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         if (bgrt_tab.status & 0x06) {
 173                 pr_info("efifb: BGRT rotation bits set, not showing boot graphics\n");
 174                 return;
 175         }
 176
 177         /* Avoid flashing the logo if we're going to print std probe messages */
 178         if (console_loglevel > CONSOLE_LOGLEVEL_QUIET)
 179                 return;
 180
 181         /* bgrt_tab.status is unreliable, so we don't check it */
 182
 183         if (si->lfb_depth != 32) {
 184                 pr_info("efifb: not 32 bits, not showing boot graphics\n");
 185                 return;
 186         }
 187
 188         bgrt_image = memremap(bgrt_tab.image_address, bgrt_image_size,
 189                               MEMREMAP_WB);
 190         if (!bgrt_image) {
 191                 pr_warn("efifb: Ignoring BGRT: failed to map image memory\n");
 192                 return;
 193         }
 194
 195         if (bgrt_image_size < (sizeof(*file_header) + sizeof(*dib_header)))
 196                 goto error;
 197
 198         file_header = bgrt_image;
 199         if (file_header->id != 0x4d42 || file_header->reserved != 0)
 200                 goto error;
 201
 202         dib_header = bgrt_image + sizeof(*file_header);
 203         if (dib_header->dib_header_size != 40 || dib_header->width < 0 ||
 204             dib_header->planes != 1 || dib_header->bpp != 24 ||
 205             dib_header->compression != 0)
 206                 goto error;
 207
 208         bmp_width = dib_header->width;
 209         bmp_height = abs(dib_header->height);
 210         bmp_pitch = round_up(3 * bmp_width, 4);
 211         screen_pitch = si->lfb_linelength;
 212
 213         if ((file_header->bitmap_offset + bmp_pitch * bmp_height) >
 214                                 bgrt_image_size)
 215                 goto error;
 216
 217         if ((bgrt_tab.image_offset_x + bmp_width) > si->lfb_width ||
 218             (bgrt_tab.image_offset_y + bmp_height) > si->lfb_height)
 219                 goto error;
 220
 221         if (!efifb_bgrt_sanity_check(si, bmp_width))
 222                 goto error;
 223
 224         pr_info("efifb: showing boot graphics\n");
 225
 226         for (y = 0; y < si->lfb_height; y++, dst += si->lfb_linelength) {
 227                 /* Only background? */
 228                 if (y < bgrt_tab.image_offset_y ||
 229                     y >= (bgrt_tab.image_offset_y + bmp_height)) {
 230                         memset(dst, 0, 4 * si->lfb_width);
 231                         continue;
 232                 }
 233
 234                 src_y = y - bgrt_tab.image_offset_y;
 235                 /* Positive header height means upside down row order */
 236                 if (dib_header->height > 0)
 237                         src_y = (bmp_height - 1) - src_y;
 238
 239                 memset(dst, 0, bgrt_tab.image_offset_x * 4);
 240                 dst_x = bgrt_tab.image_offset_x;
 241                 efifb_copy_bmp(bgrt_image + file_header->bitmap_offset +
 242                                             src_y * bmp_pitch,
 243                                (u32 *)dst + dst_x, bmp_width, si);
 244                 dst_x += bmp_width;
 245                 memset((u32 *)dst + dst_x, 0, (si->lfb_width - dst_x) * 4);
 246         }
 247
 248         memunmap(bgrt_image);
 249         return;
 250
 251 error:
 252         memunmap(bgrt_image);
 253         pr_warn("efifb: Ignoring BGRT: unexpected or invalid BMP data\n");
 254 }
 255 #else
 256 static inline void efifb_show_boot_graphics(struct fb_info *info) {}
 257 #endif
 258
 259 static void efifb_destroy(struct fb_info *info)
 260 {
 261         if (info->screen_base) {
 262                 if (mem_flags & (EFI_MEMORY_UC | EFI_MEMORY_WC))
 263                         iounmap(info->screen_base);
 264                 else
 265                         memunmap(info->screen_base);
 266         }
 267         if (request_mem_succeeded)
 268                 release_mem_region(info->apertures->ranges[0].base,
 269                                    info->apertures->ranges[0].size);
 270         fb_dealloc_cmap(&info->cmap);
