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 int __transport_execute_tasks(struct se_device *dev, struct se_cmd *);
  72 static void transport_complete_task_attr(struct se_cmd *cmd);
  73 static void transport_handle_queue_full(struct se_cmd *cmd,
  74                 struct se_device *dev);
  75 static int transport_generic_get_mem(struct se_cmd *cmd);
  76 static void transport_put_cmd(struct se_cmd *cmd);
  77 static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
  78 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
  79 static void target_complete_ok_work(struct work_struct *work);
  80
  81 int init_se_kmem_caches(void)
  82 {
  83         se_sess_cache = kmem_cache_create("se_sess_cache",
  84                         sizeof(struct se_session), __alignof__(struct se_session),
  85                         0, NULL);
  86         if (!se_sess_cache) {
  87                 pr_err("kmem_cache_create() for struct se_session"
  88                                 " failed\n");
  89                 goto out;
  90         }
  91         se_ua_cache = kmem_cache_create("se_ua_cache",
  92                         sizeof(struct se_ua), __alignof__(struct se_ua),
  93                         0, NULL);
  94         if (!se_ua_cache) {
  95                 pr_err("kmem_cache_create() for struct se_ua failed\n");
  96                 goto out_free_sess_cache;
  97         }
  98         t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
  99                         sizeof(struct t10_pr_registration),
 100                         __alignof__(struct t10_pr_registration), 0, NULL);
 101         if (!t10_pr_reg_cache) {
 102                 pr_err("kmem_cache_create() for struct t10_pr_registration"
 103                                 " failed\n");
 104                 goto out_free_ua_cache;
 105         }
 106         t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
 107                         sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
 108                         0, NULL);
 109         if (!t10_alua_lu_gp_cache) {
 110                 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
 111                                 " failed\n");
 112                 goto out_free_pr_reg_cache;
 113         }
 114         t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
 115                         sizeof(struct t10_alua_lu_gp_member),
 116                         __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
 117         if (!t10_alua_lu_gp_mem_cache) {
 118                 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
 119                                 "cache failed\n");
 120                 goto out_free_lu_gp_cache;
 121         }
 122         t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
 123                         sizeof(struct t10_alua_tg_pt_gp),
 124                         __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
 125         if (!t10_alua_tg_pt_gp_cache) {
 126                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 127                                 "cache failed\n");
 128                 goto out_free_lu_gp_mem_cache;
 129         }
 130         t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
 131                         "t10_alua_tg_pt_gp_mem_cache",
 132                         sizeof(struct t10_alua_tg_pt_gp_member),
 133                         __alignof__(struct t10_alua_tg_pt_gp_member),
 134                         0, NULL);
 135         if (!t10_alua_tg_pt_gp_mem_cache) {
 136                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 137                                 "mem_t failed\n");
 138                 goto out_free_tg_pt_gp_cache;
 139         }
 140
 141         target_completion_wq = alloc_workqueue("target_completion",
 142                                                WQ_MEM_RECLAIM, 0);
 143         if (!target_completion_wq)
 144                 goto out_free_tg_pt_gp_mem_cache;
 145
 146         return 0;
 147
 148 out_free_tg_pt_gp_mem_cache:
 149         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 150 out_free_tg_pt_gp_cache:
 151         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 152 out_free_lu_gp_mem_cache:
 153         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 154 out_free_lu_gp_cache:
 155         kmem_cache_destroy(t10_alua_lu_gp_cache);
 156 out_free_pr_reg_cache:
 157         kmem_cache_destroy(t10_pr_reg_cache);
 158 out_free_ua_cache:
 159         kmem_cache_destroy(se_ua_cache);
 160 out_free_sess_cache:
 161         kmem_cache_destroy(se_sess_cache);
 162 out:
 163         return -ENOMEM;
 164 }
 165
 166 void release_se_kmem_caches(void)
 167 {
 168         destroy_workqueue(target_completion_wq);
 169         kmem_cache_destroy(se_sess_cache);
 170         kmem_cache_destroy(se_ua_cache);
 171         kmem_cache_destroy(t10_pr_reg_cache);
 172         kmem_cache_destroy(t10_alua_lu_gp_cache);
 173         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 174         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 175         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 176 }
 177
 178 /* This code ensures unique mib indexes are handed out. */
 179 static DEFINE_SPINLOCK(scsi_mib_index_lock);
 180 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
 181
 182 /*
 183  * Allocate a new row index for the entry type specified
 184  */
 185 u32 scsi_get_new_index(scsi_index_t type)
 186 {
 187         u32 new_index;
 188
 189         BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
 190
 191         spin_lock(&scsi_mib_index_lock);
 192         new_index = ++scsi_mib_index[type];
 193         spin_unlock(&scsi_mib_index_lock);
 194
 195         return new_index;
 196 }
 197
 198 static void transport_init_queue_obj(struct se_queue_obj *qobj)
 199 {
 200         atomic_set(&qobj->queue_cnt, 0);
 201         INIT_LIST_HEAD(&qobj->qobj_list);
 202         init_waitqueue_head(&qobj->thread_wq);
 203         spin_lock_init(&qobj->cmd_queue_lock);
 204 }
 205
 206 void transport_subsystem_check_init(void)
 207 {
 208         int ret;
 209
 210         if (sub_api_initialized)
 211                 return;
 212
 213         ret = request_module("target_core_iblock");
 214         if (ret != 0)
 215                 pr_err("Unable to load target_core_iblock\n");
 216
 217         ret = request_module("target_core_file");
 218         if (ret != 0)
 219                 pr_err("Unable to load target_core_file\n");
 220
 221         ret = request_module("target_core_pscsi");
 222         if (ret != 0)
 223                 pr_err("Unable to load target_core_pscsi\n");
 224
 225         ret = request_module("target_core_stgt");
 226         if (ret != 0)
 227                 pr_err("Unable to load target_core_stgt\n");
 228
 229         sub_api_initialized = 1;
 230         return;
 231 }
 232
 233 struct se_session *transport_init_session(void)
 234 {
 235         struct se_session *se_sess;
 236
 237         se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
 238         if (!se_sess) {
 239                 pr_err("Unable to allocate struct se_session from"
 240                                 " se_sess_cache\n");
 241                 return ERR_PTR(-ENOMEM);
 242         }
 243         INIT_LIST_HEAD(&se_sess->sess_list);
 244         INIT_LIST_HEAD(&se_sess->sess_acl_list);
 245         INIT_LIST_HEAD(&se_sess->sess_cmd_list);
 246         INIT_LIST_HEAD(&se_sess->sess_wait_list);
 247         spin_lock_init(&se_sess->sess_cmd_lock);
 248         kref_init(&se_sess->sess_kref);
 249
 250         return se_sess;
 251 }
 252 EXPORT_SYMBOL(transport_init_session);
 253
 254 /*
 255  * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
 256  */
 257 void __transport_register_session(
 258         struct se_portal_group *se_tpg,
 259         struct se_node_acl *se_nacl,
 260         struct se_session *se_sess,
 261         void *fabric_sess_ptr)
 262 {
 263         unsigned char buf[PR_REG_ISID_LEN];
 264
 265         se_sess->se_tpg = se_tpg;
 266         se_sess->fabric_sess_ptr = fabric_sess_ptr;
 267         /*
 268          * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
 269          *
 270          * Only set for struct se_session's that will actually be moving I/O.
 271          * eg: *NOT* discovery sessions.
 272          */
 273         if (se_nacl) {
 274                 /*
 275                  * If the fabric module supports an ISID based TransportID,
 276                  * save this value in binary from the fabric I_T Nexus now.
 277                  */
 278                 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
 279                         memset(&buf[0], 0, PR_REG_ISID_LEN);
 280                         se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
 281                                         &buf[0], PR_REG_ISID_LEN);
 282                         se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
 283                 }
 284                 kref_get(&se_nacl->acl_kref);
 285
 286                 spin_lock_irq(&se_nacl->nacl_sess_lock);
 287                 /*
 288                  * The se_nacl->nacl_sess pointer will be set to the
 289                  * last active I_T Nexus for each struct se_node_acl.
 290                  */
 291                 se_nacl->nacl_sess = se_sess;
 292
 293                 list_add_tail(&se_sess->sess_acl_list,
 294                               &se_nacl->acl_sess_list);
 295                 spin_unlock_irq(&se_nacl->nacl_sess_lock);
 296         }
 297         list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
 298
 299         pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
 300                 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
 301 }
 302 EXPORT_SYMBOL(__transport_register_session);
 303
 304 void transport_register_session(
 305         struct se_portal_group *se_tpg,
 306         struct se_node_acl *se_nacl,
 307         struct se_session *se_sess,
 308         void *fabric_sess_ptr)
 309 {
 310         unsigned long flags;
 311
 312         spin_lock_irqsave(&se_tpg->session_lock, flags);
 313         __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
 314         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 315 }
 316 EXPORT_SYMBOL(transport_register_session);
 317
 318 void target_release_session(struct kref *kref)
 319 {
 320         struct se_session *se_sess = container_of(kref,
 321                         struct se_session, sess_kref);
 322         struct se_portal_group *se_tpg = se_sess->se_tpg;
 323
 324         se_tpg->se_tpg_tfo->close_session(se_sess);
 325 }
 326
 327 void target_get_session(struct se_session *se_sess)
 328 {
 329         kref_get(&se_sess->sess_kref);
 330 }
 331 EXPORT_SYMBOL(target_get_session);
 332
 333 void target_put_session(struct se_session *se_sess)
 334 {
 335         struct se_portal_group *tpg = se_sess->se_tpg;
 336
 337         if (tpg->se_tpg_tfo->put_session != NULL) {
 338                 tpg->se_tpg_tfo->put_session(se_sess);
 339                 return;
 340         }
 341         kref_put(&se_sess->sess_kref, target_release_session);
 342 }
 343 EXPORT_SYMBOL(target_put_session);
 344
 345 static void target_complete_nacl(struct kref *kref)
 346 {
 347         struct se_node_acl *nacl = container_of(kref,
 348                                 struct se_node_acl, acl_kref);
 349
 350         complete(&nacl->acl_free_comp);
 351 }
 352
 353 void target_put_nacl(struct se_node_acl *nacl)
 354 {
 355         kref_put(&nacl->acl_kref, target_complete_nacl);
 356 }
 357
 358 void transport_deregister_session_configfs(struct se_session *se_sess)
 359 {
 360         struct se_node_acl *se_nacl;
 361         unsigned long flags;
 362         /*
 363          * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
 364          */
 365         se_nacl = se_sess->se_node_acl;
 366         if (se_nacl) {
 367                 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
 368                 if (se_nacl->acl_stop == 0)
 369                         list_del(&se_sess->sess_acl_list);
 370                 /*
 371                  * If the session list is empty, then clear the pointer.
 372                  * Otherwise, set the struct se_session pointer from the tail
 373                  * element of the per struct se_node_acl active session list.
 374                  */
 375                 if (list_empty(&se_nacl->acl_sess_list))
 376                         se_nacl->nacl_sess = NULL;
 377                 else {
 378                         se_nacl->nacl_sess = container_of(
 379                                         se_nacl->acl_sess_list.prev,
 380                                         struct se_session, sess_acl_list);
 381                 }
 382                 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
 383         }
 384 }
 385 EXPORT_SYMBOL(transport_deregister_session_configfs);
 386
 387 void transport_free_session(struct se_session *se_sess)
 388 {
 389         kmem_cache_free(se_sess_cache, se_sess);
 390 }
 391 EXPORT_SYMBOL(transport_free_session);
 392
 393 void transport_deregister_session(struct se_session *se_sess)
 394 {
 395         struct se_portal_group *se_tpg = se_sess->se_tpg;
 396         struct target_core_fabric_ops *se_tfo;
 397         struct se_node_acl *se_nacl;
 398         unsigned long flags;
 399         bool comp_nacl = true;
 400
 401         if (!se_tpg) {
 402                 transport_free_session(se_sess);
 403                 return;
 404         }
 405         se_tfo = se_tpg->se_tpg_tfo;
 406
 407         spin_lock_irqsave(&se_tpg->session_lock, flags);
 408         list_del(&se_sess->sess_list);
 409         se_sess->se_tpg = NULL;
 410         se_sess->fabric_sess_ptr = NULL;
 411         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 412
 413         /*
 414          * Determine if we need to do extra work for this initiator node's
 415          * struct se_node_acl if it had been previously dynamically generated.
 416          */
 417         se_nacl = se_sess->se_node_acl;
 418
 419         spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 420         if (se_nacl && se_nacl->dynamic_node_acl) {
 421                 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
 422                         list_del(&se_nacl->acl_list);
 423                         se_tpg->num_node_acls--;
 424                         spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 425                         core_tpg_wait_for_nacl_pr_ref(se_nacl);
 426                         core_free_device_list_for_node(se_nacl, se_tpg);
 427                         se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
 428
 429                         comp_nacl = false;
 430                         spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 431                 }
 432         }
 433         spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 434
 435         pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
 436                 se_tpg->se_tpg_tfo->get_fabric_name());
 437         /*
 438          * If last kref is dropping now for an explict NodeACL, awake sleeping
 439          * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
 440          * removal context.
 441          */
 442         if (se_nacl && comp_nacl == true)
 443                 target_put_nacl(se_nacl);
 444
 445         transport_free_session(se_sess);
 446 }
 447 EXPORT_SYMBOL(transport_deregister_session);
 448
 449 /*
 450  * Called with cmd->t_state_lock held.
 451  */
 452 static void target_remove_from_state_list(struct se_cmd *cmd)
 453 {
 454         struct se_device *dev = cmd->se_dev;
 455         unsigned long flags;
 456
 457         if (!dev)
 458                 return;
 459
 460         if (cmd->transport_state & CMD_T_BUSY)
 461                 return;
 462
 463         spin_lock_irqsave(&dev->execute_task_lock, flags);
 464         if (cmd->state_active) {
 465                 list_del(&cmd->state_list);
 466                 cmd->state_active = false;
 467         }
 468         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 469 }
 470
 471 /*      transport_cmd_check_stop():
 472  *
 473  *      'transport_off = 1' determines if CMD_T_ACTIVE should be cleared.
 474  *      'transport_off = 2' determines if task_dev_state should be removed.
 475  *
 476  *      A non-zero u8 t_state sets cmd->t_state.
