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);
135 struct dma_buf_map map;
140 } else if (obj->gem.import_attach) {
141 ret = dma_buf_vmap(obj->gem.import_attach->dmabuf, &map);
142 return ret ? NULL : map.vaddr;
144 return vmap(obj->pages, obj->num_pages, VM_MAP,
145 pgprot_writecombine(PAGE_KERNEL));
149 static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
151 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
152 struct dma_buf_map map = DMA_BUF_MAP_INIT_VADDR(addr);
156 else if (obj->gem.import_attach)
157 dma_buf_vunmap(obj->gem.import_attach->dmabuf, &map);
162 static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
164 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
166 drm_gem_object_get(&obj->gem);
171 static const struct host1x_bo_ops tegra_bo_ops = {
175 .unpin = tegra_bo_unpin,
176 .mmap = tegra_bo_mmap,
177 .munmap = tegra_bo_munmap,
180 static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
182 int prot = IOMMU_READ | IOMMU_WRITE;
188 bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
192 mutex_lock(&tegra->mm_lock);
194 err = drm_mm_insert_node_generic(&tegra->mm,
195 bo->mm, bo->gem.size, PAGE_SIZE, 0, 0);
197 dev_err(tegra->drm->dev, "out of I/O virtual memory: %d\n",
202 bo->iova = bo->mm->start;
204 bo->size = iommu_map_sgtable(tegra->domain, bo->iova, bo->sgt, prot);
206 dev_err(tegra->drm->dev, "failed to map buffer\n");
211 mutex_unlock(&tegra->mm_lock);
216 drm_mm_remove_node(bo->mm);
218 mutex_unlock(&tegra->mm_lock);
223 static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
228 mutex_lock(&tegra->mm_lock);
229 iommu_unmap(tegra->domain, bo->iova, bo->size);
230 drm_mm_remove_node(bo->mm);
231 mutex_unlock(&tegra->mm_lock);
238 static const struct drm_gem_object_funcs tegra_gem_object_funcs = {
239 .free = tegra_bo_free_object,
240 .export = tegra_gem_prime_export,
241 .vm_ops = &tegra_bo_vm_ops,
244 static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
250 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
252 return ERR_PTR(-ENOMEM);
254 bo->gem.funcs = &tegra_gem_object_funcs;
256 host1x_bo_init(&bo->base, &tegra_bo_ops);
257 size = round_up(size, PAGE_SIZE);
259 err = drm_gem_object_init(drm, &bo->gem, size);
263 err = drm_gem_create_mmap_offset(&bo->gem);
270 drm_gem_object_release(&bo->gem);
276 static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
279 dma_unmap_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
280 drm_gem_put_pages(&bo->gem, bo->pages, true, true);
281 sg_free_table(bo->sgt);
283 } else if (bo->vaddr) {
284 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->iova);
288 static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
292 bo->pages = drm_gem_get_pages(&bo->gem);
293 if (IS_ERR(bo->pages))
294 return PTR_ERR(bo->pages);
296 bo->num_pages = bo->gem.size >> PAGE_SHIFT;
298 bo->sgt = drm_prime_pages_to_sg(bo->gem.dev, bo->pages, bo->num_pages);
299 if (IS_ERR(bo->sgt)) {
300 err = PTR_ERR(bo->sgt);
304 err = dma_map_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
311 sg_free_table(bo->sgt);
314 drm_gem_put_pages(&bo->gem, bo->pages, false, false);
318 static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
320 struct tegra_drm *tegra = drm->dev_private;
324 err = tegra_bo_get_pages(drm, bo);
328 err = tegra_bo_iommu_map(tegra, bo);
330 tegra_bo_free(drm, bo);
334 size_t size = bo->gem.size;
336 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->iova,
337 GFP_KERNEL | __GFP_NOWARN);
340 "failed to allocate buffer of size %zu\n",
349 struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
355 bo = tegra_bo_alloc_object(drm, size);
359 err = tegra_bo_alloc(drm, bo);
363 if (flags & DRM_TEGRA_GEM_CREATE_TILED)
364 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
366 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
367 bo->flags |= TEGRA_BO_BOTTOM_UP;
372 drm_gem_object_release(&bo->gem);
377 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
378 struct drm_device *drm,
386 bo = tegra_bo_create(drm, size, flags);
390 err = drm_gem_handle_create(file, &bo->gem, handle);
392 tegra_bo_free_object(&bo->gem);
396 drm_gem_object_put(&bo->gem);
401 static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
404 struct tegra_drm *tegra = drm->dev_private;
405 struct dma_buf_attachment *attach;
409 bo = tegra_bo_alloc_object(drm, buf->size);
413 attach = dma_buf_attach(buf, drm->dev);
414 if (IS_ERR(attach)) {
415 err = PTR_ERR(attach);
421 bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
422 if (IS_ERR(bo->sgt)) {
423 err = PTR_ERR(bo->sgt);
428 err = tegra_bo_iommu_map(tegra, bo);
433 bo->gem.import_attach = attach;
438 if (!IS_ERR_OR_NULL(bo->sgt))
439 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
441 dma_buf_detach(buf, attach);
444 drm_gem_object_release(&bo->gem);
449 void tegra_bo_free_object(struct drm_gem_object *gem)
451 struct tegra_drm *tegra = gem->dev->dev_private;
452 struct tegra_bo *bo = to_tegra_bo(gem);
455 tegra_bo_iommu_unmap(tegra, bo);
457 if (gem->import_attach) {
458 dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
460 drm_prime_gem_destroy(gem, NULL);
462 tegra_bo_free(gem->dev, bo);
465 drm_gem_object_release(gem);
469 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
470 struct drm_mode_create_dumb *args)
472 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
473 struct tegra_drm *tegra = drm->dev_private;
476 args->pitch = round_up(min_pitch, tegra->pitch_align);
477 args->size = args->pitch * args->height;
479 bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
487 static vm_fault_t tegra_bo_fault(struct vm_fault *vmf)
489 struct vm_area_struct *vma = vmf->vma;
490 struct drm_gem_object *gem = vma->vm_private_data;
491 struct tegra_bo *bo = to_tegra_bo(gem);
496 return VM_FAULT_SIGBUS;
498 offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
499 page = bo->pages[offset];
501 return vmf_insert_page(vma, vmf->address, page);
504 const struct vm_operations_struct tegra_bo_vm_ops = {
505 .fault = tegra_bo_fault,
506 .open = drm_gem_vm_open,
507 .close = drm_gem_vm_close,
510 int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma)
512 struct tegra_bo *bo = to_tegra_bo(gem);
515 unsigned long vm_pgoff = vma->vm_pgoff;
519 * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(),
520 * and set the vm_pgoff (used as a fake buffer offset by DRM)
521 * to 0 as we want to map the whole buffer.
