drivers/gpu/drm/nouveau/nouveau_display.c

   1 /*
   2  * Copyright (C) 2008 Maarten Maathuis.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining
   6  * a copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sublicense, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial
  15  * portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  20  * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  21  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  22  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  23  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  *
  25  */
  26
  27 #include "drmP.h"
  28 #include "drm_crtc_helper.h"
  29 #include "nouveau_drv.h"
  30 #include "nouveau_fb.h"
  31 #include "nouveau_fbcon.h"
  32 #include "nouveau_hw.h"
  33 #include "nouveau_crtc.h"
  34 #include "nouveau_dma.h"
  35 #include "nouveau_connector.h"
  36 #include "nouveau_gpio.h"
  37 #include "nv50_display.h"
  38
  39 static void
  40 nouveau_user_framebuffer_destroy(struct drm_framebuffer *drm_fb)
  41 {
  42         struct nouveau_framebuffer *fb = nouveau_framebuffer(drm_fb);
  43
  44         if (fb->nvbo)
  45                 drm_gem_object_unreference_unlocked(fb->nvbo->gem);
  46
  47         drm_framebuffer_cleanup(drm_fb);
  48         kfree(fb);
  49 }
  50
  51 static int
  52 nouveau_user_framebuffer_create_handle(struct drm_framebuffer *drm_fb,
  53                                        struct drm_file *file_priv,
  54                                        unsigned int *handle)
  55 {
  56         struct nouveau_framebuffer *fb = nouveau_framebuffer(drm_fb);
  57
  58         return drm_gem_handle_create(file_priv, fb->nvbo->gem, handle);
  59 }
  60
  61 static const struct drm_framebuffer_funcs nouveau_framebuffer_funcs = {
  62         .destroy = nouveau_user_framebuffer_destroy,
  63         .create_handle = nouveau_user_framebuffer_create_handle,
  64 };
  65
  66 int
  67 nouveau_framebuffer_init(struct drm_device *dev,
  68                          struct nouveau_framebuffer *nv_fb,
  69                          struct drm_mode_fb_cmd2 *mode_cmd,
  70                          struct nouveau_bo *nvbo)
  71 {
  72         struct drm_nouveau_private *dev_priv = dev->dev_private;
  73         struct drm_framebuffer *fb = &nv_fb->base;
  74         int ret;
  75
  76         ret = drm_framebuffer_init(dev, fb, &nouveau_framebuffer_funcs);
  77         if (ret) {
  78                 return ret;
  79         }
  80
  81         drm_helper_mode_fill_fb_struct(fb, mode_cmd);
  82         nv_fb->nvbo = nvbo;
  83
  84         if (dev_priv->card_type >= NV_50) {
  85                 u32 tile_flags = nouveau_bo_tile_layout(nvbo);
  86                 if (tile_flags == 0x7a00 ||
  87                     tile_flags == 0xfe00)
  88                         nv_fb->r_dma = NvEvoFB32;
  89                 else
  90                 if (tile_flags == 0x7000)
  91                         nv_fb->r_dma = NvEvoFB16;
  92                 else
  93                         nv_fb->r_dma = NvEvoVRAM_LP;
  94
  95                 switch (fb->depth) {
  96                 case  8: nv_fb->r_format = NV50_EVO_CRTC_FB_DEPTH_8; break;
  97                 case 15: nv_fb->r_format = NV50_EVO_CRTC_FB_DEPTH_15; break;
  98                 case 16: nv_fb->r_format = NV50_EVO_CRTC_FB_DEPTH_16; break;
  99                 case 24:
 100                 case 32: nv_fb->r_format = NV50_EVO_CRTC_FB_DEPTH_24; break;
 101                 case 30: nv_fb->r_format = NV50_EVO_CRTC_FB_DEPTH_30; break;
 102                 default:
 103                          NV_ERROR(dev, "unknown depth %d\n", fb->depth);
 104                          return -EINVAL;
 105                 }
 106
 107                 if (dev_priv->chipset == 0x50)
 108                         nv_fb->r_format |= (tile_flags << 8);
 109
 110                 if (!tile_flags) {
