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 int lock_fb_info(struct fb_info *info) 84 { 85 mutex_lock(&info->lock); 86 if (!info->fbops) { 87 mutex_unlock(&info->lock); 88 return 0; 89 } 90 return 1; 91 } 92 EXPORT_SYMBOL(lock_fb_info); 93 94 /* 95 * Helpers 96 */ 97 98 int fb_get_color_depth(struct fb_var_screeninfo *var, 99 struct fb_fix_screeninfo *fix) 100 { 101 int depth = 0; 102 103 if (fix->visual == FB_VISUAL_MONO01 || 104 fix->visual == FB_VISUAL_MONO10) 105 depth = 1; 106 else { 107 if (var->green.length == var->blue.length && 108 var->green.length == var->red.length && 109 var->green.offset == var->blue.offset && 110 var->green.offset == var->red.offset) 111 depth = var->green.length; 112 else 113 depth = var->green.length + var->red.length + 114 var->blue.length; 115 } 116 117 return depth; 118 } 119 EXPORT_SYMBOL(fb_get_color_depth); 120 121 /* 122 * Data padding functions. 123 */ 124 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height) 125 { 126 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height); 127 } 128 EXPORT_SYMBOL(fb_pad_aligned_buffer); 129 130 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height, 131 u32 shift_high, u32 shift_low, u32 mod) 132 { 133 u8 mask = (u8) (0xfff << shift_high), tmp; 134 int i, j; 135 136 for (i = height; i--; ) { 137 for (j = 0; j < idx; j++) { 138 tmp = dst[j]; 139 tmp &= mask; 140 tmp |= *src >> shift_low; 141 dst[j] = tmp; 142 tmp = *src << shift_high; 143 dst[j+1] = tmp; 144 src++; 145 } 146 tmp = dst[idx]; 147 tmp &= mask; 148 tmp |= *src >> shift_low; 149 dst[idx] = tmp; 150 if (shift_high < mod) { 151 tmp = *src << shift_high; 152 dst[idx+1] = tmp; 153 } 154 src++; 155 dst += d_pitch; 156 } 157 } 158 EXPORT_SYMBOL(fb_pad_unaligned_buffer); 159 160 /* 161 * we need to lock this section since fb_cursor 162 * may use fb_imageblit() 163 */ 164 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size) 165 { 166 u32 align = buf->buf_align - 1, offset; 167 char *addr = buf->addr; 168 169 /* If IO mapped, we need to sync before access, no sharing of 170 * the pixmap is done 171 */ 172 if (buf->flags & FB_PIXMAP_IO) { 173 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) 174 info->fbops->fb_sync(info); 175 return addr; 176 } 177 178 /* See if we fit in the remaining pixmap space */ 179 offset = buf->offset + align; 180 offset &= ~align; 181 if (offset + size > buf->size) { 182 /* We do not fit. In order to be able to re-use the buffer, 183 * we must ensure no asynchronous DMA'ing or whatever operation 184 * is in progress, we sync for that. 185 */ 186 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) 187 info->fbops->fb_sync(info); 188 offset = 0; 189 } 190 buf->offset = offset + size; 191 addr += offset; 192 193 return addr; 194 } 195 EXPORT_SYMBOL(fb_get_buffer_offset); 196 197 #ifdef CONFIG_LOGO 198 199 static inline unsigned safe_shift(unsigned d, int n) 200 { 201 return n < 0 ? d >> -n : d << n; 202 } 203 204 static void fb_set_logocmap(struct fb_info *info, 205 const struct linux_logo *logo) 206 { 207 struct fb_cmap palette_cmap; 208 u16 palette_green[16]; 209 u16 palette_blue[16]; 210 u16 palette_red[16]; 211 int i, j, n; 212 const unsigned char *clut = logo->clut; 213 214 palette_cmap.start = 0; 215 palette_cmap.len = 16; 216 palette_cmap.red = palette_red; 217 palette_cmap.green = palette_green; 218 palette_cmap.blue = palette_blue; 219 palette_cmap.transp = NULL; 220 221 for (i = 0; i < logo->clutsize; i += n) { 222 n = logo->clutsize - i; 223 /* palette_cmap provides space for only 16 colors at once */ 224 if (n > 16) 225 n = 16; 226 palette_cmap.start = 32 + i; 227 palette_cmap.len = n; 228 for (j = 0; j < n; ++j) { 229 palette_cmap.red[j] = clut[0] << 8 | clut[0]; 230 palette_cmap.green[j] = clut[1] << 8 | clut[1]; 231 palette_cmap.blue[j] = clut[2] << 8 | clut[2]; 232 clut += 3; 233 } 234 fb_set_cmap(&palette_cmap, info); 235 } 236 } 237 238 static void fb_set_logo_truepalette(struct fb_info *info, 239 const struct linux_logo *logo, 240 u32 *palette) 241 { 242 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff }; 243 unsigned char redmask, greenmask, bluemask; 244 int redshift, greenshift, blueshift; 245 int i; 246 const unsigned char *clut = logo->clut; 247 248 /* 249 * We have to create a temporary palette since console palette is only 250 * 16 colors long. 251 */ 252 /* Bug: Doesn't obey msb_right ... (who needs that?) */ 253 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8]; 254 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8]; 255 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8]; 256 redshift = info->var.red.offset - (8 - info->var.red.length); 257 greenshift = info->var.green.offset - (8 - info->var.green.length); 258 blueshift = info->var.blue.offset - (8 - info->var.blue.length); 259 260 for ( i = 0; i < logo->clutsize; i++) { 261 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) | 262 safe_shift((clut[1] & greenmask), greenshift) | 263 safe_shift((clut[2] & bluemask), blueshift)); 264 clut += 3; 265 } 266 } 267 268 static void fb_set_logo_directpalette(struct fb_info *info, 269 const struct linux_logo *logo, 270 u32 *palette) 271 { 272 int redshift, greenshift, blueshift; 273 int i; 274 275 redshift = info->var.red.offset; 276 greenshift = info->var.green.offset; 277 blueshift = info->var.blue.offset; 278 279 for (i = 32; i < 32 + logo->clutsize; i++) 280 palette[i] = i << redshift | i << greenshift | i << blueshift; 281 } 282 283 static void fb_set_logo(struct fb_info *info, 284 const struct linux_logo *logo, u8 *dst, 285 int depth) 286 { 287 int i, j, k; 288 const u8 *src = logo->data; 289 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0; 290 u8 fg = 1, d; 291 292 switch (fb_get_color_depth(&info->var, &info->fix)) { 293 case 1: 294 fg = 1; 295 break; 296 case 2: 297 fg = 3; 298 break; 299 default: 300 fg = 7; 301 break; 302 } 303 304 if (info->fix.visual == FB_VISUAL_MONO01 || 305 info->fix.visual == FB_VISUAL_MONO10) 306 fg = ~((u8) (0xfff << info->var.green.length)); 307 308 switch (depth) { 309 case 4: 310 for (i = 0; i < logo->height; i++) 311 for (j = 0; j < logo->width; src++) { 312 *dst++ = *src >> 4; 313 j++; 314 if (j < logo->width) { 315 *dst++ = *src & 0x0f; 316 j++; 317 } 318 } 319 break; 320 case 1: 321 for (i = 0; i < logo->height; i++) { 322 for (j = 0; j < logo->width; src++) { 323 d = *src ^ xor; 324 for (k = 7; k >= 0 && j < logo->width; k--) { 325 *dst++ = ((d >> k) & 1) ? fg : 0; 326 j++; 327 } 328 } 329 } 330 break; 331 } 332 } 333 334 /* 335 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors), 336 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on 337 * the visual format and color depth of the framebuffer, the DAC, the 338 * pseudo_palette, and the logo data will be adjusted accordingly. 