drivers/target/target_core_device.c

   1 /*******************************************************************************
   2  * Filename:  target_core_device.c (based on iscsi_target_device.c)
   3  *
   4  * This file contains the TCM Virtual Device and Disk Transport
   5  * agnostic related functions.
   6  *
   7  * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
   8  * Copyright (c) 2005-2006 SBE, Inc.  All Rights Reserved.
   9  * Copyright (c) 2007-2010 Rising Tide Systems
  10  * Copyright (c) 2008-2010 Linux-iSCSI.org
  11  *
  12  * Nicholas A. Bellinger <nab@kernel.org>
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  *
  28  ******************************************************************************/
  29
  30 #include <linux/net.h>
  31 #include <linux/string.h>
  32 #include <linux/delay.h>
  33 #include <linux/timer.h>
  34 #include <linux/slab.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/kthread.h>
  37 #include <linux/in.h>
  38 #include <linux/export.h>
  39 #include <net/sock.h>
  40 #include <net/tcp.h>
  41 #include <scsi/scsi.h>
  42 #include <scsi/scsi_device.h>
  43
  44 #include <target/target_core_base.h>
  45 #include <target/target_core_backend.h>
  46 #include <target/target_core_fabric.h>
  47
  48 #include "target_core_internal.h"
  49 #include "target_core_alua.h"
  50 #include "target_core_pr.h"
  51 #include "target_core_ua.h"
  52
  53 static void se_dev_start(struct se_device *dev);
  54 static void se_dev_stop(struct se_device *dev);
  55
  56 static struct se_hba *lun0_hba;
  57 static struct se_subsystem_dev *lun0_su_dev;
  58 /* not static, needed by tpg.c */
  59 struct se_device *g_lun0_dev;
  60
  61 int transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
  62 {
  63         struct se_lun *se_lun = NULL;
  64         struct se_session *se_sess = se_cmd->se_sess;
  65         struct se_device *dev;
  66         unsigned long flags;
  67
  68         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
  69                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
  70                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
  71                 return -ENODEV;
  72         }
  73
  74         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
  75         se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
  76         if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
  77                 struct se_dev_entry *deve = se_cmd->se_deve;
  78
  79                 deve->total_cmds++;
  80                 deve->total_bytes += se_cmd->data_length;
  81
  82                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  83                     (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
  84                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
  85                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
  86                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  87                                 " Access for 0x%08x\n",
  88                                 se_cmd->se_tfo->get_fabric_name(),
  89                                 unpacked_lun);
  90                         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
  91                         return -EACCES;
  92                 }
  93
  94                 if (se_cmd->data_direction == DMA_TO_DEVICE)
  95                         deve->write_bytes += se_cmd->data_length;
  96                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
  97                         deve->read_bytes += se_cmd->data_length;
  98
  99                 deve->deve_cmds++;
 100
 101                 se_lun = deve->se_lun;
 102                 se_cmd->se_lun = deve->se_lun;
 103                 se_cmd->pr_res_key = deve->pr_res_key;
 104                 se_cmd->orig_fe_lun = unpacked_lun;
 105                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 106         }
 107         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 108
 109         if (!se_lun) {
 110                 /*
 111                  * Use the se_portal_group->tpg_virt_lun0 to allow for
 112                  * REPORT_LUNS, et al to be returned when no active
 113                  * MappedLUN=0 exists for this Initiator Port.
 114                  */
 115                 if (unpacked_lun != 0) {
 116                         se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 117                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 118                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 119                                 " Access for 0x%08x\n",
 120                                 se_cmd->se_tfo->get_fabric_name(),
 121                                 unpacked_lun);
 122                         return -ENODEV;
 123                 }
 124                 /*
 125                  * Force WRITE PROTECT for virtual LUN 0
 126                  */
 127                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 128                     (se_cmd->data_direction != DMA_NONE)) {
 129                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
 130                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 131                         return -EACCES;
 132                 }
 133
 134                 se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 135                 se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 136                 se_cmd->orig_fe_lun = 0;
 137                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 138         }
 139         /*
 140          * Determine if the struct se_lun is online.
 141          * FIXME: Check for LUN_RESET + UNIT Attention
 142          */
 143         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
 144                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 145                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 146                 return -ENODEV;
 147         }
 148
 149         /* Directly associate cmd with se_dev */
 150         se_cmd->se_dev = se_lun->lun_se_dev;
 151
 152         /* TODO: get rid of this and use atomics for stats */
 153         dev = se_lun->lun_se_dev;
 154         spin_lock_irqsave(&dev->stats_lock, flags);
 155         dev->num_cmds++;
 156         if (se_cmd->data_direction == DMA_TO_DEVICE)
 157                 dev->write_bytes += se_cmd->data_length;
 158         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 159                 dev->read_bytes += se_cmd->data_length;
 160         spin_unlock_irqrestore(&dev->stats_lock, flags);
 161
 162         spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
 163         list_add_tail(&se_cmd->se_lun_node, &se_lun->lun_cmd_list);
 164         spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
 165
 166         return 0;
 167 }
 168 EXPORT_SYMBOL(transport_lookup_cmd_lun);
 169
 170 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
 171 {
 172         struct se_dev_entry *deve;
 173         struct se_lun *se_lun = NULL;
 174         struct se_session *se_sess = se_cmd->se_sess;
 175         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 176         unsigned long flags;
 177
 178         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
 179                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 180                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 181                 return -ENODEV;
 182         }
 183
 184         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
 185         se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
 186         deve = se_cmd->se_deve;
 187
 188         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 189                 se_tmr->tmr_lun = deve->se_lun;
 190                 se_cmd->se_lun = deve->se_lun;
 191                 se_lun = deve->se_lun;
 192                 se_cmd->pr_res_key = deve->pr_res_key;
 193                 se_cmd->orig_fe_lun = unpacked_lun;
 194         }
 195         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 196
 197         if (!se_lun) {
 198                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 199                         " Access for 0x%08x\n",
 200                         se_cmd->se_tfo->get_fabric_name(),
 201                         unpacked_lun);
 202                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 203                 return -ENODEV;
 204         }
 205         /*
 206          * Determine if the struct se_lun is online.
