drivers/gpu/drm/nouveau/nouveau_pm.c

   1 /*
   2  * Copyright 2010 Red Hat Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: Ben Skeggs
  23  */
  24
  25 #include "drmP.h"
  26
  27 #include "nouveau_drv.h"
  28 #include "nouveau_pm.h"
  29 #include "nouveau_gpio.h"
  30
  31 #ifdef CONFIG_ACPI
  32 #include <linux/acpi.h>
  33 #endif
  34 #include <linux/power_supply.h>
  35 #include <linux/hwmon.h>
  36 #include <linux/hwmon-sysfs.h>
  37
  38 static int
  39 nouveau_pwmfan_get(struct drm_device *dev)
  40 {
  41         struct drm_nouveau_private *dev_priv = dev->dev_private;
  42         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
  43         struct gpio_func gpio;
  44         u32 divs, duty;
  45         int ret;
  46
  47         if (!pm->pwm_get)
  48                 return -ENODEV;
  49
  50         ret = nouveau_gpio_find(dev, 0, DCB_GPIO_PWM_FAN, 0xff, &gpio);
  51         if (ret == 0) {
  52                 ret = pm->pwm_get(dev, gpio.line, &divs, &duty);
  53                 if (ret == 0 && divs) {
  54                         divs = max(divs, duty);
  55                         if (dev_priv->card_type <= NV_40 || (gpio.log[0] & 1))
  56                                 duty = divs - duty;
  57                         return (duty * 100) / divs;
  58                 }
  59
  60                 return nouveau_gpio_func_get(dev, gpio.func) * 100;
  61         }
  62
  63         return -ENODEV;
  64 }
  65
  66 static int
  67 nouveau_pwmfan_set(struct drm_device *dev, int percent)
  68 {
  69         struct drm_nouveau_private *dev_priv = dev->dev_private;
  70         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
  71         struct gpio_func gpio;
  72         u32 divs, duty;
  73         int ret;
  74
  75         if (!pm->pwm_set)
  76                 return -ENODEV;
  77
  78         ret = nouveau_gpio_find(dev, 0, DCB_GPIO_PWM_FAN, 0xff, &gpio);
  79         if (ret == 0) {
  80                 divs = pm->fan.pwm_divisor;
  81                 if (pm->fan.pwm_freq) {
  82                         /*XXX: PNVIO clock more than likely... */
  83                         divs = 135000 / pm->fan.pwm_freq;
  84                         if (dev_priv->chipset < 0xa3)
  85                                 divs /= 4;
  86                 }
  87
  88                 duty = ((divs * percent) + 99) / 100;
  89                 if (dev_priv->card_type <= NV_40 || (gpio.log[0] & 1))
  90                         duty = divs - duty;
  91
  92                 ret = pm->pwm_set(dev, gpio.line, divs, duty);
  93                 if (!ret)
  94                         pm->fan.percent = percent;
  95                 return ret;
  96         }
  97
  98         return -ENODEV;
  99 }
 100
 101 static int
 102 nouveau_pm_perflvl_aux(struct drm_device *dev, struct nouveau_pm_level *perflvl,
 103                        struct nouveau_pm_level *a, struct nouveau_pm_level *b)
 104 {
 105         struct drm_nouveau_private *dev_priv = dev->dev_private;
 106         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 107         int ret;
 108
 109         /*XXX: not on all boards, we should control based on temperature
 110          *     on recent boards..  or maybe on some other factor we don't
 111          *     know about?
