drivers/gpu/drm/nouveau/nvkm/core/engctx.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/engctx.h>
  25 #include <core/engine.h>
  26 #include <core/client.h>
  27
  28 static inline int
  29 nvkm_engctx_exists(struct nvkm_object *parent,
  30                    struct nvkm_engine *engine, void **pobject)
  31 {
  32         struct nvkm_engctx *engctx;
  33         struct nvkm_object *parctx;
  34
  35         list_for_each_entry(engctx, &engine->contexts, head) {
  36                 parctx = nv_pclass(nv_object(engctx), NV_PARENT_CLASS);
  37                 if (parctx == parent) {
  38                         atomic_inc(&nv_object(engctx)->refcount);
  39                         *pobject = engctx;
  40                         return 1;
  41                 }
  42         }
  43
  44         return 0;
  45 }
  46
  47 int
  48 nvkm_engctx_create_(struct nvkm_object *parent, struct nvkm_object *engobj,
  49                     struct nvkm_oclass *oclass, struct nvkm_object *pargpu,
  50                     u32 size, u32 align, u32 flags, int length, void **pobject)
  51 {
  52         struct nvkm_client *client = nvkm_client(parent);
  53         struct nvkm_engine *engine = nv_engine(engobj);
  54         struct nvkm_object *engctx;
  55         unsigned long save;
  56         int ret;
  57
  58         /* check if this engine already has a context for the parent object,
  59          * and reference it instead of creating a new one
  60          */
  61         spin_lock_irqsave(&engine->lock, save);
  62         ret = nvkm_engctx_exists(parent, engine, pobject);
  63         spin_unlock_irqrestore(&engine->lock, save);
  64         if (ret)
  65                 return ret;
  66
  67         /* create the new context, supports creating both raw objects and
  68          * objects backed by instance memory
  69          */
  70         if (size) {
  71                 ret = nvkm_gpuobj_create_(parent, engobj, oclass,
  72                                           NV_ENGCTX_CLASS, pargpu, size,
  73                                           align, flags, length, pobject);
  74         } else {
  75                 ret = nvkm_object_create_(parent, engobj, oclass,
  76                                           NV_ENGCTX_CLASS, length, pobject);
  77         }
  78
  79         engctx = *pobject;
  80         if (ret)
  81                 return ret;
  82
  83         /* must take the lock again and re-check a context doesn't already
  84          * exist (in case of a race) - the lock had to be dropped before as
  85          * it's not possible to allocate the object with it held.
  86          */
  87         spin_lock_irqsave(&engine->lock, save);
  88         ret = nvkm_engctx_exists(parent, engine, pobject);
  89         if (ret) {
  90                 spin_unlock_irqrestore(&engine->lock, save);
  91                 nvkm_object_ref(NULL, &engctx);
  92                 return ret;
  93         }
  94
  95         if (client->vm)
  96                 atomic_inc(&client->vm->engref[nv_engidx(engine)]);
  97         list_add(&nv_engctx(engctx)->head, &engine->contexts);
  98         nv_engctx(engctx)->addr = ~0ULL;
  99         spin_unlock_irqrestore(&engine->lock, save);
 100         return 0;
 101 }
 102
 103 void
 104 nvkm_engctx_destroy(struct nvkm_engctx *engctx)
 105 {
 106         struct nvkm_engine *engine = engctx->gpuobj.object.engine;
 107         struct nvkm_client *client = nvkm_client(engctx);
 108         unsigned long save;
 109
 110         nvkm_gpuobj_unmap(&engctx->vma);
 111         spin_lock_irqsave(&engine->lock, save);
 112         list_del(&engctx->head);
 113         spin_unlock_irqrestore(&engine->lock, save);
 114
 115         if (client->vm)
 116                 atomic_dec(&client->vm->engref[nv_engidx(engine)]);
 117
 118         if (engctx->gpuobj.size)
 119                 nvkm_gpuobj_destroy(&engctx->gpuobj);
 120         else
 121                 nvkm_object_destroy(&engctx->gpuobj.object);
