2 * Copyright (c) 2003 Silicon Graphics International Corp.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions, and the following disclaimer,
10 * without modification.
11 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
12 * substantially similar to the "NO WARRANTY" disclaimer below
13 * ("Disclaimer") and any redistribution must be conditioned upon
14 * including a substantially similar Disclaimer requirement for further
15 * binary redistribution.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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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_ioctl.h>
59 #include <cam/ctl/ctl_ha.h>
60 #include <cam/ctl/ctl_private.h>
61 #include <cam/ctl/ctl_debug.h>
63 extern struct ctl_softc *control_softc;
66 ctl_backend_register(struct ctl_backend_driver *be)
68 struct ctl_softc *softc = control_softc;
69 struct ctl_backend_driver *be_tmp;
71 mtx_lock(&softc->ctl_lock);
73 * Sanity check, make sure this isn't a duplicate registration.
75 STAILQ_FOREACH(be_tmp, &softc->be_list, links) {
76 if (strcmp(be_tmp->name, be->name) == 0) {
77 mtx_unlock(&softc->ctl_lock);
81 mtx_unlock(&softc->ctl_lock);
84 * Call the backend's initialization routine.
88 mtx_lock(&softc->ctl_lock);
90 STAILQ_INSERT_TAIL(&softc->be_list, be, links);
92 softc->num_backends++;
95 * Don't want to increment the usage count for internal consumers,
96 * we won't be able to unload otherwise.
98 /* XXX KDM find a substitute for this? */
100 if ((be->flags & CTL_BE_FLAG_INTERNAL) == 0)
104 #ifdef CS_BE_CONFIG_MOVE_DONE_IS_NOT_USED
105 be->config_move_done = ctl_config_move_done;
107 /* XXX KDM fix this! */
110 atomic_set(&be->num_luns, 0);
113 mtx_unlock(&softc->ctl_lock);
119 ctl_backend_deregister(struct ctl_backend_driver *be)
121 struct ctl_softc *softc = control_softc;
123 mtx_lock(&softc->ctl_lock);
126 if (atomic_read(&be->num_luns) != 0) {
128 /* XXX KDM fix this! */
129 if (be->num_luns != 0) {
130 mtx_unlock(&softc->ctl_lock);
134 STAILQ_REMOVE(&softc->be_list, be, ctl_backend_driver, links);
136 softc->num_backends--;
138 /* XXX KDM find a substitute for this? */
140 if ((be->flags & CTL_BE_FLAG_INTERNAL) == 0)
144 mtx_unlock(&softc->ctl_lock);
149 struct ctl_backend_driver *
150 ctl_backend_find(char *backend_name)
152 struct ctl_softc *softc = control_softc;
153 struct ctl_backend_driver *be_tmp;
155 mtx_lock(&softc->ctl_lock);
156 STAILQ_FOREACH(be_tmp, &softc->be_list, links) {
157 if (strcmp(be_tmp->name, backend_name) == 0) {
158 mtx_unlock(&softc->ctl_lock);
162 mtx_unlock(&softc->ctl_lock);
168 ctl_init_opts(ctl_options_t *opts, int num_args, struct ctl_be_arg *args)
170 struct ctl_option *opt;
174 for (i = 0; i < num_args; i++) {
175 if ((args[i].flags & CTL_BEARG_RD) == 0)
177 if ((args[i].flags & CTL_BEARG_ASCII) == 0)
179 opt = malloc(sizeof(*opt), M_CTL, M_WAITOK);
180 opt->name = strdup(args[i].kname, M_CTL);
181 opt->value = strdup(args[i].kvalue, M_CTL);
182 STAILQ_INSERT_TAIL(opts, opt, links);
187 ctl_update_opts(ctl_options_t *opts, int num_args, struct ctl_be_arg *args)
189 struct ctl_option *opt;
192 for (i = 0; i < num_args; i++) {
193 if ((args[i].flags & CTL_BEARG_RD) == 0)
195 if ((args[i].flags & CTL_BEARG_ASCII) == 0)
197 STAILQ_FOREACH(opt, opts, links) {
198 if (strcmp(opt->name, args[i].kname) == 0)
201 if (args[i].kvalue != NULL &&
202 ((char *)args[i].kvalue)[0] != 0) {
204 free(opt->value, M_CTL);
205 opt->value = strdup(args[i].kvalue, M_CTL);
207 opt = malloc(sizeof(*opt), M_CTL, M_WAITOK);
208 opt->name = strdup(args[i].kname, M_CTL);
209 opt->value = strdup(args[i].kvalue, M_CTL);
210 STAILQ_INSERT_TAIL(opts, opt, links);
213 STAILQ_REMOVE(opts, opt, ctl_option, links);
214 free(opt->name, M_CTL);
215 free(opt->value, M_CTL);
222 ctl_free_opts(ctl_options_t *opts)
224 struct ctl_option *opt;
226 while ((opt = STAILQ_FIRST(opts)) != NULL) {
227 STAILQ_REMOVE_HEAD(opts, links);
228 free(opt->name, M_CTL);
229 free(opt->value, M_CTL);
235 ctl_get_opt(ctl_options_t *opts, const char *name)
237 struct ctl_option *opt;
239 STAILQ_FOREACH(opt, opts, links) {
240 if (strcmp(opt->name, name) == 0) {