linux/drivers/video/fbdev/core/fbmem.c
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   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
  48static DEFINE_MUTEX(registration_lock);
  49
  50struct fb_info *registered_fb[FB_MAX] __read_mostly;
  51EXPORT_SYMBOL(registered_fb);
  52
  53int num_registered_fb __read_mostly;
  54EXPORT_SYMBOL(num_registered_fb);
  55
  56bool fb_center_logo __read_mostly;
  57
  58int fb_logo_count __read_mostly = -1;
  59
  60static struct fb_info *get_fb_info(unsigned int idx)
  61{
  62        struct fb_info *fb_info;
  63
  64        if (idx >= FB_MAX)
  65                return ERR_PTR(-ENODEV);
  66
  67        mutex_lock(&registration_lock);
  68        fb_info = registered_fb[idx];
  69        if (fb_info)
  70                atomic_inc(&fb_info->count);
  71        mutex_unlock(&registration_lock);
  72
  73        return fb_info;
  74}
  75
  76static void put_fb_info(struct fb_info *fb_info)
  77{
  78        if (!atomic_dec_and_test(&fb_info->count))
  79                return;
  80        if (fb_info->fbops->fb_destroy)
  81                fb_info->fbops->fb_destroy(fb_info);
  82}
  83
  84/*
  85 * Helpers
  86 */
  87
  88int fb_get_color_depth(struct fb_var_screeninfo *var,
  89                       struct fb_fix_screeninfo *fix)
  90{
  91        int depth = 0;
  92
  93        if (fix->visual == FB_VISUAL_MONO01 ||
  94            fix->visual == FB_VISUAL_MONO10)
  95                depth = 1;
  96        else {
  97                if (var->green.length == var->blue.length &&
  98                    var->green.length == var->red.length &&
  99                    var->green.offset == var->blue.offset &&
 100                    var->green.offset == var->red.offset)
 101                        depth = var->green.length;
 102                else
 103                        depth = var->green.length + var->red.length +
 104                                var->blue.length;
 105        }
 106
 107        return depth;
 108}
 109EXPORT_SYMBOL(fb_get_color_depth);
 110
 111/*
 112 * Data padding functions.
 113 */
 114void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
 115{
 116        __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
 117}
 118EXPORT_SYMBOL(fb_pad_aligned_buffer);
 119
 120void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
 121                                u32 shift_high, u32 shift_low, u32 mod)
 122{
 123        u8 mask = (u8) (0xfff << shift_high), tmp;
 124        int i, j;
 125
 126        for (i = height; i--; ) {
 127                for (j = 0; j < idx; j++) {
 128                        tmp = dst[j];
 129                        tmp &= mask;
 130                        tmp |= *src >> shift_low;
 131                        dst[j] = tmp;
 132                        tmp = *src << shift_high;
 133                        dst[j+1] = tmp;
 134                        src++;
 135                }
 136                tmp = dst[idx];
 137                tmp &= mask;
 138                tmp |= *src >> shift_low;
 139                dst[idx] = tmp;
 140                if (shift_high < mod) {
 141                        tmp = *src << shift_high;
 142                        dst[idx+1] = tmp;
 143                }
 144                src++;
 145                dst += d_pitch;
 146        }
 147}
 148EXPORT_SYMBOL(fb_pad_unaligned_buffer);
 149
 150/*
 151 * we need to lock this section since fb_cursor
 152 * may use fb_imageblit()
 153 */
 154char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
 155{
 156        u32 align = buf->buf_align - 1, offset;
 157        char *addr = buf->addr;
 158
 159        /* If IO mapped, we need to sync before access, no sharing of
 160         * the pixmap is done
 161         */
 162        if (buf->flags & FB_PIXMAP_IO) {
 163                if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 164                        info->fbops->fb_sync(info);
 165                return addr;
 166        }
 167
 168        /* See if we fit in the remaining pixmap space */
 169        offset = buf->offset + align;
 170        offset &= ~align;
 171        if (offset + size > buf->size) {
 172                /* We do not fit. In order to be able to re-use the buffer,
 173                 * we must ensure no asynchronous DMA'ing or whatever operation
 174                 * is in progress, we sync for that.
 175                 */
 176                if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
 177                        info->fbops->fb_sync(info);
 178                offset = 0;
 179        }
 180        buf->offset = offset + size;
 181        addr += offset;
 182
 183        return addr;
 184}
 185EXPORT_SYMBOL(fb_get_buffer_offset);
 186
 187#ifdef CONFIG_LOGO
 188
 189static inline unsigned safe_shift(unsigned d, int n)
 190{
 191        return n < 0 ? d >> -n : d << n;
 192}
 193
 194static void fb_set_logocmap(struct fb_info *info,
 195                                   const struct linux_logo *logo)
 196{
 197        struct fb_cmap palette_cmap;
 198        u16 palette_green[16];
 199        u16 palette_blue[16];
 200        u16 palette_red[16];
 201        int i, j, n;
 202        const unsigned char *clut = logo->clut;
 203
 204        palette_cmap.start = 0;
 205        palette_cmap.len = 16;
 206        palette_cmap.red = palette_red;
 207        palette_cmap.green = palette_green;
 208        palette_cmap.blue = palette_blue;
 209        palette_cmap.transp = NULL;
 210
 211        for (i = 0; i < logo->clutsize; i += n) {
 212                n = logo->clutsize - i;
 213                /* palette_cmap provides space for only 16 colors at once */
 214                if (n > 16)
 215                        n = 16;
 216                palette_cmap.start = 32 + i;
 217                palette_cmap.len = n;
 218                for (j = 0; j < n; ++j) {
 219                        palette_cmap.red[j] = clut[0] << 8 | clut[0];
 220                        palette_cmap.green[j] = clut[1] << 8 | clut[1];
 221                        palette_cmap.blue[j] = clut[2] << 8 | clut[2];
 222                        clut += 3;
 223                }
 224                fb_set_cmap(&palette_cmap, info);
 225        }
 226}
 227
 228static void  fb_set_logo_truepalette(struct fb_info *info,
 229                                            const struct linux_logo *logo,
 230                                            u32 *palette)
 231{
 232        static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
 233        unsigned char redmask, greenmask, bluemask;
 234        int redshift, greenshift, blueshift;
 235        int i;
 236        const unsigned char *clut = logo->clut;
 237
 238        /*
 239         * We have to create a temporary palette since console palette is only
 240         * 16 colors long.
