1 /* 2 * Copyright 2014 Canonical 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * Authors: Andreas Pokorny 23 */ 24 25 #include <drm/drm_prime.h> 26 #include <linux/virtio_dma_buf.h> 27 28 #include "virtgpu_drv.h" 29 30 MODULE_IMPORT_NS("DMA_BUF"); 31 32 static int virtgpu_virtio_get_uuid(struct dma_buf *buf, 33 uuid_t *uuid) 34 { 35 struct drm_gem_object *obj = buf->priv; 36 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj); 37 struct virtio_gpu_device *vgdev = obj->dev->dev_private; 38 39 wait_event(vgdev->resp_wq, bo->uuid_state != STATE_INITIALIZING); 40 if (bo->uuid_state != STATE_OK) 41 return -ENODEV; 42 43 uuid_copy(uuid, &bo->uuid); 44 45 return 0; 46 } 47 48 static struct sg_table * 49 virtgpu_gem_map_dma_buf(struct dma_buf_attachment *attach, 50 enum dma_data_direction dir) 51 { 52 struct drm_gem_object *obj = attach->dmabuf->priv; 53 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj); 54 55 if (virtio_gpu_is_vram(bo)) 56 return virtio_gpu_vram_map_dma_buf(bo, attach->dev, dir); 57 58 return drm_gem_map_dma_buf(attach, dir); 59 } 60 61 static void virtgpu_gem_unmap_dma_buf(struct dma_buf_attachment *attach, 62 struct sg_table *sgt, 63 enum dma_data_direction dir) 64 { 65 struct drm_gem_object *obj = attach->dmabuf->priv; 66 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj); 67 68 if (virtio_gpu_is_vram(bo)) { 69 virtio_gpu_vram_unmap_dma_buf(attach->dev, sgt, dir); 70 return; 71 } 72 73 drm_gem_unmap_dma_buf(attach, sgt, dir); 74 } 75 76 static const struct virtio_dma_buf_ops virtgpu_dmabuf_ops = { 77 .ops = { 78 .cache_sgt_mapping = true, 79 .attach = virtio_dma_buf_attach, 80 .detach = drm_gem_map_detach, 81 .map_dma_buf = virtgpu_gem_map_dma_buf, 82 .unmap_dma_buf = virtgpu_gem_unmap_dma_buf, 83 .release = drm_gem_dmabuf_release, 84 .mmap = drm_gem_dmabuf_mmap, 85 .vmap = drm_gem_dmabuf_vmap, 86 .vunmap = drm_gem_dmabuf_vunmap, 87 }, 88 .device_attach = drm_gem_map_attach, 89 .get_uuid = virtgpu_virtio_get_uuid, 90 }; 91 92 int virtio_gpu_resource_assign_uuid(struct virtio_gpu_device *vgdev, 93 struct virtio_gpu_object *bo) 94 { 95 struct virtio_gpu_object_array *objs; 96 97 objs = virtio_gpu_array_alloc(1); 98 if (!objs) 99 return -ENOMEM; 100 101 virtio_gpu_array_add_obj(objs, &bo->base.base); 102 103 return virtio_gpu_cmd_resource_assign_uuid(vgdev, objs); 104 } 105 106 struct dma_buf *virtgpu_gem_prime_export(struct drm_gem_object *obj, 107 int flags) 108 { 109 struct dma_buf *buf; 110 struct drm_device *dev = obj->dev; 111 struct virtio_gpu_device *vgdev = dev->dev_private; 112 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj); 113 int ret = 0; 114 bool blob = bo->host3d_blob || bo->guest_blob; 115 DEFINE_DMA_BUF_EXPORT_INFO(exp_info); 116 117 if (!blob) { 118 if (vgdev->has_resource_assign_uuid) { 119 ret = virtio_gpu_resource_assign_uuid(vgdev, bo); 120 if (ret) 121 return ERR_PTR(ret); 122 123 virtio_gpu_notify(vgdev); 124 } else { 125 bo->uuid_state = STATE_ERR; 126 } 127 } else if (!