1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright 2020 Linaro Limited
4 *
5 * Author: Daniel Lezcano <daniel.lezcano@linaro.org>
6 *
7 * Generic netlink for thermal management framework
8 */
9#include <linux/module.h>
10#include <linux/notifier.h>
11#include <linux/kernel.h>
12#include <net/sock.h>
13#include <net/genetlink.h>
14#include <uapi/linux/thermal.h>
15
16#include "thermal_core.h"
17
18static const struct genl_multicast_group thermal_genl_mcgrps[] = {
19 [THERMAL_GENL_SAMPLING_GROUP] = { .name = THERMAL_GENL_SAMPLING_GROUP_NAME, },
20 [THERMAL_GENL_EVENT_GROUP] = { .name = THERMAL_GENL_EVENT_GROUP_NAME, },
21};
22
23static const struct nla_policy thermal_genl_policy[THERMAL_GENL_ATTR_MAX + 1] = {
24 /* Thermal zone */
25 [THERMAL_GENL_ATTR_TZ] = { .type = NLA_NESTED },
26 [THERMAL_GENL_ATTR_TZ_ID] = { .type = NLA_U32 },
27 [THERMAL_GENL_ATTR_TZ_TEMP] = { .type = NLA_U32 },
28 [THERMAL_GENL_ATTR_TZ_TRIP] = { .type = NLA_NESTED },
29 [THERMAL_GENL_ATTR_TZ_TRIP_ID] = { .type = NLA_U32 },
30 [THERMAL_GENL_ATTR_TZ_TRIP_TEMP] = { .type = NLA_U32 },
31 [THERMAL_GENL_ATTR_TZ_TRIP_TYPE] = { .type = NLA_U32 },
32 [THERMAL_GENL_ATTR_TZ_TRIP_HYST] = { .type = NLA_U32 },
33 [THERMAL_GENL_ATTR_TZ_MODE] = { .type = NLA_U32 },
34 [THERMAL_GENL_ATTR_TZ_CDEV_WEIGHT] = { .type = NLA_U32 },
35 [THERMAL_GENL_ATTR_TZ_NAME] = { .type = NLA_STRING,
36 .len = THERMAL_NAME_LENGTH },
37 /* Governor(s) */
38 [THERMAL_GENL_ATTR_TZ_GOV] = { .type = NLA_NESTED },
39 [THERMAL_GENL_ATTR_TZ_GOV_NAME] = { .type = NLA_STRING,
40 .len = THERMAL_NAME_LENGTH },
41 /* Cooling devices */
42 [THERMAL_GENL_ATTR_CDEV] = { .type = NLA_NESTED },
43 [THERMAL_GENL_ATTR_CDEV_ID] = { .type = NLA_U32 },
44 [THERMAL_GENL_ATTR_CDEV_CUR_STATE] = { .type = NLA_U32 },
45 [THERMAL_GENL_ATTR_CDEV_MAX_STATE] = { .type = NLA_U32 },
46 [THERMAL_GENL_ATTR_CDEV_NAME] = { .type = NLA_STRING,
47 .len = THERMAL_NAME_LENGTH },
48 /* CPU capabilities */
49 [THERMAL_GENL_ATTR_CPU_CAPABILITY] = { .type = NLA_NESTED },
50 [THERMAL_GENL_ATTR_CPU_CAPABILITY_ID] = { .type = NLA_U32 },
51 [THERMAL_GENL_ATTR_CPU_CAPABILITY_PERFORMANCE] = { .type = NLA_U32 },
52 [THERMAL_GENL_ATTR_CPU_CAPABILITY_EFFICIENCY] = { .type = NLA_U32 },
53
54 /* Thresholds */
55 [THERMAL_GENL_ATTR_THRESHOLD] = { .type = NLA_NESTED },
56 [THERMAL_GENL_ATTR_THRESHOLD_TEMP] = { .type = NLA_U32 },
57 [THERMAL_GENL_ATTR_THRESHOLD_DIRECTION] = { .type = NLA_U32 },
58};
59
60struct param {
61 struct nlattr **attrs;
62 struct sk_buff *msg;
63 const char *name;
64 int tz_id;
65 int cdev_id;
66 int trip_id;
67 int trip_temp;
68 int trip_type;
69 int trip_hyst;
70 int temp;
71 int prev_temp;
72 int direction;
73 int cdev_state;
74 int cdev_max_state;
75 struct thermal_genl_cpu_caps *cpu_capabilities;
76 int cpu_capabilities_count;
77};
78
79typedef int (*cb_t)(struct param *);
80
81static struct genl_family thermal_genl_family;
82static BLOCKING_NOTIFIER_HEAD(thermal_genl_chain);
83
84static int thermal_group_has_listeners(enum thermal_genl_multicast_groups group)
85{
86 return genl_has_listeners(family: &thermal_genl_family, net: &init_net, group);
87}
88
89/************************** Sampling encoding *******************************/
90
91int thermal_genl_sampling_temp(int id, int temp)
92{
93 struct sk_buff *skb;
94 void *hdr;
95
96 if (!thermal_group_has_listeners(group: THERMAL_GENL_SAMPLING_GROUP))
97 return 0;
98
99 skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
100 if (!skb)
101 return -ENOMEM;
102
103 hdr = genlmsg_put(skb, portid: 0, seq: 0, family: &thermal_genl_family, flags: 0,
104 cmd: THERMAL_GENL_SAMPLING_TEMP);
