1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2013 Red Hat
4  * Author: Rob Clark <robdclark@gmail.com>
5  */
6 
7 #include <linux/file.h>
8 #include <linux/sync_file.h>
9 #include <linux/uaccess.h>
10 
11 #include <drm/drm_drv.h>
12 #include <drm/drm_file.h>
13 #include <drm/drm_syncobj.h>
14 
15 #include "msm_drv.h"
16 #include "msm_gpu.h"
17 #include "msm_gem.h"
18 #include "msm_gpu_trace.h"
19 
20 /*
21  * Cmdstream submission:
22  */
23 
24 /* make sure these don't conflict w/ MSM_SUBMIT_BO_x */
25 #define BO_VALID    0x8000   /* is current addr in cmdstream correct/valid? */
26 #define BO_LOCKED   0x4000
27 #define BO_PINNED   0x2000
28 
29 static struct msm_gem_submit *submit_create(struct drm_device *dev,
30 		struct msm_gpu *gpu,
31 		struct msm_gpu_submitqueue *queue, uint32_t nr_bos,
32 		uint32_t nr_cmds)
33 {
34 	struct msm_gem_submit *submit;
35 	uint64_t sz = struct_size(submit, bos, nr_bos) +
36 				  ((u64)nr_cmds * sizeof(submit->cmd[0]));
37 
38 	if (sz > SIZE_MAX)
39 		return NULL;
40 
41 	submit = kmalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
42 	if (!submit)
43 		return NULL;
44 
45 	kref_init(&submit->ref);
46 	submit->dev = dev;
47 	submit->aspace = queue->ctx->aspace;
48 	submit->gpu = gpu;
49 	submit->fence = NULL;
50 	submit->cmd = (void *)&submit->bos[nr_bos];
51 	submit->queue = queue;
52 	submit->ring = gpu->rb[queue->prio];
53 
54 	/* initially, until copy_from_user() and bo lookup succeeds: */
55 	submit->nr_bos = 0;
56 	submit->nr_cmds = 0;
57 
58 	INIT_LIST_HEAD(&submit->node);
59 	INIT_LIST_HEAD(&submit->bo_list);
60 
61 	return submit;
62 }
63 
64 void __msm_gem_submit_destroy(struct kref *kref)
65 {
66 	struct msm_gem_submit *submit =
67 			container_of(kref, struct msm_gem_submit, ref);
68 	unsigned i;
69 
70 	dma_fence_put(submit->fence);
71 	put_pid(submit->pid);
72 	msm_submitqueue_put(submit->queue);
73 
74 	for (i = 0; i < submit->nr_cmds; i++)
75 		kfree(submit->cmd[i].relocs);
76 
77 	kfree(submit);
78 }
79 
80 static int submit_lookup_objects(struct msm_gem_submit *submit,
81 		struct drm_msm_gem_submit *args, struct drm_file *file)
82 {
83 	unsigned i;
84 	int ret = 0;
85 
86 	for (i = 0; i < args->nr_bos; i++) {
87 		struct drm_msm_gem_submit_bo submit_bo;
88 		void __user *userptr =
89 			u64_to_user_ptr(args->bos + (i * sizeof(submit_bo)));
90 
91 		/* make sure we don't have garbage flags, in case we hit
92 		 * error path before flags is initialized:
93 		 */
94 		submit->bos[i].flags = 0;
95 
96 		if (copy_from_user(&submit_bo, userptr, sizeof(submit_bo))) {
97 			ret = -EFAULT;
98 			i = 0;
99 			goto out;
100 		}
101 
102 /* at least one of READ and/or WRITE flags should be set: */
103 #define MANDATORY_FLAGS (MSM_SUBMIT_BO_READ | MSM_SUBMIT_BO_WRITE)
104 
