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
get_fb_info(unsigned int idx)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(®istration_lock);
68 fb_info = registered_fb[idx];
69 if (fb_info)
70 atomic_inc(&fb_info->count);
71 mutex_unlock(®istration_lock);
72
73 return fb_info;
74 }
75
put_fb_info(struct fb_info * fb_info)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
fb_get_color_depth(struct fb_var_screeninfo * var,struct fb_fix_screeninfo * fix)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 */
fb_pad_aligned_buffer(u8 * dst,u32 d_pitch,u8 * src,u32 s_pitch,u32 height)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
fb_pad_unaligned_buffer(u8 * dst,u32 d_pitch,u8 * src,u32 idx,u32 height,u32 shift_high,u32 shift_low,u32 mod)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 */
fb_get_buffer_offset(struct fb_info * info,struct fb_pixmap * buf,u32 size)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
safe_shift(unsigned d,int n)189 static inline unsigned safe_shift(unsigned d, int n)
190 {
191 return n < 0 ? d >> -n : d << n;
192 }
193
fb_set_logocmap(struct fb_info * info,const struct linux_logo * logo)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
fb_set_logo_truepalette(struct fb_info * info,const struct linux_logo * logo,u32 * palette)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
fb_set_logo_directpalette(struct fb_info * info,const struct linux_logo * logo,u32 * palette)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
fb_set_logo(struct fb_info * info,const struct linux_logo * logo,u8 * dst,int depth)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
fb_rotate_logo_ud(const u8 * in,u8 * out,u32 width,u32 height)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
fb_rotate_logo_cw(const u8 * in,u8 * out,u32 width,u32 height)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
fb_rotate_logo_ccw(const u8 * in,u8 * out,u32 width,u32 height)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
fb_rotate_logo(struct fb_info * info,u8 * dst,struct fb_image * image,int rotate)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
fb_do_show_logo(struct fb_info * info,struct fb_image * image,int rotate,unsigned int num)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
fb_show_logo_line(struct fb_info * info,int rotate,const struct linux_logo * logo,int y,unsigned int n)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
fb_append_extra_logo(const struct linux_logo * logo,unsigned int n)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
fb_prepare_extra_logos(struct fb_info * info,unsigned int height,unsigned int yres)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
fb_show_extra_logos(struct fb_info * info,int y,int rotate)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
fb_prepare_extra_logos(struct fb_info * info,unsigned int height,unsigned int yres)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
fb_show_extra_logos(struct fb_info * info,int y,int rotate)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
fb_prepare_logo(struct fb_info * info,int rotate)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
fb_show_logo(struct fb_info * info,int rotate)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
fb_prepare_logo(struct fb_info * info,int rotate)703 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
fb_show_logo(struct fb_info * info,int rotate)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
fb_seq_start(struct seq_file * m,loff_t * pos)709 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
710 {
711 mutex_lock(®istration_lock);
712 return (*pos < FB_MAX) ? pos : NULL;
713 }
714
fb_seq_next(struct seq_file * m,void * v,loff_t * pos)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
fb_seq_stop(struct seq_file * m,void * v)721 static void fb_seq_stop(struct seq_file *m, void *v)
722 {
723 mutex_unlock(®istration_lock);
724 }
725
fb_seq_show(struct seq_file * m,void * v)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 */
file_fb_info(struct file * file)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
fb_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)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
fb_write(struct file * file,const char __user * buf,size_t count,loff_t * ppos)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
fb_pan_display(struct fb_info * info,struct fb_var_screeninfo * var)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
fb_check_caps(struct fb_info * info,struct fb_var_screeninfo * var,u32 activate)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
fb_set_var(struct fb_info * info,struct fb_var_screeninfo * var)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 u32 unused;
966
967 if (var->activate & FB_ACTIVATE_INV_MODE) {
968 struct fb_videomode mode1, mode2;
969
970 fb_var_to_videomode(&mode1, var);
971 fb_var_to_videomode(&mode2, &info->var);
972 /* make sure we don't delete the videomode of current var */
973 ret = fb_mode_is_equal(&mode1, &mode2);
974 if (!ret) {
975 ret = fbcon_mode_deleted(info, &mode1);
976 if (!ret)
977 fb_delete_videomode(&mode1, &info->modelist);
978 }
979
980 return ret ? -EINVAL : 0;
981 }
982
983 if (!(var->activate & FB_ACTIVATE_FORCE) &&
984 !memcmp(&info->var, var, sizeof(struct fb_var_screeninfo)))
985 return 0;
986
987 activate = var->activate;
988
989 /* When using FOURCC mode, make sure the red, green, blue and
990 * transp fields are set to 0.
