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_init(&cli->base.object, 0, NV_DEVICE,
59 					     &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_fini(&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_unlocked(&chan->ntfy->gem);
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_fini(&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 
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 
247 int
248 nouveau_abi16_ioctl_setparam(ABI16_IOCTL_ARGS)
249 {
250 	return -EINVAL;
251 }
252 
253 int
254 nouveau_abi16_ioctl_channel_alloc(ABI16_IOCTL_ARGS)
255 {
256 	struct drm_nouveau_channel_alloc *init = data;
257 	struct nouveau_cli *cli = nouveau_cli(file_priv);
258 	struct nouveau_drm *drm = nouveau_drm(dev);
259 	struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
260 	struct nouveau_abi16_chan *chan;
261 	struct nvif_device *device;
262 	u64 engine;
263 	int ret;
264 
265 	if (unlikely(!abi16))
266 		return -ENOMEM;
267 
268 	if (!drm->channel)
269 		return nouveau_abi16_put(abi16, -ENODEV);
270 
271 	device = &abi16->device;
272 
273 	/* hack to allow channel engine type specification on kepler */
274 	if (device->info.family >= NV_DEVICE_INFO_V0_KEPLER) {
275 		if (init->fb_ctxdma_handle == ~0) {
276 			switch (init->tt_ctxdma_handle) {
277 			case 0x01: engine = NV_DEVICE_INFO_ENGINE_GR    ; break;
278 			case 0x02: engine = NV_DEVICE_INFO_ENGINE_MSPDEC; break;
279 			case 0x04: engine = NV_DEVICE_INFO_ENGINE_MSPPP ; break;
280 			case 0x08: engine = NV_DEVICE_INFO_ENGINE_MSVLD ; break;
281 			case 0x30: engine = NV_DEVICE_INFO_ENGINE_CE    ; break;
282 			default:
283 				return nouveau_abi16_put(abi16, -ENOSYS);
284 			}
285 		} else {
286 			engine = NV_DEVICE_INFO_ENGINE_GR;
287 		}
288 
289 		if (engine != NV_DEVICE_INFO_ENGINE_CE)
290 			engine = nvif_fifo_runlist(device, engine);
291 		else
292 			engine = nvif_fifo_runlist_ce(device);
293 		init->fb_ctxdma_handle = engine;
294 		init->tt_ctxdma_handle = 0;
295 	}
296 
297 	if (init->fb_ctxdma_handle == ~0 || init->tt_ctxdma_handle == ~0)
298 		return nouveau_abi16_put(abi16, -EINVAL);
299 
300 	/* allocate "abi16 channel" data and make up a handle for it */
301 	chan = kzalloc(sizeof(*chan), GFP_KERNEL);
302 	if (!chan)
303 		return nouveau_abi16_put(abi16, -ENOMEM);
304 
305 	INIT_LIST_HEAD(&chan->notifiers);
306 	list_add(&chan->head, &abi16->channels);
307 
308 	/* create channel object and initialise dma and fence management */
309 	ret = nouveau_channel_new(drm, device, init->fb_ctxdma_handle,
310 				  init->tt_ctxdma_handle, false, &chan->chan);
311 	if (ret)
312 		goto done;
313 
314 	init->channel = chan->chan->chid;
315 
316 	if (device->info.family >= NV_DEVICE_INFO_V0_TESLA)
317 		init->pushbuf_domains = NOUVEAU_GEM_DOMAIN_VRAM |
318 					NOUVEAU_GEM_DOMAIN_GART;
319 	else
320 	if (chan->chan->push.buffer->bo.mem.mem_type == TTM_PL_VRAM)
321 		init->pushbuf_domains = NOUVEAU_GEM_DOMAIN_VRAM;
