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/cl0002.h>
  29 #include <nvif/cla06f.h>
  30 #include <nvif/unpack.h>
  31
  32 #include "nouveau_drm.h"
  33 #include "nouveau_dma.h"
  34 #include "nouveau_gem.h"
  35 #include "nouveau_chan.h"
  36 #include "nouveau_abi16.h"
  37
  38 static struct nouveau_abi16 *
  39 nouveau_abi16(struct drm_file *file_priv)
  40 {
  41         struct nouveau_cli *cli = nouveau_cli(file_priv);
  42         if (!cli->abi16) {
  43                 struct nouveau_abi16 *abi16;
  44                 cli->abi16 = abi16 = kzalloc(sizeof(*abi16), GFP_KERNEL);
  45                 if (cli->abi16) {
  46                         struct nv_device_v0 args = {
  47                                 .device = ~0ULL,
  48                         };
  49
  50                         INIT_LIST_HEAD(&abi16->channels);
  51
  52                         /* allocate device object targeting client's default
  53                          * device (ie. the one that belongs to the fd it
  54                          * opened)
  55                          */
  56                         if (nvif_device_init(&cli->base.object, 0, NV_DEVICE,
  57                                              &args, sizeof(args),
  58                                              &abi16->device) == 0)
  59                                 return cli->abi16;
  60
  61                         kfree(cli->abi16);
  62                         cli->abi16 = NULL;
  63                 }
  64         }
  65         return cli->abi16;
  66 }
  67
  68 struct nouveau_abi16 *
  69 nouveau_abi16_get(struct drm_file *file_priv)
  70 {
  71         struct nouveau_cli *cli = nouveau_cli(file_priv);
  72         mutex_lock(&cli->mutex);
  73         if (nouveau_abi16(file_priv))
  74                 return cli->abi16;
  75         mutex_unlock(&cli->mutex);
  76         return NULL;
  77 }
  78
  79 int
  80 nouveau_abi16_put(struct nouveau_abi16 *abi16, int ret)
  81 {
  82         struct nouveau_cli *cli = (void *)abi16->device.object.client;
  83         mutex_unlock(&cli->mutex);
  84         return ret;
  85 }
  86
  87 s32
  88 nouveau_abi16_swclass(struct nouveau_drm *drm)
  89 {
  90         switch (drm->device.info.family) {
  91         case NV_DEVICE_INFO_V0_TNT:
  92                 return NVIF_CLASS_SW_NV04;
  93         case NV_DEVICE_INFO_V0_CELSIUS:
  94         case NV_DEVICE_INFO_V0_KELVIN:
  95         case NV_DEVICE_INFO_V0_RANKINE:
  96         case NV_DEVICE_INFO_V0_CURIE:
  97                 return NVIF_CLASS_SW_NV10;
  98         case NV_DEVICE_INFO_V0_TESLA:
  99                 return NVIF_CLASS_SW_NV50;
 100         case NV_DEVICE_INFO_V0_FERMI:
 101         case NV_DEVICE_INFO_V0_KEPLER:
 102         case NV_DEVICE_INFO_V0_MAXWELL:
 103                 return NVIF_CLASS_SW_GF100;
 104         }
 105
 106         return 0x0000;
 107 }
 108
 109 static void
 110 nouveau_abi16_ntfy_fini(struct nouveau_abi16_chan *chan,
 111                         struct nouveau_abi16_ntfy *ntfy)
 112 {
 113         nvif_object_fini(&ntfy->object);
 114         nvkm_mm_free(&chan->heap, &ntfy->node);
 115         list_del(&ntfy->head);
 116         kfree(ntfy);
 117 }
 118
 119 static void
 120 nouveau_abi16_chan_fini(struct nouveau_abi16 *abi16,
 121                         struct nouveau_abi16_chan *chan)
 122 {
 123         struct nouveau_abi16_ntfy *ntfy, *temp;
 124
 125         /* wait for all activity to stop before releasing notify object, which
 126          * may be still in use */
 127         if (chan->chan && chan->ntfy)
 128                 nouveau_channel_idle(chan->chan);
 129
 130         /* cleanup notifier state */
