drivers/video/fbdev/core/fbmem.c

   1 /*
   2  *  linux/drivers/video/fbmem.c
   3  *
   4  *  Copyright (C) 1994 Martin Schaller
   5  *
   6  *      2001 - Documented with DocBook
   7  *      - Brad Douglas <brad@neruo.com>
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License.  See the file COPYING in the main directory of this archive
  11  * for more details.
  12  */
  13
  14 #include <linux/module.h>
  15
  16 #include <linux/aperture.h>
  17 #include <linux/compat.h>
  18 #include <linux/types.h>
  19 #include <linux/errno.h>
  20 #include <linux/kernel.h>
  21 #include <linux/major.h>
  22 #include <linux/slab.h>
  23 #include <linux/mm.h>
  24 #include <linux/mman.h>
  25 #include <linux/vt.h>
  26 #include <linux/init.h>
  27 #include <linux/linux_logo.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/seq_file.h>
  31 #include <linux/console.h>
  32 #include <linux/kmod.h>
  33 #include <linux/err.h>
  34 #include <linux/device.h>
  35 #include <linux/efi.h>
  36 #include <linux/fb.h>
  37 #include <linux/fbcon.h>
  38 #include <linux/mem_encrypt.h>
  39 #include <linux/pci.h>
  40
  41 #include <asm/fb.h>
  42
  43 #include <video/nomodeset.h>
  44 #include <video/vga.h>
  45
  46     /*
  47      *  Frame buffer device initialization and setup routines
  48      */
  49
  50 #define FBPIXMAPSIZE    (1024 * 8)
  51
  52 static DEFINE_MUTEX(registration_lock);
  53
  54 struct fb_info *registered_fb[FB_MAX] __read_mostly;
  55 int num_registered_fb __read_mostly;
  56 #define for_each_registered_fb(i)               \
  57         for (i = 0; i < FB_MAX; i++)            \
  58                 if (!registered_fb[i]) {} else
  59
  60 bool fb_center_logo __read_mostly;
  61
  62 int fb_logo_count __read_mostly = -1;
  63
  64 static struct fb_info *get_fb_info(unsigned int idx)
  65 {
  66         struct fb_info *fb_info;
  67
  68         if (idx >= FB_MAX)
  69                 return ERR_PTR(-ENODEV);
  70
  71         mutex_lock(&registration_lock);
  72         fb_info = registered_fb[idx];
  73         if (fb_info)
  74                 refcount_inc(&fb_info->count);
  75         mutex_unlock(&registration_lock);
  76
  77         return fb_info;
  78 }
  79
  80 static void put_fb_info(struct fb_info *fb_info)
  81 {
  82         if (!refcount_dec_and_test(&fb_info->count))
  83                 return;
  84         if (fb_info->fbops->fb_destroy)
  85                 fb_info->fbops->fb_destroy(fb_info);
  86 }
  87
  88 /*
  89  * Helpers
  90  */
  91
  92 int fb_get_color_depth(struct fb_var_screeninfo *var,
  93                        struct fb_fix_screeninfo *fix)
  94 {
  95         int depth = 0;
  96
  97         if (fix->visual == FB_VISUAL_MONO01 ||
  98             fix->visual == FB_VISUAL_MONO10)
  99                 depth = 1;
 100         else {
 101                 if (var->green.length == var->blue.length &&
 102                     var->green.length == var->red.length &&
 103                     var->green.offset == var->blue.offset &&
 104                     var->green.offset == var->red.offset)
 105                         depth = var->green.length;
 106                 else
 107                         depth = var->green.length + var->red.length +
 108                                 var->blue.length;
 109         }
 110
 111         return depth;
 112 }
 113 EXPORT_SYMBOL(fb_get_color_depth);
 114
 115 /*
 116  * Data padding functions.
 117  */
 118 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
 119 {
 120         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
 121 }
 122 EXPORT_SYMBOL(fb_pad_aligned_buffer);
 123
 124 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
 125                                 u32 shift_high, u32 shift_low, u32 mod)
 126 {
 127         u8 mask = (u8) (0xfff << shift_high), tmp;
 128         int i, j;
 129
 130         for (i = height; i--; ) {
 131                 for (j = 0; j < idx; j++) {
 132                         tmp = dst[j];
 133                         tmp &= mask;
 134                         tmp |= *src >> shift_low;
 135                         dst[j] = tmp;
 136                         tmp = *src << shift_high;
 137                         dst[j+1] = tmp;
 138                         src++;
 139                 }
 140                 tmp = dst[idx];
 141                 tmp &= mask;
 142                 tmp |= *src >> shift_low;
 143                 dst[idx] = tmp;
 144                 if (shift_high < mod) {
 145                         tmp = *src << shift_high;
 146                         dst[idx+1] = tmp;
 147                 }
 148                 src++;
 149                 dst += d_pitch;
 150         }
 151 }
 152 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 153
 154 /*
 155  * we need to lock this section since fb_cursor
 156  * may use fb_imageblit()
 157  */
 158 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 159 {
 160         u32 align = buf->buf_align - 1, offset;
 161         char *addr = buf->addr;
 162
 163         /* If IO mapped, we need to sync before access, no sharing of
 164          * the pixmap is done
 165          */
 166         if (buf->flags & FB_PIXMAP_IO) {
 167                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 168                         info->fbops->fb_sync(info);
 169                 return addr;
 170         }
 171
 172         /* See if we fit in the remaining pixmap space */
 173         offset = buf->offset + align;
 174         offset &= ~align;
 175         if (offset + size > buf->size) {
 176                 /* We do not fit. In order to be able to re-use the buffer,
 177                  * we must ensure no asynchronous DMA'ing or whatever operation
 178                  * is in progress, we sync for that.
 179                  */
 180                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 181                         info->fbops->fb_sync(info);
 182                 offset = 0;
 183         }
 184         buf->offset = offset + size;
 185         addr += offset;
 186
 187         return addr;
 188 }
 189 EXPORT_SYMBOL(fb_get_buffer_offset);
 190
 191 #ifdef CONFIG_LOGO
 192
 193 static inline unsigned safe_shift(unsigned d, int n)
 194 {
 195         return n < 0 ? d >> -n : d << n;
 196 }
 197
 198 static void fb_set_logocmap(struct fb_info *info,
 199                                    const struct linux_logo *logo)
 200 {
 201         struct fb_cmap palette_cmap;
 202         u16 palette_green[16];
 203         u16 palette_blue[16];
 204         u16 palette_red[16];
 205         int i, j, n;
 206         const unsigned char *clut = logo->clut;
 207
 208         palette_cmap.start = 0;
 209         palette_cmap.len = 16;
 210         palette_cmap.red = palette_red;
 211         palette_cmap.green = palette_green;
 212         palette_cmap.blue = palette_blue;
 213         palette_cmap.transp = NULL;
 214
 215         for (i = 0; i < logo->clutsize; i += n) {
 216                 n = logo->clutsize - i;
 217                 /* palette_cmap provides space for only 16 colors at once */
 218                 if (n > 16)
 219                         n = 16;
 220                 palette_cmap.start = 32 + i;
 221                 palette_cmap.len = n;
 222                 for (j = 0; j < n; ++j) {
 223                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 224                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 225                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 226                         clut += 3;
 227                 }
 228                 fb_set_cmap(&palette_cmap, info);
 229         }
 230 }
 231
 232 static void  fb_set_logo_truepalette(struct fb_info *info,
 233                                             const struct linux_logo *logo,
 234                                             u32 *palette)
 235 {
 236         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 237         unsigned char redmask, greenmask, bluemask;
 238         int redshift, greenshift, blueshift;
 239         int i;
 240         const unsigned char *clut = logo->clut;
 241
 242         /*
 243          * We have to create a temporary palette since console palette is only
 244          * 16 colors long.
