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();
 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_sep = NULL;
 620         lun->lun_se_dev = NULL;
 621 }
 622
 623 static void se_release_vpd_for_dev(struct se_device *dev)
 624 {
 625         struct t10_vpd *vpd, *vpd_tmp;
 626
 627         spin_lock(&dev->t10_wwn.t10_vpd_lock);
 628         list_for_each_entry_safe(vpd, vpd_tmp,
 629                         &dev->t10_wwn.t10_vpd_list, vpd_list) {
 630                 list_del(&vpd->vpd_list);
 631                 kfree(vpd);
 632         }
 633         spin_unlock(&dev->t10_wwn.t10_vpd_lock);
 634 }
 635
 636 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 637 {
 638         u32 aligned_max_sectors;
 639         u32 alignment;
 640         /*
 641          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 642          * transport_allocate_data_tasks() operation.
 643          */
 644         alignment = max(1ul, PAGE_SIZE / block_size);
 645         aligned_max_sectors = rounddown(max_sectors, alignment);
 646
 647         if (max_sectors != aligned_max_sectors)
 648                 pr_info("Rounding down aligned max_sectors from %u to %u\n",
 649                         max_sectors, aligned_max_sectors);
 650
 651         return aligned_max_sectors;
 652 }
 653
 654 int se_dev_set_max_unmap_lba_count(
 655         struct se_device *dev,
 656         u32 max_unmap_lba_count)
 657 {
 658         dev->dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
 659         pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
 660                         dev, dev->dev_attrib.max_unmap_lba_count);
 661         return 0;
 662 }
 663
 664 int se_dev_set_max_unmap_block_desc_count(
 665         struct se_device *dev,
 666         u32 max_unmap_block_desc_count)
 667 {
 668         dev->dev_attrib.max_unmap_block_desc_count =
 669                 max_unmap_block_desc_count;
 670         pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
 671                         dev, dev->dev_attrib.max_unmap_block_desc_count);
 672         return 0;
 673 }
 674
 675 int se_dev_set_unmap_granularity(
 676         struct se_device *dev,
 677         u32 unmap_granularity)
 678 {
 679         dev->dev_attrib.unmap_granularity = unmap_granularity;
 680         pr_debug("dev[%p]: Set unmap_granularity: %u\n",
 681                         dev, dev->dev_attrib.unmap_granularity);
 682         return 0;
 683 }
 684
 685 int se_dev_set_unmap_granularity_alignment(
 686         struct se_device *dev,
 687         u32 unmap_granularity_alignment)
 688 {
 689         dev->dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
 690         pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
 691                         dev, dev->dev_attrib.unmap_granularity_alignment);
 692         return 0;
 693 }
 694
 695 int se_dev_set_max_write_same_len(
 696         struct se_device *dev,
 697         u32 max_write_same_len)
 698 {
 699         dev->dev_attrib.max_write_same_len = max_write_same_len;
 700         pr_debug("dev[%p]: Set max_write_same_len: %u\n",
 701                         dev, dev->dev_attrib.max_write_same_len);
 702         return 0;
 703 }
 704
 705 static void dev_set_t10_wwn_model_alias(struct se_device *dev)
 706 {
 707         const char *configname;
 708
 709         configname = config_item_name(&dev->dev_group.cg_item);
 710         if (strlen(configname) >= 16) {
 711                 pr_warn("dev[%p]: Backstore name '%s' is too long for "
 712                         "INQUIRY_MODEL, truncating to 16 bytes\n", dev,
 713                         configname);
 714         }
 715         snprintf(&dev->t10_wwn.model[0], 16, "%s", configname);
 716 }
 717
 718 int se_dev_set_emulate_model_alias(struct se_device *dev, int flag)
 719 {
 720         if (dev->export_count) {
 721                 pr_err("dev[%p]: Unable to change model alias"
 722                         " while export_count is %d\n",
 723                         dev, dev->export_count);
 724                         return -EINVAL;
 725         }
 726
 727         if (flag != 0 && flag != 1) {
 728                 pr_err("Illegal value %d\n", flag);
 729                 return -EINVAL;
 730         }
 731
 732         if (flag) {
 733                 dev_set_t10_wwn_model_alias(dev);
 734         } else {
 735                 strncpy(&dev->t10_wwn.model[0],
 736                         dev->transport->inquiry_prod, 16);
 737         }
 738         dev->dev_attrib.emulate_model_alias = flag;
 739
 740         return 0;
 741 }
 742
 743 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
 744 {
 745         if (flag != 0 && flag != 1) {
 746                 pr_err("Illegal value %d\n", flag);
 747                 return -EINVAL;
 748         }
 749
 750         if (flag) {