 477  *      Returns 1 when command is stopped, else 0.
 478  */
 479 static int transport_cmd_check_stop(
 480         struct se_cmd *cmd,
 481         int transport_off,
 482         u8 t_state)
 483 {
 484         unsigned long flags;
 485
 486         spin_lock_irqsave(&cmd->t_state_lock, flags);
 487         /*
 488          * Determine if IOCTL context caller in requesting the stopping of this
 489          * command for LUN shutdown purposes.
 490          */
 491         if (cmd->transport_state & CMD_T_LUN_STOP) {
 492                 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
 493                         __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
 494
 495                 cmd->transport_state &= ~CMD_T_ACTIVE;
 496                 if (transport_off == 2)
 497                         target_remove_from_state_list(cmd);
 498                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 499
 500                 complete(&cmd->transport_lun_stop_comp);
 501                 return 1;
 502         }
 503         /*
 504          * Determine if frontend context caller is requesting the stopping of
 505          * this command for frontend exceptions.
 506          */
 507         if (cmd->transport_state & CMD_T_STOP) {
 508                 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
 509                         __func__, __LINE__,
 510                         cmd->se_tfo->get_task_tag(cmd));
 511
 512                 if (transport_off == 2)
 513                         target_remove_from_state_list(cmd);
 514
 515                 /*
 516                  * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
 517                  * to FE.
 518                  */
 519                 if (transport_off == 2)
 520                         cmd->se_lun = NULL;
 521                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 522
 523                 complete(&cmd->t_transport_stop_comp);
 524                 return 1;
 525         }
 526         if (transport_off) {
 527                 cmd->transport_state &= ~CMD_T_ACTIVE;
 528                 if (transport_off == 2) {
 529                         target_remove_from_state_list(cmd);
 530                         /*
 531                          * Clear struct se_cmd->se_lun before the transport_off == 2
 532                          * handoff to fabric module.
 533                          */
 534                         cmd->se_lun = NULL;
 535                         /*
 536                          * Some fabric modules like tcm_loop can release
 537                          * their internally allocated I/O reference now and
 538                          * struct se_cmd now.
 539                          *
 540                          * Fabric modules are expected to return '1' here if the
 541                          * se_cmd being passed is released at this point,
 542                          * or zero if not being released.
 543                          */
 544                         if (cmd->se_tfo->check_stop_free != NULL) {
 545                                 spin_unlock_irqrestore(
 546                                         &cmd->t_state_lock, flags);
 547
 548                                 return cmd->se_tfo->check_stop_free(cmd);
 549                         }
 550                 }
 551                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 552
 553                 return 0;
 554         } else if (t_state)
 555                 cmd->t_state = t_state;
 556         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 557
 558         return 0;
 559 }
 560
 561 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
 562 {
 563         return transport_cmd_check_stop(cmd, 2, 0);
 564 }
 565
 566 static void transport_lun_remove_cmd(struct se_cmd *cmd)
 567 {
 568         struct se_lun *lun = cmd->se_lun;
 569         unsigned long flags;
 570
 571         if (!lun)
 572                 return;
 573
 574         spin_lock_irqsave(&cmd->t_state_lock, flags);
 575         if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
 576                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
 577                 target_remove_from_state_list(cmd);
 578         }
 579         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 580
 581         spin_lock_irqsave(&lun->lun_cmd_lock, flags);
 582         if (!list_empty(&cmd->se_lun_node))
 583                 list_del_init(&cmd->se_lun_node);
 584         spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
 585 }
 586
 587 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
 588 {
 589         if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
 590                 transport_lun_remove_cmd(cmd);
 591
 592         if (transport_cmd_check_stop_to_fabric(cmd))
 593                 return;
 594         if (remove) {
 595                 transport_remove_cmd_from_queue(cmd);
 596                 transport_put_cmd(cmd);
 597         }
 598 }
 599
 600 static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
 601                 bool at_head)
 602 {
 603         struct se_device *dev = cmd->se_dev;
 604         struct se_queue_obj *qobj = &dev->dev_queue_obj;
 605         unsigned long flags;
 606
 607         if (t_state) {
 608                 spin_lock_irqsave(&cmd->t_state_lock, flags);
 609                 cmd->t_state = t_state;
 610                 cmd->transport_state |= CMD_T_ACTIVE;
 611                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 612         }
 613
 614         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 615
 616         /* If the cmd is already on the list, remove it before we add it */
 617         if (!list_empty(&cmd->se_queue_node))
 618                 list_del(&cmd->se_queue_node);
 619         else
 620                 atomic_inc(&qobj->queue_cnt);
 621
 622         if (at_head)
 623                 list_add(&cmd->se_queue_node, &qobj->qobj_list);
 624         else
 625                 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
 626         cmd->transport_state |= CMD_T_QUEUED;
 627         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 628
 629         wake_up_interruptible(&qobj->thread_wq);
 630 }
 631
 632 static struct se_cmd *
 633 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
 634 {
 635         struct se_cmd *cmd;
 636         unsigned long flags;
 637
 638         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 639         if (list_empty(&qobj->qobj_list)) {
 640                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 641                 return NULL;
 642         }
 643         cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
 644
 645         cmd->transport_state &= ~CMD_T_QUEUED;
 646         list_del_init(&cmd->se_queue_node);
 647         atomic_dec(&qobj->queue_cnt);
 648         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 649
 650         return cmd;
 651 }
 652
 653 static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
 654 {
 655         struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
 656         unsigned long flags;
 657
 658         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 659         if (!(cmd->transport_state & CMD_T_QUEUED)) {
 660                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 661                 return;
 662         }
 663         cmd->transport_state &= ~CMD_T_QUEUED;
 664         atomic_dec(&qobj->queue_cnt);
 665         list_del_init(&cmd->se_queue_node);
 666         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 667 }
 668
 669 static void target_complete_failure_work(struct work_struct *work)
 670 {
 671         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
 672
 673         transport_generic_request_failure(cmd);
 674 }
 675
 676 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
 677 {
 678         struct se_device *dev = cmd->se_dev;
 679         int success = scsi_status == GOOD;
 680         unsigned long flags;
 681
 682         cmd->scsi_status = scsi_status;
 683
 684
 685         spin_lock_irqsave(&cmd->t_state_lock, flags);
 686         cmd->transport_state &= ~CMD_T_BUSY;
 687
 688         if (dev && dev->transport->transport_complete) {
 689                 if (dev->transport->transport_complete(cmd,
 690                                 cmd->t_data_sg) != 0) {
 691                         cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
 692                         success = 1;
 693                 }
 694         }
 695
 696         /*
 697          * See if we are waiting to complete for an exception condition.
 698          */
 699         if (cmd->transport_state & CMD_T_REQUEST_STOP) {
 700                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 701                 complete(&cmd->task_stop_comp);
 702                 return;
 703         }
 704
 705         if (!success)
 706                 cmd->transport_state |= CMD_T_FAILED;
 707
 708         /*
 709          * Check for case where an explict ABORT_TASK has been received
 710          * and transport_wait_for_tasks() will be waiting for completion..
 711          */
 712         if (cmd->transport_state & CMD_T_ABORTED &&
 713             cmd->transport_state & CMD_T_STOP) {
 714                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 715                 complete(&cmd->t_transport_stop_comp);
 716                 return;
 717         } else if (cmd->transport_state & CMD_T_FAILED) {
 718                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 719                 INIT_WORK(&cmd->work, target_complete_failure_work);
 720         } else {
 721                 INIT_WORK(&cmd->work, target_complete_ok_work);
 722         }
 723
 724         cmd->t_state = TRANSPORT_COMPLETE;
 725         cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
 726         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 727
 728         queue_work(target_completion_wq, &cmd->work);
 729 }
 730 EXPORT_SYMBOL(target_complete_cmd);
 731
 732 static void target_add_to_state_list(struct se_cmd *cmd)
 733 {
 734         struct se_device *dev = cmd->se_dev;
 735         unsigned long flags;
 736
 737         spin_lock_irqsave(&dev->execute_task_lock, flags);
 738         if (!cmd->state_active) {
 739                 list_add_tail(&cmd->state_list, &dev->state_list);
 740                 cmd->state_active = true;
 741         }
 742         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 743 }
 744
 745 static void __target_add_to_execute_list(struct se_cmd *cmd)
 746 {
 747         struct se_device *dev = cmd->se_dev;
 748         bool head_of_queue = false;
 749
 750         if (!list_empty(&cmd->execute_list))
 751                 return;
 752
 753         if (dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED &&
 754             cmd->sam_task_attr == MSG_HEAD_TAG)
 755                 head_of_queue = true;
 756
 757         if (head_of_queue)
 758                 list_add(&cmd->execute_list, &dev->execute_list);
 759         else
 760                 list_add_tail(&cmd->execute_list, &dev->execute_list);
 761
 762         atomic_inc(&dev->execute_tasks);
 763
 764         if (cmd->state_active)
 765                 return;
 766
 767         if (head_of_queue)
 768                 list_add(&cmd->state_list, &dev->state_list);
 769         else
 770                 list_add_tail(&cmd->state_list, &dev->state_list);
 771
 772         cmd->state_active = true;
 773 }
 774
 775 static void target_add_to_execute_list(struct se_cmd *cmd)
 776 {
 777         unsigned long flags;
 778         struct se_device *dev = cmd->se_dev;
 779
 780         spin_lock_irqsave(&dev->execute_task_lock, flags);
 781         __target_add_to_execute_list(cmd);
 782         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 783 }
 784
 785 void __target_remove_from_execute_list(struct se_cmd *cmd)
 786 {
 787         list_del_init(&cmd->execute_list);
 788         atomic_dec(&cmd->se_dev->execute_tasks);
 789 }
 790
 791 static void target_remove_from_execute_list(struct se_cmd *cmd)
 792 {
 793         struct se_device *dev = cmd->se_dev;
 794         unsigned long flags;
 795
 796         if (WARN_ON(list_empty(&cmd->execute_list)))
 797                 return;
 798
 799         spin_lock_irqsave(&dev->execute_task_lock, flags);
 800         __target_remove_from_execute_list(cmd);
 801         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 802 }
 803
 804 /*
 805  * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
 806  */
 807
 808 static void target_qf_do_work(struct work_struct *work)
 809 {
 810         struct se_device *dev = container_of(work, struct se_device,
 811                                         qf_work_queue);
 812         LIST_HEAD(qf_cmd_list);
 813         struct se_cmd *cmd, *cmd_tmp;
 814
 815         spin_lock_irq(&dev->qf_cmd_lock);
 816         list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
 817         spin_unlock_irq(&dev->qf_cmd_lock);
 818
 819         list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
 820                 list_del(&cmd->se_qf_node);
 821                 atomic_dec(&dev->dev_qf_count);
 822                 smp_mb__after_atomic_dec();
 823
 824                 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
 825                         " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
 826                         (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
 827                         (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
 828                         : "UNKNOWN");
 829
 830                 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
 831         }
 832 }
 833
 834 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
 835 {
 836         switch (cmd->data_direction) {
 837         case DMA_NONE:
 838                 return "NONE";
 839         case DMA_FROM_DEVICE:
 840                 return "READ";
 841         case DMA_TO_DEVICE:
 842                 return "WRITE";
 843         case DMA_BIDIRECTIONAL:
 844                 return "BIDI";
 845         default:
 846                 break;
 847         }
 848
 849         return "UNKNOWN";
 850 }
 851
 852 void transport_dump_dev_state(
 853         struct se_device *dev,
 854         char *b,
 855         int *bl)
 856 {
 857         *bl += sprintf(b + *bl, "Status: ");
 858         switch (dev->dev_status) {
 859         case TRANSPORT_DEVICE_ACTIVATED:
 860                 *bl += sprintf(b + *bl, "ACTIVATED");
 861                 break;
 862         case TRANSPORT_DEVICE_DEACTIVATED:
 863                 *bl += sprintf(b + *bl, "DEACTIVATED");
 864                 break;
 865         case TRANSPORT_DEVICE_SHUTDOWN:
 866                 *bl += sprintf(b + *bl, "SHUTDOWN");
 867                 break;
 868         case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
 869         case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
 870                 *bl += sprintf(b + *bl, "OFFLINE");
 871                 break;
 872         default:
 873                 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
 874                 break;
 875         }
 876
 877         *bl += sprintf(b + *bl, "  Execute/Max Queue Depth: %d/%d",
 878                 atomic_read(&dev->execute_tasks), dev->queue_depth);
 879         *bl += sprintf(b + *bl, "  SectorSize: %u  HwMaxSectors: %u\n",
 880                 dev->se_sub_dev->se_dev_attrib.block_size,
 881                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
 882         *bl += sprintf(b + *bl, "        ");
 883 }
 884
 885 void transport_dump_vpd_proto_id(
 886         struct t10_vpd *vpd,
 887         unsigned char *p_buf,
 888         int p_buf_len)
 889 {
 890         unsigned char buf[VPD_TMP_BUF_SIZE];
 891         int len;
 892
 893         memset(buf, 0, VPD_TMP_BUF_SIZE);
 894         len = sprintf(buf, "T10 VPD Protocol Identifier: ");
 895
 896         switch (vpd->protocol_identifier) {
 897         case 0x00:
 898                 sprintf(buf+len, "Fibre Channel\n");
 899                 break;
 900         case 0x10:
 901                 sprintf(buf+len, "Parallel SCSI\n");
 902                 break;
 903         case 0x20:
 904                 sprintf(buf+len, "SSA\n");
 905                 break;
 906         case 0x30:
 907                 sprintf(buf+len, "IEEE 1394\n");
 908                 break;
 909         case 0x40:
 910                 sprintf(buf+len, "SCSI Remote Direct Memory Access"
 911                                 " Protocol\n");
 912                 break;
 913         case 0x50:
 914                 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
 915                 break;
 916         case 0x60:
 917                 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
 918                 break;
 919         case 0x70:
 920                 sprintf(buf+len, "Automation/Drive Interface Transport"
 921                                 " Protocol\n");
 922                 break;
 923         case 0x80:
 924                 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
 925                 break;
 926         default:
 927                 sprintf(buf+len, "Unknown 0x%02x\n",
 928                                 vpd->protocol_identifier);
 929                 break;
 930         }
 931
 932         if (p_buf)
 933                 strncpy(p_buf, buf, p_buf_len);
 934         else
 935                 pr_debug("%s", buf);
 936 }
 937
 938 void
 939 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
 940 {
 941         /*
 942          * Check if the Protocol Identifier Valid (PIV) bit is set..
