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 static struct msm_gem_submit *submit_create(struct drm_device *dev,
25 		struct msm_gpu *gpu,
26 		struct msm_gpu_submitqueue *queue, uint32_t nr_bos,
27 		uint32_t nr_cmds)
28 {
29 	static atomic_t ident = ATOMIC_INIT(0);
30 	struct msm_gem_submit *submit;
31 	uint64_t sz;
32 	int ret;
33 
34 	sz = struct_size(submit, bos, nr_bos) +
35 			((u64)nr_cmds * sizeof(submit->cmd[0]));
36 
37 	if (sz > SIZE_MAX)
38 		return ERR_PTR(-ENOMEM);
39 
40 	submit = kzalloc(sz, GFP_KERNEL);
41 	if (!submit)
42 		return ERR_PTR(-ENOMEM);
43 
44 	submit->hw_fence = msm_fence_alloc();
45 	if (IS_ERR(submit->hw_fence)) {
46 		ret = PTR_ERR(submit->hw_fence);
47 		kfree(submit);
48 		return ERR_PTR(ret);
49 	}
50 
51 	ret = drm_sched_job_init(&submit->base, queue->entity, queue);
52 	if (ret) {
53 		kfree(submit->hw_fence);
54 		kfree(submit);
55 		return ERR_PTR(ret);
56 	}
57 
58 	kref_init(&submit->ref);
59 	submit->dev = dev;
60 	submit->aspace = queue->ctx->aspace;
61 	submit->gpu = gpu;
62 	submit->cmd = (void *)&submit->bos[nr_bos];
63 	submit->queue = queue;
64 	submit->pid = get_pid(task_pid(current));
65 	submit->ring = gpu->rb[queue->ring_nr];
66 	submit->fault_dumped = false;
67 
68 	/* Get a unique identifier for the submission for logging purposes */
69 	submit->ident = atomic_inc_return(&ident) - 1;
70 
71 	INIT_LIST_HEAD(&submit->node);
72 
73 	return submit;
74 }
75 
76 void __msm_gem_submit_destroy(struct kref *kref)
77 {
78 	struct msm_gem_submit *submit =
79 			container_of(kref, struct msm_gem_submit, ref);
80 	unsigned i;
81 
82 	if (submit->fence_id) {
83 		spin_lock(&submit->queue->idr_lock);
84 		idr_remove(&submit->queue->fence_idr, submit->fence_id);
85 		spin_unlock(&submit->queue->idr_lock);
86 	}
87 
88 	dma_fence_put(submit->user_fence);
89 	dma_fence_put(submit->hw_fence);
90 
91 	put_pid(submit->pid);
92 	msm_submitqueue_put(submit->queue);
93 
94 	for (i = 0; i < submit->nr_cmds; i++)
95 		kfree(submit->cmd[i].relocs);
96 
97 	kfree(submit);
98 }
99 
100 static int submit_lookup_objects(struct msm_gem_submit *submit,
101 		struct drm_msm_gem_submit *args, struct drm_file *file)
102 {
103 	unsigned i;
104 	int ret = 0;
105 
106 	for (i = 0; i < args->nr_bos; i++) {
107 		struct drm_msm_gem_submit_bo submit_bo;
108 		void __user *userptr =
109 			u64_to_user_ptr(args->bos + (i * sizeof(submit_bo)));
110 
111 		/* make sure we don't have garbage flags, in case we hit
112 		 * error path before flags is initialized:
113 		 */
114 		submit->bos[i].flags = 0;
115 
116 		if (copy_from_user(&submit_bo, userptr, sizeof(submit_bo))) {
117 			ret = -EFAULT;
118 			i = 0;
119 			goto out;
120 		}
121 
122 /* at least one of READ and/or WRITE flags should be set: */
123 #define MANDATORY_FLAGS (MSM_SUBMIT_BO_READ | MSM_SUBMIT_BO_WRITE)
124 
125 		if ((submit_bo.flags & ~MSM_SUBMIT_BO_FLAGS) ||
126 			!(submit_bo.flags & MANDATORY_FLAGS)) {
127 			DRM_ERROR("invalid flags: %x\n", submit_bo.flags);
128 			ret = -EINVAL;
