1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 27 /* 28 * MT STREAMS Virtual Console Redirection Device Driver 29 */ 30 31 #include <sys/types.h> 32 #include <sys/param.h> 33 #include <sys/errno.h> 34 #include <sys/kmem.h> 35 #include <sys/stat.h> 36 #include <sys/stream.h> 37 #include <sys/stropts.h> 38 #include <sys/strsun.h> 39 #include <sys/debug.h> 40 #include <sys/thread.h> 41 #include <sys/conf.h> 42 #include <sys/ddi.h> 43 #include <sys/sunddi.h> 44 #include <sys/tty.h> 45 #include <sys/sc_cvcio.h> 46 #include <sys/conf.h> 47 #include <sys/modctl.h> 48 49 50 /* 51 * Routine to to register/unregister our queue for console output and pass 52 * redirected data to the console. The cvc driver will do a putnext using 53 * our queue, so we will not see the redirected console data. 54 */ 55 extern int cvc_redir(mblk_t *); 56 extern int cvc_register(queue_t *); 57 extern int cvc_unregister(queue_t *); 58 59 static int cvcr_info(dev_info_t *, ddi_info_cmd_t, void *, void **); 60 static int cvcr_attach(dev_info_t *, ddi_attach_cmd_t); 61 static int cvcr_detach(dev_info_t *, ddi_detach_cmd_t); 62 static int cvcr_wput(queue_t *, mblk_t *); 63 static int cvcr_open(queue_t *, dev_t *, int, int, cred_t *); 64 static int cvcr_close(queue_t *, int, cred_t *); 65 static void cvcr_ioctl(queue_t *, mblk_t *); 66 67 static dev_info_t *cvcr_dip; 68 static int cvcr_suspend = 0; 69 70 static struct module_info minfo = { 71 1314, /* mi_idnum Bad luck number +1 ;-) */ 72 "cvcredir", /* mi_idname */ 73 0, /* mi_minpsz */ 74 INFPSZ, /* mi_maxpsz */ 75 2048, /* mi_hiwat */ 76 2048 /* mi_lowat */ 77 }; 78 79 static struct qinit cvcr_rinit = { 80 NULL, /* qi_putp */ 81 NULL, /* qi_srvp */ 82 cvcr_open, /* qi_qopen */ 83 cvcr_close, /* qi_qclose */ 84 NULL, /* qi_qadmin */ 85 &minfo, /* qi_minfo */ 86 NULL /* qi_mstat */ 87 }; 88 89 static struct qinit cvcr_winit = { 90 cvcr_wput, /* qi_putp */ 91 NULL, /* qi_srvp */ 92 cvcr_open, /* qi_qopen */ 93 cvcr_close, /* qi_qclose */ 94 NULL, /* qi_qadmin */ 95 &minfo, /* qi_minfo */ 96 NULL /* qi_mstat */ 97 }; 98 99 struct streamtab cvcrinfo = { 100 &cvcr_rinit, /* st_rdinit */ 101 &cvcr_winit, /* st_wrinit */ 102 NULL, /* st_muxrinit */ 103 NULL /* st_muxwrinit */ 104 }; 105 106 DDI_DEFINE_STREAM_OPS(cvcrops, nulldev, nulldev, cvcr_attach, 107 cvcr_detach, nodev, cvcr_info, (D_MTPERQ|D_MP), &cvcrinfo, 108 ddi_quiesce_not_supported); 109 110 extern struct mod_ops mod_driverops; 111 112 static struct modldrv modldrv = { 113 &mod_driverops, /* Type of module. This one is a pseudo driver */ 114 "CVC redirect driver 'cvcredir'", 115 &cvcrops, /* driver ops */ 116 }; 117 118 static struct modlinkage modlinkage = { 119 MODREV_1, 120 &modldrv, 121 NULL 122 }; 123 124 125 int 126 _init() 127 { 128 return (mod_install(&modlinkage)); 129 } 130 131 int 132 _fini() 133 { 134 return (mod_remove(&modlinkage)); 135 } 136 137 int 138 _info(modinfop) 139 struct modinfo *modinfop; 140 { 141 return (mod_info(&modlinkage, modinfop)); 142 } 143 144 /*ARGSUSED*/ 145 static int 146 cvcr_attach(dev_info_t *devi, ddi_attach_cmd_t