Loading...
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/dma-buf.h>
34#include <linux/kernel.h>
35#include <linux/module.h>
36#include <linux/slab.h>
37#include <linux/sysrq.h>
38#include <linux/vmalloc.h>
39
40#include <drm/drm_atomic.h>
41#include <drm/drm_crtc.h>
42#include <drm/drm_crtc_helper.h>
43#include <drm/drm_drv.h>
44#include <drm/drm_fb_helper.h>
45#include <drm/drm_fourcc.h>
46#include <drm/drm_print.h>
47#include <drm/drm_vblank.h>
48
49#include "drm_internal.h"
50
51static bool drm_fbdev_emulation = true;
52module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600);
53MODULE_PARM_DESC(fbdev_emulation,
54 "Enable legacy fbdev emulation [default=true]");
55
56static int drm_fbdev_overalloc = CONFIG_DRM_FBDEV_OVERALLOC;
57module_param(drm_fbdev_overalloc, int, 0444);
58MODULE_PARM_DESC(drm_fbdev_overalloc,
59 "Overallocation of the fbdev buffer (%) [default="
60 __MODULE_STRING(CONFIG_DRM_FBDEV_OVERALLOC) "]");
61
62/*
63 * In order to keep user-space compatibility, we want in certain use-cases
64 * to keep leaking the fbdev physical address to the user-space program
65 * handling the fbdev buffer.
66 * This is a bad habit essentially kept into closed source opengl driver
67 * that should really be moved into open-source upstream projects instead
68 * of using legacy physical addresses in user space to communicate with
69 * other out-of-tree kernel modules.
70 *
71 * This module_param *should* be removed as soon as possible and be
72 * considered as a broken and legacy behaviour from a modern fbdev device.
73 */
74#if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM)
75static bool drm_leak_fbdev_smem = false;
76module_param_unsafe(drm_leak_fbdev_smem, bool, 0600);
77MODULE_PARM_DESC(drm_leak_fbdev_smem,
78 "Allow unsafe leaking fbdev physical smem address [default=false]");
79#endif
80
81static LIST_HEAD(kernel_fb_helper_list);
82static DEFINE_MUTEX(kernel_fb_helper_lock);
83
84/**
85 * DOC: fbdev helpers
86 *
87 * The fb helper functions are useful to provide an fbdev on top of a drm kernel
88 * mode setting driver. They can be used mostly independently from the crtc
89 * helper functions used by many drivers to implement the kernel mode setting
90 * interfaces.
91 *
92 * Drivers that support a dumb buffer with a virtual address and mmap support,
93 * should try out the generic fbdev emulation using drm_fbdev_generic_setup().
94 *
95 * Setup fbdev emulation by calling drm_fb_helper_fbdev_setup() and tear it
96 * down by calling drm_fb_helper_fbdev_teardown().
97 *
98 * At runtime drivers should restore the fbdev console by using
99 * drm_fb_helper_lastclose() as their &drm_driver.lastclose callback.
100 * They should also notify the fb helper code from updates to the output
101 * configuration by using drm_fb_helper_output_poll_changed() as their
102 * &drm_mode_config_funcs.output_poll_changed callback.
103 *
104 * For suspend/resume consider using drm_mode_config_helper_suspend() and
105 * drm_mode_config_helper_resume() which takes care of fbdev as well.
106 *
107 * All other functions exported by the fb helper library can be used to
108 * implement the fbdev driver interface by the driver.
109 *
110 * It is possible, though perhaps somewhat tricky, to implement race-free
111 * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
112 * helper must be called first to initialize the minimum required to make
113 * hotplug detection work. Drivers also need to make sure to properly set up
114 * the &drm_mode_config.funcs member. After calling drm_kms_helper_poll_init()
115 * it is safe to enable interrupts and start processing hotplug events. At the
116 * same time, drivers should initialize all modeset objects such as CRTCs,
117 * encoders and connectors. To finish up the fbdev helper initialization, the
118 * drm_fb_helper_init() function is called. To probe for all attached displays
119 * and set up an initial configuration using the detected hardware, drivers
120 * should call drm_fb_helper_initial_config().
121 *
122 * If &drm_framebuffer_funcs.dirty is set, the
123 * drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will
124 * accumulate changes and schedule &drm_fb_helper.dirty_work to run right
125 * away. This worker then calls the dirty() function ensuring that it will
126 * always run in process context since the fb_*() function could be running in
127 * atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io
128 * callback it will also schedule dirty_work with the damage collected from the
129 * mmap page writes. Drivers can use drm_fb_helper_defio_init() to setup
130 * deferred I/O (coupled with drm_fb_helper_fbdev_teardown()).
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_crtc *crtc;
193 const struct drm_crtc_helper_funcs *funcs;
194 struct drm_mode_set *mode_set;
195 struct drm_framebuffer *fb;
196
197 mutex_lock(&client->modeset_mutex);
198 drm_client_for_each_modeset(mode_set, client) {
199 crtc = mode_set->crtc;
200 if (drm_drv_uses_atomic_modeset(crtc->dev))
201 continue;
202
203 funcs = crtc->helper_private;
204 fb = crtc->primary->fb;
205
206 if (!crtc->enabled)
207 continue;
208
209 if (!fb) {
210 DRM_ERROR("no fb to restore??\n");
211 continue;
212 }
213
214 if (funcs->mode_set_base_atomic == NULL)
215 continue;
216
217 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
218 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
219 crtc->y, LEAVE_ATOMIC_MODE_SET);
220 }
221 mutex_unlock(&client->modeset_mutex);
222
223 return 0;
224}
225EXPORT_SYMBOL(drm_fb_helper_debug_leave);
226
227/**
228 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
229 * @fb_helper: driver-allocated fbdev helper, can be NULL
230 *
231 * This should be called from driver's drm &drm_driver.lastclose callback
232 * when implementing an fbcon on top of kms using this helper. This ensures that
233 * the user isn't greeted with a black screen when e.g. X dies.
234 *
235 * RETURNS:
236 * Zero if everything went ok, negative error code otherwise.
237 */
238int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
239{
240 bool do_delayed;
241 int ret;
242
243 if (!drm_fbdev_emulation || !fb_helper)
244 return -ENODEV;
245
246 if (READ_ONCE(fb_helper->deferred_setup))
247 return 0;
248
249 mutex_lock(&fb_helper->lock);
250 /*
251 * TODO:
252 * We should bail out here if there is a master by dropping _force.
253 * Currently these igt tests fail if we do that:
254 * - kms_fbcon_fbt@psr
255 * - kms_fbcon_fbt@psr-suspend
256 *
257 * So first these tests need to be fixed so they drop master or don't
258 * have an fd open.
259 */
260 ret = drm_client_modeset_commit_force(&fb_helper->client);
261
262 do_delayed = fb_helper->delayed_hotplug;
263 if (do_delayed)
264 fb_helper->delayed_hotplug = false;
265 mutex_unlock(&fb_helper->lock);
266
267 if (do_delayed)
268 drm_fb_helper_hotplug_event(fb_helper);
269
270 return ret;
271}
272EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
273
274#ifdef CONFIG_MAGIC_SYSRQ
275/*
276 * restore fbcon display for all kms driver's using this helper, used for sysrq
277 * and panic handling.
278 */
279static bool drm_fb_helper_force_kernel_mode(void)
280{
281 bool ret, error = false;
282 struct drm_fb_helper *helper;
283
284 if (list_empty(&kernel_fb_helper_list))
285 return false;
286
287 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
288 struct drm_device *dev = helper->dev;
289
290 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
291 continue;
292
293 mutex_lock(&helper->lock);
294 ret = drm_client_modeset_commit_force(&helper->client);
295 if (ret)
296 error = true;
297 mutex_unlock(&helper->lock);
298 }
299 return error;
300}
301
302static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
303{
304 bool ret;
305
306 ret = drm_fb_helper_force_kernel_mode();
307 if (ret == true)
308 DRM_ERROR("Failed to restore crtc configuration\n");
309}
310static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
311
312static void drm_fb_helper_sysrq(int dummy1)
313{
314 schedule_work(&drm_fb_helper_restore_work);
315}
316
317static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
318 .handler = drm_fb_helper_sysrq,
319 .help_msg = "force-fb(V)",
320 .action_msg = "Restore framebuffer console",
321};
322#else
323static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
324#endif
325
326static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
327{
328 struct drm_fb_helper *fb_helper = info->par;
329
330 mutex_lock(&fb_helper->lock);
331 drm_client_modeset_dpms(&fb_helper->client, dpms_mode);
332 mutex_unlock(&fb_helper->lock);
333}
334
335/**
336 * drm_fb_helper_blank - implementation for &fb_ops.fb_blank
337 * @blank: desired blanking state
338 * @info: fbdev registered by the helper
339 */
340int drm_fb_helper_blank(int blank, struct fb_info *info)
341{
342 if (oops_in_progress)
343 return -EBUSY;
344
345 switch (blank) {
346 /* Display: On; HSync: On, VSync: On */
347 case FB_BLANK_UNBLANK:
348 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
349 break;
350 /* Display: Off; HSync: On, VSync: On */
351 case FB_BLANK_NORMAL:
352 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
353 break;
354 /* Display: Off; HSync: Off, VSync: On */
355 case FB_BLANK_HSYNC_SUSPEND:
356 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
357 break;
358 /* Display: Off; HSync: On, VSync: Off */
359 case FB_BLANK_VSYNC_SUSPEND:
360 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
361 break;
362 /* Display: Off; HSync: Off, VSync: Off */
363 case FB_BLANK_POWERDOWN:
364 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
365 break;
366 }
367 return 0;
368}
369EXPORT_SYMBOL(drm_fb_helper_blank);
370
371static void drm_fb_helper_resume_worker(struct work_struct *work)
372{
373 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
374 resume_work);
375
376 console_lock();
377 fb_set_suspend(helper->fbdev, 0);
378 console_unlock();
379}
380
381static void drm_fb_helper_dirty_blit_real(struct drm_fb_helper *fb_helper,
382 struct drm_clip_rect *clip)
383{
384 struct drm_framebuffer *fb = fb_helper->fb;
385 unsigned int cpp = fb->format->cpp[0];
386 size_t offset = clip->y1 * fb->pitches[0] + clip->x1 * cpp;
387 void *src = fb_helper->fbdev->screen_buffer + offset;
388 void *dst = fb_helper->buffer->vaddr + offset;
389 size_t len = (clip->x2 - clip->x1) * cpp;
390 unsigned int y;
391
392 for (y = clip->y1; y < clip->y2; y++) {
393 memcpy(dst, src, len);
394 src += fb->pitches[0];
395 dst += fb->pitches[0];
396 }
397}
398
399static void drm_fb_helper_dirty_work(struct work_struct *work)
400{
401 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
402 dirty_work);
403 struct drm_clip_rect *clip = &helper->dirty_clip;
404 struct drm_clip_rect clip_copy;
405 unsigned long flags;
406 void *vaddr;
407
408 spin_lock_irqsave(&helper->dirty_lock, flags);
409 clip_copy = *clip;
410 clip->x1 = clip->y1 = ~0;
411 clip->x2 = clip->y2 = 0;
412 spin_unlock_irqrestore(&helper->dirty_lock, flags);
413
414 /* call dirty callback only when it has been really touched */
415 if (clip_copy.x1 < clip_copy.x2 && clip_copy.y1 < clip_copy.y2) {
416
417 /* Generic fbdev uses a shadow buffer */
418 if (helper->buffer) {
419 vaddr = drm_client_buffer_vmap(helper->buffer);
420 if (IS_ERR(vaddr))
421 return;
422 drm_fb_helper_dirty_blit_real(helper, &clip_copy);
423 }
424 if (helper->fb->funcs->dirty)
425 helper->fb->funcs->dirty(helper->fb, NULL, 0, 0,
426 &clip_copy, 1);
427
428 if (helper->buffer)
429 drm_client_buffer_vunmap(helper->buffer);
430 }
431}
432
433/**
434 * drm_fb_helper_prepare - setup a drm_fb_helper structure
435 * @dev: DRM device
436 * @helper: driver-allocated fbdev helper structure to set up
437 * @funcs: pointer to structure of functions associate with this helper
438 *
439 * Sets up the bare minimum to make the framebuffer helper usable. This is
440 * useful to implement race-free initialization of the polling helpers.
