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 
40 static struct nouveau_abi16 *
41 nouveau_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 
70 struct nouveau_abi16 *
71 nouveau_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 
81 int
82 nouveau_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 
89 s32
90 nouveau_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 
113 static void
114 nouveau_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 
123 static void
124 nouveau_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 
158 void
159 nouveau_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 
176 int
177 nouveau_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 	struct pci_dev *pdev = to_pci_dev(dev->dev);
185 
186 	switch (getparam->param) {
187 	case NOUVEAU_GETPARAM_CHIPSET_ID:
188 		getparam->value = device->info.chipset;
189 		break;
190 	case NOUVEAU_GETPARAM_PCI_VENDOR:
191 		if (device->info.platform != NV_DEVICE_INFO_V0_SOC)
192 			getparam->value = pdev->vendor;
193 		else
194 			getparam->value = 0;
195 		break;
196 	case NOUVEAU_GETPARAM_PCI_DEVICE:
197 		if (device->info.platform != NV_DEVICE_INFO_V0_SOC)
198 			getparam->value = pdev->device;
199 		else
200 			getparam->value = 0;
201 		break;
202 	case NOUVEAU_GETPARAM_BUS_TYPE:
203 		switch (device->info.platform) {
204 		case NV_DEVICE_INFO_V0_AGP : getparam->value = 0; break;
205 		case NV_DEVICE_INFO_V0_PCI : getparam->value = 1; break;
206 		case NV_DEVICE_INFO_V0_PCIE: getparam->value = 2; break;
207 		case NV_DEVICE_INFO_V0_SOC : getparam->value = 3; break;
208 		case NV_DEVICE_INFO_V0_IGP :
209 			if (!pci_is_pcie(pdev))
210 				getparam->value = 1;
211 			else
212 				getparam->value = 2;
213 			break;
214 		default:
215 			WARN_ON(1);
216 			break;
217 		}
218 		break;
219 	case NOUVEAU_GETPARAM_FB_SIZE:
220 		getparam->value = drm->gem.vram_available;
221 		break;
222 	case NOUVEAU_GETPARAM_AGP_SIZE:
223 		getparam->value = drm->gem.gart_available;
224 		break;
225 	case NOUVEAU_GETPARAM_VM_VRAM_BASE:
226 		getparam->value = 0; /* deprecated */
227 		break;
228 	case NOUVEAU_GETPARAM_PTIMER_TIME:
229 		getparam->value = nvif_device_time(device);
230 		break;
231 	case NOUVEAU_GETPARAM_HAS_BO_USAGE:
232 		getparam->value = 1;
233 		break;
234 	case NOUVEAU_GETPARAM_HAS_PAGEFLIP:
235 		getparam->value = 1;
236 		break;
237 	case NOUVEAU_GETPARAM_GRAPH_UNITS:
238 		getparam->value = nvkm_gr_units(gr);
239 		break;
240 	default:
241 		NV_PRINTK(dbg, cli, "unknown parameter %lld\n", getparam->param);
242 		return -EINVAL;
243 	}
244 
245 	return 0;
246 }
247 
248 int
249 nouveau_abi16_ioctl_channel_alloc(ABI16_IOCTL_ARGS)
250 {
251 	struct drm_nouveau_channel_alloc *init = data;
252 	struct nouveau_cli *cli = nouveau_cli(file_priv);
253 	struct nouveau_drm *drm = nouveau_drm(dev);
254 	struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
255 	struct nouveau_abi16_chan *chan;
256 	struct nvif_device *device;
257 	u64 engine;
258 	int ret;
259 
260 	if (unlikely(!abi16))
261 		return -ENOMEM;
262 
263 	if (!drm->channel)
264 		return nouveau_abi16_put(abi16, -ENODEV);
265 
266 	device = &abi16->device;
267 
268 	/* hack to allow channel engine type specification on kepler */
269 	if (device->info.family >= NV_DEVICE_INFO_V0_KEPLER) {
270 		if (init->fb_ctxdma_handle == ~0) {
271 			switch (init->tt_ctxdma_handle) {
272 			case 0x01: engine = NV_DEVICE_HOST_RUNLIST_ENGINES_GR    ; break;
273 			case 0x02: engine = NV_DEVICE_HOST_RUNLIST_ENGINES_MSPDEC; break;
