1 // SPDX-License-Identifier: GPL-2.0-only
3 * NVIDIA Tegra DRM GEM helper functions
5 * Copyright (C) 2012 Sascha Hauer, Pengutronix
6 * Copyright (C) 2013-2015 NVIDIA CORPORATION, All rights reserved.
8 * Based on the GEM/CMA helpers
10 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
13 #include <linux/dma-buf.h>
14 #include <linux/iommu.h>
15 #include <linux/module.h>
17 #include <drm/drm_drv.h>
18 #include <drm/drm_prime.h>
19 #include <drm/tegra_drm.h>
24 MODULE_IMPORT_NS(DMA_BUF);
26 static unsigned int sg_dma_count_chunks(struct scatterlist *sgl, unsigned int nents)
28 dma_addr_t next = ~(dma_addr_t)0;
29 unsigned int count = 0, i;
30 struct scatterlist *s;
32 for_each_sg(sgl, s, nents, i) {
33 /* sg_dma_address(s) is only valid for entries that have sg_dma_len(s) != 0. */
37 if (sg_dma_address(s) != next) {
38 next = sg_dma_address(s) + sg_dma_len(s);
46 static inline unsigned int sgt_dma_count_chunks(struct sg_table *sgt)
48 return sg_dma_count_chunks(sgt->sgl, sgt->nents);
51 static void tegra_bo_put(struct host1x_bo *bo)
53 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
55 drm_gem_object_put(&obj->gem);
58 static struct host1x_bo_mapping *tegra_bo_pin(struct device *dev, struct host1x_bo *bo,
59 enum dma_data_direction direction)
61 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
62 struct drm_gem_object *gem = &obj->gem;
63 struct host1x_bo_mapping *map;
66 map = kzalloc(sizeof(*map), GFP_KERNEL);
68 return ERR_PTR(-ENOMEM);
71 map->bo = host1x_bo_get(bo);
72 map->direction = direction;
76 * Imported buffers need special treatment to satisfy the semantics of DMA-BUF.
78 if (gem->import_attach) {
79 struct dma_buf *buf = gem->import_attach->dmabuf;
81 map->attach = dma_buf_attach(buf, dev);
82 if (IS_ERR(map->attach)) {
83 err = PTR_ERR(map->attach);
87 map->sgt = dma_buf_map_attachment(map->attach, direction);
88 if (IS_ERR(map->sgt)) {
89 dma_buf_detach(buf, map->attach);
90 err = PTR_ERR(map->sgt);
95 err = sgt_dma_count_chunks(map->sgt);
96 map->size = gem->size;
102 * If we don't have a mapping for this buffer yet, return an SG table
103 * so that host1x can do the mapping for us via the DMA API.
105 map->sgt = kzalloc(sizeof(*map->sgt), GFP_KERNEL);
113 * If the buffer object was allocated from the explicit IOMMU
114 * API code paths, construct an SG table from the pages.
116 err = sg_alloc_table_from_pages(map->sgt, obj->pages, obj->num_pages, 0, gem->size,
122 * If the buffer object had no pages allocated and if it was
123 * not imported, it had to be allocated with the DMA API, so
124 * the DMA API helper can be used.
126 err = dma_get_sgtable(dev, map->sgt, obj->vaddr, obj->iova, gem->size);
131 err = dma_map_sgtable(dev, map->sgt, direction, 0);
137 * If we've manually mapped the buffer object through the IOMMU, make sure to return the
138 * existing IOVA address of our mapping.
