1 /******************************************************************************* 2 * Filename: target_core_pscsi.c 3 * 4 * This file contains the generic target mode <-> Linux SCSI subsystem plugin. 5 * 6 * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc. 7 * Copyright (c) 2005, 2006, 2007 SBE, Inc. 8 * Copyright (c) 2007-2010 Rising Tide Systems 9 * Copyright (c) 2008-2010 Linux-iSCSI.org 10 * 11 * Nicholas A. Bellinger <nab@kernel.org> 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License as published by 15 * the Free Software Foundation; either version 2 of the License, or 16 * (at your option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software 25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 26 * 27 ******************************************************************************/ 28 29 #include <linux/version.h> 30 #include <linux/string.h> 31 #include <linux/parser.h> 32 #include <linux/timer.h> 33 #include <linux/blkdev.h> 34 #include <linux/blk_types.h> 35 #include <linux/slab.h> 36 #include <linux/spinlock.h> 37 #include <linux/genhd.h> 38 #include <linux/cdrom.h> 39 #include <linux/file.h> 40 #include <scsi/scsi.h> 41 #include <scsi/scsi_device.h> 42 #include <scsi/scsi_cmnd.h> 43 #include <scsi/scsi_host.h> 44 #include <scsi/libsas.h> /* For TASK_ATTR_* */ 45 46 #include <target/target_core_base.h> 47 #include <target/target_core_device.h> 48 #include <target/target_core_transport.h> 49 50 #include "target_core_pscsi.h" 51 52 #define ISPRINT(a) ((a >= ' ') && (a <= '~')) 53 54 static struct se_subsystem_api pscsi_template; 55 56 static void pscsi_req_done(struct request *, int); 57 58 /* pscsi_get_sh(): 59 * 60 * 61 */ 62 static struct Scsi_Host *pscsi_get_sh(u32 host_no) 63 { 64 struct Scsi_Host *sh = NULL; 65 66 sh = scsi_host_lookup(host_no); 67 if (IS_ERR(sh)) { 68 printk(KERN_ERR "Unable to locate SCSI HBA with Host ID:" 69 " %u\n", host_no); 70 return NULL; 71 } 72 73 return sh; 74 } 75 76 /* pscsi_attach_hba(): 77 * 78 * pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host. 79 * from the passed SCSI Host ID. 80 */ 81 static int pscsi_attach_hba(struct se_hba *hba, u32 host_id) 82 { 83 int hba_depth; 84 struct pscsi_hba_virt *phv; 85 86 phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL); 87 if (!(phv)) { 88 printk(KERN_ERR "Unable to allocate struct pscsi_hba_virt\n"); 89 return -1; 90 } 91 phv->phv_host_id = host_id; 92 phv->phv_mode = PHV_VIRUTAL_HOST_ID; 93 hba_depth = PSCSI_VIRTUAL_HBA_DEPTH; 94 atomic_set(&hba->left_queue_depth, hba_depth); 95 atomic_set(&hba->max_queue_depth, hba_depth); 96 97 hba->hba_ptr = (void *)phv; 98 99 printk(KERN_INFO "CORE_HBA[%d] - TCM SCSI HBA Driver %s on" 100 " Generic Target Core Stack %s\n", hba->hba_id, 101 PSCSI_VERSION, TARGET_CORE_MOD_VERSION); 102 printk(KERN_INFO "CORE_HBA[%d] - Attached SCSI HBA to Generic" 103 " Target Core with TCQ Depth: %d\n", hba->hba_id, 104 atomic_read(&hba->max_queue_depth)); 105 106 return 0; 107 } 108 109 static void pscsi_detach_hba(struct se_hba *hba) 110 { 111 struct pscsi_hba_virt *phv = hba->hba_ptr; 112 struct Scsi_Host *scsi_host = phv->phv_lld_host; 113 114 if (scsi_host) { 115 scsi_host_put(scsi_host); 116 117 printk(KERN_INFO "CORE_HBA[%d] - Detached SCSI HBA: %s from" 118 " Generic Target Core\n", hba->hba_id, 119 (scsi_host->hostt->name) ? (scsi_host->hostt->name) : 120 "Unknown"); 121 } else 122 printk(KERN_INFO "CORE_HBA[%d] - Detached Virtual SCSI HBA" 123 " from Generic Target Core\n", hba->hba_id); 124 125 kfree(phv); 126 hba->hba_ptr = NULL; 127 } 128 129 static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag) 130 { 131 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr; 132 struct Scsi_Host *sh = phv->phv_lld_host; 133 int hba_depth = PSCSI_VIRTUAL_HBA_DEPTH; 134 /* 135 * Release the struct Scsi_Host 136 */ 137 if (!(mode_flag)) { 138 if (!(sh)) 139 return 0; 140 141 phv->phv_lld_host = NULL; 142 phv->phv_mode = PHV_VIRUTAL_HOST_ID; 143 atomic_set(&hba->left_queue_depth, hba_depth); 144 atomic_set(&hba->max_queue_depth, hba_depth); 145 146 printk(KERN_INFO "CORE_HBA[%d] - Disabled pSCSI HBA Passthrough" 147 " %s\n", hba->hba_id, (sh->hostt->name) ? 148 (sh->hostt->name) : "Unknown"); 149 150 scsi_host_put(sh); 151 return 0; 152 } 153 /* 154 * Otherwise, locate struct Scsi_Host from the original passed 155 * pSCSI Host ID and enable for phba mode 156 */ 157 sh = pscsi_get_sh(phv->phv_host_id); 158 if (!(sh)) { 159 printk(KERN_ERR "pSCSI: Unable to locate SCSI Host for" 160 " phv_host_id: %d\n", phv->phv_host_id); 161 return -1; 162 } 163 /* 164 * Usually the SCSI LLD will use the hostt->can_queue value to define 165 * its HBA TCQ depth. Some other drivers (like 2.6 megaraid) don't set 166 * this at all and set sh->can_queue at runtime. 167 */ 168 hba_depth = (sh->hostt->can_queue > sh->can_queue) ? 169 sh->hostt->can_queue : sh->can_queue; 170 171 atomic_set(&hba->left_queue_depth, hba_depth); 172 atomic_set(&hba->max_queue_depth, hba_depth); 173 174 phv->phv_lld_host = sh; 175 phv->phv_mode = PHV_LLD_SCSI_HOST_NO; 176 177 printk(KERN_INFO "CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n", 178 hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown"); 179 180 return 1; 181 } 182 183 static void pscsi_tape_read_blocksize(struct se_device *dev, 184 struct scsi_device *sdev) 185 { 186 unsigned char cdb[MAX_COMMAND_SIZE], *buf; 187 int ret; 188 189 buf = kzalloc(12, GFP_KERNEL); 190 if (!buf) 191 return; 192 193 memset(cdb, 0, MAX_COMMAND_SIZE); 194 cdb[0] = MODE_SENSE; 195 cdb[4] = 0x0c; /* 12 bytes */ 196 197 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL, 198 HZ, 1, NULL); 199 if (ret) 200 goto out_free; 201 202 /* 203 * If MODE_SENSE still returns zero, set the default value to 1024. 