 271 }
 272
 273 static struct fb_ops efifb_ops = {
 274         .owner          = THIS_MODULE,
 275         .fb_destroy     = efifb_destroy,
 276         .fb_setcolreg   = efifb_setcolreg,
 277         .fb_fillrect    = cfb_fillrect,
 278         .fb_copyarea    = cfb_copyarea,
 279         .fb_imageblit   = cfb_imageblit,
 280 };
 281
 282 static int efifb_setup(char *options)
 283 {
 284         char *this_opt;
 285
 286         if (options && *options) {
 287                 while ((this_opt = strsep(&options, ",")) != NULL) {
 288                         if (!*this_opt) continue;
 289
 290                         efifb_setup_from_dmi(&screen_info, this_opt);
 291
 292                         if (!strncmp(this_opt, "base:", 5))
 293                                 screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
 294                         else if (!strncmp(this_opt, "stride:", 7))
 295                                 screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
 296                         else if (!strncmp(this_opt, "height:", 7))
 297                                 screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
 298                         else if (!strncmp(this_opt, "width:", 6))
 299                                 screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
 300                         else if (!strcmp(this_opt, "nowc"))
 301                                 mem_flags &= ~EFI_MEMORY_WC;
 302                         else if (!strcmp(this_opt, "nobgrt"))
 303                                 use_bgrt = false;
 304                 }
 305         }
 306
 307         return 0;
 308 }
 309
 310 static inline bool fb_base_is_valid(void)
 311 {
 312         if (screen_info.lfb_base)
 313                 return true;
 314
 315         if (!(screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE))
 316                 return false;
 317
 318         if (screen_info.ext_lfb_base)
 319                 return true;
 320
 321         return false;
 322 }
 323
 324 #define efifb_attr_decl(name, fmt)                                      \
 325 static ssize_t name##_show(struct device *dev,                          \
 326                            struct device_attribute *attr,               \
 327                            char *buf)                                   \
 328 {                                                                       \
 329         return sprintf(buf, fmt "\n", (screen_info.lfb_##name));        \
 330 }                                                                       \
 331 static DEVICE_ATTR_RO(name)
 332
 333 efifb_attr_decl(base, "0x%x");
 334 efifb_attr_decl(linelength, "%u");
 335 efifb_attr_decl(height, "%u");
 336 efifb_attr_decl(width, "%u");
 337 efifb_attr_decl(depth, "%u");
 338
 339 static struct attribute *efifb_attrs[] = {
 340         &dev_attr_base.attr,
 341         &dev_attr_linelength.attr,
 342         &dev_attr_width.attr,
 343         &dev_attr_height.attr,
 344         &dev_attr_depth.attr,
 345         NULL
 346 };
 347 ATTRIBUTE_GROUPS(efifb);
 348
 349 static bool pci_dev_disabled;   /* FB base matches BAR of a disabled device */
 350
 351 static struct pci_dev *efifb_pci_dev;   /* dev with BAR covering the efifb */
 352 static struct resource *bar_resource;
 353 static u64 bar_offset;
 354
 355 static int efifb_probe(struct platform_device *dev)
 356 {
 357         struct fb_info *info;
 358         int err, orientation;
 359         unsigned int size_vmode;
 360         unsigned int size_remap;
 361         unsigned int size_total;
 362         char *option = NULL;
 363         efi_memory_desc_t md;
 364
 365         if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI || pci_dev_disabled)
 366                 return -ENODEV;
 367
 368         if (fb_get_options("efifb", &option))
 369                 return -ENODEV;
 370         efifb_setup(option);
 371
 372         /* We don't get linelength from UGA Draw Protocol, only from
 373          * EFI Graphics Protocol.  So if it's not in DMI, and it's not
 374          * passed in from the user, we really can't use the framebuffer.
