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 EXPORT_SYMBOL(fb_center_logo);
  58
  59 static struct fb_info *get_fb_info(unsigned int idx)
  60 {
  61         struct fb_info *fb_info;
  62
  63         if (idx >= FB_MAX)
  64                 return ERR_PTR(-ENODEV);
  65
  66         mutex_lock(&registration_lock);
  67         fb_info = registered_fb[idx];
  68         if (fb_info)
  69                 atomic_inc(&fb_info->count);
  70         mutex_unlock(&registration_lock);
  71
  72         return fb_info;
  73 }
  74
  75 static void put_fb_info(struct fb_info *fb_info)
  76 {
  77         if (!atomic_dec_and_test(&fb_info->count))
  78                 return;
  79         if (fb_info->fbops->fb_destroy)
  80                 fb_info->fbops->fb_destroy(fb_info);
  81 }
  82
  83 /*
  84  * Helpers
  85  */
  86
  87 int fb_get_color_depth(struct fb_var_screeninfo *var,
  88                        struct fb_fix_screeninfo *fix)
  89 {
  90         int depth = 0;
  91
  92         if (fix->visual == FB_VISUAL_MONO01 ||
  93             fix->visual == FB_VISUAL_MONO10)
  94                 depth = 1;
  95         else {
  96                 if (var->green.length == var->blue.length &&
  97                     var->green.length == var->red.length &&
  98                     var->green.offset == var->blue.offset &&
  99                     var->green.offset == var->red.offset)
 100                         depth = var->green.length;
 101                 else
 102                         depth = var->green.length + var->red.length +
 103                                 var->blue.length;
 104         }
 105
 106         return depth;
 107 }
 108 EXPORT_SYMBOL(fb_get_color_depth);
 109
 110 /*
 111  * Data padding functions.
 112  */
 113 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
 114 {
 115         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
 116 }
 117 EXPORT_SYMBOL(fb_pad_aligned_buffer);
 118
 119 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
 120                                 u32 shift_high, u32 shift_low, u32 mod)
 121 {
 122         u8 mask = (u8) (0xfff << shift_high), tmp;
 123         int i, j;
 124
 125         for (i = height; i--; ) {
 126                 for (j = 0; j < idx; j++) {
 127                         tmp = dst[j];
 128                         tmp &= mask;
 129                         tmp |= *src >> shift_low;
 130                         dst[j] = tmp;
 131                         tmp = *src << shift_high;
 132                         dst[j+1] = tmp;
 133                         src++;
 134                 }
 135                 tmp = dst[idx];
 136                 tmp &= mask;
 137                 tmp |= *src >> shift_low;
 138                 dst[idx] = tmp;
 139                 if (shift_high < mod) {
 140                         tmp = *src << shift_high;
 141                         dst[idx+1] = tmp;
 142                 }
 143                 src++;
 144                 dst += d_pitch;
 145         }
 146 }
 147 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 148
 149 /*
 150  * we need to lock this section since fb_cursor
 151  * may use fb_imageblit()
 152  */
 153 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 154 {
 155         u32 align = buf->buf_align - 1, offset;
 156         char *addr = buf->addr;
 157
 158         /* If IO mapped, we need to sync before access, no sharing of
 159          * the pixmap is done
 160          */
 161         if (buf->flags & FB_PIXMAP_IO) {
 162                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 163                         info->fbops->fb_sync(info);
 164                 return addr;
 165         }
 166
 167         /* See if we fit in the remaining pixmap space */
 168         offset = buf->offset + align;
 169         offset &= ~align;
 170         if (offset + size > buf->size) {
 171                 /* We do not fit. In order to be able to re-use the buffer,
 172                  * we must ensure no asynchronous DMA'ing or whatever operation
 173                  * is in progress, we sync for that.
 174                  */
 175                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 176                         info->fbops->fb_sync(info);
 177                 offset = 0;
 178         }
 179         buf->offset = offset + size;
 180         addr += offset;
 181
 182         return addr;
 183 }
 184 EXPORT_SYMBOL(fb_get_buffer_offset);
 185
 186 #ifdef CONFIG_LOGO
 187
 188 static inline unsigned safe_shift(unsigned d, int n)
 189 {
 190         return n < 0 ? d >> -n : d << n;
 191 }
 192
 193 static void fb_set_logocmap(struct fb_info *info,
 194                                    const struct linux_logo *logo)
 195 {
 196         struct fb_cmap palette_cmap;
 197         u16 palette_green[16];
 198         u16 palette_blue[16];
 199         u16 palette_red[16];
 200         int i, j, n;
 201         const unsigned char *clut = logo->clut;
 202
 203         palette_cmap.start = 0;
 204         palette_cmap.len = 16;
 205         palette_cmap.red = palette_red;
 206         palette_cmap.green = palette_green;
 207         palette_cmap.blue = palette_blue;
 208         palette_cmap.transp = NULL;
 209
 210         for (i = 0; i < logo->clutsize; i += n) {
 211                 n = logo->clutsize - i;
 212                 /* palette_cmap provides space for only 16 colors at once */
 213                 if (n > 16)
 214                         n = 16;
 215                 palette_cmap.start = 32 + i;
 216                 palette_cmap.len = n;
 217                 for (j = 0; j < n; ++j) {
 218                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
 219                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
 220                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 221                         clut += 3;
 222                 }
 223                 fb_set_cmap(&palette_cmap, info);
 224         }
 225 }
 226
 227 static void  fb_set_logo_truepalette(struct fb_info *info,
 228                                             const struct linux_logo *logo,
 229                                             u32 *palette)
 230 {
 231         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 232         unsigned char redmask, greenmask, bluemask;
 233         int redshift, greenshift, blueshift;
 234         int i;
 235         const unsigned char *clut = logo->clut;
 236
 237         /*
 238          * We have to create a temporary palette since console palette is only
 239          * 16 colors long.
 240          */
 241         /* Bug: Doesn't obey msb_right ... (who needs that?) */
 242         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 243         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 244         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 245         redshift   = info->var.red.offset   - (8 - info->var.red.length);
 246         greenshift = info->var.green.offset - (8 - info->var.green.length);
 247         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 248
 249         for ( i = 0; i < logo->clutsize; i++) {
 250                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 251                                  safe_shift((clut[1] & greenmask), greenshift) |
 252                                  safe_shift((clut[2] & bluemask), blueshift));
 253                 clut += 3;
 254         }
 255 }
 256
 257 static void fb_set_logo_directpalette(struct fb_info *info,
 258                                              const struct linux_logo *logo,
 259                                              u32 *palette)
 260 {
 261         int redshift, greenshift, blueshift;
 262         int i;
 263
 264         redshift = info->var.red.offset;
 265         greenshift = info->var.green.offset;
 266         blueshift = info->var.blue.offset;
 267
 268         for (i = 32; i < 32 + logo->clutsize; i++)
 269                 palette[i] = i << redshift | i << greenshift | i << blueshift;
 270 }
 271
 272 static void fb_set_logo(struct fb_info *info,
 273                                const struct linux_logo *logo, u8 *dst,
 274                                int depth)
 275 {
 276         int i, j, k;
 277         const u8 *src = logo->data;
 278         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 279         u8 fg = 1, d;
 280
 281         switch (fb_get_color_depth(&info->var, &info->fix)) {
 282         case 1:
 283                 fg = 1;
 284                 break;
 285         case 2:
 286                 fg = 3;
 287                 break;
 288         default:
 289                 fg = 7;
 290                 break;
 291         }
 292
 293         if (info->fix.visual == FB_VISUAL_MONO01 ||
 294             info->fix.visual == FB_VISUAL_MONO10)
 295                 fg = ~((u8) (0xfff << info->var.green.length));
 296
 297         switch (depth) {
 298         case 4:
 299                 for (i = 0; i < logo->height; i++)
 300                         for (j = 0; j < logo->width; src++) {
 301                                 *dst++ = *src >> 4;
 302                                 j++;
 303                                 if (j < logo->width) {
 304                                         *dst++ = *src & 0x0f;
 305                                         j++;
 306                                 }
 307                         }
 308                 break;
 309         case 1:
 310                 for (i = 0; i < logo->height; i++) {
 311                         for (j = 0; j < logo->width; src++) {
 312                                 d = *src ^ xor;
 313                                 for (k = 7; k >= 0 && j < logo->width; k--) {
 314                                         *dst++ = ((d >> k) & 1) ? fg : 0;
 315                                         j++;
 316                                 }
 317                         }
 318                 }
 319                 break;
 320         }
 321 }
 322
 323 /*
 324  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 325  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 326  * the visual format and color depth of the framebuffer, the DAC, the
 327  * pseudo_palette, and the logo data will be adjusted accordingly.
