2 * Copyright (c) 2006-2009 Red Hat Inc.
3 * Copyright (c) 2006-2008 Intel Corporation
4 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
6 * DRM framebuffer helper functions
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.
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
27 * Dave Airlie <airlied@linux.ie>
28 * Jesse Barnes <jesse.barnes@intel.com>
30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
32 #include <linux/kernel.h>
33 #include <linux/sysrq.h>
34 #include <linux/slab.h>
36 #include <linux/module.h>
38 #include <drm/drm_crtc.h>
39 #include <drm/drm_fb_helper.h>
40 #include <drm/drm_crtc_helper.h>
42 static LIST_HEAD(kernel_fb_helper_list);
47 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
48 * mode setting driver. They can be used mostly independantely from the crtc
49 * helper functions used by many drivers to implement the kernel mode setting
52 * Initialization is done as a three-step process with drm_fb_helper_init(),
53 * drm_fb_helper_single_add_all_connectors() and drm_fb_helper_initial_config().
54 * Drivers with fancier requirements than the default beheviour can override the
55 * second step with their own code. Teardown is done with drm_fb_helper_fini().
57 * At runtime drivers should restore the fbdev console by calling
58 * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
59 * should also notify the fb helper code from updates to the output
60 * configuration by calling drm_fb_helper_hotplug_event(). For easier
61 * integration with the output polling code in drm_crtc_helper.c the modeset
62 * code proves a ->output_poll_changed callback.
64 * All other functions exported by the fb helper library can be used to
65 * implement the fbdev driver interface by the driver.
69 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
71 * @fb_helper: fbdev initialized with drm_fb_helper_init
73 * This functions adds all the available connectors for use with the given
74 * fb_helper. This is a separate step to allow drivers to freely assign
75 * connectors to the fbdev, e.g. if some are reserved for special purposes or
76 * not adequate to be used for the fbcon.
78 * Since this is part of the initial setup before the fbdev is published, no
79 * locking is required.
81 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
83 struct drm_device *dev = fb_helper->dev;
84 struct drm_connector *connector;
87 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
88 struct drm_fb_helper_connector *fb_helper_connector;
90 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
91 if (!fb_helper_connector)
94 fb_helper_connector->connector = connector;
95 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
99 for (i = 0; i < fb_helper->connector_count; i++) {
100 kfree(fb_helper->connector_info[i]);
101 fb_helper->connector_info[i] = NULL;
103 fb_helper->connector_count = 0;
106 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
108 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
110 struct drm_fb_helper_connector *fb_helper_conn;
113 for (i = 0; i < fb_helper->connector_count; i++) {
114 struct drm_cmdline_mode *mode;
115 struct drm_connector *connector;
118 fb_helper_conn = fb_helper->connector_info[i];
119 connector = fb_helper_conn->connector;
120 mode = &fb_helper_conn->cmdline_mode;
122 /* do something on return - turn off connector maybe */
123 if (fb_get_options(drm_get_connector_name(connector), &option))
126 if (drm_mode_parse_command_line_for_connector(option,
131 switch (mode->force) {
135 case DRM_FORCE_ON_DIGITAL:
144 DRM_INFO("forcing %s connector %s\n",
145 drm_get_connector_name(connector), s);
146 connector->force = mode->force;
149 DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
150 drm_get_connector_name(connector),
151 mode->xres, mode->yres,
152 mode->refresh_specified ? mode->refresh : 60,
153 mode->rb ? " reduced blanking" : "",
154 mode->margins ? " with margins" : "",
155 mode->interlace ? " interlaced" : "");
162 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
164 uint16_t *r_base, *g_base, *b_base;
167 if (helper->funcs->gamma_get == NULL)
170 r_base = crtc->gamma_store;
171 g_base = r_base + crtc->gamma_size;
172 b_base = g_base + crtc->gamma_size;
174 for (i = 0; i < crtc->gamma_size; i++)
175 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
178 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
180 uint16_t *r_base, *g_base, *b_base;
182 if (crtc->funcs->gamma_set == NULL)
185 r_base = crtc->gamma_store;
186 g_base = r_base + crtc->gamma_size;
187 b_base = g_base + crtc->gamma_size;
189 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
193 * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
194 * @info: fbdev registered by the helper
196 int drm_fb_helper_debug_enter(struct fb_info *info)
198 struct drm_fb_helper *helper = info->par;
199 struct drm_crtc_helper_funcs *funcs;
202 if (list_empty(&kernel_fb_helper_list))
205 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
206 for (i = 0; i < helper->crtc_count; i++) {
207 struct drm_mode_set *mode_set =
208 &helper->crtc_info[i].mode_set;
210 if (!mode_set->crtc->enabled)
213 funcs = mode_set->crtc->helper_private;
214 drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
215 funcs->mode_set_base_atomic(mode_set->crtc,
219 ENTER_ATOMIC_MODE_SET);
225 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
227 /* Find the real fb for a given fb helper CRTC */
228 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
230 struct drm_device *dev = crtc->dev;
233 list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
234 if (crtc->base.id == c->base.id)
242 * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
243 * @info: fbdev registered by the helper
245 int drm_fb_helper_debug_leave(struct fb_info *info)
247 struct drm_fb_helper *helper = info->par;
248 struct drm_crtc *crtc;
249 struct drm_crtc_helper_funcs *funcs;
250 struct drm_framebuffer *fb;
253 for (i = 0; i < helper->crtc_count; i++) {
254 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
255 crtc = mode_set->crtc;
256 funcs = crtc->helper_private;
257 fb = drm_mode_config_fb(crtc);
263 DRM_ERROR("no fb to restore??\n");
267 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
268 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
269 crtc->y, LEAVE_ATOMIC_MODE_SET);
274 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
277 * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
278 * @fb_helper: fbcon to restore
280 * This should be called from driver's drm ->lastclose callback
281 * when implementing an fbcon on top of kms using this helper. This ensures that
282 * the user isn't greeted with a black screen when e.g. X dies.