105 if (!hdr)
106 goto out_free;
107
108 if (nla_put_u32(skb, attrtype: THERMAL_GENL_ATTR_TZ_ID, value: id))
109 goto out_cancel;
110
111 if (nla_put_u32(skb, attrtype: THERMAL_GENL_ATTR_TZ_TEMP, value: temp))
112 goto out_cancel;
113
114 genlmsg_end(skb, hdr);
115
116 genlmsg_multicast(family: &thermal_genl_family, skb, portid: 0, group: THERMAL_GENL_SAMPLING_GROUP, GFP_KERNEL);
117
118 return 0;
119out_cancel:
120 genlmsg_cancel(skb, hdr);
121out_free:
122 nlmsg_free(skb);
123
124 return -EMSGSIZE;
125}
126
127/**************************** Event encoding *********************************/
128
129static int thermal_genl_event_tz_create(struct param *p)
130{
131 if (nla_put_u32(skb: p->msg, attrtype: THERMAL_GENL_ATTR_TZ_ID, value: p->tz_id) ||
132 nla_put_string(skb: p->msg, attrtype: THERMAL_GENL_ATTR_TZ_NAME, str: p->name))
133 return -EMSGSIZE;
134
135 return 0;
136}
137
138static int thermal_genl_event_tz(struct param *p)
139{
140 if (nla_put_u32(skb: p->msg, attrtype: THERMAL_GENL_ATTR_TZ_ID, value: p->tz_id))
141 return -EMSGSIZE;
142
143 return 0;
144}
145
146static int thermal_genl_event_tz_trip_up(struct param *p)
147{
148 if (nla_put_u32(skb: p->msg, attrtype: THERMAL_GENL_ATTR_TZ_ID, value: p->tz_id) ||
149 nla_put_u32(skb: p->msg, attrtype: THERMAL_GENL_ATTR_TZ_TRIP_ID, value: p->trip_id) ||
150 nla_put_u32(skb: p->msg, attrtype: THERMAL_GENL_ATTR_TZ_TEMP, value: p->temp))
151 return -EMSGSIZE;
152
153 return 0;
154}
155
156static int thermal_genl_event_tz_trip_change(struct param *p)
157{
158 if (nla_put_u32(skb: p->msg, attrtype: THERMAL_GENL_ATTR_TZ_ID, value: p->tz_id) ||
159 nla_put_u32(skb: p->msg, attrtype: THERMAL_GENL_ATTR_TZ_TRIP_ID, value: p->trip_id) ||
160 nla_put_u32(skb: p->msg, attrtype: THERMAL_GENL_ATTR_TZ_TRIP_TYPE, value: p->trip_type) ||
161 nla_put_u32(skb: p->msg, attrtype: THERMAL_GENL_ATTR_TZ_TRIP_TEMP, value: p->trip_temp) ||
162 nla_put_u32(skb: p->msg, attrtype: THERMAL_GENL_ATTR_TZ_TRIP_HYST, value: p->trip_hyst))
163 return -EMSGSIZE;
164
165 return 0;
166}
167
168static int thermal_genl_event_cdev_add(struct param *p)
169{
170 if (nla_put_string(skb: p->msg, attrtype: THERMAL_GENL_ATTR_CDEV_NAME,
171 str: p->name) ||
172 nla_put_u32(skb: p->msg, attrtype: THERMAL_GENL_ATTR_CDEV_ID,
173 value: p->cdev_id) ||
174 nla_put_u32(skb: p->msg, attrtype: THERMAL_GENL_ATTR_CDEV_MAX_STATE,
175 value: p->cdev_max_state))
176 return -EMSGSIZE;
177
178 return 0;
179}
180
181static int thermal_genl_event_cdev_delete(struct param *p)
182{
183 if (nla_put_u32(skb: p->msg, attrtype: THERMAL_GENL_ATTR_CDEV_ID, value: p->cdev_id))
184 return -EMSGSIZE;
185
186 return 0;
187}
188
189static int thermal_genl_event_cdev_state_update(struct param *p)
190{
191 if (nla_put_u32(skb: p->msg, attrtype: THERMAL_GENL_ATTR_CDEV_ID,
192 value: p->cdev_id) ||
193 nla_put_u32(skb: p->msg, attrtype: THERMAL_GENL_ATTR_CDEV_CUR_STATE,
194 value: p->cdev_state))
195 return -EMSGSIZE;
196
197 return 0;
198}
199
200static int thermal_genl_event_gov_change(struct param *p)
201{
202 if (nla_put_u32(skb: p->msg, attrtype: THERMAL_GENL_ATTR_TZ_ID, value: p->tz_id) ||
203 nla_put_string(skb: p->msg, attrtype: THERMAL_GENL_ATTR_GOV_NAME, str: p->name))
204 return -EMSGSIZE;
205
206 return 0;
207}
208
209static int thermal_genl_event_cpu_capability_change(struct param *p)
210{
211 struct thermal_genl_cpu_caps *cpu_cap = p->cpu_capabilities;
212 struct sk_buff *msg = p->msg;
213 struct nlattr *start_cap;
214 int i;
215
216 start_cap = nla_nest_start(skb: msg, attrtype: THERMAL_GENL_ATTR_CPU_CAPABILITY);
217 if (!start_cap)
218 return -EMSGSIZE;