339 * 340 * Case 1 - linux_logo_clut224: 341 * Color exceeds the number of console colors (16), thus we set the hardware DAC 342 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set. 343 * 344 * For visuals that require color info from the pseudo_palette, we also construct 345 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags 346 * will be set. 347 * 348 * Case 2 - linux_logo_vga16: 349 * The number of colors just matches the console colors, thus there is no need 350 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie, 351 * each byte contains color information for two pixels (upper and lower nibble). 352 * To be consistent with fb_imageblit() usage, we therefore separate the two 353 * nibbles into separate bytes. The "depth" flag will be set to 4. 354 * 355 * Case 3 - linux_logo_mono: 356 * This is similar with Case 2. Each byte contains information for 8 pixels. 357 * We isolate each bit and expand each into a byte. The "depth" flag will 358 * be set to 1. 359 */ 360 static struct logo_data { 361 int depth; 362 int needs_directpalette; 363 int needs_truepalette; 364 int needs_cmapreset; 365 const struct linux_logo *logo; 366 } fb_logo __read_mostly; 367 368 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height) 369 { 370 u32 size = width * height, i; 371 372 out += size - 1; 373 374 for (i = size; i--; ) 375 *out-- = *in++; 376 } 377 378 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height) 379 { 380 int i, j, h = height - 1; 381 382 for (i = 0; i < height; i++) 383 for (j = 0; j < width; j++) 384 out[height * j + h - i] = *in++; 385 } 386 387 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height) 388 { 389 int i, j, w = width - 1; 390 391 for (i = 0; i < height; i++) 392 for (j = 0; j < width; j++) 393 out[height * (w - j) + i] = *in++; 394 } 395 396 static void fb_rotate_logo(struct fb_info *info, u8 *dst, 397 struct fb_image *image, int rotate) 398 { 399 u32 tmp; 400 401 if (rotate == FB_ROTATE_UD) { 402 fb_rotate_logo_ud(image->data, dst, image->width, 403 image->height); 404 image->dx = info->var.xres - image->width - image->dx; 405 image->dy = info->var.yres - image->height - image->dy; 406 } else if (rotate == FB_ROTATE_CW) { 407 fb_rotate_logo_cw(image->data, dst, image->width, 408 image->height); 409 tmp = image->width; 410 image->width = image->height; 411 image->height = tmp; 412 tmp = image->dy; 413 image->dy = image->dx; 414 image->dx = info->var.xres - image->width - tmp; 415 } else if (rotate == FB_ROTATE_CCW) { 416 fb_rotate_logo_ccw(image->data, dst, image->width, 417 image->height); 418 tmp = image->width; 419 image->width = image->height; 420 image->height = tmp; 421 tmp = image->dx; 422 image->dx = image->dy; 423 image->dy = info->var.yres - image->height - tmp; 424 } 425 426 image->data = dst; 427 } 428 429 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image, 430 int rotate, unsigned int num) 431 { 432 unsigned int x; 433 434 if (image->width > info->var.xres || image->height > info->var.yres) 435 return; 436 437 if (rotate == FB_ROTATE_UR) { 438 for (x = 0; 439 x < num && image->dx + image->width <= info->var.xres; 440 x++) { 441 info->fbops->fb_imageblit(info, image); 442 image->dx += image->width + 8; 443 } 444 } else if (rotate == FB_ROTATE_UD) { 445 u32 dx = image->dx; 446 447 for (x = 0; x < num && image->dx <= dx; x++) { 448 info->fbops->fb_imageblit(info, image); 449 image->dx -= image->width + 8; 450 } 451 } else if (rotate == FB_ROTATE_CW) { 452 for (x = 0; 453 x < num && image->dy + image->height <= info->var.yres; 454 x++) { 455 info->fbops->fb_imageblit(info, image); 456 image->dy += image->height + 8; 457 } 458 } else if (rotate == FB_ROTATE_CCW) { 459 u32 dy = image->dy; 460 461 for (x = 0; x < num && image->dy <= dy; x++) { 462 info->fbops->fb_imageblit(info, image); 463 image->dy -= image->height + 8; 464 } 465 } 466 } 467 468 static int fb_show_logo_line(struct fb_info *info, int rotate, 469 const struct linux_logo *logo, int y, 470 unsigned int n) 471 { 472 u32 *palette = NULL, *saved_pseudo_palette = NULL; 473 unsigned char *logo_new = NULL, *logo_rotate = NULL; 474 struct fb_image image; 475 476 /* Return if the frame buffer is not mapped or suspended */ 477 if (logo == NULL || info->state != FBINFO_STATE_RUNNING || 478 info->fbops->owner) 479 return 0; 480 481 image.depth = 8; 482 image.data = logo->data; 483 484 if (fb_logo.needs_cmapreset) 485 fb_set_logocmap(info, logo); 486 487 if (fb_logo.needs_truepalette || 488 fb_logo.needs_directpalette) { 489 palette = kmalloc(256 * 4, GFP_KERNEL); 490 if (palette == NULL) 491 return 0; 492 493 if (fb_logo.needs_truepalette) 494 fb_set_logo_truepalette(info, logo, palette); 495 else 496 fb_set_logo_directpalette(info, logo, palette); 497 498 saved_pseudo_palette = info->pseudo_palette; 499 info->pseudo_palette = palette; 500 } 501 502 if (fb_logo.depth <= 4) { 503 logo_new = kmalloc_array(logo->width, logo->height, 504 GFP_KERNEL); 505 if (logo_new == NULL) { 506 kfree(palette); 507 if (saved_pseudo_palette) 508 info->pseudo_palette = saved_pseudo_palette; 509 return 0; 510 } 511 image.data = logo_new; 512 fb_set_logo(info, logo, logo_new, fb_logo.depth); 513 } 514 515 if (fb_center_logo) { 516 int xres = info->var.xres; 517 int yres = info->var.yres; 518 519 if (rotate == FB_ROTATE_CW || rotate == FB_ROTATE_CCW) { 520 xres = info->var.yres; 521 yres = info->var.xres; 522 } 523 524 while (n && (n * (logo->width + 8) - 8 > xres)) 525 --n; 526 image.dx = (xres - n * (logo->width + 8) - 8) / 2; 527 image.dy = y ?: (yres - logo->height) / 2; 528 } else { 529 image.dx = 0; 530 image.dy = y; 531 } 532 533 image.width = logo->width; 534 image.height = logo->height; 535 536 if (rotate) { 537 logo_rotate = kmalloc_array(logo->width, logo->height, 538 GFP_KERNEL); 539 if (logo_rotate) 540 fb_rotate_logo(info, logo_rotate, &image, rotate); 541 } 542 543 fb_do_show_logo(info, &image, rotate, n); 544 545 kfree(palette); 546 if (saved_pseudo_palette != NULL) 547 info->pseudo_palette = saved_pseudo_palette; 548 kfree(logo_new); 549 kfree(logo_rotate); 550 return image.dy + logo->height; 551 } 552 553 554 #ifdef CONFIG_FB_LOGO_EXTRA 555 556 #define FB_LOGO_EX_NUM_MAX 10 557 static struct logo_data_extra { 558 const struct linux_logo *logo; 559 unsigned int n; 560 } fb_logo_ex[FB_LOGO_EX_NUM_MAX]; 561 static unsigned int fb_logo_ex_num; 562 563 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n) 564 { 565 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX) 