1 /*
2  * Copyright © 2007 David Airlie
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice (including the next
12  * paragraph) shall be included in all copies or substantial portions of the
13  * Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21  * DEALINGS IN THE SOFTWARE.
22  *
23  * Authors:
24  *     David Airlie
25  */
26 
27 #include <linux/async.h>
28 #include <linux/console.h>
29 #include <linux/delay.h>
30 #include <linux/errno.h>
31 #include <linux/fb.h>
32 #include <linux/init.h>
33 #include <linux/kernel.h>
34 #include <linux/mm.h>
35 #include <linux/module.h>
36 #include <linux/string.h>
37 #include <linux/sysrq.h>
38 #include <linux/tty.h>
39 #include <linux/vga_switcheroo.h>
40 
41 #include <drm/drm_crtc.h>
42 #include <drm/drm_fb_helper.h>
43 #include <drm/drm_fourcc.h>
44 #include <drm/drm_gem_framebuffer_helper.h>
45 
46 #include "gem/i915_gem_lmem.h"
47 #include "gem/i915_gem_mman.h"
48 
49 #include "i915_drv.h"
50 #include "intel_display_types.h"
51 #include "intel_fb.h"
52 #include "intel_fb_pin.h"
53 #include "intel_fbdev.h"
54 #include "intel_frontbuffer.h"
55 
56 struct intel_fbdev {
57 	struct drm_fb_helper helper;
58 	struct intel_framebuffer *fb;
59 	struct i915_vma *vma;
60 	unsigned long vma_flags;
61 	async_cookie_t cookie;
62 	int preferred_bpp;
63 
64 	/* Whether or not fbdev hpd processing is temporarily suspended */
65 	bool hpd_suspended: 1;
66 	/* Set when a hotplug was received while HPD processing was suspended */
67 	bool hpd_waiting: 1;
68 
69 	/* Protects hpd_suspended */
70 	struct mutex hpd_lock;
71 };
72 
73 static struct intel_fbdev *to_intel_fbdev(struct drm_fb_helper *fb_helper)
74 {
75 	return container_of(fb_helper, struct intel_fbdev, helper);
76 }
77 
78 static struct intel_frontbuffer *to_frontbuffer(struct intel_fbdev *ifbdev)
79 {
80 	return ifbdev->fb->frontbuffer;
81 }
82 
83 static void intel_fbdev_invalidate(struct intel_fbdev *ifbdev)
84 {
85 	intel_frontbuffer_invalidate(to_frontbuffer(ifbdev), ORIGIN_CPU);
86 }
87 
88 FB_GEN_DEFAULT_DEFERRED_IOMEM_OPS(intel_fbdev,
89 				  drm_fb_helper_damage_range,
90 				  drm_fb_helper_damage_area)
91 
92 static int intel_fbdev_set_par(struct fb_info *info)
93 {
94 	struct intel_fbdev *ifbdev = to_intel_fbdev(info->par);
95 	int ret;
96 
97 	ret = drm_fb_helper_set_par(info);
98 	if (ret == 0)
99 		intel_fbdev_invalidate(ifbdev);
100 
101 	return ret;
102 }
103 
104 static int intel_fbdev_blank(int blank, struct fb_info *info)
105 {
106 	struct intel_fbdev *ifbdev = to_intel_fbdev(info->par);
107 	int ret;
108 
109 	ret = drm_fb_helper_blank(blank, info);
110 	if (ret == 0)
111 		intel_fbdev_invalidate(ifbdev);
112 
113 	return ret;
114 }
115 
116 static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
117 				   struct fb_info *info)
118 {
119 	struct intel_fbdev *ifbdev = to_intel_fbdev(info->par);
120 	int ret;
121 
122 	ret = drm_fb_helper_pan_display(var, info);
123 	if (ret == 0)
124 		intel_fbdev_invalidate(ifbdev);
125 
126 	return ret;
127 }
128 
129 static int intel_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
130 {
131 	struct intel_fbdev *fbdev = to_intel_fbdev(info->par);
