drivers/target/target_core_pscsi.c

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