2 * NVIDIA Tegra DRM GEM helper functions
4 * Copyright (C) 2012 Sascha Hauer, Pengutronix
5 * Copyright (C) 2013 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 inline struct tegra_bo *host1x_to_tegra_bo(struct host1x_bo *bo)
25 return container_of(bo, struct tegra_bo, base);
28 static void tegra_bo_put(struct host1x_bo *bo)
30 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
31 struct drm_device *drm = obj->gem.dev;
33 mutex_lock(&drm->struct_mutex);
34 drm_gem_object_unreference(&obj->gem);
35 mutex_unlock(&drm->struct_mutex);
38 static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt)
40 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
45 static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt)
49 static void *tegra_bo_mmap(struct host1x_bo *bo)
51 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
56 static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
60 static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page)
62 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
64 return obj->vaddr + page * PAGE_SIZE;
67 static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page,
72 static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
74 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
75 struct drm_device *drm = obj->gem.dev;
77 mutex_lock(&drm->struct_mutex);
78 drm_gem_object_reference(&obj->gem);
79 mutex_unlock(&drm->struct_mutex);
84 static const struct host1x_bo_ops tegra_bo_ops = {
88 .unpin = tegra_bo_unpin,
89 .mmap = tegra_bo_mmap,
90 .munmap = tegra_bo_munmap,
91 .kmap = tegra_bo_kmap,
92 .kunmap = tegra_bo_kunmap,
95 static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
97 int prot = IOMMU_READ | IOMMU_WRITE;
103 bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
107 err = drm_mm_insert_node_generic(&tegra->mm, bo->mm, bo->gem.size,
110 dev_err(tegra->drm->dev, "out of I/O virtual memory: %zd\n",
115 bo->paddr = bo->mm->start;
117 err = iommu_map_sg(tegra->domain, bo->paddr, bo->sgt->sgl,
118 bo->sgt->nents, prot);
120 dev_err(tegra->drm->dev, "failed to map buffer: %zd\n", err);
129 drm_mm_remove_node(bo->mm);
135 static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
140 iommu_unmap(tegra->domain, bo->paddr, bo->size);
141 drm_mm_remove_node(bo->mm);
147 static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
153 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
155 return ERR_PTR(-ENOMEM);
157 host1x_bo_init(&bo->base, &tegra_bo_ops);
158 size = round_up(size, PAGE_SIZE);
160 err = drm_gem_object_init(drm, &bo->gem, size);
164 err = drm_gem_create_mmap_offset(&bo->gem);
171 drm_gem_object_release(&bo->gem);
177 static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
180 drm_gem_put_pages(&bo->gem, bo->pages, true, true);
181 sg_free_table(bo->sgt);
183 } else if (bo->vaddr) {
184 dma_free_writecombine(drm->dev, bo->gem.size, bo->vaddr,
189 static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
191 struct scatterlist *s;
192 struct sg_table *sgt;
195 bo->pages = drm_gem_get_pages(&bo->gem);
196 if (IS_ERR(bo->pages))
197 return PTR_ERR(bo->pages);
199 bo->num_pages = bo->gem.size >> PAGE_SHIFT;
201 sgt = drm_prime_pages_to_sg(bo->pages, bo->num_pages);
206 * Fake up the SG table so that dma_map_sg() can be used to flush the
207 * pages associated with it. Note that this relies on the fact that
208 * the DMA API doesn't hook into IOMMU on Tegra, therefore mapping is
209 * only cache maintenance.
211 * TODO: Replace this by drm_clflash_sg() once it can be implemented
212 * without relying on symbols that are not exported.
214 for_each_sg(sgt->sgl, s, sgt->nents, i)
215 sg_dma_address(s) = sg_phys(s);
217 if (dma_map_sg(drm->dev, sgt->sgl, sgt->nents, DMA_TO_DEVICE) == 0)
227 sgt = ERR_PTR(-ENOMEM);
229 drm_gem_put_pages(&bo->gem, bo->pages, false, false);
233 static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
235 struct tegra_drm *tegra = drm->dev_private;
239 err = tegra_bo_get_pages(drm, bo);
243 err = tegra_bo_iommu_map(tegra, bo);
245 tegra_bo_free(drm, bo);
249 size_t size = bo->gem.size;
251 bo->vaddr = dma_alloc_writecombine(drm->dev, size, &bo->paddr,
252 GFP_KERNEL | __GFP_NOWARN);
255 "failed to allocate buffer of size %zu\n",
264 struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
270 bo = tegra_bo_alloc_object(drm, size);
274 err = tegra_bo_alloc(drm, bo);
278 if (flags & DRM_TEGRA_GEM_CREATE_TILED)
279 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
281 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
282 bo->flags |= TEGRA_BO_BOTTOM_UP;
287 drm_gem_object_release(&bo->gem);
292 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
293 struct drm_device *drm,
301 bo = tegra_bo_create(drm, size, flags);
305 err = drm_gem_handle_create(file, &bo->gem, handle);
307 tegra_bo_free_object(&bo->gem);
311 drm_gem_object_unreference_unlocked(&bo->gem);
316 static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
319 struct tegra_drm *tegra = drm->dev_private;
320 struct dma_buf_attachment *attach;
324 bo = tegra_bo_alloc_object(drm, buf->size);
328 attach = dma_buf_attach(buf, drm->dev);
329 if (IS_ERR(attach)) {
330 err = PTR_ERR(attach);
336 bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
342 if (IS_ERR(bo->sgt)) {