991 */
992 if ((info->fix.capabilities & FB_CAP_FOURCC) &&
993 var->grayscale > 1) {
994 if (var->red.offset || var->green.offset ||
995 var->blue.offset || var->transp.offset ||
996 var->red.length || var->green.length ||
997 var->blue.length || var->transp.length ||
998 var->red.msb_right || var->green.msb_right ||
999 var->blue.msb_right || var->transp.msb_right)
1000 return -EINVAL;
1001 }
1002
1003 if (!info->fbops->fb_check_var) {
1004 *var = info->var;
1005 return 0;
1006 }
1007
1008 /* bitfill_aligned() assumes that it's at least 8x8 */
1009 if (var->xres < 8 || var->yres < 8)
1010 return -EINVAL;
1011
1012 /* Too huge resolution causes multiplication overflow. */
1013 if (check_mul_overflow(var->xres, var->yres, &unused) ||
1014 check_mul_overflow(var->xres_virtual, var->yres_virtual, &unused))
1015 return -EINVAL;
1016
1017 ret = info->fbops->fb_check_var(var, info);
1018
1019 if (ret)
1020 return ret;
1021
1022 /* verify that virtual resolution >= physical resolution */
1023 if (var->xres_virtual < var->xres ||
1024 var->yres_virtual < var->yres) {
1025 pr_warn("WARNING: fbcon: Driver '%s' missed to adjust virtual screen size (%ux%u vs. %ux%u)\n",
1026 info->fix.id,
1027 var->xres_virtual, var->yres_virtual,
1028 var->xres, var->yres);
1029 return -EINVAL;
1030 }
1031
1032 if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW)
1033 return 0;
1034
1035 if (info->fbops->fb_get_caps) {
1036 ret = fb_check_caps(info, var, activate);
1037
1038 if (ret)
1039 return ret;
1040 }
1041
1042 old_var = info->var;
1043 info->var = *var;
1044
1045 if (info->fbops->fb_set_par) {
1046 ret = info->fbops->fb_set_par(info);
1047
1048 if (ret) {
1049 info->var = old_var;
1050 printk(KERN_WARNING "detected "
1051 "fb_set_par error, "
1052 "error code: %d\n", ret);
1053 return ret;
1054 }
1055 }
1056
1057 fb_pan_display(info, &info->var);
1058 fb_set_cmap(&info->cmap, info);
1059 fb_var_to_videomode(&mode, &info->var);
1060
1061 if (info->modelist.prev && info->modelist.next &&
1062 !list_empty(&info->modelist))
1063 ret = fb_add_videomode(&mode, &info->modelist);
1064
1065 if (ret)
1066 return ret;
1067
1068 event.info = info;
1069 event.data = &mode;
1070 fb_notifier_call_chain(FB_EVENT_MODE_CHANGE, &event);
1071
1072 return 0;
1073 }
1074 EXPORT_SYMBOL(fb_set_var);
1075
1076 int
fb_blank(struct fb_info * info,int blank)1077 fb_blank(struct fb_info *info, int blank)
1078 {
1079 struct fb_event event;
1080 int ret = -EINVAL;
1081
1082 if (blank > FB_BLANK_POWERDOWN)
1083 blank = FB_BLANK_POWERDOWN;
1084
1085 event.info = info;
1086 event.data = ␣
1087
1088 if (info->fbops->fb_blank)
1089 ret = info->fbops->fb_blank(blank, info);
1090
1091 if (!ret)
1092 fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1093
1094 return ret;
1095 }
1096 EXPORT_SYMBOL(fb_blank);
1097
do_fb_ioctl(struct fb_info * info,unsigned int cmd,unsigned long arg)1098 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1099 unsigned long arg)
1100 {
1101 const struct fb_ops *fb;
1102 struct fb_var_screeninfo var;
1103 struct fb_fix_screeninfo fix;
1104 struct fb_cmap cmap_from;
1105 struct fb_cmap_user cmap;
1106 void __user *argp = (void __user *)arg;
1107 long ret = 0;
1108
1109 switch (cmd) {
1110 case FBIOGET_VSCREENINFO:
1111 lock_fb_info(info);
1112 var = info->var;
1113 unlock_fb_info(info);
1114
1115 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1116 break;
1117 case FBIOPUT_VSCREENINFO:
1118 if (copy_from_user(&var, argp, sizeof(var)))
1119 return -EFAULT;
1120 console_lock();
1121 lock_fb_info(info);
1122 ret = fbcon_modechange_possible(info, &var);
1123 if (!ret)
1124 ret = fb_set_var(info, &var);
1125 if (!ret)
