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);
94 err = sgt_dma_count_chunks(map->sgt);
95 map->size = gem->size;
101 * If we don't have a mapping for this buffer yet, return an SG table
102 * so that host1x can do the mapping for us via the DMA API.
104 map->sgt = kzalloc(sizeof(*map->sgt), GFP_KERNEL);
112 * If the buffer object was allocated from the explicit IOMMU
113 * API code paths, construct an SG table from the pages.
115 err = sg_alloc_table_from_pages(map->sgt, obj->pages, obj->num_pages, 0, gem->size,
121 * If the buffer object had no pages allocated and if it was
122 * not imported, it had to be allocated with the DMA API, so
123 * the DMA API helper can be used.
125 err = dma_get_sgtable(dev, map->sgt, obj->vaddr, obj->iova, gem->size);
130 err = dma_map_sgtable(dev, map->sgt, direction, 0);
136 * If we've manually mapped the buffer object through the IOMMU, make sure to return the
137 * existing IOVA address of our mapping.
140 map->phys = sg_dma_address(map->sgt->sgl);
143 map->phys = obj->iova;
147 map->size = gem->size;
152 sg_free_table(map->sgt);
159 static void tegra_bo_unpin(struct host1x_bo_mapping *map)
162 dma_buf_unmap_attachment(map->attach, map->sgt, map->direction);
163 dma_buf_detach(map->attach->dmabuf, map->attach);
165 dma_unmap_sgtable(map->dev, map->sgt, map->direction, 0);
166 sg_free_table(map->sgt);
170 host1x_bo_put(map->bo);
174 static void *tegra_bo_mmap(struct host1x_bo *bo)
176 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
177 struct iosys_map map;
182 } else if (obj->gem.import_attach) {
183 ret = dma_buf_vmap(obj->gem.import_attach->dmabuf, &map);
184 return ret ? NULL : map.vaddr;
186 return vmap(obj->pages, obj->num_pages, VM_MAP,
187 pgprot_writecombine(PAGE_KERNEL));
191 static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
193 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
194 struct iosys_map map = IOSYS_MAP_INIT_VADDR(addr);
198 else if (obj->gem.import_attach)
199 dma_buf_vunmap(obj->gem.import_attach->dmabuf, &map);
204 static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
206 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
208 drm_gem_object_get(&obj->gem);
213 static const struct host1x_bo_ops tegra_bo_ops = {
217 .unpin = tegra_bo_unpin,
218 .mmap = tegra_bo_mmap,
219 .munmap = tegra_bo_munmap,
222 static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
224 int prot = IOMMU_READ | IOMMU_WRITE;
230 bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
234 mutex_lock(&tegra->mm_lock);
236 err = drm_mm_insert_node_generic(&tegra->mm,
237 bo->mm, bo->gem.size, PAGE_SIZE, 0, 0);
239 dev_err(tegra->drm->dev, "out of I/O virtual memory: %d\n",
244 bo->iova = bo->mm->start;
246 bo->size = iommu_map_sgtable(tegra->domain, bo->iova, bo->sgt, prot);
248 dev_err(tegra->drm->dev, "failed to map buffer\n");
253 mutex_unlock(&tegra->mm_lock);
258 drm_mm_remove_node(bo->mm);
260 mutex_unlock(&tegra->mm_lock);
265 static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
270 mutex_lock(&tegra->mm_lock);
271 iommu_unmap(tegra->domain, bo->iova, bo->size);
272 drm_mm_remove_node(bo->mm);
273 mutex_unlock(&tegra->mm_lock);
280 static const struct drm_gem_object_funcs tegra_gem_object_funcs = {
281 .free = tegra_bo_free_object,
282 .export = tegra_gem_prime_export,
283 .vm_ops = &tegra_bo_vm_ops,
286 static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
292 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
294 return ERR_PTR(-ENOMEM);
296 bo->gem.funcs = &tegra_gem_object_funcs;
298 host1x_bo_init(&bo->base, &tegra_bo_ops);
299 size = round_up(size, PAGE_SIZE);
301 err = drm_gem_object_init(drm, &bo->gem, size);
305 err = drm_gem_create_mmap_offset(&bo->gem);
312 drm_gem_object_release(&bo->gem);
318 static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
321 dma_unmap_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
322 drm_gem_put_pages(&bo->gem, bo->pages, true, true);
323 sg_free_table(bo->sgt);
325 } else if (bo->vaddr) {
326 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->iova);
