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1/* exynos_drm_gem.c
2 *
3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * Author: Inki Dae <inki.dae@samsung.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 */
11
12#include <drm/drmP.h>
13#include <drm/drm_vma_manager.h>
14
15#include <linux/shmem_fs.h>
16#include <drm/exynos_drm.h>
17
18#include "exynos_drm_drv.h"
19#include "exynos_drm_gem.h"
20#include "exynos_drm_buf.h"
21#include "exynos_drm_iommu.h"
22
23static unsigned int convert_to_vm_err_msg(int msg)
24{
25 unsigned int out_msg;
26
27 switch (msg) {
28 case 0:
29 case -ERESTARTSYS:
30 case -EINTR:
31 out_msg = VM_FAULT_NOPAGE;
32 break;
33
34 case -ENOMEM:
35 out_msg = VM_FAULT_OOM;
36 break;
37
38 default:
39 out_msg = VM_FAULT_SIGBUS;
40 break;
41 }
42
43 return out_msg;
44}
45
46static int check_gem_flags(unsigned int flags)
47{
48 if (flags & ~(EXYNOS_BO_MASK)) {
49 DRM_ERROR("invalid flags.\n");
50 return -EINVAL;
51 }
52
53 return 0;
54}
55
56static void update_vm_cache_attr(struct exynos_drm_gem_obj *obj,
57 struct vm_area_struct *vma)
58{
59 DRM_DEBUG_KMS("flags = 0x%x\n", obj->flags);
60
61 /* non-cachable as default. */
62 if (obj->flags & EXYNOS_BO_CACHABLE)
63 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
64 else if (obj->flags & EXYNOS_BO_WC)
65 vma->vm_page_prot =
66 pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
67 else
68 vma->vm_page_prot =
69 pgprot_noncached(vm_get_page_prot(vma->vm_flags));
70}
71
72static unsigned long roundup_gem_size(unsigned long size, unsigned int flags)
73{
74 /* TODO */
75
76 return roundup(size, PAGE_SIZE);
77}
78
79static int exynos_drm_gem_map_buf(struct drm_gem_object *obj,
80 struct vm_area_struct *vma,
81 unsigned long f_vaddr,
82 pgoff_t page_offset)
83{
84 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
85 struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
86 struct scatterlist *sgl;
87 unsigned long pfn;
88 int i;
89
90 if (!buf->sgt)
91 return -EINTR;
92
93 if (page_offset >= (buf->size >> PAGE_SHIFT)) {
94 DRM_ERROR("invalid page offset\n");
95 return -EINVAL;
96 }
97
98 sgl = buf->sgt->sgl;
99 for_each_sg(buf->sgt->sgl, sgl, buf->sgt->nents, i) {
100 if (page_offset < (sgl->length >> PAGE_SHIFT))
101 break;
102 page_offset -= (sgl->length >> PAGE_SHIFT);
103 }
104
105 pfn = __phys_to_pfn(sg_phys(sgl)) + page_offset;
106
107 return vm_insert_mixed(vma, f_vaddr, pfn);
108}
109
110static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
111 struct drm_file *file_priv,
112 unsigned int *handle)
113{
114 int ret;
115
116 /*
117 * allocate a id of idr table where the obj is registered
118 * and handle has the id what user can see.
119 */
120 ret = drm_gem_handle_create(file_priv, obj, handle);
121 if (ret)
122 return ret;
123
124 DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
125
126 /* drop reference from allocate - handle holds it now. */
127 drm_gem_object_unreference_unlocked(obj);
128
129 return 0;
130}
131
132void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj)
133{
134 struct drm_gem_object *obj;
135 struct exynos_drm_gem_buf *buf;
136
137 obj = &exynos_gem_obj->base;
138 buf = exynos_gem_obj->buffer;
139
140 DRM_DEBUG_KMS("handle count = %d\n", obj->handle_count);
141
142 /*
143 * do not release memory region from exporter.
144 *
145 * the region will be released by exporter
146 * once dmabuf's refcount becomes 0.
