD1); | |
307 | if (wr_val != msr_val) { | |
308 | wrmsrl(MSR_IA32_PACKAGE_THERM_STATUS, wr_val); | |
309 | tzone = pkgdev->tzone; | |
310 | } | |
311 | ||
312 | enable_pkg_thres_interrupt(); | |
313 | spin_unlock_irq(&pkg_temp_lock); | |
314 | ||
315 | /* | |
316 | * If tzone is not NULL, then thermal_zone_mutex will prevent the | |
317 | * concurrent removal in the cpu offline callback. | |
318 | */ | |
319 | if (tzone) | |
320 | thermal_zone_device_update(tzone, THERMAL_EVENT_UNSPECIFIED); | |
321 | ||
322 | mutex_unlock(&thermal_zone_mutex); | |
323 | } | |
324 | ||
325 | static void pkg_thermal_schedule_work(int cpu, struct delayed_work *work) | |
326 | { | |
327 | unsigned long ms = msecs_to_jiffies(notify_delay_ms); | |
328 | ||
329 | schedule_delayed_work_on(cpu, work, ms); | |
330 | } | |
331 | ||
332 | static int pkg_thermal_notify(u64 msr_val) | |
333 | { | |
334 | int cpu = smp_processor_id(); | |
335 | struct pkg_device *pkgdev; | |
336 | unsigned long flags; | |
337 | ||
338 | spin_lock_irqsave(&pkg_temp_lock, flags); | |
339 | ++pkg_interrupt_cnt; | |
340 | ||
341 | disable_pkg_thres_interrupt(); | |
342 | ||
343 | /* Work is per package, so scheduling it once is enough. */ | |
344 | pkgdev = pkg_temp_thermal_get_dev(cpu); | |
345 | if (pkgdev && !pkgdev->work_scheduled) { | |
346 | pkgdev->work_scheduled = true; | |
347 | pkg_thermal_schedule_work(pkgdev->cpu, &pkgdev->work); | |
348 | } | |
349 | ||
350 | spin_unlock_irqrestore(&pkg_temp_lock, flags); | |
351 | return 0; | |
352 | } | |
353 | ||
354 | static int pkg_temp_thermal_device_add(unsigned int cpu) | |
355 | { | |
356 | int pkgid = topology_logical_package_id(cpu); | |
357 | u32 tj_max, eax, ebx, ecx, edx; | |
358 | struct pkg_device *pkgdev; | |
359 | int thres_count, err; | |
360 | ||
361 | if (pkgid >= max_packages) | |
362 | return -ENOMEM; | |
363 | ||
364 | cpuid(6, &eax, &ebx, &ecx, &edx); | |
365 | thres_count = ebx & 0x07; | |
366 | if (!thres_count) | |
367 | return -ENODEV; | |
368 | ||
369 | thres_count = clamp_val(thres_count, 0, MAX_NUMBER_OF_TRIPS); | |
370 | ||
371 | err = get_tj_max(cpu, &tj_max); | |
372 | if (err) | |
373 | return err; | |
374 | ||
375 | pkgdev = kzalloc(sizeof(*pkgdev), GFP_KERNEL); | |
376 | if (!pkgdev) | |
377 | return -ENOMEM; | |
378 | ||
379 | INIT_DELAYED_WORK(&pkgdev->work, pkg_temp_thermal_threshold_work_fn); | |
380 | pkgdev->cpu = cpu; | |
381 | pkgdev->tj_max = tj_max; | |
382 | pkgdev->tzone = thermal_zone_device_register("x86_pkg_temp", | |
383 | thres_count, | |
384 | (thres_count == MAX_NUMBER_OF_TRIPS) ? 0x03 : 0x01, | |
385 | pkgdev, &tzone_ops, &pkg_temp_tz_params, 0, 0); | |
386 | if (IS_ERR(pkgdev->tzone)) { | |
387 | err = PTR_ERR(pkgdev->tzone); | |
388 | kfree(pkgdev); | |
389 | return err; | |
390 | } | |
391 | /* Store MSR value for package thermal interrupt, to restore at exit */ | |
392 | rdmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, pkgdev->msr_pkg_therm_low, | |
393 | pkgdev->msr_pkg_therm_high); | |
394 | ||
395 | cpumask_set_cpu(cpu, &pkgdev->cpumask); | |
396 | spin_lock_irq(&pkg_temp_lock); | |
397 | packages[pkgid] = pkgdev; | |
398 | spin_unlock_irq(&pkg_temp_lock); | |
399 | return 0; | |
400 | } | |
401 | ||
402 | static int pkg_thermal_cpu_offline(unsigned int cpu) | |
403 | { | |
404 | struct pkg_device *pkgdev = pkg_temp_thermal_get_dev(cpu); | |
405 | bool lastcpu, was_target; | |
406 | int target; | |
407 | ||
408 | if (!pkgdev) | |
409 | return 0; | |
410 | ||
411 | target = cpumask_any_but(&pkgdev->cpumask, cpu); | |
412 | cpumask_clear_cpu(cpu, &pkgdev->cpumask); | |
413 | lastcpu = target >= nr_cpu_ids; | |
414 | /* | |
415 | * Remove the sysfs files, if this is the last cpu in the package | |
416 | * before doing further cleanups. | |
417 | */ | |
418 | if (lastcpu) { | |
419 | struct thermal_zone_device *tzone = pkgdev->tzone; | |
420 | ||
421 | /* | |
422 | * We must protect against a work function calling | |
423 | * thermal_zone_update, after/while unregister. We null out | |
424 | * the pointer under the zone mutex, so the worker function | |
425 | * won't try to call. | |
426 | */ | |
427 | mutex_lock(&thermal_zone_mutex); | |
428 | pkgdev->tzone = NULL; | |
429 | mutex_unlock(&thermal_zone_mutex); | |
430 | ||
431 | thermal_zone_device_unregister(tzone); | |
432 | } | |
433 | ||
434 | /* Protect against work and interrupts */ | |
435 | spin_lock_irq(&pkg_temp_lock); | |
