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/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/scsi_tcq.h>
  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 == MSG_HEAD_TAG),
 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);