284 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
286 struct drm_device *dev = fb_helper->dev;
287 struct drm_plane *plane;
291 drm_warn_on_modeset_not_all_locked(dev);
293 list_for_each_entry(plane, &dev->mode_config.plane_list, head)
294 drm_plane_force_disable(plane);
296 for (i = 0; i < fb_helper->crtc_count; i++) {
297 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
298 struct drm_crtc *crtc = mode_set->crtc;
301 if (crtc->funcs->cursor_set) {
302 ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
307 ret = drm_mode_set_config_internal(mode_set);
313 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
316 * restore fbcon display for all kms driver's using this helper, used for sysrq
317 * and panic handling.
319 static bool drm_fb_helper_force_kernel_mode(void)
321 bool ret, error = false;
322 struct drm_fb_helper *helper;
324 if (list_empty(&kernel_fb_helper_list))
327 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
328 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF)
331 ret = drm_fb_helper_restore_fbdev_mode(helper);
338 static int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
342 * It's a waste of time and effort to switch back to text console
343 * if the kernel should reboot before panic messages can be seen.
345 if (panic_timeout < 0)
348 pr_err("panic occurred, switching back to text console\n");
349 return drm_fb_helper_force_kernel_mode();
352 static struct notifier_block paniced = {
353 .notifier_call = drm_fb_helper_panic,
356 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
358 struct drm_device *dev = fb_helper->dev;
359 struct drm_crtc *crtc;
360 int bound = 0, crtcs_bound = 0;
362 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
365 if (crtc->fb == fb_helper->fb)
369 if (bound < crtcs_bound)
374 #ifdef CONFIG_MAGIC_SYSRQ
375 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
378 ret = drm_fb_helper_force_kernel_mode();
380 DRM_ERROR("Failed to restore crtc configuration\n");
382 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
384 static void drm_fb_helper_sysrq(int dummy1)
386 schedule_work(&drm_fb_helper_restore_work);
389 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
390 .handler = drm_fb_helper_sysrq,
391 .help_msg = "force-fb(V)",
392 .action_msg = "Restore framebuffer console",
395 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
398 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
400 struct drm_fb_helper *fb_helper = info->par;
401 struct drm_device *dev = fb_helper->dev;
402 struct drm_crtc *crtc;
403 struct drm_connector *connector;
407 * fbdev->blank can be called from irq context in case of a panic.
408 * Since we already have our own special panic handler which will
409 * restore the fbdev console mode completely, just bail out early.
411 if (oops_in_progress)
415 * fbdev->blank can be called from irq context in case of a panic.
416 * Since we already have our own special panic handler which will
417 * restore the fbdev console mode completely, just bail out early.
419 if (oops_in_progress)
423 * For each CRTC in this fb, turn the connectors on/off.