132 	struct drm_gem_object *bo = drm_gem_fb_get_obj(&fbdev->fb->base, 0);
133 	struct drm_i915_gem_object *obj = to_intel_bo(bo);
134 
135 	return i915_gem_fb_mmap(obj, vma);
136 }
137 
138 static const struct fb_ops intelfb_ops = {
139 	.owner = THIS_MODULE,
140 	__FB_DEFAULT_DEFERRED_OPS_RDWR(intel_fbdev),
141 	DRM_FB_HELPER_DEFAULT_OPS,
142 	.fb_set_par = intel_fbdev_set_par,
143 	.fb_blank = intel_fbdev_blank,
144 	.fb_pan_display = intel_fbdev_pan_display,
145 	__FB_DEFAULT_DEFERRED_OPS_DRAW(intel_fbdev),
146 	.fb_mmap = intel_fbdev_mmap,
147 };
148 
149 static int intelfb_alloc(struct drm_fb_helper *helper,
150 			 struct drm_fb_helper_surface_size *sizes)
151 {
152 	struct intel_fbdev *ifbdev = to_intel_fbdev(helper);
153 	struct drm_framebuffer *fb;
154 	struct drm_device *dev = helper->dev;
155 	struct drm_i915_private *dev_priv = to_i915(dev);
156 	struct drm_mode_fb_cmd2 mode_cmd = {};
157 	struct drm_i915_gem_object *obj;
158 	int size;
159 
160 	/* we don't do packed 24bpp */
161 	if (sizes->surface_bpp == 24)
162 		sizes->surface_bpp = 32;
163 
164 	mode_cmd.width = sizes->surface_width;
165 	mode_cmd.height = sizes->surface_height;
166 
167 	mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
168 				    DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
169 	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
170 							  sizes->surface_depth);
171 
172 	size = mode_cmd.pitches[0] * mode_cmd.height;
173 	size = PAGE_ALIGN(size);
174 
175 	obj = ERR_PTR(-ENODEV);
176 	if (HAS_LMEM(dev_priv)) {
177 		obj = i915_gem_object_create_lmem(dev_priv, size,
178 						  I915_BO_ALLOC_CONTIGUOUS |
179 						  I915_BO_ALLOC_USER);
180 	} else {
181 		/*
182 		 * If the FB is too big, just don't use it since fbdev is not very
183 		 * important and we should probably use that space with FBC or other
184 		 * features.
185 		 *
186 		 * Also skip stolen on MTL as Wa_22018444074 mitigation.
187 		 */
188 		if (!(IS_METEORLAKE(dev_priv)) && size * 2 < dev_priv->dsm.usable_size)
189 			obj = i915_gem_object_create_stolen(dev_priv, size);
190 		if (IS_ERR(obj))
191 			obj = i915_gem_object_create_shmem(dev_priv, size);
192 	}
193 
194 	if (IS_ERR(obj)) {
195 		drm_err(&dev_priv->drm, "failed to allocate framebuffer (%pe)\n", obj);
196 		return PTR_ERR(obj);
197 	}
198 
199 	fb = intel_framebuffer_create(obj, &mode_cmd);
200 	i915_gem_object_put(obj);
201 	if (IS_ERR(fb))
202 		return PTR_ERR(fb);
203 
204 	ifbdev->fb = to_intel_framebuffer(fb);
205 	return 0;
206 }
207 
208 static int intelfb_create(struct drm_fb_helper *helper,
209 			  struct drm_fb_helper_surface_size *sizes)
210 {
211 	struct intel_fbdev *ifbdev = to_intel_fbdev(helper);
212 	struct intel_framebuffer *intel_fb = ifbdev->fb;
213 	struct drm_device *dev = helper->dev;
214 	struct drm_i915_private *dev_priv = to_i915(dev);
215 	struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
216 	struct i915_ggtt *ggtt = to_gt(dev_priv)->ggtt;
217 	const struct i915_gtt_view view = {
218 		.type = I915_GTT_VIEW_NORMAL,
219 	};
220 	intel_wakeref_t wakeref;
221 	struct fb_info *info;
222 	struct i915_vma *vma;
223 	unsigned long flags = 0;
