SUPDrv-linux.c@ 34856

Last change on this file since 34856 was 34856, checked in by vboxsync, 14 years ago
The gip timer is not high-res on linux.
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File size: 23.1 KB

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1	/* $Rev: 34856 $ */
2	/** @file
3	* VBoxDrv - The VirtualBox Support Driver - Linux specifics.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27	/*******************************************************************************
28	* Header Files *
29	*******************************************************************************/
30	#define LOG_GROUP LOG_GROUP_SUP_DRV
31	#include "../SUPDrvInternal.h"
32	#include "the-linux-kernel.h"
33	#include "version-generated.h"
34	#include "product-generated.h"
35
36	#include <iprt/assert.h>
37	#include <iprt/spinlock.h>
38	#include <iprt/semaphore.h>
39	#include <iprt/initterm.h>
40	#include <iprt/process.h>
41	#include <VBox/err.h>
42	#include <iprt/mem.h>
43	#include <VBox/log.h>
44	#include <iprt/mp.h>
45
46	/** @todo figure out the exact version number */
47	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 16)
48	# include <iprt/power.h>
49	# define VBOX_WITH_SUSPEND_NOTIFICATION
50	#endif
51
52	#include <linux/sched.h>
53	#ifdef CONFIG_DEVFS_FS
54	# include <linux/devfs_fs_kernel.h>
55	#endif
56	#ifdef CONFIG_VBOXDRV_AS_MISC
57	# include <linux/miscdevice.h>
58	#endif
59	#ifdef VBOX_WITH_SUSPEND_NOTIFICATION
60	# include <linux/platform_device.h>
61	#endif
62
63	#include <iprt/mem.h>
64
65
66	/*******************************************************************************
67	* Defined Constants And Macros *
68	*******************************************************************************/
69	/* check kernel version */
70	# ifndef SUPDRV_AGNOSTIC
71	# if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0)
72	# error Unsupported kernel version!
73	# endif
74	# endif
75
76	/* devfs defines */
77	#if defined(CONFIG_DEVFS_FS) && !defined(CONFIG_VBOXDRV_AS_MISC)
78	# ifdef VBOX_WITH_HARDENING
79	# define VBOX_DEV_FMASK (S_IWUSR \| S_IRUSR)
80	# else
81	# define VBOX_DEV_FMASK (S_IRUGO \| S_IWUGO)
82	# endif
83	#endif /* CONFIG_DEV_FS && !CONFIG_VBOXDEV_AS_MISC */
84
85	#ifdef CONFIG_X86_HIGH_ENTRY
86	# error "CONFIG_X86_HIGH_ENTRY is not supported by VBoxDrv at this time."
87	#endif
88
89
90	/*******************************************************************************
91	* Internal Functions *
92	*******************************************************************************/
93	static int VBoxDrvLinuxInit(void);
94	static void VBoxDrvLinuxUnload(void);
95	static int VBoxDrvLinuxCreate(struct inode pInode, struct file pFilp);
96	static int VBoxDrvLinuxClose(struct inode pInode, struct file pFilp);
97	#ifdef HAVE_UNLOCKED_IOCTL
98	static long VBoxDrvLinuxIOCtl(struct file *pFilp, unsigned int uCmd, unsigned long ulArg);
99	#else
100	static int VBoxDrvLinuxIOCtl(struct inode pInode, struct file pFilp, unsigned int uCmd, unsigned long ulArg);
101	#endif
102	static int VBoxDrvLinuxIOCtlSlow(struct file *pFilp, unsigned int uCmd, unsigned long ulArg);
103	static int VBoxDrvLinuxErr2LinuxErr(int);
104	#ifdef VBOX_WITH_SUSPEND_NOTIFICATION
105	static int VBoxDrvProbe(struct platform_device *pDev);
106	# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
107	static int VBoxDrvSuspend(struct device *pDev);
108	static int VBoxDrvResume(struct device *pDev);
109	# else
110	static int VBoxDrvSuspend(struct platform_device *pDev, pm_message_t State);
111	static int VBoxDrvResume(struct platform_device *pDev);
112	# endif
113	static void VBoxDevRelease(struct device *pDev);
114	#endif
115
116
117	/*******************************************************************************
118	* Global Variables *
119	*******************************************************************************/
120	/**
121	* Device extention & session data association structure.
