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[mirror_ubuntu-jammy-kernel.git] / drivers / gpu / drm / etnaviv / etnaviv_gem.c
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_sgtable(dev->dev, sgt, DMA_BIDIRECTIONAL, 0);
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_sgtable(dev->dev, sgt, DMA_BIDIRECTIONAL, 0);
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->base.dev,
107 etnaviv_obj->pages, npages);
108 if (IS_ERR(sgt)) {
109 dev_err(dev->dev, "failed to allocate sgt: %ld\n",
110 PTR_ERR(sgt));
111 return ERR_CAST(sgt);
112 }
113
114 etnaviv_obj->sgt = sgt;
115
116 etnaviv_gem_scatter_map(etnaviv_obj);
117 }
118
119 return etnaviv_obj->pages;
120 }
121
122 void etnaviv_gem_put_pages(struct etnaviv_gem_object *etnaviv_obj)
123 {
124 lockdep_assert_held(&etnaviv_obj->lock);
125 /* when we start tracking the pin count, then do something here */
126 }
127
128 static int etnaviv_gem_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
129 struct vm_area_struct *vma)
130 {
131 pgprot_t vm_page_prot;
132
133 vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTDUMP;
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 vma->vm_pgoff = 0;
148 vma_set_file(vma, etnaviv_obj->base.filp);
149
150 vma->vm_page_prot = vm_page_prot;
151 }
152
153 return 0;
154 }
155
156 static int etnaviv_gem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
157 {
158 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
159
160 return etnaviv_obj->ops->mmap(etnaviv_obj, vma);
161 }
162
163 static vm_fault_t etnaviv_gem_fault(struct vm_fault *vmf)
164 {
165 struct vm_area_struct *vma = vmf->vma;
166 struct drm_gem_object *obj = vma->vm_private_data;
167 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
168 struct page **pages, *page;
169 pgoff_t pgoff;
170 int err;
171
172 /*
173 * Make sure we don't parallel update on a fault, nor move or remove
174 * something from beneath our feet. Note that vmf_insert_page() is
175 * specifically coded to take care of this, so we don't have to.
176 */
177 err = mutex_lock_interruptible(&etnaviv_obj->lock);
178 if (err)
179 return VM_FAULT_NOPAGE;
180 /* make sure we have pages attached now */
181 pages = etnaviv_gem_get_pages(etnaviv_obj);
182 mutex_unlock(&etnaviv_obj->lock);
183
184 if (IS_ERR(pages)) {
185 err = PTR_ERR(pages);
186 return vmf_error(err);
187 }
188
189 /* We don't use vmf->pgoff since that has the fake offset: */
190 pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
191
192 page = pages[pgoff];
193
194 VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
195 page_to_pfn(page), page_to_pfn(page) << PAGE_SHIFT);
196
197 return vmf_insert_page(vma, vmf->address, page);
198 }
199
200 int etnaviv_gem_mmap_offset(struct drm_gem_object *obj, u64 *offset)
201 {
202 int ret;
203
204 /* Make it mmapable */
205 ret = drm_gem_create_mmap_offset(obj);
206 if (ret)
207 dev_err(obj->dev->dev, "could not allocate mmap offset\n");
208 else
209 *offset = drm_vma_node_offset_addr(&obj->vma_node);
210
211 return ret;
212 }
213
214 static struct etnaviv_vram_mapping *
215 etnaviv_gem_get_vram_mapping(struct etnaviv_gem_object *obj,
216 struct etnaviv_iommu_context *context)
217 {
218 struct etnaviv_vram_mapping *mapping;
219
220 list_for_each_entry(mapping, &obj->vram_list, obj_node) {
221 if (mapping->context == context)
222 return mapping;
223 }
224
225 return NULL;
226 }
227
228 void etnaviv_gem_mapping_unreference(struct etnaviv_vram_mapping *mapping)
229 {
230 struct etnaviv_gem_object *etnaviv_obj = mapping->object;
231
232 mutex_lock(&etnaviv_obj->lock);
233 WARN_ON(mapping->use == 0);
234 mapping->use -= 1;
235 mutex_unlock(&etnaviv_obj->lock);
236
237 drm_gem_object_put(&etnaviv_obj->base);
238 }
239
240 struct etnaviv_vram_mapping *etnaviv_gem_mapping_get(
241 struct drm_gem_object *obj, struct etnaviv_iommu_context *mmu_context,
242 u64 va)
243 {
244 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
245 struct etnaviv_vram_mapping *mapping;
246 struct page **pages;
247 int ret = 0;
248
249 mutex_lock(&etnaviv_obj->lock);
250 mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, mmu_context);
251 if (mapping) {
252 /*
253 * Holding the object lock prevents the use count changing
254 * beneath us. If the use count is zero, the MMU might be
255 * reaping this object, so take the lock and re-check that
256 * the MMU owns this mapping to close this race.