566 return; 567 568 fb_logo_ex[fb_logo_ex_num].logo = logo; 569 fb_logo_ex[fb_logo_ex_num].n = n; 570 fb_logo_ex_num++; 571 } 572 573 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height, 574 unsigned int yres) 575 { 576 unsigned int i; 577 578 /* FIXME: logo_ex supports only truecolor fb. */ 579 if (info->fix.visual != FB_VISUAL_TRUECOLOR) 580 fb_logo_ex_num = 0; 581 582 for (i = 0; i < fb_logo_ex_num; i++) { 583 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) { 584 fb_logo_ex[i].logo = NULL; 585 continue; 586 } 587 height += fb_logo_ex[i].logo->height; 588 if (height > yres) { 589 height -= fb_logo_ex[i].logo->height; 590 fb_logo_ex_num = i; 591 break; 592 } 593 } 594 return height; 595 } 596 597 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate) 598 { 599 unsigned int i; 600 601 for (i = 0; i < fb_logo_ex_num; i++) 602 y = fb_show_logo_line(info, rotate, 603 fb_logo_ex[i].logo, y, fb_logo_ex[i].n); 604 605 return y; 606 } 607 608 #else /* !CONFIG_FB_LOGO_EXTRA */ 609 610 static inline int fb_prepare_extra_logos(struct fb_info *info, 611 unsigned int height, 612 unsigned int yres) 613 { 614 return height; 615 } 616 617 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate) 618 { 619 return y; 620 } 621 622 #endif /* CONFIG_FB_LOGO_EXTRA */ 623 624 625 int fb_prepare_logo(struct fb_info *info, int rotate) 626 { 627 int depth = fb_get_color_depth(&info->var, &info->fix); 628 unsigned int yres; 629 int height; 630 631 memset(&fb_logo, 0, sizeof(struct logo_data)); 632 633 if (info->flags & FBINFO_MISC_TILEBLITTING || 634 info->fbops->owner) 635 return 0; 636 637 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) { 638 depth = info->var.blue.length; 639 if (info->var.red.length < depth) 640 depth = info->var.red.length; 641 if (info->var.green.length < depth) 642 depth = info->var.green.length; 643 } 644 645 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) { 646 /* assume console colormap */ 647 depth = 4; 648 } 649 650 /* Return if no suitable logo was found */ 651 fb_logo.logo = fb_find_logo(depth); 652 653 if (!fb_logo.logo) { 654 return 0; 655 } 656 657 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD) 658 yres = info->var.yres; 659 else 660 yres = info->var.xres; 661 662 if (fb_logo.logo->height > yres) { 663 fb_logo.logo = NULL; 664 return 0; 665 } 666 667 /* What depth we asked for might be different from what we get */ 668 if (fb_logo.logo->type == LINUX_LOGO_CLUT224) 669 fb_logo.depth = 8; 670 else if (fb_logo.logo->type == LINUX_LOGO_VGA16) 671 fb_logo.depth = 4; 672 else 673 fb_logo.depth = 1; 674 675 676 if (fb_logo.depth > 4 && depth > 4) { 677 switch (info->fix.visual) { 678 case FB_VISUAL_TRUECOLOR: 679 fb_logo.needs_truepalette = 1; 680 break; 681 case FB_VISUAL_DIRECTCOLOR: 682 fb_logo.needs_directpalette = 1; 683 fb_logo.needs_cmapreset = 1; 684 break; 685 case FB_VISUAL_PSEUDOCOLOR: 686 fb_logo.needs_cmapreset = 1; 687 break; 688 } 689 } 690 691 height = fb_logo.logo->height; 692 if (fb_center_logo) 693 height += (yres - fb_logo.logo->height) / 2; 694 695 return fb_prepare_extra_logos(info, height, yres); 696 } 697 698 int fb_show_logo(struct fb_info *info, int rotate) 699 { 700 int y; 701 702 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0, 703 num_online_cpus()); 704 y = fb_show_extra_logos(info, y, rotate); 705 706 return y; 707 } 708 #else 709 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; } 710 int fb_show_logo(struct fb_info *info, int rotate) { return 0; } 711 #endif /* CONFIG_LOGO */ 712 EXPORT_SYMBOL(fb_prepare_logo); 713 EXPORT_SYMBOL(fb_show_logo); 714 715 static void *fb_seq_start(struct seq_file *m, loff_t *pos) 716 { 717 mutex_lock(®istration_lock); 718 return (*pos < FB_MAX) ? pos : NULL; 719 } 720 721 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos) 722 { 723 (*pos)++; 724 return (*pos < FB_MAX) ? pos : NULL; 725 } 726 727 static void fb_seq_stop(struct seq_file *m, void *v) 728 { 729 mutex_unlock(®istration_lock); 730 } 731 732 static int fb_seq_show(struct seq_file *m, void *v) 733 { 734 int i = *(loff_t *)v; 735 struct fb_info *fi = registered_fb[i]; 736 737 if (fi) 738 seq_printf(m, "%d %s\n", fi->node, fi->fix.id); 739 return 0; 740 } 741 742 static const struct seq_operations proc_fb_seq_ops = { 743 .start = fb_seq_start, 744 .next = fb_seq_next, 745 .stop = fb_seq_stop, 746 .show = fb_seq_show, 747 }; 748 749 /* 750 * We hold a reference to the fb_info in file->private_data, 751 * but if the current registered fb has changed, we don't 752 * actually want to use it. 753 * 754 * So look up the fb_info using the inode minor number, 755 * and just verify it against the reference we have. 756 */ 757 static struct fb_info *file_fb_info(struct file *file) 758 { 759 struct inode *inode = file_inode(file); 760 int fbidx = iminor(inode); 761 struct fb_info *info = registered_fb[fbidx]; 762 763 if (info != file->private_data) 764 info = NULL; 765 return info; 766 } 767 768 static ssize_t 769 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) 770 { 771 unsigned long p = *ppos; 772 struct fb_info *info = file_fb_info(file); 773 u8 *buffer, *dst; 774 u8 __iomem *src; 775 int c, cnt = 0, err = 0; 776 unsigned long total_size; 777 778 if (!info || ! info->screen_base) 779 return -ENODEV; 780 781 if (info->state != FBINFO_STATE_RUNNING) 782 return -EPERM; 783 784 if (info->fbops->fb_read) 785 return info->fbops->fb_read(info, buf, count, ppos); 786 787 total_size = info->screen_size; 788 789 if (total_size == 0) 790 total_size = info->fix.smem_len; 791 792 if (p >= total_size) 793 return 0; 794 795 if (count >= total_size) 796 count = total_size; 797 798 if (count + p > total_size) 799 count = total_size - p; 800 801 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, 802 GFP_KERNEL); 803 if (!buffer) 804 return -ENOMEM; 805 806 src = (u8 __iomem *) (info->screen_base + p); 807 808 if (info->fbops->fb_sync) 809 info->fbops->fb_sync(info); 810 811 while (count) { 812 c = (count > PAGE_SIZE) ? PAGE_SIZE : count; 813 dst = buffer; 814 fb_memcpy_fromfb(dst, src, c); 815 dst += c; 816 src += c; 817 818 if (copy_to_user(buf, buffer, c)) { 819 err = -EFAULT; 820 break; 821 } 822 *ppos += c; 823 buf += c; 824 cnt += c; 825 count -= c; 826 } 827 828 kfree(buffer); 829 830 return (err) ? err : cnt; 831 } 832 833 static ssize_t 834 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) 835 { 836 unsigned long p = *ppos; 837 struct fb_info *info = file_fb_info(file); 838 u8 *buffer, *src; 839 u8 __iomem *dst; 840 int c, cnt = 0, err = 0; 841 unsigned long total_size; 842 843 if (!info || !info->screen_base) 844 return -ENODEV; 845 846 if (info->state != FBINFO_STATE_RUNNING) 847 return -EPERM; 848 849 if (info->fbops->fb_write) 850 return info->fbops->fb_write(info, buf, count, ppos); 851 852 total_size = info->screen_size; 853 854 if (total_size == 0) 855 total_size = info->fix.smem_len; 856 857 if (p > total_size) 858 return -EFBIG; 859 860 if (count > total_size) { 861 err = -EFBIG; 862 count = total_size; 863 } 864 865 if (count + p > total_size) { 866 if (!err) 867 err = -ENOSPC; 868 869 count = total_size - p; 870 } 871 872 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, 873 GFP_KERNEL); 874 if (!buffer) 875 return -ENOMEM; 876 877 dst = (u8 __iomem *) (info->screen_base + p); 878 879 if (info->fbops->fb_sync) 880 info->fbops->fb_sync(info); 881 882 while (count) { 883 c = (count > PAGE_SIZE) ? PAGE_SIZE : count; 884 src = buffer; 885 886 if (copy_from_user(src, buf, c)) { 887 err = -EFAULT; 888 break; 889 } 890 891 fb_memcpy_tofb(dst, src, c); 892 dst += c; 893 src += c; 894 *ppos += c; 895 buf += c; 896 cnt += c; 897 count -= c; 898 } 899 900 kfree(buffer); 901 902 return (cnt) ? cnt : err; 903 } 904 905 int 906 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var) 907 { 908 struct fb_fix_screeninfo *fix = &info->fix; 909 unsigned int yres = info->var.yres; 910 int err = 0; 911 912 if (var->yoffset > 0) { 913 if (var->vmode & FB_VMODE_YWRAP) { 914 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep)) 915 err = -EINVAL; 916 else 917 yres = 0; 918 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep)) 919 err = -EINVAL; 920 } 921 922 if (var->xoffset > 0 && (!fix->xpanstep || 923 (var->xoffset % fix->xpanstep))) 924 err = -EINVAL; 925 926 if (err || !info->fbops->fb_pan_display || 927 var->yoffset > info->var.yres_virtual - yres || 928 var->xoffset > info->var.xres_virtual - info->var.xres) 929 return -EINVAL; 930 931 if ((err = info->fbops->fb_pan_display(var, info))) 932 return err; 933 info->var.xoffset = var->xoffset; 934 info->var.yoffset = var->yoffset; 935 if (var->vmode & FB_VMODE_YWRAP) 936 info->var.vmode |= FB_VMODE_YWRAP; 937 else 938 info->var.vmode &= ~FB_VMODE_YWRAP; 939 return 0; 940 } 941 EXPORT_SYMBOL(fb_pan_display); 942 943 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var, 944 u32 activate) 945 { 946 struct fb_event event; 947 struct fb_blit_caps caps, fbcaps; 948 int err = 0; 949 950 memset(&caps, 0, sizeof(caps)); 951 memset(&fbcaps, 0, sizeof(fbcaps)); 952 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0; 953 event.info = info; 954 event.data = ∩︀ 955 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event); 956 info->fbops->fb_get_caps(info, &fbcaps, var); 957 958 if (((fbcaps.x ^ caps.x) & caps.x) || 959 ((fbcaps.y ^ caps.y) & caps.y) || 960 (fbcaps.len < caps.len)) 961 err = -EINVAL; 962 963 return err; 964 } 965 966 int 967 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var) 968 { 969 int flags = info->flags; 970 int ret = 0; 971 972 if (var->activate & FB_ACTIVATE_INV_MODE) { 973 struct fb_videomode mode1, mode2; 974 975 fb_var_to_videomode(&mode1, var); 976 fb_var_to_videomode(&mode2, &info->var); 977 /* make sure we don't delete the videomode of current var */ 978 ret = fb_mode_is_equal(&mode1, &mode2); 979 980 if (!ret) { 981 struct fb_event event; 982 983 event.info = info; 984 event.data = &mode1; 985 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event); 986 } 987 988 if (!ret) 989 fb_delete_videomode(&mode1, &info->modelist); 990 991 992 ret = (ret) ? -EINVAL : 0; 993 goto done; 994 } 995 996 if ((var->activate & FB_ACTIVATE_FORCE) || 997 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) { 998 u32 activate = var->activate; 999 1000 /* When using FOURCC mode, make sure the red, green, blue and 1001 * transp fields are set to 0. 1002 */ 1003 if ((info->fix.capabilities & FB_CAP_FOURCC) && 1004 var->grayscale > 1) { 1005 if (var->red.offset || var->green.offset || 1006 var->blue.offset || var->transp.offset || 1007 var->red.length || var->green.length || 1008 var->blue.length || var->transp.length || 1009 var->red.msb_right || var->green.msb_right || 1010 var->blue.msb_right || var->transp.msb_right) 1011 return -EINVAL; 1012 } 1013 1014 if (!info->fbops->fb_check_var) { 1015 *var = info->var; 1016 goto done; 1017 } 1018 1019 ret = info->fbops->fb_check_var(var, info); 1020 1021 if (ret) 1022 goto done; 1023 1024 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) { 1025 struct fb_var_screeninfo old_var; 1026 struct fb_videomode mode; 1027 1028 if (info->fbops->fb_get_caps) { 1029 ret = fb_check_caps(info, var, activate); 1030 1031 if (ret) 1032 goto done; 1033 } 1034 1035 old_var = info->var; 1036 info->var = *var; 1037 1038 if (info->fbops->fb_set_par) { 1039 ret = info->fbops->fb_set_par(info); 1040 1041 if (ret) { 1042 info->var = old_var; 1043 printk(KERN_WARNING "detected " 1044 "fb_set_par error, " 1045 "error code: %d\n", ret); 1046 goto done; 1047 } 1048 } 1049 1050 fb_pan_display(info, &info->var); 1051 fb_set_cmap(&info->cmap, info); 1052 fb_var_to_videomode(&mode, &info->var); 1053 1054 if (info->modelist.prev && info->modelist.next && 1055 !list_empty(&info->modelist)) 1056 ret = fb_add_videomode(&mode, &info->modelist); 1057 1058 if (!ret && (flags & FBINFO_MISC_USEREVENT)) { 1059 struct fb_event event; 1060 int evnt = (activate & FB_ACTIVATE_ALL) ? 1061 FB_EVENT_MODE_CHANGE_ALL : 1062 FB_EVENT_MODE_CHANGE; 1063 1064 info->flags &= ~FBINFO_MISC_USEREVENT; 1065 event.info = info; 1066 event.data = &mode; 1067 fb_notifier_call_chain(evnt, &event); 1068 } 1069 } 1070 } 1071 1072 done: 1073 return ret; 1074 } 1075 EXPORT_SYMBOL(fb_set_var); 1076 1077 int 1078 fb_blank(struct fb_info *info, int blank) 1079 { 1080 struct fb_event event; 1081 int ret = -EINVAL, early_ret; 1082 1083 if (blank > FB_BLANK_POWERDOWN) 1084 blank = FB_BLANK_POWERDOWN; 1085 1086 event.info = info; 1087 event.data = ␣ 1088 1089 early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event); 1090 1091 if (info->fbops->fb_blank) 1092 ret = info->fbops->fb_blank(blank, info); 1093 1094 if (!ret) 1095 fb_notifier_call_chain(FB_EVENT_BLANK, &event); 1096 else { 1097 /* 1098 * if fb_blank is failed then revert effects of 1099 * the early blank event. 