129 			i = 0;
130 			goto out;
131 		}
132 
133 		submit->bos[i].handle = submit_bo.handle;
134 		submit->bos[i].flags = submit_bo.flags;
135 		/* in validate_objects() we figure out if this is true: */
136 		submit->bos[i].iova  = submit_bo.presumed;
137 	}
138 
139 	spin_lock(&file->table_lock);
140 
141 	for (i = 0; i < args->nr_bos; i++) {
142 		struct drm_gem_object *obj;
143 
144 		/* normally use drm_gem_object_lookup(), but for bulk lookup
145 		 * all under single table_lock just hit object_idr directly:
146 		 */
147 		obj = idr_find(&file->object_idr, submit->bos[i].handle);
148 		if (!obj) {
149 			DRM_ERROR("invalid handle %u at index %u\n", submit->bos[i].handle, i);
150 			ret = -EINVAL;
151 			goto out_unlock;
152 		}
153 
154 		drm_gem_object_get(obj);
155 
156 		submit->bos[i].obj = to_msm_bo(obj);
157 	}
158 
159 out_unlock:
160 	spin_unlock(&file->table_lock);
161 
162 out:
163 	submit->nr_bos = i;
164 
165 	return ret;
166 }
167 
168 static int submit_lookup_cmds(struct msm_gem_submit *submit,
169 		struct drm_msm_gem_submit *args, struct drm_file *file)
170 {
171 	unsigned i;
172 	size_t sz;
173 	int ret = 0;
174 
175 	for (i = 0; i < args->nr_cmds; i++) {
176 		struct drm_msm_gem_submit_cmd submit_cmd;
177 		void __user *userptr =
178 			u64_to_user_ptr(args->cmds + (i * sizeof(submit_cmd)));
179 
180 		ret = copy_from_user(&submit_cmd, userptr, sizeof(submit_cmd));
181 		if (ret) {
182 			ret = -EFAULT;
183 			goto out;
184 		}
185 
186 		/* validate input from userspace: */
187 		switch (submit_cmd.type) {
188 		case MSM_SUBMIT_CMD_BUF:
189 		case MSM_SUBMIT_CMD_IB_TARGET_BUF:
190 		case MSM_SUBMIT_CMD_CTX_RESTORE_BUF:
191 			break;
192 		default:
193 			DRM_ERROR("invalid type: %08x\n", submit_cmd.type);
194 			return -EINVAL;
195 		}
196 
197 		if (submit_cmd.size % 4) {
198 			DRM_ERROR("non-aligned cmdstream buffer size: %u\n",
199 					submit_cmd.size);
200 			ret = -EINVAL;
201 			goto out;
202 		}
203 
204 		submit->cmd[i].type = submit_cmd.type;
205 		submit->cmd[i].size = submit_cmd.size / 4;
206 		submit->cmd[i].offset = submit_cmd.submit_offset / 4;
207 		submit->cmd[i].idx  = submit_cmd.submit_idx;
208 		submit->cmd[i].nr_relocs = submit_cmd.nr_relocs;
209 
210 		userptr = u64_to_user_ptr(submit_cmd.relocs);
211 
212 		sz = array_size(submit_cmd.nr_relocs,
213 				sizeof(struct drm_msm_gem_submit_reloc));
214 		/* check for overflow: */
215 		if (sz == SIZE_MAX) {
216 			ret = -ENOMEM;
217 			goto out;
218 		}
219 		submit->cmd[i].relocs = kmalloc(sz, GFP_KERNEL);
220 		if (!submit->cmd[i].relocs) {
221 			ret = -ENOMEM;
222 			goto out;
223 		}
224 		ret = copy_from_user(submit->cmd[i].relocs, userptr, sz);
225 		if (ret) {
226 			ret = -EFAULT;
227 			goto out;
228 		}
229 	}
230 
231 out:
232 	return ret;
233 }
234 
235 /* Unwind bo state, according to cleanup_flags.  In the success case, only
236  * the lock is dropped at the end of the submit (and active/pin ref is dropped
237  * later when the submit is retired).