 943          *
 944          * from spc3r23.pdf section 7.5.1
 945          */
 946          if (page_83[1] & 0x80) {
 947                 vpd->protocol_identifier = (page_83[0] & 0xf0);
 948                 vpd->protocol_identifier_set = 1;
 949                 transport_dump_vpd_proto_id(vpd, NULL, 0);
 950         }
 951 }
 952 EXPORT_SYMBOL(transport_set_vpd_proto_id);
 953
 954 int transport_dump_vpd_assoc(
 955         struct t10_vpd *vpd,
 956         unsigned char *p_buf,
 957         int p_buf_len)
 958 {
 959         unsigned char buf[VPD_TMP_BUF_SIZE];
 960         int ret = 0;
 961         int len;
 962
 963         memset(buf, 0, VPD_TMP_BUF_SIZE);
 964         len = sprintf(buf, "T10 VPD Identifier Association: ");
 965
 966         switch (vpd->association) {
 967         case 0x00:
 968                 sprintf(buf+len, "addressed logical unit\n");
 969                 break;
 970         case 0x10:
 971                 sprintf(buf+len, "target port\n");
 972                 break;
 973         case 0x20:
 974                 sprintf(buf+len, "SCSI target device\n");
 975                 break;
 976         default:
 977                 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
 978                 ret = -EINVAL;
 979                 break;
 980         }
 981
 982         if (p_buf)
 983                 strncpy(p_buf, buf, p_buf_len);
 984         else
 985                 pr_debug("%s", buf);
 986
 987         return ret;
 988 }
 989
 990 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
 991 {
 992         /*
 993          * The VPD identification association..
 994          *
 995          * from spc3r23.pdf Section 7.6.3.1 Table 297
 996          */
 997         vpd->association = (page_83[1] & 0x30);
 998         return transport_dump_vpd_assoc(vpd, NULL, 0);
 999 }
1000 EXPORT_SYMBOL(transport_set_vpd_assoc);
1001
1002 int transport_dump_vpd_ident_type(
1003         struct t10_vpd *vpd,
1004         unsigned char *p_buf,
1005         int p_buf_len)
1006 {
1007         unsigned char buf[VPD_TMP_BUF_SIZE];
1008         int ret = 0;
1009         int len;
1010
1011         memset(buf, 0, VPD_TMP_BUF_SIZE);
1012         len = sprintf(buf, "T10 VPD Identifier Type: ");
1013
1014         switch (vpd->device_identifier_type) {
1015         case 0x00:
1016                 sprintf(buf+len, "Vendor specific\n");
1017                 break;
1018         case 0x01:
1019                 sprintf(buf+len, "T10 Vendor ID based\n");
1020                 break;
1021         case 0x02:
1022                 sprintf(buf+len, "EUI-64 based\n");
1023                 break;
1024         case 0x03:
1025                 sprintf(buf+len, "NAA\n");
1026                 break;
1027         case 0x04:
1028                 sprintf(buf+len, "Relative target port identifier\n");
1029                 break;
1030         case 0x08:
1031                 sprintf(buf+len, "SCSI name string\n");
1032                 break;
1033         default:
1034                 sprintf(buf+len, "Unsupported: 0x%02x\n",
1035                                 vpd->device_identifier_type);
1036                 ret = -EINVAL;
1037                 break;
1038         }
1039
1040         if (p_buf) {
1041                 if (p_buf_len < strlen(buf)+1)
1042                         return -EINVAL;
1043                 strncpy(p_buf, buf, p_buf_len);
1044         } else {
1045                 pr_debug("%s", buf);
1046         }
1047
1048         return ret;
1049 }
1050
1051 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1052 {
1053         /*
1054          * The VPD identifier type..
1055          *
1056          * from spc3r23.pdf Section 7.6.3.1 Table 298
1057          */
1058         vpd->device_identifier_type = (page_83[1] & 0x0f);
1059         return transport_dump_vpd_ident_type(vpd, NULL, 0);
1060 }
1061 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1062
1063 int transport_dump_vpd_ident(
1064         struct t10_vpd *vpd,
1065         unsigned char *p_buf,
1066         int p_buf_len)
1067 {
1068         unsigned char buf[VPD_TMP_BUF_SIZE];
1069         int ret = 0;
1070
1071         memset(buf, 0, VPD_TMP_BUF_SIZE);
1072
1073         switch (vpd->device_identifier_code_set) {
1074         case 0x01: /* Binary */
1075                 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1076                         &vpd->device_identifier[0]);
1077                 break;
1078         case 0x02: /* ASCII */
1079                 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1080                         &vpd->device_identifier[0]);
1081                 break;
1082         case 0x03: /* UTF-8 */
1083                 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1084                         &vpd->device_identifier[0]);
1085                 break;
1086         default:
1087                 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1088                         " 0x%02x", vpd->device_identifier_code_set);
1089                 ret = -EINVAL;
1090                 break;
1091         }
1092
1093         if (p_buf)
1094                 strncpy(p_buf, buf, p_buf_len);
1095         else
1096                 pr_debug("%s", buf);
1097
1098         return ret;
1099 }
1100
1101 int
1102 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1103 {
1104         static const char hex_str[] = "0123456789abcdef";
1105         int j = 0, i = 4; /* offset to start of the identifer */
1106
1107         /*
1108          * The VPD Code Set (encoding)
1109          *
1110          * from spc3r23.pdf Section 7.6.3.1 Table 296
1111          */
1112         vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1113         switch (vpd->device_identifier_code_set) {
1114         case 0x01: /* Binary */
1115                 vpd->device_identifier[j++] =
1116                                 hex_str[vpd->device_identifier_type];
1117                 while (i < (4 + page_83[3])) {
1118                         vpd->device_identifier[j++] =
1119                                 hex_str[(page_83[i] & 0xf0) >> 4];
1120                         vpd->device_identifier[j++] =
1121                                 hex_str[page_83[i] & 0x0f];
1122                         i++;
1123                 }
1124                 break;
1125         case 0x02: /* ASCII */
1126         case 0x03: /* UTF-8 */
1127                 while (i < (4 + page_83[3]))
1128                         vpd->device_identifier[j++] = page_83[i++];
1129                 break;
1130         default:
1131                 break;
1132         }
1133
1134         return transport_dump_vpd_ident(vpd, NULL, 0);
1135 }
1136 EXPORT_SYMBOL(transport_set_vpd_ident);
1137
1138 static void core_setup_task_attr_emulation(struct se_device *dev)
1139 {
1140         /*
1141          * If this device is from Target_Core_Mod/pSCSI, disable the
1142          * SAM Task Attribute emulation.
1143          *
1144          * This is currently not available in upsream Linux/SCSI Target
1145          * mode code, and is assumed to be disabled while using TCM/pSCSI.
1146          */
1147         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1148                 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1149                 return;
1150         }
1151
1152         dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1153         pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1154                 " device\n", dev->transport->name,
1155                 dev->transport->get_device_rev(dev));
1156 }
1157
1158 static void scsi_dump_inquiry(struct se_device *dev)
1159 {
1160         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1161         char buf[17];
1162         int i, device_type;
1163         /*
1164          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1165          */
1166         for (i = 0; i < 8; i++)
1167                 if (wwn->vendor[i] >= 0x20)
1168                         buf[i] = wwn->vendor[i];
1169                 else
1170                         buf[i] = ' ';
1171         buf[i] = '\0';
1172         pr_debug("  Vendor: %s\n", buf);
1173
1174         for (i = 0; i < 16; i++)
1175                 if (wwn->model[i] >= 0x20)
1176                         buf[i] = wwn->model[i];
1177                 else
1178                         buf[i] = ' ';
1179         buf[i] = '\0';
1180         pr_debug("  Model: %s\n", buf);
1181
1182         for (i = 0; i < 4; i++)
1183                 if (wwn->revision[i] >= 0x20)
1184                         buf[i] = wwn->revision[i];
1185                 else
1186                         buf[i] = ' ';
1187         buf[i] = '\0';
1188         pr_debug("  Revision: %s\n", buf);
1189
1190         device_type = dev->transport->get_device_type(dev);
1191         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1192         pr_debug("                 ANSI SCSI revision: %02x\n",
1193                                 dev->transport->get_device_rev(dev));
1194 }
1195
1196 struct se_device *transport_add_device_to_core_hba(
1197         struct se_hba *hba,
1198         struct se_subsystem_api *transport,
1199         struct se_subsystem_dev *se_dev,
1200         u32 device_flags,
1201         void *transport_dev,
1202         struct se_dev_limits *dev_limits,
1203         const char *inquiry_prod,
1204         const char *inquiry_rev)
1205 {
1206         int force_pt;
1207         struct se_device  *dev;
1208
1209         dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1210         if (!dev) {
1211                 pr_err("Unable to allocate memory for se_dev_t\n");
1212                 return NULL;
1213         }
1214
1215         transport_init_queue_obj(&dev->dev_queue_obj);
1216         dev->dev_flags          = device_flags;
1217         dev->dev_status         |= TRANSPORT_DEVICE_DEACTIVATED;
1218         dev->dev_ptr            = transport_dev;
1219         dev->se_hba             = hba;
1220         dev->se_sub_dev         = se_dev;
1221         dev->transport          = transport;
1222         INIT_LIST_HEAD(&dev->dev_list);
1223         INIT_LIST_HEAD(&dev->dev_sep_list);
1224         INIT_LIST_HEAD(&dev->dev_tmr_list);
1225         INIT_LIST_HEAD(&dev->execute_list);
1226         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1227         INIT_LIST_HEAD(&dev->state_list);
1228         INIT_LIST_HEAD(&dev->qf_cmd_list);
1229         spin_lock_init(&dev->execute_task_lock);
1230         spin_lock_init(&dev->delayed_cmd_lock);
1231         spin_lock_init(&dev->dev_reservation_lock);
1232         spin_lock_init(&dev->dev_status_lock);
1233         spin_lock_init(&dev->se_port_lock);
1234         spin_lock_init(&dev->se_tmr_lock);
1235         spin_lock_init(&dev->qf_cmd_lock);
1236         atomic_set(&dev->dev_ordered_id, 0);
1237
1238         se_dev_set_default_attribs(dev, dev_limits);
1239
1240         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1241         dev->creation_time = get_jiffies_64();
1242         spin_lock_init(&dev->stats_lock);
1243
1244         spin_lock(&hba->device_lock);
1245         list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1246         hba->dev_count++;
1247         spin_unlock(&hba->device_lock);
1248         /*
1249          * Setup the SAM Task Attribute emulation for struct se_device
1250          */
1251         core_setup_task_attr_emulation(dev);
1252         /*
1253          * Force PR and ALUA passthrough emulation with internal object use.
1254          */
1255         force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1256         /*
1257          * Setup the Reservations infrastructure for struct se_device
1258          */
1259         core_setup_reservations(dev, force_pt);
1260         /*
1261          * Setup the Asymmetric Logical Unit Assignment for struct se_device
1262          */
1263         if (core_setup_alua(dev, force_pt) < 0)
1264                 goto out;
1265
1266         /*
1267          * Startup the struct se_device processing thread
1268          */
1269         dev->process_thread = kthread_run(transport_processing_thread, dev,
1270                                           "LIO_%s", dev->transport->name);
1271         if (IS_ERR(dev->process_thread)) {
1272                 pr_err("Unable to create kthread: LIO_%s\n",
1273                         dev->transport->name);
1274                 goto out;
1275         }
1276         /*
1277          * Setup work_queue for QUEUE_FULL
1278          */
1279         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1280         /*
1281          * Preload the initial INQUIRY const values if we are doing
1282          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1283          * passthrough because this is being provided by the backend LLD.
1284          * This is required so that transport_get_inquiry() copies these
1285          * originals once back into DEV_T10_WWN(dev) for the virtual device
1286          * setup.
1287          */
1288         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1289                 if (!inquiry_prod || !inquiry_rev) {
1290                         pr_err("All non TCM/pSCSI plugins require"
1291                                 " INQUIRY consts\n");
1292                         goto out;
1293                 }
1294
1295                 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1296                 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1297                 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1298         }
1299         scsi_dump_inquiry(dev);
1300
1301         return dev;
1302 out:
1303         kthread_stop(dev->process_thread);
1304
1305         spin_lock(&hba->device_lock);
1306         list_del(&dev->dev_list);
1307         hba->dev_count--;
1308         spin_unlock(&hba->device_lock);
1309
1310         se_release_vpd_for_dev(dev);
1311
1312         kfree(dev);
1313
1314         return NULL;
1315 }
1316 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1317
1318 /*      transport_generic_prepare_cdb():
1319  *
1320  *      Since the Initiator sees iSCSI devices as LUNs,  the SCSI CDB will
1321  *      contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1322  *      The point of this is since we are mapping iSCSI LUNs to
1323  *      SCSI Target IDs having a non-zero LUN in the CDB will throw the
1324  *      devices and HBAs for a loop.
1325  */
1326 static inline void transport_generic_prepare_cdb(
1327         unsigned char *cdb)
1328 {
1329         switch (cdb[0]) {
1330         case READ_10: /* SBC - RDProtect */
1331         case READ_12: /* SBC - RDProtect */
1332         case READ_16: /* SBC - RDProtect */
1333         case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1334         case VERIFY: /* SBC - VRProtect */
1335         case VERIFY_16: /* SBC - VRProtect */
1336         case WRITE_VERIFY: /* SBC - VRProtect */
1337         case WRITE_VERIFY_12: /* SBC - VRProtect */
1338         case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1339                 break;
1340         default:
1341                 cdb[1] &= 0x1f; /* clear logical unit number */
1342                 break;
1343         }
1344 }
1345
1346 static int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1347 {
1348         struct se_device *dev = cmd->se_dev;
1349
1350         if (cmd->unknown_data_length) {
1351                 cmd->data_length = size;
1352         } else if (size != cmd->data_length) {
1353                 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1354                         " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1355                         " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1356                                 cmd->data_length, size, cmd->t_task_cdb[0]);
1357
1358                 cmd->cmd_spdtl = size;
1359
1360                 if (cmd->data_direction == DMA_TO_DEVICE) {
1361                         pr_err("Rejecting underflow/overflow"
1362                                         " WRITE data\n");
1363                         goto out_invalid_cdb_field;
1364                 }
1365                 /*
1366                  * Reject READ_* or WRITE_* with overflow/underflow for
1367                  * type SCF_SCSI_DATA_CDB.