 207          * FIXME: Check for LUN_RESET + UNIT Attention
 208          */
 209         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
 210                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 211                 return -ENODEV;
 212         }
 213
 214         /* Directly associate cmd with se_dev */
 215         se_cmd->se_dev = se_lun->lun_se_dev;
 216         se_tmr->tmr_dev = se_lun->lun_se_dev;
 217
 218         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
 219         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
 220         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
 221
 222         return 0;
 223 }
 224 EXPORT_SYMBOL(transport_lookup_tmr_lun);
 225
 226 /*
 227  * This function is called from core_scsi3_emulate_pro_register_and_move()
 228  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
 229  * when a matching rtpi is found.
 230  */
 231 struct se_dev_entry *core_get_se_deve_from_rtpi(
 232         struct se_node_acl *nacl,
 233         u16 rtpi)
 234 {
 235         struct se_dev_entry *deve;
 236         struct se_lun *lun;
 237         struct se_port *port;
 238         struct se_portal_group *tpg = nacl->se_tpg;
 239         u32 i;
 240
 241         spin_lock_irq(&nacl->device_list_lock);
 242         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 243                 deve = nacl->device_list[i];
 244
 245                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 246                         continue;
 247
 248                 lun = deve->se_lun;
 249                 if (!lun) {
 250                         pr_err("%s device entries device pointer is"
 251                                 " NULL, but Initiator has access.\n",
 252                                 tpg->se_tpg_tfo->get_fabric_name());
 253                         continue;
 254                 }
 255                 port = lun->lun_sep;
 256                 if (!port) {
 257                         pr_err("%s device entries device pointer is"
 258                                 " NULL, but Initiator has access.\n",
 259                                 tpg->se_tpg_tfo->get_fabric_name());
 260                         continue;
 261                 }
 262                 if (port->sep_rtpi != rtpi)
 263                         continue;
 264
 265                 atomic_inc(&deve->pr_ref_count);
 266                 smp_mb__after_atomic_inc();
 267                 spin_unlock_irq(&nacl->device_list_lock);
 268
 269                 return deve;
 270         }
 271         spin_unlock_irq(&nacl->device_list_lock);
 272
 273         return NULL;
 274 }
 275
 276 int core_free_device_list_for_node(
 277         struct se_node_acl *nacl,
 278         struct se_portal_group *tpg)
 279 {
 280         struct se_dev_entry *deve;
 281         struct se_lun *lun;
 282         u32 i;
 283
 284         if (!nacl->device_list)
 285                 return 0;
 286
 287         spin_lock_irq(&nacl->device_list_lock);
 288         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 289                 deve = nacl->device_list[i];
 290
 291                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 292                         continue;
 293
 294                 if (!deve->se_lun) {
 295                         pr_err("%s device entries device pointer is"
 296                                 " NULL, but Initiator has access.\n",
 297                                 tpg->se_tpg_tfo->get_fabric_name());
 298                         continue;
 299                 }
 300                 lun = deve->se_lun;
 301
 302                 spin_unlock_irq(&nacl->device_list_lock);
 303                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
 304                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
 305                 spin_lock_irq(&nacl->device_list_lock);
 306         }
 307         spin_unlock_irq(&nacl->device_list_lock);
 308
 309         array_free(nacl->device_list, TRANSPORT_MAX_LUNS_PER_TPG);
 310         nacl->device_list = NULL;
 311
 312         return 0;
 313 }
 314
 315 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
 316 {
 317         struct se_dev_entry *deve;
 318         unsigned long flags;
 319
 320         spin_lock_irqsave(&se_nacl->device_list_lock, flags);
 321         deve = se_nacl->device_list[se_cmd->orig_fe_lun];
 322         deve->deve_cmds--;
 323         spin_unlock_irqrestore(&se_nacl->device_list_lock, flags);
 324 }
 325
 326 void core_update_device_list_access(
 327         u32 mapped_lun,
 328         u32 lun_access,
 329         struct se_node_acl *nacl)
 330 {
 331         struct se_dev_entry *deve;
 332
 333         spin_lock_irq(&nacl->device_list_lock);
 334         deve = nacl->device_list[mapped_lun];
 335         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 336                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 337                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 338         } else {
 339                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 340                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 341         }
 342         spin_unlock_irq(&nacl->device_list_lock);
 343 }
 344
 345 /*      core_update_device_list_for_node():
 346  *
 347  *
 348  */
 349 int core_update_device_list_for_node(
 350         struct se_lun *lun,
 351         struct se_lun_acl *lun_acl,
 352         u32 mapped_lun,
 353         u32 lun_access,
 354         struct se_node_acl *nacl,
 355         struct se_portal_group *tpg,
 356         int enable)
 357 {
 358         struct se_port *port = lun->lun_sep;
 359         struct se_dev_entry *deve = nacl->device_list[mapped_lun];
 360         int trans = 0;
 361         /*
 362          * If the MappedLUN entry is being disabled, the entry in
 363          * port->sep_alua_list must be removed now before clearing the
 364          * struct se_dev_entry pointers below as logic in
 365          * core_alua_do_transition_tg_pt() depends on these being present.
 366          */
 367         if (!enable) {
 368                 /*
 369                  * deve->se_lun_acl will be NULL for demo-mode created LUNs
 370                  * that have not been explicitly concerted to MappedLUNs ->
 371                  * struct se_lun_acl, but we remove deve->alua_port_list from
 372                  * port->sep_alua_list. This also means that active UAs and
 373                  * NodeACL context specific PR metadata for demo-mode
 374                  * MappedLUN *deve will be released below..
 375                  */
 376                 spin_lock_bh(&port->sep_alua_lock);
 377                 list_del(&deve->alua_port_list);
 378                 spin_unlock_bh(&port->sep_alua_lock);
 379         }
 380
 381         spin_lock_irq(&nacl->device_list_lock);
 382         if (enable) {
 383                 /*
 384                  * Check if the call is handling demo mode -> explict LUN ACL
 385                  * transition.  This transition must be for the same struct se_lun
 386                  * + mapped_lun that was setup in demo mode..
