1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2003 Silicon Graphics International Corp.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions, and the following disclaimer,
12 * without modification.
13 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
14 * substantially similar to the "NO WARRANTY" disclaimer below
15 * ("Disclaimer") and any redistribution must be conditioned upon
16 * including a substantially similar Disclaimer requirement for further
17 * binary redistribution.
18 *
19 * NO WARRANTY
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
28 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
29 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGES.
31 *
32 * $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_backend.c#3 $
33 */
34 /*
35 * CTL backend driver registration routines
36 *
37 * Author: Ken Merry <ken@FreeBSD.org>
38 */
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/kernel.h>
43 #include <sys/types.h>
44 #include <sys/malloc.h>
45 #include <sys/lock.h>
46 #include <sys/mutex.h>
47 #include <sys/condvar.h>
48 #include <sys/queue.h>
49 #include <sys/sysctl.h>
50
51 #include <cam/scsi/scsi_all.h>
52 #include <cam/scsi/scsi_da.h>
53 #include <cam/ctl/ctl_io.h>
54 #include <cam/ctl/ctl.h>
55 #include <cam/ctl/ctl_frontend.h>
56 #include <cam/ctl/ctl_backend.h>
57 #include <cam/ctl/ctl_ioctl.h>
58 #include <cam/ctl/ctl_ha.h>
59 #include <cam/ctl/ctl_private.h>
60 #include <cam/ctl/ctl_debug.h>
61
62 int
ctl_backend_register(struct ctl_backend_driver * be)63 ctl_backend_register(struct ctl_backend_driver *be)
64 {
65 struct ctl_softc *softc = control_softc;
66 struct ctl_backend_driver *be_tmp;
67 int error;
68
69 /* Sanity check, make sure this isn't a duplicate registration. */
70 mtx_lock(&softc->ctl_lock);
71 STAILQ_FOREACH(be_tmp, &softc->be_list, links) {
72 if (strcmp(be_tmp->name, be->name) == 0) {
73 mtx_unlock(&softc->ctl_lock);
74 return (-1);
75 }
76 }
77 mtx_unlock(&softc->ctl_lock);
78 #ifdef CS_BE_CONFIG_MOVE_DONE_IS_NOT_USED
79 be->config_move_done = ctl_config_move_done;
80 #endif
81
82 /* Call the backend's initialization routine. */
83 if (be->init != NULL) {
84 if ((error = be->init()) != 0) {
85 printf("%s backend init error: %d\n",
86 be->name, error);
87 return (error);
88 }
89 }
90
91 mtx_lock(&softc->ctl_lock);
92 STAILQ_INSERT_TAIL(&softc->be_list, be, links);
93 softc->num_backends++;
94 mtx_unlock(&softc->ctl_lock);
95 return (0);
96 }
97
98 int
ctl_backend_deregister(struct ctl_backend_driver * be)99 ctl_backend_deregister(struct ctl_backend_driver *be)
100 {
101 struct ctl_softc *softc = control_softc;
102 int error;
103
104 /* Call the backend's shutdown routine. */
105 if (be->shutdown != NULL) {
106 if ((error = be->shutdown()) != 0) {
107 printf("%s backend shutdown error: %d\n",
108 be->name, error);
109 return (error);
110 }
111 }
112
113 mtx_lock(&softc->ctl_lock);
114 STAILQ_REMOVE(&softc->be_list, be, ctl_backend_driver, links);
115 softc->num_backends--;
116 mtx_unlock(&softc->ctl_lock);
117 return (0);
118 }
119
120 struct ctl_backend_driver *
ctl_backend_find(char * backend_name)121 ctl_backend_find(char *backend_name)
122 {
123 struct ctl_softc *softc = control_softc;
124 struct ctl_backend_driver *be_tmp;
125
126 mtx_lock(&softc->ctl_lock);
127 STAILQ_FOREACH(be_tmp, &softc->be_list, links) {
128 if (strcmp(be_tmp->name, backend_name) == 0) {
129 mtx_unlock(&softc->ctl_lock);
130 return (be_tmp);
131 }
132 }
133 mtx_unlock(&softc->ctl_lock);
134
135 return (NULL);
136 }
137