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,
96 * A generic iommu_map_sg() function is being reviewed and will hopefully be
97 * merged soon. At that point this function can be dropped in favour of the
98 * one provided by the IOMMU API.
100 static ssize_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
101 struct scatterlist *sg, unsigned int nents,
104 struct scatterlist *s;
109 for_each_sg(sg, s, nents, i) {
110 phys_addr_t phys = page_to_phys(sg_page(s));
111 size_t length = s->offset + s->length;
113 err = iommu_map(domain, iova + offset, phys, length, prot);
115 iommu_unmap(domain, iova, offset);
125 static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
127 int prot = IOMMU_READ | IOMMU_WRITE;
133 bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
137 err = drm_mm_insert_node_generic(&tegra->mm, bo->mm, bo->gem.size,
140 dev_err(tegra->drm->dev, "out of I/O virtual memory: %zd\n",
145 bo->paddr = bo->mm->start;
147 err = __iommu_map_sg(tegra->domain, bo->paddr, bo->sgt->sgl,
148 bo->sgt->nents, prot);
150 dev_err(tegra->drm->dev, "failed to map buffer: %zd\n", err);
159 drm_mm_remove_node(bo->mm);
165 static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
170 iommu_unmap(tegra->domain, bo->paddr, bo->size);
171 drm_mm_remove_node(bo->mm);
177 static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
183 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
185 return ERR_PTR(-ENOMEM);
187 host1x_bo_init(&bo->base, &tegra_bo_ops);
188 size = round_up(size, PAGE_SIZE);
190 err = drm_gem_object_init(drm, &bo->gem, size);
194 err = drm_gem_create_mmap_offset(&bo->gem);
201 drm_gem_object_release(&bo->gem);
207 static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
210 drm_gem_put_pages(&bo->gem, bo->pages, true, true);
211 sg_free_table(bo->sgt);
213 } else if (bo->vaddr) {
214 dma_free_writecombine(drm->dev, bo->gem.size, bo->vaddr,
219 static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo,
222 bo->pages = drm_gem_get_pages(&bo->gem);
223 if (IS_ERR(bo->pages))
224 return PTR_ERR(bo->pages);
226 bo->num_pages = size >> PAGE_SHIFT;
228 bo->sgt = drm_prime_pages_to_sg(bo->pages, bo->num_pages);
229 if (IS_ERR(bo->sgt)) {
230 drm_gem_put_pages(&bo->gem, bo->pages, false, false);
231 return PTR_ERR(bo->sgt);
237 static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo,
240 struct tegra_drm *tegra = drm->dev_private;
244 err = tegra_bo_get_pages(drm, bo, size);
248 err = tegra_bo_iommu_map(tegra, bo);
250 tegra_bo_free(drm, bo);
254 bo->vaddr = dma_alloc_writecombine(drm->dev, size, &bo->paddr,
255 GFP_KERNEL | __GFP_NOWARN);
258 "failed to allocate buffer of size %zu\n",
267 struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
273 bo = tegra_bo_alloc_object(drm, size);
277 err = tegra_bo_alloc(drm, bo, size);
281 if (flags & DRM_TEGRA_GEM_CREATE_TILED)
282 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
284 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
285 bo->flags |= TEGRA_BO_BOTTOM_UP;
290 drm_gem_object_release(&bo->gem);
295 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
296 struct drm_device *drm,
304 bo = tegra_bo_create(drm, size, flags);
308 err = drm_gem_handle_create(file, &bo->gem, handle);
310 tegra_bo_free_object(&bo->gem);
314 drm_gem_object_unreference_unlocked(&bo->gem);
319 static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
322 struct tegra_drm *tegra = drm->dev_private;
323 struct dma_buf_attachment *attach;
327 bo = tegra_bo_alloc_object(drm, buf->size);
331 attach = dma_buf_attach(buf, drm->dev);
332 if (IS_ERR(attach)) {
333 err = PTR_ERR(attach);
339 bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
345 if (IS_ERR(bo->sgt)) {
346 err = PTR_ERR(bo->sgt);
351 err = tegra_bo_iommu_map(tegra, bo);
355 if (bo->sgt->nents > 1) {
360 bo->paddr = sg_dma_address(bo->sgt->sgl);
363 bo->gem.import_attach = attach;
368 if (!IS_ERR_OR_NULL(bo->sgt))
369 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
371 dma_buf_detach(buf, attach);
374 drm_gem_object_release(&bo->gem);
379 void tegra_bo_free_object(struct drm_gem_object *gem)
381 struct tegra_drm *tegra = gem->dev->dev_private;
382 struct tegra_bo *bo = to_tegra_bo(gem);
385 tegra_bo_iommu_unmap(tegra, bo);
387 if (gem->import_attach) {
388 dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
390 drm_prime_gem_destroy(gem, NULL);
392 tegra_bo_free(gem->dev, bo);
395 drm_gem_object_release(gem);
399 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
