drivers/video/fbdev/efifb.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Framebuffer driver for EFI/UEFI based system
   4  *
   5  * (c) 2006 Edgar Hucek <gimli@dark-green.com>
   6  * Original efi driver written by Gerd Knorr <kraxel@goldbach.in-berlin.de>
   7  *
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/efi.h>
  12 #include <linux/efi-bgrt.h>
  13 #include <linux/errno.h>
  14 #include <linux/fb.h>
  15 #include <linux/pci.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/printk.h>
  18 #include <linux/screen_info.h>
  19 #include <video/vga.h>
  20 #include <asm/efi.h>
  21 #include <drm/drm_utils.h> /* For drm_get_panel_orientation_quirk */
  22 #include <drm/drm_connector.h>  /* For DRM_MODE_PANEL_ORIENTATION_* */
  23
  24 struct bmp_file_header {
  25         u16 id;
  26         u32 file_size;
  27         u32 reserved;
  28         u32 bitmap_offset;
  29 } __packed;
  30
  31 struct bmp_dib_header {
  32         u32 dib_header_size;
  33         s32 width;
  34         s32 height;
  35         u16 planes;
  36         u16 bpp;
  37         u32 compression;
  38         u32 bitmap_size;
  39         u32 horz_resolution;
  40         u32 vert_resolution;
  41         u32 colors_used;
  42         u32 colors_important;
  43 } __packed;
  44
  45 static bool use_bgrt = true;
  46 static bool request_mem_succeeded = false;
  47 static u64 mem_flags = EFI_MEMORY_WC | EFI_MEMORY_UC;
  48
  49 static struct fb_var_screeninfo efifb_defined = {
  50         .activate               = FB_ACTIVATE_NOW,
  51         .height                 = -1,
  52         .width                  = -1,
  53         .right_margin           = 32,
  54         .upper_margin           = 16,
  55         .lower_margin           = 4,
  56         .vsync_len              = 4,
  57         .vmode                  = FB_VMODE_NONINTERLACED,
  58 };
  59
  60 static struct fb_fix_screeninfo efifb_fix = {
  61         .id                     = "EFI VGA",
  62         .type                   = FB_TYPE_PACKED_PIXELS,
  63         .accel                  = FB_ACCEL_NONE,
  64         .visual                 = FB_VISUAL_TRUECOLOR,
  65 };
  66
  67 static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
  68                            unsigned blue, unsigned transp,
  69                            struct fb_info *info)
  70 {
  71         /*
  72          *  Set a single color register. The values supplied are
  73          *  already rounded down to the hardware's capabilities
  74          *  (according to the entries in the `var' structure). Return
  75          *  != 0 for invalid regno.
  76          */
  77
  78         if (regno >= info->cmap.len)
  79                 return 1;
  80
  81         if (regno < 16) {
  82                 red   >>= 16 - info->var.red.length;
  83                 green >>= 16 - info->var.green.length;
  84                 blue  >>= 16 - info->var.blue.length;
  85                 ((u32 *)(info->pseudo_palette))[regno] =
  86                         (red   << info->var.red.offset)   |
  87                         (green << info->var.green.offset) |
  88                         (blue  << info->var.blue.offset);
  89         }
  90         return 0;
  91 }
  92
  93 /*
  94  * If fbcon deffered console takeover is configured, the intent is for the
  95  * framebuffer to show the boot graphics (e.g. vendor logo) until there is some
  96  * (error) message to display. But the boot graphics may have been destroyed by
  97  * e.g. option ROM output, detect this and restore the boot graphics.
  98  */
  99 #if defined CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER && \
 100     defined CONFIG_ACPI_BGRT
 101 static void efifb_copy_bmp(u8 *src, u32 *dst, int width, struct screen_info *si)
 102 {
 103         u8 r, g, b;
 104
 105         while (width--) {
 106                 b = *src++;
 107                 g = *src++;
 108                 r = *src++;
 109                 *dst++ = (r << si->red_pos)   |
 110                          (g << si->green_pos) |
 111                          (b << si->blue_pos);
 112         }
 113 }
 114
 115 #ifdef CONFIG_X86
 116 /*
 117  * On x86 some firmwares use a low non native resolution for the display when
 118  * they have shown some text messages. While keeping the bgrt filled with info
 119  * for the native resolution. If the bgrt image intended for the native
 120  * resolution still fits, it will be displayed very close to the right edge of
 121  * the display looking quite bad. This function checks for this.
