2 * NVIDIA Tegra DRM GEM helper functions
4 * Copyright (C) 2012 Sascha Hauer, Pengutronix
5 * Copyright (C) 2013-2015 NVIDIA CORPORATION, All rights reserved.
7 * Based on the GEM/CMA helpers
9 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
16 #include <linux/dma-buf.h>
17 #include <linux/iommu.h>
18 #include <drm/tegra_drm.h>
23 static void tegra_bo_put(struct host1x_bo *bo)
25 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
27 drm_gem_object_put_unlocked(&obj->gem);
30 static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt)
32 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
39 static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt)
43 static void *tegra_bo_mmap(struct host1x_bo *bo)
45 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
49 else if (obj->gem.import_attach)
50 return dma_buf_vmap(obj->gem.import_attach->dmabuf);
52 return vmap(obj->pages, obj->num_pages, VM_MAP,
53 pgprot_writecombine(PAGE_KERNEL));
56 static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
58 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
62 else if (obj->gem.import_attach)
63 dma_buf_vunmap(obj->gem.import_attach->dmabuf, addr);
68 static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page)
70 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
73 return obj->vaddr + page * PAGE_SIZE;
74 else if (obj->gem.import_attach)
75 return dma_buf_kmap(obj->gem.import_attach->dmabuf, page);
77 return vmap(obj->pages + page, 1, VM_MAP,
78 pgprot_writecombine(PAGE_KERNEL));
81 static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page,
84 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
88 else if (obj->gem.import_attach)
89 dma_buf_kunmap(obj->gem.import_attach->dmabuf, page, addr);
94 static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
96 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
98 drm_gem_object_get(&obj->gem);
103 static const struct host1x_bo_ops tegra_bo_ops = {
107 .unpin = tegra_bo_unpin,
108 .mmap = tegra_bo_mmap,
109 .munmap = tegra_bo_munmap,
110 .kmap = tegra_bo_kmap,
111 .kunmap = tegra_bo_kunmap,
114 static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
116 int prot = IOMMU_READ | IOMMU_WRITE;
122 bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
126 mutex_lock(&tegra->mm_lock);
128 err = drm_mm_insert_node_generic(&tegra->mm,
129 bo->mm, bo->gem.size, PAGE_SIZE, 0, 0);
131 dev_err(tegra->drm->dev, "out of I/O virtual memory: %d\n",
136 bo->paddr = bo->mm->start;
138 bo->size = iommu_map_sg(tegra->domain, bo->paddr, bo->sgt->sgl,
139 bo->sgt->nents, prot);
141 dev_err(tegra->drm->dev, "failed to map buffer\n");
146 mutex_unlock(&tegra->mm_lock);
151 drm_mm_remove_node(bo->mm);
153 mutex_unlock(&tegra->mm_lock);
158 static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
163 mutex_lock(&tegra->mm_lock);
164 iommu_unmap(tegra->domain, bo->paddr, bo->size);
165 drm_mm_remove_node(bo->mm);
166 mutex_unlock(&tegra->mm_lock);
173 static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
179 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
181 return ERR_PTR(-ENOMEM);
183 host1x_bo_init(&bo->base, &tegra_bo_ops);
184 size = round_up(size, PAGE_SIZE);
186 err = drm_gem_object_init(drm, &bo->gem, size);
190 err = drm_gem_create_mmap_offset(&bo->gem);
197 drm_gem_object_release(&bo->gem);
203 static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
206 dma_unmap_sg(drm->dev, bo->sgt->sgl, bo->sgt->nents,
208 drm_gem_put_pages(&bo->gem, bo->pages, true, true);
209 sg_free_table(bo->sgt);
211 } else if (bo->vaddr) {
212 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->paddr);
216 static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
220 bo->pages = drm_gem_get_pages(&bo->gem);
221 if (IS_ERR(bo->pages))
