drivers/gpu/drm/virtio/virtgpu_ioctl.c

   1 /*
   2  * Copyright (C) 2015 Red Hat, Inc.
   3  * All Rights Reserved.
   4  *
   5  * Authors:
   6  *    Dave Airlie
   7  *    Alon Levy
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  23  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  24  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  25  * OTHER DEALINGS IN THE SOFTWARE.
  26  */
  27
  28 #include <linux/file.h>
  29 #include <linux/sync_file.h>
  30 #include <linux/uaccess.h>
  31
  32 #include <drm/drm_file.h>
  33 #include <drm/virtgpu_drm.h>
  34
  35 #include "virtgpu_drv.h"
  36
  37 static void virtio_gpu_create_context(struct drm_device *dev,
  38                                       struct drm_file *file)
  39 {
  40         struct virtio_gpu_device *vgdev = dev->dev_private;
  41         struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
  42         char dbgname[TASK_COMM_LEN];
  43
  44         mutex_lock(&vfpriv->context_lock);
  45         if (vfpriv->context_created)
  46                 goto out_unlock;
  47
  48         get_task_comm(dbgname, current);
  49         virtio_gpu_cmd_context_create(vgdev, vfpriv->ctx_id,
  50                                       strlen(dbgname), dbgname);
  51         virtio_gpu_notify(vgdev);
  52         vfpriv->context_created = true;
  53
  54 out_unlock:
  55         mutex_unlock(&vfpriv->context_lock);
  56 }
  57
  58 static int virtio_gpu_map_ioctl(struct drm_device *dev, void *data,
  59                                 struct drm_file *file)
  60 {
  61         struct virtio_gpu_device *vgdev = dev->dev_private;
  62         struct drm_virtgpu_map *virtio_gpu_map = data;
  63
  64         return virtio_gpu_mode_dumb_mmap(file, vgdev->ddev,
  65                                          virtio_gpu_map->handle,
  66                                          &virtio_gpu_map->offset);
  67 }
  68
  69 /*
  70  * Usage of execbuffer:
  71  * Relocations need to take into account the full VIRTIO_GPUDrawable size.
  72  * However, the command as passed from user space must *not* contain the initial
  73  * VIRTIO_GPUReleaseInfo struct (first XXX bytes)
  74  */
  75 static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
  76                                  struct drm_file *file)
  77 {
  78         struct drm_virtgpu_execbuffer *exbuf = data;
  79         struct virtio_gpu_device *vgdev = dev->dev_private;
  80         struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
  81         struct virtio_gpu_fence *out_fence;
  82         int ret;
  83         uint32_t *bo_handles = NULL;
  84         void __user *user_bo_handles = NULL;
  85         struct virtio_gpu_object_array *buflist = NULL;
  86         struct sync_file *sync_file;
  87         int in_fence_fd = exbuf->fence_fd;
  88         int out_fence_fd = -1;
  89         void *buf;
  90
  91         if (vgdev->has_virgl_3d == false)
  92                 return -ENOSYS;
  93
  94         if ((exbuf->flags & ~VIRTGPU_EXECBUF_FLAGS))
  95                 return -EINVAL;
  96
  97         exbuf->fence_fd = -1;
  98
  99         virtio_gpu_create_context(dev, file);
 100         if (exbuf->flags & VIRTGPU_EXECBUF_FENCE_FD_IN) {
 101                 struct dma_fence *in_fence;
 102
 103                 in_fence = sync_file_get_fence(in_fence_fd);
 104
 105                 if (!in_fence)
 106                         return -EINVAL;
 107
 108                 /*
 109                  * Wait if the fence is from a foreign context, or if the fence
 110                  * array contains any fence from a foreign context.
