kernel/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 void
  31 nvkm_engine_unref(struct nvkm_engine **pengine)
  32 {
  33         struct nvkm_engine *engine = *pengine;
  34         if (engine) {
  35                 mutex_lock(&engine->subdev.mutex);
  36                 if (--engine->usecount == 0)
  37                         nvkm_subdev_fini(&engine->subdev, false);
  38                 mutex_unlock(&engine->subdev.mutex);
  39                 *pengine = NULL;
  40         }
  41 }
  42
  43 struct nvkm_engine *
  44 nvkm_engine_ref(struct nvkm_engine *engine)
  45 {
  46         if (engine) {
  47                 mutex_lock(&engine->subdev.mutex);
  48                 if (++engine->usecount == 1) {
  49                         int ret = nvkm_subdev_init(&engine->subdev);
  50                         if (ret) {
  51                                 engine->usecount--;
  52                                 mutex_unlock(&engine->subdev.mutex);
  53                                 return ERR_PTR(ret);
  54                         }
  55                 }
  56                 mutex_unlock(&engine->subdev.mutex);
  57         }
  58         return engine;
  59 }
  60
  61 void
  62 nvkm_engine_tile(struct nvkm_engine *engine, int region)
  63 {
  64         struct nvkm_fb *fb = engine->subdev.device->fb;
  65         if (engine->func->tile)
  66                 engine->func->tile(engine, region, &fb->tile.region[region]);
  67 }
  68
  69 static void
  70 nvkm_engine_intr(struct nvkm_subdev *subdev)
  71 {
  72         struct nvkm_engine *engine = nvkm_engine(subdev);
  73         if (engine->func->intr)
  74                 engine->func->intr(engine);
  75 }
  76
  77 static int
  78 nvkm_engine_fini(struct nvkm_subdev *subdev, bool suspend)
  79 {
  80         struct nvkm_engine *engine = nvkm_engine(subdev);
  81         if (engine->func->fini)
  82                 return engine->func->fini(engine, suspend);
  83         return 0;
  84 }
  85
  86 static int
  87 nvkm_engine_init(struct nvkm_subdev *subdev)
  88 {
  89         struct nvkm_engine *engine = nvkm_engine(subdev);
  90         struct nvkm_fb *fb = subdev->device->fb;
  91         int ret = 0, i;
  92         s64 time;
  93
  94         if (!engine->usecount) {
  95                 nvkm_trace(subdev, "init skipped, engine has no users\n");
  96                 return ret;
  97         }
  98
  99         if (engine->func->oneinit && !engine->subdev.oneinit) {
 100                 nvkm_trace(subdev, "one-time init running...\n");
 101                 time = ktime_to_us(ktime_get());
 102                 ret = engine->func->oneinit(engine);
 103                 if (ret) {
 104                         nvkm_trace(subdev, "one-time init failed, %d\n", ret);
 105                         return ret;
 106                 }
 107
 108                 engine->subdev.oneinit = true;
 109                 time = ktime_to_us(ktime_get()) - time;
 110                 nvkm_trace(subdev, "one-time init completed in %lldus\n", time);
 111         }
 112
 113         if (engine->func->init)
 114                 ret = engine->func->init(engine);
 115
 116         for (i = 0; fb && i < fb->tile.regions; i++)
 117                 nvkm_engine_tile(engine, i);
 118         return ret;
 119 }
 120
 121 static void *
 122 nvkm_engine_dtor(struct nvkm_subdev *subdev)
 123 {
 124         struct nvkm_engine *engine = nvkm_engine(subdev);
 125         if (engine->func->dtor)
 126                 return engine->func->dtor(engine);
 127         return engine;
 128 }
 129
 130 static const struct nvkm_subdev_func
 131 nvkm_engine_func = {
 132         .dtor = nvkm_engine_dtor,
 133         .init = nvkm_engine_init,
 134         .fini = nvkm_engine_fini,
 135         .intr = nvkm_engine_intr,
 136 };
 137
 138 int
 139 nvkm_engine_ctor(const struct nvkm_engine_func *func,
 140                  struct nvkm_device *device, int index, u32 pmc_enable,
 141                  bool enable, struct nvkm_engine *engine)
 142 {
 143         nvkm_subdev_ctor(&nvkm_engine_func, device, index,
 144                          pmc_enable, &engine->subdev);
 145         engine->func = func;
 146
 147         if (!nvkm_boolopt(device->cfgopt, nvkm_subdev_name[index], enable)) {
 148                 nvkm_debug(&engine->subdev, "disabled\n");
 149                 return -ENODEV;
 150         }
 151
 152         spin_lock_init(&engine->lock);
 153         return 0;
 154 }
 155
 156 int
 157 nvkm_engine_new_(const struct nvkm_engine_func *func,
 158                  struct nvkm_device *device, int index, u32 pmc_enable,
 159                  bool enable, struct nvkm_engine **pengine)
 160 {
 161         if (!(*pengine = kzalloc(sizeof(**pengine), GFP_KERNEL)))
 162                 return -ENOMEM;
 163         return nvkm_engine_ctor(func, device, index, pmc_enable,
 164                                 enable, *pengine);
 165 }