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(®istration_lock); 67 fb_info = registered_fb[idx]; 68 if (fb_info) 69 atomic_inc(&fb_info->count); 70 mutex_unlock(®istration_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(®istration_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(®istration_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 = ␣ 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 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 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 struct fb_ops *fb; 1336 unsigned long mmio_pgoff; 1337 unsigned long start; 1338 u32 len; 1339 1340 if (!info) 1341 return -ENODEV; 1342 fb = info->fbops; 1343 mutex_lock(&info->mm_lock); 1344 if (fb->fb_mmap) { 1345 int res; 1346 1347 /* 1348 * The framebuffer needs to be accessed decrypted, be sure 1349 * SME protection is removed ahead of the call 1350 */ 1351 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); 1352 res = fb->fb_mmap(info, vma); 1353 mutex_unlock(&info->mm_lock); 1354 return res; 1355 } 1356 1357 /* 1358 * Ugh. This can be either the frame buffer mapping, or 1359 * if pgoff points past it, the mmio mapping. 1360 */ 1361 start = info->fix.smem_start; 1362 len = info->fix.smem_len; 1363 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT; 1364 if (vma->vm_pgoff >= mmio_pgoff) { 1365 if (info->var.accel_flags) { 1366 mutex_unlock(&info->mm_lock); 1367 return -EINVAL; 1368 } 1369 1370 vma->vm_pgoff -= mmio_pgoff; 1371 start = info->fix.mmio_start; 1372 len = info->fix.mmio_len; 1373 } 1374 mutex_unlock(&info->mm_lock); 1375 1376 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); 1377 /* 1378 * The framebuffer needs to be accessed decrypted, be sure 1379 * SME protection is removed 1380 */ 1381 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); 1382 fb_pgprotect(file, vma, start); 1383 1384 return vm_iomap_memory(vma, start, len); 1385 } 1386 1387 static int 1388 fb_open(struct inode *inode, struct file *file) 1389 __acquires(&info->lock) 1390 __releases(&info->lock) 1391 { 1392 int fbidx = iminor(inode); 1393 struct fb_info *info; 1394 int res = 0; 1395 1396 info = get_fb_info(fbidx); 1397 if (!info) { 1398 request_module("fb%d", fbidx); 1399 info = get_fb_info(fbidx); 1400 if (!info) 1401 return -ENODEV; 1402 } 1403 if (IS_ERR(info)) 1404 return PTR_ERR(info); 1405 1406 lock_fb_info(info); 1407 if (!try_module_get(info->fbops->owner)) { 1408 res = -ENODEV; 1409 goto out; 1410 } 1411 file->private_data = info; 1412 if (info->fbops->fb_open) { 1413 res = info->fbops->fb_open(info,1); 1414 if (res) 1415 module_put(info->fbops->owner); 1416 } 1417 #ifdef CONFIG_FB_DEFERRED_IO 1418 if (info->fbdefio) 1419 fb_deferred_io_open(info, inode, file); 1420 #endif 1421 out: 1422 unlock_fb_info(info); 1423 if (res) 1424 put_fb_info(info); 1425 return res; 1426 } 1427 1428 static int 1429 fb_release(struct inode *inode, struct file *file) 1430 __acquires(&info->lock) 1431 __releases(&info->lock) 1432 { 1433 struct fb_info * const info = file->private_data; 1434 1435 lock_fb_info(info); 1436 if (info->fbops->fb_release) 1437 info->fbops->fb_release(info,1); 1438 module_put(info->fbops->owner); 1439 unlock_fb_info(info); 1440 put_fb_info(info); 1441 return 0; 1442 } 1443 1444 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU) 1445 unsigned long get_fb_unmapped_area(struct file *filp, 1446 unsigned long addr, unsigned long len, 1447 unsigned long pgoff, unsigned long flags) 1448 { 1449 struct fb_info * const info = filp->private_data; 1450 unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len); 