drivers/thermal/thermal_netlink.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright 2020 Linaro Limited
   4  *
   5  * Author: Daniel Lezcano <[email protected]>
   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
  18 static 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
  23 static 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
  60 struct 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
  79 typedef int (*cb_t)(struct param *);
  80
  81 static struct genl_family thermal_genl_family;
  82 static BLOCKING_NOTIFIER_HEAD(thermal_genl_chain);
  83
  84 static int thermal_group_has_listeners(enum thermal_genl_multicast_groups group)
  85 {
  86         return genl_has_listeners(&thermal_genl_family, &init_net, group);
  87 }
  88
  89 /************************** Sampling encoding *******************************/
  90
  91 int thermal_genl_sampling_temp(int id, int temp)
  92 {
  93         struct sk_buff *skb;
  94         void *hdr;
  95
  96         if (!thermal_group_has_listeners(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, 0, 0, &thermal_genl_family, 0,
 104                           THERMAL_GENL_SAMPLING_TEMP);
 105         if (!hdr)
 106                 goto out_free;
 107
 108         if (nla_put_u32(skb, THERMAL_GENL_ATTR_TZ_ID, id))
 109                 goto out_cancel;
 110
 111         if (nla_put_u32(skb, THERMAL_GENL_ATTR_TZ_TEMP, temp))
 112                 goto out_cancel;
 113
 114         genlmsg_end(skb, hdr);
 115
 116         genlmsg_multicast(&thermal_genl_family, skb, 0, THERMAL_GENL_SAMPLING_GROUP, GFP_KERNEL);
 117
 118         return 0;
 119 out_cancel:
 120         genlmsg_cancel(skb, hdr);
 121 out_free:
 122         nlmsg_free(skb);
 123
 124         return -EMSGSIZE;
 125 }
 126
 127 /**************************** Event encoding *********************************/
 128
 129 static int thermal_genl_event_tz_create(struct param *p)
 130 {
 131         if (nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_ID, p->tz_id) ||
 132             nla_put_string(p->msg, THERMAL_GENL_ATTR_TZ_NAME, p->name))
 133                 return -EMSGSIZE;
 134
 135         return 0;
 136 }
 137
 138 static int thermal_genl_event_tz(struct param *p)
 139 {
 140         if (nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_ID, p->tz_id))
 141                 return -EMSGSIZE;
 142
 143         return 0;
 144 }
 145
 146 static int thermal_genl_event_tz_trip_up(struct param *p)
 147 {
 148         if (nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_ID, p->tz_id) ||
 149             nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_TRIP_ID, p->trip_id) ||
 150             nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_TEMP, p->temp))
 151                 return -EMSGSIZE;
 152
 153         return 0;
 154 }
 155
 156 static int thermal_genl_event_tz_trip_change(struct param *p)
 157 {
 158         if (nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_ID, p->tz_id) ||
 159             nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_TRIP_ID, p->trip_id) ||
 160             nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_TRIP_TYPE, p->trip_type) ||
 161             nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_TRIP_TEMP, p->trip_temp) ||
 162             nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_TRIP_HYST, p->trip_hyst))
 163                 return -EMSGSIZE;
 164
 165         return 0;
 166 }
 167
 168 static int thermal_genl_event_cdev_add(struct param *p)
 169 {
 170         if (nla_put_string(p->msg, THERMAL_GENL_ATTR_CDEV_NAME,
 171                            p->name) ||
 172             nla_put_u32(p->msg, THERMAL_GENL_ATTR_CDEV_ID,
 173                         p->cdev_id) ||
 174             nla_put_u32(p->msg, THERMAL_GENL_ATTR_CDEV_MAX_STATE,
 175                         p->cdev_max_state))
 176                 return -EMSGSIZE;
 177
 178         return 0;
 179 }
 180
 181 static int thermal_genl_event_cdev_delete(struct param *p)
 182 {
 183         if (nla_put_u32(p->msg, THERMAL_GENL_ATTR_CDEV_ID, p->cdev_id))
 184                 return -EMSGSIZE;
 185
 186         return 0;
 187 }
 188
 189 static int thermal_genl_event_cdev_state_update(struct param *p)
 190 {
