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/compat.h>
  17 #include <linux/types.h>
  18 #include <linux/errno.h>
  19 #include <linux/kernel.h>
  20 #include <linux/major.h>
  21 #include <linux/slab.h>
  22 #include <linux/mm.h>
  23 #include <linux/mman.h>
  24 #include <linux/vt.h>
  25 #include <linux/init.h>
  26 #include <linux/linux_logo.h>
  27 #include <linux/proc_fs.h>
  28 #include <linux/seq_file.h>
  29 #include <linux/console.h>
  30 #include <linux/kmod.h>
  31 #include <linux/err.h>
  32 #include <linux/device.h>
  33 #include <linux/efi.h>
  34 #include <linux/fb.h>
  35 #include <linux/fbcon.h>
  36 #include <linux/mem_encrypt.h>
  37 #include <linux/pci.h>
  38
  39 #include <asm/fb.h>
  40
  41
  42     /*
  43      *  Frame buffer device initialization and setup routines
  44      */
  45
  46 #define FBPIXMAPSIZE    (1024 * 8)
  47
  48 static DEFINE_MUTEX(registration_lock);
  49
  50 struct fb_info *registered_fb[FB_MAX] __read_mostly;
  51 EXPORT_SYMBOL(registered_fb);
  52
  53 int num_registered_fb __read_mostly;
  54 EXPORT_SYMBOL(num_registered_fb);
  55
  56 bool fb_center_logo __read_mostly;
  57
  58 int fb_logo_count __read_mostly = -1;
  59
  60 static struct fb_info *get_fb_info(unsigned int idx)
  61 {
  62         struct fb_info *fb_info;
  63
  64         if (idx >= FB_MAX)
  65                 return ERR_PTR(-ENODEV);
  66
  67         mutex_lock(&registration_lock);
  68         fb_info = registered_fb[idx];
  69         if (fb_info)
  70                 atomic_inc(&fb_info->count);
  71         mutex_unlock(&registration_lock);
  72
  73         return fb_info;
  74 }
  75
  76 static void put_fb_info(struct fb_info *fb_info)
  77 {
  78         if (!atomic_dec_and_test(&fb_info->count))
  79                 return;
  80         if (fb_info->fbops->fb_destroy)
  81                 fb_info->fbops->fb_destroy(fb_info);
  82 }
  83
  84 /*
  85  * Helpers
  86  */
  87
  88 int fb_get_color_depth(struct fb_var_screeninfo *var,
  89                        struct fb_fix_screeninfo *fix)
  90 {
  91         int depth = 0;
  92
  93         if (fix->visual == FB_VISUAL_MONO01 ||
  94             fix->visual == FB_VISUAL_MONO10)
  95                 depth = 1;
  96         else {
  97                 if (var->green.length == var->blue.length &&
  98                     var->green.length == var->red.length &&
  99                     var->green.offset == var->blue.offset &&
 100                     var->green.offset == var->red.offset)
 101                         depth = var->green.length;
 102                 else
 103                         depth = var->green.length + var->red.length +
 104                                 var->blue.length;
 105         }
 106
 107         return depth;
 108 }
 109 EXPORT_SYMBOL(fb_get_color_depth);
 110
 111 /*
 112  * Data padding functions.
 113  */
 114 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
 115 {
 116         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
 117 }
 118 EXPORT_SYMBOL(fb_pad_aligned_buffer);
 119
 120 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
 121                                 u32 shift_high, u32 shift_low, u32 mod)
 122 {
 123         u8 mask = (u8) (0xfff << shift_high), tmp;
 124         int i, j;
 125
 126         for (i = height; i--; ) {
 127                 for (j = 0; j < idx; j++) {
 128                         tmp = dst[j];
 129                         tmp &= mask;
 130                         tmp |= *src >> shift_low;
 131                         dst[j] = tmp;
 132                         tmp = *src << shift_high;
 133                         dst[j+1] = tmp;
 134                         src++;
 135                 }
 136                 tmp = dst[idx];
 137                 tmp &= mask;
 138                 tmp |= *src >> shift_low;
 139                 dst[idx] = tmp;
 140                 if (shift_high < mod) {
 141                         tmp = *src << shift_high;
 142                         dst[idx+1] = tmp;
 143                 }
 144                 src++;
 145                 dst += d_pitch;
 146         }
 147 }
 148 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 149
 150 /*
 151  * we need to lock this section since fb_cursor
 152  * may use fb_imageblit()
 153  */
 154 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 155 {
 156         u32 align = buf->buf_align - 1, offset;
 157         char *addr = buf->addr;
 158
 159         /* If IO mapped, we need to sync before access, no sharing of
 160          * the pixmap is done
 161          */
 162         if (buf->flags & FB_PIXMAP_IO) {
 163                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 164                         info->fbops->fb_sync(info);
 165                 return addr;
 166         }
 167
 168         /* See if we fit in the remaining pixmap space */
 169         offset = buf->offset + align;
 170         offset &= ~align;
 171         if (offset + size > buf->size) {
 172                 /* We do not fit. In order to be able to re-use the buffer,
 173                  * we must ensure no asynchronous DMA'ing or whatever operation
 174                  * is in progress, we sync for that.
