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/platform_device.h> 29 #include <linux/seq_file.h> 30 #include <linux/console.h> 31 #include <linux/kmod.h> 32 #include <linux/err.h> 33 #include <linux/device.h> 34 #include <linux/efi.h> 35 #include <linux/fb.h> 36 #include <linux/fbcon.h> 37 #include <linux/mem_encrypt.h> 38 #include <linux/pci.h> 39 40 #include <asm/fb.h> 41 42 43 /* 44 * Frame buffer device initialization and setup routines 45 */ 46 47 #define FBPIXMAPSIZE (1024 * 8) 48 49 static DEFINE_MUTEX(registration_lock); 50 51 struct fb_info *registered_fb[FB_MAX] __read_mostly; 52 EXPORT_SYMBOL(registered_fb); 53 54 int num_registered_fb __read_mostly; 55 EXPORT_SYMBOL(num_registered_fb); 56 57 bool fb_center_logo __read_mostly; 58 59 int fb_logo_count __read_mostly = -1; 60 61 static struct fb_info *get_fb_info(unsigned int idx) 62 { 63 struct fb_info *fb_info; 64 65 if (idx >= FB_MAX) 66 return ERR_PTR(-ENODEV); 67 68 mutex_lock(®istration_lock); 69 fb_info = registered_fb[idx]; 70 if (fb_info) 71 refcount_inc(&fb_info->count); 72 mutex_unlock(®istration_lock); 73 74 return fb_info; 75 } 76 77 static void put_fb_info(struct fb_info *fb_info) 78 { 79 if (!refcount_dec_and_test(&fb_info->count)) 80 return; 81 if (fb_info->fbops->fb_destroy) 82 fb_info->fbops->fb_destroy(fb_info); 83 } 84 85 /* 86 * Helpers 87 */ 88 89 int fb_get_color_depth(struct fb_var_screeninfo *var, 90 struct fb_fix_screeninfo *fix) 91 { 92 int depth = 0; 93 94 if (fix->visual == FB_VISUAL_MONO01 || 95 fix->visual == FB_VISUAL_MONO10) 96 depth = 1; 97 else { 98 if (var->green.length == var->blue.length && 99 var->green.length == var->red.length && 100 var->green.offset == var->blue.offset && 101 var->green.offset == var->red.offset) 102 depth = var->green.length; 103 else 104 depth = var->green.length + var->red.length + 105 var->blue.length; 106 } 107 108 return depth; 109 } 110 EXPORT_SYMBOL(fb_get_color_depth); 111 112 /* 113 * Data padding functions. 114 */ 115 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height) 116 { 117 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height); 118 } 119 EXPORT_SYMBOL(fb_pad_aligned_buffer); 120 121 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height, 122 u32 shift_high, u32 shift_low, u32 mod) 123 { 124 u8 mask = (u8) (0xfff << shift_high), tmp; 125 int i, j; 126 127 for (i = height; i--; ) { 128 for (j = 0; j < idx; j++) { 129 tmp = dst[j]; 130 tmp &= mask; 131 tmp |= *src >> shift_low; 132 dst[j] = tmp; 133 tmp = *src << shift_high; 134 dst[j+1] = tmp; 135 src++; 136 } 137 tmp = dst[idx]; 138 tmp &= mask; 139 tmp |= *src >> shift_low; 140 dst[idx] = tmp; 141 if (shift_high < mod) { 142 tmp = *src << shift_high; 143 dst[idx+1] = tmp; 144 } 145 src++; 146 dst += d_pitch; 147 } 148 } 149 EXPORT_SYMBOL(fb_pad_unaligned_buffer); 150 151 /* 152 * we need to lock this section since fb_cursor 153 * may use fb_imageblit() 154 */ 155 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size) 156 { 157 u32 align = buf->buf_align - 1, offset; 158 char *addr = buf->addr; 159 160 /* If IO mapped, we need to sync before access, no sharing of 161 * the pixmap is done 162 */ 163 if (buf->flags & FB_PIXMAP_IO) { 164 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) 165 info->fbops->fb_sync(info); 166 return addr; 167 } 168 169 /* See if we fit in the remaining pixmap space */ 170 offset = buf->offset + align; 171 offset &= ~align; 172 if (offset + size > buf->size) { 173 /* We do not fit. In order to be able to re-use the buffer, 174 * we must ensure no asynchronous DMA'ing or whatever operation 175 * is in progress, we sync for that. 176 */ 177 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) 178 info->fbops->fb_sync(info); 179 offset = 0; 180 } 181 buf->offset = offset + size; 182 addr += offset; 183 184 return addr; 185 } 186 EXPORT_SYMBOL(fb_get_buffer_offset); 187 188 #ifdef CONFIG_LOGO 189 190 static inline unsigned safe_shift(unsigned d, int n) 191 { 192 return n < 0 ? d >> -n : d << n; 193 } 194 195 static void fb_set_logocmap(struct fb_info *info, 196 const struct linux_logo *logo) 197 { 198 struct fb_cmap palette_cmap; 199 u16 palette_green[16]; 200 u16 palette_blue[16]; 201 u16 palette_red[16]; 202 int i, j, n; 203 const unsigned char *clut = logo->clut; 204 205 palette_cmap.start = 0; 206 palette_cmap.len = 16; 207 palette_cmap.red = palette_red; 208 palette_cmap.green = palette_green; 209 palette_cmap.blue = palette_blue; 210 palette_cmap.transp = NULL; 211 212 for (i = 0; i < logo->clutsize; i += n) { 213 n = logo->clutsize - i; 214 /* palette_cmap provides space for only 16 colors at once */ 215 if (n > 16) 216 n = 16; 217 palette_cmap.start = 32 + i; 218 palette_cmap.len = n; 219 for (j = 0; j < n; ++j) { 220 palette_cmap.red[j] = clut[0] << 8 | clut[0]; 221 palette_cmap.green[j] = clut[1] << 8 | clut[1]; 222 palette_cmap.blue[j] = clut[2] << 8 | clut[2]; 223 clut += 3; 224 } 225 fb_set_cmap(&palette_cmap, info); 226 } 227 } 228 229 static void fb_set_logo_truepalette(struct fb_info *info, 230 const struct linux_logo *logo, 231 u32 *palette) 232 { 233 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff }; 234 unsigned char redmask, greenmask, bluemask; 235 int redshift, greenshift, blueshift; 236 int i; 237 const unsigned char *clut = logo->clut; 238 239 /* 240 * We have to create a temporary palette since console palette is only 241 * 16 colors long. 242 */ 243 /* Bug: Doesn't obey msb_right ... (who needs that?) */ 244 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8]; 245 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8]; 246 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8]; 247 redshift = info->var.red.offset - (8 - info->var.red.length); 248 greenshift = info->var.green.offset - (8 - info->var.green.length); 249 blueshift = info->var.blue.offset - (8 - info->var.blue.length); 250 251 for ( i = 0; i < logo->clutsize; i++) { 252 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) | 253 safe_shift((clut[1] & greenmask), greenshift) | 254 safe_shift((clut[2] & bluemask), blueshift)); 255 clut += 3; 256 } 257 } 258 259 static void fb_set_logo_directpalette(struct fb_info *info, 260 const struct linux_logo *logo, 261 u32 *palette) 262 { 263 int redshift, greenshift, blueshift; 264 int i; 265 266 redshift = info->var.red.offset; 267 greenshift = info->var.green.offset; 268 blueshift = info->var.blue.offset; 269 270 for (i = 32; i < 32 + logo->clutsize; i++) 271 palette[i] = i << redshift | i << greenshift | i << blueshift; 272 } 273 274 static void fb_set_logo(struct fb_info *info, 275 const struct linux_logo *logo, u8 *dst, 276 int depth) 277 { 278 int i, j, k; 279 const u8 *src = logo->data; 280 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0; 281 u8 fg = 1, d; 282 283 switch (fb_get_color_depth(&info->var, &info->fix)) { 284 case 1: 285 fg = 1; 286 break; 287 case 2: 288 fg = 3; 289 break; 290 default: 291 fg = 7; 292 break; 293 } 294 295 if (info->fix.visual == FB_VISUAL_MONO01 || 296 info->fix.visual == FB_VISUAL_MONO10) 297 fg = ~((u8) (0xfff << info->var.green.length)); 298 299 switch (depth) { 300 case 4: 301 for (i = 0; i < logo->height; i++) 302 for (j = 0; j < logo->width; src++) { 303 *dst++ = *src >> 4; 304 j++; 305 if (j < logo->width) { 306 *dst++ = *src & 0x0f; 307 j++; 308 } 309 } 310 break; 311 case 1: 312 for (i = 0; i < logo->height; i++) { 313 for (j = 0; j < logo->width; src++) { 314 d = *src ^ xor; 315 for (k = 7; k >= 0 && j < logo->width; k--) { 316 *dst++ = ((d >> k) & 1) ? fg : 0; 317 j++; 318 } 319 } 320 } 321 break; 322 } 323 } 324 325 /* 326 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors), 327 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on 328 * the visual format and color depth of the framebuffer, the DAC, the 329 * pseudo_palette, and the logo data will be adjusted accordingly. 330 * 331 * Case 1 - linux_logo_clut224: 332 * Color exceeds the number of console colors (16), thus we set the hardware DAC 333 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set. 334 * 335 * For visuals that require color info from the pseudo_palette, we also construct 336 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags 337 * will be set. 338 * 339 * Case 2 - linux_logo_vga16: 340 * The number of colors just matches the console colors, thus there is no need 341 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie, 342 * each byte contains color information for two pixels (upper and lower nibble). 343 * To be consistent with fb_imageblit() usage, we therefore separate the two 344 * nibbles into separate bytes. The "depth" flag will be set to 4. 345 * 346 * Case 3 - linux_logo_mono: 347 * This is similar with Case 2. Each byte contains information for 8 pixels. 348 * We isolate each bit and expand each into a byte. The "depth" flag will 349 * be set to 1. 350 */ 351 static struct logo_data { 352 int depth; 353 int needs_directpalette; 354 int needs_truepalette; 355 int needs_cmapreset; 356 const struct linux_logo *logo; 357 } fb_logo __read_mostly; 358 359 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height) 360 { 361 u32 size = width * height, i; 362 363 out += size - 1; 364 365 for (i = size; i--; ) 366 *out-- = *in++; 367 } 368 369 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height) 370 { 371 int i, j, h = height - 1; 372 373 for (i = 0; i < height; i++) 374 for (j = 0; j < width; j++) 375 out[height * j + h - i] = *in++; 376 } 377 378 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height) 379 { 380 int i, j, w = width - 1; 381 382 for (i = 0; i < height; i++) 383 for (j = 0; j < width; j++) 384 out[height * (w - j) + i] = *in++; 385 } 386 387 static void fb_rotate_logo(struct fb_info *info, u8 *dst, 388 struct fb_image *image, int rotate) 389 { 390 u32 tmp; 391 392 if (rotate == FB_ROTATE_UD) { 393 fb_rotate_logo_ud(image->data, dst, image->width, 394 image->height); 395 image->dx = info->var.xres - image->width - image->dx; 396 image->dy = info->var.yres - image->height - image->dy; 397 } else if (rotate == FB_ROTATE_CW) { 398 fb_rotate_logo_cw(image->data, dst, image->width, 399 image->height); 400 swap(image->width, image->height); 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 swap(image->width, image->height); 408 tmp = image->dx; 409 image->dx = image->dy; 410 image->dy = info->var.yres - image->height - tmp; 411 } 412 413 image->data = dst; 414 } 415 416 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image, 417 int rotate, unsigned int num) 418 { 419 unsigned int x; 420 421 if (image->width > info->var.xres || image->height > info->var.yres) 422 return; 423 424 if (rotate == FB_ROTATE_UR) { 425 for (x = 0; 426 x < num && image->dx + image->width <= info->var.xres; 427 x++) { 428 info->fbops->fb_imageblit(info, image); 429 image->dx += image->width + 8; 430 } 431 } else if (rotate == FB_ROTATE_UD) { 432 u32 dx = image->dx; 433 434 for (x = 0; x < num && image->dx <= dx; x++) { 435 info->fbops->fb_imageblit(info, image); 436 image->dx -= image->width + 8; 437 } 438 } else if (rotate == FB_ROTATE_CW) { 439 for (x = 0; 440 x < num && image->dy + image->height <= info->var.yres; 441 x++) { 442 info->fbops->fb_imageblit(info, image); 443 image->dy += image->height + 8; 444 } 445 } else if (rotate == FB_ROTATE_CCW) { 446 u32 dy = image->dy; 447 448 for (x = 0; x < num && image->dy <= dy; x++) { 449 info->fbops->fb_imageblit(info, image); 450 image->dy -= image->height + 8; 451 } 452 } 453 } 454 455 static int fb_show_logo_line(struct fb_info *info, int rotate, 456 const struct linux_logo *logo, int y, 457 unsigned int n) 458 { 459 u32 *palette = NULL, *saved_pseudo_palette = NULL; 460 unsigned char *logo_new = NULL, *logo_rotate = NULL; 461 struct fb_image image; 462 463 /* Return if the frame buffer is not mapped or suspended */ 464 if (logo == NULL || info->state != FBINFO_STATE_RUNNING || 465 info->fbops->owner) 466 return 0; 467 468 image.depth = 8; 469 image.data = logo->data; 470 471 if (fb_logo.needs_cmapreset) 472 fb_set_logocmap(info, logo); 473 474 if (fb_logo.needs_truepalette || 475 fb_logo.needs_directpalette) { 476 palette = kmalloc(256 * 4, GFP_KERNEL); 477 if (palette == NULL) 478 return 0; 479 480 if (fb_logo.needs_truepalette) 481 fb_set_logo_truepalette(info, logo, palette); 482 else 483 fb_set_logo_directpalette(info, logo, palette); 484 485 saved_pseudo_palette = info->pseudo_palette; 486 info->pseudo_palette = palette; 487 } 488 489 if (fb_logo.depth <= 4) { 490 logo_new = kmalloc_array(logo->width, logo->height, 491 GFP_KERNEL); 492 if (logo_new == NULL) { 493 kfree(palette); 494 if (saved_pseudo_palette) 495 info->pseudo_palette = saved_pseudo_palette; 