441 */
442void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
443 const struct drm_fb_helper_funcs *funcs)
444{
445 INIT_LIST_HEAD(&helper->kernel_fb_list);
446 spin_lock_init(&helper->dirty_lock);
447 INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker);
448 INIT_WORK(&helper->dirty_work, drm_fb_helper_dirty_work);
449 helper->dirty_clip.x1 = helper->dirty_clip.y1 = ~0;
450 mutex_init(&helper->lock);
451 helper->funcs = funcs;
452 helper->dev = dev;
453}
454EXPORT_SYMBOL(drm_fb_helper_prepare);
455
456/**
457 * drm_fb_helper_init - initialize a &struct drm_fb_helper
458 * @dev: drm device
459 * @fb_helper: driver-allocated fbdev helper structure to initialize
460 * @max_conn_count: max connector count (not used)
461 *
462 * This allocates the structures for the fbdev helper with the given limits.
463 * Note that this won't yet touch the hardware (through the driver interfaces)
464 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
465 * to allow driver writes more control over the exact init sequence.
466 *
467 * Drivers must call drm_fb_helper_prepare() before calling this function.
468 *
469 * RETURNS:
470 * Zero if everything went ok, nonzero otherwise.
471 */
472int drm_fb_helper_init(struct drm_device *dev,
473 struct drm_fb_helper *fb_helper,
474 int max_conn_count)
475{
476 int ret;
477
478 if (!drm_fbdev_emulation) {
479 dev->fb_helper = fb_helper;
480 return 0;
481 }
482
483 /*
484 * If this is not the generic fbdev client, initialize a drm_client
485 * without callbacks so we can use the modesets.
486 */
487 if (!fb_helper->client.funcs) {
488 ret = drm_client_init(dev, &fb_helper->client, "drm_fb_helper", NULL);
489 if (ret)
490 return ret;
491 }
492
493 dev->fb_helper = fb_helper;
494
495 return 0;
496}
497EXPORT_SYMBOL(drm_fb_helper_init);
498
499/**
500 * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
501 * @fb_helper: driver-allocated fbdev helper
502 *
503 * A helper to alloc fb_info and the members cmap and apertures. Called
504 * by the driver within the fb_probe fb_helper callback function. Drivers do not
505 * need to release the allocated fb_info structure themselves, this is
506 * automatically done when calling drm_fb_helper_fini().
507 *
508 * RETURNS:
509 * fb_info pointer if things went okay, pointer containing error code
510 * otherwise
511 */
512struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
513{
514 struct device *dev = fb_helper->dev->dev;
515 struct fb_info *info;
516 int ret;
517
518 info = framebuffer_alloc(0, dev);
519 if (!info)
520 return ERR_PTR(-ENOMEM);
521
522 ret = fb_alloc_cmap(&info->cmap, 256, 0);
523 if (ret)
524 goto err_release;
525
526 info->apertures = alloc_apertures(1);
527 if (!info->apertures) {
528 ret = -ENOMEM;
529 goto err_free_cmap;
530 }
531
532 fb_helper->fbdev = info;
533 info->skip_vt_switch = true;
534
535 return info;
536
537err_free_cmap:
538 fb_dealloc_cmap(&info->cmap);
539err_release:
540 framebuffer_release(info);
541 return ERR_PTR(ret);
542}
543EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
544
545/**
546 * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
547 * @fb_helper: driver-allocated fbdev helper, can be NULL
548 *
549 * A wrapper around unregister_framebuffer, to release the fb_info
550 * framebuffer device. This must be called before releasing all resources for
551 * @fb_helper by calling drm_fb_helper_fini().
552 */
553void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
554{
555 if (fb_helper && fb_helper->fbdev)
556 unregister_framebuffer(fb_helper->fbdev);
557}
558EXPORT_SYMBOL(drm_fb_helper_unregister_fbi);
559
560/**
561 * drm_fb_helper_fini - finialize a &struct drm_fb_helper
562 * @fb_helper: driver-allocated fbdev helper, can be NULL
563 *
564 * This cleans up all remaining resources associated with @fb_helper. Must be
565 * called after drm_fb_helper_unlink_fbi() was called.
566 */
567void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
568{
569 struct fb_info *info;
570
571 if (!fb_helper)
572 return;
573
574 fb_helper->dev->fb_helper = NULL;
575
576 if (!drm_fbdev_emulation)
577 return;
578
579 cancel_work_sync(&fb_helper->resume_work);
580 cancel_work_sync(&fb_helper->dirty_work);
581
582 info = fb_helper->fbdev;
583 if (info) {
584 if (info->cmap.len)
585 fb_dealloc_cmap(&info->cmap);
586 framebuffer_release(info);
587 }
588 fb_helper->fbdev = NULL;
589
590 mutex_lock(&kernel_fb_helper_lock);
591 if (!list_empty(&fb_helper->kernel_fb_list)) {
592 list_del(&fb_helper->kernel_fb_list);
593 if (list_empty(&kernel_fb_helper_list))
594 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
595 }
596 mutex_unlock(&kernel_fb_helper_lock);
597
598 mutex_destroy(&fb_helper->lock);
599
600 if (!fb_helper->client.funcs)
601 drm_client_release(&fb_helper->client);
602}
603EXPORT_SYMBOL(drm_fb_helper_fini);
604
605/**
606 * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
607 * @fb_helper: driver-allocated fbdev helper, can be NULL
608 *
609 * A wrapper around unlink_framebuffer implemented by fbdev core
610 */
611void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
612{
613 if (fb_helper && fb_helper->fbdev)
614 unlink_framebuffer(fb_helper->fbdev);
615}
616EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
617
618static bool drm_fbdev_use_shadow_fb(struct drm_fb_helper *fb_helper)
619{
620 struct drm_device *dev = fb_helper->dev;
621 struct drm_framebuffer *fb = fb_helper->fb;
622
623 return dev->mode_config.prefer_shadow_fbdev ||
624 dev->mode_config.prefer_shadow ||
625 fb->funcs->dirty;
626}
627
628static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y,
629 u32 width, u32 height)
630{
631 struct drm_fb_helper *helper = info->par;
632 struct drm_clip_rect *clip = &helper->dirty_clip;
633 unsigned long flags;
634
635 if (!drm_fbdev_use_shadow_fb(helper))
636 return;
637
638 spin_lock_irqsave(&helper->dirty_lock, flags);
639 clip->x1 = min_t(u32, clip->x1, x);
640 clip->y1 = min_t(u32, clip->y1, y);
641 clip->x2 = max_t(u32, clip->x2, x + width);
642 clip->y2 = max_t(u32, clip->y2, y + height);
643 spin_unlock_irqrestore(&helper->dirty_lock, flags);
644
645 schedule_work(&helper->dirty_work);
646}
647
648/**
649 * drm_fb_helper_deferred_io() - fbdev deferred_io callback function
650 * @info: fb_info struct pointer
651 * @pagelist: list of dirty mmap framebuffer pages
652 *
653 * This function is used as the &fb_deferred_io.deferred_io
654 * callback function for flushing the fbdev mmap writes.
655 */
656void drm_fb_helper_deferred_io(struct fb_info *info,
657 struct list_head *pagelist)
658{
659 unsigned long start, end, min, max;
660 struct page *page;
661 u32 y1, y2;
662
663 min = ULONG_MAX;
664 max = 0;
665 list_for_each_entry(page, pagelist, lru) {
666 start = page->index << PAGE_SHIFT;
667 end = start + PAGE_SIZE - 1;
668 min = min(min, start);
669 max = max(max, end);
670 }
671
672 if (min < max) {
673 y1 = min / info->fix.line_length;
674 y2 = min_t(u32, DIV_ROUND_UP(max, info->fix.line_length),
675 info->var.yres);
676 drm_fb_helper_dirty(info, 0, y1, info->var.xres, y2 - y1);
677 }
678}
679EXPORT_SYMBOL(drm_fb_helper_deferred_io);
680
681/**
682 * drm_fb_helper_defio_init - fbdev deferred I/O initialization
683 * @fb_helper: driver-allocated fbdev helper
684 *
685 * This function allocates &fb_deferred_io, sets callback to
686 * drm_fb_helper_deferred_io(), delay to 50ms and calls fb_deferred_io_init().
687 * It should be called from the &drm_fb_helper_funcs->fb_probe callback.
688 * drm_fb_helper_fbdev_teardown() cleans up deferred I/O.
689 *
690 * NOTE: A copy of &fb_ops is made and assigned to &info->fbops. This is done
691 * because fb_deferred_io_cleanup() clears &fbops->fb_mmap and would thereby
692 * affect other instances of that &fb_ops.
693 *
694 * Returns:
695 * 0 on success or a negative error code on failure.