 241         */
 242        /* Bug: Doesn't obey msb_right ... (who needs that?) */
 243        redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
 244        greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
 245        bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
 246        redshift   = info->var.red.offset   - (8 - info->var.red.length);
 247        greenshift = info->var.green.offset - (8 - info->var.green.length);
 248        blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
 249
 250        for ( i = 0; i < logo->clutsize; i++) {
 251                palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
 252                                 safe_shift((clut[1] & greenmask), greenshift) |
 253                                 safe_shift((clut[2] & bluemask), blueshift));
 254                clut += 3;
 255        }
 256}
 257
 258static void fb_set_logo_directpalette(struct fb_info *info,
 259                                             const struct linux_logo *logo,
 260                                             u32 *palette)
 261{
 262        int redshift, greenshift, blueshift;
 263        int i;
 264
 265        redshift = info->var.red.offset;
 266        greenshift = info->var.green.offset;
 267        blueshift = info->var.blue.offset;
 268
 269        for (i = 32; i < 32 + logo->clutsize; i++)
 270                palette[i] = i << redshift | i << greenshift | i << blueshift;
 271}
 272
 273static void fb_set_logo(struct fb_info *info,
 274                               const struct linux_logo *logo, u8 *dst,
 275                               int depth)
 276{
 277        int i, j, k;
 278        const u8 *src = logo->data;
 279        u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 280        u8 fg = 1, d;
 281
 282        switch (fb_get_color_depth(&info->var, &info->fix)) {
 283        case 1:
 284                fg = 1;
 285                break;
 286        case 2:
 287                fg = 3;
 288                break;
 289        default:
 290                fg = 7;
 291                break;
 292        }
 293
 294        if (info->fix.visual == FB_VISUAL_MONO01 ||
 295            info->fix.visual == FB_VISUAL_MONO10)
 296                fg = ~((u8) (0xfff << info->var.green.length));
 297
 298        switch (depth) {
 299        case 4:
 300                for (i = 0; i < logo->height; i++)
 301                        for (j = 0; j < logo->width; src++) {
 302                                *dst++ = *src >> 4;
 303                                j++;
 304                                if (j < logo->width) {
 305                                        *dst++ = *src & 0x0f;
 306                                        j++;
 307                                }
 308                        }
 309                break;
 310        case 1:
 311                for (i = 0; i < logo->height; i++) {
 312                        for (j = 0; j < logo->width; src++) {
 313                                d = *src ^ xor;
 314                                for (k = 7; k >= 0 && j < logo->width; k--) {
 315                                        *dst++ = ((d >> k) & 1) ? fg : 0;
 316                                        j++;
 317                                }
 318                        }
 319                }
 320                break;
 321        }
 322}
 323
 324/*
 325 * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 326 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 327 * the visual format and color depth of the framebuffer, the DAC, the
 328 * pseudo_palette, and the logo data will be adjusted accordingly.
 329 *
 330 * Case 1 - linux_logo_clut224:
 331 * Color exceeds the number of console colors (16), thus we set the hardware DAC
 332 * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 333 *
 334 * For visuals that require color info from the pseudo_palette, we also construct
 335 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 336 * will be set.
 337 *
 338 * Case 2 - linux_logo_vga16:
 339 * The number of colors just matches the console colors, thus there is no need
 340 * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 341 * each byte contains color information for two pixels (upper and lower nibble).
 342 * To be consistent with fb_imageblit() usage, we therefore separate the two
 343 * nibbles into separate bytes. The "depth" flag will be set to 4.
 344 *
 345 * Case 3 - linux_logo_mono:
 346 * This is similar with Case 2.  Each byte contains information for 8 pixels.
 347 * We isolate each bit and expand each into a byte. The "depth" flag will
 348 * be set to 1.
 349 */
 350static struct logo_data {
 351        int depth;
 352        int needs_directpalette;
 353        int needs_truepalette;
 354        int needs_cmapreset;
 355        const struct linux_logo *logo;
 356} fb_logo __read_mostly;
 357
 358static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
 359{
 360        u32 size = width * height, i;
 361
 362        out += size - 1;
 363
 364        for (i = size; i--; )
 365                *out-- = *in++;
 366}
 367
 368static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
 369{
 370        int i, j, h = height - 1;
 371
 372        for (i = 0; i < height; i++)
 373                for (j = 0; j < width; j++)
 374                                out[height * j + h - i] = *in++;
 375}
 376
 377static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
 378{
 379        int i, j, w = width - 1;
 380
 381        for (i = 0; i < height; i++)
 382                for (j = 0; j < width; j++)
 383                        out[height * (w - j) + i] = *in++;
 384}
 385
 386static void fb_rotate_logo(struct fb_info *info, u8 *dst,
 387                           struct fb_image *image, int rotate)
 388{
 389        u32 tmp;
 390
 391        if (rotate == FB_ROTATE_UD) {
 392                fb_rotate_logo_ud(image->data, dst, image->width,
 393                                  image->height);
 394                image->dx = info->var.xres - image->width - image->dx;
 395                image->dy = info->var.yres - image->height - image->dy;
 396        } else if (rotate == FB_ROTATE_CW) {
 397                fb_rotate_logo_cw(image->data, dst, image->width,
 398                                  image->height);
 399                tmp = image->width;
 400                image->width = image->height;
 401                image->height = tmp;
 402                tmp = image->dy;
 403                image->dy = image->dx;
 404                image->dx = info->var.xres - image->width - tmp;
 405        } else if (rotate == FB_ROTATE_CCW) {
 406                fb_rotate_logo_ccw(image->data, dst, image->width,
 407                                   image->height);
 408                tmp = image->width;
 409                image->width = image->height;
 410                image->height = tmp;
 411                tmp = image->dx;
 412                image->dx = image->dy;
 413                image->dy = info->var.yres - image->height - tmp;
 414        }
 415
 416        image->data = dst;
 417}
 418
 419static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
 420                            int rotate, unsigned int num)
 421{
 422        unsigned int x;
 423
 424        if (image->width > info->var.xres || image->height > info->var.yres)
 425                return;
 426
 427        if (rotate == FB_ROTATE_UR) {
 428                for (x = 0;
 429                     x < num && image->dx + image->width <= info->var.xres;
 430                     x++) {
 431                        info->fbops->fb_imageblit(info, image);
 432                        image->dx += image->width + 8;
 433                }
 434        } else if (rotate == FB_ROTATE_UD) {
 435                u32 dx = image->dx;
 436
 437                for (x = 0; x < num && image->dx <= dx; x++) {
 438                        info->fbops->fb_imageblit(info, image);
 439                        image->dx -= image->width + 8;
 440                }
 441        } else if (rotate == FB_ROTATE_CW) {
 442                for (x = 0;
 443                     x < num && image->dy + image->height <= info->var.yres;
 444                     x++) {
 445                        info->fbops->fb_imageblit(info, image);
 446                        image->dy += image->height + 8;
 447                }
 448        } else if (rotate == FB_ROTATE_CCW) {
 449                u32 dy = image->dy;
 450
 451                for (x = 0; x < num && image->dy <= dy; x++) {
 452                        info->fbops->fb_imageblit(info, image);
 453                        image->dy -= image->height + 8;
 454                }
 455        }
 456}
 457
 458static int fb_show_logo_line(struct fb_info *info, int rotate,
 459                             const struct linux_logo *logo, int y,
 460                             unsigned int n)
 461{
 462        u32 *palette = NULL, *saved_pseudo_palette = NULL;
 463        unsigned char *logo_new = NULL, *logo_rotate = NULL;
 464        struct fb_image image;
 465
 466        /* Return if the frame buffer is not mapped or suspended */
 467        if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
 468            info->fbops->owner)
 469                return 0;
 470
 471        image.depth = 8;
 472        image.data = logo->data;
 473
 474        if (fb_logo.needs_cmapreset)