496 return 0; 497 } 498 image.data = logo_new; 499 fb_set_logo(info, logo, logo_new, fb_logo.depth); 500 } 501 502 if (fb_center_logo) { 503 int xres = info->var.xres; 504 int yres = info->var.yres; 505 506 if (rotate == FB_ROTATE_CW || rotate == FB_ROTATE_CCW) { 507 xres = info->var.yres; 508 yres = info->var.xres; 509 } 510 511 while (n && (n * (logo->width + 8) - 8 > xres)) 512 --n; 513 image.dx = (xres - n * (logo->width + 8) - 8) / 2; 514 image.dy = y ?: (yres - logo->height) / 2; 515 } else { 516 image.dx = 0; 517 image.dy = y; 518 } 519 520 image.width = logo->width; 521 image.height = logo->height; 522 523 if (rotate) { 524 logo_rotate = kmalloc_array(logo->width, logo->height, 525 GFP_KERNEL); 526 if (logo_rotate) 527 fb_rotate_logo(info, logo_rotate, &image, rotate); 528 } 529 530 fb_do_show_logo(info, &image, rotate, n); 531 532 kfree(palette); 533 if (saved_pseudo_palette != NULL) 534 info->pseudo_palette = saved_pseudo_palette; 535 kfree(logo_new); 536 kfree(logo_rotate); 537 return image.dy + logo->height; 538 } 539 540 541 #ifdef CONFIG_FB_LOGO_EXTRA 542 543 #define FB_LOGO_EX_NUM_MAX 10 544 static struct logo_data_extra { 545 const struct linux_logo *logo; 546 unsigned int n; 547 } fb_logo_ex[FB_LOGO_EX_NUM_MAX]; 548 static unsigned int fb_logo_ex_num; 549 550 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n) 551 { 552 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX) 553 return; 554 555 fb_logo_ex[fb_logo_ex_num].logo = logo; 556 fb_logo_ex[fb_logo_ex_num].n = n; 557 fb_logo_ex_num++; 558 } 559 560 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height, 561 unsigned int yres) 562 { 563 unsigned int i; 564 565 /* FIXME: logo_ex supports only truecolor fb. */ 566 if (info->fix.visual != FB_VISUAL_TRUECOLOR) 567 fb_logo_ex_num = 0; 568 569 for (i = 0; i < fb_logo_ex_num; i++) { 570 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) { 571 fb_logo_ex[i].logo = NULL; 572 continue; 573 } 574 height += fb_logo_ex[i].logo->height; 575 if (height > yres) { 576 height -= fb_logo_ex[i].logo->height; 577 fb_logo_ex_num = i; 578 break; 579 } 580 } 581 return height; 582 } 583 584 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate) 585 { 586 unsigned int i; 587 588 for (i = 0; i < fb_logo_ex_num; i++) 589 y = fb_show_logo_line(info, rotate, 590 fb_logo_ex[i].logo, y, fb_logo_ex[i].n); 591 592 return y; 593 } 594 595 #else /* !CONFIG_FB_LOGO_EXTRA */ 596 597 static inline int fb_prepare_extra_logos(struct fb_info *info, 598 unsigned int height, 599 unsigned int yres) 600 { 601 return height; 602 } 603 604 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate) 605 { 606 return y; 607 } 608 609 #endif /* CONFIG_FB_LOGO_EXTRA */ 610 611 612 int fb_prepare_logo(struct fb_info *info, int rotate) 613 { 614 int depth = fb_get_color_depth(&info->var, &info->fix); 615 unsigned int yres; 616 int height; 617 618 memset(&fb_logo, 0, sizeof(struct logo_data)); 619 620 if (info->flags & FBINFO_MISC_TILEBLITTING || 621 info->fbops->owner || !fb_logo_count) 622 return 0; 623 624 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) { 625 depth = info->var.blue.length; 626 if (info->var.red.length < depth) 627 depth = info->var.red.length; 628 if (info->var.green.length < depth) 629 depth = info->var.green.length; 630 } 631 632 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) { 633 /* assume console colormap */ 634 depth = 4; 635 } 636 637 /* Return if no suitable logo was found */ 638 fb_logo.logo = fb_find_logo(depth); 639 640 if (!fb_logo.logo) { 641 return 0; 642 } 643 644 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD) 645 yres = info->var.yres; 646 else 647 yres = info->var.xres; 648 649 if (fb_logo.logo->height > yres) { 650 fb_logo.logo = NULL; 651 return 0; 652 } 653 654 /* What depth we asked for might be different from what we get */ 655 if (fb_logo.logo->type == LINUX_LOGO_CLUT224) 656 fb_logo.depth = 8; 657 else if (fb_logo.logo->type == LINUX_LOGO_VGA16) 658 fb_logo.depth = 4; 659 else 660 fb_logo.depth = 1; 661 662 663 if (fb_logo.depth > 4 && depth > 4) { 664 switch (info->fix.visual) { 665 case FB_VISUAL_TRUECOLOR: 666 fb_logo.needs_truepalette = 1; 667 break; 668 case FB_VISUAL_DIRECTCOLOR: 669 fb_logo.needs_directpalette = 1; 670 fb_logo.needs_cmapreset = 1; 671 break; 672 case FB_VISUAL_PSEUDOCOLOR: 673 fb_logo.needs_cmapreset = 1; 674 break; 675 } 676 } 677 678 height = fb_logo.logo->height; 679 if (fb_center_logo) 680 height += (yres - fb_logo.logo->height) / 2; 681 682 return fb_prepare_extra_logos(info, height, yres); 683 } 684 685 int fb_show_logo(struct fb_info *info, int rotate) 686 { 687 unsigned int count; 688 int y; 689 690 if (!fb_logo_count) 691 return 0; 692 693 count = fb_logo_count < 0 ? num_online_cpus() : fb_logo_count; 694 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0, count); 695 y = fb_show_extra_logos(info, y, rotate); 696 697 return y; 698 } 699 #else 700 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; } 701 int fb_show_logo(struct fb_info *info, int rotate) { return 0; } 702 #endif /* CONFIG_LOGO */ 703 EXPORT_SYMBOL(fb_prepare_logo); 704 EXPORT_SYMBOL(fb_show_logo); 705 706 static void *fb_seq_start(struct seq_file *m, loff_t *pos) 707 { 708 mutex_lock(®istration_lock); 709 return (*pos < FB_MAX) ? pos : NULL; 710 } 711 712 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos) 713 { 714 (*pos)++; 715 return (*pos < FB_MAX) ? pos : NULL; 716 } 717 718 static void fb_seq_stop(struct seq_file *m, void *v) 719 { 720 mutex_unlock(®istration_lock); 721 } 722 723 static int fb_seq_show(struct seq_file *m, void *v) 724 { 725 int i = *(loff_t *)v; 726 struct fb_info *fi = registered_fb[i]; 727 728 if (fi) 729 seq_printf(m, "%d %s\n", fi->node, fi->fix.id); 730 return 0; 731 } 732 733 static const struct seq_operations __maybe_unused proc_fb_seq_ops = { 734 .start = fb_seq_start, 735 .next = fb_seq_next, 736 .stop = fb_seq_stop, 737 .show = fb_seq_show, 738 }; 739 740 /* 741 * We hold a reference to the fb_info in file->private_data, 742 * but if the current registered fb has changed, we don't 743 * actually want to use it. 744 * 745 * So look up the fb_info using the inode minor number, 746 * and just verify it against the reference we have. 747 */ 748 static struct fb_info *file_fb_info(struct file *file) 749 { 750 struct inode *inode = file_inode(file); 