kernel/drivers/gpu/drm/udl/udl_fb.c

   1 /*
   2  * Copyright (C) 2012 Red Hat
   3  *
   4  * based in parts on udlfb.c:
   5  * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
   6  * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
   7  * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License v2. See the file COPYING in the main directory of this archive for
  11  * more details.
  12  */
  13 #include <linux/module.h>
  14 #include <linux/slab.h>
  15 #include <linux/fb.h>
  16 #include <linux/dma-buf.h>
  17
  18 #include <drm/drmP.h>
  19 #include <drm/drm_crtc.h>
  20 #include <drm/drm_crtc_helper.h>
  21 #include "udl_drv.h"
  22
  23 #include <drm/drm_fb_helper.h>
  24
  25 #define DL_DEFIO_WRITE_DELAY    (HZ/20) /* fb_deferred_io.delay in jiffies */
  26
  27 static int fb_defio = 0;  /* Optionally enable experimental fb_defio mmap support */
  28 static int fb_bpp = 16;
  29
  30 module_param(fb_bpp, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
  31 module_param(fb_defio, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
  32
  33 struct udl_fbdev {
  34         struct drm_fb_helper helper;
  35         struct udl_framebuffer ufb;
  36         struct list_head fbdev_list;
  37         int fb_count;
  38 };
  39
  40 #define DL_ALIGN_UP(x, a) ALIGN(x, a)
  41 #define DL_ALIGN_DOWN(x, a) ALIGN(x-(a-1), a)
  42
  43 /** Read the red component (0..255) of a 32 bpp colour. */
  44 #define DLO_RGB_GETRED(col) (uint8_t)((col) & 0xFF)
  45
  46 /** Read the green component (0..255) of a 32 bpp colour. */
  47 #define DLO_RGB_GETGRN(col) (uint8_t)(((col) >> 8) & 0xFF)
  48
  49 /** Read the blue component (0..255) of a 32 bpp colour. */
  50 #define DLO_RGB_GETBLU(col) (uint8_t)(((col) >> 16) & 0xFF)
  51
  52 /** Return red/green component of a 16 bpp colour number. */
  53 #define DLO_RG16(red, grn) (uint8_t)((((red) & 0xF8) | ((grn) >> 5)) & 0xFF)
  54
  55 /** Return green/blue component of a 16 bpp colour number. */
  56 #define DLO_GB16(grn, blu) (uint8_t)(((((grn) & 0x1C) << 3) | ((blu) >> 3)) & 0xFF)
  57
  58 /** Return 8 bpp colour number from red, green and blue components. */
  59 #define DLO_RGB8(red, grn, blu) ((((red) << 5) | (((grn) & 3) << 3) | ((blu) & 7)) & 0xFF)
  60
  61 #if 0
  62 static uint8_t rgb8(uint32_t col)
  63 {
  64         uint8_t red = DLO_RGB_GETRED(col);
  65         uint8_t grn = DLO_RGB_GETGRN(col);
  66         uint8_t blu = DLO_RGB_GETBLU(col);
  67
  68         return DLO_RGB8(red, grn, blu);
  69 }
  70
  71 static uint16_t rgb16(uint32_t col)
  72 {
  73         uint8_t red = DLO_RGB_GETRED(col);
  74         uint8_t grn = DLO_RGB_GETGRN(col);
  75         uint8_t blu = DLO_RGB_GETBLU(col);
  76
  77         return (DLO_RG16(red, grn) << 8) + DLO_GB16(grn, blu);
  78 }
  79 #endif
  80
  81 /*
  82  * NOTE: fb_defio.c is holding info->fbdefio.mutex
  83  *   Touching ANY framebuffer memory that triggers a page fault
  84  *   in fb_defio will cause a deadlock, when it also tries to
  85  *   grab the same mutex.