425 drm_modeset_lock_all(dev);
426 if (!drm_fb_helper_is_bound(fb_helper)) {
427 drm_modeset_unlock_all(dev);
431 for (i = 0; i < fb_helper->crtc_count; i++) {
432 crtc = fb_helper->crtc_info[i].mode_set.crtc;
437 /* Walk the connectors & encoders on this fb turning them on/off */
438 for (j = 0; j < fb_helper->connector_count; j++) {
439 connector = fb_helper->connector_info[j]->connector;
440 connector->funcs->dpms(connector, dpms_mode);
441 drm_object_property_set_value(&connector->base,
442 dev->mode_config.dpms_property, dpms_mode);
445 drm_modeset_unlock_all(dev);
449 * drm_fb_helper_blank - implementation for ->fb_blank
450 * @blank: desired blanking state
451 * @info: fbdev registered by the helper
453 int drm_fb_helper_blank(int blank, struct fb_info *info)
456 /* Display: On; HSync: On, VSync: On */
457 case FB_BLANK_UNBLANK:
458 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
460 /* Display: Off; HSync: On, VSync: On */
461 case FB_BLANK_NORMAL:
462 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
464 /* Display: Off; HSync: Off, VSync: On */
465 case FB_BLANK_HSYNC_SUSPEND:
466 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
468 /* Display: Off; HSync: On, VSync: Off */
469 case FB_BLANK_VSYNC_SUSPEND:
470 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
472 /* Display: Off; HSync: Off, VSync: Off */
473 case FB_BLANK_POWERDOWN:
474 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
479 EXPORT_SYMBOL(drm_fb_helper_blank);
481 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
485 for (i = 0; i < helper->connector_count; i++)
486 kfree(helper->connector_info[i]);
487 kfree(helper->connector_info);
488 for (i = 0; i < helper->crtc_count; i++) {
489 kfree(helper->crtc_info[i].mode_set.connectors);
490 if (helper->crtc_info[i].mode_set.mode)
491 drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
493 kfree(helper->crtc_info);
497 * drm_fb_helper_init - initialize a drm_fb_helper structure
499 * @fb_helper: driver-allocated fbdev helper structure to initialize
500 * @crtc_count: maximum number of crtcs to support in this fbdev emulation
501 * @max_conn_count: max connector count
503 * This allocates the structures for the fbdev helper with the given limits.
504 * Note that this won't yet touch the hardware (through the driver interfaces)
505 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
506 * to allow driver writes more control over the exact init sequence.
508 * Drivers must set fb_helper->funcs before calling
509 * drm_fb_helper_initial_config().
512 * Zero if everything went ok, nonzero otherwise.
514 int drm_fb_helper_init(struct drm_device *dev,
515 struct drm_fb_helper *fb_helper,
516 int crtc_count, int max_conn_count)
518 struct drm_crtc *crtc;
521 fb_helper->dev = dev;
523 INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
525 fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
526 if (!fb_helper->crtc_info)
529 fb_helper->crtc_count = crtc_count;
530 fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
531 if (!fb_helper->connector_info) {
532 kfree(fb_helper->crtc_info);
535 fb_helper->connector_count = 0;
537 for (i = 0; i < crtc_count; i++) {
538 fb_helper->crtc_info[i].mode_set.connectors =
539 kcalloc(max_conn_count,
540 sizeof(struct drm_connector *),
543 if (!fb_helper->crtc_info[i].mode_set.connectors)
545 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
549 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
550 fb_helper->crtc_info[i].mode_set.crtc = crtc;
556 drm_fb_helper_crtc_free(fb_helper);
559 EXPORT_SYMBOL(drm_fb_helper_init);
561 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
563 if (!list_empty(&fb_helper->kernel_fb_list)) {
564 list_del(&fb_helper->kernel_fb_list);
565 if (list_empty(&kernel_fb_helper_list)) {
566 pr_info("drm: unregistered panic notifier\n");
567 atomic_notifier_chain_unregister(&panic_notifier_list,
569 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
573 drm_fb_helper_crtc_free(fb_helper);
576 EXPORT_SYMBOL(drm_fb_helper_fini);
578 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
579 u16 blue, u16 regno, struct fb_info *info)
581 struct drm_fb_helper *fb_helper = info->par;
582 struct drm_framebuffer *fb = fb_helper->fb;
585 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
588 /* place color in psuedopalette */
591 palette = (u32 *)info->pseudo_palette;
592 red >>= (16 - info->var.red.length);
593 green >>= (16 - info->var.green.length);
594 blue >>= (16 - info->var.blue.length);
595 value = (red << info->var.red.offset) |
596 (green << info->var.green.offset) |
597 (blue << info->var.blue.offset);
598 if (info->var.transp.length > 0) {
599 u32 mask = (1 << info->var.transp.length) - 1;
600 mask <<= info->var.transp.offset;
603 palette[regno] = value;
608 * The driver really shouldn't advertise pseudo/directcolor
609 * visuals if it can't deal with the palette.
