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1/*
2 * Copyright (C) 2013 Red Hat
3 * Author: Rob Clark <robdclark@gmail.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18#include <linux/spinlock.h>
19#include <linux/shmem_fs.h>
20#include <linux/dma-buf.h>
21#include <linux/pfn_t.h>
22
23#include "msm_drv.h"
24#include "msm_fence.h"
25#include "msm_gem.h"
26#include "msm_gpu.h"
27#include "msm_mmu.h"
28
29static dma_addr_t physaddr(struct drm_gem_object *obj)
30{
31 struct msm_gem_object *msm_obj = to_msm_bo(obj);
32 struct msm_drm_private *priv = obj->dev->dev_private;
33 return (((dma_addr_t)msm_obj->vram_node->start) << PAGE_SHIFT) +
34 priv->vram.paddr;
35}
36
37static bool use_pages(struct drm_gem_object *obj)
38{
39 struct msm_gem_object *msm_obj = to_msm_bo(obj);
40 return !msm_obj->vram_node;
41}
42
43/* allocate pages from VRAM carveout, used when no IOMMU: */
44static struct page **get_pages_vram(struct drm_gem_object *obj,
45 int npages)
46{
47 struct msm_gem_object *msm_obj = to_msm_bo(obj);
48 struct msm_drm_private *priv = obj->dev->dev_private;
49 dma_addr_t paddr;
50 struct page **p;
51 int ret, i;
52
53 p = drm_malloc_ab(npages, sizeof(struct page *));
54 if (!p)
55 return ERR_PTR(-ENOMEM);
56
57 ret = drm_mm_insert_node(&priv->vram.mm, msm_obj->vram_node,
58 npages, 0, DRM_MM_SEARCH_DEFAULT);
59 if (ret) {
60 drm_free_large(p);
61 return ERR_PTR(ret);
62 }
63
64 paddr = physaddr(obj);
65 for (i = 0; i < npages; i++) {
66 p[i] = phys_to_page(paddr);
67 paddr += PAGE_SIZE;
68 }
69
70 return p;
71}
72
73/* called with dev->struct_mutex held */
74static struct page **get_pages(struct drm_gem_object *obj)
75{
76 struct msm_gem_object *msm_obj = to_msm_bo(obj);
77
78 if (!msm_obj->pages) {
79 struct drm_device *dev = obj->dev;
80 struct page **p;
81 int npages = obj->size >> PAGE_SHIFT;
82
83 if (use_pages(obj))
84 p = drm_gem_get_pages(obj);
85 else
86 p = get_pages_vram(obj, npages);
87
88 if (IS_ERR(p)) {
89 dev_err(dev->dev, "could not get pages: %ld\n",
90 PTR_ERR(p));
91 return p;
92 }
93
94 msm_obj->sgt = drm_prime_pages_to_sg(p, npages);
95 if (IS_ERR(msm_obj->sgt)) {
96 dev_err(dev->dev, "failed to allocate sgt\n");
97 return ERR_CAST(msm_obj->sgt);
98 }
99
100 msm_obj->pages = p;
101
102 /* For non-cached buffers, ensure the new pages are clean
103 * because display controller, GPU, etc. are not coherent:
104 */
105 if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
106 dma_map_sg(dev->dev, msm_obj->sgt->sgl,
107 msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
108 }
109
110 return msm_obj->pages;
111}
112
113static void put_pages(struct drm_gem_object *obj)
114{
115 struct msm_gem_object *msm_obj = to_msm_bo(obj);
116
117 if (msm_obj->pages) {
118 /* For non-cached buffers, ensure the new pages are clean
119 * because display controller, GPU, etc. are not coherent:
120 */
121 if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
122 dma_unmap_sg(obj->dev->dev, msm_obj->sgt->sgl,
123 msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
124 sg_free_table(msm_obj->sgt);
125 kfree(msm_obj->sgt);
126
127 if (use_pages(obj))
128 drm_gem_put_pages(obj, msm_obj->pages, true, false);
