drivers/gpu/drm/i915/gvt/dmabuf.c

   1 /*
   2  * Copyright 2017 Intel Corporation. All rights reserved.
   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 (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Zhiyuan Lv <zhiyuan.lv@intel.com>
  25  *
  26  * Contributors:
  27  *    Xiaoguang Chen
  28  *    Tina Zhang <tina.zhang@intel.com>
  29  */
  30
  31 #include <linux/dma-buf.h>
  32 #include <drm/drmP.h>
  33 #include <linux/vfio.h>
  34
  35 #include "i915_drv.h"
  36 #include "gvt.h"
  37
  38 #define GEN8_DECODE_PTE(pte) (pte & GENMASK_ULL(63, 12))
  39
  40 static int vgpu_gem_get_pages(
  41                 struct drm_i915_gem_object *obj)
  42 {
  43         struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
  44         struct sg_table *st;
  45         struct scatterlist *sg;
  46         int i, ret;
  47         gen8_pte_t __iomem *gtt_entries;
  48         struct intel_vgpu_fb_info *fb_info;
  49
  50         fb_info = (struct intel_vgpu_fb_info *)obj->gvt_info;
  51         if (WARN_ON(!fb_info))
  52                 return -ENODEV;
  53
  54         st = kmalloc(sizeof(*st), GFP_KERNEL);
  55         if (unlikely(!st))
  56                 return -ENOMEM;
  57
  58         ret = sg_alloc_table(st, fb_info->size, GFP_KERNEL);
  59         if (ret) {
  60                 kfree(st);
  61                 return ret;
  62         }
  63         gtt_entries = (gen8_pte_t __iomem *)dev_priv->ggtt.gsm +
  64                 (fb_info->start >> PAGE_SHIFT);
  65         for_each_sg(st->sgl, sg, fb_info->size, i) {
  66                 sg->offset = 0;
  67                 sg->length = PAGE_SIZE;
  68                 sg_dma_address(sg) =
  69                         GEN8_DECODE_PTE(readq(&gtt_entries[i]));
  70                 sg_dma_len(sg) = PAGE_SIZE;
  71         }
  72
  73         __i915_gem_object_set_pages(obj, st, PAGE_SIZE);
  74
  75         return 0;
  76 }
  77
  78 static void vgpu_gem_put_pages(struct drm_i915_gem_object *obj,
  79                 struct sg_table *pages)
  80 {
  81         sg_free_table(pages);
  82         kfree(pages);
  83 }
  84
  85 static void dmabuf_gem_object_free(struct kref *kref)
  86 {
  87         struct intel_vgpu_dmabuf_obj *obj =
  88                 container_of(kref, struct intel_vgpu_dmabuf_obj, kref);
  89         struct intel_vgpu *vgpu = obj->vgpu;
  90         struct list_head *pos;
  91         struct intel_vgpu_dmabuf_obj *dmabuf_obj;
  92
  93         if (vgpu && vgpu->active && !list_empty(&vgpu->dmabuf_obj_list_head)) {
  94                 list_for_each(pos, &vgpu->dmabuf_obj_list_head) {
  95                         dmabuf_obj = container_of(pos,
  96                                         struct intel_vgpu_dmabuf_obj, list);
  97                         if (dmabuf_obj == obj) {
  98                                 list_del(pos);
  99                                 intel_gvt_hypervisor_put_vfio_device(vgpu);
 100                                 idr_remove(&vgpu->object_idr,
 101                                            dmabuf_obj->dmabuf_id);
 102                                 kfree(dmabuf_obj->info);
 103                                 kfree(dmabuf_obj);
 104                                 break;
 105                         }
 106                 }