 122  */
 123 static bool efifb_bgrt_sanity_check(struct screen_info *si, u32 bmp_width)
 124 {
 125         static const int default_resolutions[][2] = {
 126                 {  800,  600 },
 127                 { 1024,  768 },
 128                 { 1280, 1024 },
 129         };
 130         u32 i, right_margin;
 131
 132         for (i = 0; i < ARRAY_SIZE(default_resolutions); i++) {
 133                 if (default_resolutions[i][0] == si->lfb_width &&
 134                     default_resolutions[i][1] == si->lfb_height)
 135                         break;
 136         }
 137         /* If not a default resolution used for textmode, this should be fine */
 138         if (i >= ARRAY_SIZE(default_resolutions))
 139                 return true;
 140
 141         /* If the right margin is 5 times smaller then the left one, reject */
 142         right_margin = si->lfb_width - (bgrt_tab.image_offset_x + bmp_width);
 143         if (right_margin < (bgrt_tab.image_offset_x / 5))
 144                 return false;
 145
 146         return true;
 147 }
 148 #else
 149 static bool efifb_bgrt_sanity_check(struct screen_info *si, u32 bmp_width)
 150 {
 151         return true;
 152 }
 153 #endif
 154
 155 static void efifb_show_boot_graphics(struct fb_info *info)
 156 {
 157         u32 bmp_width, bmp_height, bmp_pitch, screen_pitch, dst_x, y, src_y;
 158         struct screen_info *si = &screen_info;
 159         struct bmp_file_header *file_header;
 160         struct bmp_dib_header *dib_header;
 161         void *bgrt_image = NULL;
 162         u8 *dst = info->screen_base;
 163
 164         if (!use_bgrt)
 165                 return;
 166
 167         if (!bgrt_tab.image_address) {
 168                 pr_info("efifb: No BGRT, not showing boot graphics\n");
 169                 return;
 170         }
 171
 172         /* Avoid flashing the logo if we're going to print std probe messages */
 173         if (console_loglevel > CONSOLE_LOGLEVEL_QUIET)
 174                 return;
 175
 176         /* bgrt_tab.status is unreliable, so we don't check it */
 177
 178         if (si->lfb_depth != 32) {
 179                 pr_info("efifb: not 32 bits, not showing boot graphics\n");
 180                 return;
 181         }
 182
 183         bgrt_image = memremap(bgrt_tab.image_address, bgrt_image_size,
 184                               MEMREMAP_WB);
 185         if (!bgrt_image) {
 186                 pr_warn("efifb: Ignoring BGRT: failed to map image memory\n");
 187                 return;
 188         }
 189
 190         if (bgrt_image_size < (sizeof(*file_header) + sizeof(*dib_header)))
 191                 goto error;
 192
 193         file_header = bgrt_image;
 194         if (file_header->id != 0x4d42 || file_header->reserved != 0)
 195                 goto error;
 196
 197         dib_header = bgrt_image + sizeof(*file_header);
 198         if (dib_header->dib_header_size != 40 || dib_header->width < 0 ||
 199             dib_header->planes != 1 || dib_header->bpp != 24 ||
 200             dib_header->compression != 0)
 201                 goto error;
 202
 203         bmp_width = dib_header->width;
 204         bmp_height = abs(dib_header->height);
 205         bmp_pitch = round_up(3 * bmp_width, 4);
 206         screen_pitch = si->lfb_linelength;
 207
 208         if ((file_header->bitmap_offset + bmp_pitch * bmp_height) >
 209                                 bgrt_image_size)
 210                 goto error;
 211
 212         if ((bgrt_tab.image_offset_x + bmp_width) > si->lfb_width ||
 213             (bgrt_tab.image_offset_y + bmp_height) > si->lfb_height)
 214                 goto error;
 215
 216         if (!efifb_bgrt_sanity_check(si, bmp_width))
 217                 goto error;
 218
 219         pr_info("efifb: showing boot graphics\n");
 220
 221         for (y = 0; y < si->lfb_height; y++, dst += si->lfb_linelength) {
 222                 /* Only background? */
 223                 if (y < bgrt_tab.image_offset_y ||
 224                     y >= (bgrt_tab.image_offset_y + bmp_height)) {
 225                         memset(dst, 0, 4 * si->lfb_width);
 226                         continue;
 227                 }
 228
 229                 src_y = y - bgrt_tab.image_offset_y;
 230                 /* Positive header height means upside down row order */
 231                 if (dib_header->height > 0)
 232                         src_y = (bmp_height - 1) - src_y;
 233
 234                 memset(dst, 0, bgrt_tab.image_offset_x * 4);
 235                 dst_x = bgrt_tab.image_offset_x;
 236                 efifb_copy_bmp(bgrt_image + file_header->bitmap_offset +
 237                                             src_y * bmp_pitch,
 238                                (u32 *)dst + dst_x, bmp_width, si);
 239                 dst_x += bmp_width;
 240                 memset((u32 *)dst + dst_x, 0, (si->lfb_width - dst_x) * 4);
 241         }
 242
 243         memunmap(bgrt_image);