204 */ 205 sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]); 206 if (!sdev->sector_size) 207 sdev->sector_size = 1024; 208 out_free: 209 kfree(buf); 210 } 211 212 static void 213 pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn) 214 { 215 unsigned char *buf; 216 217 if (sdev->inquiry_len < INQUIRY_LEN) 218 return; 219 220 buf = sdev->inquiry; 221 if (!buf) 222 return; 223 /* 224 * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev() 225 */ 226 memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor)); 227 memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model)); 228 memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision)); 229 } 230 231 static int 232 pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn) 233 { 234 unsigned char cdb[MAX_COMMAND_SIZE], *buf; 235 int ret; 236 237 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL); 238 if (!buf) 239 return -1; 240 241 memset(cdb, 0, MAX_COMMAND_SIZE); 242 cdb[0] = INQUIRY; 243 cdb[1] = 0x01; /* Query VPD */ 244 cdb[2] = 0x80; /* Unit Serial Number */ 245 cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff; 246 cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff); 247 248 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 249 INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL); 250 if (ret) 251 goto out_free; 252 253 snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]); 254 255 wwn->t10_sub_dev->su_dev_flags |= SDF_FIRMWARE_VPD_UNIT_SERIAL; 256 257 kfree(buf); 258 return 0; 259 260 out_free: 261 kfree(buf); 262 return -1; 263 } 264 265 static void 266 pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev, 267 struct t10_wwn *wwn) 268 { 269 unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83; 270 int ident_len, page_len, off = 4, ret; 271 struct t10_vpd *vpd; 272 273 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL); 274 if (!buf) 275 return; 276 277 memset(cdb, 0, MAX_COMMAND_SIZE); 278 cdb[0] = INQUIRY; 279 cdb[1] = 0x01; /* Query VPD */ 280 cdb[2] = 0x83; /* Device Identifier */ 281 cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff; 282 cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff); 283 284 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 285 INQUIRY_VPD_DEVICE_IDENTIFIER_LEN, 286 NULL, HZ, 1, NULL); 287 if (ret) 288 goto out; 289 290 page_len = (buf[2] << 8) | buf[3]; 291 while (page_len > 0) { 292 /* Grab a pointer to the Identification descriptor */ 293 page_83 = &buf[off]; 294 ident_len = page_83[3]; 295 if (!ident_len) { 296 printk(KERN_ERR "page_83[3]: identifier" 297 " length zero!\n"); 298 break; 299 } 300 printk(KERN_INFO "T10 VPD Identifer Length: %d\n", ident_len); 301 302 vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL); 303 if (!vpd) { 304 printk(KERN_ERR "Unable to allocate memory for" 305 " struct t10_vpd\n"); 306 goto out; 307 } 308 INIT_LIST_HEAD(&vpd->vpd_list); 309 310 transport_set_vpd_proto_id(vpd, page_83); 311 transport_set_vpd_assoc(vpd, page_83); 312 313 if (transport_set_vpd_ident_type(vpd, page_83) < 0) { 314 off += (ident_len + 4); 315 page_len -= (ident_len + 4); 316 kfree(vpd); 317 continue; 318 } 319 if (transport_set_vpd_ident(vpd, page_83) < 0) { 320 off += (ident_len + 4); 321 page_len -= (ident_len + 4); 322 kfree(vpd); 323 continue; 324 } 325 326 list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list); 327 off += (ident_len + 4); 328 page_len -= (ident_len + 4); 329 } 330 331 out: 332 kfree(buf); 333 } 334 335 /* pscsi_add_device_to_list(): 336 * 337 * 338 */ 339 static struct se_device *pscsi_add_device_to_list( 340 struct se_hba *hba, 341 struct se_subsystem_dev *se_dev, 342 struct pscsi_dev_virt *pdv, 343 struct scsi_device *sd, 344 int dev_flags) 345 { 346 struct se_device *dev; 347 struct se_dev_limits dev_limits; 348 struct request_queue *q; 349 struct queue_limits *limits; 350 351 memset(&dev_limits, 0, sizeof(struct se_dev_limits)); 352 353 if (!sd->queue_depth) { 354 sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH; 355 356 printk(KERN_ERR "Set broken SCSI Device %d:%d:%d" 357 " queue_depth to %d\n", sd->channel, sd->id, 358 sd->lun, sd->queue_depth); 359 } 360 /* 361 * Setup the local scope queue_limits from struct request_queue->limits 362 * to pass into transport_add_device_to_core_hba() as struct se_dev_limits. 363 */ 364 q = sd->request_queue; 365 limits = &dev_limits.limits; 366 limits->logical_block_size = sd->sector_size; 367 limits->max_hw_sectors = (sd->host->max_sectors > queue_max_hw_sectors(q)) ? 368 queue_max_hw_sectors(q) : sd->host->max_sectors; 369 limits->max_sectors = (sd->host->max_sectors > queue_max_sectors(q)) ? 370 queue_max_sectors(q) : sd->host->max_sectors; 371 dev_limits.hw_queue_depth = sd->queue_depth; 372 dev_limits.queue_depth = sd->queue_depth; 373 /* 374 * Setup our standard INQUIRY info into se_dev->t10_wwn 375 */ 376 pscsi_set_inquiry_info(sd, &se_dev->t10_wwn); 377 378 /* 379 * Set the pointer pdv->pdv_sd to from passed struct scsi_device, 380 * which has already been referenced with Linux SCSI code with 381 * scsi_device_get() in this file's pscsi_create_virtdevice(). 