219
220 for (i = 0; i < p->cpu_capabilities_count; ++i) {
221 if (nla_put_u32(skb: msg, attrtype: THERMAL_GENL_ATTR_CPU_CAPABILITY_ID,
222 value: cpu_cap->cpu))
223 goto out_cancel_nest;
224
225 if (nla_put_u32(skb: msg, attrtype: THERMAL_GENL_ATTR_CPU_CAPABILITY_PERFORMANCE,
226 value: cpu_cap->performance))
227 goto out_cancel_nest;
228
229 if (nla_put_u32(skb: msg, attrtype: THERMAL_GENL_ATTR_CPU_CAPABILITY_EFFICIENCY,
230 value: cpu_cap->efficiency))
231 goto out_cancel_nest;
232
233 ++cpu_cap;
234 }
235
236 nla_nest_end(skb: msg, start: start_cap);
237
238 return 0;
239out_cancel_nest:
240 nla_nest_cancel(skb: msg, start: start_cap);
241
242 return -EMSGSIZE;
243}
244
245static int thermal_genl_event_threshold_add(struct param *p)
246{
247 if (nla_put_u32(skb: p->msg, attrtype: THERMAL_GENL_ATTR_TZ_ID, value: p->tz_id) ||
248 nla_put_u32(skb: p->msg, attrtype: THERMAL_GENL_ATTR_THRESHOLD_TEMP, value: p->temp) ||
249 nla_put_u32(skb: p->msg, attrtype: THERMAL_GENL_ATTR_THRESHOLD_DIRECTION, value: p->direction))
250 return -EMSGSIZE;
251
252 return 0;
253}
254
255static int thermal_genl_event_threshold_flush(struct param *p)
256{
257 if (nla_put_u32(skb: p->msg, attrtype: THERMAL_GENL_ATTR_TZ_ID, value: p->tz_id))
258 return -EMSGSIZE;
259
260 return 0;
261}
262
263static int thermal_genl_event_threshold_up(struct param *p)
264{
265 if (nla_put_u32(skb: p->msg, attrtype: THERMAL_GENL_ATTR_TZ_ID, value: p->tz_id) ||
266 nla_put_u32(skb: p->msg, attrtype: THERMAL_GENL_ATTR_TZ_PREV_TEMP, value: p->prev_temp) ||
267 nla_put_u32(skb: p->msg, attrtype: THERMAL_GENL_ATTR_TZ_TEMP, value: p->temp))
268 return -EMSGSIZE;
269
270 return 0;
271}
272
273int thermal_genl_event_tz_delete(struct param *p)
274 __attribute__((alias("thermal_genl_event_tz")));
275
276int thermal_genl_event_tz_enable(struct param *p)
277 __attribute__((alias("thermal_genl_event_tz")));
278
279int thermal_genl_event_tz_disable(struct param *p)
280 __attribute__((alias("thermal_genl_event_tz")));
281
282int thermal_genl_event_tz_trip_down(struct param *p)
283 __attribute__((alias("thermal_genl_event_tz_trip_up")));
284
285int thermal_genl_event_threshold_delete(struct param *p)
286 __attribute__((alias("thermal_genl_event_threshold_add")));
287
288int thermal_genl_event_threshold_down(struct param *p)
289 __attribute__((alias("thermal_genl_event_threshold_up")));
290
291static cb_t event_cb[] = {
292 [THERMAL_GENL_EVENT_TZ_CREATE] = thermal_genl_event_tz_create,
293 [THERMAL_GENL_EVENT_TZ_DELETE] = thermal_genl_event_tz_delete,
294 [THERMAL_GENL_EVENT_TZ_ENABLE] = thermal_genl_event_tz_enable,
295 [THERMAL_GENL_EVENT_TZ_DISABLE] = thermal_genl_event_tz_disable,
296 [THERMAL_GENL_EVENT_TZ_TRIP_UP] = thermal_genl_event_tz_trip_up,
297 [THERMAL_GENL_EVENT_TZ_TRIP_DOWN] = thermal_genl_event_tz_trip_down,
298 [THERMAL_GENL_EVENT_TZ_TRIP_CHANGE] = thermal_genl_event_tz_trip_change,
299 [THERMAL_GENL_EVENT_CDEV_ADD] = thermal_genl_event_cdev_add,
300 [THERMAL_GENL_EVENT_CDEV_DELETE] = thermal_genl_event_cdev_delete,
301 [THERMAL_GENL_EVENT_CDEV_STATE_UPDATE] = thermal_genl_event_cdev_state_update,
302 [THERMAL_GENL_EVENT_TZ_GOV_CHANGE] = thermal_genl_event_gov_change,
303 [THERMAL_GENL_EVENT_CPU_CAPABILITY_CHANGE] = thermal_genl_event_cpu_capability_change,
304 [THERMAL_GENL_EVENT_THRESHOLD_ADD] = thermal_genl_event_threshold_add,
305 [THERMAL_GENL_EVENT_THRESHOLD_DELETE] = thermal_genl_event_threshold_delete,
306 [THERMAL_GENL_EVENT_THRESHOLD_FLUSH] = thermal_genl_event_threshold_flush,
307 [THERMAL_GENL_EVENT_THRESHOLD_DOWN] = thermal_genl_event_threshold_down,