1368                  */
1369                 if (dev->se_sub_dev->se_dev_attrib.block_size != 512)  {
1370                         pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1371                                 " CDB on non 512-byte sector setup subsystem"
1372                                 " plugin: %s\n", dev->transport->name);
1373                         /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1374                         goto out_invalid_cdb_field;
1375                 }
1376
1377                 if (size > cmd->data_length) {
1378                         cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1379                         cmd->residual_count = (size - cmd->data_length);
1380                 } else {
1381                         cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1382                         cmd->residual_count = (cmd->data_length - size);
1383                 }
1384                 cmd->data_length = size;
1385         }
1386
1387         return 0;
1388
1389 out_invalid_cdb_field:
1390         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1391         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1392         return -EINVAL;
1393 }
1394
1395 /*
1396  * Used by fabric modules containing a local struct se_cmd within their
1397  * fabric dependent per I/O descriptor.
1398  */
1399 void transport_init_se_cmd(
1400         struct se_cmd *cmd,
1401         struct target_core_fabric_ops *tfo,
1402         struct se_session *se_sess,
1403         u32 data_length,
1404         int data_direction,
1405         int task_attr,
1406         unsigned char *sense_buffer)
1407 {
1408         INIT_LIST_HEAD(&cmd->se_lun_node);
1409         INIT_LIST_HEAD(&cmd->se_delayed_node);
1410         INIT_LIST_HEAD(&cmd->se_qf_node);
1411         INIT_LIST_HEAD(&cmd->se_queue_node);
1412         INIT_LIST_HEAD(&cmd->se_cmd_list);
1413         INIT_LIST_HEAD(&cmd->execute_list);
1414         INIT_LIST_HEAD(&cmd->state_list);
1415         init_completion(&cmd->transport_lun_fe_stop_comp);
1416         init_completion(&cmd->transport_lun_stop_comp);
1417         init_completion(&cmd->t_transport_stop_comp);
1418         init_completion(&cmd->cmd_wait_comp);
1419         init_completion(&cmd->task_stop_comp);
1420         spin_lock_init(&cmd->t_state_lock);
1421         cmd->transport_state = CMD_T_DEV_ACTIVE;
1422
1423         cmd->se_tfo = tfo;
1424         cmd->se_sess = se_sess;
1425         cmd->data_length = data_length;
1426         cmd->data_direction = data_direction;
1427         cmd->sam_task_attr = task_attr;
1428         cmd->sense_buffer = sense_buffer;
1429
1430         cmd->state_active = false;
1431 }
1432 EXPORT_SYMBOL(transport_init_se_cmd);
1433
1434 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1435 {
1436         /*
1437          * Check if SAM Task Attribute emulation is enabled for this
1438          * struct se_device storage object
1439          */
1440         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1441                 return 0;
1442
1443         if (cmd->sam_task_attr == MSG_ACA_TAG) {
1444                 pr_debug("SAM Task Attribute ACA"
1445                         " emulation is not supported\n");
1446                 return -EINVAL;
1447         }
1448         /*
1449          * Used to determine when ORDERED commands should go from
1450          * Dormant to Active status.
1451          */
1452         cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1453         smp_mb__after_atomic_inc();
1454         pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1455                         cmd->se_ordered_id, cmd->sam_task_attr,
1456                         cmd->se_dev->transport->name);
1457         return 0;
1458 }
1459
1460 /*      target_setup_cmd_from_cdb():
1461  *
1462  *      Called from fabric RX Thread.
1463  */
1464 int target_setup_cmd_from_cdb(
1465         struct se_cmd *cmd,
1466         unsigned char *cdb)
1467 {
1468         struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
1469         u32 pr_reg_type = 0;
1470         u8 alua_ascq = 0;
1471         unsigned long flags;
1472         unsigned int size;
1473         int ret;
1474
1475         transport_generic_prepare_cdb(cdb);
1476         /*
1477          * Ensure that the received CDB is less than the max (252 + 8) bytes
1478          * for VARIABLE_LENGTH_CMD
1479          */
1480         if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1481                 pr_err("Received SCSI CDB with command_size: %d that"
1482                         " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1483                         scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1484                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1485                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1486                 return -EINVAL;
1487         }
1488         /*
1489          * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1490          * allocate the additional extended CDB buffer now..  Otherwise
1491          * setup the pointer from __t_task_cdb to t_task_cdb.
1492          */
1493         if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1494                 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1495                                                 GFP_KERNEL);
1496                 if (!cmd->t_task_cdb) {
1497                         pr_err("Unable to allocate cmd->t_task_cdb"
1498                                 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1499                                 scsi_command_size(cdb),
1500                                 (unsigned long)sizeof(cmd->__t_task_cdb));
1501                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1502                         cmd->scsi_sense_reason =
1503                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1504                         return -ENOMEM;
1505                 }
1506         } else
1507                 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1508         /*
1509          * Copy the original CDB into cmd->
1510          */
1511         memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1512
1513         /*
1514          * Check for an existing UNIT ATTENTION condition
1515          */
1516         if (core_scsi3_ua_check(cmd, cdb) < 0) {
1517                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1518                 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
1519                 return -EINVAL;
1520         }
1521
1522         ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
1523         if (ret != 0) {
1524                 /*
1525                  * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
1526                  * The ALUA additional sense code qualifier (ASCQ) is determined
1527                  * by the ALUA primary or secondary access state..
1528                  */
1529                 if (ret > 0) {
1530                         pr_debug("[%s]: ALUA TG Port not available, "
1531                                 "SenseKey: NOT_READY, ASC/ASCQ: "
1532                                 "0x04/0x%02x\n",
1533                                 cmd->se_tfo->get_fabric_name(), alua_ascq);
1534
1535                         transport_set_sense_codes(cmd, 0x04, alua_ascq);
1536                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1537                         cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
1538                         return -EINVAL;
1539                 }
1540                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1541                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1542                 return -EINVAL;
1543         }
1544
1545         /*
1546          * Check status for SPC-3 Persistent Reservations
1547          */
1548         if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) {
1549                 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
1550                                         cmd, cdb, pr_reg_type) != 0) {
1551                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1552                         cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
1553                         cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1554                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
1555                         return -EBUSY;
1556                 }
1557                 /*
1558                  * This means the CDB is allowed for the SCSI Initiator port
1559                  * when said port is *NOT* holding the legacy SPC-2 or
1560                  * SPC-3 Persistent Reservation.
1561                  */
1562         }
1563
1564         ret = cmd->se_dev->transport->parse_cdb(cmd, &size);
1565         if (ret < 0)
1566                 return ret;
1567
1568         ret = target_cmd_size_check(cmd, size);
1569         if (ret < 0)
1570                 return ret;
1571
1572         spin_lock_irqsave(&cmd->t_state_lock, flags);
1573         cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1574         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1575
1576         /*
1577          * Check for SAM Task Attribute Emulation
1578          */
1579         if (transport_check_alloc_task_attr(cmd) < 0) {
1580                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1581                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1582                 return -EINVAL;
1583         }
1584         spin_lock(&cmd->se_lun->lun_sep_lock);
1585         if (cmd->se_lun->lun_sep)
1586                 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1587         spin_unlock(&cmd->se_lun->lun_sep_lock);
1588         return 0;
1589 }
1590 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1591
1592 /*
1593  * Used by fabric module frontends to queue tasks directly.
1594  * Many only be used from process context only
1595  */
1596 int transport_handle_cdb_direct(
1597         struct se_cmd *cmd)
1598 {
1599         int ret;
1600
1601         if (!cmd->se_lun) {
1602                 dump_stack();
1603                 pr_err("cmd->se_lun is NULL\n");
1604                 return -EINVAL;
1605         }
1606         if (in_interrupt()) {
1607                 dump_stack();
1608                 pr_err("transport_generic_handle_cdb cannot be called"
1609                                 " from interrupt context\n");
1610                 return -EINVAL;
1611         }
1612         /*
1613          * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following
1614          * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1615          * in existing usage to ensure that outstanding descriptors are handled
1616          * correctly during shutdown via transport_wait_for_tasks()
1617          *
1618          * Also, we don't take cmd->t_state_lock here as we only expect
1619          * this to be called for initial descriptor submission.
1620          */
1621         cmd->t_state = TRANSPORT_NEW_CMD;
1622         cmd->transport_state |= CMD_T_ACTIVE;
1623
1624         /*
1625          * transport_generic_new_cmd() is already handling QUEUE_FULL,
1626          * so follow TRANSPORT_NEW_CMD processing thread context usage
1627          * and call transport_generic_request_failure() if necessary..
1628          */
1629         ret = transport_generic_new_cmd(cmd);
1630         if (ret < 0)
1631                 transport_generic_request_failure(cmd);
1632
1633         return 0;
1634 }
1635 EXPORT_SYMBOL(transport_handle_cdb_direct);
1636
1637 /**
1638  * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1639  *
1640  * @se_cmd: command descriptor to submit
1641  * @se_sess: associated se_sess for endpoint
1642  * @cdb: pointer to SCSI CDB
1643  * @sense: pointer to SCSI sense buffer
1644  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1645  * @data_length: fabric expected data transfer length
1646  * @task_addr: SAM task attribute
1647  * @data_dir: DMA data direction
1648  * @flags: flags for command submission from target_sc_flags_tables
1649  *
1650  * This may only be called from process context, and also currently
1651  * assumes internal allocation of fabric payload buffer by target-core.
1652  **/
1653 void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1654                 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1655                 u32 data_length, int task_attr, int data_dir, int flags)
1656 {
1657         struct se_portal_group *se_tpg;
1658         int rc;
1659
1660         se_tpg = se_sess->se_tpg;
1661         BUG_ON(!se_tpg);
1662         BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1663         BUG_ON(in_interrupt());
1664         /*
1665          * Initialize se_cmd for target operation.  From this point
1666          * exceptions are handled by sending exception status via
1667          * target_core_fabric_ops->queue_status() callback
1668          */
1669         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1670                                 data_length, data_dir, task_attr, sense);
1671         if (flags & TARGET_SCF_UNKNOWN_SIZE)
1672                 se_cmd->unknown_data_length = 1;
1673         /*
1674          * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1675          * se_sess->sess_cmd_list.  A second kref_get here is necessary
1676          * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1677          * kref_put() to happen during fabric packet acknowledgement.
1678          */
1679         target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1680         /*
1681          * Signal bidirectional data payloads to target-core
1682          */
1683         if (flags & TARGET_SCF_BIDI_OP)
1684                 se_cmd->se_cmd_flags |= SCF_BIDI;
1685         /*
1686          * Locate se_lun pointer and attach it to struct se_cmd
1687          */
1688         if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1689                 transport_send_check_condition_and_sense(se_cmd,
1690                                 se_cmd->scsi_sense_reason, 0);
1691                 target_put_sess_cmd(se_sess, se_cmd);
1692                 return;
1693         }
1694
1695         rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1696         if (rc != 0) {
1697                 transport_generic_request_failure(se_cmd);
1698                 return;
1699         }
1700
1701         /*
1702          * Check if we need to delay processing because of ALUA
1703          * Active/NonOptimized primary access state..
1704          */
1705         core_alua_check_nonop_delay(se_cmd);
1706
1707         /*
1708          * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1709          * for immediate execution of READs, otherwise wait for
1710          * transport_generic_handle_data() to be called for WRITEs
1711          * when fabric has filled the incoming buffer.
1712          */
1713         transport_handle_cdb_direct(se_cmd);
1714         return;
1715 }
1716 EXPORT_SYMBOL(target_submit_cmd);
1717
1718 static void target_complete_tmr_failure(struct work_struct *work)
1719 {
1720         struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1721
1722         se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1723         se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1724         transport_generic_free_cmd(se_cmd, 0);
1725 }
1726
1727 /**
1728  * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1729  *                     for TMR CDBs
1730  *
1731  * @se_cmd: command descriptor to submit
1732  * @se_sess: associated se_sess for endpoint
1733  * @sense: pointer to SCSI sense buffer
1734  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1735  * @fabric_context: fabric context for TMR req
1736  * @tm_type: Type of TM request
1737  * @gfp: gfp type for caller
1738  * @tag: referenced task tag for TMR_ABORT_TASK
1739  * @flags: submit cmd flags
1740  *
1741  * Callable from all contexts.
1742  **/
1743
1744 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1745                 unsigned char *sense, u32 unpacked_lun,
1746                 void *fabric_tmr_ptr, unsigned char tm_type,
1747                 gfp_t gfp, unsigned int tag, int flags)
1748 {
1749         struct se_portal_group *se_tpg;
1750         int ret;
1751
1752         se_tpg = se_sess->se_tpg;
1753         BUG_ON(!se_tpg);
1754
1755         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1756                               0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1757         /*
1758          * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1759          * allocation failure.
1760          */
1761         ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1762         if (ret < 0)
1763                 return -ENOMEM;
1764
1765         if (tm_type == TMR_ABORT_TASK)
1766                 se_cmd->se_tmr_req->ref_task_tag = tag;
1767
1768         /* See target_submit_cmd for commentary */
1769         target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1770
1771         ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1772         if (ret) {
1773                 /*
1774                  * For callback during failure handling, push this work off
1775                  * to process context with TMR_LUN_DOES_NOT_EXIST status.
1776                  */
1777                 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1778                 schedule_work(&se_cmd->work);
1779                 return 0;
1780         }
1781         transport_generic_handle_tmr(se_cmd);
1782         return 0;
1783 }
1784 EXPORT_SYMBOL(target_submit_tmr);
1785
1786 /*
1787  * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1788  * to  queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1789  * complete setup in TCM process context w/ TFO->new_cmd_map().