751 int fbidx = iminor(inode); 752 struct fb_info *info = registered_fb[fbidx]; 753 754 if (info != file->private_data) 755 info = NULL; 756 return info; 757 } 758 759 static ssize_t 760 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) 761 { 762 unsigned long p = *ppos; 763 struct fb_info *info = file_fb_info(file); 764 u8 *buffer, *dst; 765 u8 __iomem *src; 766 int c, cnt = 0, err = 0; 767 unsigned long total_size; 768 769 if (!info || ! info->screen_base) 770 return -ENODEV; 771 772 if (info->state != FBINFO_STATE_RUNNING) 773 return -EPERM; 774 775 if (info->fbops->fb_read) 776 return info->fbops->fb_read(info, buf, count, ppos); 777 778 total_size = info->screen_size; 779 780 if (total_size == 0) 781 total_size = info->fix.smem_len; 782 783 if (p >= total_size) 784 return 0; 785 786 if (count >= total_size) 787 count = total_size; 788 789 if (count + p > total_size) 790 count = total_size - p; 791 792 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, 793 GFP_KERNEL); 794 if (!buffer) 795 return -ENOMEM; 796 797 src = (u8 __iomem *) (info->screen_base + p); 798 799 if (info->fbops->fb_sync) 800 info->fbops->fb_sync(info); 801 802 while (count) { 803 c = (count > PAGE_SIZE) ? PAGE_SIZE : count; 804 dst = buffer; 805 fb_memcpy_fromfb(dst, src, c); 806 dst += c; 807 src += c; 808 809 if (copy_to_user(buf, buffer, c)) { 810 err = -EFAULT; 811 break; 812 } 813 *ppos += c; 814 buf += c; 815 cnt += c; 816 count -= c; 817 } 818 819 kfree(buffer); 820 821 return (err) ? err : cnt; 822 } 823 824 static ssize_t 825 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) 826 { 827 unsigned long p = *ppos; 828 struct fb_info *info = file_fb_info(file); 829 u8 *buffer, *src; 830 u8 __iomem *dst; 831 int c, cnt = 0, err = 0; 832 unsigned long total_size; 833 834 if (!info || !info->screen_base) 835 return -ENODEV; 836 837 if (info->state != FBINFO_STATE_RUNNING) 838 return -EPERM; 839 840 if (info->fbops->fb_write) 841 return info->fbops->fb_write(info, buf, count, ppos); 842 843 total_size = info->screen_size; 844 845 if (total_size == 0) 846 total_size = info->fix.smem_len; 847 848 if (p > total_size) 849 return -EFBIG; 850 851 if (count > total_size) { 852 err = -EFBIG; 853 count = total_size; 854 } 855 856 if (count + p > total_size) { 857 if (!err) 858 err = -ENOSPC; 859 860 count = total_size - p; 861 } 862 863 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, 864 GFP_KERNEL); 865 if (!buffer) 866 return -ENOMEM; 867 868 dst = (u8 __iomem *) (info->screen_base + p); 869 870 if (info->fbops->fb_sync) 871 info->fbops->fb_sync(info); 872 873 while (count) { 874 c = (count > PAGE_SIZE) ? PAGE_SIZE : count; 875 src = buffer; 876 877 if (copy_from_user(src, buf, c)) { 878 err = -EFAULT; 879 break; 880 } 881 882 fb_memcpy_tofb(dst, src, c); 883 dst += c; 884 src += c; 885 *ppos += c; 886 buf += c; 887 cnt += c; 888 count -= c; 889 } 890 891 kfree(buffer); 892 893 return (cnt) ? cnt : err; 894 } 895 896 int 897 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var) 898 { 899 struct fb_fix_screeninfo *fix = &info->fix; 900 unsigned int yres = info->var.yres; 901 int err = 0; 902 903 if (var->yoffset > 0) { 904 if (var->vmode & FB_VMODE_YWRAP) { 905 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep)) 906 err = -EINVAL; 907 else 908 yres = 0; 909 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep)) 910 err = -EINVAL; 911 } 912 913 if (var->xoffset > 0 && (!fix->xpanstep || 914 (var->xoffset % fix->xpanstep))) 915 err = -EINVAL; 916 917 if (err || !info->fbops->fb_pan_display || 918 var->yoffset > info->var.yres_virtual - yres || 919 var->xoffset > info->var.xres_virtual - info->var.xres) 920 return -EINVAL; 921 922 if ((err = info->fbops->fb_pan_display(var, info))) 923 return err; 924 info->var.xoffset = var->xoffset; 925 info->var.yoffset = var->yoffset; 926 if (var->vmode & FB_VMODE_YWRAP) 927 info->var.vmode |= FB_VMODE_YWRAP; 928 else 929 info->var.vmode &= ~FB_VMODE_YWRAP; 930 return 0; 931 } 932 EXPORT_SYMBOL(fb_pan_display); 933 934 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var, 935 u32 activate) 936 { 937 struct fb_blit_caps caps, fbcaps; 938 int err = 0; 939 940 memset(&caps, 0, sizeof(caps)); 941 memset(&fbcaps, 0, sizeof(fbcaps)); 942 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0; 943 fbcon_get_requirement(info, &caps); 944 info->fbops->fb_get_caps(info, &fbcaps, var); 945 946 if (((fbcaps.x ^ caps.x) & caps.x) || 947 ((fbcaps.y ^ caps.y) & caps.y) || 948 (fbcaps.len < caps.len)) 949 err = -EINVAL; 950 951 return err; 952 } 953 954 int 955 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var) 956 { 957 int ret = 0; 958 u32 activate; 959 struct fb_var_screeninfo old_var; 960 struct fb_videomode mode; 961 struct fb_event event; 962 u32 unused; 963 964 if (var->activate & FB_ACTIVATE_INV_MODE) { 965 struct fb_videomode mode1, mode2; 966 967 fb_var_to_videomode(&mode1, var); 968 fb_var_to_videomode(&mode2, &info->var); 969 /* make sure we don't delete the videomode of current var */ 970 ret = fb_mode_is_equal(&mode1, &mode2); 971 if (!ret) { 972 ret = fbcon_mode_deleted(info, &mode1); 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 /* bitfill_aligned() assumes that it's at least 8x8 */ 1006 if (var->xres < 8 || var->yres < 8) 1007 return -EINVAL; 1008 1009 /* Too huge resolution causes multiplication overflow. */ 1010 if (check_mul_overflow(var->xres, var->yres, &unused) || 1011 check_mul_overflow(var->xres_virtual, var->yres_virtual, &unused)) 1012 return -EINVAL; 1013 1014 ret = info->fbops->fb_check_var(var, info); 1015 1016 if (ret) 1017 return ret; 1018 1019 if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW) 1020 return 0; 1021 1022 if (info->fbops->fb_get_caps) { 1023 ret = fb_check_caps(info, var, activate); 1024 1025 if (ret) 1026 return ret; 1027 } 1028 1029 old_var = info->var; 1030 info->var = *var; 1031 1032 if (info->fbops->fb_set_par) { 1033 ret = info->fbops->fb_set_par(info); 1034 1035 if (ret) { 1036 info->var = old_var; 1037 printk(KERN_WARNING "detected " 1038 "fb_set_par error, " 1039 "error code: %d\n", ret); 1040 return ret; 1041 } 1042 } 1043 1044 fb_pan_display(info, &info->var); 1045 fb_set_cmap(&info->cmap, info); 1046 fb_var_to_videomode(&mode, &info->var); 1047 1048 if (info->modelist.prev && info->modelist.next && 1049 !list_empty(&info->modelist)) 1050 ret = fb_add_videomode(&mode, &info->modelist); 1051 1052 if (ret) 1053 return ret; 1054 1055 event.info = info; 1056 event.data = &mode; 1057 fb_notifier_call_chain(FB_EVENT_MODE_CHANGE, &event); 1058 1059 return 0; 1060 } 1061 EXPORT_SYMBOL(fb_set_var); 1062 1063 int 1064 fb_blank(struct fb_info *info, int blank) 1065 { 1066 struct fb_event event; 1067 int ret = -EINVAL; 1068 1069 if (blank > FB_BLANK_POWERDOWN) 1070 blank = FB_BLANK_POWERDOWN; 1071 1072 event.info = info; 1073 event.data = ␣ 1074 1075 if (info->fbops->fb_blank) 1076 ret = info->fbops->fb_blank(blank, info); 1077 1078 if (!ret) 1079 fb_notifier_call_chain(FB_EVENT_BLANK, &event); 1080 1081 return ret; 1082 } 1083 EXPORT_SYMBOL(fb_blank); 1084 1085 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd, 1086 unsigned long arg) 1087 { 1088 const struct fb_ops *fb; 1089 struct fb_var_screeninfo var; 1090 struct fb_fix_screeninfo fix; 1091 struct fb_cmap cmap_from; 1092 struct fb_cmap_user cmap; 1093 void __user *argp = (void __user *)arg; 1094 long ret = 0; 1095 1096 switch (cmd) { 1097 case FBIOGET_VSCREENINFO: 1098 lock_fb_info(info); 1099 var = info->var; 1100 unlock_fb_info(info); 1101 1102 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0; 1103 break; 1104 case FBIOPUT_VSCREENINFO: 1105 if (copy_from_user(&var, argp, sizeof(var))) 1106 return -EFAULT; 1107 console_lock(); 1108 lock_fb_info(info); 1109 ret = fb_set_var(info, &var); 1110 if (!ret) 1111 fbcon_update_vcs(info, var.activate & FB_ACTIVATE_ALL); 1112 unlock_fb_info(info); 1113 console_unlock(); 1114 if (!ret && copy_to_user(argp, &var, sizeof(var))) 1115 ret = -EFAULT; 1116 break; 1117 case FBIOGET_FSCREENINFO: 1118 lock_fb_info(info); 1119 memcpy(&fix, &info->fix, sizeof(fix)); 1120 if (info->flags & FBINFO_HIDE_SMEM_START) 1121 fix.smem_start = 0; 1122 unlock_fb_info(info); 1123 1124 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0; 1125 break; 1126 case FBIOPUTCMAP: 1127 if (copy_from_user(&cmap, argp, sizeof(cmap))) 1128 return -EFAULT; 1129 ret = fb_set_user_cmap(&cmap, info); 1130 break; 1131 case FBIOGETCMAP: 1132 if (copy_from_user(&cmap, argp, sizeof(cmap))) 1133 return -EFAULT; 1134 lock_fb_info(info); 1135 cmap_from = info->cmap; 1136 unlock_fb_info(info); 1137 ret = fb_cmap_to_user(&cmap_from, &cmap); 1138 break; 1139 case FBIOPAN_DISPLAY: 1140 if (copy_from_user(&var, argp, sizeof(var))) 1141 return -EFAULT; 1142 console_lock(); 1143 lock_fb_info(info); 1144 ret = fb_pan_display(info, &var); 1145 unlock_fb_info(info); 1146 console_unlock(); 1147 if (ret == 0 && copy_to_user(argp, &var, sizeof(var))) 1148 return -EFAULT; 1149 break; 1150 case FBIO_CURSOR: 1151 ret = -EINVAL; 1152 break; 1153 case FBIOGET_CON2FBMAP: 1154 ret = fbcon_get_con2fb_map_ioctl(argp); 1155 break; 1156 case FBIOPUT_CON2FBMAP: 1157 ret = fbcon_set_con2fb_map_ioctl(argp); 1158 break; 1159 case FBIOBLANK: 1160 if (arg > FB_BLANK_POWERDOWN) 1161 return -EINVAL; 1162 console_lock(); 1163 lock_fb_info(info); 1164 ret = fb_blank(info, arg); 1165 /* might again call into fb_blank */ 1166 fbcon_fb_blanked(info, arg); 1167 unlock_fb_info(info); 1168 console_unlock(); 1169 break; 1170 default: 1171 lock_fb_info(info); 1172 fb = info->fbops; 1173 if (fb->fb_ioctl) 1174 ret = fb->fb_ioctl(info, cmd, arg); 1175 else 1176 ret = -ENOTTY; 1177 unlock_fb_info(info); 1178 } 1179 return ret; 1180 } 1181 1182 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1183 { 1184 struct fb_info *info = file_fb_info(file); 1185 1186 if (!info) 1187 return -ENODEV; 1188 return do_fb_ioctl(info, cmd, arg); 1189 } 1190 1191 #ifdef CONFIG_COMPAT 1192 struct fb_fix_screeninfo32 { 1193 char id[16]; 1194 compat_caddr_t smem_start; 1195 u32 smem_len; 1196 u32 type; 1197 u32 type_aux; 1198 u32 visual; 1199 u16 xpanstep; 1200 u16 ypanstep; 1201 u16 ywrapstep; 1202 u32 line_length; 1203 compat_caddr_t mmio_start; 1204 u32 mmio_len; 1205 u32 accel; 1206 u16 reserved[3]; 1207 }; 1208 1209 struct fb_cmap32 { 1210 u32 start; 1211 u32 len; 1212 compat_caddr_t red; 1213 compat_caddr_t green; 1214 compat_caddr_t blue; 1215 compat_caddr_t transp; 1216 }; 1217 1218 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd, 1219 unsigned long arg) 1220 { 1221 struct fb_cmap32 cmap32; 1222 struct fb_cmap cmap_from; 1223 struct fb_cmap_user cmap; 1224 1225 if (copy_from_user(&cmap32, compat_ptr(arg), sizeof(cmap32))) 1226 return -EFAULT; 1227 1228 cmap = (struct fb_cmap_user) { 1229 .start = cmap32.start, 1230 .len = cmap32.len, 1231 .red = compat_ptr(cmap32.red), 1232 .green = compat_ptr(cmap32.green), 1233 .blue = compat_ptr(cmap32.blue), 1234 .transp = compat_ptr(cmap32.transp), 1235 }; 1236 1237 if (cmd == FBIOPUTCMAP) 1238 return fb_set_user_cmap(&cmap, info); 1239 1240 lock_fb_info(info); 1241 cmap_from = info->cmap; 1242 unlock_fb_info(info); 1243 1244 return fb_cmap_to_user(&cmap_from, &cmap); 1245 } 1246 1247 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix, 1248 struct fb_fix_screeninfo32 __user *fix32) 1249 { 1250 __u32 data; 1251 int err; 1252 1253 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id)); 1254 1255 data = (__u32) (unsigned long) fix->smem_start; 1256 err |= put_user(data, &fix32->smem_start); 1257 1258 err |= put_user(fix->smem_len, &fix32->smem_len); 1259 err |= put_user(fix->type, &fix32->type); 1260 err |= put_user(fix->type_aux, &fix32->type_aux); 1261 err |= put_user(fix->visual, &fix32->visual); 1262 err |= put_user(fix->xpanstep, &fix32->xpanstep); 1263 err |= put_user(fix->ypanstep, &fix32->ypanstep); 1264 err |= put_user(fix->ywrapstep, &fix32->ywrapstep); 1265 err |= put_user(fix->line_length, &fix32->line_length); 1266 1267 data = (__u32) (unsigned long) fix->mmio_start; 1268 err |= put_user(data, &fix32->mmio_start); 1269 1270 err |= put_user(fix->mmio_len, &fix32->mmio_len); 1271 err |= put_user(fix->accel, &fix32->accel); 1272 err |= copy_to_user(fix32->reserved, fix->reserved, 1273 sizeof(fix->reserved)); 1274 1275 if (err) 1276 return -EFAULT; 1277 return 0; 1278 } 1279 1280 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd, 1281 unsigned long arg) 1282 { 1283 struct fb_fix_screeninfo fix; 1284 1285 lock_fb_info(info); 1286 fix = info->fix; 1287 if (info->flags & FBINFO_HIDE_SMEM_START) 1288 fix.smem_start = 0; 1289 unlock_fb_info(info); 1290 return do_fscreeninfo_to_user(&fix, compat_ptr(arg)); 