 328  *
 329  * Case 1 - linux_logo_clut224:
 330  * Color exceeds the number of console colors (16), thus we set the hardware DAC
 331  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 332  *
 333  * For visuals that require color info from the pseudo_palette, we also construct
 334  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 335  * will be set.
 336  *
 337  * Case 2 - linux_logo_vga16:
 338  * The number of colors just matches the console colors, thus there is no need
 339  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 340  * each byte contains color information for two pixels (upper and lower nibble).
 341  * To be consistent with fb_imageblit() usage, we therefore separate the two
 342  * nibbles into separate bytes. The "depth" flag will be set to 4.
 343  *
 344  * Case 3 - linux_logo_mono:
 345  * This is similar with Case 2.  Each byte contains information for 8 pixels.
 346  * We isolate each bit and expand each into a byte. The "depth" flag will
 347  * be set to 1.
 348  */
 349 static struct logo_data {
 350         int depth;
 351         int needs_directpalette;
 352         int needs_truepalette;
 353         int needs_cmapreset;
 354         const struct linux_logo *logo;
 355 } fb_logo __read_mostly;
 356
 357 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 358 {
 359         u32 size = width * height, i;
 360
 361         out += size - 1;
 362
 363         for (i = size; i--; )
 364                 *out-- = *in++;
 365 }
 366
 367 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 368 {
 369         int i, j, h = height - 1;
 370
 371         for (i = 0; i < height; i++)
 372                 for (j = 0; j < width; j++)
 373                                 out[height * j + h - i] = *in++;
 374 }
 375
 376 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 377 {
 378         int i, j, w = width - 1;
 379
 380         for (i = 0; i < height; i++)
 381                 for (j = 0; j < width; j++)
 382                         out[height * (w - j) + i] = *in++;
 383 }
 384
 385 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 386                            struct fb_image *image, int rotate)
 387 {
 388         u32 tmp;
 389
 390         if (rotate == FB_ROTATE_UD) {
 391                 fb_rotate_logo_ud(image->data, dst, image->width,
 392                                   image->height);
 393                 image->dx = info->var.xres - image->width - image->dx;
 394                 image->dy = info->var.yres - image->height - image->dy;
 395         } else if (rotate == FB_ROTATE_CW) {
 396                 fb_rotate_logo_cw(image->data, dst, image->width,
 397                                   image->height);
 398                 tmp = image->width;
 399                 image->width = image->height;
 400                 image->height = tmp;
 401                 tmp = image->dy;
 402                 image->dy = image->dx;
 403                 image->dx = info->var.xres - image->width - tmp;
 404         } else if (rotate == FB_ROTATE_CCW) {
 405                 fb_rotate_logo_ccw(image->data, dst, image->width,
 406                                    image->height);
 407                 tmp = image->width;
 408                 image->width = image->height;
 409                 image->height = tmp;
 410                 tmp = image->dx;
 411                 image->dx = image->dy;
 412                 image->dy = info->var.yres - image->height - tmp;
 413         }
 414
 415         image->data = dst;
 416 }
 417
 418 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 419                             int rotate, unsigned int num)
 420 {
 421         unsigned int x;
 422
 423         if (image->width > info->var.xres || image->height > info->var.yres)
 424                 return;
 425
 426         if (rotate == FB_ROTATE_UR) {
 427                 for (x = 0;
 428                      x < num && image->dx + image->width <= info->var.xres;
 429                      x++) {
 430                         info->fbops->fb_imageblit(info, image);
 431                         image->dx += image->width + 8;
 432                 }
 433         } else if (rotate == FB_ROTATE_UD) {
 434                 u32 dx = image->dx;
 435
 436                 for (x = 0; x < num && image->dx <= dx; x++) {
 437                         info->fbops->fb_imageblit(info, image);
 438                         image->dx -= image->width + 8;
 439                 }
 440         } else if (rotate == FB_ROTATE_CW) {
 441                 for (x = 0;
 442                      x < num && image->dy + image->height <= info->var.yres;
 443                      x++) {
 444                         info->fbops->fb_imageblit(info, image);
 445                         image->dy += image->height + 8;
 446                 }
 447         } else if (rotate == FB_ROTATE_CCW) {
 448                 u32 dy = image->dy;
 449
 450                 for (x = 0; x < num && image->dy <= dy; x++) {
 451                         info->fbops->fb_imageblit(info, image);
 452                         image->dy -= image->height + 8;
 453                 }
 454         }
 455 }
 456
 457 static int fb_show_logo_line(struct fb_info *info, int rotate,
 458                              const struct linux_logo *logo, int y,
 459                              unsigned int n)
 460 {
 461         u32 *palette = NULL, *saved_pseudo_palette = NULL;
 462         unsigned char *logo_new = NULL, *logo_rotate = NULL;
 463         struct fb_image image;
 464
 465         /* Return if the frame buffer is not mapped or suspended */
 466         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
 467             info->fbops->owner)
 468                 return 0;
 469
 470         image.depth = 8;
 471         image.data = logo->data;
 472
 473         if (fb_logo.needs_cmapreset)
 474                 fb_set_logocmap(info, logo);
 475
 476         if (fb_logo.needs_truepalette ||
 477             fb_logo.needs_directpalette) {
 478                 palette = kmalloc(256 * 4, GFP_KERNEL);
 479                 if (palette == NULL)
 480                         return 0;
 481
 482                 if (fb_logo.needs_truepalette)
 483                         fb_set_logo_truepalette(info, logo, palette);
 484                 else
 485                         fb_set_logo_directpalette(info, logo, palette);
 486
 487                 saved_pseudo_palette = info->pseudo_palette;
 488                 info->pseudo_palette = palette;
 489         }
 490
 491         if (fb_logo.depth <= 4) {
 492                 logo_new = kmalloc_array(logo->width, logo->height,
 493                                          GFP_KERNEL);
 494                 if (logo_new == NULL) {
 495                         kfree(palette);
 496                         if (saved_pseudo_palette)
 497                                 info->pseudo_palette = saved_pseudo_palette;
 498                         return 0;
 499                 }
 500                 image.data = logo_new;
 501                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
 502         }
 503
 504         if (fb_center_logo) {
 505                 int xres = info->var.xres;
 506                 int yres = info->var.yres;
 507
 508                 if (rotate == FB_ROTATE_CW || rotate == FB_ROTATE_CCW) {
 509                         xres = info->var.yres;
 510                         yres = info->var.xres;
 511                 }
 512
 513                 while (n && (n * (logo->width + 8) - 8 > xres))
 514                         --n;
 515                 image.dx = (xres - n * (logo->width + 8) - 8) / 2;
