Merge git://www.linux-watchdog.org/linux-watchdog
[sfrench/cifs-2.6.git] / drivers / video / fbdev / core / fbmem.c
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/mem_encrypt.h>
36
37 #include <asm/fb.h>
38
39
40     /*
41      *  Frame buffer device initialization and setup routines
42      */
43
44 #define FBPIXMAPSIZE    (1024 * 8)
45
46 static DEFINE_MUTEX(registration_lock);
47
48 struct fb_info *registered_fb[FB_MAX] __read_mostly;
49 EXPORT_SYMBOL(registered_fb);
50
51 int num_registered_fb __read_mostly;
52 EXPORT_SYMBOL(num_registered_fb);
53
54 static struct fb_info *get_fb_info(unsigned int idx)
55 {
56         struct fb_info *fb_info;
57
58         if (idx >= FB_MAX)
59                 return ERR_PTR(-ENODEV);
60
61         mutex_lock(&registration_lock);
62         fb_info = registered_fb[idx];
63         if (fb_info)
64                 atomic_inc(&fb_info->count);
65         mutex_unlock(&registration_lock);
66
67         return fb_info;
68 }
69
70 static void put_fb_info(struct fb_info *fb_info)
71 {
72         if (!atomic_dec_and_test(&fb_info->count))
73                 return;
74         if (fb_info->fbops->fb_destroy)
75                 fb_info->fbops->fb_destroy(fb_info);
76 }
77
78 int lock_fb_info(struct fb_info *info)
79 {
80         mutex_lock(&info->lock);
81         if (!info->fbops) {
82                 mutex_unlock(&info->lock);
83                 return 0;
84         }
85         return 1;
86 }
87 EXPORT_SYMBOL(lock_fb_info);
88
89 /*
90  * Helpers
91  */
92
93 int fb_get_color_depth(struct fb_var_screeninfo *var,
94                        struct fb_fix_screeninfo *fix)
95 {
96         int depth = 0;
97
98         if (fix->visual == FB_VISUAL_MONO01 ||
99             fix->visual == FB_VISUAL_MONO10)
100                 depth = 1;
101         else {
102                 if (var->green.length == var->blue.length &&
103                     var->green.length == var->red.length &&
104                     var->green.offset == var->blue.offset &&
105                     var->green.offset == var->red.offset)
106                         depth = var->green.length;
107                 else
108                         depth = var->green.length + var->red.length +
109                                 var->blue.length;
110         }
111
112         return depth;
113 }
114 EXPORT_SYMBOL(fb_get_color_depth);
115
116 /*
117  * Data padding functions.
118  */
119 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
120 {
121         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
122 }
123 EXPORT_SYMBOL(fb_pad_aligned_buffer);
124
125 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
126                                 u32 shift_high, u32 shift_low, u32 mod)
127 {
128         u8 mask = (u8) (0xfff << shift_high), tmp;
129         int i, j;
130
131         for (i = height; i--; ) {
132                 for (j = 0; j < idx; j++) {
133                         tmp = dst[j];
134                         tmp &= mask;
135                         tmp |= *src >> shift_low;
136                         dst[j] = tmp;
137                         tmp = *src << shift_high;
138                         dst[j+1] = tmp;
139                         src++;
140                 }
141                 tmp = dst[idx];
142                 tmp &= mask;
143                 tmp |= *src >> shift_low;
144                 dst[idx] = tmp;
145                 if (shift_high < mod) {
146                         tmp = *src << shift_high;
147                         dst[idx+1] = tmp;
148                 }
149                 src++;
150                 dst += d_pitch;
151         }
152 }
153 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
154
155 /*
156  * we need to lock this section since fb_cursor
157  * may use fb_imageblit()
158  */
159 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
160 {
161         u32 align = buf->buf_align - 1, offset;
162         char *addr = buf->addr;
163
164         /* If IO mapped, we need to sync before access, no sharing of
165          * the pixmap is done
166          */
167         if (buf->flags & FB_PIXMAP_IO) {
168                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
169                         info->fbops->fb_sync(info);
170                 return addr;
171         }
172
173         /* See if we fit in the remaining pixmap space */
174         offset = buf->offset + align;
175         offset &= ~align;
176         if (offset + size > buf->size) {
177                 /* We do not fit. In order to be able to re-use the buffer,
178                  * we must ensure no asynchronous DMA'ing or whatever operation
179                  * is in progress, we sync for that.
180                  */
181                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
182                         info->fbops->fb_sync(info);
183                 offset = 0;
184         }
185         buf->offset = offset + size;
186         addr += offset;
187
188         return addr;
189 }
190 EXPORT_SYMBOL(fb_get_buffer_offset);
191
192 #ifdef CONFIG_LOGO
193
194 static inline unsigned safe_shift(unsigned d, int n)
195 {
196         return n < 0 ? d >> -n : d << n;
197 }
198
199 static void fb_set_logocmap(struct fb_info *info,
200                                    const struct linux_logo *logo)
201 {
202         struct fb_cmap palette_cmap;
203         u16 palette_green[16];
204         u16 palette_blue[16];
205         u16 palette_red[16];
206         int i, j, n;
207         const unsigned char *clut = logo->clut;
208
209         palette_cmap.start = 0;
210         palette_cmap.len = 16;
211         palette_cmap.red = palette_red;
212         palette_cmap.green = palette_green;
213         palette_cmap.blue = palette_blue;
214         palette_cmap.transp = NULL;
215
216         for (i = 0; i < logo->clutsize; i += n) {
217                 n = logo->clutsize - i;
218                 /* palette_cmap provides space for only 16 colors at once */
219                 if (n > 16)
220                         n = 16;
221                 palette_cmap.start = 32 + i;
222                 palette_cmap.len = n;
223                 for (j = 0; j < n; ++j) {
224                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
225                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
226                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
227                         clut += 3;
228                 }
229                 fb_set_cmap(&palette_cmap, info);
230         }
231 }
232
233 static void  fb_set_logo_truepalette(struct fb_info *info,
234                                             const struct linux_logo *logo,
235                                             u32 *palette)
236 {
237         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
238         unsigned char redmask, greenmask, bluemask;
239         int redshift, greenshift, blueshift;
240         int i;
241         const unsigned char *clut = logo->clut;
242
243         /*
244          * We have to create a temporary palette since console palette is only
245          * 16 colors long.