611 if (WARN_ON(!fb_helper->funcs->gamma_set ||
612 !fb_helper->funcs->gamma_get))
617 if (fb->bits_per_pixel == 16) {
620 if (fb->depth == 16 && regno > 63)
622 if (fb->depth == 15 && regno > 31)
625 if (fb->depth == 16) {
629 for (i = 0; i < 8; i++)
630 fb_helper->funcs->gamma_set(crtc, red,
631 green, blue, pindex + i);
634 fb_helper->funcs->gamma_get(crtc, &r,
638 for (i = 0; i < 4; i++)
639 fb_helper->funcs->gamma_set(crtc, r,
646 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
651 * drm_fb_helper_setcmap - implementation for ->fb_setcmap
653 * @info: fbdev registered by the helper
655 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
657 struct drm_fb_helper *fb_helper = info->par;
658 struct drm_device *dev = fb_helper->dev;
659 struct drm_crtc_helper_funcs *crtc_funcs;
660 u16 *red, *green, *blue, *transp;
661 struct drm_crtc *crtc;
665 drm_modeset_lock_all(dev);
666 if (!drm_fb_helper_is_bound(fb_helper)) {
667 drm_modeset_unlock_all(dev);
671 for (i = 0; i < fb_helper->crtc_count; i++) {
672 crtc = fb_helper->crtc_info[i].mode_set.crtc;
673 crtc_funcs = crtc->helper_private;
678 transp = cmap->transp;
681 for (j = 0; j < cmap->len; j++) {
682 u16 hred, hgreen, hblue, htransp = 0xffff;
691 rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
695 if (crtc_funcs->load_lut)
696 crtc_funcs->load_lut(crtc);
699 drm_modeset_unlock_all(dev);
702 EXPORT_SYMBOL(drm_fb_helper_setcmap);
705 * drm_fb_helper_check_var - implementation for ->fb_check_var
706 * @var: screeninfo to check
707 * @info: fbdev registered by the helper
709 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
710 struct fb_info *info)
712 struct drm_fb_helper *fb_helper = info->par;
713 struct drm_framebuffer *fb = fb_helper->fb;
716 if (var->pixclock != 0 || in_dbg_master())
719 /* Need to resize the fb object !!! */
720 if (var->bits_per_pixel > fb->bits_per_pixel ||
721 var->xres > fb->width || var->yres > fb->height ||
722 var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
723 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
724 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
725 var->xres, var->yres, var->bits_per_pixel,
726 var->xres_virtual, var->yres_virtual,
727 fb->width, fb->height, fb->bits_per_pixel);
731 switch (var->bits_per_pixel) {
733 depth = (var->green.length == 6) ? 16 : 15;
736 depth = (var->transp.length > 0) ? 32 : 24;
739 depth = var->bits_per_pixel;
746 var->green.offset = 0;
747 var->blue.offset = 0;
749 var->green.length = 8;
750 var->blue.length = 8;
751 var->transp.length = 0;
752 var->transp.offset = 0;
755 var->red.offset = 10;
756 var->green.offset = 5;
757 var->blue.offset = 0;
759 var->green.length = 5;
760 var->blue.length = 5;
761 var->transp.length = 1;
762 var->transp.offset = 15;
765 var->red.offset = 11;
766 var->green.offset = 5;
767 var->blue.offset = 0;
769 var->green.length = 6;
770 var->blue.length = 5;
771 var->transp.length = 0;
772 var->transp.offset = 0;
775 var->red.offset = 16;
776 var->green.offset = 8;
777 var->blue.offset = 0;
779 var->green.length = 8;
780 var->blue.length = 8;
781 var->transp.length = 0;
782 var->transp.offset = 0;
785 var->red.offset = 16;
786 var->green.offset = 8;
787 var->blue.offset = 0;
789 var->green.length = 8;
790 var->blue.length = 8;
791 var->transp.length = 8;
792 var->transp.offset = 24;
799 EXPORT_SYMBOL(drm_fb_helper_check_var);
802 * drm_fb_helper_set_par - implementation for ->fb_set_par
803 * @info: fbdev registered by the helper
805 * This will let fbcon do the mode init and is called at initialization time by
806 * the fbdev core when registering the driver, and later on through the hotplug
809 int drm_fb_helper_set_par(struct fb_info *info)
811 struct drm_fb_helper *fb_helper = info->par;
812 struct drm_device *dev = fb_helper->dev;
813 struct fb_var_screeninfo *var = &info->var;
817 if (var->pixclock != 0) {
818 DRM_ERROR("PIXEL CLOCK SET\n");
822 drm_modeset_lock_all(dev);
823 for (i = 0; i < fb_helper->crtc_count; i++) {
824 ret = drm_mode_set_config_internal(&fb_helper->crtc_info[i].mode_set);
826 drm_modeset_unlock_all(dev);
830 drm_modeset_unlock_all(dev);
832 if (fb_helper->delayed_hotplug) {
833 fb_helper->delayed_hotplug = false;
834 drm_fb_helper_hotplug_event(fb_helper);
838 EXPORT_SYMBOL(drm_fb_helper_set_par);
841 * drm_fb_helper_pan_display - implementation for ->fb_pan_display
842 * @var: updated screen information
843 * @info: fbdev registered by the helper
845 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
846 struct fb_info *info)
848 struct drm_fb_helper *fb_helper = info->par;
849 struct drm_device *dev = fb_helper->dev;
850 struct drm_mode_set *modeset;
854 drm_modeset_lock_all(dev);
855 if (!drm_fb_helper_is_bound(fb_helper)) {
856 drm_modeset_unlock_all(dev);
860 for (i = 0; i < fb_helper->crtc_count; i++) {
861 modeset = &fb_helper->crtc_info[i].mode_set;
863 modeset->x = var->xoffset;
864 modeset->y = var->yoffset;
866 if (modeset->num_connectors) {