147 */
148 if (obj->import_attach)
149 goto out;
150
151 exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf);
152
153out:
154 exynos_drm_fini_buf(obj->dev, buf);
155 exynos_gem_obj->buffer = NULL;
156
157 drm_gem_free_mmap_offset(obj);
158
159 /* release file pointer to gem object. */
160 drm_gem_object_release(obj);
161
162 kfree(exynos_gem_obj);
163 exynos_gem_obj = NULL;
164}
165
166unsigned long exynos_drm_gem_get_size(struct drm_device *dev,
167 unsigned int gem_handle,
168 struct drm_file *file_priv)
169{
170 struct exynos_drm_gem_obj *exynos_gem_obj;
171 struct drm_gem_object *obj;
172
173 obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
174 if (!obj) {
175 DRM_ERROR("failed to lookup gem object.\n");
176 return 0;
177 }
178
179 exynos_gem_obj = to_exynos_gem_obj(obj);
180
181 drm_gem_object_unreference_unlocked(obj);
182
183 return exynos_gem_obj->buffer->size;
184}
185
186
187struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
188 unsigned long size)
189{
190 struct exynos_drm_gem_obj *exynos_gem_obj;
191 struct drm_gem_object *obj;
192 int ret;
193
194 exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
195 if (!exynos_gem_obj)
196 return NULL;
197
198 exynos_gem_obj->size = size;
199 obj = &exynos_gem_obj->base;
200
201 ret = drm_gem_object_init(dev, obj, size);
202 if (ret < 0) {
203 DRM_ERROR("failed to initialize gem object\n");
204 kfree(exynos_gem_obj);
205 return NULL;
206 }
207
208 DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
209
210 return exynos_gem_obj;
211}
212
213struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
214 unsigned int flags,
215 unsigned long size)
216{
217 struct exynos_drm_gem_obj *exynos_gem_obj;
218 struct exynos_drm_gem_buf *buf;
219 int ret;
220
221 if (!size) {
222 DRM_ERROR("invalid size.\n");
223 return ERR_PTR(-EINVAL);
224 }
225
226 size = roundup_gem_size(size, flags);
227
228 ret = check_gem_flags(flags);
229 if (ret)
230 return ERR_PTR(ret);
231
232 buf = exynos_drm_init_buf(dev, size);
233 if (!buf)
234 return ERR_PTR(-ENOMEM);
235
236 exynos_gem_obj = exynos_drm_gem_init(dev, size);
237 if (!exynos_gem_obj) {
238 ret = -ENOMEM;
239 goto err_fini_buf;
240 }
241
242 exynos_gem_obj->buffer = buf;
243
244 /* set memory type and cache attribute from user side. */
245 exynos_gem_obj->flags = flags;
246
247 ret = exynos_drm_alloc_buf(dev, buf, flags);
248 if (ret < 0)
249 goto err_gem_fini;
250
251 return exynos_gem_obj;
252
253err_gem_fini:
254 drm_gem_object_release(&exynos_gem_obj->base);
255 kfree(exynos_gem_obj);
256err_fini_buf:
257 exynos_drm_fini_buf(dev, buf);
258 return ERR_PTR(ret);
259}
260
261int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
262 struct drm_file *file_priv)
263{
264 struct drm_exynos_gem_create *args = data;
265 struct exynos_drm_gem_obj *exynos_gem_obj;
266 int ret;
267
268 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
269 if (IS_ERR(exynos_gem_obj))
270 return PTR_ERR(exynos_gem_obj);
271
272 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
273 &args->handle);
274 if (ret) {
275 exynos_drm_gem_destroy(exynos_gem_obj);
276 return ret;
277 }
278
279 return 0;
280}
281
282dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
283 unsigned int gem_handle,
284 struct drm_file *filp)
285{
286 struct exynos_drm_gem_obj *exynos_gem_obj;
287 struct drm_gem_object *obj;
288
289 obj = drm_gem_object_lookup(dev, filp, gem_handle);
290 if (!obj) {
291 DRM_ERROR("failed to lookup gem object.\n");
292 return ERR_PTR(-EINVAL);
293 }
294
295 exynos_gem_obj = to_exynos_gem_obj(obj);
296
297 return &exynos_gem_obj->buffer->dma_addr;
298}
299
300void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
301 unsigned int gem_handle,
302 struct drm_file *filp)
303{
304 struct exynos_drm_gem_obj *exynos_gem_obj;
305 struct drm_gem_object *obj;
306
307 obj = drm_gem_object_lookup(dev, filp, gem_handle);
308 if (!obj) {
309 DRM_ERROR("failed to lookup gem object.\n");
310 return;
311 }
312
313 exynos_gem_obj = to_exynos_gem_obj(obj);
314
315 drm_gem_object_unreference_unlocked(obj);
316
317 /*
318 * decrease obj->refcount one more time because we has already
319 * increased it at exynos_drm_gem_get_dma_addr().