105 		if ((submit_bo.flags & ~MSM_SUBMIT_BO_FLAGS) ||
106 			!(submit_bo.flags & MANDATORY_FLAGS)) {
107 			DRM_ERROR("invalid flags: %x\n", submit_bo.flags);
108 			ret = -EINVAL;
109 			i = 0;
110 			goto out;
111 		}
112 
113 		submit->bos[i].handle = submit_bo.handle;
114 		submit->bos[i].flags = submit_bo.flags;
115 		/* in validate_objects() we figure out if this is true: */
116 		submit->bos[i].iova  = submit_bo.presumed;
117 	}
118 
119 	spin_lock(&file->table_lock);
120 
121 	for (i = 0; i < args->nr_bos; i++) {
122 		struct drm_gem_object *obj;
123 		struct msm_gem_object *msm_obj;
124 
125 		/* normally use drm_gem_object_lookup(), but for bulk lookup
126 		 * all under single table_lock just hit object_idr directly:
127 		 */
128 		obj = idr_find(&file->object_idr, submit->bos[i].handle);
129 		if (!obj) {
130 			DRM_ERROR("invalid handle %u at index %u\n", submit->bos[i].handle, i);
131 			ret = -EINVAL;
132 			goto out_unlock;
133 		}
134 
135 		msm_obj = to_msm_bo(obj);
136 
137 		if (!list_empty(&msm_obj->submit_entry)) {
138 			DRM_ERROR("handle %u at index %u already on submit list\n",
139 					submit->bos[i].handle, i);
140 			ret = -EINVAL;
141 			goto out_unlock;
142 		}
143 
144 		drm_gem_object_get(obj);
145 
146 		submit->bos[i].obj = msm_obj;
147 
148 		list_add_tail(&msm_obj->submit_entry, &submit->bo_list);
149 	}
150 
151 out_unlock:
152 	spin_unlock(&file->table_lock);
153 
154 out:
155 	submit->nr_bos = i;
156 
157 	return ret;
158 }
159 
160 static int submit_lookup_cmds(struct msm_gem_submit *submit,
161 		struct drm_msm_gem_submit *args, struct drm_file *file)
162 {
163 	unsigned i, sz;
164 	int ret = 0;
165 
166 	for (i = 0; i < args->nr_cmds; i++) {
167 		struct drm_msm_gem_submit_cmd submit_cmd;
168 		void __user *userptr =
169 			u64_to_user_ptr(args->cmds + (i * sizeof(submit_cmd)));
170 
171 		ret = copy_from_user(&submit_cmd, userptr, sizeof(submit_cmd));
172 		if (ret) {
173 			ret = -EFAULT;
174 			goto out;
175 		}
176 
177 		/* validate input from userspace: */
178 		switch (submit_cmd.type) {
179 		case MSM_SUBMIT_CMD_BUF:
180 		case MSM_SUBMIT_CMD_IB_TARGET_BUF:
181 		case MSM_SUBMIT_CMD_CTX_RESTORE_BUF:
182 			break;
183 		default:
184 			DRM_ERROR("invalid type: %08x\n", submit_cmd.type);
185 			return -EINVAL;
186 		}
187 
188 		if (submit_cmd.size % 4) {
189 			DRM_ERROR("non-aligned cmdstream buffer size: %u\n",
190 					submit_cmd.size);
191 			ret = -EINVAL;
192 			goto out;
193 		}
194 
195 		submit->cmd[i].type = submit_cmd.type;
196 		submit->cmd[i].size = submit_cmd.size / 4;
197 		submit->cmd[i].offset = submit_cmd.submit_offset / 4;
198 		submit->cmd[i].idx  = submit_cmd.submit_idx;
199 		submit->cmd[i].nr_relocs = submit_cmd.nr_relocs;
200 
201 		userptr = u64_to_user_ptr(submit_cmd.relocs);