 387                  */
 388                 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 389                         if (deve->se_lun_acl != NULL) {
 390                                 pr_err("struct se_dev_entry->se_lun_acl"
 391                                         " already set for demo mode -> explict"
 392                                         " LUN ACL transition\n");
 393                                 spin_unlock_irq(&nacl->device_list_lock);
 394                                 return -EINVAL;
 395                         }
 396                         if (deve->se_lun != lun) {
 397                                 pr_err("struct se_dev_entry->se_lun does"
 398                                         " match passed struct se_lun for demo mode"
 399                                         " -> explict LUN ACL transition\n");
 400                                 spin_unlock_irq(&nacl->device_list_lock);
 401                                 return -EINVAL;
 402                         }
 403                         deve->se_lun_acl = lun_acl;
 404                         trans = 1;
 405                 } else {
 406                         deve->se_lun = lun;
 407                         deve->se_lun_acl = lun_acl;
 408                         deve->mapped_lun = mapped_lun;
 409                         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
 410                 }
 411
 412                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 413                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 414                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 415                 } else {
 416                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 417                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 418                 }
 419
 420                 if (trans) {
 421                         spin_unlock_irq(&nacl->device_list_lock);
 422                         return 0;
 423                 }
 424                 deve->creation_time = get_jiffies_64();
 425                 deve->attach_count++;
 426                 spin_unlock_irq(&nacl->device_list_lock);
 427
 428                 spin_lock_bh(&port->sep_alua_lock);
 429                 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
 430                 spin_unlock_bh(&port->sep_alua_lock);
 431
 432                 return 0;
 433         }
 434         /*
 435          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
 436          * PR operation to complete.
 437          */
 438         spin_unlock_irq(&nacl->device_list_lock);
 439         while (atomic_read(&deve->pr_ref_count) != 0)
 440                 cpu_relax();
 441         spin_lock_irq(&nacl->device_list_lock);
 442         /*
 443          * Disable struct se_dev_entry LUN ACL mapping
 444          */
 445         core_scsi3_ua_release_all(deve);
 446         deve->se_lun = NULL;
 447         deve->se_lun_acl = NULL;
 448         deve->lun_flags = 0;
 449         deve->creation_time = 0;
 450         deve->attach_count--;
 451         spin_unlock_irq(&nacl->device_list_lock);
 452
 453         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
 454         return 0;
 455 }
 456
 457 /*      core_clear_lun_from_tpg():
 458  *
 459  *
 460  */
 461 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 462 {
 463         struct se_node_acl *nacl;
 464         struct se_dev_entry *deve;
 465         u32 i;
 466
 467         spin_lock_irq(&tpg->acl_node_lock);
 468         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 469                 spin_unlock_irq(&tpg->acl_node_lock);
 470
 471                 spin_lock_irq(&nacl->device_list_lock);
 472                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 473                         deve = nacl->device_list[i];
 474                         if (lun != deve->se_lun)
 475                                 continue;
 476                         spin_unlock_irq(&nacl->device_list_lock);
 477
 478                         core_update_device_list_for_node(lun, NULL,
 479                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
 480                                 nacl, tpg, 0);
 481
 482                         spin_lock_irq(&nacl->device_list_lock);
 483                 }
 484                 spin_unlock_irq(&nacl->device_list_lock);
 485
 486                 spin_lock_irq(&tpg->acl_node_lock);
 487         }
 488         spin_unlock_irq(&tpg->acl_node_lock);
 489 }
 490
 491 static struct se_port *core_alloc_port(struct se_device *dev)
 492 {
 493         struct se_port *port, *port_tmp;
 494
 495         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
 496         if (!port) {
 497                 pr_err("Unable to allocate struct se_port\n");
 498                 return ERR_PTR(-ENOMEM);
 499         }
 500         INIT_LIST_HEAD(&port->sep_alua_list);
 501         INIT_LIST_HEAD(&port->sep_list);
 502         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
 503         spin_lock_init(&port->sep_alua_lock);
 504         mutex_init(&port->sep_tg_pt_md_mutex);
 505
 506         spin_lock(&dev->se_port_lock);
 507         if (dev->dev_port_count == 0x0000ffff) {
 508                 pr_warn("Reached dev->dev_port_count =="
 509                                 " 0x0000ffff\n");
 510                 spin_unlock(&dev->se_port_lock);
 511                 return ERR_PTR(-ENOSPC);
 512         }
 513 again:
 514         /*
 515          * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
 516          * Here is the table from spc4r17 section 7.7.3.8.
 517          *
 518          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 519          *
 520          * Code      Description
 521          * 0h        Reserved
 522          * 1h        Relative port 1, historically known as port A
 523          * 2h        Relative port 2, historically known as port B
 524          * 3h to FFFFh    Relative port 3 through 65 535
 525          */
 526         port->sep_rtpi = dev->dev_rpti_counter++;
 527         if (!port->sep_rtpi)
 528                 goto again;
 529
 530         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
 531                 /*
 532                  * Make sure RELATIVE TARGET PORT IDENTIFER is unique
 533                  * for 16-bit wrap..
 534                  */
 535                 if (port->sep_rtpi == port_tmp->sep_rtpi)
 536                         goto again;
 537         }
 538         spin_unlock(&dev->se_port_lock);
 539
 540         return port;
 541 }
 542
 543 static void core_export_port(
 544         struct se_device *dev,
 545         struct se_portal_group *tpg,
 546         struct se_port *port,
 547         struct se_lun *lun)
 548 {
 549         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
 550         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
 551
 552         spin_lock(&dev->se_port_lock);
 553         spin_lock(&lun->lun_sep_lock);
 554         port->sep_tpg = tpg;
 555         port->sep_lun = lun;
 556         lun->lun_sep = port;
 557         spin_unlock(&lun->lun_sep_lock);
 558
 559         list_add_tail(&port->sep_list, &dev->dev_sep_list);
 560         spin_unlock(&dev->se_port_lock);
 561
 562         if (su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
 563                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
 564                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
 565                         pr_err("Unable to allocate t10_alua_tg_pt"
 566                                         "_gp_member_t\n");
 567                         return;
 568                 }
 569                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 570                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
 571                         su_dev->t10_alua.default_tg_pt_gp);
 572                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 573                 pr_debug("%s/%s: Adding to default ALUA Target Port"
 574                         " Group: alua/default_tg_pt_gp\n",
 575                         dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
 576         }
 577
 578         dev->dev_port_count++;
 579         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
 580 }
 581
 582 /*
 583  *      Called with struct se_device->se_port_lock spinlock held.
