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(®istration_lock); 68 fb_info = registered_fb[idx]; 69 if (fb_info) 70 atomic_inc(&fb_info->count); 71 mutex_unlock(®istration_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(®istration_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(®istration_lock); 724 } 725 726 static int fb_seq_show(struct seq_file *m, void *v) 727 { 728 int i = *(loff_t *)v; 729 struct fb_info *fi = registered_fb[i]; 730 731 if (fi) 732 seq_printf(m, "%d %s\n", fi->node, fi->fix.id); 733 return 0; 734 } 735 736 static const struct seq_operations __maybe_unused proc_fb_seq_ops = { 737 .start = fb_seq_start, 738 .next = fb_seq_next, 739 .stop = fb_seq_stop, 740 .show = fb_seq_show, 741 }; 742 743 /* 744 * We hold a reference to the fb_info in file->private_data, 745 * but if the current registered fb has changed, we don't 746 * actually want to use it. 747 * 748 * So look up the fb_info using the inode minor number, 749 * and just verify it against the reference we have. 750 */ 751 static struct fb_info *file_fb_info(struct file *file) 752 { 753 struct inode *inode = file_inode(file); 754 int fbidx = iminor(inode); 755 struct fb_info *info = registered_fb[fbidx]; 756 757 if (info != file->private_data) 758 info = NULL; 759 return info; 760 } 761 762 static ssize_t 763 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) 764 { 765 unsigned long p = *ppos; 766 struct fb_info *info = file_fb_info(file); 767 u8 *buffer, *dst; 768 u8 __iomem *src; 769 int c, cnt = 0, err = 0; 770 unsigned long total_size; 771 772 if (!info || ! info->screen_base) 773 return -ENODEV; 774 775 if (info->state != FBINFO_STATE_RUNNING) 776 return -EPERM; 777 778 if (info->fbops->fb_read) 779 return info->fbops->fb_read(info, buf, count, ppos); 780 781 total_size = info->screen_size; 782 783 if (total_size == 0) 784 total_size = info->fix.smem_len; 785 786 if (p >= total_size) 787 return 0; 788 789 if (count >= total_size) 790 count = total_size; 791 792 if (count + p > total_size) 793 count = total_size - p; 794 795 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, 796 GFP_KERNEL); 797 if (!buffer) 798 return -ENOMEM; 799 800 src = (u8 __iomem *) (info->screen_base + p); 801 802 if (info->fbops->fb_sync) 803 info->fbops->fb_sync(info); 804 805 while (count) { 806 c = (count > PAGE_SIZE) ? PAGE_SIZE : count; 807 dst = buffer; 808 fb_memcpy_fromfb(dst, src, c); 809 dst += c; 810 src += c; 811 812 if (copy_to_user(buf, buffer, c)) { 813 err = -EFAULT; 814 break; 815 } 816 *ppos += c; 817 buf += c; 818 cnt += c; 819 count -= c; 820 } 821 822 kfree(buffer); 823 824 return (err) ? err : cnt; 825 } 826 827 static ssize_t 828 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) 829 { 830 unsigned long p = *ppos; 831 struct fb_info *info = file_fb_info(file); 832 u8 *buffer, *src; 833 u8 __iomem *dst; 834 int c, cnt = 0, err = 0; 835 unsigned long total_size; 836 837 if (!info || !info->screen_base) 838 return -ENODEV; 839 840 if (info->state != FBINFO_STATE_RUNNING) 841 return -EPERM; 842 843 if (info->fbops->fb_write) 844 return info->fbops->fb_write(info, buf, count, ppos); 845 846 total_size = info->screen_size; 847 848 if (total_size == 0) 849 total_size = info->fix.smem_len; 850 851 if (p > total_size) 852 return -EFBIG; 853 854 if (count > total_size) { 855 err = -EFBIG; 856 count = total_size; 857 } 858 859 if (count + p > total_size) { 860 if (!err) 861 err = -ENOSPC; 862 863 count = total_size - p; 864 } 865 866 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, 867 GFP_KERNEL); 868 if (!buffer) 869 return -ENOMEM; 870 871 dst = (u8 __iomem *) (info->screen_base + p); 872 873 if (info->fbops->fb_sync) 874 info->fbops->fb_sync(info); 875 876 while (count) { 877 c = (count > PAGE_SIZE) ? PAGE_SIZE : count; 878 src = buffer; 879 880 if (copy_from_user(src, buf, c)) { 881 err = -EFAULT; 882 break; 883 } 884 885 fb_memcpy_tofb(dst, src, c); 886 dst += c; 887 src += c; 888 *ppos += c; 889 buf += c; 890 cnt += c; 891 count -= c; 892 } 893 894 kfree(buffer); 895 896 return (cnt) ? cnt : err; 897 } 898 899 int 900 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var) 901 { 902 struct fb_fix_screeninfo *fix = &info->fix; 903 unsigned int yres = info->var.yres; 904 int err = 0; 905 906 if (var->yoffset > 0) { 907 if (var->vmode & FB_VMODE_YWRAP) { 908 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep)) 909 err = -EINVAL; 910 else 911 yres = 0; 912 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep)) 913 err = -EINVAL; 914 } 915 916 if (var->xoffset > 0 && (!fix->xpanstep || 917 (var->xoffset % fix->xpanstep))) 918 err = -EINVAL; 919 920 if (err || !info->fbops->fb_pan_display || 921 var->yoffset > info->var.yres_virtual - yres || 922 var->xoffset > info->var.xres_virtual - info->var.xres) 923 return -EINVAL; 924 925 if ((err = info->fbops->fb_pan_display(var, info))) 926 return err; 927 info->var.xoffset = var->xoffset; 928 info->var.yoffset = var->yoffset; 929 if (var->vmode & FB_VMODE_YWRAP) 930 info->var.vmode |= FB_VMODE_YWRAP; 931 else 932 info->var.vmode &= ~FB_VMODE_YWRAP; 933 return 0; 934 } 935 EXPORT_SYMBOL(fb_pan_display); 936 937 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var, 938 u32 activate) 939 { 940 struct fb_blit_caps caps, fbcaps; 941 int err = 0; 942 943 memset(&caps, 0, sizeof(caps)); 944 memset(&fbcaps, 0, sizeof(fbcaps)); 945 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0; 946 fbcon_get_requirement(info, &caps); 947 info->fbops->fb_get_caps(info, &fbcaps, var); 948 949 if (((fbcaps.x ^ caps.x) & caps.x) || 950 ((fbcaps.y ^ caps.y) & caps.y) || 951 (fbcaps.len < caps.len)) 952 err = -EINVAL; 953 954 return err; 955 } 956 957 int 958 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var) 959 { 960 int ret = 0; 961 u32 activate; 962 struct fb_var_screeninfo old_var; 963 struct fb_videomode mode; 964 struct fb_event event; 965 966 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 /* bitfill_aligned() assumes that it's at least 8x8 */ 1010 if (var->xres < 8 || var->yres < 8) 1011 return -EINVAL; 1012 1013 ret = info->fbops->fb_check_var(var, info); 1014 1015 if (ret) 1016 return ret; 1017 1018 if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW) 1019 return 0; 1020 1021 if (info->fbops->fb_get_caps) { 1022 ret = fb_check_caps(info, var, activate); 1023 1024 if (ret) 1025 return ret; 1026 } 1027 1028 old_var = info->var; 1029 info->var = *var; 1030 1031 if (info->fbops->fb_set_par) { 1032 ret = info->fbops->fb_set_par(info); 1033 1034 if (ret) { 1035 info->var = old_var; 1036 printk(KERN_WARNING "detected " 1037 "fb_set_par error, " 1038 "error code: %d\n", ret); 1039 return ret; 1040 } 1041 } 1042 1043 fb_pan_display(info, &info->var); 1044 fb_set_cmap(&info->cmap, info); 1045 fb_var_to_videomode(&mode, &info->var); 1046 1047 if (info->modelist.prev && info->modelist.next && 1048 !list_empty(&info->modelist)) 1049 ret = fb_add_videomode(&mode, &info->modelist); 1050 1051 if (ret) 1052 return ret; 1053 1054 event.info = info; 1055 event.data = &mode; 1056 fb_notifier_call_chain(FB_EVENT_MODE_CHANGE, &event); 1057 1058 return 0; 1059 } 1060 EXPORT_SYMBOL(fb_set_var); 1061 1062 int 1063 fb_blank(struct fb_info *info, int blank) 1064 { 1065 struct fb_event event; 1066 int ret = -EINVAL; 1067 1068 if (blank > FB_BLANK_POWERDOWN) 1069 blank = FB_BLANK_POWERDOWN; 1070 1071 event.info = info; 1072 event.data = ␣ 1073 1074 if (info->fbops->fb_blank) 1075 ret = info->fbops->fb_blank(blank, info); 1076 1077 if (!ret) 1078 fb_notifier_call_chain(FB_EVENT_BLANK, &event); 1079 1080 return ret; 1081 } 1082 EXPORT_SYMBOL(fb_blank); 1083 1084 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd, 1085 unsigned long arg) 1086 { 1087 const struct fb_ops *fb; 1088 struct fb_var_screeninfo var; 1089 struct fb_fix_screeninfo fix; 1090 struct fb_cmap cmap_from; 1091 struct fb_cmap_user cmap; 1092 void __user *argp = (void __user *)arg; 1093 long ret = 0; 1094 1095 switch (cmd) { 1096 case FBIOGET_VSCREENINFO: 1097 lock_fb_info(info); 1098 var = info->var; 1099 unlock_fb_info(info); 1100 1101 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0; 1102 break; 1103 case FBIOPUT_VSCREENINFO: 1104 if (copy_from_user(&var, argp, sizeof(var))) 1105 return -EFAULT; 1106 console_lock(); 1107 lock_fb_info(info); 1108 ret = fb_set_var(info, &var); 1109 if (!ret) 1110 fbcon_update_vcs(info, var.activate & FB_ACTIVATE_ALL); 1111 unlock_fb_info(info); 1112 console_unlock(); 1113 if (!ret && copy_to_user(argp, &var, sizeof(var))) 1114 ret = -EFAULT; 1115 break; 1116 case FBIOGET_FSCREENINFO: 1117 lock_fb_info(info); 1118 memcpy(&fix, &info->fix, sizeof(fix)); 1119 if (info->flags & FBINFO_HIDE_SMEM_START) 1120 fix.smem_start = 0; 1121 unlock_fb_info(info); 1122 1123 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0; 1124 break; 1125 case FBIOPUTCMAP: 1126 if (copy_from_user(&cmap, argp, sizeof(cmap))) 1127 return -EFAULT; 1128 ret = fb_set_user_cmap(&cmap, info); 1129 break; 1130 case FBIOGETCMAP: 1131 if (copy_from_user(&cmap, argp, sizeof(cmap))) 1132 return -EFAULT; 1133 lock_fb_info(info); 1134 cmap_from = info->cmap; 1135 unlock_fb_info(info); 1136 ret = fb_cmap_to_user(&cmap_from, &cmap); 1137 break; 1138 case FBIOPAN_DISPLAY: 1139 if (copy_from_user(&var, argp, sizeof(var))) 1140 return -EFAULT; 1141 console_lock(); 1142 lock_fb_info(info); 1143 ret = fb_pan_display(info, &var); 1144 unlock_fb_info(info); 1145 console_unlock(); 1146 if (ret == 0 && copy_to_user(argp, &var, sizeof(var))) 1147 return -EFAULT; 1148 break; 1149 case FBIO_CURSOR: 1150 ret = -EINVAL; 1151 break; 1152 case FBIOGET_CON2FBMAP: 1153 ret = fbcon_get_con2fb_map_ioctl(argp); 1154 break; 1155 case FBIOPUT_CON2FBMAP: 1156 ret = fbcon_set_con2fb_map_ioctl(argp); 1157 break; 1158 case FBIOBLANK: 1159 console_lock(); 1160 lock_fb_info(info); 1161 ret = fb_blank(info, arg); 1162 /* might again call into fb_blank */ 1163 fbcon_fb_blanked(info, arg); 1164 unlock_fb_info(info); 1165 console_unlock(); 1166 break; 1167 default: 1168 lock_fb_info(info); 1169 fb = info->fbops; 1170 if (fb->fb_ioctl) 1171 ret = fb->fb_ioctl(info, cmd, arg); 1172 else 1173 ret = -ENOTTY; 1174 unlock_fb_info(info); 1175 } 1176 return ret; 1177 } 1178 1179 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1180 { 1181 struct fb_info *info = file_fb_info(file); 1182 1183 if (!info) 1184 return -ENODEV; 1185 return do_fb_ioctl(info, cmd, arg); 1186 } 1187 1188 #ifdef CONFIG_COMPAT 1189 struct fb_fix_screeninfo32 { 1190 char id[16]; 1191 compat_caddr_t smem_start; 1192 u32 smem_len; 1193 u32 type; 1194 u32 type_aux; 1195 u32 visual; 1196 u16 xpanstep; 1197 u16 ypanstep; 1198 u16 ywrapstep; 1199 u32 line_length; 1200 compat_caddr_t mmio_start; 1201 u32 mmio_len; 1202 u32 accel; 1203 u16 reserved[3]; 1204 }; 1205 1206 struct fb_cmap32 { 1207 u32 start; 1208 u32 len; 1209 compat_caddr_t red; 1210 compat_caddr_t green; 1211 compat_caddr_t blue; 1212 compat_caddr_t transp; 1213 }; 1214 1215 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd, 1216 unsigned long arg) 1217 { 1218 struct fb_cmap32 cmap32; 1219 struct fb_cmap cmap_from; 1220 struct fb_cmap_user cmap; 1221 1222 if (copy_from_user(&cmap32, compat_ptr(arg), sizeof(cmap32))) 1223 return -EFAULT; 1224 1225 cmap = (struct fb_cmap_user) { 1226 .start = cmap32.start, 1227 .len = cmap32.len, 1228 .red = compat_ptr(cmap32.red), 1229 .green = compat_ptr(cmap32.green), 1230 .blue = compat_ptr(cmap32.blue), 1231 .transp = compat_ptr(cmap32.transp), 1232 }; 1233 1234 if (cmd == FBIOPUTCMAP) 1235 return fb_set_user_cmap(&cmap, info); 1236 1237 lock_fb_info(info); 1238 cmap_from = info->cmap; 1239 unlock_fb_info(info); 1240 1241 return fb_cmap_to_user(&cmap_from, &cmap); 1242 } 1243 1244 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix, 1245 struct fb_fix_screeninfo32 __user *fix32) 1246 { 1247 __u32 data; 1248 int err; 1249 1250 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id)); 1251 1252 data = (__u32) (unsigned long) fix->smem_start; 1253 err |= put_user(data, &fix32->smem_start); 1254 1255 err |= put_user(fix->smem_len, &fix32->smem_len); 1256 err |= put_user(fix->type, &fix32->type); 1257 err |= put_user(fix->type_aux, &fix32->type_aux); 1258 err |= put_user(fix->visual, &fix32->visual); 1259 err |= put_user(fix->xpanstep, &fix32->xpanstep); 1260 err |= put_user(fix->ypanstep, &fix32->ypanstep); 1261 err |= put_user(fix->ywrapstep, &fix32->ywrapstep); 1262 err |= put_user(fix->line_length, &fix32->line_length); 1263 1264 data = (__u32) (unsigned long) fix->mmio_start; 1265 err |= put_user(data, &fix32->mmio_start); 1266 1267 err |= put_user(fix->mmio_len, &fix32->mmio_len); 1268 err |= put_user(fix->accel, &fix32->accel); 1269 err |= copy_to_user(fix32->reserved, fix->reserved, 1270 sizeof(fix->reserved)); 1271 1272 if (err) 1273 return -EFAULT; 1274 return 0; 1275 } 1276 1277 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd, 1278 unsigned long arg) 1279 { 1280 struct fb_fix_screeninfo fix; 1281 1282 lock_fb_info(info); 1283 fix = info->fix; 1284 if (info->flags & FBINFO_HIDE_SMEM_START) 1285 fix.smem_start = 0; 1286 unlock_fb_info(info); 1287 return do_fscreeninfo_to_user(&fix, compat_ptr(arg)); 1288 } 1289 1290 static long fb_compat_ioctl(struct file *file, unsigned int cmd, 1291 unsigned long arg) 1292 { 1293 struct fb_info *info = file_fb_info(file); 1294 const struct fb_ops *fb; 1295 long ret = -ENOIOCTLCMD; 1296 1297 if (!info) 1298 return -ENODEV; 1299 fb = info->fbops; 1300 switch(cmd) { 1301 case FBIOGET_VSCREENINFO: 1302 case FBIOPUT_VSCREENINFO: 1303 case FBIOPAN_DISPLAY: 1304 case FBIOGET_CON2FBMAP: 1305 case FBIOPUT_CON2FBMAP: 1306 arg = (unsigned long) compat_ptr(arg); 1307 fallthrough; 1308 case FBIOBLANK: 1309 ret = do_fb_ioctl(info, cmd, arg); 1310 break; 1311 1312 case FBIOGET_FSCREENINFO: 1313 ret = fb_get_fscreeninfo(info, cmd, arg); 1314 break; 1315 1316 case FBIOGETCMAP: 1317 case FBIOPUTCMAP: 1318 ret = fb_getput_cmap(info, cmd, arg); 1319 break; 1320 1321 default: 1322 if (fb->fb_compat_ioctl) 1323 ret = fb->fb_compat_ioctl(info, cmd, arg); 1324 break; 1325 } 1326 return ret; 1327 } 1328 #endif 1329 1330 static int 1331 fb_mmap(struct file *file, struct vm_area_struct * vma) 1332 { 1333 struct fb_info *info = file_fb_info(file); 1334 int (*fb_mmap_fn)(struct fb_info *info, struct vm_area_struct *vma); 1335 unsigned long mmio_pgoff; 1336 unsigned long start; 1337 u32 len; 1338 1339 if (!info) 1340 return -ENODEV; 1341 mutex_lock(&info->mm_lock); 1342 1343 fb_mmap_fn = info->fbops->fb_mmap; 1344 1345 #if IS_ENABLED(CONFIG_FB_DEFERRED_IO) 1346 if (info->fbdefio) 1347 fb_mmap_fn = fb_deferred_io_mmap; 1348 #endif 1349 1350 if (fb_mmap_fn) { 1351 int res; 1352 1353 /* 1354 * The framebuffer needs to be accessed decrypted, be sure 1355 * SME protection is removed ahead of the call 1356 */ 1357 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); 1358 res = fb_mmap_fn(info, vma); 1359 mutex_unlock(&info->mm_lock); 1360 return res; 1361 } 1362 1363 /* 1364 * Ugh. This can be either the frame buffer mapping, or 1365 * if pgoff points past it, the mmio mapping. 1366 */ 1367 start = info->fix.smem_start; 1368 len = info->fix.smem_len; 1369 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT; 1370 if (vma->vm_pgoff >= mmio_pgoff) { 1371 if (info->var.accel_flags) { 1372 mutex_unlock(&info->mm_lock); 1373 return -EINVAL; 1374 } 1375 1376 vma->vm_pgoff -= mmio_pgoff; 1377 start = info->fix.mmio_start; 1378 len = info->fix.mmio_len; 1379 } 1380 mutex_unlock(&info->mm_lock); 1381 1382 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); 1383 fb_pgprotect(file, vma, start); 1384 1385 return vm_iomap_memory(vma, start, len); 1386 } 1387 1388 static int 1389 fb_open(struct inode *inode, struct file *file) 1390 __acquires(&info->lock) 