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Merge tag 'trace-v5.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...
[linux/fpc-iii.git] / drivers / video / fbdev / core / fbmem.c
blob06f5805de2dee1d25258beed9e952f2bb4d2404a
1 /*
2 * linux/drivers/video/fbmem.c
3 *
4 * Copyright (C) 1994 Martin Schaller
5 *
6 * 2001 - Documented with DocBook
7 * - Brad Douglas <brad@neruo.com>
8 *
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License. See the file COPYING in the main directory of this archive
11 * for more details.
12 */
13
14 #include <linux/module.h>
15
16 #include <linux/compat.h>
17 #include <linux/types.h>
18 #include <linux/errno.h>
19 #include <linux/kernel.h>
20 #include <linux/major.h>
21 #include <linux/slab.h>
22 #include <linux/mm.h>
23 #include <linux/mman.h>
24 #include <linux/vt.h>
25 #include <linux/init.h>
26 #include <linux/linux_logo.h>
27 #include <linux/proc_fs.h>
28 #include <linux/seq_file.h>
29 #include <linux/console.h>
30 #include <linux/kmod.h>
31 #include <linux/err.h>
32 #include <linux/device.h>
33 #include <linux/efi.h>
34 #include <linux/fb.h>
35 #include <linux/fbcon.h>
36 #include <linux/mem_encrypt.h>
37 #include <linux/pci.h>
38
39 #include <asm/fb.h>
40
41
42 /*
43 * Frame buffer device initialization and setup routines
44 */
45
46 #define FBPIXMAPSIZE (1024 * 8)
47
48 static DEFINE_MUTEX(registration_lock);
49
50 struct fb_info *registered_fb[FB_MAX] __read_mostly;
51 EXPORT_SYMBOL(registered_fb);
52
53 int num_registered_fb __read_mostly;
54 EXPORT_SYMBOL(num_registered_fb);
55
56 bool fb_center_logo __read_mostly;
57
58 int fb_logo_count __read_mostly = -1;
59
60 static struct fb_info *get_fb_info(unsigned int idx)
61 {
62 struct fb_info *fb_info;
63
64 if (idx >= FB_MAX)
65 return ERR_PTR(-ENODEV);
66
67 mutex_lock(&registration_lock);
68 fb_info = registered_fb[idx];
69 if (fb_info)
70 atomic_inc(&fb_info->count);
71 mutex_unlock(&registration_lock);
72
73 return fb_info;
74 }
75
76 static void put_fb_info(struct fb_info *fb_info)
77 {
78 if (!atomic_dec_and_test(&fb_info->count))
79 return;
80 if (fb_info->fbops->fb_destroy)
81 fb_info->fbops->fb_destroy(fb_info);
82 }
83
84 /*
85 * Helpers
86 */
87
88 int fb_get_color_depth(struct fb_var_screeninfo *var,
89 struct fb_fix_screeninfo *fix)
90 {
91 int depth = 0;
92
93 if (fix->visual == FB_VISUAL_MONO01 ||
94 fix->visual == FB_VISUAL_MONO10)
95 depth = 1;
96 else {
97 if (var->green.length == var->blue.length &&
98 var->green.length == var->red.length &&
99 var->green.offset == var->blue.offset &&
100 var->green.offset == var->red.offset)
101 depth = var->green.length;
102 else
103 depth = var->green.length + var->red.length +
104 var->blue.length;
105 }
106
107 return depth;
108 }
109 EXPORT_SYMBOL(fb_get_color_depth);
110
111 /*
112 * Data padding functions.
113 */
114 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
115 {
116 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
117 }
118 EXPORT_SYMBOL(fb_pad_aligned_buffer);
119
120 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
121 u32 shift_high, u32 shift_low, u32 mod)
122 {
123 u8 mask = (u8) (0xfff << shift_high), tmp;
124 int i, j;
125
126 for (i = height; i--; ) {
127 for (j = 0; j < idx; j++) {
128 tmp = dst[j];
129 tmp &= mask;
130 tmp |= *src >> shift_low;
131 dst[j] = tmp;
132 tmp = *src << shift_high;
133 dst[j+1] = tmp;
134 src++;
135 }
136 tmp = dst[idx];
137 tmp &= mask;
138 tmp |= *src >> shift_low;
139 dst[idx] = tmp;
140 if (shift_high < mod) {
141 tmp = *src << shift_high;
142 dst[idx+1] = tmp;
143 }
144 src++;
145 dst += d_pitch;
146 }
147 }
148 EXPORT_SYMBOL(fb_pad_unaligned_buffer);
149
150 /*
151 * we need to lock this section since fb_cursor
152 * may use fb_imageblit()
153 */
154 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
155 {
156 u32 align = buf->buf_align - 1, offset;
157 char *addr = buf->addr;
158
159 /* If IO mapped, we need to sync before access, no sharing of
160 * the pixmap is done
161 */
162 if (buf->flags & FB_PIXMAP_IO) {
163 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
164 info->fbops->fb_sync(info);
165 return addr;
166 }
167
168 /* See if we fit in the remaining pixmap space */
169 offset = buf->offset + align;
170 offset &= ~align;
171 if (offset + size > buf->size) {
172 /* We do not fit. In order to be able to re-use the buffer,
173 * we must ensure no asynchronous DMA'ing or whatever operation
174 * is in progress, we sync for that.
175 */
176 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
177 info->fbops->fb_sync(info);
178 offset = 0;
179 }
180 buf->offset = offset + size;
181 addr += offset;
182
183 return addr;
184 }
185 EXPORT_SYMBOL(fb_get_buffer_offset);
186
187 #ifdef CONFIG_LOGO
188
189 static inline unsigned safe_shift(unsigned d, int n)
190 {
191 return n < 0 ? d >> -n : d << n;
192 }
193
194 static void fb_set_logocmap(struct fb_info *info,
195 const struct linux_logo *logo)
196 {
197 struct fb_cmap palette_cmap;
198 u16 palette_green[16];
199 u16 palette_blue[16];
200 u16 palette_red[16];
201 int i, j, n;
202 const unsigned char *clut = logo->clut;
203
204 palette_cmap.start = 0;
205 palette_cmap.len = 16;
206 palette_cmap.red = palette_red;
207 palette_cmap.green = palette_green;
208 palette_cmap.blue = palette_blue;
209 palette_cmap.transp = NULL;
210
211 for (i = 0; i < logo->clutsize; i += n) {
212 n = logo->clutsize - i;
213 /* palette_cmap provides space for only 16 colors at once */
214 if (n > 16)
215 n = 16;
216 palette_cmap.start = 32 + i;
217 palette_cmap.len = n;
218 for (j = 0; j < n; ++j) {
219 palette_cmap.red[j] = clut[0] << 8 | clut[0];
220 palette_cmap.green[j] = clut[1] << 8 | clut[1];
221 palette_cmap.blue[j] = clut[2] << 8 | clut[2];
222 clut += 3;
223 }
224 fb_set_cmap(&palette_cmap, info);
225 }
226 }
227
228 static void fb_set_logo_truepalette(struct fb_info *info,
229 const struct linux_logo *logo,
230 u32 *palette)
231 {
232 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
233 unsigned char redmask, greenmask, bluemask;
234 int redshift, greenshift, blueshift;
235 int i;
236 const unsigned char *clut = logo->clut;
237
238 /*
239 * We have to create a temporary palette since console palette is only
240 * 16 colors long.