 111                         if (dev_priv->card_type < NV_D0)
 112                                 nv_fb->r_pitch = 0x00100000 | fb->pitches[0];
 113                         else
 114                                 nv_fb->r_pitch = 0x01000000 | fb->pitches[0];
 115                 } else {
 116                         u32 mode = nvbo->tile_mode;
 117                         if (dev_priv->card_type >= NV_C0)
 118                                 mode >>= 4;
 119                         nv_fb->r_pitch = ((fb->pitches[0] / 4) << 4) | mode;
 120                 }
 121         }
 122
 123         return 0;
 124 }
 125
 126 static struct drm_framebuffer *
 127 nouveau_user_framebuffer_create(struct drm_device *dev,
 128                                 struct drm_file *file_priv,
 129                                 struct drm_mode_fb_cmd2 *mode_cmd)
 130 {
 131         struct nouveau_framebuffer *nouveau_fb;
 132         struct drm_gem_object *gem;
 133         int ret;
 134
 135         gem = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[0]);
 136         if (!gem)
 137                 return ERR_PTR(-ENOENT);
 138
 139         nouveau_fb = kzalloc(sizeof(struct nouveau_framebuffer), GFP_KERNEL);
 140         if (!nouveau_fb)
 141                 return ERR_PTR(-ENOMEM);
 142
 143         ret = nouveau_framebuffer_init(dev, nouveau_fb, mode_cmd, nouveau_gem_object(gem));
 144         if (ret) {
 145                 drm_gem_object_unreference(gem);
 146                 return ERR_PTR(ret);
 147         }
 148
 149         return &nouveau_fb->base;
 150 }
 151
 152 static const struct drm_mode_config_funcs nouveau_mode_config_funcs = {
 153         .fb_create = nouveau_user_framebuffer_create,
 154         .output_poll_changed = nouveau_fbcon_output_poll_changed,
 155 };
 156
 157
 158 struct nouveau_drm_prop_enum_list {
 159         u8 gen_mask;
 160         int type;
 161         char *name;
 162 };
 163
 164 static struct nouveau_drm_prop_enum_list underscan[] = {
 165         { 6, UNDERSCAN_AUTO, "auto" },
 166         { 6, UNDERSCAN_OFF, "off" },
 167         { 6, UNDERSCAN_ON, "on" },
 168         {}
 169 };
 170
 171 static struct nouveau_drm_prop_enum_list dither_mode[] = {
 172         { 7, DITHERING_MODE_AUTO, "auto" },
 173         { 7, DITHERING_MODE_OFF, "off" },
 174         { 1, DITHERING_MODE_ON, "on" },
 175         { 6, DITHERING_MODE_STATIC2X2, "static 2x2" },
 176         { 6, DITHERING_MODE_DYNAMIC2X2, "dynamic 2x2" },
 177         { 4, DITHERING_MODE_TEMPORAL, "temporal" },
 178         {}
 179 };
 180
 181 static struct nouveau_drm_prop_enum_list dither_depth[] = {
 182         { 6, DITHERING_DEPTH_AUTO, "auto" },
 183         { 6, DITHERING_DEPTH_6BPC, "6 bpc" },
 184         { 6, DITHERING_DEPTH_8BPC, "8 bpc" },
 185         {}
 186 };
 187
 188 #define PROP_ENUM(p,gen,n,list) do {                                           \
 189         struct nouveau_drm_prop_enum_list *l = (list);                         \
 190         int c = 0;                                                             \
 191         while (l->gen_mask) {                                                  \
 192                 if (l->gen_mask & (1 << (gen)))                                \
 193                         c++;                                                   \
 194                 l++;                                                           \
 195         }                                                                      \
 196         if (c) {                                                               \
 197                 p = drm_property_create(dev, DRM_MODE_PROP_ENUM, n, c);        \
 198                 l = (list);                                                    \
 199                 c = 0;                                                         \