 245          */
 246         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 247         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 248         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 249         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 250         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 251         greenshift = info->var.green.offset - (8 - info->var.green.length);
 252         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 253
 254         for ( i = 0; i < logo->clutsize; i++) {
 255                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 256                                  safe_shift((clut[1] & greenmask), greenshift) |
 257                                  safe_shift((clut[2] & bluemask), blueshift));
 258                 clut += 3;
 259         }
 260 }
 261
 262 static void fb_set_logo_directpalette(struct fb_info *info,
 263                                              const struct linux_logo *logo,
 264                                              u32 *palette)
 265 {
 266         int redshift, greenshift, blueshift;
 267         int i;
 268
 269         redshift = info->var.red.offset;
 270         greenshift = info->var.green.offset;
 271         blueshift = info->var.blue.offset;
 272
 273         for (i = 32; i < 32 + logo->clutsize; i++)
 274                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 275 }
 276
 277 static void fb_set_logo(struct fb_info *info,
 278                                const struct linux_logo *logo, u8 *dst,
 279                                int depth)
 280 {
 281         int i, j, k;
 282         const u8 *src = logo->data;
 283         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 284         u8 fg = 1, d;
 285
 286         switch (fb_get_color_depth(&info->var, &info->fix)) {
 287         case 1:
 288                 fg = 1;
 289                 break;
 290         case 2:
 291                 fg = 3;
 292                 break;
 293         default:
 294                 fg = 7;
 295                 break;
 296         }
 297
 298         if (info->fix.visual == FB_VISUAL_MONO01 ||
 299             info->fix.visual == FB_VISUAL_MONO10)
 300                 fg = ~((u8) (0xfff << info->var.green.length));
 301
 302         switch (depth) {
 303         case 4:
 304                 for (i = 0; i < logo->height; i++)
 305                         for (j = 0; j < logo->width; src++) {
 306                                 *dst++ = *src >> 4;
 307                                 j++;
 308                                 if (j < logo->width) {
 309                                         *dst++ = *src & 0x0f;
 310                                         j++;
 311                                 }
 312                         }
 313                 break;
 314         case 1:
 315                 for (i = 0; i < logo->height; i++) {
 316                         for (j = 0; j < logo->width; src++) {
 317                                 d = *src ^ xor;
 318                                 for (k = 7; k >= 0 && j < logo->width; k--) {
 319                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 320                                         j++;
 321                                 }
 322                         }
 323                 }
 324                 break;
 325         }
 326 }
 327
 328 /*
 329  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 330  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 331  * the visual format and color depth of the framebuffer, the DAC, the
 332  * pseudo_palette, and the logo data will be adjusted accordingly.
 333  *
 334  * Case 1 - linux_logo_clut224:
 335  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 336  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 337  *
 338  * For visuals that require color info from the pseudo_palette, we also construct
 339  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 340  * will be set.
 341  *
 342  * Case 2 - linux_logo_vga16:
 343  * The number of colors just matches the console colors, thus there is no need
 344  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 345  * each byte contains color information for two pixels (upper and lower nibble).
 346  * To be consistent with fb_imageblit() usage, we therefore separate the two
 347  * nibbles into separate bytes. The "depth" flag will be set to 4.
 348  *
 349  * Case 3 - linux_logo_mono:
 350  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 351  * We isolate each bit and expand each into a byte. The "depth" flag will
 352  * be set to 1.
 353  */
 354 static struct logo_data {
 355         int depth;
 356         int needs_directpalette;
 357         int needs_truepalette;
 358         int needs_cmapreset;
 359         const struct linux_logo *logo;
 360 } fb_logo __read_mostly;
 361
 362 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 363 {
 364         u32 size = width * height, i;
 365
 366         out += size - 1;
 367
 368         for (i = size; i--; )
 369                 *out-- = *in++;
 370 }
 371
 372 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 373 {
 374         int i, j, h = height - 1;
 375
 376         for (i = 0; i < height; i++)
 377                 for (j = 0; j < width; j++)
 378                                 out[height * j + h - i] = *in++;
 379 }
 380
 381 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 382 {
 383         int i, j, w = width - 1;
 384
 385         for (i = 0; i < height; i++)
 386                 for (j = 0; j < width; j++)
 387                         out[height * (w - j) + i] = *in++;
 388 }
 389
 390 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 391                            struct fb_image *image, int rotate)
 392 {
 393         u32 tmp;
 394
 395         if (rotate == FB_ROTATE_UD) {
 396                 fb_rotate_logo_ud(image->data, dst, image->width,
 397                                   image->height);
 398                 image->dx = info->var.xres - image->width - image->dx;
 399                 image->dy = info->var.yres - image->height - image->dy;
 400         } else if (rotate == FB_ROTATE_CW) {
 401                 fb_rotate_logo_cw(image->data, dst, image->width,
 402                                   image->height);
 403                 swap(image->width, image->height);
 404                 tmp = image->dy;
 405                 image->dy = image->dx;
 406                 image->dx = info->var.xres - image->width - tmp;
 407         } else if (rotate == FB_ROTATE_CCW) {
 408                 fb_rotate_logo_ccw(image->data, dst, image->width,
 409                                    image->height);
 410                 swap(image->width, image->height);
 411                 tmp = image->dx;
 412                 image->dx = image->dy;
 413                 image->dy = info->var.yres - image->height - tmp;
 414         }
 415
 416         image->data = dst;
 417 }
 418
 419 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 420                             int rotate, unsigned int num)
 421 {
 422         unsigned int x;
 423
 424         if (image->width > info->var.xres || image->height > info->var.yres)
 425                 return;
 426
 427         if (rotate == FB_ROTATE_UR) {
 428                 for (x = 0;
 429                      x < num && image->dx + image->width <= info->var.xres;
 430                      x++) {
 431                         info->fbops->fb_imageblit(info, image);
 432                         image->dx += image->width + 8;
 433                 }
 434         } else if (rotate == FB_ROTATE_UD) {
 435                 u32 dx = image->dx;
 436
 437                 for (x = 0; x < num && image->dx <= dx; x++) {
 438                         info->fbops->fb_imageblit(info, image);
 439                         image->dx -= image->width + 8;
 440                 }
 441         } else if (rotate == FB_ROTATE_CW) {
 442                 for (x = 0;
 443                      x < num && image->dy + image->height <= info->var.yres;
 444                      x++) {
 445                         info->fbops->fb_imageblit(info, image);
 446                         image->dy += image->height + 8;
 447                 }
 448         } else if (rotate == FB_ROTATE_CCW) {
 449                 u32 dy = image->dy;
 450
 451                 for (x = 0; x < num && image->dy <= dy; x++) {
 452                         info->fbops->fb_imageblit(info, image);
 453                         image->dy -= image->height + 8;
 454                 }
 455         }
 456 }
 457
 458 static int fb_show_logo_line(struct fb_info *info, int rotate,
 459                              const struct linux_logo *logo, int y,
 460                              unsigned int n)
 461 {
 462         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 463         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 464         struct fb_image image;
 465
 466         /* Return if the frame buffer is not mapped or suspended */
 467         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
 468             info->fbops->owner)
 469                 return 0;
 470
 471         image.depth = 8;
 472         image.data = logo->data;
 473
 474         if (fb_logo.needs_cmapreset)
 475                 fb_set_logocmap(info, logo);
 476
