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1/*
2 * Copyright (c) 2006-2009 Red Hat Inc.
3 * Copyright (c) 2006-2008 Intel Corporation
4 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
5 *
6 * DRM framebuffer helper functions
7 *
8 * Permission to use, copy, modify, distribute, and sell this software and its
9 * documentation for any purpose is hereby granted without fee, provided that
10 * the above copyright notice appear in all copies and that both that copyright
11 * notice and this permission notice appear in supporting documentation, and
12 * that the name of the copyright holders not be used in advertising or
13 * publicity pertaining to distribution of the software without specific,
14 * written prior permission. The copyright holders make no representations
15 * about the suitability of this software for any purpose. It is provided "as
16 * is" without express or implied warranty.
17 *
18 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
19 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
20 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
21 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
22 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
23 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
24 * OF THIS SOFTWARE.
25 *
26 * Authors:
27 * Dave Airlie <airlied@linux.ie>
28 * Jesse Barnes <jesse.barnes@intel.com>
29 */
30#include <linux/kernel.h>
31#include <linux/sysrq.h>
32#include <linux/slab.h>
33#include <linux/fb.h>
34#include "drmP.h"
35#include "drm_crtc.h"
36#include "drm_fb_helper.h"
37#include "drm_crtc_helper.h"
38
39MODULE_AUTHOR("David Airlie, Jesse Barnes");
40MODULE_DESCRIPTION("DRM KMS helper");
41MODULE_LICENSE("GPL and additional rights");
42
43static LIST_HEAD(kernel_fb_helper_list);
44
45/* simple single crtc case helper function */
46int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
47{
48 struct drm_device *dev = fb_helper->dev;
49 struct drm_connector *connector;
50 int i;
51
52 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
53 struct drm_fb_helper_connector *fb_helper_connector;
54
55 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
56 if (!fb_helper_connector)
57 goto fail;
58
59 fb_helper_connector->connector = connector;
60 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
61 }
62 return 0;
63fail:
64 for (i = 0; i < fb_helper->connector_count; i++) {
65 kfree(fb_helper->connector_info[i]);
66 fb_helper->connector_info[i] = NULL;
67 }
68 fb_helper->connector_count = 0;
69 return -ENOMEM;
70}
71EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
72
73static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
74{
75 struct drm_fb_helper_connector *fb_helper_conn;
76 int i;
77
78 for (i = 0; i < fb_helper->connector_count; i++) {
79 struct drm_cmdline_mode *mode;
80 struct drm_connector *connector;
81 char *option = NULL;
82
83 fb_helper_conn = fb_helper->connector_info[i];
84 connector = fb_helper_conn->connector;
85 mode = &fb_helper_conn->cmdline_mode;
86
87 /* do something on return - turn off connector maybe */
88 if (fb_get_options(drm_get_connector_name(connector), &option))
89 continue;
90
91 if (drm_mode_parse_command_line_for_connector(option,
92 connector,
93 mode)) {
94 if (mode->force) {
95 const char *s;
96 switch (mode->force) {
97 case DRM_FORCE_OFF: s = "OFF"; break;
98 case DRM_FORCE_ON_DIGITAL: s = "ON - dig"; break;
99 default:
100 case DRM_FORCE_ON: s = "ON"; break;
101 }
102
103 DRM_INFO("forcing %s connector %s\n",
104 drm_get_connector_name(connector), s);
105 connector->force = mode->force;
106 }
107
108 DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
109 drm_get_connector_name(connector),
110 mode->xres, mode->yres,
111 mode->refresh_specified ? mode->refresh : 60,
112 mode->rb ? " reduced blanking" : "",
113 mode->margins ? " with margins" : "",
114 mode->interlace ? " interlaced" : "");
115 }
116
117 }
118 return 0;
119}
120
121static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
122{
123 uint16_t *r_base, *g_base, *b_base;
124 int i;
125
126 r_base = crtc->gamma_store;
127 g_base = r_base + crtc->gamma_size;
128 b_base = g_base + crtc->gamma_size;
129
130 for (i = 0; i < crtc->gamma_size; i++)
131 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
132}
133
134static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
135{
136 uint16_t *r_base, *g_base, *b_base;
137
138 r_base = crtc->gamma_store;
139 g_base = r_base + crtc->gamma_size;
140 b_base = g_base + crtc->gamma_size;
141
142 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
143}
144
145int drm_fb_helper_debug_enter(struct fb_info *info)
146{
147 struct drm_fb_helper *helper = info->par;
148 struct drm_crtc_helper_funcs *funcs;
149 int i;
150
151 if (list_empty(&kernel_fb_helper_list))
152 return false;
153
154 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
155 for (i = 0; i < helper->crtc_count; i++) {
156 struct drm_mode_set *mode_set =
157 &helper->crtc_info[i].mode_set;
158
159 if (!mode_set->crtc->enabled)
160 continue;
161
162 funcs = mode_set->crtc->helper_private;
163 drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
164 funcs->mode_set_base_atomic(mode_set->crtc,
165 mode_set->fb,
166 mode_set->x,
167 mode_set->y,
168 ENTER_ATOMIC_MODE_SET);
169 }
170 }
171
172 return 0;
173}
174EXPORT_SYMBOL(drm_fb_helper_debug_enter);
175
176/* Find the real fb for a given fb helper CRTC */
177static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
178{
179 struct drm_device *dev = crtc->dev;
180 struct drm_crtc *c;
181
182 list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
183 if (crtc->base.id == c->base.id)
184 return c->fb;
185 }
186
187 return NULL;
188}
189
190int drm_fb_helper_debug_leave(struct fb_info *info)
191{
192 struct drm_fb_helper *helper = info->par;
193 struct drm_crtc *crtc;
194 struct drm_crtc_helper_funcs *funcs;
195 struct drm_framebuffer *fb;
196 int i;
197
198 for (i = 0; i < helper->crtc_count; i++) {
199 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
200 crtc = mode_set->crtc;
201 funcs = crtc->helper_private;
202 fb = drm_mode_config_fb(crtc);
203
204 if (!crtc->enabled)
205 continue;
206
207 if (!fb) {
208 DRM_ERROR("no fb to restore??\n");
209 continue;
210 }
211
212 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
213 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
214 crtc->y, LEAVE_ATOMIC_MODE_SET);
215 }
216
217 return 0;
218}
219EXPORT_SYMBOL(drm_fb_helper_debug_leave);
220
221bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
222{
223 bool error = false;
224 int i, ret;
225 for (i = 0; i < fb_helper->crtc_count; i++) {
226 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
227 ret = drm_crtc_helper_set_config(mode_set);
228 if (ret)
229 error = true;
230 }
231 return error;
232}
233EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
234
235bool drm_fb_helper_force_kernel_mode(void)
236{
237 bool ret, error = false;
238 struct drm_fb_helper *helper;
239
240 if (list_empty(&kernel_fb_helper_list))
241 return false;
242
243 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
244 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF)
245 continue;
246
247 ret = drm_fb_helper_restore_fbdev_mode(helper);
248 if (ret)
249 error = true;
250 }
251 return error;
252}
253
254int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
255 void *panic_str)
256{
257 printk(KERN_ERR "panic occurred, switching back to text console\n");
258 return drm_fb_helper_force_kernel_mode();
259}
260EXPORT_SYMBOL(drm_fb_helper_panic);
261
262static struct notifier_block paniced = {
263 .notifier_call = drm_fb_helper_panic,
264};
265
266/**
267 * drm_fb_helper_restore - restore the framebuffer console (kernel) config
268 *
269 * Restore's the kernel's fbcon mode, used for lastclose & panic paths.
270 */
271void drm_fb_helper_restore(void)
272{
273 bool ret;
274 ret = drm_fb_helper_force_kernel_mode();
275 if (ret == true)
276 DRM_ERROR("Failed to restore crtc configuration\n");
277}
278EXPORT_SYMBOL(drm_fb_helper_restore);
279
280#ifdef CONFIG_MAGIC_SYSRQ
281static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
282{
283 drm_fb_helper_restore();
284}
285static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
286
287static void drm_fb_helper_sysrq(int dummy1)
288{
289 schedule_work(&drm_fb_helper_restore_work);
290}
291
292static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
293 .handler = drm_fb_helper_sysrq,
294 .help_msg = "force-fb(V)",
295 .action_msg = "Restore framebuffer console",
296};
297#else
298static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
299#endif
300
301static void drm_fb_helper_on(struct fb_info *info)
302{
303 struct drm_fb_helper *fb_helper = info->par;
304 struct drm_device *dev = fb_helper->dev;
305 struct drm_crtc *crtc;
306 struct drm_crtc_helper_funcs *crtc_funcs;
307 struct drm_connector *connector;
308 struct drm_encoder *encoder;
309 int i, j;
310
311 /*
312 * For each CRTC in this fb, turn the crtc on then,
313 * find all associated encoders and turn them on.
314 */
315 mutex_lock(&dev->mode_config.mutex);
316 for (i = 0; i < fb_helper->crtc_count; i++) {
317 crtc = fb_helper->crtc_info[i].mode_set.crtc;
318 crtc_funcs = crtc->helper_private;
319
320 if (!crtc->enabled)
321 continue;
322
323 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
324
325 /* Walk the connectors & encoders on this fb turning them on */
326 for (j = 0; j < fb_helper->connector_count; j++) {
327 connector = fb_helper->connector_info[j]->connector;
328 connector->dpms = DRM_MODE_DPMS_ON;
329 drm_connector_property_set_value(connector,
330 dev->mode_config.dpms_property,
331 DRM_MODE_DPMS_ON);
332 }
333 /* Found a CRTC on this fb, now find encoders */
334 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
335 if (encoder->crtc == crtc) {
336 struct drm_encoder_helper_funcs *encoder_funcs;
337
338 encoder_funcs = encoder->helper_private;
339 encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);
340 }
341 }
342 }
343 mutex_unlock(&dev->mode_config.mutex);
344}
345
346static void drm_fb_helper_off(struct fb_info *info, int dpms_mode)
347{
348 struct drm_fb_helper *fb_helper = info->par;
349 struct drm_device *dev = fb_helper->dev;
350 struct drm_crtc *crtc;
351 struct drm_crtc_helper_funcs *crtc_funcs;
352 struct drm_connector *connector;
353 struct drm_encoder *encoder;
354 int i, j;
355
356 /*
357 * For each CRTC in this fb, find all associated encoders
358 * and turn them off, then turn off the CRTC.
359 */
360 mutex_lock(&dev->mode_config.mutex);
361 for (i = 0; i < fb_helper->crtc_count; i++) {
362 crtc = fb_helper->crtc_info[i].mode_set.crtc;
363 crtc_funcs = crtc->helper_private;
364
365 if (!crtc->enabled)
366 continue;
367
368 /* Walk the connectors on this fb and mark them off */
369 for (j = 0; j < fb_helper->connector_count; j++) {
370 connector = fb_helper->connector_info[j]->connector;
371 connector->dpms = dpms_mode;
372 drm_connector_property_set_value(connector,
373 dev->mode_config.dpms_property,
374 dpms_mode);
375 }
376 /* Found a CRTC on this fb, now find encoders */
377 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
378 if (encoder->crtc == crtc) {
379 struct drm_encoder_helper_funcs *encoder_funcs;
380
381 encoder_funcs = encoder->helper_private;
382 encoder_funcs->dpms(encoder, dpms_mode);
383 }
384 }
385 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
386 }
387 mutex_unlock(&dev->mode_config.mutex);
388}
389
390int drm_fb_helper_blank(int blank, struct fb_info *info)
391{
392 switch (blank) {
393 /* Display: On; HSync: On, VSync: On */
394 case FB_BLANK_UNBLANK:
395 drm_fb_helper_on(info);
396 break;
397 /* Display: Off; HSync: On, VSync: On */
398 case FB_BLANK_NORMAL:
399 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
400 break;
401 /* Display: Off; HSync: Off, VSync: On */
402 case FB_BLANK_HSYNC_SUSPEND:
403 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
404 break;
405 /* Display: Off; HSync: On, VSync: Off */
406 case FB_BLANK_VSYNC_SUSPEND:
407 drm_fb_helper_off(info, DRM_MODE_DPMS_SUSPEND);
408 break;
409 /* Display: Off; HSync: Off, VSync: Off */
410 case FB_BLANK_POWERDOWN:
411 drm_fb_helper_off(info, DRM_MODE_DPMS_OFF);
412 break;
413 }
414 return 0;
415}
416EXPORT_SYMBOL(drm_fb_helper_blank);
417
418static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
419{
420 int i;
421
422 for (i = 0; i < helper->connector_count; i++)
423 kfree(helper->connector_info[i]);
424 kfree(helper->connector_info);
425 for (i = 0; i < helper->crtc_count; i++)
426 kfree(helper->crtc_info[i].mode_set.connectors);
427 kfree(helper->crtc_info);
428}
429
430int drm_fb_helper_init(struct drm_device *dev,
431 struct drm_fb_helper *fb_helper,
432 int crtc_count, int max_conn_count)
433{
434 struct drm_crtc *crtc;
435 int ret = 0;
436 int i;
437
438 fb_helper->dev = dev;
439
440 INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
441
442 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
443 if (!fb_helper->crtc_info)
444 return -ENOMEM;
445
446 fb_helper->crtc_count = crtc_count;
447 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
448 if (!fb_helper->connector_info) {
449 kfree(fb_helper->crtc_info);
450 return -ENOMEM;
451 }
452 fb_helper->connector_count = 0;
453
454 for (i = 0; i < crtc_count; i++) {
455 fb_helper->crtc_info[i].mode_set.connectors =
456 kcalloc(max_conn_count,
457 sizeof(struct drm_connector *),
458 GFP_KERNEL);
459
460 if (!fb_helper->crtc_info[i].mode_set.connectors) {
461 ret = -ENOMEM;
462 goto out_free;
463 }
464 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
465 }
466
467 i = 0;
468 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
469 fb_helper->crtc_info[i].crtc_id = crtc->base.id;
470 fb_helper->crtc_info[i].mode_set.crtc = crtc;
471 i++;
472 }
473 fb_helper->conn_limit = max_conn_count;
474 return 0;
475out_free:
476 drm_fb_helper_crtc_free(fb_helper);
477 return -ENOMEM;
478}
479EXPORT_SYMBOL(drm_fb_helper_init);
480
481void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
482{
483 if (!list_empty(&fb_helper->kernel_fb_list)) {
484 list_del(&fb_helper->kernel_fb_list);
485 if (list_empty(&kernel_fb_helper_list)) {
486 printk(KERN_INFO "drm: unregistered panic notifier\n");
487 atomic_notifier_chain_unregister(&panic_notifier_list,
488 &paniced);
489 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
490 }
491 }
492
493 drm_fb_helper_crtc_free(fb_helper);
494
495}
496EXPORT_SYMBOL(drm_fb_helper_fini);
497
498static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
499 u16 blue, u16 regno, struct fb_info *info)
500{
501 struct drm_fb_helper *fb_helper = info->par;
502 struct drm_framebuffer *fb = fb_helper->fb;
503 int pindex;
504
505 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
506 u32 *palette;
