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 2003-2013 Datera, Inc.
   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 DEFINE_MUTEX(g_device_mutex);
  51 LIST_HEAD(g_device_list);
  52
  53 static struct se_hba *lun0_hba;
  54 /* not static, needed by tpg.c */
  55 struct se_device *g_lun0_dev;
  56
  57 sense_reason_t
  58 transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
  59 {
  60         struct se_lun *se_lun = NULL;
  61         struct se_session *se_sess = se_cmd->se_sess;
  62         struct se_device *dev;
  63         unsigned long flags;
  64
  65         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG)
  66                 return TCM_NON_EXISTENT_LUN;
  67
  68         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
  69         se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
  70         if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
  71                 struct se_dev_entry *deve = se_cmd->se_deve;
  72
  73                 deve->total_cmds++;
  74
  75                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  76                     (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
  77                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  78                                 " Access for 0x%08x\n",
  79                                 se_cmd->se_tfo->get_fabric_name(),
  80                                 unpacked_lun);
  81                         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
  82                         return TCM_WRITE_PROTECTED;
  83                 }
  84
  85                 if (se_cmd->data_direction == DMA_TO_DEVICE)
  86                         deve->write_bytes += se_cmd->data_length;
  87                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
  88                         deve->read_bytes += se_cmd->data_length;
  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                 percpu_ref_get(&se_lun->lun_ref);
  97                 se_cmd->lun_ref_active = true;
  98         }
  99         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 100
 101         if (!se_lun) {
 102                 /*
 103                  * Use the se_portal_group->tpg_virt_lun0 to allow for
 104                  * REPORT_LUNS, et al to be returned when no active
 105                  * MappedLUN=0 exists for this Initiator Port.
 106                  */
 107                 if (unpacked_lun != 0) {
 108                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 109                                 " Access for 0x%08x\n",
 110                                 se_cmd->se_tfo->get_fabric_name(),
 111                                 unpacked_lun);
 112                         return TCM_NON_EXISTENT_LUN;
 113                 }
 114                 /*
 115                  * Force WRITE PROTECT for virtual LUN 0
 116                  */
 117                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 118                     (se_cmd->data_direction != DMA_NONE))
 119                         return TCM_WRITE_PROTECTED;
 120
 121                 se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 122                 se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 123                 se_cmd->orig_fe_lun = 0;
 124                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 125
 126                 percpu_ref_get(&se_lun->lun_ref);
 127                 se_cmd->lun_ref_active = true;
 128         }
 129
 130         /* Directly associate cmd with se_dev */
 131         se_cmd->se_dev = se_lun->lun_se_dev;
 132
 133         dev = se_lun->lun_se_dev;
 134         atomic_long_inc(&dev->num_cmds);
 135         if (se_cmd->data_direction == DMA_TO_DEVICE)
 136                 atomic_long_add(se_cmd->data_length, &dev->write_bytes);
 137         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 138                 atomic_long_add(se_cmd->data_length, &dev->read_bytes);
 139
 140         return 0;
 141 }
 142 EXPORT_SYMBOL(transport_lookup_cmd_lun);
 143
 144 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
 145 {
 146         struct se_dev_entry *deve;
 147         struct se_lun *se_lun = NULL;
 148         struct se_session *se_sess = se_cmd->se_sess;
 149         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 150         unsigned long flags;
 151
 152         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG)
 153                 return -ENODEV;
 154
 155         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
 156         se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
 157         deve = se_cmd->se_deve;
 158
 159         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 160                 se_tmr->tmr_lun = deve->se_lun;
 161                 se_cmd->se_lun = deve->se_lun;
 162                 se_lun = deve->se_lun;
 163                 se_cmd->pr_res_key = deve->pr_res_key;
 164                 se_cmd->orig_fe_lun = unpacked_lun;
 165         }
 166         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 167
 168         if (!se_lun) {
 169                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 170                         " Access for 0x%08x\n",
 171                         se_cmd->se_tfo->get_fabric_name(),
 172                         unpacked_lun);
 173                 return -ENODEV;
 174         }
 175
 176         /* Directly associate cmd with se_dev */
 177         se_cmd->se_dev = se_lun->lun_se_dev;
 178         se_tmr->tmr_dev = se_lun->lun_se_dev;
 179
 180         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
 181         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
 182         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
 183
 184         return 0;
 185 }
 186 EXPORT_SYMBOL(transport_lookup_tmr_lun);
 187
 188 /*
 189  * This function is called from core_scsi3_emulate_pro_register_and_move()
 190  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
 191  * when a matching rtpi is found.
 192  */
 193 struct se_dev_entry *core_get_se_deve_from_rtpi(
 194         struct se_node_acl *nacl,
 195         u16 rtpi)
 196 {
 197         struct se_dev_entry *deve;
 198         struct se_lun *lun;
 199         struct se_port *port;
 200         struct se_portal_group *tpg = nacl->se_tpg;
 201         u32 i;
 202
 203         spin_lock_irq(&nacl->device_list_lock);
 204         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 205                 deve = nacl->device_list[i];
 206
 207                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 208                         continue;
 209
 210                 lun = deve->se_lun;
 211                 if (!lun) {
 212                         pr_err("%s device entries device pointer is"
 213                                 " NULL, but Initiator has access.\n",
 214                                 tpg->se_tpg_tfo->get_fabric_name());
 215                         continue;
 216                 }
 217                 port = lun->lun_sep;
 218                 if (!port) {
 219                         pr_err("%s device entries device pointer is"
 220                                 " NULL, but Initiator has access.\n",
 221                                 tpg->se_tpg_tfo->get_fabric_name());
 222                         continue;
 223                 }
 224                 if (port->sep_rtpi != rtpi)
 225                         continue;
 226
 227                 atomic_inc(&deve->pr_ref_count);
 228                 smp_mb__after_atomic_inc();
 229                 spin_unlock_irq(&nacl->device_list_lock);
 230
 231                 return deve;
 232         }
 233         spin_unlock_irq(&nacl->device_list_lock);
 234
 235         return NULL;
 236 }
 237
 238 int core_free_device_list_for_node(
 239         struct se_node_acl *nacl,
 240         struct se_portal_group *tpg)
 241 {
 242         struct se_dev_entry *deve;
 243         struct se_lun *lun;
 244         u32 i;
 245
 246         if (!nacl->device_list)
 247                 return 0;
 248
 249         spin_lock_irq(&nacl->device_list_lock);
 250         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 251                 deve = nacl->device_list[i];
 252
 253                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 254                         continue;
 255
 256                 if (!deve->se_lun) {
 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                 lun = deve->se_lun;
 263
 264                 spin_unlock_irq(&nacl->device_list_lock);
 265                 core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
 266                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
 267                 spin_lock_irq(&nacl->device_list_lock);
 268         }
 269         spin_unlock_irq(&nacl->device_list_lock);
 270
 271         array_free(nacl->device_list, TRANSPORT_MAX_LUNS_PER_TPG);
 272         nacl->device_list = NULL;
 273
 274         return 0;
 275 }
 276
 277 void core_update_device_list_access(
 278         u32 mapped_lun,
 279         u32 lun_access,
 280         struct se_node_acl *nacl)
 281 {
 282         struct se_dev_entry *deve;
 283
 284         spin_lock_irq(&nacl->device_list_lock);
 285         deve = nacl->device_list[mapped_lun];
 286         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 287                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 288                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 289         } else {
 290                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 291                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 292         }
 293         spin_unlock_irq(&nacl->device_list_lock);
 294 }
 295
 296 /*      core_enable_device_list_for_node():
 297  *
 298  *
 299  */
 300 int core_enable_device_list_for_node(
 301         struct se_lun *lun,
 302         struct se_lun_acl *lun_acl,
 303         u32 mapped_lun,
 304         u32 lun_access,
 305         struct se_node_acl *nacl,
 306         struct se_portal_group *tpg)
 307 {
 308         struct se_port *port = lun->lun_sep;
 309         struct se_dev_entry *deve;
 310
 311         spin_lock_irq(&nacl->device_list_lock);
 312
 313         deve = nacl->device_list[mapped_lun];
 314
 315         /*
 316          * Check if the call is handling demo mode -> explicit LUN ACL
 317          * transition.  This transition must be for the same struct se_lun
 318          * + mapped_lun that was setup in demo mode..