 107         } else {
 108                 /* Free the orphan dmabuf_objs here */
 109                 kfree(obj->info);
 110                 kfree(obj);
 111         }
 112 }
 113
 114
 115 static inline void dmabuf_obj_get(struct intel_vgpu_dmabuf_obj *obj)
 116 {
 117         kref_get(&obj->kref);
 118 }
 119
 120 static inline void dmabuf_obj_put(struct intel_vgpu_dmabuf_obj *obj)
 121 {
 122         kref_put(&obj->kref, dmabuf_gem_object_free);
 123 }
 124
 125 static void vgpu_gem_release(struct drm_i915_gem_object *gem_obj)
 126 {
 127
 128         struct intel_vgpu_fb_info *fb_info = gem_obj->gvt_info;
 129         struct intel_vgpu_dmabuf_obj *obj = fb_info->obj;
 130         struct intel_vgpu *vgpu = obj->vgpu;
 131
 132         if (vgpu) {
 133                 mutex_lock(&vgpu->dmabuf_lock);
 134                 gem_obj->base.dma_buf = NULL;
 135                 dmabuf_obj_put(obj);
 136                 mutex_unlock(&vgpu->dmabuf_lock);
 137         } else {
 138                 /* vgpu is NULL, as it has been removed already */
 139                 gem_obj->base.dma_buf = NULL;
 140                 dmabuf_obj_put(obj);
 141         }
 142 }
 143
 144 static const struct drm_i915_gem_object_ops intel_vgpu_gem_ops = {
 145         .flags = I915_GEM_OBJECT_IS_PROXY,
 146         .get_pages = vgpu_gem_get_pages,
 147         .put_pages = vgpu_gem_put_pages,
 148         .release = vgpu_gem_release,
 149 };
 150
 151 static struct drm_i915_gem_object *vgpu_create_gem(struct drm_device *dev,
 152                 struct intel_vgpu_fb_info *info)
 153 {
 154         struct drm_i915_private *dev_priv = to_i915(dev);
 155         struct drm_i915_gem_object *obj;
 156
 157         obj = i915_gem_object_alloc(dev_priv);
 158         if (obj == NULL)
 159                 return NULL;
 160
 161         drm_gem_private_object_init(dev, &obj->base,
 162                 info->size << PAGE_SHIFT);
 163         i915_gem_object_init(obj, &intel_vgpu_gem_ops);
 164
 165         obj->read_domains = I915_GEM_DOMAIN_GTT;
 166         obj->write_domain = 0;
 167         if (IS_SKYLAKE(dev_priv)
 168                 || IS_KABYLAKE(dev_priv)
 169                 || IS_BROXTON(dev_priv)) {
 170                 unsigned int tiling_mode = 0;
 171                 unsigned int stride = 0;
 172
 173                 switch (info->drm_format_mod) {
 174                 case DRM_FORMAT_MOD_LINEAR:
 175                         tiling_mode = I915_TILING_NONE;
 176                         break;
 177                 case I915_FORMAT_MOD_X_TILED:
 178                         tiling_mode = I915_TILING_X;
 179                         stride = info->stride;
 180                         break;
 181                 case I915_FORMAT_MOD_Y_TILED:
 182                 case I915_FORMAT_MOD_Yf_TILED:
 183                         tiling_mode = I915_TILING_Y;
 184                         stride = info->stride;
 185                         break;
 186                 default:
 187                         gvt_dbg_core("invalid drm_format_mod %llx for tiling\n",
 188                                      info->drm_format_mod);
 189                 }
 190                 obj->tiling_and_stride = tiling_mode | stride;
 191         } else {
 192                 obj->tiling_and_stride = info->drm_format_mod ?