 131         list_for_each_entry_safe(ntfy, temp, &chan->notifiers, head) {
 132                 nouveau_abi16_ntfy_fini(chan, ntfy);
 133         }
 134
 135         if (chan->ntfy) {
 136                 nouveau_bo_vma_del(chan->ntfy, &chan->ntfy_vma);
 137                 nouveau_bo_unpin(chan->ntfy);
 138                 drm_gem_object_unreference_unlocked(&chan->ntfy->gem);
 139         }
 140
 141         if (chan->heap.block_size)
 142                 nvkm_mm_fini(&chan->heap);
 143
 144         /* destroy channel object, all children will be killed too */
 145         if (chan->chan) {
 146                 nouveau_channel_idle(chan->chan);
 147                 nouveau_channel_del(&chan->chan);
 148         }
 149
 150         list_del(&chan->head);
 151         kfree(chan);
 152 }
 153
 154 void
 155 nouveau_abi16_fini(struct nouveau_abi16 *abi16)
 156 {
 157         struct nouveau_cli *cli = (void *)abi16->device.object.client;
 158         struct nouveau_abi16_chan *chan, *temp;
 159
 160         /* cleanup channels */
 161         list_for_each_entry_safe(chan, temp, &abi16->channels, head) {
 162                 nouveau_abi16_chan_fini(abi16, chan);
 163         }
 164
 165         /* destroy the device object */
 166         nvif_device_fini(&abi16->device);
 167
 168         kfree(cli->abi16);
 169         cli->abi16 = NULL;
 170 }
 171
 172 int
 173 nouveau_abi16_ioctl_getparam(ABI16_IOCTL_ARGS)
 174 {
 175         struct nouveau_cli *cli = nouveau_cli(file_priv);
 176         struct nouveau_drm *drm = nouveau_drm(dev);
 177         struct nvif_device *device = &drm->device;
 178         struct nvkm_gr *gr = nvxx_gr(device);
 179         struct drm_nouveau_getparam *getparam = data;
 180
 181         switch (getparam->param) {
 182         case NOUVEAU_GETPARAM_CHIPSET_ID:
 183                 getparam->value = device->info.chipset;
 184                 break;
 185         case NOUVEAU_GETPARAM_PCI_VENDOR:
 186                 if (nvxx_device(device)->func->pci)
 187                         getparam->value = dev->pdev->vendor;
 188                 else
 189                         getparam->value = 0;
 190                 break;
 191         case NOUVEAU_GETPARAM_PCI_DEVICE:
 192                 if (nvxx_device(device)->func->pci)
 193                         getparam->value = dev->pdev->device;
 194                 else
 195                         getparam->value = 0;
 196                 break;
 197         case NOUVEAU_GETPARAM_BUS_TYPE:
 198                 if (!nvxx_device(device)->func->pci)
 199                         getparam->value = 3;
 200                 else
 201                 if (drm_pci_device_is_agp(dev))
 202                         getparam->value = 0;
 203                 else
 204                 if (!pci_is_pcie(dev->pdev))
 205                         getparam->value = 1;
 206                 else
 207                         getparam->value = 2;
 208                 break;
 209         case NOUVEAU_GETPARAM_FB_SIZE:
 210                 getparam->value = drm->gem.vram_available;
 211                 break;
 212         case NOUVEAU_GETPARAM_AGP_SIZE:
 213                 getparam->value = drm->gem.gart_available;
 214                 break;
 215         case NOUVEAU_GETPARAM_VM_VRAM_BASE:
 216                 getparam->value = 0; /* deprecated */
 217                 break;
 218         case NOUVEAU_GETPARAM_PTIMER_TIME:
 219                 getparam->value = nvif_device_time(device);
 220                 break;
 221         case NOUVEAU_GETPARAM_HAS_BO_USAGE:
 222                 getparam->value = 1;
 223                 break;
 224         case NOUVEAU_GETPARAM_HAS_PAGEFLIP:
 225                 getparam->value = 1;
