Merge tag 'fbdev-v4.14' of git://github.com/bzolnier/linux
[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/fbcon.h>
36 #include <linux/mem_encrypt.h>
37
38 #include <asm/fb.h>
39
40
41     /*
42      *  Frame buffer device initialization and setup routines
43      */
44
45 #define FBPIXMAPSIZE    (1024 * 8)
46
47 static DEFINE_MUTEX(registration_lock);
48
49 struct fb_info *registered_fb[FB_MAX] __read_mostly;
50 EXPORT_SYMBOL(registered_fb);
51
52 int num_registered_fb __read_mostly;
53 EXPORT_SYMBOL(num_registered_fb);
54
55 static struct fb_info *get_fb_info(unsigned int idx)
56 {
57         struct fb_info *fb_info;
58
59         if (idx >= FB_MAX)
60                 return ERR_PTR(-ENODEV);
61
62         mutex_lock(&registration_lock);
63         fb_info = registered_fb[idx];
64         if (fb_info)
65                 atomic_inc(&fb_info->count);
66         mutex_unlock(&registration_lock);
67
68         return fb_info;
69 }
70
71 static void put_fb_info(struct fb_info *fb_info)
72 {
73         if (!atomic_dec_and_test(&fb_info->count))
74                 return;
75         if (fb_info->fbops->fb_destroy)
76                 fb_info->fbops->fb_destroy(fb_info);
77 }
78
79 int lock_fb_info(struct fb_info *info)
80 {
81         mutex_lock(&info->lock);
82         if (!info->fbops) {
83                 mutex_unlock(&info->lock);
84                 return 0;
85         }
86         return 1;
87 }
88 EXPORT_SYMBOL(lock_fb_info);
89
90 /*
91  * Helpers
92  */
93
94 int fb_get_color_depth(struct fb_var_screeninfo *var,
95                        struct fb_fix_screeninfo *fix)
96 {
97         int depth = 0;
98
99         if (fix->visual == FB_VISUAL_MONO01 ||
100             fix->visual == FB_VISUAL_MONO10)
101                 depth = 1;
102         else {
103                 if (var->green.length == var->blue.length &&
104                     var->green.length == var->red.length &&
105                     var->green.offset == var->blue.offset &&
106                     var->green.offset == var->red.offset)
107                         depth = var->green.length;
108                 else
109                         depth = var->green.length + var->red.length +
110                                 var->blue.length;
111         }
112
113         return depth;
114 }
115 EXPORT_SYMBOL(fb_get_color_depth);
116
117 /*
118  * Data padding functions.
119  */
120 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
121 {
122         __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
123 }
124 EXPORT_SYMBOL(fb_pad_aligned_buffer);
125
126 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
127                                 u32 shift_high, u32 shift_low, u32 mod)
128 {
129         u8 mask = (u8) (0xfff << shift_high), tmp;
130         int i, j;
131
132         for (i = height; i--; ) {
133                 for (j = 0; j < idx; j++) {
134                         tmp = dst[j];
135                         tmp &= mask;
136                         tmp |= *src >> shift_low;
137                         dst[j] = tmp;
138                         tmp = *src << shift_high;
139                         dst[j+1] = tmp;
140                         src++;
141                 }
142                 tmp = dst[idx];
143                 tmp &= mask;
144                 tmp |= *src >> shift_low;
145                 dst[idx] = tmp;
146                 if (shift_high < mod) {
147                         tmp = *src << shift_high;
148                         dst[idx+1] = tmp;
149                 }
150                 src++;
151                 dst += d_pitch;
152         }
153 }
154 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
155
156 /*
157  * we need to lock this section since fb_cursor
158  * may use fb_imageblit()
159  */
160 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
161 {
162         u32 align = buf->buf_align - 1, offset;
163         char *addr = buf->addr;
164
165         /* If IO mapped, we need to sync before access, no sharing of
166          * the pixmap is done
167          */
168         if (buf->flags & FB_PIXMAP_IO) {
169                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
170                         info->fbops->fb_sync(info);
171                 return addr;
172         }
173
174         /* See if we fit in the remaining pixmap space */
175         offset = buf->offset + align;
176         offset &= ~align;
177         if (offset + size > buf->size) {
178                 /* We do not fit. In order to be able to re-use the buffer,
179                  * we must ensure no asynchronous DMA'ing or whatever operation
180                  * is in progress, we sync for that.
181                  */
182                 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
183                         info->fbops->fb_sync(info);
184                 offset = 0;
185         }
186         buf->offset = offset + size;
187         addr += offset;
188
189         return addr;
190 }
191 EXPORT_SYMBOL(fb_get_buffer_offset);
192
193 #ifdef CONFIG_LOGO
194
195 static inline unsigned safe_shift(unsigned d, int n)
196 {
197         return n < 0 ? d >> -n : d << n;
198 }
199
200 static void fb_set_logocmap(struct fb_info *info,
201                                    const struct linux_logo *logo)
202 {
203         struct fb_cmap palette_cmap;
204         u16 palette_green[16];
205         u16 palette_blue[16];
206         u16 palette_red[16];
207         int i, j, n;
208         const unsigned char *clut = logo->clut;
209
210         palette_cmap.start = 0;
211         palette_cmap.len = 16;
212         palette_cmap.red = palette_red;
213         palette_cmap.green = palette_green;
214         palette_cmap.blue = palette_blue;
215         palette_cmap.transp = NULL;
216
217         for (i = 0; i < logo->clutsize; i += n) {
218                 n = logo->clutsize - i;
219                 /* palette_cmap provides space for only 16 colors at once */
220                 if (n > 16)
221                         n = 16;
222                 palette_cmap.start = 32 + i;
223                 palette_cmap.len = n;
224                 for (j = 0; j < n; ++j) {
225                         palette_cmap.red[j] = clut[0] << 8 | clut[0];
226                         palette_cmap.green[j] = clut[1] << 8 | clut[1];
227                         palette_cmap.blue[j] = clut[2] << 8 | clut[2];
228                         clut += 3;
229                 }
230                 fb_set_cmap(&palette_cmap, info);
231         }
232 }
233
234 static void  fb_set_logo_truepalette(struct fb_info *info,
235                                             const struct linux_logo *logo,
236                                             u32 *palette)
237 {
238         static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
239         unsigned char redmask, greenmask, bluemask;
240         int redshift, greenshift, blueshift;
241         int i;
242         const unsigned char *clut = logo->clut;
243
244         /*
245          * We have to create a temporary palette since console palette is only
246          * 16 colors long.