1291 } 1292 1293 static long fb_compat_ioctl(struct file *file, unsigned int cmd, 1294 unsigned long arg) 1295 { 1296 struct fb_info *info = file_fb_info(file); 1297 const struct fb_ops *fb; 1298 long ret = -ENOIOCTLCMD; 1299 1300 if (!info) 1301 return -ENODEV; 1302 fb = info->fbops; 1303 switch(cmd) { 1304 case FBIOGET_VSCREENINFO: 1305 case FBIOPUT_VSCREENINFO: 1306 case FBIOPAN_DISPLAY: 1307 case FBIOGET_CON2FBMAP: 1308 case FBIOPUT_CON2FBMAP: 1309 arg = (unsigned long) compat_ptr(arg); 1310 fallthrough; 1311 case FBIOBLANK: 1312 ret = do_fb_ioctl(info, cmd, arg); 1313 break; 1314 1315 case FBIOGET_FSCREENINFO: 1316 ret = fb_get_fscreeninfo(info, cmd, arg); 1317 break; 1318 1319 case FBIOGETCMAP: 1320 case FBIOPUTCMAP: 1321 ret = fb_getput_cmap(info, cmd, arg); 1322 break; 1323 1324 default: 1325 if (fb->fb_compat_ioctl) 1326 ret = fb->fb_compat_ioctl(info, cmd, arg); 1327 break; 1328 } 1329 return ret; 1330 } 1331 #endif 1332 1333 static int 1334 fb_mmap(struct file *file, struct vm_area_struct * vma) 1335 { 1336 struct fb_info *info = file_fb_info(file); 1337 unsigned long mmio_pgoff; 1338 unsigned long start; 1339 u32 len; 1340 1341 if (!info) 1342 return -ENODEV; 1343 mutex_lock(&info->mm_lock); 1344 1345 if (info->fbops->fb_mmap) { 1346 int res; 1347 1348 /* 1349 * The framebuffer needs to be accessed decrypted, be sure 1350 * SME protection is removed ahead of the call 1351 */ 1352 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); 1353 res = info->fbops->fb_mmap(info, vma); 1354 mutex_unlock(&info->mm_lock); 1355 return res; 1356 #if IS_ENABLED(CONFIG_FB_DEFERRED_IO) 1357 } else if (info->fbdefio) { 1358 /* 1359 * FB deferred I/O wants you to handle mmap in your drivers. At a 1360 * minimum, point struct fb_ops.fb_mmap to fb_deferred_io_mmap(). 1361 */ 1362 dev_warn_once(info->dev, "fbdev mmap not set up for deferred I/O.\n"); 1363 mutex_unlock(&info->mm_lock); 1364 return -ENODEV; 1365 #endif 1366 } 1367 1368 /* 1369 * Ugh. This can be either the frame buffer mapping, or 1370 * if pgoff points past it, the mmio mapping. 1371 */ 1372 start = info->fix.smem_start; 1373 len = info->fix.smem_len; 1374 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT; 1375 if (vma->vm_pgoff >= mmio_pgoff) { 1376 if (info->var.accel_flags) { 1377 mutex_unlock(&info->mm_lock); 1378 return -EINVAL; 1379 } 1380 1381 vma->vm_pgoff -= mmio_pgoff; 1382 start = info->fix.mmio_start; 1383 len = info->fix.mmio_len; 1384 } 1385 mutex_unlock(&info->mm_lock); 1386 1387 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); 1388 fb_pgprotect(file, vma, start); 1389 1390 return vm_iomap_memory(vma, start, len); 1391 } 1392 1393 static int 1394 fb_open(struct inode *inode, struct file *file) 1395 __acquires(&info->lock) 1396 __releases(&info->lock) 1397 { 1398 int fbidx = iminor(inode); 1399 struct fb_info *info; 1400 int res = 0; 1401 1402 info = get_fb_info(fbidx); 1403 if (!info) { 1404 request_module("fb%d", fbidx); 1405 info = get_fb_info(fbidx); 1406 if (!info) 1407 return -ENODEV; 1408 } 1409 if (IS_ERR(info)) 1410 return PTR_ERR(info); 1411 1412 lock_fb_info(info); 1413 if (!try_module_get(info->fbops->owner)) { 1414 res = -ENODEV; 1415 goto out; 1416 } 1417 file->private_data = info; 1418 if (info->fbops->fb_open) { 1419 res = info->fbops->fb_open(info,1); 1420 if (res) 1421 module_put(info->fbops->owner); 1422 } 1423 #ifdef CONFIG_FB_DEFERRED_IO 1424 if (info->fbdefio) 1425 fb_deferred_io_open(info, inode, file); 1426 #endif 1427 out: 1428 unlock_fb_info(info); 1429 if (res) 1430 put_fb_info(info); 1431 return res; 1432 } 1433 1434 static int 1435 fb_release(struct inode *inode, struct file *file) 1436 __acquires(&info->lock) 1437 __releases(&info->lock) 1438 { 1439 struct fb_info * const info = file->private_data; 1440 1441 lock_fb_info(info); 1442 if (info->fbops->fb_release) 1443 info->fbops->fb_release(info,1); 1444 module_put(info->fbops->owner); 1445 unlock_fb_info(info); 1446 put_fb_info(info); 1447 return 0; 1448 } 1449 1450 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU) 1451 unsigned long get_fb_unmapped_area(struct file *filp, 1452 unsigned long addr, unsigned long len, 1453 unsigned long pgoff, unsigned long flags) 1454 { 1455 struct fb_info * const info = filp->private_data; 1456 unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len); 1457 1458 if (pgoff > fb_size || len > fb_size - pgoff) 1459 return -EINVAL; 1460 1461 return (unsigned long)info->screen_base + pgoff; 1462 } 1463 #endif 1464 1465 static const struct file_operations fb_fops = { 1466 .owner = THIS_MODULE, 1467 .read = fb_read, 1468 .write = fb_write, 1469 .unlocked_ioctl = fb_ioctl, 1470 #ifdef CONFIG_COMPAT 1471 .compat_ioctl = fb_compat_ioctl, 1472 #endif 1473 .mmap = fb_mmap, 1474 .open = fb_open, 1475 .release = fb_release, 1476 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \ 1477 (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \ 1478 !defined(CONFIG_MMU)) 1479 .get_unmapped_area = get_fb_unmapped_area, 1480 #endif 1481 #ifdef CONFIG_FB_DEFERRED_IO 1482 .fsync = fb_deferred_io_fsync, 1483 #endif 1484 .llseek = default_llseek, 1485 }; 1486 1487 struct class *fb_class; 1488 EXPORT_SYMBOL(fb_class); 1489 1490 static int fb_check_foreignness(struct fb_info *fi) 1491 { 1492 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN; 1493 1494 fi->flags &= ~FBINFO_FOREIGN_ENDIAN; 1495 1496 #ifdef __BIG_ENDIAN 1497 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH; 1498 #else 1499 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0; 1500 #endif /* __BIG_ENDIAN */ 1501 1502 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) { 1503 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to " 1504 "support this framebuffer\n", fi->fix.id); 1505 return -ENOSYS; 1506 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) { 1507 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to " 1508 "support this framebuffer\n", fi->fix.id); 1509 return -ENOSYS; 1510 } 1511 1512 return 0; 1513 } 1514 1515 static bool apertures_overlap(struct aperture *gen, struct aperture *hw) 1516 { 1517 /* is the generic aperture base the same as the HW one */ 1518 if (gen->base == hw->base) 1519 return true; 1520 /* is the generic aperture base inside the hw base->hw base+size */ 1521 if (gen->base > hw->base && gen->base < hw->base + hw->size) 1522 return true; 1523 return false; 1524 } 1525 1526 static bool fb_do_apertures_overlap(struct apertures_struct *gena, 1527 struct apertures_struct *hwa) 1528 { 1529 int i, j; 1530 if (!hwa || !gena) 1531 return false; 1532 1533 for (i = 0; i < hwa->count; ++i) { 1534 struct aperture *h = &hwa->ranges[i]; 1535 for (j = 0; j < gena->count; ++j) { 1536 struct aperture *g = &gena->ranges[j]; 1537 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n", 1538 (unsigned long long)g->base, 1539 (unsigned long long)g->size, 1540 (unsigned long long)h->base, 1541 (unsigned long long)h->size); 1542 if (apertures_overlap(g, h)) 1543 return true; 1544 } 1545 } 1546 1547 return false; 1548 } 1549 1550 static void do_unregister_framebuffer(struct fb_info *fb_info); 1551 1552 #define VGA_FB_PHYS 0xA0000 1553 static void do_remove_conflicting_framebuffers(struct apertures_struct *a, 1554 const char *name, bool primary) 1555 { 1556 int i; 1557 1558 /* check all firmware fbs and kick off if the base addr overlaps */ 1559 for_each_registered_fb(i) { 1560 struct apertures_struct *gen_aper; 1561 struct device *device; 1562 1563 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE)) 1564 continue; 1565 1566 gen_aper = registered_fb[i]->apertures; 1567 device = registered_fb[i]->device; 1568 if (fb_do_apertures_overlap(gen_aper, a) || 1569 (primary && gen_aper && gen_aper->count && 1570 gen_aper->ranges[0].base == VGA_FB_PHYS)) { 1571 1572 printk(KERN_INFO "fb%d: switching to %s from %s\n", 1573 i, name, registered_fb[i]->fix.id); 1574 1575 /* 1576 * If we kick-out a firmware driver, we also want to remove 1577 * the underlying platform device, such as simple-framebuffer, 1578 * VESA, EFI, etc. A native driver will then be able to 1579 * allocate the memory range. 1580 * 1581 * If it's not a platform device, at least print a warning. A 1582 * fix would add code to remove the device from the system. For 1583 * framebuffers without any Linux device, print a warning as 1584 * well. 1585 */ 1586 if (!device) { 1587 pr_warn("fb%d: no device set\n", i); 1588 do_unregister_framebuffer(registered_fb[i]); 1589 } else if (dev_is_platform(device)) { 1590 registered_fb[i]->forced_out = true; 1591 platform_device_unregister(to_platform_device(device)); 1592 } else { 1593 pr_warn("fb%d: cannot remove device\n", i); 1594 do_unregister_framebuffer(registered_fb[i]); 1595 } 1596 } 1597 } 1598 } 1599 1600 static int do_register_framebuffer(struct fb_info *fb_info) 1601 { 1602 int i; 1603 struct fb_videomode mode; 1604 1605 if (fb_check_foreignness(fb_info)) 1606 return -ENOSYS; 1607 1608 do_remove_conflicting_framebuffers(fb_info->apertures, 1609 fb_info->fix.id, 1610 fb_is_primary_device(fb_info)); 1611 1612 if (num_registered_fb == FB_MAX) 1613 return -ENXIO; 1614 1615 num_registered_fb++; 1616 for (i = 0 ; i < FB_MAX; i++) 1617 if (!registered_fb[i]) 1618 break; 1619 fb_info->node = i; 1620 refcount_set(&fb_info->count, 1); 1621 mutex_init(&fb_info->lock); 1622 mutex_init(&fb_info->mm_lock); 1623 1624 fb_info->dev = device_create(fb_class, fb_info->device, 1625 MKDEV(FB_MAJOR, i), NULL, "fb%d", i); 1626 if (IS_ERR(fb_info->dev)) { 1627 /* Not fatal */ 1628 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev)); 1629 fb_info->dev = NULL; 1630 } else 1631 fb_init_device(fb_info); 1632 1633 if (fb_info->pixmap.addr == NULL) { 1634 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL); 1635 if (fb_info->pixmap.addr) { 1636 fb_info->pixmap.size = FBPIXMAPSIZE; 1637 fb_info->pixmap.buf_align = 1; 1638 fb_info->pixmap.scan_align = 1; 1639 fb_info->pixmap.access_align = 32; 1640 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT; 1641 } 1642 } 1643 fb_info->pixmap.offset = 0; 1644 1645 if (!fb_info->pixmap.blit_x) 1646 fb_info->pixmap.blit_x = ~(u32)0; 1647 1648 if (!fb_info->pixmap.blit_y) 1649 fb_info->pixmap.blit_y = ~(u32)0; 1650 1651 if (!fb_info->modelist.prev || !fb_info->modelist.next) 1652 INIT_LIST_HEAD(&fb_info->modelist); 1653 1654 if (fb_info->skip_vt_switch) 1655 pm_vt_switch_required(fb_info->dev, false); 1656 else 1657 pm_vt_switch_required(fb_info->dev, true); 1658 1659 fb_var_to_videomode(&mode, &fb_info->var); 1660 fb_add_videomode(&mode, &fb_info->modelist); 1661 registered_fb[i] = fb_info; 1662 1663 #ifdef CONFIG_GUMSTIX_AM200EPD 1664 { 1665 struct fb_event event; 1666 event.info = fb_info; 1667 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event); 1668 } 1669 #endif 1670 1671 return fbcon_fb_registered(fb_info); 1672 } 1673 1674 static void unbind_console(struct fb_info *fb_info) 1675 { 1676 int i = fb_info->node; 1677 1678 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)) 1679 return; 1680 1681 fbcon_fb_unbind(fb_info); 1682 } 1683 1684 static void unlink_framebuffer(struct fb_info *fb_info) 1685 { 1686 int i; 1687 1688 i = fb_info->node; 1689 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)) 1690 return; 1691 1692 if (!fb_info->dev) 1693 return; 1694 1695 device_destroy(fb_class, MKDEV(FB_MAJOR, i)); 1696 1697 pm_vt_switch_unregister(fb_info->dev); 1698 1699 unbind_console(fb_info); 1700 1701 fb_info->dev = NULL; 1702 } 1703 1704 static void do_unregister_framebuffer(struct fb_info *fb_info) 1705 { 1706 unlink_framebuffer(fb_info); 1707 if (fb_info->pixmap.addr && 1708 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) { 1709 kfree(fb_info->pixmap.addr); 1710 fb_info->pixmap.addr = NULL; 1711 } 1712 1713 fb_destroy_modelist(&fb_info->modelist); 1714 registered_fb[fb_info->node] = NULL; 1715 num_registered_fb--; 1716 fb_cleanup_device(fb_info); 1717 #ifdef CONFIG_GUMSTIX_AM200EPD 1718 { 1719 struct fb_event event; 1720 event.info = fb_info; 1721 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event); 1722 } 1723 #endif 1724 fbcon_fb_unregistered(fb_info); 1725 1726 /* this may free fb info */ 1727 put_fb_info(fb_info); 1728 } 1729 1730 /** 1731 * remove_conflicting_framebuffers - remove firmware-configured framebuffers 1732 * @a: memory range, users of which are to be removed 1733 * @name: requesting driver name 1734 * @primary: also kick vga16fb if present 1735 * 1736 * This function removes framebuffer devices (initialized by firmware/bootloader) 1737 * which use memory range described by @a. If @a is NULL all such devices are 1738 * removed. 