238  */
239 static void submit_cleanup_bo(struct msm_gem_submit *submit, int i,
240 		unsigned cleanup_flags)
241 {
242 	struct drm_gem_object *obj = &submit->bos[i].obj->base;
243 	unsigned flags = submit->bos[i].flags & cleanup_flags;
244 
245 	/*
246 	 * Clear flags bit before dropping lock, so that the msm_job_run()
247 	 * path isn't racing with submit_cleanup() (ie. the read/modify/
248 	 * write is protected by the obj lock in all paths)
249 	 */
250 	submit->bos[i].flags &= ~cleanup_flags;
251 
252 	if (flags & BO_VMA_PINNED)
253 		msm_gem_vma_unpin(submit->bos[i].vma);
254 
255 	if (flags & BO_OBJ_PINNED)
256 		msm_gem_unpin_locked(obj);
257 
258 	if (flags & BO_LOCKED)
259 		dma_resv_unlock(obj->resv);
260 }
261 
262 static void submit_unlock_unpin_bo(struct msm_gem_submit *submit, int i)
263 {
264 	unsigned cleanup_flags = BO_VMA_PINNED | BO_OBJ_PINNED | BO_LOCKED;
265 	submit_cleanup_bo(submit, i, cleanup_flags);
266 
267 	if (!(submit->bos[i].flags & BO_VALID))
268 		submit->bos[i].iova = 0;
269 }
270 
271 /* This is where we make sure all the bo's are reserved and pin'd: */
272 static int submit_lock_objects(struct msm_gem_submit *submit)
273 {
274 	int contended, slow_locked = -1, i, ret = 0;
275 
276 retry:
277 	for (i = 0; i < submit->nr_bos; i++) {
278 		struct msm_gem_object *msm_obj = submit->bos[i].obj;
279 
280 		if (slow_locked == i)
281 			slow_locked = -1;
282 
283 		contended = i;
284 
285 		if (!(submit->bos[i].flags & BO_LOCKED)) {
286 			ret = dma_resv_lock_interruptible(msm_obj->base.resv,
287 							  &submit->ticket);
288 			if (ret)
289 				goto fail;
290 			submit->bos[i].flags |= BO_LOCKED;
291 		}
292 	}
293 
294 	ww_acquire_done(&submit->ticket);
295 
296 	return 0;
297 
298 fail:
299 	if (ret == -EALREADY) {
300 		DRM_ERROR("handle %u at index %u already on submit list\n",
301 				submit->bos[i].handle, i);
302 		ret = -EINVAL;
303 	}
304 
305 	for (; i >= 0; i--)
306 		submit_unlock_unpin_bo(submit, i);
307 
308 	if (slow_locked > 0)
309 		submit_unlock_unpin_bo(submit, slow_locked);
310 
311 	if (ret == -EDEADLK) {
312 		struct msm_gem_object *msm_obj = submit->bos[contended].obj;
313 		/* we lost out in a seqno race, lock and retry.. */
314 		ret = dma_resv_lock_slow_interruptible(msm_obj->base.resv,
315 						       &submit->ticket);
316 		if (!ret) {
317 			submit->bos[contended].flags |= BO_LOCKED;
318 			slow_locked = contended;
319 			goto retry;
320 		}
321 
322 		/* Not expecting -EALREADY here, if the bo was already
323 		 * locked, we should have gotten -EALREADY already from
324 		 * the dma_resv_lock_interruptable() call.
325 		 */
326 		WARN_ON_ONCE(ret == -EALREADY);
327 	}
328 
329 	return ret;
330 }
331 
332 static int submit_fence_sync(struct msm_gem_submit *submit, bool no_implicit)
333 {
334 	int i, ret = 0;
335 
336 	for (i = 0; i < submit->nr_bos; i++) {
337 		struct drm_gem_object *obj = &submit->bos[i].obj->base;
338 		bool write = submit->bos[i].flags & MSM_SUBMIT_BO_WRITE;
339 
340 		/* NOTE: _reserve_shared() must happen before
341 		 * _add_shared_fence(), which makes this a slightly
342 		 * strange place to call it.  OTOH this is a
343 		 * convenient can-fail point to hook it in.
344 		 */
345 		ret = dma_resv_reserve_fences(obj->resv, 1);
346 		if (ret)
347 			return ret;
348 
349 		/* If userspace has determined that explicit fencing is
350 		 * used, it can disable implicit sync on the entire
351 		 * submit:
352 		 */
353 		if (no_implicit)
354 			continue;
355 
356 		/* Otherwise userspace can ask for implicit sync to be
357 		 * disabled on specific buffers.  This is useful for internal
358 		 * usermode driver managed buffers, suballocation, etc.