 751                 pr_err("dpo_emulated not supported\n");
 752                 return -EINVAL;
 753         }
 754
 755         return 0;
 756 }
 757
 758 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
 759 {
 760         if (flag != 0 && flag != 1) {
 761                 pr_err("Illegal value %d\n", flag);
 762                 return -EINVAL;
 763         }
 764
 765         if (flag &&
 766             dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 767                 pr_err("emulate_fua_write not supported for pSCSI\n");
 768                 return -EINVAL;
 769         }
 770         dev->dev_attrib.emulate_fua_write = flag;
 771         pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
 772                         dev, dev->dev_attrib.emulate_fua_write);
 773         return 0;
 774 }
 775
 776 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
 777 {
 778         if (flag != 0 && flag != 1) {
 779                 pr_err("Illegal value %d\n", flag);
 780                 return -EINVAL;
 781         }
 782
 783         if (flag) {
 784                 pr_err("ua read emulated not supported\n");
 785                 return -EINVAL;
 786         }
 787
 788         return 0;
 789 }
 790
 791 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
 792 {
 793         if (flag != 0 && flag != 1) {
 794                 pr_err("Illegal value %d\n", flag);
 795                 return -EINVAL;
 796         }
 797         if (flag &&
 798             dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 799                 pr_err("emulate_write_cache not supported for pSCSI\n");
 800                 return -EINVAL;
 801         }
 802         if (flag &&
 803             dev->transport->get_write_cache) {
 804                 pr_err("emulate_write_cache not supported for this device\n");
 805                 return -EINVAL;
 806         }
 807
 808         dev->dev_attrib.emulate_write_cache = flag;
 809         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
 810                         dev, dev->dev_attrib.emulate_write_cache);
 811         return 0;
 812 }
 813
 814 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
 815 {
 816         if ((flag != 0) && (flag != 1) && (flag != 2)) {
 817                 pr_err("Illegal value %d\n", flag);
 818                 return -EINVAL;
 819         }
 820
 821         if (dev->export_count) {
 822                 pr_err("dev[%p]: Unable to change SE Device"
 823                         " UA_INTRLCK_CTRL while export_count is %d\n",
 824                         dev, dev->export_count);
 825                 return -EINVAL;
 826         }
 827         dev->dev_attrib.emulate_ua_intlck_ctrl = flag;
 828         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
 829                 dev, dev->dev_attrib.emulate_ua_intlck_ctrl);
 830
 831         return 0;
 832 }
 833
 834 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
 835 {
 836         if ((flag != 0) && (flag != 1)) {
 837                 pr_err("Illegal value %d\n", flag);
 838                 return -EINVAL;
 839         }
 840
 841         if (dev->export_count) {
 842                 pr_err("dev[%p]: Unable to change SE Device TAS while"
 843                         " export_count is %d\n",
 844                         dev, dev->export_count);
 845                 return -EINVAL;
 846         }
 847         dev->dev_attrib.emulate_tas = flag;
 848         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
 849                 dev, (dev->dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
 850
 851         return 0;
 852 }
 853
 854 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
 855 {
 856         if ((flag != 0) && (flag != 1)) {
 857                 pr_err("Illegal value %d\n", flag);
 858                 return -EINVAL;
 859         }
 860         /*
 861          * We expect this value to be non-zero when generic Block Layer
 862          * Discard supported is detected iblock_create_virtdevice().
 863          */
 864         if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
 865                 pr_err("Generic Block Discard not supported\n");
 866                 return -ENOSYS;
 867         }
 868
 869         dev->dev_attrib.emulate_tpu = flag;
 870         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
 871                                 dev, flag);
 872         return 0;
 873 }
 874
 875 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
 876 {
 877         if ((flag != 0) && (flag != 1)) {
 878                 pr_err("Illegal value %d\n", flag);
 879                 return -EINVAL;
 880         }
 881         /*
 882          * We expect this value to be non-zero when generic Block Layer
 883          * Discard supported is detected iblock_create_virtdevice().