122	*/
123	static SUPDRVDEVEXT g_DevExt;
124
125	#ifndef CONFIG_VBOXDRV_AS_MISC
126	/** Module major number */
127	#define DEVICE_MAJOR 234
128	/** Saved major device number */
129	static int g_iModuleMajor;
130	#endif /* !CONFIG_VBOXDRV_AS_MISC */
131
132	/** Module parameter.
133	* Not prefixed because the name is used by macros and the end of this file. */
134	static int force_async_tsc = 0;
135
136	/** The module name. */
137	#define DEVICE_NAME "vboxdrv"
138
139	#ifdef RT_ARCH_AMD64
140	/**
141	* Memory for the executable memory heap (in IPRT).
142	*/
143	extern uint8_t g_abExecMemory[1572864]; /* 1.5 MB */
144	__asm__(".section execmemory, \"awx\", @progbits\n\t"
145	".align 32\n\t"
146	".globl g_abExecMemory\n"
147	"g_abExecMemory:\n\t"
148	".zero 1572864\n\t"
149	".type g_abExecMemory, @object\n\t"
150	".size g_abExecMemory, 1572864\n\t"
151	".text\n\t");
152	#endif
153
154	/** The file_operations structure. */
155	static struct file_operations gFileOpsVBoxDrv =
156	{
157	owner: THIS_MODULE,
158	open: VBoxDrvLinuxCreate,
159	release: VBoxDrvLinuxClose,
160	#ifdef HAVE_UNLOCKED_IOCTL
161	unlocked_ioctl: VBoxDrvLinuxIOCtl,
162	#else
163	ioctl: VBoxDrvLinuxIOCtl,
164	#endif
165	};
166
167	#ifdef CONFIG_VBOXDRV_AS_MISC
168	/** The miscdevice structure. */
169	static struct miscdevice gMiscDevice =
170	{
171	minor: MISC_DYNAMIC_MINOR,
172	name: DEVICE_NAME,
173	fops: &gFileOpsVBoxDrv,
174	# if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 17)
175	devfs_name: DEVICE_NAME,
176	# endif
177	};
178	#endif
179
180
181	#ifdef VBOX_WITH_SUSPEND_NOTIFICATION
182	# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
183	static struct dev_pm_ops gPlatformPMOps =
184	{
185	.suspend = VBoxDrvSuspend, /* before entering deep sleep */
186	.resume = VBoxDrvResume, /* after wakeup from deep sleep */
187	.freeze = VBoxDrvSuspend, /* before creating hibernation image */
188	.restore = VBoxDrvResume, /* after waking up from hibernation */
189	};
190	# endif
191
192	static struct platform_driver gPlatformDriver =
193	{
194	.probe = VBoxDrvProbe,
195	# if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 30)
196	.suspend = VBoxDrvSuspend,
197	.resume = VBoxDrvResume,
198	# endif
199	/** @todo .shutdown? */
200	.driver =
201	{
202	.name = "vboxdrv",
203	# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
204	.pm = &gPlatformPMOps,
205	# endif
206	}
207	};
208
209	static struct platform_device gPlatformDevice =
210	{
211	.name = "vboxdrv",
212	.dev =
213	{
214	.release = VBoxDevRelease
215	}
216	};
217	#endif /* VBOX_WITH_SUSPEND_NOTIFICATION */
218
219
220	DECLINLINE(RTUID) vboxdrvLinuxUid(void)
221	{
222	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29)
223	return current->cred->uid;
224	#else
225	return current->uid;
226	#endif
227	}
228
229	DECLINLINE(RTGID) vboxdrvLinuxGid(void)
230	{
231	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29)
232	return current->cred->gid;
233	#else
234	return current->gid;
235	#endif
236	}
237
238	DECLINLINE(RTUID) vboxdrvLinuxEuid(void)
239	{
240	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29)
241	return current->cred->euid;
242	#else
243	return current->euid;
244	#endif
245	}
246
247	/**
248	* Initialize module.