867 ret = drm_mode_set_config_internal(modeset);
869 info->var.xoffset = var->xoffset;
870 info->var.yoffset = var->yoffset;
874 drm_modeset_unlock_all(dev);
877 EXPORT_SYMBOL(drm_fb_helper_pan_display);
880 * Allocates the backing storage and sets up the fbdev info structure through
881 * the ->fb_probe callback and then registers the fbdev and sets up the panic
884 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
890 struct fb_info *info;
891 struct drm_fb_helper_surface_size sizes;
894 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
895 sizes.surface_depth = 24;
896 sizes.surface_bpp = 32;
897 sizes.fb_width = (unsigned)-1;
898 sizes.fb_height = (unsigned)-1;
900 /* if driver picks 8 or 16 by default use that
901 for both depth/bpp */
902 if (preferred_bpp != sizes.surface_bpp)
903 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
905 /* first up get a count of crtcs now in use and new min/maxes width/heights */
906 for (i = 0; i < fb_helper->connector_count; i++) {
907 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
908 struct drm_cmdline_mode *cmdline_mode;
910 cmdline_mode = &fb_helper_conn->cmdline_mode;
912 if (cmdline_mode->bpp_specified) {
913 switch (cmdline_mode->bpp) {
915 sizes.surface_depth = sizes.surface_bpp = 8;
918 sizes.surface_depth = 15;
919 sizes.surface_bpp = 16;
922 sizes.surface_depth = sizes.surface_bpp = 16;
925 sizes.surface_depth = sizes.surface_bpp = 24;
928 sizes.surface_depth = 24;
929 sizes.surface_bpp = 32;
937 for (i = 0; i < fb_helper->crtc_count; i++) {
938 struct drm_display_mode *desired_mode;
939 desired_mode = fb_helper->crtc_info[i].desired_mode;
943 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
944 if (desired_mode->hdisplay < sizes.fb_width)
945 sizes.fb_width = desired_mode->hdisplay;
946 if (desired_mode->vdisplay < sizes.fb_height)
947 sizes.fb_height = desired_mode->vdisplay;
948 if (desired_mode->hdisplay > sizes.surface_width)
949 sizes.surface_width = desired_mode->hdisplay;
950 if (desired_mode->vdisplay > sizes.surface_height)
951 sizes.surface_height = desired_mode->vdisplay;
956 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
957 /* hmm everyone went away - assume VGA cable just fell out
958 and will come back later. */
959 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
960 sizes.fb_width = sizes.surface_width = 1024;
961 sizes.fb_height = sizes.surface_height = 768;
964 /* push down into drivers */
965 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
969 info = fb_helper->fbdev;
972 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
973 * events, but at init time drm_setup_crtcs needs to be called before
974 * the fb is allocated (since we need to figure out the desired size of
975 * the fb before we can allocate it ...). Hence we need to fix things up
978 for (i = 0; i < fb_helper->crtc_count; i++)
979 if (fb_helper->crtc_info[i].mode_set.num_connectors)
980 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
983 info->var.pixclock = 0;
984 if (register_framebuffer(info) < 0)
987 dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
988 info->node, info->fix.id);
990 /* Switch back to kernel console on panic */
991 /* multi card linked list maybe */
992 if (list_empty(&kernel_fb_helper_list)) {
993 dev_info(fb_helper->dev->dev, "registered panic notifier\n");
994 atomic_notifier_chain_register(&panic_notifier_list,
996 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
999 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1005 * drm_fb_helper_fill_fix - initializes fixed fbdev information
1006 * @info: fbdev registered by the helper
1007 * @pitch: desired pitch
1008 * @depth: desired depth
1010 * Helper to fill in the fixed fbdev information useful for a non-accelerated
1011 * fbdev emulations. Drivers which support acceleration methods which impose
1012 * additional constraints need to set up their own limits.
1014 * Drivers should call this (or their equivalent setup code) from their
1015 * ->fb_probe callback.
1017 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1020 info->fix.type = FB_TYPE_PACKED_PIXELS;
1021 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1022 FB_VISUAL_TRUECOLOR;
1023 info->fix.mmio_start = 0;
1024 info->fix.mmio_len = 0;
1025 info->fix.type_aux = 0;
1026 info->fix.xpanstep = 1; /* doing it in hw */
1027 info->fix.ypanstep = 1; /* doing it in hw */
1028 info->fix.ywrapstep = 0;
1029 info->fix.accel = FB_ACCEL_NONE;
1030 info->fix.type_aux = 0;
1032 info->fix.line_length = pitch;
1035 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1038 * drm_fb_helper_fill_var - initalizes variable fbdev information
1039 * @info: fbdev instance to set up
1040 * @fb_helper: fb helper instance to use as template
1041 * @fb_width: desired fb width
1042 * @fb_height: desired fb height
1044 * Sets up the variable fbdev metainformation from the given fb helper instance
1045 * and the drm framebuffer allocated in fb_helper->fb.