 112          */
 113         if (a->fanspeed && b->fanspeed && b->fanspeed > a->fanspeed) {
 114                 ret = nouveau_pwmfan_set(dev, perflvl->fanspeed);
 115                 if (ret && ret != -ENODEV) {
 116                         NV_ERROR(dev, "fanspeed set failed: %d\n", ret);
 117                         return ret;
 118                 }
 119         }
 120
 121         if (pm->voltage.supported && pm->voltage_set) {
 122                 if (perflvl->volt_min && b->volt_min > a->volt_min) {
 123                         ret = pm->voltage_set(dev, perflvl->volt_min);
 124                         if (ret) {
 125                                 NV_ERROR(dev, "voltage set failed: %d\n", ret);
 126                                 return ret;
 127                         }
 128                 }
 129         }
 130
 131         return 0;
 132 }
 133
 134 static int
 135 nouveau_pm_perflvl_set(struct drm_device *dev, struct nouveau_pm_level *perflvl)
 136 {
 137         struct drm_nouveau_private *dev_priv = dev->dev_private;
 138         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 139         void *state;
 140         int ret;
 141
 142         if (perflvl == pm->cur)
 143                 return 0;
 144
 145         ret = nouveau_pm_perflvl_aux(dev, perflvl, pm->cur, perflvl);
 146         if (ret)
 147                 return ret;
 148
 149         state = pm->clocks_pre(dev, perflvl);
 150         if (IS_ERR(state)) {
 151                 ret = PTR_ERR(state);
 152                 goto error;
 153         }
 154         ret = pm->clocks_set(dev, state);
 155         if (ret)
 156                 goto error;
 157
 158         ret = nouveau_pm_perflvl_aux(dev, perflvl, perflvl, pm->cur);
 159         if (ret)
 160                 return ret;
 161
 162         pm->cur = perflvl;
 163         return 0;
 164
 165 error:
 166         /* restore the fan speed and voltage before leaving */
 167         nouveau_pm_perflvl_aux(dev, perflvl, perflvl, pm->cur);
 168         return ret;
 169 }
 170
 171 void
 172 nouveau_pm_trigger(struct drm_device *dev)
 173 {
 174         struct drm_nouveau_private *dev_priv = dev->dev_private;
 175         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 176         struct nouveau_pm_profile *profile = NULL;
 177         struct nouveau_pm_level *perflvl = NULL;
 178         int ret;
 179
 180         /* select power profile based on current power source */
 181         if (power_supply_is_system_supplied())
 182                 profile = pm->profile_ac;
 183         else
 184                 profile = pm->profile_dc;
 185
 186         if (profile != pm->profile) {
 187                 pm->profile->func->fini(pm->profile);
 188                 pm->profile = profile;
 189                 pm->profile->func->init(pm->profile);
 190         }
 191
 192         /* select performance level based on profile */
 193         perflvl = profile->func->select(profile);
 194
 195         /* change perflvl, if necessary */
 196         if (perflvl != pm->cur) {
 197                 struct nouveau_timer_engine *ptimer = &dev_priv->engine.timer;
 198                 u64 time0 = ptimer->read(dev);
 199
 200                 NV_INFO(dev, "setting performance level: %d", perflvl->id);
 201                 ret = nouveau_pm_perflvl_set(dev, perflvl);
 202                 if (ret)
 203                         NV_INFO(dev, "> reclocking failed: %d\n\n", ret);
 204
 205                 NV_INFO(dev, "> reclocking took %lluns\n\n",
 206                              ptimer->read(dev) - time0);
 207         }
 208 }
 209
 210 static struct nouveau_pm_profile *
 211 profile_find(struct drm_device *dev, const char *string)
 212 {
 213         struct drm_nouveau_private *dev_priv = dev->dev_private;
 214         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 215         struct nouveau_pm_profile *profile;
 216
 217         list_for_each_entry(profile, &pm->profiles, head) {
 218                 if (!strncmp(profile->name, string, sizeof(profile->name)))
 219                         return profile;
 220         }
 221
 222         return NULL;
 223 }
 224
 225 static int
 226 nouveau_pm_profile_set(struct drm_device *dev, const char *profile)
 227 {
 228         struct drm_nouveau_private *dev_priv = dev->dev_private;
 229         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 230         struct nouveau_pm_profile *ac = NULL, *dc = NULL;