 319          */
 320         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 321                 if (deve->se_lun_acl != NULL) {
 322                         pr_err("struct se_dev_entry->se_lun_acl"
 323                                " already set for demo mode -> explicit"
 324                                " LUN ACL transition\n");
 325                         spin_unlock_irq(&nacl->device_list_lock);
 326                         return -EINVAL;
 327                 }
 328                 if (deve->se_lun != lun) {
 329                         pr_err("struct se_dev_entry->se_lun does"
 330                                " match passed struct se_lun for demo mode"
 331                                " -> explicit LUN ACL transition\n");
 332                         spin_unlock_irq(&nacl->device_list_lock);
 333                         return -EINVAL;
 334                 }
 335                 deve->se_lun_acl = lun_acl;
 336
 337                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 338                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 339                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 340                 } else {
 341                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 342                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 343                 }
 344
 345                 spin_unlock_irq(&nacl->device_list_lock);
 346                 return 0;
 347         }
 348
 349         deve->se_lun = lun;
 350         deve->se_lun_acl = lun_acl;
 351         deve->mapped_lun = mapped_lun;
 352         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
 353
 354         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 355                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 356                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 357         } else {
 358                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 359                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 360         }
 361
 362         deve->creation_time = get_jiffies_64();
 363         deve->attach_count++;
 364         spin_unlock_irq(&nacl->device_list_lock);
 365
 366         spin_lock_bh(&port->sep_alua_lock);
 367         list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
 368         spin_unlock_bh(&port->sep_alua_lock);
 369
 370         return 0;
 371 }
 372
 373 /*      core_disable_device_list_for_node():
 374  *
 375  *
 376  */
 377 int core_disable_device_list_for_node(
 378         struct se_lun *lun,
 379         struct se_lun_acl *lun_acl,
 380         u32 mapped_lun,
 381         u32 lun_access,
 382         struct se_node_acl *nacl,
 383         struct se_portal_group *tpg)
 384 {
 385         struct se_port *port = lun->lun_sep;
 386         struct se_dev_entry *deve = nacl->device_list[mapped_lun];
 387
 388         /*
 389          * If the MappedLUN entry is being disabled, the entry in
 390          * port->sep_alua_list must be removed now before clearing the
 391          * struct se_dev_entry pointers below as logic in
 392          * core_alua_do_transition_tg_pt() depends on these being present.
 393          *
 394          * deve->se_lun_acl will be NULL for demo-mode created LUNs
 395          * that have not been explicitly converted to MappedLUNs ->
 396          * struct se_lun_acl, but we remove deve->alua_port_list from
 397          * port->sep_alua_list. This also means that active UAs and
 398          * NodeACL context specific PR metadata for demo-mode
 399          * MappedLUN *deve will be released below..
 400          */
 401         spin_lock_bh(&port->sep_alua_lock);
 402         list_del(&deve->alua_port_list);
 403         spin_unlock_bh(&port->sep_alua_lock);
 404         /*
 405          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
 406          * PR operation to complete.
 407          */
 408         while (atomic_read(&deve->pr_ref_count) != 0)
 409                 cpu_relax();
 410
 411         spin_lock_irq(&nacl->device_list_lock);
 412         /*
 413          * Disable struct se_dev_entry LUN ACL mapping
 414          */
 415         core_scsi3_ua_release_all(deve);
 416         deve->se_lun = NULL;
 417         deve->se_lun_acl = NULL;
 418         deve->lun_flags = 0;
 419         deve->creation_time = 0;
 420         deve->attach_count--;
 421         spin_unlock_irq(&nacl->device_list_lock);
 422
 423         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
 424         return 0;
 425 }
 426
 427 /*      core_clear_lun_from_tpg():
 428  *
 429  *
 430  */
 431 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 432 {
 433         struct se_node_acl *nacl;
 434         struct se_dev_entry *deve;
 435         u32 i;
 436
 437         spin_lock_irq(&tpg->acl_node_lock);
 438         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 439                 spin_unlock_irq(&tpg->acl_node_lock);
 440
 441                 spin_lock_irq(&nacl->device_list_lock);
 442                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 443                         deve = nacl->device_list[i];
 444                         if (lun != deve->se_lun)
 445                                 continue;
 446                         spin_unlock_irq(&nacl->device_list_lock);
 447
 448                         core_disable_device_list_for_node(lun, NULL,
 449                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
 450                                 nacl, tpg);
 451
 452                         spin_lock_irq(&nacl->device_list_lock);
 453                 }
 454                 spin_unlock_irq(&nacl->device_list_lock);
 455
 456                 spin_lock_irq(&tpg->acl_node_lock);
 457         }
 458         spin_unlock_irq(&tpg->acl_node_lock);
 459 }
 460
 461 static struct se_port *core_alloc_port(struct se_device *dev)
 462 {
 463         struct se_port *port, *port_tmp;
 464
 465         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
 466         if (!port) {
 467                 pr_err("Unable to allocate struct se_port\n");
 468                 return ERR_PTR(-ENOMEM);
 469         }
 470         INIT_LIST_HEAD(&port->sep_alua_list);
 471         INIT_LIST_HEAD(&port->sep_list);
 472         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
 473         spin_lock_init(&port->sep_alua_lock);
 474         mutex_init(&port->sep_tg_pt_md_mutex);
 475
 476         spin_lock(&dev->se_port_lock);
 477         if (dev->dev_port_count == 0x0000ffff) {
 478                 pr_warn("Reached dev->dev_port_count =="
 479                                 " 0x0000ffff\n");
 480                 spin_unlock(&dev->se_port_lock);
 481                 return ERR_PTR(-ENOSPC);
 482         }
 483 again:
 484         /*
 485          * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
 486          * Here is the table from spc4r17 section 7.7.3.8.
