drivers/gpu/drm/i915/intel_runtime_pm.c

   1 /*
   2  * Copyright © 2012-2014 Intel Corporation
   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 (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eugeni Dodonov <eugeni.dodonov@intel.com>
  25  *    Daniel Vetter <daniel.vetter@ffwll.ch>
  26  *
  27  */
  28
  29 #include <linux/pm_runtime.h>
  30
  31 #include <drm/drm_print.h>
  32
  33 #include "i915_drv.h"
  34 #include "i915_trace.h"
  35
  36 /**
  37  * DOC: runtime pm
  38  *
  39  * The i915 driver supports dynamic enabling and disabling of entire hardware
  40  * blocks at runtime. This is especially important on the display side where
  41  * software is supposed to control many power gates manually on recent hardware,
  42  * since on the GT side a lot of the power management is done by the hardware.
  43  * But even there some manual control at the device level is required.
  44  *
  45  * Since i915 supports a diverse set of platforms with a unified codebase and
  46  * hardware engineers just love to shuffle functionality around between power
  47  * domains there's a sizeable amount of indirection required. This file provides
  48  * generic functions to the driver for grabbing and releasing references for
  49  * abstract power domains. It then maps those to the actual power wells
  50  * present for a given platform.
  51  */
  52
  53 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM)
  54
  55 #include <linux/sort.h>
  56
  57 #define STACKDEPTH 8
  58
  59 static noinline depot_stack_handle_t __save_depot_stack(void)
  60 {
  61         unsigned long entries[STACKDEPTH];
  62         unsigned int n;
  63
  64         n = stack_trace_save(entries, ARRAY_SIZE(entries), 1);
  65         return stack_depot_save(entries, n, GFP_NOWAIT | __GFP_NOWARN);
  66 }
  67
  68 static void __print_depot_stack(depot_stack_handle_t stack,
  69                                 char *buf, int sz, int indent)
  70 {
  71         unsigned long *entries;
  72         unsigned int nr_entries;
  73
  74         nr_entries = stack_depot_fetch(stack, &entries);
  75         stack_trace_snprint(buf, sz, entries, nr_entries, indent);
  76 }
  77
  78 static void init_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm)
  79 {
  80         spin_lock_init(&rpm->debug.lock);
  81 }
  82
  83 static noinline depot_stack_handle_t
  84 track_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm)
  85 {
  86         depot_stack_handle_t stack, *stacks;
  87         unsigned long flags;
  88
  89         if (!rpm->available)
  90                 return -1;
  91
  92         stack = __save_depot_stack();
  93         if (!stack)
  94                 return -1;
  95
  96         spin_lock_irqsave(&rpm->debug.lock, flags);
  97
  98         if (!rpm->debug.count)
  99                 rpm->debug.last_acquire = stack;
 100
 101         stacks = krealloc(rpm->debug.owners,
 102                           (rpm->debug.count + 1) * sizeof(*stacks),
 103                           GFP_NOWAIT | __GFP_NOWARN);
 104         if (stacks) {
 105                 stacks[rpm->debug.count++] = stack;
 106                 rpm->debug.owners = stacks;
 107         } else {
 108                 stack = -1;
 109         }
 110
 111         spin_unlock_irqrestore(&rpm->debug.lock, flags);
 112
 113         return stack;
 114 }
 115
 116 static void untrack_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm,
 117                                              depot_stack_handle_t stack)
 118 {
 119         struct drm_i915_private *i915 = container_of(rpm,
 120                                                      struct drm_i915_private,
 121                                                      runtime_pm);
 122         unsigned long flags, n;
 123         bool found = false;
 124
 125         if (unlikely(stack == -1))
 126                 return;
 127
 128         spin_lock_irqsave(&rpm->debug.lock, flags);
 129         for (n = rpm->debug.count; n--; ) {
 130                 if (rpm->debug.owners[n] == stack) {
 131                         memmove(rpm->debug.owners + n,
 132                                 rpm->debug.owners + n + 1,
 133                                 (--rpm->debug.count - n) * sizeof(stack));