 475                fb_set_logocmap(info, logo);
 476
 477        if (fb_logo.needs_truepalette ||
 478            fb_logo.needs_directpalette) {
 479                palette = kmalloc(256 * 4, GFP_KERNEL);
 480                if (palette == NULL)
 481                        return 0;
 482
 483                if (fb_logo.needs_truepalette)
 484                        fb_set_logo_truepalette(info, logo, palette);
 485                else
 486                        fb_set_logo_directpalette(info, logo, palette);
 487
 488                saved_pseudo_palette = info->pseudo_palette;
 489                info->pseudo_palette = palette;
 490        }
 491
 492        if (fb_logo.depth <= 4) {
 493                logo_new = kmalloc_array(logo->width, logo->height,
 494                                         GFP_KERNEL);
 495                if (logo_new == NULL) {
 496                        kfree(palette);
 497                        if (saved_pseudo_palette)
 498                                info->pseudo_palette = saved_pseudo_palette;
 499                        return 0;
 500                }
 501                image.data = logo_new;
 502                fb_set_logo(info, logo, logo_new, fb_logo.depth);
 503        }
 504
 505        if (fb_center_logo) {
 506                int xres = info->var.xres;
 507                int yres = info->var.yres;
 508
 509                if (rotate == FB_ROTATE_CW || rotate == FB_ROTATE_CCW) {
 510                        xres = info->var.yres;
 511                        yres = info->var.xres;
 512                }
 513
 514                while (n && (n * (logo->width + 8) - 8 > xres))
 515                        --n;
 516                image.dx = (xres - n * (logo->width + 8) - 8) / 2;
 517                image.dy = y ?: (yres - logo->height) / 2;
 518        } else {
 519                image.dx = 0;
 520                image.dy = y;
 521        }
 522
 523        image.width = logo->width;
 524        image.height = logo->height;
 525
 526        if (rotate) {
 527                logo_rotate = kmalloc_array(logo->width, logo->height,
 528                                            GFP_KERNEL);
 529                if (logo_rotate)
 530                        fb_rotate_logo(info, logo_rotate, &image, rotate);
 531        }
 532
 533        fb_do_show_logo(info, &image, rotate, n);
 534
 535        kfree(palette);
 536        if (saved_pseudo_palette != NULL)
 537                info->pseudo_palette = saved_pseudo_palette;
 538        kfree(logo_new);
 539        kfree(logo_rotate);
 540        return image.dy + logo->height;
 541}
 542
 543
 544#ifdef CONFIG_FB_LOGO_EXTRA
 545
 546#define FB_LOGO_EX_NUM_MAX 10
 547static struct logo_data_extra {
 548        const struct linux_logo *logo;
 549        unsigned int n;
 550} fb_logo_ex[FB_LOGO_EX_NUM_MAX];
 551static unsigned int fb_logo_ex_num;
 552
 553void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
 554{
 555        if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
 556                return;
 557
 558        fb_logo_ex[fb_logo_ex_num].logo = logo;
 559        fb_logo_ex[fb_logo_ex_num].n = n;
 560        fb_logo_ex_num++;
 561}
 562
 563static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
 564                                  unsigned int yres)
 565{
 566        unsigned int i;
 567
 568        /* FIXME: logo_ex supports only truecolor fb. */
 569        if (info->fix.visual != FB_VISUAL_TRUECOLOR)
 570                fb_logo_ex_num = 0;
 571
 572        for (i = 0; i < fb_logo_ex_num; i++) {
 573                if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
 574                        fb_logo_ex[i].logo = NULL;
 575                        continue;
 576                }
 577                height += fb_logo_ex[i].logo->height;
 578                if (height > yres) {
 579                        height -= fb_logo_ex[i].logo->height;
 580                        fb_logo_ex_num = i;
 581                        break;
 582                }
 583        }
 584        return height;
 585}
 586
 587static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 588{
 589        unsigned int i;
 590
 591        for (i = 0; i < fb_logo_ex_num; i++)
 592                y = fb_show_logo_line(info, rotate,
 593                                      fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
 594
 595        return y;
 596}
 597
 598#else /* !CONFIG_FB_LOGO_EXTRA */
 599
 600static inline int fb_prepare_extra_logos(struct fb_info *info,
 601                                         unsigned int height,
 602                                         unsigned int yres)
 603{
 604        return height;
 605}
 606
 607static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
 608{
 609        return y;
 610}
 611
 612#endif /* CONFIG_FB_LOGO_EXTRA */
 613
 614
 615int fb_prepare_logo(struct fb_info *info, int rotate)
 616{
 617        int depth = fb_get_color_depth(&info->var, &info->fix);
 618        unsigned int yres;
 619        int height;
 620
 621        memset(&fb_logo, 0, sizeof(struct logo_data));
 622
 623        if (info->flags & FBINFO_MISC_TILEBLITTING ||
 624            info->fbops->owner || !fb_logo_count)
 625                return 0;
 626
 627        if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 628                depth = info->var.blue.length;
 629                if (info->var.red.length < depth)
 630                        depth = info->var.red.length;
 631                if (info->var.green.length < depth)
 632                        depth = info->var.green.length;
 633        }
 634
 635        if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
 636                /* assume console colormap */
 637                depth = 4;
 638        }
 639
 640        /* Return if no suitable logo was found */
 641        fb_logo.logo = fb_find_logo(depth);
 642
 643        if (!fb_logo.logo) {
 644                return 0;
 645        }
 646
 647        if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
 648                yres = info->var.yres;
 649        else
 650                yres = info->var.xres;
 651
 652        if (fb_logo.logo->height > yres) {
 653                fb_logo.logo = NULL;
 654                return 0;
 655        }
 656
 657        /* What depth we asked for might be different from what we get */
 658        if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
 659                fb_logo.depth = 8;
 660        else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
 661                fb_logo.depth = 4;
 662        else
 663                fb_logo.depth = 1;
 664
 665
 666        if (fb_logo.depth > 4 && depth > 4) {
 667                switch (info->fix.visual) {
 668                case FB_VISUAL_TRUECOLOR:
 669                        fb_logo.needs_truepalette = 1;
 670                        break;
 671                case FB_VISUAL_DIRECTCOLOR:
 672                        fb_logo.needs_directpalette = 1;
 673                        fb_logo.needs_cmapreset = 1;
 674                        break;
 675                case FB_VISUAL_PSEUDOCOLOR:
 676                        fb_logo.needs_cmapreset = 1;
 677                        break;
 678                }
 679        }
 680
 681        height = fb_logo.logo->height;
 682        if (fb_center_logo)
 683                height += (yres - fb_logo.logo->height) / 2;
 684
 685        return fb_prepare_extra_logos(info, height, yres);
 686}
 687
 688int fb_show_logo(struct fb_info *info, int rotate)
 689{
 690        unsigned int count;
 691        int y;
 692
 693        if (!fb_logo_count)
 694                return 0;
 695
 696        count = fb_logo_count < 0 ? num_online_cpus() : fb_logo_count;
 697        y = fb_show_logo_line(info, rotate, fb_logo.logo, 0, count);
 698        y = fb_show_extra_logos(info, y, rotate);
 699
 700        return y;
 701}
 702#else
 703int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
 704int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 705#endif /* CONFIG_LOGO */
 706EXPORT_SYMBOL(fb_prepare_logo);
 707EXPORT_SYMBOL(fb_show_logo);
 708
 709static void *fb_seq_start(struct seq_file *m, loff_t *pos)
 710{
 711        mutex_lock(&registration_lock);
 712        return (*pos < FB_MAX) ? pos : NULL;
 713}
 714
 715static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
 716{
 717        (*pos)++;
 718        return (*pos < FB_MAX) ? pos : NULL;
 719}
 720
 721static void fb_seq_stop(struct seq_file *m, void *v)
 722{
 723        mutex_unlock(&registration_lock);
 724}
 725
 726static int fb_seq_show(struct seq_file *m, void *v)
 727{
 728        int i = *(loff_t *)v;
 729        struct fb_info *fi = registered_fb[i];
 730
 731        if (fi)
 732                seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
 733        return 0;
 734}
 735
 736static const struct seq_operations __maybe_unused proc_fb_seq_ops = {
 737        .start  = fb_seq_start,
 738        .next   = fb_seq_next,
 739        .stop   = fb_seq_stop,
 740        .show   = fb_seq_show,
 741};
 742
 743/*
 744 * We hold a reference to the fb_info in file->private_data,
 745 * but if the current registered fb has changed, we don't
 746 * actually want to use it.
 747 *
 748 * So look up the fb_info using the inode minor number,
 749 * and just verify it against the reference we have.