  86  */
  87 static void udlfb_dpy_deferred_io(struct fb_info *info,
  88                                   struct list_head *pagelist)
  89 {
  90         struct page *cur;
  91         struct fb_deferred_io *fbdefio = info->fbdefio;
  92         struct udl_fbdev *ufbdev = info->par;
  93         struct drm_device *dev = ufbdev->ufb.base.dev;
  94         struct udl_device *udl = dev->dev_private;
  95         struct urb *urb;
  96         char *cmd;
  97         cycles_t start_cycles, end_cycles;
  98         int bytes_sent = 0;
  99         int bytes_identical = 0;
 100         int bytes_rendered = 0;
 101
 102         if (!fb_defio)
 103                 return;
 104
 105         start_cycles = get_cycles();
 106
 107         urb = udl_get_urb(dev);
 108         if (!urb)
 109                 return;
 110
 111         cmd = urb->transfer_buffer;
 112
 113         /* walk the written page list and render each to device */
 114         list_for_each_entry(cur, &fbdefio->pagelist, lru) {
 115
 116                 if (udl_render_hline(dev, (ufbdev->ufb.base.bits_per_pixel / 8),
 117                                      &urb, (char *) info->fix.smem_start,
 118                                      &cmd, cur->index << PAGE_SHIFT,
 119                                      cur->index << PAGE_SHIFT,
 120                                      PAGE_SIZE, &bytes_identical, &bytes_sent))
 121                         goto error;
 122                 bytes_rendered += PAGE_SIZE;
 123         }
 124
 125         if (cmd > (char *) urb->transfer_buffer) {
 126                 /* Send partial buffer remaining before exiting */
 127                 int len = cmd - (char *) urb->transfer_buffer;
 128                 udl_submit_urb(dev, urb, len);
 129                 bytes_sent += len;
 130         } else
 131                 udl_urb_completion(urb);
 132
 133 error:
 134         atomic_add(bytes_sent, &udl->bytes_sent);
 135         atomic_add(bytes_identical, &udl->bytes_identical);
 136         atomic_add(bytes_rendered, &udl->bytes_rendered);
 137         end_cycles = get_cycles();
 138         atomic_add(((unsigned int) ((end_cycles - start_cycles)
 139                     >> 10)), /* Kcycles */
 140                    &udl->cpu_kcycles_used);
 141 }
 142
 143 int udl_handle_damage(struct udl_framebuffer *fb, int x, int y,
 144                       int width, int height)
 145 {
 146         struct drm_device *dev = fb->base.dev;
 147         struct udl_device *udl = dev->dev_private;
 148         int i, ret;
 149         char *cmd;
 150         cycles_t start_cycles, end_cycles;
 151         int bytes_sent = 0;
 152         int bytes_identical = 0;
 153         struct urb *urb;
 154         int aligned_x;
 155         int bpp = (fb->base.bits_per_pixel / 8);
 156         int x2, y2;
 157         bool store_for_later = false;
 158         unsigned long flags;
 159
 160         if (!fb->active_16)
 161                 return 0;
 162
 163         if (!fb->obj->vmapping) {
 164                 ret = udl_gem_vmap(fb->obj);
 165                 if (ret == -ENOMEM) {
 166                         DRM_ERROR("failed to vmap fb\n");
 167                         return 0;
 168                 }
 169                 if (!fb->obj->vmapping) {
 170                         DRM_ERROR("failed to vmapping\n");
 171                         return 0;
 172                 }
 173         }
 174
 175         aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long));
 176         width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long));
 177         x = aligned_x;
 178
 179         if ((width <= 0) ||
 180             (x + width > fb->base.width) ||
 181             (y + height > fb->base.height))
 182                 return -EINVAL;
 183
 184         /* if we are in atomic just store the info
 185            can't test inside spin lock */
 186         if (in_atomic())
 187                 store_for_later = true;
 188
 189         x2 = x + width - 1;
 190         y2 = y + height - 1;
 191
 192         spin_lock_irqsave(&fb->dirty_lock, flags);
 193
 194         if (fb->y1 < y)
 195                 y = fb->y1;
 196         if (fb->y2 > y2)
 197                 y2 = fb->y2;
 198         if (fb->x1 < x)
 199                 x = fb->x1;
 200         if (fb->x2 > x2)
 201                 x2 = fb->x2;
 202
