Pileus Git - ~andy/linux/blob - drivers/target/target_core_transport.c

   1 /*******************************************************************************
   2  * Filename:  target_core_transport.c
   3  *
   4  * This file contains the Generic Target Engine Core.
   5  *
   6  * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
   7  * Copyright (c) 2005, 2006, 2007 SBE, Inc.
   8  * Copyright (c) 2007-2010 Rising Tide Systems
   9  * Copyright (c) 2008-2010 Linux-iSCSI.org
  10  *
  11  * Nicholas A. Bellinger <nab@kernel.org>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26  *
  27  ******************************************************************************/
  28
  29 #include <linux/net.h>
  30 #include <linux/delay.h>
  31 #include <linux/string.h>
  32 #include <linux/timer.h>
  33 #include <linux/slab.h>
  34 #include <linux/blkdev.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/kthread.h>
  37 #include <linux/in.h>
  38 #include <linux/cdrom.h>
  39 #include <linux/module.h>
  40 #include <linux/ratelimit.h>
  41 #include <asm/unaligned.h>
  42 #include <net/sock.h>
  43 #include <net/tcp.h>
  44 #include <scsi/scsi.h>
  45 #include <scsi/scsi_cmnd.h>
  46 #include <scsi/scsi_tcq.h>
  47
  48 #include <target/target_core_base.h>
  49 #include <target/target_core_backend.h>
  50 #include <target/target_core_fabric.h>
  51 #include <target/target_core_configfs.h>
  52
  53 #include "target_core_internal.h"
  54 #include "target_core_alua.h"
  55 #include "target_core_pr.h"
  56 #include "target_core_ua.h"
  57
  58 static int sub_api_initialized;
  59
  60 static struct workqueue_struct *target_completion_wq;
  61 static struct kmem_cache *se_sess_cache;
  62 struct kmem_cache *se_ua_cache;
  63 struct kmem_cache *t10_pr_reg_cache;
  64 struct kmem_cache *t10_alua_lu_gp_cache;
  65 struct kmem_cache *t10_alua_lu_gp_mem_cache;
  66 struct kmem_cache *t10_alua_tg_pt_gp_cache;
  67 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
  68
  69 static int transport_generic_write_pending(struct se_cmd *);
  70 static int transport_processing_thread(void *param);
  71 static void transport_complete_task_attr(struct se_cmd *cmd);
  72 static void transport_handle_queue_full(struct se_cmd *cmd,
  73                 struct se_device *dev);
  74 static int transport_generic_get_mem(struct se_cmd *cmd);
  75 static void transport_put_cmd(struct se_cmd *cmd);
  76 static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
  77 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
  78 static void target_complete_ok_work(struct work_struct *work);
  79
  80 int init_se_kmem_caches(void)
  81 {
  82         se_sess_cache = kmem_cache_create("se_sess_cache",
  83                         sizeof(struct se_session), __alignof__(struct se_session),
  84                         0, NULL);
  85         if (!se_sess_cache) {
  86                 pr_err("kmem_cache_create() for struct se_session"
  87                                 " failed\n");
  88                 goto out;
  89         }
  90         se_ua_cache = kmem_cache_create("se_ua_cache",
  91                         sizeof(struct se_ua), __alignof__(struct se_ua),
  92                         0, NULL);
  93         if (!se_ua_cache) {
  94                 pr_err("kmem_cache_create() for struct se_ua failed\n");
  95                 goto out_free_sess_cache;
  96         }
  97         t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
  98                         sizeof(struct t10_pr_registration),
  99                         __alignof__(struct t10_pr_registration), 0, NULL);
 100         if (!t10_pr_reg_cache) {
 101                 pr_err("kmem_cache_create() for struct t10_pr_registration"
 102                                 " failed\n");
 103                 goto out_free_ua_cache;
 104         }
 105         t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
 106                         sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
 107                         0, NULL);
 108         if (!t10_alua_lu_gp_cache) {
 109                 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
 110                                 " failed\n");
 111                 goto out_free_pr_reg_cache;
 112         }
 113         t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
 114                         sizeof(struct t10_alua_lu_gp_member),
 115                         __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
 116         if (!t10_alua_lu_gp_mem_cache) {
 117                 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
 118                                 "cache failed\n");
 119                 goto out_free_lu_gp_cache;
 120         }
 121         t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
 122                         sizeof(struct t10_alua_tg_pt_gp),
 123                         __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
 124         if (!t10_alua_tg_pt_gp_cache) {
 125                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 126                                 "cache failed\n");
 127                 goto out_free_lu_gp_mem_cache;
 128         }
 129         t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
 130                         "t10_alua_tg_pt_gp_mem_cache",
 131                         sizeof(struct t10_alua_tg_pt_gp_member),
 132                         __alignof__(struct t10_alua_tg_pt_gp_member),
 133                         0, NULL);
 134         if (!t10_alua_tg_pt_gp_mem_cache) {
 135                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 136                                 "mem_t failed\n");
 137                 goto out_free_tg_pt_gp_cache;
 138         }
 139
 140         target_completion_wq = alloc_workqueue("target_completion",
 141                                                WQ_MEM_RECLAIM, 0);
 142         if (!target_completion_wq)
 143                 goto out_free_tg_pt_gp_mem_cache;
 144
 145         return 0;
 146
 147 out_free_tg_pt_gp_mem_cache:
 148         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 149 out_free_tg_pt_gp_cache:
 150         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 151 out_free_lu_gp_mem_cache:
 152         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 153 out_free_lu_gp_cache:
 154         kmem_cache_destroy(t10_alua_lu_gp_cache);
 155 out_free_pr_reg_cache:
 156         kmem_cache_destroy(t10_pr_reg_cache);
 157 out_free_ua_cache:
 158         kmem_cache_destroy(se_ua_cache);
 159 out_free_sess_cache:
 160         kmem_cache_destroy(se_sess_cache);
 161 out:
 162         return -ENOMEM;
 163 }
 164
 165 void release_se_kmem_caches(void)
 166 {
 167         destroy_workqueue(target_completion_wq);
 168         kmem_cache_destroy(se_sess_cache);
 169         kmem_cache_destroy(se_ua_cache);
 170         kmem_cache_destroy(t10_pr_reg_cache);
 171         kmem_cache_destroy(t10_alua_lu_gp_cache);
 172         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 173         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 174         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 175 }
 176
 177 /* This code ensures unique mib indexes are handed out. */
 178 static DEFINE_SPINLOCK(scsi_mib_index_lock);
 179 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
 180
 181 /*
 182  * Allocate a new row index for the entry type specified
 183  */
 184 u32 scsi_get_new_index(scsi_index_t type)
 185 {
 186         u32 new_index;
 187
 188         BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
 189
 190         spin_lock(&scsi_mib_index_lock);
 191         new_index = ++scsi_mib_index[type];
 192         spin_unlock(&scsi_mib_index_lock);
 193
 194         return new_index;
 195 }
 196
 197 static void transport_init_queue_obj(struct se_queue_obj *qobj)
 198 {
 199         atomic_set(&qobj->queue_cnt, 0);
 200         INIT_LIST_HEAD(&qobj->qobj_list);
 201         init_waitqueue_head(&qobj->thread_wq);
 202         spin_lock_init(&qobj->cmd_queue_lock);
 203 }
 204
 205 void transport_subsystem_check_init(void)
 206 {
 207         int ret;
 208
 209         if (sub_api_initialized)
 210                 return;
 211
 212         ret = request_module("target_core_iblock");
 213         if (ret != 0)
 214                 pr_err("Unable to load target_core_iblock\n");
 215
 216         ret = request_module("target_core_file");
 217         if (ret != 0)
 218                 pr_err("Unable to load target_core_file\n");
 219
 220         ret = request_module("target_core_pscsi");
 221         if (ret != 0)
 222                 pr_err("Unable to load target_core_pscsi\n");
 223
 224         ret = request_module("target_core_stgt");
 225         if (ret != 0)
 226                 pr_err("Unable to load target_core_stgt\n");
 227
 228         sub_api_initialized = 1;
 229         return;
 230 }
 231
 232 struct se_session *transport_init_session(void)
 233 {
 234         struct se_session *se_sess;
 235
 236         se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
 237         if (!se_sess) {
 238                 pr_err("Unable to allocate struct se_session from"
 239                                 " se_sess_cache\n");
 240                 return ERR_PTR(-ENOMEM);
 241         }
 242         INIT_LIST_HEAD(&se_sess->sess_list);
 243         INIT_LIST_HEAD(&se_sess->sess_acl_list);
 244         INIT_LIST_HEAD(&se_sess->sess_cmd_list);
 245         INIT_LIST_HEAD(&se_sess->sess_wait_list);
 246         spin_lock_init(&se_sess->sess_cmd_lock);
 247         kref_init(&se_sess->sess_kref);
 248
 249         return se_sess;
 250 }
 251 EXPORT_SYMBOL(transport_init_session);
 252
 253 /*
 254  * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
 255  */
 256 void __transport_register_session(
 257         struct se_portal_group *se_tpg,
 258         struct se_node_acl *se_nacl,
 259         struct se_session *se_sess,
 260         void *fabric_sess_ptr)
 261 {
 262         unsigned char buf[PR_REG_ISID_LEN];
 263
 264         se_sess->se_tpg = se_tpg;
 265         se_sess->fabric_sess_ptr = fabric_sess_ptr;
 266         /*
 267          * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
 268          *
 269          * Only set for struct se_session's that will actually be moving I/O.
 270          * eg: *NOT* discovery sessions.
 271          */
 272         if (se_nacl) {
 273                 /*
 274                  * If the fabric module supports an ISID based TransportID,
 275                  * save this value in binary from the fabric I_T Nexus now.
 276                  */
 277                 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
 278                         memset(&buf[0], 0, PR_REG_ISID_LEN);
 279                         se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
 280                                         &buf[0], PR_REG_ISID_LEN);
 281                         se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
 282                 }
 283                 kref_get(&se_nacl->acl_kref);
 284
 285                 spin_lock_irq(&se_nacl->nacl_sess_lock);
 286                 /*
 287                  * The se_nacl->nacl_sess pointer will be set to the
 288                  * last active I_T Nexus for each struct se_node_acl.
 289                  */
 290                 se_nacl->nacl_sess = se_sess;
 291
 292                 list_add_tail(&se_sess->sess_acl_list,
 293                               &se_nacl->acl_sess_list);
 294                 spin_unlock_irq(&se_nacl->nacl_sess_lock);
 295         }
 296         list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
 297
 298         pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
 299                 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
 300 }
 301 EXPORT_SYMBOL(__transport_register_session);
 302
 303 void transport_register_session(
 304         struct se_portal_group *se_tpg,
 305         struct se_node_acl *se_nacl,
 306         struct se_session *se_sess,
 307         void *fabric_sess_ptr)
 308 {
 309         unsigned long flags;
 310
 311         spin_lock_irqsave(&se_tpg->session_lock, flags);
 312         __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
 313         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 314 }
 315 EXPORT_SYMBOL(transport_register_session);
 316
 317 void target_release_session(struct kref *kref)
 318 {
 319         struct se_session *se_sess = container_of(kref,
 320                         struct se_session, sess_kref);
 321         struct se_portal_group *se_tpg = se_sess->se_tpg;
 322
 323         se_tpg->se_tpg_tfo->close_session(se_sess);
 324 }
 325
 326 void target_get_session(struct se_session *se_sess)
 327 {
 328         kref_get(&se_sess->sess_kref);
 329 }
 330 EXPORT_SYMBOL(target_get_session);
 331
 332 void target_put_session(struct se_session *se_sess)
 333 {
 334         struct se_portal_group *tpg = se_sess->se_tpg;
 335
 336         if (tpg->se_tpg_tfo->put_session != NULL) {
 337                 tpg->se_tpg_tfo->put_session(se_sess);
 338                 return;
 339         }
 340         kref_put(&se_sess->sess_kref, target_release_session);
 341 }
 342 EXPORT_SYMBOL(target_put_session);
 343
 344 static void target_complete_nacl(struct kref *kref)
 345 {
 346         struct se_node_acl *nacl = container_of(kref,
 347                                 struct se_node_acl, acl_kref);
 348
 349         complete(&nacl->acl_free_comp);
 350 }
 351
 352 void target_put_nacl(struct se_node_acl *nacl)
 353 {
 354         kref_put(&nacl->acl_kref, target_complete_nacl);
 355 }
 356
 357 void transport_deregister_session_configfs(struct se_session *se_sess)
 358 {
 359         struct se_node_acl *se_nacl;
 360         unsigned long flags;
 361         /*
 362          * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
 363          */
 364         se_nacl = se_sess->se_node_acl;
 365         if (se_nacl) {
 366                 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
 367                 if (se_nacl->acl_stop == 0)
 368                         list_del(&se_sess->sess_acl_list);
 369                 /*
 370                  * If the session list is empty, then clear the pointer.
 371                  * Otherwise, set the struct se_session pointer from the tail
 372                  * element of the per struct se_node_acl active session list.
