summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/msm/msm_gem_submit.c
blob: fba78193127dee1efcdee9f8dd960d2e9e433523 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2013 Red Hat
 * Author: Rob Clark <robdclark@gmail.com>
 */

#include <linux/file.h>
#include <linux/sync_file.h>
#include <linux/uaccess.h>

#include <drm/drm_drv.h>
#include <drm/drm_file.h>
#include <drm/drm_syncobj.h>

#include "msm_drv.h"
#include "msm_gpu.h"
#include "msm_gem.h"
#include "msm_gpu_trace.h"

/* For userspace errors, use DRM_UT_DRIVER.. so that userspace can enable
 * error msgs for debugging, but we don't spam dmesg by default
 */
#define SUBMIT_ERROR(submit, fmt, ...) \
	DRM_DEV_DEBUG_DRIVER((submit)->dev->dev, fmt, ##__VA_ARGS__)

/*
 * Cmdstream submission:
 */

static struct msm_gem_submit *submit_create(struct drm_device *dev,
		struct msm_gpu *gpu,
		struct msm_gpu_submitqueue *queue, uint32_t nr_bos,
		uint32_t nr_cmds)
{
	static atomic_t ident = ATOMIC_INIT(0);
	struct msm_gem_submit *submit;
	uint64_t sz;
	int ret;

	sz = struct_size(submit, bos, nr_bos) +
			((u64)nr_cmds * sizeof(submit->cmd[0]));

	if (sz > SIZE_MAX)
		return ERR_PTR(-ENOMEM);

	submit = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN);
	if (!submit)
		return ERR_PTR(-ENOMEM);

	submit->hw_fence = msm_fence_alloc();
	if (IS_ERR(submit->hw_fence)) {
		ret = PTR_ERR(submit->hw_fence);
		kfree(submit);
		return ERR_PTR(ret);
	}

	ret = drm_sched_job_init(&submit->base, queue->entity, 1, queue);
	if (ret) {
		kfree(submit->hw_fence);
		kfree(submit);
		return ERR_PTR(ret);
	}

	kref_init(&submit->ref);
	submit->dev = dev;
	submit->aspace = queue->ctx->aspace;
	submit->gpu = gpu;
	submit->cmd = (void *)&submit->bos[nr_bos];
	submit->queue = queue;
	submit->pid = get_pid(task_pid(current));
	submit->ring = gpu->rb[queue->ring_nr];
	submit->fault_dumped = false;

	/* Get a unique identifier for the submission for logging purposes */
	submit->ident = atomic_inc_return(&ident) - 1;

	INIT_LIST_HEAD(&submit->node);

	return submit;
}

void __msm_gem_submit_destroy(struct kref *kref)
{
	struct msm_gem_submit *submit =
			container_of(kref, struct msm_gem_submit, ref);
	unsigned i;

	if (submit->fence_id) {
		spin_lock(&submit->queue->idr_lock);
		idr_remove(&submit->queue->fence_idr, submit->fence_id);
		spin_unlock(&submit->queue->idr_lock);
	}

	dma_fence_put(submit->user_fence);

	/*
	 * If the submit is freed before msm_job_run(), then hw_fence is
	 * just some pre-allocated memory, not a reference counted fence.
	 * Once the job runs and the hw_fence is initialized, it will
	 * have a refcount of at least one, since the submit holds a ref
	 * to the hw_fence.
	 */
	if (kref_read(&submit->hw_fence->refcount) == 0) {
		kfree(submit->hw_fence);
	} else {
		dma_fence_put(submit->hw_fence);
	}

	put_pid(submit->pid);
	msm_submitqueue_put(submit->queue);

	for (i = 0; i < submit->nr_cmds; i++)
		kfree(submit->cmd[i].relocs);

	kfree(submit);
}

static int submit_lookup_objects(struct msm_gem_submit *submit,
		struct drm_msm_gem_submit *args, struct drm_file *file)
{
	unsigned i;
	int ret = 0;

	for (i = 0; i < args->nr_bos; i++) {
		struct drm_msm_gem_submit_bo submit_bo;
		void __user *userptr =
			u64_to_user_ptr(args->bos + (i * sizeof(submit_bo)));

