1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2015 Etnaviv Project
4  */
5 
6 #include <drm/drm_file.h>
7 #include <linux/dma-fence-array.h>
8 #include <linux/file.h>
9 #include <linux/pm_runtime.h>
10 #include <linux/dma-resv.h>
11 #include <linux/sync_file.h>
12 #include <linux/uaccess.h>
13 #include <linux/vmalloc.h>
14 
15 #include "etnaviv_cmdbuf.h"
16 #include "etnaviv_drv.h"
17 #include "etnaviv_gpu.h"
18 #include "etnaviv_gem.h"
19 #include "etnaviv_perfmon.h"
20 #include "etnaviv_sched.h"
21 
22 /*
23  * Cmdstream submission:
24  */
25 
26 #define BO_INVALID_FLAGS ~(ETNA_SUBMIT_BO_READ | ETNA_SUBMIT_BO_WRITE)
27 /* make sure these don't conflict w/ ETNAVIV_SUBMIT_BO_x */
28 #define BO_LOCKED   0x4000
29 #define BO_PINNED   0x2000
30 
31 static struct etnaviv_gem_submit *submit_create(struct drm_device *dev,
32 		struct etnaviv_gpu *gpu, size_t nr_bos, size_t nr_pmrs)
33 {
34 	struct etnaviv_gem_submit *submit;
35 	size_t sz = size_vstruct(nr_bos, sizeof(submit->bos[0]), sizeof(*submit));
36 
37 	submit = kzalloc(sz, GFP_KERNEL);
38 	if (!submit)
39 		return NULL;
40 
41 	submit->pmrs = kcalloc(nr_pmrs, sizeof(struct etnaviv_perfmon_request),
42 			       GFP_KERNEL);
43 	if (!submit->pmrs) {
44 		kfree(submit);
45 		return NULL;
46 	}
47 	submit->nr_pmrs = nr_pmrs;
48 
49 	submit->gpu = gpu;
50 	kref_init(&submit->refcount);
51 
52 	return submit;
53 }
54 
55 static int submit_lookup_objects(struct etnaviv_gem_submit *submit,
56 	struct drm_file *file, struct drm_etnaviv_gem_submit_bo *submit_bos,
57 	unsigned nr_bos)
58 {
59 	struct drm_etnaviv_gem_submit_bo *bo;
60 	unsigned i;
61 	int ret = 0;
62 
63 	spin_lock(&file->table_lock);
64 
65 	for (i = 0, bo = submit_bos; i < nr_bos; i++, bo++) {
66 		struct drm_gem_object *obj;
67 
68 		if (bo->flags & BO_INVALID_FLAGS) {
69 			DRM_ERROR("invalid flags: %x\n", bo->flags);
70 			ret = -EINVAL;
71 			goto out_unlock;
72 		}
73 
74 		submit->bos[i].flags = bo->flags;
75 		if (submit->flags & ETNA_SUBMIT_SOFTPIN) {
76 			if (bo->presumed < ETNAVIV_SOFTPIN_START_ADDRESS) {
77 				DRM_ERROR("invalid softpin address\n");
78 				ret = -EINVAL;
79 				goto out_unlock;
80 			}
81 			submit->bos[i].va = bo->presumed;
82 		}
83 
84 		/* normally use drm_gem_object_lookup(), but for bulk lookup
85 		 * all under single table_lock just hit object_idr directly:
86 		 */
87 		obj = idr_find(&file->object_idr, bo->handle);
88 		if (!obj) {
89 			DRM_ERROR("invalid handle %u at index %u\n",
90 				  bo->handle, i);
91 			ret = -EINVAL;
92 			goto out_unlock;
93 		}
94 
95 		/*
96 		 * Take a refcount on the object. The file table lock
97 		 * prevents the object_idr's refcount on this being dropped.