257 */
258 if (mapping->use == 0) {
259 mutex_lock(&mmu_context->lock);
260 if (mapping->context == mmu_context)
261 mapping->use += 1;
262 else
263 mapping = NULL;
264 mutex_unlock(&mmu_context->lock);
265 if (mapping)
266 goto out;
267 } else {
268 mapping->use += 1;
269 goto out;
270 }
271 }
272
273 pages = etnaviv_gem_get_pages(etnaviv_obj);
274 if (IS_ERR(pages)) {
275 ret = PTR_ERR(pages);
276 goto out;
277 }
278
279 /*
280 * See if we have a reaped vram mapping we can re-use before
281 * allocating a fresh mapping.
282 */
283 mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, NULL);
284 if (!mapping) {
285 mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
286 if (!mapping) {
287 ret = -ENOMEM;
288 goto out;
289 }
290
291 INIT_LIST_HEAD(&mapping->scan_node);
292 mapping->object = etnaviv_obj;
293 } else {
294 list_del(&mapping->obj_node);
295 }
296
297 etnaviv_iommu_context_get(mmu_context);
298 mapping->context = mmu_context;
299 mapping->use = 1;
300
301 ret = etnaviv_iommu_map_gem(mmu_context, etnaviv_obj,
302 mmu_context->global->memory_base,
303 mapping, va);
304 if (ret < 0) {
305 etnaviv_iommu_context_put(mmu_context);
306 kfree(mapping);
307 } else {
308 list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list);
309 }
310
311 out:
312 mutex_unlock(&etnaviv_obj->lock);
313
314 if (ret)
315 return ERR_PTR(ret);
316
317 /* Take a reference on the object */
318 drm_gem_object_get(obj);
319 return mapping;
320 }
321
322 void *etnaviv_gem_vmap(struct drm_gem_object *obj)
323 {
324 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
325
326 if (etnaviv_obj->vaddr)
327 return etnaviv_obj->vaddr;
328
329 mutex_lock(&etnaviv_obj->lock);
330 /*
331 * Need to check again, as we might have raced with another thread
332 * while waiting for the mutex.
333 */
334 if (!etnaviv_obj->vaddr)
335 etnaviv_obj->vaddr = etnaviv_obj->ops->vmap(etnaviv_obj);
336 mutex_unlock(&etnaviv_obj->lock);
337
338 return etnaviv_obj->vaddr;
339 }
340
341 static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj)
342 {
343 struct page **pages;
344
345 lockdep_assert_held(&obj->lock);
346
347 pages = etnaviv_gem_get_pages(obj);
348 if (IS_ERR(pages))
349 return NULL;
350
351 return vmap(pages, obj->base.size >> PAGE_SHIFT,
352 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
353 }
354
355 static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op)
356 {
357 if (op & ETNA_PREP_READ)
358 return DMA_FROM_DEVICE;
359 else if (op & ETNA_PREP_WRITE)
360 return DMA_TO_DEVICE;
361 else
362 return DMA_BIDIRECTIONAL;
363 }
364
365 int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op,
366 struct drm_etnaviv_timespec *timeout)
367 {
368 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
369 struct drm_device *dev = obj->dev;
370 bool write = !!(op & ETNA_PREP_WRITE);
371 int ret;
372
373 if (!etnaviv_obj->sgt) {
374 void *ret;
375
376 mutex_lock(&etnaviv_obj->lock);
377 ret = etnaviv_gem_get_pages(etnaviv_obj);
378 mutex_unlock(&etnaviv_obj->lock);
379 if (IS_ERR(ret))
380 return PTR_ERR(ret);
381 }
382
383 if (op & ETNA_PREP_NOSYNC) {
384 if (!dma_resv_test_signaled(obj->resv, write))
385 return -EBUSY;
386 } else {
387 unsigned long remain = etnaviv_timeout_to_jiffies(timeout);
388
389 ret = dma_resv_wait_timeout(obj->resv, write, true, remain);
390 if (ret <= 0)
391 return ret == 0 ? -ETIMEDOUT : ret;
392 }
393
394 if (etnaviv_obj->flags & ETNA_BO_CACHED) {