249	*
250	* @returns appropriate status code.
251	*/
252	static int __init VBoxDrvLinuxInit(void)
253	{
254	int rc;
255
256	/*
257	* Check for synchronous/asynchronous TSC mode.
258	*/
259	printk(KERN_DEBUG DEVICE_NAME ": Found %u processor cores.\n", (unsigned)RTMpGetOnlineCount());
260	#ifdef CONFIG_VBOXDRV_AS_MISC
261	rc = misc_register(&gMiscDevice);
262	if (rc)
263	{
264	printk(KERN_ERR DEVICE_NAME ": Can't register misc device! rc=%d\n", rc);
265	return rc;
266	}
267	#else /* !CONFIG_VBOXDRV_AS_MISC */
268	/*
269	* Register character device.
270	*/
271	g_iModuleMajor = DEVICE_MAJOR;
272	rc = register_chrdev((dev_t)g_iModuleMajor, DEVICE_NAME, &gFileOpsVBoxDrv);
273	if (rc < 0)
274	{
275	Log(("register_chrdev() failed with rc=%#x!\n", rc));
276	return rc;
277	}
278
279	/*
280	* Save returned module major number
281	*/
282	if (DEVICE_MAJOR != 0)
283	g_iModuleMajor = DEVICE_MAJOR;
284	else
285	g_iModuleMajor = rc;
286	rc = 0;
287
288	# ifdef CONFIG_DEVFS_FS
289	/*
290	* Register a device entry
291	*/
292	if (devfs_mk_cdev(MKDEV(DEVICE_MAJOR, 0), S_IFCHR \| VBOX_DEV_FMASK, DEVICE_NAME) != 0)
293	{
294	Log(("devfs_register failed!\n"));
295	rc = -EINVAL;
296	}
297	# endif
298	#endif /* !CONFIG_VBOXDRV_AS_MISC */
299	if (!rc)
300	{
301	/*
302	* Initialize the runtime.
303	* On AMD64 we'll have to donate the high rwx memory block to the exec allocator.
304	*/
305	rc = RTR0Init(0);
306	if (RT_SUCCESS(rc))
307	{
308	#ifdef RT_ARCH_AMD64
309	rc = RTR0MemExecDonate(&g_abExecMemory[0], sizeof(g_abExecMemory));
310	printk(KERN_DEBUG "VBoxDrv: dbg - g_abExecMemory=%p\n", (void *)&g_abExecMemory[0]);
311	#endif
312	Log(("VBoxDrv::ModuleInit\n"));
313
314	/*
315	* Initialize the device extension.
316	*/
317	if (RT_SUCCESS(rc))
318	rc = supdrvInitDevExt(&g_DevExt, sizeof(SUPDRVSESSION));
319	if (RT_SUCCESS(rc))
320	{
321	#ifdef VBOX_WITH_SUSPEND_NOTIFICATION
322	rc = platform_driver_register(&gPlatformDriver);
323	if (rc == 0)
324	{
325	rc = platform_device_register(&gPlatformDevice);
326	if (rc == 0)
327	#endif
328	{
329	printk(KERN_INFO DEVICE_NAME ": TSC mode is %s, kernel timer mode is 'normal'.\n",
330	g_DevExt.pGip->u32Mode == SUPGIPMODE_SYNC_TSC ? "'synchronous'" : "'asynchronous'");
331	LogFlow(("VBoxDrv::ModuleInit returning %#x\n", rc));
332	printk(KERN_DEBUG DEVICE_NAME ": Successfully loaded version "
333	VBOX_VERSION_STRING " (interface " RT_XSTR(SUPDRV_IOC_VERSION) ").\n");
334	return rc;
335	}
336	#ifdef VBOX_WITH_SUSPEND_NOTIFICATION
337	else
338	platform_driver_unregister(&gPlatformDriver);
339	}
340	#endif
341	}
342
343	rc = -EINVAL;
344	RTR0TermForced();
345	}
346	else
347	rc = -EINVAL;
348
349	/*
350	* Failed, cleanup and return the error code.
