drivers/gpu/drm/nouveau/nvkm/core/engine.c

   1 /*
   2  * Copyright 2012 Red Hat Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: Ben Skeggs
  23  */
  24 #include <core/engine.h>
  25 #include <core/device.h>
  26 #include <core/option.h>
  27
  28 #include <subdev/fb.h>
  29
  30 bool
  31 nvkm_engine_chsw_load(struct nvkm_engine *engine)
  32 {
  33         if (engine->func->chsw_load)
  34                 return engine->func->chsw_load(engine);
  35         return false;
  36 }
  37
  38 void
  39 nvkm_engine_unref(struct nvkm_engine **pengine)
  40 {
  41         struct nvkm_engine *engine = *pengine;
  42         if (engine) {
  43                 mutex_lock(&engine->subdev.mutex);
  44                 if (--engine->usecount == 0)
  45                         nvkm_subdev_fini(&engine->subdev, false);
  46                 mutex_unlock(&engine->subdev.mutex);
  47                 *pengine = NULL;
  48         }
  49 }
  50
  51 struct nvkm_engine *
  52 nvkm_engine_ref(struct nvkm_engine *engine)
  53 {
  54         if (engine) {
  55                 mutex_lock(&engine->subdev.mutex);
  56                 if (++engine->usecount == 1) {
  57                         int ret = nvkm_subdev_init(&engine->subdev);
  58                         if (ret) {
  59                                 engine->usecount--;
  60                                 mutex_unlock(&engine->subdev.mutex);
  61                                 return ERR_PTR(ret);
  62                         }
  63                 }
  64                 mutex_unlock(&engine->subdev.mutex);
  65         }
  66         return engine;
  67 }
  68
  69 void
  70 nvkm_engine_tile(struct nvkm_engine *engine, int region)
  71 {
  72         struct nvkm_fb *fb = engine->subdev.device->fb;
  73         if (engine->func->tile)
  74                 engine->func->tile(engine, region, &fb->tile.region[region]);
  75 }
  76
  77 static void
  78 nvkm_engine_intr(struct nvkm_subdev *subdev)
  79 {
  80         struct nvkm_engine *engine = nvkm_engine(subdev);
  81         if (engine->func->intr)
  82                 engine->func->intr(engine);
  83 }
  84
  85 static int
  86 nvkm_engine_info(struct nvkm_subdev *subdev, u64 mthd, u64 *data)
  87 {
  88         struct nvkm_engine *engine = nvkm_engine(subdev);
  89         if (engine->func->info) {
  90                 if (!IS_ERR((engine = nvkm_engine_ref(engine)))) {
  91                         int ret = engine->func->info(engine, mthd, data);
  92                         nvkm_engine_unref(&engine);
  93                         return ret;
  94                 }
  95                 return PTR_ERR(engine);
  96         }
  97         return -ENOSYS;
  98 }
  99
 100 static int
 101 nvkm_engine_fini(struct nvkm_subdev *subdev, bool suspend)
 102 {
 103         struct nvkm_engine *engine = nvkm_engine(subdev);
 104         if (engine->func->fini)
 105                 return engine->func->fini(engine, suspend);
 106         return 0;
 107 }
 108
 109 static int
 110 nvkm_engine_init(struct nvkm_subdev *subdev)
 111 {
 112         struct nvkm_engine *engine = nvkm_engine(subdev);
 113         struct nvkm_fb *fb = subdev->device->fb;
 114         int ret = 0, i;
 115         s64 time;
 116
 117         if (!engine->usecount) {
 118                 nvkm_trace(subdev, "init skipped, engine has no users\n");
 119                 return ret;
 120         }
 121
 122         if (engine->func->oneinit && !engine->subdev.oneinit) {
 123                 nvkm_trace(subdev, "one-time init running...\n");
 124                 time = ktime_to_us(ktime_get());
 125                 ret = engine->func->oneinit(engine);
 126                 if (ret) {
 127                         nvkm_trace(subdev, "one-time init failed, %d\n", ret);
 128                         return ret;
 129                 }
 130
 131                 engine->subdev.oneinit = true;
 132                 time = ktime_to_us(ktime_get()) - time;
 133                 nvkm_trace(subdev, "one-time init completed in %lldus\n", time);
 134         }
 135
 136         if (engine->func->init)
 137                 ret = engine->func->init(engine);
 138
 139         for (i = 0; fb && i < fb->tile.regions; i++)
 140                 nvkm_engine_tile(engine, i);
 141         return ret;
 142 }
 143
 144 static int
 145 nvkm_engine_preinit(struct nvkm_subdev *subdev)
 146 {
 147         struct nvkm_engine *engine = nvkm_engine(subdev);
 148         if (engine->func->preinit)
 149                 engine->func->preinit(engine);
 150         return 0;
 151 }
 152
 153 static void *
 154 nvkm_engine_dtor(struct nvkm_subdev *subdev)
 155 {
 156         struct nvkm_engine *engine = nvkm_engine(subdev);
 157         if (engine->func->dtor)
 158                 return engine->func->dtor(engine);
 159         return engine;
 160 }
 161
 162 static const struct nvkm_subdev_func
 163 nvkm_engine_func = {
 164         .dtor = nvkm_engine_dtor,
 165         .preinit = nvkm_engine_preinit,
 166         .init = nvkm_engine_init,
 167         .fini = nvkm_engine_fini,
 168         .info = nvkm_engine_info,
 169         .intr = nvkm_engine_intr,
 170 };
 171
 172 int
 173 nvkm_engine_ctor(const struct nvkm_engine_func *func,
 174                  struct nvkm_device *device, int index, bool enable,
 175                  struct nvkm_engine *engine)
 176 {
 177         nvkm_subdev_ctor(&nvkm_engine_func, device, index, &engine->subdev);
 178         engine->func = func;
 179
 180         if (!nvkm_boolopt(device->cfgopt, nvkm_subdev_name[index], enable)) {
 181                 nvkm_debug(&engine->subdev, "disabled\n");
 182                 return -ENODEV;
 183         }
 184
 185         spin_lock_init(&engine->lock);
 186         return 0;
 187 }
 188
 189 int
 190 nvkm_engine_new_(const struct nvkm_engine_func *func,
 191                  struct nvkm_device *device, int index, bool enable,
 192                  struct nvkm_engine **pengine)
 193 {
 194         if (!(*pengine = kzalloc(sizeof(**pengine), GFP_KERNEL)))
 195                 return -ENOMEM;
 196         return nvkm_engine_ctor(func, device, index, enable, *pengine);
 197 }