129 else {
130 drm_mm_remove_node(msm_obj->vram_node);
131 drm_free_large(msm_obj->pages);
132 }
133
134 msm_obj->pages = NULL;
135 }
136}
137
138struct page **msm_gem_get_pages(struct drm_gem_object *obj)
139{
140 struct drm_device *dev = obj->dev;
141 struct page **p;
142 mutex_lock(&dev->struct_mutex);
143 p = get_pages(obj);
144 mutex_unlock(&dev->struct_mutex);
145 return p;
146}
147
148void msm_gem_put_pages(struct drm_gem_object *obj)
149{
150 /* when we start tracking the pin count, then do something here */
151}
152
153int msm_gem_mmap_obj(struct drm_gem_object *obj,
154 struct vm_area_struct *vma)
155{
156 struct msm_gem_object *msm_obj = to_msm_bo(obj);
157
158 vma->vm_flags &= ~VM_PFNMAP;
159 vma->vm_flags |= VM_MIXEDMAP;
160
161 if (msm_obj->flags & MSM_BO_WC) {
162 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
163 } else if (msm_obj->flags & MSM_BO_UNCACHED) {
164 vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
165 } else {
166 /*
167 * Shunt off cached objs to shmem file so they have their own
168 * address_space (so unmap_mapping_range does what we want,
169 * in particular in the case of mmap'd dmabufs)
170 */
171 fput(vma->vm_file);
172 get_file(obj->filp);
173 vma->vm_pgoff = 0;
174 vma->vm_file = obj->filp;
175
176 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
177 }
178
179 return 0;
180}
181
182int msm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
183{
184 int ret;
185
186 ret = drm_gem_mmap(filp, vma);
187 if (ret) {
188 DBG("mmap failed: %d", ret);
189 return ret;
190 }
191
192 return msm_gem_mmap_obj(vma->vm_private_data, vma);
193}
194
195int msm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
196{
197 struct drm_gem_object *obj = vma->vm_private_data;
198 struct drm_device *dev = obj->dev;
199 struct msm_drm_private *priv = dev->dev_private;
200 struct page **pages;
201 unsigned long pfn;
202 pgoff_t pgoff;
203 int ret;
204
205 /* This should only happen if userspace tries to pass a mmap'd
206 * but unfaulted gem bo vaddr into submit ioctl, triggering
207 * a page fault while struct_mutex is already held. This is
208 * not a valid use-case so just bail.
209 */
210 if (priv->struct_mutex_task == current)
211 return VM_FAULT_SIGBUS;
212
213 /* Make sure we don't parallel update on a fault, nor move or remove
214 * something from beneath our feet
215 */
216 ret = mutex_lock_interruptible(&dev->struct_mutex);
217 if (ret)
218 goto out;
219
220 /* make sure we have pages attached now */
221 pages = get_pages(obj);
222 if (IS_ERR(pages)) {
223 ret = PTR_ERR(pages);
224 goto out_unlock;
225 }
226
227 /* We don't use vmf->pgoff since that has the fake offset: */
228 pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
229
230 pfn = page_to_pfn(pages[pgoff]);
231
232 VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
233 pfn, pfn << PAGE_SHIFT);
234
235 ret = vm_insert_mixed(vma, vmf->address, __pfn_to_pfn_t(pfn, PFN_DEV));
236
237out_unlock:
238 mutex_unlock(&dev->struct_mutex);
239out:
240 switch (ret) {
241 case -EAGAIN:
242 case 0:
243 case -ERESTARTSYS:
244 case -EINTR:
245 case -EBUSY:
246 /*
247 * EBUSY is ok: this just means that another thread
248 * already did the job.