 750 */
 751static struct fb_info *file_fb_info(struct file *file)
 752{
 753        struct inode *inode = file_inode(file);
 754        int fbidx = iminor(inode);
 755        struct fb_info *info = registered_fb[fbidx];
 756
 757        if (info != file->private_data)
 758                info = NULL;
 759        return info;
 760}
 761
 762static ssize_t
 763fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 764{
 765        unsigned long p = *ppos;
 766        struct fb_info *info = file_fb_info(file);
 767        u8 *buffer, *dst;
 768        u8 __iomem *src;
 769        int c, cnt = 0, err = 0;
 770        unsigned long total_size;
 771
 772        if (!info || ! info->screen_base)
 773                return -ENODEV;
 774
 775        if (info->state != FBINFO_STATE_RUNNING)
 776                return -EPERM;
 777
 778        if (info->fbops->fb_read)
 779                return info->fbops->fb_read(info, buf, count, ppos);
 780
 781        total_size = info->screen_size;
 782
 783        if (total_size == 0)
 784                total_size = info->fix.smem_len;
 785
 786        if (p >= total_size)
 787                return 0;
 788
 789        if (count >= total_size)
 790                count = total_size;
 791
 792        if (count + p > total_size)
 793                count = total_size - p;
 794
 795        buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 796                         GFP_KERNEL);
 797        if (!buffer)
 798                return -ENOMEM;
 799
 800        src = (u8 __iomem *) (info->screen_base + p);
 801
 802        if (info->fbops->fb_sync)
 803                info->fbops->fb_sync(info);
 804
 805        while (count) {
 806                c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 807                dst = buffer;
 808                fb_memcpy_fromfb(dst, src, c);
 809                dst += c;
 810                src += c;
 811
 812                if (copy_to_user(buf, buffer, c)) {
 813                        err = -EFAULT;
 814                        break;
 815                }
 816                *ppos += c;
 817                buf += c;
 818                cnt += c;
 819                count -= c;
 820        }
 821
 822        kfree(buffer);
 823
 824        return (err) ? err : cnt;
 825}
 826
 827static ssize_t
 828fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 829{
 830        unsigned long p = *ppos;
 831        struct fb_info *info = file_fb_info(file);
 832        u8 *buffer, *src;
 833        u8 __iomem *dst;
 834        int c, cnt = 0, err = 0;
 835        unsigned long total_size;
 836
 837        if (!info || !info->screen_base)
 838                return -ENODEV;
 839
 840        if (info->state != FBINFO_STATE_RUNNING)
 841                return -EPERM;
 842
 843        if (info->fbops->fb_write)
 844                return info->fbops->fb_write(info, buf, count, ppos);
 845
 846        total_size = info->screen_size;
 847
 848        if (total_size == 0)
 849                total_size = info->fix.smem_len;
 850
 851        if (p > total_size)
 852                return -EFBIG;
 853
 854        if (count > total_size) {
 855                err = -EFBIG;
 856                count = total_size;
 857        }
 858
 859        if (count + p > total_size) {
 860                if (!err)
 861                        err = -ENOSPC;
 862
 863                count = total_size - p;
 864        }
 865
 866        buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
 867                         GFP_KERNEL);
 868        if (!buffer)
 869                return -ENOMEM;
 870
 871        dst = (u8 __iomem *) (info->screen_base + p);
 872
 873        if (info->fbops->fb_sync)
 874                info->fbops->fb_sync(info);
 875
 876        while (count) {
 877                c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
 878                src = buffer;
 879
 880                if (copy_from_user(src, buf, c)) {
 881                        err = -EFAULT;
 882                        break;
 883                }
 884
 885                fb_memcpy_tofb(dst, src, c);
 886                dst += c;
 887                src += c;
 888                *ppos += c;
 889                buf += c;
 890                cnt += c;
 891                count -= c;
 892        }
 893
 894        kfree(buffer);
 895
 896        return (cnt) ? cnt : err;
 897}
 898
 899int
 900fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
 901{
 902        struct fb_fix_screeninfo *fix = &info->fix;
 903        unsigned int yres = info->var.yres;
 904        int err = 0;
 905
 906        if (var->yoffset > 0) {
 907                if (var->vmode & FB_VMODE_YWRAP) {
 908                        if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
 909                                err = -EINVAL;
 910                        else
 911                                yres = 0;
 912                } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
 913                        err = -EINVAL;
 914        }
 915
 916        if (var->xoffset > 0 && (!fix->xpanstep ||
 917                                 (var->xoffset % fix->xpanstep)))
 918                err = -EINVAL;
 919
 920        if (err || !info->fbops->fb_pan_display ||
 921            var->yoffset > info->var.yres_virtual - yres ||
 922            var->xoffset > info->var.xres_virtual - info->var.xres)
 923                return -EINVAL;
 924
 925        if ((err = info->fbops->fb_pan_display(var, info)))
 926                return err;
 927        info->var.xoffset = var->xoffset;
 928        info->var.yoffset = var->yoffset;
 929        if (var->vmode & FB_VMODE_YWRAP)
 930                info->var.vmode |= FB_VMODE_YWRAP;
 931        else
 932                info->var.vmode &= ~FB_VMODE_YWRAP;
 933        return 0;
 934}
 935EXPORT_SYMBOL(fb_pan_display);
 936
 937static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
 938                         u32 activate)
 939{
 940        struct fb_blit_caps caps, fbcaps;
 941        int err = 0;
 942
 943        memset(&caps, 0, sizeof(caps));
 944        memset(&fbcaps, 0, sizeof(fbcaps));
 945        caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
 946        fbcon_get_requirement(info, &caps);
 947        info->fbops->fb_get_caps(info, &fbcaps, var);
 948
 949        if (((fbcaps.x ^ caps.x) & caps.x) ||
 950            ((fbcaps.y ^ caps.y) & caps.y) ||
 951            (fbcaps.len < caps.len))
 952                err = -EINVAL;
 953
 954        return err;
 955}
 956
 957int
 958fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 959{
 960        int ret = 0;
 961        u32 activate;
 962        struct fb_var_screeninfo old_var;
 963        struct fb_videomode mode;
 964        struct fb_event event;
 965
 966        if (var->activate & FB_ACTIVATE_INV_MODE) {
 967                struct fb_videomode mode1, mode2;
 968
 969                fb_var_to_videomode(&mode1, var);
 970                fb_var_to_videomode(&mode2, &info->var);
 971                /* make sure we don't delete the videomode of current var */
 972                ret = fb_mode_is_equal(&mode1, &mode2);
 973                if (!ret) {
 974                        ret = fbcon_mode_deleted(info, &mode1);
 975                        if (!ret)
 976                                fb_delete_videomode(&mode1, &info->modelist);
 977                }
 978
 979                return ret ? -EINVAL : 0;
 980        }
 981
 982        if (!(var->activate & FB_ACTIVATE_FORCE) &&
 983            !memcmp(&info->var, var, sizeof(struct fb_var_screeninfo)))
 984                return 0;
 985
 986        activate = var->activate;
 987
 988        /* When using FOURCC mode, make sure the red, green, blue and
 989         * transp fields are set to 0.