274 			case 0x04: engine = NV_DEVICE_HOST_RUNLIST_ENGINES_MSPPP ; break;
275 			case 0x08: engine = NV_DEVICE_HOST_RUNLIST_ENGINES_MSVLD ; break;
276 			case 0x30: engine = NV_DEVICE_HOST_RUNLIST_ENGINES_CE    ; break;
277 			default:
278 				return nouveau_abi16_put(abi16, -ENOSYS);
279 			}
280 		} else {
281 			engine = NV_DEVICE_HOST_RUNLIST_ENGINES_GR;
282 		}
283 
284 		if (engine != NV_DEVICE_HOST_RUNLIST_ENGINES_CE)
285 			engine = nvif_fifo_runlist(device, engine);
286 		else
287 			engine = nvif_fifo_runlist_ce(device);
288 		init->fb_ctxdma_handle = engine;
289 		init->tt_ctxdma_handle = 0;
290 	}
291 
292 	if (init->fb_ctxdma_handle == ~0 || init->tt_ctxdma_handle == ~0)
293 		return nouveau_abi16_put(abi16, -EINVAL);
294 
295 	/* allocate "abi16 channel" data and make up a handle for it */
296 	chan = kzalloc(sizeof(*chan), GFP_KERNEL);
297 	if (!chan)
298 		return nouveau_abi16_put(abi16, -ENOMEM);
299 
300 	INIT_LIST_HEAD(&chan->notifiers);
301 	list_add(&chan->head, &abi16->channels);
302 
303 	/* create channel object and initialise dma and fence management */
304 	ret = nouveau_channel_new(drm, device, init->fb_ctxdma_handle,
305 				  init->tt_ctxdma_handle, false, &chan->chan);
306 	if (ret)
307 		goto done;
308 
309 	init->channel = chan->chan->chid;
310 
311 	if (device->info.family >= NV_DEVICE_INFO_V0_TESLA)
312 		init->pushbuf_domains = NOUVEAU_GEM_DOMAIN_VRAM |
313 					NOUVEAU_GEM_DOMAIN_GART;
314 	else
315 	if (chan->chan->push.buffer->bo.resource->mem_type == TTM_PL_VRAM)
316 		init->pushbuf_domains = NOUVEAU_GEM_DOMAIN_VRAM;
317 	else
318 		init->pushbuf_domains = NOUVEAU_GEM_DOMAIN_GART;
319 
320 	if (device->info.family < NV_DEVICE_INFO_V0_CELSIUS) {
321 		init->subchan[0].handle = 0x00000000;
322 		init->subchan[0].grclass = 0x0000;
323 		init->subchan[1].handle = chan->chan->nvsw.handle;
324 		init->subchan[1].grclass = 0x506e;
325 		init->nr_subchan = 2;
326 	}
327 
328 	/* Named memory object area */
329 	ret = nouveau_gem_new(cli, PAGE_SIZE, 0, NOUVEAU_GEM_DOMAIN_GART,
330 			      0, 0, &chan->ntfy);
331 	if (ret == 0)
332 		ret = nouveau_bo_pin(chan->ntfy, NOUVEAU_GEM_DOMAIN_GART,
333 				     false);
334 	if (ret)
335 		goto done;
336 
337 	if (device->info.family >= NV_DEVICE_INFO_V0_TESLA) {
338 		ret = nouveau_vma_new(chan->ntfy, chan->chan->vmm,
339 				      &chan->ntfy_vma);
340 		if (ret)
341 			goto done;
342 	}
343 
344 	ret = drm_gem_handle_create(file_priv, &chan->ntfy->bo.base,
345 				    &init->notifier_handle);
346 	if (ret)
347 		goto done;
348 
349 	ret = nvkm_mm_init(&chan->heap, 0, 0, PAGE_SIZE, 1);
350 done:
351 	if (ret)
352 		nouveau_abi16_chan_fini(abi16, chan);
353 	return nouveau_abi16_put(abi16, ret);
354 }
355 
356 static struct nouveau_abi16_chan *
357 nouveau_abi16_chan(struct nouveau_abi16 *abi16, int channel)
358 {
359 	struct nouveau_abi16_chan *chan;
360 
361 	list_for_each_entry(chan, &abi16->channels, head) {
362 		if (chan->chan->chid == channel)
363 			return chan;
364 	}
365 
366 	return NULL;
367 }
368 
369 int
370 nouveau_abi16_usif(struct drm_file *file_priv, void *data, u32 size)
371 {
372 	union {
373 		struct nvif_ioctl_v0 v0;
374 	} *args = data;
375 	struct nouveau_abi16_chan *chan;
376 	struct nouveau_abi16 *abi16;
377 	int ret = -ENOSYS;
378 
379 	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
380 		switch (args->v0.type) {
381 		case NVIF_IOCTL_V0_NEW:
382 		case NVIF_IOCTL_V0_MTHD:
383 		case NVIF_IOCTL_V0_SCLASS:
