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_drv.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->client.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         case NV_DEVICE_INFO_V0_PASCAL:
 104                 return NVIF_CLASS_SW_GF100;
 105         }
 106
 107         return 0x0000;
 108 }
 109
 110 static void
 111 nouveau_abi16_ntfy_fini(struct nouveau_abi16_chan *chan,
 112                         struct nouveau_abi16_ntfy *ntfy)
 113 {
 114         nvif_object_fini(&ntfy->object);
 115         nvkm_mm_free(&chan->heap, &ntfy->node);
 116         list_del(&ntfy->head);
 117         kfree(ntfy);
 118 }
 119
 120 static void
 121 nouveau_abi16_chan_fini(struct nouveau_abi16 *abi16,
 122                         struct nouveau_abi16_chan *chan)
 123 {
 124         struct nouveau_abi16_ntfy *ntfy, *temp;
 125
 126         /* wait for all activity to stop before releasing notify object, which
 127          * may be still in use */
 128         if (chan->chan && chan->ntfy)
 129                 nouveau_channel_idle(chan->chan);
 130
 131         /* cleanup notifier state */
 132         list_for_each_entry_safe(ntfy, temp, &chan->notifiers, head) {
 133                 nouveau_abi16_ntfy_fini(chan, ntfy);
 134         }
 135
 136         if (chan->ntfy) {
 137                 nouveau_bo_vma_del(chan->ntfy, &chan->ntfy_vma);
 138                 nouveau_bo_unpin(chan->ntfy);
 139                 drm_gem_object_unreference_unlocked(&chan->ntfy->gem);
 140         }
 141
 142         if (chan->heap.block_size)
 143                 nvkm_mm_fini(&chan->heap);
 144
 145         /* destroy channel object, all children will be killed too */
 146         if (chan->chan) {
 147                 nouveau_channel_idle(chan->chan);
 148                 nouveau_channel_del(&chan->chan);
 149         }
 150
 151         list_del(&chan->head);
 152         kfree(chan);
 153 }
 154
 155 void
 156 nouveau_abi16_fini(struct nouveau_abi16 *abi16)
 157 {
 158         struct nouveau_cli *cli = (void *)abi16->device.object.client;
 159         struct nouveau_abi16_chan *chan, *temp;
 160
 161         /* cleanup channels */
 162         list_for_each_entry_safe(chan, temp, &abi16->channels, head) {
 163                 nouveau_abi16_chan_fini(abi16, chan);
 164         }
 165
 166         /* destroy the device object */
 167         nvif_device_fini(&abi16->device);
 168
 169         kfree(cli->abi16);
 170         cli->abi16 = NULL;
 171 }
 172
 173 int
 174 nouveau_abi16_ioctl_getparam(ABI16_IOCTL_ARGS)
 175 {
 176         struct nouveau_cli *cli = nouveau_cli(file_priv);
 177         struct nouveau_drm *drm = nouveau_drm(dev);
 178         struct nvif_device *device = &drm->client.device;
 179         struct nvkm_gr *gr = nvxx_gr(device);
 180         struct drm_nouveau_getparam *getparam = data;
 181
 182         switch (getparam->param) {
 183         case NOUVEAU_GETPARAM_CHIPSET_ID:
 184                 getparam->value = device->info.chipset;
 185                 break;
 186         case NOUVEAU_GETPARAM_PCI_VENDOR:
 187                 if (nvxx_device(device)->func->pci)
 188                         getparam->value = dev->pdev->vendor;
 189                 else
 190                         getparam->value = 0;
 191                 break;
 192         case NOUVEAU_GETPARAM_PCI_DEVICE:
 193                 if (nvxx_device(device)->func->pci)
 194                         getparam->value = dev->pdev->device;
 195                 else
 196                         getparam->value = 0;
 197                 break;
 198         case NOUVEAU_GETPARAM_BUS_TYPE:
 199                 if (!nvxx_device(device)->func->pci)
 200                         getparam->value = 3;
 201                 else
 202                 if (pci_find_capability(dev->pdev, PCI_CAP_ID_AGP))
 203                         getparam->value = 0;
 204                 else
 205                 if (!pci_is_pcie(dev->pdev))
 206                         getparam->value = 1;
 207                 else