 175                  */
 176                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 177                         info->fbops->fb_sync(info);
 178                 offset = 0;
 179         }
 180         buf->offset = offset + size;
 181         addr += offset;
 182
 183         return addr;
 184 }
 185 EXPORT_SYMBOL(fb_get_buffer_offset);
 186
 187 #ifdef CONFIG_LOGO
 188
 189 static inline unsigned safe_shift(unsigned d, int n)
 190 {
 191         return n < 0 ? d >> -n : d << n;
 192 }
 193
 194 static void fb_set_logocmap(struct fb_info *info,
 195                                    const struct linux_logo *logo)
 196 {
 197         struct fb_cmap palette_cmap;
 198         u16 palette_green[16];
 199         u16 palette_blue[16];
 200         u16 palette_red[16];
 201         int i, j, n;
 202         const unsigned char *clut = logo->clut;
 203
 204         palette_cmap.start = 0;
 205         palette_cmap.len = 16;
 206         palette_cmap.red = palette_red;
 207         palette_cmap.green = palette_green;
 208         palette_cmap.blue = palette_blue;
 209         palette_cmap.transp = NULL;
 210
 211         for (i = 0; i < logo->clutsize; i += n) {
 212                 n = logo->clutsize - i;
 213                 /* palette_cmap provides space for only 16 colors at once */
 214                 if (n > 16)
 215                         n = 16;
 216                 palette_cmap.start = 32 + i;
 217                 palette_cmap.len = n;
 218                 for (j = 0; j < n; ++j) {
 219                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 220                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 221                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 222                         clut += 3;
 223                 }
 224                 fb_set_cmap(&palette_cmap, info);
 225         }
 226 }
 227
 228 static void  fb_set_logo_truepalette(struct fb_info *info,
 229                                             const struct linux_logo *logo,
 230                                             u32 *palette)
 231 {
 232         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 233         unsigned char redmask, greenmask, bluemask;
 234         int redshift, greenshift, blueshift;
 235         int i;
 236         const unsigned char *clut = logo->clut;
 237
 238         /*
 239          * We have to create a temporary palette since console palette is only
 240          * 16 colors long.
 241          */
 242         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 243         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 244         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 245         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 246         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 247         greenshift = info->var.green.offset - (8 - info->var.green.length);
 248         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 249
 250         for ( i = 0; i < logo->clutsize; i++) {
 251                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 252                                  safe_shift((clut[1] & greenmask), greenshift) |
 253                                  safe_shift((clut[2] & bluemask), blueshift));
 254                 clut += 3;
 255         }
 256 }
 257
 258 static void fb_set_logo_directpalette(struct fb_info *info,
 259                                              const struct linux_logo *logo,
 260                                              u32 *palette)
 261 {
 262         int redshift, greenshift, blueshift;
 263         int i;
 264
 265         redshift = info->var.red.offset;
 266         greenshift = info->var.green.offset;
 267         blueshift = info->var.blue.offset;
 268
 269         for (i = 32; i < 32 + logo->clutsize; i++)
 270                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 271 }
 272
 273 static void fb_set_logo(struct fb_info *info,
 274                                const struct linux_logo *logo, u8 *dst,
 275                                int depth)
 276 {
 277         int i, j, k;
 278         const u8 *src = logo->data;
 279         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 280         u8 fg = 1, d;
 281
 282         switch (fb_get_color_depth(&info->var, &info->fix)) {
 283         case 1:
 284                 fg = 1;
 285                 break;
 286         case 2:
 287                 fg = 3;
 288                 break;
 289         default:
 290                 fg = 7;
 291                 break;
 292         }
 293
 294         if (info->fix.visual == FB_VISUAL_MONO01 ||
 295             info->fix.visual == FB_VISUAL_MONO10)
 296                 fg = ~((u8) (0xfff << info->var.green.length));
 297
 298         switch (depth) {
 299         case 4:
 300                 for (i = 0; i < logo->height; i++)
 301                         for (j = 0; j < logo->width; src++) {
 302                                 *dst++ = *src >> 4;
 303                                 j++;
 304                                 if (j < logo->width) {
 305                                         *dst++ = *src & 0x0f;
 306                                         j++;
 307                                 }
 308                         }
 309                 break;
 310         case 1:
 311                 for (i = 0; i < logo->height; i++) {
 312                         for (j = 0; j < logo->width; src++) {
 313                                 d = *src ^ xor;
 314                                 for (k = 7; k >= 0 && j < logo->width; k--) {
 315                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 316                                         j++;
 317                                 }
 318                         }
 319                 }
 320                 break;
 321         }
 322 }
 323
 324 /*
 325  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 326  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 327  * the visual format and color depth of the framebuffer, the DAC, the
 328  * pseudo_palette, and the logo data will be adjusted accordingly.
 329  *
 330  * Case 1 - linux_logo_clut224:
 331  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 332  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 333  *
 334  * For visuals that require color info from the pseudo_palette, we also construct
 335  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 336  * will be set.
 337  *
 338  * Case 2 - linux_logo_vga16:
 339  * The number of colors just matches the console colors, thus there is no need
 340  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 341  * each byte contains color information for two pixels (upper and lower nibble).
 342  * To be consistent with fb_imageblit() usage, we therefore separate the two
 343  * nibbles into separate bytes. The "depth" flag will be set to 4.
 344  *
 345  * Case 3 - linux_logo_mono:
 346  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 347  * We isolate each bit and expand each into a byte. The "depth" flag will
 348  * be set to 1.