 373                  */
 374                 if (list_empty(&se_nacl->acl_sess_list))
 375                         se_nacl->nacl_sess = NULL;
 376                 else {
 377                         se_nacl->nacl_sess = container_of(
 378                                         se_nacl->acl_sess_list.prev,
 379                                         struct se_session, sess_acl_list);
 380                 }
 381                 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
 382         }
 383 }
 384 EXPORT_SYMBOL(transport_deregister_session_configfs);
 385
 386 void transport_free_session(struct se_session *se_sess)
 387 {
 388         kmem_cache_free(se_sess_cache, se_sess);
 389 }
 390 EXPORT_SYMBOL(transport_free_session);
 391
 392 void transport_deregister_session(struct se_session *se_sess)
 393 {
 394         struct se_portal_group *se_tpg = se_sess->se_tpg;
 395         struct target_core_fabric_ops *se_tfo;
 396         struct se_node_acl *se_nacl;
 397         unsigned long flags;
 398         bool comp_nacl = true;
 399
 400         if (!se_tpg) {
 401                 transport_free_session(se_sess);
 402                 return;
 403         }
 404         se_tfo = se_tpg->se_tpg_tfo;
 405
 406         spin_lock_irqsave(&se_tpg->session_lock, flags);
 407         list_del(&se_sess->sess_list);
 408         se_sess->se_tpg = NULL;
 409         se_sess->fabric_sess_ptr = NULL;
 410         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 411
 412         /*
 413          * Determine if we need to do extra work for this initiator node's
 414          * struct se_node_acl if it had been previously dynamically generated.
 415          */
 416         se_nacl = se_sess->se_node_acl;
 417
 418         spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 419         if (se_nacl && se_nacl->dynamic_node_acl) {
 420                 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
 421                         list_del(&se_nacl->acl_list);
 422                         se_tpg->num_node_acls--;
 423                         spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 424                         core_tpg_wait_for_nacl_pr_ref(se_nacl);
 425                         core_free_device_list_for_node(se_nacl, se_tpg);
 426                         se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
 427
 428                         comp_nacl = false;
 429                         spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 430                 }
 431         }
 432         spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 433
 434         pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
 435                 se_tpg->se_tpg_tfo->get_fabric_name());
 436         /*
 437          * If last kref is dropping now for an explict NodeACL, awake sleeping
 438          * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
 439          * removal context.
 440          */
 441         if (se_nacl && comp_nacl == true)
 442                 target_put_nacl(se_nacl);
 443
 444         transport_free_session(se_sess);
 445 }
 446 EXPORT_SYMBOL(transport_deregister_session);
 447
 448 /*
 449  * Called with cmd->t_state_lock held.
 450  */
 451 static void target_remove_from_state_list(struct se_cmd *cmd)
 452 {
 453         struct se_device *dev = cmd->se_dev;
 454         unsigned long flags;
 455
 456         if (!dev)
 457                 return;
 458
 459         if (cmd->transport_state & CMD_T_BUSY)
 460                 return;
 461
 462         spin_lock_irqsave(&dev->execute_task_lock, flags);
 463         if (cmd->state_active) {
 464                 list_del(&cmd->state_list);
 465                 cmd->state_active = false;
 466         }
 467         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 468 }
 469
 470 static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists)
 471 {
 472         unsigned long flags;
 473
 474         spin_lock_irqsave(&cmd->t_state_lock, flags);
 475         /*
 476          * Determine if IOCTL context caller in requesting the stopping of this
 477          * command for LUN shutdown purposes.
 478          */
 479         if (cmd->transport_state & CMD_T_LUN_STOP) {
 480                 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
 481                         __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
 482
 483                 cmd->transport_state &= ~CMD_T_ACTIVE;
 484                 if (remove_from_lists)
 485                         target_remove_from_state_list(cmd);
 486                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 487
 488                 complete(&cmd->transport_lun_stop_comp);
 489                 return 1;
 490         }
 491
 492         if (remove_from_lists) {
 493                 target_remove_from_state_list(cmd);
 494
 495                 /*
 496                  * Clear struct se_cmd->se_lun before the handoff to FE.
 497                  */
 498                 cmd->se_lun = NULL;
 499         }
 500
 501         /*
 502          * Determine if frontend context caller is requesting the stopping of
 503          * this command for frontend exceptions.
 504          */
 505         if (cmd->transport_state & CMD_T_STOP) {
 506                 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
 507                         __func__, __LINE__,
 508                         cmd->se_tfo->get_task_tag(cmd));
 509
 510                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 511
 512                 complete(&cmd->t_transport_stop_comp);
 513                 return 1;
 514         }
 515
 516         cmd->transport_state &= ~CMD_T_ACTIVE;
 517         if (remove_from_lists) {
 518                 /*
 519                  * Some fabric modules like tcm_loop can release
 520                  * their internally allocated I/O reference now and
 521                  * struct se_cmd now.
 522                  *
 523                  * Fabric modules are expected to return '1' here if the
 524                  * se_cmd being passed is released at this point,
 525                  * or zero if not being released.
 526                  */
 527                 if (cmd->se_tfo->check_stop_free != NULL) {
 528                         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 529                         return cmd->se_tfo->check_stop_free(cmd);
 530                 }
 531         }
 532
 533         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 534         return 0;
 535 }
 536
 537 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
 538 {
 539         return transport_cmd_check_stop(cmd, true);
 540 }
 541
 542 static void transport_lun_remove_cmd(struct se_cmd *cmd)
 543 {
 544         struct se_lun *lun = cmd->se_lun;
 545         unsigned long flags;
 546
 547         if (!lun)
 548                 return;
 549
 550         spin_lock_irqsave(&cmd->t_state_lock, flags);
 551         if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
 552                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
 553                 target_remove_from_state_list(cmd);
 554         }
 555         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 556
 557         spin_lock_irqsave(&lun->lun_cmd_lock, flags);
 558         if (!list_empty(&cmd->se_lun_node))
 559                 list_del_init(&cmd->se_lun_node);
 560         spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
 561 }
 562
 563 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
 564 {
 565         if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
 566                 transport_lun_remove_cmd(cmd);
 567
 568         if (transport_cmd_check_stop_to_fabric(cmd))
 569                 return;
 570         if (remove) {
 571                 transport_remove_cmd_from_queue(cmd);
 572                 transport_put_cmd(cmd);
 573         }
 574 }
 575
 576 static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
 577                 bool at_head)
 578 {
 579         struct se_device *dev = cmd->se_dev;
 580         struct se_queue_obj *qobj = &dev->dev_queue_obj;
 581         unsigned long flags;
 582
 583         if (t_state) {
 584                 spin_lock_irqsave(&cmd->t_state_lock, flags);
 585                 cmd->t_state = t_state;
 586                 cmd->transport_state |= CMD_T_ACTIVE;
 587                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 588         }
 589
 590         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 591
 592         /* If the cmd is already on the list, remove it before we add it */
 593         if (!list_empty(&cmd->se_queue_node))
 594                 list_del(&cmd->se_queue_node);
 595         else
 596                 atomic_inc(&qobj->queue_cnt);
 597
 598         if (at_head)
 599                 list_add(&cmd->se_queue_node, &qobj->qobj_list);
 600         else
 601                 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
 602         cmd->transport_state |= CMD_T_QUEUED;
 603         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 604
 605         wake_up_interruptible(&qobj->thread_wq);
 606 }
 607
 608 static struct se_cmd *
 609 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
 610 {
 611         struct se_cmd *cmd;
 612         unsigned long flags;
 613
 614         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 615         if (list_empty(&qobj->qobj_list)) {
 616                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 617                 return NULL;
 618         }
 619         cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
 620
 621         cmd->transport_state &= ~CMD_T_QUEUED;
 622         list_del_init(&cmd->se_queue_node);
 623         atomic_dec(&qobj->queue_cnt);
 624         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 625
 626         return cmd;
 627 }
 628
 629 static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
 630 {
 631         struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
 632         unsigned long flags;
 633
 634         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 635         if (!(cmd->transport_state & CMD_T_QUEUED)) {
 636                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 637                 return;
 638         }
 639         cmd->transport_state &= ~CMD_T_QUEUED;
 640         atomic_dec(&qobj->queue_cnt);
 641         list_del_init(&cmd->se_queue_node);
 642         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 643 }
 644
 645 static void target_complete_failure_work(struct work_struct *work)
 646 {
 647         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
 648
 649         transport_generic_request_failure(cmd);
 650 }
 651
 652 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
 653 {
 654         struct se_device *dev = cmd->se_dev;
 655         int success = scsi_status == GOOD;
 656         unsigned long flags;
 657
 658         cmd->scsi_status = scsi_status;
 659
 660
 661         spin_lock_irqsave(&cmd->t_state_lock, flags);
 662         cmd->transport_state &= ~CMD_T_BUSY;
 663
 664         if (dev && dev->transport->transport_complete) {
 665                 if (dev->transport->transport_complete(cmd,
 666                                 cmd->t_data_sg) != 0) {
 667                         cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
 668                         success = 1;
 669                 }
 670         }
 671
 672         /*
 673          * See if we are waiting to complete for an exception condition.
 674          */
 675         if (cmd->transport_state & CMD_T_REQUEST_STOP) {
 676                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 677                 complete(&cmd->task_stop_comp);
 678                 return;
 679         }
 680
 681         if (!success)
 682                 cmd->transport_state |= CMD_T_FAILED;
 683
 684         /*
 685          * Check for case where an explict ABORT_TASK has been received
 686          * and transport_wait_for_tasks() will be waiting for completion..
 687          */
 688         if (cmd->transport_state & CMD_T_ABORTED &&
 689             cmd->transport_state & CMD_T_STOP) {
 690                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 691                 complete(&cmd->t_transport_stop_comp);
 692                 return;
 693         } else if (cmd->transport_state & CMD_T_FAILED) {
 694                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 695                 INIT_WORK(&cmd->work, target_complete_failure_work);
 696         } else {
 697                 INIT_WORK(&cmd->work, target_complete_ok_work);
 698         }
 699
 700         cmd->t_state = TRANSPORT_COMPLETE;
 701         cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
 702         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 703
 704         queue_work(target_completion_wq, &cmd->work);
 705 }
 706 EXPORT_SYMBOL(target_complete_cmd);
 707
 708 static void target_add_to_state_list(struct se_cmd *cmd)
 709 {
 710         struct se_device *dev = cmd->se_dev;
 711         unsigned long flags;
 712
 713         spin_lock_irqsave(&dev->execute_task_lock, flags);
 714         if (!cmd->state_active) {
 715                 list_add_tail(&cmd->state_list, &dev->state_list);
 716                 cmd->state_active = true;
 717         }
 718         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 719 }
 720
 721 /*
 722  * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
 723  */
 724
 725 static void target_qf_do_work(struct work_struct *work)
 726 {
 727         struct se_device *dev = container_of(work, struct se_device,
 728                                         qf_work_queue);
 729         LIST_HEAD(qf_cmd_list);
 730         struct se_cmd *cmd, *cmd_tmp;
 731
 732         spin_lock_irq(&dev->qf_cmd_lock);
 733         list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
 734         spin_unlock_irq(&dev->qf_cmd_lock);
 735
 736         list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
 737                 list_del(&cmd->se_qf_node);
 738                 atomic_dec(&dev->dev_qf_count);
 739                 smp_mb__after_atomic_dec();
 740
 741                 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
 742                         " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
 743                         (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
 744                         (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
 745                         : "UNKNOWN");
 746
 747                 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
 748         }
 749 }
 750
 751 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
 752 {
 753         switch (cmd->data_direction) {
 754         case DMA_NONE:
 755                 return "NONE";
 756         case DMA_FROM_DEVICE:
 757                 return "READ";
 758         case DMA_TO_DEVICE:
 759                 return "WRITE";
 760         case DMA_BIDIRECTIONAL:
 761                 return "BIDI";
 762         default:
 763                 break;
 764         }
 765
 766         return "UNKNOWN";
 767 }
 768
 769 void transport_dump_dev_state(
 770         struct se_device *dev,
 771         char *b,
 772         int *bl)
 773 {
 774         *bl += sprintf(b + *bl, "Status: ");
 775         switch (dev->dev_status) {
 776         case TRANSPORT_DEVICE_ACTIVATED:
 777                 *bl += sprintf(b + *bl, "ACTIVATED");
 778                 break;
 779         case TRANSPORT_DEVICE_DEACTIVATED:
 780                 *bl += sprintf(b + *bl, "DEACTIVATED");
 781                 break;
 782         case TRANSPORT_DEVICE_SHUTDOWN:
 783                 *bl += sprintf(b + *bl, "SHUTDOWN");
 784                 break;
 785         case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
 786         case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
 787                 *bl += sprintf(b + *bl, "OFFLINE");
 788                 break;
 789         default:
 790                 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
 791                 break;
 792         }
 793
 794         *bl += sprintf(b + *bl, "  Max Queue Depth: %d", dev->queue_depth);
 795         *bl += sprintf(b + *bl, "  SectorSize: %u  HwMaxSectors: %u\n",
 796                 dev->se_sub_dev->se_dev_attrib.block_size,
 797                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
 798         *bl += sprintf(b + *bl, "        ");
 799 }
 800
 801 void transport_dump_vpd_proto_id(
 802         struct t10_vpd *vpd,
 803         unsigned char *p_buf,
 804         int p_buf_len)
 805 {
 806         unsigned char buf[VPD_TMP_BUF_SIZE];
 807         int len;
 808
 809         memset(buf, 0, VPD_TMP_BUF_SIZE);
 810         len = sprintf(buf, "T10 VPD Protocol Identifier: ");
 811
 812         switch (vpd->protocol_identifier) {
 813         case 0x00:
 814                 sprintf(buf+len, "Fibre Channel\n");
 815                 break;
 816         case 0x10:
 817                 sprintf(buf+len, "Parallel SCSI\n");
 818                 break;
 819         case 0x20:
 820                 sprintf(buf+len, "SSA\n");
 821                 break;
 822         case 0x30:
 823                 sprintf(buf+len, "IEEE 1394\n");
 824                 break;
 825         case 0x40:
 826                 sprintf(buf+len, "SCSI Remote Direct Memory Access"
 827                                 " Protocol\n");
 828                 break;
 829         case 0x50:
 830                 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
 831                 break;
 832         case 0x60:
 833                 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
 834                 break;
 835         case 0x70:
 836                 sprintf(buf+len, "Automation/Drive Interface Transport"
 837                                 " Protocol\n");
 838                 break;
 839         case 0x80:
 840                 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
 841                 break;
 842         default:
 843                 sprintf(buf+len, "Unknown 0x%02x\n",
 844                                 vpd->protocol_identifier);
 845                 break;
 846         }
 847
 848         if (p_buf)
 849                 strncpy(p_buf, buf, p_buf_len);
 850         else
 851                 pr_debug("%s", buf);
 852 }
 853
 854 void
 855 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
 856 {
 857         /*
 858          * Check if the Protocol Identifier Valid (PIV) bit is set..