 203         if (store_for_later) {
 204                 fb->x1 = x;
 205                 fb->x2 = x2;
 206                 fb->y1 = y;
 207                 fb->y2 = y2;
 208                 spin_unlock_irqrestore(&fb->dirty_lock, flags);
 209                 return 0;
 210         }
 211
 212         fb->x1 = fb->y1 = INT_MAX;
 213         fb->x2 = fb->y2 = 0;
 214
 215         spin_unlock_irqrestore(&fb->dirty_lock, flags);
 216         start_cycles = get_cycles();
 217
 218         urb = udl_get_urb(dev);
 219         if (!urb)
 220                 return 0;
 221         cmd = urb->transfer_buffer;
 222
 223         for (i = y; i <= y2 ; i++) {
 224                 const int line_offset = fb->base.pitches[0] * i;
 225                 const int byte_offset = line_offset + (x * bpp);
 226                 const int dev_byte_offset = (fb->base.width * bpp * i) + (x * bpp);
 227                 if (udl_render_hline(dev, bpp, &urb,
 228                                      (char *) fb->obj->vmapping,
 229                                      &cmd, byte_offset, dev_byte_offset,
 230                                      (x2 - x + 1) * bpp,
 231                                      &bytes_identical, &bytes_sent))
 232                         goto error;
 233         }
 234
 235         if (cmd > (char *) urb->transfer_buffer) {
 236                 /* Send partial buffer remaining before exiting */
 237                 int len = cmd - (char *) urb->transfer_buffer;
 238                 ret = udl_submit_urb(dev, urb, len);
 239                 bytes_sent += len;
 240         } else
 241                 udl_urb_completion(urb);
 242
 243 error:
 244         atomic_add(bytes_sent, &udl->bytes_sent);
 245         atomic_add(bytes_identical, &udl->bytes_identical);
 246         atomic_add(width*height*bpp, &udl->bytes_rendered);
 247         end_cycles = get_cycles();
 248         atomic_add(((unsigned int) ((end_cycles - start_cycles)
 249                     >> 10)), /* Kcycles */
 250                    &udl->cpu_kcycles_used);
 251
 252         return 0;
 253 }
 254
 255 static int udl_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 256 {
 257         unsigned long start = vma->vm_start;
 258         unsigned long size = vma->vm_end - vma->vm_start;
 259         unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
 260         unsigned long page, pos;
 261
 262         if (offset + size > info->fix.smem_len)
 263                 return -EINVAL;
 264
 265         pos = (unsigned long)info->fix.smem_start + offset;
 266
 267         pr_notice("mmap() framebuffer addr:%lu size:%lu\n",
 268                   pos, size);
 269
 270         while (size > 0) {
 271                 page = vmalloc_to_pfn((void *)pos);
 272                 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
 273                         return -EAGAIN;
 274
 275                 start += PAGE_SIZE;
 276                 pos += PAGE_SIZE;
 277                 if (size > PAGE_SIZE)
 278                         size -= PAGE_SIZE;
 279                 else
 280                         size = 0;
 281         }
 282
 283         /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
 284         return 0;
 285 }
 286
 287 static void udl_fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
 288 {
 289         struct udl_fbdev *ufbdev = info->par;
 290
 291         sys_fillrect(info, rect);
 292
 293         udl_handle_damage(&ufbdev->ufb, rect->dx, rect->dy, rect->width,
 294                           rect->height);
 295 }
 296
 297 static void udl_fb_copyarea(struct fb_info *info, const struct fb_copyarea *region)
 298 {
 299         struct udl_fbdev *ufbdev = info->par;
 300
 301         sys_copyarea(info, region);
 302
 303         udl_handle_damage(&ufbdev->ufb, region->dx, region->dy, region->width,
 304                           region->height);
 305 }
 306
 307 static void udl_fb_imageblit(struct fb_info *info, const struct fb_image *image)
 308 {
 309         struct udl_fbdev *ufbdev = info->par;
 310
 311         sys_imageblit(info, image);
 312
 313         udl_handle_damage(&ufbdev->ufb, image->dx, image->dy, image->width,
 314                           image->height);
 315 }
 316
 317 /*
 318  * It's common for several clients to have framebuffer open simultaneously.
 319  * e.g. both fbcon and X. Makes things interesting.