 375          */
 376         if (!screen_info.lfb_linelength)
 377                 return -ENODEV;
 378
 379         if (!screen_info.lfb_depth)
 380                 screen_info.lfb_depth = 32;
 381         if (!screen_info.pages)
 382                 screen_info.pages = 1;
 383         if (!fb_base_is_valid()) {
 384                 printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
 385                 return -ENODEV;
 386         }
 387         printk(KERN_INFO "efifb: probing for efifb\n");
 388
 389         /* just assume they're all unset if any are */
 390         if (!screen_info.blue_size) {
 391                 screen_info.blue_size = 8;
 392                 screen_info.blue_pos = 0;
 393                 screen_info.green_size = 8;
 394                 screen_info.green_pos = 8;
 395                 screen_info.red_size = 8;
 396                 screen_info.red_pos = 16;
 397                 screen_info.rsvd_size = 8;
 398                 screen_info.rsvd_pos = 24;
 399         }
 400
 401         efifb_fix.smem_start = screen_info.lfb_base;
 402
 403         if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
 404                 u64 ext_lfb_base;
 405
 406                 ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;
 407                 efifb_fix.smem_start |= ext_lfb_base;
 408         }
 409
 410         if (bar_resource &&
 411             bar_resource->start + bar_offset != efifb_fix.smem_start) {
 412                 dev_info(&efifb_pci_dev->dev,
 413                          "BAR has moved, updating efifb address\n");
 414                 efifb_fix.smem_start = bar_resource->start + bar_offset;
 415         }
 416
 417         efifb_defined.bits_per_pixel = screen_info.lfb_depth;
 418         efifb_defined.xres = screen_info.lfb_width;
 419         efifb_defined.yres = screen_info.lfb_height;
 420         efifb_fix.line_length = screen_info.lfb_linelength;
 421
 422         /*   size_vmode -- that is the amount of memory needed for the
 423          *                 used video mode, i.e. the minimum amount of
 424          *                 memory we need. */
 425         size_vmode = efifb_defined.yres * efifb_fix.line_length;
 426
 427         /*   size_total -- all video memory we have. Used for
 428          *                 entries, ressource allocation and bounds
 429          *                 checking. */
 430         size_total = screen_info.lfb_size;
 431         if (size_total < size_vmode)
 432                 size_total = size_vmode;
 433
 434         /*   size_remap -- the amount of video memory we are going to
 435          *                 use for efifb.  With modern cards it is no
 436          *                 option to simply use size_total as that
 437          *                 wastes plenty of kernel address space. */
 438         size_remap  = size_vmode * 2;
 439         if (size_remap > size_total)
 440                 size_remap = size_total;
 441         if (size_remap % PAGE_SIZE)
 442                 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
 443         efifb_fix.smem_len = size_remap;
 444
 445         if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
 446                 request_mem_succeeded = true;
 447         } else {
 448                 /* We cannot make this fatal. Sometimes this comes from magic
 449                    spaces our resource handlers simply don't know about */
 450                 pr_warn("efifb: cannot reserve video memory at 0x%lx\n",
 451                         efifb_fix.smem_start);
 452         }
 453
 454         info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
 455         if (!info) {
 456                 err = -ENOMEM;
 457                 goto err_release_mem;
 458         }
 459         platform_set_drvdata(dev, info);
 460         info->pseudo_palette = info->par;
 461         info->par = NULL;
 462
 463         info->apertures = alloc_apertures(1);
 464         if (!info->apertures) {
 465                 err = -ENOMEM;
 466                 goto err_release_fb;
 467         }
 468         info->apertures->ranges[0].base = efifb_fix.smem_start;
 469         info->apertures->ranges[0].size = size_remap;
 470
 471         if (efi_enabled(EFI_BOOT) &&
 472             !efi_mem_desc_lookup(efifb_fix.smem_start, &md)) {
 473                 if ((efifb_fix.smem_start + efifb_fix.smem_len) >
 474                     (md.phys_addr + (md.num_pages << EFI_PAGE_SHIFT))) {
 475                         pr_err("efifb: video memory @ 0x%lx spans multiple EFI memory regions\n",
 476                                efifb_fix.smem_start);
 477                         err = -EIO;
 478                         goto err_release_fb;
 479                 }
 480                 /*
 481                  * If the UEFI memory map covers the efifb region, we may only
 482                  * remap it using the attributes the memory map prescribes.