222 return PTR_ERR(bo->pages);
224 bo->num_pages = bo->gem.size >> PAGE_SHIFT;
226 bo->sgt = drm_prime_pages_to_sg(bo->pages, bo->num_pages);
227 if (IS_ERR(bo->sgt)) {
228 err = PTR_ERR(bo->sgt);
232 err = dma_map_sg(drm->dev, bo->sgt->sgl, bo->sgt->nents,
242 sg_free_table(bo->sgt);
245 drm_gem_put_pages(&bo->gem, bo->pages, false, false);
249 static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
251 struct tegra_drm *tegra = drm->dev_private;
255 err = tegra_bo_get_pages(drm, bo);
259 err = tegra_bo_iommu_map(tegra, bo);
261 tegra_bo_free(drm, bo);
265 size_t size = bo->gem.size;
267 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->paddr,
268 GFP_KERNEL | __GFP_NOWARN);
271 "failed to allocate buffer of size %zu\n",
280 struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
286 bo = tegra_bo_alloc_object(drm, size);
290 err = tegra_bo_alloc(drm, bo);
294 if (flags & DRM_TEGRA_GEM_CREATE_TILED)
295 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
297 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
298 bo->flags |= TEGRA_BO_BOTTOM_UP;
303 drm_gem_object_release(&bo->gem);
308 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
309 struct drm_device *drm,
317 bo = tegra_bo_create(drm, size, flags);
321 err = drm_gem_handle_create(file, &bo->gem, handle);
323 tegra_bo_free_object(&bo->gem);
327 drm_gem_object_put_unlocked(&bo->gem);
332 static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
335 struct tegra_drm *tegra = drm->dev_private;
336 struct dma_buf_attachment *attach;
340 bo = tegra_bo_alloc_object(drm, buf->size);
344 attach = dma_buf_attach(buf, drm->dev);
345 if (IS_ERR(attach)) {
346 err = PTR_ERR(attach);
352 bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
353 if (IS_ERR(bo->sgt)) {
354 err = PTR_ERR(bo->sgt);
359 err = tegra_bo_iommu_map(tegra, bo);
363 if (bo->sgt->nents > 1) {
368 bo->paddr = sg_dma_address(bo->sgt->sgl);
371 bo->gem.import_attach = attach;
376 if (!IS_ERR_OR_NULL(bo->sgt))
377 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
379 dma_buf_detach(buf, attach);
382 drm_gem_object_release(&bo->gem);
387 void tegra_bo_free_object(struct drm_gem_object *gem)
389 struct tegra_drm *tegra = gem->dev->dev_private;
390 struct tegra_bo *bo = to_tegra_bo(gem);
393 tegra_bo_iommu_unmap(tegra, bo);
395 if (gem->import_attach) {
396 dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
398 drm_prime_gem_destroy(gem, NULL);
400 tegra_bo_free(gem->dev, bo);
403 drm_gem_object_release(gem);
407 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
408 struct drm_mode_create_dumb *args)
410 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
411 struct tegra_drm *tegra = drm->dev_private;
414 args->pitch = round_up(min_pitch, tegra->pitch_align);
415 args->size = args->pitch * args->height;
417 bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
425 static int tegra_bo_fault(struct vm_fault *vmf)
427 struct vm_area_struct *vma = vmf->vma;
428 struct drm_gem_object *gem = vma->vm_private_data;
429 struct tegra_bo *bo = to_tegra_bo(gem);
435 return VM_FAULT_SIGBUS;
437 offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
438 page = bo->pages[offset];
440 err = vm_insert_page(vma, vmf->address, page);
447 return VM_FAULT_NOPAGE;
453 return VM_FAULT_SIGBUS;
456 const struct vm_operations_struct tegra_bo_vm_ops = {
457 .fault = tegra_bo_fault,
458 .open = drm_gem_vm_open,
459 .close = drm_gem_vm_close,
462 int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma)
464 struct tegra_bo *bo = to_tegra_bo(gem);
467 unsigned long vm_pgoff = vma->vm_pgoff;
471 * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(),
472 * and set the vm_pgoff (used as a fake buffer offset by DRM)
473 * to 0 as we want to map the whole buffer.