 884          */
 885         if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
 886                 pr_err("Generic Block Discard not supported\n");
 887                 return -ENOSYS;
 888         }
 889
 890         dev->dev_attrib.emulate_tpws = flag;
 891         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
 892                                 dev, flag);
 893         return 0;
 894 }
 895
 896 int se_dev_set_emulate_caw(struct se_device *dev, int flag)
 897 {
 898         if (flag != 0 && flag != 1) {
 899                 pr_err("Illegal value %d\n", flag);
 900                 return -EINVAL;
 901         }
 902         dev->dev_attrib.emulate_caw = flag;
 903         pr_debug("dev[%p]: SE Device CompareAndWrite (AtomicTestandSet): %d\n",
 904                  dev, flag);
 905
 906         return 0;
 907 }
 908
 909 int se_dev_set_emulate_3pc(struct se_device *dev, int flag)
 910 {
 911         if (flag != 0 && flag != 1) {
 912                 pr_err("Illegal value %d\n", flag);
 913                 return -EINVAL;
 914         }
 915         dev->dev_attrib.emulate_3pc = flag;
 916         pr_debug("dev[%p]: SE Device 3rd Party Copy (EXTENDED_COPY): %d\n",
 917                 dev, flag);
 918
 919         return 0;
 920 }
 921
 922 int se_dev_set_pi_prot_type(struct se_device *dev, int flag)
 923 {
 924         int rc, old_prot = dev->dev_attrib.pi_prot_type;
 925
 926         if (flag != 0 && flag != 1 && flag != 2 && flag != 3) {
 927                 pr_err("Illegal value %d for pi_prot_type\n", flag);
 928                 return -EINVAL;
 929         }
 930         if (flag == 2) {
 931                 pr_err("DIF TYPE2 protection currently not supported\n");
 932                 return -ENOSYS;
 933         }
 934         if (dev->dev_attrib.hw_pi_prot_type) {
 935                 pr_warn("DIF protection enabled on underlying hardware,"
 936                         " ignoring\n");
 937                 return 0;
 938         }
 939         if (!dev->transport->init_prot || !dev->transport->free_prot) {
 940                 /* 0 is only allowed value for non-supporting backends */
 941                 if (flag == 0)
 942                         return 0;
 943
 944                 pr_err("DIF protection not supported by backend: %s\n",
 945                        dev->transport->name);
 946                 return -ENOSYS;
 947         }
 948         if (!(dev->dev_flags & DF_CONFIGURED)) {
 949                 pr_err("DIF protection requires device to be configured\n");
 950                 return -ENODEV;
 951         }
 952         if (dev->export_count) {
 953                 pr_err("dev[%p]: Unable to change SE Device PROT type while"
 954                        " export_count is %d\n", dev, dev->export_count);
 955                 return -EINVAL;
 956         }
 957
 958         dev->dev_attrib.pi_prot_type = flag;
 959
 960         if (flag && !old_prot) {
 961                 rc = dev->transport->init_prot(dev);
 962                 if (rc) {
 963                         dev->dev_attrib.pi_prot_type = old_prot;
 964                         return rc;
 965                 }
 966
 967         } else if (!flag && old_prot) {
 968                 dev->transport->free_prot(dev);
 969         }
 970         pr_debug("dev[%p]: SE Device Protection Type: %d\n", dev, flag);
 971
 972         return 0;
 973 }
 974
 975 int se_dev_set_pi_prot_format(struct se_device *dev, int flag)
 976 {
 977         int rc;
 978
 979         if (!flag)
 980                 return 0;
 981
 982         if (flag != 1) {
 983                 pr_err("Illegal value %d for pi_prot_format\n", flag);
 984                 return -EINVAL;
 985         }
 986         if (!dev->transport->format_prot) {
 987                 pr_err("DIF protection format not supported by backend %s\n",
 988                        dev->transport->name);
 989                 return -ENOSYS;
 990         }
 991         if (!(dev->dev_flags & DF_CONFIGURED)) {
 992                 pr_err("DIF protection format requires device to be configured\n");
 993                 return -ENODEV;
 994         }
 995         if (dev->export_count) {
 996                 pr_err("dev[%p]: Unable to format SE Device PROT type while"
 997                        " export_count is %d\n", dev, dev->export_count);
 998                 return -EINVAL;
 999         }
1000
1001         rc = dev->transport->format_prot(dev);
1002         if (rc)
1003                 return rc;
1004
1005         pr_debug("dev[%p]: SE Device Protection Format complete\n", dev);
1006
1007         return 0;
1008 }
1009
1010 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1011 {
1012         if ((flag != 0) && (flag != 1)) {
1013                 pr_err("Illegal value %d\n", flag);
1014                 return -EINVAL;
1015         }
1016         dev->dev_attrib.enforce_pr_isids = flag;
1017         pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1018                 (dev->dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1019         return 0;
1020 }
1021
1022 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1023 {
1024         if ((flag != 0) && (flag != 1)) {
1025                 printk(KERN_ERR "Illegal value %d\n", flag);
1026                 return -EINVAL;
1027         }
1028         dev->dev_attrib.is_nonrot = flag;
1029         pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1030                dev, flag);
1031         return 0;
1032 }
1033
1034 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1035 {
1036         if (flag != 0) {
1037                 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1038                         " reordering not implemented\n", dev);
1039                 return -ENOSYS;
1040         }
1041         dev->dev_attrib.emulate_rest_reord = flag;
1042         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1043         return 0;
1044 }
1045
1046 /*
1047  * Note, this can only be called on unexported SE Device Object.