507 u32 value;
508 /* place color in psuedopalette */
509 if (regno > 16)
510 return -EINVAL;
511 palette = (u32 *)info->pseudo_palette;
512 red >>= (16 - info->var.red.length);
513 green >>= (16 - info->var.green.length);
514 blue >>= (16 - info->var.blue.length);
515 value = (red << info->var.red.offset) |
516 (green << info->var.green.offset) |
517 (blue << info->var.blue.offset);
518 if (info->var.transp.length > 0) {
519 u32 mask = (1 << info->var.transp.length) - 1;
520 mask <<= info->var.transp.offset;
521 value |= mask;
522 }
523 palette[regno] = value;
524 return 0;
525 }
526
527 pindex = regno;
528
529 if (fb->bits_per_pixel == 16) {
530 pindex = regno << 3;
531
532 if (fb->depth == 16 && regno > 63)
533 return -EINVAL;
534 if (fb->depth == 15 && regno > 31)
535 return -EINVAL;
536
537 if (fb->depth == 16) {
538 u16 r, g, b;
539 int i;
540 if (regno < 32) {
541 for (i = 0; i < 8; i++)
542 fb_helper->funcs->gamma_set(crtc, red,
543 green, blue, pindex + i);
544 }
545
546 fb_helper->funcs->gamma_get(crtc, &r,
547 &g, &b,
548 pindex >> 1);
549
550 for (i = 0; i < 4; i++)
551 fb_helper->funcs->gamma_set(crtc, r,
552 green, b,
553 (pindex >> 1) + i);
554 }
555 }
556
557 if (fb->depth != 16)
558 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
559 return 0;
560}
561
562int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
563{
564 struct drm_fb_helper *fb_helper = info->par;
565 struct drm_crtc_helper_funcs *crtc_funcs;
566 u16 *red, *green, *blue, *transp;
567 struct drm_crtc *crtc;
568 int i, j, rc = 0;
569 int start;
570
571 for (i = 0; i < fb_helper->crtc_count; i++) {
572 crtc = fb_helper->crtc_info[i].mode_set.crtc;
573 crtc_funcs = crtc->helper_private;
574
575 red = cmap->red;
576 green = cmap->green;
577 blue = cmap->blue;
578 transp = cmap->transp;
579 start = cmap->start;
580
581 for (j = 0; j < cmap->len; j++) {
582 u16 hred, hgreen, hblue, htransp = 0xffff;
583
584 hred = *red++;
585 hgreen = *green++;
586 hblue = *blue++;
587
588 if (transp)
589 htransp = *transp++;
590
591 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
592 if (rc)
593 return rc;
594 }
595 crtc_funcs->load_lut(crtc);
596 }
597 return rc;
598}
599EXPORT_SYMBOL(drm_fb_helper_setcmap);
600
601int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
602 struct fb_info *info)
603{
604 struct drm_fb_helper *fb_helper = info->par;
605 struct drm_framebuffer *fb = fb_helper->fb;
606 int depth;
607
608 if (var->pixclock != 0 || in_dbg_master())
609 return -EINVAL;
610
611 /* Need to resize the fb object !!! */
612 if (var->bits_per_pixel > fb->bits_per_pixel || var->xres > fb->width || var->yres > fb->height) {
613 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
614 "object %dx%d-%d > %dx%d-%d\n", var->xres, var->yres, var->bits_per_pixel,
615 fb->width, fb->height, fb->bits_per_pixel);
616 return -EINVAL;
617 }
618
619 switch (var->bits_per_pixel) {
620 case 16:
621 depth = (var->green.length == 6) ? 16 : 15;
622 break;
623 case 32:
624 depth = (var->transp.length > 0) ? 32 : 24;
625 break;
626 default:
627 depth = var->bits_per_pixel;
628 break;
629 }
630
631 switch (depth) {
632 case 8:
633 var->red.offset = 0;
634 var->green.offset = 0;
635 var->blue.offset = 0;
636 var->red.length = 8;
637 var->green.length = 8;
638 var->blue.length = 8;
639 var->transp.length = 0;
640 var->transp.offset = 0;
641 break;
642 case 15:
643 var->red.offset = 10;
644 var->green.offset = 5;
645 var->blue.offset = 0;
646 var->red.length = 5;
647 var->green.length = 5;
648 var->blue.length = 5;
649 var->transp.length = 1;
650 var->transp.offset = 15;
651 break;
652 case 16:
653 var->red.offset = 11;
654 var->green.offset = 5;
655 var->blue.offset = 0;
656 var->red.length = 5;
657 var->green.length = 6;
658 var->blue.length = 5;
659 var->transp.length = 0;
660 var->transp.offset = 0;
661 break;
662 case 24:
663 var->red.offset = 16;
664 var->green.offset = 8;
665 var->blue.offset = 0;
666 var->red.length = 8;
667 var->green.length = 8;
668 var->blue.length = 8;
669 var->transp.length = 0;
670 var->transp.offset = 0;
671 break;
672 case 32:
673 var->red.offset = 16;
674 var->green.offset = 8;
675 var->blue.offset = 0;
676 var->red.length = 8;
677 var->green.length = 8;
678 var->blue.length = 8;
679 var->transp.length = 8;
680 var->transp.offset = 24;
681 break;
682 default:
683 return -EINVAL;
684 }
685 return 0;
686}
687EXPORT_SYMBOL(drm_fb_helper_check_var);
688
689/* this will let fbcon do the mode init */
690int drm_fb_helper_set_par(struct fb_info *info)
691{
692 struct drm_fb_helper *fb_helper = info->par;
693 struct drm_device *dev = fb_helper->dev;
694 struct fb_var_screeninfo *var = &info->var;
695 struct drm_crtc *crtc;
696 int ret;
697 int i;
698
699 if (var->pixclock != 0) {
700 DRM_ERROR("PIXEL CLOCK SET\n");
701 return -EINVAL;
702 }
703
704 mutex_lock(&dev->mode_config.mutex);
705 for (i = 0; i < fb_helper->crtc_count; i++) {
706 crtc = fb_helper->crtc_info[i].mode_set.crtc;
707 ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
708 if (ret) {
709 mutex_unlock(&dev->mode_config.mutex);
710 return ret;
711 }
712 }
713 mutex_unlock(&dev->mode_config.mutex);
714
715 if (fb_helper->delayed_hotplug) {
716 fb_helper->delayed_hotplug = false;
717 drm_fb_helper_hotplug_event(fb_helper);
718 }
719 return 0;
720}
721EXPORT_SYMBOL(drm_fb_helper_set_par);
722
723int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
724 struct fb_info *info)
725{
726 struct drm_fb_helper *fb_helper = info->par;
727 struct drm_device *dev = fb_helper->dev;
728 struct drm_mode_set *modeset;
729 struct drm_crtc *crtc;
730 int ret = 0;
731 int i;
732
733 mutex_lock(&dev->mode_config.mutex);
734 for (i = 0; i < fb_helper->crtc_count; i++) {
735 crtc = fb_helper->crtc_info[i].mode_set.crtc;
736
737 modeset = &fb_helper->crtc_info[i].mode_set;
738
739 modeset->x = var->xoffset;
740 modeset->y = var->yoffset;
741
742 if (modeset->num_connectors) {
743 ret = crtc->funcs->set_config(modeset);
744 if (!ret) {
745 info->var.xoffset = var->xoffset;
746 info->var.yoffset = var->yoffset;
747 }
748 }
749 }
750 mutex_unlock(&dev->mode_config.mutex);
751 return ret;
752}
753EXPORT_SYMBOL(drm_fb_helper_pan_display);
754
755int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
756 int preferred_bpp)
757{
758 int new_fb = 0;
759 int crtc_count = 0;
760 int i;
761 struct fb_info *info;
762 struct drm_fb_helper_surface_size sizes;
763 int gamma_size = 0;
764
765 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
766 sizes.surface_depth = 24;
767 sizes.surface_bpp = 32;
768 sizes.fb_width = (unsigned)-1;
769 sizes.fb_height = (unsigned)-1;
770
771 /* if driver picks 8 or 16 by default use that
772 for both depth/bpp */
773 if (preferred_bpp != sizes.surface_bpp) {
774 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
775 }
776 /* first up get a count of crtcs now in use and new min/maxes width/heights */
777 for (i = 0; i < fb_helper->connector_count; i++) {
778 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
779 struct drm_cmdline_mode *cmdline_mode;
780
781 cmdline_mode = &fb_helper_conn->cmdline_mode;
782
783 if (cmdline_mode->bpp_specified) {
784 switch (cmdline_mode->bpp) {
785 case 8:
786 sizes.surface_depth = sizes.surface_bpp = 8;
787 break;
788 case 15:
789 sizes.surface_depth = 15;
790 sizes.surface_bpp = 16;
791 break;
792 case 16:
793 sizes.surface_depth = sizes.surface_bpp = 16;
794 break;
795 case 24:
796 sizes.surface_depth = sizes.surface_bpp = 24;
797 break;
798 case 32:
799 sizes.surface_depth = 24;
800 sizes.surface_bpp = 32;
801 break;
802 }
803 break;
804 }
805 }
806
807 crtc_count = 0;
808 for (i = 0; i < fb_helper->crtc_count; i++) {
809 struct drm_display_mode *desired_mode;
810 desired_mode = fb_helper->crtc_info[i].desired_mode;
811
812 if (desired_mode) {
813 if (gamma_size == 0)
814 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
815 if (desired_mode->hdisplay < sizes.fb_width)
816 sizes.fb_width = desired_mode->hdisplay;
817 if (desired_mode->vdisplay < sizes.fb_height)
818 sizes.fb_height = desired_mode->vdisplay;
819 if (desired_mode->hdisplay > sizes.surface_width)
820 sizes.surface_width = desired_mode->hdisplay;
821 if (desired_mode->vdisplay > sizes.surface_height)
822 sizes.surface_height = desired_mode->vdisplay;
823 crtc_count++;
824 }
825 }
826
827 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
828 /* hmm everyone went away - assume VGA cable just fell out
829 and will come back later. */
830 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
831 sizes.fb_width = sizes.surface_width = 1024;
832 sizes.fb_height = sizes.surface_height = 768;
833 }
834
835 /* push down into drivers */
836 new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
837 if (new_fb < 0)
838 return new_fb;
839
840 info = fb_helper->fbdev;
841
842 /* set the fb pointer */
843 for (i = 0; i < fb_helper->crtc_count; i++) {
844 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
845 }
846
847 if (new_fb) {
848 info->var.pixclock = 0;
849 if (register_framebuffer(info) < 0) {
850 return -EINVAL;
851 }
852
853 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
854 info->fix.id);
855
856 } else {
857 drm_fb_helper_set_par(info);
858 }
859
860 /* Switch back to kernel console on panic */
861 /* multi card linked list maybe */
862 if (list_empty(&kernel_fb_helper_list)) {
863 printk(KERN_INFO "drm: registered panic notifier\n");
864 atomic_notifier_chain_register(&panic_notifier_list,
865 &paniced);
866 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
867 }
868 if (new_fb)
869 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
870
871 return 0;
872}
873EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
874
875void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
876 uint32_t depth)
877{
878 info->fix.type = FB_TYPE_PACKED_PIXELS;
879 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
880 FB_VISUAL_TRUECOLOR;
881 info->fix.mmio_start = 0;
882 info->fix.mmio_len = 0;
883 info->fix.type_aux = 0;
884 info->fix.xpanstep = 1; /* doing it in hw */
885 info->fix.ypanstep = 1; /* doing it in hw */
886 info->fix.ywrapstep = 0;
887 info->fix.accel = FB_ACCEL_NONE;
888 info->fix.type_aux = 0;
889
890 info->fix.line_length = pitch;
891 return;
892}
893EXPORT_SYMBOL(drm_fb_helper_fill_fix);
894
895void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
896 uint32_t fb_width, uint32_t fb_height)
897{
898 struct drm_framebuffer *fb = fb_helper->fb;
899 info->pseudo_palette = fb_helper->pseudo_palette;
900 info->var.xres_virtual = fb->width;
901 info->var.yres_virtual = fb->height;
902 info->var.bits_per_pixel = fb->bits_per_pixel;
903 info->var.accel_flags = FB_ACCELF_TEXT;
904 info->var.xoffset = 0;
905 info->var.yoffset = 0;
906 info->var.activate = FB_ACTIVATE_NOW;
907 info->var.height = -1;
908 info->var.width = -1;
909
910 switch (fb->depth) {
911 case 8:
912 info->var.red.offset = 0;
913 info->var.green.offset = 0;
914 info->var.blue.offset = 0;
915 info->var.red.length = 8; /* 8bit DAC */
916 info->var.green.length = 8;
917 info->var.blue.length = 8;
918 info->var.transp.offset = 0;
919 info->var.transp.length = 0;
920 break;
921 case 15:
922 info->var.red.offset = 10;
923 info->var.green.offset = 5;
924 info->var.blue.offset = 0;
925 info->var.red.length = 5;
926 info->var.green.length = 5;
927 info->var.blue.length = 5;
928 info->var.transp.offset = 15;
929 info->var.transp.length = 1;
930 break;
931 case 16:
932 info->var.red.offset = 11;
933 info->var.green.offset = 5;
934 info->var.blue.offset = 0;
935 info->var.red.length = 5;
936 info->var.green.length = 6;
937 info->var.blue.length = 5;
938 info->var.transp.offset = 0;
939 break;
940 case 24:
941 info->var.red.offset = 16;
942 info->var.green.offset = 8;
943 info->var.blue.offset = 0;
944 info->var.red.length = 8;
945 info->var.green.length = 8;
946 info->var.blue.length = 8;
947 info->var.transp.offset = 0;
948 info->var.transp.length = 0;
949 break;
950 case 32:
951 info->var.red.offset = 16;
952 info->var.green.offset = 8;
953 info->var.blue.offset = 0;
954 info->var.red.length = 8;
955 info->var.green.length = 8;
956 info->var.blue.length = 8;
957 info->var.transp.offset = 24;
958 info->var.transp.length = 8;
959 break;
960 default:
961 break;
962 }
963
964 info->var.xres = fb_width;
965 info->var.yres = fb_height;
966}
967EXPORT_SYMBOL(drm_fb_helper_fill_var);
968
969static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
970 uint32_t maxX,
971 uint32_t maxY)
972{
973 struct drm_connector *connector;
974 int count = 0;
975 int i;
976
977 for (i = 0; i < fb_helper->connector_count; i++) {
978 connector = fb_helper->connector_info[i]->connector;
979 count += connector->funcs->fill_modes(connector, maxX, maxY);
980 }
981
982 return count;
983}
984
985static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
986{
987 struct drm_display_mode *mode;
988
989 list_for_each_entry(mode, &fb_connector->connector->modes, head) {
990 if (drm_mode_width(mode) > width ||
991 drm_mode_height(mode) > height)
992 continue;
993 if (mode->type & DRM_MODE_TYPE_PREFERRED)
994 return mode;
995 }
996 return NULL;
997}
998
999static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1000{
1001 struct drm_cmdline_mode *cmdline_mode;
1002 cmdline_mode = &fb_connector->cmdline_mode;
1003 return cmdline_mode->specified;
1004}
1005
1006static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1007 int width, int height)
1008{
1009 struct drm_cmdline_mode *cmdline_mode;
1010 struct drm_display_mode *mode = NULL;
1011
1012 cmdline_mode = &fb_helper_conn->cmdline_mode;
1013 if (cmdline_mode->specified == false)
1014 return mode;
1015
1016 /* attempt to find a matching mode in the list of modes
1017 * we have gotten so far, if not add a CVT mode that conforms
1018 */
1019 if (cmdline_mode->rb || cmdline_mode->margins)
1020 goto create_mode;
1021
1022 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1023 /* check width/height */
1024 if (mode->hdisplay != cmdline_mode->xres ||
1025 mode->vdisplay != cmdline_mode->yres)
1026 continue;
1027
1028 if (cmdline_mode->refresh_specified) {
1029 if (mode->vrefresh != cmdline_mode->refresh)
1030 continue;
1031 }
1032
1033 if (cmdline_mode->interlace) {
1034 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1035 continue;
1036 }
1037 return mode;
1038 }
1039
1040create_mode:
1041 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1042 cmdline_mode);
1043 list_add(&mode->head, &fb_helper_conn->connector->modes);
1044 return mode;
1045}
1046
1047static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1048{
1049 bool enable;
1050
1051 if (strict) {
1052 enable = connector->status == connector_status_connected;
1053 } else {
1054 enable = connector->status != connector_status_disconnected;
1055 }
1056 return enable;
1057}
1058
