linux/drivers/gpu/drm/nouveau/nouveau_abi16.c
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   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/fifo.h>
  27#include <nvif/ioctl.h>
  28#include <nvif/class.h>
  29#include <nvif/cl0002.h>
  30#include <nvif/cla06f.h>
  31#include <nvif/unpack.h>
  32
  33#include "nouveau_drv.h"
  34#include "nouveau_dma.h"
  35#include "nouveau_gem.h"
  36#include "nouveau_chan.h"
  37#include "nouveau_abi16.h"
  38#include "nouveau_vmm.h"
  39
  40static struct nouveau_abi16 *
  41nouveau_abi16(struct drm_file *file_priv)
  42{
  43        struct nouveau_cli *cli = nouveau_cli(file_priv);
  44        if (!cli->abi16) {
  45                struct nouveau_abi16 *abi16;
  46                cli->abi16 = abi16 = kzalloc(sizeof(*abi16), GFP_KERNEL);
  47                if (cli->abi16) {
  48                        struct nv_device_v0 args = {
  49                                .device = ~0ULL,
  50                        };
  51
  52                        INIT_LIST_HEAD(&abi16->channels);
  53
  54                        /* allocate device object targeting client's default
  55                         * device (ie. the one that belongs to the fd it
  56                         * opened)
  57                         */
  58                        if (nvif_device_ctor(&cli->base.object, "abi16Device",
  59                                             0, NV_DEVICE, &args, sizeof(args),
  60                                             &abi16->device) == 0)
  61                                return cli->abi16;
  62
  63                        kfree(cli->abi16);
  64                        cli->abi16 = NULL;
  65                }
  66        }
  67        return cli->abi16;
  68}
  69
  70struct nouveau_abi16 *
  71nouveau_abi16_get(struct drm_file *file_priv)
  72{
  73        struct nouveau_cli *cli = nouveau_cli(file_priv);
  74        mutex_lock(&cli->mutex);
  75        if (nouveau_abi16(file_priv))
  76                return cli->abi16;
  77        mutex_unlock(&cli->mutex);
  78        return NULL;
  79}
  80
  81int
  82nouveau_abi16_put(struct nouveau_abi16 *abi16, int ret)
  83{
  84        struct nouveau_cli *cli = (void *)abi16->device.object.client;
  85        mutex_unlock(&cli->mutex);
  86        return ret;
  87}
  88
  89s32
  90nouveau_abi16_swclass(struct nouveau_drm *drm)
  91{
  92        switch (drm->client.device.info.family) {
  93        case NV_DEVICE_INFO_V0_TNT:
  94                return NVIF_CLASS_SW_NV04;
  95        case NV_DEVICE_INFO_V0_CELSIUS:
  96        case NV_DEVICE_INFO_V0_KELVIN:
  97        case NV_DEVICE_INFO_V0_RANKINE:
  98        case NV_DEVICE_INFO_V0_CURIE:
  99                return NVIF_CLASS_SW_NV10;
 100        case NV_DEVICE_INFO_V0_TESLA:
 101                return NVIF_CLASS_SW_NV50;
 102        case NV_DEVICE_INFO_V0_FERMI:
 103        case NV_DEVICE_INFO_V0_KEPLER:
 104        case NV_DEVICE_INFO_V0_MAXWELL:
 105        case NV_DEVICE_INFO_V0_PASCAL:
 106        case NV_DEVICE_INFO_V0_VOLTA:
 107                return NVIF_CLASS_SW_GF100;
 108        }
 109
 110        return 0x0000;
 111}
 112
 113static void
 114nouveau_abi16_ntfy_fini(struct nouveau_abi16_chan *chan,
 115                        struct nouveau_abi16_ntfy *ntfy)
 116{
 117        nvif_object_dtor(&ntfy->object);
 118        nvkm_mm_free(&chan->heap, &ntfy->node);
 119        list_del(&ntfy->head);
 120        kfree(ntfy);
 121}
 122
 123static void
 124nouveau_abi16_chan_fini(struct nouveau_abi16 *abi16,
 125                        struct nouveau_abi16_chan *chan)
 126{
 127        struct nouveau_abi16_ntfy *ntfy, *temp;
 128
 129        /* wait for all activity to stop before releasing notify object, which
 130         * may be still in use */
 131        if (chan->chan && chan->ntfy)