 191         if (nla_put_u32(p->msg, THERMAL_GENL_ATTR_CDEV_ID,
 192                         p->cdev_id) ||
 193             nla_put_u32(p->msg, THERMAL_GENL_ATTR_CDEV_CUR_STATE,
 194                         p->cdev_state))
 195                 return -EMSGSIZE;
 196
 197         return 0;
 198 }
 199
 200 static int thermal_genl_event_gov_change(struct param *p)
 201 {
 202         if (nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_ID, p->tz_id) ||
 203             nla_put_string(p->msg, THERMAL_GENL_ATTR_GOV_NAME, p->name))
 204                 return -EMSGSIZE;
 205
 206         return 0;
 207 }
 208
 209 static 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(msg, 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(msg, THERMAL_GENL_ATTR_CPU_CAPABILITY_ID,
 222                                 cpu_cap->cpu))
 223                         goto out_cancel_nest;
 224
 225                 if (nla_put_u32(msg, THERMAL_GENL_ATTR_CPU_CAPABILITY_PERFORMANCE,
 226                                 cpu_cap->performance))
 227                         goto out_cancel_nest;
 228
 229                 if (nla_put_u32(msg, THERMAL_GENL_ATTR_CPU_CAPABILITY_EFFICIENCY,
 230                                 cpu_cap->efficiency))
 231                         goto out_cancel_nest;
 232
 233                 ++cpu_cap;
 234         }
 235
 236         nla_nest_end(msg, start_cap);
 237
 238         return 0;
 239 out_cancel_nest:
 240         nla_nest_cancel(msg, start_cap);
 241
 242         return -EMSGSIZE;
 243 }
 244
 245 static int thermal_genl_event_threshold_add(struct param *p)
 246 {
 247         if (nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_ID, p->tz_id) ||
 248             nla_put_u32(p->msg, THERMAL_GENL_ATTR_THRESHOLD_TEMP, p->temp) ||
 249             nla_put_u32(p->msg, THERMAL_GENL_ATTR_THRESHOLD_DIRECTION, p->direction))
 250                 return -EMSGSIZE;
 251
 252         return 0;
 253 }
 254
 255 static int thermal_genl_event_threshold_flush(struct param *p)
 256 {
 257         if (nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_ID, p->tz_id))
 258                 return -EMSGSIZE;
 259
 260         return 0;
 261 }
 262
 263 static int thermal_genl_event_threshold_up(struct param *p)
 264 {
 265         if (nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_ID, p->tz_id) ||
 266             nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_PREV_TEMP, p->prev_temp) ||
 267             nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_TEMP, p->temp))
 268                 return -EMSGSIZE;
 269
 270         return 0;
 271 }
 272
 273 int thermal_genl_event_tz_delete(struct param *p)
 274         __attribute__((alias("thermal_genl_event_tz")));
 275
 276 int thermal_genl_event_tz_enable(struct param *p)
 277         __attribute__((alias("thermal_genl_event_tz")));
 278
 279 int thermal_genl_event_tz_disable(struct param *p)
 280         __attribute__((alias("thermal_genl_event_tz")));
 281
 282 int thermal_genl_event_tz_trip_down(struct param *p)
 283         __attribute__((alias("thermal_genl_event_tz_trip_up")));
 284
 285 int thermal_genl_event_threshold_delete(struct param *p)
 286         __attribute__((alias("thermal_genl_event_threshold_add")));
 287
 288 int thermal_genl_event_threshold_down(struct param *p)
 289         __attribute__((alias("thermal_genl_event_threshold_up")));
 290
 291 static 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  */
 314 static 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(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(msg, 0, 0, &thermal_genl_family, 0, 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(msg, hdr);
 338
 339         genlmsg_multicast(&thermal_genl_family, msg, 0, THERMAL_GENL_EVENT_GROUP, GFP_KERNEL);
 340
 341         return 0;
 342
 343 out_cancel_msg:
 344         genlmsg_cancel(msg, hdr);
 345 out_free_msg:
 346         nlmsg_free(msg);
 347
 348         return ret;
 349 }
 350
 351 int 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(THERMAL_GENL_EVENT_TZ_CREATE, &p);
 356 }
 357
 358 int 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(THERMAL_GENL_EVENT_TZ_DELETE, &p);
 363 }
 364
 365 int 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(THERMAL_GENL_EVENT_TZ_ENABLE, &p);
 370 }
 371