 244         return;
 245
 246 error:
 247         memunmap(bgrt_image);
 248         pr_warn("efifb: Ignoring BGRT: unexpected or invalid BMP data\n");
 249 }
 250 #else
 251 static inline void efifb_show_boot_graphics(struct fb_info *info) {}
 252 #endif
 253
 254 static void efifb_destroy(struct fb_info *info)
 255 {
 256         if (info->screen_base) {
 257                 if (mem_flags & (EFI_MEMORY_UC | EFI_MEMORY_WC))
 258                         iounmap(info->screen_base);
 259                 else
 260                         memunmap(info->screen_base);
 261         }
 262         if (request_mem_succeeded)
 263                 release_mem_region(info->apertures->ranges[0].base,
 264                                    info->apertures->ranges[0].size);
 265         fb_dealloc_cmap(&info->cmap);
 266 }
 267
 268 static struct fb_ops efifb_ops = {
 269         .owner          = THIS_MODULE,
 270         .fb_destroy     = efifb_destroy,
 271         .fb_setcolreg   = efifb_setcolreg,
 272         .fb_fillrect    = cfb_fillrect,
 273         .fb_copyarea    = cfb_copyarea,
 274         .fb_imageblit   = cfb_imageblit,
 275 };
 276
 277 static int efifb_setup(char *options)
 278 {
 279         char *this_opt;
 280
 281         if (options && *options) {
 282                 while ((this_opt = strsep(&options, ",")) != NULL) {
 283                         if (!*this_opt) continue;
 284
 285                         efifb_setup_from_dmi(&screen_info, this_opt);
 286
 287                         if (!strncmp(this_opt, "base:", 5))
 288                                 screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
 289                         else if (!strncmp(this_opt, "stride:", 7))
 290                                 screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
 291                         else if (!strncmp(this_opt, "height:", 7))
 292                                 screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
 293                         else if (!strncmp(this_opt, "width:", 6))
 294                                 screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
 295                         else if (!strcmp(this_opt, "nowc"))
 296                                 mem_flags &= ~EFI_MEMORY_WC;
 297                         else if (!strcmp(this_opt, "nobgrt"))
 298                                 use_bgrt = false;
 299                 }
 300         }
 301
 302         return 0;
 303 }
 304
 305 static inline bool fb_base_is_valid(void)
 306 {
 307         if (screen_info.lfb_base)
 308                 return true;
 309
 310         if (!(screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE))
 311                 return false;
 312
 313         if (screen_info.ext_lfb_base)
 314                 return true;
 315
 316         return false;
 317 }
 318
 319 #define efifb_attr_decl(name, fmt)                                      \
 320 static ssize_t name##_show(struct device *dev,                          \
 321                            struct device_attribute *attr,               \
 322                            char *buf)                                   \
 323 {                                                                       \
 324         return sprintf(buf, fmt "\n", (screen_info.lfb_##name));        \
 325 }                                                                       \
 326 static DEVICE_ATTR_RO(name)
 327
 328 efifb_attr_decl(base, "0x%x");
 329 efifb_attr_decl(linelength, "%u");
 330 efifb_attr_decl(height, "%u");
 331 efifb_attr_decl(width, "%u");
 332 efifb_attr_decl(depth, "%u");
 333
 334 static struct attribute *efifb_attrs[] = {
 335         &dev_attr_base.attr,
 336         &dev_attr_linelength.attr,
 337         &dev_attr_width.attr,
 338         &dev_attr_height.attr,
 339         &dev_attr_depth.attr,
 340         NULL
 341 };
 342 ATTRIBUTE_GROUPS(efifb);
 343
 344 static bool pci_dev_disabled;   /* FB base matches BAR of a disabled device */
 345
 346 static struct pci_dev *efifb_pci_dev;   /* dev with BAR covering the efifb */
 347 static struct resource *bar_resource;
 348 static u64 bar_offset;
 349
 350 static int efifb_probe(struct platform_device *dev)
 351 {
 352         struct fb_info *info;
 353         int err, orientation;
 354         unsigned int size_vmode;
 355         unsigned int size_remap;
 356         unsigned int size_total;
 357         char *option = NULL;
 358         efi_memory_desc_t md;
 359
 360         if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI || pci_dev_disabled)
 361                 return -ENODEV;
 362
 363         if (fb_get_options("efifb", &option))
 364                 return -ENODEV;
 365         efifb_setup(option);
 366
 367         /* We don't get linelength from UGA Draw Protocol, only from
 368          * EFI Graphics Protocol.  So if it's not in DMI, and it's not
 369          * passed in from the user, we really can't use the framebuffer.