308 [THERMAL_GENL_EVENT_THRESHOLD_UP] = thermal_genl_event_threshold_up,
309};
310
311/*
312 * Generic netlink event encoding
313 */
314static int thermal_genl_send_event(enum thermal_genl_event event,
315 struct param *p)
316{
317 struct sk_buff *msg;
318 int ret = -EMSGSIZE;
319 void *hdr;
320
321 if (!thermal_group_has_listeners(group: THERMAL_GENL_EVENT_GROUP))
322 return 0;
323
324 msg = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
325 if (!msg)
326 return -ENOMEM;
327 p->msg = msg;
328
329 hdr = genlmsg_put(skb: msg, portid: 0, seq: 0, family: &thermal_genl_family, flags: 0, cmd: event);
330 if (!hdr)
331 goto out_free_msg;
332
333 ret = event_cb[event](p);
334 if (ret)
335 goto out_cancel_msg;
336
337 genlmsg_end(skb: msg, hdr);
338
339 genlmsg_multicast(family: &thermal_genl_family, skb: msg, portid: 0, group: THERMAL_GENL_EVENT_GROUP, GFP_KERNEL);
340
341 return 0;
342
343out_cancel_msg:
344 genlmsg_cancel(skb: msg, hdr);
345out_free_msg:
346 nlmsg_free(skb: msg);
347
348 return ret;
349}
350
351int thermal_notify_tz_create(const struct thermal_zone_device *tz)
352{
353 struct param p = { .tz_id = tz->id, .name = tz->type };
354
355 return thermal_genl_send_event(event: THERMAL_GENL_EVENT_TZ_CREATE, p: &p);
356}
357
358int thermal_notify_tz_delete(const struct thermal_zone_device *tz)
359{
360 struct param p = { .tz_id = tz->id };
361
362 return thermal_genl_send_event(event: THERMAL_GENL_EVENT_TZ_DELETE, p: &p);
363}
364
365int thermal_notify_tz_enable(const struct thermal_zone_device *tz)
366{
367 struct param p = { .tz_id = tz->id };
368
369 return thermal_genl_send_event(event: THERMAL_GENL_EVENT_TZ_ENABLE, p: &p);
370}
371
372int thermal_notify_tz_disable(const struct thermal_zone_device *tz)
373{
374 struct param p = { .tz_id = tz->id };
375
376 return thermal_genl_send_event(event: THERMAL_GENL_EVENT_TZ_DISABLE, p: &p);
377}
378
379int thermal_notify_tz_trip_down(const struct thermal_zone_device *tz,
380 const struct thermal_trip *trip)
381{
382 struct param p = { .tz_id = tz->id,
383 .trip_id = thermal_zone_trip_id(tz, trip),
384 .temp = tz->temperature };
385
386 return thermal_genl_send_event(event: THERMAL_GENL_EVENT_TZ_TRIP_DOWN, p: &p);
387}
388
389int thermal_notify_tz_trip_up(const struct thermal_zone_device *tz,
390 const struct thermal_trip *trip)
391{
392 struct param p = { .tz_id = tz->id,
393 .trip_id = thermal_zone_trip_id(tz, trip),
394 .temp = tz->temperature };
395
396 return thermal_genl_send_event(event: THERMAL_GENL_EVENT_TZ_TRIP_UP, p: &p);
397}
398
399int thermal_notify_tz_trip_change(const struct thermal_zone_device *tz,
400 const struct thermal_trip *trip)
401{
402 struct param p = { .tz_id = tz->id,
403 .trip_id = thermal_zone_trip_id(tz, trip),
404 .trip_type = trip->type,
405 .trip_temp = trip->temperature,
406 .trip_hyst = trip->hysteresis };
407
408 return thermal_genl_send_event(event: THERMAL_GENL_EVENT_TZ_TRIP_CHANGE, p: &p);
409}
410
411int thermal_notify_cdev_state_update(const struct thermal_cooling_device *cdev,
412 int state)
413{
414 struct param p = { .cdev_id = cdev->id, .cdev_state = state };
415
416 return thermal_genl_send_event(event: THERMAL_GENL_EVENT_CDEV_STATE_UPDATE, p: &p);
417}
418
419int thermal_notify_cdev_add(const struct thermal_cooling_device *cdev)
420{
421 struct param p = { .cdev_id = cdev->id, .name = cdev->type,
422 .cdev_max_state = cdev->max_state };
423
424 return thermal_genl_send_event(event: THERMAL_GENL_EVENT_CDEV_ADD, p: &p);
425}
426
427int thermal_notify_cdev_delete(const struct thermal_cooling_device *cdev)
428{
429 struct param p = { .cdev_id = cdev->id };
430