 584  */
 585 static void core_release_port(struct se_device *dev, struct se_port *port)
 586         __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
 587 {
 588         /*
 589          * Wait for any port reference for PR ALL_TG_PT=1 operation
 590          * to complete in __core_scsi3_alloc_registration()
 591          */
 592         spin_unlock(&dev->se_port_lock);
 593         if (atomic_read(&port->sep_tg_pt_ref_cnt))
 594                 cpu_relax();
 595         spin_lock(&dev->se_port_lock);
 596
 597         core_alua_free_tg_pt_gp_mem(port);
 598
 599         list_del(&port->sep_list);
 600         dev->dev_port_count--;
 601         kfree(port);
 602 }
 603
 604 int core_dev_export(
 605         struct se_device *dev,
 606         struct se_portal_group *tpg,
 607         struct se_lun *lun)
 608 {
 609         struct se_port *port;
 610
 611         port = core_alloc_port(dev);
 612         if (IS_ERR(port))
 613                 return PTR_ERR(port);
 614
 615         lun->lun_se_dev = dev;
 616         se_dev_start(dev);
 617
 618         atomic_inc(&dev->dev_export_obj.obj_access_count);
 619         core_export_port(dev, tpg, port, lun);
 620         return 0;
 621 }
 622
 623 void core_dev_unexport(
 624         struct se_device *dev,
 625         struct se_portal_group *tpg,
 626         struct se_lun *lun)
 627 {
 628         struct se_port *port = lun->lun_sep;
 629
 630         spin_lock(&lun->lun_sep_lock);
 631         if (lun->lun_se_dev == NULL) {
 632                 spin_unlock(&lun->lun_sep_lock);
 633                 return;
 634         }
 635         spin_unlock(&lun->lun_sep_lock);
 636
 637         spin_lock(&dev->se_port_lock);
 638         atomic_dec(&dev->dev_export_obj.obj_access_count);
 639         core_release_port(dev, port);
 640         spin_unlock(&dev->se_port_lock);
 641
 642         se_dev_stop(dev);
 643         lun->lun_se_dev = NULL;
 644 }
 645
 646 int target_report_luns(struct se_cmd *se_cmd)
 647 {
 648         struct se_dev_entry *deve;
 649         struct se_session *se_sess = se_cmd->se_sess;
 650         unsigned char *buf;
 651         u32 lun_count = 0, offset = 8, i;
 652
 653         buf = transport_kmap_data_sg(se_cmd);
 654         if (!buf)
 655                 return -ENOMEM;
 656
 657         /*
 658          * If no struct se_session pointer is present, this struct se_cmd is
 659          * coming via a target_core_mod PASSTHROUGH op, and not through
 660          * a $FABRIC_MOD.  In that case, report LUN=0 only.
 661          */
 662         if (!se_sess) {
 663                 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
 664                 lun_count = 1;
 665                 goto done;
 666         }
 667
 668         spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
 669         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 670                 deve = se_sess->se_node_acl->device_list[i];
 671                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 672                         continue;
 673                 /*
 674                  * We determine the correct LUN LIST LENGTH even once we
 675                  * have reached the initial allocation length.
 676                  * See SPC2-R20 7.19.
 677                  */
 678                 lun_count++;
 679                 if ((offset + 8) > se_cmd->data_length)
 680                         continue;
 681
 682                 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
 683                 offset += 8;
 684         }
 685         spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
 686
 687         /*
 688          * See SPC3 r07, page 159.
 689          */
 690 done:
 691         lun_count *= 8;
 692         buf[0] = ((lun_count >> 24) & 0xff);
 693         buf[1] = ((lun_count >> 16) & 0xff);
 694         buf[2] = ((lun_count >> 8) & 0xff);
 695         buf[3] = (lun_count & 0xff);
 696         transport_kunmap_data_sg(se_cmd);
 697
 698         target_complete_cmd(se_cmd, GOOD);
 699         return 0;
 700 }
 701
 702 /*      se_release_device_for_hba():
 703  *
 704  *
 705  */
 706 void se_release_device_for_hba(struct se_device *dev)
 707 {
 708         struct se_hba *hba = dev->se_hba;
 709
 710         if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 711             (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
 712             (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
 713             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
 714             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
 715                 se_dev_stop(dev);
 716
 717         if (dev->dev_ptr) {
 718                 destroy_workqueue(dev->tmr_wq);
 719                 if (dev->transport->free_device)
 720                         dev->transport->free_device(dev->dev_ptr);
 721         }
 722
 723         spin_lock(&hba->device_lock);
 724         list_del(&dev->dev_list);
 725         hba->dev_count--;
 726         spin_unlock(&hba->device_lock);
 727
 728         core_scsi3_free_all_registrations(dev);
 729         se_release_vpd_for_dev(dev);
 730
 731         kfree(dev);
 732 }
 733
 734 void se_release_vpd_for_dev(struct se_device *dev)
 735 {
 736         struct t10_vpd *vpd, *vpd_tmp;
 737
 738         spin_lock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
 739         list_for_each_entry_safe(vpd, vpd_tmp,
 740                         &dev->se_sub_dev->t10_wwn.t10_vpd_list, vpd_list) {
 741                 list_del(&vpd->vpd_list);
 742                 kfree(vpd);
 743         }
 744         spin_unlock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
 745 }
 746
 747 /*      se_free_virtual_device():
 748  *
 749  *      Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
 750  */
 751 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
 752 {
 753         if (!list_empty(&dev->dev_sep_list))
 754                 dump_stack();
 755
 756         core_alua_free_lu_gp_mem(dev);
 757         se_release_device_for_hba(dev);
 758
 759         return 0;
 760 }
 761
 762 static void se_dev_start(struct se_device *dev)
 763 {
 764         struct se_hba *hba = dev->se_hba;
 765
 766         spin_lock(&hba->device_lock);
 767         atomic_inc(&dev->dev_obj.obj_access_count);
 768         if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
 769                 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
 770                         dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
 771                         dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
 772                 } else if (dev->dev_status &
 773                            TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
 774                         dev->dev_status &=
 775                                 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 776                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 777                 }
 778         }
 779         spin_unlock(&hba->device_lock);
 780 }
 781
 782 static void se_dev_stop(struct se_device *dev)
 783 {
 784         struct se_hba *hba = dev->se_hba;
 785
 786         spin_lock(&hba->device_lock);
 787         atomic_dec(&dev->dev_obj.obj_access_count);
 788         if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
 789                 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
 790                         dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
 791                         dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
 792                 } else if (dev->dev_status &
 793                            TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
 794                         dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
 795                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
 796                 }
 797         }
 798         spin_unlock(&hba->device_lock);
 799 }
 800
 801 int se_dev_check_online(struct se_device *dev)
 802 {
 803         unsigned long flags;
 804         int ret;
 805
 806         spin_lock_irqsave(&dev->dev_status_lock, flags);
 807         ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
 808                (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
 809         spin_unlock_irqrestore(&dev->dev_status_lock, flags);
 810
 811         return ret;
 812 }
 813
 814 int se_dev_check_shutdown(struct se_device *dev)
 815 {
 816         int ret;
 817
 818         spin_lock_irq(&dev->dev_status_lock);
 819         ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
 820         spin_unlock_irq(&dev->dev_status_lock);
 821
 822         return ret;
 823 }
 824
 825 u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 826 {
 827         u32 tmp, aligned_max_sectors;
 828         /*
 829          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 830          * transport_allocate_data_tasks() operation.