 370          */
 371         if (!screen_info.lfb_linelength)
 372                 return -ENODEV;
 373
 374         if (!screen_info.lfb_depth)
 375                 screen_info.lfb_depth = 32;
 376         if (!screen_info.pages)
 377                 screen_info.pages = 1;
 378         if (!fb_base_is_valid()) {
 379                 printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
 380                 return -ENODEV;
 381         }
 382         printk(KERN_INFO "efifb: probing for efifb\n");
 383
 384         /* just assume they're all unset if any are */
 385         if (!screen_info.blue_size) {
 386                 screen_info.blue_size = 8;
 387                 screen_info.blue_pos = 0;
 388                 screen_info.green_size = 8;
 389                 screen_info.green_pos = 8;
 390                 screen_info.red_size = 8;
 391                 screen_info.red_pos = 16;
 392                 screen_info.rsvd_size = 8;
 393                 screen_info.rsvd_pos = 24;
 394         }
 395
 396         efifb_fix.smem_start = screen_info.lfb_base;
 397
 398         if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
 399                 u64 ext_lfb_base;
 400
 401                 ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;
 402                 efifb_fix.smem_start |= ext_lfb_base;
 403         }
 404
 405         if (bar_resource &&
 406             bar_resource->start + bar_offset != efifb_fix.smem_start) {
 407                 dev_info(&efifb_pci_dev->dev,
 408                          "BAR has moved, updating efifb address\n");
 409                 efifb_fix.smem_start = bar_resource->start + bar_offset;
 410         }
 411
 412         efifb_defined.bits_per_pixel = screen_info.lfb_depth;
 413         efifb_defined.xres = screen_info.lfb_width;
 414         efifb_defined.yres = screen_info.lfb_height;
 415         efifb_fix.line_length = screen_info.lfb_linelength;
 416
 417         /*   size_vmode -- that is the amount of memory needed for the
 418          *                 used video mode, i.e. the minimum amount of
 419          *                 memory we need. */
 420         size_vmode = efifb_defined.yres * efifb_fix.line_length;
 421
 422         /*   size_total -- all video memory we have. Used for
 423          *                 entries, ressource allocation and bounds
 424          *                 checking. */
 425         size_total = screen_info.lfb_size;
 426         if (size_total < size_vmode)
 427                 size_total = size_vmode;
 428
 429         /*   size_remap -- the amount of video memory we are going to
 430          *                 use for efifb.  With modern cards it is no
 431          *                 option to simply use size_total as that
 432          *                 wastes plenty of kernel address space. */
 433         size_remap  = size_vmode * 2;
 434         if (size_remap > size_total)
 435                 size_remap = size_total;
 436         if (size_remap % PAGE_SIZE)
 437                 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
 438         efifb_fix.smem_len = size_remap;
 439
 440         if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
 441                 request_mem_succeeded = true;
 442         } else {
 443                 /* We cannot make this fatal. Sometimes this comes from magic
 444                    spaces our resource handlers simply don't know about */
 445                 pr_warn("efifb: cannot reserve video memory at 0x%lx\n",
 446                         efifb_fix.smem_start);
 447         }
 448
 449         info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
 450         if (!info) {
 451                 pr_err("efifb: cannot allocate framebuffer\n");
 452                 err = -ENOMEM;
 453                 goto err_release_mem;
 454         }
 455         platform_set_drvdata(dev, info);
 456         info->pseudo_palette = info->par;
 457         info->par = NULL;
 458
 459         info->apertures = alloc_apertures(1);
 460         if (!info->apertures) {
 461                 err = -ENOMEM;
 462                 goto err_release_fb;
 463         }
 464         info->apertures->ranges[0].base = efifb_fix.smem_start;
 465         info->apertures->ranges[0].size = size_remap;
 466
 467         if (efi_enabled(EFI_BOOT) &&
 468             !efi_mem_desc_lookup(efifb_fix.smem_start, &md)) {
 469                 if ((efifb_fix.smem_start + efifb_fix.smem_len) >
 470                     (md.phys_addr + (md.num_pages << EFI_PAGE_SHIFT))) {
 471                         pr_err("efifb: video memory @ 0x%lx spans multiple EFI memory regions\n",
 472                                efifb_fix.smem_start);
 473                         err = -EIO;
 474                         goto err_release_fb;
 475                 }
 476                 /*
 477                  * If the UEFI memory map covers the efifb region, we may only
 478                  * remap it using the attributes the memory map prescribes.