 483                  */
 484                 md.attribute &= EFI_MEMORY_UC | EFI_MEMORY_WC |
 485                                 EFI_MEMORY_WT | EFI_MEMORY_WB;
 486                 if (md.attribute) {
 487                         mem_flags |= EFI_MEMORY_WT | EFI_MEMORY_WB;
 488                         mem_flags &= md.attribute;
 489                 }
 490         }
 491         if (mem_flags & EFI_MEMORY_WC)
 492                 info->screen_base = ioremap_wc(efifb_fix.smem_start,
 493                                                efifb_fix.smem_len);
 494         else if (mem_flags & EFI_MEMORY_UC)
 495                 info->screen_base = ioremap(efifb_fix.smem_start,
 496                                             efifb_fix.smem_len);
 497         else if (mem_flags & EFI_MEMORY_WT)
 498                 info->screen_base = memremap(efifb_fix.smem_start,
 499                                              efifb_fix.smem_len, MEMREMAP_WT);
 500         else if (mem_flags & EFI_MEMORY_WB)
 501                 info->screen_base = memremap(efifb_fix.smem_start,
 502                                              efifb_fix.smem_len, MEMREMAP_WB);
 503         if (!info->screen_base) {
 504                 pr_err("efifb: abort, cannot remap video memory 0x%x @ 0x%lx\n",
 505                         efifb_fix.smem_len, efifb_fix.smem_start);
 506                 err = -EIO;
 507                 goto err_release_fb;
 508         }
 509
 510         efifb_show_boot_graphics(info);
 511
 512         pr_info("efifb: framebuffer at 0x%lx, using %dk, total %dk\n",
 513                efifb_fix.smem_start, size_remap/1024, size_total/1024);
 514         pr_info("efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 515                efifb_defined.xres, efifb_defined.yres,
 516                efifb_defined.bits_per_pixel, efifb_fix.line_length,
 517                screen_info.pages);
 518
 519         efifb_defined.xres_virtual = efifb_defined.xres;
 520         efifb_defined.yres_virtual = efifb_fix.smem_len /
 521                                         efifb_fix.line_length;
 522         pr_info("efifb: scrolling: redraw\n");
 523         efifb_defined.yres_virtual = efifb_defined.yres;
 524
 525         /* some dummy values for timing to make fbset happy */
 526         efifb_defined.pixclock     = 10000000 / efifb_defined.xres *
 527                                         1000 / efifb_defined.yres;
 528         efifb_defined.left_margin  = (efifb_defined.xres / 8) & 0xf8;
 529         efifb_defined.hsync_len    = (efifb_defined.xres / 8) & 0xf8;
 530
 531         efifb_defined.red.offset    = screen_info.red_pos;
 532         efifb_defined.red.length    = screen_info.red_size;
 533         efifb_defined.green.offset  = screen_info.green_pos;
 534         efifb_defined.green.length  = screen_info.green_size;
 535         efifb_defined.blue.offset   = screen_info.blue_pos;
 536         efifb_defined.blue.length   = screen_info.blue_size;
 537         efifb_defined.transp.offset = screen_info.rsvd_pos;
 538         efifb_defined.transp.length = screen_info.rsvd_size;
 539
 540         pr_info("efifb: %s: "
 541                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 542                "Truecolor",
 543                screen_info.rsvd_size,
 544                screen_info.red_size,
 545                screen_info.green_size,
 546                screen_info.blue_size,
 547                screen_info.rsvd_pos,
 548                screen_info.red_pos,
 549                screen_info.green_pos,
 550                screen_info.blue_pos);
 551
 552         efifb_fix.ypanstep  = 0;
 553         efifb_fix.ywrapstep = 0;
 554
 555         info->fbops = &efifb_ops;
 556         info->var = efifb_defined;
 557         info->fix = efifb_fix;
 558         info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
 559
 560         orientation = drm_get_panel_orientation_quirk(efifb_defined.xres,
 561                                                       efifb_defined.yres);
 562         switch (orientation) {
 563         default:
 564                 info->fbcon_rotate_hint = FB_ROTATE_UR;
 565                 break;