202 
203 		sz = array_size(submit_cmd.nr_relocs,
204 				sizeof(struct drm_msm_gem_submit_reloc));
205 		/* check for overflow: */
206 		if (sz == SIZE_MAX) {
207 			ret = -ENOMEM;
208 			goto out;
209 		}
210 		submit->cmd[i].relocs = kmalloc(sz, GFP_KERNEL);
211 		ret = copy_from_user(submit->cmd[i].relocs, userptr, sz);
212 		if (ret) {
213 			ret = -EFAULT;
214 			goto out;
215 		}
216 	}
217 
218 out:
219 	return ret;
220 }
221 
222 static void submit_unlock_unpin_bo(struct msm_gem_submit *submit,
223 		int i, bool backoff)
224 {
225 	struct msm_gem_object *msm_obj = submit->bos[i].obj;
226 
227 	if (submit->bos[i].flags & BO_PINNED)
228 		msm_gem_unpin_iova_locked(&msm_obj->base, submit->aspace);
229 
230 	if (submit->bos[i].flags & BO_LOCKED)
231 		dma_resv_unlock(msm_obj->base.resv);
232 
233 	if (backoff && !(submit->bos[i].flags & BO_VALID))
234 		submit->bos[i].iova = 0;
235 
236 	submit->bos[i].flags &= ~(BO_LOCKED | BO_PINNED);
237 }
238 
239 /* This is where we make sure all the bo's are reserved and pin'd: */
240 static int submit_lock_objects(struct msm_gem_submit *submit)
241 {
242 	int contended, slow_locked = -1, i, ret = 0;
243 
244 retry:
245 	for (i = 0; i < submit->nr_bos; i++) {
246 		struct msm_gem_object *msm_obj = submit->bos[i].obj;
247 
248 		if (slow_locked == i)
249 			slow_locked = -1;
250 
251 		contended = i;
252 
253 		if (!(submit->bos[i].flags & BO_LOCKED)) {
254 			ret = dma_resv_lock_interruptible(msm_obj->base.resv,
255 							  &submit->ticket);
256 			if (ret)
257 				goto fail;
258 			submit->bos[i].flags |= BO_LOCKED;
259 		}
260 	}
261 
262 	ww_acquire_done(&submit->ticket);
263 
264 	return 0;
265 
266 fail:
267 	for (; i >= 0; i--)
268 		submit_unlock_unpin_bo(submit, i, true);
269 
270 	if (slow_locked > 0)
271 		submit_unlock_unpin_bo(submit, slow_locked, true);
272 
273 	if (ret == -EDEADLK) {
274 		struct msm_gem_object *msm_obj = submit->bos[contended].obj;
275 		/* we lost out in a seqno race, lock and retry.. */
276 		ret = dma_resv_lock_slow_interruptible(msm_obj->base.resv,
277 						       &submit->ticket);
278 		if (!ret) {
279 			submit->bos[contended].flags |= BO_LOCKED;
280 			slow_locked = contended;
281 			goto retry;
282 		}
283 	}
284 
285 	return ret;
286 }
287 
288 static int submit_fence_sync(struct msm_gem_submit *submit, bool no_implicit)
289 {
290 	int i, ret = 0;
291 
292 	for (i = 0; i < submit->nr_bos; i++) {
293 		struct msm_gem_object *msm_obj = submit->bos[i].obj;
294 		bool write = submit->bos[i].flags & MSM_SUBMIT_BO_WRITE;
295 
296 		if (!write) {
297 			/* NOTE: _reserve_shared() must happen before
298 			 * _add_shared_fence(), which makes this a slightly
299 			 * strange place to call it.  OTOH this is a
300 			 * convenient can-fail point to hook it in.