1059static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1060 bool *enabled)
1061{
1062 bool any_enabled = false;
1063 struct drm_connector *connector;
1064 int i = 0;
1065
1066 for (i = 0; i < fb_helper->connector_count; i++) {
1067 connector = fb_helper->connector_info[i]->connector;
1068 enabled[i] = drm_connector_enabled(connector, true);
1069 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1070 enabled[i] ? "yes" : "no");
1071 any_enabled |= enabled[i];
1072 }
1073
1074 if (any_enabled)
1075 return;
1076
1077 for (i = 0; i < fb_helper->connector_count; i++) {
1078 connector = fb_helper->connector_info[i]->connector;
1079 enabled[i] = drm_connector_enabled(connector, false);
1080 }
1081}
1082
1083static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1084 struct drm_display_mode **modes,
1085 bool *enabled, int width, int height)
1086{
1087 int count, i, j;
1088 bool can_clone = false;
1089 struct drm_fb_helper_connector *fb_helper_conn;
1090 struct drm_display_mode *dmt_mode, *mode;
1091
1092 /* only contemplate cloning in the single crtc case */
1093 if (fb_helper->crtc_count > 1)
1094 return false;
1095
1096 count = 0;
1097 for (i = 0; i < fb_helper->connector_count; i++) {
1098 if (enabled[i])
1099 count++;
1100 }
1101
1102 /* only contemplate cloning if more than one connector is enabled */
1103 if (count <= 1)
1104 return false;
1105
1106 /* check the command line or if nothing common pick 1024x768 */
1107 can_clone = true;
1108 for (i = 0; i < fb_helper->connector_count; i++) {
1109 if (!enabled[i])
1110 continue;
1111 fb_helper_conn = fb_helper->connector_info[i];
1112 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1113 if (!modes[i]) {
1114 can_clone = false;
1115 break;
1116 }
1117 for (j = 0; j < i; j++) {
1118 if (!enabled[j])
1119 continue;
1120 if (!drm_mode_equal(modes[j], modes[i]))
1121 can_clone = false;
1122 }
1123 }
1124
1125 if (can_clone) {
1126 DRM_DEBUG_KMS("can clone using command line\n");
1127 return true;
1128 }
1129
1130 /* try and find a 1024x768 mode on each connector */
1131 can_clone = true;
1132 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60);
1133
1134 for (i = 0; i < fb_helper->connector_count; i++) {
1135
1136 if (!enabled[i])
1137 continue;
1138
1139 fb_helper_conn = fb_helper->connector_info[i];
1140 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1141 if (drm_mode_equal(mode, dmt_mode))
1142 modes[i] = mode;
1143 }
1144 if (!modes[i])
1145 can_clone = false;
1146 }
1147
1148 if (can_clone) {
1149 DRM_DEBUG_KMS("can clone using 1024x768\n");
1150 return true;
1151 }
1152 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1153 return false;
1154}
1155
1156static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1157 struct drm_display_mode **modes,
1158 bool *enabled, int width, int height)
1159{
1160 struct drm_fb_helper_connector *fb_helper_conn;
1161 int i;
1162
1163 for (i = 0; i < fb_helper->connector_count; i++) {
1164 fb_helper_conn = fb_helper->connector_info[i];
1165
1166 if (enabled[i] == false)
1167 continue;
1168
1169 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1170 fb_helper_conn->connector->base.id);
1171
1172 /* got for command line mode first */
1173 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1174 if (!modes[i]) {
1175 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1176 fb_helper_conn->connector->base.id);
1177 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1178 }
1179 /* No preferred modes, pick one off the list */
1180 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1181 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1182 break;
1183 }
1184 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1185 "none");
1186 }
1187 return true;
1188}
1189
1190static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1191 struct drm_fb_helper_crtc **best_crtcs,
1192 struct drm_display_mode **modes,
1193 int n, int width, int height)
1194{
1195 int c, o;
1196 struct drm_device *dev = fb_helper->dev;
1197 struct drm_connector *connector;
1198 struct drm_connector_helper_funcs *connector_funcs;
1199 struct drm_encoder *encoder;
1200 struct drm_fb_helper_crtc *best_crtc;
1201 int my_score, best_score, score;
1202 struct drm_fb_helper_crtc **crtcs, *crtc;
1203 struct drm_fb_helper_connector *fb_helper_conn;
1204
1205 if (n == fb_helper->connector_count)
1206 return 0;
1207
1208 fb_helper_conn = fb_helper->connector_info[n];
1209 connector = fb_helper_conn->connector;
1210
1211 best_crtcs[n] = NULL;
1212 best_crtc = NULL;
1213 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1214 if (modes[n] == NULL)
1215 return best_score;
1216
1217 crtcs = kzalloc(dev->mode_config.num_connector *
1218 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1219 if (!crtcs)
1220 return best_score;
1221
1222 my_score = 1;
1223 if (connector->status == connector_status_connected)
1224 my_score++;
1225 if (drm_has_cmdline_mode(fb_helper_conn))
1226 my_score++;
1227 if (drm_has_preferred_mode(fb_helper_conn, width, height))
1228 my_score++;
1229
1230 connector_funcs = connector->helper_private;
1231 encoder = connector_funcs->best_encoder(connector);
1232 if (!encoder)
1233 goto out;
1234
1235 /* select a crtc for this connector and then attempt to configure
1236 remaining connectors */
1237 for (c = 0; c < fb_helper->crtc_count; c++) {
1238 crtc = &fb_helper->crtc_info[c];
1239
1240 if ((encoder->possible_crtcs & (1 << c)) == 0) {
1241 continue;
1242 }
1243
1244 for (o = 0; o < n; o++)
1245 if (best_crtcs[o] == crtc)
1246 break;
1247
1248 if (o < n) {
1249 /* ignore cloning unless only a single crtc */
1250 if (fb_helper->crtc_count > 1)
1251 continue;
1252
1253 if (!drm_mode_equal(modes[o], modes[n]))
1254 continue;
1255 }
1256
1257 crtcs[n] = crtc;
1258 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1259 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1260 width, height);
1261 if (score > best_score) {
1262 best_crtc = crtc;
1263 best_score = score;
1264 memcpy(best_crtcs, crtcs,
1265 dev->mode_config.num_connector *
1266 sizeof(struct drm_fb_helper_crtc *));
1267 }
1268 }
1269out:
1270 kfree(crtcs);
1271 return best_score;
1272}
1273
1274static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1275{
1276 struct drm_device *dev = fb_helper->dev;
1277 struct drm_fb_helper_crtc **crtcs;
1278 struct drm_display_mode **modes;
1279 struct drm_encoder *encoder;
1280 struct drm_mode_set *modeset;
1281 bool *enabled;
1282 int width, height;
1283 int i, ret;
1284
1285 DRM_DEBUG_KMS("\n");
1286
1287 width = dev->mode_config.max_width;
1288 height = dev->mode_config.max_height;
1289
1290 /* clean out all the encoder/crtc combos */
1291 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1292 encoder->crtc = NULL;
1293 }
1294
1295 crtcs = kcalloc(dev->mode_config.num_connector,
1296 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1297 modes = kcalloc(dev->mode_config.num_connector,
1298 sizeof(struct drm_display_mode *), GFP_KERNEL);
1299 enabled = kcalloc(dev->mode_config.num_connector,
1300 sizeof(bool), GFP_KERNEL);
1301
1302 drm_enable_connectors(fb_helper, enabled);
1303
1304 ret = drm_target_cloned(fb_helper, modes, enabled, width, height);
1305 if (!ret) {
1306 ret = drm_target_preferred(fb_helper, modes, enabled, width, height);
1307 if (!ret)
1308 DRM_ERROR("Unable to find initial modes\n");
1309 }
1310
1311 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
1312
1313 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1314
1315 /* need to set the modesets up here for use later */
1316 /* fill out the connector<->crtc mappings into the modesets */
1317 for (i = 0; i < fb_helper->crtc_count; i++) {
1318 modeset = &fb_helper->crtc_info[i].mode_set;
1319 modeset->num_connectors = 0;
1320 }
1321
1322 for (i = 0; i < fb_helper->connector_count; i++) {
1323 struct drm_display_mode *mode = modes[i];
1324 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1325 modeset = &fb_crtc->mode_set;
1326
1327 if (mode && fb_crtc) {
1328 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1329 mode->name, fb_crtc->mode_set.crtc->base.id);
1330 fb_crtc->desired_mode = mode;
1331 if (modeset->mode)
1332 drm_mode_destroy(dev, modeset->mode);
1333 modeset->mode = drm_mode_duplicate(dev,
1334 fb_crtc->desired_mode);
1335 modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1336 }
1337 }
1338
1339 kfree(crtcs);
1340 kfree(modes);
1341 kfree(enabled);
1342}
1343
1344/**
1345 * drm_helper_initial_config - setup a sane initial connector configuration
1346 * @dev: DRM device
1347 *
1348 * LOCKING:
1349 * Called at init time, must take mode config lock.
1350 *
1351 * Scan the CRTCs and connectors and try to put together an initial setup.
1352 * At the moment, this is a cloned configuration across all heads with
1353 * a new framebuffer object as the backing store.
1354 *
1355 * RETURNS:
1356 * Zero if everything went ok, nonzero otherwise.
1357 */
1358bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1359{
1360 struct drm_device *dev = fb_helper->dev;
1361 int count = 0;
1362
1363 /* disable all the possible outputs/crtcs before entering KMS mode */
1364 drm_helper_disable_unused_functions(fb_helper->dev);
1365
1366 drm_fb_helper_parse_command_line(fb_helper);
1367
1368 count = drm_fb_helper_probe_connector_modes(fb_helper,
1369 dev->mode_config.max_width,
1370 dev->mode_config.max_height);
1371 /*
1372 * we shouldn't end up with no modes here.
1373 */
1374 if (count == 0) {
1375 printk(KERN_INFO "No connectors reported connected with modes\n");
1376 }
1377 drm_setup_crtcs(fb_helper);
1378
1379 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1380}
1381EXPORT_SYMBOL(drm_fb_helper_initial_config);
1382
1383/**
1384 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1385 * probing all the outputs attached to the fb.
1386 * @fb_helper: the drm_fb_helper
1387 *
1388 * LOCKING:
1389 * Called at runtime, must take mode config lock.
1390 *
1391 * Scan the connectors attached to the fb_helper and try to put together a
1392 * setup after *notification of a change in output configuration.
1393 *
1394 * RETURNS:
1395 * 0 on success and a non-zero error code otherwise.
1396 */
1397int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1398{
1399 struct drm_device *dev = fb_helper->dev;
1400 int count = 0;
1401 u32 max_width, max_height, bpp_sel;
1402 bool bound = false, crtcs_bound = false;
1403 struct drm_crtc *crtc;
1404
1405 if (!fb_helper->fb)
1406 return 0;
1407
1408 mutex_lock(&dev->mode_config.mutex);
1409 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
1410 if (crtc->fb)
1411 crtcs_bound = true;
1412 if (crtc->fb == fb_helper->fb)
1413 bound = true;
1414 }
1415
1416 if (!bound && crtcs_bound) {
1417 fb_helper->delayed_hotplug = true;
1418 mutex_unlock(&dev->mode_config.mutex);
1419 return 0;
1420 }
1421 DRM_DEBUG_KMS("\n");
1422
1423 max_width = fb_helper->fb->width;
1424 max_height = fb_helper->fb->height;
1425 bpp_sel = fb_helper->fb->bits_per_pixel;
1426
1427 count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
1428 max_height);
1429 drm_setup_crtcs(fb_helper);
1430 mutex_unlock(&dev->mode_config.mutex);
1431
1432 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1433}
1434EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1435
1436/* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1437 * but the module doesn't depend on any fb console symbols. At least
1438 * attempt to load fbcon to avoid leaving the system without a usable console.
1439 */
1440#if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1441static int __init drm_fb_helper_modinit(void)
1442{
1443 const char *name = "fbcon";
1444 struct module *fbcon;
1445
1446 mutex_lock(&module_mutex);
1447 fbcon = find_module(name);
1448 mutex_unlock(&module_mutex);
1449
1450 if (!fbcon)
1451 request_module_nowait(name);
1452 return 0;
1453}
1454
1455module_init(drm_fb_helper_modinit);
1456#endif
1/*
2 * Copyright (c) 2006-2009 Red Hat Inc.
3 * Copyright (c) 2006-2008 Intel Corporation
4 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
5 *
6 * DRM framebuffer helper functions
7 *
8 * Permission to use, copy, modify, distribute, and sell this software and its
9 * documentation for any purpose is hereby granted without fee, provided that
10 * the above copyright notice appear in all copies and that both that copyright
11 * notice and this permission notice appear in supporting documentation, and
12 * that the name of the copyright holders not be used in advertising or
13 * publicity pertaining to distribution of the software without specific,
14 * written prior permission. The copyright holders make no representations
15 * about the suitability of this software for any purpose. It is provided "as
16 * is" without express or implied warranty.
17 *
18 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
19 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
20 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
21 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
22 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
23 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
24 * OF THIS SOFTWARE.
25 *
26 * Authors:
27 * Dave Airlie <airlied@linux.ie>
28 * Jesse Barnes <jesse.barnes@intel.com>
29 */
30#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
31
32#include <linux/console.h>
33#include <linux/pci.h>
34#include <linux/sysrq.h>
35#include <linux/vga_switcheroo.h>
36
37#include <drm/drm_atomic.h>
38#include <drm/drm_drv.h>
39#include <drm/drm_fb_helper.h>
40#include <drm/drm_fourcc.h>
41#include <drm/drm_framebuffer.h>
42#include <drm/drm_modeset_helper_vtables.h>
43#include <drm/drm_print.h>
44#include <drm/drm_vblank.h>
45
46#include "drm_internal.h"
47
48static bool drm_fbdev_emulation = true;
49module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600);
50MODULE_PARM_DESC(fbdev_emulation,
51 "Enable legacy fbdev emulation [default=true]");
52
53static int drm_fbdev_overalloc = CONFIG_DRM_FBDEV_OVERALLOC;
54module_param(drm_fbdev_overalloc, int, 0444);
55MODULE_PARM_DESC(drm_fbdev_overalloc,
56 "Overallocation of the fbdev buffer (%) [default="
57 __MODULE_STRING(CONFIG_DRM_FBDEV_OVERALLOC) "]");
58
59/*
60 * In order to keep user-space compatibility, we want in certain use-cases
61 * to keep leaking the fbdev physical address to the user-space program
62 * handling the fbdev buffer.
63 * This is a bad habit essentially kept into closed source opengl driver
64 * that should really be moved into open-source upstream projects instead
65 * of using legacy physical addresses in user space to communicate with
66 * other out-of-tree kernel modules.
67 *
68 * This module_param *should* be removed as soon as possible and be
69 * considered as a broken and legacy behaviour from a modern fbdev device.