247          */
248         /* Bug: Doesn't obey msb_right ... (who needs that?) */
249         redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
250         greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
251         bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
252         redshift   = info->var.red.offset   - (8 - info->var.red.length);
253         greenshift = info->var.green.offset - (8 - info->var.green.length);
254         blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);
255
256         for ( i = 0; i < logo->clutsize; i++) {
257                 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
258                                  safe_shift((clut[1] & greenmask), greenshift) |
259                                  safe_shift((clut[2] & bluemask), blueshift));
260                 clut += 3;
261         }
262 }
263
264 static void fb_set_logo_directpalette(struct fb_info *info,
265                                              const struct linux_logo *logo,
266                                              u32 *palette)
267 {
268         int redshift, greenshift, blueshift;
269         int i;
270
271         redshift = info->var.red.offset;
272         greenshift = info->var.green.offset;
273         blueshift = info->var.blue.offset;
274
275         for (i = 32; i < 32 + logo->clutsize; i++)
276                 palette[i] = i << redshift | i << greenshift | i << blueshift;
277 }
278
279 static void fb_set_logo(struct fb_info *info,
280                                const struct linux_logo *logo, u8 *dst,
281                                int depth)
282 {
283         int i, j, k;
284         const u8 *src = logo->data;
285         u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
286         u8 fg = 1, d;
287
288         switch (fb_get_color_depth(&info->var, &info->fix)) {
289         case 1:
290                 fg = 1;
291                 break;
292         case 2:
293                 fg = 3;
294                 break;
295         default:
296                 fg = 7;
297                 break;
298         }
299
300         if (info->fix.visual == FB_VISUAL_MONO01 ||
301             info->fix.visual == FB_VISUAL_MONO10)
302                 fg = ~((u8) (0xfff << info->var.green.length));
303
304         switch (depth) {
305         case 4:
306                 for (i = 0; i < logo->height; i++)
307                         for (j = 0; j < logo->width; src++) {
308                                 *dst++ = *src >> 4;
309                                 j++;
310                                 if (j < logo->width) {
311                                         *dst++ = *src & 0x0f;
312                                         j++;
313                                 }
314                         }
315                 break;
316         case 1:
317                 for (i = 0; i < logo->height; i++) {
318                         for (j = 0; j < logo->width; src++) {
319                                 d = *src ^ xor;
320                                 for (k = 7; k >= 0 && j < logo->width; k--) {
321                                         *dst++ = ((d >> k) & 1) ? fg : 0;
322                                         j++;
323                                 }
324                         }
325                 }
326                 break;
327         }
328 }
329
330 /*
331  * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
332  * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
333  * the visual format and color depth of the framebuffer, the DAC, the
334  * pseudo_palette, and the logo data will be adjusted accordingly.
335  *
336  * Case 1 - linux_logo_clut224:
337  * Color exceeds the number of console colors (16), thus we set the hardware DAC
338  * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
339  *
340  * For visuals that require color info from the pseudo_palette, we also construct
341  * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
342  * will be set.
343  *
344  * Case 2 - linux_logo_vga16:
345  * The number of colors just matches the console colors, thus there is no need
346  * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
347  * each byte contains color information for two pixels (upper and lower nibble).
348  * To be consistent with fb_imageblit() usage, we therefore separate the two
349  * nibbles into separate bytes. The "depth" flag will be set to 4.
350  *
351  * Case 3 - linux_logo_mono:
352  * This is similar with Case 2.  Each byte contains information for 8 pixels.
353  * We isolate each bit and expand each into a byte. The "depth" flag will
354  * be set to 1.
355  */
356 static struct logo_data {
357         int depth;
358         int needs_directpalette;
359         int needs_truepalette;
360         int needs_cmapreset;
361         const struct linux_logo *logo;
362 } fb_logo __read_mostly;
363
364 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
365 {
366         u32 size = width * height, i;
367
368         out += size - 1;
369
370         for (i = size; i--; )
371                 *out-- = *in++;
372 }
373
374 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
375 {
376         int i, j, h = height - 1;
377
378         for (i = 0; i < height; i++)
379                 for (j = 0; j < width; j++)
380                                 out[height * j + h - i] = *in++;
381 }
382
383 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
384 {
385         int i, j, w = width - 1;
386
387         for (i = 0; i < height; i++)
388                 for (j = 0; j < width; j++)
389                         out[height * (w - j) + i] = *in++;
390 }
391
392 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
393                            struct fb_image *image, int rotate)
394 {
395         u32 tmp;
396
397         if (rotate == FB_ROTATE_UD) {
398                 fb_rotate_logo_ud(image->data, dst, image->width,
399                                   image->height);
400                 image->dx = info->var.xres - image->width - image->dx;
401                 image->dy = info->var.yres - image->height - image->dy;
402         } else if (rotate == FB_ROTATE_CW) {
403                 fb_rotate_logo_cw(image->data, dst, image->width,
404                                   image->height);
405                 tmp = image->width;
406                 image->width = image->height;
407                 image->height = tmp;
408                 tmp = image->dy;
409                 image->dy = image->dx;
410                 image->dx = info->var.xres - image->width - tmp;
411         } else if (rotate == FB_ROTATE_CCW) {
412                 fb_rotate_logo_ccw(image->data, dst, image->width,
413                                    image->height);
414                 tmp = image->width;
415                 image->width = image->height;
416                 image->height = tmp;
417                 tmp = image->dx;
418                 image->dx = image->dy;
419                 image->dy = info->var.yres - image->height - tmp;
420         }
421
422         image->data = dst;
423 }
424
425 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
426                             int rotate, unsigned int num)
427 {
428         unsigned int x;
429
430         if (rotate == FB_ROTATE_UR) {
431                 for (x = 0;
432                      x < num && image->dx + image->width <= info->var.xres;
433                      x++) {
434                         info->fbops->fb_imageblit(info, image);
435                         image->dx += image->width + 8;
436                 }
437         } else if (rotate == FB_ROTATE_UD) {
438                 for (x = 0; x < num; x++) {
439                         info->fbops->fb_imageblit(info, image);
440                         image->dx -= image->width + 8;
441                 }
442         } else if (rotate == FB_ROTATE_CW) {
443                 for (x = 0;
444                      x < num && image->dy + image->height <= info->var.yres;
445                      x++) {
446                         info->fbops->fb_imageblit(info, image);
447                         image->dy += image->height + 8;
448                 }
449         } else if (rotate == FB_ROTATE_CCW) {
450                 for (x = 0; x < num; x++) {
451                         info->fbops->fb_imageblit(info, image);
452                         image->dy -= image->height + 8;
453                 }
454         }
455 }
456
457 static int fb_show_logo_line(struct fb_info *info, int rotate,
458                              const struct linux_logo *logo, int y,
459                              unsigned int n)
460 {
461         u32 *palette = NULL, *saved_pseudo_palette = NULL;
462         unsigned char *logo_new = NULL, *logo_rotate = NULL;
463         struct fb_image image;
464
465         /* Return if the frame buffer is not mapped or suspended */
466         if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
