1 /*- 2 * Copyright (c) 2005-2008 Daniel Braniss <danny@cs.huji.ac.il> 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 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: src/sys/dev/iscsi/initiator/isc_cam.c,v 1.3 2008/11/25 07:17:11 scottl Exp $ 27 */ 28 29 #include <sys/param.h> 30 #include <sys/kernel.h> 31 #include <sys/callout.h> 32 #include <sys/lock.h> 33 #include <sys/conf.h> 34 #include <sys/systm.h> 35 #include <sys/malloc.h> 36 #include <sys/mbuf.h> 37 #include <sys/uio.h> 38 #include <sys/sysctl.h> 39 #include <sys/eventhandler.h> 40 #include <sys/globaldata.h> 41 42 #include <bus/cam/cam.h> 43 #include <bus/cam/cam_ccb.h> 44 #include <bus/cam/cam_sim.h> 45 #include <bus/cam/cam_xpt.h> 46 #include <bus/cam/cam_xpt_sim.h> 47 #include <bus/cam/cam_xpt_periph.h> 48 #include <bus/cam/cam_periph.h> 49 50 #include <dev/disk/iscsi/initiator/iscsi.h> 51 #include <dev/disk/iscsi/initiator/iscsivar.h> 52 53 // XXX: untested/incomplete 54 void 55 ic_freeze(isc_session_t *sp) 56 { 57 debug_called(8); 58 #if 0 59 sdebug(2, "freezing path=%p", sp->cam_path == NULL? 0: sp->cam_path); 60 if((sp->cam_path != NULL) && !(sp->flags & ISC_FROZEN)) { 61 xpt_freeze_devq(sp->cam_path, 1); 62 } 63 #endif 64 sp->flags |= ISC_FROZEN; 65 } 66 67 // XXX: untested/incomplete 68 void 69 ic_release(isc_session_t *sp) 70 { 71 debug_called(8); 72 #if 0 73 sdebug(2, "release path=%p", sp->cam_path == NULL? 0: sp->cam_path); 74 if((sp->cam_path != NULL) && (sp->flags & ISC_FROZEN)) { 75 xpt_release_devq(sp->cam_path, 1, TRUE); 76 } 77 #endif 78 sp->flags &= ~ISC_FROZEN; 79 } 80 81 void 82 ic_lost_target(isc_session_t *sp, int target) 83 { 84 struct isc_softc *isp = sp->isc; 85 86 debug_called(8); 87 sdebug(2, "target=%d", target); 88 if(sp->cam_path != NULL) { 89 lockmgr(&isp->cam_lock, LK_EXCLUSIVE); 90 xpt_async(AC_LOST_DEVICE, sp->cam_path, NULL); 91 xpt_free_path(sp->cam_path); 92 lockmgr(&isp->cam_lock, LK_RELEASE); 93 sp->cam_path = 0; // XXX 94 } 95 } 96 97 static void 98 _scan_callback(struct cam_periph *periph, union ccb *ccb) 99 { 100 isc_session_t *sp = (isc_session_t *)ccb->ccb_h.spriv_ptr0; 101 102 debug_called(8); 103 104 xpt_free_ccb(&ccb->ccb_h); 105 if (sp->flags & ISC_FFPWAIT) { 106 sp->flags &= ~ISC_FFPWAIT; 107 wakeup(sp); 108 } 109 } 110 111 static void 112 _scan_target(isc_session_t *sp, int target) 113 { 114 union ccb *ccb; 115 116 debug_called(8); 117 sdebug(2, "target=%d", target); 118 119 ccb = xpt_alloc_ccb(); 120 121 CAM_LOCK(sp->isc); 122 xpt_setup_ccb(&ccb->ccb_h, sp->cam_path, 5/*priority (low)*/); 123 ccb->ccb_h.func_code = XPT_SCAN_BUS; 124 ccb->ccb_h.cbfcnp = _scan_callback; 125 ccb->crcn.flags = CAM_FLAG_NONE; 126 ccb->ccb_h.spriv_ptr0 = sp; 127 128 xpt_action(ccb); 129 CAM_UNLOCK(sp->isc); 130 } 131 132 int 133 ic_fullfeature(struct cdev *dev) 134 { 135 struct isc_softc *isp = dev->si_drv1; 136 isc_session_t *sp = (isc_session_t *)dev->si_drv2; 137 138 debug_called(8); 139 sdebug(3, "dev=%d sc=%p", minor(dev), isp); 140 141 sp->flags &= ~ISC_FFPHASE; 142 sp->flags |= ISC_FFPWAIT; 143 144 CAM_LOCK(isp); 145 