1048  */
1049 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1050 {
1051         if (dev->export_count) {
1052                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1053                         " export_count is %d\n",
1054                         dev, dev->export_count);
1055                 return -EINVAL;
1056         }
1057         if (!queue_depth) {
1058                 pr_err("dev[%p]: Illegal ZERO value for queue"
1059                         "_depth\n", dev);
1060                 return -EINVAL;
1061         }
1062
1063         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1064                 if (queue_depth > dev->dev_attrib.hw_queue_depth) {
1065                         pr_err("dev[%p]: Passed queue_depth: %u"
1066                                 " exceeds TCM/SE_Device TCQ: %u\n",
1067                                 dev, queue_depth,
1068                                 dev->dev_attrib.hw_queue_depth);
1069                         return -EINVAL;
1070                 }
1071         } else {
1072                 if (queue_depth > dev->dev_attrib.queue_depth) {
1073                         if (queue_depth > dev->dev_attrib.hw_queue_depth) {
1074                                 pr_err("dev[%p]: Passed queue_depth:"
1075                                         " %u exceeds TCM/SE_Device MAX"
1076                                         " TCQ: %u\n", dev, queue_depth,
1077                                         dev->dev_attrib.hw_queue_depth);
1078                                 return -EINVAL;
1079                         }
1080                 }
1081         }
1082
1083         dev->dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1084         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1085                         dev, queue_depth);
1086         return 0;
1087 }
1088
1089 int se_dev_set_fabric_max_sectors(struct se_device *dev, u32 fabric_max_sectors)
1090 {
1091         int block_size = dev->dev_attrib.block_size;
1092
1093         if (dev->export_count) {
1094                 pr_err("dev[%p]: Unable to change SE Device"
1095                         " fabric_max_sectors while export_count is %d\n",
1096                         dev, dev->export_count);
1097                 return -EINVAL;
1098         }
1099         if (!fabric_max_sectors) {
1100                 pr_err("dev[%p]: Illegal ZERO value for"
1101                         " fabric_max_sectors\n", dev);
1102                 return -EINVAL;
1103         }
1104         if (fabric_max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1105                 pr_err("dev[%p]: Passed fabric_max_sectors: %u less than"
1106                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, fabric_max_sectors,
1107                                 DA_STATUS_MAX_SECTORS_MIN);
1108                 return -EINVAL;
1109         }
1110         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1111                 if (fabric_max_sectors > dev->dev_attrib.hw_max_sectors) {
1112                         pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1113                                 " greater than TCM/SE_Device max_sectors:"
1114                                 " %u\n", dev, fabric_max_sectors,
1115                                 dev->dev_attrib.hw_max_sectors);
1116                          return -EINVAL;
1117                 }
1118         } else {
1119                 if (fabric_max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1120                         pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1121                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1122                                 " %u\n", dev, fabric_max_sectors,
1123                                 DA_STATUS_MAX_SECTORS_MAX);
1124                         return -EINVAL;
1125                 }
1126         }
1127         /*
1128          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1129          */
1130         if (!block_size) {
1131                 block_size = 512;
1132                 pr_warn("Defaulting to 512 for zero block_size\n");
1133         }
1134         fabric_max_sectors = se_dev_align_max_sectors(fabric_max_sectors,
1135                                                       block_size);
1136
1137         dev->dev_attrib.fabric_max_sectors = fabric_max_sectors;
1138         pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1139                         dev, fabric_max_sectors);
1140         return 0;
1141 }
1142
1143 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1144 {
1145         if (dev->export_count) {
1146                 pr_err("dev[%p]: Unable to change SE Device"
1147                         " optimal_sectors while export_count is %d\n",
1148                         dev, dev->export_count);
1149                 return -EINVAL;
1150         }
1151         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1152                 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1153                                 " changed for TCM/pSCSI\n", dev);
1154                 return -EINVAL;
1155         }
1156         if (optimal_sectors > dev->dev_attrib.fabric_max_sectors) {
1157                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1158                         " greater than fabric_max_sectors: %u\n", dev,
1159                         optimal_sectors, dev->dev_attrib.fabric_max_sectors);
1160                 return -EINVAL;
1161         }
1162
1163         dev->dev_attrib.optimal_sectors = optimal_sectors;
1164         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1165                         dev, optimal_sectors);
1166         return 0;
1167 }
1168
1169 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1170 {