 487          *
 488          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 489          *
 490          * Code      Description
 491          * 0h        Reserved
 492          * 1h        Relative port 1, historically known as port A
 493          * 2h        Relative port 2, historically known as port B
 494          * 3h to FFFFh    Relative port 3 through 65 535
 495          */
 496         port->sep_rtpi = dev->dev_rpti_counter++;
 497         if (!port->sep_rtpi)
 498                 goto again;
 499
 500         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
 501                 /*
 502                  * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
 503                  * for 16-bit wrap..
 504                  */
 505                 if (port->sep_rtpi == port_tmp->sep_rtpi)
 506                         goto again;
 507         }
 508         spin_unlock(&dev->se_port_lock);
 509
 510         return port;
 511 }
 512
 513 static void core_export_port(
 514         struct se_device *dev,
 515         struct se_portal_group *tpg,
 516         struct se_port *port,
 517         struct se_lun *lun)
 518 {
 519         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
 520
 521         spin_lock(&dev->se_port_lock);
 522         spin_lock(&lun->lun_sep_lock);
 523         port->sep_tpg = tpg;
 524         port->sep_lun = lun;
 525         lun->lun_sep = port;
 526         spin_unlock(&lun->lun_sep_lock);
 527
 528         list_add_tail(&port->sep_list, &dev->dev_sep_list);
 529         spin_unlock(&dev->se_port_lock);
 530
 531         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV &&
 532             !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
 533                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
 534                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
 535                         pr_err("Unable to allocate t10_alua_tg_pt"
 536                                         "_gp_member_t\n");
 537                         return;
 538                 }
 539                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 540                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
 541                         dev->t10_alua.default_tg_pt_gp);
 542                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 543                 pr_debug("%s/%s: Adding to default ALUA Target Port"
 544                         " Group: alua/default_tg_pt_gp\n",
 545                         dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
 546         }
 547
 548         dev->dev_port_count++;
 549         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFIER */
 550 }
 551
 552 /*
 553  *      Called with struct se_device->se_port_lock spinlock held.
 554  */
 555 static void core_release_port(struct se_device *dev, struct se_port *port)
 556         __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
 557 {
 558         /*
 559          * Wait for any port reference for PR ALL_TG_PT=1 operation
 560          * to complete in __core_scsi3_alloc_registration()
 561          */
 562         spin_unlock(&dev->se_port_lock);
 563         if (atomic_read(&port->sep_tg_pt_ref_cnt))
 564                 cpu_relax();
 565         spin_lock(&dev->se_port_lock);
 566
 567         core_alua_free_tg_pt_gp_mem(port);
 568
 569         list_del(&port->sep_list);
 570         dev->dev_port_count--;
 571         kfree(port);
 572 }
 573
 574 int core_dev_export(
 575         struct se_device *dev,
 576         struct se_portal_group *tpg,
 577         struct se_lun *lun)
 578 {
 579         struct se_hba *hba = dev->se_hba;
 580         struct se_port *port;
 581
 582         port = core_alloc_port(dev);
 583         if (IS_ERR(port))
 584                 return PTR_ERR(port);
 585
 586         lun->lun_se_dev = dev;
 587
 588         spin_lock(&hba->device_lock);
 589         dev->export_count++;
 590         spin_unlock(&hba->device_lock);
 591
 592         core_export_port(dev, tpg, port, lun);
 593         return 0;
 594 }
 595
 596 void core_dev_unexport(
 597         struct se_device *dev,
 598         struct se_portal_group *tpg,
 599         struct se_lun *lun)
 600 {
 601         struct se_hba *hba = dev->se_hba;
 602         struct se_port *port = lun->lun_sep;
 603
 604         spin_lock(&lun->lun_sep_lock);
 605         if (lun->lun_se_dev == NULL) {
 606                 spin_unlock(&lun->lun_sep_lock);
 607                 return;
 608         }
 609         spin_unlock(&lun->lun_sep_lock);
 610
 611         spin_lock(&dev->se_port_lock);
 612         core_release_port(dev, port);
 613         spin_unlock(&dev->se_port_lock);
 614
 615         spin_lock(&hba->device_lock);
 616         dev->export_count--;
 617         spin_unlock(&hba->device_lock);
 618
 619         lun->lun_se_dev = NULL;
 620 }
 621
 622 static void se_release_vpd_for_dev(struct se_device *dev)
 623 {
 624         struct t10_vpd *vpd, *vpd_tmp;
 625
 626         spin_lock(&dev->t10_wwn.t10_vpd_lock);
 627         list_for_each_entry_safe(vpd, vpd_tmp,
 628                         &dev->t10_wwn.t10_vpd_list, vpd_list) {
 629                 list_del(&vpd->vpd_list);
 630                 kfree(vpd);
 631         }
 632         spin_unlock(&dev->t10_wwn.t10_vpd_lock);
 633 }
 634
 635 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 636 {
 637         u32 aligned_max_sectors;
 638         u32 alignment;
 639         /*
 640          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 641          * transport_allocate_data_tasks() operation.