(bo->blob_flags & VIRTGPU_BLOB_FLAG_USE_CROSS_DEVICE)) { 128 bo->uuid_state = STATE_ERR; 129 } 130 131 exp_info.ops = &virtgpu_dmabuf_ops.ops; 132 exp_info.size = obj->size; 133 exp_info.flags = flags; 134 exp_info.priv = obj; 135 exp_info.resv = obj->resv; 136 137 buf = virtio_dma_buf_export(&exp_info); 138 if (IS_ERR(buf)) 139 return buf; 140 141 drm_dev_get(dev); 142 drm_gem_object_get(obj); 143 144 return buf; 145 } 146 147 int virtgpu_dma_buf_import_sgt(struct virtio_gpu_mem_entry **ents, 148 unsigned int *nents, 149 struct virtio_gpu_object *bo, 150 struct dma_buf_attachment *attach) 151 { 152 struct scatterlist *sl; 153 struct sg_table *sgt; 154 long i, ret; 155 156 dma_resv_assert_held(attach->dmabuf->resv); 157 158 ret = dma_resv_wait_timeout(attach->dmabuf->resv, 159 DMA_RESV_USAGE_KERNEL, 160 false, MAX_SCHEDULE_TIMEOUT); 161 if (ret <= 0) 162 return ret < 0 ? ret : -ETIMEDOUT; 163 164 sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); 165 if (IS_ERR(sgt)) 166 return PTR_ERR(sgt); 167 168 *ents = kvmalloc_array(sgt->nents, 169 sizeof(struct virtio_gpu_mem_entry), 170 GFP_KERNEL); 171 if (!(*ents)) { 172 dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL); 173 return -ENOMEM; 174 } 175 176 *nents = sgt->nents; 177 for_each_sgtable_dma_sg(sgt, sl, i) { 178 (*ents)[i].addr = cpu_to_le64(sg_dma_address(sl)); 179 (*ents)[i].length = cpu_to_le32(sg_dma_len(sl)); 180 (*ents)[i].padding = 0; 181 } 182 183 bo->sgt = sgt; 184 return 0; 185 } 186 187 static void virtgpu_dma_buf_free_obj(struct drm_gem_object *obj) 188 { 189 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj); 190 struct virtio_gpu_device *vgdev = obj->dev->dev_private; 191 struct dma_buf_attachment *attach = obj->import_attach; 192 193 if (attach) { 194 struct dma_buf *dmabuf = attach->dmabuf; 195 196 dma_resv_lock(dmabuf->resv, NULL); 197 198 virtio_gpu_detach_object_fenced(bo); 199 200 if (bo->sgt) 201 dma_buf_unmap_attachment(attach, bo->sgt, 202 DMA_BIDIRECTIONAL); 203 204 dma_resv_unlock(dmabuf->resv); 205 206 dma_buf_detach(dmabuf, attach); 207 dma_buf_put(dmabuf); 208 } 209 210 if (bo->created) { 211 virtio_gpu_cmd_unref_resource(vgdev, bo); 212 virtio_gpu_notify(vgdev); 213 return; 214 } 215 virtio_gpu_cleanup_object(bo); 216 } 217 218 static int virtgpu_dma_buf_init_obj(struct drm_device *dev, 219 struct virtio_gpu_object *bo, 220 struct dma_buf_attachment *attach) 221 { 222 struct virtio_gpu_device *vgdev = dev->dev_private; 223 struct virtio_gpu_object_params params = { 0 }; 224 struct dma_resv *resv = attach->dmabuf->resv; 225 struct virtio_gpu_mem_entry *ents = NULL; 226 unsigned int nents; 227 int ret; 228 229 ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle); 230 if (ret) { 231 virtgpu_dma_buf_free_obj(&bo->base.base); 232 return ret; 233 } 234 235 