1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2015-2018 Etnaviv Project
4  */
5 
6 #include <drm/drm_prime.h>
7 #include <linux/dma-mapping.h>
8 #include <linux/shmem_fs.h>
9 #include <linux/spinlock.h>
10 #include <linux/vmalloc.h>
11 
12 #include "etnaviv_drv.h"
13 #include "etnaviv_gem.h"
14 #include "etnaviv_gpu.h"
15 #include "etnaviv_mmu.h"
16 
17 static struct lock_class_key etnaviv_shm_lock_class;
18 static struct lock_class_key etnaviv_userptr_lock_class;
19 
20 static void etnaviv_gem_scatter_map(struct etnaviv_gem_object *etnaviv_obj)
21 {
22 	struct drm_device *dev = etnaviv_obj->base.dev;
23 	struct sg_table *sgt = etnaviv_obj->sgt;
24 
25 	/*
26 	 * For non-cached buffers, ensure the new pages are clean
27 	 * because display controller, GPU, etc. are not coherent.
28 	 */
29 	if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK)
30 		dma_map_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL);
31 }
32 
33 static void etnaviv_gem_scatterlist_unmap(struct etnaviv_gem_object *etnaviv_obj)
34 {
35 	struct drm_device *dev = etnaviv_obj->base.dev;
36 	struct sg_table *sgt = etnaviv_obj->sgt;
37 
38 	/*
39 	 * For non-cached buffers, ensure the new pages are clean
40 	 * because display controller, GPU, etc. are not coherent:
41 	 *
42 	 * WARNING: The DMA API does not support concurrent CPU
43 	 * and device access to the memory area.  With BIDIRECTIONAL,
44 	 * we will clean the cache lines which overlap the region,
45 	 * and invalidate all cache lines (partially) contained in
46 	 * the region.
47 	 *
48 	 * If you have dirty data in the overlapping cache lines,
49 	 * that will corrupt the GPU-written data.  If you have
50 	 * written into the remainder of the region, this can
51 	 * discard those writes.
52 	 */
53 	if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK)
54 		dma_unmap_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL);
55 }
56 
57 /* called with etnaviv_obj->lock held */
58 static int etnaviv_gem_shmem_get_pages(struct etnaviv_gem_object *etnaviv_obj)
59 {
60 	struct drm_device *dev = etnaviv_obj->base.dev;
61 	struct page **p = drm_gem_get_pages(&etnaviv_obj->base);
62 
63 	if (IS_ERR(p)) {
64 		dev_dbg(dev->dev, "could not get pages: %ld\n", PTR_ERR(p));
65 		return PTR_ERR(p);
66 	}
67 
68 	etnaviv_obj->pages = p;
69 
70 	return 0;
71 }
72 
73 static void put_pages(struct etnaviv_gem_object *etnaviv_obj)
74 {
75 	if (etnaviv_obj->sgt) {
76 		etnaviv_gem_scatterlist_unmap(etnaviv_obj);
77 		sg_free_table(etnaviv_obj->sgt);
78 		kfree(etnaviv_obj->sgt);
79 		etnaviv_obj->sgt = NULL;
80 	}
81 	if (etnaviv_obj->pages) {
82 		drm_gem_put_pages(&etnaviv_obj->base, etnaviv_obj->pages,
83 				  true, false);
84 
85 		etnaviv_obj->pages = NULL;
86 	}
87 }
88 
89 struct page **etnaviv_gem_get_pages(struct etnaviv_gem_object *etnaviv_obj)
90 {
91 	int ret;
92 
93 	lockdep_assert_held(&etnaviv_obj->lock);
94 
95 	if (!etnaviv_obj->pages) {
96 		ret = etnaviv_obj->ops->get_pages(etnaviv_obj);
97 		if (ret < 0)
98 			return ERR_PTR(ret);
99 	}
100 
101 	if (!etnaviv_obj->sgt) {
102 		struct drm_device *dev = etnaviv_obj->base.dev;
103 		int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
104 		struct sg_table *sgt;
105 
106 		sgt = drm_prime_pages_to_sg(etnaviv_obj->pages, npages);
107 		if (IS_ERR(sgt)) {
108 			dev_err(dev->dev, "failed to allocate sgt: %ld\n",
109 				PTR_ERR(sgt));
110 			return ERR_CAST(sgt);
111 		}
112 
113 		etnaviv_obj->sgt = sgt;
114 
115 		etnaviv_gem_scatter_map(etnaviv_obj);
116 	}
117 
118 	return etnaviv_obj->pages;
119 }
120 
121 void etnaviv_gem_put_pages(struct etnaviv_gem_object *etnaviv_obj)
122 {
123 	lockdep_assert_held(&etnaviv_obj->lock);
124 	/* when we start tracking the pin count, then do something here */
125 }
126 
127 static int etnaviv_gem_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
128 		struct vm_area_struct *vma)
129 {
130 	pgprot_t vm_page_prot;
131 
132 	vma->vm_flags &= ~VM_PFNMAP;
133 	vma->vm_flags |= VM_MIXEDMAP;
134 
135 	vm_page_prot = vm_get_page_prot(vma->vm_flags);