351	*/
352	#if defined(CONFIG_DEVFS_FS) && !defined(CONFIG_VBOXDRV_AS_MISC)
353	devfs_remove(DEVICE_NAME);
354	#endif
355	}
356	#ifdef CONFIG_VBOXDRV_AS_MISC
357	misc_deregister(&gMiscDevice);
358	Log(("VBoxDrv::ModuleInit returning %#x (minor:%d)\n", rc, gMiscDevice.minor));
359	#else
360	unregister_chrdev(g_iModuleMajor, DEVICE_NAME);
361	Log(("VBoxDrv::ModuleInit returning %#x (major:%d)\n", rc, g_iModuleMajor));
362	#endif
363	return rc;
364	}
365
366
367	/**
368	* Unload the module.
369	*/
370	static void __exit VBoxDrvLinuxUnload(void)
371	{
372	int rc;
373	Log(("VBoxDrvLinuxUnload\n"));
374	NOREF(rc);
375
376	#ifdef VBOX_WITH_SUSPEND_NOTIFICATION
377	platform_device_unregister(&gPlatformDevice);
378	platform_driver_unregister(&gPlatformDriver);
379	#endif
380
381	/*
382	* I Don't think it's possible to unload a driver which processes have
383	* opened, at least we'll blindly assume that here.
384	*/
385	#ifdef CONFIG_VBOXDRV_AS_MISC
386	rc = misc_deregister(&gMiscDevice);
387	if (rc < 0)
388	{
389	Log(("misc_deregister failed with rc=%#x\n", rc));
390	}
391	#else /* !CONFIG_VBOXDRV_AS_MISC */
392	# ifdef CONFIG_DEVFS_FS
393	/*
394	* Unregister a device entry
395	*/
396	devfs_remove(DEVICE_NAME);
397	# endif /* devfs */
398	unregister_chrdev(g_iModuleMajor, DEVICE_NAME);
399	#endif /* !CONFIG_VBOXDRV_AS_MISC */
400
401	/*
402	* Destroy GIP, delete the device extension and terminate IPRT.
403	*/
404	supdrvDeleteDevExt(&g_DevExt);
405	RTR0TermForced();
406	}
407
408
409	/**
410	* Device open. Called on open /dev/vboxdrv
411	*
412	* @param pInode Pointer to inode info structure.
413	* @param pFilp Associated file pointer.
414	*/
415	static int VBoxDrvLinuxCreate(struct inode pInode, struct file pFilp)
416	{
417	int rc;
418	PSUPDRVSESSION pSession;
419	Log(("VBoxDrvLinuxCreate: pFilp=%p pid=%d/%d %s\n", pFilp, RTProcSelf(), current->pid, current->comm));
420
421	#ifdef VBOX_WITH_HARDENING
422	/*
423	* Only root is allowed to access the device, enforce it!
424	*/
425	if (vboxdrvLinuxEuid() != 0 /* root */ )
426	{
427	Log(("VBoxDrvLinuxCreate: euid=%d, expected 0 (root)\n", vboxdrvLinuxEuid()));
428	return -EPERM;
429	}
430	#endif /* VBOX_WITH_HARDENING */
431
432	/*
433	* Call common code for the rest.
