1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #include <sys/types.h>
28 #include <sys/door.h>
29 #include <sys/note.h>
30 #include <sys/drctl.h>
31 #include <sys/drctl_impl.h>
32 #include <sys/ddi.h>
33 #include <sys/sunddi.h>
34 #include <sys/dr_util.h>
35
36 static door_handle_t drctl_dh; /* Door for upcalls */
37
38
39 int
i_drctl_ioctl(int cmd,intptr_t arg)40 i_drctl_ioctl(int cmd, intptr_t arg)
41 {
42 int rv;
43 drctl_setup_t setup_rqst;
44
45 switch (cmd) {
46 case DRCTL_IOCTL_CONNECT_SERVER:
47 if (ddi_copyin((caddr_t)arg,
48 &setup_rqst, sizeof (setup_rqst), 0) != 0) {
49 cmn_err(CE_WARN, "i_drctl_ioctl: ddi_copyin failed "
50 "for DRCTL_IOCTL_CONNECT_SERVER");
51 rv = EFAULT;
52 break;
53 }
54
55 drctl_dh = door_ki_lookup(setup_rqst.did);
56 rv = 0;
57 break;
58
59 default:
60 rv = EIO;
61 }
62
63 return (rv);
64 }
65
66 int
i_drctl_send(void * msg,size_t size,void ** obufp,size_t * osize)67 i_drctl_send(void *msg, size_t size, void **obufp, size_t *osize)
68 {
69 int up_err;
70 int rv = 0;
71 door_arg_t door_args;
72 door_handle_t dh = drctl_dh;
73 static const char me[] = "i_drctl_send";
74
75 retry:
76 if (dh)
77 door_ki_hold(dh);
78 else
79 return (EIO);
80
81 door_args.data_ptr = (char *)msg;
82 door_args.data_size = size;
83 door_args.desc_ptr = NULL;
84 door_args.desc_num = 0;
85
86 /*
87 * We don't know the size of the message the daemon
88 * will pass back to us. By setting rbuf to NULL,
89 * we force the door code to allocate a buf of the
90 * appropriate size. We must set rsize > 0, however,
91 * else the door code acts as if no response was
92 * expected and doesn't pass the data to us.
93 */
94 door_args.rbuf = NULL;
95 door_args.rsize = 1;
96 DR_DBG_CTL("%s: msg %p size %ld obufp %p osize %p\n",
97 me, msg, size, (void *)obufp, (void *)osize);
98
99 up_err = door_ki_upcall_limited(dh, &door_args, NULL, SIZE_MAX, 0);
100 if (up_err == 0) {
101 if (door_args.rbuf == NULL)
102 goto done;
103
104 DR_DBG_CTL("%s: rbuf %p rsize %ld\n", me,
105 (void *)door_args.rbuf, door_args.rsize);
106
107 if (obufp != NULL) {
108 *obufp = door_args.rbuf;
109 *osize = door_args.rsize;
110 DR_DBG_KMEM("%s: (door) alloc addr %p size %ld\n",
111 __func__,
112 (void *)(door_args.rbuf), door_args.rsize);
113 } else {
114 /*
115 * No output buffer pointer was passed in,
116 * so the response buffer allocated by the
117 * door code must be deallocated.
118 */
119 DR_DBG_KMEM("%s: free addr %p size %ld\n", __func__,
120 (void *)(door_args.rbuf), door_args.rsize);
121 kmem_free(door_args.rbuf, door_args.rsize);
122 }
123 } else {
124 switch (up_err) {
125 case EINTR:
126 DR_DBG_CTL("%s: door call returned EINTR\n", me);
127 /* FALLTHROUGH */
128 case EAGAIN:
129 /*
130 * Server process may be forking, try again.
131 */
132 door_ki_rele(dh);
133 delay(hz);
134 goto retry;
135 case EBADF:
136 case EINVAL:
137 drctl_dh = NULL;
138 DR_DBG_CTL(
139 "%s: door call failed with %d\n", me, up_err);
140 rv = EIO;
141 break;
142 default:
143 DR_DBG_CTL("%s: unexpected return "
144 "code %d from door_ki_upcall\n", me, up_err);
145 rv = EIO;
146 break;
147 }
148 }
149
150 done:
151 door_ki_rele(dh);
152 return (rv);
153 }
154