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  * (c) Copyright 2003-2012 RisingTide Systems LLC.
   8  *
   9  * Nicholas A. Bellinger <nab@kernel.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  24  *
  25  ******************************************************************************/
  26
  27 #include <linux/net.h>
  28 #include <linux/string.h>
  29 #include <linux/delay.h>
  30 #include <linux/timer.h>
  31 #include <linux/slab.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/kthread.h>
  34 #include <linux/in.h>
  35 #include <linux/export.h>
  36 #include <net/sock.h>
  37 #include <net/tcp.h>
  38 #include <scsi/scsi.h>
  39 #include <scsi/scsi_device.h>
  40
  41 #include <target/target_core_base.h>
  42 #include <target/target_core_backend.h>
  43 #include <target/target_core_fabric.h>
  44
  45 #include "target_core_internal.h"
  46 #include "target_core_alua.h"
  47 #include "target_core_pr.h"
  48 #include "target_core_ua.h"
  49
  50 static struct se_hba *lun0_hba;
  51 /* not static, needed by tpg.c */
  52 struct se_device *g_lun0_dev;
  53
  54 sense_reason_t
  55 transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
  56 {
  57         struct se_lun *se_lun = NULL;
  58         struct se_session *se_sess = se_cmd->se_sess;
  59         struct se_device *dev;
  60         unsigned long flags;
  61
  62         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG)
  63                 return TCM_NON_EXISTENT_LUN;
  64
  65         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
  66         se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
  67         if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
  68                 struct se_dev_entry *deve = se_cmd->se_deve;
  69
  70                 deve->total_cmds++;
  71                 deve->total_bytes += se_cmd->data_length;
  72
  73                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  74                     (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
  75                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  76                                 " Access for 0x%08x\n",
  77                                 se_cmd->se_tfo->get_fabric_name(),
  78                                 unpacked_lun);
  79                         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
  80                         return TCM_WRITE_PROTECTED;
  81                 }
  82
  83                 if (se_cmd->data_direction == DMA_TO_DEVICE)
  84                         deve->write_bytes += se_cmd->data_length;
  85                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
  86                         deve->read_bytes += se_cmd->data_length;
  87
  88                 deve->deve_cmds++;
  89
  90                 se_lun = deve->se_lun;
  91                 se_cmd->se_lun = deve->se_lun;
  92                 se_cmd->pr_res_key = deve->pr_res_key;
  93                 se_cmd->orig_fe_lun = unpacked_lun;
  94                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
  95         }
  96         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
  97
  98         if (!se_lun) {
  99                 /*
 100                  * Use the se_portal_group->tpg_virt_lun0 to allow for
 101                  * REPORT_LUNS, et al to be returned when no active
 102                  * MappedLUN=0 exists for this Initiator Port.
 103                  */
 104                 if (unpacked_lun != 0) {
 105                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 106                                 " Access for 0x%08x\n",
 107                                 se_cmd->se_tfo->get_fabric_name(),
 108                                 unpacked_lun);
 109                         return TCM_NON_EXISTENT_LUN;
 110                 }
 111                 /*
 112                  * Force WRITE PROTECT for virtual LUN 0
 113                  */
 114                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 115                     (se_cmd->data_direction != DMA_NONE))
 116                         return TCM_WRITE_PROTECTED;
 117
 118                 se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 119                 se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 120                 se_cmd->orig_fe_lun = 0;
 121                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 122         }
 123
 124         /* Directly associate cmd with se_dev */
 125         se_cmd->se_dev = se_lun->lun_se_dev;
 126
 127         /* TODO: get rid of this and use atomics for stats */
 128         dev = se_lun->lun_se_dev;
 129         spin_lock_irqsave(&dev->stats_lock, flags);
 130         dev->num_cmds++;
 131         if (se_cmd->data_direction == DMA_TO_DEVICE)
 132                 dev->write_bytes += se_cmd->data_length;
 133         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 134                 dev->read_bytes += se_cmd->data_length;
 135         spin_unlock_irqrestore(&dev->stats_lock, flags);
 136
 137         spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
 138         list_add_tail(&se_cmd->se_lun_node, &se_lun->lun_cmd_list);
 139         spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
 140
 141         return 0;
 142 }
 143 EXPORT_SYMBOL(transport_lookup_cmd_lun);
 144
 145 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
 146 {
 147         struct se_dev_entry *deve;
 148         struct se_lun *se_lun = NULL;
 149         struct se_session *se_sess = se_cmd->se_sess;
 150         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 151         unsigned long flags;
 152
 153         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG)
 154                 return -ENODEV;
 155
 156         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
 157         se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
 158         deve = se_cmd->se_deve;
 159
 160         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 161                 se_tmr->tmr_lun = deve->se_lun;
 162                 se_cmd->se_lun = deve->se_lun;
 163                 se_lun = deve->se_lun;
 164                 se_cmd->pr_res_key = deve->pr_res_key;
 165                 se_cmd->orig_fe_lun = unpacked_lun;
 166         }
 167         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 168
 169         if (!se_lun) {
 170                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 171                         " Access for 0x%08x\n",
 172                         se_cmd->se_tfo->get_fabric_name(),
 173                         unpacked_lun);
 174                 return -ENODEV;
 175         }
 176
 177         /* Directly associate cmd with se_dev */
 178         se_cmd->se_dev = se_lun->lun_se_dev;
 179         se_tmr->tmr_dev = se_lun->lun_se_dev;
 180
 181         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
 182         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
 183         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
 184
 185         return 0;
 186 }
 187 EXPORT_SYMBOL(transport_lookup_tmr_lun);
 188
 189 /*
 190  * This function is called from core_scsi3_emulate_pro_register_and_move()
 191  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
 192  * when a matching rtpi is found.