 231         char string[16], *cur = string, *ptr;
 232
 233         /* safety precaution, for now */
 234         if (nouveau_perflvl_wr != 7777)
 235                 return -EPERM;
 236
 237         strncpy(string, profile, sizeof(string));
 238         if ((ptr = strchr(string, '\n')))
 239                 *ptr = '\0';
 240
 241         ptr = strsep(&cur, ",");
 242         if (ptr)
 243                 ac = profile_find(dev, ptr);
 244
 245         ptr = strsep(&cur, ",");
 246         if (ptr)
 247                 dc = profile_find(dev, ptr);
 248         else
 249                 dc = ac;
 250
 251         if (ac == NULL || dc == NULL)
 252                 return -EINVAL;
 253
 254         pm->profile_ac = ac;
 255         pm->profile_dc = dc;
 256         nouveau_pm_trigger(dev);
 257         return 0;
 258 }
 259
 260 static void
 261 nouveau_pm_static_dummy(struct nouveau_pm_profile *profile)
 262 {
 263 }
 264
 265 static struct nouveau_pm_level *
 266 nouveau_pm_static_select(struct nouveau_pm_profile *profile)
 267 {
 268         return container_of(profile, struct nouveau_pm_level, profile);
 269 }
 270
 271 const struct nouveau_pm_profile_func nouveau_pm_static_profile_func = {
 272         .destroy = nouveau_pm_static_dummy,
 273         .init = nouveau_pm_static_dummy,
 274         .fini = nouveau_pm_static_dummy,
 275         .select = nouveau_pm_static_select,
 276 };
 277
 278 static int
 279 nouveau_pm_perflvl_get(struct drm_device *dev, struct nouveau_pm_level *perflvl)
 280 {
 281         struct drm_nouveau_private *dev_priv = dev->dev_private;
 282         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 283         int ret;
 284
 285         memset(perflvl, 0, sizeof(*perflvl));
 286
 287         ret = pm->clocks_get(dev, perflvl);
 288         if (ret)
 289                 return ret;
 290
 291         if (pm->voltage.supported && pm->voltage_get) {
 292                 ret = pm->voltage_get(dev);
 293                 if (ret > 0) {
 294                         perflvl->volt_min = ret;
 295                         perflvl->volt_max = ret;
 296                 }
 297         }
 298
 299         ret = nouveau_pwmfan_get(dev);
 300         if (ret > 0)
 301                 perflvl->fanspeed = ret;
 302
 303         nouveau_mem_timing_read(dev, &perflvl->timing);
 304         return 0;
 305 }
 306
 307 static void
 308 nouveau_pm_perflvl_info(struct nouveau_pm_level *perflvl, char *ptr, int len)
 309 {
 310         char c[16], s[16], v[32], f[16], m[16];
 311
 312         c[0] = '\0';
 313         if (perflvl->core)
 314                 snprintf(c, sizeof(c), " core %dMHz", perflvl->core / 1000);
 315
 316         s[0] = '\0';
 317         if (perflvl->shader)
 318                 snprintf(s, sizeof(s), " shader %dMHz", perflvl->shader / 1000);
 319
 320         m[0] = '\0';
 321         if (perflvl->memory)
 322                 snprintf(m, sizeof(m), " memory %dMHz", perflvl->memory / 1000);
 323
 324         v[0] = '\0';
 325         if (perflvl->volt_min && perflvl->volt_min != perflvl->volt_max) {
 326                 snprintf(v, sizeof(v), " voltage %dmV-%dmV",
 327                          perflvl->volt_min / 1000, perflvl->volt_max / 1000);
 328         } else
 329         if (perflvl->volt_min) {
 330                 snprintf(v, sizeof(v), " voltage %dmV",
 331                          perflvl->volt_min / 1000);
 332         }
 333
 334         f[0] = '\0';
 335         if (perflvl->fanspeed)
 336                 snprintf(f, sizeof(f), " fanspeed %d%%", perflvl->fanspeed);
 337
 338         snprintf(ptr, len, "%s%s%s%s%s\n", c, s, m, v, f);
 339 }
 340
 341 static ssize_t
 342 nouveau_pm_get_perflvl_info(struct device *d,
 343                             struct device_attribute *a, char *buf)
 344 {
 345         struct nouveau_pm_level *perflvl =
 346                 container_of(a, struct nouveau_pm_level, dev_attr);
 347         char *ptr = buf;
 348         int len = PAGE_SIZE;
 349
 350         snprintf(ptr, len, "%d:", perflvl->id);
 351         ptr += strlen(buf);
 352         len -= strlen(buf);
 353
 354         nouveau_pm_perflvl_info(perflvl, ptr, len);
 355         return strlen(buf);
 356 }
 357
 358 static ssize_t
 359 nouveau_pm_get_perflvl(struct device *d, struct device_attribute *a, char *buf)
 360 {
 361         struct drm_device *dev = pci_get_drvdata(to_pci_dev(d));
 362         struct drm_nouveau_private *dev_priv = dev->dev_private;