359 		 */
360 		if (submit->bos[i].flags & MSM_SUBMIT_BO_NO_IMPLICIT)
361 			continue;
362 
363 		ret = drm_sched_job_add_implicit_dependencies(&submit->base,
364 							      obj,
365 							      write);
366 		if (ret)
367 			break;
368 	}
369 
370 	return ret;
371 }
372 
373 static int submit_pin_objects(struct msm_gem_submit *submit)
374 {
375 	int i, ret = 0;
376 
377 	submit->valid = true;
378 
379 	for (i = 0; i < submit->nr_bos; i++) {
380 		struct drm_gem_object *obj = &submit->bos[i].obj->base;
381 		struct msm_gem_vma *vma;
382 
383 		/* if locking succeeded, pin bo: */
384 		vma = msm_gem_get_vma_locked(obj, submit->aspace);
385 		if (IS_ERR(vma)) {
386 			ret = PTR_ERR(vma);
387 			break;
388 		}
389 
390 		ret = msm_gem_pin_vma_locked(obj, vma);
391 		if (ret)
392 			break;
393 
394 		submit->bos[i].flags |= BO_OBJ_PINNED | BO_VMA_PINNED;
395 		submit->bos[i].vma = vma;
396 
397 		if (vma->iova == submit->bos[i].iova) {
398 			submit->bos[i].flags |= BO_VALID;
399 		} else {
400 			submit->bos[i].iova = vma->iova;
401 			/* iova changed, so address in cmdstream is not valid: */
402 			submit->bos[i].flags &= ~BO_VALID;
403 			submit->valid = false;
404 		}
405 	}
406 
407 	return ret;
408 }
409 
410 static void submit_attach_object_fences(struct msm_gem_submit *submit)
411 {
412 	int i;
413 
414 	for (i = 0; i < submit->nr_bos; i++) {
415 		struct drm_gem_object *obj = &submit->bos[i].obj->base;
416 
417 		if (submit->bos[i].flags & MSM_SUBMIT_BO_WRITE)
418 			dma_resv_add_fence(obj->resv, submit->user_fence,
419 					   DMA_RESV_USAGE_WRITE);
420 		else if (submit->bos[i].flags & MSM_SUBMIT_BO_READ)
421 			dma_resv_add_fence(obj->resv, submit->user_fence,
422 					   DMA_RESV_USAGE_READ);
423 	}
424 }
425 
426 static int submit_bo(struct msm_gem_submit *submit, uint32_t idx,
427 		struct msm_gem_object **obj, uint64_t *iova, bool *valid)
428 {
429 	if (idx >= submit->nr_bos) {
430 		DRM_ERROR("invalid buffer index: %u (out of %u)\n",
431 				idx, submit->nr_bos);
432 		return -EINVAL;
433 	}
434 
435 	if (obj)
436 		*obj = submit->bos[idx].obj;
437 	if (iova)
438 		*iova = submit->bos[idx].iova;
439 	if (valid)
440 		*valid = !!(submit->bos[idx].flags & BO_VALID);
441 
442 	return 0;
443 }
444 
445 /* process the reloc's and patch up the cmdstream as needed: */
446 static int submit_reloc(struct msm_gem_submit *submit, struct msm_gem_object *obj,
447 		uint32_t offset, uint32_t nr_relocs, struct drm_msm_gem_submit_reloc *relocs)
448 {
449 	uint32_t i, last_offset = 0;
450 	uint32_t *ptr;
451 	int ret = 0;
452 
453 	if (!nr_relocs)
454 		return 0;
455 
456 	if (offset % 4) {
457 		DRM_ERROR("non-aligned cmdstream buffer: %u\n", offset);
458 		return -EINVAL;
459 	}
460 
461 	/* For now, just map the entire thing.  Eventually we probably
462 	 * to do it page-by-page, w/ kmap() if not vmap()d..
463 	 */
464 	ptr = msm_gem_get_vaddr_locked(&obj->base);
465 
466 	if (IS_ERR(ptr)) {
467 		ret = PTR_ERR(ptr);
468 		DBG("failed to map: %d", ret);
469 		return ret;
470 	}
471 
472 	for (i = 0; i < nr_relocs; i++) {
473 		struct drm_msm_gem_submit_reloc submit_reloc = relocs[i];
474 		uint32_t off;
475 		uint64_t iova;
476 		bool valid;
477 
478 		if (submit_reloc.submit_offset % 4) {
479 			DRM_ERROR("non-aligned reloc offset: %u\n",
480 					submit_reloc.submit_offset);
481 			ret = -EINVAL;
482 			goto out;
483 		}
484 
485 		/* offset in dwords: */
486 		off = submit_reloc.submit_offset / 4;
487 
488 		if ((off >= (obj->base.size / 4)) ||
489 				(off < last_offset)) {
490 			DRM_ERROR("invalid offset %u at reloc %u\n", off, i);
491 			ret = -EINVAL;
492 			goto out;
493 		}
494 
495 		ret = submit_bo(submit, submit_reloc.reloc_idx, NULL, &iova, &valid);
496 		if (ret)
497 			goto out;
498 
499 		if (valid)
500 			continue;
501 
502 		iova += submit_reloc.reloc_offset;
503 
504 		if (submit_reloc.shift < 0)
505 			iova >>= -submit_reloc.shift;
506 		else
507 			iova <<= submit_reloc.shift;
508 
509 		ptr[off] = iova | submit_reloc.or;
510 
511 		last_offset = off;
512 	}
513 
514 out:
515 	msm_gem_put_vaddr_locked(&obj->base);
516 
517 	return ret;
518 }
519 
520 /* Cleanup submit at end of ioctl.  In the error case, this also drops
521  * references, unpins, and drops active refcnt.  In the non-error case,
522  * this is done when the submit is retired.
