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 init_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm)
  69 {
  70         spin_lock_init(&rpm->debug.lock);
  71         stack_depot_init();
  72 }
  73
  74 static noinline depot_stack_handle_t
  75 track_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm)
  76 {
  77         depot_stack_handle_t stack, *stacks;
  78         unsigned long flags;
  79
  80         if (rpm->no_wakeref_tracking)
  81                 return -1;
  82
  83         stack = __save_depot_stack();
  84         if (!stack)
  85                 return -1;
  86
  87         spin_lock_irqsave(&rpm->debug.lock, flags);
  88
  89         if (!rpm->debug.count)
  90                 rpm->debug.last_acquire = stack;
  91
  92         stacks = krealloc(rpm->debug.owners,
  93                           (rpm->debug.count + 1) * sizeof(*stacks),
  94                           GFP_NOWAIT | __GFP_NOWARN);
  95         if (stacks) {
  96                 stacks[rpm->debug.count++] = stack;
  97                 rpm->debug.owners = stacks;
  98         } else {
  99                 stack = -1;
 100         }
 101
 102         spin_unlock_irqrestore(&rpm->debug.lock, flags);
 103
 104         return stack;
 105 }
 106
 107 static void untrack_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm,
 108                                              depot_stack_handle_t stack)
 109 {
 110         struct drm_i915_private *i915 = container_of(rpm,
 111                                                      struct drm_i915_private,
 112                                                      runtime_pm);
 113         unsigned long flags, n;
 114         bool found = false;
 115
 116         if (unlikely(stack == -1))
 117                 return;
 118
 119         spin_lock_irqsave(&rpm->debug.lock, flags);
 120         for (n = rpm->debug.count; n--; ) {
 121                 if (rpm->debug.owners[n] == stack) {
 122                         memmove(rpm->debug.owners + n,
 123                                 rpm->debug.owners + n + 1,
 124                                 (--rpm->debug.count - n) * sizeof(stack));
 125                         found = true;
 126                         break;
 127                 }
 128         }
 129         spin_unlock_irqrestore(&rpm->debug.lock, flags);
 130
 131         if (drm_WARN(&i915->drm, !found,
 132                      "Unmatched wakeref (tracking %lu), count %u\n",
 133                      rpm->debug.count, atomic_read(&rpm->wakeref_count))) {
 134                 char *buf;
 135
 136                 buf = kmalloc(PAGE_SIZE, GFP_NOWAIT | __GFP_NOWARN);
 137                 if (!buf)
 138                         return;
 139
 140                 stack_depot_snprint(stack, buf, PAGE_SIZE, 2);
 141                 DRM_DEBUG_DRIVER("wakeref %x from\n%s", stack, buf);
 142
 143                 stack = READ_ONCE(rpm->debug.last_release);
 144                 if (stack) {
 145                         stack_depot_snprint(stack, buf, PAGE_SIZE, 2);
 146                         DRM_DEBUG_DRIVER("wakeref last released at\n%s", buf);
 147                 }
 148
 149                 kfree(buf);
 150         }
 151 }
 152
 153 static int cmphandle(const void *_a, const void *_b)
 154 {
 155         const depot_stack_handle_t * const a = _a, * const b = _b;
 156
 157         if (*a < *b)
 158                 return -1;
 159         else if (*a > *b)
 160                 return 1;
 161         else
 162                 return 0;
 163 }
 164
 165 static void
 166 __print_intel_runtime_pm_wakeref(struct drm_printer *p,
 167                                  const struct intel_runtime_pm_debug *dbg)
 168 {
 169         unsigned long i;
 170         char *buf;
 171
 172         buf = kmalloc(PAGE_SIZE, GFP_NOWAIT | __GFP_NOWARN);
 173         if (!buf)
 174                 return;