434	*/
435	rc = supdrvCreateSession(&g_DevExt, true /* fUser */, &pSession);
436	if (!rc)
437	{
438	pSession->Uid = vboxdrvLinuxUid();
439	pSession->Gid = vboxdrvLinuxGid();
440	}
441
442	pFilp->private_data = pSession;
443
444	Log(("VBoxDrvLinuxCreate: g_DevExt=%p pSession=%p rc=%d/%d (pid=%d/%d %s)\n",
445	&g_DevExt, pSession, rc, VBoxDrvLinuxErr2LinuxErr(rc),
446	RTProcSelf(), current->pid, current->comm));
447	return VBoxDrvLinuxErr2LinuxErr(rc);
448	}
449
450
451	/**
452	* Close device.
453	*
454	* @param pInode Pointer to inode info structure.
455	* @param pFilp Associated file pointer.
456	*/
457	static int VBoxDrvLinuxClose(struct inode pInode, struct file pFilp)
458	{
459	Log(("VBoxDrvLinuxClose: pFilp=%p pSession=%p pid=%d/%d %s\n",
460	pFilp, pFilp->private_data, RTProcSelf(), current->pid, current->comm));
461	supdrvCloseSession(&g_DevExt, (PSUPDRVSESSION)pFilp->private_data);
462	pFilp->private_data = NULL;
463	return 0;
464	}
465
466
467	#ifdef VBOX_WITH_SUSPEND_NOTIFICATION
468	/**
469	* Dummy device release function. We have to provide this function,
470	* otherwise the kernel will complain.
471	*
472	* @param pDev Pointer to the platform device.
473	*/
474	static void VBoxDevRelease(struct device *pDev)
475	{
476	}
477
478	/**
479	* Dummy probe function.
480	*
481	* @param pDev Pointer to the platform device.
482	*/
483	static int VBoxDrvProbe(struct platform_device *pDev)
484	{
485	return 0;
486	}
487
488	/**
489	* Suspend callback.
490	* @param pDev Pointer to the platform device.
491	* @param State message type, see Documentation/power/devices.txt.
492	*/
493	# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
494	static int VBoxDrvSuspend(struct device *pDev)
495	# else
496	static int VBoxDrvSuspend(struct platform_device *pDev, pm_message_t State)
497	# endif
498	{
499	RTPowerSignalEvent(RTPOWEREVENT_SUSPEND);
500	return 0;
501	}
502
503	/**
504	* Resume callback.
505	*
506	* @param pDev Pointer to the platform device.
507	*/
508	# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
509	static int VBoxDrvResume(struct device *pDev)
510	# else
511	static int VBoxDrvResume(struct platform_device *pDev)
512	# endif
513	{
514	RTPowerSignalEvent(RTPOWEREVENT_RESUME);
515	return 0;
516	}
517	#endif /* VBOX_WITH_SUSPEND_NOTIFICATION */
518
519
520	/**
521	* Device I/O Control entry point.
522	*
523	* @param pFilp Associated file pointer.
524	* @param uCmd The function specified to ioctl().
525	* @param ulArg The argument specified to ioctl().
526	*/
527	#ifdef HAVE_UNLOCKED_IOCTL
528	static long VBoxDrvLinuxIOCtl(struct file *pFilp, unsigned int uCmd, unsigned long ulArg)
529	#else
530	static int VBoxDrvLinuxIOCtl(struct inode pInode, struct file pFilp, unsigned int uCmd, unsigned long ulArg)
531	#endif
532	{
533	/*
534	* Deal with the two high-speed IOCtl that takes it's arguments from
535	* the session and iCmd, and only returns a VBox status code.