523  */
524 static void submit_cleanup(struct msm_gem_submit *submit, bool error)
525 {
526 	unsigned cleanup_flags = BO_LOCKED;
527 	unsigned i;
528 
529 	if (error)
530 		cleanup_flags |= BO_VMA_PINNED | BO_OBJ_PINNED;
531 
532 	for (i = 0; i < submit->nr_bos; i++) {
533 		struct msm_gem_object *msm_obj = submit->bos[i].obj;
534 		submit_cleanup_bo(submit, i, cleanup_flags);
535 		if (error)
536 			drm_gem_object_put(&msm_obj->base);
537 	}
538 }
539 
540 void msm_submit_retire(struct msm_gem_submit *submit)
541 {
542 	int i;
543 
544 	for (i = 0; i < submit->nr_bos; i++) {
545 		struct drm_gem_object *obj = &submit->bos[i].obj->base;
546 
547 		drm_gem_object_put(obj);
548 	}
549 }
550 
551 struct msm_submit_post_dep {
552 	struct drm_syncobj *syncobj;
553 	uint64_t point;
554 	struct dma_fence_chain *chain;
555 };
556 
557 static struct drm_syncobj **msm_parse_deps(struct msm_gem_submit *submit,
558                                            struct drm_file *file,
559                                            uint64_t in_syncobjs_addr,
560                                            uint32_t nr_in_syncobjs,
561                                            size_t syncobj_stride,
562                                            struct msm_ringbuffer *ring)
563 {
564 	struct drm_syncobj **syncobjs = NULL;
565 	struct drm_msm_gem_submit_syncobj syncobj_desc = {0};
566 	int ret = 0;
567 	uint32_t i, j;
568 
569 	syncobjs = kcalloc(nr_in_syncobjs, sizeof(*syncobjs),
570 	                   GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
571 	if (!syncobjs)
572 		return ERR_PTR(-ENOMEM);
573 
574 	for (i = 0; i < nr_in_syncobjs; ++i) {
575 		uint64_t address = in_syncobjs_addr + i * syncobj_stride;
576 
577 		if (copy_from_user(&syncobj_desc,
578 			           u64_to_user_ptr(address),
579 			           min(syncobj_stride, sizeof(syncobj_desc)))) {
580 			ret = -EFAULT;
581 			break;
582 		}
583 
584 		if (syncobj_desc.point &&
585 		    !drm_core_check_feature(submit->dev, DRIVER_SYNCOBJ_TIMELINE)) {
586 			ret = -EOPNOTSUPP;
587 			break;
588 		}
589 
590 		if (syncobj_desc.flags & ~MSM_SUBMIT_SYNCOBJ_FLAGS) {
591 			ret = -EINVAL;
592 			break;
593 		}
594 
595 		ret = drm_sched_job_add_syncobj_dependency(&submit->base, file,
596 							   syncobj_desc.handle, syncobj_desc.point);
597 		if (ret)
598 			break;
599 
600 		if (syncobj_desc.flags & MSM_SUBMIT_SYNCOBJ_RESET) {
601 			syncobjs[i] =
602 				drm_syncobj_find(file, syncobj_desc.handle);
603 			if (!syncobjs[i]) {
604 				ret = -EINVAL;
605 				break;
606 			}
607 		}
608 	}
609 
610 	if (ret) {
611 		for (j = 0; j <= i; ++j) {
612 			if (syncobjs[j])
613 				drm_syncobj_put(syncobjs[j]);
614 		}
615 		kfree(syncobjs);
616 		return ERR_PTR(ret);
617 	}
618 	return syncobjs;
619 }
620 
621 static void msm_reset_syncobjs(struct drm_syncobj **syncobjs,
622                                uint32_t nr_syncobjs)
623 {
624 	uint32_t i;
625 
626 	for (i = 0; syncobjs && i < nr_syncobjs; ++i) {
627 		if (syncobjs[i])
628 			drm_syncobj_replace_fence(syncobjs[i], NULL);
629 	}
630 }
631 
632 static struct msm_submit_post_dep *msm_parse_post_deps(struct drm_device *dev,
633                                                        struct drm_file *file,
634                                                        uint64_t syncobjs_addr,
635                                                        uint32_t nr_syncobjs,
636                                                        size_t syncobj_stride)
637 {
638 	struct msm_submit_post_dep *post_deps;
639 	struct drm_msm_gem_submit_syncobj syncobj_desc = {0};
640 	int ret = 0;
641 	uint32_t i, j;
642 
643 	post_deps = kcalloc(nr_syncobjs, sizeof(*post_deps),
644 			    GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