467             info->fbops->owner)
468                 return 0;
469
470         image.depth = 8;
471         image.data = logo->data;
472
473         if (fb_logo.needs_cmapreset)
474                 fb_set_logocmap(info, logo);
475
476         if (fb_logo.needs_truepalette ||
477             fb_logo.needs_directpalette) {
478                 palette = kmalloc(256 * 4, GFP_KERNEL);
479                 if (palette == NULL)
480                         return 0;
481
482                 if (fb_logo.needs_truepalette)
483                         fb_set_logo_truepalette(info, logo, palette);
484                 else
485                         fb_set_logo_directpalette(info, logo, palette);
486
487                 saved_pseudo_palette = info->pseudo_palette;
488                 info->pseudo_palette = palette;
489         }
490
491         if (fb_logo.depth <= 4) {
492                 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
493                 if (logo_new == NULL) {
494                         kfree(palette);
495                         if (saved_pseudo_palette)
496                                 info->pseudo_palette = saved_pseudo_palette;
497                         return 0;
498                 }
499                 image.data = logo_new;
500                 fb_set_logo(info, logo, logo_new, fb_logo.depth);
501         }
502
503         image.dx = 0;
504         image.dy = y;
505         image.width = logo->width;
506         image.height = logo->height;
507
508         if (rotate) {
509                 logo_rotate = kmalloc(logo->width *
510                                       logo->height, GFP_KERNEL);
511                 if (logo_rotate)
512                         fb_rotate_logo(info, logo_rotate, &image, rotate);
513         }
514
515         fb_do_show_logo(info, &image, rotate, n);
516
517         kfree(palette);
518         if (saved_pseudo_palette != NULL)
519                 info->pseudo_palette = saved_pseudo_palette;
520         kfree(logo_new);
521         kfree(logo_rotate);
522         return logo->height;
523 }
524
525
526 #ifdef CONFIG_FB_LOGO_EXTRA
527
528 #define FB_LOGO_EX_NUM_MAX 10
529 static struct logo_data_extra {
530         const struct linux_logo *logo;
531         unsigned int n;
532 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
533 static unsigned int fb_logo_ex_num;
534
535 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
536 {
537         if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
538                 return;
539
540         fb_logo_ex[fb_logo_ex_num].logo = logo;
541         fb_logo_ex[fb_logo_ex_num].n = n;
542         fb_logo_ex_num++;
543 }
544
545 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
546                                   unsigned int yres)
547 {
548         unsigned int i;
549
550         /* FIXME: logo_ex supports only truecolor fb. */
551         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
552                 fb_logo_ex_num = 0;
553
554         for (i = 0; i < fb_logo_ex_num; i++) {
555                 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
556                         fb_logo_ex[i].logo = NULL;
557                         continue;
558                 }
559                 height += fb_logo_ex[i].logo->height;
560                 if (height > yres) {
561                         height -= fb_logo_ex[i].logo->height;
562                         fb_logo_ex_num = i;
563                         break;
564                 }
565         }
566         return height;
567 }
568
569 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
570 {
571         unsigned int i;
572
573         for (i = 0; i < fb_logo_ex_num; i++)
574                 y += fb_show_logo_line(info, rotate,
575                                        fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
576
577         return y;
578 }
579
580 #else /* !CONFIG_FB_LOGO_EXTRA */
581
582 static inline int fb_prepare_extra_logos(struct fb_info *info,
583                                          unsigned int height,
584                                          unsigned int yres)
585 {
586         return height;
587 }
588
589 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
590 {
591         return y;
592 }
593
594 #endif /* CONFIG_FB_LOGO_EXTRA */
595
596
597 int fb_prepare_logo(struct fb_info *info, int rotate)
598 {
599         int depth = fb_get_color_depth(&info->var, &info->fix);
600         unsigned int yres;
601
602         memset(&fb_logo, 0, sizeof(struct logo_data));
603
604         if (info->flags & FBINFO_MISC_TILEBLITTING ||
605             info->fbops->owner)
606                 return 0;
607
608         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
609                 depth = info->var.blue.length;
610                 if (info->var.red.length < depth)
611                         depth = info->var.red.length;
612                 if (info->var.green.length < depth)
613                         depth = info->var.green.length;
614         }
615
616         if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
617                 /* assume console colormap */
618                 depth = 4;
619         }
620
621         /* Return if no suitable logo was found */
622         fb_logo.logo = fb_find_logo(depth);
623
624         if (!fb_logo.logo) {
625                 return 0;
626         }
627
628         if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
629                 yres = info->var.yres;
630         else
631                 yres = info->var.xres;
632
633         if (fb_logo.logo->height > yres) {
634                 fb_logo.logo = NULL;
635                 return 0;
636         }
637
638         /* What depth we asked for might be different from what we get */
639         if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
640                 fb_logo.depth = 8;
641         else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
642                 fb_logo.depth = 4;
643         else
644                 fb_logo.depth = 1;
645
646
647         if (fb_logo.depth > 4 && depth > 4) {
648                 switch (info->fix.visual) {
649                 case FB_VISUAL_TRUECOLOR:
650                         fb_logo.needs_truepalette = 1;
651                         break;
652                 case FB_VISUAL_DIRECTCOLOR:
653                         fb_logo.needs_directpalette = 1;
654                         fb_logo.needs_cmapreset = 1;
655                         break;
656                 case FB_VISUAL_PSEUDOCOLOR:
657                         fb_logo.needs_cmapreset = 1;
658                         break;
659                 }
660         }
661
662         return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
663 }
664
665 int fb_show_logo(struct fb_info *info, int rotate)
666 {
667         int y;
668
669         y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
670                               num_online_cpus());
671         y = fb_show_extra_logos(info, y, rotate);
672
673         return y;
674 }
675 #else
676 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
677 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
678 #endif /* CONFIG_LOGO */
679 EXPORT_SYMBOL(fb_prepare_logo);
680 EXPORT_SYMBOL(fb_show_logo);
681
682 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
683 {
684         mutex_lock(&registration_lock);
685         return (*pos < FB_MAX) ? pos : NULL;
686 }
687
688 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
689 {
690         (*pos)++;
691         return (*pos < FB_MAX) ? pos : NULL;
692 }
693
694 static void fb_seq_stop(struct seq_file *m, void *v)
695 {
696         mutex_unlock(&registration_lock);
697 }
698
699 static int fb_seq_show(struct seq_file *m, void *v)
700 {
701         int i = *(loff_t *)v;
702         struct fb_info *fi = registered_fb[i];
703
704         if (fi)
705                 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
706         return 0;
707 }
708
709 static const struct seq_operations proc_fb_seq_ops = {
710         .start  = fb_seq_start,
711         .next   = fb_seq_next,
712         .stop   = fb_seq_stop,
713         .show   = fb_seq_show,
714 };
715
716 static int proc_fb_open(struct inode *inode, struct file *file)
717 {
718         return seq_open(file, &proc_fb_seq_ops);
719 }
720
721 static const struct file_operations fb_proc_fops = {
722         .owner          = THIS_MODULE,
723         .open           = proc_fb_open,
724         .read           = seq_read,
725         .llseek         = seq_lseek,
726         .release        = seq_release,
727 };
728
729 /*
730  * We hold a reference to the fb_info in file->private_data,
731  * but if the current registered fb has changed, we don't
732  * actually want to use it.
733  *
734  * So look up the fb_info using the inode minor number,
735  * and just verify it against the reference we have.