241 */
242 /* Bug: Doesn't obey msb_right ... (who needs that?) */
243 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8];
244 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
245 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8];
246 redshift = info->var.red.offset - (8 - info->var.red.length);
247 greenshift = info->var.green.offset - (8 - info->var.green.length);
248 blueshift = info->var.blue.offset - (8 - info->var.blue.length);
249
250 for ( i = 0; i < logo->clutsize; i++) {
251 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
252 safe_shift((clut[1] & greenmask), greenshift) |
253 safe_shift((clut[2] & bluemask), blueshift));
254 clut += 3;
255 }
256 }
257
258 static void fb_set_logo_directpalette(struct fb_info *info,
259 const struct linux_logo *logo,
260 u32 *palette)
261 {
262 int redshift, greenshift, blueshift;
263 int i;
264
265 redshift = info->var.red.offset;
266 greenshift = info->var.green.offset;
267 blueshift = info->var.blue.offset;
268
269 for (i = 32; i < 32 + logo->clutsize; i++)
270 palette[i] = i << redshift | i << greenshift | i << blueshift;
271 }
272
273 static void fb_set_logo(struct fb_info *info,
274 const struct linux_logo *logo, u8 *dst,
275 int depth)
276 {
277 int i, j, k;
278 const u8 *src = logo->data;
279 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
280 u8 fg = 1, d;
281
282 switch (fb_get_color_depth(&info->var, &info->fix)) {
283 case 1:
284 fg = 1;
285 break;
286 case 2:
287 fg = 3;
288 break;
289 default:
290 fg = 7;
291 break;
292 }
293
294 if (info->fix.visual == FB_VISUAL_MONO01 ||
295 info->fix.visual == FB_VISUAL_MONO10)
296 fg = ~((u8) (0xfff << info->var.green.length));
297
298 switch (depth) {
299 case 4:
300 for (i = 0; i < logo->height; i++)
301 for (j = 0; j < logo->width; src++) {
302 *dst++ = *src >> 4;
303 j++;
304 if (j < logo->width) {
305 *dst++ = *src & 0x0f;
306 j++;
307 }
308 }
309 break;
310 case 1:
311 for (i = 0; i < logo->height; i++) {
312 for (j = 0; j < logo->width; src++) {
313 d = *src ^ xor;
314 for (k = 7; k >= 0 && j < logo->width; k--) {
315 *dst++ = ((d >> k) & 1) ? fg : 0;
316 j++;
317 }
318 }
319 }
320 break;
321 }
322 }
323
324 /*
325 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors),
326 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on
327 * the visual format and color depth of the framebuffer, the DAC, the
328 * pseudo_palette, and the logo data will be adjusted accordingly.
329 *
330 * Case 1 - linux_logo_clut224:
331 * Color exceeds the number of console colors (16), thus we set the hardware DAC
332 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set.
333 *
334 * For visuals that require color info from the pseudo_palette, we also construct
335 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
336 * will be set.
337 *
338 * Case 2 - linux_logo_vga16:
339 * The number of colors just matches the console colors, thus there is no need
340 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie,
341 * each byte contains color information for two pixels (upper and lower nibble).
342 * To be consistent with fb_imageblit() usage, we therefore separate the two
343 * nibbles into separate bytes. The "depth" flag will be set to 4.
344 *
345 * Case 3 - linux_logo_mono:
346 * This is similar with Case 2. Each byte contains information for 8 pixels.
347 * We isolate each bit and expand each into a byte. The "depth" flag will
348 * be set to 1.
349 */
350 static struct logo_data {
351 int depth;
352 int needs_directpalette;
353 int needs_truepalette;
354 int needs_cmapreset;
355 const struct linux_logo *logo;
356 } fb_logo __read_mostly;
357
358 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
359 {
360 u32 size = width * height, i;
361
362 out += size - 1;
363
364 for (i = size; i--; )
365 *out-- = *in++;
366 }
367
368 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
369 {
370 int i, j, h = height - 1;
371
372 for (i = 0; i < height; i++)
373 for (j = 0; j < width; j++)
374 out[height * j + h - i] = *in++;
375 }
376
377 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
378 {
379 int i, j, w = width - 1;
380
381 for (i = 0; i < height; i++)
382 for (j = 0; j < width; j++)
383 out[height * (w - j) + i] = *in++;
384 }
385
386 static void fb_rotate_logo(struct fb_info *info, u8 *dst,
387 struct fb_image *image, int rotate)
388 {
389 u32 tmp;
390
391 if (rotate == FB_ROTATE_UD) {
392 fb_rotate_logo_ud(image->data, dst, image->width,
393 image->height);
394 image->dx = info->var.xres - image->width - image->dx;
395 image->dy = info->var.yres - image->height - image->dy;
396 } else if (rotate == FB_ROTATE_CW) {
397 fb_rotate_logo_cw(image->data, dst, image->width,
398 image->height);
399 tmp = image->width;
400 image->width = image->height;
401 image->height = tmp;
402 tmp = image->dy;
403 image->dy = image->dx;
404 image->dx = info->var.xres - image->width - tmp;
405 } else if (rotate == FB_ROTATE_CCW) {
406 fb_rotate_logo_ccw(image->data, dst, image->width,
407 image->height);
408 tmp = image->width;
409 image->width = image->height;
410 image->height = tmp;
411 tmp = image->dx;
412 image->dx = image->dy;
413 image->dy = info->var.yres - image->height - tmp;
414 }
415
416 image->data = dst;
417 }
418
419 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
420 int rotate, unsigned int num)
421 {
422 unsigned int x;
423
424 if (image->width > info->var.xres || image->height > info->var.yres)
425 return;
426
427 if (rotate == FB_ROTATE_UR) {
428 for (x = 0;
429 x < num && image->dx + image->width <= info->var.xres;
430 x++) {
431 info->fbops->fb_imageblit(info, image);
432 image->dx += image->width + 8;
433 }
434 } else if (rotate == FB_ROTATE_UD) {
435 u32 dx = image->dx;
436
437 for (x = 0; x < num && image->dx <= dx; x++) {
438 info->fbops->fb_imageblit(info, image);
439 image->dx -= image->width + 8;
440 }
441 } else if (rotate == FB_ROTATE_CW) {
442 for (x = 0;
443 x < num && image->dy + image->height <= info->var.yres;
444 x++) {
445 info->fbops->fb_imageblit(info, image);
446 image->dy += image->height + 8;
447 }
448 } else if (rotate == FB_ROTATE_CCW) {
449 u32 dy = image->dy;
450
451 for (x = 0; x < num && image->dy <= dy; x++) {
452 info->fbops->fb_imageblit(info, image);
453 image->dy -= image->height + 8;
454 }
455 }
456 }
457
458 static int fb_show_logo_line(struct fb_info *info, int rotate,
459 const struct linux_logo *logo, int y,
460 unsigned int n)
461 {
462 u32 *palette = NULL, *saved_pseudo_palette = NULL;
463 unsigned char *logo_new = NULL, *logo_rotate = NULL;
464 struct fb_image image;
465
466 /* Return if the frame buffer is not mapped or suspended */
467 if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
468 info->fbops->owner)
469 return 0;
470
471 image.depth = 8;
472 image.data = logo->data;
473