320 */
321 drm_gem_object_unreference_unlocked(obj);
322}
323
324int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,
325 struct drm_file *file_priv)
326{
327 struct drm_exynos_gem_map_off *args = data;
328
329 DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n",
330 args->handle, (unsigned long)args->offset);
331
332 if (!(dev->driver->driver_features & DRIVER_GEM)) {
333 DRM_ERROR("does not support GEM.\n");
334 return -ENODEV;
335 }
336
337 return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle,
338 &args->offset);
339}
340
341int exynos_drm_gem_mmap_buffer(struct file *filp,
342 struct vm_area_struct *vma)
343{
344 struct drm_gem_object *obj = filp->private_data;
345 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
346 struct drm_device *drm_dev = obj->dev;
347 struct exynos_drm_gem_buf *buffer;
348 unsigned long vm_size;
349 int ret;
350
351 WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
352
353 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
354 vma->vm_private_data = obj;
355 vma->vm_ops = drm_dev->driver->gem_vm_ops;
356
357 update_vm_cache_attr(exynos_gem_obj, vma);
358
359 vm_size = vma->vm_end - vma->vm_start;
360
361 /*
362 * a buffer contains information to physically continuous memory
363 * allocated by user request or at framebuffer creation.
364 */
365 buffer = exynos_gem_obj->buffer;
366
367 /* check if user-requested size is valid. */
368 if (vm_size > buffer->size)
369 return -EINVAL;
370
371 ret = dma_mmap_attrs(drm_dev->dev, vma, buffer->pages,
372 buffer->dma_addr, buffer->size,
373 &buffer->dma_attrs);
374 if (ret < 0) {
375 DRM_ERROR("failed to mmap.\n");
376 return ret;
377 }
378
379 /*
380 * take a reference to this mapping of the object. And this reference
381 * is unreferenced by the corresponding vm_close call.
382 */
383 drm_gem_object_reference(obj);
384
385 drm_vm_open_locked(drm_dev, vma);
386
387 return 0;
388}
389
390int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
391 struct drm_file *file_priv)
392{
393 struct drm_exynos_file_private *exynos_file_priv;
394 struct drm_exynos_gem_mmap *args = data;
395 struct drm_gem_object *obj;
396 struct file *anon_filp;
397 unsigned long addr;
398
399 if (!(dev->driver->driver_features & DRIVER_GEM)) {
400 DRM_ERROR("does not support GEM.\n");
401 return -ENODEV;
402 }
403
404 mutex_lock(&dev->struct_mutex);
405
406 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
407 if (!obj) {
408 DRM_ERROR("failed to lookup gem object.\n");
409 mutex_unlock(&dev->struct_mutex);
410 return -EINVAL;
411 }
412
413 exynos_file_priv = file_priv->driver_priv;
414 anon_filp = exynos_file_priv->anon_filp;
415 anon_filp->private_data = obj;
416
417 addr = vm_mmap(anon_filp, 0, args->size, PROT_READ | PROT_WRITE,
418 MAP_SHARED, 0);
419
420 drm_gem_object_unreference(obj);
421
422 if (IS_ERR_VALUE(addr)) {
423 mutex_unlock(&dev->struct_mutex);
424 return (int)addr;
425 }
426
427 mutex_unlock(&dev->struct_mutex);
428
429 args->mapped = addr;
430
431 DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped);
432
433 return 0;
434}
435
436int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
437 struct drm_file *file_priv)
438{ struct exynos_drm_gem_obj *exynos_gem_obj;
439 struct drm_exynos_gem_info *args = data;
440 struct drm_gem_object *obj;
441
442 mutex_lock(&dev->struct_mutex);
443
444 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
445 if (!obj) {
446 DRM_ERROR("failed to lookup gem object.\n");
447 mutex_unlock(&dev->struct_mutex);
448 return -EINVAL;
449 }
450