246          */
247         /* Bug: Doesn't obey msb_right ... (who needs that?) */
248         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
249         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
250         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
251         redshift   = info->var.red.offset   - (8 - info->var.red.length);
252         greenshift = info->var.green.offset - (8 - info->var.green.length);
253         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
254
255         for ( i = 0; i < logo->clutsize; i++) {
256                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
257                                  safe_shift((clut[1] & greenmask), greenshift) |
258                                  safe_shift((clut[2] & bluemask), blueshift));
259                 clut += 3;
260         }
261 }
262
263 static void fb_set_logo_directpalette(struct fb_info *info,
264                                              const struct linux_logo *logo,
265                                              u32 *palette)
266 {
267         int redshift, greenshift, blueshift;
268         int i;
269
270         redshift = info->var.red.offset;
271         greenshift = info->var.green.offset;
272         blueshift = info->var.blue.offset;
273
274         for (i = 32; i < 32 + logo->clutsize; i++)
275                 palette[i] = i << redshift | i << greenshift | i << blueshift;
276 }
277
278 static void fb_set_logo(struct fb_info *info,
279                                const struct linux_logo *logo, u8 *dst,
280                                int depth)
281 {
282         int i, j, k;
283         const u8 *src = logo->data;
284         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
285         u8 fg = 1, d;
286
287         switch (fb_get_color_depth(&info->var, &info->fix)) {
288         case 1:
289                 fg = 1;
290                 break;
291         case 2:
292                 fg = 3;
293                 break;
294         default:
295                 fg = 7;
296                 break;
297         }
298
299         if (info->fix.visual == FB_VISUAL_MONO01 ||
300             info->fix.visual == FB_VISUAL_MONO10)
301                 fg = ~((u8) (0xfff << info->var.green.length));
302
303         switch (depth) {
304         case 4:
305                 for (i = 0; i < logo->height; i++)
306                         for (j = 0; j < logo->width; src++) {
307                                 *dst++ = *src >> 4;
308                                 j++;
309                                 if (j < logo->width) {
310                                         *dst++ = *src & 0x0f;
311                                         j++;
312                                 }
313                         }
314                 break;
315         case 1:
316                 for (i = 0; i < logo->height; i++) {
317                         for (j = 0; j < logo->width; src++) {
318                                 d = *src ^ xor;
319                                 for (k = 7; k >= 0; k--) {
320                                         *dst++ = ((d >> k) & 1) ? fg : 0;
321                                         j++;
322                                 }
323                         }
324                 }
325                 break;
326         }
327 }
328
329 /*
330  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
331  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
332  * the visual format and color depth of the framebuffer, the DAC, the
333  * pseudo_palette, and the logo data will be adjusted accordingly.
334  *
335  * Case 1 - linux_logo_clut224:
336  * Color exceeds the number of console colors (16), thus we set the hardware DAC
337  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
338  *
339  * For visuals that require color info from the pseudo_palette, we also construct
340  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
341  * will be set.
342  *
343  * Case 2 - linux_logo_vga16:
344  * The number of colors just matches the console colors, thus there is no need
345  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
346  * each byte contains color information for two pixels (upper and lower nibble).
347  * To be consistent with fb_imageblit() usage, we therefore separate the two
348  * nibbles into separate bytes. The "depth" flag will be set to 4.
349  *
350  * Case 3 - linux_logo_mono:
351  * This is similar with Case 2.  Each byte contains information for 8 pixels.
352  * We isolate each bit and expand each into a byte. The "depth" flag will
353  * be set to 1.
354  */
355 static struct logo_data {
356         int depth;
357         int needs_directpalette;
358         int needs_truepalette;
359         int needs_cmapreset;
360         const struct linux_logo *logo;
361 } fb_logo __read_mostly;
362
363 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
364 {
365         u32 size = width * height, i;
366
367         out += size - 1;
368
369         for (i = size; i--; )
370                 *out-- = *in++;
371 }
372
373 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
374 {
375         int i, j, h = height - 1;
376
377         for (i = 0; i < height; i++)
378                 for (j = 0; j < width; j++)
379                                 out[height * j + h - i] = *in++;
380 }
381
382 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
383 {
384         int i, j, w = width - 1;
385
386         for (i = 0; i < height; i++)
387                 for (j = 0; j < width; j++)
388                         out[height * (w - j) + i] = *in++;
389 }
390
391 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
392                            struct fb_image *image, int rotate)
393 {
394         u32 tmp;
395
396         if (rotate == FB_ROTATE_UD) {
397                 fb_rotate_logo_ud(image->data, dst, image->width,
398                                   image->height);
399                 image->dx = info->var.xres - image->width - image->dx;
400                 image->dy = info->var.yres - image->height - image->dy;
401         } else if (rotate == FB_ROTATE_CW) {
402                 fb_rotate_logo_cw(image->data, dst, image->width,
403                                   image->height);
404                 tmp = image->width;
405                 image->width = image->height;
406                 image->height = tmp;
407                 tmp = image->dy;
408                 image->dy = image->dx;
409                 image->dx = info->var.xres - image->width - tmp;
410         } else if (rotate == FB_ROTATE_CCW) {
411                 fb_rotate_logo_ccw(image->data, dst, image->width,
412                                    image->height);
413                 tmp = image->width;
414                 image->width = image->height;
415                 image->height = tmp;
416                 tmp = image->dx;
417                 image->dx = image->dy;
418                 image->dy = info->var.yres - image->height - tmp;
419         }
420
421         image->data = dst;
422 }
423
424 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
425                             int rotate, unsigned int num)
426 {
427         unsigned int x;
428
429         if (rotate == FB_ROTATE_UR) {
430                 for (x = 0;
431                      x < num && image->dx + image->width <= info->var.xres;
432                      x++) {
433                         info->fbops->fb_imageblit(info, image);
434                         image->dx += image->width + 8;
435                 }
436         } else if (rotate == FB_ROTATE_UD) {
437                 for (x = 0; x < num; 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                 for (x = 0; x < num; x++) {
450                         info->fbops->fb_imageblit(info, image);
451                         image->dy -= image->height + 8;
452                 }
453         }
454 }
455
456 static int fb_show_logo_line(struct fb_info *info, int rotate,
457                              const struct linux_logo *logo, int y,
458                              unsigned int n)
459 {
460         u32 *palette = NULL, *saved_pseudo_palette = NULL;
461         unsigned char *logo_new = NULL, *logo_rotate = NULL;
462         struct fb_image image;
463
464         /* Return if the frame buffer is not mapped or suspended */
465         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
466             info->flags & FBINFO_MODULE)
467                 return 0;
468
469         image.depth = 8;
470         image.data = logo->data;
471
472         if (fb_logo.needs_cmapreset)
473                 fb_set_logocmap(info, logo);
474
