1 // SPDX-License-Identifier: GPL-2.0 2 #include "virtgpu_drv.h" 3 4 #include <linux/dma-mapping.h> 5 6 static void virtio_gpu_vram_free(struct drm_gem_object *obj) 7 { 8 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj); 9 struct virtio_gpu_device *vgdev = obj->dev->dev_private; 10 struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo); 11 bool unmap; 12 13 if (bo->created) { 14 spin_lock(&vgdev->host_visible_lock); 15 unmap = drm_mm_node_allocated(&vram->vram_node); 16 spin_unlock(&vgdev->host_visible_lock); 17 18 if (unmap) 19 virtio_gpu_cmd_unmap(vgdev, bo); 20 21 virtio_gpu_cmd_unref_resource(vgdev, bo); 22 virtio_gpu_notify(vgdev); 23 return; 24 } 25 } 26 27 static const struct vm_operations_struct virtio_gpu_vram_vm_ops = { 28 .open = drm_gem_vm_open, 29 .close = drm_gem_vm_close, 30 }; 31 32 static int virtio_gpu_vram_mmap(struct drm_gem_object *obj, 33 struct vm_area_struct *vma) 34 { 35 int ret; 36 struct virtio_gpu_device *vgdev = obj->dev->dev_private; 37 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj); 38 struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo); 39 unsigned long vm_size = vma->vm_end - vma->vm_start; 40 41 if (!(bo->blob_flags & VIRTGPU_BLOB_FLAG_USE_MAPPABLE)) 42 return -EINVAL; 43 44 wait_event(vgdev->resp_wq, vram->map_state != STATE_INITIALIZING); 45 if (vram->map_state != STATE_OK) 46 return -EINVAL; 47 48 vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node); 49 vma->vm_flags |= VM_MIXEDMAP | VM_DONTEXPAND; 50 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); 51 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); 52 vma->vm_ops = &virtio_gpu_vram_vm_ops; 53 54 if (vram->map_info == VIRTIO_GPU_MAP_CACHE_WC) 55 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); 56 else if (vram->map_info == VIRTIO_GPU_MAP_CACHE_UNCACHED) 57 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 58 59 /* Partial mappings of GEM buffers don't happen much in practice. */ 60 if (vm_size != vram->vram_node.size) 61 return -EINVAL; 62 63 ret = io_remap_pfn_range(vma, vma->vm_start, 64 vram->vram_node.start >> PAGE_SHIFT, 65 vm_size, vma->vm_page_prot); 66 return ret; 67 } 68 69 struct sg_table *virtio_gpu_vram_map_dma_buf(struct virtio_gpu_object *bo, 70 struct device *dev, 71 enum dma_data_direction dir) 72 { 73 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private; 74 struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo); 75 struct sg_table *sgt; 76 dma_addr_t addr; 77 int ret; 78 79 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); 80 if (!sgt) 81 return ERR_PTR(-ENOMEM); 82 83 if (!(bo->blob_flags & VIRTGPU_BLOB_FLAG_USE_MAPPABLE)) { 84 // Virtio devices can access the dma-buf via its UUID. Return a stub 85 // sg_table so the dma-buf API still works. 