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