382 * 383 * The passthrough operations called by the transport_add_device_* 384 * function below will require this pointer to be set for passthroug 385 * ops. 386 * 387 * For the shutdown case in pscsi_free_device(), this struct 388 * scsi_device reference is released with Linux SCSI code 389 * scsi_device_put() and the pdv->pdv_sd cleared. 390 */ 391 pdv->pdv_sd = sd; 392 393 dev = transport_add_device_to_core_hba(hba, &pscsi_template, 394 se_dev, dev_flags, (void *)pdv, 395 &dev_limits, NULL, NULL); 396 if (!(dev)) { 397 pdv->pdv_sd = NULL; 398 return NULL; 399 } 400 401 /* 402 * Locate VPD WWN Information used for various purposes within 403 * the Storage Engine. 404 */ 405 if (!pscsi_get_inquiry_vpd_serial(sd, &se_dev->t10_wwn)) { 406 /* 407 * If VPD Unit Serial returned GOOD status, try 408 * VPD Device Identification page (0x83). 409 */ 410 pscsi_get_inquiry_vpd_device_ident(sd, &se_dev->t10_wwn); 411 } 412 413 /* 414 * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE. 415 */ 416 if (sd->type == TYPE_TAPE) 417 pscsi_tape_read_blocksize(dev, sd); 418 return dev; 419 } 420 421 static void *pscsi_allocate_virtdevice(struct se_hba *hba, const char *name) 422 { 423 struct pscsi_dev_virt *pdv; 424 425 pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL); 426 if (!(pdv)) { 427 printk(KERN_ERR "Unable to allocate memory for struct pscsi_dev_virt\n"); 428 return NULL; 429 } 430 pdv->pdv_se_hba = hba; 431 432 printk(KERN_INFO "PSCSI: Allocated pdv: %p for %s\n", pdv, name); 433 return (void *)pdv; 434 } 435 436 /* 437 * Called with struct Scsi_Host->host_lock called. 438 */ 439 static struct se_device *pscsi_create_type_disk( 440 struct scsi_device *sd, 441 struct pscsi_dev_virt *pdv, 442 struct se_subsystem_dev *se_dev, 443 struct se_hba *hba) 444 __releases(sh->host_lock) 445 { 446 struct se_device *dev; 447 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr; 448 struct Scsi_Host *sh = sd->host; 449 struct block_device *bd; 450 u32 dev_flags = 0; 451 452 if (scsi_device_get(sd)) { 453 printk(KERN_ERR "scsi_device_get() failed for %d:%d:%d:%d\n", 454 sh->host_no, sd->channel, sd->id, sd->lun); 455 spin_unlock_irq(sh->host_lock); 456 return NULL; 457 } 458 spin_unlock_irq(sh->host_lock); 459 /* 460 * Claim exclusive struct block_device access to struct scsi_device 461 * for TYPE_DISK using supplied udev_path 462 */ 463 bd = blkdev_get_by_path(se_dev->se_dev_udev_path, 464 FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv); 465 if (IS_ERR(bd)) { 466 printk(KERN_ERR "pSCSI: blkdev_get_by_path() failed\n"); 467 scsi_device_put(sd); 468 return NULL; 469 } 470 pdv->pdv_bd = bd; 471 472 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags); 473 if (!(dev)) { 474 blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); 475 scsi_device_put(sd); 476 return NULL; 477 } 478 printk(KERN_INFO "CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%d\n", 479 phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun); 480 481 return dev; 482 } 483 484 /* 485 * Called with struct Scsi_Host->host_lock called. 486 */ 487 static struct se_device *pscsi_create_type_rom( 488 struct scsi_device *sd, 489 struct pscsi_dev_virt *pdv, 490 struct se_subsystem_dev *se_dev, 491 struct se_hba *hba) 492 __releases(sh->host_lock) 493 { 494 struct se_device *dev; 495 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr; 496 struct Scsi_Host *sh = sd->host; 497 u32 dev_flags = 0; 498 499 if (scsi_device_get(sd)) { 500 printk(KERN_ERR "scsi_device_get() failed for %d:%d:%d:%d\n", 501 sh->host_no, sd->channel, sd->id, sd->lun); 502 spin_unlock_irq(sh->host_lock); 503 return NULL; 504 } 505 spin_unlock_irq(sh->host_lock); 506 507 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags); 508 if (!(dev)) { 509 scsi_device_put(sd); 510 return NULL; 511 } 512 printk(KERN_INFO "CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n", 513 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no, 514 sd->channel, sd->id, sd->lun); 515 516 return dev; 517 } 518 519 /* 520 *Called with struct Scsi_Host->host_lock called. 521 */ 522 static struct se_device *pscsi_create_type_other( 523 struct scsi_device *sd, 524 struct pscsi_dev_virt *pdv, 525 struct se_subsystem_dev *se_dev, 526 struct se_hba *hba) 527 __releases(sh->host_lock) 528 { 529 struct se_device *dev; 530 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr; 531 struct Scsi_Host *sh = sd->host; 532 u32 dev_flags = 0; 533 534 spin_unlock_irq(sh->host_lock); 535 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags); 536 if (!(dev)) 537 return NULL; 538 539 printk(KERN_INFO "CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n", 540 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no, 541 sd->channel, sd->id, sd->lun); 542 543 return dev; 544 } 545 546 static struct se_device *pscsi_create_virtdevice( 547 struct se_hba *hba, 548 struct se_subsystem_dev *se_dev, 549 void *p) 550 { 551 struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *)p; 552 struct se_device *dev; 553 struct scsi_device *sd; 554 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr; 555 struct Scsi_Host *sh = phv->phv_lld_host; 556 int legacy_mode_enable = 0; 557 558 if (!