drm/etnaviv: add clock gating workaround for GC7000 r6202
[linux-2.6-microblaze.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_PFNMAP;
134         vma->vm_flags |= VM_MIXEDMAP;
135
136         vm_page_prot = vm_get_page_prot(vma->vm_flags);
137
138         if (etnaviv_obj->flags & ETNA_BO_WC) {
139                 vma->vm_page_prot = pgprot_writecombine(vm_page_prot);
140         } else if (etnaviv_obj->flags & ETNA_BO_UNCACHED) {
141                 vma->vm_page_prot = pgprot_noncached(vm_page_prot);
142         } else {
143                 /*
144                  * Shunt off cached objs to shmem file so they have their own
145                  * address_space (so unmap_mapping_range does what we want,
146                  * in particular in the case of mmap'd dmabufs)
147                  */
148                 vma->vm_pgoff = 0;
149                 vma_set_file(vma, etnaviv_obj->base.filp);
150
151                 vma->vm_page_prot = vm_page_prot;
152         }
153
154         return 0;
155 }
156
157 int etnaviv_gem_mmap(struct file *filp, struct vm_area_struct *vma)
158 {
159         struct etnaviv_gem_object *obj;
160         int ret;
161
162         ret = drm_gem_mmap(filp, vma);
163         if (ret) {
164                 DBG("mmap failed: %d", ret);
165                 return ret;
166         }
167
168         obj = to_etnaviv_bo(vma->vm_private_data);
169         return obj->ops->mmap(obj, vma);
170 }
171
172 static vm_fault_t etnaviv_gem_fault(struct vm_fault *vmf)
173 {
174         struct vm_area_struct *vma = vmf->vma;
175         struct drm_gem_object *obj = vma->vm_private_data;
176         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
177         struct page **pages, *page;
178         pgoff_t pgoff;
179         int err;
180
181         /*
182          * Make sure we don't parallel update on a fault, nor move or remove
183          * something from beneath our feet.  Note that vmf_insert_page() is
184          * specifically coded to take care of this, so we don't have to.
185          */
186         err = mutex_lock_interruptible(&etnaviv_obj->lock);
187         if (err)
188                 return VM_FAULT_NOPAGE;
189         /* make sure we have pages attached now */
190         pages = etnaviv_gem_get_pages(etnaviv_obj);
191         mutex_unlock(&etnaviv_obj->lock);
192
193         if (IS_ERR(pages)) {
194                 err = PTR_ERR(pages);
195                 return vmf_error(err);
196         }
197
198         /* We don't use vmf->pgoff since that has the fake offset: */
199         pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
200
201         page = pages[pgoff];
202
203         VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
204              page_to_pfn(page), page_to_pfn(page) << PAGE_SHIFT);
205
206         return vmf_insert_page(vma, vmf->address, page);
207 }
208
209 int etnaviv_gem_mmap_offset(struct drm_gem_object *obj, u64 *offset)
210 {
211         int ret;
212
213         /* Make it mmapable */
214         ret = drm_gem_create_mmap_offset(obj);
215         if (ret)
216                 dev_err(obj->dev->dev, "could not allocate mmap offset\n");
217         else
218                 *offset = drm_vma_node_offset_addr(&obj->vma_node);
219
220         return ret;
221 }
222
223 static struct etnaviv_vram_mapping *
224 etnaviv_gem_get_vram_mapping(struct etnaviv_gem_object *obj,
225                              struct etnaviv_iommu_context *context)
226 {
227         struct etnaviv_vram_mapping *mapping;
228
229         list_for_each_entry(mapping, &obj->vram_list, obj_node) {
230                 if (mapping->context == context)
231                         return mapping;
232         }
233
234         return NULL;
235 }
236
237 void etnaviv_gem_mapping_unreference(struct etnaviv_vram_mapping *mapping)
238 {
239         struct etnaviv_gem_object *etnaviv_obj = mapping->object;
240
241         mutex_lock(&etnaviv_obj->lock);
242         WARN_ON(mapping->use == 0);
243         mapping->use -= 1;
244         mutex_unlock(&etnaviv_obj->lock);
245
246         drm_gem_object_put(&etnaviv_obj->base);
247 }
248
249 struct etnaviv_vram_mapping *etnaviv_gem_mapping_get(
250         struct drm_gem_object *obj, struct etnaviv_iommu_context *mmu_context,
251         u64 va)
252 {
253         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
254         struct etnaviv_vram_mapping *mapping;
255         struct page **pages;
256         int ret = 0;
257
258         mutex_lock(&etnaviv_obj->lock);
259         mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, mmu_context);
260         if (mapping) {
261                 /*
262                  * Holding the object lock prevents the use count changing
263                  * beneath us.  If the use count is zero, the MMU might be
264                  * reaping this object, so take the lock and re-check that
265                  * the MMU owns this mapping to close this race.