 208                         getparam->value = 2;
 209                 break;
 210         case NOUVEAU_GETPARAM_FB_SIZE:
 211                 getparam->value = drm->gem.vram_available;
 212                 break;
 213         case NOUVEAU_GETPARAM_AGP_SIZE:
 214                 getparam->value = drm->gem.gart_available;
 215                 break;
 216         case NOUVEAU_GETPARAM_VM_VRAM_BASE:
 217                 getparam->value = 0; /* deprecated */
 218                 break;
 219         case NOUVEAU_GETPARAM_PTIMER_TIME:
 220                 getparam->value = nvif_device_time(device);
 221                 break;
 222         case NOUVEAU_GETPARAM_HAS_BO_USAGE:
 223                 getparam->value = 1;
 224                 break;
 225         case NOUVEAU_GETPARAM_HAS_PAGEFLIP:
 226                 getparam->value = 1;
 227                 break;
 228         case NOUVEAU_GETPARAM_GRAPH_UNITS:
 229                 getparam->value = nvkm_gr_units(gr);
 230                 break;
 231         default:
 232                 NV_PRINTK(dbg, cli, "unknown parameter %lld\n", getparam->param);
 233                 return -EINVAL;
 234         }
 235
 236         return 0;
 237 }
 238
 239 int
 240 nouveau_abi16_ioctl_setparam(ABI16_IOCTL_ARGS)
 241 {
 242         return -EINVAL;
 243 }
 244
 245 int
 246 nouveau_abi16_ioctl_channel_alloc(ABI16_IOCTL_ARGS)
 247 {
 248         struct drm_nouveau_channel_alloc *init = data;
 249         struct nouveau_cli *cli = nouveau_cli(file_priv);
 250         struct nouveau_drm *drm = nouveau_drm(dev);
 251         struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
 252         struct nouveau_abi16_chan *chan;
 253         struct nvif_device *device;
 254         int ret;
 255
 256         if (unlikely(!abi16))
 257                 return -ENOMEM;
 258
 259         if (!drm->channel)
 260                 return nouveau_abi16_put(abi16, -ENODEV);
 261
 262         device = &abi16->device;
 263
 264         /* hack to allow channel engine type specification on kepler */
 265         if (device->info.family >= NV_DEVICE_INFO_V0_KEPLER) {
 266                 if (init->fb_ctxdma_handle != ~0)
 267                         init->fb_ctxdma_handle = NVA06F_V0_ENGINE_GR;
 268                 else {
 269                         init->fb_ctxdma_handle = 0;
 270 #define _(A,B) if (init->tt_ctxdma_handle & (A)) init->fb_ctxdma_handle |= (B)
 271                         _(0x01, NVA06F_V0_ENGINE_GR);
 272                         _(0x02, NVA06F_V0_ENGINE_MSPDEC);
 273                         _(0x04, NVA06F_V0_ENGINE_MSPPP);
 274                         _(0x08, NVA06F_V0_ENGINE_MSVLD);
 275                         _(0x10, NVA06F_V0_ENGINE_CE0);
 276                         _(0x20, NVA06F_V0_ENGINE_CE1);
 277                         _(0x40, NVA06F_V0_ENGINE_MSENC);
 278 #undef _
 279                 }
 280
 281                 /* allow flips to be executed if this is a graphics channel */
 282                 init->tt_ctxdma_handle = 0;
 283                 if (init->fb_ctxdma_handle == NVA06F_V0_ENGINE_GR)
 284                         init->tt_ctxdma_handle = 1;
 285         }
 286
 287         if (init->fb_ctxdma_handle == ~0 || init->tt_ctxdma_handle == ~0)
 288                 return nouveau_abi16_put(abi16, -EINVAL);
 289
 290         /* allocate "abi16 channel" data and make up a handle for it */
 291         chan = kzalloc(sizeof(*chan), GFP_KERNEL);
 292         if (!chan)
 293                 return nouveau_abi16_put(abi16, -ENOMEM);
 294
 295         INIT_LIST_HEAD(&chan->notifiers);
 296         list_add(&chan->head, &abi16->channels);
 297
 298         /* create channel object and initialise dma and fence management */
 299         ret = nouveau_channel_new(drm, device, init->fb_ctxdma_handle,
 300                                   init->tt_ctxdma_handle, &chan->chan);
 301         if (ret)
 302                 goto done;
 303
 304         init->channel = chan->chan->chid;
 305
 306         if (device->info.family >= NV_DEVICE_INFO_V0_TESLA)
