vbox_main.c@ 78392

Last change on this file since 78392 was 77957, checked in by vboxsync, 6 years ago
Additions/linux/vboxvideo: make driver work with Linux 5.1. Clean up previous. bugref:4567: Linux kernel driver maintenance.
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 16.7 KB

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1	/* $Id: vbox_main.c 77957 2019-03-29 18:05:32Z vboxsync $ */
2	/** @file
3	* VirtualBox Additions Linux kernel video driver
4	*/
5
6	/*
7	* Copyright (C) 2013-2019 Oracle Corporation
8	* This file is based on ast_main.c
9	* Copyright 2012 Red Hat Inc.
10	*
11	* Permission is hereby granted, free of charge, to any person obtaining a
12	* copy of this software and associated documentation files (the
13	* "Software"), to deal in the Software without restriction, including
14	* without limitation the rights to use, copy, modify, merge, publish,
15	* distribute, sub license, and/or sell copies of the Software, and to
16	* permit persons to whom the Software is furnished to do so, subject to
17	* the following conditions:
18	*
19	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21	* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
22	* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
23	* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
24	* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
25	* USE OR OTHER DEALINGS IN THE SOFTWARE.
26	*
27	* The above copyright notice and this permission notice (including the
28	* next paragraph) shall be included in all copies or substantial portions
29	* of the Software.
30	*
31	* Authors: Dave Airlie <[email protected]>,
32	* Michael Thayer <[email protected],
33	* Hans de Goede <[email protected]>
34	*/
35	#include "vbox_drv.h"
36	#include <drm/drm_fb_helper.h>
37	#include <drm/drm_crtc_helper.h>
38
39	#include <VBoxVideoGuest.h>
40	#include <VBoxVideoVBE.h>
41
42	#include "hgsmi_channels.h"
43
44	static void vbox_user_framebuffer_destroy(struct drm_framebuffer *fb)
45	{
46	struct vbox_framebuffer *vbox_fb = to_vbox_framebuffer(fb);
47
48	if (vbox_fb->obj)
49	drm_gem_object_put_unlocked(vbox_fb->obj);
50
51	drm_framebuffer_cleanup(fb);
52	kfree(fb);
53	}
54
55	void vbox_enable_accel(struct vbox_private *vbox)
56	{
57	unsigned int i;
58	struct VBVABUFFER *vbva;
59
60	if (!vbox->vbva_info \|\| !vbox->vbva_buffers) {
61	/* Should never happen... */
62	DRM_ERROR("vboxvideo: failed to set up VBVA.\n");
63	return;
64	}
65
66	for (i = 0; i < vbox->num_crtcs; ++i) {
67	if (vbox->vbva_info[i].pVBVA)
68	continue;
69
70	vbva = (void __force *)vbox->vbva_buffers +
71	i * VBVA_MIN_BUFFER_SIZE;
72	if (!VBoxVBVAEnable(&vbox->vbva_info[i],
73	vbox->guest_pool, vbva, i)) {
74	/* very old host or driver error. */
75	DRM_ERROR("vboxvideo: vbva_enable failed\n");
76	return;
77	}
78	}
79	}
80
81	void vbox_disable_accel(struct vbox_private *vbox)
82	{
83	unsigned int i;
84
85	for (i = 0; i < vbox->num_crtcs; ++i)
86	VBoxVBVADisable(&vbox->vbva_info[i], vbox->guest_pool, i);
87	}
88
89	void vbox_report_caps(struct vbox_private *vbox)
90	{
91	u32 caps = VBVACAPS_DISABLE_CURSOR_INTEGRATION \|
92	VBVACAPS_IRQ \| VBVACAPS_USE_VBVA_ONLY;
93
94	if (vbox->initial_mode_queried)
95	caps \|= VBVACAPS_VIDEO_MODE_HINTS;
96
97	VBoxHGSMISendCapsInfo(vbox->guest_pool, caps);
98	}
99
100	/**
101	* Send information about dirty rectangles to VBVA. If necessary we enable
102	* VBVA first, as this is normally disabled after a change of master in case
103	* the new master does not send dirty rectangle information (is this even
104	* allowed?)