 477         if (fb_logo.needs_truepalette ||
 478             fb_logo.needs_directpalette) {
 479                 palette = kmalloc(256 * 4, GFP_KERNEL);
 480                 if (palette == NULL)
 481                         return 0;
 482
 483                 if (fb_logo.needs_truepalette)
 484                         fb_set_logo_truepalette(info, logo, palette);
 485                 else
 486                         fb_set_logo_directpalette(info, logo, palette);
 487
 488                 saved_pseudo_palette = info->pseudo_palette;
 489                 info->pseudo_palette = palette;
 490         }
 491
 492         if (fb_logo.depth <= 4) {
 493                 logo_new = kmalloc_array(logo->width, logo->height,
 494                                          GFP_KERNEL);
 495                 if (logo_new == NULL) {
 496                         kfree(palette);
 497                         if (saved_pseudo_palette)
 498                                 info->pseudo_palette = saved_pseudo_palette;
 499                         return 0;
 500                 }
 501                 image.data = logo_new;
 502                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
 503         }
 504
 505         if (fb_center_logo) {
 506                 int xres = info->var.xres;
 507                 int yres = info->var.yres;
 508
 509                 if (rotate == FB_ROTATE_CW || rotate == FB_ROTATE_CCW) {
 510                         xres = info->var.yres;
 511                         yres = info->var.xres;
 512                 }
 513
 514                 while (n && (n * (logo->width + 8) - 8 > xres))
 515                         --n;
 516                 image.dx = (xres - (n * (logo->width + 8) - 8)) / 2;
 517                 image.dy = y ?: (yres - logo->height) / 2;
 518         } else {
 519                 image.dx = 0;
 520                 image.dy = y;
 521         }
 522
 523         image.width = logo->width;
 524         image.height = logo->height;
 525
 526         if (rotate) {
 527                 logo_rotate = kmalloc_array(logo->width, logo->height,
 528                                             GFP_KERNEL);
 529                 if (logo_rotate)
 530                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 531         }
 532
 533         fb_do_show_logo(info, &image, rotate, n);
 534
 535         kfree(palette);
 536         if (saved_pseudo_palette != NULL)
 537                 info->pseudo_palette = saved_pseudo_palette;
 538         kfree(logo_new);
 539         kfree(logo_rotate);
 540         return image.dy + logo->height;
 541 }
 542
 543
 544 #ifdef CONFIG_FB_LOGO_EXTRA
 545
 546 #define FB_LOGO_EX_NUM_MAX 10
 547 static struct logo_data_extra {
 548         const struct linux_logo *logo;
 549         unsigned int n;
 550 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
 551 static unsigned int fb_logo_ex_num;
 552
 553 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
 554 {
 555         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
 556                 return;
 557
 558         fb_logo_ex[fb_logo_ex_num].logo = logo;
 559         fb_logo_ex[fb_logo_ex_num].n = n;
 560         fb_logo_ex_num++;
 561 }
 562
 563 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
 564                                   unsigned int yres)
 565 {
 566         unsigned int i;
 567
 568         /* FIXME: logo_ex supports only truecolor fb. */
 569         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
 570                 fb_logo_ex_num = 0;
 571
 572         for (i = 0; i < fb_logo_ex_num; i++) {
 573                 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
 574                         fb_logo_ex[i].logo = NULL;
 575                         continue;
 576                 }
 577                 height += fb_logo_ex[i].logo->height;
 578                 if (height > yres) {
 579                         height -= fb_logo_ex[i].logo->height;
 580                         fb_logo_ex_num = i;
 581                         break;
 582                 }
 583         }
 584         return height;
 585 }
 586
 587 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 588 {
 589         unsigned int i;
 590
 591         for (i = 0; i < fb_logo_ex_num; i++)
 592                 y = fb_show_logo_line(info, rotate,
 593                                       fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
 594
 595         return y;
 596 }
 597
 598 #else /* !CONFIG_FB_LOGO_EXTRA */
 599
 600 static inline int fb_prepare_extra_logos(struct fb_info *info,
 601                                          unsigned int height,
 602                                          unsigned int yres)
 603 {
 604         return height;
 605 }
 606
 607 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 608 {
 609         return y;
 610 }
 611
 612 #endif /* CONFIG_FB_LOGO_EXTRA */
 613
 614
 615 int fb_prepare_logo(struct fb_info *info, int rotate)
 616 {
 617         int depth = fb_get_color_depth(&info->var, &info->fix);
 618         unsigned int yres;
 619         int height;
 620
 621         memset(&fb_logo, 0, sizeof(struct logo_data));
 622
 623         if (info->flags & FBINFO_MISC_TILEBLITTING ||
 624             info->fbops->owner || !fb_logo_count)
 625                 return 0;
 626
 627         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 628                 depth = info->var.blue.length;
 629                 if (info->var.red.length < depth)
 630                         depth = info->var.red.length;
 631                 if (info->var.green.length < depth)
 632                         depth = info->var.green.length;
 633         }
 634
 635         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 636                 /* assume console colormap */
 637                 depth = 4;
 638         }
 639
 640         /* Return if no suitable logo was found */
 641         fb_logo.logo = fb_find_logo(depth);
 642
 643         if (!fb_logo.logo) {
 644                 return 0;
 645         }
 646
 647         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 648                 yres = info->var.yres;
 649         else
 650                 yres = info->var.xres;
 651
 652         if (fb_logo.logo->height > yres) {
 653                 fb_logo.logo = NULL;
 654                 return 0;
 655         }
 656
 657         /* What depth we asked for might be different from what we get */
 658         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 659                 fb_logo.depth = 8;
 660         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 661                 fb_logo.depth = 4;
 662         else
 663                 fb_logo.depth = 1;
 664
 665
 666         if (fb_logo.depth > 4 && depth > 4) {
 667                 switch (info->fix.visual) {
 668                 case FB_VISUAL_TRUECOLOR:
 669                         fb_logo.needs_truepalette = 1;
 670                         break;
 671                 case FB_VISUAL_DIRECTCOLOR:
 672                         fb_logo.needs_directpalette = 1;
 673                         fb_logo.needs_cmapreset = 1;
 674                         break;
 675                 case FB_VISUAL_PSEUDOCOLOR:
 676                         fb_logo.needs_cmapreset = 1;
 677                         break;
 678                 }
 679         }
 680
 681         height = fb_logo.logo->height;
 682         if (fb_center_logo)
 683                 height += (yres - fb_logo.logo->height) / 2;
 684
 685         return fb_prepare_extra_logos(info, height, yres);
 686 }
 687
 688 int fb_show_logo(struct fb_info *info, int rotate)
 689 {
 690         unsigned int count;
 691         int y;
 692
 693         if (!fb_logo_count)
 694                 return 0;
 695
 696         count = fb_logo_count < 0 ? num_online_cpus() : fb_logo_count;
 697         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0, count);
 698         y = fb_show_extra_logos(info, y, rotate);
 699
 700         return y;
 701 }
 702 #else
 703 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 704 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 705 #endif /* CONFIG_LOGO */
 706 EXPORT_SYMBOL(fb_prepare_logo);
 707 EXPORT_SYMBOL(fb_show_logo);
 708
 709 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
 710 {
 711         mutex_lock(&registration_lock);
 712         return (*pos < FB_MAX) ? pos : NULL;
 713 }
 714
 715 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
 716 {
 717         (*pos)++;
 718         return (*pos < FB_MAX) ? pos : NULL;
 719 }
 720
 721 static void fb_seq_stop(struct seq_file *m, void *v)
 722 {
 723         mutex_unlock(&registration_lock);
 724 }
 725
 726 static int fb_seq_show(struct seq_file *m, void *v)
 727 {
 728         int i = *(loff_t *)v;
 729         struct fb_info *fi = registered_fb[i];
 730
 731         if (fi)
 732                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
 733         return 0;
 734 }
 735
 736 static const struct seq_operations __maybe_unused proc_fb_seq_ops = {
 737         .start  = fb_seq_start,
 738         .next   = fb_seq_next,
 739         .stop   = fb_seq_stop,
 740         .show   = fb_seq_show,
 741 };
 742
 743 /*
 744  * We hold a reference to the fb_info in file->private_data,
 745  * but if the current registered fb has changed, we don't
 746  * actually want to use it.