322 	else
323 		init->pushbuf_domains = NOUVEAU_GEM_DOMAIN_GART;
324 
325 	if (device->info.family < NV_DEVICE_INFO_V0_CELSIUS) {
326 		init->subchan[0].handle = 0x00000000;
327 		init->subchan[0].grclass = 0x0000;
328 		init->subchan[1].handle = chan->chan->nvsw.handle;
329 		init->subchan[1].grclass = 0x506e;
330 		init->nr_subchan = 2;
331 	}
332 
333 	/* Named memory object area */
334 	ret = nouveau_gem_new(cli, PAGE_SIZE, 0, NOUVEAU_GEM_DOMAIN_GART,
335 			      0, 0, &chan->ntfy);
336 	if (ret == 0)
337 		ret = nouveau_bo_pin(chan->ntfy, TTM_PL_FLAG_TT, false);
338 	if (ret)
339 		goto done;
340 
341 	if (device->info.family >= NV_DEVICE_INFO_V0_TESLA) {
342 		ret = nouveau_vma_new(chan->ntfy, chan->chan->vmm,
343 				      &chan->ntfy_vma);
344 		if (ret)
345 			goto done;
346 	}
347 
348 	ret = drm_gem_handle_create(file_priv, &chan->ntfy->gem,
349 				    &init->notifier_handle);
350 	if (ret)
351 		goto done;
352 
353 	ret = nvkm_mm_init(&chan->heap, 0, 0, PAGE_SIZE, 1);
354 done:
355 	if (ret)
356 		nouveau_abi16_chan_fini(abi16, chan);
357 	return nouveau_abi16_put(abi16, ret);
358 }
359 
360 static struct nouveau_abi16_chan *
361 nouveau_abi16_chan(struct nouveau_abi16 *abi16, int channel)
362 {
363 	struct nouveau_abi16_chan *chan;
364 
365 	list_for_each_entry(chan, &abi16->channels, head) {
366 		if (chan->chan->chid == channel)
367 			return chan;
368 	}
369 
370 	return NULL;
371 }
372 
373 int
374 nouveau_abi16_usif(struct drm_file *file_priv, void *data, u32 size)
375 {
376 	union {
377 		struct nvif_ioctl_v0 v0;
378 	} *args = data;
379 	struct nouveau_abi16_chan *chan;
380 	struct nouveau_abi16 *abi16;
381 	int ret = -ENOSYS;
382 
383 	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
384 		switch (args->v0.type) {
385 		case NVIF_IOCTL_V0_NEW:
386 		case NVIF_IOCTL_V0_MTHD:
387 		case NVIF_IOCTL_V0_SCLASS:
388 			break;
389 		default:
390 			return -EACCES;
391 		}
392 	} else
393 		return ret;
394 
395 	if (!(abi16 = nouveau_abi16(file_priv)))
396 		return -ENOMEM;
397 
398 	if (args->v0.token != ~0ULL) {
399 		if (!(chan = nouveau_abi16_chan(abi16, args->v0.token)))
400 			return -EINVAL;
401 		args->v0.object = nvif_handle(&chan->chan->user);
402 		args->v0.owner  = NVIF_IOCTL_V0_OWNER_ANY;
403 		return 0;
404 	}
405 
406 	args->v0.object = nvif_handle(&abi16->device.object);
407 	args->v0.owner  = NVIF_IOCTL_V0_OWNER_ANY;
408 	return 0;
409 }
410 
411 int
412 nouveau_abi16_ioctl_channel_free(ABI16_IOCTL_ARGS)
413 {
414 	struct drm_nouveau_channel_free *req = data;
415 	struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
416 	struct nouveau_abi16_chan *chan;
417 
418 	if (unlikely(!abi16))
419 		return -ENOMEM;
420 
421 	chan = nouveau_abi16_chan(abi16, req->channel);
422 	if (!chan)
423 		return nouveau_abi16_put(abi16, -ENOENT);
424 	nouveau_abi16_chan_fini(abi16, chan);
425 	return nouveau_abi16_put(abi16, 0);
426 }
427 
428 int