 516                 image.dy = y ?: (yres - logo->height) / 2;
 517         } else {
 518                 image.dx = 0;
 519                 image.dy = y;
 520         }
 521
 522         image.width = logo->width;
 523         image.height = logo->height;
 524
 525         if (rotate) {
 526                 logo_rotate = kmalloc_array(logo->width, logo->height,
 527                                             GFP_KERNEL);
 528                 if (logo_rotate)
 529                         fb_rotate_logo(info, logo_rotate, &image, rotate);
 530         }
 531
 532         fb_do_show_logo(info, &image, rotate, n);
 533
 534         kfree(palette);
 535         if (saved_pseudo_palette != NULL)
 536                 info->pseudo_palette = saved_pseudo_palette;
 537         kfree(logo_new);
 538         kfree(logo_rotate);
 539         return image.dy + logo->height;
 540 }
 541
 542
 543 #ifdef CONFIG_FB_LOGO_EXTRA
 544
 545 #define FB_LOGO_EX_NUM_MAX 10
 546 static struct logo_data_extra {
 547         const struct linux_logo *logo;
 548         unsigned int n;
 549 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
 550 static unsigned int fb_logo_ex_num;
 551
 552 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
 553 {
 554         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
 555                 return;
 556
 557         fb_logo_ex[fb_logo_ex_num].logo = logo;
 558         fb_logo_ex[fb_logo_ex_num].n = n;
 559         fb_logo_ex_num++;
 560 }
 561
 562 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
 563                                   unsigned int yres)
 564 {
 565         unsigned int i;
 566
 567         /* FIXME: logo_ex supports only truecolor fb. */
 568         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
 569                 fb_logo_ex_num = 0;
 570
 571         for (i = 0; i < fb_logo_ex_num; i++) {
 572                 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
 573                         fb_logo_ex[i].logo = NULL;
 574                         continue;
 575                 }
 576                 height += fb_logo_ex[i].logo->height;
 577                 if (height > yres) {
 578                         height -= fb_logo_ex[i].logo->height;
 579                         fb_logo_ex_num = i;
 580                         break;
 581                 }
 582         }
 583         return height;
 584 }
 585
 586 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 587 {
 588         unsigned int i;
 589
 590         for (i = 0; i < fb_logo_ex_num; i++)
 591                 y = fb_show_logo_line(info, rotate,
 592                                       fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
 593
 594         return y;
 595 }
 596
 597 #else /* !CONFIG_FB_LOGO_EXTRA */
 598
 599 static inline int fb_prepare_extra_logos(struct fb_info *info,
 600                                          unsigned int height,
 601                                          unsigned int yres)
 602 {
 603         return height;
 604 }
 605
 606 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 607 {
 608         return y;
 609 }
 610
 611 #endif /* CONFIG_FB_LOGO_EXTRA */
 612
 613
 614 int fb_prepare_logo(struct fb_info *info, int rotate)
 615 {
 616         int depth = fb_get_color_depth(&info->var, &info->fix);
 617         unsigned int yres;
 618         int height;
 619
 620         memset(&fb_logo, 0, sizeof(struct logo_data));
 621
 622         if (info->flags & FBINFO_MISC_TILEBLITTING ||
 623             info->fbops->owner)
 624                 return 0;
 625
 626         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 627                 depth = info->var.blue.length;
 628                 if (info->var.red.length < depth)
 629                         depth = info->var.red.length;
 630                 if (info->var.green.length < depth)
 631                         depth = info->var.green.length;
 632         }
 633
 634         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 635                 /* assume console colormap */
 636                 depth = 4;
 637         }
 638
 639         /* Return if no suitable logo was found */
 640         fb_logo.logo = fb_find_logo(depth);
 641
 642         if (!fb_logo.logo) {
 643                 return 0;
 644         }
 645
 646         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 647                 yres = info->var.yres;
 648         else
 649                 yres = info->var.xres;
 650
 651         if (fb_logo.logo->height > yres) {
 652                 fb_logo.logo = NULL;
 653                 return 0;
 654         }
 655
 656         /* What depth we asked for might be different from what we get */
 657         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 658                 fb_logo.depth = 8;
 659         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 660                 fb_logo.depth = 4;
 661         else
 662                 fb_logo.depth = 1;
 663
 664
 665         if (fb_logo.depth > 4 && depth > 4) {
 666                 switch (info->fix.visual) {
 667                 case FB_VISUAL_TRUECOLOR:
 668                         fb_logo.needs_truepalette = 1;
 669                         break;
 670                 case FB_VISUAL_DIRECTCOLOR:
 671                         fb_logo.needs_directpalette = 1;
 672                         fb_logo.needs_cmapreset = 1;
 673                         break;
 674                 case FB_VISUAL_PSEUDOCOLOR:
 675                         fb_logo.needs_cmapreset = 1;
 676                         break;
 677                 }
 678         }
 679
 680         height = fb_logo.logo->height;
 681         if (fb_center_logo)
 682                 height += (yres - fb_logo.logo->height) / 2;
 683
 684         return fb_prepare_extra_logos(info, height, yres);
 685 }
 686
 687 int fb_show_logo(struct fb_info *info, int rotate)
 688 {
 689         int y;
 690
 691         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
 692                               num_online_cpus());
 693         y = fb_show_extra_logos(info, y, rotate);
 694
 695         return y;
 696 }
 697 #else
 698 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 699 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 700 #endif /* CONFIG_LOGO */
 701 EXPORT_SYMBOL(fb_prepare_logo);
 702 EXPORT_SYMBOL(fb_show_logo);
 703
 704 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
 705 {
 706         mutex_lock(&registration_lock);
 707         return (*pos < FB_MAX) ? pos : NULL;
 708 }
 709
 710 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
 711 {
 712         (*pos)++;
 713         return (*pos < FB_MAX) ? pos : NULL;
 714 }
 715
 716 static void fb_seq_stop(struct seq_file *m, void *v)
 717 {
 718         mutex_unlock(&registration_lock);
 719 }
 720
 721 static int fb_seq_show(struct seq_file *m, void *v)
 722 {
 723         int i = *(loff_t *)v;
 724         struct fb_info *fi = registered_fb[i];
 725
 726         if (fi)
 727                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
 728         return 0;
 729 }
 730
 731 static const struct seq_operations proc_fb_seq_ops = {
 732         .start  = fb_seq_start,
 733         .next   = fb_seq_next,
 734         .stop   = fb_seq_stop,
 735         .show   = fb_seq_show,
 736 };
 737
 738 /*
 739  * We hold a reference to the fb_info in file->private_data,
 740  * but if the current registered fb has changed, we don't
 741  * actually want to use it.
 742  *
 743  * So look up the fb_info using the inode minor number,
 744  * and just verify it against the reference we have.
