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->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_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_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);
348 done:
349 	if (ret)
350 		nouveau_abi16_chan_fini(abi16, chan);
351 	return nouveau_abi16_put(abi16, ret);
352 }
353 
354 static struct nouveau_abi16_chan *
355 nouveau_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 
367 int
368 nouveau_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 
405 int
406 nouveau_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 
422 int
423 nouveau_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_init(&chan->chan->user, init->handle, oclass,
506 			       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 
514 int
515 nouveau_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->bo.offset;
562 		args.limit += drm->agp.base + chan->ntfy->bo.offset;
563 	} else {
564 		args.target = NV_DMA_V0_TARGET_VM;
565 		args.access = NV_DMA_V0_ACCESS_RDWR;
566 		args.start += chan->ntfy->bo.offset;
567 		args.limit += chan->ntfy->bo.offset;
568 	}
569 
570 	client->route = NVDRM_OBJECT_ABI16;
571 	client->super = true;
572 	ret = nvif_object_init(&chan->chan->user, 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;
581 done:
582 	if (ret)
583 		nouveau_abi16_ntfy_fini(chan, ntfy);
584 	return nouveau_abi16_put(abi16, ret);
585 }
586 
587 int
588 nouveau_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