 349  */
 350 static struct logo_data {
 351         int depth;
 352         int needs_directpalette;
 353         int needs_truepalette;
 354         int needs_cmapreset;
 355         const struct linux_logo *logo;
 356 } fb_logo __read_mostly;
 357
 358 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 359 {
 360         u32 size = width * height, i;
 361
 362         out += size - 1;
 363
 364         for (i = size; i--; )
 365                 *out-- = *in++;
 366 }
 367
 368 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 369 {
 370         int i, j, h = height - 1;
 371
 372         for (i = 0; i < height; i++)
 373                 for (j = 0; j < width; j++)
 374                                 out[height * j + h - i] = *in++;
 375 }
 376
 377 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 378 {
 379         int i, j, w = width - 1;
 380
 381         for (i = 0; i < height; i++)
 382                 for (j = 0; j < width; j++)
 383                         out[height * (w - j) + i] = *in++;
 384 }
 385
 386 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 387                            struct fb_image *image, int rotate)
 388 {
 389         u32 tmp;
 390
 391         if (rotate == FB_ROTATE_UD) {
 392                 fb_rotate_logo_ud(image->data, dst, image->width,
 393                                   image->height);
 394                 image->dx = info->var.xres - image->width - image->dx;
 395                 image->dy = info->var.yres - image->height - image->dy;
 396         } else if (rotate == FB_ROTATE_CW) {
 397                 fb_rotate_logo_cw(image->data, dst, image->width,
 398                                   image->height);
 399                 tmp = image->width;
 400                 image->width = image->height;
 401                 image->height = tmp;
 402                 tmp = image->dy;
 403                 image->dy = image->dx;
 404                 image->dx = info->var.xres - image->width - tmp;
 405         } else if (rotate == FB_ROTATE_CCW) {
 406                 fb_rotate_logo_ccw(image->data, dst, image->width,
 407                                    image->height);
 408                 tmp = image->width;
 409                 image->width = image->height;
 410                 image->height = tmp;
 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 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
 966         if (var->activate & FB_ACTIVATE_INV_MODE) {
 967                 struct fb_videomode mode1, mode2;
 968
 969                 fb_var_to_videomode(&mode1, var);
 970                 fb_var_to_videomode(&mode2, &info->var);
 971                 /* make sure we don't delete the videomode of current var */
 972                 ret = fb_mode_is_equal(&mode1, &mode2);
 973
 974                 if (!ret)
 975                         fbcon_mode_deleted(info, &mode1);
 976
 977                 if (!ret)
 978                         fb_delete_videomode(&mode1, &info->modelist);
 979
 980
 981                 return ret ? -EINVAL : 0;
 982         }
 983
 984         if (!(var->activate & FB_ACTIVATE_FORCE) &&
 985             !memcmp(&info->var, var, sizeof(struct fb_var_screeninfo)))
 986                 return 0;
 987
 988         activate = var->activate;
 989
 990         /* When using FOURCC mode, make sure the red, green, blue and
 991          * transp fields are set to 0.
 992          */
 993         if ((info->fix.capabilities & FB_CAP_FOURCC) &&
 994             var->grayscale > 1) {
 995                 if (var->red.offset     || var->green.offset    ||
 996                     var->blue.offset    || var->transp.offset   ||
 997                     var->red.length     || var->green.length    ||
 998                     var->blue.length    || var->transp.length   ||
 999                     var->red.msb_right  || var->green.msb_right ||
1000                     var->blue.msb_right || var->transp.msb_right)
1001                         return -EINVAL;
1002         }
1003
1004         if (!info->fbops->fb_check_var) {
1005                 *var = info->var;
1006                 return 0;
1007         }
1008
1009         ret = info->fbops->fb_check_var(var, info);
1010
1011         if (ret)
1012                 return ret;
1013
1014         if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW)
1015                 return 0;
1016
1017         if (info->fbops->fb_get_caps) {
1018                 ret = fb_check_caps(info, var, activate);
1019
1020                 if (ret)
1021                         return ret;
1022         }
1023
1024         old_var = info->var;
1025         info->var = *var;
1026
1027         if (info->fbops->fb_set_par) {
1028                 ret = info->fbops->fb_set_par(info);
1029
1030                 if (ret) {
1031                         info->var = old_var;
1032                         printk(KERN_WARNING "detected "
1033                                 "fb_set_par error, "
1034                                 "error code: %d\n", ret);
1035                         return ret;
1036                 }
1037         }
1038
1039         fb_pan_display(info, &info->var);
1040         fb_set_cmap(&info->cmap, info);
1041         fb_var_to_videomode(&mode, &info->var);
1042
1043         if (info->modelist.prev && info->modelist.next &&
1044             !list_empty(&info->modelist))
1045                 ret = fb_add_videomode(&mode, &info->modelist);
1046
1047         if (ret)
1048                 return ret;
1049
1050         event.info = info;
1051         event.data = &mode;
1052         fb_notifier_call_chain(FB_EVENT_MODE_CHANGE, &event);
1053
1054         return 0;
1055 }
1056 EXPORT_SYMBOL(fb_set_var);
1057
1058 int
1059 fb_blank(struct fb_info *info, int blank)
1060 {
1061         struct fb_event event;
1062         int ret = -EINVAL;
1063
1064         if (blank > FB_BLANK_POWERDOWN)
1065                 blank = FB_BLANK_POWERDOWN;
1066
1067         event.info = info;
1068         event.data = &blank;
1069
1070         if (info->fbops->fb_blank)
1071                 ret = info->fbops->fb_blank(blank, info);
1072
1073         if (!ret)
1074                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1075
1076         return ret;
1077 }
1078 EXPORT_SYMBOL(fb_blank);
1079
1080 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1081                         unsigned long arg)
1082 {
1083         const struct fb_ops *fb;
1084         struct fb_var_screeninfo var;
1085         struct fb_fix_screeninfo fix;
1086         struct fb_cmap cmap_from;
1087         struct fb_cmap_user cmap;
1088         void __user *argp = (void __user *)arg;
1089         long ret = 0;
1090
1091         switch (cmd) {