429 nouveau_abi16_ioctl_grobj_alloc(ABI16_IOCTL_ARGS)
430 {
431 	struct drm_nouveau_grobj_alloc *init = data;
432 	struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
433 	struct nouveau_abi16_chan *chan;
434 	struct nouveau_abi16_ntfy *ntfy;
435 	struct nvif_client *client;
436 	struct nvif_sclass *sclass;
437 	s32 oclass = 0;
438 	int ret, i;
439 
440 	if (unlikely(!abi16))
441 		return -ENOMEM;
442 
443 	if (init->handle == ~0)
444 		return nouveau_abi16_put(abi16, -EINVAL);
445 	client = abi16->device.object.client;
446 
447 	chan = nouveau_abi16_chan(abi16, init->channel);
448 	if (!chan)
449 		return nouveau_abi16_put(abi16, -ENOENT);
450 
451 	ret = nvif_object_sclass_get(&chan->chan->user, &sclass);
452 	if (ret < 0)
453 		return nouveau_abi16_put(abi16, ret);
454 
455 	if ((init->class & 0x00ff) == 0x006e) {
456 		/* nvsw: compatibility with older 0x*6e class identifier */
457 		for (i = 0; !oclass && i < ret; i++) {
458 			switch (sclass[i].oclass) {
459 			case NVIF_CLASS_SW_NV04:
460 			case NVIF_CLASS_SW_NV10:
461 			case NVIF_CLASS_SW_NV50:
462 			case NVIF_CLASS_SW_GF100:
463 				oclass = sclass[i].oclass;
464 				break;
465 			default:
466 				break;
467 			}
468 		}
469 	} else
470 	if ((init->class & 0x00ff) == 0x00b1) {
471 		/* msvld: compatibility with incorrect version exposure */
472 		for (i = 0; i < ret; i++) {
473 			if ((sclass[i].oclass & 0x00ff) == 0x00b1) {
474 				oclass = sclass[i].oclass;
475 				break;
476 			}
477 		}
478 	} else
479 	if ((init->class & 0x00ff) == 0x00b2) { /* mspdec */
480 		/* mspdec: compatibility with incorrect version exposure */
481 		for (i = 0; i < ret; i++) {
482 			if ((sclass[i].oclass & 0x00ff) == 0x00b2) {
483 				oclass = sclass[i].oclass;
484 				break;
485 			}
486 		}
487 	} else
488 	if ((init->class & 0x00ff) == 0x00b3) { /* msppp */
489 		/* msppp: compatibility with incorrect version exposure */
490 		for (i = 0; i < ret; i++) {
491 			if ((sclass[i].oclass & 0x00ff) == 0x00b3) {
492 				oclass = sclass[i].oclass;
493 				break;
494 			}
495 		}
496 	} else {
497 		oclass = init->class;
498 	}
499 
500 	nvif_object_sclass_put(&sclass);
501 	if (!oclass)
502 		return nouveau_abi16_put(abi16, -EINVAL);
503 
504 	ntfy = kzalloc(sizeof(*ntfy), GFP_KERNEL);
505 	if (!ntfy)
506 		return nouveau_abi16_put(abi16, -ENOMEM);
507 
508 	list_add(&ntfy->head, &chan->notifiers);
509 
510 	client->route = NVDRM_OBJECT_ABI16;
511 	ret = nvif_object_init(&chan->chan->user, init->handle, oclass,
512 			       NULL, 0, &ntfy->object);
513 	client->route = NVDRM_OBJECT_NVIF;
514 
515 	if (ret)
516 		nouveau_abi16_ntfy_fini(chan, ntfy);
517 	return nouveau_abi16_put(abi16, ret);
518 }
519 
520 int
521 nouveau_abi16_ioctl_notifierobj_alloc(ABI16_IOCTL_ARGS)
522 {
523 	struct drm_nouveau_notifierobj_alloc *info = data;
524 	struct nouveau_drm *drm = nouveau_drm(dev);
525 	struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
526 	struct nouveau_abi16_chan *chan;