 745  */
 746 static struct fb_info *file_fb_info(struct file *file)
 747 {
 748         struct inode *inode = file_inode(file);
 749         int fbidx = iminor(inode);
 750         struct fb_info *info = registered_fb[fbidx];
 751
 752         if (info != file->private_data)
 753                 info = NULL;
 754         return info;
 755 }
 756
 757 static ssize_t
 758 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 759 {
 760         unsigned long p = *ppos;
 761         struct fb_info *info = file_fb_info(file);
 762         u8 *buffer, *dst;
 763         u8 __iomem *src;
 764         int c, cnt = 0, err = 0;
 765         unsigned long total_size;
 766
 767         if (!info || ! info->screen_base)
 768                 return -ENODEV;
 769
 770         if (info->state != FBINFO_STATE_RUNNING)
 771                 return -EPERM;
 772
 773         if (info->fbops->fb_read)
 774                 return info->fbops->fb_read(info, buf, count, ppos);
 775
 776         total_size = info->screen_size;
 777
 778         if (total_size == 0)
 779                 total_size = info->fix.smem_len;
 780
 781         if (p >= total_size)
 782                 return 0;
 783
 784         if (count >= total_size)
 785                 count = total_size;
 786
 787         if (count + p > total_size)
 788                 count = total_size - p;
 789
 790         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 791                          GFP_KERNEL);
 792         if (!buffer)
 793                 return -ENOMEM;
 794
 795         src = (u8 __iomem *) (info->screen_base + p);
 796
 797         if (info->fbops->fb_sync)
 798                 info->fbops->fb_sync(info);
 799
 800         while (count) {
 801                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 802                 dst = buffer;
 803                 fb_memcpy_fromfb(dst, src, c);
 804                 dst += c;
 805                 src += c;
 806
 807                 if (copy_to_user(buf, buffer, c)) {
 808                         err = -EFAULT;
 809                         break;
 810                 }
 811                 *ppos += c;
 812                 buf += c;
 813                 cnt += c;
 814                 count -= c;
 815         }
 816
 817         kfree(buffer);
 818
 819         return (err) ? err : cnt;
 820 }
 821
 822 static ssize_t
 823 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 824 {
 825         unsigned long p = *ppos;
 826         struct fb_info *info = file_fb_info(file);
 827         u8 *buffer, *src;
 828         u8 __iomem *dst;
 829         int c, cnt = 0, err = 0;
 830         unsigned long total_size;
 831
 832         if (!info || !info->screen_base)
 833                 return -ENODEV;
 834
 835         if (info->state != FBINFO_STATE_RUNNING)
 836                 return -EPERM;
 837
 838         if (info->fbops->fb_write)
 839                 return info->fbops->fb_write(info, buf, count, ppos);
 840
 841         total_size = info->screen_size;
 842
 843         if (total_size == 0)
 844                 total_size = info->fix.smem_len;
 845
 846         if (p > total_size)
 847                 return -EFBIG;
 848
 849         if (count > total_size) {
 850                 err = -EFBIG;
 851                 count = total_size;
 852         }
 853
 854         if (count + p > total_size) {
 855                 if (!err)
 856                         err = -ENOSPC;
 857
 858                 count = total_size - p;
 859         }
 860
 861         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 862                          GFP_KERNEL);
 863         if (!buffer)
 864                 return -ENOMEM;
 865
 866         dst = (u8 __iomem *) (info->screen_base + p);
 867
 868         if (info->fbops->fb_sync)
 869                 info->fbops->fb_sync(info);
 870
 871         while (count) {
 872                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 873                 src = buffer;
 874
 875                 if (copy_from_user(src, buf, c)) {
 876                         err = -EFAULT;
 877                         break;
 878                 }
 879
 880                 fb_memcpy_tofb(dst, src, c);
 881                 dst += c;
 882                 src += c;
 883                 *ppos += c;
 884                 buf += c;
 885                 cnt += c;
 886                 count -= c;
 887         }
 888
 889         kfree(buffer);
 890
 891         return (cnt) ? cnt : err;
 892 }
 893
 894 int
 895 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 896 {
 897         struct fb_fix_screeninfo *fix = &info->fix;
 898         unsigned int yres = info->var.yres;
 899         int err = 0;
 900
 901         if (var->yoffset > 0) {
 902                 if (var->vmode & FB_VMODE_YWRAP) {
 903                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 904                                 err = -EINVAL;
 905                         else
 906                                 yres = 0;
 907                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 908                         err = -EINVAL;
 909         }
 910
 911         if (var->xoffset > 0 && (!fix->xpanstep ||
 912                                  (var->xoffset % fix->xpanstep)))
 913                 err = -EINVAL;
 914
 915         if (err || !info->fbops->fb_pan_display ||
 916             var->yoffset > info->var.yres_virtual - yres ||
 917             var->xoffset > info->var.xres_virtual - info->var.xres)
 918                 return -EINVAL;
 919
 920         if ((err = info->fbops->fb_pan_display(var, info)))
 921                 return err;
 922         info->var.xoffset = var->xoffset;
 923         info->var.yoffset = var->yoffset;
 924         if (var->vmode & FB_VMODE_YWRAP)
 925                 info->var.vmode |= FB_VMODE_YWRAP;
 926         else
 927                 info->var.vmode &= ~FB_VMODE_YWRAP;
 928         return 0;
 929 }
 930 EXPORT_SYMBOL(fb_pan_display);
 931
 932 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
 933                          u32 activate)
 934 {
 935         struct fb_blit_caps caps, fbcaps;
 936         int err = 0;
 937
 938         memset(&caps, 0, sizeof(caps));
 939         memset(&fbcaps, 0, sizeof(fbcaps));
 940         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
 941         fbcon_get_requirement(info, &caps);
 942         info->fbops->fb_get_caps(info, &fbcaps, var);
 943
 944         if (((fbcaps.x ^ caps.x) & caps.x) ||
 945             ((fbcaps.y ^ caps.y) & caps.y) ||
 946             (fbcaps.len < caps.len))
 947                 err = -EINVAL;
 948
 949         return err;
 950 }
 951
 952 int
 953 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 954 {
 955         int flags = info->flags;
 956         int ret = 0;
 957         u32 activate;
 958         struct fb_var_screeninfo old_var;
 959         struct fb_videomode mode;
 960         struct fb_event event;
 961
 962         if (var->activate & FB_ACTIVATE_INV_MODE) {
 963                 struct fb_videomode mode1, mode2;
 964
 965                 fb_var_to_videomode(&mode1, var);
 966                 fb_var_to_videomode(&mode2, &info->var);
 967                 /* make sure we don't delete the videomode of current var */
 968                 ret = fb_mode_is_equal(&mode1, &mode2);
 969
 970                 if (!ret)
 971                         fbcon_mode_deleted(info, &mode1);
 972
 973                 if (!ret)
 974                         fb_delete_videomode(&mode1, &info->modelist);
 975
 976
 977                 return ret ? -EINVAL : 0;
 978         }
 979
 980         if (!(var->activate & FB_ACTIVATE_FORCE) &&
 981             !memcmp(&info->var, var, sizeof(struct fb_var_screeninfo)))
 982                 return 0;
 983
 984         activate = var->activate;
 985
 986         /* When using FOURCC mode, make sure the red, green, blue and
 987          * transp fields are set to 0.