 363         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 364         struct nouveau_pm_level cur;
 365         int len = PAGE_SIZE, ret;
 366         char *ptr = buf;
 367
 368         snprintf(ptr, len, "profile: %s, %s\nc:",
 369                  pm->profile_ac->name, pm->profile_dc->name);
 370         ptr += strlen(buf);
 371         len -= strlen(buf);
 372
 373         ret = nouveau_pm_perflvl_get(dev, &cur);
 374         if (ret == 0)
 375                 nouveau_pm_perflvl_info(&cur, ptr, len);
 376         return strlen(buf);
 377 }
 378
 379 static ssize_t
 380 nouveau_pm_set_perflvl(struct device *d, struct device_attribute *a,
 381                        const char *buf, size_t count)
 382 {
 383         struct drm_device *dev = pci_get_drvdata(to_pci_dev(d));
 384         int ret;
 385
 386         ret = nouveau_pm_profile_set(dev, buf);
 387         if (ret)
 388                 return ret;
 389         return strlen(buf);
 390 }
 391
 392 static DEVICE_ATTR(performance_level, S_IRUGO | S_IWUSR,
 393                    nouveau_pm_get_perflvl, nouveau_pm_set_perflvl);
 394
 395 static int
 396 nouveau_sysfs_init(struct drm_device *dev)
 397 {
 398         struct drm_nouveau_private *dev_priv = dev->dev_private;
 399         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 400         struct device *d = &dev->pdev->dev;
 401         int ret, i;
 402
 403         ret = device_create_file(d, &dev_attr_performance_level);
 404         if (ret)
 405                 return ret;
 406
 407         for (i = 0; i < pm->nr_perflvl; i++) {
 408                 struct nouveau_pm_level *perflvl = &pm->perflvl[i];
 409
 410                 perflvl->dev_attr.attr.name = perflvl->name;
 411                 perflvl->dev_attr.attr.mode = S_IRUGO;
 412                 perflvl->dev_attr.show = nouveau_pm_get_perflvl_info;
 413                 perflvl->dev_attr.store = NULL;
 414                 sysfs_attr_init(&perflvl->dev_attr.attr);
 415
 416                 ret = device_create_file(d, &perflvl->dev_attr);
 417                 if (ret) {
 418                         NV_ERROR(dev, "failed pervlvl %d sysfs: %d\n",
 419                                  perflvl->id, i);
 420                         perflvl->dev_attr.attr.name = NULL;
 421                         nouveau_pm_fini(dev);
 422                         return ret;
 423                 }
 424         }
 425
 426         return 0;
 427 }
 428
 429 static void
 430 nouveau_sysfs_fini(struct drm_device *dev)
 431 {
 432         struct drm_nouveau_private *dev_priv = dev->dev_private;
 433         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 434         struct device *d = &dev->pdev->dev;
 435         int i;
 436
 437         device_remove_file(d, &dev_attr_performance_level);
 438         for (i = 0; i < pm->nr_perflvl; i++) {
 439                 struct nouveau_pm_level *pl = &pm->perflvl[i];
 440
 441                 if (!pl->dev_attr.attr.name)
 442                         break;
 443
 444                 device_remove_file(d, &pl->dev_attr);
 445         }
 446 }
 447
 448 #if defined(CONFIG_HWMON) || (defined(MODULE) && defined(CONFIG_HWMON_MODULE))
 449 static ssize_t
 450 nouveau_hwmon_show_temp(struct device *d, struct device_attribute *a, char *buf)
 451 {
 452         struct drm_device *dev = dev_get_drvdata(d);
 453         struct drm_nouveau_private *dev_priv = dev->dev_private;
 454         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 455
 456         return snprintf(buf, PAGE_SIZE, "%d\n", pm->temp_get(dev)*1000);
 457 }
 458 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, nouveau_hwmon_show_temp,
 459                                                   NULL, 0);
 460
 461 static ssize_t
 462 nouveau_hwmon_max_temp(struct device *d, struct device_attribute *a, char *buf)
 463 {
 464         struct drm_device *dev = dev_get_drvdata(d);
 465         struct drm_nouveau_private *dev_priv = dev->dev_private;
 466         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 467         struct nouveau_pm_threshold_temp *temp = &pm->threshold_temp;
 468
 469         return snprintf(buf, PAGE_SIZE, "%d\n", temp->down_clock*1000);
 470 }
 471 static ssize_t
 472 nouveau_hwmon_set_max_temp(struct device *d, struct device_attribute *a,
 473                                                 const char *buf, size_t count)
 474 {