70 */
71#if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM)
72static bool drm_leak_fbdev_smem;
73module_param_unsafe(drm_leak_fbdev_smem, bool, 0600);
74MODULE_PARM_DESC(drm_leak_fbdev_smem,
75 "Allow unsafe leaking fbdev physical smem address [default=false]");
76#endif
77
78static LIST_HEAD(kernel_fb_helper_list);
79static DEFINE_MUTEX(kernel_fb_helper_lock);
80
81/**
82 * DOC: fbdev helpers
83 *
84 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
85 * mode setting driver. They can be used mostly independently from the crtc
86 * helper functions used by many drivers to implement the kernel mode setting
87 * interfaces.
88 *
89 * Drivers that support a dumb buffer with a virtual address and mmap support,
90 * should try out the generic fbdev emulation using drm_fbdev_generic_setup().
91 * It will automatically set up deferred I/O if the driver requires a shadow
92 * buffer.
93 *
94 * Existing fbdev implementations should restore the fbdev console by using
95 * drm_fb_helper_lastclose() as their &drm_driver.lastclose callback.
96 * They should also notify the fb helper code from updates to the output
97 * configuration by using drm_fb_helper_output_poll_changed() as their
98 * &drm_mode_config_funcs.output_poll_changed callback. New implementations
99 * of fbdev should be build on top of struct &drm_client_funcs, which handles
100 * this automatically. Setting the old callbacks should be avoided.
101 *
102 * For suspend/resume consider using drm_mode_config_helper_suspend() and
103 * drm_mode_config_helper_resume() which takes care of fbdev as well.
104 *
105 * All other functions exported by the fb helper library can be used to
106 * implement the fbdev driver interface by the driver.
107 *
108 * It is possible, though perhaps somewhat tricky, to implement race-free
109 * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
110 * helper must be called first to initialize the minimum required to make
111 * hotplug detection work. Drivers also need to make sure to properly set up
112 * the &drm_mode_config.funcs member. After calling drm_kms_helper_poll_init()
113 * it is safe to enable interrupts and start processing hotplug events. At the
114 * same time, drivers should initialize all modeset objects such as CRTCs,
115 * encoders and connectors. To finish up the fbdev helper initialization, the
116 * drm_fb_helper_init() function is called. To probe for all attached displays
117 * and set up an initial configuration using the detected hardware, drivers
118 * should call drm_fb_helper_initial_config().
119 *
120 * If &drm_framebuffer_funcs.dirty is set, the
121 * drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will
122 * accumulate changes and schedule &drm_fb_helper.dirty_work to run right
123 * away. This worker then calls the dirty() function ensuring that it will
124 * always run in process context since the fb_*() function could be running in
125 * atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io
126 * callback it will also schedule dirty_work with the damage collected from the
127 * mmap page writes.
128 *
129 * Deferred I/O is not compatible with SHMEM. Such drivers should request an
130 * fbdev shadow buffer and call drm_fbdev_generic_setup() instead.
131 */
132
133static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
134{
135 uint16_t *r_base, *g_base, *b_base;
136
137 if (crtc->funcs->gamma_set == NULL)
138 return;
139
140 r_base = crtc->gamma_store;
141 g_base = r_base + crtc->gamma_size;
142 b_base = g_base + crtc->gamma_size;
143
144 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base,
145 crtc->gamma_size, NULL);
146}
147
148/**
149 * drm_fb_helper_debug_enter - implementation for &fb_ops.fb_debug_enter
150 * @info: fbdev registered by the helper
151 */
152int drm_fb_helper_debug_enter(struct fb_info *info)
153{
154 struct drm_fb_helper *helper = info->par;
155 const struct drm_crtc_helper_funcs *funcs;
156 struct drm_mode_set *mode_set;
157
158 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
159 mutex_lock(&helper->client.modeset_mutex);
160 drm_client_for_each_modeset(mode_set, &helper->client) {
161 if (!mode_set->crtc->enabled)
162 continue;
163
164 funcs = mode_set->crtc->helper_private;
165 if (funcs->mode_set_base_atomic == NULL)
166 continue;
167
168 if (drm_drv_uses_atomic_modeset(mode_set->crtc->dev))
169 continue;
170
171 funcs->mode_set_base_atomic(mode_set->crtc,
172 mode_set->fb,
173 mode_set->x,
174 mode_set->y,
175 ENTER_ATOMIC_MODE_SET);
176 }
177 mutex_unlock(&helper->client.modeset_mutex);
178 }
179
180 return 0;
181}
182EXPORT_SYMBOL(drm_fb_helper_debug_enter);
183
184/**
185 * drm_fb_helper_debug_leave - implementation for &fb_ops.fb_debug_leave
186 * @info: fbdev registered by the helper
187 */
188int drm_fb_helper_debug_leave(struct fb_info *info)
189{
190 struct drm_fb_helper *helper = info->par;
191 struct drm_client_dev *client = &helper->client;
192 struct drm_device *dev = helper->dev;
193 struct drm_crtc *crtc;
194 const struct drm_crtc_helper_funcs *funcs;
195 struct drm_mode_set *mode_set;
196 struct drm_framebuffer *fb;
197
198 mutex_lock(&client->modeset_mutex);
199 drm_client_for_each_modeset(mode_set, client) {
200 crtc = mode_set->crtc;
201 if (drm_drv_uses_atomic_modeset(crtc->dev))
202 continue;
203
204 funcs = crtc->helper_private;
205 fb = crtc->primary->fb;
206
207 if (!crtc->enabled)
208 continue;
209
210 if (!fb) {
211 drm_err(dev, "no fb to restore?\n");
212 continue;
213 }
214
215 if (funcs->mode_set_base_atomic == NULL)
216 continue;
217
218 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
219 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
220 crtc->y, LEAVE_ATOMIC_MODE_SET);
221 }
222 mutex_unlock(&client->modeset_mutex);
223
224 return 0;
225}
226EXPORT_SYMBOL(drm_fb_helper_debug_leave);
227
228static int
229__drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper,
230 bool force)
231{
232 bool do_delayed;
233 int ret;
234
235 if (!drm_fbdev_emulation || !fb_helper)
236 return -ENODEV;
237
238 if (READ_ONCE(fb_helper->deferred_setup))
239 return 0;
240
241 mutex_lock(&fb_helper->lock);
242 if (force) {
243 /*
244 * Yes this is the _locked version which expects the master lock
245 * to be held. But for forced restores we're intentionally
246 * racing here, see drm_fb_helper_set_par().
247 */
248 ret = drm_client_modeset_commit_locked(&fb_helper->client);
249 } else {
250 ret = drm_client_modeset_commit(&fb_helper->client);
251 }
252
253 do_delayed = fb_helper->delayed_hotplug;
254 if (do_delayed)
255 fb_helper->delayed_hotplug = false;
256 mutex_unlock(&fb_helper->lock);
257
258 if (do_delayed)
259 drm_fb_helper_hotplug_event(fb_helper);
260
261 return ret;
262}
263
264/**
265 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
266 * @fb_helper: driver-allocated fbdev helper, can be NULL
267 *
268 * This should be called from driver's drm &drm_driver.lastclose callback
269 * when implementing an fbcon on top of kms using this helper. This ensures that
270 * the user isn't greeted with a black screen when e.g. X dies.
271 *
272 * RETURNS:
273 * Zero if everything went ok, negative error code otherwise.
274 */
275int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
276{
277 return __drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper, false);
278}
279EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
280
281#ifdef CONFIG_MAGIC_SYSRQ
282/* emergency restore, don't bother with error reporting */
283static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
284{
285 struct drm_fb_helper *helper;
286
287 mutex_lock(&kernel_fb_helper_lock);
288 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
289 struct drm_device *dev = helper->dev;
290
291 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
292 continue;
293
294 mutex_lock(&helper->lock);
295 drm_client_modeset_commit_locked(&helper->client);
296 mutex_unlock(&helper->lock);
297 }
298 mutex_unlock(&kernel_fb_helper_lock);
299}
300
301static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
302
303static void drm_fb_helper_sysrq(int dummy1)
304{
305 schedule_work(&drm_fb_helper_restore_work);
306}
307
308static const struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
309 .handler = drm_fb_helper_sysrq,
310 .help_msg = "force-fb(v)",
311 .action_msg = "Restore framebuffer console",
312};
313#else
314static const struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
315#endif
316
317static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
318{
319 struct drm_fb_helper *fb_helper = info->par;
320
321 mutex_lock(&fb_helper->lock);
322 drm_client_modeset_dpms(&fb_helper->client, dpms_mode);
323 mutex_unlock(&fb_helper->lock);
324}
325
326/**
327 * drm_fb_helper_blank - implementation for &fb_ops.fb_blank
328 * @blank: desired blanking state
329 * @info: fbdev registered by the helper
330 */
331int drm_fb_helper_blank(int blank, struct fb_info *info)
332{
333 if (oops_in_progress)
334 return -EBUSY;
335
336 switch (blank) {
337 /* Display: On; HSync: On, VSync: On */
338 case FB_BLANK_UNBLANK:
339 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
340 break;
341 /* Display: Off; HSync: On, VSync: On */
342 case FB_BLANK_NORMAL:
343 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
344 break;
345 /* Display: Off; HSync: Off, VSync: On */
346 case FB_BLANK_HSYNC_SUSPEND:
347 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
348 break;
349 /* Display: Off; HSync: On, VSync: Off */
350 case FB_BLANK_VSYNC_SUSPEND:
351 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
352 break;
353 /* Display: Off; HSync: Off, VSync: Off */
354 case FB_BLANK_POWERDOWN:
355 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
356 break;
357 }
358 return 0;
359}
360EXPORT_SYMBOL(drm_fb_helper_blank);
361
362static void drm_fb_helper_resume_worker(struct work_struct *work)
363{
364 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
365 resume_work);
366
367 console_lock();
368 fb_set_suspend(helper->info, 0);
369 console_unlock();
370}
371
372static void drm_fb_helper_fb_dirty(struct drm_fb_helper *helper)
373{
374 struct drm_device *dev = helper->dev;
375 struct drm_clip_rect *clip = &helper->damage_clip;
376 struct drm_clip_rect clip_copy;
377 unsigned long flags;
378 int ret;
379
380 if (drm_WARN_ON_ONCE(dev, !helper->funcs->fb_dirty))
381 return;
382
383 spin_lock_irqsave(&helper->damage_lock, flags);
384 clip_copy = *clip;
385 clip->x1 = clip->y1 = ~0;
386 clip->x2 = clip->y2 = 0;
387 spin_unlock_irqrestore(&helper->damage_lock, flags);
388
389 ret = helper->funcs->fb_dirty(helper, &clip_copy);
390 if (ret)
391 goto err;
392
393 return;
394
395err:
396 /*
397 * Restore damage clip rectangle on errors. The next run
398 * of the damage worker will perform the update.
399 */
400 spin_lock_irqsave(&helper->damage_lock, flags);
401 clip->x1 = min_t(u32, clip->x1, clip_copy.x1);
402 clip->y1 = min_t(u32, clip->y1, clip_copy.y1);
403 clip->x2 = max_t(u32, clip->x2, clip_copy.x2);
404 clip->y2 = max_t(u32, clip->y2, clip_copy.y2);
405 spin_unlock_irqrestore(&helper->damage_lock, flags);
406}
407
408static void drm_fb_helper_damage_work(struct work_struct *work)
409{
410 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper, damage_work);
411
412 drm_fb_helper_fb_dirty(helper);
413}
414
415/**
416 * drm_fb_helper_prepare - setup a drm_fb_helper structure
417 * @dev: DRM device
418 * @helper: driver-allocated fbdev helper structure to set up
419 * @funcs: pointer to structure of functions associate with this helper
420 *
421 * Sets up the bare minimum to make the framebuffer helper usable. This is
422 * useful to implement race-free initialization of the polling helpers.
423 */
424void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
425 const struct drm_fb_helper_funcs *funcs)
426{
427 INIT_LIST_HEAD(&helper->kernel_fb_list);
428 spin_lock_init(&helper->damage_lock);
429 INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker);
430 INIT_WORK(&helper->damage_work, drm_fb_helper_damage_work);
431 helper->damage_clip.x1 = helper->damage_clip.y1 = ~0;
432 mutex_init(&helper->lock);
433 helper->funcs = funcs;
434 helper->dev = dev;
435}
436EXPORT_SYMBOL(drm_fb_helper_prepare);
437
438/**
439 * drm_fb_helper_init - initialize a &struct drm_fb_helper
440 * @dev: drm device
441 * @fb_helper: driver-allocated fbdev helper structure to initialize
442 *
443 * This allocates the structures for the fbdev helper with the given limits.
444 * Note that this won't yet touch the hardware (through the driver interfaces)
445 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
446 * to allow driver writes more control over the exact init sequence.
447 *
448 * Drivers must call drm_fb_helper_prepare() before calling this function.
449 *
450 * RETURNS:
451 * Zero if everything went ok, nonzero otherwise.
452 */
453int drm_fb_helper_init(struct drm_device *dev,
454 struct drm_fb_helper *fb_helper)
455{
456 int ret;
457
458 /*
459 * If this is not the generic fbdev client, initialize a drm_client
460 * without callbacks so we can use the modesets.
461 */
462 if (!fb_helper->client.funcs) {
463 ret = drm_client_init(dev, &fb_helper->client, "drm_fb_helper", NULL);
464 if (ret)
465 return ret;
466 }
467
468 dev->fb_helper = fb_helper;
469
470 return 0;
471}
472EXPORT_SYMBOL(drm_fb_helper_init);
473
474/**
475 * drm_fb_helper_alloc_info - allocate fb_info and some of its members
476 * @fb_helper: driver-allocated fbdev helper
477 *
478 * A helper to alloc fb_info and the members cmap and apertures. Called
479 * by the driver within the fb_probe fb_helper callback function. Drivers do not
480 * need to release the allocated fb_info structure themselves, this is
481 * automatically done when calling drm_fb_helper_fini().
482 *
483 * RETURNS:
484 * fb_info pointer if things went okay, pointer containing error code
485 * otherwise
486 */
487struct fb_info *drm_fb_helper_alloc_info(struct drm_fb_helper *fb_helper)
488{
489 struct device *dev = fb_helper->dev->dev;
490 struct fb_info *info;
491 int ret;
492
493 info = framebuffer_alloc(0, dev);
494 if (!info)
495 return ERR_PTR(-ENOMEM);
496
497 ret = fb_alloc_cmap(&info->cmap, 256, 0);
498 if (ret)
499 goto err_release;
500
501 /*
502 * TODO: We really should be smarter here and alloc an aperture
503 * for each IORESOURCE_MEM resource helper->dev->dev has and also
504 * init the ranges of the appertures based on the resources.
505 * Note some drivers currently count on there being only 1 empty
506 * aperture and fill this themselves, these will need to be dealt
507 * with somehow when fixing this.
508 */
509 info->apertures = alloc_apertures(1);
510 if (!info->apertures) {
511 ret = -ENOMEM;
512 goto err_free_cmap;
513 }
514
515 fb_helper->info = info;
516 info->skip_vt_switch = true;
517
518 return info;
519
520err_free_cmap:
521 fb_dealloc_cmap(&info->cmap);
522err_release:
523 framebuffer_release(info);
524 return ERR_PTR(ret);
525}
526EXPORT_SYMBOL(drm_fb_helper_alloc_info);
527
528/**
529 * drm_fb_helper_unregister_info - unregister fb_info framebuffer device
530 * @fb_helper: driver-allocated fbdev helper, can be NULL
531 *
532 * A wrapper around unregister_framebuffer, to release the fb_info
533 * framebuffer device. This must be called before releasing all resources for
534 * @fb_helper by calling drm_fb_helper_fini().