475 vma->vm_flags &= ~VM_PFNMAP;
478 err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->paddr,
481 drm_gem_vm_close(vma);
485 vma->vm_pgoff = vm_pgoff;
487 pgprot_t prot = vm_get_page_prot(vma->vm_flags);
489 vma->vm_flags |= VM_MIXEDMAP;
490 vma->vm_flags &= ~VM_PFNMAP;
492 vma->vm_page_prot = pgprot_writecombine(prot);
498 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
500 struct drm_gem_object *gem;
503 err = drm_gem_mmap(file, vma);
507 gem = vma->vm_private_data;
509 return __tegra_gem_mmap(gem, vma);
512 static struct sg_table *
513 tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
514 enum dma_data_direction dir)
516 struct drm_gem_object *gem = attach->dmabuf->priv;
517 struct tegra_bo *bo = to_tegra_bo(gem);
518 struct sg_table *sgt;
520 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
525 struct scatterlist *sg;
528 if (sg_alloc_table(sgt, bo->num_pages, GFP_KERNEL))
531 for_each_sg(sgt->sgl, sg, bo->num_pages, i)
532 sg_set_page(sg, bo->pages[i], PAGE_SIZE, 0);
534 if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0)
537 if (sg_alloc_table(sgt, 1, GFP_KERNEL))
540 sg_dma_address(sgt->sgl) = bo->paddr;
541 sg_dma_len(sgt->sgl) = gem->size;
552 static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
553 struct sg_table *sgt,
554 enum dma_data_direction dir)
556 struct drm_gem_object *gem = attach->dmabuf->priv;
557 struct tegra_bo *bo = to_tegra_bo(gem);
560 dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
566 static void tegra_gem_prime_release(struct dma_buf *buf)
568 drm_gem_dmabuf_release(buf);
571 static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf,
572 enum dma_data_direction direction)
574 struct drm_gem_object *gem = buf->priv;
575 struct tegra_bo *bo = to_tegra_bo(gem);
576 struct drm_device *drm = gem->dev;
579 dma_sync_sg_for_cpu(drm->dev, bo->sgt->sgl, bo->sgt->nents,
585 static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf,
586 enum dma_data_direction direction)
588 struct drm_gem_object *gem = buf->priv;
589 struct tegra_bo *bo = to_tegra_bo(gem);
590 struct drm_device *drm = gem->dev;
593 dma_sync_sg_for_device(drm->dev, bo->sgt->sgl, bo->sgt->nents,
599 static void *tegra_gem_prime_kmap_atomic(struct dma_buf *buf,
605 static void tegra_gem_prime_kunmap_atomic(struct dma_buf *buf,
611 static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page)
616 static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page,
621 static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
623 struct drm_gem_object *gem = buf->priv;
626 err = drm_gem_mmap_obj(gem, gem->size, vma);
630 return __tegra_gem_mmap(gem, vma);
633 static void *tegra_gem_prime_vmap(struct dma_buf *buf)
635 struct drm_gem_object *gem = buf->priv;
636 struct tegra_bo *bo = to_tegra_bo(gem);
641 static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr)
645 static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
646 .map_dma_buf = tegra_gem_prime_map_dma_buf,
647 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
648 .release = tegra_gem_prime_release,
649 .begin_cpu_access = tegra_gem_prime_begin_cpu_access,
650 .end_cpu_access = tegra_gem_prime_end_cpu_access,
651 .map_atomic = tegra_gem_prime_kmap_atomic,
652 .unmap_atomic = tegra_gem_prime_kunmap_atomic,
653 .map = tegra_gem_prime_kmap,
654 .unmap = tegra_gem_prime_kunmap,
655 .mmap = tegra_gem_prime_mmap,
656 .vmap = tegra_gem_prime_vmap,
657 .vunmap = tegra_gem_prime_vunmap,
660 struct dma_buf *tegra_gem_prime_export(struct drm_device *drm,
661 struct drm_gem_object *gem,
664 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
666 exp_info.ops = &tegra_gem_prime_dmabuf_ops;
667 exp_info.size = gem->size;
668 exp_info.flags = flags;
671 return drm_gem_dmabuf_export(drm, &exp_info);
674 struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
679 if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
680 struct drm_gem_object *gem = buf->priv;
682 if (gem->dev == drm) {
683 drm_gem_object_get(gem);
688 bo = tegra_bo_import(drm, buf);