xref: /onnv-gate/usr/src/uts/common/io/drm/drm_auth.c (revision 5804:7af97c792162)
12820Skz151634 /*
2*5804Scg149915  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
32820Skz151634  * Use is subject to license terms.
42820Skz151634  */
52820Skz151634 
62820Skz151634 /*
72820Skz151634  * drm_auth.h -- IOCTLs for authentication -*- linux-c -*-
82820Skz151634  * Created: Tue Feb  2 08:37:54 1999 by faith@valinux.com
92820Skz151634  */
102820Skz151634 /*
112820Skz151634  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
122820Skz151634  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
132820Skz151634  * All Rights Reserved.
142820Skz151634  *
152820Skz151634  * Permission is hereby granted, free of charge, to any person obtaining a
162820Skz151634  * copy of this software and associated documentation files (the "Software"),
172820Skz151634  * to deal in the Software without restriction, including without limitation
182820Skz151634  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
192820Skz151634  * and/or sell copies of the Software, and to permit persons to whom the
202820Skz151634  * Software is furnished to do so, subject to the following conditions:
212820Skz151634  *
222820Skz151634  * The above copyright notice and this permission notice (including the next
232820Skz151634  * paragraph) shall be included in all copies or substantial portions of the
242820Skz151634  * Software.
252820Skz151634  *
262820Skz151634  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
272820Skz151634  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
282820Skz151634  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
292820Skz151634  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
302820Skz151634  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
312820Skz151634  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
322820Skz151634  * OTHER DEALINGS IN THE SOFTWARE.
332820Skz151634  *
342820Skz151634  * Authors:
352820Skz151634  *    Rickard E. (Rik) Faith <faith@valinux.com>
362820Skz151634  *    Gareth Hughes <gareth@valinux.com>
372820Skz151634  *
382820Skz151634  */
392820Skz151634 
402820Skz151634 #pragma ident	"%Z%%M%	%I%	%E% SMI"
412820Skz151634 
422820Skz151634 #include "drmP.h"
432820Skz151634 
442820Skz151634 static int
drm_hash_magic(drm_magic_t magic)452820Skz151634 drm_hash_magic(drm_magic_t magic)
462820Skz151634 {
472820Skz151634 	return (magic & (DRM_HASH_SIZE-1));
482820Skz151634 }
492820Skz151634 
502820Skz151634 drm_file_t *
drm_find_file(drm_device_t * dev,drm_magic_t magic)512820Skz151634 drm_find_file(drm_device_t *dev, drm_magic_t magic)
522820Skz151634 {
532820Skz151634 	drm_file_t	  *retval = NULL;
542820Skz151634 	drm_magic_entry_t *pt;
552820Skz151634 	int		  hash;
562820Skz151634 
572820Skz151634 	hash = drm_hash_magic(magic);
582820Skz151634 	for (pt = dev->magiclist[hash].head; pt; pt = pt->next) {
592820Skz151634 		if (pt->magic == magic) {
602820Skz151634 			retval = pt->priv;
612820Skz151634 			break;
622820Skz151634 		}
632820Skz151634 	}
64*5804Scg149915 
652820Skz151634 	return (retval);
662820Skz151634 }
672820Skz151634 
682820Skz151634 static int
drm_add_magic(drm_device_t * dev,drm_file_t * priv,drm_magic_t magic)692820Skz151634 drm_add_magic(drm_device_t *dev, drm_file_t *priv, drm_magic_t magic)
702820Skz151634 {
712820Skz151634 	int		  hash;
722820Skz151634 	drm_magic_entry_t *entry;
732820Skz151634 
742820Skz151634 	hash = drm_hash_magic(magic);
752820Skz151634 	entry = drm_alloc(sizeof (*entry), DRM_MEM_MAGIC);
762820Skz151634 	if (!entry)
77*5804Scg149915 		return (ENOMEM);