1739 */ 1740 int remove_conflicting_framebuffers(struct apertures_struct *a, 1741 const char *name, bool primary) 1742 { 1743 bool do_free = false; 1744 1745 if (!a) { 1746 a = alloc_apertures(1); 1747 if (!a) 1748 return -ENOMEM; 1749 1750 a->ranges[0].base = 0; 1751 a->ranges[0].size = ~0; 1752 do_free = true; 1753 } 1754 1755 mutex_lock(®istration_lock); 1756 do_remove_conflicting_framebuffers(a, name, primary); 1757 mutex_unlock(®istration_lock); 1758 1759 if (do_free) 1760 kfree(a); 1761 1762 return 0; 1763 } 1764 EXPORT_SYMBOL(remove_conflicting_framebuffers); 1765 1766 /** 1767 * remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices 1768 * @pdev: PCI device 1769 * @name: requesting driver name 1770 * 1771 * This function removes framebuffer devices (eg. initialized by firmware) 1772 * using memory range configured for any of @pdev's memory bars. 1773 * 1774 * The function assumes that PCI device with shadowed ROM drives a primary 1775 * display and so kicks out vga16fb. 1776 */ 1777 int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, const char *name) 1778 { 1779 struct apertures_struct *ap; 1780 bool primary = false; 1781 int err, idx, bar; 1782 1783 for (idx = 0, bar = 0; bar < PCI_STD_NUM_BARS; bar++) { 1784 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) 1785 continue; 1786 idx++; 1787 } 1788 1789 ap = alloc_apertures(idx); 1790 if (!ap) 1791 return -ENOMEM; 1792 1793 for (idx = 0, bar = 0; bar < PCI_STD_NUM_BARS; bar++) { 1794 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) 1795 continue; 1796 ap->ranges[idx].base = pci_resource_start(pdev, bar); 1797 ap->ranges[idx].size = pci_resource_len(pdev, bar); 1798 pci_dbg(pdev, "%s: bar %d: 0x%lx -> 0x%lx\n", __func__, bar, 1799 (unsigned long)pci_resource_start(pdev, bar), 1800 (unsigned long)pci_resource_end(pdev, bar)); 1801 idx++; 1802 } 1803 1804 #ifdef CONFIG_X86 1805 primary = pdev->resource[PCI_ROM_RESOURCE].flags & 1806 IORESOURCE_ROM_SHADOW; 1807 #endif 1808 err = remove_conflicting_framebuffers(ap, name, primary); 1809 kfree(ap); 1810 return err; 1811 } 1812 EXPORT_SYMBOL(remove_conflicting_pci_framebuffers); 1813 1814 /** 1815 * register_framebuffer - registers a frame buffer device 1816 * @fb_info: frame buffer info structure 1817 * 1818 * Registers a frame buffer device @fb_info. 1819 * 1820 * Returns negative errno on error, or zero for success. 1821 * 1822 */ 1823 int 1824 register_framebuffer(struct fb_info *fb_info) 1825 { 1826 int ret; 1827 1828 mutex_lock(®istration_lock); 1829 ret = do_register_framebuffer(fb_info); 1830 mutex_unlock(®istration_lock); 1831 1832 return ret; 1833 } 1834 EXPORT_SYMBOL(register_framebuffer); 1835 1836 /** 1837 * unregister_framebuffer - releases a frame buffer device 1838 * @fb_info: frame buffer info structure 1839 * 1840 * Unregisters a frame buffer device @fb_info. 1841 * 1842 * Returns negative errno on error, or zero for success. 1843 * 1844 * This function will also notify the framebuffer console 1845 * to release the driver. 1846 * 1847 * This is meant to be called within a driver's module_exit() 1848 * function. If this is called outside module_exit(), ensure 1849 * that the driver implements fb_open() and fb_release() to 1850 * check that no processes are using the device. 1851 */ 1852 void 1853 unregister_framebuffer(struct fb_info *fb_info) 1854 { 1855 bool forced_out = fb_info->forced_out; 1856 1857 if (!forced_out) 1858 mutex_lock(®istration_lock); 1859 do_unregister_framebuffer(fb_info); 1860 if (!forced_out) 1861 mutex_unlock(®istration_lock); 1862 } 1863 EXPORT_SYMBOL(unregister_framebuffer); 1864 1865 /** 1866 * fb_set_suspend - low level driver signals suspend 1867 * @info: framebuffer affected 1868 * @state: 0 = resuming, !=0 = suspending 1869 * 1870 * This is meant to be used by low level drivers to 1871 * signal suspend/resume to the core & clients. 1872 * It must be called with the console semaphore held 1873 */ 1874 void fb_set_suspend(struct fb_info *info, int state) 1875 { 1876 WARN_CONSOLE_UNLOCKED(); 1877 1878 if (state) { 1879 fbcon_suspended(info); 1880 info->state = FBINFO_STATE_SUSPENDED; 1881 } else { 1882 info->state = FBINFO_STATE_RUNNING; 1883 fbcon_resumed(info); 1884 } 1885 } 1886 EXPORT_SYMBOL(fb_set_suspend); 1887 1888 /** 1889 * fbmem_init - init frame buffer subsystem 1890 * 1891 * Initialize the frame buffer subsystem. 1892 * 1893 * NOTE: This function is _only_ to be called by drivers/char/mem.c. 1894 * 1895 */ 1896 1897 static int __init 1898 fbmem_init(void) 1899 { 1900 int ret; 1901 1902 if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops)) 1903 return -ENOMEM; 1904 1905 ret = register_chrdev(FB_MAJOR, "fb", &fb_fops); 1906 if (ret) { 1907 printk("unable to get major %d for fb devs\n", FB_MAJOR); 1908 goto err_chrdev; 1909 } 1910 1911 fb_class = class_create(THIS_MODULE, "graphics"); 1912 if (IS_ERR(fb_class)) { 1913 ret = PTR_ERR(fb_class); 1914 pr_warn("Unable to create fb class; errno = %d\n", ret); 1915 fb_class = NULL; 1916 goto err_class; 1917 } 1918 1919 fb_console_init(); 1920 1921 return 0; 1922 1923 err_class: 1924 unregister_chrdev(FB_MAJOR, "fb"); 1925 err_chrdev: 1926 remove_proc_entry("fb", NULL); 1927 return ret; 1928 } 1929 1930 #ifdef MODULE 1931 module_init(fbmem_init); 1932 static void __exit 1933 fbmem_exit(void) 1934 { 1935 fb_console_exit(); 1936 1937 remove_proc_entry("fb", NULL); 1938 class_destroy(fb_class); 1939 unregister_chrdev(FB_MAJOR, "fb"); 1940 } 1941 1942 module_exit(fbmem_exit); 1943 MODULE_LICENSE("GPL"); 1944 MODULE_DESCRIPTION("Framebuffer base"); 1945 #else 1946 subsys_initcall(fbmem_init); 1947 #endif 1948 1949 int fb_new_modelist(struct fb_info *info) 1950 { 1951 struct fb_var_screeninfo var = info->var; 1952 struct list_head *pos, *n; 1953 struct fb_modelist *modelist; 1954 struct fb_videomode *m, mode; 1955 int err; 1956 1957 list_for_each_safe(pos, n, &info->modelist) { 1958 modelist = list_entry(pos, struct fb_modelist, list); 1959 m = &modelist->mode; 1960 fb_videomode_to_var(&var, m); 1961 var.activate = FB_ACTIVATE_TEST; 1962 err = fb_set_var(info, &var); 1963 fb_var_to_videomode(&mode, &var); 1964 if (err || !fb_mode_is_equal(m, &mode)) { 1965 list_del(pos); 1966 kfree(pos); 1967 } 1968 } 1969 1970 if (list_empty(&info->modelist)) 1971 return 1; 1972 1973 fbcon_new_modelist(info); 1974 1975 return 0; 1976 } 1977 1978 MODULE_LICENSE("GPL"); 1979