 747  *
 748  * So look up the fb_info using the inode minor number,
 749  * and just verify it against the reference we have.
 750  */
 751 static struct fb_info *file_fb_info(struct file *file)
 752 {
 753         struct inode *inode = file_inode(file);
 754         int fbidx = iminor(inode);
 755         struct fb_info *info = registered_fb[fbidx];
 756
 757         if (info != file->private_data)
 758                 info = NULL;
 759         return info;
 760 }
 761
 762 static ssize_t
 763 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 764 {
 765         unsigned long p = *ppos;
 766         struct fb_info *info = file_fb_info(file);
 767         u8 *buffer, *dst;
 768         u8 __iomem *src;
 769         int c, cnt = 0, err = 0;
 770         unsigned long total_size;
 771
 772         if (!info || ! info->screen_base)
 773                 return -ENODEV;
 774
 775         if (info->state != FBINFO_STATE_RUNNING)
 776                 return -EPERM;
 777
 778         if (info->fbops->fb_read)
 779                 return info->fbops->fb_read(info, buf, count, ppos);
 780
 781         total_size = info->screen_size;
 782
 783         if (total_size == 0)
 784                 total_size = info->fix.smem_len;
 785
 786         if (p >= total_size)
 787                 return 0;
 788
 789         if (count >= total_size)
 790                 count = total_size;
 791
 792         if (count + p > total_size)
 793                 count = total_size - p;
 794
 795         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 796                          GFP_KERNEL);
 797         if (!buffer)
 798                 return -ENOMEM;
 799
 800         src = (u8 __iomem *) (info->screen_base + p);
 801
 802         if (info->fbops->fb_sync)
 803                 info->fbops->fb_sync(info);
 804
 805         while (count) {
 806                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 807                 dst = buffer;
 808                 fb_memcpy_fromfb(dst, src, c);
 809                 dst += c;
 810                 src += c;
 811
 812                 if (copy_to_user(buf, buffer, c)) {
 813                         err = -EFAULT;
 814                         break;
 815                 }
 816                 *ppos += c;
 817                 buf += c;
 818                 cnt += c;
 819                 count -= c;
 820         }
 821
 822         kfree(buffer);
 823
 824         return (err) ? err : cnt;
 825 }
 826
 827 static ssize_t
 828 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 829 {
 830         unsigned long p = *ppos;
 831         struct fb_info *info = file_fb_info(file);
 832         u8 *buffer, *src;
 833         u8 __iomem *dst;
 834         int c, cnt = 0, err = 0;
 835         unsigned long total_size;
 836
 837         if (!info || !info->screen_base)
 838                 return -ENODEV;
 839
 840         if (info->state != FBINFO_STATE_RUNNING)
 841                 return -EPERM;
 842
 843         if (info->fbops->fb_write)
 844                 return info->fbops->fb_write(info, buf, count, ppos);
 845
 846         total_size = info->screen_size;
 847
 848         if (total_size == 0)
 849                 total_size = info->fix.smem_len;
 850
 851         if (p > total_size)
 852                 return -EFBIG;
 853
 854         if (count > total_size) {
 855                 err = -EFBIG;
 856                 count = total_size;
 857         }
 858
 859         if (count + p > total_size) {
 860                 if (!err)
 861                         err = -ENOSPC;
 862
 863                 count = total_size - p;
 864         }
 865
 866         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 867                          GFP_KERNEL);
 868         if (!buffer)
 869                 return -ENOMEM;
 870
 871         dst = (u8 __iomem *) (info->screen_base + p);
 872
 873         if (info->fbops->fb_sync)
 874                 info->fbops->fb_sync(info);
 875
 876         while (count) {
 877                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 878                 src = buffer;
 879
 880                 if (copy_from_user(src, buf, c)) {
 881                         err = -EFAULT;
 882                         break;
 883                 }
 884
 885                 fb_memcpy_tofb(dst, src, c);
 886                 dst += c;
 887                 src += c;
 888                 *ppos += c;
 889                 buf += c;
 890                 cnt += c;
 891                 count -= c;
 892         }
 893
 894         kfree(buffer);
 895
 896         return (cnt) ? cnt : err;
 897 }
 898
 899 int
 900 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 901 {
 902         struct fb_fix_screeninfo *fix = &info->fix;
 903         unsigned int yres = info->var.yres;
 904         int err = 0;
 905
 906         if (var->yoffset > 0) {
 907                 if (var->vmode & FB_VMODE_YWRAP) {
 908                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 909                                 err = -EINVAL;
 910                         else
 911                                 yres = 0;
 912                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 913                         err = -EINVAL;
 914         }
 915
 916         if (var->xoffset > 0 && (!fix->xpanstep ||
 917                                  (var->xoffset % fix->xpanstep)))
 918                 err = -EINVAL;
 919
 920         if (err || !info->fbops->fb_pan_display ||
 921             var->yoffset > info->var.yres_virtual - yres ||
 922             var->xoffset > info->var.xres_virtual - info->var.xres)
 923                 return -EINVAL;
 924
 925         if ((err = info->fbops->fb_pan_display(var, info)))
 926                 return err;
 927         info->var.xoffset = var->xoffset;
 928         info->var.yoffset = var->yoffset;
 929         if (var->vmode & FB_VMODE_YWRAP)
 930                 info->var.vmode |= FB_VMODE_YWRAP;
 931         else
 932                 info->var.vmode &= ~FB_VMODE_YWRAP;
 933         return 0;
 934 }
 935 EXPORT_SYMBOL(fb_pan_display);
 936
 937 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
 938                          u32 activate)
 939 {
 940         struct fb_blit_caps caps, fbcaps;
 941         int err = 0;
 942
 943         memset(&caps, 0, sizeof(caps));
 944         memset(&fbcaps, 0, sizeof(fbcaps));
 945         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
 946         fbcon_get_requirement(info, &caps);
 947         info->fbops->fb_get_caps(info, &fbcaps, var);
 948
 949         if (((fbcaps.x ^ caps.x) & caps.x) ||
 950             ((fbcaps.y ^ caps.y) & caps.y) ||
 951             (fbcaps.len < caps.len))
 952                 err = -EINVAL;
 953
 954         return err;
 955 }
 956
 957 int
 958 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 959 {
 960         int ret = 0;
 961         u32 activate;
 962         struct fb_var_screeninfo old_var;
 963         struct fb_videomode mode;
 964         struct fb_event event;
 965         u32 unused;
 966
 967         if (var->activate & FB_ACTIVATE_INV_MODE) {
 968                 struct fb_videomode mode1, mode2;
 969
 970                 fb_var_to_videomode(&mode1, var);
 971                 fb_var_to_videomode(&mode2, &info->var);
 972                 /* make sure we don't delete the videomode of current var */
 973                 ret = fb_mode_is_equal(&mode1, &mode2);
 974                 if (!ret) {
 975                         ret = fbcon_mode_deleted(info, &mode1);
 976                         if (!ret)
 977                                 fb_delete_videomode(&mode1, &info->modelist);
 978                 }
 979
 980                 return ret ? -EINVAL : 0;
 981         }
 982
 983         if (!(var->activate & FB_ACTIVATE_FORCE) &&
 984             !memcmp(&info->var, var, sizeof(struct fb_var_screeninfo)))
 985                 return 0;
 986
 987         activate = var->activate;
 988
 989         /* When using FOURCC mode, make sure the red, green, blue and
 990          * transp fields are set to 0.