 372 int 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(THERMAL_GENL_EVENT_TZ_DISABLE, &p);
 377 }
 378
 379 int 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(THERMAL_GENL_EVENT_TZ_TRIP_DOWN, &p);
 387 }
 388
 389 int 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(THERMAL_GENL_EVENT_TZ_TRIP_UP, &p);
 397 }
 398
 399 int 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(THERMAL_GENL_EVENT_TZ_TRIP_CHANGE, &p);
 409 }
 410
 411 int 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(THERMAL_GENL_EVENT_CDEV_STATE_UPDATE, &p);
 417 }
 418
 419 int 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(THERMAL_GENL_EVENT_CDEV_ADD, &p);
 425 }
 426
 427 int 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(THERMAL_GENL_EVENT_CDEV_DELETE, &p);
 432 }
 433
 434 int 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(THERMAL_GENL_EVENT_TZ_GOV_CHANGE, &p);
 440 }
 441
 442 int 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(THERMAL_GENL_EVENT_CPU_CAPABILITY_CHANGE, &p);
 448 }
 449 EXPORT_SYMBOL_GPL(thermal_genl_cpu_capability_event);
 450
 451 int 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(THERMAL_GENL_EVENT_THRESHOLD_ADD, &p);
 457 }
 458
 459 int 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(THERMAL_GENL_EVENT_THRESHOLD_DELETE, &p);
 465 }
 466
 467 int 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(THERMAL_GENL_EVENT_THRESHOLD_FLUSH, &p);
 472 }
 473
 474 int 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(THERMAL_GENL_EVENT_THRESHOLD_DOWN, &p);
 479 }
 480
 481 int 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(THERMAL_GENL_EVENT_THRESHOLD_UP, &p);
 486 }
 487
 488 /*************************** Command encoding ********************************/
 489
 490 static 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(msg, THERMAL_GENL_ATTR_TZ_ID, tz->id) ||
 496             nla_put_string(msg, THERMAL_GENL_ATTR_TZ_NAME, tz->type))
 497                 return -EMSGSIZE;
 498
 499         return 0;
 500 }
 501
 502 static 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(msg, THERMAL_GENL_ATTR_TZ);
 509         if (!start_tz)
 510                 return -EMSGSIZE;
 511
 512         ret = for_each_thermal_zone(__thermal_genl_cmd_tz_get_id, msg);
 513         if (ret)
 514                 goto out_cancel_nest;
 515
 516         nla_nest_end(msg, start_tz);
 517
 518         return 0;
 519
 520 out_cancel_nest:
 521         nla_nest_cancel(msg, start_tz);
 522
 523         return ret;
 524 }
 525
 526 static 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(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(msg, THERMAL_GENL_ATTR_TZ_TRIP);
 543         if (!start_trip)
 544                 return -EMSGSIZE;
 545
 546         guard(thermal_zone)(tz);
 547
 548         for_each_trip_desc(tz, td) {
 549                 const struct thermal_trip *trip = &td->trip;
 550
 551                 if (nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_TRIP_ID,
 552                                 thermal_zone_trip_id(tz, trip)) ||
 553                     nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_TRIP_TYPE, trip->type) ||
 554                     nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_TRIP_TEMP, trip->temperature) ||
 555                     nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_TRIP_HYST, trip->hysteresis))
 556                         return -EMSGSIZE;
 557         }
 558
 559         nla_nest_end(msg, start_trip);
 560
 561         return 0;
 562 }
 563
 564 static 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(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);
 579         if (ret)
 580                 return ret;
 581
 582         if (nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_ID, id) ||
 583             nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_TEMP, temp))
 584                 return -EMSGSIZE;
 585
 586         return 0;
 587 }
 588
 589 static 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(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)(tz);
 604
 605         if (nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_ID, id) ||
 606             nla_put_string(msg, THERMAL_GENL_ATTR_TZ_GOV_NAME,
 607                            tz->governor->name))