 200                 while (p && l->gen_mask) {                                     \
 201                         if (l->gen_mask & (1 << (gen))) {                      \
 202                                 drm_property_add_enum(p, c, l->type, l->name); \
 203                                 c++;                                           \
 204                         }                                                      \
 205                         l++;                                                   \
 206                 }                                                              \
 207         }                                                                      \
 208 } while(0)
 209
 210 int
 211 nouveau_display_init(struct drm_device *dev)
 212 {
 213         struct drm_nouveau_private *dev_priv = dev->dev_private;
 214         struct nouveau_display_engine *disp = &dev_priv->engine.display;
 215         struct drm_connector *connector;
 216         int ret;
 217
 218         ret = disp->init(dev);
 219         if (ret)
 220                 return ret;
 221
 222         /* power on internal panel if it's not already.  the init tables of
 223          * some vbios default this to off for some reason, causing the
 224          * panel to not work after resume
 225          */
 226         if (nouveau_gpio_func_get(dev, DCB_GPIO_PANEL_POWER) == 0) {
 227                 nouveau_gpio_func_set(dev, DCB_GPIO_PANEL_POWER, true);
 228                 msleep(300);
 229         }
 230
 231         /* enable polling for external displays */
 232         drm_kms_helper_poll_enable(dev);
 233
 234         /* enable hotplug interrupts */
 235         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 236                 struct nouveau_connector *conn = nouveau_connector(connector);
 237                 nouveau_gpio_irq(dev, 0, conn->hpd, 0xff, true);
 238         }
 239
 240         return ret;
 241 }
 242
 243 void
 244 nouveau_display_fini(struct drm_device *dev)
 245 {
 246         struct drm_nouveau_private *dev_priv = dev->dev_private;
 247         struct nouveau_display_engine *disp = &dev_priv->engine.display;
 248         struct drm_connector *connector;
 249
 250         /* disable hotplug interrupts */
 251         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 252                 struct nouveau_connector *conn = nouveau_connector(connector);
 253                 nouveau_gpio_irq(dev, 0, conn->hpd, 0xff, false);
 254         }
 255
 256         drm_kms_helper_poll_disable(dev);
 257         disp->fini(dev);
 258 }
 259
 260 int
 261 nouveau_display_create(struct drm_device *dev)
 262 {
 263         struct drm_nouveau_private *dev_priv = dev->dev_private;
 264         struct nouveau_display_engine *disp = &dev_priv->engine.display;
 265         int ret, gen;
 266
 267         drm_mode_config_init(dev);
 268         drm_mode_create_scaling_mode_property(dev);
 269         drm_mode_create_dvi_i_properties(dev);
 270
 271         if (dev_priv->card_type < NV_50)
 272                 gen = 0;
 273         else
 274         if (dev_priv->card_type < NV_D0)
 275                 gen = 1;
 276         else
 277                 gen = 2;
 278
 279         PROP_ENUM(disp->dithering_mode, gen, "dithering mode", dither_mode);
 280         PROP_ENUM(disp->dithering_depth, gen, "dithering depth", dither_depth);
 281         PROP_ENUM(disp->underscan_property, gen, "underscan", underscan);
 282
 283         disp->underscan_hborder_property =
 284                 drm_property_create_range(dev, 0, "underscan hborder", 0, 128);
 285
 286         disp->underscan_vborder_property =
 287                 drm_property_create_range(dev, 0, "underscan vborder", 0, 128);
 288
 289         if (gen == 1) {
 290                 disp->vibrant_hue_property =
 291                         drm_property_create(dev, DRM_MODE_PROP_RANGE,