 175
 176         if (dbg->last_acquire) {
 177                 stack_depot_snprint(dbg->last_acquire, buf, PAGE_SIZE, 2);
 178                 drm_printf(p, "Wakeref last acquired:\n%s", buf);
 179         }
 180
 181         if (dbg->last_release) {
 182                 stack_depot_snprint(dbg->last_release, buf, PAGE_SIZE, 2);
 183                 drm_printf(p, "Wakeref last released:\n%s", buf);
 184         }
 185
 186         drm_printf(p, "Wakeref count: %lu\n", dbg->count);
 187
 188         sort(dbg->owners, dbg->count, sizeof(*dbg->owners), cmphandle, NULL);
 189
 190         for (i = 0; i < dbg->count; i++) {
 191                 depot_stack_handle_t stack = dbg->owners[i];
 192                 unsigned long rep;
 193
 194                 rep = 1;
 195                 while (i + 1 < dbg->count && dbg->owners[i + 1] == stack)
 196                         rep++, i++;
 197                 stack_depot_snprint(stack, buf, PAGE_SIZE, 2);
 198                 drm_printf(p, "Wakeref x%lu taken at:\n%s", rep, buf);
 199         }
 200
 201         kfree(buf);
 202 }
 203
 204 static noinline void
 205 __untrack_all_wakerefs(struct intel_runtime_pm_debug *debug,
 206                        struct intel_runtime_pm_debug *saved)
 207 {
 208         *saved = *debug;
 209
 210         debug->owners = NULL;
 211         debug->count = 0;
 212         debug->last_release = __save_depot_stack();
 213 }
 214
 215 static void
 216 dump_and_free_wakeref_tracking(struct intel_runtime_pm_debug *debug)
 217 {
 218         if (debug->count) {
 219                 struct drm_printer p = drm_debug_printer("i915");
 220
 221                 __print_intel_runtime_pm_wakeref(&p, debug);
 222         }
 223
 224         kfree(debug->owners);
 225 }
 226
 227 static noinline void
 228 __intel_wakeref_dec_and_check_tracking(struct intel_runtime_pm *rpm)
 229 {
 230         struct intel_runtime_pm_debug dbg = {};
 231         unsigned long flags;
 232
 233         if (!atomic_dec_and_lock_irqsave(&rpm->wakeref_count,
 234                                          &rpm->debug.lock,
 235                                          flags))
 236                 return;
 237
 238         __untrack_all_wakerefs(&rpm->debug, &dbg);
 239         spin_unlock_irqrestore(&rpm->debug.lock, flags);
 240
 241         dump_and_free_wakeref_tracking(&dbg);
 242 }
 243
 244 static noinline void
 245 untrack_all_intel_runtime_pm_wakerefs(struct intel_runtime_pm *rpm)
 246 {
 247         struct intel_runtime_pm_debug dbg = {};
 248         unsigned long flags;
 249
 250         spin_lock_irqsave(&rpm->debug.lock, flags);
 251         __untrack_all_wakerefs(&rpm->debug, &dbg);
 252         spin_unlock_irqrestore(&rpm->debug.lock, flags);
 253
 254         dump_and_free_wakeref_tracking(&dbg);
 255 }
 256
 257 void print_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm,
 258                                     struct drm_printer *p)
 259 {
 260         struct intel_runtime_pm_debug dbg = {};
 261
 262         do {
 263                 unsigned long alloc = dbg.count;
 264                 depot_stack_handle_t *s;
 265
 266                 spin_lock_irq(&rpm->debug.lock);
 267                 dbg.count = rpm->debug.count;
 268                 if (dbg.count <= alloc) {
 269                         memcpy(dbg.owners,
 270                                rpm->debug.owners,
 271                                dbg.count * sizeof(*s));
 272                 }
 273                 dbg.last_acquire = rpm->debug.last_acquire;
 274                 dbg.last_release = rpm->debug.last_release;
 275                 spin_unlock_irq(&rpm->debug.lock);
 276                 if (dbg.count <= alloc)
 277                         break;
 278
 279                 s = krealloc(dbg.owners,
 280                              dbg.count * sizeof(*s),