105	*/
106	void vbox_framebuffer_dirty_rectangles(struct drm_framebuffer *fb,
107	struct drm_clip_rect *rects,
108	unsigned int num_rects)
109	{
110	struct vbox_private *vbox = fb->dev->dev_private;
111	struct drm_crtc *crtc;
112	unsigned int i;
113
114	/* The user can send rectangles, we do not need the timer. */
115	vbox->need_refresh_timer = false;
116	mutex_lock(&vbox->hw_mutex);
117	list_for_each_entry(crtc, &fb->dev->mode_config.crtc_list, head) {
118	if (CRTC_FB(crtc) != fb)
119	continue;
120
121	for (i = 0; i < num_rects; ++i) {
122	VBVACMDHDR cmd_hdr;
123	unsigned int crtc_id = to_vbox_crtc(crtc)->crtc_id;
124
125	if ((rects[i].x1 > crtc->x + crtc->hwmode.hdisplay) \|\|
126	(rects[i].y1 > crtc->y + crtc->hwmode.vdisplay) \|\|
127	(rects[i].x2 < crtc->x) \|\|
128	(rects[i].y2 < crtc->y))
129	continue;
130
131	cmd_hdr.x = (s16)rects[i].x1;
132	cmd_hdr.y = (s16)rects[i].y1;
133	cmd_hdr.w = (u16)rects[i].x2 - rects[i].x1;
134	cmd_hdr.h = (u16)rects[i].y2 - rects[i].y1;
135
136	if (!VBoxVBVABufferBeginUpdate(&vbox->vbva_info[crtc_id],
137	vbox->guest_pool))
138	continue;
139
140	VBoxVBVAWrite(&vbox->vbva_info[crtc_id], vbox->guest_pool,
141	&cmd_hdr, sizeof(cmd_hdr));
142	VBoxVBVABufferEndUpdate(&vbox->vbva_info[crtc_id]);
143	}
144	}
145	mutex_unlock(&vbox->hw_mutex);
146	}
147
148	static int vbox_user_framebuffer_dirty(struct drm_framebuffer *fb,
149	struct drm_file *file_priv,
150	unsigned int flags, unsigned int color,
151	struct drm_clip_rect *rects,
152	unsigned int num_rects)
153	{
154	vbox_framebuffer_dirty_rectangles(fb, rects, num_rects);
155
156	return 0;
157	}
158
159	static const struct drm_framebuffer_funcs vbox_fb_funcs = {
160	.destroy = vbox_user_framebuffer_destroy,
161	.dirty = vbox_user_framebuffer_dirty,
162	};
163
164	int vbox_framebuffer_init(struct drm_device *dev,
165	struct vbox_framebuffer *vbox_fb,
166	#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 5, 0) \|\| defined(RHEL_73)
167	const struct DRM_MODE_FB_CMD *mode_cmd,
168	#else
169	struct DRM_MODE_FB_CMD *mode_cmd,
170	#endif
171	struct drm_gem_object *obj)
172	{
173	int ret;
174
175	#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0) \|\| defined(RHEL_75)
176	drm_helper_mode_fill_fb_struct(dev, &vbox_fb->base, mode_cmd);
177	#else
178	drm_helper_mode_fill_fb_struct(&vbox_fb->base, mode_cmd);
179	#endif
180	vbox_fb->obj = obj;
181	ret = drm_framebuffer_init(dev, &vbox_fb->base, &vbox_fb_funcs);
182	if (ret) {
183	DRM_ERROR("framebuffer init failed %d\n", ret);
184	return ret;
185	}
186
187	return 0;
188	}
189
190	static struct drm_framebuffer *vbox_user_framebuffer_create(
191	struct drm_device *dev,
192	struct drm_file *filp,
193	#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 5, 0) \|\| defined(RHEL_73)
194	const struct drm_mode_fb_cmd2 *mode_cmd)
195	#else
196	struct drm_mode_fb_cmd2 *mode_cmd)
197	#endif
198	{
199	struct drm_gem_object *obj;
200	struct vbox_framebuffer *vbox_fb;
201	int ret = -ENOMEM;
202
203	#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0) \|\| defined(RHEL_74)
204	obj = drm_gem_object_lookup(filp, mode_cmd->handles[0]);
205	#else
206	obj = drm_gem_object_lookup(dev, filp, mode_cmd->handles[0]);
207	#endif
208	if (!obj)
209	return ERR_PTR(-ENOENT);
210
211	vbox_fb = kzalloc(sizeof(*vbox_fb), GFP_KERNEL);
212	if (!vbox_fb)
213	goto err_unref_obj;
214
215	ret = vbox_framebuffer_init(dev, vbox_fb, mode_cmd, obj);
216	if (ret)
217	goto err_free_vbox_fb;
218
219	return &vbox_fb->base;
220
221	err_free_vbox_fb:
222	kfree(vbox_fb);
223	err_unref_obj:
224	drm_gem_object_put_unlocked(obj);
225	return ERR_PTR(ret);
226	}
227
228	static const struct drm_mode_config_funcs vbox_mode_funcs = {
229	.fb_create = vbox_user_framebuffer_create,
230	};
231
232	#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 0, 0) && !defined(RHEL_73)
233	#define pci_iomap_range(dev, bar, offset, maxlen) \
234	ioremap(pci_resource_start(dev, bar) + (offset), maxlen)
235	#endif
236
237	/**
238	* Tell the host about the views. This design originally targeted the
239	* Windows XP driver architecture and assumed that each screen would
240	* have a dedicated frame buffer with the command buffer following it,
241	* the whole being a "view". The host works out which screen a command
242	* buffer belongs to by checking whether it is in the first view, then
243	* whether it is in the second and so on. The first match wins. We
244	* cheat around this by making the first view be the managed memory
245	* plus the first command buffer, the second the same plus the second
246	* buffer and so on.
247	*/
248	static int vbox_set_views(struct vbox_private *vbox)
249	{
250	VBVAINFOVIEW *p;
251	int i;
252
253	p = VBoxHGSMIBufferAlloc(vbox->guest_pool, sizeof(*p),
254	HGSMI_CH_VBVA, VBVA_INFO_VIEW);
255	if (!p)
256	return -ENOMEM;
257
258	for (i = 0; i < vbox->num_crtcs; ++i) {
259	p->u32ViewIndex = i;
260	p->u32ViewOffset = 0;
261	p->u32ViewSize = vbox->available_vram_size +
262	i * VBVA_MIN_BUFFER_SIZE;
263	p->u32MaxScreenSize = vbox->available_vram_size;
264
265	VBoxHGSMIBufferSubmit(vbox->guest_pool, p);
266	}
267
268	VBoxHGSMIBufferFree(vbox->guest_pool, p);
269
270	return 0;
271	}
272
273	static int vbox_accel_init(struct vbox_private *vbox)
274	{
275	unsigned int i, ret;
276
277	vbox->vbva_info = devm_kcalloc(vbox->dev->dev, vbox->num_crtcs,
278	sizeof(*vbox->vbva_info), GFP_KERNEL);
279	if (!vbox->vbva_info)
280	return -ENOMEM;
281
282	/* Take a command buffer for each screen from the end of usable VRAM. */
283	vbox->available_vram_size -= vbox->num_crtcs * VBVA_MIN_BUFFER_SIZE;
284
285	vbox->vbva_buffers = pci_iomap_range(vbox->dev->pdev, 0,
286	vbox->available_vram_size,
287	vbox->num_crtcs *
288	VBVA_MIN_BUFFER_SIZE);
289	if (!vbox->vbva_buffers)
290	return -ENOMEM;
291
292	for (i = 0; i < vbox->num_crtcs; ++i)
293	VBoxVBVASetupBufferContext(&vbox->vbva_info[i],
294	vbox->available_vram_size +
295	i * VBVA_MIN_BUFFER_SIZE,
296	VBVA_MIN_BUFFER_SIZE);
297
298	vbox_enable_accel(vbox);
299	ret = vbox_set_views(vbox);
300	if (ret)
301	goto err_pci_iounmap;
302
303	return 0;
304
305	err_pci_iounmap:
306	pci_iounmap(vbox->dev->pdev, vbox->vbva_buffers);
307	return ret;
308	}
309
310	static void vbox_accel_fini(struct vbox_private *vbox)
311	{
312	vbox_disable_accel(vbox);
313	pci_iounmap(vbox->dev->pdev, vbox->vbva_buffers);
314	}
315
316	/** Do we support the 4.3 plus mode hint reporting interface? */
317	static bool have_hgsmi_mode_hints(struct vbox_private *vbox)
318	{
319	u32 have_hints, have_cursor;
320	int ret;
321
322	ret = VBoxQueryConfHGSMI(vbox->guest_pool,
323	VBOX_VBVA_CONF32_MODE_HINT_REPORTING,
324	&have_hints);
325	if (ret)
326	return false;
327
328	ret = VBoxQueryConfHGSMI(vbox->guest_pool,
329	VBOX_VBVA_CONF32_GUEST_CURSOR_REPORTING,
330	&have_cursor);
331	if (ret)
332	return false;
333
334	return have_hints == VINF_SUCCESS && have_cursor == VINF_SUCCESS;
335	}
336
337	/**
338	* Our refresh timer call-back. Only used for guests without dirty rectangle
339	* support.