 193                                         I915_TILING_X : 0;
 194         }
 195
 196         return obj;
 197 }
 198
 199 static bool validate_hotspot(struct intel_vgpu_cursor_plane_format *c)
 200 {
 201         if (c && c->x_hot <= c->width && c->y_hot <= c->height)
 202                 return true;
 203         else
 204                 return false;
 205 }
 206
 207 static int vgpu_get_plane_info(struct drm_device *dev,
 208                 struct intel_vgpu *vgpu,
 209                 struct intel_vgpu_fb_info *info,
 210                 int plane_id)
 211 {
 212         struct drm_i915_private *dev_priv = to_i915(dev);
 213         struct intel_vgpu_primary_plane_format p;
 214         struct intel_vgpu_cursor_plane_format c;
 215         int ret;
 216
 217         if (plane_id == DRM_PLANE_TYPE_PRIMARY) {
 218                 ret = intel_vgpu_decode_primary_plane(vgpu, &p);
 219                 if (ret)
 220                         return ret;
 221                 info->start = p.base;
 222                 info->start_gpa = p.base_gpa;
 223                 info->width = p.width;
 224                 info->height = p.height;
 225                 info->stride = p.stride;
 226                 info->drm_format = p.drm_format;
 227
 228                 switch (p.tiled) {
 229                 case PLANE_CTL_TILED_LINEAR:
 230                         info->drm_format_mod = DRM_FORMAT_MOD_LINEAR;
 231                         break;
 232                 case PLANE_CTL_TILED_X:
 233                         info->drm_format_mod = I915_FORMAT_MOD_X_TILED;
 234                         break;
 235                 case PLANE_CTL_TILED_Y:
 236                         info->drm_format_mod = I915_FORMAT_MOD_Y_TILED;
 237                         break;
 238                 case PLANE_CTL_TILED_YF:
 239                         info->drm_format_mod = I915_FORMAT_MOD_Yf_TILED;
 240                         break;
 241                 default:
 242                         gvt_vgpu_err("invalid tiling mode: %x\n", p.tiled);
 243                 }
 244
 245                 info->size = (((p.stride * p.height * p.bpp) / 8) +
 246                               (PAGE_SIZE - 1)) >> PAGE_SHIFT;
 247         } else if (plane_id == DRM_PLANE_TYPE_CURSOR) {
 248                 ret = intel_vgpu_decode_cursor_plane(vgpu, &c);
 249                 if (ret)
 250                         return ret;
 251                 info->start = c.base;
 252                 info->start_gpa = c.base_gpa;
 253                 info->width = c.width;
 254                 info->height = c.height;
 255                 info->stride = c.width * (c.bpp / 8);
 256                 info->drm_format = c.drm_format;
 257                 info->drm_format_mod = 0;
 258                 info->x_pos = c.x_pos;
 259                 info->y_pos = c.y_pos;
 260
 261                 if (validate_hotspot(&c)) {
 262                         info->x_hot = c.x_hot;
 263                         info->y_hot = c.y_hot;
 264                 } else {
 265                         info->x_hot = UINT_MAX;
 266                         info->y_hot = UINT_MAX;
 267                 }
 268
 269                 info->size = (((info->stride * c.height * c.bpp) / 8)
 270                                 + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
 271         } else {
 272                 gvt_vgpu_err("invalid plane id:%d\n", plane_id);
 273                 return -EINVAL;
 274         }
 275
 276         if (info->size == 0) {
 277                 gvt_vgpu_err("fb size is zero\n");
 278                 return -EINVAL;
 279         }
 280
 281         if (info->start & (PAGE_SIZE - 1)) {
 282                 gvt_vgpu_err("Not aligned fb address:0x%llx\n", info->start);
 283                 return -EFAULT;
 284         }
 285         if (((info->start >> PAGE_SHIFT) + info->size) >
 286                 ggtt_total_entries(&dev_priv->ggtt)) {
 287                 gvt_vgpu_err("Invalid GTT offset or size\n");
 288                 return -EFAULT;
 289         }
 290
 291         if (!intel_gvt_ggtt_validate_range(vgpu, info->start, info->size)) {
 292                 gvt_vgpu_err("invalid gma addr\n");
 293                 return -EFAULT;
 294         }
 295
 296         return 0;
 297 }
 298
 299 static struct intel_vgpu_dmabuf_obj *
