2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2003 Silicon Graphics International Corp.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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.
32 * $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_backend.c#3 $
35 * CTL backend driver registration routines
37 * Author: Ken Merry <ken@FreeBSD.org>
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD$");
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/kernel.h>
46 #include <sys/types.h>
47 #include <sys/malloc.h>
49 #include <sys/mutex.h>
50 #include <sys/condvar.h>
51 #include <sys/queue.h>
52 #include <sys/sysctl.h>
54 #include <cam/scsi/scsi_all.h>
55 #include <cam/scsi/scsi_da.h>
56 #include <cam/ctl/ctl_io.h>
57 #include <cam/ctl/ctl.h>
58 #include <cam/ctl/ctl_frontend.h>
59 #include <cam/ctl/ctl_backend.h>
60 #include <cam/ctl/ctl_ioctl.h>
61 #include <cam/ctl/ctl_ha.h>
62 #include <cam/ctl/ctl_private.h>
63 #include <cam/ctl/ctl_debug.h>
65 extern struct ctl_softc *control_softc;
68 ctl_backend_register(struct ctl_backend_driver *be)
70 struct ctl_softc *softc = control_softc;
71 struct ctl_backend_driver *be_tmp;
74 /* Sanity check, make sure this isn't a duplicate registration. */
75 mtx_lock(&softc->ctl_lock);
76 STAILQ_FOREACH(be_tmp, &softc->be_list, links) {
77 if (strcmp(be_tmp->name, be->name) == 0) {
78 mtx_unlock(&softc->ctl_lock);
82 mtx_unlock(&softc->ctl_lock);
83 #ifdef CS_BE_CONFIG_MOVE_DONE_IS_NOT_USED
84 be->config_move_done = ctl_config_move_done;
87 /* Call the backend's initialization routine. */
88 if (be->init != NULL) {
89 if ((error = be->init()) != 0) {
90 printf("%s backend init error: %d\n",
96 mtx_lock(&softc->ctl_lock);
97 STAILQ_INSERT_TAIL(&softc->be_list, be, links);
98 softc->num_backends++;
99 mtx_unlock(&softc->ctl_lock);
104 ctl_backend_deregister(struct ctl_backend_driver *be)
106 struct ctl_softc *softc = control_softc;
109 /* Call the backend's shutdown routine. */
110 if (be->shutdown != NULL) {
111 if ((error = be->shutdown()) != 0) {
112 printf("%s backend shutdown error: %d\n",
118 mtx_lock(&softc->ctl_lock);
119 STAILQ_REMOVE(&softc->be_list, be, ctl_backend_driver, links);
120 softc->num_backends--;
121 mtx_unlock(&softc->ctl_lock);
125 struct ctl_backend_driver *
126 ctl_backend_find(char *backend_name)
128 struct ctl_softc *softc = control_softc;
129 struct ctl_backend_driver *be_tmp;
131 mtx_lock(&softc->ctl_lock);
132 STAILQ_FOREACH(be_tmp, &softc->be_list, links) {
133 if (strcmp(be_tmp->name, backend_name) == 0) {
134 mtx_unlock(&softc->ctl_lock);
138 mtx_unlock(&softc->ctl_lock);