1391 __releases(&info->lock) 1392 { 1393 int fbidx = iminor(inode); 1394 struct fb_info *info; 1395 int res = 0; 1396 1397 info = get_fb_info(fbidx); 1398 if (!info) { 1399 request_module("fb%d", fbidx); 1400 info = get_fb_info(fbidx); 1401 if (!info) 1402 return -ENODEV; 1403 } 1404 if (IS_ERR(info)) 1405 return PTR_ERR(info); 1406 1407 lock_fb_info(info); 1408 if (!try_module_get(info->fbops->owner)) { 1409 res = -ENODEV; 1410 goto out; 1411 } 1412 file->private_data = info; 1413 if (info->fbops->fb_open) { 1414 res = info->fbops->fb_open(info,1); 1415 if (res) 1416 module_put(info->fbops->owner); 1417 } 1418 out: 1419 unlock_fb_info(info); 1420 if (res) 1421 put_fb_info(info); 1422 return res; 1423 } 1424 1425 static int 1426 fb_release(struct inode *inode, struct file *file) 1427 __acquires(&info->lock) 1428 __releases(&info->lock) 1429 { 1430 struct fb_info * const info = file->private_data; 1431 1432 lock_fb_info(info); 1433 if (info->fbops->fb_release) 1434 info->fbops->fb_release(info,1); 1435 module_put(info->fbops->owner); 1436 unlock_fb_info(info); 1437 put_fb_info(info); 1438 return 0; 1439 } 1440 1441 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU) 1442 unsigned long get_fb_unmapped_area(struct file *filp, 1443 unsigned long addr, unsigned long len, 1444 unsigned long pgoff, unsigned long flags) 1445 { 1446 struct fb_info * const info = filp->private_data; 1447 unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len); 1448 1449 if (pgoff > fb_size || len > fb_size - pgoff) 1450 return -EINVAL; 1451 1452 return (unsigned long)info->screen_base + pgoff; 1453 } 1454 #endif 1455 1456 static const struct file_operations fb_fops = { 1457 .owner = THIS_MODULE, 1458 .read = fb_read, 1459 .write = fb_write, 1460 .unlocked_ioctl = fb_ioctl, 1461 #ifdef CONFIG_COMPAT 1462 .compat_ioctl = fb_compat_ioctl, 1463 #endif 1464 .mmap = fb_mmap, 1465 .open = fb_open, 1466 .release = fb_release, 1467 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \ 1468 (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \ 1469 !defined(CONFIG_MMU)) 1470 .get_unmapped_area = get_fb_unmapped_area, 1471 #endif 1472 #ifdef CONFIG_FB_DEFERRED_IO 1473 .fsync = fb_deferred_io_fsync, 1474 #endif 1475 .llseek = default_llseek, 1476 }; 1477 1478 struct class *fb_class; 1479 EXPORT_SYMBOL(fb_class); 1480 1481 static int fb_check_foreignness(struct fb_info *fi) 1482 { 1483 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN; 1484 1485 fi->flags &= ~FBINFO_FOREIGN_ENDIAN; 1486 1487 #ifdef __BIG_ENDIAN 1488 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH; 1489 #else 1490 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0; 1491 #endif /* __BIG_ENDIAN */ 1492 1493 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) { 1494 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to " 1495 "support this framebuffer\n", fi->fix.id); 1496 return -ENOSYS; 1497 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) { 1498 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to " 1499 "support this framebuffer\n", fi->fix.id); 1500 return -ENOSYS; 1501 } 1502 1503 return 0; 1504 } 1505 1506 static bool apertures_overlap(struct aperture *gen, struct aperture *hw) 1507 { 1508 /* is the generic aperture base the same as the HW one */ 1509 if (gen->base == hw->base) 1510 return true; 1511 /* is the generic aperture base inside the hw base->hw base+size */ 1512 if (gen->base > hw->base && gen->base < hw->base + hw->size) 1513 return true; 1514 return false; 1515 } 1516 1517 static bool fb_do_apertures_overlap(struct apertures_struct *gena, 1518 struct apertures_struct *hwa) 1519 { 1520 int i, j; 1521 if (!hwa || !gena) 1522 return false; 1523 1524 for (i = 0; i < hwa->count; ++i) { 1525 struct aperture *h = &hwa->ranges[i]; 1526 for (j = 0; j < gena->count; ++j) { 1527 struct aperture *g = &gena->ranges[j]; 1528 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n", 1529 (unsigned long long)g->base, 