 132                nouveau_channel_idle(chan->chan);
 133
 134        /* cleanup notifier state */
 135        list_for_each_entry_safe(ntfy, temp, &chan->notifiers, head) {
 136                nouveau_abi16_ntfy_fini(chan, ntfy);
 137        }
 138
 139        if (chan->ntfy) {
 140                nouveau_vma_del(&chan->ntfy_vma);
 141                nouveau_bo_unpin(chan->ntfy);
 142                drm_gem_object_put(&chan->ntfy->bo.base);
 143        }
 144
 145        if (chan->heap.block_size)
 146                nvkm_mm_fini(&chan->heap);
 147
 148        /* destroy channel object, all children will be killed too */
 149        if (chan->chan) {
 150                nouveau_channel_idle(chan->chan);
 151                nouveau_channel_del(&chan->chan);
 152        }
 153
 154        list_del(&chan->head);
 155        kfree(chan);
 156}
 157
 158void
 159nouveau_abi16_fini(struct nouveau_abi16 *abi16)
 160{
 161        struct nouveau_cli *cli = (void *)abi16->device.object.client;
 162        struct nouveau_abi16_chan *chan, *temp;
 163
 164        /* cleanup channels */
 165        list_for_each_entry_safe(chan, temp, &abi16->channels, head) {
 166                nouveau_abi16_chan_fini(abi16, chan);
 167        }
 168
 169        /* destroy the device object */
 170        nvif_device_dtor(&abi16->device);
 171
 172        kfree(cli->abi16);
 173        cli->abi16 = NULL;
 174}
 175
 176int
 177nouveau_abi16_ioctl_getparam(ABI16_IOCTL_ARGS)
 178{
 179        struct nouveau_cli *cli = nouveau_cli(file_priv);
 180        struct nouveau_drm *drm = nouveau_drm(dev);
 181        struct nvif_device *device = &drm->client.device;
 182        struct nvkm_gr *gr = nvxx_gr(device);
 183        struct drm_nouveau_getparam *getparam = data;
 184
 185        switch (getparam->param) {
 186        case NOUVEAU_GETPARAM_CHIPSET_ID:
 187                getparam->value = device->info.chipset;
 188                break;
 189        case NOUVEAU_GETPARAM_PCI_VENDOR:
 190                if (device->info.platform != NV_DEVICE_INFO_V0_SOC)
 191                        getparam->value = dev->pdev->vendor;
 192                else
 193                        getparam->value = 0;
 194                break;
 195        case NOUVEAU_GETPARAM_PCI_DEVICE:
 196                if (device->info.platform != NV_DEVICE_INFO_V0_SOC)
 197                        getparam->value = dev->pdev->device;
 198                else
 199                        getparam->value = 0;
 200                break;
 201        case NOUVEAU_GETPARAM_BUS_TYPE:
 202                switch (device->info.platform) {
 203                case NV_DEVICE_INFO_V0_AGP : getparam->value = 0; break;
 204                case NV_DEVICE_INFO_V0_PCI : getparam->value = 1; break;
 205                case NV_DEVICE_INFO_V0_PCIE: getparam->value = 2; break;
 206                case NV_DEVICE_INFO_V0_SOC : getparam->value = 3; break;
 207                case NV_DEVICE_INFO_V0_IGP :
 208                        if (!pci_is_pcie(dev->pdev))
 209                                getparam->value = 1;
 210                        else
 211                                getparam->value = 2;
 212                        break;
 213                default:
 214                        WARN_ON(1);
 215                        break;
 216                }
 217                break;
 218        case NOUVEAU_GETPARAM_FB_SIZE:
 219                getparam->value = drm->gem.vram_available;
 220                break;
 221        case NOUVEAU_GETPARAM_AGP_SIZE:
 222                getparam->value = drm->gem.gart_available;
 223                break;
 224        case NOUVEAU_GETPARAM_VM_VRAM_BASE:
 225                getparam->value = 0; /* deprecated */
 226                break;
 227        case NOUVEAU_GETPARAM_PTIMER_TIME:
 228                getparam->value = nvif_device_time(device);