1092         case FBIOGET_VSCREENINFO:
1093                 lock_fb_info(info);
1094                 var = info->var;
1095                 unlock_fb_info(info);
1096
1097                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1098                 break;
1099         case FBIOPUT_VSCREENINFO:
1100                 if (copy_from_user(&var, argp, sizeof(var)))
1101                         return -EFAULT;
1102                 console_lock();
1103                 lock_fb_info(info);
1104                 ret = fb_set_var(info, &var);
1105                 if (!ret)
1106                         fbcon_update_vcs(info, var.activate & FB_ACTIVATE_ALL);
1107                 unlock_fb_info(info);
1108                 console_unlock();
1109                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1110                         ret = -EFAULT;
1111                 break;
1112         case FBIOGET_FSCREENINFO:
1113                 lock_fb_info(info);
1114                 memcpy(&fix, &info->fix, sizeof(fix));
1115                 if (info->flags & FBINFO_HIDE_SMEM_START)
1116                         fix.smem_start = 0;
1117                 unlock_fb_info(info);
1118
1119                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1120                 break;
1121         case FBIOPUTCMAP:
1122                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1123                         return -EFAULT;
1124                 ret = fb_set_user_cmap(&cmap, info);
1125                 break;
1126         case FBIOGETCMAP:
1127                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1128                         return -EFAULT;
1129                 lock_fb_info(info);
1130                 cmap_from = info->cmap;
1131                 unlock_fb_info(info);
1132                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1133                 break;
1134         case FBIOPAN_DISPLAY:
1135                 if (copy_from_user(&var, argp, sizeof(var)))
1136                         return -EFAULT;
1137                 console_lock();
1138                 lock_fb_info(info);
1139                 ret = fb_pan_display(info, &var);
1140                 unlock_fb_info(info);
1141                 console_unlock();
1142                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1143                         return -EFAULT;
1144                 break;
1145         case FBIO_CURSOR:
1146                 ret = -EINVAL;
1147                 break;
1148         case FBIOGET_CON2FBMAP:
1149                 ret = fbcon_get_con2fb_map_ioctl(argp);
1150                 break;
1151         case FBIOPUT_CON2FBMAP:
1152                 ret = fbcon_set_con2fb_map_ioctl(argp);
1153                 break;
1154         case FBIOBLANK:
1155                 console_lock();
1156                 lock_fb_info(info);
1157                 ret = fb_blank(info, arg);
1158                 /* might again call into fb_blank */
1159                 fbcon_fb_blanked(info, arg);
1160                 unlock_fb_info(info);
1161                 console_unlock();
1162                 break;
1163         default:
1164                 lock_fb_info(info);
1165                 fb = info->fbops;
1166                 if (fb->fb_ioctl)
1167                         ret = fb->fb_ioctl(info, cmd, arg);
1168                 else
1169                         ret = -ENOTTY;
1170                 unlock_fb_info(info);
1171         }
1172         return ret;
1173 }
1174
1175 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1176 {
1177         struct fb_info *info = file_fb_info(file);
1178
1179         if (!info)
1180                 return -ENODEV;
1181         return do_fb_ioctl(info, cmd, arg);
1182 }
1183
1184 #ifdef CONFIG_COMPAT
1185 struct fb_fix_screeninfo32 {
1186         char                    id[16];
1187         compat_caddr_t          smem_start;
1188         u32                     smem_len;
1189         u32                     type;
1190         u32                     type_aux;
1191         u32                     visual;
1192         u16                     xpanstep;
1193         u16                     ypanstep;
1194         u16                     ywrapstep;
1195         u32                     line_length;
1196         compat_caddr_t          mmio_start;
1197         u32                     mmio_len;
1198         u32                     accel;
1199         u16                     reserved[3];
1200 };
1201
1202 struct fb_cmap32 {
1203         u32                     start;
1204         u32                     len;
1205         compat_caddr_t  red;
1206         compat_caddr_t  green;
1207         compat_caddr_t  blue;
1208         compat_caddr_t  transp;
1209 };
1210
1211 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1212                           unsigned long arg)
1213 {
1214         struct fb_cmap_user __user *cmap;
1215         struct fb_cmap32 __user *cmap32;
1216         __u32 data;
1217         int err;
1218
1219         cmap = compat_alloc_user_space(sizeof(*cmap));
1220         cmap32 = compat_ptr(arg);
1221
1222         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1223                 return -EFAULT;
1224
1225         if (get_user(data, &cmap32->red) ||
1226             put_user(compat_ptr(data), &cmap->red) ||
1227             get_user(data, &cmap32->green) ||
1228             put_user(compat_ptr(data), &cmap->green) ||
1229             get_user(data, &cmap32->blue) ||
1230             put_user(compat_ptr(data), &cmap->blue) ||
1231             get_user(data, &cmap32->transp) ||
1232             put_user(compat_ptr(data), &cmap->transp))
1233                 return -EFAULT;
1234
1235         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1236
1237         if (!err) {
1238                 if (copy_in_user(&cmap32->start,
1239                                  &cmap->start,
1240                                  2 * sizeof(__u32)))
1241                         err = -EFAULT;
1242         }
1243         return err;
1244 }
1245
1246 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1247                                   struct fb_fix_screeninfo32 __user *fix32)
1248 {
1249         __u32 data;
1250         int err;
1251
1252         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1253
1254         data = (__u32) (unsigned long) fix->smem_start;
1255         err |= put_user(data, &fix32->smem_start);
1256
1257         err |= put_user(fix->smem_len, &fix32->smem_len);
1258         err |= put_user(fix->type, &fix32->type);
1259         err |= put_user(fix->type_aux, &fix32->type_aux);
1260         err |= put_user(fix->visual, &fix32->visual);