431 return thermal_genl_send_event(event: THERMAL_GENL_EVENT_CDEV_DELETE, p: &p);
432}
433
434int thermal_notify_tz_gov_change(const struct thermal_zone_device *tz,
435 const char *name)
436{
437 struct param p = { .tz_id = tz->id, .name = name };
438
439 return thermal_genl_send_event(event: THERMAL_GENL_EVENT_TZ_GOV_CHANGE, p: &p);
440}
441
442int thermal_genl_cpu_capability_event(int count,
443 struct thermal_genl_cpu_caps *caps)
444{
445 struct param p = { .cpu_capabilities_count = count, .cpu_capabilities = caps };
446
447 return thermal_genl_send_event(event: THERMAL_GENL_EVENT_CPU_CAPABILITY_CHANGE, p: &p);
448}
449EXPORT_SYMBOL_GPL(thermal_genl_cpu_capability_event);
450
451int thermal_notify_threshold_add(const struct thermal_zone_device *tz,
452 int temperature, int direction)
453{
454 struct param p = { .tz_id = tz->id, .temp = temperature, .direction = direction };
455
456 return thermal_genl_send_event(event: THERMAL_GENL_EVENT_THRESHOLD_ADD, p: &p);
457}
458
459int thermal_notify_threshold_delete(const struct thermal_zone_device *tz,
460 int temperature, int direction)
461{
462 struct param p = { .tz_id = tz->id, .temp = temperature, .direction = direction };
463
464 return thermal_genl_send_event(event: THERMAL_GENL_EVENT_THRESHOLD_DELETE, p: &p);
465}
466
467int thermal_notify_threshold_flush(const struct thermal_zone_device *tz)
468{
469 struct param p = { .tz_id = tz->id };
470
471 return thermal_genl_send_event(event: THERMAL_GENL_EVENT_THRESHOLD_FLUSH, p: &p);
472}
473
474int thermal_notify_threshold_down(const struct thermal_zone_device *tz)
475{
476 struct param p = { .tz_id = tz->id, .temp = tz->temperature, .prev_temp = tz->last_temperature };
477
478 return thermal_genl_send_event(event: THERMAL_GENL_EVENT_THRESHOLD_DOWN, p: &p);
479}
480
481int thermal_notify_threshold_up(const struct thermal_zone_device *tz)
482{
483 struct param p = { .tz_id = tz->id, .temp = tz->temperature, .prev_temp = tz->last_temperature };
484
485 return thermal_genl_send_event(event: THERMAL_GENL_EVENT_THRESHOLD_UP, p: &p);
486}
487
488/*************************** Command encoding ********************************/
489
490static int __thermal_genl_cmd_tz_get_id(struct thermal_zone_device *tz,
491 void *data)
492{
493 struct sk_buff *msg = data;
494
495 if (nla_put_u32(skb: msg, attrtype: THERMAL_GENL_ATTR_TZ_ID, value: tz->id) ||
496 nla_put_string(skb: msg, attrtype: THERMAL_GENL_ATTR_TZ_NAME, str: tz->type))
497 return -EMSGSIZE;
498
499 return 0;
500}
501
502static int thermal_genl_cmd_tz_get_id(struct param *p)
503{
504 struct sk_buff *msg = p->msg;
505 struct nlattr *start_tz;
506 int ret;
507
508 start_tz = nla_nest_start(skb: msg, attrtype: THERMAL_GENL_ATTR_TZ);
509 if (!start_tz)
510 return -EMSGSIZE;
511
512 ret = for_each_thermal_zone(cb: __thermal_genl_cmd_tz_get_id, msg);
513 if (ret)
514 goto out_cancel_nest;
515
516 nla_nest_end(skb: msg, start: start_tz);
517
518 return 0;
519
520out_cancel_nest:
521 nla_nest_cancel(skb: msg, start: start_tz);
522
523 return ret;
524}
525
526static int thermal_genl_cmd_tz_get_trip(struct param *p)
527{
528 struct sk_buff *msg = p->msg;
529 const struct thermal_trip_desc *td;
530 struct nlattr *start_trip;
531 int id;
532
533 if (!p->attrs[THERMAL_GENL_ATTR_TZ_ID])
534 return -EINVAL;
535
536 id = nla_get_u32(nla: p->attrs[THERMAL_GENL_ATTR_TZ_ID]);
537
538 CLASS(thermal_zone_get_by_id, tz)(id);
539 if (!tz)
540 return -EINVAL;
541
542 start_trip = nla_nest_start(skb: msg, attrtype: THERMAL_GENL_ATTR_TZ_TRIP);
543 if (!start_trip)
544 return -EMSGSIZE;
545
546 guard(thermal_zone)(T: tz);
547