 134                         found = true;
 135                         break;
 136                 }
 137         }
 138         spin_unlock_irqrestore(&rpm->debug.lock, flags);
 139
 140         if (drm_WARN(&i915->drm, !found,
 141                      "Unmatched wakeref (tracking %lu), count %u\n",
 142                      rpm->debug.count, atomic_read(&rpm->wakeref_count))) {
 143                 char *buf;
 144
 145                 buf = kmalloc(PAGE_SIZE, GFP_NOWAIT | __GFP_NOWARN);
 146                 if (!buf)
 147                         return;
 148
 149                 __print_depot_stack(stack, buf, PAGE_SIZE, 2);
 150                 DRM_DEBUG_DRIVER("wakeref %x from\n%s", stack, buf);
 151
 152                 stack = READ_ONCE(rpm->debug.last_release);
 153                 if (stack) {
 154                         __print_depot_stack(stack, buf, PAGE_SIZE, 2);
 155                         DRM_DEBUG_DRIVER("wakeref last released at\n%s", buf);
 156                 }
 157
 158                 kfree(buf);
 159         }
 160 }
 161
 162 static int cmphandle(const void *_a, const void *_b)
 163 {
 164         const depot_stack_handle_t * const a = _a, * const b = _b;
 165
 166         if (*a < *b)
 167                 return -1;
 168         else if (*a > *b)
 169                 return 1;
 170         else
 171                 return 0;
 172 }
 173
 174 static void
 175 __print_intel_runtime_pm_wakeref(struct drm_printer *p,
 176                                  const struct intel_runtime_pm_debug *dbg)
 177 {
 178         unsigned long i;
 179         char *buf;
 180
 181         buf = kmalloc(PAGE_SIZE, GFP_NOWAIT | __GFP_NOWARN);
 182         if (!buf)
 183                 return;
 184
 185         if (dbg->last_acquire) {
 186                 __print_depot_stack(dbg->last_acquire, buf, PAGE_SIZE, 2);
 187                 drm_printf(p, "Wakeref last acquired:\n%s", buf);
 188         }
 189
 190         if (dbg->last_release) {
 191                 __print_depot_stack(dbg->last_release, buf, PAGE_SIZE, 2);
 192                 drm_printf(p, "Wakeref last released:\n%s", buf);
 193         }
 194
 195         drm_printf(p, "Wakeref count: %lu\n", dbg->count);
 196
 197         sort(dbg->owners, dbg->count, sizeof(*dbg->owners), cmphandle, NULL);
 198
 199         for (i = 0; i < dbg->count; i++) {
 200                 depot_stack_handle_t stack = dbg->owners[i];
 201                 unsigned long rep;
 202
 203                 rep = 1;
 204                 while (i + 1 < dbg->count && dbg->owners[i + 1] == stack)
 205                         rep++, i++;
 206                 __print_depot_stack(stack, buf, PAGE_SIZE, 2);
 207                 drm_printf(p, "Wakeref x%lu taken at:\n%s", rep, buf);
 208         }
 209
 210         kfree(buf);
 211 }
 212
 213 static noinline void
 214 __untrack_all_wakerefs(struct intel_runtime_pm_debug *debug,
 215                        struct intel_runtime_pm_debug *saved)
 216 {
 217         *saved = *debug;
 218
 219         debug->owners = NULL;
 220         debug->count = 0;
 221         debug->last_release = __save_depot_stack();
 222 }
 223
 224 static void
 225 dump_and_free_wakeref_tracking(struct intel_runtime_pm_debug *debug)
 226 {
 227         if (debug->count) {
 228                 struct drm_printer p = drm_debug_printer("i915");
 229
 230                 __print_intel_runtime_pm_wakeref(&p, debug);
 231         }
 232
 233         kfree(debug->owners);
 234 }
 235
 236 static noinline void
 237 __intel_wakeref_dec_and_check_tracking(struct intel_runtime_pm *rpm)
 238 {
 239         struct intel_runtime_pm_debug dbg = {};
 240         unsigned long flags;
 241
 242         if (!atomic_dec_and_lock_irqsave(&rpm->wakeref_count,
 243                                          &rpm->debug.lock,
 244                                          flags))
 245                 return;
 246
 247         __untrack_all_wakerefs(&rpm->debug, &dbg);
 248         spin_unlock_irqrestore(&rpm->debug.lock, flags);
 249
 250         dump_and_free_wakeref_tracking(&dbg);
 251 }
 252
 253 static noinline void
 254 untrack_all_intel_runtime_pm_wakerefs(struct intel_runtime_pm *rpm)
 255 {