 642          */
 643         alignment = max(1ul, PAGE_SIZE / block_size);
 644         aligned_max_sectors = rounddown(max_sectors, alignment);
 645
 646         if (max_sectors != aligned_max_sectors)
 647                 pr_info("Rounding down aligned max_sectors from %u to %u\n",
 648                         max_sectors, aligned_max_sectors);
 649
 650         return aligned_max_sectors;
 651 }
 652
 653 int se_dev_set_max_unmap_lba_count(
 654         struct se_device *dev,
 655         u32 max_unmap_lba_count)
 656 {
 657         dev->dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
 658         pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
 659                         dev, dev->dev_attrib.max_unmap_lba_count);
 660         return 0;
 661 }
 662
 663 int se_dev_set_max_unmap_block_desc_count(
 664         struct se_device *dev,
 665         u32 max_unmap_block_desc_count)
 666 {
 667         dev->dev_attrib.max_unmap_block_desc_count =
 668                 max_unmap_block_desc_count;
 669         pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
 670                         dev, dev->dev_attrib.max_unmap_block_desc_count);
 671         return 0;
 672 }
 673
 674 int se_dev_set_unmap_granularity(
 675         struct se_device *dev,
 676         u32 unmap_granularity)
 677 {
 678         dev->dev_attrib.unmap_granularity = unmap_granularity;
 679         pr_debug("dev[%p]: Set unmap_granularity: %u\n",
 680                         dev, dev->dev_attrib.unmap_granularity);
 681         return 0;
 682 }
 683
 684 int se_dev_set_unmap_granularity_alignment(
 685         struct se_device *dev,
 686         u32 unmap_granularity_alignment)
 687 {
 688         dev->dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
 689         pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
 690                         dev, dev->dev_attrib.unmap_granularity_alignment);
 691         return 0;
 692 }
 693
 694 int se_dev_set_max_write_same_len(
 695         struct se_device *dev,
 696         u32 max_write_same_len)
 697 {
 698         dev->dev_attrib.max_write_same_len = max_write_same_len;
 699         pr_debug("dev[%p]: Set max_write_same_len: %u\n",
 700                         dev, dev->dev_attrib.max_write_same_len);
 701         return 0;
 702 }
 703
 704 static void dev_set_t10_wwn_model_alias(struct se_device *dev)
 705 {
 706         const char *configname;
 707
 708         configname = config_item_name(&dev->dev_group.cg_item);
 709         if (strlen(configname) >= 16) {
 710                 pr_warn("dev[%p]: Backstore name '%s' is too long for "
 711                         "INQUIRY_MODEL, truncating to 16 bytes\n", dev,
 712                         configname);
 713         }
 714         snprintf(&dev->t10_wwn.model[0], 16, "%s", configname);
 715 }
 716
 717 int se_dev_set_emulate_model_alias(struct se_device *dev, int flag)
 718 {
 719         if (dev->export_count) {
 720                 pr_err("dev[%p]: Unable to change model alias"
 721                         " while export_count is %d\n",
 722                         dev, dev->export_count);
 723                         return -EINVAL;
 724         }
 725
 726         if (flag != 0 && flag != 1) {
 727                 pr_err("Illegal value %d\n", flag);
 728                 return -EINVAL;
 729         }
 730
 731         if (flag) {
 732                 dev_set_t10_wwn_model_alias(dev);
 733         } else {
 734                 strncpy(&dev->t10_wwn.model[0],
 735                         dev->transport->inquiry_prod, 16);
 736         }
 737         dev->dev_attrib.emulate_model_alias = flag;
 738
 739         return 0;
 740 }
 741
 742 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
 743 {
 744         if (flag != 0 && flag != 1) {
 745                 pr_err("Illegal value %d\n", flag);
 746                 return -EINVAL;
 747         }
 748
 749         if (flag) {
 750                 pr_err("dpo_emulated not supported\n");
 751                 return -EINVAL;
 752         }
 753
 754         return 0;
 755 }
 756
 757 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
 758 {
 759         if (flag != 0 && flag != 1) {
 760                 pr_err("Illegal value %d\n", flag);
 761                 return -EINVAL;
 762         }
 763
 764         if (flag &&
 765             dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 766                 pr_err("emulate_fua_write not supported for pSCSI\n");
 767                 return -EINVAL;
 768         }
 769         dev->dev_attrib.emulate_fua_write = flag;
 770         pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
 771                         dev, dev->dev_attrib.emulate_fua_write);
 772         return 0;
 773 }
 774
 775 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
 776 {
 777         if (flag != 0 && flag != 1) {
 778                 pr_err("Illegal value %d\n", flag);
 779                 return -EINVAL;
 780         }
 781
 782         if (flag) {
 783                 pr_err("ua read emulated not supported\n");
 784                 return -EINVAL;
 785         }
 786
 787         return 0;
 788 }
 789
 790 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
 791 {
 792         if (flag != 0 && flag != 1) {
 793                 pr_err("Illegal value %d\n", flag);
 794                 return -EINVAL;
 795         }
 796         if (flag &&
 797             dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 798                 pr_err("emulate_write_cache not supported for pSCSI\n");
 799                 return -EINVAL;
 800         }
 801         if (dev->transport->get_write_cache) {
 802                 pr_warn("emulate_write_cache cannot be changed when underlying"
 803                         " HW reports WriteCacheEnabled, ignoring request\n");
 804                 return 0;
 805         }
 806
 807         dev->dev_attrib.emulate_write_cache = flag;
 808         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
 809                         dev, dev->dev_attrib.emulate_write_cache);
 810         return 0;
 811 }
 812
 813 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
 814 {
 815         if ((flag != 0) && (flag != 1) && (flag != 2)) {
 816                 pr_err("Illegal value %d\n", flag);
 817                 return -EINVAL;
 818         }
 819
 820         if (dev->export_count) {
 821                 pr_err("dev[%p]: Unable to change SE Device"
 822                         " UA_INTRLCK_CTRL while export_count is %d\n",
 823                         dev, dev->export_count);
 824                 return -EINVAL;
 825         }
 826         dev->dev_attrib.emulate_ua_intlck_ctrl = flag;
 827         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
 828                 dev, dev->dev_attrib.emulate_ua_intlck_ctrl);
 829
 830         return 0;
 831 }
 832
 833 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
 834 {
 835         if ((flag != 0) && (flag != 1)) {
 836                 pr_err("Illegal value %d\n", flag);
 837                 return -EINVAL;
 838         }
 839
 840         if (dev->export_count) {
 841                 pr_err("dev[%p]: Unable to change SE Device TAS while"
 842                         " export_count is %d\n",
 843                         dev, dev->export_count);
 844                 return -EINVAL;
 845         }
 846         dev->dev_attrib.emulate_tas = flag;
 847         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
 848                 dev, (dev->dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
 849
 850         return 0;
 851 }
 852
 853 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
 854 {
 855         if ((flag != 0) && (flag != 1)) {
 856                 pr_err("Illegal value %d\n", flag);
 857                 return -EINVAL;
 858         }
 859         /*
 860          * We expect this value to be non-zero when generic Block Layer
 861          * Discard supported is detected iblock_create_virtdevice().
 862          */
 863         if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
 864                 pr_err("Generic Block Discard not supported\n");
 865                 return -ENOSYS;
 866         }
 867
 868         dev->dev_attrib.emulate_tpu = flag;
 869         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
 870                                 dev, flag);
 871         return 0;
 872 }
 873
 874 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
 875 {
 876         if ((flag != 0) && (flag != 1)) {
 877                 pr_err("Illegal value %d\n", flag);
 878                 return -EINVAL;
 879         }
 880         /*
 881          * We expect this value to be non-zero when generic Block Layer
 882          * Discard supported is detected iblock_create_virtdevice().