 111                  */
 112                 ret = 0;
 113                 if (!dma_fence_match_context(in_fence, vgdev->fence_drv.context))
 114                         ret = dma_fence_wait(in_fence, true);
 115
 116                 dma_fence_put(in_fence);
 117                 if (ret)
 118                         return ret;
 119         }
 120
 121         if (exbuf->flags & VIRTGPU_EXECBUF_FENCE_FD_OUT) {
 122                 out_fence_fd = get_unused_fd_flags(O_CLOEXEC);
 123                 if (out_fence_fd < 0)
 124                         return out_fence_fd;
 125         }
 126
 127         if (exbuf->num_bo_handles) {
 128                 bo_handles = kvmalloc_array(exbuf->num_bo_handles,
 129                                             sizeof(uint32_t), GFP_KERNEL);
 130                 if (!bo_handles) {
 131                         ret = -ENOMEM;
 132                         goto out_unused_fd;
 133                 }
 134
 135                 user_bo_handles = u64_to_user_ptr(exbuf->bo_handles);
 136                 if (copy_from_user(bo_handles, user_bo_handles,
 137                                    exbuf->num_bo_handles * sizeof(uint32_t))) {
 138                         ret = -EFAULT;
 139                         goto out_unused_fd;
 140                 }
 141
 142                 buflist = virtio_gpu_array_from_handles(file, bo_handles,
 143                                                         exbuf->num_bo_handles);
 144                 if (!buflist) {
 145                         ret = -ENOENT;
 146                         goto out_unused_fd;
 147                 }
 148                 kvfree(bo_handles);
 149                 bo_handles = NULL;
 150         }
 151
 152         buf = vmemdup_user(u64_to_user_ptr(exbuf->command), exbuf->size);
 153         if (IS_ERR(buf)) {
 154                 ret = PTR_ERR(buf);
 155                 goto out_unused_fd;
 156         }
 157
 158         if (buflist) {
 159                 ret = virtio_gpu_array_lock_resv(buflist);
 160                 if (ret)
 161                         goto out_memdup;
 162         }
 163
 164         out_fence = virtio_gpu_fence_alloc(vgdev);
 165         if(!out_fence) {
 166                 ret = -ENOMEM;
 167                 goto out_unresv;
 168         }
 169
 170         if (out_fence_fd >= 0) {
 171                 sync_file = sync_file_create(&out_fence->f);
 172                 if (!sync_file) {
 173                         dma_fence_put(&out_fence->f);
 174                         ret = -ENOMEM;
 175                         goto out_memdup;
 176                 }
 177
 178                 exbuf->fence_fd = out_fence_fd;
 179                 fd_install(out_fence_fd, sync_file->file);
 180         }
 181
 182         virtio_gpu_cmd_submit(vgdev, buf, exbuf->size,
 183                               vfpriv->ctx_id, buflist, out_fence);
 184         virtio_gpu_notify(vgdev);
 185         return 0;
 186
 187 out_unresv:
 188         if (buflist)
 189                 virtio_gpu_array_unlock_resv(buflist);
 190 out_memdup:
 191         kvfree(buf);
 192 out_unused_fd:
 193         kvfree(bo_handles);
 194         if (buflist)
 195                 virtio_gpu_array_put_free(buflist);
 196
 197         if (out_fence_fd >= 0)
 198                 put_unused_fd(out_fence_fd);
 199
 200         return ret;
 201 }
 202
 203 static int virtio_gpu_getparam_ioctl(struct drm_device *dev, void *data,
 204                                      struct drm_file *file)
 205 {
 206         struct virtio_gpu_device *vgdev = dev->dev_private;
 207         struct drm_virtgpu_getparam *param = data;
 208         int value;
 209
 210         switch (param->param) {
 211         case VIRTGPU_PARAM_3D_FEATURES:
 212                 value = vgdev->has_virgl_3d == true ? 1 : 0;
 213                 break;
 214         case VIRTGPU_PARAM_CAPSET_QUERY_FIX:
 215                 value = 1;
 216                 break;
 217         default:
 218                 return -EINVAL;