 988          */
 989         if ((info->fix.capabilities & FB_CAP_FOURCC) &&
 990             var->grayscale > 1) {
 991                 if (var->red.offset     || var->green.offset    ||
 992                     var->blue.offset    || var->transp.offset   ||
 993                     var->red.length     || var->green.length    ||
 994                     var->blue.length    || var->transp.length   ||
 995                     var->red.msb_right  || var->green.msb_right ||
 996                     var->blue.msb_right || var->transp.msb_right)
 997                         return -EINVAL;
 998         }
 999
1000         if (!info->fbops->fb_check_var) {
1001                 *var = info->var;
1002                 return 0;
1003         }
1004
1005         ret = info->fbops->fb_check_var(var, info);
1006
1007         if (ret)
1008                 return ret;
1009
1010         if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW)
1011                 return 0;
1012
1013         if (info->fbops->fb_get_caps) {
1014                 ret = fb_check_caps(info, var, activate);
1015
1016                 if (ret)
1017                         return ret;
1018         }
1019
1020         old_var = info->var;
1021         info->var = *var;
1022
1023         if (info->fbops->fb_set_par) {
1024                 ret = info->fbops->fb_set_par(info);
1025
1026                 if (ret) {
1027                         info->var = old_var;
1028                         printk(KERN_WARNING "detected "
1029                                 "fb_set_par error, "
1030                                 "error code: %d\n", ret);
1031                         return ret;
1032                 }
1033         }
1034
1035         fb_pan_display(info, &info->var);
1036         fb_set_cmap(&info->cmap, info);
1037         fb_var_to_videomode(&mode, &info->var);
1038
1039         if (info->modelist.prev && info->modelist.next &&
1040             !list_empty(&info->modelist))
1041                 ret = fb_add_videomode(&mode, &info->modelist);
1042
1043         if (ret)
1044                 return ret;
1045
1046         event.info = info;
1047         event.data = &mode;
1048         fb_notifier_call_chain(FB_EVENT_MODE_CHANGE, &event);
1049
1050         if (flags & FBINFO_MISC_USEREVENT)
1051                 fbcon_update_vcs(info, activate & FB_ACTIVATE_ALL);
1052
1053         return 0;
1054 }
1055 EXPORT_SYMBOL(fb_set_var);
1056
1057 int
1058 fb_blank(struct fb_info *info, int blank)
1059 {
1060         struct fb_event event;
1061         int ret = -EINVAL;
1062
1063         if (blank > FB_BLANK_POWERDOWN)
1064                 blank = FB_BLANK_POWERDOWN;
1065
1066         event.info = info;
1067         event.data = &blank;
1068
1069         if (info->fbops->fb_blank)
1070                 ret = info->fbops->fb_blank(blank, info);
1071
1072         if (!ret)
1073                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1074
1075         return ret;
1076 }
1077 EXPORT_SYMBOL(fb_blank);
1078
1079 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1080                         unsigned long arg)
1081 {
1082         const struct fb_ops *fb;
1083         struct fb_var_screeninfo var;
1084         struct fb_fix_screeninfo fix;
1085         struct fb_cmap cmap_from;
1086         struct fb_cmap_user cmap;
1087         void __user *argp = (void __user *)arg;
1088         long ret = 0;
1089
1090         switch (cmd) {
1091         case FBIOGET_VSCREENINFO:
1092                 lock_fb_info(info);
1093                 var = info->var;
1094                 unlock_fb_info(info);
1095
1096                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1097                 break;
1098         case FBIOPUT_VSCREENINFO:
1099                 if (copy_from_user(&var, argp, sizeof(var)))
1100                         return -EFAULT;
1101                 console_lock();
1102                 lock_fb_info(info);
1103                 info->flags |= FBINFO_MISC_USEREVENT;
1104                 ret = fb_set_var(info, &var);
1105                 info->flags &= ~FBINFO_MISC_USEREVENT;
1106                 unlock_fb_info(info);
1107                 console_unlock();
1108                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1109                         ret = -EFAULT;
1110                 break;
1111         case FBIOGET_FSCREENINFO:
1112                 lock_fb_info(info);
1113                 fix = info->fix;
1114                 if (info->flags & FBINFO_HIDE_SMEM_START)
1115                         fix.smem_start = 0;
1116                 unlock_fb_info(info);
1117
1118                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1119                 break;
1120         case FBIOPUTCMAP:
1121                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1122                         return -EFAULT;
1123                 ret = fb_set_user_cmap(&cmap, info);
1124                 break;
1125         case FBIOGETCMAP:
1126                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1127                         return -EFAULT;
1128                 lock_fb_info(info);
1129                 cmap_from = info->cmap;
1130                 unlock_fb_info(info);
1131                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1132                 break;
1133         case FBIOPAN_DISPLAY:
1134                 if (copy_from_user(&var, argp, sizeof(var)))
1135                         return -EFAULT;
1136                 console_lock();
1137                 lock_fb_info(info);
1138                 ret = fb_pan_display(info, &var);
1139                 unlock_fb_info(info);
1140                 console_unlock();
1141                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1142                         return -EFAULT;
1143                 break;
1144         case FBIO_CURSOR:
1145                 ret = -EINVAL;
1146                 break;
1147         case FBIOGET_CON2FBMAP:
1148                 ret = fbcon_get_con2fb_map_ioctl(argp);
1149                 break;
1150         case FBIOPUT_CON2FBMAP:
1151                 ret = fbcon_set_con2fb_map_ioctl(argp);
1152                 break;
1153         case FBIOBLANK:
1154                 console_lock();
1155                 lock_fb_info(info);
1156                 ret = fb_blank(info, arg);
1157                 /* might again call into fb_blank */
1158                 fbcon_fb_blanked(info, arg);
1159                 unlock_fb_info(info);
1160                 console_unlock();
1161                 break;
1162         default:
1163                 lock_fb_info(info);
1164                 fb = info->fbops;
1165                 if (fb->fb_ioctl)
1166                         ret = fb->fb_ioctl(info, cmd, arg);
1167                 else
1168                         ret = -ENOTTY;
1169                 unlock_fb_info(info);
1170         }
1171         return ret;
1172 }
1173
1174 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1175 {
1176         struct fb_info *info = file_fb_info(file);
1177
1178         if (!info)
1179                 return -ENODEV;
1180         return do_fb_ioctl(info, cmd, arg);
1181 }
1182
1183 #ifdef CONFIG_COMPAT
1184 struct fb_fix_screeninfo32 {
1185         char                    id[16];
1186         compat_caddr_t          smem_start;
1187         u32                     smem_len;
1188         u32                     type;
1189         u32                     type_aux;
1190         u32                     visual;
1191         u16                     xpanstep;
1192         u16                     ypanstep;
1193         u16                     ywrapstep;
1194         u32                     line_length;
1195         compat_caddr_t          mmio_start;
1196         u32                     mmio_len;
1197         u32                     accel;
1198         u16                     reserved[3];
1199 };
1200
1201 struct fb_cmap32 {
1202         u32                     start;
1203         u32                     len;
1204         compat_caddr_t  red;
1205         compat_caddr_t  green;
1206         compat_caddr_t  blue;
1207         compat_caddr_t  transp;
1208 };
1209
1210 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1211                           unsigned long arg)
1212 {
1213         struct fb_cmap_user __user *cmap;
1214         struct fb_cmap32 __user *cmap32;
1215         __u32 data;
1216         int err;
1217
1218         cmap = compat_alloc_user_space(sizeof(*cmap));
1219         cmap32 = compat_ptr(arg);
1220
1221         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1222                 return -EFAULT;
1223
1224         if (get_user(data, &cmap32->red) ||
1225             put_user(compat_ptr(data), &cmap->red) ||
1226             get_user(data, &cmap32->green) ||
1227             put_user(compat_ptr(data), &cmap->green) ||
1228             get_user(data, &cmap32->blue) ||
1229             put_user(compat_ptr(data), &cmap->blue) ||
1230             get_user(data, &cmap32->transp) ||
1231             put_user(compat_ptr(data), &cmap->transp))
1232                 return -EFAULT;