 883          */
 884         if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
 885                 pr_err("Generic Block Discard not supported\n");
 886                 return -ENOSYS;
 887         }
 888
 889         dev->dev_attrib.emulate_tpws = flag;
 890         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
 891                                 dev, flag);
 892         return 0;
 893 }
 894
 895 int se_dev_set_emulate_caw(struct se_device *dev, int flag)
 896 {
 897         if (flag != 0 && flag != 1) {
 898                 pr_err("Illegal value %d\n", flag);
 899                 return -EINVAL;
 900         }
 901         dev->dev_attrib.emulate_caw = flag;
 902         pr_debug("dev[%p]: SE Device CompareAndWrite (AtomicTestandSet): %d\n",
 903                  dev, flag);
 904
 905         return 0;
 906 }
 907
 908 int se_dev_set_emulate_3pc(struct se_device *dev, int flag)
 909 {
 910         if (flag != 0 && flag != 1) {
 911                 pr_err("Illegal value %d\n", flag);
 912                 return -EINVAL;
 913         }
 914         dev->dev_attrib.emulate_3pc = flag;
 915         pr_debug("dev[%p]: SE Device 3rd Party Copy (EXTENDED_COPY): %d\n",
 916                 dev, flag);
 917
 918         return 0;
 919 }
 920
 921 int se_dev_set_pi_prot_type(struct se_device *dev, int flag)
 922 {
 923         int rc, old_prot = dev->dev_attrib.pi_prot_type;
 924
 925         if (flag != 0 && flag != 1 && flag != 2 && flag != 3) {
 926                 pr_err("Illegal value %d for pi_prot_type\n", flag);
 927                 return -EINVAL;
 928         }
 929         if (flag == 2) {
 930                 pr_err("DIF TYPE2 protection currently not supported\n");
 931                 return -ENOSYS;
 932         }
 933         if (dev->dev_attrib.hw_pi_prot_type) {
 934                 pr_warn("DIF protection enabled on underlying hardware,"
 935                         " ignoring\n");
 936                 return 0;
 937         }
 938         if (!dev->transport->init_prot || !dev->transport->free_prot) {
 939                 pr_err("DIF protection not supported by backend: %s\n",
 940                        dev->transport->name);
 941                 return -ENOSYS;
 942         }
 943         if (!(dev->dev_flags & DF_CONFIGURED)) {
 944                 pr_err("DIF protection requires device to be configured\n");
 945                 return -ENODEV;
 946         }
 947         if (dev->export_count) {
 948                 pr_err("dev[%p]: Unable to change SE Device PROT type while"
 949                        " export_count is %d\n", dev, dev->export_count);
 950                 return -EINVAL;
 951         }
 952
 953         dev->dev_attrib.pi_prot_type = flag;
 954
 955         if (flag && !old_prot) {
 956                 rc = dev->transport->init_prot(dev);
 957                 if (rc) {
 958                         dev->dev_attrib.pi_prot_type = old_prot;
 959                         return rc;
 960                 }
 961
 962         } else if (!flag && old_prot) {
 963                 dev->transport->free_prot(dev);
 964         }
 965         pr_debug("dev[%p]: SE Device Protection Type: %d\n", dev, flag);
 966
 967         return 0;
 968 }
 969
 970 int se_dev_set_pi_prot_format(struct se_device *dev, int flag)
 971 {
 972         int rc;
 973
 974         if (!flag)
 975                 return 0;
 976
 977         if (flag != 1) {
 978                 pr_err("Illegal value %d for pi_prot_format\n", flag);
 979                 return -EINVAL;
 980         }
 981         if (!dev->transport->format_prot) {
 982                 pr_err("DIF protection format not supported by backend %s\n",
 983                        dev->transport->name);
 984                 return -ENOSYS;
 985         }
 986         if (!(dev->dev_flags & DF_CONFIGURED)) {
 987                 pr_err("DIF protection format requires device to be configured\n");
 988                 return -ENODEV;
 989         }
 990         if (dev->export_count) {
 991                 pr_err("dev[%p]: Unable to format SE Device PROT type while"
 992                        " export_count is %d\n", dev, dev->export_count);
 993                 return -EINVAL;
 994         }
 995
 996         rc = dev->transport->format_prot(dev);
 997         if (rc)
 998                 return rc;
 999
1000         pr_debug("dev[%p]: SE Device Protection Format complete\n", dev);
1001
1002         return 0;
1003 }
1004
1005 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1006 {
1007         if ((flag != 0) && (flag != 1)) {
1008                 pr_err("Illegal value %d\n", flag);
1009                 return -EINVAL;
1010         }
1011         dev->dev_attrib.enforce_pr_isids = flag;
1012         pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1013                 (dev->dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1014         return 0;
1015 }
1016
1017 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1018 {
1019         if ((flag != 0) && (flag != 1)) {
1020                 printk(KERN_ERR "Illegal value %d\n", flag);
1021                 return -EINVAL;
1022         }
1023         dev->dev_attrib.is_nonrot = flag;
1024         pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1025                dev, flag);
1026         return 0;
1027 }
1028
1029 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1030 {
1031         if (flag != 0) {
1032                 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1033                         " reordering not implemented\n", dev);
1034                 return -ENOSYS;
1035         }
1036         dev->dev_attrib.emulate_rest_reord = flag;
1037         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1038         return 0;
1039 }
1040
1041 /*
1042  * Note, this can only be called on unexported SE Device Object.