1126 fbcon_update_vcs(info, var.activate & FB_ACTIVATE_ALL);
1127 unlock_fb_info(info);
1128 console_unlock();
1129 if (!ret && copy_to_user(argp, &var, sizeof(var)))
1130 ret = -EFAULT;
1131 break;
1132 case FBIOGET_FSCREENINFO:
1133 lock_fb_info(info);
1134 memcpy(&fix, &info->fix, sizeof(fix));
1135 if (info->flags & FBINFO_HIDE_SMEM_START)
1136 fix.smem_start = 0;
1137 unlock_fb_info(info);
1138
1139 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1140 break;
1141 case FBIOPUTCMAP:
1142 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1143 return -EFAULT;
1144 ret = fb_set_user_cmap(&cmap, info);
1145 break;
1146 case FBIOGETCMAP:
1147 if (copy_from_user(&cmap, argp, sizeof(cmap)))
1148 return -EFAULT;
1149 lock_fb_info(info);
1150 cmap_from = info->cmap;
1151 unlock_fb_info(info);
1152 ret = fb_cmap_to_user(&cmap_from, &cmap);
1153 break;
1154 case FBIOPAN_DISPLAY:
1155 if (copy_from_user(&var, argp, sizeof(var)))
1156 return -EFAULT;
1157 console_lock();
1158 lock_fb_info(info);
1159 ret = fb_pan_display(info, &var);
1160 unlock_fb_info(info);
1161 console_unlock();
1162 if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1163 return -EFAULT;
1164 break;
1165 case FBIO_CURSOR:
1166 ret = -EINVAL;
1167 break;
1168 case FBIOGET_CON2FBMAP:
1169 ret = fbcon_get_con2fb_map_ioctl(argp);
1170 break;
1171 case FBIOPUT_CON2FBMAP:
1172 ret = fbcon_set_con2fb_map_ioctl(argp);
1173 break;
1174 case FBIOBLANK:
1175 console_lock();
1176 lock_fb_info(info);
1177 ret = fb_blank(info, arg);
1178 /* might again call into fb_blank */
1179 fbcon_fb_blanked(info, arg);
1180 unlock_fb_info(info);
1181 console_unlock();
1182 break;
1183 default:
1184 lock_fb_info(info);
1185 fb = info->fbops;
1186 if (fb->fb_ioctl)
1187 ret = fb->fb_ioctl(info, cmd, arg);
1188 else
1189 ret = -ENOTTY;
1190 unlock_fb_info(info);
1191 }
1192 return ret;
1193 }
1194
fb_ioctl(struct file * file,unsigned int cmd,unsigned long arg)1195 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1196 {
1197 struct fb_info *info = file_fb_info(file);
1198
1199 if (!info)
1200 return -ENODEV;
1201 return do_fb_ioctl(info, cmd, arg);
1202 }
1203
1204 #ifdef CONFIG_COMPAT
1205 struct fb_fix_screeninfo32 {
1206 char id[16];
1207 compat_caddr_t smem_start;
1208 u32 smem_len;
1209 u32 type;
1210 u32 type_aux;
1211 u32 visual;
1212 u16 xpanstep;
1213 u16 ypanstep;
1214 u16 ywrapstep;
1215 u32 line_length;
1216 compat_caddr_t mmio_start;
1217 u32 mmio_len;
1218 u32 accel;
1219 u16 reserved[3];
1220 };
1221
1222 struct fb_cmap32 {
1223 u32 start;
1224 u32 len;
1225 compat_caddr_t red;
1226 compat_caddr_t green;
1227 compat_caddr_t blue;
1228 compat_caddr_t transp;
1229 };
1230
fb_getput_cmap(struct fb_info * info,unsigned int cmd,unsigned long arg)1231 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1232 unsigned long arg)
1233 {
1234 struct fb_cmap_user __user *cmap;
1235 struct fb_cmap32 __user *cmap32;
1236 __u32 data;
1237 int err;
1238
1239 cmap = compat_alloc_user_space(sizeof(*cmap));
1240 cmap32 = compat_ptr(arg);
1241
1242 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1243 return -EFAULT;
1244
1245 if (get_user(data, &cmap32->red) ||
1246 put_user(compat_ptr(data), &cmap->red) ||
1247 get_user(data, &cmap32->green) ||
1248 put_user(compat_ptr(data), &cmap->green) ||
1249 get_user(data, &cmap32->blue) ||
1250 put_user(compat_ptr(data), &cmap->blue) ||
1251 get_user(data, &cmap32->transp) ||
1252 put_user(compat_ptr(data), &cmap->transp))
1253 return -EFAULT;
1254
1255 err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1256
1257 if (!err) {
1258 if (copy_in_user(&cmap32->start,
1259 &cmap->start,
1260 2 * sizeof(__u32)))
1261 err = -EFAULT;
1262 }