696 */
697int drm_fb_helper_defio_init(struct drm_fb_helper *fb_helper)
698{
699 struct fb_info *info = fb_helper->fbdev;
700 struct fb_deferred_io *fbdefio;
701 struct fb_ops *fbops;
702
703 fbdefio = kzalloc(sizeof(*fbdefio), GFP_KERNEL);
704 fbops = kzalloc(sizeof(*fbops), GFP_KERNEL);
705 if (!fbdefio || !fbops) {
706 kfree(fbdefio);
707 kfree(fbops);
708 return -ENOMEM;
709 }
710
711 info->fbdefio = fbdefio;
712 fbdefio->delay = msecs_to_jiffies(50);
713 fbdefio->deferred_io = drm_fb_helper_deferred_io;
714
715 *fbops = *info->fbops;
716 info->fbops = fbops;
717
718 fb_deferred_io_init(info);
719
720 return 0;
721}
722EXPORT_SYMBOL(drm_fb_helper_defio_init);
723
724/**
725 * drm_fb_helper_sys_read - wrapper around fb_sys_read
726 * @info: fb_info struct pointer
727 * @buf: userspace buffer to read from framebuffer memory
728 * @count: number of bytes to read from framebuffer memory
729 * @ppos: read offset within framebuffer memory
730 *
731 * A wrapper around fb_sys_read implemented by fbdev core
732 */
733ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
734 size_t count, loff_t *ppos)
735{
736 return fb_sys_read(info, buf, count, ppos);
737}
738EXPORT_SYMBOL(drm_fb_helper_sys_read);
739
740/**
741 * drm_fb_helper_sys_write - wrapper around fb_sys_write
742 * @info: fb_info struct pointer
743 * @buf: userspace buffer to write to framebuffer memory
744 * @count: number of bytes to write to framebuffer memory
745 * @ppos: write offset within framebuffer memory
746 *
747 * A wrapper around fb_sys_write implemented by fbdev core
748 */
749ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
750 size_t count, loff_t *ppos)
751{
752 ssize_t ret;
753
754 ret = fb_sys_write(info, buf, count, ppos);
755 if (ret > 0)
756 drm_fb_helper_dirty(info, 0, 0, info->var.xres,
757 info->var.yres);
758
759 return ret;
760}
761EXPORT_SYMBOL(drm_fb_helper_sys_write);
762
763/**
764 * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
765 * @info: fbdev registered by the helper
766 * @rect: info about rectangle to fill
767 *
768 * A wrapper around sys_fillrect implemented by fbdev core
769 */
770void drm_fb_helper_sys_fillrect(struct fb_info *info,
771 const struct fb_fillrect *rect)
772{
773 sys_fillrect(info, rect);
774 drm_fb_helper_dirty(info, rect->dx, rect->dy,
775 rect->width, rect->height);
776}
777EXPORT_SYMBOL(drm_fb_helper_sys_fillrect);
778
779/**
780 * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
781 * @info: fbdev registered by the helper
782 * @area: info about area to copy
783 *
784 * A wrapper around sys_copyarea implemented by fbdev core
785 */
786void drm_fb_helper_sys_copyarea(struct fb_info *info,
787 const struct fb_copyarea *area)
788{
789 sys_copyarea(info, area);
790 drm_fb_helper_dirty(info, area->dx, area->dy,
791 area->width, area->height);
792}
793EXPORT_SYMBOL(drm_fb_helper_sys_copyarea);
794
795/**
796 * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
797 * @info: fbdev registered by the helper
798 * @image: info about image to blit
799 *
800 * A wrapper around sys_imageblit implemented by fbdev core
801 */
802void drm_fb_helper_sys_imageblit(struct fb_info *info,
803 const struct fb_image *image)
804{
805 sys_imageblit(info, image);
806 drm_fb_helper_dirty(info, image->dx, image->dy,
807 image->width, image->height);
808}
809EXPORT_SYMBOL(drm_fb_helper_sys_imageblit);
810
811/**
812 * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
813 * @info: fbdev registered by the helper
814 * @rect: info about rectangle to fill
815 *
816 * A wrapper around cfb_fillrect implemented by fbdev core
817 */
818void drm_fb_helper_cfb_fillrect(struct fb_info *info,
819 const struct fb_fillrect *rect)
820{
821 cfb_fillrect(info, rect);
822 drm_fb_helper_dirty(info, rect->dx, rect->dy,
823 rect->width, rect->height);
824}
825EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect);
826
827/**
828 * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
829 * @info: fbdev registered by the helper
830 * @area: info about area to copy
831 *
832 * A wrapper around cfb_copyarea implemented by fbdev core
833 */
834void drm_fb_helper_cfb_copyarea(struct fb_info *info,
835 const struct fb_copyarea *area)
836{
837 cfb_copyarea(info, area);
838 drm_fb_helper_dirty(info, area->dx, area->dy,
839 area->width, area->height);
840}
841EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea);
842
843/**
844 * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
845 * @info: fbdev registered by the helper
846 * @image: info about image to blit
847 *
848 * A wrapper around cfb_imageblit implemented by fbdev core
849 */
850void drm_fb_helper_cfb_imageblit(struct fb_info *info,
851 const struct fb_image *image)
852{
853 cfb_imageblit(info, image);
854 drm_fb_helper_dirty(info, image->dx, image->dy,
855 image->width, image->height);
856}
857EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
858
859/**
860 * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
861 * @fb_helper: driver-allocated fbdev helper, can be NULL
862 * @suspend: whether to suspend or resume
863 *
864 * A wrapper around fb_set_suspend implemented by fbdev core.
865 * Use drm_fb_helper_set_suspend_unlocked() if you don't need to take
866 * the lock yourself
867 */
868void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend)
869{
870 if (fb_helper && fb_helper->fbdev)
871 fb_set_suspend(fb_helper->fbdev, suspend);
872}
873EXPORT_SYMBOL(drm_fb_helper_set_suspend);
874
875/**
876 * drm_fb_helper_set_suspend_unlocked - wrapper around fb_set_suspend that also
877 * takes the console lock
878 * @fb_helper: driver-allocated fbdev helper, can be NULL
879 * @suspend: whether to suspend or resume
880 *
881 * A wrapper around fb_set_suspend() that takes the console lock. If the lock
882 * isn't available on resume, a worker is tasked with waiting for the lock
883 * to become available. The console lock can be pretty contented on resume
884 * due to all the printk activity.
885 *
886 * This function can be called multiple times with the same state since
887 * &fb_info.state is checked to see if fbdev is running or not before locking.
888 *
889 * Use drm_fb_helper_set_suspend() if you need to take the lock yourself.
890 */
891void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper,
892 bool suspend)
893{
894 if (!fb_helper || !fb_helper->fbdev)
895 return;
896
897 /* make sure there's no pending/ongoing resume */
898 flush_work(&fb_helper->resume_work);
899
900 if (suspend) {
901 if (fb_helper->fbdev->state != FBINFO_STATE_RUNNING)
902 return;
903
904 console_lock();
905
906 } else {
907 if (fb_helper->fbdev->state == FBINFO_STATE_RUNNING)
908 return;
909
910 if (!console_trylock()) {
911 schedule_work(&fb_helper->resume_work);
912 return;
913 }
914 }
915
916 fb_set_suspend(fb_helper->fbdev, suspend);
917 console_unlock();
918}
919EXPORT_SYMBOL(drm_fb_helper_set_suspend_unlocked);
920
921static int setcmap_pseudo_palette(struct fb_cmap *cmap, struct fb_info *info)
922{
923 u32 *palette = (u32 *)info->pseudo_palette;
924 int i;
925
926 if (cmap->start + cmap->len > 16)
927 return -EINVAL;
928
929 for (i = 0; i < cmap->len; ++i) {
930 u16 red = cmap->red[i];
931 u16 green = cmap->green[i];
932 u16 blue = cmap->blue[i];
933 u32 value;
934
935 red >>= 16 - info->var.red.length;
936 green >>= 16 - info->var.green.length;
937 blue >>= 16 - info->var.blue.length;
938 value = (red << info->var.red.offset) |
939 (green << info->var.green.offset) |
940 (blue << info->var.blue.offset);
941 if (info->var.transp.length > 0) {
942 u32 mask = (1 << info->var.transp.length) - 1;
943
944 mask <<= info->var.transp.offset;
945 value |= mask;
946 }
947 palette[cmap->start + i] = value;
948 }
949
950 return 0;
951}
952
953static int setcmap_legacy(struct fb_cmap *cmap, struct fb_info *info)
954{
955 struct drm_fb_helper *fb_helper = info->par;
956 struct drm_mode_set *modeset;
957 struct drm_crtc *crtc;
958 u16 *r, *g, *b;
959 int ret = 0;
960
961 drm_modeset_lock_all(fb_helper->dev);
962 drm_client_for_each_modeset(modeset, &fb_helper->client) {
963 crtc = modeset->crtc;
964 if (!crtc->funcs->gamma_set || !crtc->gamma_size)
965 return -EINVAL;
966
967 if (cmap->start + cmap->len > crtc->gamma_size)
968 return -EINVAL;
969
970 r = crtc->gamma_store;
971 g = r + crtc->gamma_size;
972 b = g + crtc->gamma_size;
973
974 memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r));
975 memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g));
976 memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b));
977
978 ret = crtc->funcs->gamma_set(crtc, r, g, b,
979 crtc->gamma_size, NULL);
980 if (ret)
981 return ret;
982 }
983 drm_modeset_unlock_all(fb_helper->dev);
984
985 return ret;
986}
987
988static struct drm_property_blob *setcmap_new_gamma_lut(struct drm_crtc *crtc,
989 struct fb_cmap *cmap)
990{
991 struct drm_device *dev = crtc->dev;
992 struct drm_property_blob *gamma_lut;
993 struct drm_color_lut *lut;
994 int size = crtc->gamma_size;
995 int i;
996
997 if (!size || cmap->start + cmap->len > size)
998 return ERR_PTR(-EINVAL);
999
1000 gamma_lut = drm_property_create_blob(dev, sizeof(*lut) * size, NULL);