 122 }
 123
 124 int
 125 nvkm_engctx_init(struct nvkm_engctx *engctx)
 126 {
 127         struct nvkm_object *object = nv_object(engctx);
 128         struct nvkm_subdev *subdev = nv_subdev(object->engine);
 129         struct nvkm_object *parent;
 130         struct nvkm_subdev *pardev;
 131         int ret;
 132
 133         ret = nvkm_gpuobj_init(&engctx->gpuobj);
 134         if (ret)
 135                 return ret;
 136
 137         parent = nv_pclass(object->parent, NV_PARENT_CLASS);
 138         pardev = nv_subdev(parent->engine);
 139         if (nv_parent(parent)->context_attach) {
 140                 mutex_lock(&pardev->mutex);
 141                 ret = nv_parent(parent)->context_attach(parent, object);
 142                 mutex_unlock(&pardev->mutex);
 143         }
 144
 145         if (ret) {
 146                 nv_error(parent, "failed to attach %s context, %d\n",
 147                          subdev->name, ret);
 148                 return ret;
 149         }
 150
 151         nv_debug(parent, "attached %s context\n", subdev->name);
 152         return 0;
 153 }
 154
 155 int
 156 nvkm_engctx_fini(struct nvkm_engctx *engctx, bool suspend)
 157 {
 158         struct nvkm_object *object = nv_object(engctx);
 159         struct nvkm_subdev *subdev = nv_subdev(object->engine);
 160         struct nvkm_object *parent;
 161         struct nvkm_subdev *pardev;
 162         int ret = 0;
 163
 164         parent = nv_pclass(object->parent, NV_PARENT_CLASS);
 165         pardev = nv_subdev(parent->engine);
 166         if (nv_parent(parent)->context_detach) {
 167                 mutex_lock(&pardev->mutex);
 168                 ret = nv_parent(parent)->context_detach(parent, suspend, object);
 169                 mutex_unlock(&pardev->mutex);
 170         }
 171
 172         if (ret) {
 173                 nv_error(parent, "failed to detach %s context, %d\n",
 174                          subdev->name, ret);
 175                 return ret;
 176         }
 177
 178         nv_debug(parent, "detached %s context\n", subdev->name);
 179         return nvkm_gpuobj_fini(&engctx->gpuobj, suspend);
 180 }
 181
 182 int
 183 _nvkm_engctx_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
 184                   struct nvkm_oclass *oclass, void *data, u32 size,
 185                   struct nvkm_object **pobject)
 186 {
 187         struct nvkm_engctx *engctx;
 188         int ret;
 189
 190         ret = nvkm_engctx_create(parent, engine, oclass, NULL, 256, 256,
 191                                  NVOBJ_FLAG_ZERO_ALLOC, &engctx);
 192         *pobject = nv_object(engctx);
 193         return ret;
 194 }
 195
 196 void
 197 _nvkm_engctx_dtor(struct nvkm_object *object)
 198 {
 199         nvkm_engctx_destroy(nv_engctx(object));
 200 }
 201
 202 int
 203 _nvkm_engctx_init(struct nvkm_object *object)
 204 {
 205         return nvkm_engctx_init(nv_engctx(object));
 206 }
 207
 208 int
 209 _nvkm_engctx_fini(struct nvkm_object *object, bool suspend)
 210 {
 211         return nvkm_engctx_fini(nv_engctx(object), suspend);
 212 }
 213
 214 struct nvkm_object *
 215 nvkm_engctx_get(struct nvkm_engine *engine, u64 addr)
 216 {
 217         struct nvkm_engctx *engctx;
 218         unsigned long flags;
 219
 220         spin_lock_irqsave(&engine->lock, flags);
 221         list_for_each_entry(engctx, &engine->contexts, head) {
 222                 if (engctx->addr == addr) {
 223                         engctx->save = flags;
 224                         return nv_object(engctx);
 225                 }
 226         }
 227         spin_unlock_irqrestore(&engine->lock, flags);
 228         return NULL;
 229 }
 230
 231 void
 232 nvkm_engctx_put(struct nvkm_object *object)
 233 {
 234         if (object) {
 235                 struct nvkm_engine *engine = nv_engine(object->engine);
 236                 struct nvkm_engctx *engctx = nv_engctx(object);
 237                 spin_unlock_irqrestore(&engine->lock, engctx->save);
 238         }
 239 }