 193  */
 194 struct se_dev_entry *core_get_se_deve_from_rtpi(
 195         struct se_node_acl *nacl,
 196         u16 rtpi)
 197 {
 198         struct se_dev_entry *deve;
 199         struct se_lun *lun;
 200         struct se_port *port;
 201         struct se_portal_group *tpg = nacl->se_tpg;
 202         u32 i;
 203
 204         spin_lock_irq(&nacl->device_list_lock);
 205         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 206                 deve = nacl->device_list[i];
 207
 208                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 209                         continue;
 210
 211                 lun = deve->se_lun;
 212                 if (!lun) {
 213                         pr_err("%s device entries device pointer is"
 214                                 " NULL, but Initiator has access.\n",
 215                                 tpg->se_tpg_tfo->get_fabric_name());
 216                         continue;
 217                 }
 218                 port = lun->lun_sep;
 219                 if (!port) {
 220                         pr_err("%s device entries device pointer is"
 221                                 " NULL, but Initiator has access.\n",
 222                                 tpg->se_tpg_tfo->get_fabric_name());
 223                         continue;
 224                 }
 225                 if (port->sep_rtpi != rtpi)
 226                         continue;
 227
 228                 atomic_inc(&deve->pr_ref_count);
 229                 smp_mb__after_atomic_inc();
 230                 spin_unlock_irq(&nacl->device_list_lock);
 231
 232                 return deve;
 233         }
 234         spin_unlock_irq(&nacl->device_list_lock);
 235
 236         return NULL;
 237 }
 238
 239 int core_free_device_list_for_node(
 240         struct se_node_acl *nacl,
 241         struct se_portal_group *tpg)
 242 {
 243         struct se_dev_entry *deve;
 244         struct se_lun *lun;
 245         u32 i;
 246
 247         if (!nacl->device_list)
 248                 return 0;
 249
 250         spin_lock_irq(&nacl->device_list_lock);
 251         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 252                 deve = nacl->device_list[i];
 253
 254                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 255                         continue;
 256
 257                 if (!deve->se_lun) {
 258                         pr_err("%s device entries device pointer is"
 259                                 " NULL, but Initiator has access.\n",
 260                                 tpg->se_tpg_tfo->get_fabric_name());
 261                         continue;
 262                 }
 263                 lun = deve->se_lun;
 264
 265                 spin_unlock_irq(&nacl->device_list_lock);
 266                 core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
 267                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
 268                 spin_lock_irq(&nacl->device_list_lock);
 269         }
 270         spin_unlock_irq(&nacl->device_list_lock);
 271
 272         array_free(nacl->device_list, TRANSPORT_MAX_LUNS_PER_TPG);
 273         nacl->device_list = NULL;
 274
 275         return 0;
 276 }
 277
 278 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
 279 {
 280         struct se_dev_entry *deve;
 281         unsigned long flags;
 282
 283         spin_lock_irqsave(&se_nacl->device_list_lock, flags);
 284         deve = se_nacl->device_list[se_cmd->orig_fe_lun];
 285         deve->deve_cmds--;
 286         spin_unlock_irqrestore(&se_nacl->device_list_lock, flags);
 287 }
 288
 289 void core_update_device_list_access(
 290         u32 mapped_lun,
 291         u32 lun_access,
 292         struct se_node_acl *nacl)
 293 {
 294         struct se_dev_entry *deve;
 295
 296         spin_lock_irq(&nacl->device_list_lock);
 297         deve = nacl->device_list[mapped_lun];
 298         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 299                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 300                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 301         } else {
 302                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 303                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 304         }
 305         spin_unlock_irq(&nacl->device_list_lock);
 306 }
 307
 308 /*      core_enable_device_list_for_node():
 309  *
 310  *
 311  */
 312 int core_enable_device_list_for_node(
 313         struct se_lun *lun,
 314         struct se_lun_acl *lun_acl,
 315         u32 mapped_lun,
 316         u32 lun_access,
 317         struct se_node_acl *nacl,
 318         struct se_portal_group *tpg)
 319 {
 320         struct se_port *port = lun->lun_sep;
 321         struct se_dev_entry *deve;
 322
 323         spin_lock_irq(&nacl->device_list_lock);
 324
 325         deve = nacl->device_list[mapped_lun];
 326
 327         /*
 328          * Check if the call is handling demo mode -> explict LUN ACL
 329          * transition.  This transition must be for the same struct se_lun
 330          * + mapped_lun that was setup in demo mode..
 331          */
 332         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 333                 if (deve->se_lun_acl != NULL) {
 334                         pr_err("struct se_dev_entry->se_lun_acl"
 335                                " already set for demo mode -> explict"
 336                                " LUN ACL transition\n");
 337                         spin_unlock_irq(&nacl->device_list_lock);
 338                         return -EINVAL;
 339                 }
 340                 if (deve->se_lun != lun) {
 341                         pr_err("struct se_dev_entry->se_lun does"
 342                                " match passed struct se_lun for demo mode"
 343                                " -> explict LUN ACL transition\n");
 344                         spin_unlock_irq(&nacl->device_list_lock);
 345                         return -EINVAL;
 346                 }
 347                 deve->se_lun_acl = lun_acl;
 348
 349                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 350                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 351                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 352                 } else {
 353                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 354                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 355                 }
 356
 357                 spin_unlock_irq(&nacl->device_list_lock);
 358                 return 0;
 359         }
 360
 361         deve->se_lun = lun;
 362         deve->se_lun_acl = lun_acl;
 363         deve->mapped_lun = mapped_lun;
 364         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
 365
 366         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 367                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 368                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 369         } else {
 370                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 371                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 372         }
 373
 374         deve->creation_time = get_jiffies_64();
 375         deve->attach_count++;
 376         spin_unlock_irq(&nacl->device_list_lock);
 377
 378         spin_lock_bh(&port->sep_alua_lock);
 379         list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
 380         spin_unlock_bh(&port->sep_alua_lock);
 381
 382         return 0;
 383 }
 384
 385 /*      core_disable_device_list_for_node():
 386  *
 387  *
 388  */
 389 int core_disable_device_list_for_node(
 390         struct se_lun *lun,
 391         struct se_lun_acl *lun_acl,
 392         u32 mapped_lun,
 393         u32 lun_access,
 394         struct se_node_acl *nacl,
 395         struct se_portal_group *tpg)
 396 {
 397         struct se_port *port = lun->lun_sep;
 398         struct se_dev_entry *deve = nacl->device_list[mapped_lun];
 399
 400         /*
 401          * If the MappedLUN entry is being disabled, the entry in
 402          * port->sep_alua_list must be removed now before clearing the
 403          * struct se_dev_entry pointers below as logic in
 404          * core_alua_do_transition_tg_pt() depends on these being present.
 405          *
 406          * deve->se_lun_acl will be NULL for demo-mode created LUNs
 407          * that have not been explicitly converted to MappedLUNs ->
 408          * struct se_lun_acl, but we remove deve->alua_port_list from
 409          * port->sep_alua_list. This also means that active UAs and
 410          * NodeACL context specific PR metadata for demo-mode
 411          * MappedLUN *deve will be released below..