736  */
737 static struct fb_info *file_fb_info(struct file *file)
738 {
739         struct inode *inode = file_inode(file);
740         int fbidx = iminor(inode);
741         struct fb_info *info = registered_fb[fbidx];
742
743         if (info != file->private_data)
744                 info = NULL;
745         return info;
746 }
747
748 static ssize_t
749 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
750 {
751         unsigned long p = *ppos;
752         struct fb_info *info = file_fb_info(file);
753         u8 *buffer, *dst;
754         u8 __iomem *src;
755         int c, cnt = 0, err = 0;
756         unsigned long total_size;
757
758         if (!info || ! info->screen_base)
759                 return -ENODEV;
760
761         if (info->state != FBINFO_STATE_RUNNING)
762                 return -EPERM;
763
764         if (info->fbops->fb_read)
765                 return info->fbops->fb_read(info, buf, count, ppos);
766         
767         total_size = info->screen_size;
768
769         if (total_size == 0)
770                 total_size = info->fix.smem_len;
771
772         if (p >= total_size)
773                 return 0;
774
775         if (count >= total_size)
776                 count = total_size;
777
778         if (count + p > total_size)
779                 count = total_size - p;
780
781         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
782                          GFP_KERNEL);
783         if (!buffer)
784                 return -ENOMEM;
785
786         src = (u8 __iomem *) (info->screen_base + p);
787
788         if (info->fbops->fb_sync)
789                 info->fbops->fb_sync(info);
790
791         while (count) {
792                 c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
793                 dst = buffer;
794                 fb_memcpy_fromfb(dst, src, c);
795                 dst += c;
796                 src += c;
797
798                 if (copy_to_user(buf, buffer, c)) {
799                         err = -EFAULT;
800                         break;
801                 }
802                 *ppos += c;
803                 buf += c;
804                 cnt += c;
805                 count -= c;
806         }
807
808         kfree(buffer);
809
810         return (err) ? err : cnt;
811 }
812
813 static ssize_t
814 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
815 {
816         unsigned long p = *ppos;
817         struct fb_info *info = file_fb_info(file);
818         u8 *buffer, *src;
819         u8 __iomem *dst;
820         int c, cnt = 0, err = 0;
821         unsigned long total_size;
822
823         if (!info || !info->screen_base)
824                 return -ENODEV;
825
826         if (info->state != FBINFO_STATE_RUNNING)
827                 return -EPERM;
828
829         if (info->fbops->fb_write)
830                 return info->fbops->fb_write(info, buf, count, ppos);
831         
832         total_size = info->screen_size;
833
834         if (total_size == 0)
835                 total_size = info->fix.smem_len;
836
837         if (p > total_size)
838                 return -EFBIG;
839
840         if (count > total_size) {
841                 err = -EFBIG;
842                 count = total_size;
843         }
844
845         if (count + p > total_size) {
846                 if (!err)
847                         err = -ENOSPC;
848
849                 count = total_size - p;
850         }
851
852         buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
853                          GFP_KERNEL);
854         if (!buffer)
855                 return -ENOMEM;
856
857         dst = (u8 __iomem *) (info->screen_base + p);
858
859         if (info->fbops->fb_sync)
860                 info->fbops->fb_sync(info);
861
862         while (count) {
863                 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
864                 src = buffer;
865
866                 if (copy_from_user(src, buf, c)) {
867                         err = -EFAULT;
868                         break;
869                 }
870
871                 fb_memcpy_tofb(dst, src, c);
872                 dst += c;
873                 src += c;
874                 *ppos += c;
875                 buf += c;
876                 cnt += c;
877                 count -= c;
878         }
879
880         kfree(buffer);
881
882         return (cnt) ? cnt : err;
883 }
884
885 int
886 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
887 {
888         struct fb_fix_screeninfo *fix = &info->fix;
889         unsigned int yres = info->var.yres;
890         int err = 0;
891
892         if (var->yoffset > 0) {
893                 if (var->vmode & FB_VMODE_YWRAP) {
894                         if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
895                                 err = -EINVAL;
896                         else
897                                 yres = 0;
898                 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
899                         err = -EINVAL;
900         }
901
902         if (var->xoffset > 0 && (!fix->xpanstep ||
903                                  (var->xoffset % fix->xpanstep)))
904                 err = -EINVAL;
905
906         if (err || !info->fbops->fb_pan_display ||
907             var->yoffset > info->var.yres_virtual - yres ||
908             var->xoffset > info->var.xres_virtual - info->var.xres)
909                 return -EINVAL;
910
911         if ((err = info->fbops->fb_pan_display(var, info)))
912                 return err;
913         info->var.xoffset = var->xoffset;
914         info->var.yoffset = var->yoffset;
915         if (var->vmode & FB_VMODE_YWRAP)
916                 info->var.vmode |= FB_VMODE_YWRAP;
917         else
918                 info->var.vmode &= ~FB_VMODE_YWRAP;
919         return 0;
920 }
921 EXPORT_SYMBOL(fb_pan_display);
922
923 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
924                          u32 activate)
925 {
926         struct fb_event event;
927         struct fb_blit_caps caps, fbcaps;
928         int err = 0;
929
930         memset(&caps, 0, sizeof(caps));
931         memset(&fbcaps, 0, sizeof(fbcaps));
932         caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
933         event.info = info;
934         event.data = &caps;
935         fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
936         info->fbops->fb_get_caps(info, &fbcaps, var);
937
938         if (((fbcaps.x ^ caps.x) & caps.x) ||
939             ((fbcaps.y ^ caps.y) & caps.y) ||
940             (fbcaps.len < caps.len))
941                 err = -EINVAL;
942
943         return err;
944 }
945
946 int
947 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
948 {
949         int flags = info->flags;
950         int ret = 0;
951
952         if (var->activate & FB_ACTIVATE_INV_MODE) {
953                 struct fb_videomode mode1, mode2;
954
955                 fb_var_to_videomode(&mode1, var);
956                 fb_var_to_videomode(&mode2, &info->var);
957                 /* make sure we don't delete the videomode of current var */
958                 ret = fb_mode_is_equal(&mode1, &mode2);
959
960                 if (!ret) {
961                     struct fb_event event;
962
963                     event.info = info;
964                     event.data = &mode1;
965                     ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
966                 }
967
968                 if (!ret)
969                     fb_delete_videomode(&mode1, &info->modelist);
970
971
972                 ret = (ret) ? -EINVAL : 0;
973                 goto done;
974         }
975
976         if ((var->activate & FB_ACTIVATE_FORCE) ||
977             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
978                 u32 activate = var->activate;
979
980                 /* When using FOURCC mode, make sure the red, green, blue and
981                  * transp fields are set to 0.
982                  */
983                 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
984                     var->grayscale > 1) {
985                         if (var->red.offset     || var->green.offset    ||
986                             var->blue.offset    || var->transp.offset   ||
987                             var->red.length     || var->green.length    ||
988                             var->blue.length    || var->transp.length   ||
989                             var->red.msb_right  || var->green.msb_right ||
990                             var->blue.msb_right || var->transp.msb_right)
991                                 return -EINVAL;
992                 }
993
994                 if (!info->fbops->fb_check_var) {
995                         *var = info->var;
996                         goto done;
997                 }
998
999                 ret = info->fbops->fb_check_var(var, info);
1000
1001                 if (ret)
1002                         goto done;
1003
1004                 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
1005                         struct fb_var_screeninfo old_var;
1006                         struct fb_videomode mode;
1007
1008                         if (info->fbops->fb_get_caps) {
1009                                 ret = fb_check_caps(info, var, activate);
1010
1011                                 if (ret)
1012                                         goto done;
1013                         }
1014
1015                         old_var = info->var;
1016                         info->var = *var;
1017
1018                         if (info->fbops->fb_set_par) {
1019                                 ret = info->fbops->fb_set_par(info);
1020
1021                                 if (ret) {
1022                                         info->var = old_var;
1023                                         printk(KERN_WARNING "detected "
1024                                                 "fb_set_par error, "
1025                                                 "error code: %d\n", ret);
1026                                         goto done;
1027                                 }
1028                         }
1029
1030                         fb_pan_display(info, &info->var);
1031                         fb_set_cmap(&info->cmap, info);
1032                         fb_var_to_videomode(&mode, &info->var);
1033
1034                         if (info->modelist.prev && info->modelist.next &&
1035                             !list_empty(&info->modelist))
1036                                 ret = fb_add_videomode(&mode, &info->modelist);
1037
1038                         if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
1039                                 struct fb_event event;
1040                                 int evnt = (activate & FB_ACTIVATE_ALL) ?
