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 #include <sys/mutex2.h> 42 43 #include <bus/cam/cam.h> 44 #include <bus/cam/cam_ccb.h> 45 #include <bus/cam/cam_sim.h> 46 #include <bus/cam/cam_xpt_sim.h> 47 #include <bus/cam/cam_periph.h> 48 49 #include <dev/disk/iscsi/initiator/iscsi.h> 50 #include <dev/disk/iscsi/initiator/iscsivar.h> 51 52 // XXX: untested/incomplete 53 void 54 ic_freeze(isc_session_t *sp) 55 { 56 debug_called(8); 57 #if 0 58 sdebug(2, "freezing path=%p", sp->cam_path == NULL? 0: sp->cam_path); 59 if((sp->cam_path != NULL) && !(sp->flags & ISC_FROZEN)) { 60 xpt_freeze_devq(sp->cam_path, 1); 61 } 62 #endif 63 sp->flags |= ISC_FROZEN; 64 } 65 66 // XXX: untested/incomplete 67 void 68 ic_release(isc_session_t *sp) 69 { 70 debug_called(8); 71 #if 0 72 sdebug(2, "release path=%p", sp->cam_path == NULL? 0: sp->cam_path); 73 if((sp->cam_path != NULL) && (sp->flags & ISC_FROZEN)) { 74 xpt_release_devq(sp->cam_path, 1, TRUE); 75 } 76 #endif 77 sp->flags &= ~ISC_FROZEN; 78 } 79 80 void 81 ic_lost_target(isc_session_t *sp, int target) 82 { 83 struct isc_softc *isp = sp->isc; 84 85 debug_called(8); 86 sdebug(2, "target=%d", target); 87 if(sp->cam_path != NULL) { 88 lockmgr(&isp->cam_lock, LK_EXCLUSIVE); 89 xpt_async(AC_LOST_DEVICE, sp->cam_path, NULL); 90 xpt_free_path(sp->cam_path); 91 lockmgr(&isp->cam_lock, LK_RELEASE); 92 sp->cam_path = 0; // XXX 93 } 94 } 95 96 static void 97 _scan_callback(struct cam_periph *periph, union ccb *ccb) 98 { 99 isc_session_t *sp = (isc_session_t *)ccb->ccb_h.spriv_ptr0; 100 101 debug_called(8); 102 103 kfree(ccb, M_TEMP); 104 105 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 if((ccb = kmalloc(sizeof(union ccb), M_TEMP, M_WAITOK | M_ZERO)) == NULL) { 120 xdebug("scan failed (can't allocate CCB)"); 121 return; 122 } 123 CAM_LOCK(sp->isc); 124 xpt_setup_ccb(&ccb->ccb_h, sp->cam_path, 5/*priority (low)*/); 125 ccb->ccb_h.func_code = XPT_SCAN_BUS; 126 ccb->ccb_h.cbfcnp = _scan_callback; 127 ccb->crcn.flags = CAM_FLAG_NONE; 128 ccb->ccb_h.spriv_ptr0 = sp; 129 130 xpt_action(ccb); 131 CAM_UNLOCK(sp->isc); 132 } 133 134 int 135 ic_fullfeature(struct cdev *dev) 136 { 137 struct isc_softc *isp = dev->si_drv1; 138 isc_session_t *sp = (isc_session_t *)dev->si_drv2; 139 140 debug_called(8); 141 sdebug(3, "dev=%d sc=%p", minor(dev), isp); 142 143 sp->flags &= ~ISC_FFPHASE; 144 sp->flags |= ISC_FFPWAIT; 145 146 CAM_LOCK(isp); 147 if(xpt_create_path(&sp->cam_path, xpt_periph, cam_sim_path(sp->isc->cam_sim), 148 sp->sid, CAM_LUN_WILDCARD) != CAM_REQ_CMP) { 149 xdebug("can't create cam path"); 150 CAM_UNLOCK(isp); 151 return ENODEV; // XXX 152 } 153 CAM_UNLOCK(isp); 154 155 _scan_target(sp, sp->sid); 156 157 while(sp->flags & ISC_FFPWAIT) 158 tsleep(sp, 0, "ffp", 5*hz); // timeout should be configurable 159 if(sp->target_nluns > 0) { 160 sp->flags |= ISC_FFPHASE; 161 return 0; 162 } 163 164 return