1263 return err;
1264 }
1265
do_fscreeninfo_to_user(struct fb_fix_screeninfo * fix,struct fb_fix_screeninfo32 __user * fix32)1266 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1267 struct fb_fix_screeninfo32 __user *fix32)
1268 {
1269 __u32 data;
1270 int err;
1271
1272 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1273
1274 data = (__u32) (unsigned long) fix->smem_start;
1275 err |= put_user(data, &fix32->smem_start);
1276
1277 err |= put_user(fix->smem_len, &fix32->smem_len);
1278 err |= put_user(fix->type, &fix32->type);
1279 err |= put_user(fix->type_aux, &fix32->type_aux);
1280 err |= put_user(fix->visual, &fix32->visual);
1281 err |= put_user(fix->xpanstep, &fix32->xpanstep);
1282 err |= put_user(fix->ypanstep, &fix32->ypanstep);
1283 err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1284 err |= put_user(fix->line_length, &fix32->line_length);
1285
1286 data = (__u32) (unsigned long) fix->mmio_start;
1287 err |= put_user(data, &fix32->mmio_start);
1288
1289 err |= put_user(fix->mmio_len, &fix32->mmio_len);
1290 err |= put_user(fix->accel, &fix32->accel);
1291 err |= copy_to_user(fix32->reserved, fix->reserved,
1292 sizeof(fix->reserved));
1293
1294 if (err)
1295 return -EFAULT;
1296 return 0;
1297 }
1298
fb_get_fscreeninfo(struct fb_info * info,unsigned int cmd,unsigned long arg)1299 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1300 unsigned long arg)
1301 {
1302 struct fb_fix_screeninfo fix;
1303
1304 lock_fb_info(info);
1305 fix = info->fix;
1306 if (info->flags & FBINFO_HIDE_SMEM_START)
1307 fix.smem_start = 0;
1308 unlock_fb_info(info);
1309 return do_fscreeninfo_to_user(&fix, compat_ptr(arg));
1310 }
1311
fb_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)1312 static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1313 unsigned long arg)
1314 {
1315 struct fb_info *info = file_fb_info(file);
1316 const struct fb_ops *fb;
1317 long ret = -ENOIOCTLCMD;
1318
1319 if (!info)
1320 return -ENODEV;
1321 fb = info->fbops;
1322 switch(cmd) {
1323 case FBIOGET_VSCREENINFO:
1324 case FBIOPUT_VSCREENINFO:
1325 case FBIOPAN_DISPLAY:
1326 case FBIOGET_CON2FBMAP:
1327 case FBIOPUT_CON2FBMAP:
1328 arg = (unsigned long) compat_ptr(arg);
1329 fallthrough;
1330 case FBIOBLANK:
1331 ret = do_fb_ioctl(info, cmd, arg);
1332 break;
1333
1334 case FBIOGET_FSCREENINFO:
1335 ret = fb_get_fscreeninfo(info, cmd, arg);
1336 break;
1337
1338 case FBIOGETCMAP:
1339 case FBIOPUTCMAP:
1340 ret = fb_getput_cmap(info, cmd, arg);
1341 break;
1342
1343 default:
1344 if (fb->fb_compat_ioctl)
1345 ret = fb->fb_compat_ioctl(info, cmd, arg);
1346 break;
1347 }
1348 return ret;
1349 }
1350 #endif
1351
1352 static int
fb_mmap(struct file * file,struct vm_area_struct * vma)1353 fb_mmap(struct file *file, struct vm_area_struct * vma)
1354 {
1355 struct fb_info *info = file_fb_info(file);
1356 int (*fb_mmap_fn)(struct fb_info *info, struct vm_area_struct *vma);
1357 unsigned long mmio_pgoff;
1358 unsigned long start;
1359 u32 len;
1360
1361 if (!info)
1362 return -ENODEV;
1363 mutex_lock(&info->mm_lock);
1364
1365 fb_mmap_fn = info->fbops->fb_mmap;
1366
1367 #if IS_ENABLED(CONFIG_FB_DEFERRED_IO)
1368 if (info->fbdefio)
1369 fb_mmap_fn = fb_deferred_io_mmap;
1370 #endif
1371
1372 if (fb_mmap_fn) {
1373 int res;
1374
1375 /*
1376 * The framebuffer needs to be accessed decrypted, be sure
1377 * SME protection is removed ahead of the call
1378 */
1379 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1380 res = fb_mmap_fn(info, vma);
1381 mutex_unlock(&info->mm_lock);
1382 return res;
1383 }
1384
1385 /*
1386 * Ugh. This can be either the frame buffer mapping, or
1387 * if pgoff points past it, the mmio mapping.