 859          *
 860          * from spc3r23.pdf section 7.5.1
 861          */
 862          if (page_83[1] & 0x80) {
 863                 vpd->protocol_identifier = (page_83[0] & 0xf0);
 864                 vpd->protocol_identifier_set = 1;
 865                 transport_dump_vpd_proto_id(vpd, NULL, 0);
 866         }
 867 }
 868 EXPORT_SYMBOL(transport_set_vpd_proto_id);
 869
 870 int transport_dump_vpd_assoc(
 871         struct t10_vpd *vpd,
 872         unsigned char *p_buf,
 873         int p_buf_len)
 874 {
 875         unsigned char buf[VPD_TMP_BUF_SIZE];
 876         int ret = 0;
 877         int len;
 878
 879         memset(buf, 0, VPD_TMP_BUF_SIZE);
 880         len = sprintf(buf, "T10 VPD Identifier Association: ");
 881
 882         switch (vpd->association) {
 883         case 0x00:
 884                 sprintf(buf+len, "addressed logical unit\n");
 885                 break;
 886         case 0x10:
 887                 sprintf(buf+len, "target port\n");
 888                 break;
 889         case 0x20:
 890                 sprintf(buf+len, "SCSI target device\n");
 891                 break;
 892         default:
 893                 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
 894                 ret = -EINVAL;
 895                 break;
 896         }
 897
 898         if (p_buf)
 899                 strncpy(p_buf, buf, p_buf_len);
 900         else
 901                 pr_debug("%s", buf);
 902
 903         return ret;
 904 }
 905
 906 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
 907 {
 908         /*
 909          * The VPD identification association..
 910          *
 911          * from spc3r23.pdf Section 7.6.3.1 Table 297
 912          */
 913         vpd->association = (page_83[1] & 0x30);
 914         return transport_dump_vpd_assoc(vpd, NULL, 0);
 915 }
 916 EXPORT_SYMBOL(transport_set_vpd_assoc);
 917
 918 int transport_dump_vpd_ident_type(
 919         struct t10_vpd *vpd,
 920         unsigned char *p_buf,
 921         int p_buf_len)
 922 {
 923         unsigned char buf[VPD_TMP_BUF_SIZE];
 924         int ret = 0;
 925         int len;
 926
 927         memset(buf, 0, VPD_TMP_BUF_SIZE);
 928         len = sprintf(buf, "T10 VPD Identifier Type: ");
 929
 930         switch (vpd->device_identifier_type) {
 931         case 0x00:
 932                 sprintf(buf+len, "Vendor specific\n");
 933                 break;
 934         case 0x01:
 935                 sprintf(buf+len, "T10 Vendor ID based\n");
 936                 break;
 937         case 0x02:
 938                 sprintf(buf+len, "EUI-64 based\n");
 939                 break;
 940         case 0x03:
 941                 sprintf(buf+len, "NAA\n");
 942                 break;
 943         case 0x04:
 944                 sprintf(buf+len, "Relative target port identifier\n");
 945                 break;
 946         case 0x08:
 947                 sprintf(buf+len, "SCSI name string\n");
 948                 break;
 949         default:
 950                 sprintf(buf+len, "Unsupported: 0x%02x\n",
 951                                 vpd->device_identifier_type);
 952                 ret = -EINVAL;
 953                 break;
 954         }
 955
 956         if (p_buf) {
 957                 if (p_buf_len < strlen(buf)+1)
 958                         return -EINVAL;
 959                 strncpy(p_buf, buf, p_buf_len);
 960         } else {
 961                 pr_debug("%s", buf);
 962         }
 963
 964         return ret;
 965 }
 966
 967 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
 968 {
 969         /*
 970          * The VPD identifier type..
 971          *
 972          * from spc3r23.pdf Section 7.6.3.1 Table 298
 973          */
 974         vpd->device_identifier_type = (page_83[1] & 0x0f);
 975         return transport_dump_vpd_ident_type(vpd, NULL, 0);
 976 }
 977 EXPORT_SYMBOL(transport_set_vpd_ident_type);
 978
 979 int transport_dump_vpd_ident(
 980         struct t10_vpd *vpd,
 981         unsigned char *p_buf,
 982         int p_buf_len)
 983 {
 984         unsigned char buf[VPD_TMP_BUF_SIZE];
 985         int ret = 0;
 986
 987         memset(buf, 0, VPD_TMP_BUF_SIZE);
 988
 989         switch (vpd->device_identifier_code_set) {
 990         case 0x01: /* Binary */
 991                 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
 992                         &vpd->device_identifier[0]);
 993                 break;
 994         case 0x02: /* ASCII */
 995                 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
 996                         &vpd->device_identifier[0]);
 997                 break;
 998         case 0x03: /* UTF-8 */
 999                 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1000                         &vpd->device_identifier[0]);
1001                 break;
1002         default:
1003                 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1004                         " 0x%02x", vpd->device_identifier_code_set);
1005                 ret = -EINVAL;
1006                 break;
1007         }
1008
1009         if (p_buf)
1010                 strncpy(p_buf, buf, p_buf_len);
1011         else
1012                 pr_debug("%s", buf);
1013
1014         return ret;
1015 }
1016
1017 int
1018 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1019 {
1020         static const char hex_str[] = "0123456789abcdef";
1021         int j = 0, i = 4; /* offset to start of the identifer */
1022
1023         /*
1024          * The VPD Code Set (encoding)
1025          *
1026          * from spc3r23.pdf Section 7.6.3.1 Table 296
1027          */
1028         vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1029         switch (vpd->device_identifier_code_set) {
1030         case 0x01: /* Binary */
1031                 vpd->device_identifier[j++] =
1032                                 hex_str[vpd->device_identifier_type];
1033                 while (i < (4 + page_83[3])) {
1034                         vpd->device_identifier[j++] =
1035                                 hex_str[(page_83[i] & 0xf0) >> 4];
1036                         vpd->device_identifier[j++] =
1037                                 hex_str[page_83[i] & 0x0f];
1038                         i++;
1039                 }
1040                 break;
1041         case 0x02: /* ASCII */
1042         case 0x03: /* UTF-8 */
1043                 while (i < (4 + page_83[3]))
1044                         vpd->device_identifier[j++] = page_83[i++];
1045                 break;
1046         default:
1047                 break;
1048         }
1049
1050         return transport_dump_vpd_ident(vpd, NULL, 0);
1051 }
1052 EXPORT_SYMBOL(transport_set_vpd_ident);
1053
1054 static void core_setup_task_attr_emulation(struct se_device *dev)
1055 {
1056         /*
1057          * If this device is from Target_Core_Mod/pSCSI, disable the
1058          * SAM Task Attribute emulation.
1059          *
1060          * This is currently not available in upsream Linux/SCSI Target
1061          * mode code, and is assumed to be disabled while using TCM/pSCSI.
1062          */
1063         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1064                 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1065                 return;
1066         }
1067
1068         dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1069         pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1070                 " device\n", dev->transport->name,
1071                 dev->transport->get_device_rev(dev));
1072 }
1073
1074 static void scsi_dump_inquiry(struct se_device *dev)
1075 {
1076         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1077         char buf[17];
1078         int i, device_type;
1079         /*
1080          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1081          */
1082         for (i = 0; i < 8; i++)
1083                 if (wwn->vendor[i] >= 0x20)
1084                         buf[i] = wwn->vendor[i];
1085                 else
1086                         buf[i] = ' ';
1087         buf[i] = '\0';
1088         pr_debug("  Vendor: %s\n", buf);
1089
1090         for (i = 0; i < 16; i++)
1091                 if (wwn->model[i] >= 0x20)
1092                         buf[i] = wwn->model[i];
1093                 else
1094                         buf[i] = ' ';
1095         buf[i] = '\0';
1096         pr_debug("  Model: %s\n", buf);
1097
1098         for (i = 0; i < 4; i++)
1099                 if (wwn->revision[i] >= 0x20)
1100                         buf[i] = wwn->revision[i];
1101                 else
1102                         buf[i] = ' ';
1103         buf[i] = '\0';
1104         pr_debug("  Revision: %s\n", buf);
1105
1106         device_type = dev->transport->get_device_type(dev);
1107         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1108         pr_debug("                 ANSI SCSI revision: %02x\n",
1109                                 dev->transport->get_device_rev(dev));
1110 }
1111
1112 struct se_device *transport_add_device_to_core_hba(
1113         struct se_hba *hba,
1114         struct se_subsystem_api *transport,
1115         struct se_subsystem_dev *se_dev,
1116         u32 device_flags,
1117         void *transport_dev,
1118         struct se_dev_limits *dev_limits,
1119         const char *inquiry_prod,
1120         const char *inquiry_rev)
1121 {
1122         int force_pt;
1123         struct se_device  *dev;
1124
1125         dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1126         if (!dev) {
1127                 pr_err("Unable to allocate memory for se_dev_t\n");
1128                 return NULL;
1129         }
1130
1131         transport_init_queue_obj(&dev->dev_queue_obj);
1132         dev->dev_flags          = device_flags;
1133         dev->dev_status         |= TRANSPORT_DEVICE_DEACTIVATED;
1134         dev->dev_ptr            = transport_dev;
1135         dev->se_hba             = hba;
1136         dev->se_sub_dev         = se_dev;
1137         dev->transport          = transport;
1138         INIT_LIST_HEAD(&dev->dev_list);
1139         INIT_LIST_HEAD(&dev->dev_sep_list);
1140         INIT_LIST_HEAD(&dev->dev_tmr_list);
1141         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1142         INIT_LIST_HEAD(&dev->state_list);
1143         INIT_LIST_HEAD(&dev->qf_cmd_list);
1144         spin_lock_init(&dev->execute_task_lock);
1145         spin_lock_init(&dev->delayed_cmd_lock);
1146         spin_lock_init(&dev->dev_reservation_lock);
1147         spin_lock_init(&dev->dev_status_lock);
1148         spin_lock_init(&dev->se_port_lock);
1149         spin_lock_init(&dev->se_tmr_lock);
1150         spin_lock_init(&dev->qf_cmd_lock);
1151         atomic_set(&dev->dev_ordered_id, 0);
1152
1153         se_dev_set_default_attribs(dev, dev_limits);
1154
1155         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1156         dev->creation_time = get_jiffies_64();
1157         spin_lock_init(&dev->stats_lock);
1158
1159         spin_lock(&hba->device_lock);
1160         list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1161         hba->dev_count++;
1162         spin_unlock(&hba->device_lock);
1163         /*
1164          * Setup the SAM Task Attribute emulation for struct se_device
1165          */
1166         core_setup_task_attr_emulation(dev);
1167         /*
1168          * Force PR and ALUA passthrough emulation with internal object use.
1169          */
1170         force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1171         /*
1172          * Setup the Reservations infrastructure for struct se_device
1173          */
1174         core_setup_reservations(dev, force_pt);
1175         /*
1176          * Setup the Asymmetric Logical Unit Assignment for struct se_device
1177          */
1178         if (core_setup_alua(dev, force_pt) < 0)
1179                 goto out;
1180
1181         /*
1182          * Startup the struct se_device processing thread
1183          */
1184         dev->process_thread = kthread_run(transport_processing_thread, dev,
1185                                           "LIO_%s", dev->transport->name);
1186         if (IS_ERR(dev->process_thread)) {
1187                 pr_err("Unable to create kthread: LIO_%s\n",
1188                         dev->transport->name);
1189                 goto out;
1190         }
1191         /*
1192          * Setup work_queue for QUEUE_FULL
1193          */
1194         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1195         /*
1196          * Preload the initial INQUIRY const values if we are doing
1197          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1198          * passthrough because this is being provided by the backend LLD.
1199          * This is required so that transport_get_inquiry() copies these
1200          * originals once back into DEV_T10_WWN(dev) for the virtual device
1201          * setup.
1202          */
1203         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1204                 if (!inquiry_prod || !inquiry_rev) {
1205                         pr_err("All non TCM/pSCSI plugins require"
1206                                 " INQUIRY consts\n");
1207                         goto out;
1208                 }
1209
1210                 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1211                 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1212                 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1213         }
1214         scsi_dump_inquiry(dev);
1215
1216         return dev;
1217 out:
1218         kthread_stop(dev->process_thread);
1219
1220         spin_lock(&hba->device_lock);
1221         list_del(&dev->dev_list);
1222         hba->dev_count--;
1223         spin_unlock(&hba->device_lock);
1224
1225         se_release_vpd_for_dev(dev);
1226
1227         kfree(dev);
1228
1229         return NULL;
1230 }
1231 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1232
1233 int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1234 {
1235         struct se_device *dev = cmd->se_dev;
1236
1237         if (cmd->unknown_data_length) {
1238                 cmd->data_length = size;
1239         } else if (size != cmd->data_length) {
1240                 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1241                         " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1242                         " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1243                                 cmd->data_length, size, cmd->t_task_cdb[0]);
1244
1245                 cmd->cmd_spdtl = size;
1246
1247                 if (cmd->data_direction == DMA_TO_DEVICE) {
1248                         pr_err("Rejecting underflow/overflow"
1249                                         " WRITE data\n");
1250                         goto out_invalid_cdb_field;
1251                 }
1252                 /*
1253                  * Reject READ_* or WRITE_* with overflow/underflow for
1254                  * type SCF_SCSI_DATA_CDB.