 479                  */
 480                 md.attribute &= EFI_MEMORY_UC | EFI_MEMORY_WC |
 481                                 EFI_MEMORY_WT | EFI_MEMORY_WB;
 482                 if (md.attribute) {
 483                         mem_flags |= EFI_MEMORY_WT | EFI_MEMORY_WB;
 484                         mem_flags &= md.attribute;
 485                 }
 486         }
 487         if (mem_flags & EFI_MEMORY_WC)
 488                 info->screen_base = ioremap_wc(efifb_fix.smem_start,
 489                                                efifb_fix.smem_len);
 490         else if (mem_flags & EFI_MEMORY_UC)
 491                 info->screen_base = ioremap(efifb_fix.smem_start,
 492                                             efifb_fix.smem_len);
 493         else if (mem_flags & EFI_MEMORY_WT)
 494                 info->screen_base = memremap(efifb_fix.smem_start,
 495                                              efifb_fix.smem_len, MEMREMAP_WT);
 496         else if (mem_flags & EFI_MEMORY_WB)
 497                 info->screen_base = memremap(efifb_fix.smem_start,
 498                                              efifb_fix.smem_len, MEMREMAP_WB);
 499         if (!info->screen_base) {
 500                 pr_err("efifb: abort, cannot remap video memory 0x%x @ 0x%lx\n",
 501                         efifb_fix.smem_len, efifb_fix.smem_start);
 502                 err = -EIO;
 503                 goto err_release_fb;
 504         }
 505
 506         efifb_show_boot_graphics(info);
 507
 508         pr_info("efifb: framebuffer at 0x%lx, using %dk, total %dk\n",
 509                efifb_fix.smem_start, size_remap/1024, size_total/1024);
 510         pr_info("efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 511                efifb_defined.xres, efifb_defined.yres,
 512                efifb_defined.bits_per_pixel, efifb_fix.line_length,
 513                screen_info.pages);
 514
 515         efifb_defined.xres_virtual = efifb_defined.xres;
 516         efifb_defined.yres_virtual = efifb_fix.smem_len /
 517                                         efifb_fix.line_length;
 518         pr_info("efifb: scrolling: redraw\n");
 519         efifb_defined.yres_virtual = efifb_defined.yres;
 520
 521         /* some dummy values for timing to make fbset happy */
 522         efifb_defined.pixclock     = 10000000 / efifb_defined.xres *
 523                                         1000 / efifb_defined.yres;
 524         efifb_defined.left_margin  = (efifb_defined.xres / 8) & 0xf8;
 525         efifb_defined.hsync_len    = (efifb_defined.xres / 8) & 0xf8;
 526
 527         efifb_defined.red.offset    = screen_info.red_pos;
 528         efifb_defined.red.length    = screen_info.red_size;
 529         efifb_defined.green.offset  = screen_info.green_pos;
 530         efifb_defined.green.length  = screen_info.green_size;
 531         efifb_defined.blue.offset   = screen_info.blue_pos;
 532         efifb_defined.blue.length   = screen_info.blue_size;
 533         efifb_defined.transp.offset = screen_info.rsvd_pos;
 534         efifb_defined.transp.length = screen_info.rsvd_size;
 535
 536         pr_info("efifb: %s: "
 537                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 538                "Truecolor",
 539                screen_info.rsvd_size,
 540                screen_info.red_size,
 541                screen_info.green_size,
 542                screen_info.blue_size,
 543                screen_info.rsvd_pos,
 544                screen_info.red_pos,
 545                screen_info.green_pos,
 546                screen_info.blue_pos);
 547
 548         efifb_fix.ypanstep  = 0;
 549         efifb_fix.ywrapstep = 0;
 550
 551         info->fbops = &efifb_ops;
 552         info->var = efifb_defined;
 553         info->fix = efifb_fix;
 554         info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
 555
 556         orientation = drm_get_panel_orientation_quirk(efifb_defined.xres,
 557                                                       efifb_defined.yres);
 558         switch (orientation) {
 559         default:
 560                 info->fbcon_rotate_hint = FB_ROTATE_UR;
 561                 break;