301 			 */
302 			ret = dma_resv_reserve_shared(msm_obj->base.resv,
303 								1);
304 			if (ret)
305 				return ret;
306 		}
307 
308 		if (no_implicit)
309 			continue;
310 
311 		ret = msm_gem_sync_object(&msm_obj->base, submit->ring->fctx,
312 			write);
313 		if (ret)
314 			break;
315 	}
316 
317 	return ret;
318 }
319 
320 static int submit_pin_objects(struct msm_gem_submit *submit)
321 {
322 	int i, ret = 0;
323 
324 	submit->valid = true;
325 
326 	for (i = 0; i < submit->nr_bos; i++) {
327 		struct msm_gem_object *msm_obj = submit->bos[i].obj;
328 		uint64_t iova;
329 
330 		/* if locking succeeded, pin bo: */
331 		ret = msm_gem_get_and_pin_iova_locked(&msm_obj->base,
332 				submit->aspace, &iova);
333 
334 		if (ret)
335 			break;
336 
337 		submit->bos[i].flags |= BO_PINNED;
338 
339 		if (iova == submit->bos[i].iova) {
340 			submit->bos[i].flags |= BO_VALID;
341 		} else {
342 			submit->bos[i].iova = iova;
343 			/* iova changed, so address in cmdstream is not valid: */
344 			submit->bos[i].flags &= ~BO_VALID;
345 			submit->valid = false;
346 		}
347 	}
348 
349 	return ret;
350 }
351 
352 static int submit_bo(struct msm_gem_submit *submit, uint32_t idx,
353 		struct msm_gem_object **obj, uint64_t *iova, bool *valid)
354 {
355 	if (idx >= submit->nr_bos) {
356 		DRM_ERROR("invalid buffer index: %u (out of %u)\n",
357 				idx, submit->nr_bos);
358 		return -EINVAL;
359 	}
360 
361 	if (obj)
362 		*obj = submit->bos[idx].obj;
363 	if (iova)
364 		*iova = submit->bos[idx].iova;
365 	if (valid)
366 		*valid = !!(submit->bos[idx].flags & BO_VALID);
367 
368 	return 0;
369 }
370 
371 /* process the reloc's and patch up the cmdstream as needed: */
372 static int submit_reloc(struct msm_gem_submit *submit, struct msm_gem_object *obj,
373 		uint32_t offset, uint32_t nr_relocs, struct drm_msm_gem_submit_reloc *relocs)
374 {
375 	uint32_t i, last_offset = 0;
376 	uint32_t *ptr;
377 	int ret = 0;
378 
379 	if (!nr_relocs)
380 		return 0;
381 
382 	if (offset % 4) {
383 		DRM_ERROR("non-aligned cmdstream buffer: %u\n", offset);
384 		return -EINVAL;
385 	}
386 
387 	/* For now, just map the entire thing.  Eventually we probably
388 	 * to do it page-by-page, w/ kmap() if not vmap()d..
389 	 */
390 	ptr = msm_gem_get_vaddr_locked(&obj->base);
391 
392 	if (IS_ERR(ptr)) {
393 		ret = PTR_ERR(ptr);
394 		DBG("failed to map: %d", ret);
395 		return ret;
396 	}
397 
398 	for (i = 0; i < nr_relocs; i++) {
399 		struct drm_msm_gem_submit_reloc submit_reloc = relocs[i];
400 		uint32_t off;
401 		uint64_t iova;
402 		bool valid;
403 
404 		if (submit_reloc.submit_offset % 4) {
405 			DRM_ERROR("non-aligned reloc offset: %u\n",
406 					submit_reloc.submit_offset);
407 			ret = -EINVAL;
408 			goto out;
409 		}
410 
411 		/* offset in dwords: */
412 		off = submit_reloc.submit_offset / 4;
413 
414 		if ((off >= (obj->base.size / 4)) ||
415 				(off < last_offset)) {
416 			DRM_ERROR("invalid offset %u at reloc %u\n", off, i);
417 			ret = -EINVAL;
418 			goto out;
419 		}
420 
421 		ret = submit_bo(submit, submit_reloc.reloc_idx, NULL, &iova, &valid);
422 		if (ret)
423 			goto out;
424 
425 		if (valid)
426 			continue;
427 
428 		iova += submit_reloc.reloc_offset;
429 
430 		if (submit_reloc.shift < 0)
431 			iova >>= -submit_reloc.shift;
432 		else