1530 (unsigned long long)g->size, 1531 (unsigned long long)h->base, 1532 (unsigned long long)h->size); 1533 if (apertures_overlap(g, h)) 1534 return true; 1535 } 1536 } 1537 1538 return false; 1539 } 1540 1541 static void do_unregister_framebuffer(struct fb_info *fb_info); 1542 1543 #define VGA_FB_PHYS 0xA0000 1544 static void do_remove_conflicting_framebuffers(struct apertures_struct *a, 1545 const char *name, bool primary) 1546 { 1547 int i; 1548 1549 /* check all firmware fbs and kick off if the base addr overlaps */ 1550 for_each_registered_fb(i) { 1551 struct apertures_struct *gen_aper; 1552 1553 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE)) 1554 continue; 1555 1556 gen_aper = registered_fb[i]->apertures; 1557 if (fb_do_apertures_overlap(gen_aper, a) || 1558 (primary && gen_aper && gen_aper->count && 1559 gen_aper->ranges[0].base == VGA_FB_PHYS)) { 1560 1561 printk(KERN_INFO "fb%d: switching to %s from %s\n", 1562 i, name, registered_fb[i]->fix.id); 1563 do_unregister_framebuffer(registered_fb[i]); 1564 } 1565 } 1566 } 1567 1568 static bool lockless_register_fb; 1569 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400); 1570 MODULE_PARM_DESC(lockless_register_fb, 1571 "Lockless framebuffer registration for debugging [default=off]"); 1572 1573 static int do_register_framebuffer(struct fb_info *fb_info) 1574 { 1575 int i, ret; 1576 struct fb_videomode mode; 1577 1578 if (fb_check_foreignness(fb_info)) 1579 return -ENOSYS; 1580 1581 do_remove_conflicting_framebuffers(fb_info->apertures, 1582 fb_info->fix.id, 1583 fb_is_primary_device(fb_info)); 1584 1585 if (num_registered_fb == FB_MAX) 1586 return -ENXIO; 1587 1588 num_registered_fb++; 1589 for (i = 0 ; i < FB_MAX; i++) 1590 if (!registered_fb[i]) 1591 break; 1592 fb_info->node = i; 1593 atomic_set(&fb_info->count, 1); 1594 mutex_init(&fb_info->lock); 1595 mutex_init(&fb_info->mm_lock); 1596 1597 fb_info->dev = device_create(fb_class, fb_info->device, 1598 MKDEV(FB_MAJOR, i), NULL, "fb%d", i); 1599 if (IS_ERR(fb_info->dev)) { 1600 /* Not fatal */ 1601 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev)); 1602 fb_info->dev = NULL; 1603 } else 1604 fb_init_device(fb_info); 1605 1606 if (fb_info->pixmap.addr == NULL) { 1607 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL); 1608 if (fb_info->pixmap.addr) { 1609 fb_info->pixmap.size = FBPIXMAPSIZE; 1610 fb_info->pixmap.buf_align = 1; 1611 fb_info->pixmap.scan_align = 1; 1612 fb_info->pixmap.access_align = 32; 1613 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT; 1614 } 1615 } 1616 fb_info->pixmap.offset = 0; 1617 1618 if (!fb_info->pixmap.blit_x) 1619 fb_info->pixmap.blit_x = ~(u32)0; 1620 1621 if (!fb_info->pixmap.blit_y) 1622 fb_info->pixmap.blit_y = ~(u32)0; 1623 1624 if (!fb_info->modelist.prev || !fb_info->modelist.next) 1625 INIT_LIST_HEAD(&fb_info->modelist); 1626 1627 if (fb_info->skip_vt_switch) 1628 pm_vt_switch_required(fb_info->dev, false); 1629 else 1630 pm_vt_switch_required(fb_info->dev, true); 1631 1632 fb_var_to_videomode(&mode, &fb_info->var); 1633 fb_add_videomode(&mode, &fb_info->modelist); 1634 registered_fb[i] = fb_info; 1635 1636 #ifdef CONFIG_GUMSTIX_AM200EPD 1637 { 1638 struct fb_event event; 1639 event.info = fb_info; 1640 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event); 1641 } 1642 #endif 1643 1644 if (!lockless_register_fb) 1645 console_lock(); 1646 else 1647 atomic_inc(&ignore_console_lock_warning); 1648 lock_fb_info(fb_info); 1649 ret = fbcon_fb_registered(fb_info); 1650 unlock_fb_info(fb_info); 1651 1652 if (!lockless_register_fb) 1653 console_unlock(); 1654 else 1655 atomic_dec(&ignore_console_lock_warning); 1656 return ret; 1657 } 1658 1659 static void unbind_console(struct fb_info *fb_info) 1660 { 1661 int i = fb_info->node; 1662 1663 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)) 1664 return; 1665 1666 console_lock(); 1667 lock_fb_info(fb_info); 1668 fbcon_fb_unbind(fb_info); 1669 