782820Skz151634 	entry->magic = magic;
792820Skz151634 	entry->priv  = priv;
802820Skz151634 	entry->next  = NULL;
812820Skz151634 
822820Skz151634 	DRM_LOCK();
832820Skz151634 	if (dev->magiclist[hash].tail) {
842820Skz151634 		dev->magiclist[hash].tail->next = entry;
852820Skz151634 		dev->magiclist[hash].tail	= entry;
862820Skz151634 	} else {
872820Skz151634 		dev->magiclist[hash].head	= entry;
882820Skz151634 		dev->magiclist[hash].tail	= entry;
892820Skz151634 	}
902820Skz151634 	DRM_UNLOCK();
912820Skz151634 
922820Skz151634 	return (0);
932820Skz151634 }
942820Skz151634 
952820Skz151634 int
drm_remove_magic(drm_device_t * dev,drm_magic_t magic)962820Skz151634 drm_remove_magic(drm_device_t *dev, drm_magic_t magic)
972820Skz151634 {
982820Skz151634 	drm_magic_entry_t *prev = NULL;
992820Skz151634 	drm_magic_entry_t *pt;
1002820Skz151634 	int		  hash;
1012820Skz151634 
1022820Skz151634 	DRM_DEBUG("drm_remove_magic : %d", magic);
1032820Skz151634 	hash = drm_hash_magic(magic);
1042820Skz151634 
1052820Skz151634 	DRM_LOCK();
1062820Skz151634 	for (pt = dev->magiclist[hash].head; pt; prev = pt, pt = pt->next) {
1072820Skz151634 		if (pt->magic == magic) {
1082820Skz151634 			if (dev->magiclist[hash].head == pt) {
1092820Skz151634 				dev->magiclist[hash].head = pt->next;
1102820Skz151634 			}
1112820Skz151634 			if (dev->magiclist[hash].tail == pt) {
1122820Skz151634 				dev->magiclist[hash].tail = prev;
1132820Skz151634 			}
1142820Skz151634 			if (prev) {
1152820Skz151634 				prev->next = pt->next;
1162820Skz151634 			}
1172820Skz151634 			DRM_UNLOCK();
1182820Skz151634 			drm_free(pt, sizeof (*pt), DRM_MEM_MAGIC);
1192820Skz151634 			return (0);
1202820Skz151634 		}
1212820Skz151634 	}
1222820Skz151634 	DRM_UNLOCK();
1232820Skz151634 
124*5804Scg149915 	return (EINVAL);
1252820Skz151634 }
1262820Skz151634 
1272820Skz151634 /*ARGSUSED*/
1282820Skz151634 int
drm_getmagic(DRM_IOCTL_ARGS)1292820Skz151634 drm_getmagic(DRM_IOCTL_ARGS)
1302820Skz151634 {
1312820Skz151634 	DRM_DEVICE;
1322820Skz151634 	static drm_magic_t sequence = 0;
1332820Skz151634 	drm_auth_t auth;
1342820Skz151634 
1352820Skz151634 	/* Find unique magic */
136*5804Scg149915 	if (fpriv->magic) {
137*5804Scg149915 		auth.magic = fpriv->magic;
1382820Skz151634 	} else {
1392820Skz151634 		do {
1402820Skz151634 			int old = sequence;
1412820Skz151634 			auth.magic = old+1;
1422820Skz151634 			if (!atomic_cmpset_int(&sequence, old, auth.magic))
1432820Skz151634 				continue;
1442820Skz151634 		} while (drm_find_file(dev, auth.magic));
145*5804Scg149915 		fpriv->magic = auth.magic;
146*5804Scg149915 		(void) drm_add_magic(dev, fpriv, auth.magic);
1472820Skz151634 	}
1482820Skz151634 
149*5804Scg149915 
1502820Skz151634 	DRM_DEBUG("drm_getmagic: %u", auth.magic);
1512820Skz151634 
152*5804Scg149915 	DRM_COPYTO_WITH_RETURN((void *)data, &auth, sizeof (auth));
1532820Skz151634 
1542820Skz151634 	return (0);
1552820Skz151634 }
1562820Skz151634 
1572820Skz151634 /*ARGSUSED*/
1582820Skz151634 int
drm_authmagic(DRM_IOCTL_ARGS)1592820Skz151634 drm_authmagic(DRM_IOCTL_ARGS)
1602820Skz151634 {
1612820Skz151634 	drm_auth_t	   auth;
1622820Skz151634 	drm_file_t	   *file;
1632820Skz151634 	DRM_DEVICE;
1642820Skz151634 
165*5804Scg149915 	DRM_COPYFROM_WITH_RETURN(&auth, (void *)data, sizeof (auth));
1662820Skz151634 
1672820Skz151634 	if ((file = drm_find_file(dev, auth.magic))) {
1682820Skz151634 		file->authenticated = 1;
1692820Skz151634 		(void) drm_remove_magic(dev, auth.magic);
1702820Skz151634 		return (0);
1712820Skz151634 	}
172*5804Scg149915 	return (EINVAL);
1732820Skz151634 }
174