 990         */
 991        if ((info->fix.capabilities & FB_CAP_FOURCC) &&
 992            var->grayscale > 1) {
 993                if (var->red.offset     || var->green.offset    ||
 994                    var->blue.offset    || var->transp.offset   ||
 995                    var->red.length     || var->green.length    ||
 996                    var->blue.length    || var->transp.length   ||
 997                    var->red.msb_right  || var->green.msb_right ||
 998                    var->blue.msb_right || var->transp.msb_right)
 999                        return -EINVAL;
1000        }
1001
1002        if (!info->fbops->fb_check_var) {
1003                *var = info->var;
1004                return 0;
1005        }
1006
1007        /* bitfill_aligned() assumes that it's at least 8x8 */
1008        if (var->xres < 8 || var->yres < 8)
1009                return -EINVAL;
1010
1011        ret = info->fbops->fb_check_var(var, info);
1012
1013        if (ret)
1014                return ret;
1015
1016        if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW)
1017                return 0;
1018
1019        if (info->fbops->fb_get_caps) {
1020                ret = fb_check_caps(info, var, activate);
1021
1022                if (ret)
1023                        return ret;
1024        }
1025
1026        old_var = info->var;
1027        info->var = *var;
1028
1029        if (info->fbops->fb_set_par) {
1030                ret = info->fbops->fb_set_par(info);
1031
1032                if (ret) {
1033                        info->var = old_var;
1034                        printk(KERN_WARNING "detected "
1035                                "fb_set_par error, "
1036                                "error code: %d\n", ret);
1037                        return ret;
1038                }
1039        }
1040
1041        fb_pan_display(info, &info->var);
1042        fb_set_cmap(&info->cmap, info);
1043        fb_var_to_videomode(&mode, &info->var);
1044
1045        if (info->modelist.prev && info->modelist.next &&
1046            !list_empty(&info->modelist))
1047                ret = fb_add_videomode(&mode, &info->modelist);
1048
1049        if (ret)
1050                return ret;
1051
1052        event.info = info;
1053        event.data = &mode;
1054        fb_notifier_call_chain(FB_EVENT_MODE_CHANGE, &event);
1055
1056        return 0;
1057}
1058EXPORT_SYMBOL(fb_set_var);
1059
1060int
1061fb_blank(struct fb_info *info, int blank)
1062{
1063        struct fb_event event;
1064        int ret = -EINVAL;
1065
1066        if (blank > FB_BLANK_POWERDOWN)
1067                blank = FB_BLANK_POWERDOWN;
1068
1069        event.info = info;
1070        event.data = &blank;
1071
1072        if (info->fbops->fb_blank)
1073                ret = info->fbops->fb_blank(blank, info);
1074
1075        if (!ret)
1076                fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1077
1078        return ret;
1079}
1080EXPORT_SYMBOL(fb_blank);
1081
1082static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1083                        unsigned long arg)
1084{
1085        const struct fb_ops *fb;
1086        struct fb_var_screeninfo var;
1087        struct fb_fix_screeninfo fix;
1088        struct fb_cmap cmap_from;
1089        struct fb_cmap_user cmap;
1090        void __user *argp = (void __user *)arg;
1091        long ret = 0;
1092
1093        switch (cmd) {
1094        case FBIOGET_VSCREENINFO:
1095                lock_fb_info(info);
1096                var = info->var;
1097                unlock_fb_info(info);
1098
1099                ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1100                break;
1101        case FBIOPUT_VSCREENINFO:
1102                if (copy_from_user(&var, argp, sizeof(var)))
1103                        return -EFAULT;
1104                console_lock();
1105                lock_fb_info(info);
1106                ret = fb_set_var(info, &var);
1107                if (!ret)
1108                        fbcon_update_vcs(info, var.activate & FB_ACTIVATE_ALL);
1109                unlock_fb_info(info);
1110                console_unlock();
1111                if (!ret && copy_to_user(argp, &var, sizeof(var)))
1112                        ret = -EFAULT;
1113                break;
1114        case FBIOGET_FSCREENINFO:
1115                lock_fb_info(info);
1116                memcpy(&fix, &info->fix, sizeof(fix));
1117                if (info->flags & FBINFO_HIDE_SMEM_START)
1118                        fix.smem_start = 0;
1119                unlock_fb_info(info);
1120
1121                ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1122                break;
1123        case FBIOPUTCMAP:
1124                if (copy_from_user(&cmap, argp, sizeof(cmap)))
1125                        return -EFAULT;
1126                ret = fb_set_user_cmap(&cmap, info);
1127                break;
1128        case FBIOGETCMAP:
1129                if (copy_from_user(&cmap, argp, sizeof(cmap)))
1130                        return -EFAULT;
1131                lock_fb_info(info);
1132                cmap_from = info->cmap;
1133                unlock_fb_info(info);
1134                ret = fb_cmap_to_user(&cmap_from, &cmap);
1135                break;
1136        case FBIOPAN_DISPLAY:
1137                if (copy_from_user(&var, argp, sizeof(var)))
1138                        return -EFAULT;
1139                console_lock();
1140                lock_fb_info(info);
1141                ret = fb_pan_display(info, &var);
1142                unlock_fb_info(info);
1143                console_unlock();
1144                if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1145                        return -EFAULT;
1146                break;
1147        case FBIO_CURSOR:
1148                ret = -EINVAL;
1149                break;
1150        case FBIOGET_CON2FBMAP:
1151                ret = fbcon_get_con2fb_map_ioctl(argp);
1152                break;
1153        case FBIOPUT_CON2FBMAP:
1154                ret = fbcon_set_con2fb_map_ioctl(argp);
1155                break;
1156        case FBIOBLANK:
1157                console_lock();
1158                lock_fb_info(info);
1159                ret = fb_blank(info, arg);
1160                /* might again call into fb_blank */
1161                fbcon_fb_blanked(info, arg);
1162                unlock_fb_info(info);
1163                console_unlock();
1164                break;
1165        default:
1166                lock_fb_info(info);
1167                fb = info->fbops;
1168                if (fb->fb_ioctl)
1169                        ret = fb->fb_ioctl(info, cmd, arg);
1170                else
1171                        ret = -ENOTTY;
1172                unlock_fb_info(info);
1173        }
1174        return ret;
1175}
1176
1177static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1178{
1179        struct fb_info *info = file_fb_info(file);
1180
1181        if (!info)
1182                return -ENODEV;
1183        return do_fb_ioctl(info, cmd, arg);
1184}
1185
1186#ifdef CONFIG_COMPAT
1187struct fb_fix_screeninfo32 {
1188        char                    id[16];
1189        compat_caddr_t          smem_start;
1190        u32                     smem_len;
1191        u32                     type;
1192        u32                     type_aux;
1193        u32                     visual;
1194        u16                     xpanstep;
1195        u16                     ypanstep;
1196        u16                     ywrapstep;
1197        u32                     line_length;
1198        compat_caddr_t          mmio_start;
1199        u32                     mmio_len;
1200        u32                     accel;
1201        u16                     reserved[3];
1202};
1203
1204struct fb_cmap32 {
1205        u32                     start;
1206        u32                     len;
1207        compat_caddr_t  red;
1208        compat_caddr_t  green;
1209        compat_caddr_t  blue;
1210        compat_caddr_t  transp;
1211};
1212
1213static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1214                          unsigned long arg)
1215{
1216        struct fb_cmap32 cmap32;
1217        struct fb_cmap cmap_from;
1218        struct fb_cmap_user cmap;
1219
1220        if (copy_from_user(&cmap32, compat_ptr(arg), sizeof(cmap32)))
1221                return -EFAULT;
1222
1223        cmap = (struct fb_cmap_user) {
1224                .start  = cmap32.start,
1225                .len    = cmap32.len,
1226                .red    = compat_ptr(cmap32.red),
1227                .green  = compat_ptr(cmap32.green),
1228                .blue   = compat_ptr(cmap32.blue),
1229                .transp = compat_ptr(cmap32.transp),
1230        };
1231
1232        if (cmd == FBIOPUTCMAP)