433 			iova <<= submit_reloc.shift;
434 
435 		ptr[off] = iova | submit_reloc.or;
436 
437 		last_offset = off;
438 	}
439 
440 out:
441 	msm_gem_put_vaddr_locked(&obj->base);
442 
443 	return ret;
444 }
445 
446 static void submit_cleanup(struct msm_gem_submit *submit)
447 {
448 	unsigned i;
449 
450 	for (i = 0; i < submit->nr_bos; i++) {
451 		struct msm_gem_object *msm_obj = submit->bos[i].obj;
452 		submit_unlock_unpin_bo(submit, i, false);
453 		list_del_init(&msm_obj->submit_entry);
454 		drm_gem_object_put_locked(&msm_obj->base);
455 	}
456 }
457 
458 
459 struct msm_submit_post_dep {
460 	struct drm_syncobj *syncobj;
461 	uint64_t point;
462 	struct dma_fence_chain *chain;
463 };
464 
465 static struct drm_syncobj **msm_wait_deps(struct drm_device *dev,
466                                           struct drm_file *file,
467                                           uint64_t in_syncobjs_addr,
468                                           uint32_t nr_in_syncobjs,
469                                           size_t syncobj_stride,
470                                           struct msm_ringbuffer *ring)
471 {
472 	struct drm_syncobj **syncobjs = NULL;
473 	struct drm_msm_gem_submit_syncobj syncobj_desc = {0};
474 	int ret = 0;
475 	uint32_t i, j;
476 
477 	syncobjs = kcalloc(nr_in_syncobjs, sizeof(*syncobjs),
478 	                   GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
479 	if (!syncobjs)
480 		return ERR_PTR(-ENOMEM);
481 
482 	for (i = 0; i < nr_in_syncobjs; ++i) {
483 		uint64_t address = in_syncobjs_addr + i * syncobj_stride;
484 		struct dma_fence *fence;
485 
486 		if (copy_from_user(&syncobj_desc,
487 			           u64_to_user_ptr(address),
488 			           min(syncobj_stride, sizeof(syncobj_desc)))) {
489 			ret = -EFAULT;
490 			break;
491 		}
492 
493 		if (syncobj_desc.point &&
494 		    !drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE)) {
495 			ret = -EOPNOTSUPP;
496 			break;
497 		}
498 
499 		if (syncobj_desc.flags & ~MSM_SUBMIT_SYNCOBJ_FLAGS) {
500 			ret = -EINVAL;
501 			break;
502 		}
503 
504 		ret = drm_syncobj_find_fence(file, syncobj_desc.handle,
505 		                             syncobj_desc.point, 0, &fence);
506 		if (ret)
507 			break;
508 
509 		if (!dma_fence_match_context(fence, ring->fctx->context))
510 			ret = dma_fence_wait(fence, true);
511 
512 		dma_fence_put(fence);
513 		if (ret)
514 			break;
515 
516 		if (syncobj_desc.flags & MSM_SUBMIT_SYNCOBJ_RESET) {
517 			syncobjs[i] =
518 				drm_syncobj_find(file, syncobj_desc.handle);
519 			if (!syncobjs[i]) {
520 				ret = -EINVAL;
521 				break;
522 			}
523 		}
524 	}
525 
526 	if (ret) {
527 		for (j = 0; j <= i; ++j) {
528 			if (syncobjs[j])
529 				drm_syncobj_put(syncobjs[j]);
530 		}
531 		kfree(syncobjs);
532 		return ERR_PTR(ret);
533 	}
534 	return syncobjs;
535 }
536 
537 static void msm_reset_syncobjs(struct drm_syncobj **syncobjs,
538                                uint32_t nr_syncobjs)
539 {
540 	uint32_t i;
541 
542 	for (i = 0; syncobjs && i < nr_syncobjs; ++i) {
543 		if (syncobjs[i])
544 			drm_syncobj_replace_fence(syncobjs[i], NULL);
545 	}
546 }
547 
548 static struct msm_submit_post_dep *msm_parse_post_deps(struct drm_device *dev,
549                                                        struct drm_file *file,