645 	if (!post_deps)
646 		return ERR_PTR(-ENOMEM);
647 
648 	for (i = 0; i < nr_syncobjs; ++i) {
649 		uint64_t address = syncobjs_addr + i * syncobj_stride;
650 
651 		if (copy_from_user(&syncobj_desc,
652 			           u64_to_user_ptr(address),
653 			           min(syncobj_stride, sizeof(syncobj_desc)))) {
654 			ret = -EFAULT;
655 			break;
656 		}
657 
658 		post_deps[i].point = syncobj_desc.point;
659 
660 		if (syncobj_desc.flags) {
661 			ret = -EINVAL;
662 			break;
663 		}
664 
665 		if (syncobj_desc.point) {
666 			if (!drm_core_check_feature(dev,
667 			                            DRIVER_SYNCOBJ_TIMELINE)) {
668 				ret = -EOPNOTSUPP;
669 				break;
670 			}
671 
672 			post_deps[i].chain = dma_fence_chain_alloc();
673 			if (!post_deps[i].chain) {
674 				ret = -ENOMEM;
675 				break;
676 			}
677 		}
678 
679 		post_deps[i].syncobj =
680 			drm_syncobj_find(file, syncobj_desc.handle);
681 		if (!post_deps[i].syncobj) {
682 			ret = -EINVAL;
683 			break;
684 		}
685 	}
686 
687 	if (ret) {
688 		for (j = 0; j <= i; ++j) {
689 			dma_fence_chain_free(post_deps[j].chain);
690 			if (post_deps[j].syncobj)
691 				drm_syncobj_put(post_deps[j].syncobj);
692 		}
693 
694 		kfree(post_deps);
695 		return ERR_PTR(ret);
696 	}
697 
698 	return post_deps;
699 }
700 
701 static void msm_process_post_deps(struct msm_submit_post_dep *post_deps,
702                                   uint32_t count, struct dma_fence *fence)
703 {
704 	uint32_t i;
705 
706 	for (i = 0; post_deps && i < count; ++i) {
707 		if (post_deps[i].chain) {
708 			drm_syncobj_add_point(post_deps[i].syncobj,
709 			                      post_deps[i].chain,
710 			                      fence, post_deps[i].point);
711 			post_deps[i].chain = NULL;
712 		} else {
713 			drm_syncobj_replace_fence(post_deps[i].syncobj,
714 			                          fence);
715 		}
716 	}
717 }
718 
719 int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
720 		struct drm_file *file)
721 {
722 	struct msm_drm_private *priv = dev->dev_private;
723 	struct drm_msm_gem_submit *args = data;
724 	struct msm_file_private *ctx = file->driver_priv;
725 	struct msm_gem_submit *submit = NULL;
726 	struct msm_gpu *gpu = priv->gpu;
727 	struct msm_gpu_submitqueue *queue;
728 	struct msm_ringbuffer *ring;
729 	struct msm_submit_post_dep *post_deps = NULL;
730 	struct drm_syncobj **syncobjs_to_reset = NULL;
731 	int out_fence_fd = -1;
732 	bool has_ww_ticket = false;
733 	unsigned i;
734 	int ret;
735 
736 	if (!gpu)
737 		return -ENXIO;
738 
739 	if (args->pad)
740 		return -EINVAL;
741 
742 	if (unlikely(!ctx->aspace) && !capable(CAP_SYS_RAWIO)) {
743 		DRM_ERROR_RATELIMITED("IOMMU support or CAP_SYS_RAWIO required!\n");
744 		return -EPERM;
745 	}
746 
747 	/* for now, we just have 3d pipe.. eventually this would need to
748 	 * be more clever to dispatch to appropriate gpu module:
749 	 */
750 	if (MSM_PIPE_ID(args->flags) != MSM_PIPE_3D0)
751 		return -EINVAL;
752 
753 	if (MSM_PIPE_FLAGS(args->flags) & ~MSM_SUBMIT_FLAGS)
754 		return -EINVAL;
755 
756 	if (args->flags & MSM_SUBMIT_SUDO) {
757 		if (!IS_ENABLED(CONFIG_DRM_MSM_GPU_SUDO) ||
758 		    !capable(CAP_SYS_RAWIO))
759 			return -EINVAL;
760 	}
761 
762 	queue = msm_submitqueue_get(ctx, args->queueid);
763 	if (!queue)
764 		return -ENOENT;
765 
766 	ring = gpu->rb[queue->ring_nr];
767 
768 	if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) {
769 		out_fence_fd = get_unused_fd_flags(O_CLOEXEC);
770 		if (out_fence_fd < 0) {
771 			ret = out_fence_fd;
772 			goto out_post_unlock;
773 		}
774 	}
775 
776 	submit = submit_create(dev, gpu, queue, args->nr_bos, args->nr_cmds);
777 	if (IS_ERR(submit)) {
778 		ret = PTR_ERR(submit);