249 */
250 return VM_FAULT_NOPAGE;
251 case -ENOMEM:
252 return VM_FAULT_OOM;
253 default:
254 return VM_FAULT_SIGBUS;
255 }
256}
257
258/** get mmap offset */
259static uint64_t mmap_offset(struct drm_gem_object *obj)
260{
261 struct drm_device *dev = obj->dev;
262 int ret;
263
264 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
265
266 /* Make it mmapable */
267 ret = drm_gem_create_mmap_offset(obj);
268
269 if (ret) {
270 dev_err(dev->dev, "could not allocate mmap offset\n");
271 return 0;
272 }
273
274 return drm_vma_node_offset_addr(&obj->vma_node);
275}
276
277uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj)
278{
279 uint64_t offset;
280 mutex_lock(&obj->dev->struct_mutex);
281 offset = mmap_offset(obj);
282 mutex_unlock(&obj->dev->struct_mutex);
283 return offset;
284}
285
286static void
287put_iova(struct drm_gem_object *obj)
288{
289 struct drm_device *dev = obj->dev;
290 struct msm_drm_private *priv = obj->dev->dev_private;
291 struct msm_gem_object *msm_obj = to_msm_bo(obj);
292 int id;
293
294 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
295
296 for (id = 0; id < ARRAY_SIZE(msm_obj->domain); id++) {
297 if (!priv->aspace[id])
298 continue;
299 msm_gem_unmap_vma(priv->aspace[id],
300 &msm_obj->domain[id], msm_obj->sgt);
301 }
302}
303
304/* should be called under struct_mutex.. although it can be called
305 * from atomic context without struct_mutex to acquire an extra
306 * iova ref if you know one is already held.
307 *
308 * That means when I do eventually need to add support for unpinning
309 * the refcnt counter needs to be atomic_t.
310 */
311int msm_gem_get_iova_locked(struct drm_gem_object *obj, int id,
312 uint64_t *iova)
313{
314 struct msm_gem_object *msm_obj = to_msm_bo(obj);
315 int ret = 0;
316
317 if (!msm_obj->domain[id].iova) {
318 struct msm_drm_private *priv = obj->dev->dev_private;
319 struct page **pages = get_pages(obj);
320
321 if (IS_ERR(pages))
322 return PTR_ERR(pages);
323
324 if (iommu_present(&platform_bus_type)) {
325 ret = msm_gem_map_vma(priv->aspace[id], &msm_obj->domain[id],
326 msm_obj->sgt, obj->size >> PAGE_SHIFT);
327 } else {
328 msm_obj->domain[id].iova = physaddr(obj);
329 }
330 }
331
332 if (!ret)
333 *iova = msm_obj->domain[id].iova;
334
335 return ret;
336}
337
338/* get iova, taking a reference. Should have a matching put */
339int msm_gem_get_iova(struct drm_gem_object *obj, int id, uint64_t *iova)
340{
341 struct msm_gem_object *msm_obj = to_msm_bo(obj);
342 int ret;
343
344 /* this is safe right now because we don't unmap until the
345 * bo is deleted:
346 */
347 if (msm_obj->domain[id].iova) {
348 *iova = msm_obj->domain[id].iova;
349 return 0;
350 }
351
352 mutex_lock(&obj->dev->struct_mutex);
353 ret = msm_gem_get_iova_locked(obj, id, iova);
354 mutex_unlock(&obj->dev->struct_mutex);
355 return ret;
356}
357
358/* get iova without taking a reference, used in places where you have
359 * already done a 'msm_gem_get_iova()'.
360 */
361uint64_t msm_gem_iova(struct drm_gem_object *obj, int id)
362{
363 struct msm_gem_object *msm_obj = to_msm_bo(obj);
364 WARN_ON(!msm_obj->domain[id].iova);
365 return msm_obj->domain[id].iova;
366}
367
368void msm_gem_put_iova(struct drm_gem_object *obj, int id)
369{
370 // XXX TODO ..
371 // NOTE: probably don't need a _locked() version.. we wouldn't
372 // normally unmap here, but instead just mark that it could be
373 // unmapped (if the iova refcnt drops to zero), but then later
374 // if another _get_iova_locked() fails we can start unmapping
375 // things that are no longer needed..