548 for_each_trip_desc(tz, td) {
549 const struct thermal_trip *trip = &td->trip;
550
551 if (nla_put_u32(skb: msg, attrtype: THERMAL_GENL_ATTR_TZ_TRIP_ID,
552 value: thermal_zone_trip_id(tz, trip)) ||
553 nla_put_u32(skb: msg, attrtype: THERMAL_GENL_ATTR_TZ_TRIP_TYPE, value: trip->type) ||
554 nla_put_u32(skb: msg, attrtype: THERMAL_GENL_ATTR_TZ_TRIP_TEMP, value: trip->temperature) ||
555 nla_put_u32(skb: msg, attrtype: THERMAL_GENL_ATTR_TZ_TRIP_HYST, value: trip->hysteresis))
556 return -EMSGSIZE;
557 }
558
559 nla_nest_end(skb: msg, start: start_trip);
560
561 return 0;
562}
563
564static int thermal_genl_cmd_tz_get_temp(struct param *p)
565{
566 struct sk_buff *msg = p->msg;
567 int temp, ret, id;
568
569 if (!p->attrs[THERMAL_GENL_ATTR_TZ_ID])
570 return -EINVAL;
571
572 id = nla_get_u32(nla: p->attrs[THERMAL_GENL_ATTR_TZ_ID]);
573
574 CLASS(thermal_zone_get_by_id, tz)(id);
575 if (!tz)
576 return -EINVAL;
577
578 ret = thermal_zone_get_temp(tz, temp: &temp);
579 if (ret)
580 return ret;
581
582 if (nla_put_u32(skb: msg, attrtype: THERMAL_GENL_ATTR_TZ_ID, value: id) ||
583 nla_put_u32(skb: msg, attrtype: THERMAL_GENL_ATTR_TZ_TEMP, value: temp))
584 return -EMSGSIZE;
585
586 return 0;
587}
588
589static int thermal_genl_cmd_tz_get_gov(struct param *p)
590{
591 struct sk_buff *msg = p->msg;
592 int id;
593
594 if (!p->attrs[THERMAL_GENL_ATTR_TZ_ID])
595 return -EINVAL;
596
597 id = nla_get_u32(nla: p->attrs[THERMAL_GENL_ATTR_TZ_ID]);
598
599 CLASS(thermal_zone_get_by_id, tz)(id);
600 if (!tz)
601 return -EINVAL;
602
603 guard(thermal_zone)(T: tz);
604
605 if (nla_put_u32(skb: msg, attrtype: THERMAL_GENL_ATTR_TZ_ID, value: id) ||
606 nla_put_string(skb: msg, attrtype: THERMAL_GENL_ATTR_TZ_GOV_NAME,
607 str: tz->governor->name))
608 return -EMSGSIZE;
609
610 return 0;
611}
612
613static int __thermal_genl_cmd_cdev_get(struct thermal_cooling_device *cdev,
614 void *data)
615{
616 struct sk_buff *msg = data;
617
618 if (nla_put_u32(skb: msg, attrtype: THERMAL_GENL_ATTR_CDEV_ID, value: cdev->id))
619 return -EMSGSIZE;
620
621 if (nla_put_string(skb: msg, attrtype: THERMAL_GENL_ATTR_CDEV_NAME, str: cdev->type))
622 return -EMSGSIZE;
623
624 return 0;
625}
626
627static int thermal_genl_cmd_cdev_get(struct param *p)
628{
629 struct sk_buff *msg = p->msg;
630 struct nlattr *start_cdev;
631 int ret;
632
633 start_cdev = nla_nest_start(skb: msg, attrtype: THERMAL_GENL_ATTR_CDEV);
634 if (!start_cdev)
635 return -EMSGSIZE;
636
637 ret = for_each_thermal_cooling_device(cb: __thermal_genl_cmd_cdev_get, msg);
638 if (ret)
639 goto out_cancel_nest;
640
641 nla_nest_end(skb: msg, start: start_cdev);
642
643 return 0;
644out_cancel_nest:
645 nla_nest_cancel(skb: msg, start: start_cdev);
646
647 return ret;
648}
649
650static int __thermal_genl_cmd_threshold_get(struct user_threshold *threshold, void *arg)
651{
652 struct sk_buff *msg = arg;
653
654 if (nla_put_u32(skb: msg, attrtype: THERMAL_GENL_ATTR_THRESHOLD_TEMP, value: threshold->temperature) ||
655 nla_put_u32(skb: msg, attrtype: THERMAL_GENL_ATTR_THRESHOLD_DIRECTION, value: threshold->direction))
656 return -1;
657
658 return 0;
659}
660
661static int thermal_genl_cmd_threshold_get(struct param *p)
662{
663 struct sk_buff *msg = p->msg;
664 struct nlattr *start_trip;
665 int id, ret;
666
667 if (!p->attrs[THERMAL_GENL_ATTR_TZ_ID])
668 return -EINVAL;
669
670 id = nla_get_u32(nla: p->attrs[THERMAL_GENL_ATTR_TZ_ID]);
671
672 CLASS(thermal_zone_get_by_id, tz)(id);
673 if (!tz)
674 return -EINVAL;
675
676 start_trip = nla_nest_start(skb: msg, attrtype: THERMAL_GENL_ATTR_THRESHOLD);
677 if (!start_trip)
678 return -EMSGSIZE;