475         if (fb_logo.needs_truepalette ||
476             fb_logo.needs_directpalette) {
477                 palette = kmalloc(256 * 4, GFP_KERNEL);
478                 if (palette == NULL)
479                         return 0;
480
481                 if (fb_logo.needs_truepalette)
482                         fb_set_logo_truepalette(info, logo, palette);
483                 else
484                         fb_set_logo_directpalette(info, logo, palette);
485
486                 saved_pseudo_palette = info->pseudo_palette;
487                 info->pseudo_palette = palette;
488         }
489
490         if (fb_logo.depth <= 4) {
491                 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
492                 if (logo_new == NULL) {
493                         kfree(palette);
494                         if (saved_pseudo_palette)
495                                 info->pseudo_palette = saved_pseudo_palette;
496                         return 0;
497                 }
498                 image.data = logo_new;
499                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
500         }
501
502         image.dx = 0;
503         image.dy = y;
504         image.width = logo->width;
505         image.height = logo->height;
506
507         if (rotate) {
508                 logo_rotate = kmalloc(logo->width *
509                                       logo->height, GFP_KERNEL);
510                 if (logo_rotate)
511                         fb_rotate_logo(info, logo_rotate, &image, rotate);
512         }
513
514         fb_do_show_logo(info, &image, rotate, n);
515
516         kfree(palette);
517         if (saved_pseudo_palette != NULL)
518                 info->pseudo_palette = saved_pseudo_palette;
519         kfree(logo_new);
520         kfree(logo_rotate);
521         return logo->height;
522 }
523
524
525 #ifdef CONFIG_FB_LOGO_EXTRA
526
527 #define FB_LOGO_EX_NUM_MAX 10
528 static struct logo_data_extra {
529         const struct linux_logo *logo;
530         unsigned int n;
531 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
532 static unsigned int fb_logo_ex_num;
533
534 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
535 {
536         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
537                 return;
538
539         fb_logo_ex[fb_logo_ex_num].logo = logo;
540         fb_logo_ex[fb_logo_ex_num].n = n;
541         fb_logo_ex_num++;
542 }
543
544 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
545                                   unsigned int yres)
546 {
547         unsigned int i;
548
549         /* FIXME: logo_ex supports only truecolor fb. */
550         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
551                 fb_logo_ex_num = 0;
552
553         for (i = 0; i < fb_logo_ex_num; i++) {
554                 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
555                         fb_logo_ex[i].logo = NULL;
556                         continue;
557                 }
558                 height += fb_logo_ex[i].logo->height;
559                 if (height > yres) {
560                         height -= fb_logo_ex[i].logo->height;
561                         fb_logo_ex_num = i;
562                         break;
563                 }
564         }
565         return height;
566 }
567
568 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
569 {
570         unsigned int i;
571
572         for (i = 0; i < fb_logo_ex_num; i++)
573                 y += fb_show_logo_line(info, rotate,
574                                        fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
575
576         return y;
577 }
578
579 #else /* !CONFIG_FB_LOGO_EXTRA */
580
581 static inline int fb_prepare_extra_logos(struct fb_info *info,
582                                          unsigned int height,
583                                          unsigned int yres)
584 {
585         return height;
586 }
587
588 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
589 {
590         return y;
591 }
592
593 #endif /* CONFIG_FB_LOGO_EXTRA */
594
595
596 int fb_prepare_logo(struct fb_info *info, int rotate)
597 {
598         int depth = fb_get_color_depth(&info->var, &info->fix);
599         unsigned int yres;
600
601         memset(&fb_logo, 0, sizeof(struct logo_data));
602
603         if (info->flags & FBINFO_MISC_TILEBLITTING ||
604             info->flags & FBINFO_MODULE)
605                 return 0;
606
607         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
608                 depth = info->var.blue.length;
609                 if (info->var.red.length < depth)
610                         depth = info->var.red.length;
611                 if (info->var.green.length < depth)
612                         depth = info->var.green.length;
613         }
614
615         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
616                 /* assume console colormap */
617                 depth = 4;
618         }
619
620         /* Return if no suitable logo was found */
621         fb_logo.logo = fb_find_logo(depth);
622
623         if (!fb_logo.logo) {
624                 return 0;
625         }
626
627         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
628                 yres = info->var.yres;
629         else
630                 yres = info->var.xres;
631
632         if (fb_logo.logo->height > yres) {
633                 fb_logo.logo = NULL;
634                 return 0;
635         }
636
637         /* What depth we asked for might be different from what we get */
638         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
639                 fb_logo.depth = 8;
640         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
641                 fb_logo.depth = 4;
642         else
643                 fb_logo.depth = 1;
644
645
646         if (fb_logo.depth > 4 && depth > 4) {
647                 switch (info->fix.visual) {
648                 case FB_VISUAL_TRUECOLOR:
649                         fb_logo.needs_truepalette = 1;
650                         break;
651                 case FB_VISUAL_DIRECTCOLOR:
652                         fb_logo.needs_directpalette = 1;
653                         fb_logo.needs_cmapreset = 1;
654                         break;
655                 case FB_VISUAL_PSEUDOCOLOR:
656                         fb_logo.needs_cmapreset = 1;
657                         break;
658                 }
659         }
660
661         return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
662 }
663
664 int fb_show_logo(struct fb_info *info, int rotate)
665 {
666         int y;
667
668         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
669                               num_online_cpus());
670         y = fb_show_extra_logos(info, y, rotate);
671
672         return y;
673 }
674 #else
675 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
676 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
677 #endif /* CONFIG_LOGO */
678 EXPORT_SYMBOL(fb_prepare_logo);
679 EXPORT_SYMBOL(fb_show_logo);
680
681 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
682 {
683         mutex_lock(&registration_lock);
684         return (*pos < FB_MAX) ? pos : NULL;
685 }
686
687 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
688 {
689         (*pos)++;
690         return (*pos < FB_MAX) ? pos : NULL;
691 }
692
693 static void fb_seq_stop(struct seq_file *m, void *v)
694 {
695         mutex_unlock(&registration_lock);
696 }
697
698 static int fb_seq_show(struct seq_file *m, void *v)
699 {
700         int i = *(loff_t *)v;
701         struct fb_info *fi = registered_fb[i];
702
703         if (fi)
704                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
705         return 0;
706 }
707
708 static const struct seq_operations proc_fb_seq_ops = {
709         .start  = fb_seq_start,
710         .next   = fb_seq_next,
711         .stop   = fb_seq_stop,
712         .show   = fb_seq_show,
713 };
714
715 static int proc_fb_open(struct inode *inode, struct file *file)
716 {
717         return seq_open(file, &proc_fb_seq_ops);
718 }
719
720 static const struct file_operations fb_proc_fops = {
721         .owner          = THIS_MODULE,
722         .open           = proc_fb_open,
723         .read           = seq_read,
724         .llseek         = seq_lseek,
725         .release        = seq_release,
726 };
727
728 /*
729  * We hold a reference to the fb_info in file->private_data,
730  * but if the current registered fb has changed, we don't
731  * actually want to use it.
732  *
733  * So look up the fb_info using the inode minor number,
734  * and just verify it against the reference we have.