1001 if (IS_ERR(gamma_lut))
1002 return gamma_lut;
1003
1004 lut = gamma_lut->data;
1005 if (cmap->start || cmap->len != size) {
1006 u16 *r = crtc->gamma_store;
1007 u16 *g = r + crtc->gamma_size;
1008 u16 *b = g + crtc->gamma_size;
1009
1010 for (i = 0; i < cmap->start; i++) {
1011 lut[i].red = r[i];
1012 lut[i].green = g[i];
1013 lut[i].blue = b[i];
1014 }
1015 for (i = cmap->start + cmap->len; i < size; i++) {
1016 lut[i].red = r[i];
1017 lut[i].green = g[i];
1018 lut[i].blue = b[i];
1019 }
1020 }
1021
1022 for (i = 0; i < cmap->len; i++) {
1023 lut[cmap->start + i].red = cmap->red[i];
1024 lut[cmap->start + i].green = cmap->green[i];
1025 lut[cmap->start + i].blue = cmap->blue[i];
1026 }
1027
1028 return gamma_lut;
1029}
1030
1031static int setcmap_atomic(struct fb_cmap *cmap, struct fb_info *info)
1032{
1033 struct drm_fb_helper *fb_helper = info->par;
1034 struct drm_device *dev = fb_helper->dev;
1035 struct drm_property_blob *gamma_lut = NULL;
1036 struct drm_modeset_acquire_ctx ctx;
1037 struct drm_crtc_state *crtc_state;
1038 struct drm_atomic_state *state;
1039 struct drm_mode_set *modeset;
1040 struct drm_crtc *crtc;
1041 u16 *r, *g, *b;
1042 bool replaced;
1043 int ret = 0;
1044
1045 drm_modeset_acquire_init(&ctx, 0);
1046
1047 state = drm_atomic_state_alloc(dev);
1048 if (!state) {
1049 ret = -ENOMEM;
1050 goto out_ctx;
1051 }
1052
1053 state->acquire_ctx = &ctx;
1054retry:
1055 drm_client_for_each_modeset(modeset, &fb_helper->client) {
1056 crtc = modeset->crtc;
1057
1058 if (!gamma_lut)
1059 gamma_lut = setcmap_new_gamma_lut(crtc, cmap);
1060 if (IS_ERR(gamma_lut)) {
1061 ret = PTR_ERR(gamma_lut);
1062 gamma_lut = NULL;
1063 goto out_state;
1064 }
1065
1066 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1067 if (IS_ERR(crtc_state)) {
1068 ret = PTR_ERR(crtc_state);
1069 goto out_state;
1070 }
1071
1072 replaced = drm_property_replace_blob(&crtc_state->degamma_lut,
1073 NULL);
1074 replaced |= drm_property_replace_blob(&crtc_state->ctm, NULL);
1075 replaced |= drm_property_replace_blob(&crtc_state->gamma_lut,
1076 gamma_lut);
1077 crtc_state->color_mgmt_changed |= replaced;
1078 }
1079
1080 ret = drm_atomic_commit(state);
1081 if (ret)
1082 goto out_state;
1083
1084 drm_client_for_each_modeset(modeset, &fb_helper->client) {
1085 crtc = modeset->crtc;
1086
1087 r = crtc->gamma_store;
1088 g = r + crtc->gamma_size;
1089 b = g + crtc->gamma_size;
1090
1091 memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r));
1092 memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g));
1093 memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b));
1094 }
1095
1096out_state:
1097 if (ret == -EDEADLK)
1098 goto backoff;
1099
1100 drm_property_blob_put(gamma_lut);
1101 drm_atomic_state_put(state);
1102out_ctx:
1103 drm_modeset_drop_locks(&ctx);
1104 drm_modeset_acquire_fini(&ctx);
1105
1106 return ret;
1107
1108backoff:
1109 drm_atomic_state_clear(state);
1110 drm_modeset_backoff(&ctx);
1111 goto retry;
1112}
1113
1114/**
1115 * drm_fb_helper_setcmap - implementation for &fb_ops.fb_setcmap
1116 * @cmap: cmap to set
1117 * @info: fbdev registered by the helper
1118 */
1119int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1120{
1121 struct drm_fb_helper *fb_helper = info->par;
1122 struct drm_device *dev = fb_helper->dev;
1123 int ret;
1124
1125 if (oops_in_progress)
1126 return -EBUSY;
1127
1128 mutex_lock(&fb_helper->lock);
1129
1130 if (!drm_master_internal_acquire(dev)) {
1131 ret = -EBUSY;
1132 goto unlock;
1133 }
1134
1135 mutex_lock(&fb_helper->client.modeset_mutex);
1136 if (info->fix.visual == FB_VISUAL_TRUECOLOR)
1137 ret = setcmap_pseudo_palette(cmap, info);
1138 else if (drm_drv_uses_atomic_modeset(fb_helper->dev))
1139 ret = setcmap_atomic(cmap, info);
1140 else
1141 ret = setcmap_legacy(cmap, info);
1142 mutex_unlock(&fb_helper->client.modeset_mutex);
1143
1144 drm_master_internal_release(dev);
1145unlock:
1146 mutex_unlock(&fb_helper->lock);
1147
1148 return ret;
1149}
1150EXPORT_SYMBOL(drm_fb_helper_setcmap);
1151
1152/**
1153 * drm_fb_helper_ioctl - legacy ioctl implementation
1154 * @info: fbdev registered by the helper
1155 * @cmd: ioctl command
1156 * @arg: ioctl argument
1157 *
1158 * A helper to implement the standard fbdev ioctl. Only
1159 * FBIO_WAITFORVSYNC is implemented for now.
1160 */
1161int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd,
1162 unsigned long arg)
1163{
1164 struct drm_fb_helper *fb_helper = info->par;
1165 struct drm_device *dev = fb_helper->dev;
1166 struct drm_crtc *crtc;
1167 int ret = 0;
1168
1169 mutex_lock(&fb_helper->lock);
1170 if (!drm_master_internal_acquire(dev)) {
1171 ret = -EBUSY;
1172 goto unlock;
1173 }
1174
1175 switch (cmd) {
1176 case FBIO_WAITFORVSYNC:
1177 /*
1178 * Only consider the first CRTC.
1179 *
1180 * This ioctl is supposed to take the CRTC number as
1181 * an argument, but in fbdev times, what that number
1182 * was supposed to be was quite unclear, different
1183 * drivers were passing that argument differently
1184 * (some by reference, some by value), and most of the
1185 * userspace applications were just hardcoding 0 as an
1186 * argument.
1187 *
1188 * The first CRTC should be the integrated panel on
1189 * most drivers, so this is the best choice we can
1190 * make. If we're not smart enough here, one should
1191 * just consider switch the userspace to KMS.
1192 */
1193 crtc = fb_helper->client.modesets[0].crtc;
1194
1195 /*
1196 * Only wait for a vblank event if the CRTC is
1197 * enabled, otherwise just don't do anythintg,
1198 * not even report an error.
1199 */
1200 ret = drm_crtc_vblank_get(crtc);
1201 if (!ret) {
1202 drm_crtc_wait_one_vblank(crtc);
1203 drm_crtc_vblank_put(crtc);
1204 }
1205
1206 ret = 0;
1207 break;
1208 default:
1209 ret = -ENOTTY;
1210 }
1211
1212 drm_master_internal_release(dev);
1213unlock:
1214 mutex_unlock(&fb_helper->lock);
1215 return ret;
1216}
1217EXPORT_SYMBOL(drm_fb_helper_ioctl);
1218
1219static bool drm_fb_pixel_format_equal(const struct fb_var_screeninfo *var_1,
1220 const struct fb_var_screeninfo *var_2)
1221{
1222 return var_1->bits_per_pixel == var_2->bits_per_pixel &&
1223 var_1->grayscale == var_2->grayscale &&
1224 var_1->red.offset == var_2->red.offset &&
1225 var_1->red.length == var_2->red.length &&
1226 var_1->red.msb_right == var_2->red.msb_right &&
1227 var_1->green.offset == var_2->green.offset &&
1228 var_1->green.length == var_2->green.length &&
1229 var_1->green.msb_right == var_2->green.msb_right &&
1230 var_1->blue.offset == var_2->blue.offset &&
1231 var_1->blue.length == var_2->blue.length &&
1232 var_1->blue.msb_right == var_2->blue.msb_right &&
1233 var_1->transp.offset == var_2->transp.offset &&
1234 var_1->transp.length == var_2->transp.length &&
1235 var_1->transp.msb_right == var_2->transp.msb_right;
1236}
1237
1238static void drm_fb_helper_fill_pixel_fmt(struct fb_var_screeninfo *var,
1239 u8 depth)
1240{
1241 switch (depth) {
1242 case 8:
1243 var->red.offset = 0;
1244 var->green.offset = 0;
1245 var->blue.offset = 0;
1246 var->red.length = 8; /* 8bit DAC */
1247 var->green.length = 8;
1248 var->blue.length = 8;
1249 var->transp.offset = 0;
1250 var->transp.length = 0;
1251 break;
1252 case 15:
1253 var->red.offset = 10;
1254 var->green.offset = 5;
1255 var->blue.offset = 0;
1256 var->red.length = 5;
1257 var->green.length = 5;
1258 var->blue.length = 5;
1259 var->transp.offset = 15;
1260 var->transp.length = 1;
1261 break;
1262 case 16:
1263 var->red.offset = 11;
1264 var->green.offset = 5;
1265 var->blue.offset = 0;
1266 var->red.length = 5;
1267 var->green.length = 6;
1268 var->blue.length = 5;
1269 var->transp.offset = 0;
1270 break;
1271 case 24:
1272 var->red.offset = 16;
1273 var->green.offset = 8;
1274 var->blue.offset = 0;
1275 var->red.length = 8;
1276 var->green.length = 8;
1277 var->blue.length = 8;
1278 var->transp.offset = 0;
1279 var->transp.length = 0;
1280 break;
1281 case 32:
1282 var->red.offset = 16;
1283 var->green.offset = 8;
1284 var->blue.offset = 0;
1285 var->red.length = 8;
1286 var->green.length = 8;
1287 var->blue.length = 8;
1288 var->transp.offset = 24;
1289 var->transp.length = 8;
1290 break;
1291 default:
1292 break;
1293 }
1294}
1295
1296/**
1297 * drm_fb_helper_check_var - implementation for &fb_ops.fb_check_var
1298 * @var: screeninfo to check
1299 * @info: fbdev registered by the helper
1300 */
1301int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
1302 struct fb_info *info)
1303{
1304 struct drm_fb_helper *fb_helper = info->par;
1305 struct drm_framebuffer *fb = fb_helper->fb;
1306
1307 if (in_dbg_master())
1308 return -EINVAL;
1309
1310 if (var->pixclock != 0) {
1311 DRM_DEBUG("fbdev emulation doesn't support changing the pixel clock, value of pixclock is ignored\n");
1312 var->pixclock = 0;
1313 }
1314
1315 if ((drm_format_info_block_width(fb->format, 0) > 1) ||
1316 (drm_format_info_block_height(fb->format, 0) > 1))
1317 return -EINVAL;
1318
1319 /*
1320 * Changes struct fb_var_screeninfo are currently not pushed back
1321 * to KMS, hence fail if different settings are requested.