1047 * Drivers should call this (or their equivalent setup code) from their
1048 * ->fb_probe callback after having allocated the fbdev backing
1049 * storage framebuffer.
1051 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1052 uint32_t fb_width, uint32_t fb_height)
1054 struct drm_framebuffer *fb = fb_helper->fb;
1055 info->pseudo_palette = fb_helper->pseudo_palette;
1056 info->var.xres_virtual = fb->width;
1057 info->var.yres_virtual = fb->height;
1058 info->var.bits_per_pixel = fb->bits_per_pixel;
1059 info->var.accel_flags = FB_ACCELF_TEXT;
1060 info->var.xoffset = 0;
1061 info->var.yoffset = 0;
1062 info->var.activate = FB_ACTIVATE_NOW;
1063 info->var.height = -1;
1064 info->var.width = -1;
1066 switch (fb->depth) {
1068 info->var.red.offset = 0;
1069 info->var.green.offset = 0;
1070 info->var.blue.offset = 0;
1071 info->var.red.length = 8; /* 8bit DAC */
1072 info->var.green.length = 8;
1073 info->var.blue.length = 8;
1074 info->var.transp.offset = 0;
1075 info->var.transp.length = 0;
1078 info->var.red.offset = 10;
1079 info->var.green.offset = 5;
1080 info->var.blue.offset = 0;
1081 info->var.red.length = 5;
1082 info->var.green.length = 5;
1083 info->var.blue.length = 5;
1084 info->var.transp.offset = 15;
1085 info->var.transp.length = 1;
1088 info->var.red.offset = 11;
1089 info->var.green.offset = 5;
1090 info->var.blue.offset = 0;
1091 info->var.red.length = 5;
1092 info->var.green.length = 6;
1093 info->var.blue.length = 5;
1094 info->var.transp.offset = 0;
1097 info->var.red.offset = 16;
1098 info->var.green.offset = 8;
1099 info->var.blue.offset = 0;
1100 info->var.red.length = 8;
1101 info->var.green.length = 8;
1102 info->var.blue.length = 8;
1103 info->var.transp.offset = 0;
1104 info->var.transp.length = 0;
1107 info->var.red.offset = 16;
1108 info->var.green.offset = 8;
1109 info->var.blue.offset = 0;
1110 info->var.red.length = 8;
1111 info->var.green.length = 8;
1112 info->var.blue.length = 8;
1113 info->var.transp.offset = 24;
1114 info->var.transp.length = 8;
1120 info->var.xres = fb_width;
1121 info->var.yres = fb_height;
1123 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1125 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1129 struct drm_connector *connector;
1133 for (i = 0; i < fb_helper->connector_count; i++) {
1134 connector = fb_helper->connector_info[i]->connector;
1135 count += connector->funcs->fill_modes(connector, maxX, maxY);
1141 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1143 struct drm_display_mode *mode;
1145 list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1146 if (drm_mode_width(mode) > width ||
1147 drm_mode_height(mode) > height)
1149 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1155 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1157 struct drm_cmdline_mode *cmdline_mode;
1158 cmdline_mode = &fb_connector->cmdline_mode;
1159 return cmdline_mode->specified;
1162 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1163 int width, int height)
1165 struct drm_cmdline_mode *cmdline_mode;
1166 struct drm_display_mode *mode = NULL;
1168 cmdline_mode = &fb_helper_conn->cmdline_mode;
1169 if (cmdline_mode->specified == false)
1172 /* attempt to find a matching mode in the list of modes
1173 * we have gotten so far, if not add a CVT mode that conforms
1175 if (cmdline_mode->rb || cmdline_mode->margins)
1178 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1179 /* check width/height */
1180 if (mode->hdisplay != cmdline_mode->xres ||
1181 mode->vdisplay != cmdline_mode->yres)
1184 if (cmdline_mode->refresh_specified) {
1185 if (mode->vrefresh != cmdline_mode->refresh)
1189 if (cmdline_mode->interlace) {
1190 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1197 mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1199 list_add(&mode->head, &fb_helper_conn->connector->modes);
1203 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1208 enable = connector->status == connector_status_connected;
1210 enable = connector->status != connector_status_disconnected;
1215 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1218 bool any_enabled = false;
1219 struct drm_connector *connector;
1222 for (i = 0; i < fb_helper->connector_count; i++) {
1223 connector = fb_helper->connector_info[i]->connector;
1224 enabled[i] = drm_connector_enabled(connector, true);
1225 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1226 enabled[i] ? "yes" : "no");
1227 any_enabled |= enabled[i];
1233 for (i = 0; i < fb_helper->connector_count; i++) {
1234 connector = fb_helper->connector_info[i]->connector;
1235 enabled[i] = drm_connector_enabled(connector, false);
1239 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1240 struct drm_display_mode **modes,
1241 bool *enabled, int width, int height)
1244 bool can_clone = false;
1245 struct drm_fb_helper_connector *fb_helper_conn;
1246 struct drm_display_mode *dmt_mode, *mode;