395 dma_sync_sgtable_for_cpu(dev->dev, etnaviv_obj->sgt,
396 etnaviv_op_to_dma_dir(op));
397 etnaviv_obj->last_cpu_prep_op = op;
398 }
399
400 return 0;
401 }
402
403 int etnaviv_gem_cpu_fini(struct drm_gem_object *obj)
404 {
405 struct drm_device *dev = obj->dev;
406 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
407
408 if (etnaviv_obj->flags & ETNA_BO_CACHED) {
409 /* fini without a prep is almost certainly a userspace error */
410 WARN_ON(etnaviv_obj->last_cpu_prep_op == 0);
411 dma_sync_sgtable_for_device(dev->dev, etnaviv_obj->sgt,
412 etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op));
413 etnaviv_obj->last_cpu_prep_op = 0;
414 }
415
416 return 0;
417 }
418
419 int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj,
420 struct drm_etnaviv_timespec *timeout)
421 {
422 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
423
424 return etnaviv_gpu_wait_obj_inactive(gpu, etnaviv_obj, timeout);
425 }
426
427 #ifdef CONFIG_DEBUG_FS
428 static void etnaviv_gem_describe_fence(struct dma_fence *fence,
429 const char *type, struct seq_file *m)
430 {
431 if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags))
432 seq_printf(m, "\t%9s: %s %s seq %llu\n",
433 type,
434 fence->ops->get_driver_name(fence),
435 fence->ops->get_timeline_name(fence),
436 fence->seqno);
437 }
438
439 static void etnaviv_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
440 {
441 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
442 struct dma_resv *robj = obj->resv;
443 struct dma_resv_list *fobj;
444 struct dma_fence *fence;
445 unsigned long off = drm_vma_node_start(&obj->vma_node);
446
447 seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n",
448 etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I',
449 obj->name, kref_read(&obj->refcount),
450 off, etnaviv_obj->vaddr, obj->size);
451
452 rcu_read_lock();
453 fobj = dma_resv_shared_list(robj);
454 if (fobj) {
455 unsigned int i, shared_count = fobj->shared_count;
456
457 for (i = 0; i < shared_count; i++) {
458 fence = rcu_dereference(fobj->shared[i]);
459 etnaviv_gem_describe_fence(fence, "Shared", m);
460 }
461 }
462
463 fence = dma_resv_excl_fence(robj);
464 if (fence)
465 etnaviv_gem_describe_fence(fence, "Exclusive", m);
466 rcu_read_unlock();
467 }
468
469 void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv,
470 struct seq_file *m)
471 {
472 struct etnaviv_gem_object *etnaviv_obj;
473 int count = 0;
474 size_t size = 0;
475
476 mutex_lock(&priv->gem_lock);
477 list_for_each_entry(etnaviv_obj, &priv->gem_list, gem_node) {
478 struct drm_gem_object *obj = &etnaviv_obj->base;
479
480 seq_puts(m, " ");
481 etnaviv_gem_describe(obj, m);
482 count++;
483 size += obj->size;
484 }
485 mutex_unlock(&priv->gem_lock);
486
487 seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
488 }
489 #endif
490
491 static void etnaviv_gem_shmem_release(struct etnaviv_gem_object *etnaviv_obj)
492 {
493 vunmap(etnaviv_obj->vaddr);
494 put_pages(etnaviv_obj);
495 }
496
497 static const struct etnaviv_gem_ops etnaviv_gem_shmem_ops = {
498 .get_pages = etnaviv_gem_shmem_get_pages,
499 .release = etnaviv_gem_shmem_release,
500 .vmap = etnaviv_gem_vmap_impl,
501 .mmap = etnaviv_gem_mmap_obj,
502 };
503
504 void etnaviv_gem_free_object(struct drm_gem_object *obj)
505 {
506 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
507 struct etnaviv_drm_private *priv = obj->dev->dev_private;