 320  * Assumes caller is holding info->lock (for open and release at least)
 321  */
 322 static int udl_fb_open(struct fb_info *info, int user)
 323 {
 324         struct udl_fbdev *ufbdev = info->par;
 325         struct drm_device *dev = ufbdev->ufb.base.dev;
 326         struct udl_device *udl = dev->dev_private;
 327
 328         /* If the USB device is gone, we don't accept new opens */
 329         if (drm_device_is_unplugged(udl->ddev))
 330                 return -ENODEV;
 331
 332         ufbdev->fb_count++;
 333
 334         if (fb_defio && (info->fbdefio == NULL)) {
 335                 /* enable defio at last moment if not disabled by client */
 336
 337                 struct fb_deferred_io *fbdefio;
 338
 339                 fbdefio = kmalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
 340
 341                 if (fbdefio) {
 342                         fbdefio->delay = DL_DEFIO_WRITE_DELAY;
 343                         fbdefio->deferred_io = udlfb_dpy_deferred_io;
 344                 }
 345
 346                 info->fbdefio = fbdefio;
 347                 fb_deferred_io_init(info);
 348         }
 349
 350         pr_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n",
 351                   info->node, user, info, ufbdev->fb_count);
 352
 353         return 0;
 354 }
 355
 356
 357 /*
 358  * Assumes caller is holding info->lock mutex (for open and release at least)
 359  */
 360 static int udl_fb_release(struct fb_info *info, int user)
 361 {
 362         struct udl_fbdev *ufbdev = info->par;
 363
 364         ufbdev->fb_count--;
 365
 366         if ((ufbdev->fb_count == 0) && (info->fbdefio)) {
 367                 fb_deferred_io_cleanup(info);
 368                 kfree(info->fbdefio);
 369                 info->fbdefio = NULL;
 370                 info->fbops->fb_mmap = udl_fb_mmap;
 371         }
 372
 373         pr_warn("released /dev/fb%d user=%d count=%d\n",
 374                 info->node, user, ufbdev->fb_count);
 375
 376         return 0;
 377 }
 378
 379 static struct fb_ops udlfb_ops = {
 380         .owner = THIS_MODULE,
 381         .fb_check_var = drm_fb_helper_check_var,
 382         .fb_set_par = drm_fb_helper_set_par,
 383         .fb_fillrect = udl_fb_fillrect,
 384         .fb_copyarea = udl_fb_copyarea,
 385         .fb_imageblit = udl_fb_imageblit,
 386         .fb_pan_display = drm_fb_helper_pan_display,
 387         .fb_blank = drm_fb_helper_blank,
 388         .fb_setcmap = drm_fb_helper_setcmap,
 389         .fb_debug_enter = drm_fb_helper_debug_enter,
 390         .fb_debug_leave = drm_fb_helper_debug_leave,
 391         .fb_mmap = udl_fb_mmap,
 392         .fb_open = udl_fb_open,
 393         .fb_release = udl_fb_release,
 394 };
 395
 396 static int udl_user_framebuffer_dirty(struct drm_framebuffer *fb,
 397                                       struct drm_file *file,
 398                                       unsigned flags, unsigned color,
 399                                       struct drm_clip_rect *clips,
 400                                       unsigned num_clips)
 401 {
 402         struct udl_framebuffer *ufb = to_udl_fb(fb);
 403         int i;
 404         int ret = 0;
 405
 406         drm_modeset_lock_all(fb->dev);
 407
 408         if (!ufb->active_16)
 409                 goto unlock;
 410
 411         if (ufb->obj->base.import_attach) {
 412                 ret = dma_buf_begin_cpu_access(ufb->obj->base.import_attach->dmabuf,
 413                                                0, ufb->obj->base.size,
 414                                                DMA_FROM_DEVICE);
 415                 if (ret)
 416                         goto unlock;
 417         }
 418
 419         for (i = 0; i < num_clips; i++) {
 420                 ret = udl_handle_damage(ufb, clips[i].x1, clips[i].y1,
 421                                   clips[i].x2 - clips[i].x1,
 422                                   clips[i].y2 - clips[i].y1);
 423                 if (ret)
 424                         break;
 425         }
 426
 427         if (ufb->obj->base.import_attach) {