 219         }
 220         if (copy_to_user(u64_to_user_ptr(param->value), &value, sizeof(int)))
 221                 return -EFAULT;
 222
 223         return 0;
 224 }
 225
 226 static int virtio_gpu_resource_create_ioctl(struct drm_device *dev, void *data,
 227                                             struct drm_file *file)
 228 {
 229         struct virtio_gpu_device *vgdev = dev->dev_private;
 230         struct drm_virtgpu_resource_create *rc = data;
 231         struct virtio_gpu_fence *fence;
 232         int ret;
 233         struct virtio_gpu_object *qobj;
 234         struct drm_gem_object *obj;
 235         uint32_t handle = 0;
 236         struct virtio_gpu_object_params params = { 0 };
 237
 238         if (vgdev->has_virgl_3d) {
 239                 virtio_gpu_create_context(dev, file);
 240                 params.virgl = true;
 241                 params.target = rc->target;
 242                 params.bind = rc->bind;
 243                 params.depth = rc->depth;
 244                 params.array_size = rc->array_size;
 245                 params.last_level = rc->last_level;
 246                 params.nr_samples = rc->nr_samples;
 247                 params.flags = rc->flags;
 248         } else {
 249                 if (rc->depth > 1)
 250                         return -EINVAL;
 251                 if (rc->nr_samples > 1)
 252                         return -EINVAL;
 253                 if (rc->last_level > 1)
 254                         return -EINVAL;
 255                 if (rc->target != 2)
 256                         return -EINVAL;
 257                 if (rc->array_size > 1)
 258                         return -EINVAL;
 259         }
 260
 261         params.format = rc->format;
 262         params.width = rc->width;
 263         params.height = rc->height;
 264         params.size = rc->size;
 265         /* allocate a single page size object */
 266         if (params.size == 0)
 267                 params.size = PAGE_SIZE;
 268
 269         fence = virtio_gpu_fence_alloc(vgdev);
 270         if (!fence)
 271                 return -ENOMEM;
 272         ret = virtio_gpu_object_create(vgdev, &params, &qobj, fence);
 273         dma_fence_put(&fence->f);
 274         if (ret < 0)
 275                 return ret;
 276         obj = &qobj->base.base;
 277
 278         ret = drm_gem_handle_create(file, obj, &handle);
 279         if (ret) {
 280                 drm_gem_object_release(obj);
 281                 return ret;
 282         }
 283         drm_gem_object_put_unlocked(obj);
 284
 285         rc->res_handle = qobj->hw_res_handle; /* similiar to a VM address */
 286         rc->bo_handle = handle;
 287         return 0;
 288 }
 289
 290 static int virtio_gpu_resource_info_ioctl(struct drm_device *dev, void *data,
 291                                           struct drm_file *file)
 292 {
 293         struct drm_virtgpu_resource_info *ri = data;
 294         struct drm_gem_object *gobj = NULL;
 295         struct virtio_gpu_object *qobj = NULL;
 296
 297         gobj = drm_gem_object_lookup(file, ri->bo_handle);
 298         if (gobj == NULL)
 299                 return -ENOENT;
 300
 301         qobj = gem_to_virtio_gpu_obj(gobj);
 302
 303         ri->size = qobj->base.base.size;
 304         ri->res_handle = qobj->hw_res_handle;
 305         drm_gem_object_put_unlocked(gobj);
 306         return 0;
 307 }
 308
 309 static int virtio_gpu_transfer_from_host_ioctl(struct drm_device *dev,
 310                                                void *data,
 311                                                struct drm_file *file)
 312 {
 313         struct virtio_gpu_device *vgdev = dev->dev_private;
 314         struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
 315         struct drm_virtgpu_3d_transfer_from_host *args = data;
 316         struct virtio_gpu_object_array *objs;
 317         struct virtio_gpu_fence *fence;
 318         int ret;
 319         u32 offset = args->offset;
 320
