drivers/gpu/drm/nouveau/nouveau_abi16.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  */
  23
  24 #include <nvif/client.h>
  25 #include <nvif/driver.h>
  26 #include <nvif/ioctl.h>
  27 #include <nvif/class.h>
  28 #include <nvif/unpack.h>
  29
  30 #include "nouveau_drm.h"
  31 #include "nouveau_dma.h"
  32 #include "nouveau_gem.h"
  33 #include "nouveau_chan.h"
  34 #include "nouveau_abi16.h"
  35
  36 static struct nouveau_abi16 *
  37 nouveau_abi16(struct drm_file *file_priv)
  38 {
  39         struct nouveau_cli *cli = nouveau_cli(file_priv);
  40         if (!cli->abi16) {
  41                 struct nouveau_abi16 *abi16;
  42                 cli->abi16 = abi16 = kzalloc(sizeof(*abi16), GFP_KERNEL);
  43                 if (cli->abi16) {
  44                         struct nv_device_v0 args = {
  45                                 .device = ~0ULL,
  46                         };
  47
  48                         INIT_LIST_HEAD(&abi16->channels);
  49
  50                         /* allocate device object targeting client's default
  51                          * device (ie. the one that belongs to the fd it
  52                          * opened)
  53                          */
  54                         if (nvif_device_init(&cli->base.object, 0, NV_DEVICE,
  55                                              &args, sizeof(args),
  56                                              &abi16->device) == 0)
  57                                 return cli->abi16;
  58
  59                         kfree(cli->abi16);
  60                         cli->abi16 = NULL;
  61                 }
  62         }
  63         return cli->abi16;
  64 }
  65
  66 struct nouveau_abi16 *
  67 nouveau_abi16_get(struct drm_file *file_priv)
  68 {
  69         struct nouveau_cli *cli = nouveau_cli(file_priv);
  70         mutex_lock(&cli->mutex);
  71         if (nouveau_abi16(file_priv))
  72                 return cli->abi16;
  73         mutex_unlock(&cli->mutex);
  74         return NULL;
  75 }
  76
  77 int
  78 nouveau_abi16_put(struct nouveau_abi16 *abi16, int ret)
  79 {
  80         struct nouveau_cli *cli = (void *)abi16->device.object.client;
  81         mutex_unlock(&cli->mutex);
  82         return ret;
  83 }
  84
  85 s32
  86 nouveau_abi16_swclass(struct nouveau_drm *drm)
  87 {
  88         switch (drm->device.info.family) {
  89         case NV_DEVICE_INFO_V0_TNT:
  90                 return NVIF_IOCTL_NEW_V0_SW_NV04;
  91         case NV_DEVICE_INFO_V0_CELSIUS:
  92         case NV_DEVICE_INFO_V0_KELVIN:
  93         case NV_DEVICE_INFO_V0_RANKINE:
  94         case NV_DEVICE_INFO_V0_CURIE:
  95                 return NVIF_IOCTL_NEW_V0_SW_NV10;
  96         case NV_DEVICE_INFO_V0_TESLA:
  97                 return NVIF_IOCTL_NEW_V0_SW_NV50;
  98         case NV_DEVICE_INFO_V0_FERMI:
  99         case NV_DEVICE_INFO_V0_KEPLER:
 100         case NV_DEVICE_INFO_V0_MAXWELL:
 101                 return NVIF_IOCTL_NEW_V0_SW_GF100;
 102         }
 103
 104         return 0x0000;
 105 }
 106
 107 static void
 108 nouveau_abi16_ntfy_fini(struct nouveau_abi16_chan *chan,
 109                         struct nouveau_abi16_ntfy *ntfy)
 110 {
 111         nvif_object_fini(&ntfy->object);
 112         nvkm_mm_free(&chan->heap, &ntfy->node);
 113         list_del(&ntfy->head);
 114         kfree(ntfy);
 115 }
 116
 117 static void
 118 nouveau_abi16_chan_fini(struct nouveau_abi16 *abi16,
 119                         struct nouveau_abi16_chan *chan)
 120 {
 121         struct nouveau_abi16_ntfy *ntfy, *temp;
 122
 123         /* wait for all activity to stop before releasing notify object, which
 124          * may be still in use */
 125         if (chan->chan && chan->ntfy)