1233
1234         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1235
1236         if (!err) {
1237                 if (copy_in_user(&cmap32->start,
1238                                  &cmap->start,
1239                                  2 * sizeof(__u32)))
1240                         err = -EFAULT;
1241         }
1242         return err;
1243 }
1244
1245 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1246                                   struct fb_fix_screeninfo32 __user *fix32)
1247 {
1248         __u32 data;
1249         int err;
1250
1251         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1252
1253         data = (__u32) (unsigned long) fix->smem_start;
1254         err |= put_user(data, &fix32->smem_start);
1255
1256         err |= put_user(fix->smem_len, &fix32->smem_len);
1257         err |= put_user(fix->type, &fix32->type);
1258         err |= put_user(fix->type_aux, &fix32->type_aux);
1259         err |= put_user(fix->visual, &fix32->visual);
1260         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1261         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1262         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1263         err |= put_user(fix->line_length, &fix32->line_length);
1264
1265         data = (__u32) (unsigned long) fix->mmio_start;
1266         err |= put_user(data, &fix32->mmio_start);
1267
1268         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1269         err |= put_user(fix->accel, &fix32->accel);
1270         err |= copy_to_user(fix32->reserved, fix->reserved,
1271                             sizeof(fix->reserved));
1272
1273         if (err)
1274                 return -EFAULT;
1275         return 0;
1276 }
1277
1278 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1279                               unsigned long arg)
1280 {
1281         struct fb_fix_screeninfo fix;
1282
1283         lock_fb_info(info);
1284         fix = info->fix;
1285         if (info->flags & FBINFO_HIDE_SMEM_START)
1286                 fix.smem_start = 0;
1287         unlock_fb_info(info);
1288         return do_fscreeninfo_to_user(&fix, compat_ptr(arg));
1289 }
1290
1291 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1292                             unsigned long arg)
1293 {
1294         struct fb_info *info = file_fb_info(file);
1295         const struct fb_ops *fb;
1296         long ret = -ENOIOCTLCMD;
1297
1298         if (!info)
1299                 return -ENODEV;
1300         fb = info->fbops;
1301         switch(cmd) {
1302         case FBIOGET_VSCREENINFO:
1303         case FBIOPUT_VSCREENINFO:
1304         case FBIOPAN_DISPLAY:
1305         case FBIOGET_CON2FBMAP:
1306         case FBIOPUT_CON2FBMAP:
1307                 arg = (unsigned long) compat_ptr(arg);
1308                 /* fall through */
1309         case FBIOBLANK:
1310                 ret = do_fb_ioctl(info, cmd, arg);
1311                 break;
1312
1313         case FBIOGET_FSCREENINFO:
1314                 ret = fb_get_fscreeninfo(info, cmd, arg);
1315                 break;
1316
1317         case FBIOGETCMAP:
1318         case FBIOPUTCMAP:
1319                 ret = fb_getput_cmap(info, cmd, arg);
1320                 break;
1321
1322         default:
1323                 if (fb->fb_compat_ioctl)
1324                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1325                 break;
1326         }
1327         return ret;
1328 }
1329 #endif
1330
1331 static int
1332 fb_mmap(struct file *file, struct vm_area_struct * vma)
1333 {
1334         struct fb_info *info = file_fb_info(file);
1335         int (*fb_mmap_fn)(struct fb_info *info, struct vm_area_struct *vma);
1336         unsigned long mmio_pgoff;
1337         unsigned long start;
1338         u32 len;
1339
1340         if (!info)
1341                 return -ENODEV;
1342         mutex_lock(&info->mm_lock);
1343
1344         fb_mmap_fn = info->fbops->fb_mmap;
1345
1346 #if IS_ENABLED(CONFIG_FB_DEFERRED_IO)
1347         if (info->fbdefio)
1348                 fb_mmap_fn = fb_deferred_io_mmap;
1349 #endif
1350
1351         if (fb_mmap_fn) {
1352                 int res;
1353
1354                 /*
1355                  * The framebuffer needs to be accessed decrypted, be sure
1356                  * SME protection is removed ahead of the call
1357                  */
1358                 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1359                 res = fb_mmap_fn(info, vma);
1360                 mutex_unlock(&info->mm_lock);
1361                 return res;
1362         }
1363
1364         /*
1365          * Ugh. This can be either the frame buffer mapping, or
1366          * if pgoff points past it, the mmio mapping.
1367          */
1368         start = info->fix.smem_start;
1369         len = info->fix.smem_len;
1370         mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1371         if (vma->vm_pgoff >= mmio_pgoff) {
1372                 if (info->var.accel_flags) {
1373                         mutex_unlock(&info->mm_lock);
1374                         return -EINVAL;
1375                 }
1376
1377                 vma->vm_pgoff -= mmio_pgoff;
1378                 start = info->fix.mmio_start;
1379                 len = info->fix.mmio_len;
1380         }
1381         mutex_unlock(&info->mm_lock);
1382
1383         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1384         /*
1385          * The framebuffer needs to be accessed decrypted, be sure
1386          * SME protection is removed
1387          */
1388         vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1389         fb_pgprotect(file, vma, start);
1390
1391         return vm_iomap_memory(vma, start, len);
1392 }
1393
1394 static int
1395 fb_open(struct inode *inode, struct file *file)
1396 __acquires(&info->lock)
1397 __releases(&info->lock)
1398 {
1399         int fbidx = iminor(inode);
1400         struct fb_info *info;
1401         int res = 0;
1402
1403         info = get_fb_info(fbidx);
1404         if (!info) {
1405                 request_module("fb%d", fbidx);
1406                 info = get_fb_info(fbidx);
1407                 if (!info)
1408                         return -ENODEV;
1409         }
1410         if (IS_ERR(info))
1411                 return PTR_ERR(info);
1412
1413         lock_fb_info(info);
1414         if (!try_module_get(info->fbops->owner)) {
1415                 res = -ENODEV;
1416                 goto out;
1417         }
1418         file->private_data = info;
1419         if (info->fbops->fb_open) {
1420                 res = info->fbops->fb_open(info,1);
1421                 if (res)
1422                         module_put(info->fbops->owner);
1423         }
1424 #ifdef CONFIG_FB_DEFERRED_IO
1425         if (info->fbdefio)
1426                 fb_deferred_io_open(info, inode, file);
1427 #endif
1428 out:
1429         unlock_fb_info(info);
1430         if (res)
1431                 put_fb_info(info);
1432         return res;
1433 }
1434
1435 static int
1436 fb_release(struct inode *inode, struct file *file)
1437 __acquires(&info->lock)
1438 __releases(&info->lock)
1439 {
1440         struct fb_info * const info = file->private_data;
1441
1442         lock_fb_info(info);
1443         if (info->fbops->fb_release)
1444                 info->fbops->fb_release(info,1);
1445         module_put(info->fbops->owner);
1446         unlock_fb_info(info);
1447         put_fb_info(info);
1448         return 0;
1449 }
1450
1451 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU)
1452 unsigned long get_fb_unmapped_area(struct file *filp,
1453                                    unsigned long addr, unsigned long len,
1454                                    unsigned long pgoff, unsigned long flags)
1455 {
1456         struct fb_info * const info = filp->private_data;
1457         unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
1458
1459         if (pgoff > fb_size || len > fb_size - pgoff)
1460                 return -EINVAL;
1461
1462         return (unsigned long)info->screen_base + pgoff;
1463 }
1464 #endif
1465
1466 static const struct file_operations fb_fops = {
1467         .owner =        THIS_MODULE,
1468         .read =         fb_read,
1469         .write =        fb_write,
1470         .unlocked_ioctl = fb_ioctl,
1471 #ifdef CONFIG_COMPAT
1472         .compat_ioctl = fb_compat_ioctl,
1473 #endif
1474         .mmap =         fb_mmap,
1475         .open =         fb_open,
1476         .release =      fb_release,
1477 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \
1478         (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \
1479          !defined(CONFIG_MMU))
1480         .get_unmapped_area = get_fb_unmapped_area,
1481 #endif
1482 #ifdef CONFIG_FB_DEFERRED_IO
1483         .fsync =        fb_deferred_io_fsync,
1484 #endif
1485         .llseek =       default_llseek,
1486 };
1487
1488 struct class *fb_class;
1489 EXPORT_SYMBOL(fb_class);
1490
1491 static int fb_check_foreignness(struct fb_info *fi)
1492 {
1493         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1494