if(xpt_create_path(&sp->cam_path, xpt_periph, cam_sim_path(sp->isc->cam_sim), 146 sp->sid, CAM_LUN_WILDCARD) != CAM_REQ_CMP) { 147 xdebug("can't create cam path"); 148 CAM_UNLOCK(isp); 149 return ENODEV; // XXX 150 } 151 CAM_UNLOCK(isp); 152 153 _scan_target(sp, sp->sid); 154 155 while(sp->flags & ISC_FFPWAIT) 156 tsleep(sp, 0, "ffp", 5*hz); // timeout should be configurable 157 if(sp->target_nluns > 0) { 158 sp->flags |= ISC_FFPHASE; 159 return 0; 160 } 161 162 return ENODEV; 163 } 164 165 static void 166 _inq(struct cam_sim *sim, union ccb *ccb, int maxluns) 167 { 168 struct ccb_pathinq *cpi = &ccb->cpi; 169 170 debug_called(4); 171 172 cpi->version_num = 1; /* XXX??? */ 173 cpi->hba_inquiry = PI_SDTR_ABLE | PI_TAG_ABLE | PI_WIDE_32; 174 cpi->target_sprt = 0; 175 cpi->hba_misc = 0; 176 cpi->hba_eng_cnt = 0; 177 cpi->max_target = ISCSI_MAX_TARGETS - 1; 178 cpi->initiator_id = ISCSI_MAX_TARGETS; 179 cpi->max_lun = maxluns; 180 cpi->bus_id = cam_sim_bus(sim); 181 cpi->base_transfer_speed = 3300; 182 strncpy(cpi->sim_vid, "DragonFly", SIM_IDLEN); 183 strncpy(cpi->hba_vid, "iSCSI", HBA_IDLEN); 184 strncpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN); 185 cpi->unit_number = cam_sim_unit(sim); 186 cpi->ccb_h.status = CAM_REQ_CMP; 187 } 188 189 static __inline int 190 _scsi_encap(struct cam_sim *sim, union ccb *ccb) 191 { 192 int ret; 193 struct isc_softc *isp = (struct isc_softc *)cam_sim_softc(sim); 194 195 lockmgr(&isp->cam_lock, LK_EXCLUSIVE); 196 ret = scsi_encap(sim, ccb); 197 lockmgr(&isp->cam_lock, LK_RELEASE); 198 return ret; 199 } 200 201 static void 202 ic_action(struct cam_sim *sim, union ccb *ccb) 203 { 204 struct ccb_hdr *ccb_h = &ccb->ccb_h; 205 struct isc_softc *isp = (struct isc_softc *)cam_sim_softc(sim); 206 isc_session_t *sp; 207 208 debug_called(8); 209 210 if((ccb_h->target_id != CAM_TARGET_WILDCARD) && (ccb_h->target_id < MAX_SESSIONS)) 211 sp = isp->sessions[ccb_h->target_id]; 212 else 213 sp = NULL; 214 215 ccb_h->spriv_ptr0 = sp; 216 217 debug(4, "func_code=0x%x flags=0x%x status=0x%x target=%d lun=%d retry_count=%d timeout=%d", 218 ccb_h->func_code, ccb->ccb_h.flags, ccb->ccb_h.status, 219 ccb->ccb_h.target_id, ccb->ccb_h.target_lun, 220 ccb->ccb_h.retry_count, ccb_h->timeout); 221 /* 222 | first quick check 223 */ 224 switch(ccb_h->func_code) { 225 default: 226 // XXX: maybe check something else? 227 break; 228 229 case XPT_SCSI_IO: 230 case XPT_RESET_DEV: 231 case XPT_GET_TRAN_SETTINGS: 232 case XPT_SET_TRAN_SETTINGS: 233 case XPT_CALC_GEOMETRY: 234 if(sp == NULL) { 235 ccb->ccb_h.status = CAM_DEV_NOT_THERE; 236 xpt_done(ccb); 237 return; 238 } 239 break; 240 241 case XPT_PATH_INQ: 242 case XPT_NOOP: 243 if(sp == NULL && ccb->ccb_h.target_id != CAM_TARGET_WILDCARD) { 244 ccb->ccb_h.status = CAM_DEV_NOT_THERE; 245 xpt_done(ccb); 246 debug(4, "status = CAM_DEV_NOT_THERE"); 247 return; 248 } 249 } 250 251 switch(ccb_h->func_code) { 252 253 case XPT_PATH_INQ: 254 _inq(sim, ccb, (sp? sp->opt.maxluns: ISCSI_MAX_LUNS) - 1); 255 break; 256 257 case XPT_RESET_BUS: // (can just be a stub that does nothing and completes) 258 { 259 struct ccb_pathinq *cpi = &ccb->cpi; 260 261 debug(3, "XPT_RESET_BUS"); 262 cpi->ccb_h.status = CAM_REQ_CMP; 263 break; 264 } 265 266 case XPT_SCSI_IO: 267 { 268 struct ccb_scsiio* csio = &ccb->csio; 269 270 debug(4, "XPT_SCSI_IO cmd=0x%x", csio->cdb_io.cdb_bytes[0]); 271 if(sp == NULL) { 272 ccb_h->status = CAM_REQ_INVALID; //CAM_NO_NEXUS; 273 debug(4, "xpt_done.status=%d", ccb_h->status); 274 break; 275 } 276 if(ccb_h->target_lun == CAM_LUN_WILDCARD) { 277 debug(3, "target=%d: bad lun (-1)", ccb_h->target_id); 278 ccb_h->status = CAM_LUN_INVALID; 279 break; 280 } 281 if(_scsi_encap(sim, ccb) != 0) 282 return; 283 break; 284 } 285 286 case XPT_CALC_GEOMETRY: 287 { 288 struct ccb_calc_geometry *ccg; 289 290 ccg = &ccb->ccg; 291 debug(6, "XPT_CALC_GEOMETRY vsize=%jd bsize=%d", ccg->volume_size, ccg->block_size); 292 if(ccg->block_size == 0 || 293 (ccg->volume_size < ccg->block_size)) { 294 // print error message ... 295 /* XXX: what error is appropiate? */ 296 break; 297 } else 298 cam_calc_geometry(ccg, /*extended*/1); 299 break; 300 } 301 302 case XPT_GET_TRAN_SETTINGS: 303 default: 304 ccb_h->status = CAM_REQ_INVALID; 305 break; 306 } 307 xpt_done(ccb); 308 return; 309 } 310 311 static void 312 ic_poll(struct cam_sim *sim) 313 { 314 debug_called(8); 315 316 } 317 318 int 319 ic_getCamVals(isc_session_t *sp, iscsi_cam_t *cp) 320 { 321 int i; 322 323 debug_called(8); 324 325 if(sp && sp->isc->cam_sim) { 326 cp->path_id = cam_sim_path(sp->isc->cam_sim); 327 cp->target_id = sp->sid; 328 cp->target_nluns = sp->target_nluns; // XXX: -1? 329 for(i = 0; i < cp->target_nluns; i++) 330 cp->target_lun[i] = sp->target_lun[i]; 331 return 0; 332 } 333 return ENXIO; 334 } 335 336 void 337 ic_destroy(struct isc_softc *isp) 338 { 339 debug_called(8); 340 341 CAM_LOCK(isp); // can't harm :-) 342 343 xpt_async(AC_LOST_DEVICE, isp->cam_path, NULL); 344 xpt_free_path(isp->cam_path); 345 xpt_bus_deregister(cam_sim_path(isp->cam_sim)); 346 cam_sim_free(isp->cam_sim); 347 348 CAM_UNLOCK(isp); 349 } 350 351 int 352 ic_init(struct isc_softc *isp) 353 { 354 struct cam_sim *sim; 355 struct cam_devq *devq; 356 struct cam_path *path; 357 358 if((devq = cam_simq_alloc(256)) == NULL) 359 return ENOMEM; 360 361 lockinit(&isp->cam_lock, "isc-cam", 0, LK_CANRECURSE); 362 sim = cam_sim_alloc(ic_action, ic_poll, 363 "iscsi", isp, 0, /* unit */ 364 &sim_mplock, 365 1, /* max_dev_transactions */ 366 100, /* max_tagged_dev_transactions */ 367 devq); 368 cam_simq_release(devq); 369 if(sim == NULL) { 370 lockuninit(&isp->cam_lock); 371 return ENXIO; 372 } 373 CAM_LOCK(isp); 374 if(xpt_bus_register(sim, 375 0/*bus_number*/) != CAM_SUCCESS) 376 goto bad; 377 378 if(xpt_create_path(&path, xpt_periph, cam_sim_path(sim), 379 CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP) { 380 xpt_bus_deregister(cam_sim_path(sim)); 381 goto bad; 382 } 383 384 CAM_UNLOCK(isp); 385 386 isp->cam_sim = sim; 387 isp->cam_path = path; 388 389 debug(2, "cam subsystem initialized"); // XXX: add dev ... 390 debug(4, "sim=%p path=%p", sim, path); 391 return 0; 392 393 bad: 394 cam_sim_free(sim); 395 CAM_UNLOCK(isp); 396 return ENXIO; 397 } 398