1041                                         FB_EVENT_MODE_CHANGE_ALL :
1042                                         FB_EVENT_MODE_CHANGE;
1043
1044                                 info->flags &= ~FBINFO_MISC_USEREVENT;
1045                                 event.info = info;
1046                                 event.data = &mode;
1047                                 fb_notifier_call_chain(evnt, &event);
1048                         }
1049                 }
1050         }
1051
1052  done:
1053         return ret;
1054 }
1055 EXPORT_SYMBOL(fb_set_var);
1056
1057 int
1058 fb_blank(struct fb_info *info, int blank)
1059 {       
1060         struct fb_event event;
1061         int ret = -EINVAL, early_ret;
1062
1063         if (blank > FB_BLANK_POWERDOWN)
1064                 blank = FB_BLANK_POWERDOWN;
1065
1066         event.info = info;
1067         event.data = &blank;
1068
1069         early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
1070
1071         if (info->fbops->fb_blank)
1072                 ret = info->fbops->fb_blank(blank, info);
1073
1074         if (!ret)
1075                 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1076         else {
1077                 /*
1078                  * if fb_blank is failed then revert effects of
1079                  * the early blank event.
1080                  */
1081                 if (!early_ret)
1082                         fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
1083         }
1084
1085         return ret;
1086 }
1087 EXPORT_SYMBOL(fb_blank);
1088
1089 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1090                         unsigned long arg)
1091 {
1092         struct fb_ops *fb;
1093         struct fb_var_screeninfo var;
1094         struct fb_fix_screeninfo fix;
1095         struct fb_con2fbmap con2fb;
1096         struct fb_cmap cmap_from;
1097         struct fb_cmap_user cmap;
1098         struct fb_event event;
1099         void __user *argp = (void __user *)arg;
1100         long ret = 0;
1101
1102         switch (cmd) {
1103         case FBIOGET_VSCREENINFO:
1104                 if (!lock_fb_info(info))
1105                         return -ENODEV;
1106                 var = info->var;
1107                 unlock_fb_info(info);
1108
1109                 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1110                 break;
1111         case FBIOPUT_VSCREENINFO:
1112                 if (copy_from_user(&var, argp, sizeof(var)))
1113                         return -EFAULT;
1114                 console_lock();
1115                 if (!lock_fb_info(info)) {
1116                         console_unlock();
1117                         return -ENODEV;
1118                 }
1119                 info->flags |= FBINFO_MISC_USEREVENT;
1120                 ret = fb_set_var(info, &var);
1121                 info->flags &= ~FBINFO_MISC_USEREVENT;
1122                 unlock_fb_info(info);
1123                 console_unlock();
1124                 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1125                         ret = -EFAULT;
1126                 break;
1127         case FBIOGET_FSCREENINFO:
1128                 if (!lock_fb_info(info))
1129                         return -ENODEV;
1130                 fix = info->fix;
1131                 unlock_fb_info(info);
1132
1133                 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1134                 break;
1135         case FBIOPUTCMAP:
1136                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1137                         return -EFAULT;
1138                 ret = fb_set_user_cmap(&cmap, info);
1139                 break;
1140         case FBIOGETCMAP:
1141                 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1142                         return -EFAULT;
1143                 if (!lock_fb_info(info))
1144                         return -ENODEV;
1145                 cmap_from = info->cmap;
1146                 unlock_fb_info(info);
1147                 ret = fb_cmap_to_user(&cmap_from, &cmap);
1148                 break;
1149         case FBIOPAN_DISPLAY:
1150                 if (copy_from_user(&var, argp, sizeof(var)))
1151                         return -EFAULT;
1152                 console_lock();
1153                 if (!lock_fb_info(info)) {
1154                         console_unlock();
1155                         return -ENODEV;
1156                 }
1157                 ret = fb_pan_display(info, &var);
1158                 unlock_fb_info(info);
1159                 console_unlock();
1160                 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1161                         return -EFAULT;
1162                 break;
1163         case FBIO_CURSOR:
1164                 ret = -EINVAL;
1165                 break;
1166         case FBIOGET_CON2FBMAP:
1167                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1168                         return -EFAULT;
1169                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1170                         return -EINVAL;
1171                 con2fb.framebuffer = -1;
1172                 event.data = &con2fb;
1173                 if (!lock_fb_info(info))
1174                         return -ENODEV;
1175                 event.info = info;
1176                 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1177                 unlock_fb_info(info);
1178                 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1179                 break;
1180         case FBIOPUT_CON2FBMAP:
1181                 if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1182                         return -EFAULT;
1183                 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1184                         return -EINVAL;
1185                 if (con2fb.framebuffer >= FB_MAX)
1186                         return -EINVAL;
1187                 if (!registered_fb[con2fb.framebuffer])
1188                         request_module("fb%d", con2fb.framebuffer);
1189                 if (!registered_fb[con2fb.framebuffer]) {
1190                         ret = -EINVAL;
1191                         break;
1192                 }
1193                 event.data = &con2fb;
1194                 console_lock();
1195                 if (!lock_fb_info(info)) {
1196                         console_unlock();
1197                         return -ENODEV;
1198                 }
1199                 event.info = info;
1200                 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1201                 unlock_fb_info(info);
1202                 console_unlock();
1203                 break;
1204         case FBIOBLANK:
1205                 console_lock();
1206                 if (!lock_fb_info(info)) {
1207                         console_unlock();
1208                         return -ENODEV;
1209                 }
1210                 info->flags |= FBINFO_MISC_USEREVENT;
1211                 ret = fb_blank(info, arg);
1212                 info->flags &= ~FBINFO_MISC_USEREVENT;
1213                 unlock_fb_info(info);
1214                 console_unlock();
1215                 break;
1216         default:
1217                 if (!lock_fb_info(info))
1218                         return -ENODEV;
1219                 fb = info->fbops;
1220                 if (fb->fb_ioctl)
1221                         ret = fb->fb_ioctl(info, cmd, arg);
1222                 else
1223                         ret = -ENOTTY;
1224                 unlock_fb_info(info);
1225         }
1226         return ret;
1227 }
1228
1229 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1230 {
1231         struct fb_info *info = file_fb_info(file);
1232
1233         if (!info)
1234                 return -ENODEV;
1235         return do_fb_ioctl(info, cmd, arg);
1236 }
1237
1238 #ifdef CONFIG_COMPAT
1239 struct fb_fix_screeninfo32 {
1240         char                    id[16];
1241         compat_caddr_t          smem_start;
1242         u32                     smem_len;
1243         u32                     type;
1244         u32                     type_aux;
1245         u32                     visual;
1246         u16                     xpanstep;
1247         u16                     ypanstep;
1248         u16                     ywrapstep;