 229                break;
 230        case NOUVEAU_GETPARAM_HAS_BO_USAGE:
 231                getparam->value = 1;
 232                break;
 233        case NOUVEAU_GETPARAM_HAS_PAGEFLIP:
 234                getparam->value = 1;
 235                break;
 236        case NOUVEAU_GETPARAM_GRAPH_UNITS:
 237                getparam->value = nvkm_gr_units(gr);
 238                break;
 239        default:
 240                NV_PRINTK(dbg, cli, "unknown parameter %lld\n", getparam->param);
 241                return -EINVAL;
 242        }
 243
 244        return 0;
 245}
 246
 247int
 248nouveau_abi16_ioctl_channel_alloc(ABI16_IOCTL_ARGS)
 249{
 250        struct drm_nouveau_channel_alloc *init = data;
 251        struct nouveau_cli *cli = nouveau_cli(file_priv);
 252        struct nouveau_drm *drm = nouveau_drm(dev);
 253        struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
 254        struct nouveau_abi16_chan *chan;
 255        struct nvif_device *device;
 256        u64 engine;
 257        int ret;
 258
 259        if (unlikely(!abi16))
 260                return -ENOMEM;
 261
 262        if (!drm->channel)
 263                return nouveau_abi16_put(abi16, -ENODEV);
 264
 265        device = &abi16->device;
 266
 267        /* hack to allow channel engine type specification on kepler */
 268        if (device->info.family >= NV_DEVICE_INFO_V0_KEPLER) {
 269                if (init->fb_ctxdma_handle == ~0) {
 270                        switch (init->tt_ctxdma_handle) {
 271                        case 0x01: engine = NV_DEVICE_INFO_ENGINE_GR    ; break;
 272                        case 0x02: engine = NV_DEVICE_INFO_ENGINE_MSPDEC; break;
 273                        case 0x04: engine = NV_DEVICE_INFO_ENGINE_MSPPP ; break;
 274                        case 0x08: engine = NV_DEVICE_INFO_ENGINE_MSVLD ; break;
 275                        case 0x30: engine = NV_DEVICE_INFO_ENGINE_CE    ; break;
 276                        default:
 277                                return nouveau_abi16_put(abi16, -ENOSYS);
 278                        }
 279                } else {
 280                        engine = NV_DEVICE_INFO_ENGINE_GR;
 281                }
 282
 283                if (engine != NV_DEVICE_INFO_ENGINE_CE)
 284                        engine = nvif_fifo_runlist(device, engine);
 285                else
 286                        engine = nvif_fifo_runlist_ce(device);
 287                init->fb_ctxdma_handle = engine;
 288                init->tt_ctxdma_handle = 0;
 289        }
 290
 291        if (init->fb_ctxdma_handle == ~0 || init->tt_ctxdma_handle == ~0)
 292                return nouveau_abi16_put(abi16, -EINVAL);
 293
 294        /* allocate "abi16 channel" data and make up a handle for it */
 295        chan = kzalloc(sizeof(*chan), GFP_KERNEL);
 296        if (!chan)
 297                return nouveau_abi16_put(abi16, -ENOMEM);
 298
 299        INIT_LIST_HEAD(&chan->notifiers);
 300        list_add(&chan->head, &abi16->channels);
 301
 302        /* create channel object and initialise dma and fence management */
 303        ret = nouveau_channel_new(drm, device, init->fb_ctxdma_handle,
 304                                  init->tt_ctxdma_handle, false, &chan->chan);
 305        if (ret)
 306                goto done;
 307
 308        init->channel = chan->chan->chid;
 309
 310        if (device->info.family >= NV_DEVICE_INFO_V0_TESLA)
 311                init->pushbuf_domains = NOUVEAU_GEM_DOMAIN_VRAM |
 312                                        NOUVEAU_GEM_DOMAIN_GART;
 313        else
 314        if (chan->chan->push.buffer->bo.mem.mem_type == TTM_PL_VRAM)
 315                init->pushbuf_domains = NOUVEAU_GEM_DOMAIN_VRAM;
 316        else
 317                init->pushbuf_domains = NOUVEAU_GEM_DOMAIN_GART;