1322 */
1323 if (var->bits_per_pixel != fb->format->cpp[0] * 8 ||
1324 var->xres > fb->width || var->yres > fb->height ||
1325 var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
1326 DRM_DEBUG("fb requested width/height/bpp can't fit in current fb "
1327 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1328 var->xres, var->yres, var->bits_per_pixel,
1329 var->xres_virtual, var->yres_virtual,
1330 fb->width, fb->height, fb->format->cpp[0] * 8);
1331 return -EINVAL;
1332 }
1333
1334 /*
1335 * Workaround for SDL 1.2, which is known to be setting all pixel format
1336 * fields values to zero in some cases. We treat this situation as a
1337 * kind of "use some reasonable autodetected values".
1338 */
1339 if (!var->red.offset && !var->green.offset &&
1340 !var->blue.offset && !var->transp.offset &&
1341 !var->red.length && !var->green.length &&
1342 !var->blue.length && !var->transp.length &&
1343 !var->red.msb_right && !var->green.msb_right &&
1344 !var->blue.msb_right && !var->transp.msb_right) {
1345 drm_fb_helper_fill_pixel_fmt(var, fb->format->depth);
1346 }
1347
1348 /*
1349 * drm fbdev emulation doesn't support changing the pixel format at all,
1350 * so reject all pixel format changing requests.
1351 */
1352 if (!drm_fb_pixel_format_equal(var, &info->var)) {
1353 DRM_DEBUG("fbdev emulation doesn't support changing the pixel format\n");
1354 return -EINVAL;
1355 }
1356
1357 return 0;
1358}
1359EXPORT_SYMBOL(drm_fb_helper_check_var);
1360
1361/**
1362 * drm_fb_helper_set_par - implementation for &fb_ops.fb_set_par
1363 * @info: fbdev registered by the helper
1364 *
1365 * This will let fbcon do the mode init and is called at initialization time by
1366 * the fbdev core when registering the driver, and later on through the hotplug
1367 * callback.
1368 */
1369int drm_fb_helper_set_par(struct fb_info *info)
1370{
1371 struct drm_fb_helper *fb_helper = info->par;
1372 struct fb_var_screeninfo *var = &info->var;
1373
1374 if (oops_in_progress)
1375 return -EBUSY;
1376
1377 if (var->pixclock != 0) {
1378 DRM_ERROR("PIXEL CLOCK SET\n");
1379 return -EINVAL;
1380 }
1381
1382 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
1383
1384 return 0;
1385}
1386EXPORT_SYMBOL(drm_fb_helper_set_par);
1387
1388static void pan_set(struct drm_fb_helper *fb_helper, int x, int y)
1389{
1390 struct drm_mode_set *mode_set;
1391
1392 mutex_lock(&fb_helper->client.modeset_mutex);
1393 drm_client_for_each_modeset(mode_set, &fb_helper->client) {
1394 mode_set->x = x;
1395 mode_set->y = y;
1396 }
1397 mutex_unlock(&fb_helper->client.modeset_mutex);
1398}
1399
1400static int pan_display_atomic(struct fb_var_screeninfo *var,
1401 struct fb_info *info)
1402{
1403 struct drm_fb_helper *fb_helper = info->par;
1404 int ret;
1405
1406 pan_set(fb_helper, var->xoffset, var->yoffset);
1407
1408 ret = drm_client_modeset_commit_force(&fb_helper->client);
1409 if (!ret) {
1410 info->var.xoffset = var->xoffset;
1411 info->var.yoffset = var->yoffset;
1412 } else
1413 pan_set(fb_helper, info->var.xoffset, info->var.yoffset);
1414
1415 return ret;
1416}
1417
1418static int pan_display_legacy(struct fb_var_screeninfo *var,
1419 struct fb_info *info)
1420{
1421 struct drm_fb_helper *fb_helper = info->par;
1422 struct drm_client_dev *client = &fb_helper->client;
1423 struct drm_mode_set *modeset;
1424 int ret = 0;
1425
1426 mutex_lock(&client->modeset_mutex);
1427 drm_modeset_lock_all(fb_helper->dev);
1428 drm_client_for_each_modeset(modeset, client) {
1429 modeset->x = var->xoffset;
1430 modeset->y = var->yoffset;
1431
1432 if (modeset->num_connectors) {
1433 ret = drm_mode_set_config_internal(modeset);
1434 if (!ret) {
1435 info->var.xoffset = var->xoffset;
1436 info->var.yoffset = var->yoffset;
1437 }
1438 }
1439 }
1440 drm_modeset_unlock_all(fb_helper->dev);
1441 mutex_unlock(&client->modeset_mutex);
1442
1443 return ret;
1444}
1445
1446/**
1447 * drm_fb_helper_pan_display - implementation for &fb_ops.fb_pan_display
1448 * @var: updated screen information
1449 * @info: fbdev registered by the helper
1450 */
1451int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
1452 struct fb_info *info)
1453{
1454 struct drm_fb_helper *fb_helper = info->par;
1455 struct drm_device *dev = fb_helper->dev;
1456 int ret;
1457
1458 if (oops_in_progress)
1459 return -EBUSY;
1460
1461 mutex_lock(&fb_helper->lock);
1462 if (!drm_master_internal_acquire(dev)) {
1463 ret = -EBUSY;
1464 goto unlock;
1465 }
1466
1467 if (drm_drv_uses_atomic_modeset(dev))
1468 ret = pan_display_atomic(var, info);
1469 else
1470 ret = pan_display_legacy(var, info);
1471
1472 drm_master_internal_release(dev);
1473unlock:
1474 mutex_unlock(&fb_helper->lock);
1475
1476 return ret;
1477}
1478EXPORT_SYMBOL(drm_fb_helper_pan_display);
1479
1480/*
1481 * Allocates the backing storage and sets up the fbdev info structure through
1482 * the ->fb_probe callback.
1483 */
1484static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
1485 int preferred_bpp)
1486{
1487 struct drm_client_dev *client = &fb_helper->client;
1488 int ret = 0;
1489 int crtc_count = 0;
1490 struct drm_connector_list_iter conn_iter;
1491 struct drm_fb_helper_surface_size sizes;
1492 struct drm_connector *connector;
1493 struct drm_mode_set *mode_set;
1494 int best_depth = 0;
1495
1496 memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
1497 sizes.surface_depth = 24;
1498 sizes.surface_bpp = 32;
1499 sizes.fb_width = (u32)-1;
1500 sizes.fb_height = (u32)-1;
1501
1502 /*
1503 * If driver picks 8 or 16 by default use that for both depth/bpp
1504 * to begin with
1505 */
1506 if (preferred_bpp != sizes.surface_bpp)
1507 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
1508
1509 drm_connector_list_iter_begin(fb_helper->dev, &conn_iter);
1510 drm_client_for_each_connector_iter(connector, &conn_iter) {
1511 struct drm_cmdline_mode *cmdline_mode;
1512
1513 cmdline_mode = &connector->cmdline_mode;
1514
1515 if (cmdline_mode->bpp_specified) {
1516 switch (cmdline_mode->bpp) {
1517 case 8:
1518 sizes.surface_depth = sizes.surface_bpp = 8;
1519 break;
1520 case 15:
1521 sizes.surface_depth = 15;
1522 sizes.surface_bpp = 16;
1523 break;
1524 case 16:
1525 sizes.surface_depth = sizes.surface_bpp = 16;
1526 break;
1527 case 24:
1528 sizes.surface_depth = sizes.surface_bpp = 24;
1529 break;
1530 case 32:
1531 sizes.surface_depth = 24;
1532 sizes.surface_bpp = 32;
1533 break;
1534 }
1535 break;
1536 }
1537 }
1538 drm_connector_list_iter_end(&conn_iter);
1539
1540 /*
1541 * If we run into a situation where, for example, the primary plane
1542 * supports RGBA5551 (16 bpp, depth 15) but not RGB565 (16 bpp, depth
1543 * 16) we need to scale down the depth of the sizes we request.
1544 */
1545 mutex_lock(&client->modeset_mutex);
1546 drm_client_for_each_modeset(mode_set, client) {
1547 struct drm_crtc *crtc = mode_set->crtc;
1548 struct drm_plane *plane = crtc->primary;
1549 int j;
1550
1551 DRM_DEBUG("test CRTC %u primary plane\n", drm_crtc_index(crtc));
1552
1553 for (j = 0; j < plane->format_count; j++) {
1554 const struct drm_format_info *fmt;
1555
1556 fmt = drm_format_info(plane->format_types[j]);
1557
1558 /*
1559 * Do not consider YUV or other complicated formats
1560 * for framebuffers. This means only legacy formats
1561 * are supported (fmt->depth is a legacy field) but
1562 * the framebuffer emulation can only deal with such
1563 * formats, specifically RGB/BGA formats.
1564 */
1565 if (fmt->depth == 0)
1566 continue;
1567
1568 /* We found a perfect fit, great */
1569 if (fmt->depth == sizes.surface_depth) {
1570 best_depth = fmt->depth;
1571 break;
1572 }
1573
1574 /* Skip depths above what we're looking for */
1575 if (fmt->depth > sizes.surface_depth)
1576 continue;
1577
1578 /* Best depth found so far */
1579 if (fmt->depth > best_depth)
1580 best_depth = fmt->depth;
1581 }
1582 }
1583 if (sizes.surface_depth != best_depth && best_depth) {
1584 DRM_INFO("requested bpp %d, scaled depth down to %d",
1585 sizes.surface_bpp, best_depth);
1586 sizes.surface_depth = best_depth;
1587 }
1588
1589 /* first up get a count of crtcs now in use and new min/maxes width/heights */
1590 crtc_count = 0;
1591 drm_client_for_each_modeset(mode_set, client) {
1592 struct drm_display_mode *desired_mode;
1593 int x, y, j;
1594 /* in case of tile group, are we the last tile vert or horiz?