136 
137 	if (etnaviv_obj->flags & ETNA_BO_WC) {
138 		vma->vm_page_prot = pgprot_writecombine(vm_page_prot);
139 	} else if (etnaviv_obj->flags & ETNA_BO_UNCACHED) {
140 		vma->vm_page_prot = pgprot_noncached(vm_page_prot);
141 	} else {
142 		/*
143 		 * Shunt off cached objs to shmem file so they have their own
144 		 * address_space (so unmap_mapping_range does what we want,
145 		 * in particular in the case of mmap'd dmabufs)
146 		 */
147 		fput(vma->vm_file);
148 		get_file(etnaviv_obj->base.filp);
149 		vma->vm_pgoff = 0;
150 		vma->vm_file  = etnaviv_obj->base.filp;
151 
152 		vma->vm_page_prot = vm_page_prot;
153 	}
154 
155 	return 0;
156 }
157 
158 int etnaviv_gem_mmap(struct file *filp, struct vm_area_struct *vma)
159 {
160 	struct etnaviv_gem_object *obj;
161 	int ret;
162 
163 	ret = drm_gem_mmap(filp, vma);
164 	if (ret) {
165 		DBG("mmap failed: %d", ret);
166 		return ret;
167 	}
168 
169 	obj = to_etnaviv_bo(vma->vm_private_data);
170 	return obj->ops->mmap(obj, vma);
171 }
172 
173 vm_fault_t etnaviv_gem_fault(struct vm_fault *vmf)
174 {
175 	struct vm_area_struct *vma = vmf->vma;
176 	struct drm_gem_object *obj = vma->vm_private_data;
177 	struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
178 	struct page **pages, *page;
179 	pgoff_t pgoff;
180 	int err;
181 
182 	/*
183 	 * Make sure we don't parallel update on a fault, nor move or remove
184 	 * something from beneath our feet.  Note that vmf_insert_page() is
185 	 * specifically coded to take care of this, so we don't have to.
186 	 */
187 	err = mutex_lock_interruptible(&etnaviv_obj->lock);
188 	if (err)
189 		return VM_FAULT_NOPAGE;
190 	/* make sure we have pages attached now */
191 	pages = etnaviv_gem_get_pages(etnaviv_obj);
192 	mutex_unlock(&etnaviv_obj->lock);
193 
194 	if (IS_ERR(pages)) {
195 		err = PTR_ERR(pages);
196 		return vmf_error(err);
197 	}
198 
199 	/* We don't use vmf->pgoff since that has the fake offset: */
200 	pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
201 
202 	page = pages[pgoff];
203 
204 	VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
205 	     page_to_pfn(page), page_to_pfn(page) << PAGE_SHIFT);
206 
207 	return vmf_insert_page(vma, vmf->address, page);
208 }
209 
210 int etnaviv_gem_mmap_offset(struct drm_gem_object *obj, u64 *offset)
211 {
212 	int ret;
213 
214 	/* Make it mmapable */
215 	ret = drm_gem_create_mmap_offset(obj);
216 	if (ret)
217 		dev_err(obj->dev->dev, "could not allocate mmap offset\n");
218 	else
219 		*offset = drm_vma_node_offset_addr(&obj->vma_node);
220 
221 	return ret;
222 }
223 
224 static struct etnaviv_vram_mapping *
225 etnaviv_gem_get_vram_mapping(struct etnaviv_gem_object *obj,
226 			     struct etnaviv_iommu_context *context)
227 {
228 	struct etnaviv_vram_mapping *mapping;
229 
230 	list_for_each_entry(mapping, &obj->vram_list, obj_node) {
231 		if (mapping->context == context)
232 			return mapping;
233 	}
234 
235 	return NULL;
236 }
237 
238 void etnaviv_gem_mapping_unreference(struct etnaviv_vram_mapping *mapping)
239 {
240 	struct etnaviv_gem_object *etnaviv_obj = mapping->object;
241 
242 	mutex_lock(&etnaviv_obj->lock);
243 	WARN_ON(mapping->use == 0);
244 	mapping->use -= 1;
245 	mutex_unlock(&etnaviv_obj->lock);
246 
247 	drm_gem_object_put(&etnaviv_obj->base);
248 }
249 
250 struct etnaviv_vram_mapping *etnaviv_gem_mapping_get(
251 	struct drm_gem_object *obj, struct etnaviv_iommu_context *mmu_context,
252 	u64 va)
253 {
254 	struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
255 	struct etnaviv_vram_mapping *mapping;
256 	struct page **pages;
257 	int ret = 0;
258 
259 	mutex_lock(&etnaviv_obj->lock);
260 	mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, mmu_context);
261 	if (mapping) {
262 		/*
263 		 * Holding the object lock prevents the use count changing
264 		 * beneath us.  If the use count is zero, the MMU might be
265 		 * reaping this object, so take the lock and re-check that
266 		 * the MMU owns this mapping to close this race.