1171         if (dev->export_count) {
1172                 pr_err("dev[%p]: Unable to change SE Device block_size"
1173                         " while export_count is %d\n",
1174                         dev, dev->export_count);
1175                 return -EINVAL;
1176         }
1177
1178         if ((block_size != 512) &&
1179             (block_size != 1024) &&
1180             (block_size != 2048) &&
1181             (block_size != 4096)) {
1182                 pr_err("dev[%p]: Illegal value for block_device: %u"
1183                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1184                         dev, block_size);
1185                 return -EINVAL;
1186         }
1187
1188         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1189                 pr_err("dev[%p]: Not allowed to change block_size for"
1190                         " Physical Device, use for Linux/SCSI to change"
1191                         " block_size for underlying hardware\n", dev);
1192                 return -EINVAL;
1193         }
1194
1195         dev->dev_attrib.block_size = block_size;
1196         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1197                         dev, block_size);
1198
1199         if (dev->dev_attrib.max_bytes_per_io)
1200                 dev->dev_attrib.hw_max_sectors =
1201                         dev->dev_attrib.max_bytes_per_io / block_size;
1202
1203         return 0;
1204 }
1205
1206 struct se_lun *core_dev_add_lun(
1207         struct se_portal_group *tpg,
1208         struct se_device *dev,
1209         u32 unpacked_lun)
1210 {
1211         struct se_lun *lun;
1212         int rc;
1213
1214         lun = core_tpg_alloc_lun(tpg, unpacked_lun);
1215         if (IS_ERR(lun))
1216                 return lun;
1217
1218         rc = core_tpg_add_lun(tpg, lun,
1219                                 TRANSPORT_LUNFLAGS_READ_WRITE, dev);
1220         if (rc < 0)
1221                 return ERR_PTR(rc);
1222
1223         pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1224                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1225                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1226                 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
1227         /*
1228          * Update LUN maps for dynamically added initiators when
1229          * generate_node_acl is enabled.
1230          */
1231         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1232                 struct se_node_acl *acl;
1233                 spin_lock_irq(&tpg->acl_node_lock);
1234                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1235                         if (acl->dynamic_node_acl &&
1236                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1237                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1238                                 spin_unlock_irq(&tpg->acl_node_lock);
1239                                 core_tpg_add_node_to_devs(acl, tpg);
1240                                 spin_lock_irq(&tpg->acl_node_lock);
1241                         }
1242                 }
1243                 spin_unlock_irq(&tpg->acl_node_lock);
1244         }
1245
1246         return lun;
1247 }
1248
1249 /*      core_dev_del_lun():
1250  *
1251  *
1252  */
1253 int core_dev_del_lun(
1254         struct se_portal_group *tpg,
1255         u32 unpacked_lun)
1256 {
1257         struct se_lun *lun;
1258
1259         lun = core_tpg_pre_dellun(tpg, unpacked_lun);
1260         if (IS_ERR(lun))
1261                 return PTR_ERR(lun);
1262
1263         core_tpg_post_dellun(tpg, lun);
1264
1265         pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1266                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1267                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1268                 tpg->se_tpg_tfo->get_fabric_name());
1269
1270         return 0;
1271 }
1272
1273 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1274 {
1275         struct se_lun *lun;
1276
1277         spin_lock(&tpg->tpg_lun_lock);
1278         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1279                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1280                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1281                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1282                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1283                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1284                 spin_unlock(&tpg->tpg_lun_lock);
1285                 return NULL;
1286         }
1287         lun = tpg->tpg_lun_list[unpacked_lun];
1288
1289         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1290                 pr_err("%s Logical Unit Number: %u is not free on"
1291                         " Target Portal Group: %hu, ignoring request.\n",
1292                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1293                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1294                 spin_unlock(&tpg->tpg_lun_lock);
1295                 return NULL;
1296         }
1297         spin_unlock(&tpg->tpg_lun_lock);
1298
1299         return lun;
1300 }
1301
1302 /*      core_dev_get_lun():
1303  *
1304  *
1305  */
1306 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1307 {
1308         struct se_lun *lun;
1309
1310         spin_lock(&tpg->tpg_lun_lock);
1311         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1312                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1313                         "_TPG-1: %u for Target Portal Group: %hu\n",
1314                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1315                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1316                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1317                 spin_unlock(&tpg->tpg_lun_lock);