735  */
736 static struct fb_info *file_fb_info(struct file *file)
737 {
738         struct inode *inode = file_inode(file);
739         int fbidx = iminor(inode);
740         struct fb_info *info = registered_fb[fbidx];
741
742         if (info != file->private_data)
743                 info = NULL;
744         return info;
745 }
746
747 static ssize_t
748 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
749 {
750         unsigned long p = *ppos;
751         struct fb_info *info = file_fb_info(file);
752         u8 *buffer, *dst;
753         u8 __iomem *src;
754         int c, cnt = 0, err = 0;
755         unsigned long total_size;
756
757         if (!info || ! info->screen_base)
758                 return -ENODEV;
759
760         if (info->state != FBINFO_STATE_RUNNING)
761                 return -EPERM;
762
763         if (info->fbops->fb_read)
764                 return info->fbops->fb_read(info, buf, count, ppos);
765         
766         total_size = info->screen_size;
767
768         if (total_size == 0)
769                 total_size = info->fix.smem_len;
770
771         if (p >= total_size)
772                 return 0;
773
774         if (count >= total_size)
775                 count = total_size;
776
777         if (count + p > total_size)
778                 count = total_size - p;
779
780         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
781                          GFP_KERNEL);
782         if (!buffer)
783                 return -ENOMEM;
784
785         src = (u8 __iomem *) (info->screen_base + p);
786
787         if (info->fbops->fb_sync)
788                 info->fbops->fb_sync(info);
789
790         while (count) {
791                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
792                 dst = buffer;
793                 fb_memcpy_fromfb(dst, src, c);
794                 dst += c;
795                 src += c;
796
797                 if (copy_to_user(buf, buffer, c)) {
798                         err = -EFAULT;
799                         break;
800                 }
801                 *ppos += c;
802                 buf += c;
803                 cnt += c;
804                 count -= c;
805         }
806
807         kfree(buffer);
808
809         return (err) ? err : cnt;
810 }
811
812 static ssize_t
813 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
814 {
815         unsigned long p = *ppos;
816         struct fb_info *info = file_fb_info(file);
817         u8 *buffer, *src;
818         u8 __iomem *dst;
819         int c, cnt = 0, err = 0;
820         unsigned long total_size;
821
822         if (!info || !info->screen_base)
823                 return -ENODEV;
824
825         if (info->state != FBINFO_STATE_RUNNING)
826                 return -EPERM;
827
828         if (info->fbops->fb_write)
829                 return info->fbops->fb_write(info, buf, count, ppos);
830         
831         total_size = info->screen_size;
832
833         if (total_size == 0)
834                 total_size = info->fix.smem_len;
835
836         if (p > total_size)
837                 return -EFBIG;
838
839         if (count > total_size) {
840                 err = -EFBIG;
841                 count = total_size;
842         }
843
844         if (count + p > total_size) {
845                 if (!err)
846                         err = -ENOSPC;
847
848                 count = total_size - p;
849         }
850
851         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
852                          GFP_KERNEL);
853         if (!buffer)
854                 return -ENOMEM;
855
856         dst = (u8 __iomem *) (info->screen_base + p);
857
858         if (info->fbops->fb_sync)
859                 info->fbops->fb_sync(info);
860
861         while (count) {
862                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
863                 src = buffer;
864
865                 if (copy_from_user(src, buf, c)) {
866                         err = -EFAULT;
867                         break;
868                 }
869
870                 fb_memcpy_tofb(dst, src, c);
871                 dst += c;
872                 src += c;
873                 *ppos += c;
874                 buf += c;
875                 cnt += c;
876                 count -= c;
877         }
878
879         kfree(buffer);
880
881         return (cnt) ? cnt : err;
882 }
883
884 int
885 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
886 {
887         struct fb_fix_screeninfo *fix = &info->fix;
888         unsigned int yres = info->var.yres;
889         int err = 0;
890
891         if (var->yoffset > 0) {
892                 if (var->vmode & FB_VMODE_YWRAP) {
893                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
894                                 err = -EINVAL;
895                         else
896                                 yres = 0;
897                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
898                         err = -EINVAL;
899         }
900
901         if (var->xoffset > 0 && (!fix->xpanstep ||
902                                  (var->xoffset % fix->xpanstep)))
903                 err = -EINVAL;
904
905         if (err || !info->fbops->fb_pan_display ||
906             var->yoffset > info->var.yres_virtual - yres ||
907             var->xoffset > info->var.xres_virtual - info->var.xres)
908                 return -EINVAL;
909
910         if ((err = info->fbops->fb_pan_display(var, info)))
911                 return err;
912         info->var.xoffset = var->xoffset;
913         info->var.yoffset = var->yoffset;
914         if (var->vmode & FB_VMODE_YWRAP)
915                 info->var.vmode |= FB_VMODE_YWRAP;
916         else
917                 info->var.vmode &= ~FB_VMODE_YWRAP;
918         return 0;
919 }
920 EXPORT_SYMBOL(fb_pan_display);
921
922 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
923                          u32 activate)
924 {
925         struct fb_event event;
926         struct fb_blit_caps caps, fbcaps;
927         int err = 0;
928
929         memset(&caps, 0, sizeof(caps));
930         memset(&fbcaps, 0, sizeof(fbcaps));
931         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
932         event.info = info;
933         event.data = &caps;
934         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
935         info->fbops->fb_get_caps(info, &fbcaps, var);
936
937         if (((fbcaps.x ^ caps.x) & caps.x) ||
938             ((fbcaps.y ^ caps.y) & caps.y) ||
939             (fbcaps.len < caps.len))
940                 err = -EINVAL;
941
942         return err;
943 }
944
945 int
946 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
947 {
948         int flags = info->flags;
949         int ret = 0;
950
951         if (var->activate & FB_ACTIVATE_INV_MODE) {
952                 struct fb_videomode mode1, mode2;
953
954                 fb_var_to_videomode(&mode1, var);
955                 fb_var_to_videomode(&mode2, &info->var);
956                 /* make sure we don't delete the videomode of current var */
957                 ret = fb_mode_is_equal(&mode1, &mode2);
958
959                 if (!ret) {
960                     struct fb_event event;
961
962                     event.info = info;
963                     event.data = &mode1;
964                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
965                 }
966
967                 if (!ret)
968                     fb_delete_videomode(&mode1, &info->modelist);
969
970
971                 ret = (ret) ? -EINVAL : 0;
972                 goto done;
973         }
974
975         if ((var->activate & FB_ACTIVATE_FORCE) ||
976             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
977                 u32 activate = var->activate;
978
979                 /* When using FOURCC mode, make sure the red, green, blue and
980                  * transp fields are set to 0.
981                  */
982                 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
983                     var->grayscale > 1) {
984                         if (var->red.offset     || var->green.offset    ||
985                             var->blue.offset    || var->transp.offset   ||
986                             var->red.length     || var->green.length    ||
987                             var->blue.length    || var->transp.length   ||
988                             var->red.msb_right  || var->green.msb_right ||
989                             var->blue.msb_right || var->transp.msb_right)
990                                 return -EINVAL;
991                 }
992
993                 if (!info->fbops->fb_check_var) {
994                         *var = info->var;
995                         goto done;
996                 }
997
998                 ret = info->fbops->fb_check_var(var, info);
999
1000                 if (ret)
1001                         goto done;
1002
1003                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
1004                         struct fb_var_screeninfo old_var;
1005                         struct fb_videomode mode;
1006
1007                         if (info->fbops->fb_get_caps) {
1008                                 ret = fb_check_caps(info, var, activate);
1009
1010                                 if (ret)
1011                                         goto done;
1012                         }
1013
1014                         old_var = info->var;
1015                         info->var = *var;
1016
1017                         if (info->fbops->fb_set_par) {
1018                                 ret = info->fbops->fb_set_par(info);
1019
1020                                 if (ret) {
1021                                         info->var = old_var;
1022                                         printk(KERN_WARNING "detected "
1023                                                 "fb_set_par error, "
1024                                                 "error code: %d\n", ret);
1025                                         goto done;
1026                                 }
1027                         }
1028
1029                         fb_pan_display(info, &info->var);
1030                         fb_set_cmap(&info->cmap, info);
1031                         fb_var_to_videomode(&mode, &info->var);
1032
1033                         if (info->modelist.prev && info->modelist.next &&
1034                             !list_empty(&info->modelist))
1035                                 ret = fb_add_videomode(&mode, &info->modelist);
1036
1037                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
1038                                 struct fb_event event;
1039                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
1040                                         FB_EVENT_MODE_CHANGE_ALL :
1041                                         FB_EVENT_MODE_CHANGE;
1042
1043                                 info->flags &= ~FBINFO_MISC_USEREVENT;
1044                                 event.info = info;
1045                                 event.data = &mode;
1046                                 fb_notifier_call_chain(evnt, &event);
1047                         }
1048                 }
1049         }
1050
1051  done:
1052         return ret;
1053 }
1054 EXPORT_SYMBOL(fb_set_var);
1055
1056 int
1057 fb_blank(struct fb_info *info, int blank)
1058 {       
1059         struct fb_event event;
1060         int ret = -EINVAL, early_ret;
1061
1062         if (blank > FB_BLANK_POWERDOWN)
1063                 blank = FB_BLANK_POWERDOWN;
1064
1065         event.info = info;
1066         event.data = &blank;
1067
1068         early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
1069
1070         if (info->fbops->fb_blank)
1071                 ret = info->fbops->fb_blank(blank, info);
1072
1073         if (!ret)
1074                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1075         else {
1076                 /*
1077                  * if fb_blank is failed then revert effects of
1078                  * the early blank event.