		/* make sure we don't have garbage flags, in case we hit
		 * error path before flags is initialized:
		 */
		submit->bos[i].flags = 0;

		if (copy_from_user(&submit_bo, userptr, sizeof(submit_bo))) {
			ret = -EFAULT;
			i = 0;
			goto out;
		}

/* at least one of READ and/or WRITE flags should be set: */
#define MANDATORY_FLAGS (MSM_SUBMIT_BO_READ | MSM_SUBMIT_BO_WRITE)

		if ((submit_bo.flags & ~MSM_SUBMIT_BO_FLAGS) ||
			!(submit_bo.flags & MANDATORY_FLAGS)) {
			SUBMIT_ERROR(submit, "invalid flags: %x\n", submit_bo.flags);
			ret = -EINVAL;
			i = 0;
			goto out;
		}

		submit->bos[i].handle = submit_bo.handle;
		submit->bos[i].flags = submit_bo.flags;
	}

	spin_lock(&file->table_lock);

	for (i = 0; i < args->nr_bos; i++) {
		struct drm_gem_object *obj;

		/* normally use drm_gem_object_lookup(), but for bulk lookup
		 * all under single table_lock just hit object_idr directly:
		 */
		obj = idr_find(&file->object_idr, submit->bos[i].handle);
		if (!obj) {
			SUBMIT_ERROR(submit, "invalid handle %u at index %u\n", submit->bos[i].handle, i);
			ret = -EINVAL;
			goto out_unlock;
		}

		drm_gem_object_get(obj);

		submit->bos[i].obj = obj;
	}

out_unlock:
	spin_unlock(&file->table_lock);

out:
	submit->nr_bos = i;

	return ret;
}

static int submit_lookup_cmds(struct msm_gem_submit *submit,
		struct drm_msm_gem_submit *args, struct drm_file *file)
{
	unsigned i;
	size_t sz;
	int ret = 0;

	for (i = 0; i < args->nr_cmds; i++) {
		struct drm_msm_gem_submit_cmd submit_cmd;
		void __user *userptr =
			u64_to_user_ptr(args->cmds + (i * sizeof(submit_cmd)));

		ret = copy_from_user(&submit_cmd, userptr, sizeof(submit_cmd));
		if (ret) {
			ret = -EFAULT;
			goto out;
		}

		/* validate input from userspace: */
		switch (submit_cmd.type) {
		case MSM_SUBMIT_CMD_BUF:
		case MSM_SUBMIT_CMD_IB_TARGET_BUF:
		case MSM_SUBMIT_CMD_CTX_RESTORE_BUF:
			break;
		default:
			SUBMIT_ERROR(submit, "invalid type: %08x\n", submit_cmd.type);
			return -EINVAL;
		}

		if (submit_cmd.size % 4) {
			SUBMIT_ERROR(submit, "non-aligned cmdstream buffer size: %u\n",
				     submit_cmd.size);
			ret = -EINVAL;
			goto out;
		}

		submit->cmd[i].type = submit_cmd.type;
		submit->cmd[i].size = submit_cmd.size / 4;
		submit->cmd[i].offset = submit_cmd.submit_offset / 4;
		submit->cmd[i].idx  = submit_cmd.submit_idx;
		submit->cmd[i].nr_relocs = submit_cmd.nr_relocs;

		userptr = u64_to_user_ptr(submit_cmd.relocs);

		sz = array_size(submit_cmd.nr_relocs,
				sizeof(struct drm_msm_gem_submit_reloc));
		/* check for overflow: */
		if (sz == SIZE_MAX) {
			ret = -ENOMEM;
			goto out;
		}
		submit->cmd[i].relocs = kmalloc(sz, GFP_KERNEL | __GFP_NOWARN);
		if (!submit->cmd[i].relocs) {
			ret = -ENOMEM;
			goto out;
		}
		ret = copy_from_user(submit->cmd[i].relocs, userptr, sz);
		if (ret) {
			ret = -EFAULT;
			goto out;
		}
	}

out:
	return ret;
}

/* This is where we make sure all the bo's are reserved and pin'd: */
static int submit_lock_objects(struct msm_gem_submit *submit)
{
	int ret;

	drm_exec_init(&submit->exec, DRM_EXEC_INTERRUPTIBLE_WAIT, submit->nr_bos);