 281                              GFP_NOWAIT | __GFP_NOWARN);
 282                 if (!s)
 283                         goto out;
 284
 285                 dbg.owners = s;
 286         } while (1);
 287
 288         __print_intel_runtime_pm_wakeref(p, &dbg);
 289
 290 out:
 291         kfree(dbg.owners);
 292 }
 293
 294 #else
 295
 296 static void init_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm)
 297 {
 298 }
 299
 300 static depot_stack_handle_t
 301 track_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm)
 302 {
 303         return -1;
 304 }
 305
 306 static void untrack_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm,
 307                                              intel_wakeref_t wref)
 308 {
 309 }
 310
 311 static void
 312 __intel_wakeref_dec_and_check_tracking(struct intel_runtime_pm *rpm)
 313 {
 314         atomic_dec(&rpm->wakeref_count);
 315 }
 316
 317 static void
 318 untrack_all_intel_runtime_pm_wakerefs(struct intel_runtime_pm *rpm)
 319 {
 320 }
 321
 322 #endif
 323
 324 static void
 325 intel_runtime_pm_acquire(struct intel_runtime_pm *rpm, bool wakelock)
 326 {
 327         if (wakelock) {
 328                 atomic_add(1 + INTEL_RPM_WAKELOCK_BIAS, &rpm->wakeref_count);
 329                 assert_rpm_wakelock_held(rpm);
 330         } else {
 331                 atomic_inc(&rpm->wakeref_count);
 332                 assert_rpm_raw_wakeref_held(rpm);
 333         }
 334 }
 335
 336 static void
 337 intel_runtime_pm_release(struct intel_runtime_pm *rpm, int wakelock)
 338 {
 339         if (wakelock) {
 340                 assert_rpm_wakelock_held(rpm);
 341                 atomic_sub(INTEL_RPM_WAKELOCK_BIAS, &rpm->wakeref_count);
 342         } else {
 343                 assert_rpm_raw_wakeref_held(rpm);
 344         }
 345
 346         __intel_wakeref_dec_and_check_tracking(rpm);
 347 }
 348
 349 static intel_wakeref_t __intel_runtime_pm_get(struct intel_runtime_pm *rpm,
 350                                               bool wakelock)
 351 {
 352         struct drm_i915_private *i915 = container_of(rpm,
 353                                                      struct drm_i915_private,
 354                                                      runtime_pm);
 355         int ret;
 356
 357         ret = pm_runtime_get_sync(rpm->kdev);
 358         drm_WARN_ONCE(&i915->drm, ret < 0,
 359                       "pm_runtime_get_sync() failed: %d\n", ret);
 360
 361         intel_runtime_pm_acquire(rpm, wakelock);
 362
 363         return track_intel_runtime_pm_wakeref(rpm);
 364 }
 365
 366 /**
 367  * intel_runtime_pm_get_raw - grab a raw runtime pm reference
 368  * @rpm: the intel_runtime_pm structure
 369  *
 370  * This is the unlocked version of intel_display_power_is_enabled() and should
 371  * only be used from error capture and recovery code where deadlocks are
 372  * possible.
 373  * This function grabs a device-level runtime pm reference (mostly used for
 374  * asynchronous PM management from display code) and ensures that it is powered
 375  * up. Raw references are not considered during wakelock assert checks.
 376  *
 377  * Any runtime pm reference obtained by this function must have a symmetric
 378  * call to intel_runtime_pm_put_raw() to release the reference again.
 379  *
 380  * Returns: the wakeref cookie to pass to intel_runtime_pm_put_raw(), evaluates
 381  * as True if the wakeref was acquired, or False otherwise.
 382  */
 383 intel_wakeref_t intel_runtime_pm_get_raw(struct intel_runtime_pm *rpm)
 384 {
 385         return __intel_runtime_pm_get(rpm, false);
 386 }
 387
 388 /**
 389  * intel_runtime_pm_get - grab a runtime pm reference
 390  * @rpm: the intel_runtime_pm structure
 391  *
 392  * This function grabs a device-level runtime pm reference (mostly used for GEM
 393  * code to ensure the GTT or GT is on) and ensures that it is powered up.