unlock_fb_info(fb_info); 1670 console_unlock(); 1671 } 1672 1673 static void unlink_framebuffer(struct fb_info *fb_info) 1674 { 1675 int i; 1676 1677 i = fb_info->node; 1678 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)) 1679 return; 1680 1681 if (!fb_info->dev) 1682 return; 1683 1684 device_destroy(fb_class, MKDEV(FB_MAJOR, i)); 1685 1686 pm_vt_switch_unregister(fb_info->dev); 1687 1688 unbind_console(fb_info); 1689 1690 fb_info->dev = NULL; 1691 } 1692 1693 static void do_unregister_framebuffer(struct fb_info *fb_info) 1694 { 1695 unlink_framebuffer(fb_info); 1696 if (fb_info->pixmap.addr && 1697 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) 1698 kfree(fb_info->pixmap.addr); 1699 fb_destroy_modelist(&fb_info->modelist); 1700 registered_fb[fb_info->node] = NULL; 1701 num_registered_fb--; 1702 fb_cleanup_device(fb_info); 1703 #ifdef CONFIG_GUMSTIX_AM200EPD 1704 { 1705 struct fb_event event; 1706 event.info = fb_info; 1707 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event); 1708 } 1709 #endif 1710 console_lock(); 1711 fbcon_fb_unregistered(fb_info); 1712 console_unlock(); 1713 1714 /* this may free fb info */ 1715 put_fb_info(fb_info); 1716 } 1717 1718 /** 1719 * remove_conflicting_framebuffers - remove firmware-configured framebuffers 1720 * @a: memory range, users of which are to be removed 1721 * @name: requesting driver name 1722 * @primary: also kick vga16fb if present 1723 * 1724 * This function removes framebuffer devices (initialized by firmware/bootloader) 1725 * which use memory range described by @a. If @a is NULL all such devices are 1726 * removed. 1727 */ 1728 int remove_conflicting_framebuffers(struct apertures_struct *a, 1729 const char *name, bool primary) 1730 { 1731 bool do_free = false; 1732 1733 if (!a) { 1734 a = alloc_apertures(1); 1735 if (!a) 1736 return -ENOMEM; 1737 1738 a->ranges[0].base = 0; 1739 a->ranges[0].size = ~0; 1740 do_free = true; 1741 } 1742 1743 mutex_lock(®istration_lock); 1744 do_remove_conflicting_framebuffers(a, name, primary); 1745 mutex_unlock(®istration_lock); 1746 1747 if (do_free) 1748 kfree(a); 1749 1750 return 0; 1751 } 1752 EXPORT_SYMBOL(remove_conflicting_framebuffers); 1753 1754 /** 1755 * remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices 1756 * @pdev: PCI device 1757 * @name: requesting driver name 1758 * 1759 * This function removes framebuffer devices (eg. initialized by firmware) 1760 * using memory range configured for any of @pdev's memory bars. 1761 * 1762 * The function assumes that PCI device with shadowed ROM drives a primary 1763 * display and so kicks out vga16fb. 1764 */ 1765 int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, const char *name) 1766 { 1767 struct apertures_struct *ap; 1768 bool primary = false; 1769 int err, idx, bar; 1770 1771 for (idx = 0, bar = 0; bar < PCI_STD_NUM_BARS; bar++) { 1772 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) 1773 continue; 1774 idx++; 1775 } 1776 1777 ap = alloc_apertures(idx); 1778 if (!ap) 1779 return -ENOMEM; 1780 1781 for (idx = 0, bar = 0; bar < PCI_STD_NUM_BARS; bar++) { 1782 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) 1783 continue; 1784 ap->ranges[idx].base = pci_resource_start(pdev, bar); 1785 ap->ranges[idx].size = pci_resource_len(pdev, bar); 1786 pci_dbg(pdev, "%s: bar %d: 0x%lx -> 0x%lx\n", __func__, bar, 1787 (unsigned long)pci_resource_start(pdev, bar), 1788 (unsigned long)pci_resource_end(pdev, bar)); 1789 idx++; 1790 } 1791 1792 #ifdef CONFIG_X86 1793 primary = pdev->resource[PCI_ROM_RESOURCE].flags & 1794 IORESOURCE_ROM_SHADOW; 1795 #endif 1796 err = remove_conflicting_framebuffers(ap, name, primary); 1797 kfree(ap); 1798 return err; 1799 } 1800 EXPORT_SYMBOL(remove_conflicting_pci_framebuffers); 1801 1802 /** 1803 * register_framebuffer - registers a frame buffer device 1804 * @fb_info: frame buffer info structure 1805 * 1806 * Registers a frame buffer device @fb_info. 1807 * 1808 * Returns negative errno on error, or zero for success. 