98 		 */
99 		drm_gem_object_get(obj);
100 
101 		submit->bos[i].obj = to_etnaviv_bo(obj);
102 	}
103 
104 out_unlock:
105 	submit->nr_bos = i;
106 	spin_unlock(&file->table_lock);
107 
108 	return ret;
109 }
110 
111 static void submit_unlock_object(struct etnaviv_gem_submit *submit, int i)
112 {
113 	if (submit->bos[i].flags & BO_LOCKED) {
114 		struct drm_gem_object *obj = &submit->bos[i].obj->base;
115 
116 		dma_resv_unlock(obj->resv);
117 		submit->bos[i].flags &= ~BO_LOCKED;
118 	}
119 }
120 
121 static int submit_lock_objects(struct etnaviv_gem_submit *submit,
122 		struct ww_acquire_ctx *ticket)
123 {
124 	int contended, slow_locked = -1, i, ret = 0;
125 
126 retry:
127 	for (i = 0; i < submit->nr_bos; i++) {
128 		struct drm_gem_object *obj = &submit->bos[i].obj->base;
129 
130 		if (slow_locked == i)
131 			slow_locked = -1;
132 
133 		contended = i;
134 
135 		if (!(submit->bos[i].flags & BO_LOCKED)) {
136 			ret = dma_resv_lock_interruptible(obj->resv, ticket);
137 			if (ret == -EALREADY)
138 				DRM_ERROR("BO at index %u already on submit list\n",
139 					  i);
140 			if (ret)
141 				goto fail;
142 			submit->bos[i].flags |= BO_LOCKED;
143 		}
144 	}
145 
146 	ww_acquire_done(ticket);
147 
148 	return 0;
149 
150 fail:
151 	for (; i >= 0; i--)
152 		submit_unlock_object(submit, i);
153 
154 	if (slow_locked > 0)
155 		submit_unlock_object(submit, slow_locked);
156 
157 	if (ret == -EDEADLK) {
158 		struct drm_gem_object *obj;
159 
160 		obj = &submit->bos[contended].obj->base;
161 
162 		/* we lost out in a seqno race, lock and retry.. */
163 		ret = dma_resv_lock_slow_interruptible(obj->resv, ticket);
164 		if (!ret) {
165 			submit->bos[contended].flags |= BO_LOCKED;
166 			slow_locked = contended;
167 			goto retry;
168 		}
169 	}
170 
171 	return ret;
172 }
173 
174 static int submit_fence_sync(struct etnaviv_gem_submit *submit)
175 {
176 	int i, ret = 0;
177 
178 	for (i = 0; i < submit->nr_bos; i++) {
179 		struct etnaviv_gem_submit_bo *bo = &submit->bos[i];
180 		struct dma_resv *robj = bo->obj->base.resv;
181 
182 		if (!(bo->flags & ETNA_SUBMIT_BO_WRITE)) {
183 			ret = dma_resv_reserve_shared(robj, 1);
184 			if (ret)
185 				return ret;
186 		}
187 
188 		if (submit->flags & ETNA_SUBMIT_NO_IMPLICIT)
189 			continue;
190 
191 		if (bo->flags & ETNA_SUBMIT_BO_WRITE) {
192 			ret = dma_resv_get_fences(robj, NULL,
193 						  &bo->nr_shared,
194 						  &bo->shared);
195 			if (ret)
196 				return ret;
197 		} else {
198 			bo->excl = dma_fence_get(dma_resv_excl_fence(robj));
199 		}
200 
201 	}
202 
203 	return ret;
204 }
205 
206 static void submit_attach_object_fences(struct etnaviv_gem_submit *submit)
207 {
208 	int i;
209 
210 	for (i = 0; i < submit->nr_bos; i++) {
211 		struct drm_gem_object *obj = &submit->bos[i].obj->base;
212 
213 		if (submit->bos[i].flags & ETNA_SUBMIT_BO_WRITE)
214 			dma_resv_add_excl_fence(obj->resv,
215 							  submit->out_fence);
216 		else