 991          */
 992         if ((info->fix.capabilities & FB_CAP_FOURCC) &&
 993             var->grayscale > 1) {
 994                 if (var->red.offset     || var->green.offset    ||
 995                     var->blue.offset    || var->transp.offset   ||
 996                     var->red.length     || var->green.length    ||
 997                     var->blue.length    || var->transp.length   ||
 998                     var->red.msb_right  || var->green.msb_right ||
 999                     var->blue.msb_right || var->transp.msb_right)
1000                         return -EINVAL;
1001         }
1002
1003         if (!info->fbops->fb_check_var) {
1004                 *var = info->var;
1005                 return 0;
1006         }
1007
1008         /* bitfill_aligned() assumes that it's at least 8x8 */
1009         if (var->xres < 8 || var->yres < 8)
1010                 return -EINVAL;
1011
1012         /* Too huge resolution causes multiplication overflow. */
1013         if (check_mul_overflow(var->xres, var->yres, &unused) ||
1014             check_mul_overflow(var->xres_virtual, var->yres_virtual, &unused))
1015                 return -EINVAL;
1016
1017         ret = info->fbops->fb_check_var(var, info);
1018
1019         if (ret)
1020                 return ret;
1021
1022         /* verify that virtual resolution >= physical resolution */
1023         if (var->xres_virtual < var->xres ||
1024             var->yres_virtual < var->yres) {
1025                 pr_warn("WARNING: fbcon: Driver '%s' missed to adjust virtual screen size (%ux%u vs. %ux%u)\n",
1026                         info->fix.id,
1027                         var->xres_virtual, var->yres_virtual,
1028                         var->xres, var->yres);
1029                 return -EINVAL;
1030         }
1031
1032         if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW)
1033                 return 0;
1034
1035         if (info->fbops->fb_get_caps) {
1036                 ret = fb_check_caps(info, var, activate);
1037
1038                 if (ret)
1039                         return ret;
1040         }
1041
1042         old_var = info->var;
1043         info->var = *var;
1044
1045         if (info->fbops->fb_set_par) {
1046                 ret = info->fbops->fb_set_par(info);
1047
1048                 if (ret) {
1049                         info->var = old_var;
1050                         printk(KERN_WARNING "detected "
1051                                 "fb_set_par error, "
1052                                 "error code: %d\n", ret);
1053                         return ret;
1054                 }
1055         }
1056
1057         fb_pan_display(info, &info->var);
1058         fb_set_cmap(&info->cmap, info);
1059         fb_var_to_videomode(&mode, &info->var);
1060
1061         if (info->modelist.prev && info->modelist.next &&
1062             !list_empty(&info->modelist))
1063                 ret = fb_add_videomode(&mode, &info->modelist);
1064
1065         if (ret)
1066                 return ret;
1067
1068         event.info = info;
1069         event.data = &mode;
1070         fb_notifier_call_chain(FB_EVENT_MODE_CHANGE, &event);
1071
1072         return 0;
1073 }
1074 EXPORT_SYMBOL(fb_set_var);
1075
1076 int
1077 fb_blank(struct fb_info *info, int blank)
1078 {
1079         struct fb_event event;
1080         int ret = -EINVAL;
1081
1082         if (blank > FB_BLANK_POWERDOWN)
1083                 blank = FB_BLANK_POWERDOWN;
1084
1085         event.info = info;
1086         event.data = &blank;
1087
1088         if (info->fbops->fb_blank)
1089                 ret = info->fbops->fb_blank(blank, info);
1090
1091         if (!ret)
1092                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1093
1094         return ret;
1095 }
1096 EXPORT_SYMBOL(fb_blank);
1097
1098 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1099                         unsigned long arg)
1100 {
1101         const struct fb_ops *fb;
1102         struct fb_var_screeninfo var;
1103         struct fb_fix_screeninfo fix;
1104         struct fb_cmap cmap_from;
1105         struct fb_cmap_user cmap;
1106         void __user *argp = (void __user *)arg;
1107         long ret = 0;
1108
1109         switch (cmd) {
1110         case FBIOGET_VSCREENINFO:
1111                 lock_fb_info(info);
1112                 var = info->var;
1113                 unlock_fb_info(info);
1114
1115                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1116                 break;
1117         case FBIOPUT_VSCREENINFO:
1118                 if (copy_from_user(&var, argp, sizeof(var)))
1119                         return -EFAULT;
1120                 console_lock();
1121                 lock_fb_info(info);
1122                 ret = fbcon_modechange_possible(info, &var);
1123                 if (!ret)
1124                         ret = fb_set_var(info, &var);
1125                 if (!ret)
1126                         fbcon_update_vcs(info, var.activate & FB_ACTIVATE_ALL);
1127                 unlock_fb_info(info);
1128                 console_unlock();
1129                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1130                         ret = -EFAULT;
1131                 break;
1132         case FBIOGET_FSCREENINFO:
1133                 lock_fb_info(info);
1134                 memcpy(&fix, &info->fix, sizeof(fix));
1135                 if (info->flags & FBINFO_HIDE_SMEM_START)
1136                         fix.smem_start = 0;
1137                 unlock_fb_info(info);
1138
1139                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1140                 break;
1141         case FBIOPUTCMAP:
1142                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1143                         return -EFAULT;
1144                 ret = fb_set_user_cmap(&cmap, info);
1145                 break;
1146         case FBIOGETCMAP:
1147                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1148                         return -EFAULT;
1149                 lock_fb_info(info);
1150                 cmap_from = info->cmap;
1151                 unlock_fb_info(info);
1152                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1153                 break;
1154         case FBIOPAN_DISPLAY:
1155                 if (copy_from_user(&var, argp, sizeof(var)))
1156                         return -EFAULT;
1157                 console_lock();
1158                 lock_fb_info(info);
1159                 ret = fb_pan_display(info, &var);
1160                 unlock_fb_info(info);
1161                 console_unlock();
1162                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1163                         return -EFAULT;
1164                 break;
1165         case FBIO_CURSOR:
1166                 ret = -EINVAL;
1167                 break;
1168         case FBIOGET_CON2FBMAP:
1169                 ret = fbcon_get_con2fb_map_ioctl(argp);
1170                 break;
1171         case FBIOPUT_CON2FBMAP:
1172                 ret = fbcon_set_con2fb_map_ioctl(argp);
1173                 break;
1174         case FBIOBLANK:
1175                 if (arg > FB_BLANK_POWERDOWN)
1176                         return -EINVAL;
1177                 console_lock();
1178                 lock_fb_info(info);
1179                 ret = fb_blank(info, arg);
1180                 /* might again call into fb_blank */