 412          */
 413         spin_lock_bh(&port->sep_alua_lock);
 414         list_del(&deve->alua_port_list);
 415         spin_unlock_bh(&port->sep_alua_lock);
 416         /*
 417          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
 418          * PR operation to complete.
 419          */
 420         while (atomic_read(&deve->pr_ref_count) != 0)
 421                 cpu_relax();
 422
 423         spin_lock_irq(&nacl->device_list_lock);
 424         /*
 425          * Disable struct se_dev_entry LUN ACL mapping
 426          */
 427         core_scsi3_ua_release_all(deve);
 428         deve->se_lun = NULL;
 429         deve->se_lun_acl = NULL;
 430         deve->lun_flags = 0;
 431         deve->creation_time = 0;
 432         deve->attach_count--;
 433         spin_unlock_irq(&nacl->device_list_lock);
 434
 435         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
 436         return 0;
 437 }
 438
 439 /*      core_clear_lun_from_tpg():
 440  *
 441  *
 442  */
 443 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 444 {
 445         struct se_node_acl *nacl;
 446         struct se_dev_entry *deve;
 447         u32 i;
 448
 449         spin_lock_irq(&tpg->acl_node_lock);
 450         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 451                 spin_unlock_irq(&tpg->acl_node_lock);
 452
 453                 spin_lock_irq(&nacl->device_list_lock);
 454                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 455                         deve = nacl->device_list[i];
 456                         if (lun != deve->se_lun)
 457                                 continue;
 458                         spin_unlock_irq(&nacl->device_list_lock);
 459
 460                         core_disable_device_list_for_node(lun, NULL,
 461                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
 462                                 nacl, tpg);
 463
 464                         spin_lock_irq(&nacl->device_list_lock);
 465                 }
 466                 spin_unlock_irq(&nacl->device_list_lock);
 467
 468                 spin_lock_irq(&tpg->acl_node_lock);
 469         }
 470         spin_unlock_irq(&tpg->acl_node_lock);
 471 }
 472
 473 static struct se_port *core_alloc_port(struct se_device *dev)
 474 {
 475         struct se_port *port, *port_tmp;
 476
 477         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
 478         if (!port) {
 479                 pr_err("Unable to allocate struct se_port\n");
 480                 return ERR_PTR(-ENOMEM);
 481         }
 482         INIT_LIST_HEAD(&port->sep_alua_list);
 483         INIT_LIST_HEAD(&port->sep_list);
 484         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
 485         spin_lock_init(&port->sep_alua_lock);
 486         mutex_init(&port->sep_tg_pt_md_mutex);
 487
 488         spin_lock(&dev->se_port_lock);
 489         if (dev->dev_port_count == 0x0000ffff) {
 490                 pr_warn("Reached dev->dev_port_count =="
 491                                 " 0x0000ffff\n");
 492                 spin_unlock(&dev->se_port_lock);
 493                 return ERR_PTR(-ENOSPC);
 494         }
 495 again:
 496         /*
 497          * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
 498          * Here is the table from spc4r17 section 7.7.3.8.
 499          *
 500          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 501          *
 502          * Code      Description
 503          * 0h        Reserved
 504          * 1h        Relative port 1, historically known as port A
 505          * 2h        Relative port 2, historically known as port B
 506          * 3h to FFFFh    Relative port 3 through 65 535
 507          */
 508         port->sep_rtpi = dev->dev_rpti_counter++;
 509         if (!port->sep_rtpi)
 510                 goto again;
 511
 512         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
 513                 /*
 514                  * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
 515                  * for 16-bit wrap..
 516                  */
 517                 if (port->sep_rtpi == port_tmp->sep_rtpi)
 518                         goto again;
 519         }
 520         spin_unlock(&dev->se_port_lock);
 521
 522         return port;
 523 }
 524
 525 static void core_export_port(
 526         struct se_device *dev,
 527         struct se_portal_group *tpg,
 528         struct se_port *port,
 529         struct se_lun *lun)
 530 {
 531         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
 532
 533         spin_lock(&dev->se_port_lock);
 534         spin_lock(&lun->lun_sep_lock);
 535         port->sep_tpg = tpg;
 536         port->sep_lun = lun;
 537         lun->lun_sep = port;
 538         spin_unlock(&lun->lun_sep_lock);
 539
 540         list_add_tail(&port->sep_list, &dev->dev_sep_list);
 541         spin_unlock(&dev->se_port_lock);
 542
 543         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV &&
 544             !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
 545                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
 546                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
 547                         pr_err("Unable to allocate t10_alua_tg_pt"
 548                                         "_gp_member_t\n");
 549                         return;
 550                 }
 551                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 552                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
 553                         dev->t10_alua.default_tg_pt_gp);
 554                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 555                 pr_debug("%s/%s: Adding to default ALUA Target Port"
 556                         " Group: alua/default_tg_pt_gp\n",
 557                         dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
 558         }
 559
 560         dev->dev_port_count++;
 561         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFIER */
 562 }
 563
 564 /*
 565  *      Called with struct se_device->se_port_lock spinlock held.