1100 */ 1101 if (!early_ret) 1102 fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event); 1103 } 1104 1105 return ret; 1106 } 1107 EXPORT_SYMBOL(fb_blank); 1108 1109 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd, 1110 unsigned long arg) 1111 { 1112 struct fb_ops *fb; 1113 struct fb_var_screeninfo var; 1114 struct fb_fix_screeninfo fix; 1115 struct fb_con2fbmap con2fb; 1116 struct fb_cmap cmap_from; 1117 struct fb_cmap_user cmap; 1118 struct fb_event event; 1119 void __user *argp = (void __user *)arg; 1120 long ret = 0; 1121 1122 switch (cmd) { 1123 case FBIOGET_VSCREENINFO: 1124 if (!lock_fb_info(info)) 1125 return -ENODEV; 1126 var = info->var; 1127 unlock_fb_info(info); 1128 1129 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0; 1130 break; 1131 case FBIOPUT_VSCREENINFO: 1132 if (copy_from_user(&var, argp, sizeof(var))) 1133 return -EFAULT; 1134 console_lock(); 1135 if (!lock_fb_info(info)) { 1136 console_unlock(); 1137 return -ENODEV; 1138 } 1139 info->flags |= FBINFO_MISC_USEREVENT; 1140 ret = fb_set_var(info, &var); 1141 info->flags &= ~FBINFO_MISC_USEREVENT; 1142 unlock_fb_info(info); 1143 console_unlock(); 1144 if (!ret && copy_to_user(argp, &var, sizeof(var))) 1145 ret = -EFAULT; 1146 break; 1147 case FBIOGET_FSCREENINFO: 1148 if (!lock_fb_info(info)) 1149 return -ENODEV; 1150 fix = info->fix; 1151 if (info->flags & FBINFO_HIDE_SMEM_START) 1152 fix.smem_start = 0; 1153 unlock_fb_info(info); 1154 1155 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0; 1156 break; 1157 case FBIOPUTCMAP: 1158 if (copy_from_user(&cmap, argp, sizeof(cmap))) 1159 return -EFAULT; 1160 ret = fb_set_user_cmap(&cmap, info); 1161 break; 1162 case FBIOGETCMAP: 1163 if (copy_from_user(&cmap, argp, sizeof(cmap))) 1164 return -EFAULT; 1165 if (!lock_fb_info(info)) 1166 return -ENODEV; 1167 cmap_from = info->cmap; 1168 unlock_fb_info(info); 1169 ret = fb_cmap_to_user(&cmap_from, &cmap); 1170 break; 1171 case FBIOPAN_DISPLAY: 1172 if (copy_from_user(&var, argp, sizeof(var))) 1173 return -EFAULT; 1174 console_lock(); 1175 if (!lock_fb_info(info)) { 1176 console_unlock(); 1177 return -ENODEV; 1178 } 1179 ret = fb_pan_display(info, &var); 1180 unlock_fb_info(info); 1181 console_unlock(); 1182 if (ret == 0 && copy_to_user(argp, &var, sizeof(var))) 1183 return -EFAULT; 1184 break; 1185 case FBIO_CURSOR: 1186 ret = -EINVAL; 1187 break; 1188 case FBIOGET_CON2FBMAP: 1189 if (copy_from_user(&con2fb, argp, sizeof(con2fb))) 1190 return -EFAULT; 1191 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES) 1192 return -EINVAL; 1193 con2fb.framebuffer = -1; 1194 event.data = &con2fb; 1195 if (!lock_fb_info(info)) 1196 return -ENODEV; 1197 event.info = info; 1198 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event); 1199 unlock_fb_info(info); 1200 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0; 1201 break; 1202 case FBIOPUT_CON2FBMAP: 1203 if (copy_from_user(&con2fb, argp, sizeof(con2fb))) 1204 return -EFAULT; 1205 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES) 1206 return -EINVAL; 1207 if (con2fb.framebuffer >= FB_MAX) 1208 return -EINVAL; 1209 if (!registered_fb[con2fb.framebuffer]) 1210 request_module("fb%d", con2fb.framebuffer); 1211 if (!registered_fb[con2fb.framebuffer]) { 1212 ret = -EINVAL; 1213 break; 1214 } 1215 event.data = &con2fb; 1216 console_lock(); 1217 if (!lock_fb_info(info)) { 1218 console_unlock(); 1219 return -ENODEV; 1220 } 1221 event.info = info; 1222 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event); 1223 unlock_fb_info(info); 1224 console_unlock(); 1225 break; 1226 case FBIOBLANK: 1227 console_lock(); 1228 if (!lock_fb_info(info)) { 1229 console_unlock(); 1230 return -ENODEV; 1231 } 1232 info->flags |= FBINFO_MISC_USEREVENT; 1233 ret = fb_blank(info, arg); 1234 info->flags &= ~FBINFO_MISC_USEREVENT; 1235 unlock_fb_info(info); 1236 console_unlock(); 1237 break; 1238 default: 1239 if (!lock_fb_info(info)) 1240 return -ENODEV; 1241 fb = info->fbops; 1242 if (fb->fb_ioctl) 1243 ret = fb->fb_ioctl(info, cmd, arg); 1244 else 1245 ret = -ENOTTY; 1246 unlock_fb_info(info); 1247 } 1248 return ret; 1249 } 1250 1251 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1252 { 1253 struct fb_info *info = file_fb_info(file); 1254 1255 if (!info) 1256 return -ENODEV; 1257 return do_fb_ioctl(info, cmd, arg); 1258 } 1259 1260 #ifdef CONFIG_COMPAT 1261 struct fb_fix_screeninfo32 { 1262 char id[16]; 1263 compat_caddr_t smem_start; 1264 u32 smem_len; 1265 u32 type; 1266 u32 type_aux; 1267 u32 visual; 1268 u16 xpanstep; 1269 u16 ypanstep; 1270 u16 ywrapstep; 1271 u32 line_length; 1272 compat_caddr_t mmio_start; 1273 u32 mmio_len; 1274 u32 accel; 1275 u16 reserved[3]; 1276 }; 1277 1278 struct fb_cmap32 { 1279 u32 start; 1280 u32 len; 1281 compat_caddr_t red; 1282 compat_caddr_t green; 1283 compat_caddr_t blue; 1284 compat_caddr_t transp; 1285 }; 1286 1287 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd, 1288 unsigned long arg) 1289 { 1290 struct fb_cmap_user __user *cmap; 1291 struct fb_cmap32 __user *cmap32; 1292 __u32 data; 1293 int err; 1294 1295 cmap = compat_alloc_user_space(sizeof(*cmap)); 1296 cmap32 = compat_ptr(arg); 1297 1298 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32))) 1299 return -EFAULT; 1300 1301 if (get_user(data, &cmap32->red) || 1302 put_user(compat_ptr(data), &cmap->red) || 1303 get_user(data, &cmap32->green) || 1304 put_user(compat_ptr(data), &cmap->green) || 1305 get_user(data, &cmap32->blue) || 1306 put_user(compat_ptr(data), &cmap->blue) || 1307 get_user(data, &cmap32->transp) || 1308 put_user(compat_ptr(data), &cmap->transp)) 1309 return -EFAULT; 1310 1311 err = do_fb_ioctl(info, cmd, (unsigned long) cmap); 1312 1313 if (!err) { 1314 if (copy_in_user(&cmap32->start, 1315 &cmap->start, 1316 2 * sizeof(__u32))) 1317 err = -EFAULT; 1318 } 1319 return err; 1320 } 1321 1322 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix, 1323 struct fb_fix_screeninfo32 __user *fix32) 1324 { 1325 __u32 data; 1326 int err; 1327 1328 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id)); 1329 1330 data = (__u32) (unsigned long) fix->smem_start; 1331 err |= put_user(data, &fix32->smem_start); 1332 1333 err |= put_user(fix->smem_len, &fix32->smem_len); 1334 err |= put_user(fix->type, &fix32->type); 1335 err |= put_user(fix->type_aux, &fix32->type_aux); 1336 err |= put_user(fix->visual, &fix32->visual); 1337 err |= put_user(fix->xpanstep, &fix32->xpanstep); 1338 err |= put_user(fix->ypanstep, &fix32->ypanstep); 1339 err |= put_user(fix->ywrapstep, &fix32->ywrapstep); 1340 err |= put_user(fix->line_length, &fix32->line_length); 1341 1342 data = (__u32) (unsigned long) fix->mmio_start; 1343 err |= put_user(data, &fix32->mmio_start); 1344 1345 err |= put_user(fix->mmio_len, &fix32->mmio_len); 1346 err |= put_user(fix->accel, &fix32->accel); 1347 err |= copy_to_user(fix32->reserved, fix->reserved, 1348 sizeof(fix->reserved)); 1349 1350 if (err) 1351 return -EFAULT; 1352 return 0; 1353 } 1354 1355 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd, 1356 unsigned long arg) 1357 { 1358 struct fb_fix_screeninfo