1043  */
1044 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1045 {
1046         if (dev->export_count) {
1047                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1048                         " export_count is %d\n",
1049                         dev, dev->export_count);
1050                 return -EINVAL;
1051         }
1052         if (!queue_depth) {
1053                 pr_err("dev[%p]: Illegal ZERO value for queue"
1054                         "_depth\n", dev);
1055                 return -EINVAL;
1056         }
1057
1058         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1059                 if (queue_depth > dev->dev_attrib.hw_queue_depth) {
1060                         pr_err("dev[%p]: Passed queue_depth: %u"
1061                                 " exceeds TCM/SE_Device TCQ: %u\n",
1062                                 dev, queue_depth,
1063                                 dev->dev_attrib.hw_queue_depth);
1064                         return -EINVAL;
1065                 }
1066         } else {
1067                 if (queue_depth > dev->dev_attrib.queue_depth) {
1068                         if (queue_depth > dev->dev_attrib.hw_queue_depth) {
1069                                 pr_err("dev[%p]: Passed queue_depth:"
1070                                         " %u exceeds TCM/SE_Device MAX"
1071                                         " TCQ: %u\n", dev, queue_depth,
1072                                         dev->dev_attrib.hw_queue_depth);
1073                                 return -EINVAL;
1074                         }
1075                 }
1076         }
1077
1078         dev->dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1079         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1080                         dev, queue_depth);
1081         return 0;
1082 }
1083
1084 int se_dev_set_fabric_max_sectors(struct se_device *dev, u32 fabric_max_sectors)
1085 {
1086         int block_size = dev->dev_attrib.block_size;
1087
1088         if (dev->export_count) {
1089                 pr_err("dev[%p]: Unable to change SE Device"
1090                         " fabric_max_sectors while export_count is %d\n",
1091                         dev, dev->export_count);
1092                 return -EINVAL;
1093         }
1094         if (!fabric_max_sectors) {
1095                 pr_err("dev[%p]: Illegal ZERO value for"
1096                         " fabric_max_sectors\n", dev);
1097                 return -EINVAL;
1098         }
1099         if (fabric_max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1100                 pr_err("dev[%p]: Passed fabric_max_sectors: %u less than"
1101                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, fabric_max_sectors,
1102                                 DA_STATUS_MAX_SECTORS_MIN);
1103                 return -EINVAL;
1104         }
1105         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1106                 if (fabric_max_sectors > dev->dev_attrib.hw_max_sectors) {
1107                         pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1108                                 " greater than TCM/SE_Device max_sectors:"
1109                                 " %u\n", dev, fabric_max_sectors,
1110                                 dev->dev_attrib.hw_max_sectors);
1111                          return -EINVAL;
1112                 }
1113         } else {
1114                 if (fabric_max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1115                         pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1116                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1117                                 " %u\n", dev, fabric_max_sectors,
1118                                 DA_STATUS_MAX_SECTORS_MAX);
1119                         return -EINVAL;
1120                 }
1121         }
1122         /*
1123          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1124          */
1125         if (!block_size) {
1126                 block_size = 512;
1127                 pr_warn("Defaulting to 512 for zero block_size\n");
1128         }
1129         fabric_max_sectors = se_dev_align_max_sectors(fabric_max_sectors,
1130                                                       block_size);
1131
1132         dev->dev_attrib.fabric_max_sectors = fabric_max_sectors;
1133         pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1134                         dev, fabric_max_sectors);
1135         return 0;
1136 }
1137
1138 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1139 {
1140         if (dev->export_count) {
1141                 pr_err("dev[%p]: Unable to change SE Device"
1142                         " optimal_sectors while export_count is %d\n",
1143                         dev, dev->export_count);
1144                 return -EINVAL;
1145         }
1146         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1147                 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1148                                 " changed for TCM/pSCSI\n", dev);
1149                 return -EINVAL;
1150         }
1151         if (optimal_sectors > dev->dev_attrib.fabric_max_sectors) {
1152                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1153                         " greater than fabric_max_sectors: %u\n", dev,
1154                         optimal_sectors, dev->dev_attrib.fabric_max_sectors);
1155                 return -EINVAL;
1156         }
1157
1158         dev->dev_attrib.optimal_sectors = optimal_sectors;
1159         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1160                         dev, optimal_sectors);
1161         return 0;
1162 }
1163
1164 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1165 {
1166         if (dev->export_count) {
1167                 pr_err("dev[%p]: Unable to change SE Device block_size"
1168                         " while export_count is %d\n",
1169                         dev, dev->export_count);
1170                 return -EINVAL;
1171         }
1172
1173         if ((block_size != 512) &&
1174             (block_size != 1024) &&
1175             (block_size != 2048) &&
1176             (block_size != 4096)) {
1177                 pr_err("dev[%p]: Illegal value for block_device: %u"
1178                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1179                         dev, block_size);
1180                 return -EINVAL;
1181         }
1182
1183         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1184                 pr_err("dev[%p]: Not allowed to change block_size for"
1185                         " Physical Device, use for Linux/SCSI to change"
1186                         " block_size for underlying hardware\n", dev);
1187                 return -EINVAL;
1188         }
1189
1190         dev->dev_attrib.block_size = block_size;
1191         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1192                         dev, block_size);
1193
1194         if (dev->dev_attrib.max_bytes_per_io)
1195                 dev->dev_attrib.hw_max_sectors =
1196                         dev->dev_attrib.max_bytes_per_io / block_size;
1197
1198         return 0;
1199 }
1200
1201 struct se_lun *core_dev_add_lun(
1202         struct se_portal_group *tpg,
1203         struct se_device *dev,
1204         u32 unpacked_lun)
1205 {
1206         struct se_lun *lun;
1207         int rc;
1208
1209         lun = core_tpg_alloc_lun(tpg, unpacked_lun);
1210         if (IS_ERR(lun))
1211                 return lun;
1212
1213         rc = core_tpg_add_lun(tpg, lun,
1214                                 TRANSPORT_LUNFLAGS_READ_WRITE, dev);
1215         if (rc < 0)
1216                 return ERR_PTR(rc);
1217
1218         pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1219                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1220                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1221                 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
1222         /*
1223          * Update LUN maps for dynamically added initiators when
1224          * generate_node_acl is enabled.
1225          */
1226         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1227                 struct se_node_acl *acl;
1228                 spin_lock_irq(&tpg->acl_node_lock);
1229                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1230                         if (acl->dynamic_node_acl &&
1231                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1232                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1233                                 spin_unlock_irq(&tpg->acl_node_lock);
1234                                 core_tpg_add_node_to_devs(acl, tpg);
1235                                 spin_lock_irq(&tpg->acl_node_lock);
1236                         }
1237                 }
1238                 spin_unlock_irq(&tpg->acl_node_lock);
1239         }
1240
1241         return lun;
1242 }
1243
1244 /*      core_dev_del_lun():
1245  *
1246  *
1247  */
1248 int core_dev_del_lun(
1249         struct se_portal_group *tpg,
1250         u32 unpacked_lun)
1251 {
1252         struct se_lun *lun;
1253
1254         lun = core_tpg_pre_dellun(tpg, unpacked_lun);