141 map->phys = sg_dma_address(map->sgt->sgl);
144 map->phys = obj->iova;
148 map->size = gem->size;
153 sg_free_table(map->sgt);
160 static void tegra_bo_unpin(struct host1x_bo_mapping *map)
163 dma_buf_unmap_attachment(map->attach, map->sgt, map->direction);
164 dma_buf_detach(map->attach->dmabuf, map->attach);
166 dma_unmap_sgtable(map->dev, map->sgt, map->direction, 0);
167 sg_free_table(map->sgt);
171 host1x_bo_put(map->bo);
175 static void *tegra_bo_mmap(struct host1x_bo *bo)
177 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
178 struct iosys_map map;
183 } else if (obj->gem.import_attach) {
184 ret = dma_buf_vmap(obj->gem.import_attach->dmabuf, &map);
185 return ret ? NULL : map.vaddr;
187 return vmap(obj->pages, obj->num_pages, VM_MAP,
188 pgprot_writecombine(PAGE_KERNEL));
192 static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
194 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
195 struct iosys_map map = IOSYS_MAP_INIT_VADDR(addr);
199 else if (obj->gem.import_attach)
200 dma_buf_vunmap(obj->gem.import_attach->dmabuf, &map);
205 static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
207 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
209 drm_gem_object_get(&obj->gem);
214 static const struct host1x_bo_ops tegra_bo_ops = {
218 .unpin = tegra_bo_unpin,
219 .mmap = tegra_bo_mmap,
220 .munmap = tegra_bo_munmap,
223 static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
225 int prot = IOMMU_READ | IOMMU_WRITE;
231 bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
235 mutex_lock(&tegra->mm_lock);
237 err = drm_mm_insert_node_generic(&tegra->mm,
238 bo->mm, bo->gem.size, PAGE_SIZE, 0, 0);
240 dev_err(tegra->drm->dev, "out of I/O virtual memory: %d\n",
245 bo->iova = bo->mm->start;
247 bo->size = iommu_map_sgtable(tegra->domain, bo->iova, bo->sgt, prot);
249 dev_err(tegra->drm->dev, "failed to map buffer\n");
254 mutex_unlock(&tegra->mm_lock);
259 drm_mm_remove_node(bo->mm);
261 mutex_unlock(&tegra->mm_lock);
266 static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
271 mutex_lock(&tegra->mm_lock);
272 iommu_unmap(tegra->domain, bo->iova, bo->size);
273 drm_mm_remove_node(bo->mm);
274 mutex_unlock(&tegra->mm_lock);
281 static const struct drm_gem_object_funcs tegra_gem_object_funcs = {
282 .free = tegra_bo_free_object,
283 .export = tegra_gem_prime_export,
284 .vm_ops = &tegra_bo_vm_ops,
287 static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
293 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
295 return ERR_PTR(-ENOMEM);
297 bo->gem.funcs = &tegra_gem_object_funcs;
299 host1x_bo_init(&bo->base, &tegra_bo_ops);
300 size = round_up(size, PAGE_SIZE);
302 err = drm_gem_object_init(drm, &bo->gem, size);
306 err = drm_gem_create_mmap_offset(&bo->gem);
313 drm_gem_object_release(&bo->gem);
319 static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
322 dma_unmap_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
323 drm_gem_put_pages(&bo->gem, bo->pages, true, true);
324 sg_free_table(bo->sgt);
326 } else if (bo->vaddr) {
327 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->iova);
331 static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
335 bo->pages = drm_gem_get_pages(&bo->gem);
336 if (IS_ERR(bo->pages))
337 return PTR_ERR(bo->pages);
339 bo->num_pages = bo->gem.size >> PAGE_SHIFT;
341 bo->sgt = drm_prime_pages_to_sg(bo->gem.dev, bo->pages, bo->num_pages);
342 if (IS_ERR(bo->sgt)) {
343 err = PTR_ERR(bo->sgt);
347 err = dma_map_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
354 sg_free_table(bo->sgt);
357 drm_gem_put_pages(&bo->gem, bo->pages, false, false);
