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>
16 #include <drm/drm_drv.h>
17 #include <drm/drm_prime.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(&obj->gem);
30 /* XXX move this into lib/scatterlist.c? */
31 static int sg_alloc_table_from_sg(struct sg_table *sgt, struct scatterlist *sg,
32 unsigned int nents, gfp_t gfp_mask)
34 struct scatterlist *dst;
38 err = sg_alloc_table(sgt, nents, gfp_mask);
44 for (i = 0; i < nents; i++) {
45 sg_set_page(dst, sg_page(sg), sg->length, 0);
53 static struct sg_table *tegra_bo_pin(struct device *dev, struct host1x_bo *bo,
56 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
61 * If we've manually mapped the buffer object through the IOMMU, make
62 * sure to return the IOVA address of our mapping.
64 * Similarly, for buffers that have been allocated by the DMA API the
65 * physical address can be used for devices that are not attached to
66 * an IOMMU. For these devices, callers must pass a valid pointer via
69 * Imported buffers were also already mapped at import time, so the
70 * existing mapping can be reused.
78 * If we don't have a mapping for this buffer yet, return an SG table
79 * so that host1x can do the mapping for us via the DMA API.
81 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
83 return ERR_PTR(-ENOMEM);
87 * If the buffer object was allocated from the explicit IOMMU
88 * API code paths, construct an SG table from the pages.
90 err = sg_alloc_table_from_pages(sgt, obj->pages, obj->num_pages,
91 0, obj->gem.size, GFP_KERNEL);
94 } else if (obj->sgt) {
96 * If the buffer object already has an SG table but no pages
97 * were allocated for it, it means the buffer was imported and
98 * the SG table needs to be copied to avoid overwriting any
99 * other potential users of the original SG table.
101 err = sg_alloc_table_from_sg(sgt, obj->sgt->sgl,
102 obj->sgt->orig_nents, GFP_KERNEL);
107 * If the buffer object had no pages allocated and if it was
108 * not imported, it had to be allocated with the DMA API, so
109 * the DMA API helper can be used.
111 err = dma_get_sgtable(dev, sgt, obj->vaddr, obj->iova,
124 static void tegra_bo_unpin(struct device *dev, struct sg_table *sgt)
132 static void *tegra_bo_mmap(struct host1x_bo *bo)
134 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
138 else if (obj->gem.import_attach)
139 return dma_buf_vmap(obj->gem.import_attach->dmabuf);
141 return vmap(obj->pages, obj->num_pages, VM_MAP,
142 pgprot_writecombine(PAGE_KERNEL));
145 static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
147 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
151 else if (obj->gem.import_attach)
152 dma_buf_vunmap(obj->gem.import_attach->dmabuf, addr);
157 static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
159 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
161 drm_gem_object_get(&obj->gem);
166 static const struct host1x_bo_ops tegra_bo_ops = {
170 .unpin = tegra_bo_unpin,
171 .mmap = tegra_bo_mmap,
172 .munmap = tegra_bo_munmap,
175 static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
177 int prot = IOMMU_READ | IOMMU_WRITE;
183 bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
187 mutex_lock(&tegra->mm_lock);
189 err = drm_mm_insert_node_generic(&tegra->mm,
190 bo->mm, bo->gem.size, PAGE_SIZE, 0, 0);
192 dev_err(tegra->drm->dev, "out of I/O virtual memory: %d\n",
197 bo->iova = bo->mm->start;
199 bo->size = iommu_map_sgtable(tegra->domain, bo->iova, bo->sgt, prot);
201 dev_err(tegra->drm->dev, "failed to map buffer\n");
206 mutex_unlock(&tegra->mm_lock);
211 drm_mm_remove_node(bo->mm);
213 mutex_unlock(&tegra->mm_lock);
218 static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
223 mutex_lock(&tegra->mm_lock);
224 iommu_unmap(tegra->domain, bo->iova, bo->size);
225 drm_mm_remove_node(bo->mm);
226 mutex_unlock(&tegra->mm_lock);
233 static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
239 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
241 return ERR_PTR(-ENOMEM);
243 host1x_bo_init(&bo->base, &tegra_bo_ops);
244 size = round_up(size, PAGE_SIZE);
246 err = drm_gem_object_init(drm, &bo->gem, size);
250 err = drm_gem_create_mmap_offset(&bo->gem);