474 if (fb_logo.needs_cmapreset)
475 fb_set_logocmap(info, logo);
476
477 if (fb_logo.needs_truepalette ||
478 fb_logo.needs_directpalette) {
479 palette = kmalloc(256 * 4, GFP_KERNEL);
480 if (palette == NULL)
481 return 0;
482
483 if (fb_logo.needs_truepalette)
484 fb_set_logo_truepalette(info, logo, palette);
485 else
486 fb_set_logo_directpalette(info, logo, palette);
487
488 saved_pseudo_palette = info->pseudo_palette;
489 info->pseudo_palette = palette;
490 }
491
492 if (fb_logo.depth <= 4) {
493 logo_new = kmalloc_array(logo->width, logo->height,
494 GFP_KERNEL);
495 if (logo_new == NULL) {
496 kfree(palette);
497 if (saved_pseudo_palette)
498 info->pseudo_palette = saved_pseudo_palette;
499 return 0;
500 }
501 image.data = logo_new;
502 fb_set_logo(info, logo, logo_new, fb_logo.depth);
503 }
504
505 if (fb_center_logo) {
506 int xres = info->var.xres;
507 int yres = info->var.yres;
508
509 if (rotate == FB_ROTATE_CW || rotate == FB_ROTATE_CCW) {
510 xres = info->var.yres;
511 yres = info->var.xres;
512 }
513
514 while (n && (n * (logo->width + 8) - 8 > xres))
515 --n;
516 image.dx = (xres - n * (logo->width + 8) - 8) / 2;
517 image.dy = y ?: (yres - logo->height) / 2;
518 } else {
519 image.dx = 0;
520 image.dy = y;
521 }
522
523 image.width = logo->width;
524 image.height = logo->height;
525
526 if (rotate) {
527 logo_rotate = kmalloc_array(logo->width, logo->height,
528 GFP_KERNEL);
529 if (logo_rotate)
530 fb_rotate_logo(info, logo_rotate, &image, rotate);
531 }
532
533 fb_do_show_logo(info, &image, rotate, n);
534
535 kfree(palette);
536 if (saved_pseudo_palette != NULL)
537 info->pseudo_palette = saved_pseudo_palette;
538 kfree(logo_new);
539 kfree(logo_rotate);
540 return image.dy + logo->height;
541 }
542
543
544 #ifdef CONFIG_FB_LOGO_EXTRA
545
546 #define FB_LOGO_EX_NUM_MAX 10
547 static struct logo_data_extra {
548 const struct linux_logo *logo;
549 unsigned int n;
550 } fb_logo_ex[FB_LOGO_EX_NUM_MAX];
551 static unsigned int fb_logo_ex_num;
552
553 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
554 {
555 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
556 return;
557
558 fb_logo_ex[fb_logo_ex_num].logo = logo;
559 fb_logo_ex[fb_logo_ex_num].n = n;
560 fb_logo_ex_num++;
561 }
562
563 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
564 unsigned int yres)
565 {
566 unsigned int i;
567
568 /* FIXME: logo_ex supports only truecolor fb. */
569 if (info->fix.visual != FB_VISUAL_TRUECOLOR)
570 fb_logo_ex_num = 0;
571
572 for (i = 0; i < fb_logo_ex_num; i++) {
573 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
574 fb_logo_ex[i].logo = NULL;
575 continue;
576 }
577 height += fb_logo_ex[i].logo->height;
578 if (height > yres) {
579 height -= fb_logo_ex[i].logo->height;
580 fb_logo_ex_num = i;
581 break;
582 }
583 }
584 return height;
585 }
586
587 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
588 {
589 unsigned int i;
590
591 for (i = 0; i < fb_logo_ex_num; i++)
592 y = fb_show_logo_line(info, rotate,
593 fb_logo_ex[i].logo, y, fb_logo_ex[i].n);
594
595 return y;
596 }
597
598 #else /* !CONFIG_FB_LOGO_EXTRA */
599
600 static inline int fb_prepare_extra_logos(struct fb_info *info,
601 unsigned int height,
602 unsigned int yres)
603 {
604 return height;
605 }
606
607 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
608 {
609 return y;
610 }
611
612 #endif /* CONFIG_FB_LOGO_EXTRA */
613
614
615 int fb_prepare_logo(struct fb_info *info, int rotate)
616 {
617 int depth = fb_get_color_depth(&info->var, &info->fix);
618 unsigned int yres;
619 int height;
620
621 memset(&fb_logo, 0, sizeof(struct logo_data));
622
623 if (info->flags & FBINFO_MISC_TILEBLITTING ||
624 info->fbops->owner || !fb_logo_count)
625 return 0;
626
627 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
628 depth = info->var.blue.length;
629 if (info->var.red.length < depth)
630 depth = info->var.red.length;
631 if (info->var.green.length < depth)
632 depth = info->var.green.length;
633 }
634
635 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
636 /* assume console colormap */
637 depth = 4;
638 }
639
640 /* Return if no suitable logo was found */
641 fb_logo.logo = fb_find_logo(depth);
642
643 if (!fb_logo.logo) {
644 return 0;
645 }
646
647 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
648 yres = info->var.yres;
649 else
650 yres = info->var.xres;
651
652 if (fb_logo.logo->height > yres) {
653 fb_logo.logo = NULL;
654 return 0;
655 }
656
657 /* What depth we asked for might be different from what we get */
658 if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
659 fb_logo.depth = 8;
660 else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
661 fb_logo.depth = 4;
662 else
663 fb_logo.depth = 1;
664
665
666 if (fb_logo.depth > 4 && depth > 4) {
667 switch (info->fix.visual) {
668 case FB_VISUAL_TRUECOLOR:
669 fb_logo.needs_truepalette = 1;
670 break;
671 case FB_VISUAL_DIRECTCOLOR:
672 fb_logo.needs_directpalette = 1;
673 fb_logo.needs_cmapreset = 1;
674 break;
675 case FB_VISUAL_PSEUDOCOLOR:
676 fb_logo.needs_cmapreset = 1;
677 break;
678 }
679 }
680
681 height = fb_logo.logo->height;
682 if (fb_center_logo)
683 height += (yres - fb_logo.logo->height) / 2;
684
685 return fb_prepare_extra_logos(info, height, yres);
686 }
687
688 int fb_show_logo(struct fb_info *info, int rotate)
689 {
690 unsigned int count;
691 int y;
692
693 if (!fb_logo_count)
694 return 0;
695
696 count = fb_logo_count < 0 ? num_online_cpus() : fb_logo_count;
697 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0, count);
698 y = fb_show_extra_logos(info, y, rotate);
699
700 return y;
701 }
702 #else
703 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
704 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
705 #endif /* CONFIG_LOGO */
706 EXPORT_SYMBOL(fb_prepare_logo);
707 EXPORT_SYMBOL(fb_show_logo);
708
709 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
710 {
711 mutex_lock(&registration_lock);
712 return (*pos < FB_MAX) ? pos : NULL;
713 }
714
715 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
716 {
717 (*pos)++;
718 return (*pos < FB_MAX) ? pos : NULL;
719 }
720
721 static void fb_seq_stop(struct seq_file *m, void *v)
722 {
723 mutex_unlock(&registration_lock);
724 }
725
726 static int fb_seq_show(struct seq_file *m, void *v)
727 {
728 int i = *(loff_t *)v;
729 struct fb_info *fi = registered_fb[i];
730
731 if (fi)
732 seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
733 return 0;
734 }
735
736 static const struct seq_operations proc_fb_seq_ops = {
737 .start = fb_seq_start,
738 .next = fb_seq_next,
739 .stop = fb_seq_stop,
740 .show = fb_seq_show,
741 };
742
743 /*
744 * We hold a reference to the fb_info in file->private_data,
745 * but if the current registered fb has changed, we don't
746 * actually want to use it.