340	*/
341	static void vbox_refresh_timer(struct work_struct *work)
342	{
343	struct vbox_private *vbox = container_of(work, struct vbox_private,
344	refresh_work.work);
345	bool have_unblanked = false;
346	struct drm_crtc *crtci;
347
348	if (!vbox->need_refresh_timer)
349	return;
350	list_for_each_entry(crtci, &vbox->dev->mode_config.crtc_list, head) {
351	struct vbox_crtc *vbox_crtc = to_vbox_crtc(crtci);
352	if (crtci->enabled && !vbox_crtc->blanked)
353	have_unblanked = true;
354	}
355	if (!have_unblanked)
356	return;
357	/* This forces a full refresh. */
358	vbox_enable_accel(vbox);
359	/* Schedule the next timer iteration. */
360	schedule_delayed_work(&vbox->refresh_work, VBOX_REFRESH_PERIOD);
361	}
362
363	static bool vbox_check_supported(u16 id)
364	{
365	u16 dispi_id;
366
367	vbox_write_ioport(VBE_DISPI_INDEX_ID, id);
368	dispi_id = inw(VBE_DISPI_IOPORT_DATA);
369
370	return dispi_id == id;
371	}
372
373	/**
374	* Set up our heaps and data exchange buffers in VRAM before handing the rest
375	* to the memory manager.
376	*/
377	static int vbox_hw_init(struct vbox_private *vbox)
378	{
379	int ret = -ENOMEM;
380
381	vbox->full_vram_size = inl(VBE_DISPI_IOPORT_DATA);
382	vbox->any_pitch = vbox_check_supported(VBE_DISPI_ID_ANYX);
383
384	DRM_INFO("VRAM %08x\n", vbox->full_vram_size);
385
386	/* Map guest-heap at end of vram */
387	vbox->guest_heap =
388	pci_iomap_range(vbox->dev->pdev, 0, GUEST_HEAP_OFFSET(vbox),
389	GUEST_HEAP_SIZE);
390	if (!vbox->guest_heap)
391	return -ENOMEM;
392
393	/* Create guest-heap mem-pool use 2^4 = 16 byte chunks */
394	vbox->guest_pool = gen_pool_create(4, -1);
395	if (!vbox->guest_pool)
396	goto err_unmap_guest_heap;
397
398	ret = gen_pool_add_virt(vbox->guest_pool,
399	(unsigned long)vbox->guest_heap,
400	GUEST_HEAP_OFFSET(vbox),
401	GUEST_HEAP_USABLE_SIZE, -1);
402	if (ret)
403	goto err_destroy_guest_pool;
404
405	/* Reduce available VRAM size to reflect the guest heap. */
406	vbox->available_vram_size = GUEST_HEAP_OFFSET(vbox);
407	/* Linux drm represents monitors as a 32-bit array. */
408	VBoxQueryConfHGSMI(vbox->guest_pool, VBOX_VBVA_CONF32_MONITOR_COUNT,
409	&vbox->num_crtcs);
410	vbox->num_crtcs = clamp_t(u32, vbox->num_crtcs, 1, VBOX_MAX_SCREENS);
411
412	if (!have_hgsmi_mode_hints(vbox)) {
413	ret = -ENOTSUPP;
414	goto err_destroy_guest_pool;
415	}
416
417	vbox->last_mode_hints = devm_kcalloc(vbox->dev->dev, vbox->num_crtcs,
418	sizeof(VBVAMODEHINT),
419	GFP_KERNEL);
420	if (!vbox->last_mode_hints) {
421	ret = -ENOMEM;
422	goto err_destroy_guest_pool;
423	}
424
425	ret = vbox_accel_init(vbox);
426	if (ret)
427	goto err_destroy_guest_pool;
428
429	/* Set up the refresh timer for users which do not send dirty rectangles. */