(pdv)) { 559 printk(KERN_ERR "Unable to locate struct pscsi_dev_virt" 560 " parameter\n"); 561 return ERR_PTR(-EINVAL); 562 } 563 /* 564 * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the 565 * struct Scsi_Host we will need to bring the TCM/pSCSI object online 566 */ 567 if (!(sh)) { 568 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) { 569 printk(KERN_ERR "pSCSI: Unable to locate struct" 570 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n"); 571 return ERR_PTR(-ENODEV); 572 } 573 /* 574 * For the newer PHV_VIRUTAL_HOST_ID struct scsi_device 575 * reference, we enforce that udev_path has been set 576 */ 577 if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH)) { 578 printk(KERN_ERR "pSCSI: udev_path attribute has not" 579 " been set before ENABLE=1\n"); 580 return ERR_PTR(-EINVAL); 581 } 582 /* 583 * If no scsi_host_id= was passed for PHV_VIRUTAL_HOST_ID, 584 * use the original TCM hba ID to reference Linux/SCSI Host No 585 * and enable for PHV_LLD_SCSI_HOST_NO mode. 586 */ 587 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) { 588 spin_lock(&hba->device_lock); 589 if (!(list_empty(&hba->hba_dev_list))) { 590 printk(KERN_ERR "pSCSI: Unable to set hba_mode" 591 " with active devices\n"); 592 spin_unlock(&hba->device_lock); 593 return ERR_PTR(-EEXIST); 594 } 595 spin_unlock(&hba->device_lock); 596 597 if (pscsi_pmode_enable_hba(hba, 1) != 1) 598 return ERR_PTR(-ENODEV); 599 600 legacy_mode_enable = 1; 601 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE; 602 sh = phv->phv_lld_host; 603 } else { 604 sh = pscsi_get_sh(pdv->pdv_host_id); 605 if (!(sh)) { 606 printk(KERN_ERR "pSCSI: Unable to locate" 607 " pdv_host_id: %d\n", pdv->pdv_host_id); 608 return ERR_PTR(-ENODEV); 609 } 610 } 611 } else { 612 if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) { 613 printk(KERN_ERR "pSCSI: PHV_VIRUTAL_HOST_ID set while" 614 " struct Scsi_Host exists\n"); 615 return ERR_PTR(-EEXIST); 616 } 617 } 618 619 spin_lock_irq(sh->host_lock); 620 list_for_each_entry(sd, &sh->__devices, siblings) { 621 if ((pdv->pdv_channel_id != sd->channel) || 622 (pdv->pdv_target_id != sd->id) || 623 (pdv->pdv_lun_id != sd->lun)) 624 continue; 625 /* 626 * Functions will release the held struct scsi_host->host_lock 627 * before calling calling pscsi_add_device_to_list() to register 628 * struct scsi_device with target_core_mod. 629 */ 630 switch (sd->type) { 631 case TYPE_DISK: 632 dev = pscsi_create_type_disk(sd, pdv, se_dev, hba); 633 break; 634 case TYPE_ROM: 635 dev = pscsi_create_type_rom(sd, pdv, se_dev, hba); 636 break; 637 default: 638 dev = pscsi_create_type_other(sd, pdv, se_dev, hba); 639 break; 640 } 641 642 if (!(dev)) { 643 if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) 644 scsi_host_put(sh); 645 else if (legacy_mode_enable) { 646 pscsi_pmode_enable_hba(hba, 0); 647 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE; 648 } 649 pdv->pdv_sd = NULL; 650 return ERR_PTR(-ENODEV); 651 } 652 return dev; 653 } 654 spin_unlock_irq(sh->host_lock); 655 656 printk(KERN_ERR "pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no, 657 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id); 658 659 if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) 660 scsi_host_put(sh); 661 else if (legacy_mode_enable) { 662 pscsi_pmode_enable_hba(hba, 0); 663 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE; 664 } 665 666 return ERR_PTR(-ENODEV); 667 } 668 669 /* pscsi_free_device(): (Part of se_subsystem_api_t template) 670 * 671 * 672 */ 673 static void pscsi_free_device(void *p) 674 { 675 struct pscsi_dev_virt *pdv = p; 676 struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr; 677 struct scsi_device *sd = pdv->pdv_sd; 678 679 if (sd) { 680 /* 681 * Release exclusive pSCSI internal struct block_device claim for 682 * struct scsi_device with TYPE_DISK from pscsi_create_type_disk() 683 */ 684 if ((sd->type == TYPE_DISK) && pdv->pdv_bd) { 685 blkdev_put(pdv->pdv_bd, 686 FMODE_WRITE|FMODE_READ|FMODE_EXCL); 687 pdv->pdv_bd = NULL; 688 } 689 /* 690 * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference 691 * to struct Scsi_Host now. 692 */ 693 if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) && 694 (phv->phv_lld_host != NULL)) 695 scsi_host_put(phv->phv_lld_host); 696 697 if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM)) 698 scsi_device_put(sd); 699 700 pdv->pdv_sd = NULL; 701 } 702 703 kfree(pdv); 704 } 705 706 static inline struct pscsi_plugin_task *PSCSI_TASK(struct se_task *task) 707 { 708 return container_of(task, struct pscsi_plugin_task, pscsi_task); 709 } 710 711 712 /* pscsi_transport_complete(): 713 * 714 * 715 */ 716 static int pscsi_transport_complete(struct se_task *task) 717 { 718 struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr; 719 struct scsi_device *sd = pdv->pdv_sd; 720 int result; 721 struct pscsi_plugin_task *pt = PSCSI_TASK(task); 722 unsigned char *cdb = &pt->pscsi_cdb[0]; 723 724 result = pt->pscsi_result; 725 /* 726 * Hack to make sure that Write-Protect modepage is set if R/O mode is 727 * forced. 728 */ 729 if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) && 730 (status_byte(result) << 1) == SAM_STAT_GOOD) { 731 if (!TASK_CMD(task)->se_deve) 732 goto after_mode_sense; 733 734 if (TASK_CMD(task)->se_deve->lun_flags & 735 TRANSPORT_LUNFLAGS_READ_ONLY) { 736 unsigned char *buf = (unsigned char *) 737 T_TASK(task->task_se_cmd)->t_task_buf; 738 739 if (cdb[0] == MODE_SENSE_10) { 740 if (!