 307                 init->pushbuf_domains = NOUVEAU_GEM_DOMAIN_VRAM |
 308                                         NOUVEAU_GEM_DOMAIN_GART;
 309         else
 310         if (chan->chan->push.buffer->bo.mem.mem_type == TTM_PL_VRAM)
 311                 init->pushbuf_domains = NOUVEAU_GEM_DOMAIN_VRAM;
 312         else
 313                 init->pushbuf_domains = NOUVEAU_GEM_DOMAIN_GART;
 314
 315         if (device->info.family < NV_DEVICE_INFO_V0_CELSIUS) {
 316                 init->subchan[0].handle = 0x00000000;
 317                 init->subchan[0].grclass = 0x0000;
 318                 init->subchan[1].handle = chan->chan->nvsw.handle;
 319                 init->subchan[1].grclass = 0x506e;
 320                 init->nr_subchan = 2;
 321         }
 322
 323         /* Named memory object area */
 324         ret = nouveau_gem_new(cli, PAGE_SIZE, 0, NOUVEAU_GEM_DOMAIN_GART,
 325                               0, 0, &chan->ntfy);
 326         if (ret == 0)
 327                 ret = nouveau_bo_pin(chan->ntfy, TTM_PL_FLAG_TT, false);
 328         if (ret)
 329                 goto done;
 330
 331         if (device->info.family >= NV_DEVICE_INFO_V0_TESLA) {
 332                 ret = nouveau_bo_vma_add(chan->ntfy, cli->vm,
 333                                         &chan->ntfy_vma);
 334                 if (ret)
 335                         goto done;
 336         }
 337
 338         ret = drm_gem_handle_create(file_priv, &chan->ntfy->gem,
 339                                     &init->notifier_handle);
 340         if (ret)
 341                 goto done;
 342
 343         ret = nvkm_mm_init(&chan->heap, 0, PAGE_SIZE, 1);
 344 done:
 345         if (ret)
 346                 nouveau_abi16_chan_fini(abi16, chan);
 347         return nouveau_abi16_put(abi16, ret);
 348 }
 349
 350 static struct nouveau_abi16_chan *
 351 nouveau_abi16_chan(struct nouveau_abi16 *abi16, int channel)
 352 {
 353         struct nouveau_abi16_chan *chan;
 354
 355         list_for_each_entry(chan, &abi16->channels, head) {
 356                 if (chan->chan->chid == channel)
 357                         return chan;
 358         }
 359
 360         return NULL;
 361 }
 362
 363 int
 364 nouveau_abi16_usif(struct drm_file *file_priv, void *data, u32 size)
 365 {
 366         union {
 367                 struct nvif_ioctl_v0 v0;
 368         } *args = data;
 369         struct nouveau_abi16_chan *chan;
 370         struct nouveau_abi16 *abi16;
 371         int ret = -ENOSYS;
 372
 373         if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
 374                 switch (args->v0.type) {
 375                 case NVIF_IOCTL_V0_NEW:
 376                 case NVIF_IOCTL_V0_MTHD:
 377                 case NVIF_IOCTL_V0_SCLASS:
 378                         break;
 379                 default:
 380                         return -EACCES;
 381                 }
 382         } else
 383                 return ret;
 384
 385         if (!(abi16 = nouveau_abi16(file_priv)))
 386                 return -ENOMEM;
 387
 388         if (args->v0.token != ~0ULL) {
 389                 if (!(chan = nouveau_abi16_chan(abi16, args->v0.token)))
 390                         return -EINVAL;
 391                 args->v0.object = nvif_handle(&chan->chan->user);
 392                 args->v0.owner  = NVIF_IOCTL_V0_OWNER_ANY;
 393                 return 0;
 394         }
 395
 396         args->v0.object = nvif_handle(&abi16->device.object);
 397         args->v0.owner  = NVIF_IOCTL_V0_OWNER_ANY;
 398         return 0;
 399 }
 400
 401 int
 402 nouveau_abi16_ioctl_channel_free(ABI16_IOCTL_ARGS)
 403 {
 404         struct drm_nouveau_channel_free *req = data;
 405         struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
 406         struct nouveau_abi16_chan *chan;
 407
 408         if (unlikely(!abi16))
 409                 return -ENOMEM;
 410
 411         chan = nouveau_abi16_chan(abi16, req->channel);
 412         if (!chan)
 413                 return nouveau_abi16_put(abi16, -ENOENT);