 321         if (vgdev->has_virgl_3d == false)
 322                 return -ENOSYS;
 323
 324         virtio_gpu_create_context(dev, file);
 325         objs = virtio_gpu_array_from_handles(file, &args->bo_handle, 1);
 326         if (objs == NULL)
 327                 return -ENOENT;
 328
 329         ret = virtio_gpu_array_lock_resv(objs);
 330         if (ret != 0)
 331                 goto err_put_free;
 332
 333         fence = virtio_gpu_fence_alloc(vgdev);
 334         if (!fence) {
 335                 ret = -ENOMEM;
 336                 goto err_unlock;
 337         }
 338         virtio_gpu_cmd_transfer_from_host_3d
 339                 (vgdev, vfpriv->ctx_id, offset, args->level,
 340                  &args->box, objs, fence);
 341         dma_fence_put(&fence->f);
 342         virtio_gpu_notify(vgdev);
 343         return 0;
 344
 345 err_unlock:
 346         virtio_gpu_array_unlock_resv(objs);
 347 err_put_free:
 348         virtio_gpu_array_put_free(objs);
 349         return ret;
 350 }
 351
 352 static int virtio_gpu_transfer_to_host_ioctl(struct drm_device *dev, void *data,
 353                                              struct drm_file *file)
 354 {
 355         struct virtio_gpu_device *vgdev = dev->dev_private;
 356         struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
 357         struct drm_virtgpu_3d_transfer_to_host *args = data;
 358         struct virtio_gpu_object_array *objs;
 359         struct virtio_gpu_fence *fence;
 360         int ret;
 361         u32 offset = args->offset;
 362
 363         objs = virtio_gpu_array_from_handles(file, &args->bo_handle, 1);
 364         if (objs == NULL)
 365                 return -ENOENT;
 366
 367         if (!vgdev->has_virgl_3d) {
 368                 virtio_gpu_cmd_transfer_to_host_2d
 369                         (vgdev, offset,
 370                          args->box.w, args->box.h, args->box.x, args->box.y,
 371                          objs, NULL);
 372         } else {
 373                 virtio_gpu_create_context(dev, file);
 374                 ret = virtio_gpu_array_lock_resv(objs);
 375                 if (ret != 0)
 376                         goto err_put_free;
 377
 378                 ret = -ENOMEM;
 379                 fence = virtio_gpu_fence_alloc(vgdev);
 380                 if (!fence)
 381                         goto err_unlock;
 382
 383                 virtio_gpu_cmd_transfer_to_host_3d
 384                         (vgdev,
 385                          vfpriv ? vfpriv->ctx_id : 0, offset,
 386                          args->level, &args->box, objs, fence);
 387                 dma_fence_put(&fence->f);
 388         }
 389         virtio_gpu_notify(vgdev);
 390         return 0;
 391
 392 err_unlock:
 393         virtio_gpu_array_unlock_resv(objs);
 394 err_put_free:
 395         virtio_gpu_array_put_free(objs);
 396         return ret;
 397 }
 398
 399 static int virtio_gpu_wait_ioctl(struct drm_device *dev, void *data,
 400                                  struct drm_file *file)
 401 {
 402         struct drm_virtgpu_3d_wait *args = data;
 403         struct drm_gem_object *obj;
 404         long timeout = 15 * HZ;
 405         int ret;
 406
 407         obj = drm_gem_object_lookup(file, args->handle);
 408         if (obj == NULL)
 409                 return -ENOENT;
 410
 411         if (args->flags & VIRTGPU_WAIT_NOWAIT) {
 412                 ret = dma_resv_test_signaled_rcu(obj->resv, true);
 413         } else {
 414                 ret = dma_resv_wait_timeout_rcu(obj->resv, true, true,
 415                                                 timeout);
 416         }
 417         if (ret == 0)
 418                 ret = -EBUSY;
 419         else if (ret > 0)
 420                 ret = 0;
 421
 422         drm_gem_object_put_unlocked(obj);
 423         return ret;
 424 }
 425
 426 static int virtio_gpu_get_caps_ioctl(struct drm_device *dev,
 427                                 void *data, struct drm_file *file)
 428 {