550                                                        uint64_t syncobjs_addr,
551                                                        uint32_t nr_syncobjs,
552                                                        size_t syncobj_stride)
553 {
554 	struct msm_submit_post_dep *post_deps;
555 	struct drm_msm_gem_submit_syncobj syncobj_desc = {0};
556 	int ret = 0;
557 	uint32_t i, j;
558 
559 	post_deps = kmalloc_array(nr_syncobjs, sizeof(*post_deps),
560 	                          GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
561 	if (!post_deps)
562 		return ERR_PTR(-ENOMEM);
563 
564 	for (i = 0; i < nr_syncobjs; ++i) {
565 		uint64_t address = syncobjs_addr + i * syncobj_stride;
566 
567 		if (copy_from_user(&syncobj_desc,
568 			           u64_to_user_ptr(address),
569 			           min(syncobj_stride, sizeof(syncobj_desc)))) {
570 			ret = -EFAULT;
571 			break;
572 		}
573 
574 		post_deps[i].point = syncobj_desc.point;
575 		post_deps[i].chain = NULL;
576 
577 		if (syncobj_desc.flags) {
578 			ret = -EINVAL;
579 			break;
580 		}
581 
582 		if (syncobj_desc.point) {
583 			if (!drm_core_check_feature(dev,
584 			                            DRIVER_SYNCOBJ_TIMELINE)) {
585 				ret = -EOPNOTSUPP;
586 				break;
587 			}
588 
589 			post_deps[i].chain =
590 				kmalloc(sizeof(*post_deps[i].chain),
591 				        GFP_KERNEL);
592 			if (!post_deps[i].chain) {
593 				ret = -ENOMEM;
594 				break;
595 			}
596 		}
597 
598 		post_deps[i].syncobj =
599 			drm_syncobj_find(file, syncobj_desc.handle);
600 		if (!post_deps[i].syncobj) {
601 			ret = -EINVAL;
602 			break;
603 		}
604 	}
605 
606 	if (ret) {
607 		for (j = 0; j <= i; ++j) {
608 			kfree(post_deps[j].chain);
609 			if (post_deps[j].syncobj)
610 				drm_syncobj_put(post_deps[j].syncobj);
611 		}
612 
613 		kfree(post_deps);
614 		return ERR_PTR(ret);
615 	}
616 
617 	return post_deps;
618 }
619 
620 static void msm_process_post_deps(struct msm_submit_post_dep *post_deps,
621                                   uint32_t count, struct dma_fence *fence)
622 {
623 	uint32_t i;
624 
625 	for (i = 0; post_deps && i < count; ++i) {
626 		if (post_deps[i].chain) {
627 			drm_syncobj_add_point(post_deps[i].syncobj,
628 			                      post_deps[i].chain,
629 			                      fence, post_deps[i].point);
630 			post_deps[i].chain = NULL;
631 		} else {
632 			drm_syncobj_replace_fence(post_deps[i].syncobj,
633 			                          fence);
634 		}
635 	}
636 }
637 
638 int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
639 		struct drm_file *file)
640 {
641 	static atomic_t ident = ATOMIC_INIT(0);
642 	struct msm_drm_private *priv = dev->dev_private;
643 	struct drm_msm_gem_submit *args = data;
644 	struct msm_file_private *ctx = file->driver_priv;
645 	struct msm_gem_submit *submit;
646 	struct msm_gpu *gpu = priv->gpu;
647 	struct sync_file *sync_file = NULL;
648 	struct msm_gpu_submitqueue *queue;
649 	struct msm_ringbuffer *ring;
650 	struct msm_submit_post_dep *post_deps = NULL;
651 	struct drm_syncobj **syncobjs_to_reset = NULL;
652 	int out_fence_fd = -1;
653 	struct pid *pid = get_pid(task_pid(current));
654 	bool has_ww_ticket = false;
655 	unsigned i;
656 	int ret, submitid;
657 	if (!gpu)
658 		return -ENXIO;
659 
660 	if (args->pad)
661 		return -EINVAL;