 566  */
 567 static void core_release_port(struct se_device *dev, struct se_port *port)
 568         __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
 569 {
 570         /*
 571          * Wait for any port reference for PR ALL_TG_PT=1 operation
 572          * to complete in __core_scsi3_alloc_registration()
 573          */
 574         spin_unlock(&dev->se_port_lock);
 575         if (atomic_read(&port->sep_tg_pt_ref_cnt))
 576                 cpu_relax();
 577         spin_lock(&dev->se_port_lock);
 578
 579         core_alua_free_tg_pt_gp_mem(port);
 580
 581         list_del(&port->sep_list);
 582         dev->dev_port_count--;
 583         kfree(port);
 584 }
 585
 586 int core_dev_export(
 587         struct se_device *dev,
 588         struct se_portal_group *tpg,
 589         struct se_lun *lun)
 590 {
 591         struct se_hba *hba = dev->se_hba;
 592         struct se_port *port;
 593
 594         port = core_alloc_port(dev);
 595         if (IS_ERR(port))
 596                 return PTR_ERR(port);
 597
 598         lun->lun_se_dev = dev;
 599
 600         spin_lock(&hba->device_lock);
 601         dev->export_count++;
 602         spin_unlock(&hba->device_lock);
 603
 604         core_export_port(dev, tpg, port, lun);
 605         return 0;
 606 }
 607
 608 void core_dev_unexport(
 609         struct se_device *dev,
 610         struct se_portal_group *tpg,
 611         struct se_lun *lun)
 612 {
 613         struct se_hba *hba = dev->se_hba;
 614         struct se_port *port = lun->lun_sep;
 615
 616         spin_lock(&lun->lun_sep_lock);
 617         if (lun->lun_se_dev == NULL) {
 618                 spin_unlock(&lun->lun_sep_lock);
 619                 return;
 620         }
 621         spin_unlock(&lun->lun_sep_lock);
 622
 623         spin_lock(&dev->se_port_lock);
 624         core_release_port(dev, port);
 625         spin_unlock(&dev->se_port_lock);
 626
 627         spin_lock(&hba->device_lock);
 628         dev->export_count--;
 629         spin_unlock(&hba->device_lock);
 630
 631         lun->lun_se_dev = NULL;
 632 }
 633
 634 static void se_release_vpd_for_dev(struct se_device *dev)
 635 {
 636         struct t10_vpd *vpd, *vpd_tmp;
 637
 638         spin_lock(&dev->t10_wwn.t10_vpd_lock);
 639         list_for_each_entry_safe(vpd, vpd_tmp,
 640                         &dev->t10_wwn.t10_vpd_list, vpd_list) {
 641                 list_del(&vpd->vpd_list);
 642                 kfree(vpd);
 643         }
 644         spin_unlock(&dev->t10_wwn.t10_vpd_lock);
 645 }
 646
 647 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 648 {
 649         u32 aligned_max_sectors;
 650         u32 alignment;
 651         /*
 652          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 653          * transport_allocate_data_tasks() operation.
 654          */
 655         alignment = max(1ul, PAGE_SIZE / block_size);
 656         aligned_max_sectors = rounddown(max_sectors, alignment);
 657
 658         if (max_sectors != aligned_max_sectors)
 659                 pr_info("Rounding down aligned max_sectors from %u to %u\n",
 660                         max_sectors, aligned_max_sectors);
 661
 662         return aligned_max_sectors;
 663 }
 664
 665 int se_dev_set_max_unmap_lba_count(
 666         struct se_device *dev,
 667         u32 max_unmap_lba_count)
 668 {
 669         dev->dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
 670         pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
 671                         dev, dev->dev_attrib.max_unmap_lba_count);
 672         return 0;
 673 }
 674
 675 int se_dev_set_max_unmap_block_desc_count(
 676         struct se_device *dev,
 677         u32 max_unmap_block_desc_count)
 678 {
 679         dev->dev_attrib.max_unmap_block_desc_count =
 680                 max_unmap_block_desc_count;
 681         pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
 682                         dev, dev->dev_attrib.max_unmap_block_desc_count);
 683         return 0;
 684 }
 685
 686 int se_dev_set_unmap_granularity(
 687         struct se_device *dev,
 688         u32 unmap_granularity)
 689 {
 690         dev->dev_attrib.unmap_granularity = unmap_granularity;
 691         pr_debug("dev[%p]: Set unmap_granularity: %u\n",
 692                         dev, dev->dev_attrib.unmap_granularity);
 693         return 0;
 694 }
 695
 696 int se_dev_set_unmap_granularity_alignment(
 697         struct se_device *dev,
 698         u32 unmap_granularity_alignment)
 699 {
 700         dev->dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
 701         pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
 702                         dev, dev->dev_attrib.unmap_granularity_alignment);
 703         return 0;
 704 }
 705
 706 int se_dev_set_max_write_same_len(
 707         struct se_device *dev,
 708         u32 max_write_same_len)
 709 {
 710         dev->dev_attrib.max_write_same_len = max_write_same_len;
 711         pr_debug("dev[%p]: Set max_write_same_len: %u\n",
 712                         dev, dev->dev_attrib.max_write_same_len);
 713         return 0;
 714 }
 715
 716 static void dev_set_t10_wwn_model_alias(struct se_device *dev)
 717 {
 718         const char *configname;
 719
 720         configname = config_item_name(&dev->dev_group.cg_item);
 721         if (strlen(configname) >= 16) {
 722                 pr_warn("dev[%p]: Backstore name '%s' is too long for "
 723                         "INQUIRY_MODEL, truncating to 16 bytes\n", dev,
 724                         configname);
 725         }
 726         snprintf(&dev->t10_wwn.model[0], 16, "%s", configname);
 727 }
 728
 729 int se_dev_set_emulate_model_alias(struct se_device *dev, int flag)
 730 {
 731         if (dev->export_count) {
 732                 pr_err("dev[%p]: Unable to change model alias"
 733                         " while export_count is %d\n",
 734                         dev, dev->export_count);
 735                         return -EINVAL;
 736         }
 737
 738         if (flag != 0 && flag != 1) {
 739                 pr_err("Illegal value %d\n", flag);
 740                 return -EINVAL;
 741         }
 742
 743         if (flag) {
 744                 dev_set_t10_wwn_model_alias(dev);
 745         } else {
 746                 strncpy(&dev->t10_wwn.model[0],
 747                         dev->transport->inquiry_prod, 16);
 748         }
 749         dev->dev_attrib.emulate_model_alias = flag;
 750
 751         return 0;
 752 }
 753
 754 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
 755 {
 756         if (flag != 0 && flag != 1) {
 757                 pr_err("Illegal value %d\n", flag);
 758                 return -EINVAL;
 759         }