(buf[3] & 0x80)) 741 buf[3] |= 0x80; 742 } else { 743 if (!(buf[2] & 0x80)) 744 buf[2] |= 0x80; 745 } 746 } 747 } 748 after_mode_sense: 749 750 if (sd->type != TYPE_TAPE) 751 goto after_mode_select; 752 753 /* 754 * Hack to correctly obtain the initiator requested blocksize for 755 * TYPE_TAPE. Since this value is dependent upon each tape media, 756 * struct scsi_device->sector_size will not contain the correct value 757 * by default, so we go ahead and set it so 758 * TRANSPORT(dev)->get_blockdev() returns the correct value to the 759 * storage engine. 760 */ 761 if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) && 762 (status_byte(result) << 1) == SAM_STAT_GOOD) { 763 unsigned char *buf; 764 struct scatterlist *sg = task->task_sg; 765 u16 bdl; 766 u32 blocksize; 767 768 buf = sg_virt(&sg[0]); 769 if (!(buf)) { 770 printk(KERN_ERR "Unable to get buf for scatterlist\n"); 771 goto after_mode_select; 772 } 773 774 if (cdb[0] == MODE_SELECT) 775 bdl = (buf[3]); 776 else 777 bdl = (buf[6] << 8) | (buf[7]); 778 779 if (!bdl) 780 goto after_mode_select; 781 782 if (cdb[0] == MODE_SELECT) 783 blocksize = (buf[9] << 16) | (buf[10] << 8) | 784 (buf[11]); 785 else 786 blocksize = (buf[13] << 16) | (buf[14] << 8) | 787 (buf[15]); 788 789 sd->sector_size = blocksize; 790 } 791 after_mode_select: 792 793 if (status_byte(result) & CHECK_CONDITION) 794 return 1; 795 796 return 0; 797 } 798 799 static struct se_task * 800 pscsi_alloc_task(struct se_cmd *cmd) 801 { 802 struct pscsi_plugin_task *pt; 803 unsigned char *cdb = T_TASK(cmd)->t_task_cdb; 804 805 pt = kzalloc(sizeof(struct pscsi_plugin_task), GFP_KERNEL); 806 if (!pt) { 807 printk(KERN_ERR "Unable to allocate struct pscsi_plugin_task\n"); 808 return NULL; 809 } 810 811 /* 812 * If TCM Core is signaling a > TCM_MAX_COMMAND_SIZE allocation, 813 * allocate the extended CDB buffer for per struct se_task context 814 * pt->pscsi_cdb now. 815 */ 816 if (T_TASK(cmd)->t_task_cdb != T_TASK(cmd)->__t_task_cdb) { 817 818 pt->pscsi_cdb = kzalloc(scsi_command_size(cdb), GFP_KERNEL); 819 if (!(pt->pscsi_cdb)) { 820 printk(KERN_ERR "pSCSI: Unable to allocate extended" 821 " pt->pscsi_cdb\n"); 822 kfree(pt); 823 return NULL; 824 } 825 } else 826 pt->pscsi_cdb = &pt->__pscsi_cdb[0]; 827 828 return &pt->pscsi_task; 829 } 830 831 static inline void pscsi_blk_init_request( 832 struct se_task *task, 833 struct pscsi_plugin_task *pt, 834 struct request *req, 835 int bidi_read) 836 { 837 /* 838 * Defined as "scsi command" in include/linux/blkdev.h. 839 */ 840 req->cmd_type = REQ_TYPE_BLOCK_PC; 841 /* 842 * For the extra BIDI-COMMAND READ struct request we do not 843 * need to setup the remaining structure members 844 */ 845 if (bidi_read) 846 return; 847 /* 848 * Setup the done function pointer for struct request, 849 * also set the end_io_data pointer.to struct se_task. 850 */ 851 req->end_io = pscsi_req_done; 852 req->end_io_data = (void *)task; 853 /* 854 * Load the referenced struct se_task's SCSI CDB into 855 * include/linux/blkdev.h:struct request->cmd 856 */ 857 req->cmd_len = scsi_command_size(pt->pscsi_cdb); 858 req->cmd = &pt->pscsi_cdb[0]; 859 /* 860 * Setup pointer for outgoing sense data. 861 */ 862 req->sense = (void *)&pt->pscsi_sense[0]; 863 req->sense_len = 0; 864 } 865 866 /* 867 * Used for pSCSI data payloads for all *NON* SCF_SCSI_DATA_SG_IO_CDB 868 */ 869 static int pscsi_blk_get_request(struct se_task *task) 870 { 871 struct pscsi_plugin_task *pt = PSCSI_TASK(task); 872 struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr; 873 874 pt->pscsi_req = blk_get_request(pdv->pdv_sd->request_queue, 875 (task->task_data_direction == DMA_TO_DEVICE), 876 GFP_KERNEL); 877 if (!(pt->pscsi_req) || IS_ERR(pt->pscsi_req)) { 878 printk(KERN_ERR "PSCSI: blk_get_request() failed: %ld\n", 879 IS_ERR(pt->pscsi_req)); 880 return PYX_TRANSPORT_LU_COMM_FAILURE; 881 } 882 /* 883 * Setup the newly allocated struct request for REQ_TYPE_BLOCK_PC, 884 * and setup rq callback, CDB and sense. 885 */ 886 pscsi_blk_init_request(task, pt, pt->pscsi_req, 0); 887 return 0; 888 } 889 890 /* pscsi_do_task(): (Part of se_subsystem_api_t template) 891 * 892 * 893 */ 894 static int pscsi_do_task(struct se_task *task) 895 { 896 struct pscsi_plugin_task *pt = PSCSI_TASK(task); 897 struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr; 898 /* 899 * Set the struct request->timeout value based on peripheral 900 * device type from SCSI. 901 */ 902 if (pdv->pdv_sd->type == TYPE_DISK) 903 pt->pscsi_req->timeout = PS_TIMEOUT_DISK; 904 else 905 pt->pscsi_req->timeout = PS_TIMEOUT_OTHER; 906 907 pt->pscsi_req->retries = PS_RETRY; 908 /* 909 * Queue the struct request into the struct scsi_device->request_queue. 910 * Also check for HEAD_OF_QUEUE SAM TASK attr from received se_cmd 911 * descriptor 912 */ 913 blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, pt->pscsi_req, 914 (task->task_se_cmd->sam_task_attr == TASK_ATTR_HOQ), 915 pscsi_req_done); 916 917 return PYX_TRANSPORT_SENT_TO_TRANSPORT; 918 } 919 920 static void pscsi_free_task(struct se_task *task) 921 { 922 struct pscsi_plugin_task *pt = PSCSI_TASK(task); 923 struct se_cmd *cmd = task->task_se_cmd; 924 925 /* 926 * Release the extended CDB allocation from pscsi_alloc_task() 927 * if one exists. 