 318
 319        if (device->info.family < NV_DEVICE_INFO_V0_CELSIUS) {
 320                init->subchan[0].handle = 0x00000000;
 321                init->subchan[0].grclass = 0x0000;
 322                init->subchan[1].handle = chan->chan->nvsw.handle;
 323                init->subchan[1].grclass = 0x506e;
 324                init->nr_subchan = 2;
 325        }
 326
 327        /* Named memory object area */
 328        ret = nouveau_gem_new(cli, PAGE_SIZE, 0, NOUVEAU_GEM_DOMAIN_GART,
 329                              0, 0, &chan->ntfy);
 330        if (ret == 0)
 331                ret = nouveau_bo_pin(chan->ntfy, TTM_PL_FLAG_TT, false);
 332        if (ret)
 333                goto done;
 334
 335        if (device->info.family >= NV_DEVICE_INFO_V0_TESLA) {
 336                ret = nouveau_vma_new(chan->ntfy, chan->chan->vmm,
 337                                      &chan->ntfy_vma);
 338                if (ret)
 339                        goto done;
 340        }
 341
 342        ret = drm_gem_handle_create(file_priv, &chan->ntfy->bo.base,
 343                                    &init->notifier_handle);
 344        if (ret)
 345                goto done;
 346
 347        ret = nvkm_mm_init(&chan->heap, 0, 0, PAGE_SIZE, 1);
 348done:
 349        if (ret)
 350                nouveau_abi16_chan_fini(abi16, chan);
 351        return nouveau_abi16_put(abi16, ret);
 352}
 353
 354static struct nouveau_abi16_chan *
 355nouveau_abi16_chan(struct nouveau_abi16 *abi16, int channel)
 356{
 357        struct nouveau_abi16_chan *chan;
 358
 359        list_for_each_entry(chan, &abi16->channels, head) {
 360                if (chan->chan->chid == channel)
 361                        return chan;
 362        }
 363
 364        return NULL;
 365}
 366
 367int
 368nouveau_abi16_usif(struct drm_file *file_priv, void *data, u32 size)
 369{
 370        union {
 371                struct nvif_ioctl_v0 v0;
 372        } *args = data;
 373        struct nouveau_abi16_chan *chan;
 374        struct nouveau_abi16 *abi16;
 375        int ret = -ENOSYS;
 376
 377        if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
 378                switch (args->v0.type) {
 379                case NVIF_IOCTL_V0_NEW:
 380                case NVIF_IOCTL_V0_MTHD:
 381                case NVIF_IOCTL_V0_SCLASS:
 382                        break;
 383                default:
 384                        return -EACCES;
 385                }
 386        } else
 387                return ret;
 388
 389        if (!(abi16 = nouveau_abi16(file_priv)))
 390                return -ENOMEM;
 391
 392        if (args->v0.token != ~0ULL) {
 393                if (!(chan = nouveau_abi16_chan(abi16, args->v0.token)))
 394                        return -EINVAL;
 395                args->v0.object = nvif_handle(&chan->chan->user);
 396                args->v0.owner  = NVIF_IOCTL_V0_OWNER_ANY;
 397                return 0;
 398        }
 399
 400        args->v0.object = nvif_handle(&abi16->device.object);
 401        args->v0.owner  = NVIF_IOCTL_V0_OWNER_ANY;
 402        return 0;
 403}
 404
 405int
 406nouveau_abi16_ioctl_channel_free(ABI16_IOCTL_ARGS)
 407{
 408        struct drm_nouveau_channel_free *req = data;
 409        struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
 410        struct nouveau_abi16_chan *chan;
 411
 412        if (unlikely(!abi16))
 413                return -ENOMEM;
 414
 415        chan = nouveau_abi16_chan(abi16, req->channel);
 416        if (!chan)
 417                return nouveau_abi16_put(abi16, -ENOENT);
 418        nouveau_abi16_chan_fini(abi16, chan);
 419        return nouveau_abi16_put(abi16, 0);
 420}
 421
 422int
 423nouveau_abi16_ioctl_grobj_alloc(ABI16_IOCTL_ARGS)
 424{
 425        struct drm_nouveau_grobj_alloc *init = data;