267 		 */
268 		if (mapping->use == 0) {
269 			mutex_lock(&mmu_context->lock);
270 			if (mapping->context == mmu_context)
271 				mapping->use += 1;
272 			else
273 				mapping = NULL;
274 			mutex_unlock(&mmu_context->lock);
275 			if (mapping)
276 				goto out;
277 		} else {
278 			mapping->use += 1;
279 			goto out;
280 		}
281 	}
282 
283 	pages = etnaviv_gem_get_pages(etnaviv_obj);
284 	if (IS_ERR(pages)) {
285 		ret = PTR_ERR(pages);
286 		goto out;
287 	}
288 
289 	/*
290 	 * See if we have a reaped vram mapping we can re-use before
291 	 * allocating a fresh mapping.
292 	 */
293 	mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, NULL);
294 	if (!mapping) {
295 		mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
296 		if (!mapping) {
297 			ret = -ENOMEM;
298 			goto out;
299 		}
300 
301 		INIT_LIST_HEAD(&mapping->scan_node);
302 		mapping->object = etnaviv_obj;
303 	} else {
304 		list_del(&mapping->obj_node);
305 	}
306 
307 	etnaviv_iommu_context_get(mmu_context);
308 	mapping->context = mmu_context;
309 	mapping->use = 1;
310 
311 	ret = etnaviv_iommu_map_gem(mmu_context, etnaviv_obj,
312 				    mmu_context->global->memory_base,
313 				    mapping, va);
314 	if (ret < 0) {
315 		etnaviv_iommu_context_put(mmu_context);
316 		kfree(mapping);
317 	} else {
318 		list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list);
319 	}
320 
321 out:
322 	mutex_unlock(&etnaviv_obj->lock);
323 
324 	if (ret)
325 		return ERR_PTR(ret);
326 
327 	/* Take a reference on the object */
328 	drm_gem_object_get(obj);
329 	return mapping;
330 }
331 
332 void *etnaviv_gem_vmap(struct drm_gem_object *obj)
333 {
334 	struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
335 
336 	if (etnaviv_obj->vaddr)
337 		return etnaviv_obj->vaddr;
338 
339 	mutex_lock(&etnaviv_obj->lock);
340 	/*
341 	 * Need to check again, as we might have raced with another thread
342 	 * while waiting for the mutex.