 300 pick_dmabuf_by_info(struct intel_vgpu *vgpu,
 301                     struct intel_vgpu_fb_info *latest_info)
 302 {
 303         struct list_head *pos;
 304         struct intel_vgpu_fb_info *fb_info;
 305         struct intel_vgpu_dmabuf_obj *dmabuf_obj = NULL;
 306         struct intel_vgpu_dmabuf_obj *ret = NULL;
 307
 308         list_for_each(pos, &vgpu->dmabuf_obj_list_head) {
 309                 dmabuf_obj = container_of(pos, struct intel_vgpu_dmabuf_obj,
 310                                                 list);
 311                 if ((dmabuf_obj == NULL) ||
 312                     (dmabuf_obj->info == NULL))
 313                         continue;
 314
 315                 fb_info = (struct intel_vgpu_fb_info *)dmabuf_obj->info;
 316                 if ((fb_info->start == latest_info->start) &&
 317                     (fb_info->start_gpa == latest_info->start_gpa) &&
 318                     (fb_info->size == latest_info->size) &&
 319                     (fb_info->drm_format_mod == latest_info->drm_format_mod) &&
 320                     (fb_info->drm_format == latest_info->drm_format) &&
 321                     (fb_info->width == latest_info->width) &&
 322                     (fb_info->height == latest_info->height)) {
 323                         ret = dmabuf_obj;
 324                         break;
 325                 }
 326         }
 327
 328         return ret;
 329 }
 330
 331 static struct intel_vgpu_dmabuf_obj *
 332 pick_dmabuf_by_num(struct intel_vgpu *vgpu, u32 id)
 333 {
 334         struct list_head *pos;
 335         struct intel_vgpu_dmabuf_obj *dmabuf_obj = NULL;
 336         struct intel_vgpu_dmabuf_obj *ret = NULL;
 337
 338         list_for_each(pos, &vgpu->dmabuf_obj_list_head) {
 339                 dmabuf_obj = container_of(pos, struct intel_vgpu_dmabuf_obj,
 340                                                 list);
 341                 if (!dmabuf_obj)
 342                         continue;
 343
 344                 if (dmabuf_obj->dmabuf_id == id) {
 345                         ret = dmabuf_obj;
 346                         break;
 347                 }
 348         }
 349
 350         return ret;
 351 }
 352
 353 static void update_fb_info(struct vfio_device_gfx_plane_info *gvt_dmabuf,
 354                       struct intel_vgpu_fb_info *fb_info)
 355 {
 356         gvt_dmabuf->drm_format = fb_info->drm_format;
 357         gvt_dmabuf->drm_format_mod = fb_info->drm_format_mod;
 358         gvt_dmabuf->width = fb_info->width;
 359         gvt_dmabuf->height = fb_info->height;
 360         gvt_dmabuf->stride = fb_info->stride;
 361         gvt_dmabuf->size = fb_info->size;
 362         gvt_dmabuf->x_pos = fb_info->x_pos;
 363         gvt_dmabuf->y_pos = fb_info->y_pos;
 364         gvt_dmabuf->x_hot = fb_info->x_hot;
 365         gvt_dmabuf->y_hot = fb_info->y_hot;
 366 }
 367
 368 int intel_vgpu_query_plane(struct intel_vgpu *vgpu, void *args)
 369 {
 370         struct drm_device *dev = &vgpu->gvt->dev_priv->drm;
 371         struct vfio_device_gfx_plane_info *gfx_plane_info = args;
 372         struct intel_vgpu_dmabuf_obj *dmabuf_obj;
 373         struct intel_vgpu_fb_info fb_info;
 374         int ret = 0;
 375
 376         if (gfx_plane_info->flags == (VFIO_GFX_PLANE_TYPE_DMABUF |
 377                                        VFIO_GFX_PLANE_TYPE_PROBE))
 378                 return ret;
 379         else if ((gfx_plane_info->flags & ~VFIO_GFX_PLANE_TYPE_DMABUF) ||
 380                         (!gfx_plane_info->flags))
 381                 return -EINVAL;
 382
 383         ret = vgpu_get_plane_info(dev, vgpu, &fb_info,
 384                                         gfx_plane_info->drm_plane_type);
 385         if (ret != 0)
 386                 goto out;
 387
 388         mutex_lock(&vgpu->dmabuf_lock);
 389         /* If exists, pick up the exposed dmabuf_obj */
 390         dmabuf_obj = pick_dmabuf_by_info(vgpu, &fb_info);
 391         if (dmabuf_obj) {
 392                 update_fb_info(gfx_plane_info, &fb_info);
 393                 gfx_plane_info->dmabuf_id = dmabuf_obj->dmabuf_id;
 394
 395                 /* This buffer may be released between query_plane ioctl and
 396                  * get_dmabuf ioctl. Add the refcount to make sure it won't
 397                  * be released between the two ioctls.