1318                 return NULL;
1319         }
1320         lun = tpg->tpg_lun_list[unpacked_lun];
1321
1322         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1323                 pr_err("%s Logical Unit Number: %u is not active on"
1324                         " Target Portal Group: %hu, ignoring request.\n",
1325                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1326                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1327                 spin_unlock(&tpg->tpg_lun_lock);
1328                 return NULL;
1329         }
1330         spin_unlock(&tpg->tpg_lun_lock);
1331
1332         return lun;
1333 }
1334
1335 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1336         struct se_portal_group *tpg,
1337         struct se_node_acl *nacl,
1338         u32 mapped_lun,
1339         int *ret)
1340 {
1341         struct se_lun_acl *lacl;
1342
1343         if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
1344                 pr_err("%s InitiatorName exceeds maximum size.\n",
1345                         tpg->se_tpg_tfo->get_fabric_name());
1346                 *ret = -EOVERFLOW;
1347                 return NULL;
1348         }
1349         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1350         if (!lacl) {
1351                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1352                 *ret = -ENOMEM;
1353                 return NULL;
1354         }
1355
1356         INIT_LIST_HEAD(&lacl->lacl_list);
1357         lacl->mapped_lun = mapped_lun;
1358         lacl->se_lun_nacl = nacl;
1359         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s",
1360                  nacl->initiatorname);
1361
1362         return lacl;
1363 }
1364
1365 int core_dev_add_initiator_node_lun_acl(
1366         struct se_portal_group *tpg,
1367         struct se_lun_acl *lacl,
1368         u32 unpacked_lun,
1369         u32 lun_access)
1370 {
1371         struct se_lun *lun;
1372         struct se_node_acl *nacl;
1373
1374         lun = core_dev_get_lun(tpg, unpacked_lun);
1375         if (!lun) {
1376                 pr_err("%s Logical Unit Number: %u is not active on"
1377                         " Target Portal Group: %hu, ignoring request.\n",
1378                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1379                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1380                 return -EINVAL;
1381         }
1382
1383         nacl = lacl->se_lun_nacl;
1384         if (!nacl)
1385                 return -EINVAL;
1386
1387         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1388             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1389                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1390
1391         lacl->se_lun = lun;
1392
1393         if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
1394                         lun_access, nacl, tpg) < 0)
1395                 return -EINVAL;
1396
1397         spin_lock(&lun->lun_acl_lock);
1398         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1399         atomic_inc(&lun->lun_acl_count);
1400         smp_mb__after_atomic();
1401         spin_unlock(&lun->lun_acl_lock);
1402
1403         pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1404                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1405                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1406                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1407                 lacl->initiatorname);
1408         /*
1409          * Check to see if there are any existing persistent reservation APTPL
1410          * pre-registrations that need to be enabled for this LUN ACL..
1411          */
1412         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1413         return 0;
1414 }
1415
1416 /*      core_dev_del_initiator_node_lun_acl():
1417  *
1418  *
1419  */
1420 int core_dev_del_initiator_node_lun_acl(
1421         struct se_portal_group *tpg,
1422         struct se_lun *lun,
1423         struct se_lun_acl *lacl)
1424 {
1425         struct se_node_acl *nacl;
1426
1427         nacl = lacl->se_lun_nacl;
1428         if (!nacl)
1429                 return -EINVAL;
1430
1431         spin_lock(&lun->lun_acl_lock);
1432         list_del(&lacl->lacl_list);
1433         atomic_dec(&lun->lun_acl_count);
1434         smp_mb__after_atomic();
1435         spin_unlock(&lun->lun_acl_lock);
1436
1437         core_disable_device_list_for_node(lun, NULL, lacl->mapped_lun,
1438                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
1439
1440         lacl->se_lun = NULL;
1441
1442         pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1443                 " InitiatorNode: %s Mapped LUN: %u\n",
1444                 tpg->se_tpg_tfo->get_fabric_name(),
1445                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1446                 lacl->initiatorname, lacl->mapped_lun);
1447
1448         return 0;
1449 }
1450
1451 void core_dev_free_initiator_node_lun_acl(
1452         struct se_portal_group *tpg,
1453         struct se_lun_acl *lacl)
1454 {
1455         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1456                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1457                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1458                 tpg->se_tpg_tfo->get_fabric_name(),
1459                 lacl->initiatorname, lacl->mapped_lun);
1460
1461         kfree(lacl);
1462 }
1463
1464 static void scsi_dump_inquiry(struct se_device *dev)
1465 {
1466         struct t10_wwn *wwn = &dev->t10_wwn;
1467         char buf[17];
1468         int i, device_type;