1261         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1262         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1263         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1264         err |= put_user(fix->line_length, &fix32->line_length);
1265
1266         data = (__u32) (unsigned long) fix->mmio_start;
1267         err |= put_user(data, &fix32->mmio_start);
1268
1269         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1270         err |= put_user(fix->accel, &fix32->accel);
1271         err |= copy_to_user(fix32->reserved, fix->reserved,
1272                             sizeof(fix->reserved));
1273
1274         if (err)
1275                 return -EFAULT;
1276         return 0;
1277 }
1278
1279 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1280                               unsigned long arg)
1281 {
1282         struct fb_fix_screeninfo fix;
1283
1284         lock_fb_info(info);
1285         fix = info->fix;
1286         if (info->flags & FBINFO_HIDE_SMEM_START)
1287                 fix.smem_start = 0;
1288         unlock_fb_info(info);
1289         return do_fscreeninfo_to_user(&fix, compat_ptr(arg));
1290 }
1291
1292 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1293                             unsigned long arg)
1294 {
1295         struct fb_info *info = file_fb_info(file);
1296         const struct fb_ops *fb;
1297         long ret = -ENOIOCTLCMD;
1298
1299         if (!info)
1300                 return -ENODEV;
1301         fb = info->fbops;
1302         switch(cmd) {
1303         case FBIOGET_VSCREENINFO:
1304         case FBIOPUT_VSCREENINFO:
1305         case FBIOPAN_DISPLAY:
1306         case FBIOGET_CON2FBMAP:
1307         case FBIOPUT_CON2FBMAP:
1308                 arg = (unsigned long) compat_ptr(arg);
1309                 fallthrough;
1310         case FBIOBLANK:
1311                 ret = do_fb_ioctl(info, cmd, arg);
1312                 break;
1313
1314         case FBIOGET_FSCREENINFO:
1315                 ret = fb_get_fscreeninfo(info, cmd, arg);
1316                 break;
1317
1318         case FBIOGETCMAP:
1319         case FBIOPUTCMAP:
1320                 ret = fb_getput_cmap(info, cmd, arg);
1321                 break;
1322
1323         default:
1324                 if (fb->fb_compat_ioctl)
1325                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1326                 break;
1327         }
1328         return ret;
1329 }
1330 #endif
1331
1332 static int
1333 fb_mmap(struct file *file, struct vm_area_struct * vma)
1334 {
1335         struct fb_info *info = file_fb_info(file);
1336         int (*fb_mmap_fn)(struct fb_info *info, struct vm_area_struct *vma);
1337         unsigned long mmio_pgoff;
1338         unsigned long start;
1339         u32 len;
1340
1341         if (!info)
1342                 return -ENODEV;
1343         mutex_lock(&info->mm_lock);
1344
1345         fb_mmap_fn = info->fbops->fb_mmap;
1346
1347 #if IS_ENABLED(CONFIG_FB_DEFERRED_IO)
1348         if (info->fbdefio)
1349                 fb_mmap_fn = fb_deferred_io_mmap;
1350 #endif
1351
1352         if (fb_mmap_fn) {
1353                 int res;
1354
1355                 /*
1356                  * The framebuffer needs to be accessed decrypted, be sure
1357                  * SME protection is removed ahead of the call
1358                  */
1359                 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1360                 res = fb_mmap_fn(info, vma);
1361                 mutex_unlock(&info->mm_lock);
1362                 return res;
1363         }
1364
1365         /*
1366          * Ugh. This can be either the frame buffer mapping, or
1367          * if pgoff points past it, the mmio mapping.
1368          */
1369         start = info->fix.smem_start;
1370         len = info->fix.smem_len;
1371         mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1372         if (vma->vm_pgoff >= mmio_pgoff) {
1373                 if (info->var.accel_flags) {
1374                         mutex_unlock(&info->mm_lock);
1375                         return -EINVAL;
1376                 }
1377
1378                 vma->vm_pgoff -= mmio_pgoff;
1379                 start = info->fix.mmio_start;
1380                 len = info->fix.mmio_len;
1381         }
1382         mutex_unlock(&info->mm_lock);
1383
1384         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1385         /*
1386          * The framebuffer needs to be accessed decrypted, be sure
1387          * SME protection is removed
1388          */
1389         vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1390         fb_pgprotect(file, vma, start);
1391
1392         return vm_iomap_memory(vma, start, len);
1393 }
1394
1395 static int
1396 fb_open(struct inode *inode, struct file *file)
1397 __acquires(&info->lock)
1398 __releases(&info->lock)
1399 {
1400         int fbidx = iminor(inode);
1401         struct fb_info *info;
1402         int res = 0;
1403
1404         info = get_fb_info(fbidx);
1405         if (!info) {
1406                 request_module("fb%d", fbidx);
1407                 info = get_fb_info(fbidx);
1408                 if (!info)
1409                         return -ENODEV;
1410         }
1411         if (IS_ERR(info))
1412                 return PTR_ERR(info);
1413
1414         lock_fb_info(info);
1415         if (!try_module_get(info->fbops->owner)) {
1416                 res = -ENODEV;
1417                 goto out;
1418         }
1419         file->private_data = info;
1420         if (info->fbops->fb_open) {
1421                 res = info->fbops->fb_open(info,1);
1422                 if (res)
1423                         module_put(info->fbops->owner);
1424         }
1425 #ifdef CONFIG_FB_DEFERRED_IO
1426         if (info->fbdefio)
1427                 fb_deferred_io_open(info, inode, file);
1428 #endif
1429 out:
1430         unlock_fb_info(info);
1431         if (res)
1432                 put_fb_info(info);
1433         return res;
1434 }
1435
1436 static int
1437 fb_release(struct inode *inode, struct file *file)
1438 __acquires(&info->lock)
1439 __releases(&info->lock)
1440 {
1441         struct fb_info * const info = file->private_data;
1442
1443         lock_fb_info(info);
1444         if (info->fbops->fb_release)
1445                 info->fbops->fb_release(info,1);
1446         module_put(info->fbops->owner);
1447         unlock_fb_info(info);
1448         put_fb_info(info);
1449         return 0;
1450 }
1451
1452 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU)
1453 unsigned long get_fb_unmapped_area(struct file *filp,
1454                                    unsigned long addr, unsigned long len,
1455                                    unsigned long pgoff, unsigned long flags)