	drm_exec_until_all_locked (&submit->exec) {
		for (unsigned i = 0; i < submit->nr_bos; i++) {
			struct drm_gem_object *obj = submit->bos[i].obj;
			ret = drm_exec_prepare_obj(&submit->exec, obj, 1);
			drm_exec_retry_on_contention(&submit->exec);
			if (ret)
				goto error;
		}
	}

	return 0;

error:
	return ret;
}

static int submit_fence_sync(struct msm_gem_submit *submit)
{
	int i, ret = 0;

	for (i = 0; i < submit->nr_bos; i++) {
		struct drm_gem_object *obj = submit->bos[i].obj;
		bool write = submit->bos[i].flags & MSM_SUBMIT_BO_WRITE;

		/* Otherwise userspace can ask for implicit sync to be
		 * disabled on specific buffers.  This is useful for internal
		 * usermode driver managed buffers, suballocation, etc.
		 */
		if (submit->bos[i].flags & MSM_SUBMIT_BO_NO_IMPLICIT)
			continue;

		ret = drm_sched_job_add_implicit_dependencies(&submit->base,
							      obj,
							      write);
		if (ret)
			break;
	}

	return ret;
}

static int submit_pin_objects(struct msm_gem_submit *submit)
{
	struct msm_drm_private *priv = submit->dev->dev_private;
	int i, ret = 0;

	for (i = 0; i < submit->nr_bos; i++) {
		struct drm_gem_object *obj = submit->bos[i].obj;
		struct msm_gem_vma *vma;

		/* if locking succeeded, pin bo: */
		vma = msm_gem_get_vma_locked(obj, submit->aspace);
		if (IS_ERR(vma)) {
			ret = PTR_ERR(vma);
			break;
		}

		ret = msm_gem_pin_vma_locked(obj, vma);
		if (ret)
			break;

		submit->bos[i].iova = vma->iova;
	}

	/*
	 * A second loop while holding the LRU lock (a) avoids acquiring/dropping
	 * the LRU lock for each individual bo, while (b) avoiding holding the
	 * LRU lock while calling msm_gem_pin_vma_locked() (which could trigger
	 * get_pages() which could trigger reclaim.. and if we held the LRU lock
	 * could trigger deadlock with the shrinker).
	 */
	mutex_lock(&priv->lru.lock);
	for (i = 0; i < submit->nr_bos; i++) {
		msm_gem_pin_obj_locked(submit->bos[i].obj);
	}
	mutex_unlock(&priv->lru.lock);

	submit->bos_pinned = true;

	return ret;
}

static void submit_unpin_objects(struct msm_gem_submit *submit)
{
	if (!submit->bos_pinned)
		return;

	for (int i = 0; i < submit->nr_bos; i++) {
		struct drm_gem_object *obj = submit->bos[i].obj;

		msm_gem_unpin_locked(obj);
	}

	submit->bos_pinned = false;
}

static void submit_attach_object_fences(struct msm_gem_submit *submit)
{
	int i;

	for (i = 0; i < submit->nr_bos; i++) {
		struct drm_gem_object *obj = submit->bos[i].obj;

		if (submit->bos[i].flags & MSM_SUBMIT_BO_WRITE)
			dma_resv_add_fence(obj->resv, submit->user_fence,
					   DMA_RESV_USAGE_WRITE);
		else if (submit->bos[i].flags & MSM_SUBMIT_BO_READ)
			dma_resv_add_fence(obj->resv, submit->user_fence,
					   DMA_RESV_USAGE_READ);
	}
}

static int submit_bo(struct msm_gem_submit *submit, uint32_t idx,
		struct drm_gem_object **obj, uint64_t *iova)
{
	if (idx >= submit->nr_bos) {
		SUBMIT_ERROR(submit, "invalid buffer index: %u (out of %u)\n",
			     idx, submit->nr_bos);
		return -EINVAL;
	}

	if (obj)
		*obj = submit->bos[idx].obj;
	if (iova)
		*iova = submit->bos[idx].iova;

	return 0;
}

/* process the reloc's and patch up the cmdstream as needed: */
static int submit_reloc(struct msm_gem_submit *submit, struct drm_gem_object *obj,
		uint32_t offset, uint32_t nr_relocs, struct drm_msm_gem_submit_reloc *relocs)
{
	uint32_t i, last_offset = 0;
	uint32_t *ptr;
	int ret = 0;

	if (offset % 4) {
		SUBMIT_ERROR(submit, "non-aligned cmdstream buffer: %u\n", offset);
		return -EINVAL;
	}