257 drm_gem_object_release(&bo->gem);
263 static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
266 dma_unmap_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
267 drm_gem_put_pages(&bo->gem, bo->pages, true, true);
268 sg_free_table(bo->sgt);
270 } else if (bo->vaddr) {
271 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->iova);
275 static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
279 bo->pages = drm_gem_get_pages(&bo->gem);
280 if (IS_ERR(bo->pages))
281 return PTR_ERR(bo->pages);
283 bo->num_pages = bo->gem.size >> PAGE_SHIFT;
285 bo->sgt = drm_prime_pages_to_sg(bo->gem.dev, bo->pages, bo->num_pages);
286 if (IS_ERR(bo->sgt)) {
287 err = PTR_ERR(bo->sgt);
291 err = dma_map_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
298 sg_free_table(bo->sgt);
301 drm_gem_put_pages(&bo->gem, bo->pages, false, false);
305 static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
307 struct tegra_drm *tegra = drm->dev_private;
311 err = tegra_bo_get_pages(drm, bo);
315 err = tegra_bo_iommu_map(tegra, bo);
317 tegra_bo_free(drm, bo);
321 size_t size = bo->gem.size;
323 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->iova,
324 GFP_KERNEL | __GFP_NOWARN);
327 "failed to allocate buffer of size %zu\n",
336 struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
342 bo = tegra_bo_alloc_object(drm, size);
346 err = tegra_bo_alloc(drm, bo);
350 if (flags & DRM_TEGRA_GEM_CREATE_TILED)
351 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
353 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
354 bo->flags |= TEGRA_BO_BOTTOM_UP;
359 drm_gem_object_release(&bo->gem);
364 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
365 struct drm_device *drm,
373 bo = tegra_bo_create(drm, size, flags);
377 err = drm_gem_handle_create(file, &bo->gem, handle);
379 tegra_bo_free_object(&bo->gem);
383 drm_gem_object_put(&bo->gem);
388 static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
391 struct tegra_drm *tegra = drm->dev_private;
392 struct dma_buf_attachment *attach;
396 bo = tegra_bo_alloc_object(drm, buf->size);
400 attach = dma_buf_attach(buf, drm->dev);
401 if (IS_ERR(attach)) {
402 err = PTR_ERR(attach);
408 bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
409 if (IS_ERR(bo->sgt)) {
410 err = PTR_ERR(bo->sgt);
415 err = tegra_bo_iommu_map(tegra, bo);
420 bo->gem.import_attach = attach;
425 if (!IS_ERR_OR_NULL(bo->sgt))
426 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
428 dma_buf_detach(buf, attach);
431 drm_gem_object_release(&bo->gem);
436 void tegra_bo_free_object(struct drm_gem_object *gem)
438 struct tegra_drm *tegra = gem->dev->dev_private;
439 struct tegra_bo *bo = to_tegra_bo(gem);
442 tegra_bo_iommu_unmap(tegra, bo);
444 if (gem->import_attach) {
445 dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
447 drm_prime_gem_destroy(gem, NULL);
449 tegra_bo_free(gem->dev, bo);
452 drm_gem_object_release(gem);
456 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
457 struct drm_mode_create_dumb *args)
459 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
460 struct tegra_drm *tegra = drm->dev_private;
463 args->pitch = round_up(min_pitch, tegra->pitch_align);
464 args->size = args->pitch * args->height;
466 bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
474 static vm_fault_t tegra_bo_fault(struct vm_fault *vmf)
476 struct vm_area_struct *vma = vmf->vma;
477 struct drm_gem_object *gem = vma->vm_private_data;
478 struct tegra_bo *bo = to_tegra_bo(gem);
483 return VM_FAULT_SIGBUS;
485 offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
486 page = bo->pages[offset];
488 return vmf_insert_page(vma, vmf->address, page);
491 const struct vm_operations_struct tegra_bo_vm_ops = {
492 .fault = tegra_bo_fault,
493 .open = drm_gem_vm_open,
494 .close = drm_gem_vm_close,
497 int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma)
499 struct tegra_bo *bo = to_tegra_bo(gem);
502 unsigned long vm_pgoff = vma->vm_pgoff;
506 * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(),
507 * and set the vm_pgoff (used as a fake buffer offset by DRM)
508 * to 0 as we want to map the whole buffer.