1249         u32                     line_length;
1250         compat_caddr_t          mmio_start;
1251         u32                     mmio_len;
1252         u32                     accel;
1253         u16                     reserved[3];
1254 };
1255
1256 struct fb_cmap32 {
1257         u32                     start;
1258         u32                     len;
1259         compat_caddr_t  red;
1260         compat_caddr_t  green;
1261         compat_caddr_t  blue;
1262         compat_caddr_t  transp;
1263 };
1264
1265 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1266                           unsigned long arg)
1267 {
1268         struct fb_cmap_user __user *cmap;
1269         struct fb_cmap32 __user *cmap32;
1270         __u32 data;
1271         int err;
1272
1273         cmap = compat_alloc_user_space(sizeof(*cmap));
1274         cmap32 = compat_ptr(arg);
1275
1276         if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1277                 return -EFAULT;
1278
1279         if (get_user(data, &cmap32->red) ||
1280             put_user(compat_ptr(data), &cmap->red) ||
1281             get_user(data, &cmap32->green) ||
1282             put_user(compat_ptr(data), &cmap->green) ||
1283             get_user(data, &cmap32->blue) ||
1284             put_user(compat_ptr(data), &cmap->blue) ||
1285             get_user(data, &cmap32->transp) ||
1286             put_user(compat_ptr(data), &cmap->transp))
1287                 return -EFAULT;
1288
1289         err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1290
1291         if (!err) {
1292                 if (copy_in_user(&cmap32->start,
1293                                  &cmap->start,
1294                                  2 * sizeof(__u32)))
1295                         err = -EFAULT;
1296         }
1297         return err;
1298 }
1299
1300 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1301                                   struct fb_fix_screeninfo32 __user *fix32)
1302 {
1303         __u32 data;
1304         int err;
1305
1306         err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1307
1308         data = (__u32) (unsigned long) fix->smem_start;
1309         err |= put_user(data, &fix32->smem_start);
1310
1311         err |= put_user(fix->smem_len, &fix32->smem_len);
1312         err |= put_user(fix->type, &fix32->type);
1313         err |= put_user(fix->type_aux, &fix32->type_aux);
1314         err |= put_user(fix->visual, &fix32->visual);
1315         err |= put_user(fix->xpanstep, &fix32->xpanstep);
1316         err |= put_user(fix->ypanstep, &fix32->ypanstep);
1317         err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1318         err |= put_user(fix->line_length, &fix32->line_length);
1319
1320         data = (__u32) (unsigned long) fix->mmio_start;
1321         err |= put_user(data, &fix32->mmio_start);
1322
1323         err |= put_user(fix->mmio_len, &fix32->mmio_len);
1324         err |= put_user(fix->accel, &fix32->accel);
1325         err |= copy_to_user(fix32->reserved, fix->reserved,
1326                             sizeof(fix->reserved));
1327
1328         if (err)
1329                 return -EFAULT;
1330         return 0;
1331 }
1332
1333 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1334                               unsigned long arg)
1335 {
1336         struct fb_fix_screeninfo fix;
1337
1338         if (!lock_fb_info(info))
1339                 return -ENODEV;
1340         fix = info->fix;
1341         unlock_fb_info(info);
1342         return do_fscreeninfo_to_user(&fix, compat_ptr(arg));
1343 }
1344
1345 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1346                             unsigned long arg)
1347 {
1348         struct fb_info *info = file_fb_info(file);
1349         struct fb_ops *fb;
1350         long ret = -ENOIOCTLCMD;
1351
1352         if (!info)
1353                 return -ENODEV;
1354         fb = info->fbops;
1355         switch(cmd) {
1356         case FBIOGET_VSCREENINFO:
1357         case FBIOPUT_VSCREENINFO:
1358         case FBIOPAN_DISPLAY:
1359         case FBIOGET_CON2FBMAP:
1360         case FBIOPUT_CON2FBMAP:
1361                 arg = (unsigned long) compat_ptr(arg);
1362         case FBIOBLANK:
1363                 ret = do_fb_ioctl(info, cmd, arg);
1364                 break;
1365
1366         case FBIOGET_FSCREENINFO:
1367                 ret = fb_get_fscreeninfo(info, cmd, arg);
1368                 break;
1369
1370         case FBIOGETCMAP:
1371         case FBIOPUTCMAP:
1372                 ret = fb_getput_cmap(info, cmd, arg);
1373                 break;
1374
1375         default:
1376                 if (fb->fb_compat_ioctl)
1377                         ret = fb->fb_compat_ioctl(info, cmd, arg);
1378                 break;
1379         }
1380         return ret;
1381 }
1382 #endif
1383
1384 static int
1385 fb_mmap(struct file *file, struct vm_area_struct * vma)
1386 {
1387         struct fb_info *info = file_fb_info(file);
1388         struct fb_ops *fb;
1389         unsigned long mmio_pgoff;
1390         unsigned long start;
1391         u32 len;
1392
1393         if (!info)
1394                 return -ENODEV;
1395         fb = info->fbops;
1396         if (!fb)
1397                 return -ENODEV;
1398         mutex_lock(&info->mm_lock);
1399         if (fb->fb_mmap) {
1400                 int res;
1401
1402                 /*
1403                  * The framebuffer needs to be accessed decrypted, be sure
1404                  * SME protection is removed ahead of the call
1405                  */
1406                 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1407                 res = fb->fb_mmap(info, vma);
1408                 mutex_unlock(&info->mm_lock);
1409                 return res;
1410         }
1411
1412         /*
1413          * Ugh. This can be either the frame buffer mapping, or
1414          * if pgoff points past it, the mmio mapping.
1415          */
1416         start = info->fix.smem_start;
1417         len = info->fix.smem_len;
1418         mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1419         if (vma->vm_pgoff >= mmio_pgoff) {
1420                 if (info->var.accel_flags) {
1421                         mutex_unlock(&info->mm_lock);
1422                         return -EINVAL;
1423                 }
1424
1425                 vma->vm_pgoff -= mmio_pgoff;
1426                 start = info->fix.mmio_start;
1427                 len = info->fix.mmio_len;
1428         }
1429         mutex_unlock(&info->mm_lock);
1430
1431         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1432         /*
1433          * The framebuffer needs to be accessed decrypted, be sure
1434          * SME protection is removed
1435          */
1436         vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1437         fb_pgprotect(file, vma, start);
1438
1439         return vm_iomap_memory(vma, start, len);
1440 }
1441
1442 static int
1443 fb_open(struct inode *inode, struct file *file)
1444 __acquires(&info->lock)
1445 __releases(&info->lock)
1446 {
1447         int fbidx = iminor(inode);
1448         struct fb_info *info;
1449         int res = 0;
1450
1451         info = get_fb_info(fbidx);
1452         if (!info) {
1453                 request_module("fb%d", fbidx);
1454                 info = get_fb_info(fbidx);
1455                 if (!info)
1456                         return -ENODEV;
1457         }
1458         if (IS_ERR(info))
1459                 return PTR_ERR(info);
1460
1461         mutex_lock(&info->lock);
1462         if (!try_module_get(info->fbops->owner)) {
1463                 res = -ENODEV;
1464                 goto out;
1465         }
1466         file->private_data = info;
1467         if (info->fbops->fb_open) {
1468                 res = info->fbops->fb_open(info,1);
1469                 if (res)
1470                         module_put(info->fbops->owner);
1471         }
1472 #ifdef CONFIG_FB_DEFERRED_IO
1473         if (info->fbdefio)
1474                 fb_deferred_io_open(info, inode, file);
1475 #endif
1476 out:
1477         mutex_unlock(&info->lock);
1478         if (res)
1479                 put_fb_info(info);
1480         return res;
1481 }
1482
1483 static int 
1484 fb_release(struct inode *inode, struct file *file)
1485 __acquires(&info->lock)