 126                 nouveau_channel_idle(chan->chan);
 127
 128         /* cleanup notifier state */
 129         list_for_each_entry_safe(ntfy, temp, &chan->notifiers, head) {
 130                 nouveau_abi16_ntfy_fini(chan, ntfy);
 131         }
 132
 133         if (chan->ntfy) {
 134                 nouveau_bo_vma_del(chan->ntfy, &chan->ntfy_vma);
 135                 nouveau_bo_unpin(chan->ntfy);
 136                 drm_gem_object_unreference_unlocked(&chan->ntfy->gem);
 137         }
 138
 139         if (chan->heap.block_size)
 140                 nvkm_mm_fini(&chan->heap);
 141
 142         /* destroy channel object, all children will be killed too */
 143         if (chan->chan) {
 144                 nouveau_channel_idle(chan->chan);
 145                 nouveau_channel_del(&chan->chan);
 146         }
 147
 148         list_del(&chan->head);
 149         kfree(chan);
 150 }
 151
 152 void
 153 nouveau_abi16_fini(struct nouveau_abi16 *abi16)
 154 {
 155         struct nouveau_cli *cli = (void *)abi16->device.object.client;
 156         struct nouveau_abi16_chan *chan, *temp;
 157
 158         /* cleanup channels */
 159         list_for_each_entry_safe(chan, temp, &abi16->channels, head) {
 160                 nouveau_abi16_chan_fini(abi16, chan);
 161         }
 162
 163         /* destroy the device object */
 164         nvif_device_fini(&abi16->device);
 165
 166         kfree(cli->abi16);
 167         cli->abi16 = NULL;
 168 }
 169
 170 int
 171 nouveau_abi16_ioctl_getparam(ABI16_IOCTL_ARGS)
 172 {
 173         struct nouveau_cli *cli = nouveau_cli(file_priv);
 174         struct nouveau_drm *drm = nouveau_drm(dev);
 175         struct nvif_device *device = &drm->device;
 176         struct nvkm_gr *gr = nvxx_gr(device);
 177         struct drm_nouveau_getparam *getparam = data;
 178
 179         switch (getparam->param) {
 180         case NOUVEAU_GETPARAM_CHIPSET_ID:
 181                 getparam->value = device->info.chipset;
 182                 break;
 183         case NOUVEAU_GETPARAM_PCI_VENDOR:
 184                 if (nvxx_device(device)->func->pci)
 185                         getparam->value = dev->pdev->vendor;
 186                 else
 187                         getparam->value = 0;
 188                 break;
 189         case NOUVEAU_GETPARAM_PCI_DEVICE:
 190                 if (nvxx_device(device)->func->pci)
 191                         getparam->value = dev->pdev->device;
 192                 else
 193                         getparam->value = 0;
 194                 break;
 195         case NOUVEAU_GETPARAM_BUS_TYPE:
 196                 if (!nvxx_device(device)->func->pci)
 197                         getparam->value = 3;
 198                 else
 199                 if (drm_pci_device_is_agp(dev))
 200                         getparam->value = 0;
 201                 else
 202                 if (!pci_is_pcie(dev->pdev))
 203                         getparam->value = 1;
 204                 else
 205                         getparam->value = 2;
 206                 break;
 207         case NOUVEAU_GETPARAM_FB_SIZE:
 208                 getparam->value = drm->gem.vram_available;
 209                 break;
 210         case NOUVEAU_GETPARAM_AGP_SIZE:
 211                 getparam->value = drm->gem.gart_available;
 212                 break;
 213         case NOUVEAU_GETPARAM_VM_VRAM_BASE:
 214                 getparam->value = 0; /* deprecated */
 215                 break;
 216         case NOUVEAU_GETPARAM_PTIMER_TIME:
 217                 getparam->value = nvif_device_time(device);
 218                 break;
 219         case NOUVEAU_GETPARAM_HAS_BO_USAGE:
 220                 getparam->value = 1;