1233                return fb_set_user_cmap(&cmap, info);
1234
1235        lock_fb_info(info);
1236        cmap_from = info->cmap;
1237        unlock_fb_info(info);
1238
1239        return fb_cmap_to_user(&cmap_from, &cmap);
1240}
1241
1242static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1243                                  struct fb_fix_screeninfo32 __user *fix32)
1244{
1245        __u32 data;
1246        int err;
1247
1248        err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1249
1250        data = (__u32) (unsigned long) fix->smem_start;
1251        err |= put_user(data, &fix32->smem_start);
1252
1253        err |= put_user(fix->smem_len, &fix32->smem_len);
1254        err |= put_user(fix->type, &fix32->type);
1255        err |= put_user(fix->type_aux, &fix32->type_aux);
1256        err |= put_user(fix->visual, &fix32->visual);
1257        err |= put_user(fix->xpanstep, &fix32->xpanstep);
1258        err |= put_user(fix->ypanstep, &fix32->ypanstep);
1259        err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1260        err |= put_user(fix->line_length, &fix32->line_length);
1261
1262        data = (__u32) (unsigned long) fix->mmio_start;
1263        err |= put_user(data, &fix32->mmio_start);
1264
1265        err |= put_user(fix->mmio_len, &fix32->mmio_len);
1266        err |= put_user(fix->accel, &fix32->accel);
1267        err |= copy_to_user(fix32->reserved, fix->reserved,
1268                            sizeof(fix->reserved));
1269
1270        if (err)
1271                return -EFAULT;
1272        return 0;
1273}
1274
1275static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1276                              unsigned long arg)
1277{
1278        struct fb_fix_screeninfo fix;
1279
1280        lock_fb_info(info);
1281        fix = info->fix;
1282        if (info->flags & FBINFO_HIDE_SMEM_START)
1283                fix.smem_start = 0;
1284        unlock_fb_info(info);
1285        return do_fscreeninfo_to_user(&fix, compat_ptr(arg));
1286}
1287
1288static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1289                            unsigned long arg)
1290{
1291        struct fb_info *info = file_fb_info(file);
1292        const struct fb_ops *fb;
1293        long ret = -ENOIOCTLCMD;
1294
1295        if (!info)
1296                return -ENODEV;
1297        fb = info->fbops;
1298        switch(cmd) {
1299        case FBIOGET_VSCREENINFO:
1300        case FBIOPUT_VSCREENINFO:
1301        case FBIOPAN_DISPLAY:
1302        case FBIOGET_CON2FBMAP:
1303        case FBIOPUT_CON2FBMAP:
1304                arg = (unsigned long) compat_ptr(arg);
1305                fallthrough;
1306        case FBIOBLANK:
1307                ret = do_fb_ioctl(info, cmd, arg);
1308                break;
1309
1310        case FBIOGET_FSCREENINFO:
1311                ret = fb_get_fscreeninfo(info, cmd, arg);
1312                break;
1313
1314        case FBIOGETCMAP:
1315        case FBIOPUTCMAP:
1316                ret = fb_getput_cmap(info, cmd, arg);
1317                break;
1318
1319        default:
1320                if (fb->fb_compat_ioctl)
1321                        ret = fb->fb_compat_ioctl(info, cmd, arg);
1322                break;
1323        }
1324        return ret;
1325}
1326#endif
1327
1328static int
1329fb_mmap(struct file *file, struct vm_area_struct * vma)
1330{
1331        struct fb_info *info = file_fb_info(file);
1332        int (*fb_mmap_fn)(struct fb_info *info, struct vm_area_struct *vma);
1333        unsigned long mmio_pgoff;
1334        unsigned long start;
1335        u32 len;
1336
1337        if (!info)
1338                return -ENODEV;
1339        mutex_lock(&info->mm_lock);
1340
1341        fb_mmap_fn = info->fbops->fb_mmap;
1342
1343#if IS_ENABLED(CONFIG_FB_DEFERRED_IO)
1344        if (info->fbdefio)
1345                fb_mmap_fn = fb_deferred_io_mmap;
1346#endif
1347
1348        if (fb_mmap_fn) {
1349                int res;
1350
1351                /*
1352                 * The framebuffer needs to be accessed decrypted, be sure
1353                 * SME protection is removed ahead of the call
1354                 */
1355                vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1356                res = fb_mmap_fn(info, vma);
1357                mutex_unlock(&info->mm_lock);
1358                return res;
1359        }
1360
1361        /*
1362         * Ugh. This can be either the frame buffer mapping, or
1363         * if pgoff points past it, the mmio mapping.
1364         */
1365        start = info->fix.smem_start;
1366        len = info->fix.smem_len;
1367        mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1368        if (vma->vm_pgoff >= mmio_pgoff) {
1369                if (info->var.accel_flags) {
1370                        mutex_unlock(&info->mm_lock);
1371                        return -EINVAL;
1372                }
1373
1374                vma->vm_pgoff -= mmio_pgoff;
1375                start = info->fix.mmio_start;
1376                len = info->fix.mmio_len;
1377        }
1378        mutex_unlock(&info->mm_lock);
1379
1380        vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1381        fb_pgprotect(file, vma, start);
1382
1383        return vm_iomap_memory(vma, start, len);
1384}
1385
1386static int
1387fb_open(struct inode *inode, struct file *file)
1388__acquires(&info->lock)
1389__releases(&info->lock)
1390{
1391        int fbidx = iminor(inode);
1392        struct fb_info *info;
1393        int res = 0;
1394
1395        info = get_fb_info(fbidx);
1396        if (!info) {
1397                request_module("fb%d", fbidx);
1398                info = get_fb_info(fbidx);
1399                if (!info)
1400                        return -ENODEV;
1401        }
1402        if (IS_ERR(info))
1403                return PTR_ERR(info);
1404
1405        lock_fb_info(info);
1406        if (!try_module_get(info->fbops->owner)) {
1407                res = -ENODEV;
1408                goto out;
1409        }
1410        file->private_data = info;
1411        if (info->fbops->fb_open) {
1412                res = info->fbops->fb_open(info,1);
1413                if (res)
1414                        module_put(info->fbops->owner);
1415        }
1416#ifdef CONFIG_FB_DEFERRED_IO
1417        if (info->fbdefio)
1418                fb_deferred_io_open(info, inode, file);
1419#endif
1420out:
1421        unlock_fb_info(info);
1422        if (res)
1423                put_fb_info(info);
1424        return res;
1425}
1426
1427static int
1428fb_release(struct inode *inode, struct file *file)
1429__acquires(&info->lock)
1430__releases(&info->lock)
1431{
1432        struct fb_info * const info = file->private_data;
1433
1434        lock_fb_info(info);
1435        if (info->fbops->fb_release)
1436                info->fbops->fb_release(info,1);
1437        module_put(info->fbops->owner);
1438        unlock_fb_info(info);
1439        put_fb_info(info);
1440        return 0;
1441}
1442
1443#if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU)
1444unsigned long get_fb_unmapped_area(struct file *filp,
1445                                   unsigned long addr, unsigned long len,
1446                                   unsigned long pgoff, unsigned long flags)
1447{
1448        struct fb_info * const info = filp->private_data;
1449        unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
1450
1451        if (pgoff > fb_size || len > fb_size - pgoff)
1452                return -EINVAL;
1453
1454        return (unsigned long)info->screen_base + pgoff;
1455}
1456#endif
1457
1458static const struct file_operations fb_fops = {
1459        .owner =        THIS_MODULE,
1460        .read =         fb_read,
1461        .write =        fb_write,
1462        .unlocked_ioctl = fb_ioctl,
1463#ifdef CONFIG_COMPAT
1464        .compat_ioctl = fb_compat_ioctl,
1465#endif
1466        .mmap =         fb_mmap,
1467        .open =         fb_open,
1468        .release =      fb_release,
1469#if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \
1470        (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \
1471         !defined(CONFIG_MMU))
1472        .get_unmapped_area = get_fb_unmapped_area,
1473#endif
1474#ifdef CONFIG_FB_DEFERRED_IO
1475        .fsync =        fb_deferred_io_fsync,
1476#endif
1477        .llseek =       default_llseek,
1478};
1479
1480struct class *fb_class;
1481EXPORT_SYMBOL(fb_class);
1482
1483static int fb_check_foreignness(struct fb_info *fi)
1484{
1485        const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1486
1487        fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1488
1489#ifdef __BIG_ENDIAN
1490        fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1491#else
1492        fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1493#endif /* __BIG_ENDIAN */