1469         /*
1470          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1471          */
1472         for (i = 0; i < 8; i++)
1473                 if (wwn->vendor[i] >= 0x20)
1474                         buf[i] = wwn->vendor[i];
1475                 else
1476                         buf[i] = ' ';
1477         buf[i] = '\0';
1478         pr_debug("  Vendor: %s\n", buf);
1479
1480         for (i = 0; i < 16; i++)
1481                 if (wwn->model[i] >= 0x20)
1482                         buf[i] = wwn->model[i];
1483                 else
1484                         buf[i] = ' ';
1485         buf[i] = '\0';
1486         pr_debug("  Model: %s\n", buf);
1487
1488         for (i = 0; i < 4; i++)
1489                 if (wwn->revision[i] >= 0x20)
1490                         buf[i] = wwn->revision[i];
1491                 else
1492                         buf[i] = ' ';
1493         buf[i] = '\0';
1494         pr_debug("  Revision: %s\n", buf);
1495
1496         device_type = dev->transport->get_device_type(dev);
1497         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1498 }
1499
1500 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
1501 {
1502         struct se_device *dev;
1503         struct se_lun *xcopy_lun;
1504
1505         dev = hba->transport->alloc_device(hba, name);
1506         if (!dev)
1507                 return NULL;
1508
1509         dev->dev_link_magic = SE_DEV_LINK_MAGIC;
1510         dev->se_hba = hba;
1511         dev->transport = hba->transport;
1512         dev->prot_length = sizeof(struct se_dif_v1_tuple);
1513
1514         INIT_LIST_HEAD(&dev->dev_list);
1515         INIT_LIST_HEAD(&dev->dev_sep_list);
1516         INIT_LIST_HEAD(&dev->dev_tmr_list);
1517         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1518         INIT_LIST_HEAD(&dev->state_list);
1519         INIT_LIST_HEAD(&dev->qf_cmd_list);
1520         INIT_LIST_HEAD(&dev->g_dev_node);
1521         spin_lock_init(&dev->execute_task_lock);
1522         spin_lock_init(&dev->delayed_cmd_lock);
1523         spin_lock_init(&dev->dev_reservation_lock);
1524         spin_lock_init(&dev->se_port_lock);
1525         spin_lock_init(&dev->se_tmr_lock);
1526         spin_lock_init(&dev->qf_cmd_lock);
1527         sema_init(&dev->caw_sem, 1);
1528         atomic_set(&dev->dev_ordered_id, 0);
1529         INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
1530         spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
1531         INIT_LIST_HEAD(&dev->t10_pr.registration_list);
1532         INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
1533         spin_lock_init(&dev->t10_pr.registration_lock);
1534         spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
1535         INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
1536         spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
1537         INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
1538         spin_lock_init(&dev->t10_alua.lba_map_lock);
1539
1540         dev->t10_wwn.t10_dev = dev;
1541         dev->t10_alua.t10_dev = dev;
1542
1543         dev->dev_attrib.da_dev = dev;
1544         dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
1545         dev->dev_attrib.emulate_dpo = DA_EMULATE_DPO;
1546         dev->dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
1547         dev->dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
1548         dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
1549         dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
1550         dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
1551         dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
1552         dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
1553         dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
1554         dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
1555         dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
1556         dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
1557         dev->dev_attrib.is_nonrot = DA_IS_NONROT;
1558         dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
1559         dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
1560         dev->dev_attrib.max_unmap_block_desc_count =
1561                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
1562         dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
1563         dev->dev_attrib.unmap_granularity_alignment =
1564                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
1565         dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
1566         dev->dev_attrib.fabric_max_sectors = DA_FABRIC_MAX_SECTORS;
1567         dev->dev_attrib.optimal_sectors = DA_FABRIC_MAX_SECTORS;
1568
1569         xcopy_lun = &dev->xcopy_lun;
1570         xcopy_lun->lun_se_dev = dev;
1571         init_completion(&xcopy_lun->lun_shutdown_comp);
1572         INIT_LIST_HEAD(&xcopy_lun->lun_acl_list);
1573         spin_lock_init(&xcopy_lun->lun_acl_lock);
1574         spin_lock_init(&xcopy_lun->lun_sep_lock);
1575         init_completion(&xcopy_lun->lun_ref_comp);
1576
1577         return dev;
1578 }
1579
1580 int target_configure_device(struct se_device *dev)
1581 {
1582         struct se_hba *hba = dev->se_hba;
1583         int ret;
1584
1585         if (dev->dev_flags & DF_CONFIGURED) {
1586                 pr_err("se_dev->se_dev_ptr already set for storage"
1587                                 " object\n");
1588                 return -EEXIST;
1589         }
1590
1591         ret = dev->transport->configure_device(dev);
1592         if (ret)
1593                 goto out;
1594         dev->dev_flags |= DF_CONFIGURED;
1595
1596         /*
1597          * XXX: there is not much point to have two different values here..