1079                  */
1080                 if (!early_ret)
1081                         fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
1082         }
1083
1084         return ret;
1085 }
1086 EXPORT_SYMBOL(fb_blank);
1087
1088 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1089                         unsigned long arg)
1090 {
1091         struct fb_ops *fb;
1092         struct fb_var_screeninfo var;
1093         struct fb_fix_screeninfo fix;
1094         struct fb_con2fbmap con2fb;
1095         struct fb_cmap cmap_from;
1096         struct fb_cmap_user cmap;
1097         struct fb_event event;
1098         void __user *argp = (void __user *)arg;
1099         long ret = 0;
1100
1101         switch (cmd) {
1102         case FBIOGET_VSCREENINFO:
1103                 if (!lock_fb_info(info))
1104                         return -ENODEV;
1105                 var = info->var;
1106                 unlock_fb_info(info);
1107
1108                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1109                 break;
1110         case FBIOPUT_VSCREENINFO:
1111                 if (copy_from_user(&var, argp, sizeof(var)))
1112                         return -EFAULT;
1113                 console_lock();
1114                 if (!lock_fb_info(info)) {
1115                         console_unlock();
1116                         return -ENODEV;
1117                 }
1118                 info->flags |= FBINFO_MISC_USEREVENT;
1119                 ret = fb_set_var(info, &var);
1120                 info->flags &= ~FBINFO_MISC_USEREVENT;
1121                 unlock_fb_info(info);
1122                 console_unlock();
1123                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1124                         ret = -EFAULT;
1125                 break;
1126         case FBIOGET_FSCREENINFO:
1127                 if (!lock_fb_info(info))
1128                         return -ENODEV;
1129                 fix = info->fix;
1130                 unlock_fb_info(info);
1131
1132                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1133                 break;
1134         case FBIOPUTCMAP:
1135                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1136                         return -EFAULT;
1137                 ret = fb_set_user_cmap(&cmap, info);
1138                 break;
1139         case FBIOGETCMAP:
1140                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1141                         return -EFAULT;
1142                 if (!lock_fb_info(info))
1143                         return -ENODEV;
1144                 cmap_from = info->cmap;
1145                 unlock_fb_info(info);
1146                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1147                 break;
1148         case FBIOPAN_DISPLAY:
1149                 if (copy_from_user(&var, argp, sizeof(var)))
1150                         return -EFAULT;
1151                 console_lock();
1152                 if (!lock_fb_info(info)) {
1153                         console_unlock();
1154                         return -ENODEV;
1155                 }
1156                 ret = fb_pan_display(info, &var);
1157                 unlock_fb_info(info);
1158                 console_unlock();
1159                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1160                         return -EFAULT;
1161                 break;
1162         case FBIO_CURSOR:
1163                 ret = -EINVAL;
1164                 break;
1165         case FBIOGET_CON2FBMAP:
1166                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1167                         return -EFAULT;
1168                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1169                         return -EINVAL;
1170                 con2fb.framebuffer = -1;
1171                 event.data = &con2fb;
1172                 if (!lock_fb_info(info))
1173                         return -ENODEV;
1174                 event.info = info;
1175                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1176                 unlock_fb_info(info);
1177                 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1178                 break;
1179         case FBIOPUT_CON2FBMAP:
1180                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1181                         return -EFAULT;
1182                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1183                         return -EINVAL;
1184                 if (con2fb.framebuffer >= FB_MAX)
1185                         return -EINVAL;
1186                 if (!registered_fb[con2fb.framebuffer])
1187                         request_module("fb%d", con2fb.framebuffer);
1188                 if (!registered_fb[con2fb.framebuffer]) {
1189                         ret = -EINVAL;
1190                         break;
1191                 }
1192                 event.data = &con2fb;
1193                 console_lock();
1194                 if (!lock_fb_info(info)) {
1195                         console_unlock();
1196                         return -ENODEV;
1197                 }
1198                 event.info = info;
1199                 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1200                 unlock_fb_info(info);
1201                 console_unlock();
1202                 break;
1203         case FBIOBLANK:
1204                 console_lock();
1205                 if (!lock_fb_info(info)) {
1206                         console_unlock();
1207                         return -ENODEV;
1208                 }
1209                 info->flags |= FBINFO_MISC_USEREVENT;
1210                 ret = fb_blank(info, arg);
1211                 info->flags &= ~FBINFO_MISC_USEREVENT;
1212                 unlock_fb_info(info);
1213                 console_unlock();
1214                 break;
1215         default:
1216                 if (!lock_fb_info(info))
1217                         return -ENODEV;
1218                 fb = info->fbops;
1219                 if (fb->fb_ioctl)
1220                         ret = fb->fb_ioctl(info, cmd, arg);
1221                 else
1222                         ret = -ENOTTY;
1223                 unlock_fb_info(info);
1224         }
1225         return ret;
1226 }
1227
1228 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1229 {
1230         struct fb_info *info = file_fb_info(file);
1231
1232         if (!info)
1233                 return -ENODEV;
1234         return do_fb_ioctl(info, cmd, arg);
1235 }
1236
1237 #ifdef CONFIG_COMPAT
1238 struct fb_fix_screeninfo32 {
1239         char                    id[16];
1240         compat_caddr_t          smem_start;
1241         u32                     smem_len;
1242         u32                     type;
1243         u32                     type_aux;
1244         u32                     visual;
1245         u16                     xpanstep;
1246         u16                     ypanstep;
1247         u16                     ywrapstep;
1248         u32                     line_length;
1249         compat_caddr_t          mmio_start;
1250         u32                     mmio_len;
1251         u32                     accel;
1252         u16                     reserved[3];
1253 };
1254
1255 struct fb_cmap32 {
1256         u32                     start;
1257         u32                     len;
1258         compat_caddr_t  red;
1259         compat_caddr_t  green;
1260         compat_caddr_t  blue;
1261         compat_caddr_t  transp;
1262 };
1263
1264 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1265                           unsigned long arg)
1266 {
1267         struct fb_cmap_user __user *cmap;
1268         struct fb_cmap32 __user *cmap32;
1269         __u32 data;
1270         int err;
1271
1272         cmap = compat_alloc_user_space(sizeof(*cmap));
1273         cmap32 = compat_ptr(arg);
1274
1275         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1276                 return -EFAULT;