1494
1495        if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1496                pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1497                       "support this framebuffer\n", fi->fix.id);
1498                return -ENOSYS;
1499        } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1500                pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1501                       "support this framebuffer\n", fi->fix.id);
1502                return -ENOSYS;
1503        }
1504
1505        return 0;
1506}
1507
1508static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1509{
1510        /* is the generic aperture base the same as the HW one */
1511        if (gen->base == hw->base)
1512                return true;
1513        /* is the generic aperture base inside the hw base->hw base+size */
1514        if (gen->base > hw->base && gen->base < hw->base + hw->size)
1515                return true;
1516        return false;
1517}
1518
1519static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1520                                    struct apertures_struct *hwa)
1521{
1522        int i, j;
1523        if (!hwa || !gena)
1524                return false;
1525
1526        for (i = 0; i < hwa->count; ++i) {
1527                struct aperture *h = &hwa->ranges[i];
1528                for (j = 0; j < gena->count; ++j) {
1529                        struct aperture *g = &gena->ranges[j];
1530                        printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1531                                (unsigned long long)g->base,
1532                                (unsigned long long)g->size,
1533                                (unsigned long long)h->base,
1534                                (unsigned long long)h->size);
1535                        if (apertures_overlap(g, h))
1536                                return true;
1537                }
1538        }
1539
1540        return false;
1541}
1542
1543static void do_unregister_framebuffer(struct fb_info *fb_info);
1544
1545#define VGA_FB_PHYS 0xA0000
1546static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
1547                                               const char *name, bool primary)
1548{
1549        int i;
1550
1551        /* check all firmware fbs and kick off if the base addr overlaps */
1552        for_each_registered_fb(i) {
1553                struct apertures_struct *gen_aper;
1554
1555                if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1556                        continue;
1557
1558                gen_aper = registered_fb[i]->apertures;
1559                if (fb_do_apertures_overlap(gen_aper, a) ||
1560                        (primary && gen_aper && gen_aper->count &&
1561                         gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1562
1563                        printk(KERN_INFO "fb%d: switching to %s from %s\n",
1564                               i, name, registered_fb[i]->fix.id);
1565                        do_unregister_framebuffer(registered_fb[i]);
1566                }
1567        }
1568}
1569
1570static bool lockless_register_fb;
1571module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
1572MODULE_PARM_DESC(lockless_register_fb,
1573        "Lockless framebuffer registration for debugging [default=off]");
1574
1575static int do_register_framebuffer(struct fb_info *fb_info)
1576{
1577        int i, ret;
1578        struct fb_videomode mode;
1579
1580        if (fb_check_foreignness(fb_info))
1581                return -ENOSYS;
1582
1583        do_remove_conflicting_framebuffers(fb_info->apertures,
1584                                           fb_info->fix.id,
1585                                           fb_is_primary_device(fb_info));
1586
1587        if (num_registered_fb == FB_MAX)
1588                return -ENXIO;
1589
1590        num_registered_fb++;
1591        for (i = 0 ; i < FB_MAX; i++)
1592                if (!registered_fb[i])
1593                        break;
1594        fb_info->node = i;
1595        atomic_set(&fb_info->count, 1);
1596        mutex_init(&fb_info->lock);
1597        mutex_init(&fb_info->mm_lock);
1598
1599        fb_info->dev = device_create(fb_class, fb_info->device,
1600                                     MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1601        if (IS_ERR(fb_info->dev)) {
1602                /* Not fatal */
1603                printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1604                fb_info->dev = NULL;
1605        } else
1606                fb_init_device(fb_info);
1607
1608        if (fb_info->pixmap.addr == NULL) {
1609                fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1610                if (fb_info->pixmap.addr) {
1611                        fb_info->pixmap.size = FBPIXMAPSIZE;
1612                        fb_info->pixmap.buf_align = 1;
1613                        fb_info->pixmap.scan_align = 1;
1614                        fb_info->pixmap.access_align = 32;
1615                        fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1616                }
1617        }
1618        fb_info->pixmap.offset = 0;
1619
1620        if (!fb_info->pixmap.blit_x)
1621                fb_info->pixmap.blit_x = ~(u32)0;
1622
1623        if (!fb_info->pixmap.blit_y)
1624                fb_info->pixmap.blit_y = ~(u32)0;
1625
1626        if (!fb_info->modelist.prev || !fb_info->modelist.next)
1627                INIT_LIST_HEAD(&fb_info->modelist);
1628
1629        if (fb_info->skip_vt_switch)
1630                pm_vt_switch_required(fb_info->dev, false);
1631        else
1632                pm_vt_switch_required(fb_info->dev, true);
1633
1634        fb_var_to_videomode(&mode, &fb_info->var);
1635        fb_add_videomode(&mode, &fb_info->modelist);
1636        registered_fb[i] = fb_info;
1637
1638#ifdef CONFIG_GUMSTIX_AM200EPD
1639        {
1640                struct fb_event event;
1641                event.info = fb_info;
1642                fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1643        }
1644#endif
1645
1646        if (!lockless_register_fb)
1647                console_lock();
1648        else
1649                atomic_inc(&ignore_console_lock_warning);
1650        lock_fb_info(fb_info);
1651        ret = fbcon_fb_registered(fb_info);
1652        unlock_fb_info(fb_info);
1653
1654        if (!lockless_register_fb)
1655                console_unlock();
1656        else
1657                atomic_dec(&ignore_console_lock_warning);
1658        return ret;
1659}
1660
1661static void unbind_console(struct fb_info *fb_info)
1662{
1663        int i = fb_info->node;
1664
1665        if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1666                return;
1667
1668        console_lock();
1669        lock_fb_info(fb_info);
1670        fbcon_fb_unbind(fb_info);
1671        unlock_fb_info(fb_info);
1672        console_unlock();
1673}
1674
1675static void unlink_framebuffer(struct fb_info *fb_info)
1676{
1677        int i;
1678
1679        i = fb_info->node;
1680        if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1681                return;
1682
1683        if (!fb_info->dev)
1684                return;
1685
1686        device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1687
1688        pm_vt_switch_unregister(fb_info->dev);
1689
1690        unbind_console(fb_info);
1691
1692        fb_info->dev = NULL;
1693}
1694
1695static void do_unregister_framebuffer(struct fb_info *fb_info)
1696{
1697        unlink_framebuffer(fb_info);
1698        if (fb_info->pixmap.addr &&
1699            (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1700                kfree(fb_info->pixmap.addr);
1701        fb_destroy_modelist(&fb_info->modelist);
1702        registered_fb[fb_info->node] = NULL;
1703        num_registered_fb--;
1704        fb_cleanup_device(fb_info);
1705#ifdef CONFIG_GUMSTIX_AM200EPD
1706        {
1707                struct fb_event event;
1708                event.info = fb_info;
1709                fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1710        }
1711#endif
1712        console_lock();
1713        fbcon_fb_unregistered(fb_info);
1714        console_unlock();
1715
1716        /* this may free fb info */
1717        put_fb_info(fb_info);
1718}
1719
1720/**
1721 * remove_conflicting_framebuffers - remove firmware-configured framebuffers
1722 * @a: memory range, users of which are to be removed
1723 * @name: requesting driver name
1724 * @primary: also kick vga16fb if present
1725 *
1726 * This function removes framebuffer devices (initialized by firmware/bootloader)
1727 * which use memory range described by @a. If @a is NULL all such devices are
1728 * removed.