 221                 break;
 222         case NOUVEAU_GETPARAM_HAS_PAGEFLIP:
 223                 getparam->value = 1;
 224                 break;
 225         case NOUVEAU_GETPARAM_GRAPH_UNITS:
 226                 getparam->value = nvkm_gr_units(gr);
 227                 break;
 228         default:
 229                 NV_PRINTK(dbg, cli, "unknown parameter %lld\n", getparam->param);
 230                 return -EINVAL;
 231         }
 232
 233         return 0;
 234 }
 235
 236 int
 237 nouveau_abi16_ioctl_setparam(ABI16_IOCTL_ARGS)
 238 {
 239         return -EINVAL;
 240 }
 241
 242 int
 243 nouveau_abi16_ioctl_channel_alloc(ABI16_IOCTL_ARGS)
 244 {
 245         struct drm_nouveau_channel_alloc *init = data;
 246         struct nouveau_cli *cli = nouveau_cli(file_priv);
 247         struct nouveau_drm *drm = nouveau_drm(dev);
 248         struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
 249         struct nouveau_abi16_chan *chan;
 250         struct nvif_device *device;
 251         int ret;
 252
 253         if (unlikely(!abi16))
 254                 return -ENOMEM;
 255
 256         if (!drm->channel)
 257                 return nouveau_abi16_put(abi16, -ENODEV);
 258
 259         device = &abi16->device;
 260
 261         /* hack to allow channel engine type specification on kepler */
 262         if (device->info.family >= NV_DEVICE_INFO_V0_KEPLER) {
 263                 if (init->fb_ctxdma_handle != ~0)
 264                         init->fb_ctxdma_handle = KEPLER_CHANNEL_GPFIFO_A_V0_ENGINE_GR;
 265                 else
 266                         init->fb_ctxdma_handle = init->tt_ctxdma_handle;
 267
 268                 /* allow flips to be executed if this is a graphics channel */
 269                 init->tt_ctxdma_handle = 0;
 270                 if (init->fb_ctxdma_handle == KEPLER_CHANNEL_GPFIFO_A_V0_ENGINE_GR)
 271                         init->tt_ctxdma_handle = 1;
 272         }
 273
 274         if (init->fb_ctxdma_handle == ~0 || init->tt_ctxdma_handle == ~0)
 275                 return nouveau_abi16_put(abi16, -EINVAL);
 276
 277         /* allocate "abi16 channel" data and make up a handle for it */
 278         chan = kzalloc(sizeof(*chan), GFP_KERNEL);
 279         if (!chan)
 280                 return nouveau_abi16_put(abi16, -ENOMEM);
 281
 282         INIT_LIST_HEAD(&chan->notifiers);
 283         list_add(&chan->head, &abi16->channels);
 284
 285         /* create channel object and initialise dma and fence management */
 286         ret = nouveau_channel_new(drm, device, init->fb_ctxdma_handle,
 287                                   init->tt_ctxdma_handle, &chan->chan);
 288         if (ret)
 289                 goto done;
 290
 291         init->channel = chan->chan->chid;
 292
 293         if (device->info.family >= NV_DEVICE_INFO_V0_TESLA)
 294                 init->pushbuf_domains = NOUVEAU_GEM_DOMAIN_VRAM |
 295                                         NOUVEAU_GEM_DOMAIN_GART;
 296         else
 297         if (chan->chan->push.buffer->bo.mem.mem_type == TTM_PL_VRAM)
 298                 init->pushbuf_domains = NOUVEAU_GEM_DOMAIN_VRAM;
 299         else
 300                 init->pushbuf_domains = NOUVEAU_GEM_DOMAIN_GART;
 301
 302         if (device->info.family < NV_DEVICE_INFO_V0_CELSIUS) {
 303                 init->subchan[0].handle = 0x00000000;
 304                 init->subchan[0].grclass = 0x0000;
 305                 init->subchan[1].handle = chan->chan->nvsw.handle;
 306                 init->subchan[1].grclass = 0x506e;
 307                 init->nr_subchan = 2;
 308         }
 309
 310         /* Named memory object area */
 311         ret = nouveau_gem_new(dev, PAGE_SIZE, 0, NOUVEAU_GEM_DOMAIN_GART,