 760
 761         if (flag) {
 762                 pr_err("dpo_emulated not supported\n");
 763                 return -EINVAL;
 764         }
 765
 766         return 0;
 767 }
 768
 769 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
 770 {
 771         if (flag != 0 && flag != 1) {
 772                 pr_err("Illegal value %d\n", flag);
 773                 return -EINVAL;
 774         }
 775
 776         if (flag &&
 777             dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 778                 pr_err("emulate_fua_write not supported for pSCSI\n");
 779                 return -EINVAL;
 780         }
 781         dev->dev_attrib.emulate_fua_write = flag;
 782         pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
 783                         dev, dev->dev_attrib.emulate_fua_write);
 784         return 0;
 785 }
 786
 787 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
 788 {
 789         if (flag != 0 && flag != 1) {
 790                 pr_err("Illegal value %d\n", flag);
 791                 return -EINVAL;
 792         }
 793
 794         if (flag) {
 795                 pr_err("ua read emulated not supported\n");
 796                 return -EINVAL;
 797         }
 798
 799         return 0;
 800 }
 801
 802 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
 803 {
 804         if (flag != 0 && flag != 1) {
 805                 pr_err("Illegal value %d\n", flag);
 806                 return -EINVAL;
 807         }
 808         if (flag &&
 809             dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 810                 pr_err("emulate_write_cache not supported for pSCSI\n");
 811                 return -EINVAL;
 812         }
 813         if (dev->transport->get_write_cache) {
 814                 pr_warn("emulate_write_cache cannot be changed when underlying"
 815                         " HW reports WriteCacheEnabled, ignoring request\n");
 816                 return 0;
 817         }
 818
 819         dev->dev_attrib.emulate_write_cache = flag;
 820         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
 821                         dev, dev->dev_attrib.emulate_write_cache);
 822         return 0;
 823 }
 824
 825 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
 826 {
 827         if ((flag != 0) && (flag != 1) && (flag != 2)) {
 828                 pr_err("Illegal value %d\n", flag);
 829                 return -EINVAL;
 830         }
 831
 832         if (dev->export_count) {
 833                 pr_err("dev[%p]: Unable to change SE Device"
 834                         " UA_INTRLCK_CTRL while export_count is %d\n",
 835                         dev, dev->export_count);
 836                 return -EINVAL;
 837         }
 838         dev->dev_attrib.emulate_ua_intlck_ctrl = flag;
 839         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
 840                 dev, dev->dev_attrib.emulate_ua_intlck_ctrl);
 841
 842         return 0;
 843 }
 844
 845 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
 846 {
 847         if ((flag != 0) && (flag != 1)) {
 848                 pr_err("Illegal value %d\n", flag);
 849                 return -EINVAL;
 850         }
 851
 852         if (dev->export_count) {
 853                 pr_err("dev[%p]: Unable to change SE Device TAS while"
 854                         " export_count is %d\n",
 855                         dev, dev->export_count);
 856                 return -EINVAL;
 857         }
 858         dev->dev_attrib.emulate_tas = flag;
 859         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
 860                 dev, (dev->dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
 861
 862         return 0;
 863 }
 864
 865 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
 866 {
 867         if ((flag != 0) && (flag != 1)) {
 868                 pr_err("Illegal value %d\n", flag);
 869                 return -EINVAL;
 870         }
 871         /*
 872          * We expect this value to be non-zero when generic Block Layer
 873          * Discard supported is detected iblock_create_virtdevice().
 874          */
 875         if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
 876                 pr_err("Generic Block Discard not supported\n");
 877                 return -ENOSYS;
 878         }
 879
 880         dev->dev_attrib.emulate_tpu = flag;
 881         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
 882                                 dev, flag);
 883         return 0;
 884 }
 885
 886 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
 887 {
 888         if ((flag != 0) && (flag != 1)) {
 889                 pr_err("Illegal value %d\n", flag);
 890                 return -EINVAL;
 891         }
 892         /*
 893          * We expect this value to be non-zero when generic Block Layer
 894          * Discard supported is detected iblock_create_virtdevice().
 895          */
 896         if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
 897                 pr_err("Generic Block Discard not supported\n");
 898                 return -ENOSYS;
 899         }
 900
 901         dev->dev_attrib.emulate_tpws = flag;
 902         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
 903                                 dev, flag);
 904         return 0;
 905 }
 906
 907 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
 908 {
 909         if ((flag != 0) && (flag != 1)) {
 910                 pr_err("Illegal value %d\n", flag);
 911                 return -EINVAL;
 912         }
 913         dev->dev_attrib.enforce_pr_isids = flag;
 914         pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
 915                 (dev->dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
 916         return 0;
 917 }
 918
 919 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
 920 {
 921         if ((flag != 0) && (flag != 1)) {
 922                 printk(KERN_ERR "Illegal value %d\n", flag);
 923                 return -EINVAL;
 924         }
 925         dev->dev_attrib.is_nonrot = flag;
 926         pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
 927                dev, flag);
 928         return 0;
 929 }
 930
 931 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
 932 {
 933         if (flag != 0) {
 934                 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
 935                         " reordering not implemented\n", dev);
 936                 return -ENOSYS;
 937         }
 938         dev->dev_attrib.emulate_rest_reord = flag;
 939         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
 940         return 0;
 941 }
 942
 943 /*
 944  * Note, this can only be called on unexported SE Device Object.