1790  */
1791 int transport_generic_handle_cdb_map(
1792         struct se_cmd *cmd)
1793 {
1794         if (!cmd->se_lun) {
1795                 dump_stack();
1796                 pr_err("cmd->se_lun is NULL\n");
1797                 return -EINVAL;
1798         }
1799
1800         transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
1801         return 0;
1802 }
1803 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1804
1805 /*      transport_generic_handle_data():
1806  *
1807  *
1808  */
1809 int transport_generic_handle_data(
1810         struct se_cmd *cmd)
1811 {
1812         /*
1813          * For the software fabric case, then we assume the nexus is being
1814          * failed/shutdown when signals are pending from the kthread context
1815          * caller, so we return a failure.  For the HW target mode case running
1816          * in interrupt code, the signal_pending() check is skipped.
1817          */
1818         if (!in_interrupt() && signal_pending(current))
1819                 return -EPERM;
1820         /*
1821          * If the received CDB has aleady been ABORTED by the generic
1822          * target engine, we now call transport_check_aborted_status()
1823          * to queue any delated TASK_ABORTED status for the received CDB to the
1824          * fabric module as we are expecting no further incoming DATA OUT
1825          * sequences at this point.
1826          */
1827         if (transport_check_aborted_status(cmd, 1) != 0)
1828                 return 0;
1829
1830         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
1831         return 0;
1832 }
1833 EXPORT_SYMBOL(transport_generic_handle_data);
1834
1835 /*      transport_generic_handle_tmr():
1836  *
1837  *
1838  */
1839 int transport_generic_handle_tmr(
1840         struct se_cmd *cmd)
1841 {
1842         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
1843         return 0;
1844 }
1845 EXPORT_SYMBOL(transport_generic_handle_tmr);
1846
1847 /*
1848  * If the cmd is active, request it to be stopped and sleep until it
1849  * has completed.
1850  */
1851 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1852 {
1853         bool was_active = false;
1854
1855         if (cmd->transport_state & CMD_T_BUSY) {
1856                 cmd->transport_state |= CMD_T_REQUEST_STOP;
1857                 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1858
1859                 pr_debug("cmd %p waiting to complete\n", cmd);
1860                 wait_for_completion(&cmd->task_stop_comp);
1861                 pr_debug("cmd %p stopped successfully\n", cmd);
1862
1863                 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1864                 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1865                 cmd->transport_state &= ~CMD_T_BUSY;
1866                 was_active = true;
1867         }
1868
1869         return was_active;
1870 }
1871
1872 /*
1873  * Handle SAM-esque emulation for generic transport request failures.
1874  */
1875 void transport_generic_request_failure(struct se_cmd *cmd)
1876 {
1877         int ret = 0;
1878
1879         pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1880                 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1881                 cmd->t_task_cdb[0]);
1882         pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1883                 cmd->se_tfo->get_cmd_state(cmd),
1884                 cmd->t_state, cmd->scsi_sense_reason);
1885         pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1886                 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1887                 (cmd->transport_state & CMD_T_STOP) != 0,
1888                 (cmd->transport_state & CMD_T_SENT) != 0);
1889
1890         /*
1891          * For SAM Task Attribute emulation for failed struct se_cmd
1892          */
1893         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1894                 transport_complete_task_attr(cmd);
1895
1896         switch (cmd->scsi_sense_reason) {
1897         case TCM_NON_EXISTENT_LUN:
1898         case TCM_UNSUPPORTED_SCSI_OPCODE:
1899         case TCM_INVALID_CDB_FIELD:
1900         case TCM_INVALID_PARAMETER_LIST:
1901         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1902         case TCM_UNKNOWN_MODE_PAGE:
1903         case TCM_WRITE_PROTECTED:
1904         case TCM_CHECK_CONDITION_ABORT_CMD:
1905         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1906         case TCM_CHECK_CONDITION_NOT_READY:
1907                 break;
1908         case TCM_RESERVATION_CONFLICT:
1909                 /*
1910                  * No SENSE Data payload for this case, set SCSI Status
1911                  * and queue the response to $FABRIC_MOD.
1912                  *
1913                  * Uses linux/include/scsi/scsi.h SAM status codes defs
1914                  */
1915                 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1916                 /*
1917                  * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1918                  * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1919                  * CONFLICT STATUS.
1920                  *
1921                  * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1922                  */
1923                 if (cmd->se_sess &&
1924                     cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1925                         core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1926                                 cmd->orig_fe_lun, 0x2C,
1927                                 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1928
1929                 ret = cmd->se_tfo->queue_status(cmd);
1930                 if (ret == -EAGAIN || ret == -ENOMEM)
1931                         goto queue_full;
1932                 goto check_stop;
1933         default:
1934                 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1935                         cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1936                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1937                 break;
1938         }
1939         /*
1940          * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1941          * make the call to transport_send_check_condition_and_sense()
1942          * directly.  Otherwise expect the fabric to make the call to
1943          * transport_send_check_condition_and_sense() after handling
1944          * possible unsoliticied write data payloads.
1945          */
1946         ret = transport_send_check_condition_and_sense(cmd,
1947                         cmd->scsi_sense_reason, 0);
1948         if (ret == -EAGAIN || ret == -ENOMEM)
1949                 goto queue_full;
1950
1951 check_stop:
1952         transport_lun_remove_cmd(cmd);
1953         if (!transport_cmd_check_stop_to_fabric(cmd))
1954                 ;
1955         return;
1956
1957 queue_full:
1958         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1959         transport_handle_queue_full(cmd, cmd->se_dev);
1960 }
1961 EXPORT_SYMBOL(transport_generic_request_failure);
1962
1963 /*
1964  * Called from Fabric Module context from transport_execute_tasks()
1965  *
1966  * The return of this function determins if the tasks from struct se_cmd
1967  * get added to the execution queue in transport_execute_tasks(),
1968  * or are added to the delayed or ordered lists here.
1969  */
1970 static inline int transport_execute_task_attr(struct se_cmd *cmd)
1971 {
1972         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1973                 return 1;
1974         /*
1975          * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1976          * to allow the passed struct se_cmd list of tasks to the front of the list.
1977          */
1978          if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1979                 pr_debug("Added HEAD_OF_QUEUE for CDB:"
1980                         " 0x%02x, se_ordered_id: %u\n",
1981                         cmd->t_task_cdb[0],
1982                         cmd->se_ordered_id);
1983                 return 1;
1984         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1985                 atomic_inc(&cmd->se_dev->dev_ordered_sync);
1986                 smp_mb__after_atomic_inc();
1987
1988                 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
1989                                 " list, se_ordered_id: %u\n",
1990                                 cmd->t_task_cdb[0],
1991                                 cmd->se_ordered_id);
1992                 /*
1993                  * Add ORDERED command to tail of execution queue if
1994                  * no other older commands exist that need to be
1995                  * completed first.
1996                  */
1997                 if (!atomic_read(&cmd->se_dev->simple_cmds))
1998                         return 1;
1999         } else {
2000                 /*
2001                  * For SIMPLE and UNTAGGED Task Attribute commands
2002                  */
2003                 atomic_inc(&cmd->se_dev->simple_cmds);
2004                 smp_mb__after_atomic_inc();
2005         }
2006         /*
2007          * Otherwise if one or more outstanding ORDERED task attribute exist,
2008          * add the dormant task(s) built for the passed struct se_cmd to the
2009          * execution queue and become in Active state for this struct se_device.
2010          */
2011         if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
2012                 /*
2013                  * Otherwise, add cmd w/ tasks to delayed cmd queue that
2014                  * will be drained upon completion of HEAD_OF_QUEUE task.
2015                  */
2016                 spin_lock(&cmd->se_dev->delayed_cmd_lock);
2017                 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
2018                 list_add_tail(&cmd->se_delayed_node,
2019                                 &cmd->se_dev->delayed_cmd_list);
2020                 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
2021
2022                 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2023                         " delayed CMD list, se_ordered_id: %u\n",
2024                         cmd->t_task_cdb[0], cmd->sam_task_attr,
2025                         cmd->se_ordered_id);
2026                 /*
2027                  * Return zero to let transport_execute_tasks() know
2028                  * not to add the delayed tasks to the execution list.
2029                  */
2030                 return 0;
2031         }
2032         /*
2033          * Otherwise, no ORDERED task attributes exist..
2034          */
2035         return 1;
2036 }
2037
2038 /*
2039  * Called from fabric module context in transport_generic_new_cmd() and
2040  * transport_generic_process_write()
2041  */
2042 static void transport_execute_tasks(struct se_cmd *cmd)
2043 {
2044         int add_tasks;
2045         struct se_device *se_dev = cmd->se_dev;
2046         /*
2047          * Call transport_cmd_check_stop() to see if a fabric exception
2048          * has occurred that prevents execution.
2049          */
2050         if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
2051                 /*
2052                  * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2053                  * attribute for the tasks of the received struct se_cmd CDB
2054                  */
2055                 add_tasks = transport_execute_task_attr(cmd);
2056                 if (add_tasks) {
2057                         __transport_execute_tasks(se_dev, cmd);
2058                         return;
2059                 }
2060         }
2061         __transport_execute_tasks(se_dev, NULL);
2062 }
2063
2064 static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd)
2065 {
2066         int error;
2067         struct se_cmd *cmd = NULL;
2068         unsigned long flags;
2069
2070 check_depth:
2071         spin_lock_irq(&dev->execute_task_lock);
2072         if (new_cmd != NULL)
2073                 __target_add_to_execute_list(new_cmd);
2074
2075         if (list_empty(&dev->execute_list)) {
2076                 spin_unlock_irq(&dev->execute_task_lock);
2077                 return 0;
2078         }
2079         cmd = list_first_entry(&dev->execute_list, struct se_cmd, execute_list);
2080         __target_remove_from_execute_list(cmd);
2081         spin_unlock_irq(&dev->execute_task_lock);
2082
2083         spin_lock_irqsave(&cmd->t_state_lock, flags);
2084         cmd->transport_state |= CMD_T_BUSY;
2085         cmd->transport_state |= CMD_T_SENT;
2086
2087         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2088
2089         if (cmd->execute_cmd)
2090                 error = cmd->execute_cmd(cmd);
2091         else {
2092                 error = dev->transport->execute_cmd(cmd, cmd->t_data_sg,
2093                                 cmd->t_data_nents, cmd->data_direction);
2094         }
2095
2096         if (error != 0) {
2097                 spin_lock_irqsave(&cmd->t_state_lock, flags);
2098                 cmd->transport_state &= ~CMD_T_BUSY;
2099                 cmd->transport_state &= ~CMD_T_SENT;
2100                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2101
2102                 transport_generic_request_failure(cmd);
2103         }
2104
2105         new_cmd = NULL;
2106         goto check_depth;
2107
2108         return 0;
2109 }
2110
2111 /*
2112  * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2113  */
2114 static int transport_get_sense_data(struct se_cmd *cmd)
2115 {
2116         unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2117         struct se_device *dev = cmd->se_dev;
2118         unsigned long flags;
2119         u32 offset = 0;
2120
2121         WARN_ON(!cmd->se_lun);
2122
2123         if (!dev)
2124                 return 0;
2125
2126         spin_lock_irqsave(&cmd->t_state_lock, flags);
2127         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2128                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2129                 return 0;
2130         }
2131
2132         if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2133                 goto out;
2134
2135         if (!dev->transport->get_sense_buffer) {
2136                 pr_err("dev->transport->get_sense_buffer is NULL\n");
2137                 goto out;
2138         }
2139
2140         sense_buffer = dev->transport->get_sense_buffer(cmd);
2141         if (!sense_buffer) {
2142                 pr_err("ITT 0x%08x cmd %p: Unable to locate"
2143                         " sense buffer for task with sense\n",
2144                         cmd->se_tfo->get_task_tag(cmd), cmd);
2145                 goto out;
2146         }
2147
2148         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2149
2150         offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
2151
2152         memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER);
2153
2154         /* Automatically padded */
2155         cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
2156
2157         pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
2158                 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
2159         return 0;
2160
2161 out:
2162         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2163         return -1;
2164 }
2165
2166 static inline long long transport_dev_end_lba(struct se_device *dev)
2167 {
2168         return dev->transport->get_blocks(dev) + 1;
2169 }
2170
2171 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2172 {
2173         struct se_device *dev = cmd->se_dev;
2174         u32 sectors;
2175
2176         if (dev->transport->get_device_type(dev) != TYPE_DISK)
2177                 return 0;
2178
2179         sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2180
2181         if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2182                 pr_err("LBA: %llu Sectors: %u exceeds"
2183                         " transport_dev_end_lba(): %llu\n",
2184                         cmd->t_task_lba, sectors,
2185                         transport_dev_end_lba(dev));
2186                 return -EINVAL;
2187         }
2188
2189         return 0;
2190 }
2191
2192 /*
2193  * Called from I/O completion to determine which dormant/delayed
2194  * and ordered cmds need to have their tasks added to the execution queue.
2195  */
2196 static void transport_complete_task_attr(struct se_cmd *cmd)
2197 {
2198         struct se_device *dev = cmd->se_dev;
2199         struct se_cmd *cmd_p, *cmd_tmp;
2200         int new_active_tasks = 0;
2201
2202         if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
2203                 atomic_dec(&dev->simple_cmds);
2204                 smp_mb__after_atomic_dec();
2205                 dev->dev_cur_ordered_id++;
2206                 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
2207                         " SIMPLE: %u\n", dev->dev_cur_ordered_id,
2208                         cmd->se_ordered_id);
2209         } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
2210                 dev->dev_cur_ordered_id++;
2211                 pr_debug("Incremented dev_cur_ordered_id: %u for"
2212                         " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
2213                         cmd->se_ordered_id);
2214         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
2215                 atomic_dec(&dev->dev_ordered_sync);
2216                 smp_mb__after_atomic_dec();
2217
2218                 dev->dev_cur_ordered_id++;
2219                 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
2220                         " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
2221         }
2222         /*
2223          * Process all commands up to the last received
2224          * ORDERED task attribute which requires another blocking
2225          * boundary
2226          */
2227         spin_lock(&dev->delayed_cmd_lock);
2228         list_for_each_entry_safe(cmd_p, cmd_tmp,
2229                         &dev->delayed_cmd_list, se_delayed_node) {
2230
2231                 list_del(&cmd_p->se_delayed_node);
2232                 spin_unlock(&dev->delayed_cmd_lock);
2233
2234                 pr_debug("Calling add_tasks() for"
2235                         " cmd_p: 0x%02x Task Attr: 0x%02x"
2236                         " Dormant -> Active, se_ordered_id: %u\n",
2237                         cmd_p->t_task_cdb[0],
2238                         cmd_p->sam_task_attr, cmd_p->se_ordered_id);
2239
2240                 target_add_to_execute_list(cmd_p);
2241                 new_active_tasks++;
2242
2243                 spin_lock(&dev->delayed_cmd_lock);
2244                 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
2245                         break;
2246         }
2247         spin_unlock(&dev->delayed_cmd_lock);
2248         /*
2249          * If new tasks have become active, wake up the transport thread
2250          * to do the processing of the Active tasks.