217 			dma_resv_add_shared_fence(obj->resv,
218 							    submit->out_fence);
219 
220 		submit_unlock_object(submit, i);
221 	}
222 }
223 
224 static int submit_pin_objects(struct etnaviv_gem_submit *submit)
225 {
226 	int i, ret = 0;
227 
228 	for (i = 0; i < submit->nr_bos; i++) {
229 		struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
230 		struct etnaviv_vram_mapping *mapping;
231 
232 		mapping = etnaviv_gem_mapping_get(&etnaviv_obj->base,
233 						  submit->mmu_context,
234 						  submit->bos[i].va);
235 		if (IS_ERR(mapping)) {
236 			ret = PTR_ERR(mapping);
237 			break;
238 		}
239 
240 		if ((submit->flags & ETNA_SUBMIT_SOFTPIN) &&
241 		     submit->bos[i].va != mapping->iova) {
242 			etnaviv_gem_mapping_unreference(mapping);
243 			return -EINVAL;
244 		}
245 
246 		atomic_inc(&etnaviv_obj->gpu_active);
247 
248 		submit->bos[i].flags |= BO_PINNED;
249 		submit->bos[i].mapping = mapping;
250 	}
251 
252 	return ret;
253 }
254 
255 static int submit_bo(struct etnaviv_gem_submit *submit, u32 idx,
256 	struct etnaviv_gem_submit_bo **bo)
257 {
258 	if (idx >= submit->nr_bos) {
259 		DRM_ERROR("invalid buffer index: %u (out of %u)\n",
260 				idx, submit->nr_bos);
261 		return -EINVAL;
262 	}
263 
264 	*bo = &submit->bos[idx];
265 
266 	return 0;
267 }
268 
269 /* process the reloc's and patch up the cmdstream as needed: */
270 static int submit_reloc(struct etnaviv_gem_submit *submit, void *stream,
271 		u32 size, const struct drm_etnaviv_gem_submit_reloc *relocs,
272 		u32 nr_relocs)
273 {
274 	u32 i, last_offset = 0;
275 	u32 *ptr = stream;
276 	int ret;
277 
278 	/* Submits using softpin don't blend with relocs */
279 	if ((submit->flags & ETNA_SUBMIT_SOFTPIN) && nr_relocs != 0)
280 		return -EINVAL;
281 
282 	for (i = 0; i < nr_relocs; i++) {
283 		const struct drm_etnaviv_gem_submit_reloc *r = relocs + i;
284 		struct etnaviv_gem_submit_bo *bo;
285 		u32 off;
286 
287 		if (unlikely(r->flags)) {
288 			DRM_ERROR("invalid reloc flags\n");
289 			return -EINVAL;
290 		}
291 
292 		if (r->submit_offset % 4) {
293 			DRM_ERROR("non-aligned reloc offset: %u\n",
294 				  r->submit_offset);
295 			return -EINVAL;
296 		}
297 
298 		/* offset in dwords: */
299 		off = r->submit_offset / 4;
300 
301 		if ((off >= size ) ||
302 				(off < last_offset)) {
303 			DRM_ERROR("invalid offset %u at reloc %u\n", off, i);
304 			return -EINVAL;
305 		}
306 
307 		ret = submit_bo(submit, r->reloc_idx, &bo);
308 		if (ret)
309 			return ret;
310 
311 		if (r->reloc_offset > bo->obj->base.size - sizeof(*ptr)) {
312 			DRM_ERROR("relocation %u outside object\n", i);
313 			return -EINVAL;
314 		}
315 
316 		ptr[off] = bo->mapping->iova + r->reloc_offset;
317 
318 		last_offset = off;
319 	}
320 
321 	return 0;
322 }
323 
324 static int submit_perfmon_validate(struct etnaviv_gem_submit *submit,
325 		u32 exec_state, const struct drm_etnaviv_gem_submit_pmr *pmrs)
326 {
327 	u32 i;
328 
329 	for (i = 0; i < submit->nr_pmrs; i++) {