 312                               0, 0, &chan->ntfy);
 313         if (ret == 0)
 314                 ret = nouveau_bo_pin(chan->ntfy, TTM_PL_FLAG_TT, false);
 315         if (ret)
 316                 goto done;
 317
 318         if (device->info.family >= NV_DEVICE_INFO_V0_TESLA) {
 319                 ret = nouveau_bo_vma_add(chan->ntfy, cli->vm,
 320                                         &chan->ntfy_vma);
 321                 if (ret)
 322                         goto done;
 323         }
 324
 325         ret = drm_gem_handle_create(file_priv, &chan->ntfy->gem,
 326                                     &init->notifier_handle);
 327         if (ret)
 328                 goto done;
 329
 330         ret = nvkm_mm_init(&chan->heap, 0, PAGE_SIZE, 1);
 331 done:
 332         if (ret)
 333                 nouveau_abi16_chan_fini(abi16, chan);
 334         return nouveau_abi16_put(abi16, ret);
 335 }
 336
 337 static struct nouveau_abi16_chan *
 338 nouveau_abi16_chan(struct nouveau_abi16 *abi16, int channel)
 339 {
 340         struct nouveau_abi16_chan *chan;
 341
 342         list_for_each_entry(chan, &abi16->channels, head) {
 343                 if (chan->chan->chid == channel)
 344                         return chan;
 345         }
 346
 347         return NULL;
 348 }
 349
 350 int
 351 nouveau_abi16_usif(struct drm_file *file_priv, void *data, u32 size)
 352 {
 353         union {
 354                 struct nvif_ioctl_v0 v0;
 355         } *args = data;
 356         struct nouveau_abi16_chan *chan;
 357         struct nouveau_abi16 *abi16;
 358         int ret;
 359
 360         if (nvif_unpack(args->v0, 0, 0, true)) {
 361                 switch (args->v0.type) {
 362                 case NVIF_IOCTL_V0_NEW:
 363                 case NVIF_IOCTL_V0_MTHD:
 364                 case NVIF_IOCTL_V0_SCLASS:
 365                         break;
 366                 default:
 367                         return -EACCES;
 368                 }
 369         } else
 370                 return ret;
 371
 372         if (!(abi16 = nouveau_abi16(file_priv)))
 373                 return -ENOMEM;
 374
 375         if (args->v0.token != ~0ULL) {
 376                 if (!(chan = nouveau_abi16_chan(abi16, args->v0.token)))
 377                         return -EINVAL;
 378                 args->v0.object = nvif_handle(&chan->chan->user);
 379                 args->v0.owner  = NVIF_IOCTL_V0_OWNER_ANY;
 380                 return 0;
 381         }
 382
 383         args->v0.object = nvif_handle(&abi16->device.object);
 384         args->v0.owner  = NVIF_IOCTL_V0_OWNER_ANY;
 385         return 0;
 386 }
 387
 388 int
 389 nouveau_abi16_ioctl_channel_free(ABI16_IOCTL_ARGS)
 390 {
 391         struct drm_nouveau_channel_free *req = data;
 392         struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
 393         struct nouveau_abi16_chan *chan;
 394
 395         if (unlikely(!abi16))
 396                 return -ENOMEM;
 397
 398         chan = nouveau_abi16_chan(abi16, req->channel);
 399         if (!chan)
 400                 return nouveau_abi16_put(abi16, -ENOENT);
 401         nouveau_abi16_chan_fini(abi16, chan);
 402         return nouveau_abi16_put(abi16, 0);
 403 }
 404
 405 int
 406 nouveau_abi16_ioctl_grobj_alloc(ABI16_IOCTL_ARGS)
 407 {
 408         struct drm_nouveau_grobj_alloc *init = data;
 409         struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
 410         struct nouveau_abi16_chan *chan;
 411         struct nouveau_abi16_ntfy *ntfy;
 412         struct nvif_client *client;
 413         struct nvif_sclass *sclass;
 414         s32 oclass = 0;
 415         int ret, i;
 416
 417         if (unlikely(!abi16))
 418                 return -ENOMEM;
 419