 608                 return -EMSGSIZE;
 609
 610         return 0;
 611 }
 612
 613 static 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(msg, THERMAL_GENL_ATTR_CDEV_ID, cdev->id))
 619                 return -EMSGSIZE;
 620
 621         if (nla_put_string(msg, THERMAL_GENL_ATTR_CDEV_NAME, cdev->type))
 622                 return -EMSGSIZE;
 623
 624         return 0;
 625 }
 626
 627 static 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(msg, THERMAL_GENL_ATTR_CDEV);
 634         if (!start_cdev)
 635                 return -EMSGSIZE;
 636
 637         ret = for_each_thermal_cooling_device(__thermal_genl_cmd_cdev_get, msg);
 638         if (ret)
 639                 goto out_cancel_nest;
 640
 641         nla_nest_end(msg, start_cdev);
 642
 643         return 0;
 644 out_cancel_nest:
 645         nla_nest_cancel(msg, start_cdev);
 646
 647         return ret;
 648 }
 649
 650 static 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(msg, THERMAL_GENL_ATTR_THRESHOLD_TEMP, threshold->temperature) ||
 655             nla_put_u32(msg, THERMAL_GENL_ATTR_THRESHOLD_DIRECTION, threshold->direction))
 656                 return -1;
 657
 658         return 0;
 659 }
 660
 661 static 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(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(msg, THERMAL_GENL_ATTR_THRESHOLD);
 677         if (!start_trip)
 678                 return -EMSGSIZE;
 679
 680         ret = thermal_thresholds_for_each(tz, __thermal_genl_cmd_threshold_get, msg);
 681         if (ret)
 682                 return -EMSGSIZE;
 683
 684         nla_nest_end(msg, start_trip);
 685
 686         return 0;
 687 }
 688
 689 static 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(p->attrs[THERMAL_GENL_ATTR_TZ_ID]);
 702         temp = nla_get_u32(p->attrs[THERMAL_GENL_ATTR_THRESHOLD_TEMP]);
 703         direction = nla_get_u32(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)(tz);
 710
 711         return thermal_thresholds_add(tz, temp, direction);
 712 }
 713
 714 static 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(p->attrs[THERMAL_GENL_ATTR_TZ_ID]);
 727         temp = nla_get_u32(p->attrs[THERMAL_GENL_ATTR_THRESHOLD_TEMP]);
 728         direction = nla_get_u32(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)(tz);
 735
 736         return thermal_thresholds_delete(tz, temp, direction);
 737 }
 738
 739 static 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(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)(tz);
 756
 757         thermal_thresholds_flush(tz);
 758
 759         return 0;
 760 }
 761
 762 static 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
 774 static 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, 0, 0, &thermal_genl_family, 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
 795 out_cancel_msg:
 796         genlmsg_cancel(skb, hdr);
 797
 798         return ret;
 799 }
 800
 801 static 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(msg, info, &thermal_genl_family, 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(msg, hdr);
 824
 825         return genlmsg_reply(msg, info);
 826
 827 out_cancel_msg:
 828         genlmsg_cancel(msg, hdr);
 829 out_free_msg:
 830         nlmsg_free(msg);
 831
 832         return ret;
 833 }
 834
 835 static 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(&thermal_genl_chain, THERMAL_NOTIFY_BIND, &n);
 843         return 0;
 844 }
 845
 846 static 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(&thermal_genl_chain, THERMAL_NOTIFY_UNBIND, &n);
 854 }
 855
 856 static 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
 904 static 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
 919 int thermal_genl_register_notifier(struct notifier_block *nb)
 920 {
 921         return blocking_notifier_chain_register(&thermal_genl_chain, nb);
 922 }
 923
 924 int thermal_genl_unregister_notifier(struct notifier_block *nb)
 925 {
 926         return blocking_notifier_chain_unregister(&thermal_genl_chain, nb);
 927 }
 928
 929 int __init thermal_netlink_init(void)
 930 {
 931         return genl_register_family(&thermal_genl_family);
 932 }
 933
 934 void __init thermal_netlink_exit(void)
 935 {
 936         genl_unregister_family(&thermal_genl_family);
 937 }