384 			break;
385 		default:
386 			return -EACCES;
387 		}
388 	} else
389 		return ret;
390 
391 	if (!(abi16 = nouveau_abi16(file_priv)))
392 		return -ENOMEM;
393 
394 	if (args->v0.token != ~0ULL) {
395 		if (!(chan = nouveau_abi16_chan(abi16, args->v0.token)))
396 			return -EINVAL;
397 		args->v0.object = nvif_handle(&chan->chan->user);
398 		args->v0.owner  = NVIF_IOCTL_V0_OWNER_ANY;
399 		return 0;
400 	}
401 
402 	args->v0.object = nvif_handle(&abi16->device.object);
403 	args->v0.owner  = NVIF_IOCTL_V0_OWNER_ANY;
404 	return 0;
405 }
406 
407 int
408 nouveau_abi16_ioctl_channel_free(ABI16_IOCTL_ARGS)
409 {
410 	struct drm_nouveau_channel_free *req = data;
411 	struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
412 	struct nouveau_abi16_chan *chan;
413 
414 	if (unlikely(!abi16))
415 		return -ENOMEM;
416 
417 	chan = nouveau_abi16_chan(abi16, req->channel);
418 	if (!chan)
419 		return nouveau_abi16_put(abi16, -ENOENT);
420 	nouveau_abi16_chan_fini(abi16, chan);
421 	return nouveau_abi16_put(abi16, 0);
422 }
423 
424 int
425 nouveau_abi16_ioctl_grobj_alloc(ABI16_IOCTL_ARGS)
426 {
427 	struct drm_nouveau_grobj_alloc *init = data;
428 	struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
429 	struct nouveau_abi16_chan *chan;
430 	struct nouveau_abi16_ntfy *ntfy;
431 	struct nvif_client *client;
432 	struct nvif_sclass *sclass;
433 	s32 oclass = 0;
434 	int ret, i;
435 
436 	if (unlikely(!abi16))
437 		return -ENOMEM;
438 
439 	if (init->handle == ~0)
440 		return nouveau_abi16_put(abi16, -EINVAL);
441 	client = abi16->device.object.client;
442 
443 	chan = nouveau_abi16_chan(abi16, init->channel);
444 	if (!chan)
445 		return nouveau_abi16_put(abi16, -ENOENT);
446 
447 	ret = nvif_object_sclass_get(&chan->chan->user, &sclass);
448 	if (ret < 0)
449 		return nouveau_abi16_put(abi16, ret);
450 
451 	if ((init->class & 0x00ff) == 0x006e) {
452 		/* nvsw: compatibility with older 0x*6e class identifier */
453 		for (i = 0; !oclass && i < ret; i++) {
454 			switch (sclass[i].oclass) {
455 			case NVIF_CLASS_SW_NV04:
456 			case NVIF_CLASS_SW_NV10:
457 			case NVIF_CLASS_SW_NV50:
458 			case NVIF_CLASS_SW_GF100:
459 				oclass = sclass[i].oclass;
460 				break;
461 			default:
462 				break;
463 			}
464 		}
465 	} else
466 	if ((init->class & 0x00ff) == 0x00b1) {
467 		/* msvld: compatibility with incorrect version exposure */
468 		for (i = 0; i < ret; i++) {
469 			if ((sclass[i].oclass & 0x00ff) == 0x00b1) {
470 				oclass = sclass[i].oclass;
471 				break;
472 			}
473 		}
474 	} else
475 	if ((init->class & 0x00ff) == 0x00b2) { /* mspdec */
476 		/* mspdec: compatibility with incorrect version exposure */
477 		for (i = 0; i < ret; i++) {
478 			if ((sclass[i].oclass & 0x00ff) == 0x00b2) {
479 				oclass = sclass[i].oclass;
480 				break;
481 			}
482 		}
483 	} else
484 	if ((init->class & 0x00ff) == 0x00b3) { /* msppp */
485 		/* msppp: compatibility with incorrect version exposure */
486 		for (i = 0; i < ret; i++) {
487 			if ((sclass[i].oclass & 0x00ff) == 0x00b3) {
488 				oclass = sclass[i].oclass;
489 				break;
490 			}
491 		}
492 	} else {
493 		oclass = init->class;
494 	}
495 
496 	nvif_object_sclass_put(&sclass);
497 	if (!oclass)
498 		return nouveau_abi16_put(abi16, -EINVAL);
499 
500 	ntfy = kzalloc(sizeof(*ntfy), GFP_KERNEL);
501 	if (!ntfy)
502 		return nouveau_abi16_put(abi16, -ENOMEM);
503 
504 	list_add(&ntfy->head, &chan->notifiers);
505 
506 	client->route = NVDRM_OBJECT_ABI16;