 420         if (init->handle == ~0)
 421                 return nouveau_abi16_put(abi16, -EINVAL);
 422         client = abi16->device.object.client;
 423
 424         chan = nouveau_abi16_chan(abi16, init->channel);
 425         if (!chan)
 426                 return nouveau_abi16_put(abi16, -ENOENT);
 427
 428         ret = nvif_object_sclass_get(&chan->chan->user, &sclass);
 429         if (ret < 0)
 430                 return nouveau_abi16_put(abi16, ret);
 431
 432         if ((init->class & 0x00ff) == 0x006e) {
 433                 /* nvsw: compatibility with older 0x*6e class identifier */
 434                 for (i = 0; !oclass && i < ret; i++) {
 435                         switch (sclass[i].oclass) {
 436                         case NVIF_IOCTL_NEW_V0_SW_NV04:
 437                         case NVIF_IOCTL_NEW_V0_SW_NV10:
 438                         case NVIF_IOCTL_NEW_V0_SW_NV50:
 439                         case NVIF_IOCTL_NEW_V0_SW_GF100:
 440                                 oclass = sclass[i].oclass;
 441                                 break;
 442                         default:
 443                                 break;
 444                         }
 445                 }
 446         } else
 447         if ((init->class & 0x00ff) == 0x00b1) {
 448                 /* msvld: compatibility with incorrect version exposure */
 449                 for (i = 0; i < ret; i++) {
 450                         if ((sclass[i].oclass & 0x00ff) == 0x00b1) {
 451                                 oclass = sclass[i].oclass;
 452                                 break;
 453                         }
 454                 }
 455         } else
 456         if ((init->class & 0x00ff) == 0x00b2) { /* mspdec */
 457                 /* mspdec: compatibility with incorrect version exposure */
 458                 for (i = 0; i < ret; i++) {
 459                         if ((sclass[i].oclass & 0x00ff) == 0x00b2) {
 460                                 oclass = sclass[i].oclass;
 461                                 break;
 462                         }
 463                 }
 464         } else
 465         if ((init->class & 0x00ff) == 0x00b3) { /* msppp */
 466                 /* msppp: compatibility with incorrect version exposure */
 467                 for (i = 0; i < ret; i++) {
 468                         if ((sclass[i].oclass & 0x00ff) == 0x00b3) {
 469                                 oclass = sclass[i].oclass;
 470                                 break;
 471                         }
 472                 }
 473         } else {
 474                 oclass = init->class;
 475         }
 476
 477         nvif_object_sclass_put(&sclass);
 478         if (!oclass)
 479                 return nouveau_abi16_put(abi16, -EINVAL);
 480
 481         ntfy = kzalloc(sizeof(*ntfy), GFP_KERNEL);
 482         if (!ntfy)
 483                 return nouveau_abi16_put(abi16, -ENOMEM);
 484
 485         list_add(&ntfy->head, &chan->notifiers);
 486
 487         client->route = NVDRM_OBJECT_ABI16;
 488         ret = nvif_object_init(&chan->chan->user, init->handle, oclass,
 489                                NULL, 0, &ntfy->object);
 490         client->route = NVDRM_OBJECT_NVIF;
 491
 492         if (ret)
 493                 nouveau_abi16_ntfy_fini(chan, ntfy);
 494         return nouveau_abi16_put(abi16, ret);
 495 }
 496
 497 int
 498 nouveau_abi16_ioctl_notifierobj_alloc(ABI16_IOCTL_ARGS)
 499 {
 500         struct drm_nouveau_notifierobj_alloc *info = data;
 501         struct nouveau_drm *drm = nouveau_drm(dev);
 502         struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
 503         struct nouveau_abi16_chan *chan;
 504         struct nouveau_abi16_ntfy *ntfy;