224 	bool prealloc = false;
225 	void __iomem *vaddr;
226 	struct drm_i915_gem_object *obj;
227 	struct i915_gem_ww_ctx ww;
228 	int ret;
229 
230 	mutex_lock(&ifbdev->hpd_lock);
231 	ret = ifbdev->hpd_suspended ? -EAGAIN : 0;
232 	mutex_unlock(&ifbdev->hpd_lock);
233 	if (ret)
234 		return ret;
235 
236 	if (intel_fb &&
237 	    (sizes->fb_width > intel_fb->base.width ||
238 	     sizes->fb_height > intel_fb->base.height)) {
239 		drm_dbg_kms(&dev_priv->drm,
240 			    "BIOS fb too small (%dx%d), we require (%dx%d),"
241 			    " releasing it\n",
242 			    intel_fb->base.width, intel_fb->base.height,
243 			    sizes->fb_width, sizes->fb_height);
244 		drm_framebuffer_put(&intel_fb->base);
245 		intel_fb = ifbdev->fb = NULL;
246 	}
247 	if (!intel_fb || drm_WARN_ON(dev, !intel_fb_obj(&intel_fb->base))) {
248 		drm_dbg_kms(&dev_priv->drm,
249 			    "no BIOS fb, allocating a new one\n");
250 		ret = intelfb_alloc(helper, sizes);
251 		if (ret)
252 			return ret;
253 		intel_fb = ifbdev->fb;
254 	} else {
255 		drm_dbg_kms(&dev_priv->drm, "re-using BIOS fb\n");
256 		prealloc = true;
257 		sizes->fb_width = intel_fb->base.width;
258 		sizes->fb_height = intel_fb->base.height;
259 	}
260 
261 	wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);
262 
263 	/* Pin the GGTT vma for our access via info->screen_base.
264 	 * This also validates that any existing fb inherited from the
265 	 * BIOS is suitable for own access.
266 	 */
267 	vma = intel_pin_and_fence_fb_obj(&ifbdev->fb->base, false,
268 					 &view, false, &flags);
269 	if (IS_ERR(vma)) {
270 		ret = PTR_ERR(vma);
271 		goto out_unlock;
272 	}
273 
274 	info = drm_fb_helper_alloc_info(helper);
275 	if (IS_ERR(info)) {
276 		drm_err(&dev_priv->drm, "Failed to allocate fb_info (%pe)\n", info);
277 		ret = PTR_ERR(info);
278 		goto out_unpin;
279 	}
280 
281 	ifbdev->helper.fb = &ifbdev->fb->base;
282 
283 	info->fbops = &intelfb_ops;
284 
285 	obj = intel_fb_obj(&intel_fb->base);
286 	if (i915_gem_object_is_lmem(obj)) {
287 		struct intel_memory_region *mem = obj->mm.region;
288 
289 		/* Use fbdev's framebuffer from lmem for discrete */
290 		info->fix.smem_start =
291 			(unsigned long)(mem->io_start +
292 					i915_gem_object_get_dma_address(obj, 0));
293 		info->fix.smem_len = obj->base.size;
294 	} else {
295 		/* Our framebuffer is the entirety of fbdev's system memory */
296 		info->fix.smem_start =
297 			(unsigned long)(ggtt->gmadr.start + i915_ggtt_offset(vma));
298 		info->fix.smem_len = vma->size;
299 	}
300 
301 	for_i915_gem_ww(&ww, ret, false) {
302 		ret = i915_gem_object_lock(vma->obj, &ww);
303 
304 		if (ret)
305 			continue;
306 
307 		vaddr = i915_vma_pin_iomap(vma);
308 		if (IS_ERR(vaddr)) {
309 			drm_err(&dev_priv->drm,
310 				"Failed to remap framebuffer into virtual memory (%pe)\n", vaddr);
311 			ret = PTR_ERR(vaddr);
312 			continue;
313 		}
314 	}
315 
316 	if (ret)
317 		goto out_unpin;
318 
319 	info->screen_base = vaddr;
320 	info->screen_size = vma->size;
321 
322 	drm_fb_helper_fill_info(info, &ifbdev->helper, sizes);
323 
324 	/* If the object is shmemfs backed, it will have given us zeroed pages.