1248 /* only contemplate cloning in the single crtc case */
1249 if (fb_helper->crtc_count > 1)
1253 for (i = 0; i < fb_helper->connector_count; i++) {
1258 /* only contemplate cloning if more than one connector is enabled */
1262 /* check the command line or if nothing common pick 1024x768 */
1264 for (i = 0; i < fb_helper->connector_count; i++) {
1267 fb_helper_conn = fb_helper->connector_info[i];
1268 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1273 for (j = 0; j < i; j++) {
1276 if (!drm_mode_equal(modes[j], modes[i]))
1282 DRM_DEBUG_KMS("can clone using command line\n");
1286 /* try and find a 1024x768 mode on each connector */
1288 dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1290 for (i = 0; i < fb_helper->connector_count; i++) {
1295 fb_helper_conn = fb_helper->connector_info[i];
1296 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1297 if (drm_mode_equal(mode, dmt_mode))
1305 DRM_DEBUG_KMS("can clone using 1024x768\n");
1308 DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1312 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1313 struct drm_display_mode **modes,
1314 bool *enabled, int width, int height)
1316 struct drm_fb_helper_connector *fb_helper_conn;
1319 for (i = 0; i < fb_helper->connector_count; i++) {
1320 fb_helper_conn = fb_helper->connector_info[i];
1322 if (enabled[i] == false)
1325 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1326 fb_helper_conn->connector->base.id);
1328 /* got for command line mode first */
1329 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1331 DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1332 fb_helper_conn->connector->base.id);
1333 modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1335 /* No preferred modes, pick one off the list */
1336 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1337 list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1340 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1346 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1347 struct drm_fb_helper_crtc **best_crtcs,
1348 struct drm_display_mode **modes,
1349 int n, int width, int height)
1352 struct drm_device *dev = fb_helper->dev;
1353 struct drm_connector *connector;
1354 struct drm_connector_helper_funcs *connector_funcs;
1355 struct drm_encoder *encoder;
1356 int my_score, best_score, score;
1357 struct drm_fb_helper_crtc **crtcs, *crtc;
1358 struct drm_fb_helper_connector *fb_helper_conn;
1360 if (n == fb_helper->connector_count)
1363 fb_helper_conn = fb_helper->connector_info[n];
1364 connector = fb_helper_conn->connector;
1366 best_crtcs[n] = NULL;
1367 best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1368 if (modes[n] == NULL)
1371 crtcs = kzalloc(dev->mode_config.num_connector *
1372 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1377 if (connector->status == connector_status_connected)
1379 if (drm_has_cmdline_mode(fb_helper_conn))
1381 if (drm_has_preferred_mode(fb_helper_conn, width, height))
1384 connector_funcs = connector->helper_private;
1385 encoder = connector_funcs->best_encoder(connector);
1389 /* select a crtc for this connector and then attempt to configure
1390 remaining connectors */
1391 for (c = 0; c < fb_helper->crtc_count; c++) {
1392 crtc = &fb_helper->crtc_info[c];
1394 if ((encoder->possible_crtcs & (1 << c)) == 0)
1397 for (o = 0; o < n; o++)
1398 if (best_crtcs[o] == crtc)
1402 /* ignore cloning unless only a single crtc */
1403 if (fb_helper->crtc_count > 1)
1406 if (!drm_mode_equal(modes[o], modes[n]))
1411 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1412 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1414 if (score > best_score) {
1416 memcpy(best_crtcs, crtcs,
1417 dev->mode_config.num_connector *
1418 sizeof(struct drm_fb_helper_crtc *));
1426 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1428 struct drm_device *dev = fb_helper->dev;
1429 struct drm_fb_helper_crtc **crtcs;
1430 struct drm_display_mode **modes;
1431 struct drm_mode_set *modeset;
1436 DRM_DEBUG_KMS("\n");
1438 width = dev->mode_config.max_width;
1439 height = dev->mode_config.max_height;
1441 crtcs = kcalloc(dev->mode_config.num_connector,
1442 sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1443 modes = kcalloc(dev->mode_config.num_connector,
1444 sizeof(struct drm_display_mode *), GFP_KERNEL);
1445 enabled = kcalloc(dev->mode_config.num_connector,
1446 sizeof(bool), GFP_KERNEL);
1447 if (!crtcs || !modes || !enabled) {
1448 DRM_ERROR("Memory allocation failed\n");
1453 drm_enable_connectors(fb_helper, enabled);
1455 if (!(fb_helper->funcs->initial_config &&
1456 fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1457 enabled, width, height))) {
1458 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1459 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1461 if (!drm_target_cloned(fb_helper,
1462 modes, enabled, width, height) &&
1463 !drm_target_preferred(fb_helper,
1464 modes, enabled, width, height))