1595 * If no tile group you are always the last one both vertically
1596 * and horizontally
1597 */
1598 bool lastv = true, lasth = true;
1599
1600 desired_mode = mode_set->mode;
1601
1602 if (!desired_mode)
1603 continue;
1604
1605 crtc_count++;
1606
1607 x = mode_set->x;
1608 y = mode_set->y;
1609
1610 sizes.surface_width = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
1611 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
1612
1613 for (j = 0; j < mode_set->num_connectors; j++) {
1614 struct drm_connector *connector = mode_set->connectors[j];
1615
1616 if (connector->has_tile) {
1617 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
1618 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
1619 /* cloning to multiple tiles is just crazy-talk, so: */
1620 break;
1621 }
1622 }
1623
1624 if (lasth)
1625 sizes.fb_width = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
1626 if (lastv)
1627 sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
1628 }
1629 mutex_unlock(&client->modeset_mutex);
1630
1631 if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1632 DRM_INFO("Cannot find any crtc or sizes\n");
1633
1634 /* First time: disable all crtc's.. */
1635 if (!fb_helper->deferred_setup)
1636 drm_client_modeset_commit(client);
1637 return -EAGAIN;
1638 }
1639
1640 /* Handle our overallocation */
1641 sizes.surface_height *= drm_fbdev_overalloc;
1642 sizes.surface_height /= 100;
1643
1644 /* push down into drivers */
1645 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1646 if (ret < 0)
1647 return ret;
1648
1649 strcpy(fb_helper->fb->comm, "[fbcon]");
1650 return 0;
1651}
1652
1653static void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1654 uint32_t depth)
1655{
1656 info->fix.type = FB_TYPE_PACKED_PIXELS;
1657 info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1658 FB_VISUAL_TRUECOLOR;
1659 info->fix.mmio_start = 0;
1660 info->fix.mmio_len = 0;
1661 info->fix.type_aux = 0;
1662 info->fix.xpanstep = 1; /* doing it in hw */
1663 info->fix.ypanstep = 1; /* doing it in hw */
1664 info->fix.ywrapstep = 0;
1665 info->fix.accel = FB_ACCEL_NONE;
1666
1667 info->fix.line_length = pitch;
1668}
1669
1670static void drm_fb_helper_fill_var(struct fb_info *info,
1671 struct drm_fb_helper *fb_helper,
1672 uint32_t fb_width, uint32_t fb_height)
1673{
1674 struct drm_framebuffer *fb = fb_helper->fb;
1675
1676 WARN_ON((drm_format_info_block_width(fb->format, 0) > 1) ||
1677 (drm_format_info_block_height(fb->format, 0) > 1));
1678 info->pseudo_palette = fb_helper->pseudo_palette;
1679 info->var.xres_virtual = fb->width;
1680 info->var.yres_virtual = fb->height;
1681 info->var.bits_per_pixel = fb->format->cpp[0] * 8;
1682 info->var.accel_flags = FB_ACCELF_TEXT;
1683 info->var.xoffset = 0;
1684 info->var.yoffset = 0;
1685 info->var.activate = FB_ACTIVATE_NOW;
1686
1687 drm_fb_helper_fill_pixel_fmt(&info->var, fb->format->depth);
1688
1689 info->var.xres = fb_width;
1690 info->var.yres = fb_height;
1691}
1692
1693/**
1694 * drm_fb_helper_fill_info - initializes fbdev information
1695 * @info: fbdev instance to set up
1696 * @fb_helper: fb helper instance to use as template
1697 * @sizes: describes fbdev size and scanout surface size
1698 *
1699 * Sets up the variable and fixed fbdev metainformation from the given fb helper
1700 * instance and the drm framebuffer allocated in &drm_fb_helper.fb.
1701 *
1702 * Drivers should call this (or their equivalent setup code) from their
1703 * &drm_fb_helper_funcs.fb_probe callback after having allocated the fbdev
1704 * backing storage framebuffer.
1705 */
1706void drm_fb_helper_fill_info(struct fb_info *info,
1707 struct drm_fb_helper *fb_helper,
1708 struct drm_fb_helper_surface_size *sizes)
1709{
1710 struct drm_framebuffer *fb = fb_helper->fb;
1711
1712 drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
1713 drm_fb_helper_fill_var(info, fb_helper,
1714 sizes->fb_width, sizes->fb_height);
1715
1716 info->par = fb_helper;
1717 snprintf(info->fix.id, sizeof(info->fix.id), "%sdrmfb",
1718 fb_helper->dev->driver->name);
1719
1720}
1721EXPORT_SYMBOL(drm_fb_helper_fill_info);
1722
1723/*
1724 * This is a continuation of drm_setup_crtcs() that sets up anything related
1725 * to the framebuffer. During initialization, drm_setup_crtcs() is called before
1726 * the framebuffer has been allocated (fb_helper->fb and fb_helper->fbdev).
1727 * So, any setup that touches those fields needs to be done here instead of in
1728 * drm_setup_crtcs().
1729 */
1730static void drm_setup_crtcs_fb(struct drm_fb_helper *fb_helper)
1731{
1732 struct drm_client_dev *client = &fb_helper->client;
1733 struct drm_connector_list_iter conn_iter;
1734 struct fb_info *info = fb_helper->fbdev;
1735 unsigned int rotation, sw_rotations = 0;
1736 struct drm_connector *connector;
1737 struct drm_mode_set *modeset;
1738
1739 mutex_lock(&client->modeset_mutex);
1740 drm_client_for_each_modeset(modeset, client) {
1741 if (!modeset->num_connectors)
1742 continue;
1743
1744 modeset->fb = fb_helper->fb;
1745
1746 if (drm_client_rotation(modeset, &rotation))
1747 /* Rotating in hardware, fbcon should not rotate */
1748 sw_rotations |= DRM_MODE_ROTATE_0;
1749 else
1750 sw_rotations |= rotation;
1751 }
1752 mutex_unlock(&client->modeset_mutex);
1753
1754 drm_connector_list_iter_begin(fb_helper->dev, &conn_iter);
1755 drm_client_for_each_connector_iter(connector, &conn_iter) {
1756
1757 /* use first connected connector for the physical dimensions */
1758 if (connector->status == connector_status_connected) {
1759 info->var.width = connector->display_info.width_mm;
1760 info->var.height = connector->display_info.height_mm;
1761 break;
1762 }
1763 }
1764 drm_connector_list_iter_end(&conn_iter);
1765
1766 switch (sw_rotations) {
1767 case DRM_MODE_ROTATE_0:
1768 info->fbcon_rotate_hint = FB_ROTATE_UR;
1769 break;
1770 case DRM_MODE_ROTATE_90:
1771 info->fbcon_rotate_hint = FB_ROTATE_CCW;
1772 break;
1773 case DRM_MODE_ROTATE_180:
1774 info->fbcon_rotate_hint = FB_ROTATE_UD;
1775 break;
1776 case DRM_MODE_ROTATE_270:
1777 info->fbcon_rotate_hint = FB_ROTATE_CW;
1778 break;
1779 default:
1780 /*
1781 * Multiple bits are set / multiple rotations requested
1782 * fbcon cannot handle separate rotation settings per
1783 * output, so fallback to unrotated.
1784 */
1785 info->fbcon_rotate_hint = FB_ROTATE_UR;
1786 }
1787}
1788
1789/* Note: Drops fb_helper->lock before returning. */
1790static int
1791__drm_fb_helper_initial_config_and_unlock(struct drm_fb_helper *fb_helper,
1792 int bpp_sel)
1793{
1794 struct drm_device *dev = fb_helper->dev;
1795 struct fb_info *info;
1796 unsigned int width, height;
1797 int ret;
1798
1799 width = dev->mode_config.max_width;
1800 height = dev->mode_config.max_height;
1801
1802 drm_client_modeset_probe(&fb_helper->client, width, height);
1803 ret = drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1804 if (ret < 0) {
1805 if (ret == -EAGAIN) {
1806 fb_helper->preferred_bpp = bpp_sel;
1807 fb_helper->deferred_setup = true;
1808 ret = 0;
1809 }
1810 mutex_unlock(&fb_helper->lock);
1811
1812 return ret;
1813 }
1814 drm_setup_crtcs_fb(fb_helper);
1815
1816 fb_helper->deferred_setup = false;
1817
1818 info = fb_helper->fbdev;
1819 info->var.pixclock = 0;
1820 /* Shamelessly allow physical address leaking to userspace */
1821#if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM)
1822 if (!drm_leak_fbdev_smem)
1823#endif
1824 /* don't leak any physical addresses to userspace */
1825 info->flags |= FBINFO_HIDE_SMEM_START;
1826
1827 /* Need to drop locks to avoid recursive deadlock in
1828 * register_framebuffer. This is ok because the only thing left to do is
1829 * register the fbdev emulation instance in kernel_fb_helper_list. */
1830 mutex_unlock(&fb_helper->lock);
1831
1832 ret = register_framebuffer(info);
1833 if (ret < 0)
1834 return ret;
1835
1836 dev_info(dev->dev, "fb%d: %s frame buffer device\n",
1837 info->node, info->fix.id);
1838
1839 mutex_lock(&kernel_fb_helper_lock);
1840 if (list_empty(&kernel_fb_helper_list))
1841 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1842
1843 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1844 mutex_unlock(&kernel_fb_helper_lock);
1845
1846 return 0;
1847}
1848
1849/**
1850 * drm_fb_helper_initial_config - setup a sane initial connector configuration
1851 * @fb_helper: fb_helper device struct
1852 * @bpp_sel: bpp value to use for the framebuffer configuration
1853 *
1854 * Scans the CRTCs and connectors and tries to put together an initial setup.
1855 * At the moment, this is a cloned configuration across all heads with
1856 * a new framebuffer object as the backing store.
1857 *
1858 * Note that this also registers the fbdev and so allows userspace to call into
1859 * the driver through the fbdev interfaces.
1860 *
1861 * This function will call down into the &drm_fb_helper_funcs.fb_probe callback
1862 * to let the driver allocate and initialize the fbdev info structure and the
1863 * drm framebuffer used to back the fbdev. drm_fb_helper_fill_info() is provided
1864 * as a helper to setup simple default values for the fbdev info structure.
1865 *
1866 * HANG DEBUGGING:
1867 *
1868 * When you have fbcon support built-in or already loaded, this function will do
1869 * a full modeset to setup the fbdev console. Due to locking misdesign in the
1870 * VT/fbdev subsystem that entire modeset sequence has to be done while holding
1871 * console_lock. Until console_unlock is called no dmesg lines will be sent out
1872 * to consoles, not even serial console. This means when your driver crashes,
1873 * you will see absolutely nothing else but a system stuck in this function,
1874 * with no further output. Any kind of printk() you place within your own driver
1875 * or in the drm core modeset code will also never show up.