330 static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
334 bo->pages = drm_gem_get_pages(&bo->gem);
335 if (IS_ERR(bo->pages))
336 return PTR_ERR(bo->pages);
338 bo->num_pages = bo->gem.size >> PAGE_SHIFT;
340 bo->sgt = drm_prime_pages_to_sg(bo->gem.dev, bo->pages, bo->num_pages);
341 if (IS_ERR(bo->sgt)) {
342 err = PTR_ERR(bo->sgt);
346 err = dma_map_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
353 sg_free_table(bo->sgt);
356 drm_gem_put_pages(&bo->gem, bo->pages, false, false);
360 static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
362 struct tegra_drm *tegra = drm->dev_private;
366 err = tegra_bo_get_pages(drm, bo);
370 err = tegra_bo_iommu_map(tegra, bo);
372 tegra_bo_free(drm, bo);
376 size_t size = bo->gem.size;
378 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->iova,
379 GFP_KERNEL | __GFP_NOWARN);
382 "failed to allocate buffer of size %zu\n",
391 struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
397 bo = tegra_bo_alloc_object(drm, size);
401 err = tegra_bo_alloc(drm, bo);
405 if (flags & DRM_TEGRA_GEM_CREATE_TILED)
406 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
408 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
409 bo->flags |= TEGRA_BO_BOTTOM_UP;
414 drm_gem_object_release(&bo->gem);
419 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
420 struct drm_device *drm,
428 bo = tegra_bo_create(drm, size, flags);
432 err = drm_gem_handle_create(file, &bo->gem, handle);
434 tegra_bo_free_object(&bo->gem);
438 drm_gem_object_put(&bo->gem);
443 static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
446 struct tegra_drm *tegra = drm->dev_private;
447 struct dma_buf_attachment *attach;
451 bo = tegra_bo_alloc_object(drm, buf->size);
455 attach = dma_buf_attach(buf, drm->dev);
456 if (IS_ERR(attach)) {
457 err = PTR_ERR(attach);
463 bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
464 if (IS_ERR(bo->sgt)) {
465 err = PTR_ERR(bo->sgt);
470 err = tegra_bo_iommu_map(tegra, bo);
475 bo->gem.import_attach = attach;
480 if (!IS_ERR_OR_NULL(bo->sgt))
481 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
483 dma_buf_detach(buf, attach);
486 drm_gem_object_release(&bo->gem);
491 void tegra_bo_free_object(struct drm_gem_object *gem)
493 struct tegra_drm *tegra = gem->dev->dev_private;
494 struct host1x_bo_mapping *mapping, *tmp;
495 struct tegra_bo *bo = to_tegra_bo(gem);
497 /* remove all mappings of this buffer object from any caches */
498 list_for_each_entry_safe(mapping, tmp, &bo->base.mappings, list) {
500 host1x_bo_unpin(mapping);
502 dev_err(gem->dev->dev, "mapping %p stale for device %s\n", mapping,
503 dev_name(mapping->dev));
507 tegra_bo_iommu_unmap(tegra, bo);
509 if (gem->import_attach) {
510 dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
512 drm_prime_gem_destroy(gem, NULL);
514 tegra_bo_free(gem->dev, bo);
517 drm_gem_object_release(gem);
521 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
522 struct drm_mode_create_dumb *args)
524 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
525 struct tegra_drm *tegra = drm->dev_private;
528 args->pitch = round_up(min_pitch, tegra->pitch_align);
529 args->size = args->pitch * args->height;
531 bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
539 static vm_fault_t tegra_bo_fault(struct vm_fault *vmf)
541 struct vm_area_struct *vma = vmf->vma;
542 struct drm_gem_object *gem = vma->vm_private_data;
543 struct tegra_bo *bo = to_tegra_bo(gem);
548 return VM_FAULT_SIGBUS;
550 offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
551 page = bo->pages[offset];
553 return vmf_insert_page(vma, vmf->address, page);
556 const struct vm_operations_struct tegra_bo_vm_ops = {
557 .fault = tegra_bo_fault,
558 .open = drm_gem_vm_open,
559 .close = drm_gem_vm_close,
562 int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma)
564 struct tegra_bo *bo = to_tegra_bo(gem);
567 unsigned long vm_pgoff = vma->vm_pgoff;
571 * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(),
572 * and set the vm_pgoff (used as a fake buffer offset by DRM)
573 * to 0 as we want to map the whole buffer.
