1 /*- 2 * Copyright (c) 2003 Silicon Graphics International Corp. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 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. 16 * 17 * NO WARRANTY 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 26 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 27 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGES. 29 * 30 * $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_backend.c#3 $ 31 */ 32 /* 33 * CTL backend driver registration routines 34 * 35 * Author: Ken Merry <ken@FreeBSD.org> 36 */ 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 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> 46 #include <sys/lock.h> 47 #include <sys/mutex.h> 48 #include <sys/condvar.h> 49 #include <sys/queue.h> 50 #include <sys/sysctl.h> 51 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> 62 63 extern struct ctl_softc *control_softc; 64 65 int 66 ctl_backend_register(struct ctl_backend_driver *be) 67 { 68 struct ctl_softc *softc = control_softc; 69 struct ctl_backend_driver *be_tmp; 70 int error; 71 72 /* Sanity check, make sure this isn't a duplicate registration. */ 73 mtx_lock(&softc->ctl_lock); 74 STAILQ_FOREACH(be_tmp, &softc->be_list, links) { 75 if (strcmp(be_tmp->name, be->name) == 0) { 76 mtx_unlock(&softc->ctl_lock); 77 return (-1); 78 } 79 } 80 mtx_unlock(&softc->ctl_lock); 81 #ifdef CS_BE_CONFIG_MOVE_DONE_IS_NOT_USED 82 be->config_move_done = ctl_config_move_done; 83 #endif 84 be->num_luns = 0; 85 86 /* Call the backend's initialization routine. */ 87 if (be->init != NULL) { 88 if ((error = be->init()) != 0) { 89 printf("%s backend init error: %d\n", 90 be->name, error); 91 return (error); 92 } 93 } 94 95 mtx_lock(&softc->ctl_lock); 96 STAILQ_INSERT_TAIL(&softc->be_list, be, links); 97 softc->num_backends++; 98 mtx_unlock(&softc->ctl_lock); 99 return (0); 100 } 101 102 int 103 ctl_backend_deregister(struct ctl_backend_driver *be) 104 { 105 struct ctl_softc *softc = control_softc; 106 int error; 107 108 /* Call the backend's shutdown routine. */ 109 if (be->shutdown != NULL) { 110 if ((error = be->shutdown()) != 0) { 111 printf("%s backend shutdown error: %d\n", 112 be->name, error); 113 return (error); 114 } 115 } 116 117 mtx_lock(&softc->ctl_lock); 118 STAILQ_REMOVE(&softc->be_list, be, ctl_backend_driver, links); 119 softc->num_backends--; 120 mtx_unlock(&softc->ctl_lock); 121 return (0); 122 } 123 124 struct ctl_backend_driver * 125 ctl_backend_find(char *backend_name) 126 { 127 struct ctl_softc *softc = control_softc; 128 struct ctl_backend_driver *be_tmp; 129 130 mtx_lock(&softc->ctl_lock); 131 STAILQ_FOREACH(be_tmp, &softc->be_list, links) { 132 if (strcmp(be_tmp->name, backend_name) == 0) { 133 mtx_unlock(&softc->ctl_lock); 134 return (be_tmp); 135 } 136 } 137 mtx_unlock(&softc->ctl_lock); 138 139 return (NULL); 140 } 141 142 void 143 ctl_init_opts(ctl_options_t *opts, int num_args, struct ctl_be_arg *args) 144 { 145 struct ctl_option *opt; 146 int i; 147 148 STAILQ_INIT(opts); 149 for (i = 0; i < num_args; i++) { 150 if ((args[i].flags & CTL_BEARG_RD) == 0) 151 continue; 152 if ((args[i].flags & CTL_BEARG_ASCII) == 0) 153 continue; 154 opt = malloc(sizeof(*opt), M_CTL, M_WAITOK); 155 opt->name = strdup(args[i].kname, M_CTL); 156 opt->value = strdup(args[i].kvalue, M_CTL); 157 STAILQ_INSERT_TAIL(opts, opt, links); 158 } 159 } 160 161 void 162 ctl_update_opts(ctl_options_t *opts, int num_args, struct ctl_be_arg *args) 163 { 164 struct ctl_option *opt; 165 int i; 166 167 for (i = 0; i < num_args; i++) { 168 if ((args[i].flags & CTL_BEARG_RD) == 0) 169 continue; 170 if ((args[i].flags & CTL_BEARG_ASCII) == 0) 171 continue; 172 STAILQ_FOREACH(opt, opts, links) { 173 if (strcmp(opt->name, args[i].kname) == 0) 174 break; 175 } 176 if (args[i].kvalue != NULL && 177 ((char *)args[i].kvalue)[0] != 0) { 178 if (opt) { 179 free(opt->value, M_CTL); 180 opt->value = strdup(args[i].kvalue, M_CTL); 181 } else { 182 opt = malloc(sizeof(*opt), M_CTL, M_WAITOK); 183 opt->name = strdup(args[i].kname, M_CTL); 184 opt->value = strdup(args[i].kvalue, M_CTL); 185 STAILQ_INSERT_TAIL(opts, opt, links); 186 } 187 } else if (opt) { 188 STAILQ_REMOVE(opts, opt, ctl_option, links); 189 free(opt->name, M_CTL); 190 free(opt->value, M_CTL); 191 free(opt, M_CTL); 192 } 193 } 194 } 195 196 void 197 ctl_free_opts(ctl_options_t *opts) 198 { 199 struct ctl_option *opt; 200 201 while ((opt = STAILQ_FIRST(opts)) != NULL) { 202 STAILQ_REMOVE_HEAD(opts, links); 203 free(opt->name, M_CTL); 204 free(opt->value, M_CTL); 205 free(opt, M_CTL); 206 } 207 } 208 209 char * 210 ctl_get_opt(ctl_options_t *opts, const char *name) 211 { 212 struct ctl_option *opt; 213 214 STAILQ_FOREACH(opt, opts, links) { 215 if (strcmp(opt->name, name) == 0) { 216 return (opt->value); 217 } 218 } 219 return (NULL); 220 } 221 222 int 223 ctl_get_opt_number(ctl_options_t *opts, const char *name, uint64_t *val) 224 { 225 const char *value; 226 227 value = ctl_get_opt(opts, name); 228 if (value == NULL) 229 return (-2); 230 return (ctl_expand_number(value, val)); 231 } 232