330 		const struct drm_etnaviv_gem_submit_pmr *r = pmrs + i;
331 		struct etnaviv_gem_submit_bo *bo;
332 		int ret;
333 
334 		ret = submit_bo(submit, r->read_idx, &bo);
335 		if (ret)
336 			return ret;
337 
338 		/* at offset 0 a sequence number gets stored used for userspace sync */
339 		if (r->read_offset == 0) {
340 			DRM_ERROR("perfmon request: offset is 0");
341 			return -EINVAL;
342 		}
343 
344 		if (r->read_offset >= bo->obj->base.size - sizeof(u32)) {
345 			DRM_ERROR("perfmon request: offset %u outside object", i);
346 			return -EINVAL;
347 		}
348 
349 		if (r->flags & ~(ETNA_PM_PROCESS_PRE | ETNA_PM_PROCESS_POST)) {
350 			DRM_ERROR("perfmon request: flags are not valid");
351 			return -EINVAL;
352 		}
353 
354 		if (etnaviv_pm_req_validate(r, exec_state)) {
355 			DRM_ERROR("perfmon request: domain or signal not valid");
356 			return -EINVAL;
357 		}
358 
359 		submit->pmrs[i].flags = r->flags;
360 		submit->pmrs[i].domain = r->domain;
361 		submit->pmrs[i].signal = r->signal;
362 		submit->pmrs[i].sequence = r->sequence;
363 		submit->pmrs[i].offset = r->read_offset;
364 		submit->pmrs[i].bo_vma = etnaviv_gem_vmap(&bo->obj->base);
365 	}
366 
367 	return 0;
368 }
369 
370 static void submit_cleanup(struct kref *kref)
371 {
372 	struct etnaviv_gem_submit *submit =
373 			container_of(kref, struct etnaviv_gem_submit, refcount);
374 	unsigned i;
375 
376 	if (submit->runtime_resumed)
377 		pm_runtime_put_autosuspend(submit->gpu->dev);
378 
379 	if (submit->cmdbuf.suballoc)
380 		etnaviv_cmdbuf_free(&submit->cmdbuf);
381 
382 	if (submit->mmu_context)
383 		etnaviv_iommu_context_put(submit->mmu_context);
384 
385 	if (submit->prev_mmu_context)
386 		etnaviv_iommu_context_put(submit->prev_mmu_context);
387 
388 	for (i = 0; i < submit->nr_bos; i++) {
389 		struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
390 
391 		/* unpin all objects */
392 		if (submit->bos[i].flags & BO_PINNED) {
393 			etnaviv_gem_mapping_unreference(submit->bos[i].mapping);
394 			atomic_dec(&etnaviv_obj->gpu_active);
395 			submit->bos[i].mapping = NULL;
396 			submit->bos[i].flags &= ~BO_PINNED;
397 		}
398 
399 		/* if the GPU submit failed, objects might still be locked */
400 		submit_unlock_object(submit, i);
401 		drm_gem_object_put(&etnaviv_obj->base);
402 	}
403 
404 	wake_up_all(&submit->gpu->fence_event);
405 
406 	if (submit->in_fence)
407 		dma_fence_put(submit->in_fence);
408 	if (submit->out_fence) {
409 		/* first remove from IDR, so fence can not be found anymore */
410 		mutex_lock(&submit->gpu->fence_lock);
411 		idr_remove(&submit->gpu->fence_idr, submit->out_fence_id);
412 		mutex_unlock(&submit->gpu->fence_lock);
413 		dma_fence_put(submit->out_fence);
414 	}
415 	kfree(submit->pmrs);
416 	kfree(submit);
417 }
418 
419 void etnaviv_submit_put(struct etnaviv_gem_submit *submit)
420 {
421 	kref_put(&submit->refcount, submit_cleanup);
422 }
423 
424 int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data,