508 struct etnaviv_vram_mapping *mapping, *tmp;
509
510 /* object should not be active */
511 WARN_ON(is_active(etnaviv_obj));
512
513 mutex_lock(&priv->gem_lock);
514 list_del(&etnaviv_obj->gem_node);
515 mutex_unlock(&priv->gem_lock);
516
517 list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list,
518 obj_node) {
519 struct etnaviv_iommu_context *context = mapping->context;
520
521 WARN_ON(mapping->use);
522
523 if (context) {
524 etnaviv_iommu_unmap_gem(context, mapping);
525 etnaviv_iommu_context_put(context);
526 }
527
528 list_del(&mapping->obj_node);
529 kfree(mapping);
530 }
531
532 drm_gem_free_mmap_offset(obj);
533 etnaviv_obj->ops->release(etnaviv_obj);
534 drm_gem_object_release(obj);
535
536 kfree(etnaviv_obj);
537 }
538
539 void etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj)
540 {
541 struct etnaviv_drm_private *priv = dev->dev_private;
542 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
543
544 mutex_lock(&priv->gem_lock);
545 list_add_tail(&etnaviv_obj->gem_node, &priv->gem_list);
546 mutex_unlock(&priv->gem_lock);
547 }
548
549 static const struct vm_operations_struct vm_ops = {
550 .fault = etnaviv_gem_fault,
551 .open = drm_gem_vm_open,
552 .close = drm_gem_vm_close,
553 };
554
555 static const struct drm_gem_object_funcs etnaviv_gem_object_funcs = {
556 .free = etnaviv_gem_free_object,
557 .pin = etnaviv_gem_prime_pin,
558 .unpin = etnaviv_gem_prime_unpin,
559 .get_sg_table = etnaviv_gem_prime_get_sg_table,
560 .vmap = etnaviv_gem_prime_vmap,
561 .mmap = etnaviv_gem_mmap,
562 .vm_ops = &vm_ops,
563 };
564
565 static int etnaviv_gem_new_impl(struct drm_device *dev, u32 size, u32 flags,
566 const struct etnaviv_gem_ops *ops, struct drm_gem_object **obj)
567 {
568 struct etnaviv_gem_object *etnaviv_obj;
569 unsigned sz = sizeof(*etnaviv_obj);
570 bool valid = true;
571
572 /* validate flags */
573 switch (flags & ETNA_BO_CACHE_MASK) {
574 case ETNA_BO_UNCACHED:
575 case ETNA_BO_CACHED:
576 case ETNA_BO_WC:
577 break;
578 default:
579 valid = false;
580 }
581
582 if (!valid) {
583 dev_err(dev->dev, "invalid cache flag: %x\n",
584 (flags & ETNA_BO_CACHE_MASK));
585 return -EINVAL;
586 }
587
588 etnaviv_obj = kzalloc(sz, GFP_KERNEL);
589 if (!etnaviv_obj)
590 return -ENOMEM;
591
592 etnaviv_obj->flags = flags;
593 etnaviv_obj->ops = ops;
594
595 mutex_init(&etnaviv_obj->lock);
596 INIT_LIST_HEAD(&etnaviv_obj->vram_list);
597
598 *obj = &etnaviv_obj->base;
599 (*obj)->funcs = &etnaviv_gem_object_funcs;
600
601 return 0;
602 }
603
604 /* convenience method to construct a GEM buffer object, and userspace handle */
605 int etnaviv_gem_new_handle(struct drm_device *dev, struct drm_file *file,
606 u32 size, u32 flags, u32 *handle)
607 {
608 struct etnaviv_drm_private *priv = dev->dev_private;
609 struct drm_gem_object *obj = NULL;
610 int ret;
611
612 size = PAGE_ALIGN(size);
613
614 ret = etnaviv_gem_new_impl(dev, size, flags,
615 &etnaviv_gem_shmem_ops, &obj);
616 if (ret)
617 goto fail;
618
619 lockdep_set_class(&to_etnaviv_bo(obj)->lock, &etnaviv_shm_lock_class);
620
621 ret = drm_gem_object_init(dev, obj, size);
622 if (ret)
623 goto fail;
624
625 /*
626 * Our buffers are kept pinned, so allocating them from the MOVABLE
627 * zone is a really bad idea, and conflicts with CMA. See comments
628 * above new_inode() why this is required _and_ expected if you're
629 * going to pin these pages.