fix; 1359 1360 if (!lock_fb_info(info)) 1361 return -ENODEV; 1362 fix = info->fix; 1363 if (info->flags & FBINFO_HIDE_SMEM_START) 1364 fix.smem_start = 0; 1365 unlock_fb_info(info); 1366 return do_fscreeninfo_to_user(&fix, compat_ptr(arg)); 1367 } 1368 1369 static long fb_compat_ioctl(struct file *file, unsigned int cmd, 1370 unsigned long arg) 1371 { 1372 struct fb_info *info = file_fb_info(file); 1373 struct fb_ops *fb; 1374 long ret = -ENOIOCTLCMD; 1375 1376 if (!info) 1377 return -ENODEV; 1378 fb = info->fbops; 1379 switch(cmd) { 1380 case FBIOGET_VSCREENINFO: 1381 case FBIOPUT_VSCREENINFO: 1382 case FBIOPAN_DISPLAY: 1383 case FBIOGET_CON2FBMAP: 1384 case FBIOPUT_CON2FBMAP: 1385 arg = (unsigned long) compat_ptr(arg); 1386 /* fall through */ 1387 case FBIOBLANK: 1388 ret = do_fb_ioctl(info, cmd, arg); 1389 break; 1390 1391 case FBIOGET_FSCREENINFO: 1392 ret = fb_get_fscreeninfo(info, cmd, arg); 1393 break; 1394 1395 case FBIOGETCMAP: 1396 case FBIOPUTCMAP: 1397 ret = fb_getput_cmap(info, cmd, arg); 1398 break; 1399 1400 default: 1401 if (fb->fb_compat_ioctl) 1402 ret = fb->fb_compat_ioctl(info, cmd, arg); 1403 break; 1404 } 1405 return ret; 1406 } 1407 #endif 1408 1409 static int 1410 fb_mmap(struct file *file, struct vm_area_struct * vma) 1411 { 1412 struct fb_info *info = file_fb_info(file); 1413 struct fb_ops *fb; 1414 unsigned long mmio_pgoff; 1415 unsigned long start; 1416 u32 len; 1417 1418 if (!info) 1419 return -ENODEV; 1420 fb = info->fbops; 1421 if (!fb) 1422 return -ENODEV; 1423 mutex_lock(&info->mm_lock); 1424 if (fb->fb_mmap) { 1425 int res; 1426 1427 /* 1428 * The framebuffer needs to be accessed decrypted, be sure 1429 * SME protection is removed ahead of the call 1430 */ 1431 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); 1432 res = fb->fb_mmap(info, vma); 1433 mutex_unlock(&info->mm_lock); 1434 return res; 1435 } 1436 1437 /* 1438 * Ugh. This can be either the frame buffer mapping, or 1439 * if pgoff points past it, the mmio mapping. 1440 */ 1441 start = info->fix.smem_start; 1442 len = info->fix.smem_len; 1443 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT; 1444 if (vma->vm_pgoff >= mmio_pgoff) { 1445 if (info->var.accel_flags) { 1446 mutex_unlock(&info->mm_lock); 1447 return -EINVAL; 1448 } 1449 1450 vma->vm_pgoff -= mmio_pgoff; 1451 start = info->fix.mmio_start; 1452 len = info->fix.mmio_len; 1453 } 1454 mutex_unlock(&info->mm_lock); 1455 1456 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); 1457 /* 1458 * The framebuffer needs to be accessed decrypted, be sure 1459 * SME protection is removed 1460 */ 1461 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); 1462 fb_pgprotect(file, vma, start); 1463 1464 return vm_iomap_memory(vma, start, len); 1465 } 1466 1467 static int 1468 fb_open(struct inode *inode, struct file *file) 1469 __acquires(&info->lock) 1470 __releases(&info->lock) 1471 { 1472 int fbidx = iminor(inode); 1473 struct fb_info *info; 1474 int res = 0; 1475 1476 info = get_fb_info(fbidx); 1477 if (!info) { 1478 request_module("fb%d", fbidx); 1479 info = get_fb_info(fbidx); 1480 if (!info) 1481 return -ENODEV; 1482 } 1483 if (IS_ERR(info)) 1484 return PTR_ERR(info); 1485 1486 mutex_lock(&info->lock); 1487 if (!try_module_get(info->fbops->owner)) { 1488 res = -ENODEV; 1489 goto out; 1490 } 1491 file->private_data = info; 1492 if (info->fbops->fb_open) { 1493 res = info->fbops->fb_open(info,1); 1494 if (res) 1495 module_put(info->fbops->owner); 1496 } 1497 #ifdef CONFIG_FB_DEFERRED_IO 1498 if (info->fbdefio) 1499 fb_deferred_io_open(info, inode, file); 1500 #endif 1501 out: 1502 mutex_unlock(&info->lock); 1503 if (res) 1504 put_fb_info(info); 1505 return res; 1506 } 1507 1508 static int 1509 fb_release(struct inode *inode, struct file *file) 1510 __acquires(&info->lock) 1511 __releases(&info->lock) 1512 { 1513 struct fb_info * const info = file->private_data; 1514 1515 mutex_lock(&info->lock); 1516 if (info->fbops->fb_release) 1517 info->fbops->fb_release(info,1); 1518 module_put(info->fbops->owner); 1519 mutex_unlock(&info->lock); 1520 put_fb_info(info); 1521 return 0; 1522 } 1523 1524 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU) 1525 unsigned long get_fb_unmapped_area(struct file *filp, 1526 unsigned long addr, unsigned long len, 1527 unsigned long pgoff, unsigned long flags) 1528 { 1529 struct fb_info * const info = filp->private_data; 1530 unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len); 1531 1532 if (pgoff > fb_size || len > fb_size - pgoff) 1533 return -EINVAL; 1534 1535 return (unsigned long)info->screen_base + pgoff; 1536 } 1537 #endif 1538 1539 static const struct file_operations fb_fops = { 1540 .owner = THIS_MODULE, 1541 .read = fb_read, 1542 .write = fb_write, 1543 .unlocked_ioctl = fb_ioctl, 1544 #ifdef CONFIG_COMPAT 1545 .compat_ioctl = fb_compat_ioctl, 1546 #endif 1547 .mmap = fb_mmap, 1548 .open = fb_open, 1549 .release = fb_release, 1550 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \ 1551 (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \ 1552 !defined(CONFIG_MMU)) 1553 .get_unmapped_area = get_fb_unmapped_area, 1554 #endif 1555 #ifdef CONFIG_FB_DEFERRED_IO 1556 .fsync = fb_deferred_io_fsync, 1557 #endif 1558 .llseek = default_llseek, 1559 }; 1560 1561 struct class *fb_class; 1562 EXPORT_SYMBOL(fb_class); 1563 1564 static int fb_check_foreignness(struct fb_info *fi) 1565 { 1566 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN; 1567 1568 fi->flags &= ~FBINFO_FOREIGN_ENDIAN; 1569 1570 #ifdef __BIG_ENDIAN 1571 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH; 1572 #else 1573 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0; 1574 #endif /* __BIG_ENDIAN */ 1575 1576 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) { 1577 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to " 1578 "support this framebuffer\n", fi->fix.id); 1579 return -ENOSYS; 1580 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) { 1581 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to " 1582 "support this framebuffer\n", fi->fix.id); 1583 return -ENOSYS; 1584 } 1585 1586 return 0; 1587 } 1588 1589 static bool apertures_overlap(struct aperture *gen, struct aperture *hw) 1590 { 1591 /* is the generic aperture base the same as the HW one */ 1592 if (gen->base == hw->base) 1593 return true; 1594 /* is the generic aperture base inside the hw base->hw base+size */ 1595 if (gen->base > hw->base && gen->base < hw->base + hw->size) 1596 return true; 1597 return false; 1598 } 1599 1600 static bool fb_do_apertures_overlap(struct apertures_struct *gena, 1601 struct apertures_struct *hwa) 1602 { 1603 int i, j; 1604 if (!hwa || !gena) 1605 return false; 1606 1607 for (i = 0; i < hwa->count; ++i) { 1608 struct aperture *h = &hwa->ranges[i]; 1609 for (j = 0; j < gena->count; ++j) { 1610 struct aperture *g = &gena->ranges[j]; 1611 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n", 1612 (unsigned long long)g->base, 1613 (unsigned long long)g->size, 1614 (unsigned long long)h->base, 1615 (unsigned long long)h->size); 1616 if (apertures_overlap(g, h)) 1617 return true; 1618 } 1619 } 1620 1621 return false; 1622 } 1623 1624 static int do_unregister_framebuffer(struct fb_info *fb_info); 1625 1626 #define VGA_FB_PHYS 0xA0000 1627 static int do_remove_conflicting_framebuffers(struct apertures_struct *a, 1628 const char *name, bool primary) 1629 { 1630 int i, ret; 1631 1632 /* check all firmware fbs and kick off if the base addr overlaps */ 1633 for_each_registered_fb(i) { 1634 struct apertures_struct *gen_aper; 1635 1636 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE)) 1637 continue; 1638 1639 gen_aper = registered_fb[i]->apertures; 1640 if (fb_do_apertures_overlap(gen_aper, a) || 1641 (primary && gen_aper && gen_aper->count && 1642 gen_aper->ranges[0].base == VGA_FB_PHYS)) { 1643 1644 printk(KERN_INFO "fb%d: switching to %s from %s\n", 1645 i, name, registered_fb[i]->fix.id); 1646 ret = do_unregister_framebuffer(registered_fb[i]); 1647 if (ret) 1648 return ret; 1649 } 1650 } 1651 1652 return 0; 1653 } 1654 1655 static bool lockless_register_fb; 1656 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400); 1657 MODULE_PARM_DESC(lockless_register_fb, 1658 "Lockless framebuffer registration for debugging [default=off]"); 1659 1660 static int do_register_framebuffer(struct fb_info *fb_info) 1661 { 1662 int i, ret; 1663 struct fb_event event; 1664 struct fb_videomode mode; 1665 1666 if (fb_check_foreignness(fb_info)) 1667 return -ENOSYS; 1668 1669 ret = do_remove_conflicting_framebuffers(fb_info->apertures, 1670 fb_info->fix.id, 1671 fb_is_primary_device(fb_info)); 1672 if (ret) 1673 return ret; 1674 1675 if (num_registered_fb == FB_MAX) 1676 return -ENXIO; 1677 1678 num_registered_fb++; 1679 for (i = 0 ; i < FB_MAX; i++) 1680 if (!registered_fb[i]) 1681 break; 1682 fb_info->node = i; 1683 atomic_set(&fb_info->count, 1); 1684 mutex_init(&fb_info->lock); 1685 mutex_init(&fb_info->mm_lock); 1686 1687 fb_info->dev = device_create(fb_class, fb_info->device, 1688 MKDEV(FB_MAJOR, i), NULL, "fb%d", i); 1689 if (IS_ERR(fb_info->dev)) { 1690 /* Not fatal */ 1691 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev)); 1692 fb_info->dev = NULL; 1693 } else 1694 fb_init_device(fb_info); 1695 1696 if (fb_info->pixmap.addr == NULL) { 1697 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL); 1698 if (fb_info->pixmap.addr) { 1699 fb_info->pixmap.size = FBPIXMAPSIZE; 1700 fb_info->pixmap.buf_align = 1; 1701 fb_info->pixmap.scan_align = 1; 1702 fb_info->pixmap.access_align = 32; 1703 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT; 1704 } 1705 } 1706 fb_info->pixmap.offset = 0; 1707 1708 if (!fb_info->pixmap.blit_x) 1709 fb_info->pixmap.blit_x = ~(u32)0; 1710 1711 if (!fb_info->pixmap.blit_y) 1712 fb_info->pixmap.blit_y = ~(u32)0; 1713 1714 if (!fb_info->modelist.prev || !fb_info->modelist.next) 1715 INIT_LIST_HEAD(&fb_info->modelist); 1716 1717 if (fb_info->skip_vt_switch) 1718 pm_vt_switch_required(fb_info->dev, false); 1719 else 1720 pm_vt_switch_required(fb_info->dev, true); 1721 1722 fb_var_to_videomode(&mode, &fb_info->var); 1723 fb_add_videomode(&mode, &fb_info->modelist); 1724 registered_fb[i] = fb_info; 1725 1726 event.info = fb_info; 1727 if (!lockless_register_fb) 1728 console_lock(); 1729 else 1730 atomic_inc(&ignore_console_lock_warning); 1731 if (!lock_fb_info(fb_info)) { 1732 ret = -ENODEV; 1733 goto unlock_console; 1734 } 1735 ret = 0; 1736 1737 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event); 1738 unlock_fb_info(fb_info); 1739 unlock_console: 1740 if (!lockless_register_fb) 1741 console_unlock(); 1742 else 1743 atomic_dec(&ignore_console_lock_warning); 1744 return ret; 1745 } 1746 1747 static int unbind_console(struct fb_info *fb_info) 1748 { 1749 struct fb_event event; 1750 int ret; 1751 int i = fb_info->node; 1752 1753 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info) 1754 return -EINVAL; 1755 1756 console_lock(); 1757 if (!lock_fb_info(fb_info)) { 1758 console_unlock(); 1759 return -ENODEV; 1760 } 1761 1762 event.info = fb_info; 1763 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event); 1764 unlock_fb_info(fb_info); 1765 console_unlock(); 1766 1767 return ret; 1768 } 1769 1770 static int __unlink_framebuffer(struct fb_info *fb_info); 1771 1772 static int do_unregister_framebuffer(struct fb_info *fb_info) 1773 { 1774 struct fb_event event; 1775 int ret; 1776 1777 ret = unbind_console(fb_info); 1778 1779 if (ret) 1780 return -EINVAL; 1781 1782 pm_vt_switch_unregister(fb_info->dev); 1783 1784 __unlink_framebuffer(fb_info); 1785 if (fb_info->pixmap.addr && 1786 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) 1787 kfree(fb_info->pixmap.addr); 1788 fb_destroy_modelist(&fb_info->modelist); 1789 registered_fb[fb_info->node] = NULL; 1790 num_registered_fb--; 1791 fb_cleanup_device(fb_info); 1792 event.info = fb_info; 1793 console_lock(); 1794 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event); 1795 console_unlock(); 1796 1797 /* this may free fb info */ 1798 put_fb_info(fb_info); 1799 return 0; 1800 } 1801 1802 static int __unlink_framebuffer(struct fb_info *fb_info) 1803 { 1804 int i; 1805 1806 i = fb_info->node; 1807 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info) 1808 return -EINVAL; 1809 1810 if (fb_info->dev) { 1811 device_destroy(fb_class, MKDEV(FB_MAJOR, i)); 1812 fb_info->dev = NULL; 1813 } 1814 1815 return 0; 1816 } 1817 1818 int unlink_framebuffer(struct fb_info *fb_info) 1819 { 1820 int ret; 1821 1822 ret = __unlink_framebuffer(fb_info); 1823 if (ret) 1824 return ret; 1825 1826 unbind_console(fb_info); 1827 1828 return 0; 1829 } 1830 EXPORT_SYMBOL(unlink_framebuffer); 1831 1832 /** 1833 * remove_conflicting_framebuffers - remove firmware-configured framebuffers 1834 * @a: memory range, users of which are to be removed 1835 * @name: requesting driver name 1836 * @primary: also kick vga16fb if present 1837 * 1838 * This function removes framebuffer devices (initialized by firmware/bootloader) 1839 * which use memory range described by @a. If @a is NULL all such devices are 1840 * removed. 