 831          */
 832         tmp = rounddown((max_sectors * block_size), PAGE_SIZE);
 833         aligned_max_sectors = (tmp / block_size);
 834         if (max_sectors != aligned_max_sectors) {
 835                 printk(KERN_INFO "Rounding down aligned max_sectors from %u"
 836                                 " to %u\n", max_sectors, aligned_max_sectors);
 837                 return aligned_max_sectors;
 838         }
 839
 840         return max_sectors;
 841 }
 842
 843 void se_dev_set_default_attribs(
 844         struct se_device *dev,
 845         struct se_dev_limits *dev_limits)
 846 {
 847         struct queue_limits *limits = &dev_limits->limits;
 848
 849         dev->se_sub_dev->se_dev_attrib.emulate_dpo = DA_EMULATE_DPO;
 850         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
 851         dev->se_sub_dev->se_dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
 852         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
 853         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
 854         dev->se_sub_dev->se_dev_attrib.emulate_tas = DA_EMULATE_TAS;
 855         dev->se_sub_dev->se_dev_attrib.emulate_tpu = DA_EMULATE_TPU;
 856         dev->se_sub_dev->se_dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
 857         dev->se_sub_dev->se_dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
 858         dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA;
 859         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
 860         dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT;
 861         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
 862         /*
 863          * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
 864          * iblock_create_virtdevice() from struct queue_limits values
 865          * if blk_queue_discard()==1
 866          */
 867         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
 868         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
 869                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
 870         dev->se_sub_dev->se_dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
 871         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
 872                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
 873         /*
 874          * block_size is based on subsystem plugin dependent requirements.
 875          */
 876         dev->se_sub_dev->se_dev_attrib.hw_block_size = limits->logical_block_size;
 877         dev->se_sub_dev->se_dev_attrib.block_size = limits->logical_block_size;
 878         /*
 879          * Align max_hw_sectors down to PAGE_SIZE I/O transfers
 880          */
 881         limits->max_hw_sectors = se_dev_align_max_sectors(limits->max_hw_sectors,
 882                                                 limits->logical_block_size);
 883         dev->se_sub_dev->se_dev_attrib.hw_max_sectors = limits->max_hw_sectors;
 884
 885         /*
 886          * Set fabric_max_sectors, which is reported in block limits
 887          * VPD page (B0h).
 888          */
 889         dev->se_sub_dev->se_dev_attrib.fabric_max_sectors = DA_FABRIC_MAX_SECTORS;
 890         /*
 891          * Set optimal_sectors from fabric_max_sectors, which can be
 892          * lowered via configfs.
 893          */
 894         dev->se_sub_dev->se_dev_attrib.optimal_sectors = DA_FABRIC_MAX_SECTORS;
 895         /*
 896          * queue_depth is based on subsystem plugin dependent requirements.
 897          */
 898         dev->se_sub_dev->se_dev_attrib.hw_queue_depth = dev_limits->hw_queue_depth;
 899         dev->se_sub_dev->se_dev_attrib.queue_depth = dev_limits->queue_depth;
 900 }
 901
 902 int se_dev_set_max_unmap_lba_count(
 903         struct se_device *dev,
 904         u32 max_unmap_lba_count)
 905 {
 906         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
 907         pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
 908                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count);
 909         return 0;
 910 }
 911
 912 int se_dev_set_max_unmap_block_desc_count(
 913         struct se_device *dev,
 914         u32 max_unmap_block_desc_count)
 915 {
 916         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
 917                 max_unmap_block_desc_count;
 918         pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
 919                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count);
 920         return 0;
 921 }
 922
 923 int se_dev_set_unmap_granularity(
 924         struct se_device *dev,
 925         u32 unmap_granularity)
 926 {
 927         dev->se_sub_dev->se_dev_attrib.unmap_granularity = unmap_granularity;
 928         pr_debug("dev[%p]: Set unmap_granularity: %u\n",
 929                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity);
 930         return 0;
 931 }
 932
 933 int se_dev_set_unmap_granularity_alignment(
 934         struct se_device *dev,
 935         u32 unmap_granularity_alignment)
 936 {
 937         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
 938         pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
 939                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment);
 940         return 0;
 941 }
 942
 943 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
 944 {
 945         if (flag != 0 && flag != 1) {
 946                 pr_err("Illegal value %d\n", flag);
 947                 return -EINVAL;
 948         }
 949
 950         if (flag) {
 951                 pr_err("dpo_emulated not supported\n");
 952                 return -EINVAL;
 953         }
 954
 955         return 0;
 956 }
 957
 958 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
 959 {
 960         if (flag != 0 && flag != 1) {
 961                 pr_err("Illegal value %d\n", flag);
 962                 return -EINVAL;
 963         }
 964
 965         if (flag && dev->transport->fua_write_emulated == 0) {
 966                 pr_err("fua_write_emulated not supported\n");
 967                 return -EINVAL;
 968         }
 969         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = flag;
 970         pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
 971                         dev, dev->se_sub_dev->se_dev_attrib.emulate_fua_write);
 972         return 0;
 973 }
 974
 975 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
 976 {
 977         if (flag != 0 && flag != 1) {
 978                 pr_err("Illegal value %d\n", flag);
 979                 return -EINVAL;
 980         }
 981
 982         if (flag) {
 983                 pr_err("ua read emulated not supported\n");
 984                 return -EINVAL;
 985         }
 986
 987         return 0;
 988 }
 989
 990 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
 991 {
 992         if (flag != 0 && flag != 1) {
 993                 pr_err("Illegal value %d\n", flag);
 994                 return -EINVAL;
 995         }
 996         if (flag && dev->transport->write_cache_emulated == 0) {
 997                 pr_err("write_cache_emulated not supported\n");
 998                 return -EINVAL;
 999         }
1000         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = flag;
1001         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1002                         dev, dev->se_sub_dev->se_dev_attrib.emulate_write_cache);
1003         return 0;
1004 }
1005
1006 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1007 {
1008         if ((flag != 0) && (flag != 1) && (flag != 2)) {
1009                 pr_err("Illegal value %d\n", flag);
1010                 return -EINVAL;
1011         }
1012
1013         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1014                 pr_err("dev[%p]: Unable to change SE Device"
1015                         " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1016                         " exists\n", dev,
1017                         atomic_read(&dev->dev_export_obj.obj_access_count));
1018                 return -EINVAL;
1019         }
1020         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = flag;
1021         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1022                 dev, dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl);
1023
1024         return 0;
1025 }
1026
1027 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1028 {
1029         if ((flag != 0) && (flag != 1)) {
1030                 pr_err("Illegal value %d\n", flag);
1031                 return -EINVAL;
1032         }
1033
1034         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1035                 pr_err("dev[%p]: Unable to change SE Device TAS while"
1036                         " dev_export_obj: %d count exists\n", dev,
1037                         atomic_read(&dev->dev_export_obj.obj_access_count));
1038                 return -EINVAL;
1039         }
1040         dev->se_sub_dev->se_dev_attrib.emulate_tas = flag;
1041         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1042                 dev, (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
1043
1044         return 0;
1045 }
1046
1047 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1048 {
1049         if ((flag != 0) && (flag != 1)) {
1050                 pr_err("Illegal value %d\n", flag);
1051                 return -EINVAL;
1052         }
1053         /*
1054          * We expect this value to be non-zero when generic Block Layer
1055          * Discard supported is detected iblock_create_virtdevice().