361 static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
363 struct tegra_drm *tegra = drm->dev_private;
367 err = tegra_bo_get_pages(drm, bo);
371 err = tegra_bo_iommu_map(tegra, bo);
373 tegra_bo_free(drm, bo);
377 size_t size = bo->gem.size;
379 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->iova,
380 GFP_KERNEL | __GFP_NOWARN);
383 "failed to allocate buffer of size %zu\n",
392 struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
398 bo = tegra_bo_alloc_object(drm, size);
402 err = tegra_bo_alloc(drm, bo);
406 if (flags & DRM_TEGRA_GEM_CREATE_TILED)
407 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
409 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
410 bo->flags |= TEGRA_BO_BOTTOM_UP;
415 drm_gem_object_release(&bo->gem);
420 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
421 struct drm_device *drm,
429 bo = tegra_bo_create(drm, size, flags);
433 err = drm_gem_handle_create(file, &bo->gem, handle);
435 tegra_bo_free_object(&bo->gem);
439 drm_gem_object_put(&bo->gem);
444 static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
447 struct tegra_drm *tegra = drm->dev_private;
448 struct dma_buf_attachment *attach;
452 bo = tegra_bo_alloc_object(drm, buf->size);
456 attach = dma_buf_attach(buf, drm->dev);
457 if (IS_ERR(attach)) {
458 err = PTR_ERR(attach);
464 bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
465 if (IS_ERR(bo->sgt)) {
466 err = PTR_ERR(bo->sgt);
471 err = tegra_bo_iommu_map(tegra, bo);
476 bo->gem.import_attach = attach;
481 if (!IS_ERR_OR_NULL(bo->sgt))
482 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
484 dma_buf_detach(buf, attach);
487 drm_gem_object_release(&bo->gem);
492 void tegra_bo_free_object(struct drm_gem_object *gem)
494 struct tegra_drm *tegra = gem->dev->dev_private;
495 struct host1x_bo_mapping *mapping, *tmp;
496 struct tegra_bo *bo = to_tegra_bo(gem);
498 /* remove all mappings of this buffer object from any caches */
499 list_for_each_entry_safe(mapping, tmp, &bo->base.mappings, list) {
501 host1x_bo_unpin(mapping);
503 dev_err(gem->dev->dev, "mapping %p stale for device %s\n", mapping,
504 dev_name(mapping->dev));
508 tegra_bo_iommu_unmap(tegra, bo);
510 if (gem->import_attach) {
511 dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
513 drm_prime_gem_destroy(gem, NULL);
515 tegra_bo_free(gem->dev, bo);
518 drm_gem_object_release(gem);
522 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
523 struct drm_mode_create_dumb *args)
525 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
526 struct tegra_drm *tegra = drm->dev_private;
529 args->pitch = round_up(min_pitch, tegra->pitch_align);
530 args->size = args->pitch * args->height;
532 bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
540 static vm_fault_t tegra_bo_fault(struct vm_fault *vmf)
542 struct vm_area_struct *vma = vmf->vma;
543 struct drm_gem_object *gem = vma->vm_private_data;
544 struct tegra_bo *bo = to_tegra_bo(gem);
549 return VM_FAULT_SIGBUS;
551 offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
552 page = bo->pages[offset];
554 return vmf_insert_page(vma, vmf->address, page);
557 const struct vm_operations_struct tegra_bo_vm_ops = {
558 .fault = tegra_bo_fault,
559 .open = drm_gem_vm_open,
560 .close = drm_gem_vm_close,
563 int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma)
565 struct tegra_bo *bo = to_tegra_bo(gem);
568 unsigned long vm_pgoff = vma->vm_pgoff;
572 * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(),
573 * and set the vm_pgoff (used as a fake buffer offset by DRM)
574 * to 0 as we want to map the whole buffer.