536	*/
537	#ifdef HAVE_UNLOCKED_IOCTL
538	if (RT_LIKELY( uCmd == SUP_IOCTL_FAST_DO_RAW_RUN
539	\|\| uCmd == SUP_IOCTL_FAST_DO_HWACC_RUN
540	\|\| uCmd == SUP_IOCTL_FAST_DO_NOP))
541	return supdrvIOCtlFast(uCmd, ulArg, &g_DevExt, (PSUPDRVSESSION)pFilp->private_data);
542	return VBoxDrvLinuxIOCtlSlow(pFilp, uCmd, ulArg);
543
544	#else /* !HAVE_UNLOCKED_IOCTL */
545
546	int rc;
547	unlock_kernel();
548	if (RT_LIKELY( uCmd == SUP_IOCTL_FAST_DO_RAW_RUN
549	\|\| uCmd == SUP_IOCTL_FAST_DO_HWACC_RUN
550	\|\| uCmd == SUP_IOCTL_FAST_DO_NOP))
551	rc = supdrvIOCtlFast(uCmd, ulArg, &g_DevExt, (PSUPDRVSESSION)pFilp->private_data);
552	else
553	rc = VBoxDrvLinuxIOCtlSlow(pFilp, uCmd, ulArg);
554	lock_kernel();
555	return rc;
556	#endif /* !HAVE_UNLOCKED_IOCTL */
557	}
558
559
560	/**
561	* Device I/O Control entry point.
562	*
563	* @param pFilp Associated file pointer.
564	* @param uCmd The function specified to ioctl().
565	* @param ulArg The argument specified to ioctl().
566	*/
567	static int VBoxDrvLinuxIOCtlSlow(struct file *pFilp, unsigned int uCmd, unsigned long ulArg)
568	{
569	int rc;
570	SUPREQHDR Hdr;
571	PSUPREQHDR pHdr;
572	uint32_t cbBuf;
573
574	Log6(("VBoxDrvLinuxIOCtl: pFilp=%p uCmd=%#x ulArg=%p pid=%d/%d\n", pFilp, uCmd, (void *)ulArg, RTProcSelf(), current->pid));
575
576	/*
577	* Read the header.
578	*/
579	if (RT_UNLIKELY(copy_from_user(&Hdr, (void *)ulArg, sizeof(Hdr))))
580	{
581	Log(("VBoxDrvLinuxIOCtl: copy_from_user(,%#lx,) failed; uCmd=%#x.\n", ulArg, uCmd));
582	return -EFAULT;
583	}
584	if (RT_UNLIKELY((Hdr.fFlags & SUPREQHDR_FLAGS_MAGIC_MASK) != SUPREQHDR_FLAGS_MAGIC))
585	{
586	Log(("VBoxDrvLinuxIOCtl: bad header magic %#x; uCmd=%#x\n", Hdr.fFlags & SUPREQHDR_FLAGS_MAGIC_MASK, uCmd));
587	return -EINVAL;
588	}
589
590	/*
591	* Buffer the request.
592	*/
593	cbBuf = RT_MAX(Hdr.cbIn, Hdr.cbOut);
594	if (RT_UNLIKELY(cbBuf > _1M*16))
595	{
596	Log(("VBoxDrvLinuxIOCtl: too big cbBuf=%#x; uCmd=%#x\n", cbBuf, uCmd));
597	return -E2BIG;
598	}
599	if (RT_UNLIKELY(cbBuf != _IOC_SIZE(uCmd) && _IOC_SIZE(uCmd)))
600	{
601	Log(("VBoxDrvLinuxIOCtl: bad ioctl cbBuf=%#x _IOC_SIZE=%#x; uCmd=%#x.\n", cbBuf, _IOC_SIZE(uCmd), uCmd));
602	return -EINVAL;
603	}
604	pHdr = RTMemAlloc(cbBuf);
605	if (RT_UNLIKELY(!pHdr))
606	{
607	OSDBGPRINT(("VBoxDrvLinuxIOCtl: failed to allocate buffer of %d bytes for uCmd=%#x.\n", cbBuf, uCmd));
608	return -ENOMEM;
609	}
610	if (RT_UNLIKELY(copy_from_user(pHdr, (void *)ulArg, Hdr.cbIn)))
611	{
612	Log(("VBoxDrvLinuxIOCtl: copy_from_user(,%#lx, %#x) failed; uCmd=%#x.\n", ulArg, Hdr.cbIn, uCmd));
613	RTMemFree(pHdr);
614	return -EFAULT;
615	}
616
617	/*
618	* Process the IOCtl.