 505         struct nvif_device *device = &abi16->device;
 506         struct nvif_client *client;
 507         struct nv_dma_v0 args = {};
 508         int ret;
 509
 510         if (unlikely(!abi16))
 511                 return -ENOMEM;
 512
 513         /* completely unnecessary for these chipsets... */
 514         if (unlikely(device->info.family >= NV_DEVICE_INFO_V0_FERMI))
 515                 return nouveau_abi16_put(abi16, -EINVAL);
 516         client = abi16->device.object.client;
 517
 518         chan = nouveau_abi16_chan(abi16, info->channel);
 519         if (!chan)
 520                 return nouveau_abi16_put(abi16, -ENOENT);
 521
 522         ntfy = kzalloc(sizeof(*ntfy), GFP_KERNEL);
 523         if (!ntfy)
 524                 return nouveau_abi16_put(abi16, -ENOMEM);
 525
 526         list_add(&ntfy->head, &chan->notifiers);
 527
 528         ret = nvkm_mm_head(&chan->heap, 0, 1, info->size, info->size, 1,
 529                            &ntfy->node);
 530         if (ret)
 531                 goto done;
 532
 533         args.start = ntfy->node->offset;
 534         args.limit = ntfy->node->offset + ntfy->node->length - 1;
 535         if (device->info.family >= NV_DEVICE_INFO_V0_TESLA) {
 536                 args.target = NV_DMA_V0_TARGET_VM;
 537                 args.access = NV_DMA_V0_ACCESS_VM;
 538                 args.start += chan->ntfy_vma.offset;
 539                 args.limit += chan->ntfy_vma.offset;
 540         } else
 541         if (drm->agp.bridge) {
 542                 args.target = NV_DMA_V0_TARGET_AGP;
 543                 args.access = NV_DMA_V0_ACCESS_RDWR;
 544                 args.start += drm->agp.base + chan->ntfy->bo.offset;
 545                 args.limit += drm->agp.base + chan->ntfy->bo.offset;
 546         } else {
 547                 args.target = NV_DMA_V0_TARGET_VM;
 548                 args.access = NV_DMA_V0_ACCESS_RDWR;
 549                 args.start += chan->ntfy->bo.offset;
 550                 args.limit += chan->ntfy->bo.offset;
 551         }
 552
 553         client->route = NVDRM_OBJECT_ABI16;
 554         client->super = true;
 555         ret = nvif_object_init(&chan->chan->user, info->handle,
 556                                NV_DMA_IN_MEMORY, &args, sizeof(args),
 557                                &ntfy->object);
 558         client->super = false;
 559         client->route = NVDRM_OBJECT_NVIF;
 560         if (ret)
 561                 goto done;
 562
 563         info->offset = ntfy->node->offset;
 564 done:
 565         if (ret)
 566                 nouveau_abi16_ntfy_fini(chan, ntfy);
 567         return nouveau_abi16_put(abi16, ret);
 568 }
 569
 570 int
 571 nouveau_abi16_ioctl_gpuobj_free(ABI16_IOCTL_ARGS)
 572 {
 573         struct drm_nouveau_gpuobj_free *fini = data;
 574         struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
 575         struct nouveau_abi16_chan *chan;
 576         struct nouveau_abi16_ntfy *ntfy;
 577         int ret = -ENOENT;
 578
 579         if (unlikely(!abi16))
 580                 return -ENOMEM;
 581
 582         chan = nouveau_abi16_chan(abi16, fini->channel);
 583         if (!chan)
 584                 return nouveau_abi16_put(abi16, -EINVAL);
 585
 586         /* synchronize with the user channel and destroy the gpu object */
 587         nouveau_channel_idle(chan->chan);
 588
 589         list_for_each_entry(ntfy, &chan->notifiers, head) {
 590                 if (ntfy->object.handle == fini->handle) {
 591                         nouveau_abi16_ntfy_fini(chan, ntfy);
 592                         ret = 0;
 593                         break;
 594                 }
 595         }
 596
 597         return nouveau_abi16_put(abi16, ret);
 598 }