1277
1278         if (get_user(data, &cmap32->red) ||
1279             put_user(compat_ptr(data), &cmap->red) ||
1280             get_user(data, &cmap32->green) ||
1281             put_user(compat_ptr(data), &cmap->green) ||
1282             get_user(data, &cmap32->blue) ||
1283             put_user(compat_ptr(data), &cmap->blue) ||
1284             get_user(data, &cmap32->transp) ||
1285             put_user(compat_ptr(data), &cmap->transp))
1286                 return -EFAULT;
1287
1288         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1289
1290         if (!err) {
1291                 if (copy_in_user(&cmap32->start,
1292                                  &cmap->start,
1293                                  2 * sizeof(__u32)))
1294                         err = -EFAULT;
1295         }
1296         return err;
1297 }
1298
1299 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1300                                   struct fb_fix_screeninfo32 __user *fix32)
1301 {
1302         __u32 data;
1303         int err;
1304
1305         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1306
1307         data = (__u32) (unsigned long) fix->smem_start;
1308         err |= put_user(data, &fix32->smem_start);
1309
1310         err |= put_user(fix->smem_len, &fix32->smem_len);
1311         err |= put_user(fix->type, &fix32->type);
1312         err |= put_user(fix->type_aux, &fix32->type_aux);
1313         err |= put_user(fix->visual, &fix32->visual);
1314         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1315         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1316         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1317         err |= put_user(fix->line_length, &fix32->line_length);
1318
1319         data = (__u32) (unsigned long) fix->mmio_start;
1320         err |= put_user(data, &fix32->mmio_start);
1321
1322         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1323         err |= put_user(fix->accel, &fix32->accel);
1324         err |= copy_to_user(fix32->reserved, fix->reserved,
1325                             sizeof(fix->reserved));
1326
1327         if (err)
1328                 return -EFAULT;
1329         return 0;
1330 }
1331
1332 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1333                               unsigned long arg)
1334 {
1335         struct fb_fix_screeninfo fix;
1336
1337         if (!lock_fb_info(info))
1338                 return -ENODEV;
1339         fix = info->fix;
1340         unlock_fb_info(info);
1341         return do_fscreeninfo_to_user(&fix, compat_ptr(arg));
1342 }
1343
1344 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1345                             unsigned long arg)
1346 {
1347         struct fb_info *info = file_fb_info(file);
1348         struct fb_ops *fb;
1349         long ret = -ENOIOCTLCMD;
1350
1351         if (!info)
1352                 return -ENODEV;
1353         fb = info->fbops;
1354         switch(cmd) {
1355         case FBIOGET_VSCREENINFO:
1356         case FBIOPUT_VSCREENINFO:
1357         case FBIOPAN_DISPLAY:
1358         case FBIOGET_CON2FBMAP:
1359         case FBIOPUT_CON2FBMAP:
1360                 arg = (unsigned long) compat_ptr(arg);
1361         case FBIOBLANK:
1362                 ret = do_fb_ioctl(info, cmd, arg);
1363                 break;
1364
1365         case FBIOGET_FSCREENINFO:
1366                 ret = fb_get_fscreeninfo(info, cmd, arg);
1367                 break;
1368
1369         case FBIOGETCMAP:
1370         case FBIOPUTCMAP:
1371                 ret = fb_getput_cmap(info, cmd, arg);
1372                 break;
1373
1374         default:
1375                 if (fb->fb_compat_ioctl)
1376                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1377                 break;
1378         }
1379         return ret;
1380 }
1381 #endif
1382
1383 static int
1384 fb_mmap(struct file *file, struct vm_area_struct * vma)
1385 {
1386         struct fb_info *info = file_fb_info(file);
1387         struct fb_ops *fb;
1388         unsigned long mmio_pgoff;
1389         unsigned long start;
1390         u32 len;
1391
1392         if (!info)
1393                 return -ENODEV;
1394         fb = info->fbops;
1395         if (!fb)
1396                 return -ENODEV;
1397         mutex_lock(&info->mm_lock);
1398         if (fb->fb_mmap) {
1399                 int res;
1400
1401                 /*
1402                  * The framebuffer needs to be accessed decrypted, be sure
1403                  * SME protection is removed ahead of the call
1404                  */
1405                 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1406                 res = fb->fb_mmap(info, vma);
1407                 mutex_unlock(&info->mm_lock);
1408                 return res;
1409         }
1410
1411         /*
1412          * Ugh. This can be either the frame buffer mapping, or
1413          * if pgoff points past it, the mmio mapping.
1414          */
1415         start = info->fix.smem_start;
1416         len = info->fix.smem_len;
1417         mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1418         if (vma->vm_pgoff >= mmio_pgoff) {
1419                 if (info->var.accel_flags) {
1420                         mutex_unlock(&info->mm_lock);
1421                         return -EINVAL;
1422                 }
1423
1424                 vma->vm_pgoff -= mmio_pgoff;
1425                 start = info->fix.mmio_start;
1426                 len = info->fix.mmio_len;
1427         }
1428         mutex_unlock(&info->mm_lock);
1429
1430         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1431         /*
1432          * The framebuffer needs to be accessed decrypted, be sure
1433          * SME protection is removed
1434          */
1435         vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1436         fb_pgprotect(file, vma, start);
1437
1438         return vm_iomap_memory(vma, start, len);
1439 }
1440
1441 static int
1442 fb_open(struct inode *inode, struct file *file)
1443 __acquires(&info->lock)
1444 __releases(&info->lock)
1445 {
1446         int fbidx = iminor(inode);
1447         struct fb_info *info;
1448         int res = 0;
1449
1450         info = get_fb_info(fbidx);
1451         if (!info) {
1452                 request_module("fb%d", fbidx);
1453                 info = get_fb_info(fbidx);
1454                 if (!info)
1455                         return -ENODEV;
1456         }
1457         if (IS_ERR(info))
1458                 return PTR_ERR(info);
1459
1460         mutex_lock(&info->lock);
1461         if (!try_module_get(info->fbops->owner)) {
1462                 res = -ENODEV;
1463                 goto out;
1464         }
1465         file->private_data = info;
1466         if (info->fbops->fb_open) {
1467                 res = info->fbops->fb_open(info,1);
1468                 if (res)
1469                         module_put(info->fbops->owner);
1470         }
1471 #ifdef CONFIG_FB_DEFERRED_IO
1472         if (info->fbdefio)
1473                 fb_deferred_io_open(info, inode, file);
1474 #endif
1475 out:
1476         mutex_unlock(&info->lock);
1477         if (res)
1478                 put_fb_info(info);
1479         return res;
1480 }
1481
1482 static int 
1483 fb_release(struct inode *inode, struct file *file)
1484 __acquires(&info->lock)
1485 __releases(&info->lock)
1486 {
1487         struct fb_info * const info = file->private_data;
1488
1489         mutex_lock(&info->lock);
1490         if (info->fbops->fb_release)
1491                 info->fbops->fb_release(info,1);
1492         module_put(info->fbops->owner);
1493         mutex_unlock(&info->lock);
1494         put_fb_info(info);
1495         return 0;
1496 }
1497
1498 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU)
1499 unsigned long get_fb_unmapped_area(struct file *filp,
1500                                    unsigned long addr, unsigned long len,