376}
377
378int msm_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
379 struct drm_mode_create_dumb *args)
380{
381 args->pitch = align_pitch(args->width, args->bpp);
382 args->size = PAGE_ALIGN(args->pitch * args->height);
383 return msm_gem_new_handle(dev, file, args->size,
384 MSM_BO_SCANOUT | MSM_BO_WC, &args->handle);
385}
386
387int msm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
388 uint32_t handle, uint64_t *offset)
389{
390 struct drm_gem_object *obj;
391 int ret = 0;
392
393 /* GEM does all our handle to object mapping */
394 obj = drm_gem_object_lookup(file, handle);
395 if (obj == NULL) {
396 ret = -ENOENT;
397 goto fail;
398 }
399
400 *offset = msm_gem_mmap_offset(obj);
401
402 drm_gem_object_unreference_unlocked(obj);
403
404fail:
405 return ret;
406}
407
408void *msm_gem_get_vaddr_locked(struct drm_gem_object *obj)
409{
410 struct msm_gem_object *msm_obj = to_msm_bo(obj);
411 WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
412 if (!msm_obj->vaddr) {
413 struct page **pages = get_pages(obj);
414 if (IS_ERR(pages))
415 return ERR_CAST(pages);
416 msm_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT,
417 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
418 if (msm_obj->vaddr == NULL)
419 return ERR_PTR(-ENOMEM);
420 }
421 msm_obj->vmap_count++;
422 return msm_obj->vaddr;
423}
424
425void *msm_gem_get_vaddr(struct drm_gem_object *obj)
426{
427 void *ret;
428 mutex_lock(&obj->dev->struct_mutex);
429 ret = msm_gem_get_vaddr_locked(obj);
430 mutex_unlock(&obj->dev->struct_mutex);
431 return ret;
432}
433
434void msm_gem_put_vaddr_locked(struct drm_gem_object *obj)
435{
436 struct msm_gem_object *msm_obj = to_msm_bo(obj);
437 WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
438 WARN_ON(msm_obj->vmap_count < 1);
439 msm_obj->vmap_count--;
440}
441
442void msm_gem_put_vaddr(struct drm_gem_object *obj)
443{
444 mutex_lock(&obj->dev->struct_mutex);
445 msm_gem_put_vaddr_locked(obj);
446 mutex_unlock(&obj->dev->struct_mutex);
447}
448
449/* Update madvise status, returns true if not purged, else
450 * false or -errno.
451 */
452int msm_gem_madvise(struct drm_gem_object *obj, unsigned madv)
453{
454 struct msm_gem_object *msm_obj = to_msm_bo(obj);
455
456 WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
457
458 if (msm_obj->madv != __MSM_MADV_PURGED)
459 msm_obj->madv = madv;
460
461 return (msm_obj->madv != __MSM_MADV_PURGED);
462}
463
464void msm_gem_purge(struct drm_gem_object *obj)
465{
466 struct drm_device *dev = obj->dev;
467 struct msm_gem_object *msm_obj = to_msm_bo(obj);
468
469 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
470 WARN_ON(!is_purgeable(msm_obj));
471 WARN_ON(obj->import_attach);
472
473 put_iova(obj);
474
475 msm_gem_vunmap(obj);
476
477 put_pages(obj);
478
479 msm_obj->madv = __MSM_MADV_PURGED;
480
481 drm_vma_node_unmap(&obj->vma_node, dev->anon_inode->i_mapping);
482 drm_gem_free_mmap_offset(obj);
483
484 /* Our goal here is to return as much of the memory as
485 * is possible back to the system as we are called from OOM.
486 * To do this we must instruct the shmfs to drop all of its
487 * backing pages, *now*.