1255                  */
1256                 if (dev->se_sub_dev->se_dev_attrib.block_size != 512)  {
1257                         pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1258                                 " CDB on non 512-byte sector setup subsystem"
1259                                 " plugin: %s\n", dev->transport->name);
1260                         /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1261                         goto out_invalid_cdb_field;
1262                 }
1263
1264                 if (size > cmd->data_length) {
1265                         cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1266                         cmd->residual_count = (size - cmd->data_length);
1267                 } else {
1268                         cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1269                         cmd->residual_count = (cmd->data_length - size);
1270                 }
1271                 cmd->data_length = size;
1272         }
1273
1274         return 0;
1275
1276 out_invalid_cdb_field:
1277         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1278         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1279         return -EINVAL;
1280 }
1281
1282 /*
1283  * Used by fabric modules containing a local struct se_cmd within their
1284  * fabric dependent per I/O descriptor.
1285  */
1286 void transport_init_se_cmd(
1287         struct se_cmd *cmd,
1288         struct target_core_fabric_ops *tfo,
1289         struct se_session *se_sess,
1290         u32 data_length,
1291         int data_direction,
1292         int task_attr,
1293         unsigned char *sense_buffer)
1294 {
1295         INIT_LIST_HEAD(&cmd->se_lun_node);
1296         INIT_LIST_HEAD(&cmd->se_delayed_node);
1297         INIT_LIST_HEAD(&cmd->se_qf_node);
1298         INIT_LIST_HEAD(&cmd->se_queue_node);
1299         INIT_LIST_HEAD(&cmd->se_cmd_list);
1300         INIT_LIST_HEAD(&cmd->state_list);
1301         init_completion(&cmd->transport_lun_fe_stop_comp);
1302         init_completion(&cmd->transport_lun_stop_comp);
1303         init_completion(&cmd->t_transport_stop_comp);
1304         init_completion(&cmd->cmd_wait_comp);
1305         init_completion(&cmd->task_stop_comp);
1306         spin_lock_init(&cmd->t_state_lock);
1307         cmd->transport_state = CMD_T_DEV_ACTIVE;
1308
1309         cmd->se_tfo = tfo;
1310         cmd->se_sess = se_sess;
1311         cmd->data_length = data_length;
1312         cmd->data_direction = data_direction;
1313         cmd->sam_task_attr = task_attr;
1314         cmd->sense_buffer = sense_buffer;
1315
1316         cmd->state_active = false;
1317 }
1318 EXPORT_SYMBOL(transport_init_se_cmd);
1319
1320 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1321 {
1322         /*
1323          * Check if SAM Task Attribute emulation is enabled for this
1324          * struct se_device storage object
1325          */
1326         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1327                 return 0;
1328
1329         if (cmd->sam_task_attr == MSG_ACA_TAG) {
1330                 pr_debug("SAM Task Attribute ACA"
1331                         " emulation is not supported\n");
1332                 return -EINVAL;
1333         }
1334         /*
1335          * Used to determine when ORDERED commands should go from
1336          * Dormant to Active status.
1337          */
1338         cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1339         smp_mb__after_atomic_inc();
1340         pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1341                         cmd->se_ordered_id, cmd->sam_task_attr,
1342                         cmd->se_dev->transport->name);
1343         return 0;
1344 }
1345
1346 /*      target_setup_cmd_from_cdb():
1347  *
1348  *      Called from fabric RX Thread.
1349  */
1350 int target_setup_cmd_from_cdb(
1351         struct se_cmd *cmd,
1352         unsigned char *cdb)
1353 {
1354         struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
1355         u32 pr_reg_type = 0;
1356         u8 alua_ascq = 0;
1357         unsigned long flags;
1358         int ret;
1359
1360         /*
1361          * Ensure that the received CDB is less than the max (252 + 8) bytes
1362          * for VARIABLE_LENGTH_CMD
1363          */
1364         if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1365                 pr_err("Received SCSI CDB with command_size: %d that"
1366                         " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1367                         scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1368                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1369                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1370                 return -EINVAL;
1371         }
1372         /*
1373          * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1374          * allocate the additional extended CDB buffer now..  Otherwise
1375          * setup the pointer from __t_task_cdb to t_task_cdb.
1376          */
1377         if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1378                 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1379                                                 GFP_KERNEL);
1380                 if (!cmd->t_task_cdb) {
1381                         pr_err("Unable to allocate cmd->t_task_cdb"
1382                                 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1383                                 scsi_command_size(cdb),
1384                                 (unsigned long)sizeof(cmd->__t_task_cdb));
1385                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1386                         cmd->scsi_sense_reason =
1387                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1388                         return -ENOMEM;
1389                 }
1390         } else
1391                 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1392         /*
1393          * Copy the original CDB into cmd->
1394          */
1395         memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1396
1397         /*
1398          * Check for an existing UNIT ATTENTION condition
1399          */
1400         if (core_scsi3_ua_check(cmd, cdb) < 0) {
1401                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1402                 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
1403                 return -EINVAL;
1404         }
1405
1406         ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
1407         if (ret != 0) {
1408                 /*
1409                  * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
1410                  * The ALUA additional sense code qualifier (ASCQ) is determined
1411                  * by the ALUA primary or secondary access state..
1412                  */
1413                 if (ret > 0) {
1414                         pr_debug("[%s]: ALUA TG Port not available, "
1415                                 "SenseKey: NOT_READY, ASC/ASCQ: "
1416                                 "0x04/0x%02x\n",
1417                                 cmd->se_tfo->get_fabric_name(), alua_ascq);
1418
1419                         transport_set_sense_codes(cmd, 0x04, alua_ascq);
1420                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1421                         cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
1422                         return -EINVAL;
1423                 }
1424                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1425                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1426                 return -EINVAL;
1427         }
1428
1429         /*
1430          * Check status for SPC-3 Persistent Reservations
1431          */
1432         if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) {
1433                 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
1434                                         cmd, cdb, pr_reg_type) != 0) {
1435                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1436                         cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
1437                         cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1438                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
1439                         return -EBUSY;
1440                 }
1441                 /*
1442                  * This means the CDB is allowed for the SCSI Initiator port
1443                  * when said port is *NOT* holding the legacy SPC-2 or
1444                  * SPC-3 Persistent Reservation.
1445                  */
1446         }
1447
1448         ret = cmd->se_dev->transport->parse_cdb(cmd);
1449         if (ret < 0)
1450                 return ret;
1451
1452         spin_lock_irqsave(&cmd->t_state_lock, flags);
1453         cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1454         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1455
1456         /*
1457          * Check for SAM Task Attribute Emulation
1458          */
1459         if (transport_check_alloc_task_attr(cmd) < 0) {
1460                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1461                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1462                 return -EINVAL;
1463         }
1464         spin_lock(&cmd->se_lun->lun_sep_lock);
1465         if (cmd->se_lun->lun_sep)
1466                 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1467         spin_unlock(&cmd->se_lun->lun_sep_lock);
1468         return 0;
1469 }
1470 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1471
1472 /*
1473  * Used by fabric module frontends to queue tasks directly.
1474  * Many only be used from process context only
1475  */
1476 int transport_handle_cdb_direct(
1477         struct se_cmd *cmd)
1478 {
1479         int ret;
1480
1481         if (!cmd->se_lun) {
1482                 dump_stack();
1483                 pr_err("cmd->se_lun is NULL\n");
1484                 return -EINVAL;
1485         }
1486         if (in_interrupt()) {
1487                 dump_stack();
1488                 pr_err("transport_generic_handle_cdb cannot be called"
1489                                 " from interrupt context\n");
1490                 return -EINVAL;
1491         }
1492         /*
1493          * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following
1494          * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1495          * in existing usage to ensure that outstanding descriptors are handled
1496          * correctly during shutdown via transport_wait_for_tasks()
1497          *
1498          * Also, we don't take cmd->t_state_lock here as we only expect
1499          * this to be called for initial descriptor submission.
1500          */
1501         cmd->t_state = TRANSPORT_NEW_CMD;
1502         cmd->transport_state |= CMD_T_ACTIVE;
1503
1504         /*
1505          * transport_generic_new_cmd() is already handling QUEUE_FULL,
1506          * so follow TRANSPORT_NEW_CMD processing thread context usage
1507          * and call transport_generic_request_failure() if necessary..
1508          */
1509         ret = transport_generic_new_cmd(cmd);
1510         if (ret < 0)
1511                 transport_generic_request_failure(cmd);
1512
1513         return 0;
1514 }
1515 EXPORT_SYMBOL(transport_handle_cdb_direct);
1516
1517 /**
1518  * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1519  *
1520  * @se_cmd: command descriptor to submit
1521  * @se_sess: associated se_sess for endpoint
1522  * @cdb: pointer to SCSI CDB
1523  * @sense: pointer to SCSI sense buffer
1524  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1525  * @data_length: fabric expected data transfer length
1526  * @task_addr: SAM task attribute
1527  * @data_dir: DMA data direction
1528  * @flags: flags for command submission from target_sc_flags_tables
1529  *
1530  * This may only be called from process context, and also currently
1531  * assumes internal allocation of fabric payload buffer by target-core.
1532  **/
1533 void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1534                 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1535                 u32 data_length, int task_attr, int data_dir, int flags)
1536 {
1537         struct se_portal_group *se_tpg;
1538         int rc;
1539
1540         se_tpg = se_sess->se_tpg;
1541         BUG_ON(!se_tpg);
1542         BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1543         BUG_ON(in_interrupt());
1544         /*
1545          * Initialize se_cmd for target operation.  From this point
1546          * exceptions are handled by sending exception status via
1547          * target_core_fabric_ops->queue_status() callback
1548          */
1549         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1550                                 data_length, data_dir, task_attr, sense);
1551         if (flags & TARGET_SCF_UNKNOWN_SIZE)
1552                 se_cmd->unknown_data_length = 1;
1553         /*
1554          * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1555          * se_sess->sess_cmd_list.  A second kref_get here is necessary
1556          * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1557          * kref_put() to happen during fabric packet acknowledgement.
1558          */
1559         target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1560         /*
1561          * Signal bidirectional data payloads to target-core
1562          */
1563         if (flags & TARGET_SCF_BIDI_OP)
1564                 se_cmd->se_cmd_flags |= SCF_BIDI;
1565         /*
1566          * Locate se_lun pointer and attach it to struct se_cmd
1567          */
1568         if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1569                 transport_send_check_condition_and_sense(se_cmd,
1570                                 se_cmd->scsi_sense_reason, 0);
1571                 target_put_sess_cmd(se_sess, se_cmd);
1572                 return;
1573         }
1574
1575         rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1576         if (rc != 0) {
1577                 transport_generic_request_failure(se_cmd);
1578                 return;
1579         }
1580
1581         /*
1582          * Check if we need to delay processing because of ALUA
1583          * Active/NonOptimized primary access state..
1584          */
1585         core_alua_check_nonop_delay(se_cmd);
1586
1587         /*
1588          * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1589          * for immediate execution of READs, otherwise wait for
1590          * transport_generic_handle_data() to be called for WRITEs
1591          * when fabric has filled the incoming buffer.
1592          */
1593         transport_handle_cdb_direct(se_cmd);
1594         return;
1595 }
1596 EXPORT_SYMBOL(target_submit_cmd);
1597
1598 static void target_complete_tmr_failure(struct work_struct *work)
1599 {
1600         struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1601
1602         se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1603         se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1604         transport_generic_free_cmd(se_cmd, 0);
1605 }
1606
1607 /**
1608  * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1609  *                     for TMR CDBs
1610  *
1611  * @se_cmd: command descriptor to submit
1612  * @se_sess: associated se_sess for endpoint
1613  * @sense: pointer to SCSI sense buffer
1614  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1615  * @fabric_context: fabric context for TMR req
1616  * @tm_type: Type of TM request
1617  * @gfp: gfp type for caller
1618  * @tag: referenced task tag for TMR_ABORT_TASK
1619  * @flags: submit cmd flags
1620  *
1621  * Callable from all contexts.
1622  **/
1623
1624 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1625                 unsigned char *sense, u32 unpacked_lun,
1626                 void *fabric_tmr_ptr, unsigned char tm_type,
1627                 gfp_t gfp, unsigned int tag, int flags)
1628 {
1629         struct se_portal_group *se_tpg;
1630         int ret;
1631
1632         se_tpg = se_sess->se_tpg;
1633         BUG_ON(!se_tpg);
1634
1635         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1636                               0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1637         /*
1638          * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1639          * allocation failure.
1640          */
1641         ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1642         if (ret < 0)
1643                 return -ENOMEM;
1644
1645         if (tm_type == TMR_ABORT_TASK)
1646                 se_cmd->se_tmr_req->ref_task_tag = tag;
1647
1648         /* See target_submit_cmd for commentary */
1649         target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1650
1651         ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1652         if (ret) {
1653                 /*
1654                  * For callback during failure handling, push this work off
1655                  * to process context with TMR_LUN_DOES_NOT_EXIST status.