 398                  */
 399                 if (!dmabuf_obj->initref) {
 400                         dmabuf_obj->initref = true;
 401                         dmabuf_obj_get(dmabuf_obj);
 402                 }
 403                 ret = 0;
 404                 gvt_dbg_dpy("vgpu%d: re-use dmabuf_obj ref %d, id %d\n",
 405                             vgpu->id, kref_read(&dmabuf_obj->kref),
 406                             gfx_plane_info->dmabuf_id);
 407                 mutex_unlock(&vgpu->dmabuf_lock);
 408                 goto out;
 409         }
 410
 411         mutex_unlock(&vgpu->dmabuf_lock);
 412
 413         /* Need to allocate a new one*/
 414         dmabuf_obj = kmalloc(sizeof(struct intel_vgpu_dmabuf_obj), GFP_KERNEL);
 415         if (unlikely(!dmabuf_obj)) {
 416                 gvt_vgpu_err("alloc dmabuf_obj failed\n");
 417                 ret = -ENOMEM;
 418                 goto out;
 419         }
 420
 421         dmabuf_obj->info = kmalloc(sizeof(struct intel_vgpu_fb_info),
 422                                    GFP_KERNEL);
 423         if (unlikely(!dmabuf_obj->info)) {
 424                 gvt_vgpu_err("allocate intel vgpu fb info failed\n");
 425                 ret = -ENOMEM;
 426                 goto out_free_dmabuf;
 427         }
 428         memcpy(dmabuf_obj->info, &fb_info, sizeof(struct intel_vgpu_fb_info));
 429
 430         ((struct intel_vgpu_fb_info *)dmabuf_obj->info)->obj = dmabuf_obj;
 431
 432         dmabuf_obj->vgpu = vgpu;
 433
 434         ret = idr_alloc(&vgpu->object_idr, dmabuf_obj, 1, 0, GFP_NOWAIT);
 435         if (ret < 0)
 436                 goto out_free_info;
 437         gfx_plane_info->dmabuf_id = ret;
 438         dmabuf_obj->dmabuf_id = ret;
 439
 440         dmabuf_obj->initref = true;
 441
 442         kref_init(&dmabuf_obj->kref);
 443
 444         mutex_lock(&vgpu->dmabuf_lock);
 445         if (intel_gvt_hypervisor_get_vfio_device(vgpu)) {
 446                 gvt_vgpu_err("get vfio device failed\n");
 447                 mutex_unlock(&vgpu->dmabuf_lock);
 448                 goto out_free_info;
 449         }
 450         mutex_unlock(&vgpu->dmabuf_lock);
 451
 452         update_fb_info(gfx_plane_info, &fb_info);
 453
 454         INIT_LIST_HEAD(&dmabuf_obj->list);
 455         mutex_lock(&vgpu->dmabuf_lock);
 456         list_add_tail(&dmabuf_obj->list, &vgpu->dmabuf_obj_list_head);
 457         mutex_unlock(&vgpu->dmabuf_lock);
 458
 459         gvt_dbg_dpy("vgpu%d: %s new dmabuf_obj ref %d, id %d\n", vgpu->id,
 460                     __func__, kref_read(&dmabuf_obj->kref), ret);
 461
 462         return 0;
 463
 464 out_free_info:
 465         kfree(dmabuf_obj->info);
 466 out_free_dmabuf:
 467         kfree(dmabuf_obj);
 468 out:
 469         /* ENODEV means plane isn't ready, which might be a normal case. */
 470         return (ret == -ENODEV) ? 0 : ret;
 471 }
 472
 473 /* To associate an exposed dmabuf with the dmabuf_obj */
 474 int intel_vgpu_get_dmabuf(struct intel_vgpu *vgpu, unsigned int dmabuf_id)
 475 {
 476         struct drm_device *dev = &vgpu->gvt->dev_priv->drm;
 477         struct intel_vgpu_dmabuf_obj *dmabuf_obj;
 478         struct drm_i915_gem_object *obj;