1388 */
1389 start = info->fix.smem_start;
1390 len = info->fix.smem_len;
1391 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
1392 if (vma->vm_pgoff >= mmio_pgoff) {
1393 if (info->var.accel_flags) {
1394 mutex_unlock(&info->mm_lock);
1395 return -EINVAL;
1396 }
1397
1398 vma->vm_pgoff -= mmio_pgoff;
1399 start = info->fix.mmio_start;
1400 len = info->fix.mmio_len;
1401 }
1402 mutex_unlock(&info->mm_lock);
1403
1404 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1405 /*
1406 * The framebuffer needs to be accessed decrypted, be sure
1407 * SME protection is removed
1408 */
1409 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
1410 fb_pgprotect(file, vma, start);
1411
1412 return vm_iomap_memory(vma, start, len);
1413 }
1414
1415 static int
fb_open(struct inode * inode,struct file * file)1416 fb_open(struct inode *inode, struct file *file)
1417 __acquires(&info->lock)
1418 __releases(&info->lock)
1419 {
1420 int fbidx = iminor(inode);
1421 struct fb_info *info;
1422 int res = 0;
1423
1424 info = get_fb_info(fbidx);
1425 if (!info) {
1426 request_module("fb%d", fbidx);
1427 info = get_fb_info(fbidx);
1428 if (!info)
1429 return -ENODEV;
1430 }
1431 if (IS_ERR(info))
1432 return PTR_ERR(info);
1433
1434 lock_fb_info(info);
1435 if (!try_module_get(info->fbops->owner)) {
1436 res = -ENODEV;
1437 goto out;
1438 }
1439 file->private_data = info;
1440 if (info->fbops->fb_open) {
1441 res = info->fbops->fb_open(info,1);
1442 if (res)
1443 module_put(info->fbops->owner);
1444 }
1445 #ifdef CONFIG_FB_DEFERRED_IO
1446 if (info->fbdefio)
1447 fb_deferred_io_open(info, inode, file);
1448 #endif
1449 out:
1450 unlock_fb_info(info);
1451 if (res)
1452 put_fb_info(info);
1453 return res;
1454 }
1455
1456 static int
fb_release(struct inode * inode,struct file * file)1457 fb_release(struct inode *inode, struct file *file)
1458 __acquires(&info->lock)
1459 __releases(&info->lock)
1460 {
1461 struct fb_info * const info = file->private_data;
1462
1463 lock_fb_info(info);
1464 if (info->fbops->fb_release)
1465 info->fbops->fb_release(info,1);
1466 module_put(info->fbops->owner);
1467 unlock_fb_info(info);
1468 put_fb_info(info);
1469 return 0;
1470 }
1471
1472 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU)
get_fb_unmapped_area(struct file * filp,unsigned long addr,unsigned long len,unsigned long pgoff,unsigned long flags)1473 unsigned long get_fb_unmapped_area(struct file *filp,
1474 unsigned long addr, unsigned long len,
1475 unsigned long pgoff, unsigned long flags)
1476 {
1477 struct fb_info * const info = filp->private_data;
1478 unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
1479
1480 if (pgoff > fb_size || len > fb_size - pgoff)
1481 return -EINVAL;
1482
1483 return (unsigned long)info->screen_base + pgoff;
1484 }
1485 #endif
1486
1487 static const struct file_operations fb_fops = {
1488 .owner = THIS_MODULE,
1489 .read = fb_read,
1490 .write = fb_write,
1491 .unlocked_ioctl = fb_ioctl,
1492 #ifdef CONFIG_COMPAT
1493 .compat_ioctl = fb_compat_ioctl,
1494 #endif
1495 .mmap = fb_mmap,
1496 .open = fb_open,
1497 .release = fb_release,
1498 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \
1499 (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \
1500 !defined(CONFIG_MMU))
1501 .get_unmapped_area = get_fb_unmapped_area,
1502 #endif
1503 #ifdef CONFIG_FB_DEFERRED_IO
1504 .fsync = fb_deferred_io_fsync,
1505 #endif
1506 .llseek = default_llseek,
1507 };
1508
1509 struct class *fb_class;
1510 EXPORT_SYMBOL(fb_class);
1511
fb_check_foreignness(struct fb_info * fi)1512 static int fb_check_foreignness(struct fb_info *fi)
1513 {
1514 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1515
1516 fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1517
1518 #ifdef __BIG_ENDIAN
1519 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1520 #else
1521 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1522 #endif /* __BIG_ENDIAN */
1523
1524 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1525 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1526 "support this framebuffer\n", fi->fix.id);
1527 return -ENOSYS;
1528 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1529 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1530 "support this framebuffer\n", fi->fix.id);
1531 return -ENOSYS;
1532 }
1533
1534 return 0;
1535 }
1536
apertures_overlap(struct aperture * gen,struct aperture * hw)1537 static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1538 {
1539 /* is the generic aperture base the same as the HW one */
1540 if (gen->base == hw->base)