510 vma->vm_flags &= ~VM_PFNMAP;
513 err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->iova,
516 drm_gem_vm_close(vma);
520 vma->vm_pgoff = vm_pgoff;
522 pgprot_t prot = vm_get_page_prot(vma->vm_flags);
524 vma->vm_flags |= VM_MIXEDMAP;
525 vma->vm_flags &= ~VM_PFNMAP;
527 vma->vm_page_prot = pgprot_writecombine(prot);
533 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
535 struct drm_gem_object *gem;
538 err = drm_gem_mmap(file, vma);
542 gem = vma->vm_private_data;
544 return __tegra_gem_mmap(gem, vma);
547 static struct sg_table *
548 tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
549 enum dma_data_direction dir)
551 struct drm_gem_object *gem = attach->dmabuf->priv;
552 struct tegra_bo *bo = to_tegra_bo(gem);
553 struct sg_table *sgt;
555 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
560 if (sg_alloc_table_from_pages(sgt, bo->pages, bo->num_pages,
561 0, gem->size, GFP_KERNEL) < 0)
564 if (dma_get_sgtable(attach->dev, sgt, bo->vaddr, bo->iova,
569 if (dma_map_sgtable(attach->dev, sgt, dir, 0))
580 static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
581 struct sg_table *sgt,
582 enum dma_data_direction dir)
584 struct drm_gem_object *gem = attach->dmabuf->priv;
585 struct tegra_bo *bo = to_tegra_bo(gem);
588 dma_unmap_sgtable(attach->dev, sgt, dir, 0);
594 static void tegra_gem_prime_release(struct dma_buf *buf)
596 drm_gem_dmabuf_release(buf);
599 static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf,
600 enum dma_data_direction direction)
602 struct drm_gem_object *gem = buf->priv;
603 struct tegra_bo *bo = to_tegra_bo(gem);
604 struct drm_device *drm = gem->dev;
607 dma_sync_sgtable_for_cpu(drm->dev, bo->sgt, DMA_FROM_DEVICE);
612 static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf,
613 enum dma_data_direction direction)
615 struct drm_gem_object *gem = buf->priv;
616 struct tegra_bo *bo = to_tegra_bo(gem);
617 struct drm_device *drm = gem->dev;
620 dma_sync_sgtable_for_device(drm->dev, bo->sgt, DMA_TO_DEVICE);
625 static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
627 struct drm_gem_object *gem = buf->priv;
630 err = drm_gem_mmap_obj(gem, gem->size, vma);
634 return __tegra_gem_mmap(gem, vma);
637 static void *tegra_gem_prime_vmap(struct dma_buf *buf)
639 struct drm_gem_object *gem = buf->priv;
640 struct tegra_bo *bo = to_tegra_bo(gem);
645 static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr)
649 static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
650 .map_dma_buf = tegra_gem_prime_map_dma_buf,
651 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
652 .release = tegra_gem_prime_release,
653 .begin_cpu_access = tegra_gem_prime_begin_cpu_access,
654 .end_cpu_access = tegra_gem_prime_end_cpu_access,
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_gem_object *gem,
663 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
665 exp_info.exp_name = KBUILD_MODNAME;
666 exp_info.owner = gem->dev->driver->fops->owner;
667 exp_info.ops = &tegra_gem_prime_dmabuf_ops;
668 exp_info.size = gem->size;
669 exp_info.flags = flags;
672 return drm_gem_dmabuf_export(gem->dev, &exp_info);
675 struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
680 if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
681 struct drm_gem_object *gem = buf->priv;
683 if (gem->dev == drm) {
684 drm_gem_object_get(gem);
689 bo = tegra_bo_import(drm, buf);