LCOV - code coverage report
Current view: top level - drivers/gpu/drm/i915 - intel_runtime_pm.c (source / functions) Hit Total Coverage
Test: combined.info Lines: 0 91 0.0 %
Date: 2022-04-01 14:35:51 Functions: 0 14 0.0 %
Branches: 0 20 0.0 %

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

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