 394  *
 395  * Any runtime pm reference obtained by this function must have a symmetric
 396  * call to intel_runtime_pm_put() to release the reference again.
 397  *
 398  * Returns: the wakeref cookie to pass to intel_runtime_pm_put()
 399  */
 400 intel_wakeref_t intel_runtime_pm_get(struct intel_runtime_pm *rpm)
 401 {
 402         return __intel_runtime_pm_get(rpm, true);
 403 }
 404
 405 /**
 406  * __intel_runtime_pm_get_if_active - grab a runtime pm reference if device is active
 407  * @rpm: the intel_runtime_pm structure
 408  * @ignore_usecount: get a ref even if dev->power.usage_count is 0
 409  *
 410  * This function grabs a device-level runtime pm reference if the device is
 411  * already active and ensures that it is powered up. It is illegal to try
 412  * and access the HW should intel_runtime_pm_get_if_active() report failure.
 413  *
 414  * If @ignore_usecount is true, a reference will be acquired even if there is no
 415  * user requiring the device to be powered up (dev->power.usage_count == 0).
 416  * If the function returns false in this case then it's guaranteed that the
 417  * device's runtime suspend hook has been called already or that it will be
 418  * called (and hence it's also guaranteed that the device's runtime resume
 419  * hook will be called eventually).
 420  *
 421  * Any runtime pm reference obtained by this function must have a symmetric
 422  * call to intel_runtime_pm_put() to release the reference again.
 423  *
 424  * Returns: the wakeref cookie to pass to intel_runtime_pm_put(), evaluates
 425  * as True if the wakeref was acquired, or False otherwise.
 426  */
 427 static intel_wakeref_t __intel_runtime_pm_get_if_active(struct intel_runtime_pm *rpm,
 428                                                         bool ignore_usecount)
 429 {
 430         if (IS_ENABLED(CONFIG_PM)) {
 431                 /*
 432                  * In cases runtime PM is disabled by the RPM core and we get
 433                  * an -EINVAL return value we are not supposed to call this
 434                  * function, since the power state is undefined. This applies
 435                  * atm to the late/early system suspend/resume handlers.
 436                  */
 437                 if (pm_runtime_get_if_active(rpm->kdev, ignore_usecount) <= 0)
 438                         return 0;
 439         }
 440
 441         intel_runtime_pm_acquire(rpm, true);
 442
 443         return track_intel_runtime_pm_wakeref(rpm);
 444 }
 445
 446 intel_wakeref_t intel_runtime_pm_get_if_in_use(struct intel_runtime_pm *rpm)
 447 {
 448         return __intel_runtime_pm_get_if_active(rpm, false);
 449 }
 450
 451 intel_wakeref_t intel_runtime_pm_get_if_active(struct intel_runtime_pm *rpm)
 452 {
 453         return __intel_runtime_pm_get_if_active(rpm, true);
 454 }
 455
 456 /**
 457  * intel_runtime_pm_get_noresume - grab a runtime pm reference
 458  * @rpm: the intel_runtime_pm structure
 459  *
 460  * This function grabs a device-level runtime pm reference (mostly used for GEM
 461  * code to ensure the GTT or GT is on).
 462  *
 463  * It will _not_ power up the device but instead only check that it's powered
 464  * on.  Therefore it is only valid to call this functions from contexts where
 465  * the device is known to be powered up and where trying to power it up would
 466  * result in hilarity and deadlocks. That pretty much means only the system
 467  * suspend/resume code where this is used to grab runtime pm references for
 468  * delayed setup down in work items.
 469  *
 470  * Any runtime pm reference obtained by this function must have a symmetric
 471  * call to intel_runtime_pm_put() to release the reference again.