 479         struct dma_buf *dmabuf;
 480         int dmabuf_fd;
 481         int ret = 0;
 482
 483         mutex_lock(&vgpu->dmabuf_lock);
 484
 485         dmabuf_obj = pick_dmabuf_by_num(vgpu, dmabuf_id);
 486         if (dmabuf_obj == NULL) {
 487                 gvt_vgpu_err("invalid dmabuf id:%d\n", dmabuf_id);
 488                 ret = -EINVAL;
 489                 goto out;
 490         }
 491
 492         obj = vgpu_create_gem(dev, dmabuf_obj->info);
 493         if (obj == NULL) {
 494                 gvt_vgpu_err("create gvt gem obj failed\n");
 495                 ret = -ENOMEM;
 496                 goto out;
 497         }
 498
 499         obj->gvt_info = dmabuf_obj->info;
 500
 501         dmabuf = i915_gem_prime_export(dev, &obj->base, DRM_CLOEXEC | DRM_RDWR);
 502         if (IS_ERR(dmabuf)) {
 503                 gvt_vgpu_err("export dma-buf failed\n");
 504                 ret = PTR_ERR(dmabuf);
 505                 goto out_free_gem;
 506         }
 507
 508         i915_gem_object_put(obj);
 509
 510         ret = dma_buf_fd(dmabuf, DRM_CLOEXEC | DRM_RDWR);
 511         if (ret < 0) {
 512                 gvt_vgpu_err("create dma-buf fd failed ret:%d\n", ret);
 513                 goto out_free_dmabuf;
 514         }
 515         dmabuf_fd = ret;
 516
 517         dmabuf_obj_get(dmabuf_obj);
 518
 519         if (dmabuf_obj->initref) {
 520                 dmabuf_obj->initref = false;
 521                 dmabuf_obj_put(dmabuf_obj);
 522         }
 523
 524         mutex_unlock(&vgpu->dmabuf_lock);
 525
 526         gvt_dbg_dpy("vgpu%d: dmabuf:%d, dmabuf ref %d, fd:%d\n"
 527                     "        file count: %ld, GEM ref: %d\n",
 528                     vgpu->id, dmabuf_obj->dmabuf_id,
 529                     kref_read(&dmabuf_obj->kref),
 530                     dmabuf_fd,
 531                     file_count(dmabuf->file),
 532                     kref_read(&obj->base.refcount));
 533
 534         return dmabuf_fd;
 535
 536 out_free_dmabuf:
 537         dma_buf_put(dmabuf);
 538 out_free_gem:
 539         i915_gem_object_put(obj);
 540 out:
 541         mutex_unlock(&vgpu->dmabuf_lock);
 542         return ret;
 543 }
 544
 545 void intel_vgpu_dmabuf_cleanup(struct intel_vgpu *vgpu)
 546 {
 547         struct list_head *pos, *n;
 548         struct intel_vgpu_dmabuf_obj *dmabuf_obj;
 549
 550         mutex_lock(&vgpu->dmabuf_lock);
 551         list_for_each_safe(pos, n, &vgpu->dmabuf_obj_list_head) {
 552                 dmabuf_obj = container_of(pos, struct intel_vgpu_dmabuf_obj,
 553                                                 list);
 554                 dmabuf_obj->vgpu = NULL;
 555
 556                 idr_remove(&vgpu->object_idr, dmabuf_obj->dmabuf_id);
 557                 intel_gvt_hypervisor_put_vfio_device(vgpu);
 558                 list_del(pos);
 559
 560                 /* dmabuf_obj might be freed in dmabuf_obj_put */
 561                 if (dmabuf_obj->initref) {
 562                         dmabuf_obj->initref = false;
 563                         dmabuf_obj_put(dmabuf_obj);
 564                 }
 565
 566         }
 567         mutex_unlock(&vgpu->dmabuf_lock);
 568 }