 475         struct drm_device *dev = dev_get_drvdata(d);
 476         struct drm_nouveau_private *dev_priv = dev->dev_private;
 477         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 478         struct nouveau_pm_threshold_temp *temp = &pm->threshold_temp;
 479         long value;
 480
 481         if (kstrtol(buf, 10, &value) == -EINVAL)
 482                 return count;
 483
 484         temp->down_clock = value/1000;
 485
 486         nouveau_temp_safety_checks(dev);
 487
 488         return count;
 489 }
 490 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, nouveau_hwmon_max_temp,
 491                                                   nouveau_hwmon_set_max_temp,
 492                                                   0);
 493
 494 static ssize_t
 495 nouveau_hwmon_critical_temp(struct device *d, struct device_attribute *a,
 496                                                         char *buf)
 497 {
 498         struct drm_device *dev = dev_get_drvdata(d);
 499         struct drm_nouveau_private *dev_priv = dev->dev_private;
 500         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 501         struct nouveau_pm_threshold_temp *temp = &pm->threshold_temp;
 502
 503         return snprintf(buf, PAGE_SIZE, "%d\n", temp->critical*1000);
 504 }
 505 static ssize_t
 506 nouveau_hwmon_set_critical_temp(struct device *d, struct device_attribute *a,
 507                                                             const char *buf,
 508                                                                 size_t count)
 509 {
 510         struct drm_device *dev = dev_get_drvdata(d);
 511         struct drm_nouveau_private *dev_priv = dev->dev_private;
 512         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 513         struct nouveau_pm_threshold_temp *temp = &pm->threshold_temp;
 514         long value;
 515
 516         if (kstrtol(buf, 10, &value) == -EINVAL)
 517                 return count;
 518
 519         temp->critical = value/1000;
 520
 521         nouveau_temp_safety_checks(dev);
 522
 523         return count;
 524 }
 525 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR,
 526                                                 nouveau_hwmon_critical_temp,
 527                                                 nouveau_hwmon_set_critical_temp,
 528                                                 0);
 529
 530 static ssize_t nouveau_hwmon_show_name(struct device *dev,
 531                                       struct device_attribute *attr,
 532                                       char *buf)
 533 {
 534         return sprintf(buf, "nouveau\n");
 535 }
 536 static SENSOR_DEVICE_ATTR(name, S_IRUGO, nouveau_hwmon_show_name, NULL, 0);
 537
 538 static ssize_t nouveau_hwmon_show_update_rate(struct device *dev,
 539                                       struct device_attribute *attr,
 540                                       char *buf)
 541 {
 542         return sprintf(buf, "1000\n");
 543 }
 544 static SENSOR_DEVICE_ATTR(update_rate, S_IRUGO,
 545                                                 nouveau_hwmon_show_update_rate,
 546                                                 NULL, 0);
 547
 548 static ssize_t
 549 nouveau_hwmon_show_fan0_input(struct device *d, struct device_attribute *attr,
 550                               char *buf)
 551 {
 552         struct drm_device *dev = dev_get_drvdata(d);
 553         struct drm_nouveau_private *dev_priv = dev->dev_private;
 554         struct nouveau_timer_engine *ptimer = &dev_priv->engine.timer;
 555         struct gpio_func gpio;
 556         u32 cycles, cur, prev;
 557         u64 start;
 558         int ret;
 559
 560         ret = nouveau_gpio_find(dev, 0, DCB_GPIO_FAN_SENSE, 0xff, &gpio);
 561         if (ret)
 562                 return ret;
 563
 564         /* Monitor the GPIO input 0x3b for 250ms.
 565          * When the fan spins, it changes the value of GPIO FAN_SENSE.
 566          * We get 4 changes (0 -> 1 -> 0 -> 1 -> [...]) per complete rotation.
 567          */
 568         start = ptimer->read(dev);
 569         prev = nouveau_gpio_sense(dev, 0, gpio.line);
 570         cycles = 0;
 571         do {
 572                 cur = nouveau_gpio_sense(dev, 0, gpio.line);
 573                 if (prev != cur) {
 574                         cycles++;
 575                         prev = cur;
 576                 }
 577
 578                 usleep_range(500, 1000); /* supports 0 < rpm < 7500 */