1056          */
1057         if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1058                 pr_err("Generic Block Discard not supported\n");
1059                 return -ENOSYS;
1060         }
1061
1062         dev->se_sub_dev->se_dev_attrib.emulate_tpu = flag;
1063         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1064                                 dev, flag);
1065         return 0;
1066 }
1067
1068 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1069 {
1070         if ((flag != 0) && (flag != 1)) {
1071                 pr_err("Illegal value %d\n", flag);
1072                 return -EINVAL;
1073         }
1074         /*
1075          * We expect this value to be non-zero when generic Block Layer
1076          * Discard supported is detected iblock_create_virtdevice().
1077          */
1078         if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1079                 pr_err("Generic Block Discard not supported\n");
1080                 return -ENOSYS;
1081         }
1082
1083         dev->se_sub_dev->se_dev_attrib.emulate_tpws = flag;
1084         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1085                                 dev, flag);
1086         return 0;
1087 }
1088
1089 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1090 {
1091         if ((flag != 0) && (flag != 1)) {
1092                 pr_err("Illegal value %d\n", flag);
1093                 return -EINVAL;
1094         }
1095         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = flag;
1096         pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1097                 (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1098         return 0;
1099 }
1100
1101 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1102 {
1103         if ((flag != 0) && (flag != 1)) {
1104                 printk(KERN_ERR "Illegal value %d\n", flag);
1105                 return -EINVAL;
1106         }
1107         dev->se_sub_dev->se_dev_attrib.is_nonrot = flag;
1108         pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1109                dev, flag);
1110         return 0;
1111 }
1112
1113 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1114 {
1115         if (flag != 0) {
1116                 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1117                         " reordering not implemented\n", dev);
1118                 return -ENOSYS;
1119         }
1120         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = flag;
1121         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1122         return 0;
1123 }
1124
1125 /*
1126  * Note, this can only be called on unexported SE Device Object.
1127  */
1128 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1129 {
1130         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1131                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1132                         " dev_export_obj: %d count exists\n", dev,
1133                         atomic_read(&dev->dev_export_obj.obj_access_count));
1134                 return -EINVAL;
1135         }
1136         if (!queue_depth) {
1137                 pr_err("dev[%p]: Illegal ZERO value for queue"
1138                         "_depth\n", dev);
1139                 return -EINVAL;
1140         }
1141
1142         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1143                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1144                         pr_err("dev[%p]: Passed queue_depth: %u"
1145                                 " exceeds TCM/SE_Device TCQ: %u\n",
1146                                 dev, queue_depth,
1147                                 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1148                         return -EINVAL;
1149                 }
1150         } else {
1151                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.queue_depth) {
1152                         if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1153                                 pr_err("dev[%p]: Passed queue_depth:"
1154                                         " %u exceeds TCM/SE_Device MAX"
1155                                         " TCQ: %u\n", dev, queue_depth,
1156                                         dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1157                                 return -EINVAL;
1158                         }
1159                 }
1160         }
1161
1162         dev->se_sub_dev->se_dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1163         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1164                         dev, queue_depth);
1165         return 0;
1166 }
1167
1168 int se_dev_set_fabric_max_sectors(struct se_device *dev, u32 fabric_max_sectors)
1169 {
1170         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1171                 pr_err("dev[%p]: Unable to change SE Device"
1172                         " fabric_max_sectors while dev_export_obj: %d count exists\n",
1173                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1174                 return -EINVAL;
1175         }
1176         if (!fabric_max_sectors) {
1177                 pr_err("dev[%p]: Illegal ZERO value for"
1178                         " fabric_max_sectors\n", dev);
1179                 return -EINVAL;
1180         }
1181         if (fabric_max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1182                 pr_err("dev[%p]: Passed fabric_max_sectors: %u less than"
1183                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, fabric_max_sectors,
1184                                 DA_STATUS_MAX_SECTORS_MIN);
1185                 return -EINVAL;
1186         }
1187         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1188                 if (fabric_max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1189                         pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1190                                 " greater than TCM/SE_Device max_sectors:"
1191                                 " %u\n", dev, fabric_max_sectors,
1192                                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1193                          return -EINVAL;
1194                 }
1195         } else {
1196                 if (fabric_max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1197                         pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1198                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1199                                 " %u\n", dev, fabric_max_sectors,
1200                                 DA_STATUS_MAX_SECTORS_MAX);
1201                         return -EINVAL;
1202                 }
1203         }
1204         /*
1205          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1206          */
1207         fabric_max_sectors = se_dev_align_max_sectors(fabric_max_sectors,
1208                                                       dev->se_sub_dev->se_dev_attrib.block_size);
1209
1210         dev->se_sub_dev->se_dev_attrib.fabric_max_sectors = fabric_max_sectors;
1211         pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1212                         dev, fabric_max_sectors);
1213         return 0;
1214 }
1215
1216 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1217 {
1218         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1219                 pr_err("dev[%p]: Unable to change SE Device"
1220                         " optimal_sectors while dev_export_obj: %d count exists\n",
1221                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1222                 return -EINVAL;
1223         }
1224         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1225                 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1226                                 " changed for TCM/pSCSI\n", dev);