1255         if (IS_ERR(lun))
1256                 return PTR_ERR(lun);
1257
1258         core_tpg_post_dellun(tpg, lun);
1259
1260         pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1261                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1262                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1263                 tpg->se_tpg_tfo->get_fabric_name());
1264
1265         return 0;
1266 }
1267
1268 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1269 {
1270         struct se_lun *lun;
1271
1272         spin_lock(&tpg->tpg_lun_lock);
1273         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1274                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1275                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1276                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1277                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1278                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1279                 spin_unlock(&tpg->tpg_lun_lock);
1280                 return NULL;
1281         }
1282         lun = tpg->tpg_lun_list[unpacked_lun];
1283
1284         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1285                 pr_err("%s Logical Unit Number: %u is not free on"
1286                         " Target Portal Group: %hu, ignoring request.\n",
1287                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1288                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1289                 spin_unlock(&tpg->tpg_lun_lock);
1290                 return NULL;
1291         }
1292         spin_unlock(&tpg->tpg_lun_lock);
1293
1294         return lun;
1295 }
1296
1297 /*      core_dev_get_lun():
1298  *
1299  *
1300  */
1301 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1302 {
1303         struct se_lun *lun;
1304
1305         spin_lock(&tpg->tpg_lun_lock);
1306         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1307                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1308                         "_TPG-1: %u for Target Portal Group: %hu\n",
1309                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1310                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1311                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1312                 spin_unlock(&tpg->tpg_lun_lock);
1313                 return NULL;
1314         }
1315         lun = tpg->tpg_lun_list[unpacked_lun];
1316
1317         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1318                 pr_err("%s Logical Unit Number: %u is not active on"
1319                         " Target Portal Group: %hu, ignoring request.\n",
1320                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1321                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1322                 spin_unlock(&tpg->tpg_lun_lock);
1323                 return NULL;
1324         }
1325         spin_unlock(&tpg->tpg_lun_lock);
1326
1327         return lun;
1328 }
1329
1330 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1331         struct se_portal_group *tpg,
1332         struct se_node_acl *nacl,
1333         u32 mapped_lun,
1334         int *ret)
1335 {
1336         struct se_lun_acl *lacl;
1337
1338         if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
1339                 pr_err("%s InitiatorName exceeds maximum size.\n",
1340                         tpg->se_tpg_tfo->get_fabric_name());
1341                 *ret = -EOVERFLOW;
1342                 return NULL;
1343         }
1344         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1345         if (!lacl) {
1346                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1347                 *ret = -ENOMEM;
1348                 return NULL;
1349         }
1350
1351         INIT_LIST_HEAD(&lacl->lacl_list);
1352         lacl->mapped_lun = mapped_lun;
1353         lacl->se_lun_nacl = nacl;
1354         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s",
1355                  nacl->initiatorname);
1356
1357         return lacl;
1358 }
1359
1360 int core_dev_add_initiator_node_lun_acl(
1361         struct se_portal_group *tpg,
1362         struct se_lun_acl *lacl,
1363         u32 unpacked_lun,
1364         u32 lun_access)
1365 {
1366         struct se_lun *lun;
1367         struct se_node_acl *nacl;
1368
1369         lun = core_dev_get_lun(tpg, unpacked_lun);
1370         if (!lun) {
1371                 pr_err("%s Logical Unit Number: %u is not active on"
1372                         " Target Portal Group: %hu, ignoring request.\n",
1373                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1374                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1375                 return -EINVAL;
1376         }
1377
1378         nacl = lacl->se_lun_nacl;
1379         if (!nacl)
1380                 return -EINVAL;
1381
1382         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1383             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1384                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1385
1386         lacl->se_lun = lun;
1387
1388         if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
1389                         lun_access, nacl, tpg) < 0)
1390                 return -EINVAL;
1391
1392         spin_lock(&lun->lun_acl_lock);
1393         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1394         atomic_inc(&lun->lun_acl_count);
1395         smp_mb__after_atomic_inc();
1396         spin_unlock(&lun->lun_acl_lock);
1397
1398         pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1399                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1400                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1401                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1402                 lacl->initiatorname);
1403         /*
1404          * Check to see if there are any existing persistent reservation APTPL
1405          * pre-registrations that need to be enabled for this LUN ACL..
1406          */
1407         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1408         return 0;
1409 }
1410
1411 /*      core_dev_del_initiator_node_lun_acl():
1412  *
1413  *
1414  */
1415 int core_dev_del_initiator_node_lun_acl(
1416         struct se_portal_group *tpg,
1417         struct se_lun *lun,
1418         struct se_lun_acl *lacl)
1419 {
1420         struct se_node_acl *nacl;
1421
1422         nacl = lacl->se_lun_nacl;
1423         if (!nacl)
1424                 return -EINVAL;
1425
1426         spin_lock(&lun->lun_acl_lock);
1427         list_del(&lacl->lacl_list);
1428         atomic_dec(&lun->lun_acl_count);
1429         smp_mb__after_atomic_dec();
1430         spin_unlock(&lun->lun_acl_lock);
1431
1432         core_disable_device_list_for_node(lun, NULL, lacl->mapped_lun,
1433                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
1434
1435         lacl->se_lun = NULL;
1436
1437         pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1438                 " InitiatorNode: %s Mapped LUN: %u\n",
1439                 tpg->se_tpg_tfo->get_fabric_name(),
1440                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1441                 lacl->initiatorname, lacl->mapped_lun);
1442
1443         return 0;
1444 }
1445
1446 void core_dev_free_initiator_node_lun_acl(
1447         struct se_portal_group *tpg,
1448         struct se_lun_acl *lacl)
1449 {
1450         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1451                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1452                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1453                 tpg->se_tpg_tfo->get_fabric_name(),
1454                 lacl->initiatorname, lacl->mapped_lun);
1455
1456         kfree(lacl);
1457 }
1458
1459 static void scsi_dump_inquiry(struct se_device *dev)
1460 {
1461         struct t10_wwn *wwn = &dev->t10_wwn;
1462         char buf[17];
1463         int i, device_type;
1464         /*
1465          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1466          */
1467         for (i = 0; i < 8; i++)
1468                 if (wwn->vendor[i] >= 0x20)
1469                         buf[i] = wwn->vendor[i];
1470                 else
1471                         buf[i] = ' ';
1472         buf[i] = '\0';
1473         pr_debug("  Vendor: %s\n", buf);
1474
1475         for (i = 0; i < 16; i++)
1476                 if (wwn->model[i] >= 0x20)
1477                         buf[i] = wwn->model[i];
1478                 else
1479                         buf[i] = ' ';
1480         buf[i] = '\0';
1481         pr_debug("  Model: %s\n", buf);
1482
1483         for (i = 0; i < 4; i++)
1484                 if (wwn->revision[i] >= 0x20)
1485                         buf[i] = wwn->revision[i];
1486                 else
1487                         buf[i] = ' ';
1488         buf[i] = '\0';
1489         pr_debug("  Revision: %s\n", buf);
1490
1491         device_type = dev->transport->get_device_type(dev);
1492         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1493 }
1494
1495 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