1656                  */
1657                 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1658                 schedule_work(&se_cmd->work);
1659                 return 0;
1660         }
1661         transport_generic_handle_tmr(se_cmd);
1662         return 0;
1663 }
1664 EXPORT_SYMBOL(target_submit_tmr);
1665
1666 /*
1667  * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1668  * to  queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1669  * complete setup in TCM process context w/ TFO->new_cmd_map().
1670  */
1671 int transport_generic_handle_cdb_map(
1672         struct se_cmd *cmd)
1673 {
1674         if (!cmd->se_lun) {
1675                 dump_stack();
1676                 pr_err("cmd->se_lun is NULL\n");
1677                 return -EINVAL;
1678         }
1679
1680         transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
1681         return 0;
1682 }
1683 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1684
1685 /*      transport_generic_handle_data():
1686  *
1687  *
1688  */
1689 int transport_generic_handle_data(
1690         struct se_cmd *cmd)
1691 {
1692         /*
1693          * For the software fabric case, then we assume the nexus is being
1694          * failed/shutdown when signals are pending from the kthread context
1695          * caller, so we return a failure.  For the HW target mode case running
1696          * in interrupt code, the signal_pending() check is skipped.
1697          */
1698         if (!in_interrupt() && signal_pending(current))
1699                 return -EPERM;
1700         /*
1701          * If the received CDB has aleady been ABORTED by the generic
1702          * target engine, we now call transport_check_aborted_status()
1703          * to queue any delated TASK_ABORTED status for the received CDB to the
1704          * fabric module as we are expecting no further incoming DATA OUT
1705          * sequences at this point.
1706          */
1707         if (transport_check_aborted_status(cmd, 1) != 0)
1708                 return 0;
1709
1710         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
1711         return 0;
1712 }
1713 EXPORT_SYMBOL(transport_generic_handle_data);
1714
1715 /*      transport_generic_handle_tmr():
1716  *
1717  *
1718  */
1719 int transport_generic_handle_tmr(
1720         struct se_cmd *cmd)
1721 {
1722         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
1723         return 0;
1724 }
1725 EXPORT_SYMBOL(transport_generic_handle_tmr);
1726
1727 /*
1728  * If the cmd is active, request it to be stopped and sleep until it
1729  * has completed.
1730  */
1731 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1732 {
1733         bool was_active = false;
1734
1735         if (cmd->transport_state & CMD_T_BUSY) {
1736                 cmd->transport_state |= CMD_T_REQUEST_STOP;
1737                 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1738
1739                 pr_debug("cmd %p waiting to complete\n", cmd);
1740                 wait_for_completion(&cmd->task_stop_comp);
1741                 pr_debug("cmd %p stopped successfully\n", cmd);
1742
1743                 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1744                 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1745                 cmd->transport_state &= ~CMD_T_BUSY;
1746                 was_active = true;
1747         }
1748
1749         return was_active;
1750 }
1751
1752 /*
1753  * Handle SAM-esque emulation for generic transport request failures.
1754  */
1755 void transport_generic_request_failure(struct se_cmd *cmd)
1756 {
1757         int ret = 0;
1758
1759         pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1760                 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1761                 cmd->t_task_cdb[0]);
1762         pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1763                 cmd->se_tfo->get_cmd_state(cmd),
1764                 cmd->t_state, cmd->scsi_sense_reason);
1765         pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1766                 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1767                 (cmd->transport_state & CMD_T_STOP) != 0,
1768                 (cmd->transport_state & CMD_T_SENT) != 0);
1769
1770         /*
1771          * For SAM Task Attribute emulation for failed struct se_cmd
1772          */
1773         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1774                 transport_complete_task_attr(cmd);
1775
1776         switch (cmd->scsi_sense_reason) {
1777         case TCM_NON_EXISTENT_LUN:
1778         case TCM_UNSUPPORTED_SCSI_OPCODE:
1779         case TCM_INVALID_CDB_FIELD:
1780         case TCM_INVALID_PARAMETER_LIST:
1781         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1782         case TCM_UNKNOWN_MODE_PAGE:
1783         case TCM_WRITE_PROTECTED:
1784         case TCM_CHECK_CONDITION_ABORT_CMD:
1785         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1786         case TCM_CHECK_CONDITION_NOT_READY:
1787                 break;
1788         case TCM_RESERVATION_CONFLICT:
1789                 /*
1790                  * No SENSE Data payload for this case, set SCSI Status
1791                  * and queue the response to $FABRIC_MOD.
1792                  *
1793                  * Uses linux/include/scsi/scsi.h SAM status codes defs
1794                  */
1795                 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1796                 /*
1797                  * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1798                  * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1799                  * CONFLICT STATUS.
1800                  *
1801                  * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1802                  */
1803                 if (cmd->se_sess &&
1804                     cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1805                         core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1806                                 cmd->orig_fe_lun, 0x2C,
1807                                 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1808
1809                 ret = cmd->se_tfo->queue_status(cmd);
1810                 if (ret == -EAGAIN || ret == -ENOMEM)
1811                         goto queue_full;
1812                 goto check_stop;
1813         default:
1814                 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1815                         cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1816                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1817                 break;
1818         }
1819         /*
1820          * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1821          * make the call to transport_send_check_condition_and_sense()
1822          * directly.  Otherwise expect the fabric to make the call to
1823          * transport_send_check_condition_and_sense() after handling
1824          * possible unsoliticied write data payloads.
1825          */
1826         ret = transport_send_check_condition_and_sense(cmd,
1827                         cmd->scsi_sense_reason, 0);
1828         if (ret == -EAGAIN || ret == -ENOMEM)
1829                 goto queue_full;
1830
1831 check_stop:
1832         transport_lun_remove_cmd(cmd);
1833         if (!transport_cmd_check_stop_to_fabric(cmd))
1834                 ;
1835         return;
1836
1837 queue_full:
1838         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1839         transport_handle_queue_full(cmd, cmd->se_dev);
1840 }
1841 EXPORT_SYMBOL(transport_generic_request_failure);
1842
1843 static void __target_execute_cmd(struct se_cmd *cmd)
1844 {
1845         int error = 0;
1846
1847         spin_lock_irq(&cmd->t_state_lock);
1848         cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1849         spin_unlock_irq(&cmd->t_state_lock);
1850
1851         if (cmd->execute_cmd)
1852                 error = cmd->execute_cmd(cmd);
1853
1854         if (error) {
1855                 spin_lock_irq(&cmd->t_state_lock);
1856                 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1857                 spin_unlock_irq(&cmd->t_state_lock);
1858
1859                 transport_generic_request_failure(cmd);
1860         }
1861 }
1862
1863 static void target_execute_cmd(struct se_cmd *cmd)
1864 {
1865         struct se_device *dev = cmd->se_dev;
1866
1867         /*
1868          * Determine if IOCTL context caller in requesting the stopping of this
1869          * command for LUN shutdown purposes.
1870          */
1871         spin_lock_irq(&cmd->t_state_lock);
1872         if (cmd->transport_state & CMD_T_LUN_STOP) {
1873                 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1874                         __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1875
1876                 cmd->transport_state &= ~CMD_T_ACTIVE;
1877                 spin_unlock_irq(&cmd->t_state_lock);
1878                 complete(&cmd->transport_lun_stop_comp);
1879                 return;
1880         }
1881         /*
1882          * Determine if frontend context caller is requesting the stopping of
1883          * this command for frontend exceptions.
1884          */
1885         if (cmd->transport_state & CMD_T_STOP) {
1886                 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1887                         __func__, __LINE__,
1888                         cmd->se_tfo->get_task_tag(cmd));
1889
1890                 spin_unlock_irq(&cmd->t_state_lock);
1891                 complete(&cmd->t_transport_stop_comp);
1892                 return;
1893         }
1894
1895         cmd->t_state = TRANSPORT_PROCESSING;
1896         spin_unlock_irq(&cmd->t_state_lock);
1897
1898         if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1899                 goto execute;
1900
1901         /*
1902          * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1903          * to allow the passed struct se_cmd list of tasks to the front of the list.
1904          */
1905         switch (cmd->sam_task_attr) {
1906         case MSG_HEAD_TAG:
1907                 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1908                          "se_ordered_id: %u\n",
1909                          cmd->t_task_cdb[0], cmd->se_ordered_id);
1910                 goto execute;
1911         case MSG_ORDERED_TAG:
1912                 atomic_inc(&dev->dev_ordered_sync);
1913                 smp_mb__after_atomic_inc();
1914
1915                 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1916                          " se_ordered_id: %u\n",
1917                          cmd->t_task_cdb[0], cmd->se_ordered_id);
1918
1919                 /*
1920                  * Execute an ORDERED command if no other older commands
1921                  * exist that need to be completed first.
1922                  */
1923                 if (!atomic_read(&dev->simple_cmds))
1924                         goto execute;
1925                 break;
1926         default:
1927                 /*
1928                  * For SIMPLE and UNTAGGED Task Attribute commands
1929                  */
1930                 atomic_inc(&dev->simple_cmds);
1931                 smp_mb__after_atomic_inc();
1932                 break;
1933         }
1934
1935         if (atomic_read(&dev->dev_ordered_sync) != 0) {
1936                 spin_lock(&dev->delayed_cmd_lock);
1937                 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1938                 spin_unlock(&dev->delayed_cmd_lock);
1939
1940                 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1941                         " delayed CMD list, se_ordered_id: %u\n",
1942                         cmd->t_task_cdb[0], cmd->sam_task_attr,
1943                         cmd->se_ordered_id);
1944                 return;
1945         }
1946
1947 execute:
1948         /*
1949          * Otherwise, no ORDERED task attributes exist..
1950          */
1951         __target_execute_cmd(cmd);
1952 }
1953
1954 /*
1955  * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
1956  */
1957 static int transport_get_sense_data(struct se_cmd *cmd)
1958 {
1959         unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
1960         struct se_device *dev = cmd->se_dev;
1961         unsigned long flags;
1962         u32 offset = 0;
1963
1964         WARN_ON(!cmd->se_lun);
1965
1966         if (!dev)
1967                 return 0;
1968
1969         spin_lock_irqsave(&cmd->t_state_lock, flags);
1970         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
1971                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1972                 return 0;
1973         }
1974
1975         if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
1976                 goto out;
1977
1978         if (!dev->transport->get_sense_buffer) {
1979                 pr_err("dev->transport->get_sense_buffer is NULL\n");
1980                 goto out;
1981         }
1982
1983         sense_buffer = dev->transport->get_sense_buffer(cmd);
1984         if (!sense_buffer) {
1985                 pr_err("ITT 0x%08x cmd %p: Unable to locate"
1986                         " sense buffer for task with sense\n",
1987                         cmd->se_tfo->get_task_tag(cmd), cmd);
1988                 goto out;
1989         }
1990
1991         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1992
1993         offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
1994
1995         memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER);
1996
1997         /* Automatically padded */
1998         cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
1999
2000         pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
2001                 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
2002         return 0;
2003
2004 out:
2005         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2006         return -1;
2007 }
2008
2009 /*
2010  * Process all commands up to the last received ORDERED task attribute which
2011  * requires another blocking boundary
2012  */
2013 static void target_restart_delayed_cmds(struct se_device *dev)
2014 {
2015         for (;;) {
2016                 struct se_cmd *cmd;
2017
2018                 spin_lock(&dev->delayed_cmd_lock);
2019                 if (list_empty(&dev->delayed_cmd_list)) {
2020                         spin_unlock(&dev->delayed_cmd_lock);
2021                         break;
2022                 }
2023
2024                 cmd = list_entry(dev->delayed_cmd_list.next,
2025                                  struct se_cmd, se_delayed_node);
2026                 list_del(&cmd->se_delayed_node);
2027                 spin_unlock(&dev->delayed_cmd_lock);
2028
2029                 __target_execute_cmd(cmd);
2030
2031                 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
2032                         break;
2033         }
2034 }
2035
2036 /*
2037  * Called from I/O completion to determine which dormant/delayed
2038  * and ordered cmds need to have their tasks added to the execution queue.
