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