 945  */
 946 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
 947 {
 948         if (dev->export_count) {
 949                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
 950                         " export_count is %d\n",
 951                         dev, dev->export_count);
 952                 return -EINVAL;
 953         }
 954         if (!queue_depth) {
 955                 pr_err("dev[%p]: Illegal ZERO value for queue"
 956                         "_depth\n", dev);
 957                 return -EINVAL;
 958         }
 959
 960         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 961                 if (queue_depth > dev->dev_attrib.hw_queue_depth) {
 962                         pr_err("dev[%p]: Passed queue_depth: %u"
 963                                 " exceeds TCM/SE_Device TCQ: %u\n",
 964                                 dev, queue_depth,
 965                                 dev->dev_attrib.hw_queue_depth);
 966                         return -EINVAL;
 967                 }
 968         } else {
 969                 if (queue_depth > dev->dev_attrib.queue_depth) {
 970                         if (queue_depth > dev->dev_attrib.hw_queue_depth) {
 971                                 pr_err("dev[%p]: Passed queue_depth:"
 972                                         " %u exceeds TCM/SE_Device MAX"
 973                                         " TCQ: %u\n", dev, queue_depth,
 974                                         dev->dev_attrib.hw_queue_depth);
 975                                 return -EINVAL;
 976                         }
 977                 }
 978         }
 979
 980         dev->dev_attrib.queue_depth = dev->queue_depth = queue_depth;
 981         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
 982                         dev, queue_depth);
 983         return 0;
 984 }
 985
 986 int se_dev_set_fabric_max_sectors(struct se_device *dev, u32 fabric_max_sectors)
 987 {
 988         int block_size = dev->dev_attrib.block_size;
 989
 990         if (dev->export_count) {
 991                 pr_err("dev[%p]: Unable to change SE Device"
 992                         " fabric_max_sectors while export_count is %d\n",
 993                         dev, dev->export_count);
 994                 return -EINVAL;
 995         }
 996         if (!fabric_max_sectors) {
 997                 pr_err("dev[%p]: Illegal ZERO value for"
 998                         " fabric_max_sectors\n", dev);
 999                 return -EINVAL;
1000         }
1001         if (fabric_max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1002                 pr_err("dev[%p]: Passed fabric_max_sectors: %u less than"
1003                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, fabric_max_sectors,
1004                                 DA_STATUS_MAX_SECTORS_MIN);
1005                 return -EINVAL;
1006         }
1007         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1008                 if (fabric_max_sectors > dev->dev_attrib.hw_max_sectors) {
1009                         pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1010                                 " greater than TCM/SE_Device max_sectors:"
1011                                 " %u\n", dev, fabric_max_sectors,
1012                                 dev->dev_attrib.hw_max_sectors);
1013                          return -EINVAL;
1014                 }
1015         } else {
1016                 if (fabric_max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1017                         pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1018                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1019                                 " %u\n", dev, fabric_max_sectors,
1020                                 DA_STATUS_MAX_SECTORS_MAX);
1021                         return -EINVAL;
1022                 }
1023         }
1024         /*
1025          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1026          */
1027         if (!block_size) {
1028                 block_size = 512;
1029                 pr_warn("Defaulting to 512 for zero block_size\n");
1030         }
1031         fabric_max_sectors = se_dev_align_max_sectors(fabric_max_sectors,
1032                                                       block_size);
1033
1034         dev->dev_attrib.fabric_max_sectors = fabric_max_sectors;
1035         pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1036                         dev, fabric_max_sectors);
1037         return 0;
1038 }
1039
1040 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1041 {
1042         if (dev->export_count) {
1043                 pr_err("dev[%p]: Unable to change SE Device"
1044                         " optimal_sectors while export_count is %d\n",
1045                         dev, dev->export_count);
1046                 return -EINVAL;
1047         }
1048         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1049                 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1050                                 " changed for TCM/pSCSI\n", dev);
1051                 return -EINVAL;
1052         }
1053         if (optimal_sectors > dev->dev_attrib.fabric_max_sectors) {
1054                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1055                         " greater than fabric_max_sectors: %u\n", dev,
1056                         optimal_sectors, dev->dev_attrib.fabric_max_sectors);
1057                 return -EINVAL;
1058         }
1059
1060         dev->dev_attrib.optimal_sectors = optimal_sectors;
1061         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1062                         dev, optimal_sectors);
1063         return 0;
1064 }
1065
1066 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1067 {
1068         if (dev->export_count) {
1069                 pr_err("dev[%p]: Unable to change SE Device block_size"
1070                         " while export_count is %d\n",
1071                         dev, dev->export_count);
1072                 return -EINVAL;
1073         }
1074
1075         if ((block_size != 512) &&
1076             (block_size != 1024) &&
1077             (block_size != 2048) &&
1078             (block_size != 4096)) {
1079                 pr_err("dev[%p]: Illegal value for block_device: %u"
1080                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1081                         dev, block_size);
1082                 return -EINVAL;
1083         }
1084
1085         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1086                 pr_err("dev[%p]: Not allowed to change block_size for"
1087                         " Physical Device, use for Linux/SCSI to change"
1088                         " block_size for underlying hardware\n", dev);
1089                 return -EINVAL;
1090         }
1091
1092         dev->dev_attrib.block_size = block_size;
1093         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1094                         dev, block_size);
1095         return 0;
1096 }
1097
1098 struct se_lun *core_dev_add_lun(
1099         struct se_portal_group *tpg,
1100         struct se_device *dev,
1101         u32 lun)
1102 {
1103         struct se_lun *lun_p;
1104         int rc;
1105
1106         lun_p = core_tpg_pre_addlun(tpg, lun);
1107         if (IS_ERR(lun_p))
1108                 return lun_p;
1109
1110         rc = core_tpg_post_addlun(tpg, lun_p,
1111                                 TRANSPORT_LUNFLAGS_READ_WRITE, dev);
1112         if (rc < 0)
1113                 return ERR_PTR(rc);
1114
1115         pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1116                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1117                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1118                 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
1119         /*
1120          * Update LUN maps for dynamically added initiators when
1121          * generate_node_acl is enabled.
1122          */
1123         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1124                 struct se_node_acl *acl;
1125                 spin_lock_irq(&tpg->acl_node_lock);
1126                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1127                         if (acl->dynamic_node_acl &&
1128                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1129                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1130                                 spin_unlock_irq(&tpg->acl_node_lock);
1131                                 core_tpg_add_node_to_devs(acl, tpg);
1132                                 spin_lock_irq(&tpg->acl_node_lock);
1133                         }
1134                 }
1135                 spin_unlock_irq(&tpg->acl_node_lock);
1136         }
1137
1138         return lun_p;