488 */
489 shmem_truncate_range(file_inode(obj->filp), 0, (loff_t)-1);
490
491 invalidate_mapping_pages(file_inode(obj->filp)->i_mapping,
492 0, (loff_t)-1);
493}
494
495void msm_gem_vunmap(struct drm_gem_object *obj)
496{
497 struct msm_gem_object *msm_obj = to_msm_bo(obj);
498
499 if (!msm_obj->vaddr || WARN_ON(!is_vunmapable(msm_obj)))
500 return;
501
502 vunmap(msm_obj->vaddr);
503 msm_obj->vaddr = NULL;
504}
505
506/* must be called before _move_to_active().. */
507int msm_gem_sync_object(struct drm_gem_object *obj,
508 struct msm_fence_context *fctx, bool exclusive)
509{
510 struct msm_gem_object *msm_obj = to_msm_bo(obj);
511 struct reservation_object_list *fobj;
512 struct dma_fence *fence;
513 int i, ret;
514
515 if (!exclusive) {
516 /* NOTE: _reserve_shared() must happen before _add_shared_fence(),
517 * which makes this a slightly strange place to call it. OTOH this
518 * is a convenient can-fail point to hook it in. (And similar to
519 * how etnaviv and nouveau handle this.)
520 */
521 ret = reservation_object_reserve_shared(msm_obj->resv);
522 if (ret)
523 return ret;
524 }
525
526 fobj = reservation_object_get_list(msm_obj->resv);
527 if (!fobj || (fobj->shared_count == 0)) {
528 fence = reservation_object_get_excl(msm_obj->resv);
529 /* don't need to wait on our own fences, since ring is fifo */
530 if (fence && (fence->context != fctx->context)) {
531 ret = dma_fence_wait(fence, true);
532 if (ret)
533 return ret;
534 }
535 }
536
537 if (!exclusive || !fobj)
538 return 0;
539
540 for (i = 0; i < fobj->shared_count; i++) {
541 fence = rcu_dereference_protected(fobj->shared[i],
542 reservation_object_held(msm_obj->resv));
543 if (fence->context != fctx->context) {
544 ret = dma_fence_wait(fence, true);
545 if (ret)
546 return ret;
547 }
548 }
549
550 return 0;
551}
552
553void msm_gem_move_to_active(struct drm_gem_object *obj,
554 struct msm_gpu *gpu, bool exclusive, struct dma_fence *fence)
555{
556 struct msm_gem_object *msm_obj = to_msm_bo(obj);
557 WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED);
558 msm_obj->gpu = gpu;
559 if (exclusive)
560 reservation_object_add_excl_fence(msm_obj->resv, fence);
561 else
562 reservation_object_add_shared_fence(msm_obj->resv, fence);
563 list_del_init(&msm_obj->mm_list);
564 list_add_tail(&msm_obj->mm_list, &gpu->active_list);
565}
566
567void msm_gem_move_to_inactive(struct drm_gem_object *obj)
568{
569 struct drm_device *dev = obj->dev;
570 struct msm_drm_private *priv = dev->dev_private;
571 struct msm_gem_object *msm_obj = to_msm_bo(obj);
572
573 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
574
575 msm_obj->gpu = NULL;
576 list_del_init(&msm_obj->mm_list);
577 list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
578}
579
580int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op, ktime_t *timeout)
581{
582 struct msm_gem_object *msm_obj = to_msm_bo(obj);
583 bool write = !!(op & MSM_PREP_WRITE);
584 unsigned long remain =
585 op & MSM_PREP_NOSYNC ? 0 : timeout_to_jiffies(timeout);
586 long ret;
587
588 ret = reservation_object_wait_timeout_rcu(msm_obj->resv, write,
589 true, remain);
590 if (ret == 0)
591 return remain == 0 ? -EBUSY : -ETIMEDOUT;
592 else if (ret < 0)
593 return ret;
594
595 /* TODO cache maintenance */
596
597 return 0;
598}
599
600int msm_gem_cpu_fini(struct drm_gem_object *obj)
601{
602 /* TODO cache maintenance */
603 return 0;
604}
605