679
680 ret = thermal_thresholds_for_each(tz, cb: __thermal_genl_cmd_threshold_get, arg: msg);
681 if (ret)
682 return -EMSGSIZE;
683
684 nla_nest_end(skb: msg, start: start_trip);
685
686 return 0;
687}
688
689static int thermal_genl_cmd_threshold_add(struct param *p)
690{
691 int id, temp, direction;
692
693 if (!capable(CAP_SYS_ADMIN))
694 return -EPERM;
695
696 if (!p->attrs[THERMAL_GENL_ATTR_TZ_ID] ||
697 !p->attrs[THERMAL_GENL_ATTR_THRESHOLD_TEMP] ||
698 !p->attrs[THERMAL_GENL_ATTR_THRESHOLD_DIRECTION])
699 return -EINVAL;
700
701 id = nla_get_u32(nla: p->attrs[THERMAL_GENL_ATTR_TZ_ID]);
702 temp = nla_get_u32(nla: p->attrs[THERMAL_GENL_ATTR_THRESHOLD_TEMP]);
703 direction = nla_get_u32(nla: p->attrs[THERMAL_GENL_ATTR_THRESHOLD_DIRECTION]);
704
705 CLASS(thermal_zone_get_by_id, tz)(id);
706 if (!tz)
707 return -EINVAL;
708
709 guard(thermal_zone)(T: tz);
710
711 return thermal_thresholds_add(tz, temperature: temp, direction);
712}
713
714static int thermal_genl_cmd_threshold_delete(struct param *p)
715{
716 int id, temp, direction;
717
718 if (!capable(CAP_SYS_ADMIN))
719 return -EPERM;
720
721 if (!p->attrs[THERMAL_GENL_ATTR_TZ_ID] ||
722 !p->attrs[THERMAL_GENL_ATTR_THRESHOLD_TEMP] ||
723 !p->attrs[THERMAL_GENL_ATTR_THRESHOLD_DIRECTION])
724 return -EINVAL;
725
726 id = nla_get_u32(nla: p->attrs[THERMAL_GENL_ATTR_TZ_ID]);
727 temp = nla_get_u32(nla: p->attrs[THERMAL_GENL_ATTR_THRESHOLD_TEMP]);
728 direction = nla_get_u32(nla: p->attrs[THERMAL_GENL_ATTR_THRESHOLD_DIRECTION]);
729
730 CLASS(thermal_zone_get_by_id, tz)(id);
731 if (!tz)
732 return -EINVAL;
733
734 guard(thermal_zone)(T: tz);
735
736 return thermal_thresholds_delete(tz, temperature: temp, direction);
737}
738
739static int thermal_genl_cmd_threshold_flush(struct param *p)
740{
741 int id;
742
743 if (!capable(CAP_SYS_ADMIN))
744 return -EPERM;
745
746 if (!p->attrs[THERMAL_GENL_ATTR_TZ_ID])
747 return -EINVAL;
748
749 id = nla_get_u32(nla: p->attrs[THERMAL_GENL_ATTR_TZ_ID]);
750
751 CLASS(thermal_zone_get_by_id, tz)(id);
752 if (!tz)
753 return -EINVAL;
754
755 guard(thermal_zone)(T: tz);
756
757 thermal_thresholds_flush(tz);
758
759 return 0;
760}
761
762static cb_t cmd_cb[] = {
763 [THERMAL_GENL_CMD_TZ_GET_ID] = thermal_genl_cmd_tz_get_id,
764 [THERMAL_GENL_CMD_TZ_GET_TRIP] = thermal_genl_cmd_tz_get_trip,
765 [THERMAL_GENL_CMD_TZ_GET_TEMP] = thermal_genl_cmd_tz_get_temp,
766 [THERMAL_GENL_CMD_TZ_GET_GOV] = thermal_genl_cmd_tz_get_gov,
767 [THERMAL_GENL_CMD_CDEV_GET] = thermal_genl_cmd_cdev_get,
768 [THERMAL_GENL_CMD_THRESHOLD_GET] = thermal_genl_cmd_threshold_get,
769 [THERMAL_GENL_CMD_THRESHOLD_ADD] = thermal_genl_cmd_threshold_add,
770 [THERMAL_GENL_CMD_THRESHOLD_DELETE] = thermal_genl_cmd_threshold_delete,
771 [THERMAL_GENL_CMD_THRESHOLD_FLUSH] = thermal_genl_cmd_threshold_flush,
772};
773
774static int thermal_genl_cmd_dumpit(struct sk_buff *skb,
775 struct netlink_callback *cb)
776{
777 struct param p = { .msg = skb };
778 const struct genl_dumpit_info *info = genl_dumpit_info(cb);
779 int cmd = info->op.cmd;
780 int ret;
781 void *hdr;
782
783 hdr = genlmsg_put(skb, portid: 0, seq: 0, family: &thermal_genl_family, flags: 0, cmd);
784 if (!hdr)
785 return -EMSGSIZE;
786
787 ret = cmd_cb[cmd](&p);
788 if (ret)
789 goto out_cancel_msg;
790
791 genlmsg_end(skb, hdr);
792
793 return 0;
794
795out_cancel_msg:
796 genlmsg_cancel(skb, hdr);
797
798 return ret;
799}
800
801static int thermal_genl_cmd_doit(struct sk_buff *skb,
802 struct genl_info *info)
803{
804 struct param p = { .attrs = info->attrs };
805 struct sk_buff *msg;
806 void *hdr;
807 int cmd = info->genlhdr->cmd;