928 */ 929 if (T_TASK(cmd)->t_task_cdb != T_TASK(cmd)->__t_task_cdb) 930 kfree(pt->pscsi_cdb); 931 /* 932 * We do not release the bio(s) here associated with this task, as 933 * this is handled by bio_put() and pscsi_bi_endio(). 934 */ 935 kfree(pt); 936 } 937 938 enum { 939 Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id, 940 Opt_scsi_lun_id, Opt_err 941 }; 942 943 static match_table_t tokens = { 944 {Opt_scsi_host_id, "scsi_host_id=%d"}, 945 {Opt_scsi_channel_id, "scsi_channel_id=%d"}, 946 {Opt_scsi_target_id, "scsi_target_id=%d"}, 947 {Opt_scsi_lun_id, "scsi_lun_id=%d"}, 948 {Opt_err, NULL} 949 }; 950 951 static ssize_t pscsi_set_configfs_dev_params(struct se_hba *hba, 952 struct se_subsystem_dev *se_dev, 953 const char *page, 954 ssize_t count) 955 { 956 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr; 957 struct pscsi_hba_virt *phv = hba->hba_ptr; 958 char *orig, *ptr, *opts; 959 substring_t args[MAX_OPT_ARGS]; 960 int ret = 0, arg, token; 961 962 opts = kstrdup(page, GFP_KERNEL); 963 if (!opts) 964 return -ENOMEM; 965 966 orig = opts; 967 968 while ((ptr = strsep(&opts, ",")) != NULL) { 969 if (!*ptr) 970 continue; 971 972 token = match_token(ptr, tokens, args); 973 switch (token) { 974 case Opt_scsi_host_id: 975 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) { 976 printk(KERN_ERR "PSCSI[%d]: Unable to accept" 977 " scsi_host_id while phv_mode ==" 978 " PHV_LLD_SCSI_HOST_NO\n", 979 phv->phv_host_id); 980 ret = -EINVAL; 981 goto out; 982 } 983 match_int(args, &arg); 984 pdv->pdv_host_id = arg; 985 printk(KERN_INFO "PSCSI[%d]: Referencing SCSI Host ID:" 986 " %d\n", phv->phv_host_id, pdv->pdv_host_id); 987 pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID; 988 break; 989 case Opt_scsi_channel_id: 990 match_int(args, &arg); 991 pdv->pdv_channel_id = arg; 992 printk(KERN_INFO "PSCSI[%d]: Referencing SCSI Channel" 993 " ID: %d\n", phv->phv_host_id, 994 pdv->pdv_channel_id); 995 pdv->pdv_flags |= PDF_HAS_CHANNEL_ID; 996 break; 997 case Opt_scsi_target_id: 998 match_int(args, &arg); 999 pdv->pdv_target_id = arg; 1000 printk(KERN_INFO "PSCSI[%d]: Referencing SCSI Target" 1001 " ID: %d\n", phv->phv_host_id, 1002 pdv->pdv_target_id); 1003 pdv->pdv_flags |= PDF_HAS_TARGET_ID; 1004 break; 1005 case Opt_scsi_lun_id: 1006 match_int(args, &arg); 1007 pdv->pdv_lun_id = arg; 1008 printk(KERN_INFO "PSCSI[%d]: Referencing SCSI LUN ID:" 1009 " %d\n", phv->phv_host_id, pdv->pdv_lun_id); 1010 pdv->pdv_flags |= PDF_HAS_LUN_ID; 1011 break; 1012 default: 1013 break; 1014 } 1015 } 1016 1017 out: 1018 kfree(orig); 1019 return (!ret) ? count : ret; 1020 } 1021 1022 static ssize_t pscsi_check_configfs_dev_params( 1023 struct se_hba *hba, 1024 struct se_subsystem_dev *se_dev) 1025 { 1026 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr; 1027 1028 if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) || 1029 !(pdv->pdv_flags & PDF_HAS_TARGET_ID) || 1030 !(pdv->pdv_flags & PDF_HAS_LUN_ID)) { 1031 printk(KERN_ERR "Missing scsi_channel_id=, scsi_target_id= and" 1032 " scsi_lun_id= parameters\n"); 1033 return -1; 1034 } 1035 1036 return 0; 1037 } 1038 1039 static ssize_t pscsi_show_configfs_dev_params(struct se_hba *hba, 1040 struct se_subsystem_dev *se_dev, 1041 char *b) 1042 { 1043 struct pscsi_hba_virt *phv = hba->hba_ptr; 1044 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr; 1045 struct scsi_device *sd = pdv->pdv_sd; 1046 unsigned char host_id[16]; 1047 ssize_t bl; 1048 int i; 1049 1050 if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) 1051 snprintf(host_id, 16, "%d", pdv->pdv_host_id); 1052 else 1053 snprintf(host_id, 16, "PHBA Mode"); 1054 1055 bl = sprintf(b, "SCSI Device Bus Location:" 1056 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n", 1057 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id, 1058 host_id); 1059 1060 if (sd) { 1061 bl += sprintf(b + bl, " "); 1062 bl += sprintf(b + bl, "Vendor: "); 1063 for (i = 0; i < 8; i++) { 1064 if (ISPRINT(sd->vendor[i])) /* printable character? */ 1065 bl += sprintf(b + bl, "%c", sd->vendor[i]); 1066 else 1067 bl += sprintf(b + bl, " "); 1068 } 1069 bl += sprintf(b + bl, " Model: "); 1070 for (i = 0; i < 16; i++) { 1071 if (ISPRINT(sd->model[i])) /* printable character ? */ 1072 bl += sprintf(b + bl, "%c", sd->model[i]); 1073 else 1074 bl += sprintf(b + bl, " "); 1075 } 1076 bl += sprintf(b + bl, " Rev: "); 1077 for (i = 0; i < 4; i++) { 1078 if (ISPRINT(sd->rev[i])) /* printable character ? */ 1079 bl += sprintf(b + bl, "%c", sd->rev[i]); 1080 else 1081 bl += sprintf(b + bl, " "); 1082 } 1083 bl += sprintf(b + bl, "\n"); 1084 } 1085 return bl; 1086 } 1087 1088 static void pscsi_bi_endio(struct bio *bio, int error) 1089 { 1090 bio_put(bio); 1091 } 1092 1093 static inline struct bio *pscsi_get_bio(struct pscsi_dev_virt *pdv, int sg_num) 1094 { 1095 struct bio *bio; 1096 /* 1097 * Use bio_malloc() following the comment in for bio -> struct request 1098 * in block/blk-core.c:blk_make_request() 1099 */ 1100 bio = bio_kmalloc(GFP_KERNEL, sg_num); 1101 if (!