2251          */
2252         if (new_active_tasks != 0)
2253                 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
2254 }
2255
2256 static void transport_complete_qf(struct se_cmd *cmd)
2257 {
2258         int ret = 0;
2259
2260         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2261                 transport_complete_task_attr(cmd);
2262
2263         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2264                 ret = cmd->se_tfo->queue_status(cmd);
2265                 if (ret)
2266                         goto out;
2267         }
2268
2269         switch (cmd->data_direction) {
2270         case DMA_FROM_DEVICE:
2271                 ret = cmd->se_tfo->queue_data_in(cmd);
2272                 break;
2273         case DMA_TO_DEVICE:
2274                 if (cmd->t_bidi_data_sg) {
2275                         ret = cmd->se_tfo->queue_data_in(cmd);
2276                         if (ret < 0)
2277                                 break;
2278                 }
2279                 /* Fall through for DMA_TO_DEVICE */
2280         case DMA_NONE:
2281                 ret = cmd->se_tfo->queue_status(cmd);
2282                 break;
2283         default:
2284                 break;
2285         }
2286
2287 out:
2288         if (ret < 0) {
2289                 transport_handle_queue_full(cmd, cmd->se_dev);
2290                 return;
2291         }
2292         transport_lun_remove_cmd(cmd);
2293         transport_cmd_check_stop_to_fabric(cmd);
2294 }
2295
2296 static void transport_handle_queue_full(
2297         struct se_cmd *cmd,
2298         struct se_device *dev)
2299 {
2300         spin_lock_irq(&dev->qf_cmd_lock);
2301         list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
2302         atomic_inc(&dev->dev_qf_count);
2303         smp_mb__after_atomic_inc();
2304         spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2305
2306         schedule_work(&cmd->se_dev->qf_work_queue);
2307 }
2308
2309 static void target_complete_ok_work(struct work_struct *work)
2310 {
2311         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2312         int reason = 0, ret;
2313
2314         /*
2315          * Check if we need to move delayed/dormant tasks from cmds on the
2316          * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2317          * Attribute.
2318          */
2319         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2320                 transport_complete_task_attr(cmd);
2321         /*
2322          * Check to schedule QUEUE_FULL work, or execute an existing
2323          * cmd->transport_qf_callback()
2324          */
2325         if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2326                 schedule_work(&cmd->se_dev->qf_work_queue);
2327
2328         /*
2329          * Check if we need to retrieve a sense buffer from
2330          * the struct se_cmd in question.
2331          */
2332         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2333                 if (transport_get_sense_data(cmd) < 0)
2334                         reason = TCM_NON_EXISTENT_LUN;
2335
2336                 if (cmd->scsi_status) {
2337                         ret = transport_send_check_condition_and_sense(
2338                                         cmd, reason, 1);
2339                         if (ret == -EAGAIN || ret == -ENOMEM)
2340                                 goto queue_full;
2341
2342                         transport_lun_remove_cmd(cmd);
2343                         transport_cmd_check_stop_to_fabric(cmd);
2344                         return;
2345                 }
2346         }
2347         /*
2348          * Check for a callback, used by amongst other things
2349          * XDWRITE_READ_10 emulation.
2350          */
2351         if (cmd->transport_complete_callback)
2352                 cmd->transport_complete_callback(cmd);
2353
2354         switch (cmd->data_direction) {
2355         case DMA_FROM_DEVICE:
2356                 spin_lock(&cmd->se_lun->lun_sep_lock);
2357                 if (cmd->se_lun->lun_sep) {
2358                         cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2359                                         cmd->data_length;
2360                 }
2361                 spin_unlock(&cmd->se_lun->lun_sep_lock);
2362
2363                 ret = cmd->se_tfo->queue_data_in(cmd);
2364                 if (ret == -EAGAIN || ret == -ENOMEM)
2365                         goto queue_full;
2366                 break;
2367         case DMA_TO_DEVICE:
2368                 spin_lock(&cmd->se_lun->lun_sep_lock);
2369                 if (cmd->se_lun->lun_sep) {
2370                         cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
2371                                 cmd->data_length;
2372                 }
2373                 spin_unlock(&cmd->se_lun->lun_sep_lock);
2374                 /*
2375                  * Check if we need to send READ payload for BIDI-COMMAND
2376                  */
2377                 if (cmd->t_bidi_data_sg) {
2378                         spin_lock(&cmd->se_lun->lun_sep_lock);
2379                         if (cmd->se_lun->lun_sep) {
2380                                 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2381                                         cmd->data_length;
2382                         }
2383                         spin_unlock(&cmd->se_lun->lun_sep_lock);
2384                         ret = cmd->se_tfo->queue_data_in(cmd);
2385                         if (ret == -EAGAIN || ret == -ENOMEM)
2386                                 goto queue_full;
2387                         break;
2388                 }
2389                 /* Fall through for DMA_TO_DEVICE */
2390         case DMA_NONE:
2391                 ret = cmd->se_tfo->queue_status(cmd);
2392                 if (ret == -EAGAIN || ret == -ENOMEM)
2393                         goto queue_full;
2394                 break;
2395         default:
2396                 break;
2397         }
2398
2399         transport_lun_remove_cmd(cmd);
2400         transport_cmd_check_stop_to_fabric(cmd);
2401         return;
2402
2403 queue_full:
2404         pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2405                 " data_direction: %d\n", cmd, cmd->data_direction);
2406         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2407         transport_handle_queue_full(cmd, cmd->se_dev);
2408 }
2409
2410 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
2411 {
2412         struct scatterlist *sg;
2413         int count;
2414
2415         for_each_sg(sgl, sg, nents, count)
2416                 __free_page(sg_page(sg));
2417
2418         kfree(sgl);
2419 }
2420
2421 static inline void transport_free_pages(struct se_cmd *cmd)
2422 {
2423         if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
2424                 return;
2425
2426         transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2427         cmd->t_data_sg = NULL;
2428         cmd->t_data_nents = 0;
2429
2430         transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2431         cmd->t_bidi_data_sg = NULL;
2432         cmd->t_bidi_data_nents = 0;
2433 }
2434
2435 /**
2436  * transport_release_cmd - free a command
2437  * @cmd:       command to free
2438  *
2439  * This routine unconditionally frees a command, and reference counting
2440  * or list removal must be done in the caller.
2441  */
2442 static void transport_release_cmd(struct se_cmd *cmd)
2443 {
2444         BUG_ON(!cmd->se_tfo);
2445
2446         if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2447                 core_tmr_release_req(cmd->se_tmr_req);
2448         if (cmd->t_task_cdb != cmd->__t_task_cdb)
2449                 kfree(cmd->t_task_cdb);
2450         /*
2451          * If this cmd has been setup with target_get_sess_cmd(), drop
2452          * the kref and call ->release_cmd() in kref callback.
2453          */
2454          if (cmd->check_release != 0) {
2455                 target_put_sess_cmd(cmd->se_sess, cmd);
2456                 return;
2457         }
2458         cmd->se_tfo->release_cmd(cmd);
2459 }
2460
2461 /**
2462  * transport_put_cmd - release a reference to a command
2463  * @cmd:       command to release
2464  *
2465  * This routine releases our reference to the command and frees it if possible.
2466  */
2467 static void transport_put_cmd(struct se_cmd *cmd)
2468 {
2469         unsigned long flags;
2470
2471         spin_lock_irqsave(&cmd->t_state_lock, flags);
2472         if (atomic_read(&cmd->t_fe_count)) {
2473                 if (!atomic_dec_and_test(&cmd->t_fe_count))
2474                         goto out_busy;
2475         }
2476
2477         if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
2478                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2479                 target_remove_from_state_list(cmd);
2480         }
2481         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2482
2483         transport_free_pages(cmd);
2484         transport_release_cmd(cmd);
2485         return;
2486 out_busy:
2487         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2488 }
2489
2490 /*
2491  * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
2492  * allocating in the core.
2493  * @cmd:  Associated se_cmd descriptor
2494  * @mem:  SGL style memory for TCM WRITE / READ
2495  * @sg_mem_num: Number of SGL elements
2496  * @mem_bidi_in: SGL style memory for TCM BIDI READ
2497  * @sg_mem_bidi_num: Number of BIDI READ SGL elements
2498  *
2499  * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2500  * of parameters.
2501  */
2502 int transport_generic_map_mem_to_cmd(
2503         struct se_cmd *cmd,
2504         struct scatterlist *sgl,
2505         u32 sgl_count,
2506         struct scatterlist *sgl_bidi,
2507         u32 sgl_bidi_count)
2508 {
2509         if (!sgl || !sgl_count)
2510                 return 0;
2511
2512         /*
2513          * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2514          * scatterlists already have been set to follow what the fabric
2515          * passes for the original expected data transfer length.
2516          */
2517         if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
2518                 pr_warn("Rejecting SCSI DATA overflow for fabric using"
2519                         " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2520                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2521                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2522                 return -EINVAL;
2523         }
2524
2525         cmd->t_data_sg = sgl;
2526         cmd->t_data_nents = sgl_count;
2527
2528         if (sgl_bidi && sgl_bidi_count) {
2529                 cmd->t_bidi_data_sg = sgl_bidi;
2530                 cmd->t_bidi_data_nents = sgl_bidi_count;
2531         }
2532         cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
2533         return 0;
2534 }
2535 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
2536
2537 void *transport_kmap_data_sg(struct se_cmd *cmd)
2538 {
2539         struct scatterlist *sg = cmd->t_data_sg;
2540         struct page **pages;
2541         int i;
2542
2543         BUG_ON(!sg);
2544         /*
2545          * We need to take into account a possible offset here for fabrics like
2546          * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2547          * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2548          */
2549         if (!cmd->t_data_nents)
2550                 return NULL;
2551         else if (cmd->t_data_nents == 1)
2552                 return kmap(sg_page(sg)) + sg->offset;
2553
2554         /* >1 page. use vmap */
2555         pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2556         if (!pages)
2557                 return NULL;
2558
2559         /* convert sg[] to pages[] */
2560         for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2561                 pages[i] = sg_page(sg);
2562         }
2563
2564         cmd->t_data_vmap = vmap(pages, cmd->t_data_nents,  VM_MAP, PAGE_KERNEL);
2565         kfree(pages);
2566         if (!cmd->t_data_vmap)
2567                 return NULL;
2568
2569         return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2570 }
2571 EXPORT_SYMBOL(transport_kmap_data_sg);
2572
2573 void transport_kunmap_data_sg(struct se_cmd *cmd)
2574 {
2575         if (!cmd->t_data_nents) {
2576                 return;
2577         } else if (cmd->t_data_nents == 1) {
2578                 kunmap(sg_page(cmd->t_data_sg));
2579                 return;
2580         }
2581
2582         vunmap(cmd->t_data_vmap);
2583         cmd->t_data_vmap = NULL;
2584 }
2585 EXPORT_SYMBOL(transport_kunmap_data_sg);
2586
2587 static int
2588 transport_generic_get_mem(struct se_cmd *cmd)
2589 {
2590         u32 length = cmd->data_length;
2591         unsigned int nents;
2592         struct page *page;
2593         gfp_t zero_flag;
2594         int i = 0;
2595
2596         nents = DIV_ROUND_UP(length, PAGE_SIZE);
2597         cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2598         if (!cmd->t_data_sg)
2599                 return -ENOMEM;
2600
2601         cmd->t_data_nents = nents;
2602         sg_init_table(cmd->t_data_sg, nents);
2603
2604         zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
2605
2606         while (length) {
2607                 u32 page_len = min_t(u32, length, PAGE_SIZE);
2608                 page = alloc_page(GFP_KERNEL | zero_flag);
2609                 if (!page)
2610                         goto out;
2611
2612                 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2613                 length -= page_len;
2614                 i++;
2615         }
2616         return 0;
2617
2618 out:
2619         while (i >= 0) {
2620                 __free_page(sg_page(&cmd->t_data_sg[i]));
2621                 i--;
2622         }
2623         kfree(cmd->t_data_sg);
2624         cmd->t_data_sg = NULL;
2625         return -ENOMEM;
2626 }
2627
2628 /*
2629  * Allocate any required resources to execute the command.  For writes we
2630  * might not have the payload yet, so notify the fabric via a call to
2631  * ->write_pending instead. Otherwise place it on the execution queue.
2632  */
2633 int transport_generic_new_cmd(struct se_cmd *cmd)
2634 {
2635         struct se_device *dev = cmd->se_dev;
2636         int ret = 0;
2637
2638         /*
2639          * Determine is the TCM fabric module has already allocated physical
2640          * memory, and is directly calling transport_generic_map_mem_to_cmd()
2641          * beforehand.
2642          */
2643         if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2644             cmd->data_length) {
2645                 ret = transport_generic_get_mem(cmd);
2646                 if (ret < 0)
2647                         goto out_fail;
2648         }
2649
2650         /* Workaround for handling zero-length control CDBs */
2651         if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->data_length) {
2652                 spin_lock_irq(&cmd->t_state_lock);
2653                 cmd->t_state = TRANSPORT_COMPLETE;
2654                 cmd->transport_state |= CMD_T_ACTIVE;
2655                 spin_unlock_irq(&cmd->t_state_lock);
2656
2657                 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
2658                         u8 ua_asc = 0, ua_ascq = 0;
2659
2660                         core_scsi3_ua_clear_for_request_sense(cmd,
2661                                         &ua_asc, &ua_ascq);
2662                 }
2663
2664                 INIT_WORK(&cmd->work, target_complete_ok_work);
2665                 queue_work(target_completion_wq, &cmd->work);
2666                 return 0;
2667         }
2668
2669         if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
2670                 struct se_dev_attrib *attr = &dev->se_sub_dev->se_dev_attrib;
2671
2672                 if (transport_cmd_get_valid_sectors(cmd) < 0)
2673                         return -EINVAL;
2674
2675                 BUG_ON(cmd->data_length % attr->block_size);
2676                 BUG_ON(DIV_ROUND_UP(cmd->data_length, attr->block_size) >
2677                         attr->hw_max_sectors);
2678         }
2679
2680         atomic_inc(&cmd->t_fe_count);
2681
2682         /*
2683          * For WRITEs, let the fabric know its buffer is ready.