1541 return true;
1542 /* is the generic aperture base inside the hw base->hw base+size */
1543 if (gen->base > hw->base && gen->base < hw->base + hw->size)
1544 return true;
1545 return false;
1546 }
1547
fb_do_apertures_overlap(struct apertures_struct * gena,struct apertures_struct * hwa)1548 static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1549 struct apertures_struct *hwa)
1550 {
1551 int i, j;
1552 if (!hwa || !gena)
1553 return false;
1554
1555 for (i = 0; i < hwa->count; ++i) {
1556 struct aperture *h = &hwa->ranges[i];
1557 for (j = 0; j < gena->count; ++j) {
1558 struct aperture *g = &gena->ranges[j];
1559 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1560 (unsigned long long)g->base,
1561 (unsigned long long)g->size,
1562 (unsigned long long)h->base,
1563 (unsigned long long)h->size);
1564 if (apertures_overlap(g, h))
1565 return true;
1566 }
1567 }
1568
1569 return false;
1570 }
1571
1572 static void do_unregister_framebuffer(struct fb_info *fb_info);
1573
1574 #define VGA_FB_PHYS 0xA0000
do_remove_conflicting_framebuffers(struct apertures_struct * a,const char * name,bool primary)1575 static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
1576 const char *name, bool primary)
1577 {
1578 int i;
1579
1580 /* check all firmware fbs and kick off if the base addr overlaps */
1581 for_each_registered_fb(i) {
1582 struct apertures_struct *gen_aper;
1583
1584 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1585 continue;
1586
1587 gen_aper = registered_fb[i]->apertures;
1588 if (fb_do_apertures_overlap(gen_aper, a) ||
1589 (primary && gen_aper && gen_aper->count &&
1590 gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1591
1592 printk(KERN_INFO "fb%d: switching to %s from %s\n",
1593 i, name, registered_fb[i]->fix.id);
1594 do_unregister_framebuffer(registered_fb[i]);
1595 }
1596 }
1597 }
1598
1599 static bool lockless_register_fb;
1600 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400);
1601 MODULE_PARM_DESC(lockless_register_fb,
1602 "Lockless framebuffer registration for debugging [default=off]");
1603
do_register_framebuffer(struct fb_info * fb_info)1604 static int do_register_framebuffer(struct fb_info *fb_info)
1605 {
1606 int i, ret;
1607 struct fb_videomode mode;
1608
1609 if (fb_check_foreignness(fb_info))
1610 return -ENOSYS;
1611
1612 do_remove_conflicting_framebuffers(fb_info->apertures,
1613 fb_info->fix.id,
1614 fb_is_primary_device(fb_info));
1615
1616 if (num_registered_fb == FB_MAX)
1617 return -ENXIO;
1618
1619 num_registered_fb++;
1620 for (i = 0 ; i < FB_MAX; i++)
1621 if (!registered_fb[i])
1622 break;
1623 fb_info->node = i;
1624 atomic_set(&fb_info->count, 1);
1625 mutex_init(&fb_info->lock);
1626 mutex_init(&fb_info->mm_lock);
1627
1628 fb_info->dev = device_create(fb_class, fb_info->device,
1629 MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1630 if (IS_ERR(fb_info->dev)) {
1631 /* Not fatal */
1632 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1633 fb_info->dev = NULL;
1634 } else
1635 fb_init_device(fb_info);
1636
1637 if (fb_info->pixmap.addr == NULL) {
1638 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1639 if (fb_info->pixmap.addr) {
1640 fb_info->pixmap.size = FBPIXMAPSIZE;
1641 fb_info->pixmap.buf_align = 1;
1642 fb_info->pixmap.scan_align = 1;
1643 fb_info->pixmap.access_align = 32;
1644 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1645 }
1646 }
1647 fb_info->pixmap.offset = 0;
1648
1649 if (!fb_info->pixmap.blit_x)
1650 fb_info->pixmap.blit_x = ~(u32)0;
1651
1652 if (!fb_info->pixmap.blit_y)
1653 fb_info->pixmap.blit_y = ~(u32)0;
1654
1655 if (!fb_info->modelist.prev || !fb_info->modelist.next)
1656 INIT_LIST_HEAD(&fb_info->modelist);
1657
1658 if (fb_info->skip_vt_switch)
1659 pm_vt_switch_required(fb_info->dev, false);
1660 else
1661 pm_vt_switch_required(fb_info->dev, true);
1662
1663 fb_var_to_videomode(&mode, &fb_info->var);
1664 fb_add_videomode(&mode, &fb_info->modelist);
1665 registered_fb[i] = fb_info;
1666
1667 #ifdef CONFIG_GUMSTIX_AM200EPD
1668 {
1669 struct fb_event event;
1670 event.info = fb_info;
1671 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1672 }
1673 #endif
1674
1675 if (!lockless_register_fb)
1676 console_lock();
1677 else
1678 atomic_inc(&ignore_console_lock_warning);
1679 lock_fb_info(fb_info);
1680 ret = fbcon_fb_registered(fb_info);
1681 unlock_fb_info(fb_info);
1682
1683 if (!lockless_register_fb)
1684 console_unlock();
1685 else
1686 atomic_dec(&ignore_console_lock_warning);
1687 return ret;
1688 }
1689