 562         case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP:
 563                 info->fbcon_rotate_hint = FB_ROTATE_UD;
 564                 break;
 565         case DRM_MODE_PANEL_ORIENTATION_LEFT_UP:
 566                 info->fbcon_rotate_hint = FB_ROTATE_CCW;
 567                 break;
 568         case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP:
 569                 info->fbcon_rotate_hint = FB_ROTATE_CW;
 570                 break;
 571         }
 572
 573         err = sysfs_create_groups(&dev->dev.kobj, efifb_groups);
 574         if (err) {
 575                 pr_err("efifb: cannot add sysfs attrs\n");
 576                 goto err_unmap;
 577         }
 578         err = fb_alloc_cmap(&info->cmap, 256, 0);
 579         if (err < 0) {
 580                 pr_err("efifb: cannot allocate colormap\n");
 581                 goto err_groups;
 582         }
 583         err = register_framebuffer(info);
 584         if (err < 0) {
 585                 pr_err("efifb: cannot register framebuffer\n");
 586                 goto err_fb_dealoc;
 587         }
 588         fb_info(info, "%s frame buffer device\n", info->fix.id);
 589         return 0;
 590
 591 err_fb_dealoc:
 592         fb_dealloc_cmap(&info->cmap);
 593 err_groups:
 594         sysfs_remove_groups(&dev->dev.kobj, efifb_groups);
 595 err_unmap:
 596         if (mem_flags & (EFI_MEMORY_UC | EFI_MEMORY_WC))
 597                 iounmap(info->screen_base);
 598         else
 599                 memunmap(info->screen_base);
 600 err_release_fb:
 601         framebuffer_release(info);
 602 err_release_mem:
 603         if (request_mem_succeeded)
 604                 release_mem_region(efifb_fix.smem_start, size_total);
 605         return err;
 606 }
 607
 608 static int efifb_remove(struct platform_device *pdev)
 609 {
 610         struct fb_info *info = platform_get_drvdata(pdev);
 611
 612         unregister_framebuffer(info);
 613         sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
 614         framebuffer_release(info);
 615
 616         return 0;
 617 }
 618
 619 static struct platform_driver efifb_driver = {
 620         .driver = {
 621                 .name = "efi-framebuffer",
 622         },
 623         .probe = efifb_probe,
 624         .remove = efifb_remove,
 625 };
 626
 627 builtin_platform_driver(efifb_driver);
 628
 629 #if defined(CONFIG_PCI)
 630
 631 static void record_efifb_bar_resource(struct pci_dev *dev, int idx, u64 offset)
 632 {
 633         u16 word;
 634
 635         efifb_pci_dev = dev;
 636
 637         pci_read_config_word(dev, PCI_COMMAND, &word);
 638         if (!(word & PCI_COMMAND_MEMORY)) {
 639                 pci_dev_disabled = true;
 640                 dev_err(&dev->dev,
 641                         "BAR %d: assigned to efifb but device is disabled!\n",
 642                         idx);
 643                 return;
 644         }
 645
 646         bar_resource = &dev->resource[idx];
 647         bar_offset = offset;
 648
 649         dev_info(&dev->dev, "BAR %d: assigned to efifb\n", idx);
 650 }
 651
 652 static void efifb_fixup_resources(struct pci_dev *dev)
 653 {
 654         u64 base = screen_info.lfb_base;
 655         u64 size = screen_info.lfb_size;
 656         int i;
 657
 658         if (efifb_pci_dev || screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
 659                 return;
 660
 661         if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
 662                 base |= (u64)screen_info.ext_lfb_base << 32;
 663
 664         if (!base)
 665                 return;
 666
 667         for (i = 0; i <= PCI_STD_RESOURCE_END; i++) {
 668                 struct resource *res = &dev->resource[i];
 669
 670                 if (!(res->flags & IORESOURCE_MEM))
 671                         continue;
 672
 673                 if (res->start <= base && res->end >= base + size - 1) {
 674                         record_efifb_bar_resource(dev, i, base - res->start);
 675                         break;
 676                 }
 677         }
 678 }
 679 DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY,
 680                                16, efifb_fixup_resources);
 681
 682 #endif