2684          *
2685          * The command will be added to the execution queue after its write
2686          * data has arrived.
2687          */
2688         if (cmd->data_direction == DMA_TO_DEVICE) {
2689                 target_add_to_state_list(cmd);
2690                 return transport_generic_write_pending(cmd);
2691         }
2692         /*
2693          * Everything else but a WRITE, add the command to the execution queue.
2694          */
2695         transport_execute_tasks(cmd);
2696         return 0;
2697
2698 out_fail:
2699         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2700         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2701         return -EINVAL;
2702 }
2703 EXPORT_SYMBOL(transport_generic_new_cmd);
2704
2705 /*      transport_generic_process_write():
2706  *
2707  *
2708  */
2709 void transport_generic_process_write(struct se_cmd *cmd)
2710 {
2711         transport_execute_tasks(cmd);
2712 }
2713 EXPORT_SYMBOL(transport_generic_process_write);
2714
2715 static void transport_write_pending_qf(struct se_cmd *cmd)
2716 {
2717         int ret;
2718
2719         ret = cmd->se_tfo->write_pending(cmd);
2720         if (ret == -EAGAIN || ret == -ENOMEM) {
2721                 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2722                          cmd);
2723                 transport_handle_queue_full(cmd, cmd->se_dev);
2724         }
2725 }
2726
2727 static int transport_generic_write_pending(struct se_cmd *cmd)
2728 {
2729         unsigned long flags;
2730         int ret;
2731
2732         spin_lock_irqsave(&cmd->t_state_lock, flags);
2733         cmd->t_state = TRANSPORT_WRITE_PENDING;
2734         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2735
2736         /*
2737          * Clear the se_cmd for WRITE_PENDING status in order to set
2738          * CMD_T_ACTIVE so that transport_generic_handle_data can be called
2739          * from HW target mode interrupt code.  This is safe to be called
2740          * with transport_off=1 before the cmd->se_tfo->write_pending
2741          * because the se_cmd->se_lun pointer is not being cleared.
2742          */
2743         transport_cmd_check_stop(cmd, 1, 0);
2744
2745         /*
2746          * Call the fabric write_pending function here to let the
2747          * frontend know that WRITE buffers are ready.
2748          */
2749         ret = cmd->se_tfo->write_pending(cmd);
2750         if (ret == -EAGAIN || ret == -ENOMEM)
2751                 goto queue_full;
2752         else if (ret < 0)
2753                 return ret;
2754
2755         return 1;
2756
2757 queue_full:
2758         pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2759         cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2760         transport_handle_queue_full(cmd, cmd->se_dev);
2761         return 0;
2762 }
2763
2764 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2765 {
2766         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2767                 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2768                          transport_wait_for_tasks(cmd);
2769
2770                 transport_release_cmd(cmd);
2771         } else {
2772                 if (wait_for_tasks)
2773                         transport_wait_for_tasks(cmd);
2774
2775                 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2776
2777                 if (cmd->se_lun)
2778                         transport_lun_remove_cmd(cmd);
2779
2780                 transport_put_cmd(cmd);
2781         }
2782 }
2783 EXPORT_SYMBOL(transport_generic_free_cmd);
2784
2785 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2786  * @se_sess:    session to reference
2787  * @se_cmd:     command descriptor to add
2788  * @ack_kref:   Signal that fabric will perform an ack target_put_sess_cmd()
2789  */
2790 void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2791                         bool ack_kref)
2792 {
2793         unsigned long flags;
2794
2795         kref_init(&se_cmd->cmd_kref);
2796         /*
2797          * Add a second kref if the fabric caller is expecting to handle
2798          * fabric acknowledgement that requires two target_put_sess_cmd()
2799          * invocations before se_cmd descriptor release.
2800          */
2801         if (ack_kref == true) {
2802                 kref_get(&se_cmd->cmd_kref);
2803                 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2804         }
2805
2806         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2807         list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2808         se_cmd->check_release = 1;
2809         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2810 }
2811 EXPORT_SYMBOL(target_get_sess_cmd);
2812
2813 static void target_release_cmd_kref(struct kref *kref)
2814 {
2815         struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2816         struct se_session *se_sess = se_cmd->se_sess;
2817         unsigned long flags;
2818
2819         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2820         if (list_empty(&se_cmd->se_cmd_list)) {
2821                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2822                 se_cmd->se_tfo->release_cmd(se_cmd);
2823                 return;
2824         }
2825         if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2826                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2827                 complete(&se_cmd->cmd_wait_comp);
2828                 return;
2829         }
2830         list_del(&se_cmd->se_cmd_list);
2831         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2832
2833         se_cmd->se_tfo->release_cmd(se_cmd);
2834 }
2835
2836 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2837  * @se_sess:    session to reference
2838  * @se_cmd:     command descriptor to drop
2839  */
2840 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2841 {
2842         return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
2843 }
2844 EXPORT_SYMBOL(target_put_sess_cmd);
2845
2846 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
2847  * @se_sess:    session to split
2848  */
2849 void target_splice_sess_cmd_list(struct se_session *se_sess)
2850 {
2851         struct se_cmd *se_cmd;
2852         unsigned long flags;
2853
2854         WARN_ON(!list_empty(&se_sess->sess_wait_list));
2855         INIT_LIST_HEAD(&se_sess->sess_wait_list);
2856
2857         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2858         se_sess->sess_tearing_down = 1;
2859
2860         list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
2861
2862         list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
2863                 se_cmd->cmd_wait_set = 1;
2864
2865         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2866 }
2867 EXPORT_SYMBOL(target_splice_sess_cmd_list);
2868
2869 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2870  * @se_sess:    session to wait for active I/O
2871  * @wait_for_tasks:     Make extra transport_wait_for_tasks call
2872  */
2873 void target_wait_for_sess_cmds(
2874         struct se_session *se_sess,
2875         int wait_for_tasks)
2876 {
2877         struct se_cmd *se_cmd, *tmp_cmd;
2878         bool rc = false;
2879
2880         list_for_each_entry_safe(se_cmd, tmp_cmd,
2881                                 &se_sess->sess_wait_list, se_cmd_list) {
2882                 list_del(&se_cmd->se_cmd_list);
2883
2884                 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2885                         " %d\n", se_cmd, se_cmd->t_state,
2886                         se_cmd->se_tfo->get_cmd_state(se_cmd));
2887
2888                 if (wait_for_tasks) {
2889                         pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2890                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2891                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
2892
2893                         rc = transport_wait_for_tasks(se_cmd);
2894
2895                         pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2896                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2897                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
2898                 }
2899
2900                 if (!rc) {
2901                         wait_for_completion(&se_cmd->cmd_wait_comp);
2902                         pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2903                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2904                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
2905                 }
2906
2907                 se_cmd->se_tfo->release_cmd(se_cmd);
2908         }
2909 }
2910 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2911
2912 /*      transport_lun_wait_for_tasks():
2913  *
2914  *      Called from ConfigFS context to stop the passed struct se_cmd to allow
2915  *      an struct se_lun to be successfully shutdown.
2916  */
2917 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2918 {
2919         unsigned long flags;
2920         int ret = 0;
2921
2922         /*
2923          * If the frontend has already requested this struct se_cmd to
2924          * be stopped, we can safely ignore this struct se_cmd.
2925          */
2926         spin_lock_irqsave(&cmd->t_state_lock, flags);
2927         if (cmd->transport_state & CMD_T_STOP) {
2928                 cmd->transport_state &= ~CMD_T_LUN_STOP;
2929
2930                 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2931                          cmd->se_tfo->get_task_tag(cmd));
2932                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2933                 transport_cmd_check_stop(cmd, 1, 0);
2934                 return -EPERM;
2935         }
2936         cmd->transport_state |= CMD_T_LUN_FE_STOP;
2937         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2938
2939         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
2940
2941         // XXX: audit task_flags checks.
2942         spin_lock_irqsave(&cmd->t_state_lock, flags);
2943         if ((cmd->transport_state & CMD_T_BUSY) &&
2944             (cmd->transport_state & CMD_T_SENT)) {
2945                 if (!target_stop_cmd(cmd, &flags))
2946                         ret++;
2947                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2948         } else {
2949                 spin_unlock_irqrestore(&cmd->t_state_lock,
2950                                 flags);
2951                 target_remove_from_execute_list(cmd);
2952         }
2953
2954         pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2955                         " %d\n", cmd, ret);
2956         if (!ret) {
2957                 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
2958                                 cmd->se_tfo->get_task_tag(cmd));
2959                 wait_for_completion(&cmd->transport_lun_stop_comp);
2960                 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
2961                                 cmd->se_tfo->get_task_tag(cmd));
2962         }
2963         transport_remove_cmd_from_queue(cmd);
2964
2965         return 0;
2966 }
2967
2968 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2969 {
2970         struct se_cmd *cmd = NULL;
2971         unsigned long lun_flags, cmd_flags;
2972         /*
2973          * Do exception processing and return CHECK_CONDITION status to the
2974          * Initiator Port.
2975          */
2976         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2977         while (!list_empty(&lun->lun_cmd_list)) {
2978                 cmd = list_first_entry(&lun->lun_cmd_list,
2979                        struct se_cmd, se_lun_node);
2980                 list_del_init(&cmd->se_lun_node);
2981
2982                 /*
2983                  * This will notify iscsi_target_transport.c:
2984                  * transport_cmd_check_stop() that a LUN shutdown is in
2985                  * progress for the iscsi_cmd_t.
2986                  */
2987                 spin_lock(&cmd->t_state_lock);
2988                 pr_debug("SE_LUN[%d] - Setting cmd->transport"
2989                         "_lun_stop for  ITT: 0x%08x\n",
2990                         cmd->se_lun->unpacked_lun,
2991                         cmd->se_tfo->get_task_tag(cmd));
2992                 cmd->transport_state |= CMD_T_LUN_STOP;
2993                 spin_unlock(&cmd->t_state_lock);
2994
2995                 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2996
2997                 if (!cmd->se_lun) {
2998                         pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
2999                                 cmd->se_tfo->get_task_tag(cmd),
3000                                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
3001                         BUG();
3002                 }
3003                 /*
3004                  * If the Storage engine still owns the iscsi_cmd_t, determine
3005                  * and/or stop its context.
3006                  */
3007                 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
3008                         "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
3009                         cmd->se_tfo->get_task_tag(cmd));
3010
3011                 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
3012                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3013                         continue;
3014                 }
3015
3016                 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
3017                         "_wait_for_tasks(): SUCCESS\n",
3018                         cmd->se_lun->unpacked_lun,
3019                         cmd->se_tfo->get_task_tag(cmd));
3020
3021                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
3022                 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
3023                         spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
3024                         goto check_cond;
3025                 }
3026                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
3027                 target_remove_from_state_list(cmd);
3028                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
3029
3030                 /*
3031                  * The Storage engine stopped this struct se_cmd before it was
3032                  * send to the fabric frontend for delivery back to the
3033                  * Initiator Node.  Return this SCSI CDB back with an
3034                  * CHECK_CONDITION status.
3035                  */
3036 check_cond:
3037                 transport_send_check_condition_and_sense(cmd,
3038                                 TCM_NON_EXISTENT_LUN, 0);
3039                 /*
3040                  *  If the fabric frontend is waiting for this iscsi_cmd_t to
3041                  * be released, notify the waiting thread now that LU has
3042                  * finished accessing it.
3043                  */
3044                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
3045                 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
3046                         pr_debug("SE_LUN[%d] - Detected FE stop for"
3047                                 " struct se_cmd: %p ITT: 0x%08x\n",
3048                                 lun->unpacked_lun,
3049                                 cmd, cmd->se_tfo->get_task_tag(cmd));
3050
3051                         spin_unlock_irqrestore(&cmd->t_state_lock,
3052                                         cmd_flags);
3053                         transport_cmd_check_stop(cmd, 1, 0);
3054                         complete(&cmd->transport_lun_fe_stop_comp);
3055                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3056                         continue;
3057                 }
3058                 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
3059                         lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
3060
3061                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
3062                 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3063         }
3064         spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
3065 }
3066
3067 static int transport_clear_lun_thread(void *p)
3068 {
3069         struct se_lun *lun = p;
3070
3071         __transport_clear_lun_from_sessions(lun);
3072         complete(&lun->lun_shutdown_comp);
3073
3074         return 0;
3075 }
3076
3077 int transport_clear_lun_from_sessions(struct se_lun *lun)
3078 {
3079         struct task_struct *kt;
3080
3081         kt = kthread_run(transport_clear_lun_thread, lun,
3082                         "tcm_cl_%u", lun->unpacked_lun);
3083         if (IS_ERR(kt)) {
3084                 pr_err("Unable to start clear_lun thread\n");
3085                 return PTR_ERR(kt);
3086         }
3087         wait_for_completion(&lun->lun_shutdown_comp);
3088
3089         return 0;
3090 }
3091
3092 /**
3093  * transport_wait_for_tasks - wait for completion to occur
3094  * @cmd:        command to wait
3095  *
3096  * Called from frontend fabric context to wait for storage engine
3097  * to pause and/or release frontend generated struct se_cmd.
3098  */
3099 bool transport_wait_for_tasks(struct se_cmd *cmd)
3100 {
3101         unsigned long flags;
3102
3103         spin_lock_irqsave(&cmd->t_state_lock, flags);
3104         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
3105             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
3106                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3107                 return false;
3108         }
3109
3110         if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
3111             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
3112                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3113                 return false;
3114         }
3115         /*
3116          * If we are already stopped due to an external event (ie: LUN shutdown)
3117          * sleep until the connection can have the passed struct se_cmd back.
3118          * The cmd->transport_lun_stopped_sem will be upped by
3119          * transport_clear_lun_from_sessions() once the ConfigFS context caller
3120          * has completed its operation on the struct se_cmd.