425 		struct drm_file *file)
426 {
427 	struct etnaviv_file_private *ctx = file->driver_priv;
428 	struct etnaviv_drm_private *priv = dev->dev_private;
429 	struct drm_etnaviv_gem_submit *args = data;
430 	struct drm_etnaviv_gem_submit_reloc *relocs;
431 	struct drm_etnaviv_gem_submit_pmr *pmrs;
432 	struct drm_etnaviv_gem_submit_bo *bos;
433 	struct etnaviv_gem_submit *submit;
434 	struct etnaviv_gpu *gpu;
435 	struct sync_file *sync_file = NULL;
436 	struct ww_acquire_ctx ticket;
437 	int out_fence_fd = -1;
438 	void *stream;
439 	int ret;
440 
441 	if (args->pipe >= ETNA_MAX_PIPES)
442 		return -EINVAL;
443 
444 	gpu = priv->gpu[args->pipe];
445 	if (!gpu)
446 		return -ENXIO;
447 
448 	if (args->stream_size % 4) {
449 		DRM_ERROR("non-aligned cmdstream buffer size: %u\n",
450 			  args->stream_size);
451 		return -EINVAL;
452 	}
453 
454 	if (args->exec_state != ETNA_PIPE_3D &&
455 	    args->exec_state != ETNA_PIPE_2D &&
456 	    args->exec_state != ETNA_PIPE_VG) {
457 		DRM_ERROR("invalid exec_state: 0x%x\n", args->exec_state);
458 		return -EINVAL;
459 	}
460 
461 	if (args->flags & ~ETNA_SUBMIT_FLAGS) {
462 		DRM_ERROR("invalid flags: 0x%x\n", args->flags);
463 		return -EINVAL;
464 	}
465 
466 	if ((args->flags & ETNA_SUBMIT_SOFTPIN) &&
467 	    priv->mmu_global->version != ETNAVIV_IOMMU_V2) {
468 		DRM_ERROR("softpin requested on incompatible MMU\n");
469 		return -EINVAL;
470 	}
471 
472 	if (args->stream_size > SZ_64K || args->nr_relocs > SZ_64K ||
473 	    args->nr_bos > SZ_64K || args->nr_pmrs > 128) {
474 		DRM_ERROR("submit arguments out of size limits\n");
475 		return -EINVAL;
476 	}
477 
478 	/*
479 	 * Copy the command submission and bo array to kernel space in
480 	 * one go, and do this outside of any locks.
481 	 */
482 	bos = kvmalloc_array(args->nr_bos, sizeof(*bos), GFP_KERNEL);
483 	relocs = kvmalloc_array(args->nr_relocs, sizeof(*relocs), GFP_KERNEL);
484 	pmrs = kvmalloc_array(args->nr_pmrs, sizeof(*pmrs), GFP_KERNEL);
485 	stream = kvmalloc_array(1, args->stream_size, GFP_KERNEL);
486 	if (!bos || !relocs || !pmrs || !stream) {
487 		ret = -ENOMEM;
488 		goto err_submit_cmds;
489 	}
490 
491 	ret = copy_from_user(bos, u64_to_user_ptr(args->bos),
492 			     args->nr_bos * sizeof(*bos));
493 	if (ret) {
494 		ret = -EFAULT;
495 		goto err_submit_cmds;
496 	}
497 
498 	ret = copy_from_user(relocs, u64_to_user_ptr(args->relocs),
499 			     args->nr_relocs * sizeof(*relocs));
500 	if (ret) {
501 		ret = -EFAULT;
502 		goto err_submit_cmds;
503 	}
504 
505 	ret = copy_from_user(pmrs, u64_to_user_ptr(args->pmrs),
506 			     args->nr_pmrs * sizeof(*pmrs));
507 	if (ret) {
508 		ret = -EFAULT;
509 		goto err_submit_cmds;
510 	}
511 
512 	ret = copy_from_user(stream, u64_to_user_ptr(args->stream),
513 			     args->stream_size);
514 	if (ret) {
515 		ret = -EFAULT;
516 		goto err_submit_cmds;
517 	}
518 
519 	if (args->flags & ETNA_SUBMIT_FENCE_FD_OUT) {
520 		out_fence_fd = get_unused_fd_flags(O_CLOEXEC);