451 exynos_gem_obj = to_exynos_gem_obj(obj);
452
453 args->flags = exynos_gem_obj->flags;
454 args->size = exynos_gem_obj->size;
455
456 drm_gem_object_unreference(obj);
457 mutex_unlock(&dev->struct_mutex);
458
459 return 0;
460}
461
462struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma)
463{
464 struct vm_area_struct *vma_copy;
465
466 vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL);
467 if (!vma_copy)
468 return NULL;
469
470 if (vma->vm_ops && vma->vm_ops->open)
471 vma->vm_ops->open(vma);
472
473 if (vma->vm_file)
474 get_file(vma->vm_file);
475
476 memcpy(vma_copy, vma, sizeof(*vma));
477
478 vma_copy->vm_mm = NULL;
479 vma_copy->vm_next = NULL;
480 vma_copy->vm_prev = NULL;
481
482 return vma_copy;
483}
484
485void exynos_gem_put_vma(struct vm_area_struct *vma)
486{
487 if (!vma)
488 return;
489
490 if (vma->vm_ops && vma->vm_ops->close)
491 vma->vm_ops->close(vma);
492
493 if (vma->vm_file)
494 fput(vma->vm_file);
495
496 kfree(vma);
497}
498
499int exynos_gem_get_pages_from_userptr(unsigned long start,
500 unsigned int npages,
501 struct page **pages,
502 struct vm_area_struct *vma)
503{
504 int get_npages;
505
506 /* the memory region mmaped with VM_PFNMAP. */
507 if (vma_is_io(vma)) {
508 unsigned int i;
509
510 for (i = 0; i < npages; ++i, start += PAGE_SIZE) {
511 unsigned long pfn;
512 int ret = follow_pfn(vma, start, &pfn);
513 if (ret)
514 return ret;
515
516 pages[i] = pfn_to_page(pfn);
517 }
518
519 if (i != npages) {
520 DRM_ERROR("failed to get user_pages.\n");
521 return -EINVAL;
522 }
523
524 return 0;
525 }
526
527 get_npages = get_user_pages(current, current->mm, start,
528 npages, 1, 1, pages, NULL);
529 get_npages = max(get_npages, 0);
530 if (get_npages != npages) {
531 DRM_ERROR("failed to get user_pages.\n");
532 while (get_npages)
533 put_page(pages[--get_npages]);
534 return -EFAULT;
535 }
536
537 return 0;
538}
539
540void exynos_gem_put_pages_to_userptr(struct page **pages,
541 unsigned int npages,
542 struct vm_area_struct *vma)
543{
544 if (!vma_is_io(vma)) {
545 unsigned int i;
546
547 for (i = 0; i < npages; i++) {
548 set_page_dirty_lock(pages[i]);
549
550 /*
551 * undo the reference we took when populating
552 * the table.
553 */
554 put_page(pages[i]);
555 }
556 }
557}
558
559int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
560 struct sg_table *sgt,
561 enum dma_data_direction dir)
562{
563 int nents;
564
565 mutex_lock(&drm_dev->struct_mutex);
566
567 nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
568 if (!nents) {
569 DRM_ERROR("failed to map sgl with dma.\n");
570 mutex_unlock(&drm_dev->struct_mutex);
571 return nents;
572 }
573
574 mutex_unlock(&drm_dev->struct_mutex);
575 return 0;
576}
577
578void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev,
579 struct sg_table *sgt,
580 enum dma_data_direction dir)
581{
582 dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
583}
584
585void exynos_drm_gem_free_object(struct drm_gem_object *obj)
586{
587 struct exynos_drm_gem_obj *exynos_gem_obj;
588 struct exynos_drm_gem_buf *buf;
589
590 exynos_gem_obj = to_exynos_gem_obj(obj);
591 buf = exynos_gem_obj->buffer;
592
593 if (obj->import_attach)
594 drm_prime_gem_destroy(obj, buf->sgt);
595
596 exynos_drm_gem_destroy(to_exynos_gem_obj(obj));
597}
598
599int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
600 struct drm_device *dev,
601 struct drm_mode_create_dumb *args)
602{
603 struct exynos_drm_gem_obj *exynos_gem_obj;
604 int ret;
605
606 /*
607 * allocate memory to be used for framebuffer.