 292                                             "vibrant hue", 2);
 293                 disp->vibrant_hue_property->values[0] = 0;
 294                 disp->vibrant_hue_property->values[1] = 180; /* -90..+90 */
 295
 296                 disp->color_vibrance_property =
 297                         drm_property_create(dev, DRM_MODE_PROP_RANGE,
 298                                             "color vibrance", 2);
 299                 disp->color_vibrance_property->values[0] = 0;
 300                 disp->color_vibrance_property->values[1] = 200; /* -100..+100 */
 301         }
 302
 303         dev->mode_config.funcs = (void *)&nouveau_mode_config_funcs;
 304         dev->mode_config.fb_base = pci_resource_start(dev->pdev, 1);
 305
 306         dev->mode_config.min_width = 0;
 307         dev->mode_config.min_height = 0;
 308         if (dev_priv->card_type < NV_10) {
 309                 dev->mode_config.max_width = 2048;
 310                 dev->mode_config.max_height = 2048;
 311         } else
 312         if (dev_priv->card_type < NV_50) {
 313                 dev->mode_config.max_width = 4096;
 314                 dev->mode_config.max_height = 4096;
 315         } else {
 316                 dev->mode_config.max_width = 8192;
 317                 dev->mode_config.max_height = 8192;
 318         }
 319
 320         dev->mode_config.preferred_depth = 24;
 321         dev->mode_config.prefer_shadow = 1;
 322
 323         drm_kms_helper_poll_init(dev);
 324         drm_kms_helper_poll_disable(dev);
 325
 326         ret = disp->create(dev);
 327         if (ret)
 328                 return ret;
 329
 330         if (dev->mode_config.num_crtc) {
 331                 ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
 332                 if (ret)
 333                         return ret;
 334         }
 335
 336         return ret;
 337 }
 338
 339 void
 340 nouveau_display_destroy(struct drm_device *dev)
 341 {
 342         struct drm_nouveau_private *dev_priv = dev->dev_private;
 343         struct nouveau_display_engine *disp = &dev_priv->engine.display;
 344
 345         drm_vblank_cleanup(dev);
 346
 347         disp->destroy(dev);
 348
 349         drm_kms_helper_poll_fini(dev);
 350         drm_mode_config_cleanup(dev);
 351 }
 352
 353 int
 354 nouveau_vblank_enable(struct drm_device *dev, int crtc)
 355 {
 356         struct drm_nouveau_private *dev_priv = dev->dev_private;
 357
 358         if (dev_priv->card_type >= NV_50)
 359                 nv_mask(dev, NV50_PDISPLAY_INTR_EN_1, 0,
 360                         NV50_PDISPLAY_INTR_EN_1_VBLANK_CRTC_(crtc));
 361         else
 362                 NVWriteCRTC(dev, crtc, NV_PCRTC_INTR_EN_0,
 363                             NV_PCRTC_INTR_0_VBLANK);
 364
 365         return 0;
 366 }
 367
 368 void
 369 nouveau_vblank_disable(struct drm_device *dev, int crtc)
 370 {
 371         struct drm_nouveau_private *dev_priv = dev->dev_private;
 372
 373         if (dev_priv->card_type >= NV_50)
 374                 nv_mask(dev, NV50_PDISPLAY_INTR_EN_1,
 375                         NV50_PDISPLAY_INTR_EN_1_VBLANK_CRTC_(crtc), 0);
 376         else
 377                 NVWriteCRTC(dev, crtc, NV_PCRTC_INTR_EN_0, 0);
 378 }
 379
 380 static int
 381 nouveau_page_flip_reserve(struct nouveau_bo *old_bo,
 382                           struct nouveau_bo *new_bo)
 383 {
 384         int ret;
 385
 386         ret = nouveau_bo_pin(new_bo, TTM_PL_FLAG_VRAM);
 387         if (ret)
 388                 return ret;
 389
 390         ret = ttm_bo_reserve(&new_bo->bo, false, false, false, 0);
 391         if (ret)
 392                 goto fail;
 393
 394         ret = ttm_bo_reserve(&old_bo->bo, false, false, false, 0);
 395         if (ret)
 396                 goto fail_unreserve;
 397
 398         return 0;
 399
 400 fail_unreserve:
 401         ttm_bo_unreserve(&new_bo->bo);
 402 fail:
 403         nouveau_bo_unpin(new_bo);
 404         return ret;
 405 }
 406
 407 static void
 408 nouveau_page_flip_unreserve(struct nouveau_bo *old_bo,
 409                             struct nouveau_bo *new_bo,
 410                             struct nouveau_fence *fence)
 411 {
 412         nouveau_bo_fence(new_bo, fence);
 413         ttm_bo_unreserve(&new_bo->bo);
 414
 415         nouveau_bo_fence(old_bo, fence);
 416         ttm_bo_unreserve(&old_bo->bo);
 417
 418         nouveau_bo_unpin(old_bo);
 419 }
 420
 421 static int
 422 nouveau_page_flip_emit(struct nouveau_channel *chan,
 423                        struct nouveau_bo *old_bo,
 424                        struct nouveau_bo *new_bo,
 425                        struct nouveau_page_flip_state *s,
 426                        struct nouveau_fence **pfence)
 427 {
 428         struct drm_nouveau_private *dev_priv = chan->dev->dev_private;
 429         struct drm_device *dev = chan->dev;
 430         unsigned long flags;
 431         int ret;
 432
 433         /* Queue it to the pending list */
 434         spin_lock_irqsave(&dev->event_lock, flags);
 435         list_add_tail(&s->head, &chan->nvsw.flip);
 436         spin_unlock_irqrestore(&dev->event_lock, flags);
 437
 438         /* Synchronize with the old framebuffer */
 439         ret = nouveau_fence_sync(old_bo->bo.sync_obj, chan);
 440         if (ret)
 441                 goto fail;
 442
 443         /* Emit the pageflip */
 444         ret = RING_SPACE(chan, 2);
 445         if (ret)
 446                 goto fail;
 447
 448         if (dev_priv->card_type < NV_C0)
 449                 BEGIN_RING(chan, NvSubSw, NV_SW_PAGE_FLIP, 1);
 450         else
 451                 BEGIN_NVC0(chan, 2, NvSubM2MF, 0x0500, 1);
 452         OUT_RING  (chan, 0);
 453         FIRE_RING (chan);
 454
 455         ret = nouveau_fence_new(chan, pfence, true);
 456         if (ret)
 457                 goto fail;
 458
 459         return 0;
 460 fail:
 461         spin_lock_irqsave(&dev->event_lock, flags);
 462         list_del(&s->head);
 463         spin_unlock_irqrestore(&dev->event_lock, flags);
 464         return ret;
 465 }
 466
 467 int
 468 nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
 469                        struct drm_pending_vblank_event *event)
 470 {
 471         struct drm_device *dev = crtc->dev;
 472         struct drm_nouveau_private *dev_priv = dev->dev_private;
 473         struct nouveau_bo *old_bo = nouveau_framebuffer(crtc->fb)->nvbo;
 474         struct nouveau_bo *new_bo = nouveau_framebuffer(fb)->nvbo;
 475         struct nouveau_page_flip_state *s;
 476         struct nouveau_channel *chan;
 477         struct nouveau_fence *fence;
 478         int ret;
 479
 480         if (!dev_priv->channel)
 481                 return -ENODEV;
 482
 483         s = kzalloc(sizeof(*s), GFP_KERNEL);
 484         if (!s)
 485                 return -ENOMEM;
 486
 487         /* Don't let the buffers go away while we flip */
 488         ret = nouveau_page_flip_reserve(old_bo, new_bo);
 489         if (ret)
 490                 goto fail_free;
 491
 492         /* Initialize a page flip struct */
 493         *s = (struct nouveau_page_flip_state)
 494                 { { }, event, nouveau_crtc(crtc)->index,
 495                   fb->bits_per_pixel, fb->pitches[0], crtc->x, crtc->y,
 496                   new_bo->bo.offset };
 497
 498         /* Choose the channel the flip will be handled in */
 499         chan = nouveau_fence_channel(new_bo->bo.sync_obj);
 500         if (!chan)
 501                 chan = nouveau_channel_get_unlocked(dev_priv->channel);
 502         mutex_lock(&chan->mutex);
 503
 504         /* Emit a page flip */
 505         if (dev_priv->card_type >= NV_50) {
 506                 if (dev_priv->card_type >= NV_D0)
 507                         ret = nvd0_display_flip_next(crtc, fb, chan, 0);