747 *
748 * So look up the fb_info using the inode minor number,
749 * and just verify it against the reference we have.
750 */
751 static struct fb_info *file_fb_info(struct file *file)
752 {
753 struct inode *inode = file_inode(file);
754 int fbidx = iminor(inode);
755 struct fb_info *info = registered_fb[fbidx];
756
757 if (info != file->private_data)
758 info = NULL;
759 return info;
760 }
761
762 static ssize_t
763 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
764 {
765 unsigned long p = *ppos;
766 struct fb_info *info = file_fb_info(file);
767 u8 *buffer, *dst;
768 u8 __iomem *src;
769 int c, cnt = 0, err = 0;
770 unsigned long total_size;
771
772 if (!info || ! info->screen_base)
773 return -ENODEV;
774
775 if (info->state != FBINFO_STATE_RUNNING)
776 return -EPERM;
777
778 if (info->fbops->fb_read)
779 return info->fbops->fb_read(info, buf, count, ppos);
780
781 total_size = info->screen_size;
782
783 if (total_size == 0)
784 total_size = info->fix.smem_len;
785
786 if (p >= total_size)
787 return 0;
788
789 if (count >= total_size)
790 count = total_size;
791
792 if (count + p > total_size)
793 count = total_size - p;
794
795 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
796 GFP_KERNEL);
797 if (!buffer)
798 return -ENOMEM;
799
800 src = (u8 __iomem *) (info->screen_base + p);
801
802 if (info->fbops->fb_sync)
803 info->fbops->fb_sync(info);
804
805 while (count) {
806 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
807 dst = buffer;
808 fb_memcpy_fromfb(dst, src, c);
809 dst += c;
810 src += c;
811
812 if (copy_to_user(buf, buffer, c)) {
813 err = -EFAULT;
814 break;
815 }
816 *ppos += c;
817 buf += c;
818 cnt += c;
819 count -= c;
820 }
821
822 kfree(buffer);
823
824 return (err) ? err : cnt;
825 }
826
827 static ssize_t
828 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
829 {
830 unsigned long p = *ppos;
831 struct fb_info *info = file_fb_info(file);
832 u8 *buffer, *src;
833 u8 __iomem *dst;
834 int c, cnt = 0, err = 0;
835 unsigned long total_size;
836
837 if (!info || !info->screen_base)
838 return -ENODEV;
839
840 if (info->state != FBINFO_STATE_RUNNING)
841 return -EPERM;
842
843 if (info->fbops->fb_write)
844 return info->fbops->fb_write(info, buf, count, ppos);
845
846 total_size = info->screen_size;
847
848 if (total_size == 0)
849 total_size = info->fix.smem_len;
850
851 if (p > total_size)
852 return -EFBIG;
853
854 if (count > total_size) {
855 err = -EFBIG;
856 count = total_size;
857 }
858
859 if (count + p > total_size) {
860 if (!err)
861 err = -ENOSPC;
862
863 count = total_size - p;
864 }
865
866 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
867 GFP_KERNEL);
868 if (!buffer)
869 return -ENOMEM;
870
871 dst = (u8 __iomem *) (info->screen_base + p);
872
873 if (info->fbops->fb_sync)
874 info->fbops->fb_sync(info);
875
876 while (count) {
877 c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
878 src = buffer;
879
880 if (copy_from_user(src, buf, c)) {
881 err = -EFAULT;
882 break;
883 }
884
885 fb_memcpy_tofb(dst, src, c);
886 dst += c;
887 src += c;
888 *ppos += c;
889 buf += c;
890 cnt += c;
891 count -= c;
892 }
893
894 kfree(buffer);
895
896 return (cnt) ? cnt : err;
897 }
898
899 int
900 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
901 {
902 struct fb_fix_screeninfo *fix = &info->fix;
903 unsigned int yres = info->var.yres;
904 int err = 0;
905
906 if (var->yoffset > 0) {
907 if (var->vmode & FB_VMODE_YWRAP) {
908 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
909 err = -EINVAL;
910 else
911 yres = 0;
912 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
913 err = -EINVAL;
914 }
915
916 if (var->xoffset > 0 && (!fix->xpanstep ||
917 (var->xoffset % fix->xpanstep)))
918 err = -EINVAL;
919
920 if (err || !info->fbops->fb_pan_display ||
921 var->yoffset > info->var.yres_virtual - yres ||
922 var->xoffset > info->var.xres_virtual - info->var.xres)
923 return -EINVAL;
924
925 if ((err = info->fbops->fb_pan_display(var, info)))
926 return err;
927 info->var.xoffset = var->xoffset;
928 info->var.yoffset = var->yoffset;
929 if (var->vmode & FB_VMODE_YWRAP)
930 info->var.vmode |= FB_VMODE_YWRAP;
931 else
932 info->var.vmode &= ~FB_VMODE_YWRAP;
933 return 0;
934 }
935 EXPORT_SYMBOL(fb_pan_display);
936
937 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
938 u32 activate)
939 {
940 struct fb_blit_caps caps, fbcaps;
941 int err = 0;
942
943 memset(&caps, 0, sizeof(caps));
944 memset(&fbcaps, 0, sizeof(fbcaps));
945 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
946 fbcon_get_requirement(info, &caps);
947 info->fbops->fb_get_caps(info, &fbcaps, var);
948
949 if (((fbcaps.x ^ caps.x) & caps.x) ||
950 ((fbcaps.y ^ caps.y) & caps.y) ||
951 (fbcaps.len < caps.len))
952 err = -EINVAL;
953
954 return err;
955 }
956
957 int
958 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
959 {
960 int ret = 0;
961 u32 activate;
962 struct fb_var_screeninfo old_var;
963 struct fb_videomode mode;
964 struct fb_event event;
965
966 if (var->activate & FB_ACTIVATE_INV_MODE) {
967 struct fb_videomode mode1, mode2;
968
969 fb_var_to_videomode(&mode1, var);
970 fb_var_to_videomode(&mode2, &info->var);
971 /* make sure we don't delete the videomode of current var */
972 ret = fb_mode_is_equal(&mode1, &mode2);
973
974 if (!ret)
975 fbcon_mode_deleted(info, &mode1);
976
977 if (!ret)
978 fb_delete_videomode(&mode1, &info->modelist);
979
980
981 return ret ? -EINVAL : 0;
982 }
983
984 if (!(var->activate & FB_ACTIVATE_FORCE) &&
985 !memcmp(&info->var, var, sizeof(struct fb_var_screeninfo)))
986 return 0;
987
988 activate = var->activate;
989
990 /* When using FOURCC mode, make sure the red, green, blue and
991 * transp fields are set to 0.