527 	struct nouveau_abi16_ntfy *ntfy;
528 	struct nvif_device *device = &abi16->device;
529 	struct nvif_client *client;
530 	struct nv_dma_v0 args = {};
531 	int ret;
532 
533 	if (unlikely(!abi16))
534 		return -ENOMEM;
535 
536 	/* completely unnecessary for these chipsets... */
537 	if (unlikely(device->info.family >= NV_DEVICE_INFO_V0_FERMI))
538 		return nouveau_abi16_put(abi16, -EINVAL);
539 	client = abi16->device.object.client;
540 
541 	chan = nouveau_abi16_chan(abi16, info->channel);
542 	if (!chan)
543 		return nouveau_abi16_put(abi16, -ENOENT);
544 
545 	ntfy = kzalloc(sizeof(*ntfy), GFP_KERNEL);
546 	if (!ntfy)
547 		return nouveau_abi16_put(abi16, -ENOMEM);
548 
549 	list_add(&ntfy->head, &chan->notifiers);
550 
551 	ret = nvkm_mm_head(&chan->heap, 0, 1, info->size, info->size, 1,
552 			   &ntfy->node);
553 	if (ret)
554 		goto done;
555 
556 	args.start = ntfy->node->offset;
557 	args.limit = ntfy->node->offset + ntfy->node->length - 1;
558 	if (device->info.family >= NV_DEVICE_INFO_V0_TESLA) {
559 		args.target = NV_DMA_V0_TARGET_VM;
560 		args.access = NV_DMA_V0_ACCESS_VM;
561 		args.start += chan->ntfy_vma->addr;
562 		args.limit += chan->ntfy_vma->addr;
563 	} else
564 	if (drm->agp.bridge) {
565 		args.target = NV_DMA_V0_TARGET_AGP;
566 		args.access = NV_DMA_V0_ACCESS_RDWR;
567 		args.start += drm->agp.base + chan->ntfy->bo.offset;
568 		args.limit += drm->agp.base + chan->ntfy->bo.offset;
569 	} else {
570 		args.target = NV_DMA_V0_TARGET_VM;
571 		args.access = NV_DMA_V0_ACCESS_RDWR;
572 		args.start += chan->ntfy->bo.offset;
573 		args.limit += chan->ntfy->bo.offset;
574 	}
575 
576 	client->route = NVDRM_OBJECT_ABI16;
577 	client->super = true;
578 	ret = nvif_object_init(&chan->chan->user, info->handle,
579 			       NV_DMA_IN_MEMORY, &args, sizeof(args),
580 			       &ntfy->object);
581 	client->super = false;
582 	client->route = NVDRM_OBJECT_NVIF;
583 	if (ret)
584 		goto done;
585 
586 	info->offset = ntfy->node->offset;
587 done:
588 	if (ret)
589 		nouveau_abi16_ntfy_fini(chan, ntfy);
590 	return nouveau_abi16_put(abi16, ret);
591 }
592 
593 int
594 nouveau_abi16_ioctl_gpuobj_free(ABI16_IOCTL_ARGS)
595 {
596 	struct drm_nouveau_gpuobj_free *fini = data;
597 	struct nouveau_abi16 *abi16 = nouveau_abi16_get(file_priv);
598 	struct nouveau_abi16_chan *chan;
599 	struct nouveau_abi16_ntfy *ntfy;
600 	int ret = -ENOENT;
601 
602 	if (unlikely(!abi16))
603 		return -ENOMEM;
604 
605 	chan = nouveau_abi16_chan(abi16, fini->channel);
606 	if (!chan)
607 		return nouveau_abi16_put(abi16, -EINVAL);
608 
609 	/* synchronize with the user channel and destroy the gpu object */
610 	nouveau_channel_idle(chan->chan);
611 
612 	list_for_each_entry(ntfy, &chan->notifiers, head) {
613 		if (ntfy->object.handle == fini->handle) {
614 			nouveau_abi16_ntfy_fini(chan, ntfy);
615 			ret = 0;
616 			break;
617 		}
618 	}
619 
620 	return nouveau_abi16_put(abi16, ret);
621 }
622