 508                 else
 509                         ret = nv50_display_flip_next(crtc, fb, chan);
 510                 if (ret) {
 511                         nouveau_channel_put(&chan);
 512                         goto fail_unreserve;
 513                 }
 514         }
 515
 516         ret = nouveau_page_flip_emit(chan, old_bo, new_bo, s, &fence);
 517         nouveau_channel_put(&chan);
 518         if (ret)
 519                 goto fail_unreserve;
 520
 521         /* Update the crtc struct and cleanup */
 522         crtc->fb = fb;
 523
 524         nouveau_page_flip_unreserve(old_bo, new_bo, fence);
 525         nouveau_fence_unref(&fence);
 526         return 0;
 527
 528 fail_unreserve:
 529         nouveau_page_flip_unreserve(old_bo, new_bo, NULL);
 530 fail_free:
 531         kfree(s);
 532         return ret;
 533 }
 534
 535 int
 536 nouveau_finish_page_flip(struct nouveau_channel *chan,
 537                          struct nouveau_page_flip_state *ps)
 538 {
 539         struct drm_device *dev = chan->dev;
 540         struct nouveau_page_flip_state *s;
 541         unsigned long flags;
 542
 543         spin_lock_irqsave(&dev->event_lock, flags);
 544
 545         if (list_empty(&chan->nvsw.flip)) {
 546                 NV_ERROR(dev, "Unexpected pageflip in channel %d.\n", chan->id);
 547                 spin_unlock_irqrestore(&dev->event_lock, flags);
 548                 return -EINVAL;
 549         }
 550
 551         s = list_first_entry(&chan->nvsw.flip,
 552                              struct nouveau_page_flip_state, head);
 553         if (s->event) {
 554                 struct drm_pending_vblank_event *e = s->event;
 555                 struct timeval now;
 556
 557                 do_gettimeofday(&now);
 558                 e->event.sequence = 0;
 559                 e->event.tv_sec = now.tv_sec;
 560                 e->event.tv_usec = now.tv_usec;
 561                 list_add_tail(&e->base.link, &e->base.file_priv->event_list);
 562                 wake_up_interruptible(&e->base.file_priv->event_wait);
 563         }
 564
 565         list_del(&s->head);
 566         if (ps)
 567                 *ps = *s;
 568         kfree(s);
 569
 570         spin_unlock_irqrestore(&dev->event_lock, flags);
 571         return 0;
 572 }
 573
 574 int
 575 nouveau_display_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
 576                             struct drm_mode_create_dumb *args)
 577 {
 578         struct nouveau_bo *bo;
 579         int ret;
 580
 581         args->pitch = roundup(args->width * (args->bpp / 8), 256);
 582         args->size = args->pitch * args->height;
 583         args->size = roundup(args->size, PAGE_SIZE);
 584
 585         ret = nouveau_gem_new(dev, args->size, 0, TTM_PL_FLAG_VRAM, 0, 0, &bo);
 586         if (ret)
 587                 return ret;
 588
 589         ret = drm_gem_handle_create(file_priv, bo->gem, &args->handle);
 590         drm_gem_object_unreference_unlocked(bo->gem);
 591         return ret;
 592 }
 593
 594 int
 595 nouveau_display_dumb_destroy(struct drm_file *file_priv, struct drm_device *dev,
 596                              uint32_t handle)
 597 {
 598         return drm_gem_handle_delete(file_priv, handle);
 599 }
 600
 601 int
 602 nouveau_display_dumb_map_offset(struct drm_file *file_priv,
 603                                 struct drm_device *dev,
 604                                 uint32_t handle, uint64_t *poffset)
 605 {
 606         struct drm_gem_object *gem;
 607
 608         gem = drm_gem_object_lookup(dev, file_priv, handle);
 609         if (gem) {
 610                 struct nouveau_bo *bo = gem->driver_private;
 611                 *poffset = bo->bo.addr_space_offset;
 612                 drm_gem_object_unreference_unlocked(gem);
 613                 return 0;
 614         }
 615
 616         return -ENOENT;
 617 }