1809 * 1810 */ 1811 int 1812 register_framebuffer(struct fb_info *fb_info) 1813 { 1814 int ret; 1815 1816 mutex_lock(®istration_lock); 1817 ret = do_register_framebuffer(fb_info); 1818 mutex_unlock(®istration_lock); 1819 1820 return ret; 1821 } 1822 EXPORT_SYMBOL(register_framebuffer); 1823 1824 /** 1825 * unregister_framebuffer - releases a frame buffer device 1826 * @fb_info: frame buffer info structure 1827 * 1828 * Unregisters a frame buffer device @fb_info. 1829 * 1830 * Returns negative errno on error, or zero for success. 1831 * 1832 * This function will also notify the framebuffer console 1833 * to release the driver. 1834 * 1835 * This is meant to be called within a driver's module_exit() 1836 * function. If this is called outside module_exit(), ensure 1837 * that the driver implements fb_open() and fb_release() to 1838 * check that no processes are using the device. 1839 */ 1840 void 1841 unregister_framebuffer(struct fb_info *fb_info) 1842 { 1843 mutex_lock(®istration_lock); 1844 do_unregister_framebuffer(fb_info); 1845 mutex_unlock(®istration_lock); 1846 } 1847 EXPORT_SYMBOL(unregister_framebuffer); 1848 1849 /** 1850 * fb_set_suspend - low level driver signals suspend 1851 * @info: framebuffer affected 1852 * @state: 0 = resuming, !=0 = suspending 1853 * 1854 * This is meant to be used by low level drivers to 1855 * signal suspend/resume to the core & clients. 1856 * It must be called with the console semaphore held 1857 */ 1858 void fb_set_suspend(struct fb_info *info, int state) 1859 { 1860 WARN_CONSOLE_UNLOCKED(); 1861 1862 if (state) { 1863 fbcon_suspended(info); 1864 info->state = FBINFO_STATE_SUSPENDED; 1865 } else { 1866 info->state = FBINFO_STATE_RUNNING; 1867 fbcon_resumed(info); 1868 } 1869 } 1870 EXPORT_SYMBOL(fb_set_suspend); 1871 1872 /** 1873 * fbmem_init - init frame buffer subsystem 1874 * 1875 * Initialize the frame buffer subsystem. 1876 * 1877 * NOTE: This function is _only_ to be called by drivers/char/mem.c. 1878 * 1879 */ 1880 1881 static int __init 1882 fbmem_init(void) 1883 { 1884 int ret; 1885 1886 if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops)) 1887 return -ENOMEM; 1888 1889 ret = register_chrdev(FB_MAJOR, "fb", &fb_fops); 1890 if (ret) { 1891 printk("unable to get major %d for fb devs\n", FB_MAJOR); 1892 goto err_chrdev; 1893 } 1894 1895 fb_class = class_create(THIS_MODULE, "graphics"); 1896 if (IS_ERR(fb_class)) { 1897 ret = PTR_ERR(fb_class); 1898 pr_warn("Unable to create fb class; errno = %d\n", ret); 1899 fb_class = NULL; 1900 goto err_class; 1901 } 1902 1903 fb_console_init(); 1904 1905 return 0; 1906 1907 err_class: 1908 unregister_chrdev(FB_MAJOR, "fb"); 1909 err_chrdev: 1910 remove_proc_entry("fb", NULL); 1911 return ret; 1912 } 1913 1914 #ifdef MODULE 1915 module_init(fbmem_init); 1916 static void __exit 1917 fbmem_exit(void) 1918 { 1919 fb_console_exit(); 1920 1921 remove_proc_entry("fb", NULL); 1922 class_destroy(fb_class); 1923 unregister_chrdev(FB_MAJOR, "fb"); 1924 } 1925 1926 module_exit(fbmem_exit); 1927 MODULE_LICENSE("GPL"); 1928 MODULE_DESCRIPTION("Framebuffer base"); 1929 #else 1930 subsys_initcall(fbmem_init); 1931 #endif 1932 1933 int fb_new_modelist(struct fb_info *info) 1934 { 1935 struct fb_var_screeninfo var = info->var; 1936 struct list_head *pos, *n; 1937 struct fb_modelist *modelist; 1938 struct fb_videomode *m, mode; 1939 int err; 1940 1941 list_for_each_safe(pos, n, &info->modelist) { 1942 modelist = list_entry(pos, struct fb_modelist, list); 1943 m = &modelist->mode; 1944 fb_videomode_to_var(&var, m); 1945 var.activate = FB_ACTIVATE_TEST; 1946 err = fb_set_var(info, &var); 1947 fb_var_to_videomode(&mode, &var); 1948 if (err || !fb_mode_is_equal(m, &mode)) { 1949 list_del(pos); 1950 kfree(pos); 1951 } 1952 } 1953 1954 if (list_empty(&info->modelist)) 1955 return 1; 1956 1957 fbcon_new_modelist(info); 1958 1959 return 0; 1960 } 1961 1962 MODULE_LICENSE("GPL"); 1963