 428                 dma_buf_end_cpu_access(ufb->obj->base.import_attach->dmabuf,
 429                                        0, ufb->obj->base.size,
 430                                        DMA_FROM_DEVICE);
 431         }
 432
 433  unlock:
 434         drm_modeset_unlock_all(fb->dev);
 435
 436         return ret;
 437 }
 438
 439 static void udl_user_framebuffer_destroy(struct drm_framebuffer *fb)
 440 {
 441         struct udl_framebuffer *ufb = to_udl_fb(fb);
 442
 443         if (ufb->obj)
 444                 drm_gem_object_unreference_unlocked(&ufb->obj->base);
 445
 446         drm_framebuffer_cleanup(fb);
 447         kfree(ufb);
 448 }
 449
 450 static const struct drm_framebuffer_funcs udlfb_funcs = {
 451         .destroy = udl_user_framebuffer_destroy,
 452         .dirty = udl_user_framebuffer_dirty,
 453 };
 454
 455
 456 static int
 457 udl_framebuffer_init(struct drm_device *dev,
 458                      struct udl_framebuffer *ufb,
 459                      struct drm_mode_fb_cmd2 *mode_cmd,
 460                      struct udl_gem_object *obj)
 461 {
 462         int ret;
 463
 464         spin_lock_init(&ufb->dirty_lock);
 465         ufb->obj = obj;
 466         drm_helper_mode_fill_fb_struct(&ufb->base, mode_cmd);
 467         ret = drm_framebuffer_init(dev, &ufb->base, &udlfb_funcs);
 468         return ret;
 469 }
 470
 471
 472 static int udlfb_create(struct drm_fb_helper *helper,
 473                         struct drm_fb_helper_surface_size *sizes)
 474 {
 475         struct udl_fbdev *ufbdev =
 476                 container_of(helper, struct udl_fbdev, helper);
 477         struct drm_device *dev = ufbdev->helper.dev;
 478         struct fb_info *info;
 479         struct device *device = dev->dev;
 480         struct drm_framebuffer *fb;
 481         struct drm_mode_fb_cmd2 mode_cmd;
 482         struct udl_gem_object *obj;
 483         uint32_t size;
 484         int ret = 0;
 485
 486         if (sizes->surface_bpp == 24)
 487                 sizes->surface_bpp = 32;
 488
 489         mode_cmd.width = sizes->surface_width;
 490         mode_cmd.height = sizes->surface_height;
 491         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
 492
 493         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 494                                                           sizes->surface_depth);
 495
 496         size = mode_cmd.pitches[0] * mode_cmd.height;
 497         size = ALIGN(size, PAGE_SIZE);
 498
 499         obj = udl_gem_alloc_object(dev, size);
 500         if (!obj)
 501                 goto out;
 502
 503         ret = udl_gem_vmap(obj);
 504         if (ret) {
 505                 DRM_ERROR("failed to vmap fb\n");
 506                 goto out_gfree;
 507         }
 508
 509         info = framebuffer_alloc(0, device);
 510         if (!info) {
 511                 ret = -ENOMEM;
 512                 goto out_gfree;
 513         }
 514         info->par = ufbdev;
 515
 516         ret = udl_framebuffer_init(dev, &ufbdev->ufb, &mode_cmd, obj);
 517         if (ret)
 518                 goto out_gfree;
 519
 520         fb = &ufbdev->ufb.base;
 521
 522         ufbdev->helper.fb = fb;
 523         ufbdev->helper.fbdev = info;
 524
 525         strcpy(info->fix.id, "udldrmfb");
 526
 527         info->screen_base = ufbdev->ufb.obj->vmapping;
 528         info->fix.smem_len = size;
 529         info->fix.smem_start = (unsigned long)ufbdev->ufb.obj->vmapping;
 530
 531         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 532         info->fbops = &udlfb_ops;
 533         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 534         drm_fb_helper_fill_var(info, &ufbdev->helper, sizes->fb_width, sizes->fb_height);
 535
 536         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 537         if (ret) {
 538                 ret = -ENOMEM;
 539                 goto out_gfree;
 540         }
 541
 542
 543         DRM_DEBUG_KMS("allocated %dx%d vmal %p\n",
 544                       fb->width, fb->height,
 545                       ufbdev->ufb.obj->vmapping);
 546
 547         return ret;
 548 out_gfree:
 549         drm_gem_object_unreference(&ufbdev->ufb.obj->base);
 550 out:
 551         return ret;
 552 }
 553
 554 static const struct drm_fb_helper_funcs udl_fb_helper_funcs = {
 555         .fb_probe = udlfb_create,
 556 };
 557
 558 static void udl_fbdev_destroy(struct drm_device *dev,
 559                               struct udl_fbdev *ufbdev)
 560 {
 561         struct fb_info *info;
 562         if (ufbdev->helper.fbdev) {
 563                 info = ufbdev->helper.fbdev;
 564                 unregister_framebuffer(info);
 565                 if (info->cmap.len)
 566                         fb_dealloc_cmap(&info->cmap);
 567                 framebuffer_release(info);
 568         }
 569         drm_fb_helper_fini(&ufbdev->helper);
 570         drm_framebuffer_unregister_private(&ufbdev->ufb.base);
 571         drm_framebuffer_cleanup(&ufbdev->ufb.base);
 572         drm_gem_object_unreference_unlocked(&ufbdev->ufb.obj->base);
 573 }
 574
 575 int udl_fbdev_init(struct drm_device *dev)
 576 {
 577         struct udl_device *udl = dev->dev_private;
 578         int bpp_sel = fb_bpp;
 579         struct udl_fbdev *ufbdev;
 580         int ret;
 581
 582         ufbdev = kzalloc(sizeof(struct udl_fbdev), GFP_KERNEL);
 583         if (!ufbdev)
 584                 return -ENOMEM;
 585
 586         udl->fbdev = ufbdev;
 587
 588         drm_fb_helper_prepare(dev, &ufbdev->helper, &udl_fb_helper_funcs);
 589
 590         ret = drm_fb_helper_init(dev, &ufbdev->helper,
 591                                  1, 1);
 592         if (ret)
 593                 goto free;
 594
 595         ret = drm_fb_helper_single_add_all_connectors(&ufbdev->helper);
 596         if (ret)
 597                 goto fini;
 598
 599         /* disable all the possible outputs/crtcs before entering KMS mode */
 600         drm_helper_disable_unused_functions(dev);
 601
 602         ret = drm_fb_helper_initial_config(&ufbdev->helper, bpp_sel);
 603         if (ret)
 604                 goto fini;
 605
 606         return 0;
 607
 608 fini:
 609         drm_fb_helper_fini(&ufbdev->helper);
 610 free:
 611         kfree(ufbdev);
 612         return ret;
 613 }
 614
 615 void udl_fbdev_cleanup(struct drm_device *dev)
 616 {
 617         struct udl_device *udl = dev->dev_private;
 618         if (!udl->fbdev)
 619                 return;
 620
 621         udl_fbdev_destroy(dev, udl->fbdev);
 622         kfree(udl->fbdev);
 623         udl->fbdev = NULL;
 624 }
 625
 626 void udl_fbdev_unplug(struct drm_device *dev)
 627 {
 628         struct udl_device *udl = dev->dev_private;
 629         struct udl_fbdev *ufbdev;
 630         if (!udl->fbdev)
 631                 return;
 632
 633         ufbdev = udl->fbdev;
 634         if (ufbdev->helper.fbdev) {
 635                 struct fb_info *info;
 636                 info = ufbdev->helper.fbdev;
 637                 unlink_framebuffer(info);
 638         }
 639 }
 640
 641 struct drm_framebuffer *
 642 udl_fb_user_fb_create(struct drm_device *dev,
 643                    struct drm_file *file,
 644                    struct drm_mode_fb_cmd2 *mode_cmd)
 645 {
 646         struct drm_gem_object *obj;
 647         struct udl_framebuffer *ufb;
 648         int ret;
 649         uint32_t size;
 650
 651         obj = drm_gem_object_lookup(dev, file, mode_cmd->handles[0]);
 652         if (obj == NULL)
 653                 return ERR_PTR(-ENOENT);
 654
 655         size = mode_cmd->pitches[0] * mode_cmd->height;
 656         size = ALIGN(size, PAGE_SIZE);
 657
 658         if (size > obj->size) {
 659                 DRM_ERROR("object size not sufficient for fb %d %zu %d %d\n", size, obj->size, mode_cmd->pitches[0], mode_cmd->height);
 660                 return ERR_PTR(-ENOMEM);
 661         }
 662
 663         ufb = kzalloc(sizeof(*ufb), GFP_KERNEL);
 664         if (ufb == NULL)
 665                 return ERR_PTR(-ENOMEM);
 666
 667         ret = udl_framebuffer_init(dev, ufb, mode_cmd, to_udl_bo(obj));
 668         if (ret) {
 669                 kfree(ufb);
 670                 return ERR_PTR(-EINVAL);
 671         }
 672         return &ufb->base;
 673 }