535 */
536void drm_fb_helper_unregister_info(struct drm_fb_helper *fb_helper)
537{
538 if (fb_helper && fb_helper->info)
539 unregister_framebuffer(fb_helper->info);
540}
541EXPORT_SYMBOL(drm_fb_helper_unregister_info);
542
543/**
544 * drm_fb_helper_fini - finialize a &struct drm_fb_helper
545 * @fb_helper: driver-allocated fbdev helper, can be NULL
546 *
547 * This cleans up all remaining resources associated with @fb_helper.
548 */
549void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
550{
551 struct fb_info *info;
552
553 if (!fb_helper)
554 return;
555
556 fb_helper->dev->fb_helper = NULL;
557
558 if (!drm_fbdev_emulation)
559 return;
560
561 cancel_work_sync(&fb_helper->resume_work);
562 cancel_work_sync(&fb_helper->damage_work);
563
564 info = fb_helper->info;
565 if (info) {
566 if (info->cmap.len)
567 fb_dealloc_cmap(&info->cmap);
568 framebuffer_release(info);
569 }
570 fb_helper->info = NULL;
571
572 mutex_lock(&kernel_fb_helper_lock);
573 if (!list_empty(&fb_helper->kernel_fb_list)) {
574 list_del(&fb_helper->kernel_fb_list);
575 if (list_empty(&kernel_fb_helper_list))
576 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
577 }
578 mutex_unlock(&kernel_fb_helper_lock);
579
580 mutex_destroy(&fb_helper->lock);
581
582 if (!fb_helper->client.funcs)
583 drm_client_release(&fb_helper->client);
584}
585EXPORT_SYMBOL(drm_fb_helper_fini);
586
587static void drm_fb_helper_add_damage_clip(struct drm_fb_helper *helper, u32 x, u32 y,
588 u32 width, u32 height)
589{
590 struct drm_clip_rect *clip = &helper->damage_clip;
591 unsigned long flags;
592
593 spin_lock_irqsave(&helper->damage_lock, flags);
594 clip->x1 = min_t(u32, clip->x1, x);
595 clip->y1 = min_t(u32, clip->y1, y);
596 clip->x2 = max_t(u32, clip->x2, x + width);
597 clip->y2 = max_t(u32, clip->y2, y + height);
598 spin_unlock_irqrestore(&helper->damage_lock, flags);
599}
600
601static void drm_fb_helper_damage(struct drm_fb_helper *helper, u32 x, u32 y,
602 u32 width, u32 height)
603{
604 drm_fb_helper_add_damage_clip(helper, x, y, width, height);
605
606 schedule_work(&helper->damage_work);
607}
608
609/*
610 * Convert memory region into area of scanlines and pixels per
611 * scanline. The parameters off and len must not reach beyond
612 * the end of the framebuffer.
613 */
614static void drm_fb_helper_memory_range_to_clip(struct fb_info *info, off_t off, size_t len,
615 struct drm_rect *clip)
616{
617 off_t end = off + len;
618 u32 x1 = 0;
619 u32 y1 = off / info->fix.line_length;
620 u32 x2 = info->var.xres;
621 u32 y2 = DIV_ROUND_UP(end, info->fix.line_length);
622
623 if ((y2 - y1) == 1) {
624 /*
625 * We've only written to a single scanline. Try to reduce
626 * the number of horizontal pixels that need an update.
627 */
628 off_t bit_off = (off % info->fix.line_length) * 8;
629 off_t bit_end = (end % info->fix.line_length) * 8;
630
631 x1 = bit_off / info->var.bits_per_pixel;
632 x2 = DIV_ROUND_UP(bit_end, info->var.bits_per_pixel);
633 }
634
635 drm_rect_init(clip, x1, y1, x2 - x1, y2 - y1);
636}
637
638/**
639 * drm_fb_helper_deferred_io() - fbdev deferred_io callback function
640 * @info: fb_info struct pointer
641 * @pagereflist: list of mmap framebuffer pages that have to be flushed
642 *
643 * This function is used as the &fb_deferred_io.deferred_io
644 * callback function for flushing the fbdev mmap writes.
645 */
646void drm_fb_helper_deferred_io(struct fb_info *info, struct list_head *pagereflist)
647{
648 struct drm_fb_helper *helper = info->par;
649 unsigned long start, end, min_off, max_off;
650 struct fb_deferred_io_pageref *pageref;
651 struct drm_rect damage_area;
652
653 min_off = ULONG_MAX;
654 max_off = 0;
655 list_for_each_entry(pageref, pagereflist, list) {
656 start = pageref->offset;
657 end = start + PAGE_SIZE;
658 min_off = min(min_off, start);
659 max_off = max(max_off, end);
660 }
661
662 /*
663 * As we can only track pages, we might reach beyond the end
664 * of the screen and account for non-existing scanlines. Hence,
665 * keep the covered memory area within the screen buffer.
666 */
667 max_off = min(max_off, info->screen_size);
668
669 if (min_off < max_off) {
670 drm_fb_helper_memory_range_to_clip(info, min_off, max_off - min_off, &damage_area);
671 drm_fb_helper_damage(helper, damage_area.x1, damage_area.y1,
672 drm_rect_width(&damage_area),
673 drm_rect_height(&damage_area));
674 }
675}
676EXPORT_SYMBOL(drm_fb_helper_deferred_io);
677
678typedef ssize_t (*drm_fb_helper_read_screen)(struct fb_info *info, char __user *buf,
679 size_t count, loff_t pos);
680
681static ssize_t __drm_fb_helper_read(struct fb_info *info, char __user *buf, size_t count,
682 loff_t *ppos, drm_fb_helper_read_screen read_screen)
683{
684 loff_t pos = *ppos;
685 size_t total_size;
686 ssize_t ret;
687
688 if (info->screen_size)
689 total_size = info->screen_size;
690 else
691 total_size = info->fix.smem_len;
692
693 if (pos >= total_size)
694 return 0;
695 if (count >= total_size)
696 count = total_size;
697 if (total_size - count < pos)
698 count = total_size - pos;
699
700 if (info->fbops->fb_sync)
701 info->fbops->fb_sync(info);
702
703 ret = read_screen(info, buf, count, pos);
704 if (ret > 0)
705 *ppos += ret;
706
707 return ret;
708}
709
710typedef ssize_t (*drm_fb_helper_write_screen)(struct fb_info *info, const char __user *buf,
711 size_t count, loff_t pos);
712
713static ssize_t __drm_fb_helper_write(struct fb_info *info, const char __user *buf, size_t count,
714 loff_t *ppos, drm_fb_helper_write_screen write_screen)
715{
716 loff_t pos = *ppos;
717 size_t total_size;
718 ssize_t ret;
719 int err = 0;
720
721 if (info->screen_size)
722 total_size = info->screen_size;
723 else
724 total_size = info->fix.smem_len;
725
726 if (pos > total_size)
727 return -EFBIG;
728 if (count > total_size) {
729 err = -EFBIG;
730 count = total_size;
731 }
732 if (total_size - count < pos) {
733 if (!err)
734 err = -ENOSPC;
735 count = total_size - pos;
736 }
737
738 if (info->fbops->fb_sync)
739 info->fbops->fb_sync(info);
740
741 /*
742 * Copy to framebuffer even if we already logged an error. Emulates
743 * the behavior of the original fbdev implementation.
744 */
745 ret = write_screen(info, buf, count, pos);
746 if (ret < 0)
747 return ret; /* return last error, if any */
748 else if (!ret)
749 return err; /* return previous error, if any */
750
751 *ppos += ret;
752
753 return ret;
754}
755
756static ssize_t drm_fb_helper_read_screen_buffer(struct fb_info *info, char __user *buf,
757 size_t count, loff_t pos)
758{
759 const char *src = info->screen_buffer + pos;
760
761 if (copy_to_user(buf, src, count))
762 return -EFAULT;
763
764 return count;
765}
766
767/**
768 * drm_fb_helper_sys_read - Implements struct &fb_ops.fb_read for system memory
769 * @info: fb_info struct pointer
770 * @buf: userspace buffer to read from framebuffer memory
771 * @count: number of bytes to read from framebuffer memory
772 * @ppos: read offset within framebuffer memory
773 *
774 * Returns:
775 * The number of bytes read on success, or an error code otherwise.
776 */
777ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
778 size_t count, loff_t *ppos)
779{
780 return __drm_fb_helper_read(info, buf, count, ppos, drm_fb_helper_read_screen_buffer);
781}
782EXPORT_SYMBOL(drm_fb_helper_sys_read);
783
784static ssize_t drm_fb_helper_write_screen_buffer(struct fb_info *info, const char __user *buf,
785 size_t count, loff_t pos)
786{
787 char *dst = info->screen_buffer + pos;
788
789 if (copy_from_user(dst, buf, count))
790 return -EFAULT;
791
792 return count;
793}
794
795/**
796 * drm_fb_helper_sys_write - Implements struct &fb_ops.fb_write for system memory
797 * @info: fb_info struct pointer
798 * @buf: userspace buffer to write to framebuffer memory
799 * @count: number of bytes to write to framebuffer memory
800 * @ppos: write offset within framebuffer memory
801 *
802 * Returns:
803 * The number of bytes written on success, or an error code otherwise.
804 */
805ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
806 size_t count, loff_t *ppos)
807{
808 struct drm_fb_helper *helper = info->par;
809 loff_t pos = *ppos;
810 ssize_t ret;
811 struct drm_rect damage_area;
812
813 ret = __drm_fb_helper_write(info, buf, count, ppos, drm_fb_helper_write_screen_buffer);
814 if (ret <= 0)
815 return ret;
816
817 if (helper->funcs->fb_dirty) {
818 drm_fb_helper_memory_range_to_clip(info, pos, ret, &damage_area);
819 drm_fb_helper_damage(helper, damage_area.x1, damage_area.y1,
820 drm_rect_width(&damage_area),
821 drm_rect_height(&damage_area));
822 }
823
824 return ret;
825}
826EXPORT_SYMBOL(drm_fb_helper_sys_write);
827
828/**
829 * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
830 * @info: fbdev registered by the helper
831 * @rect: info about rectangle to fill
832 *
833 * A wrapper around sys_fillrect implemented by fbdev core
834 */
835void drm_fb_helper_sys_fillrect(struct fb_info *info,
836 const struct fb_fillrect *rect)
837{
838 struct drm_fb_helper *helper = info->par;
839
840 sys_fillrect(info, rect);
841
842 if (helper->funcs->fb_dirty)
843 drm_fb_helper_damage(helper, rect->dx, rect->dy, rect->width, rect->height);
844}
845EXPORT_SYMBOL(drm_fb_helper_sys_fillrect);
846
847/**
848 * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
849 * @info: fbdev registered by the helper
850 * @area: info about area to copy
851 *
852 * A wrapper around sys_copyarea implemented by fbdev core
853 */
854void drm_fb_helper_sys_copyarea(struct fb_info *info,
855 const struct fb_copyarea *area)
856{
857 struct drm_fb_helper *helper = info->par;
858
859 sys_copyarea(info, area);
860
861 if (helper->funcs->fb_dirty)
862 drm_fb_helper_damage(helper, area->dx, area->dy, area->width, area->height);
863}
864EXPORT_SYMBOL(drm_fb_helper_sys_copyarea);
865
866/**
867 * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
868 * @info: fbdev registered by the helper
869 * @image: info about image to blit
870 *
871 * A wrapper around sys_imageblit implemented by fbdev core
872 */
873void drm_fb_helper_sys_imageblit(struct fb_info *info,
874 const struct fb_image *image)
875{
876 struct drm_fb_helper *helper = info->par;
877
878 sys_imageblit(info, image);
879
880 if (helper->funcs->fb_dirty)
881 drm_fb_helper_damage(helper, image->dx, image->dy, image->width, image->height);
882}
883EXPORT_SYMBOL(drm_fb_helper_sys_imageblit);
884
885static ssize_t fb_read_screen_base(struct fb_info *info, char __user *buf, size_t count,
886 loff_t pos)
887{
888 const char __iomem *src = info->screen_base + pos;
889 size_t alloc_size = min_t(size_t, count, PAGE_SIZE);
890 ssize_t ret = 0;
891 int err = 0;
892 char *tmp;
893
894 tmp = kmalloc(alloc_size, GFP_KERNEL);
895 if (!tmp)
896 return -ENOMEM;
897
898 while (count) {
899 size_t c = min_t(size_t, count, alloc_size);
900
901 memcpy_fromio(tmp, src, c);
902 if (copy_to_user(buf, tmp, c)) {
903 err = -EFAULT;
904 break;
905 }
906
907 src += c;
908 buf += c;
909 ret += c;
910 count -= c;
911 }
912
913 kfree(tmp);
914
915 return ret ? ret : err;
916}
917
918/**
919 * drm_fb_helper_cfb_read - Implements struct &fb_ops.fb_read for I/O memory
920 * @info: fb_info struct pointer
921 * @buf: userspace buffer to read from framebuffer memory
922 * @count: number of bytes to read from framebuffer memory
923 * @ppos: read offset within framebuffer memory
924 *
925 * Returns:
926 * The number of bytes read on success, or an error code otherwise.
927 */
928ssize_t drm_fb_helper_cfb_read(struct fb_info *info, char __user *buf,
929 size_t count, loff_t *ppos)
930{
931 return __drm_fb_helper_read(info, buf, count, ppos, fb_read_screen_base);
932}
933EXPORT_SYMBOL(drm_fb_helper_cfb_read);
934
935static ssize_t fb_write_screen_base(struct fb_info *info, const char __user *buf, size_t count,
936 loff_t pos)
937{
938 char __iomem *dst = info->screen_base + pos;
939 size_t alloc_size = min_t(size_t, count, PAGE_SIZE);
940 ssize_t ret = 0;
941 int err = 0;
942 u8 *tmp;
943
944 tmp = kmalloc(alloc_size, GFP_KERNEL);
945 if (!tmp)
946 return -ENOMEM;
947
948 while (count) {
949 size_t c = min_t(size_t, count, alloc_size);
950
951 if (copy_from_user(tmp, buf, c)) {
952 err = -EFAULT;
953 break;
954 }
955 memcpy_toio(dst, tmp, c);
956
957 dst += c;
958 buf += c;
959 ret += c;
960 count -= c;
961 }
962
963 kfree(tmp);
964
965 return ret ? ret : err;
966}
967
968/**
969 * drm_fb_helper_cfb_write - Implements struct &fb_ops.fb_write for I/O memory
970 * @info: fb_info struct pointer
971 * @buf: userspace buffer to write to framebuffer memory
972 * @count: number of bytes to write to framebuffer memory
973 * @ppos: write offset within framebuffer memory
974 *
975 * Returns:
976 * The number of bytes written on success, or an error code otherwise.