2039  */
2040 static void transport_complete_task_attr(struct se_cmd *cmd)
2041 {
2042         struct se_device *dev = cmd->se_dev;
2043
2044         if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
2045                 atomic_dec(&dev->simple_cmds);
2046                 smp_mb__after_atomic_dec();
2047                 dev->dev_cur_ordered_id++;
2048                 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
2049                         " SIMPLE: %u\n", dev->dev_cur_ordered_id,
2050                         cmd->se_ordered_id);
2051         } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
2052                 dev->dev_cur_ordered_id++;
2053                 pr_debug("Incremented dev_cur_ordered_id: %u for"
2054                         " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
2055                         cmd->se_ordered_id);
2056         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
2057                 atomic_dec(&dev->dev_ordered_sync);
2058                 smp_mb__after_atomic_dec();
2059
2060                 dev->dev_cur_ordered_id++;
2061                 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
2062                         " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
2063         }
2064
2065         target_restart_delayed_cmds(dev);
2066 }
2067
2068 static void transport_complete_qf(struct se_cmd *cmd)
2069 {
2070         int ret = 0;
2071
2072         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2073                 transport_complete_task_attr(cmd);
2074
2075         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2076                 ret = cmd->se_tfo->queue_status(cmd);
2077                 if (ret)
2078                         goto out;
2079         }
2080
2081         switch (cmd->data_direction) {
2082         case DMA_FROM_DEVICE:
2083                 ret = cmd->se_tfo->queue_data_in(cmd);
2084                 break;
2085         case DMA_TO_DEVICE:
2086                 if (cmd->t_bidi_data_sg) {
2087                         ret = cmd->se_tfo->queue_data_in(cmd);
2088                         if (ret < 0)
2089                                 break;
2090                 }
2091                 /* Fall through for DMA_TO_DEVICE */
2092         case DMA_NONE:
2093                 ret = cmd->se_tfo->queue_status(cmd);
2094                 break;
2095         default:
2096                 break;
2097         }
2098
2099 out:
2100         if (ret < 0) {
2101                 transport_handle_queue_full(cmd, cmd->se_dev);
2102                 return;
2103         }
2104         transport_lun_remove_cmd(cmd);
2105         transport_cmd_check_stop_to_fabric(cmd);
2106 }
2107
2108 static void transport_handle_queue_full(
2109         struct se_cmd *cmd,
2110         struct se_device *dev)
2111 {
2112         spin_lock_irq(&dev->qf_cmd_lock);
2113         list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
2114         atomic_inc(&dev->dev_qf_count);
2115         smp_mb__after_atomic_inc();
2116         spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2117
2118         schedule_work(&cmd->se_dev->qf_work_queue);
2119 }
2120
2121 static void target_complete_ok_work(struct work_struct *work)
2122 {
2123         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2124         int reason = 0, ret;
2125
2126         /*
2127          * Check if we need to move delayed/dormant tasks from cmds on the
2128          * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2129          * Attribute.
2130          */
2131         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2132                 transport_complete_task_attr(cmd);
2133         /*
2134          * Check to schedule QUEUE_FULL work, or execute an existing
2135          * cmd->transport_qf_callback()
2136          */
2137         if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2138                 schedule_work(&cmd->se_dev->qf_work_queue);
2139
2140         /*
2141          * Check if we need to retrieve a sense buffer from
2142          * the struct se_cmd in question.
2143          */
2144         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2145                 if (transport_get_sense_data(cmd) < 0)
2146                         reason = TCM_NON_EXISTENT_LUN;
2147
2148                 if (cmd->scsi_status) {
2149                         ret = transport_send_check_condition_and_sense(
2150                                         cmd, reason, 1);
2151                         if (ret == -EAGAIN || ret == -ENOMEM)
2152                                 goto queue_full;
2153
2154                         transport_lun_remove_cmd(cmd);
2155                         transport_cmd_check_stop_to_fabric(cmd);
2156                         return;
2157                 }
2158         }
2159         /*
2160          * Check for a callback, used by amongst other things
2161          * XDWRITE_READ_10 emulation.
2162          */
2163         if (cmd->transport_complete_callback)
2164                 cmd->transport_complete_callback(cmd);
2165
2166         switch (cmd->data_direction) {
2167         case DMA_FROM_DEVICE:
2168                 spin_lock(&cmd->se_lun->lun_sep_lock);
2169                 if (cmd->se_lun->lun_sep) {
2170                         cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2171                                         cmd->data_length;
2172                 }
2173                 spin_unlock(&cmd->se_lun->lun_sep_lock);
2174
2175                 ret = cmd->se_tfo->queue_data_in(cmd);
2176                 if (ret == -EAGAIN || ret == -ENOMEM)
2177                         goto queue_full;
2178                 break;
2179         case DMA_TO_DEVICE:
2180                 spin_lock(&cmd->se_lun->lun_sep_lock);
2181                 if (cmd->se_lun->lun_sep) {
2182                         cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
2183                                 cmd->data_length;
2184                 }
2185                 spin_unlock(&cmd->se_lun->lun_sep_lock);
2186                 /*
2187                  * Check if we need to send READ payload for BIDI-COMMAND
2188                  */
2189                 if (cmd->t_bidi_data_sg) {
2190                         spin_lock(&cmd->se_lun->lun_sep_lock);
2191                         if (cmd->se_lun->lun_sep) {
2192                                 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2193                                         cmd->data_length;
2194                         }
2195                         spin_unlock(&cmd->se_lun->lun_sep_lock);
2196                         ret = cmd->se_tfo->queue_data_in(cmd);
2197                         if (ret == -EAGAIN || ret == -ENOMEM)
2198                                 goto queue_full;
2199                         break;
2200                 }
2201                 /* Fall through for DMA_TO_DEVICE */
2202         case DMA_NONE:
2203                 ret = cmd->se_tfo->queue_status(cmd);
2204                 if (ret == -EAGAIN || ret == -ENOMEM)
2205                         goto queue_full;
2206                 break;
2207         default:
2208                 break;
2209         }
2210
2211         transport_lun_remove_cmd(cmd);
2212         transport_cmd_check_stop_to_fabric(cmd);
2213         return;
2214
2215 queue_full:
2216         pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2217                 " data_direction: %d\n", cmd, cmd->data_direction);
2218         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2219         transport_handle_queue_full(cmd, cmd->se_dev);
2220 }
2221
2222 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
2223 {
2224         struct scatterlist *sg;
2225         int count;
2226
2227         for_each_sg(sgl, sg, nents, count)
2228                 __free_page(sg_page(sg));
2229
2230         kfree(sgl);
2231 }
2232
2233 static inline void transport_free_pages(struct se_cmd *cmd)
2234 {
2235         if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
2236                 return;
2237
2238         transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2239         cmd->t_data_sg = NULL;
2240         cmd->t_data_nents = 0;
2241
2242         transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2243         cmd->t_bidi_data_sg = NULL;
2244         cmd->t_bidi_data_nents = 0;
2245 }
2246
2247 /**
2248  * transport_release_cmd - free a command
2249  * @cmd:       command to free
2250  *
2251  * This routine unconditionally frees a command, and reference counting
2252  * or list removal must be done in the caller.
2253  */
2254 static void transport_release_cmd(struct se_cmd *cmd)
2255 {
2256         BUG_ON(!cmd->se_tfo);
2257
2258         if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2259                 core_tmr_release_req(cmd->se_tmr_req);
2260         if (cmd->t_task_cdb != cmd->__t_task_cdb)
2261                 kfree(cmd->t_task_cdb);
2262         /*
2263          * If this cmd has been setup with target_get_sess_cmd(), drop
2264          * the kref and call ->release_cmd() in kref callback.
2265          */
2266          if (cmd->check_release != 0) {
2267                 target_put_sess_cmd(cmd->se_sess, cmd);
2268                 return;
2269         }
2270         cmd->se_tfo->release_cmd(cmd);
2271 }
2272
2273 /**
2274  * transport_put_cmd - release a reference to a command
2275  * @cmd:       command to release
2276  *
2277  * This routine releases our reference to the command and frees it if possible.
2278  */
2279 static void transport_put_cmd(struct se_cmd *cmd)
2280 {
2281         unsigned long flags;
2282
2283         spin_lock_irqsave(&cmd->t_state_lock, flags);
2284         if (atomic_read(&cmd->t_fe_count)) {
2285                 if (!atomic_dec_and_test(&cmd->t_fe_count))
2286                         goto out_busy;
2287         }
2288
2289         if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
2290                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2291                 target_remove_from_state_list(cmd);
2292         }
2293         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2294
2295         transport_free_pages(cmd);
2296         transport_release_cmd(cmd);
2297         return;
2298 out_busy:
2299         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2300 }
2301
2302 /*
2303  * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
2304  * allocating in the core.
2305  * @cmd:  Associated se_cmd descriptor
2306  * @mem:  SGL style memory for TCM WRITE / READ
2307  * @sg_mem_num: Number of SGL elements
2308  * @mem_bidi_in: SGL style memory for TCM BIDI READ
2309  * @sg_mem_bidi_num: Number of BIDI READ SGL elements
2310  *
2311  * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2312  * of parameters.
2313  */
2314 int transport_generic_map_mem_to_cmd(
2315         struct se_cmd *cmd,
2316         struct scatterlist *sgl,
2317         u32 sgl_count,
2318         struct scatterlist *sgl_bidi,
2319         u32 sgl_bidi_count)
2320 {
2321         if (!sgl || !sgl_count)
2322                 return 0;
2323
2324         /*
2325          * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2326          * scatterlists already have been set to follow what the fabric
2327          * passes for the original expected data transfer length.
2328          */
2329         if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
2330                 pr_warn("Rejecting SCSI DATA overflow for fabric using"
2331                         " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2332                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2333                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2334                 return -EINVAL;
2335         }
2336
2337         cmd->t_data_sg = sgl;
2338         cmd->t_data_nents = sgl_count;
2339
2340         if (sgl_bidi && sgl_bidi_count) {
2341                 cmd->t_bidi_data_sg = sgl_bidi;
2342                 cmd->t_bidi_data_nents = sgl_bidi_count;
2343         }
2344         cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
2345         return 0;
2346 }
2347 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
2348
2349 void *transport_kmap_data_sg(struct se_cmd *cmd)
2350 {
2351         struct scatterlist *sg = cmd->t_data_sg;
2352         struct page **pages;
2353         int i;
2354
2355         BUG_ON(!sg);
2356         /*
2357          * We need to take into account a possible offset here for fabrics like
2358          * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2359          * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2360          */
2361         if (!cmd->t_data_nents)
2362                 return NULL;
2363         else if (cmd->t_data_nents == 1)
2364                 return kmap(sg_page(sg)) + sg->offset;
2365
2366         /* >1 page. use vmap */
2367         pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2368         if (!pages)
2369                 return NULL;
2370
2371         /* convert sg[] to pages[] */
2372         for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2373                 pages[i] = sg_page(sg);
2374         }
2375
2376         cmd->t_data_vmap = vmap(pages, cmd->t_data_nents,  VM_MAP, PAGE_KERNEL);
2377         kfree(pages);
2378         if (!cmd->t_data_vmap)
2379                 return NULL;
2380
2381         return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2382 }
2383 EXPORT_SYMBOL(transport_kmap_data_sg);
2384
2385 void transport_kunmap_data_sg(struct se_cmd *cmd)
2386 {
2387         if (!cmd->t_data_nents) {
2388                 return;
2389         } else if (cmd->t_data_nents == 1) {
2390                 kunmap(sg_page(cmd->t_data_sg));
2391                 return;
2392         }
2393
2394         vunmap(cmd->t_data_vmap);
2395         cmd->t_data_vmap = NULL;
2396 }
2397 EXPORT_SYMBOL(transport_kunmap_data_sg);
2398
2399 static int
2400 transport_generic_get_mem(struct se_cmd *cmd)
2401 {
2402         u32 length = cmd->data_length;
2403         unsigned int nents;
2404         struct page *page;
2405         gfp_t zero_flag;
2406         int i = 0;
2407
2408         nents = DIV_ROUND_UP(length, PAGE_SIZE);
2409         cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2410         if (!cmd->t_data_sg)
2411                 return -ENOMEM;
2412
2413         cmd->t_data_nents = nents;
2414         sg_init_table(cmd->t_data_sg, nents);
2415
2416         zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
2417
2418         while (length) {
2419                 u32 page_len = min_t(u32, length, PAGE_SIZE);
2420                 page = alloc_page(GFP_KERNEL | zero_flag);
2421                 if (!page)
2422                         goto out;
2423
2424                 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2425                 length -= page_len;
2426                 i++;
2427         }
2428         return 0;
2429
2430 out:
2431         while (i >= 0) {
2432                 __free_page(sg_page(&cmd->t_data_sg[i]));
2433                 i--;
2434         }
2435         kfree(cmd->t_data_sg);
2436         cmd->t_data_sg = NULL;
2437         return -ENOMEM;
2438 }
2439
2440 /*
2441  * Allocate any required resources to execute the command.  For writes we
2442  * might not have the payload yet, so notify the fabric via a call to
2443  * ->write_pending instead. Otherwise place it on the execution queue.
2444  */
2445 int transport_generic_new_cmd(struct se_cmd *cmd)
2446 {
2447         int ret = 0;
2448
2449         /*
2450          * Determine is the TCM fabric module has already allocated physical
2451          * memory, and is directly calling transport_generic_map_mem_to_cmd()
2452          * beforehand.
2453          */
2454         if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2455             cmd->data_length) {
2456                 ret = transport_generic_get_mem(cmd);
2457                 if (ret < 0)
2458                         goto out_fail;
2459         }
2460
2461         /* Workaround for handling zero-length control CDBs */
2462         if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->data_length) {
2463                 spin_lock_irq(&cmd->t_state_lock);
2464                 cmd->t_state = TRANSPORT_COMPLETE;
2465                 cmd->transport_state |= CMD_T_ACTIVE;
2466                 spin_unlock_irq(&cmd->t_state_lock);
2467
2468                 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
2469                         u8 ua_asc = 0, ua_ascq = 0;
2470
2471                         core_scsi3_ua_clear_for_request_sense(cmd,
2472                                         &ua_asc, &ua_ascq);
2473                 }
2474
2475                 INIT_WORK(&cmd->work, target_complete_ok_work);
2476                 queue_work(target_completion_wq, &cmd->work);
2477                 return 0;
2478         }
2479
2480         atomic_inc(&cmd->t_fe_count);
2481
2482         /*
2483          * For WRITEs, let the fabric know its buffer is ready.
2484          *
2485          * The command will be added to the execution queue after its write
2486          * data has arrived.
2487          *
2488          * Everything else but a WRITE, add the command to the execution queue.