1465 DRM_ERROR("Unable to find initial modes\n");
1467 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1470 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1473 /* need to set the modesets up here for use later */
1474 /* fill out the connector<->crtc mappings into the modesets */
1475 for (i = 0; i < fb_helper->crtc_count; i++) {
1476 modeset = &fb_helper->crtc_info[i].mode_set;
1477 modeset->num_connectors = 0;
1481 for (i = 0; i < fb_helper->connector_count; i++) {
1482 struct drm_display_mode *mode = modes[i];
1483 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1484 modeset = &fb_crtc->mode_set;
1486 if (mode && fb_crtc) {
1487 DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1488 mode->name, fb_crtc->mode_set.crtc->base.id);
1489 fb_crtc->desired_mode = mode;
1491 drm_mode_destroy(dev, modeset->mode);
1492 modeset->mode = drm_mode_duplicate(dev,
1493 fb_crtc->desired_mode);
1494 modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1495 modeset->fb = fb_helper->fb;
1499 /* Clear out any old modes if there are no more connected outputs. */
1500 for (i = 0; i < fb_helper->crtc_count; i++) {
1501 modeset = &fb_helper->crtc_info[i].mode_set;
1502 if (modeset->num_connectors == 0) {
1503 BUG_ON(modeset->fb);
1504 BUG_ON(modeset->num_connectors);
1506 drm_mode_destroy(dev, modeset->mode);
1507 modeset->mode = NULL;
1517 * drm_fb_helper_initial_config - setup a sane initial connector configuration
1518 * @fb_helper: fb_helper device struct
1519 * @bpp_sel: bpp value to use for the framebuffer configuration
1521 * Scans the CRTCs and connectors and tries to put together an initial setup.
1522 * At the moment, this is a cloned configuration across all heads with
1523 * a new framebuffer object as the backing store.
1525 * Note that this also registers the fbdev and so allows userspace to call into
1526 * the driver through the fbdev interfaces.
1528 * This function will call down into the ->fb_probe callback to let
1529 * the driver allocate and initialize the fbdev info structure and the drm
1530 * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1531 * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1532 * values for the fbdev info structure.
1535 * Zero if everything went ok, nonzero otherwise.
1537 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1539 struct drm_device *dev = fb_helper->dev;
1542 drm_fb_helper_parse_command_line(fb_helper);
1544 count = drm_fb_helper_probe_connector_modes(fb_helper,
1545 dev->mode_config.max_width,
1546 dev->mode_config.max_height);
1548 * we shouldn't end up with no modes here.
1551 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1553 drm_setup_crtcs(fb_helper);
1555 return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1557 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1560 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1561 * probing all the outputs attached to the fb
1562 * @fb_helper: the drm_fb_helper
1564 * Scan the connectors attached to the fb_helper and try to put together a
1565 * setup after *notification of a change in output configuration.
1567 * Called at runtime, takes the mode config locks to be able to check/change the
1568 * modeset configuration. Must be run from process context (which usually means
1569 * either the output polling work or a work item launched from the driver's
1570 * hotplug interrupt).
1572 * Note that the driver must ensure that this is only called _after_ the fb has
1573 * been fully set up, i.e. after the call to drm_fb_helper_initial_config.
1576 * 0 on success and a non-zero error code otherwise.
1578 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1580 struct drm_device *dev = fb_helper->dev;
1581 u32 max_width, max_height;
1586 mutex_lock(&fb_helper->dev->mode_config.mutex);
1587 if (!drm_fb_helper_is_bound(fb_helper)) {
1588 fb_helper->delayed_hotplug = true;
1589 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1592 DRM_DEBUG_KMS("\n");
1594 max_width = fb_helper->fb->width;
1595 max_height = fb_helper->fb->height;
1597 drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
1598 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1600 drm_modeset_lock_all(dev);
1601 drm_setup_crtcs(fb_helper);
1602 drm_modeset_unlock_all(dev);
1603 drm_fb_helper_set_par(fb_helper->fbdev);
1607 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1609 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1610 * but the module doesn't depend on any fb console symbols. At least
1611 * attempt to load fbcon to avoid leaving the system without a usable console.
1613 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1614 static int __init drm_fb_helper_modinit(void)
1616 const char *name = "fbcon";
1617 struct module *fbcon;
1619 mutex_lock(&module_mutex);
1620 fbcon = find_module(name);
1621 mutex_unlock(&module_mutex);
1624 request_module_nowait(name);
1628 module_init(drm_fb_helper_modinit);