608 * - this callback would be called by user application
609 * with DRM_IOCTL_MODE_CREATE_DUMB command.
610 */
611
612 args->pitch = args->width * ((args->bpp + 7) / 8);
613 args->size = args->pitch * args->height;
614
615 exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG |
616 EXYNOS_BO_WC, args->size);
617 /*
618 * If physically contiguous memory allocation fails and if IOMMU is
619 * supported then try to get buffer from non physically contiguous
620 * memory area.
621 */
622 if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) {
623 dev_warn(dev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
624 exynos_gem_obj = exynos_drm_gem_create(dev,
625 EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC,
626 args->size);
627 }
628
629 if (IS_ERR(exynos_gem_obj))
630 return PTR_ERR(exynos_gem_obj);
631
632 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
633 &args->handle);
634 if (ret) {
635 exynos_drm_gem_destroy(exynos_gem_obj);
636 return ret;
637 }
638
639 return 0;
640}
641
642int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
643 struct drm_device *dev, uint32_t handle,
644 uint64_t *offset)
645{
646 struct drm_gem_object *obj;
647 int ret = 0;
648
649 mutex_lock(&dev->struct_mutex);
650
651 /*
652 * get offset of memory allocated for drm framebuffer.
653 * - this callback would be called by user application
654 * with DRM_IOCTL_MODE_MAP_DUMB command.
655 */
656
657 obj = drm_gem_object_lookup(dev, file_priv, handle);
658 if (!obj) {
659 DRM_ERROR("failed to lookup gem object.\n");
660 ret = -EINVAL;
661 goto unlock;
662 }
663
664 ret = drm_gem_create_mmap_offset(obj);
665 if (ret)
666 goto out;
667
668 *offset = drm_vma_node_offset_addr(&obj->vma_node);
669 DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
670
671out:
672 drm_gem_object_unreference(obj);
673unlock:
674 mutex_unlock(&dev->struct_mutex);
675 return ret;
676}
677
678int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
679{
680 struct drm_gem_object *obj = vma->vm_private_data;
681 struct drm_device *dev = obj->dev;
682 unsigned long f_vaddr;
683 pgoff_t page_offset;
684 int ret;
685
686 page_offset = ((unsigned long)vmf->virtual_address -
687 vma->vm_start) >> PAGE_SHIFT;
688 f_vaddr = (unsigned long)vmf->virtual_address;
689
690 mutex_lock(&dev->struct_mutex);
691
692 ret = exynos_drm_gem_map_buf(obj, vma, f_vaddr, page_offset);
693 if (ret < 0)
694 DRM_ERROR("failed to map a buffer with user.\n");
695
696 mutex_unlock(&dev->struct_mutex);
697
698 return convert_to_vm_err_msg(ret);
699}
700
701int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
702{
703 struct exynos_drm_gem_obj *exynos_gem_obj;
704 struct drm_gem_object *obj;
705 int ret;
706
707 /* set vm_area_struct. */
708 ret = drm_gem_mmap(filp, vma);
709 if (ret < 0) {
710 DRM_ERROR("failed to mmap.\n");
711 return ret;
712 }
713
714 obj = vma->vm_private_data;
715 exynos_gem_obj = to_exynos_gem_obj(obj);
716
717 ret = check_gem_flags(exynos_gem_obj->flags);
718 if (ret) {
719 drm_gem_vm_close(vma);
720 drm_gem_free_mmap_offset(obj);
721 return ret;
722 }
723
724 vma->vm_flags &= ~VM_PFNMAP;
725 vma->vm_flags |= VM_MIXEDMAP;
726
727 update_vm_cache_attr(exynos_gem_obj, vma);
728
729 return ret;
730}