343 err = PTR_ERR(bo->sgt);
348 err = tegra_bo_iommu_map(tegra, bo);
352 if (bo->sgt->nents > 1) {
357 bo->paddr = sg_dma_address(bo->sgt->sgl);
360 bo->gem.import_attach = attach;
365 if (!IS_ERR_OR_NULL(bo->sgt))
366 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
368 dma_buf_detach(buf, attach);
371 drm_gem_object_release(&bo->gem);
376 void tegra_bo_free_object(struct drm_gem_object *gem)
378 struct tegra_drm *tegra = gem->dev->dev_private;
379 struct tegra_bo *bo = to_tegra_bo(gem);
382 tegra_bo_iommu_unmap(tegra, bo);
384 if (gem->import_attach) {
385 dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
387 drm_prime_gem_destroy(gem, NULL);
389 tegra_bo_free(gem->dev, bo);
392 drm_gem_object_release(gem);
396 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
397 struct drm_mode_create_dumb *args)
399 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
400 struct tegra_drm *tegra = drm->dev_private;
403 args->pitch = round_up(min_pitch, tegra->pitch_align);
404 args->size = args->pitch * args->height;
406 bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
414 int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
415 u32 handle, u64 *offset)
417 struct drm_gem_object *gem;
420 mutex_lock(&drm->struct_mutex);
422 gem = drm_gem_object_lookup(drm, file, handle);
424 dev_err(drm->dev, "failed to lookup GEM object\n");
425 mutex_unlock(&drm->struct_mutex);
429 bo = to_tegra_bo(gem);
431 *offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
433 drm_gem_object_unreference(gem);
435 mutex_unlock(&drm->struct_mutex);
440 static int tegra_bo_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
442 struct drm_gem_object *gem = vma->vm_private_data;
443 struct tegra_bo *bo = to_tegra_bo(gem);
449 return VM_FAULT_SIGBUS;
451 offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >> PAGE_SHIFT;
452 page = bo->pages[offset];
454 err = vm_insert_page(vma, (unsigned long)vmf->virtual_address, page);
461 return VM_FAULT_NOPAGE;
467 return VM_FAULT_SIGBUS;
470 const struct vm_operations_struct tegra_bo_vm_ops = {
471 .fault = tegra_bo_fault,
472 .open = drm_gem_vm_open,
473 .close = drm_gem_vm_close,
476 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
478 struct drm_gem_object *gem;
482 ret = drm_gem_mmap(file, vma);
486 gem = vma->vm_private_data;
487 bo = to_tegra_bo(gem);
490 unsigned long vm_pgoff = vma->vm_pgoff;
492 vma->vm_flags &= ~VM_PFNMAP;
495 ret = dma_mmap_writecombine(gem->dev->dev, vma, bo->vaddr,
496 bo->paddr, gem->size);
498 drm_gem_vm_close(vma);
502 vma->vm_pgoff = vm_pgoff;
504 pgprot_t prot = vm_get_page_prot(vma->vm_flags);
506 vma->vm_flags |= VM_MIXEDMAP;
507 vma->vm_flags &= ~VM_PFNMAP;
509 vma->vm_page_prot = pgprot_writecombine(prot);
515 static struct sg_table *
516 tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
517 enum dma_data_direction dir)
519 struct drm_gem_object *gem = attach->dmabuf->priv;
520 struct tegra_bo *bo = to_tegra_bo(gem);
521 struct sg_table *sgt;
523 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
528 struct scatterlist *sg;
531 if (sg_alloc_table(sgt, bo->num_pages, GFP_KERNEL))
534 for_each_sg(sgt->sgl, sg, bo->num_pages, i)
535 sg_set_page(sg, bo->pages[i], PAGE_SIZE, 0);
537 if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0)
540 if (sg_alloc_table(sgt, 1, GFP_KERNEL))
543 sg_dma_address(sgt->sgl) = bo->paddr;
544 sg_dma_len(sgt->sgl) = gem->size;
555 static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
556 struct sg_table *sgt,
557 enum dma_data_direction dir)
559 struct drm_gem_object *gem = attach->dmabuf->priv;
560 struct tegra_bo *bo = to_tegra_bo(gem);
563 dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
569 static void tegra_gem_prime_release(struct dma_buf *buf)
571 drm_gem_dmabuf_release(buf);
574 static void *tegra_gem_prime_kmap_atomic(struct dma_buf *buf,
580 static void tegra_gem_prime_kunmap_atomic(struct dma_buf *buf,
586 static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page)
591 static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page,
596 static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
601 static void *tegra_gem_prime_vmap(struct dma_buf *buf)
603 struct drm_gem_object *gem = buf->priv;
604 struct tegra_bo *bo = to_tegra_bo(gem);
609 static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr)
613 static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
614 .map_dma_buf = tegra_gem_prime_map_dma_buf,
615 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
616 .release = tegra_gem_prime_release,
617 .kmap_atomic = tegra_gem_prime_kmap_atomic,
618 .kunmap_atomic = tegra_gem_prime_kunmap_atomic,
619 .kmap = tegra_gem_prime_kmap,
620 .kunmap = tegra_gem_prime_kunmap,
621 .mmap = tegra_gem_prime_mmap,
622 .vmap = tegra_gem_prime_vmap,
623 .vunmap = tegra_gem_prime_vunmap,
626 struct dma_buf *tegra_gem_prime_export(struct drm_device *drm,
627 struct drm_gem_object *gem,
630 return dma_buf_export(gem, &tegra_gem_prime_dmabuf_ops, gem->size,
634 struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
639 if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
640 struct drm_gem_object *gem = buf->priv;
642 if (gem->dev == drm) {
643 drm_gem_object_reference(gem);
648 bo = tegra_bo_import(drm, buf);