430	INIT_DELAYED_WORK(&vbox->refresh_work, vbox_refresh_timer);
431
432	return 0;
433
434	err_destroy_guest_pool:
435	gen_pool_destroy(vbox->guest_pool);
436	err_unmap_guest_heap:
437	pci_iounmap(vbox->dev->pdev, vbox->guest_heap);
438	return ret;
439	}
440
441	static void vbox_hw_fini(struct vbox_private *vbox)
442	{
443	vbox->need_refresh_timer = false;
444	cancel_delayed_work(&vbox->refresh_work);
445	vbox_accel_fini(vbox);
446	gen_pool_destroy(vbox->guest_pool);
447	pci_iounmap(vbox->dev->pdev, vbox->guest_heap);
448	}
449
450	#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 19, 0)
451	int vbox_driver_load(struct drm_device *dev, unsigned long flags)
452	#else
453	int vbox_driver_load(struct drm_device *dev)
454	#endif
455	{
456	struct vbox_private *vbox;
457	int ret = 0;
458
459	if (!vbox_check_supported(VBE_DISPI_ID_HGSMI))
460	return -ENODEV;
461
462	vbox = devm_kzalloc(dev->dev, sizeof(*vbox), GFP_KERNEL);
463	if (!vbox)
464	return -ENOMEM;
465
466	dev->dev_private = vbox;
467	vbox->dev = dev;
468
469	mutex_init(&vbox->hw_mutex);
470
471	ret = vbox_hw_init(vbox);
472	if (ret)
473	return ret;
474
475	ret = vbox_mm_init(vbox);
476	if (ret)
477	goto err_hw_fini;
478
479	drm_mode_config_init(dev);
480
481	dev->mode_config.funcs = (void *)&vbox_mode_funcs;
482	dev->mode_config.min_width = 64;
483	dev->mode_config.min_height = 64;
484	dev->mode_config.preferred_depth = 24;
485	dev->mode_config.max_width = VBE_DISPI_MAX_XRES;
486	dev->mode_config.max_height = VBE_DISPI_MAX_YRES;
487
488	ret = vbox_mode_init(dev);
489	if (ret)
490	goto err_drm_mode_cleanup;
491
492	ret = vbox_irq_init(vbox);
493	if (ret)
494	goto err_mode_fini;
495
496	ret = vbox_fbdev_init(dev);
497	if (ret)
498	goto err_irq_fini;
499
500	return 0;
501
502	err_irq_fini:
503	vbox_irq_fini(vbox);
504	err_mode_fini:
505	vbox_mode_fini(dev);
506	err_drm_mode_cleanup:
507	drm_mode_config_cleanup(dev);
508	vbox_mm_fini(vbox);
509	err_hw_fini:
510	vbox_hw_fini(vbox);
511	return ret;
512	}
513
514	#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0) \|\| defined(RHEL_75)
515	void vbox_driver_unload(struct drm_device *dev)
516	#else
517	int vbox_driver_unload(struct drm_device *dev)
518	#endif
519	{
520	struct vbox_private *vbox = dev->dev_private;
521
522	vbox_fbdev_fini(dev);
523	vbox_irq_fini(vbox);
524	vbox_mode_fini(dev);
525	drm_mode_config_cleanup(dev);
526	vbox_mm_fini(vbox);
527	vbox_hw_fini(vbox);
528	#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 11, 0) && !defined(RHEL_75)
529	return 0;
530	#endif
531	}
532
533	/**
534	* @note this is described in the DRM framework documentation. AST does not
535	* have it, but we get an oops on driver unload if it is not present.