808 int ret = -EMSGSIZE;
809
810 msg = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
811 if (!msg)
812 return -ENOMEM;
813 p.msg = msg;
814
815 hdr = genlmsg_put_reply(skb: msg, info, family: &thermal_genl_family, flags: 0, cmd);
816 if (!hdr)
817 goto out_free_msg;
818
819 ret = cmd_cb[cmd](&p);
820 if (ret)
821 goto out_cancel_msg;
822
823 genlmsg_end(skb: msg, hdr);
824
825 return genlmsg_reply(skb: msg, info);
826
827out_cancel_msg:
828 genlmsg_cancel(skb: msg, hdr);
829out_free_msg:
830 nlmsg_free(skb: msg);
831
832 return ret;
833}
834
835static int thermal_genl_bind(int mcgrp)
836{
837 struct thermal_genl_notify n = { .mcgrp = mcgrp };
838
839 if (WARN_ON_ONCE(mcgrp > THERMAL_GENL_MAX_GROUP))
840 return -EINVAL;
841
842 blocking_notifier_call_chain(nh: &thermal_genl_chain, THERMAL_NOTIFY_BIND, v: &n);
843 return 0;
844}
845
846static void thermal_genl_unbind(int mcgrp)
847{
848 struct thermal_genl_notify n = { .mcgrp = mcgrp };
849
850 if (WARN_ON_ONCE(mcgrp > THERMAL_GENL_MAX_GROUP))
851 return;
852
853 blocking_notifier_call_chain(nh: &thermal_genl_chain, THERMAL_NOTIFY_UNBIND, v: &n);
854}
855
856static const struct genl_small_ops thermal_genl_ops[] = {
857 {
858 .cmd = THERMAL_GENL_CMD_TZ_GET_ID,
859 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
860 .dumpit = thermal_genl_cmd_dumpit,
861 },
862 {
863 .cmd = THERMAL_GENL_CMD_TZ_GET_TRIP,
864 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
865 .doit = thermal_genl_cmd_doit,
866 },
867 {
868 .cmd = THERMAL_GENL_CMD_TZ_GET_TEMP,
869 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
870 .doit = thermal_genl_cmd_doit,
871 },
872 {
873 .cmd = THERMAL_GENL_CMD_TZ_GET_GOV,
874 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
875 .doit = thermal_genl_cmd_doit,
876 },
877 {
878 .cmd = THERMAL_GENL_CMD_CDEV_GET,
879 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
880 .dumpit = thermal_genl_cmd_dumpit,
881 },
882 {
883 .cmd = THERMAL_GENL_CMD_THRESHOLD_GET,
884 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
885 .doit = thermal_genl_cmd_doit,
886 },
887 {
888 .cmd = THERMAL_GENL_CMD_THRESHOLD_ADD,
889 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
890 .doit = thermal_genl_cmd_doit,
891 },
892 {
893 .cmd = THERMAL_GENL_CMD_THRESHOLD_DELETE,
894 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
895 .doit = thermal_genl_cmd_doit,
896 },
897 {
898 .cmd = THERMAL_GENL_CMD_THRESHOLD_FLUSH,
899 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
900 .doit = thermal_genl_cmd_doit,
901 },
902};
903
904static struct genl_family thermal_genl_family __ro_after_init = {
905 .hdrsize = 0,
906 .name = THERMAL_GENL_FAMILY_NAME,
907 .version = THERMAL_GENL_VERSION,
908 .maxattr = THERMAL_GENL_ATTR_MAX,
909 .policy = thermal_genl_policy,
910 .bind = thermal_genl_bind,
911 .unbind = thermal_genl_unbind,
912 .small_ops = thermal_genl_ops,
913 .n_small_ops = ARRAY_SIZE(thermal_genl_ops),
914 .resv_start_op = __THERMAL_GENL_CMD_MAX,
915 .mcgrps = thermal_genl_mcgrps,
916 .n_mcgrps = ARRAY_SIZE(thermal_genl_mcgrps),
917};
918
919int thermal_genl_register_notifier(struct notifier_block *nb)
920{
921 return blocking_notifier_chain_register(nh: &thermal_genl_chain, nb);
922}
923
924int thermal_genl_unregister_notifier(struct notifier_block *nb)
925{
926 return blocking_notifier_chain_unregister(nh: &thermal_genl_chain, nb);
927}
928
929int __init thermal_netlink_init(void)
930{
931 return genl_register_family(family: &thermal_genl_family);
932}
933
934void __init thermal_netlink_exit(void)
935{
936 genl_unregister_family(family: &thermal_genl_family);
937}
938