1139 }
1140
1141 /*      core_dev_del_lun():
1142  *
1143  *
1144  */
1145 int core_dev_del_lun(
1146         struct se_portal_group *tpg,
1147         u32 unpacked_lun)
1148 {
1149         struct se_lun *lun;
1150
1151         lun = core_tpg_pre_dellun(tpg, unpacked_lun);
1152         if (IS_ERR(lun))
1153                 return PTR_ERR(lun);
1154
1155         core_tpg_post_dellun(tpg, lun);
1156
1157         pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1158                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1159                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1160                 tpg->se_tpg_tfo->get_fabric_name());
1161
1162         return 0;
1163 }
1164
1165 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1166 {
1167         struct se_lun *lun;
1168
1169         spin_lock(&tpg->tpg_lun_lock);
1170         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1171                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1172                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1173                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1174                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1175                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1176                 spin_unlock(&tpg->tpg_lun_lock);
1177                 return NULL;
1178         }
1179         lun = tpg->tpg_lun_list[unpacked_lun];
1180
1181         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1182                 pr_err("%s Logical Unit Number: %u is not free on"
1183                         " Target Portal Group: %hu, ignoring request.\n",
1184                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1185                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1186                 spin_unlock(&tpg->tpg_lun_lock);
1187                 return NULL;
1188         }
1189         spin_unlock(&tpg->tpg_lun_lock);
1190
1191         return lun;
1192 }
1193
1194 /*      core_dev_get_lun():
1195  *
1196  *
1197  */
1198 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1199 {
1200         struct se_lun *lun;
1201
1202         spin_lock(&tpg->tpg_lun_lock);
1203         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1204                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1205                         "_TPG-1: %u for Target Portal Group: %hu\n",
1206                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1207                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1208                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1209                 spin_unlock(&tpg->tpg_lun_lock);
1210                 return NULL;
1211         }
1212         lun = tpg->tpg_lun_list[unpacked_lun];
1213
1214         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1215                 pr_err("%s Logical Unit Number: %u is not active on"
1216                         " Target Portal Group: %hu, ignoring request.\n",
1217                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1218                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1219                 spin_unlock(&tpg->tpg_lun_lock);
1220                 return NULL;
1221         }
1222         spin_unlock(&tpg->tpg_lun_lock);
1223
1224         return lun;
1225 }
1226
1227 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1228         struct se_portal_group *tpg,
1229         struct se_node_acl *nacl,
1230         u32 mapped_lun,
1231         int *ret)
1232 {
1233         struct se_lun_acl *lacl;
1234
1235         if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
1236                 pr_err("%s InitiatorName exceeds maximum size.\n",
1237                         tpg->se_tpg_tfo->get_fabric_name());
1238                 *ret = -EOVERFLOW;
1239                 return NULL;
1240         }
1241         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1242         if (!lacl) {
1243                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1244                 *ret = -ENOMEM;
1245                 return NULL;
1246         }
1247
1248         INIT_LIST_HEAD(&lacl->lacl_list);
1249         lacl->mapped_lun = mapped_lun;
1250         lacl->se_lun_nacl = nacl;
1251         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s",
1252                  nacl->initiatorname);
1253
1254         return lacl;
1255 }
1256
1257 int core_dev_add_initiator_node_lun_acl(
1258         struct se_portal_group *tpg,
1259         struct se_lun_acl *lacl,
1260         u32 unpacked_lun,
1261         u32 lun_access)
1262 {
1263         struct se_lun *lun;
1264         struct se_node_acl *nacl;
1265
1266         lun = core_dev_get_lun(tpg, unpacked_lun);
1267         if (!lun) {
1268                 pr_err("%s Logical Unit Number: %u is not active on"
1269                         " Target Portal Group: %hu, ignoring request.\n",
1270                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1271                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1272                 return -EINVAL;
1273         }
1274
1275         nacl = lacl->se_lun_nacl;
1276         if (!nacl)
1277                 return -EINVAL;
1278
1279         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1280             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1281                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1282
1283         lacl->se_lun = lun;
1284
1285         if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
1286                         lun_access, nacl, tpg) < 0)
1287                 return -EINVAL;
1288
1289         spin_lock(&lun->lun_acl_lock);
1290         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1291         atomic_inc(&lun->lun_acl_count);
1292         smp_mb__after_atomic_inc();
1293         spin_unlock(&lun->lun_acl_lock);
1294
1295         pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1296                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1297                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1298                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1299                 lacl->initiatorname);
1300         /*
1301          * Check to see if there are any existing persistent reservation APTPL
1302          * pre-registrations that need to be enabled for this LUN ACL..
1303          */
1304         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1305         return 0;
1306 }
1307
1308 /*      core_dev_del_initiator_node_lun_acl():
1309  *
1310  *
1311  */
1312 int core_dev_del_initiator_node_lun_acl(
1313         struct se_portal_group *tpg,
1314         struct se_lun *lun,
1315         struct se_lun_acl *lacl)
1316 {
1317         struct se_node_acl *nacl;
1318
1319         nacl = lacl->se_lun_nacl;
1320         if (!nacl)
1321                 return -EINVAL;
1322
1323         spin_lock(&lun->lun_acl_lock);
1324         list_del(&lacl->lacl_list);
1325         atomic_dec(&lun->lun_acl_count);
1326         smp_mb__after_atomic_dec();
1327         spin_unlock(&lun->lun_acl_lock);
1328
1329         core_disable_device_list_for_node(lun, NULL, lacl->mapped_lun,
1330                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
1331
1332         lacl->se_lun = NULL;
1333
1334         pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1335                 " InitiatorNode: %s Mapped LUN: %u\n",
1336                 tpg->se_tpg_tfo->get_fabric_name(),
1337                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1338                 lacl->initiatorname, lacl->mapped_lun);
1339
1340         return 0;
1341 }
1342
1343 void core_dev_free_initiator_node_lun_acl(
1344         struct se_portal_group *tpg,
1345         struct se_lun_acl *lacl)
1346 {
1347         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1348                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1349                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1350                 tpg->se_tpg_tfo->get_fabric_name(),
1351                 lacl->initiatorname, lacl->mapped_lun);
1352
1353         kfree(lacl);
1354 }
1355
1356 static void scsi_dump_inquiry(struct se_device *dev)
1357 {
1358         struct t10_wwn *wwn = &dev->t10_wwn;
1359         char buf[17];
1360         int i, device_type;
1361         /*
1362          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1363          */
1364         for (i = 0; i < 8; i++)
1365                 if (wwn->vendor[i] >= 0x20)
1366                         buf[i] = wwn->vendor[i];
1367                 else
1368                         buf[i] = ' ';
1369         buf[i] = '\0';
1370         pr_debug("  Vendor: %s\n", buf);
1371
1372         for (i = 0; i < 16; i++)