 426        struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
 427        struct nouveau_abi16_chan *chan;
 428        struct nouveau_abi16_ntfy *ntfy;
 429        struct nvif_client *client;
 430        struct nvif_sclass *sclass;
 431        s32 oclass = 0;
 432        int ret, i;
 433
 434        if (unlikely(!abi16))
 435                return -ENOMEM;
 436
 437        if (init->handle == ~0)
 438                return nouveau_abi16_put(abi16, -EINVAL);
 439        client = abi16->device.object.client;
 440
 441        chan = nouveau_abi16_chan(abi16, init->channel);
 442        if (!chan)
 443                return nouveau_abi16_put(abi16, -ENOENT);
 444
 445        ret = nvif_object_sclass_get(&chan->chan->user, &sclass);
 446        if (ret < 0)
 447                return nouveau_abi16_put(abi16, ret);
 448
 449        if ((init->class & 0x00ff) == 0x006e) {
 450                /* nvsw: compatibility with older 0x*6e class identifier */
 451                for (i = 0; !oclass && i < ret; i++) {
 452                        switch (sclass[i].oclass) {
 453                        case NVIF_CLASS_SW_NV04:
 454                        case NVIF_CLASS_SW_NV10:
 455                        case NVIF_CLASS_SW_NV50:
 456                        case NVIF_CLASS_SW_GF100:
 457                                oclass = sclass[i].oclass;
 458                                break;
 459                        default:
 460                                break;
 461                        }
 462                }
 463        } else
 464        if ((init->class & 0x00ff) == 0x00b1) {
 465                /* msvld: compatibility with incorrect version exposure */
 466                for (i = 0; i < ret; i++) {
 467                        if ((sclass[i].oclass & 0x00ff) == 0x00b1) {
 468                                oclass = sclass[i].oclass;
 469                                break;
 470                        }
 471                }
 472        } else
 473        if ((init->class & 0x00ff) == 0x00b2) { /* mspdec */
 474                /* mspdec: compatibility with incorrect version exposure */
 475                for (i = 0; i < ret; i++) {
 476                        if ((sclass[i].oclass & 0x00ff) == 0x00b2) {
 477                                oclass = sclass[i].oclass;
 478                                break;
 479                        }
 480                }
 481        } else
 482        if ((init->class & 0x00ff) == 0x00b3) { /* msppp */
 483                /* msppp: compatibility with incorrect version exposure */
 484                for (i = 0; i < ret; i++) {
 485                        if ((sclass[i].oclass & 0x00ff) == 0x00b3) {
 486                                oclass = sclass[i].oclass;
 487                                break;
 488                        }
 489                }
 490        } else {
 491                oclass = init->class;
 492        }
 493
 494        nvif_object_sclass_put(&sclass);
 495        if (!oclass)
 496                return nouveau_abi16_put(abi16, -EINVAL);
 497
 498        ntfy = kzalloc(sizeof(*ntfy), GFP_KERNEL);
 499        if (!ntfy)
 500                return nouveau_abi16_put(abi16, -ENOMEM);
 501
 502        list_add(&ntfy->head, &chan->notifiers);
 503
 504        client->route = NVDRM_OBJECT_ABI16;
 505        ret = nvif_object_ctor(&chan->chan->user, "abi16EngObj", init->handle,
 506                               oclass, NULL, 0, &ntfy->object);
 507        client->route = NVDRM_OBJECT_NVIF;
 508
 509        if (ret)
 510                nouveau_abi16_ntfy_fini(chan, ntfy);
 511        return nouveau_abi16_put(abi16, ret);
 512}
 513
 514int
 515nouveau_abi16_ioctl_notifierobj_alloc(ABI16_IOCTL_ARGS)
 516{
 517        struct drm_nouveau_notifierobj_alloc *info = data;
 518        struct nouveau_drm *drm = nouveau_drm(dev);