992 */
993 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
994 var->grayscale > 1) {
995 if (var->red.offset || var->green.offset ||
996 var->blue.offset || var->transp.offset ||
997 var->red.length || var->green.length ||
998 var->blue.length || var->transp.length ||
999 var->red.msb_right || var->green.msb_right ||
1000 var->blue.msb_right || var->transp.msb_right)
1001 return -EINVAL;
1002 }
1003
1004 if (!info->fbops->fb_check_var) {
1005 *var = info->var;
1006 return 0;
1007 }
1008
1009 /* bitfill_aligned() assumes that it's at least 8x8 */
1010 if (var->xres < 8 || var->yres < 8)
1011 return -EINVAL;
1012
1013 ret = info->fbops->fb_check_var(var, info);
1014
1015 if (ret)
1016 return ret;
1017
1018 if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW)
1019 return 0;
1020
1021 if (info->fbops->fb_get_caps) {
1022 ret = fb_check_caps(info, var, activate);
1023
1024 if (ret)
1025 return ret;
1026 }
1027
1028 old_var = info->var;
1029 info->var = *var;
1030
1031 if (info->fbops->fb_set_par) {
1032 ret = info->fbops->fb_set_par(info);
1033
1034 if (ret) {
1035 info->var = old_var;
1036 printk(KERN_WARNING "detected "
1037 "fb_set_par error, "
1038 "error code: %d\n", ret);
1039 return ret;
1040 }
1041 }
1042
1043 fb_pan_display(info, &info->var);
1044 fb_set_cmap(&info->cmap, info);
1045 fb_var_to_videomode(&mode, &info->var);
1046
1047 if (info->modelist.prev && info->modelist.next &&
1048 !list_empty(&info->modelist))
1049 ret = fb_add_videomode(&mode, &info->modelist);
1050
1051 if (ret)
1052 return ret;
1053
1054 event.info = info;
1055 event.data = &mode;
1056 fb_notifier_call_chain(FB_EVENT_MODE_CHANGE, &event);
1057
1058 return 0;
1059 }
1060 EXPORT_SYMBOL(fb_set_var);
1061
1062 int
1063 fb_blank(struct fb_info *info, int blank)
1064 {
1065 struct fb_event event;
1066 int ret = -EINVAL;
1067
1068 if (blank > FB_BLANK_POWERDOWN)
1069 blank = FB_BLANK_POWERDOWN;
1070
1071 event.info = info;
1072 event.data = &blank;
1073
1074 if (info->fbops->fb_blank)
1075 ret = info->fbops->fb_blank(blank, info);
1076
1077 if (!ret)
1078 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1079
1080 return ret;
1081 }
1082 EXPORT_SYMBOL(fb_blank);
1083
1084 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1085 unsigned long arg)
1086 {
1087 const struct fb_ops *fb;
1088 struct fb_var_screeninfo var;
1089 struct fb_fix_screeninfo fix;
1090 struct fb_cmap cmap_from;
1091 struct fb_cmap_user cmap;
1092 void __user *argp = (void __user *)arg;
1093 long ret = 0;
1094
1095 switch (cmd) {
1096 case FBIOGET_VSCREENINFO:
1097 lock_fb_info(info);
1098 var = info->var;
1099 unlock_fb_info(info);
1100
1101 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1102 break;
1103 case FBIOPUT_VSCREENINFO:
1104 if (copy_from_user(&var, argp, sizeof(var)))
1105 return -EFAULT;
1106 console_lock();
1107 lock_fb_info(info);
1108 ret = fb_set_var(info, &var);
1109 if (!ret)
1110 fbcon_update_vcs(info, var.activate & FB_ACTIVATE_ALL);
1111 unlock_fb_info(info);
1112 console_unlock();
1113 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1114 ret = -EFAULT;
1115 break;
1116 case FBIOGET_FSCREENINFO:
1117 lock_fb_info(info);
1118 memcpy(&fix, &info->fix, sizeof(fix));
1119 if (info->flags & FBINFO_HIDE_SMEM_START)
1120 fix.smem_start = 0;
1121 unlock_fb_info(info);
1122
1123 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1124 break;
1125 case FBIOPUTCMAP:
1126 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1127 return -EFAULT;
1128 ret = fb_set_user_cmap(&cmap, info);
1129 break;
1130 case FBIOGETCMAP:
1131 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1132 return -EFAULT;
1133 lock_fb_info(info);
1134 cmap_from = info->cmap;
1135 unlock_fb_info(info);
1136 ret = fb_cmap_to_user(&cmap_from, &cmap);
1137 break;
1138 case FBIOPAN_DISPLAY:
1139 if (copy_from_user(&var, argp, sizeof(var)))
1140 return -EFAULT;
1141 console_lock();
1142 lock_fb_info(info);
1143 ret = fb_pan_display(info, &var);
1144 unlock_fb_info(info);
1145 console_unlock();
1146 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1147 return -EFAULT;
1148 break;
1149 case FBIO_CURSOR:
1150 ret = -EINVAL;
1151 break;
1152 case FBIOGET_CON2FBMAP:
1153 ret = fbcon_get_con2fb_map_ioctl(argp);
1154 break;
1155 case FBIOPUT_CON2FBMAP:
1156 ret = fbcon_set_con2fb_map_ioctl(argp);
1157 break;
1158 case FBIOBLANK:
1159 console_lock();
1160 lock_fb_info(info);
1161 ret = fb_blank(info, arg);
1162 /* might again call into fb_blank */
1163 fbcon_fb_blanked(info, arg);
1164 unlock_fb_info(info);
1165 console_unlock();
1166 break;
1167 default:
1168 lock_fb_info(info);
1169 fb = info->fbops;
1170 if (fb->fb_ioctl)
1171 ret = fb->fb_ioctl(info, cmd, arg);
1172 else
1173 ret = -ENOTTY;
1174 unlock_fb_info(info);
1175 }
1176 return ret;
1177 }
1178
1179 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1180 {
1181 struct fb_info *info = file_fb_info(file);
1182
1183 if (!info)
1184 return -ENODEV;
1185 return do_fb_ioctl(info, cmd, arg);
1186 }
1187
1188 #ifdef CONFIG_COMPAT
1189 struct fb_fix_screeninfo32 {
1190 char id[16];
1191 compat_caddr_t smem_start;
1192 u32 smem_len;
1193 u32 type;
1194 u32 type_aux;
1195 u32 visual;
1196 u16 xpanstep;
1197 u16 ypanstep;
1198 u16 ywrapstep;
1199 u32 line_length;
1200 compat_caddr_t mmio_start;
1201 u32 mmio_len;
1202 u32 accel;
1203 u16 reserved[3];
1204 };
1205
1206 struct fb_cmap32 {
1207 u32 start;
1208 u32 len;
1209 compat_caddr_t red;
1210 compat_caddr_t green;
1211 compat_caddr_t blue;
1212 compat_caddr_t transp;
1213 };
1214
1215 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1216 unsigned long arg)
1217 {
1218 struct fb_cmap32 cmap32;
1219 struct fb_cmap cmap_from;
1220 struct fb_cmap_user cmap;
1221
1222 if (copy_from_user(&cmap32, compat_ptr(arg), sizeof(cmap32)))
1223 return -EFAULT;
1224
1225 cmap = (struct fb_cmap_user) {
1226 .start = cmap32.start,
1227 .len = cmap32.len,
1228 .red = compat_ptr(cmap32.red),
1229 .green = compat_ptr(cmap32.green),
1230 .blue = compat_ptr(cmap32.blue),
1231 .transp = compat_ptr(cmap32.transp),
1232 };
1233
1234 if (cmd == FBIOPUTCMAP)
1235 return fb_set_user_cmap(&cmap, info);
1236
1237 lock_fb_info(info);
1238 cmap_from = info->cmap;
1239 unlock_fb_info(info);
1240
1241 return fb_cmap_to_user(&cmap_from, &cmap);
1242 }
1243
1244 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1245 struct fb_fix_screeninfo32 __user *fix32)
1246 {
1247 __u32 data;
1248 int err;
1249
1250 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1251
1252 data = (__u32) (unsigned long) fix->smem_start;
1253 err |= put_user(data, &fix32->smem_start);
1254