1456 {
1457         struct fb_info * const info = filp->private_data;
1458         unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
1459
1460         if (pgoff > fb_size || len > fb_size - pgoff)
1461                 return -EINVAL;
1462
1463         return (unsigned long)info->screen_base + pgoff;
1464 }
1465 #endif
1466
1467 static const struct file_operations fb_fops = {
1468         .owner =        THIS_MODULE,
1469         .read =         fb_read,
1470         .write =        fb_write,
1471         .unlocked_ioctl = fb_ioctl,
1472 #ifdef CONFIG_COMPAT
1473         .compat_ioctl = fb_compat_ioctl,
1474 #endif
1475         .mmap =         fb_mmap,
1476         .open =         fb_open,
1477         .release =      fb_release,
1478 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \
1479         (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \
1480          !defined(CONFIG_MMU))
1481         .get_unmapped_area = get_fb_unmapped_area,
1482 #endif
1483 #ifdef CONFIG_FB_DEFERRED_IO
1484         .fsync =        fb_deferred_io_fsync,
1485 #endif
1486         .llseek =       default_llseek,
1487 };
1488
1489 struct class *fb_class;
1490 EXPORT_SYMBOL(fb_class);
1491
1492 static int fb_check_foreignness(struct fb_info *fi)
1493 {
1494         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1495
1496         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1497
1498 #ifdef __BIG_ENDIAN
1499         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1500 #else
1501         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1502 #endif /* __BIG_ENDIAN */
1503
1504         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1505                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1506                        "support this framebuffer\n", fi->fix.id);
1507                 return -ENOSYS;
1508         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1509                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1510                        "support this framebuffer\n", fi->fix.id);
1511                 return -ENOSYS;
1512         }
1513
1514         return 0;
1515 }
1516
1517 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1518 {
1519         /* is the generic aperture base the same as the HW one */
1520         if (gen->base == hw->base)
1521                 return true;
1522         /* is the generic aperture base inside the hw base->hw base+size */
1523         if (gen->base > hw->base && gen->base < hw->base + hw->size)
1524                 return true;
1525         return false;
1526 }
1527
1528 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1529                                     struct apertures_struct *hwa)
1530 {
1531         int i, j;
1532         if (!hwa || !gena)
1533                 return false;
1534
1535         for (i = 0; i < hwa->count; ++i) {
1536                 struct aperture *h = &hwa->ranges[i];
1537                 for (j = 0; j < gena->count; ++j) {
1538                         struct aperture *g = &gena->ranges[j];
1539                         printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1540                                 (unsigned long long)g->base,
1541                                 (unsigned long long)g->size,
1542                                 (unsigned long long)h->base,
1543                                 (unsigned long long)h->size);
1544                         if (apertures_overlap(g, h))
1545                                 return true;
1546                 }
1547         }
1548
1549         return false;
1550 }
1551
1552 static void do_unregister_framebuffer(struct fb_info *fb_info);
1553
1554 #define VGA_FB_PHYS 0xA0000
1555 static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
1556                                                const char *name, bool primary)
1557 {
1558         int i;
1559
1560         /* check all firmware fbs and kick off if the base addr overlaps */
1561         for_each_registered_fb(i) {
1562                 struct apertures_struct *gen_aper;
1563
1564                 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1565                         continue;
1566
1567                 gen_aper = registered_fb[i]->apertures;
1568                 if (fb_do_apertures_overlap(gen_aper, a) ||
1569                         (primary && gen_aper && gen_aper->count &&
1570                          gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1571
1572                         printk(KERN_INFO "fb%d: switching to %s from %s\n",
1573                                i, name, registered_fb[i]->fix.id);
1574                         do_unregister_framebuffer(registered_fb[i]);
1575                 }
1576         }
1577 }
1578
1579 static bool lockless_register_fb;
1580 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
1581 MODULE_PARM_DESC(lockless_register_fb,
1582         "Lockless framebuffer registration for debugging [default=off]");
1583
1584 static int do_register_framebuffer(struct fb_info *fb_info)
1585 {
1586         int i, ret;
1587         struct fb_videomode mode;
1588
1589         if (fb_check_foreignness(fb_info))
1590                 return -ENOSYS;
1591
1592         do_remove_conflicting_framebuffers(fb_info->apertures,
1593                                            fb_info->fix.id,
1594                                            fb_is_primary_device(fb_info));
1595
1596         if (num_registered_fb == FB_MAX)
1597                 return -ENXIO;
1598
1599         num_registered_fb++;
1600         for (i = 0 ; i < FB_MAX; i++)
1601                 if (!registered_fb[i])
1602                         break;
1603         fb_info->node = i;
1604         atomic_set(&fb_info->count, 1);
1605         mutex_init(&fb_info->lock);
1606         mutex_init(&fb_info->mm_lock);
1607
1608         fb_info->dev = device_create(fb_class, fb_info->device,
1609                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1610         if (IS_ERR(fb_info->dev)) {
1611                 /* Not fatal */
1612                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1613                 fb_info->dev = NULL;
1614         } else
1615                 fb_init_device(fb_info);
1616
1617         if (fb_info->pixmap.addr == NULL) {
1618                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1619                 if (fb_info->pixmap.addr) {
1620                         fb_info->pixmap.size = FBPIXMAPSIZE;
1621                         fb_info->pixmap.buf_align = 1;
1622                         fb_info->pixmap.scan_align = 1;
1623                         fb_info->pixmap.access_align = 32;