(bio)) { 1102 printk(KERN_ERR "PSCSI: bio_kmalloc() failed\n"); 1103 return NULL; 1104 } 1105 bio->bi_end_io = pscsi_bi_endio; 1106 1107 return bio; 1108 } 1109 1110 #if 0 1111 #define DEBUG_PSCSI(x...) printk(x) 1112 #else 1113 #define DEBUG_PSCSI(x...) 1114 #endif 1115 1116 static int __pscsi_map_task_SG( 1117 struct se_task *task, 1118 struct scatterlist *task_sg, 1119 u32 task_sg_num, 1120 int bidi_read) 1121 { 1122 struct pscsi_plugin_task *pt = PSCSI_TASK(task); 1123 struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr; 1124 struct bio *bio = NULL, *hbio = NULL, *tbio = NULL; 1125 struct page *page; 1126 struct scatterlist *sg; 1127 u32 data_len = task->task_size, i, len, bytes, off; 1128 int nr_pages = (task->task_size + task_sg[0].offset + 1129 PAGE_SIZE - 1) >> PAGE_SHIFT; 1130 int nr_vecs = 0, rc, ret = PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES; 1131 int rw = (task->task_data_direction == DMA_TO_DEVICE); 1132 1133 if (!task->task_size) 1134 return 0; 1135 /* 1136 * For SCF_SCSI_DATA_SG_IO_CDB, Use fs/bio.c:bio_add_page() to setup 1137 * the bio_vec maplist from TC< struct se_mem -> task->task_sg -> 1138 * struct scatterlist memory. The struct se_task->task_sg[] currently needs 1139 * to be attached to struct bios for submission to Linux/SCSI using 1140 * struct request to struct scsi_device->request_queue. 1141 * 1142 * Note that this will be changing post v2.6.28 as Target_Core_Mod/pSCSI 1143 * is ported to upstream SCSI passthrough functionality that accepts 1144 * struct scatterlist->page_link or struct page as a paraemeter. 1145 */ 1146 DEBUG_PSCSI("PSCSI: nr_pages: %d\n", nr_pages); 1147 1148 for_each_sg(task_sg, sg, task_sg_num, i) { 1149 page = sg_page(sg); 1150 off = sg->offset; 1151 len = sg->length; 1152 1153 DEBUG_PSCSI("PSCSI: i: %d page: %p len: %d off: %d\n", i, 1154 page, len, off); 1155 1156 while (len > 0 && data_len > 0) { 1157 bytes = min_t(unsigned int, len, PAGE_SIZE - off); 1158 bytes = min(bytes, data_len); 1159 1160 if (!(bio)) { 1161 nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages); 1162 nr_pages -= nr_vecs; 1163 /* 1164 * Calls bio_kmalloc() and sets bio->bi_end_io() 1165 */ 1166 bio = pscsi_get_bio(pdv, nr_vecs); 1167 if (!(bio)) 1168 goto fail; 1169 1170 if (rw) 1171 bio->bi_rw |= REQ_WRITE; 1172 1173 DEBUG_PSCSI("PSCSI: Allocated bio: %p," 1174 " dir: %s nr_vecs: %d\n", bio, 1175 (rw) ? "rw" : "r", nr_vecs); 1176 /* 1177 * Set *hbio pointer to handle the case: 1178 * nr_pages > BIO_MAX_PAGES, where additional 1179 * bios need to be added to complete a given 1180 * struct se_task 1181 */ 1182 if (!hbio) 1183 hbio = tbio = bio; 1184 else 1185 tbio = tbio->bi_next = bio; 1186 } 1187 1188 DEBUG_PSCSI("PSCSI: Calling bio_add_pc_page() i: %d" 1189 " bio: %p page: %p len: %d off: %d\n", i, bio, 1190 page, len, off); 1191 1192 rc = bio_add_pc_page(pdv->pdv_sd->request_queue, 1193 bio, page, bytes, off); 1194 if (rc != bytes) 1195 goto fail; 1196 1197 DEBUG_PSCSI("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n", 1198 bio->bi_vcnt, nr_vecs); 1199 1200 if (bio->bi_vcnt > nr_vecs) { 1201 DEBUG_PSCSI("PSCSI: Reached bio->bi_vcnt max:" 1202 " %d i: %d bio: %p, allocating another" 1203 " bio\n", bio->bi_vcnt, i, bio); 1204 /* 1205 * Clear the pointer so that another bio will 1206 * be allocated with pscsi_get_bio() above, the 1207 * current bio has already been set *tbio and 1208 * bio->bi_next. 1209 */ 1210 bio = NULL; 1211 } 1212 1213 page++; 1214 len -= bytes; 1215 data_len -= bytes; 1216 off = 0; 1217 } 1218 } 1219 /* 1220 * Setup the primary pt->pscsi_req used for non BIDI and BIDI-COMMAND 1221 * primary SCSI WRITE poayload mapped for struct se_task->task_sg[] 1222 */ 1223 if (!(bidi_read)) { 1224 /* 1225 * Starting with v2.6.31, call blk_make_request() passing in *hbio to 1226 * allocate the pSCSI task a struct request. 1227 */ 1228 pt->pscsi_req = blk_make_request(pdv->pdv_sd->request_queue, 1229 hbio, GFP_KERNEL); 1230 if (!(pt->pscsi_req)) { 1231 printk(KERN_ERR "pSCSI: blk_make_request() failed\n"); 1232 goto fail; 1233 } 1234 /* 1235 * Setup the newly allocated struct request for REQ_TYPE_BLOCK_PC, 1236 * and setup rq callback, CDB and sense. 1237 */ 1238 pscsi_blk_init_request(task, pt, pt->pscsi_req, 0); 1239 1240 return task->task_sg_num; 1241 } 1242 /* 1243 * Setup the secondary pt->pscsi_req->next_rq used for the extra BIDI-COMMAND 1244 * SCSI READ paylaod mapped for struct se_task->task_sg_bidi[] 1245 */ 1246 pt->pscsi_req->next_rq = blk_make_request(pdv->pdv_sd->request_queue, 1247 hbio, GFP_KERNEL); 1248 if (!(pt->pscsi_req->next_rq)) { 1249 printk(KERN_ERR "pSCSI: blk_make_request() failed for BIDI\n"); 1250 goto fail; 1251 } 1252 pscsi_blk_init_request(task, pt, pt->pscsi_req->next_rq, 1); 1253 1254 return task->task_sg_num; 1255 fail: 1256 while (hbio) { 1257 bio = hbio; 1258 hbio = hbio->bi_next; 1259 bio->bi_next = NULL; 1260 bio_endio(bio, 0); 1261 } 1262 return ret; 1263 } 1264 1265 static int pscsi_map_task_SG(struct se_task *task) 1266 { 1267 int ret; 1268 1269 /* 1270 * Setup the main struct request for the task->task_sg[] payload 1271 */ 1272 1273 ret = __pscsi_map_task_SG(task, task->task_sg, task->task_sg_num, 0); 1274 if (ret >= 0 && task->task_sg_bidi) { 1275 /* 1276 * If present, set up the extra BIDI-COMMAND SCSI READ 1277 * struct request and payload. 