86 if (!is_virtio_device(dev) || !vgdev->has_resource_assign_uuid) { 87 ret = -EIO; 88 goto out; 89 } 90 return sgt; 91 } 92 93 ret = sg_alloc_table(sgt, 1, GFP_KERNEL); 94 if (ret) 95 goto out; 96 97 addr = dma_map_resource(dev, vram->vram_node.start, 98 vram->vram_node.size, dir, 99 DMA_ATTR_SKIP_CPU_SYNC); 100 ret = dma_mapping_error(dev, addr); 101 if (ret) 102 goto out; 103 104 sg_set_page(sgt->sgl, NULL, vram->vram_node.size, 0); 105 sg_dma_address(sgt->sgl) = addr; 106 sg_dma_len(sgt->sgl) = vram->vram_node.size; 107 108 return sgt; 109 out: 110 sg_free_table(sgt); 111 kfree(sgt); 112 return ERR_PTR(ret); 113 } 114 115 void virtio_gpu_vram_unmap_dma_buf(struct device *dev, 116 struct sg_table *sgt, 117 enum dma_data_direction dir) 118 { 119 if (sgt->nents) { 120 dma_unmap_resource(dev, sg_dma_address(sgt->sgl), 121 sg_dma_len(sgt->sgl), dir, 122 DMA_ATTR_SKIP_CPU_SYNC); 123 } 124 sg_free_table(sgt); 125 kfree(sgt); 126 } 127 128 static const struct drm_gem_object_funcs virtio_gpu_vram_funcs = { 129 .open = virtio_gpu_gem_object_open, 130 .close = virtio_gpu_gem_object_close, 131 .free = virtio_gpu_vram_free, 132 .mmap = virtio_gpu_vram_mmap, 133 .export = virtgpu_gem_prime_export, 134 }; 135 136 bool virtio_gpu_is_vram(struct virtio_gpu_object *bo) 137 { 138 return bo->base.base.funcs == &virtio_gpu_vram_funcs; 139 } 140 141 static int virtio_gpu_vram_map(struct virtio_gpu_object *bo) 142 { 143 int ret; 144 uint64_t offset; 145 struct virtio_gpu_object_array *objs; 146 struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private; 147 struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo); 148 149 if (!vgdev->has_host_visible) 150 return -EINVAL; 151 152 spin_lock(&vgdev->host_visible_lock); 153 ret = drm_mm_insert_node(&vgdev->host_visible_mm, &vram->vram_node, 154 bo->base.base.size); 155 spin_unlock(&vgdev->host_visible_lock); 156 157 if (ret) 158 return ret; 159 160 objs = virtio_gpu_array_alloc(1); 161 if (!objs) { 162 ret = -ENOMEM; 163 goto err_remove_node; 164 } 165 166 virtio_gpu_array_add_obj(objs, &bo->base.base); 167 /*TODO: Add an error checking helper function in drm_mm.h */ 168 offset = vram->vram_node.start - vgdev->host_visible_region.addr; 169 170 ret = virtio_gpu_cmd_map(vgdev, objs, offset); 171 if (ret) { 172 virtio_gpu_array_put_free(objs); 173 goto err_remove_node; 174 } 175 176 return 0; 177 178 err_remove_node: 179 spin_lock(&vgdev->host_visible_lock); 180 drm_mm_remove_node(&vram->vram_node); 181 spin_unlock(&vgdev->host_visible_lock); 182 return ret; 183 } 184 185 int virtio_gpu_vram_create(struct virtio_gpu_device *vgdev, 186 struct virtio_gpu_object_params *params, 187 struct virtio_gpu_object **bo_ptr) 188 { 189 struct drm_gem_object *obj; 190 struct virtio_gpu_object_vram *vram; 191 int ret; 192 193 vram = kzalloc(sizeof(*vram), GFP_KERNEL); 194 if (!vram) 195 return -ENOMEM; 196 197 obj = &vram->base.base.base; 198 obj->funcs = &virtio_gpu_vram_funcs; 199 200 params->size = PAGE_ALIGN(params->size); 201 drm_gem_private_object_init(vgdev->ddev, obj, params->size); 202 203 /* Create fake offset */ 204 ret = drm_gem_create_mmap_offset(obj); 205 if (ret) { 206 kfree(vram); 207 return ret; 208 } 209 210 ret = virtio_gpu_resource_id_get(vgdev, &vram->base.hw_res_handle); 211 if (ret) { 212 kfree(vram); 213 return ret; 214 } 215 216 virtio_gpu_cmd_resource_create_blob(vgdev, &vram->base, params, NULL, 217 0); 218 if (params->blob_flags & VIRTGPU_BLOB_FLAG_USE_MAPPABLE) { 219 ret = virtio_gpu_vram_map(&vram->base); 220 if (ret) { 221 virtio_gpu_vram_free(obj); 222 return ret; 223 } 224 } 225 226 *bo_ptr = &vram->base; 227 return 0; 228 } 229