325 	 * If the object is stolen however, it will be full of whatever
326 	 * garbage was left in there.
327 	 */
328 	if (!i915_gem_object_is_shmem(vma->obj) && !prealloc)
329 		memset_io(info->screen_base, 0, info->screen_size);
330 
331 	/* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
332 
333 	drm_dbg_kms(&dev_priv->drm, "allocated %dx%d fb: 0x%08x\n",
334 		    ifbdev->fb->base.width, ifbdev->fb->base.height,
335 		    i915_ggtt_offset(vma));
336 	ifbdev->vma = vma;
337 	ifbdev->vma_flags = flags;
338 
339 	intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
340 	vga_switcheroo_client_fb_set(pdev, info);
341 	return 0;
342 
343 out_unpin:
344 	intel_unpin_fb_vma(vma, flags);
345 out_unlock:
346 	intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
347 	return ret;
348 }
349 
350 static int intelfb_dirty(struct drm_fb_helper *helper, struct drm_clip_rect *clip)
351 {
352 	if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2))
353 		return 0;
354 
355 	if (helper->fb->funcs->dirty)
356 		return helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1);
357 
358 	return 0;
359 }
360 
361 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
362 	.fb_probe = intelfb_create,
363 	.fb_dirty = intelfb_dirty,
364 };
365 
366 static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
367 {
368 	/* We rely on the object-free to release the VMA pinning for
369 	 * the info->screen_base mmaping. Leaking the VMA is simpler than
370 	 * trying to rectify all the possible error paths leading here.
371 	 */
372 
373 	drm_fb_helper_fini(&ifbdev->helper);
374 
375 	if (ifbdev->vma)
376 		intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
377 
378 	if (ifbdev->fb)
379 		drm_framebuffer_remove(&ifbdev->fb->base);
380 
381 	drm_fb_helper_unprepare(&ifbdev->helper);
382 	kfree(ifbdev);
383 }
384 
385 /*
386  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
387  * The core display code will have read out the current plane configuration,
388  * so we use that to figure out if there's an object for us to use as the
389  * fb, and if so, we re-use it for the fbdev configuration.
390  *
391  * Note we only support a single fb shared across pipes for boot (mostly for
392  * fbcon), so we just find the biggest and use that.
393  */
394 static bool intel_fbdev_init_bios(struct drm_device *dev,
395 				  struct intel_fbdev *ifbdev)
396 {
397 	struct drm_i915_private *i915 = to_i915(dev);
398 	struct intel_framebuffer *fb = NULL;
399 	struct intel_crtc *crtc;
400 	unsigned int max_size = 0;
401 
402 	/* Find the largest fb */
403 	for_each_intel_crtc(dev, crtc) {
404 		struct intel_crtc_state *crtc_state =
405 			to_intel_crtc_state(crtc->base.state);
406 		struct intel_plane *plane =
407 			to_intel_plane(crtc->base.primary);
408 		struct intel_plane_state *plane_state =
409 			to_intel_plane_state(plane->base.state);
410 		struct drm_i915_gem_object *obj =
411 			intel_fb_obj(plane_state->uapi.fb);
412 
413 		if (!crtc_state->uapi.active) {
414 			drm_dbg_kms(&i915->drm,
415 				    "[CRTC:%d:%s] not active, skipping\n",
416 				    crtc->base.base.id, crtc->base.name);
417 			continue;
418 		}
419 
420 		if (!obj) {
421 			drm_dbg_kms(&i915->drm,
422 				    "[PLANE:%d:%s] no fb, skipping\n",