507 	ret = nvif_object_ctor(&chan->chan->user, "abi16EngObj", init->handle,
508 			       oclass, NULL, 0, &ntfy->object);
509 	client->route = NVDRM_OBJECT_NVIF;
510 
511 	if (ret)
512 		nouveau_abi16_ntfy_fini(chan, ntfy);
513 	return nouveau_abi16_put(abi16, ret);
514 }
515 
516 int
517 nouveau_abi16_ioctl_notifierobj_alloc(ABI16_IOCTL_ARGS)
518 {
519 	struct drm_nouveau_notifierobj_alloc *info = data;
520 	struct nouveau_drm *drm = nouveau_drm(dev);
521 	struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
522 	struct nouveau_abi16_chan *chan;
523 	struct nouveau_abi16_ntfy *ntfy;
524 	struct nvif_device *device = &abi16->device;
525 	struct nvif_client *client;
526 	struct nv_dma_v0 args = {};
527 	int ret;
528 
529 	if (unlikely(!abi16))
530 		return -ENOMEM;
531 
532 	/* completely unnecessary for these chipsets... */
533 	if (unlikely(device->info.family >= NV_DEVICE_INFO_V0_FERMI))
534 		return nouveau_abi16_put(abi16, -EINVAL);
535 	client = abi16->device.object.client;
536 
537 	chan = nouveau_abi16_chan(abi16, info->channel);
538 	if (!chan)
539 		return nouveau_abi16_put(abi16, -ENOENT);
540 
541 	ntfy = kzalloc(sizeof(*ntfy), GFP_KERNEL);
542 	if (!ntfy)
543 		return nouveau_abi16_put(abi16, -ENOMEM);
544 
545 	list_add(&ntfy->head, &chan->notifiers);
546 
547 	ret = nvkm_mm_head(&chan->heap, 0, 1, info->size, info->size, 1,
548 			   &ntfy->node);
549 	if (ret)
550 		goto done;
551 
552 	args.start = ntfy->node->offset;
553 	args.limit = ntfy->node->offset + ntfy->node->length - 1;
554 	if (device->info.family >= NV_DEVICE_INFO_V0_TESLA) {
555 		args.target = NV_DMA_V0_TARGET_VM;
556 		args.access = NV_DMA_V0_ACCESS_VM;
557 		args.start += chan->ntfy_vma->addr;
558 		args.limit += chan->ntfy_vma->addr;
559 	} else
560 	if (drm->agp.bridge) {
561 		args.target = NV_DMA_V0_TARGET_AGP;
562 		args.access = NV_DMA_V0_ACCESS_RDWR;
563 		args.start += drm->agp.base + chan->ntfy->offset;
564 		args.limit += drm->agp.base + chan->ntfy->offset;
565 	} else {
566 		args.target = NV_DMA_V0_TARGET_VM;
567 		args.access = NV_DMA_V0_ACCESS_RDWR;
568 		args.start += chan->ntfy->offset;
569 		args.limit += chan->ntfy->offset;
570 	}
571 
572 	client->route = NVDRM_OBJECT_ABI16;
573 	client->super = true;
574 	ret = nvif_object_ctor(&chan->chan->user, "abi16Ntfy", info->handle,
575 			       NV_DMA_IN_MEMORY, &args, sizeof(args),
576 			       &ntfy->object);
577 	client->super = false;
578 	client->route = NVDRM_OBJECT_NVIF;
579 	if (ret)
580 		goto done;
581 
582 	info->offset = ntfy->node->offset;
583 done:
584 	if (ret)
585 		nouveau_abi16_ntfy_fini(chan, ntfy);
586 	return nouveau_abi16_put(abi16, ret);
587 }
588 
589 int
590 nouveau_abi16_ioctl_gpuobj_free(ABI16_IOCTL_ARGS)
591 {
592 	struct drm_nouveau_gpuobj_free *fini = data;
593 	struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
594 	struct nouveau_abi16_chan *chan;
595 	struct nouveau_abi16_ntfy *ntfy;
596 	int ret = -ENOENT;
597 
598 	if (unlikely(!abi16))
599 		return -ENOMEM;
600 
601 	chan = nouveau_abi16_chan(abi16, fini->channel);
602 	if (!chan)
603 		return nouveau_abi16_put(abi16, -EINVAL);
604 
605 	/* synchronize with the user channel and destroy the gpu object */
606 	nouveau_channel_idle(chan->chan);
607 
608 	list_for_each_entry(ntfy, &chan->notifiers, head) {
609 		if (ntfy->object.handle == fini->handle) {
610 			nouveau_abi16_ntfy_fini(chan, ntfy);
611 			ret = 0;
612 			break;
613 		}
614 	}
615 
616 	return nouveau_abi16_put(abi16, ret);
617 }
618