977 */
978ssize_t drm_fb_helper_cfb_write(struct fb_info *info, const char __user *buf,
979 size_t count, loff_t *ppos)
980{
981 struct drm_fb_helper *helper = info->par;
982 loff_t pos = *ppos;
983 ssize_t ret;
984 struct drm_rect damage_area;
985
986 ret = __drm_fb_helper_write(info, buf, count, ppos, fb_write_screen_base);
987 if (ret <= 0)
988 return ret;
989
990 if (helper->funcs->fb_dirty) {
991 drm_fb_helper_memory_range_to_clip(info, pos, ret, &damage_area);
992 drm_fb_helper_damage(helper, damage_area.x1, damage_area.y1,
993 drm_rect_width(&damage_area),
994 drm_rect_height(&damage_area));
995 }
996
997 return ret;
998}
999EXPORT_SYMBOL(drm_fb_helper_cfb_write);
1000
1001/**
1002 * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
1003 * @info: fbdev registered by the helper
1004 * @rect: info about rectangle to fill
1005 *
1006 * A wrapper around cfb_fillrect implemented by fbdev core
1007 */
1008void drm_fb_helper_cfb_fillrect(struct fb_info *info,
1009 const struct fb_fillrect *rect)
1010{
1011 struct drm_fb_helper *helper = info->par;
1012
1013 cfb_fillrect(info, rect);
1014
1015 if (helper->funcs->fb_dirty)
1016 drm_fb_helper_damage(helper, rect->dx, rect->dy, rect->width, rect->height);
1017}
1018EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect);
1019
1020/**
1021 * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
1022 * @info: fbdev registered by the helper
1023 * @area: info about area to copy
1024 *
1025 * A wrapper around cfb_copyarea implemented by fbdev core
1026 */
1027void drm_fb_helper_cfb_copyarea(struct fb_info *info,
1028 const struct fb_copyarea *area)
1029{
1030 struct drm_fb_helper *helper = info->par;
1031
1032 cfb_copyarea(info, area);
1033
1034 if (helper->funcs->fb_dirty)
1035 drm_fb_helper_damage(helper, area->dx, area->dy, area->width, area->height);
1036}
1037EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea);
1038
1039/**
1040 * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
1041 * @info: fbdev registered by the helper
1042 * @image: info about image to blit
1043 *
1044 * A wrapper around cfb_imageblit implemented by fbdev core
1045 */
1046void drm_fb_helper_cfb_imageblit(struct fb_info *info,
1047 const struct fb_image *image)
1048{
1049 struct drm_fb_helper *helper = info->par;
1050
1051 cfb_imageblit(info, image);
1052
1053 if (helper->funcs->fb_dirty)
1054 drm_fb_helper_damage(helper, image->dx, image->dy, image->width, image->height);
1055}
1056EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
1057
1058/**
1059 * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
1060 * @fb_helper: driver-allocated fbdev helper, can be NULL
1061 * @suspend: whether to suspend or resume
1062 *
1063 * A wrapper around fb_set_suspend implemented by fbdev core.
1064 * Use drm_fb_helper_set_suspend_unlocked() if you don't need to take
1065 * the lock yourself
1066 */
1067void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend)
1068{
1069 if (fb_helper && fb_helper->info)
1070 fb_set_suspend(fb_helper->info, suspend);
1071}
1072EXPORT_SYMBOL(drm_fb_helper_set_suspend);
1073
1074/**
1075 * drm_fb_helper_set_suspend_unlocked - wrapper around fb_set_suspend that also
1076 * takes the console lock
1077 * @fb_helper: driver-allocated fbdev helper, can be NULL
1078 * @suspend: whether to suspend or resume
1079 *
1080 * A wrapper around fb_set_suspend() that takes the console lock. If the lock
1081 * isn't available on resume, a worker is tasked with waiting for the lock
1082 * to become available. The console lock can be pretty contented on resume
1083 * due to all the printk activity.
1084 *
1085 * This function can be called multiple times with the same state since
1086 * &fb_info.state is checked to see if fbdev is running or not before locking.
1087 *
1088 * Use drm_fb_helper_set_suspend() if you need to take the lock yourself.
1089 */
1090void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper,
1091 bool suspend)
1092{
1093 if (!fb_helper || !fb_helper->info)
1094 return;
1095
1096 /* make sure there's no pending/ongoing resume */
1097 flush_work(&fb_helper->resume_work);
1098
1099 if (suspend) {
1100 if (fb_helper->info->state != FBINFO_STATE_RUNNING)
1101 return;
1102
1103 console_lock();
1104
1105 } else {
1106 if (fb_helper->info->state == FBINFO_STATE_RUNNING)
1107 return;
1108
1109 if (!console_trylock()) {
1110 schedule_work(&fb_helper->resume_work);
1111 return;
1112 }
1113 }
1114
1115 fb_set_suspend(fb_helper->info, suspend);
1116 console_unlock();
1117}
1118EXPORT_SYMBOL(drm_fb_helper_set_suspend_unlocked);
1119
1120static int setcmap_pseudo_palette(struct fb_cmap *cmap, struct fb_info *info)
1121{
1122 u32 *palette = (u32 *)info->pseudo_palette;
1123 int i;
1124
1125 if (cmap->start + cmap->len > 16)
1126 return -EINVAL;
1127
1128 for (i = 0; i < cmap->len; ++i) {
1129 u16 red = cmap->red[i];
1130 u16 green = cmap->green[i];
1131 u16 blue = cmap->blue[i];
1132 u32 value;
1133
1134 red >>= 16 - info->var.red.length;
1135 green >>= 16 - info->var.green.length;
1136 blue >>= 16 - info->var.blue.length;
1137 value = (red << info->var.red.offset) |
1138 (green << info->var.green.offset) |
1139 (blue << info->var.blue.offset);
1140 if (info->var.transp.length > 0) {
1141 u32 mask = (1 << info->var.transp.length) - 1;
1142
1143 mask <<= info->var.transp.offset;
1144 value |= mask;
1145 }
1146 palette[cmap->start + i] = value;
1147 }
1148
1149 return 0;
1150}
1151
1152static int setcmap_legacy(struct fb_cmap *cmap, struct fb_info *info)
1153{
1154 struct drm_fb_helper *fb_helper = info->par;
1155 struct drm_mode_set *modeset;
1156 struct drm_crtc *crtc;
1157 u16 *r, *g, *b;
1158 int ret = 0;
1159
1160 drm_modeset_lock_all(fb_helper->dev);
1161 drm_client_for_each_modeset(modeset, &fb_helper->client) {
1162 crtc = modeset->crtc;
1163 if (!crtc->funcs->gamma_set || !crtc->gamma_size) {
1164 ret = -EINVAL;
1165 goto out;
1166 }
1167
1168 if (cmap->start + cmap->len > crtc->gamma_size) {
1169 ret = -EINVAL;
1170 goto out;
1171 }
1172
1173 r = crtc->gamma_store;
1174 g = r + crtc->gamma_size;
1175 b = g + crtc->gamma_size;
1176
1177 memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r));
1178 memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g));
1179 memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b));
1180
1181 ret = crtc->funcs->gamma_set(crtc, r, g, b,
1182 crtc->gamma_size, NULL);
1183 if (ret)
1184 goto out;
1185 }
1186out:
1187 drm_modeset_unlock_all(fb_helper->dev);
1188
1189 return ret;
1190}
1191
1192static struct drm_property_blob *setcmap_new_gamma_lut(struct drm_crtc *crtc,
1193 struct fb_cmap *cmap)
1194{
1195 struct drm_device *dev = crtc->dev;
1196 struct drm_property_blob *gamma_lut;
1197 struct drm_color_lut *lut;
1198 int size = crtc->gamma_size;
1199 int i;
1200
1201 if (!size || cmap->start + cmap->len > size)
1202 return ERR_PTR(-EINVAL);
1203
1204 gamma_lut = drm_property_create_blob(dev, sizeof(*lut) * size, NULL);
1205 if (IS_ERR(gamma_lut))
1206 return gamma_lut;
1207
1208 lut = gamma_lut->data;
1209 if (cmap->start || cmap->len != size) {
1210 u16 *r = crtc->gamma_store;
1211 u16 *g = r + crtc->gamma_size;
1212 u16 *b = g + crtc->gamma_size;
1213
1214 for (i = 0; i < cmap->start; i++) {
1215 lut[i].red = r[i];
1216 lut[i].green = g[i];
1217 lut[i].blue = b[i];
1218 }
1219 for (i = cmap->start + cmap->len; i < size; i++) {
1220 lut[i].red = r[i];
1221 lut[i].green = g[i];
1222 lut[i].blue = b[i];
1223 }
1224 }
1225
1226 for (i = 0; i < cmap->len; i++) {
1227 lut[cmap->start + i].red = cmap->red[i];
1228 lut[cmap->start + i].green = cmap->green[i];
1229 lut[cmap->start + i].blue = cmap->blue[i];
1230 }
1231
1232 return gamma_lut;
1233}
1234
1235static int setcmap_atomic(struct fb_cmap *cmap, struct fb_info *info)
1236{
1237 struct drm_fb_helper *fb_helper = info->par;
1238 struct drm_device *dev = fb_helper->dev;
1239 struct drm_property_blob *gamma_lut = NULL;
1240 struct drm_modeset_acquire_ctx ctx;
1241 struct drm_crtc_state *crtc_state;
1242 struct drm_atomic_state *state;
1243 struct drm_mode_set *modeset;
1244 struct drm_crtc *crtc;
1245 u16 *r, *g, *b;
1246 bool replaced;
1247 int ret = 0;
1248
1249 drm_modeset_acquire_init(&ctx, 0);
1250
1251 state = drm_atomic_state_alloc(dev);
1252 if (!state) {
1253 ret = -ENOMEM;
1254 goto out_ctx;
1255 }
1256
1257 state->acquire_ctx = &ctx;
1258retry:
1259 drm_client_for_each_modeset(modeset, &fb_helper->client) {
1260 crtc = modeset->crtc;
1261
1262 if (!gamma_lut)
1263 gamma_lut = setcmap_new_gamma_lut(crtc, cmap);
1264 if (IS_ERR(gamma_lut)) {
1265 ret = PTR_ERR(gamma_lut);
1266 gamma_lut = NULL;
1267 goto out_state;
1268 }
1269
1270 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1271 if (IS_ERR(crtc_state)) {
1272 ret = PTR_ERR(crtc_state);
1273 goto out_state;
1274 }
1275
1276 /*
1277 * FIXME: This always uses gamma_lut. Some HW have only
1278 * degamma_lut, in which case we should reset gamma_lut and set
1279 * degamma_lut. See drm_crtc_legacy_gamma_set().
1280 */
1281 replaced = drm_property_replace_blob(&crtc_state->degamma_lut,
1282 NULL);
1283 replaced |= drm_property_replace_blob(&crtc_state->ctm, NULL);
1284 replaced |= drm_property_replace_blob(&crtc_state->gamma_lut,
1285 gamma_lut);
1286 crtc_state->color_mgmt_changed |= replaced;
1287 }
1288
1289 ret = drm_atomic_commit(state);
1290 if (ret)
1291 goto out_state;
1292
1293 drm_client_for_each_modeset(modeset, &fb_helper->client) {
1294 crtc = modeset->crtc;
1295
1296 r = crtc->gamma_store;
1297 g = r + crtc->gamma_size;
1298 b = g + crtc->gamma_size;
1299
1300 memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r));
1301 memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g));
1302 memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b));
1303 }
1304
1305out_state:
1306 if (ret == -EDEADLK)
1307 goto backoff;
1308
1309 drm_property_blob_put(gamma_lut);
1310 drm_atomic_state_put(state);
1311out_ctx:
1312 drm_modeset_drop_locks(&ctx);
1313 drm_modeset_acquire_fini(&ctx);
1314
1315 return ret;
1316
1317backoff:
1318 drm_atomic_state_clear(state);
1319 drm_modeset_backoff(&ctx);
1320 goto retry;
1321}
1322
1323/**
1324 * drm_fb_helper_setcmap - implementation for &fb_ops.fb_setcmap
1325 * @cmap: cmap to set
1326 * @info: fbdev registered by the helper
1327 */
1328int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1329{
1330 struct drm_fb_helper *fb_helper = info->par;
1331 struct drm_device *dev = fb_helper->dev;
1332 int ret;
1333
1334 if (oops_in_progress)
1335 return -EBUSY;
1336
1337 mutex_lock(&fb_helper->lock);
1338
1339 if (!drm_master_internal_acquire(dev)) {
1340 ret = -EBUSY;
1341 goto unlock;
1342 }
1343
1344 mutex_lock(&fb_helper->client.modeset_mutex);
1345 if (info->fix.visual == FB_VISUAL_TRUECOLOR)
1346 ret = setcmap_pseudo_palette(cmap, info);
1347 else if (drm_drv_uses_atomic_modeset(fb_helper->dev))
1348 ret = setcmap_atomic(cmap, info);
1349 else
1350 ret = setcmap_legacy(cmap, info);
1351 mutex_unlock(&fb_helper->client.modeset_mutex);
1352
1353 drm_master_internal_release(dev);
1354unlock:
1355 mutex_unlock(&fb_helper->lock);
1356
1357 return ret;
1358}
1359EXPORT_SYMBOL(drm_fb_helper_setcmap);
1360
1361/**
1362 * drm_fb_helper_ioctl - legacy ioctl implementation
1363 * @info: fbdev registered by the helper
1364 * @cmd: ioctl command
1365 * @arg: ioctl argument
1366 *
1367 * A helper to implement the standard fbdev ioctl. Only
1368 * FBIO_WAITFORVSYNC is implemented for now.
1369 */
1370int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd,
1371 unsigned long arg)
1372{
1373 struct drm_fb_helper *fb_helper = info->par;
1374 struct drm_device *dev = fb_helper->dev;
1375 struct drm_crtc *crtc;
1376 int ret = 0;
1377
1378 mutex_lock(&fb_helper->lock);
1379 if (!drm_master_internal_acquire(dev)) {
1380 ret = -EBUSY;
1381 goto unlock;
1382 }
1383
1384 switch (cmd) {
1385 case FBIO_WAITFORVSYNC:
1386 /*
1387 * Only consider the first CRTC.
1388 *
1389 * This ioctl is supposed to take the CRTC number as
1390 * an argument, but in fbdev times, what that number
1391 * was supposed to be was quite unclear, different
1392 * drivers were passing that argument differently
1393 * (some by reference, some by value), and most of the
1394 * userspace applications were just hardcoding 0 as an
1395 * argument.
1396 *
1397 * The first CRTC should be the integrated panel on
1398 * most drivers, so this is the best choice we can
1399 * make. If we're not smart enough here, one should
1400 * just consider switch the userspace to KMS.
1401 */
1402 crtc = fb_helper->client.modesets[0].crtc;
1403
1404 /*
1405 * Only wait for a vblank event if the CRTC is
1406 * enabled, otherwise just don't do anythintg,
1407 * not even report an error.