1227                 return -EINVAL;
1228         }
1229         if (optimal_sectors > dev->se_sub_dev->se_dev_attrib.fabric_max_sectors) {
1230                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1231                         " greater than fabric_max_sectors: %u\n", dev,
1232                         optimal_sectors, dev->se_sub_dev->se_dev_attrib.fabric_max_sectors);
1233                 return -EINVAL;
1234         }
1235
1236         dev->se_sub_dev->se_dev_attrib.optimal_sectors = optimal_sectors;
1237         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1238                         dev, optimal_sectors);
1239         return 0;
1240 }
1241
1242 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1243 {
1244         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1245                 pr_err("dev[%p]: Unable to change SE Device block_size"
1246                         " while dev_export_obj: %d count exists\n", dev,
1247                         atomic_read(&dev->dev_export_obj.obj_access_count));
1248                 return -EINVAL;
1249         }
1250
1251         if ((block_size != 512) &&
1252             (block_size != 1024) &&
1253             (block_size != 2048) &&
1254             (block_size != 4096)) {
1255                 pr_err("dev[%p]: Illegal value for block_device: %u"
1256                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1257                         dev, block_size);
1258                 return -EINVAL;
1259         }
1260
1261         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1262                 pr_err("dev[%p]: Not allowed to change block_size for"
1263                         " Physical Device, use for Linux/SCSI to change"
1264                         " block_size for underlying hardware\n", dev);
1265                 return -EINVAL;
1266         }
1267
1268         dev->se_sub_dev->se_dev_attrib.block_size = block_size;
1269         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1270                         dev, block_size);
1271         return 0;
1272 }
1273
1274 struct se_lun *core_dev_add_lun(
1275         struct se_portal_group *tpg,
1276         struct se_hba *hba,
1277         struct se_device *dev,
1278         u32 lun)
1279 {
1280         struct se_lun *lun_p;
1281         int rc;
1282
1283         if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1284                 pr_err("Unable to export struct se_device while dev_access_obj: %d\n",
1285                         atomic_read(&dev->dev_access_obj.obj_access_count));
1286                 return ERR_PTR(-EACCES);
1287         }
1288
1289         lun_p = core_tpg_pre_addlun(tpg, lun);
1290         if (IS_ERR(lun_p))
1291                 return lun_p;
1292
1293         rc = core_tpg_post_addlun(tpg, lun_p,
1294                                 TRANSPORT_LUNFLAGS_READ_WRITE, dev);
1295         if (rc < 0)
1296                 return ERR_PTR(rc);
1297
1298         pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1299                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1300                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1301                 tpg->se_tpg_tfo->get_fabric_name(), hba->hba_id);
1302         /*
1303          * Update LUN maps for dynamically added initiators when
1304          * generate_node_acl is enabled.
1305          */
1306         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1307                 struct se_node_acl *acl;
1308                 spin_lock_irq(&tpg->acl_node_lock);
1309                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1310                         if (acl->dynamic_node_acl &&
1311                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1312                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1313                                 spin_unlock_irq(&tpg->acl_node_lock);
1314                                 core_tpg_add_node_to_devs(acl, tpg);
1315                                 spin_lock_irq(&tpg->acl_node_lock);
1316                         }
1317                 }
1318                 spin_unlock_irq(&tpg->acl_node_lock);
1319         }
1320
1321         return lun_p;
1322 }
1323
1324 /*      core_dev_del_lun():
1325  *
1326  *
1327  */
1328 int core_dev_del_lun(
1329         struct se_portal_group *tpg,
1330         u32 unpacked_lun)
1331 {
1332         struct se_lun *lun;
1333
1334         lun = core_tpg_pre_dellun(tpg, unpacked_lun);
1335         if (IS_ERR(lun))
1336                 return PTR_ERR(lun);
1337
1338         core_tpg_post_dellun(tpg, lun);
1339
1340         pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1341                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1342                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1343                 tpg->se_tpg_tfo->get_fabric_name());
1344
1345         return 0;
1346 }
1347
1348 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1349 {
1350         struct se_lun *lun;
1351
1352         spin_lock(&tpg->tpg_lun_lock);
1353         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1354                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1355                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1356                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1357                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1358                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1359                 spin_unlock(&tpg->tpg_lun_lock);
1360                 return NULL;
1361         }
1362         lun = tpg->tpg_lun_list[unpacked_lun];
1363
1364         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1365                 pr_err("%s Logical Unit Number: %u is not free on"
1366                         " Target Portal Group: %hu, ignoring request.\n",
1367                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1368                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1369                 spin_unlock(&tpg->tpg_lun_lock);
1370                 return NULL;
1371         }
1372         spin_unlock(&tpg->tpg_lun_lock);
1373
1374         return lun;
1375 }
1376
1377 /*      core_dev_get_lun():
1378  *
1379  *
1380  */
1381 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1382 {
1383         struct se_lun *lun;
1384
1385         spin_lock(&tpg->tpg_lun_lock);
1386         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1387                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1388                         "_TPG-1: %u for Target Portal Group: %hu\n",
1389                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1390                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1391                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1392                 spin_unlock(&tpg->tpg_lun_lock);
1393                 return NULL;
1394         }
1395         lun = tpg->tpg_lun_list[unpacked_lun];
1396
1397         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1398                 pr_err("%s Logical Unit Number: %u is not active on"
1399                         " Target Portal Group: %hu, ignoring request.\n",
1400                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1401                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1402                 spin_unlock(&tpg->tpg_lun_lock);
1403                 return NULL;
1404         }
1405         spin_unlock(&tpg->tpg_lun_lock);
1406
1407         return lun;
1408 }
1409
1410 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1411         struct se_portal_group *tpg,
1412         u32 mapped_lun,
1413         char *initiatorname,
1414         int *ret)
1415 {
1416         struct se_lun_acl *lacl;