662 
663 	/* for now, we just have 3d pipe.. eventually this would need to
664 	 * be more clever to dispatch to appropriate gpu module:
665 	 */
666 	if (MSM_PIPE_ID(args->flags) != MSM_PIPE_3D0)
667 		return -EINVAL;
668 
669 	if (MSM_PIPE_FLAGS(args->flags) & ~MSM_SUBMIT_FLAGS)
670 		return -EINVAL;
671 
672 	if (args->flags & MSM_SUBMIT_SUDO) {
673 		if (!IS_ENABLED(CONFIG_DRM_MSM_GPU_SUDO) ||
674 		    !capable(CAP_SYS_RAWIO))
675 			return -EINVAL;
676 	}
677 
678 	queue = msm_submitqueue_get(ctx, args->queueid);
679 	if (!queue)
680 		return -ENOENT;
681 
682 	/* Get a unique identifier for the submission for logging purposes */
683 	submitid = atomic_inc_return(&ident) - 1;
684 
685 	ring = gpu->rb[queue->prio];
686 	trace_msm_gpu_submit(pid_nr(pid), ring->id, submitid,
687 		args->nr_bos, args->nr_cmds);
688 
689 	if (args->flags & MSM_SUBMIT_FENCE_FD_IN) {
690 		struct dma_fence *in_fence;
691 
692 		in_fence = sync_file_get_fence(args->fence_fd);
693 
694 		if (!in_fence)
695 			return -EINVAL;
696 
697 		/*
698 		 * Wait if the fence is from a foreign context, or if the fence
699 		 * array contains any fence from a foreign context.
700 		 */
701 		ret = 0;
702 		if (!dma_fence_match_context(in_fence, ring->fctx->context))
703 			ret = dma_fence_wait(in_fence, true);
704 
705 		dma_fence_put(in_fence);
706 		if (ret)
707 			return ret;
708 	}
709 
710 	if (args->flags & MSM_SUBMIT_SYNCOBJ_IN) {
711 		syncobjs_to_reset = msm_wait_deps(dev, file,
712 		                                  args->in_syncobjs,
713 		                                  args->nr_in_syncobjs,
714 		                                  args->syncobj_stride, ring);
715 		if (IS_ERR(syncobjs_to_reset))
716 			return PTR_ERR(syncobjs_to_reset);
717 	}
718 
719 	if (args->flags & MSM_SUBMIT_SYNCOBJ_OUT) {
720 		post_deps = msm_parse_post_deps(dev, file,
721 		                                args->out_syncobjs,
722 		                                args->nr_out_syncobjs,
723 		                                args->syncobj_stride);
724 		if (IS_ERR(post_deps)) {
725 			ret = PTR_ERR(post_deps);
726 			goto out_post_unlock;
727 		}
728 	}
729 
730 	ret = mutex_lock_interruptible(&dev->struct_mutex);
731 	if (ret)
732 		goto out_post_unlock;
733 
734 	if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) {
735 		out_fence_fd = get_unused_fd_flags(O_CLOEXEC);
736 		if (out_fence_fd < 0) {
737 			ret = out_fence_fd;
738 			goto out_unlock;
739 		}
740 	}
741 
742 	submit = submit_create(dev, gpu, queue, args->nr_bos,
743 		args->nr_cmds);
744 	if (!submit) {
745 		ret = -ENOMEM;
746 		goto out_unlock;
747 	}
748 
749 	submit->pid = pid;
750 	submit->ident = submitid;
751 
752 	if (args->flags & MSM_SUBMIT_SUDO)
753 		submit->in_rb = true;
754 
755 	ret = submit_lookup_objects(submit, args, file);
756 	if (ret)
757 		goto out_pre_pm;
758 
759 	ret = submit_lookup_cmds(submit, args, file);
760 	if (ret)
761 		goto out_pre_pm;
762 
763 	/*
764 	 * Thanks to dev_pm_opp opp_table_lock interactions with mm->mmap_sem
765 	 * in the resume path, we need to to rpm get before we lock objs.
766 	 * Which unfortunately might involve powering up the GPU sooner than
767 	 * is necessary.  But at least in the explicit fencing case, we will
768 	 * have already done all the fence waiting.