 256         struct intel_runtime_pm_debug dbg = {};
 257         unsigned long flags;
 258
 259         spin_lock_irqsave(&rpm->debug.lock, flags);
 260         __untrack_all_wakerefs(&rpm->debug, &dbg);
 261         spin_unlock_irqrestore(&rpm->debug.lock, flags);
 262
 263         dump_and_free_wakeref_tracking(&dbg);
 264 }
 265
 266 void print_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm,
 267                                     struct drm_printer *p)
 268 {
 269         struct intel_runtime_pm_debug dbg = {};
 270
 271         do {
 272                 unsigned long alloc = dbg.count;
 273                 depot_stack_handle_t *s;
 274
 275                 spin_lock_irq(&rpm->debug.lock);
 276                 dbg.count = rpm->debug.count;
 277                 if (dbg.count <= alloc) {
 278                         memcpy(dbg.owners,
 279                                rpm->debug.owners,
 280                                dbg.count * sizeof(*s));
 281                 }
 282                 dbg.last_acquire = rpm->debug.last_acquire;
 283                 dbg.last_release = rpm->debug.last_release;
 284                 spin_unlock_irq(&rpm->debug.lock);
 285                 if (dbg.count <= alloc)
 286                         break;
 287
 288                 s = krealloc(dbg.owners,
 289                              dbg.count * sizeof(*s),
 290                              GFP_NOWAIT | __GFP_NOWARN);
 291                 if (!s)
 292                         goto out;
 293
 294                 dbg.owners = s;
 295         } while (1);
 296
 297         __print_intel_runtime_pm_wakeref(p, &dbg);
 298
 299 out:
 300         kfree(dbg.owners);
 301 }
 302
 303 #else
 304
 305 static void init_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm)
 306 {
 307 }
 308
 309 static depot_stack_handle_t
 310 track_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm)
 311 {
 312         return -1;
 313 }
 314
 315 static void untrack_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm,
 316                                              intel_wakeref_t wref)
 317 {
 318 }
 319
 320 static void
 321 __intel_wakeref_dec_and_check_tracking(struct intel_runtime_pm *rpm)
 322 {
 323         atomic_dec(&rpm->wakeref_count);
 324 }
 325
 326 static void
 327 untrack_all_intel_runtime_pm_wakerefs(struct intel_runtime_pm *rpm)
 328 {
 329 }
 330
 331 #endif
 332
 333 static void
 334 intel_runtime_pm_acquire(struct intel_runtime_pm *rpm, bool wakelock)
 335 {
 336         if (wakelock) {
 337                 atomic_add(1 + INTEL_RPM_WAKELOCK_BIAS, &rpm->wakeref_count);
 338                 assert_rpm_wakelock_held(rpm);
 339         } else {
 340                 atomic_inc(&rpm->wakeref_count);
 341                 assert_rpm_raw_wakeref_held(rpm);
 342         }
 343 }
 344
 345 static void
 346 intel_runtime_pm_release(struct intel_runtime_pm *rpm, int wakelock)
 347 {
 348         if (wakelock) {
 349                 assert_rpm_wakelock_held(rpm);
 350                 atomic_sub(INTEL_RPM_WAKELOCK_BIAS, &rpm->wakeref_count);
 351         } else {
 352                 assert_rpm_raw_wakeref_held(rpm);
 353         }
 354
 355         __intel_wakeref_dec_and_check_tracking(rpm);
 356 }
 357
 358 static intel_wakeref_t __intel_runtime_pm_get(struct intel_runtime_pm *rpm,
 359                                               bool wakelock)
 360 {
 361         struct drm_i915_private *i915 = container_of(rpm,
 362                                                      struct drm_i915_private,
 363                                                      runtime_pm);
 364         int ret;
 365
 366         ret = pm_runtime_get_sync(rpm->kdev);
 367         drm_WARN_ONCE(&i915->drm, ret < 0,
 368                       "pm_runtime_get_sync() failed: %d\n", ret);
 369
 370         intel_runtime_pm_acquire(rpm, wakelock);
 371
 372         return track_intel_runtime_pm_wakeref(rpm);
 373 }
 374
 375 /**
 376  * intel_runtime_pm_get_raw - grab a raw runtime pm reference
 377  * @rpm: the intel_runtime_pm structure
 378  *
 379  * This is the unlocked version of intel_display_power_is_enabled() and should
 380  * only be used from error capture and recovery code where deadlocks are
 381  * possible.