unbind_console(struct fb_info * fb_info)1690 static void unbind_console(struct fb_info *fb_info)
1691 {
1692 int i = fb_info->node;
1693
1694 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1695 return;
1696
1697 console_lock();
1698 lock_fb_info(fb_info);
1699 fbcon_fb_unbind(fb_info);
1700 unlock_fb_info(fb_info);
1701 console_unlock();
1702 }
1703
unlink_framebuffer(struct fb_info * fb_info)1704 static void unlink_framebuffer(struct fb_info *fb_info)
1705 {
1706 int i;
1707
1708 i = fb_info->node;
1709 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info))
1710 return;
1711
1712 if (!fb_info->dev)
1713 return;
1714
1715 device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1716
1717 pm_vt_switch_unregister(fb_info->dev);
1718
1719 unbind_console(fb_info);
1720
1721 fb_info->dev = NULL;
1722 }
1723
do_unregister_framebuffer(struct fb_info * fb_info)1724 static void do_unregister_framebuffer(struct fb_info *fb_info)
1725 {
1726 unlink_framebuffer(fb_info);
1727 if (fb_info->pixmap.addr &&
1728 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1729 kfree(fb_info->pixmap.addr);
1730 fb_destroy_modelist(&fb_info->modelist);
1731 registered_fb[fb_info->node] = NULL;
1732 num_registered_fb--;
1733 fb_cleanup_device(fb_info);
1734 #ifdef CONFIG_GUMSTIX_AM200EPD
1735 {
1736 struct fb_event event;
1737 event.info = fb_info;
1738 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1739 }
1740 #endif
1741 console_lock();
1742 fbcon_fb_unregistered(fb_info);
1743 console_unlock();
1744
1745 /* this may free fb info */
1746 put_fb_info(fb_info);
1747 }
1748
1749 /**
1750 * remove_conflicting_framebuffers - remove firmware-configured framebuffers
1751 * @a: memory range, users of which are to be removed
1752 * @name: requesting driver name
1753 * @primary: also kick vga16fb if present
1754 *
1755 * This function removes framebuffer devices (initialized by firmware/bootloader)
1756 * which use memory range described by @a. If @a is NULL all such devices are
1757 * removed.
1758 */
remove_conflicting_framebuffers(struct apertures_struct * a,const char * name,bool primary)1759 int remove_conflicting_framebuffers(struct apertures_struct *a,
1760 const char *name, bool primary)
1761 {
1762 bool do_free = false;
1763
1764 if (!a) {
1765 a = alloc_apertures(1);
1766 if (!a)
1767 return -ENOMEM;
1768
1769 a->ranges[0].base = 0;
1770 a->ranges[0].size = ~0;
1771 do_free = true;
1772 }
1773
1774 mutex_lock(®istration_lock);
1775 do_remove_conflicting_framebuffers(a, name, primary);
1776 mutex_unlock(®istration_lock);
1777
1778 if (do_free)
1779 kfree(a);
1780
1781 return 0;
1782 }
1783 EXPORT_SYMBOL(remove_conflicting_framebuffers);
1784
1785 /**
1786 * remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices
1787 * @pdev: PCI device
1788 * @name: requesting driver name
1789 *
1790 * This function removes framebuffer devices (eg. initialized by firmware)
1791 * using memory range configured for any of @pdev's memory bars.
1792 *
1793 * The function assumes that PCI device with shadowed ROM drives a primary
1794 * display and so kicks out vga16fb.
1795 */
remove_conflicting_pci_framebuffers(struct pci_dev * pdev,const char * name)1796 int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, const char *name)
1797 {
1798 struct apertures_struct *ap;
1799 bool primary = false;
1800 int err, idx, bar;
1801
1802 for (idx = 0, bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
1803 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
1804 continue;
1805 idx++;
1806 }
1807
1808 ap = alloc_apertures(idx);
1809 if (!ap)
1810 return -ENOMEM;
1811
1812 for (idx = 0, bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
1813 if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
1814 continue;
1815 ap->ranges[idx].base = pci_resource_start(pdev, bar);
1816 ap->ranges[idx].size = pci_resource_len(pdev, bar);
1817 pci_dbg(pdev, "%s: bar %d: 0x%lx -> 0x%lx\n", __func__, bar,
1818 (unsigned long)pci_resource_start(pdev, bar),
1819 (unsigned long)pci_resource_end(pdev, bar));
1820 idx++;
1821 }
1822
1823 #ifdef CONFIG_X86
1824 primary = pdev->resource[PCI_ROM_RESOURCE].flags &
1825 IORESOURCE_ROM_SHADOW;
1826 #endif
1827 err = remove_conflicting_framebuffers(ap, name, primary);
1828 kfree(ap);
1829 return err;
1830 }
1831 EXPORT_SYMBOL(remove_conflicting_pci_framebuffers);
1832
1833 /**
1834 * register_framebuffer - registers a frame buffer device
1835 * @fb_info: frame buffer info structure
1836 *
1837 * Registers a frame buffer device @fb_info.
1838 *
1839 * Returns negative errno on error, or zero for success.