	/* For now, just map the entire thing.  Eventually we probably
	 * to do it page-by-page, w/ kmap() if not vmap()d..
	 */
	ptr = msm_gem_get_vaddr_locked(obj);

	if (IS_ERR(ptr)) {
		ret = PTR_ERR(ptr);
		DBG("failed to map: %d", ret);
		return ret;
	}

	for (i = 0; i < nr_relocs; i++) {
		struct drm_msm_gem_submit_reloc submit_reloc = relocs[i];
		uint32_t off;
		uint64_t iova;

		if (submit_reloc.submit_offset % 4) {
			SUBMIT_ERROR(submit, "non-aligned reloc offset: %u\n",
				     submit_reloc.submit_offset);
			ret = -EINVAL;
			goto out;
		}

		/* offset in dwords: */
		off = submit_reloc.submit_offset / 4;

		if ((off >= (obj->size / 4)) ||
				(off < last_offset)) {
			SUBMIT_ERROR(submit, "invalid offset %u at reloc %u\n", off, i);
			ret = -EINVAL;
			goto out;
		}

		ret = submit_bo(submit, submit_reloc.reloc_idx, NULL, &iova);
		if (ret)
			goto out;

		iova += submit_reloc.reloc_offset;

		if (submit_reloc.shift < 0)
			iova >>= -submit_reloc.shift;
		else
			iova <<= submit_reloc.shift;

		ptr[off] = iova | submit_reloc.or;

		last_offset = off;
	}

out:
	msm_gem_put_vaddr_locked(obj);

	return ret;
}

/* Cleanup submit at end of ioctl.  In the error case, this also drops
 * references, unpins, and drops active refcnt.  In the non-error case,
 * this is done when the submit is retired.
 */
static void submit_cleanup(struct msm_gem_submit *submit, bool error)
{
	if (error) {
		submit_unpin_objects(submit);
		/* job wasn't enqueued to scheduler, so early retirement: */
		msm_submit_retire(submit);
	}

	if (submit->exec.objects)
		drm_exec_fini(&submit->exec);
}

void msm_submit_retire(struct msm_gem_submit *submit)
{
	int i;

	for (i = 0; i < submit->nr_bos; i++) {
		struct drm_gem_object *obj = submit->bos[i].obj;

		drm_gem_object_put(obj);
	}
}

struct msm_submit_post_dep {
	struct drm_syncobj *syncobj;
	uint64_t point;
	struct dma_fence_chain *chain;
};

static struct drm_syncobj **msm_parse_deps(struct msm_gem_submit *submit,
                                           struct drm_file *file,
                                           uint64_t in_syncobjs_addr,
                                           uint32_t nr_in_syncobjs,
                                           size_t syncobj_stride)
{
	struct drm_syncobj **syncobjs = NULL;
	struct drm_msm_gem_submit_syncobj syncobj_desc = {0};
	int ret = 0;
	uint32_t i, j;

	syncobjs = kcalloc(nr_in_syncobjs, sizeof(*syncobjs),
	                   GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
	if (!syncobjs)
		return ERR_PTR(-ENOMEM);

	for (i = 0; i < nr_in_syncobjs; ++i) {
		uint64_t address = in_syncobjs_addr + i * syncobj_stride;

		if (copy_from_user(&syncobj_desc,
			           u64_to_user_ptr(address),
			           min(syncobj_stride, sizeof(syncobj_desc)))) {
			ret = -EFAULT;
			break;
		}

		if (syncobj_desc.point &&
		    !drm_core_check_feature(submit->dev, DRIVER_SYNCOBJ_TIMELINE)) {
			ret = -EOPNOTSUPP;
			break;
		}

		if (syncobj_desc.flags & ~MSM_SUBMIT_SYNCOBJ_FLAGS) {
			ret = -EINVAL;
			break;
		}

		ret = drm_sched_job_add_syncobj_dependency(&submit->base, file,
							   syncobj_desc.handle, syncobj_desc.point);
		if (ret)
			break;