1181                 fbcon_fb_blanked(info, arg);
1182                 unlock_fb_info(info);
1183                 console_unlock();
1184                 break;
1185         default:
1186                 lock_fb_info(info);
1187                 fb = info->fbops;
1188                 if (fb->fb_ioctl)
1189                         ret = fb->fb_ioctl(info, cmd, arg);
1190                 else
1191                         ret = -ENOTTY;
1192                 unlock_fb_info(info);
1193         }
1194         return ret;
1195 }
1196
1197 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1198 {
1199         struct fb_info *info = file_fb_info(file);
1200
1201         if (!info)
1202                 return -ENODEV;
1203         return do_fb_ioctl(info, cmd, arg);
1204 }
1205
1206 #ifdef CONFIG_COMPAT
1207 struct fb_fix_screeninfo32 {
1208         char                    id[16];
1209         compat_caddr_t          smem_start;
1210         u32                     smem_len;
1211         u32                     type;
1212         u32                     type_aux;
1213         u32                     visual;
1214         u16                     xpanstep;
1215         u16                     ypanstep;
1216         u16                     ywrapstep;
1217         u32                     line_length;
1218         compat_caddr_t          mmio_start;
1219         u32                     mmio_len;
1220         u32                     accel;
1221         u16                     reserved[3];
1222 };
1223
1224 struct fb_cmap32 {
1225         u32                     start;
1226         u32                     len;
1227         compat_caddr_t  red;
1228         compat_caddr_t  green;
1229         compat_caddr_t  blue;
1230         compat_caddr_t  transp;
1231 };
1232
1233 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1234                           unsigned long arg)
1235 {
1236         struct fb_cmap32 cmap32;
1237         struct fb_cmap cmap_from;
1238         struct fb_cmap_user cmap;
1239
1240         if (copy_from_user(&cmap32, compat_ptr(arg), sizeof(cmap32)))
1241                 return -EFAULT;
1242
1243         cmap = (struct fb_cmap_user) {
1244                 .start  = cmap32.start,
1245                 .len    = cmap32.len,
1246                 .red    = compat_ptr(cmap32.red),
1247                 .green  = compat_ptr(cmap32.green),
1248                 .blue   = compat_ptr(cmap32.blue),
1249                 .transp = compat_ptr(cmap32.transp),
1250         };
1251
1252         if (cmd == FBIOPUTCMAP)
1253                 return fb_set_user_cmap(&cmap, info);
1254
1255         lock_fb_info(info);
1256         cmap_from = info->cmap;
1257         unlock_fb_info(info);
1258
1259         return fb_cmap_to_user(&cmap_from, &cmap);
1260 }
1261
1262 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1263                                   struct fb_fix_screeninfo32 __user *fix32)
1264 {
1265         __u32 data;
1266         int err;
1267
1268         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1269
1270         data = (__u32) (unsigned long) fix->smem_start;
1271         err |= put_user(data, &fix32->smem_start);
1272
1273         err |= put_user(fix->smem_len, &fix32->smem_len);
1274         err |= put_user(fix->type, &fix32->type);
1275         err |= put_user(fix->type_aux, &fix32->type_aux);
1276         err |= put_user(fix->visual, &fix32->visual);
1277         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1278         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1279         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1280         err |= put_user(fix->line_length, &fix32->line_length);
1281
1282         data = (__u32) (unsigned long) fix->mmio_start;
1283         err |= put_user(data, &fix32->mmio_start);
1284
1285         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1286         err |= put_user(fix->accel, &fix32->accel);
1287         err |= copy_to_user(fix32->reserved, fix->reserved,
1288                             sizeof(fix->reserved));
1289
1290         if (err)
1291                 return -EFAULT;
1292         return 0;
1293 }
1294
1295 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1296                               unsigned long arg)
1297 {
1298         struct fb_fix_screeninfo fix;
1299
1300         lock_fb_info(info);
1301         fix = info->fix;
1302         if (info->flags & FBINFO_HIDE_SMEM_START)
1303                 fix.smem_start = 0;
1304         unlock_fb_info(info);
1305         return do_fscreeninfo_to_user(&fix, compat_ptr(arg));
1306 }
1307
1308 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1309                             unsigned long arg)
1310 {
1311         struct fb_info *info = file_fb_info(file);
1312         const struct fb_ops *fb;
1313         long ret = -ENOIOCTLCMD;
1314
1315         if (!info)
1316                 return -ENODEV;
1317         fb = info->fbops;
1318         switch(cmd) {
1319         case FBIOGET_VSCREENINFO:
1320         case FBIOPUT_VSCREENINFO:
1321         case FBIOPAN_DISPLAY:
1322         case FBIOGET_CON2FBMAP:
1323         case FBIOPUT_CON2FBMAP:
1324                 arg = (unsigned long) compat_ptr(arg);
1325                 fallthrough;
1326         case FBIOBLANK:
1327                 ret = do_fb_ioctl(info, cmd, arg);
1328                 break;
1329
1330         case FBIOGET_FSCREENINFO:
1331                 ret = fb_get_fscreeninfo(info, cmd, arg);
1332                 break;
1333
1334         case FBIOGETCMAP:
1335         case FBIOPUTCMAP:
1336                 ret = fb_getput_cmap(info, cmd, arg);
1337                 break;
1338
1339         default:
1340                 if (fb->fb_compat_ioctl)
1341                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1342                 break;
1343         }
1344         return ret;
1345 }
1346 #endif
1347
1348 static int
1349 fb_mmap(struct file *file, struct vm_area_struct * vma)
1350 {
1351         struct fb_info *info = file_fb_info(file);
1352         unsigned long mmio_pgoff;
1353         unsigned long start;
1354         u32 len;
1355
1356         if (!info)
1357                 return -ENODEV;
1358         mutex_lock(&info->mm_lock);
1359
1360         if (info->fbops->fb_mmap) {
1361                 int res;
1362
1363                 /*
1364                  * The framebuffer needs to be accessed decrypted, be sure
1365                  * SME protection is removed ahead of the call
1366                  */
1367                 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1368                 res = info->fbops->fb_mmap(info, vma);
1369                 mutex_unlock(&info->mm_lock);
1370                 return res;
1371 #if IS_ENABLED(CONFIG_FB_DEFERRED_IO)
1372         } else if (info->fbdefio) {
1373                 /*
1374                  * FB deferred I/O wants you to handle mmap in your drivers. At a
1375                  * minimum, point struct fb_ops.fb_mmap to fb_deferred_io_mmap().
1376                  */
1377                 dev_warn_once(info->dev, "fbdev mmap not set up for deferred I/O.\n");
1378                 mutex_unlock(&info->mm_lock);
1379                 return -ENODEV;
1380 #endif
1381         }
1382
1383         /*
1384          * Ugh. This can be either the frame buffer mapping, or
1385          * if pgoff points past it, the mmio mapping.