619	*/
620	rc = supdrvIOCtl(uCmd, &g_DevExt, (PSUPDRVSESSION)pFilp->private_data, pHdr);
621
622	/*
623	* Copy ioctl data and output buffer back to user space.
624	*/
625	if (RT_LIKELY(!rc))
626	{
627	uint32_t cbOut = pHdr->cbOut;
628	if (RT_UNLIKELY(cbOut > cbBuf))
629	{
630	OSDBGPRINT(("VBoxDrvLinuxIOCtl: too much output! %#x > %#x; uCmd=%#x!\n", cbOut, cbBuf, uCmd));
631	cbOut = cbBuf;
632	}
633	if (RT_UNLIKELY(copy_to_user((void *)ulArg, pHdr, cbOut)))
634	{
635	/* this is really bad! */
636	OSDBGPRINT(("VBoxDrvLinuxIOCtl: copy_to_user(%#lx,,%#x); uCmd=%#x!\n", ulArg, cbOut, uCmd));
637	rc = -EFAULT;
638	}
639	}
640	else
641	{
642	Log(("VBoxDrvLinuxIOCtl: pFilp=%p uCmd=%#x ulArg=%p failed, rc=%d\n", pFilp, uCmd, (void *)ulArg, rc));
643	rc = -EINVAL;
644	}
645	RTMemFree(pHdr);
646
647	Log6(("VBoxDrvLinuxIOCtl: returns %d (pid=%d/%d)\n", rc, RTProcSelf(), current->pid));
648	return rc;
649	}
650
651
652	/**
653	* The SUPDRV IDC entry point.
654	*
655	* @returns VBox status code, see supdrvIDC.
656	* @param iReq The request code.
657	* @param pReq The request.
658	*/
659	int VBOXCALL SUPDrvLinuxIDC(uint32_t uReq, PSUPDRVIDCREQHDR pReq)
660	{
661	PSUPDRVSESSION pSession;
662
663	/*
664	* Some quick validations.
665	*/
666	if (RT_UNLIKELY(!VALID_PTR(pReq)))
667	return VERR_INVALID_POINTER;
668
669	pSession = pReq->pSession;
670	if (pSession)
671	{
672	if (RT_UNLIKELY(!VALID_PTR(pSession)))
673	return VERR_INVALID_PARAMETER;
674	if (RT_UNLIKELY(pSession->pDevExt != &g_DevExt))
675	return VERR_INVALID_PARAMETER;
676	}
677	else if (RT_UNLIKELY(uReq != SUPDRV_IDC_REQ_CONNECT))
678	return VERR_INVALID_PARAMETER;
679
680	/*
681	* Do the job.
682	*/
683	return supdrvIDC(uReq, &g_DevExt, pSession, pReq);
684	}
685
686	EXPORT_SYMBOL(SUPDrvLinuxIDC);
687
688
689	/**
690	* Initializes any OS specific object creator fields.
691	*/
692	void VBOXCALL supdrvOSObjInitCreator(PSUPDRVOBJ pObj, PSUPDRVSESSION pSession)
693	{
694	NOREF(pObj);
695	NOREF(pSession);
696	}
697
698
699	/**
700	* Checks if the session can access the object.
701	*
702	* @returns true if a decision has been made.
703	* @returns false if the default access policy should be applied.
704	*
705	* @param pObj The object in question.
706	* @param pSession The session wanting to access the object.
707	* @param pszObjName The object name, can be NULL.
708	* @param prc Where to store the result when returning true.