536	*/
537	void vbox_driver_lastclose(struct drm_device *dev)
538	{
539	struct vbox_private *vbox = dev->dev_private;
540
541	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 16, 0) \|\| defined(RHEL_71)
542	if (vbox->fbdev)
543	drm_fb_helper_restore_fbdev_mode_unlocked(&vbox->fbdev->helper);
544	#else
545	drm_modeset_lock_all(dev);
546	if (vbox->fbdev)
547	drm_fb_helper_restore_fbdev_mode(&vbox->fbdev->helper);
548	drm_modeset_unlock_all(dev);
549	#endif
550	}
551
552	int vbox_gem_create(struct drm_device *dev,
553	u32 size, bool iskernel, struct drm_gem_object **obj)
554	{
555	struct vbox_bo *vboxbo;
556	int ret;
557
558	*obj = NULL;
559
560	size = roundup(size, PAGE_SIZE);
561	if (size == 0)
562	return -EINVAL;
563
564	ret = vbox_bo_create(dev, size, 0, 0, &vboxbo);
565	if (ret) {
566	if (ret != -ERESTARTSYS)
567	DRM_ERROR("failed to allocate GEM object\n");
568	return ret;
569	}
570
571	*obj = &vboxbo->gem;
572
573	return 0;
574	}
575
576	int vbox_dumb_create(struct drm_file *file,
577	struct drm_device dev, struct drm_mode_create_dumb args)
578	{
579	int ret;
580	struct drm_gem_object *gobj;
581	u32 handle;
582
583	args->pitch = args->width * ((args->bpp + 7) / 8);
584	args->size = args->pitch * args->height;
585
586	ret = vbox_gem_create(dev, args->size, false, &gobj);
587	if (ret)
588	return ret;
589
590	ret = drm_gem_handle_create(file, gobj, &handle);
591	drm_gem_object_put_unlocked(gobj);
592	if (ret)
593	return ret;
594
595	args->handle = handle;
596
597	return 0;
598	}
599
600	#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 12, 0) && !defined(RHEL_73)
601	int vbox_dumb_destroy(struct drm_file *file,
602	struct drm_device *dev, u32 handle)
603	{
604	return drm_gem_handle_delete(file, handle);
605	}
606	#endif
607
608	#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 19, 0)
609	static void ttm_bo_put(struct ttm_buffer_object *bo)
610	{
611	ttm_bo_unref(&bo);
612	}
613	#endif
614
615	void vbox_gem_free_object(struct drm_gem_object *obj)
616	{
617	struct vbox_bo *vbox_bo = gem_to_vbox_bo(obj);
618
619	ttm_bo_put(&vbox_bo->bo);
620	}
621
622	static inline u64 vbox_bo_mmap_offset(struct vbox_bo *bo)
623	{
624	#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 12, 0) && !defined(RHEL_70)
625	return bo->bo.addr_space_offset;
626	#else
627	return drm_vma_node_offset_addr(&bo->bo.vma_node);
628	#endif
629	}
630
631	int
632	vbox_dumb_mmap_offset(struct drm_file *file,
633	struct drm_device *dev,
634	u32 handle, u64 *offset)
635	{
636	struct drm_gem_object *obj;
637	int ret;
638	struct vbox_bo *bo;
639
640	mutex_lock(&dev->struct_mutex);
641	#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0) \|\| defined(RHEL_74)
642	obj = drm_gem_object_lookup(file, handle);
643	#else
644	obj = drm_gem_object_lookup(dev, file, handle);
645	#endif
646	if (!obj) {
647	ret = -ENOENT;
648	goto out_unlock;
649	}
650
651	bo = gem_to_vbox_bo(obj);
652	*offset = vbox_bo_mmap_offset(bo);
653
654	drm_gem_object_put(obj);
655	ret = 0;
656
657	out_unlock:
658	mutex_unlock(&dev->struct_mutex);
659	return ret;
660	}

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source: vbox/trunk/src/VBox/Additions/linux/drm/vbox_main.c@ 78392

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