 472  *
 473  * Returns: the wakeref cookie to pass to intel_runtime_pm_put()
 474  */
 475 intel_wakeref_t intel_runtime_pm_get_noresume(struct intel_runtime_pm *rpm)
 476 {
 477         assert_rpm_wakelock_held(rpm);
 478         pm_runtime_get_noresume(rpm->kdev);
 479
 480         intel_runtime_pm_acquire(rpm, true);
 481
 482         return track_intel_runtime_pm_wakeref(rpm);
 483 }
 484
 485 static void __intel_runtime_pm_put(struct intel_runtime_pm *rpm,
 486                                    intel_wakeref_t wref,
 487                                    bool wakelock)
 488 {
 489         struct device *kdev = rpm->kdev;
 490
 491         untrack_intel_runtime_pm_wakeref(rpm, wref);
 492
 493         intel_runtime_pm_release(rpm, wakelock);
 494
 495         pm_runtime_mark_last_busy(kdev);
 496         pm_runtime_put_autosuspend(kdev);
 497 }
 498
 499 /**
 500  * intel_runtime_pm_put_raw - release a raw runtime pm reference
 501  * @rpm: the intel_runtime_pm structure
 502  * @wref: wakeref acquired for the reference that is being released
 503  *
 504  * This function drops the device-level runtime pm reference obtained by
 505  * intel_runtime_pm_get_raw() and might power down the corresponding
 506  * hardware block right away if this is the last reference.
 507  */
 508 void
 509 intel_runtime_pm_put_raw(struct intel_runtime_pm *rpm, intel_wakeref_t wref)
 510 {
 511         __intel_runtime_pm_put(rpm, wref, false);
 512 }
 513
 514 /**
 515  * intel_runtime_pm_put_unchecked - release an unchecked runtime pm reference
 516  * @rpm: the intel_runtime_pm structure
 517  *
 518  * This function drops the device-level runtime pm reference obtained by
 519  * intel_runtime_pm_get() and might power down the corresponding
 520  * hardware block right away if this is the last reference.
 521  *
 522  * This function exists only for historical reasons and should be avoided in
 523  * new code, as the correctness of its use cannot be checked. Always use
 524  * intel_runtime_pm_put() instead.
 525  */
 526 void intel_runtime_pm_put_unchecked(struct intel_runtime_pm *rpm)
 527 {
 528         __intel_runtime_pm_put(rpm, -1, true);
 529 }
 530
 531 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM)
 532 /**
 533  * intel_runtime_pm_put - release a runtime pm reference
 534  * @rpm: the intel_runtime_pm structure
 535  * @wref: wakeref acquired for the reference that is being released
 536  *
 537  * This function drops the device-level runtime pm reference obtained by
 538  * intel_runtime_pm_get() and might power down the corresponding
 539  * hardware block right away if this is the last reference.
 540  */
 541 void intel_runtime_pm_put(struct intel_runtime_pm *rpm, intel_wakeref_t wref)
 542 {
 543         __intel_runtime_pm_put(rpm, wref, true);
 544 }
 545 #endif
 546
 547 /**
 548  * intel_runtime_pm_enable - enable runtime pm
 549  * @rpm: the intel_runtime_pm structure
 550  *
 551  * This function enables runtime pm at the end of the driver load sequence.
 552  *
 553  * Note that this function does currently not enable runtime pm for the
 554  * subordinate display power domains. That is done by
 555  * intel_power_domains_enable().
 556  */
 557 void intel_runtime_pm_enable(struct intel_runtime_pm *rpm)
 558 {
 559         struct drm_i915_private *i915 = container_of(rpm,
 560                                                      struct drm_i915_private,
 561                                                      runtime_pm);
 562         struct device *kdev = rpm->kdev;
 563
 564         /*
 565          * Disable the system suspend direct complete optimization, which can
 566          * leave the device suspended skipping the driver's suspend handlers
 567          * if the device was already runtime suspended. This is needed due to
 568          * the difference in our runtime and system suspend sequence and
 569          * becaue the HDA driver may require us to enable the audio power
 570          * domain during system suspend.