1486 __releases(&info->lock)
1487 {
1488         struct fb_info * const info = file->private_data;
1489
1490         mutex_lock(&info->lock);
1491         if (info->fbops->fb_release)
1492                 info->fbops->fb_release(info,1);
1493         module_put(info->fbops->owner);
1494         mutex_unlock(&info->lock);
1495         put_fb_info(info);
1496         return 0;
1497 }
1498
1499 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU)
1500 unsigned long get_fb_unmapped_area(struct file *filp,
1501                                    unsigned long addr, unsigned long len,
1502                                    unsigned long pgoff, unsigned long flags)
1503 {
1504         struct fb_info * const info = filp->private_data;
1505         unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
1506
1507         if (pgoff > fb_size || len > fb_size - pgoff)
1508                 return -EINVAL;
1509
1510         return (unsigned long)info->screen_base + pgoff;
1511 }
1512 #endif
1513
1514 static const struct file_operations fb_fops = {
1515         .owner =        THIS_MODULE,
1516         .read =         fb_read,
1517         .write =        fb_write,
1518         .unlocked_ioctl = fb_ioctl,
1519 #ifdef CONFIG_COMPAT
1520         .compat_ioctl = fb_compat_ioctl,
1521 #endif
1522         .mmap =         fb_mmap,
1523         .open =         fb_open,
1524         .release =      fb_release,
1525 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \
1526         (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \
1527          !defined(CONFIG_MMU))
1528         .get_unmapped_area = get_fb_unmapped_area,
1529 #endif
1530 #ifdef CONFIG_FB_DEFERRED_IO
1531         .fsync =        fb_deferred_io_fsync,
1532 #endif
1533         .llseek =       default_llseek,
1534 };
1535
1536 struct class *fb_class;
1537 EXPORT_SYMBOL(fb_class);
1538
1539 static int fb_check_foreignness(struct fb_info *fi)
1540 {
1541         const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1542
1543         fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1544
1545 #ifdef __BIG_ENDIAN
1546         fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1547 #else
1548         fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1549 #endif /* __BIG_ENDIAN */
1550
1551         if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1552                 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1553                        "support this framebuffer\n", fi->fix.id);
1554                 return -ENOSYS;
1555         } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1556                 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1557                        "support this framebuffer\n", fi->fix.id);
1558                 return -ENOSYS;
1559         }
1560
1561         return 0;
1562 }
1563
1564 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1565 {
1566         /* is the generic aperture base the same as the HW one */
1567         if (gen->base == hw->base)
1568                 return true;
1569         /* is the generic aperture base inside the hw base->hw base+size */
1570         if (gen->base > hw->base && gen->base < hw->base + hw->size)
1571                 return true;
1572         return false;
1573 }
1574
1575 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1576                                     struct apertures_struct *hwa)
1577 {
1578         int i, j;
1579         if (!hwa || !gena)
1580                 return false;
1581
1582         for (i = 0; i < hwa->count; ++i) {
1583                 struct aperture *h = &hwa->ranges[i];
1584                 for (j = 0; j < gena->count; ++j) {
1585                         struct aperture *g = &gena->ranges[j];
1586                         printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1587                                 (unsigned long long)g->base,
1588                                 (unsigned long long)g->size,
1589                                 (unsigned long long)h->base,
1590                                 (unsigned long long)h->size);
1591                         if (apertures_overlap(g, h))
1592                                 return true;
1593                 }
1594         }
1595
1596         return false;
1597 }
1598
1599 static int do_unregister_framebuffer(struct fb_info *fb_info);
1600
1601 #define VGA_FB_PHYS 0xA0000
1602 static int do_remove_conflicting_framebuffers(struct apertures_struct *a,
1603                                               const char *name, bool primary)
1604 {
1605         int i, ret;
1606
1607         /* check all firmware fbs and kick off if the base addr overlaps */
1608         for (i = 0 ; i < FB_MAX; i++) {
1609                 struct apertures_struct *gen_aper;
1610                 if (!registered_fb[i])
1611                         continue;
1612
1613                 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1614                         continue;
1615
1616                 gen_aper = registered_fb[i]->apertures;
1617                 if (fb_do_apertures_overlap(gen_aper, a) ||
1618                         (primary && gen_aper && gen_aper->count &&
1619                          gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1620
1621                         printk(KERN_INFO "fb: switching to %s from %s\n",
1622                                name, registered_fb[i]->fix.id);
1623                         ret = do_unregister_framebuffer(registered_fb[i]);
1624                         if (ret)
1625                                 return ret;
1626                 }
1627         }
1628
1629         return 0;
1630 }
1631
1632 static bool lockless_register_fb;
1633 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
1634 MODULE_PARM_DESC(lockless_register_fb,
1635         "Lockless framebuffer registration for debugging [default=off]");
1636
1637 static int do_register_framebuffer(struct fb_info *fb_info)
1638 {
1639         int i, ret;
1640         struct fb_event event;
1641         struct fb_videomode mode;
1642
1643         if (fb_check_foreignness(fb_info))
1644                 return -ENOSYS;
1645
1646         ret = do_remove_conflicting_framebuffers(fb_info->apertures,
1647                                                  fb_info->fix.id,
1648                                                  fb_is_primary_device(fb_info));
1649         if (ret)
1650                 return ret;
1651
1652         if (num_registered_fb == FB_MAX)
1653                 return -ENXIO;
1654
1655         num_registered_fb++;
1656         for (i = 0 ; i < FB_MAX; i++)
1657                 if (!registered_fb[i])
1658                         break;
1659         fb_info->node = i;
1660         atomic_set(&fb_info->count, 1);
1661         mutex_init(&fb_info->lock);
1662         mutex_init(&fb_info->mm_lock);
1663
1664         fb_info->dev = device_create(fb_class, fb_info->device,
1665                                      MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1666         if (IS_ERR(fb_info->dev)) {
1667                 /* Not fatal */
1668                 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1669                 fb_info->dev = NULL;
1670         } else
1671                 fb_init_device(fb_info);
1672
1673         if (fb_info->pixmap.addr == NULL) {
1674                 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1675                 if (fb_info->pixmap.addr) {
1676                         fb_info->pixmap.size = FBPIXMAPSIZE;
1677                         fb_info->pixmap.buf_align = 1;
1678                         fb_info->pixmap.scan_align = 1;
1679                         fb_info->pixmap.access_align = 32;
1680                         fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1681                 }
1682         }       
1683         fb_info->pixmap.offset = 0;
1684
1685         if (!fb_info->pixmap.blit_x)
1686                 fb_info->pixmap.blit_x = ~(u32)0;
1687
1688         if (!fb_info->pixmap.blit_y)
1689                 fb_info->pixmap.blit_y = ~(u32)0;
1690
1691         if (!fb_info->modelist.prev || !fb_info->modelist.next)
1692                 INIT_LIST_HEAD(&fb_info->modelist);
1693
1694         if (fb_info->skip_vt_switch)
1695                 pm_vt_switch_required(fb_info->dev, false);