1501                                    unsigned long pgoff, unsigned long flags)
1502 {
1503         struct fb_info * const info = filp->private_data;
1504         unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
1505
1506         if (pgoff > fb_size || len > fb_size - pgoff)
1507                 return -EINVAL;
1508
1509         return (unsigned long)info->screen_base + pgoff;
1510 }
1511 #endif
1512
1513 static const struct file_operations fb_fops = {
1514         .owner =        THIS_MODULE,
1515         .read =         fb_read,
1516         .write =        fb_write,
1517         .unlocked_ioctl = fb_ioctl,
1518 #ifdef CONFIG_COMPAT
1519         .compat_ioctl = fb_compat_ioctl,
1520 #endif
1521         .mmap =         fb_mmap,
1522         .open =         fb_open,
1523         .release =      fb_release,
1524 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \
1525         (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \
1526          !defined(CONFIG_MMU))
1527         .get_unmapped_area = get_fb_unmapped_area,
1528 #endif
1529 #ifdef CONFIG_FB_DEFERRED_IO
1530         .fsync =        fb_deferred_io_fsync,
1531 #endif
1532         .llseek =       default_llseek,
1533 };
1534
1535 struct class *fb_class;
1536 EXPORT_SYMBOL(fb_class);
1537
1538 static int fb_check_foreignness(struct fb_info *fi)
1539 {
1540         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1541
1542         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1543
1544 #ifdef __BIG_ENDIAN
1545         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1546 #else
1547         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1548 #endif /* __BIG_ENDIAN */
1549
1550         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1551                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1552                        "support this framebuffer\n", fi->fix.id);
1553                 return -ENOSYS;
1554         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1555                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1556                        "support this framebuffer\n", fi->fix.id);
1557                 return -ENOSYS;
1558         }
1559
1560         return 0;
1561 }
1562
1563 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1564 {
1565         /* is the generic aperture base the same as the HW one */
1566         if (gen->base == hw->base)
1567                 return true;
1568         /* is the generic aperture base inside the hw base->hw base+size */
1569         if (gen->base > hw->base && gen->base < hw->base + hw->size)
1570                 return true;
1571         return false;
1572 }
1573
1574 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1575                                     struct apertures_struct *hwa)
1576 {
1577         int i, j;
1578         if (!hwa || !gena)
1579                 return false;
1580
1581         for (i = 0; i < hwa->count; ++i) {
1582                 struct aperture *h = &hwa->ranges[i];
1583                 for (j = 0; j < gena->count; ++j) {
1584                         struct aperture *g = &gena->ranges[j];
1585                         printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1586                                 (unsigned long long)g->base,
1587                                 (unsigned long long)g->size,
1588                                 (unsigned long long)h->base,
1589                                 (unsigned long long)h->size);
1590                         if (apertures_overlap(g, h))
1591                                 return true;
1592                 }
1593         }
1594
1595         return false;
1596 }
1597
1598 static int do_unregister_framebuffer(struct fb_info *fb_info);
1599
1600 #define VGA_FB_PHYS 0xA0000
1601 static int do_remove_conflicting_framebuffers(struct apertures_struct *a,
1602                                               const char *name, bool primary)
1603 {
1604         int i, ret;
1605
1606         /* check all firmware fbs and kick off if the base addr overlaps */
1607         for (i = 0 ; i < FB_MAX; i++) {
1608                 struct apertures_struct *gen_aper;
1609                 if (!registered_fb[i])
1610                         continue;
1611
1612                 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1613                         continue;
1614
1615                 gen_aper = registered_fb[i]->apertures;
1616                 if (fb_do_apertures_overlap(gen_aper, a) ||
1617                         (primary && gen_aper && gen_aper->count &&
1618                          gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1619
1620                         printk(KERN_INFO "fb: switching to %s from %s\n",
1621                                name, registered_fb[i]->fix.id);
1622                         ret = do_unregister_framebuffer(registered_fb[i]);
1623                         if (ret)
1624                                 return ret;
1625                 }
1626         }
1627
1628         return 0;
1629 }
1630
1631 static bool lockless_register_fb;
1632 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
1633 MODULE_PARM_DESC(lockless_register_fb,
1634         "Lockless framebuffer registration for debugging [default=off]");
1635
1636 static int do_register_framebuffer(struct fb_info *fb_info)
1637 {
1638         int i, ret;
1639         struct fb_event event;
1640         struct fb_videomode mode;
1641
1642         if (fb_check_foreignness(fb_info))
1643                 return -ENOSYS;
1644
1645         ret = do_remove_conflicting_framebuffers(fb_info->apertures,
1646                                                  fb_info->fix.id,
1647                                                  fb_is_primary_device(fb_info));
1648         if (ret)
1649                 return ret;
1650
1651         if (num_registered_fb == FB_MAX)
1652                 return -ENXIO;
1653
1654         num_registered_fb++;
1655         for (i = 0 ; i < FB_MAX; i++)
1656                 if (!registered_fb[i])
1657                         break;
1658         fb_info->node = i;
1659         atomic_set(&fb_info->count, 1);
1660         mutex_init(&fb_info->lock);
1661         mutex_init(&fb_info->mm_lock);
1662
1663         fb_info->dev = device_create(fb_class, fb_info->device,
1664                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1665         if (IS_ERR(fb_info->dev)) {
1666                 /* Not fatal */
1667                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1668                 fb_info->dev = NULL;
1669         } else
1670                 fb_init_device(fb_info);
1671
1672         if (fb_info->pixmap.addr == NULL) {
1673                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1674                 if (fb_info->pixmap.addr) {
1675                         fb_info->pixmap.size = FBPIXMAPSIZE;
1676                         fb_info->pixmap.buf_align = 1;
1677                         fb_info->pixmap.scan_align = 1;
1678                         fb_info->pixmap.access_align = 32;
1679                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1680                 }
1681         }       
1682         fb_info->pixmap.offset = 0;
1683
1684         if (!fb_info->pixmap.blit_x)
1685                 fb_info->pixmap.blit_x = ~(u32)0;
1686
1687         if (!fb_info->pixmap.blit_y)
1688                 fb_info->pixmap.blit_y = ~(u32)0;
1689
1690         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1691                 INIT_LIST_HEAD(&fb_info->modelist);
1692
1693         if (fb_info->skip_vt_switch)
1694                 pm_vt_switch_required(fb_info->dev, false);
1695         else
1696                 pm_vt_switch_required(fb_info->dev, true);
1697
1698         fb_var_to_videomode(&mode, &fb_info->var);
1699         fb_add_videomode(&mode, &fb_info->modelist);
1700         registered_fb[i] = fb_info;
1701
1702         event.info = fb_info;