1624                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1625                 }
1626         }
1627         fb_info->pixmap.offset = 0;
1628
1629         if (!fb_info->pixmap.blit_x)
1630                 fb_info->pixmap.blit_x = ~(u32)0;
1631
1632         if (!fb_info->pixmap.blit_y)
1633                 fb_info->pixmap.blit_y = ~(u32)0;
1634
1635         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1636                 INIT_LIST_HEAD(&fb_info->modelist);
1637
1638         if (fb_info->skip_vt_switch)
1639                 pm_vt_switch_required(fb_info->dev, false);
1640         else
1641                 pm_vt_switch_required(fb_info->dev, true);
1642
1643         fb_var_to_videomode(&mode, &fb_info->var);
1644         fb_add_videomode(&mode, &fb_info->modelist);
1645         registered_fb[i] = fb_info;
1646
1647 #ifdef CONFIG_GUMSTIX_AM200EPD
1648         {
1649                 struct fb_event event;
1650                 event.info = fb_info;
1651                 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1652         }
1653 #endif
1654
1655         if (!lockless_register_fb)
1656                 console_lock();
1657         else
1658                 atomic_inc(&ignore_console_lock_warning);
1659         lock_fb_info(fb_info);
1660         ret = fbcon_fb_registered(fb_info);
1661         unlock_fb_info(fb_info);
1662
1663         if (!lockless_register_fb)
1664                 console_unlock();
1665         else
1666                 atomic_dec(&ignore_console_lock_warning);
1667         return ret;
1668 }
1669
1670 static void unbind_console(struct fb_info *fb_info)
1671 {
1672         int i = fb_info->node;
1673
1674         if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1675                 return;
1676
1677         console_lock();
1678         lock_fb_info(fb_info);
1679         fbcon_fb_unbind(fb_info);
1680         unlock_fb_info(fb_info);
1681         console_unlock();
1682 }
1683
1684 static void unlink_framebuffer(struct fb_info *fb_info)
1685 {
1686         int i;
1687
1688         i = fb_info->node;
1689         if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1690                 return;
1691
1692         if (!fb_info->dev)
1693                 return;
1694
1695         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1696
1697         pm_vt_switch_unregister(fb_info->dev);
1698
1699         unbind_console(fb_info);
1700
1701         fb_info->dev = NULL;
1702 }
1703
1704 static void do_unregister_framebuffer(struct fb_info *fb_info)
1705 {
1706         unlink_framebuffer(fb_info);
1707         if (fb_info->pixmap.addr &&
1708             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1709                 kfree(fb_info->pixmap.addr);
1710         fb_destroy_modelist(&fb_info->modelist);
1711         registered_fb[fb_info->node] = NULL;
1712         num_registered_fb--;
1713         fb_cleanup_device(fb_info);
1714 #ifdef CONFIG_GUMSTIX_AM200EPD
1715         {
1716                 struct fb_event event;
1717                 event.info = fb_info;
1718                 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1719         }
1720 #endif
1721         console_lock();
1722         fbcon_fb_unregistered(fb_info);
1723         console_unlock();
1724
1725         /* this may free fb info */
1726         put_fb_info(fb_info);
1727 }
1728
1729 /**
1730  * remove_conflicting_framebuffers - remove firmware-configured framebuffers
1731  * @a: memory range, users of which are to be removed
1732  * @name: requesting driver name
1733  * @primary: also kick vga16fb if present
1734  *
1735  * This function removes framebuffer devices (initialized by firmware/bootloader)
1736  * which use memory range described by @a. If @a is NULL all such devices are
1737  * removed.
1738  */
1739 int remove_conflicting_framebuffers(struct apertures_struct *a,
1740                                     const char *name, bool primary)
1741 {
1742         bool do_free = false;
1743
1744         if (!a) {
1745                 a = alloc_apertures(1);
1746                 if (!a)
1747                         return -ENOMEM;
1748
1749                 a->ranges[0].base = 0;
1750                 a->ranges[0].size = ~0;
1751                 do_free = true;
1752         }
1753
1754         mutex_lock(&registration_lock);
1755         do_remove_conflicting_framebuffers(a, name, primary);
1756         mutex_unlock(&registration_lock);
1757
1758         if (do_free)
1759                 kfree(a);
1760
1761         return 0;
1762 }
1763 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1764
1765 /**
1766  * remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices
1767  * @pdev: PCI device
1768  * @name: requesting driver name
1769  *
1770  * This function removes framebuffer devices (eg. initialized by firmware)
1771  * using memory range configured for any of @pdev's memory bars.
1772  *
1773  * The function assumes that PCI device with shadowed ROM drives a primary
1774  * display and so kicks out vga16fb.
1775  */
1776 int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, const char *name)
1777 {
1778         struct apertures_struct *ap;
1779         bool primary = false;
1780         int err, idx, bar;
1781
1782         for (idx = 0, bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
1783                 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
1784                         continue;
1785                 idx++;
1786         }
1787
1788         ap = alloc_apertures(idx);
1789         if (!ap)
1790                 return -ENOMEM;
1791
1792         for (idx = 0, bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
1793                 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
1794                         continue;
1795                 ap->ranges[idx].base = pci_resource_start(pdev, bar);
1796                 ap->ranges[idx].size = pci_resource_len(pdev, bar);
1797                 pci_dbg(pdev, "%s: bar %d: 0x%lx -> 0x%lx\n", __func__, bar,
1798                         (unsigned long)pci_resource_start(pdev, bar),
1799                         (unsigned long)pci_resource_end(pdev, bar));
1800                 idx++;
1801         }
1802
1803 #ifdef CONFIG_X86
1804         primary = pdev->resource[PCI_ROM_RESOURCE].flags &
1805                                         IORESOURCE_ROM_SHADOW;
1806 #endif
1807         err = remove_conflicting_framebuffers(ap, name, primary);
1808         kfree(ap);
1809         return err;
1810 }
1811 EXPORT_SYMBOL(remove_conflicting_pci_framebuffers);
1812
1813 /**
1814  *      register_framebuffer - registers a frame buffer device
1815  *      @fb_info: frame buffer info structure
1816  *
1817  *      Registers a frame buffer device @fb_info.