423 				    plane->base.base.id, plane->base.name);
424 			continue;
425 		}
426 
427 		if (obj->base.size > max_size) {
428 			drm_dbg_kms(&i915->drm,
429 				    "found possible fb from [PLANE:%d:%s]\n",
430 				    plane->base.base.id, plane->base.name);
431 			fb = to_intel_framebuffer(plane_state->uapi.fb);
432 			max_size = obj->base.size;
433 		}
434 	}
435 
436 	if (!fb) {
437 		drm_dbg_kms(&i915->drm,
438 			    "no active fbs found, not using BIOS config\n");
439 		goto out;
440 	}
441 
442 	/* Now make sure all the pipes will fit into it */
443 	for_each_intel_crtc(dev, crtc) {
444 		struct intel_crtc_state *crtc_state =
445 			to_intel_crtc_state(crtc->base.state);
446 		struct intel_plane *plane =
447 			to_intel_plane(crtc->base.primary);
448 		unsigned int cur_size;
449 
450 		if (!crtc_state->uapi.active) {
451 			drm_dbg_kms(&i915->drm,
452 				    "[CRTC:%d:%s] not active, skipping\n",
453 				    crtc->base.base.id, crtc->base.name);
454 			continue;
455 		}
456 
457 		drm_dbg_kms(&i915->drm, "checking [PLANE:%d:%s] for BIOS fb\n",
458 			    plane->base.base.id, plane->base.name);
459 
460 		/*
461 		 * See if the plane fb we found above will fit on this
462 		 * pipe.  Note we need to use the selected fb's pitch and bpp
463 		 * rather than the current pipe's, since they differ.
464 		 */
465 		cur_size = crtc_state->uapi.adjusted_mode.crtc_hdisplay;
466 		cur_size = cur_size * fb->base.format->cpp[0];
467 		if (fb->base.pitches[0] < cur_size) {
468 			drm_dbg_kms(&i915->drm,
469 				    "fb not wide enough for [PLANE:%d:%s] (%d vs %d)\n",
470 				    plane->base.base.id, plane->base.name,
471 				    cur_size, fb->base.pitches[0]);
472 			fb = NULL;
473 			break;
474 		}
475 
476 		cur_size = crtc_state->uapi.adjusted_mode.crtc_vdisplay;
477 		cur_size = intel_fb_align_height(&fb->base, 0, cur_size);
478 		cur_size *= fb->base.pitches[0];
479 		drm_dbg_kms(&i915->drm,
480 			    "[CRTC:%d:%s] area: %dx%d, bpp: %d, size: %d\n",
481 			    crtc->base.base.id, crtc->base.name,
482 			    crtc_state->uapi.adjusted_mode.crtc_hdisplay,
483 			    crtc_state->uapi.adjusted_mode.crtc_vdisplay,
484 			    fb->base.format->cpp[0] * 8,
485 			    cur_size);
486 
487 		if (cur_size > max_size) {
488 			drm_dbg_kms(&i915->drm,
489 				    "fb not big enough for [PLANE:%d:%s] (%d vs %d)\n",
490 				    plane->base.base.id, plane->base.name,
491 				    cur_size, max_size);
492 			fb = NULL;
493 			break;
494 		}
495 
496 		drm_dbg_kms(&i915->drm,
497 			    "fb big enough [PLANE:%d:%s] (%d >= %d)\n",
498 			    plane->base.base.id, plane->base.name,
499 			    max_size, cur_size);
500 	}
501 
502 	if (!fb) {
503 		drm_dbg_kms(&i915->drm,
504 			    "BIOS fb not suitable for all pipes, not using\n");
505 		goto out;
506 	}
507 
508 	ifbdev->preferred_bpp = fb->base.format->cpp[0] * 8;
509 	ifbdev->fb = fb;
510 
511 	drm_framebuffer_get(&ifbdev->fb->base);
512 
513 	/* Final pass to check if any active pipes don't have fbs */
514 	for_each_intel_crtc(dev, crtc) {
515 		struct intel_crtc_state *crtc_state =
516 			to_intel_crtc_state(crtc->base.state);
517 		struct intel_plane *plane =
518 			to_intel_plane(crtc->base.primary);
519 		struct intel_plane_state *plane_state =
520 			to_intel_plane_state(plane->base.state);