1703         if (!lockless_register_fb)
1704                 console_lock();
1705         if (!lock_fb_info(fb_info)) {
1706                 if (!lockless_register_fb)
1707                         console_unlock();
1708                 return -ENODEV;
1709         }
1710
1711         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1712         unlock_fb_info(fb_info);
1713         if (!lockless_register_fb)
1714                 console_unlock();
1715         return 0;
1716 }
1717
1718 static int do_unregister_framebuffer(struct fb_info *fb_info)
1719 {
1720         struct fb_event event;
1721         int i, ret = 0;
1722
1723         i = fb_info->node;
1724         if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1725                 return -EINVAL;
1726
1727         console_lock();
1728         if (!lock_fb_info(fb_info)) {
1729                 console_unlock();
1730                 return -ENODEV;
1731         }
1732
1733         event.info = fb_info;
1734         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1735         unlock_fb_info(fb_info);
1736         console_unlock();
1737
1738         if (ret)
1739                 return -EINVAL;
1740
1741         pm_vt_switch_unregister(fb_info->dev);
1742
1743         unlink_framebuffer(fb_info);
1744         if (fb_info->pixmap.addr &&
1745             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1746                 kfree(fb_info->pixmap.addr);
1747         fb_destroy_modelist(&fb_info->modelist);
1748         registered_fb[i] = NULL;
1749         num_registered_fb--;
1750         fb_cleanup_device(fb_info);
1751         event.info = fb_info;
1752         console_lock();
1753         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1754         console_unlock();
1755
1756         /* this may free fb info */
1757         put_fb_info(fb_info);
1758         return 0;
1759 }
1760
1761 int unlink_framebuffer(struct fb_info *fb_info)
1762 {
1763         int i;
1764
1765         i = fb_info->node;
1766         if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1767                 return -EINVAL;
1768
1769         if (fb_info->dev) {
1770                 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1771                 fb_info->dev = NULL;
1772         }
1773         return 0;
1774 }
1775 EXPORT_SYMBOL(unlink_framebuffer);
1776
1777 int remove_conflicting_framebuffers(struct apertures_struct *a,
1778                                     const char *name, bool primary)
1779 {
1780         int ret;
1781
1782         mutex_lock(&registration_lock);
1783         ret = do_remove_conflicting_framebuffers(a, name, primary);
1784         mutex_unlock(&registration_lock);
1785
1786         return ret;
1787 }
1788 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1789
1790 /**
1791  *      register_framebuffer - registers a frame buffer device
1792  *      @fb_info: frame buffer info structure
1793  *
1794  *      Registers a frame buffer device @fb_info.
1795  *
1796  *      Returns negative errno on error, or zero for success.
1797  *
1798  */
1799 int
1800 register_framebuffer(struct fb_info *fb_info)
1801 {
1802         int ret;
1803
1804         mutex_lock(&registration_lock);
1805         ret = do_register_framebuffer(fb_info);
1806         mutex_unlock(&registration_lock);
1807
1808         return ret;
1809 }
1810 EXPORT_SYMBOL(register_framebuffer);
1811
1812 /**
1813  *      unregister_framebuffer - releases a frame buffer device
1814  *      @fb_info: frame buffer info structure
1815  *
1816  *      Unregisters a frame buffer device @fb_info.
1817  *
1818  *      Returns negative errno on error, or zero for success.
1819  *
1820  *      This function will also notify the framebuffer console
1821  *      to release the driver.
1822  *
1823  *      This is meant to be called within a driver's module_exit()
1824  *      function. If this is called outside module_exit(), ensure
1825  *      that the driver implements fb_open() and fb_release() to
1826  *      check that no processes are using the device.
1827  */
1828 int
1829 unregister_framebuffer(struct fb_info *fb_info)
1830 {
1831         int ret;
1832
1833         mutex_lock(&registration_lock);
1834         ret = do_unregister_framebuffer(fb_info);
1835         mutex_unlock(&registration_lock);
1836
1837         return ret;
1838 }
1839 EXPORT_SYMBOL(unregister_framebuffer);
1840
1841 /**
1842  *      fb_set_suspend - low level driver signals suspend
1843  *      @info: framebuffer affected
1844  *      @state: 0 = resuming, !=0 = suspending
1845  *
1846  *      This is meant to be used by low level drivers to
1847  *      signal suspend/resume to the core & clients.
1848  *      It must be called with the console semaphore held
1849  */
1850 void fb_set_suspend(struct fb_info *info, int state)
1851 {
1852         struct fb_event event;
1853
1854         event.info = info;
1855         if (state) {
1856                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1857                 info->state = FBINFO_STATE_SUSPENDED;
1858         } else {
1859                 info->state = FBINFO_STATE_RUNNING;
1860                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1861         }
1862 }
1863 EXPORT_SYMBOL(fb_set_suspend);
1864
1865 /**
1866  *      fbmem_init - init frame buffer subsystem
1867  *
1868  *      Initialize the frame buffer subsystem.
1869  *
1870  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1871  *
1872  */
1873
1874 static int __init
1875 fbmem_init(void)
1876 {
1877         int ret;
1878
1879         if (!proc_create("fb", 0, NULL, &fb_proc_fops))
1880                 return -ENOMEM;
1881
1882         ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
1883         if (ret) {
1884                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1885                 goto err_chrdev;
1886         }
1887
1888         fb_class = class_create(THIS_MODULE, "graphics");
1889         if (IS_ERR(fb_class)) {
1890                 ret = PTR_ERR(fb_class);
1891                 pr_warn("Unable to create fb class; errno = %d\n", ret);
1892                 fb_class = NULL;
1893                 goto err_class;
1894         }
1895         return 0;
1896
1897 err_class:
1898         unregister_chrdev(FB_MAJOR, "fb");
1899 err_chrdev:
1900         remove_proc_entry("fb", NULL);
1901         return ret;
1902 }
1903
1904 #ifdef MODULE
1905 module_init(fbmem_init);
1906 static void __exit
1907 fbmem_exit(void)
1908 {
1909         remove_proc_entry("fb", NULL);
1910         class_destroy(fb_class);
1911         unregister_chrdev(FB_MAJOR, "fb");
1912 }
1913
1914 module_exit(fbmem_exit);
1915 MODULE_LICENSE("GPL");
1916 MODULE_DESCRIPTION("Framebuffer base");
1917 #else
1918 subsys_initcall(fbmem_init);
1919 #endif
1920
1921 int fb_new_modelist(struct fb_info *info)
1922 {
1923         struct fb_event event;
1924         struct fb_var_screeninfo var = info->var;
1925         struct list_head *pos, *n;
1926         struct fb_modelist *modelist;
1927         struct fb_videomode *m, mode;
1928         int err = 1;
1929
1930         list_for_each_safe(pos, n, &info->modelist) {
1931                 modelist = list_entry(pos, struct fb_modelist, list);
1932                 m = &modelist->mode;
1933                 fb_videomode_to_var(&var, m);
1934                 var.activate = FB_ACTIVATE_TEST;
1935                 err = fb_set_var(info, &var);
1936                 fb_var_to_videomode(&mode, &var);
1937                 if (err || !fb_mode_is_equal(m, &mode)) {
1938                         list_del(pos);
1939                         kfree(pos);
1940                 }
1941         }
1942
1943         err = 1;
1944
1945         if (!list_empty(&info->modelist)) {
1946                 event.info = info;
1947                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1948         }
1949
1950         return err;
1951 }
1952
1953 MODULE_LICENSE("GPL");