343 	 */
344 	if (!etnaviv_obj->vaddr)
345 		etnaviv_obj->vaddr = etnaviv_obj->ops->vmap(etnaviv_obj);
346 	mutex_unlock(&etnaviv_obj->lock);
347 
348 	return etnaviv_obj->vaddr;
349 }
350 
351 static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj)
352 {
353 	struct page **pages;
354 
355 	lockdep_assert_held(&obj->lock);
356 
357 	pages = etnaviv_gem_get_pages(obj);
358 	if (IS_ERR(pages))
359 		return NULL;
360 
361 	return vmap(pages, obj->base.size >> PAGE_SHIFT,
362 			VM_MAP, pgprot_writecombine(PAGE_KERNEL));
363 }
364 
365 static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op)
366 {
367 	if (op & ETNA_PREP_READ)
368 		return DMA_FROM_DEVICE;
369 	else if (op & ETNA_PREP_WRITE)
370 		return DMA_TO_DEVICE;
371 	else
372 		return DMA_BIDIRECTIONAL;
373 }
374 
375 int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op,
376 		struct drm_etnaviv_timespec *timeout)
377 {
378 	struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
379 	struct drm_device *dev = obj->dev;
380 	bool write = !!(op & ETNA_PREP_WRITE);
381 	int ret;
382 
383 	if (!etnaviv_obj->sgt) {
384 		void *ret;
385 
386 		mutex_lock(&etnaviv_obj->lock);
387 		ret = etnaviv_gem_get_pages(etnaviv_obj);
388 		mutex_unlock(&etnaviv_obj->lock);
389 		if (IS_ERR(ret))
390 			return PTR_ERR(ret);
391 	}
392 
393 	if (op & ETNA_PREP_NOSYNC) {
394 		if (!dma_resv_test_signaled_rcu(obj->resv,
395 							  write))
396 			return -EBUSY;
397 	} else {
398 		unsigned long remain = etnaviv_timeout_to_jiffies(timeout);
399 
400 		ret = dma_resv_wait_timeout_rcu(obj->resv,
401 							  write, true, remain);
402 		if (ret <= 0)
403 			return ret == 0 ? -ETIMEDOUT : ret;
404 	}
405 
406 	if (etnaviv_obj->flags & ETNA_BO_CACHED) {
407 		dma_sync_sg_for_cpu(dev->dev, etnaviv_obj->sgt->sgl,
408 				    etnaviv_obj->sgt->nents,
409 				    etnaviv_op_to_dma_dir(op));
410 		etnaviv_obj->last_cpu_prep_op = op;
411 	}
412 
413 	return 0;
414 }
415 
416 int etnaviv_gem_cpu_fini(struct drm_gem_object *obj)
417 {
418 	struct drm_device *dev = obj->dev;
419 	struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
420 
421 	if (etnaviv_obj->flags & ETNA_BO_CACHED) {
422 		/* fini without a prep is almost certainly a userspace error */
423 		WARN_ON(etnaviv_obj->last_cpu_prep_op == 0);
424 		dma_sync_sg_for_device(dev->dev, etnaviv_obj->sgt->sgl,
425 			etnaviv_obj->sgt->nents,
426 			etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op));
427 		etnaviv_obj->last_cpu_prep_op = 0;
428 	}
429 
430 	return 0;
431 }
432 
433 int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj,
434 	struct drm_etnaviv_timespec *timeout)
435 {
436 	struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
437 
438 	return etnaviv_gpu_wait_obj_inactive(gpu, etnaviv_obj, timeout);
439 }
440 
441 #ifdef CONFIG_DEBUG_FS
442 static void etnaviv_gem_describe_fence(struct dma_fence *fence,
443 	const char *type, struct seq_file *m)
444 {
445 	if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags))
446 		seq_printf(m, "\t%9s: %s %s seq %llu\n",
447 			   type,
448 			   fence->ops->get_driver_name(fence),
449 			   fence->ops->get_timeline_name(fence),
450 			   fence->seqno);
451 }
452 
453 static void etnaviv_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
454 {
455 	struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
456 	struct dma_resv *robj = obj->resv;
457 	struct dma_resv_list *fobj;
458 	struct dma_fence *fence;
459 	unsigned long off = drm_vma_node_start(&obj->vma_node);
460 
461 	seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n",
462 			etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I',
463 			obj->name, kref_read(&obj->refcount),
464 			off, etnaviv_obj->vaddr, obj->size);
465 
466 	rcu_read_lock();
467 	fobj = rcu_dereference(robj->fence);
468 	if (fobj) {
469 		unsigned int i, shared_count = fobj->shared_count;
470 
471 		for (i = 0; i < shared_count; i++) {
472 			fence = rcu_dereference(fobj->shared[i]);
473 			etnaviv_gem_describe_fence(fence, "Shared", m);
474 		}
475 	}
476 
477 	fence = rcu_dereference(robj->fence_excl);
478 	if (fence)
479 		etnaviv_gem_describe_fence(fence, "Exclusive", m);
480 	rcu_read_unlock();