779 		goto out_post_unlock;
780 	}
781 
782 	trace_msm_gpu_submit(pid_nr(submit->pid), ring->id, submit->ident,
783 		args->nr_bos, args->nr_cmds);
784 
785 	ret = mutex_lock_interruptible(&queue->lock);
786 	if (ret)
787 		goto out_post_unlock;
788 
789 	if (args->flags & MSM_SUBMIT_SUDO)
790 		submit->in_rb = true;
791 
792 	if (args->flags & MSM_SUBMIT_FENCE_FD_IN) {
793 		struct dma_fence *in_fence;
794 
795 		in_fence = sync_file_get_fence(args->fence_fd);
796 
797 		if (!in_fence) {
798 			ret = -EINVAL;
799 			goto out_unlock;
800 		}
801 
802 		ret = drm_sched_job_add_dependency(&submit->base, in_fence);
803 		if (ret)
804 			goto out_unlock;
805 	}
806 
807 	if (args->flags & MSM_SUBMIT_SYNCOBJ_IN) {
808 		syncobjs_to_reset = msm_parse_deps(submit, file,
809 		                                   args->in_syncobjs,
810 		                                   args->nr_in_syncobjs,
811 		                                   args->syncobj_stride, ring);
812 		if (IS_ERR(syncobjs_to_reset)) {
813 			ret = PTR_ERR(syncobjs_to_reset);
814 			goto out_unlock;
815 		}
816 	}
817 
818 	if (args->flags & MSM_SUBMIT_SYNCOBJ_OUT) {
819 		post_deps = msm_parse_post_deps(dev, file,
820 		                                args->out_syncobjs,
821 		                                args->nr_out_syncobjs,
822 		                                args->syncobj_stride);
823 		if (IS_ERR(post_deps)) {
824 			ret = PTR_ERR(post_deps);
825 			goto out_unlock;
826 		}
827 	}
828 
829 	ret = submit_lookup_objects(submit, args, file);
830 	if (ret)
831 		goto out;
832 
833 	ret = submit_lookup_cmds(submit, args, file);
834 	if (ret)
835 		goto out;
836 
837 	/* copy_*_user while holding a ww ticket upsets lockdep */
838 	ww_acquire_init(&submit->ticket, &reservation_ww_class);
839 	has_ww_ticket = true;
840 	ret = submit_lock_objects(submit);
841 	if (ret)
842 		goto out;
843 
844 	ret = submit_fence_sync(submit, !!(args->flags & MSM_SUBMIT_NO_IMPLICIT));
845 	if (ret)
846 		goto out;
847 
848 	ret = submit_pin_objects(submit);
849 	if (ret)
850 		goto out;
851 
852 	for (i = 0; i < args->nr_cmds; i++) {
853 		struct msm_gem_object *msm_obj;
854 		uint64_t iova;
855 
856 		ret = submit_bo(submit, submit->cmd[i].idx,
857 				&msm_obj, &iova, NULL);
858 		if (ret)
859 			goto out;
860 
861 		if (!submit->cmd[i].size ||
862 			((submit->cmd[i].size + submit->cmd[i].offset) >
863 				msm_obj->base.size / 4)) {
864 			DRM_ERROR("invalid cmdstream size: %u\n", submit->cmd[i].size * 4);
865 			ret = -EINVAL;
866 			goto out;
867 		}
868 
869 		submit->cmd[i].iova = iova + (submit->cmd[i].offset * 4);
870 
871 		if (submit->valid)
872 			continue;
873 
874 		ret = submit_reloc(submit, msm_obj, submit->cmd[i].offset * 4,
875 				submit->cmd[i].nr_relocs, submit->cmd[i].relocs);
876 		if (ret)
877 			goto out;
878 	}
879 
880 	submit->nr_cmds = i;
881 
882 	idr_preload(GFP_KERNEL);
883 
884 	spin_lock(&queue->idr_lock);
885 
886 	/*
887 	 * If using userspace provided seqno fence, validate that the id
888 	 * is available before arming sched job.  Since access to fence_idr
889 	 * is serialized on the queue lock, the slot should be still avail
890 	 * after the job is armed
891 	 */
892 	if ((args->flags & MSM_SUBMIT_FENCE_SN_IN) &&
893 			idr_find(&queue->fence_idr, args->fence)) {
894 		spin_unlock(&queue->idr_lock);
895 		idr_preload_end();
896 		ret = -EINVAL;
897 		goto out;
898 	}
899 
900 	drm_sched_job_arm(&submit->base);
901 
902 	submit->user_fence = dma_fence_get(&submit->base.s_fence->finished);
903 
904 	if (args->flags & MSM_SUBMIT_FENCE_SN_IN) {
905 		/*
906 		 * Userspace has assigned the seqno fence that it wants
907 		 * us to use.  It is an error to pick a fence sequence
908 		 * number that is not available.
