| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0 OR MIT |
| 2 | /* Copyright 2018-2019 Qiang Yu <yuq825@gmail.com> */ |
| 3 | |
| 4 | #include <drm/drm_prime.h> |
| 5 | #include <linux/pagemap.h> |
| 6 | #include <linux/dma-mapping.h> |
| 7 | |
| 8 | #include "lima_object.h" |
| 9 | |
| 10 | void lima_bo_destroy(struct lima_bo *bo) |
| 11 | { |
| 12 | if (bo->sgt) { |
| 13 | kfree(bo->pages); |
| 14 | drm_prime_gem_destroy(&bo->gem, bo->sgt); |
| 15 | } else { |
| 16 | if (bo->pages_dma_addr) { |
| 17 | int i, npages = bo->gem.size >> PAGE_SHIFT; |
| 18 | |
| 19 | for (i = 0; i < npages; i++) { |
| 20 | if (bo->pages_dma_addr[i]) |
| 21 | dma_unmap_page(bo->gem.dev->dev, |
| 22 | bo->pages_dma_addr[i], |
| 23 | PAGE_SIZE, DMA_BIDIRECTIONAL); |
| 24 | } |
| 25 | } |
| 26 | |
| 27 | if (bo->pages) |
| 28 | drm_gem_put_pages(&bo->gem, bo->pages, true, true); |
| 29 | } |
| 30 | |
| 31 | kfree(bo->pages_dma_addr); |
| 32 | drm_gem_object_release(&bo->gem); |
| 33 | kfree(bo); |
| 34 | } |
| 35 | |
| 36 | static struct lima_bo *lima_bo_create_struct(struct lima_device *dev, u32 size, u32 flags) |
| 37 | { |
| 38 | struct lima_bo *bo; |
| 39 | int err; |
| 40 | |
| 41 | size = PAGE_ALIGN(size); |
| 42 | |
| 43 | bo = kzalloc(sizeof(*bo), GFP_KERNEL); |
| 44 | if (!bo) |
| 45 | return ERR_PTR(-ENOMEM); |
| 46 | |
| 47 | mutex_init(&bo->lock); |
| 48 | INIT_LIST_HEAD(&bo->va); |
| 49 | |
| 50 | err = drm_gem_object_init(dev->ddev, &bo->gem, size); |
| 51 | if (err) { |
| 52 | kfree(bo); |
| 53 | return ERR_PTR(err); |
| 54 | } |
| 55 | |
| 56 | return bo; |
| 57 | } |
| 58 | |
| 59 | struct lima_bo *lima_bo_create(struct lima_device *dev, u32 size, |
| 60 | u32 flags, struct sg_table *sgt) |
| 61 | { |
| 62 | int i, err; |
| 63 | size_t npages; |
| 64 | struct lima_bo *bo, *ret; |
| 65 | |
| 66 | bo = lima_bo_create_struct(dev, size, flags); |
| 67 | if (IS_ERR(bo)) |
| 68 | return bo; |
| 69 | |
| 70 | npages = bo->gem.size >> PAGE_SHIFT; |
| 71 | |
| 72 | bo->pages_dma_addr = kcalloc(npages, sizeof(dma_addr_t), GFP_KERNEL); |
| 73 | if (!bo->pages_dma_addr) { |
| 74 | ret = ERR_PTR(-ENOMEM); |
| 75 | goto err_out; |
| 76 | } |
| 77 | |
| 78 | if (sgt) { |
| 79 | bo->sgt = sgt; |
| 80 | |
| 81 | bo->pages = kcalloc(npages, sizeof(*bo->pages), GFP_KERNEL); |
| 82 | if (!bo->pages) { |
| 83 | ret = ERR_PTR(-ENOMEM); |
| 84 | goto err_out; |
| 85 | } |
| 86 | |
| 87 | err = drm_prime_sg_to_page_addr_arrays( |
| 88 | sgt, bo->pages, bo->pages_dma_addr, npages); |
| 89 | if (err) { |
| 90 | ret = ERR_PTR(err); |
| 91 | goto err_out; |
| 92 | } |
| 93 | } else { |
| 94 | mapping_set_gfp_mask(bo->gem.filp->f_mapping, GFP_DMA32); |
| 95 | bo->pages = drm_gem_get_pages(&bo->gem); |
| 96 | if (IS_ERR(bo->pages)) { |
| 97 | ret = ERR_CAST(bo->pages); |
| 98 | bo->pages = NULL; |
| 99 | goto err_out; |
| 100 | } |
| 101 | |
| 102 | for (i = 0; i < npages; i++) { |
| 103 | dma_addr_t addr = dma_map_page(dev->dev, bo->pages[i], 0, |
| 104 | PAGE_SIZE, DMA_BIDIRECTIONAL); |
| 105 | if (dma_mapping_error(dev->dev, addr)) { |
| 106 | ret = ERR_PTR(-EFAULT); |
| 107 | goto err_out; |
| 108 | } |
| 109 | bo->pages_dma_addr[i] = addr; |
| 110 | } |
| 111 | |
| 112 | } |
| 113 | |
| 114 | return bo; |
| 115 | |
| 116 | err_out: |
| 117 | lima_bo_destroy(bo); |
| 118 | return ret; |
| 119 | } |