 579         } while (ptimer->read(dev) - start < 250000000);
 580
 581         /* interpolate to get rpm */
 582         return sprintf(buf, "%i\n", cycles / 4 * 4 * 60);
 583 }
 584 static SENSOR_DEVICE_ATTR(fan0_input, S_IRUGO, nouveau_hwmon_show_fan0_input,
 585                           NULL, 0);
 586
 587 static ssize_t
 588 nouveau_hwmon_get_pwm0(struct device *d, struct device_attribute *a, char *buf)
 589 {
 590         struct drm_device *dev = dev_get_drvdata(d);
 591         int ret;
 592
 593         ret = nouveau_pwmfan_get(dev);
 594         if (ret < 0)
 595                 return ret;
 596
 597         return sprintf(buf, "%i\n", ret);
 598 }
 599
 600 static ssize_t
 601 nouveau_hwmon_set_pwm0(struct device *d, struct device_attribute *a,
 602                        const char *buf, size_t count)
 603 {
 604         struct drm_device *dev = dev_get_drvdata(d);
 605         struct drm_nouveau_private *dev_priv = dev->dev_private;
 606         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 607         int ret = -ENODEV;
 608         long value;
 609
 610         if (nouveau_perflvl_wr != 7777)
 611                 return -EPERM;
 612
 613         if (kstrtol(buf, 10, &value) == -EINVAL)
 614                 return -EINVAL;
 615
 616         if (value < pm->fan.min_duty)
 617                 value = pm->fan.min_duty;
 618         if (value > pm->fan.max_duty)
 619                 value = pm->fan.max_duty;
 620
 621         ret = nouveau_pwmfan_set(dev, value);
 622         if (ret)
 623                 return ret;
 624
 625         return count;
 626 }
 627
 628 static SENSOR_DEVICE_ATTR(pwm0, S_IRUGO | S_IWUSR,
 629                           nouveau_hwmon_get_pwm0,
 630                           nouveau_hwmon_set_pwm0, 0);
 631
 632 static ssize_t
 633 nouveau_hwmon_get_pwm0_min(struct device *d,
 634                            struct device_attribute *a, char *buf)
 635 {
 636         struct drm_device *dev = dev_get_drvdata(d);
 637         struct drm_nouveau_private *dev_priv = dev->dev_private;
 638         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 639
 640         return sprintf(buf, "%i\n", pm->fan.min_duty);
 641 }
 642
 643 static ssize_t
 644 nouveau_hwmon_set_pwm0_min(struct device *d, struct device_attribute *a,
 645                            const char *buf, size_t count)
 646 {
 647         struct drm_device *dev = dev_get_drvdata(d);
 648         struct drm_nouveau_private *dev_priv = dev->dev_private;
 649         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 650         long value;
 651
 652         if (kstrtol(buf, 10, &value) == -EINVAL)
 653                 return -EINVAL;
 654
 655         if (value < 0)
 656                 value = 0;
 657
 658         if (pm->fan.max_duty - value < 10)
 659                 value = pm->fan.max_duty - 10;
 660
 661         if (value < 10)
 662                 pm->fan.min_duty = 10;
 663         else
 664                 pm->fan.min_duty = value;
 665
 666         return count;
 667 }
 668
 669 static SENSOR_DEVICE_ATTR(pwm0_min, S_IRUGO | S_IWUSR,
 670                           nouveau_hwmon_get_pwm0_min,
 671                           nouveau_hwmon_set_pwm0_min, 0);
 672
 673 static ssize_t
 674 nouveau_hwmon_get_pwm0_max(struct device *d,
 675                            struct device_attribute *a, char *buf)
 676 {
 677         struct drm_device *dev = dev_get_drvdata(d);
 678         struct drm_nouveau_private *dev_priv = dev->dev_private;
 679         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 680
 681         return sprintf(buf, "%i\n", pm->fan.max_duty);
 682 }
 683
 684 static ssize_t
 685 nouveau_hwmon_set_pwm0_max(struct device *d, struct device_attribute *a,
 686                            const char *buf, size_t count)
 687 {
 688         struct drm_device *dev = dev_get_drvdata(d);
 689         struct drm_nouveau_private *dev_priv = dev->dev_private;
 690         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 691         long value;
 692
 693         if (kstrtol(buf, 10, &value) == -EINVAL)
 694                 return -EINVAL;
 695
 696         if (value < 0)
 697                 value = 0;
 698
 699         if (value - pm->fan.min_duty < 10)
 700                 value = pm->fan.min_duty + 10;
 701
 702         if (value > 100)
 703                 pm->fan.max_duty = 100;
 704         else
 705                 pm->fan.max_duty = value;
 706