521 
522 		if (!crtc_state->uapi.active)
523 			continue;
524 
525 		drm_WARN(dev, !plane_state->uapi.fb,
526 			 "re-used BIOS config but lost an fb on [PLANE:%d:%s]\n",
527 			 plane->base.base.id, plane->base.name);
528 	}
529 
530 
531 	drm_dbg_kms(&i915->drm, "using BIOS fb for initial console\n");
532 	return true;
533 
534 out:
535 
536 	return false;
537 }
538 
539 static void intel_fbdev_suspend_worker(struct work_struct *work)
540 {
541 	intel_fbdev_set_suspend(&container_of(work,
542 					      struct drm_i915_private,
543 					      display.fbdev.suspend_work)->drm,
544 				FBINFO_STATE_RUNNING,
545 				true);
546 }
547 
548 int intel_fbdev_init(struct drm_device *dev)
549 {
550 	struct drm_i915_private *dev_priv = to_i915(dev);
551 	struct intel_fbdev *ifbdev;
552 	int ret;
553 
554 	if (drm_WARN_ON(dev, !HAS_DISPLAY(dev_priv)))
555 		return -ENODEV;
556 
557 	ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
558 	if (ifbdev == NULL)
559 		return -ENOMEM;
560 
561 	mutex_init(&ifbdev->hpd_lock);
562 	drm_fb_helper_prepare(dev, &ifbdev->helper, 32, &intel_fb_helper_funcs);
563 
564 	if (intel_fbdev_init_bios(dev, ifbdev))
565 		ifbdev->helper.preferred_bpp = ifbdev->preferred_bpp;
566 	else
567 		ifbdev->preferred_bpp = ifbdev->helper.preferred_bpp;
568 
569 	ret = drm_fb_helper_init(dev, &ifbdev->helper);
570 	if (ret) {
571 		kfree(ifbdev);
572 		return ret;
573 	}
574 
575 	dev_priv->display.fbdev.fbdev = ifbdev;
576 	INIT_WORK(&dev_priv->display.fbdev.suspend_work, intel_fbdev_suspend_worker);
577 
578 	return 0;
579 }
580 
581 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
582 {
583 	struct intel_fbdev *ifbdev = data;
584 
585 	/* Due to peculiar init order wrt to hpd handling this is separate. */
586 	if (drm_fb_helper_initial_config(&ifbdev->helper))
587 		intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
588 }
589 
590 void intel_fbdev_initial_config_async(struct drm_i915_private *dev_priv)
591 {
592 	struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
593 
594 	if (!ifbdev)
595 		return;
596 
597 	ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
598 }
599 
600 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
601 {
602 	if (!ifbdev->cookie)
603 		return;
604 
605 	/* Only serialises with all preceding async calls, hence +1 */
606 	async_synchronize_cookie(ifbdev->cookie + 1);
607 	ifbdev->cookie = 0;
608 }
609 
610 void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
611 {
612 	struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
613 
614 	if (!ifbdev)
615 		return;
616 
617 	intel_fbdev_set_suspend(&dev_priv->drm, FBINFO_STATE_SUSPENDED, true);
618 
619 	if (!current_is_async())
620 		intel_fbdev_sync(ifbdev);
621 
622 	drm_fb_helper_unregister_info(&ifbdev->helper);
623 }
624 
625 void intel_fbdev_fini(struct drm_i915_private *dev_priv)
626 {
627 	struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->display.fbdev.fbdev);
628 
629 	if (!ifbdev)
630 		return;
631 
632 	intel_fbdev_destroy(ifbdev);
633 }
634 
635 /* Suspends/resumes fbdev processing of incoming HPD events. When resuming HPD
636  * processing, fbdev will perform a full connector reprobe if a hotplug event
637  * was received while HPD was suspended.