2489          */
2490         target_add_to_state_list(cmd);
2491         if (cmd->data_direction == DMA_TO_DEVICE)
2492                 return transport_generic_write_pending(cmd);
2493         target_execute_cmd(cmd);
2494         return 0;
2495
2496 out_fail:
2497         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2498         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2499         return -EINVAL;
2500 }
2501 EXPORT_SYMBOL(transport_generic_new_cmd);
2502
2503 /*      transport_generic_process_write():
2504  *
2505  *
2506  */
2507 void transport_generic_process_write(struct se_cmd *cmd)
2508 {
2509         target_execute_cmd(cmd);
2510 }
2511 EXPORT_SYMBOL(transport_generic_process_write);
2512
2513 static void transport_write_pending_qf(struct se_cmd *cmd)
2514 {
2515         int ret;
2516
2517         ret = cmd->se_tfo->write_pending(cmd);
2518         if (ret == -EAGAIN || ret == -ENOMEM) {
2519                 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2520                          cmd);
2521                 transport_handle_queue_full(cmd, cmd->se_dev);
2522         }
2523 }
2524
2525 static int transport_generic_write_pending(struct se_cmd *cmd)
2526 {
2527         unsigned long flags;
2528         int ret;
2529
2530         spin_lock_irqsave(&cmd->t_state_lock, flags);
2531         cmd->t_state = TRANSPORT_WRITE_PENDING;
2532         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2533
2534         /*
2535          * Clear the se_cmd for WRITE_PENDING status in order to set
2536          * CMD_T_ACTIVE so that transport_generic_handle_data can be called
2537          * from HW target mode interrupt code.  This is safe to be called
2538          * with remove_from_lists false before the cmd->se_tfo->write_pending
2539          * because the se_cmd->se_lun pointer is not being cleared.
2540          */
2541         transport_cmd_check_stop(cmd, false);
2542
2543         /*
2544          * Call the fabric write_pending function here to let the
2545          * frontend know that WRITE buffers are ready.
2546          */
2547         ret = cmd->se_tfo->write_pending(cmd);
2548         if (ret == -EAGAIN || ret == -ENOMEM)
2549                 goto queue_full;
2550         else if (ret < 0)
2551                 return ret;
2552
2553         return 1;
2554
2555 queue_full:
2556         pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2557         cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2558         transport_handle_queue_full(cmd, cmd->se_dev);
2559         return 0;
2560 }
2561
2562 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2563 {
2564         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2565                 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2566                          transport_wait_for_tasks(cmd);
2567
2568                 transport_release_cmd(cmd);
2569         } else {
2570                 if (wait_for_tasks)
2571                         transport_wait_for_tasks(cmd);
2572
2573                 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2574
2575                 if (cmd->se_lun)
2576                         transport_lun_remove_cmd(cmd);
2577
2578                 transport_put_cmd(cmd);
2579         }
2580 }
2581 EXPORT_SYMBOL(transport_generic_free_cmd);
2582
2583 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2584  * @se_sess:    session to reference
2585  * @se_cmd:     command descriptor to add
2586  * @ack_kref:   Signal that fabric will perform an ack target_put_sess_cmd()
2587  */
2588 void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2589                         bool ack_kref)
2590 {
2591         unsigned long flags;
2592
2593         kref_init(&se_cmd->cmd_kref);
2594         /*
2595          * Add a second kref if the fabric caller is expecting to handle
2596          * fabric acknowledgement that requires two target_put_sess_cmd()
2597          * invocations before se_cmd descriptor release.
2598          */
2599         if (ack_kref == true) {
2600                 kref_get(&se_cmd->cmd_kref);
2601                 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2602         }
2603
2604         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2605         list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2606         se_cmd->check_release = 1;
2607         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2608 }
2609 EXPORT_SYMBOL(target_get_sess_cmd);
2610
2611 static void target_release_cmd_kref(struct kref *kref)
2612 {
2613         struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2614         struct se_session *se_sess = se_cmd->se_sess;
2615         unsigned long flags;
2616
2617         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2618         if (list_empty(&se_cmd->se_cmd_list)) {
2619                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2620                 se_cmd->se_tfo->release_cmd(se_cmd);
2621                 return;
2622         }
2623         if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2624                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2625                 complete(&se_cmd->cmd_wait_comp);
2626                 return;
2627         }
2628         list_del(&se_cmd->se_cmd_list);
2629         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2630
2631         se_cmd->se_tfo->release_cmd(se_cmd);
2632 }
2633
2634 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2635  * @se_sess:    session to reference
2636  * @se_cmd:     command descriptor to drop
2637  */
2638 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2639 {
2640         return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
2641 }
2642 EXPORT_SYMBOL(target_put_sess_cmd);
2643
2644 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
2645  * @se_sess:    session to split
2646  */
2647 void target_splice_sess_cmd_list(struct se_session *se_sess)
2648 {
2649         struct se_cmd *se_cmd;
2650         unsigned long flags;
2651
2652         WARN_ON(!list_empty(&se_sess->sess_wait_list));
2653         INIT_LIST_HEAD(&se_sess->sess_wait_list);
2654
2655         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2656         se_sess->sess_tearing_down = 1;
2657
2658         list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
2659
2660         list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
2661                 se_cmd->cmd_wait_set = 1;
2662
2663         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2664 }
2665 EXPORT_SYMBOL(target_splice_sess_cmd_list);
2666
2667 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2668  * @se_sess:    session to wait for active I/O
2669  * @wait_for_tasks:     Make extra transport_wait_for_tasks call
2670  */
2671 void target_wait_for_sess_cmds(
2672         struct se_session *se_sess,
2673         int wait_for_tasks)
2674 {
2675         struct se_cmd *se_cmd, *tmp_cmd;
2676         bool rc = false;
2677
2678         list_for_each_entry_safe(se_cmd, tmp_cmd,
2679                                 &se_sess->sess_wait_list, se_cmd_list) {
2680                 list_del(&se_cmd->se_cmd_list);
2681
2682                 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2683                         " %d\n", se_cmd, se_cmd->t_state,
2684                         se_cmd->se_tfo->get_cmd_state(se_cmd));
2685
2686                 if (wait_for_tasks) {
2687                         pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2688                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2689                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
2690
2691                         rc = transport_wait_for_tasks(se_cmd);
2692
2693                         pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2694                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2695                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
2696                 }
2697
2698                 if (!rc) {
2699                         wait_for_completion(&se_cmd->cmd_wait_comp);
2700                         pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2701                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2702                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
2703                 }
2704
2705                 se_cmd->se_tfo->release_cmd(se_cmd);
2706         }
2707 }
2708 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2709
2710 /*      transport_lun_wait_for_tasks():
2711  *
2712  *      Called from ConfigFS context to stop the passed struct se_cmd to allow
2713  *      an struct se_lun to be successfully shutdown.
2714  */
2715 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2716 {
2717         unsigned long flags;
2718         int ret = 0;
2719
2720         /*
2721          * If the frontend has already requested this struct se_cmd to
2722          * be stopped, we can safely ignore this struct se_cmd.
2723          */
2724         spin_lock_irqsave(&cmd->t_state_lock, flags);
2725         if (cmd->transport_state & CMD_T_STOP) {
2726                 cmd->transport_state &= ~CMD_T_LUN_STOP;
2727
2728                 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2729                          cmd->se_tfo->get_task_tag(cmd));
2730                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2731                 transport_cmd_check_stop(cmd, false);
2732                 return -EPERM;
2733         }
2734         cmd->transport_state |= CMD_T_LUN_FE_STOP;
2735         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2736
2737         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
2738
2739         // XXX: audit task_flags checks.
2740         spin_lock_irqsave(&cmd->t_state_lock, flags);
2741         if ((cmd->transport_state & CMD_T_BUSY) &&
2742             (cmd->transport_state & CMD_T_SENT)) {
2743                 if (!target_stop_cmd(cmd, &flags))
2744                         ret++;
2745         }
2746         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2747
2748         pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2749                         " %d\n", cmd, ret);
2750         if (!ret) {
2751                 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
2752                                 cmd->se_tfo->get_task_tag(cmd));
2753                 wait_for_completion(&cmd->transport_lun_stop_comp);
2754                 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
2755                                 cmd->se_tfo->get_task_tag(cmd));
2756         }
2757         transport_remove_cmd_from_queue(cmd);
2758
2759         return 0;
2760 }
2761
2762 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2763 {
2764         struct se_cmd *cmd = NULL;
2765         unsigned long lun_flags, cmd_flags;
2766         /*
2767          * Do exception processing and return CHECK_CONDITION status to the
2768          * Initiator Port.
2769          */
2770         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2771         while (!list_empty(&lun->lun_cmd_list)) {
2772                 cmd = list_first_entry(&lun->lun_cmd_list,
2773                        struct se_cmd, se_lun_node);
2774                 list_del_init(&cmd->se_lun_node);
2775
2776                 spin_lock(&cmd->t_state_lock);
2777                 pr_debug("SE_LUN[%d] - Setting cmd->transport"
2778                         "_lun_stop for  ITT: 0x%08x\n",
2779                         cmd->se_lun->unpacked_lun,
2780                         cmd->se_tfo->get_task_tag(cmd));
2781                 cmd->transport_state |= CMD_T_LUN_STOP;
2782                 spin_unlock(&cmd->t_state_lock);
2783
2784                 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2785
2786                 if (!cmd->se_lun) {
2787                         pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
2788                                 cmd->se_tfo->get_task_tag(cmd),
2789                                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2790                         BUG();
2791                 }
2792                 /*
2793                  * If the Storage engine still owns the iscsi_cmd_t, determine
2794                  * and/or stop its context.
2795                  */
2796                 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
2797                         "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2798                         cmd->se_tfo->get_task_tag(cmd));
2799
2800                 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
2801                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2802                         continue;
2803                 }
2804
2805                 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
2806                         "_wait_for_tasks(): SUCCESS\n",
2807                         cmd->se_lun->unpacked_lun,
2808                         cmd->se_tfo->get_task_tag(cmd));
2809
2810                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2811                 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
2812                         spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2813                         goto check_cond;
2814                 }
2815                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2816                 target_remove_from_state_list(cmd);
2817                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2818
2819                 /*
2820                  * The Storage engine stopped this struct se_cmd before it was
2821                  * send to the fabric frontend for delivery back to the
2822                  * Initiator Node.  Return this SCSI CDB back with an
2823                  * CHECK_CONDITION status.
2824                  */
2825 check_cond:
2826                 transport_send_check_condition_and_sense(cmd,
2827                                 TCM_NON_EXISTENT_LUN, 0);
2828                 /*
2829                  *  If the fabric frontend is waiting for this iscsi_cmd_t to
2830                  * be released, notify the waiting thread now that LU has
2831                  * finished accessing it.
2832                  */
2833                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2834                 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
2835                         pr_debug("SE_LUN[%d] - Detected FE stop for"
2836                                 " struct se_cmd: %p ITT: 0x%08x\n",
2837                                 lun->unpacked_lun,
2838                                 cmd, cmd->se_tfo->get_task_tag(cmd));
2839
2840                         spin_unlock_irqrestore(&cmd->t_state_lock,
2841                                         cmd_flags);
2842                         transport_cmd_check_stop(cmd, false);
2843                         complete(&cmd->transport_lun_fe_stop_comp);
2844                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2845                         continue;
2846                 }
2847                 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
2848                         lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
2849
2850                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2851                 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2852         }
2853         spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2854 }
2855
2856 static int transport_clear_lun_thread(void *p)
2857 {
2858         struct se_lun *lun = p;
2859
2860         __transport_clear_lun_from_sessions(lun);
2861         complete(&lun->lun_shutdown_comp);
2862
2863         return 0;
2864 }
2865
2866 int transport_clear_lun_from_sessions(struct se_lun *lun)
2867 {
2868         struct task_struct *kt;
2869
2870         kt = kthread_run(transport_clear_lun_thread, lun,
2871                         "tcm_cl_%u", lun->unpacked_lun);
2872         if (IS_ERR(kt)) {
2873                 pr_err("Unable to start clear_lun thread\n");
2874                 return PTR_ERR(kt);
2875         }
2876         wait_for_completion(&lun->lun_shutdown_comp);
2877
2878         return 0;
2879 }
2880
2881 /**
2882  * transport_wait_for_tasks - wait for completion to occur
2883  * @cmd:        command to wait
2884  *
2885  * Called from frontend fabric context to wait for storage engine
2886  * to pause and/or release frontend generated struct se_cmd.
2887  */
2888 bool transport_wait_for_tasks(struct se_cmd *cmd)
2889 {
2890         unsigned long flags;
2891
2892         spin_lock_irqsave(&cmd->t_state_lock, flags);
2893         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2894             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2895                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2896                 return false;
2897         }
2898
2899         if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2900             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2901                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2902                 return false;
2903         }
2904         /*
2905          * If we are already stopped due to an external event (ie: LUN shutdown)
2906          * sleep until the connection can have the passed struct se_cmd back.
2907          * The cmd->transport_lun_stopped_sem will be upped by
2908          * transport_clear_lun_from_sessions() once the ConfigFS context caller
2909          * has completed its operation on the struct se_cmd.
2910          */
2911         if (cmd->transport_state & CMD_T_LUN_STOP) {
2912                 pr_debug("wait_for_tasks: Stopping"
2913                         " wait_for_completion(&cmd->t_tasktransport_lun_fe"
2914                         "_stop_comp); for ITT: 0x%08x\n",
2915                         cmd->se_tfo->get_task_tag(cmd));
2916                 /*
2917                  * There is a special case for WRITES where a FE exception +
2918                  * LUN shutdown means ConfigFS context is still sleeping on
2919                  * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2920                  * We go ahead and up transport_lun_stop_comp just to be sure
2921                  * here.