1598          */
1599         dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
1600         dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
1601
1602         /*
1603          * Align max_hw_sectors down to PAGE_SIZE I/O transfers
1604          */
1605         dev->dev_attrib.hw_max_sectors =
1606                 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
1607                                          dev->dev_attrib.hw_block_size);
1608
1609         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1610         dev->creation_time = get_jiffies_64();
1611
1612         ret = core_setup_alua(dev);
1613         if (ret)
1614                 goto out;
1615
1616         /*
1617          * Startup the struct se_device processing thread
1618          */
1619         dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1620                                       dev->transport->name);
1621         if (!dev->tmr_wq) {
1622                 pr_err("Unable to create tmr workqueue for %s\n",
1623                         dev->transport->name);
1624                 ret = -ENOMEM;
1625                 goto out_free_alua;
1626         }
1627
1628         /*
1629          * Setup work_queue for QUEUE_FULL
1630          */
1631         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1632
1633         /*
1634          * Preload the initial INQUIRY const values if we are doing
1635          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1636          * passthrough because this is being provided by the backend LLD.
1637          */
1638         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1639                 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1640                 strncpy(&dev->t10_wwn.model[0],
1641                         dev->transport->inquiry_prod, 16);
1642                 strncpy(&dev->t10_wwn.revision[0],
1643                         dev->transport->inquiry_rev, 4);
1644         }
1645
1646         scsi_dump_inquiry(dev);
1647
1648         spin_lock(&hba->device_lock);
1649         hba->dev_count++;
1650         spin_unlock(&hba->device_lock);
1651
1652         mutex_lock(&g_device_mutex);
1653         list_add_tail(&dev->g_dev_node, &g_device_list);
1654         mutex_unlock(&g_device_mutex);
1655
1656         return 0;
1657
1658 out_free_alua:
1659         core_alua_free_lu_gp_mem(dev);
1660 out:
1661         se_release_vpd_for_dev(dev);
1662         return ret;
1663 }
1664
1665 void target_free_device(struct se_device *dev)
1666 {
1667         struct se_hba *hba = dev->se_hba;
1668
1669         WARN_ON(!list_empty(&dev->dev_sep_list));
1670
1671         if (dev->dev_flags & DF_CONFIGURED) {
1672                 destroy_workqueue(dev->tmr_wq);
1673
1674                 mutex_lock(&g_device_mutex);
1675                 list_del(&dev->g_dev_node);
1676                 mutex_unlock(&g_device_mutex);
1677
1678                 spin_lock(&hba->device_lock);
1679                 hba->dev_count--;
1680                 spin_unlock(&hba->device_lock);
1681         }
1682
1683         core_alua_free_lu_gp_mem(dev);
1684         core_alua_set_lba_map(dev, NULL, 0, 0);
1685         core_scsi3_free_all_registrations(dev);
1686         se_release_vpd_for_dev(dev);
1687
1688         if (dev->transport->free_prot)
1689                 dev->transport->free_prot(dev);
1690
1691         dev->transport->free_device(dev);
1692 }
1693
1694 int core_dev_setup_virtual_lun0(void)
1695 {
1696         struct se_hba *hba;
1697         struct se_device *dev;
1698         char buf[] = "rd_pages=8,rd_nullio=1";
1699         int ret;
1700
1701         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1702         if (IS_ERR(hba))
1703                 return PTR_ERR(hba);
1704
1705         dev = target_alloc_device(hba, "virt_lun0");
1706         if (!dev) {
1707                 ret = -ENOMEM;
1708                 goto out_free_hba;
1709         }
1710
1711         hba->transport->set_configfs_dev_params(dev, buf, sizeof(buf));
1712
1713         ret = target_configure_device(dev);
1714         if (ret)
1715                 goto out_free_se_dev;
1716
1717         lun0_hba = hba;
1718         g_lun0_dev = dev;
1719         return 0;
1720
1721 out_free_se_dev:
1722         target_free_device(dev);
1723 out_free_hba:
1724         core_delete_hba(hba);
1725         return ret;
1726 }
1727
1728
1729 void core_dev_release_virtual_lun0(void)
1730 {
1731         struct se_hba *hba = lun0_hba;
1732
1733         if (!hba)
1734                 return;
1735
1736         if (g_lun0_dev)
1737                 target_free_device(g_lun0_dev);
1738         core_delete_hba(hba);
1739 }