 414         nouveau_abi16_chan_fini(abi16, chan);
 415         return nouveau_abi16_put(abi16, 0);
 416 }
 417
 418 int
 419 nouveau_abi16_ioctl_grobj_alloc(ABI16_IOCTL_ARGS)
 420 {
 421         struct drm_nouveau_grobj_alloc *init = data;
 422         struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
 423         struct nouveau_abi16_chan *chan;
 424         struct nouveau_abi16_ntfy *ntfy;
 425         struct nvif_client *client;
 426         struct nvif_sclass *sclass;
 427         s32 oclass = 0;
 428         int ret, i;
 429
 430         if (unlikely(!abi16))
 431                 return -ENOMEM;
 432
 433         if (init->handle == ~0)
 434                 return nouveau_abi16_put(abi16, -EINVAL);
 435         client = abi16->device.object.client;
 436
 437         chan = nouveau_abi16_chan(abi16, init->channel);
 438         if (!chan)
 439                 return nouveau_abi16_put(abi16, -ENOENT);
 440
 441         ret = nvif_object_sclass_get(&chan->chan->user, &sclass);
 442         if (ret < 0)
 443                 return nouveau_abi16_put(abi16, ret);
 444
 445         if ((init->class & 0x00ff) == 0x006e) {
 446                 /* nvsw: compatibility with older 0x*6e class identifier */
 447                 for (i = 0; !oclass && i < ret; i++) {
 448                         switch (sclass[i].oclass) {
 449                         case NVIF_CLASS_SW_NV04:
 450                         case NVIF_CLASS_SW_NV10:
 451                         case NVIF_CLASS_SW_NV50:
 452                         case NVIF_CLASS_SW_GF100:
 453                                 oclass = sclass[i].oclass;
 454                                 break;
 455                         default:
 456                                 break;
 457                         }
 458                 }
 459         } else
 460         if ((init->class & 0x00ff) == 0x00b1) {
 461                 /* msvld: compatibility with incorrect version exposure */
 462                 for (i = 0; i < ret; i++) {
 463                         if ((sclass[i].oclass & 0x00ff) == 0x00b1) {
 464                                 oclass = sclass[i].oclass;
 465                                 break;
 466                         }
 467                 }
 468         } else
 469         if ((init->class & 0x00ff) == 0x00b2) { /* mspdec */
 470                 /* mspdec: compatibility with incorrect version exposure */
 471                 for (i = 0; i < ret; i++) {
 472                         if ((sclass[i].oclass & 0x00ff) == 0x00b2) {
 473                                 oclass = sclass[i].oclass;
 474                                 break;
 475                         }
 476                 }
 477         } else
 478         if ((init->class & 0x00ff) == 0x00b3) { /* msppp */
 479                 /* msppp: compatibility with incorrect version exposure */
 480                 for (i = 0; i < ret; i++) {
 481                         if ((sclass[i].oclass & 0x00ff) == 0x00b3) {
 482                                 oclass = sclass[i].oclass;
 483                                 break;
 484                         }
 485                 }
 486         } else {
 487                 oclass = init->class;
 488         }
 489
 490         nvif_object_sclass_put(&sclass);
 491         if (!oclass)
 492                 return nouveau_abi16_put(abi16, -EINVAL);
 493
 494         ntfy = kzalloc(sizeof(*ntfy), GFP_KERNEL);
 495         if (!ntfy)
 496                 return nouveau_abi16_put(abi16, -ENOMEM);
 497
 498         list_add(&ntfy->head, &chan->notifiers);
 499
 500         client->route = NVDRM_OBJECT_ABI16;
 501         ret = nvif_object_init(&chan->chan->user, init->handle, oclass,
 502                                NULL, 0, &ntfy->object);
 503         client->route = NVDRM_OBJECT_NVIF;
 504
 505         if (ret)
 506                 nouveau_abi16_ntfy_fini(chan, ntfy);
 507         return nouveau_abi16_put(abi16, ret);
 508 }
 509
 510 int
 511 nouveau_abi16_ioctl_notifierobj_alloc(ABI16_IOCTL_ARGS)