dma_resv_lock(resv, NULL); 236 237 ret = dma_buf_pin(attach); 238 if (ret) 239 goto err_pin; 240 241 ret = virtgpu_dma_buf_import_sgt(&ents, &nents, bo, attach); 242 if (ret) 243 goto err_import; 244 245 params.blob = true; 246 params.blob_mem = VIRTGPU_BLOB_MEM_GUEST; 247 params.blob_flags = VIRTGPU_BLOB_FLAG_USE_SHAREABLE; 248 params.size = attach->dmabuf->size; 249 250 virtio_gpu_cmd_resource_create_blob(vgdev, bo, ¶ms, 251 ents, nents); 252 bo->guest_blob = true; 253 bo->attached = true; 254 255 dma_buf_unpin(attach); 256 dma_resv_unlock(resv); 257 258 return 0; 259 260 err_import: 261 dma_buf_unpin(attach); 262 err_pin: 263 dma_resv_unlock(resv); 264 virtgpu_dma_buf_free_obj(&bo->base.base); 265 return ret; 266 } 267 268 static const struct drm_gem_object_funcs virtgpu_gem_dma_buf_funcs = { 269 .free = virtgpu_dma_buf_free_obj, 270 }; 271 272 static void virtgpu_dma_buf_move_notify(struct dma_buf_attachment *attach) 273 { 274 struct drm_gem_object *obj = attach->importer_priv; 275 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj); 276 277 if (bo->created && kref_read(&obj->refcount)) { 278 virtio_gpu_detach_object_fenced(bo); 279 280 if (bo->sgt) 281 dma_buf_unmap_attachment(attach, bo->sgt, 282 DMA_BIDIRECTIONAL); 283 284 bo->sgt = NULL; 285 } 286 } 287 288 static const struct dma_buf_attach_ops virtgpu_dma_buf_attach_ops = { 289 .allow_peer2peer = true, 290 .move_notify = virtgpu_dma_buf_move_notify 291 }; 292 293 struct drm_gem_object *virtgpu_gem_prime_import(struct drm_device *dev, 294 struct dma_buf *buf) 295 { 296 struct virtio_gpu_device *vgdev = dev->dev_private; 297 struct dma_buf_attachment *attach; 298 struct virtio_gpu_object *bo; 299 struct drm_gem_object *obj; 300 int ret; 301 302 if (buf->ops == &virtgpu_dmabuf_ops.ops) { 303 obj = buf->priv; 304 if (obj->dev == dev) { 305 /* 306 * Importing dmabuf exported from our own gem increases 307 * refcount on gem itself instead of f_count of dmabuf. 308 */ 309 drm_gem_object_get(obj); 310 return obj; 311 } 312 } 313 314 if (!vgdev->has_resource_blob || vgdev->has_virgl_3d) 315 return drm_gem_prime_import(dev, buf); 316 317 bo = kzalloc(sizeof(*bo), GFP_KERNEL); 318 if (!bo) 319 return ERR_PTR(-ENOMEM); 320 321 obj = &bo->base.base; 322 obj->funcs = &virtgpu_gem_dma_buf_funcs; 323 drm_gem_private_object_init(dev, obj, buf->size); 324 325 attach = dma_buf_dynamic_attach(buf, dev->dev, 326 &virtgpu_dma_buf_attach_ops, obj); 327 if (IS_ERR(attach)) { 328 kfree(bo); 329 return ERR_CAST(attach); 330 } 331 332 obj->import_attach = attach; 333 get_dma_buf(buf); 334 335 ret = virtgpu_dma_buf_init_obj(dev, bo, attach); 336 if (ret < 0) 337 return ERR_PTR(ret); 338 339 return obj; 340 } 341 342 struct drm_gem_object *virtgpu_gem_prime_import_sg_table( 343 struct drm_device *dev, struct dma_buf_attachment *attach, 344 struct sg_table *table) 345 { 346 return ERR_PTR(-ENODEV); 347 } 348