1876 *
1877 * Standard debug practice is to run the fbcon setup without taking the
1878 * console_lock as a hack, to be able to see backtraces and crashes on the
1879 * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel
1880 * cmdline option.
1881 *
1882 * The other option is to just disable fbdev emulation since very likely the
1883 * first modeset from userspace will crash in the same way, and is even easier
1884 * to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0
1885 * kernel cmdline option.
1886 *
1887 * RETURNS:
1888 * Zero if everything went ok, nonzero otherwise.
1889 */
1890int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1891{
1892 int ret;
1893
1894 if (!drm_fbdev_emulation)
1895 return 0;
1896
1897 mutex_lock(&fb_helper->lock);
1898 ret = __drm_fb_helper_initial_config_and_unlock(fb_helper, bpp_sel);
1899
1900 return ret;
1901}
1902EXPORT_SYMBOL(drm_fb_helper_initial_config);
1903
1904/**
1905 * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1906 * probing all the outputs attached to the fb
1907 * @fb_helper: driver-allocated fbdev helper, can be NULL
1908 *
1909 * Scan the connectors attached to the fb_helper and try to put together a
1910 * setup after notification of a change in output configuration.
1911 *
1912 * Called at runtime, takes the mode config locks to be able to check/change the
1913 * modeset configuration. Must be run from process context (which usually means
1914 * either the output polling work or a work item launched from the driver's
1915 * hotplug interrupt).
1916 *
1917 * Note that drivers may call this even before calling
1918 * drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows
1919 * for a race-free fbcon setup and will make sure that the fbdev emulation will
1920 * not miss any hotplug events.
1921 *
1922 * RETURNS:
1923 * 0 on success and a non-zero error code otherwise.
1924 */
1925int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1926{
1927 int err = 0;
1928
1929 if (!drm_fbdev_emulation || !fb_helper)
1930 return 0;
1931
1932 mutex_lock(&fb_helper->lock);
1933 if (fb_helper->deferred_setup) {
1934 err = __drm_fb_helper_initial_config_and_unlock(fb_helper,
1935 fb_helper->preferred_bpp);
1936 return err;
1937 }
1938
1939 if (!fb_helper->fb || !drm_master_internal_acquire(fb_helper->dev)) {
1940 fb_helper->delayed_hotplug = true;
1941 mutex_unlock(&fb_helper->lock);
1942 return err;
1943 }
1944
1945 drm_master_internal_release(fb_helper->dev);
1946
1947 DRM_DEBUG_KMS("\n");
1948
1949 drm_client_modeset_probe(&fb_helper->client, fb_helper->fb->width, fb_helper->fb->height);
1950 drm_setup_crtcs_fb(fb_helper);
1951 mutex_unlock(&fb_helper->lock);
1952
1953 drm_fb_helper_set_par(fb_helper->fbdev);
1954
1955 return 0;
1956}
1957EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1958
1959/**
1960 * drm_fb_helper_fbdev_setup() - Setup fbdev emulation
1961 * @dev: DRM device
1962 * @fb_helper: fbdev helper structure to set up
1963 * @funcs: fbdev helper functions
1964 * @preferred_bpp: Preferred bits per pixel for the device.
1965 * @dev->mode_config.preferred_depth is used if this is zero.
1966 * @max_conn_count: Maximum number of connectors (not used)
1967 *
1968 * This function sets up fbdev emulation and registers fbdev for access by
1969 * userspace. If all connectors are disconnected, setup is deferred to the next
1970 * time drm_fb_helper_hotplug_event() is called.
1971 * The caller must to provide a &drm_fb_helper_funcs->fb_probe callback
1972 * function.
1973 *
1974 * Use drm_fb_helper_fbdev_teardown() to destroy the fbdev.
1975 *
1976 * See also: drm_fb_helper_initial_config(), drm_fbdev_generic_setup().
1977 *
1978 * Returns:
1979 * Zero on success or negative error code on failure.
1980 */
1981int drm_fb_helper_fbdev_setup(struct drm_device *dev,
1982 struct drm_fb_helper *fb_helper,
1983 const struct drm_fb_helper_funcs *funcs,
1984 unsigned int preferred_bpp,
1985 unsigned int max_conn_count)
1986{
1987 int ret;
1988
1989 if (!preferred_bpp)
1990 preferred_bpp = dev->mode_config.preferred_depth;
1991 if (!preferred_bpp)
1992 preferred_bpp = 32;
1993
1994 drm_fb_helper_prepare(dev, fb_helper, funcs);
1995
1996 ret = drm_fb_helper_init(dev, fb_helper, 0);
1997 if (ret < 0) {
1998 DRM_DEV_ERROR(dev->dev, "fbdev: Failed to initialize (ret=%d)\n", ret);
1999 return ret;
2000 }
2001
2002 if (!drm_drv_uses_atomic_modeset(dev))
2003 drm_helper_disable_unused_functions(dev);
2004
2005 ret = drm_fb_helper_initial_config(fb_helper, preferred_bpp);
2006 if (ret < 0) {
2007 DRM_DEV_ERROR(dev->dev, "fbdev: Failed to set configuration (ret=%d)\n", ret);
2008 goto err_drm_fb_helper_fini;
2009 }
2010
2011 return 0;
2012
2013err_drm_fb_helper_fini:
2014 drm_fb_helper_fbdev_teardown(dev);
2015
2016 return ret;
2017}
2018EXPORT_SYMBOL(drm_fb_helper_fbdev_setup);
2019
2020/**
2021 * drm_fb_helper_fbdev_teardown - Tear down fbdev emulation
2022 * @dev: DRM device
2023 *
2024 * This function unregisters fbdev if not already done and cleans up the
2025 * associated resources including the &drm_framebuffer.
2026 * The driver is responsible for freeing the &drm_fb_helper structure which is
2027 * stored in &drm_device->fb_helper. Do note that this pointer has been cleared
2028 * when this function returns.
2029 *
2030 * In order to support device removal/unplug while file handles are still open,
2031 * drm_fb_helper_unregister_fbi() should be called on device removal and
2032 * drm_fb_helper_fbdev_teardown() in the &drm_driver->release callback when
2033 * file handles are closed.
2034 */
2035void drm_fb_helper_fbdev_teardown(struct drm_device *dev)
2036{
2037 struct drm_fb_helper *fb_helper = dev->fb_helper;
2038 struct fb_ops *fbops = NULL;
2039
2040 if (!fb_helper)
2041 return;
2042
2043 /* Unregister if it hasn't been done already */
2044 if (fb_helper->fbdev && fb_helper->fbdev->dev)
2045 drm_fb_helper_unregister_fbi(fb_helper);
2046
2047 if (fb_helper->fbdev && fb_helper->fbdev->fbdefio) {
2048 fb_deferred_io_cleanup(fb_helper->fbdev);
2049 kfree(fb_helper->fbdev->fbdefio);
2050 fbops = fb_helper->fbdev->fbops;
2051 }
2052
2053 drm_fb_helper_fini(fb_helper);
2054 kfree(fbops);
2055
2056 if (fb_helper->fb)
2057 drm_framebuffer_remove(fb_helper->fb);
2058}
2059EXPORT_SYMBOL(drm_fb_helper_fbdev_teardown);
2060
2061/**
2062 * drm_fb_helper_lastclose - DRM driver lastclose helper for fbdev emulation
2063 * @dev: DRM device
2064 *
2065 * This function can be used as the &drm_driver->lastclose callback for drivers
2066 * that only need to call drm_fb_helper_restore_fbdev_mode_unlocked().
2067 */
2068void drm_fb_helper_lastclose(struct drm_device *dev)
2069{
2070 drm_fb_helper_restore_fbdev_mode_unlocked(dev->fb_helper);
2071}
2072EXPORT_SYMBOL(drm_fb_helper_lastclose);
2073
2074/**
2075 * drm_fb_helper_output_poll_changed - DRM mode config \.output_poll_changed
2076 * helper for fbdev emulation
2077 * @dev: DRM device
2078 *
2079 * This function can be used as the
2080 * &drm_mode_config_funcs.output_poll_changed callback for drivers that only
2081 * need to call drm_fb_helper_hotplug_event().
2082 */
2083void drm_fb_helper_output_poll_changed(struct drm_device *dev)
2084{
2085 drm_fb_helper_hotplug_event(dev->fb_helper);
2086}
2087EXPORT_SYMBOL(drm_fb_helper_output_poll_changed);
2088
2089/* @user: 1=userspace, 0=fbcon */
2090static int drm_fbdev_fb_open(struct fb_info *info, int user)
2091{
2092 struct drm_fb_helper *fb_helper = info->par;
2093
2094 /* No need to take a ref for fbcon because it unbinds on unregister */
2095 if (user && !try_module_get(fb_helper->dev->driver->fops->owner))
2096 return -ENODEV;
2097
2098 return 0;
2099}
2100
2101static int drm_fbdev_fb_release(struct fb_info *info, int user)
2102{
2103 struct drm_fb_helper *fb_helper = info->par;
2104
2105 if (user)
2106 module_put(fb_helper->dev->driver->fops->owner);
2107
2108 return 0;
2109}
2110
2111static void drm_fbdev_cleanup(struct drm_fb_helper *fb_helper)
2112{
2113 struct fb_info *fbi = fb_helper->fbdev;
2114 struct fb_ops *fbops = NULL;
2115 void *shadow = NULL;
2116
2117 if (!fb_helper->dev)
2118 return;
2119
2120 if (fbi && fbi->fbdefio) {
2121 fb_deferred_io_cleanup(fbi);
2122 shadow = fbi->screen_buffer;
2123 fbops = fbi->fbops;
2124 }
2125
2126 drm_fb_helper_fini(fb_helper);
2127
2128 if (shadow) {
2129 vfree(shadow);
2130 kfree(fbops);
2131 }
2132
2133 drm_client_framebuffer_delete(fb_helper->buffer);
2134}
2135
2136static void drm_fbdev_release(struct drm_fb_helper *fb_helper)
2137{
2138 drm_fbdev_cleanup(fb_helper);
2139 drm_client_release(&fb_helper->client);
2140 kfree(fb_helper);
2141}
2142
2143/*
2144 * fb_ops.fb_destroy is called by the last put_fb_info() call at the end of
2145 * unregister_framebuffer() or fb_release().