 226                 break;
 227         case NOUVEAU_GETPARAM_GRAPH_UNITS:
 228                 getparam->value = nvkm_gr_units(gr);
 229                 break;
 230         default:
 231                 NV_PRINTK(dbg, cli, "unknown parameter %lld\n", getparam->param);
 232                 return -EINVAL;
 233         }
 234
 235         return 0;
 236 }
 237
 238 int
 239 nouveau_abi16_ioctl_setparam(ABI16_IOCTL_ARGS)
 240 {
 241         return -EINVAL;
 242 }
 243
 244 int
 245 nouveau_abi16_ioctl_channel_alloc(ABI16_IOCTL_ARGS)
 246 {
 247         struct drm_nouveau_channel_alloc *init = data;
 248         struct nouveau_cli *cli = nouveau_cli(file_priv);
 249         struct nouveau_drm *drm = nouveau_drm(dev);
 250         struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
 251         struct nouveau_abi16_chan *chan;
 252         struct nvif_device *device;
 253         int ret;
 254
 255         if (unlikely(!abi16))
 256                 return -ENOMEM;
 257
 258         if (!drm->channel)
 259                 return nouveau_abi16_put(abi16, -ENODEV);
 260
 261         device = &abi16->device;
 262
 263         /* hack to allow channel engine type specification on kepler */
 264         if (device->info.family >= NV_DEVICE_INFO_V0_KEPLER) {
 265                 if (init->fb_ctxdma_handle != ~0)
 266                         init->fb_ctxdma_handle = KEPLER_CHANNEL_GPFIFO_A_V0_ENGINE_GR;
 267                 else
 268                         init->fb_ctxdma_handle = init->tt_ctxdma_handle;
 269
 270                 /* allow flips to be executed if this is a graphics channel */
 271                 init->tt_ctxdma_handle = 0;
 272                 if (init->fb_ctxdma_handle == KEPLER_CHANNEL_GPFIFO_A_V0_ENGINE_GR)
 273                         init->tt_ctxdma_handle = 1;
 274         }
 275
 276         if (init->fb_ctxdma_handle == ~0 || init->tt_ctxdma_handle == ~0)
 277                 return nouveau_abi16_put(abi16, -EINVAL);
 278
 279         /* allocate "abi16 channel" data and make up a handle for it */
 280         chan = kzalloc(sizeof(*chan), GFP_KERNEL);
 281         if (!chan)
 282                 return nouveau_abi16_put(abi16, -ENOMEM);
 283
 284         INIT_LIST_HEAD(&chan->notifiers);
 285         list_add(&chan->head, &abi16->channels);
 286
 287         /* create channel object and initialise dma and fence management */
 288         ret = nouveau_channel_new(drm, device, init->fb_ctxdma_handle,
 289                                   init->tt_ctxdma_handle, &chan->chan);
 290         if (ret)
 291                 goto done;
 292
 293         init->channel = chan->chan->chid;
 294
 295         if (device->info.family >= NV_DEVICE_INFO_V0_TESLA)
 296                 init->pushbuf_domains = NOUVEAU_GEM_DOMAIN_VRAM |
 297                                         NOUVEAU_GEM_DOMAIN_GART;
 298         else
 299         if (chan->chan->push.buffer->bo.mem.mem_type == TTM_PL_VRAM)
 300                 init->pushbuf_domains = NOUVEAU_GEM_DOMAIN_VRAM;
 301         else
 302                 init->pushbuf_domains = NOUVEAU_GEM_DOMAIN_GART;
 303
 304         if (device->info.family < NV_DEVICE_INFO_V0_CELSIUS) {
 305                 init->subchan[0].handle = 0x00000000;
 306                 init->subchan[0].grclass = 0x0000;
 307                 init->subchan[1].handle = chan->chan->nvsw.handle;
 308                 init->subchan[1].grclass = 0x506e;
 309                 init->nr_subchan = 2;
 310         }
 311
 312         /* Named memory object area */
 313         ret = nouveau_gem_new(dev, PAGE_SIZE, 0, NOUVEAU_GEM_DOMAIN_GART,
 314                               0, 0, &chan->ntfy);
 315         if (ret == 0)