 382  * This function grabs a device-level runtime pm reference (mostly used for
 383  * asynchronous PM management from display code) and ensures that it is powered
 384  * up. Raw references are not considered during wakelock assert checks.
 385  *
 386  * Any runtime pm reference obtained by this function must have a symmetric
 387  * call to intel_runtime_pm_put_raw() to release the reference again.
 388  *
 389  * Returns: the wakeref cookie to pass to intel_runtime_pm_put_raw(), evaluates
 390  * as True if the wakeref was acquired, or False otherwise.
 391  */
 392 intel_wakeref_t intel_runtime_pm_get_raw(struct intel_runtime_pm *rpm)
 393 {
 394         return __intel_runtime_pm_get(rpm, false);
 395 }
 396
 397 /**
 398  * intel_runtime_pm_get - grab a runtime pm reference
 399  * @rpm: the intel_runtime_pm structure
 400  *
 401  * This function grabs a device-level runtime pm reference (mostly used for GEM
 402  * code to ensure the GTT or GT is on) and ensures that it is powered up.
 403  *
 404  * Any runtime pm reference obtained by this function must have a symmetric
 405  * call to intel_runtime_pm_put() to release the reference again.
 406  *
 407  * Returns: the wakeref cookie to pass to intel_runtime_pm_put()
 408  */
 409 intel_wakeref_t intel_runtime_pm_get(struct intel_runtime_pm *rpm)
 410 {
 411         return __intel_runtime_pm_get(rpm, true);
 412 }
 413
 414 /**
 415  * __intel_runtime_pm_get_if_active - grab a runtime pm reference if device is active
 416  * @rpm: the intel_runtime_pm structure
 417  * @ignore_usecount: get a ref even if dev->power.usage_count is 0
 418  *
 419  * This function grabs a device-level runtime pm reference if the device is
 420  * already active and ensures that it is powered up. It is illegal to try
 421  * and access the HW should intel_runtime_pm_get_if_active() report failure.
 422  *
 423  * If @ignore_usecount is true, a reference will be acquired even if there is no
 424  * user requiring the device to be powered up (dev->power.usage_count == 0).
 425  * If the function returns false in this case then it's guaranteed that the
 426  * device's runtime suspend hook has been called already or that it will be
 427  * called (and hence it's also guaranteed that the device's runtime resume
 428  * hook will be called eventually).
 429  *
 430  * Any runtime pm reference obtained by this function must have a symmetric
 431  * call to intel_runtime_pm_put() to release the reference again.
 432  *
 433  * Returns: the wakeref cookie to pass to intel_runtime_pm_put(), evaluates
 434  * as True if the wakeref was acquired, or False otherwise.
 435  */
 436 static intel_wakeref_t __intel_runtime_pm_get_if_active(struct intel_runtime_pm *rpm,
 437                                                         bool ignore_usecount)
 438 {
 439         if (IS_ENABLED(CONFIG_PM)) {
 440                 /*
 441                  * In cases runtime PM is disabled by the RPM core and we get
 442                  * an -EINVAL return value we are not supposed to call this
 443                  * function, since the power state is undefined. This applies
 444                  * atm to the late/early system suspend/resume handlers.