 707         return count;
 708 }
 709
 710 static SENSOR_DEVICE_ATTR(pwm0_max, S_IRUGO | S_IWUSR,
 711                           nouveau_hwmon_get_pwm0_max,
 712                           nouveau_hwmon_set_pwm0_max, 0);
 713
 714 static struct attribute *hwmon_attributes[] = {
 715         &sensor_dev_attr_temp1_input.dev_attr.attr,
 716         &sensor_dev_attr_temp1_max.dev_attr.attr,
 717         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 718         &sensor_dev_attr_name.dev_attr.attr,
 719         &sensor_dev_attr_update_rate.dev_attr.attr,
 720         NULL
 721 };
 722 static struct attribute *hwmon_fan_rpm_attributes[] = {
 723         &sensor_dev_attr_fan0_input.dev_attr.attr,
 724         NULL
 725 };
 726 static struct attribute *hwmon_pwm_fan_attributes[] = {
 727         &sensor_dev_attr_pwm0.dev_attr.attr,
 728         &sensor_dev_attr_pwm0_min.dev_attr.attr,
 729         &sensor_dev_attr_pwm0_max.dev_attr.attr,
 730         NULL
 731 };
 732
 733 static const struct attribute_group hwmon_attrgroup = {
 734         .attrs = hwmon_attributes,
 735 };
 736 static const struct attribute_group hwmon_fan_rpm_attrgroup = {
 737         .attrs = hwmon_fan_rpm_attributes,
 738 };
 739 static const struct attribute_group hwmon_pwm_fan_attrgroup = {
 740         .attrs = hwmon_pwm_fan_attributes,
 741 };
 742 #endif
 743
 744 static int
 745 nouveau_hwmon_init(struct drm_device *dev)
 746 {
 747         struct drm_nouveau_private *dev_priv = dev->dev_private;
 748         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 749 #if defined(CONFIG_HWMON) || (defined(MODULE) && defined(CONFIG_HWMON_MODULE))
 750         struct device *hwmon_dev;
 751         int ret = 0;
 752
 753         if (!pm->temp_get)
 754                 return -ENODEV;
 755
 756         hwmon_dev = hwmon_device_register(&dev->pdev->dev);
 757         if (IS_ERR(hwmon_dev)) {
 758                 ret = PTR_ERR(hwmon_dev);
 759                 NV_ERROR(dev,
 760                         "Unable to register hwmon device: %d\n", ret);
 761                 return ret;
 762         }
 763         dev_set_drvdata(hwmon_dev, dev);
 764
 765         /* default sysfs entries */
 766         ret = sysfs_create_group(&dev->pdev->dev.kobj, &hwmon_attrgroup);
 767         if (ret) {
 768                 if (ret)
 769                         goto error;
 770         }
 771
 772         /* if the card has a pwm fan */
 773         /*XXX: incorrect, need better detection for this, some boards have
 774          *     the gpio entries for pwm fan control even when there's no
 775          *     actual fan connected to it... therm table? */
 776         if (nouveau_pwmfan_get(dev) >= 0) {
 777                 ret = sysfs_create_group(&dev->pdev->dev.kobj,
 778                                          &hwmon_pwm_fan_attrgroup);
 779                 if (ret)
 780                         goto error;
 781         }
 782
 783         /* if the card can read the fan rpm */
 784         if (nouveau_gpio_func_valid(dev, DCB_GPIO_FAN_SENSE)) {
 785                 ret = sysfs_create_group(&dev->pdev->dev.kobj,
 786                                          &hwmon_fan_rpm_attrgroup);
 787                 if (ret)
 788                         goto error;
 789         }
 790
 791         pm->hwmon = hwmon_dev;
 792
 793         return 0;
 794
 795 error:
 796         NV_ERROR(dev, "Unable to create some hwmon sysfs files: %d\n", ret);
 797         hwmon_device_unregister(hwmon_dev);
 798         pm->hwmon = NULL;
 799         return ret;
 800 #else
 801         pm->hwmon = NULL;
 802         return 0;
 803 #endif
 804 }
 805
 806 static void
 807 nouveau_hwmon_fini(struct drm_device *dev)
 808 {
 809 #if defined(CONFIG_HWMON) || (defined(MODULE) && defined(CONFIG_HWMON_MODULE))
 810         struct drm_nouveau_private *dev_priv = dev->dev_private;
 811         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 812
 813         if (pm->hwmon) {
 814                 sysfs_remove_group(&dev->pdev->dev.kobj, &hwmon_attrgroup);
 815                 sysfs_remove_group(&dev->pdev->dev.kobj,
 816                                    &hwmon_pwm_fan_attrgroup);
 817                 sysfs_remove_group(&dev->pdev->dev.kobj,
 818                                    &hwmon_fan_rpm_attrgroup);
 819
 820                 hwmon_device_unregister(pm->hwmon);
 821         }
 822 #endif
 823 }
 824
 825 #if defined(CONFIG_ACPI) && defined(CONFIG_POWER_SUPPLY)