 316                 ret = nouveau_bo_pin(chan->ntfy, TTM_PL_FLAG_TT, false);
 317         if (ret)
 318                 goto done;
 319
 320         if (device->info.family >= NV_DEVICE_INFO_V0_TESLA) {
 321                 ret = nouveau_bo_vma_add(chan->ntfy, cli->vm,
 322                                         &chan->ntfy_vma);
 323                 if (ret)
 324                         goto done;
 325         }
 326
 327         ret = drm_gem_handle_create(file_priv, &chan->ntfy->gem,
 328                                     &init->notifier_handle);
 329         if (ret)
 330                 goto done;
 331
 332         ret = nvkm_mm_init(&chan->heap, 0, PAGE_SIZE, 1);
 333 done:
 334         if (ret)
 335                 nouveau_abi16_chan_fini(abi16, chan);
 336         return nouveau_abi16_put(abi16, ret);
 337 }
 338
 339 static struct nouveau_abi16_chan *
 340 nouveau_abi16_chan(struct nouveau_abi16 *abi16, int channel)
 341 {
 342         struct nouveau_abi16_chan *chan;
 343
 344         list_for_each_entry(chan, &abi16->channels, head) {
 345                 if (chan->chan->chid == channel)
 346                         return chan;
 347         }
 348
 349         return NULL;
 350 }
 351
 352 int
 353 nouveau_abi16_usif(struct drm_file *file_priv, void *data, u32 size)
 354 {
 355         union {
 356                 struct nvif_ioctl_v0 v0;
 357         } *args = data;
 358         struct nouveau_abi16_chan *chan;
 359         struct nouveau_abi16 *abi16;
 360         int ret = -ENOSYS;
 361
 362         if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
 363                 switch (args->v0.type) {
 364                 case NVIF_IOCTL_V0_NEW:
 365                 case NVIF_IOCTL_V0_MTHD:
 366                 case NVIF_IOCTL_V0_SCLASS:
 367                         break;
 368                 default:
 369                         return -EACCES;
 370                 }
 371         } else
 372                 return ret;
 373
 374         if (!(abi16 = nouveau_abi16(file_priv)))
 375                 return -ENOMEM;
 376
 377         if (args->v0.token != ~0ULL) {
 378                 if (!(chan = nouveau_abi16_chan(abi16, args->v0.token)))
 379                         return -EINVAL;
 380                 args->v0.object = nvif_handle(&chan->chan->user);
 381                 args->v0.owner  = NVIF_IOCTL_V0_OWNER_ANY;
 382                 return 0;
 383         }
 384
 385         args->v0.object = nvif_handle(&abi16->device.object);
 386         args->v0.owner  = NVIF_IOCTL_V0_OWNER_ANY;
 387         return 0;
 388 }
 389
 390 int
 391 nouveau_abi16_ioctl_channel_free(ABI16_IOCTL_ARGS)
 392 {
 393         struct drm_nouveau_channel_free *req = data;
 394         struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
 395         struct nouveau_abi16_chan *chan;
 396
 397         if (unlikely(!abi16))
 398                 return -ENOMEM;
 399
 400         chan = nouveau_abi16_chan(abi16, req->channel);
 401         if (!chan)
 402                 return nouveau_abi16_put(abi16, -ENOENT);
 403         nouveau_abi16_chan_fini(abi16, chan);
 404         return nouveau_abi16_put(abi16, 0);
 405 }
 406
 407 int
 408 nouveau_abi16_ioctl_grobj_alloc(ABI16_IOCTL_ARGS)
 409 {
 410         struct drm_nouveau_grobj_alloc *init = data;
 411         struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
 412         struct nouveau_abi16_chan *chan;
 413         struct nouveau_abi16_ntfy *ntfy;
 414         struct nvif_client *client;
 415         struct nvif_sclass *sclass;
 416         s32 oclass = 0;
 417         int ret, i;
 418
 419         if (unlikely(!abi16))
 420                 return -ENOMEM;
 421
 422         if (init->handle == ~0)