		if (syncobj_desc.flags & MSM_SUBMIT_SYNCOBJ_RESET) {
			syncobjs[i] =
				drm_syncobj_find(file, syncobj_desc.handle);
			if (!syncobjs[i]) {
				ret = -EINVAL;
				break;
			}
		}
	}

	if (ret) {
		for (j = 0; j <= i; ++j) {
			if (syncobjs[j])
				drm_syncobj_put(syncobjs[j]);
		}
		kfree(syncobjs);
		return ERR_PTR(ret);
	}
	return syncobjs;
}

static void msm_reset_syncobjs(struct drm_syncobj **syncobjs,
                               uint32_t nr_syncobjs)
{
	uint32_t i;

	for (i = 0; syncobjs && i < nr_syncobjs; ++i) {
		if (syncobjs[i])
			drm_syncobj_replace_fence(syncobjs[i], NULL);
	}
}

static struct msm_submit_post_dep *msm_parse_post_deps(struct drm_device *dev,
                                                       struct drm_file *file,
                                                       uint64_t syncobjs_addr,
                                                       uint32_t nr_syncobjs,
                                                       size_t syncobj_stride)
{
	struct msm_submit_post_dep *post_deps;
	struct drm_msm_gem_submit_syncobj syncobj_desc = {0};
	int ret = 0;
	uint32_t i, j;

	post_deps = kcalloc(nr_syncobjs, sizeof(*post_deps),
			    GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
	if (!post_deps)
		return ERR_PTR(-ENOMEM);

	for (i = 0; i < nr_syncobjs; ++i) {
		uint64_t address = syncobjs_addr + i * syncobj_stride;

		if (copy_from_user(&syncobj_desc,
			           u64_to_user_ptr(address),
			           min(syncobj_stride, sizeof(syncobj_desc)))) {
			ret = -EFAULT;
			break;
		}

		post_deps[i].point = syncobj_desc.point;

		if (syncobj_desc.flags) {
			ret = -EINVAL;
			break;
		}

		if (syncobj_desc.point) {
			if (!drm_core_check_feature(dev,
			                            DRIVER_SYNCOBJ_TIMELINE)) {
				ret = -EOPNOTSUPP;
				break;
			}

			post_deps[i].chain = dma_fence_chain_alloc();
			if (!post_deps[i].chain) {
				ret = -ENOMEM;
				break;
			}
		}

		post_deps[i].syncobj =
			drm_syncobj_find(file, syncobj_desc.handle);
		if (!post_deps[i].syncobj) {
			ret = -EINVAL;
			break;
		}
	}

	if (ret) {
		for (j = 0; j <= i; ++j) {
			dma_fence_chain_free(post_deps[j].chain);
			if (post_deps[j].syncobj)
				drm_syncobj_put(post_deps[j].syncobj);
		}

		kfree(post_deps);
		return ERR_PTR(ret);
	}

	return post_deps;
}

static void msm_process_post_deps(struct msm_submit_post_dep *post_deps,
                                  uint32_t count, struct dma_fence *fence)
{
	uint32_t i;

	for (i = 0; post_deps && i < count; ++i) {
		if (post_deps[i].chain) {
			drm_syncobj_add_point(post_deps[i].syncobj,
			                      post_deps[i].chain,
			                      fence, post_deps[i].point);
			post_deps[i].chain = NULL;
		} else {
			drm_syncobj_replace_fence(post_deps[i].syncobj,
			                          fence);
		}
	}
}

int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
		struct drm_file *file)
{
	struct msm_drm_private *priv = dev->dev_private;
	struct drm_msm_gem_submit *args = data;
	struct msm_file_private *ctx = file->driver_priv;
	struct msm_gem_submit *submit = NULL;
	struct msm_gpu *gpu = priv->gpu;
	struct msm_gpu_submitqueue *queue;
	struct msm_ringbuffer *ring;
	struct msm_submit_post_dep *post_deps = NULL;
	struct drm_syncobj **syncobjs_to_reset = NULL;
	int out_fence_fd = -1;
	unsigned i;
	int ret;

	if (!gpu)
		return -ENXIO;

	if (args->pad)
		return -EINVAL;

	if (unlikely(!ctx->aspace) && !capable(CAP_SYS_RAWIO)) {
		DRM_ERROR_RATELIMITED("IOMMU support or CAP_SYS_RAWIO required!\n");
		return -EPERM;
	}