 571          */
 572         dev_pm_set_driver_flags(kdev, DPM_FLAG_NO_DIRECT_COMPLETE);
 573
 574         pm_runtime_set_autosuspend_delay(kdev, 10000); /* 10s */
 575         pm_runtime_mark_last_busy(kdev);
 576
 577         /*
 578          * Take a permanent reference to disable the RPM functionality and drop
 579          * it only when unloading the driver. Use the low level get/put helpers,
 580          * so the driver's own RPM reference tracking asserts also work on
 581          * platforms without RPM support.
 582          */
 583         if (!rpm->available) {
 584                 int ret;
 585
 586                 pm_runtime_dont_use_autosuspend(kdev);
 587                 ret = pm_runtime_get_sync(kdev);
 588                 drm_WARN(&i915->drm, ret < 0,
 589                          "pm_runtime_get_sync() failed: %d\n", ret);
 590         } else {
 591                 pm_runtime_use_autosuspend(kdev);
 592         }
 593
 594         /*
 595          *  FIXME: Temp hammer to keep autosupend disable on lmem supported platforms.
 596          *  As per PCIe specs 5.3.1.4.1, all iomem read write request over a PCIe
 597          *  function will be unsupported in case PCIe endpoint function is in D3.
 598          *  Let's keep i915 autosuspend control 'on' till we fix all known issue
 599          *  with lmem access in D3.
 600          */
 601         if (!IS_DGFX(i915))
 602                 pm_runtime_allow(kdev);
 603
 604         /*
 605          * The core calls the driver load handler with an RPM reference held.
 606          * We drop that here and will reacquire it during unloading in
 607          * intel_power_domains_fini().
 608          */
 609         pm_runtime_put_autosuspend(kdev);
 610 }
 611
 612 void intel_runtime_pm_disable(struct intel_runtime_pm *rpm)
 613 {
 614         struct drm_i915_private *i915 = container_of(rpm,
 615                                                      struct drm_i915_private,
 616                                                      runtime_pm);
 617         struct device *kdev = rpm->kdev;
 618
 619         /* Transfer rpm ownership back to core */
 620         drm_WARN(&i915->drm, pm_runtime_get_sync(kdev) < 0,
 621                  "Failed to pass rpm ownership back to core\n");
 622
 623         pm_runtime_dont_use_autosuspend(kdev);
 624
 625         if (!rpm->available)
 626                 pm_runtime_put(kdev);
 627 }
 628
 629 void intel_runtime_pm_driver_release(struct intel_runtime_pm *rpm)
 630 {
 631         struct drm_i915_private *i915 = container_of(rpm,
 632                                                      struct drm_i915_private,
 633                                                      runtime_pm);
 634         int count = atomic_read(&rpm->wakeref_count);
 635
 636         intel_wakeref_auto_fini(&rpm->userfault_wakeref);
 637
 638         drm_WARN(&i915->drm, count,
 639                  "i915 raw-wakerefs=%d wakelocks=%d on cleanup\n",
 640                  intel_rpm_raw_wakeref_count(count),
 641                  intel_rpm_wakelock_count(count));
 642
 643         untrack_all_intel_runtime_pm_wakerefs(rpm);
 644 }
 645
 646 void intel_runtime_pm_init_early(struct intel_runtime_pm *rpm)
 647 {
 648         struct drm_i915_private *i915 =
 649                         container_of(rpm, struct drm_i915_private, runtime_pm);
 650         struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
 651         struct device *kdev = &pdev->dev;
 652
 653         rpm->kdev = kdev;
 654         rpm->available = HAS_RUNTIME_PM(i915);
 655
 656         init_intel_runtime_pm_wakeref(rpm);
 657         INIT_LIST_HEAD(&rpm->lmem_userfault_list);
 658         spin_lock_init(&rpm->lmem_userfault_lock);
 659         intel_wakeref_auto_init(&rpm->userfault_wakeref, rpm);
 660 }