266                  */
267                 if (mapping->use == 0) {
268                         mutex_lock(&mmu_context->lock);
269                         if (mapping->context == mmu_context)
270                                 mapping->use += 1;
271                         else
272                                 mapping = NULL;
273                         mutex_unlock(&mmu_context->lock);
274                         if (mapping)
275                                 goto out;
276                 } else {
277                         mapping->use += 1;
278                         goto out;
279                 }
280         }
281
282         pages = etnaviv_gem_get_pages(etnaviv_obj);
283         if (IS_ERR(pages)) {
284                 ret = PTR_ERR(pages);
285                 goto out;
286         }
287
288         /*
289          * See if we have a reaped vram mapping we can re-use before
290          * allocating a fresh mapping.
291          */
292         mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, NULL);
293         if (!mapping) {
294                 mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
295                 if (!mapping) {
296                         ret = -ENOMEM;
297                         goto out;
298                 }
299
300                 INIT_LIST_HEAD(&mapping->scan_node);
301                 mapping->object = etnaviv_obj;
302         } else {
303                 list_del(&mapping->obj_node);
304         }
305
306         etnaviv_iommu_context_get(mmu_context);
307         mapping->context = mmu_context;
308         mapping->use = 1;
309
310         ret = etnaviv_iommu_map_gem(mmu_context, etnaviv_obj,
311                                     mmu_context->global->memory_base,
312                                     mapping, va);
313         if (ret < 0) {
314                 etnaviv_iommu_context_put(mmu_context);
315                 kfree(mapping);
316         } else {
317                 list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list);
318         }
319
320 out:
321         mutex_unlock(&etnaviv_obj->lock);
322
323         if (ret)
324                 return ERR_PTR(ret);
325
326         /* Take a reference on the object */
327         drm_gem_object_get(obj);
328         return mapping;
329 }
330
331 void *etnaviv_gem_vmap(struct drm_gem_object *obj)
332 {
333         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
334
335         if (etnaviv_obj->vaddr)
336                 return etnaviv_obj->vaddr;
337
338         mutex_lock(&etnaviv_obj->lock);
339         /*
340          * Need to check again, as we might have raced with another thread
341          * while waiting for the mutex.
342          */
343         if (!etnaviv_obj->vaddr)
344                 etnaviv_obj->vaddr = etnaviv_obj->ops->vmap(etnaviv_obj);
345         mutex_unlock(&etnaviv_obj->lock);
346
347         return etnaviv_obj->vaddr;
348 }
349
350 static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj)
351 {
352         struct page **pages;
353
354         lockdep_assert_held(&obj->lock);
355
356         pages = etnaviv_gem_get_pages(obj);
357         if (IS_ERR(pages))
358                 return NULL;
359
360         return vmap(pages, obj->base.size >> PAGE_SHIFT,
361                         VM_MAP, pgprot_writecombine(PAGE_KERNEL));
362 }
363
364 static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op)
365 {
366         if (op & ETNA_PREP_READ)
367                 return DMA_FROM_DEVICE;
368         else if (op & ETNA_PREP_WRITE)
369                 return DMA_TO_DEVICE;
370         else
371                 return DMA_BIDIRECTIONAL;
372 }
373
374 int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op,
375                 struct drm_etnaviv_timespec *timeout)
376 {
377         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
378         struct drm_device *dev = obj->dev;
379         bool write = !!(op & ETNA_PREP_WRITE);
380         int ret;
381
382         if (!etnaviv_obj->sgt) {
383                 void *ret;
384
385                 mutex_lock(&etnaviv_obj->lock);
386                 ret = etnaviv_gem_get_pages(etnaviv_obj);
387                 mutex_unlock(&etnaviv_obj->lock);
388                 if (IS_ERR(ret))
389                         return PTR_ERR(ret);
390         }
391
392         if (op & ETNA_PREP_NOSYNC) {
393                 if (!dma_resv_test_signaled(obj->resv, write))
394                         return -EBUSY;