 423                 return nouveau_abi16_put(abi16, -EINVAL);
 424         client = abi16->device.object.client;
 425
 426         chan = nouveau_abi16_chan(abi16, init->channel);
 427         if (!chan)
 428                 return nouveau_abi16_put(abi16, -ENOENT);
 429
 430         ret = nvif_object_sclass_get(&chan->chan->user, &sclass);
 431         if (ret < 0)
 432                 return nouveau_abi16_put(abi16, ret);
 433
 434         if ((init->class & 0x00ff) == 0x006e) {
 435                 /* nvsw: compatibility with older 0x*6e class identifier */
 436                 for (i = 0; !oclass && i < ret; i++) {
 437                         switch (sclass[i].oclass) {
 438                         case NVIF_CLASS_SW_NV04:
 439                         case NVIF_CLASS_SW_NV10:
 440                         case NVIF_CLASS_SW_NV50:
 441                         case NVIF_CLASS_SW_GF100:
 442                                 oclass = sclass[i].oclass;
 443                                 break;
 444                         default:
 445                                 break;
 446                         }
 447                 }
 448         } else
 449         if ((init->class & 0x00ff) == 0x00b1) {
 450                 /* msvld: compatibility with incorrect version exposure */
 451                 for (i = 0; i < ret; i++) {
 452                         if ((sclass[i].oclass & 0x00ff) == 0x00b1) {
 453                                 oclass = sclass[i].oclass;
 454                                 break;
 455                         }
 456                 }
 457         } else
 458         if ((init->class & 0x00ff) == 0x00b2) { /* mspdec */
 459                 /* mspdec: compatibility with incorrect version exposure */
 460                 for (i = 0; i < ret; i++) {
 461                         if ((sclass[i].oclass & 0x00ff) == 0x00b2) {
 462                                 oclass = sclass[i].oclass;
 463                                 break;
 464                         }
 465                 }
 466         } else
 467         if ((init->class & 0x00ff) == 0x00b3) { /* msppp */
 468                 /* msppp: compatibility with incorrect version exposure */
 469                 for (i = 0; i < ret; i++) {
 470                         if ((sclass[i].oclass & 0x00ff) == 0x00b3) {
 471                                 oclass = sclass[i].oclass;
 472                                 break;
 473                         }
 474                 }
 475         } else {
 476                 oclass = init->class;
 477         }
 478
 479         nvif_object_sclass_put(&sclass);
 480         if (!oclass)
 481                 return nouveau_abi16_put(abi16, -EINVAL);
 482
 483         ntfy = kzalloc(sizeof(*ntfy), GFP_KERNEL);
 484         if (!ntfy)
 485                 return nouveau_abi16_put(abi16, -ENOMEM);
 486
 487         list_add(&ntfy->head, &chan->notifiers);
 488
 489         client->route = NVDRM_OBJECT_ABI16;
 490         ret = nvif_object_init(&chan->chan->user, init->handle, oclass,
 491                                NULL, 0, &ntfy->object);
 492         client->route = NVDRM_OBJECT_NVIF;
 493
 494         if (ret)
 495                 nouveau_abi16_ntfy_fini(chan, ntfy);
 496         return nouveau_abi16_put(abi16, ret);
 497 }
 498
 499 int
 500 nouveau_abi16_ioctl_notifierobj_alloc(ABI16_IOCTL_ARGS)
 501 {
 502         struct drm_nouveau_notifierobj_alloc *info = data;
 503         struct nouveau_drm *drm = nouveau_drm(dev);
 504         struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
 505         struct nouveau_abi16_chan *chan;
 506         struct nouveau_abi16_ntfy *ntfy;
 507         struct nvif_device *device = &abi16->device;