ENODEV; 165 } 166 167 static void 168 _inq(struct cam_sim *sim, union ccb *ccb, int maxluns) 169 { 170 struct ccb_pathinq *cpi = &ccb->cpi; 171 172 debug_called(4); 173 174 cpi->version_num = 1; /* XXX??? */ 175 cpi->hba_inquiry = PI_SDTR_ABLE | PI_TAG_ABLE | PI_WIDE_32; 176 cpi->target_sprt = 0; 177 cpi->hba_misc = 0; 178 cpi->hba_eng_cnt = 0; 179 cpi->max_target = ISCSI_MAX_TARGETS - 1; 180 cpi->initiator_id = ISCSI_MAX_TARGETS; 181 cpi->max_lun = maxluns; 182 cpi->bus_id = cam_sim_bus(sim); 183 cpi->base_transfer_speed = 3300; 184 strncpy(cpi->sim_vid, "DragonFly", SIM_IDLEN); 185 strncpy(cpi->hba_vid, "iSCSI", HBA_IDLEN); 186 strncpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN); 187 cpi->unit_number = cam_sim_unit(sim); 188 cpi->ccb_h.status = CAM_REQ_CMP; 189 } 190 191 static __inline int 192 _scsi_encap(struct cam_sim *sim, union ccb *ccb) 193 { 194 int ret; 195 struct isc_softc *isp = (struct isc_softc *)cam_sim_softc(sim); 196 197 lockmgr(&isp->cam_lock, LK_EXCLUSIVE); 198 ret = scsi_encap(sim, ccb); 199 lockmgr(&isp->cam_lock, LK_RELEASE); 200 return ret; 201 } 202 203 static void 204 ic_action(struct cam_sim *sim, union ccb *ccb) 205 { 206 struct ccb_hdr *ccb_h = &ccb->ccb_h; 207 struct isc_softc *isp = (struct isc_softc *)cam_sim_softc(sim); 208 isc_session_t *sp; 209 210 debug_called(8); 211 212 if((ccb_h->target_id != CAM_TARGET_WILDCARD) && (ccb_h->target_id < MAX_SESSIONS)) 213 sp = isp->sessions[ccb_h->target_id]; 214 else 215 sp = NULL; 216 217 ccb_h->spriv_ptr0 = sp; 218 219 debug(4, "func_code=0x%x flags=0x%x status=0x%x target=%d lun=%d retry_count=%d timeout=%d", 220 ccb_h->func_code, ccb->ccb_h.flags, ccb->ccb_h.status, 221 ccb->ccb_h.target_id, ccb->ccb_h.target_lun, 222 ccb->ccb_h.retry_count, ccb_h->timeout); 223 /* 224 | first quick check 225 */ 226 switch(ccb_h->func_code) { 227 default: 228 // XXX: maybe check something else? 229 break; 230 231 case XPT_SCSI_IO: 232 case XPT_RESET_DEV: 233 case XPT_GET_TRAN_SETTINGS: 234 case XPT_SET_TRAN_SETTINGS: 235 case XPT_CALC_GEOMETRY: 236 if(sp == NULL) { 237 ccb->ccb_h.status = CAM_DEV_NOT_THERE; 238 xpt_done(ccb); 239 return; 240 } 241 break; 242 243 case XPT_PATH_INQ: 244 case XPT_NOOP: 245 if(sp == NULL && ccb->ccb_h.target_id != CAM_TARGET_WILDCARD) { 246 ccb->ccb_h.status = CAM_DEV_NOT_THERE; 247 xpt_done(ccb); 248 debug(4, "status = CAM_DEV_NOT_THERE"); 249 return; 250 } 251 } 252 253 switch(ccb_h->func_code) { 254 255 case XPT_PATH_INQ: 256 _inq(sim, ccb, (sp? sp->opt.maxluns: ISCSI_MAX_LUNS) - 1); 257 break; 258 259 case XPT_RESET_BUS: // (can just be a stub that does nothing and completes) 260 { 261 struct ccb_pathinq *cpi = &ccb->cpi; 262 263 debug(3, "XPT_RESET_BUS"); 264 cpi->ccb_h.status = CAM_REQ_CMP; 265 break; 266 } 267 268 case XPT_SCSI_IO: 269 { 270 struct ccb_scsiio* csio = &ccb->csio; 271 272 debug(4, "XPT_SCSI_IO cmd=0x%x", csio->cdb_io.cdb_bytes[0]); 