 566         case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP:
 567                 info->fbcon_rotate_hint = FB_ROTATE_UD;
 568                 break;
 569         case DRM_MODE_PANEL_ORIENTATION_LEFT_UP:
 570                 info->fbcon_rotate_hint = FB_ROTATE_CCW;
 571                 break;
 572         case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP:
 573                 info->fbcon_rotate_hint = FB_ROTATE_CW;
 574                 break;
 575         }
 576
 577         err = sysfs_create_groups(&dev->dev.kobj, efifb_groups);
 578         if (err) {
 579                 pr_err("efifb: cannot add sysfs attrs\n");
 580                 goto err_unmap;
 581         }
 582         err = fb_alloc_cmap(&info->cmap, 256, 0);
 583         if (err < 0) {
 584                 pr_err("efifb: cannot allocate colormap\n");
 585                 goto err_groups;
 586         }
 587         err = register_framebuffer(info);
 588         if (err < 0) {
 589                 pr_err("efifb: cannot register framebuffer\n");
 590                 goto err_fb_dealoc;
 591         }
 592         fb_info(info, "%s frame buffer device\n", info->fix.id);
 593         return 0;
 594
 595 err_fb_dealoc:
 596         fb_dealloc_cmap(&info->cmap);
 597 err_groups:
 598         sysfs_remove_groups(&dev->dev.kobj, efifb_groups);
 599 err_unmap:
 600         if (mem_flags & (EFI_MEMORY_UC | EFI_MEMORY_WC))
 601                 iounmap(info->screen_base);
 602         else
 603                 memunmap(info->screen_base);
 604 err_release_fb:
 605         framebuffer_release(info);
 606 err_release_mem:
 607         if (request_mem_succeeded)
 608                 release_mem_region(efifb_fix.smem_start, size_total);
 609         return err;
 610 }
 611
 612 static int efifb_remove(struct platform_device *pdev)
 613 {
 614         struct fb_info *info = platform_get_drvdata(pdev);
 615
 616         unregister_framebuffer(info);
 617         sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
 618         framebuffer_release(info);
 619
 620         return 0;
 621 }
 622
 623 static struct platform_driver efifb_driver = {
 624         .driver = {
 625                 .name = "efi-framebuffer",
 626         },
 627         .probe = efifb_probe,
 628         .remove = efifb_remove,
 629 };
 630
 631 builtin_platform_driver(efifb_driver);
 632
 633 #if defined(CONFIG_PCI)
 634
 635 static void record_efifb_bar_resource(struct pci_dev *dev, int idx, u64 offset)
 636 {
 637         u16 word;
 638
 639         efifb_pci_dev = dev;
 640
 641         pci_read_config_word(dev, PCI_COMMAND, &word);
 642         if (!(word & PCI_COMMAND_MEMORY)) {
 643                 pci_dev_disabled = true;
 644                 dev_err(&dev->dev,
 645                         "BAR %d: assigned to efifb but device is disabled!\n",
 646                         idx);
 647                 return;
 648         }
 649
 650         bar_resource = &dev->resource[idx];
 651         bar_offset = offset;
 652
 653         dev_info(&dev->dev, "BAR %d: assigned to efifb\n", idx);
 654 }
 655
 656 static void efifb_fixup_resources(struct pci_dev *dev)
 657 {
 658         u64 base = screen_info.lfb_base;
 659         u64 size = screen_info.lfb_size;
 660         int i;
 661
 662         if (efifb_pci_dev || screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
 663                 return;
 664
 665         if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
 666                 base |= (u64)screen_info.ext_lfb_base << 32;
 667
 668         if (!base)
 669                 return;
 670
 671         for (i = 0; i <= PCI_STD_RESOURCE_END; i++) {
 672                 struct resource *res = &dev->resource[i];
 673
 674                 if (!(res->flags & IORESOURCE_MEM))
 675                         continue;
 676
 677                 if (res->start <= base && res->end >= base + size - 1) {
 678                         record_efifb_bar_resource(dev, i, base - res->start);
 679                         break;
 680                 }
 681         }
 682 }
 683 DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY,
 684                                16, efifb_fixup_resources);
 685
 686 #endif