	/* for now, we just have 3d pipe.. eventually this would need to
	 * be more clever to dispatch to appropriate gpu module:
	 */
	if (MSM_PIPE_ID(args->flags) != MSM_PIPE_3D0)
		return -EINVAL;

	if (MSM_PIPE_FLAGS(args->flags) & ~MSM_SUBMIT_FLAGS)
		return -EINVAL;

	if (args->flags & MSM_SUBMIT_SUDO) {
		if (!IS_ENABLED(CONFIG_DRM_MSM_GPU_SUDO) ||
		    !capable(CAP_SYS_RAWIO))
			return -EINVAL;
	}

	queue = msm_submitqueue_get(ctx, args->queueid);
	if (!queue)
		return -ENOENT;

	ring = gpu->rb[queue->ring_nr];

	if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) {
		out_fence_fd = get_unused_fd_flags(O_CLOEXEC);
		if (out_fence_fd < 0) {
			ret = out_fence_fd;
			goto out_post_unlock;
		}
	}

	submit = submit_create(dev, gpu, queue, args->nr_bos, args->nr_cmds);
	if (IS_ERR(submit)) {
		ret = PTR_ERR(submit);
		goto out_post_unlock;
	}

	trace_msm_gpu_submit(pid_nr(submit->pid), ring->id, submit->ident,
		args->nr_bos, args->nr_cmds);

	ret = mutex_lock_interruptible(&queue->lock);
	if (ret)
		goto out_post_unlock;

	if (args->flags & MSM_SUBMIT_SUDO)
		submit->in_rb = true;

	if (args->flags & MSM_SUBMIT_FENCE_FD_IN) {
		struct dma_fence *in_fence;

		in_fence = sync_file_get_fence(args->fence_fd);

		if (!in_fence) {
			ret = -EINVAL;
			goto out_unlock;
		}

		ret = drm_sched_job_add_dependency(&submit->base, in_fence);
		if (ret)
			goto out_unlock;
	}

	if (args->flags & MSM_SUBMIT_SYNCOBJ_IN) {
		syncobjs_to_reset = msm_parse_deps(submit, file,
		                                   args->in_syncobjs,
		                                   args->nr_in_syncobjs,
		                                   args->syncobj_stride);
		if (IS_ERR(syncobjs_to_reset)) {
			ret = PTR_ERR(syncobjs_to_reset);
			goto out_unlock;
		}
	}

	if (args->flags & MSM_SUBMIT_SYNCOBJ_OUT) {
		post_deps = msm_parse_post_deps(dev, file,
		                                args->out_syncobjs,
		                                args->nr_out_syncobjs,
		                                args->syncobj_stride);
		if (IS_ERR(post_deps)) {
			ret = PTR_ERR(post_deps);
			goto out_unlock;
		}
	}

	ret = submit_lookup_objects(submit, args, file);
	if (ret)
		goto out;

	ret = submit_lookup_cmds(submit, args, file);
	if (ret)
		goto out;

	/* copy_*_user while holding a ww ticket upsets lockdep */
	ret = submit_lock_objects(submit);
	if (ret)
		goto out;

	if (!(args->flags & MSM_SUBMIT_NO_IMPLICIT)) {
		ret = submit_fence_sync(submit);
		if (ret)
			goto out;
	}

	ret = submit_pin_objects(submit);
	if (ret)
		goto out;

	for (i = 0; i < args->nr_cmds; i++) {
		struct drm_gem_object *obj;
		uint64_t iova;

		ret = submit_bo(submit, submit->cmd[i].idx, &obj, &iova);
		if (ret)
			goto out;

		if (!submit->cmd[i].size ||
			((submit->cmd[i].size + submit->cmd[i].offset) >
				obj->size / 4)) {
			SUBMIT_ERROR(submit, "invalid cmdstream size: %u\n", submit->cmd[i].size * 4);
			ret = -EINVAL;
			goto out;
		}

		submit->cmd[i].iova = iova + (submit->cmd[i].offset * 4);

		if (likely(!submit->cmd[i].nr_relocs))
			continue;

		if (!gpu->allow_relocs) {
			SUBMIT_ERROR(submit, "relocs not allowed\n");
			ret = -EINVAL;
			goto out;
		}

		ret = submit_reloc(submit, obj, submit->cmd[i].offset * 4,
				submit->cmd[i].nr_relocs, submit->cmd[i].relocs);
		if (ret)
			goto out;
	}

	submit->nr_cmds = i;

	idr_preload(GFP_KERNEL);

	spin_lock(&queue->idr_lock);