2922                  */
2923                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2924                 complete(&cmd->transport_lun_stop_comp);
2925                 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2926                 spin_lock_irqsave(&cmd->t_state_lock, flags);
2927
2928                 target_remove_from_state_list(cmd);
2929                 /*
2930                  * At this point, the frontend who was the originator of this
2931                  * struct se_cmd, now owns the structure and can be released through
2932                  * normal means below.
2933                  */
2934                 pr_debug("wait_for_tasks: Stopped"
2935                         " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
2936                         "stop_comp); for ITT: 0x%08x\n",
2937                         cmd->se_tfo->get_task_tag(cmd));
2938
2939                 cmd->transport_state &= ~CMD_T_LUN_STOP;
2940         }
2941
2942         if (!(cmd->transport_state & CMD_T_ACTIVE)) {
2943                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2944                 return false;
2945         }
2946
2947         cmd->transport_state |= CMD_T_STOP;
2948
2949         pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2950                 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2951                 cmd, cmd->se_tfo->get_task_tag(cmd),
2952                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2953
2954         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2955
2956         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
2957
2958         wait_for_completion(&cmd->t_transport_stop_comp);
2959
2960         spin_lock_irqsave(&cmd->t_state_lock, flags);
2961         cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2962
2963         pr_debug("wait_for_tasks: Stopped wait_for_compltion("
2964                 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2965                 cmd->se_tfo->get_task_tag(cmd));
2966
2967         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2968
2969         return true;
2970 }
2971 EXPORT_SYMBOL(transport_wait_for_tasks);
2972
2973 static int transport_get_sense_codes(
2974         struct se_cmd *cmd,
2975         u8 *asc,
2976         u8 *ascq)
2977 {
2978         *asc = cmd->scsi_asc;
2979         *ascq = cmd->scsi_ascq;
2980
2981         return 0;
2982 }
2983
2984 static int transport_set_sense_codes(
2985         struct se_cmd *cmd,
2986         u8 asc,
2987         u8 ascq)
2988 {
2989         cmd->scsi_asc = asc;
2990         cmd->scsi_ascq = ascq;
2991
2992         return 0;
2993 }
2994
2995 int transport_send_check_condition_and_sense(
2996         struct se_cmd *cmd,
2997         u8 reason,
2998         int from_transport)
2999 {
3000         unsigned char *buffer = cmd->sense_buffer;
3001         unsigned long flags;
3002         int offset;
3003         u8 asc = 0, ascq = 0;
3004
3005         spin_lock_irqsave(&cmd->t_state_lock, flags);
3006         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3007                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3008                 return 0;
3009         }
3010         cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
3011         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3012
3013         if (!reason && from_transport)
3014                 goto after_reason;
3015
3016         if (!from_transport)
3017                 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
3018         /*
3019          * Data Segment and SenseLength of the fabric response PDU.
3020          *
3021          * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
3022          * from include/scsi/scsi_cmnd.h
3023          */
3024         offset = cmd->se_tfo->set_fabric_sense_len(cmd,
3025                                 TRANSPORT_SENSE_BUFFER);
3026         /*
3027          * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
3028          * SENSE KEY values from include/scsi/scsi.h
3029          */
3030         switch (reason) {
3031         case TCM_NON_EXISTENT_LUN:
3032                 /* CURRENT ERROR */
3033                 buffer[offset] = 0x70;
3034                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3035                 /* ILLEGAL REQUEST */
3036                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3037                 /* LOGICAL UNIT NOT SUPPORTED */
3038                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
3039                 break;
3040         case TCM_UNSUPPORTED_SCSI_OPCODE:
3041         case TCM_SECTOR_COUNT_TOO_MANY:
3042                 /* CURRENT ERROR */
3043                 buffer[offset] = 0x70;
3044                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3045                 /* ILLEGAL REQUEST */
3046                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3047                 /* INVALID COMMAND OPERATION CODE */
3048                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
3049                 break;
3050         case TCM_UNKNOWN_MODE_PAGE:
3051                 /* CURRENT ERROR */
3052                 buffer[offset] = 0x70;
3053                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3054                 /* ILLEGAL REQUEST */
3055                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3056                 /* INVALID FIELD IN CDB */
3057                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
3058                 break;
3059         case TCM_CHECK_CONDITION_ABORT_CMD:
3060                 /* CURRENT ERROR */
3061                 buffer[offset] = 0x70;
3062                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3063                 /* ABORTED COMMAND */
3064                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
3065                 /* BUS DEVICE RESET FUNCTION OCCURRED */
3066                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
3067                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
3068                 break;
3069         case TCM_INCORRECT_AMOUNT_OF_DATA:
3070                 /* CURRENT ERROR */
3071                 buffer[offset] = 0x70;
3072                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3073                 /* ABORTED COMMAND */
3074                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
3075                 /* WRITE ERROR */
3076                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
3077                 /* NOT ENOUGH UNSOLICITED DATA */
3078                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
3079                 break;
3080         case TCM_INVALID_CDB_FIELD:
3081                 /* CURRENT ERROR */
3082                 buffer[offset] = 0x70;
3083                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3084                 /* ILLEGAL REQUEST */
3085                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3086                 /* INVALID FIELD IN CDB */
3087                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
3088                 break;
3089         case TCM_INVALID_PARAMETER_LIST:
3090                 /* CURRENT ERROR */
3091                 buffer[offset] = 0x70;
3092                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3093                 /* ILLEGAL REQUEST */
3094                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3095                 /* INVALID FIELD IN PARAMETER LIST */
3096                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
3097                 break;
3098         case TCM_UNEXPECTED_UNSOLICITED_DATA:
3099                 /* CURRENT ERROR */
3100                 buffer[offset] = 0x70;
3101                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3102                 /* ABORTED COMMAND */
3103                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
3104                 /* WRITE ERROR */
3105                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
3106                 /* UNEXPECTED_UNSOLICITED_DATA */
3107                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
3108                 break;
3109         case TCM_SERVICE_CRC_ERROR:
3110                 /* CURRENT ERROR */
3111                 buffer[offset] = 0x70;
3112                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3113                 /* ABORTED COMMAND */
3114                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
3115                 /* PROTOCOL SERVICE CRC ERROR */
3116                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
3117                 /* N/A */
3118                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
3119                 break;
3120         case TCM_SNACK_REJECTED:
3121                 /* CURRENT ERROR */
3122                 buffer[offset] = 0x70;
3123                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3124                 /* ABORTED COMMAND */
3125                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
3126                 /* READ ERROR */
3127                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
3128                 /* FAILED RETRANSMISSION REQUEST */
3129                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
3130                 break;
3131         case TCM_WRITE_PROTECTED:
3132                 /* CURRENT ERROR */
3133                 buffer[offset] = 0x70;
3134                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3135                 /* DATA PROTECT */
3136                 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
3137                 /* WRITE PROTECTED */
3138                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
3139                 break;
3140         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
3141                 /* CURRENT ERROR */
3142                 buffer[offset] = 0x70;
3143                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3144                 /* UNIT ATTENTION */
3145                 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
3146                 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
3147                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
3148                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
3149                 break;
3150         case TCM_CHECK_CONDITION_NOT_READY:
3151                 /* CURRENT ERROR */
3152                 buffer[offset] = 0x70;
3153                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3154                 /* Not Ready */
3155                 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
3156                 transport_get_sense_codes(cmd, &asc, &ascq);
3157                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
3158                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
3159                 break;
3160         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
3161         default:
3162                 /* CURRENT ERROR */
3163                 buffer[offset] = 0x70;
3164                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3165                 /* ILLEGAL REQUEST */
3166                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3167                 /* LOGICAL UNIT COMMUNICATION FAILURE */
3168                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
3169                 break;
3170         }
3171         /*
3172          * This code uses linux/include/scsi/scsi.h SAM status codes!
3173          */
3174         cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3175         /*
3176          * Automatically padded, this value is encoded in the fabric's
3177          * data_length response PDU containing the SCSI defined sense data.
3178          */
3179         cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER + offset;
3180
3181 after_reason:
3182         return cmd->se_tfo->queue_status(cmd);
3183 }
3184 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3185
3186 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3187 {
3188         int ret = 0;
3189
3190         if (cmd->transport_state & CMD_T_ABORTED) {
3191                 if (!send_status ||
3192                      (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
3193                         return 1;
3194
3195                 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
3196                         " status for CDB: 0x%02x ITT: 0x%08x\n",
3197                         cmd->t_task_cdb[0],
3198                         cmd->se_tfo->get_task_tag(cmd));
3199
3200                 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
3201                 cmd->se_tfo->queue_status(cmd);
3202                 ret = 1;
3203         }
3204         return ret;
3205 }
3206 EXPORT_SYMBOL(transport_check_aborted_status);
3207
3208 void transport_send_task_abort(struct se_cmd *cmd)
3209 {
3210         unsigned long flags;
3211
3212         spin_lock_irqsave(&cmd->t_state_lock, flags);
3213         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3214                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3215                 return;
3216         }
3217         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3218
3219         /*
3220          * If there are still expected incoming fabric WRITEs, we wait
3221          * until until they have completed before sending a TASK_ABORTED
3222          * response.  This response with TASK_ABORTED status will be
3223          * queued back to fabric module by transport_check_aborted_status().
3224          */
3225         if (cmd->data_direction == DMA_TO_DEVICE) {
3226                 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
3227                         cmd->transport_state |= CMD_T_ABORTED;
3228                         smp_mb__after_atomic_inc();
3229                 }
3230         }
3231         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
3232
3233         pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
3234                 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
3235                 cmd->se_tfo->get_task_tag(cmd));
3236
3237         cmd->se_tfo->queue_status(cmd);
3238 }
3239
3240 static int transport_generic_do_tmr(struct se_cmd *cmd)
3241 {
3242         struct se_device *dev = cmd->se_dev;
3243         struct se_tmr_req *tmr = cmd->se_tmr_req;
3244         int ret;
3245
3246         switch (tmr->function) {
3247         case TMR_ABORT_TASK:
3248                 core_tmr_abort_task(dev, tmr, cmd->se_sess);
3249                 break;
3250         case TMR_ABORT_TASK_SET:
3251         case TMR_CLEAR_ACA:
3252         case TMR_CLEAR_TASK_SET:
3253                 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3254                 break;
3255         case TMR_LUN_RESET:
3256                 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3257                 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3258                                          TMR_FUNCTION_REJECTED;
3259                 break;
3260         case TMR_TARGET_WARM_RESET:
3261                 tmr->response = TMR_FUNCTION_REJECTED;
3262                 break;
3263         case TMR_TARGET_COLD_RESET:
3264                 tmr->response = TMR_FUNCTION_REJECTED;
3265                 break;
3266         default:
3267                 pr_err("Uknown TMR function: 0x%02x.\n",
3268                                 tmr->function);
3269                 tmr->response = TMR_FUNCTION_REJECTED;
3270                 break;
3271         }
3272
3273         cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3274         cmd->se_tfo->queue_tm_rsp(cmd);
3275
3276         transport_cmd_check_stop_to_fabric(cmd);
3277         return 0;
3278 }
3279
3280 /*      transport_processing_thread():
3281  *
3282  *
3283  */
3284 static int transport_processing_thread(void *param)
3285 {
3286         int ret;
3287         struct se_cmd *cmd;
3288         struct se_device *dev = param;
3289
3290         while (!kthread_should_stop()) {
3291                 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
3292                                 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
3293                                 kthread_should_stop());
3294                 if (ret < 0)
3295                         goto out;
3296
3297 get_cmd:
3298                 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
3299                 if (!cmd)
3300                         continue;
3301
3302                 switch (cmd->t_state) {
3303                 case TRANSPORT_NEW_CMD:
3304                         BUG();
3305                         break;
3306                 case TRANSPORT_NEW_CMD_MAP:
3307                         if (!cmd->se_tfo->new_cmd_map) {
3308                                 pr_err("cmd->se_tfo->new_cmd_map is"
3309                                         " NULL for TRANSPORT_NEW_CMD_MAP\n");
3310                                 BUG();
3311                         }
3312                         ret = cmd->se_tfo->new_cmd_map(cmd);
3313                         if (ret < 0) {
3314                                 transport_generic_request_failure(cmd);
3315                                 break;
3316                         }
3317                         ret = transport_generic_new_cmd(cmd);
3318                         if (ret < 0) {
3319                                 transport_generic_request_failure(cmd);
3320                                 break;
3321                         }
3322                         break;
3323                 case TRANSPORT_PROCESS_WRITE:
3324                         transport_generic_process_write(cmd);
3325                         break;
3326                 case TRANSPORT_PROCESS_TMR:
3327                         transport_generic_do_tmr(cmd);
3328                         break;
3329                 case TRANSPORT_COMPLETE_QF_WP:
3330                         transport_write_pending_qf(cmd);
3331                         break;
3332                 case TRANSPORT_COMPLETE_QF_OK:
3333                         transport_complete_qf(cmd);
3334                         break;
3335                 default:
3336                         pr_err("Unknown t_state: %d  for ITT: 0x%08x "
3337                                 "i_state: %d on SE LUN: %u\n",
3338                                 cmd->t_state,
3339                                 cmd->se_tfo->get_task_tag(cmd),
3340                                 cmd->se_tfo->get_cmd_state(cmd),
3341                                 cmd->se_lun->unpacked_lun);
3342                         BUG();
3343                 }
3344
3345                 goto get_cmd;
3346         }
3347
3348 out:
3349         WARN_ON(!list_empty(&dev->state_list));
3350         WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
3351         dev->process_thread = NULL;
3352         return 0;
3353 }