3121          */
3122         if (cmd->transport_state & CMD_T_LUN_STOP) {
3123                 pr_debug("wait_for_tasks: Stopping"
3124                         " wait_for_completion(&cmd->t_tasktransport_lun_fe"
3125                         "_stop_comp); for ITT: 0x%08x\n",
3126                         cmd->se_tfo->get_task_tag(cmd));
3127                 /*
3128                  * There is a special case for WRITES where a FE exception +
3129                  * LUN shutdown means ConfigFS context is still sleeping on
3130                  * transport_lun_stop_comp in transport_lun_wait_for_tasks().
3131                  * We go ahead and up transport_lun_stop_comp just to be sure
3132                  * here.
3133                  */
3134                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3135                 complete(&cmd->transport_lun_stop_comp);
3136                 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
3137                 spin_lock_irqsave(&cmd->t_state_lock, flags);
3138
3139                 target_remove_from_state_list(cmd);
3140                 /*
3141                  * At this point, the frontend who was the originator of this
3142                  * struct se_cmd, now owns the structure and can be released through
3143                  * normal means below.
3144                  */
3145                 pr_debug("wait_for_tasks: Stopped"
3146                         " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
3147                         "stop_comp); for ITT: 0x%08x\n",
3148                         cmd->se_tfo->get_task_tag(cmd));
3149
3150                 cmd->transport_state &= ~CMD_T_LUN_STOP;
3151         }
3152
3153         if (!(cmd->transport_state & CMD_T_ACTIVE)) {
3154                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3155                 return false;
3156         }
3157
3158         cmd->transport_state |= CMD_T_STOP;
3159
3160         pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
3161                 " i_state: %d, t_state: %d, CMD_T_STOP\n",
3162                 cmd, cmd->se_tfo->get_task_tag(cmd),
3163                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
3164
3165         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3166
3167         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
3168
3169         wait_for_completion(&cmd->t_transport_stop_comp);
3170
3171         spin_lock_irqsave(&cmd->t_state_lock, flags);
3172         cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
3173
3174         pr_debug("wait_for_tasks: Stopped wait_for_compltion("
3175                 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
3176                 cmd->se_tfo->get_task_tag(cmd));
3177
3178         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3179
3180         return true;
3181 }
3182 EXPORT_SYMBOL(transport_wait_for_tasks);
3183
3184 static int transport_get_sense_codes(
3185         struct se_cmd *cmd,
3186         u8 *asc,
3187         u8 *ascq)
3188 {
3189         *asc = cmd->scsi_asc;
3190         *ascq = cmd->scsi_ascq;
3191
3192         return 0;
3193 }
3194
3195 static int transport_set_sense_codes(
3196         struct se_cmd *cmd,
3197         u8 asc,
3198         u8 ascq)
3199 {
3200         cmd->scsi_asc = asc;
3201         cmd->scsi_ascq = ascq;
3202
3203         return 0;
3204 }
3205
3206 int transport_send_check_condition_and_sense(
3207         struct se_cmd *cmd,
3208         u8 reason,
3209         int from_transport)
3210 {
3211         unsigned char *buffer = cmd->sense_buffer;
3212         unsigned long flags;
3213         int offset;
3214         u8 asc = 0, ascq = 0;
3215
3216         spin_lock_irqsave(&cmd->t_state_lock, flags);
3217         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3218                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3219                 return 0;
3220         }
3221         cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
3222         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3223
3224         if (!reason && from_transport)
3225                 goto after_reason;
3226
3227         if (!from_transport)
3228                 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
3229         /*
3230          * Data Segment and SenseLength of the fabric response PDU.
3231          *
3232          * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
3233          * from include/scsi/scsi_cmnd.h
3234          */
3235         offset = cmd->se_tfo->set_fabric_sense_len(cmd,
3236                                 TRANSPORT_SENSE_BUFFER);
3237         /*
3238          * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
3239          * SENSE KEY values from include/scsi/scsi.h
3240          */
3241         switch (reason) {
3242         case TCM_NON_EXISTENT_LUN:
3243                 /* CURRENT ERROR */
3244                 buffer[offset] = 0x70;
3245                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3246                 /* ILLEGAL REQUEST */
3247                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3248                 /* LOGICAL UNIT NOT SUPPORTED */
3249                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
3250                 break;
3251         case TCM_UNSUPPORTED_SCSI_OPCODE:
3252         case TCM_SECTOR_COUNT_TOO_MANY:
3253                 /* CURRENT ERROR */
3254                 buffer[offset] = 0x70;
3255                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3256                 /* ILLEGAL REQUEST */
3257                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3258                 /* INVALID COMMAND OPERATION CODE */
3259                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
3260                 break;
3261         case TCM_UNKNOWN_MODE_PAGE:
3262                 /* CURRENT ERROR */
3263                 buffer[offset] = 0x70;
3264                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3265                 /* ILLEGAL REQUEST */
3266                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3267                 /* INVALID FIELD IN CDB */
3268                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
3269                 break;
3270         case TCM_CHECK_CONDITION_ABORT_CMD:
3271                 /* CURRENT ERROR */
3272                 buffer[offset] = 0x70;
3273                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3274                 /* ABORTED COMMAND */
3275                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
3276                 /* BUS DEVICE RESET FUNCTION OCCURRED */
3277                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
3278                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
3279                 break;
3280         case TCM_INCORRECT_AMOUNT_OF_DATA:
3281                 /* CURRENT ERROR */
3282                 buffer[offset] = 0x70;
3283                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3284                 /* ABORTED COMMAND */
3285                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
3286                 /* WRITE ERROR */
3287                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
3288                 /* NOT ENOUGH UNSOLICITED DATA */
3289                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
3290                 break;
3291         case TCM_INVALID_CDB_FIELD:
3292                 /* CURRENT ERROR */
3293                 buffer[offset] = 0x70;
3294                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3295                 /* ILLEGAL REQUEST */
3296                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3297                 /* INVALID FIELD IN CDB */
3298                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
3299                 break;
3300         case TCM_INVALID_PARAMETER_LIST:
3301                 /* CURRENT ERROR */
3302                 buffer[offset] = 0x70;
3303                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3304                 /* ILLEGAL REQUEST */
3305                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3306                 /* INVALID FIELD IN PARAMETER LIST */
3307                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
3308                 break;
3309         case TCM_UNEXPECTED_UNSOLICITED_DATA:
3310                 /* CURRENT ERROR */
3311                 buffer[offset] = 0x70;
3312                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3313                 /* ABORTED COMMAND */
3314                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
3315                 /* WRITE ERROR */
3316                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
3317                 /* UNEXPECTED_UNSOLICITED_DATA */
3318                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
3319                 break;
3320         case TCM_SERVICE_CRC_ERROR:
3321                 /* CURRENT ERROR */
3322                 buffer[offset] = 0x70;
3323                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3324                 /* ABORTED COMMAND */
3325                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
3326                 /* PROTOCOL SERVICE CRC ERROR */
3327                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
3328                 /* N/A */
3329                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
3330                 break;
3331         case TCM_SNACK_REJECTED:
3332                 /* CURRENT ERROR */
3333                 buffer[offset] = 0x70;
3334                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3335                 /* ABORTED COMMAND */
3336                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
3337                 /* READ ERROR */
3338                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
3339                 /* FAILED RETRANSMISSION REQUEST */
3340                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
3341                 break;
3342         case TCM_WRITE_PROTECTED:
3343                 /* CURRENT ERROR */
3344                 buffer[offset] = 0x70;
3345                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3346                 /* DATA PROTECT */
3347                 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
3348                 /* WRITE PROTECTED */
3349                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
3350                 break;
3351         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
3352                 /* CURRENT ERROR */
3353                 buffer[offset] = 0x70;
3354                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3355                 /* UNIT ATTENTION */
3356                 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
3357                 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
3358                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
3359                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
3360                 break;
3361         case TCM_CHECK_CONDITION_NOT_READY:
3362                 /* CURRENT ERROR */
3363                 buffer[offset] = 0x70;
3364                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3365                 /* Not Ready */
3366                 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
3367                 transport_get_sense_codes(cmd, &asc, &ascq);
3368                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
3369                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
3370                 break;
3371         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
3372         default:
3373                 /* CURRENT ERROR */
3374                 buffer[offset] = 0x70;
3375                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3376                 /* ILLEGAL REQUEST */
3377                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3378                 /* LOGICAL UNIT COMMUNICATION FAILURE */
3379                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
3380                 break;
3381         }
3382         /*
3383          * This code uses linux/include/scsi/scsi.h SAM status codes!
3384          */
3385         cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3386         /*
3387          * Automatically padded, this value is encoded in the fabric's
3388          * data_length response PDU containing the SCSI defined sense data.
3389          */
3390         cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER + offset;
3391
3392 after_reason:
3393         return cmd->se_tfo->queue_status(cmd);
3394 }
3395 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3396
3397 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3398 {
3399         int ret = 0;
3400
3401         if (cmd->transport_state & CMD_T_ABORTED) {
3402                 if (!send_status ||
3403                      (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
3404                         return 1;
3405
3406                 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
3407                         " status for CDB: 0x%02x ITT: 0x%08x\n",
3408                         cmd->t_task_cdb[0],
3409                         cmd->se_tfo->get_task_tag(cmd));
3410
3411                 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
3412                 cmd->se_tfo->queue_status(cmd);
3413                 ret = 1;
3414         }
3415         return ret;
3416 }
3417 EXPORT_SYMBOL(transport_check_aborted_status);
3418
3419 void transport_send_task_abort(struct se_cmd *cmd)
3420 {
3421         unsigned long flags;
3422
3423         spin_lock_irqsave(&cmd->t_state_lock, flags);
3424         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3425                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3426                 return;
3427         }
3428         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3429
3430         /*
3431          * If there are still expected incoming fabric WRITEs, we wait
3432          * until until they have completed before sending a TASK_ABORTED
3433          * response.  This response with TASK_ABORTED status will be
3434          * queued back to fabric module by transport_check_aborted_status().
3435          */
3436         if (cmd->data_direction == DMA_TO_DEVICE) {
3437                 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
3438                         cmd->transport_state |= CMD_T_ABORTED;
3439                         smp_mb__after_atomic_inc();
3440                 }
3441         }
3442         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
3443
3444         pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
3445                 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
3446                 cmd->se_tfo->get_task_tag(cmd));
3447
3448         cmd->se_tfo->queue_status(cmd);
3449 }
3450
3451 static int transport_generic_do_tmr(struct se_cmd *cmd)
3452 {
3453         struct se_device *dev = cmd->se_dev;
3454         struct se_tmr_req *tmr = cmd->se_tmr_req;
3455         int ret;
3456
3457         switch (tmr->function) {
3458         case TMR_ABORT_TASK:
3459                 core_tmr_abort_task(dev, tmr, cmd->se_sess);
3460                 break;
3461         case TMR_ABORT_TASK_SET:
3462         case TMR_CLEAR_ACA:
3463         case TMR_CLEAR_TASK_SET:
3464                 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3465                 break;
3466         case TMR_LUN_RESET:
3467                 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3468                 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3469                                          TMR_FUNCTION_REJECTED;
3470                 break;
3471         case TMR_TARGET_WARM_RESET:
3472                 tmr->response = TMR_FUNCTION_REJECTED;
3473                 break;
3474         case TMR_TARGET_COLD_RESET:
3475                 tmr->response = TMR_FUNCTION_REJECTED;
3476                 break;
3477         default:
3478                 pr_err("Uknown TMR function: 0x%02x.\n",
3479                                 tmr->function);
3480                 tmr->response = TMR_FUNCTION_REJECTED;
3481                 break;
3482         }
3483
3484         cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3485         cmd->se_tfo->queue_tm_rsp(cmd);
3486
3487         transport_cmd_check_stop_to_fabric(cmd);
3488         return 0;
3489 }
3490
3491 /*      transport_processing_thread():
3492  *
3493  *
3494  */
3495 static int transport_processing_thread(void *param)
3496 {
3497         int ret;
3498         struct se_cmd *cmd;
3499         struct se_device *dev = param;
3500
3501         while (!kthread_should_stop()) {
3502                 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
3503                                 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
3504                                 kthread_should_stop());
3505                 if (ret < 0)
3506                         goto out;
3507
3508 get_cmd:
3509                 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
3510                 if (!cmd)
3511                         continue;
3512
3513                 switch (cmd->t_state) {
3514                 case TRANSPORT_NEW_CMD:
3515                         BUG();
3516                         break;
3517                 case TRANSPORT_NEW_CMD_MAP:
3518                         if (!cmd->se_tfo->new_cmd_map) {
3519                                 pr_err("cmd->se_tfo->new_cmd_map is"
3520                                         " NULL for TRANSPORT_NEW_CMD_MAP\n");
3521                                 BUG();
3522                         }
3523                         ret = cmd->se_tfo->new_cmd_map(cmd);
3524                         if (ret < 0) {
3525                                 transport_generic_request_failure(cmd);
3526                                 break;
3527                         }
3528                         ret = transport_generic_new_cmd(cmd);
3529                         if (ret < 0) {
3530                                 transport_generic_request_failure(cmd);
3531                                 break;
3532                         }
3533                         break;
3534                 case TRANSPORT_PROCESS_WRITE:
3535                         transport_generic_process_write(cmd);
3536                         break;
3537                 case TRANSPORT_PROCESS_TMR:
3538                         transport_generic_do_tmr(cmd);
3539                         break;
3540                 case TRANSPORT_COMPLETE_QF_WP:
3541                         transport_write_pending_qf(cmd);
3542                         break;
3543                 case TRANSPORT_COMPLETE_QF_OK:
3544                         transport_complete_qf(cmd);
3545                         break;
3546                 default:
3547                         pr_err("Unknown t_state: %d  for ITT: 0x%08x "
3548                                 "i_state: %d on SE LUN: %u\n",
3549                                 cmd->t_state,
3550                                 cmd->se_tfo->get_task_tag(cmd),
3551                                 cmd->se_tfo->get_cmd_state(cmd),
3552                                 cmd->se_lun->unpacked_lun);
3553                         BUG();
3554                 }
3555
3556                 goto get_cmd;
3557         }
3558
3559 out:
3560         WARN_ON(!list_empty(&dev->state_list));
3561         WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
3562         dev->process_thread = NULL;
3563         return 0;
3564 }