1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2014-2018 Etnaviv Project 4 */ 5 6 #include <drm/drm_prime.h> 7 #include <linux/dma-buf.h> 8 9 #include "etnaviv_drv.h" 10 #include "etnaviv_gem.h" 11 12 static struct lock_class_key etnaviv_prime_lock_class; 13 14 struct sg_table *etnaviv_gem_prime_get_sg_table(struct drm_gem_object *obj) 15 { 16 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 17 int npages = obj->size >> PAGE_SHIFT; 18 19 if (WARN_ON(!etnaviv_obj->pages)) /* should have already pinned! */ 20 return ERR_PTR(-EINVAL); 21 22 return drm_prime_pages_to_sg(obj->dev, etnaviv_obj->pages, npages); 23 } 24 25 int etnaviv_gem_prime_vmap(struct drm_gem_object *obj, struct dma_buf_map *map) 26 { 27 void *vaddr; 28 29 vaddr = etnaviv_gem_vmap(obj); 30 if (!vaddr) 31 return -ENOMEM; 32 dma_buf_map_set_vaddr(map, vaddr); 33 34 return 0; 35 } 36 37 int etnaviv_gem_prime_mmap(struct drm_gem_object *obj, 38 struct vm_area_struct *vma) 39 { 40 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 41 int ret; 42 43 ret = drm_gem_mmap_obj(obj, obj->size, vma); 44 if (ret < 0) 45 return ret; 46 47 return etnaviv_obj->ops->mmap(etnaviv_obj, vma); 48 } 49 50 int etnaviv_gem_prime_pin(struct drm_gem_object *obj) 51 { 52 if (!obj->import_attach) { 53 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 54 55 mutex_lock(&etnaviv_obj->lock); 56 etnaviv_gem_get_pages(etnaviv_obj); 57 mutex_unlock(&etnaviv_obj->lock); 58 } 59 return 0; 60 } 61 62 void etnaviv_gem_prime_unpin(struct drm_gem_object *obj) 63 { 64 if (!obj->import_attach) { 65 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 66 67 mutex_lock(&etnaviv_obj->lock); 68 etnaviv_gem_put_pages(to_etnaviv_bo(obj)); 69 mutex_unlock(&etnaviv_obj->lock); 70 } 71 } 72 73 static void etnaviv_gem_prime_release(struct etnaviv_gem_object *etnaviv_obj) 74 { 75 struct dma_buf_map map = DMA_BUF_MAP_INIT_VADDR(etnaviv_obj->vaddr); 76 77 if (etnaviv_obj->vaddr) 78 dma_buf_vunmap(etnaviv_obj->base.import_attach->dmabuf, &map); 79 80 /* Don't drop the pages for imported dmabuf, as they are not 81 * ours, just free the array we allocated: 82 */ 83 kvfree(etnaviv_obj->pages); 84 85 drm_prime_gem_destroy(&etnaviv_obj->base, etnaviv_obj->sgt); 86 } 87 88 static void *etnaviv_gem_prime_vmap_impl(struct etnaviv_gem_object *etnaviv_obj) 89 { 90 struct dma_buf_map map; 91 int ret; 92 93 lockdep_assert_held(&etnaviv_obj->lock); 94 95 ret = dma_buf_vmap(etnaviv_obj->base.import_attach->dmabuf, &map); 96 if (ret) 97 return NULL; 98 return map.vaddr; 99 } 100 101 static int etnaviv_gem_prime_mmap_obj(struct etnaviv_gem_object *etnaviv_obj, 102 struct vm_area_struct *vma) 103 { 104 return dma_buf_mmap(etnaviv_obj->base.dma_buf, vma, 0); 105 } 106 107 static const struct etnaviv_gem_ops etnaviv_gem_prime_ops = { 108 /* .get_pages should never be called */ 109 .release = etnaviv_gem_prime_release, 110 .vmap = etnaviv_gem_prime_vmap_impl, 111 .mmap = etnaviv_gem_prime_mmap_obj, 112 }; 113 114 struct drm_gem_object *etnaviv_gem_prime_import_sg_table(struct drm_device *dev, 115 struct dma_buf_attachment *attach, struct sg_table *sgt) 116 { 117 struct etnaviv_gem_object *etnaviv_obj; 118 size_t size = PAGE_ALIGN(attach->dmabuf->size); 119 int ret, npages; 120 121 ret = etnaviv_gem_new_private(dev, size, ETNA_BO_WC, 122 &etnaviv_gem_prime_ops, &etnaviv_obj); 123 if (ret < 0) 124 return ERR_PTR(ret); 125 126 lockdep_set_class(&etnaviv_obj->lock, &etnaviv_prime_lock_class); 127 128 npages = size / PAGE_SIZE; 129 130 etnaviv_obj->sgt = sgt; 131 etnaviv_obj->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); 132 if (!etnaviv_obj->pages) { 133 ret = -ENOMEM; 134 goto fail; 135 } 136 137 ret = drm_prime_sg_to_page_array(sgt, etnaviv_obj->pages, npages); 138 if (ret) 139 goto fail; 140 141 etnaviv_gem_obj_add(dev, &etnaviv_obj->base); 142 143 return &etnaviv_obj->base; 144 145 fail: 146 drm_gem_object_put(&etnaviv_obj->base); 147 148 return ERR_PTR(ret); 149 } 150