521 		if (out_fence_fd < 0) {
522 			ret = out_fence_fd;
523 			goto err_submit_cmds;
524 		}
525 	}
526 
527 	ww_acquire_init(&ticket, &reservation_ww_class);
528 
529 	submit = submit_create(dev, gpu, args->nr_bos, args->nr_pmrs);
530 	if (!submit) {
531 		ret = -ENOMEM;
532 		goto err_submit_ww_acquire;
533 	}
534 
535 	ret = etnaviv_cmdbuf_init(priv->cmdbuf_suballoc, &submit->cmdbuf,
536 				  ALIGN(args->stream_size, 8) + 8);
537 	if (ret)
538 		goto err_submit_objects;
539 
540 	submit->ctx = file->driver_priv;
541 	submit->mmu_context = etnaviv_iommu_context_get(submit->ctx->mmu);
542 	submit->exec_state = args->exec_state;
543 	submit->flags = args->flags;
544 
545 	ret = submit_lookup_objects(submit, file, bos, args->nr_bos);
546 	if (ret)
547 		goto err_submit_objects;
548 
549 	if ((priv->mmu_global->version != ETNAVIV_IOMMU_V2) &&
550 	    !etnaviv_cmd_validate_one(gpu, stream, args->stream_size / 4,
551 				      relocs, args->nr_relocs)) {
552 		ret = -EINVAL;
553 		goto err_submit_objects;
554 	}
555 
556 	if (args->flags & ETNA_SUBMIT_FENCE_FD_IN) {
557 		submit->in_fence = sync_file_get_fence(args->fence_fd);
558 		if (!submit->in_fence) {
559 			ret = -EINVAL;
560 			goto err_submit_objects;
561 		}
562 	}
563 
564 	ret = submit_pin_objects(submit);
565 	if (ret)
566 		goto err_submit_objects;
567 
568 	ret = submit_reloc(submit, stream, args->stream_size / 4,
569 			   relocs, args->nr_relocs);
570 	if (ret)
571 		goto err_submit_objects;
572 
573 	ret = submit_perfmon_validate(submit, args->exec_state, pmrs);
574 	if (ret)
575 		goto err_submit_objects;
576 
577 	memcpy(submit->cmdbuf.vaddr, stream, args->stream_size);
578 
579 	ret = submit_lock_objects(submit, &ticket);
580 	if (ret)
581 		goto err_submit_objects;
582 
583 	ret = submit_fence_sync(submit);
584 	if (ret)
585 		goto err_submit_objects;
586 
587 	ret = etnaviv_sched_push_job(&ctx->sched_entity[args->pipe], submit);
588 	if (ret)
589 		goto err_submit_objects;
590 
591 	submit_attach_object_fences(submit);
592 
593 	if (args->flags & ETNA_SUBMIT_FENCE_FD_OUT) {
594 		/*
595 		 * This can be improved: ideally we want to allocate the sync
596 		 * file before kicking off the GPU job and just attach the
597 		 * fence to the sync file here, eliminating the ENOMEM
598 		 * possibility at this stage.
599 		 */
600 		sync_file = sync_file_create(submit->out_fence);
601 		if (!sync_file) {
602 			ret = -ENOMEM;
603 			goto err_submit_objects;
604 		}
605 		fd_install(out_fence_fd, sync_file->file);
606 	}
607 
608 	args->fence_fd = out_fence_fd;
609 	args->fence = submit->out_fence_id;
610 
611 err_submit_objects:
612 	etnaviv_submit_put(submit);
613 
614 err_submit_ww_acquire:
615 	ww_acquire_fini(&ticket);
616 
617 err_submit_cmds:
618 	if (ret && (out_fence_fd >= 0))
619 		put_unused_fd(out_fence_fd);
620 	kvfree(stream);
621 	kvfree(bos);
622 	kvfree(relocs);
623 	kvfree(pmrs);
624 
625 	return ret;
626 }
627