1451 1452 if (pgoff > fb_size || len > fb_size - pgoff) 1453 return -EINVAL; 1454 1455 return (unsigned long)info->screen_base + pgoff; 1456 } 1457 #endif 1458 1459 static const struct file_operations fb_fops = { 1460 .owner = THIS_MODULE, 1461 .read = fb_read, 1462 .write = fb_write, 1463 .unlocked_ioctl = fb_ioctl, 1464 #ifdef CONFIG_COMPAT 1465 .compat_ioctl = fb_compat_ioctl, 1466 #endif 1467 .mmap = fb_mmap, 1468 .open = fb_open, 1469 .release = fb_release, 1470 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \ 1471 (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \ 1472 !defined(CONFIG_MMU)) 1473 .get_unmapped_area = get_fb_unmapped_area, 1474 #endif 1475 #ifdef CONFIG_FB_DEFERRED_IO 1476 .fsync = fb_deferred_io_fsync, 1477 #endif 1478 .llseek = default_llseek, 1479 }; 1480 1481 struct class *fb_class; 1482 EXPORT_SYMBOL(fb_class); 1483 1484 static int fb_check_foreignness(struct fb_info *fi) 1485 { 1486 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN; 1487 1488 fi->flags &= ~FBINFO_FOREIGN_ENDIAN; 1489 1490 #ifdef __BIG_ENDIAN 1491 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH; 1492 #else 1493 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0; 1494 #endif /* __BIG_ENDIAN */ 1495 1496 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) { 1497 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to " 1498 "support this framebuffer\n", fi->fix.id); 1499 return -ENOSYS; 1500 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) { 1501 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to " 1502 "support this framebuffer\n", fi->fix.id); 1503 return -ENOSYS; 1504 } 1505 1506 return 0; 1507 } 1508 1509 static bool apertures_overlap(struct aperture *gen, struct aperture *hw) 1510 { 1511 /* is the generic aperture base the same as the HW one */ 1512 if (gen->base == hw->base) 1513 return true; 1514 /* is the generic aperture base inside the hw base->hw base+size */ 1515 if (gen->base > hw->base && gen->base < hw->base + hw->size) 1516 return true; 1517 return false; 1518 } 1519 1520 static bool fb_do_apertures_overlap(struct apertures_struct *gena, 1521 struct apertures_struct *hwa) 1522 { 1523 int i, j; 1524 if (!hwa || !gena) 1525 return false; 1526 1527 for (i = 0; i < hwa->count; ++i) { 1528 struct aperture *h = &hwa->ranges[i]; 1529 for (j = 0; j < gena->count; ++j) { 1530 struct aperture *g = &gena->ranges[j]; 1531 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n", 1532 (unsigned long long)g->base, 1533 (unsigned long long)g->size, 1534 (unsigned long long)h->base, 1535 (unsigned long long)h->size); 1536 if (apertures_overlap(g, h)) 1537 return true; 1538 } 1539 } 1540 1541 return false; 1542 } 1543 1544 static void do_unregister_framebuffer(struct fb_info *fb_info); 1545 1546 #define VGA_FB_PHYS 0xA0000 1547 static void do_remove_conflicting_framebuffers(struct apertures_struct *a, 1548 const char *name, bool primary) 1549 { 1550 int i; 1551 1552 /* check all firmware fbs and kick off if the base addr overlaps */ 1553 for_each_registered_fb(i) { 1554 struct apertures_struct *gen_aper; 1555 1556 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE)) 1557 continue; 1558 1559 gen_aper = registered_fb[i]->apertures; 1560 if (fb_do_apertures_overlap(gen_aper, a) || 1561 (primary && gen_aper && gen_aper->count && 1562 gen_aper->ranges[0].base == VGA_FB_PHYS)) { 1563 1564 printk(KERN_INFO "fb%d: switching to %s from %s\n", 1565 i, name, registered_fb[i]->fix.id); 1566 do_unregister_framebuffer(registered_fb[i]); 1567 } 1568 } 1569 } 1570 1571 static bool lockless_register_fb; 1572 