 445                  */
 446                 if (pm_runtime_get_if_active(rpm->kdev, ignore_usecount) <= 0)
 447                         return 0;
 448         }
 449
 450         intel_runtime_pm_acquire(rpm, true);
 451
 452         return track_intel_runtime_pm_wakeref(rpm);
 453 }
 454
 455 intel_wakeref_t intel_runtime_pm_get_if_in_use(struct intel_runtime_pm *rpm)
 456 {
 457         return __intel_runtime_pm_get_if_active(rpm, false);
 458 }
 459
 460 intel_wakeref_t intel_runtime_pm_get_if_active(struct intel_runtime_pm *rpm)
 461 {
 462         return __intel_runtime_pm_get_if_active(rpm, true);
 463 }
 464
 465 /**
 466  * intel_runtime_pm_get_noresume - grab a runtime pm reference
 467  * @rpm: the intel_runtime_pm structure
 468  *
 469  * This function grabs a device-level runtime pm reference (mostly used for GEM
 470  * code to ensure the GTT or GT is on).
 471  *
 472  * It will _not_ power up the device but instead only check that it's powered
 473  * on.  Therefore it is only valid to call this functions from contexts where
 474  * the device is known to be powered up and where trying to power it up would
 475  * result in hilarity and deadlocks. That pretty much means only the system
 476  * suspend/resume code where this is used to grab runtime pm references for
 477  * delayed setup down in work items.
 478  *
 479  * Any runtime pm reference obtained by this function must have a symmetric
 480  * call to intel_runtime_pm_put() to release the reference again.
 481  *
 482  * Returns: the wakeref cookie to pass to intel_runtime_pm_put()
 483  */
 484 intel_wakeref_t intel_runtime_pm_get_noresume(struct intel_runtime_pm *rpm)
 485 {
 486         assert_rpm_wakelock_held(rpm);
 487         pm_runtime_get_noresume(rpm->kdev);
 488
 489         intel_runtime_pm_acquire(rpm, true);
 490
 491         return track_intel_runtime_pm_wakeref(rpm);
 492 }
 493
 494 static void __intel_runtime_pm_put(struct intel_runtime_pm *rpm,
 495                                    intel_wakeref_t wref,
 496                                    bool wakelock)
 497 {
 498         struct device *kdev = rpm->kdev;
 499
 500         untrack_intel_runtime_pm_wakeref(rpm, wref);
 501
 502         intel_runtime_pm_release(rpm, wakelock);
 503
 504         pm_runtime_mark_last_busy(kdev);
 505         pm_runtime_put_autosuspend(kdev);
 506 }
 507
 508 /**
 509  * intel_runtime_pm_put_raw - release a raw runtime pm reference
 510  * @rpm: the intel_runtime_pm structure
 511  * @wref: wakeref acquired for the reference that is being released
 512  *
 513  * This function drops the device-level runtime pm reference obtained by
 514  * intel_runtime_pm_get_raw() and might power down the corresponding
 515  * hardware block right away if this is the last reference.
 516  */
 517 void
 518 intel_runtime_pm_put_raw(struct intel_runtime_pm *rpm, intel_wakeref_t wref)
 519 {
 520         __intel_runtime_pm_put(rpm, wref, false);
 521 }
 522
 523 /**
 524  * intel_runtime_pm_put_unchecked - release an unchecked runtime pm reference
 525  * @rpm: the intel_runtime_pm structure
 526  *
 527  * This function drops the device-level runtime pm reference obtained by
 528  * intel_runtime_pm_get() and might power down the corresponding
 529  * hardware block right away if this is the last reference.
 530  *
 531  * This function exists only for historical reasons and should be avoided in
 532  * new code, as the correctness of its use cannot be checked. Always use
 533  * intel_runtime_pm_put() instead.
 534  */
 535 void intel_runtime_pm_put_unchecked(struct intel_runtime_pm *rpm)
 536 {
 537         __intel_runtime_pm_put(rpm, -1, true);
 538 }
 539
 540 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM)
 541 /**
 542  * intel_runtime_pm_put - release a runtime pm reference
 543  * @rpm: the intel_runtime_pm structure
 544  * @wref: wakeref acquired for the reference that is being released
 545  *
 546  * This function drops the device-level runtime pm reference obtained by
 547  * intel_runtime_pm_get() and might power down the corresponding
 548  * hardware block right away if this is the last reference.