1278 */ 1279 ret = __pscsi_map_task_SG(task, task->task_sg_bidi, 1280 task->task_sg_num, 1); 1281 } 1282 1283 if (ret < 0) 1284 return PYX_TRANSPORT_LU_COMM_FAILURE; 1285 return 0; 1286 } 1287 1288 /* pscsi_map_task_non_SG(): 1289 * 1290 * 1291 */ 1292 static int pscsi_map_task_non_SG(struct se_task *task) 1293 { 1294 struct se_cmd *cmd = TASK_CMD(task); 1295 struct pscsi_plugin_task *pt = PSCSI_TASK(task); 1296 struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr; 1297 int ret = 0; 1298 1299 if (pscsi_blk_get_request(task) < 0) 1300 return PYX_TRANSPORT_LU_COMM_FAILURE; 1301 1302 if (!task->task_size) 1303 return 0; 1304 1305 ret = blk_rq_map_kern(pdv->pdv_sd->request_queue, 1306 pt->pscsi_req, T_TASK(cmd)->t_task_buf, 1307 task->task_size, GFP_KERNEL); 1308 if (ret < 0) { 1309 printk(KERN_ERR "PSCSI: blk_rq_map_kern() failed: %d\n", ret); 1310 return PYX_TRANSPORT_LU_COMM_FAILURE; 1311 } 1312 return 0; 1313 } 1314 1315 static int pscsi_CDB_none(struct se_task *task) 1316 { 1317 return pscsi_blk_get_request(task); 1318 } 1319 1320 /* pscsi_get_cdb(): 1321 * 1322 * 1323 */ 1324 static unsigned char *pscsi_get_cdb(struct se_task *task) 1325 { 1326 struct pscsi_plugin_task *pt = PSCSI_TASK(task); 1327 1328 return pt->pscsi_cdb; 1329 } 1330 1331 /* pscsi_get_sense_buffer(): 1332 * 1333 * 1334 */ 1335 static unsigned char *pscsi_get_sense_buffer(struct se_task *task) 1336 { 1337 struct pscsi_plugin_task *pt = PSCSI_TASK(task); 1338 1339 return (unsigned char *)&pt->pscsi_sense[0]; 1340 } 1341 1342 /* pscsi_get_device_rev(): 1343 * 1344 * 1345 */ 1346 static u32 pscsi_get_device_rev(struct se_device *dev) 1347 { 1348 struct pscsi_dev_virt *pdv = dev->dev_ptr; 1349 struct scsi_device *sd = pdv->pdv_sd; 1350 1351 return (sd->scsi_level - 1) ? sd->scsi_level - 1 : 1; 1352 } 1353 1354 /* pscsi_get_device_type(): 1355 * 1356 * 1357 */ 1358 static u32 pscsi_get_device_type(struct se_device *dev) 1359 { 1360 struct pscsi_dev_virt *pdv = dev->dev_ptr; 1361 struct scsi_device *sd = pdv->pdv_sd; 1362 1363 return sd->type; 1364 } 1365 1366 static sector_t pscsi_get_blocks(struct se_device *dev) 1367 { 1368 struct pscsi_dev_virt *pdv = dev->dev_ptr; 1369 1370 if (pdv->pdv_bd && pdv->pdv_bd->bd_part) 1371 return pdv->pdv_bd->bd_part->nr_sects; 1372 1373 dump_stack(); 1374 return 0; 1375 } 1376 1377 /* pscsi_handle_SAM_STATUS_failures(): 1378 * 1379 * 1380 */ 1381 static inline void pscsi_process_SAM_status( 1382 struct se_task *task, 1383 struct pscsi_plugin_task *pt) 1384 { 1385 task->task_scsi_status = status_byte(pt->pscsi_result); 1386 if ((task->task_scsi_status)) { 1387 task->task_scsi_status <<= 1; 1388 printk(KERN_INFO "PSCSI Status Byte exception at task: %p CDB:" 1389 " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0], 1390 pt->pscsi_result); 1391 } 1392 1393 switch (host_byte(pt->pscsi_result)) { 1394 case DID_OK: 1395 transport_complete_task(task, (!task->task_scsi_status)); 1396 break; 1397 default: 1398 printk(KERN_INFO "PSCSI Host Byte exception at task: %p CDB:" 1399 " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0], 1400 pt->pscsi_result); 1401 task->task_scsi_status = SAM_STAT_CHECK_CONDITION; 1402 task->task_error_status = PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; 1403 TASK_CMD(task)->transport_error_status = 1404 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; 1405 transport_complete_task(task, 0); 1406 break; 1407 } 1408 1409 return; 1410 } 1411 1412 static void pscsi_req_done(struct request *req, int uptodate) 1413 { 1414 struct se_task *task = req->end_io_data; 1415 struct pscsi_plugin_task *pt = PSCSI_TASK(task); 1416 1417 pt->pscsi_result = req->errors; 1418 pt->pscsi_resid = req->resid_len; 1419 1420 pscsi_process_SAM_status(task, pt); 1421 /* 1422 * Release BIDI-READ if present 1423 */ 1424 if (req->next_rq != NULL) 1425 __blk_put_request(req->q, req->next_rq); 1426 1427 __blk_put_request(req->q, req); 1428 pt->pscsi_req = NULL; 1429 } 1430 1431 static struct se_subsystem_api pscsi_template = { 1432 .name = "pscsi", 1433 .owner = THIS_MODULE, 1434 .transport_type = TRANSPORT_PLUGIN_PHBA_PDEV, 1435 .cdb_none = pscsi_CDB_none, 1436 .map_task_non_SG = pscsi_map_task_non_SG, 1437 .map_task_SG = pscsi_map_task_SG, 1438 .attach_hba = pscsi_attach_hba, 1439 .detach_hba = pscsi_detach_hba, 1440 .pmode_enable_hba = pscsi_pmode_enable_hba, 1441 .allocate_virtdevice = pscsi_allocate_virtdevice, 1442 .create_virtdevice = pscsi_create_virtdevice, 1443 .free_device = pscsi_free_device, 1444 .transport_complete = pscsi_transport_complete, 1445 .alloc_task = pscsi_alloc_task, 1446 .do_task = pscsi_do_task, 1447 .free_task = pscsi_free_task, 1448 .check_configfs_dev_params = pscsi_check_configfs_dev_params, 1449 .set_configfs_dev_params = pscsi_set_configfs_dev_params, 1450 .show_configfs_dev_params = pscsi_show_configfs_dev_params, 1451 .get_cdb = pscsi_get_cdb, 1452 .get_sense_buffer = pscsi_get_sense_buffer, 1453 .get_device_rev = pscsi_get_device_rev, 1454 .get_device_type = pscsi_get_device_type, 1455 .get_blocks = pscsi_get_blocks, 1456 }; 1457 1458 static int __init pscsi_module_init(void) 1459 { 1460 return transport_subsystem_register(&pscsi_template); 1461 } 1462 1463 static void pscsi_module_exit(void) 1464 { 1465 transport_subsystem_release(&pscsi_template); 1466 } 1467 1468 MODULE_DESCRIPTION("TCM PSCSI subsystem plugin"); 1469 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 1470 MODULE_LICENSE("GPL"); 1471 1472 module_init(pscsi_module_init); 1473 module_exit(pscsi_module_exit); 1474