1408 */
1409 ret = drm_crtc_vblank_get(crtc);
1410 if (!ret) {
1411 drm_crtc_wait_one_vblank(crtc);
1412 drm_crtc_vblank_put(crtc);
1413 }
1414
1415 ret = 0;
1416 break;
1417 default:
1418 ret = -ENOTTY;
1419 }
1420
1421 drm_master_internal_release(dev);
1422unlock:
1423 mutex_unlock(&fb_helper->lock);
1424 return ret;
1425}
1426EXPORT_SYMBOL(drm_fb_helper_ioctl);
1427
1428static bool drm_fb_pixel_format_equal(const struct fb_var_screeninfo *var_1,
1429 const struct fb_var_screeninfo *var_2)
1430{
1431 return var_1->bits_per_pixel == var_2->bits_per_pixel &&
1432 var_1->grayscale == var_2->grayscale &&
1433 var_1->red.offset == var_2->red.offset &&
1434 var_1->red.length == var_2->red.length &&
1435 var_1->red.msb_right == var_2->red.msb_right &&
1436 var_1->green.offset == var_2->green.offset &&
1437 var_1->green.length == var_2->green.length &&
1438 var_1->green.msb_right == var_2->green.msb_right &&
1439 var_1->blue.offset == var_2->blue.offset &&
1440 var_1->blue.length == var_2->blue.length &&
1441 var_1->blue.msb_right == var_2->blue.msb_right &&
1442 var_1->transp.offset == var_2->transp.offset &&
1443 var_1->transp.length == var_2->transp.length &&
1444 var_1->transp.msb_right == var_2->transp.msb_right;
1445}
1446
1447static void drm_fb_helper_fill_pixel_fmt(struct fb_var_screeninfo *var,
1448 const struct drm_format_info *format)
1449{
1450 u8 depth = format->depth;
1451
1452 if (format->is_color_indexed) {
1453 var->red.offset = 0;
1454 var->green.offset = 0;
1455 var->blue.offset = 0;
1456 var->red.length = depth;
1457 var->green.length = depth;
1458 var->blue.length = depth;
1459 var->transp.offset = 0;
1460 var->transp.length = 0;
1461 return;
1462 }
1463
1464 switch (depth) {
1465 case 15:
1466 var->red.offset = 10;
1467 var->green.offset = 5;
1468 var->blue.offset = 0;
1469 var->red.length = 5;
1470 var->green.length = 5;
1471 var->blue.length = 5;
1472 var->transp.offset = 15;
1473 var->transp.length = 1;
1474 break;
1475 case 16:
1476 var->red.offset = 11;
1477 var->green.offset = 5;
1478 var->blue.offset = 0;
1479 var->red.length = 5;
1480 var->green.length = 6;
1481 var->blue.length = 5;
1482 var->transp.offset = 0;
1483 break;
1484 case 24:
1485 var->red.offset = 16;
1486 var->green.offset = 8;
1487 var->blue.offset = 0;
1488 var->red.length = 8;
1489 var->green.length = 8;
1490 var->blue.length = 8;
1491 var->transp.offset = 0;
1492 var->transp.length = 0;
1493 break;
1494 case 32:
1495 var->red.offset = 16;
1496 var->green.offset = 8;
1497 var->blue.offset = 0;
1498 var->red.length = 8;
1499 var->green.length = 8;
1500 var->blue.length = 8;
1501 var->transp.offset = 24;
1502 var->transp.length = 8;
1503 break;
1504 default:
1505 break;
1506 }
1507}
1508
1509/**
1510 * drm_fb_helper_check_var - implementation for &fb_ops.fb_check_var
1511 * @var: screeninfo to check
1512 * @info: fbdev registered by the helper
1513 */
1514int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
1515 struct fb_info *info)
1516{
1517 struct drm_fb_helper *fb_helper = info->par;
1518 struct drm_framebuffer *fb = fb_helper->fb;
1519 const struct drm_format_info *format = fb->format;
1520 struct drm_device *dev = fb_helper->dev;
1521 unsigned int bpp;
1522
1523 if (in_dbg_master())
1524 return -EINVAL;
1525
1526 if (var->pixclock != 0) {
1527 drm_dbg_kms(dev, "fbdev emulation doesn't support changing the pixel clock, value of pixclock is ignored\n");
1528 var->pixclock = 0;
1529 }
1530
1531 switch (format->format) {
1532 case DRM_FORMAT_C1:
1533 case DRM_FORMAT_C2:
1534 case DRM_FORMAT_C4:
1535 /* supported format with sub-byte pixels */
1536 break;
1537
1538 default:
1539 if ((drm_format_info_block_width(format, 0) > 1) ||
1540 (drm_format_info_block_height(format, 0) > 1))
1541 return -EINVAL;
1542 break;
1543 }
1544
1545 /*
1546 * Changes struct fb_var_screeninfo are currently not pushed back
1547 * to KMS, hence fail if different settings are requested.
1548 */
1549 bpp = drm_format_info_bpp(format, 0);
1550 if (var->bits_per_pixel > bpp ||
1551 var->xres > fb->width || var->yres > fb->height ||
1552 var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
1553 drm_dbg_kms(dev, "fb requested width/height/bpp can't fit in current fb "
1554 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1555 var->xres, var->yres, var->bits_per_pixel,
1556 var->xres_virtual, var->yres_virtual,
1557 fb->width, fb->height, bpp);
1558 return -EINVAL;
1559 }
1560
1561 /*
1562 * Workaround for SDL 1.2, which is known to be setting all pixel format
1563 * fields values to zero in some cases. We treat this situation as a
1564 * kind of "use some reasonable autodetected values".
1565 */
1566 if (!var->red.offset && !var->green.offset &&
1567 !var->blue.offset && !var->transp.offset &&
1568 !var->red.length && !var->green.length &&
1569 !var->blue.length && !var->transp.length &&
1570 !var->red.msb_right && !var->green.msb_right &&
1571 !var->blue.msb_right && !var->transp.msb_right) {
1572 drm_fb_helper_fill_pixel_fmt(var, format);
1573 }
1574
1575 /*
1576 * Likewise, bits_per_pixel should be rounded up to a supported value.
1577 */
1578 var->bits_per_pixel = bpp;
1579
1580 /*
1581 * drm fbdev emulation doesn't support changing the pixel format at all,
1582 * so reject all pixel format changing requests.
1583 */
1584 if (!drm_fb_pixel_format_equal(var, &info->var)) {
1585 drm_dbg_kms(dev, "fbdev emulation doesn't support changing the pixel format\n");
1586 return -EINVAL;
1587 }
1588
1589 return 0;
1590}
1591EXPORT_SYMBOL(drm_fb_helper_check_var);
1592
1593/**
1594 * drm_fb_helper_set_par - implementation for &fb_ops.fb_set_par
1595 * @info: fbdev registered by the helper
1596 *
1597 * This will let fbcon do the mode init and is called at initialization time by
1598 * the fbdev core when registering the driver, and later on through the hotplug
1599 * callback.
1600 */
1601int drm_fb_helper_set_par(struct fb_info *info)
1602{
1603 struct drm_fb_helper *fb_helper = info->par;
1604 struct fb_var_screeninfo *var = &info->var;
1605 bool force;
1606
1607 if (oops_in_progress)
1608 return -EBUSY;
1609
1610 if (var->pixclock != 0) {
1611 drm_err(fb_helper->dev, "PIXEL CLOCK SET\n");
1612 return -EINVAL;
1613 }
1614
1615 /*
1616 * Normally we want to make sure that a kms master takes precedence over
1617 * fbdev, to avoid fbdev flickering and occasionally stealing the
1618 * display status. But Xorg first sets the vt back to text mode using
1619 * the KDSET IOCTL with KD_TEXT, and only after that drops the master
1620 * status when exiting.
1621 *
1622 * In the past this was caught by drm_fb_helper_lastclose(), but on
1623 * modern systems where logind always keeps a drm fd open to orchestrate
1624 * the vt switching, this doesn't work.
1625 *
1626 * To not break the userspace ABI we have this special case here, which
1627 * is only used for the above case. Everything else uses the normal
1628 * commit function, which ensures that we never steal the display from
1629 * an active drm master.
1630 */
1631 force = var->activate & FB_ACTIVATE_KD_TEXT;
1632
1633 __drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper, force);
1634
1635 return 0;
1636}
1637EXPORT_SYMBOL(drm_fb_helper_set_par);
1638
1639static void pan_set(struct drm_fb_helper *fb_helper, int x, int y)
1640{
1641 struct drm_mode_set *mode_set;
1642
1643 mutex_lock(&fb_helper->client.modeset_mutex);
1644 drm_client_for_each_modeset(mode_set, &fb_helper->client) {
1645 mode_set->x = x;
1646 mode_set->y = y;
1647 }
1648 mutex_unlock(&fb_helper->client.modeset_mutex);
1649}
1650
1651static int pan_display_atomic(struct fb_var_screeninfo *var,
1652 struct fb_info *info)
1653{
1654 struct drm_fb_helper *fb_helper = info->par;
1655 int ret;
1656
1657 pan_set(fb_helper, var->xoffset, var->yoffset);
1658
1659 ret = drm_client_modeset_commit_locked(&fb_helper->client);
1660 if (!ret) {
1661 info->var.xoffset = var->xoffset;
1662 info->var.yoffset = var->yoffset;
1663 } else
1664 pan_set(fb_helper, info->var.xoffset, info->var.yoffset);
1665
1666 return ret;
1667}
1668
1669static int pan_display_legacy(struct fb_var_screeninfo *var,
1670 struct fb_info *info)
1671{
1672 struct drm_fb_helper *fb_helper = info->par;
1673 struct drm_client_dev *client = &fb_helper->client;
1674 struct drm_mode_set *modeset;
1675 int ret = 0;
1676
1677 mutex_lock(&client->modeset_mutex);
1678 drm_modeset_lock_all(fb_helper->dev);
1679 drm_client_for_each_modeset(modeset, client) {
1680 modeset->x = var->xoffset;
1681 modeset->y = var->yoffset;
1682
1683 if (modeset->num_connectors) {
1684 ret = drm_mode_set_config_internal(modeset);
1685 if (!ret) {
1686 info->var.xoffset = var->xoffset;
1687 info->var.yoffset = var->yoffset;
1688 }
1689 }
1690 }
1691 drm_modeset_unlock_all(fb_helper->dev);
1692 mutex_unlock(&client->modeset_mutex);
1693
1694 return ret;
1695}
1696
1697/**
1698 * drm_fb_helper_pan_display - implementation for &fb_ops.fb_pan_display
1699 * @var: updated screen information
1700 * @info: fbdev registered by the helper
1701 */
1702int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
1703 struct fb_info *info)
1704{
1705 struct drm_fb_helper *fb_helper = info->par;
1706 struct drm_device *dev = fb_helper->dev;
1707 int ret;
1708
1709 if (oops_in_progress)
1710 return -EBUSY;
1711
1712 mutex_lock(&fb_helper->lock);
1713 if (!drm_master_internal_acquire(dev)) {
1714 ret = -EBUSY;
1715 goto unlock;
1716 }
1717
1718 if (drm_drv_uses_atomic_modeset(dev))
1719 ret = pan_display_atomic(var, info);
1720 else
1721 ret = pan_display_legacy(var, info);
1722
1723 drm_master_internal_release(dev);
1724unlock:
1725 mutex_unlock(&fb_helper->lock);
1726
1727 return ret;
1728}
1729EXPORT_SYMBOL(drm_fb_helper_pan_display);
1730
1731/*
1732 * Allocates the backing storage and sets up the fbdev info structure through
1733 * the ->fb_probe callback.
1734 */
1735static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
1736 int preferred_bpp)
1737{
1738 struct drm_client_dev *client = &fb_helper->client;
1739 struct drm_device *dev = fb_helper->dev;
1740 struct drm_mode_config *config = &dev->mode_config;
1741 int ret = 0;
1742 int crtc_count = 0;
1743 struct drm_connector_list_iter conn_iter;
1744 struct drm_fb_helper_surface_size sizes;
1745 struct drm_connector *connector;
1746 struct drm_mode_set *mode_set;
1747 int best_depth = 0;
1748
1749 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
1750 sizes.surface_depth = 24;
1751 sizes.surface_bpp = 32;
1752 sizes.fb_width = (u32)-1;
1753 sizes.fb_height = (u32)-1;
1754
1755 /*
1756 * If driver picks 8 or 16 by default use that for both depth/bpp
1757 * to begin with
1758 */
1759 if (preferred_bpp != sizes.surface_bpp)
1760 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
1761
1762 drm_connector_list_iter_begin(fb_helper->dev, &conn_iter);
1763 drm_client_for_each_connector_iter(connector, &conn_iter) {
1764 struct drm_cmdline_mode *cmdline_mode;
1765
1766 cmdline_mode = &connector->cmdline_mode;
1767
1768 if (cmdline_mode->bpp_specified) {
1769 switch (cmdline_mode->bpp) {
1770 case 8:
1771 sizes.surface_depth = sizes.surface_bpp = 8;
1772 break;
1773 case 15:
1774 sizes.surface_depth = 15;
1775 sizes.surface_bpp = 16;
1776 break;
1777 case 16:
1778 sizes.surface_depth = sizes.surface_bpp = 16;
1779 break;
1780 case 24:
1781 sizes.surface_depth = sizes.surface_bpp = 24;
1782 break;
1783 case 32:
1784 sizes.surface_depth = 24;
1785 sizes.surface_bpp = 32;
1786 break;
1787 }
1788 break;
1789 }
1790 }
1791 drm_connector_list_iter_end(&conn_iter);
1792
1793 /*
1794 * If we run into a situation where, for example, the primary plane
1795 * supports RGBA5551 (16 bpp, depth 15) but not RGB565 (16 bpp, depth
1796 * 16) we need to scale down the depth of the sizes we request.
1797 */
1798 mutex_lock(&client->modeset_mutex);
1799 drm_client_for_each_modeset(mode_set, client) {
1800 struct drm_crtc *crtc = mode_set->crtc;
1801 struct drm_plane *plane = crtc->primary;
1802 int j;
1803
1804 drm_dbg_kms(dev, "test CRTC %u primary plane\n", drm_crtc_index(crtc));
1805
1806 for (j = 0; j < plane->format_count; j++) {
1807 const struct drm_format_info *fmt;
1808
1809 fmt = drm_format_info(plane->format_types[j]);
1810
1811 /*
1812 * Do not consider YUV or other complicated formats
1813 * for framebuffers. This means only legacy formats
1814 * are supported (fmt->depth is a legacy field) but
1815 * the framebuffer emulation can only deal with such
1816 * formats, specifically RGB/BGA formats.
1817 */
1818 if (fmt->depth == 0)
1819 continue;
1820
1821 /* We found a perfect fit, great */
1822 if (fmt->depth == sizes.surface_depth) {
1823 best_depth = fmt->depth;
1824 break;
1825 }
1826
1827 /* Skip depths above what we're looking for */
1828 if (fmt->depth > sizes.surface_depth)
1829 continue;
1830
1831 /* Best depth found so far */
1832 if (fmt->depth > best_depth)
1833 best_depth = fmt->depth;
1834 }
1835 }
1836 if (sizes.surface_depth != best_depth && best_depth) {
1837 drm_info(dev, "requested bpp %d, scaled depth down to %d",
1838 sizes.surface_bpp, best_depth);
1839 sizes.surface_depth = best_depth;
1840 }
1841
1842 /* first up get a count of crtcs now in use and new min/maxes width/heights */
1843 crtc_count = 0;
1844 drm_client_for_each_modeset(mode_set, client) {
1845 struct drm_display_mode *desired_mode;
1846 int x, y, j;
1847 /* in case of tile group, are we the last tile vert or horiz?