709	*/
710	bool VBOXCALL supdrvOSObjCanAccess(PSUPDRVOBJ pObj, PSUPDRVSESSION pSession, const char pszObjName, int prc)
711	{
712	NOREF(pObj);
713	NOREF(pSession);
714	NOREF(pszObjName);
715	NOREF(prc);
716	return false;
717	}
718
719
720	bool VBOXCALL supdrvOSGetForcedAsyncTscMode(PSUPDRVDEVEXT pDevExt)
721	{
722	return force_async_tsc != 0;
723	}
724
725
726	int VBOXCALL supdrvOSLdrOpen(PSUPDRVDEVEXT pDevExt, PSUPDRVLDRIMAGE pImage, const char *pszFilename)
727	{
728	NOREF(pDevExt); NOREF(pImage); NOREF(pszFilename);
729	return VERR_NOT_SUPPORTED;
730	}
731
732
733	int VBOXCALL supdrvOSLdrValidatePointer(PSUPDRVDEVEXT pDevExt, PSUPDRVLDRIMAGE pImage, void pv, const uint8_t pbImageBits)
734	{
735	NOREF(pDevExt); NOREF(pImage); NOREF(pv); NOREF(pbImageBits);
736	return VERR_NOT_SUPPORTED;
737	}
738
739
740	int VBOXCALL supdrvOSLdrLoad(PSUPDRVDEVEXT pDevExt, PSUPDRVLDRIMAGE pImage, const uint8_t *pbImageBits)
741	{
742	NOREF(pDevExt); NOREF(pImage); NOREF(pbImageBits);
743	return VERR_NOT_SUPPORTED;
744	}
745
746
747	void VBOXCALL supdrvOSLdrUnload(PSUPDRVDEVEXT pDevExt, PSUPDRVLDRIMAGE pImage)
748	{
749	NOREF(pDevExt); NOREF(pImage);
750	}
751
752
753	/**
754	* Converts a supdrv error code to an linux error code.
755	*
756	* @returns corresponding linux error code.
757	* @param rc IPRT status code.
758	*/
759	static int VBoxDrvLinuxErr2LinuxErr(int rc)
760	{
761	switch (rc)
762	{
763	case VINF_SUCCESS: return 0;
764	case VERR_GENERAL_FAILURE: return -EACCES;
765	case VERR_INVALID_PARAMETER: return -EINVAL;
766	case VERR_INVALID_MAGIC: return -EILSEQ;
767	case VERR_INVALID_HANDLE: return -ENXIO;
768	case VERR_INVALID_POINTER: return -EFAULT;
769	case VERR_LOCK_FAILED: return -ENOLCK;
770	case VERR_ALREADY_LOADED: return -EEXIST;
771	case VERR_PERMISSION_DENIED: return -EPERM;
772	case VERR_VERSION_MISMATCH: return -ENOSYS;
773	case VERR_IDT_FAILED: return -1000;
774	}
775
776	return -EPERM;
777	}
778
779
780	RTDECL(int) SUPR0Printf(const char *pszFormat, ...)
781	{
782	#if 1
783	va_list args;
784	char szMsg[512];
785
786	va_start(args, pszFormat);
787	vsnprintf(szMsg, sizeof(szMsg) - 1, pszFormat, args);
788	szMsg[sizeof(szMsg) - 1] = '\0';
789	printk("%s", szMsg);
790	va_end(args);
791	#else
792	/* forward to printf - needs some more GCC hacking to fix ebp... */
793	__asm__ __volatile__ ("mov %0, %esp\n\t"
794	"jmp %1\n\t",
795	:: "r" ((uintptr_t)&pszFormat - 4),
796	"m" (printk));
797	#endif
798	return 0;
799	}
800
801	module_init(VBoxDrvLinuxInit);
802	module_exit(VBoxDrvLinuxUnload);
803
804	MODULE_AUTHOR(VBOX_VENDOR);
805	MODULE_DESCRIPTION(VBOX_PRODUCT " Support Driver");
806	MODULE_LICENSE("GPL");
807	#ifdef MODULE_VERSION
808	MODULE_VERSION(VBOX_VERSION_STRING " (" RT_XSTR(SUPDRV_IOC_VERSION) ")");
809	#endif
810
811	module_param(force_async_tsc, int, 0444);
812	MODULE_PARM_DESC(force_async_tsc, "force the asynchronous TSC mode");
813

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source: vbox/trunk/src/VBox/HostDrivers/Support/linux/SUPDrv-linux.c@ 34856

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