523 vma->vm_flags &= ~VM_PFNMAP;
526 err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->iova,
529 drm_gem_vm_close(vma);
533 vma->vm_pgoff = vm_pgoff;
535 pgprot_t prot = vm_get_page_prot(vma->vm_flags);
537 vma->vm_flags |= VM_MIXEDMAP;
538 vma->vm_flags &= ~VM_PFNMAP;
540 vma->vm_page_prot = pgprot_writecombine(prot);
546 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
548 struct drm_gem_object *gem;
551 err = drm_gem_mmap(file, vma);
555 gem = vma->vm_private_data;
557 return __tegra_gem_mmap(gem, vma);
560 static struct sg_table *
561 tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
562 enum dma_data_direction dir)
564 struct drm_gem_object *gem = attach->dmabuf->priv;
565 struct tegra_bo *bo = to_tegra_bo(gem);
566 struct sg_table *sgt;
568 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
573 if (sg_alloc_table_from_pages(sgt, bo->pages, bo->num_pages,
574 0, gem->size, GFP_KERNEL) < 0)
577 if (dma_get_sgtable(attach->dev, sgt, bo->vaddr, bo->iova,
582 if (dma_map_sgtable(attach->dev, sgt, dir, 0))
593 static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
594 struct sg_table *sgt,
595 enum dma_data_direction dir)
597 struct drm_gem_object *gem = attach->dmabuf->priv;
598 struct tegra_bo *bo = to_tegra_bo(gem);
601 dma_unmap_sgtable(attach->dev, sgt, dir, 0);
607 static void tegra_gem_prime_release(struct dma_buf *buf)
609 drm_gem_dmabuf_release(buf);
612 static int tegra_gem_prime_begin_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_cpu(drm->dev, bo->sgt, DMA_FROM_DEVICE);
625 static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf,
626 enum dma_data_direction direction)
628 struct drm_gem_object *gem = buf->priv;
629 struct tegra_bo *bo = to_tegra_bo(gem);
630 struct drm_device *drm = gem->dev;
633 dma_sync_sgtable_for_device(drm->dev, bo->sgt, DMA_TO_DEVICE);
638 static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
640 struct drm_gem_object *gem = buf->priv;
643 err = drm_gem_mmap_obj(gem, gem->size, vma);
647 return __tegra_gem_mmap(gem, vma);
650 static int tegra_gem_prime_vmap(struct dma_buf *buf, struct dma_buf_map *map)
652 struct drm_gem_object *gem = buf->priv;
653 struct tegra_bo *bo = to_tegra_bo(gem);
655 dma_buf_map_set_vaddr(map, bo->vaddr);
660 static void tegra_gem_prime_vunmap(struct dma_buf *buf, struct dma_buf_map *map)
664 static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
665 .map_dma_buf = tegra_gem_prime_map_dma_buf,
666 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
667 .release = tegra_gem_prime_release,
668 .begin_cpu_access = tegra_gem_prime_begin_cpu_access,
669 .end_cpu_access = tegra_gem_prime_end_cpu_access,
670 .mmap = tegra_gem_prime_mmap,
671 .vmap = tegra_gem_prime_vmap,
672 .vunmap = tegra_gem_prime_vunmap,
675 struct dma_buf *tegra_gem_prime_export(struct drm_gem_object *gem,
678 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
680 exp_info.exp_name = KBUILD_MODNAME;
681 exp_info.owner = gem->dev->driver->fops->owner;
682 exp_info.ops = &tegra_gem_prime_dmabuf_ops;
683 exp_info.size = gem->size;
684 exp_info.flags = flags;
687 return drm_gem_dmabuf_export(gem->dev, &exp_info);
690 struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
695 if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
696 struct drm_gem_object *gem = buf->priv;
698 if (gem->dev == drm) {
699 drm_gem_object_get(gem);
704 bo = tegra_bo_import(drm, buf);