638  */
639 static void intel_fbdev_hpd_set_suspend(struct drm_i915_private *i915, int state)
640 {
641 	struct intel_fbdev *ifbdev = i915->display.fbdev.fbdev;
642 	bool send_hpd = false;
643 
644 	mutex_lock(&ifbdev->hpd_lock);
645 	ifbdev->hpd_suspended = state == FBINFO_STATE_SUSPENDED;
646 	send_hpd = !ifbdev->hpd_suspended && ifbdev->hpd_waiting;
647 	ifbdev->hpd_waiting = false;
648 	mutex_unlock(&ifbdev->hpd_lock);
649 
650 	if (send_hpd) {
651 		drm_dbg_kms(&i915->drm, "Handling delayed fbcon HPD event\n");
652 		drm_fb_helper_hotplug_event(&ifbdev->helper);
653 	}
654 }
655 
656 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
657 {
658 	struct drm_i915_private *dev_priv = to_i915(dev);
659 	struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
660 	struct fb_info *info;
661 
662 	if (!ifbdev)
663 		return;
664 
665 	if (drm_WARN_ON(&dev_priv->drm, !HAS_DISPLAY(dev_priv)))
666 		return;
667 
668 	if (!ifbdev->vma)
669 		goto set_suspend;
670 
671 	info = ifbdev->helper.info;
672 
673 	if (synchronous) {
674 		/* Flush any pending work to turn the console on, and then
675 		 * wait to turn it off. It must be synchronous as we are
676 		 * about to suspend or unload the driver.
677 		 *
678 		 * Note that from within the work-handler, we cannot flush
679 		 * ourselves, so only flush outstanding work upon suspend!
680 		 */
681 		if (state != FBINFO_STATE_RUNNING)
682 			flush_work(&dev_priv->display.fbdev.suspend_work);
683 
684 		console_lock();
685 	} else {
686 		/*
687 		 * The console lock can be pretty contented on resume due
688 		 * to all the printk activity.  Try to keep it out of the hot
689 		 * path of resume if possible.
690 		 */
691 		drm_WARN_ON(dev, state != FBINFO_STATE_RUNNING);
692 		if (!console_trylock()) {
693 			/* Don't block our own workqueue as this can
694 			 * be run in parallel with other i915.ko tasks.
695 			 */
696 			queue_work(dev_priv->unordered_wq,
697 				   &dev_priv->display.fbdev.suspend_work);
698 			return;
699 		}
700 	}
701 
702 	/* On resume from hibernation: If the object is shmemfs backed, it has
703 	 * been restored from swap. If the object is stolen however, it will be
704 	 * full of whatever garbage was left in there.
705 	 */
706 	if (state == FBINFO_STATE_RUNNING &&
707 	    !i915_gem_object_is_shmem(intel_fb_obj(&ifbdev->fb->base)))
708 		memset_io(info->screen_base, 0, info->screen_size);
709 
710 	drm_fb_helper_set_suspend(&ifbdev->helper, state);
711 	console_unlock();
712 
713 set_suspend:
714 	intel_fbdev_hpd_set_suspend(dev_priv, state);
715 }
716 
717 void intel_fbdev_output_poll_changed(struct drm_device *dev)
718 {
719 	struct intel_fbdev *ifbdev = to_i915(dev)->display.fbdev.fbdev;
720 	bool send_hpd;
721 
722 	if (!ifbdev)
723 		return;
724 
725 	intel_fbdev_sync(ifbdev);
726 
727 	mutex_lock(&ifbdev->hpd_lock);
728 	send_hpd = !ifbdev->hpd_suspended;
729 	ifbdev->hpd_waiting = true;
730 	mutex_unlock(&ifbdev->hpd_lock);
731 
732 	if (send_hpd && (ifbdev->vma || ifbdev->helper.deferred_setup))
733 		drm_fb_helper_hotplug_event(&ifbdev->helper);
734 }
735 
736 void intel_fbdev_restore_mode(struct drm_i915_private *dev_priv)
737 {
738 	struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
739 
740 	if (!ifbdev)
741 		return;
742 
743 	intel_fbdev_sync(ifbdev);
744 	if (!ifbdev->vma)
745 		return;
746 
747 	if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper) == 0)
748 		intel_fbdev_invalidate(ifbdev);
749 }
750 
751 struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev *fbdev)
752 {
753 	if (!fbdev || !fbdev->helper.fb)
754 		return NULL;
755 
756 	return to_intel_framebuffer(fbdev->helper.fb);
757 }
758