606#ifdef CONFIG_DEBUG_FS
607static void describe_fence(struct dma_fence *fence, const char *type,
608 struct seq_file *m)
609{
610 if (!dma_fence_is_signaled(fence))
611 seq_printf(m, "\t%9s: %s %s seq %u\n", type,
612 fence->ops->get_driver_name(fence),
613 fence->ops->get_timeline_name(fence),
614 fence->seqno);
615}
616
617void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
618{
619 struct msm_gem_object *msm_obj = to_msm_bo(obj);
620 struct reservation_object *robj = msm_obj->resv;
621 struct reservation_object_list *fobj;
622 struct msm_drm_private *priv = obj->dev->dev_private;
623 struct dma_fence *fence;
624 uint64_t off = drm_vma_node_start(&obj->vma_node);
625 const char *madv;
626 unsigned id;
627
628 WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
629
630 switch (msm_obj->madv) {
631 case __MSM_MADV_PURGED:
632 madv = " purged";
633 break;
634 case MSM_MADV_DONTNEED:
635 madv = " purgeable";
636 break;
637 case MSM_MADV_WILLNEED:
638 default:
639 madv = "";
640 break;
641 }
642
643 seq_printf(m, "%08x: %c %2d (%2d) %08llx %p\t",
644 msm_obj->flags, is_active(msm_obj) ? 'A' : 'I',
645 obj->name, obj->refcount.refcount.counter,
646 off, msm_obj->vaddr);
647
648 for (id = 0; id < priv->num_aspaces; id++)
649 seq_printf(m, " %08llx", msm_obj->domain[id].iova);
650
651 seq_printf(m, " %zu%s\n", obj->size, madv);
652
653 rcu_read_lock();
654 fobj = rcu_dereference(robj->fence);
655 if (fobj) {
656 unsigned int i, shared_count = fobj->shared_count;
657
658 for (i = 0; i < shared_count; i++) {
659 fence = rcu_dereference(fobj->shared[i]);
660 describe_fence(fence, "Shared", m);
661 }
662 }
663
664 fence = rcu_dereference(robj->fence_excl);
665 if (fence)
666 describe_fence(fence, "Exclusive", m);
667 rcu_read_unlock();
668}
669
670void msm_gem_describe_objects(struct list_head *list, struct seq_file *m)
671{
672 struct msm_gem_object *msm_obj;
673 int count = 0;
674 size_t size = 0;
675
676 list_for_each_entry(msm_obj, list, mm_list) {
677 struct drm_gem_object *obj = &msm_obj->base;
678 seq_printf(m, " ");
679 msm_gem_describe(obj, m);
680 count++;
681 size += obj->size;
682 }
683
684 seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
685}
686#endif
687
688void msm_gem_free_object(struct drm_gem_object *obj)
689{
690 struct drm_device *dev = obj->dev;
691 struct msm_gem_object *msm_obj = to_msm_bo(obj);
692
693 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
694
695 /* object should not be on active list: */
696 WARN_ON(is_active(msm_obj));
697
698 list_del(&msm_obj->mm_list);
699
700 put_iova(obj);
701
702 if (obj->import_attach) {
703 if (msm_obj->vaddr)
704 dma_buf_vunmap(obj->import_attach->dmabuf, msm_obj->vaddr);
705
706 /* Don't drop the pages for imported dmabuf, as they are not
707 * ours, just free the array we allocated:
708 */
709 if (msm_obj->pages)
710 drm_free_large(msm_obj->pages);
711
712 drm_prime_gem_destroy(obj, msm_obj->sgt);
713 } else {
714 msm_gem_vunmap(obj);
715 put_pages(obj);
716 }
717
718 if (msm_obj->resv == &msm_obj->_resv)
719 reservation_object_fini(msm_obj->resv);
720
721 drm_gem_object_release(obj);
722
723 kfree(msm_obj);
724}
725
726/* convenience method to construct a GEM buffer object, and userspace handle */
727int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
728 uint32_t size, uint32_t flags, uint32_t *handle)
729{
730 struct drm_gem_object *obj;
731 int ret;
732