575 vma->vm_flags &= ~VM_PFNMAP;
578 err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->iova,
581 drm_gem_vm_close(vma);
585 vma->vm_pgoff = vm_pgoff;
587 pgprot_t prot = vm_get_page_prot(vma->vm_flags);
589 vma->vm_flags |= VM_MIXEDMAP;
590 vma->vm_flags &= ~VM_PFNMAP;
592 vma->vm_page_prot = pgprot_writecombine(prot);
598 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
600 struct drm_gem_object *gem;
603 err = drm_gem_mmap(file, vma);
607 gem = vma->vm_private_data;
609 return __tegra_gem_mmap(gem, vma);
612 static struct sg_table *
613 tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
614 enum dma_data_direction dir)
616 struct drm_gem_object *gem = attach->dmabuf->priv;
617 struct tegra_bo *bo = to_tegra_bo(gem);
618 struct sg_table *sgt;
620 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
625 if (sg_alloc_table_from_pages(sgt, bo->pages, bo->num_pages,
626 0, gem->size, GFP_KERNEL) < 0)
629 if (dma_get_sgtable(attach->dev, sgt, bo->vaddr, bo->iova,
634 if (dma_map_sgtable(attach->dev, sgt, dir, 0))
645 static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
646 struct sg_table *sgt,
647 enum dma_data_direction dir)
649 struct drm_gem_object *gem = attach->dmabuf->priv;
650 struct tegra_bo *bo = to_tegra_bo(gem);
653 dma_unmap_sgtable(attach->dev, sgt, dir, 0);
659 static void tegra_gem_prime_release(struct dma_buf *buf)
661 drm_gem_dmabuf_release(buf);
664 static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf,
665 enum dma_data_direction direction)
667 struct drm_gem_object *gem = buf->priv;
668 struct tegra_bo *bo = to_tegra_bo(gem);
669 struct drm_device *drm = gem->dev;
672 dma_sync_sgtable_for_cpu(drm->dev, bo->sgt, DMA_FROM_DEVICE);
677 static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf,
678 enum dma_data_direction direction)
680 struct drm_gem_object *gem = buf->priv;
681 struct tegra_bo *bo = to_tegra_bo(gem);
682 struct drm_device *drm = gem->dev;
685 dma_sync_sgtable_for_device(drm->dev, bo->sgt, DMA_TO_DEVICE);
690 static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
692 struct drm_gem_object *gem = buf->priv;
695 err = drm_gem_mmap_obj(gem, gem->size, vma);
699 return __tegra_gem_mmap(gem, vma);
702 static int tegra_gem_prime_vmap(struct dma_buf *buf, struct iosys_map *map)
704 struct drm_gem_object *gem = buf->priv;
705 struct tegra_bo *bo = to_tegra_bo(gem);
707 iosys_map_set_vaddr(map, bo->vaddr);
712 static void tegra_gem_prime_vunmap(struct dma_buf *buf, struct iosys_map *map)
716 static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
717 .map_dma_buf = tegra_gem_prime_map_dma_buf,
718 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
719 .release = tegra_gem_prime_release,
720 .begin_cpu_access = tegra_gem_prime_begin_cpu_access,
721 .end_cpu_access = tegra_gem_prime_end_cpu_access,
722 .mmap = tegra_gem_prime_mmap,
723 .vmap = tegra_gem_prime_vmap,
724 .vunmap = tegra_gem_prime_vunmap,
727 struct dma_buf *tegra_gem_prime_export(struct drm_gem_object *gem,
730 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
732 exp_info.exp_name = KBUILD_MODNAME;
733 exp_info.owner = gem->dev->driver->fops->owner;
734 exp_info.ops = &tegra_gem_prime_dmabuf_ops;
735 exp_info.size = gem->size;
736 exp_info.flags = flags;
739 return drm_gem_dmabuf_export(gem->dev, &exp_info);
742 struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
747 if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
748 struct drm_gem_object *gem = buf->priv;
750 if (gem->dev == drm) {
751 drm_gem_object_get(gem);
756 bo = tegra_bo_import(drm, buf);
763 struct host1x_bo *tegra_gem_lookup(struct drm_file *file, u32 handle)
765 struct drm_gem_object *gem;
768 gem = drm_gem_object_lookup(file, handle);
772 bo = to_tegra_bo(gem);