395         } else {
396                 unsigned long remain = etnaviv_timeout_to_jiffies(timeout);
397
398                 ret = dma_resv_wait_timeout(obj->resv, write, true, remain);
399                 if (ret <= 0)
400                         return ret == 0 ? -ETIMEDOUT : ret;
401         }
402
403         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
404                 dma_sync_sgtable_for_cpu(dev->dev, etnaviv_obj->sgt,
405                                          etnaviv_op_to_dma_dir(op));
406                 etnaviv_obj->last_cpu_prep_op = op;
407         }
408
409         return 0;
410 }
411
412 int etnaviv_gem_cpu_fini(struct drm_gem_object *obj)
413 {
414         struct drm_device *dev = obj->dev;
415         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
416
417         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
418                 /* fini without a prep is almost certainly a userspace error */
419                 WARN_ON(etnaviv_obj->last_cpu_prep_op == 0);
420                 dma_sync_sgtable_for_device(dev->dev, etnaviv_obj->sgt,
421                         etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op));
422                 etnaviv_obj->last_cpu_prep_op = 0;
423         }
424
425         return 0;
426 }
427
428 int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj,
429         struct drm_etnaviv_timespec *timeout)
430 {
431         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
432
433         return etnaviv_gpu_wait_obj_inactive(gpu, etnaviv_obj, timeout);
434 }
435
436 #ifdef CONFIG_DEBUG_FS
437 static void etnaviv_gem_describe_fence(struct dma_fence *fence,
438         const char *type, struct seq_file *m)
439 {
440         if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags))
441                 seq_printf(m, "\t%9s: %s %s seq %llu\n",
442                            type,
443                            fence->ops->get_driver_name(fence),
444                            fence->ops->get_timeline_name(fence),
445                            fence->seqno);
446 }
447
448 static void etnaviv_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
449 {
450         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
451         struct dma_resv *robj = obj->resv;
452         struct dma_resv_list *fobj;
453         struct dma_fence *fence;
454         unsigned long off = drm_vma_node_start(&obj->vma_node);
455
456         seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n",
457                         etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I',
458                         obj->name, kref_read(&obj->refcount),
459                         off, etnaviv_obj->vaddr, obj->size);
460
461         rcu_read_lock();
462         fobj = dma_resv_shared_list(robj);
463         if (fobj) {
464                 unsigned int i, shared_count = fobj->shared_count;
465
466                 for (i = 0; i < shared_count; i++) {
467                         fence = rcu_dereference(fobj->shared[i]);
468                         etnaviv_gem_describe_fence(fence, "Shared", m);
469                 }
470         }
471
472         fence = dma_resv_excl_fence(robj);
473         if (fence)
474                 etnaviv_gem_describe_fence(fence, "Exclusive", m);
475         rcu_read_unlock();
476 }
477
478 void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv,
479         struct seq_file *m)
480 {
481         struct etnaviv_gem_object *etnaviv_obj;
482         int count = 0;
483         size_t size = 0;
484
485         mutex_lock(&priv->gem_lock);
486         list_for_each_entry(etnaviv_obj, &priv->gem_list, gem_node) {
487                 struct drm_gem_object *obj = &etnaviv_obj->base;
488
489                 seq_puts(m, "   ");
490                 etnaviv_gem_describe(obj, m);
491                 count++;
492                 size += obj->size;
493         }
494         mutex_unlock(&priv->gem_lock);
495
496         seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
497 }
498 #endif
499
500 static void etnaviv_gem_shmem_release(struct etnaviv_gem_object *etnaviv_obj)
501 {
502         vunmap(etnaviv_obj->vaddr);
503         put_pages(etnaviv_obj);
504 }
505
506 static const struct etnaviv_gem_ops etnaviv_gem_shmem_ops = {
507         .get_pages = etnaviv_gem_shmem_get_pages,
508         .release = etnaviv_gem_shmem_release,
509         .vmap = etnaviv_gem_vmap_impl,
