2 * Copyright (c) 2003 Silicon Graphics International Corp.
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30 * $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_backend.c#3 $
33 * CTL backend driver registration routines
35 * Author: Ken Merry <ken@FreeBSD.org>
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/kernel.h>
44 #include <sys/types.h>
45 #include <sys/malloc.h>
47 #include <sys/mutex.h>
48 #include <sys/condvar.h>
49 #include <sys/queue.h>
50 #include <sys/sysctl.h>
52 #include <cam/scsi/scsi_all.h>
53 #include <cam/scsi/scsi_da.h>
54 #include <cam/ctl/ctl_io.h>
55 #include <cam/ctl/ctl.h>
56 #include <cam/ctl/ctl_frontend.h>
57 #include <cam/ctl/ctl_backend.h>
58 #include <cam/ctl/ctl_frontend_internal.h>
59 #include <cam/ctl/ctl_ioctl.h>
60 #include <cam/ctl/ctl_ha.h>
61 #include <cam/ctl/ctl_private.h>
62 #include <cam/ctl/ctl_debug.h>
64 extern struct ctl_softc *control_softc;
65 extern int ctl_disable;
68 ctl_backend_register(struct ctl_backend_driver *be)
70 struct ctl_softc *ctl_softc;
71 struct ctl_backend_driver *be_tmp;
73 ctl_softc = control_softc;
75 /* Don't continue if CTL is disabled */
79 mtx_lock(&ctl_softc->ctl_lock);
81 * Sanity check, make sure this isn't a duplicate registration.
83 STAILQ_FOREACH(be_tmp, &ctl_softc->be_list, links) {
84 if (strcmp(be_tmp->name, be->name) == 0) {
85 mtx_unlock(&ctl_softc->ctl_lock);
89 mtx_unlock(&ctl_softc->ctl_lock);
92 * Call the backend's initialization routine.
96 mtx_lock(&ctl_softc->ctl_lock);
98 STAILQ_INSERT_TAIL(&ctl_softc->be_list, be, links);
100 ctl_softc->num_backends++;
103 * Don't want to increment the usage count for internal consumers,
104 * we won't be able to unload otherwise.
106 /* XXX KDM find a substitute for this? */
108 if ((be->flags & CTL_BE_FLAG_INTERNAL) == 0)
112 #ifdef CS_BE_CONFIG_MOVE_DONE_IS_NOT_USED
113 be->config_move_done = ctl_config_move_done;
115 /* XXX KDM fix this! */
118 atomic_set(&be->num_luns, 0);
121 mtx_unlock(&ctl_softc->ctl_lock);
127 ctl_backend_deregister(struct ctl_backend_driver *be)
129 struct ctl_softc *ctl_softc;
131 ctl_softc = control_softc;
133 mtx_lock(&ctl_softc->ctl_lock);
136 if (atomic_read(&be->num_luns) != 0) {
138 /* XXX KDM fix this! */
139 if (be->num_luns != 0) {
140 mtx_unlock(&ctl_softc->ctl_lock);
144 STAILQ_REMOVE(&ctl_softc->be_list, be, ctl_backend_driver, links);
146 ctl_softc->num_backends--;
148 /* XXX KDM find a substitute for this? */
150 if ((be->flags & CTL_BE_FLAG_INTERNAL) == 0)
154 mtx_unlock(&ctl_softc->ctl_lock);
159 struct ctl_backend_driver *
160 ctl_backend_find(char *backend_name)
162 struct ctl_softc *ctl_softc;
163 struct ctl_backend_driver *be_tmp;
165 ctl_softc = control_softc;
167 mtx_lock(&ctl_softc->ctl_lock);
169 STAILQ_FOREACH(be_tmp, &ctl_softc->be_list, links) {
170 if (strcmp(be_tmp->name, backend_name) == 0) {
171 mtx_unlock(&ctl_softc->ctl_lock);
176 mtx_unlock(&ctl_softc->ctl_lock);