733 ret = mutex_lock_interruptible(&dev->struct_mutex);
734 if (ret)
735 return ret;
736
737 obj = msm_gem_new(dev, size, flags);
738
739 mutex_unlock(&dev->struct_mutex);
740
741 if (IS_ERR(obj))
742 return PTR_ERR(obj);
743
744 ret = drm_gem_handle_create(file, obj, handle);
745
746 /* drop reference from allocate - handle holds it now */
747 drm_gem_object_unreference_unlocked(obj);
748
749 return ret;
750}
751
752static int msm_gem_new_impl(struct drm_device *dev,
753 uint32_t size, uint32_t flags,
754 struct reservation_object *resv,
755 struct drm_gem_object **obj)
756{
757 struct msm_drm_private *priv = dev->dev_private;
758 struct msm_gem_object *msm_obj;
759 bool use_vram = false;
760
761 switch (flags & MSM_BO_CACHE_MASK) {
762 case MSM_BO_UNCACHED:
763 case MSM_BO_CACHED:
764 case MSM_BO_WC:
765 break;
766 default:
767 dev_err(dev->dev, "invalid cache flag: %x\n",
768 (flags & MSM_BO_CACHE_MASK));
769 return -EINVAL;
770 }
771
772 if (!iommu_present(&platform_bus_type))
773 use_vram = true;
774 else if ((flags & MSM_BO_STOLEN) && priv->vram.size)
775 use_vram = true;
776
777 if (WARN_ON(use_vram && !priv->vram.size))
778 return -EINVAL;
779
780 msm_obj = kzalloc(sizeof(*msm_obj), GFP_KERNEL);
781 if (!msm_obj)
782 return -ENOMEM;
783
784 if (use_vram)
785 msm_obj->vram_node = &msm_obj->domain[0].node;
786
787 msm_obj->flags = flags;
788 msm_obj->madv = MSM_MADV_WILLNEED;
789
790 if (resv) {
791 msm_obj->resv = resv;
792 } else {
793 msm_obj->resv = &msm_obj->_resv;
794 reservation_object_init(msm_obj->resv);
795 }
796
797 INIT_LIST_HEAD(&msm_obj->submit_entry);
798 list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
799
800 *obj = &msm_obj->base;
801
802 return 0;
803}
804
805struct drm_gem_object *msm_gem_new(struct drm_device *dev,
806 uint32_t size, uint32_t flags)
807{
808 struct drm_gem_object *obj = NULL;
809 int ret;
810
811 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
812
813 size = PAGE_ALIGN(size);
814
815 ret = msm_gem_new_impl(dev, size, flags, NULL, &obj);
816 if (ret)
817 goto fail;
818
819 if (use_pages(obj)) {
820 ret = drm_gem_object_init(dev, obj, size);
821 if (ret)
822 goto fail;
823 } else {
824 drm_gem_private_object_init(dev, obj, size);
825 }
826
827 return obj;
828
829fail:
830 drm_gem_object_unreference(obj);
831 return ERR_PTR(ret);
832}
833
834struct drm_gem_object *msm_gem_import(struct drm_device *dev,
835 struct dma_buf *dmabuf, struct sg_table *sgt)
836{
837 struct msm_gem_object *msm_obj;
838 struct drm_gem_object *obj;
839 uint32_t size;
840 int ret, npages;
841
842 /* if we don't have IOMMU, don't bother pretending we can import: */
843 if (!iommu_present(&platform_bus_type)) {
844 dev_err(dev->dev, "cannot import without IOMMU\n");
845 return ERR_PTR(-EINVAL);
846 }
847
848 size = PAGE_ALIGN(dmabuf->size);
849
850 ret = msm_gem_new_impl(dev, size, MSM_BO_WC, dmabuf->resv, &obj);
851 if (ret)
852 goto fail;
853
854 drm_gem_private_object_init(dev, obj, size);
855
856 npages = size / PAGE_SIZE;
857
858 msm_obj = to_msm_bo(obj);
859 msm_obj->sgt = sgt;
860 msm_obj->pages = drm_malloc_ab(npages, sizeof(struct page *));
861 if (!msm_obj->pages) {
862 ret = -ENOMEM;
863 goto fail;
864 }
865
866 ret = drm_prime_sg_to_page_addr_arrays(sgt, msm_obj->pages, NULL, npages);
867 if (ret)
868 goto fail;
869
870 return obj;
871
872fail:
873 drm_gem_object_unreference_unlocked(obj);
874 return ERR_PTR(ret);
875}