 519        struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
 520        struct nouveau_abi16_chan *chan;
 521        struct nouveau_abi16_ntfy *ntfy;
 522        struct nvif_device *device = &abi16->device;
 523        struct nvif_client *client;
 524        struct nv_dma_v0 args = {};
 525        int ret;
 526
 527        if (unlikely(!abi16))
 528                return -ENOMEM;
 529
 530        /* completely unnecessary for these chipsets... */
 531        if (unlikely(device->info.family >= NV_DEVICE_INFO_V0_FERMI))
 532                return nouveau_abi16_put(abi16, -EINVAL);
 533        client = abi16->device.object.client;
 534
 535        chan = nouveau_abi16_chan(abi16, info->channel);
 536        if (!chan)
 537                return nouveau_abi16_put(abi16, -ENOENT);
 538
 539        ntfy = kzalloc(sizeof(*ntfy), GFP_KERNEL);
 540        if (!ntfy)
 541                return nouveau_abi16_put(abi16, -ENOMEM);
 542
 543        list_add(&ntfy->head, &chan->notifiers);
 544
 545        ret = nvkm_mm_head(&chan->heap, 0, 1, info->size, info->size, 1,
 546                           &ntfy->node);
 547        if (ret)
 548                goto done;
 549
 550        args.start = ntfy->node->offset;
 551        args.limit = ntfy->node->offset + ntfy->node->length - 1;
 552        if (device->info.family >= NV_DEVICE_INFO_V0_TESLA) {
 553                args.target = NV_DMA_V0_TARGET_VM;
 554                args.access = NV_DMA_V0_ACCESS_VM;
 555                args.start += chan->ntfy_vma->addr;
 556                args.limit += chan->ntfy_vma->addr;
 557        } else
 558        if (drm->agp.bridge) {
 559                args.target = NV_DMA_V0_TARGET_AGP;
 560                args.access = NV_DMA_V0_ACCESS_RDWR;
 561                args.start += drm->agp.base + chan->ntfy->offset;
 562                args.limit += drm->agp.base + chan->ntfy->offset;
 563        } else {
 564                args.target = NV_DMA_V0_TARGET_VM;
 565                args.access = NV_DMA_V0_ACCESS_RDWR;
 566                args.start += chan->ntfy->offset;
 567                args.limit += chan->ntfy->offset;
 568        }
 569
 570        client->route = NVDRM_OBJECT_ABI16;
 571        client->super = true;
 572        ret = nvif_object_ctor(&chan->chan->user, "abi16Ntfy", info->handle,
 573                               NV_DMA_IN_MEMORY, &args, sizeof(args),
 574                               &ntfy->object);
 575        client->super = false;
 576        client->route = NVDRM_OBJECT_NVIF;
 577        if (ret)
 578                goto done;
 579
 580        info->offset = ntfy->node->offset;
 581done:
 582        if (ret)
 583                nouveau_abi16_ntfy_fini(chan, ntfy);
 584        return nouveau_abi16_put(abi16, ret);
 585}
 586
 587int
 588nouveau_abi16_ioctl_gpuobj_free(ABI16_IOCTL_ARGS)
 589{
 590        struct drm_nouveau_gpuobj_free *fini = data;
 591        struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
 592        struct nouveau_abi16_chan *chan;
 593        struct nouveau_abi16_ntfy *ntfy;
 594        int ret = -ENOENT;
 595
 596        if (unlikely(!abi16))
 597                return -ENOMEM;
 598
 599        chan = nouveau_abi16_chan(abi16, fini->channel);
 600        if (!chan)
 601                return nouveau_abi16_put(abi16, -EINVAL);
 602
 603        /* synchronize with the user channel and destroy the gpu object */
 604        nouveau_channel_idle(chan->chan);
 605
 606        list_for_each_entry(ntfy, &chan->notifiers, head) {
 607                if (ntfy->object.handle == fini->handle) {
 608                        nouveau_abi16_ntfy_fini(chan, ntfy);
 609                        ret = 0;
 610                        break;
 611                }
 612        }
 613
 614        return nouveau_abi16_put(abi16, ret);
 615}
 616