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400); 1573 MODULE_PARM_DESC(lockless_register_fb, 1574 "Lockless framebuffer registration for debugging [default=off]"); 1575 1576 static int do_register_framebuffer(struct fb_info *fb_info) 1577 { 1578 int i, ret; 1579 struct fb_videomode mode; 1580 1581 if (fb_check_foreignness(fb_info)) 1582 return -ENOSYS; 1583 1584 do_remove_conflicting_framebuffers(fb_info->apertures, 1585 fb_info->fix.id, 1586 fb_is_primary_device(fb_info)); 1587 1588 if (num_registered_fb == FB_MAX) 1589 return -ENXIO; 1590 1591 num_registered_fb++; 1592 for (i = 0 ; i < FB_MAX; i++) 1593 if (!registered_fb[i]) 1594 break; 1595 fb_info->node = i; 1596 atomic_set(&fb_info->count, 1); 1597 mutex_init(&fb_info->lock); 1598 mutex_init(&fb_info->mm_lock); 1599 1600 fb_info->dev = device_create(fb_class, fb_info->device, 1601 MKDEV(FB_MAJOR, i), NULL, "fb%d", i); 1602 if (IS_ERR(fb_info->dev)) { 1603 /* Not fatal */ 1604 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev)); 1605 fb_info->dev = NULL; 1606 } else 1607 fb_init_device(fb_info); 1608 1609 if (fb_info->pixmap.addr == NULL) { 1610 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL); 1611 if (fb_info->pixmap.addr) { 1612 fb_info->pixmap.size = FBPIXMAPSIZE; 1613 fb_info->pixmap.buf_align = 1; 1614 fb_info->pixmap.scan_align = 1; 1615 fb_info->pixmap.access_align = 32; 1616 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT; 1617 } 1618 } 1619 fb_info->pixmap.offset = 0; 1620 1621 if (!fb_info->pixmap.blit_x) 1622 fb_info->pixmap.blit_x = ~(u32)0; 1623 1624 if (!fb_info->pixmap.blit_y) 1625 fb_info->pixmap.blit_y = ~(u32)0; 1626 1627 if (!fb_info->modelist.prev || !fb_info->modelist.next) 1628 INIT_LIST_HEAD(&fb_info->modelist); 1629 1630 if (fb_info->skip_vt_switch) 1631 pm_vt_switch_required(fb_info->dev, false); 1632 else 1633 pm_vt_switch_required(fb_info->dev, true); 1634 1635 fb_var_to_videomode(&mode, &fb_info->var); 1636 fb_add_videomode(&mode, &fb_info->modelist); 1637 registered_fb[i] = fb_info; 1638 1639 #ifdef CONFIG_GUMSTIX_AM200EPD 1640 { 1641 struct fb_event event; 1642 event.info = fb_info; 1643 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event); 1644 } 1645 #endif 1646 1647 if (!lockless_register_fb) 1648 console_lock(); 1649 else 1650 atomic_inc(&ignore_console_lock_warning); 1651 lock_fb_info(fb_info); 1652 ret = fbcon_fb_registered(fb_info); 1653 unlock_fb_info(fb_info); 1654 1655 if (!lockless_register_fb) 1656 console_unlock(); 1657 else 1658 atomic_dec(&ignore_console_lock_warning); 1659 return ret; 1660 } 1661 1662 static void unbind_console(struct fb_info *fb_info) 1663 { 1664 int i = fb_info->node; 1665 1666 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)) 1667 return; 1668 1669 console_lock(); 1670 lock_fb_info(fb_info); 1671 fbcon_fb_unbind(fb_info); 1672 unlock_fb_info(fb_info); 1673 console_unlock(); 1674 } 1675 1676 void unlink_framebuffer(struct fb_info *fb_info) 1677 { 1678 int i; 1679 1680 i = fb_info->node; 1681 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)) 1682 return; 1683 1684 if (!fb_info->dev) 1685 return; 1686 1687 device_destroy(fb_class, MKDEV(FB_MAJOR, i)); 1688 1689 pm_vt_switch_unregister(fb_info->dev); 1690 1691 unbind_console(fb_info); 1692 1693 fb_info->dev = NULL; 1694 } 1695 EXPORT_SYMBOL(unlink_framebuffer); 1696 1697 static void do_unregister_framebuffer(struct fb_info *fb_info) 1698 { 1699 unlink_framebuffer(fb_info); 1700 if (fb_info->pixmap.addr && 1701 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) 1702 kfree(fb_info->pixmap.addr); 1703 