436 | ||
437 | /* | |
438 | * Check whether this cpu was the current target and store the new | |
439 | * one. When we drop the lock, then the interrupt notify function | |
440 | * will see the new target. | |
441 | */ | |
442 | was_target = pkgdev->cpu == cpu; | |
443 | pkgdev->cpu = target; | |
444 | ||
445 | /* | |
446 | * If this is the last CPU in the package remove the package | |
447 | * reference from the array and restore the interrupt MSR. When we | |
448 | * drop the lock neither the interrupt notify function nor the | |
449 | * worker will see the package anymore. | |
450 | */ | |
451 | if (lastcpu) { | |
452 | packages[topology_logical_package_id(cpu)] = NULL; | |
453 | /* After this point nothing touches the MSR anymore. */ | |
454 | wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, | |
455 | pkgdev->msr_pkg_therm_low, pkgdev->msr_pkg_therm_high); | |
456 | } | |
457 | ||
458 | /* | |
459 | * Check whether there is work scheduled and whether the work is | |
460 | * targeted at the outgoing CPU. | |
461 | */ | |
462 | if (pkgdev->work_scheduled && was_target) { | |
463 | /* | |
464 | * To cancel the work we need to drop the lock, otherwise | |
465 | * we might deadlock if the work needs to be flushed. | |
466 | */ | |
467 | spin_unlock_irq(&pkg_temp_lock); | |
468 | cancel_delayed_work_sync(&pkgdev->work); | |
469 | spin_lock_irq(&pkg_temp_lock); | |
470 | /* | |
471 | * If this is not the last cpu in the package and the work | |
472 | * did not run after we dropped the lock above, then we | |
473 | * need to reschedule the work, otherwise the interrupt | |
474 | * stays disabled forever. | |
475 | */ | |
476 | if (!lastcpu && pkgdev->work_scheduled) | |
477 | pkg_thermal_schedule_work(target, &pkgdev->work); | |
478 | } | |
479 | ||
480 | spin_unlock_irq(&pkg_temp_lock); | |
481 | ||
482 | /* Final cleanup if this is the last cpu */ | |
483 | if (lastcpu) | |
484 | kfree(pkgdev); | |
485 | return 0; | |
486 | } | |
487 | ||
488 | static int pkg_thermal_cpu_online(unsigned int cpu) | |
489 | { | |
490 | struct pkg_device *pkgdev = pkg_temp_thermal_get_dev(cpu); | |
491 | struct cpuinfo_x86 *c = &cpu_data(cpu); | |
492 | ||
493 | /* Paranoia check */ | |
494 | if (!cpu_has(c, X86_FEATURE_DTHERM) || !cpu_has(c, X86_FEATURE_PTS)) | |
495 | return -ENODEV; | |
496 | ||
497 | /* If the package exists, nothing to do */ | |
498 | if (pkgdev) { | |
499 | cpumask_set_cpu(cpu, &pkgdev->cpumask); | |
500 | return 0; | |
501 | } | |
502 | return pkg_temp_thermal_device_add(cpu); | |
503 | } | |
504 | ||
505 | static const struct x86_cpu_id __initconst pkg_temp_thermal_ids[] = { | |
506 | { X86_VENDOR_INTEL, X86_FAMILY_ANY, X86_MODEL_ANY, X86_FEATURE_PTS }, | |
507 | {} | |
508 | }; | |
509 | MODULE_DEVICE_TABLE(x86cpu, pkg_temp_thermal_ids); | |
510 | ||
511 | static int __init pkg_temp_thermal_init(void) | |
512 | { | |
513 | int ret; | |
514 | ||
515 | if (!x86_match_cpu(pkg_temp_thermal_ids)) | |
516 | return -ENODEV; | |
517 | ||
518 | max_packages = topology_max_packages(); | |
519 | packages = kzalloc(max_packages * sizeof(struct pkg_device *), GFP_KERNEL); | |
520 | if (!packages) | |
521 | return -ENOMEM; | |
522 | ||
523 | ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "thermal/x86_pkg:online", | |
524 | pkg_thermal_cpu_online, pkg_thermal_cpu_offline); | |
525 | if (ret < 0) | |
526 | goto err; | |
527 | ||
528 | /* Store the state for module exit */ | |
529 | pkg_thermal_hp_state = ret; | |
530 | ||
531 | platform_thermal_package_notify = pkg_thermal_notify; | |
532 | platform_thermal_package_rate_control = pkg_thermal_rate_control; | |
533 | ||
534 | /* Don't care if it fails */ | |
535 | pkg_temp_debugfs_init(); | |
536 | return 0; | |
537 | ||
538 | err: | |
539 | kfree(packages); | |
540 | return ret; | |
541 | } | |
542 | module_init(pkg_temp_thermal_init) | |
543 | ||
544 | static void __exit pkg_temp_thermal_exit(void) | |
545 | { | |
546 | platform_thermal_package_notify = NULL; | |
547 | platform_thermal_package_rate_control = NULL; | |
548 | ||
549 | cpuhp_remove_state(pkg_thermal_hp_state); | |
550 | debugfs_remove_recursive(debugfs); | |
551 | kfree(packages); | |
552 | } | |
553 | module_exit(pkg_temp_thermal_exit) | |
554 | ||
555 | MODULE_DESCRIPTION("X86 PKG TEMP Thermal Driver"); | |
556 | MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); | |
557 | MODULE_LICENSE("GPL v2"); |