1495         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1496
1497 #ifdef __BIG_ENDIAN
1498         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1499 #else
1500         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1501 #endif /* __BIG_ENDIAN */
1502
1503         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1504                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1505                        "support this framebuffer\n", fi->fix.id);
1506                 return -ENOSYS;
1507         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1508                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1509                        "support this framebuffer\n", fi->fix.id);
1510                 return -ENOSYS;
1511         }
1512
1513         return 0;
1514 }
1515
1516 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1517 {
1518         /* is the generic aperture base the same as the HW one */
1519         if (gen->base == hw->base)
1520                 return true;
1521         /* is the generic aperture base inside the hw base->hw base+size */
1522         if (gen->base > hw->base && gen->base < hw->base + hw->size)
1523                 return true;
1524         return false;
1525 }
1526
1527 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1528                                     struct apertures_struct *hwa)
1529 {
1530         int i, j;
1531         if (!hwa || !gena)
1532                 return false;
1533
1534         for (i = 0; i < hwa->count; ++i) {
1535                 struct aperture *h = &hwa->ranges[i];
1536                 for (j = 0; j < gena->count; ++j) {
1537                         struct aperture *g = &gena->ranges[j];
1538                         printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1539                                 (unsigned long long)g->base,
1540                                 (unsigned long long)g->size,
1541                                 (unsigned long long)h->base,
1542                                 (unsigned long long)h->size);
1543                         if (apertures_overlap(g, h))
1544                                 return true;
1545                 }
1546         }
1547
1548         return false;
1549 }
1550
1551 static void do_unregister_framebuffer(struct fb_info *fb_info);
1552
1553 #define VGA_FB_PHYS 0xA0000
1554 static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
1555                                                const char *name, bool primary)
1556 {
1557         int i;
1558
1559         /* check all firmware fbs and kick off if the base addr overlaps */
1560         for_each_registered_fb(i) {
1561                 struct apertures_struct *gen_aper;
1562
1563                 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1564                         continue;
1565
1566                 gen_aper = registered_fb[i]->apertures;
1567                 if (fb_do_apertures_overlap(gen_aper, a) ||
1568                         (primary && gen_aper && gen_aper->count &&
1569                          gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1570
1571                         printk(KERN_INFO "fb%d: switching to %s from %s\n",
1572                                i, name, registered_fb[i]->fix.id);
1573                         do_unregister_framebuffer(registered_fb[i]);
1574                 }
1575         }
1576 }
1577
1578 static bool lockless_register_fb;
1579 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
1580 MODULE_PARM_DESC(lockless_register_fb,
1581         "Lockless framebuffer registration for debugging [default=off]");
1582
1583 static int do_register_framebuffer(struct fb_info *fb_info)
1584 {
1585         int i, ret;
1586         struct fb_videomode mode;
1587
1588         if (fb_check_foreignness(fb_info))
1589                 return -ENOSYS;
1590
1591         do_remove_conflicting_framebuffers(fb_info->apertures,
1592                                            fb_info->fix.id,
1593                                            fb_is_primary_device(fb_info));
1594
1595         if (num_registered_fb == FB_MAX)
1596                 return -ENXIO;
1597
1598         num_registered_fb++;
1599         for (i = 0 ; i < FB_MAX; i++)
1600                 if (!registered_fb[i])
1601                         break;
1602         fb_info->node = i;
1603         atomic_set(&fb_info->count, 1);
1604         mutex_init(&fb_info->lock);
1605         mutex_init(&fb_info->mm_lock);
1606
1607         fb_info->dev = device_create(fb_class, fb_info->device,
1608                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1609         if (IS_ERR(fb_info->dev)) {
1610                 /* Not fatal */
1611                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1612                 fb_info->dev = NULL;
1613         } else
1614                 fb_init_device(fb_info);
1615
1616         if (fb_info->pixmap.addr == NULL) {
1617                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1618                 if (fb_info->pixmap.addr) {
1619                         fb_info->pixmap.size = FBPIXMAPSIZE;
1620                         fb_info->pixmap.buf_align = 1;
1621                         fb_info->pixmap.scan_align = 1;
1622                         fb_info->pixmap.access_align = 32;
1623                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1624                 }
1625         }
1626         fb_info->pixmap.offset = 0;
1627
1628         if (!fb_info->pixmap.blit_x)
1629                 fb_info->pixmap.blit_x = ~(u32)0;
1630
1631         if (!fb_info->pixmap.blit_y)
1632                 fb_info->pixmap.blit_y = ~(u32)0;
1633
1634         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1635                 INIT_LIST_HEAD(&fb_info->modelist);
1636
1637         if (fb_info->skip_vt_switch)
1638                 pm_vt_switch_required(fb_info->dev, false);
1639         else
1640                 pm_vt_switch_required(fb_info->dev, true);
1641
1642         fb_var_to_videomode(&mode, &fb_info->var);
1643         fb_add_videomode(&mode, &fb_info->modelist);
1644         registered_fb[i] = fb_info;
1645
1646 #ifdef CONFIG_GUMSTIX_AM200EPD
1647         {
1648                 struct fb_event event;
1649                 event.info = fb_info;
1650                 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1651         }
1652 #endif
1653
1654         if (!lockless_register_fb)
1655                 console_lock();
1656         else
1657                 atomic_inc(&ignore_console_lock_warning);
1658         lock_fb_info(fb_info);
1659         ret = fbcon_fb_registered(fb_info);
1660         unlock_fb_info(fb_info);
1661
1662         if (!lockless_register_fb)
1663                 console_unlock();
1664         else
1665                 atomic_dec(&ignore_console_lock_warning);
1666         return ret;
1667 }
1668
1669 static void unbind_console(struct fb_info *fb_info)
1670 {
1671         int i = fb_info->node;
1672
1673         if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1674                 return;
1675
1676         console_lock();
1677         lock_fb_info(fb_info);
1678         fbcon_fb_unbind(fb_info);
1679         unlock_fb_info(fb_info);
1680         console_unlock();
1681 }
1682
1683 static void unlink_framebuffer(struct fb_info *fb_info)
1684 {
1685         int i;
1686
1687         i = fb_info->node;
1688         if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1689                 return;
1690
1691         if (!fb_info->dev)
1692                 return;
1693
1694         device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1695
1696         pm_vt_switch_unregister(fb_info->dev);
1697
1698         unbind_console(fb_info);
1699
1700         fb_info->dev = NULL;
1701 }
1702
1703 static void do_unregister_framebuffer(struct fb_info *fb_info)
1704 {
1705         unlink_framebuffer(fb_info);
1706         if (fb_info->pixmap.addr &&
1707             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1708                 kfree(fb_info->pixmap.addr);
1709         fb_destroy_modelist(&fb_info->modelist);
1710         registered_fb[fb_info->node] = NULL;
1711         num_registered_fb--;
1712         fb_cleanup_device(fb_info);
1713 #ifdef CONFIG_GUMSTIX_AM200EPD
1714         {
1715                 struct fb_event event;
1716                 event.info = fb_info;
1717                 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1718         }
1719 #endif
1720         console_lock();
1721         fbcon_fb_unregistered(fb_info);
1722         console_unlock();
1723
1724         /* this may free fb info */
1725         put_fb_info(fb_info);
1726 }
1727
1728 /**
1729  * remove_conflicting_framebuffers - remove firmware-configured framebuffers
1730  * @a: memory range, users of which are to be removed
1731  * @name: requesting driver name
1732  * @primary: also kick vga16fb if present
1733  *
1734  * This function removes framebuffer devices (initialized by firmware/bootloader)
1735  * which use memory range described by @a. If @a is NULL all such devices are
1736  * removed.