1373                 if (wwn->model[i] >= 0x20)
1374                         buf[i] = wwn->model[i];
1375                 else
1376                         buf[i] = ' ';
1377         buf[i] = '\0';
1378         pr_debug("  Model: %s\n", buf);
1379
1380         for (i = 0; i < 4; i++)
1381                 if (wwn->revision[i] >= 0x20)
1382                         buf[i] = wwn->revision[i];
1383                 else
1384                         buf[i] = ' ';
1385         buf[i] = '\0';
1386         pr_debug("  Revision: %s\n", buf);
1387
1388         device_type = dev->transport->get_device_type(dev);
1389         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1390 }
1391
1392 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
1393 {
1394         struct se_device *dev;
1395
1396         dev = hba->transport->alloc_device(hba, name);
1397         if (!dev)
1398                 return NULL;
1399
1400         dev->dev_link_magic = SE_DEV_LINK_MAGIC;
1401         dev->se_hba = hba;
1402         dev->transport = hba->transport;
1403
1404         INIT_LIST_HEAD(&dev->dev_list);
1405         INIT_LIST_HEAD(&dev->dev_sep_list);
1406         INIT_LIST_HEAD(&dev->dev_tmr_list);
1407         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1408         INIT_LIST_HEAD(&dev->state_list);
1409         INIT_LIST_HEAD(&dev->qf_cmd_list);
1410         spin_lock_init(&dev->stats_lock);
1411         spin_lock_init(&dev->execute_task_lock);
1412         spin_lock_init(&dev->delayed_cmd_lock);
1413         spin_lock_init(&dev->dev_reservation_lock);
1414         spin_lock_init(&dev->se_port_lock);
1415         spin_lock_init(&dev->se_tmr_lock);
1416         spin_lock_init(&dev->qf_cmd_lock);
1417         atomic_set(&dev->dev_ordered_id, 0);
1418         INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
1419         spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
1420         INIT_LIST_HEAD(&dev->t10_pr.registration_list);
1421         INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
1422         spin_lock_init(&dev->t10_pr.registration_lock);
1423         spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
1424         INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
1425         spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
1426
1427         dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1428         dev->t10_wwn.t10_dev = dev;
1429         dev->t10_alua.t10_dev = dev;
1430
1431         dev->dev_attrib.da_dev = dev;
1432         dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
1433         dev->dev_attrib.emulate_dpo = DA_EMULATE_DPO;
1434         dev->dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
1435         dev->dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
1436         dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
1437         dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
1438         dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
1439         dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
1440         dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
1441         dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
1442         dev->dev_attrib.is_nonrot = DA_IS_NONROT;
1443         dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
1444         dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
1445         dev->dev_attrib.max_unmap_block_desc_count =
1446                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
1447         dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
1448         dev->dev_attrib.unmap_granularity_alignment =
1449                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
1450         dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
1451         dev->dev_attrib.fabric_max_sectors = DA_FABRIC_MAX_SECTORS;
1452         dev->dev_attrib.optimal_sectors = DA_FABRIC_MAX_SECTORS;
1453
1454         return dev;
1455 }
1456
1457 int target_configure_device(struct se_device *dev)
1458 {
1459         struct se_hba *hba = dev->se_hba;
1460         int ret;
1461
1462         if (dev->dev_flags & DF_CONFIGURED) {
1463                 pr_err("se_dev->se_dev_ptr already set for storage"
1464                                 " object\n");
1465                 return -EEXIST;
1466         }
1467
1468         ret = dev->transport->configure_device(dev);
1469         if (ret)
1470                 goto out;
1471         dev->dev_flags |= DF_CONFIGURED;
1472
1473         /*
1474          * XXX: there is not much point to have two different values here..
1475          */
1476         dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
1477         dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
1478
1479         /*
1480          * Align max_hw_sectors down to PAGE_SIZE I/O transfers
1481          */
1482         dev->dev_attrib.hw_max_sectors =
1483                 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
1484                                          dev->dev_attrib.hw_block_size);
1485
1486         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1487         dev->creation_time = get_jiffies_64();
1488
1489         ret = core_setup_alua(dev);
1490         if (ret)
1491                 goto out;
1492
1493         /*
1494          * Startup the struct se_device processing thread
1495          */
1496         dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1497                                       dev->transport->name);
1498         if (!dev->tmr_wq) {
1499                 pr_err("Unable to create tmr workqueue for %s\n",
1500                         dev->transport->name);
1501                 ret = -ENOMEM;
1502                 goto out_free_alua;
1503         }
1504
1505         /*
1506          * Setup work_queue for QUEUE_FULL
1507          */
1508         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1509
1510         /*
1511          * Preload the initial INQUIRY const values if we are doing
1512          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1513          * passthrough because this is being provided by the backend LLD.
1514          */
1515         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1516                 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1517                 strncpy(&dev->t10_wwn.model[0],
1518                         dev->transport->inquiry_prod, 16);
1519                 strncpy(&dev->t10_wwn.revision[0],
1520                         dev->transport->inquiry_rev, 4);
1521         }
1522
1523         scsi_dump_inquiry(dev);
1524
1525         spin_lock(&hba->device_lock);
1526         hba->dev_count++;
1527         spin_unlock(&hba->device_lock);
1528         return 0;
1529
1530 out_free_alua:
1531         core_alua_free_lu_gp_mem(dev);
1532 out:
1533         se_release_vpd_for_dev(dev);
1534         return ret;
1535 }
1536
1537 void target_free_device(struct se_device *dev)
1538 {
1539         struct se_hba *hba = dev->se_hba;
1540
1541         WARN_ON(!list_empty(&dev->dev_sep_list));
1542
1543         if (dev->dev_flags & DF_CONFIGURED) {
1544                 destroy_workqueue(dev->tmr_wq);
1545
1546                 spin_lock(&hba->device_lock);
1547                 hba->dev_count--;
1548                 spin_unlock(&hba->device_lock);
1549         }
1550
1551         core_alua_free_lu_gp_mem(dev);
1552         core_scsi3_free_all_registrations(dev);
1553         se_release_vpd_for_dev(dev);
1554
1555         dev->transport->free_device(dev);
1556 }
1557
1558 int core_dev_setup_virtual_lun0(void)
1559 {
1560         struct se_hba *hba;
1561         struct se_device *dev;
1562         char buf[16];
1563         int ret;
1564
1565         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1566         if (IS_ERR(hba))
1567                 return PTR_ERR(hba);
1568
1569         dev = target_alloc_device(hba, "virt_lun0");
1570         if (!dev) {
1571                 ret = -ENOMEM;
1572                 goto out_free_hba;
1573         }
1574
1575         memset(buf, 0, 16);
1576         sprintf(buf, "rd_pages=8");
1577         hba->transport->set_configfs_dev_params(dev, buf, sizeof(buf));
1578
1579         ret = target_configure_device(dev);
1580         if (ret)
1581                 goto out_free_se_dev;
1582
1583         lun0_hba = hba;
1584         g_lun0_dev = dev;
1585         return 0;
1586
1587 out_free_se_dev:
1588         target_free_device(dev);
1589 out_free_hba:
1590         core_delete_hba(hba);
1591         return ret;
1592 }
1593
1594
1595 void core_dev_release_virtual_lun0(void)
1596 {
1597         struct se_hba *hba = lun0_hba;
1598
1599         if (!hba)
1600                 return;
1601
1602         if (g_lun0_dev)
1603                 target_free_device(g_lun0_dev);
1604         core_delete_hba(hba);
1605 }