1255 err |= put_user(fix->smem_len, &fix32->smem_len);
1256 err |= put_user(fix->type, &fix32->type);
1257 err |= put_user(fix->type_aux, &fix32->type_aux);
1258 err |= put_user(fix->visual, &fix32->visual);
1259 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1260 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1261 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1262 err |= put_user(fix->line_length, &fix32->line_length);
1263
1264 data = (__u32) (unsigned long) fix->mmio_start;
1265 err |= put_user(data, &fix32->mmio_start);
1266
1267 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1268 err |= put_user(fix->accel, &fix32->accel);
1269 err |= copy_to_user(fix32->reserved, fix->reserved,
1270 sizeof(fix->reserved));
1271
1272 if (err)
1273 return -EFAULT;
1274 return 0;
1275 }
1276
1277 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1278 unsigned long arg)
1279 {
1280 struct fb_fix_screeninfo fix;
1281
1282 lock_fb_info(info);
1283 fix = info->fix;
1284 if (info->flags & FBINFO_HIDE_SMEM_START)
1285 fix.smem_start = 0;
1286 unlock_fb_info(info);
1287 return do_fscreeninfo_to_user(&fix, compat_ptr(arg));
1288 }
1289
1290 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1291 unsigned long arg)
1292 {
1293 struct fb_info *info = file_fb_info(file);
1294 const struct fb_ops *fb;
1295 long ret = -ENOIOCTLCMD;
1296
1297 if (!info)
1298 return -ENODEV;
1299 fb = info->fbops;
1300 switch(cmd) {
1301 case FBIOGET_VSCREENINFO:
1302 case FBIOPUT_VSCREENINFO:
1303 case FBIOPAN_DISPLAY:
1304 case FBIOGET_CON2FBMAP:
1305 case FBIOPUT_CON2FBMAP:
1306 arg = (unsigned long) compat_ptr(arg);
1307 fallthrough;
1308 case FBIOBLANK:
1309 ret = do_fb_ioctl(info, cmd, arg);
1310 break;
1311
1312 case FBIOGET_FSCREENINFO:
1313 ret = fb_get_fscreeninfo(info, cmd, arg);
1314 break;
1315
1316 case FBIOGETCMAP:
1317 case FBIOPUTCMAP:
1318 ret = fb_getput_cmap(info, cmd, arg);
1319 break;
1320
1321 default:
1322 if (fb->fb_compat_ioctl)
1323 ret = fb->fb_compat_ioctl(info, cmd, arg);
1324 break;
1325 }
1326 return ret;
1327 }
1328 #endif
1329
1330 static int
1331 fb_mmap(struct file *file, struct vm_area_struct * vma)
1332 {
1333 struct fb_info *info = file_fb_info(file);
1334 int (*fb_mmap_fn)(struct fb_info *info, struct vm_area_struct *vma);
1335 unsigned long mmio_pgoff;
1336 unsigned long start;
1337 u32 len;
1338
1339 if (!info)
1340 return -ENODEV;
1341 mutex_lock(&info->mm_lock);
1342
1343 fb_mmap_fn = info->fbops->fb_mmap;
1344
1345 #if IS_ENABLED(CONFIG_FB_DEFERRED_IO)
1346 if (info->fbdefio)
1347 fb_mmap_fn = fb_deferred_io_mmap;
1348 #endif
1349
1350 if (fb_mmap_fn) {
1351 int res;
1352
1353 /*
1354 * The framebuffer needs to be accessed decrypted, be sure
1355 * SME protection is removed ahead of the call
1356 */
1357 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1358 res = fb_mmap_fn(info, vma);
1359 mutex_unlock(&info->mm_lock);
1360 return res;
1361 }
1362
1363 /*
1364 * Ugh. This can be either the frame buffer mapping, or
1365 * if pgoff points past it, the mmio mapping.
1366 */
1367 start = info->fix.smem_start;
1368 len = info->fix.smem_len;
1369 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1370 if (vma->vm_pgoff >= mmio_pgoff) {
1371 if (info->var.accel_flags) {
1372 mutex_unlock(&info->mm_lock);
1373 return -EINVAL;
1374 }
1375
1376 vma->vm_pgoff -= mmio_pgoff;
1377 start = info->fix.mmio_start;
1378 len = info->fix.mmio_len;
1379 }
1380 mutex_unlock(&info->mm_lock);
1381
1382 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1383 fb_pgprotect(file, vma, start);
1384
1385 return vm_iomap_memory(vma, start, len);
1386 }
1387
1388 static int
1389 fb_open(struct inode *inode, struct file *file)
1390 __acquires(&info->lock)
1391 __releases(&info->lock)
1392 {
1393 int fbidx = iminor(inode);
1394 struct fb_info *info;
1395 int res = 0;
1396
1397 info = get_fb_info(fbidx);
1398 if (!info) {
1399 request_module("fb%d", fbidx);
1400 info = get_fb_info(fbidx);
1401 if (!info)
1402 return -ENODEV;
1403 }
1404 if (IS_ERR(info))
1405 return PTR_ERR(info);
1406
1407 lock_fb_info(info);
1408 if (!try_module_get(info->fbops->owner)) {
1409 res = -ENODEV;
1410 goto out;
1411 }
1412 file->private_data = info;
1413 if (info->fbops->fb_open) {
1414 res = info->fbops->fb_open(info,1);
1415 if (res)
1416 module_put(info->fbops->owner);
1417 }
1418 #ifdef CONFIG_FB_DEFERRED_IO
1419 if (info->fbdefio)
1420 fb_deferred_io_open(info, inode, file);
1421 #endif
1422 out:
1423 unlock_fb_info(info);
1424 if (res)
1425 put_fb_info(info);
1426 return res;
1427 }
1428
1429 static int
1430 fb_release(struct inode *inode, struct file *file)
1431 __acquires(&info->lock)
1432 __releases(&info->lock)
1433 {
1434 struct fb_info * const info = file->private_data;
1435
1436 lock_fb_info(info);
1437 if (info->fbops->fb_release)
1438 info->fbops->fb_release(info,1);
1439 module_put(info->fbops->owner);
1440 unlock_fb_info(info);
1441 put_fb_info(info);
1442 return 0;
1443 }
1444
1445 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU)
1446 unsigned long get_fb_unmapped_area(struct file *filp,
1447 unsigned long addr, unsigned long len,
1448 unsigned long pgoff, unsigned long flags)
1449 {
1450 struct fb_info * const info = filp->private_data;
1451 unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
1452
1453 if (pgoff > fb_size || len > fb_size - pgoff)
1454 return -EINVAL;
1455
1456 return (unsigned long)info->screen_base + pgoff;
1457 }
1458 #endif
1459
1460 static const struct file_operations fb_fops = {
1461 .owner = THIS_MODULE,
1462 .read = fb_read,
1463 .write = fb_write,
1464 .unlocked_ioctl = fb_ioctl,
1465 #ifdef CONFIG_COMPAT
1466 .compat_ioctl = fb_compat_ioctl,
1467 #endif
1468 .mmap = fb_mmap,
1469 .open = fb_open,
1470 .release = fb_release,
1471 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \
1472 (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \
1473 !defined(CONFIG_MMU))
1474 .get_unmapped_area = get_fb_unmapped_area,
1475 #endif
1476 #ifdef CONFIG_FB_DEFERRED_IO
1477 .fsync = fb_deferred_io_fsync,
1478 #endif
1479 .llseek = default_llseek,
1480 };
1481
1482 struct class *fb_class;
1483 EXPORT_SYMBOL(fb_class);
1484
1485 static int fb_check_foreignness(struct fb_info *fi)
1486 {
1487 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1488
1489 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1490
1491 #ifdef __BIG_ENDIAN
1492 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1493 #else
1494 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1495 #endif /* __BIG_ENDIAN */
1496
1497 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1498 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1499 "support this framebuffer\n", fi->fix.id);