 429         struct virtio_gpu_device *vgdev = dev->dev_private;
 430         struct drm_virtgpu_get_caps *args = data;
 431         unsigned size, host_caps_size;
 432         int i;
 433         int found_valid = -1;
 434         int ret;
 435         struct virtio_gpu_drv_cap_cache *cache_ent;
 436         void *ptr;
 437
 438         if (vgdev->num_capsets == 0)
 439                 return -ENOSYS;
 440
 441         /* don't allow userspace to pass 0 */
 442         if (args->size == 0)
 443                 return -EINVAL;
 444
 445         spin_lock(&vgdev->display_info_lock);
 446         for (i = 0; i < vgdev->num_capsets; i++) {
 447                 if (vgdev->capsets[i].id == args->cap_set_id) {
 448                         if (vgdev->capsets[i].max_version >= args->cap_set_ver) {
 449                                 found_valid = i;
 450                                 break;
 451                         }
 452                 }
 453         }
 454
 455         if (found_valid == -1) {
 456                 spin_unlock(&vgdev->display_info_lock);
 457                 return -EINVAL;
 458         }
 459
 460         host_caps_size = vgdev->capsets[found_valid].max_size;
 461         /* only copy to user the minimum of the host caps size or the guest caps size */
 462         size = min(args->size, host_caps_size);
 463
 464         list_for_each_entry(cache_ent, &vgdev->cap_cache, head) {
 465                 if (cache_ent->id == args->cap_set_id &&
 466                     cache_ent->version == args->cap_set_ver) {
 467                         spin_unlock(&vgdev->display_info_lock);
 468                         goto copy_exit;
 469                 }
 470         }
 471         spin_unlock(&vgdev->display_info_lock);
 472
 473         /* not in cache - need to talk to hw */
 474         virtio_gpu_cmd_get_capset(vgdev, found_valid, args->cap_set_ver,
 475                                   &cache_ent);
 476         virtio_gpu_notify(vgdev);
 477
 478 copy_exit:
 479         ret = wait_event_timeout(vgdev->resp_wq,
 480                                  atomic_read(&cache_ent->is_valid), 5 * HZ);
 481         if (!ret)
 482                 return -EBUSY;
 483
 484         /* is_valid check must proceed before copy of the cache entry. */
 485         smp_rmb();
 486
 487         ptr = cache_ent->caps_cache;
 488
 489         if (copy_to_user(u64_to_user_ptr(args->addr), ptr, size))
 490                 return -EFAULT;
 491
 492         return 0;
 493 }
 494
 495 struct drm_ioctl_desc virtio_gpu_ioctls[DRM_VIRTIO_NUM_IOCTLS] = {
 496         DRM_IOCTL_DEF_DRV(VIRTGPU_MAP, virtio_gpu_map_ioctl,
 497                           DRM_RENDER_ALLOW),
 498
 499         DRM_IOCTL_DEF_DRV(VIRTGPU_EXECBUFFER, virtio_gpu_execbuffer_ioctl,
 500                           DRM_RENDER_ALLOW),
 501
 502         DRM_IOCTL_DEF_DRV(VIRTGPU_GETPARAM, virtio_gpu_getparam_ioctl,
 503                           DRM_RENDER_ALLOW),
 504
 505         DRM_IOCTL_DEF_DRV(VIRTGPU_RESOURCE_CREATE,
 506                           virtio_gpu_resource_create_ioctl,
 507                           DRM_RENDER_ALLOW),
 508
 509         DRM_IOCTL_DEF_DRV(VIRTGPU_RESOURCE_INFO, virtio_gpu_resource_info_ioctl,
 510                           DRM_RENDER_ALLOW),
 511
 512         /* make transfer async to the main ring? - no sure, can we
 513          * thread these in the underlying GL
 514          */
 515         DRM_IOCTL_DEF_DRV(VIRTGPU_TRANSFER_FROM_HOST,
 516                           virtio_gpu_transfer_from_host_ioctl,
 517                           DRM_RENDER_ALLOW),
 518         DRM_IOCTL_DEF_DRV(VIRTGPU_TRANSFER_TO_HOST,
 519                           virtio_gpu_transfer_to_host_ioctl,
 520                           DRM_RENDER_ALLOW),
 521
 522         DRM_IOCTL_DEF_DRV(VIRTGPU_WAIT, virtio_gpu_wait_ioctl,
 523                           DRM_RENDER_ALLOW),
 524
 525         DRM_IOCTL_DEF_DRV(VIRTGPU_GET_CAPS, virtio_gpu_get_caps_ioctl,
 526                           DRM_RENDER_ALLOW),
 527 };