1840 *
1841 */
1842 int
register_framebuffer(struct fb_info * fb_info)1843 register_framebuffer(struct fb_info *fb_info)
1844 {
1845 int ret;
1846
1847 mutex_lock(®istration_lock);
1848 ret = do_register_framebuffer(fb_info);
1849 mutex_unlock(®istration_lock);
1850
1851 return ret;
1852 }
1853 EXPORT_SYMBOL(register_framebuffer);
1854
1855 /**
1856 * unregister_framebuffer - releases a frame buffer device
1857 * @fb_info: frame buffer info structure
1858 *
1859 * Unregisters a frame buffer device @fb_info.
1860 *
1861 * Returns negative errno on error, or zero for success.
1862 *
1863 * This function will also notify the framebuffer console
1864 * to release the driver.
1865 *
1866 * This is meant to be called within a driver's module_exit()
1867 * function. If this is called outside module_exit(), ensure
1868 * that the driver implements fb_open() and fb_release() to
1869 * check that no processes are using the device.
1870 */
1871 void
unregister_framebuffer(struct fb_info * fb_info)1872 unregister_framebuffer(struct fb_info *fb_info)
1873 {
1874 mutex_lock(®istration_lock);
1875 do_unregister_framebuffer(fb_info);
1876 mutex_unlock(®istration_lock);
1877 }
1878 EXPORT_SYMBOL(unregister_framebuffer);
1879
1880 /**
1881 * fb_set_suspend - low level driver signals suspend
1882 * @info: framebuffer affected
1883 * @state: 0 = resuming, !=0 = suspending
1884 *
1885 * This is meant to be used by low level drivers to
1886 * signal suspend/resume to the core & clients.
1887 * It must be called with the console semaphore held
1888 */
fb_set_suspend(struct fb_info * info,int state)1889 void fb_set_suspend(struct fb_info *info, int state)
1890 {
1891 WARN_CONSOLE_UNLOCKED();
1892
1893 if (state) {
1894 fbcon_suspended(info);
1895 info->state = FBINFO_STATE_SUSPENDED;
1896 } else {
1897 info->state = FBINFO_STATE_RUNNING;
1898 fbcon_resumed(info);
1899 }
1900 }
1901 EXPORT_SYMBOL(fb_set_suspend);
1902
1903 /**
1904 * fbmem_init - init frame buffer subsystem
1905 *
1906 * Initialize the frame buffer subsystem.
1907 *
1908 * NOTE: This function is _only_ to be called by drivers/char/mem.c.
1909 *
1910 */
1911
1912 static int __init
fbmem_init(void)1913 fbmem_init(void)
1914 {
1915 int ret;
1916
1917 if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops))
1918 return -ENOMEM;
1919
1920 ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
1921 if (ret) {
1922 printk("unable to get major %d for fb devs\n", FB_MAJOR);
1923 goto err_chrdev;
1924 }
1925
1926 fb_class = class_create(THIS_MODULE, "graphics");
1927 if (IS_ERR(fb_class)) {
1928 ret = PTR_ERR(fb_class);
1929 pr_warn("Unable to create fb class; errno = %d\n", ret);
1930 fb_class = NULL;
1931 goto err_class;
1932 }
1933
1934 fb_console_init();
1935
1936 return 0;
1937
1938 err_class:
1939 unregister_chrdev(FB_MAJOR, "fb");
1940 err_chrdev:
1941 remove_proc_entry("fb", NULL);
1942 return ret;
1943 }
1944
1945 #ifdef MODULE
1946 module_init(fbmem_init);
1947 static void __exit
fbmem_exit(void)1948 fbmem_exit(void)
1949 {
1950 fb_console_exit();
1951
1952 remove_proc_entry("fb", NULL);
1953 class_destroy(fb_class);
1954 unregister_chrdev(FB_MAJOR, "fb");
1955 }
1956
1957 module_exit(fbmem_exit);
1958 MODULE_LICENSE("GPL");
1959 MODULE_DESCRIPTION("Framebuffer base");
1960 #else
1961 subsys_initcall(fbmem_init);
1962 #endif
1963
fb_new_modelist(struct fb_info * info)1964 int fb_new_modelist(struct fb_info *info)
1965 {
1966 struct fb_var_screeninfo var = info->var;
1967 struct list_head *pos, *n;
1968 struct fb_modelist *modelist;
1969 struct fb_videomode *m, mode;
1970 int err;
1971
1972 list_for_each_safe(pos, n, &info->modelist) {
1973 modelist = list_entry(pos, struct fb_modelist, list);
1974 m = &modelist->mode;
1975 fb_videomode_to_var(&var, m);
1976 var.activate = FB_ACTIVATE_TEST;
1977 err = fb_set_var(info, &var);
1978 fb_var_to_videomode(&mode, &var);
1979 if (err || !fb_mode_is_equal(m, &mode)) {
1980 list_del(pos);
1981 kfree(pos);
1982 }
1983 }
1984
1985 if (list_empty(&info->modelist))
1986 return 1;
1987
1988 fbcon_new_modelist(info);
1989
1990 return 0;
1991 }
1992
1993 MODULE_LICENSE("GPL");
1994