400 struct drm_mode_create_dumb *args)
402 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
403 struct tegra_drm *tegra = drm->dev_private;
406 args->pitch = round_up(min_pitch, tegra->pitch_align);
407 args->size = args->pitch * args->height;
409 bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
417 int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
418 u32 handle, u64 *offset)
420 struct drm_gem_object *gem;
423 mutex_lock(&drm->struct_mutex);
425 gem = drm_gem_object_lookup(drm, file, handle);
427 dev_err(drm->dev, "failed to lookup GEM object\n");
428 mutex_unlock(&drm->struct_mutex);
432 bo = to_tegra_bo(gem);
434 *offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
436 drm_gem_object_unreference(gem);
438 mutex_unlock(&drm->struct_mutex);
443 static int tegra_bo_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
445 struct drm_gem_object *gem = vma->vm_private_data;
446 struct tegra_bo *bo = to_tegra_bo(gem);
452 return VM_FAULT_SIGBUS;
454 offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >> PAGE_SHIFT;
455 page = bo->pages[offset];
457 err = vm_insert_page(vma, (unsigned long)vmf->virtual_address, page);
464 return VM_FAULT_NOPAGE;
470 return VM_FAULT_SIGBUS;
473 const struct vm_operations_struct tegra_bo_vm_ops = {
474 .fault = tegra_bo_fault,
475 .open = drm_gem_vm_open,
476 .close = drm_gem_vm_close,
479 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
481 struct drm_gem_object *gem;
485 ret = drm_gem_mmap(file, vma);
489 gem = vma->vm_private_data;
490 bo = to_tegra_bo(gem);
493 unsigned long vm_pgoff = vma->vm_pgoff;
495 vma->vm_flags &= ~VM_PFNMAP;
498 ret = dma_mmap_writecombine(gem->dev->dev, vma, bo->vaddr,
499 bo->paddr, gem->size);
501 drm_gem_vm_close(vma);
505 vma->vm_pgoff = vm_pgoff;
507 pgprot_t prot = vm_get_page_prot(vma->vm_flags);
509 vma->vm_flags |= VM_MIXEDMAP;
510 vma->vm_flags &= ~VM_PFNMAP;
512 vma->vm_page_prot = pgprot_writecombine(prot);
518 static struct sg_table *
519 tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
520 enum dma_data_direction dir)
522 struct drm_gem_object *gem = attach->dmabuf->priv;
523 struct tegra_bo *bo = to_tegra_bo(gem);
524 struct sg_table *sgt;
526 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
531 struct scatterlist *sg;
534 if (sg_alloc_table(sgt, bo->num_pages, GFP_KERNEL))
537 for_each_sg(sgt->sgl, sg, bo->num_pages, i)
538 sg_set_page(sg, bo->pages[i], PAGE_SIZE, 0);
540 if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0)
543 if (sg_alloc_table(sgt, 1, GFP_KERNEL))
546 sg_dma_address(sgt->sgl) = bo->paddr;
547 sg_dma_len(sgt->sgl) = gem->size;
558 static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
559 struct sg_table *sgt,
560 enum dma_data_direction dir)
562 struct drm_gem_object *gem = attach->dmabuf->priv;
563 struct tegra_bo *bo = to_tegra_bo(gem);
566 dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
572 static void tegra_gem_prime_release(struct dma_buf *buf)
574 drm_gem_dmabuf_release(buf);
577 static void *tegra_gem_prime_kmap_atomic(struct dma_buf *buf,
583 static void tegra_gem_prime_kunmap_atomic(struct dma_buf *buf,
589 static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page)
594 static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page,
599 static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
604 static void *tegra_gem_prime_vmap(struct dma_buf *buf)
606 struct drm_gem_object *gem = buf->priv;
607 struct tegra_bo *bo = to_tegra_bo(gem);
612 static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr)
616 static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
617 .map_dma_buf = tegra_gem_prime_map_dma_buf,
618 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
619 .release = tegra_gem_prime_release,
620 .kmap_atomic = tegra_gem_prime_kmap_atomic,
621 .kunmap_atomic = tegra_gem_prime_kunmap_atomic,
622 .kmap = tegra_gem_prime_kmap,
623 .kunmap = tegra_gem_prime_kunmap,
624 .mmap = tegra_gem_prime_mmap,
625 .vmap = tegra_gem_prime_vmap,
626 .vunmap = tegra_gem_prime_vunmap,
629 struct dma_buf *tegra_gem_prime_export(struct drm_device *drm,
630 struct drm_gem_object *gem,
633 return dma_buf_export(gem, &tegra_gem_prime_dmabuf_ops, gem->size,
637 struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
642 if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
643 struct drm_gem_object *gem = buf->priv;
645 if (gem->dev == drm) {
646 drm_gem_object_reference(gem);
651 bo = tegra_bo_import(drm, buf);