1841 */ 1842 int remove_conflicting_framebuffers(struct apertures_struct *a, 1843 const char *name, bool primary) 1844 { 1845 int ret; 1846 bool do_free = false; 1847 1848 if (!a) { 1849 a = alloc_apertures(1); 1850 if (!a) 1851 return -ENOMEM; 1852 1853 a->ranges[0].base = 0; 1854 a->ranges[0].size = ~0; 1855 do_free = true; 1856 } 1857 1858 mutex_lock(®istration_lock); 1859 ret = do_remove_conflicting_framebuffers(a, name, primary); 1860 mutex_unlock(®istration_lock); 1861 1862 if (do_free) 1863 kfree(a); 1864 1865 return ret; 1866 } 1867 EXPORT_SYMBOL(remove_conflicting_framebuffers); 1868 1869 /** 1870 * remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices 1871 * @pdev: PCI device 1872 * @res_id: index of PCI BAR configuring framebuffer memory 1873 * @name: requesting driver name 1874 * 1875 * This function removes framebuffer devices (eg. initialized by firmware) 1876 * using memory range configured for @pdev's BAR @res_id. 1877 * 1878 * The function assumes that PCI device with shadowed ROM drives a primary 1879 * display and so kicks out vga16fb. 1880 */ 1881 int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, int res_id, const char *name) 1882 { 1883 struct apertures_struct *ap; 1884 bool primary = false; 1885 int err, idx, bar; 1886 bool res_id_found = false; 1887 1888 for (idx = 0, bar = 0; bar < PCI_ROM_RESOURCE; bar++) { 1889 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) 1890 continue; 1891 idx++; 1892 } 1893 1894 ap = alloc_apertures(idx); 1895 if (!ap) 1896 return -ENOMEM; 1897 1898 for (idx = 0, bar = 0; bar < PCI_ROM_RESOURCE; bar++) { 1899 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) 1900 continue; 1901 ap->ranges[idx].base = pci_resource_start(pdev, bar); 1902 ap->ranges[idx].size = pci_resource_len(pdev, bar); 1903 pci_info(pdev, "%s: bar %d: 0x%lx -> 0x%lx\n", __func__, bar, 1904 (unsigned long)pci_resource_start(pdev, bar), 1905 (unsigned long)pci_resource_end(pdev, bar)); 1906 idx++; 1907 if (res_id == bar) 1908 res_id_found = true; 1909 } 1910 if (!res_id_found) 1911 pci_warn(pdev, "%s: passed res_id (%d) is not a memory bar\n", 1912 __func__, res_id); 1913 1914 #ifdef CONFIG_X86 1915 primary = pdev->resource[PCI_ROM_RESOURCE].flags & 1916 IORESOURCE_ROM_SHADOW; 1917 #endif 1918 err = remove_conflicting_framebuffers(ap, name, primary); 1919 kfree(ap); 1920 return err; 1921 } 1922 EXPORT_SYMBOL(remove_conflicting_pci_framebuffers); 1923 1924 /** 1925 * register_framebuffer - registers a frame buffer device 1926 * @fb_info: frame buffer info structure 1927 * 1928 * Registers a frame buffer device @fb_info. 1929 * 1930 * Returns negative errno on error, or zero for success. 1931 * 1932 */ 1933 int 1934 register_framebuffer(struct fb_info *fb_info) 1935 { 1936 int ret; 1937 1938 mutex_lock(®istration_lock); 1939 ret = do_register_framebuffer(fb_info); 1940 mutex_unlock(®istration_lock); 1941 1942 return ret; 1943 } 1944 EXPORT_SYMBOL(register_framebuffer); 1945 1946 /** 1947 * unregister_framebuffer - releases a frame buffer device 1948 * @fb_info: frame buffer info structure 1949 * 1950 * Unregisters a frame buffer device @fb_info. 1951 * 1952 * Returns negative errno on error, or zero for success. 1953 * 1954 * This function will also notify the framebuffer console 1955 * to release the driver. 1956 * 1957 * This is meant to be called within a driver's module_exit() 1958 * function. If this is called outside module_exit(), ensure 1959 * that the driver implements fb_open() and fb_release() to 1960 * check that no processes are using the device. 1961 */ 1962 int 1963 unregister_framebuffer(struct fb_info *fb_info) 1964 { 1965 int ret; 1966 1967 mutex_lock(®istration_lock); 1968 ret = do_unregister_framebuffer(fb_info); 1969 mutex_unlock(®istration_lock); 1970 1971 return ret; 1972 } 1973 EXPORT_SYMBOL(unregister_framebuffer); 1974 1975 /** 1976 * fb_set_suspend - low level driver signals suspend 1977 * @info: framebuffer affected 1978 * @state: 0 = resuming, !=0 = suspending 1979 * 1980 * This is meant to be used by low level drivers to 1981 * signal suspend/resume to the core & clients. 1982 * It must be called with the console semaphore held 1983 */ 1984 void fb_set_suspend(struct fb_info *info, int state) 1985 { 1986 struct fb_event event; 1987 1988 event.info = info; 1989 if (state) { 1990 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event); 1991 info->state = FBINFO_STATE_SUSPENDED; 1992 } else { 1993 info->state = FBINFO_STATE_RUNNING; 1994 fb_notifier_call_chain(FB_EVENT_RESUME, &event); 1995 } 1996 } 1997 EXPORT_SYMBOL(fb_set_suspend); 1998 1999 /** 2000 * fbmem_init - init frame buffer subsystem 2001 * 2002 * Initialize the frame buffer subsystem. 2003 * 2004 * NOTE: This function is _only_ to be called by drivers/char/mem.c. 2005 * 2006 */ 2007 2008 static int __init 2009 fbmem_init(void) 2010 { 2011 int ret; 2012 2013 if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops)) 2014 return -ENOMEM; 2015 2016 ret = register_chrdev(FB_MAJOR, "fb", &fb_fops); 2017 if (ret) { 2018 printk("unable to get major %d for fb devs\n", FB_MAJOR); 2019 goto err_chrdev; 2020 } 2021 2022 fb_class = class_create(THIS_MODULE, "graphics"); 2023 if (IS_ERR(fb_class)) { 2024 ret = PTR_ERR(fb_class); 2025 pr_warn("Unable to create fb class; errno = %d\n", ret); 2026 fb_class = NULL; 2027 goto err_class; 2028 } 2029 2030 fb_console_init(); 2031 2032 return 0; 2033 2034 err_class: 2035 unregister_chrdev(FB_MAJOR, "fb"); 2036 err_chrdev: 2037 remove_proc_entry("fb", NULL); 2038 return ret; 2039 } 2040 2041 #ifdef MODULE 2042 module_init(fbmem_init); 2043 static void __exit 2044 fbmem_exit(void) 2045 { 2046 fb_console_exit(); 2047 2048 remove_proc_entry("fb", NULL); 2049 class_destroy(fb_class); 2050 unregister_chrdev(FB_MAJOR, "fb"); 2051 } 2052 2053 module_exit(fbmem_exit); 2054 MODULE_LICENSE("GPL"); 2055 MODULE_DESCRIPTION("Framebuffer base"); 2056 #else 2057 subsys_initcall(fbmem_init); 2058 #endif 2059 2060 int fb_new_modelist(struct fb_info *info) 2061 { 2062 struct fb_event event; 2063 struct fb_var_screeninfo var = info->var; 2064 struct list_head *pos, *n; 2065 struct fb_modelist *modelist; 2066 struct fb_videomode *m, mode; 2067 int err = 1; 2068 2069 list_for_each_safe(pos, n, &info->modelist) { 2070 modelist = list_entry(pos, struct fb_modelist, list); 2071 m = &modelist->mode; 2072 fb_videomode_to_var(&var, m); 2073 var.activate = FB_ACTIVATE_TEST; 2074 err = fb_set_var(info, &var); 2075 fb_var_to_videomode(&mode, &var); 2076 if (err || !fb_mode_is_equal(m, &mode)) { 2077 list_del(pos); 2078 kfree(pos); 2079 } 2080 } 2081 2082 err = 1; 2083 2084 if (!list_empty(&info->modelist)) { 2085 event.info = info; 2086 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event); 2087 } 2088 2089 return err; 2090 } 2091 2092 MODULE_LICENSE("GPL"); 2093