	/*
	 * If using userspace provided seqno fence, validate that the id
	 * is available before arming sched job.  Since access to fence_idr
	 * is serialized on the queue lock, the slot should be still avail
	 * after the job is armed
	 */
	if ((args->flags & MSM_SUBMIT_FENCE_SN_IN) &&
			(!args->fence || idr_find(&queue->fence_idr, args->fence))) {
		spin_unlock(&queue->idr_lock);
		idr_preload_end();
		ret = -EINVAL;
		goto out;
	}

	drm_sched_job_arm(&submit->base);

	submit->user_fence = dma_fence_get(&submit->base.s_fence->finished);

	if (args->flags & MSM_SUBMIT_FENCE_SN_IN) {
		/*
		 * Userspace has assigned the seqno fence that it wants
		 * us to use.  It is an error to pick a fence sequence
		 * number that is not available.
		 */
		submit->fence_id = args->fence;
		ret = idr_alloc_u32(&queue->fence_idr, submit->user_fence,
				    &submit->fence_id, submit->fence_id,
				    GFP_NOWAIT);
		/*
		 * We've already validated that the fence_id slot is valid,
		 * so if idr_alloc_u32 failed, it is a kernel bug
		 */
		WARN_ON(ret);
	} else {
		/*
		 * Allocate an id which can be used by WAIT_FENCE ioctl to map
		 * back to the underlying fence.
		 */
		submit->fence_id = idr_alloc_cyclic(&queue->fence_idr,
						    submit->user_fence, 1,
						    INT_MAX, GFP_NOWAIT);
	}

	spin_unlock(&queue->idr_lock);
	idr_preload_end();

	if (submit->fence_id < 0) {
		ret = submit->fence_id;
		submit->fence_id = 0;
	}

	if (ret == 0 && args->flags & MSM_SUBMIT_FENCE_FD_OUT) {
		struct sync_file *sync_file = sync_file_create(submit->user_fence);
		if (!sync_file) {
			ret = -ENOMEM;
		} else {
			fd_install(out_fence_fd, sync_file->file);
			args->fence_fd = out_fence_fd;
		}
	}

	if (ret)
		goto out;

	submit_attach_object_fences(submit);

	/* The scheduler owns a ref now: */
	msm_gem_submit_get(submit);

	msm_rd_dump_submit(priv->rd, submit, NULL);

	drm_sched_entity_push_job(&submit->base);

	args->fence = submit->fence_id;
	queue->last_fence = submit->fence_id;

	msm_reset_syncobjs(syncobjs_to_reset, args->nr_in_syncobjs);
	msm_process_post_deps(post_deps, args->nr_out_syncobjs,
	                      submit->user_fence);


out:
	submit_cleanup(submit, !!ret);
out_unlock:
	mutex_unlock(&queue->lock);
out_post_unlock:
	if (ret && (out_fence_fd >= 0))
		put_unused_fd(out_fence_fd);

	if (!IS_ERR_OR_NULL(submit)) {
		msm_gem_submit_put(submit);
	} else {
		/*
		 * If the submit hasn't yet taken ownership of the queue
		 * then we need to drop the reference ourself:
		 */
		msm_submitqueue_put(queue);
	}
	if (!IS_ERR_OR_NULL(post_deps)) {
		for (i = 0; i < args->nr_out_syncobjs; ++i) {
			kfree(post_deps[i].chain);
			drm_syncobj_put(post_deps[i].syncobj);
		}
		kfree(post_deps);
	}

	if (!IS_ERR_OR_NULL(syncobjs_to_reset)) {
		for (i = 0; i < args->nr_in_syncobjs; ++i) {
			if (syncobjs_to_reset[i])
				drm_syncobj_put(syncobjs_to_reset[i]);
		}
		kfree(syncobjs_to_reset);
	}

	return ret;
}