cmd) 147 { 148 if (cmd == DDI_RESUME) { 149 if (cvcr_suspend) { 150 cvcr_suspend = 0; 151 } 152 } else { 153 if (ddi_create_minor_node(devi, "cvcredir", S_IFCHR, 154 0, NULL, NULL) == DDI_FAILURE) { 155 ddi_remove_minor_node(devi, NULL); 156 return (-1); 157 } 158 cvcr_dip = devi; 159 } 160 return (DDI_SUCCESS); 161 } 162 163 static int 164 cvcr_detach(dev_info_t *dip, ddi_detach_cmd_t cmd) 165 { 166 if (cmd == DDI_SUSPEND) { 167 if (!cvcr_suspend) { 168 cvcr_suspend = 1; 169 } 170 } else { 171 if (cmd != DDI_DETACH) { 172 return (DDI_FAILURE); 173 } 174 ddi_remove_minor_node(dip, NULL); 175 } 176 return (DDI_SUCCESS); 177 } 178 179 /* ARGSUSED */ 180 static int 181 cvcr_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result) 182 { 183 register int error; 184 185 switch (infocmd) { 186 case DDI_INFO_DEVT2DEVINFO: 187 if (cvcr_dip == NULL) { 188 error = DDI_FAILURE; 189 } else { 190 *result = (void *)cvcr_dip; 191 error = DDI_SUCCESS; 192 } 193 break; 194 case DDI_INFO_DEVT2INSTANCE: 195 *result = (void *)0; 196 error = DDI_SUCCESS; 197 break; 198 default: 199 error = DDI_FAILURE; 200 } 201 return (error); 202 } 203 204 /* ARGSUSED */ 205 static int 206 cvcr_open(queue_t *q, dev_t *dev, int flag, int sflag, cred_t *cred) 207 { 208 WR(q)->q_ptr = q->q_ptr = (char *)2; 209 /* 210 * call into the cvc driver to register our queue. cvc will use 211 * our queue to send console output data upstream (our stream)to 212 * cvcd which has us open and is reading console data. 213 */ 214 if (cvc_register(RD(q)) == -1) { 215 cmn_err(CE_WARN, "cvcr_open: cvc_register failed for q = 0x%p", 216 q); 217 } 218 return (0); 219 } 220 221 /* ARGSUSED */ 222 static int 223 cvcr_close(queue_t *q, int flag, cred_t *cred) 224 { 225 /* 226 * call into the cvc driver to un-register our queue. cvc will 227 * no longer use our queue to send console output data upstream. 228 */ 229 cvc_unregister(RD(q)); 230 WR(q)->q_ptr = q->q_ptr = NULL; 231 return (0); 232 } 233 234 static int 235 cvcr_wput(queue_t *q, mblk_t *mp) 236 { 237 /* 238 * Handle network-transmitted control messages 239 */ 240 if (mp->b_datap->db_type == M_IOCTL) { 241 cvcr_ioctl(q, mp); 242 return (0); 243 } 244 /* 245 * Call into the cvc driver to put console input data on 246 * its upstream queue to be picked up by the console driver. 247 */ 248 if (!cvc_redir(mp)) 249 freemsg(mp); 250 return (0); 251 } 252 253 static void 254 cvcr_ioctl(queue_t *q, mblk_t *mp) 255 { 256 struct iocblk *iocp = (struct iocblk *)mp->b_rptr; 257 258 /* 259 * If this is a CVC_BREAK, drop to OBP/kmdb from here rather than 260 * passing the mblk on to cvc. If it is a disconnect, pass it on to 261 * cvc. Nothing else is currently supported, so NAK all others. 262 * Note that cvc_redir doesn't free the mblk passed in, so we can 263 * reuse it for ACKing. 264 */ 265 if (iocp->ioc_cmd == CVC_BREAK) { 266 abort_sequence_enter((char *)NULL); 267 miocack(q, mp, 0, 0); 268 } else if (iocp->ioc_cmd == CVC_DISCONNECT) { 269 (void) cvc_redir(mp); 270 miocack(q, mp, 0, 0); 271 } else { 272 miocnak(q, mp, 0, EINVAL); 273 } 274 } 275