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(etnaviv_obj->pages, npages); 23 } 24 25 void *etnaviv_gem_prime_vmap(struct drm_gem_object *obj) 26 { 27 return etnaviv_gem_vmap(obj); 28 } 29 30 void etnaviv_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr) 31 { 32 /* TODO msm_gem_vunmap() */ 33 } 34 35 int etnaviv_gem_prime_mmap(struct drm_gem_object *obj, 36 struct vm_area_struct *vma) 37 { 38 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 39 int ret; 40 41 ret = drm_gem_mmap_obj(obj, obj->size, vma); 42 if (ret < 0) 43 return ret; 44 45 return etnaviv_obj->ops->mmap(etnaviv_obj, vma); 46 } 47 48 int etnaviv_gem_prime_pin(struct drm_gem_object *obj) 49 { 50 if (!obj->import_attach) { 51 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 52 53 mutex_lock(&etnaviv_obj->lock); 54 etnaviv_gem_get_pages(etnaviv_obj); 55 mutex_unlock(&etnaviv_obj->lock); 56 } 57 return 0; 58 } 59 60 void etnaviv_gem_prime_unpin(struct drm_gem_object *obj) 61 { 62 if (!obj->import_attach) { 63 struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); 64 65 mutex_lock(&etnaviv_obj->lock); 66 etnaviv_gem_put_pages(to_etnaviv_bo(obj)); 67 mutex_unlock(&etnaviv_obj->lock); 68 } 69 } 70 71 static void etnaviv_gem_prime_release(struct etnaviv_gem_object *etnaviv_obj) 72 { 73 if (etnaviv_obj->vaddr) 74 dma_buf_vunmap(etnaviv_obj->base.import_attach->dmabuf, 75 etnaviv_obj->vaddr); 76 77 /* Don't drop the pages for imported dmabuf, as they are not 78 * ours, just free the array we allocated: 79 */ 80 if (etnaviv_obj->pages) 81 kvfree(etnaviv_obj->pages); 82 83 drm_prime_gem_destroy(&etnaviv_obj->base, etnaviv_obj->sgt); 84 } 85 86 static void *etnaviv_gem_prime_vmap_impl(struct etnaviv_gem_object *etnaviv_obj) 87 { 88 lockdep_assert_held(&etnaviv_obj->lock); 89 90 return dma_buf_vmap(etnaviv_obj->base.import_attach->dmabuf); 91 } 92 93 static int etnaviv_gem_prime_mmap_obj(struct etnaviv_gem_object *etnaviv_obj, 94 struct vm_area_struct *vma) 95 { 96 return dma_buf_mmap(etnaviv_obj->base.dma_buf, vma, 0); 97 } 98 99 static const struct etnaviv_gem_ops etnaviv_gem_prime_ops = { 100 /* .get_pages should never be called */ 101 .release = etnaviv_gem_prime_release, 102 .vmap = etnaviv_gem_prime_vmap_impl, 103 .mmap = etnaviv_gem_prime_mmap_obj, 104 }; 105 106 struct drm_gem_object *etnaviv_gem_prime_import_sg_table(struct drm_device *dev, 107 struct dma_buf_attachment *attach, struct sg_table *sgt) 108 { 109 struct etnaviv_gem_object *etnaviv_obj; 110 size_t size = PAGE_ALIGN(attach->dmabuf->size); 111 int ret, npages; 112 113 ret = etnaviv_gem_new_private(dev, size, ETNA_BO_WC, 114 &etnaviv_gem_prime_ops, &etnaviv_obj); 115 if (ret < 0) 116 return ERR_PTR(ret); 117 118 lockdep_set_class(&etnaviv_obj->lock, &etnaviv_prime_lock_class); 119 120 npages = size / PAGE_SIZE; 121 122 etnaviv_obj->sgt = sgt; 123 etnaviv_obj->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); 124 if (!etnaviv_obj->pages) { 125 ret = -ENOMEM; 126 goto fail; 127 } 128 129 ret = drm_prime_sg_to_page_addr_arrays(sgt, etnaviv_obj->pages, 130 NULL, npages); 131 if (ret) 132 goto fail; 133 134 etnaviv_gem_obj_add(dev, &etnaviv_obj->base); 135 136 return &etnaviv_obj->base; 137 138 fail: 139 drm_gem_object_put(&etnaviv_obj->base); 140 141 return ERR_PTR(ret); 142 } 143