 826 static int
 827 nouveau_pm_acpi_event(struct notifier_block *nb, unsigned long val, void *data)
 828 {
 829         struct drm_nouveau_private *dev_priv =
 830                 container_of(nb, struct drm_nouveau_private, engine.pm.acpi_nb);
 831         struct drm_device *dev = dev_priv->dev;
 832         struct acpi_bus_event *entry = (struct acpi_bus_event *)data;
 833
 834         if (strcmp(entry->device_class, "ac_adapter") == 0) {
 835                 bool ac = power_supply_is_system_supplied();
 836
 837                 NV_DEBUG(dev, "power supply changed: %s\n", ac ? "AC" : "DC");
 838                 nouveau_pm_trigger(dev);
 839         }
 840
 841         return NOTIFY_OK;
 842 }
 843 #endif
 844
 845 int
 846 nouveau_pm_init(struct drm_device *dev)
 847 {
 848         struct drm_nouveau_private *dev_priv = dev->dev_private;
 849         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 850         char info[256];
 851         int ret, i;
 852
 853         /* parse aux tables from vbios */
 854         nouveau_volt_init(dev);
 855         nouveau_temp_init(dev);
 856
 857         /* determine current ("boot") performance level */
 858         ret = nouveau_pm_perflvl_get(dev, &pm->boot);
 859         if (ret) {
 860                 NV_ERROR(dev, "failed to determine boot perflvl\n");
 861                 return ret;
 862         }
 863
 864         strncpy(pm->boot.name, "boot", 4);
 865         strncpy(pm->boot.profile.name, "boot", 4);
 866         pm->boot.profile.func = &nouveau_pm_static_profile_func;
 867
 868         INIT_LIST_HEAD(&pm->profiles);
 869         list_add(&pm->boot.profile.head, &pm->profiles);
 870
 871         pm->profile_ac = &pm->boot.profile;
 872         pm->profile_dc = &pm->boot.profile;
 873         pm->profile = &pm->boot.profile;
 874         pm->cur = &pm->boot;
 875
 876         /* add performance levels from vbios */
 877         nouveau_perf_init(dev);
 878
 879         /* display available performance levels */
 880         NV_INFO(dev, "%d available performance level(s)\n", pm->nr_perflvl);
 881         for (i = 0; i < pm->nr_perflvl; i++) {
 882                 nouveau_pm_perflvl_info(&pm->perflvl[i], info, sizeof(info));
 883                 NV_INFO(dev, "%d:%s", pm->perflvl[i].id, info);
 884         }
 885
 886         nouveau_pm_perflvl_info(&pm->boot, info, sizeof(info));
 887         NV_INFO(dev, "c:%s", info);
 888
 889         /* switch performance levels now if requested */
 890         if (nouveau_perflvl != NULL)
 891                 nouveau_pm_profile_set(dev, nouveau_perflvl);
 892
 893         /* determine the current fan speed */
 894         pm->fan.percent = nouveau_pwmfan_get(dev);
 895
 896         nouveau_sysfs_init(dev);
 897         nouveau_hwmon_init(dev);
 898 #if defined(CONFIG_ACPI) && defined(CONFIG_POWER_SUPPLY)
 899         pm->acpi_nb.notifier_call = nouveau_pm_acpi_event;
 900         register_acpi_notifier(&pm->acpi_nb);
 901 #endif
 902
 903         return 0;
 904 }
 905
 906 void
 907 nouveau_pm_fini(struct drm_device *dev)
 908 {
 909         struct drm_nouveau_private *dev_priv = dev->dev_private;
 910         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 911         struct nouveau_pm_profile *profile, *tmp;
 912
 913         list_for_each_entry_safe(profile, tmp, &pm->profiles, head) {
 914                 list_del(&profile->head);
 915                 profile->func->destroy(profile);
 916         }
 917
 918         if (pm->cur != &pm->boot)
 919                 nouveau_pm_perflvl_set(dev, &pm->boot);
 920
 921         nouveau_temp_fini(dev);
 922         nouveau_perf_fini(dev);
 923         nouveau_volt_fini(dev);
 924
 925 #if defined(CONFIG_ACPI) && defined(CONFIG_POWER_SUPPLY)
 926         unregister_acpi_notifier(&pm->acpi_nb);
 927 #endif
 928         nouveau_hwmon_fini(dev);
 929         nouveau_sysfs_fini(dev);
 930 }
 931
 932 void
 933 nouveau_pm_resume(struct drm_device *dev)
 934 {
 935         struct drm_nouveau_private *dev_priv = dev->dev_private;
 936         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 937         struct nouveau_pm_level *perflvl;
 938
 939         if (!pm->cur || pm->cur == &pm->boot)
 940                 return;
 941
 942         perflvl = pm->cur;
 943         pm->cur = &pm->boot;
 944         nouveau_pm_perflvl_set(dev, perflvl);
 945         nouveau_pwmfan_set(dev, pm->fan.percent);
 946 }