1417         struct se_node_acl *nacl;
1418
1419         if (strlen(initiatorname) >= TRANSPORT_IQN_LEN) {
1420                 pr_err("%s InitiatorName exceeds maximum size.\n",
1421                         tpg->se_tpg_tfo->get_fabric_name());
1422                 *ret = -EOVERFLOW;
1423                 return NULL;
1424         }
1425         nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1426         if (!nacl) {
1427                 *ret = -EINVAL;
1428                 return NULL;
1429         }
1430         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1431         if (!lacl) {
1432                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1433                 *ret = -ENOMEM;
1434                 return NULL;
1435         }
1436
1437         INIT_LIST_HEAD(&lacl->lacl_list);
1438         lacl->mapped_lun = mapped_lun;
1439         lacl->se_lun_nacl = nacl;
1440         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1441
1442         return lacl;
1443 }
1444
1445 int core_dev_add_initiator_node_lun_acl(
1446         struct se_portal_group *tpg,
1447         struct se_lun_acl *lacl,
1448         u32 unpacked_lun,
1449         u32 lun_access)
1450 {
1451         struct se_lun *lun;
1452         struct se_node_acl *nacl;
1453
1454         lun = core_dev_get_lun(tpg, unpacked_lun);
1455         if (!lun) {
1456                 pr_err("%s Logical Unit Number: %u is not active on"
1457                         " Target Portal Group: %hu, ignoring request.\n",
1458                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1459                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1460                 return -EINVAL;
1461         }
1462
1463         nacl = lacl->se_lun_nacl;
1464         if (!nacl)
1465                 return -EINVAL;
1466
1467         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1468             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1469                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1470
1471         lacl->se_lun = lun;
1472
1473         if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1474                         lun_access, nacl, tpg, 1) < 0)
1475                 return -EINVAL;
1476
1477         spin_lock(&lun->lun_acl_lock);
1478         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1479         atomic_inc(&lun->lun_acl_count);
1480         smp_mb__after_atomic_inc();
1481         spin_unlock(&lun->lun_acl_lock);
1482
1483         pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1484                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1485                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1486                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1487                 lacl->initiatorname);
1488         /*
1489          * Check to see if there are any existing persistent reservation APTPL
1490          * pre-registrations that need to be enabled for this LUN ACL..
1491          */
1492         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1493         return 0;
1494 }
1495
1496 /*      core_dev_del_initiator_node_lun_acl():
1497  *
1498  *
1499  */
1500 int core_dev_del_initiator_node_lun_acl(
1501         struct se_portal_group *tpg,
1502         struct se_lun *lun,
1503         struct se_lun_acl *lacl)
1504 {
1505         struct se_node_acl *nacl;
1506
1507         nacl = lacl->se_lun_nacl;
1508         if (!nacl)
1509                 return -EINVAL;
1510
1511         spin_lock(&lun->lun_acl_lock);
1512         list_del(&lacl->lacl_list);
1513         atomic_dec(&lun->lun_acl_count);
1514         smp_mb__after_atomic_dec();
1515         spin_unlock(&lun->lun_acl_lock);
1516
1517         core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1518                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1519
1520         lacl->se_lun = NULL;
1521
1522         pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1523                 " InitiatorNode: %s Mapped LUN: %u\n",
1524                 tpg->se_tpg_tfo->get_fabric_name(),
1525                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1526                 lacl->initiatorname, lacl->mapped_lun);
1527
1528         return 0;
1529 }
1530
1531 void core_dev_free_initiator_node_lun_acl(
1532         struct se_portal_group *tpg,
1533         struct se_lun_acl *lacl)
1534 {
1535         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1536                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1537                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1538                 tpg->se_tpg_tfo->get_fabric_name(),
1539                 lacl->initiatorname, lacl->mapped_lun);
1540
1541         kfree(lacl);
1542 }
1543
1544 int core_dev_setup_virtual_lun0(void)
1545 {
1546         struct se_hba *hba;
1547         struct se_device *dev;
1548         struct se_subsystem_dev *se_dev = NULL;
1549         struct se_subsystem_api *t;
1550         char buf[16];
1551         int ret;
1552
1553         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1554         if (IS_ERR(hba))
1555                 return PTR_ERR(hba);
1556
1557         lun0_hba = hba;
1558         t = hba->transport;
1559
1560         se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1561         if (!se_dev) {
1562                 pr_err("Unable to allocate memory for"
1563                                 " struct se_subsystem_dev\n");
1564                 ret = -ENOMEM;
1565                 goto out;
1566         }
1567         INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1568         spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1569         INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
1570         INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
1571         spin_lock_init(&se_dev->t10_pr.registration_lock);
1572         spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
1573         INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1574         spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1575         spin_lock_init(&se_dev->se_dev_lock);
1576         se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1577         se_dev->t10_wwn.t10_sub_dev = se_dev;
1578         se_dev->t10_alua.t10_sub_dev = se_dev;
1579         se_dev->se_dev_attrib.da_sub_dev = se_dev;
1580         se_dev->se_dev_hba = hba;
1581
1582         se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1583         if (!se_dev->se_dev_su_ptr) {
1584                 pr_err("Unable to locate subsystem dependent pointer"
1585                         " from allocate_virtdevice()\n");
1586                 ret = -ENOMEM;
1587                 goto out;
1588         }
1589         lun0_su_dev = se_dev;
1590
1591         memset(buf, 0, 16);
1592         sprintf(buf, "rd_pages=8");
1593         t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1594
1595         dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1596         if (IS_ERR(dev)) {
1597                 ret = PTR_ERR(dev);
1598                 goto out;
1599         }
1600         se_dev->se_dev_ptr = dev;
1601         g_lun0_dev = dev;
1602
1603         return 0;
1604 out:
1605         lun0_su_dev = NULL;
1606         kfree(se_dev);
1607         if (lun0_hba) {
1608                 core_delete_hba(lun0_hba);
1609                 lun0_hba = NULL;
1610         }
1611         return ret;
1612 }
1613
1614
1615 void core_dev_release_virtual_lun0(void)
1616 {
1617         struct se_hba *hba = lun0_hba;
1618         struct se_subsystem_dev *su_dev = lun0_su_dev;
1619
1620         if (!hba)
1621                 return;
1622
1623         if (g_lun0_dev)
1624                 se_free_virtual_device(g_lun0_dev, hba);
1625
1626         kfree(su_dev);
1627         core_delete_hba(hba);
1628 }