1737  */
1738 int remove_conflicting_framebuffers(struct apertures_struct *a,
1739                                     const char *name, bool primary)
1740 {
1741         bool do_free = false;
1742
1743         if (!a) {
1744                 a = alloc_apertures(1);
1745                 if (!a)
1746                         return -ENOMEM;
1747
1748                 a->ranges[0].base = 0;
1749                 a->ranges[0].size = ~0;
1750                 do_free = true;
1751         }
1752
1753         mutex_lock(&registration_lock);
1754         do_remove_conflicting_framebuffers(a, name, primary);
1755         mutex_unlock(&registration_lock);
1756
1757         if (do_free)
1758                 kfree(a);
1759
1760         return 0;
1761 }
1762 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1763
1764 /**
1765  * remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices
1766  * @pdev: PCI device
1767  * @name: requesting driver name
1768  *
1769  * This function removes framebuffer devices (eg. initialized by firmware)
1770  * using memory range configured for any of @pdev's memory bars.
1771  *
1772  * The function assumes that PCI device with shadowed ROM drives a primary
1773  * display and so kicks out vga16fb.
1774  */
1775 int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, const char *name)
1776 {
1777         struct apertures_struct *ap;
1778         bool primary = false;
1779         int err, idx, bar;
1780
1781         for (idx = 0, bar = 0; bar < PCI_ROM_RESOURCE; bar++) {
1782                 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
1783                         continue;
1784                 idx++;
1785         }
1786
1787         ap = alloc_apertures(idx);
1788         if (!ap)
1789                 return -ENOMEM;
1790
1791         for (idx = 0, bar = 0; bar < PCI_ROM_RESOURCE; bar++) {
1792                 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
1793                         continue;
1794                 ap->ranges[idx].base = pci_resource_start(pdev, bar);
1795                 ap->ranges[idx].size = pci_resource_len(pdev, bar);
1796                 pci_dbg(pdev, "%s: bar %d: 0x%lx -> 0x%lx\n", __func__, bar,
1797                         (unsigned long)pci_resource_start(pdev, bar),
1798                         (unsigned long)pci_resource_end(pdev, bar));
1799                 idx++;
1800         }
1801
1802 #ifdef CONFIG_X86
1803         primary = pdev->resource[PCI_ROM_RESOURCE].flags &
1804                                         IORESOURCE_ROM_SHADOW;
1805 #endif
1806         err = remove_conflicting_framebuffers(ap, name, primary);
1807         kfree(ap);
1808         return err;
1809 }
1810 EXPORT_SYMBOL(remove_conflicting_pci_framebuffers);
1811
1812 /**
1813  *      register_framebuffer - registers a frame buffer device
1814  *      @fb_info: frame buffer info structure
1815  *
1816  *      Registers a frame buffer device @fb_info.
1817  *
1818  *      Returns negative errno on error, or zero for success.
1819  *
1820  */
1821 int
1822 register_framebuffer(struct fb_info *fb_info)
1823 {
1824         int ret;
1825
1826         mutex_lock(&registration_lock);
1827         ret = do_register_framebuffer(fb_info);
1828         mutex_unlock(&registration_lock);
1829
1830         return ret;
1831 }
1832 EXPORT_SYMBOL(register_framebuffer);
1833
1834 /**
1835  *      unregister_framebuffer - releases a frame buffer device
1836  *      @fb_info: frame buffer info structure
1837  *
1838  *      Unregisters a frame buffer device @fb_info.
1839  *
1840  *      Returns negative errno on error, or zero for success.
1841  *
1842  *      This function will also notify the framebuffer console
1843  *      to release the driver.
1844  *
1845  *      This is meant to be called within a driver's module_exit()
1846  *      function. If this is called outside module_exit(), ensure
1847  *      that the driver implements fb_open() and fb_release() to
1848  *      check that no processes are using the device.
1849  */
1850 void
1851 unregister_framebuffer(struct fb_info *fb_info)
1852 {
1853         mutex_lock(&registration_lock);
1854         do_unregister_framebuffer(fb_info);
1855         mutex_unlock(&registration_lock);
1856 }
1857 EXPORT_SYMBOL(unregister_framebuffer);
1858
1859 /**
1860  *      fb_set_suspend - low level driver signals suspend
1861  *      @info: framebuffer affected
1862  *      @state: 0 = resuming, !=0 = suspending
1863  *
1864  *      This is meant to be used by low level drivers to
1865  *      signal suspend/resume to the core & clients.
1866  *      It must be called with the console semaphore held
1867  */
1868 void fb_set_suspend(struct fb_info *info, int state)
1869 {
1870         WARN_CONSOLE_UNLOCKED();
1871
1872         if (state) {
1873                 fbcon_suspended(info);
1874                 info->state = FBINFO_STATE_SUSPENDED;
1875         } else {
1876                 info->state = FBINFO_STATE_RUNNING;
1877                 fbcon_resumed(info);
1878         }
1879 }
1880 EXPORT_SYMBOL(fb_set_suspend);
1881
1882 /**
1883  *      fbmem_init - init frame buffer subsystem
1884  *
1885  *      Initialize the frame buffer subsystem.
1886  *
1887  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1888  *
1889  */
1890
1891 static int __init
1892 fbmem_init(void)
1893 {
1894         int ret;
1895
1896         if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops))
1897                 return -ENOMEM;
1898
1899         ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
1900         if (ret) {
1901                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1902                 goto err_chrdev;
1903         }
1904
1905         fb_class = class_create(THIS_MODULE, "graphics");
1906         if (IS_ERR(fb_class)) {
1907                 ret = PTR_ERR(fb_class);
1908                 pr_warn("Unable to create fb class; errno = %d\n", ret);
1909                 fb_class = NULL;
1910                 goto err_class;
1911         }
1912
1913         fb_console_init();
1914
1915         return 0;
1916
1917 err_class:
1918         unregister_chrdev(FB_MAJOR, "fb");
1919 err_chrdev:
1920         remove_proc_entry("fb", NULL);
1921         return ret;
1922 }
1923
1924 #ifdef MODULE
1925 module_init(fbmem_init);
1926 static void __exit
1927 fbmem_exit(void)
1928 {
1929         fb_console_exit();
1930
1931         remove_proc_entry("fb", NULL);
1932         class_destroy(fb_class);
1933         unregister_chrdev(FB_MAJOR, "fb");
1934 }
1935
1936 module_exit(fbmem_exit);
1937 MODULE_LICENSE("GPL");
1938 MODULE_DESCRIPTION("Framebuffer base");
1939 #else
1940 subsys_initcall(fbmem_init);
1941 #endif
1942
1943 int fb_new_modelist(struct fb_info *info)
1944 {
1945         struct fb_var_screeninfo var = info->var;
1946         struct list_head *pos, *n;
1947         struct fb_modelist *modelist;
1948         struct fb_videomode *m, mode;
1949         int err;
1950
1951         list_for_each_safe(pos, n, &info->modelist) {
1952                 modelist = list_entry(pos, struct fb_modelist, list);
1953                 m = &modelist->mode;
1954                 fb_videomode_to_var(&var, m);
1955                 var.activate = FB_ACTIVATE_TEST;
1956                 err = fb_set_var(info, &var);
1957                 fb_var_to_videomode(&mode, &var);
1958                 if (err || !fb_mode_is_equal(m, &mode)) {
1959                         list_del(pos);
1960                         kfree(pos);
1961                 }
1962         }
1963
1964         if (list_empty(&info->modelist))
1965                 return 1;
1966
1967         fbcon_new_modelist(info);
1968
1969         return 0;
1970 }
1971
1972 MODULE_LICENSE("GPL");