769 	 */
770 	pm_runtime_get_sync(&gpu->pdev->dev);
771 
772 	/* copy_*_user while holding a ww ticket upsets lockdep */
773 	ww_acquire_init(&submit->ticket, &reservation_ww_class);
774 	has_ww_ticket = true;
775 	ret = submit_lock_objects(submit);
776 	if (ret)
777 		goto out;
778 
779 	ret = submit_fence_sync(submit, !!(args->flags & MSM_SUBMIT_NO_IMPLICIT));
780 	if (ret)
781 		goto out;
782 
783 	ret = submit_pin_objects(submit);
784 	if (ret)
785 		goto out;
786 
787 	for (i = 0; i < args->nr_cmds; i++) {
788 		struct msm_gem_object *msm_obj;
789 		uint64_t iova;
790 
791 		ret = submit_bo(submit, submit->cmd[i].idx,
792 				&msm_obj, &iova, NULL);
793 		if (ret)
794 			goto out;
795 
796 		if (!submit->cmd[i].size ||
797 			((submit->cmd[i].size + submit->cmd[i].offset) >
798 				msm_obj->base.size / 4)) {
799 			DRM_ERROR("invalid cmdstream size: %u\n", submit->cmd[i].size * 4);
800 			ret = -EINVAL;
801 			goto out;
802 		}
803 
804 		submit->cmd[i].iova = iova + (submit->cmd[i].offset * 4);
805 
806 		if (submit->valid)
807 			continue;
808 
809 		ret = submit_reloc(submit, msm_obj, submit->cmd[i].offset * 4,
810 				submit->cmd[i].nr_relocs, submit->cmd[i].relocs);
811 		if (ret)
812 			goto out;
813 	}
814 
815 	submit->nr_cmds = i;
816 
817 	submit->fence = msm_fence_alloc(ring->fctx);
818 	if (IS_ERR(submit->fence)) {
819 		ret = PTR_ERR(submit->fence);
820 		submit->fence = NULL;
821 		goto out;
822 	}
823 
824 	if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) {
825 		sync_file = sync_file_create(submit->fence);
826 		if (!sync_file) {
827 			ret = -ENOMEM;
828 			goto out;
829 		}
830 	}
831 
832 	msm_gpu_submit(gpu, submit);
833 
834 	args->fence = submit->fence->seqno;
835 
836 	if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) {
837 		fd_install(out_fence_fd, sync_file->file);
838 		args->fence_fd = out_fence_fd;
839 	}
840 
841 	msm_reset_syncobjs(syncobjs_to_reset, args->nr_in_syncobjs);
842 	msm_process_post_deps(post_deps, args->nr_out_syncobjs,
843 	                      submit->fence);
844 
845 
846 out:
847 	pm_runtime_put(&gpu->pdev->dev);
848 out_pre_pm:
849 	submit_cleanup(submit);
850 	if (has_ww_ticket)
851 		ww_acquire_fini(&submit->ticket);
852 	msm_gem_submit_put(submit);
853 out_unlock:
854 	if (ret && (out_fence_fd >= 0))
855 		put_unused_fd(out_fence_fd);
856 	mutex_unlock(&dev->struct_mutex);
857 
858 out_post_unlock:
859 	if (!IS_ERR_OR_NULL(post_deps)) {
860 		for (i = 0; i < args->nr_out_syncobjs; ++i) {
861 			kfree(post_deps[i].chain);
862 			drm_syncobj_put(post_deps[i].syncobj);
863 		}
864 		kfree(post_deps);
865 	}
866 
867 	if (!IS_ERR_OR_NULL(syncobjs_to_reset)) {
868 		for (i = 0; i < args->nr_in_syncobjs; ++i) {
869 			if (syncobjs_to_reset[i])
870 				drm_syncobj_put(syncobjs_to_reset[i]);
871 		}
872 		kfree(syncobjs_to_reset);
873 	}
874 
875 	return ret;
876 }
877