1386          */
1387         start = info->fix.smem_start;
1388         len = info->fix.smem_len;
1389         mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1390         if (vma->vm_pgoff >= mmio_pgoff) {
1391                 if (info->var.accel_flags) {
1392                         mutex_unlock(&info->mm_lock);
1393                         return -EINVAL;
1394                 }
1395
1396                 vma->vm_pgoff -= mmio_pgoff;
1397                 start = info->fix.mmio_start;
1398                 len = info->fix.mmio_len;
1399         }
1400         mutex_unlock(&info->mm_lock);
1401
1402         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1403         fb_pgprotect(file, vma, start);
1404
1405         return vm_iomap_memory(vma, start, len);
1406 }
1407
1408 static int
1409 fb_open(struct inode *inode, struct file *file)
1410 __acquires(&info->lock)
1411 __releases(&info->lock)
1412 {
1413         int fbidx = iminor(inode);
1414         struct fb_info *info;
1415         int res = 0;
1416
1417         info = get_fb_info(fbidx);
1418         if (!info) {
1419                 request_module("fb%d", fbidx);
1420                 info = get_fb_info(fbidx);
1421                 if (!info)
1422                         return -ENODEV;
1423         }
1424         if (IS_ERR(info))
1425                 return PTR_ERR(info);
1426
1427         lock_fb_info(info);
1428         if (!try_module_get(info->fbops->owner)) {
1429                 res = -ENODEV;
1430                 goto out;
1431         }
1432         file->private_data = info;
1433         if (info->fbops->fb_open) {
1434                 res = info->fbops->fb_open(info,1);
1435                 if (res)
1436                         module_put(info->fbops->owner);
1437         }
1438 #ifdef CONFIG_FB_DEFERRED_IO
1439         if (info->fbdefio)
1440                 fb_deferred_io_open(info, inode, file);
1441 #endif
1442 out:
1443         unlock_fb_info(info);
1444         if (res)
1445                 put_fb_info(info);
1446         return res;
1447 }
1448
1449 static int
1450 fb_release(struct inode *inode, struct file *file)
1451 __acquires(&info->lock)
1452 __releases(&info->lock)
1453 {
1454         struct fb_info * const info = file->private_data;
1455
1456         lock_fb_info(info);
1457         if (info->fbops->fb_release)
1458                 info->fbops->fb_release(info,1);
1459         module_put(info->fbops->owner);
1460         unlock_fb_info(info);
1461         put_fb_info(info);
1462         return 0;
1463 }
1464
1465 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU)
1466 unsigned long get_fb_unmapped_area(struct file *filp,
1467                                    unsigned long addr, unsigned long len,
1468                                    unsigned long pgoff, unsigned long flags)
1469 {
1470         struct fb_info * const info = filp->private_data;
1471         unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
1472
1473         if (pgoff > fb_size || len > fb_size - pgoff)
1474                 return -EINVAL;
1475
1476         return (unsigned long)info->screen_base + pgoff;
1477 }
1478 #endif
1479
1480 static const struct file_operations fb_fops = {
1481         .owner =        THIS_MODULE,
1482         .read =         fb_read,
1483         .write =        fb_write,
1484         .unlocked_ioctl = fb_ioctl,
1485 #ifdef CONFIG_COMPAT
1486         .compat_ioctl = fb_compat_ioctl,
1487 #endif
1488         .mmap =         fb_mmap,
1489         .open =         fb_open,
1490         .release =      fb_release,
1491 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \
1492         (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \
1493          !defined(CONFIG_MMU))
1494         .get_unmapped_area = get_fb_unmapped_area,
1495 #endif
1496 #ifdef CONFIG_FB_DEFERRED_IO
1497         .fsync =        fb_deferred_io_fsync,
1498 #endif
1499         .llseek =       default_llseek,
1500 };
1501
1502 struct class *fb_class;
1503 EXPORT_SYMBOL(fb_class);
1504
1505 static int fb_check_foreignness(struct fb_info *fi)
1506 {
1507         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1508
1509         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1510
1511 #ifdef __BIG_ENDIAN
1512         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1513 #else
1514         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1515 #endif /* __BIG_ENDIAN */
1516
1517         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1518                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1519                        "support this framebuffer\n", fi->fix.id);
1520                 return -ENOSYS;
1521         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1522                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1523                        "support this framebuffer\n", fi->fix.id);
1524                 return -ENOSYS;
1525         }
1526
1527         return 0;
1528 }
1529
1530 static int do_register_framebuffer(struct fb_info *fb_info)
1531 {
1532         int i;
1533         struct fb_videomode mode;
1534
1535         if (fb_check_foreignness(fb_info))
1536                 return -ENOSYS;
1537
1538         if (num_registered_fb == FB_MAX)
1539                 return -ENXIO;
1540
1541         num_registered_fb++;
1542         for (i = 0 ; i < FB_MAX; i++)
1543                 if (!registered_fb[i])
1544                         break;
1545         fb_info->node = i;
1546         refcount_set(&fb_info->count, 1);
1547         mutex_init(&fb_info->lock);
1548         mutex_init(&fb_info->mm_lock);
1549
1550         fb_info->dev = device_create(fb_class, fb_info->device,
1551                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1552         if (IS_ERR(fb_info->dev)) {
1553                 /* Not fatal */
1554                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1555                 fb_info->dev = NULL;
1556         } else
1557                 fb_init_device(fb_info);
1558
1559         if (fb_info->pixmap.addr == NULL) {
1560                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1561                 if (fb_info->pixmap.addr) {
1562                         fb_info->pixmap.size = FBPIXMAPSIZE;
1563                         fb_info->pixmap.buf_align = 1;
1564                         fb_info->pixmap.scan_align = 1;
1565                         fb_info->pixmap.access_align = 32;
1566                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1567                 }
1568         }
1569         fb_info->pixmap.offset = 0;
1570
1571         if (!fb_info->pixmap.blit_x)
1572                 fb_info->pixmap.blit_x = ~(u32)0;
1573
1574         if (!fb_info->pixmap.blit_y)
1575                 fb_info->pixmap.blit_y = ~(u32)0;
1576
1577         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1578                 INIT_LIST_HEAD(&fb_info->modelist);
1579
1580         if (fb_info->skip_vt_switch)
1581                 pm_vt_switch_required(fb_info->dev, false);
1582         else
1583                 pm_vt_switch_required(fb_info->dev, true);
1584
1585         fb_var_to_videomode(&mode, &fb_info->var);
1586         fb_add_videomode(&mode, &fb_info->modelist);
1587         registered_fb[i] = fb_info;
1588
1589 #ifdef CONFIG_GUMSTIX_AM200EPD
1590         {
1591                 struct fb_event event;
1592                 event.info = fb_info;
1593                 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1594         }
1595 #endif
1596
1597         return fbcon_fb_registered(fb_info);
1598 }
1599
1600 static void unbind_console(struct fb_info *fb_info)
1601 {
1602         int i = fb_info->node;
1603
1604         if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1605                 return;
1606
1607         fbcon_fb_unbind(fb_info);
1608 }
1609
1610 static void unlink_framebuffer(struct fb_info *fb_info)
1611 {
1612         int i;
1613
1614         i = fb_info->node;
1615         if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1616                 return;
1617
1618         if (!fb_info->dev)
1619                 return;
1620
1621         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1622
1623         pm_vt_switch_unregister(fb_info->dev);
1624
1625         unbind_console(fb_info);
1626
1627         fb_info->dev = NULL;
1628 }
1629
1630 static void do_unregister_framebuffer(struct fb_info *fb_info)
1631 {
1632         unlink_framebuffer(fb_info);
1633         if (fb_info->pixmap.addr &&
1634             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) {
1635                 kfree(fb_info->pixmap.addr);
1636                 fb_info->pixmap.addr = NULL;
1637         }
1638
1639         fb_destroy_modelist(&fb_info->modelist);
1640         registered_fb[fb_info->node] = NULL;
1641         num_registered_fb--;
1642         fb_cleanup_device(fb_info);
1643 #ifdef CONFIG_GUMSTIX_AM200EPD
1644         {
1645                 struct fb_event event;
1646                 event.info = fb_info;
1647                 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1648         }
1649 #endif
1650         fbcon_fb_unregistered(fb_info);
1651
1652         /* this may free fb info */
1653         put_fb_info(fb_info);
1654 }
1655
1656 static int fb_aperture_acquire_for_platform_device(struct fb_info *fb_info)
1657 {
1658         struct apertures_struct *ap = fb_info->apertures;
1659         struct device *dev = fb_info->device;
1660         struct platform_device *pdev;
1661         unsigned int i;
1662         int ret;
1663
1664         if (!ap)
1665                 return 0;
1666
1667         if (!dev_is_platform(dev))
1668                 return 0;
1669
1670         pdev = to_platform_device(dev);
1671
1672         for (ret = 0, i = 0; i < ap->count; ++i) {
1673                 ret = devm_aperture_acquire_for_platform_device(pdev, ap->ranges[i].base,
1674                                                                 ap->ranges[i].size);
1675                 if (ret)
1676                         break;
1677         }
1678
1679         return ret;
1680 }
1681
1682 /**
1683  *      register_framebuffer - registers a frame buffer device
1684  *      @fb_info: frame buffer info structure
1685  *
1686  *      Registers a frame buffer device @fb_info.