1818  *
1819  *      Returns negative errno on error, or zero for success.
1820  *
1821  */
1822 int
1823 register_framebuffer(struct fb_info *fb_info)
1824 {
1825         int ret;
1826
1827         mutex_lock(&registration_lock);
1828         ret = do_register_framebuffer(fb_info);
1829         mutex_unlock(&registration_lock);
1830
1831         return ret;
1832 }
1833 EXPORT_SYMBOL(register_framebuffer);
1834
1835 /**
1836  *      unregister_framebuffer - releases a frame buffer device
1837  *      @fb_info: frame buffer info structure
1838  *
1839  *      Unregisters a frame buffer device @fb_info.
1840  *
1841  *      Returns negative errno on error, or zero for success.
1842  *
1843  *      This function will also notify the framebuffer console
1844  *      to release the driver.
1845  *
1846  *      This is meant to be called within a driver's module_exit()
1847  *      function. If this is called outside module_exit(), ensure
1848  *      that the driver implements fb_open() and fb_release() to
1849  *      check that no processes are using the device.
1850  */
1851 void
1852 unregister_framebuffer(struct fb_info *fb_info)
1853 {
1854         mutex_lock(&registration_lock);
1855         do_unregister_framebuffer(fb_info);
1856         mutex_unlock(&registration_lock);
1857 }
1858 EXPORT_SYMBOL(unregister_framebuffer);
1859
1860 /**
1861  *      fb_set_suspend - low level driver signals suspend
1862  *      @info: framebuffer affected
1863  *      @state: 0 = resuming, !=0 = suspending
1864  *
1865  *      This is meant to be used by low level drivers to
1866  *      signal suspend/resume to the core & clients.
1867  *      It must be called with the console semaphore held
1868  */
1869 void fb_set_suspend(struct fb_info *info, int state)
1870 {
1871         WARN_CONSOLE_UNLOCKED();
1872
1873         if (state) {
1874                 fbcon_suspended(info);
1875                 info->state = FBINFO_STATE_SUSPENDED;
1876         } else {
1877                 info->state = FBINFO_STATE_RUNNING;
1878                 fbcon_resumed(info);
1879         }
1880 }
1881 EXPORT_SYMBOL(fb_set_suspend);
1882
1883 /**
1884  *      fbmem_init - init frame buffer subsystem
1885  *
1886  *      Initialize the frame buffer subsystem.
1887  *
1888  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1889  *
1890  */
1891
1892 static int __init
1893 fbmem_init(void)
1894 {
1895         int ret;
1896
1897         if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops))
1898                 return -ENOMEM;
1899
1900         ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
1901         if (ret) {
1902                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1903                 goto err_chrdev;
1904         }
1905
1906         fb_class = class_create(THIS_MODULE, "graphics");
1907         if (IS_ERR(fb_class)) {
1908                 ret = PTR_ERR(fb_class);
1909                 pr_warn("Unable to create fb class; errno = %d\n", ret);
1910                 fb_class = NULL;
1911                 goto err_class;
1912         }
1913
1914         fb_console_init();
1915
1916         return 0;
1917
1918 err_class:
1919         unregister_chrdev(FB_MAJOR, "fb");
1920 err_chrdev:
1921         remove_proc_entry("fb", NULL);
1922         return ret;
1923 }
1924
1925 #ifdef MODULE
1926 module_init(fbmem_init);
1927 static void __exit
1928 fbmem_exit(void)
1929 {
1930         fb_console_exit();
1931
1932         remove_proc_entry("fb", NULL);
1933         class_destroy(fb_class);
1934         unregister_chrdev(FB_MAJOR, "fb");
1935 }
1936
1937 module_exit(fbmem_exit);
1938 MODULE_LICENSE("GPL");
1939 MODULE_DESCRIPTION("Framebuffer base");
1940 #else
1941 subsys_initcall(fbmem_init);
1942 #endif
1943
1944 int fb_new_modelist(struct fb_info *info)
1945 {
1946         struct fb_var_screeninfo var = info->var;
1947         struct list_head *pos, *n;
1948         struct fb_modelist *modelist;
1949         struct fb_videomode *m, mode;
1950         int err;
1951
1952         list_for_each_safe(pos, n, &info->modelist) {
1953                 modelist = list_entry(pos, struct fb_modelist, list);
1954                 m = &modelist->mode;
1955                 fb_videomode_to_var(&var, m);
1956                 var.activate = FB_ACTIVATE_TEST;
1957                 err = fb_set_var(info, &var);
1958                 fb_var_to_videomode(&mode, &var);
1959                 if (err || !fb_mode_is_equal(m, &mode)) {
1960                         list_del(pos);
1961                         kfree(pos);
1962                 }
1963         }
1964
1965         if (list_empty(&info->modelist))
1966                 return 1;
1967
1968         fbcon_new_modelist(info);
1969
1970         return 0;
1971 }
1972
1973 MODULE_LICENSE("GPL");