273 if(sp == NULL) { 274 ccb_h->status = CAM_REQ_INVALID; //CAM_NO_NEXUS; 275 debug(4, "xpt_done.status=%d", ccb_h->status); 276 break; 277 } 278 if(ccb_h->target_lun == CAM_LUN_WILDCARD) { 279 debug(3, "target=%d: bad lun (-1)", ccb_h->target_id); 280 ccb_h->status = CAM_LUN_INVALID; 281 break; 282 } 283 if(_scsi_encap(sim, ccb) != 0) 284 return; 285 break; 286 } 287 288 case XPT_CALC_GEOMETRY: 289 { 290 struct ccb_calc_geometry *ccg; 291 292 ccg = &ccb->ccg; 293 debug(6, "XPT_CALC_GEOMETRY vsize=%jd bsize=%d", ccg->volume_size, ccg->block_size); 294 if(ccg->block_size == 0 || 295 (ccg->volume_size < ccg->block_size)) { 296 // print error message ... 297 /* XXX: what error is appropiate? */ 298 break; 299 } else 300 cam_calc_geometry(ccg, /*extended*/1); 301 break; 302 } 303 304 case XPT_GET_TRAN_SETTINGS: 305 default: 306 ccb_h->status = CAM_REQ_INVALID; 307 break; 308 } 309 xpt_done(ccb); 310 return; 311 } 312 313 static void 314 ic_poll(struct cam_sim *sim) 315 { 316 debug_called(8); 317 318 } 319 320 int 321 ic_getCamVals(isc_session_t *sp, iscsi_cam_t *cp) 322 { 323 int i; 324 325 debug_called(8); 326 327 if(sp && sp->isc->cam_sim) { 328 cp->path_id = cam_sim_path(sp->isc->cam_sim); 329 cp->target_id = sp->sid; 330 cp->target_nluns = sp->target_nluns; // XXX: -1? 331 for(i = 0; i < cp->target_nluns; i++) 332 cp->target_lun[i] = sp->target_lun[i]; 333 return 0; 334 } 335 return ENXIO; 336 } 337 338 void 339 ic_destroy(struct isc_softc *isp) 340 { 341 debug_called(8); 342 343 CAM_LOCK(isp); // can't harm :-) 344 345 xpt_async(AC_LOST_DEVICE, isp->cam_path, NULL); 346 xpt_free_path(isp->cam_path); 347 xpt_bus_deregister(cam_sim_path(isp->cam_sim)); 348 cam_sim_free(isp->cam_sim); 349 350 CAM_UNLOCK(isp); 351 } 352 353 int 354 ic_init(struct isc_softc *isp) 355 { 356 struct cam_sim *sim; 357 struct cam_devq *devq; 358 struct cam_path *path; 359 360 if((devq = cam_simq_alloc(256)) == NULL) 361 return ENOMEM; 362 363 lockinit(&isp->cam_lock, "isc-cam", 0, LK_CANRECURSE); 364 sim = cam_sim_alloc(ic_action, ic_poll, 365 "iscsi", isp, 0, /* unit */ 366 &sim_mplock, 367 1, /* max_dev_transactions */ 368 100, /* max_tagged_dev_transactions */ 369 devq); 370 cam_simq_release(devq); 371 if(sim == NULL) { 372 lockuninit(&isp->cam_lock); 373 return ENXIO; 374 } 375 CAM_LOCK(isp); 376 if(xpt_bus_register(sim, 377 0/*bus_number*/) != CAM_SUCCESS) 378 goto bad; 379 380 if(xpt_create_path(&path, xpt_periph, cam_sim_path(sim), 381 CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP) { 382 xpt_bus_deregister(cam_sim_path(sim)); 383 goto bad; 384 } 385 386 CAM_UNLOCK(isp); 387 388 isp->cam_sim = sim; 389 isp->cam_path = path; 390 391 debug(2, "cam subsystem initialized"); // XXX: add dev ... 392 debug(4, "sim=%p path=%p", sim, path); 393 return 0; 394 395 bad: 396 cam_sim_free(sim); 397 CAM_UNLOCK(isp); 398 return ENXIO; 399 } 400