 512 {
 513         struct drm_nouveau_notifierobj_alloc *info = data;
 514         struct nouveau_drm *drm = nouveau_drm(dev);
 515         struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
 516         struct nouveau_abi16_chan *chan;
 517         struct nouveau_abi16_ntfy *ntfy;
 518         struct nvif_device *device = &abi16->device;
 519         struct nvif_client *client;
 520         struct nv_dma_v0 args = {};
 521         int ret;
 522
 523         if (unlikely(!abi16))
 524                 return -ENOMEM;
 525
 526         /* completely unnecessary for these chipsets... */
 527         if (unlikely(device->info.family >= NV_DEVICE_INFO_V0_FERMI))
 528                 return nouveau_abi16_put(abi16, -EINVAL);
 529         client = abi16->device.object.client;
 530
 531         chan = nouveau_abi16_chan(abi16, info->channel);
 532         if (!chan)
 533                 return nouveau_abi16_put(abi16, -ENOENT);
 534
 535         ntfy = kzalloc(sizeof(*ntfy), GFP_KERNEL);
 536         if (!ntfy)
 537                 return nouveau_abi16_put(abi16, -ENOMEM);
 538
 539         list_add(&ntfy->head, &chan->notifiers);
 540
 541         ret = nvkm_mm_head(&chan->heap, 0, 1, info->size, info->size, 1,
 542                            &ntfy->node);
 543         if (ret)
 544                 goto done;
 545
 546         args.start = ntfy->node->offset;
 547         args.limit = ntfy->node->offset + ntfy->node->length - 1;
 548         if (device->info.family >= NV_DEVICE_INFO_V0_TESLA) {
 549                 args.target = NV_DMA_V0_TARGET_VM;
 550                 args.access = NV_DMA_V0_ACCESS_VM;
 551                 args.start += chan->ntfy_vma.offset;
 552                 args.limit += chan->ntfy_vma.offset;
 553         } else
 554         if (drm->agp.bridge) {
 555                 args.target = NV_DMA_V0_TARGET_AGP;
 556                 args.access = NV_DMA_V0_ACCESS_RDWR;
 557                 args.start += drm->agp.base + chan->ntfy->bo.offset;
 558                 args.limit += drm->agp.base + chan->ntfy->bo.offset;
 559         } else {
 560                 args.target = NV_DMA_V0_TARGET_VM;
 561                 args.access = NV_DMA_V0_ACCESS_RDWR;
 562                 args.start += chan->ntfy->bo.offset;
 563                 args.limit += chan->ntfy->bo.offset;
 564         }
 565
 566         client->route = NVDRM_OBJECT_ABI16;
 567         client->super = true;
 568         ret = nvif_object_init(&chan->chan->user, info->handle,
 569                                NV_DMA_IN_MEMORY, &args, sizeof(args),
 570                                &ntfy->object);
 571         client->super = false;
 572         client->route = NVDRM_OBJECT_NVIF;
 573         if (ret)
 574                 goto done;
 575
 576         info->offset = ntfy->node->offset;
 577 done:
 578         if (ret)
 579                 nouveau_abi16_ntfy_fini(chan, ntfy);
 580         return nouveau_abi16_put(abi16, ret);
 581 }
 582
 583 int
 584 nouveau_abi16_ioctl_gpuobj_free(ABI16_IOCTL_ARGS)
 585 {
 586         struct drm_nouveau_gpuobj_free *fini = data;
 587         struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
 588         struct nouveau_abi16_chan *chan;
 589         struct nouveau_abi16_ntfy *ntfy;
 590         int ret = -ENOENT;
 591
 592         if (unlikely(!abi16))
 593                 return -ENOMEM;
 594
 595         chan = nouveau_abi16_chan(abi16, fini->channel);
 596         if (!chan)
 597                 return nouveau_abi16_put(abi16, -EINVAL);
 598
 599         /* synchronize with the user channel and destroy the gpu object */
 600         nouveau_channel_idle(chan->chan);
 601
 602         list_for_each_entry(ntfy, &chan->notifiers, head) {
 603                 if (ntfy->object.handle == fini->handle) {
 604                         nouveau_abi16_ntfy_fini(chan, ntfy);
 605                         ret = 0;
 606                         break;
 607                 }
 608         }
 609
 610         return nouveau_abi16_put(abi16, ret);
 611 }