 549  */
 550 void intel_runtime_pm_put(struct intel_runtime_pm *rpm, intel_wakeref_t wref)
 551 {
 552         __intel_runtime_pm_put(rpm, wref, true);
 553 }
 554 #endif
 555
 556 /**
 557  * intel_runtime_pm_enable - enable runtime pm
 558  * @rpm: the intel_runtime_pm structure
 559  *
 560  * This function enables runtime pm at the end of the driver load sequence.
 561  *
 562  * Note that this function does currently not enable runtime pm for the
 563  * subordinate display power domains. That is done by
 564  * intel_power_domains_enable().
 565  */
 566 void intel_runtime_pm_enable(struct intel_runtime_pm *rpm)
 567 {
 568         struct drm_i915_private *i915 = container_of(rpm,
 569                                                      struct drm_i915_private,
 570                                                      runtime_pm);
 571         struct device *kdev = rpm->kdev;
 572
 573         /*
 574          * Disable the system suspend direct complete optimization, which can
 575          * leave the device suspended skipping the driver's suspend handlers
 576          * if the device was already runtime suspended. This is needed due to
 577          * the difference in our runtime and system suspend sequence and
 578          * becaue the HDA driver may require us to enable the audio power
 579          * domain during system suspend.
 580          */
 581         dev_pm_set_driver_flags(kdev, DPM_FLAG_NO_DIRECT_COMPLETE);
 582
 583         pm_runtime_set_autosuspend_delay(kdev, 10000); /* 10s */
 584         pm_runtime_mark_last_busy(kdev);
 585
 586         /*
 587          * Take a permanent reference to disable the RPM functionality and drop
 588          * it only when unloading the driver. Use the low level get/put helpers,
 589          * so the driver's own RPM reference tracking asserts also work on
 590          * platforms without RPM support.
 591          */
 592         if (!rpm->available) {
 593                 int ret;
 594
 595                 pm_runtime_dont_use_autosuspend(kdev);
 596                 ret = pm_runtime_get_sync(kdev);
 597                 drm_WARN(&i915->drm, ret < 0,
 598                          "pm_runtime_get_sync() failed: %d\n", ret);
 599         } else {
 600                 pm_runtime_use_autosuspend(kdev);
 601         }
 602
 603         /*
 604          * The core calls the driver load handler with an RPM reference held.
 605          * We drop that here and will reacquire it during unloading in
 606          * intel_power_domains_fini().
 607          */
 608         pm_runtime_put_autosuspend(kdev);
 609 }
 610
 611 void intel_runtime_pm_disable(struct intel_runtime_pm *rpm)
 612 {
 613         struct drm_i915_private *i915 = container_of(rpm,
 614                                                      struct drm_i915_private,
 615                                                      runtime_pm);
 616         struct device *kdev = rpm->kdev;
 617
 618         /* Transfer rpm ownership back to core */
 619         drm_WARN(&i915->drm, pm_runtime_get_sync(kdev) < 0,
 620                  "Failed to pass rpm ownership back to core\n");
 621
 622         pm_runtime_dont_use_autosuspend(kdev);
 623
 624         if (!rpm->available)
 625                 pm_runtime_put(kdev);
 626 }
 627
 628 void intel_runtime_pm_driver_release(struct intel_runtime_pm *rpm)
 629 {
 630         struct drm_i915_private *i915 = container_of(rpm,
 631                                                      struct drm_i915_private,
 632                                                      runtime_pm);
 633         int count = atomic_read(&rpm->wakeref_count);
 634
 635         drm_WARN(&i915->drm, count,
 636                  "i915 raw-wakerefs=%d wakelocks=%d on cleanup\n",
 637                  intel_rpm_raw_wakeref_count(count),
 638                  intel_rpm_wakelock_count(count));
 639
 640         untrack_all_intel_runtime_pm_wakerefs(rpm);
 641 }
 642
 643 void intel_runtime_pm_init_early(struct intel_runtime_pm *rpm)
 644 {
 645         struct drm_i915_private *i915 =
 646                         container_of(rpm, struct drm_i915_private, runtime_pm);
 647         struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
 648         struct device *kdev = &pdev->dev;
 649
 650         rpm->kdev = kdev;
 651         rpm->available = HAS_RUNTIME_PM(i915);
 652
 653         init_intel_runtime_pm_wakeref(rpm);
 654 }