fb_destroy_modelist(&fb_info->modelist); 1704 registered_fb[fb_info->node] = NULL; 1705 num_registered_fb--; 1706 fb_cleanup_device(fb_info); 1707 #ifdef CONFIG_GUMSTIX_AM200EPD 1708 { 1709 struct fb_event event; 1710 event.info = fb_info; 1711 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event); 1712 } 1713 #endif 1714 console_lock(); 1715 fbcon_fb_unregistered(fb_info); 1716 console_unlock(); 1717 1718 /* this may free fb info */ 1719 put_fb_info(fb_info); 1720 } 1721 1722 /** 1723 * remove_conflicting_framebuffers - remove firmware-configured framebuffers 1724 * @a: memory range, users of which are to be removed 1725 * @name: requesting driver name 1726 * @primary: also kick vga16fb if present 1727 * 1728 * This function removes framebuffer devices (initialized by firmware/bootloader) 1729 * which use memory range described by @a. If @a is NULL all such devices are 1730 * removed. 1731 */ 1732 int remove_conflicting_framebuffers(struct apertures_struct *a, 1733 const char *name, bool primary) 1734 { 1735 bool do_free = false; 1736 1737 if (!a) { 1738 a = alloc_apertures(1); 1739 if (!a) 1740 return -ENOMEM; 1741 1742 a->ranges[0].base = 0; 1743 a->ranges[0].size = ~0; 1744 do_free = true; 1745 } 1746 1747 mutex_lock(®istration_lock); 1748 do_remove_conflicting_framebuffers(a, name, primary); 1749 mutex_unlock(®istration_lock); 1750 1751 if (do_free) 1752 kfree(a); 1753 1754 return 0; 1755 } 1756 EXPORT_SYMBOL(remove_conflicting_framebuffers); 1757 1758 /** 1759 * remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices 1760 * @pdev: PCI device 1761 * @name: requesting driver name 1762 * 1763 * This function removes framebuffer devices (eg. initialized by firmware) 1764 * using memory range configured for any of @pdev's memory bars. 1765 * 1766 * The function assumes that PCI device with shadowed ROM drives a primary 1767 * display and so kicks out vga16fb. 1768 */ 1769 int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, const char *name) 1770 { 1771 struct apertures_struct *ap; 1772 bool primary = false; 1773 int err, idx, bar; 1774 1775 for (idx = 0, bar = 0; bar < PCI_STD_NUM_BARS; bar++) { 1776 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) 1777 continue; 1778 idx++; 1779 } 1780 1781 ap = alloc_apertures(idx); 1782 if (!ap) 1783 return -ENOMEM; 1784 1785 for (idx = 0, bar = 0; bar < PCI_STD_NUM_BARS; bar++) { 1786 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) 1787 continue; 1788 ap->ranges[idx].base = pci_resource_start(pdev, bar); 1789 ap->ranges[idx].size = pci_resource_len(pdev, bar); 1790 pci_dbg(pdev, "%s: bar %d: 0x%lx -> 0x%lx\n", __func__, bar, 1791 (unsigned long)pci_resource_start(pdev, bar), 1792 (unsigned long)pci_resource_end(pdev, bar)); 1793 idx++; 1794 } 1795 1796 #ifdef CONFIG_X86 1797 primary = pdev->resource[PCI_ROM_RESOURCE].flags & 1798 IORESOURCE_ROM_SHADOW; 1799 #endif 1800 err = remove_conflicting_framebuffers(ap, name, primary); 1801 kfree(ap); 1802 return err; 1803 } 1804 EXPORT_SYMBOL(remove_conflicting_pci_framebuffers); 1805 1806 /** 1807 * register_framebuffer - registers a frame buffer device 1808 * @fb_info: frame buffer info structure 1809 * 1810 * Registers a frame buffer device @fb_info. 1811 * 1812 * Returns negative errno on error, or zero for success. 1813 * 1814 */ 1815 int 1816 register_framebuffer(struct fb_info *fb_info) 1817 { 1818 int ret; 1819 1820 mutex_lock(®istration_lock); 1821 ret = do_register_framebuffer(fb_info); 1822 mutex_unlock(®istration_lock); 1823 1824 return ret; 1825 } 1826 EXPORT_SYMBOL(register_framebuffer); 1827 1828 /** 1829 * unregister_framebuffer - releases a frame buffer device 1830 * @fb_info: frame buffer info structure 1831 * 1832 * Unregisters a frame buffer device @fb_info. 1833 * 1834 * Returns negative errno on error, or zero for success. 