1687  *
1688  *      Returns negative errno on error, or zero for success.
1689  *
1690  */
1691 int
1692 register_framebuffer(struct fb_info *fb_info)
1693 {
1694         int ret;
1695
1696         if (fb_info->flags & FBINFO_MISC_FIRMWARE) {
1697                 ret = fb_aperture_acquire_for_platform_device(fb_info);
1698                 if (ret)
1699                         return ret;
1700         }
1701
1702         mutex_lock(&registration_lock);
1703         ret = do_register_framebuffer(fb_info);
1704         mutex_unlock(&registration_lock);
1705
1706         return ret;
1707 }
1708 EXPORT_SYMBOL(register_framebuffer);
1709
1710 /**
1711  *      unregister_framebuffer - releases a frame buffer device
1712  *      @fb_info: frame buffer info structure
1713  *
1714  *      Unregisters a frame buffer device @fb_info.
1715  *
1716  *      Returns negative errno on error, or zero for success.
1717  *
1718  *      This function will also notify the framebuffer console
1719  *      to release the driver.
1720  *
1721  *      This is meant to be called within a driver's module_exit()
1722  *      function. If this is called outside module_exit(), ensure
1723  *      that the driver implements fb_open() and fb_release() to
1724  *      check that no processes are using the device.
1725  */
1726 void
1727 unregister_framebuffer(struct fb_info *fb_info)
1728 {
1729         mutex_lock(&registration_lock);
1730         do_unregister_framebuffer(fb_info);
1731         mutex_unlock(&registration_lock);
1732 }
1733 EXPORT_SYMBOL(unregister_framebuffer);
1734
1735 /**
1736  *      fb_set_suspend - low level driver signals suspend
1737  *      @info: framebuffer affected
1738  *      @state: 0 = resuming, !=0 = suspending
1739  *
1740  *      This is meant to be used by low level drivers to
1741  *      signal suspend/resume to the core & clients.
1742  *      It must be called with the console semaphore held
1743  */
1744 void fb_set_suspend(struct fb_info *info, int state)
1745 {
1746         WARN_CONSOLE_UNLOCKED();
1747
1748         if (state) {
1749                 fbcon_suspended(info);
1750                 info->state = FBINFO_STATE_SUSPENDED;
1751         } else {
1752                 info->state = FBINFO_STATE_RUNNING;
1753                 fbcon_resumed(info);
1754         }
1755 }
1756 EXPORT_SYMBOL(fb_set_suspend);
1757
1758 /**
1759  *      fbmem_init - init frame buffer subsystem
1760  *
1761  *      Initialize the frame buffer subsystem.
1762  *
1763  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1764  *
1765  */
1766
1767 static int __init
1768 fbmem_init(void)
1769 {
1770         int ret;
1771
1772         if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops))
1773                 return -ENOMEM;
1774
1775         ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
1776         if (ret) {
1777                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1778                 goto err_chrdev;
1779         }
1780
1781         fb_class = class_create(THIS_MODULE, "graphics");
1782         if (IS_ERR(fb_class)) {
1783                 ret = PTR_ERR(fb_class);
1784                 pr_warn("Unable to create fb class; errno = %d\n", ret);
1785                 fb_class = NULL;
1786                 goto err_class;
1787         }
1788
1789         fb_console_init();
1790
1791         return 0;
1792
1793 err_class:
1794         unregister_chrdev(FB_MAJOR, "fb");
1795 err_chrdev:
1796         remove_proc_entry("fb", NULL);
1797         return ret;
1798 }
1799
1800 #ifdef MODULE
1801 module_init(fbmem_init);
1802 static void __exit
1803 fbmem_exit(void)
1804 {
1805         fb_console_exit();
1806
1807         remove_proc_entry("fb", NULL);
1808         class_destroy(fb_class);
1809         unregister_chrdev(FB_MAJOR, "fb");
1810 }
1811
1812 module_exit(fbmem_exit);
1813 MODULE_LICENSE("GPL");
1814 MODULE_DESCRIPTION("Framebuffer base");
1815 #else
1816 subsys_initcall(fbmem_init);
1817 #endif
1818
1819 int fb_new_modelist(struct fb_info *info)
1820 {
1821         struct fb_var_screeninfo var = info->var;
1822         struct list_head *pos, *n;
1823         struct fb_modelist *modelist;
1824         struct fb_videomode *m, mode;
1825         int err;
1826
1827         list_for_each_safe(pos, n, &info->modelist) {
1828                 modelist = list_entry(pos, struct fb_modelist, list);
1829                 m = &modelist->mode;
1830                 fb_videomode_to_var(&var, m);
1831                 var.activate = FB_ACTIVATE_TEST;
1832                 err = fb_set_var(info, &var);
1833                 fb_var_to_videomode(&mode, &var);
1834                 if (err || !fb_mode_is_equal(m, &mode)) {
1835                         list_del(pos);
1836                         kfree(pos);
1837                 }
1838         }
1839
1840         if (list_empty(&info->modelist))
1841                 return 1;
1842
1843         fbcon_new_modelist(info);
1844
1845         return 0;
1846 }
1847
1848 #if defined(CONFIG_VIDEO_NOMODESET)
1849 bool fb_modesetting_disabled(const char *drvname)
1850 {
1851         bool fwonly = video_firmware_drivers_only();
1852
1853         if (fwonly)
1854                 pr_warn("Driver %s not loading because of nomodeset parameter\n",
1855                         drvname);
1856
1857         return fwonly;
1858 }
1859 EXPORT_SYMBOL(fb_modesetting_disabled);
1860 #endif
1861
1862 MODULE_LICENSE("GPL");