1729 */
1730int remove_conflicting_framebuffers(struct apertures_struct *a,
1731                                    const char *name, bool primary)
1732{
1733        bool do_free = false;
1734
1735        if (!a) {
1736                a = alloc_apertures(1);
1737                if (!a)
1738                        return -ENOMEM;
1739
1740                a->ranges[0].base = 0;
1741                a->ranges[0].size = ~0;
1742                do_free = true;
1743        }
1744
1745        mutex_lock(&registration_lock);
1746        do_remove_conflicting_framebuffers(a, name, primary);
1747        mutex_unlock(&registration_lock);
1748
1749        if (do_free)
1750                kfree(a);
1751
1752        return 0;
1753}
1754EXPORT_SYMBOL(remove_conflicting_framebuffers);
1755
1756/**
1757 * remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices
1758 * @pdev: PCI device
1759 * @name: requesting driver name
1760 *
1761 * This function removes framebuffer devices (eg. initialized by firmware)
1762 * using memory range configured for any of @pdev's memory bars.
1763 *
1764 * The function assumes that PCI device with shadowed ROM drives a primary
1765 * display and so kicks out vga16fb.
1766 */
1767int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, const char *name)
1768{
1769        struct apertures_struct *ap;
1770        bool primary = false;
1771        int err, idx, bar;
1772
1773        for (idx = 0, bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
1774                if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
1775                        continue;
1776                idx++;
1777        }
1778
1779        ap = alloc_apertures(idx);
1780        if (!ap)
1781                return -ENOMEM;
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                ap->ranges[idx].base = pci_resource_start(pdev, bar);
1787                ap->ranges[idx].size = pci_resource_len(pdev, bar);
1788                pci_dbg(pdev, "%s: bar %d: 0x%lx -> 0x%lx\n", __func__, bar,
1789                        (unsigned long)pci_resource_start(pdev, bar),
1790                        (unsigned long)pci_resource_end(pdev, bar));
1791                idx++;
1792        }
1793
1794#ifdef CONFIG_X86
1795        primary = pdev->resource[PCI_ROM_RESOURCE].flags &
1796                                        IORESOURCE_ROM_SHADOW;
1797#endif
1798        err = remove_conflicting_framebuffers(ap, name, primary);
1799        kfree(ap);
1800        return err;
1801}
1802EXPORT_SYMBOL(remove_conflicting_pci_framebuffers);
1803
1804/**
1805 *      register_framebuffer - registers a frame buffer device
1806 *      @fb_info: frame buffer info structure
1807 *
1808 *      Registers a frame buffer device @fb_info.
1809 *
1810 *      Returns negative errno on error, or zero for success.
1811 *
1812 */
1813int
1814register_framebuffer(struct fb_info *fb_info)
1815{
1816        int ret;
1817
1818        mutex_lock(&registration_lock);
1819        ret = do_register_framebuffer(fb_info);
1820        mutex_unlock(&registration_lock);
1821
1822        return ret;
1823}
1824EXPORT_SYMBOL(register_framebuffer);
1825
1826/**
1827 *      unregister_framebuffer - releases a frame buffer device
1828 *      @fb_info: frame buffer info structure
1829 *
1830 *      Unregisters a frame buffer device @fb_info.
1831 *
1832 *      Returns negative errno on error, or zero for success.
1833 *
1834 *      This function will also notify the framebuffer console
1835 *      to release the driver.
1836 *
1837 *      This is meant to be called within a driver's module_exit()
1838 *      function. If this is called outside module_exit(), ensure
1839 *      that the driver implements fb_open() and fb_release() to
1840 *      check that no processes are using the device.
1841 */
1842void
1843unregister_framebuffer(struct fb_info *fb_info)
1844{
1845        mutex_lock(&registration_lock);
1846        do_unregister_framebuffer(fb_info);
1847        mutex_unlock(&registration_lock);
1848}
1849EXPORT_SYMBOL(unregister_framebuffer);
1850
1851/**
1852 *      fb_set_suspend - low level driver signals suspend
1853 *      @info: framebuffer affected
1854 *      @state: 0 = resuming, !=0 = suspending
1855 *
1856 *      This is meant to be used by low level drivers to
1857 *      signal suspend/resume to the core & clients.
1858 *      It must be called with the console semaphore held
1859 */
1860void fb_set_suspend(struct fb_info *info, int state)
1861{
1862        WARN_CONSOLE_UNLOCKED();
1863
1864        if (state) {
1865                fbcon_suspended(info);
1866                info->state = FBINFO_STATE_SUSPENDED;
1867        } else {
1868                info->state = FBINFO_STATE_RUNNING;
1869                fbcon_resumed(info);
1870        }
1871}
1872EXPORT_SYMBOL(fb_set_suspend);
1873
1874/**
1875 *      fbmem_init - init frame buffer subsystem
1876 *
1877 *      Initialize the frame buffer subsystem.
1878 *
1879 *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1880 *
1881 */
1882
1883static int __init
1884fbmem_init(void)
1885{
1886        int ret;
1887
1888        if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops))
1889                return -ENOMEM;
1890
1891        ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
1892        if (ret) {
1893                printk("unable to get major %d for fb devs\n", FB_MAJOR);
1894                goto err_chrdev;
1895        }
1896
1897        fb_class = class_create(THIS_MODULE, "graphics");
1898        if (IS_ERR(fb_class)) {
1899                ret = PTR_ERR(fb_class);
1900                pr_warn("Unable to create fb class; errno = %d\n", ret);
1901                fb_class = NULL;
1902                goto err_class;
1903        }
1904
1905        fb_console_init();
1906
1907        return 0;
1908
1909err_class:
1910        unregister_chrdev(FB_MAJOR, "fb");
1911err_chrdev:
1912        remove_proc_entry("fb", NULL);
1913        return ret;
1914}
1915
1916#ifdef MODULE
1917module_init(fbmem_init);
1918static void __exit
1919fbmem_exit(void)
1920{
1921        fb_console_exit();
1922
1923        remove_proc_entry("fb", NULL);
1924        class_destroy(fb_class);
1925        unregister_chrdev(FB_MAJOR, "fb");
1926}
1927
1928module_exit(fbmem_exit);
1929MODULE_LICENSE("GPL");
1930MODULE_DESCRIPTION("Framebuffer base");
1931#else
1932subsys_initcall(fbmem_init);
1933#endif
1934
1935int fb_new_modelist(struct fb_info *info)
1936{
1937        struct fb_var_screeninfo var = info->var;
1938        struct list_head *pos, *n;
1939        struct fb_modelist *modelist;
1940        struct fb_videomode *m, mode;
1941        int err;
1942
1943        list_for_each_safe(pos, n, &info->modelist) {
1944                modelist = list_entry(pos, struct fb_modelist, list);
1945                m = &modelist->mode;
1946                fb_videomode_to_var(&var, m);
1947                var.activate = FB_ACTIVATE_TEST;
1948                err = fb_set_var(info, &var);
1949                fb_var_to_videomode(&mode, &var);
1950                if (err || !fb_mode_is_equal(m, &mode)) {
1951                        list_del(pos);
1952                        kfree(pos);
1953                }
1954        }
1955
1956        if (list_empty(&info->modelist))
1957                return 1;
1958
1959        fbcon_new_modelist(info);
1960
1961        return 0;
1962}
1963
1964MODULE_LICENSE("GPL");
1965