510         .mmap = etnaviv_gem_mmap_obj,
511 };
512
513 void etnaviv_gem_free_object(struct drm_gem_object *obj)
514 {
515         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
516         struct etnaviv_drm_private *priv = obj->dev->dev_private;
517         struct etnaviv_vram_mapping *mapping, *tmp;
518
519         /* object should not be active */
520         WARN_ON(is_active(etnaviv_obj));
521
522         mutex_lock(&priv->gem_lock);
523         list_del(&etnaviv_obj->gem_node);
524         mutex_unlock(&priv->gem_lock);
525
526         list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list,
527                                  obj_node) {
528                 struct etnaviv_iommu_context *context = mapping->context;
529
530                 WARN_ON(mapping->use);
531
532                 if (context) {
533                         etnaviv_iommu_unmap_gem(context, mapping);
534                         etnaviv_iommu_context_put(context);
535                 }
536
537                 list_del(&mapping->obj_node);
538                 kfree(mapping);
539         }
540
541         drm_gem_free_mmap_offset(obj);
542         etnaviv_obj->ops->release(etnaviv_obj);
543         drm_gem_object_release(obj);
544
545         kfree(etnaviv_obj);
546 }
547
548 void etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj)
549 {
550         struct etnaviv_drm_private *priv = dev->dev_private;
551         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
552
553         mutex_lock(&priv->gem_lock);
554         list_add_tail(&etnaviv_obj->gem_node, &priv->gem_list);
555         mutex_unlock(&priv->gem_lock);
556 }
557
558 static const struct vm_operations_struct vm_ops = {
559         .fault = etnaviv_gem_fault,
560         .open = drm_gem_vm_open,
561         .close = drm_gem_vm_close,
562 };
563
564 static const struct drm_gem_object_funcs etnaviv_gem_object_funcs = {
565         .free = etnaviv_gem_free_object,
566         .pin = etnaviv_gem_prime_pin,
567         .unpin = etnaviv_gem_prime_unpin,
568         .get_sg_table = etnaviv_gem_prime_get_sg_table,
569         .vmap = etnaviv_gem_prime_vmap,
570         .vm_ops = &vm_ops,
571 };
572
573 static int etnaviv_gem_new_impl(struct drm_device *dev, u32 size, u32 flags,
574         const struct etnaviv_gem_ops *ops, struct drm_gem_object **obj)
575 {
576         struct etnaviv_gem_object *etnaviv_obj;
577         unsigned sz = sizeof(*etnaviv_obj);
578         bool valid = true;
579
580         /* validate flags */
581         switch (flags & ETNA_BO_CACHE_MASK) {
582         case ETNA_BO_UNCACHED:
583         case ETNA_BO_CACHED:
584         case ETNA_BO_WC:
585                 break;
586         default:
587                 valid = false;
588         }
589
590         if (!valid) {
591                 dev_err(dev->dev, "invalid cache flag: %x\n",
592                         (flags & ETNA_BO_CACHE_MASK));
593                 return -EINVAL;
594         }
595
596         etnaviv_obj = kzalloc(sz, GFP_KERNEL);
597         if (!etnaviv_obj)
598                 return -ENOMEM;
599
600         etnaviv_obj->flags = flags;
601         etnaviv_obj->ops = ops;
602
603         mutex_init(&etnaviv_obj->lock);
604         INIT_LIST_HEAD(&etnaviv_obj->vram_list);
605
606         *obj = &etnaviv_obj->base;
607         (*obj)->funcs = &etnaviv_gem_object_funcs;
608
609         return 0;
610 }
611
612 /* convenience method to construct a GEM buffer object, and userspace handle */
613 int etnaviv_gem_new_handle(struct drm_device *dev, struct drm_file *file,
614         u32 size, u32 flags, u32 *handle)
615 {
616         struct etnaviv_drm_private *priv = dev->dev_private;
617         struct drm_gem_object *obj = NULL;
618         int ret;
619
620         size = PAGE_ALIGN(size);
621
622         ret = etnaviv_gem_new_impl(dev, size, flags,
623                                    &etnaviv_gem_shmem_ops, &obj);
624         if (ret)
625                 goto fail;
626
627         lockdep_set_class(&to_etnaviv_bo(obj)->lock, &etnaviv_shm_lock_class);
628
629         ret = drm_gem_object_init(dev, obj, size);
630         if (ret)
631                 goto fail;
632
633         /*
634          * Our buffers are kept pinned, so allocating them from the MOVABLE
635          * zone is a really bad idea, and conflicts with CMA. See comments
636          * above new_inode() why this is required _and_ expected if you're
637          * going to pin these pages.