481 }
482 
483 void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv,
484 	struct seq_file *m)
485 {
486 	struct etnaviv_gem_object *etnaviv_obj;
487 	int count = 0;
488 	size_t size = 0;
489 
490 	mutex_lock(&priv->gem_lock);
491 	list_for_each_entry(etnaviv_obj, &priv->gem_list, gem_node) {
492 		struct drm_gem_object *obj = &etnaviv_obj->base;
493 
494 		seq_puts(m, "   ");
495 		etnaviv_gem_describe(obj, m);
496 		count++;
497 		size += obj->size;
498 	}
499 	mutex_unlock(&priv->gem_lock);
500 
501 	seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
502 }
503 #endif
504 
505 static void etnaviv_gem_shmem_release(struct etnaviv_gem_object *etnaviv_obj)
506 {
507 	vunmap(etnaviv_obj->vaddr);
508 	put_pages(etnaviv_obj);
509 }
510 
511 static const struct etnaviv_gem_ops etnaviv_gem_shmem_ops = {
512 	.get_pages = etnaviv_gem_shmem_get_pages,
513 	.release = etnaviv_gem_shmem_release,
514 	.vmap = etnaviv_gem_vmap_impl,
515 	.mmap = etnaviv_gem_mmap_obj,
516 };
517 
518 void etnaviv_gem_free_object(struct drm_gem_object *obj)
519 {
520 	struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
521 	struct etnaviv_drm_private *priv = obj->dev->dev_private;
522 	struct etnaviv_vram_mapping *mapping, *tmp;
523 
524 	/* object should not be active */
525 	WARN_ON(is_active(etnaviv_obj));
526 
527 	mutex_lock(&priv->gem_lock);
528 	list_del(&etnaviv_obj->gem_node);
529 	mutex_unlock(&priv->gem_lock);
530 
531 	list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list,
532 				 obj_node) {
533 		struct etnaviv_iommu_context *context = mapping->context;
534 
535 		WARN_ON(mapping->use);
536 
537 		if (context) {
538 			etnaviv_iommu_unmap_gem(context, mapping);
539 			etnaviv_iommu_context_put(context);
540 		}
541 
542 		list_del(&mapping->obj_node);
543 		kfree(mapping);
544 	}
545 
546 	drm_gem_free_mmap_offset(obj);
547 	etnaviv_obj->ops->release(etnaviv_obj);
548 	drm_gem_object_release(obj);
549 
550 	kfree(etnaviv_obj);
551 }
552 
553 void etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj)
554 {
555 	struct etnaviv_drm_private *priv = dev->dev_private;
556 	struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
557 
558 	mutex_lock(&priv->gem_lock);
559 	list_add_tail(&etnaviv_obj->gem_node, &priv->gem_list);
560 	mutex_unlock(&priv->gem_lock);
561 }
562 
563 static int etnaviv_gem_new_impl(struct drm_device *dev, u32 size, u32 flags,
564 	const struct etnaviv_gem_ops *ops, struct drm_gem_object **obj)
565 {
566 	struct etnaviv_gem_object *etnaviv_obj;
567 	unsigned sz = sizeof(*etnaviv_obj);
568 	bool valid = true;
569 
570 	/* validate flags */
571 	switch (flags & ETNA_BO_CACHE_MASK) {
572 	case ETNA_BO_UNCACHED:
573 	case ETNA_BO_CACHED:
574 	case ETNA_BO_WC:
575 		break;
576 	default:
577 		valid = false;
578 	}
579 
580 	if (!valid) {
581 		dev_err(dev->dev, "invalid cache flag: %x\n",
582 			(flags & ETNA_BO_CACHE_MASK));
583 		return -EINVAL;
584 	}
585 
586 	etnaviv_obj = kzalloc(sz, GFP_KERNEL);
587 	if (!etnaviv_obj)
588 		return -ENOMEM;
589 
590 	etnaviv_obj->flags = flags;
591 	etnaviv_obj->ops = ops;
592 
593 	mutex_init(&etnaviv_obj->lock);
594 	INIT_LIST_HEAD(&etnaviv_obj->vram_list);
595 
596 	*obj = &etnaviv_obj->base;
597 
598 	return 0;
599 }
600 
601 /* convenience method to construct a GEM buffer object, and userspace handle */
602 int etnaviv_gem_new_handle(struct drm_device *dev, struct drm_file *file,
603 	u32 size, u32 flags, u32 *handle)
604 {
605 	struct etnaviv_drm_private *priv = dev->dev_private;
606 	struct drm_gem_object *obj = NULL;
607 	int ret;
608 
609 	size = PAGE_ALIGN(size);
610 
611 	ret = etnaviv_gem_new_impl(dev, size, flags,
612 				   &etnaviv_gem_shmem_ops, &obj);
613 	if (ret)
614 		goto fail;
615 
616 	lockdep_set_class(&to_etnaviv_bo(obj)->lock, &etnaviv_shm_lock_class);
617 
618 	ret = drm_gem_object_init(dev, obj, size);
619 	if (ret)
620 		goto fail;
621 
622 	/*
623 	 * Our buffers are kept pinned, so allocating them from the MOVABLE
624 	 * zone is a really bad idea, and conflicts with CMA. See comments
625 	 * above new_inode() why this is required _and_ expected if you're
626 	 * going to pin these pages.