 508         struct nvif_client *client;
 509         struct nv_dma_v0 args = {};
 510         int ret;
 511
 512         if (unlikely(!abi16))
 513                 return -ENOMEM;
 514
 515         /* completely unnecessary for these chipsets... */
 516         if (unlikely(device->info.family >= NV_DEVICE_INFO_V0_FERMI))
 517                 return nouveau_abi16_put(abi16, -EINVAL);
 518         client = abi16->device.object.client;
 519
 520         chan = nouveau_abi16_chan(abi16, info->channel);
 521         if (!chan)
 522                 return nouveau_abi16_put(abi16, -ENOENT);
 523
 524         ntfy = kzalloc(sizeof(*ntfy), GFP_KERNEL);
 525         if (!ntfy)
 526                 return nouveau_abi16_put(abi16, -ENOMEM);
 527
 528         list_add(&ntfy->head, &chan->notifiers);
 529
 530         ret = nvkm_mm_head(&chan->heap, 0, 1, info->size, info->size, 1,
 531                            &ntfy->node);
 532         if (ret)
 533                 goto done;
 534
 535         args.start = ntfy->node->offset;
 536         args.limit = ntfy->node->offset + ntfy->node->length - 1;
 537         if (device->info.family >= NV_DEVICE_INFO_V0_TESLA) {
 538                 args.target = NV_DMA_V0_TARGET_VM;
 539                 args.access = NV_DMA_V0_ACCESS_VM;
 540                 args.start += chan->ntfy_vma.offset;
 541                 args.limit += chan->ntfy_vma.offset;
 542         } else
 543         if (drm->agp.bridge) {
 544                 args.target = NV_DMA_V0_TARGET_AGP;
 545                 args.access = NV_DMA_V0_ACCESS_RDWR;
 546                 args.start += drm->agp.base + chan->ntfy->bo.offset;
 547                 args.limit += drm->agp.base + chan->ntfy->bo.offset;
 548         } else {
 549                 args.target = NV_DMA_V0_TARGET_VM;
 550                 args.access = NV_DMA_V0_ACCESS_RDWR;
 551                 args.start += chan->ntfy->bo.offset;
 552                 args.limit += chan->ntfy->bo.offset;
 553         }
 554
 555         client->route = NVDRM_OBJECT_ABI16;
 556         client->super = true;
 557         ret = nvif_object_init(&chan->chan->user, info->handle,
 558                                NV_DMA_IN_MEMORY, &args, sizeof(args),
 559                                &ntfy->object);
 560         client->super = false;
 561         client->route = NVDRM_OBJECT_NVIF;
 562         if (ret)
 563                 goto done;
 564
 565         info->offset = ntfy->node->offset;
 566 done:
 567         if (ret)
 568                 nouveau_abi16_ntfy_fini(chan, ntfy);
 569         return nouveau_abi16_put(abi16, ret);
 570 }
 571
 572 int
 573 nouveau_abi16_ioctl_gpuobj_free(ABI16_IOCTL_ARGS)
 574 {
 575         struct drm_nouveau_gpuobj_free *fini = data;
 576         struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
 577         struct nouveau_abi16_chan *chan;
 578         struct nouveau_abi16_ntfy *ntfy;
 579         int ret = -ENOENT;
 580
 581         if (unlikely(!abi16))
 582                 return -ENOMEM;
 583
 584         chan = nouveau_abi16_chan(abi16, fini->channel);
 585         if (!chan)
 586                 return nouveau_abi16_put(abi16, -EINVAL);
 587
 588         /* synchronize with the user channel and destroy the gpu object */
 589         nouveau_channel_idle(chan->chan);
 590
 591         list_for_each_entry(ntfy, &chan->notifiers, head) {
 592                 if (ntfy->object.handle == fini->handle) {
 593                         nouveau_abi16_ntfy_fini(chan, ntfy);
 594                         ret = 0;
 595                         break;
 596                 }
 597         }
 598
 599         return nouveau_abi16_put(abi16, ret);
 600 }