1848 * If no tile group you are always the last one both vertically
1849 * and horizontally
1850 */
1851 bool lastv = true, lasth = true;
1852
1853 desired_mode = mode_set->mode;
1854
1855 if (!desired_mode)
1856 continue;
1857
1858 crtc_count++;
1859
1860 x = mode_set->x;
1861 y = mode_set->y;
1862
1863 sizes.surface_width = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
1864 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
1865
1866 for (j = 0; j < mode_set->num_connectors; j++) {
1867 struct drm_connector *connector = mode_set->connectors[j];
1868
1869 if (connector->has_tile &&
1870 desired_mode->hdisplay == connector->tile_h_size &&
1871 desired_mode->vdisplay == connector->tile_v_size) {
1872 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
1873 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
1874 /* cloning to multiple tiles is just crazy-talk, so: */
1875 break;
1876 }
1877 }
1878
1879 if (lasth)
1880 sizes.fb_width = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
1881 if (lastv)
1882 sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
1883 }
1884 mutex_unlock(&client->modeset_mutex);
1885
1886 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1887 drm_info(dev, "Cannot find any crtc or sizes\n");
1888
1889 /* First time: disable all crtc's.. */
1890 if (!fb_helper->deferred_setup)
1891 drm_client_modeset_commit(client);
1892 return -EAGAIN;
1893 }
1894
1895 /* Handle our overallocation */
1896 sizes.surface_height *= drm_fbdev_overalloc;
1897 sizes.surface_height /= 100;
1898 if (sizes.surface_height > config->max_height) {
1899 drm_dbg_kms(dev, "Fbdev over-allocation too large; clamping height to %d\n",
1900 config->max_height);
1901 sizes.surface_height = config->max_height;
1902 }
1903
1904#if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM)
1905 fb_helper->hint_leak_smem_start = drm_leak_fbdev_smem;
1906#endif
1907
1908 /* push down into drivers */
1909 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1910 if (ret < 0)
1911 return ret;
1912
1913 strcpy(fb_helper->fb->comm, "[fbcon]");
1914
1915 /* Set the fb info for vgaswitcheroo clients. Does nothing otherwise. */
1916 if (dev_is_pci(dev->dev))
1917 vga_switcheroo_client_fb_set(to_pci_dev(dev->dev), fb_helper->info);
1918
1919 return 0;
1920}
1921
1922static void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1923 bool is_color_indexed)
1924{
1925 info->fix.type = FB_TYPE_PACKED_PIXELS;
1926 info->fix.visual = is_color_indexed ? FB_VISUAL_PSEUDOCOLOR
1927 : FB_VISUAL_TRUECOLOR;
1928 info->fix.mmio_start = 0;
1929 info->fix.mmio_len = 0;
1930 info->fix.type_aux = 0;
1931 info->fix.xpanstep = 1; /* doing it in hw */
1932 info->fix.ypanstep = 1; /* doing it in hw */
1933 info->fix.ywrapstep = 0;
1934 info->fix.accel = FB_ACCEL_NONE;
1935
1936 info->fix.line_length = pitch;
1937}
1938
1939static void drm_fb_helper_fill_var(struct fb_info *info,
1940 struct drm_fb_helper *fb_helper,
1941 uint32_t fb_width, uint32_t fb_height)
1942{
1943 struct drm_framebuffer *fb = fb_helper->fb;
1944 const struct drm_format_info *format = fb->format;
1945
1946 switch (format->format) {
1947 case DRM_FORMAT_C1:
1948 case DRM_FORMAT_C2:
1949 case DRM_FORMAT_C4:
1950 /* supported format with sub-byte pixels */
1951 break;
1952
1953 default:
1954 WARN_ON((drm_format_info_block_width(format, 0) > 1) ||
1955 (drm_format_info_block_height(format, 0) > 1));
1956 break;
1957 }
1958
1959 info->pseudo_palette = fb_helper->pseudo_palette;
1960 info->var.xres_virtual = fb->width;
1961 info->var.yres_virtual = fb->height;
1962 info->var.bits_per_pixel = drm_format_info_bpp(format, 0);
1963 info->var.accel_flags = FB_ACCELF_TEXT;
1964 info->var.xoffset = 0;
1965 info->var.yoffset = 0;
1966 info->var.activate = FB_ACTIVATE_NOW;
1967
1968 drm_fb_helper_fill_pixel_fmt(&info->var, format);
1969
1970 info->var.xres = fb_width;
1971 info->var.yres = fb_height;
1972}
1973
1974/**
1975 * drm_fb_helper_fill_info - initializes fbdev information
1976 * @info: fbdev instance to set up
1977 * @fb_helper: fb helper instance to use as template
1978 * @sizes: describes fbdev size and scanout surface size
1979 *
1980 * Sets up the variable and fixed fbdev metainformation from the given fb helper
1981 * instance and the drm framebuffer allocated in &drm_fb_helper.fb.
1982 *
1983 * Drivers should call this (or their equivalent setup code) from their
1984 * &drm_fb_helper_funcs.fb_probe callback after having allocated the fbdev
1985 * backing storage framebuffer.
1986 */
1987void drm_fb_helper_fill_info(struct fb_info *info,
1988 struct drm_fb_helper *fb_helper,
1989 struct drm_fb_helper_surface_size *sizes)
1990{
1991 struct drm_framebuffer *fb = fb_helper->fb;
1992
1993 drm_fb_helper_fill_fix(info, fb->pitches[0],
1994 fb->format->is_color_indexed);
1995 drm_fb_helper_fill_var(info, fb_helper,
1996 sizes->fb_width, sizes->fb_height);
1997
1998 info->par = fb_helper;
1999 /*
2000 * The DRM drivers fbdev emulation device name can be confusing if the
2001 * driver name also has a "drm" suffix on it. Leading to names such as
2002 * "simpledrmdrmfb" in /proc/fb. Unfortunately, it's an uAPI and can't
2003 * be changed due user-space tools (e.g: pm-utils) matching against it.
2004 */
2005 snprintf(info->fix.id, sizeof(info->fix.id), "%sdrmfb",
2006 fb_helper->dev->driver->name);
2007
2008}
2009EXPORT_SYMBOL(drm_fb_helper_fill_info);
2010
2011/*
2012 * This is a continuation of drm_setup_crtcs() that sets up anything related
2013 * to the framebuffer. During initialization, drm_setup_crtcs() is called before
2014 * the framebuffer has been allocated (fb_helper->fb and fb_helper->info).
2015 * So, any setup that touches those fields needs to be done here instead of in
2016 * drm_setup_crtcs().
2017 */
2018static void drm_setup_crtcs_fb(struct drm_fb_helper *fb_helper)
2019{
2020 struct drm_client_dev *client = &fb_helper->client;
2021 struct drm_connector_list_iter conn_iter;
2022 struct fb_info *info = fb_helper->info;
2023 unsigned int rotation, sw_rotations = 0;
2024 struct drm_connector *connector;
2025 struct drm_mode_set *modeset;
2026
2027 mutex_lock(&client->modeset_mutex);
2028 drm_client_for_each_modeset(modeset, client) {
2029 if (!modeset->num_connectors)
2030 continue;
2031
2032 modeset->fb = fb_helper->fb;
2033
2034 if (drm_client_rotation(modeset, &rotation))
2035 /* Rotating in hardware, fbcon should not rotate */
2036 sw_rotations |= DRM_MODE_ROTATE_0;
2037 else
2038 sw_rotations |= rotation;
2039 }
2040 mutex_unlock(&client->modeset_mutex);
2041
2042 drm_connector_list_iter_begin(fb_helper->dev, &conn_iter);
2043 drm_client_for_each_connector_iter(connector, &conn_iter) {
2044
2045 /* use first connected connector for the physical dimensions */
2046 if (connector->status == connector_status_connected) {
2047 info->var.width = connector->display_info.width_mm;
2048 info->var.height = connector->display_info.height_mm;
2049 break;
2050 }
2051 }
2052 drm_connector_list_iter_end(&conn_iter);
2053
2054 switch (sw_rotations) {
2055 case DRM_MODE_ROTATE_0:
2056 info->fbcon_rotate_hint = FB_ROTATE_UR;
2057 break;
2058 case DRM_MODE_ROTATE_90:
2059 info->fbcon_rotate_hint = FB_ROTATE_CCW;
2060 break;
2061 case DRM_MODE_ROTATE_180:
2062 info->fbcon_rotate_hint = FB_ROTATE_UD;
2063 break;
2064 case DRM_MODE_ROTATE_270:
2065 info->fbcon_rotate_hint = FB_ROTATE_CW;
2066 break;
2067 default:
2068 /*
2069 * Multiple bits are set / multiple rotations requested
2070 * fbcon cannot handle separate rotation settings per
2071 * output, so fallback to unrotated.
2072 */
2073 info->fbcon_rotate_hint = FB_ROTATE_UR;
2074 }
2075}
2076
2077/* Note: Drops fb_helper->lock before returning. */
2078static int
2079__drm_fb_helper_initial_config_and_unlock(struct drm_fb_helper *fb_helper,
2080 int bpp_sel)
2081{
2082 struct drm_device *dev = fb_helper->dev;
2083 struct fb_info *info;
2084 unsigned int width, height;
2085 int ret;
2086
2087 width = dev->mode_config.max_width;
2088 height = dev->mode_config.max_height;
2089
2090 drm_client_modeset_probe(&fb_helper->client, width, height);
2091 ret = drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
2092 if (ret < 0) {
2093 if (ret == -EAGAIN) {
2094 fb_helper->preferred_bpp = bpp_sel;
2095 fb_helper->deferred_setup = true;
2096 ret = 0;
2097 }
2098 mutex_unlock(&fb_helper->lock);
2099
2100 return ret;
2101 }
2102 drm_setup_crtcs_fb(fb_helper);
2103
2104 fb_helper->deferred_setup = false;
2105
2106 info = fb_helper->info;
2107 info->var.pixclock = 0;
2108 /* Shamelessly allow physical address leaking to userspace */
2109#if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM)
2110 if (!fb_helper->hint_leak_smem_start)
2111#endif
2112 /* don't leak any physical addresses to userspace */
2113 info->flags |= FBINFO_HIDE_SMEM_START;
2114
2115 /* Need to drop locks to avoid recursive deadlock in
2116 * register_framebuffer. This is ok because the only thing left to do is
2117 * register the fbdev emulation instance in kernel_fb_helper_list. */
2118 mutex_unlock(&fb_helper->lock);
2119
2120 ret = register_framebuffer(info);
2121 if (ret < 0)
2122 return ret;
2123
2124 drm_info(dev, "fb%d: %s frame buffer device\n",
2125 info->node, info->fix.id);
2126
2127 mutex_lock(&kernel_fb_helper_lock);
2128 if (list_empty(&kernel_fb_helper_list))
2129 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
2130
2131 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
2132 mutex_unlock(&kernel_fb_helper_lock);
2133
2134 return 0;
2135}
2136
2137/**
2138 * drm_fb_helper_initial_config - setup a sane initial connector configuration
2139 * @fb_helper: fb_helper device struct
2140 * @bpp_sel: bpp value to use for the framebuffer configuration
2141 *
2142 * Scans the CRTCs and connectors and tries to put together an initial setup.
2143 * At the moment, this is a cloned configuration across all heads with
2144 * a new framebuffer object as the backing store.
2145 *
2146 * Note that this also registers the fbdev and so allows userspace to call into
2147 * the driver through the fbdev interfaces.
2148 *
2149 * This function will call down into the &drm_fb_helper_funcs.fb_probe callback
2150 * to let the driver allocate and initialize the fbdev info structure and the
2151 * drm framebuffer used to back the fbdev. drm_fb_helper_fill_info() is provided
2152 * as a helper to setup simple default values for the fbdev info structure.
2153 *
2154 * HANG DEBUGGING:
2155 *
2156 * When you have fbcon support built-in or already loaded, this function will do
2157 * a full modeset to setup the fbdev console. Due to locking misdesign in the
2158 * VT/fbdev subsystem that entire modeset sequence has to be done while holding
2159 * console_lock. Until console_unlock is called no dmesg lines will be sent out
2160 * to consoles, not even serial console. This means when your driver crashes,
2161 * you will see absolutely nothing else but a system stuck in this function,
2162 * with no further output. Any kind of printk() you place within your own driver
2163 * or in the drm core modeset code will also never show up.
2164 *
2165 * Standard debug practice is to run the fbcon setup without taking the
2166 * console_lock as a hack, to be able to see backtraces and crashes on the
2167 * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel
2168 * cmdline option.
2169 *
2170 * The other option is to just disable fbdev emulation since very likely the
2171 * first modeset from userspace will crash in the same way, and is even easier
2172 * to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0
2173 * kernel cmdline option.
2174 *
2175 * RETURNS:
2176 * Zero if everything went ok, nonzero otherwise.
2177 */
2178int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
2179{
2180 int ret;
2181
2182 if (!drm_fbdev_emulation)
2183 return 0;
2184
2185 mutex_lock(&fb_helper->lock);
2186 ret = __drm_fb_helper_initial_config_and_unlock(fb_helper, bpp_sel);
2187
2188 return ret;
2189}
2190EXPORT_SYMBOL(drm_fb_helper_initial_config);
2191
2192/**
2193 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
2194 * probing all the outputs attached to the fb
2195 * @fb_helper: driver-allocated fbdev helper, can be NULL
2196 *
2197 * Scan the connectors attached to the fb_helper and try to put together a
2198 * setup after notification of a change in output configuration.
2199 *
2200 * Called at runtime, takes the mode config locks to be able to check/change the
2201 * modeset configuration. Must be run from process context (which usually means
2202 * either the output polling work or a work item launched from the driver's
2203 * hotplug interrupt).
2204 *
2205 * Note that drivers may call this even before calling
2206 * drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows
2207 * for a race-free fbcon setup and will make sure that the fbdev emulation will
2208 * not miss any hotplug events.
2209 *
2210 * RETURNS:
2211 * 0 on success and a non-zero error code otherwise.
2212 */
2213int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
2214{
2215 int err = 0;
2216
2217 if (!drm_fbdev_emulation || !fb_helper)
2218 return 0;
2219
2220 mutex_lock(&fb_helper->lock);
2221 if (fb_helper->deferred_setup) {
2222 err = __drm_fb_helper_initial_config_and_unlock(fb_helper,
2223 fb_helper->preferred_bpp);
2224 return err;
2225 }
2226
2227 if (!fb_helper->fb || !drm_master_internal_acquire(fb_helper->dev)) {
2228 fb_helper->delayed_hotplug = true;
2229 mutex_unlock(&fb_helper->lock);
2230 return err;
2231 }
2232
2233 drm_master_internal_release(fb_helper->dev);
2234
2235 drm_dbg_kms(fb_helper->dev, "\n");
2236
2237 drm_client_modeset_probe(&fb_helper->client, fb_helper->fb->width, fb_helper->fb->height);
2238 drm_setup_crtcs_fb(fb_helper);
2239 mutex_unlock(&fb_helper->lock);
2240
2241 drm_fb_helper_set_par(fb_helper->info);
2242
2243 return 0;
2244}
2245EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
2246
2247/**
2248 * drm_fb_helper_lastclose - DRM driver lastclose helper for fbdev emulation
2249 * @dev: DRM device
2250 *
2251 * This function can be used as the &drm_driver->lastclose callback for drivers
2252 * that only need to call drm_fb_helper_restore_fbdev_mode_unlocked().
2253 */
2254void drm_fb_helper_lastclose(struct drm_device *dev)
2255{
2256 drm_fb_helper_restore_fbdev_mode_unlocked(dev->fb_helper);
2257}
2258EXPORT_SYMBOL(drm_fb_helper_lastclose);
2259
2260/**
2261 * drm_fb_helper_output_poll_changed - DRM mode config \.output_poll_changed
2262 * helper for fbdev emulation
2263 * @dev: DRM device
2264 *
2265 * This function can be used as the
2266 * &drm_mode_config_funcs.output_poll_changed callback for drivers that only
2267 * need to call drm_fbdev.hotplug_event().
2268 */
2269void drm_fb_helper_output_poll_changed(struct drm_device *dev)
2270{
2271 drm_fb_helper_hotplug_event(dev->fb_helper);
2272}
2273EXPORT_SYMBOL(drm_fb_helper_output_poll_changed);