1496 {
1497         struct se_device *dev;
1498         struct se_lun *xcopy_lun;
1499
1500         dev = hba->transport->alloc_device(hba, name);
1501         if (!dev)
1502                 return NULL;
1503
1504         dev->dev_link_magic = SE_DEV_LINK_MAGIC;
1505         dev->se_hba = hba;
1506         dev->transport = hba->transport;
1507         dev->prot_length = sizeof(struct se_dif_v1_tuple);
1508
1509         INIT_LIST_HEAD(&dev->dev_list);
1510         INIT_LIST_HEAD(&dev->dev_sep_list);
1511         INIT_LIST_HEAD(&dev->dev_tmr_list);
1512         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1513         INIT_LIST_HEAD(&dev->state_list);
1514         INIT_LIST_HEAD(&dev->qf_cmd_list);
1515         INIT_LIST_HEAD(&dev->g_dev_node);
1516         spin_lock_init(&dev->execute_task_lock);
1517         spin_lock_init(&dev->delayed_cmd_lock);
1518         spin_lock_init(&dev->dev_reservation_lock);
1519         spin_lock_init(&dev->se_port_lock);
1520         spin_lock_init(&dev->se_tmr_lock);
1521         spin_lock_init(&dev->qf_cmd_lock);
1522         sema_init(&dev->caw_sem, 1);
1523         atomic_set(&dev->dev_ordered_id, 0);
1524         INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
1525         spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
1526         INIT_LIST_HEAD(&dev->t10_pr.registration_list);
1527         INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
1528         spin_lock_init(&dev->t10_pr.registration_lock);
1529         spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
1530         INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
1531         spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
1532         INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
1533         spin_lock_init(&dev->t10_alua.lba_map_lock);
1534
1535         dev->t10_wwn.t10_dev = dev;
1536         dev->t10_alua.t10_dev = dev;
1537
1538         dev->dev_attrib.da_dev = dev;
1539         dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
1540         dev->dev_attrib.emulate_dpo = DA_EMULATE_DPO;
1541         dev->dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
1542         dev->dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
1543         dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
1544         dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
1545         dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
1546         dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
1547         dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
1548         dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
1549         dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
1550         dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
1551         dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
1552         dev->dev_attrib.is_nonrot = DA_IS_NONROT;
1553         dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
1554         dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
1555         dev->dev_attrib.max_unmap_block_desc_count =
1556                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
1557         dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
1558         dev->dev_attrib.unmap_granularity_alignment =
1559                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
1560         dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
1561         dev->dev_attrib.fabric_max_sectors = DA_FABRIC_MAX_SECTORS;
1562         dev->dev_attrib.optimal_sectors = DA_FABRIC_MAX_SECTORS;
1563
1564         xcopy_lun = &dev->xcopy_lun;
1565         xcopy_lun->lun_se_dev = dev;
1566         init_completion(&xcopy_lun->lun_shutdown_comp);
1567         INIT_LIST_HEAD(&xcopy_lun->lun_acl_list);
1568         spin_lock_init(&xcopy_lun->lun_acl_lock);
1569         spin_lock_init(&xcopy_lun->lun_sep_lock);
1570         init_completion(&xcopy_lun->lun_ref_comp);
1571
1572         return dev;
1573 }
1574
1575 int target_configure_device(struct se_device *dev)
1576 {
1577         struct se_hba *hba = dev->se_hba;
1578         int ret;
1579
1580         if (dev->dev_flags & DF_CONFIGURED) {
1581                 pr_err("se_dev->se_dev_ptr already set for storage"
1582                                 " object\n");
1583                 return -EEXIST;
1584         }
1585
1586         ret = dev->transport->configure_device(dev);
1587         if (ret)
1588                 goto out;
1589         dev->dev_flags |= DF_CONFIGURED;
1590
1591         /*
1592          * XXX: there is not much point to have two different values here..
1593          */
1594         dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
1595         dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
1596
1597         /*
1598          * Align max_hw_sectors down to PAGE_SIZE I/O transfers
1599          */
1600         dev->dev_attrib.hw_max_sectors =
1601                 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
1602                                          dev->dev_attrib.hw_block_size);
1603
1604         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1605         dev->creation_time = get_jiffies_64();
1606
1607         ret = core_setup_alua(dev);
1608         if (ret)
1609                 goto out;
1610
1611         /*
1612          * Startup the struct se_device processing thread
1613          */
1614         dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1615                                       dev->transport->name);
1616         if (!dev->tmr_wq) {
1617                 pr_err("Unable to create tmr workqueue for %s\n",
1618                         dev->transport->name);
1619                 ret = -ENOMEM;
1620                 goto out_free_alua;
1621         }
1622
1623         /*
1624          * Setup work_queue for QUEUE_FULL
1625          */
1626         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1627
1628         /*
1629          * Preload the initial INQUIRY const values if we are doing
1630          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1631          * passthrough because this is being provided by the backend LLD.
1632          */
1633         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1634                 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1635                 strncpy(&dev->t10_wwn.model[0],
1636                         dev->transport->inquiry_prod, 16);
1637                 strncpy(&dev->t10_wwn.revision[0],
1638                         dev->transport->inquiry_rev, 4);
1639         }
1640
1641         scsi_dump_inquiry(dev);
1642
1643         spin_lock(&hba->device_lock);
1644         hba->dev_count++;
1645         spin_unlock(&hba->device_lock);
1646
1647         mutex_lock(&g_device_mutex);
1648         list_add_tail(&dev->g_dev_node, &g_device_list);
1649         mutex_unlock(&g_device_mutex);
1650
1651         return 0;
1652
1653 out_free_alua:
1654         core_alua_free_lu_gp_mem(dev);
1655 out:
1656         se_release_vpd_for_dev(dev);
1657         return ret;
1658 }
1659
1660 void target_free_device(struct se_device *dev)
1661 {
1662         struct se_hba *hba = dev->se_hba;
1663
1664         WARN_ON(!list_empty(&dev->dev_sep_list));
1665
1666         if (dev->dev_flags & DF_CONFIGURED) {
1667                 destroy_workqueue(dev->tmr_wq);
1668
1669                 mutex_lock(&g_device_mutex);
1670                 list_del(&dev->g_dev_node);
1671                 mutex_unlock(&g_device_mutex);
1672
1673                 spin_lock(&hba->device_lock);
1674                 hba->dev_count--;
1675                 spin_unlock(&hba->device_lock);
1676         }
1677
1678         core_alua_free_lu_gp_mem(dev);
1679         core_alua_set_lba_map(dev, NULL, 0, 0);
1680         core_scsi3_free_all_registrations(dev);
1681         se_release_vpd_for_dev(dev);
1682
1683         if (dev->transport->free_prot)
1684                 dev->transport->free_prot(dev);
1685
1686         dev->transport->free_device(dev);
1687 }
1688
1689 int core_dev_setup_virtual_lun0(void)
1690 {
1691         struct se_hba *hba;
1692         struct se_device *dev;
1693         char buf[] = "rd_pages=8,rd_nullio=1";
1694         int ret;
1695
1696         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1697         if (IS_ERR(hba))
1698                 return PTR_ERR(hba);
1699
1700         dev = target_alloc_device(hba, "virt_lun0");
1701         if (!dev) {
1702                 ret = -ENOMEM;
1703                 goto out_free_hba;
1704         }
1705
1706         hba->transport->set_configfs_dev_params(dev, buf, sizeof(buf));
1707
1708         ret = target_configure_device(dev);
1709         if (ret)
1710                 goto out_free_se_dev;
1711
1712         lun0_hba = hba;
1713         g_lun0_dev = dev;
1714         return 0;
1715
1716 out_free_se_dev:
1717         target_free_device(dev);
1718 out_free_hba:
1719         core_delete_hba(hba);
1720         return ret;
1721 }
1722
1723
1724 void core_dev_release_virtual_lun0(void)
1725 {
1726         struct se_hba *hba = lun0_hba;
1727
1728         if (!hba)
1729                 return;
1730
1731         if (g_lun0_dev)
1732                 target_free_device(g_lun0_dev);
1733         core_delete_hba(hba);
1734 }