1696         else
1697                 pm_vt_switch_required(fb_info->dev, true);
1698
1699         fb_var_to_videomode(&mode, &fb_info->var);
1700         fb_add_videomode(&mode, &fb_info->modelist);
1701         registered_fb[i] = fb_info;
1702
1703         event.info = fb_info;
1704         if (!lockless_register_fb)
1705                 console_lock();
1706         if (!lock_fb_info(fb_info)) {
1707                 if (!lockless_register_fb)
1708                         console_unlock();
1709                 return -ENODEV;
1710         }
1711
1712         fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1713         unlock_fb_info(fb_info);
1714         if (!lockless_register_fb)
1715                 console_unlock();
1716         return 0;
1717 }
1718
1719 static int do_unregister_framebuffer(struct fb_info *fb_info)
1720 {
1721         struct fb_event event;
1722         int i, ret = 0;
1723
1724         i = fb_info->node;
1725         if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1726                 return -EINVAL;
1727
1728         console_lock();
1729         if (!lock_fb_info(fb_info)) {
1730                 console_unlock();
1731                 return -ENODEV;
1732         }
1733
1734         event.info = fb_info;
1735         ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1736         unlock_fb_info(fb_info);
1737         console_unlock();
1738
1739         if (ret)
1740                 return -EINVAL;
1741
1742         pm_vt_switch_unregister(fb_info->dev);
1743
1744         unlink_framebuffer(fb_info);
1745         if (fb_info->pixmap.addr &&
1746             (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1747                 kfree(fb_info->pixmap.addr);
1748         fb_destroy_modelist(&fb_info->modelist);
1749         registered_fb[i] = NULL;
1750         num_registered_fb--;
1751         fb_cleanup_device(fb_info);
1752         event.info = fb_info;
1753         console_lock();
1754         fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1755         console_unlock();
1756
1757         /* this may free fb info */
1758         put_fb_info(fb_info);
1759         return 0;
1760 }
1761
1762 int unlink_framebuffer(struct fb_info *fb_info)
1763 {
1764         int i;
1765
1766         i = fb_info->node;
1767         if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1768                 return -EINVAL;
1769
1770         if (fb_info->dev) {
1771                 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1772                 fb_info->dev = NULL;
1773         }
1774         return 0;
1775 }
1776 EXPORT_SYMBOL(unlink_framebuffer);
1777
1778 int remove_conflicting_framebuffers(struct apertures_struct *a,
1779                                     const char *name, bool primary)
1780 {
1781         int ret;
1782
1783         mutex_lock(&registration_lock);
1784         ret = do_remove_conflicting_framebuffers(a, name, primary);
1785         mutex_unlock(&registration_lock);
1786
1787         return ret;
1788 }
1789 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1790
1791 /**
1792  *      register_framebuffer - registers a frame buffer device
1793  *      @fb_info: frame buffer info structure
1794  *
1795  *      Registers a frame buffer device @fb_info.
1796  *
1797  *      Returns negative errno on error, or zero for success.
1798  *
1799  */
1800 int
1801 register_framebuffer(struct fb_info *fb_info)
1802 {
1803         int ret;
1804
1805         mutex_lock(&registration_lock);
1806         ret = do_register_framebuffer(fb_info);
1807         mutex_unlock(&registration_lock);
1808
1809         return ret;
1810 }
1811 EXPORT_SYMBOL(register_framebuffer);
1812
1813 /**
1814  *      unregister_framebuffer - releases a frame buffer device
1815  *      @fb_info: frame buffer info structure
1816  *
1817  *      Unregisters a frame buffer device @fb_info.
1818  *
1819  *      Returns negative errno on error, or zero for success.
1820  *
1821  *      This function will also notify the framebuffer console
1822  *      to release the driver.
1823  *
1824  *      This is meant to be called within a driver's module_exit()
1825  *      function. If this is called outside module_exit(), ensure
1826  *      that the driver implements fb_open() and fb_release() to
1827  *      check that no processes are using the device.
1828  */
1829 int
1830 unregister_framebuffer(struct fb_info *fb_info)
1831 {
1832         int ret;
1833
1834         mutex_lock(&registration_lock);
1835         ret = do_unregister_framebuffer(fb_info);
1836         mutex_unlock(&registration_lock);
1837
1838         return ret;
1839 }
1840 EXPORT_SYMBOL(unregister_framebuffer);
1841
1842 /**
1843  *      fb_set_suspend - low level driver signals suspend
1844  *      @info: framebuffer affected
1845  *      @state: 0 = resuming, !=0 = suspending
1846  *
1847  *      This is meant to be used by low level drivers to
1848  *      signal suspend/resume to the core & clients.
1849  *      It must be called with the console semaphore held
1850  */
1851 void fb_set_suspend(struct fb_info *info, int state)
1852 {
1853         struct fb_event event;
1854
1855         event.info = info;
1856         if (state) {
1857                 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1858                 info->state = FBINFO_STATE_SUSPENDED;
1859         } else {
1860                 info->state = FBINFO_STATE_RUNNING;
1861                 fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1862         }
1863 }
1864 EXPORT_SYMBOL(fb_set_suspend);
1865
1866 /**
1867  *      fbmem_init - init frame buffer subsystem
1868  *
1869  *      Initialize the frame buffer subsystem.
1870  *
1871  *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1872  *
1873  */
1874
1875 static int __init
1876 fbmem_init(void)
1877 {
1878         int ret;
1879
1880         if (!proc_create("fb", 0, NULL, &fb_proc_fops))
1881                 return -ENOMEM;
1882
1883         ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
1884         if (ret) {
1885                 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1886                 goto err_chrdev;
1887         }
1888
1889         fb_class = class_create(THIS_MODULE, "graphics");
1890         if (IS_ERR(fb_class)) {
1891                 ret = PTR_ERR(fb_class);
1892                 pr_warn("Unable to create fb class; errno = %d\n", ret);
1893                 fb_class = NULL;
1894                 goto err_class;
1895         }
1896
1897         fb_console_init();
1898
1899         return 0;
1900
1901 err_class:
1902         unregister_chrdev(FB_MAJOR, "fb");
1903 err_chrdev:
1904         remove_proc_entry("fb", NULL);
1905         return ret;
1906 }
1907
1908 #ifdef MODULE
1909 module_init(fbmem_init);
1910 static void __exit
1911 fbmem_exit(void)
1912 {
1913         fb_console_exit();
1914
1915         remove_proc_entry("fb", NULL);
1916         class_destroy(fb_class);
1917         unregister_chrdev(FB_MAJOR, "fb");
1918 }
1919
1920 module_exit(fbmem_exit);
1921 MODULE_LICENSE("GPL");
1922 MODULE_DESCRIPTION("Framebuffer base");
1923 #else
1924 subsys_initcall(fbmem_init);
1925 #endif
1926
1927 int fb_new_modelist(struct fb_info *info)
1928 {
1929         struct fb_event event;
1930         struct fb_var_screeninfo var = info->var;
1931         struct list_head *pos, *n;
1932         struct fb_modelist *modelist;
1933         struct fb_videomode *m, mode;
1934         int err = 1;
1935
1936         list_for_each_safe(pos, n, &info->modelist) {
1937                 modelist = list_entry(pos, struct fb_modelist, list);
1938                 m = &modelist->mode;
1939                 fb_videomode_to_var(&var, m);
1940                 var.activate = FB_ACTIVATE_TEST;
1941                 err = fb_set_var(info, &var);
1942                 fb_var_to_videomode(&mode, &var);
1943                 if (err || !fb_mode_is_equal(m, &mode)) {
1944                         list_del(pos);
1945                         kfree(pos);
1946                 }
1947         }
1948
1949         err = 1;
1950
1951         if (!list_empty(&info->modelist)) {
1952                 event.info = info;
1953                 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1954         }
1955
1956         return err;
1957 }
1958
1959 MODULE_LICENSE("GPL");