638          */
639         mapping_set_gfp_mask(obj->filp->f_mapping, priv->shm_gfp_mask);
640
641         etnaviv_gem_obj_add(dev, obj);
642
643         ret = drm_gem_handle_create(file, obj, handle);
644
645         /* drop reference from allocate - handle holds it now */
646 fail:
647         drm_gem_object_put(obj);
648
649         return ret;
650 }
651
652 int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags,
653         const struct etnaviv_gem_ops *ops, struct etnaviv_gem_object **res)
654 {
655         struct drm_gem_object *obj;
656         int ret;
657
658         ret = etnaviv_gem_new_impl(dev, size, flags, ops, &obj);
659         if (ret)
660                 return ret;
661
662         drm_gem_private_object_init(dev, obj, size);
663
664         *res = to_etnaviv_bo(obj);
665
666         return 0;
667 }
668
669 static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj)
670 {
671         struct page **pvec = NULL;
672         struct etnaviv_gem_userptr *userptr = &etnaviv_obj->userptr;
673         int ret, pinned = 0, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
674
675         might_lock_read(&current->mm->mmap_lock);
676
677         if (userptr->mm != current->mm)
678                 return -EPERM;
679
680         pvec = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
681         if (!pvec)
682                 return -ENOMEM;
683
684         do {
685                 unsigned num_pages = npages - pinned;
686                 uint64_t ptr = userptr->ptr + pinned * PAGE_SIZE;
687                 struct page **pages = pvec + pinned;
688
689                 ret = pin_user_pages_fast(ptr, num_pages,
690                                           FOLL_WRITE | FOLL_FORCE | FOLL_LONGTERM,
691                                           pages);
692                 if (ret < 0) {
693                         unpin_user_pages(pvec, pinned);
694                         kvfree(pvec);
695                         return ret;
696                 }
697
698                 pinned += ret;
699
700         } while (pinned < npages);
701
702         etnaviv_obj->pages = pvec;
703
704         return 0;
705 }
706
707 static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj)
708 {
709         if (etnaviv_obj->sgt) {
710                 etnaviv_gem_scatterlist_unmap(etnaviv_obj);
711                 sg_free_table(etnaviv_obj->sgt);
712                 kfree(etnaviv_obj->sgt);
713         }
714         if (etnaviv_obj->pages) {
715                 int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
716
717                 unpin_user_pages(etnaviv_obj->pages, npages);
718                 kvfree(etnaviv_obj->pages);
719         }
720 }
721
722 static int etnaviv_gem_userptr_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
723                 struct vm_area_struct *vma)
724 {
725         return -EINVAL;
726 }
727
728 static const struct etnaviv_gem_ops etnaviv_gem_userptr_ops = {
729         .get_pages = etnaviv_gem_userptr_get_pages,
730         .release = etnaviv_gem_userptr_release,
731         .vmap = etnaviv_gem_vmap_impl,
732         .mmap = etnaviv_gem_userptr_mmap_obj,
733 };
734
735 int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file,
736         uintptr_t ptr, u32 size, u32 flags, u32 *handle)
737 {
738         struct etnaviv_gem_object *etnaviv_obj;
739         int ret;
740
741         ret = etnaviv_gem_new_private(dev, size, ETNA_BO_CACHED,
742                                       &etnaviv_gem_userptr_ops, &etnaviv_obj);
743         if (ret)
744                 return ret;
745
746         lockdep_set_class(&etnaviv_obj->lock, &etnaviv_userptr_lock_class);
747
748         etnaviv_obj->userptr.ptr = ptr;
749         etnaviv_obj->userptr.mm = current->mm;
750         etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE);
751
752         etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
753
754         ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle);
755
756         /* drop reference from allocate - handle holds it now */
757         drm_gem_object_put(&etnaviv_obj->base);
758         return ret;
759 }