1835 * 1836 * This function will also notify the framebuffer console 1837 * to release the driver. 1838 * 1839 * This is meant to be called within a driver's module_exit() 1840 * function. If this is called outside module_exit(), ensure 1841 * that the driver implements fb_open() and fb_release() to 1842 * check that no processes are using the device. 1843 */ 1844 void 1845 unregister_framebuffer(struct fb_info *fb_info) 1846 { 1847 mutex_lock(®istration_lock); 1848 do_unregister_framebuffer(fb_info); 1849 mutex_unlock(®istration_lock); 1850 } 1851 EXPORT_SYMBOL(unregister_framebuffer); 1852 1853 /** 1854 * fb_set_suspend - low level driver signals suspend 1855 * @info: framebuffer affected 1856 * @state: 0 = resuming, !=0 = suspending 1857 * 1858 * This is meant to be used by low level drivers to 1859 * signal suspend/resume to the core & clients. 1860 * It must be called with the console semaphore held 1861 */ 1862 void fb_set_suspend(struct fb_info *info, int state) 1863 { 1864 WARN_CONSOLE_UNLOCKED(); 1865 1866 if (state) { 1867 fbcon_suspended(info); 1868 info->state = FBINFO_STATE_SUSPENDED; 1869 } else { 1870 info->state = FBINFO_STATE_RUNNING; 1871 fbcon_resumed(info); 1872 } 1873 } 1874 EXPORT_SYMBOL(fb_set_suspend); 1875 1876 /** 1877 * fbmem_init - init frame buffer subsystem 1878 * 1879 * Initialize the frame buffer subsystem. 1880 * 1881 * NOTE: This function is _only_ to be called by drivers/char/mem.c. 1882 * 1883 */ 1884 1885 static int __init 1886 fbmem_init(void) 1887 { 1888 int ret; 1889 1890 if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops)) 1891 return -ENOMEM; 1892 1893 ret = register_chrdev(FB_MAJOR, "fb", &fb_fops); 1894 if (ret) { 1895 printk("unable to get major %d for fb devs\n", FB_MAJOR); 1896 goto err_chrdev; 1897 } 1898 1899 fb_class = class_create(THIS_MODULE, "graphics"); 1900 if (IS_ERR(fb_class)) { 1901 ret = PTR_ERR(fb_class); 1902 pr_warn("Unable to create fb class; errno = %d\n", ret); 1903 fb_class = NULL; 1904 goto err_class; 1905 } 1906 1907 fb_console_init(); 1908 1909 return 0; 1910 1911 err_class: 1912 unregister_chrdev(FB_MAJOR, "fb"); 1913 err_chrdev: 1914 remove_proc_entry("fb", NULL); 1915 return ret; 1916 } 1917 1918 #ifdef MODULE 1919 module_init(fbmem_init); 1920 static void __exit 1921 fbmem_exit(void) 1922 { 1923 fb_console_exit(); 1924 1925 remove_proc_entry("fb", NULL); 1926 class_destroy(fb_class); 1927 unregister_chrdev(FB_MAJOR, "fb"); 1928 } 1929 1930 module_exit(fbmem_exit); 1931 MODULE_LICENSE("GPL"); 1932 MODULE_DESCRIPTION("Framebuffer base"); 1933 #else 1934 subsys_initcall(fbmem_init); 1935 #endif 1936 1937 int fb_new_modelist(struct fb_info *info) 1938 { 1939 struct fb_var_screeninfo var = info->var; 1940 struct list_head *pos, *n; 1941 struct fb_modelist *modelist; 1942 struct fb_videomode *m, mode; 1943 int err; 1944 1945 list_for_each_safe(pos, n, &info->modelist) { 1946 modelist = list_entry(pos, struct fb_modelist, list); 1947 m = &modelist->mode; 1948 fb_videomode_to_var(&var, m); 1949 var.activate = FB_ACTIVATE_TEST; 1950 err = fb_set_var(info, &var); 1951 fb_var_to_videomode(&mode, &var); 1952 if (err || !fb_mode_is_equal(m, &mode)) { 1953 list_del(pos); 1954 kfree(pos); 1955 } 1956 } 1957 1958 if (list_empty(&info->modelist)) 1959 return 1; 1960 1961 fbcon_new_modelist(info); 1962 1963 return 0; 1964 } 1965 1966 MODULE_LICENSE("GPL"); 1967