1500 return -ENOSYS;
1501 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1502 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1503 "support this framebuffer\n", fi->fix.id);
1504 return -ENOSYS;
1505 }
1506
1507 return 0;
1508 }
1509
1510 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1511 {
1512 /* is the generic aperture base the same as the HW one */
1513 if (gen->base == hw->base)
1514 return true;
1515 /* is the generic aperture base inside the hw base->hw base+size */
1516 if (gen->base > hw->base && gen->base < hw->base + hw->size)
1517 return true;
1518 return false;
1519 }
1520
1521 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1522 struct apertures_struct *hwa)
1523 {
1524 int i, j;
1525 if (!hwa || !gena)
1526 return false;
1527
1528 for (i = 0; i < hwa->count; ++i) {
1529 struct aperture *h = &hwa->ranges[i];
1530 for (j = 0; j < gena->count; ++j) {
1531 struct aperture *g = &gena->ranges[j];
1532 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1533 (unsigned long long)g->base,
1534 (unsigned long long)g->size,
1535 (unsigned long long)h->base,
1536 (unsigned long long)h->size);
1537 if (apertures_overlap(g, h))
1538 return true;
1539 }
1540 }
1541
1542 return false;
1543 }
1544
1545 static void do_unregister_framebuffer(struct fb_info *fb_info);
1546
1547 #define VGA_FB_PHYS 0xA0000
1548 static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
1549 const char *name, bool primary)
1550 {
1551 int i;
1552
1553 /* check all firmware fbs and kick off if the base addr overlaps */
1554 for_each_registered_fb(i) {
1555 struct apertures_struct *gen_aper;
1556
1557 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1558 continue;
1559
1560 gen_aper = registered_fb[i]->apertures;
1561 if (fb_do_apertures_overlap(gen_aper, a) ||
1562 (primary && gen_aper && gen_aper->count &&
1563 gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1564
1565 printk(KERN_INFO "fb%d: switching to %s from %s\n",
1566 i, name, registered_fb[i]->fix.id);
1567 do_unregister_framebuffer(registered_fb[i]);
1568 }
1569 }
1570 }
1571
1572 static bool lockless_register_fb;
1573 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
1574 MODULE_PARM_DESC(lockless_register_fb,
1575 "Lockless framebuffer registration for debugging [default=off]");
1576
1577 static int do_register_framebuffer(struct fb_info *fb_info)
1578 {
1579 int i, ret;
1580 struct fb_videomode mode;
1581
1582 if (fb_check_foreignness(fb_info))
1583 return -ENOSYS;
1584
1585 do_remove_conflicting_framebuffers(fb_info->apertures,
1586 fb_info->fix.id,
1587 fb_is_primary_device(fb_info));
1588
1589 if (num_registered_fb == FB_MAX)
1590 return -ENXIO;
1591
1592 num_registered_fb++;
1593 for (i = 0 ; i < FB_MAX; i++)
1594 if (!registered_fb[i])
1595 break;
1596 fb_info->node = i;
1597 atomic_set(&fb_info->count, 1);
1598 mutex_init(&fb_info->lock);
1599 mutex_init(&fb_info->mm_lock);
1600
1601 fb_info->dev = device_create(fb_class, fb_info->device,
1602 MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1603 if (IS_ERR(fb_info->dev)) {
1604 /* Not fatal */
1605 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1606 fb_info->dev = NULL;
1607 } else
1608 fb_init_device(fb_info);
1609
1610 if (fb_info->pixmap.addr == NULL) {
1611 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1612 if (fb_info->pixmap.addr) {
1613 fb_info->pixmap.size = FBPIXMAPSIZE;
1614 fb_info->pixmap.buf_align = 1;
1615 fb_info->pixmap.scan_align = 1;
1616 fb_info->pixmap.access_align = 32;
1617 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1618 }
1619 }
1620 fb_info->pixmap.offset = 0;
1621
1622 if (!fb_info->pixmap.blit_x)
1623 fb_info->pixmap.blit_x = ~(u32)0;
1624
1625 if (!fb_info->pixmap.blit_y)
1626 fb_info->pixmap.blit_y = ~(u32)0;
1627
1628 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1629 INIT_LIST_HEAD(&fb_info->modelist);
1630
1631 if (fb_info->skip_vt_switch)
1632 pm_vt_switch_required(fb_info->dev, false);
1633 else
1634 pm_vt_switch_required(fb_info->dev, true);
1635
1636 fb_var_to_videomode(&mode, &fb_info->var);
1637 fb_add_videomode(&mode, &fb_info->modelist);
1638 registered_fb[i] = fb_info;
1639
1640 #ifdef CONFIG_GUMSTIX_AM200EPD
1641 {
1642 struct fb_event event;
1643 event.info = fb_info;
1644 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1645 }
1646 #endif
1647
1648 if (!lockless_register_fb)
1649 console_lock();
1650 else
1651 atomic_inc(&ignore_console_lock_warning);
1652 lock_fb_info(fb_info);
1653 ret = fbcon_fb_registered(fb_info);
1654 unlock_fb_info(fb_info);
1655
1656 if (!lockless_register_fb)
1657 console_unlock();
1658 else
1659 atomic_dec(&ignore_console_lock_warning);
1660 return ret;
1661 }
1662
1663 static void unbind_console(struct fb_info *fb_info)
1664 {
1665 int i = fb_info->node;
1666
1667 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1668 return;
1669
1670 console_lock();
1671 lock_fb_info(fb_info);
1672 fbcon_fb_unbind(fb_info);
1673 unlock_fb_info(fb_info);
1674 console_unlock();
1675 }
1676
1677 static void unlink_framebuffer(struct fb_info *fb_info)
1678 {
1679 int i;
1680
1681 i = fb_info->node;
1682 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1683 return;
1684
1685 if (!fb_info->dev)
1686 return;
1687
1688 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1689
1690 pm_vt_switch_unregister(fb_info->dev);
1691
1692 unbind_console(fb_info);
1693
1694 fb_info->dev = NULL;
1695 }
1696
1697 static void do_unregister_framebuffer(struct fb_info *fb_info)
1698 {
1699 unlink_framebuffer(fb_info);
1700 if (fb_info->pixmap.addr &&
1701 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1702 kfree(fb_info->pixmap.addr);
1703 fb_destroy_modelist(&fb_info->modelist);
1704 registered_fb[fb_info->node] = NULL;
1705 num_registered_fb--;
1706 fb_cleanup_device(fb_info);
1707 #ifdef CONFIG_GUMSTIX_AM200EPD
1708 {
1709 struct fb_event event;
1710 event.info = fb_info;
1711 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1712 }
1713 #endif
1714 console_lock();
1715 fbcon_fb_unregistered(fb_info);
1716 console_unlock();
1717
1718 /* this may free fb info */
1719 put_fb_info(fb_info);
1720 }
1721
1722 /**
1723 * remove_conflicting_framebuffers - remove firmware-configured framebuffers
1724 * @a: memory range, users of which are to be removed
1725 * @name: requesting driver name
1726 * @primary: also kick vga16fb if present
1727 *
1728 * This function removes framebuffer devices (initialized by firmware/bootloader)
1729 * which use memory range described by @a. If @a is NULL all such devices are
1730 * removed.