576 vma->vm_flags &= ~VM_PFNMAP;
579 err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->iova,
582 drm_gem_vm_close(vma);
586 vma->vm_pgoff = vm_pgoff;
588 pgprot_t prot = vm_get_page_prot(vma->vm_flags);
590 vma->vm_flags |= VM_MIXEDMAP;
591 vma->vm_flags &= ~VM_PFNMAP;
593 vma->vm_page_prot = pgprot_writecombine(prot);
599 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
601 struct drm_gem_object *gem;
604 err = drm_gem_mmap(file, vma);
608 gem = vma->vm_private_data;
610 return __tegra_gem_mmap(gem, vma);
613 static struct sg_table *
614 tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
615 enum dma_data_direction dir)
617 struct drm_gem_object *gem = attach->dmabuf->priv;
618 struct tegra_bo *bo = to_tegra_bo(gem);
619 struct sg_table *sgt;
621 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
626 if (sg_alloc_table_from_pages(sgt, bo->pages, bo->num_pages,
627 0, gem->size, GFP_KERNEL) < 0)
630 if (dma_get_sgtable(attach->dev, sgt, bo->vaddr, bo->iova,
635 if (dma_map_sgtable(attach->dev, sgt, dir, 0))
646 static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
647 struct sg_table *sgt,
648 enum dma_data_direction dir)
650 struct drm_gem_object *gem = attach->dmabuf->priv;
651 struct tegra_bo *bo = to_tegra_bo(gem);
654 dma_unmap_sgtable(attach->dev, sgt, dir, 0);
660 static void tegra_gem_prime_release(struct dma_buf *buf)
662 drm_gem_dmabuf_release(buf);
665 static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf,
666 enum dma_data_direction direction)
668 struct drm_gem_object *gem = buf->priv;
669 struct tegra_bo *bo = to_tegra_bo(gem);
670 struct drm_device *drm = gem->dev;
673 dma_sync_sgtable_for_cpu(drm->dev, bo->sgt, DMA_FROM_DEVICE);
678 static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf,
679 enum dma_data_direction direction)
681 struct drm_gem_object *gem = buf->priv;
682 struct tegra_bo *bo = to_tegra_bo(gem);
683 struct drm_device *drm = gem->dev;
686 dma_sync_sgtable_for_device(drm->dev, bo->sgt, DMA_TO_DEVICE);
691 static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
693 struct drm_gem_object *gem = buf->priv;
696 err = drm_gem_mmap_obj(gem, gem->size, vma);
700 return __tegra_gem_mmap(gem, vma);
703 static int tegra_gem_prime_vmap(struct dma_buf *buf, struct iosys_map *map)
705 struct drm_gem_object *gem = buf->priv;
706 struct tegra_bo *bo = to_tegra_bo(gem);
708 iosys_map_set_vaddr(map, bo->vaddr);
713 static void tegra_gem_prime_vunmap(struct dma_buf *buf, struct iosys_map *map)
717 static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
718 .map_dma_buf = tegra_gem_prime_map_dma_buf,
719 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
720 .release = tegra_gem_prime_release,
721 .begin_cpu_access = tegra_gem_prime_begin_cpu_access,
722 .end_cpu_access = tegra_gem_prime_end_cpu_access,
723 .mmap = tegra_gem_prime_mmap,
724 .vmap = tegra_gem_prime_vmap,
725 .vunmap = tegra_gem_prime_vunmap,
728 struct dma_buf *tegra_gem_prime_export(struct drm_gem_object *gem,
731 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
733 exp_info.exp_name = KBUILD_MODNAME;
734 exp_info.owner = gem->dev->driver->fops->owner;
735 exp_info.ops = &tegra_gem_prime_dmabuf_ops;
736 exp_info.size = gem->size;
737 exp_info.flags = flags;
740 return drm_gem_dmabuf_export(gem->dev, &exp_info);
743 struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
748 if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
749 struct drm_gem_object *gem = buf->priv;
751 if (gem->dev == drm) {
752 drm_gem_object_get(gem);
757 bo = tegra_bo_import(drm, buf);
764 struct host1x_bo *tegra_gem_lookup(struct drm_file *file, u32 handle)
766 struct drm_gem_object *gem;
769 gem = drm_gem_object_lookup(file, handle);
773 bo = to_tegra_bo(gem);