909 		 */
910 		submit->fence_id = args->fence;
911 		ret = idr_alloc_u32(&queue->fence_idr, submit->user_fence,
912 				    &submit->fence_id, submit->fence_id,
913 				    GFP_NOWAIT);
914 		/*
915 		 * We've already validated that the fence_id slot is valid,
916 		 * so if idr_alloc_u32 failed, it is a kernel bug
917 		 */
918 		WARN_ON(ret);
919 	} else {
920 		/*
921 		 * Allocate an id which can be used by WAIT_FENCE ioctl to map
922 		 * back to the underlying fence.
923 		 */
924 		submit->fence_id = idr_alloc_cyclic(&queue->fence_idr,
925 						    submit->user_fence, 1,
926 						    INT_MAX, GFP_NOWAIT);
927 	}
928 
929 	spin_unlock(&queue->idr_lock);
930 	idr_preload_end();
931 
932 	if (submit->fence_id < 0) {
933 		ret = submit->fence_id;
934 		submit->fence_id = 0;
935 	}
936 
937 	if (ret == 0 && args->flags & MSM_SUBMIT_FENCE_FD_OUT) {
938 		struct sync_file *sync_file = sync_file_create(submit->user_fence);
939 		if (!sync_file) {
940 			ret = -ENOMEM;
941 		} else {
942 			fd_install(out_fence_fd, sync_file->file);
943 			args->fence_fd = out_fence_fd;
944 		}
945 	}
946 
947 	submit_attach_object_fences(submit);
948 
949 	/* The scheduler owns a ref now: */
950 	msm_gem_submit_get(submit);
951 
952 	drm_sched_entity_push_job(&submit->base);
953 
954 	args->fence = submit->fence_id;
955 	queue->last_fence = submit->fence_id;
956 
957 	msm_reset_syncobjs(syncobjs_to_reset, args->nr_in_syncobjs);
958 	msm_process_post_deps(post_deps, args->nr_out_syncobjs,
959 	                      submit->user_fence);
960 
961 
962 out:
963 	submit_cleanup(submit, !!ret);
964 	if (has_ww_ticket)
965 		ww_acquire_fini(&submit->ticket);
966 out_unlock:
967 	mutex_unlock(&queue->lock);
968 out_post_unlock:
969 	if (ret && (out_fence_fd >= 0))
970 		put_unused_fd(out_fence_fd);
971 
972 	if (!IS_ERR_OR_NULL(submit)) {
973 		msm_gem_submit_put(submit);
974 	} else {
975 		/*
976 		 * If the submit hasn't yet taken ownership of the queue
977 		 * then we need to drop the reference ourself:
978 		 */
979 		msm_submitqueue_put(queue);
980 	}
981 	if (!IS_ERR_OR_NULL(post_deps)) {
982 		for (i = 0; i < args->nr_out_syncobjs; ++i) {
983 			kfree(post_deps[i].chain);
984 			drm_syncobj_put(post_deps[i].syncobj);
985 		}
986 		kfree(post_deps);
987 	}
988 
989 	if (!IS_ERR_OR_NULL(syncobjs_to_reset)) {
990 		for (i = 0; i < args->nr_in_syncobjs; ++i) {
991 			if (syncobjs_to_reset[i])
992 				drm_syncobj_put(syncobjs_to_reset[i]);
993 		}
994 		kfree(syncobjs_to_reset);
995 	}
996 
997 	return ret;
998 }
999