1731 */
1732 int remove_conflicting_framebuffers(struct apertures_struct *a,
1733 const char *name, bool primary)
1734 {
1735 bool do_free = false;
1736
1737 if (!a) {
1738 a = alloc_apertures(1);
1739 if (!a)
1740 return -ENOMEM;
1741
1742 a->ranges[0].base = 0;
1743 a->ranges[0].size = ~0;
1744 do_free = true;
1745 }
1746
1747 mutex_lock(&registration_lock);
1748 do_remove_conflicting_framebuffers(a, name, primary);
1749 mutex_unlock(&registration_lock);
1750
1751 if (do_free)
1752 kfree(a);
1753
1754 return 0;
1755 }
1756 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1757
1758 /**
1759 * remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices
1760 * @pdev: PCI device
1761 * @name: requesting driver name
1762 *
1763 * This function removes framebuffer devices (eg. initialized by firmware)
1764 * using memory range configured for any of @pdev's memory bars.
1765 *
1766 * The function assumes that PCI device with shadowed ROM drives a primary
1767 * display and so kicks out vga16fb.
1768 */
1769 int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, const char *name)
1770 {
1771 struct apertures_struct *ap;
1772 bool primary = false;
1773 int err, idx, bar;
1774
1775 for (idx = 0, bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
1776 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
1777 continue;
1778 idx++;
1779 }
1780
1781 ap = alloc_apertures(idx);
1782 if (!ap)
1783 return -ENOMEM;
1784
1785 for (idx = 0, bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
1786 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
1787 continue;
1788 ap->ranges[idx].base = pci_resource_start(pdev, bar);
1789 ap->ranges[idx].size = pci_resource_len(pdev, bar);
1790 pci_dbg(pdev, "%s: bar %d: 0x%lx -> 0x%lx\n", __func__, bar,
1791 (unsigned long)pci_resource_start(pdev, bar),
1792 (unsigned long)pci_resource_end(pdev, bar));
1793 idx++;
1794 }
1795
1796 #ifdef CONFIG_X86
1797 primary = pdev->resource[PCI_ROM_RESOURCE].flags &
1798 IORESOURCE_ROM_SHADOW;
1799 #endif
1800 err = remove_conflicting_framebuffers(ap, name, primary);
1801 kfree(ap);
1802 return err;
1803 }
1804 EXPORT_SYMBOL(remove_conflicting_pci_framebuffers);
1805
1806 /**
1807 * register_framebuffer - registers a frame buffer device
1808 * @fb_info: frame buffer info structure
1809 *
1810 * Registers a frame buffer device @fb_info.
1811 *
1812 * Returns negative errno on error, or zero for success.
1813 *
1814 */
1815 int
1816 register_framebuffer(struct fb_info *fb_info)
1817 {
1818 int ret;
1819
1820 mutex_lock(&registration_lock);
1821 ret = do_register_framebuffer(fb_info);
1822 mutex_unlock(&registration_lock);
1823
1824 return ret;
1825 }
1826 EXPORT_SYMBOL(register_framebuffer);
1827
1828 /**
1829 * unregister_framebuffer - releases a frame buffer device
1830 * @fb_info: frame buffer info structure
1831 *
1832 * Unregisters a frame buffer device @fb_info.
1833 *
1834 * Returns negative errno on error, or zero for success.
1835 *
1836 * This function will also notify the framebuffer console
1837 * to release the driver.
1838 *
1839 * This is meant to be called within a driver's module_exit()
1840 * function. If this is called outside module_exit(), ensure
1841 * that the driver implements fb_open() and fb_release() to
1842 * check that no processes are using the device.
1843 */
1844 void
1845 unregister_framebuffer(struct fb_info *fb_info)
1846 {
1847 mutex_lock(&registration_lock);
1848 do_unregister_framebuffer(fb_info);
1849 mutex_unlock(&registration_lock);
1850 }
1851 EXPORT_SYMBOL(unregister_framebuffer);
1852
1853 /**
1854 * fb_set_suspend - low level driver signals suspend
1855 * @info: framebuffer affected
1856 * @state: 0 = resuming, !=0 = suspending
1857 *
1858 * This is meant to be used by low level drivers to
1859 * signal suspend/resume to the core & clients.
1860 * It must be called with the console semaphore held
1861 */
1862 void fb_set_suspend(struct fb_info *info, int state)
1863 {
1864 WARN_CONSOLE_UNLOCKED();
1865
1866 if (state) {
1867 fbcon_suspended(info);
1868 info->state = FBINFO_STATE_SUSPENDED;
1869 } else {
1870 info->state = FBINFO_STATE_RUNNING;
1871 fbcon_resumed(info);
1872 }
1873 }
1874 EXPORT_SYMBOL(fb_set_suspend);
1875
1876 /**
1877 * fbmem_init - init frame buffer subsystem
1878 *
1879 * Initialize the frame buffer subsystem.
1880 *
1881 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1882 *
1883 */
1884
1885 static int __init
1886 fbmem_init(void)
1887 {
1888 int ret;
1889
1890 if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops))
1891 return -ENOMEM;
1892
1893 ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
1894 if (ret) {
1895 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1896 goto err_chrdev;
1897 }
1898
1899 fb_class = class_create(THIS_MODULE, "graphics");
1900 if (IS_ERR(fb_class)) {
1901 ret = PTR_ERR(fb_class);
1902 pr_warn("Unable to create fb class; errno = %d\n", ret);
1903 fb_class = NULL;
1904 goto err_class;
1905 }
1906
1907 fb_console_init();
1908
1909 return 0;
1910
1911 err_class:
1912 unregister_chrdev(FB_MAJOR, "fb");
1913 err_chrdev:
1914 remove_proc_entry("fb", NULL);
1915 return ret;
1916 }
1917
1918 #ifdef MODULE
1919 module_init(fbmem_init);
1920 static void __exit
1921 fbmem_exit(void)
1922 {
1923 fb_console_exit();
1924
1925 remove_proc_entry("fb", NULL);
1926 class_destroy(fb_class);
1927 unregister_chrdev(FB_MAJOR, "fb");
1928 }
1929
1930 module_exit(fbmem_exit);
1931 MODULE_LICENSE("GPL");
1932 MODULE_DESCRIPTION("Framebuffer base");
1933 #else
1934 subsys_initcall(fbmem_init);
1935 #endif
1936
1937 int fb_new_modelist(struct fb_info *info)
1938 {
1939 struct fb_var_screeninfo var = info->var;
1940 struct list_head *pos, *n;
1941 struct fb_modelist *modelist;
1942 struct fb_videomode *m, mode;
1943 int err;
1944
1945 list_for_each_safe(pos, n, &info->modelist) {
1946 modelist = list_entry(pos, struct fb_modelist, list);
1947 m = &modelist->mode;
1948 fb_videomode_to_var(&var, m);
1949 var.activate = FB_ACTIVATE_TEST;
1950 err = fb_set_var(info, &var);
1951 fb_var_to_videomode(&mode, &var);
1952 if (err || !fb_mode_is_equal(m, &mode)) {
1953 list_del(pos);
1954 kfree(pos);
1955 }
1956 }
1957
1958 if (list_empty(&info->modelist))
1959 return 1;
1960
1961 fbcon_new_modelist(info);
1962
1963 return 0;
1964 }
1965
1966 MODULE_LICENSE("GPL");
Linux with added FPC-III support