627 	 */
628 	mapping_set_gfp_mask(obj->filp->f_mapping, priv->shm_gfp_mask);
629 
630 	etnaviv_gem_obj_add(dev, obj);
631 
632 	ret = drm_gem_handle_create(file, obj, handle);
633 
634 	/* drop reference from allocate - handle holds it now */
635 fail:
636 	drm_gem_object_put(obj);
637 
638 	return ret;
639 }
640 
641 int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags,
642 	const struct etnaviv_gem_ops *ops, struct etnaviv_gem_object **res)
643 {
644 	struct drm_gem_object *obj;
645 	int ret;
646 
647 	ret = etnaviv_gem_new_impl(dev, size, flags, ops, &obj);
648 	if (ret)
649 		return ret;
650 
651 	drm_gem_private_object_init(dev, obj, size);
652 
653 	*res = to_etnaviv_bo(obj);
654 
655 	return 0;
656 }
657 
658 static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj)
659 {
660 	struct page **pvec = NULL;
661 	struct etnaviv_gem_userptr *userptr = &etnaviv_obj->userptr;
662 	int ret, pinned = 0, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
663 
664 	might_lock_read(&current->mm->mmap_lock);
665 
666 	if (userptr->mm != current->mm)
667 		return -EPERM;
668 
669 	pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
670 	if (!pvec)
671 		return -ENOMEM;
672 
673 	do {
674 		unsigned num_pages = npages - pinned;
675 		uint64_t ptr = userptr->ptr + pinned * PAGE_SIZE;
676 		struct page **pages = pvec + pinned;
677 
678 		ret = pin_user_pages_fast(ptr, num_pages,
679 					  !userptr->ro ? FOLL_WRITE : 0, pages);
680 		if (ret < 0) {
681 			unpin_user_pages(pvec, pinned);
682 			kvfree(pvec);
683 			return ret;
684 		}
685 
686 		pinned += ret;
687 
688 	} while (pinned < npages);
689 
690 	etnaviv_obj->pages = pvec;
691 
692 	return 0;
693 }
694 
695 static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj)
696 {
697 	if (etnaviv_obj->sgt) {
698 		etnaviv_gem_scatterlist_unmap(etnaviv_obj);
699 		sg_free_table(etnaviv_obj->sgt);
700 		kfree(etnaviv_obj->sgt);
701 	}
702 	if (etnaviv_obj->pages) {
703 		int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
704 
705 		unpin_user_pages(etnaviv_obj->pages, npages);
706 		kvfree(etnaviv_obj->pages);
707 	}
708 }
709 
710 static int etnaviv_gem_userptr_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
711 		struct vm_area_struct *vma)
712 {
713 	return -EINVAL;
714 }
715 
716 static const struct etnaviv_gem_ops etnaviv_gem_userptr_ops = {
717 	.get_pages = etnaviv_gem_userptr_get_pages,
718 	.release = etnaviv_gem_userptr_release,
719 	.vmap = etnaviv_gem_vmap_impl,
720 	.mmap = etnaviv_gem_userptr_mmap_obj,
721 };
722 
723 int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file,
724 	uintptr_t ptr, u32 size, u32 flags, u32 *handle)
725 {
726 	struct etnaviv_gem_object *etnaviv_obj;
727 	int ret;
728 
729 	ret = etnaviv_gem_new_private(dev, size, ETNA_BO_CACHED,
730 				      &etnaviv_gem_userptr_ops, &etnaviv_obj);
731 	if (ret)
732 		return ret;
733 
734 	lockdep_set_class(&etnaviv_obj->lock, &etnaviv_userptr_lock_class);
735 
736 	etnaviv_obj->userptr.ptr = ptr;
737 	etnaviv_obj->userptr.mm = current->mm;
738 	etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE);
739 
740 	etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
741 
742 	ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle);
743 
744 	/* drop reference from allocate - handle holds it now */
745 	drm_gem_object_put(&etnaviv_obj->base);
746 	return ret;
747 }
748