2146 */
2147static void drm_fbdev_fb_destroy(struct fb_info *info)
2148{
2149 drm_fbdev_release(info->par);
2150}
2151
2152static int drm_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
2153{
2154 struct drm_fb_helper *fb_helper = info->par;
2155
2156 if (fb_helper->dev->driver->gem_prime_mmap)
2157 return fb_helper->dev->driver->gem_prime_mmap(fb_helper->buffer->gem, vma);
2158 else
2159 return -ENODEV;
2160}
2161
2162static struct fb_ops drm_fbdev_fb_ops = {
2163 .owner = THIS_MODULE,
2164 DRM_FB_HELPER_DEFAULT_OPS,
2165 .fb_open = drm_fbdev_fb_open,
2166 .fb_release = drm_fbdev_fb_release,
2167 .fb_destroy = drm_fbdev_fb_destroy,
2168 .fb_mmap = drm_fbdev_fb_mmap,
2169 .fb_read = drm_fb_helper_sys_read,
2170 .fb_write = drm_fb_helper_sys_write,
2171 .fb_fillrect = drm_fb_helper_sys_fillrect,
2172 .fb_copyarea = drm_fb_helper_sys_copyarea,
2173 .fb_imageblit = drm_fb_helper_sys_imageblit,
2174};
2175
2176static struct fb_deferred_io drm_fbdev_defio = {
2177 .delay = HZ / 20,
2178 .deferred_io = drm_fb_helper_deferred_io,
2179};
2180
2181/**
2182 * drm_fb_helper_generic_probe - Generic fbdev emulation probe helper
2183 * @fb_helper: fbdev helper structure
2184 * @sizes: describes fbdev size and scanout surface size
2185 *
2186 * This function uses the client API to create a framebuffer backed by a dumb buffer.
2187 *
2188 * The _sys_ versions are used for &fb_ops.fb_read, fb_write, fb_fillrect,
2189 * fb_copyarea, fb_imageblit.
2190 *
2191 * Returns:
2192 * Zero on success or negative error code on failure.
2193 */
2194int drm_fb_helper_generic_probe(struct drm_fb_helper *fb_helper,
2195 struct drm_fb_helper_surface_size *sizes)
2196{
2197 struct drm_client_dev *client = &fb_helper->client;
2198 struct drm_client_buffer *buffer;
2199 struct drm_framebuffer *fb;
2200 struct fb_info *fbi;
2201 u32 format;
2202 void *vaddr;
2203
2204 DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d)\n",
2205 sizes->surface_width, sizes->surface_height,
2206 sizes->surface_bpp);
2207
2208 format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
2209 buffer = drm_client_framebuffer_create(client, sizes->surface_width,
2210 sizes->surface_height, format);
2211 if (IS_ERR(buffer))
2212 return PTR_ERR(buffer);
2213
2214 fb_helper->buffer = buffer;
2215 fb_helper->fb = buffer->fb;
2216 fb = buffer->fb;
2217
2218 fbi = drm_fb_helper_alloc_fbi(fb_helper);
2219 if (IS_ERR(fbi))
2220 return PTR_ERR(fbi);
2221
2222 fbi->fbops = &drm_fbdev_fb_ops;
2223 fbi->screen_size = fb->height * fb->pitches[0];
2224 fbi->fix.smem_len = fbi->screen_size;
2225
2226 drm_fb_helper_fill_info(fbi, fb_helper, sizes);
2227
2228 if (drm_fbdev_use_shadow_fb(fb_helper)) {
2229 struct fb_ops *fbops;
2230 void *shadow;
2231
2232 /*
2233 * fb_deferred_io_cleanup() clears &fbops->fb_mmap so a per
2234 * instance version is necessary.
2235 */
2236 fbops = kzalloc(sizeof(*fbops), GFP_KERNEL);
2237 shadow = vzalloc(fbi->screen_size);
2238 if (!fbops || !shadow) {
2239 kfree(fbops);
2240 vfree(shadow);
2241 return -ENOMEM;
2242 }
2243
2244 *fbops = *fbi->fbops;
2245 fbi->fbops = fbops;
2246 fbi->screen_buffer = shadow;
2247 fbi->fbdefio = &drm_fbdev_defio;
2248
2249 fb_deferred_io_init(fbi);
2250 } else {
2251 /* buffer is mapped for HW framebuffer */
2252 vaddr = drm_client_buffer_vmap(fb_helper->buffer);
2253 if (IS_ERR(vaddr))
2254 return PTR_ERR(vaddr);
2255
2256 fbi->screen_buffer = vaddr;
2257 /* Shamelessly leak the physical address to user-space */
2258#if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM)
2259 if (drm_leak_fbdev_smem && fbi->fix.smem_start == 0)
2260 fbi->fix.smem_start =
2261 page_to_phys(virt_to_page(fbi->screen_buffer));
2262#endif
2263 }
2264
2265 return 0;
2266}
2267EXPORT_SYMBOL(drm_fb_helper_generic_probe);
2268
2269static const struct drm_fb_helper_funcs drm_fb_helper_generic_funcs = {
2270 .fb_probe = drm_fb_helper_generic_probe,
2271};
2272
2273static void drm_fbdev_client_unregister(struct drm_client_dev *client)
2274{
2275 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
2276
2277 if (fb_helper->fbdev)
2278 /* drm_fbdev_fb_destroy() takes care of cleanup */
2279 drm_fb_helper_unregister_fbi(fb_helper);
2280 else
2281 drm_fbdev_release(fb_helper);
2282}
2283
2284static int drm_fbdev_client_restore(struct drm_client_dev *client)
2285{
2286 drm_fb_helper_lastclose(client->dev);
2287
2288 return 0;
2289}
2290
2291static int drm_fbdev_client_hotplug(struct drm_client_dev *client)
2292{
2293 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
2294 struct drm_device *dev = client->dev;
2295 int ret;
2296
2297 /* Setup is not retried if it has failed */
2298 if (!fb_helper->dev && fb_helper->funcs)
2299 return 0;
2300
2301 if (dev->fb_helper)
2302 return drm_fb_helper_hotplug_event(dev->fb_helper);
2303
2304 if (!dev->mode_config.num_connector) {
2305 DRM_DEV_DEBUG(dev->dev, "No connectors found, will not create framebuffer!\n");
2306 return 0;
2307 }
2308
2309 drm_fb_helper_prepare(dev, fb_helper, &drm_fb_helper_generic_funcs);
2310
2311 ret = drm_fb_helper_init(dev, fb_helper, 0);
2312 if (ret)
2313 goto err;
2314
2315 if (!drm_drv_uses_atomic_modeset(dev))
2316 drm_helper_disable_unused_functions(dev);
2317
2318 ret = drm_fb_helper_initial_config(fb_helper, fb_helper->preferred_bpp);
2319 if (ret)
2320 goto err_cleanup;
2321
2322 return 0;
2323
2324err_cleanup:
2325 drm_fbdev_cleanup(fb_helper);
2326err:
2327 fb_helper->dev = NULL;
2328 fb_helper->fbdev = NULL;
2329
2330 DRM_DEV_ERROR(dev->dev, "fbdev: Failed to setup generic emulation (ret=%d)\n", ret);
2331
2332 return ret;
2333}
2334
2335static const struct drm_client_funcs drm_fbdev_client_funcs = {
2336 .owner = THIS_MODULE,
2337 .unregister = drm_fbdev_client_unregister,
2338 .restore = drm_fbdev_client_restore,
2339 .hotplug = drm_fbdev_client_hotplug,
2340};
2341
2342/**
2343 * drm_fbdev_generic_setup() - Setup generic fbdev emulation
2344 * @dev: DRM device
2345 * @preferred_bpp: Preferred bits per pixel for the device.
2346 * @dev->mode_config.preferred_depth is used if this is zero.
2347 *
2348 * This function sets up generic fbdev emulation for drivers that supports
2349 * dumb buffers with a virtual address and that can be mmap'ed. If the driver
2350 * does not support these functions, it could use drm_fb_helper_fbdev_setup().
2351 *
2352 * Restore, hotplug events and teardown are all taken care of. Drivers that do
2353 * suspend/resume need to call drm_fb_helper_set_suspend_unlocked() themselves.
2354 * Simple drivers might use drm_mode_config_helper_suspend().
2355 *
2356 * Drivers that set the dirty callback on their framebuffer will get a shadow
2357 * fbdev buffer that is blitted onto the real buffer. This is done in order to
2358 * make deferred I/O work with all kinds of buffers.
2359 *
2360 * This function is safe to call even when there are no connectors present.
2361 * Setup will be retried on the next hotplug event.
2362 *
2363 * The fbdev is destroyed by drm_dev_unregister().
2364 *
2365 * Returns:
2366 * Zero on success or negative error code on failure.
2367 */
2368int drm_fbdev_generic_setup(struct drm_device *dev, unsigned int preferred_bpp)
2369{
2370 struct drm_fb_helper *fb_helper;
2371 int ret;
2372
2373 WARN(dev->fb_helper, "fb_helper is already set!\n");
2374
2375 if (!drm_fbdev_emulation)
2376 return 0;
2377
2378 fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
2379 if (!fb_helper)
2380 return -ENOMEM;
2381
2382 ret = drm_client_init(dev, &fb_helper->client, "fbdev", &drm_fbdev_client_funcs);
2383 if (ret) {
2384 kfree(fb_helper);
2385 DRM_DEV_ERROR(dev->dev, "Failed to register client: %d\n", ret);
2386 return ret;
2387 }
2388
2389 if (!preferred_bpp)
2390 preferred_bpp = dev->mode_config.preferred_depth;
2391 if (!preferred_bpp)
2392 preferred_bpp = 32;
2393 fb_helper->preferred_bpp = preferred_bpp;
2394
2395 ret = drm_fbdev_client_hotplug(&fb_helper->client);
2396 if (ret)
2397 DRM_DEV_DEBUG(dev->dev, "client hotplug ret=%d\n", ret);
2398
2399 drm_client_register(&fb_helper->client);
2400
2401 return 0;
2402}
2403EXPORT_SYMBOL(drm_fbdev_generic_setup);
2404
2405/* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
2406 * but the module doesn't depend on any fb console symbols. At least
2407 * attempt to load fbcon to avoid leaving the system without a usable console.
2408 */
2409int __init drm_fb_helper_modinit(void)
2410{
2411#if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
2412 const char name[] = "fbcon";
2413 struct module *fbcon;
2414
2415 mutex_lock(&module_mutex);
2416 fbcon = find_module(name);
2417 mutex_unlock(&module_mutex);
2418
2419 if (!fbcon)
2420 request_module_nowait(name);
2421#endif
2422 return 0;
2423}
2424EXPORT_SYMBOL(drm_fb_helper_modinit);
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);