630 */
631 mapping_set_gfp_mask(obj->filp->f_mapping, priv->shm_gfp_mask);
632
633 etnaviv_gem_obj_add(dev, obj);
634
635 ret = drm_gem_handle_create(file, obj, handle);
636
637 /* drop reference from allocate - handle holds it now */
638 fail:
639 drm_gem_object_put(obj);
640
641 return ret;
642 }
643
644 int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags,
645 const struct etnaviv_gem_ops *ops, struct etnaviv_gem_object **res)
646 {
647 struct drm_gem_object *obj;
648 int ret;
649
650 ret = etnaviv_gem_new_impl(dev, size, flags, ops, &obj);
651 if (ret)
652 return ret;
653
654 drm_gem_private_object_init(dev, obj, size);
655
656 *res = to_etnaviv_bo(obj);
657
658 return 0;
659 }
660
661 static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj)
662 {
663 struct page **pvec = NULL;
664 struct etnaviv_gem_userptr *userptr = &etnaviv_obj->userptr;
665 int ret, pinned = 0, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
666
667 might_lock_read(&current->mm->mmap_lock);
668
669 if (userptr->mm != current->mm)
670 return -EPERM;
671
672 pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
673 if (!pvec)
674 return -ENOMEM;
675
676 do {
677 unsigned num_pages = npages - pinned;
678 uint64_t ptr = userptr->ptr + pinned * PAGE_SIZE;
679 struct page **pages = pvec + pinned;
680
681 ret = pin_user_pages_fast(ptr, num_pages,
682 FOLL_WRITE | FOLL_FORCE | FOLL_LONGTERM,
683 pages);
684 if (ret < 0) {
685 unpin_user_pages(pvec, pinned);
686 kvfree(pvec);
687 return ret;
688 }
689
690 pinned += ret;
691
692 } while (pinned < npages);
693
694 etnaviv_obj->pages = pvec;
695
696 return 0;
697 }
698
699 static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj)
700 {
701 if (etnaviv_obj->sgt) {
702 etnaviv_gem_scatterlist_unmap(etnaviv_obj);
703 sg_free_table(etnaviv_obj->sgt);
704 kfree(etnaviv_obj->sgt);
705 }
706 if (etnaviv_obj->pages) {
707 int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
708
709 unpin_user_pages(etnaviv_obj->pages, npages);
710 kvfree(etnaviv_obj->pages);
711 }
712 }
713
714 static int etnaviv_gem_userptr_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
715 struct vm_area_struct *vma)
716 {
717 return -EINVAL;
718 }
719
720 static const struct etnaviv_gem_ops etnaviv_gem_userptr_ops = {
721 .get_pages = etnaviv_gem_userptr_get_pages,
722 .release = etnaviv_gem_userptr_release,
723 .vmap = etnaviv_gem_vmap_impl,
724 .mmap = etnaviv_gem_userptr_mmap_obj,
725 };
726
727 int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file,
728 uintptr_t ptr, u32 size, u32 flags, u32 *handle)
729 {
730 struct etnaviv_gem_object *etnaviv_obj;
731 int ret;
732
733 ret = etnaviv_gem_new_private(dev, size, ETNA_BO_CACHED,
734 &etnaviv_gem_userptr_ops, &etnaviv_obj);
735 if (ret)
736 return ret;
737
738 lockdep_set_class(&etnaviv_obj->lock, &etnaviv_userptr_lock_class);
739
740 etnaviv_obj->userptr.ptr = ptr;
741 etnaviv_obj->userptr.mm = current->mm;
742 etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE);
743
744 etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
745
746 ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle);
747
748 /* drop reference from allocate - handle holds it now */
749 drm_gem_object_put(&etnaviv_obj->base);
750 return ret;
751 }